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docs: fix Co-Developed-by docs
[linux/fpc-iii.git] / drivers / net / vxlan.c
blob5209ee9aac47846367d7f469a7e69d08c030087e
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/udp.h>
18 #include <linux/igmp.h>
19 #include <linux/if_ether.h>
20 #include <linux/ethtool.h>
21 #include <net/arp.h>
22 #include <net/ndisc.h>
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/rtnetlink.h>
26 #include <net/inet_ecn.h>
27 #include <net/net_namespace.h>
28 #include <net/netns/generic.h>
29 #include <net/tun_proto.h>
30 #include <net/vxlan.h>
31
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <net/ip6_tunnel.h>
34 #include <net/ip6_checksum.h>
35 #endif
36
37 #define VXLAN_VERSION "0.1"
38
39 #define PORT_HASH_BITS 8
40 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41 #define FDB_AGE_DEFAULT 300 /* 5 min */
42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44 /* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48 static unsigned short vxlan_port __read_mostly = 8472;
49 module_param_named(udp_port, vxlan_port, ushort, 0444);
50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52 static bool log_ecn_error = true;
53 module_param(log_ecn_error, bool, 0644);
54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56 static unsigned int vxlan_net_id;
57 static struct rtnl_link_ops vxlan_link_ops;
58
59 static const u8 all_zeros_mac[ETH_ALEN + 2];
60
61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64
65 /* per-network namespace private data for this module */
66 struct vxlan_net {
67 struct list_head vxlan_list;
68 struct hlist_head sock_list[PORT_HASH_SIZE];
69 spinlock_t sock_lock;
70 };
71
72 /* Forwarding table entry */
73 struct vxlan_fdb {
74 struct hlist_node hlist; /* linked list of entries */
75 struct rcu_head rcu;
76 unsigned long updated; /* jiffies */
77 unsigned long used;
78 struct list_head remotes;
79 u8 eth_addr[ETH_ALEN];
80 u16 state; /* see ndm_state */
81 __be32 vni;
82 u16 flags; /* see ndm_flags and below */
83 };
84
85 #define NTF_VXLAN_ADDED_BY_USER 0x100
86
87 /* salt for hash table */
88 static u32 vxlan_salt __read_mostly;
89
90 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
91 {
92 return vs->flags & VXLAN_F_COLLECT_METADATA ||
93 ip_tunnel_collect_metadata();
94 }
95
96 #if IS_ENABLED(CONFIG_IPV6)
97 static inline
98 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
99 {
100 if (a->sa.sa_family != b->sa.sa_family)
101 return false;
102 if (a->sa.sa_family == AF_INET6)
103 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
104 else
105 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
106 }
107
108 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
109 {
110 if (nla_len(nla) >= sizeof(struct in6_addr)) {
111 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
112 ip->sa.sa_family = AF_INET6;
113 return 0;
114 } else if (nla_len(nla) >= sizeof(__be32)) {
115 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
116 ip->sa.sa_family = AF_INET;
117 return 0;
118 } else {
119 return -EAFNOSUPPORT;
120 }
121 }
122
123 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
124 const union vxlan_addr *ip)
125 {
126 if (ip->sa.sa_family == AF_INET6)
127 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
128 else
129 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
130 }
131
132 #else /* !CONFIG_IPV6 */
133
134 static inline
135 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
136 {
137 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
138 }
139
140 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
141 {
142 if (nla_len(nla) >= sizeof(struct in6_addr)) {
143 return -EAFNOSUPPORT;
144 } else if (nla_len(nla) >= sizeof(__be32)) {
145 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
146 ip->sa.sa_family = AF_INET;
147 return 0;
148 } else {
149 return -EAFNOSUPPORT;
150 }
151 }
152
153 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
154 const union vxlan_addr *ip)
155 {
156 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
157 }
158 #endif
159
160 /* Virtual Network hash table head */
161 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
162 {
163 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
164 }
165
166 /* Socket hash table head */
167 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
168 {
169 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
170
171 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
172 }
173
174 /* First remote destination for a forwarding entry.
175 * Guaranteed to be non-NULL because remotes are never deleted.
176 */
177 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
178 {
179 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
180 }
181
182 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
183 {
184 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
185 }
186
187 /* Find VXLAN socket based on network namespace, address family and UDP port
188 * and enabled unshareable flags.
189 */
190 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
191 __be16 port, u32 flags, int ifindex)
192 {
193 struct vxlan_sock *vs;
194
195 flags &= VXLAN_F_RCV_FLAGS;
196
197 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
198 if (inet_sk(vs->sock->sk)->inet_sport == port &&
199 vxlan_get_sk_family(vs) == family &&
200 vs->flags == flags &&
201 vs->sock->sk->sk_bound_dev_if == ifindex)
202 return vs;
203 }
204 return NULL;
205 }
206
207 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
208 __be32 vni)
209 {
210 struct vxlan_dev_node *node;
211
212 /* For flow based devices, map all packets to VNI 0 */
213 if (vs->flags & VXLAN_F_COLLECT_METADATA)
214 vni = 0;
215
216 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
217 if (node->vxlan->default_dst.remote_vni != vni)
218 continue;
219
220 if (IS_ENABLED(CONFIG_IPV6)) {
221 const struct vxlan_config *cfg = &node->vxlan->cfg;
222
223 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
224 cfg->remote_ifindex != ifindex)
225 continue;
226 }
227
228 return node->vxlan;
229 }
230
231 return NULL;
232 }
233
234 /* Look up VNI in a per net namespace table */
235 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
236 __be32 vni, sa_family_t family,
237 __be16 port, u32 flags)
238 {
239 struct vxlan_sock *vs;
240
241 vs = vxlan_find_sock(net, family, port, flags, ifindex);
242 if (!vs)
243 return NULL;
244
245 return vxlan_vs_find_vni(vs, ifindex, vni);
246 }
247
248 /* Fill in neighbour message in skbuff. */
249 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
250 const struct vxlan_fdb *fdb,
251 u32 portid, u32 seq, int type, unsigned int flags,
252 const struct vxlan_rdst *rdst)
253 {
254 unsigned long now = jiffies;
255 struct nda_cacheinfo ci;
256 struct nlmsghdr *nlh;
257 struct ndmsg *ndm;
258 bool send_ip, send_eth;
259
260 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
261 if (nlh == NULL)
262 return -EMSGSIZE;
263
264 ndm = nlmsg_data(nlh);
265 memset(ndm, 0, sizeof(*ndm));
266
267 send_eth = send_ip = true;
268
269 if (type == RTM_GETNEIGH) {
270 send_ip = !vxlan_addr_any(&rdst->remote_ip);
271 send_eth = !is_zero_ether_addr(fdb->eth_addr);
272 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
273 } else
274 ndm->ndm_family = AF_BRIDGE;
275 ndm->ndm_state = fdb->state;
276 ndm->ndm_ifindex = vxlan->dev->ifindex;
277 ndm->ndm_flags = fdb->flags;
278 if (rdst->offloaded)
279 ndm->ndm_flags |= NTF_OFFLOADED;
280 ndm->ndm_type = RTN_UNICAST;
281
282 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
283 nla_put_s32(skb, NDA_LINK_NETNSID,
284 peernet2id(dev_net(vxlan->dev), vxlan->net)))
285 goto nla_put_failure;
286
287 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
288 goto nla_put_failure;
289
290 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
291 goto nla_put_failure;
292
293 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
294 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
295 goto nla_put_failure;
296 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
297 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
298 goto nla_put_failure;
299 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
300 nla_put_u32(skb, NDA_SRC_VNI,
301 be32_to_cpu(fdb->vni)))
302 goto nla_put_failure;
303 if (rdst->remote_ifindex &&
304 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
305 goto nla_put_failure;
306
307 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
308 ci.ndm_confirmed = 0;
309 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
310 ci.ndm_refcnt = 0;
311
312 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
313 goto nla_put_failure;
314
315 nlmsg_end(skb, nlh);
316 return 0;
317
318 nla_put_failure:
319 nlmsg_cancel(skb, nlh);
320 return -EMSGSIZE;
321 }
322
323 static inline size_t vxlan_nlmsg_size(void)
324 {
325 return NLMSG_ALIGN(sizeof(struct ndmsg))
326 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
327 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
328 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
329 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
330 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
331 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
332 + nla_total_size(sizeof(struct nda_cacheinfo));
333 }
334
335 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
336 struct vxlan_rdst *rd, int type)
337 {
338 struct net *net = dev_net(vxlan->dev);
339 struct sk_buff *skb;
340 int err = -ENOBUFS;
341
342 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
343 if (skb == NULL)
344 goto errout;
345
346 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
347 if (err < 0) {
348 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
349 WARN_ON(err == -EMSGSIZE);
350 kfree_skb(skb);
351 goto errout;
352 }
353
354 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
355 return;
356 errout:
357 if (err < 0)
358 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
359 }
360
361 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
362 const struct vxlan_fdb *fdb,
363 const struct vxlan_rdst *rd,
364 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
365 {
366 fdb_info->info.dev = vxlan->dev;
367 fdb_info->info.extack = NULL;
368 fdb_info->remote_ip = rd->remote_ip;
369 fdb_info->remote_port = rd->remote_port;
370 fdb_info->remote_vni = rd->remote_vni;
371 fdb_info->remote_ifindex = rd->remote_ifindex;
372 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
373 fdb_info->vni = fdb->vni;
374 fdb_info->offloaded = rd->offloaded;
375 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
376 }
377
378 static void vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
379 struct vxlan_fdb *fdb,
380 struct vxlan_rdst *rd,
381 bool adding)
382 {
383 struct switchdev_notifier_vxlan_fdb_info info;
384 enum switchdev_notifier_type notifier_type;
385
386 if (WARN_ON(!rd))
387 return;
388
389 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
390 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
391 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, &info);
392 call_switchdev_notifiers(notifier_type, vxlan->dev,
393 &info.info);
394 }
395
396 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
397 struct vxlan_rdst *rd, int type, bool swdev_notify)
398 {
399 if (swdev_notify) {
400 switch (type) {
401 case RTM_NEWNEIGH:
402 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
403 true);
404 break;
405 case RTM_DELNEIGH:
406 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
407 false);
408 break;
409 }
410 }
411
412 __vxlan_fdb_notify(vxlan, fdb, rd, type);
413 }
414
415 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
416 {
417 struct vxlan_dev *vxlan = netdev_priv(dev);
418 struct vxlan_fdb f = {
419 .state = NUD_STALE,
420 };
421 struct vxlan_rdst remote = {
422 .remote_ip = *ipa, /* goes to NDA_DST */
423 .remote_vni = cpu_to_be32(VXLAN_N_VID),
424 };
425
426 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true);
427 }
428
429 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
430 {
431 struct vxlan_fdb f = {
432 .state = NUD_STALE,
433 };
434 struct vxlan_rdst remote = { };
435
436 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
437
438 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true);
439 }
440
441 /* Hash Ethernet address */
442 static u32 eth_hash(const unsigned char *addr)
443 {
444 u64 value = get_unaligned((u64 *)addr);
445
446 /* only want 6 bytes */
447 #ifdef __BIG_ENDIAN
448 value >>= 16;
449 #else
450 value <<= 16;
451 #endif
452 return hash_64(value, FDB_HASH_BITS);
453 }
454
455 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
456 {
457 /* use 1 byte of OUI and 3 bytes of NIC */
458 u32 key = get_unaligned((u32 *)(addr + 2));
459
460 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
461 }
462
463 /* Hash chain to use given mac address */
464 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
465 const u8 *mac, __be32 vni)
466 {
467 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
468 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
469 else
470 return &vxlan->fdb_head[eth_hash(mac)];
471 }
472
473 /* Look up Ethernet address in forwarding table */
474 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
475 const u8 *mac, __be32 vni)
476 {
477 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
478 struct vxlan_fdb *f;
479
480 hlist_for_each_entry_rcu(f, head, hlist) {
481 if (ether_addr_equal(mac, f->eth_addr)) {
482 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
483 if (vni == f->vni)
484 return f;
485 } else {
486 return f;
487 }
488 }
489 }
490
491 return NULL;
492 }
493
494 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
495 const u8 *mac, __be32 vni)
496 {
497 struct vxlan_fdb *f;
498
499 f = __vxlan_find_mac(vxlan, mac, vni);
500 if (f && f->used != jiffies)
501 f->used = jiffies;
502
503 return f;
504 }
505
506 /* caller should hold vxlan->hash_lock */
507 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
508 union vxlan_addr *ip, __be16 port,
509 __be32 vni, __u32 ifindex)
510 {
511 struct vxlan_rdst *rd;
512
513 list_for_each_entry(rd, &f->remotes, list) {
514 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
515 rd->remote_port == port &&
516 rd->remote_vni == vni &&
517 rd->remote_ifindex == ifindex)
518 return rd;
519 }
520
521 return NULL;
522 }
523
524 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
525 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
526 {
527 struct vxlan_dev *vxlan = netdev_priv(dev);
528 u8 eth_addr[ETH_ALEN + 2] = { 0 };
529 struct vxlan_rdst *rdst;
530 struct vxlan_fdb *f;
531 int rc = 0;
532
533 if (is_multicast_ether_addr(mac) ||
534 is_zero_ether_addr(mac))
535 return -EINVAL;
536
537 ether_addr_copy(eth_addr, mac);
538
539 rcu_read_lock();
540
541 f = __vxlan_find_mac(vxlan, eth_addr, vni);
542 if (!f) {
543 rc = -ENOENT;
544 goto out;
545 }
546
547 rdst = first_remote_rcu(f);
548 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, fdb_info);
549
550 out:
551 rcu_read_unlock();
552 return rc;
553 }
554 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
555
556 static int vxlan_fdb_notify_one(struct notifier_block *nb,
557 const struct vxlan_dev *vxlan,
558 const struct vxlan_fdb *f,
559 const struct vxlan_rdst *rdst)
560 {
561 struct switchdev_notifier_vxlan_fdb_info fdb_info;
562 int rc;
563
564 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, &fdb_info);
565 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
566 &fdb_info);
567 return notifier_to_errno(rc);
568 }
569
570 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
571 struct notifier_block *nb)
572 {
573 struct vxlan_dev *vxlan;
574 struct vxlan_rdst *rdst;
575 struct vxlan_fdb *f;
576 unsigned int h;
577 int rc = 0;
578
579 if (!netif_is_vxlan(dev))
580 return -EINVAL;
581 vxlan = netdev_priv(dev);
582
583 spin_lock_bh(&vxlan->hash_lock);
584 for (h = 0; h < FDB_HASH_SIZE; ++h) {
585 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
586 if (f->vni == vni) {
587 list_for_each_entry(rdst, &f->remotes, list) {
588 rc = vxlan_fdb_notify_one(nb, vxlan,
589 f, rdst);
590 if (rc)
591 goto out;
592 }
593 }
594 }
595 }
596
597 out:
598 spin_unlock_bh(&vxlan->hash_lock);
599 return rc;
600 }
601 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
602
603 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
604 {
605 struct vxlan_dev *vxlan;
606 struct vxlan_rdst *rdst;
607 struct vxlan_fdb *f;
608 unsigned int h;
609
610 if (!netif_is_vxlan(dev))
611 return;
612 vxlan = netdev_priv(dev);
613
614 spin_lock_bh(&vxlan->hash_lock);
615 for (h = 0; h < FDB_HASH_SIZE; ++h) {
616 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
617 if (f->vni == vni)
618 list_for_each_entry(rdst, &f->remotes, list)
619 rdst->offloaded = false;
620 }
621 spin_unlock_bh(&vxlan->hash_lock);
622 }
623 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
624
625 /* Replace destination of unicast mac */
626 static int vxlan_fdb_replace(struct vxlan_fdb *f,
627 union vxlan_addr *ip, __be16 port, __be32 vni,
628 __u32 ifindex)
629 {
630 struct vxlan_rdst *rd;
631
632 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
633 if (rd)
634 return 0;
635
636 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
637 if (!rd)
638 return 0;
639
640 dst_cache_reset(&rd->dst_cache);
641 rd->remote_ip = *ip;
642 rd->remote_port = port;
643 rd->remote_vni = vni;
644 rd->remote_ifindex = ifindex;
645 rd->offloaded = false;
646 return 1;
647 }
648
649 /* Add/update destinations for multicast */
650 static int vxlan_fdb_append(struct vxlan_fdb *f,
651 union vxlan_addr *ip, __be16 port, __be32 vni,
652 __u32 ifindex, struct vxlan_rdst **rdp)
653 {
654 struct vxlan_rdst *rd;
655
656 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
657 if (rd)
658 return 0;
659
660 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
661 if (rd == NULL)
662 return -ENOBUFS;
663
664 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
665 kfree(rd);
666 return -ENOBUFS;
667 }
668
669 rd->remote_ip = *ip;
670 rd->remote_port = port;
671 rd->offloaded = false;
672 rd->remote_vni = vni;
673 rd->remote_ifindex = ifindex;
674
675 list_add_tail_rcu(&rd->list, &f->remotes);
676
677 *rdp = rd;
678 return 1;
679 }
680
681 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
682 unsigned int off,
683 struct vxlanhdr *vh, size_t hdrlen,
684 __be32 vni_field,
685 struct gro_remcsum *grc,
686 bool nopartial)
687 {
688 size_t start, offset;
689
690 if (skb->remcsum_offload)
691 return vh;
692
693 if (!NAPI_GRO_CB(skb)->csum_valid)
694 return NULL;
695
696 start = vxlan_rco_start(vni_field);
697 offset = start + vxlan_rco_offset(vni_field);
698
699 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
700 start, offset, grc, nopartial);
701
702 skb->remcsum_offload = 1;
703
704 return vh;
705 }
706
707 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
708 struct list_head *head,
709 struct sk_buff *skb)
710 {
711 struct sk_buff *pp = NULL;
712 struct sk_buff *p;
713 struct vxlanhdr *vh, *vh2;
714 unsigned int hlen, off_vx;
715 int flush = 1;
716 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
717 __be32 flags;
718 struct gro_remcsum grc;
719
720 skb_gro_remcsum_init(&grc);
721
722 off_vx = skb_gro_offset(skb);
723 hlen = off_vx + sizeof(*vh);
724 vh = skb_gro_header_fast(skb, off_vx);
725 if (skb_gro_header_hard(skb, hlen)) {
726 vh = skb_gro_header_slow(skb, hlen, off_vx);
727 if (unlikely(!vh))
728 goto out;
729 }
730
731 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
732
733 flags = vh->vx_flags;
734
735 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
736 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
737 vh->vx_vni, &grc,
738 !!(vs->flags &
739 VXLAN_F_REMCSUM_NOPARTIAL));
740
741 if (!vh)
742 goto out;
743 }
744
745 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
746
747 list_for_each_entry(p, head, list) {
748 if (!NAPI_GRO_CB(p)->same_flow)
749 continue;
750
751 vh2 = (struct vxlanhdr *)(p->data + off_vx);
752 if (vh->vx_flags != vh2->vx_flags ||
753 vh->vx_vni != vh2->vx_vni) {
754 NAPI_GRO_CB(p)->same_flow = 0;
755 continue;
756 }
757 }
758
759 pp = call_gro_receive(eth_gro_receive, head, skb);
760 flush = 0;
761
762 out:
763 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
764
765 return pp;
766 }
767
768 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
769 {
770 /* Sets 'skb->inner_mac_header' since we are always called with
771 * 'skb->encapsulation' set.
772 */
773 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
774 }
775
776 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
777 const u8 *mac, __u16 state,
778 __be32 src_vni, __u16 ndm_flags)
779 {
780 struct vxlan_fdb *f;
781
782 f = kmalloc(sizeof(*f), GFP_ATOMIC);
783 if (!f)
784 return NULL;
785 f->state = state;
786 f->flags = ndm_flags;
787 f->updated = f->used = jiffies;
788 f->vni = src_vni;
789 INIT_LIST_HEAD(&f->remotes);
790 memcpy(f->eth_addr, mac, ETH_ALEN);
791
792 return f;
793 }
794
795 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
796 const u8 *mac, union vxlan_addr *ip,
797 __u16 state, __be16 port, __be32 src_vni,
798 __be32 vni, __u32 ifindex, __u16 ndm_flags,
799 struct vxlan_fdb **fdb)
800 {
801 struct vxlan_rdst *rd = NULL;
802 struct vxlan_fdb *f;
803 int rc;
804
805 if (vxlan->cfg.addrmax &&
806 vxlan->addrcnt >= vxlan->cfg.addrmax)
807 return -ENOSPC;
808
809 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
810 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
811 if (!f)
812 return -ENOMEM;
813
814 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
815 if (rc < 0) {
816 kfree(f);
817 return rc;
818 }
819
820 ++vxlan->addrcnt;
821 hlist_add_head_rcu(&f->hlist,
822 vxlan_fdb_head(vxlan, mac, src_vni));
823
824 *fdb = f;
825
826 return 0;
827 }
828
829 /* Add new entry to forwarding table -- assumes lock held */
830 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
831 const u8 *mac, union vxlan_addr *ip,
832 __u16 state, __u16 flags,
833 __be16 port, __be32 src_vni, __be32 vni,
834 __u32 ifindex, __u16 ndm_flags,
835 bool swdev_notify)
836 {
837 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
838 struct vxlan_rdst *rd = NULL;
839 struct vxlan_fdb *f;
840 int notify = 0;
841 int rc;
842
843 f = __vxlan_find_mac(vxlan, mac, src_vni);
844 if (f) {
845 if (flags & NLM_F_EXCL) {
846 netdev_dbg(vxlan->dev,
847 "lost race to create %pM\n", mac);
848 return -EEXIST;
849 }
850
851 /* Do not allow an externally learned entry to take over an
852 * entry added by the user.
853 */
854 if (!(fdb_flags & NTF_EXT_LEARNED) ||
855 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
856 if (f->state != state) {
857 f->state = state;
858 f->updated = jiffies;
859 notify = 1;
860 }
861 if (f->flags != fdb_flags) {
862 f->flags = fdb_flags;
863 f->updated = jiffies;
864 notify = 1;
865 }
866 }
867
868 if ((flags & NLM_F_REPLACE)) {
869 /* Only change unicasts */
870 if (!(is_multicast_ether_addr(f->eth_addr) ||
871 is_zero_ether_addr(f->eth_addr))) {
872 notify |= vxlan_fdb_replace(f, ip, port, vni,
873 ifindex);
874 } else
875 return -EOPNOTSUPP;
876 }
877 if ((flags & NLM_F_APPEND) &&
878 (is_multicast_ether_addr(f->eth_addr) ||
879 is_zero_ether_addr(f->eth_addr))) {
880 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
881
882 if (rc < 0)
883 return rc;
884 notify |= rc;
885 }
886
887 if (ndm_flags & NTF_USE)
888 f->used = jiffies;
889 } else {
890 if (!(flags & NLM_F_CREATE))
891 return -ENOENT;
892
893 /* Disallow replace to add a multicast entry */
894 if ((flags & NLM_F_REPLACE) &&
895 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
896 return -EOPNOTSUPP;
897
898 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
899 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
900 vni, ifindex, fdb_flags, &f);
901 if (rc < 0)
902 return rc;
903 notify = 1;
904 }
905
906 if (notify) {
907 if (rd == NULL)
908 rd = first_remote_rtnl(f);
909 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, swdev_notify);
910 }
911
912 return 0;
913 }
914
915 static void vxlan_fdb_free(struct rcu_head *head)
916 {
917 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
918 struct vxlan_rdst *rd, *nd;
919
920 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
921 dst_cache_destroy(&rd->dst_cache);
922 kfree(rd);
923 }
924 kfree(f);
925 }
926
927 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
928 bool do_notify, bool swdev_notify)
929 {
930 struct vxlan_rdst *rd;
931
932 netdev_dbg(vxlan->dev,
933 "delete %pM\n", f->eth_addr);
934
935 --vxlan->addrcnt;
936 if (do_notify)
937 list_for_each_entry(rd, &f->remotes, list)
938 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
939 swdev_notify);
940
941 hlist_del_rcu(&f->hlist);
942 call_rcu(&f->rcu, vxlan_fdb_free);
943 }
944
945 static void vxlan_dst_free(struct rcu_head *head)
946 {
947 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
948
949 dst_cache_destroy(&rd->dst_cache);
950 kfree(rd);
951 }
952
953 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
954 struct vxlan_rdst *rd, bool swdev_notify)
955 {
956 list_del_rcu(&rd->list);
957 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify);
958 call_rcu(&rd->rcu, vxlan_dst_free);
959 }
960
961 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
962 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
963 __be32 *vni, u32 *ifindex)
964 {
965 struct net *net = dev_net(vxlan->dev);
966 int err;
967
968 if (tb[NDA_DST]) {
969 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
970 if (err)
971 return err;
972 } else {
973 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
974 if (remote->sa.sa_family == AF_INET) {
975 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
976 ip->sa.sa_family = AF_INET;
977 #if IS_ENABLED(CONFIG_IPV6)
978 } else {
979 ip->sin6.sin6_addr = in6addr_any;
980 ip->sa.sa_family = AF_INET6;
981 #endif
982 }
983 }
984
985 if (tb[NDA_PORT]) {
986 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
987 return -EINVAL;
988 *port = nla_get_be16(tb[NDA_PORT]);
989 } else {
990 *port = vxlan->cfg.dst_port;
991 }
992
993 if (tb[NDA_VNI]) {
994 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
995 return -EINVAL;
996 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
997 } else {
998 *vni = vxlan->default_dst.remote_vni;
999 }
1000
1001 if (tb[NDA_SRC_VNI]) {
1002 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1003 return -EINVAL;
1004 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1005 } else {
1006 *src_vni = vxlan->default_dst.remote_vni;
1007 }
1008
1009 if (tb[NDA_IFINDEX]) {
1010 struct net_device *tdev;
1011
1012 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1013 return -EINVAL;
1014 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1015 tdev = __dev_get_by_index(net, *ifindex);
1016 if (!tdev)
1017 return -EADDRNOTAVAIL;
1018 } else {
1019 *ifindex = 0;
1020 }
1021
1022 return 0;
1023 }
1024
1025 /* Add static entry (via netlink) */
1026 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1027 struct net_device *dev,
1028 const unsigned char *addr, u16 vid, u16 flags)
1029 {
1030 struct vxlan_dev *vxlan = netdev_priv(dev);
1031 /* struct net *net = dev_net(vxlan->dev); */
1032 union vxlan_addr ip;
1033 __be16 port;
1034 __be32 src_vni, vni;
1035 u32 ifindex;
1036 int err;
1037
1038 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1039 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1040 ndm->ndm_state);
1041 return -EINVAL;
1042 }
1043
1044 if (tb[NDA_DST] == NULL)
1045 return -EINVAL;
1046
1047 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1048 if (err)
1049 return err;
1050
1051 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1052 return -EAFNOSUPPORT;
1053
1054 spin_lock_bh(&vxlan->hash_lock);
1055 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1056 port, src_vni, vni, ifindex,
1057 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1058 true);
1059 spin_unlock_bh(&vxlan->hash_lock);
1060
1061 return err;
1062 }
1063
1064 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1065 const unsigned char *addr, union vxlan_addr ip,
1066 __be16 port, __be32 src_vni, __be32 vni,
1067 u32 ifindex, bool swdev_notify)
1068 {
1069 struct vxlan_fdb *f;
1070 struct vxlan_rdst *rd = NULL;
1071 int err = -ENOENT;
1072
1073 f = vxlan_find_mac(vxlan, addr, src_vni);
1074 if (!f)
1075 return err;
1076
1077 if (!vxlan_addr_any(&ip)) {
1078 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1079 if (!rd)
1080 goto out;
1081 }
1082
1083 /* remove a destination if it's not the only one on the list,
1084 * otherwise destroy the fdb entry
1085 */
1086 if (rd && !list_is_singular(&f->remotes)) {
1087 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1088 goto out;
1089 }
1090
1091 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1092
1093 out:
1094 return 0;
1095 }
1096
1097 /* Delete entry (via netlink) */
1098 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1099 struct net_device *dev,
1100 const unsigned char *addr, u16 vid)
1101 {
1102 struct vxlan_dev *vxlan = netdev_priv(dev);
1103 union vxlan_addr ip;
1104 __be32 src_vni, vni;
1105 __be16 port;
1106 u32 ifindex;
1107 int err;
1108
1109 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1110 if (err)
1111 return err;
1112
1113 spin_lock_bh(&vxlan->hash_lock);
1114 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1115 true);
1116 spin_unlock_bh(&vxlan->hash_lock);
1117
1118 return err;
1119 }
1120
1121 /* Dump forwarding table */
1122 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1123 struct net_device *dev,
1124 struct net_device *filter_dev, int *idx)
1125 {
1126 struct vxlan_dev *vxlan = netdev_priv(dev);
1127 unsigned int h;
1128 int err = 0;
1129
1130 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1131 struct vxlan_fdb *f;
1132
1133 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1134 struct vxlan_rdst *rd;
1135
1136 list_for_each_entry_rcu(rd, &f->remotes, list) {
1137 if (*idx < cb->args[2])
1138 goto skip;
1139
1140 err = vxlan_fdb_info(skb, vxlan, f,
1141 NETLINK_CB(cb->skb).portid,
1142 cb->nlh->nlmsg_seq,
1143 RTM_NEWNEIGH,
1144 NLM_F_MULTI, rd);
1145 if (err < 0)
1146 goto out;
1147 skip:
1148 *idx += 1;
1149 }
1150 }
1151 }
1152 out:
1153 return err;
1154 }
1155
1156 static int vxlan_fdb_get(struct sk_buff *skb,
1157 struct nlattr *tb[],
1158 struct net_device *dev,
1159 const unsigned char *addr,
1160 u16 vid, u32 portid, u32 seq,
1161 struct netlink_ext_ack *extack)
1162 {
1163 struct vxlan_dev *vxlan = netdev_priv(dev);
1164 struct vxlan_fdb *f;
1165 __be32 vni;
1166 int err;
1167
1168 if (tb[NDA_VNI])
1169 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1170 else
1171 vni = vxlan->default_dst.remote_vni;
1172
1173 rcu_read_lock();
1174
1175 f = __vxlan_find_mac(vxlan, addr, vni);
1176 if (!f) {
1177 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1178 err = -ENOENT;
1179 goto errout;
1180 }
1181
1182 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1183 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1184 errout:
1185 rcu_read_unlock();
1186 return err;
1187 }
1188
1189 /* Watch incoming packets to learn mapping between Ethernet address
1190 * and Tunnel endpoint.
1191 * Return true if packet is bogus and should be dropped.
1192 */
1193 static bool vxlan_snoop(struct net_device *dev,
1194 union vxlan_addr *src_ip, const u8 *src_mac,
1195 u32 src_ifindex, __be32 vni)
1196 {
1197 struct vxlan_dev *vxlan = netdev_priv(dev);
1198 struct vxlan_fdb *f;
1199 u32 ifindex = 0;
1200
1201 #if IS_ENABLED(CONFIG_IPV6)
1202 if (src_ip->sa.sa_family == AF_INET6 &&
1203 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1204 ifindex = src_ifindex;
1205 #endif
1206
1207 f = vxlan_find_mac(vxlan, src_mac, vni);
1208 if (likely(f)) {
1209 struct vxlan_rdst *rdst = first_remote_rcu(f);
1210
1211 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1212 rdst->remote_ifindex == ifindex))
1213 return false;
1214
1215 /* Don't migrate static entries, drop packets */
1216 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1217 return true;
1218
1219 if (net_ratelimit())
1220 netdev_info(dev,
1221 "%pM migrated from %pIS to %pIS\n",
1222 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1223
1224 rdst->remote_ip = *src_ip;
1225 f->updated = jiffies;
1226 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true);
1227 } else {
1228 /* learned new entry */
1229 spin_lock(&vxlan->hash_lock);
1230
1231 /* close off race between vxlan_flush and incoming packets */
1232 if (netif_running(dev))
1233 vxlan_fdb_update(vxlan, src_mac, src_ip,
1234 NUD_REACHABLE,
1235 NLM_F_EXCL|NLM_F_CREATE,
1236 vxlan->cfg.dst_port,
1237 vni,
1238 vxlan->default_dst.remote_vni,
1239 ifindex, NTF_SELF, true);
1240 spin_unlock(&vxlan->hash_lock);
1241 }
1242
1243 return false;
1244 }
1245
1246 /* See if multicast group is already in use by other ID */
1247 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1248 {
1249 struct vxlan_dev *vxlan;
1250 struct vxlan_sock *sock4;
1251 #if IS_ENABLED(CONFIG_IPV6)
1252 struct vxlan_sock *sock6;
1253 #endif
1254 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1255
1256 sock4 = rtnl_dereference(dev->vn4_sock);
1257
1258 /* The vxlan_sock is only used by dev, leaving group has
1259 * no effect on other vxlan devices.
1260 */
1261 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1262 return false;
1263 #if IS_ENABLED(CONFIG_IPV6)
1264 sock6 = rtnl_dereference(dev->vn6_sock);
1265 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1266 return false;
1267 #endif
1268
1269 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1270 if (!netif_running(vxlan->dev) || vxlan == dev)
1271 continue;
1272
1273 if (family == AF_INET &&
1274 rtnl_dereference(vxlan->vn4_sock) != sock4)
1275 continue;
1276 #if IS_ENABLED(CONFIG_IPV6)
1277 if (family == AF_INET6 &&
1278 rtnl_dereference(vxlan->vn6_sock) != sock6)
1279 continue;
1280 #endif
1281
1282 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1283 &dev->default_dst.remote_ip))
1284 continue;
1285
1286 if (vxlan->default_dst.remote_ifindex !=
1287 dev->default_dst.remote_ifindex)
1288 continue;
1289
1290 return true;
1291 }
1292
1293 return false;
1294 }
1295
1296 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1297 {
1298 struct vxlan_net *vn;
1299
1300 if (!vs)
1301 return false;
1302 if (!refcount_dec_and_test(&vs->refcnt))
1303 return false;
1304
1305 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1306 spin_lock(&vn->sock_lock);
1307 hlist_del_rcu(&vs->hlist);
1308 udp_tunnel_notify_del_rx_port(vs->sock,
1309 (vs->flags & VXLAN_F_GPE) ?
1310 UDP_TUNNEL_TYPE_VXLAN_GPE :
1311 UDP_TUNNEL_TYPE_VXLAN);
1312 spin_unlock(&vn->sock_lock);
1313
1314 return true;
1315 }
1316
1317 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1318 {
1319 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1320 #if IS_ENABLED(CONFIG_IPV6)
1321 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1322
1323 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1324 #endif
1325
1326 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1327 synchronize_net();
1328
1329 vxlan_vs_del_dev(vxlan);
1330
1331 if (__vxlan_sock_release_prep(sock4)) {
1332 udp_tunnel_sock_release(sock4->sock);
1333 kfree(sock4);
1334 }
1335
1336 #if IS_ENABLED(CONFIG_IPV6)
1337 if (__vxlan_sock_release_prep(sock6)) {
1338 udp_tunnel_sock_release(sock6->sock);
1339 kfree(sock6);
1340 }
1341 #endif
1342 }
1343
1344 /* Update multicast group membership when first VNI on
1345 * multicast address is brought up
1346 */
1347 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1348 {
1349 struct sock *sk;
1350 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1351 int ifindex = vxlan->default_dst.remote_ifindex;
1352 int ret = -EINVAL;
1353
1354 if (ip->sa.sa_family == AF_INET) {
1355 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1356 struct ip_mreqn mreq = {
1357 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1358 .imr_ifindex = ifindex,
1359 };
1360
1361 sk = sock4->sock->sk;
1362 lock_sock(sk);
1363 ret = ip_mc_join_group(sk, &mreq);
1364 release_sock(sk);
1365 #if IS_ENABLED(CONFIG_IPV6)
1366 } else {
1367 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1368
1369 sk = sock6->sock->sk;
1370 lock_sock(sk);
1371 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1372 &ip->sin6.sin6_addr);
1373 release_sock(sk);
1374 #endif
1375 }
1376
1377 return ret;
1378 }
1379
1380 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1381 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1382 {
1383 struct sock *sk;
1384 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1385 int ifindex = vxlan->default_dst.remote_ifindex;
1386 int ret = -EINVAL;
1387
1388 if (ip->sa.sa_family == AF_INET) {
1389 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1390 struct ip_mreqn mreq = {
1391 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1392 .imr_ifindex = ifindex,
1393 };
1394
1395 sk = sock4->sock->sk;
1396 lock_sock(sk);
1397 ret = ip_mc_leave_group(sk, &mreq);
1398 release_sock(sk);
1399 #if IS_ENABLED(CONFIG_IPV6)
1400 } else {
1401 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1402
1403 sk = sock6->sock->sk;
1404 lock_sock(sk);
1405 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1406 &ip->sin6.sin6_addr);
1407 release_sock(sk);
1408 #endif
1409 }
1410
1411 return ret;
1412 }
1413
1414 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1415 struct sk_buff *skb, u32 vxflags)
1416 {
1417 size_t start, offset;
1418
1419 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1420 goto out;
1421
1422 start = vxlan_rco_start(unparsed->vx_vni);
1423 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1424
1425 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1426 return false;
1427
1428 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1429 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1430 out:
1431 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1432 unparsed->vx_vni &= VXLAN_VNI_MASK;
1433 return true;
1434 }
1435
1436 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1437 struct sk_buff *skb, u32 vxflags,
1438 struct vxlan_metadata *md)
1439 {
1440 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1441 struct metadata_dst *tun_dst;
1442
1443 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1444 goto out;
1445
1446 md->gbp = ntohs(gbp->policy_id);
1447
1448 tun_dst = (struct metadata_dst *)skb_dst(skb);
1449 if (tun_dst) {
1450 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1451 tun_dst->u.tun_info.options_len = sizeof(*md);
1452 }
1453 if (gbp->dont_learn)
1454 md->gbp |= VXLAN_GBP_DONT_LEARN;
1455
1456 if (gbp->policy_applied)
1457 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1458
1459 /* In flow-based mode, GBP is carried in dst_metadata */
1460 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1461 skb->mark = md->gbp;
1462 out:
1463 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1464 }
1465
1466 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1467 __be16 *protocol,
1468 struct sk_buff *skb, u32 vxflags)
1469 {
1470 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1471
1472 /* Need to have Next Protocol set for interfaces in GPE mode. */
1473 if (!gpe->np_applied)
1474 return false;
1475 /* "The initial version is 0. If a receiver does not support the
1476 * version indicated it MUST drop the packet.
1477 */
1478 if (gpe->version != 0)
1479 return false;
1480 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1481 * processing MUST occur." However, we don't implement OAM
1482 * processing, thus drop the packet.
1483 */
1484 if (gpe->oam_flag)
1485 return false;
1486
1487 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1488 if (!*protocol)
1489 return false;
1490
1491 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1492 return true;
1493 }
1494
1495 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1496 struct vxlan_sock *vs,
1497 struct sk_buff *skb, __be32 vni)
1498 {
1499 union vxlan_addr saddr;
1500 u32 ifindex = skb->dev->ifindex;
1501
1502 skb_reset_mac_header(skb);
1503 skb->protocol = eth_type_trans(skb, vxlan->dev);
1504 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1505
1506 /* Ignore packet loops (and multicast echo) */
1507 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1508 return false;
1509
1510 /* Get address from the outer IP header */
1511 if (vxlan_get_sk_family(vs) == AF_INET) {
1512 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1513 saddr.sa.sa_family = AF_INET;
1514 #if IS_ENABLED(CONFIG_IPV6)
1515 } else {
1516 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1517 saddr.sa.sa_family = AF_INET6;
1518 #endif
1519 }
1520
1521 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1522 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1523 return false;
1524
1525 return true;
1526 }
1527
1528 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1529 struct sk_buff *skb)
1530 {
1531 int err = 0;
1532
1533 if (vxlan_get_sk_family(vs) == AF_INET)
1534 err = IP_ECN_decapsulate(oiph, skb);
1535 #if IS_ENABLED(CONFIG_IPV6)
1536 else
1537 err = IP6_ECN_decapsulate(oiph, skb);
1538 #endif
1539
1540 if (unlikely(err) && log_ecn_error) {
1541 if (vxlan_get_sk_family(vs) == AF_INET)
1542 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1543 &((struct iphdr *)oiph)->saddr,
1544 ((struct iphdr *)oiph)->tos);
1545 else
1546 net_info_ratelimited("non-ECT from %pI6\n",
1547 &((struct ipv6hdr *)oiph)->saddr);
1548 }
1549 return err <= 1;
1550 }
1551
1552 /* Callback from net/ipv4/udp.c to receive packets */
1553 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1554 {
1555 struct pcpu_sw_netstats *stats;
1556 struct vxlan_dev *vxlan;
1557 struct vxlan_sock *vs;
1558 struct vxlanhdr unparsed;
1559 struct vxlan_metadata _md;
1560 struct vxlan_metadata *md = &_md;
1561 __be16 protocol = htons(ETH_P_TEB);
1562 bool raw_proto = false;
1563 void *oiph;
1564 __be32 vni = 0;
1565
1566 /* Need UDP and VXLAN header to be present */
1567 if (!pskb_may_pull(skb, VXLAN_HLEN))
1568 goto drop;
1569
1570 unparsed = *vxlan_hdr(skb);
1571 /* VNI flag always required to be set */
1572 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1573 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1574 ntohl(vxlan_hdr(skb)->vx_flags),
1575 ntohl(vxlan_hdr(skb)->vx_vni));
1576 /* Return non vxlan pkt */
1577 goto drop;
1578 }
1579 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1580 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1581
1582 vs = rcu_dereference_sk_user_data(sk);
1583 if (!vs)
1584 goto drop;
1585
1586 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1587
1588 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1589 if (!vxlan)
1590 goto drop;
1591
1592 /* For backwards compatibility, only allow reserved fields to be
1593 * used by VXLAN extensions if explicitly requested.
1594 */
1595 if (vs->flags & VXLAN_F_GPE) {
1596 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1597 goto drop;
1598 raw_proto = true;
1599 }
1600
1601 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1602 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1603 goto drop;
1604
1605 if (vxlan_collect_metadata(vs)) {
1606 struct metadata_dst *tun_dst;
1607
1608 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1609 key32_to_tunnel_id(vni), sizeof(*md));
1610
1611 if (!tun_dst)
1612 goto drop;
1613
1614 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1615
1616 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1617 } else {
1618 memset(md, 0, sizeof(*md));
1619 }
1620
1621 if (vs->flags & VXLAN_F_REMCSUM_RX)
1622 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1623 goto drop;
1624 if (vs->flags & VXLAN_F_GBP)
1625 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1626 /* Note that GBP and GPE can never be active together. This is
1627 * ensured in vxlan_dev_configure.
1628 */
1629
1630 if (unparsed.vx_flags || unparsed.vx_vni) {
1631 /* If there are any unprocessed flags remaining treat
1632 * this as a malformed packet. This behavior diverges from
1633 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1634 * in reserved fields are to be ignored. The approach here
1635 * maintains compatibility with previous stack code, and also
1636 * is more robust and provides a little more security in
1637 * adding extensions to VXLAN.
1638 */
1639 goto drop;
1640 }
1641
1642 if (!raw_proto) {
1643 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1644 goto drop;
1645 } else {
1646 skb_reset_mac_header(skb);
1647 skb->dev = vxlan->dev;
1648 skb->pkt_type = PACKET_HOST;
1649 }
1650
1651 oiph = skb_network_header(skb);
1652 skb_reset_network_header(skb);
1653
1654 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1655 ++vxlan->dev->stats.rx_frame_errors;
1656 ++vxlan->dev->stats.rx_errors;
1657 goto drop;
1658 }
1659
1660 stats = this_cpu_ptr(vxlan->dev->tstats);
1661 u64_stats_update_begin(&stats->syncp);
1662 stats->rx_packets++;
1663 stats->rx_bytes += skb->len;
1664 u64_stats_update_end(&stats->syncp);
1665
1666 gro_cells_receive(&vxlan->gro_cells, skb);
1667 return 0;
1668
1669 drop:
1670 /* Consume bad packet */
1671 kfree_skb(skb);
1672 return 0;
1673 }
1674
1675 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1676 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1677 {
1678 struct vxlan_dev *vxlan;
1679 struct vxlan_sock *vs;
1680 struct vxlanhdr *hdr;
1681 __be32 vni;
1682
1683 if (skb->len < VXLAN_HLEN)
1684 return -EINVAL;
1685
1686 hdr = vxlan_hdr(skb);
1687
1688 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1689 return -EINVAL;
1690
1691 vs = rcu_dereference_sk_user_data(sk);
1692 if (!vs)
1693 return -ENOENT;
1694
1695 vni = vxlan_vni(hdr->vx_vni);
1696 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1697 if (!vxlan)
1698 return -ENOENT;
1699
1700 return 0;
1701 }
1702
1703 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1704 {
1705 struct vxlan_dev *vxlan = netdev_priv(dev);
1706 struct arphdr *parp;
1707 u8 *arpptr, *sha;
1708 __be32 sip, tip;
1709 struct neighbour *n;
1710
1711 if (dev->flags & IFF_NOARP)
1712 goto out;
1713
1714 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1715 dev->stats.tx_dropped++;
1716 goto out;
1717 }
1718 parp = arp_hdr(skb);
1719
1720 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1721 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1722 parp->ar_pro != htons(ETH_P_IP) ||
1723 parp->ar_op != htons(ARPOP_REQUEST) ||
1724 parp->ar_hln != dev->addr_len ||
1725 parp->ar_pln != 4)
1726 goto out;
1727 arpptr = (u8 *)parp + sizeof(struct arphdr);
1728 sha = arpptr;
1729 arpptr += dev->addr_len; /* sha */
1730 memcpy(&sip, arpptr, sizeof(sip));
1731 arpptr += sizeof(sip);
1732 arpptr += dev->addr_len; /* tha */
1733 memcpy(&tip, arpptr, sizeof(tip));
1734
1735 if (ipv4_is_loopback(tip) ||
1736 ipv4_is_multicast(tip))
1737 goto out;
1738
1739 n = neigh_lookup(&arp_tbl, &tip, dev);
1740
1741 if (n) {
1742 struct vxlan_fdb *f;
1743 struct sk_buff *reply;
1744
1745 if (!(n->nud_state & NUD_CONNECTED)) {
1746 neigh_release(n);
1747 goto out;
1748 }
1749
1750 f = vxlan_find_mac(vxlan, n->ha, vni);
1751 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1752 /* bridge-local neighbor */
1753 neigh_release(n);
1754 goto out;
1755 }
1756
1757 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1758 n->ha, sha);
1759
1760 neigh_release(n);
1761
1762 if (reply == NULL)
1763 goto out;
1764
1765 skb_reset_mac_header(reply);
1766 __skb_pull(reply, skb_network_offset(reply));
1767 reply->ip_summed = CHECKSUM_UNNECESSARY;
1768 reply->pkt_type = PACKET_HOST;
1769
1770 if (netif_rx_ni(reply) == NET_RX_DROP)
1771 dev->stats.rx_dropped++;
1772 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1773 union vxlan_addr ipa = {
1774 .sin.sin_addr.s_addr = tip,
1775 .sin.sin_family = AF_INET,
1776 };
1777
1778 vxlan_ip_miss(dev, &ipa);
1779 }
1780 out:
1781 consume_skb(skb);
1782 return NETDEV_TX_OK;
1783 }
1784
1785 #if IS_ENABLED(CONFIG_IPV6)
1786 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1787 struct neighbour *n, bool isrouter)
1788 {
1789 struct net_device *dev = request->dev;
1790 struct sk_buff *reply;
1791 struct nd_msg *ns, *na;
1792 struct ipv6hdr *pip6;
1793 u8 *daddr;
1794 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1795 int ns_olen;
1796 int i, len;
1797
1798 if (dev == NULL || !pskb_may_pull(request, request->len))
1799 return NULL;
1800
1801 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1802 sizeof(*na) + na_olen + dev->needed_tailroom;
1803 reply = alloc_skb(len, GFP_ATOMIC);
1804 if (reply == NULL)
1805 return NULL;
1806
1807 reply->protocol = htons(ETH_P_IPV6);
1808 reply->dev = dev;
1809 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1810 skb_push(reply, sizeof(struct ethhdr));
1811 skb_reset_mac_header(reply);
1812
1813 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1814
1815 daddr = eth_hdr(request)->h_source;
1816 ns_olen = request->len - skb_network_offset(request) -
1817 sizeof(struct ipv6hdr) - sizeof(*ns);
1818 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1819 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1820 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1821 break;
1822 }
1823 }
1824
1825 /* Ethernet header */
1826 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1827 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1828 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1829 reply->protocol = htons(ETH_P_IPV6);
1830
1831 skb_pull(reply, sizeof(struct ethhdr));
1832 skb_reset_network_header(reply);
1833 skb_put(reply, sizeof(struct ipv6hdr));
1834
1835 /* IPv6 header */
1836
1837 pip6 = ipv6_hdr(reply);
1838 memset(pip6, 0, sizeof(struct ipv6hdr));
1839 pip6->version = 6;
1840 pip6->priority = ipv6_hdr(request)->priority;
1841 pip6->nexthdr = IPPROTO_ICMPV6;
1842 pip6->hop_limit = 255;
1843 pip6->daddr = ipv6_hdr(request)->saddr;
1844 pip6->saddr = *(struct in6_addr *)n->primary_key;
1845
1846 skb_pull(reply, sizeof(struct ipv6hdr));
1847 skb_reset_transport_header(reply);
1848
1849 /* Neighbor Advertisement */
1850 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1851 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1852 na->icmph.icmp6_router = isrouter;
1853 na->icmph.icmp6_override = 1;
1854 na->icmph.icmp6_solicited = 1;
1855 na->target = ns->target;
1856 ether_addr_copy(&na->opt[2], n->ha);
1857 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1858 na->opt[1] = na_olen >> 3;
1859
1860 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1861 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1862 csum_partial(na, sizeof(*na)+na_olen, 0));
1863
1864 pip6->payload_len = htons(sizeof(*na)+na_olen);
1865
1866 skb_push(reply, sizeof(struct ipv6hdr));
1867
1868 reply->ip_summed = CHECKSUM_UNNECESSARY;
1869
1870 return reply;
1871 }
1872
1873 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1874 {
1875 struct vxlan_dev *vxlan = netdev_priv(dev);
1876 const struct in6_addr *daddr;
1877 const struct ipv6hdr *iphdr;
1878 struct inet6_dev *in6_dev;
1879 struct neighbour *n;
1880 struct nd_msg *msg;
1881
1882 in6_dev = __in6_dev_get(dev);
1883 if (!in6_dev)
1884 goto out;
1885
1886 iphdr = ipv6_hdr(skb);
1887 daddr = &iphdr->daddr;
1888 msg = (struct nd_msg *)(iphdr + 1);
1889
1890 if (ipv6_addr_loopback(daddr) ||
1891 ipv6_addr_is_multicast(&msg->target))
1892 goto out;
1893
1894 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1895
1896 if (n) {
1897 struct vxlan_fdb *f;
1898 struct sk_buff *reply;
1899
1900 if (!(n->nud_state & NUD_CONNECTED)) {
1901 neigh_release(n);
1902 goto out;
1903 }
1904
1905 f = vxlan_find_mac(vxlan, n->ha, vni);
1906 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1907 /* bridge-local neighbor */
1908 neigh_release(n);
1909 goto out;
1910 }
1911
1912 reply = vxlan_na_create(skb, n,
1913 !!(f ? f->flags & NTF_ROUTER : 0));
1914
1915 neigh_release(n);
1916
1917 if (reply == NULL)
1918 goto out;
1919
1920 if (netif_rx_ni(reply) == NET_RX_DROP)
1921 dev->stats.rx_dropped++;
1922
1923 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1924 union vxlan_addr ipa = {
1925 .sin6.sin6_addr = msg->target,
1926 .sin6.sin6_family = AF_INET6,
1927 };
1928
1929 vxlan_ip_miss(dev, &ipa);
1930 }
1931
1932 out:
1933 consume_skb(skb);
1934 return NETDEV_TX_OK;
1935 }
1936 #endif
1937
1938 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1939 {
1940 struct vxlan_dev *vxlan = netdev_priv(dev);
1941 struct neighbour *n;
1942
1943 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1944 return false;
1945
1946 n = NULL;
1947 switch (ntohs(eth_hdr(skb)->h_proto)) {
1948 case ETH_P_IP:
1949 {
1950 struct iphdr *pip;
1951
1952 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1953 return false;
1954 pip = ip_hdr(skb);
1955 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1956 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1957 union vxlan_addr ipa = {
1958 .sin.sin_addr.s_addr = pip->daddr,
1959 .sin.sin_family = AF_INET,
1960 };
1961
1962 vxlan_ip_miss(dev, &ipa);
1963 return false;
1964 }
1965
1966 break;
1967 }
1968 #if IS_ENABLED(CONFIG_IPV6)
1969 case ETH_P_IPV6:
1970 {
1971 struct ipv6hdr *pip6;
1972
1973 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1974 return false;
1975 pip6 = ipv6_hdr(skb);
1976 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1977 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1978 union vxlan_addr ipa = {
1979 .sin6.sin6_addr = pip6->daddr,
1980 .sin6.sin6_family = AF_INET6,
1981 };
1982
1983 vxlan_ip_miss(dev, &ipa);
1984 return false;
1985 }
1986
1987 break;
1988 }
1989 #endif
1990 default:
1991 return false;
1992 }
1993
1994 if (n) {
1995 bool diff;
1996
1997 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1998 if (diff) {
1999 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2000 dev->addr_len);
2001 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2002 }
2003 neigh_release(n);
2004 return diff;
2005 }
2006
2007 return false;
2008 }
2009
2010 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2011 struct vxlan_metadata *md)
2012 {
2013 struct vxlanhdr_gbp *gbp;
2014
2015 if (!md->gbp)
2016 return;
2017
2018 gbp = (struct vxlanhdr_gbp *)vxh;
2019 vxh->vx_flags |= VXLAN_HF_GBP;
2020
2021 if (md->gbp & VXLAN_GBP_DONT_LEARN)
2022 gbp->dont_learn = 1;
2023
2024 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2025 gbp->policy_applied = 1;
2026
2027 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2028 }
2029
2030 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2031 __be16 protocol)
2032 {
2033 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2034
2035 gpe->np_applied = 1;
2036 gpe->next_protocol = tun_p_from_eth_p(protocol);
2037 if (!gpe->next_protocol)
2038 return -EPFNOSUPPORT;
2039 return 0;
2040 }
2041
2042 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2043 int iphdr_len, __be32 vni,
2044 struct vxlan_metadata *md, u32 vxflags,
2045 bool udp_sum)
2046 {
2047 struct vxlanhdr *vxh;
2048 int min_headroom;
2049 int err;
2050 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2051 __be16 inner_protocol = htons(ETH_P_TEB);
2052
2053 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2054 skb->ip_summed == CHECKSUM_PARTIAL) {
2055 int csum_start = skb_checksum_start_offset(skb);
2056
2057 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2058 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2059 (skb->csum_offset == offsetof(struct udphdr, check) ||
2060 skb->csum_offset == offsetof(struct tcphdr, check)))
2061 type |= SKB_GSO_TUNNEL_REMCSUM;
2062 }
2063
2064 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2065 + VXLAN_HLEN + iphdr_len;
2066
2067 /* Need space for new headers (invalidates iph ptr) */
2068 err = skb_cow_head(skb, min_headroom);
2069 if (unlikely(err))
2070 return err;
2071
2072 err = iptunnel_handle_offloads(skb, type);
2073 if (err)
2074 return err;
2075
2076 vxh = __skb_push(skb, sizeof(*vxh));
2077 vxh->vx_flags = VXLAN_HF_VNI;
2078 vxh->vx_vni = vxlan_vni_field(vni);
2079
2080 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2081 unsigned int start;
2082
2083 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2084 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2085 vxh->vx_flags |= VXLAN_HF_RCO;
2086
2087 if (!skb_is_gso(skb)) {
2088 skb->ip_summed = CHECKSUM_NONE;
2089 skb->encapsulation = 0;
2090 }
2091 }
2092
2093 if (vxflags & VXLAN_F_GBP)
2094 vxlan_build_gbp_hdr(vxh, vxflags, md);
2095 if (vxflags & VXLAN_F_GPE) {
2096 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2097 if (err < 0)
2098 return err;
2099 inner_protocol = skb->protocol;
2100 }
2101
2102 skb_set_inner_protocol(skb, inner_protocol);
2103 return 0;
2104 }
2105
2106 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2107 struct vxlan_sock *sock4,
2108 struct sk_buff *skb, int oif, u8 tos,
2109 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2110 struct dst_cache *dst_cache,
2111 const struct ip_tunnel_info *info)
2112 {
2113 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2114 struct rtable *rt = NULL;
2115 struct flowi4 fl4;
2116
2117 if (!sock4)
2118 return ERR_PTR(-EIO);
2119
2120 if (tos && !info)
2121 use_cache = false;
2122 if (use_cache) {
2123 rt = dst_cache_get_ip4(dst_cache, saddr);
2124 if (rt)
2125 return rt;
2126 }
2127
2128 memset(&fl4, 0, sizeof(fl4));
2129 fl4.flowi4_oif = oif;
2130 fl4.flowi4_tos = RT_TOS(tos);
2131 fl4.flowi4_mark = skb->mark;
2132 fl4.flowi4_proto = IPPROTO_UDP;
2133 fl4.daddr = daddr;
2134 fl4.saddr = *saddr;
2135 fl4.fl4_dport = dport;
2136 fl4.fl4_sport = sport;
2137
2138 rt = ip_route_output_key(vxlan->net, &fl4);
2139 if (likely(!IS_ERR(rt))) {
2140 if (rt->dst.dev == dev) {
2141 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2142 ip_rt_put(rt);
2143 return ERR_PTR(-ELOOP);
2144 }
2145
2146 *saddr = fl4.saddr;
2147 if (use_cache)
2148 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2149 } else {
2150 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2151 return ERR_PTR(-ENETUNREACH);
2152 }
2153 return rt;
2154 }
2155
2156 #if IS_ENABLED(CONFIG_IPV6)
2157 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2158 struct net_device *dev,
2159 struct vxlan_sock *sock6,
2160 struct sk_buff *skb, int oif, u8 tos,
2161 __be32 label,
2162 const struct in6_addr *daddr,
2163 struct in6_addr *saddr,
2164 __be16 dport, __be16 sport,
2165 struct dst_cache *dst_cache,
2166 const struct ip_tunnel_info *info)
2167 {
2168 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2169 struct dst_entry *ndst;
2170 struct flowi6 fl6;
2171 int err;
2172
2173 if (!sock6)
2174 return ERR_PTR(-EIO);
2175
2176 if (tos && !info)
2177 use_cache = false;
2178 if (use_cache) {
2179 ndst = dst_cache_get_ip6(dst_cache, saddr);
2180 if (ndst)
2181 return ndst;
2182 }
2183
2184 memset(&fl6, 0, sizeof(fl6));
2185 fl6.flowi6_oif = oif;
2186 fl6.daddr = *daddr;
2187 fl6.saddr = *saddr;
2188 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2189 fl6.flowi6_mark = skb->mark;
2190 fl6.flowi6_proto = IPPROTO_UDP;
2191 fl6.fl6_dport = dport;
2192 fl6.fl6_sport = sport;
2193
2194 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2195 sock6->sock->sk,
2196 &ndst, &fl6);
2197 if (unlikely(err < 0)) {
2198 netdev_dbg(dev, "no route to %pI6\n", daddr);
2199 return ERR_PTR(-ENETUNREACH);
2200 }
2201
2202 if (unlikely(ndst->dev == dev)) {
2203 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2204 dst_release(ndst);
2205 return ERR_PTR(-ELOOP);
2206 }
2207
2208 *saddr = fl6.saddr;
2209 if (use_cache)
2210 dst_cache_set_ip6(dst_cache, ndst, saddr);
2211 return ndst;
2212 }
2213 #endif
2214
2215 /* Bypass encapsulation if the destination is local */
2216 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2217 struct vxlan_dev *dst_vxlan, __be32 vni)
2218 {
2219 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2220 union vxlan_addr loopback;
2221 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2222 struct net_device *dev = skb->dev;
2223 int len = skb->len;
2224
2225 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2226 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2227 skb->pkt_type = PACKET_HOST;
2228 skb->encapsulation = 0;
2229 skb->dev = dst_vxlan->dev;
2230 __skb_pull(skb, skb_network_offset(skb));
2231
2232 if (remote_ip->sa.sa_family == AF_INET) {
2233 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2234 loopback.sa.sa_family = AF_INET;
2235 #if IS_ENABLED(CONFIG_IPV6)
2236 } else {
2237 loopback.sin6.sin6_addr = in6addr_loopback;
2238 loopback.sa.sa_family = AF_INET6;
2239 #endif
2240 }
2241
2242 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2243 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2244 vni);
2245
2246 u64_stats_update_begin(&tx_stats->syncp);
2247 tx_stats->tx_packets++;
2248 tx_stats->tx_bytes += len;
2249 u64_stats_update_end(&tx_stats->syncp);
2250
2251 if (netif_rx(skb) == NET_RX_SUCCESS) {
2252 u64_stats_update_begin(&rx_stats->syncp);
2253 rx_stats->rx_packets++;
2254 rx_stats->rx_bytes += len;
2255 u64_stats_update_end(&rx_stats->syncp);
2256 } else {
2257 dev->stats.rx_dropped++;
2258 }
2259 }
2260
2261 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2262 struct vxlan_dev *vxlan,
2263 union vxlan_addr *daddr,
2264 __be16 dst_port, int dst_ifindex, __be32 vni,
2265 struct dst_entry *dst,
2266 u32 rt_flags)
2267 {
2268 #if IS_ENABLED(CONFIG_IPV6)
2269 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2270 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2271 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2272 */
2273 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2274 #endif
2275 /* Bypass encapsulation if the destination is local */
2276 if (rt_flags & RTCF_LOCAL &&
2277 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2278 struct vxlan_dev *dst_vxlan;
2279
2280 dst_release(dst);
2281 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2282 daddr->sa.sa_family, dst_port,
2283 vxlan->cfg.flags);
2284 if (!dst_vxlan) {
2285 dev->stats.tx_errors++;
2286 kfree_skb(skb);
2287
2288 return -ENOENT;
2289 }
2290 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2291 return 1;
2292 }
2293
2294 return 0;
2295 }
2296
2297 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2298 __be32 default_vni, struct vxlan_rdst *rdst,
2299 bool did_rsc)
2300 {
2301 struct dst_cache *dst_cache;
2302 struct ip_tunnel_info *info;
2303 struct vxlan_dev *vxlan = netdev_priv(dev);
2304 const struct iphdr *old_iph = ip_hdr(skb);
2305 union vxlan_addr *dst;
2306 union vxlan_addr remote_ip, local_ip;
2307 struct vxlan_metadata _md;
2308 struct vxlan_metadata *md = &_md;
2309 __be16 src_port = 0, dst_port;
2310 struct dst_entry *ndst = NULL;
2311 __be32 vni, label;
2312 __u8 tos, ttl;
2313 int ifindex;
2314 int err;
2315 u32 flags = vxlan->cfg.flags;
2316 bool udp_sum = false;
2317 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2318
2319 info = skb_tunnel_info(skb);
2320
2321 if (rdst) {
2322 dst = &rdst->remote_ip;
2323 if (vxlan_addr_any(dst)) {
2324 if (did_rsc) {
2325 /* short-circuited back to local bridge */
2326 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2327 return;
2328 }
2329 goto drop;
2330 }
2331
2332 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2333 vni = (rdst->remote_vni) ? : default_vni;
2334 ifindex = rdst->remote_ifindex;
2335 local_ip = vxlan->cfg.saddr;
2336 dst_cache = &rdst->dst_cache;
2337 md->gbp = skb->mark;
2338 if (flags & VXLAN_F_TTL_INHERIT) {
2339 ttl = ip_tunnel_get_ttl(old_iph, skb);
2340 } else {
2341 ttl = vxlan->cfg.ttl;
2342 if (!ttl && vxlan_addr_multicast(dst))
2343 ttl = 1;
2344 }
2345
2346 tos = vxlan->cfg.tos;
2347 if (tos == 1)
2348 tos = ip_tunnel_get_dsfield(old_iph, skb);
2349
2350 if (dst->sa.sa_family == AF_INET)
2351 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2352 else
2353 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2354 label = vxlan->cfg.label;
2355 } else {
2356 if (!info) {
2357 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2358 dev->name);
2359 goto drop;
2360 }
2361 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2362 if (remote_ip.sa.sa_family == AF_INET) {
2363 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2364 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2365 } else {
2366 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2367 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2368 }
2369 dst = &remote_ip;
2370 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2371 vni = tunnel_id_to_key32(info->key.tun_id);
2372 ifindex = 0;
2373 dst_cache = &info->dst_cache;
2374 if (info->options_len &&
2375 info->key.tun_flags & TUNNEL_VXLAN_OPT)
2376 md = ip_tunnel_info_opts(info);
2377 ttl = info->key.ttl;
2378 tos = info->key.tos;
2379 label = info->key.label;
2380 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2381 }
2382 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2383 vxlan->cfg.port_max, true);
2384
2385 rcu_read_lock();
2386 if (dst->sa.sa_family == AF_INET) {
2387 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2388 struct rtable *rt;
2389 __be16 df = 0;
2390
2391 if (!ifindex)
2392 ifindex = sock4->sock->sk->sk_bound_dev_if;
2393
2394 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2395 dst->sin.sin_addr.s_addr,
2396 &local_ip.sin.sin_addr.s_addr,
2397 dst_port, src_port,
2398 dst_cache, info);
2399 if (IS_ERR(rt)) {
2400 err = PTR_ERR(rt);
2401 goto tx_error;
2402 }
2403
2404 if (!info) {
2405 /* Bypass encapsulation if the destination is local */
2406 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2407 dst_port, ifindex, vni,
2408 &rt->dst, rt->rt_flags);
2409 if (err)
2410 goto out_unlock;
2411
2412 if (vxlan->cfg.df == VXLAN_DF_SET) {
2413 df = htons(IP_DF);
2414 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2415 struct ethhdr *eth = eth_hdr(skb);
2416
2417 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2418 (ntohs(eth->h_proto) == ETH_P_IP &&
2419 old_iph->frag_off & htons(IP_DF)))
2420 df = htons(IP_DF);
2421 }
2422 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2423 df = htons(IP_DF);
2424 }
2425
2426 ndst = &rt->dst;
2427 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2428
2429 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2430 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2431 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2432 vni, md, flags, udp_sum);
2433 if (err < 0)
2434 goto tx_error;
2435
2436 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2437 dst->sin.sin_addr.s_addr, tos, ttl, df,
2438 src_port, dst_port, xnet, !udp_sum);
2439 #if IS_ENABLED(CONFIG_IPV6)
2440 } else {
2441 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2442
2443 if (!ifindex)
2444 ifindex = sock6->sock->sk->sk_bound_dev_if;
2445
2446 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2447 label, &dst->sin6.sin6_addr,
2448 &local_ip.sin6.sin6_addr,
2449 dst_port, src_port,
2450 dst_cache, info);
2451 if (IS_ERR(ndst)) {
2452 err = PTR_ERR(ndst);
2453 ndst = NULL;
2454 goto tx_error;
2455 }
2456
2457 if (!info) {
2458 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2459
2460 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2461 dst_port, ifindex, vni,
2462 ndst, rt6i_flags);
2463 if (err)
2464 goto out_unlock;
2465 }
2466
2467 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2468
2469 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2470 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2471 skb_scrub_packet(skb, xnet);
2472 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2473 vni, md, flags, udp_sum);
2474 if (err < 0)
2475 goto tx_error;
2476
2477 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2478 &local_ip.sin6.sin6_addr,
2479 &dst->sin6.sin6_addr, tos, ttl,
2480 label, src_port, dst_port, !udp_sum);
2481 #endif
2482 }
2483 out_unlock:
2484 rcu_read_unlock();
2485 return;
2486
2487 drop:
2488 dev->stats.tx_dropped++;
2489 dev_kfree_skb(skb);
2490 return;
2491
2492 tx_error:
2493 rcu_read_unlock();
2494 if (err == -ELOOP)
2495 dev->stats.collisions++;
2496 else if (err == -ENETUNREACH)
2497 dev->stats.tx_carrier_errors++;
2498 dst_release(ndst);
2499 dev->stats.tx_errors++;
2500 kfree_skb(skb);
2501 }
2502
2503 /* Transmit local packets over Vxlan
2504 *
2505 * Outer IP header inherits ECN and DF from inner header.
2506 * Outer UDP destination is the VXLAN assigned port.
2507 * source port is based on hash of flow
2508 */
2509 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2510 {
2511 struct vxlan_dev *vxlan = netdev_priv(dev);
2512 struct vxlan_rdst *rdst, *fdst = NULL;
2513 const struct ip_tunnel_info *info;
2514 bool did_rsc = false;
2515 struct vxlan_fdb *f;
2516 struct ethhdr *eth;
2517 __be32 vni = 0;
2518
2519 info = skb_tunnel_info(skb);
2520
2521 skb_reset_mac_header(skb);
2522
2523 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2524 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2525 info->mode & IP_TUNNEL_INFO_TX) {
2526 vni = tunnel_id_to_key32(info->key.tun_id);
2527 } else {
2528 if (info && info->mode & IP_TUNNEL_INFO_TX)
2529 vxlan_xmit_one(skb, dev, vni, NULL, false);
2530 else
2531 kfree_skb(skb);
2532 return NETDEV_TX_OK;
2533 }
2534 }
2535
2536 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2537 eth = eth_hdr(skb);
2538 if (ntohs(eth->h_proto) == ETH_P_ARP)
2539 return arp_reduce(dev, skb, vni);
2540 #if IS_ENABLED(CONFIG_IPV6)
2541 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2542 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2543 sizeof(struct nd_msg)) &&
2544 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2545 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2546
2547 if (m->icmph.icmp6_code == 0 &&
2548 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2549 return neigh_reduce(dev, skb, vni);
2550 }
2551 #endif
2552 }
2553
2554 eth = eth_hdr(skb);
2555 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2556 did_rsc = false;
2557
2558 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2559 (ntohs(eth->h_proto) == ETH_P_IP ||
2560 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2561 did_rsc = route_shortcircuit(dev, skb);
2562 if (did_rsc)
2563 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2564 }
2565
2566 if (f == NULL) {
2567 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2568 if (f == NULL) {
2569 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2570 !is_multicast_ether_addr(eth->h_dest))
2571 vxlan_fdb_miss(vxlan, eth->h_dest);
2572
2573 dev->stats.tx_dropped++;
2574 kfree_skb(skb);
2575 return NETDEV_TX_OK;
2576 }
2577 }
2578
2579 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2580 struct sk_buff *skb1;
2581
2582 if (!fdst) {
2583 fdst = rdst;
2584 continue;
2585 }
2586 skb1 = skb_clone(skb, GFP_ATOMIC);
2587 if (skb1)
2588 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2589 }
2590
2591 if (fdst)
2592 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2593 else
2594 kfree_skb(skb);
2595 return NETDEV_TX_OK;
2596 }
2597
2598 /* Walk the forwarding table and purge stale entries */
2599 static void vxlan_cleanup(struct timer_list *t)
2600 {
2601 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2602 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2603 unsigned int h;
2604
2605 if (!netif_running(vxlan->dev))
2606 return;
2607
2608 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2609 struct hlist_node *p, *n;
2610
2611 spin_lock_bh(&vxlan->hash_lock);
2612 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2613 struct vxlan_fdb *f
2614 = container_of(p, struct vxlan_fdb, hlist);
2615 unsigned long timeout;
2616
2617 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2618 continue;
2619
2620 if (f->flags & NTF_EXT_LEARNED)
2621 continue;
2622
2623 timeout = f->used + vxlan->cfg.age_interval * HZ;
2624 if (time_before_eq(timeout, jiffies)) {
2625 netdev_dbg(vxlan->dev,
2626 "garbage collect %pM\n",
2627 f->eth_addr);
2628 f->state = NUD_STALE;
2629 vxlan_fdb_destroy(vxlan, f, true, true);
2630 } else if (time_before(timeout, next_timer))
2631 next_timer = timeout;
2632 }
2633 spin_unlock_bh(&vxlan->hash_lock);
2634 }
2635
2636 mod_timer(&vxlan->age_timer, next_timer);
2637 }
2638
2639 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2640 {
2641 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2642
2643 spin_lock(&vn->sock_lock);
2644 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2645 #if IS_ENABLED(CONFIG_IPV6)
2646 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2647 #endif
2648 spin_unlock(&vn->sock_lock);
2649 }
2650
2651 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2652 struct vxlan_dev_node *node)
2653 {
2654 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2655 __be32 vni = vxlan->default_dst.remote_vni;
2656
2657 node->vxlan = vxlan;
2658 spin_lock(&vn->sock_lock);
2659 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2660 spin_unlock(&vn->sock_lock);
2661 }
2662
2663 /* Setup stats when device is created */
2664 static int vxlan_init(struct net_device *dev)
2665 {
2666 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2667 if (!dev->tstats)
2668 return -ENOMEM;
2669
2670 return 0;
2671 }
2672
2673 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2674 {
2675 struct vxlan_fdb *f;
2676
2677 spin_lock_bh(&vxlan->hash_lock);
2678 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2679 if (f)
2680 vxlan_fdb_destroy(vxlan, f, true, true);
2681 spin_unlock_bh(&vxlan->hash_lock);
2682 }
2683
2684 static void vxlan_uninit(struct net_device *dev)
2685 {
2686 struct vxlan_dev *vxlan = netdev_priv(dev);
2687
2688 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2689
2690 free_percpu(dev->tstats);
2691 }
2692
2693 /* Start ageing timer and join group when device is brought up */
2694 static int vxlan_open(struct net_device *dev)
2695 {
2696 struct vxlan_dev *vxlan = netdev_priv(dev);
2697 int ret;
2698
2699 ret = vxlan_sock_add(vxlan);
2700 if (ret < 0)
2701 return ret;
2702
2703 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2704 ret = vxlan_igmp_join(vxlan);
2705 if (ret == -EADDRINUSE)
2706 ret = 0;
2707 if (ret) {
2708 vxlan_sock_release(vxlan);
2709 return ret;
2710 }
2711 }
2712
2713 if (vxlan->cfg.age_interval)
2714 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2715
2716 return ret;
2717 }
2718
2719 /* Purge the forwarding table */
2720 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2721 {
2722 unsigned int h;
2723
2724 spin_lock_bh(&vxlan->hash_lock);
2725 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2726 struct hlist_node *p, *n;
2727 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2728 struct vxlan_fdb *f
2729 = container_of(p, struct vxlan_fdb, hlist);
2730 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2731 continue;
2732 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2733 if (!is_zero_ether_addr(f->eth_addr))
2734 vxlan_fdb_destroy(vxlan, f, true, true);
2735 }
2736 }
2737 spin_unlock_bh(&vxlan->hash_lock);
2738 }
2739
2740 /* Cleanup timer and forwarding table on shutdown */
2741 static int vxlan_stop(struct net_device *dev)
2742 {
2743 struct vxlan_dev *vxlan = netdev_priv(dev);
2744 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2745 int ret = 0;
2746
2747 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2748 !vxlan_group_used(vn, vxlan))
2749 ret = vxlan_igmp_leave(vxlan);
2750
2751 del_timer_sync(&vxlan->age_timer);
2752
2753 vxlan_flush(vxlan, false);
2754 vxlan_sock_release(vxlan);
2755
2756 return ret;
2757 }
2758
2759 /* Stub, nothing needs to be done. */
2760 static void vxlan_set_multicast_list(struct net_device *dev)
2761 {
2762 }
2763
2764 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2765 {
2766 struct vxlan_dev *vxlan = netdev_priv(dev);
2767 struct vxlan_rdst *dst = &vxlan->default_dst;
2768 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2769 dst->remote_ifindex);
2770 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2771
2772 /* This check is different than dev->max_mtu, because it looks at
2773 * the lowerdev->mtu, rather than the static dev->max_mtu
2774 */
2775 if (lowerdev) {
2776 int max_mtu = lowerdev->mtu -
2777 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2778 if (new_mtu > max_mtu)
2779 return -EINVAL;
2780 }
2781
2782 dev->mtu = new_mtu;
2783 return 0;
2784 }
2785
2786 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2787 {
2788 struct vxlan_dev *vxlan = netdev_priv(dev);
2789 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2790 __be16 sport, dport;
2791
2792 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2793 vxlan->cfg.port_max, true);
2794 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2795
2796 if (ip_tunnel_info_af(info) == AF_INET) {
2797 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2798 struct rtable *rt;
2799
2800 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2801 info->key.u.ipv4.dst,
2802 &info->key.u.ipv4.src, dport, sport,
2803 &info->dst_cache, info);
2804 if (IS_ERR(rt))
2805 return PTR_ERR(rt);
2806 ip_rt_put(rt);
2807 } else {
2808 #if IS_ENABLED(CONFIG_IPV6)
2809 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2810 struct dst_entry *ndst;
2811
2812 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2813 info->key.label, &info->key.u.ipv6.dst,
2814 &info->key.u.ipv6.src, dport, sport,
2815 &info->dst_cache, info);
2816 if (IS_ERR(ndst))
2817 return PTR_ERR(ndst);
2818 dst_release(ndst);
2819 #else /* !CONFIG_IPV6 */
2820 return -EPFNOSUPPORT;
2821 #endif
2822 }
2823 info->key.tp_src = sport;
2824 info->key.tp_dst = dport;
2825 return 0;
2826 }
2827
2828 static const struct net_device_ops vxlan_netdev_ether_ops = {
2829 .ndo_init = vxlan_init,
2830 .ndo_uninit = vxlan_uninit,
2831 .ndo_open = vxlan_open,
2832 .ndo_stop = vxlan_stop,
2833 .ndo_start_xmit = vxlan_xmit,
2834 .ndo_get_stats64 = ip_tunnel_get_stats64,
2835 .ndo_set_rx_mode = vxlan_set_multicast_list,
2836 .ndo_change_mtu = vxlan_change_mtu,
2837 .ndo_validate_addr = eth_validate_addr,
2838 .ndo_set_mac_address = eth_mac_addr,
2839 .ndo_fdb_add = vxlan_fdb_add,
2840 .ndo_fdb_del = vxlan_fdb_delete,
2841 .ndo_fdb_dump = vxlan_fdb_dump,
2842 .ndo_fdb_get = vxlan_fdb_get,
2843 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2844 };
2845
2846 static const struct net_device_ops vxlan_netdev_raw_ops = {
2847 .ndo_init = vxlan_init,
2848 .ndo_uninit = vxlan_uninit,
2849 .ndo_open = vxlan_open,
2850 .ndo_stop = vxlan_stop,
2851 .ndo_start_xmit = vxlan_xmit,
2852 .ndo_get_stats64 = ip_tunnel_get_stats64,
2853 .ndo_change_mtu = vxlan_change_mtu,
2854 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2855 };
2856
2857 /* Info for udev, that this is a virtual tunnel endpoint */
2858 static struct device_type vxlan_type = {
2859 .name = "vxlan",
2860 };
2861
2862 /* Calls the ndo_udp_tunnel_add of the caller in order to
2863 * supply the listening VXLAN udp ports. Callers are expected
2864 * to implement the ndo_udp_tunnel_add.
2865 */
2866 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2867 {
2868 struct vxlan_sock *vs;
2869 struct net *net = dev_net(dev);
2870 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2871 unsigned int i;
2872
2873 spin_lock(&vn->sock_lock);
2874 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2875 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2876 unsigned short type;
2877
2878 if (vs->flags & VXLAN_F_GPE)
2879 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2880 else
2881 type = UDP_TUNNEL_TYPE_VXLAN;
2882
2883 if (push)
2884 udp_tunnel_push_rx_port(dev, vs->sock, type);
2885 else
2886 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2887 }
2888 }
2889 spin_unlock(&vn->sock_lock);
2890 }
2891
2892 /* Initialize the device structure. */
2893 static void vxlan_setup(struct net_device *dev)
2894 {
2895 struct vxlan_dev *vxlan = netdev_priv(dev);
2896 unsigned int h;
2897
2898 eth_hw_addr_random(dev);
2899 ether_setup(dev);
2900
2901 dev->needs_free_netdev = true;
2902 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2903
2904 dev->features |= NETIF_F_LLTX;
2905 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2906 dev->features |= NETIF_F_RXCSUM;
2907 dev->features |= NETIF_F_GSO_SOFTWARE;
2908
2909 dev->vlan_features = dev->features;
2910 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2911 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2912 netif_keep_dst(dev);
2913 dev->priv_flags |= IFF_NO_QUEUE;
2914
2915 /* MTU range: 68 - 65535 */
2916 dev->min_mtu = ETH_MIN_MTU;
2917 dev->max_mtu = ETH_MAX_MTU;
2918
2919 INIT_LIST_HEAD(&vxlan->next);
2920 spin_lock_init(&vxlan->hash_lock);
2921
2922 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2923
2924 vxlan->dev = dev;
2925
2926 gro_cells_init(&vxlan->gro_cells, dev);
2927
2928 for (h = 0; h < FDB_HASH_SIZE; ++h)
2929 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2930 }
2931
2932 static void vxlan_ether_setup(struct net_device *dev)
2933 {
2934 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2935 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2936 dev->netdev_ops = &vxlan_netdev_ether_ops;
2937 }
2938
2939 static void vxlan_raw_setup(struct net_device *dev)
2940 {
2941 dev->header_ops = NULL;
2942 dev->type = ARPHRD_NONE;
2943 dev->hard_header_len = 0;
2944 dev->addr_len = 0;
2945 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2946 dev->netdev_ops = &vxlan_netdev_raw_ops;
2947 }
2948
2949 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2950 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2951 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2952 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2953 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2954 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2955 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2956 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2957 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2958 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2959 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2960 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2961 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2962 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2963 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2964 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2965 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2966 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2967 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2968 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2969 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2970 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2971 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2972 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2973 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2974 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2975 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2976 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2977 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
2978 [IFLA_VXLAN_DF] = { .type = NLA_U8 },
2979 };
2980
2981 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2982 struct netlink_ext_ack *extack)
2983 {
2984 if (tb[IFLA_ADDRESS]) {
2985 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2986 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2987 "Provided link layer address is not Ethernet");
2988 return -EINVAL;
2989 }
2990
2991 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2992 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2993 "Provided Ethernet address is not unicast");
2994 return -EADDRNOTAVAIL;
2995 }
2996 }
2997
2998 if (tb[IFLA_MTU]) {
2999 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3000
3001 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3002 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3003 "MTU must be between 68 and 65535");
3004 return -EINVAL;
3005 }
3006 }
3007
3008 if (!data) {
3009 NL_SET_ERR_MSG(extack,
3010 "Required attributes not provided to perform the operation");
3011 return -EINVAL;
3012 }
3013
3014 if (data[IFLA_VXLAN_ID]) {
3015 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3016
3017 if (id >= VXLAN_N_VID) {
3018 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
3019 "VXLAN ID must be lower than 16777216");
3020 return -ERANGE;
3021 }
3022 }
3023
3024 if (data[IFLA_VXLAN_PORT_RANGE]) {
3025 const struct ifla_vxlan_port_range *p
3026 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3027
3028 if (ntohs(p->high) < ntohs(p->low)) {
3029 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3030 "Invalid source port range");
3031 return -EINVAL;
3032 }
3033 }
3034
3035 if (data[IFLA_VXLAN_DF]) {
3036 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3037
3038 if (df < 0 || df > VXLAN_DF_MAX) {
3039 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF],
3040 "Invalid DF attribute");
3041 return -EINVAL;
3042 }
3043 }
3044
3045 return 0;
3046 }
3047
3048 static void vxlan_get_drvinfo(struct net_device *netdev,
3049 struct ethtool_drvinfo *drvinfo)
3050 {
3051 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3052 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3053 }
3054
3055 static const struct ethtool_ops vxlan_ethtool_ops = {
3056 .get_drvinfo = vxlan_get_drvinfo,
3057 .get_link = ethtool_op_get_link,
3058 };
3059
3060 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3061 __be16 port, u32 flags, int ifindex)
3062 {
3063 struct socket *sock;
3064 struct udp_port_cfg udp_conf;
3065 int err;
3066
3067 memset(&udp_conf, 0, sizeof(udp_conf));
3068
3069 if (ipv6) {
3070 udp_conf.family = AF_INET6;
3071 udp_conf.use_udp6_rx_checksums =
3072 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3073 udp_conf.ipv6_v6only = 1;
3074 } else {
3075 udp_conf.family = AF_INET;
3076 }
3077
3078 udp_conf.local_udp_port = port;
3079 udp_conf.bind_ifindex = ifindex;
3080
3081 /* Open UDP socket */
3082 err = udp_sock_create(net, &udp_conf, &sock);
3083 if (err < 0)
3084 return ERR_PTR(err);
3085
3086 return sock;
3087 }
3088
3089 /* Create new listen socket if needed */
3090 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3091 __be16 port, u32 flags,
3092 int ifindex)
3093 {
3094 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3095 struct vxlan_sock *vs;
3096 struct socket *sock;
3097 unsigned int h;
3098 struct udp_tunnel_sock_cfg tunnel_cfg;
3099
3100 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3101 if (!vs)
3102 return ERR_PTR(-ENOMEM);
3103
3104 for (h = 0; h < VNI_HASH_SIZE; ++h)
3105 INIT_HLIST_HEAD(&vs->vni_list[h]);
3106
3107 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3108 if (IS_ERR(sock)) {
3109 kfree(vs);
3110 return ERR_CAST(sock);
3111 }
3112
3113 vs->sock = sock;
3114 refcount_set(&vs->refcnt, 1);
3115 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3116
3117 spin_lock(&vn->sock_lock);
3118 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3119 udp_tunnel_notify_add_rx_port(sock,
3120 (vs->flags & VXLAN_F_GPE) ?
3121 UDP_TUNNEL_TYPE_VXLAN_GPE :
3122 UDP_TUNNEL_TYPE_VXLAN);
3123 spin_unlock(&vn->sock_lock);
3124
3125 /* Mark socket as an encapsulation socket. */
3126 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3127 tunnel_cfg.sk_user_data = vs;
3128 tunnel_cfg.encap_type = 1;
3129 tunnel_cfg.encap_rcv = vxlan_rcv;
3130 tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3131 tunnel_cfg.encap_destroy = NULL;
3132 tunnel_cfg.gro_receive = vxlan_gro_receive;
3133 tunnel_cfg.gro_complete = vxlan_gro_complete;
3134
3135 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3136
3137 return vs;
3138 }
3139
3140 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3141 {
3142 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3143 struct vxlan_sock *vs = NULL;
3144 struct vxlan_dev_node *node;
3145 int l3mdev_index = 0;
3146
3147 if (vxlan->cfg.remote_ifindex)
3148 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3149 vxlan->net, vxlan->cfg.remote_ifindex);
3150
3151 if (!vxlan->cfg.no_share) {
3152 spin_lock(&vn->sock_lock);
3153 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3154 vxlan->cfg.dst_port, vxlan->cfg.flags,
3155 l3mdev_index);
3156 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3157 spin_unlock(&vn->sock_lock);
3158 return -EBUSY;
3159 }
3160 spin_unlock(&vn->sock_lock);
3161 }
3162 if (!vs)
3163 vs = vxlan_socket_create(vxlan->net, ipv6,
3164 vxlan->cfg.dst_port, vxlan->cfg.flags,
3165 l3mdev_index);
3166 if (IS_ERR(vs))
3167 return PTR_ERR(vs);
3168 #if IS_ENABLED(CONFIG_IPV6)
3169 if (ipv6) {
3170 rcu_assign_pointer(vxlan->vn6_sock, vs);
3171 node = &vxlan->hlist6;
3172 } else
3173 #endif
3174 {
3175 rcu_assign_pointer(vxlan->vn4_sock, vs);
3176 node = &vxlan->hlist4;
3177 }
3178 vxlan_vs_add_dev(vs, vxlan, node);
3179 return 0;
3180 }
3181
3182 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3183 {
3184 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3185 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3186 bool ipv4 = !ipv6 || metadata;
3187 int ret = 0;
3188
3189 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3190 #if IS_ENABLED(CONFIG_IPV6)
3191 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3192 if (ipv6) {
3193 ret = __vxlan_sock_add(vxlan, true);
3194 if (ret < 0 && ret != -EAFNOSUPPORT)
3195 ipv4 = false;
3196 }
3197 #endif
3198 if (ipv4)
3199 ret = __vxlan_sock_add(vxlan, false);
3200 if (ret < 0)
3201 vxlan_sock_release(vxlan);
3202 return ret;
3203 }
3204
3205 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3206 struct net_device **lower,
3207 struct vxlan_dev *old,
3208 struct netlink_ext_ack *extack)
3209 {
3210 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3211 struct vxlan_dev *tmp;
3212 bool use_ipv6 = false;
3213
3214 if (conf->flags & VXLAN_F_GPE) {
3215 /* For now, allow GPE only together with
3216 * COLLECT_METADATA. This can be relaxed later; in such
3217 * case, the other side of the PtP link will have to be
3218 * provided.
3219 */
3220 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3221 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3222 NL_SET_ERR_MSG(extack,
3223 "VXLAN GPE does not support this combination of attributes");
3224 return -EINVAL;
3225 }
3226 }
3227
3228 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3229 /* Unless IPv6 is explicitly requested, assume IPv4 */
3230 conf->remote_ip.sa.sa_family = AF_INET;
3231 conf->saddr.sa.sa_family = AF_INET;
3232 } else if (!conf->remote_ip.sa.sa_family) {
3233 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3234 } else if (!conf->saddr.sa.sa_family) {
3235 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3236 }
3237
3238 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3239 NL_SET_ERR_MSG(extack,
3240 "Local and remote address must be from the same family");
3241 return -EINVAL;
3242 }
3243
3244 if (vxlan_addr_multicast(&conf->saddr)) {
3245 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3246 return -EINVAL;
3247 }
3248
3249 if (conf->saddr.sa.sa_family == AF_INET6) {
3250 if (!IS_ENABLED(CONFIG_IPV6)) {
3251 NL_SET_ERR_MSG(extack,
3252 "IPv6 support not enabled in the kernel");
3253 return -EPFNOSUPPORT;
3254 }
3255 use_ipv6 = true;
3256 conf->flags |= VXLAN_F_IPV6;
3257
3258 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3259 int local_type =
3260 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3261 int remote_type =
3262 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3263
3264 if (local_type & IPV6_ADDR_LINKLOCAL) {
3265 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3266 (remote_type != IPV6_ADDR_ANY)) {
3267 NL_SET_ERR_MSG(extack,
3268 "Invalid combination of local and remote address scopes");
3269 return -EINVAL;
3270 }
3271
3272 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3273 } else {
3274 if (remote_type ==
3275 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3276 NL_SET_ERR_MSG(extack,
3277 "Invalid combination of local and remote address scopes");
3278 return -EINVAL;
3279 }
3280
3281 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3282 }
3283 }
3284 }
3285
3286 if (conf->label && !use_ipv6) {
3287 NL_SET_ERR_MSG(extack,
3288 "Label attribute only applies to IPv6 VXLAN devices");
3289 return -EINVAL;
3290 }
3291
3292 if (conf->remote_ifindex) {
3293 struct net_device *lowerdev;
3294
3295 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3296 if (!lowerdev) {
3297 NL_SET_ERR_MSG(extack,
3298 "Invalid local interface, device not found");
3299 return -ENODEV;
3300 }
3301
3302 #if IS_ENABLED(CONFIG_IPV6)
3303 if (use_ipv6) {
3304 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3305 if (idev && idev->cnf.disable_ipv6) {
3306 NL_SET_ERR_MSG(extack,
3307 "IPv6 support disabled by administrator");
3308 return -EPERM;
3309 }
3310 }
3311 #endif
3312
3313 *lower = lowerdev;
3314 } else {
3315 if (vxlan_addr_multicast(&conf->remote_ip)) {
3316 NL_SET_ERR_MSG(extack,
3317 "Local interface required for multicast remote destination");
3318
3319 return -EINVAL;
3320 }
3321
3322 #if IS_ENABLED(CONFIG_IPV6)
3323 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3324 NL_SET_ERR_MSG(extack,
3325 "Local interface required for link-local local/remote addresses");
3326 return -EINVAL;
3327 }
3328 #endif
3329
3330 *lower = NULL;
3331 }
3332
3333 if (!conf->dst_port) {
3334 if (conf->flags & VXLAN_F_GPE)
3335 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3336 else
3337 conf->dst_port = htons(vxlan_port);
3338 }
3339
3340 if (!conf->age_interval)
3341 conf->age_interval = FDB_AGE_DEFAULT;
3342
3343 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3344 if (tmp == old)
3345 continue;
3346
3347 if (tmp->cfg.vni != conf->vni)
3348 continue;
3349 if (tmp->cfg.dst_port != conf->dst_port)
3350 continue;
3351 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3352 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3353 continue;
3354
3355 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3356 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3357 continue;
3358
3359 NL_SET_ERR_MSG(extack,
3360 "A VXLAN device with the specified VNI already exists");
3361 return -EEXIST;
3362 }
3363
3364 return 0;
3365 }
3366
3367 static void vxlan_config_apply(struct net_device *dev,
3368 struct vxlan_config *conf,
3369 struct net_device *lowerdev,
3370 struct net *src_net,
3371 bool changelink)
3372 {
3373 struct vxlan_dev *vxlan = netdev_priv(dev);
3374 struct vxlan_rdst *dst = &vxlan->default_dst;
3375 unsigned short needed_headroom = ETH_HLEN;
3376 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3377 int max_mtu = ETH_MAX_MTU;
3378
3379 if (!changelink) {
3380 if (conf->flags & VXLAN_F_GPE)
3381 vxlan_raw_setup(dev);
3382 else
3383 vxlan_ether_setup(dev);
3384
3385 if (conf->mtu)
3386 dev->mtu = conf->mtu;
3387
3388 vxlan->net = src_net;
3389 }
3390
3391 dst->remote_vni = conf->vni;
3392
3393 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3394
3395 if (lowerdev) {
3396 dst->remote_ifindex = conf->remote_ifindex;
3397
3398 dev->gso_max_size = lowerdev->gso_max_size;
3399 dev->gso_max_segs = lowerdev->gso_max_segs;
3400
3401 needed_headroom = lowerdev->hard_header_len;
3402
3403 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3404 VXLAN_HEADROOM);
3405 if (max_mtu < ETH_MIN_MTU)
3406 max_mtu = ETH_MIN_MTU;
3407
3408 if (!changelink && !conf->mtu)
3409 dev->mtu = max_mtu;
3410 }
3411
3412 if (dev->mtu > max_mtu)
3413 dev->mtu = max_mtu;
3414
3415 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3416 needed_headroom += VXLAN6_HEADROOM;
3417 else
3418 needed_headroom += VXLAN_HEADROOM;
3419 dev->needed_headroom = needed_headroom;
3420
3421 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3422 }
3423
3424 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3425 struct vxlan_config *conf, bool changelink,
3426 struct netlink_ext_ack *extack)
3427 {
3428 struct vxlan_dev *vxlan = netdev_priv(dev);
3429 struct net_device *lowerdev;
3430 int ret;
3431
3432 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3433 if (ret)
3434 return ret;
3435
3436 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3437
3438 return 0;
3439 }
3440
3441 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3442 struct vxlan_config *conf,
3443 struct netlink_ext_ack *extack)
3444 {
3445 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3446 struct vxlan_dev *vxlan = netdev_priv(dev);
3447 struct vxlan_fdb *f = NULL;
3448 bool unregister = false;
3449 int err;
3450
3451 err = vxlan_dev_configure(net, dev, conf, false, extack);
3452 if (err)
3453 return err;
3454
3455 dev->ethtool_ops = &vxlan_ethtool_ops;
3456
3457 /* create an fdb entry for a valid default destination */
3458 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3459 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3460 &vxlan->default_dst.remote_ip,
3461 NUD_REACHABLE | NUD_PERMANENT,
3462 vxlan->cfg.dst_port,
3463 vxlan->default_dst.remote_vni,
3464 vxlan->default_dst.remote_vni,
3465 vxlan->default_dst.remote_ifindex,
3466 NTF_SELF, &f);
3467 if (err)
3468 return err;
3469 }
3470
3471 err = register_netdevice(dev);
3472 if (err)
3473 goto errout;
3474 unregister = true;
3475
3476 err = rtnl_configure_link(dev, NULL);
3477 if (err)
3478 goto errout;
3479
3480 /* notify default fdb entry */
3481 if (f)
3482 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
3483 true);
3484
3485 list_add(&vxlan->next, &vn->vxlan_list);
3486 return 0;
3487
3488 errout:
3489 /* unregister_netdevice() destroys the default FDB entry with deletion
3490 * notification. But the addition notification was not sent yet, so
3491 * destroy the entry by hand here.
3492 */
3493 if (f)
3494 vxlan_fdb_destroy(vxlan, f, false, false);
3495 if (unregister)
3496 unregister_netdevice(dev);
3497 return err;
3498 }
3499
3500 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3501 struct net_device *dev, struct vxlan_config *conf,
3502 bool changelink)
3503 {
3504 struct vxlan_dev *vxlan = netdev_priv(dev);
3505
3506 memset(conf, 0, sizeof(*conf));
3507
3508 /* if changelink operation, start with old existing cfg */
3509 if (changelink)
3510 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3511
3512 if (data[IFLA_VXLAN_ID]) {
3513 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3514
3515 if (changelink && (vni != conf->vni))
3516 return -EOPNOTSUPP;
3517 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3518 }
3519
3520 if (data[IFLA_VXLAN_GROUP]) {
3521 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3522 return -EOPNOTSUPP;
3523
3524 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3525 conf->remote_ip.sa.sa_family = AF_INET;
3526 } else if (data[IFLA_VXLAN_GROUP6]) {
3527 if (!IS_ENABLED(CONFIG_IPV6))
3528 return -EPFNOSUPPORT;
3529
3530 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3531 return -EOPNOTSUPP;
3532
3533 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3534 conf->remote_ip.sa.sa_family = AF_INET6;
3535 }
3536
3537 if (data[IFLA_VXLAN_LOCAL]) {
3538 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3539 return -EOPNOTSUPP;
3540
3541 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3542 conf->saddr.sa.sa_family = AF_INET;
3543 } else if (data[IFLA_VXLAN_LOCAL6]) {
3544 if (!IS_ENABLED(CONFIG_IPV6))
3545 return -EPFNOSUPPORT;
3546
3547 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3548 return -EOPNOTSUPP;
3549
3550 /* TODO: respect scope id */
3551 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3552 conf->saddr.sa.sa_family = AF_INET6;
3553 }
3554
3555 if (data[IFLA_VXLAN_LINK])
3556 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3557
3558 if (data[IFLA_VXLAN_TOS])
3559 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3560
3561 if (data[IFLA_VXLAN_TTL])
3562 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3563
3564 if (data[IFLA_VXLAN_TTL_INHERIT]) {
3565 if (changelink)
3566 return -EOPNOTSUPP;
3567 conf->flags |= VXLAN_F_TTL_INHERIT;
3568 }
3569
3570 if (data[IFLA_VXLAN_LABEL])
3571 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3572 IPV6_FLOWLABEL_MASK;
3573
3574 if (data[IFLA_VXLAN_LEARNING]) {
3575 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3576 conf->flags |= VXLAN_F_LEARN;
3577 else
3578 conf->flags &= ~VXLAN_F_LEARN;
3579 } else if (!changelink) {
3580 /* default to learn on a new device */
3581 conf->flags |= VXLAN_F_LEARN;
3582 }
3583
3584 if (data[IFLA_VXLAN_AGEING])
3585 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3586
3587 if (data[IFLA_VXLAN_PROXY]) {
3588 if (changelink)
3589 return -EOPNOTSUPP;
3590 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3591 conf->flags |= VXLAN_F_PROXY;
3592 }
3593
3594 if (data[IFLA_VXLAN_RSC]) {
3595 if (changelink)
3596 return -EOPNOTSUPP;
3597 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3598 conf->flags |= VXLAN_F_RSC;
3599 }
3600
3601 if (data[IFLA_VXLAN_L2MISS]) {
3602 if (changelink)
3603 return -EOPNOTSUPP;
3604 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3605 conf->flags |= VXLAN_F_L2MISS;
3606 }
3607
3608 if (data[IFLA_VXLAN_L3MISS]) {
3609 if (changelink)
3610 return -EOPNOTSUPP;
3611 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3612 conf->flags |= VXLAN_F_L3MISS;
3613 }
3614
3615 if (data[IFLA_VXLAN_LIMIT]) {
3616 if (changelink)
3617 return -EOPNOTSUPP;
3618 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3619 }
3620
3621 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3622 if (changelink)
3623 return -EOPNOTSUPP;
3624 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3625 conf->flags |= VXLAN_F_COLLECT_METADATA;
3626 }
3627
3628 if (data[IFLA_VXLAN_PORT_RANGE]) {
3629 if (!changelink) {
3630 const struct ifla_vxlan_port_range *p
3631 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3632 conf->port_min = ntohs(p->low);
3633 conf->port_max = ntohs(p->high);
3634 } else {
3635 return -EOPNOTSUPP;
3636 }
3637 }
3638
3639 if (data[IFLA_VXLAN_PORT]) {
3640 if (changelink)
3641 return -EOPNOTSUPP;
3642 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3643 }
3644
3645 if (data[IFLA_VXLAN_UDP_CSUM]) {
3646 if (changelink)
3647 return -EOPNOTSUPP;
3648 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3649 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3650 }
3651
3652 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3653 if (changelink)
3654 return -EOPNOTSUPP;
3655 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3656 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3657 }
3658
3659 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3660 if (changelink)
3661 return -EOPNOTSUPP;
3662 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3663 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3664 }
3665
3666 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3667 if (changelink)
3668 return -EOPNOTSUPP;
3669 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3670 conf->flags |= VXLAN_F_REMCSUM_TX;
3671 }
3672
3673 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3674 if (changelink)
3675 return -EOPNOTSUPP;
3676 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3677 conf->flags |= VXLAN_F_REMCSUM_RX;
3678 }
3679
3680 if (data[IFLA_VXLAN_GBP]) {
3681 if (changelink)
3682 return -EOPNOTSUPP;
3683 conf->flags |= VXLAN_F_GBP;
3684 }
3685
3686 if (data[IFLA_VXLAN_GPE]) {
3687 if (changelink)
3688 return -EOPNOTSUPP;
3689 conf->flags |= VXLAN_F_GPE;
3690 }
3691
3692 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3693 if (changelink)
3694 return -EOPNOTSUPP;
3695 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3696 }
3697
3698 if (tb[IFLA_MTU]) {
3699 if (changelink)
3700 return -EOPNOTSUPP;
3701 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3702 }
3703
3704 if (data[IFLA_VXLAN_DF])
3705 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
3706
3707 return 0;
3708 }
3709
3710 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3711 struct nlattr *tb[], struct nlattr *data[],
3712 struct netlink_ext_ack *extack)
3713 {
3714 struct vxlan_config conf;
3715 int err;
3716
3717 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3718 if (err)
3719 return err;
3720
3721 return __vxlan_dev_create(src_net, dev, &conf, extack);
3722 }
3723
3724 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3725 struct nlattr *data[],
3726 struct netlink_ext_ack *extack)
3727 {
3728 struct vxlan_dev *vxlan = netdev_priv(dev);
3729 struct vxlan_rdst *dst = &vxlan->default_dst;
3730 unsigned long old_age_interval;
3731 struct vxlan_rdst old_dst;
3732 struct vxlan_config conf;
3733 int err;
3734
3735 err = vxlan_nl2conf(tb, data,
3736 dev, &conf, true);
3737 if (err)
3738 return err;
3739
3740 old_age_interval = vxlan->cfg.age_interval;
3741 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3742
3743 err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3744 if (err)
3745 return err;
3746
3747 if (old_age_interval != vxlan->cfg.age_interval)
3748 mod_timer(&vxlan->age_timer, jiffies);
3749
3750 /* handle default dst entry */
3751 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3752 spin_lock_bh(&vxlan->hash_lock);
3753 if (!vxlan_addr_any(&old_dst.remote_ip))
3754 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3755 old_dst.remote_ip,
3756 vxlan->cfg.dst_port,
3757 old_dst.remote_vni,
3758 old_dst.remote_vni,
3759 old_dst.remote_ifindex,
3760 true);
3761
3762 if (!vxlan_addr_any(&dst->remote_ip)) {
3763 err = vxlan_fdb_update(vxlan, all_zeros_mac,
3764 &dst->remote_ip,
3765 NUD_REACHABLE | NUD_PERMANENT,
3766 NLM_F_APPEND | NLM_F_CREATE,
3767 vxlan->cfg.dst_port,
3768 dst->remote_vni,
3769 dst->remote_vni,
3770 dst->remote_ifindex,
3771 NTF_SELF, true);
3772 if (err) {
3773 spin_unlock_bh(&vxlan->hash_lock);
3774 return err;
3775 }
3776 }
3777 spin_unlock_bh(&vxlan->hash_lock);
3778 }
3779
3780 return 0;
3781 }
3782
3783 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3784 {
3785 struct vxlan_dev *vxlan = netdev_priv(dev);
3786
3787 vxlan_flush(vxlan, true);
3788
3789 gro_cells_destroy(&vxlan->gro_cells);
3790 list_del(&vxlan->next);
3791 unregister_netdevice_queue(dev, head);
3792 }
3793
3794 static size_t vxlan_get_size(const struct net_device *dev)
3795 {
3796
3797 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3798 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3799 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3800 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3801 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3802 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
3803 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3804 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
3805 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3806 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3807 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3808 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3809 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3810 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3811 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3812 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3813 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3814 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3815 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3816 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3817 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3818 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3819 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3820 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3821 0;
3822 }
3823
3824 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3825 {
3826 const struct vxlan_dev *vxlan = netdev_priv(dev);
3827 const struct vxlan_rdst *dst = &vxlan->default_dst;
3828 struct ifla_vxlan_port_range ports = {
3829 .low = htons(vxlan->cfg.port_min),
3830 .high = htons(vxlan->cfg.port_max),
3831 };
3832
3833 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3834 goto nla_put_failure;
3835
3836 if (!vxlan_addr_any(&dst->remote_ip)) {
3837 if (dst->remote_ip.sa.sa_family == AF_INET) {
3838 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3839 dst->remote_ip.sin.sin_addr.s_addr))
3840 goto nla_put_failure;
3841 #if IS_ENABLED(CONFIG_IPV6)
3842 } else {
3843 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3844 &dst->remote_ip.sin6.sin6_addr))
3845 goto nla_put_failure;
3846 #endif
3847 }
3848 }
3849
3850 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3851 goto nla_put_failure;
3852
3853 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3854 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3855 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3856 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3857 goto nla_put_failure;
3858 #if IS_ENABLED(CONFIG_IPV6)
3859 } else {
3860 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3861 &vxlan->cfg.saddr.sin6.sin6_addr))
3862 goto nla_put_failure;
3863 #endif
3864 }
3865 }
3866
3867 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3868 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
3869 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
3870 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3871 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
3872 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3873 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3874 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3875 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3876 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3877 nla_put_u8(skb, IFLA_VXLAN_RSC,
3878 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3879 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3880 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3881 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3882 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3883 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3884 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3885 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3886 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3887 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3888 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3889 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3890 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3891 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3892 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3893 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3894 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3895 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3896 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3897 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3898 goto nla_put_failure;
3899
3900 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3901 goto nla_put_failure;
3902
3903 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3904 nla_put_flag(skb, IFLA_VXLAN_GBP))
3905 goto nla_put_failure;
3906
3907 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3908 nla_put_flag(skb, IFLA_VXLAN_GPE))
3909 goto nla_put_failure;
3910
3911 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3912 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3913 goto nla_put_failure;
3914
3915 return 0;
3916
3917 nla_put_failure:
3918 return -EMSGSIZE;
3919 }
3920
3921 static struct net *vxlan_get_link_net(const struct net_device *dev)
3922 {
3923 struct vxlan_dev *vxlan = netdev_priv(dev);
3924
3925 return vxlan->net;
3926 }
3927
3928 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3929 .kind = "vxlan",
3930 .maxtype = IFLA_VXLAN_MAX,
3931 .policy = vxlan_policy,
3932 .priv_size = sizeof(struct vxlan_dev),
3933 .setup = vxlan_setup,
3934 .validate = vxlan_validate,
3935 .newlink = vxlan_newlink,
3936 .changelink = vxlan_changelink,
3937 .dellink = vxlan_dellink,
3938 .get_size = vxlan_get_size,
3939 .fill_info = vxlan_fill_info,
3940 .get_link_net = vxlan_get_link_net,
3941 };
3942
3943 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3944 u8 name_assign_type,
3945 struct vxlan_config *conf)
3946 {
3947 struct nlattr *tb[IFLA_MAX + 1];
3948 struct net_device *dev;
3949 int err;
3950
3951 memset(&tb, 0, sizeof(tb));
3952
3953 dev = rtnl_create_link(net, name, name_assign_type,
3954 &vxlan_link_ops, tb, NULL);
3955 if (IS_ERR(dev))
3956 return dev;
3957
3958 err = __vxlan_dev_create(net, dev, conf, NULL);
3959 if (err < 0) {
3960 free_netdev(dev);
3961 return ERR_PTR(err);
3962 }
3963
3964 err = rtnl_configure_link(dev, NULL);
3965 if (err < 0) {
3966 LIST_HEAD(list_kill);
3967
3968 vxlan_dellink(dev, &list_kill);
3969 unregister_netdevice_many(&list_kill);
3970 return ERR_PTR(err);
3971 }
3972
3973 return dev;
3974 }
3975 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3976
3977 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3978 struct net_device *dev)
3979 {
3980 struct vxlan_dev *vxlan, *next;
3981 LIST_HEAD(list_kill);
3982
3983 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3984 struct vxlan_rdst *dst = &vxlan->default_dst;
3985
3986 /* In case we created vxlan device with carrier
3987 * and we loose the carrier due to module unload
3988 * we also need to remove vxlan device. In other
3989 * cases, it's not necessary and remote_ifindex
3990 * is 0 here, so no matches.
3991 */
3992 if (dst->remote_ifindex == dev->ifindex)
3993 vxlan_dellink(vxlan->dev, &list_kill);
3994 }
3995
3996 unregister_netdevice_many(&list_kill);
3997 }
3998
3999 static int vxlan_netdevice_event(struct notifier_block *unused,
4000 unsigned long event, void *ptr)
4001 {
4002 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4003 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4004
4005 if (event == NETDEV_UNREGISTER) {
4006 vxlan_offload_rx_ports(dev, false);
4007 vxlan_handle_lowerdev_unregister(vn, dev);
4008 } else if (event == NETDEV_REGISTER) {
4009 vxlan_offload_rx_ports(dev, true);
4010 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4011 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4012 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4013 }
4014
4015 return NOTIFY_DONE;
4016 }
4017
4018 static struct notifier_block vxlan_notifier_block __read_mostly = {
4019 .notifier_call = vxlan_netdevice_event,
4020 };
4021
4022 static void
4023 vxlan_fdb_offloaded_set(struct net_device *dev,
4024 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4025 {
4026 struct vxlan_dev *vxlan = netdev_priv(dev);
4027 struct vxlan_rdst *rdst;
4028 struct vxlan_fdb *f;
4029
4030 spin_lock_bh(&vxlan->hash_lock);
4031
4032 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4033 if (!f)
4034 goto out;
4035
4036 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4037 fdb_info->remote_port,
4038 fdb_info->remote_vni,
4039 fdb_info->remote_ifindex);
4040 if (!rdst)
4041 goto out;
4042
4043 rdst->offloaded = fdb_info->offloaded;
4044
4045 out:
4046 spin_unlock_bh(&vxlan->hash_lock);
4047 }
4048
4049 static int
4050 vxlan_fdb_external_learn_add(struct net_device *dev,
4051 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4052 {
4053 struct vxlan_dev *vxlan = netdev_priv(dev);
4054 int err;
4055
4056 spin_lock_bh(&vxlan->hash_lock);
4057 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4058 NUD_REACHABLE,
4059 NLM_F_CREATE | NLM_F_REPLACE,
4060 fdb_info->remote_port,
4061 fdb_info->vni,
4062 fdb_info->remote_vni,
4063 fdb_info->remote_ifindex,
4064 NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4065 false);
4066 spin_unlock_bh(&vxlan->hash_lock);
4067
4068 return err;
4069 }
4070
4071 static int
4072 vxlan_fdb_external_learn_del(struct net_device *dev,
4073 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4074 {
4075 struct vxlan_dev *vxlan = netdev_priv(dev);
4076 struct vxlan_fdb *f;
4077 int err = 0;
4078
4079 spin_lock_bh(&vxlan->hash_lock);
4080
4081 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4082 if (!f)
4083 err = -ENOENT;
4084 else if (f->flags & NTF_EXT_LEARNED)
4085 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4086 fdb_info->remote_ip,
4087 fdb_info->remote_port,
4088 fdb_info->vni,
4089 fdb_info->remote_vni,
4090 fdb_info->remote_ifindex,
4091 false);
4092
4093 spin_unlock_bh(&vxlan->hash_lock);
4094
4095 return err;
4096 }
4097
4098 static int vxlan_switchdev_event(struct notifier_block *unused,
4099 unsigned long event, void *ptr)
4100 {
4101 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4102 struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4103 int err = 0;
4104
4105 switch (event) {
4106 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4107 vxlan_fdb_offloaded_set(dev, ptr);
4108 break;
4109 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4110 fdb_info = ptr;
4111 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4112 if (err) {
4113 err = notifier_from_errno(err);
4114 break;
4115 }
4116 fdb_info->offloaded = true;
4117 vxlan_fdb_offloaded_set(dev, fdb_info);
4118 break;
4119 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4120 fdb_info = ptr;
4121 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4122 if (err) {
4123 err = notifier_from_errno(err);
4124 break;
4125 }
4126 fdb_info->offloaded = false;
4127 vxlan_fdb_offloaded_set(dev, fdb_info);
4128 break;
4129 }
4130
4131 return err;
4132 }
4133
4134 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4135 .notifier_call = vxlan_switchdev_event,
4136 };
4137
4138 static __net_init int vxlan_init_net(struct net *net)
4139 {
4140 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4141 unsigned int h;
4142
4143 INIT_LIST_HEAD(&vn->vxlan_list);
4144 spin_lock_init(&vn->sock_lock);
4145
4146 for (h = 0; h < PORT_HASH_SIZE; ++h)
4147 INIT_HLIST_HEAD(&vn->sock_list[h]);
4148
4149 return 0;
4150 }
4151
4152 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4153 {
4154 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4155 struct vxlan_dev *vxlan, *next;
4156 struct net_device *dev, *aux;
4157 unsigned int h;
4158
4159 for_each_netdev_safe(net, dev, aux)
4160 if (dev->rtnl_link_ops == &vxlan_link_ops)
4161 unregister_netdevice_queue(dev, head);
4162
4163 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4164 /* If vxlan->dev is in the same netns, it has already been added
4165 * to the list by the previous loop.
4166 */
4167 if (!net_eq(dev_net(vxlan->dev), net)) {
4168 gro_cells_destroy(&vxlan->gro_cells);
4169 unregister_netdevice_queue(vxlan->dev, head);
4170 }
4171 }
4172
4173 for (h = 0; h < PORT_HASH_SIZE; ++h)
4174 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4175 }
4176
4177 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4178 {
4179 struct net *net;
4180 LIST_HEAD(list);
4181
4182 rtnl_lock();
4183 list_for_each_entry(net, net_list, exit_list)
4184 vxlan_destroy_tunnels(net, &list);
4185
4186 unregister_netdevice_many(&list);
4187 rtnl_unlock();
4188 }
4189
4190 static struct pernet_operations vxlan_net_ops = {
4191 .init = vxlan_init_net,
4192 .exit_batch = vxlan_exit_batch_net,
4193 .id = &vxlan_net_id,
4194 .size = sizeof(struct vxlan_net),
4195 };
4196
4197 static int __init vxlan_init_module(void)
4198 {
4199 int rc;
4200
4201 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4202
4203 rc = register_pernet_subsys(&vxlan_net_ops);
4204 if (rc)
4205 goto out1;
4206
4207 rc = register_netdevice_notifier(&vxlan_notifier_block);
4208 if (rc)
4209 goto out2;
4210
4211 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4212 if (rc)
4213 goto out3;
4214
4215 rc = rtnl_link_register(&vxlan_link_ops);
4216 if (rc)
4217 goto out4;
4218
4219 return 0;
4220 out4:
4221 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4222 out3:
4223 unregister_netdevice_notifier(&vxlan_notifier_block);
4224 out2:
4225 unregister_pernet_subsys(&vxlan_net_ops);
4226 out1:
4227 return rc;
4228 }
4229 late_initcall(vxlan_init_module);
4230
4231 static void __exit vxlan_cleanup_module(void)
4232 {
4233 rtnl_link_unregister(&vxlan_link_ops);
4234 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4235 unregister_netdevice_notifier(&vxlan_notifier_block);
4236 unregister_pernet_subsys(&vxlan_net_ops);
4237 /* rcu_barrier() is called by netns */
4238 }
4239 module_exit(vxlan_cleanup_module);
4240
4241 MODULE_LICENSE("GPL");
4242 MODULE_VERSION(VXLAN_VERSION);
4243 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4244 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4245 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support