?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'regmap-fix-v4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / net / vxlan.c
blobf3c2fa3ab0d54197c6e2f3ad27dcf6db7ef84257
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/vxlan.h>
30
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
34 #endif
35
36 #define VXLAN_VERSION "0.1"
37
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
42
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
46 */
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
50
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
54
55 static int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
57
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
59
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
61
62 /* per-network namespace private data for this module */
63 struct vxlan_net {
64 struct list_head vxlan_list;
65 struct hlist_head sock_list[PORT_HASH_SIZE];
66 spinlock_t sock_lock;
67 };
68
69 /* Forwarding table entry */
70 struct vxlan_fdb {
71 struct hlist_node hlist; /* linked list of entries */
72 struct rcu_head rcu;
73 unsigned long updated; /* jiffies */
74 unsigned long used;
75 struct list_head remotes;
76 u8 eth_addr[ETH_ALEN];
77 u16 state; /* see ndm_state */
78 u8 flags; /* see ndm_flags */
79 };
80
81 /* salt for hash table */
82 static u32 vxlan_salt __read_mostly;
83
84 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
85 {
86 return vs->flags & VXLAN_F_COLLECT_METADATA ||
87 ip_tunnel_collect_metadata();
88 }
89
90 #if IS_ENABLED(CONFIG_IPV6)
91 static inline
92 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
93 {
94 if (a->sa.sa_family != b->sa.sa_family)
95 return false;
96 if (a->sa.sa_family == AF_INET6)
97 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
98 else
99 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
100 }
101
102 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
103 {
104 if (ipa->sa.sa_family == AF_INET6)
105 return ipv6_addr_any(&ipa->sin6.sin6_addr);
106 else
107 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
108 }
109
110 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
111 {
112 if (ipa->sa.sa_family == AF_INET6)
113 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
114 else
115 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
116 }
117
118 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
119 {
120 if (nla_len(nla) >= sizeof(struct in6_addr)) {
121 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
122 ip->sa.sa_family = AF_INET6;
123 return 0;
124 } else if (nla_len(nla) >= sizeof(__be32)) {
125 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
126 ip->sa.sa_family = AF_INET;
127 return 0;
128 } else {
129 return -EAFNOSUPPORT;
130 }
131 }
132
133 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
134 const union vxlan_addr *ip)
135 {
136 if (ip->sa.sa_family == AF_INET6)
137 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
138 else
139 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
140 }
141
142 #else /* !CONFIG_IPV6 */
143
144 static inline
145 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
146 {
147 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
148 }
149
150 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
151 {
152 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
153 }
154
155 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
156 {
157 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
158 }
159
160 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
161 {
162 if (nla_len(nla) >= sizeof(struct in6_addr)) {
163 return -EAFNOSUPPORT;
164 } else if (nla_len(nla) >= sizeof(__be32)) {
165 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
166 ip->sa.sa_family = AF_INET;
167 return 0;
168 } else {
169 return -EAFNOSUPPORT;
170 }
171 }
172
173 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
174 const union vxlan_addr *ip)
175 {
176 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
177 }
178 #endif
179
180 /* Virtual Network hash table head */
181 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
182 {
183 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
184 }
185
186 /* Socket hash table head */
187 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
188 {
189 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
190
191 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
192 }
193
194 /* First remote destination for a forwarding entry.
195 * Guaranteed to be non-NULL because remotes are never deleted.
196 */
197 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
198 {
199 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
200 }
201
202 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
203 {
204 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
205 }
206
207 /* Find VXLAN socket based on network namespace, address family and UDP port
208 * and enabled unshareable flags.
209 */
210 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
211 __be16 port, u32 flags)
212 {
213 struct vxlan_sock *vs;
214
215 flags &= VXLAN_F_RCV_FLAGS;
216
217 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
218 if (inet_sk(vs->sock->sk)->inet_sport == port &&
219 vxlan_get_sk_family(vs) == family &&
220 vs->flags == flags)
221 return vs;
222 }
223 return NULL;
224 }
225
226 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
227 {
228 struct vxlan_dev *vxlan;
229
230 /* For flow based devices, map all packets to VNI 0 */
231 if (vs->flags & VXLAN_F_COLLECT_METADATA)
232 vni = 0;
233
234 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
235 if (vxlan->default_dst.remote_vni == vni)
236 return vxlan;
237 }
238
239 return NULL;
240 }
241
242 /* Look up VNI in a per net namespace table */
243 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
244 sa_family_t family, __be16 port,
245 u32 flags)
246 {
247 struct vxlan_sock *vs;
248
249 vs = vxlan_find_sock(net, family, port, flags);
250 if (!vs)
251 return NULL;
252
253 return vxlan_vs_find_vni(vs, vni);
254 }
255
256 /* Fill in neighbour message in skbuff. */
257 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
258 const struct vxlan_fdb *fdb,
259 u32 portid, u32 seq, int type, unsigned int flags,
260 const struct vxlan_rdst *rdst)
261 {
262 unsigned long now = jiffies;
263 struct nda_cacheinfo ci;
264 struct nlmsghdr *nlh;
265 struct ndmsg *ndm;
266 bool send_ip, send_eth;
267
268 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
269 if (nlh == NULL)
270 return -EMSGSIZE;
271
272 ndm = nlmsg_data(nlh);
273 memset(ndm, 0, sizeof(*ndm));
274
275 send_eth = send_ip = true;
276
277 if (type == RTM_GETNEIGH) {
278 ndm->ndm_family = AF_INET;
279 send_ip = !vxlan_addr_any(&rdst->remote_ip);
280 send_eth = !is_zero_ether_addr(fdb->eth_addr);
281 } else
282 ndm->ndm_family = AF_BRIDGE;
283 ndm->ndm_state = fdb->state;
284 ndm->ndm_ifindex = vxlan->dev->ifindex;
285 ndm->ndm_flags = fdb->flags;
286 ndm->ndm_type = RTN_UNICAST;
287
288 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
289 nla_put_s32(skb, NDA_LINK_NETNSID,
290 peernet2id(dev_net(vxlan->dev), vxlan->net)))
291 goto nla_put_failure;
292
293 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
294 goto nla_put_failure;
295
296 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
297 goto nla_put_failure;
298
299 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
300 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
301 goto nla_put_failure;
302 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
303 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
304 goto nla_put_failure;
305 if (rdst->remote_ifindex &&
306 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
307 goto nla_put_failure;
308
309 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
310 ci.ndm_confirmed = 0;
311 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
312 ci.ndm_refcnt = 0;
313
314 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
315 goto nla_put_failure;
316
317 nlmsg_end(skb, nlh);
318 return 0;
319
320 nla_put_failure:
321 nlmsg_cancel(skb, nlh);
322 return -EMSGSIZE;
323 }
324
325 static inline size_t vxlan_nlmsg_size(void)
326 {
327 return NLMSG_ALIGN(sizeof(struct ndmsg))
328 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
329 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
330 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
331 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
332 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
333 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
334 + nla_total_size(sizeof(struct nda_cacheinfo));
335 }
336
337 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
338 struct vxlan_rdst *rd, int type)
339 {
340 struct net *net = dev_net(vxlan->dev);
341 struct sk_buff *skb;
342 int err = -ENOBUFS;
343
344 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
345 if (skb == NULL)
346 goto errout;
347
348 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
349 if (err < 0) {
350 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
351 WARN_ON(err == -EMSGSIZE);
352 kfree_skb(skb);
353 goto errout;
354 }
355
356 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
357 return;
358 errout:
359 if (err < 0)
360 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
361 }
362
363 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
364 {
365 struct vxlan_dev *vxlan = netdev_priv(dev);
366 struct vxlan_fdb f = {
367 .state = NUD_STALE,
368 };
369 struct vxlan_rdst remote = {
370 .remote_ip = *ipa, /* goes to NDA_DST */
371 .remote_vni = cpu_to_be32(VXLAN_N_VID),
372 };
373
374 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
375 }
376
377 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
378 {
379 struct vxlan_fdb f = {
380 .state = NUD_STALE,
381 };
382 struct vxlan_rdst remote = { };
383
384 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
385
386 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
387 }
388
389 /* Hash Ethernet address */
390 static u32 eth_hash(const unsigned char *addr)
391 {
392 u64 value = get_unaligned((u64 *)addr);
393
394 /* only want 6 bytes */
395 #ifdef __BIG_ENDIAN
396 value >>= 16;
397 #else
398 value <<= 16;
399 #endif
400 return hash_64(value, FDB_HASH_BITS);
401 }
402
403 /* Hash chain to use given mac address */
404 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
405 const u8 *mac)
406 {
407 return &vxlan->fdb_head[eth_hash(mac)];
408 }
409
410 /* Look up Ethernet address in forwarding table */
411 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
412 const u8 *mac)
413 {
414 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
415 struct vxlan_fdb *f;
416
417 hlist_for_each_entry_rcu(f, head, hlist) {
418 if (ether_addr_equal(mac, f->eth_addr))
419 return f;
420 }
421
422 return NULL;
423 }
424
425 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
426 const u8 *mac)
427 {
428 struct vxlan_fdb *f;
429
430 f = __vxlan_find_mac(vxlan, mac);
431 if (f)
432 f->used = jiffies;
433
434 return f;
435 }
436
437 /* caller should hold vxlan->hash_lock */
438 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
439 union vxlan_addr *ip, __be16 port,
440 __be32 vni, __u32 ifindex)
441 {
442 struct vxlan_rdst *rd;
443
444 list_for_each_entry(rd, &f->remotes, list) {
445 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
446 rd->remote_port == port &&
447 rd->remote_vni == vni &&
448 rd->remote_ifindex == ifindex)
449 return rd;
450 }
451
452 return NULL;
453 }
454
455 /* Replace destination of unicast mac */
456 static int vxlan_fdb_replace(struct vxlan_fdb *f,
457 union vxlan_addr *ip, __be16 port, __be32 vni,
458 __u32 ifindex)
459 {
460 struct vxlan_rdst *rd;
461
462 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
463 if (rd)
464 return 0;
465
466 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
467 if (!rd)
468 return 0;
469
470 dst_cache_reset(&rd->dst_cache);
471 rd->remote_ip = *ip;
472 rd->remote_port = port;
473 rd->remote_vni = vni;
474 rd->remote_ifindex = ifindex;
475 return 1;
476 }
477
478 /* Add/update destinations for multicast */
479 static int vxlan_fdb_append(struct vxlan_fdb *f,
480 union vxlan_addr *ip, __be16 port, __be32 vni,
481 __u32 ifindex, struct vxlan_rdst **rdp)
482 {
483 struct vxlan_rdst *rd;
484
485 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
486 if (rd)
487 return 0;
488
489 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
490 if (rd == NULL)
491 return -ENOBUFS;
492
493 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
494 kfree(rd);
495 return -ENOBUFS;
496 }
497
498 rd->remote_ip = *ip;
499 rd->remote_port = port;
500 rd->remote_vni = vni;
501 rd->remote_ifindex = ifindex;
502
503 list_add_tail_rcu(&rd->list, &f->remotes);
504
505 *rdp = rd;
506 return 1;
507 }
508
509 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
510 unsigned int off,
511 struct vxlanhdr *vh, size_t hdrlen,
512 __be32 vni_field,
513 struct gro_remcsum *grc,
514 bool nopartial)
515 {
516 size_t start, offset;
517
518 if (skb->remcsum_offload)
519 return vh;
520
521 if (!NAPI_GRO_CB(skb)->csum_valid)
522 return NULL;
523
524 start = vxlan_rco_start(vni_field);
525 offset = start + vxlan_rco_offset(vni_field);
526
527 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
528 start, offset, grc, nopartial);
529
530 skb->remcsum_offload = 1;
531
532 return vh;
533 }
534
535 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
536 struct sk_buff **head,
537 struct sk_buff *skb)
538 {
539 struct sk_buff *p, **pp = NULL;
540 struct vxlanhdr *vh, *vh2;
541 unsigned int hlen, off_vx;
542 int flush = 1;
543 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
544 __be32 flags;
545 struct gro_remcsum grc;
546
547 skb_gro_remcsum_init(&grc);
548
549 off_vx = skb_gro_offset(skb);
550 hlen = off_vx + sizeof(*vh);
551 vh = skb_gro_header_fast(skb, off_vx);
552 if (skb_gro_header_hard(skb, hlen)) {
553 vh = skb_gro_header_slow(skb, hlen, off_vx);
554 if (unlikely(!vh))
555 goto out;
556 }
557
558 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
559
560 flags = vh->vx_flags;
561
562 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
563 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
564 vh->vx_vni, &grc,
565 !!(vs->flags &
566 VXLAN_F_REMCSUM_NOPARTIAL));
567
568 if (!vh)
569 goto out;
570 }
571
572 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
573
574 for (p = *head; p; p = p->next) {
575 if (!NAPI_GRO_CB(p)->same_flow)
576 continue;
577
578 vh2 = (struct vxlanhdr *)(p->data + off_vx);
579 if (vh->vx_flags != vh2->vx_flags ||
580 vh->vx_vni != vh2->vx_vni) {
581 NAPI_GRO_CB(p)->same_flow = 0;
582 continue;
583 }
584 }
585
586 pp = call_gro_receive(eth_gro_receive, head, skb);
587 flush = 0;
588
589 out:
590 skb_gro_remcsum_cleanup(skb, &grc);
591 NAPI_GRO_CB(skb)->flush |= flush;
592
593 return pp;
594 }
595
596 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
597 {
598 /* Sets 'skb->inner_mac_header' since we are always called with
599 * 'skb->encapsulation' set.
600 */
601 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
602 }
603
604 /* Add new entry to forwarding table -- assumes lock held */
605 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
606 const u8 *mac, union vxlan_addr *ip,
607 __u16 state, __u16 flags,
608 __be16 port, __be32 vni, __u32 ifindex,
609 __u8 ndm_flags)
610 {
611 struct vxlan_rdst *rd = NULL;
612 struct vxlan_fdb *f;
613 int notify = 0;
614
615 f = __vxlan_find_mac(vxlan, mac);
616 if (f) {
617 if (flags & NLM_F_EXCL) {
618 netdev_dbg(vxlan->dev,
619 "lost race to create %pM\n", mac);
620 return -EEXIST;
621 }
622 if (f->state != state) {
623 f->state = state;
624 f->updated = jiffies;
625 notify = 1;
626 }
627 if (f->flags != ndm_flags) {
628 f->flags = ndm_flags;
629 f->updated = jiffies;
630 notify = 1;
631 }
632 if ((flags & NLM_F_REPLACE)) {
633 /* Only change unicasts */
634 if (!(is_multicast_ether_addr(f->eth_addr) ||
635 is_zero_ether_addr(f->eth_addr))) {
636 notify |= vxlan_fdb_replace(f, ip, port, vni,
637 ifindex);
638 } else
639 return -EOPNOTSUPP;
640 }
641 if ((flags & NLM_F_APPEND) &&
642 (is_multicast_ether_addr(f->eth_addr) ||
643 is_zero_ether_addr(f->eth_addr))) {
644 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
645 &rd);
646
647 if (rc < 0)
648 return rc;
649 notify |= rc;
650 }
651 } else {
652 if (!(flags & NLM_F_CREATE))
653 return -ENOENT;
654
655 if (vxlan->cfg.addrmax &&
656 vxlan->addrcnt >= vxlan->cfg.addrmax)
657 return -ENOSPC;
658
659 /* Disallow replace to add a multicast entry */
660 if ((flags & NLM_F_REPLACE) &&
661 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
662 return -EOPNOTSUPP;
663
664 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
665 f = kmalloc(sizeof(*f), GFP_ATOMIC);
666 if (!f)
667 return -ENOMEM;
668
669 notify = 1;
670 f->state = state;
671 f->flags = ndm_flags;
672 f->updated = f->used = jiffies;
673 INIT_LIST_HEAD(&f->remotes);
674 memcpy(f->eth_addr, mac, ETH_ALEN);
675
676 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
677
678 ++vxlan->addrcnt;
679 hlist_add_head_rcu(&f->hlist,
680 vxlan_fdb_head(vxlan, mac));
681 }
682
683 if (notify) {
684 if (rd == NULL)
685 rd = first_remote_rtnl(f);
686 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
687 }
688
689 return 0;
690 }
691
692 static void vxlan_fdb_free(struct rcu_head *head)
693 {
694 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
695 struct vxlan_rdst *rd, *nd;
696
697 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
698 dst_cache_destroy(&rd->dst_cache);
699 kfree(rd);
700 }
701 kfree(f);
702 }
703
704 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
705 {
706 netdev_dbg(vxlan->dev,
707 "delete %pM\n", f->eth_addr);
708
709 --vxlan->addrcnt;
710 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
711
712 hlist_del_rcu(&f->hlist);
713 call_rcu(&f->rcu, vxlan_fdb_free);
714 }
715
716 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
717 union vxlan_addr *ip, __be16 *port, __be32 *vni,
718 u32 *ifindex)
719 {
720 struct net *net = dev_net(vxlan->dev);
721 int err;
722
723 if (tb[NDA_DST]) {
724 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
725 if (err)
726 return err;
727 } else {
728 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
729 if (remote->sa.sa_family == AF_INET) {
730 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
731 ip->sa.sa_family = AF_INET;
732 #if IS_ENABLED(CONFIG_IPV6)
733 } else {
734 ip->sin6.sin6_addr = in6addr_any;
735 ip->sa.sa_family = AF_INET6;
736 #endif
737 }
738 }
739
740 if (tb[NDA_PORT]) {
741 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
742 return -EINVAL;
743 *port = nla_get_be16(tb[NDA_PORT]);
744 } else {
745 *port = vxlan->cfg.dst_port;
746 }
747
748 if (tb[NDA_VNI]) {
749 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
750 return -EINVAL;
751 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
752 } else {
753 *vni = vxlan->default_dst.remote_vni;
754 }
755
756 if (tb[NDA_IFINDEX]) {
757 struct net_device *tdev;
758
759 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
760 return -EINVAL;
761 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
762 tdev = __dev_get_by_index(net, *ifindex);
763 if (!tdev)
764 return -EADDRNOTAVAIL;
765 } else {
766 *ifindex = 0;
767 }
768
769 return 0;
770 }
771
772 /* Add static entry (via netlink) */
773 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
774 struct net_device *dev,
775 const unsigned char *addr, u16 vid, u16 flags)
776 {
777 struct vxlan_dev *vxlan = netdev_priv(dev);
778 /* struct net *net = dev_net(vxlan->dev); */
779 union vxlan_addr ip;
780 __be16 port;
781 __be32 vni;
782 u32 ifindex;
783 int err;
784
785 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
786 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
787 ndm->ndm_state);
788 return -EINVAL;
789 }
790
791 if (tb[NDA_DST] == NULL)
792 return -EINVAL;
793
794 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
795 if (err)
796 return err;
797
798 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
799 return -EAFNOSUPPORT;
800
801 spin_lock_bh(&vxlan->hash_lock);
802 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
803 port, vni, ifindex, ndm->ndm_flags);
804 spin_unlock_bh(&vxlan->hash_lock);
805
806 return err;
807 }
808
809 /* Delete entry (via netlink) */
810 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
811 struct net_device *dev,
812 const unsigned char *addr, u16 vid)
813 {
814 struct vxlan_dev *vxlan = netdev_priv(dev);
815 struct vxlan_fdb *f;
816 struct vxlan_rdst *rd = NULL;
817 union vxlan_addr ip;
818 __be16 port;
819 __be32 vni;
820 u32 ifindex;
821 int err;
822
823 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
824 if (err)
825 return err;
826
827 err = -ENOENT;
828
829 spin_lock_bh(&vxlan->hash_lock);
830 f = vxlan_find_mac(vxlan, addr);
831 if (!f)
832 goto out;
833
834 if (!vxlan_addr_any(&ip)) {
835 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
836 if (!rd)
837 goto out;
838 }
839
840 err = 0;
841
842 /* remove a destination if it's not the only one on the list,
843 * otherwise destroy the fdb entry
844 */
845 if (rd && !list_is_singular(&f->remotes)) {
846 list_del_rcu(&rd->list);
847 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
848 kfree_rcu(rd, rcu);
849 goto out;
850 }
851
852 vxlan_fdb_destroy(vxlan, f);
853
854 out:
855 spin_unlock_bh(&vxlan->hash_lock);
856
857 return err;
858 }
859
860 /* Dump forwarding table */
861 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
862 struct net_device *dev,
863 struct net_device *filter_dev, int *idx)
864 {
865 struct vxlan_dev *vxlan = netdev_priv(dev);
866 unsigned int h;
867 int err = 0;
868
869 for (h = 0; h < FDB_HASH_SIZE; ++h) {
870 struct vxlan_fdb *f;
871
872 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
873 struct vxlan_rdst *rd;
874
875 list_for_each_entry_rcu(rd, &f->remotes, list) {
876 if (*idx < cb->args[2])
877 goto skip;
878
879 err = vxlan_fdb_info(skb, vxlan, f,
880 NETLINK_CB(cb->skb).portid,
881 cb->nlh->nlmsg_seq,
882 RTM_NEWNEIGH,
883 NLM_F_MULTI, rd);
884 if (err < 0)
885 goto out;
886 skip:
887 *idx += 1;
888 }
889 }
890 }
891 out:
892 return err;
893 }
894
895 /* Watch incoming packets to learn mapping between Ethernet address
896 * and Tunnel endpoint.
897 * Return true if packet is bogus and should be dropped.
898 */
899 static bool vxlan_snoop(struct net_device *dev,
900 union vxlan_addr *src_ip, const u8 *src_mac)
901 {
902 struct vxlan_dev *vxlan = netdev_priv(dev);
903 struct vxlan_fdb *f;
904
905 f = vxlan_find_mac(vxlan, src_mac);
906 if (likely(f)) {
907 struct vxlan_rdst *rdst = first_remote_rcu(f);
908
909 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
910 return false;
911
912 /* Don't migrate static entries, drop packets */
913 if (f->state & NUD_NOARP)
914 return true;
915
916 if (net_ratelimit())
917 netdev_info(dev,
918 "%pM migrated from %pIS to %pIS\n",
919 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
920
921 rdst->remote_ip = *src_ip;
922 f->updated = jiffies;
923 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
924 } else {
925 /* learned new entry */
926 spin_lock(&vxlan->hash_lock);
927
928 /* close off race between vxlan_flush and incoming packets */
929 if (netif_running(dev))
930 vxlan_fdb_create(vxlan, src_mac, src_ip,
931 NUD_REACHABLE,
932 NLM_F_EXCL|NLM_F_CREATE,
933 vxlan->cfg.dst_port,
934 vxlan->default_dst.remote_vni,
935 0, NTF_SELF);
936 spin_unlock(&vxlan->hash_lock);
937 }
938
939 return false;
940 }
941
942 /* See if multicast group is already in use by other ID */
943 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
944 {
945 struct vxlan_dev *vxlan;
946 struct vxlan_sock *sock4;
947 struct vxlan_sock *sock6 = NULL;
948 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
949
950 sock4 = rtnl_dereference(dev->vn4_sock);
951
952 /* The vxlan_sock is only used by dev, leaving group has
953 * no effect on other vxlan devices.
954 */
955 if (family == AF_INET && sock4 && atomic_read(&sock4->refcnt) == 1)
956 return false;
957 #if IS_ENABLED(CONFIG_IPV6)
958 sock6 = rtnl_dereference(dev->vn6_sock);
959 if (family == AF_INET6 && sock6 && atomic_read(&sock6->refcnt) == 1)
960 return false;
961 #endif
962
963 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
964 if (!netif_running(vxlan->dev) || vxlan == dev)
965 continue;
966
967 if (family == AF_INET &&
968 rtnl_dereference(vxlan->vn4_sock) != sock4)
969 continue;
970 #if IS_ENABLED(CONFIG_IPV6)
971 if (family == AF_INET6 &&
972 rtnl_dereference(vxlan->vn6_sock) != sock6)
973 continue;
974 #endif
975
976 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
977 &dev->default_dst.remote_ip))
978 continue;
979
980 if (vxlan->default_dst.remote_ifindex !=
981 dev->default_dst.remote_ifindex)
982 continue;
983
984 return true;
985 }
986
987 return false;
988 }
989
990 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
991 {
992 struct vxlan_net *vn;
993
994 if (!vs)
995 return false;
996 if (!atomic_dec_and_test(&vs->refcnt))
997 return false;
998
999 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1000 spin_lock(&vn->sock_lock);
1001 hlist_del_rcu(&vs->hlist);
1002 udp_tunnel_notify_del_rx_port(vs->sock,
1003 (vs->flags & VXLAN_F_GPE) ?
1004 UDP_TUNNEL_TYPE_VXLAN_GPE :
1005 UDP_TUNNEL_TYPE_VXLAN);
1006 spin_unlock(&vn->sock_lock);
1007
1008 return true;
1009 }
1010
1011 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1012 {
1013 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1014 #if IS_ENABLED(CONFIG_IPV6)
1015 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1016
1017 rcu_assign_pointer(vxlan->vn6_sock, NULL);
1018 #endif
1019
1020 rcu_assign_pointer(vxlan->vn4_sock, NULL);
1021 synchronize_net();
1022
1023 if (__vxlan_sock_release_prep(sock4)) {
1024 udp_tunnel_sock_release(sock4->sock);
1025 kfree(sock4);
1026 }
1027
1028 #if IS_ENABLED(CONFIG_IPV6)
1029 if (__vxlan_sock_release_prep(sock6)) {
1030 udp_tunnel_sock_release(sock6->sock);
1031 kfree(sock6);
1032 }
1033 #endif
1034 }
1035
1036 /* Update multicast group membership when first VNI on
1037 * multicast address is brought up
1038 */
1039 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1040 {
1041 struct sock *sk;
1042 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1043 int ifindex = vxlan->default_dst.remote_ifindex;
1044 int ret = -EINVAL;
1045
1046 if (ip->sa.sa_family == AF_INET) {
1047 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1048 struct ip_mreqn mreq = {
1049 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1050 .imr_ifindex = ifindex,
1051 };
1052
1053 sk = sock4->sock->sk;
1054 lock_sock(sk);
1055 ret = ip_mc_join_group(sk, &mreq);
1056 release_sock(sk);
1057 #if IS_ENABLED(CONFIG_IPV6)
1058 } else {
1059 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1060
1061 sk = sock6->sock->sk;
1062 lock_sock(sk);
1063 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1064 &ip->sin6.sin6_addr);
1065 release_sock(sk);
1066 #endif
1067 }
1068
1069 return ret;
1070 }
1071
1072 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1073 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1074 {
1075 struct sock *sk;
1076 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1077 int ifindex = vxlan->default_dst.remote_ifindex;
1078 int ret = -EINVAL;
1079
1080 if (ip->sa.sa_family == AF_INET) {
1081 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1082 struct ip_mreqn mreq = {
1083 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1084 .imr_ifindex = ifindex,
1085 };
1086
1087 sk = sock4->sock->sk;
1088 lock_sock(sk);
1089 ret = ip_mc_leave_group(sk, &mreq);
1090 release_sock(sk);
1091 #if IS_ENABLED(CONFIG_IPV6)
1092 } else {
1093 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1094
1095 sk = sock6->sock->sk;
1096 lock_sock(sk);
1097 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1098 &ip->sin6.sin6_addr);
1099 release_sock(sk);
1100 #endif
1101 }
1102
1103 return ret;
1104 }
1105
1106 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1107 struct sk_buff *skb, u32 vxflags)
1108 {
1109 size_t start, offset;
1110
1111 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1112 goto out;
1113
1114 start = vxlan_rco_start(unparsed->vx_vni);
1115 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1116
1117 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1118 return false;
1119
1120 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1121 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1122 out:
1123 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1124 unparsed->vx_vni &= VXLAN_VNI_MASK;
1125 return true;
1126 }
1127
1128 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1129 struct sk_buff *skb, u32 vxflags,
1130 struct vxlan_metadata *md)
1131 {
1132 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1133 struct metadata_dst *tun_dst;
1134
1135 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1136 goto out;
1137
1138 md->gbp = ntohs(gbp->policy_id);
1139
1140 tun_dst = (struct metadata_dst *)skb_dst(skb);
1141 if (tun_dst) {
1142 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1143 tun_dst->u.tun_info.options_len = sizeof(*md);
1144 }
1145 if (gbp->dont_learn)
1146 md->gbp |= VXLAN_GBP_DONT_LEARN;
1147
1148 if (gbp->policy_applied)
1149 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1150
1151 /* In flow-based mode, GBP is carried in dst_metadata */
1152 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1153 skb->mark = md->gbp;
1154 out:
1155 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1156 }
1157
1158 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1159 __be16 *protocol,
1160 struct sk_buff *skb, u32 vxflags)
1161 {
1162 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1163
1164 /* Need to have Next Protocol set for interfaces in GPE mode. */
1165 if (!gpe->np_applied)
1166 return false;
1167 /* "The initial version is 0. If a receiver does not support the
1168 * version indicated it MUST drop the packet.
1169 */
1170 if (gpe->version != 0)
1171 return false;
1172 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1173 * processing MUST occur." However, we don't implement OAM
1174 * processing, thus drop the packet.
1175 */
1176 if (gpe->oam_flag)
1177 return false;
1178
1179 switch (gpe->next_protocol) {
1180 case VXLAN_GPE_NP_IPV4:
1181 *protocol = htons(ETH_P_IP);
1182 break;
1183 case VXLAN_GPE_NP_IPV6:
1184 *protocol = htons(ETH_P_IPV6);
1185 break;
1186 case VXLAN_GPE_NP_ETHERNET:
1187 *protocol = htons(ETH_P_TEB);
1188 break;
1189 default:
1190 return false;
1191 }
1192
1193 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1194 return true;
1195 }
1196
1197 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1198 struct vxlan_sock *vs,
1199 struct sk_buff *skb)
1200 {
1201 union vxlan_addr saddr;
1202
1203 skb_reset_mac_header(skb);
1204 skb->protocol = eth_type_trans(skb, vxlan->dev);
1205 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1206
1207 /* Ignore packet loops (and multicast echo) */
1208 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1209 return false;
1210
1211 /* Get address from the outer IP header */
1212 if (vxlan_get_sk_family(vs) == AF_INET) {
1213 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1214 saddr.sa.sa_family = AF_INET;
1215 #if IS_ENABLED(CONFIG_IPV6)
1216 } else {
1217 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1218 saddr.sa.sa_family = AF_INET6;
1219 #endif
1220 }
1221
1222 if ((vxlan->flags & VXLAN_F_LEARN) &&
1223 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1224 return false;
1225
1226 return true;
1227 }
1228
1229 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1230 struct sk_buff *skb)
1231 {
1232 int err = 0;
1233
1234 if (vxlan_get_sk_family(vs) == AF_INET)
1235 err = IP_ECN_decapsulate(oiph, skb);
1236 #if IS_ENABLED(CONFIG_IPV6)
1237 else
1238 err = IP6_ECN_decapsulate(oiph, skb);
1239 #endif
1240
1241 if (unlikely(err) && log_ecn_error) {
1242 if (vxlan_get_sk_family(vs) == AF_INET)
1243 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1244 &((struct iphdr *)oiph)->saddr,
1245 ((struct iphdr *)oiph)->tos);
1246 else
1247 net_info_ratelimited("non-ECT from %pI6\n",
1248 &((struct ipv6hdr *)oiph)->saddr);
1249 }
1250 return err <= 1;
1251 }
1252
1253 /* Callback from net/ipv4/udp.c to receive packets */
1254 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1255 {
1256 struct pcpu_sw_netstats *stats;
1257 struct vxlan_dev *vxlan;
1258 struct vxlan_sock *vs;
1259 struct vxlanhdr unparsed;
1260 struct vxlan_metadata _md;
1261 struct vxlan_metadata *md = &_md;
1262 __be16 protocol = htons(ETH_P_TEB);
1263 bool raw_proto = false;
1264 void *oiph;
1265
1266 /* Need UDP and VXLAN header to be present */
1267 if (!pskb_may_pull(skb, VXLAN_HLEN))
1268 goto drop;
1269
1270 unparsed = *vxlan_hdr(skb);
1271 /* VNI flag always required to be set */
1272 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1273 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1274 ntohl(vxlan_hdr(skb)->vx_flags),
1275 ntohl(vxlan_hdr(skb)->vx_vni));
1276 /* Return non vxlan pkt */
1277 goto drop;
1278 }
1279 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1280 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1281
1282 vs = rcu_dereference_sk_user_data(sk);
1283 if (!vs)
1284 goto drop;
1285
1286 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1287 if (!vxlan)
1288 goto drop;
1289
1290 /* For backwards compatibility, only allow reserved fields to be
1291 * used by VXLAN extensions if explicitly requested.
1292 */
1293 if (vs->flags & VXLAN_F_GPE) {
1294 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1295 goto drop;
1296 raw_proto = true;
1297 }
1298
1299 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1300 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1301 goto drop;
1302
1303 if (vxlan_collect_metadata(vs)) {
1304 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1305 struct metadata_dst *tun_dst;
1306
1307 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1308 key32_to_tunnel_id(vni), sizeof(*md));
1309
1310 if (!tun_dst)
1311 goto drop;
1312
1313 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1314
1315 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1316 } else {
1317 memset(md, 0, sizeof(*md));
1318 }
1319
1320 if (vs->flags & VXLAN_F_REMCSUM_RX)
1321 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1322 goto drop;
1323 if (vs->flags & VXLAN_F_GBP)
1324 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1325 /* Note that GBP and GPE can never be active together. This is
1326 * ensured in vxlan_dev_configure.
1327 */
1328
1329 if (unparsed.vx_flags || unparsed.vx_vni) {
1330 /* If there are any unprocessed flags remaining treat
1331 * this as a malformed packet. This behavior diverges from
1332 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1333 * in reserved fields are to be ignored. The approach here
1334 * maintains compatibility with previous stack code, and also
1335 * is more robust and provides a little more security in
1336 * adding extensions to VXLAN.
1337 */
1338 goto drop;
1339 }
1340
1341 if (!raw_proto) {
1342 if (!vxlan_set_mac(vxlan, vs, skb))
1343 goto drop;
1344 } else {
1345 skb_reset_mac_header(skb);
1346 skb->dev = vxlan->dev;
1347 skb->pkt_type = PACKET_HOST;
1348 }
1349
1350 oiph = skb_network_header(skb);
1351 skb_reset_network_header(skb);
1352
1353 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1354 ++vxlan->dev->stats.rx_frame_errors;
1355 ++vxlan->dev->stats.rx_errors;
1356 goto drop;
1357 }
1358
1359 stats = this_cpu_ptr(vxlan->dev->tstats);
1360 u64_stats_update_begin(&stats->syncp);
1361 stats->rx_packets++;
1362 stats->rx_bytes += skb->len;
1363 u64_stats_update_end(&stats->syncp);
1364
1365 gro_cells_receive(&vxlan->gro_cells, skb);
1366 return 0;
1367
1368 drop:
1369 /* Consume bad packet */
1370 kfree_skb(skb);
1371 return 0;
1372 }
1373
1374 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1375 {
1376 struct vxlan_dev *vxlan = netdev_priv(dev);
1377 struct arphdr *parp;
1378 u8 *arpptr, *sha;
1379 __be32 sip, tip;
1380 struct neighbour *n;
1381
1382 if (dev->flags & IFF_NOARP)
1383 goto out;
1384
1385 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1386 dev->stats.tx_dropped++;
1387 goto out;
1388 }
1389 parp = arp_hdr(skb);
1390
1391 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1392 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1393 parp->ar_pro != htons(ETH_P_IP) ||
1394 parp->ar_op != htons(ARPOP_REQUEST) ||
1395 parp->ar_hln != dev->addr_len ||
1396 parp->ar_pln != 4)
1397 goto out;
1398 arpptr = (u8 *)parp + sizeof(struct arphdr);
1399 sha = arpptr;
1400 arpptr += dev->addr_len; /* sha */
1401 memcpy(&sip, arpptr, sizeof(sip));
1402 arpptr += sizeof(sip);
1403 arpptr += dev->addr_len; /* tha */
1404 memcpy(&tip, arpptr, sizeof(tip));
1405
1406 if (ipv4_is_loopback(tip) ||
1407 ipv4_is_multicast(tip))
1408 goto out;
1409
1410 n = neigh_lookup(&arp_tbl, &tip, dev);
1411
1412 if (n) {
1413 struct vxlan_fdb *f;
1414 struct sk_buff *reply;
1415
1416 if (!(n->nud_state & NUD_CONNECTED)) {
1417 neigh_release(n);
1418 goto out;
1419 }
1420
1421 f = vxlan_find_mac(vxlan, n->ha);
1422 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1423 /* bridge-local neighbor */
1424 neigh_release(n);
1425 goto out;
1426 }
1427
1428 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1429 n->ha, sha);
1430
1431 neigh_release(n);
1432
1433 if (reply == NULL)
1434 goto out;
1435
1436 skb_reset_mac_header(reply);
1437 __skb_pull(reply, skb_network_offset(reply));
1438 reply->ip_summed = CHECKSUM_UNNECESSARY;
1439 reply->pkt_type = PACKET_HOST;
1440
1441 if (netif_rx_ni(reply) == NET_RX_DROP)
1442 dev->stats.rx_dropped++;
1443 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1444 union vxlan_addr ipa = {
1445 .sin.sin_addr.s_addr = tip,
1446 .sin.sin_family = AF_INET,
1447 };
1448
1449 vxlan_ip_miss(dev, &ipa);
1450 }
1451 out:
1452 consume_skb(skb);
1453 return NETDEV_TX_OK;
1454 }
1455
1456 #if IS_ENABLED(CONFIG_IPV6)
1457 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1458 struct neighbour *n, bool isrouter)
1459 {
1460 struct net_device *dev = request->dev;
1461 struct sk_buff *reply;
1462 struct nd_msg *ns, *na;
1463 struct ipv6hdr *pip6;
1464 u8 *daddr;
1465 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1466 int ns_olen;
1467 int i, len;
1468
1469 if (dev == NULL)
1470 return NULL;
1471
1472 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1473 sizeof(*na) + na_olen + dev->needed_tailroom;
1474 reply = alloc_skb(len, GFP_ATOMIC);
1475 if (reply == NULL)
1476 return NULL;
1477
1478 reply->protocol = htons(ETH_P_IPV6);
1479 reply->dev = dev;
1480 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1481 skb_push(reply, sizeof(struct ethhdr));
1482 skb_reset_mac_header(reply);
1483
1484 ns = (struct nd_msg *)skb_transport_header(request);
1485
1486 daddr = eth_hdr(request)->h_source;
1487 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1488 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1489 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1490 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1491 break;
1492 }
1493 }
1494
1495 /* Ethernet header */
1496 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1497 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1498 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1499 reply->protocol = htons(ETH_P_IPV6);
1500
1501 skb_pull(reply, sizeof(struct ethhdr));
1502 skb_reset_network_header(reply);
1503 skb_put(reply, sizeof(struct ipv6hdr));
1504
1505 /* IPv6 header */
1506
1507 pip6 = ipv6_hdr(reply);
1508 memset(pip6, 0, sizeof(struct ipv6hdr));
1509 pip6->version = 6;
1510 pip6->priority = ipv6_hdr(request)->priority;
1511 pip6->nexthdr = IPPROTO_ICMPV6;
1512 pip6->hop_limit = 255;
1513 pip6->daddr = ipv6_hdr(request)->saddr;
1514 pip6->saddr = *(struct in6_addr *)n->primary_key;
1515
1516 skb_pull(reply, sizeof(struct ipv6hdr));
1517 skb_reset_transport_header(reply);
1518
1519 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1520
1521 /* Neighbor Advertisement */
1522 memset(na, 0, sizeof(*na)+na_olen);
1523 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1524 na->icmph.icmp6_router = isrouter;
1525 na->icmph.icmp6_override = 1;
1526 na->icmph.icmp6_solicited = 1;
1527 na->target = ns->target;
1528 ether_addr_copy(&na->opt[2], n->ha);
1529 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1530 na->opt[1] = na_olen >> 3;
1531
1532 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1533 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1534 csum_partial(na, sizeof(*na)+na_olen, 0));
1535
1536 pip6->payload_len = htons(sizeof(*na)+na_olen);
1537
1538 skb_push(reply, sizeof(struct ipv6hdr));
1539
1540 reply->ip_summed = CHECKSUM_UNNECESSARY;
1541
1542 return reply;
1543 }
1544
1545 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1546 {
1547 struct vxlan_dev *vxlan = netdev_priv(dev);
1548 struct nd_msg *msg;
1549 const struct ipv6hdr *iphdr;
1550 const struct in6_addr *saddr, *daddr;
1551 struct neighbour *n;
1552 struct inet6_dev *in6_dev;
1553
1554 in6_dev = __in6_dev_get(dev);
1555 if (!in6_dev)
1556 goto out;
1557
1558 iphdr = ipv6_hdr(skb);
1559 saddr = &iphdr->saddr;
1560 daddr = &iphdr->daddr;
1561
1562 msg = (struct nd_msg *)skb_transport_header(skb);
1563 if (msg->icmph.icmp6_code != 0 ||
1564 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1565 goto out;
1566
1567 if (ipv6_addr_loopback(daddr) ||
1568 ipv6_addr_is_multicast(&msg->target))
1569 goto out;
1570
1571 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1572
1573 if (n) {
1574 struct vxlan_fdb *f;
1575 struct sk_buff *reply;
1576
1577 if (!(n->nud_state & NUD_CONNECTED)) {
1578 neigh_release(n);
1579 goto out;
1580 }
1581
1582 f = vxlan_find_mac(vxlan, n->ha);
1583 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1584 /* bridge-local neighbor */
1585 neigh_release(n);
1586 goto out;
1587 }
1588
1589 reply = vxlan_na_create(skb, n,
1590 !!(f ? f->flags & NTF_ROUTER : 0));
1591
1592 neigh_release(n);
1593
1594 if (reply == NULL)
1595 goto out;
1596
1597 if (netif_rx_ni(reply) == NET_RX_DROP)
1598 dev->stats.rx_dropped++;
1599
1600 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1601 union vxlan_addr ipa = {
1602 .sin6.sin6_addr = msg->target,
1603 .sin6.sin6_family = AF_INET6,
1604 };
1605
1606 vxlan_ip_miss(dev, &ipa);
1607 }
1608
1609 out:
1610 consume_skb(skb);
1611 return NETDEV_TX_OK;
1612 }
1613 #endif
1614
1615 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1616 {
1617 struct vxlan_dev *vxlan = netdev_priv(dev);
1618 struct neighbour *n;
1619
1620 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1621 return false;
1622
1623 n = NULL;
1624 switch (ntohs(eth_hdr(skb)->h_proto)) {
1625 case ETH_P_IP:
1626 {
1627 struct iphdr *pip;
1628
1629 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1630 return false;
1631 pip = ip_hdr(skb);
1632 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1633 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1634 union vxlan_addr ipa = {
1635 .sin.sin_addr.s_addr = pip->daddr,
1636 .sin.sin_family = AF_INET,
1637 };
1638
1639 vxlan_ip_miss(dev, &ipa);
1640 return false;
1641 }
1642
1643 break;
1644 }
1645 #if IS_ENABLED(CONFIG_IPV6)
1646 case ETH_P_IPV6:
1647 {
1648 struct ipv6hdr *pip6;
1649
1650 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1651 return false;
1652 pip6 = ipv6_hdr(skb);
1653 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1654 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1655 union vxlan_addr ipa = {
1656 .sin6.sin6_addr = pip6->daddr,
1657 .sin6.sin6_family = AF_INET6,
1658 };
1659
1660 vxlan_ip_miss(dev, &ipa);
1661 return false;
1662 }
1663
1664 break;
1665 }
1666 #endif
1667 default:
1668 return false;
1669 }
1670
1671 if (n) {
1672 bool diff;
1673
1674 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1675 if (diff) {
1676 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1677 dev->addr_len);
1678 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1679 }
1680 neigh_release(n);
1681 return diff;
1682 }
1683
1684 return false;
1685 }
1686
1687 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1688 struct vxlan_metadata *md)
1689 {
1690 struct vxlanhdr_gbp *gbp;
1691
1692 if (!md->gbp)
1693 return;
1694
1695 gbp = (struct vxlanhdr_gbp *)vxh;
1696 vxh->vx_flags |= VXLAN_HF_GBP;
1697
1698 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1699 gbp->dont_learn = 1;
1700
1701 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1702 gbp->policy_applied = 1;
1703
1704 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1705 }
1706
1707 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1708 __be16 protocol)
1709 {
1710 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1711
1712 gpe->np_applied = 1;
1713
1714 switch (protocol) {
1715 case htons(ETH_P_IP):
1716 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1717 return 0;
1718 case htons(ETH_P_IPV6):
1719 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1720 return 0;
1721 case htons(ETH_P_TEB):
1722 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1723 return 0;
1724 }
1725 return -EPFNOSUPPORT;
1726 }
1727
1728 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1729 int iphdr_len, __be32 vni,
1730 struct vxlan_metadata *md, u32 vxflags,
1731 bool udp_sum)
1732 {
1733 struct vxlanhdr *vxh;
1734 int min_headroom;
1735 int err;
1736 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1737 __be16 inner_protocol = htons(ETH_P_TEB);
1738
1739 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1740 skb->ip_summed == CHECKSUM_PARTIAL) {
1741 int csum_start = skb_checksum_start_offset(skb);
1742
1743 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1744 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1745 (skb->csum_offset == offsetof(struct udphdr, check) ||
1746 skb->csum_offset == offsetof(struct tcphdr, check)))
1747 type |= SKB_GSO_TUNNEL_REMCSUM;
1748 }
1749
1750 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1751 + VXLAN_HLEN + iphdr_len
1752 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1753
1754 /* Need space for new headers (invalidates iph ptr) */
1755 err = skb_cow_head(skb, min_headroom);
1756 if (unlikely(err))
1757 goto out_free;
1758
1759 skb = vlan_hwaccel_push_inside(skb);
1760 if (WARN_ON(!skb))
1761 return -ENOMEM;
1762
1763 err = iptunnel_handle_offloads(skb, type);
1764 if (err)
1765 goto out_free;
1766
1767 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1768 vxh->vx_flags = VXLAN_HF_VNI;
1769 vxh->vx_vni = vxlan_vni_field(vni);
1770
1771 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1772 unsigned int start;
1773
1774 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1775 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1776 vxh->vx_flags |= VXLAN_HF_RCO;
1777
1778 if (!skb_is_gso(skb)) {
1779 skb->ip_summed = CHECKSUM_NONE;
1780 skb->encapsulation = 0;
1781 }
1782 }
1783
1784 if (vxflags & VXLAN_F_GBP)
1785 vxlan_build_gbp_hdr(vxh, vxflags, md);
1786 if (vxflags & VXLAN_F_GPE) {
1787 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1788 if (err < 0)
1789 goto out_free;
1790 inner_protocol = skb->protocol;
1791 }
1792
1793 skb_set_inner_protocol(skb, inner_protocol);
1794 return 0;
1795
1796 out_free:
1797 kfree_skb(skb);
1798 return err;
1799 }
1800
1801 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1802 struct sk_buff *skb, int oif, u8 tos,
1803 __be32 daddr, __be32 *saddr,
1804 struct dst_cache *dst_cache,
1805 const struct ip_tunnel_info *info)
1806 {
1807 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1808 struct rtable *rt = NULL;
1809 struct flowi4 fl4;
1810
1811 if (tos && !info)
1812 use_cache = false;
1813 if (use_cache) {
1814 rt = dst_cache_get_ip4(dst_cache, saddr);
1815 if (rt)
1816 return rt;
1817 }
1818
1819 memset(&fl4, 0, sizeof(fl4));
1820 fl4.flowi4_oif = oif;
1821 fl4.flowi4_tos = RT_TOS(tos);
1822 fl4.flowi4_mark = skb->mark;
1823 fl4.flowi4_proto = IPPROTO_UDP;
1824 fl4.daddr = daddr;
1825 fl4.saddr = *saddr;
1826
1827 rt = ip_route_output_key(vxlan->net, &fl4);
1828 if (!IS_ERR(rt)) {
1829 *saddr = fl4.saddr;
1830 if (use_cache)
1831 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1832 }
1833 return rt;
1834 }
1835
1836 #if IS_ENABLED(CONFIG_IPV6)
1837 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1838 struct sk_buff *skb, int oif, u8 tos,
1839 __be32 label,
1840 const struct in6_addr *daddr,
1841 struct in6_addr *saddr,
1842 struct dst_cache *dst_cache,
1843 const struct ip_tunnel_info *info)
1844 {
1845 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
1846 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1847 struct dst_entry *ndst;
1848 struct flowi6 fl6;
1849 int err;
1850
1851 if (!sock6)
1852 return ERR_PTR(-EIO);
1853
1854 if (tos && !info)
1855 use_cache = false;
1856 if (use_cache) {
1857 ndst = dst_cache_get_ip6(dst_cache, saddr);
1858 if (ndst)
1859 return ndst;
1860 }
1861
1862 memset(&fl6, 0, sizeof(fl6));
1863 fl6.flowi6_oif = oif;
1864 fl6.daddr = *daddr;
1865 fl6.saddr = *saddr;
1866 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1867 fl6.flowi6_mark = skb->mark;
1868 fl6.flowi6_proto = IPPROTO_UDP;
1869
1870 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1871 sock6->sock->sk,
1872 &ndst, &fl6);
1873 if (err < 0)
1874 return ERR_PTR(err);
1875
1876 *saddr = fl6.saddr;
1877 if (use_cache)
1878 dst_cache_set_ip6(dst_cache, ndst, saddr);
1879 return ndst;
1880 }
1881 #endif
1882
1883 /* Bypass encapsulation if the destination is local */
1884 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1885 struct vxlan_dev *dst_vxlan)
1886 {
1887 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1888 union vxlan_addr loopback;
1889 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1890 struct net_device *dev = skb->dev;
1891 int len = skb->len;
1892
1893 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1894 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1895 skb->pkt_type = PACKET_HOST;
1896 skb->encapsulation = 0;
1897 skb->dev = dst_vxlan->dev;
1898 __skb_pull(skb, skb_network_offset(skb));
1899
1900 if (remote_ip->sa.sa_family == AF_INET) {
1901 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1902 loopback.sa.sa_family = AF_INET;
1903 #if IS_ENABLED(CONFIG_IPV6)
1904 } else {
1905 loopback.sin6.sin6_addr = in6addr_loopback;
1906 loopback.sa.sa_family = AF_INET6;
1907 #endif
1908 }
1909
1910 if (dst_vxlan->flags & VXLAN_F_LEARN)
1911 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1912
1913 u64_stats_update_begin(&tx_stats->syncp);
1914 tx_stats->tx_packets++;
1915 tx_stats->tx_bytes += len;
1916 u64_stats_update_end(&tx_stats->syncp);
1917
1918 if (netif_rx(skb) == NET_RX_SUCCESS) {
1919 u64_stats_update_begin(&rx_stats->syncp);
1920 rx_stats->rx_packets++;
1921 rx_stats->rx_bytes += len;
1922 u64_stats_update_end(&rx_stats->syncp);
1923 } else {
1924 dev->stats.rx_dropped++;
1925 }
1926 }
1927
1928 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1929 struct vxlan_rdst *rdst, bool did_rsc)
1930 {
1931 struct dst_cache *dst_cache;
1932 struct ip_tunnel_info *info;
1933 struct vxlan_dev *vxlan = netdev_priv(dev);
1934 struct sock *sk;
1935 struct rtable *rt = NULL;
1936 const struct iphdr *old_iph;
1937 union vxlan_addr *dst;
1938 union vxlan_addr remote_ip, local_ip;
1939 union vxlan_addr *src;
1940 struct vxlan_metadata _md;
1941 struct vxlan_metadata *md = &_md;
1942 __be16 src_port = 0, dst_port;
1943 __be32 vni, label;
1944 __be16 df = 0;
1945 __u8 tos, ttl;
1946 int err;
1947 u32 flags = vxlan->flags;
1948 bool udp_sum = false;
1949 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1950
1951 info = skb_tunnel_info(skb);
1952
1953 if (rdst) {
1954 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1955 vni = rdst->remote_vni;
1956 dst = &rdst->remote_ip;
1957 src = &vxlan->cfg.saddr;
1958 dst_cache = &rdst->dst_cache;
1959 } else {
1960 if (!info) {
1961 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1962 dev->name);
1963 goto drop;
1964 }
1965 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1966 vni = tunnel_id_to_key32(info->key.tun_id);
1967 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1968 if (remote_ip.sa.sa_family == AF_INET) {
1969 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1970 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
1971 } else {
1972 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1973 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
1974 }
1975 dst = &remote_ip;
1976 src = &local_ip;
1977 dst_cache = &info->dst_cache;
1978 }
1979
1980 if (vxlan_addr_any(dst)) {
1981 if (did_rsc) {
1982 /* short-circuited back to local bridge */
1983 vxlan_encap_bypass(skb, vxlan, vxlan);
1984 return;
1985 }
1986 goto drop;
1987 }
1988
1989 old_iph = ip_hdr(skb);
1990
1991 ttl = vxlan->cfg.ttl;
1992 if (!ttl && vxlan_addr_multicast(dst))
1993 ttl = 1;
1994
1995 tos = vxlan->cfg.tos;
1996 if (tos == 1)
1997 tos = ip_tunnel_get_dsfield(old_iph, skb);
1998
1999 label = vxlan->cfg.label;
2000 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2001 vxlan->cfg.port_max, true);
2002
2003 if (info) {
2004 ttl = info->key.ttl;
2005 tos = info->key.tos;
2006 label = info->key.label;
2007 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2008
2009 if (info->options_len)
2010 md = ip_tunnel_info_opts(info);
2011 } else {
2012 md->gbp = skb->mark;
2013 }
2014
2015 if (dst->sa.sa_family == AF_INET) {
2016 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2017
2018 if (!sock4)
2019 goto drop;
2020 sk = sock4->sock->sk;
2021
2022 rt = vxlan_get_route(vxlan, skb,
2023 rdst ? rdst->remote_ifindex : 0, tos,
2024 dst->sin.sin_addr.s_addr,
2025 &src->sin.sin_addr.s_addr,
2026 dst_cache, info);
2027 if (IS_ERR(rt)) {
2028 netdev_dbg(dev, "no route to %pI4\n",
2029 &dst->sin.sin_addr.s_addr);
2030 dev->stats.tx_carrier_errors++;
2031 goto tx_error;
2032 }
2033
2034 if (rt->dst.dev == dev) {
2035 netdev_dbg(dev, "circular route to %pI4\n",
2036 &dst->sin.sin_addr.s_addr);
2037 dev->stats.collisions++;
2038 goto rt_tx_error;
2039 }
2040
2041 /* Bypass encapsulation if the destination is local */
2042 if (!info && rt->rt_flags & RTCF_LOCAL &&
2043 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2044 struct vxlan_dev *dst_vxlan;
2045
2046 ip_rt_put(rt);
2047 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2048 dst->sa.sa_family, dst_port,
2049 vxlan->flags);
2050 if (!dst_vxlan)
2051 goto tx_error;
2052 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2053 return;
2054 }
2055
2056 if (!info)
2057 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2058 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2059 df = htons(IP_DF);
2060
2061 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2062 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2063 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2064 vni, md, flags, udp_sum);
2065 if (err < 0)
2066 goto xmit_tx_error;
2067
2068 udp_tunnel_xmit_skb(rt, sk, skb, src->sin.sin_addr.s_addr,
2069 dst->sin.sin_addr.s_addr, tos, ttl, df,
2070 src_port, dst_port, xnet, !udp_sum);
2071 #if IS_ENABLED(CONFIG_IPV6)
2072 } else {
2073 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2074 struct dst_entry *ndst;
2075 u32 rt6i_flags;
2076
2077 if (!sock6)
2078 goto drop;
2079 sk = sock6->sock->sk;
2080
2081 ndst = vxlan6_get_route(vxlan, skb,
2082 rdst ? rdst->remote_ifindex : 0, tos,
2083 label, &dst->sin6.sin6_addr,
2084 &src->sin6.sin6_addr,
2085 dst_cache, info);
2086 if (IS_ERR(ndst)) {
2087 netdev_dbg(dev, "no route to %pI6\n",
2088 &dst->sin6.sin6_addr);
2089 dev->stats.tx_carrier_errors++;
2090 goto tx_error;
2091 }
2092
2093 if (ndst->dev == dev) {
2094 netdev_dbg(dev, "circular route to %pI6\n",
2095 &dst->sin6.sin6_addr);
2096 dst_release(ndst);
2097 dev->stats.collisions++;
2098 goto tx_error;
2099 }
2100
2101 /* Bypass encapsulation if the destination is local */
2102 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2103 if (!info && rt6i_flags & RTF_LOCAL &&
2104 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2105 struct vxlan_dev *dst_vxlan;
2106
2107 dst_release(ndst);
2108 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2109 dst->sa.sa_family, dst_port,
2110 vxlan->flags);
2111 if (!dst_vxlan)
2112 goto tx_error;
2113 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2114 return;
2115 }
2116
2117 if (!info)
2118 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2119
2120 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2121 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2122 skb_scrub_packet(skb, xnet);
2123 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2124 vni, md, flags, udp_sum);
2125 if (err < 0) {
2126 dst_release(ndst);
2127 dev->stats.tx_errors++;
2128 return;
2129 }
2130 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2131 &src->sin6.sin6_addr,
2132 &dst->sin6.sin6_addr, tos, ttl,
2133 label, src_port, dst_port, !udp_sum);
2134 #endif
2135 }
2136
2137 return;
2138
2139 drop:
2140 dev->stats.tx_dropped++;
2141 goto tx_free;
2142
2143 xmit_tx_error:
2144 /* skb is already freed. */
2145 skb = NULL;
2146 rt_tx_error:
2147 ip_rt_put(rt);
2148 tx_error:
2149 dev->stats.tx_errors++;
2150 tx_free:
2151 dev_kfree_skb(skb);
2152 }
2153
2154 /* Transmit local packets over Vxlan
2155 *
2156 * Outer IP header inherits ECN and DF from inner header.
2157 * Outer UDP destination is the VXLAN assigned port.
2158 * source port is based on hash of flow
2159 */
2160 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2161 {
2162 struct vxlan_dev *vxlan = netdev_priv(dev);
2163 const struct ip_tunnel_info *info;
2164 struct ethhdr *eth;
2165 bool did_rsc = false;
2166 struct vxlan_rdst *rdst, *fdst = NULL;
2167 struct vxlan_fdb *f;
2168
2169 info = skb_tunnel_info(skb);
2170
2171 skb_reset_mac_header(skb);
2172
2173 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2174 if (info && info->mode & IP_TUNNEL_INFO_TX)
2175 vxlan_xmit_one(skb, dev, NULL, false);
2176 else
2177 kfree_skb(skb);
2178 return NETDEV_TX_OK;
2179 }
2180
2181 if (vxlan->flags & VXLAN_F_PROXY) {
2182 eth = eth_hdr(skb);
2183 if (ntohs(eth->h_proto) == ETH_P_ARP)
2184 return arp_reduce(dev, skb);
2185 #if IS_ENABLED(CONFIG_IPV6)
2186 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2187 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2188 + sizeof(struct nd_msg)) &&
2189 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2190 struct nd_msg *msg;
2191
2192 msg = (struct nd_msg *)skb_transport_header(skb);
2193 if (msg->icmph.icmp6_code == 0 &&
2194 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2195 return neigh_reduce(dev, skb);
2196 }
2197 #endif
2198 }
2199
2200 eth = eth_hdr(skb);
2201 f = vxlan_find_mac(vxlan, eth->h_dest);
2202 did_rsc = false;
2203
2204 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2205 (ntohs(eth->h_proto) == ETH_P_IP ||
2206 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2207 did_rsc = route_shortcircuit(dev, skb);
2208 if (did_rsc)
2209 f = vxlan_find_mac(vxlan, eth->h_dest);
2210 }
2211
2212 if (f == NULL) {
2213 f = vxlan_find_mac(vxlan, all_zeros_mac);
2214 if (f == NULL) {
2215 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2216 !is_multicast_ether_addr(eth->h_dest))
2217 vxlan_fdb_miss(vxlan, eth->h_dest);
2218
2219 dev->stats.tx_dropped++;
2220 kfree_skb(skb);
2221 return NETDEV_TX_OK;
2222 }
2223 }
2224
2225 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2226 struct sk_buff *skb1;
2227
2228 if (!fdst) {
2229 fdst = rdst;
2230 continue;
2231 }
2232 skb1 = skb_clone(skb, GFP_ATOMIC);
2233 if (skb1)
2234 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2235 }
2236
2237 if (fdst)
2238 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2239 else
2240 kfree_skb(skb);
2241 return NETDEV_TX_OK;
2242 }
2243
2244 /* Walk the forwarding table and purge stale entries */
2245 static void vxlan_cleanup(unsigned long arg)
2246 {
2247 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2248 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2249 unsigned int h;
2250
2251 if (!netif_running(vxlan->dev))
2252 return;
2253
2254 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2255 struct hlist_node *p, *n;
2256
2257 spin_lock_bh(&vxlan->hash_lock);
2258 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2259 struct vxlan_fdb *f
2260 = container_of(p, struct vxlan_fdb, hlist);
2261 unsigned long timeout;
2262
2263 if (f->state & NUD_PERMANENT)
2264 continue;
2265
2266 timeout = f->used + vxlan->cfg.age_interval * HZ;
2267 if (time_before_eq(timeout, jiffies)) {
2268 netdev_dbg(vxlan->dev,
2269 "garbage collect %pM\n",
2270 f->eth_addr);
2271 f->state = NUD_STALE;
2272 vxlan_fdb_destroy(vxlan, f);
2273 } else if (time_before(timeout, next_timer))
2274 next_timer = timeout;
2275 }
2276 spin_unlock_bh(&vxlan->hash_lock);
2277 }
2278
2279 mod_timer(&vxlan->age_timer, next_timer);
2280 }
2281
2282 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2283 {
2284 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2285 __be32 vni = vxlan->default_dst.remote_vni;
2286
2287 spin_lock(&vn->sock_lock);
2288 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2289 spin_unlock(&vn->sock_lock);
2290 }
2291
2292 /* Setup stats when device is created */
2293 static int vxlan_init(struct net_device *dev)
2294 {
2295 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2296 if (!dev->tstats)
2297 return -ENOMEM;
2298
2299 return 0;
2300 }
2301
2302 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2303 {
2304 struct vxlan_fdb *f;
2305
2306 spin_lock_bh(&vxlan->hash_lock);
2307 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2308 if (f)
2309 vxlan_fdb_destroy(vxlan, f);
2310 spin_unlock_bh(&vxlan->hash_lock);
2311 }
2312
2313 static void vxlan_uninit(struct net_device *dev)
2314 {
2315 struct vxlan_dev *vxlan = netdev_priv(dev);
2316
2317 vxlan_fdb_delete_default(vxlan);
2318
2319 free_percpu(dev->tstats);
2320 }
2321
2322 /* Start ageing timer and join group when device is brought up */
2323 static int vxlan_open(struct net_device *dev)
2324 {
2325 struct vxlan_dev *vxlan = netdev_priv(dev);
2326 int ret;
2327
2328 ret = vxlan_sock_add(vxlan);
2329 if (ret < 0)
2330 return ret;
2331
2332 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2333 ret = vxlan_igmp_join(vxlan);
2334 if (ret == -EADDRINUSE)
2335 ret = 0;
2336 if (ret) {
2337 vxlan_sock_release(vxlan);
2338 return ret;
2339 }
2340 }
2341
2342 if (vxlan->cfg.age_interval)
2343 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2344
2345 return ret;
2346 }
2347
2348 /* Purge the forwarding table */
2349 static void vxlan_flush(struct vxlan_dev *vxlan)
2350 {
2351 unsigned int h;
2352
2353 spin_lock_bh(&vxlan->hash_lock);
2354 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2355 struct hlist_node *p, *n;
2356 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2357 struct vxlan_fdb *f
2358 = container_of(p, struct vxlan_fdb, hlist);
2359 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2360 if (!is_zero_ether_addr(f->eth_addr))
2361 vxlan_fdb_destroy(vxlan, f);
2362 }
2363 }
2364 spin_unlock_bh(&vxlan->hash_lock);
2365 }
2366
2367 /* Cleanup timer and forwarding table on shutdown */
2368 static int vxlan_stop(struct net_device *dev)
2369 {
2370 struct vxlan_dev *vxlan = netdev_priv(dev);
2371 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2372 int ret = 0;
2373
2374 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2375 !vxlan_group_used(vn, vxlan))
2376 ret = vxlan_igmp_leave(vxlan);
2377
2378 del_timer_sync(&vxlan->age_timer);
2379
2380 vxlan_flush(vxlan);
2381 vxlan_sock_release(vxlan);
2382
2383 return ret;
2384 }
2385
2386 /* Stub, nothing needs to be done. */
2387 static void vxlan_set_multicast_list(struct net_device *dev)
2388 {
2389 }
2390
2391 static int __vxlan_change_mtu(struct net_device *dev,
2392 struct net_device *lowerdev,
2393 struct vxlan_rdst *dst, int new_mtu, bool strict)
2394 {
2395 int max_mtu = IP_MAX_MTU;
2396
2397 if (lowerdev)
2398 max_mtu = lowerdev->mtu;
2399
2400 if (dst->remote_ip.sa.sa_family == AF_INET6)
2401 max_mtu -= VXLAN6_HEADROOM;
2402 else
2403 max_mtu -= VXLAN_HEADROOM;
2404
2405 if (new_mtu < 68)
2406 return -EINVAL;
2407
2408 if (new_mtu > max_mtu) {
2409 if (strict)
2410 return -EINVAL;
2411
2412 new_mtu = max_mtu;
2413 }
2414
2415 dev->mtu = new_mtu;
2416 return 0;
2417 }
2418
2419 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2420 {
2421 struct vxlan_dev *vxlan = netdev_priv(dev);
2422 struct vxlan_rdst *dst = &vxlan->default_dst;
2423 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2424 dst->remote_ifindex);
2425 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2426 }
2427
2428 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2429 {
2430 struct vxlan_dev *vxlan = netdev_priv(dev);
2431 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2432 __be16 sport, dport;
2433
2434 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2435 vxlan->cfg.port_max, true);
2436 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2437
2438 if (ip_tunnel_info_af(info) == AF_INET) {
2439 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2440 struct rtable *rt;
2441
2442 if (!sock4)
2443 return -EINVAL;
2444 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2445 info->key.u.ipv4.dst,
2446 &info->key.u.ipv4.src, NULL, info);
2447 if (IS_ERR(rt))
2448 return PTR_ERR(rt);
2449 ip_rt_put(rt);
2450 } else {
2451 #if IS_ENABLED(CONFIG_IPV6)
2452 struct dst_entry *ndst;
2453
2454 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2455 info->key.label, &info->key.u.ipv6.dst,
2456 &info->key.u.ipv6.src, NULL, info);
2457 if (IS_ERR(ndst))
2458 return PTR_ERR(ndst);
2459 dst_release(ndst);
2460 #else /* !CONFIG_IPV6 */
2461 return -EPFNOSUPPORT;
2462 #endif
2463 }
2464 info->key.tp_src = sport;
2465 info->key.tp_dst = dport;
2466 return 0;
2467 }
2468
2469 static const struct net_device_ops vxlan_netdev_ether_ops = {
2470 .ndo_init = vxlan_init,
2471 .ndo_uninit = vxlan_uninit,
2472 .ndo_open = vxlan_open,
2473 .ndo_stop = vxlan_stop,
2474 .ndo_start_xmit = vxlan_xmit,
2475 .ndo_get_stats64 = ip_tunnel_get_stats64,
2476 .ndo_set_rx_mode = vxlan_set_multicast_list,
2477 .ndo_change_mtu = vxlan_change_mtu,
2478 .ndo_validate_addr = eth_validate_addr,
2479 .ndo_set_mac_address = eth_mac_addr,
2480 .ndo_fdb_add = vxlan_fdb_add,
2481 .ndo_fdb_del = vxlan_fdb_delete,
2482 .ndo_fdb_dump = vxlan_fdb_dump,
2483 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2484 };
2485
2486 static const struct net_device_ops vxlan_netdev_raw_ops = {
2487 .ndo_init = vxlan_init,
2488 .ndo_uninit = vxlan_uninit,
2489 .ndo_open = vxlan_open,
2490 .ndo_stop = vxlan_stop,
2491 .ndo_start_xmit = vxlan_xmit,
2492 .ndo_get_stats64 = ip_tunnel_get_stats64,
2493 .ndo_change_mtu = vxlan_change_mtu,
2494 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2495 };
2496
2497 /* Info for udev, that this is a virtual tunnel endpoint */
2498 static struct device_type vxlan_type = {
2499 .name = "vxlan",
2500 };
2501
2502 /* Calls the ndo_udp_tunnel_add of the caller in order to
2503 * supply the listening VXLAN udp ports. Callers are expected
2504 * to implement the ndo_udp_tunnel_add.
2505 */
2506 static void vxlan_push_rx_ports(struct net_device *dev)
2507 {
2508 struct vxlan_sock *vs;
2509 struct net *net = dev_net(dev);
2510 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2511 unsigned int i;
2512
2513 spin_lock(&vn->sock_lock);
2514 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2515 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2516 udp_tunnel_push_rx_port(dev, vs->sock,
2517 (vs->flags & VXLAN_F_GPE) ?
2518 UDP_TUNNEL_TYPE_VXLAN_GPE :
2519 UDP_TUNNEL_TYPE_VXLAN);
2520 }
2521 spin_unlock(&vn->sock_lock);
2522 }
2523
2524 /* Initialize the device structure. */
2525 static void vxlan_setup(struct net_device *dev)
2526 {
2527 struct vxlan_dev *vxlan = netdev_priv(dev);
2528 unsigned int h;
2529
2530 eth_hw_addr_random(dev);
2531 ether_setup(dev);
2532
2533 dev->destructor = free_netdev;
2534 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2535
2536 dev->features |= NETIF_F_LLTX;
2537 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2538 dev->features |= NETIF_F_RXCSUM;
2539 dev->features |= NETIF_F_GSO_SOFTWARE;
2540
2541 dev->vlan_features = dev->features;
2542 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2543 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2544 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2545 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2546 netif_keep_dst(dev);
2547 dev->priv_flags |= IFF_NO_QUEUE;
2548
2549 INIT_LIST_HEAD(&vxlan->next);
2550 spin_lock_init(&vxlan->hash_lock);
2551
2552 init_timer_deferrable(&vxlan->age_timer);
2553 vxlan->age_timer.function = vxlan_cleanup;
2554 vxlan->age_timer.data = (unsigned long) vxlan;
2555
2556 vxlan->cfg.dst_port = htons(vxlan_port);
2557
2558 vxlan->dev = dev;
2559
2560 gro_cells_init(&vxlan->gro_cells, dev);
2561
2562 for (h = 0; h < FDB_HASH_SIZE; ++h)
2563 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2564 }
2565
2566 static void vxlan_ether_setup(struct net_device *dev)
2567 {
2568 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2569 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2570 dev->netdev_ops = &vxlan_netdev_ether_ops;
2571 }
2572
2573 static void vxlan_raw_setup(struct net_device *dev)
2574 {
2575 dev->header_ops = NULL;
2576 dev->type = ARPHRD_NONE;
2577 dev->hard_header_len = 0;
2578 dev->addr_len = 0;
2579 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2580 dev->netdev_ops = &vxlan_netdev_raw_ops;
2581 }
2582
2583 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2584 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2585 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2586 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2587 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2588 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2589 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2590 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2591 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2592 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2593 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2594 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2595 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2596 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2597 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2598 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2599 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2600 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2601 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2602 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2603 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2604 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2605 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2606 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2607 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2608 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2609 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2610 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2611 };
2612
2613 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2614 {
2615 if (tb[IFLA_ADDRESS]) {
2616 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2617 pr_debug("invalid link address (not ethernet)\n");
2618 return -EINVAL;
2619 }
2620
2621 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2622 pr_debug("invalid all zero ethernet address\n");
2623 return -EADDRNOTAVAIL;
2624 }
2625 }
2626
2627 if (!data)
2628 return -EINVAL;
2629
2630 if (data[IFLA_VXLAN_ID]) {
2631 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2632 if (id >= VXLAN_VID_MASK)
2633 return -ERANGE;
2634 }
2635
2636 if (data[IFLA_VXLAN_PORT_RANGE]) {
2637 const struct ifla_vxlan_port_range *p
2638 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2639
2640 if (ntohs(p->high) < ntohs(p->low)) {
2641 pr_debug("port range %u .. %u not valid\n",
2642 ntohs(p->low), ntohs(p->high));
2643 return -EINVAL;
2644 }
2645 }
2646
2647 return 0;
2648 }
2649
2650 static void vxlan_get_drvinfo(struct net_device *netdev,
2651 struct ethtool_drvinfo *drvinfo)
2652 {
2653 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2654 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2655 }
2656
2657 static const struct ethtool_ops vxlan_ethtool_ops = {
2658 .get_drvinfo = vxlan_get_drvinfo,
2659 .get_link = ethtool_op_get_link,
2660 };
2661
2662 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2663 __be16 port, u32 flags)
2664 {
2665 struct socket *sock;
2666 struct udp_port_cfg udp_conf;
2667 int err;
2668
2669 memset(&udp_conf, 0, sizeof(udp_conf));
2670
2671 if (ipv6) {
2672 udp_conf.family = AF_INET6;
2673 udp_conf.use_udp6_rx_checksums =
2674 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2675 udp_conf.ipv6_v6only = 1;
2676 } else {
2677 udp_conf.family = AF_INET;
2678 }
2679
2680 udp_conf.local_udp_port = port;
2681
2682 /* Open UDP socket */
2683 err = udp_sock_create(net, &udp_conf, &sock);
2684 if (err < 0)
2685 return ERR_PTR(err);
2686
2687 return sock;
2688 }
2689
2690 /* Create new listen socket if needed */
2691 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2692 __be16 port, u32 flags)
2693 {
2694 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2695 struct vxlan_sock *vs;
2696 struct socket *sock;
2697 unsigned int h;
2698 struct udp_tunnel_sock_cfg tunnel_cfg;
2699
2700 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2701 if (!vs)
2702 return ERR_PTR(-ENOMEM);
2703
2704 for (h = 0; h < VNI_HASH_SIZE; ++h)
2705 INIT_HLIST_HEAD(&vs->vni_list[h]);
2706
2707 sock = vxlan_create_sock(net, ipv6, port, flags);
2708 if (IS_ERR(sock)) {
2709 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2710 PTR_ERR(sock));
2711 kfree(vs);
2712 return ERR_CAST(sock);
2713 }
2714
2715 vs->sock = sock;
2716 atomic_set(&vs->refcnt, 1);
2717 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2718
2719 spin_lock(&vn->sock_lock);
2720 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2721 udp_tunnel_notify_add_rx_port(sock,
2722 (vs->flags & VXLAN_F_GPE) ?
2723 UDP_TUNNEL_TYPE_VXLAN_GPE :
2724 UDP_TUNNEL_TYPE_VXLAN);
2725 spin_unlock(&vn->sock_lock);
2726
2727 /* Mark socket as an encapsulation socket. */
2728 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2729 tunnel_cfg.sk_user_data = vs;
2730 tunnel_cfg.encap_type = 1;
2731 tunnel_cfg.encap_rcv = vxlan_rcv;
2732 tunnel_cfg.encap_destroy = NULL;
2733 tunnel_cfg.gro_receive = vxlan_gro_receive;
2734 tunnel_cfg.gro_complete = vxlan_gro_complete;
2735
2736 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2737
2738 return vs;
2739 }
2740
2741 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2742 {
2743 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2744 struct vxlan_sock *vs = NULL;
2745
2746 if (!vxlan->cfg.no_share) {
2747 spin_lock(&vn->sock_lock);
2748 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2749 vxlan->cfg.dst_port, vxlan->flags);
2750 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2751 spin_unlock(&vn->sock_lock);
2752 return -EBUSY;
2753 }
2754 spin_unlock(&vn->sock_lock);
2755 }
2756 if (!vs)
2757 vs = vxlan_socket_create(vxlan->net, ipv6,
2758 vxlan->cfg.dst_port, vxlan->flags);
2759 if (IS_ERR(vs))
2760 return PTR_ERR(vs);
2761 #if IS_ENABLED(CONFIG_IPV6)
2762 if (ipv6)
2763 rcu_assign_pointer(vxlan->vn6_sock, vs);
2764 else
2765 #endif
2766 rcu_assign_pointer(vxlan->vn4_sock, vs);
2767 vxlan_vs_add_dev(vs, vxlan);
2768 return 0;
2769 }
2770
2771 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2772 {
2773 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2774 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2775 int ret = 0;
2776
2777 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2778 #if IS_ENABLED(CONFIG_IPV6)
2779 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2780 if (ipv6 || metadata)
2781 ret = __vxlan_sock_add(vxlan, true);
2782 #endif
2783 if (!ret && (!ipv6 || metadata))
2784 ret = __vxlan_sock_add(vxlan, false);
2785 if (ret < 0)
2786 vxlan_sock_release(vxlan);
2787 return ret;
2788 }
2789
2790 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2791 struct vxlan_config *conf)
2792 {
2793 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2794 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2795 struct vxlan_rdst *dst = &vxlan->default_dst;
2796 unsigned short needed_headroom = ETH_HLEN;
2797 int err;
2798 bool use_ipv6 = false;
2799 __be16 default_port = vxlan->cfg.dst_port;
2800 struct net_device *lowerdev = NULL;
2801
2802 if (conf->flags & VXLAN_F_GPE) {
2803 /* For now, allow GPE only together with COLLECT_METADATA.
2804 * This can be relaxed later; in such case, the other side
2805 * of the PtP link will have to be provided.
2806 */
2807 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2808 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2809 pr_info("unsupported combination of extensions\n");
2810 return -EINVAL;
2811 }
2812
2813 vxlan_raw_setup(dev);
2814 } else {
2815 vxlan_ether_setup(dev);
2816 }
2817
2818 vxlan->net = src_net;
2819
2820 dst->remote_vni = conf->vni;
2821
2822 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2823
2824 /* Unless IPv6 is explicitly requested, assume IPv4 */
2825 if (!dst->remote_ip.sa.sa_family)
2826 dst->remote_ip.sa.sa_family = AF_INET;
2827
2828 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2829 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2830 if (!IS_ENABLED(CONFIG_IPV6))
2831 return -EPFNOSUPPORT;
2832 use_ipv6 = true;
2833 vxlan->flags |= VXLAN_F_IPV6;
2834 }
2835
2836 if (conf->label && !use_ipv6) {
2837 pr_info("label only supported in use with IPv6\n");
2838 return -EINVAL;
2839 }
2840
2841 if (conf->remote_ifindex) {
2842 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2843 dst->remote_ifindex = conf->remote_ifindex;
2844
2845 if (!lowerdev) {
2846 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2847 return -ENODEV;
2848 }
2849
2850 #if IS_ENABLED(CONFIG_IPV6)
2851 if (use_ipv6) {
2852 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2853 if (idev && idev->cnf.disable_ipv6) {
2854 pr_info("IPv6 is disabled via sysctl\n");
2855 return -EPERM;
2856 }
2857 }
2858 #endif
2859
2860 if (!conf->mtu)
2861 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2862
2863 needed_headroom = lowerdev->hard_header_len;
2864 } else if (vxlan_addr_multicast(&dst->remote_ip)) {
2865 pr_info("multicast destination requires interface to be specified\n");
2866 return -EINVAL;
2867 }
2868
2869 if (conf->mtu) {
2870 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2871 if (err)
2872 return err;
2873 }
2874
2875 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2876 needed_headroom += VXLAN6_HEADROOM;
2877 else
2878 needed_headroom += VXLAN_HEADROOM;
2879 dev->needed_headroom = needed_headroom;
2880
2881 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2882 if (!vxlan->cfg.dst_port) {
2883 if (conf->flags & VXLAN_F_GPE)
2884 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2885 else
2886 vxlan->cfg.dst_port = default_port;
2887 }
2888 vxlan->flags |= conf->flags;
2889
2890 if (!vxlan->cfg.age_interval)
2891 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2892
2893 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2894 if (tmp->cfg.vni == conf->vni &&
2895 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2896 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2897 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2898 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2899 (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
2900 pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
2901 return -EEXIST;
2902 }
2903 }
2904
2905 dev->ethtool_ops = &vxlan_ethtool_ops;
2906
2907 /* create an fdb entry for a valid default destination */
2908 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2909 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2910 &vxlan->default_dst.remote_ip,
2911 NUD_REACHABLE|NUD_PERMANENT,
2912 NLM_F_EXCL|NLM_F_CREATE,
2913 vxlan->cfg.dst_port,
2914 vxlan->default_dst.remote_vni,
2915 vxlan->default_dst.remote_ifindex,
2916 NTF_SELF);
2917 if (err)
2918 return err;
2919 }
2920
2921 err = register_netdevice(dev);
2922 if (err) {
2923 vxlan_fdb_delete_default(vxlan);
2924 return err;
2925 }
2926
2927 list_add(&vxlan->next, &vn->vxlan_list);
2928
2929 return 0;
2930 }
2931
2932 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2933 struct nlattr *tb[], struct nlattr *data[])
2934 {
2935 struct vxlan_config conf;
2936
2937 memset(&conf, 0, sizeof(conf));
2938
2939 if (data[IFLA_VXLAN_ID])
2940 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2941
2942 if (data[IFLA_VXLAN_GROUP]) {
2943 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2944 } else if (data[IFLA_VXLAN_GROUP6]) {
2945 if (!IS_ENABLED(CONFIG_IPV6))
2946 return -EPFNOSUPPORT;
2947
2948 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2949 conf.remote_ip.sa.sa_family = AF_INET6;
2950 }
2951
2952 if (data[IFLA_VXLAN_LOCAL]) {
2953 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2954 conf.saddr.sa.sa_family = AF_INET;
2955 } else if (data[IFLA_VXLAN_LOCAL6]) {
2956 if (!IS_ENABLED(CONFIG_IPV6))
2957 return -EPFNOSUPPORT;
2958
2959 /* TODO: respect scope id */
2960 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2961 conf.saddr.sa.sa_family = AF_INET6;
2962 }
2963
2964 if (data[IFLA_VXLAN_LINK])
2965 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2966
2967 if (data[IFLA_VXLAN_TOS])
2968 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2969
2970 if (data[IFLA_VXLAN_TTL])
2971 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2972
2973 if (data[IFLA_VXLAN_LABEL])
2974 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2975 IPV6_FLOWLABEL_MASK;
2976
2977 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2978 conf.flags |= VXLAN_F_LEARN;
2979
2980 if (data[IFLA_VXLAN_AGEING])
2981 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2982
2983 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2984 conf.flags |= VXLAN_F_PROXY;
2985
2986 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2987 conf.flags |= VXLAN_F_RSC;
2988
2989 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2990 conf.flags |= VXLAN_F_L2MISS;
2991
2992 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2993 conf.flags |= VXLAN_F_L3MISS;
2994
2995 if (data[IFLA_VXLAN_LIMIT])
2996 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2997
2998 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2999 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3000 conf.flags |= VXLAN_F_COLLECT_METADATA;
3001
3002 if (data[IFLA_VXLAN_PORT_RANGE]) {
3003 const struct ifla_vxlan_port_range *p
3004 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3005 conf.port_min = ntohs(p->low);
3006 conf.port_max = ntohs(p->high);
3007 }
3008
3009 if (data[IFLA_VXLAN_PORT])
3010 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3011
3012 if (data[IFLA_VXLAN_UDP_CSUM] &&
3013 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3014 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3015
3016 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3017 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3018 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3019
3020 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3021 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3022 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3023
3024 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3025 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3026 conf.flags |= VXLAN_F_REMCSUM_TX;
3027
3028 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3029 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3030 conf.flags |= VXLAN_F_REMCSUM_RX;
3031
3032 if (data[IFLA_VXLAN_GBP])
3033 conf.flags |= VXLAN_F_GBP;
3034
3035 if (data[IFLA_VXLAN_GPE])
3036 conf.flags |= VXLAN_F_GPE;
3037
3038 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3039 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3040
3041 if (tb[IFLA_MTU])
3042 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3043
3044 return vxlan_dev_configure(src_net, dev, &conf);
3045 }
3046
3047 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3048 {
3049 struct vxlan_dev *vxlan = netdev_priv(dev);
3050 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3051
3052 spin_lock(&vn->sock_lock);
3053 if (!hlist_unhashed(&vxlan->hlist))
3054 hlist_del_rcu(&vxlan->hlist);
3055 spin_unlock(&vn->sock_lock);
3056
3057 gro_cells_destroy(&vxlan->gro_cells);
3058 list_del(&vxlan->next);
3059 unregister_netdevice_queue(dev, head);
3060 }
3061
3062 static size_t vxlan_get_size(const struct net_device *dev)
3063 {
3064
3065 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3066 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3067 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3068 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3069 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3070 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3071 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3072 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3073 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3074 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3075 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3076 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3077 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3078 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3079 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3080 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3081 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3082 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3083 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3084 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3085 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3086 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3087 0;
3088 }
3089
3090 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3091 {
3092 const struct vxlan_dev *vxlan = netdev_priv(dev);
3093 const struct vxlan_rdst *dst = &vxlan->default_dst;
3094 struct ifla_vxlan_port_range ports = {
3095 .low = htons(vxlan->cfg.port_min),
3096 .high = htons(vxlan->cfg.port_max),
3097 };
3098
3099 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3100 goto nla_put_failure;
3101
3102 if (!vxlan_addr_any(&dst->remote_ip)) {
3103 if (dst->remote_ip.sa.sa_family == AF_INET) {
3104 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3105 dst->remote_ip.sin.sin_addr.s_addr))
3106 goto nla_put_failure;
3107 #if IS_ENABLED(CONFIG_IPV6)
3108 } else {
3109 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3110 &dst->remote_ip.sin6.sin6_addr))
3111 goto nla_put_failure;
3112 #endif
3113 }
3114 }
3115
3116 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3117 goto nla_put_failure;
3118
3119 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3120 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3121 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3122 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3123 goto nla_put_failure;
3124 #if IS_ENABLED(CONFIG_IPV6)
3125 } else {
3126 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3127 &vxlan->cfg.saddr.sin6.sin6_addr))
3128 goto nla_put_failure;
3129 #endif
3130 }
3131 }
3132
3133 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3134 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3135 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3136 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3137 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3138 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3139 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3140 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3141 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3142 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3143 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3144 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3145 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3146 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3147 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3148 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3149 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3150 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3151 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3152 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3153 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3154 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3155 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3156 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3157 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3158 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3159 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3160 goto nla_put_failure;
3161
3162 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3163 goto nla_put_failure;
3164
3165 if (vxlan->flags & VXLAN_F_GBP &&
3166 nla_put_flag(skb, IFLA_VXLAN_GBP))
3167 goto nla_put_failure;
3168
3169 if (vxlan->flags & VXLAN_F_GPE &&
3170 nla_put_flag(skb, IFLA_VXLAN_GPE))
3171 goto nla_put_failure;
3172
3173 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3174 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3175 goto nla_put_failure;
3176
3177 return 0;
3178
3179 nla_put_failure:
3180 return -EMSGSIZE;
3181 }
3182
3183 static struct net *vxlan_get_link_net(const struct net_device *dev)
3184 {
3185 struct vxlan_dev *vxlan = netdev_priv(dev);
3186
3187 return vxlan->net;
3188 }
3189
3190 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3191 .kind = "vxlan",
3192 .maxtype = IFLA_VXLAN_MAX,
3193 .policy = vxlan_policy,
3194 .priv_size = sizeof(struct vxlan_dev),
3195 .setup = vxlan_setup,
3196 .validate = vxlan_validate,
3197 .newlink = vxlan_newlink,
3198 .dellink = vxlan_dellink,
3199 .get_size = vxlan_get_size,
3200 .fill_info = vxlan_fill_info,
3201 .get_link_net = vxlan_get_link_net,
3202 };
3203
3204 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3205 u8 name_assign_type,
3206 struct vxlan_config *conf)
3207 {
3208 struct nlattr *tb[IFLA_MAX + 1];
3209 struct net_device *dev;
3210 int err;
3211
3212 memset(&tb, 0, sizeof(tb));
3213
3214 dev = rtnl_create_link(net, name, name_assign_type,
3215 &vxlan_link_ops, tb);
3216 if (IS_ERR(dev))
3217 return dev;
3218
3219 err = vxlan_dev_configure(net, dev, conf);
3220 if (err < 0) {
3221 free_netdev(dev);
3222 return ERR_PTR(err);
3223 }
3224
3225 err = rtnl_configure_link(dev, NULL);
3226 if (err < 0) {
3227 LIST_HEAD(list_kill);
3228
3229 vxlan_dellink(dev, &list_kill);
3230 unregister_netdevice_many(&list_kill);
3231 return ERR_PTR(err);
3232 }
3233
3234 return dev;
3235 }
3236 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3237
3238 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3239 struct net_device *dev)
3240 {
3241 struct vxlan_dev *vxlan, *next;
3242 LIST_HEAD(list_kill);
3243
3244 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3245 struct vxlan_rdst *dst = &vxlan->default_dst;
3246
3247 /* In case we created vxlan device with carrier
3248 * and we loose the carrier due to module unload
3249 * we also need to remove vxlan device. In other
3250 * cases, it's not necessary and remote_ifindex
3251 * is 0 here, so no matches.
3252 */
3253 if (dst->remote_ifindex == dev->ifindex)
3254 vxlan_dellink(vxlan->dev, &list_kill);
3255 }
3256
3257 unregister_netdevice_many(&list_kill);
3258 }
3259
3260 static int vxlan_netdevice_event(struct notifier_block *unused,
3261 unsigned long event, void *ptr)
3262 {
3263 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3264 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3265
3266 if (event == NETDEV_UNREGISTER)
3267 vxlan_handle_lowerdev_unregister(vn, dev);
3268 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3269 vxlan_push_rx_ports(dev);
3270
3271 return NOTIFY_DONE;
3272 }
3273
3274 static struct notifier_block vxlan_notifier_block __read_mostly = {
3275 .notifier_call = vxlan_netdevice_event,
3276 };
3277
3278 static __net_init int vxlan_init_net(struct net *net)
3279 {
3280 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3281 unsigned int h;
3282
3283 INIT_LIST_HEAD(&vn->vxlan_list);
3284 spin_lock_init(&vn->sock_lock);
3285
3286 for (h = 0; h < PORT_HASH_SIZE; ++h)
3287 INIT_HLIST_HEAD(&vn->sock_list[h]);
3288
3289 return 0;
3290 }
3291
3292 static void __net_exit vxlan_exit_net(struct net *net)
3293 {
3294 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3295 struct vxlan_dev *vxlan, *next;
3296 struct net_device *dev, *aux;
3297 LIST_HEAD(list);
3298
3299 rtnl_lock();
3300 for_each_netdev_safe(net, dev, aux)
3301 if (dev->rtnl_link_ops == &vxlan_link_ops)
3302 unregister_netdevice_queue(dev, &list);
3303
3304 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3305 /* If vxlan->dev is in the same netns, it has already been added
3306 * to the list by the previous loop.
3307 */
3308 if (!net_eq(dev_net(vxlan->dev), net)) {
3309 gro_cells_destroy(&vxlan->gro_cells);
3310 unregister_netdevice_queue(vxlan->dev, &list);
3311 }
3312 }
3313
3314 unregister_netdevice_many(&list);
3315 rtnl_unlock();
3316 }
3317
3318 static struct pernet_operations vxlan_net_ops = {
3319 .init = vxlan_init_net,
3320 .exit = vxlan_exit_net,
3321 .id = &vxlan_net_id,
3322 .size = sizeof(struct vxlan_net),
3323 };
3324
3325 static int __init vxlan_init_module(void)
3326 {
3327 int rc;
3328
3329 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3330
3331 rc = register_pernet_subsys(&vxlan_net_ops);
3332 if (rc)
3333 goto out1;
3334
3335 rc = register_netdevice_notifier(&vxlan_notifier_block);
3336 if (rc)
3337 goto out2;
3338
3339 rc = rtnl_link_register(&vxlan_link_ops);
3340 if (rc)
3341 goto out3;
3342
3343 return 0;
3344 out3:
3345 unregister_netdevice_notifier(&vxlan_notifier_block);
3346 out2:
3347 unregister_pernet_subsys(&vxlan_net_ops);
3348 out1:
3349 return rc;
3350 }
3351 late_initcall(vxlan_init_module);
3352
3353 static void __exit vxlan_cleanup_module(void)
3354 {
3355 rtnl_link_unregister(&vxlan_link_ops);
3356 unregister_netdevice_notifier(&vxlan_notifier_block);
3357 unregister_pernet_subsys(&vxlan_net_ops);
3358 /* rcu_barrier() is called by netns */
3359 }
3360 module_exit(vxlan_cleanup_module);
3361
3362 MODULE_LICENSE("GPL");
3363 MODULE_VERSION(VXLAN_VERSION);
3364 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3365 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3366 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support