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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/types.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/rculist.h>
20#include <linux/netdevice.h>
21#include <linux/in.h>
22#include <linux/ip.h>
23#include <linux/udp.h>
24#include <linux/igmp.h>
25#include <linux/etherdevice.h>
26#include <linux/if_ether.h>
27#include <linux/if_vlan.h>
28#include <linux/hash.h>
29#include <linux/ethtool.h>
30#include <net/arp.h>
31#include <net/ndisc.h>
32#include <net/ip.h>
33#include <net/ip_tunnels.h>
34#include <net/icmp.h>
35#include <net/udp.h>
36#include <net/udp_tunnel.h>
37#include <net/rtnetlink.h>
38#include <net/route.h>
39#include <net/dsfield.h>
40#include <net/inet_ecn.h>
41#include <net/net_namespace.h>
42#include <net/netns/generic.h>
43#include <net/vxlan.h>
44#include <net/protocol.h>
45
46#if IS_ENABLED(CONFIG_IPV6)
47#include <net/ipv6.h>
48#include <net/addrconf.h>
49#include <net/ip6_tunnel.h>
50#include <net/ip6_checksum.h>
51#endif
52#include <net/dst_metadata.h>
53
54#define VXLAN_VERSION "0.1"
55
56#define PORT_HASH_BITS 8
57#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
58#define FDB_AGE_DEFAULT 300 /* 5 min */
59#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
61/* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
63 * for compatibility with early adopters.
64 */
65static unsigned short vxlan_port __read_mostly = 8472;
66module_param_named(udp_port, vxlan_port, ushort, 0444);
67MODULE_PARM_DESC(udp_port, "Destination UDP port");
68
69static bool log_ecn_error = true;
70module_param(log_ecn_error, bool, 0644);
71MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
72
73static int vxlan_net_id;
74static struct rtnl_link_ops vxlan_link_ops;
75
76static const u8 all_zeros_mac[ETH_ALEN + 2];
77
78static int vxlan_sock_add(struct vxlan_dev *vxlan);
79
80/* per-network namespace private data for this module */
81struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
84 spinlock_t sock_lock;
85};
86
87/* Forwarding table entry */
88struct vxlan_fdb {
89 struct hlist_node hlist; /* linked list of entries */
90 struct rcu_head rcu;
91 unsigned long updated; /* jiffies */
92 unsigned long used;
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
97};
98
99/* salt for hash table */
100static u32 vxlan_salt __read_mostly;
101static struct workqueue_struct *vxlan_wq;
102
103static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104{
105 return vs->flags & VXLAN_F_COLLECT_METADATA ||
106 ip_tunnel_collect_metadata();
107}
108
109#if IS_ENABLED(CONFIG_IPV6)
110static inline
111bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112{
113 if (a->sa.sa_family != b->sa.sa_family)
114 return false;
115 if (a->sa.sa_family == AF_INET6)
116 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117 else
118 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
119}
120
121static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122{
123 if (ipa->sa.sa_family == AF_INET6)
124 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125 else
126 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
127}
128
129static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130{
131 if (ipa->sa.sa_family == AF_INET6)
132 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133 else
134 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
135}
136
137static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138{
139 if (nla_len(nla) >= sizeof(struct in6_addr)) {
140 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141 ip->sa.sa_family = AF_INET6;
142 return 0;
143 } else if (nla_len(nla) >= sizeof(__be32)) {
144 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145 ip->sa.sa_family = AF_INET;
146 return 0;
147 } else {
148 return -EAFNOSUPPORT;
149 }
150}
151
152static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153 const union vxlan_addr *ip)
154{
155 if (ip->sa.sa_family == AF_INET6)
156 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
157 else
158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
159}
160
161#else /* !CONFIG_IPV6 */
162
163static inline
164bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165{
166 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
167}
168
169static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170{
171 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
172}
173
174static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175{
176 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
177}
178
179static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180{
181 if (nla_len(nla) >= sizeof(struct in6_addr)) {
182 return -EAFNOSUPPORT;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
185 ip->sa.sa_family = AF_INET;
186 return 0;
187 } else {
188 return -EAFNOSUPPORT;
189 }
190}
191
192static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193 const union vxlan_addr *ip)
194{
195 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
196}
197#endif
198
199/* Virtual Network hash table head */
200static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
201{
202 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
203}
204
205/* Socket hash table head */
206static inline struct hlist_head *vs_head(struct net *net, __be16 port)
207{
208 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209
210 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
211}
212
213/* First remote destination for a forwarding entry.
214 * Guaranteed to be non-NULL because remotes are never deleted.
215 */
216static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
217{
218 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
219}
220
221static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222{
223 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
224}
225
226/* Find VXLAN socket based on network namespace, address family and UDP port
227 * and enabled unshareable flags.
228 */
229static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230 __be16 port, u32 flags)
231{
232 struct vxlan_sock *vs;
233
234 flags &= VXLAN_F_RCV_FLAGS;
235
236 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238 vxlan_get_sk_family(vs) == family &&
239 vs->flags == flags)
240 return vs;
241 }
242 return NULL;
243}
244
245static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
246{
247 struct vxlan_dev *vxlan;
248
249 /* For flow based devices, map all packets to VNI 0 */
250 if (vs->flags & VXLAN_F_COLLECT_METADATA)
251 vni = 0;
252
253 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
254 if (vxlan->default_dst.remote_vni == vni)
255 return vxlan;
256 }
257
258 return NULL;
259}
260
261/* Look up VNI in a per net namespace table */
262static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
263 sa_family_t family, __be16 port,
264 u32 flags)
265{
266 struct vxlan_sock *vs;
267
268 vs = vxlan_find_sock(net, family, port, flags);
269 if (!vs)
270 return NULL;
271
272 return vxlan_vs_find_vni(vs, vni);
273}
274
275/* Fill in neighbour message in skbuff. */
276static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
277 const struct vxlan_fdb *fdb,
278 u32 portid, u32 seq, int type, unsigned int flags,
279 const struct vxlan_rdst *rdst)
280{
281 unsigned long now = jiffies;
282 struct nda_cacheinfo ci;
283 struct nlmsghdr *nlh;
284 struct ndmsg *ndm;
285 bool send_ip, send_eth;
286
287 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
288 if (nlh == NULL)
289 return -EMSGSIZE;
290
291 ndm = nlmsg_data(nlh);
292 memset(ndm, 0, sizeof(*ndm));
293
294 send_eth = send_ip = true;
295
296 if (type == RTM_GETNEIGH) {
297 ndm->ndm_family = AF_INET;
298 send_ip = !vxlan_addr_any(&rdst->remote_ip);
299 send_eth = !is_zero_ether_addr(fdb->eth_addr);
300 } else
301 ndm->ndm_family = AF_BRIDGE;
302 ndm->ndm_state = fdb->state;
303 ndm->ndm_ifindex = vxlan->dev->ifindex;
304 ndm->ndm_flags = fdb->flags;
305 ndm->ndm_type = RTN_UNICAST;
306
307 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
308 nla_put_s32(skb, NDA_LINK_NETNSID,
309 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
310 goto nla_put_failure;
311
312 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
313 goto nla_put_failure;
314
315 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
316 goto nla_put_failure;
317
318 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
319 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
320 goto nla_put_failure;
321 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
322 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_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
422/* Hash chain to use given mac address */
423static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
424 const u8 *mac)
425{
426 return &vxlan->fdb_head[eth_hash(mac)];
427}
428
429/* Look up Ethernet address in forwarding table */
430static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
431 const u8 *mac)
432{
433 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
434 struct vxlan_fdb *f;
435
436 hlist_for_each_entry_rcu(f, head, hlist) {
437 if (ether_addr_equal(mac, f->eth_addr))
438 return f;
439 }
440
441 return NULL;
442}
443
444static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
445 const u8 *mac)
446{
447 struct vxlan_fdb *f;
448
449 f = __vxlan_find_mac(vxlan, mac);
450 if (f)
451 f->used = jiffies;
452
453 return f;
454}
455
456/* caller should hold vxlan->hash_lock */
457static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
458 union vxlan_addr *ip, __be16 port,
459 __be32 vni, __u32 ifindex)
460{
461 struct vxlan_rdst *rd;
462
463 list_for_each_entry(rd, &f->remotes, list) {
464 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
465 rd->remote_port == port &&
466 rd->remote_vni == vni &&
467 rd->remote_ifindex == ifindex)
468 return rd;
469 }
470
471 return NULL;
472}
473
474/* Replace destination of unicast mac */
475static int vxlan_fdb_replace(struct vxlan_fdb *f,
476 union vxlan_addr *ip, __be16 port, __be32 vni,
477 __u32 ifindex)
478{
479 struct vxlan_rdst *rd;
480
481 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
482 if (rd)
483 return 0;
484
485 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
486 if (!rd)
487 return 0;
488
489 dst_cache_reset(&rd->dst_cache);
490 rd->remote_ip = *ip;
491 rd->remote_port = port;
492 rd->remote_vni = vni;
493 rd->remote_ifindex = ifindex;
494 return 1;
495}
496
497/* Add/update destinations for multicast */
498static int vxlan_fdb_append(struct vxlan_fdb *f,
499 union vxlan_addr *ip, __be16 port, __be32 vni,
500 __u32 ifindex, struct vxlan_rdst **rdp)
501{
502 struct vxlan_rdst *rd;
503
504 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
505 if (rd)
506 return 0;
507
508 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
509 if (rd == NULL)
510 return -ENOBUFS;
511
512 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
513 kfree(rd);
514 return -ENOBUFS;
515 }
516
517 rd->remote_ip = *ip;
518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
521
522 list_add_tail_rcu(&rd->list, &f->remotes);
523
524 *rdp = rd;
525 return 1;
526}
527
528static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
529 unsigned int off,
530 struct vxlanhdr *vh, size_t hdrlen,
531 __be32 vni_field,
532 struct gro_remcsum *grc,
533 bool nopartial)
534{
535 size_t start, offset;
536
537 if (skb->remcsum_offload)
538 return vh;
539
540 if (!NAPI_GRO_CB(skb)->csum_valid)
541 return NULL;
542
543 start = vxlan_rco_start(vni_field);
544 offset = start + vxlan_rco_offset(vni_field);
545
546 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
547 start, offset, grc, nopartial);
548
549 skb->remcsum_offload = 1;
550
551 return vh;
552}
553
554static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
555 struct sk_buff *skb,
556 struct udp_offload *uoff)
557{
558 struct sk_buff *p, **pp = NULL;
559 struct vxlanhdr *vh, *vh2;
560 unsigned int hlen, off_vx;
561 int flush = 1;
562 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
563 udp_offloads);
564 __be32 flags;
565 struct gro_remcsum grc;
566
567 skb_gro_remcsum_init(&grc);
568
569 off_vx = skb_gro_offset(skb);
570 hlen = off_vx + sizeof(*vh);
571 vh = skb_gro_header_fast(skb, off_vx);
572 if (skb_gro_header_hard(skb, hlen)) {
573 vh = skb_gro_header_slow(skb, hlen, off_vx);
574 if (unlikely(!vh))
575 goto out;
576 }
577
578 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
579
580 flags = vh->vx_flags;
581
582 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
583 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
584 vh->vx_vni, &grc,
585 !!(vs->flags &
586 VXLAN_F_REMCSUM_NOPARTIAL));
587
588 if (!vh)
589 goto out;
590 }
591
592 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
593
594 for (p = *head; p; p = p->next) {
595 if (!NAPI_GRO_CB(p)->same_flow)
596 continue;
597
598 vh2 = (struct vxlanhdr *)(p->data + off_vx);
599 if (vh->vx_flags != vh2->vx_flags ||
600 vh->vx_vni != vh2->vx_vni) {
601 NAPI_GRO_CB(p)->same_flow = 0;
602 continue;
603 }
604 }
605
606 pp = eth_gro_receive(head, skb);
607 flush = 0;
608
609out:
610 skb_gro_remcsum_cleanup(skb, &grc);
611 NAPI_GRO_CB(skb)->flush |= flush;
612
613 return pp;
614}
615
616static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
617 struct udp_offload *uoff)
618{
619 /* Sets 'skb->inner_mac_header' since we are always called with
620 * 'skb->encapsulation' set.
621 */
622 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
623}
624
625/* Notify netdevs that UDP port started listening */
626static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
627{
628 struct net_device *dev;
629 struct sock *sk = vs->sock->sk;
630 struct net *net = sock_net(sk);
631 sa_family_t sa_family = vxlan_get_sk_family(vs);
632 __be16 port = inet_sk(sk)->inet_sport;
633 int err;
634
635 if (sa_family == AF_INET) {
636 err = udp_add_offload(net, &vs->udp_offloads);
637 if (err)
638 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
639 }
640
641 rcu_read_lock();
642 for_each_netdev_rcu(net, dev) {
643 if (dev->netdev_ops->ndo_add_vxlan_port)
644 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
645 port);
646 }
647 rcu_read_unlock();
648}
649
650/* Notify netdevs that UDP port is no more listening */
651static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
652{
653 struct net_device *dev;
654 struct sock *sk = vs->sock->sk;
655 struct net *net = sock_net(sk);
656 sa_family_t sa_family = vxlan_get_sk_family(vs);
657 __be16 port = inet_sk(sk)->inet_sport;
658
659 rcu_read_lock();
660 for_each_netdev_rcu(net, dev) {
661 if (dev->netdev_ops->ndo_del_vxlan_port)
662 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
663 port);
664 }
665 rcu_read_unlock();
666
667 if (sa_family == AF_INET)
668 udp_del_offload(&vs->udp_offloads);
669}
670
671/* Add new entry to forwarding table -- assumes lock held */
672static int vxlan_fdb_create(struct vxlan_dev *vxlan,
673 const u8 *mac, union vxlan_addr *ip,
674 __u16 state, __u16 flags,
675 __be16 port, __be32 vni, __u32 ifindex,
676 __u8 ndm_flags)
677{
678 struct vxlan_rdst *rd = NULL;
679 struct vxlan_fdb *f;
680 int notify = 0;
681
682 f = __vxlan_find_mac(vxlan, mac);
683 if (f) {
684 if (flags & NLM_F_EXCL) {
685 netdev_dbg(vxlan->dev,
686 "lost race to create %pM\n", mac);
687 return -EEXIST;
688 }
689 if (f->state != state) {
690 f->state = state;
691 f->updated = jiffies;
692 notify = 1;
693 }
694 if (f->flags != ndm_flags) {
695 f->flags = ndm_flags;
696 f->updated = jiffies;
697 notify = 1;
698 }
699 if ((flags & NLM_F_REPLACE)) {
700 /* Only change unicasts */
701 if (!(is_multicast_ether_addr(f->eth_addr) ||
702 is_zero_ether_addr(f->eth_addr))) {
703 notify |= vxlan_fdb_replace(f, ip, port, vni,
704 ifindex);
705 } else
706 return -EOPNOTSUPP;
707 }
708 if ((flags & NLM_F_APPEND) &&
709 (is_multicast_ether_addr(f->eth_addr) ||
710 is_zero_ether_addr(f->eth_addr))) {
711 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
712 &rd);
713
714 if (rc < 0)
715 return rc;
716 notify |= rc;
717 }
718 } else {
719 if (!(flags & NLM_F_CREATE))
720 return -ENOENT;
721
722 if (vxlan->cfg.addrmax &&
723 vxlan->addrcnt >= vxlan->cfg.addrmax)
724 return -ENOSPC;
725
726 /* Disallow replace to add a multicast entry */
727 if ((flags & NLM_F_REPLACE) &&
728 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
729 return -EOPNOTSUPP;
730
731 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
732 f = kmalloc(sizeof(*f), GFP_ATOMIC);
733 if (!f)
734 return -ENOMEM;
735
736 notify = 1;
737 f->state = state;
738 f->flags = ndm_flags;
739 f->updated = f->used = jiffies;
740 INIT_LIST_HEAD(&f->remotes);
741 memcpy(f->eth_addr, mac, ETH_ALEN);
742
743 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
744
745 ++vxlan->addrcnt;
746 hlist_add_head_rcu(&f->hlist,
747 vxlan_fdb_head(vxlan, mac));
748 }
749
750 if (notify) {
751 if (rd == NULL)
752 rd = first_remote_rtnl(f);
753 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
754 }
755
756 return 0;
757}
758
759static void vxlan_fdb_free(struct rcu_head *head)
760{
761 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
762 struct vxlan_rdst *rd, *nd;
763
764 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
765 dst_cache_destroy(&rd->dst_cache);
766 kfree(rd);
767 }
768 kfree(f);
769}
770
771static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
772{
773 netdev_dbg(vxlan->dev,
774 "delete %pM\n", f->eth_addr);
775
776 --vxlan->addrcnt;
777 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
778
779 hlist_del_rcu(&f->hlist);
780 call_rcu(&f->rcu, vxlan_fdb_free);
781}
782
783static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
784 union vxlan_addr *ip, __be16 *port, __be32 *vni,
785 u32 *ifindex)
786{
787 struct net *net = dev_net(vxlan->dev);
788 int err;
789
790 if (tb[NDA_DST]) {
791 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
792 if (err)
793 return err;
794 } else {
795 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
796 if (remote->sa.sa_family == AF_INET) {
797 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
798 ip->sa.sa_family = AF_INET;
799#if IS_ENABLED(CONFIG_IPV6)
800 } else {
801 ip->sin6.sin6_addr = in6addr_any;
802 ip->sa.sa_family = AF_INET6;
803#endif
804 }
805 }
806
807 if (tb[NDA_PORT]) {
808 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
809 return -EINVAL;
810 *port = nla_get_be16(tb[NDA_PORT]);
811 } else {
812 *port = vxlan->cfg.dst_port;
813 }
814
815 if (tb[NDA_VNI]) {
816 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
817 return -EINVAL;
818 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
819 } else {
820 *vni = vxlan->default_dst.remote_vni;
821 }
822
823 if (tb[NDA_IFINDEX]) {
824 struct net_device *tdev;
825
826 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
827 return -EINVAL;
828 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
829 tdev = __dev_get_by_index(net, *ifindex);
830 if (!tdev)
831 return -EADDRNOTAVAIL;
832 } else {
833 *ifindex = 0;
834 }
835
836 return 0;
837}
838
839/* Add static entry (via netlink) */
840static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
841 struct net_device *dev,
842 const unsigned char *addr, u16 vid, u16 flags)
843{
844 struct vxlan_dev *vxlan = netdev_priv(dev);
845 /* struct net *net = dev_net(vxlan->dev); */
846 union vxlan_addr ip;
847 __be16 port;
848 __be32 vni;
849 u32 ifindex;
850 int err;
851
852 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
853 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
854 ndm->ndm_state);
855 return -EINVAL;
856 }
857
858 if (tb[NDA_DST] == NULL)
859 return -EINVAL;
860
861 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
862 if (err)
863 return err;
864
865 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
866 return -EAFNOSUPPORT;
867
868 spin_lock_bh(&vxlan->hash_lock);
869 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
870 port, vni, ifindex, ndm->ndm_flags);
871 spin_unlock_bh(&vxlan->hash_lock);
872
873 return err;
874}
875
876/* Delete entry (via netlink) */
877static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
878 struct net_device *dev,
879 const unsigned char *addr, u16 vid)
880{
881 struct vxlan_dev *vxlan = netdev_priv(dev);
882 struct vxlan_fdb *f;
883 struct vxlan_rdst *rd = NULL;
884 union vxlan_addr ip;
885 __be16 port;
886 __be32 vni;
887 u32 ifindex;
888 int err;
889
890 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
891 if (err)
892 return err;
893
894 err = -ENOENT;
895
896 spin_lock_bh(&vxlan->hash_lock);
897 f = vxlan_find_mac(vxlan, addr);
898 if (!f)
899 goto out;
900
901 if (!vxlan_addr_any(&ip)) {
902 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
903 if (!rd)
904 goto out;
905 }
906
907 err = 0;
908
909 /* remove a destination if it's not the only one on the list,
910 * otherwise destroy the fdb entry
911 */
912 if (rd && !list_is_singular(&f->remotes)) {
913 list_del_rcu(&rd->list);
914 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
915 kfree_rcu(rd, rcu);
916 goto out;
917 }
918
919 vxlan_fdb_destroy(vxlan, f);
920
921out:
922 spin_unlock_bh(&vxlan->hash_lock);
923
924 return err;
925}
926
927/* Dump forwarding table */
928static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
929 struct net_device *dev,
930 struct net_device *filter_dev, int idx)
931{
932 struct vxlan_dev *vxlan = netdev_priv(dev);
933 unsigned int h;
934
935 for (h = 0; h < FDB_HASH_SIZE; ++h) {
936 struct vxlan_fdb *f;
937 int err;
938
939 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
940 struct vxlan_rdst *rd;
941
942 list_for_each_entry_rcu(rd, &f->remotes, list) {
943 if (idx < cb->args[0])
944 goto skip;
945
946 err = vxlan_fdb_info(skb, vxlan, f,
947 NETLINK_CB(cb->skb).portid,
948 cb->nlh->nlmsg_seq,
949 RTM_NEWNEIGH,
950 NLM_F_MULTI, rd);
951 if (err < 0) {
952 cb->args[1] = err;
953 goto out;
954 }
955skip:
956 ++idx;
957 }
958 }
959 }
960out:
961 return idx;
962}
963
964/* Watch incoming packets to learn mapping between Ethernet address
965 * and Tunnel endpoint.
966 * Return true if packet is bogus and should be dropped.
967 */
968static bool vxlan_snoop(struct net_device *dev,
969 union vxlan_addr *src_ip, const u8 *src_mac)
970{
971 struct vxlan_dev *vxlan = netdev_priv(dev);
972 struct vxlan_fdb *f;
973
974 f = vxlan_find_mac(vxlan, src_mac);
975 if (likely(f)) {
976 struct vxlan_rdst *rdst = first_remote_rcu(f);
977
978 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
979 return false;
980
981 /* Don't migrate static entries, drop packets */
982 if (f->state & NUD_NOARP)
983 return true;
984
985 if (net_ratelimit())
986 netdev_info(dev,
987 "%pM migrated from %pIS to %pIS\n",
988 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
989
990 rdst->remote_ip = *src_ip;
991 f->updated = jiffies;
992 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
993 } else {
994 /* learned new entry */
995 spin_lock(&vxlan->hash_lock);
996
997 /* close off race between vxlan_flush and incoming packets */
998 if (netif_running(dev))
999 vxlan_fdb_create(vxlan, src_mac, src_ip,
1000 NUD_REACHABLE,
1001 NLM_F_EXCL|NLM_F_CREATE,
1002 vxlan->cfg.dst_port,
1003 vxlan->default_dst.remote_vni,
1004 0, NTF_SELF);
1005 spin_unlock(&vxlan->hash_lock);
1006 }
1007
1008 return false;
1009}
1010
1011/* See if multicast group is already in use by other ID */
1012static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1013{
1014 struct vxlan_dev *vxlan;
1015 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1016
1017 /* The vxlan_sock is only used by dev, leaving group has
1018 * no effect on other vxlan devices.
1019 */
1020 if (family == AF_INET && dev->vn4_sock &&
1021 atomic_read(&dev->vn4_sock->refcnt) == 1)
1022 return false;
1023#if IS_ENABLED(CONFIG_IPV6)
1024 if (family == AF_INET6 && dev->vn6_sock &&
1025 atomic_read(&dev->vn6_sock->refcnt) == 1)
1026 return false;
1027#endif
1028
1029 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1030 if (!netif_running(vxlan->dev) || vxlan == dev)
1031 continue;
1032
1033 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1034 continue;
1035#if IS_ENABLED(CONFIG_IPV6)
1036 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1037 continue;
1038#endif
1039
1040 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1041 &dev->default_dst.remote_ip))
1042 continue;
1043
1044 if (vxlan->default_dst.remote_ifindex !=
1045 dev->default_dst.remote_ifindex)
1046 continue;
1047
1048 return true;
1049 }
1050
1051 return false;
1052}
1053
1054static void __vxlan_sock_release(struct vxlan_sock *vs)
1055{
1056 struct vxlan_net *vn;
1057
1058 if (!vs)
1059 return;
1060 if (!atomic_dec_and_test(&vs->refcnt))
1061 return;
1062
1063 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1064 spin_lock(&vn->sock_lock);
1065 hlist_del_rcu(&vs->hlist);
1066 vxlan_notify_del_rx_port(vs);
1067 spin_unlock(&vn->sock_lock);
1068
1069 queue_work(vxlan_wq, &vs->del_work);
1070}
1071
1072static void vxlan_sock_release(struct vxlan_dev *vxlan)
1073{
1074 __vxlan_sock_release(vxlan->vn4_sock);
1075#if IS_ENABLED(CONFIG_IPV6)
1076 __vxlan_sock_release(vxlan->vn6_sock);
1077#endif
1078}
1079
1080/* Update multicast group membership when first VNI on
1081 * multicast address is brought up
1082 */
1083static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1084{
1085 struct sock *sk;
1086 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1087 int ifindex = vxlan->default_dst.remote_ifindex;
1088 int ret = -EINVAL;
1089
1090 if (ip->sa.sa_family == AF_INET) {
1091 struct ip_mreqn mreq = {
1092 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1093 .imr_ifindex = ifindex,
1094 };
1095
1096 sk = vxlan->vn4_sock->sock->sk;
1097 lock_sock(sk);
1098 ret = ip_mc_join_group(sk, &mreq);
1099 release_sock(sk);
1100#if IS_ENABLED(CONFIG_IPV6)
1101 } else {
1102 sk = vxlan->vn6_sock->sock->sk;
1103 lock_sock(sk);
1104 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105 &ip->sin6.sin6_addr);
1106 release_sock(sk);
1107#endif
1108 }
1109
1110 return ret;
1111}
1112
1113/* Inverse of vxlan_igmp_join when last VNI is brought down */
1114static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115{
1116 struct sock *sk;
1117 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1118 int ifindex = vxlan->default_dst.remote_ifindex;
1119 int ret = -EINVAL;
1120
1121 if (ip->sa.sa_family == AF_INET) {
1122 struct ip_mreqn mreq = {
1123 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1124 .imr_ifindex = ifindex,
1125 };
1126
1127 sk = vxlan->vn4_sock->sock->sk;
1128 lock_sock(sk);
1129 ret = ip_mc_leave_group(sk, &mreq);
1130 release_sock(sk);
1131#if IS_ENABLED(CONFIG_IPV6)
1132 } else {
1133 sk = vxlan->vn6_sock->sock->sk;
1134 lock_sock(sk);
1135 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1136 &ip->sin6.sin6_addr);
1137 release_sock(sk);
1138#endif
1139 }
1140
1141 return ret;
1142}
1143
1144static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1145 struct sk_buff *skb, u32 vxflags)
1146{
1147 size_t start, offset;
1148
1149 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1150 goto out;
1151
1152 start = vxlan_rco_start(unparsed->vx_vni);
1153 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1154
1155 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1156 return false;
1157
1158 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1160out:
1161 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162 unparsed->vx_vni &= VXLAN_VNI_MASK;
1163 return true;
1164}
1165
1166static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167 struct sk_buff *skb, u32 vxflags,
1168 struct vxlan_metadata *md)
1169{
1170 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171 struct metadata_dst *tun_dst;
1172
1173 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1174 goto out;
1175
1176 md->gbp = ntohs(gbp->policy_id);
1177
1178 tun_dst = (struct metadata_dst *)skb_dst(skb);
1179 if (tun_dst) {
1180 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1181 tun_dst->u.tun_info.options_len = sizeof(*md);
1182 }
1183 if (gbp->dont_learn)
1184 md->gbp |= VXLAN_GBP_DONT_LEARN;
1185
1186 if (gbp->policy_applied)
1187 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1188
1189 /* In flow-based mode, GBP is carried in dst_metadata */
1190 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1191 skb->mark = md->gbp;
1192out:
1193 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1194}
1195
1196static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1197 struct vxlan_sock *vs,
1198 struct sk_buff *skb)
1199{
1200 union vxlan_addr saddr;
1201
1202 skb_reset_mac_header(skb);
1203 skb->protocol = eth_type_trans(skb, vxlan->dev);
1204 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1205
1206 /* Ignore packet loops (and multicast echo) */
1207 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1208 return false;
1209
1210 /* Get address from the outer IP header */
1211 if (vxlan_get_sk_family(vs) == AF_INET) {
1212 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1213 saddr.sa.sa_family = AF_INET;
1214#if IS_ENABLED(CONFIG_IPV6)
1215 } else {
1216 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1217 saddr.sa.sa_family = AF_INET6;
1218#endif
1219 }
1220
1221 if ((vxlan->flags & VXLAN_F_LEARN) &&
1222 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1223 return false;
1224
1225 return true;
1226}
1227
1228static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1229 struct sk_buff *skb)
1230{
1231 int err = 0;
1232
1233 if (vxlan_get_sk_family(vs) == AF_INET)
1234 err = IP_ECN_decapsulate(oiph, skb);
1235#if IS_ENABLED(CONFIG_IPV6)
1236 else
1237 err = IP6_ECN_decapsulate(oiph, skb);
1238#endif
1239
1240 if (unlikely(err) && log_ecn_error) {
1241 if (vxlan_get_sk_family(vs) == AF_INET)
1242 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1243 &((struct iphdr *)oiph)->saddr,
1244 ((struct iphdr *)oiph)->tos);
1245 else
1246 net_info_ratelimited("non-ECT from %pI6\n",
1247 &((struct ipv6hdr *)oiph)->saddr);
1248 }
1249 return err <= 1;
1250}
1251
1252/* Callback from net/ipv4/udp.c to receive packets */
1253static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1254{
1255 struct pcpu_sw_netstats *stats;
1256 struct vxlan_dev *vxlan;
1257 struct vxlan_sock *vs;
1258 struct vxlanhdr unparsed;
1259 struct vxlan_metadata _md;
1260 struct vxlan_metadata *md = &_md;
1261 void *oiph;
1262
1263 /* Need Vxlan and inner Ethernet header to be present */
1264 if (!pskb_may_pull(skb, VXLAN_HLEN))
1265 return 1;
1266
1267 unparsed = *vxlan_hdr(skb);
1268 /* VNI flag always required to be set */
1269 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1270 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1271 ntohl(vxlan_hdr(skb)->vx_flags),
1272 ntohl(vxlan_hdr(skb)->vx_vni));
1273 /* Return non vxlan pkt */
1274 return 1;
1275 }
1276 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1277 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1278
1279 vs = rcu_dereference_sk_user_data(sk);
1280 if (!vs)
1281 goto drop;
1282
1283 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1284 if (!vxlan)
1285 goto drop;
1286
1287 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1288 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1289 goto drop;
1290
1291 if (vxlan_collect_metadata(vs)) {
1292 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1293 struct metadata_dst *tun_dst;
1294
1295 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1296 vxlan_vni_to_tun_id(vni), sizeof(*md));
1297
1298 if (!tun_dst)
1299 goto drop;
1300
1301 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1302
1303 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1304 } else {
1305 memset(md, 0, sizeof(*md));
1306 }
1307
1308 /* For backwards compatibility, only allow reserved fields to be
1309 * used by VXLAN extensions if explicitly requested.
1310 */
1311 if (vs->flags & VXLAN_F_REMCSUM_RX)
1312 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1313 goto drop;
1314 if (vs->flags & VXLAN_F_GBP)
1315 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1316
1317 if (unparsed.vx_flags || unparsed.vx_vni) {
1318 /* If there are any unprocessed flags remaining treat
1319 * this as a malformed packet. This behavior diverges from
1320 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1321 * in reserved fields are to be ignored. The approach here
1322 * maintains compatibility with previous stack code, and also
1323 * is more robust and provides a little more security in
1324 * adding extensions to VXLAN.
1325 */
1326 goto drop;
1327 }
1328
1329 if (!vxlan_set_mac(vxlan, vs, skb))
1330 goto drop;
1331
1332 oiph = skb_network_header(skb);
1333 skb_reset_network_header(skb);
1334
1335 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1336 ++vxlan->dev->stats.rx_frame_errors;
1337 ++vxlan->dev->stats.rx_errors;
1338 goto drop;
1339 }
1340
1341 stats = this_cpu_ptr(vxlan->dev->tstats);
1342 u64_stats_update_begin(&stats->syncp);
1343 stats->rx_packets++;
1344 stats->rx_bytes += skb->len;
1345 u64_stats_update_end(&stats->syncp);
1346
1347 gro_cells_receive(&vxlan->gro_cells, skb);
1348 return 0;
1349
1350drop:
1351 /* Consume bad packet */
1352 kfree_skb(skb);
1353 return 0;
1354}
1355
1356static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357{
1358 struct vxlan_dev *vxlan = netdev_priv(dev);
1359 struct arphdr *parp;
1360 u8 *arpptr, *sha;
1361 __be32 sip, tip;
1362 struct neighbour *n;
1363
1364 if (dev->flags & IFF_NOARP)
1365 goto out;
1366
1367 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1368 dev->stats.tx_dropped++;
1369 goto out;
1370 }
1371 parp = arp_hdr(skb);
1372
1373 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1374 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1375 parp->ar_pro != htons(ETH_P_IP) ||
1376 parp->ar_op != htons(ARPOP_REQUEST) ||
1377 parp->ar_hln != dev->addr_len ||
1378 parp->ar_pln != 4)
1379 goto out;
1380 arpptr = (u8 *)parp + sizeof(struct arphdr);
1381 sha = arpptr;
1382 arpptr += dev->addr_len; /* sha */
1383 memcpy(&sip, arpptr, sizeof(sip));
1384 arpptr += sizeof(sip);
1385 arpptr += dev->addr_len; /* tha */
1386 memcpy(&tip, arpptr, sizeof(tip));
1387
1388 if (ipv4_is_loopback(tip) ||
1389 ipv4_is_multicast(tip))
1390 goto out;
1391
1392 n = neigh_lookup(&arp_tbl, &tip, dev);
1393
1394 if (n) {
1395 struct vxlan_fdb *f;
1396 struct sk_buff *reply;
1397
1398 if (!(n->nud_state & NUD_CONNECTED)) {
1399 neigh_release(n);
1400 goto out;
1401 }
1402
1403 f = vxlan_find_mac(vxlan, n->ha);
1404 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1405 /* bridge-local neighbor */
1406 neigh_release(n);
1407 goto out;
1408 }
1409
1410 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1411 n->ha, sha);
1412
1413 neigh_release(n);
1414
1415 if (reply == NULL)
1416 goto out;
1417
1418 skb_reset_mac_header(reply);
1419 __skb_pull(reply, skb_network_offset(reply));
1420 reply->ip_summed = CHECKSUM_UNNECESSARY;
1421 reply->pkt_type = PACKET_HOST;
1422
1423 if (netif_rx_ni(reply) == NET_RX_DROP)
1424 dev->stats.rx_dropped++;
1425 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1426 union vxlan_addr ipa = {
1427 .sin.sin_addr.s_addr = tip,
1428 .sin.sin_family = AF_INET,
1429 };
1430
1431 vxlan_ip_miss(dev, &ipa);
1432 }
1433out:
1434 consume_skb(skb);
1435 return NETDEV_TX_OK;
1436}
1437
1438#if IS_ENABLED(CONFIG_IPV6)
1439static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1440 struct neighbour *n, bool isrouter)
1441{
1442 struct net_device *dev = request->dev;
1443 struct sk_buff *reply;
1444 struct nd_msg *ns, *na;
1445 struct ipv6hdr *pip6;
1446 u8 *daddr;
1447 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1448 int ns_olen;
1449 int i, len;
1450
1451 if (dev == NULL)
1452 return NULL;
1453
1454 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1455 sizeof(*na) + na_olen + dev->needed_tailroom;
1456 reply = alloc_skb(len, GFP_ATOMIC);
1457 if (reply == NULL)
1458 return NULL;
1459
1460 reply->protocol = htons(ETH_P_IPV6);
1461 reply->dev = dev;
1462 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1463 skb_push(reply, sizeof(struct ethhdr));
1464 skb_reset_mac_header(reply);
1465
1466 ns = (struct nd_msg *)skb_transport_header(request);
1467
1468 daddr = eth_hdr(request)->h_source;
1469 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1470 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1471 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1472 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1473 break;
1474 }
1475 }
1476
1477 /* Ethernet header */
1478 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1479 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1480 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1481 reply->protocol = htons(ETH_P_IPV6);
1482
1483 skb_pull(reply, sizeof(struct ethhdr));
1484 skb_reset_network_header(reply);
1485 skb_put(reply, sizeof(struct ipv6hdr));
1486
1487 /* IPv6 header */
1488
1489 pip6 = ipv6_hdr(reply);
1490 memset(pip6, 0, sizeof(struct ipv6hdr));
1491 pip6->version = 6;
1492 pip6->priority = ipv6_hdr(request)->priority;
1493 pip6->nexthdr = IPPROTO_ICMPV6;
1494 pip6->hop_limit = 255;
1495 pip6->daddr = ipv6_hdr(request)->saddr;
1496 pip6->saddr = *(struct in6_addr *)n->primary_key;
1497
1498 skb_pull(reply, sizeof(struct ipv6hdr));
1499 skb_reset_transport_header(reply);
1500
1501 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502
1503 /* Neighbor Advertisement */
1504 memset(na, 0, sizeof(*na)+na_olen);
1505 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1506 na->icmph.icmp6_router = isrouter;
1507 na->icmph.icmp6_override = 1;
1508 na->icmph.icmp6_solicited = 1;
1509 na->target = ns->target;
1510 ether_addr_copy(&na->opt[2], n->ha);
1511 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1512 na->opt[1] = na_olen >> 3;
1513
1514 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1515 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1516 csum_partial(na, sizeof(*na)+na_olen, 0));
1517
1518 pip6->payload_len = htons(sizeof(*na)+na_olen);
1519
1520 skb_push(reply, sizeof(struct ipv6hdr));
1521
1522 reply->ip_summed = CHECKSUM_UNNECESSARY;
1523
1524 return reply;
1525}
1526
1527static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528{
1529 struct vxlan_dev *vxlan = netdev_priv(dev);
1530 struct nd_msg *msg;
1531 const struct ipv6hdr *iphdr;
1532 const struct in6_addr *saddr, *daddr;
1533 struct neighbour *n;
1534 struct inet6_dev *in6_dev;
1535
1536 in6_dev = __in6_dev_get(dev);
1537 if (!in6_dev)
1538 goto out;
1539
1540 iphdr = ipv6_hdr(skb);
1541 saddr = &iphdr->saddr;
1542 daddr = &iphdr->daddr;
1543
1544 msg = (struct nd_msg *)skb_transport_header(skb);
1545 if (msg->icmph.icmp6_code != 0 ||
1546 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1547 goto out;
1548
1549 if (ipv6_addr_loopback(daddr) ||
1550 ipv6_addr_is_multicast(&msg->target))
1551 goto out;
1552
1553 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1554
1555 if (n) {
1556 struct vxlan_fdb *f;
1557 struct sk_buff *reply;
1558
1559 if (!(n->nud_state & NUD_CONNECTED)) {
1560 neigh_release(n);
1561 goto out;
1562 }
1563
1564 f = vxlan_find_mac(vxlan, n->ha);
1565 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1566 /* bridge-local neighbor */
1567 neigh_release(n);
1568 goto out;
1569 }
1570
1571 reply = vxlan_na_create(skb, n,
1572 !!(f ? f->flags & NTF_ROUTER : 0));
1573
1574 neigh_release(n);
1575
1576 if (reply == NULL)
1577 goto out;
1578
1579 if (netif_rx_ni(reply) == NET_RX_DROP)
1580 dev->stats.rx_dropped++;
1581
1582 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1583 union vxlan_addr ipa = {
1584 .sin6.sin6_addr = msg->target,
1585 .sin6.sin6_family = AF_INET6,
1586 };
1587
1588 vxlan_ip_miss(dev, &ipa);
1589 }
1590
1591out:
1592 consume_skb(skb);
1593 return NETDEV_TX_OK;
1594}
1595#endif
1596
1597static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598{
1599 struct vxlan_dev *vxlan = netdev_priv(dev);
1600 struct neighbour *n;
1601
1602 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1603 return false;
1604
1605 n = NULL;
1606 switch (ntohs(eth_hdr(skb)->h_proto)) {
1607 case ETH_P_IP:
1608 {
1609 struct iphdr *pip;
1610
1611 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1612 return false;
1613 pip = ip_hdr(skb);
1614 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1615 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1616 union vxlan_addr ipa = {
1617 .sin.sin_addr.s_addr = pip->daddr,
1618 .sin.sin_family = AF_INET,
1619 };
1620
1621 vxlan_ip_miss(dev, &ipa);
1622 return false;
1623 }
1624
1625 break;
1626 }
1627#if IS_ENABLED(CONFIG_IPV6)
1628 case ETH_P_IPV6:
1629 {
1630 struct ipv6hdr *pip6;
1631
1632 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633 return false;
1634 pip6 = ipv6_hdr(skb);
1635 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1636 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1637 union vxlan_addr ipa = {
1638 .sin6.sin6_addr = pip6->daddr,
1639 .sin6.sin6_family = AF_INET6,
1640 };
1641
1642 vxlan_ip_miss(dev, &ipa);
1643 return false;
1644 }
1645
1646 break;
1647 }
1648#endif
1649 default:
1650 return false;
1651 }
1652
1653 if (n) {
1654 bool diff;
1655
1656 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1657 if (diff) {
1658 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659 dev->addr_len);
1660 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1661 }
1662 neigh_release(n);
1663 return diff;
1664 }
1665
1666 return false;
1667}
1668
1669static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1670 struct vxlan_metadata *md)
1671{
1672 struct vxlanhdr_gbp *gbp;
1673
1674 if (!md->gbp)
1675 return;
1676
1677 gbp = (struct vxlanhdr_gbp *)vxh;
1678 vxh->vx_flags |= VXLAN_HF_GBP;
1679
1680 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681 gbp->dont_learn = 1;
1682
1683 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684 gbp->policy_applied = 1;
1685
1686 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1687}
1688
1689static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1690 int iphdr_len, __be32 vni,
1691 struct vxlan_metadata *md, u32 vxflags,
1692 bool udp_sum)
1693{
1694 struct vxlanhdr *vxh;
1695 int min_headroom;
1696 int err;
1697 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1698
1699 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1700 skb->ip_summed == CHECKSUM_PARTIAL) {
1701 int csum_start = skb_checksum_start_offset(skb);
1702
1703 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1704 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1705 (skb->csum_offset == offsetof(struct udphdr, check) ||
1706 skb->csum_offset == offsetof(struct tcphdr, check)))
1707 type |= SKB_GSO_TUNNEL_REMCSUM;
1708 }
1709
1710 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1711 + VXLAN_HLEN + iphdr_len
1712 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1713
1714 /* Need space for new headers (invalidates iph ptr) */
1715 err = skb_cow_head(skb, min_headroom);
1716 if (unlikely(err)) {
1717 kfree_skb(skb);
1718 return err;
1719 }
1720
1721 skb = vlan_hwaccel_push_inside(skb);
1722 if (WARN_ON(!skb))
1723 return -ENOMEM;
1724
1725 skb = iptunnel_handle_offloads(skb, type);
1726 if (IS_ERR(skb))
1727 return PTR_ERR(skb);
1728
1729 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1730 vxh->vx_flags = VXLAN_HF_VNI;
1731 vxh->vx_vni = vxlan_vni_field(vni);
1732
1733 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1734 unsigned int start;
1735
1736 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1737 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1738 vxh->vx_flags |= VXLAN_HF_RCO;
1739
1740 if (!skb_is_gso(skb)) {
1741 skb->ip_summed = CHECKSUM_NONE;
1742 skb->encapsulation = 0;
1743 }
1744 }
1745
1746 if (vxflags & VXLAN_F_GBP)
1747 vxlan_build_gbp_hdr(vxh, vxflags, md);
1748
1749 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1750 return 0;
1751}
1752
1753static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1754 struct sk_buff *skb, int oif, u8 tos,
1755 __be32 daddr, __be32 *saddr,
1756 struct dst_cache *dst_cache,
1757 const struct ip_tunnel_info *info)
1758{
1759 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1760 struct rtable *rt = NULL;
1761 struct flowi4 fl4;
1762
1763 if (tos && !info)
1764 use_cache = false;
1765 if (use_cache) {
1766 rt = dst_cache_get_ip4(dst_cache, saddr);
1767 if (rt)
1768 return rt;
1769 }
1770
1771 memset(&fl4, 0, sizeof(fl4));
1772 fl4.flowi4_oif = oif;
1773 fl4.flowi4_tos = RT_TOS(tos);
1774 fl4.flowi4_mark = skb->mark;
1775 fl4.flowi4_proto = IPPROTO_UDP;
1776 fl4.daddr = daddr;
1777 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1778
1779 rt = ip_route_output_key(vxlan->net, &fl4);
1780 if (!IS_ERR(rt)) {
1781 *saddr = fl4.saddr;
1782 if (use_cache)
1783 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1784 }
1785 return rt;
1786}
1787
1788#if IS_ENABLED(CONFIG_IPV6)
1789static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1790 struct sk_buff *skb, int oif, u8 tos,
1791 __be32 label,
1792 const struct in6_addr *daddr,
1793 struct in6_addr *saddr,
1794 struct dst_cache *dst_cache,
1795 const struct ip_tunnel_info *info)
1796{
1797 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1798 struct dst_entry *ndst;
1799 struct flowi6 fl6;
1800 int err;
1801
1802 if (tos && !info)
1803 use_cache = false;
1804 if (use_cache) {
1805 ndst = dst_cache_get_ip6(dst_cache, saddr);
1806 if (ndst)
1807 return ndst;
1808 }
1809
1810 memset(&fl6, 0, sizeof(fl6));
1811 fl6.flowi6_oif = oif;
1812 fl6.daddr = *daddr;
1813 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1814 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1815 fl6.flowi6_mark = skb->mark;
1816 fl6.flowi6_proto = IPPROTO_UDP;
1817
1818 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1819 vxlan->vn6_sock->sock->sk,
1820 &ndst, &fl6);
1821 if (err < 0)
1822 return ERR_PTR(err);
1823
1824 *saddr = fl6.saddr;
1825 if (use_cache)
1826 dst_cache_set_ip6(dst_cache, ndst, saddr);
1827 return ndst;
1828}
1829#endif
1830
1831/* Bypass encapsulation if the destination is local */
1832static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1833 struct vxlan_dev *dst_vxlan)
1834{
1835 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1836 union vxlan_addr loopback;
1837 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1838 struct net_device *dev = skb->dev;
1839 int len = skb->len;
1840
1841 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1842 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1843 skb->pkt_type = PACKET_HOST;
1844 skb->encapsulation = 0;
1845 skb->dev = dst_vxlan->dev;
1846 __skb_pull(skb, skb_network_offset(skb));
1847
1848 if (remote_ip->sa.sa_family == AF_INET) {
1849 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1850 loopback.sa.sa_family = AF_INET;
1851#if IS_ENABLED(CONFIG_IPV6)
1852 } else {
1853 loopback.sin6.sin6_addr = in6addr_loopback;
1854 loopback.sa.sa_family = AF_INET6;
1855#endif
1856 }
1857
1858 if (dst_vxlan->flags & VXLAN_F_LEARN)
1859 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1860
1861 u64_stats_update_begin(&tx_stats->syncp);
1862 tx_stats->tx_packets++;
1863 tx_stats->tx_bytes += len;
1864 u64_stats_update_end(&tx_stats->syncp);
1865
1866 if (netif_rx(skb) == NET_RX_SUCCESS) {
1867 u64_stats_update_begin(&rx_stats->syncp);
1868 rx_stats->rx_packets++;
1869 rx_stats->rx_bytes += len;
1870 u64_stats_update_end(&rx_stats->syncp);
1871 } else {
1872 dev->stats.rx_dropped++;
1873 }
1874}
1875
1876static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1877 struct vxlan_rdst *rdst, bool did_rsc)
1878{
1879 struct dst_cache *dst_cache;
1880 struct ip_tunnel_info *info;
1881 struct vxlan_dev *vxlan = netdev_priv(dev);
1882 struct sock *sk;
1883 struct rtable *rt = NULL;
1884 const struct iphdr *old_iph;
1885 union vxlan_addr *dst;
1886 union vxlan_addr remote_ip;
1887 struct vxlan_metadata _md;
1888 struct vxlan_metadata *md = &_md;
1889 __be16 src_port = 0, dst_port;
1890 __be32 vni, label;
1891 __be16 df = 0;
1892 __u8 tos, ttl;
1893 int err;
1894 u32 flags = vxlan->flags;
1895 bool udp_sum = false;
1896 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1897
1898 info = skb_tunnel_info(skb);
1899
1900 if (rdst) {
1901 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1902 vni = rdst->remote_vni;
1903 dst = &rdst->remote_ip;
1904 dst_cache = &rdst->dst_cache;
1905 } else {
1906 if (!info) {
1907 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1908 dev->name);
1909 goto drop;
1910 }
1911 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1912 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1913 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1914 if (remote_ip.sa.sa_family == AF_INET)
1915 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1916 else
1917 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1918 dst = &remote_ip;
1919 dst_cache = &info->dst_cache;
1920 }
1921
1922 if (vxlan_addr_any(dst)) {
1923 if (did_rsc) {
1924 /* short-circuited back to local bridge */
1925 vxlan_encap_bypass(skb, vxlan, vxlan);
1926 return;
1927 }
1928 goto drop;
1929 }
1930
1931 old_iph = ip_hdr(skb);
1932
1933 ttl = vxlan->cfg.ttl;
1934 if (!ttl && vxlan_addr_multicast(dst))
1935 ttl = 1;
1936
1937 tos = vxlan->cfg.tos;
1938 if (tos == 1)
1939 tos = ip_tunnel_get_dsfield(old_iph, skb);
1940
1941 label = vxlan->cfg.label;
1942 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1943 vxlan->cfg.port_max, true);
1944
1945 if (info) {
1946 ttl = info->key.ttl;
1947 tos = info->key.tos;
1948 label = info->key.label;
1949 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1950
1951 if (info->options_len)
1952 md = ip_tunnel_info_opts(info);
1953 } else {
1954 md->gbp = skb->mark;
1955 }
1956
1957 if (dst->sa.sa_family == AF_INET) {
1958 __be32 saddr;
1959
1960 if (!vxlan->vn4_sock)
1961 goto drop;
1962 sk = vxlan->vn4_sock->sock->sk;
1963
1964 rt = vxlan_get_route(vxlan, skb,
1965 rdst ? rdst->remote_ifindex : 0, tos,
1966 dst->sin.sin_addr.s_addr, &saddr,
1967 dst_cache, info);
1968 if (IS_ERR(rt)) {
1969 netdev_dbg(dev, "no route to %pI4\n",
1970 &dst->sin.sin_addr.s_addr);
1971 dev->stats.tx_carrier_errors++;
1972 goto tx_error;
1973 }
1974
1975 if (rt->dst.dev == dev) {
1976 netdev_dbg(dev, "circular route to %pI4\n",
1977 &dst->sin.sin_addr.s_addr);
1978 dev->stats.collisions++;
1979 goto rt_tx_error;
1980 }
1981
1982 /* Bypass encapsulation if the destination is local */
1983 if (rt->rt_flags & RTCF_LOCAL &&
1984 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1985 struct vxlan_dev *dst_vxlan;
1986
1987 ip_rt_put(rt);
1988 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1989 dst->sa.sa_family, dst_port,
1990 vxlan->flags);
1991 if (!dst_vxlan)
1992 goto tx_error;
1993 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1994 return;
1995 }
1996
1997 if (!info)
1998 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
1999 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2000 df = htons(IP_DF);
2001
2002 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2003 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2004 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2005 vni, md, flags, udp_sum);
2006 if (err < 0)
2007 goto xmit_tx_error;
2008
2009 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2010 dst->sin.sin_addr.s_addr, tos, ttl, df,
2011 src_port, dst_port, xnet, !udp_sum);
2012#if IS_ENABLED(CONFIG_IPV6)
2013 } else {
2014 struct dst_entry *ndst;
2015 struct in6_addr saddr;
2016 u32 rt6i_flags;
2017
2018 if (!vxlan->vn6_sock)
2019 goto drop;
2020 sk = vxlan->vn6_sock->sock->sk;
2021
2022 ndst = vxlan6_get_route(vxlan, skb,
2023 rdst ? rdst->remote_ifindex : 0, tos,
2024 label, &dst->sin6.sin6_addr, &saddr,
2025 dst_cache, info);
2026 if (IS_ERR(ndst)) {
2027 netdev_dbg(dev, "no route to %pI6\n",
2028 &dst->sin6.sin6_addr);
2029 dev->stats.tx_carrier_errors++;
2030 goto tx_error;
2031 }
2032
2033 if (ndst->dev == dev) {
2034 netdev_dbg(dev, "circular route to %pI6\n",
2035 &dst->sin6.sin6_addr);
2036 dst_release(ndst);
2037 dev->stats.collisions++;
2038 goto tx_error;
2039 }
2040
2041 /* Bypass encapsulation if the destination is local */
2042 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2043 if (rt6i_flags & RTF_LOCAL &&
2044 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2045 struct vxlan_dev *dst_vxlan;
2046
2047 dst_release(ndst);
2048 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2049 dst->sa.sa_family, dst_port,
2050 vxlan->flags);
2051 if (!dst_vxlan)
2052 goto tx_error;
2053 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2054 return;
2055 }
2056
2057 if (!info)
2058 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2059
2060 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2061 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2062 skb_scrub_packet(skb, xnet);
2063 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2064 vni, md, flags, udp_sum);
2065 if (err < 0) {
2066 dst_release(ndst);
2067 return;
2068 }
2069 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2070 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2071 label, src_port, dst_port, !udp_sum);
2072#endif
2073 }
2074
2075 return;
2076
2077drop:
2078 dev->stats.tx_dropped++;
2079 goto tx_free;
2080
2081xmit_tx_error:
2082 /* skb is already freed. */
2083 skb = NULL;
2084rt_tx_error:
2085 ip_rt_put(rt);
2086tx_error:
2087 dev->stats.tx_errors++;
2088tx_free:
2089 dev_kfree_skb(skb);
2090}
2091
2092/* Transmit local packets over Vxlan
2093 *
2094 * Outer IP header inherits ECN and DF from inner header.
2095 * Outer UDP destination is the VXLAN assigned port.
2096 * source port is based on hash of flow
2097 */
2098static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2099{
2100 struct vxlan_dev *vxlan = netdev_priv(dev);
2101 const struct ip_tunnel_info *info;
2102 struct ethhdr *eth;
2103 bool did_rsc = false;
2104 struct vxlan_rdst *rdst, *fdst = NULL;
2105 struct vxlan_fdb *f;
2106
2107 info = skb_tunnel_info(skb);
2108
2109 skb_reset_mac_header(skb);
2110 eth = eth_hdr(skb);
2111
2112 if ((vxlan->flags & VXLAN_F_PROXY)) {
2113 if (ntohs(eth->h_proto) == ETH_P_ARP)
2114 return arp_reduce(dev, skb);
2115#if IS_ENABLED(CONFIG_IPV6)
2116 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2117 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2118 + sizeof(struct nd_msg)) &&
2119 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2120 struct nd_msg *msg;
2121
2122 msg = (struct nd_msg *)skb_transport_header(skb);
2123 if (msg->icmph.icmp6_code == 0 &&
2124 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2125 return neigh_reduce(dev, skb);
2126 }
2127 eth = eth_hdr(skb);
2128#endif
2129 }
2130
2131 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2132 if (info && info->mode & IP_TUNNEL_INFO_TX)
2133 vxlan_xmit_one(skb, dev, NULL, false);
2134 else
2135 kfree_skb(skb);
2136 return NETDEV_TX_OK;
2137 }
2138
2139 f = vxlan_find_mac(vxlan, eth->h_dest);
2140 did_rsc = false;
2141
2142 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2143 (ntohs(eth->h_proto) == ETH_P_IP ||
2144 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2145 did_rsc = route_shortcircuit(dev, skb);
2146 if (did_rsc)
2147 f = vxlan_find_mac(vxlan, eth->h_dest);
2148 }
2149
2150 if (f == NULL) {
2151 f = vxlan_find_mac(vxlan, all_zeros_mac);
2152 if (f == NULL) {
2153 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2154 !is_multicast_ether_addr(eth->h_dest))
2155 vxlan_fdb_miss(vxlan, eth->h_dest);
2156
2157 dev->stats.tx_dropped++;
2158 kfree_skb(skb);
2159 return NETDEV_TX_OK;
2160 }
2161 }
2162
2163 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2164 struct sk_buff *skb1;
2165
2166 if (!fdst) {
2167 fdst = rdst;
2168 continue;
2169 }
2170 skb1 = skb_clone(skb, GFP_ATOMIC);
2171 if (skb1)
2172 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2173 }
2174
2175 if (fdst)
2176 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2177 else
2178 kfree_skb(skb);
2179 return NETDEV_TX_OK;
2180}
2181
2182/* Walk the forwarding table and purge stale entries */
2183static void vxlan_cleanup(unsigned long arg)
2184{
2185 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2186 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2187 unsigned int h;
2188
2189 if (!netif_running(vxlan->dev))
2190 return;
2191
2192 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2193 struct hlist_node *p, *n;
2194
2195 spin_lock_bh(&vxlan->hash_lock);
2196 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2197 struct vxlan_fdb *f
2198 = container_of(p, struct vxlan_fdb, hlist);
2199 unsigned long timeout;
2200
2201 if (f->state & NUD_PERMANENT)
2202 continue;
2203
2204 timeout = f->used + vxlan->cfg.age_interval * HZ;
2205 if (time_before_eq(timeout, jiffies)) {
2206 netdev_dbg(vxlan->dev,
2207 "garbage collect %pM\n",
2208 f->eth_addr);
2209 f->state = NUD_STALE;
2210 vxlan_fdb_destroy(vxlan, f);
2211 } else if (time_before(timeout, next_timer))
2212 next_timer = timeout;
2213 }
2214 spin_unlock_bh(&vxlan->hash_lock);
2215 }
2216
2217 mod_timer(&vxlan->age_timer, next_timer);
2218}
2219
2220static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2221{
2222 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2223 __be32 vni = vxlan->default_dst.remote_vni;
2224
2225 spin_lock(&vn->sock_lock);
2226 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2227 spin_unlock(&vn->sock_lock);
2228}
2229
2230/* Setup stats when device is created */
2231static int vxlan_init(struct net_device *dev)
2232{
2233 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2234 if (!dev->tstats)
2235 return -ENOMEM;
2236
2237 return 0;
2238}
2239
2240static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2241{
2242 struct vxlan_fdb *f;
2243
2244 spin_lock_bh(&vxlan->hash_lock);
2245 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2246 if (f)
2247 vxlan_fdb_destroy(vxlan, f);
2248 spin_unlock_bh(&vxlan->hash_lock);
2249}
2250
2251static void vxlan_uninit(struct net_device *dev)
2252{
2253 struct vxlan_dev *vxlan = netdev_priv(dev);
2254
2255 vxlan_fdb_delete_default(vxlan);
2256
2257 free_percpu(dev->tstats);
2258}
2259
2260/* Start ageing timer and join group when device is brought up */
2261static int vxlan_open(struct net_device *dev)
2262{
2263 struct vxlan_dev *vxlan = netdev_priv(dev);
2264 int ret;
2265
2266 ret = vxlan_sock_add(vxlan);
2267 if (ret < 0)
2268 return ret;
2269
2270 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2271 ret = vxlan_igmp_join(vxlan);
2272 if (ret == -EADDRINUSE)
2273 ret = 0;
2274 if (ret) {
2275 vxlan_sock_release(vxlan);
2276 return ret;
2277 }
2278 }
2279
2280 if (vxlan->cfg.age_interval)
2281 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2282
2283 return ret;
2284}
2285
2286/* Purge the forwarding table */
2287static void vxlan_flush(struct vxlan_dev *vxlan)
2288{
2289 unsigned int h;
2290
2291 spin_lock_bh(&vxlan->hash_lock);
2292 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2293 struct hlist_node *p, *n;
2294 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2295 struct vxlan_fdb *f
2296 = container_of(p, struct vxlan_fdb, hlist);
2297 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2298 if (!is_zero_ether_addr(f->eth_addr))
2299 vxlan_fdb_destroy(vxlan, f);
2300 }
2301 }
2302 spin_unlock_bh(&vxlan->hash_lock);
2303}
2304
2305/* Cleanup timer and forwarding table on shutdown */
2306static int vxlan_stop(struct net_device *dev)
2307{
2308 struct vxlan_dev *vxlan = netdev_priv(dev);
2309 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2310 int ret = 0;
2311
2312 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2313 !vxlan_group_used(vn, vxlan))
2314 ret = vxlan_igmp_leave(vxlan);
2315
2316 del_timer_sync(&vxlan->age_timer);
2317
2318 vxlan_flush(vxlan);
2319 vxlan_sock_release(vxlan);
2320
2321 return ret;
2322}
2323
2324/* Stub, nothing needs to be done. */
2325static void vxlan_set_multicast_list(struct net_device *dev)
2326{
2327}
2328
2329static int __vxlan_change_mtu(struct net_device *dev,
2330 struct net_device *lowerdev,
2331 struct vxlan_rdst *dst, int new_mtu, bool strict)
2332{
2333 int max_mtu = IP_MAX_MTU;
2334
2335 if (lowerdev)
2336 max_mtu = lowerdev->mtu;
2337
2338 if (dst->remote_ip.sa.sa_family == AF_INET6)
2339 max_mtu -= VXLAN6_HEADROOM;
2340 else
2341 max_mtu -= VXLAN_HEADROOM;
2342
2343 if (new_mtu < 68)
2344 return -EINVAL;
2345
2346 if (new_mtu > max_mtu) {
2347 if (strict)
2348 return -EINVAL;
2349
2350 new_mtu = max_mtu;
2351 }
2352
2353 dev->mtu = new_mtu;
2354 return 0;
2355}
2356
2357static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2358{
2359 struct vxlan_dev *vxlan = netdev_priv(dev);
2360 struct vxlan_rdst *dst = &vxlan->default_dst;
2361 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2362 dst->remote_ifindex);
2363 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2364}
2365
2366static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2367{
2368 struct vxlan_dev *vxlan = netdev_priv(dev);
2369 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2370 __be16 sport, dport;
2371
2372 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2373 vxlan->cfg.port_max, true);
2374 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2375
2376 if (ip_tunnel_info_af(info) == AF_INET) {
2377 struct rtable *rt;
2378
2379 if (!vxlan->vn4_sock)
2380 return -EINVAL;
2381 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2382 info->key.u.ipv4.dst,
2383 &info->key.u.ipv4.src, NULL, info);
2384 if (IS_ERR(rt))
2385 return PTR_ERR(rt);
2386 ip_rt_put(rt);
2387 } else {
2388#if IS_ENABLED(CONFIG_IPV6)
2389 struct dst_entry *ndst;
2390
2391 if (!vxlan->vn6_sock)
2392 return -EINVAL;
2393 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2394 info->key.label, &info->key.u.ipv6.dst,
2395 &info->key.u.ipv6.src, NULL, info);
2396 if (IS_ERR(ndst))
2397 return PTR_ERR(ndst);
2398 dst_release(ndst);
2399#else /* !CONFIG_IPV6 */
2400 return -EPFNOSUPPORT;
2401#endif
2402 }
2403 info->key.tp_src = sport;
2404 info->key.tp_dst = dport;
2405 return 0;
2406}
2407
2408static const struct net_device_ops vxlan_netdev_ops = {
2409 .ndo_init = vxlan_init,
2410 .ndo_uninit = vxlan_uninit,
2411 .ndo_open = vxlan_open,
2412 .ndo_stop = vxlan_stop,
2413 .ndo_start_xmit = vxlan_xmit,
2414 .ndo_get_stats64 = ip_tunnel_get_stats64,
2415 .ndo_set_rx_mode = vxlan_set_multicast_list,
2416 .ndo_change_mtu = vxlan_change_mtu,
2417 .ndo_validate_addr = eth_validate_addr,
2418 .ndo_set_mac_address = eth_mac_addr,
2419 .ndo_fdb_add = vxlan_fdb_add,
2420 .ndo_fdb_del = vxlan_fdb_delete,
2421 .ndo_fdb_dump = vxlan_fdb_dump,
2422 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2423};
2424
2425/* Info for udev, that this is a virtual tunnel endpoint */
2426static struct device_type vxlan_type = {
2427 .name = "vxlan",
2428};
2429
2430/* Calls the ndo_add_vxlan_port of the caller in order to
2431 * supply the listening VXLAN udp ports. Callers are expected
2432 * to implement the ndo_add_vxlan_port.
2433 */
2434void vxlan_get_rx_port(struct net_device *dev)
2435{
2436 struct vxlan_sock *vs;
2437 struct net *net = dev_net(dev);
2438 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2439 sa_family_t sa_family;
2440 __be16 port;
2441 unsigned int i;
2442
2443 spin_lock(&vn->sock_lock);
2444 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2445 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2446 port = inet_sk(vs->sock->sk)->inet_sport;
2447 sa_family = vxlan_get_sk_family(vs);
2448 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2449 port);
2450 }
2451 }
2452 spin_unlock(&vn->sock_lock);
2453}
2454EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2455
2456/* Initialize the device structure. */
2457static void vxlan_setup(struct net_device *dev)
2458{
2459 struct vxlan_dev *vxlan = netdev_priv(dev);
2460 unsigned int h;
2461
2462 eth_hw_addr_random(dev);
2463 ether_setup(dev);
2464
2465 dev->netdev_ops = &vxlan_netdev_ops;
2466 dev->destructor = free_netdev;
2467 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2468
2469 dev->features |= NETIF_F_LLTX;
2470 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2471 dev->features |= NETIF_F_RXCSUM;
2472 dev->features |= NETIF_F_GSO_SOFTWARE;
2473
2474 dev->vlan_features = dev->features;
2475 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2476 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2477 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2478 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2479 netif_keep_dst(dev);
2480 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2481 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2482
2483 INIT_LIST_HEAD(&vxlan->next);
2484 spin_lock_init(&vxlan->hash_lock);
2485
2486 init_timer_deferrable(&vxlan->age_timer);
2487 vxlan->age_timer.function = vxlan_cleanup;
2488 vxlan->age_timer.data = (unsigned long) vxlan;
2489
2490 vxlan->cfg.dst_port = htons(vxlan_port);
2491
2492 vxlan->dev = dev;
2493
2494 gro_cells_init(&vxlan->gro_cells, dev);
2495
2496 for (h = 0; h < FDB_HASH_SIZE; ++h)
2497 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2498}
2499
2500static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2501 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2502 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2503 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2504 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2505 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2506 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2507 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2508 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2509 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2510 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2511 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2512 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2513 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2514 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2515 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2516 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2517 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2518 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2519 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2520 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2521 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2522 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2523 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2524 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2525 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2526 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2527};
2528
2529static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2530{
2531 if (tb[IFLA_ADDRESS]) {
2532 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2533 pr_debug("invalid link address (not ethernet)\n");
2534 return -EINVAL;
2535 }
2536
2537 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2538 pr_debug("invalid all zero ethernet address\n");
2539 return -EADDRNOTAVAIL;
2540 }
2541 }
2542
2543 if (!data)
2544 return -EINVAL;
2545
2546 if (data[IFLA_VXLAN_ID]) {
2547 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2548 if (id >= VXLAN_VID_MASK)
2549 return -ERANGE;
2550 }
2551
2552 if (data[IFLA_VXLAN_PORT_RANGE]) {
2553 const struct ifla_vxlan_port_range *p
2554 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2555
2556 if (ntohs(p->high) < ntohs(p->low)) {
2557 pr_debug("port range %u .. %u not valid\n",
2558 ntohs(p->low), ntohs(p->high));
2559 return -EINVAL;
2560 }
2561 }
2562
2563 return 0;
2564}
2565
2566static void vxlan_get_drvinfo(struct net_device *netdev,
2567 struct ethtool_drvinfo *drvinfo)
2568{
2569 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2570 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2571}
2572
2573static const struct ethtool_ops vxlan_ethtool_ops = {
2574 .get_drvinfo = vxlan_get_drvinfo,
2575 .get_link = ethtool_op_get_link,
2576};
2577
2578static void vxlan_del_work(struct work_struct *work)
2579{
2580 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2581 udp_tunnel_sock_release(vs->sock);
2582 kfree_rcu(vs, rcu);
2583}
2584
2585static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2586 __be16 port, u32 flags)
2587{
2588 struct socket *sock;
2589 struct udp_port_cfg udp_conf;
2590 int err;
2591
2592 memset(&udp_conf, 0, sizeof(udp_conf));
2593
2594 if (ipv6) {
2595 udp_conf.family = AF_INET6;
2596 udp_conf.use_udp6_rx_checksums =
2597 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2598 udp_conf.ipv6_v6only = 1;
2599 } else {
2600 udp_conf.family = AF_INET;
2601 }
2602
2603 udp_conf.local_udp_port = port;
2604
2605 /* Open UDP socket */
2606 err = udp_sock_create(net, &udp_conf, &sock);
2607 if (err < 0)
2608 return ERR_PTR(err);
2609
2610 return sock;
2611}
2612
2613/* Create new listen socket if needed */
2614static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2615 __be16 port, u32 flags)
2616{
2617 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2618 struct vxlan_sock *vs;
2619 struct socket *sock;
2620 unsigned int h;
2621 struct udp_tunnel_sock_cfg tunnel_cfg;
2622
2623 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2624 if (!vs)
2625 return ERR_PTR(-ENOMEM);
2626
2627 for (h = 0; h < VNI_HASH_SIZE; ++h)
2628 INIT_HLIST_HEAD(&vs->vni_list[h]);
2629
2630 INIT_WORK(&vs->del_work, vxlan_del_work);
2631
2632 sock = vxlan_create_sock(net, ipv6, port, flags);
2633 if (IS_ERR(sock)) {
2634 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2635 PTR_ERR(sock));
2636 kfree(vs);
2637 return ERR_CAST(sock);
2638 }
2639
2640 vs->sock = sock;
2641 atomic_set(&vs->refcnt, 1);
2642 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2643
2644 /* Initialize the vxlan udp offloads structure */
2645 vs->udp_offloads.port = port;
2646 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2647 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2648
2649 spin_lock(&vn->sock_lock);
2650 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2651 vxlan_notify_add_rx_port(vs);
2652 spin_unlock(&vn->sock_lock);
2653
2654 /* Mark socket as an encapsulation socket. */
2655 tunnel_cfg.sk_user_data = vs;
2656 tunnel_cfg.encap_type = 1;
2657 tunnel_cfg.encap_rcv = vxlan_rcv;
2658 tunnel_cfg.encap_destroy = NULL;
2659
2660 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2661
2662 return vs;
2663}
2664
2665static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2666{
2667 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2668 struct vxlan_sock *vs = NULL;
2669
2670 if (!vxlan->cfg.no_share) {
2671 spin_lock(&vn->sock_lock);
2672 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2673 vxlan->cfg.dst_port, vxlan->flags);
2674 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2675 spin_unlock(&vn->sock_lock);
2676 return -EBUSY;
2677 }
2678 spin_unlock(&vn->sock_lock);
2679 }
2680 if (!vs)
2681 vs = vxlan_socket_create(vxlan->net, ipv6,
2682 vxlan->cfg.dst_port, vxlan->flags);
2683 if (IS_ERR(vs))
2684 return PTR_ERR(vs);
2685#if IS_ENABLED(CONFIG_IPV6)
2686 if (ipv6)
2687 vxlan->vn6_sock = vs;
2688 else
2689#endif
2690 vxlan->vn4_sock = vs;
2691 vxlan_vs_add_dev(vs, vxlan);
2692 return 0;
2693}
2694
2695static int vxlan_sock_add(struct vxlan_dev *vxlan)
2696{
2697 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2698 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2699 int ret = 0;
2700
2701 vxlan->vn4_sock = NULL;
2702#if IS_ENABLED(CONFIG_IPV6)
2703 vxlan->vn6_sock = NULL;
2704 if (ipv6 || metadata)
2705 ret = __vxlan_sock_add(vxlan, true);
2706#endif
2707 if (!ret && (!ipv6 || metadata))
2708 ret = __vxlan_sock_add(vxlan, false);
2709 if (ret < 0)
2710 vxlan_sock_release(vxlan);
2711 return ret;
2712}
2713
2714static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2715 struct vxlan_config *conf)
2716{
2717 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2718 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2719 struct vxlan_rdst *dst = &vxlan->default_dst;
2720 unsigned short needed_headroom = ETH_HLEN;
2721 int err;
2722 bool use_ipv6 = false;
2723 __be16 default_port = vxlan->cfg.dst_port;
2724 struct net_device *lowerdev = NULL;
2725
2726 vxlan->net = src_net;
2727
2728 dst->remote_vni = conf->vni;
2729
2730 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2731
2732 /* Unless IPv6 is explicitly requested, assume IPv4 */
2733 if (!dst->remote_ip.sa.sa_family)
2734 dst->remote_ip.sa.sa_family = AF_INET;
2735
2736 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2737 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2738 if (!IS_ENABLED(CONFIG_IPV6))
2739 return -EPFNOSUPPORT;
2740 use_ipv6 = true;
2741 vxlan->flags |= VXLAN_F_IPV6;
2742 }
2743
2744 if (conf->label && !use_ipv6) {
2745 pr_info("label only supported in use with IPv6\n");
2746 return -EINVAL;
2747 }
2748
2749 if (conf->remote_ifindex) {
2750 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2751 dst->remote_ifindex = conf->remote_ifindex;
2752
2753 if (!lowerdev) {
2754 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2755 return -ENODEV;
2756 }
2757
2758#if IS_ENABLED(CONFIG_IPV6)
2759 if (use_ipv6) {
2760 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2761 if (idev && idev->cnf.disable_ipv6) {
2762 pr_info("IPv6 is disabled via sysctl\n");
2763 return -EPERM;
2764 }
2765 }
2766#endif
2767
2768 if (!conf->mtu)
2769 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2770
2771 needed_headroom = lowerdev->hard_header_len;
2772 }
2773
2774 if (conf->mtu) {
2775 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2776 if (err)
2777 return err;
2778 }
2779
2780 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2781 needed_headroom += VXLAN6_HEADROOM;
2782 else
2783 needed_headroom += VXLAN_HEADROOM;
2784 dev->needed_headroom = needed_headroom;
2785
2786 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2787 if (!vxlan->cfg.dst_port)
2788 vxlan->cfg.dst_port = default_port;
2789 vxlan->flags |= conf->flags;
2790
2791 if (!vxlan->cfg.age_interval)
2792 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2793
2794 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2795 if (tmp->cfg.vni == conf->vni &&
2796 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2797 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2798 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2799 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2800 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2801 return -EEXIST;
2802 }
2803
2804 dev->ethtool_ops = &vxlan_ethtool_ops;
2805
2806 /* create an fdb entry for a valid default destination */
2807 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2808 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2809 &vxlan->default_dst.remote_ip,
2810 NUD_REACHABLE|NUD_PERMANENT,
2811 NLM_F_EXCL|NLM_F_CREATE,
2812 vxlan->cfg.dst_port,
2813 vxlan->default_dst.remote_vni,
2814 vxlan->default_dst.remote_ifindex,
2815 NTF_SELF);
2816 if (err)
2817 return err;
2818 }
2819
2820 err = register_netdevice(dev);
2821 if (err) {
2822 vxlan_fdb_delete_default(vxlan);
2823 return err;
2824 }
2825
2826 list_add(&vxlan->next, &vn->vxlan_list);
2827
2828 return 0;
2829}
2830
2831struct net_device *vxlan_dev_create(struct net *net, const char *name,
2832 u8 name_assign_type, struct vxlan_config *conf)
2833{
2834 struct nlattr *tb[IFLA_MAX+1];
2835 struct net_device *dev;
2836 int err;
2837
2838 memset(&tb, 0, sizeof(tb));
2839
2840 dev = rtnl_create_link(net, name, name_assign_type,
2841 &vxlan_link_ops, tb);
2842 if (IS_ERR(dev))
2843 return dev;
2844
2845 err = vxlan_dev_configure(net, dev, conf);
2846 if (err < 0) {
2847 free_netdev(dev);
2848 return ERR_PTR(err);
2849 }
2850
2851 return dev;
2852}
2853EXPORT_SYMBOL_GPL(vxlan_dev_create);
2854
2855static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2856 struct nlattr *tb[], struct nlattr *data[])
2857{
2858 struct vxlan_config conf;
2859 int err;
2860
2861 memset(&conf, 0, sizeof(conf));
2862
2863 if (data[IFLA_VXLAN_ID])
2864 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2865
2866 if (data[IFLA_VXLAN_GROUP]) {
2867 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2868 } else if (data[IFLA_VXLAN_GROUP6]) {
2869 if (!IS_ENABLED(CONFIG_IPV6))
2870 return -EPFNOSUPPORT;
2871
2872 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2873 conf.remote_ip.sa.sa_family = AF_INET6;
2874 }
2875
2876 if (data[IFLA_VXLAN_LOCAL]) {
2877 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2878 conf.saddr.sa.sa_family = AF_INET;
2879 } else if (data[IFLA_VXLAN_LOCAL6]) {
2880 if (!IS_ENABLED(CONFIG_IPV6))
2881 return -EPFNOSUPPORT;
2882
2883 /* TODO: respect scope id */
2884 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2885 conf.saddr.sa.sa_family = AF_INET6;
2886 }
2887
2888 if (data[IFLA_VXLAN_LINK])
2889 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2890
2891 if (data[IFLA_VXLAN_TOS])
2892 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2893
2894 if (data[IFLA_VXLAN_TTL])
2895 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2896
2897 if (data[IFLA_VXLAN_LABEL])
2898 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2899 IPV6_FLOWLABEL_MASK;
2900
2901 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2902 conf.flags |= VXLAN_F_LEARN;
2903
2904 if (data[IFLA_VXLAN_AGEING])
2905 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2906
2907 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2908 conf.flags |= VXLAN_F_PROXY;
2909
2910 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2911 conf.flags |= VXLAN_F_RSC;
2912
2913 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2914 conf.flags |= VXLAN_F_L2MISS;
2915
2916 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2917 conf.flags |= VXLAN_F_L3MISS;
2918
2919 if (data[IFLA_VXLAN_LIMIT])
2920 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2921
2922 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2923 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2924 conf.flags |= VXLAN_F_COLLECT_METADATA;
2925
2926 if (data[IFLA_VXLAN_PORT_RANGE]) {
2927 const struct ifla_vxlan_port_range *p
2928 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2929 conf.port_min = ntohs(p->low);
2930 conf.port_max = ntohs(p->high);
2931 }
2932
2933 if (data[IFLA_VXLAN_PORT])
2934 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2935
2936 if (data[IFLA_VXLAN_UDP_CSUM] &&
2937 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2938 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2939
2940 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2941 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2942 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2943
2944 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2945 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2946 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2947
2948 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2949 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2950 conf.flags |= VXLAN_F_REMCSUM_TX;
2951
2952 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2953 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2954 conf.flags |= VXLAN_F_REMCSUM_RX;
2955
2956 if (data[IFLA_VXLAN_GBP])
2957 conf.flags |= VXLAN_F_GBP;
2958
2959 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2960 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2961
2962 err = vxlan_dev_configure(src_net, dev, &conf);
2963 switch (err) {
2964 case -ENODEV:
2965 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2966 break;
2967
2968 case -EPERM:
2969 pr_info("IPv6 is disabled via sysctl\n");
2970 break;
2971
2972 case -EEXIST:
2973 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
2974 break;
2975 }
2976
2977 return err;
2978}
2979
2980static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2981{
2982 struct vxlan_dev *vxlan = netdev_priv(dev);
2983 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2984
2985 spin_lock(&vn->sock_lock);
2986 if (!hlist_unhashed(&vxlan->hlist))
2987 hlist_del_rcu(&vxlan->hlist);
2988 spin_unlock(&vn->sock_lock);
2989
2990 gro_cells_destroy(&vxlan->gro_cells);
2991 list_del(&vxlan->next);
2992 unregister_netdevice_queue(dev, head);
2993}
2994
2995static size_t vxlan_get_size(const struct net_device *dev)
2996{
2997
2998 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2999 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3000 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3001 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3002 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3003 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3004 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3005 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3006 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3007 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3008 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3009 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3010 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3011 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3012 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3013 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3014 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3015 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3016 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3017 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3018 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3019 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3020 0;
3021}
3022
3023static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3024{
3025 const struct vxlan_dev *vxlan = netdev_priv(dev);
3026 const struct vxlan_rdst *dst = &vxlan->default_dst;
3027 struct ifla_vxlan_port_range ports = {
3028 .low = htons(vxlan->cfg.port_min),
3029 .high = htons(vxlan->cfg.port_max),
3030 };
3031
3032 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3033 goto nla_put_failure;
3034
3035 if (!vxlan_addr_any(&dst->remote_ip)) {
3036 if (dst->remote_ip.sa.sa_family == AF_INET) {
3037 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3038 dst->remote_ip.sin.sin_addr.s_addr))
3039 goto nla_put_failure;
3040#if IS_ENABLED(CONFIG_IPV6)
3041 } else {
3042 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3043 &dst->remote_ip.sin6.sin6_addr))
3044 goto nla_put_failure;
3045#endif
3046 }
3047 }
3048
3049 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3050 goto nla_put_failure;
3051
3052 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3053 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3054 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3055 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3056 goto nla_put_failure;
3057#if IS_ENABLED(CONFIG_IPV6)
3058 } else {
3059 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3060 &vxlan->cfg.saddr.sin6.sin6_addr))
3061 goto nla_put_failure;
3062#endif
3063 }
3064 }
3065
3066 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3067 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3068 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3069 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3070 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3071 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3072 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3073 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3074 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3075 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3076 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3077 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3078 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3079 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3080 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3081 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3082 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3083 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3084 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3085 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3086 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3087 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3088 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3089 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3090 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3091 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3092 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3093 goto nla_put_failure;
3094
3095 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3096 goto nla_put_failure;
3097
3098 if (vxlan->flags & VXLAN_F_GBP &&
3099 nla_put_flag(skb, IFLA_VXLAN_GBP))
3100 goto nla_put_failure;
3101
3102 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3103 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3104 goto nla_put_failure;
3105
3106 return 0;
3107
3108nla_put_failure:
3109 return -EMSGSIZE;
3110}
3111
3112static struct net *vxlan_get_link_net(const struct net_device *dev)
3113{
3114 struct vxlan_dev *vxlan = netdev_priv(dev);
3115
3116 return vxlan->net;
3117}
3118
3119static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3120 .kind = "vxlan",
3121 .maxtype = IFLA_VXLAN_MAX,
3122 .policy = vxlan_policy,
3123 .priv_size = sizeof(struct vxlan_dev),
3124 .setup = vxlan_setup,
3125 .validate = vxlan_validate,
3126 .newlink = vxlan_newlink,
3127 .dellink = vxlan_dellink,
3128 .get_size = vxlan_get_size,
3129 .fill_info = vxlan_fill_info,
3130 .get_link_net = vxlan_get_link_net,
3131};
3132
3133static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3134 struct net_device *dev)
3135{
3136 struct vxlan_dev *vxlan, *next;
3137 LIST_HEAD(list_kill);
3138
3139 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3140 struct vxlan_rdst *dst = &vxlan->default_dst;
3141
3142 /* In case we created vxlan device with carrier
3143 * and we loose the carrier due to module unload
3144 * we also need to remove vxlan device. In other
3145 * cases, it's not necessary and remote_ifindex
3146 * is 0 here, so no matches.
3147 */
3148 if (dst->remote_ifindex == dev->ifindex)
3149 vxlan_dellink(vxlan->dev, &list_kill);
3150 }
3151
3152 unregister_netdevice_many(&list_kill);
3153}
3154
3155static int vxlan_lowerdev_event(struct notifier_block *unused,
3156 unsigned long event, void *ptr)
3157{
3158 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3159 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3160
3161 if (event == NETDEV_UNREGISTER)
3162 vxlan_handle_lowerdev_unregister(vn, dev);
3163
3164 return NOTIFY_DONE;
3165}
3166
3167static struct notifier_block vxlan_notifier_block __read_mostly = {
3168 .notifier_call = vxlan_lowerdev_event,
3169};
3170
3171static __net_init int vxlan_init_net(struct net *net)
3172{
3173 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3174 unsigned int h;
3175
3176 INIT_LIST_HEAD(&vn->vxlan_list);
3177 spin_lock_init(&vn->sock_lock);
3178
3179 for (h = 0; h < PORT_HASH_SIZE; ++h)
3180 INIT_HLIST_HEAD(&vn->sock_list[h]);
3181
3182 return 0;
3183}
3184
3185static void __net_exit vxlan_exit_net(struct net *net)
3186{
3187 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3188 struct vxlan_dev *vxlan, *next;
3189 struct net_device *dev, *aux;
3190 LIST_HEAD(list);
3191
3192 rtnl_lock();
3193 for_each_netdev_safe(net, dev, aux)
3194 if (dev->rtnl_link_ops == &vxlan_link_ops)
3195 unregister_netdevice_queue(dev, &list);
3196
3197 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3198 /* If vxlan->dev is in the same netns, it has already been added
3199 * to the list by the previous loop.
3200 */
3201 if (!net_eq(dev_net(vxlan->dev), net)) {
3202 gro_cells_destroy(&vxlan->gro_cells);
3203 unregister_netdevice_queue(vxlan->dev, &list);
3204 }
3205 }
3206
3207 unregister_netdevice_many(&list);
3208 rtnl_unlock();
3209}
3210
3211static struct pernet_operations vxlan_net_ops = {
3212 .init = vxlan_init_net,
3213 .exit = vxlan_exit_net,
3214 .id = &vxlan_net_id,
3215 .size = sizeof(struct vxlan_net),
3216};
3217
3218static int __init vxlan_init_module(void)
3219{
3220 int rc;
3221
3222 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3223 if (!vxlan_wq)
3224 return -ENOMEM;
3225
3226 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3227
3228 rc = register_pernet_subsys(&vxlan_net_ops);
3229 if (rc)
3230 goto out1;
3231
3232 rc = register_netdevice_notifier(&vxlan_notifier_block);
3233 if (rc)
3234 goto out2;
3235
3236 rc = rtnl_link_register(&vxlan_link_ops);
3237 if (rc)
3238 goto out3;
3239
3240 return 0;
3241out3:
3242 unregister_netdevice_notifier(&vxlan_notifier_block);
3243out2:
3244 unregister_pernet_subsys(&vxlan_net_ops);
3245out1:
3246 destroy_workqueue(vxlan_wq);
3247 return rc;
3248}
3249late_initcall(vxlan_init_module);
3250
3251static void __exit vxlan_cleanup_module(void)
3252{
3253 rtnl_link_unregister(&vxlan_link_ops);
3254 unregister_netdevice_notifier(&vxlan_notifier_block);
3255 destroy_workqueue(vxlan_wq);
3256 unregister_pernet_subsys(&vxlan_net_ops);
3257 /* rcu_barrier() is called by netns */
3258}
3259module_exit(vxlan_cleanup_module);
3260
3261MODULE_LICENSE("GPL");
3262MODULE_VERSION(VXLAN_VERSION);
3263MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3264MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3265MODULE_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");