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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/*
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/rtnetlink.h>
37#include <net/route.h>
38#include <net/dsfield.h>
39#include <net/inet_ecn.h>
40#include <net/net_namespace.h>
41#include <net/netns/generic.h>
42#include <net/vxlan.h>
43#include <net/protocol.h>
44#if IS_ENABLED(CONFIG_IPV6)
45#include <net/ipv6.h>
46#include <net/addrconf.h>
47#include <net/ip6_tunnel.h>
48#include <net/ip6_checksum.h>
49#endif
50
51#define VXLAN_VERSION "0.1"
52
53#define PORT_HASH_BITS 8
54#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
55#define VNI_HASH_BITS 10
56#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
57#define FDB_HASH_BITS 8
58#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
59#define FDB_AGE_DEFAULT 300 /* 5 min */
60#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61
62#define VXLAN_N_VID (1u << 24)
63#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
64#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
65
66#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
67
68/* VXLAN protocol header */
69struct vxlanhdr {
70 __be32 vx_flags;
71 __be32 vx_vni;
72};
73
74/* UDP port for VXLAN traffic.
75 * The IANA assigned port is 4789, but the Linux default is 8472
76 * for compatibility with early adopters.
77 */
78static unsigned short vxlan_port __read_mostly = 8472;
79module_param_named(udp_port, vxlan_port, ushort, 0444);
80MODULE_PARM_DESC(udp_port, "Destination UDP port");
81
82static bool log_ecn_error = true;
83module_param(log_ecn_error, bool, 0644);
84MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
85
86static int vxlan_net_id;
87
88static const u8 all_zeros_mac[ETH_ALEN];
89
90/* per-network namespace private data for this module */
91struct vxlan_net {
92 struct list_head vxlan_list;
93 struct hlist_head sock_list[PORT_HASH_SIZE];
94 spinlock_t sock_lock;
95};
96
97union vxlan_addr {
98 struct sockaddr_in sin;
99 struct sockaddr_in6 sin6;
100 struct sockaddr sa;
101};
102
103struct vxlan_rdst {
104 union vxlan_addr remote_ip;
105 __be16 remote_port;
106 u32 remote_vni;
107 u32 remote_ifindex;
108 struct list_head list;
109 struct rcu_head rcu;
110};
111
112/* Forwarding table entry */
113struct vxlan_fdb {
114 struct hlist_node hlist; /* linked list of entries */
115 struct rcu_head rcu;
116 unsigned long updated; /* jiffies */
117 unsigned long used;
118 struct list_head remotes;
119 u16 state; /* see ndm_state */
120 u8 flags; /* see ndm_flags */
121 u8 eth_addr[ETH_ALEN];
122};
123
124/* Pseudo network device */
125struct vxlan_dev {
126 struct hlist_node hlist; /* vni hash table */
127 struct list_head next; /* vxlan's per namespace list */
128 struct vxlan_sock *vn_sock; /* listening socket */
129 struct net_device *dev;
130 struct vxlan_rdst default_dst; /* default destination */
131 union vxlan_addr saddr; /* source address */
132 __be16 dst_port;
133 __u16 port_min; /* source port range */
134 __u16 port_max;
135 __u8 tos; /* TOS override */
136 __u8 ttl;
137 u32 flags; /* VXLAN_F_* below */
138
139 struct work_struct sock_work;
140 struct work_struct igmp_join;
141 struct work_struct igmp_leave;
142
143 unsigned long age_interval;
144 struct timer_list age_timer;
145 spinlock_t hash_lock;
146 unsigned int addrcnt;
147 unsigned int addrmax;
148
149 struct hlist_head fdb_head[FDB_HASH_SIZE];
150};
151
152#define VXLAN_F_LEARN 0x01
153#define VXLAN_F_PROXY 0x02
154#define VXLAN_F_RSC 0x04
155#define VXLAN_F_L2MISS 0x08
156#define VXLAN_F_L3MISS 0x10
157#define VXLAN_F_IPV6 0x20 /* internal flag */
158
159/* salt for hash table */
160static u32 vxlan_salt __read_mostly;
161static struct workqueue_struct *vxlan_wq;
162
163static void vxlan_sock_work(struct work_struct *work);
164
165#if IS_ENABLED(CONFIG_IPV6)
166static inline
167bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
168{
169 if (a->sa.sa_family != b->sa.sa_family)
170 return false;
171 if (a->sa.sa_family == AF_INET6)
172 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
173 else
174 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
175}
176
177static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
178{
179 if (ipa->sa.sa_family == AF_INET6)
180 return ipv6_addr_any(&ipa->sin6.sin6_addr);
181 else
182 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
183}
184
185static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
186{
187 if (ipa->sa.sa_family == AF_INET6)
188 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
189 else
190 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
191}
192
193static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
194{
195 if (nla_len(nla) >= sizeof(struct in6_addr)) {
196 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
197 ip->sa.sa_family = AF_INET6;
198 return 0;
199 } else if (nla_len(nla) >= sizeof(__be32)) {
200 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
201 ip->sa.sa_family = AF_INET;
202 return 0;
203 } else {
204 return -EAFNOSUPPORT;
205 }
206}
207
208static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
209 const union vxlan_addr *ip)
210{
211 if (ip->sa.sa_family == AF_INET6)
212 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
213 else
214 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
215}
216
217#else /* !CONFIG_IPV6 */
218
219static inline
220bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
221{
222 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
223}
224
225static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
226{
227 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
228}
229
230static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
231{
232 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
233}
234
235static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
236{
237 if (nla_len(nla) >= sizeof(struct in6_addr)) {
238 return -EAFNOSUPPORT;
239 } else if (nla_len(nla) >= sizeof(__be32)) {
240 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
241 ip->sa.sa_family = AF_INET;
242 return 0;
243 } else {
244 return -EAFNOSUPPORT;
245 }
246}
247
248static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
249 const union vxlan_addr *ip)
250{
251 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
252}
253#endif
254
255/* Virtual Network hash table head */
256static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
257{
258 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
259}
260
261/* Socket hash table head */
262static inline struct hlist_head *vs_head(struct net *net, __be16 port)
263{
264 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
265
266 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
267}
268
269/* First remote destination for a forwarding entry.
270 * Guaranteed to be non-NULL because remotes are never deleted.
271 */
272static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
273{
274 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
275}
276
277static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
278{
279 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
280}
281
282/* Find VXLAN socket based on network namespace and UDP port */
283static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
284{
285 struct vxlan_sock *vs;
286
287 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
288 if (inet_sk(vs->sock->sk)->inet_sport == port)
289 return vs;
290 }
291 return NULL;
292}
293
294static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
295{
296 struct vxlan_dev *vxlan;
297
298 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
299 if (vxlan->default_dst.remote_vni == id)
300 return vxlan;
301 }
302
303 return NULL;
304}
305
306/* Look up VNI in a per net namespace table */
307static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
308{
309 struct vxlan_sock *vs;
310
311 vs = vxlan_find_sock(net, port);
312 if (!vs)
313 return NULL;
314
315 return vxlan_vs_find_vni(vs, id);
316}
317
318/* Fill in neighbour message in skbuff. */
319static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
320 const struct vxlan_fdb *fdb,
321 u32 portid, u32 seq, int type, unsigned int flags,
322 const struct vxlan_rdst *rdst)
323{
324 unsigned long now = jiffies;
325 struct nda_cacheinfo ci;
326 struct nlmsghdr *nlh;
327 struct ndmsg *ndm;
328 bool send_ip, send_eth;
329
330 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
331 if (nlh == NULL)
332 return -EMSGSIZE;
333
334 ndm = nlmsg_data(nlh);
335 memset(ndm, 0, sizeof(*ndm));
336
337 send_eth = send_ip = true;
338
339 if (type == RTM_GETNEIGH) {
340 ndm->ndm_family = AF_INET;
341 send_ip = !vxlan_addr_any(&rdst->remote_ip);
342 send_eth = !is_zero_ether_addr(fdb->eth_addr);
343 } else
344 ndm->ndm_family = AF_BRIDGE;
345 ndm->ndm_state = fdb->state;
346 ndm->ndm_ifindex = vxlan->dev->ifindex;
347 ndm->ndm_flags = fdb->flags;
348 ndm->ndm_type = NDA_DST;
349
350 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
351 goto nla_put_failure;
352
353 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
354 goto nla_put_failure;
355
356 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
357 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
358 goto nla_put_failure;
359 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
360 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
361 goto nla_put_failure;
362 if (rdst->remote_ifindex &&
363 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
364 goto nla_put_failure;
365
366 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
367 ci.ndm_confirmed = 0;
368 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
369 ci.ndm_refcnt = 0;
370
371 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
372 goto nla_put_failure;
373
374 return nlmsg_end(skb, nlh);
375
376nla_put_failure:
377 nlmsg_cancel(skb, nlh);
378 return -EMSGSIZE;
379}
380
381static inline size_t vxlan_nlmsg_size(void)
382{
383 return NLMSG_ALIGN(sizeof(struct ndmsg))
384 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
385 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
386 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
387 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
388 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
389 + nla_total_size(sizeof(struct nda_cacheinfo));
390}
391
392static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
393 struct vxlan_rdst *rd, int type)
394{
395 struct net *net = dev_net(vxlan->dev);
396 struct sk_buff *skb;
397 int err = -ENOBUFS;
398
399 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
400 if (skb == NULL)
401 goto errout;
402
403 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
404 if (err < 0) {
405 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
406 WARN_ON(err == -EMSGSIZE);
407 kfree_skb(skb);
408 goto errout;
409 }
410
411 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
412 return;
413errout:
414 if (err < 0)
415 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
416}
417
418static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
419{
420 struct vxlan_dev *vxlan = netdev_priv(dev);
421 struct vxlan_fdb f = {
422 .state = NUD_STALE,
423 };
424 struct vxlan_rdst remote = {
425 .remote_ip = *ipa, /* goes to NDA_DST */
426 .remote_vni = VXLAN_N_VID,
427 };
428
429 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
430}
431
432static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
433{
434 struct vxlan_fdb f = {
435 .state = NUD_STALE,
436 };
437 struct vxlan_rdst remote = { };
438
439 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
440
441 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
442}
443
444/* Hash Ethernet address */
445static u32 eth_hash(const unsigned char *addr)
446{
447 u64 value = get_unaligned((u64 *)addr);
448
449 /* only want 6 bytes */
450#ifdef __BIG_ENDIAN
451 value >>= 16;
452#else
453 value <<= 16;
454#endif
455 return hash_64(value, FDB_HASH_BITS);
456}
457
458/* Hash chain to use given mac address */
459static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
460 const u8 *mac)
461{
462 return &vxlan->fdb_head[eth_hash(mac)];
463}
464
465/* Look up Ethernet address in forwarding table */
466static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
467 const u8 *mac)
468{
469 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
470 struct vxlan_fdb *f;
471
472 hlist_for_each_entry_rcu(f, head, hlist) {
473 if (ether_addr_equal(mac, f->eth_addr))
474 return f;
475 }
476
477 return NULL;
478}
479
480static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
481 const u8 *mac)
482{
483 struct vxlan_fdb *f;
484
485 f = __vxlan_find_mac(vxlan, mac);
486 if (f)
487 f->used = jiffies;
488
489 return f;
490}
491
492/* caller should hold vxlan->hash_lock */
493static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
494 union vxlan_addr *ip, __be16 port,
495 __u32 vni, __u32 ifindex)
496{
497 struct vxlan_rdst *rd;
498
499 list_for_each_entry(rd, &f->remotes, list) {
500 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
501 rd->remote_port == port &&
502 rd->remote_vni == vni &&
503 rd->remote_ifindex == ifindex)
504 return rd;
505 }
506
507 return NULL;
508}
509
510/* Replace destination of unicast mac */
511static int vxlan_fdb_replace(struct vxlan_fdb *f,
512 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
513{
514 struct vxlan_rdst *rd;
515
516 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
517 if (rd)
518 return 0;
519
520 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
521 if (!rd)
522 return 0;
523 rd->remote_ip = *ip;
524 rd->remote_port = port;
525 rd->remote_vni = vni;
526 rd->remote_ifindex = ifindex;
527 return 1;
528}
529
530/* Add/update destinations for multicast */
531static int vxlan_fdb_append(struct vxlan_fdb *f,
532 union vxlan_addr *ip, __be16 port, __u32 vni,
533 __u32 ifindex, struct vxlan_rdst **rdp)
534{
535 struct vxlan_rdst *rd;
536
537 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
538 if (rd)
539 return 0;
540
541 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
542 if (rd == NULL)
543 return -ENOBUFS;
544 rd->remote_ip = *ip;
545 rd->remote_port = port;
546 rd->remote_vni = vni;
547 rd->remote_ifindex = ifindex;
548
549 list_add_tail_rcu(&rd->list, &f->remotes);
550
551 *rdp = rd;
552 return 1;
553}
554
555static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
556{
557 struct sk_buff *p, **pp = NULL;
558 struct vxlanhdr *vh, *vh2;
559 struct ethhdr *eh, *eh2;
560 unsigned int hlen, off_vx, off_eth;
561 const struct packet_offload *ptype;
562 __be16 type;
563 int flush = 1;
564
565 off_vx = skb_gro_offset(skb);
566 hlen = off_vx + sizeof(*vh);
567 vh = skb_gro_header_fast(skb, off_vx);
568 if (skb_gro_header_hard(skb, hlen)) {
569 vh = skb_gro_header_slow(skb, hlen, off_vx);
570 if (unlikely(!vh))
571 goto out;
572 }
573 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
574
575 off_eth = skb_gro_offset(skb);
576 hlen = off_eth + sizeof(*eh);
577 eh = skb_gro_header_fast(skb, off_eth);
578 if (skb_gro_header_hard(skb, hlen)) {
579 eh = skb_gro_header_slow(skb, hlen, off_eth);
580 if (unlikely(!eh))
581 goto out;
582 }
583
584 flush = 0;
585
586 for (p = *head; p; p = p->next) {
587 if (!NAPI_GRO_CB(p)->same_flow)
588 continue;
589
590 vh2 = (struct vxlanhdr *)(p->data + off_vx);
591 eh2 = (struct ethhdr *)(p->data + off_eth);
592 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
593 NAPI_GRO_CB(p)->same_flow = 0;
594 continue;
595 }
596 }
597
598 type = eh->h_proto;
599
600 rcu_read_lock();
601 ptype = gro_find_receive_by_type(type);
602 if (ptype == NULL) {
603 flush = 1;
604 goto out_unlock;
605 }
606
607 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
608 pp = ptype->callbacks.gro_receive(head, skb);
609
610out_unlock:
611 rcu_read_unlock();
612out:
613 NAPI_GRO_CB(skb)->flush |= flush;
614
615 return pp;
616}
617
618static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
619{
620 struct ethhdr *eh;
621 struct packet_offload *ptype;
622 __be16 type;
623 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
624 int err = -ENOSYS;
625
626 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
627 type = eh->h_proto;
628
629 rcu_read_lock();
630 ptype = gro_find_complete_by_type(type);
631 if (ptype != NULL)
632 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
633
634 rcu_read_unlock();
635 return err;
636}
637
638/* Notify netdevs that UDP port started listening */
639static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
640{
641 struct net_device *dev;
642 struct sock *sk = vs->sock->sk;
643 struct net *net = sock_net(sk);
644 sa_family_t sa_family = sk->sk_family;
645 __be16 port = inet_sk(sk)->inet_sport;
646 int err;
647
648 if (sa_family == AF_INET) {
649 err = udp_add_offload(&vs->udp_offloads);
650 if (err)
651 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
652 }
653
654 rcu_read_lock();
655 for_each_netdev_rcu(net, dev) {
656 if (dev->netdev_ops->ndo_add_vxlan_port)
657 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
658 port);
659 }
660 rcu_read_unlock();
661}
662
663/* Notify netdevs that UDP port is no more listening */
664static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
665{
666 struct net_device *dev;
667 struct sock *sk = vs->sock->sk;
668 struct net *net = sock_net(sk);
669 sa_family_t sa_family = sk->sk_family;
670 __be16 port = inet_sk(sk)->inet_sport;
671
672 rcu_read_lock();
673 for_each_netdev_rcu(net, dev) {
674 if (dev->netdev_ops->ndo_del_vxlan_port)
675 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
676 port);
677 }
678 rcu_read_unlock();
679
680 if (sa_family == AF_INET)
681 udp_del_offload(&vs->udp_offloads);
682}
683
684/* Add new entry to forwarding table -- assumes lock held */
685static int vxlan_fdb_create(struct vxlan_dev *vxlan,
686 const u8 *mac, union vxlan_addr *ip,
687 __u16 state, __u16 flags,
688 __be16 port, __u32 vni, __u32 ifindex,
689 __u8 ndm_flags)
690{
691 struct vxlan_rdst *rd = NULL;
692 struct vxlan_fdb *f;
693 int notify = 0;
694
695 f = __vxlan_find_mac(vxlan, mac);
696 if (f) {
697 if (flags & NLM_F_EXCL) {
698 netdev_dbg(vxlan->dev,
699 "lost race to create %pM\n", mac);
700 return -EEXIST;
701 }
702 if (f->state != state) {
703 f->state = state;
704 f->updated = jiffies;
705 notify = 1;
706 }
707 if (f->flags != ndm_flags) {
708 f->flags = ndm_flags;
709 f->updated = jiffies;
710 notify = 1;
711 }
712 if ((flags & NLM_F_REPLACE)) {
713 /* Only change unicasts */
714 if (!(is_multicast_ether_addr(f->eth_addr) ||
715 is_zero_ether_addr(f->eth_addr))) {
716 int rc = vxlan_fdb_replace(f, ip, port, vni,
717 ifindex);
718
719 if (rc < 0)
720 return rc;
721 notify |= rc;
722 } else
723 return -EOPNOTSUPP;
724 }
725 if ((flags & NLM_F_APPEND) &&
726 (is_multicast_ether_addr(f->eth_addr) ||
727 is_zero_ether_addr(f->eth_addr))) {
728 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
729 &rd);
730
731 if (rc < 0)
732 return rc;
733 notify |= rc;
734 }
735 } else {
736 if (!(flags & NLM_F_CREATE))
737 return -ENOENT;
738
739 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
740 return -ENOSPC;
741
742 /* Disallow replace to add a multicast entry */
743 if ((flags & NLM_F_REPLACE) &&
744 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
745 return -EOPNOTSUPP;
746
747 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
748 f = kmalloc(sizeof(*f), GFP_ATOMIC);
749 if (!f)
750 return -ENOMEM;
751
752 notify = 1;
753 f->state = state;
754 f->flags = ndm_flags;
755 f->updated = f->used = jiffies;
756 INIT_LIST_HEAD(&f->remotes);
757 memcpy(f->eth_addr, mac, ETH_ALEN);
758
759 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
760
761 ++vxlan->addrcnt;
762 hlist_add_head_rcu(&f->hlist,
763 vxlan_fdb_head(vxlan, mac));
764 }
765
766 if (notify) {
767 if (rd == NULL)
768 rd = first_remote_rtnl(f);
769 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
770 }
771
772 return 0;
773}
774
775static void vxlan_fdb_free(struct rcu_head *head)
776{
777 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
778 struct vxlan_rdst *rd, *nd;
779
780 list_for_each_entry_safe(rd, nd, &f->remotes, list)
781 kfree(rd);
782 kfree(f);
783}
784
785static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
786{
787 netdev_dbg(vxlan->dev,
788 "delete %pM\n", f->eth_addr);
789
790 --vxlan->addrcnt;
791 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
792
793 hlist_del_rcu(&f->hlist);
794 call_rcu(&f->rcu, vxlan_fdb_free);
795}
796
797static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
798 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
799{
800 struct net *net = dev_net(vxlan->dev);
801 int err;
802
803 if (tb[NDA_DST]) {
804 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
805 if (err)
806 return err;
807 } else {
808 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
809 if (remote->sa.sa_family == AF_INET) {
810 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
811 ip->sa.sa_family = AF_INET;
812#if IS_ENABLED(CONFIG_IPV6)
813 } else {
814 ip->sin6.sin6_addr = in6addr_any;
815 ip->sa.sa_family = AF_INET6;
816#endif
817 }
818 }
819
820 if (tb[NDA_PORT]) {
821 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
822 return -EINVAL;
823 *port = nla_get_be16(tb[NDA_PORT]);
824 } else {
825 *port = vxlan->dst_port;
826 }
827
828 if (tb[NDA_VNI]) {
829 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
830 return -EINVAL;
831 *vni = nla_get_u32(tb[NDA_VNI]);
832 } else {
833 *vni = vxlan->default_dst.remote_vni;
834 }
835
836 if (tb[NDA_IFINDEX]) {
837 struct net_device *tdev;
838
839 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
840 return -EINVAL;
841 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
842 tdev = __dev_get_by_index(net, *ifindex);
843 if (!tdev)
844 return -EADDRNOTAVAIL;
845 } else {
846 *ifindex = 0;
847 }
848
849 return 0;
850}
851
852/* Add static entry (via netlink) */
853static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
854 struct net_device *dev,
855 const unsigned char *addr, u16 flags)
856{
857 struct vxlan_dev *vxlan = netdev_priv(dev);
858 /* struct net *net = dev_net(vxlan->dev); */
859 union vxlan_addr ip;
860 __be16 port;
861 u32 vni, ifindex;
862 int err;
863
864 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
865 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
866 ndm->ndm_state);
867 return -EINVAL;
868 }
869
870 if (tb[NDA_DST] == NULL)
871 return -EINVAL;
872
873 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
874 if (err)
875 return err;
876
877 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
878 return -EAFNOSUPPORT;
879
880 spin_lock_bh(&vxlan->hash_lock);
881 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
882 port, vni, ifindex, ndm->ndm_flags);
883 spin_unlock_bh(&vxlan->hash_lock);
884
885 return err;
886}
887
888/* Delete entry (via netlink) */
889static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
890 struct net_device *dev,
891 const unsigned char *addr)
892{
893 struct vxlan_dev *vxlan = netdev_priv(dev);
894 struct vxlan_fdb *f;
895 struct vxlan_rdst *rd = NULL;
896 union vxlan_addr ip;
897 __be16 port;
898 u32 vni, ifindex;
899 int err;
900
901 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
902 if (err)
903 return err;
904
905 err = -ENOENT;
906
907 spin_lock_bh(&vxlan->hash_lock);
908 f = vxlan_find_mac(vxlan, addr);
909 if (!f)
910 goto out;
911
912 if (!vxlan_addr_any(&ip)) {
913 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
914 if (!rd)
915 goto out;
916 }
917
918 err = 0;
919
920 /* remove a destination if it's not the only one on the list,
921 * otherwise destroy the fdb entry
922 */
923 if (rd && !list_is_singular(&f->remotes)) {
924 list_del_rcu(&rd->list);
925 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
926 kfree_rcu(rd, rcu);
927 goto out;
928 }
929
930 vxlan_fdb_destroy(vxlan, f);
931
932out:
933 spin_unlock_bh(&vxlan->hash_lock);
934
935 return err;
936}
937
938/* Dump forwarding table */
939static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
940 struct net_device *dev, int idx)
941{
942 struct vxlan_dev *vxlan = netdev_priv(dev);
943 unsigned int h;
944
945 for (h = 0; h < FDB_HASH_SIZE; ++h) {
946 struct vxlan_fdb *f;
947 int err;
948
949 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
950 struct vxlan_rdst *rd;
951
952 if (idx < cb->args[0])
953 goto skip;
954
955 list_for_each_entry_rcu(rd, &f->remotes, list) {
956 err = vxlan_fdb_info(skb, vxlan, f,
957 NETLINK_CB(cb->skb).portid,
958 cb->nlh->nlmsg_seq,
959 RTM_NEWNEIGH,
960 NLM_F_MULTI, rd);
961 if (err < 0)
962 goto out;
963 }
964skip:
965 ++idx;
966 }
967 }
968out:
969 return idx;
970}
971
972/* Watch incoming packets to learn mapping between Ethernet address
973 * and Tunnel endpoint.
974 * Return true if packet is bogus and should be droppped.
975 */
976static bool vxlan_snoop(struct net_device *dev,
977 union vxlan_addr *src_ip, const u8 *src_mac)
978{
979 struct vxlan_dev *vxlan = netdev_priv(dev);
980 struct vxlan_fdb *f;
981
982 f = vxlan_find_mac(vxlan, src_mac);
983 if (likely(f)) {
984 struct vxlan_rdst *rdst = first_remote_rcu(f);
985
986 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
987 return false;
988
989 /* Don't migrate static entries, drop packets */
990 if (f->state & NUD_NOARP)
991 return true;
992
993 if (net_ratelimit())
994 netdev_info(dev,
995 "%pM migrated from %pIS to %pIS\n",
996 src_mac, &rdst->remote_ip, &src_ip);
997
998 rdst->remote_ip = *src_ip;
999 f->updated = jiffies;
1000 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1001 } else {
1002 /* learned new entry */
1003 spin_lock(&vxlan->hash_lock);
1004
1005 /* close off race between vxlan_flush and incoming packets */
1006 if (netif_running(dev))
1007 vxlan_fdb_create(vxlan, src_mac, src_ip,
1008 NUD_REACHABLE,
1009 NLM_F_EXCL|NLM_F_CREATE,
1010 vxlan->dst_port,
1011 vxlan->default_dst.remote_vni,
1012 0, NTF_SELF);
1013 spin_unlock(&vxlan->hash_lock);
1014 }
1015
1016 return false;
1017}
1018
1019/* See if multicast group is already in use by other ID */
1020static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1021{
1022 struct vxlan_dev *vxlan;
1023
1024 /* The vxlan_sock is only used by dev, leaving group has
1025 * no effect on other vxlan devices.
1026 */
1027 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1028 return false;
1029
1030 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1031 if (!netif_running(vxlan->dev) || vxlan == dev)
1032 continue;
1033
1034 if (vxlan->vn_sock != dev->vn_sock)
1035 continue;
1036
1037 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1038 &dev->default_dst.remote_ip))
1039 continue;
1040
1041 if (vxlan->default_dst.remote_ifindex !=
1042 dev->default_dst.remote_ifindex)
1043 continue;
1044
1045 return true;
1046 }
1047
1048 return false;
1049}
1050
1051static void vxlan_sock_hold(struct vxlan_sock *vs)
1052{
1053 atomic_inc(&vs->refcnt);
1054}
1055
1056void vxlan_sock_release(struct vxlan_sock *vs)
1057{
1058 struct sock *sk = vs->sock->sk;
1059 struct net *net = sock_net(sk);
1060 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1061
1062 if (!atomic_dec_and_test(&vs->refcnt))
1063 return;
1064
1065 spin_lock(&vn->sock_lock);
1066 hlist_del_rcu(&vs->hlist);
1067 rcu_assign_sk_user_data(vs->sock->sk, NULL);
1068 vxlan_notify_del_rx_port(vs);
1069 spin_unlock(&vn->sock_lock);
1070
1071 queue_work(vxlan_wq, &vs->del_work);
1072}
1073EXPORT_SYMBOL_GPL(vxlan_sock_release);
1074
1075/* Callback to update multicast group membership when first VNI on
1076 * multicast asddress is brought up
1077 * Done as workqueue because ip_mc_join_group acquires RTNL.
1078 */
1079static void vxlan_igmp_join(struct work_struct *work)
1080{
1081 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1082 struct vxlan_sock *vs = vxlan->vn_sock;
1083 struct sock *sk = vs->sock->sk;
1084 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1085 int ifindex = vxlan->default_dst.remote_ifindex;
1086
1087 lock_sock(sk);
1088 if (ip->sa.sa_family == AF_INET) {
1089 struct ip_mreqn mreq = {
1090 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1091 .imr_ifindex = ifindex,
1092 };
1093
1094 ip_mc_join_group(sk, &mreq);
1095#if IS_ENABLED(CONFIG_IPV6)
1096 } else {
1097 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1098 &ip->sin6.sin6_addr);
1099#endif
1100 }
1101 release_sock(sk);
1102
1103 vxlan_sock_release(vs);
1104 dev_put(vxlan->dev);
1105}
1106
1107/* Inverse of vxlan_igmp_join when last VNI is brought down */
1108static void vxlan_igmp_leave(struct work_struct *work)
1109{
1110 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1111 struct vxlan_sock *vs = vxlan->vn_sock;
1112 struct sock *sk = vs->sock->sk;
1113 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1114 int ifindex = vxlan->default_dst.remote_ifindex;
1115
1116 lock_sock(sk);
1117 if (ip->sa.sa_family == AF_INET) {
1118 struct ip_mreqn mreq = {
1119 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1120 .imr_ifindex = ifindex,
1121 };
1122
1123 ip_mc_leave_group(sk, &mreq);
1124#if IS_ENABLED(CONFIG_IPV6)
1125 } else {
1126 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1127 &ip->sin6.sin6_addr);
1128#endif
1129 }
1130
1131 release_sock(sk);
1132
1133 vxlan_sock_release(vs);
1134 dev_put(vxlan->dev);
1135}
1136
1137/* Callback from net/ipv4/udp.c to receive packets */
1138static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1139{
1140 struct vxlan_sock *vs;
1141 struct vxlanhdr *vxh;
1142
1143 /* Need Vxlan and inner Ethernet header to be present */
1144 if (!pskb_may_pull(skb, VXLAN_HLEN))
1145 goto error;
1146
1147 /* Return packets with reserved bits set */
1148 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1149 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1150 (vxh->vx_vni & htonl(0xff))) {
1151 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1152 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1153 goto error;
1154 }
1155
1156 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1157 goto drop;
1158
1159 vs = rcu_dereference_sk_user_data(sk);
1160 if (!vs)
1161 goto drop;
1162
1163 /* If the NIC driver gave us an encapsulated packet
1164 * with the encapsulation mark, the device checksummed it
1165 * for us. Otherwise force the upper layers to verify it.
1166 */
1167 if ((skb->ip_summed != CHECKSUM_UNNECESSARY && skb->ip_summed != CHECKSUM_PARTIAL) ||
1168 !skb->encapsulation)
1169 skb->ip_summed = CHECKSUM_NONE;
1170
1171 skb->encapsulation = 0;
1172
1173 vs->rcv(vs, skb, vxh->vx_vni);
1174 return 0;
1175
1176drop:
1177 /* Consume bad packet */
1178 kfree_skb(skb);
1179 return 0;
1180
1181error:
1182 /* Return non vxlan pkt */
1183 return 1;
1184}
1185
1186static void vxlan_rcv(struct vxlan_sock *vs,
1187 struct sk_buff *skb, __be32 vx_vni)
1188{
1189 struct iphdr *oip = NULL;
1190 struct ipv6hdr *oip6 = NULL;
1191 struct vxlan_dev *vxlan;
1192 struct pcpu_sw_netstats *stats;
1193 union vxlan_addr saddr;
1194 __u32 vni;
1195 int err = 0;
1196 union vxlan_addr *remote_ip;
1197
1198 vni = ntohl(vx_vni) >> 8;
1199 /* Is this VNI defined? */
1200 vxlan = vxlan_vs_find_vni(vs, vni);
1201 if (!vxlan)
1202 goto drop;
1203
1204 remote_ip = &vxlan->default_dst.remote_ip;
1205 skb_reset_mac_header(skb);
1206 skb->protocol = eth_type_trans(skb, vxlan->dev);
1207
1208 /* Ignore packet loops (and multicast echo) */
1209 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1210 goto drop;
1211
1212 /* Re-examine inner Ethernet packet */
1213 if (remote_ip->sa.sa_family == AF_INET) {
1214 oip = ip_hdr(skb);
1215 saddr.sin.sin_addr.s_addr = oip->saddr;
1216 saddr.sa.sa_family = AF_INET;
1217#if IS_ENABLED(CONFIG_IPV6)
1218 } else {
1219 oip6 = ipv6_hdr(skb);
1220 saddr.sin6.sin6_addr = oip6->saddr;
1221 saddr.sa.sa_family = AF_INET6;
1222#endif
1223 }
1224
1225 if ((vxlan->flags & VXLAN_F_LEARN) &&
1226 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1227 goto drop;
1228
1229 skb_reset_network_header(skb);
1230
1231 if (oip6)
1232 err = IP6_ECN_decapsulate(oip6, skb);
1233 if (oip)
1234 err = IP_ECN_decapsulate(oip, skb);
1235
1236 if (unlikely(err)) {
1237 if (log_ecn_error) {
1238 if (oip6)
1239 net_info_ratelimited("non-ECT from %pI6\n",
1240 &oip6->saddr);
1241 if (oip)
1242 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1243 &oip->saddr, oip->tos);
1244 }
1245 if (err > 1) {
1246 ++vxlan->dev->stats.rx_frame_errors;
1247 ++vxlan->dev->stats.rx_errors;
1248 goto drop;
1249 }
1250 }
1251
1252 stats = this_cpu_ptr(vxlan->dev->tstats);
1253 u64_stats_update_begin(&stats->syncp);
1254 stats->rx_packets++;
1255 stats->rx_bytes += skb->len;
1256 u64_stats_update_end(&stats->syncp);
1257
1258 netif_rx(skb);
1259
1260 return;
1261drop:
1262 /* Consume bad packet */
1263 kfree_skb(skb);
1264}
1265
1266static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1267{
1268 struct vxlan_dev *vxlan = netdev_priv(dev);
1269 struct arphdr *parp;
1270 u8 *arpptr, *sha;
1271 __be32 sip, tip;
1272 struct neighbour *n;
1273
1274 if (dev->flags & IFF_NOARP)
1275 goto out;
1276
1277 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1278 dev->stats.tx_dropped++;
1279 goto out;
1280 }
1281 parp = arp_hdr(skb);
1282
1283 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1284 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1285 parp->ar_pro != htons(ETH_P_IP) ||
1286 parp->ar_op != htons(ARPOP_REQUEST) ||
1287 parp->ar_hln != dev->addr_len ||
1288 parp->ar_pln != 4)
1289 goto out;
1290 arpptr = (u8 *)parp + sizeof(struct arphdr);
1291 sha = arpptr;
1292 arpptr += dev->addr_len; /* sha */
1293 memcpy(&sip, arpptr, sizeof(sip));
1294 arpptr += sizeof(sip);
1295 arpptr += dev->addr_len; /* tha */
1296 memcpy(&tip, arpptr, sizeof(tip));
1297
1298 if (ipv4_is_loopback(tip) ||
1299 ipv4_is_multicast(tip))
1300 goto out;
1301
1302 n = neigh_lookup(&arp_tbl, &tip, dev);
1303
1304 if (n) {
1305 struct vxlan_fdb *f;
1306 struct sk_buff *reply;
1307
1308 if (!(n->nud_state & NUD_CONNECTED)) {
1309 neigh_release(n);
1310 goto out;
1311 }
1312
1313 f = vxlan_find_mac(vxlan, n->ha);
1314 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1315 /* bridge-local neighbor */
1316 neigh_release(n);
1317 goto out;
1318 }
1319
1320 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1321 n->ha, sha);
1322
1323 neigh_release(n);
1324
1325 if (reply == NULL)
1326 goto out;
1327
1328 skb_reset_mac_header(reply);
1329 __skb_pull(reply, skb_network_offset(reply));
1330 reply->ip_summed = CHECKSUM_UNNECESSARY;
1331 reply->pkt_type = PACKET_HOST;
1332
1333 if (netif_rx_ni(reply) == NET_RX_DROP)
1334 dev->stats.rx_dropped++;
1335 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1336 union vxlan_addr ipa = {
1337 .sin.sin_addr.s_addr = tip,
1338 .sa.sa_family = AF_INET,
1339 };
1340
1341 vxlan_ip_miss(dev, &ipa);
1342 }
1343out:
1344 consume_skb(skb);
1345 return NETDEV_TX_OK;
1346}
1347
1348#if IS_ENABLED(CONFIG_IPV6)
1349
1350static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1351 struct neighbour *n, bool isrouter)
1352{
1353 struct net_device *dev = request->dev;
1354 struct sk_buff *reply;
1355 struct nd_msg *ns, *na;
1356 struct ipv6hdr *pip6;
1357 u8 *daddr;
1358 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1359 int ns_olen;
1360 int i, len;
1361
1362 if (dev == NULL)
1363 return NULL;
1364
1365 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1366 sizeof(*na) + na_olen + dev->needed_tailroom;
1367 reply = alloc_skb(len, GFP_ATOMIC);
1368 if (reply == NULL)
1369 return NULL;
1370
1371 reply->protocol = htons(ETH_P_IPV6);
1372 reply->dev = dev;
1373 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1374 skb_push(reply, sizeof(struct ethhdr));
1375 skb_set_mac_header(reply, 0);
1376
1377 ns = (struct nd_msg *)skb_transport_header(request);
1378
1379 daddr = eth_hdr(request)->h_source;
1380 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1381 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1382 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1383 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1384 break;
1385 }
1386 }
1387
1388 /* Ethernet header */
1389 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1390 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1391 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1392 reply->protocol = htons(ETH_P_IPV6);
1393
1394 skb_pull(reply, sizeof(struct ethhdr));
1395 skb_set_network_header(reply, 0);
1396 skb_put(reply, sizeof(struct ipv6hdr));
1397
1398 /* IPv6 header */
1399
1400 pip6 = ipv6_hdr(reply);
1401 memset(pip6, 0, sizeof(struct ipv6hdr));
1402 pip6->version = 6;
1403 pip6->priority = ipv6_hdr(request)->priority;
1404 pip6->nexthdr = IPPROTO_ICMPV6;
1405 pip6->hop_limit = 255;
1406 pip6->daddr = ipv6_hdr(request)->saddr;
1407 pip6->saddr = *(struct in6_addr *)n->primary_key;
1408
1409 skb_pull(reply, sizeof(struct ipv6hdr));
1410 skb_set_transport_header(reply, 0);
1411
1412 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1413
1414 /* Neighbor Advertisement */
1415 memset(na, 0, sizeof(*na)+na_olen);
1416 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1417 na->icmph.icmp6_router = isrouter;
1418 na->icmph.icmp6_override = 1;
1419 na->icmph.icmp6_solicited = 1;
1420 na->target = ns->target;
1421 ether_addr_copy(&na->opt[2], n->ha);
1422 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1423 na->opt[1] = na_olen >> 3;
1424
1425 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1426 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1427 csum_partial(na, sizeof(*na)+na_olen, 0));
1428
1429 pip6->payload_len = htons(sizeof(*na)+na_olen);
1430
1431 skb_push(reply, sizeof(struct ipv6hdr));
1432
1433 reply->ip_summed = CHECKSUM_UNNECESSARY;
1434
1435 return reply;
1436}
1437
1438static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1439{
1440 struct vxlan_dev *vxlan = netdev_priv(dev);
1441 struct nd_msg *msg;
1442 const struct ipv6hdr *iphdr;
1443 const struct in6_addr *saddr, *daddr;
1444 struct neighbour *n;
1445 struct inet6_dev *in6_dev;
1446
1447 in6_dev = __in6_dev_get(dev);
1448 if (!in6_dev)
1449 goto out;
1450
1451 if (!pskb_may_pull(skb, skb->len))
1452 goto out;
1453
1454 iphdr = ipv6_hdr(skb);
1455 saddr = &iphdr->saddr;
1456 daddr = &iphdr->daddr;
1457
1458 msg = (struct nd_msg *)skb_transport_header(skb);
1459 if (msg->icmph.icmp6_code != 0 ||
1460 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1461 goto out;
1462
1463 if (ipv6_addr_loopback(daddr) ||
1464 ipv6_addr_is_multicast(&msg->target))
1465 goto out;
1466
1467 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1468
1469 if (n) {
1470 struct vxlan_fdb *f;
1471 struct sk_buff *reply;
1472
1473 if (!(n->nud_state & NUD_CONNECTED)) {
1474 neigh_release(n);
1475 goto out;
1476 }
1477
1478 f = vxlan_find_mac(vxlan, n->ha);
1479 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1480 /* bridge-local neighbor */
1481 neigh_release(n);
1482 goto out;
1483 }
1484
1485 reply = vxlan_na_create(skb, n,
1486 !!(f ? f->flags & NTF_ROUTER : 0));
1487
1488 neigh_release(n);
1489
1490 if (reply == NULL)
1491 goto out;
1492
1493 if (netif_rx_ni(reply) == NET_RX_DROP)
1494 dev->stats.rx_dropped++;
1495
1496 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1497 union vxlan_addr ipa = {
1498 .sin6.sin6_addr = msg->target,
1499 .sa.sa_family = AF_INET6,
1500 };
1501
1502 vxlan_ip_miss(dev, &ipa);
1503 }
1504
1505out:
1506 consume_skb(skb);
1507 return NETDEV_TX_OK;
1508}
1509#endif
1510
1511static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1512{
1513 struct vxlan_dev *vxlan = netdev_priv(dev);
1514 struct neighbour *n;
1515
1516 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1517 return false;
1518
1519 n = NULL;
1520 switch (ntohs(eth_hdr(skb)->h_proto)) {
1521 case ETH_P_IP:
1522 {
1523 struct iphdr *pip;
1524
1525 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1526 return false;
1527 pip = ip_hdr(skb);
1528 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1529 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1530 union vxlan_addr ipa = {
1531 .sin.sin_addr.s_addr = pip->daddr,
1532 .sa.sa_family = AF_INET,
1533 };
1534
1535 vxlan_ip_miss(dev, &ipa);
1536 return false;
1537 }
1538
1539 break;
1540 }
1541#if IS_ENABLED(CONFIG_IPV6)
1542 case ETH_P_IPV6:
1543 {
1544 struct ipv6hdr *pip6;
1545
1546 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1547 return false;
1548 pip6 = ipv6_hdr(skb);
1549 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1550 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1551 union vxlan_addr ipa = {
1552 .sin6.sin6_addr = pip6->daddr,
1553 .sa.sa_family = AF_INET6,
1554 };
1555
1556 vxlan_ip_miss(dev, &ipa);
1557 return false;
1558 }
1559
1560 break;
1561 }
1562#endif
1563 default:
1564 return false;
1565 }
1566
1567 if (n) {
1568 bool diff;
1569
1570 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1571 if (diff) {
1572 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1573 dev->addr_len);
1574 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1575 }
1576 neigh_release(n);
1577 return diff;
1578 }
1579
1580 return false;
1581}
1582
1583/* Compute source port for outgoing packet
1584 * first choice to use L4 flow hash since it will spread
1585 * better and maybe available from hardware
1586 * secondary choice is to use jhash on the Ethernet header
1587 */
1588__be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1589{
1590 unsigned int range = (port_max - port_min) + 1;
1591 u32 hash;
1592
1593 hash = skb_get_hash(skb);
1594 if (!hash)
1595 hash = jhash(skb->data, 2 * ETH_ALEN,
1596 (__force u32) skb->protocol);
1597
1598 return htons((((u64) hash * range) >> 32) + port_min);
1599}
1600EXPORT_SYMBOL_GPL(vxlan_src_port);
1601
1602static int handle_offloads(struct sk_buff *skb)
1603{
1604 if (skb_is_gso(skb)) {
1605 int err = skb_unclone(skb, GFP_ATOMIC);
1606 if (unlikely(err))
1607 return err;
1608
1609 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1610 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1611 skb->ip_summed = CHECKSUM_NONE;
1612
1613 return 0;
1614}
1615
1616#if IS_ENABLED(CONFIG_IPV6)
1617static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1618 struct dst_entry *dst, struct sk_buff *skb,
1619 struct net_device *dev, struct in6_addr *saddr,
1620 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1621 __be16 src_port, __be16 dst_port, __be32 vni)
1622{
1623 struct ipv6hdr *ip6h;
1624 struct vxlanhdr *vxh;
1625 struct udphdr *uh;
1626 int min_headroom;
1627 int err;
1628
1629 if (!skb->encapsulation) {
1630 skb_reset_inner_headers(skb);
1631 skb->encapsulation = 1;
1632 }
1633
1634 skb_scrub_packet(skb, false);
1635
1636 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1637 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1638 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1639
1640 /* Need space for new headers (invalidates iph ptr) */
1641 err = skb_cow_head(skb, min_headroom);
1642 if (unlikely(err))
1643 return err;
1644
1645 if (vlan_tx_tag_present(skb)) {
1646 if (WARN_ON(!__vlan_put_tag(skb,
1647 skb->vlan_proto,
1648 vlan_tx_tag_get(skb))))
1649 return -ENOMEM;
1650
1651 skb->vlan_tci = 0;
1652 }
1653
1654 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1655 vxh->vx_flags = htonl(VXLAN_FLAGS);
1656 vxh->vx_vni = vni;
1657
1658 __skb_push(skb, sizeof(*uh));
1659 skb_reset_transport_header(skb);
1660 uh = udp_hdr(skb);
1661
1662 uh->dest = dst_port;
1663 uh->source = src_port;
1664
1665 uh->len = htons(skb->len);
1666 uh->check = 0;
1667
1668 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1669 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1670 IPSKB_REROUTED);
1671 skb_dst_set(skb, dst);
1672
1673 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1674 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1675 skb->ip_summed = CHECKSUM_UNNECESSARY;
1676 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1677 IPPROTO_UDP, csum);
1678 if (uh->check == 0)
1679 uh->check = CSUM_MANGLED_0;
1680 } else {
1681 skb->ip_summed = CHECKSUM_PARTIAL;
1682 skb->csum_start = skb_transport_header(skb) - skb->head;
1683 skb->csum_offset = offsetof(struct udphdr, check);
1684 uh->check = ~csum_ipv6_magic(saddr, daddr,
1685 skb->len, IPPROTO_UDP, 0);
1686 }
1687
1688 __skb_push(skb, sizeof(*ip6h));
1689 skb_reset_network_header(skb);
1690 ip6h = ipv6_hdr(skb);
1691 ip6h->version = 6;
1692 ip6h->priority = prio;
1693 ip6h->flow_lbl[0] = 0;
1694 ip6h->flow_lbl[1] = 0;
1695 ip6h->flow_lbl[2] = 0;
1696 ip6h->payload_len = htons(skb->len);
1697 ip6h->nexthdr = IPPROTO_UDP;
1698 ip6h->hop_limit = ttl;
1699 ip6h->daddr = *daddr;
1700 ip6h->saddr = *saddr;
1701
1702 err = handle_offloads(skb);
1703 if (err)
1704 return err;
1705
1706 ip6tunnel_xmit(skb, dev);
1707 return 0;
1708}
1709#endif
1710
1711int vxlan_xmit_skb(struct vxlan_sock *vs,
1712 struct rtable *rt, struct sk_buff *skb,
1713 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1714 __be16 src_port, __be16 dst_port, __be32 vni)
1715{
1716 struct vxlanhdr *vxh;
1717 struct udphdr *uh;
1718 int min_headroom;
1719 int err;
1720
1721 if (!skb->encapsulation) {
1722 skb_reset_inner_headers(skb);
1723 skb->encapsulation = 1;
1724 }
1725
1726 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1727 + VXLAN_HLEN + sizeof(struct iphdr)
1728 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1729
1730 /* Need space for new headers (invalidates iph ptr) */
1731 err = skb_cow_head(skb, min_headroom);
1732 if (unlikely(err))
1733 return err;
1734
1735 if (vlan_tx_tag_present(skb)) {
1736 if (WARN_ON(!__vlan_put_tag(skb,
1737 skb->vlan_proto,
1738 vlan_tx_tag_get(skb))))
1739 return -ENOMEM;
1740
1741 skb->vlan_tci = 0;
1742 }
1743
1744 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1745 vxh->vx_flags = htonl(VXLAN_FLAGS);
1746 vxh->vx_vni = vni;
1747
1748 __skb_push(skb, sizeof(*uh));
1749 skb_reset_transport_header(skb);
1750 uh = udp_hdr(skb);
1751
1752 uh->dest = dst_port;
1753 uh->source = src_port;
1754
1755 uh->len = htons(skb->len);
1756 uh->check = 0;
1757
1758 err = handle_offloads(skb);
1759 if (err)
1760 return err;
1761
1762 return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
1763 tos, ttl, df, false);
1764}
1765EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1766
1767/* Bypass encapsulation if the destination is local */
1768static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1769 struct vxlan_dev *dst_vxlan)
1770{
1771 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1772 union vxlan_addr loopback;
1773 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1774
1775 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1776 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1777 skb->pkt_type = PACKET_HOST;
1778 skb->encapsulation = 0;
1779 skb->dev = dst_vxlan->dev;
1780 __skb_pull(skb, skb_network_offset(skb));
1781
1782 if (remote_ip->sa.sa_family == AF_INET) {
1783 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1784 loopback.sa.sa_family = AF_INET;
1785#if IS_ENABLED(CONFIG_IPV6)
1786 } else {
1787 loopback.sin6.sin6_addr = in6addr_loopback;
1788 loopback.sa.sa_family = AF_INET6;
1789#endif
1790 }
1791
1792 if (dst_vxlan->flags & VXLAN_F_LEARN)
1793 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1794
1795 u64_stats_update_begin(&tx_stats->syncp);
1796 tx_stats->tx_packets++;
1797 tx_stats->tx_bytes += skb->len;
1798 u64_stats_update_end(&tx_stats->syncp);
1799
1800 if (netif_rx(skb) == NET_RX_SUCCESS) {
1801 u64_stats_update_begin(&rx_stats->syncp);
1802 rx_stats->rx_packets++;
1803 rx_stats->rx_bytes += skb->len;
1804 u64_stats_update_end(&rx_stats->syncp);
1805 } else {
1806 skb->dev->stats.rx_dropped++;
1807 }
1808}
1809
1810static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1811 struct vxlan_rdst *rdst, bool did_rsc)
1812{
1813 struct vxlan_dev *vxlan = netdev_priv(dev);
1814 struct rtable *rt = NULL;
1815 const struct iphdr *old_iph;
1816 struct flowi4 fl4;
1817 union vxlan_addr *dst;
1818 __be16 src_port = 0, dst_port;
1819 u32 vni;
1820 __be16 df = 0;
1821 __u8 tos, ttl;
1822 int err;
1823
1824 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1825 vni = rdst->remote_vni;
1826 dst = &rdst->remote_ip;
1827
1828 if (vxlan_addr_any(dst)) {
1829 if (did_rsc) {
1830 /* short-circuited back to local bridge */
1831 vxlan_encap_bypass(skb, vxlan, vxlan);
1832 return;
1833 }
1834 goto drop;
1835 }
1836
1837 old_iph = ip_hdr(skb);
1838
1839 ttl = vxlan->ttl;
1840 if (!ttl && vxlan_addr_multicast(dst))
1841 ttl = 1;
1842
1843 tos = vxlan->tos;
1844 if (tos == 1)
1845 tos = ip_tunnel_get_dsfield(old_iph, skb);
1846
1847 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1848
1849 if (dst->sa.sa_family == AF_INET) {
1850 memset(&fl4, 0, sizeof(fl4));
1851 fl4.flowi4_oif = rdst->remote_ifindex;
1852 fl4.flowi4_tos = RT_TOS(tos);
1853 fl4.daddr = dst->sin.sin_addr.s_addr;
1854 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1855
1856 rt = ip_route_output_key(dev_net(dev), &fl4);
1857 if (IS_ERR(rt)) {
1858 netdev_dbg(dev, "no route to %pI4\n",
1859 &dst->sin.sin_addr.s_addr);
1860 dev->stats.tx_carrier_errors++;
1861 goto tx_error;
1862 }
1863
1864 if (rt->dst.dev == dev) {
1865 netdev_dbg(dev, "circular route to %pI4\n",
1866 &dst->sin.sin_addr.s_addr);
1867 dev->stats.collisions++;
1868 goto rt_tx_error;
1869 }
1870
1871 /* Bypass encapsulation if the destination is local */
1872 if (rt->rt_flags & RTCF_LOCAL &&
1873 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1874 struct vxlan_dev *dst_vxlan;
1875
1876 ip_rt_put(rt);
1877 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1878 if (!dst_vxlan)
1879 goto tx_error;
1880 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1881 return;
1882 }
1883
1884 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1885 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1886
1887 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1888 fl4.saddr, dst->sin.sin_addr.s_addr,
1889 tos, ttl, df, src_port, dst_port,
1890 htonl(vni << 8));
1891
1892 if (err < 0)
1893 goto rt_tx_error;
1894 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1895#if IS_ENABLED(CONFIG_IPV6)
1896 } else {
1897 struct sock *sk = vxlan->vn_sock->sock->sk;
1898 struct dst_entry *ndst;
1899 struct flowi6 fl6;
1900 u32 flags;
1901
1902 memset(&fl6, 0, sizeof(fl6));
1903 fl6.flowi6_oif = rdst->remote_ifindex;
1904 fl6.daddr = dst->sin6.sin6_addr;
1905 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1906 fl6.flowi6_proto = IPPROTO_UDP;
1907
1908 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1909 netdev_dbg(dev, "no route to %pI6\n",
1910 &dst->sin6.sin6_addr);
1911 dev->stats.tx_carrier_errors++;
1912 goto tx_error;
1913 }
1914
1915 if (ndst->dev == dev) {
1916 netdev_dbg(dev, "circular route to %pI6\n",
1917 &dst->sin6.sin6_addr);
1918 dst_release(ndst);
1919 dev->stats.collisions++;
1920 goto tx_error;
1921 }
1922
1923 /* Bypass encapsulation if the destination is local */
1924 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1925 if (flags & RTF_LOCAL &&
1926 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1927 struct vxlan_dev *dst_vxlan;
1928
1929 dst_release(ndst);
1930 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1931 if (!dst_vxlan)
1932 goto tx_error;
1933 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1934 return;
1935 }
1936
1937 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1938
1939 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1940 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1941 src_port, dst_port, htonl(vni << 8));
1942#endif
1943 }
1944
1945 return;
1946
1947drop:
1948 dev->stats.tx_dropped++;
1949 goto tx_free;
1950
1951rt_tx_error:
1952 ip_rt_put(rt);
1953tx_error:
1954 dev->stats.tx_errors++;
1955tx_free:
1956 dev_kfree_skb(skb);
1957}
1958
1959/* Transmit local packets over Vxlan
1960 *
1961 * Outer IP header inherits ECN and DF from inner header.
1962 * Outer UDP destination is the VXLAN assigned port.
1963 * source port is based on hash of flow
1964 */
1965static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1966{
1967 struct vxlan_dev *vxlan = netdev_priv(dev);
1968 struct ethhdr *eth;
1969 bool did_rsc = false;
1970 struct vxlan_rdst *rdst, *fdst = NULL;
1971 struct vxlan_fdb *f;
1972
1973 skb_reset_mac_header(skb);
1974 eth = eth_hdr(skb);
1975
1976 if ((vxlan->flags & VXLAN_F_PROXY)) {
1977 if (ntohs(eth->h_proto) == ETH_P_ARP)
1978 return arp_reduce(dev, skb);
1979#if IS_ENABLED(CONFIG_IPV6)
1980 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1981 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1982 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1983 struct nd_msg *msg;
1984
1985 msg = (struct nd_msg *)skb_transport_header(skb);
1986 if (msg->icmph.icmp6_code == 0 &&
1987 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1988 return neigh_reduce(dev, skb);
1989 }
1990#endif
1991 }
1992
1993 f = vxlan_find_mac(vxlan, eth->h_dest);
1994 did_rsc = false;
1995
1996 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1997 (ntohs(eth->h_proto) == ETH_P_IP ||
1998 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1999 did_rsc = route_shortcircuit(dev, skb);
2000 if (did_rsc)
2001 f = vxlan_find_mac(vxlan, eth->h_dest);
2002 }
2003
2004 if (f == NULL) {
2005 f = vxlan_find_mac(vxlan, all_zeros_mac);
2006 if (f == NULL) {
2007 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2008 !is_multicast_ether_addr(eth->h_dest))
2009 vxlan_fdb_miss(vxlan, eth->h_dest);
2010
2011 dev->stats.tx_dropped++;
2012 kfree_skb(skb);
2013 return NETDEV_TX_OK;
2014 }
2015 }
2016
2017 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2018 struct sk_buff *skb1;
2019
2020 if (!fdst) {
2021 fdst = rdst;
2022 continue;
2023 }
2024 skb1 = skb_clone(skb, GFP_ATOMIC);
2025 if (skb1)
2026 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2027 }
2028
2029 if (fdst)
2030 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2031 else
2032 kfree_skb(skb);
2033 return NETDEV_TX_OK;
2034}
2035
2036/* Walk the forwarding table and purge stale entries */
2037static void vxlan_cleanup(unsigned long arg)
2038{
2039 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2040 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2041 unsigned int h;
2042
2043 if (!netif_running(vxlan->dev))
2044 return;
2045
2046 spin_lock_bh(&vxlan->hash_lock);
2047 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2048 struct hlist_node *p, *n;
2049 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2050 struct vxlan_fdb *f
2051 = container_of(p, struct vxlan_fdb, hlist);
2052 unsigned long timeout;
2053
2054 if (f->state & NUD_PERMANENT)
2055 continue;
2056
2057 timeout = f->used + vxlan->age_interval * HZ;
2058 if (time_before_eq(timeout, jiffies)) {
2059 netdev_dbg(vxlan->dev,
2060 "garbage collect %pM\n",
2061 f->eth_addr);
2062 f->state = NUD_STALE;
2063 vxlan_fdb_destroy(vxlan, f);
2064 } else if (time_before(timeout, next_timer))
2065 next_timer = timeout;
2066 }
2067 }
2068 spin_unlock_bh(&vxlan->hash_lock);
2069
2070 mod_timer(&vxlan->age_timer, next_timer);
2071}
2072
2073static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2074{
2075 __u32 vni = vxlan->default_dst.remote_vni;
2076
2077 vxlan->vn_sock = vs;
2078 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2079}
2080
2081/* Setup stats when device is created */
2082static int vxlan_init(struct net_device *dev)
2083{
2084 struct vxlan_dev *vxlan = netdev_priv(dev);
2085 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2086 struct vxlan_sock *vs;
2087
2088 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2089 if (!dev->tstats)
2090 return -ENOMEM;
2091
2092 spin_lock(&vn->sock_lock);
2093 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
2094 if (vs) {
2095 /* If we have a socket with same port already, reuse it */
2096 atomic_inc(&vs->refcnt);
2097 vxlan_vs_add_dev(vs, vxlan);
2098 } else {
2099 /* otherwise make new socket outside of RTNL */
2100 dev_hold(dev);
2101 queue_work(vxlan_wq, &vxlan->sock_work);
2102 }
2103 spin_unlock(&vn->sock_lock);
2104
2105 return 0;
2106}
2107
2108static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2109{
2110 struct vxlan_fdb *f;
2111
2112 spin_lock_bh(&vxlan->hash_lock);
2113 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2114 if (f)
2115 vxlan_fdb_destroy(vxlan, f);
2116 spin_unlock_bh(&vxlan->hash_lock);
2117}
2118
2119static void vxlan_uninit(struct net_device *dev)
2120{
2121 struct vxlan_dev *vxlan = netdev_priv(dev);
2122 struct vxlan_sock *vs = vxlan->vn_sock;
2123
2124 vxlan_fdb_delete_default(vxlan);
2125
2126 if (vs)
2127 vxlan_sock_release(vs);
2128 free_percpu(dev->tstats);
2129}
2130
2131/* Start ageing timer and join group when device is brought up */
2132static int vxlan_open(struct net_device *dev)
2133{
2134 struct vxlan_dev *vxlan = netdev_priv(dev);
2135 struct vxlan_sock *vs = vxlan->vn_sock;
2136
2137 /* socket hasn't been created */
2138 if (!vs)
2139 return -ENOTCONN;
2140
2141 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2142 vxlan_sock_hold(vs);
2143 dev_hold(dev);
2144 queue_work(vxlan_wq, &vxlan->igmp_join);
2145 }
2146
2147 if (vxlan->age_interval)
2148 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2149
2150 return 0;
2151}
2152
2153/* Purge the forwarding table */
2154static void vxlan_flush(struct vxlan_dev *vxlan)
2155{
2156 unsigned int h;
2157
2158 spin_lock_bh(&vxlan->hash_lock);
2159 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2160 struct hlist_node *p, *n;
2161 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2162 struct vxlan_fdb *f
2163 = container_of(p, struct vxlan_fdb, hlist);
2164 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2165 if (!is_zero_ether_addr(f->eth_addr))
2166 vxlan_fdb_destroy(vxlan, f);
2167 }
2168 }
2169 spin_unlock_bh(&vxlan->hash_lock);
2170}
2171
2172/* Cleanup timer and forwarding table on shutdown */
2173static int vxlan_stop(struct net_device *dev)
2174{
2175 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2176 struct vxlan_dev *vxlan = netdev_priv(dev);
2177 struct vxlan_sock *vs = vxlan->vn_sock;
2178
2179 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2180 !vxlan_group_used(vn, vxlan)) {
2181 vxlan_sock_hold(vs);
2182 dev_hold(dev);
2183 queue_work(vxlan_wq, &vxlan->igmp_leave);
2184 }
2185
2186 del_timer_sync(&vxlan->age_timer);
2187
2188 vxlan_flush(vxlan);
2189
2190 return 0;
2191}
2192
2193/* Stub, nothing needs to be done. */
2194static void vxlan_set_multicast_list(struct net_device *dev)
2195{
2196}
2197
2198static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2199{
2200 struct vxlan_dev *vxlan = netdev_priv(dev);
2201 struct vxlan_rdst *dst = &vxlan->default_dst;
2202 struct net_device *lowerdev;
2203 int max_mtu;
2204
2205 lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex);
2206 if (lowerdev == NULL)
2207 return eth_change_mtu(dev, new_mtu);
2208
2209 if (dst->remote_ip.sa.sa_family == AF_INET6)
2210 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2211 else
2212 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2213
2214 if (new_mtu < 68 || new_mtu > max_mtu)
2215 return -EINVAL;
2216
2217 dev->mtu = new_mtu;
2218 return 0;
2219}
2220
2221static const struct net_device_ops vxlan_netdev_ops = {
2222 .ndo_init = vxlan_init,
2223 .ndo_uninit = vxlan_uninit,
2224 .ndo_open = vxlan_open,
2225 .ndo_stop = vxlan_stop,
2226 .ndo_start_xmit = vxlan_xmit,
2227 .ndo_get_stats64 = ip_tunnel_get_stats64,
2228 .ndo_set_rx_mode = vxlan_set_multicast_list,
2229 .ndo_change_mtu = vxlan_change_mtu,
2230 .ndo_validate_addr = eth_validate_addr,
2231 .ndo_set_mac_address = eth_mac_addr,
2232 .ndo_fdb_add = vxlan_fdb_add,
2233 .ndo_fdb_del = vxlan_fdb_delete,
2234 .ndo_fdb_dump = vxlan_fdb_dump,
2235};
2236
2237/* Info for udev, that this is a virtual tunnel endpoint */
2238static struct device_type vxlan_type = {
2239 .name = "vxlan",
2240};
2241
2242/* Calls the ndo_add_vxlan_port of the caller in order to
2243 * supply the listening VXLAN udp ports. Callers are expected
2244 * to implement the ndo_add_vxlan_port.
2245 */
2246void vxlan_get_rx_port(struct net_device *dev)
2247{
2248 struct vxlan_sock *vs;
2249 struct net *net = dev_net(dev);
2250 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2251 sa_family_t sa_family;
2252 __be16 port;
2253 unsigned int i;
2254
2255 spin_lock(&vn->sock_lock);
2256 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2257 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2258 port = inet_sk(vs->sock->sk)->inet_sport;
2259 sa_family = vs->sock->sk->sk_family;
2260 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2261 port);
2262 }
2263 }
2264 spin_unlock(&vn->sock_lock);
2265}
2266EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2267
2268/* Initialize the device structure. */
2269static void vxlan_setup(struct net_device *dev)
2270{
2271 struct vxlan_dev *vxlan = netdev_priv(dev);
2272 unsigned int h;
2273 int low, high;
2274
2275 eth_hw_addr_random(dev);
2276 ether_setup(dev);
2277 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2278 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2279 else
2280 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2281
2282 dev->netdev_ops = &vxlan_netdev_ops;
2283 dev->destructor = free_netdev;
2284 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2285
2286 dev->tx_queue_len = 0;
2287 dev->features |= NETIF_F_LLTX;
2288 dev->features |= NETIF_F_NETNS_LOCAL;
2289 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2290 dev->features |= NETIF_F_RXCSUM;
2291 dev->features |= NETIF_F_GSO_SOFTWARE;
2292
2293 dev->vlan_features = dev->features;
2294 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2295 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2296 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2297 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2298 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2299 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2300
2301 INIT_LIST_HEAD(&vxlan->next);
2302 spin_lock_init(&vxlan->hash_lock);
2303 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2304 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2305 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2306
2307 init_timer_deferrable(&vxlan->age_timer);
2308 vxlan->age_timer.function = vxlan_cleanup;
2309 vxlan->age_timer.data = (unsigned long) vxlan;
2310
2311 inet_get_local_port_range(dev_net(dev), &low, &high);
2312 vxlan->port_min = low;
2313 vxlan->port_max = high;
2314 vxlan->dst_port = htons(vxlan_port);
2315
2316 vxlan->dev = dev;
2317
2318 for (h = 0; h < FDB_HASH_SIZE; ++h)
2319 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2320}
2321
2322static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2323 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2324 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2325 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2326 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2327 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2328 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2329 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2330 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2331 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2332 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2333 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2334 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2335 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2336 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2337 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2338 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2339 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2340};
2341
2342static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2343{
2344 if (tb[IFLA_ADDRESS]) {
2345 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2346 pr_debug("invalid link address (not ethernet)\n");
2347 return -EINVAL;
2348 }
2349
2350 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2351 pr_debug("invalid all zero ethernet address\n");
2352 return -EADDRNOTAVAIL;
2353 }
2354 }
2355
2356 if (!data)
2357 return -EINVAL;
2358
2359 if (data[IFLA_VXLAN_ID]) {
2360 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2361 if (id >= VXLAN_VID_MASK)
2362 return -ERANGE;
2363 }
2364
2365 if (data[IFLA_VXLAN_PORT_RANGE]) {
2366 const struct ifla_vxlan_port_range *p
2367 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2368
2369 if (ntohs(p->high) < ntohs(p->low)) {
2370 pr_debug("port range %u .. %u not valid\n",
2371 ntohs(p->low), ntohs(p->high));
2372 return -EINVAL;
2373 }
2374 }
2375
2376 return 0;
2377}
2378
2379static void vxlan_get_drvinfo(struct net_device *netdev,
2380 struct ethtool_drvinfo *drvinfo)
2381{
2382 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2383 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2384}
2385
2386static const struct ethtool_ops vxlan_ethtool_ops = {
2387 .get_drvinfo = vxlan_get_drvinfo,
2388 .get_link = ethtool_op_get_link,
2389};
2390
2391static void vxlan_del_work(struct work_struct *work)
2392{
2393 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2394
2395 sk_release_kernel(vs->sock->sk);
2396 kfree_rcu(vs, rcu);
2397}
2398
2399#if IS_ENABLED(CONFIG_IPV6)
2400/* Create UDP socket for encapsulation receive. AF_INET6 socket
2401 * could be used for both IPv4 and IPv6 communications, but
2402 * users may set bindv6only=1.
2403 */
2404static struct socket *create_v6_sock(struct net *net, __be16 port)
2405{
2406 struct sock *sk;
2407 struct socket *sock;
2408 struct sockaddr_in6 vxlan_addr = {
2409 .sin6_family = AF_INET6,
2410 .sin6_port = port,
2411 };
2412 int rc, val = 1;
2413
2414 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2415 if (rc < 0) {
2416 pr_debug("UDPv6 socket create failed\n");
2417 return ERR_PTR(rc);
2418 }
2419
2420 /* Put in proper namespace */
2421 sk = sock->sk;
2422 sk_change_net(sk, net);
2423
2424 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2425 (char *)&val, sizeof(val));
2426 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2427 sizeof(struct sockaddr_in6));
2428 if (rc < 0) {
2429 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2430 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2431 sk_release_kernel(sk);
2432 return ERR_PTR(rc);
2433 }
2434 /* At this point, IPv6 module should have been loaded in
2435 * sock_create_kern().
2436 */
2437 BUG_ON(!ipv6_stub);
2438
2439 /* Disable multicast loopback */
2440 inet_sk(sk)->mc_loop = 0;
2441 return sock;
2442}
2443
2444#else
2445
2446static struct socket *create_v6_sock(struct net *net, __be16 port)
2447{
2448 return ERR_PTR(-EPFNOSUPPORT);
2449}
2450#endif
2451
2452static struct socket *create_v4_sock(struct net *net, __be16 port)
2453{
2454 struct sock *sk;
2455 struct socket *sock;
2456 struct sockaddr_in vxlan_addr = {
2457 .sin_family = AF_INET,
2458 .sin_addr.s_addr = htonl(INADDR_ANY),
2459 .sin_port = port,
2460 };
2461 int rc;
2462
2463 /* Create UDP socket for encapsulation receive. */
2464 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2465 if (rc < 0) {
2466 pr_debug("UDP socket create failed\n");
2467 return ERR_PTR(rc);
2468 }
2469
2470 /* Put in proper namespace */
2471 sk = sock->sk;
2472 sk_change_net(sk, net);
2473
2474 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2475 sizeof(vxlan_addr));
2476 if (rc < 0) {
2477 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2478 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2479 sk_release_kernel(sk);
2480 return ERR_PTR(rc);
2481 }
2482
2483 /* Disable multicast loopback */
2484 inet_sk(sk)->mc_loop = 0;
2485 return sock;
2486}
2487
2488/* Create new listen socket if needed */
2489static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2490 vxlan_rcv_t *rcv, void *data, bool ipv6)
2491{
2492 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2493 struct vxlan_sock *vs;
2494 struct socket *sock;
2495 struct sock *sk;
2496 unsigned int h;
2497
2498 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2499 if (!vs)
2500 return ERR_PTR(-ENOMEM);
2501
2502 for (h = 0; h < VNI_HASH_SIZE; ++h)
2503 INIT_HLIST_HEAD(&vs->vni_list[h]);
2504
2505 INIT_WORK(&vs->del_work, vxlan_del_work);
2506
2507 if (ipv6)
2508 sock = create_v6_sock(net, port);
2509 else
2510 sock = create_v4_sock(net, port);
2511 if (IS_ERR(sock)) {
2512 kfree(vs);
2513 return ERR_CAST(sock);
2514 }
2515
2516 vs->sock = sock;
2517 sk = sock->sk;
2518 atomic_set(&vs->refcnt, 1);
2519 vs->rcv = rcv;
2520 vs->data = data;
2521 rcu_assign_sk_user_data(vs->sock->sk, vs);
2522
2523 /* Initialize the vxlan udp offloads structure */
2524 vs->udp_offloads.port = port;
2525 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2526 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2527
2528 spin_lock(&vn->sock_lock);
2529 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2530 vxlan_notify_add_rx_port(vs);
2531 spin_unlock(&vn->sock_lock);
2532
2533 /* Mark socket as an encapsulation socket. */
2534 udp_sk(sk)->encap_type = 1;
2535 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2536#if IS_ENABLED(CONFIG_IPV6)
2537 if (ipv6)
2538 ipv6_stub->udpv6_encap_enable();
2539 else
2540#endif
2541 udp_encap_enable();
2542
2543 return vs;
2544}
2545
2546struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2547 vxlan_rcv_t *rcv, void *data,
2548 bool no_share, bool ipv6)
2549{
2550 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2551 struct vxlan_sock *vs;
2552
2553 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2554 if (!IS_ERR(vs))
2555 return vs;
2556
2557 if (no_share) /* Return error if sharing is not allowed. */
2558 return vs;
2559
2560 spin_lock(&vn->sock_lock);
2561 vs = vxlan_find_sock(net, port);
2562 if (vs) {
2563 if (vs->rcv == rcv)
2564 atomic_inc(&vs->refcnt);
2565 else
2566 vs = ERR_PTR(-EBUSY);
2567 }
2568 spin_unlock(&vn->sock_lock);
2569
2570 if (!vs)
2571 vs = ERR_PTR(-EINVAL);
2572
2573 return vs;
2574}
2575EXPORT_SYMBOL_GPL(vxlan_sock_add);
2576
2577/* Scheduled at device creation to bind to a socket */
2578static void vxlan_sock_work(struct work_struct *work)
2579{
2580 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2581 struct net *net = dev_net(vxlan->dev);
2582 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2583 __be16 port = vxlan->dst_port;
2584 struct vxlan_sock *nvs;
2585
2586 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2587 spin_lock(&vn->sock_lock);
2588 if (!IS_ERR(nvs))
2589 vxlan_vs_add_dev(nvs, vxlan);
2590 spin_unlock(&vn->sock_lock);
2591
2592 dev_put(vxlan->dev);
2593}
2594
2595static int vxlan_newlink(struct net *net, struct net_device *dev,
2596 struct nlattr *tb[], struct nlattr *data[])
2597{
2598 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2599 struct vxlan_dev *vxlan = netdev_priv(dev);
2600 struct vxlan_rdst *dst = &vxlan->default_dst;
2601 __u32 vni;
2602 int err;
2603 bool use_ipv6 = false;
2604
2605 if (!data[IFLA_VXLAN_ID])
2606 return -EINVAL;
2607
2608 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2609 dst->remote_vni = vni;
2610
2611 /* Unless IPv6 is explicitly requested, assume IPv4 */
2612 dst->remote_ip.sa.sa_family = AF_INET;
2613 if (data[IFLA_VXLAN_GROUP]) {
2614 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2615 } else if (data[IFLA_VXLAN_GROUP6]) {
2616 if (!IS_ENABLED(CONFIG_IPV6))
2617 return -EPFNOSUPPORT;
2618
2619 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2620 sizeof(struct in6_addr));
2621 dst->remote_ip.sa.sa_family = AF_INET6;
2622 use_ipv6 = true;
2623 }
2624
2625 if (data[IFLA_VXLAN_LOCAL]) {
2626 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2627 vxlan->saddr.sa.sa_family = AF_INET;
2628 } else if (data[IFLA_VXLAN_LOCAL6]) {
2629 if (!IS_ENABLED(CONFIG_IPV6))
2630 return -EPFNOSUPPORT;
2631
2632 /* TODO: respect scope id */
2633 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2634 sizeof(struct in6_addr));
2635 vxlan->saddr.sa.sa_family = AF_INET6;
2636 use_ipv6 = true;
2637 }
2638
2639 if (data[IFLA_VXLAN_LINK] &&
2640 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2641 struct net_device *lowerdev
2642 = __dev_get_by_index(net, dst->remote_ifindex);
2643
2644 if (!lowerdev) {
2645 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2646 return -ENODEV;
2647 }
2648
2649#if IS_ENABLED(CONFIG_IPV6)
2650 if (use_ipv6) {
2651 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2652 if (idev && idev->cnf.disable_ipv6) {
2653 pr_info("IPv6 is disabled via sysctl\n");
2654 return -EPERM;
2655 }
2656 vxlan->flags |= VXLAN_F_IPV6;
2657 }
2658#endif
2659
2660 if (!tb[IFLA_MTU])
2661 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2662
2663 /* update header length based on lower device */
2664 dev->hard_header_len = lowerdev->hard_header_len +
2665 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2666 } else if (use_ipv6)
2667 vxlan->flags |= VXLAN_F_IPV6;
2668
2669 if (data[IFLA_VXLAN_TOS])
2670 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2671
2672 if (data[IFLA_VXLAN_TTL])
2673 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2674
2675 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2676 vxlan->flags |= VXLAN_F_LEARN;
2677
2678 if (data[IFLA_VXLAN_AGEING])
2679 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2680 else
2681 vxlan->age_interval = FDB_AGE_DEFAULT;
2682
2683 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2684 vxlan->flags |= VXLAN_F_PROXY;
2685
2686 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2687 vxlan->flags |= VXLAN_F_RSC;
2688
2689 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2690 vxlan->flags |= VXLAN_F_L2MISS;
2691
2692 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2693 vxlan->flags |= VXLAN_F_L3MISS;
2694
2695 if (data[IFLA_VXLAN_LIMIT])
2696 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2697
2698 if (data[IFLA_VXLAN_PORT_RANGE]) {
2699 const struct ifla_vxlan_port_range *p
2700 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2701 vxlan->port_min = ntohs(p->low);
2702 vxlan->port_max = ntohs(p->high);
2703 }
2704
2705 if (data[IFLA_VXLAN_PORT])
2706 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2707
2708 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2709 pr_info("duplicate VNI %u\n", vni);
2710 return -EEXIST;
2711 }
2712
2713 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2714
2715 /* create an fdb entry for a valid default destination */
2716 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2717 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2718 &vxlan->default_dst.remote_ip,
2719 NUD_REACHABLE|NUD_PERMANENT,
2720 NLM_F_EXCL|NLM_F_CREATE,
2721 vxlan->dst_port,
2722 vxlan->default_dst.remote_vni,
2723 vxlan->default_dst.remote_ifindex,
2724 NTF_SELF);
2725 if (err)
2726 return err;
2727 }
2728
2729 err = register_netdevice(dev);
2730 if (err) {
2731 vxlan_fdb_delete_default(vxlan);
2732 return err;
2733 }
2734
2735 list_add(&vxlan->next, &vn->vxlan_list);
2736
2737 return 0;
2738}
2739
2740static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2741{
2742 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2743 struct vxlan_dev *vxlan = netdev_priv(dev);
2744
2745 spin_lock(&vn->sock_lock);
2746 if (!hlist_unhashed(&vxlan->hlist))
2747 hlist_del_rcu(&vxlan->hlist);
2748 spin_unlock(&vn->sock_lock);
2749
2750 list_del(&vxlan->next);
2751 unregister_netdevice_queue(dev, head);
2752}
2753
2754static size_t vxlan_get_size(const struct net_device *dev)
2755{
2756
2757 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2758 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2759 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2760 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2761 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2762 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2763 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2764 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2765 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2766 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2767 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2768 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2769 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2770 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2771 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2772 0;
2773}
2774
2775static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2776{
2777 const struct vxlan_dev *vxlan = netdev_priv(dev);
2778 const struct vxlan_rdst *dst = &vxlan->default_dst;
2779 struct ifla_vxlan_port_range ports = {
2780 .low = htons(vxlan->port_min),
2781 .high = htons(vxlan->port_max),
2782 };
2783
2784 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2785 goto nla_put_failure;
2786
2787 if (!vxlan_addr_any(&dst->remote_ip)) {
2788 if (dst->remote_ip.sa.sa_family == AF_INET) {
2789 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2790 dst->remote_ip.sin.sin_addr.s_addr))
2791 goto nla_put_failure;
2792#if IS_ENABLED(CONFIG_IPV6)
2793 } else {
2794 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2795 &dst->remote_ip.sin6.sin6_addr))
2796 goto nla_put_failure;
2797#endif
2798 }
2799 }
2800
2801 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2802 goto nla_put_failure;
2803
2804 if (!vxlan_addr_any(&vxlan->saddr)) {
2805 if (vxlan->saddr.sa.sa_family == AF_INET) {
2806 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2807 vxlan->saddr.sin.sin_addr.s_addr))
2808 goto nla_put_failure;
2809#if IS_ENABLED(CONFIG_IPV6)
2810 } else {
2811 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2812 &vxlan->saddr.sin6.sin6_addr))
2813 goto nla_put_failure;
2814#endif
2815 }
2816 }
2817
2818 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2819 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2820 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2821 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2822 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2823 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2824 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2825 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2826 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2827 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2828 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2829 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2830 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2831 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2832 goto nla_put_failure;
2833
2834 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2835 goto nla_put_failure;
2836
2837 return 0;
2838
2839nla_put_failure:
2840 return -EMSGSIZE;
2841}
2842
2843static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2844 .kind = "vxlan",
2845 .maxtype = IFLA_VXLAN_MAX,
2846 .policy = vxlan_policy,
2847 .priv_size = sizeof(struct vxlan_dev),
2848 .setup = vxlan_setup,
2849 .validate = vxlan_validate,
2850 .newlink = vxlan_newlink,
2851 .dellink = vxlan_dellink,
2852 .get_size = vxlan_get_size,
2853 .fill_info = vxlan_fill_info,
2854};
2855
2856static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2857 struct net_device *dev)
2858{
2859 struct vxlan_dev *vxlan, *next;
2860 LIST_HEAD(list_kill);
2861
2862 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2863 struct vxlan_rdst *dst = &vxlan->default_dst;
2864
2865 /* In case we created vxlan device with carrier
2866 * and we loose the carrier due to module unload
2867 * we also need to remove vxlan device. In other
2868 * cases, it's not necessary and remote_ifindex
2869 * is 0 here, so no matches.
2870 */
2871 if (dst->remote_ifindex == dev->ifindex)
2872 vxlan_dellink(vxlan->dev, &list_kill);
2873 }
2874
2875 unregister_netdevice_many(&list_kill);
2876}
2877
2878static int vxlan_lowerdev_event(struct notifier_block *unused,
2879 unsigned long event, void *ptr)
2880{
2881 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2882 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2883
2884 if (event == NETDEV_UNREGISTER)
2885 vxlan_handle_lowerdev_unregister(vn, dev);
2886
2887 return NOTIFY_DONE;
2888}
2889
2890static struct notifier_block vxlan_notifier_block __read_mostly = {
2891 .notifier_call = vxlan_lowerdev_event,
2892};
2893
2894static __net_init int vxlan_init_net(struct net *net)
2895{
2896 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2897 unsigned int h;
2898
2899 INIT_LIST_HEAD(&vn->vxlan_list);
2900 spin_lock_init(&vn->sock_lock);
2901
2902 for (h = 0; h < PORT_HASH_SIZE; ++h)
2903 INIT_HLIST_HEAD(&vn->sock_list[h]);
2904
2905 return 0;
2906}
2907
2908static struct pernet_operations vxlan_net_ops = {
2909 .init = vxlan_init_net,
2910 .id = &vxlan_net_id,
2911 .size = sizeof(struct vxlan_net),
2912};
2913
2914static int __init vxlan_init_module(void)
2915{
2916 int rc;
2917
2918 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2919 if (!vxlan_wq)
2920 return -ENOMEM;
2921
2922 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2923
2924 rc = register_pernet_subsys(&vxlan_net_ops);
2925 if (rc)
2926 goto out1;
2927
2928 rc = register_netdevice_notifier(&vxlan_notifier_block);
2929 if (rc)
2930 goto out2;
2931
2932 rc = rtnl_link_register(&vxlan_link_ops);
2933 if (rc)
2934 goto out3;
2935
2936 return 0;
2937out3:
2938 unregister_netdevice_notifier(&vxlan_notifier_block);
2939out2:
2940 unregister_pernet_subsys(&vxlan_net_ops);
2941out1:
2942 destroy_workqueue(vxlan_wq);
2943 return rc;
2944}
2945late_initcall(vxlan_init_module);
2946
2947static void __exit vxlan_cleanup_module(void)
2948{
2949 rtnl_link_unregister(&vxlan_link_ops);
2950 unregister_netdevice_notifier(&vxlan_notifier_block);
2951 destroy_workqueue(vxlan_wq);
2952 unregister_pernet_subsys(&vxlan_net_ops);
2953 /* rcu_barrier() is called by netns */
2954}
2955module_exit(vxlan_cleanup_module);
2956
2957MODULE_LICENSE("GPL");
2958MODULE_VERSION(VXLAN_VERSION);
2959MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2960MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2961MODULE_ALIAS_RTNL_LINK("vxlan");