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hwrng: core - Don't use a stack buffer in add_early_randomness()
[linux/fpc-iii.git] / drivers / net / vxlan.c
blobe7d16687538b8478fda533e2ceaccdcb83961405
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 = 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 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
947
948 /* The vxlan_sock is only used by dev, leaving group has
949 * no effect on other vxlan devices.
950 */
951 if (family == AF_INET && dev->vn4_sock &&
952 atomic_read(&dev->vn4_sock->refcnt) == 1)
953 return false;
954 #if IS_ENABLED(CONFIG_IPV6)
955 if (family == AF_INET6 && dev->vn6_sock &&
956 atomic_read(&dev->vn6_sock->refcnt) == 1)
957 return false;
958 #endif
959
960 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
961 if (!netif_running(vxlan->dev) || vxlan == dev)
962 continue;
963
964 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
965 continue;
966 #if IS_ENABLED(CONFIG_IPV6)
967 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
968 continue;
969 #endif
970
971 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
972 &dev->default_dst.remote_ip))
973 continue;
974
975 if (vxlan->default_dst.remote_ifindex !=
976 dev->default_dst.remote_ifindex)
977 continue;
978
979 return true;
980 }
981
982 return false;
983 }
984
985 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
986 {
987 struct vxlan_net *vn;
988
989 if (!vs)
990 return false;
991 if (!atomic_dec_and_test(&vs->refcnt))
992 return false;
993
994 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
995 spin_lock(&vn->sock_lock);
996 hlist_del_rcu(&vs->hlist);
997 udp_tunnel_notify_del_rx_port(vs->sock,
998 (vs->flags & VXLAN_F_GPE) ?
999 UDP_TUNNEL_TYPE_VXLAN_GPE :
1000 UDP_TUNNEL_TYPE_VXLAN);
1001 spin_unlock(&vn->sock_lock);
1002
1003 return true;
1004 }
1005
1006 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1007 {
1008 bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock);
1009 #if IS_ENABLED(CONFIG_IPV6)
1010 bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock);
1011 #endif
1012
1013 synchronize_net();
1014
1015 if (ipv4) {
1016 udp_tunnel_sock_release(vxlan->vn4_sock->sock);
1017 kfree(vxlan->vn4_sock);
1018 }
1019
1020 #if IS_ENABLED(CONFIG_IPV6)
1021 if (ipv6) {
1022 udp_tunnel_sock_release(vxlan->vn6_sock->sock);
1023 kfree(vxlan->vn6_sock);
1024 }
1025 #endif
1026 }
1027
1028 /* Update multicast group membership when first VNI on
1029 * multicast address is brought up
1030 */
1031 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1032 {
1033 struct sock *sk;
1034 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1035 int ifindex = vxlan->default_dst.remote_ifindex;
1036 int ret = -EINVAL;
1037
1038 if (ip->sa.sa_family == AF_INET) {
1039 struct ip_mreqn mreq = {
1040 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1041 .imr_ifindex = ifindex,
1042 };
1043
1044 sk = vxlan->vn4_sock->sock->sk;
1045 lock_sock(sk);
1046 ret = ip_mc_join_group(sk, &mreq);
1047 release_sock(sk);
1048 #if IS_ENABLED(CONFIG_IPV6)
1049 } else {
1050 sk = vxlan->vn6_sock->sock->sk;
1051 lock_sock(sk);
1052 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1053 &ip->sin6.sin6_addr);
1054 release_sock(sk);
1055 #endif
1056 }
1057
1058 return ret;
1059 }
1060
1061 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1062 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1063 {
1064 struct sock *sk;
1065 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1066 int ifindex = vxlan->default_dst.remote_ifindex;
1067 int ret = -EINVAL;
1068
1069 if (ip->sa.sa_family == AF_INET) {
1070 struct ip_mreqn mreq = {
1071 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1072 .imr_ifindex = ifindex,
1073 };
1074
1075 sk = vxlan->vn4_sock->sock->sk;
1076 lock_sock(sk);
1077 ret = ip_mc_leave_group(sk, &mreq);
1078 release_sock(sk);
1079 #if IS_ENABLED(CONFIG_IPV6)
1080 } else {
1081 sk = vxlan->vn6_sock->sock->sk;
1082 lock_sock(sk);
1083 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1084 &ip->sin6.sin6_addr);
1085 release_sock(sk);
1086 #endif
1087 }
1088
1089 return ret;
1090 }
1091
1092 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1093 struct sk_buff *skb, u32 vxflags)
1094 {
1095 size_t start, offset;
1096
1097 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1098 goto out;
1099
1100 start = vxlan_rco_start(unparsed->vx_vni);
1101 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1102
1103 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1104 return false;
1105
1106 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1107 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1108 out:
1109 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1110 unparsed->vx_vni &= VXLAN_VNI_MASK;
1111 return true;
1112 }
1113
1114 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1115 struct sk_buff *skb, u32 vxflags,
1116 struct vxlan_metadata *md)
1117 {
1118 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1119 struct metadata_dst *tun_dst;
1120
1121 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1122 goto out;
1123
1124 md->gbp = ntohs(gbp->policy_id);
1125
1126 tun_dst = (struct metadata_dst *)skb_dst(skb);
1127 if (tun_dst) {
1128 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1129 tun_dst->u.tun_info.options_len = sizeof(*md);
1130 }
1131 if (gbp->dont_learn)
1132 md->gbp |= VXLAN_GBP_DONT_LEARN;
1133
1134 if (gbp->policy_applied)
1135 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1136
1137 /* In flow-based mode, GBP is carried in dst_metadata */
1138 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1139 skb->mark = md->gbp;
1140 out:
1141 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1142 }
1143
1144 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1145 __be16 *protocol,
1146 struct sk_buff *skb, u32 vxflags)
1147 {
1148 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1149
1150 /* Need to have Next Protocol set for interfaces in GPE mode. */
1151 if (!gpe->np_applied)
1152 return false;
1153 /* "The initial version is 0. If a receiver does not support the
1154 * version indicated it MUST drop the packet.
1155 */
1156 if (gpe->version != 0)
1157 return false;
1158 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1159 * processing MUST occur." However, we don't implement OAM
1160 * processing, thus drop the packet.
1161 */
1162 if (gpe->oam_flag)
1163 return false;
1164
1165 switch (gpe->next_protocol) {
1166 case VXLAN_GPE_NP_IPV4:
1167 *protocol = htons(ETH_P_IP);
1168 break;
1169 case VXLAN_GPE_NP_IPV6:
1170 *protocol = htons(ETH_P_IPV6);
1171 break;
1172 case VXLAN_GPE_NP_ETHERNET:
1173 *protocol = htons(ETH_P_TEB);
1174 break;
1175 default:
1176 return false;
1177 }
1178
1179 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1180 return true;
1181 }
1182
1183 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1184 struct vxlan_sock *vs,
1185 struct sk_buff *skb)
1186 {
1187 union vxlan_addr saddr;
1188
1189 skb_reset_mac_header(skb);
1190 skb->protocol = eth_type_trans(skb, vxlan->dev);
1191 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1192
1193 /* Ignore packet loops (and multicast echo) */
1194 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1195 return false;
1196
1197 /* Get address from the outer IP header */
1198 if (vxlan_get_sk_family(vs) == AF_INET) {
1199 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1200 saddr.sa.sa_family = AF_INET;
1201 #if IS_ENABLED(CONFIG_IPV6)
1202 } else {
1203 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1204 saddr.sa.sa_family = AF_INET6;
1205 #endif
1206 }
1207
1208 if ((vxlan->flags & VXLAN_F_LEARN) &&
1209 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1210 return false;
1211
1212 return true;
1213 }
1214
1215 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1216 struct sk_buff *skb)
1217 {
1218 int err = 0;
1219
1220 if (vxlan_get_sk_family(vs) == AF_INET)
1221 err = IP_ECN_decapsulate(oiph, skb);
1222 #if IS_ENABLED(CONFIG_IPV6)
1223 else
1224 err = IP6_ECN_decapsulate(oiph, skb);
1225 #endif
1226
1227 if (unlikely(err) && log_ecn_error) {
1228 if (vxlan_get_sk_family(vs) == AF_INET)
1229 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1230 &((struct iphdr *)oiph)->saddr,
1231 ((struct iphdr *)oiph)->tos);
1232 else
1233 net_info_ratelimited("non-ECT from %pI6\n",
1234 &((struct ipv6hdr *)oiph)->saddr);
1235 }
1236 return err <= 1;
1237 }
1238
1239 /* Callback from net/ipv4/udp.c to receive packets */
1240 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1241 {
1242 struct pcpu_sw_netstats *stats;
1243 struct vxlan_dev *vxlan;
1244 struct vxlan_sock *vs;
1245 struct vxlanhdr unparsed;
1246 struct vxlan_metadata _md;
1247 struct vxlan_metadata *md = &_md;
1248 __be16 protocol = htons(ETH_P_TEB);
1249 bool raw_proto = false;
1250 void *oiph;
1251
1252 /* Need UDP and VXLAN header to be present */
1253 if (!pskb_may_pull(skb, VXLAN_HLEN))
1254 goto drop;
1255
1256 unparsed = *vxlan_hdr(skb);
1257 /* VNI flag always required to be set */
1258 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1259 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1260 ntohl(vxlan_hdr(skb)->vx_flags),
1261 ntohl(vxlan_hdr(skb)->vx_vni));
1262 /* Return non vxlan pkt */
1263 goto drop;
1264 }
1265 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1266 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1267
1268 vs = rcu_dereference_sk_user_data(sk);
1269 if (!vs)
1270 goto drop;
1271
1272 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1273 if (!vxlan)
1274 goto drop;
1275
1276 /* For backwards compatibility, only allow reserved fields to be
1277 * used by VXLAN extensions if explicitly requested.
1278 */
1279 if (vs->flags & VXLAN_F_GPE) {
1280 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1281 goto drop;
1282 raw_proto = true;
1283 }
1284
1285 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1286 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1287 goto drop;
1288
1289 if (vxlan_collect_metadata(vs)) {
1290 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1291 struct metadata_dst *tun_dst;
1292
1293 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1294 key32_to_tunnel_id(vni), sizeof(*md));
1295
1296 if (!tun_dst)
1297 goto drop;
1298
1299 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1300
1301 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1302 } else {
1303 memset(md, 0, sizeof(*md));
1304 }
1305
1306 if (vs->flags & VXLAN_F_REMCSUM_RX)
1307 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1308 goto drop;
1309 if (vs->flags & VXLAN_F_GBP)
1310 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1311 /* Note that GBP and GPE can never be active together. This is
1312 * ensured in vxlan_dev_configure.
1313 */
1314
1315 if (unparsed.vx_flags || unparsed.vx_vni) {
1316 /* If there are any unprocessed flags remaining treat
1317 * this as a malformed packet. This behavior diverges from
1318 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1319 * in reserved fields are to be ignored. The approach here
1320 * maintains compatibility with previous stack code, and also
1321 * is more robust and provides a little more security in
1322 * adding extensions to VXLAN.
1323 */
1324 goto drop;
1325 }
1326
1327 if (!raw_proto) {
1328 if (!vxlan_set_mac(vxlan, vs, skb))
1329 goto drop;
1330 } else {
1331 skb_reset_mac_header(skb);
1332 skb->dev = vxlan->dev;
1333 skb->pkt_type = PACKET_HOST;
1334 }
1335
1336 oiph = skb_network_header(skb);
1337 skb_reset_network_header(skb);
1338
1339 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1340 ++vxlan->dev->stats.rx_frame_errors;
1341 ++vxlan->dev->stats.rx_errors;
1342 goto drop;
1343 }
1344
1345 stats = this_cpu_ptr(vxlan->dev->tstats);
1346 u64_stats_update_begin(&stats->syncp);
1347 stats->rx_packets++;
1348 stats->rx_bytes += skb->len;
1349 u64_stats_update_end(&stats->syncp);
1350
1351 gro_cells_receive(&vxlan->gro_cells, skb);
1352 return 0;
1353
1354 drop:
1355 /* Consume bad packet */
1356 kfree_skb(skb);
1357 return 0;
1358 }
1359
1360 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1361 {
1362 struct vxlan_dev *vxlan = netdev_priv(dev);
1363 struct arphdr *parp;
1364 u8 *arpptr, *sha;
1365 __be32 sip, tip;
1366 struct neighbour *n;
1367
1368 if (dev->flags & IFF_NOARP)
1369 goto out;
1370
1371 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1372 dev->stats.tx_dropped++;
1373 goto out;
1374 }
1375 parp = arp_hdr(skb);
1376
1377 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1378 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1379 parp->ar_pro != htons(ETH_P_IP) ||
1380 parp->ar_op != htons(ARPOP_REQUEST) ||
1381 parp->ar_hln != dev->addr_len ||
1382 parp->ar_pln != 4)
1383 goto out;
1384 arpptr = (u8 *)parp + sizeof(struct arphdr);
1385 sha = arpptr;
1386 arpptr += dev->addr_len; /* sha */
1387 memcpy(&sip, arpptr, sizeof(sip));
1388 arpptr += sizeof(sip);
1389 arpptr += dev->addr_len; /* tha */
1390 memcpy(&tip, arpptr, sizeof(tip));
1391
1392 if (ipv4_is_loopback(tip) ||
1393 ipv4_is_multicast(tip))
1394 goto out;
1395
1396 n = neigh_lookup(&arp_tbl, &tip, dev);
1397
1398 if (n) {
1399 struct vxlan_fdb *f;
1400 struct sk_buff *reply;
1401
1402 if (!(n->nud_state & NUD_CONNECTED)) {
1403 neigh_release(n);
1404 goto out;
1405 }
1406
1407 f = vxlan_find_mac(vxlan, n->ha);
1408 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1409 /* bridge-local neighbor */
1410 neigh_release(n);
1411 goto out;
1412 }
1413
1414 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1415 n->ha, sha);
1416
1417 neigh_release(n);
1418
1419 if (reply == NULL)
1420 goto out;
1421
1422 skb_reset_mac_header(reply);
1423 __skb_pull(reply, skb_network_offset(reply));
1424 reply->ip_summed = CHECKSUM_UNNECESSARY;
1425 reply->pkt_type = PACKET_HOST;
1426
1427 if (netif_rx_ni(reply) == NET_RX_DROP)
1428 dev->stats.rx_dropped++;
1429 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1430 union vxlan_addr ipa = {
1431 .sin.sin_addr.s_addr = tip,
1432 .sin.sin_family = AF_INET,
1433 };
1434
1435 vxlan_ip_miss(dev, &ipa);
1436 }
1437 out:
1438 consume_skb(skb);
1439 return NETDEV_TX_OK;
1440 }
1441
1442 #if IS_ENABLED(CONFIG_IPV6)
1443 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1444 struct neighbour *n, bool isrouter)
1445 {
1446 struct net_device *dev = request->dev;
1447 struct sk_buff *reply;
1448 struct nd_msg *ns, *na;
1449 struct ipv6hdr *pip6;
1450 u8 *daddr;
1451 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1452 int ns_olen;
1453 int i, len;
1454
1455 if (dev == NULL)
1456 return NULL;
1457
1458 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1459 sizeof(*na) + na_olen + dev->needed_tailroom;
1460 reply = alloc_skb(len, GFP_ATOMIC);
1461 if (reply == NULL)
1462 return NULL;
1463
1464 reply->protocol = htons(ETH_P_IPV6);
1465 reply->dev = dev;
1466 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1467 skb_push(reply, sizeof(struct ethhdr));
1468 skb_reset_mac_header(reply);
1469
1470 ns = (struct nd_msg *)skb_transport_header(request);
1471
1472 daddr = eth_hdr(request)->h_source;
1473 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1474 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1475 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1476 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1477 break;
1478 }
1479 }
1480
1481 /* Ethernet header */
1482 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1483 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1484 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1485 reply->protocol = htons(ETH_P_IPV6);
1486
1487 skb_pull(reply, sizeof(struct ethhdr));
1488 skb_reset_network_header(reply);
1489 skb_put(reply, sizeof(struct ipv6hdr));
1490
1491 /* IPv6 header */
1492
1493 pip6 = ipv6_hdr(reply);
1494 memset(pip6, 0, sizeof(struct ipv6hdr));
1495 pip6->version = 6;
1496 pip6->priority = ipv6_hdr(request)->priority;
1497 pip6->nexthdr = IPPROTO_ICMPV6;
1498 pip6->hop_limit = 255;
1499 pip6->daddr = ipv6_hdr(request)->saddr;
1500 pip6->saddr = *(struct in6_addr *)n->primary_key;
1501
1502 skb_pull(reply, sizeof(struct ipv6hdr));
1503 skb_reset_transport_header(reply);
1504
1505 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1506
1507 /* Neighbor Advertisement */
1508 memset(na, 0, sizeof(*na)+na_olen);
1509 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1510 na->icmph.icmp6_router = isrouter;
1511 na->icmph.icmp6_override = 1;
1512 na->icmph.icmp6_solicited = 1;
1513 na->target = ns->target;
1514 ether_addr_copy(&na->opt[2], n->ha);
1515 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1516 na->opt[1] = na_olen >> 3;
1517
1518 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1519 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1520 csum_partial(na, sizeof(*na)+na_olen, 0));
1521
1522 pip6->payload_len = htons(sizeof(*na)+na_olen);
1523
1524 skb_push(reply, sizeof(struct ipv6hdr));
1525
1526 reply->ip_summed = CHECKSUM_UNNECESSARY;
1527
1528 return reply;
1529 }
1530
1531 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1532 {
1533 struct vxlan_dev *vxlan = netdev_priv(dev);
1534 struct nd_msg *msg;
1535 const struct ipv6hdr *iphdr;
1536 const struct in6_addr *saddr, *daddr;
1537 struct neighbour *n;
1538 struct inet6_dev *in6_dev;
1539
1540 in6_dev = __in6_dev_get(dev);
1541 if (!in6_dev)
1542 goto out;
1543
1544 iphdr = ipv6_hdr(skb);
1545 saddr = &iphdr->saddr;
1546 daddr = &iphdr->daddr;
1547
1548 msg = (struct nd_msg *)skb_transport_header(skb);
1549 if (msg->icmph.icmp6_code != 0 ||
1550 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1551 goto out;
1552
1553 if (ipv6_addr_loopback(daddr) ||
1554 ipv6_addr_is_multicast(&msg->target))
1555 goto out;
1556
1557 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1558
1559 if (n) {
1560 struct vxlan_fdb *f;
1561 struct sk_buff *reply;
1562
1563 if (!(n->nud_state & NUD_CONNECTED)) {
1564 neigh_release(n);
1565 goto out;
1566 }
1567
1568 f = vxlan_find_mac(vxlan, n->ha);
1569 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1570 /* bridge-local neighbor */
1571 neigh_release(n);
1572 goto out;
1573 }
1574
1575 reply = vxlan_na_create(skb, n,
1576 !!(f ? f->flags & NTF_ROUTER : 0));
1577
1578 neigh_release(n);
1579
1580 if (reply == NULL)
1581 goto out;
1582
1583 if (netif_rx_ni(reply) == NET_RX_DROP)
1584 dev->stats.rx_dropped++;
1585
1586 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1587 union vxlan_addr ipa = {
1588 .sin6.sin6_addr = msg->target,
1589 .sin6.sin6_family = AF_INET6,
1590 };
1591
1592 vxlan_ip_miss(dev, &ipa);
1593 }
1594
1595 out:
1596 consume_skb(skb);
1597 return NETDEV_TX_OK;
1598 }
1599 #endif
1600
1601 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1602 {
1603 struct vxlan_dev *vxlan = netdev_priv(dev);
1604 struct neighbour *n;
1605
1606 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1607 return false;
1608
1609 n = NULL;
1610 switch (ntohs(eth_hdr(skb)->h_proto)) {
1611 case ETH_P_IP:
1612 {
1613 struct iphdr *pip;
1614
1615 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1616 return false;
1617 pip = ip_hdr(skb);
1618 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1619 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1620 union vxlan_addr ipa = {
1621 .sin.sin_addr.s_addr = pip->daddr,
1622 .sin.sin_family = AF_INET,
1623 };
1624
1625 vxlan_ip_miss(dev, &ipa);
1626 return false;
1627 }
1628
1629 break;
1630 }
1631 #if IS_ENABLED(CONFIG_IPV6)
1632 case ETH_P_IPV6:
1633 {
1634 struct ipv6hdr *pip6;
1635
1636 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1637 return false;
1638 pip6 = ipv6_hdr(skb);
1639 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1640 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1641 union vxlan_addr ipa = {
1642 .sin6.sin6_addr = pip6->daddr,
1643 .sin6.sin6_family = AF_INET6,
1644 };
1645
1646 vxlan_ip_miss(dev, &ipa);
1647 return false;
1648 }
1649
1650 break;
1651 }
1652 #endif
1653 default:
1654 return false;
1655 }
1656
1657 if (n) {
1658 bool diff;
1659
1660 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1661 if (diff) {
1662 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1663 dev->addr_len);
1664 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1665 }
1666 neigh_release(n);
1667 return diff;
1668 }
1669
1670 return false;
1671 }
1672
1673 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1674 struct vxlan_metadata *md)
1675 {
1676 struct vxlanhdr_gbp *gbp;
1677
1678 if (!md->gbp)
1679 return;
1680
1681 gbp = (struct vxlanhdr_gbp *)vxh;
1682 vxh->vx_flags |= VXLAN_HF_GBP;
1683
1684 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1685 gbp->dont_learn = 1;
1686
1687 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1688 gbp->policy_applied = 1;
1689
1690 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1691 }
1692
1693 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1694 __be16 protocol)
1695 {
1696 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1697
1698 gpe->np_applied = 1;
1699
1700 switch (protocol) {
1701 case htons(ETH_P_IP):
1702 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1703 return 0;
1704 case htons(ETH_P_IPV6):
1705 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1706 return 0;
1707 case htons(ETH_P_TEB):
1708 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1709 return 0;
1710 }
1711 return -EPFNOSUPPORT;
1712 }
1713
1714 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1715 int iphdr_len, __be32 vni,
1716 struct vxlan_metadata *md, u32 vxflags,
1717 bool udp_sum)
1718 {
1719 struct vxlanhdr *vxh;
1720 int min_headroom;
1721 int err;
1722 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1723 __be16 inner_protocol = htons(ETH_P_TEB);
1724
1725 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1726 skb->ip_summed == CHECKSUM_PARTIAL) {
1727 int csum_start = skb_checksum_start_offset(skb);
1728
1729 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1730 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1731 (skb->csum_offset == offsetof(struct udphdr, check) ||
1732 skb->csum_offset == offsetof(struct tcphdr, check)))
1733 type |= SKB_GSO_TUNNEL_REMCSUM;
1734 }
1735
1736 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1737 + VXLAN_HLEN + iphdr_len
1738 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1739
1740 /* Need space for new headers (invalidates iph ptr) */
1741 err = skb_cow_head(skb, min_headroom);
1742 if (unlikely(err))
1743 goto out_free;
1744
1745 skb = vlan_hwaccel_push_inside(skb);
1746 if (WARN_ON(!skb))
1747 return -ENOMEM;
1748
1749 err = iptunnel_handle_offloads(skb, type);
1750 if (err)
1751 goto out_free;
1752
1753 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1754 vxh->vx_flags = VXLAN_HF_VNI;
1755 vxh->vx_vni = vxlan_vni_field(vni);
1756
1757 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1758 unsigned int start;
1759
1760 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1761 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1762 vxh->vx_flags |= VXLAN_HF_RCO;
1763
1764 if (!skb_is_gso(skb)) {
1765 skb->ip_summed = CHECKSUM_NONE;
1766 skb->encapsulation = 0;
1767 }
1768 }
1769
1770 if (vxflags & VXLAN_F_GBP)
1771 vxlan_build_gbp_hdr(vxh, vxflags, md);
1772 if (vxflags & VXLAN_F_GPE) {
1773 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1774 if (err < 0)
1775 goto out_free;
1776 inner_protocol = skb->protocol;
1777 }
1778
1779 skb_set_inner_protocol(skb, inner_protocol);
1780 return 0;
1781
1782 out_free:
1783 kfree_skb(skb);
1784 return err;
1785 }
1786
1787 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1788 struct sk_buff *skb, int oif, u8 tos,
1789 __be32 daddr, __be32 *saddr,
1790 struct dst_cache *dst_cache,
1791 const struct ip_tunnel_info *info)
1792 {
1793 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1794 struct rtable *rt = NULL;
1795 struct flowi4 fl4;
1796
1797 if (tos && !info)
1798 use_cache = false;
1799 if (use_cache) {
1800 rt = dst_cache_get_ip4(dst_cache, saddr);
1801 if (rt)
1802 return rt;
1803 }
1804
1805 memset(&fl4, 0, sizeof(fl4));
1806 fl4.flowi4_oif = oif;
1807 fl4.flowi4_tos = RT_TOS(tos);
1808 fl4.flowi4_mark = skb->mark;
1809 fl4.flowi4_proto = IPPROTO_UDP;
1810 fl4.daddr = daddr;
1811 fl4.saddr = *saddr;
1812
1813 rt = ip_route_output_key(vxlan->net, &fl4);
1814 if (!IS_ERR(rt)) {
1815 *saddr = fl4.saddr;
1816 if (use_cache)
1817 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1818 }
1819 return rt;
1820 }
1821
1822 #if IS_ENABLED(CONFIG_IPV6)
1823 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1824 struct sk_buff *skb, int oif, u8 tos,
1825 __be32 label,
1826 const struct in6_addr *daddr,
1827 struct in6_addr *saddr,
1828 struct dst_cache *dst_cache,
1829 const struct ip_tunnel_info *info)
1830 {
1831 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1832 struct dst_entry *ndst;
1833 struct flowi6 fl6;
1834 int err;
1835
1836 if (tos && !info)
1837 use_cache = false;
1838 if (use_cache) {
1839 ndst = dst_cache_get_ip6(dst_cache, saddr);
1840 if (ndst)
1841 return ndst;
1842 }
1843
1844 memset(&fl6, 0, sizeof(fl6));
1845 fl6.flowi6_oif = oif;
1846 fl6.daddr = *daddr;
1847 fl6.saddr = *saddr;
1848 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1849 fl6.flowi6_mark = skb->mark;
1850 fl6.flowi6_proto = IPPROTO_UDP;
1851
1852 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1853 vxlan->vn6_sock->sock->sk,
1854 &ndst, &fl6);
1855 if (err < 0)
1856 return ERR_PTR(err);
1857
1858 *saddr = fl6.saddr;
1859 if (use_cache)
1860 dst_cache_set_ip6(dst_cache, ndst, saddr);
1861 return ndst;
1862 }
1863 #endif
1864
1865 /* Bypass encapsulation if the destination is local */
1866 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1867 struct vxlan_dev *dst_vxlan)
1868 {
1869 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1870 union vxlan_addr loopback;
1871 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1872 struct net_device *dev = skb->dev;
1873 int len = skb->len;
1874
1875 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1876 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1877 skb->pkt_type = PACKET_HOST;
1878 skb->encapsulation = 0;
1879 skb->dev = dst_vxlan->dev;
1880 __skb_pull(skb, skb_network_offset(skb));
1881
1882 if (remote_ip->sa.sa_family == AF_INET) {
1883 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1884 loopback.sa.sa_family = AF_INET;
1885 #if IS_ENABLED(CONFIG_IPV6)
1886 } else {
1887 loopback.sin6.sin6_addr = in6addr_loopback;
1888 loopback.sa.sa_family = AF_INET6;
1889 #endif
1890 }
1891
1892 if (dst_vxlan->flags & VXLAN_F_LEARN)
1893 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1894
1895 u64_stats_update_begin(&tx_stats->syncp);
1896 tx_stats->tx_packets++;
1897 tx_stats->tx_bytes += len;
1898 u64_stats_update_end(&tx_stats->syncp);
1899
1900 if (netif_rx(skb) == NET_RX_SUCCESS) {
1901 u64_stats_update_begin(&rx_stats->syncp);
1902 rx_stats->rx_packets++;
1903 rx_stats->rx_bytes += len;
1904 u64_stats_update_end(&rx_stats->syncp);
1905 } else {
1906 dev->stats.rx_dropped++;
1907 }
1908 }
1909
1910 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1911 struct vxlan_rdst *rdst, bool did_rsc)
1912 {
1913 struct dst_cache *dst_cache;
1914 struct ip_tunnel_info *info;
1915 struct vxlan_dev *vxlan = netdev_priv(dev);
1916 struct sock *sk;
1917 struct rtable *rt = NULL;
1918 const struct iphdr *old_iph;
1919 union vxlan_addr *dst;
1920 union vxlan_addr remote_ip, local_ip;
1921 union vxlan_addr *src;
1922 struct vxlan_metadata _md;
1923 struct vxlan_metadata *md = &_md;
1924 __be16 src_port = 0, dst_port;
1925 __be32 vni, label;
1926 __be16 df = 0;
1927 __u8 tos, ttl;
1928 int err;
1929 u32 flags = vxlan->flags;
1930 bool udp_sum = false;
1931 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1932
1933 info = skb_tunnel_info(skb);
1934
1935 if (rdst) {
1936 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1937 vni = rdst->remote_vni;
1938 dst = &rdst->remote_ip;
1939 src = &vxlan->cfg.saddr;
1940 dst_cache = &rdst->dst_cache;
1941 } else {
1942 if (!info) {
1943 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1944 dev->name);
1945 goto drop;
1946 }
1947 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1948 vni = tunnel_id_to_key32(info->key.tun_id);
1949 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1950 if (remote_ip.sa.sa_family == AF_INET) {
1951 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1952 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
1953 } else {
1954 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1955 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
1956 }
1957 dst = &remote_ip;
1958 src = &local_ip;
1959 dst_cache = &info->dst_cache;
1960 }
1961
1962 if (vxlan_addr_any(dst)) {
1963 if (did_rsc) {
1964 /* short-circuited back to local bridge */
1965 vxlan_encap_bypass(skb, vxlan, vxlan);
1966 return;
1967 }
1968 goto drop;
1969 }
1970
1971 old_iph = ip_hdr(skb);
1972
1973 ttl = vxlan->cfg.ttl;
1974 if (!ttl && vxlan_addr_multicast(dst))
1975 ttl = 1;
1976
1977 tos = vxlan->cfg.tos;
1978 if (tos == 1)
1979 tos = ip_tunnel_get_dsfield(old_iph, skb);
1980
1981 label = vxlan->cfg.label;
1982 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1983 vxlan->cfg.port_max, true);
1984
1985 if (info) {
1986 ttl = info->key.ttl;
1987 tos = info->key.tos;
1988 label = info->key.label;
1989 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1990
1991 if (info->options_len)
1992 md = ip_tunnel_info_opts(info);
1993 } else {
1994 md->gbp = skb->mark;
1995 }
1996
1997 if (dst->sa.sa_family == AF_INET) {
1998 if (!vxlan->vn4_sock)
1999 goto drop;
2000 sk = vxlan->vn4_sock->sock->sk;
2001
2002 rt = vxlan_get_route(vxlan, skb,
2003 rdst ? rdst->remote_ifindex : 0, tos,
2004 dst->sin.sin_addr.s_addr,
2005 &src->sin.sin_addr.s_addr,
2006 dst_cache, info);
2007 if (IS_ERR(rt)) {
2008 netdev_dbg(dev, "no route to %pI4\n",
2009 &dst->sin.sin_addr.s_addr);
2010 dev->stats.tx_carrier_errors++;
2011 goto tx_error;
2012 }
2013
2014 if (rt->dst.dev == dev) {
2015 netdev_dbg(dev, "circular route to %pI4\n",
2016 &dst->sin.sin_addr.s_addr);
2017 dev->stats.collisions++;
2018 goto rt_tx_error;
2019 }
2020
2021 /* Bypass encapsulation if the destination is local */
2022 if (!info && rt->rt_flags & RTCF_LOCAL &&
2023 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2024 struct vxlan_dev *dst_vxlan;
2025
2026 ip_rt_put(rt);
2027 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2028 dst->sa.sa_family, dst_port,
2029 vxlan->flags);
2030 if (!dst_vxlan)
2031 goto tx_error;
2032 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2033 return;
2034 }
2035
2036 if (!info)
2037 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2038 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2039 df = htons(IP_DF);
2040
2041 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2042 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2043 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2044 vni, md, flags, udp_sum);
2045 if (err < 0)
2046 goto xmit_tx_error;
2047
2048 udp_tunnel_xmit_skb(rt, sk, skb, src->sin.sin_addr.s_addr,
2049 dst->sin.sin_addr.s_addr, tos, ttl, df,
2050 src_port, dst_port, xnet, !udp_sum);
2051 #if IS_ENABLED(CONFIG_IPV6)
2052 } else {
2053 struct dst_entry *ndst;
2054 u32 rt6i_flags;
2055
2056 if (!vxlan->vn6_sock)
2057 goto drop;
2058 sk = vxlan->vn6_sock->sock->sk;
2059
2060 ndst = vxlan6_get_route(vxlan, skb,
2061 rdst ? rdst->remote_ifindex : 0, tos,
2062 label, &dst->sin6.sin6_addr,
2063 &src->sin6.sin6_addr,
2064 dst_cache, info);
2065 if (IS_ERR(ndst)) {
2066 netdev_dbg(dev, "no route to %pI6\n",
2067 &dst->sin6.sin6_addr);
2068 dev->stats.tx_carrier_errors++;
2069 goto tx_error;
2070 }
2071
2072 if (ndst->dev == dev) {
2073 netdev_dbg(dev, "circular route to %pI6\n",
2074 &dst->sin6.sin6_addr);
2075 dst_release(ndst);
2076 dev->stats.collisions++;
2077 goto tx_error;
2078 }
2079
2080 /* Bypass encapsulation if the destination is local */
2081 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2082 if (!info && rt6i_flags & RTF_LOCAL &&
2083 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2084 struct vxlan_dev *dst_vxlan;
2085
2086 dst_release(ndst);
2087 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2088 dst->sa.sa_family, dst_port,
2089 vxlan->flags);
2090 if (!dst_vxlan)
2091 goto tx_error;
2092 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2093 return;
2094 }
2095
2096 if (!info)
2097 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2098
2099 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2100 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2101 skb_scrub_packet(skb, xnet);
2102 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2103 vni, md, flags, udp_sum);
2104 if (err < 0) {
2105 dst_release(ndst);
2106 dev->stats.tx_errors++;
2107 return;
2108 }
2109 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2110 &src->sin6.sin6_addr,
2111 &dst->sin6.sin6_addr, tos, ttl,
2112 label, src_port, dst_port, !udp_sum);
2113 #endif
2114 }
2115
2116 return;
2117
2118 drop:
2119 dev->stats.tx_dropped++;
2120 goto tx_free;
2121
2122 xmit_tx_error:
2123 /* skb is already freed. */
2124 skb = NULL;
2125 rt_tx_error:
2126 ip_rt_put(rt);
2127 tx_error:
2128 dev->stats.tx_errors++;
2129 tx_free:
2130 dev_kfree_skb(skb);
2131 }
2132
2133 /* Transmit local packets over Vxlan
2134 *
2135 * Outer IP header inherits ECN and DF from inner header.
2136 * Outer UDP destination is the VXLAN assigned port.
2137 * source port is based on hash of flow
2138 */
2139 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2140 {
2141 struct vxlan_dev *vxlan = netdev_priv(dev);
2142 const struct ip_tunnel_info *info;
2143 struct ethhdr *eth;
2144 bool did_rsc = false;
2145 struct vxlan_rdst *rdst, *fdst = NULL;
2146 struct vxlan_fdb *f;
2147
2148 info = skb_tunnel_info(skb);
2149
2150 skb_reset_mac_header(skb);
2151
2152 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2153 if (info && info->mode & IP_TUNNEL_INFO_TX)
2154 vxlan_xmit_one(skb, dev, NULL, false);
2155 else
2156 kfree_skb(skb);
2157 return NETDEV_TX_OK;
2158 }
2159
2160 if (vxlan->flags & VXLAN_F_PROXY) {
2161 eth = eth_hdr(skb);
2162 if (ntohs(eth->h_proto) == ETH_P_ARP)
2163 return arp_reduce(dev, skb);
2164 #if IS_ENABLED(CONFIG_IPV6)
2165 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2166 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2167 + sizeof(struct nd_msg)) &&
2168 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2169 struct nd_msg *msg;
2170
2171 msg = (struct nd_msg *)skb_transport_header(skb);
2172 if (msg->icmph.icmp6_code == 0 &&
2173 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2174 return neigh_reduce(dev, skb);
2175 }
2176 #endif
2177 }
2178
2179 eth = eth_hdr(skb);
2180 f = vxlan_find_mac(vxlan, eth->h_dest);
2181 did_rsc = false;
2182
2183 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2184 (ntohs(eth->h_proto) == ETH_P_IP ||
2185 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2186 did_rsc = route_shortcircuit(dev, skb);
2187 if (did_rsc)
2188 f = vxlan_find_mac(vxlan, eth->h_dest);
2189 }
2190
2191 if (f == NULL) {
2192 f = vxlan_find_mac(vxlan, all_zeros_mac);
2193 if (f == NULL) {
2194 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2195 !is_multicast_ether_addr(eth->h_dest))
2196 vxlan_fdb_miss(vxlan, eth->h_dest);
2197
2198 dev->stats.tx_dropped++;
2199 kfree_skb(skb);
2200 return NETDEV_TX_OK;
2201 }
2202 }
2203
2204 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2205 struct sk_buff *skb1;
2206
2207 if (!fdst) {
2208 fdst = rdst;
2209 continue;
2210 }
2211 skb1 = skb_clone(skb, GFP_ATOMIC);
2212 if (skb1)
2213 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2214 }
2215
2216 if (fdst)
2217 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2218 else
2219 kfree_skb(skb);
2220 return NETDEV_TX_OK;
2221 }
2222
2223 /* Walk the forwarding table and purge stale entries */
2224 static void vxlan_cleanup(unsigned long arg)
2225 {
2226 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2227 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2228 unsigned int h;
2229
2230 if (!netif_running(vxlan->dev))
2231 return;
2232
2233 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2234 struct hlist_node *p, *n;
2235
2236 spin_lock_bh(&vxlan->hash_lock);
2237 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2238 struct vxlan_fdb *f
2239 = container_of(p, struct vxlan_fdb, hlist);
2240 unsigned long timeout;
2241
2242 if (f->state & NUD_PERMANENT)
2243 continue;
2244
2245 timeout = f->used + vxlan->cfg.age_interval * HZ;
2246 if (time_before_eq(timeout, jiffies)) {
2247 netdev_dbg(vxlan->dev,
2248 "garbage collect %pM\n",
2249 f->eth_addr);
2250 f->state = NUD_STALE;
2251 vxlan_fdb_destroy(vxlan, f);
2252 } else if (time_before(timeout, next_timer))
2253 next_timer = timeout;
2254 }
2255 spin_unlock_bh(&vxlan->hash_lock);
2256 }
2257
2258 mod_timer(&vxlan->age_timer, next_timer);
2259 }
2260
2261 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2262 {
2263 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2264 __be32 vni = vxlan->default_dst.remote_vni;
2265
2266 spin_lock(&vn->sock_lock);
2267 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2268 spin_unlock(&vn->sock_lock);
2269 }
2270
2271 /* Setup stats when device is created */
2272 static int vxlan_init(struct net_device *dev)
2273 {
2274 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2275 if (!dev->tstats)
2276 return -ENOMEM;
2277
2278 return 0;
2279 }
2280
2281 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2282 {
2283 struct vxlan_fdb *f;
2284
2285 spin_lock_bh(&vxlan->hash_lock);
2286 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2287 if (f)
2288 vxlan_fdb_destroy(vxlan, f);
2289 spin_unlock_bh(&vxlan->hash_lock);
2290 }
2291
2292 static void vxlan_uninit(struct net_device *dev)
2293 {
2294 struct vxlan_dev *vxlan = netdev_priv(dev);
2295
2296 vxlan_fdb_delete_default(vxlan);
2297
2298 free_percpu(dev->tstats);
2299 }
2300
2301 /* Start ageing timer and join group when device is brought up */
2302 static int vxlan_open(struct net_device *dev)
2303 {
2304 struct vxlan_dev *vxlan = netdev_priv(dev);
2305 int ret;
2306
2307 ret = vxlan_sock_add(vxlan);
2308 if (ret < 0)
2309 return ret;
2310
2311 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2312 ret = vxlan_igmp_join(vxlan);
2313 if (ret == -EADDRINUSE)
2314 ret = 0;
2315 if (ret) {
2316 vxlan_sock_release(vxlan);
2317 return ret;
2318 }
2319 }
2320
2321 if (vxlan->cfg.age_interval)
2322 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2323
2324 return ret;
2325 }
2326
2327 /* Purge the forwarding table */
2328 static void vxlan_flush(struct vxlan_dev *vxlan)
2329 {
2330 unsigned int h;
2331
2332 spin_lock_bh(&vxlan->hash_lock);
2333 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2334 struct hlist_node *p, *n;
2335 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2336 struct vxlan_fdb *f
2337 = container_of(p, struct vxlan_fdb, hlist);
2338 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2339 if (!is_zero_ether_addr(f->eth_addr))
2340 vxlan_fdb_destroy(vxlan, f);
2341 }
2342 }
2343 spin_unlock_bh(&vxlan->hash_lock);
2344 }
2345
2346 /* Cleanup timer and forwarding table on shutdown */
2347 static int vxlan_stop(struct net_device *dev)
2348 {
2349 struct vxlan_dev *vxlan = netdev_priv(dev);
2350 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2351 int ret = 0;
2352
2353 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2354 !vxlan_group_used(vn, vxlan))
2355 ret = vxlan_igmp_leave(vxlan);
2356
2357 del_timer_sync(&vxlan->age_timer);
2358
2359 vxlan_flush(vxlan);
2360 vxlan_sock_release(vxlan);
2361
2362 return ret;
2363 }
2364
2365 /* Stub, nothing needs to be done. */
2366 static void vxlan_set_multicast_list(struct net_device *dev)
2367 {
2368 }
2369
2370 static int __vxlan_change_mtu(struct net_device *dev,
2371 struct net_device *lowerdev,
2372 struct vxlan_rdst *dst, int new_mtu, bool strict)
2373 {
2374 int max_mtu = IP_MAX_MTU;
2375
2376 if (lowerdev)
2377 max_mtu = lowerdev->mtu;
2378
2379 if (dst->remote_ip.sa.sa_family == AF_INET6)
2380 max_mtu -= VXLAN6_HEADROOM;
2381 else
2382 max_mtu -= VXLAN_HEADROOM;
2383
2384 if (new_mtu < 68)
2385 return -EINVAL;
2386
2387 if (new_mtu > max_mtu) {
2388 if (strict)
2389 return -EINVAL;
2390
2391 new_mtu = max_mtu;
2392 }
2393
2394 dev->mtu = new_mtu;
2395 return 0;
2396 }
2397
2398 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2399 {
2400 struct vxlan_dev *vxlan = netdev_priv(dev);
2401 struct vxlan_rdst *dst = &vxlan->default_dst;
2402 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2403 dst->remote_ifindex);
2404 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2405 }
2406
2407 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2408 {
2409 struct vxlan_dev *vxlan = netdev_priv(dev);
2410 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2411 __be16 sport, dport;
2412
2413 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2414 vxlan->cfg.port_max, true);
2415 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2416
2417 if (ip_tunnel_info_af(info) == AF_INET) {
2418 struct rtable *rt;
2419
2420 if (!vxlan->vn4_sock)
2421 return -EINVAL;
2422 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2423 info->key.u.ipv4.dst,
2424 &info->key.u.ipv4.src, NULL, info);
2425 if (IS_ERR(rt))
2426 return PTR_ERR(rt);
2427 ip_rt_put(rt);
2428 } else {
2429 #if IS_ENABLED(CONFIG_IPV6)
2430 struct dst_entry *ndst;
2431
2432 if (!vxlan->vn6_sock)
2433 return -EINVAL;
2434 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2435 info->key.label, &info->key.u.ipv6.dst,
2436 &info->key.u.ipv6.src, NULL, info);
2437 if (IS_ERR(ndst))
2438 return PTR_ERR(ndst);
2439 dst_release(ndst);
2440 #else /* !CONFIG_IPV6 */
2441 return -EPFNOSUPPORT;
2442 #endif
2443 }
2444 info->key.tp_src = sport;
2445 info->key.tp_dst = dport;
2446 return 0;
2447 }
2448
2449 static const struct net_device_ops vxlan_netdev_ether_ops = {
2450 .ndo_init = vxlan_init,
2451 .ndo_uninit = vxlan_uninit,
2452 .ndo_open = vxlan_open,
2453 .ndo_stop = vxlan_stop,
2454 .ndo_start_xmit = vxlan_xmit,
2455 .ndo_get_stats64 = ip_tunnel_get_stats64,
2456 .ndo_set_rx_mode = vxlan_set_multicast_list,
2457 .ndo_change_mtu = vxlan_change_mtu,
2458 .ndo_validate_addr = eth_validate_addr,
2459 .ndo_set_mac_address = eth_mac_addr,
2460 .ndo_fdb_add = vxlan_fdb_add,
2461 .ndo_fdb_del = vxlan_fdb_delete,
2462 .ndo_fdb_dump = vxlan_fdb_dump,
2463 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2464 };
2465
2466 static const struct net_device_ops vxlan_netdev_raw_ops = {
2467 .ndo_init = vxlan_init,
2468 .ndo_uninit = vxlan_uninit,
2469 .ndo_open = vxlan_open,
2470 .ndo_stop = vxlan_stop,
2471 .ndo_start_xmit = vxlan_xmit,
2472 .ndo_get_stats64 = ip_tunnel_get_stats64,
2473 .ndo_change_mtu = vxlan_change_mtu,
2474 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2475 };
2476
2477 /* Info for udev, that this is a virtual tunnel endpoint */
2478 static struct device_type vxlan_type = {
2479 .name = "vxlan",
2480 };
2481
2482 /* Calls the ndo_udp_tunnel_add of the caller in order to
2483 * supply the listening VXLAN udp ports. Callers are expected
2484 * to implement the ndo_udp_tunnel_add.
2485 */
2486 static void vxlan_push_rx_ports(struct net_device *dev)
2487 {
2488 struct vxlan_sock *vs;
2489 struct net *net = dev_net(dev);
2490 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2491 unsigned int i;
2492
2493 spin_lock(&vn->sock_lock);
2494 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2495 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2496 udp_tunnel_push_rx_port(dev, vs->sock,
2497 (vs->flags & VXLAN_F_GPE) ?
2498 UDP_TUNNEL_TYPE_VXLAN_GPE :
2499 UDP_TUNNEL_TYPE_VXLAN);
2500 }
2501 spin_unlock(&vn->sock_lock);
2502 }
2503
2504 /* Initialize the device structure. */
2505 static void vxlan_setup(struct net_device *dev)
2506 {
2507 struct vxlan_dev *vxlan = netdev_priv(dev);
2508 unsigned int h;
2509
2510 eth_hw_addr_random(dev);
2511 ether_setup(dev);
2512
2513 dev->destructor = free_netdev;
2514 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2515
2516 dev->features |= NETIF_F_LLTX;
2517 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2518 dev->features |= NETIF_F_RXCSUM;
2519 dev->features |= NETIF_F_GSO_SOFTWARE;
2520
2521 dev->vlan_features = dev->features;
2522 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2523 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2524 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2525 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2526 netif_keep_dst(dev);
2527 dev->priv_flags |= IFF_NO_QUEUE;
2528
2529 INIT_LIST_HEAD(&vxlan->next);
2530 spin_lock_init(&vxlan->hash_lock);
2531
2532 init_timer_deferrable(&vxlan->age_timer);
2533 vxlan->age_timer.function = vxlan_cleanup;
2534 vxlan->age_timer.data = (unsigned long) vxlan;
2535
2536 vxlan->cfg.dst_port = htons(vxlan_port);
2537
2538 vxlan->dev = dev;
2539
2540 gro_cells_init(&vxlan->gro_cells, dev);
2541
2542 for (h = 0; h < FDB_HASH_SIZE; ++h)
2543 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2544 }
2545
2546 static void vxlan_ether_setup(struct net_device *dev)
2547 {
2548 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2549 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2550 dev->netdev_ops = &vxlan_netdev_ether_ops;
2551 }
2552
2553 static void vxlan_raw_setup(struct net_device *dev)
2554 {
2555 dev->header_ops = NULL;
2556 dev->type = ARPHRD_NONE;
2557 dev->hard_header_len = 0;
2558 dev->addr_len = 0;
2559 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2560 dev->netdev_ops = &vxlan_netdev_raw_ops;
2561 }
2562
2563 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2564 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2565 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2566 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2567 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2568 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2569 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2570 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2571 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2572 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2573 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2574 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2575 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2576 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2577 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2578 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2579 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2580 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2581 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2582 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2583 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2584 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2585 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2586 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2587 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2588 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2589 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2590 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2591 };
2592
2593 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2594 {
2595 if (tb[IFLA_ADDRESS]) {
2596 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2597 pr_debug("invalid link address (not ethernet)\n");
2598 return -EINVAL;
2599 }
2600
2601 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2602 pr_debug("invalid all zero ethernet address\n");
2603 return -EADDRNOTAVAIL;
2604 }
2605 }
2606
2607 if (!data)
2608 return -EINVAL;
2609
2610 if (data[IFLA_VXLAN_ID]) {
2611 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2612 if (id >= VXLAN_VID_MASK)
2613 return -ERANGE;
2614 }
2615
2616 if (data[IFLA_VXLAN_PORT_RANGE]) {
2617 const struct ifla_vxlan_port_range *p
2618 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2619
2620 if (ntohs(p->high) < ntohs(p->low)) {
2621 pr_debug("port range %u .. %u not valid\n",
2622 ntohs(p->low), ntohs(p->high));
2623 return -EINVAL;
2624 }
2625 }
2626
2627 return 0;
2628 }
2629
2630 static void vxlan_get_drvinfo(struct net_device *netdev,
2631 struct ethtool_drvinfo *drvinfo)
2632 {
2633 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2634 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2635 }
2636
2637 static const struct ethtool_ops vxlan_ethtool_ops = {
2638 .get_drvinfo = vxlan_get_drvinfo,
2639 .get_link = ethtool_op_get_link,
2640 };
2641
2642 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2643 __be16 port, u32 flags)
2644 {
2645 struct socket *sock;
2646 struct udp_port_cfg udp_conf;
2647 int err;
2648
2649 memset(&udp_conf, 0, sizeof(udp_conf));
2650
2651 if (ipv6) {
2652 udp_conf.family = AF_INET6;
2653 udp_conf.use_udp6_rx_checksums =
2654 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2655 udp_conf.ipv6_v6only = 1;
2656 } else {
2657 udp_conf.family = AF_INET;
2658 }
2659
2660 udp_conf.local_udp_port = port;
2661
2662 /* Open UDP socket */
2663 err = udp_sock_create(net, &udp_conf, &sock);
2664 if (err < 0)
2665 return ERR_PTR(err);
2666
2667 return sock;
2668 }
2669
2670 /* Create new listen socket if needed */
2671 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2672 __be16 port, u32 flags)
2673 {
2674 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2675 struct vxlan_sock *vs;
2676 struct socket *sock;
2677 unsigned int h;
2678 struct udp_tunnel_sock_cfg tunnel_cfg;
2679
2680 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2681 if (!vs)
2682 return ERR_PTR(-ENOMEM);
2683
2684 for (h = 0; h < VNI_HASH_SIZE; ++h)
2685 INIT_HLIST_HEAD(&vs->vni_list[h]);
2686
2687 sock = vxlan_create_sock(net, ipv6, port, flags);
2688 if (IS_ERR(sock)) {
2689 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2690 PTR_ERR(sock));
2691 kfree(vs);
2692 return ERR_CAST(sock);
2693 }
2694
2695 vs->sock = sock;
2696 atomic_set(&vs->refcnt, 1);
2697 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2698
2699 spin_lock(&vn->sock_lock);
2700 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2701 udp_tunnel_notify_add_rx_port(sock,
2702 (vs->flags & VXLAN_F_GPE) ?
2703 UDP_TUNNEL_TYPE_VXLAN_GPE :
2704 UDP_TUNNEL_TYPE_VXLAN);
2705 spin_unlock(&vn->sock_lock);
2706
2707 /* Mark socket as an encapsulation socket. */
2708 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2709 tunnel_cfg.sk_user_data = vs;
2710 tunnel_cfg.encap_type = 1;
2711 tunnel_cfg.encap_rcv = vxlan_rcv;
2712 tunnel_cfg.encap_destroy = NULL;
2713 tunnel_cfg.gro_receive = vxlan_gro_receive;
2714 tunnel_cfg.gro_complete = vxlan_gro_complete;
2715
2716 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2717
2718 return vs;
2719 }
2720
2721 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2722 {
2723 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2724 struct vxlan_sock *vs = NULL;
2725
2726 if (!vxlan->cfg.no_share) {
2727 spin_lock(&vn->sock_lock);
2728 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2729 vxlan->cfg.dst_port, vxlan->flags);
2730 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2731 spin_unlock(&vn->sock_lock);
2732 return -EBUSY;
2733 }
2734 spin_unlock(&vn->sock_lock);
2735 }
2736 if (!vs)
2737 vs = vxlan_socket_create(vxlan->net, ipv6,
2738 vxlan->cfg.dst_port, vxlan->flags);
2739 if (IS_ERR(vs))
2740 return PTR_ERR(vs);
2741 #if IS_ENABLED(CONFIG_IPV6)
2742 if (ipv6)
2743 vxlan->vn6_sock = vs;
2744 else
2745 #endif
2746 vxlan->vn4_sock = vs;
2747 vxlan_vs_add_dev(vs, vxlan);
2748 return 0;
2749 }
2750
2751 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2752 {
2753 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2754 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2755 int ret = 0;
2756
2757 vxlan->vn4_sock = NULL;
2758 #if IS_ENABLED(CONFIG_IPV6)
2759 vxlan->vn6_sock = NULL;
2760 if (ipv6 || metadata)
2761 ret = __vxlan_sock_add(vxlan, true);
2762 #endif
2763 if (!ret && (!ipv6 || metadata))
2764 ret = __vxlan_sock_add(vxlan, false);
2765 if (ret < 0)
2766 vxlan_sock_release(vxlan);
2767 return ret;
2768 }
2769
2770 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2771 struct vxlan_config *conf)
2772 {
2773 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2774 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2775 struct vxlan_rdst *dst = &vxlan->default_dst;
2776 unsigned short needed_headroom = ETH_HLEN;
2777 int err;
2778 bool use_ipv6 = false;
2779 __be16 default_port = vxlan->cfg.dst_port;
2780 struct net_device *lowerdev = NULL;
2781
2782 if (conf->flags & VXLAN_F_GPE) {
2783 /* For now, allow GPE only together with COLLECT_METADATA.
2784 * This can be relaxed later; in such case, the other side
2785 * of the PtP link will have to be provided.
2786 */
2787 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2788 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2789 pr_info("unsupported combination of extensions\n");
2790 return -EINVAL;
2791 }
2792
2793 vxlan_raw_setup(dev);
2794 } else {
2795 vxlan_ether_setup(dev);
2796 }
2797
2798 vxlan->net = src_net;
2799
2800 dst->remote_vni = conf->vni;
2801
2802 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2803
2804 /* Unless IPv6 is explicitly requested, assume IPv4 */
2805 if (!dst->remote_ip.sa.sa_family)
2806 dst->remote_ip.sa.sa_family = AF_INET;
2807
2808 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2809 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2810 if (!IS_ENABLED(CONFIG_IPV6))
2811 return -EPFNOSUPPORT;
2812 use_ipv6 = true;
2813 vxlan->flags |= VXLAN_F_IPV6;
2814 }
2815
2816 if (conf->label && !use_ipv6) {
2817 pr_info("label only supported in use with IPv6\n");
2818 return -EINVAL;
2819 }
2820
2821 if (conf->remote_ifindex) {
2822 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2823 dst->remote_ifindex = conf->remote_ifindex;
2824
2825 if (!lowerdev) {
2826 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2827 return -ENODEV;
2828 }
2829
2830 #if IS_ENABLED(CONFIG_IPV6)
2831 if (use_ipv6) {
2832 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2833 if (idev && idev->cnf.disable_ipv6) {
2834 pr_info("IPv6 is disabled via sysctl\n");
2835 return -EPERM;
2836 }
2837 }
2838 #endif
2839
2840 if (!conf->mtu)
2841 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2842
2843 needed_headroom = lowerdev->hard_header_len;
2844 } else if (vxlan_addr_multicast(&dst->remote_ip)) {
2845 pr_info("multicast destination requires interface to be specified\n");
2846 return -EINVAL;
2847 }
2848
2849 if (conf->mtu) {
2850 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2851 if (err)
2852 return err;
2853 }
2854
2855 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2856 needed_headroom += VXLAN6_HEADROOM;
2857 else
2858 needed_headroom += VXLAN_HEADROOM;
2859 dev->needed_headroom = needed_headroom;
2860
2861 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2862 if (!vxlan->cfg.dst_port) {
2863 if (conf->flags & VXLAN_F_GPE)
2864 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2865 else
2866 vxlan->cfg.dst_port = default_port;
2867 }
2868 vxlan->flags |= conf->flags;
2869
2870 if (!vxlan->cfg.age_interval)
2871 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2872
2873 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2874 if (tmp->cfg.vni == conf->vni &&
2875 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2876 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2877 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2878 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2879 (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
2880 pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
2881 return -EEXIST;
2882 }
2883 }
2884
2885 dev->ethtool_ops = &vxlan_ethtool_ops;
2886
2887 /* create an fdb entry for a valid default destination */
2888 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2889 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2890 &vxlan->default_dst.remote_ip,
2891 NUD_REACHABLE|NUD_PERMANENT,
2892 NLM_F_EXCL|NLM_F_CREATE,
2893 vxlan->cfg.dst_port,
2894 vxlan->default_dst.remote_vni,
2895 vxlan->default_dst.remote_ifindex,
2896 NTF_SELF);
2897 if (err)
2898 return err;
2899 }
2900
2901 err = register_netdevice(dev);
2902 if (err) {
2903 vxlan_fdb_delete_default(vxlan);
2904 return err;
2905 }
2906
2907 list_add(&vxlan->next, &vn->vxlan_list);
2908
2909 return 0;
2910 }
2911
2912 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2913 struct nlattr *tb[], struct nlattr *data[])
2914 {
2915 struct vxlan_config conf;
2916
2917 memset(&conf, 0, sizeof(conf));
2918
2919 if (data[IFLA_VXLAN_ID])
2920 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2921
2922 if (data[IFLA_VXLAN_GROUP]) {
2923 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2924 } else if (data[IFLA_VXLAN_GROUP6]) {
2925 if (!IS_ENABLED(CONFIG_IPV6))
2926 return -EPFNOSUPPORT;
2927
2928 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2929 conf.remote_ip.sa.sa_family = AF_INET6;
2930 }
2931
2932 if (data[IFLA_VXLAN_LOCAL]) {
2933 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2934 conf.saddr.sa.sa_family = AF_INET;
2935 } else if (data[IFLA_VXLAN_LOCAL6]) {
2936 if (!IS_ENABLED(CONFIG_IPV6))
2937 return -EPFNOSUPPORT;
2938
2939 /* TODO: respect scope id */
2940 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2941 conf.saddr.sa.sa_family = AF_INET6;
2942 }
2943
2944 if (data[IFLA_VXLAN_LINK])
2945 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2946
2947 if (data[IFLA_VXLAN_TOS])
2948 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2949
2950 if (data[IFLA_VXLAN_TTL])
2951 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2952
2953 if (data[IFLA_VXLAN_LABEL])
2954 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2955 IPV6_FLOWLABEL_MASK;
2956
2957 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2958 conf.flags |= VXLAN_F_LEARN;
2959
2960 if (data[IFLA_VXLAN_AGEING])
2961 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2962
2963 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2964 conf.flags |= VXLAN_F_PROXY;
2965
2966 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2967 conf.flags |= VXLAN_F_RSC;
2968
2969 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2970 conf.flags |= VXLAN_F_L2MISS;
2971
2972 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2973 conf.flags |= VXLAN_F_L3MISS;
2974
2975 if (data[IFLA_VXLAN_LIMIT])
2976 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2977
2978 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2979 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2980 conf.flags |= VXLAN_F_COLLECT_METADATA;
2981
2982 if (data[IFLA_VXLAN_PORT_RANGE]) {
2983 const struct ifla_vxlan_port_range *p
2984 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2985 conf.port_min = ntohs(p->low);
2986 conf.port_max = ntohs(p->high);
2987 }
2988
2989 if (data[IFLA_VXLAN_PORT])
2990 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2991
2992 if (data[IFLA_VXLAN_UDP_CSUM] &&
2993 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2994 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2995
2996 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2997 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2998 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2999
3000 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3001 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3002 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3003
3004 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3005 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3006 conf.flags |= VXLAN_F_REMCSUM_TX;
3007
3008 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3009 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3010 conf.flags |= VXLAN_F_REMCSUM_RX;
3011
3012 if (data[IFLA_VXLAN_GBP])
3013 conf.flags |= VXLAN_F_GBP;
3014
3015 if (data[IFLA_VXLAN_GPE])
3016 conf.flags |= VXLAN_F_GPE;
3017
3018 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3019 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3020
3021 if (tb[IFLA_MTU])
3022 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3023
3024 return vxlan_dev_configure(src_net, dev, &conf);
3025 }
3026
3027 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3028 {
3029 struct vxlan_dev *vxlan = netdev_priv(dev);
3030 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3031
3032 spin_lock(&vn->sock_lock);
3033 if (!hlist_unhashed(&vxlan->hlist))
3034 hlist_del_rcu(&vxlan->hlist);
3035 spin_unlock(&vn->sock_lock);
3036
3037 gro_cells_destroy(&vxlan->gro_cells);
3038 list_del(&vxlan->next);
3039 unregister_netdevice_queue(dev, head);
3040 }
3041
3042 static size_t vxlan_get_size(const struct net_device *dev)
3043 {
3044
3045 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3046 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3047 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3048 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3049 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3050 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3051 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3052 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3053 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3054 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3055 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3056 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3057 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3058 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3059 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3060 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3061 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3062 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3063 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3064 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3065 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3066 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3067 0;
3068 }
3069
3070 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3071 {
3072 const struct vxlan_dev *vxlan = netdev_priv(dev);
3073 const struct vxlan_rdst *dst = &vxlan->default_dst;
3074 struct ifla_vxlan_port_range ports = {
3075 .low = htons(vxlan->cfg.port_min),
3076 .high = htons(vxlan->cfg.port_max),
3077 };
3078
3079 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3080 goto nla_put_failure;
3081
3082 if (!vxlan_addr_any(&dst->remote_ip)) {
3083 if (dst->remote_ip.sa.sa_family == AF_INET) {
3084 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3085 dst->remote_ip.sin.sin_addr.s_addr))
3086 goto nla_put_failure;
3087 #if IS_ENABLED(CONFIG_IPV6)
3088 } else {
3089 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3090 &dst->remote_ip.sin6.sin6_addr))
3091 goto nla_put_failure;
3092 #endif
3093 }
3094 }
3095
3096 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3097 goto nla_put_failure;
3098
3099 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3100 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3101 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3102 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3103 goto nla_put_failure;
3104 #if IS_ENABLED(CONFIG_IPV6)
3105 } else {
3106 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3107 &vxlan->cfg.saddr.sin6.sin6_addr))
3108 goto nla_put_failure;
3109 #endif
3110 }
3111 }
3112
3113 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3114 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3115 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3116 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3117 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3118 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3119 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3120 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3121 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3122 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3123 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3124 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3125 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3126 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3127 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3128 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3129 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3130 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3131 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3132 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3133 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3134 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3135 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3136 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3137 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3138 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3139 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3140 goto nla_put_failure;
3141
3142 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3143 goto nla_put_failure;
3144
3145 if (vxlan->flags & VXLAN_F_GBP &&
3146 nla_put_flag(skb, IFLA_VXLAN_GBP))
3147 goto nla_put_failure;
3148
3149 if (vxlan->flags & VXLAN_F_GPE &&
3150 nla_put_flag(skb, IFLA_VXLAN_GPE))
3151 goto nla_put_failure;
3152
3153 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3154 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3155 goto nla_put_failure;
3156
3157 return 0;
3158
3159 nla_put_failure:
3160 return -EMSGSIZE;
3161 }
3162
3163 static struct net *vxlan_get_link_net(const struct net_device *dev)
3164 {
3165 struct vxlan_dev *vxlan = netdev_priv(dev);
3166
3167 return vxlan->net;
3168 }
3169
3170 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3171 .kind = "vxlan",
3172 .maxtype = IFLA_VXLAN_MAX,
3173 .policy = vxlan_policy,
3174 .priv_size = sizeof(struct vxlan_dev),
3175 .setup = vxlan_setup,
3176 .validate = vxlan_validate,
3177 .newlink = vxlan_newlink,
3178 .dellink = vxlan_dellink,
3179 .get_size = vxlan_get_size,
3180 .fill_info = vxlan_fill_info,
3181 .get_link_net = vxlan_get_link_net,
3182 };
3183
3184 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3185 u8 name_assign_type,
3186 struct vxlan_config *conf)
3187 {
3188 struct nlattr *tb[IFLA_MAX + 1];
3189 struct net_device *dev;
3190 int err;
3191
3192 memset(&tb, 0, sizeof(tb));
3193
3194 dev = rtnl_create_link(net, name, name_assign_type,
3195 &vxlan_link_ops, tb);
3196 if (IS_ERR(dev))
3197 return dev;
3198
3199 err = vxlan_dev_configure(net, dev, conf);
3200 if (err < 0) {
3201 free_netdev(dev);
3202 return ERR_PTR(err);
3203 }
3204
3205 err = rtnl_configure_link(dev, NULL);
3206 if (err < 0) {
3207 LIST_HEAD(list_kill);
3208
3209 vxlan_dellink(dev, &list_kill);
3210 unregister_netdevice_many(&list_kill);
3211 return ERR_PTR(err);
3212 }
3213
3214 return dev;
3215 }
3216 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3217
3218 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3219 struct net_device *dev)
3220 {
3221 struct vxlan_dev *vxlan, *next;
3222 LIST_HEAD(list_kill);
3223
3224 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3225 struct vxlan_rdst *dst = &vxlan->default_dst;
3226
3227 /* In case we created vxlan device with carrier
3228 * and we loose the carrier due to module unload
3229 * we also need to remove vxlan device. In other
3230 * cases, it's not necessary and remote_ifindex
3231 * is 0 here, so no matches.
3232 */
3233 if (dst->remote_ifindex == dev->ifindex)
3234 vxlan_dellink(vxlan->dev, &list_kill);
3235 }
3236
3237 unregister_netdevice_many(&list_kill);
3238 }
3239
3240 static int vxlan_netdevice_event(struct notifier_block *unused,
3241 unsigned long event, void *ptr)
3242 {
3243 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3244 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3245
3246 if (event == NETDEV_UNREGISTER)
3247 vxlan_handle_lowerdev_unregister(vn, dev);
3248 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3249 vxlan_push_rx_ports(dev);
3250
3251 return NOTIFY_DONE;
3252 }
3253
3254 static struct notifier_block vxlan_notifier_block __read_mostly = {
3255 .notifier_call = vxlan_netdevice_event,
3256 };
3257
3258 static __net_init int vxlan_init_net(struct net *net)
3259 {
3260 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3261 unsigned int h;
3262
3263 INIT_LIST_HEAD(&vn->vxlan_list);
3264 spin_lock_init(&vn->sock_lock);
3265
3266 for (h = 0; h < PORT_HASH_SIZE; ++h)
3267 INIT_HLIST_HEAD(&vn->sock_list[h]);
3268
3269 return 0;
3270 }
3271
3272 static void __net_exit vxlan_exit_net(struct net *net)
3273 {
3274 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3275 struct vxlan_dev *vxlan, *next;
3276 struct net_device *dev, *aux;
3277 LIST_HEAD(list);
3278
3279 rtnl_lock();
3280 for_each_netdev_safe(net, dev, aux)
3281 if (dev->rtnl_link_ops == &vxlan_link_ops)
3282 unregister_netdevice_queue(dev, &list);
3283
3284 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3285 /* If vxlan->dev is in the same netns, it has already been added
3286 * to the list by the previous loop.
3287 */
3288 if (!net_eq(dev_net(vxlan->dev), net)) {
3289 gro_cells_destroy(&vxlan->gro_cells);
3290 unregister_netdevice_queue(vxlan->dev, &list);
3291 }
3292 }
3293
3294 unregister_netdevice_many(&list);
3295 rtnl_unlock();
3296 }
3297
3298 static struct pernet_operations vxlan_net_ops = {
3299 .init = vxlan_init_net,
3300 .exit = vxlan_exit_net,
3301 .id = &vxlan_net_id,
3302 .size = sizeof(struct vxlan_net),
3303 };
3304
3305 static int __init vxlan_init_module(void)
3306 {
3307 int rc;
3308
3309 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3310
3311 rc = register_pernet_subsys(&vxlan_net_ops);
3312 if (rc)
3313 goto out1;
3314
3315 rc = register_netdevice_notifier(&vxlan_notifier_block);
3316 if (rc)
3317 goto out2;
3318
3319 rc = rtnl_link_register(&vxlan_link_ops);
3320 if (rc)
3321 goto out3;
3322
3323 return 0;
3324 out3:
3325 unregister_netdevice_notifier(&vxlan_notifier_block);
3326 out2:
3327 unregister_pernet_subsys(&vxlan_net_ops);
3328 out1:
3329 return rc;
3330 }
3331 late_initcall(vxlan_init_module);
3332
3333 static void __exit vxlan_cleanup_module(void)
3334 {
3335 rtnl_link_unregister(&vxlan_link_ops);
3336 unregister_netdevice_notifier(&vxlan_notifier_block);
3337 unregister_pernet_subsys(&vxlan_net_ops);
3338 /* rcu_barrier() is called by netns */
3339 }
3340 module_exit(vxlan_cleanup_module);
3341
3342 MODULE_LICENSE("GPL");
3343 MODULE_VERSION(VXLAN_VERSION);
3344 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3345 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3346 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support