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Merge remote-tracking branches 'asoc/fix/arizona', 'asoc/fix/fmtbit', 'asoc/fix/intel...
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
47 #include <net/ipv6.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
51 #endif
52
53 #define VXLAN_VERSION "0.1"
54
55 #define PORT_HASH_BITS 8
56 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
57 #define VNI_HASH_BITS 10
58 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59 #define FDB_HASH_BITS 8
60 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61 #define FDB_AGE_DEFAULT 300 /* 5 min */
62 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
63
64 /* UDP port for VXLAN traffic.
65 * The IANA assigned port is 4789, but the Linux default is 8472
66 * for compatibility with early adopters.
67 */
68 static unsigned short vxlan_port __read_mostly = 8472;
69 module_param_named(udp_port, vxlan_port, ushort, 0444);
70 MODULE_PARM_DESC(udp_port, "Destination UDP port");
71
72 static bool log_ecn_error = true;
73 module_param(log_ecn_error, bool, 0644);
74 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
75
76 static int vxlan_net_id;
77
78 static const u8 all_zeros_mac[ETH_ALEN];
79
80 /* per-network namespace private data for this module */
81 struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
84 spinlock_t sock_lock;
85 };
86
87 union vxlan_addr {
88 struct sockaddr_in sin;
89 struct sockaddr_in6 sin6;
90 struct sockaddr sa;
91 };
92
93 struct vxlan_rdst {
94 union vxlan_addr remote_ip;
95 __be16 remote_port;
96 u32 remote_vni;
97 u32 remote_ifindex;
98 struct list_head list;
99 struct rcu_head rcu;
100 };
101
102 /* Forwarding table entry */
103 struct vxlan_fdb {
104 struct hlist_node hlist; /* linked list of entries */
105 struct rcu_head rcu;
106 unsigned long updated; /* jiffies */
107 unsigned long used;
108 struct list_head remotes;
109 u16 state; /* see ndm_state */
110 u8 flags; /* see ndm_flags */
111 u8 eth_addr[ETH_ALEN];
112 };
113
114 /* Pseudo network device */
115 struct vxlan_dev {
116 struct hlist_node hlist; /* vni hash table */
117 struct list_head next; /* vxlan's per namespace list */
118 struct vxlan_sock *vn_sock; /* listening socket */
119 struct net_device *dev;
120 struct net *net; /* netns for packet i/o */
121 struct vxlan_rdst default_dst; /* default destination */
122 union vxlan_addr saddr; /* source address */
123 __be16 dst_port;
124 __u16 port_min; /* source port range */
125 __u16 port_max;
126 __u8 tos; /* TOS override */
127 __u8 ttl;
128 u32 flags; /* VXLAN_F_* in vxlan.h */
129
130 unsigned long age_interval;
131 struct timer_list age_timer;
132 spinlock_t hash_lock;
133 unsigned int addrcnt;
134 unsigned int addrmax;
135
136 struct hlist_head fdb_head[FDB_HASH_SIZE];
137 };
138
139 /* salt for hash table */
140 static u32 vxlan_salt __read_mostly;
141 static struct workqueue_struct *vxlan_wq;
142
143 #if IS_ENABLED(CONFIG_IPV6)
144 static inline
145 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
146 {
147 if (a->sa.sa_family != b->sa.sa_family)
148 return false;
149 if (a->sa.sa_family == AF_INET6)
150 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
151 else
152 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
153 }
154
155 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
156 {
157 if (ipa->sa.sa_family == AF_INET6)
158 return ipv6_addr_any(&ipa->sin6.sin6_addr);
159 else
160 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
161 }
162
163 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
164 {
165 if (ipa->sa.sa_family == AF_INET6)
166 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
167 else
168 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
169 }
170
171 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
172 {
173 if (nla_len(nla) >= sizeof(struct in6_addr)) {
174 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
175 ip->sa.sa_family = AF_INET6;
176 return 0;
177 } else if (nla_len(nla) >= sizeof(__be32)) {
178 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
179 ip->sa.sa_family = AF_INET;
180 return 0;
181 } else {
182 return -EAFNOSUPPORT;
183 }
184 }
185
186 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
187 const union vxlan_addr *ip)
188 {
189 if (ip->sa.sa_family == AF_INET6)
190 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
191 else
192 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
193 }
194
195 #else /* !CONFIG_IPV6 */
196
197 static inline
198 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
199 {
200 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
201 }
202
203 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
204 {
205 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
206 }
207
208 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
209 {
210 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
211 }
212
213 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
214 {
215 if (nla_len(nla) >= sizeof(struct in6_addr)) {
216 return -EAFNOSUPPORT;
217 } else if (nla_len(nla) >= sizeof(__be32)) {
218 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
219 ip->sa.sa_family = AF_INET;
220 return 0;
221 } else {
222 return -EAFNOSUPPORT;
223 }
224 }
225
226 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
227 const union vxlan_addr *ip)
228 {
229 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
230 }
231 #endif
232
233 /* Virtual Network hash table head */
234 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
235 {
236 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
237 }
238
239 /* Socket hash table head */
240 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
241 {
242 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
243
244 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
245 }
246
247 /* First remote destination for a forwarding entry.
248 * Guaranteed to be non-NULL because remotes are never deleted.
249 */
250 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
251 {
252 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
253 }
254
255 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
256 {
257 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
258 }
259
260 /* Find VXLAN socket based on network namespace, address family and UDP port
261 * and enabled unshareable flags.
262 */
263 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
264 __be16 port, u32 flags)
265 {
266 struct vxlan_sock *vs;
267
268 flags &= VXLAN_F_RCV_FLAGS;
269
270 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
271 if (inet_sk(vs->sock->sk)->inet_sport == port &&
272 inet_sk(vs->sock->sk)->sk.sk_family == family &&
273 vs->flags == flags)
274 return vs;
275 }
276 return NULL;
277 }
278
279 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
280 {
281 struct vxlan_dev *vxlan;
282
283 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
284 if (vxlan->default_dst.remote_vni == id)
285 return vxlan;
286 }
287
288 return NULL;
289 }
290
291 /* Look up VNI in a per net namespace table */
292 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
293 sa_family_t family, __be16 port,
294 u32 flags)
295 {
296 struct vxlan_sock *vs;
297
298 vs = vxlan_find_sock(net, family, port, flags);
299 if (!vs)
300 return NULL;
301
302 return vxlan_vs_find_vni(vs, id);
303 }
304
305 /* Fill in neighbour message in skbuff. */
306 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
307 const struct vxlan_fdb *fdb,
308 u32 portid, u32 seq, int type, unsigned int flags,
309 const struct vxlan_rdst *rdst)
310 {
311 unsigned long now = jiffies;
312 struct nda_cacheinfo ci;
313 struct nlmsghdr *nlh;
314 struct ndmsg *ndm;
315 bool send_ip, send_eth;
316
317 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
318 if (nlh == NULL)
319 return -EMSGSIZE;
320
321 ndm = nlmsg_data(nlh);
322 memset(ndm, 0, sizeof(*ndm));
323
324 send_eth = send_ip = true;
325
326 if (type == RTM_GETNEIGH) {
327 ndm->ndm_family = AF_INET;
328 send_ip = !vxlan_addr_any(&rdst->remote_ip);
329 send_eth = !is_zero_ether_addr(fdb->eth_addr);
330 } else
331 ndm->ndm_family = AF_BRIDGE;
332 ndm->ndm_state = fdb->state;
333 ndm->ndm_ifindex = vxlan->dev->ifindex;
334 ndm->ndm_flags = fdb->flags;
335 ndm->ndm_type = RTN_UNICAST;
336
337 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
338 nla_put_s32(skb, NDA_LINK_NETNSID,
339 peernet2id(dev_net(vxlan->dev), vxlan->net)))
340 goto nla_put_failure;
341
342 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
343 goto nla_put_failure;
344
345 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
346 goto nla_put_failure;
347
348 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
349 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
350 goto nla_put_failure;
351 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
352 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
353 goto nla_put_failure;
354 if (rdst->remote_ifindex &&
355 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
356 goto nla_put_failure;
357
358 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
359 ci.ndm_confirmed = 0;
360 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
361 ci.ndm_refcnt = 0;
362
363 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
364 goto nla_put_failure;
365
366 nlmsg_end(skb, nlh);
367 return 0;
368
369 nla_put_failure:
370 nlmsg_cancel(skb, nlh);
371 return -EMSGSIZE;
372 }
373
374 static inline size_t vxlan_nlmsg_size(void)
375 {
376 return NLMSG_ALIGN(sizeof(struct ndmsg))
377 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
378 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
379 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
380 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
381 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
382 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
383 + nla_total_size(sizeof(struct nda_cacheinfo));
384 }
385
386 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
387 struct vxlan_rdst *rd, int type)
388 {
389 struct net *net = dev_net(vxlan->dev);
390 struct sk_buff *skb;
391 int err = -ENOBUFS;
392
393 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
394 if (skb == NULL)
395 goto errout;
396
397 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
398 if (err < 0) {
399 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
400 WARN_ON(err == -EMSGSIZE);
401 kfree_skb(skb);
402 goto errout;
403 }
404
405 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
406 return;
407 errout:
408 if (err < 0)
409 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
410 }
411
412 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
413 {
414 struct vxlan_dev *vxlan = netdev_priv(dev);
415 struct vxlan_fdb f = {
416 .state = NUD_STALE,
417 };
418 struct vxlan_rdst remote = {
419 .remote_ip = *ipa, /* goes to NDA_DST */
420 .remote_vni = VXLAN_N_VID,
421 };
422
423 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
424 }
425
426 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
427 {
428 struct vxlan_fdb f = {
429 .state = NUD_STALE,
430 };
431 struct vxlan_rdst remote = { };
432
433 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
434
435 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
436 }
437
438 /* Hash Ethernet address */
439 static u32 eth_hash(const unsigned char *addr)
440 {
441 u64 value = get_unaligned((u64 *)addr);
442
443 /* only want 6 bytes */
444 #ifdef __BIG_ENDIAN
445 value >>= 16;
446 #else
447 value <<= 16;
448 #endif
449 return hash_64(value, FDB_HASH_BITS);
450 }
451
452 /* Hash chain to use given mac address */
453 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
454 const u8 *mac)
455 {
456 return &vxlan->fdb_head[eth_hash(mac)];
457 }
458
459 /* Look up Ethernet address in forwarding table */
460 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
461 const u8 *mac)
462 {
463 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
464 struct vxlan_fdb *f;
465
466 hlist_for_each_entry_rcu(f, head, hlist) {
467 if (ether_addr_equal(mac, f->eth_addr))
468 return f;
469 }
470
471 return NULL;
472 }
473
474 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
475 const u8 *mac)
476 {
477 struct vxlan_fdb *f;
478
479 f = __vxlan_find_mac(vxlan, mac);
480 if (f)
481 f->used = jiffies;
482
483 return f;
484 }
485
486 /* caller should hold vxlan->hash_lock */
487 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
488 union vxlan_addr *ip, __be16 port,
489 __u32 vni, __u32 ifindex)
490 {
491 struct vxlan_rdst *rd;
492
493 list_for_each_entry(rd, &f->remotes, list) {
494 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
495 rd->remote_port == port &&
496 rd->remote_vni == vni &&
497 rd->remote_ifindex == ifindex)
498 return rd;
499 }
500
501 return NULL;
502 }
503
504 /* Replace destination of unicast mac */
505 static int vxlan_fdb_replace(struct vxlan_fdb *f,
506 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
507 {
508 struct vxlan_rdst *rd;
509
510 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
511 if (rd)
512 return 0;
513
514 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
515 if (!rd)
516 return 0;
517 rd->remote_ip = *ip;
518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
521 return 1;
522 }
523
524 /* Add/update destinations for multicast */
525 static int vxlan_fdb_append(struct vxlan_fdb *f,
526 union vxlan_addr *ip, __be16 port, __u32 vni,
527 __u32 ifindex, struct vxlan_rdst **rdp)
528 {
529 struct vxlan_rdst *rd;
530
531 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
532 if (rd)
533 return 0;
534
535 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
536 if (rd == NULL)
537 return -ENOBUFS;
538 rd->remote_ip = *ip;
539 rd->remote_port = port;
540 rd->remote_vni = vni;
541 rd->remote_ifindex = ifindex;
542
543 list_add_tail_rcu(&rd->list, &f->remotes);
544
545 *rdp = rd;
546 return 1;
547 }
548
549 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
550 unsigned int off,
551 struct vxlanhdr *vh, size_t hdrlen,
552 u32 data, struct gro_remcsum *grc,
553 bool nopartial)
554 {
555 size_t start, offset, plen;
556
557 if (skb->remcsum_offload)
558 return NULL;
559
560 if (!NAPI_GRO_CB(skb)->csum_valid)
561 return NULL;
562
563 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
564 offset = start + ((data & VXLAN_RCO_UDP) ?
565 offsetof(struct udphdr, check) :
566 offsetof(struct tcphdr, check));
567
568 plen = hdrlen + offset + sizeof(u16);
569
570 /* Pull checksum that will be written */
571 if (skb_gro_header_hard(skb, off + plen)) {
572 vh = skb_gro_header_slow(skb, off + plen, off);
573 if (!vh)
574 return NULL;
575 }
576
577 skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
578 start, offset, grc, nopartial);
579
580 skb->remcsum_offload = 1;
581
582 return vh;
583 }
584
585 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
586 struct sk_buff *skb,
587 struct udp_offload *uoff)
588 {
589 struct sk_buff *p, **pp = NULL;
590 struct vxlanhdr *vh, *vh2;
591 unsigned int hlen, off_vx;
592 int flush = 1;
593 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
594 udp_offloads);
595 u32 flags;
596 struct gro_remcsum grc;
597
598 skb_gro_remcsum_init(&grc);
599
600 off_vx = skb_gro_offset(skb);
601 hlen = off_vx + sizeof(*vh);
602 vh = skb_gro_header_fast(skb, off_vx);
603 if (skb_gro_header_hard(skb, hlen)) {
604 vh = skb_gro_header_slow(skb, hlen, off_vx);
605 if (unlikely(!vh))
606 goto out;
607 }
608
609 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
610 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
611
612 flags = ntohl(vh->vx_flags);
613
614 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
615 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
616 ntohl(vh->vx_vni), &grc,
617 !!(vs->flags &
618 VXLAN_F_REMCSUM_NOPARTIAL));
619
620 if (!vh)
621 goto out;
622 }
623
624 flush = 0;
625
626 for (p = *head; p; p = p->next) {
627 if (!NAPI_GRO_CB(p)->same_flow)
628 continue;
629
630 vh2 = (struct vxlanhdr *)(p->data + off_vx);
631 if (vh->vx_flags != vh2->vx_flags ||
632 vh->vx_vni != vh2->vx_vni) {
633 NAPI_GRO_CB(p)->same_flow = 0;
634 continue;
635 }
636 }
637
638 pp = eth_gro_receive(head, skb);
639
640 out:
641 skb_gro_remcsum_cleanup(skb, &grc);
642 NAPI_GRO_CB(skb)->flush |= flush;
643
644 return pp;
645 }
646
647 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
648 struct udp_offload *uoff)
649 {
650 udp_tunnel_gro_complete(skb, nhoff);
651
652 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
653 }
654
655 /* Notify netdevs that UDP port started listening */
656 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
657 {
658 struct net_device *dev;
659 struct sock *sk = vs->sock->sk;
660 struct net *net = sock_net(sk);
661 sa_family_t sa_family = sk->sk_family;
662 __be16 port = inet_sk(sk)->inet_sport;
663 int err;
664
665 if (sa_family == AF_INET) {
666 err = udp_add_offload(&vs->udp_offloads);
667 if (err)
668 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
669 }
670
671 rcu_read_lock();
672 for_each_netdev_rcu(net, dev) {
673 if (dev->netdev_ops->ndo_add_vxlan_port)
674 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
675 port);
676 }
677 rcu_read_unlock();
678 }
679
680 /* Notify netdevs that UDP port is no more listening */
681 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
682 {
683 struct net_device *dev;
684 struct sock *sk = vs->sock->sk;
685 struct net *net = sock_net(sk);
686 sa_family_t sa_family = sk->sk_family;
687 __be16 port = inet_sk(sk)->inet_sport;
688
689 rcu_read_lock();
690 for_each_netdev_rcu(net, dev) {
691 if (dev->netdev_ops->ndo_del_vxlan_port)
692 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
693 port);
694 }
695 rcu_read_unlock();
696
697 if (sa_family == AF_INET)
698 udp_del_offload(&vs->udp_offloads);
699 }
700
701 /* Add new entry to forwarding table -- assumes lock held */
702 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
703 const u8 *mac, union vxlan_addr *ip,
704 __u16 state, __u16 flags,
705 __be16 port, __u32 vni, __u32 ifindex,
706 __u8 ndm_flags)
707 {
708 struct vxlan_rdst *rd = NULL;
709 struct vxlan_fdb *f;
710 int notify = 0;
711
712 f = __vxlan_find_mac(vxlan, mac);
713 if (f) {
714 if (flags & NLM_F_EXCL) {
715 netdev_dbg(vxlan->dev,
716 "lost race to create %pM\n", mac);
717 return -EEXIST;
718 }
719 if (f->state != state) {
720 f->state = state;
721 f->updated = jiffies;
722 notify = 1;
723 }
724 if (f->flags != ndm_flags) {
725 f->flags = ndm_flags;
726 f->updated = jiffies;
727 notify = 1;
728 }
729 if ((flags & NLM_F_REPLACE)) {
730 /* Only change unicasts */
731 if (!(is_multicast_ether_addr(f->eth_addr) ||
732 is_zero_ether_addr(f->eth_addr))) {
733 notify |= vxlan_fdb_replace(f, ip, port, vni,
734 ifindex);
735 } else
736 return -EOPNOTSUPP;
737 }
738 if ((flags & NLM_F_APPEND) &&
739 (is_multicast_ether_addr(f->eth_addr) ||
740 is_zero_ether_addr(f->eth_addr))) {
741 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
742 &rd);
743
744 if (rc < 0)
745 return rc;
746 notify |= rc;
747 }
748 } else {
749 if (!(flags & NLM_F_CREATE))
750 return -ENOENT;
751
752 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
753 return -ENOSPC;
754
755 /* Disallow replace to add a multicast entry */
756 if ((flags & NLM_F_REPLACE) &&
757 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
758 return -EOPNOTSUPP;
759
760 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
761 f = kmalloc(sizeof(*f), GFP_ATOMIC);
762 if (!f)
763 return -ENOMEM;
764
765 notify = 1;
766 f->state = state;
767 f->flags = ndm_flags;
768 f->updated = f->used = jiffies;
769 INIT_LIST_HEAD(&f->remotes);
770 memcpy(f->eth_addr, mac, ETH_ALEN);
771
772 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
773
774 ++vxlan->addrcnt;
775 hlist_add_head_rcu(&f->hlist,
776 vxlan_fdb_head(vxlan, mac));
777 }
778
779 if (notify) {
780 if (rd == NULL)
781 rd = first_remote_rtnl(f);
782 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
783 }
784
785 return 0;
786 }
787
788 static void vxlan_fdb_free(struct rcu_head *head)
789 {
790 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
791 struct vxlan_rdst *rd, *nd;
792
793 list_for_each_entry_safe(rd, nd, &f->remotes, list)
794 kfree(rd);
795 kfree(f);
796 }
797
798 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
799 {
800 netdev_dbg(vxlan->dev,
801 "delete %pM\n", f->eth_addr);
802
803 --vxlan->addrcnt;
804 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
805
806 hlist_del_rcu(&f->hlist);
807 call_rcu(&f->rcu, vxlan_fdb_free);
808 }
809
810 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
811 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
812 {
813 struct net *net = dev_net(vxlan->dev);
814 int err;
815
816 if (tb[NDA_DST]) {
817 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
818 if (err)
819 return err;
820 } else {
821 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
822 if (remote->sa.sa_family == AF_INET) {
823 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
824 ip->sa.sa_family = AF_INET;
825 #if IS_ENABLED(CONFIG_IPV6)
826 } else {
827 ip->sin6.sin6_addr = in6addr_any;
828 ip->sa.sa_family = AF_INET6;
829 #endif
830 }
831 }
832
833 if (tb[NDA_PORT]) {
834 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
835 return -EINVAL;
836 *port = nla_get_be16(tb[NDA_PORT]);
837 } else {
838 *port = vxlan->dst_port;
839 }
840
841 if (tb[NDA_VNI]) {
842 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
843 return -EINVAL;
844 *vni = nla_get_u32(tb[NDA_VNI]);
845 } else {
846 *vni = vxlan->default_dst.remote_vni;
847 }
848
849 if (tb[NDA_IFINDEX]) {
850 struct net_device *tdev;
851
852 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
853 return -EINVAL;
854 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
855 tdev = __dev_get_by_index(net, *ifindex);
856 if (!tdev)
857 return -EADDRNOTAVAIL;
858 } else {
859 *ifindex = 0;
860 }
861
862 return 0;
863 }
864
865 /* Add static entry (via netlink) */
866 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
867 struct net_device *dev,
868 const unsigned char *addr, u16 vid, u16 flags)
869 {
870 struct vxlan_dev *vxlan = netdev_priv(dev);
871 /* struct net *net = dev_net(vxlan->dev); */
872 union vxlan_addr ip;
873 __be16 port;
874 u32 vni, ifindex;
875 int err;
876
877 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
878 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
879 ndm->ndm_state);
880 return -EINVAL;
881 }
882
883 if (tb[NDA_DST] == NULL)
884 return -EINVAL;
885
886 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
887 if (err)
888 return err;
889
890 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
891 return -EAFNOSUPPORT;
892
893 spin_lock_bh(&vxlan->hash_lock);
894 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
895 port, vni, ifindex, ndm->ndm_flags);
896 spin_unlock_bh(&vxlan->hash_lock);
897
898 return err;
899 }
900
901 /* Delete entry (via netlink) */
902 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
903 struct net_device *dev,
904 const unsigned char *addr, u16 vid)
905 {
906 struct vxlan_dev *vxlan = netdev_priv(dev);
907 struct vxlan_fdb *f;
908 struct vxlan_rdst *rd = NULL;
909 union vxlan_addr ip;
910 __be16 port;
911 u32 vni, ifindex;
912 int err;
913
914 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
915 if (err)
916 return err;
917
918 err = -ENOENT;
919
920 spin_lock_bh(&vxlan->hash_lock);
921 f = vxlan_find_mac(vxlan, addr);
922 if (!f)
923 goto out;
924
925 if (!vxlan_addr_any(&ip)) {
926 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
927 if (!rd)
928 goto out;
929 }
930
931 err = 0;
932
933 /* remove a destination if it's not the only one on the list,
934 * otherwise destroy the fdb entry
935 */
936 if (rd && !list_is_singular(&f->remotes)) {
937 list_del_rcu(&rd->list);
938 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
939 kfree_rcu(rd, rcu);
940 goto out;
941 }
942
943 vxlan_fdb_destroy(vxlan, f);
944
945 out:
946 spin_unlock_bh(&vxlan->hash_lock);
947
948 return err;
949 }
950
951 /* Dump forwarding table */
952 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
953 struct net_device *dev,
954 struct net_device *filter_dev, int idx)
955 {
956 struct vxlan_dev *vxlan = netdev_priv(dev);
957 unsigned int h;
958
959 for (h = 0; h < FDB_HASH_SIZE; ++h) {
960 struct vxlan_fdb *f;
961 int err;
962
963 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
964 struct vxlan_rdst *rd;
965
966 if (idx < cb->args[0])
967 goto skip;
968
969 list_for_each_entry_rcu(rd, &f->remotes, list) {
970 err = vxlan_fdb_info(skb, vxlan, f,
971 NETLINK_CB(cb->skb).portid,
972 cb->nlh->nlmsg_seq,
973 RTM_NEWNEIGH,
974 NLM_F_MULTI, rd);
975 if (err < 0)
976 goto out;
977 }
978 skip:
979 ++idx;
980 }
981 }
982 out:
983 return idx;
984 }
985
986 /* Watch incoming packets to learn mapping between Ethernet address
987 * and Tunnel endpoint.
988 * Return true if packet is bogus and should be dropped.
989 */
990 static bool vxlan_snoop(struct net_device *dev,
991 union vxlan_addr *src_ip, const u8 *src_mac)
992 {
993 struct vxlan_dev *vxlan = netdev_priv(dev);
994 struct vxlan_fdb *f;
995
996 f = vxlan_find_mac(vxlan, src_mac);
997 if (likely(f)) {
998 struct vxlan_rdst *rdst = first_remote_rcu(f);
999
1000 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1001 return false;
1002
1003 /* Don't migrate static entries, drop packets */
1004 if (f->state & NUD_NOARP)
1005 return true;
1006
1007 if (net_ratelimit())
1008 netdev_info(dev,
1009 "%pM migrated from %pIS to %pIS\n",
1010 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1011
1012 rdst->remote_ip = *src_ip;
1013 f->updated = jiffies;
1014 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1015 } else {
1016 /* learned new entry */
1017 spin_lock(&vxlan->hash_lock);
1018
1019 /* close off race between vxlan_flush and incoming packets */
1020 if (netif_running(dev))
1021 vxlan_fdb_create(vxlan, src_mac, src_ip,
1022 NUD_REACHABLE,
1023 NLM_F_EXCL|NLM_F_CREATE,
1024 vxlan->dst_port,
1025 vxlan->default_dst.remote_vni,
1026 0, NTF_SELF);
1027 spin_unlock(&vxlan->hash_lock);
1028 }
1029
1030 return false;
1031 }
1032
1033 /* See if multicast group is already in use by other ID */
1034 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1035 {
1036 struct vxlan_dev *vxlan;
1037
1038 /* The vxlan_sock is only used by dev, leaving group has
1039 * no effect on other vxlan devices.
1040 */
1041 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1042 return false;
1043
1044 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1045 if (!netif_running(vxlan->dev) || vxlan == dev)
1046 continue;
1047
1048 if (vxlan->vn_sock != dev->vn_sock)
1049 continue;
1050
1051 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1052 &dev->default_dst.remote_ip))
1053 continue;
1054
1055 if (vxlan->default_dst.remote_ifindex !=
1056 dev->default_dst.remote_ifindex)
1057 continue;
1058
1059 return true;
1060 }
1061
1062 return false;
1063 }
1064
1065 void vxlan_sock_release(struct vxlan_sock *vs)
1066 {
1067 struct sock *sk = vs->sock->sk;
1068 struct net *net = sock_net(sk);
1069 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1070
1071 if (!atomic_dec_and_test(&vs->refcnt))
1072 return;
1073
1074 spin_lock(&vn->sock_lock);
1075 hlist_del_rcu(&vs->hlist);
1076 vxlan_notify_del_rx_port(vs);
1077 spin_unlock(&vn->sock_lock);
1078
1079 queue_work(vxlan_wq, &vs->del_work);
1080 }
1081 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1082
1083 /* Update multicast group membership when first VNI on
1084 * multicast address is brought up
1085 */
1086 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1087 {
1088 struct vxlan_sock *vs = vxlan->vn_sock;
1089 struct sock *sk = vs->sock->sk;
1090 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1091 int ifindex = vxlan->default_dst.remote_ifindex;
1092 int ret = -EINVAL;
1093
1094 lock_sock(sk);
1095 if (ip->sa.sa_family == AF_INET) {
1096 struct ip_mreqn mreq = {
1097 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1098 .imr_ifindex = ifindex,
1099 };
1100
1101 ret = ip_mc_join_group(sk, &mreq);
1102 #if IS_ENABLED(CONFIG_IPV6)
1103 } else {
1104 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105 &ip->sin6.sin6_addr);
1106 #endif
1107 }
1108 release_sock(sk);
1109
1110 return ret;
1111 }
1112
1113 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1114 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115 {
1116 struct vxlan_sock *vs = vxlan->vn_sock;
1117 struct sock *sk = vs->sock->sk;
1118 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1119 int ifindex = vxlan->default_dst.remote_ifindex;
1120 int ret = -EINVAL;
1121
1122 lock_sock(sk);
1123 if (ip->sa.sa_family == AF_INET) {
1124 struct ip_mreqn mreq = {
1125 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1126 .imr_ifindex = ifindex,
1127 };
1128
1129 ret = ip_mc_leave_group(sk, &mreq);
1130 #if IS_ENABLED(CONFIG_IPV6)
1131 } else {
1132 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1133 &ip->sin6.sin6_addr);
1134 #endif
1135 }
1136 release_sock(sk);
1137
1138 return ret;
1139 }
1140
1141 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1142 size_t hdrlen, u32 data, bool nopartial)
1143 {
1144 size_t start, offset, plen;
1145
1146 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1147 offset = start + ((data & VXLAN_RCO_UDP) ?
1148 offsetof(struct udphdr, check) :
1149 offsetof(struct tcphdr, check));
1150
1151 plen = hdrlen + offset + sizeof(u16);
1152
1153 if (!pskb_may_pull(skb, plen))
1154 return NULL;
1155
1156 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1157
1158 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1159 nopartial);
1160
1161 return vh;
1162 }
1163
1164 /* Callback from net/ipv4/udp.c to receive packets */
1165 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1166 {
1167 struct vxlan_sock *vs;
1168 struct vxlanhdr *vxh;
1169 u32 flags, vni;
1170 struct vxlan_metadata md = {0};
1171
1172 /* Need Vxlan and inner Ethernet header to be present */
1173 if (!pskb_may_pull(skb, VXLAN_HLEN))
1174 goto error;
1175
1176 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1177 flags = ntohl(vxh->vx_flags);
1178 vni = ntohl(vxh->vx_vni);
1179
1180 if (flags & VXLAN_HF_VNI) {
1181 flags &= ~VXLAN_HF_VNI;
1182 } else {
1183 /* VNI flag always required to be set */
1184 goto bad_flags;
1185 }
1186
1187 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1188 goto drop;
1189 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1190
1191 vs = rcu_dereference_sk_user_data(sk);
1192 if (!vs)
1193 goto drop;
1194
1195 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1196 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1197 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1198 if (!vxh)
1199 goto drop;
1200
1201 flags &= ~VXLAN_HF_RCO;
1202 vni &= VXLAN_VNI_MASK;
1203 }
1204
1205 /* For backwards compatibility, only allow reserved fields to be
1206 * used by VXLAN extensions if explicitly requested.
1207 */
1208 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1209 struct vxlanhdr_gbp *gbp;
1210
1211 gbp = (struct vxlanhdr_gbp *)vxh;
1212 md.gbp = ntohs(gbp->policy_id);
1213
1214 if (gbp->dont_learn)
1215 md.gbp |= VXLAN_GBP_DONT_LEARN;
1216
1217 if (gbp->policy_applied)
1218 md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1219
1220 flags &= ~VXLAN_GBP_USED_BITS;
1221 }
1222
1223 if (flags || vni & ~VXLAN_VNI_MASK) {
1224 /* If there are any unprocessed flags remaining treat
1225 * this as a malformed packet. This behavior diverges from
1226 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1227 * in reserved fields are to be ignored. The approach here
1228 * maintains compatibility with previous stack code, and also
1229 * is more robust and provides a little more security in
1230 * adding extensions to VXLAN.
1231 */
1232
1233 goto bad_flags;
1234 }
1235
1236 md.vni = vxh->vx_vni;
1237 vs->rcv(vs, skb, &md);
1238 return 0;
1239
1240 drop:
1241 /* Consume bad packet */
1242 kfree_skb(skb);
1243 return 0;
1244
1245 bad_flags:
1246 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1247 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1248
1249 error:
1250 /* Return non vxlan pkt */
1251 return 1;
1252 }
1253
1254 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1255 struct vxlan_metadata *md)
1256 {
1257 struct iphdr *oip = NULL;
1258 struct ipv6hdr *oip6 = NULL;
1259 struct vxlan_dev *vxlan;
1260 struct pcpu_sw_netstats *stats;
1261 union vxlan_addr saddr;
1262 __u32 vni;
1263 int err = 0;
1264 union vxlan_addr *remote_ip;
1265
1266 vni = ntohl(md->vni) >> 8;
1267 /* Is this VNI defined? */
1268 vxlan = vxlan_vs_find_vni(vs, vni);
1269 if (!vxlan)
1270 goto drop;
1271
1272 remote_ip = &vxlan->default_dst.remote_ip;
1273 skb_reset_mac_header(skb);
1274 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1275 skb->protocol = eth_type_trans(skb, vxlan->dev);
1276 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1277
1278 /* Ignore packet loops (and multicast echo) */
1279 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1280 goto drop;
1281
1282 /* Re-examine inner Ethernet packet */
1283 if (remote_ip->sa.sa_family == AF_INET) {
1284 oip = ip_hdr(skb);
1285 saddr.sin.sin_addr.s_addr = oip->saddr;
1286 saddr.sa.sa_family = AF_INET;
1287 #if IS_ENABLED(CONFIG_IPV6)
1288 } else {
1289 oip6 = ipv6_hdr(skb);
1290 saddr.sin6.sin6_addr = oip6->saddr;
1291 saddr.sa.sa_family = AF_INET6;
1292 #endif
1293 }
1294
1295 if ((vxlan->flags & VXLAN_F_LEARN) &&
1296 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1297 goto drop;
1298
1299 skb_reset_network_header(skb);
1300 skb->mark = md->gbp;
1301
1302 if (oip6)
1303 err = IP6_ECN_decapsulate(oip6, skb);
1304 if (oip)
1305 err = IP_ECN_decapsulate(oip, skb);
1306
1307 if (unlikely(err)) {
1308 if (log_ecn_error) {
1309 if (oip6)
1310 net_info_ratelimited("non-ECT from %pI6\n",
1311 &oip6->saddr);
1312 if (oip)
1313 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1314 &oip->saddr, oip->tos);
1315 }
1316 if (err > 1) {
1317 ++vxlan->dev->stats.rx_frame_errors;
1318 ++vxlan->dev->stats.rx_errors;
1319 goto drop;
1320 }
1321 }
1322
1323 stats = this_cpu_ptr(vxlan->dev->tstats);
1324 u64_stats_update_begin(&stats->syncp);
1325 stats->rx_packets++;
1326 stats->rx_bytes += skb->len;
1327 u64_stats_update_end(&stats->syncp);
1328
1329 netif_rx(skb);
1330
1331 return;
1332 drop:
1333 /* Consume bad packet */
1334 kfree_skb(skb);
1335 }
1336
1337 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1338 {
1339 struct vxlan_dev *vxlan = netdev_priv(dev);
1340 struct arphdr *parp;
1341 u8 *arpptr, *sha;
1342 __be32 sip, tip;
1343 struct neighbour *n;
1344
1345 if (dev->flags & IFF_NOARP)
1346 goto out;
1347
1348 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1349 dev->stats.tx_dropped++;
1350 goto out;
1351 }
1352 parp = arp_hdr(skb);
1353
1354 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1355 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1356 parp->ar_pro != htons(ETH_P_IP) ||
1357 parp->ar_op != htons(ARPOP_REQUEST) ||
1358 parp->ar_hln != dev->addr_len ||
1359 parp->ar_pln != 4)
1360 goto out;
1361 arpptr = (u8 *)parp + sizeof(struct arphdr);
1362 sha = arpptr;
1363 arpptr += dev->addr_len; /* sha */
1364 memcpy(&sip, arpptr, sizeof(sip));
1365 arpptr += sizeof(sip);
1366 arpptr += dev->addr_len; /* tha */
1367 memcpy(&tip, arpptr, sizeof(tip));
1368
1369 if (ipv4_is_loopback(tip) ||
1370 ipv4_is_multicast(tip))
1371 goto out;
1372
1373 n = neigh_lookup(&arp_tbl, &tip, dev);
1374
1375 if (n) {
1376 struct vxlan_fdb *f;
1377 struct sk_buff *reply;
1378
1379 if (!(n->nud_state & NUD_CONNECTED)) {
1380 neigh_release(n);
1381 goto out;
1382 }
1383
1384 f = vxlan_find_mac(vxlan, n->ha);
1385 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1386 /* bridge-local neighbor */
1387 neigh_release(n);
1388 goto out;
1389 }
1390
1391 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1392 n->ha, sha);
1393
1394 neigh_release(n);
1395
1396 if (reply == NULL)
1397 goto out;
1398
1399 skb_reset_mac_header(reply);
1400 __skb_pull(reply, skb_network_offset(reply));
1401 reply->ip_summed = CHECKSUM_UNNECESSARY;
1402 reply->pkt_type = PACKET_HOST;
1403
1404 if (netif_rx_ni(reply) == NET_RX_DROP)
1405 dev->stats.rx_dropped++;
1406 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1407 union vxlan_addr ipa = {
1408 .sin.sin_addr.s_addr = tip,
1409 .sin.sin_family = AF_INET,
1410 };
1411
1412 vxlan_ip_miss(dev, &ipa);
1413 }
1414 out:
1415 consume_skb(skb);
1416 return NETDEV_TX_OK;
1417 }
1418
1419 #if IS_ENABLED(CONFIG_IPV6)
1420 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1421 struct neighbour *n, bool isrouter)
1422 {
1423 struct net_device *dev = request->dev;
1424 struct sk_buff *reply;
1425 struct nd_msg *ns, *na;
1426 struct ipv6hdr *pip6;
1427 u8 *daddr;
1428 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1429 int ns_olen;
1430 int i, len;
1431
1432 if (dev == NULL)
1433 return NULL;
1434
1435 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1436 sizeof(*na) + na_olen + dev->needed_tailroom;
1437 reply = alloc_skb(len, GFP_ATOMIC);
1438 if (reply == NULL)
1439 return NULL;
1440
1441 reply->protocol = htons(ETH_P_IPV6);
1442 reply->dev = dev;
1443 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1444 skb_push(reply, sizeof(struct ethhdr));
1445 skb_set_mac_header(reply, 0);
1446
1447 ns = (struct nd_msg *)skb_transport_header(request);
1448
1449 daddr = eth_hdr(request)->h_source;
1450 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1451 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1452 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1453 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1454 break;
1455 }
1456 }
1457
1458 /* Ethernet header */
1459 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1460 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1461 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1462 reply->protocol = htons(ETH_P_IPV6);
1463
1464 skb_pull(reply, sizeof(struct ethhdr));
1465 skb_set_network_header(reply, 0);
1466 skb_put(reply, sizeof(struct ipv6hdr));
1467
1468 /* IPv6 header */
1469
1470 pip6 = ipv6_hdr(reply);
1471 memset(pip6, 0, sizeof(struct ipv6hdr));
1472 pip6->version = 6;
1473 pip6->priority = ipv6_hdr(request)->priority;
1474 pip6->nexthdr = IPPROTO_ICMPV6;
1475 pip6->hop_limit = 255;
1476 pip6->daddr = ipv6_hdr(request)->saddr;
1477 pip6->saddr = *(struct in6_addr *)n->primary_key;
1478
1479 skb_pull(reply, sizeof(struct ipv6hdr));
1480 skb_set_transport_header(reply, 0);
1481
1482 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1483
1484 /* Neighbor Advertisement */
1485 memset(na, 0, sizeof(*na)+na_olen);
1486 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1487 na->icmph.icmp6_router = isrouter;
1488 na->icmph.icmp6_override = 1;
1489 na->icmph.icmp6_solicited = 1;
1490 na->target = ns->target;
1491 ether_addr_copy(&na->opt[2], n->ha);
1492 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1493 na->opt[1] = na_olen >> 3;
1494
1495 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1496 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1497 csum_partial(na, sizeof(*na)+na_olen, 0));
1498
1499 pip6->payload_len = htons(sizeof(*na)+na_olen);
1500
1501 skb_push(reply, sizeof(struct ipv6hdr));
1502
1503 reply->ip_summed = CHECKSUM_UNNECESSARY;
1504
1505 return reply;
1506 }
1507
1508 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1509 {
1510 struct vxlan_dev *vxlan = netdev_priv(dev);
1511 struct nd_msg *msg;
1512 const struct ipv6hdr *iphdr;
1513 const struct in6_addr *saddr, *daddr;
1514 struct neighbour *n;
1515 struct inet6_dev *in6_dev;
1516
1517 in6_dev = __in6_dev_get(dev);
1518 if (!in6_dev)
1519 goto out;
1520
1521 iphdr = ipv6_hdr(skb);
1522 saddr = &iphdr->saddr;
1523 daddr = &iphdr->daddr;
1524
1525 msg = (struct nd_msg *)skb_transport_header(skb);
1526 if (msg->icmph.icmp6_code != 0 ||
1527 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1528 goto out;
1529
1530 if (ipv6_addr_loopback(daddr) ||
1531 ipv6_addr_is_multicast(&msg->target))
1532 goto out;
1533
1534 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1535
1536 if (n) {
1537 struct vxlan_fdb *f;
1538 struct sk_buff *reply;
1539
1540 if (!(n->nud_state & NUD_CONNECTED)) {
1541 neigh_release(n);
1542 goto out;
1543 }
1544
1545 f = vxlan_find_mac(vxlan, n->ha);
1546 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1547 /* bridge-local neighbor */
1548 neigh_release(n);
1549 goto out;
1550 }
1551
1552 reply = vxlan_na_create(skb, n,
1553 !!(f ? f->flags & NTF_ROUTER : 0));
1554
1555 neigh_release(n);
1556
1557 if (reply == NULL)
1558 goto out;
1559
1560 if (netif_rx_ni(reply) == NET_RX_DROP)
1561 dev->stats.rx_dropped++;
1562
1563 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1564 union vxlan_addr ipa = {
1565 .sin6.sin6_addr = msg->target,
1566 .sin6.sin6_family = AF_INET6,
1567 };
1568
1569 vxlan_ip_miss(dev, &ipa);
1570 }
1571
1572 out:
1573 consume_skb(skb);
1574 return NETDEV_TX_OK;
1575 }
1576 #endif
1577
1578 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1579 {
1580 struct vxlan_dev *vxlan = netdev_priv(dev);
1581 struct neighbour *n;
1582
1583 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1584 return false;
1585
1586 n = NULL;
1587 switch (ntohs(eth_hdr(skb)->h_proto)) {
1588 case ETH_P_IP:
1589 {
1590 struct iphdr *pip;
1591
1592 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1593 return false;
1594 pip = ip_hdr(skb);
1595 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1596 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1597 union vxlan_addr ipa = {
1598 .sin.sin_addr.s_addr = pip->daddr,
1599 .sin.sin_family = AF_INET,
1600 };
1601
1602 vxlan_ip_miss(dev, &ipa);
1603 return false;
1604 }
1605
1606 break;
1607 }
1608 #if IS_ENABLED(CONFIG_IPV6)
1609 case ETH_P_IPV6:
1610 {
1611 struct ipv6hdr *pip6;
1612
1613 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1614 return false;
1615 pip6 = ipv6_hdr(skb);
1616 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1617 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618 union vxlan_addr ipa = {
1619 .sin6.sin6_addr = pip6->daddr,
1620 .sin6.sin6_family = AF_INET6,
1621 };
1622
1623 vxlan_ip_miss(dev, &ipa);
1624 return false;
1625 }
1626
1627 break;
1628 }
1629 #endif
1630 default:
1631 return false;
1632 }
1633
1634 if (n) {
1635 bool diff;
1636
1637 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1638 if (diff) {
1639 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1640 dev->addr_len);
1641 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1642 }
1643 neigh_release(n);
1644 return diff;
1645 }
1646
1647 return false;
1648 }
1649
1650 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1651 struct vxlan_metadata *md)
1652 {
1653 struct vxlanhdr_gbp *gbp;
1654
1655 if (!md->gbp)
1656 return;
1657
1658 gbp = (struct vxlanhdr_gbp *)vxh;
1659 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1660
1661 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1662 gbp->dont_learn = 1;
1663
1664 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1665 gbp->policy_applied = 1;
1666
1667 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1668 }
1669
1670 #if IS_ENABLED(CONFIG_IPV6)
1671 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1672 struct sk_buff *skb,
1673 struct net_device *dev, struct in6_addr *saddr,
1674 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1675 __be16 src_port, __be16 dst_port,
1676 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1677 {
1678 struct vxlanhdr *vxh;
1679 int min_headroom;
1680 int err;
1681 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1682 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1683 u16 hdrlen = sizeof(struct vxlanhdr);
1684
1685 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1686 skb->ip_summed == CHECKSUM_PARTIAL) {
1687 int csum_start = skb_checksum_start_offset(skb);
1688
1689 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1690 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1691 (skb->csum_offset == offsetof(struct udphdr, check) ||
1692 skb->csum_offset == offsetof(struct tcphdr, check))) {
1693 udp_sum = false;
1694 type |= SKB_GSO_TUNNEL_REMCSUM;
1695 }
1696 }
1697
1698 skb_scrub_packet(skb, xnet);
1699
1700 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1701 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1702 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1703
1704 /* Need space for new headers (invalidates iph ptr) */
1705 err = skb_cow_head(skb, min_headroom);
1706 if (unlikely(err)) {
1707 kfree_skb(skb);
1708 goto err;
1709 }
1710
1711 skb = vlan_hwaccel_push_inside(skb);
1712 if (WARN_ON(!skb)) {
1713 err = -ENOMEM;
1714 goto err;
1715 }
1716
1717 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1718 if (IS_ERR(skb)) {
1719 err = -EINVAL;
1720 goto err;
1721 }
1722
1723 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1724 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1725 vxh->vx_vni = md->vni;
1726
1727 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1728 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1729 VXLAN_RCO_SHIFT;
1730
1731 if (skb->csum_offset == offsetof(struct udphdr, check))
1732 data |= VXLAN_RCO_UDP;
1733
1734 vxh->vx_vni |= htonl(data);
1735 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1736
1737 if (!skb_is_gso(skb)) {
1738 skb->ip_summed = CHECKSUM_NONE;
1739 skb->encapsulation = 0;
1740 }
1741 }
1742
1743 if (vxflags & VXLAN_F_GBP)
1744 vxlan_build_gbp_hdr(vxh, vxflags, md);
1745
1746 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1747
1748 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1749 ttl, src_port, dst_port,
1750 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1751 return 0;
1752 err:
1753 dst_release(dst);
1754 return err;
1755 }
1756 #endif
1757
1758 int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1759 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1760 __be16 src_port, __be16 dst_port,
1761 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1762 {
1763 struct vxlanhdr *vxh;
1764 int min_headroom;
1765 int err;
1766 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1767 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1768 u16 hdrlen = sizeof(struct vxlanhdr);
1769
1770 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1771 skb->ip_summed == CHECKSUM_PARTIAL) {
1772 int csum_start = skb_checksum_start_offset(skb);
1773
1774 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1775 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1776 (skb->csum_offset == offsetof(struct udphdr, check) ||
1777 skb->csum_offset == offsetof(struct tcphdr, check))) {
1778 udp_sum = false;
1779 type |= SKB_GSO_TUNNEL_REMCSUM;
1780 }
1781 }
1782
1783 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1784 + VXLAN_HLEN + sizeof(struct iphdr)
1785 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1786
1787 /* Need space for new headers (invalidates iph ptr) */
1788 err = skb_cow_head(skb, min_headroom);
1789 if (unlikely(err)) {
1790 kfree_skb(skb);
1791 return err;
1792 }
1793
1794 skb = vlan_hwaccel_push_inside(skb);
1795 if (WARN_ON(!skb))
1796 return -ENOMEM;
1797
1798 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1799 if (IS_ERR(skb))
1800 return PTR_ERR(skb);
1801
1802 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1803 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1804 vxh->vx_vni = md->vni;
1805
1806 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1807 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1808 VXLAN_RCO_SHIFT;
1809
1810 if (skb->csum_offset == offsetof(struct udphdr, check))
1811 data |= VXLAN_RCO_UDP;
1812
1813 vxh->vx_vni |= htonl(data);
1814 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1815
1816 if (!skb_is_gso(skb)) {
1817 skb->ip_summed = CHECKSUM_NONE;
1818 skb->encapsulation = 0;
1819 }
1820 }
1821
1822 if (vxflags & VXLAN_F_GBP)
1823 vxlan_build_gbp_hdr(vxh, vxflags, md);
1824
1825 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1826
1827 return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1828 ttl, df, src_port, dst_port, xnet,
1829 !(vxflags & VXLAN_F_UDP_CSUM));
1830 }
1831 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1832
1833 /* Bypass encapsulation if the destination is local */
1834 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1835 struct vxlan_dev *dst_vxlan)
1836 {
1837 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1838 union vxlan_addr loopback;
1839 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1840 struct net_device *dev = skb->dev;
1841 int len = skb->len;
1842
1843 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1844 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1845 skb->pkt_type = PACKET_HOST;
1846 skb->encapsulation = 0;
1847 skb->dev = dst_vxlan->dev;
1848 __skb_pull(skb, skb_network_offset(skb));
1849
1850 if (remote_ip->sa.sa_family == AF_INET) {
1851 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1852 loopback.sa.sa_family = AF_INET;
1853 #if IS_ENABLED(CONFIG_IPV6)
1854 } else {
1855 loopback.sin6.sin6_addr = in6addr_loopback;
1856 loopback.sa.sa_family = AF_INET6;
1857 #endif
1858 }
1859
1860 if (dst_vxlan->flags & VXLAN_F_LEARN)
1861 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1862
1863 u64_stats_update_begin(&tx_stats->syncp);
1864 tx_stats->tx_packets++;
1865 tx_stats->tx_bytes += len;
1866 u64_stats_update_end(&tx_stats->syncp);
1867
1868 if (netif_rx(skb) == NET_RX_SUCCESS) {
1869 u64_stats_update_begin(&rx_stats->syncp);
1870 rx_stats->rx_packets++;
1871 rx_stats->rx_bytes += len;
1872 u64_stats_update_end(&rx_stats->syncp);
1873 } else {
1874 dev->stats.rx_dropped++;
1875 }
1876 }
1877
1878 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1879 struct vxlan_rdst *rdst, bool did_rsc)
1880 {
1881 struct vxlan_dev *vxlan = netdev_priv(dev);
1882 struct sock *sk = vxlan->vn_sock->sock->sk;
1883 struct rtable *rt = NULL;
1884 const struct iphdr *old_iph;
1885 struct flowi4 fl4;
1886 union vxlan_addr *dst;
1887 struct vxlan_metadata md;
1888 __be16 src_port = 0, dst_port;
1889 u32 vni;
1890 __be16 df = 0;
1891 __u8 tos, ttl;
1892 int err;
1893
1894 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1895 vni = rdst->remote_vni;
1896 dst = &rdst->remote_ip;
1897
1898 if (vxlan_addr_any(dst)) {
1899 if (did_rsc) {
1900 /* short-circuited back to local bridge */
1901 vxlan_encap_bypass(skb, vxlan, vxlan);
1902 return;
1903 }
1904 goto drop;
1905 }
1906
1907 old_iph = ip_hdr(skb);
1908
1909 ttl = vxlan->ttl;
1910 if (!ttl && vxlan_addr_multicast(dst))
1911 ttl = 1;
1912
1913 tos = vxlan->tos;
1914 if (tos == 1)
1915 tos = ip_tunnel_get_dsfield(old_iph, skb);
1916
1917 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1918 vxlan->port_max, true);
1919
1920 if (dst->sa.sa_family == AF_INET) {
1921 memset(&fl4, 0, sizeof(fl4));
1922 fl4.flowi4_oif = rdst->remote_ifindex;
1923 fl4.flowi4_tos = RT_TOS(tos);
1924 fl4.daddr = dst->sin.sin_addr.s_addr;
1925 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1926
1927 rt = ip_route_output_key(vxlan->net, &fl4);
1928 if (IS_ERR(rt)) {
1929 netdev_dbg(dev, "no route to %pI4\n",
1930 &dst->sin.sin_addr.s_addr);
1931 dev->stats.tx_carrier_errors++;
1932 goto tx_error;
1933 }
1934
1935 if (rt->dst.dev == dev) {
1936 netdev_dbg(dev, "circular route to %pI4\n",
1937 &dst->sin.sin_addr.s_addr);
1938 dev->stats.collisions++;
1939 goto rt_tx_error;
1940 }
1941
1942 /* Bypass encapsulation if the destination is local */
1943 if (rt->rt_flags & RTCF_LOCAL &&
1944 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1945 struct vxlan_dev *dst_vxlan;
1946
1947 ip_rt_put(rt);
1948 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1949 dst->sa.sa_family, dst_port,
1950 vxlan->flags);
1951 if (!dst_vxlan)
1952 goto tx_error;
1953 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1954 return;
1955 }
1956
1957 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1958 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1959 md.vni = htonl(vni << 8);
1960 md.gbp = skb->mark;
1961
1962 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
1963 dst->sin.sin_addr.s_addr, tos, ttl, df,
1964 src_port, dst_port, &md,
1965 !net_eq(vxlan->net, dev_net(vxlan->dev)),
1966 vxlan->flags);
1967 if (err < 0) {
1968 /* skb is already freed. */
1969 skb = NULL;
1970 goto rt_tx_error;
1971 }
1972
1973 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1974 #if IS_ENABLED(CONFIG_IPV6)
1975 } else {
1976 struct dst_entry *ndst;
1977 struct flowi6 fl6;
1978 u32 flags;
1979
1980 memset(&fl6, 0, sizeof(fl6));
1981 fl6.flowi6_oif = rdst->remote_ifindex;
1982 fl6.daddr = dst->sin6.sin6_addr;
1983 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1984 fl6.flowi6_proto = IPPROTO_UDP;
1985
1986 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1987 netdev_dbg(dev, "no route to %pI6\n",
1988 &dst->sin6.sin6_addr);
1989 dev->stats.tx_carrier_errors++;
1990 goto tx_error;
1991 }
1992
1993 if (ndst->dev == dev) {
1994 netdev_dbg(dev, "circular route to %pI6\n",
1995 &dst->sin6.sin6_addr);
1996 dst_release(ndst);
1997 dev->stats.collisions++;
1998 goto tx_error;
1999 }
2000
2001 /* Bypass encapsulation if the destination is local */
2002 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2003 if (flags & RTF_LOCAL &&
2004 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2005 struct vxlan_dev *dst_vxlan;
2006
2007 dst_release(ndst);
2008 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2009 dst->sa.sa_family, dst_port,
2010 vxlan->flags);
2011 if (!dst_vxlan)
2012 goto tx_error;
2013 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2014 return;
2015 }
2016
2017 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2018 md.vni = htonl(vni << 8);
2019 md.gbp = skb->mark;
2020
2021 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
2022 0, ttl, src_port, dst_port, &md,
2023 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2024 vxlan->flags);
2025 #endif
2026 }
2027
2028 return;
2029
2030 drop:
2031 dev->stats.tx_dropped++;
2032 goto tx_free;
2033
2034 rt_tx_error:
2035 ip_rt_put(rt);
2036 tx_error:
2037 dev->stats.tx_errors++;
2038 tx_free:
2039 dev_kfree_skb(skb);
2040 }
2041
2042 /* Transmit local packets over Vxlan
2043 *
2044 * Outer IP header inherits ECN and DF from inner header.
2045 * Outer UDP destination is the VXLAN assigned port.
2046 * source port is based on hash of flow
2047 */
2048 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2049 {
2050 struct vxlan_dev *vxlan = netdev_priv(dev);
2051 struct ethhdr *eth;
2052 bool did_rsc = false;
2053 struct vxlan_rdst *rdst, *fdst = NULL;
2054 struct vxlan_fdb *f;
2055
2056 skb_reset_mac_header(skb);
2057 eth = eth_hdr(skb);
2058
2059 if ((vxlan->flags & VXLAN_F_PROXY)) {
2060 if (ntohs(eth->h_proto) == ETH_P_ARP)
2061 return arp_reduce(dev, skb);
2062 #if IS_ENABLED(CONFIG_IPV6)
2063 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2064 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2065 + sizeof(struct nd_msg)) &&
2066 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2067 struct nd_msg *msg;
2068
2069 msg = (struct nd_msg *)skb_transport_header(skb);
2070 if (msg->icmph.icmp6_code == 0 &&
2071 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2072 return neigh_reduce(dev, skb);
2073 }
2074 eth = eth_hdr(skb);
2075 #endif
2076 }
2077
2078 f = vxlan_find_mac(vxlan, eth->h_dest);
2079 did_rsc = false;
2080
2081 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2082 (ntohs(eth->h_proto) == ETH_P_IP ||
2083 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2084 did_rsc = route_shortcircuit(dev, skb);
2085 if (did_rsc)
2086 f = vxlan_find_mac(vxlan, eth->h_dest);
2087 }
2088
2089 if (f == NULL) {
2090 f = vxlan_find_mac(vxlan, all_zeros_mac);
2091 if (f == NULL) {
2092 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2093 !is_multicast_ether_addr(eth->h_dest))
2094 vxlan_fdb_miss(vxlan, eth->h_dest);
2095
2096 dev->stats.tx_dropped++;
2097 kfree_skb(skb);
2098 return NETDEV_TX_OK;
2099 }
2100 }
2101
2102 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2103 struct sk_buff *skb1;
2104
2105 if (!fdst) {
2106 fdst = rdst;
2107 continue;
2108 }
2109 skb1 = skb_clone(skb, GFP_ATOMIC);
2110 if (skb1)
2111 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2112 }
2113
2114 if (fdst)
2115 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2116 else
2117 kfree_skb(skb);
2118 return NETDEV_TX_OK;
2119 }
2120
2121 /* Walk the forwarding table and purge stale entries */
2122 static void vxlan_cleanup(unsigned long arg)
2123 {
2124 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2125 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2126 unsigned int h;
2127
2128 if (!netif_running(vxlan->dev))
2129 return;
2130
2131 spin_lock_bh(&vxlan->hash_lock);
2132 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2133 struct hlist_node *p, *n;
2134 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2135 struct vxlan_fdb *f
2136 = container_of(p, struct vxlan_fdb, hlist);
2137 unsigned long timeout;
2138
2139 if (f->state & NUD_PERMANENT)
2140 continue;
2141
2142 timeout = f->used + vxlan->age_interval * HZ;
2143 if (time_before_eq(timeout, jiffies)) {
2144 netdev_dbg(vxlan->dev,
2145 "garbage collect %pM\n",
2146 f->eth_addr);
2147 f->state = NUD_STALE;
2148 vxlan_fdb_destroy(vxlan, f);
2149 } else if (time_before(timeout, next_timer))
2150 next_timer = timeout;
2151 }
2152 }
2153 spin_unlock_bh(&vxlan->hash_lock);
2154
2155 mod_timer(&vxlan->age_timer, next_timer);
2156 }
2157
2158 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2159 {
2160 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2161 __u32 vni = vxlan->default_dst.remote_vni;
2162
2163 vxlan->vn_sock = vs;
2164 spin_lock(&vn->sock_lock);
2165 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2166 spin_unlock(&vn->sock_lock);
2167 }
2168
2169 /* Setup stats when device is created */
2170 static int vxlan_init(struct net_device *dev)
2171 {
2172 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2173 if (!dev->tstats)
2174 return -ENOMEM;
2175
2176 return 0;
2177 }
2178
2179 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2180 {
2181 struct vxlan_fdb *f;
2182
2183 spin_lock_bh(&vxlan->hash_lock);
2184 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2185 if (f)
2186 vxlan_fdb_destroy(vxlan, f);
2187 spin_unlock_bh(&vxlan->hash_lock);
2188 }
2189
2190 static void vxlan_uninit(struct net_device *dev)
2191 {
2192 struct vxlan_dev *vxlan = netdev_priv(dev);
2193
2194 vxlan_fdb_delete_default(vxlan);
2195
2196 free_percpu(dev->tstats);
2197 }
2198
2199 /* Start ageing timer and join group when device is brought up */
2200 static int vxlan_open(struct net_device *dev)
2201 {
2202 struct vxlan_dev *vxlan = netdev_priv(dev);
2203 struct vxlan_sock *vs;
2204 int ret = 0;
2205
2206 vs = vxlan_sock_add(vxlan->net, vxlan->dst_port, vxlan_rcv, NULL,
2207 false, vxlan->flags);
2208 if (IS_ERR(vs))
2209 return PTR_ERR(vs);
2210
2211 vxlan_vs_add_dev(vs, vxlan);
2212
2213 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2214 ret = vxlan_igmp_join(vxlan);
2215 if (ret) {
2216 vxlan_sock_release(vs);
2217 return ret;
2218 }
2219 }
2220
2221 if (vxlan->age_interval)
2222 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2223
2224 return ret;
2225 }
2226
2227 /* Purge the forwarding table */
2228 static void vxlan_flush(struct vxlan_dev *vxlan)
2229 {
2230 unsigned int h;
2231
2232 spin_lock_bh(&vxlan->hash_lock);
2233 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2234 struct hlist_node *p, *n;
2235 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2236 struct vxlan_fdb *f
2237 = container_of(p, struct vxlan_fdb, hlist);
2238 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2239 if (!is_zero_ether_addr(f->eth_addr))
2240 vxlan_fdb_destroy(vxlan, f);
2241 }
2242 }
2243 spin_unlock_bh(&vxlan->hash_lock);
2244 }
2245
2246 /* Cleanup timer and forwarding table on shutdown */
2247 static int vxlan_stop(struct net_device *dev)
2248 {
2249 struct vxlan_dev *vxlan = netdev_priv(dev);
2250 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2251 struct vxlan_sock *vs = vxlan->vn_sock;
2252 int ret = 0;
2253
2254 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2255 !vxlan_group_used(vn, vxlan))
2256 ret = vxlan_igmp_leave(vxlan);
2257
2258 del_timer_sync(&vxlan->age_timer);
2259
2260 vxlan_flush(vxlan);
2261 vxlan_sock_release(vs);
2262
2263 return ret;
2264 }
2265
2266 /* Stub, nothing needs to be done. */
2267 static void vxlan_set_multicast_list(struct net_device *dev)
2268 {
2269 }
2270
2271 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2272 {
2273 struct vxlan_dev *vxlan = netdev_priv(dev);
2274 struct vxlan_rdst *dst = &vxlan->default_dst;
2275 struct net_device *lowerdev;
2276 int max_mtu;
2277
2278 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2279 if (lowerdev == NULL)
2280 return eth_change_mtu(dev, new_mtu);
2281
2282 if (dst->remote_ip.sa.sa_family == AF_INET6)
2283 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2284 else
2285 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2286
2287 if (new_mtu < 68 || new_mtu > max_mtu)
2288 return -EINVAL;
2289
2290 dev->mtu = new_mtu;
2291 return 0;
2292 }
2293
2294 static const struct net_device_ops vxlan_netdev_ops = {
2295 .ndo_init = vxlan_init,
2296 .ndo_uninit = vxlan_uninit,
2297 .ndo_open = vxlan_open,
2298 .ndo_stop = vxlan_stop,
2299 .ndo_start_xmit = vxlan_xmit,
2300 .ndo_get_stats64 = ip_tunnel_get_stats64,
2301 .ndo_set_rx_mode = vxlan_set_multicast_list,
2302 .ndo_change_mtu = vxlan_change_mtu,
2303 .ndo_validate_addr = eth_validate_addr,
2304 .ndo_set_mac_address = eth_mac_addr,
2305 .ndo_fdb_add = vxlan_fdb_add,
2306 .ndo_fdb_del = vxlan_fdb_delete,
2307 .ndo_fdb_dump = vxlan_fdb_dump,
2308 };
2309
2310 /* Info for udev, that this is a virtual tunnel endpoint */
2311 static struct device_type vxlan_type = {
2312 .name = "vxlan",
2313 };
2314
2315 /* Calls the ndo_add_vxlan_port of the caller in order to
2316 * supply the listening VXLAN udp ports. Callers are expected
2317 * to implement the ndo_add_vxlan_port.
2318 */
2319 void vxlan_get_rx_port(struct net_device *dev)
2320 {
2321 struct vxlan_sock *vs;
2322 struct net *net = dev_net(dev);
2323 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2324 sa_family_t sa_family;
2325 __be16 port;
2326 unsigned int i;
2327
2328 spin_lock(&vn->sock_lock);
2329 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2330 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2331 port = inet_sk(vs->sock->sk)->inet_sport;
2332 sa_family = vs->sock->sk->sk_family;
2333 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2334 port);
2335 }
2336 }
2337 spin_unlock(&vn->sock_lock);
2338 }
2339 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2340
2341 /* Initialize the device structure. */
2342 static void vxlan_setup(struct net_device *dev)
2343 {
2344 struct vxlan_dev *vxlan = netdev_priv(dev);
2345 unsigned int h;
2346
2347 eth_hw_addr_random(dev);
2348 ether_setup(dev);
2349 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2350 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2351 else
2352 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2353
2354 dev->netdev_ops = &vxlan_netdev_ops;
2355 dev->destructor = free_netdev;
2356 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2357
2358 dev->tx_queue_len = 0;
2359 dev->features |= NETIF_F_LLTX;
2360 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2361 dev->features |= NETIF_F_RXCSUM;
2362 dev->features |= NETIF_F_GSO_SOFTWARE;
2363
2364 dev->vlan_features = dev->features;
2365 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2366 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2367 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2368 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2369 netif_keep_dst(dev);
2370 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2371
2372 INIT_LIST_HEAD(&vxlan->next);
2373 spin_lock_init(&vxlan->hash_lock);
2374
2375 init_timer_deferrable(&vxlan->age_timer);
2376 vxlan->age_timer.function = vxlan_cleanup;
2377 vxlan->age_timer.data = (unsigned long) vxlan;
2378
2379 vxlan->dst_port = htons(vxlan_port);
2380
2381 vxlan->dev = dev;
2382
2383 for (h = 0; h < FDB_HASH_SIZE; ++h)
2384 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2385 }
2386
2387 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2388 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2389 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2390 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2391 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2392 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2393 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2394 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2395 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2396 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2397 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2398 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2399 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2400 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2401 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2402 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2403 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2404 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2405 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2406 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2407 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2408 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2409 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2410 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2411 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2412 };
2413
2414 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2415 {
2416 if (tb[IFLA_ADDRESS]) {
2417 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2418 pr_debug("invalid link address (not ethernet)\n");
2419 return -EINVAL;
2420 }
2421
2422 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2423 pr_debug("invalid all zero ethernet address\n");
2424 return -EADDRNOTAVAIL;
2425 }
2426 }
2427
2428 if (!data)
2429 return -EINVAL;
2430
2431 if (data[IFLA_VXLAN_ID]) {
2432 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2433 if (id >= VXLAN_VID_MASK)
2434 return -ERANGE;
2435 }
2436
2437 if (data[IFLA_VXLAN_PORT_RANGE]) {
2438 const struct ifla_vxlan_port_range *p
2439 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2440
2441 if (ntohs(p->high) < ntohs(p->low)) {
2442 pr_debug("port range %u .. %u not valid\n",
2443 ntohs(p->low), ntohs(p->high));
2444 return -EINVAL;
2445 }
2446 }
2447
2448 return 0;
2449 }
2450
2451 static void vxlan_get_drvinfo(struct net_device *netdev,
2452 struct ethtool_drvinfo *drvinfo)
2453 {
2454 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2455 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2456 }
2457
2458 static const struct ethtool_ops vxlan_ethtool_ops = {
2459 .get_drvinfo = vxlan_get_drvinfo,
2460 .get_link = ethtool_op_get_link,
2461 };
2462
2463 static void vxlan_del_work(struct work_struct *work)
2464 {
2465 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2466 udp_tunnel_sock_release(vs->sock);
2467 kfree_rcu(vs, rcu);
2468 }
2469
2470 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2471 __be16 port, u32 flags)
2472 {
2473 struct socket *sock;
2474 struct udp_port_cfg udp_conf;
2475 int err;
2476
2477 memset(&udp_conf, 0, sizeof(udp_conf));
2478
2479 if (ipv6) {
2480 udp_conf.family = AF_INET6;
2481 udp_conf.use_udp6_rx_checksums =
2482 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2483 } else {
2484 udp_conf.family = AF_INET;
2485 }
2486
2487 udp_conf.local_udp_port = port;
2488
2489 /* Open UDP socket */
2490 err = udp_sock_create(net, &udp_conf, &sock);
2491 if (err < 0)
2492 return ERR_PTR(err);
2493
2494 return sock;
2495 }
2496
2497 /* Create new listen socket if needed */
2498 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2499 vxlan_rcv_t *rcv, void *data,
2500 u32 flags)
2501 {
2502 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2503 struct vxlan_sock *vs;
2504 struct socket *sock;
2505 unsigned int h;
2506 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2507 struct udp_tunnel_sock_cfg tunnel_cfg;
2508
2509 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2510 if (!vs)
2511 return ERR_PTR(-ENOMEM);
2512
2513 for (h = 0; h < VNI_HASH_SIZE; ++h)
2514 INIT_HLIST_HEAD(&vs->vni_list[h]);
2515
2516 INIT_WORK(&vs->del_work, vxlan_del_work);
2517
2518 sock = vxlan_create_sock(net, ipv6, port, flags);
2519 if (IS_ERR(sock)) {
2520 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2521 PTR_ERR(sock));
2522 kfree(vs);
2523 return ERR_CAST(sock);
2524 }
2525
2526 vs->sock = sock;
2527 atomic_set(&vs->refcnt, 1);
2528 vs->rcv = rcv;
2529 vs->data = data;
2530 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2531
2532 /* Initialize the vxlan udp offloads structure */
2533 vs->udp_offloads.port = port;
2534 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2535 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2536
2537 spin_lock(&vn->sock_lock);
2538 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2539 vxlan_notify_add_rx_port(vs);
2540 spin_unlock(&vn->sock_lock);
2541
2542 /* Mark socket as an encapsulation socket. */
2543 tunnel_cfg.sk_user_data = vs;
2544 tunnel_cfg.encap_type = 1;
2545 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2546 tunnel_cfg.encap_destroy = NULL;
2547
2548 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2549
2550 return vs;
2551 }
2552
2553 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2554 vxlan_rcv_t *rcv, void *data,
2555 bool no_share, u32 flags)
2556 {
2557 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2558 struct vxlan_sock *vs;
2559 bool ipv6 = flags & VXLAN_F_IPV6;
2560
2561 if (!no_share) {
2562 spin_lock(&vn->sock_lock);
2563 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
2564 flags);
2565 if (vs && vs->rcv == rcv) {
2566 if (!atomic_add_unless(&vs->refcnt, 1, 0))
2567 vs = ERR_PTR(-EBUSY);
2568 spin_unlock(&vn->sock_lock);
2569 return vs;
2570 }
2571 spin_unlock(&vn->sock_lock);
2572 }
2573
2574 return vxlan_socket_create(net, port, rcv, data, flags);
2575 }
2576 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2577
2578 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2579 struct nlattr *tb[], struct nlattr *data[])
2580 {
2581 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2582 struct vxlan_dev *vxlan = netdev_priv(dev);
2583 struct vxlan_rdst *dst = &vxlan->default_dst;
2584 __u32 vni;
2585 int err;
2586 bool use_ipv6 = false;
2587
2588 if (!data[IFLA_VXLAN_ID])
2589 return -EINVAL;
2590
2591 vxlan->net = src_net;
2592
2593 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2594 dst->remote_vni = vni;
2595
2596 /* Unless IPv6 is explicitly requested, assume IPv4 */
2597 dst->remote_ip.sa.sa_family = AF_INET;
2598 if (data[IFLA_VXLAN_GROUP]) {
2599 dst->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2600 } else if (data[IFLA_VXLAN_GROUP6]) {
2601 if (!IS_ENABLED(CONFIG_IPV6))
2602 return -EPFNOSUPPORT;
2603
2604 dst->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2605 dst->remote_ip.sa.sa_family = AF_INET6;
2606 use_ipv6 = true;
2607 }
2608
2609 if (data[IFLA_VXLAN_LOCAL]) {
2610 vxlan->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2611 vxlan->saddr.sa.sa_family = AF_INET;
2612 } else if (data[IFLA_VXLAN_LOCAL6]) {
2613 if (!IS_ENABLED(CONFIG_IPV6))
2614 return -EPFNOSUPPORT;
2615
2616 /* TODO: respect scope id */
2617 vxlan->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2618 vxlan->saddr.sa.sa_family = AF_INET6;
2619 use_ipv6 = true;
2620 }
2621
2622 if (data[IFLA_VXLAN_LINK] &&
2623 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2624 struct net_device *lowerdev
2625 = __dev_get_by_index(src_net, dst->remote_ifindex);
2626
2627 if (!lowerdev) {
2628 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2629 return -ENODEV;
2630 }
2631
2632 #if IS_ENABLED(CONFIG_IPV6)
2633 if (use_ipv6) {
2634 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2635 if (idev && idev->cnf.disable_ipv6) {
2636 pr_info("IPv6 is disabled via sysctl\n");
2637 return -EPERM;
2638 }
2639 vxlan->flags |= VXLAN_F_IPV6;
2640 }
2641 #endif
2642
2643 if (!tb[IFLA_MTU])
2644 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2645
2646 dev->needed_headroom = lowerdev->hard_header_len +
2647 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2648 } else if (use_ipv6)
2649 vxlan->flags |= VXLAN_F_IPV6;
2650
2651 if (data[IFLA_VXLAN_TOS])
2652 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2653
2654 if (data[IFLA_VXLAN_TTL])
2655 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2656
2657 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2658 vxlan->flags |= VXLAN_F_LEARN;
2659
2660 if (data[IFLA_VXLAN_AGEING])
2661 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2662 else
2663 vxlan->age_interval = FDB_AGE_DEFAULT;
2664
2665 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2666 vxlan->flags |= VXLAN_F_PROXY;
2667
2668 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2669 vxlan->flags |= VXLAN_F_RSC;
2670
2671 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2672 vxlan->flags |= VXLAN_F_L2MISS;
2673
2674 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2675 vxlan->flags |= VXLAN_F_L3MISS;
2676
2677 if (data[IFLA_VXLAN_LIMIT])
2678 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2679
2680 if (data[IFLA_VXLAN_PORT_RANGE]) {
2681 const struct ifla_vxlan_port_range *p
2682 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2683 vxlan->port_min = ntohs(p->low);
2684 vxlan->port_max = ntohs(p->high);
2685 }
2686
2687 if (data[IFLA_VXLAN_PORT])
2688 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2689
2690 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2691 vxlan->flags |= VXLAN_F_UDP_CSUM;
2692
2693 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2694 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2695 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2696
2697 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2698 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2699 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2700
2701 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2702 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2703 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2704
2705 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2706 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2707 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2708
2709 if (data[IFLA_VXLAN_GBP])
2710 vxlan->flags |= VXLAN_F_GBP;
2711
2712 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2713 vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2714
2715 if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2716 vxlan->dst_port, vxlan->flags)) {
2717 pr_info("duplicate VNI %u\n", vni);
2718 return -EEXIST;
2719 }
2720
2721 dev->ethtool_ops = &vxlan_ethtool_ops;
2722
2723 /* create an fdb entry for a valid default destination */
2724 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2725 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2726 &vxlan->default_dst.remote_ip,
2727 NUD_REACHABLE|NUD_PERMANENT,
2728 NLM_F_EXCL|NLM_F_CREATE,
2729 vxlan->dst_port,
2730 vxlan->default_dst.remote_vni,
2731 vxlan->default_dst.remote_ifindex,
2732 NTF_SELF);
2733 if (err)
2734 return err;
2735 }
2736
2737 err = register_netdevice(dev);
2738 if (err) {
2739 vxlan_fdb_delete_default(vxlan);
2740 return err;
2741 }
2742
2743 list_add(&vxlan->next, &vn->vxlan_list);
2744
2745 return 0;
2746 }
2747
2748 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2749 {
2750 struct vxlan_dev *vxlan = netdev_priv(dev);
2751 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2752
2753 spin_lock(&vn->sock_lock);
2754 if (!hlist_unhashed(&vxlan->hlist))
2755 hlist_del_rcu(&vxlan->hlist);
2756 spin_unlock(&vn->sock_lock);
2757
2758 list_del(&vxlan->next);
2759 unregister_netdevice_queue(dev, head);
2760 }
2761
2762 static size_t vxlan_get_size(const struct net_device *dev)
2763 {
2764
2765 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2766 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2767 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2768 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2769 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2770 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2771 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2772 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2773 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2774 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2775 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2776 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2777 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2778 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2779 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2780 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2781 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2782 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2783 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2784 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2785 0;
2786 }
2787
2788 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2789 {
2790 const struct vxlan_dev *vxlan = netdev_priv(dev);
2791 const struct vxlan_rdst *dst = &vxlan->default_dst;
2792 struct ifla_vxlan_port_range ports = {
2793 .low = htons(vxlan->port_min),
2794 .high = htons(vxlan->port_max),
2795 };
2796
2797 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2798 goto nla_put_failure;
2799
2800 if (!vxlan_addr_any(&dst->remote_ip)) {
2801 if (dst->remote_ip.sa.sa_family == AF_INET) {
2802 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
2803 dst->remote_ip.sin.sin_addr.s_addr))
2804 goto nla_put_failure;
2805 #if IS_ENABLED(CONFIG_IPV6)
2806 } else {
2807 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
2808 &dst->remote_ip.sin6.sin6_addr))
2809 goto nla_put_failure;
2810 #endif
2811 }
2812 }
2813
2814 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2815 goto nla_put_failure;
2816
2817 if (!vxlan_addr_any(&vxlan->saddr)) {
2818 if (vxlan->saddr.sa.sa_family == AF_INET) {
2819 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
2820 vxlan->saddr.sin.sin_addr.s_addr))
2821 goto nla_put_failure;
2822 #if IS_ENABLED(CONFIG_IPV6)
2823 } else {
2824 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
2825 &vxlan->saddr.sin6.sin6_addr))
2826 goto nla_put_failure;
2827 #endif
2828 }
2829 }
2830
2831 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2832 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2833 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2834 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2835 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2836 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2837 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2838 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2839 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2840 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2841 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2842 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2843 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2844 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2845 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2846 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2847 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2848 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2849 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2850 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2851 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2852 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2853 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2854 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2855 goto nla_put_failure;
2856
2857 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2858 goto nla_put_failure;
2859
2860 if (vxlan->flags & VXLAN_F_GBP &&
2861 nla_put_flag(skb, IFLA_VXLAN_GBP))
2862 goto nla_put_failure;
2863
2864 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2865 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2866 goto nla_put_failure;
2867
2868 return 0;
2869
2870 nla_put_failure:
2871 return -EMSGSIZE;
2872 }
2873
2874 static struct net *vxlan_get_link_net(const struct net_device *dev)
2875 {
2876 struct vxlan_dev *vxlan = netdev_priv(dev);
2877
2878 return vxlan->net;
2879 }
2880
2881 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2882 .kind = "vxlan",
2883 .maxtype = IFLA_VXLAN_MAX,
2884 .policy = vxlan_policy,
2885 .priv_size = sizeof(struct vxlan_dev),
2886 .setup = vxlan_setup,
2887 .validate = vxlan_validate,
2888 .newlink = vxlan_newlink,
2889 .dellink = vxlan_dellink,
2890 .get_size = vxlan_get_size,
2891 .fill_info = vxlan_fill_info,
2892 .get_link_net = vxlan_get_link_net,
2893 };
2894
2895 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2896 struct net_device *dev)
2897 {
2898 struct vxlan_dev *vxlan, *next;
2899 LIST_HEAD(list_kill);
2900
2901 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2902 struct vxlan_rdst *dst = &vxlan->default_dst;
2903
2904 /* In case we created vxlan device with carrier
2905 * and we loose the carrier due to module unload
2906 * we also need to remove vxlan device. In other
2907 * cases, it's not necessary and remote_ifindex
2908 * is 0 here, so no matches.
2909 */
2910 if (dst->remote_ifindex == dev->ifindex)
2911 vxlan_dellink(vxlan->dev, &list_kill);
2912 }
2913
2914 unregister_netdevice_many(&list_kill);
2915 }
2916
2917 static int vxlan_lowerdev_event(struct notifier_block *unused,
2918 unsigned long event, void *ptr)
2919 {
2920 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2921 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2922
2923 if (event == NETDEV_UNREGISTER)
2924 vxlan_handle_lowerdev_unregister(vn, dev);
2925
2926 return NOTIFY_DONE;
2927 }
2928
2929 static struct notifier_block vxlan_notifier_block __read_mostly = {
2930 .notifier_call = vxlan_lowerdev_event,
2931 };
2932
2933 static __net_init int vxlan_init_net(struct net *net)
2934 {
2935 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2936 unsigned int h;
2937
2938 INIT_LIST_HEAD(&vn->vxlan_list);
2939 spin_lock_init(&vn->sock_lock);
2940
2941 for (h = 0; h < PORT_HASH_SIZE; ++h)
2942 INIT_HLIST_HEAD(&vn->sock_list[h]);
2943
2944 return 0;
2945 }
2946
2947 static void __net_exit vxlan_exit_net(struct net *net)
2948 {
2949 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2950 struct vxlan_dev *vxlan, *next;
2951 struct net_device *dev, *aux;
2952 LIST_HEAD(list);
2953
2954 rtnl_lock();
2955 for_each_netdev_safe(net, dev, aux)
2956 if (dev->rtnl_link_ops == &vxlan_link_ops)
2957 unregister_netdevice_queue(dev, &list);
2958
2959 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2960 /* If vxlan->dev is in the same netns, it has already been added
2961 * to the list by the previous loop.
2962 */
2963 if (!net_eq(dev_net(vxlan->dev), net))
2964 unregister_netdevice_queue(vxlan->dev, &list);
2965 }
2966
2967 unregister_netdevice_many(&list);
2968 rtnl_unlock();
2969 }
2970
2971 static struct pernet_operations vxlan_net_ops = {
2972 .init = vxlan_init_net,
2973 .exit = vxlan_exit_net,
2974 .id = &vxlan_net_id,
2975 .size = sizeof(struct vxlan_net),
2976 };
2977
2978 static int __init vxlan_init_module(void)
2979 {
2980 int rc;
2981
2982 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2983 if (!vxlan_wq)
2984 return -ENOMEM;
2985
2986 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2987
2988 rc = register_pernet_subsys(&vxlan_net_ops);
2989 if (rc)
2990 goto out1;
2991
2992 rc = register_netdevice_notifier(&vxlan_notifier_block);
2993 if (rc)
2994 goto out2;
2995
2996 rc = rtnl_link_register(&vxlan_link_ops);
2997 if (rc)
2998 goto out3;
2999
3000 return 0;
3001 out3:
3002 unregister_netdevice_notifier(&vxlan_notifier_block);
3003 out2:
3004 unregister_pernet_subsys(&vxlan_net_ops);
3005 out1:
3006 destroy_workqueue(vxlan_wq);
3007 return rc;
3008 }
3009 late_initcall(vxlan_init_module);
3010
3011 static void __exit vxlan_cleanup_module(void)
3012 {
3013 rtnl_link_unregister(&vxlan_link_ops);
3014 unregister_netdevice_notifier(&vxlan_notifier_block);
3015 destroy_workqueue(vxlan_wq);
3016 unregister_pernet_subsys(&vxlan_net_ops);
3017 /* rcu_barrier() is called by netns */
3018 }
3019 module_exit(vxlan_cleanup_module);
3020
3021 MODULE_LICENSE("GPL");
3022 MODULE_VERSION(VXLAN_VERSION);
3023 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3024 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3025 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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