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1/*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/udp.h>
18#include <linux/igmp.h>
19#include <linux/if_ether.h>
20#include <linux/ethtool.h>
21#include <net/arp.h>
22#include <net/ndisc.h>
23#include <net/ip.h>
24#include <net/icmp.h>
25#include <net/rtnetlink.h>
26#include <net/inet_ecn.h>
27#include <net/net_namespace.h>
28#include <net/netns/generic.h>
29#include <net/tun_proto.h>
30#include <net/vxlan.h>
31
32#if IS_ENABLED(CONFIG_IPV6)
33#include <net/ip6_tunnel.h>
34#include <net/ip6_checksum.h>
35#endif
36
37#define VXLAN_VERSION "0.1"
38
39#define PORT_HASH_BITS 8
40#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41#define FDB_AGE_DEFAULT 300 /* 5 min */
42#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44/* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48static unsigned short vxlan_port __read_mostly = 8472;
49module_param_named(udp_port, vxlan_port, ushort, 0444);
50MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52static bool log_ecn_error = true;
53module_param(log_ecn_error, bool, 0644);
54MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56static unsigned int vxlan_net_id;
57static struct rtnl_link_ops vxlan_link_ops;
58
59static const u8 all_zeros_mac[ETH_ALEN + 2];
60
61static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64
65/* per-network namespace private data for this module */
66struct vxlan_net {
67 struct list_head vxlan_list;
68 struct hlist_head sock_list[PORT_HASH_SIZE];
69 spinlock_t sock_lock;
70};
71
72/* Forwarding table entry */
73struct vxlan_fdb {
74 struct hlist_node hlist; /* linked list of entries */
75 struct rcu_head rcu;
76 unsigned long updated; /* jiffies */
77 unsigned long used;
78 struct list_head remotes;
79 u8 eth_addr[ETH_ALEN];
80 u16 state; /* see ndm_state */
81 __be32 vni;
82 u8 flags; /* see ndm_flags */
83};
84
85/* salt for hash table */
86static u32 vxlan_salt __read_mostly;
87
88static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
89{
90 return vs->flags & VXLAN_F_COLLECT_METADATA ||
91 ip_tunnel_collect_metadata();
92}
93
94#if IS_ENABLED(CONFIG_IPV6)
95static inline
96bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
97{
98 if (a->sa.sa_family != b->sa.sa_family)
99 return false;
100 if (a->sa.sa_family == AF_INET6)
101 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
102 else
103 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
104}
105
106static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
107{
108 if (ipa->sa.sa_family == AF_INET6)
109 return ipv6_addr_any(&ipa->sin6.sin6_addr);
110 else
111 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
112}
113
114static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
115{
116 if (ipa->sa.sa_family == AF_INET6)
117 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
118 else
119 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
120}
121
122static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
123{
124 if (nla_len(nla) >= sizeof(struct in6_addr)) {
125 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
126 ip->sa.sa_family = AF_INET6;
127 return 0;
128 } else if (nla_len(nla) >= sizeof(__be32)) {
129 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
130 ip->sa.sa_family = AF_INET;
131 return 0;
132 } else {
133 return -EAFNOSUPPORT;
134 }
135}
136
137static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
138 const union vxlan_addr *ip)
139{
140 if (ip->sa.sa_family == AF_INET6)
141 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
142 else
143 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
144}
145
146#else /* !CONFIG_IPV6 */
147
148static inline
149bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
150{
151 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
152}
153
154static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
155{
156 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
157}
158
159static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
160{
161 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
162}
163
164static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
165{
166 if (nla_len(nla) >= sizeof(struct in6_addr)) {
167 return -EAFNOSUPPORT;
168 } else if (nla_len(nla) >= sizeof(__be32)) {
169 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
170 ip->sa.sa_family = AF_INET;
171 return 0;
172 } else {
173 return -EAFNOSUPPORT;
174 }
175}
176
177static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
178 const union vxlan_addr *ip)
179{
180 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
181}
182#endif
183
184/* Virtual Network hash table head */
185static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
186{
187 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
188}
189
190/* Socket hash table head */
191static inline struct hlist_head *vs_head(struct net *net, __be16 port)
192{
193 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
194
195 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
196}
197
198/* First remote destination for a forwarding entry.
199 * Guaranteed to be non-NULL because remotes are never deleted.
200 */
201static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
202{
203 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
204}
205
206static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
207{
208 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
209}
210
211/* Find VXLAN socket based on network namespace, address family and UDP port
212 * and enabled unshareable flags.
213 */
214static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
215 __be16 port, u32 flags)
216{
217 struct vxlan_sock *vs;
218
219 flags &= VXLAN_F_RCV_FLAGS;
220
221 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
222 if (inet_sk(vs->sock->sk)->inet_sport == port &&
223 vxlan_get_sk_family(vs) == family &&
224 vs->flags == flags)
225 return vs;
226 }
227 return NULL;
228}
229
230static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
231 __be32 vni)
232{
233 struct vxlan_dev_node *node;
234
235 /* For flow based devices, map all packets to VNI 0 */
236 if (vs->flags & VXLAN_F_COLLECT_METADATA)
237 vni = 0;
238
239 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
240 if (node->vxlan->default_dst.remote_vni != vni)
241 continue;
242
243 if (IS_ENABLED(CONFIG_IPV6)) {
244 const struct vxlan_config *cfg = &node->vxlan->cfg;
245
246 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
247 cfg->remote_ifindex != ifindex)
248 continue;
249 }
250
251 return node->vxlan;
252 }
253
254 return NULL;
255}
256
257/* Look up VNI in a per net namespace table */
258static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
259 __be32 vni, sa_family_t family,
260 __be16 port, u32 flags)
261{
262 struct vxlan_sock *vs;
263
264 vs = vxlan_find_sock(net, family, port, flags);
265 if (!vs)
266 return NULL;
267
268 return vxlan_vs_find_vni(vs, ifindex, vni);
269}
270
271/* Fill in neighbour message in skbuff. */
272static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
273 const struct vxlan_fdb *fdb,
274 u32 portid, u32 seq, int type, unsigned int flags,
275 const struct vxlan_rdst *rdst)
276{
277 unsigned long now = jiffies;
278 struct nda_cacheinfo ci;
279 struct nlmsghdr *nlh;
280 struct ndmsg *ndm;
281 bool send_ip, send_eth;
282
283 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
284 if (nlh == NULL)
285 return -EMSGSIZE;
286
287 ndm = nlmsg_data(nlh);
288 memset(ndm, 0, sizeof(*ndm));
289
290 send_eth = send_ip = true;
291
292 if (type == RTM_GETNEIGH) {
293 send_ip = !vxlan_addr_any(&rdst->remote_ip);
294 send_eth = !is_zero_ether_addr(fdb->eth_addr);
295 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
296 } else
297 ndm->ndm_family = AF_BRIDGE;
298 ndm->ndm_state = fdb->state;
299 ndm->ndm_ifindex = vxlan->dev->ifindex;
300 ndm->ndm_flags = fdb->flags;
301 ndm->ndm_type = RTN_UNICAST;
302
303 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304 nla_put_s32(skb, NDA_LINK_NETNSID,
305 peernet2id(dev_net(vxlan->dev), vxlan->net)))
306 goto nla_put_failure;
307
308 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309 goto nla_put_failure;
310
311 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
312 goto nla_put_failure;
313
314 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
315 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
316 goto nla_put_failure;
317 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
318 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
319 goto nla_put_failure;
320 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
321 nla_put_u32(skb, NDA_SRC_VNI,
322 be32_to_cpu(fdb->vni)))
323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326 goto nla_put_failure;
327
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
331 ci.ndm_refcnt = 0;
332
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
335
336 nlmsg_end(skb, nlh);
337 return 0;
338
339nla_put_failure:
340 nlmsg_cancel(skb, nlh);
341 return -EMSGSIZE;
342}
343
344static inline size_t vxlan_nlmsg_size(void)
345{
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353 + nla_total_size(sizeof(struct nda_cacheinfo));
354}
355
356static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
358{
359 struct net *net = dev_net(vxlan->dev);
360 struct sk_buff *skb;
361 int err = -ENOBUFS;
362
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
364 if (skb == NULL)
365 goto errout;
366
367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
368 if (err < 0) {
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
371 kfree_skb(skb);
372 goto errout;
373 }
374
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
376 return;
377errout:
378 if (err < 0)
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
380}
381
382static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
383{
384 struct vxlan_dev *vxlan = netdev_priv(dev);
385 struct vxlan_fdb f = {
386 .state = NUD_STALE,
387 };
388 struct vxlan_rdst remote = {
389 .remote_ip = *ipa, /* goes to NDA_DST */
390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
391 };
392
393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
394}
395
396static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397{
398 struct vxlan_fdb f = {
399 .state = NUD_STALE,
400 };
401 struct vxlan_rdst remote = { };
402
403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404
405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
406}
407
408/* Hash Ethernet address */
409static u32 eth_hash(const unsigned char *addr)
410{
411 u64 value = get_unaligned((u64 *)addr);
412
413 /* only want 6 bytes */
414#ifdef __BIG_ENDIAN
415 value >>= 16;
416#else
417 value <<= 16;
418#endif
419 return hash_64(value, FDB_HASH_BITS);
420}
421
422static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
423{
424 /* use 1 byte of OUI and 3 bytes of NIC */
425 u32 key = get_unaligned((u32 *)(addr + 2));
426
427 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
428}
429
430/* Hash chain to use given mac address */
431static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
432 const u8 *mac, __be32 vni)
433{
434 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
435 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
436 else
437 return &vxlan->fdb_head[eth_hash(mac)];
438}
439
440/* Look up Ethernet address in forwarding table */
441static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
442 const u8 *mac, __be32 vni)
443{
444 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
445 struct vxlan_fdb *f;
446
447 hlist_for_each_entry_rcu(f, head, hlist) {
448 if (ether_addr_equal(mac, f->eth_addr)) {
449 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
450 if (vni == f->vni)
451 return f;
452 } else {
453 return f;
454 }
455 }
456 }
457
458 return NULL;
459}
460
461static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
462 const u8 *mac, __be32 vni)
463{
464 struct vxlan_fdb *f;
465
466 f = __vxlan_find_mac(vxlan, mac, vni);
467 if (f)
468 f->used = jiffies;
469
470 return f;
471}
472
473/* caller should hold vxlan->hash_lock */
474static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
475 union vxlan_addr *ip, __be16 port,
476 __be32 vni, __u32 ifindex)
477{
478 struct vxlan_rdst *rd;
479
480 list_for_each_entry(rd, &f->remotes, list) {
481 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
482 rd->remote_port == port &&
483 rd->remote_vni == vni &&
484 rd->remote_ifindex == ifindex)
485 return rd;
486 }
487
488 return NULL;
489}
490
491/* Replace destination of unicast mac */
492static int vxlan_fdb_replace(struct vxlan_fdb *f,
493 union vxlan_addr *ip, __be16 port, __be32 vni,
494 __u32 ifindex)
495{
496 struct vxlan_rdst *rd;
497
498 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
499 if (rd)
500 return 0;
501
502 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
503 if (!rd)
504 return 0;
505
506 dst_cache_reset(&rd->dst_cache);
507 rd->remote_ip = *ip;
508 rd->remote_port = port;
509 rd->remote_vni = vni;
510 rd->remote_ifindex = ifindex;
511 return 1;
512}
513
514/* Add/update destinations for multicast */
515static int vxlan_fdb_append(struct vxlan_fdb *f,
516 union vxlan_addr *ip, __be16 port, __be32 vni,
517 __u32 ifindex, struct vxlan_rdst **rdp)
518{
519 struct vxlan_rdst *rd;
520
521 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
522 if (rd)
523 return 0;
524
525 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
526 if (rd == NULL)
527 return -ENOBUFS;
528
529 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
530 kfree(rd);
531 return -ENOBUFS;
532 }
533
534 rd->remote_ip = *ip;
535 rd->remote_port = port;
536 rd->remote_vni = vni;
537 rd->remote_ifindex = ifindex;
538
539 list_add_tail_rcu(&rd->list, &f->remotes);
540
541 *rdp = rd;
542 return 1;
543}
544
545static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
546 unsigned int off,
547 struct vxlanhdr *vh, size_t hdrlen,
548 __be32 vni_field,
549 struct gro_remcsum *grc,
550 bool nopartial)
551{
552 size_t start, offset;
553
554 if (skb->remcsum_offload)
555 return vh;
556
557 if (!NAPI_GRO_CB(skb)->csum_valid)
558 return NULL;
559
560 start = vxlan_rco_start(vni_field);
561 offset = start + vxlan_rco_offset(vni_field);
562
563 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
564 start, offset, grc, nopartial);
565
566 skb->remcsum_offload = 1;
567
568 return vh;
569}
570
571static struct sk_buff **vxlan_gro_receive(struct sock *sk,
572 struct sk_buff **head,
573 struct sk_buff *skb)
574{
575 struct sk_buff *p, **pp = NULL;
576 struct vxlanhdr *vh, *vh2;
577 unsigned int hlen, off_vx;
578 int flush = 1;
579 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
580 __be32 flags;
581 struct gro_remcsum grc;
582
583 skb_gro_remcsum_init(&grc);
584
585 off_vx = skb_gro_offset(skb);
586 hlen = off_vx + sizeof(*vh);
587 vh = skb_gro_header_fast(skb, off_vx);
588 if (skb_gro_header_hard(skb, hlen)) {
589 vh = skb_gro_header_slow(skb, hlen, off_vx);
590 if (unlikely(!vh))
591 goto out;
592 }
593
594 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
595
596 flags = vh->vx_flags;
597
598 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
599 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
600 vh->vx_vni, &grc,
601 !!(vs->flags &
602 VXLAN_F_REMCSUM_NOPARTIAL));
603
604 if (!vh)
605 goto out;
606 }
607
608 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
609
610 for (p = *head; p; p = p->next) {
611 if (!NAPI_GRO_CB(p)->same_flow)
612 continue;
613
614 vh2 = (struct vxlanhdr *)(p->data + off_vx);
615 if (vh->vx_flags != vh2->vx_flags ||
616 vh->vx_vni != vh2->vx_vni) {
617 NAPI_GRO_CB(p)->same_flow = 0;
618 continue;
619 }
620 }
621
622 pp = call_gro_receive(eth_gro_receive, head, skb);
623 flush = 0;
624
625out:
626 skb_gro_remcsum_cleanup(skb, &grc);
627 skb->remcsum_offload = 0;
628 NAPI_GRO_CB(skb)->flush |= flush;
629
630 return pp;
631}
632
633static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
634{
635 /* Sets 'skb->inner_mac_header' since we are always called with
636 * 'skb->encapsulation' set.
637 */
638 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
639}
640
641/* Add new entry to forwarding table -- assumes lock held */
642static int vxlan_fdb_create(struct vxlan_dev *vxlan,
643 const u8 *mac, union vxlan_addr *ip,
644 __u16 state, __u16 flags,
645 __be16 port, __be32 src_vni, __be32 vni,
646 __u32 ifindex, __u8 ndm_flags)
647{
648 struct vxlan_rdst *rd = NULL;
649 struct vxlan_fdb *f;
650 int notify = 0;
651 int rc;
652
653 f = __vxlan_find_mac(vxlan, mac, src_vni);
654 if (f) {
655 if (flags & NLM_F_EXCL) {
656 netdev_dbg(vxlan->dev,
657 "lost race to create %pM\n", mac);
658 return -EEXIST;
659 }
660 if (f->state != state) {
661 f->state = state;
662 f->updated = jiffies;
663 notify = 1;
664 }
665 if (f->flags != ndm_flags) {
666 f->flags = ndm_flags;
667 f->updated = jiffies;
668 notify = 1;
669 }
670 if ((flags & NLM_F_REPLACE)) {
671 /* Only change unicasts */
672 if (!(is_multicast_ether_addr(f->eth_addr) ||
673 is_zero_ether_addr(f->eth_addr))) {
674 notify |= vxlan_fdb_replace(f, ip, port, vni,
675 ifindex);
676 } else
677 return -EOPNOTSUPP;
678 }
679 if ((flags & NLM_F_APPEND) &&
680 (is_multicast_ether_addr(f->eth_addr) ||
681 is_zero_ether_addr(f->eth_addr))) {
682 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
683
684 if (rc < 0)
685 return rc;
686 notify |= rc;
687 }
688 } else {
689 if (!(flags & NLM_F_CREATE))
690 return -ENOENT;
691
692 if (vxlan->cfg.addrmax &&
693 vxlan->addrcnt >= vxlan->cfg.addrmax)
694 return -ENOSPC;
695
696 /* Disallow replace to add a multicast entry */
697 if ((flags & NLM_F_REPLACE) &&
698 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
699 return -EOPNOTSUPP;
700
701 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
702 f = kmalloc(sizeof(*f), GFP_ATOMIC);
703 if (!f)
704 return -ENOMEM;
705
706 notify = 1;
707 f->state = state;
708 f->flags = ndm_flags;
709 f->updated = f->used = jiffies;
710 f->vni = src_vni;
711 INIT_LIST_HEAD(&f->remotes);
712 memcpy(f->eth_addr, mac, ETH_ALEN);
713
714 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
715 if (rc < 0) {
716 kfree(f);
717 return rc;
718 }
719
720 ++vxlan->addrcnt;
721 hlist_add_head_rcu(&f->hlist,
722 vxlan_fdb_head(vxlan, mac, src_vni));
723 }
724
725 if (notify) {
726 if (rd == NULL)
727 rd = first_remote_rtnl(f);
728 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
729 }
730
731 return 0;
732}
733
734static void vxlan_fdb_free(struct rcu_head *head)
735{
736 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
737 struct vxlan_rdst *rd, *nd;
738
739 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
740 dst_cache_destroy(&rd->dst_cache);
741 kfree(rd);
742 }
743 kfree(f);
744}
745
746static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
747{
748 netdev_dbg(vxlan->dev,
749 "delete %pM\n", f->eth_addr);
750
751 --vxlan->addrcnt;
752 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
753
754 hlist_del_rcu(&f->hlist);
755 call_rcu(&f->rcu, vxlan_fdb_free);
756}
757
758static void vxlan_dst_free(struct rcu_head *head)
759{
760 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
761
762 dst_cache_destroy(&rd->dst_cache);
763 kfree(rd);
764}
765
766static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
767 struct vxlan_rdst *rd)
768{
769 list_del_rcu(&rd->list);
770 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
771 call_rcu(&rd->rcu, vxlan_dst_free);
772}
773
774static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
775 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
776 __be32 *vni, u32 *ifindex)
777{
778 struct net *net = dev_net(vxlan->dev);
779 int err;
780
781 if (tb[NDA_DST]) {
782 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
783 if (err)
784 return err;
785 } else {
786 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
787 if (remote->sa.sa_family == AF_INET) {
788 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
789 ip->sa.sa_family = AF_INET;
790#if IS_ENABLED(CONFIG_IPV6)
791 } else {
792 ip->sin6.sin6_addr = in6addr_any;
793 ip->sa.sa_family = AF_INET6;
794#endif
795 }
796 }
797
798 if (tb[NDA_PORT]) {
799 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
800 return -EINVAL;
801 *port = nla_get_be16(tb[NDA_PORT]);
802 } else {
803 *port = vxlan->cfg.dst_port;
804 }
805
806 if (tb[NDA_VNI]) {
807 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
808 return -EINVAL;
809 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
810 } else {
811 *vni = vxlan->default_dst.remote_vni;
812 }
813
814 if (tb[NDA_SRC_VNI]) {
815 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
816 return -EINVAL;
817 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
818 } else {
819 *src_vni = vxlan->default_dst.remote_vni;
820 }
821
822 if (tb[NDA_IFINDEX]) {
823 struct net_device *tdev;
824
825 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
826 return -EINVAL;
827 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
828 tdev = __dev_get_by_index(net, *ifindex);
829 if (!tdev)
830 return -EADDRNOTAVAIL;
831 } else {
832 *ifindex = 0;
833 }
834
835 return 0;
836}
837
838/* Add static entry (via netlink) */
839static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
840 struct net_device *dev,
841 const unsigned char *addr, u16 vid, u16 flags)
842{
843 struct vxlan_dev *vxlan = netdev_priv(dev);
844 /* struct net *net = dev_net(vxlan->dev); */
845 union vxlan_addr ip;
846 __be16 port;
847 __be32 src_vni, vni;
848 u32 ifindex;
849 int err;
850
851 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
852 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
853 ndm->ndm_state);
854 return -EINVAL;
855 }
856
857 if (tb[NDA_DST] == NULL)
858 return -EINVAL;
859
860 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
861 if (err)
862 return err;
863
864 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
865 return -EAFNOSUPPORT;
866
867 spin_lock_bh(&vxlan->hash_lock);
868 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
869 port, src_vni, vni, ifindex, ndm->ndm_flags);
870 spin_unlock_bh(&vxlan->hash_lock);
871
872 return err;
873}
874
875static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
876 const unsigned char *addr, union vxlan_addr ip,
877 __be16 port, __be32 src_vni, __be32 vni,
878 u32 ifindex, u16 vid)
879{
880 struct vxlan_fdb *f;
881 struct vxlan_rdst *rd = NULL;
882 int err = -ENOENT;
883
884 f = vxlan_find_mac(vxlan, addr, src_vni);
885 if (!f)
886 return err;
887
888 if (!vxlan_addr_any(&ip)) {
889 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
890 if (!rd)
891 goto out;
892 }
893
894 /* remove a destination if it's not the only one on the list,
895 * otherwise destroy the fdb entry
896 */
897 if (rd && !list_is_singular(&f->remotes)) {
898 vxlan_fdb_dst_destroy(vxlan, f, rd);
899 goto out;
900 }
901
902 vxlan_fdb_destroy(vxlan, f);
903
904out:
905 return 0;
906}
907
908/* Delete entry (via netlink) */
909static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
910 struct net_device *dev,
911 const unsigned char *addr, u16 vid)
912{
913 struct vxlan_dev *vxlan = netdev_priv(dev);
914 union vxlan_addr ip;
915 __be32 src_vni, vni;
916 __be16 port;
917 u32 ifindex;
918 int err;
919
920 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
921 if (err)
922 return err;
923
924 spin_lock_bh(&vxlan->hash_lock);
925 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
926 vid);
927 spin_unlock_bh(&vxlan->hash_lock);
928
929 return err;
930}
931
932/* Dump forwarding table */
933static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
934 struct net_device *dev,
935 struct net_device *filter_dev, int *idx)
936{
937 struct vxlan_dev *vxlan = netdev_priv(dev);
938 unsigned int h;
939 int err = 0;
940
941 for (h = 0; h < FDB_HASH_SIZE; ++h) {
942 struct vxlan_fdb *f;
943
944 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
945 struct vxlan_rdst *rd;
946
947 list_for_each_entry_rcu(rd, &f->remotes, list) {
948 if (*idx < cb->args[2])
949 goto skip;
950
951 err = vxlan_fdb_info(skb, vxlan, f,
952 NETLINK_CB(cb->skb).portid,
953 cb->nlh->nlmsg_seq,
954 RTM_NEWNEIGH,
955 NLM_F_MULTI, rd);
956 if (err < 0)
957 goto out;
958skip:
959 *idx += 1;
960 }
961 }
962 }
963out:
964 return err;
965}
966
967/* Watch incoming packets to learn mapping between Ethernet address
968 * and Tunnel endpoint.
969 * Return true if packet is bogus and should be dropped.
970 */
971static bool vxlan_snoop(struct net_device *dev,
972 union vxlan_addr *src_ip, const u8 *src_mac,
973 u32 src_ifindex, __be32 vni)
974{
975 struct vxlan_dev *vxlan = netdev_priv(dev);
976 struct vxlan_fdb *f;
977 u32 ifindex = 0;
978
979#if IS_ENABLED(CONFIG_IPV6)
980 if (src_ip->sa.sa_family == AF_INET6 &&
981 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
982 ifindex = src_ifindex;
983#endif
984
985 f = vxlan_find_mac(vxlan, src_mac, vni);
986 if (likely(f)) {
987 struct vxlan_rdst *rdst = first_remote_rcu(f);
988
989 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
990 rdst->remote_ifindex == ifindex))
991 return false;
992
993 /* Don't migrate static entries, drop packets */
994 if (f->state & (NUD_PERMANENT | NUD_NOARP))
995 return true;
996
997 if (net_ratelimit())
998 netdev_info(dev,
999 "%pM migrated from %pIS to %pIS\n",
1000 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1001
1002 rdst->remote_ip = *src_ip;
1003 f->updated = jiffies;
1004 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1005 } else {
1006 /* learned new entry */
1007 spin_lock(&vxlan->hash_lock);
1008
1009 /* close off race between vxlan_flush and incoming packets */
1010 if (netif_running(dev))
1011 vxlan_fdb_create(vxlan, src_mac, src_ip,
1012 NUD_REACHABLE,
1013 NLM_F_EXCL|NLM_F_CREATE,
1014 vxlan->cfg.dst_port,
1015 vni,
1016 vxlan->default_dst.remote_vni,
1017 ifindex, NTF_SELF);
1018 spin_unlock(&vxlan->hash_lock);
1019 }
1020
1021 return false;
1022}
1023
1024/* See if multicast group is already in use by other ID */
1025static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1026{
1027 struct vxlan_dev *vxlan;
1028 struct vxlan_sock *sock4;
1029#if IS_ENABLED(CONFIG_IPV6)
1030 struct vxlan_sock *sock6;
1031#endif
1032 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1033
1034 sock4 = rtnl_dereference(dev->vn4_sock);
1035
1036 /* The vxlan_sock is only used by dev, leaving group has
1037 * no effect on other vxlan devices.
1038 */
1039 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1040 return false;
1041#if IS_ENABLED(CONFIG_IPV6)
1042 sock6 = rtnl_dereference(dev->vn6_sock);
1043 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1044 return false;
1045#endif
1046
1047 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1048 if (!netif_running(vxlan->dev) || vxlan == dev)
1049 continue;
1050
1051 if (family == AF_INET &&
1052 rtnl_dereference(vxlan->vn4_sock) != sock4)
1053 continue;
1054#if IS_ENABLED(CONFIG_IPV6)
1055 if (family == AF_INET6 &&
1056 rtnl_dereference(vxlan->vn6_sock) != sock6)
1057 continue;
1058#endif
1059
1060 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1061 &dev->default_dst.remote_ip))
1062 continue;
1063
1064 if (vxlan->default_dst.remote_ifindex !=
1065 dev->default_dst.remote_ifindex)
1066 continue;
1067
1068 return true;
1069 }
1070
1071 return false;
1072}
1073
1074static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1075{
1076 struct vxlan_net *vn;
1077
1078 if (!vs)
1079 return false;
1080 if (!refcount_dec_and_test(&vs->refcnt))
1081 return false;
1082
1083 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1084 spin_lock(&vn->sock_lock);
1085 hlist_del_rcu(&vs->hlist);
1086 udp_tunnel_notify_del_rx_port(vs->sock,
1087 (vs->flags & VXLAN_F_GPE) ?
1088 UDP_TUNNEL_TYPE_VXLAN_GPE :
1089 UDP_TUNNEL_TYPE_VXLAN);
1090 spin_unlock(&vn->sock_lock);
1091
1092 return true;
1093}
1094
1095static void vxlan_sock_release(struct vxlan_dev *vxlan)
1096{
1097 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1098#if IS_ENABLED(CONFIG_IPV6)
1099 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1100
1101 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1102#endif
1103
1104 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1105 synchronize_net();
1106
1107 vxlan_vs_del_dev(vxlan);
1108
1109 if (__vxlan_sock_release_prep(sock4)) {
1110 udp_tunnel_sock_release(sock4->sock);
1111 kfree(sock4);
1112 }
1113
1114#if IS_ENABLED(CONFIG_IPV6)
1115 if (__vxlan_sock_release_prep(sock6)) {
1116 udp_tunnel_sock_release(sock6->sock);
1117 kfree(sock6);
1118 }
1119#endif
1120}
1121
1122/* Update multicast group membership when first VNI on
1123 * multicast address is brought up
1124 */
1125static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1126{
1127 struct sock *sk;
1128 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1129 int ifindex = vxlan->default_dst.remote_ifindex;
1130 int ret = -EINVAL;
1131
1132 if (ip->sa.sa_family == AF_INET) {
1133 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1134 struct ip_mreqn mreq = {
1135 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1136 .imr_ifindex = ifindex,
1137 };
1138
1139 sk = sock4->sock->sk;
1140 lock_sock(sk);
1141 ret = ip_mc_join_group(sk, &mreq);
1142 release_sock(sk);
1143#if IS_ENABLED(CONFIG_IPV6)
1144 } else {
1145 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1146
1147 sk = sock6->sock->sk;
1148 lock_sock(sk);
1149 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1150 &ip->sin6.sin6_addr);
1151 release_sock(sk);
1152#endif
1153 }
1154
1155 return ret;
1156}
1157
1158/* Inverse of vxlan_igmp_join when last VNI is brought down */
1159static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1160{
1161 struct sock *sk;
1162 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1163 int ifindex = vxlan->default_dst.remote_ifindex;
1164 int ret = -EINVAL;
1165
1166 if (ip->sa.sa_family == AF_INET) {
1167 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1168 struct ip_mreqn mreq = {
1169 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1170 .imr_ifindex = ifindex,
1171 };
1172
1173 sk = sock4->sock->sk;
1174 lock_sock(sk);
1175 ret = ip_mc_leave_group(sk, &mreq);
1176 release_sock(sk);
1177#if IS_ENABLED(CONFIG_IPV6)
1178 } else {
1179 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1180
1181 sk = sock6->sock->sk;
1182 lock_sock(sk);
1183 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1184 &ip->sin6.sin6_addr);
1185 release_sock(sk);
1186#endif
1187 }
1188
1189 return ret;
1190}
1191
1192static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1193 struct sk_buff *skb, u32 vxflags)
1194{
1195 size_t start, offset;
1196
1197 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1198 goto out;
1199
1200 start = vxlan_rco_start(unparsed->vx_vni);
1201 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1202
1203 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1204 return false;
1205
1206 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1207 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1208out:
1209 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1210 unparsed->vx_vni &= VXLAN_VNI_MASK;
1211 return true;
1212}
1213
1214static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1215 struct sk_buff *skb, u32 vxflags,
1216 struct vxlan_metadata *md)
1217{
1218 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1219 struct metadata_dst *tun_dst;
1220
1221 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1222 goto out;
1223
1224 md->gbp = ntohs(gbp->policy_id);
1225
1226 tun_dst = (struct metadata_dst *)skb_dst(skb);
1227 if (tun_dst) {
1228 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1229 tun_dst->u.tun_info.options_len = sizeof(*md);
1230 }
1231 if (gbp->dont_learn)
1232 md->gbp |= VXLAN_GBP_DONT_LEARN;
1233
1234 if (gbp->policy_applied)
1235 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1236
1237 /* In flow-based mode, GBP is carried in dst_metadata */
1238 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1239 skb->mark = md->gbp;
1240out:
1241 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1242}
1243
1244static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1245 __be16 *protocol,
1246 struct sk_buff *skb, u32 vxflags)
1247{
1248 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1249
1250 /* Need to have Next Protocol set for interfaces in GPE mode. */
1251 if (!gpe->np_applied)
1252 return false;
1253 /* "The initial version is 0. If a receiver does not support the
1254 * version indicated it MUST drop the packet.
1255 */
1256 if (gpe->version != 0)
1257 return false;
1258 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1259 * processing MUST occur." However, we don't implement OAM
1260 * processing, thus drop the packet.
1261 */
1262 if (gpe->oam_flag)
1263 return false;
1264
1265 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1266 if (!*protocol)
1267 return false;
1268
1269 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1270 return true;
1271}
1272
1273static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1274 struct vxlan_sock *vs,
1275 struct sk_buff *skb, __be32 vni)
1276{
1277 union vxlan_addr saddr;
1278 u32 ifindex = skb->dev->ifindex;
1279
1280 skb_reset_mac_header(skb);
1281 skb->protocol = eth_type_trans(skb, vxlan->dev);
1282 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1283
1284 /* Ignore packet loops (and multicast echo) */
1285 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1286 return false;
1287
1288 /* Get address from the outer IP header */
1289 if (vxlan_get_sk_family(vs) == AF_INET) {
1290 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1291 saddr.sa.sa_family = AF_INET;
1292#if IS_ENABLED(CONFIG_IPV6)
1293 } else {
1294 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1295 saddr.sa.sa_family = AF_INET6;
1296#endif
1297 }
1298
1299 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1300 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1301 return false;
1302
1303 return true;
1304}
1305
1306static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1307 struct sk_buff *skb)
1308{
1309 int err = 0;
1310
1311 if (vxlan_get_sk_family(vs) == AF_INET)
1312 err = IP_ECN_decapsulate(oiph, skb);
1313#if IS_ENABLED(CONFIG_IPV6)
1314 else
1315 err = IP6_ECN_decapsulate(oiph, skb);
1316#endif
1317
1318 if (unlikely(err) && log_ecn_error) {
1319 if (vxlan_get_sk_family(vs) == AF_INET)
1320 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1321 &((struct iphdr *)oiph)->saddr,
1322 ((struct iphdr *)oiph)->tos);
1323 else
1324 net_info_ratelimited("non-ECT from %pI6\n",
1325 &((struct ipv6hdr *)oiph)->saddr);
1326 }
1327 return err <= 1;
1328}
1329
1330/* Callback from net/ipv4/udp.c to receive packets */
1331static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1332{
1333 struct pcpu_sw_netstats *stats;
1334 struct vxlan_dev *vxlan;
1335 struct vxlan_sock *vs;
1336 struct vxlanhdr unparsed;
1337 struct vxlan_metadata _md;
1338 struct vxlan_metadata *md = &_md;
1339 __be16 protocol = htons(ETH_P_TEB);
1340 bool raw_proto = false;
1341 void *oiph;
1342 __be32 vni = 0;
1343
1344 /* Need UDP and VXLAN header to be present */
1345 if (!pskb_may_pull(skb, VXLAN_HLEN))
1346 goto drop;
1347
1348 unparsed = *vxlan_hdr(skb);
1349 /* VNI flag always required to be set */
1350 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1351 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1352 ntohl(vxlan_hdr(skb)->vx_flags),
1353 ntohl(vxlan_hdr(skb)->vx_vni));
1354 /* Return non vxlan pkt */
1355 goto drop;
1356 }
1357 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1358 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1359
1360 vs = rcu_dereference_sk_user_data(sk);
1361 if (!vs)
1362 goto drop;
1363
1364 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1365
1366 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1367 if (!vxlan)
1368 goto drop;
1369
1370 /* For backwards compatibility, only allow reserved fields to be
1371 * used by VXLAN extensions if explicitly requested.
1372 */
1373 if (vs->flags & VXLAN_F_GPE) {
1374 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1375 goto drop;
1376 raw_proto = true;
1377 }
1378
1379 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1380 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1381 goto drop;
1382
1383 if (vxlan_collect_metadata(vs)) {
1384 struct metadata_dst *tun_dst;
1385
1386 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1387 key32_to_tunnel_id(vni), sizeof(*md));
1388
1389 if (!tun_dst)
1390 goto drop;
1391
1392 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1393
1394 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1395 } else {
1396 memset(md, 0, sizeof(*md));
1397 }
1398
1399 if (vs->flags & VXLAN_F_REMCSUM_RX)
1400 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1401 goto drop;
1402 if (vs->flags & VXLAN_F_GBP)
1403 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1404 /* Note that GBP and GPE can never be active together. This is
1405 * ensured in vxlan_dev_configure.
1406 */
1407
1408 if (unparsed.vx_flags || unparsed.vx_vni) {
1409 /* If there are any unprocessed flags remaining treat
1410 * this as a malformed packet. This behavior diverges from
1411 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1412 * in reserved fields are to be ignored. The approach here
1413 * maintains compatibility with previous stack code, and also
1414 * is more robust and provides a little more security in
1415 * adding extensions to VXLAN.
1416 */
1417 goto drop;
1418 }
1419
1420 if (!raw_proto) {
1421 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1422 goto drop;
1423 } else {
1424 skb_reset_mac_header(skb);
1425 skb->dev = vxlan->dev;
1426 skb->pkt_type = PACKET_HOST;
1427 }
1428
1429 oiph = skb_network_header(skb);
1430 skb_reset_network_header(skb);
1431
1432 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1433 ++vxlan->dev->stats.rx_frame_errors;
1434 ++vxlan->dev->stats.rx_errors;
1435 goto drop;
1436 }
1437
1438 stats = this_cpu_ptr(vxlan->dev->tstats);
1439 u64_stats_update_begin(&stats->syncp);
1440 stats->rx_packets++;
1441 stats->rx_bytes += skb->len;
1442 u64_stats_update_end(&stats->syncp);
1443
1444 gro_cells_receive(&vxlan->gro_cells, skb);
1445 return 0;
1446
1447drop:
1448 /* Consume bad packet */
1449 kfree_skb(skb);
1450 return 0;
1451}
1452
1453static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1454{
1455 struct vxlan_dev *vxlan = netdev_priv(dev);
1456 struct arphdr *parp;
1457 u8 *arpptr, *sha;
1458 __be32 sip, tip;
1459 struct neighbour *n;
1460
1461 if (dev->flags & IFF_NOARP)
1462 goto out;
1463
1464 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1465 dev->stats.tx_dropped++;
1466 goto out;
1467 }
1468 parp = arp_hdr(skb);
1469
1470 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1471 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1472 parp->ar_pro != htons(ETH_P_IP) ||
1473 parp->ar_op != htons(ARPOP_REQUEST) ||
1474 parp->ar_hln != dev->addr_len ||
1475 parp->ar_pln != 4)
1476 goto out;
1477 arpptr = (u8 *)parp + sizeof(struct arphdr);
1478 sha = arpptr;
1479 arpptr += dev->addr_len; /* sha */
1480 memcpy(&sip, arpptr, sizeof(sip));
1481 arpptr += sizeof(sip);
1482 arpptr += dev->addr_len; /* tha */
1483 memcpy(&tip, arpptr, sizeof(tip));
1484
1485 if (ipv4_is_loopback(tip) ||
1486 ipv4_is_multicast(tip))
1487 goto out;
1488
1489 n = neigh_lookup(&arp_tbl, &tip, dev);
1490
1491 if (n) {
1492 struct vxlan_fdb *f;
1493 struct sk_buff *reply;
1494
1495 if (!(n->nud_state & NUD_CONNECTED)) {
1496 neigh_release(n);
1497 goto out;
1498 }
1499
1500 f = vxlan_find_mac(vxlan, n->ha, vni);
1501 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1502 /* bridge-local neighbor */
1503 neigh_release(n);
1504 goto out;
1505 }
1506
1507 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1508 n->ha, sha);
1509
1510 neigh_release(n);
1511
1512 if (reply == NULL)
1513 goto out;
1514
1515 skb_reset_mac_header(reply);
1516 __skb_pull(reply, skb_network_offset(reply));
1517 reply->ip_summed = CHECKSUM_UNNECESSARY;
1518 reply->pkt_type = PACKET_HOST;
1519
1520 if (netif_rx_ni(reply) == NET_RX_DROP)
1521 dev->stats.rx_dropped++;
1522 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1523 union vxlan_addr ipa = {
1524 .sin.sin_addr.s_addr = tip,
1525 .sin.sin_family = AF_INET,
1526 };
1527
1528 vxlan_ip_miss(dev, &ipa);
1529 }
1530out:
1531 consume_skb(skb);
1532 return NETDEV_TX_OK;
1533}
1534
1535#if IS_ENABLED(CONFIG_IPV6)
1536static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1537 struct neighbour *n, bool isrouter)
1538{
1539 struct net_device *dev = request->dev;
1540 struct sk_buff *reply;
1541 struct nd_msg *ns, *na;
1542 struct ipv6hdr *pip6;
1543 u8 *daddr;
1544 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1545 int ns_olen;
1546 int i, len;
1547
1548 if (dev == NULL || !pskb_may_pull(request, request->len))
1549 return NULL;
1550
1551 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1552 sizeof(*na) + na_olen + dev->needed_tailroom;
1553 reply = alloc_skb(len, GFP_ATOMIC);
1554 if (reply == NULL)
1555 return NULL;
1556
1557 reply->protocol = htons(ETH_P_IPV6);
1558 reply->dev = dev;
1559 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1560 skb_push(reply, sizeof(struct ethhdr));
1561 skb_reset_mac_header(reply);
1562
1563 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1564
1565 daddr = eth_hdr(request)->h_source;
1566 ns_olen = request->len - skb_network_offset(request) -
1567 sizeof(struct ipv6hdr) - sizeof(*ns);
1568 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1569 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1570 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1571 break;
1572 }
1573 }
1574
1575 /* Ethernet header */
1576 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1577 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1578 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1579 reply->protocol = htons(ETH_P_IPV6);
1580
1581 skb_pull(reply, sizeof(struct ethhdr));
1582 skb_reset_network_header(reply);
1583 skb_put(reply, sizeof(struct ipv6hdr));
1584
1585 /* IPv6 header */
1586
1587 pip6 = ipv6_hdr(reply);
1588 memset(pip6, 0, sizeof(struct ipv6hdr));
1589 pip6->version = 6;
1590 pip6->priority = ipv6_hdr(request)->priority;
1591 pip6->nexthdr = IPPROTO_ICMPV6;
1592 pip6->hop_limit = 255;
1593 pip6->daddr = ipv6_hdr(request)->saddr;
1594 pip6->saddr = *(struct in6_addr *)n->primary_key;
1595
1596 skb_pull(reply, sizeof(struct ipv6hdr));
1597 skb_reset_transport_header(reply);
1598
1599 /* Neighbor Advertisement */
1600 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1601 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1602 na->icmph.icmp6_router = isrouter;
1603 na->icmph.icmp6_override = 1;
1604 na->icmph.icmp6_solicited = 1;
1605 na->target = ns->target;
1606 ether_addr_copy(&na->opt[2], n->ha);
1607 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1608 na->opt[1] = na_olen >> 3;
1609
1610 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1611 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1612 csum_partial(na, sizeof(*na)+na_olen, 0));
1613
1614 pip6->payload_len = htons(sizeof(*na)+na_olen);
1615
1616 skb_push(reply, sizeof(struct ipv6hdr));
1617
1618 reply->ip_summed = CHECKSUM_UNNECESSARY;
1619
1620 return reply;
1621}
1622
1623static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1624{
1625 struct vxlan_dev *vxlan = netdev_priv(dev);
1626 const struct in6_addr *daddr;
1627 const struct ipv6hdr *iphdr;
1628 struct inet6_dev *in6_dev;
1629 struct neighbour *n;
1630 struct nd_msg *msg;
1631
1632 in6_dev = __in6_dev_get(dev);
1633 if (!in6_dev)
1634 goto out;
1635
1636 iphdr = ipv6_hdr(skb);
1637 daddr = &iphdr->daddr;
1638 msg = (struct nd_msg *)(iphdr + 1);
1639
1640 if (ipv6_addr_loopback(daddr) ||
1641 ipv6_addr_is_multicast(&msg->target))
1642 goto out;
1643
1644 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1645
1646 if (n) {
1647 struct vxlan_fdb *f;
1648 struct sk_buff *reply;
1649
1650 if (!(n->nud_state & NUD_CONNECTED)) {
1651 neigh_release(n);
1652 goto out;
1653 }
1654
1655 f = vxlan_find_mac(vxlan, n->ha, vni);
1656 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1657 /* bridge-local neighbor */
1658 neigh_release(n);
1659 goto out;
1660 }
1661
1662 reply = vxlan_na_create(skb, n,
1663 !!(f ? f->flags & NTF_ROUTER : 0));
1664
1665 neigh_release(n);
1666
1667 if (reply == NULL)
1668 goto out;
1669
1670 if (netif_rx_ni(reply) == NET_RX_DROP)
1671 dev->stats.rx_dropped++;
1672
1673 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1674 union vxlan_addr ipa = {
1675 .sin6.sin6_addr = msg->target,
1676 .sin6.sin6_family = AF_INET6,
1677 };
1678
1679 vxlan_ip_miss(dev, &ipa);
1680 }
1681
1682out:
1683 consume_skb(skb);
1684 return NETDEV_TX_OK;
1685}
1686#endif
1687
1688static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1689{
1690 struct vxlan_dev *vxlan = netdev_priv(dev);
1691 struct neighbour *n;
1692
1693 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1694 return false;
1695
1696 n = NULL;
1697 switch (ntohs(eth_hdr(skb)->h_proto)) {
1698 case ETH_P_IP:
1699 {
1700 struct iphdr *pip;
1701
1702 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1703 return false;
1704 pip = ip_hdr(skb);
1705 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1706 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1707 union vxlan_addr ipa = {
1708 .sin.sin_addr.s_addr = pip->daddr,
1709 .sin.sin_family = AF_INET,
1710 };
1711
1712 vxlan_ip_miss(dev, &ipa);
1713 return false;
1714 }
1715
1716 break;
1717 }
1718#if IS_ENABLED(CONFIG_IPV6)
1719 case ETH_P_IPV6:
1720 {
1721 struct ipv6hdr *pip6;
1722
1723 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1724 return false;
1725 pip6 = ipv6_hdr(skb);
1726 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1727 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1728 union vxlan_addr ipa = {
1729 .sin6.sin6_addr = pip6->daddr,
1730 .sin6.sin6_family = AF_INET6,
1731 };
1732
1733 vxlan_ip_miss(dev, &ipa);
1734 return false;
1735 }
1736
1737 break;
1738 }
1739#endif
1740 default:
1741 return false;
1742 }
1743
1744 if (n) {
1745 bool diff;
1746
1747 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1748 if (diff) {
1749 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1750 dev->addr_len);
1751 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1752 }
1753 neigh_release(n);
1754 return diff;
1755 }
1756
1757 return false;
1758}
1759
1760static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1761 struct vxlan_metadata *md)
1762{
1763 struct vxlanhdr_gbp *gbp;
1764
1765 if (!md->gbp)
1766 return;
1767
1768 gbp = (struct vxlanhdr_gbp *)vxh;
1769 vxh->vx_flags |= VXLAN_HF_GBP;
1770
1771 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1772 gbp->dont_learn = 1;
1773
1774 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1775 gbp->policy_applied = 1;
1776
1777 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1778}
1779
1780static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1781 __be16 protocol)
1782{
1783 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1784
1785 gpe->np_applied = 1;
1786 gpe->next_protocol = tun_p_from_eth_p(protocol);
1787 if (!gpe->next_protocol)
1788 return -EPFNOSUPPORT;
1789 return 0;
1790}
1791
1792static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1793 int iphdr_len, __be32 vni,
1794 struct vxlan_metadata *md, u32 vxflags,
1795 bool udp_sum)
1796{
1797 struct vxlanhdr *vxh;
1798 int min_headroom;
1799 int err;
1800 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1801 __be16 inner_protocol = htons(ETH_P_TEB);
1802
1803 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1804 skb->ip_summed == CHECKSUM_PARTIAL) {
1805 int csum_start = skb_checksum_start_offset(skb);
1806
1807 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1808 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1809 (skb->csum_offset == offsetof(struct udphdr, check) ||
1810 skb->csum_offset == offsetof(struct tcphdr, check)))
1811 type |= SKB_GSO_TUNNEL_REMCSUM;
1812 }
1813
1814 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1815 + VXLAN_HLEN + iphdr_len;
1816
1817 /* Need space for new headers (invalidates iph ptr) */
1818 err = skb_cow_head(skb, min_headroom);
1819 if (unlikely(err))
1820 return err;
1821
1822 err = iptunnel_handle_offloads(skb, type);
1823 if (err)
1824 return err;
1825
1826 vxh = __skb_push(skb, sizeof(*vxh));
1827 vxh->vx_flags = VXLAN_HF_VNI;
1828 vxh->vx_vni = vxlan_vni_field(vni);
1829
1830 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1831 unsigned int start;
1832
1833 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1834 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1835 vxh->vx_flags |= VXLAN_HF_RCO;
1836
1837 if (!skb_is_gso(skb)) {
1838 skb->ip_summed = CHECKSUM_NONE;
1839 skb->encapsulation = 0;
1840 }
1841 }
1842
1843 if (vxflags & VXLAN_F_GBP)
1844 vxlan_build_gbp_hdr(vxh, vxflags, md);
1845 if (vxflags & VXLAN_F_GPE) {
1846 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1847 if (err < 0)
1848 return err;
1849 inner_protocol = skb->protocol;
1850 }
1851
1852 skb_set_inner_protocol(skb, inner_protocol);
1853 return 0;
1854}
1855
1856static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1857 struct vxlan_sock *sock4,
1858 struct sk_buff *skb, int oif, u8 tos,
1859 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1860 struct dst_cache *dst_cache,
1861 const struct ip_tunnel_info *info)
1862{
1863 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1864 struct rtable *rt = NULL;
1865 struct flowi4 fl4;
1866
1867 if (!sock4)
1868 return ERR_PTR(-EIO);
1869
1870 if (tos && !info)
1871 use_cache = false;
1872 if (use_cache) {
1873 rt = dst_cache_get_ip4(dst_cache, saddr);
1874 if (rt)
1875 return rt;
1876 }
1877
1878 memset(&fl4, 0, sizeof(fl4));
1879 fl4.flowi4_oif = oif;
1880 fl4.flowi4_tos = RT_TOS(tos);
1881 fl4.flowi4_mark = skb->mark;
1882 fl4.flowi4_proto = IPPROTO_UDP;
1883 fl4.daddr = daddr;
1884 fl4.saddr = *saddr;
1885 fl4.fl4_dport = dport;
1886 fl4.fl4_sport = sport;
1887
1888 rt = ip_route_output_key(vxlan->net, &fl4);
1889 if (likely(!IS_ERR(rt))) {
1890 if (rt->dst.dev == dev) {
1891 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1892 ip_rt_put(rt);
1893 return ERR_PTR(-ELOOP);
1894 }
1895
1896 *saddr = fl4.saddr;
1897 if (use_cache)
1898 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1899 } else {
1900 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1901 return ERR_PTR(-ENETUNREACH);
1902 }
1903 return rt;
1904}
1905
1906#if IS_ENABLED(CONFIG_IPV6)
1907static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1908 struct net_device *dev,
1909 struct vxlan_sock *sock6,
1910 struct sk_buff *skb, int oif, u8 tos,
1911 __be32 label,
1912 const struct in6_addr *daddr,
1913 struct in6_addr *saddr,
1914 __be16 dport, __be16 sport,
1915 struct dst_cache *dst_cache,
1916 const struct ip_tunnel_info *info)
1917{
1918 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1919 struct dst_entry *ndst;
1920 struct flowi6 fl6;
1921 int err;
1922
1923 if (!sock6)
1924 return ERR_PTR(-EIO);
1925
1926 if (tos && !info)
1927 use_cache = false;
1928 if (use_cache) {
1929 ndst = dst_cache_get_ip6(dst_cache, saddr);
1930 if (ndst)
1931 return ndst;
1932 }
1933
1934 memset(&fl6, 0, sizeof(fl6));
1935 fl6.flowi6_oif = oif;
1936 fl6.daddr = *daddr;
1937 fl6.saddr = *saddr;
1938 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1939 fl6.flowi6_mark = skb->mark;
1940 fl6.flowi6_proto = IPPROTO_UDP;
1941 fl6.fl6_dport = dport;
1942 fl6.fl6_sport = sport;
1943
1944 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1945 sock6->sock->sk,
1946 &ndst, &fl6);
1947 if (unlikely(err < 0)) {
1948 netdev_dbg(dev, "no route to %pI6\n", daddr);
1949 return ERR_PTR(-ENETUNREACH);
1950 }
1951
1952 if (unlikely(ndst->dev == dev)) {
1953 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1954 dst_release(ndst);
1955 return ERR_PTR(-ELOOP);
1956 }
1957
1958 *saddr = fl6.saddr;
1959 if (use_cache)
1960 dst_cache_set_ip6(dst_cache, ndst, saddr);
1961 return ndst;
1962}
1963#endif
1964
1965/* Bypass encapsulation if the destination is local */
1966static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1967 struct vxlan_dev *dst_vxlan, __be32 vni)
1968{
1969 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1970 union vxlan_addr loopback;
1971 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1972 struct net_device *dev = skb->dev;
1973 int len = skb->len;
1974
1975 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1976 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1977 skb->pkt_type = PACKET_HOST;
1978 skb->encapsulation = 0;
1979 skb->dev = dst_vxlan->dev;
1980 __skb_pull(skb, skb_network_offset(skb));
1981
1982 if (remote_ip->sa.sa_family == AF_INET) {
1983 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1984 loopback.sa.sa_family = AF_INET;
1985#if IS_ENABLED(CONFIG_IPV6)
1986 } else {
1987 loopback.sin6.sin6_addr = in6addr_loopback;
1988 loopback.sa.sa_family = AF_INET6;
1989#endif
1990 }
1991
1992 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
1993 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
1994 vni);
1995
1996 u64_stats_update_begin(&tx_stats->syncp);
1997 tx_stats->tx_packets++;
1998 tx_stats->tx_bytes += len;
1999 u64_stats_update_end(&tx_stats->syncp);
2000
2001 if (netif_rx(skb) == NET_RX_SUCCESS) {
2002 u64_stats_update_begin(&rx_stats->syncp);
2003 rx_stats->rx_packets++;
2004 rx_stats->rx_bytes += len;
2005 u64_stats_update_end(&rx_stats->syncp);
2006 } else {
2007 dev->stats.rx_dropped++;
2008 }
2009}
2010
2011static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2012 struct vxlan_dev *vxlan,
2013 union vxlan_addr *daddr,
2014 __be16 dst_port, int dst_ifindex, __be32 vni,
2015 struct dst_entry *dst,
2016 u32 rt_flags)
2017{
2018#if IS_ENABLED(CONFIG_IPV6)
2019 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2020 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2021 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2022 */
2023 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2024#endif
2025 /* Bypass encapsulation if the destination is local */
2026 if (rt_flags & RTCF_LOCAL &&
2027 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2028 struct vxlan_dev *dst_vxlan;
2029
2030 dst_release(dst);
2031 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2032 daddr->sa.sa_family, dst_port,
2033 vxlan->cfg.flags);
2034 if (!dst_vxlan) {
2035 dev->stats.tx_errors++;
2036 kfree_skb(skb);
2037
2038 return -ENOENT;
2039 }
2040 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2041 return 1;
2042 }
2043
2044 return 0;
2045}
2046
2047static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2048 __be32 default_vni, struct vxlan_rdst *rdst,
2049 bool did_rsc)
2050{
2051 struct dst_cache *dst_cache;
2052 struct ip_tunnel_info *info;
2053 struct vxlan_dev *vxlan = netdev_priv(dev);
2054 const struct iphdr *old_iph = ip_hdr(skb);
2055 union vxlan_addr *dst;
2056 union vxlan_addr remote_ip, local_ip;
2057 struct vxlan_metadata _md;
2058 struct vxlan_metadata *md = &_md;
2059 __be16 src_port = 0, dst_port;
2060 struct dst_entry *ndst = NULL;
2061 __be32 vni, label;
2062 __u8 tos, ttl;
2063 int ifindex;
2064 int err;
2065 u32 flags = vxlan->cfg.flags;
2066 bool udp_sum = false;
2067 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2068
2069 info = skb_tunnel_info(skb);
2070
2071 if (rdst) {
2072 dst = &rdst->remote_ip;
2073 if (vxlan_addr_any(dst)) {
2074 if (did_rsc) {
2075 /* short-circuited back to local bridge */
2076 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2077 return;
2078 }
2079 goto drop;
2080 }
2081
2082 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2083 vni = (rdst->remote_vni) ? : default_vni;
2084 ifindex = rdst->remote_ifindex;
2085 local_ip = vxlan->cfg.saddr;
2086 dst_cache = &rdst->dst_cache;
2087 md->gbp = skb->mark;
2088 ttl = vxlan->cfg.ttl;
2089 if (!ttl && vxlan_addr_multicast(dst))
2090 ttl = 1;
2091
2092 tos = vxlan->cfg.tos;
2093 if (tos == 1)
2094 tos = ip_tunnel_get_dsfield(old_iph, skb);
2095
2096 if (dst->sa.sa_family == AF_INET)
2097 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2098 else
2099 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2100 label = vxlan->cfg.label;
2101 } else {
2102 if (!info) {
2103 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2104 dev->name);
2105 goto drop;
2106 }
2107 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2108 if (remote_ip.sa.sa_family == AF_INET) {
2109 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2110 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2111 } else {
2112 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2113 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2114 }
2115 dst = &remote_ip;
2116 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2117 vni = tunnel_id_to_key32(info->key.tun_id);
2118 ifindex = 0;
2119 dst_cache = &info->dst_cache;
2120 if (info->options_len)
2121 md = ip_tunnel_info_opts(info);
2122 ttl = info->key.ttl;
2123 tos = info->key.tos;
2124 label = info->key.label;
2125 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2126 }
2127 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2128 vxlan->cfg.port_max, true);
2129
2130 rcu_read_lock();
2131 if (dst->sa.sa_family == AF_INET) {
2132 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2133 struct rtable *rt;
2134 __be16 df = 0;
2135
2136 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2137 dst->sin.sin_addr.s_addr,
2138 &local_ip.sin.sin_addr.s_addr,
2139 dst_port, src_port,
2140 dst_cache, info);
2141 if (IS_ERR(rt)) {
2142 err = PTR_ERR(rt);
2143 goto tx_error;
2144 }
2145
2146 /* Bypass encapsulation if the destination is local */
2147 if (!info) {
2148 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2149 dst_port, ifindex, vni,
2150 &rt->dst, rt->rt_flags);
2151 if (err)
2152 goto out_unlock;
2153 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2154 df = htons(IP_DF);
2155 }
2156
2157 ndst = &rt->dst;
2158 if (skb_dst(skb)) {
2159 int mtu = dst_mtu(ndst) - VXLAN_HEADROOM;
2160
2161 skb_dst_update_pmtu(skb, mtu);
2162 }
2163
2164 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2165 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2166 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2167 vni, md, flags, udp_sum);
2168 if (err < 0)
2169 goto tx_error;
2170
2171 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2172 dst->sin.sin_addr.s_addr, tos, ttl, df,
2173 src_port, dst_port, xnet, !udp_sum);
2174#if IS_ENABLED(CONFIG_IPV6)
2175 } else {
2176 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2177
2178 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2179 label, &dst->sin6.sin6_addr,
2180 &local_ip.sin6.sin6_addr,
2181 dst_port, src_port,
2182 dst_cache, info);
2183 if (IS_ERR(ndst)) {
2184 err = PTR_ERR(ndst);
2185 ndst = NULL;
2186 goto tx_error;
2187 }
2188
2189 if (!info) {
2190 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2191
2192 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2193 dst_port, ifindex, vni,
2194 ndst, rt6i_flags);
2195 if (err)
2196 goto out_unlock;
2197 }
2198
2199 if (skb_dst(skb)) {
2200 int mtu = dst_mtu(ndst) - VXLAN6_HEADROOM;
2201
2202 skb_dst_update_pmtu(skb, mtu);
2203 }
2204
2205 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2206 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2207 skb_scrub_packet(skb, xnet);
2208 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2209 vni, md, flags, udp_sum);
2210 if (err < 0)
2211 goto tx_error;
2212
2213 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2214 &local_ip.sin6.sin6_addr,
2215 &dst->sin6.sin6_addr, tos, ttl,
2216 label, src_port, dst_port, !udp_sum);
2217#endif
2218 }
2219out_unlock:
2220 rcu_read_unlock();
2221 return;
2222
2223drop:
2224 dev->stats.tx_dropped++;
2225 dev_kfree_skb(skb);
2226 return;
2227
2228tx_error:
2229 rcu_read_unlock();
2230 if (err == -ELOOP)
2231 dev->stats.collisions++;
2232 else if (err == -ENETUNREACH)
2233 dev->stats.tx_carrier_errors++;
2234 dst_release(ndst);
2235 dev->stats.tx_errors++;
2236 kfree_skb(skb);
2237}
2238
2239/* Transmit local packets over Vxlan
2240 *
2241 * Outer IP header inherits ECN and DF from inner header.
2242 * Outer UDP destination is the VXLAN assigned port.
2243 * source port is based on hash of flow
2244 */
2245static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2246{
2247 struct vxlan_dev *vxlan = netdev_priv(dev);
2248 struct vxlan_rdst *rdst, *fdst = NULL;
2249 const struct ip_tunnel_info *info;
2250 bool did_rsc = false;
2251 struct vxlan_fdb *f;
2252 struct ethhdr *eth;
2253 __be32 vni = 0;
2254
2255 info = skb_tunnel_info(skb);
2256
2257 skb_reset_mac_header(skb);
2258
2259 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2260 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2261 info->mode & IP_TUNNEL_INFO_TX) {
2262 vni = tunnel_id_to_key32(info->key.tun_id);
2263 } else {
2264 if (info && info->mode & IP_TUNNEL_INFO_TX)
2265 vxlan_xmit_one(skb, dev, vni, NULL, false);
2266 else
2267 kfree_skb(skb);
2268 return NETDEV_TX_OK;
2269 }
2270 }
2271
2272 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2273 eth = eth_hdr(skb);
2274 if (ntohs(eth->h_proto) == ETH_P_ARP)
2275 return arp_reduce(dev, skb, vni);
2276#if IS_ENABLED(CONFIG_IPV6)
2277 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2278 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2279 sizeof(struct nd_msg)) &&
2280 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2281 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2282
2283 if (m->icmph.icmp6_code == 0 &&
2284 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2285 return neigh_reduce(dev, skb, vni);
2286 }
2287#endif
2288 }
2289
2290 eth = eth_hdr(skb);
2291 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2292 did_rsc = false;
2293
2294 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2295 (ntohs(eth->h_proto) == ETH_P_IP ||
2296 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2297 did_rsc = route_shortcircuit(dev, skb);
2298 if (did_rsc)
2299 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2300 }
2301
2302 if (f == NULL) {
2303 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2304 if (f == NULL) {
2305 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2306 !is_multicast_ether_addr(eth->h_dest))
2307 vxlan_fdb_miss(vxlan, eth->h_dest);
2308
2309 dev->stats.tx_dropped++;
2310 kfree_skb(skb);
2311 return NETDEV_TX_OK;
2312 }
2313 }
2314
2315 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2316 struct sk_buff *skb1;
2317
2318 if (!fdst) {
2319 fdst = rdst;
2320 continue;
2321 }
2322 skb1 = skb_clone(skb, GFP_ATOMIC);
2323 if (skb1)
2324 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2325 }
2326
2327 if (fdst)
2328 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2329 else
2330 kfree_skb(skb);
2331 return NETDEV_TX_OK;
2332}
2333
2334/* Walk the forwarding table and purge stale entries */
2335static void vxlan_cleanup(struct timer_list *t)
2336{
2337 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2338 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2339 unsigned int h;
2340
2341 if (!netif_running(vxlan->dev))
2342 return;
2343
2344 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2345 struct hlist_node *p, *n;
2346
2347 spin_lock_bh(&vxlan->hash_lock);
2348 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2349 struct vxlan_fdb *f
2350 = container_of(p, struct vxlan_fdb, hlist);
2351 unsigned long timeout;
2352
2353 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2354 continue;
2355
2356 if (f->flags & NTF_EXT_LEARNED)
2357 continue;
2358
2359 timeout = f->used + vxlan->cfg.age_interval * HZ;
2360 if (time_before_eq(timeout, jiffies)) {
2361 netdev_dbg(vxlan->dev,
2362 "garbage collect %pM\n",
2363 f->eth_addr);
2364 f->state = NUD_STALE;
2365 vxlan_fdb_destroy(vxlan, f);
2366 } else if (time_before(timeout, next_timer))
2367 next_timer = timeout;
2368 }
2369 spin_unlock_bh(&vxlan->hash_lock);
2370 }
2371
2372 mod_timer(&vxlan->age_timer, next_timer);
2373}
2374
2375static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2376{
2377 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2378
2379 spin_lock(&vn->sock_lock);
2380 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2381#if IS_ENABLED(CONFIG_IPV6)
2382 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2383#endif
2384 spin_unlock(&vn->sock_lock);
2385}
2386
2387static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2388 struct vxlan_dev_node *node)
2389{
2390 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2391 __be32 vni = vxlan->default_dst.remote_vni;
2392
2393 node->vxlan = vxlan;
2394 spin_lock(&vn->sock_lock);
2395 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2396 spin_unlock(&vn->sock_lock);
2397}
2398
2399/* Setup stats when device is created */
2400static int vxlan_init(struct net_device *dev)
2401{
2402 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2403 if (!dev->tstats)
2404 return -ENOMEM;
2405
2406 return 0;
2407}
2408
2409static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2410{
2411 struct vxlan_fdb *f;
2412
2413 spin_lock_bh(&vxlan->hash_lock);
2414 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2415 if (f)
2416 vxlan_fdb_destroy(vxlan, f);
2417 spin_unlock_bh(&vxlan->hash_lock);
2418}
2419
2420static void vxlan_uninit(struct net_device *dev)
2421{
2422 struct vxlan_dev *vxlan = netdev_priv(dev);
2423
2424 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2425
2426 free_percpu(dev->tstats);
2427}
2428
2429/* Start ageing timer and join group when device is brought up */
2430static int vxlan_open(struct net_device *dev)
2431{
2432 struct vxlan_dev *vxlan = netdev_priv(dev);
2433 int ret;
2434
2435 ret = vxlan_sock_add(vxlan);
2436 if (ret < 0)
2437 return ret;
2438
2439 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2440 ret = vxlan_igmp_join(vxlan);
2441 if (ret == -EADDRINUSE)
2442 ret = 0;
2443 if (ret) {
2444 vxlan_sock_release(vxlan);
2445 return ret;
2446 }
2447 }
2448
2449 if (vxlan->cfg.age_interval)
2450 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2451
2452 return ret;
2453}
2454
2455/* Purge the forwarding table */
2456static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2457{
2458 unsigned int h;
2459
2460 spin_lock_bh(&vxlan->hash_lock);
2461 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2462 struct hlist_node *p, *n;
2463 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2464 struct vxlan_fdb *f
2465 = container_of(p, struct vxlan_fdb, hlist);
2466 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2467 continue;
2468 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2469 if (!is_zero_ether_addr(f->eth_addr))
2470 vxlan_fdb_destroy(vxlan, f);
2471 }
2472 }
2473 spin_unlock_bh(&vxlan->hash_lock);
2474}
2475
2476/* Cleanup timer and forwarding table on shutdown */
2477static int vxlan_stop(struct net_device *dev)
2478{
2479 struct vxlan_dev *vxlan = netdev_priv(dev);
2480 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2481 int ret = 0;
2482
2483 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2484 !vxlan_group_used(vn, vxlan))
2485 ret = vxlan_igmp_leave(vxlan);
2486
2487 del_timer_sync(&vxlan->age_timer);
2488
2489 vxlan_flush(vxlan, false);
2490 vxlan_sock_release(vxlan);
2491
2492 return ret;
2493}
2494
2495/* Stub, nothing needs to be done. */
2496static void vxlan_set_multicast_list(struct net_device *dev)
2497{
2498}
2499
2500static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2501{
2502 struct vxlan_dev *vxlan = netdev_priv(dev);
2503 struct vxlan_rdst *dst = &vxlan->default_dst;
2504 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2505 dst->remote_ifindex);
2506 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2507
2508 /* This check is different than dev->max_mtu, because it looks at
2509 * the lowerdev->mtu, rather than the static dev->max_mtu
2510 */
2511 if (lowerdev) {
2512 int max_mtu = lowerdev->mtu -
2513 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2514 if (new_mtu > max_mtu)
2515 return -EINVAL;
2516 }
2517
2518 dev->mtu = new_mtu;
2519 return 0;
2520}
2521
2522static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2523{
2524 struct vxlan_dev *vxlan = netdev_priv(dev);
2525 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2526 __be16 sport, dport;
2527
2528 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2529 vxlan->cfg.port_max, true);
2530 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2531
2532 if (ip_tunnel_info_af(info) == AF_INET) {
2533 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2534 struct rtable *rt;
2535
2536 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2537 info->key.u.ipv4.dst,
2538 &info->key.u.ipv4.src, dport, sport,
2539 &info->dst_cache, info);
2540 if (IS_ERR(rt))
2541 return PTR_ERR(rt);
2542 ip_rt_put(rt);
2543 } else {
2544#if IS_ENABLED(CONFIG_IPV6)
2545 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2546 struct dst_entry *ndst;
2547
2548 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2549 info->key.label, &info->key.u.ipv6.dst,
2550 &info->key.u.ipv6.src, dport, sport,
2551 &info->dst_cache, info);
2552 if (IS_ERR(ndst))
2553 return PTR_ERR(ndst);
2554 dst_release(ndst);
2555#else /* !CONFIG_IPV6 */
2556 return -EPFNOSUPPORT;
2557#endif
2558 }
2559 info->key.tp_src = sport;
2560 info->key.tp_dst = dport;
2561 return 0;
2562}
2563
2564static const struct net_device_ops vxlan_netdev_ether_ops = {
2565 .ndo_init = vxlan_init,
2566 .ndo_uninit = vxlan_uninit,
2567 .ndo_open = vxlan_open,
2568 .ndo_stop = vxlan_stop,
2569 .ndo_start_xmit = vxlan_xmit,
2570 .ndo_get_stats64 = ip_tunnel_get_stats64,
2571 .ndo_set_rx_mode = vxlan_set_multicast_list,
2572 .ndo_change_mtu = vxlan_change_mtu,
2573 .ndo_validate_addr = eth_validate_addr,
2574 .ndo_set_mac_address = eth_mac_addr,
2575 .ndo_fdb_add = vxlan_fdb_add,
2576 .ndo_fdb_del = vxlan_fdb_delete,
2577 .ndo_fdb_dump = vxlan_fdb_dump,
2578 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2579};
2580
2581static const struct net_device_ops vxlan_netdev_raw_ops = {
2582 .ndo_init = vxlan_init,
2583 .ndo_uninit = vxlan_uninit,
2584 .ndo_open = vxlan_open,
2585 .ndo_stop = vxlan_stop,
2586 .ndo_start_xmit = vxlan_xmit,
2587 .ndo_get_stats64 = ip_tunnel_get_stats64,
2588 .ndo_change_mtu = vxlan_change_mtu,
2589 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2590};
2591
2592/* Info for udev, that this is a virtual tunnel endpoint */
2593static struct device_type vxlan_type = {
2594 .name = "vxlan",
2595};
2596
2597/* Calls the ndo_udp_tunnel_add of the caller in order to
2598 * supply the listening VXLAN udp ports. Callers are expected
2599 * to implement the ndo_udp_tunnel_add.
2600 */
2601static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2602{
2603 struct vxlan_sock *vs;
2604 struct net *net = dev_net(dev);
2605 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2606 unsigned int i;
2607
2608 spin_lock(&vn->sock_lock);
2609 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2610 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2611 unsigned short type;
2612
2613 if (vs->flags & VXLAN_F_GPE)
2614 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2615 else
2616 type = UDP_TUNNEL_TYPE_VXLAN;
2617
2618 if (push)
2619 udp_tunnel_push_rx_port(dev, vs->sock, type);
2620 else
2621 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2622 }
2623 }
2624 spin_unlock(&vn->sock_lock);
2625}
2626
2627/* Initialize the device structure. */
2628static void vxlan_setup(struct net_device *dev)
2629{
2630 struct vxlan_dev *vxlan = netdev_priv(dev);
2631 unsigned int h;
2632
2633 eth_hw_addr_random(dev);
2634 ether_setup(dev);
2635
2636 dev->needs_free_netdev = true;
2637 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2638
2639 dev->features |= NETIF_F_LLTX;
2640 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2641 dev->features |= NETIF_F_RXCSUM;
2642 dev->features |= NETIF_F_GSO_SOFTWARE;
2643
2644 dev->vlan_features = dev->features;
2645 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2646 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2647 netif_keep_dst(dev);
2648 dev->priv_flags |= IFF_NO_QUEUE;
2649
2650 /* MTU range: 68 - 65535 */
2651 dev->min_mtu = ETH_MIN_MTU;
2652 dev->max_mtu = ETH_MAX_MTU;
2653
2654 INIT_LIST_HEAD(&vxlan->next);
2655 spin_lock_init(&vxlan->hash_lock);
2656
2657 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2658
2659 vxlan->dev = dev;
2660
2661 gro_cells_init(&vxlan->gro_cells, dev);
2662
2663 for (h = 0; h < FDB_HASH_SIZE; ++h)
2664 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2665}
2666
2667static void vxlan_ether_setup(struct net_device *dev)
2668{
2669 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2670 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2671 dev->netdev_ops = &vxlan_netdev_ether_ops;
2672}
2673
2674static void vxlan_raw_setup(struct net_device *dev)
2675{
2676 dev->header_ops = NULL;
2677 dev->type = ARPHRD_NONE;
2678 dev->hard_header_len = 0;
2679 dev->addr_len = 0;
2680 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2681 dev->netdev_ops = &vxlan_netdev_raw_ops;
2682}
2683
2684static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2685 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2686 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2687 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2688 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2689 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2690 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2691 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2692 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2693 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2694 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2695 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2696 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2697 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2698 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2699 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2700 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2701 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2702 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2703 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2704 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2705 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2706 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2707 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2708 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2709 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2710 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2711 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2712};
2713
2714static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2715 struct netlink_ext_ack *extack)
2716{
2717 if (tb[IFLA_ADDRESS]) {
2718 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2719 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2720 "Provided link layer address is not Ethernet");
2721 return -EINVAL;
2722 }
2723
2724 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2725 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2726 "Provided Ethernet address is not unicast");
2727 return -EADDRNOTAVAIL;
2728 }
2729 }
2730
2731 if (tb[IFLA_MTU]) {
2732 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2733
2734 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2735 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2736 "MTU must be between 68 and 65535");
2737 return -EINVAL;
2738 }
2739 }
2740
2741 if (!data) {
2742 NL_SET_ERR_MSG(extack,
2743 "Required attributes not provided to perform the operation");
2744 return -EINVAL;
2745 }
2746
2747 if (data[IFLA_VXLAN_ID]) {
2748 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2749
2750 if (id >= VXLAN_N_VID) {
2751 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2752 "VXLAN ID must be lower than 16777216");
2753 return -ERANGE;
2754 }
2755 }
2756
2757 if (data[IFLA_VXLAN_PORT_RANGE]) {
2758 const struct ifla_vxlan_port_range *p
2759 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2760
2761 if (ntohs(p->high) < ntohs(p->low)) {
2762 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2763 "Invalid source port range");
2764 return -EINVAL;
2765 }
2766 }
2767
2768 return 0;
2769}
2770
2771static void vxlan_get_drvinfo(struct net_device *netdev,
2772 struct ethtool_drvinfo *drvinfo)
2773{
2774 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2775 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2776}
2777
2778static const struct ethtool_ops vxlan_ethtool_ops = {
2779 .get_drvinfo = vxlan_get_drvinfo,
2780 .get_link = ethtool_op_get_link,
2781};
2782
2783static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2784 __be16 port, u32 flags)
2785{
2786 struct socket *sock;
2787 struct udp_port_cfg udp_conf;
2788 int err;
2789
2790 memset(&udp_conf, 0, sizeof(udp_conf));
2791
2792 if (ipv6) {
2793 udp_conf.family = AF_INET6;
2794 udp_conf.use_udp6_rx_checksums =
2795 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2796 udp_conf.ipv6_v6only = 1;
2797 } else {
2798 udp_conf.family = AF_INET;
2799 }
2800
2801 udp_conf.local_udp_port = port;
2802
2803 /* Open UDP socket */
2804 err = udp_sock_create(net, &udp_conf, &sock);
2805 if (err < 0)
2806 return ERR_PTR(err);
2807
2808 return sock;
2809}
2810
2811/* Create new listen socket if needed */
2812static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2813 __be16 port, u32 flags)
2814{
2815 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2816 struct vxlan_sock *vs;
2817 struct socket *sock;
2818 unsigned int h;
2819 struct udp_tunnel_sock_cfg tunnel_cfg;
2820
2821 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2822 if (!vs)
2823 return ERR_PTR(-ENOMEM);
2824
2825 for (h = 0; h < VNI_HASH_SIZE; ++h)
2826 INIT_HLIST_HEAD(&vs->vni_list[h]);
2827
2828 sock = vxlan_create_sock(net, ipv6, port, flags);
2829 if (IS_ERR(sock)) {
2830 kfree(vs);
2831 return ERR_CAST(sock);
2832 }
2833
2834 vs->sock = sock;
2835 refcount_set(&vs->refcnt, 1);
2836 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2837
2838 spin_lock(&vn->sock_lock);
2839 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2840 udp_tunnel_notify_add_rx_port(sock,
2841 (vs->flags & VXLAN_F_GPE) ?
2842 UDP_TUNNEL_TYPE_VXLAN_GPE :
2843 UDP_TUNNEL_TYPE_VXLAN);
2844 spin_unlock(&vn->sock_lock);
2845
2846 /* Mark socket as an encapsulation socket. */
2847 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2848 tunnel_cfg.sk_user_data = vs;
2849 tunnel_cfg.encap_type = 1;
2850 tunnel_cfg.encap_rcv = vxlan_rcv;
2851 tunnel_cfg.encap_destroy = NULL;
2852 tunnel_cfg.gro_receive = vxlan_gro_receive;
2853 tunnel_cfg.gro_complete = vxlan_gro_complete;
2854
2855 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2856
2857 return vs;
2858}
2859
2860static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2861{
2862 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2863 struct vxlan_sock *vs = NULL;
2864 struct vxlan_dev_node *node;
2865
2866 if (!vxlan->cfg.no_share) {
2867 spin_lock(&vn->sock_lock);
2868 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2869 vxlan->cfg.dst_port, vxlan->cfg.flags);
2870 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2871 spin_unlock(&vn->sock_lock);
2872 return -EBUSY;
2873 }
2874 spin_unlock(&vn->sock_lock);
2875 }
2876 if (!vs)
2877 vs = vxlan_socket_create(vxlan->net, ipv6,
2878 vxlan->cfg.dst_port, vxlan->cfg.flags);
2879 if (IS_ERR(vs))
2880 return PTR_ERR(vs);
2881#if IS_ENABLED(CONFIG_IPV6)
2882 if (ipv6) {
2883 rcu_assign_pointer(vxlan->vn6_sock, vs);
2884 node = &vxlan->hlist6;
2885 } else
2886#endif
2887 {
2888 rcu_assign_pointer(vxlan->vn4_sock, vs);
2889 node = &vxlan->hlist4;
2890 }
2891 vxlan_vs_add_dev(vs, vxlan, node);
2892 return 0;
2893}
2894
2895static int vxlan_sock_add(struct vxlan_dev *vxlan)
2896{
2897 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2898 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2899 bool ipv4 = !ipv6 || metadata;
2900 int ret = 0;
2901
2902 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2903#if IS_ENABLED(CONFIG_IPV6)
2904 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2905 if (ipv6) {
2906 ret = __vxlan_sock_add(vxlan, true);
2907 if (ret < 0 && ret != -EAFNOSUPPORT)
2908 ipv4 = false;
2909 }
2910#endif
2911 if (ipv4)
2912 ret = __vxlan_sock_add(vxlan, false);
2913 if (ret < 0)
2914 vxlan_sock_release(vxlan);
2915 return ret;
2916}
2917
2918static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2919 struct net_device **lower,
2920 struct vxlan_dev *old,
2921 struct netlink_ext_ack *extack)
2922{
2923 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2924 struct vxlan_dev *tmp;
2925 bool use_ipv6 = false;
2926
2927 if (conf->flags & VXLAN_F_GPE) {
2928 /* For now, allow GPE only together with
2929 * COLLECT_METADATA. This can be relaxed later; in such
2930 * case, the other side of the PtP link will have to be
2931 * provided.
2932 */
2933 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2934 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2935 NL_SET_ERR_MSG(extack,
2936 "VXLAN GPE does not support this combination of attributes");
2937 return -EINVAL;
2938 }
2939 }
2940
2941 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
2942 /* Unless IPv6 is explicitly requested, assume IPv4 */
2943 conf->remote_ip.sa.sa_family = AF_INET;
2944 conf->saddr.sa.sa_family = AF_INET;
2945 } else if (!conf->remote_ip.sa.sa_family) {
2946 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
2947 } else if (!conf->saddr.sa.sa_family) {
2948 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
2949 }
2950
2951 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
2952 NL_SET_ERR_MSG(extack,
2953 "Local and remote address must be from the same family");
2954 return -EINVAL;
2955 }
2956
2957 if (vxlan_addr_multicast(&conf->saddr)) {
2958 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
2959 return -EINVAL;
2960 }
2961
2962 if (conf->saddr.sa.sa_family == AF_INET6) {
2963 if (!IS_ENABLED(CONFIG_IPV6)) {
2964 NL_SET_ERR_MSG(extack,
2965 "IPv6 support not enabled in the kernel");
2966 return -EPFNOSUPPORT;
2967 }
2968 use_ipv6 = true;
2969 conf->flags |= VXLAN_F_IPV6;
2970
2971 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2972 int local_type =
2973 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
2974 int remote_type =
2975 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
2976
2977 if (local_type & IPV6_ADDR_LINKLOCAL) {
2978 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
2979 (remote_type != IPV6_ADDR_ANY)) {
2980 NL_SET_ERR_MSG(extack,
2981 "Invalid combination of local and remote address scopes");
2982 return -EINVAL;
2983 }
2984
2985 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
2986 } else {
2987 if (remote_type ==
2988 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
2989 NL_SET_ERR_MSG(extack,
2990 "Invalid combination of local and remote address scopes");
2991 return -EINVAL;
2992 }
2993
2994 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
2995 }
2996 }
2997 }
2998
2999 if (conf->label && !use_ipv6) {
3000 NL_SET_ERR_MSG(extack,
3001 "Label attribute only applies to IPv6 VXLAN devices");
3002 return -EINVAL;
3003 }
3004
3005 if (conf->remote_ifindex) {
3006 struct net_device *lowerdev;
3007
3008 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3009 if (!lowerdev) {
3010 NL_SET_ERR_MSG(extack,
3011 "Invalid local interface, device not found");
3012 return -ENODEV;
3013 }
3014
3015#if IS_ENABLED(CONFIG_IPV6)
3016 if (use_ipv6) {
3017 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3018 if (idev && idev->cnf.disable_ipv6) {
3019 NL_SET_ERR_MSG(extack,
3020 "IPv6 support disabled by administrator");
3021 return -EPERM;
3022 }
3023 }
3024#endif
3025
3026 *lower = lowerdev;
3027 } else {
3028 if (vxlan_addr_multicast(&conf->remote_ip)) {
3029 NL_SET_ERR_MSG(extack,
3030 "Local interface required for multicast remote destination");
3031
3032 return -EINVAL;
3033 }
3034
3035#if IS_ENABLED(CONFIG_IPV6)
3036 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3037 NL_SET_ERR_MSG(extack,
3038 "Local interface required for link-local local/remote addresses");
3039 return -EINVAL;
3040 }
3041#endif
3042
3043 *lower = NULL;
3044 }
3045
3046 if (!conf->dst_port) {
3047 if (conf->flags & VXLAN_F_GPE)
3048 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3049 else
3050 conf->dst_port = htons(vxlan_port);
3051 }
3052
3053 if (!conf->age_interval)
3054 conf->age_interval = FDB_AGE_DEFAULT;
3055
3056 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3057 if (tmp == old)
3058 continue;
3059
3060 if (tmp->cfg.vni != conf->vni)
3061 continue;
3062 if (tmp->cfg.dst_port != conf->dst_port)
3063 continue;
3064 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3065 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3066 continue;
3067
3068 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3069 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3070 continue;
3071
3072 NL_SET_ERR_MSG(extack,
3073 "A VXLAN device with the specified VNI already exists");
3074 return -EEXIST;
3075 }
3076
3077 return 0;
3078}
3079
3080static void vxlan_config_apply(struct net_device *dev,
3081 struct vxlan_config *conf,
3082 struct net_device *lowerdev,
3083 struct net *src_net,
3084 bool changelink)
3085{
3086 struct vxlan_dev *vxlan = netdev_priv(dev);
3087 struct vxlan_rdst *dst = &vxlan->default_dst;
3088 unsigned short needed_headroom = ETH_HLEN;
3089 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3090 int max_mtu = ETH_MAX_MTU;
3091
3092 if (!changelink) {
3093 if (conf->flags & VXLAN_F_GPE)
3094 vxlan_raw_setup(dev);
3095 else
3096 vxlan_ether_setup(dev);
3097
3098 if (conf->mtu)
3099 dev->mtu = conf->mtu;
3100
3101 vxlan->net = src_net;
3102 }
3103
3104 dst->remote_vni = conf->vni;
3105
3106 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3107
3108 if (lowerdev) {
3109 dst->remote_ifindex = conf->remote_ifindex;
3110
3111 dev->gso_max_size = lowerdev->gso_max_size;
3112 dev->gso_max_segs = lowerdev->gso_max_segs;
3113
3114 needed_headroom = lowerdev->hard_header_len;
3115
3116 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3117 VXLAN_HEADROOM);
3118 if (max_mtu < ETH_MIN_MTU)
3119 max_mtu = ETH_MIN_MTU;
3120
3121 if (!changelink && !conf->mtu)
3122 dev->mtu = max_mtu;
3123 }
3124
3125 if (dev->mtu > max_mtu)
3126 dev->mtu = max_mtu;
3127
3128 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3129 needed_headroom += VXLAN6_HEADROOM;
3130 else
3131 needed_headroom += VXLAN_HEADROOM;
3132 dev->needed_headroom = needed_headroom;
3133
3134 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3135}
3136
3137static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3138 struct vxlan_config *conf, bool changelink,
3139 struct netlink_ext_ack *extack)
3140{
3141 struct vxlan_dev *vxlan = netdev_priv(dev);
3142 struct net_device *lowerdev;
3143 int ret;
3144
3145 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3146 if (ret)
3147 return ret;
3148
3149 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3150
3151 return 0;
3152}
3153
3154static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3155 struct vxlan_config *conf,
3156 struct netlink_ext_ack *extack)
3157{
3158 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3159 struct vxlan_dev *vxlan = netdev_priv(dev);
3160 int err;
3161
3162 err = vxlan_dev_configure(net, dev, conf, false, extack);
3163 if (err)
3164 return err;
3165
3166 dev->ethtool_ops = &vxlan_ethtool_ops;
3167
3168 /* create an fdb entry for a valid default destination */
3169 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3170 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3171 &vxlan->default_dst.remote_ip,
3172 NUD_REACHABLE | NUD_PERMANENT,
3173 NLM_F_EXCL | NLM_F_CREATE,
3174 vxlan->cfg.dst_port,
3175 vxlan->default_dst.remote_vni,
3176 vxlan->default_dst.remote_vni,
3177 vxlan->default_dst.remote_ifindex,
3178 NTF_SELF);
3179 if (err)
3180 return err;
3181 }
3182
3183 err = register_netdevice(dev);
3184 if (err) {
3185 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3186 return err;
3187 }
3188
3189 list_add(&vxlan->next, &vn->vxlan_list);
3190 return 0;
3191}
3192
3193static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3194 struct net_device *dev, struct vxlan_config *conf,
3195 bool changelink)
3196{
3197 struct vxlan_dev *vxlan = netdev_priv(dev);
3198
3199 memset(conf, 0, sizeof(*conf));
3200
3201 /* if changelink operation, start with old existing cfg */
3202 if (changelink)
3203 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3204
3205 if (data[IFLA_VXLAN_ID]) {
3206 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3207
3208 if (changelink && (vni != conf->vni))
3209 return -EOPNOTSUPP;
3210 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3211 }
3212
3213 if (data[IFLA_VXLAN_GROUP]) {
3214 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3215 return -EOPNOTSUPP;
3216
3217 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3218 conf->remote_ip.sa.sa_family = AF_INET;
3219 } else if (data[IFLA_VXLAN_GROUP6]) {
3220 if (!IS_ENABLED(CONFIG_IPV6))
3221 return -EPFNOSUPPORT;
3222
3223 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3224 return -EOPNOTSUPP;
3225
3226 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3227 conf->remote_ip.sa.sa_family = AF_INET6;
3228 }
3229
3230 if (data[IFLA_VXLAN_LOCAL]) {
3231 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3232 return -EOPNOTSUPP;
3233
3234 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3235 conf->saddr.sa.sa_family = AF_INET;
3236 } else if (data[IFLA_VXLAN_LOCAL6]) {
3237 if (!IS_ENABLED(CONFIG_IPV6))
3238 return -EPFNOSUPPORT;
3239
3240 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3241 return -EOPNOTSUPP;
3242
3243 /* TODO: respect scope id */
3244 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3245 conf->saddr.sa.sa_family = AF_INET6;
3246 }
3247
3248 if (data[IFLA_VXLAN_LINK])
3249 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3250
3251 if (data[IFLA_VXLAN_TOS])
3252 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3253
3254 if (data[IFLA_VXLAN_TTL])
3255 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3256
3257 if (data[IFLA_VXLAN_LABEL])
3258 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3259 IPV6_FLOWLABEL_MASK;
3260
3261 if (data[IFLA_VXLAN_LEARNING]) {
3262 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3263 conf->flags |= VXLAN_F_LEARN;
3264 else
3265 conf->flags &= ~VXLAN_F_LEARN;
3266 } else if (!changelink) {
3267 /* default to learn on a new device */
3268 conf->flags |= VXLAN_F_LEARN;
3269 }
3270
3271 if (data[IFLA_VXLAN_AGEING]) {
3272 if (changelink)
3273 return -EOPNOTSUPP;
3274 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3275 }
3276
3277 if (data[IFLA_VXLAN_PROXY]) {
3278 if (changelink)
3279 return -EOPNOTSUPP;
3280 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3281 conf->flags |= VXLAN_F_PROXY;
3282 }
3283
3284 if (data[IFLA_VXLAN_RSC]) {
3285 if (changelink)
3286 return -EOPNOTSUPP;
3287 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3288 conf->flags |= VXLAN_F_RSC;
3289 }
3290
3291 if (data[IFLA_VXLAN_L2MISS]) {
3292 if (changelink)
3293 return -EOPNOTSUPP;
3294 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3295 conf->flags |= VXLAN_F_L2MISS;
3296 }
3297
3298 if (data[IFLA_VXLAN_L3MISS]) {
3299 if (changelink)
3300 return -EOPNOTSUPP;
3301 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3302 conf->flags |= VXLAN_F_L3MISS;
3303 }
3304
3305 if (data[IFLA_VXLAN_LIMIT]) {
3306 if (changelink)
3307 return -EOPNOTSUPP;
3308 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3309 }
3310
3311 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3312 if (changelink)
3313 return -EOPNOTSUPP;
3314 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3315 conf->flags |= VXLAN_F_COLLECT_METADATA;
3316 }
3317
3318 if (data[IFLA_VXLAN_PORT_RANGE]) {
3319 if (!changelink) {
3320 const struct ifla_vxlan_port_range *p
3321 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3322 conf->port_min = ntohs(p->low);
3323 conf->port_max = ntohs(p->high);
3324 } else {
3325 return -EOPNOTSUPP;
3326 }
3327 }
3328
3329 if (data[IFLA_VXLAN_PORT]) {
3330 if (changelink)
3331 return -EOPNOTSUPP;
3332 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3333 }
3334
3335 if (data[IFLA_VXLAN_UDP_CSUM]) {
3336 if (changelink)
3337 return -EOPNOTSUPP;
3338 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3339 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3340 }
3341
3342 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3343 if (changelink)
3344 return -EOPNOTSUPP;
3345 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3346 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3347 }
3348
3349 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3350 if (changelink)
3351 return -EOPNOTSUPP;
3352 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3353 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3354 }
3355
3356 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3357 if (changelink)
3358 return -EOPNOTSUPP;
3359 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3360 conf->flags |= VXLAN_F_REMCSUM_TX;
3361 }
3362
3363 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3364 if (changelink)
3365 return -EOPNOTSUPP;
3366 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3367 conf->flags |= VXLAN_F_REMCSUM_RX;
3368 }
3369
3370 if (data[IFLA_VXLAN_GBP]) {
3371 if (changelink)
3372 return -EOPNOTSUPP;
3373 conf->flags |= VXLAN_F_GBP;
3374 }
3375
3376 if (data[IFLA_VXLAN_GPE]) {
3377 if (changelink)
3378 return -EOPNOTSUPP;
3379 conf->flags |= VXLAN_F_GPE;
3380 }
3381
3382 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3383 if (changelink)
3384 return -EOPNOTSUPP;
3385 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3386 }
3387
3388 if (tb[IFLA_MTU]) {
3389 if (changelink)
3390 return -EOPNOTSUPP;
3391 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3392 }
3393
3394 return 0;
3395}
3396
3397static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3398 struct nlattr *tb[], struct nlattr *data[],
3399 struct netlink_ext_ack *extack)
3400{
3401 struct vxlan_config conf;
3402 int err;
3403
3404 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3405 if (err)
3406 return err;
3407
3408 return __vxlan_dev_create(src_net, dev, &conf, extack);
3409}
3410
3411static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3412 struct nlattr *data[],
3413 struct netlink_ext_ack *extack)
3414{
3415 struct vxlan_dev *vxlan = netdev_priv(dev);
3416 struct vxlan_rdst *dst = &vxlan->default_dst;
3417 struct vxlan_rdst old_dst;
3418 struct vxlan_config conf;
3419 int err;
3420
3421 err = vxlan_nl2conf(tb, data,
3422 dev, &conf, true);
3423 if (err)
3424 return err;
3425
3426 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3427
3428 err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3429 if (err)
3430 return err;
3431
3432 /* handle default dst entry */
3433 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3434 spin_lock_bh(&vxlan->hash_lock);
3435 if (!vxlan_addr_any(&old_dst.remote_ip))
3436 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3437 old_dst.remote_ip,
3438 vxlan->cfg.dst_port,
3439 old_dst.remote_vni,
3440 old_dst.remote_vni,
3441 old_dst.remote_ifindex, 0);
3442
3443 if (!vxlan_addr_any(&dst->remote_ip)) {
3444 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3445 &dst->remote_ip,
3446 NUD_REACHABLE | NUD_PERMANENT,
3447 NLM_F_CREATE | NLM_F_APPEND,
3448 vxlan->cfg.dst_port,
3449 dst->remote_vni,
3450 dst->remote_vni,
3451 dst->remote_ifindex,
3452 NTF_SELF);
3453 if (err) {
3454 spin_unlock_bh(&vxlan->hash_lock);
3455 return err;
3456 }
3457 }
3458 spin_unlock_bh(&vxlan->hash_lock);
3459 }
3460
3461 return 0;
3462}
3463
3464static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3465{
3466 struct vxlan_dev *vxlan = netdev_priv(dev);
3467
3468 vxlan_flush(vxlan, true);
3469
3470 gro_cells_destroy(&vxlan->gro_cells);
3471 list_del(&vxlan->next);
3472 unregister_netdevice_queue(dev, head);
3473}
3474
3475static size_t vxlan_get_size(const struct net_device *dev)
3476{
3477
3478 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3479 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3480 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3481 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3482 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3483 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3484 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3485 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3486 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3487 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3488 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3489 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3490 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3491 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3492 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3493 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3494 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3495 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3496 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3497 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3498 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3499 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3500 0;
3501}
3502
3503static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3504{
3505 const struct vxlan_dev *vxlan = netdev_priv(dev);
3506 const struct vxlan_rdst *dst = &vxlan->default_dst;
3507 struct ifla_vxlan_port_range ports = {
3508 .low = htons(vxlan->cfg.port_min),
3509 .high = htons(vxlan->cfg.port_max),
3510 };
3511
3512 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3513 goto nla_put_failure;
3514
3515 if (!vxlan_addr_any(&dst->remote_ip)) {
3516 if (dst->remote_ip.sa.sa_family == AF_INET) {
3517 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3518 dst->remote_ip.sin.sin_addr.s_addr))
3519 goto nla_put_failure;
3520#if IS_ENABLED(CONFIG_IPV6)
3521 } else {
3522 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3523 &dst->remote_ip.sin6.sin6_addr))
3524 goto nla_put_failure;
3525#endif
3526 }
3527 }
3528
3529 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3530 goto nla_put_failure;
3531
3532 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3533 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3534 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3535 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3536 goto nla_put_failure;
3537#if IS_ENABLED(CONFIG_IPV6)
3538 } else {
3539 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3540 &vxlan->cfg.saddr.sin6.sin6_addr))
3541 goto nla_put_failure;
3542#endif
3543 }
3544 }
3545
3546 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3547 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3548 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3549 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3550 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3551 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3552 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3553 nla_put_u8(skb, IFLA_VXLAN_RSC,
3554 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3555 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3556 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3557 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3558 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3559 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3560 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3561 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3562 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3563 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3564 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3565 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3566 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3567 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3568 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3569 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3570 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3571 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3572 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3573 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3574 goto nla_put_failure;
3575
3576 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3577 goto nla_put_failure;
3578
3579 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3580 nla_put_flag(skb, IFLA_VXLAN_GBP))
3581 goto nla_put_failure;
3582
3583 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3584 nla_put_flag(skb, IFLA_VXLAN_GPE))
3585 goto nla_put_failure;
3586
3587 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3588 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3589 goto nla_put_failure;
3590
3591 return 0;
3592
3593nla_put_failure:
3594 return -EMSGSIZE;
3595}
3596
3597static struct net *vxlan_get_link_net(const struct net_device *dev)
3598{
3599 struct vxlan_dev *vxlan = netdev_priv(dev);
3600
3601 return vxlan->net;
3602}
3603
3604static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3605 .kind = "vxlan",
3606 .maxtype = IFLA_VXLAN_MAX,
3607 .policy = vxlan_policy,
3608 .priv_size = sizeof(struct vxlan_dev),
3609 .setup = vxlan_setup,
3610 .validate = vxlan_validate,
3611 .newlink = vxlan_newlink,
3612 .changelink = vxlan_changelink,
3613 .dellink = vxlan_dellink,
3614 .get_size = vxlan_get_size,
3615 .fill_info = vxlan_fill_info,
3616 .get_link_net = vxlan_get_link_net,
3617};
3618
3619struct net_device *vxlan_dev_create(struct net *net, const char *name,
3620 u8 name_assign_type,
3621 struct vxlan_config *conf)
3622{
3623 struct nlattr *tb[IFLA_MAX + 1];
3624 struct net_device *dev;
3625 int err;
3626
3627 memset(&tb, 0, sizeof(tb));
3628
3629 dev = rtnl_create_link(net, name, name_assign_type,
3630 &vxlan_link_ops, tb);
3631 if (IS_ERR(dev))
3632 return dev;
3633
3634 err = __vxlan_dev_create(net, dev, conf, NULL);
3635 if (err < 0) {
3636 free_netdev(dev);
3637 return ERR_PTR(err);
3638 }
3639
3640 err = rtnl_configure_link(dev, NULL);
3641 if (err < 0) {
3642 LIST_HEAD(list_kill);
3643
3644 vxlan_dellink(dev, &list_kill);
3645 unregister_netdevice_many(&list_kill);
3646 return ERR_PTR(err);
3647 }
3648
3649 return dev;
3650}
3651EXPORT_SYMBOL_GPL(vxlan_dev_create);
3652
3653static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3654 struct net_device *dev)
3655{
3656 struct vxlan_dev *vxlan, *next;
3657 LIST_HEAD(list_kill);
3658
3659 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3660 struct vxlan_rdst *dst = &vxlan->default_dst;
3661
3662 /* In case we created vxlan device with carrier
3663 * and we loose the carrier due to module unload
3664 * we also need to remove vxlan device. In other
3665 * cases, it's not necessary and remote_ifindex
3666 * is 0 here, so no matches.
3667 */
3668 if (dst->remote_ifindex == dev->ifindex)
3669 vxlan_dellink(vxlan->dev, &list_kill);
3670 }
3671
3672 unregister_netdevice_many(&list_kill);
3673}
3674
3675static int vxlan_netdevice_event(struct notifier_block *unused,
3676 unsigned long event, void *ptr)
3677{
3678 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3679 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3680
3681 if (event == NETDEV_UNREGISTER) {
3682 vxlan_offload_rx_ports(dev, false);
3683 vxlan_handle_lowerdev_unregister(vn, dev);
3684 } else if (event == NETDEV_REGISTER) {
3685 vxlan_offload_rx_ports(dev, true);
3686 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3687 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3688 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3689 }
3690
3691 return NOTIFY_DONE;
3692}
3693
3694static struct notifier_block vxlan_notifier_block __read_mostly = {
3695 .notifier_call = vxlan_netdevice_event,
3696};
3697
3698static __net_init int vxlan_init_net(struct net *net)
3699{
3700 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3701 unsigned int h;
3702
3703 INIT_LIST_HEAD(&vn->vxlan_list);
3704 spin_lock_init(&vn->sock_lock);
3705
3706 for (h = 0; h < PORT_HASH_SIZE; ++h)
3707 INIT_HLIST_HEAD(&vn->sock_list[h]);
3708
3709 return 0;
3710}
3711
3712static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
3713{
3714 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3715 struct vxlan_dev *vxlan, *next;
3716 struct net_device *dev, *aux;
3717 unsigned int h;
3718
3719 for_each_netdev_safe(net, dev, aux)
3720 if (dev->rtnl_link_ops == &vxlan_link_ops)
3721 unregister_netdevice_queue(dev, head);
3722
3723 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3724 /* If vxlan->dev is in the same netns, it has already been added
3725 * to the list by the previous loop.
3726 */
3727 if (!net_eq(dev_net(vxlan->dev), net)) {
3728 gro_cells_destroy(&vxlan->gro_cells);
3729 unregister_netdevice_queue(vxlan->dev, head);
3730 }
3731 }
3732
3733 for (h = 0; h < PORT_HASH_SIZE; ++h)
3734 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
3735}
3736
3737static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
3738{
3739 struct net *net;
3740 LIST_HEAD(list);
3741
3742 rtnl_lock();
3743 list_for_each_entry(net, net_list, exit_list)
3744 vxlan_destroy_tunnels(net, &list);
3745
3746 unregister_netdevice_many(&list);
3747 rtnl_unlock();
3748}
3749
3750static struct pernet_operations vxlan_net_ops = {
3751 .init = vxlan_init_net,
3752 .exit_batch = vxlan_exit_batch_net,
3753 .id = &vxlan_net_id,
3754 .size = sizeof(struct vxlan_net),
3755};
3756
3757static int __init vxlan_init_module(void)
3758{
3759 int rc;
3760
3761 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3762
3763 rc = register_pernet_subsys(&vxlan_net_ops);
3764 if (rc)
3765 goto out1;
3766
3767 rc = register_netdevice_notifier(&vxlan_notifier_block);
3768 if (rc)
3769 goto out2;
3770
3771 rc = rtnl_link_register(&vxlan_link_ops);
3772 if (rc)
3773 goto out3;
3774
3775 return 0;
3776out3:
3777 unregister_netdevice_notifier(&vxlan_notifier_block);
3778out2:
3779 unregister_pernet_subsys(&vxlan_net_ops);
3780out1:
3781 return rc;
3782}
3783late_initcall(vxlan_init_module);
3784
3785static void __exit vxlan_cleanup_module(void)
3786{
3787 rtnl_link_unregister(&vxlan_link_ops);
3788 unregister_netdevice_notifier(&vxlan_notifier_block);
3789 unregister_pernet_subsys(&vxlan_net_ops);
3790 /* rcu_barrier() is called by netns */
3791}
3792module_exit(vxlan_cleanup_module);
3793
3794MODULE_LICENSE("GPL");
3795MODULE_VERSION(VXLAN_VERSION);
3796MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3797MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3798MODULE_ALIAS_RTNL_LINK("vxlan");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * VXLAN: Virtual eXtensible Local Area Network
4 *
5 * Copyright (c) 2012-2013 Vyatta Inc.
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/slab.h>
14#include <linux/udp.h>
15#include <linux/igmp.h>
16#include <linux/if_ether.h>
17#include <linux/ethtool.h>
18#include <net/arp.h>
19#include <net/ndisc.h>
20#include <net/ipv6_stubs.h>
21#include <net/ip.h>
22#include <net/icmp.h>
23#include <net/rtnetlink.h>
24#include <net/inet_ecn.h>
25#include <net/net_namespace.h>
26#include <net/netns/generic.h>
27#include <net/tun_proto.h>
28#include <net/vxlan.h>
29
30#if IS_ENABLED(CONFIG_IPV6)
31#include <net/ip6_tunnel.h>
32#include <net/ip6_checksum.h>
33#endif
34
35#define VXLAN_VERSION "0.1"
36
37#define PORT_HASH_BITS 8
38#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
39#define FDB_AGE_DEFAULT 300 /* 5 min */
40#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
41
42/* UDP port for VXLAN traffic.
43 * The IANA assigned port is 4789, but the Linux default is 8472
44 * for compatibility with early adopters.
45 */
46static unsigned short vxlan_port __read_mostly = 8472;
47module_param_named(udp_port, vxlan_port, ushort, 0444);
48MODULE_PARM_DESC(udp_port, "Destination UDP port");
49
50static bool log_ecn_error = true;
51module_param(log_ecn_error, bool, 0644);
52MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
53
54static unsigned int vxlan_net_id;
55static struct rtnl_link_ops vxlan_link_ops;
56
57static const u8 all_zeros_mac[ETH_ALEN + 2];
58
59static int vxlan_sock_add(struct vxlan_dev *vxlan);
60
61static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
62
63/* per-network namespace private data for this module */
64struct vxlan_net {
65 struct list_head vxlan_list;
66 struct hlist_head sock_list[PORT_HASH_SIZE];
67 spinlock_t sock_lock;
68};
69
70/* Forwarding table entry */
71struct vxlan_fdb {
72 struct hlist_node hlist; /* linked list of entries */
73 struct rcu_head rcu;
74 unsigned long updated; /* jiffies */
75 unsigned long used;
76 struct list_head remotes;
77 u8 eth_addr[ETH_ALEN];
78 u16 state; /* see ndm_state */
79 __be32 vni;
80 u16 flags; /* see ndm_flags and below */
81};
82
83#define NTF_VXLAN_ADDED_BY_USER 0x100
84
85/* salt for hash table */
86static u32 vxlan_salt __read_mostly;
87
88static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
89{
90 return vs->flags & VXLAN_F_COLLECT_METADATA ||
91 ip_tunnel_collect_metadata();
92}
93
94#if IS_ENABLED(CONFIG_IPV6)
95static inline
96bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
97{
98 if (a->sa.sa_family != b->sa.sa_family)
99 return false;
100 if (a->sa.sa_family == AF_INET6)
101 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
102 else
103 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
104}
105
106static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
107{
108 if (nla_len(nla) >= sizeof(struct in6_addr)) {
109 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
110 ip->sa.sa_family = AF_INET6;
111 return 0;
112 } else if (nla_len(nla) >= sizeof(__be32)) {
113 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
114 ip->sa.sa_family = AF_INET;
115 return 0;
116 } else {
117 return -EAFNOSUPPORT;
118 }
119}
120
121static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
122 const union vxlan_addr *ip)
123{
124 if (ip->sa.sa_family == AF_INET6)
125 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
126 else
127 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
128}
129
130#else /* !CONFIG_IPV6 */
131
132static inline
133bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
134{
135 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
136}
137
138static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
139{
140 if (nla_len(nla) >= sizeof(struct in6_addr)) {
141 return -EAFNOSUPPORT;
142 } else if (nla_len(nla) >= sizeof(__be32)) {
143 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
144 ip->sa.sa_family = AF_INET;
145 return 0;
146 } else {
147 return -EAFNOSUPPORT;
148 }
149}
150
151static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
152 const union vxlan_addr *ip)
153{
154 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
155}
156#endif
157
158/* Virtual Network hash table head */
159static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
160{
161 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
162}
163
164/* Socket hash table head */
165static inline struct hlist_head *vs_head(struct net *net, __be16 port)
166{
167 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
168
169 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
170}
171
172/* First remote destination for a forwarding entry.
173 * Guaranteed to be non-NULL because remotes are never deleted.
174 */
175static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
176{
177 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
178}
179
180static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
181{
182 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
183}
184
185/* Find VXLAN socket based on network namespace, address family and UDP port
186 * and enabled unshareable flags.
187 */
188static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
189 __be16 port, u32 flags, int ifindex)
190{
191 struct vxlan_sock *vs;
192
193 flags &= VXLAN_F_RCV_FLAGS;
194
195 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
196 if (inet_sk(vs->sock->sk)->inet_sport == port &&
197 vxlan_get_sk_family(vs) == family &&
198 vs->flags == flags &&
199 vs->sock->sk->sk_bound_dev_if == ifindex)
200 return vs;
201 }
202 return NULL;
203}
204
205static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
206 __be32 vni)
207{
208 struct vxlan_dev_node *node;
209
210 /* For flow based devices, map all packets to VNI 0 */
211 if (vs->flags & VXLAN_F_COLLECT_METADATA)
212 vni = 0;
213
214 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
215 if (node->vxlan->default_dst.remote_vni != vni)
216 continue;
217
218 if (IS_ENABLED(CONFIG_IPV6)) {
219 const struct vxlan_config *cfg = &node->vxlan->cfg;
220
221 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
222 cfg->remote_ifindex != ifindex)
223 continue;
224 }
225
226 return node->vxlan;
227 }
228
229 return NULL;
230}
231
232/* Look up VNI in a per net namespace table */
233static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
234 __be32 vni, sa_family_t family,
235 __be16 port, u32 flags)
236{
237 struct vxlan_sock *vs;
238
239 vs = vxlan_find_sock(net, family, port, flags, ifindex);
240 if (!vs)
241 return NULL;
242
243 return vxlan_vs_find_vni(vs, ifindex, vni);
244}
245
246/* Fill in neighbour message in skbuff. */
247static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
248 const struct vxlan_fdb *fdb,
249 u32 portid, u32 seq, int type, unsigned int flags,
250 const struct vxlan_rdst *rdst)
251{
252 unsigned long now = jiffies;
253 struct nda_cacheinfo ci;
254 struct nlmsghdr *nlh;
255 struct ndmsg *ndm;
256 bool send_ip, send_eth;
257
258 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
259 if (nlh == NULL)
260 return -EMSGSIZE;
261
262 ndm = nlmsg_data(nlh);
263 memset(ndm, 0, sizeof(*ndm));
264
265 send_eth = send_ip = true;
266
267 if (type == RTM_GETNEIGH) {
268 send_ip = !vxlan_addr_any(&rdst->remote_ip);
269 send_eth = !is_zero_ether_addr(fdb->eth_addr);
270 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
271 } else
272 ndm->ndm_family = AF_BRIDGE;
273 ndm->ndm_state = fdb->state;
274 ndm->ndm_ifindex = vxlan->dev->ifindex;
275 ndm->ndm_flags = fdb->flags;
276 if (rdst->offloaded)
277 ndm->ndm_flags |= NTF_OFFLOADED;
278 ndm->ndm_type = RTN_UNICAST;
279
280 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
281 nla_put_s32(skb, NDA_LINK_NETNSID,
282 peernet2id(dev_net(vxlan->dev), vxlan->net)))
283 goto nla_put_failure;
284
285 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
286 goto nla_put_failure;
287
288 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
289 goto nla_put_failure;
290
291 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
292 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
293 goto nla_put_failure;
294 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
295 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
296 goto nla_put_failure;
297 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
298 nla_put_u32(skb, NDA_SRC_VNI,
299 be32_to_cpu(fdb->vni)))
300 goto nla_put_failure;
301 if (rdst->remote_ifindex &&
302 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
303 goto nla_put_failure;
304
305 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
306 ci.ndm_confirmed = 0;
307 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
308 ci.ndm_refcnt = 0;
309
310 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
311 goto nla_put_failure;
312
313 nlmsg_end(skb, nlh);
314 return 0;
315
316nla_put_failure:
317 nlmsg_cancel(skb, nlh);
318 return -EMSGSIZE;
319}
320
321static inline size_t vxlan_nlmsg_size(void)
322{
323 return NLMSG_ALIGN(sizeof(struct ndmsg))
324 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
325 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
326 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
327 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
328 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
329 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
330 + nla_total_size(sizeof(struct nda_cacheinfo));
331}
332
333static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
334 struct vxlan_rdst *rd, int type)
335{
336 struct net *net = dev_net(vxlan->dev);
337 struct sk_buff *skb;
338 int err = -ENOBUFS;
339
340 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
341 if (skb == NULL)
342 goto errout;
343
344 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
345 if (err < 0) {
346 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
347 WARN_ON(err == -EMSGSIZE);
348 kfree_skb(skb);
349 goto errout;
350 }
351
352 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
353 return;
354errout:
355 if (err < 0)
356 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
357}
358
359static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
360 const struct vxlan_fdb *fdb,
361 const struct vxlan_rdst *rd,
362 struct netlink_ext_ack *extack,
363 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
364{
365 fdb_info->info.dev = vxlan->dev;
366 fdb_info->info.extack = extack;
367 fdb_info->remote_ip = rd->remote_ip;
368 fdb_info->remote_port = rd->remote_port;
369 fdb_info->remote_vni = rd->remote_vni;
370 fdb_info->remote_ifindex = rd->remote_ifindex;
371 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
372 fdb_info->vni = fdb->vni;
373 fdb_info->offloaded = rd->offloaded;
374 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
375}
376
377static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
378 struct vxlan_fdb *fdb,
379 struct vxlan_rdst *rd,
380 bool adding,
381 struct netlink_ext_ack *extack)
382{
383 struct switchdev_notifier_vxlan_fdb_info info;
384 enum switchdev_notifier_type notifier_type;
385 int ret;
386
387 if (WARN_ON(!rd))
388 return 0;
389
390 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
391 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
392 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
393 ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
394 &info.info, extack);
395 return notifier_to_errno(ret);
396}
397
398static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
399 struct vxlan_rdst *rd, int type, bool swdev_notify,
400 struct netlink_ext_ack *extack)
401{
402 int err;
403
404 if (swdev_notify) {
405 switch (type) {
406 case RTM_NEWNEIGH:
407 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
408 true, extack);
409 if (err)
410 return err;
411 break;
412 case RTM_DELNEIGH:
413 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
414 false, extack);
415 break;
416 }
417 }
418
419 __vxlan_fdb_notify(vxlan, fdb, rd, type);
420 return 0;
421}
422
423static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
424{
425 struct vxlan_dev *vxlan = netdev_priv(dev);
426 struct vxlan_fdb f = {
427 .state = NUD_STALE,
428 };
429 struct vxlan_rdst remote = {
430 .remote_ip = *ipa, /* goes to NDA_DST */
431 .remote_vni = cpu_to_be32(VXLAN_N_VID),
432 };
433
434 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
435}
436
437static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
438{
439 struct vxlan_fdb f = {
440 .state = NUD_STALE,
441 };
442 struct vxlan_rdst remote = { };
443
444 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
445
446 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
447}
448
449/* Hash Ethernet address */
450static u32 eth_hash(const unsigned char *addr)
451{
452 u64 value = get_unaligned((u64 *)addr);
453
454 /* only want 6 bytes */
455#ifdef __BIG_ENDIAN
456 value >>= 16;
457#else
458 value <<= 16;
459#endif
460 return hash_64(value, FDB_HASH_BITS);
461}
462
463static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
464{
465 /* use 1 byte of OUI and 3 bytes of NIC */
466 u32 key = get_unaligned((u32 *)(addr + 2));
467
468 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
469}
470
471static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
472{
473 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
474 return eth_vni_hash(mac, vni);
475 else
476 return eth_hash(mac);
477}
478
479/* Hash chain to use given mac address */
480static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
481 const u8 *mac, __be32 vni)
482{
483 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
484}
485
486/* Look up Ethernet address in forwarding table */
487static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
488 const u8 *mac, __be32 vni)
489{
490 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
491 struct vxlan_fdb *f;
492
493 hlist_for_each_entry_rcu(f, head, hlist) {
494 if (ether_addr_equal(mac, f->eth_addr)) {
495 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
496 if (vni == f->vni)
497 return f;
498 } else {
499 return f;
500 }
501 }
502 }
503
504 return NULL;
505}
506
507static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
508 const u8 *mac, __be32 vni)
509{
510 struct vxlan_fdb *f;
511
512 f = __vxlan_find_mac(vxlan, mac, vni);
513 if (f && f->used != jiffies)
514 f->used = jiffies;
515
516 return f;
517}
518
519/* caller should hold vxlan->hash_lock */
520static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
521 union vxlan_addr *ip, __be16 port,
522 __be32 vni, __u32 ifindex)
523{
524 struct vxlan_rdst *rd;
525
526 list_for_each_entry(rd, &f->remotes, list) {
527 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
528 rd->remote_port == port &&
529 rd->remote_vni == vni &&
530 rd->remote_ifindex == ifindex)
531 return rd;
532 }
533
534 return NULL;
535}
536
537int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
538 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
539{
540 struct vxlan_dev *vxlan = netdev_priv(dev);
541 u8 eth_addr[ETH_ALEN + 2] = { 0 };
542 struct vxlan_rdst *rdst;
543 struct vxlan_fdb *f;
544 int rc = 0;
545
546 if (is_multicast_ether_addr(mac) ||
547 is_zero_ether_addr(mac))
548 return -EINVAL;
549
550 ether_addr_copy(eth_addr, mac);
551
552 rcu_read_lock();
553
554 f = __vxlan_find_mac(vxlan, eth_addr, vni);
555 if (!f) {
556 rc = -ENOENT;
557 goto out;
558 }
559
560 rdst = first_remote_rcu(f);
561 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
562
563out:
564 rcu_read_unlock();
565 return rc;
566}
567EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
568
569static int vxlan_fdb_notify_one(struct notifier_block *nb,
570 const struct vxlan_dev *vxlan,
571 const struct vxlan_fdb *f,
572 const struct vxlan_rdst *rdst,
573 struct netlink_ext_ack *extack)
574{
575 struct switchdev_notifier_vxlan_fdb_info fdb_info;
576 int rc;
577
578 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
579 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
580 &fdb_info);
581 return notifier_to_errno(rc);
582}
583
584int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
585 struct notifier_block *nb,
586 struct netlink_ext_ack *extack)
587{
588 struct vxlan_dev *vxlan;
589 struct vxlan_rdst *rdst;
590 struct vxlan_fdb *f;
591 unsigned int h;
592 int rc = 0;
593
594 if (!netif_is_vxlan(dev))
595 return -EINVAL;
596 vxlan = netdev_priv(dev);
597
598 for (h = 0; h < FDB_HASH_SIZE; ++h) {
599 spin_lock_bh(&vxlan->hash_lock[h]);
600 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
601 if (f->vni == vni) {
602 list_for_each_entry(rdst, &f->remotes, list) {
603 rc = vxlan_fdb_notify_one(nb, vxlan,
604 f, rdst,
605 extack);
606 if (rc)
607 goto unlock;
608 }
609 }
610 }
611 spin_unlock_bh(&vxlan->hash_lock[h]);
612 }
613 return 0;
614
615unlock:
616 spin_unlock_bh(&vxlan->hash_lock[h]);
617 return rc;
618}
619EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
620
621void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
622{
623 struct vxlan_dev *vxlan;
624 struct vxlan_rdst *rdst;
625 struct vxlan_fdb *f;
626 unsigned int h;
627
628 if (!netif_is_vxlan(dev))
629 return;
630 vxlan = netdev_priv(dev);
631
632 for (h = 0; h < FDB_HASH_SIZE; ++h) {
633 spin_lock_bh(&vxlan->hash_lock[h]);
634 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
635 if (f->vni == vni)
636 list_for_each_entry(rdst, &f->remotes, list)
637 rdst->offloaded = false;
638 spin_unlock_bh(&vxlan->hash_lock[h]);
639 }
640
641}
642EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
643
644/* Replace destination of unicast mac */
645static int vxlan_fdb_replace(struct vxlan_fdb *f,
646 union vxlan_addr *ip, __be16 port, __be32 vni,
647 __u32 ifindex, struct vxlan_rdst *oldrd)
648{
649 struct vxlan_rdst *rd;
650
651 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
652 if (rd)
653 return 0;
654
655 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
656 if (!rd)
657 return 0;
658
659 *oldrd = *rd;
660 dst_cache_reset(&rd->dst_cache);
661 rd->remote_ip = *ip;
662 rd->remote_port = port;
663 rd->remote_vni = vni;
664 rd->remote_ifindex = ifindex;
665 rd->offloaded = false;
666 return 1;
667}
668
669/* Add/update destinations for multicast */
670static int vxlan_fdb_append(struct vxlan_fdb *f,
671 union vxlan_addr *ip, __be16 port, __be32 vni,
672 __u32 ifindex, struct vxlan_rdst **rdp)
673{
674 struct vxlan_rdst *rd;
675
676 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
677 if (rd)
678 return 0;
679
680 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
681 if (rd == NULL)
682 return -ENOBUFS;
683
684 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
685 kfree(rd);
686 return -ENOBUFS;
687 }
688
689 rd->remote_ip = *ip;
690 rd->remote_port = port;
691 rd->offloaded = false;
692 rd->remote_vni = vni;
693 rd->remote_ifindex = ifindex;
694
695 list_add_tail_rcu(&rd->list, &f->remotes);
696
697 *rdp = rd;
698 return 1;
699}
700
701static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
702 unsigned int off,
703 struct vxlanhdr *vh, size_t hdrlen,
704 __be32 vni_field,
705 struct gro_remcsum *grc,
706 bool nopartial)
707{
708 size_t start, offset;
709
710 if (skb->remcsum_offload)
711 return vh;
712
713 if (!NAPI_GRO_CB(skb)->csum_valid)
714 return NULL;
715
716 start = vxlan_rco_start(vni_field);
717 offset = start + vxlan_rco_offset(vni_field);
718
719 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
720 start, offset, grc, nopartial);
721
722 skb->remcsum_offload = 1;
723
724 return vh;
725}
726
727static struct sk_buff *vxlan_gro_receive(struct sock *sk,
728 struct list_head *head,
729 struct sk_buff *skb)
730{
731 struct sk_buff *pp = NULL;
732 struct sk_buff *p;
733 struct vxlanhdr *vh, *vh2;
734 unsigned int hlen, off_vx;
735 int flush = 1;
736 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
737 __be32 flags;
738 struct gro_remcsum grc;
739
740 skb_gro_remcsum_init(&grc);
741
742 off_vx = skb_gro_offset(skb);
743 hlen = off_vx + sizeof(*vh);
744 vh = skb_gro_header_fast(skb, off_vx);
745 if (skb_gro_header_hard(skb, hlen)) {
746 vh = skb_gro_header_slow(skb, hlen, off_vx);
747 if (unlikely(!vh))
748 goto out;
749 }
750
751 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
752
753 flags = vh->vx_flags;
754
755 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
756 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
757 vh->vx_vni, &grc,
758 !!(vs->flags &
759 VXLAN_F_REMCSUM_NOPARTIAL));
760
761 if (!vh)
762 goto out;
763 }
764
765 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
766
767 list_for_each_entry(p, head, list) {
768 if (!NAPI_GRO_CB(p)->same_flow)
769 continue;
770
771 vh2 = (struct vxlanhdr *)(p->data + off_vx);
772 if (vh->vx_flags != vh2->vx_flags ||
773 vh->vx_vni != vh2->vx_vni) {
774 NAPI_GRO_CB(p)->same_flow = 0;
775 continue;
776 }
777 }
778
779 pp = call_gro_receive(eth_gro_receive, head, skb);
780 flush = 0;
781
782out:
783 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
784
785 return pp;
786}
787
788static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
789{
790 /* Sets 'skb->inner_mac_header' since we are always called with
791 * 'skb->encapsulation' set.
792 */
793 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
794}
795
796static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
797 const u8 *mac, __u16 state,
798 __be32 src_vni, __u16 ndm_flags)
799{
800 struct vxlan_fdb *f;
801
802 f = kmalloc(sizeof(*f), GFP_ATOMIC);
803 if (!f)
804 return NULL;
805 f->state = state;
806 f->flags = ndm_flags;
807 f->updated = f->used = jiffies;
808 f->vni = src_vni;
809 INIT_LIST_HEAD(&f->remotes);
810 memcpy(f->eth_addr, mac, ETH_ALEN);
811
812 return f;
813}
814
815static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
816 __be32 src_vni, struct vxlan_fdb *f)
817{
818 ++vxlan->addrcnt;
819 hlist_add_head_rcu(&f->hlist,
820 vxlan_fdb_head(vxlan, mac, src_vni));
821}
822
823static int vxlan_fdb_create(struct vxlan_dev *vxlan,
824 const u8 *mac, union vxlan_addr *ip,
825 __u16 state, __be16 port, __be32 src_vni,
826 __be32 vni, __u32 ifindex, __u16 ndm_flags,
827 struct vxlan_fdb **fdb)
828{
829 struct vxlan_rdst *rd = NULL;
830 struct vxlan_fdb *f;
831 int rc;
832
833 if (vxlan->cfg.addrmax &&
834 vxlan->addrcnt >= vxlan->cfg.addrmax)
835 return -ENOSPC;
836
837 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
838 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
839 if (!f)
840 return -ENOMEM;
841
842 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
843 if (rc < 0) {
844 kfree(f);
845 return rc;
846 }
847
848 *fdb = f;
849
850 return 0;
851}
852
853static void __vxlan_fdb_free(struct vxlan_fdb *f)
854{
855 struct vxlan_rdst *rd, *nd;
856
857 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
858 dst_cache_destroy(&rd->dst_cache);
859 kfree(rd);
860 }
861 kfree(f);
862}
863
864static void vxlan_fdb_free(struct rcu_head *head)
865{
866 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
867
868 __vxlan_fdb_free(f);
869}
870
871static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
872 bool do_notify, bool swdev_notify)
873{
874 struct vxlan_rdst *rd;
875
876 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
877
878 --vxlan->addrcnt;
879 if (do_notify)
880 list_for_each_entry(rd, &f->remotes, list)
881 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
882 swdev_notify, NULL);
883
884 hlist_del_rcu(&f->hlist);
885 call_rcu(&f->rcu, vxlan_fdb_free);
886}
887
888static void vxlan_dst_free(struct rcu_head *head)
889{
890 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
891
892 dst_cache_destroy(&rd->dst_cache);
893 kfree(rd);
894}
895
896static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
897 union vxlan_addr *ip,
898 __u16 state, __u16 flags,
899 __be16 port, __be32 vni,
900 __u32 ifindex, __u16 ndm_flags,
901 struct vxlan_fdb *f,
902 bool swdev_notify,
903 struct netlink_ext_ack *extack)
904{
905 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
906 struct vxlan_rdst *rd = NULL;
907 struct vxlan_rdst oldrd;
908 int notify = 0;
909 int rc = 0;
910 int err;
911
912 /* Do not allow an externally learned entry to take over an entry added
913 * by the user.
914 */
915 if (!(fdb_flags & NTF_EXT_LEARNED) ||
916 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
917 if (f->state != state) {
918 f->state = state;
919 f->updated = jiffies;
920 notify = 1;
921 }
922 if (f->flags != fdb_flags) {
923 f->flags = fdb_flags;
924 f->updated = jiffies;
925 notify = 1;
926 }
927 }
928
929 if ((flags & NLM_F_REPLACE)) {
930 /* Only change unicasts */
931 if (!(is_multicast_ether_addr(f->eth_addr) ||
932 is_zero_ether_addr(f->eth_addr))) {
933 rc = vxlan_fdb_replace(f, ip, port, vni,
934 ifindex, &oldrd);
935 notify |= rc;
936 } else {
937 return -EOPNOTSUPP;
938 }
939 }
940 if ((flags & NLM_F_APPEND) &&
941 (is_multicast_ether_addr(f->eth_addr) ||
942 is_zero_ether_addr(f->eth_addr))) {
943 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
944
945 if (rc < 0)
946 return rc;
947 notify |= rc;
948 }
949
950 if (ndm_flags & NTF_USE)
951 f->used = jiffies;
952
953 if (notify) {
954 if (rd == NULL)
955 rd = first_remote_rtnl(f);
956
957 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
958 swdev_notify, extack);
959 if (err)
960 goto err_notify;
961 }
962
963 return 0;
964
965err_notify:
966 if ((flags & NLM_F_REPLACE) && rc)
967 *rd = oldrd;
968 else if ((flags & NLM_F_APPEND) && rc) {
969 list_del_rcu(&rd->list);
970 call_rcu(&rd->rcu, vxlan_dst_free);
971 }
972 return err;
973}
974
975static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
976 const u8 *mac, union vxlan_addr *ip,
977 __u16 state, __u16 flags,
978 __be16 port, __be32 src_vni, __be32 vni,
979 __u32 ifindex, __u16 ndm_flags,
980 bool swdev_notify,
981 struct netlink_ext_ack *extack)
982{
983 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
984 struct vxlan_fdb *f;
985 int rc;
986
987 /* Disallow replace to add a multicast entry */
988 if ((flags & NLM_F_REPLACE) &&
989 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
990 return -EOPNOTSUPP;
991
992 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
993 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
994 vni, ifindex, fdb_flags, &f);
995 if (rc < 0)
996 return rc;
997
998 vxlan_fdb_insert(vxlan, mac, src_vni, f);
999 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1000 swdev_notify, extack);
1001 if (rc)
1002 goto err_notify;
1003
1004 return 0;
1005
1006err_notify:
1007 vxlan_fdb_destroy(vxlan, f, false, false);
1008 return rc;
1009}
1010
1011/* Add new entry to forwarding table -- assumes lock held */
1012static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1013 const u8 *mac, union vxlan_addr *ip,
1014 __u16 state, __u16 flags,
1015 __be16 port, __be32 src_vni, __be32 vni,
1016 __u32 ifindex, __u16 ndm_flags,
1017 bool swdev_notify,
1018 struct netlink_ext_ack *extack)
1019{
1020 struct vxlan_fdb *f;
1021
1022 f = __vxlan_find_mac(vxlan, mac, src_vni);
1023 if (f) {
1024 if (flags & NLM_F_EXCL) {
1025 netdev_dbg(vxlan->dev,
1026 "lost race to create %pM\n", mac);
1027 return -EEXIST;
1028 }
1029
1030 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1031 vni, ifindex, ndm_flags, f,
1032 swdev_notify, extack);
1033 } else {
1034 if (!(flags & NLM_F_CREATE))
1035 return -ENOENT;
1036
1037 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1038 port, src_vni, vni, ifindex,
1039 ndm_flags, swdev_notify, extack);
1040 }
1041}
1042
1043static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1044 struct vxlan_rdst *rd, bool swdev_notify)
1045{
1046 list_del_rcu(&rd->list);
1047 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1048 call_rcu(&rd->rcu, vxlan_dst_free);
1049}
1050
1051static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1052 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1053 __be32 *vni, u32 *ifindex)
1054{
1055 struct net *net = dev_net(vxlan->dev);
1056 int err;
1057
1058 if (tb[NDA_DST]) {
1059 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1060 if (err)
1061 return err;
1062 } else {
1063 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1064 if (remote->sa.sa_family == AF_INET) {
1065 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1066 ip->sa.sa_family = AF_INET;
1067#if IS_ENABLED(CONFIG_IPV6)
1068 } else {
1069 ip->sin6.sin6_addr = in6addr_any;
1070 ip->sa.sa_family = AF_INET6;
1071#endif
1072 }
1073 }
1074
1075 if (tb[NDA_PORT]) {
1076 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1077 return -EINVAL;
1078 *port = nla_get_be16(tb[NDA_PORT]);
1079 } else {
1080 *port = vxlan->cfg.dst_port;
1081 }
1082
1083 if (tb[NDA_VNI]) {
1084 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1085 return -EINVAL;
1086 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1087 } else {
1088 *vni = vxlan->default_dst.remote_vni;
1089 }
1090
1091 if (tb[NDA_SRC_VNI]) {
1092 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1093 return -EINVAL;
1094 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1095 } else {
1096 *src_vni = vxlan->default_dst.remote_vni;
1097 }
1098
1099 if (tb[NDA_IFINDEX]) {
1100 struct net_device *tdev;
1101
1102 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1103 return -EINVAL;
1104 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1105 tdev = __dev_get_by_index(net, *ifindex);
1106 if (!tdev)
1107 return -EADDRNOTAVAIL;
1108 } else {
1109 *ifindex = 0;
1110 }
1111
1112 return 0;
1113}
1114
1115/* Add static entry (via netlink) */
1116static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1117 struct net_device *dev,
1118 const unsigned char *addr, u16 vid, u16 flags,
1119 struct netlink_ext_ack *extack)
1120{
1121 struct vxlan_dev *vxlan = netdev_priv(dev);
1122 /* struct net *net = dev_net(vxlan->dev); */
1123 union vxlan_addr ip;
1124 __be16 port;
1125 __be32 src_vni, vni;
1126 u32 ifindex;
1127 u32 hash_index;
1128 int err;
1129
1130 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1131 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1132 ndm->ndm_state);
1133 return -EINVAL;
1134 }
1135
1136 if (tb[NDA_DST] == NULL)
1137 return -EINVAL;
1138
1139 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1140 if (err)
1141 return err;
1142
1143 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1144 return -EAFNOSUPPORT;
1145
1146 hash_index = fdb_head_index(vxlan, addr, src_vni);
1147 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1148 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1149 port, src_vni, vni, ifindex,
1150 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1151 true, extack);
1152 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1153
1154 return err;
1155}
1156
1157static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1158 const unsigned char *addr, union vxlan_addr ip,
1159 __be16 port, __be32 src_vni, __be32 vni,
1160 u32 ifindex, bool swdev_notify)
1161{
1162 struct vxlan_fdb *f;
1163 struct vxlan_rdst *rd = NULL;
1164 int err = -ENOENT;
1165
1166 f = vxlan_find_mac(vxlan, addr, src_vni);
1167 if (!f)
1168 return err;
1169
1170 if (!vxlan_addr_any(&ip)) {
1171 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1172 if (!rd)
1173 goto out;
1174 }
1175
1176 /* remove a destination if it's not the only one on the list,
1177 * otherwise destroy the fdb entry
1178 */
1179 if (rd && !list_is_singular(&f->remotes)) {
1180 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1181 goto out;
1182 }
1183
1184 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1185
1186out:
1187 return 0;
1188}
1189
1190/* Delete entry (via netlink) */
1191static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1192 struct net_device *dev,
1193 const unsigned char *addr, u16 vid)
1194{
1195 struct vxlan_dev *vxlan = netdev_priv(dev);
1196 union vxlan_addr ip;
1197 __be32 src_vni, vni;
1198 __be16 port;
1199 u32 ifindex;
1200 u32 hash_index;
1201 int err;
1202
1203 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1204 if (err)
1205 return err;
1206
1207 hash_index = fdb_head_index(vxlan, addr, src_vni);
1208 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1209 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1210 true);
1211 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1212
1213 return err;
1214}
1215
1216/* Dump forwarding table */
1217static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1218 struct net_device *dev,
1219 struct net_device *filter_dev, int *idx)
1220{
1221 struct vxlan_dev *vxlan = netdev_priv(dev);
1222 unsigned int h;
1223 int err = 0;
1224
1225 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1226 struct vxlan_fdb *f;
1227
1228 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1229 struct vxlan_rdst *rd;
1230
1231 list_for_each_entry_rcu(rd, &f->remotes, list) {
1232 if (*idx < cb->args[2])
1233 goto skip;
1234
1235 err = vxlan_fdb_info(skb, vxlan, f,
1236 NETLINK_CB(cb->skb).portid,
1237 cb->nlh->nlmsg_seq,
1238 RTM_NEWNEIGH,
1239 NLM_F_MULTI, rd);
1240 if (err < 0)
1241 goto out;
1242skip:
1243 *idx += 1;
1244 }
1245 }
1246 }
1247out:
1248 return err;
1249}
1250
1251static int vxlan_fdb_get(struct sk_buff *skb,
1252 struct nlattr *tb[],
1253 struct net_device *dev,
1254 const unsigned char *addr,
1255 u16 vid, u32 portid, u32 seq,
1256 struct netlink_ext_ack *extack)
1257{
1258 struct vxlan_dev *vxlan = netdev_priv(dev);
1259 struct vxlan_fdb *f;
1260 __be32 vni;
1261 int err;
1262
1263 if (tb[NDA_VNI])
1264 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1265 else
1266 vni = vxlan->default_dst.remote_vni;
1267
1268 rcu_read_lock();
1269
1270 f = __vxlan_find_mac(vxlan, addr, vni);
1271 if (!f) {
1272 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1273 err = -ENOENT;
1274 goto errout;
1275 }
1276
1277 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1278 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1279errout:
1280 rcu_read_unlock();
1281 return err;
1282}
1283
1284/* Watch incoming packets to learn mapping between Ethernet address
1285 * and Tunnel endpoint.
1286 * Return true if packet is bogus and should be dropped.
1287 */
1288static bool vxlan_snoop(struct net_device *dev,
1289 union vxlan_addr *src_ip, const u8 *src_mac,
1290 u32 src_ifindex, __be32 vni)
1291{
1292 struct vxlan_dev *vxlan = netdev_priv(dev);
1293 struct vxlan_fdb *f;
1294 u32 ifindex = 0;
1295
1296#if IS_ENABLED(CONFIG_IPV6)
1297 if (src_ip->sa.sa_family == AF_INET6 &&
1298 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1299 ifindex = src_ifindex;
1300#endif
1301
1302 f = vxlan_find_mac(vxlan, src_mac, vni);
1303 if (likely(f)) {
1304 struct vxlan_rdst *rdst = first_remote_rcu(f);
1305
1306 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1307 rdst->remote_ifindex == ifindex))
1308 return false;
1309
1310 /* Don't migrate static entries, drop packets */
1311 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1312 return true;
1313
1314 if (net_ratelimit())
1315 netdev_info(dev,
1316 "%pM migrated from %pIS to %pIS\n",
1317 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1318
1319 rdst->remote_ip = *src_ip;
1320 f->updated = jiffies;
1321 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1322 } else {
1323 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1324
1325 /* learned new entry */
1326 spin_lock(&vxlan->hash_lock[hash_index]);
1327
1328 /* close off race between vxlan_flush and incoming packets */
1329 if (netif_running(dev))
1330 vxlan_fdb_update(vxlan, src_mac, src_ip,
1331 NUD_REACHABLE,
1332 NLM_F_EXCL|NLM_F_CREATE,
1333 vxlan->cfg.dst_port,
1334 vni,
1335 vxlan->default_dst.remote_vni,
1336 ifindex, NTF_SELF, true, NULL);
1337 spin_unlock(&vxlan->hash_lock[hash_index]);
1338 }
1339
1340 return false;
1341}
1342
1343/* See if multicast group is already in use by other ID */
1344static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1345{
1346 struct vxlan_dev *vxlan;
1347 struct vxlan_sock *sock4;
1348#if IS_ENABLED(CONFIG_IPV6)
1349 struct vxlan_sock *sock6;
1350#endif
1351 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1352
1353 sock4 = rtnl_dereference(dev->vn4_sock);
1354
1355 /* The vxlan_sock is only used by dev, leaving group has
1356 * no effect on other vxlan devices.
1357 */
1358 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1359 return false;
1360#if IS_ENABLED(CONFIG_IPV6)
1361 sock6 = rtnl_dereference(dev->vn6_sock);
1362 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1363 return false;
1364#endif
1365
1366 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1367 if (!netif_running(vxlan->dev) || vxlan == dev)
1368 continue;
1369
1370 if (family == AF_INET &&
1371 rtnl_dereference(vxlan->vn4_sock) != sock4)
1372 continue;
1373#if IS_ENABLED(CONFIG_IPV6)
1374 if (family == AF_INET6 &&
1375 rtnl_dereference(vxlan->vn6_sock) != sock6)
1376 continue;
1377#endif
1378
1379 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1380 &dev->default_dst.remote_ip))
1381 continue;
1382
1383 if (vxlan->default_dst.remote_ifindex !=
1384 dev->default_dst.remote_ifindex)
1385 continue;
1386
1387 return true;
1388 }
1389
1390 return false;
1391}
1392
1393static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1394{
1395 struct vxlan_net *vn;
1396
1397 if (!vs)
1398 return false;
1399 if (!refcount_dec_and_test(&vs->refcnt))
1400 return false;
1401
1402 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1403 spin_lock(&vn->sock_lock);
1404 hlist_del_rcu(&vs->hlist);
1405 udp_tunnel_notify_del_rx_port(vs->sock,
1406 (vs->flags & VXLAN_F_GPE) ?
1407 UDP_TUNNEL_TYPE_VXLAN_GPE :
1408 UDP_TUNNEL_TYPE_VXLAN);
1409 spin_unlock(&vn->sock_lock);
1410
1411 return true;
1412}
1413
1414static void vxlan_sock_release(struct vxlan_dev *vxlan)
1415{
1416 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1417#if IS_ENABLED(CONFIG_IPV6)
1418 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1419
1420 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1421#endif
1422
1423 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1424 synchronize_net();
1425
1426 vxlan_vs_del_dev(vxlan);
1427
1428 if (__vxlan_sock_release_prep(sock4)) {
1429 udp_tunnel_sock_release(sock4->sock);
1430 kfree(sock4);
1431 }
1432
1433#if IS_ENABLED(CONFIG_IPV6)
1434 if (__vxlan_sock_release_prep(sock6)) {
1435 udp_tunnel_sock_release(sock6->sock);
1436 kfree(sock6);
1437 }
1438#endif
1439}
1440
1441/* Update multicast group membership when first VNI on
1442 * multicast address is brought up
1443 */
1444static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1445{
1446 struct sock *sk;
1447 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1448 int ifindex = vxlan->default_dst.remote_ifindex;
1449 int ret = -EINVAL;
1450
1451 if (ip->sa.sa_family == AF_INET) {
1452 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1453 struct ip_mreqn mreq = {
1454 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1455 .imr_ifindex = ifindex,
1456 };
1457
1458 sk = sock4->sock->sk;
1459 lock_sock(sk);
1460 ret = ip_mc_join_group(sk, &mreq);
1461 release_sock(sk);
1462#if IS_ENABLED(CONFIG_IPV6)
1463 } else {
1464 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1465
1466 sk = sock6->sock->sk;
1467 lock_sock(sk);
1468 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1469 &ip->sin6.sin6_addr);
1470 release_sock(sk);
1471#endif
1472 }
1473
1474 return ret;
1475}
1476
1477/* Inverse of vxlan_igmp_join when last VNI is brought down */
1478static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1479{
1480 struct sock *sk;
1481 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1482 int ifindex = vxlan->default_dst.remote_ifindex;
1483 int ret = -EINVAL;
1484
1485 if (ip->sa.sa_family == AF_INET) {
1486 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1487 struct ip_mreqn mreq = {
1488 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1489 .imr_ifindex = ifindex,
1490 };
1491
1492 sk = sock4->sock->sk;
1493 lock_sock(sk);
1494 ret = ip_mc_leave_group(sk, &mreq);
1495 release_sock(sk);
1496#if IS_ENABLED(CONFIG_IPV6)
1497 } else {
1498 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1499
1500 sk = sock6->sock->sk;
1501 lock_sock(sk);
1502 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1503 &ip->sin6.sin6_addr);
1504 release_sock(sk);
1505#endif
1506 }
1507
1508 return ret;
1509}
1510
1511static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1512 struct sk_buff *skb, u32 vxflags)
1513{
1514 size_t start, offset;
1515
1516 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1517 goto out;
1518
1519 start = vxlan_rco_start(unparsed->vx_vni);
1520 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1521
1522 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1523 return false;
1524
1525 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1526 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1527out:
1528 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1529 unparsed->vx_vni &= VXLAN_VNI_MASK;
1530 return true;
1531}
1532
1533static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1534 struct sk_buff *skb, u32 vxflags,
1535 struct vxlan_metadata *md)
1536{
1537 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1538 struct metadata_dst *tun_dst;
1539
1540 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1541 goto out;
1542
1543 md->gbp = ntohs(gbp->policy_id);
1544
1545 tun_dst = (struct metadata_dst *)skb_dst(skb);
1546 if (tun_dst) {
1547 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1548 tun_dst->u.tun_info.options_len = sizeof(*md);
1549 }
1550 if (gbp->dont_learn)
1551 md->gbp |= VXLAN_GBP_DONT_LEARN;
1552
1553 if (gbp->policy_applied)
1554 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1555
1556 /* In flow-based mode, GBP is carried in dst_metadata */
1557 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1558 skb->mark = md->gbp;
1559out:
1560 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1561}
1562
1563static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1564 __be16 *protocol,
1565 struct sk_buff *skb, u32 vxflags)
1566{
1567 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1568
1569 /* Need to have Next Protocol set for interfaces in GPE mode. */
1570 if (!gpe->np_applied)
1571 return false;
1572 /* "The initial version is 0. If a receiver does not support the
1573 * version indicated it MUST drop the packet.
1574 */
1575 if (gpe->version != 0)
1576 return false;
1577 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1578 * processing MUST occur." However, we don't implement OAM
1579 * processing, thus drop the packet.
1580 */
1581 if (gpe->oam_flag)
1582 return false;
1583
1584 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1585 if (!*protocol)
1586 return false;
1587
1588 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1589 return true;
1590}
1591
1592static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1593 struct vxlan_sock *vs,
1594 struct sk_buff *skb, __be32 vni)
1595{
1596 union vxlan_addr saddr;
1597 u32 ifindex = skb->dev->ifindex;
1598
1599 skb_reset_mac_header(skb);
1600 skb->protocol = eth_type_trans(skb, vxlan->dev);
1601 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1602
1603 /* Ignore packet loops (and multicast echo) */
1604 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1605 return false;
1606
1607 /* Get address from the outer IP header */
1608 if (vxlan_get_sk_family(vs) == AF_INET) {
1609 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1610 saddr.sa.sa_family = AF_INET;
1611#if IS_ENABLED(CONFIG_IPV6)
1612 } else {
1613 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1614 saddr.sa.sa_family = AF_INET6;
1615#endif
1616 }
1617
1618 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1619 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1620 return false;
1621
1622 return true;
1623}
1624
1625static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1626 struct sk_buff *skb)
1627{
1628 int err = 0;
1629
1630 if (vxlan_get_sk_family(vs) == AF_INET)
1631 err = IP_ECN_decapsulate(oiph, skb);
1632#if IS_ENABLED(CONFIG_IPV6)
1633 else
1634 err = IP6_ECN_decapsulate(oiph, skb);
1635#endif
1636
1637 if (unlikely(err) && log_ecn_error) {
1638 if (vxlan_get_sk_family(vs) == AF_INET)
1639 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1640 &((struct iphdr *)oiph)->saddr,
1641 ((struct iphdr *)oiph)->tos);
1642 else
1643 net_info_ratelimited("non-ECT from %pI6\n",
1644 &((struct ipv6hdr *)oiph)->saddr);
1645 }
1646 return err <= 1;
1647}
1648
1649/* Callback from net/ipv4/udp.c to receive packets */
1650static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1651{
1652 struct pcpu_sw_netstats *stats;
1653 struct vxlan_dev *vxlan;
1654 struct vxlan_sock *vs;
1655 struct vxlanhdr unparsed;
1656 struct vxlan_metadata _md;
1657 struct vxlan_metadata *md = &_md;
1658 __be16 protocol = htons(ETH_P_TEB);
1659 bool raw_proto = false;
1660 void *oiph;
1661 __be32 vni = 0;
1662
1663 /* Need UDP and VXLAN header to be present */
1664 if (!pskb_may_pull(skb, VXLAN_HLEN))
1665 goto drop;
1666
1667 unparsed = *vxlan_hdr(skb);
1668 /* VNI flag always required to be set */
1669 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1670 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1671 ntohl(vxlan_hdr(skb)->vx_flags),
1672 ntohl(vxlan_hdr(skb)->vx_vni));
1673 /* Return non vxlan pkt */
1674 goto drop;
1675 }
1676 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1677 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1678
1679 vs = rcu_dereference_sk_user_data(sk);
1680 if (!vs)
1681 goto drop;
1682
1683 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1684
1685 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1686 if (!vxlan)
1687 goto drop;
1688
1689 /* For backwards compatibility, only allow reserved fields to be
1690 * used by VXLAN extensions if explicitly requested.
1691 */
1692 if (vs->flags & VXLAN_F_GPE) {
1693 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1694 goto drop;
1695 raw_proto = true;
1696 }
1697
1698 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1699 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1700 goto drop;
1701
1702 if (vxlan_collect_metadata(vs)) {
1703 struct metadata_dst *tun_dst;
1704
1705 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1706 key32_to_tunnel_id(vni), sizeof(*md));
1707
1708 if (!tun_dst)
1709 goto drop;
1710
1711 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1712
1713 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1714 } else {
1715 memset(md, 0, sizeof(*md));
1716 }
1717
1718 if (vs->flags & VXLAN_F_REMCSUM_RX)
1719 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1720 goto drop;
1721 if (vs->flags & VXLAN_F_GBP)
1722 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1723 /* Note that GBP and GPE can never be active together. This is
1724 * ensured in vxlan_dev_configure.
1725 */
1726
1727 if (unparsed.vx_flags || unparsed.vx_vni) {
1728 /* If there are any unprocessed flags remaining treat
1729 * this as a malformed packet. This behavior diverges from
1730 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1731 * in reserved fields are to be ignored. The approach here
1732 * maintains compatibility with previous stack code, and also
1733 * is more robust and provides a little more security in
1734 * adding extensions to VXLAN.
1735 */
1736 goto drop;
1737 }
1738
1739 if (!raw_proto) {
1740 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1741 goto drop;
1742 } else {
1743 skb_reset_mac_header(skb);
1744 skb->dev = vxlan->dev;
1745 skb->pkt_type = PACKET_HOST;
1746 }
1747
1748 oiph = skb_network_header(skb);
1749 skb_reset_network_header(skb);
1750
1751 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1752 ++vxlan->dev->stats.rx_frame_errors;
1753 ++vxlan->dev->stats.rx_errors;
1754 goto drop;
1755 }
1756
1757 rcu_read_lock();
1758
1759 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1760 rcu_read_unlock();
1761 atomic_long_inc(&vxlan->dev->rx_dropped);
1762 goto drop;
1763 }
1764
1765 stats = this_cpu_ptr(vxlan->dev->tstats);
1766 u64_stats_update_begin(&stats->syncp);
1767 stats->rx_packets++;
1768 stats->rx_bytes += skb->len;
1769 u64_stats_update_end(&stats->syncp);
1770
1771 gro_cells_receive(&vxlan->gro_cells, skb);
1772
1773 rcu_read_unlock();
1774
1775 return 0;
1776
1777drop:
1778 /* Consume bad packet */
1779 kfree_skb(skb);
1780 return 0;
1781}
1782
1783/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1784static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1785{
1786 struct vxlan_dev *vxlan;
1787 struct vxlan_sock *vs;
1788 struct vxlanhdr *hdr;
1789 __be32 vni;
1790
1791 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1792 return -EINVAL;
1793
1794 hdr = vxlan_hdr(skb);
1795
1796 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1797 return -EINVAL;
1798
1799 vs = rcu_dereference_sk_user_data(sk);
1800 if (!vs)
1801 return -ENOENT;
1802
1803 vni = vxlan_vni(hdr->vx_vni);
1804 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1805 if (!vxlan)
1806 return -ENOENT;
1807
1808 return 0;
1809}
1810
1811static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1812{
1813 struct vxlan_dev *vxlan = netdev_priv(dev);
1814 struct arphdr *parp;
1815 u8 *arpptr, *sha;
1816 __be32 sip, tip;
1817 struct neighbour *n;
1818
1819 if (dev->flags & IFF_NOARP)
1820 goto out;
1821
1822 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1823 dev->stats.tx_dropped++;
1824 goto out;
1825 }
1826 parp = arp_hdr(skb);
1827
1828 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1829 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1830 parp->ar_pro != htons(ETH_P_IP) ||
1831 parp->ar_op != htons(ARPOP_REQUEST) ||
1832 parp->ar_hln != dev->addr_len ||
1833 parp->ar_pln != 4)
1834 goto out;
1835 arpptr = (u8 *)parp + sizeof(struct arphdr);
1836 sha = arpptr;
1837 arpptr += dev->addr_len; /* sha */
1838 memcpy(&sip, arpptr, sizeof(sip));
1839 arpptr += sizeof(sip);
1840 arpptr += dev->addr_len; /* tha */
1841 memcpy(&tip, arpptr, sizeof(tip));
1842
1843 if (ipv4_is_loopback(tip) ||
1844 ipv4_is_multicast(tip))
1845 goto out;
1846
1847 n = neigh_lookup(&arp_tbl, &tip, dev);
1848
1849 if (n) {
1850 struct vxlan_fdb *f;
1851 struct sk_buff *reply;
1852
1853 if (!(n->nud_state & NUD_CONNECTED)) {
1854 neigh_release(n);
1855 goto out;
1856 }
1857
1858 f = vxlan_find_mac(vxlan, n->ha, vni);
1859 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1860 /* bridge-local neighbor */
1861 neigh_release(n);
1862 goto out;
1863 }
1864
1865 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1866 n->ha, sha);
1867
1868 neigh_release(n);
1869
1870 if (reply == NULL)
1871 goto out;
1872
1873 skb_reset_mac_header(reply);
1874 __skb_pull(reply, skb_network_offset(reply));
1875 reply->ip_summed = CHECKSUM_UNNECESSARY;
1876 reply->pkt_type = PACKET_HOST;
1877
1878 if (netif_rx_ni(reply) == NET_RX_DROP)
1879 dev->stats.rx_dropped++;
1880 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1881 union vxlan_addr ipa = {
1882 .sin.sin_addr.s_addr = tip,
1883 .sin.sin_family = AF_INET,
1884 };
1885
1886 vxlan_ip_miss(dev, &ipa);
1887 }
1888out:
1889 consume_skb(skb);
1890 return NETDEV_TX_OK;
1891}
1892
1893#if IS_ENABLED(CONFIG_IPV6)
1894static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1895 struct neighbour *n, bool isrouter)
1896{
1897 struct net_device *dev = request->dev;
1898 struct sk_buff *reply;
1899 struct nd_msg *ns, *na;
1900 struct ipv6hdr *pip6;
1901 u8 *daddr;
1902 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1903 int ns_olen;
1904 int i, len;
1905
1906 if (dev == NULL || !pskb_may_pull(request, request->len))
1907 return NULL;
1908
1909 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1910 sizeof(*na) + na_olen + dev->needed_tailroom;
1911 reply = alloc_skb(len, GFP_ATOMIC);
1912 if (reply == NULL)
1913 return NULL;
1914
1915 reply->protocol = htons(ETH_P_IPV6);
1916 reply->dev = dev;
1917 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1918 skb_push(reply, sizeof(struct ethhdr));
1919 skb_reset_mac_header(reply);
1920
1921 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1922
1923 daddr = eth_hdr(request)->h_source;
1924 ns_olen = request->len - skb_network_offset(request) -
1925 sizeof(struct ipv6hdr) - sizeof(*ns);
1926 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1927 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1928 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1929 break;
1930 }
1931 }
1932
1933 /* Ethernet header */
1934 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1935 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1936 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1937 reply->protocol = htons(ETH_P_IPV6);
1938
1939 skb_pull(reply, sizeof(struct ethhdr));
1940 skb_reset_network_header(reply);
1941 skb_put(reply, sizeof(struct ipv6hdr));
1942
1943 /* IPv6 header */
1944
1945 pip6 = ipv6_hdr(reply);
1946 memset(pip6, 0, sizeof(struct ipv6hdr));
1947 pip6->version = 6;
1948 pip6->priority = ipv6_hdr(request)->priority;
1949 pip6->nexthdr = IPPROTO_ICMPV6;
1950 pip6->hop_limit = 255;
1951 pip6->daddr = ipv6_hdr(request)->saddr;
1952 pip6->saddr = *(struct in6_addr *)n->primary_key;
1953
1954 skb_pull(reply, sizeof(struct ipv6hdr));
1955 skb_reset_transport_header(reply);
1956
1957 /* Neighbor Advertisement */
1958 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1959 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1960 na->icmph.icmp6_router = isrouter;
1961 na->icmph.icmp6_override = 1;
1962 na->icmph.icmp6_solicited = 1;
1963 na->target = ns->target;
1964 ether_addr_copy(&na->opt[2], n->ha);
1965 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1966 na->opt[1] = na_olen >> 3;
1967
1968 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1969 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1970 csum_partial(na, sizeof(*na)+na_olen, 0));
1971
1972 pip6->payload_len = htons(sizeof(*na)+na_olen);
1973
1974 skb_push(reply, sizeof(struct ipv6hdr));
1975
1976 reply->ip_summed = CHECKSUM_UNNECESSARY;
1977
1978 return reply;
1979}
1980
1981static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1982{
1983 struct vxlan_dev *vxlan = netdev_priv(dev);
1984 const struct in6_addr *daddr;
1985 const struct ipv6hdr *iphdr;
1986 struct inet6_dev *in6_dev;
1987 struct neighbour *n;
1988 struct nd_msg *msg;
1989
1990 in6_dev = __in6_dev_get(dev);
1991 if (!in6_dev)
1992 goto out;
1993
1994 iphdr = ipv6_hdr(skb);
1995 daddr = &iphdr->daddr;
1996 msg = (struct nd_msg *)(iphdr + 1);
1997
1998 if (ipv6_addr_loopback(daddr) ||
1999 ipv6_addr_is_multicast(&msg->target))
2000 goto out;
2001
2002 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2003
2004 if (n) {
2005 struct vxlan_fdb *f;
2006 struct sk_buff *reply;
2007
2008 if (!(n->nud_state & NUD_CONNECTED)) {
2009 neigh_release(n);
2010 goto out;
2011 }
2012
2013 f = vxlan_find_mac(vxlan, n->ha, vni);
2014 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2015 /* bridge-local neighbor */
2016 neigh_release(n);
2017 goto out;
2018 }
2019
2020 reply = vxlan_na_create(skb, n,
2021 !!(f ? f->flags & NTF_ROUTER : 0));
2022
2023 neigh_release(n);
2024
2025 if (reply == NULL)
2026 goto out;
2027
2028 if (netif_rx_ni(reply) == NET_RX_DROP)
2029 dev->stats.rx_dropped++;
2030
2031 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2032 union vxlan_addr ipa = {
2033 .sin6.sin6_addr = msg->target,
2034 .sin6.sin6_family = AF_INET6,
2035 };
2036
2037 vxlan_ip_miss(dev, &ipa);
2038 }
2039
2040out:
2041 consume_skb(skb);
2042 return NETDEV_TX_OK;
2043}
2044#endif
2045
2046static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2047{
2048 struct vxlan_dev *vxlan = netdev_priv(dev);
2049 struct neighbour *n;
2050
2051 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2052 return false;
2053
2054 n = NULL;
2055 switch (ntohs(eth_hdr(skb)->h_proto)) {
2056 case ETH_P_IP:
2057 {
2058 struct iphdr *pip;
2059
2060 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2061 return false;
2062 pip = ip_hdr(skb);
2063 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2064 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2065 union vxlan_addr ipa = {
2066 .sin.sin_addr.s_addr = pip->daddr,
2067 .sin.sin_family = AF_INET,
2068 };
2069
2070 vxlan_ip_miss(dev, &ipa);
2071 return false;
2072 }
2073
2074 break;
2075 }
2076#if IS_ENABLED(CONFIG_IPV6)
2077 case ETH_P_IPV6:
2078 {
2079 struct ipv6hdr *pip6;
2080
2081 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2082 return false;
2083 pip6 = ipv6_hdr(skb);
2084 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2085 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2086 union vxlan_addr ipa = {
2087 .sin6.sin6_addr = pip6->daddr,
2088 .sin6.sin6_family = AF_INET6,
2089 };
2090
2091 vxlan_ip_miss(dev, &ipa);
2092 return false;
2093 }
2094
2095 break;
2096 }
2097#endif
2098 default:
2099 return false;
2100 }
2101
2102 if (n) {
2103 bool diff;
2104
2105 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2106 if (diff) {
2107 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2108 dev->addr_len);
2109 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2110 }
2111 neigh_release(n);
2112 return diff;
2113 }
2114
2115 return false;
2116}
2117
2118static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2119 struct vxlan_metadata *md)
2120{
2121 struct vxlanhdr_gbp *gbp;
2122
2123 if (!md->gbp)
2124 return;
2125
2126 gbp = (struct vxlanhdr_gbp *)vxh;
2127 vxh->vx_flags |= VXLAN_HF_GBP;
2128
2129 if (md->gbp & VXLAN_GBP_DONT_LEARN)
2130 gbp->dont_learn = 1;
2131
2132 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2133 gbp->policy_applied = 1;
2134
2135 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2136}
2137
2138static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2139 __be16 protocol)
2140{
2141 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2142
2143 gpe->np_applied = 1;
2144 gpe->next_protocol = tun_p_from_eth_p(protocol);
2145 if (!gpe->next_protocol)
2146 return -EPFNOSUPPORT;
2147 return 0;
2148}
2149
2150static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2151 int iphdr_len, __be32 vni,
2152 struct vxlan_metadata *md, u32 vxflags,
2153 bool udp_sum)
2154{
2155 struct vxlanhdr *vxh;
2156 int min_headroom;
2157 int err;
2158 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2159 __be16 inner_protocol = htons(ETH_P_TEB);
2160
2161 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2162 skb->ip_summed == CHECKSUM_PARTIAL) {
2163 int csum_start = skb_checksum_start_offset(skb);
2164
2165 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2166 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2167 (skb->csum_offset == offsetof(struct udphdr, check) ||
2168 skb->csum_offset == offsetof(struct tcphdr, check)))
2169 type |= SKB_GSO_TUNNEL_REMCSUM;
2170 }
2171
2172 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2173 + VXLAN_HLEN + iphdr_len;
2174
2175 /* Need space for new headers (invalidates iph ptr) */
2176 err = skb_cow_head(skb, min_headroom);
2177 if (unlikely(err))
2178 return err;
2179
2180 err = iptunnel_handle_offloads(skb, type);
2181 if (err)
2182 return err;
2183
2184 vxh = __skb_push(skb, sizeof(*vxh));
2185 vxh->vx_flags = VXLAN_HF_VNI;
2186 vxh->vx_vni = vxlan_vni_field(vni);
2187
2188 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2189 unsigned int start;
2190
2191 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2192 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2193 vxh->vx_flags |= VXLAN_HF_RCO;
2194
2195 if (!skb_is_gso(skb)) {
2196 skb->ip_summed = CHECKSUM_NONE;
2197 skb->encapsulation = 0;
2198 }
2199 }
2200
2201 if (vxflags & VXLAN_F_GBP)
2202 vxlan_build_gbp_hdr(vxh, vxflags, md);
2203 if (vxflags & VXLAN_F_GPE) {
2204 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2205 if (err < 0)
2206 return err;
2207 inner_protocol = skb->protocol;
2208 }
2209
2210 skb_set_inner_protocol(skb, inner_protocol);
2211 return 0;
2212}
2213
2214static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2215 struct vxlan_sock *sock4,
2216 struct sk_buff *skb, int oif, u8 tos,
2217 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2218 struct dst_cache *dst_cache,
2219 const struct ip_tunnel_info *info)
2220{
2221 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2222 struct rtable *rt = NULL;
2223 struct flowi4 fl4;
2224
2225 if (!sock4)
2226 return ERR_PTR(-EIO);
2227
2228 if (tos && !info)
2229 use_cache = false;
2230 if (use_cache) {
2231 rt = dst_cache_get_ip4(dst_cache, saddr);
2232 if (rt)
2233 return rt;
2234 }
2235
2236 memset(&fl4, 0, sizeof(fl4));
2237 fl4.flowi4_oif = oif;
2238 fl4.flowi4_tos = RT_TOS(tos);
2239 fl4.flowi4_mark = skb->mark;
2240 fl4.flowi4_proto = IPPROTO_UDP;
2241 fl4.daddr = daddr;
2242 fl4.saddr = *saddr;
2243 fl4.fl4_dport = dport;
2244 fl4.fl4_sport = sport;
2245
2246 rt = ip_route_output_key(vxlan->net, &fl4);
2247 if (!IS_ERR(rt)) {
2248 if (rt->dst.dev == dev) {
2249 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2250 ip_rt_put(rt);
2251 return ERR_PTR(-ELOOP);
2252 }
2253
2254 *saddr = fl4.saddr;
2255 if (use_cache)
2256 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2257 } else {
2258 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2259 return ERR_PTR(-ENETUNREACH);
2260 }
2261 return rt;
2262}
2263
2264#if IS_ENABLED(CONFIG_IPV6)
2265static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2266 struct net_device *dev,
2267 struct vxlan_sock *sock6,
2268 struct sk_buff *skb, int oif, u8 tos,
2269 __be32 label,
2270 const struct in6_addr *daddr,
2271 struct in6_addr *saddr,
2272 __be16 dport, __be16 sport,
2273 struct dst_cache *dst_cache,
2274 const struct ip_tunnel_info *info)
2275{
2276 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2277 struct dst_entry *ndst;
2278 struct flowi6 fl6;
2279 int err;
2280
2281 if (!sock6)
2282 return ERR_PTR(-EIO);
2283
2284 if (tos && !info)
2285 use_cache = false;
2286 if (use_cache) {
2287 ndst = dst_cache_get_ip6(dst_cache, saddr);
2288 if (ndst)
2289 return ndst;
2290 }
2291
2292 memset(&fl6, 0, sizeof(fl6));
2293 fl6.flowi6_oif = oif;
2294 fl6.daddr = *daddr;
2295 fl6.saddr = *saddr;
2296 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2297 fl6.flowi6_mark = skb->mark;
2298 fl6.flowi6_proto = IPPROTO_UDP;
2299 fl6.fl6_dport = dport;
2300 fl6.fl6_sport = sport;
2301
2302 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2303 sock6->sock->sk,
2304 &ndst, &fl6);
2305 if (unlikely(err < 0)) {
2306 netdev_dbg(dev, "no route to %pI6\n", daddr);
2307 return ERR_PTR(-ENETUNREACH);
2308 }
2309
2310 if (unlikely(ndst->dev == dev)) {
2311 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2312 dst_release(ndst);
2313 return ERR_PTR(-ELOOP);
2314 }
2315
2316 *saddr = fl6.saddr;
2317 if (use_cache)
2318 dst_cache_set_ip6(dst_cache, ndst, saddr);
2319 return ndst;
2320}
2321#endif
2322
2323/* Bypass encapsulation if the destination is local */
2324static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2325 struct vxlan_dev *dst_vxlan, __be32 vni)
2326{
2327 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2328 union vxlan_addr loopback;
2329 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2330 struct net_device *dev;
2331 int len = skb->len;
2332
2333 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2334 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2335 skb->pkt_type = PACKET_HOST;
2336 skb->encapsulation = 0;
2337 skb->dev = dst_vxlan->dev;
2338 __skb_pull(skb, skb_network_offset(skb));
2339
2340 if (remote_ip->sa.sa_family == AF_INET) {
2341 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2342 loopback.sa.sa_family = AF_INET;
2343#if IS_ENABLED(CONFIG_IPV6)
2344 } else {
2345 loopback.sin6.sin6_addr = in6addr_loopback;
2346 loopback.sa.sa_family = AF_INET6;
2347#endif
2348 }
2349
2350 rcu_read_lock();
2351 dev = skb->dev;
2352 if (unlikely(!(dev->flags & IFF_UP))) {
2353 kfree_skb(skb);
2354 goto drop;
2355 }
2356
2357 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2358 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2359
2360 u64_stats_update_begin(&tx_stats->syncp);
2361 tx_stats->tx_packets++;
2362 tx_stats->tx_bytes += len;
2363 u64_stats_update_end(&tx_stats->syncp);
2364
2365 if (netif_rx(skb) == NET_RX_SUCCESS) {
2366 u64_stats_update_begin(&rx_stats->syncp);
2367 rx_stats->rx_packets++;
2368 rx_stats->rx_bytes += len;
2369 u64_stats_update_end(&rx_stats->syncp);
2370 } else {
2371drop:
2372 dev->stats.rx_dropped++;
2373 }
2374 rcu_read_unlock();
2375}
2376
2377static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2378 struct vxlan_dev *vxlan,
2379 union vxlan_addr *daddr,
2380 __be16 dst_port, int dst_ifindex, __be32 vni,
2381 struct dst_entry *dst,
2382 u32 rt_flags)
2383{
2384#if IS_ENABLED(CONFIG_IPV6)
2385 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2386 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2387 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2388 */
2389 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2390#endif
2391 /* Bypass encapsulation if the destination is local */
2392 if (rt_flags & RTCF_LOCAL &&
2393 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2394 struct vxlan_dev *dst_vxlan;
2395
2396 dst_release(dst);
2397 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2398 daddr->sa.sa_family, dst_port,
2399 vxlan->cfg.flags);
2400 if (!dst_vxlan) {
2401 dev->stats.tx_errors++;
2402 kfree_skb(skb);
2403
2404 return -ENOENT;
2405 }
2406 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2407 return 1;
2408 }
2409
2410 return 0;
2411}
2412
2413static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2414 __be32 default_vni, struct vxlan_rdst *rdst,
2415 bool did_rsc)
2416{
2417 struct dst_cache *dst_cache;
2418 struct ip_tunnel_info *info;
2419 struct vxlan_dev *vxlan = netdev_priv(dev);
2420 const struct iphdr *old_iph = ip_hdr(skb);
2421 union vxlan_addr *dst;
2422 union vxlan_addr remote_ip, local_ip;
2423 struct vxlan_metadata _md;
2424 struct vxlan_metadata *md = &_md;
2425 __be16 src_port = 0, dst_port;
2426 struct dst_entry *ndst = NULL;
2427 __be32 vni, label;
2428 __u8 tos, ttl;
2429 int ifindex;
2430 int err;
2431 u32 flags = vxlan->cfg.flags;
2432 bool udp_sum = false;
2433 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2434
2435 info = skb_tunnel_info(skb);
2436
2437 if (rdst) {
2438 dst = &rdst->remote_ip;
2439 if (vxlan_addr_any(dst)) {
2440 if (did_rsc) {
2441 /* short-circuited back to local bridge */
2442 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2443 return;
2444 }
2445 goto drop;
2446 }
2447
2448 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2449 vni = (rdst->remote_vni) ? : default_vni;
2450 ifindex = rdst->remote_ifindex;
2451 local_ip = vxlan->cfg.saddr;
2452 dst_cache = &rdst->dst_cache;
2453 md->gbp = skb->mark;
2454 if (flags & VXLAN_F_TTL_INHERIT) {
2455 ttl = ip_tunnel_get_ttl(old_iph, skb);
2456 } else {
2457 ttl = vxlan->cfg.ttl;
2458 if (!ttl && vxlan_addr_multicast(dst))
2459 ttl = 1;
2460 }
2461
2462 tos = vxlan->cfg.tos;
2463 if (tos == 1)
2464 tos = ip_tunnel_get_dsfield(old_iph, skb);
2465
2466 if (dst->sa.sa_family == AF_INET)
2467 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2468 else
2469 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2470 label = vxlan->cfg.label;
2471 } else {
2472 if (!info) {
2473 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2474 dev->name);
2475 goto drop;
2476 }
2477 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2478 if (remote_ip.sa.sa_family == AF_INET) {
2479 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2480 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2481 } else {
2482 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2483 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2484 }
2485 dst = &remote_ip;
2486 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2487 vni = tunnel_id_to_key32(info->key.tun_id);
2488 ifindex = 0;
2489 dst_cache = &info->dst_cache;
2490 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2491 if (info->options_len < sizeof(*md))
2492 goto drop;
2493 md = ip_tunnel_info_opts(info);
2494 }
2495 ttl = info->key.ttl;
2496 tos = info->key.tos;
2497 label = info->key.label;
2498 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2499 }
2500 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2501 vxlan->cfg.port_max, true);
2502
2503 rcu_read_lock();
2504 if (dst->sa.sa_family == AF_INET) {
2505 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2506 struct rtable *rt;
2507 __be16 df = 0;
2508
2509 if (!ifindex)
2510 ifindex = sock4->sock->sk->sk_bound_dev_if;
2511
2512 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2513 dst->sin.sin_addr.s_addr,
2514 &local_ip.sin.sin_addr.s_addr,
2515 dst_port, src_port,
2516 dst_cache, info);
2517 if (IS_ERR(rt)) {
2518 err = PTR_ERR(rt);
2519 goto tx_error;
2520 }
2521
2522 if (!info) {
2523 /* Bypass encapsulation if the destination is local */
2524 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2525 dst_port, ifindex, vni,
2526 &rt->dst, rt->rt_flags);
2527 if (err)
2528 goto out_unlock;
2529
2530 if (vxlan->cfg.df == VXLAN_DF_SET) {
2531 df = htons(IP_DF);
2532 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2533 struct ethhdr *eth = eth_hdr(skb);
2534
2535 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2536 (ntohs(eth->h_proto) == ETH_P_IP &&
2537 old_iph->frag_off & htons(IP_DF)))
2538 df = htons(IP_DF);
2539 }
2540 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2541 df = htons(IP_DF);
2542 }
2543
2544 ndst = &rt->dst;
2545 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2546
2547 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2548 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2549 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2550 vni, md, flags, udp_sum);
2551 if (err < 0)
2552 goto tx_error;
2553
2554 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2555 dst->sin.sin_addr.s_addr, tos, ttl, df,
2556 src_port, dst_port, xnet, !udp_sum);
2557#if IS_ENABLED(CONFIG_IPV6)
2558 } else {
2559 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2560
2561 if (!ifindex)
2562 ifindex = sock6->sock->sk->sk_bound_dev_if;
2563
2564 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2565 label, &dst->sin6.sin6_addr,
2566 &local_ip.sin6.sin6_addr,
2567 dst_port, src_port,
2568 dst_cache, info);
2569 if (IS_ERR(ndst)) {
2570 err = PTR_ERR(ndst);
2571 ndst = NULL;
2572 goto tx_error;
2573 }
2574
2575 if (!info) {
2576 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2577
2578 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2579 dst_port, ifindex, vni,
2580 ndst, rt6i_flags);
2581 if (err)
2582 goto out_unlock;
2583 }
2584
2585 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2586
2587 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2588 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2589 skb_scrub_packet(skb, xnet);
2590 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2591 vni, md, flags, udp_sum);
2592 if (err < 0)
2593 goto tx_error;
2594
2595 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2596 &local_ip.sin6.sin6_addr,
2597 &dst->sin6.sin6_addr, tos, ttl,
2598 label, src_port, dst_port, !udp_sum);
2599#endif
2600 }
2601out_unlock:
2602 rcu_read_unlock();
2603 return;
2604
2605drop:
2606 dev->stats.tx_dropped++;
2607 dev_kfree_skb(skb);
2608 return;
2609
2610tx_error:
2611 rcu_read_unlock();
2612 if (err == -ELOOP)
2613 dev->stats.collisions++;
2614 else if (err == -ENETUNREACH)
2615 dev->stats.tx_carrier_errors++;
2616 dst_release(ndst);
2617 dev->stats.tx_errors++;
2618 kfree_skb(skb);
2619}
2620
2621/* Transmit local packets over Vxlan
2622 *
2623 * Outer IP header inherits ECN and DF from inner header.
2624 * Outer UDP destination is the VXLAN assigned port.
2625 * source port is based on hash of flow
2626 */
2627static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2628{
2629 struct vxlan_dev *vxlan = netdev_priv(dev);
2630 struct vxlan_rdst *rdst, *fdst = NULL;
2631 const struct ip_tunnel_info *info;
2632 bool did_rsc = false;
2633 struct vxlan_fdb *f;
2634 struct ethhdr *eth;
2635 __be32 vni = 0;
2636
2637 info = skb_tunnel_info(skb);
2638
2639 skb_reset_mac_header(skb);
2640
2641 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2642 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2643 info->mode & IP_TUNNEL_INFO_TX) {
2644 vni = tunnel_id_to_key32(info->key.tun_id);
2645 } else {
2646 if (info && info->mode & IP_TUNNEL_INFO_TX)
2647 vxlan_xmit_one(skb, dev, vni, NULL, false);
2648 else
2649 kfree_skb(skb);
2650 return NETDEV_TX_OK;
2651 }
2652 }
2653
2654 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2655 eth = eth_hdr(skb);
2656 if (ntohs(eth->h_proto) == ETH_P_ARP)
2657 return arp_reduce(dev, skb, vni);
2658#if IS_ENABLED(CONFIG_IPV6)
2659 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2660 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2661 sizeof(struct nd_msg)) &&
2662 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2663 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2664
2665 if (m->icmph.icmp6_code == 0 &&
2666 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2667 return neigh_reduce(dev, skb, vni);
2668 }
2669#endif
2670 }
2671
2672 eth = eth_hdr(skb);
2673 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2674 did_rsc = false;
2675
2676 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2677 (ntohs(eth->h_proto) == ETH_P_IP ||
2678 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2679 did_rsc = route_shortcircuit(dev, skb);
2680 if (did_rsc)
2681 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2682 }
2683
2684 if (f == NULL) {
2685 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2686 if (f == NULL) {
2687 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2688 !is_multicast_ether_addr(eth->h_dest))
2689 vxlan_fdb_miss(vxlan, eth->h_dest);
2690
2691 dev->stats.tx_dropped++;
2692 kfree_skb(skb);
2693 return NETDEV_TX_OK;
2694 }
2695 }
2696
2697 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2698 struct sk_buff *skb1;
2699
2700 if (!fdst) {
2701 fdst = rdst;
2702 continue;
2703 }
2704 skb1 = skb_clone(skb, GFP_ATOMIC);
2705 if (skb1)
2706 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2707 }
2708
2709 if (fdst)
2710 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2711 else
2712 kfree_skb(skb);
2713 return NETDEV_TX_OK;
2714}
2715
2716/* Walk the forwarding table and purge stale entries */
2717static void vxlan_cleanup(struct timer_list *t)
2718{
2719 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2720 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2721 unsigned int h;
2722
2723 if (!netif_running(vxlan->dev))
2724 return;
2725
2726 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2727 struct hlist_node *p, *n;
2728
2729 spin_lock(&vxlan->hash_lock[h]);
2730 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2731 struct vxlan_fdb *f
2732 = container_of(p, struct vxlan_fdb, hlist);
2733 unsigned long timeout;
2734
2735 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2736 continue;
2737
2738 if (f->flags & NTF_EXT_LEARNED)
2739 continue;
2740
2741 timeout = f->used + vxlan->cfg.age_interval * HZ;
2742 if (time_before_eq(timeout, jiffies)) {
2743 netdev_dbg(vxlan->dev,
2744 "garbage collect %pM\n",
2745 f->eth_addr);
2746 f->state = NUD_STALE;
2747 vxlan_fdb_destroy(vxlan, f, true, true);
2748 } else if (time_before(timeout, next_timer))
2749 next_timer = timeout;
2750 }
2751 spin_unlock(&vxlan->hash_lock[h]);
2752 }
2753
2754 mod_timer(&vxlan->age_timer, next_timer);
2755}
2756
2757static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2758{
2759 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2760
2761 spin_lock(&vn->sock_lock);
2762 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2763#if IS_ENABLED(CONFIG_IPV6)
2764 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2765#endif
2766 spin_unlock(&vn->sock_lock);
2767}
2768
2769static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2770 struct vxlan_dev_node *node)
2771{
2772 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2773 __be32 vni = vxlan->default_dst.remote_vni;
2774
2775 node->vxlan = vxlan;
2776 spin_lock(&vn->sock_lock);
2777 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2778 spin_unlock(&vn->sock_lock);
2779}
2780
2781/* Setup stats when device is created */
2782static int vxlan_init(struct net_device *dev)
2783{
2784 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2785 if (!dev->tstats)
2786 return -ENOMEM;
2787
2788 return 0;
2789}
2790
2791static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2792{
2793 struct vxlan_fdb *f;
2794 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2795
2796 spin_lock_bh(&vxlan->hash_lock[hash_index]);
2797 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2798 if (f)
2799 vxlan_fdb_destroy(vxlan, f, true, true);
2800 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2801}
2802
2803static void vxlan_uninit(struct net_device *dev)
2804{
2805 struct vxlan_dev *vxlan = netdev_priv(dev);
2806
2807 gro_cells_destroy(&vxlan->gro_cells);
2808
2809 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2810
2811 free_percpu(dev->tstats);
2812}
2813
2814/* Start ageing timer and join group when device is brought up */
2815static int vxlan_open(struct net_device *dev)
2816{
2817 struct vxlan_dev *vxlan = netdev_priv(dev);
2818 int ret;
2819
2820 ret = vxlan_sock_add(vxlan);
2821 if (ret < 0)
2822 return ret;
2823
2824 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2825 ret = vxlan_igmp_join(vxlan);
2826 if (ret == -EADDRINUSE)
2827 ret = 0;
2828 if (ret) {
2829 vxlan_sock_release(vxlan);
2830 return ret;
2831 }
2832 }
2833
2834 if (vxlan->cfg.age_interval)
2835 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2836
2837 return ret;
2838}
2839
2840/* Purge the forwarding table */
2841static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2842{
2843 unsigned int h;
2844
2845 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2846 struct hlist_node *p, *n;
2847
2848 spin_lock_bh(&vxlan->hash_lock[h]);
2849 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2850 struct vxlan_fdb *f
2851 = container_of(p, struct vxlan_fdb, hlist);
2852 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2853 continue;
2854 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2855 if (!is_zero_ether_addr(f->eth_addr))
2856 vxlan_fdb_destroy(vxlan, f, true, true);
2857 }
2858 spin_unlock_bh(&vxlan->hash_lock[h]);
2859 }
2860}
2861
2862/* Cleanup timer and forwarding table on shutdown */
2863static int vxlan_stop(struct net_device *dev)
2864{
2865 struct vxlan_dev *vxlan = netdev_priv(dev);
2866 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2867 int ret = 0;
2868
2869 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2870 !vxlan_group_used(vn, vxlan))
2871 ret = vxlan_igmp_leave(vxlan);
2872
2873 del_timer_sync(&vxlan->age_timer);
2874
2875 vxlan_flush(vxlan, false);
2876 vxlan_sock_release(vxlan);
2877
2878 return ret;
2879}
2880
2881/* Stub, nothing needs to be done. */
2882static void vxlan_set_multicast_list(struct net_device *dev)
2883{
2884}
2885
2886static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2887{
2888 struct vxlan_dev *vxlan = netdev_priv(dev);
2889 struct vxlan_rdst *dst = &vxlan->default_dst;
2890 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2891 dst->remote_ifindex);
2892 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2893
2894 /* This check is different than dev->max_mtu, because it looks at
2895 * the lowerdev->mtu, rather than the static dev->max_mtu
2896 */
2897 if (lowerdev) {
2898 int max_mtu = lowerdev->mtu -
2899 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2900 if (new_mtu > max_mtu)
2901 return -EINVAL;
2902 }
2903
2904 dev->mtu = new_mtu;
2905 return 0;
2906}
2907
2908static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2909{
2910 struct vxlan_dev *vxlan = netdev_priv(dev);
2911 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2912 __be16 sport, dport;
2913
2914 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2915 vxlan->cfg.port_max, true);
2916 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2917
2918 if (ip_tunnel_info_af(info) == AF_INET) {
2919 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2920 struct rtable *rt;
2921
2922 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2923 info->key.u.ipv4.dst,
2924 &info->key.u.ipv4.src, dport, sport,
2925 &info->dst_cache, info);
2926 if (IS_ERR(rt))
2927 return PTR_ERR(rt);
2928 ip_rt_put(rt);
2929 } else {
2930#if IS_ENABLED(CONFIG_IPV6)
2931 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2932 struct dst_entry *ndst;
2933
2934 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2935 info->key.label, &info->key.u.ipv6.dst,
2936 &info->key.u.ipv6.src, dport, sport,
2937 &info->dst_cache, info);
2938 if (IS_ERR(ndst))
2939 return PTR_ERR(ndst);
2940 dst_release(ndst);
2941#else /* !CONFIG_IPV6 */
2942 return -EPFNOSUPPORT;
2943#endif
2944 }
2945 info->key.tp_src = sport;
2946 info->key.tp_dst = dport;
2947 return 0;
2948}
2949
2950static const struct net_device_ops vxlan_netdev_ether_ops = {
2951 .ndo_init = vxlan_init,
2952 .ndo_uninit = vxlan_uninit,
2953 .ndo_open = vxlan_open,
2954 .ndo_stop = vxlan_stop,
2955 .ndo_start_xmit = vxlan_xmit,
2956 .ndo_get_stats64 = ip_tunnel_get_stats64,
2957 .ndo_set_rx_mode = vxlan_set_multicast_list,
2958 .ndo_change_mtu = vxlan_change_mtu,
2959 .ndo_validate_addr = eth_validate_addr,
2960 .ndo_set_mac_address = eth_mac_addr,
2961 .ndo_fdb_add = vxlan_fdb_add,
2962 .ndo_fdb_del = vxlan_fdb_delete,
2963 .ndo_fdb_dump = vxlan_fdb_dump,
2964 .ndo_fdb_get = vxlan_fdb_get,
2965 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2966 .ndo_change_proto_down = dev_change_proto_down_generic,
2967};
2968
2969static const struct net_device_ops vxlan_netdev_raw_ops = {
2970 .ndo_init = vxlan_init,
2971 .ndo_uninit = vxlan_uninit,
2972 .ndo_open = vxlan_open,
2973 .ndo_stop = vxlan_stop,
2974 .ndo_start_xmit = vxlan_xmit,
2975 .ndo_get_stats64 = ip_tunnel_get_stats64,
2976 .ndo_change_mtu = vxlan_change_mtu,
2977 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2978};
2979
2980/* Info for udev, that this is a virtual tunnel endpoint */
2981static struct device_type vxlan_type = {
2982 .name = "vxlan",
2983};
2984
2985/* Calls the ndo_udp_tunnel_add of the caller in order to
2986 * supply the listening VXLAN udp ports. Callers are expected
2987 * to implement the ndo_udp_tunnel_add.
2988 */
2989static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2990{
2991 struct vxlan_sock *vs;
2992 struct net *net = dev_net(dev);
2993 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2994 unsigned int i;
2995
2996 spin_lock(&vn->sock_lock);
2997 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2998 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2999 unsigned short type;
3000
3001 if (vs->flags & VXLAN_F_GPE)
3002 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3003 else
3004 type = UDP_TUNNEL_TYPE_VXLAN;
3005
3006 if (push)
3007 udp_tunnel_push_rx_port(dev, vs->sock, type);
3008 else
3009 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3010 }
3011 }
3012 spin_unlock(&vn->sock_lock);
3013}
3014
3015/* Initialize the device structure. */
3016static void vxlan_setup(struct net_device *dev)
3017{
3018 struct vxlan_dev *vxlan = netdev_priv(dev);
3019 unsigned int h;
3020
3021 eth_hw_addr_random(dev);
3022 ether_setup(dev);
3023
3024 dev->needs_free_netdev = true;
3025 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3026
3027 dev->features |= NETIF_F_LLTX;
3028 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
3029 dev->features |= NETIF_F_RXCSUM;
3030 dev->features |= NETIF_F_GSO_SOFTWARE;
3031
3032 dev->vlan_features = dev->features;
3033 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3034 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3035 netif_keep_dst(dev);
3036 dev->priv_flags |= IFF_NO_QUEUE;
3037
3038 /* MTU range: 68 - 65535 */
3039 dev->min_mtu = ETH_MIN_MTU;
3040 dev->max_mtu = ETH_MAX_MTU;
3041
3042 INIT_LIST_HEAD(&vxlan->next);
3043
3044 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3045
3046 vxlan->dev = dev;
3047
3048 gro_cells_init(&vxlan->gro_cells, dev);
3049
3050 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3051 spin_lock_init(&vxlan->hash_lock[h]);
3052 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3053 }
3054}
3055
3056static void vxlan_ether_setup(struct net_device *dev)
3057{
3058 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3059 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3060 dev->netdev_ops = &vxlan_netdev_ether_ops;
3061}
3062
3063static void vxlan_raw_setup(struct net_device *dev)
3064{
3065 dev->header_ops = NULL;
3066 dev->type = ARPHRD_NONE;
3067 dev->hard_header_len = 0;
3068 dev->addr_len = 0;
3069 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3070 dev->netdev_ops = &vxlan_netdev_raw_ops;
3071}
3072
3073static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3074 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
3075 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
3076 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
3077 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
3078 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
3079 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
3080 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
3081 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
3082 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
3083 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
3084 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
3085 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
3086 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
3087 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
3088 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
3089 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
3090 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
3091 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
3092 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
3093 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
3094 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
3095 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
3096 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3097 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3098 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
3099 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
3100 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
3101 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
3102 [IFLA_VXLAN_DF] = { .type = NLA_U8 },
3103};
3104
3105static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3106 struct netlink_ext_ack *extack)
3107{
3108 if (tb[IFLA_ADDRESS]) {
3109 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3110 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3111 "Provided link layer address is not Ethernet");
3112 return -EINVAL;
3113 }
3114
3115 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3116 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3117 "Provided Ethernet address is not unicast");
3118 return -EADDRNOTAVAIL;
3119 }
3120 }
3121
3122 if (tb[IFLA_MTU]) {
3123 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3124
3125 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3126 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3127 "MTU must be between 68 and 65535");
3128 return -EINVAL;
3129 }
3130 }
3131
3132 if (!data) {
3133 NL_SET_ERR_MSG(extack,
3134 "Required attributes not provided to perform the operation");
3135 return -EINVAL;
3136 }
3137
3138 if (data[IFLA_VXLAN_ID]) {
3139 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3140
3141 if (id >= VXLAN_N_VID) {
3142 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
3143 "VXLAN ID must be lower than 16777216");
3144 return -ERANGE;
3145 }
3146 }
3147
3148 if (data[IFLA_VXLAN_PORT_RANGE]) {
3149 const struct ifla_vxlan_port_range *p
3150 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3151
3152 if (ntohs(p->high) < ntohs(p->low)) {
3153 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3154 "Invalid source port range");
3155 return -EINVAL;
3156 }
3157 }
3158
3159 if (data[IFLA_VXLAN_DF]) {
3160 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3161
3162 if (df < 0 || df > VXLAN_DF_MAX) {
3163 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF],
3164 "Invalid DF attribute");
3165 return -EINVAL;
3166 }
3167 }
3168
3169 return 0;
3170}
3171
3172static void vxlan_get_drvinfo(struct net_device *netdev,
3173 struct ethtool_drvinfo *drvinfo)
3174{
3175 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3176 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3177}
3178
3179static const struct ethtool_ops vxlan_ethtool_ops = {
3180 .get_drvinfo = vxlan_get_drvinfo,
3181 .get_link = ethtool_op_get_link,
3182};
3183
3184static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3185 __be16 port, u32 flags, int ifindex)
3186{
3187 struct socket *sock;
3188 struct udp_port_cfg udp_conf;
3189 int err;
3190
3191 memset(&udp_conf, 0, sizeof(udp_conf));
3192
3193 if (ipv6) {
3194 udp_conf.family = AF_INET6;
3195 udp_conf.use_udp6_rx_checksums =
3196 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3197 udp_conf.ipv6_v6only = 1;
3198 } else {
3199 udp_conf.family = AF_INET;
3200 }
3201
3202 udp_conf.local_udp_port = port;
3203 udp_conf.bind_ifindex = ifindex;
3204
3205 /* Open UDP socket */
3206 err = udp_sock_create(net, &udp_conf, &sock);
3207 if (err < 0)
3208 return ERR_PTR(err);
3209
3210 return sock;
3211}
3212
3213/* Create new listen socket if needed */
3214static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3215 __be16 port, u32 flags,
3216 int ifindex)
3217{
3218 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3219 struct vxlan_sock *vs;
3220 struct socket *sock;
3221 unsigned int h;
3222 struct udp_tunnel_sock_cfg tunnel_cfg;
3223
3224 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3225 if (!vs)
3226 return ERR_PTR(-ENOMEM);
3227
3228 for (h = 0; h < VNI_HASH_SIZE; ++h)
3229 INIT_HLIST_HEAD(&vs->vni_list[h]);
3230
3231 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3232 if (IS_ERR(sock)) {
3233 kfree(vs);
3234 return ERR_CAST(sock);
3235 }
3236
3237 vs->sock = sock;
3238 refcount_set(&vs->refcnt, 1);
3239 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3240
3241 spin_lock(&vn->sock_lock);
3242 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3243 udp_tunnel_notify_add_rx_port(sock,
3244 (vs->flags & VXLAN_F_GPE) ?
3245 UDP_TUNNEL_TYPE_VXLAN_GPE :
3246 UDP_TUNNEL_TYPE_VXLAN);
3247 spin_unlock(&vn->sock_lock);
3248
3249 /* Mark socket as an encapsulation socket. */
3250 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3251 tunnel_cfg.sk_user_data = vs;
3252 tunnel_cfg.encap_type = 1;
3253 tunnel_cfg.encap_rcv = vxlan_rcv;
3254 tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3255 tunnel_cfg.encap_destroy = NULL;
3256 tunnel_cfg.gro_receive = vxlan_gro_receive;
3257 tunnel_cfg.gro_complete = vxlan_gro_complete;
3258
3259 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3260
3261 return vs;
3262}
3263
3264static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3265{
3266 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3267 struct vxlan_sock *vs = NULL;
3268 struct vxlan_dev_node *node;
3269 int l3mdev_index = 0;
3270
3271 if (vxlan->cfg.remote_ifindex)
3272 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3273 vxlan->net, vxlan->cfg.remote_ifindex);
3274
3275 if (!vxlan->cfg.no_share) {
3276 spin_lock(&vn->sock_lock);
3277 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3278 vxlan->cfg.dst_port, vxlan->cfg.flags,
3279 l3mdev_index);
3280 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3281 spin_unlock(&vn->sock_lock);
3282 return -EBUSY;
3283 }
3284 spin_unlock(&vn->sock_lock);
3285 }
3286 if (!vs)
3287 vs = vxlan_socket_create(vxlan->net, ipv6,
3288 vxlan->cfg.dst_port, vxlan->cfg.flags,
3289 l3mdev_index);
3290 if (IS_ERR(vs))
3291 return PTR_ERR(vs);
3292#if IS_ENABLED(CONFIG_IPV6)
3293 if (ipv6) {
3294 rcu_assign_pointer(vxlan->vn6_sock, vs);
3295 node = &vxlan->hlist6;
3296 } else
3297#endif
3298 {
3299 rcu_assign_pointer(vxlan->vn4_sock, vs);
3300 node = &vxlan->hlist4;
3301 }
3302 vxlan_vs_add_dev(vs, vxlan, node);
3303 return 0;
3304}
3305
3306static int vxlan_sock_add(struct vxlan_dev *vxlan)
3307{
3308 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3309 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3310 bool ipv4 = !ipv6 || metadata;
3311 int ret = 0;
3312
3313 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3314#if IS_ENABLED(CONFIG_IPV6)
3315 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3316 if (ipv6) {
3317 ret = __vxlan_sock_add(vxlan, true);
3318 if (ret < 0 && ret != -EAFNOSUPPORT)
3319 ipv4 = false;
3320 }
3321#endif
3322 if (ipv4)
3323 ret = __vxlan_sock_add(vxlan, false);
3324 if (ret < 0)
3325 vxlan_sock_release(vxlan);
3326 return ret;
3327}
3328
3329static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3330 struct net_device **lower,
3331 struct vxlan_dev *old,
3332 struct netlink_ext_ack *extack)
3333{
3334 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3335 struct vxlan_dev *tmp;
3336 bool use_ipv6 = false;
3337
3338 if (conf->flags & VXLAN_F_GPE) {
3339 /* For now, allow GPE only together with
3340 * COLLECT_METADATA. This can be relaxed later; in such
3341 * case, the other side of the PtP link will have to be
3342 * provided.
3343 */
3344 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3345 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3346 NL_SET_ERR_MSG(extack,
3347 "VXLAN GPE does not support this combination of attributes");
3348 return -EINVAL;
3349 }
3350 }
3351
3352 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3353 /* Unless IPv6 is explicitly requested, assume IPv4 */
3354 conf->remote_ip.sa.sa_family = AF_INET;
3355 conf->saddr.sa.sa_family = AF_INET;
3356 } else if (!conf->remote_ip.sa.sa_family) {
3357 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3358 } else if (!conf->saddr.sa.sa_family) {
3359 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3360 }
3361
3362 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3363 NL_SET_ERR_MSG(extack,
3364 "Local and remote address must be from the same family");
3365 return -EINVAL;
3366 }
3367
3368 if (vxlan_addr_multicast(&conf->saddr)) {
3369 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3370 return -EINVAL;
3371 }
3372
3373 if (conf->saddr.sa.sa_family == AF_INET6) {
3374 if (!IS_ENABLED(CONFIG_IPV6)) {
3375 NL_SET_ERR_MSG(extack,
3376 "IPv6 support not enabled in the kernel");
3377 return -EPFNOSUPPORT;
3378 }
3379 use_ipv6 = true;
3380 conf->flags |= VXLAN_F_IPV6;
3381
3382 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3383 int local_type =
3384 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3385 int remote_type =
3386 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3387
3388 if (local_type & IPV6_ADDR_LINKLOCAL) {
3389 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3390 (remote_type != IPV6_ADDR_ANY)) {
3391 NL_SET_ERR_MSG(extack,
3392 "Invalid combination of local and remote address scopes");
3393 return -EINVAL;
3394 }
3395
3396 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3397 } else {
3398 if (remote_type ==
3399 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3400 NL_SET_ERR_MSG(extack,
3401 "Invalid combination of local and remote address scopes");
3402 return -EINVAL;
3403 }
3404
3405 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3406 }
3407 }
3408 }
3409
3410 if (conf->label && !use_ipv6) {
3411 NL_SET_ERR_MSG(extack,
3412 "Label attribute only applies to IPv6 VXLAN devices");
3413 return -EINVAL;
3414 }
3415
3416 if (conf->remote_ifindex) {
3417 struct net_device *lowerdev;
3418
3419 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3420 if (!lowerdev) {
3421 NL_SET_ERR_MSG(extack,
3422 "Invalid local interface, device not found");
3423 return -ENODEV;
3424 }
3425
3426#if IS_ENABLED(CONFIG_IPV6)
3427 if (use_ipv6) {
3428 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3429 if (idev && idev->cnf.disable_ipv6) {
3430 NL_SET_ERR_MSG(extack,
3431 "IPv6 support disabled by administrator");
3432 return -EPERM;
3433 }
3434 }
3435#endif
3436
3437 *lower = lowerdev;
3438 } else {
3439 if (vxlan_addr_multicast(&conf->remote_ip)) {
3440 NL_SET_ERR_MSG(extack,
3441 "Local interface required for multicast remote destination");
3442
3443 return -EINVAL;
3444 }
3445
3446#if IS_ENABLED(CONFIG_IPV6)
3447 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3448 NL_SET_ERR_MSG(extack,
3449 "Local interface required for link-local local/remote addresses");
3450 return -EINVAL;
3451 }
3452#endif
3453
3454 *lower = NULL;
3455 }
3456
3457 if (!conf->dst_port) {
3458 if (conf->flags & VXLAN_F_GPE)
3459 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3460 else
3461 conf->dst_port = htons(vxlan_port);
3462 }
3463
3464 if (!conf->age_interval)
3465 conf->age_interval = FDB_AGE_DEFAULT;
3466
3467 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3468 if (tmp == old)
3469 continue;
3470
3471 if (tmp->cfg.vni != conf->vni)
3472 continue;
3473 if (tmp->cfg.dst_port != conf->dst_port)
3474 continue;
3475 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3476 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3477 continue;
3478
3479 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3480 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3481 continue;
3482
3483 NL_SET_ERR_MSG(extack,
3484 "A VXLAN device with the specified VNI already exists");
3485 return -EEXIST;
3486 }
3487
3488 return 0;
3489}
3490
3491static void vxlan_config_apply(struct net_device *dev,
3492 struct vxlan_config *conf,
3493 struct net_device *lowerdev,
3494 struct net *src_net,
3495 bool changelink)
3496{
3497 struct vxlan_dev *vxlan = netdev_priv(dev);
3498 struct vxlan_rdst *dst = &vxlan->default_dst;
3499 unsigned short needed_headroom = ETH_HLEN;
3500 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3501 int max_mtu = ETH_MAX_MTU;
3502
3503 if (!changelink) {
3504 if (conf->flags & VXLAN_F_GPE)
3505 vxlan_raw_setup(dev);
3506 else
3507 vxlan_ether_setup(dev);
3508
3509 if (conf->mtu)
3510 dev->mtu = conf->mtu;
3511
3512 vxlan->net = src_net;
3513 }
3514
3515 dst->remote_vni = conf->vni;
3516
3517 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3518
3519 if (lowerdev) {
3520 dst->remote_ifindex = conf->remote_ifindex;
3521
3522 dev->gso_max_size = lowerdev->gso_max_size;
3523 dev->gso_max_segs = lowerdev->gso_max_segs;
3524
3525 needed_headroom = lowerdev->hard_header_len;
3526
3527 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3528 VXLAN_HEADROOM);
3529 if (max_mtu < ETH_MIN_MTU)
3530 max_mtu = ETH_MIN_MTU;
3531
3532 if (!changelink && !conf->mtu)
3533 dev->mtu = max_mtu;
3534 }
3535
3536 if (dev->mtu > max_mtu)
3537 dev->mtu = max_mtu;
3538
3539 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3540 needed_headroom += VXLAN6_HEADROOM;
3541 else
3542 needed_headroom += VXLAN_HEADROOM;
3543 dev->needed_headroom = needed_headroom;
3544
3545 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3546}
3547
3548static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3549 struct vxlan_config *conf, bool changelink,
3550 struct netlink_ext_ack *extack)
3551{
3552 struct vxlan_dev *vxlan = netdev_priv(dev);
3553 struct net_device *lowerdev;
3554 int ret;
3555
3556 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3557 if (ret)
3558 return ret;
3559
3560 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3561
3562 return 0;
3563}
3564
3565static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3566 struct vxlan_config *conf,
3567 struct netlink_ext_ack *extack)
3568{
3569 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3570 struct vxlan_dev *vxlan = netdev_priv(dev);
3571 struct net_device *remote_dev = NULL;
3572 struct vxlan_fdb *f = NULL;
3573 bool unregister = false;
3574 struct vxlan_rdst *dst;
3575 int err;
3576
3577 dst = &vxlan->default_dst;
3578 err = vxlan_dev_configure(net, dev, conf, false, extack);
3579 if (err)
3580 return err;
3581
3582 dev->ethtool_ops = &vxlan_ethtool_ops;
3583
3584 /* create an fdb entry for a valid default destination */
3585 if (!vxlan_addr_any(&dst->remote_ip)) {
3586 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3587 &dst->remote_ip,
3588 NUD_REACHABLE | NUD_PERMANENT,
3589 vxlan->cfg.dst_port,
3590 dst->remote_vni,
3591 dst->remote_vni,
3592 dst->remote_ifindex,
3593 NTF_SELF, &f);
3594 if (err)
3595 return err;
3596 }
3597
3598 err = register_netdevice(dev);
3599 if (err)
3600 goto errout;
3601 unregister = true;
3602
3603 if (dst->remote_ifindex) {
3604 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3605 if (!remote_dev)
3606 goto errout;
3607
3608 err = netdev_upper_dev_link(remote_dev, dev, extack);
3609 if (err)
3610 goto errout;
3611 }
3612
3613 err = rtnl_configure_link(dev, NULL);
3614 if (err)
3615 goto unlink;
3616
3617 if (f) {
3618 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3619
3620 /* notify default fdb entry */
3621 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3622 RTM_NEWNEIGH, true, extack);
3623 if (err) {
3624 vxlan_fdb_destroy(vxlan, f, false, false);
3625 if (remote_dev)
3626 netdev_upper_dev_unlink(remote_dev, dev);
3627 goto unregister;
3628 }
3629 }
3630
3631 list_add(&vxlan->next, &vn->vxlan_list);
3632 if (remote_dev)
3633 dst->remote_dev = remote_dev;
3634 return 0;
3635unlink:
3636 if (remote_dev)
3637 netdev_upper_dev_unlink(remote_dev, dev);
3638errout:
3639 /* unregister_netdevice() destroys the default FDB entry with deletion
3640 * notification. But the addition notification was not sent yet, so
3641 * destroy the entry by hand here.
3642 */
3643 if (f)
3644 __vxlan_fdb_free(f);
3645unregister:
3646 if (unregister)
3647 unregister_netdevice(dev);
3648 return err;
3649}
3650
3651/* Set/clear flags based on attribute */
3652static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3653 int attrtype, unsigned long mask, bool changelink,
3654 bool changelink_supported,
3655 struct netlink_ext_ack *extack)
3656{
3657 unsigned long flags;
3658
3659 if (!tb[attrtype])
3660 return 0;
3661
3662 if (changelink && !changelink_supported) {
3663 vxlan_flag_attr_error(attrtype, extack);
3664 return -EOPNOTSUPP;
3665 }
3666
3667 if (vxlan_policy[attrtype].type == NLA_FLAG)
3668 flags = conf->flags | mask;
3669 else if (nla_get_u8(tb[attrtype]))
3670 flags = conf->flags | mask;
3671 else
3672 flags = conf->flags & ~mask;
3673
3674 conf->flags = flags;
3675
3676 return 0;
3677}
3678
3679static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3680 struct net_device *dev, struct vxlan_config *conf,
3681 bool changelink, struct netlink_ext_ack *extack)
3682{
3683 struct vxlan_dev *vxlan = netdev_priv(dev);
3684 int err = 0;
3685
3686 memset(conf, 0, sizeof(*conf));
3687
3688 /* if changelink operation, start with old existing cfg */
3689 if (changelink)
3690 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3691
3692 if (data[IFLA_VXLAN_ID]) {
3693 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3694
3695 if (changelink && (vni != conf->vni)) {
3696 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3697 return -EOPNOTSUPP;
3698 }
3699 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3700 }
3701
3702 if (data[IFLA_VXLAN_GROUP]) {
3703 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3704 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3705 return -EOPNOTSUPP;
3706 }
3707
3708 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3709 conf->remote_ip.sa.sa_family = AF_INET;
3710 } else if (data[IFLA_VXLAN_GROUP6]) {
3711 if (!IS_ENABLED(CONFIG_IPV6)) {
3712 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3713 return -EPFNOSUPPORT;
3714 }
3715
3716 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3717 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3718 return -EOPNOTSUPP;
3719 }
3720
3721 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3722 conf->remote_ip.sa.sa_family = AF_INET6;
3723 }
3724
3725 if (data[IFLA_VXLAN_LOCAL]) {
3726 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3727 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3728 return -EOPNOTSUPP;
3729 }
3730
3731 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3732 conf->saddr.sa.sa_family = AF_INET;
3733 } else if (data[IFLA_VXLAN_LOCAL6]) {
3734 if (!IS_ENABLED(CONFIG_IPV6)) {
3735 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3736 return -EPFNOSUPPORT;
3737 }
3738
3739 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3740 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3741 return -EOPNOTSUPP;
3742 }
3743
3744 /* TODO: respect scope id */
3745 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3746 conf->saddr.sa.sa_family = AF_INET6;
3747 }
3748
3749 if (data[IFLA_VXLAN_LINK])
3750 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3751
3752 if (data[IFLA_VXLAN_TOS])
3753 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3754
3755 if (data[IFLA_VXLAN_TTL])
3756 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3757
3758 if (data[IFLA_VXLAN_TTL_INHERIT]) {
3759 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3760 VXLAN_F_TTL_INHERIT, changelink, false,
3761 extack);
3762 if (err)
3763 return err;
3764
3765 }
3766
3767 if (data[IFLA_VXLAN_LABEL])
3768 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3769 IPV6_FLOWLABEL_MASK;
3770
3771 if (data[IFLA_VXLAN_LEARNING]) {
3772 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
3773 VXLAN_F_LEARN, changelink, true,
3774 extack);
3775 if (err)
3776 return err;
3777 } else if (!changelink) {
3778 /* default to learn on a new device */
3779 conf->flags |= VXLAN_F_LEARN;
3780 }
3781
3782 if (data[IFLA_VXLAN_AGEING])
3783 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3784
3785 if (data[IFLA_VXLAN_PROXY]) {
3786 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
3787 VXLAN_F_PROXY, changelink, false,
3788 extack);
3789 if (err)
3790 return err;
3791 }
3792
3793 if (data[IFLA_VXLAN_RSC]) {
3794 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
3795 VXLAN_F_RSC, changelink, false,
3796 extack);
3797 if (err)
3798 return err;
3799 }
3800
3801 if (data[IFLA_VXLAN_L2MISS]) {
3802 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
3803 VXLAN_F_L2MISS, changelink, false,
3804 extack);
3805 if (err)
3806 return err;
3807 }
3808
3809 if (data[IFLA_VXLAN_L3MISS]) {
3810 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
3811 VXLAN_F_L3MISS, changelink, false,
3812 extack);
3813 if (err)
3814 return err;
3815 }
3816
3817 if (data[IFLA_VXLAN_LIMIT]) {
3818 if (changelink) {
3819 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
3820 "Cannot change limit");
3821 return -EOPNOTSUPP;
3822 }
3823 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3824 }
3825
3826 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3827 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
3828 VXLAN_F_COLLECT_METADATA, changelink, false,
3829 extack);
3830 if (err)
3831 return err;
3832 }
3833
3834 if (data[IFLA_VXLAN_PORT_RANGE]) {
3835 if (!changelink) {
3836 const struct ifla_vxlan_port_range *p
3837 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3838 conf->port_min = ntohs(p->low);
3839 conf->port_max = ntohs(p->high);
3840 } else {
3841 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3842 "Cannot change port range");
3843 return -EOPNOTSUPP;
3844 }
3845 }
3846
3847 if (data[IFLA_VXLAN_PORT]) {
3848 if (changelink) {
3849 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
3850 "Cannot change port");
3851 return -EOPNOTSUPP;
3852 }
3853 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3854 }
3855
3856 if (data[IFLA_VXLAN_UDP_CSUM]) {
3857 if (changelink) {
3858 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
3859 "Cannot change UDP_CSUM flag");
3860 return -EOPNOTSUPP;
3861 }
3862 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3863 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3864 }
3865
3866 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3867 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3868 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
3869 false, extack);
3870 if (err)
3871 return err;
3872 }
3873
3874 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3875 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3876 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
3877 false, extack);
3878 if (err)
3879 return err;
3880 }
3881
3882 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3883 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
3884 VXLAN_F_REMCSUM_TX, changelink, false,
3885 extack);
3886 if (err)
3887 return err;
3888 }
3889
3890 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3891 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
3892 VXLAN_F_REMCSUM_RX, changelink, false,
3893 extack);
3894 if (err)
3895 return err;
3896 }
3897
3898 if (data[IFLA_VXLAN_GBP]) {
3899 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
3900 VXLAN_F_GBP, changelink, false, extack);
3901 if (err)
3902 return err;
3903 }
3904
3905 if (data[IFLA_VXLAN_GPE]) {
3906 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
3907 VXLAN_F_GPE, changelink, false,
3908 extack);
3909 if (err)
3910 return err;
3911 }
3912
3913 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3914 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
3915 VXLAN_F_REMCSUM_NOPARTIAL, changelink,
3916 false, extack);
3917 if (err)
3918 return err;
3919 }
3920
3921 if (tb[IFLA_MTU]) {
3922 if (changelink) {
3923 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3924 "Cannot change mtu");
3925 return -EOPNOTSUPP;
3926 }
3927 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3928 }
3929
3930 if (data[IFLA_VXLAN_DF])
3931 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
3932
3933 return 0;
3934}
3935
3936static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3937 struct nlattr *tb[], struct nlattr *data[],
3938 struct netlink_ext_ack *extack)
3939{
3940 struct vxlan_config conf;
3941 int err;
3942
3943 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
3944 if (err)
3945 return err;
3946
3947 return __vxlan_dev_create(src_net, dev, &conf, extack);
3948}
3949
3950static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3951 struct nlattr *data[],
3952 struct netlink_ext_ack *extack)
3953{
3954 struct vxlan_dev *vxlan = netdev_priv(dev);
3955 struct net_device *lowerdev;
3956 struct vxlan_config conf;
3957 struct vxlan_rdst *dst;
3958 int err;
3959
3960 dst = &vxlan->default_dst;
3961 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
3962 if (err)
3963 return err;
3964
3965 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
3966 vxlan, extack);
3967 if (err)
3968 return err;
3969
3970 if (dst->remote_dev == lowerdev)
3971 lowerdev = NULL;
3972
3973 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
3974 extack);
3975 if (err)
3976 return err;
3977
3978 /* handle default dst entry */
3979 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
3980 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
3981
3982 spin_lock_bh(&vxlan->hash_lock[hash_index]);
3983 if (!vxlan_addr_any(&conf.remote_ip)) {
3984 err = vxlan_fdb_update(vxlan, all_zeros_mac,
3985 &conf.remote_ip,
3986 NUD_REACHABLE | NUD_PERMANENT,
3987 NLM_F_APPEND | NLM_F_CREATE,
3988 vxlan->cfg.dst_port,
3989 conf.vni, conf.vni,
3990 conf.remote_ifindex,
3991 NTF_SELF, true, extack);
3992 if (err) {
3993 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3994 netdev_adjacent_change_abort(dst->remote_dev,
3995 lowerdev, dev);
3996 return err;
3997 }
3998 }
3999 if (!vxlan_addr_any(&dst->remote_ip))
4000 __vxlan_fdb_delete(vxlan, all_zeros_mac,
4001 dst->remote_ip,
4002 vxlan->cfg.dst_port,
4003 dst->remote_vni,
4004 dst->remote_vni,
4005 dst->remote_ifindex,
4006 true);
4007 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4008 }
4009
4010 if (conf.age_interval != vxlan->cfg.age_interval)
4011 mod_timer(&vxlan->age_timer, jiffies);
4012
4013 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4014 if (lowerdev && lowerdev != dst->remote_dev) {
4015 dst->remote_dev = lowerdev;
4016 netdev_update_lockdep_key(lowerdev);
4017 }
4018 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4019 return 0;
4020}
4021
4022static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4023{
4024 struct vxlan_dev *vxlan = netdev_priv(dev);
4025
4026 vxlan_flush(vxlan, true);
4027
4028 list_del(&vxlan->next);
4029 unregister_netdevice_queue(dev, head);
4030 if (vxlan->default_dst.remote_dev)
4031 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4032}
4033
4034static size_t vxlan_get_size(const struct net_device *dev)
4035{
4036
4037 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
4038 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4039 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4040 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4041 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
4042 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
4043 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
4044 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
4045 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4046 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
4047 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
4048 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
4049 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
4050 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
4051 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
4052 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4053 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4054 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4055 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4056 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4057 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4058 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4059 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4060 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4061 0;
4062}
4063
4064static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4065{
4066 const struct vxlan_dev *vxlan = netdev_priv(dev);
4067 const struct vxlan_rdst *dst = &vxlan->default_dst;
4068 struct ifla_vxlan_port_range ports = {
4069 .low = htons(vxlan->cfg.port_min),
4070 .high = htons(vxlan->cfg.port_max),
4071 };
4072
4073 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4074 goto nla_put_failure;
4075
4076 if (!vxlan_addr_any(&dst->remote_ip)) {
4077 if (dst->remote_ip.sa.sa_family == AF_INET) {
4078 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4079 dst->remote_ip.sin.sin_addr.s_addr))
4080 goto nla_put_failure;
4081#if IS_ENABLED(CONFIG_IPV6)
4082 } else {
4083 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4084 &dst->remote_ip.sin6.sin6_addr))
4085 goto nla_put_failure;
4086#endif
4087 }
4088 }
4089
4090 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4091 goto nla_put_failure;
4092
4093 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4094 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4095 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4096 vxlan->cfg.saddr.sin.sin_addr.s_addr))
4097 goto nla_put_failure;
4098#if IS_ENABLED(CONFIG_IPV6)
4099 } else {
4100 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4101 &vxlan->cfg.saddr.sin6.sin6_addr))
4102 goto nla_put_failure;
4103#endif
4104 }
4105 }
4106
4107 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4108 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4109 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4110 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4111 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4112 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4113 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4114 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4115 nla_put_u8(skb, IFLA_VXLAN_PROXY,
4116 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4117 nla_put_u8(skb, IFLA_VXLAN_RSC,
4118 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4119 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4120 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4121 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4122 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4123 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4124 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4125 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4126 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4127 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4128 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4129 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4130 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4131 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4132 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4133 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4134 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4135 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4136 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4137 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4138 goto nla_put_failure;
4139
4140 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4141 goto nla_put_failure;
4142
4143 if (vxlan->cfg.flags & VXLAN_F_GBP &&
4144 nla_put_flag(skb, IFLA_VXLAN_GBP))
4145 goto nla_put_failure;
4146
4147 if (vxlan->cfg.flags & VXLAN_F_GPE &&
4148 nla_put_flag(skb, IFLA_VXLAN_GPE))
4149 goto nla_put_failure;
4150
4151 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4152 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4153 goto nla_put_failure;
4154
4155 return 0;
4156
4157nla_put_failure:
4158 return -EMSGSIZE;
4159}
4160
4161static struct net *vxlan_get_link_net(const struct net_device *dev)
4162{
4163 struct vxlan_dev *vxlan = netdev_priv(dev);
4164
4165 return vxlan->net;
4166}
4167
4168static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4169 .kind = "vxlan",
4170 .maxtype = IFLA_VXLAN_MAX,
4171 .policy = vxlan_policy,
4172 .priv_size = sizeof(struct vxlan_dev),
4173 .setup = vxlan_setup,
4174 .validate = vxlan_validate,
4175 .newlink = vxlan_newlink,
4176 .changelink = vxlan_changelink,
4177 .dellink = vxlan_dellink,
4178 .get_size = vxlan_get_size,
4179 .fill_info = vxlan_fill_info,
4180 .get_link_net = vxlan_get_link_net,
4181};
4182
4183struct net_device *vxlan_dev_create(struct net *net, const char *name,
4184 u8 name_assign_type,
4185 struct vxlan_config *conf)
4186{
4187 struct nlattr *tb[IFLA_MAX + 1];
4188 struct net_device *dev;
4189 int err;
4190
4191 memset(&tb, 0, sizeof(tb));
4192
4193 dev = rtnl_create_link(net, name, name_assign_type,
4194 &vxlan_link_ops, tb, NULL);
4195 if (IS_ERR(dev))
4196 return dev;
4197
4198 err = __vxlan_dev_create(net, dev, conf, NULL);
4199 if (err < 0) {
4200 free_netdev(dev);
4201 return ERR_PTR(err);
4202 }
4203
4204 err = rtnl_configure_link(dev, NULL);
4205 if (err < 0) {
4206 LIST_HEAD(list_kill);
4207
4208 vxlan_dellink(dev, &list_kill);
4209 unregister_netdevice_many(&list_kill);
4210 return ERR_PTR(err);
4211 }
4212
4213 return dev;
4214}
4215EXPORT_SYMBOL_GPL(vxlan_dev_create);
4216
4217static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4218 struct net_device *dev)
4219{
4220 struct vxlan_dev *vxlan, *next;
4221 LIST_HEAD(list_kill);
4222
4223 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4224 struct vxlan_rdst *dst = &vxlan->default_dst;
4225
4226 /* In case we created vxlan device with carrier
4227 * and we loose the carrier due to module unload
4228 * we also need to remove vxlan device. In other
4229 * cases, it's not necessary and remote_ifindex
4230 * is 0 here, so no matches.
4231 */
4232 if (dst->remote_ifindex == dev->ifindex)
4233 vxlan_dellink(vxlan->dev, &list_kill);
4234 }
4235
4236 unregister_netdevice_many(&list_kill);
4237}
4238
4239static int vxlan_netdevice_event(struct notifier_block *unused,
4240 unsigned long event, void *ptr)
4241{
4242 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4243 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4244
4245 if (event == NETDEV_UNREGISTER) {
4246 vxlan_offload_rx_ports(dev, false);
4247 vxlan_handle_lowerdev_unregister(vn, dev);
4248 } else if (event == NETDEV_REGISTER) {
4249 vxlan_offload_rx_ports(dev, true);
4250 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4251 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4252 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4253 }
4254
4255 return NOTIFY_DONE;
4256}
4257
4258static struct notifier_block vxlan_notifier_block __read_mostly = {
4259 .notifier_call = vxlan_netdevice_event,
4260};
4261
4262static void
4263vxlan_fdb_offloaded_set(struct net_device *dev,
4264 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4265{
4266 struct vxlan_dev *vxlan = netdev_priv(dev);
4267 struct vxlan_rdst *rdst;
4268 struct vxlan_fdb *f;
4269 u32 hash_index;
4270
4271 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4272
4273 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4274
4275 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4276 if (!f)
4277 goto out;
4278
4279 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4280 fdb_info->remote_port,
4281 fdb_info->remote_vni,
4282 fdb_info->remote_ifindex);
4283 if (!rdst)
4284 goto out;
4285
4286 rdst->offloaded = fdb_info->offloaded;
4287
4288out:
4289 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4290}
4291
4292static int
4293vxlan_fdb_external_learn_add(struct net_device *dev,
4294 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4295{
4296 struct vxlan_dev *vxlan = netdev_priv(dev);
4297 struct netlink_ext_ack *extack;
4298 u32 hash_index;
4299 int err;
4300
4301 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4302 extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4303
4304 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4305 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4306 NUD_REACHABLE,
4307 NLM_F_CREATE | NLM_F_REPLACE,
4308 fdb_info->remote_port,
4309 fdb_info->vni,
4310 fdb_info->remote_vni,
4311 fdb_info->remote_ifindex,
4312 NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4313 false, extack);
4314 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4315
4316 return err;
4317}
4318
4319static int
4320vxlan_fdb_external_learn_del(struct net_device *dev,
4321 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4322{
4323 struct vxlan_dev *vxlan = netdev_priv(dev);
4324 struct vxlan_fdb *f;
4325 u32 hash_index;
4326 int err = 0;
4327
4328 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4329 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4330
4331 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4332 if (!f)
4333 err = -ENOENT;
4334 else if (f->flags & NTF_EXT_LEARNED)
4335 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4336 fdb_info->remote_ip,
4337 fdb_info->remote_port,
4338 fdb_info->vni,
4339 fdb_info->remote_vni,
4340 fdb_info->remote_ifindex,
4341 false);
4342
4343 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4344
4345 return err;
4346}
4347
4348static int vxlan_switchdev_event(struct notifier_block *unused,
4349 unsigned long event, void *ptr)
4350{
4351 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4352 struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4353 int err = 0;
4354
4355 switch (event) {
4356 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4357 vxlan_fdb_offloaded_set(dev, ptr);
4358 break;
4359 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4360 fdb_info = ptr;
4361 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4362 if (err) {
4363 err = notifier_from_errno(err);
4364 break;
4365 }
4366 fdb_info->offloaded = true;
4367 vxlan_fdb_offloaded_set(dev, fdb_info);
4368 break;
4369 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4370 fdb_info = ptr;
4371 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4372 if (err) {
4373 err = notifier_from_errno(err);
4374 break;
4375 }
4376 fdb_info->offloaded = false;
4377 vxlan_fdb_offloaded_set(dev, fdb_info);
4378 break;
4379 }
4380
4381 return err;
4382}
4383
4384static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4385 .notifier_call = vxlan_switchdev_event,
4386};
4387
4388static __net_init int vxlan_init_net(struct net *net)
4389{
4390 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4391 unsigned int h;
4392
4393 INIT_LIST_HEAD(&vn->vxlan_list);
4394 spin_lock_init(&vn->sock_lock);
4395
4396 for (h = 0; h < PORT_HASH_SIZE; ++h)
4397 INIT_HLIST_HEAD(&vn->sock_list[h]);
4398
4399 return 0;
4400}
4401
4402static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4403{
4404 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4405 struct vxlan_dev *vxlan, *next;
4406 struct net_device *dev, *aux;
4407 unsigned int h;
4408
4409 for_each_netdev_safe(net, dev, aux)
4410 if (dev->rtnl_link_ops == &vxlan_link_ops)
4411 unregister_netdevice_queue(dev, head);
4412
4413 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4414 /* If vxlan->dev is in the same netns, it has already been added
4415 * to the list by the previous loop.
4416 */
4417 if (!net_eq(dev_net(vxlan->dev), net))
4418 unregister_netdevice_queue(vxlan->dev, head);
4419 }
4420
4421 for (h = 0; h < PORT_HASH_SIZE; ++h)
4422 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4423}
4424
4425static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4426{
4427 struct net *net;
4428 LIST_HEAD(list);
4429
4430 rtnl_lock();
4431 list_for_each_entry(net, net_list, exit_list)
4432 vxlan_destroy_tunnels(net, &list);
4433
4434 unregister_netdevice_many(&list);
4435 rtnl_unlock();
4436}
4437
4438static struct pernet_operations vxlan_net_ops = {
4439 .init = vxlan_init_net,
4440 .exit_batch = vxlan_exit_batch_net,
4441 .id = &vxlan_net_id,
4442 .size = sizeof(struct vxlan_net),
4443};
4444
4445static int __init vxlan_init_module(void)
4446{
4447 int rc;
4448
4449 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4450
4451 rc = register_pernet_subsys(&vxlan_net_ops);
4452 if (rc)
4453 goto out1;
4454
4455 rc = register_netdevice_notifier(&vxlan_notifier_block);
4456 if (rc)
4457 goto out2;
4458
4459 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4460 if (rc)
4461 goto out3;
4462
4463 rc = rtnl_link_register(&vxlan_link_ops);
4464 if (rc)
4465 goto out4;
4466
4467 return 0;
4468out4:
4469 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4470out3:
4471 unregister_netdevice_notifier(&vxlan_notifier_block);
4472out2:
4473 unregister_pernet_subsys(&vxlan_net_ops);
4474out1:
4475 return rc;
4476}
4477late_initcall(vxlan_init_module);
4478
4479static void __exit vxlan_cleanup_module(void)
4480{
4481 rtnl_link_unregister(&vxlan_link_ops);
4482 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4483 unregister_netdevice_notifier(&vxlan_notifier_block);
4484 unregister_pernet_subsys(&vxlan_net_ops);
4485 /* rcu_barrier() is called by netns */
4486}
4487module_exit(vxlan_cleanup_module);
4488
4489MODULE_LICENSE("GPL");
4490MODULE_VERSION(VXLAN_VERSION);
4491MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4492MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4493MODULE_ALIAS_RTNL_LINK("vxlan");