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Merge tag 'tpmdd-next-20160902' into next
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/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 #include <net/protocol.h>
31
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <net/ip6_tunnel.h>
34 #include <net/ip6_checksum.h>
35 #endif
36
37 #define VXLAN_VERSION "0.1"
38
39 #define PORT_HASH_BITS 8
40 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41 #define FDB_AGE_DEFAULT 300 /* 5 min */
42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44 /* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48 static unsigned short vxlan_port __read_mostly = 8472;
49 module_param_named(udp_port, vxlan_port, ushort, 0444);
50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52 static bool log_ecn_error = true;
53 module_param(log_ecn_error, bool, 0644);
54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56 static int vxlan_net_id;
57 static struct rtnl_link_ops vxlan_link_ops;
58
59 static const u8 all_zeros_mac[ETH_ALEN + 2];
60
61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63 /* per-network namespace private data for this module */
64 struct vxlan_net {
65 struct list_head vxlan_list;
66 struct hlist_head sock_list[PORT_HASH_SIZE];
67 spinlock_t sock_lock;
68 };
69
70 /* Forwarding table entry */
71 struct vxlan_fdb {
72 struct hlist_node hlist; /* linked list of entries */
73 struct rcu_head rcu;
74 unsigned long updated; /* jiffies */
75 unsigned long used;
76 struct list_head remotes;
77 u8 eth_addr[ETH_ALEN];
78 u16 state; /* see ndm_state */
79 u8 flags; /* see ndm_flags */
80 };
81
82 /* salt for hash table */
83 static u32 vxlan_salt __read_mostly;
84
85 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
86 {
87 return vs->flags & VXLAN_F_COLLECT_METADATA ||
88 ip_tunnel_collect_metadata();
89 }
90
91 #if IS_ENABLED(CONFIG_IPV6)
92 static inline
93 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
94 {
95 if (a->sa.sa_family != b->sa.sa_family)
96 return false;
97 if (a->sa.sa_family == AF_INET6)
98 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
99 else
100 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
101 }
102
103 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
104 {
105 if (ipa->sa.sa_family == AF_INET6)
106 return ipv6_addr_any(&ipa->sin6.sin6_addr);
107 else
108 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
109 }
110
111 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
112 {
113 if (ipa->sa.sa_family == AF_INET6)
114 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
115 else
116 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
117 }
118
119 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
120 {
121 if (nla_len(nla) >= sizeof(struct in6_addr)) {
122 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
123 ip->sa.sa_family = AF_INET6;
124 return 0;
125 } else if (nla_len(nla) >= sizeof(__be32)) {
126 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
127 ip->sa.sa_family = AF_INET;
128 return 0;
129 } else {
130 return -EAFNOSUPPORT;
131 }
132 }
133
134 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
135 const union vxlan_addr *ip)
136 {
137 if (ip->sa.sa_family == AF_INET6)
138 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
139 else
140 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
141 }
142
143 #else /* !CONFIG_IPV6 */
144
145 static inline
146 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
147 {
148 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
149 }
150
151 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
152 {
153 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
154 }
155
156 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
157 {
158 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
159 }
160
161 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
162 {
163 if (nla_len(nla) >= sizeof(struct in6_addr)) {
164 return -EAFNOSUPPORT;
165 } else if (nla_len(nla) >= sizeof(__be32)) {
166 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
167 ip->sa.sa_family = AF_INET;
168 return 0;
169 } else {
170 return -EAFNOSUPPORT;
171 }
172 }
173
174 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
175 const union vxlan_addr *ip)
176 {
177 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
178 }
179 #endif
180
181 /* Virtual Network hash table head */
182 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
183 {
184 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
185 }
186
187 /* Socket hash table head */
188 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
189 {
190 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
191
192 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
193 }
194
195 /* First remote destination for a forwarding entry.
196 * Guaranteed to be non-NULL because remotes are never deleted.
197 */
198 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
199 {
200 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
201 }
202
203 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
204 {
205 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
206 }
207
208 /* Find VXLAN socket based on network namespace, address family and UDP port
209 * and enabled unshareable flags.
210 */
211 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
212 __be16 port, u32 flags)
213 {
214 struct vxlan_sock *vs;
215
216 flags &= VXLAN_F_RCV_FLAGS;
217
218 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
219 if (inet_sk(vs->sock->sk)->inet_sport == port &&
220 vxlan_get_sk_family(vs) == family &&
221 vs->flags == flags)
222 return vs;
223 }
224 return NULL;
225 }
226
227 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
228 {
229 struct vxlan_dev *vxlan;
230
231 /* For flow based devices, map all packets to VNI 0 */
232 if (vs->flags & VXLAN_F_COLLECT_METADATA)
233 vni = 0;
234
235 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
236 if (vxlan->default_dst.remote_vni == vni)
237 return vxlan;
238 }
239
240 return NULL;
241 }
242
243 /* Look up VNI in a per net namespace table */
244 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
245 sa_family_t family, __be16 port,
246 u32 flags)
247 {
248 struct vxlan_sock *vs;
249
250 vs = vxlan_find_sock(net, family, port, flags);
251 if (!vs)
252 return NULL;
253
254 return vxlan_vs_find_vni(vs, vni);
255 }
256
257 /* Fill in neighbour message in skbuff. */
258 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
259 const struct vxlan_fdb *fdb,
260 u32 portid, u32 seq, int type, unsigned int flags,
261 const struct vxlan_rdst *rdst)
262 {
263 unsigned long now = jiffies;
264 struct nda_cacheinfo ci;
265 struct nlmsghdr *nlh;
266 struct ndmsg *ndm;
267 bool send_ip, send_eth;
268
269 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
270 if (nlh == NULL)
271 return -EMSGSIZE;
272
273 ndm = nlmsg_data(nlh);
274 memset(ndm, 0, sizeof(*ndm));
275
276 send_eth = send_ip = true;
277
278 if (type == RTM_GETNEIGH) {
279 ndm->ndm_family = AF_INET;
280 send_ip = !vxlan_addr_any(&rdst->remote_ip);
281 send_eth = !is_zero_ether_addr(fdb->eth_addr);
282 } else
283 ndm->ndm_family = AF_BRIDGE;
284 ndm->ndm_state = fdb->state;
285 ndm->ndm_ifindex = vxlan->dev->ifindex;
286 ndm->ndm_flags = fdb->flags;
287 ndm->ndm_type = RTN_UNICAST;
288
289 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
290 nla_put_s32(skb, NDA_LINK_NETNSID,
291 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
292 goto nla_put_failure;
293
294 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
295 goto nla_put_failure;
296
297 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
298 goto nla_put_failure;
299
300 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
301 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
302 goto nla_put_failure;
303 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
304 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
305 goto nla_put_failure;
306 if (rdst->remote_ifindex &&
307 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
308 goto nla_put_failure;
309
310 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
311 ci.ndm_confirmed = 0;
312 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
313 ci.ndm_refcnt = 0;
314
315 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
316 goto nla_put_failure;
317
318 nlmsg_end(skb, nlh);
319 return 0;
320
321 nla_put_failure:
322 nlmsg_cancel(skb, nlh);
323 return -EMSGSIZE;
324 }
325
326 static inline size_t vxlan_nlmsg_size(void)
327 {
328 return NLMSG_ALIGN(sizeof(struct ndmsg))
329 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
330 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
331 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
332 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
333 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
334 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
335 + nla_total_size(sizeof(struct nda_cacheinfo));
336 }
337
338 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
339 struct vxlan_rdst *rd, int type)
340 {
341 struct net *net = dev_net(vxlan->dev);
342 struct sk_buff *skb;
343 int err = -ENOBUFS;
344
345 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
346 if (skb == NULL)
347 goto errout;
348
349 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
350 if (err < 0) {
351 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
352 WARN_ON(err == -EMSGSIZE);
353 kfree_skb(skb);
354 goto errout;
355 }
356
357 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
358 return;
359 errout:
360 if (err < 0)
361 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
362 }
363
364 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
365 {
366 struct vxlan_dev *vxlan = netdev_priv(dev);
367 struct vxlan_fdb f = {
368 .state = NUD_STALE,
369 };
370 struct vxlan_rdst remote = {
371 .remote_ip = *ipa, /* goes to NDA_DST */
372 .remote_vni = cpu_to_be32(VXLAN_N_VID),
373 };
374
375 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
376 }
377
378 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
379 {
380 struct vxlan_fdb f = {
381 .state = NUD_STALE,
382 };
383 struct vxlan_rdst remote = { };
384
385 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
386
387 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
388 }
389
390 /* Hash Ethernet address */
391 static u32 eth_hash(const unsigned char *addr)
392 {
393 u64 value = get_unaligned((u64 *)addr);
394
395 /* only want 6 bytes */
396 #ifdef __BIG_ENDIAN
397 value >>= 16;
398 #else
399 value <<= 16;
400 #endif
401 return hash_64(value, FDB_HASH_BITS);
402 }
403
404 /* Hash chain to use given mac address */
405 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
406 const u8 *mac)
407 {
408 return &vxlan->fdb_head[eth_hash(mac)];
409 }
410
411 /* Look up Ethernet address in forwarding table */
412 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
413 const u8 *mac)
414 {
415 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
416 struct vxlan_fdb *f;
417
418 hlist_for_each_entry_rcu(f, head, hlist) {
419 if (ether_addr_equal(mac, f->eth_addr))
420 return f;
421 }
422
423 return NULL;
424 }
425
426 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
427 const u8 *mac)
428 {
429 struct vxlan_fdb *f;
430
431 f = __vxlan_find_mac(vxlan, mac);
432 if (f)
433 f->used = jiffies;
434
435 return f;
436 }
437
438 /* caller should hold vxlan->hash_lock */
439 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
440 union vxlan_addr *ip, __be16 port,
441 __be32 vni, __u32 ifindex)
442 {
443 struct vxlan_rdst *rd;
444
445 list_for_each_entry(rd, &f->remotes, list) {
446 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
447 rd->remote_port == port &&
448 rd->remote_vni == vni &&
449 rd->remote_ifindex == ifindex)
450 return rd;
451 }
452
453 return NULL;
454 }
455
456 /* Replace destination of unicast mac */
457 static int vxlan_fdb_replace(struct vxlan_fdb *f,
458 union vxlan_addr *ip, __be16 port, __be32 vni,
459 __u32 ifindex)
460 {
461 struct vxlan_rdst *rd;
462
463 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
464 if (rd)
465 return 0;
466
467 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
468 if (!rd)
469 return 0;
470
471 dst_cache_reset(&rd->dst_cache);
472 rd->remote_ip = *ip;
473 rd->remote_port = port;
474 rd->remote_vni = vni;
475 rd->remote_ifindex = ifindex;
476 return 1;
477 }
478
479 /* Add/update destinations for multicast */
480 static int vxlan_fdb_append(struct vxlan_fdb *f,
481 union vxlan_addr *ip, __be16 port, __be32 vni,
482 __u32 ifindex, struct vxlan_rdst **rdp)
483 {
484 struct vxlan_rdst *rd;
485
486 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
487 if (rd)
488 return 0;
489
490 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
491 if (rd == NULL)
492 return -ENOBUFS;
493
494 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
495 kfree(rd);
496 return -ENOBUFS;
497 }
498
499 rd->remote_ip = *ip;
500 rd->remote_port = port;
501 rd->remote_vni = vni;
502 rd->remote_ifindex = ifindex;
503
504 list_add_tail_rcu(&rd->list, &f->remotes);
505
506 *rdp = rd;
507 return 1;
508 }
509
510 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
511 unsigned int off,
512 struct vxlanhdr *vh, size_t hdrlen,
513 __be32 vni_field,
514 struct gro_remcsum *grc,
515 bool nopartial)
516 {
517 size_t start, offset;
518
519 if (skb->remcsum_offload)
520 return vh;
521
522 if (!NAPI_GRO_CB(skb)->csum_valid)
523 return NULL;
524
525 start = vxlan_rco_start(vni_field);
526 offset = start + vxlan_rco_offset(vni_field);
527
528 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
529 start, offset, grc, nopartial);
530
531 skb->remcsum_offload = 1;
532
533 return vh;
534 }
535
536 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
537 struct sk_buff **head,
538 struct sk_buff *skb)
539 {
540 struct sk_buff *p, **pp = NULL;
541 struct vxlanhdr *vh, *vh2;
542 unsigned int hlen, off_vx;
543 int flush = 1;
544 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
545 __be32 flags;
546 struct gro_remcsum grc;
547
548 skb_gro_remcsum_init(&grc);
549
550 off_vx = skb_gro_offset(skb);
551 hlen = off_vx + sizeof(*vh);
552 vh = skb_gro_header_fast(skb, off_vx);
553 if (skb_gro_header_hard(skb, hlen)) {
554 vh = skb_gro_header_slow(skb, hlen, off_vx);
555 if (unlikely(!vh))
556 goto out;
557 }
558
559 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
560
561 flags = vh->vx_flags;
562
563 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
564 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
565 vh->vx_vni, &grc,
566 !!(vs->flags &
567 VXLAN_F_REMCSUM_NOPARTIAL));
568
569 if (!vh)
570 goto out;
571 }
572
573 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
574
575 for (p = *head; p; p = p->next) {
576 if (!NAPI_GRO_CB(p)->same_flow)
577 continue;
578
579 vh2 = (struct vxlanhdr *)(p->data + off_vx);
580 if (vh->vx_flags != vh2->vx_flags ||
581 vh->vx_vni != vh2->vx_vni) {
582 NAPI_GRO_CB(p)->same_flow = 0;
583 continue;
584 }
585 }
586
587 pp = eth_gro_receive(head, skb);
588 flush = 0;
589
590 out:
591 skb_gro_remcsum_cleanup(skb, &grc);
592 NAPI_GRO_CB(skb)->flush |= flush;
593
594 return pp;
595 }
596
597 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
598 {
599 /* Sets 'skb->inner_mac_header' since we are always called with
600 * 'skb->encapsulation' set.
601 */
602 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
603 }
604
605 /* Add new entry to forwarding table -- assumes lock held */
606 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
607 const u8 *mac, union vxlan_addr *ip,
608 __u16 state, __u16 flags,
609 __be16 port, __be32 vni, __u32 ifindex,
610 __u8 ndm_flags)
611 {
612 struct vxlan_rdst *rd = NULL;
613 struct vxlan_fdb *f;
614 int notify = 0;
615
616 f = __vxlan_find_mac(vxlan, mac);
617 if (f) {
618 if (flags & NLM_F_EXCL) {
619 netdev_dbg(vxlan->dev,
620 "lost race to create %pM\n", mac);
621 return -EEXIST;
622 }
623 if (f->state != state) {
624 f->state = state;
625 f->updated = jiffies;
626 notify = 1;
627 }
628 if (f->flags != ndm_flags) {
629 f->flags = ndm_flags;
630 f->updated = jiffies;
631 notify = 1;
632 }
633 if ((flags & NLM_F_REPLACE)) {
634 /* Only change unicasts */
635 if (!(is_multicast_ether_addr(f->eth_addr) ||
636 is_zero_ether_addr(f->eth_addr))) {
637 notify |= vxlan_fdb_replace(f, ip, port, vni,
638 ifindex);
639 } else
640 return -EOPNOTSUPP;
641 }
642 if ((flags & NLM_F_APPEND) &&
643 (is_multicast_ether_addr(f->eth_addr) ||
644 is_zero_ether_addr(f->eth_addr))) {
645 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
646 &rd);
647
648 if (rc < 0)
649 return rc;
650 notify |= rc;
651 }
652 } else {
653 if (!(flags & NLM_F_CREATE))
654 return -ENOENT;
655
656 if (vxlan->cfg.addrmax &&
657 vxlan->addrcnt >= vxlan->cfg.addrmax)
658 return -ENOSPC;
659
660 /* Disallow replace to add a multicast entry */
661 if ((flags & NLM_F_REPLACE) &&
662 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
663 return -EOPNOTSUPP;
664
665 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
666 f = kmalloc(sizeof(*f), GFP_ATOMIC);
667 if (!f)
668 return -ENOMEM;
669
670 notify = 1;
671 f->state = state;
672 f->flags = ndm_flags;
673 f->updated = f->used = jiffies;
674 INIT_LIST_HEAD(&f->remotes);
675 memcpy(f->eth_addr, mac, ETH_ALEN);
676
677 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
678
679 ++vxlan->addrcnt;
680 hlist_add_head_rcu(&f->hlist,
681 vxlan_fdb_head(vxlan, mac));
682 }
683
684 if (notify) {
685 if (rd == NULL)
686 rd = first_remote_rtnl(f);
687 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
688 }
689
690 return 0;
691 }
692
693 static void vxlan_fdb_free(struct rcu_head *head)
694 {
695 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
696 struct vxlan_rdst *rd, *nd;
697
698 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
699 dst_cache_destroy(&rd->dst_cache);
700 kfree(rd);
701 }
702 kfree(f);
703 }
704
705 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
706 {
707 netdev_dbg(vxlan->dev,
708 "delete %pM\n", f->eth_addr);
709
710 --vxlan->addrcnt;
711 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
712
713 hlist_del_rcu(&f->hlist);
714 call_rcu(&f->rcu, vxlan_fdb_free);
715 }
716
717 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
718 union vxlan_addr *ip, __be16 *port, __be32 *vni,
719 u32 *ifindex)
720 {
721 struct net *net = dev_net(vxlan->dev);
722 int err;
723
724 if (tb[NDA_DST]) {
725 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
726 if (err)
727 return err;
728 } else {
729 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
730 if (remote->sa.sa_family == AF_INET) {
731 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
732 ip->sa.sa_family = AF_INET;
733 #if IS_ENABLED(CONFIG_IPV6)
734 } else {
735 ip->sin6.sin6_addr = in6addr_any;
736 ip->sa.sa_family = AF_INET6;
737 #endif
738 }
739 }
740
741 if (tb[NDA_PORT]) {
742 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
743 return -EINVAL;
744 *port = nla_get_be16(tb[NDA_PORT]);
745 } else {
746 *port = vxlan->cfg.dst_port;
747 }
748
749 if (tb[NDA_VNI]) {
750 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
751 return -EINVAL;
752 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
753 } else {
754 *vni = vxlan->default_dst.remote_vni;
755 }
756
757 if (tb[NDA_IFINDEX]) {
758 struct net_device *tdev;
759
760 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
761 return -EINVAL;
762 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
763 tdev = __dev_get_by_index(net, *ifindex);
764 if (!tdev)
765 return -EADDRNOTAVAIL;
766 } else {
767 *ifindex = 0;
768 }
769
770 return 0;
771 }
772
773 /* Add static entry (via netlink) */
774 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
775 struct net_device *dev,
776 const unsigned char *addr, u16 vid, u16 flags)
777 {
778 struct vxlan_dev *vxlan = netdev_priv(dev);
779 /* struct net *net = dev_net(vxlan->dev); */
780 union vxlan_addr ip;
781 __be16 port;
782 __be32 vni;
783 u32 ifindex;
784 int err;
785
786 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
787 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
788 ndm->ndm_state);
789 return -EINVAL;
790 }
791
792 if (tb[NDA_DST] == NULL)
793 return -EINVAL;
794
795 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
796 if (err)
797 return err;
798
799 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
800 return -EAFNOSUPPORT;
801
802 spin_lock_bh(&vxlan->hash_lock);
803 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
804 port, vni, ifindex, ndm->ndm_flags);
805 spin_unlock_bh(&vxlan->hash_lock);
806
807 return err;
808 }
809
810 /* Delete entry (via netlink) */
811 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
812 struct net_device *dev,
813 const unsigned char *addr, u16 vid)
814 {
815 struct vxlan_dev *vxlan = netdev_priv(dev);
816 struct vxlan_fdb *f;
817 struct vxlan_rdst *rd = NULL;
818 union vxlan_addr ip;
819 __be16 port;
820 __be32 vni;
821 u32 ifindex;
822 int err;
823
824 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
825 if (err)
826 return err;
827
828 err = -ENOENT;
829
830 spin_lock_bh(&vxlan->hash_lock);
831 f = vxlan_find_mac(vxlan, addr);
832 if (!f)
833 goto out;
834
835 if (!vxlan_addr_any(&ip)) {
836 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
837 if (!rd)
838 goto out;
839 }
840
841 err = 0;
842
843 /* remove a destination if it's not the only one on the list,
844 * otherwise destroy the fdb entry
845 */
846 if (rd && !list_is_singular(&f->remotes)) {
847 list_del_rcu(&rd->list);
848 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
849 kfree_rcu(rd, rcu);
850 goto out;
851 }
852
853 vxlan_fdb_destroy(vxlan, f);
854
855 out:
856 spin_unlock_bh(&vxlan->hash_lock);
857
858 return err;
859 }
860
861 /* Dump forwarding table */
862 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
863 struct net_device *dev,
864 struct net_device *filter_dev, int idx)
865 {
866 struct vxlan_dev *vxlan = netdev_priv(dev);
867 unsigned int h;
868
869 for (h = 0; h < FDB_HASH_SIZE; ++h) {
870 struct vxlan_fdb *f;
871 int err;
872
873 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
874 struct vxlan_rdst *rd;
875
876 list_for_each_entry_rcu(rd, &f->remotes, list) {
877 if (idx < cb->args[0])
878 goto skip;
879
880 err = vxlan_fdb_info(skb, vxlan, f,
881 NETLINK_CB(cb->skb).portid,
882 cb->nlh->nlmsg_seq,
883 RTM_NEWNEIGH,
884 NLM_F_MULTI, rd);
885 if (err < 0) {
886 cb->args[1] = err;
887 goto out;
888 }
889 skip:
890 ++idx;
891 }
892 }
893 }
894 out:
895 return idx;
896 }
897
898 /* Watch incoming packets to learn mapping between Ethernet address
899 * and Tunnel endpoint.
900 * Return true if packet is bogus and should be dropped.
901 */
902 static bool vxlan_snoop(struct net_device *dev,
903 union vxlan_addr *src_ip, const u8 *src_mac)
904 {
905 struct vxlan_dev *vxlan = netdev_priv(dev);
906 struct vxlan_fdb *f;
907
908 f = vxlan_find_mac(vxlan, src_mac);
909 if (likely(f)) {
910 struct vxlan_rdst *rdst = first_remote_rcu(f);
911
912 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
913 return false;
914
915 /* Don't migrate static entries, drop packets */
916 if (f->state & NUD_NOARP)
917 return true;
918
919 if (net_ratelimit())
920 netdev_info(dev,
921 "%pM migrated from %pIS to %pIS\n",
922 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
923
924 rdst->remote_ip = *src_ip;
925 f->updated = jiffies;
926 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
927 } else {
928 /* learned new entry */
929 spin_lock(&vxlan->hash_lock);
930
931 /* close off race between vxlan_flush and incoming packets */
932 if (netif_running(dev))
933 vxlan_fdb_create(vxlan, src_mac, src_ip,
934 NUD_REACHABLE,
935 NLM_F_EXCL|NLM_F_CREATE,
936 vxlan->cfg.dst_port,
937 vxlan->default_dst.remote_vni,
938 0, NTF_SELF);
939 spin_unlock(&vxlan->hash_lock);
940 }
941
942 return false;
943 }
944
945 /* See if multicast group is already in use by other ID */
946 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
947 {
948 struct vxlan_dev *vxlan;
949 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
950
951 /* The vxlan_sock is only used by dev, leaving group has
952 * no effect on other vxlan devices.
953 */
954 if (family == AF_INET && dev->vn4_sock &&
955 atomic_read(&dev->vn4_sock->refcnt) == 1)
956 return false;
957 #if IS_ENABLED(CONFIG_IPV6)
958 if (family == AF_INET6 && dev->vn6_sock &&
959 atomic_read(&dev->vn6_sock->refcnt) == 1)
960 return false;
961 #endif
962
963 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
964 if (!netif_running(vxlan->dev) || vxlan == dev)
965 continue;
966
967 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
968 continue;
969 #if IS_ENABLED(CONFIG_IPV6)
970 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
971 continue;
972 #endif
973
974 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
975 &dev->default_dst.remote_ip))
976 continue;
977
978 if (vxlan->default_dst.remote_ifindex !=
979 dev->default_dst.remote_ifindex)
980 continue;
981
982 return true;
983 }
984
985 return false;
986 }
987
988 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
989 {
990 struct vxlan_net *vn;
991
992 if (!vs)
993 return false;
994 if (!atomic_dec_and_test(&vs->refcnt))
995 return false;
996
997 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
998 spin_lock(&vn->sock_lock);
999 hlist_del_rcu(&vs->hlist);
1000 udp_tunnel_notify_del_rx_port(vs->sock,
1001 (vs->flags & VXLAN_F_GPE) ?
1002 UDP_TUNNEL_TYPE_VXLAN_GPE :
1003 UDP_TUNNEL_TYPE_VXLAN);
1004 spin_unlock(&vn->sock_lock);
1005
1006 return true;
1007 }
1008
1009 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1010 {
1011 bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock);
1012 #if IS_ENABLED(CONFIG_IPV6)
1013 bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock);
1014 #endif
1015
1016 synchronize_net();
1017
1018 if (ipv4) {
1019 udp_tunnel_sock_release(vxlan->vn4_sock->sock);
1020 kfree(vxlan->vn4_sock);
1021 }
1022
1023 #if IS_ENABLED(CONFIG_IPV6)
1024 if (ipv6) {
1025 udp_tunnel_sock_release(vxlan->vn6_sock->sock);
1026 kfree(vxlan->vn6_sock);
1027 }
1028 #endif
1029 }
1030
1031 /* Update multicast group membership when first VNI on
1032 * multicast address is brought up
1033 */
1034 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1035 {
1036 struct sock *sk;
1037 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1038 int ifindex = vxlan->default_dst.remote_ifindex;
1039 int ret = -EINVAL;
1040
1041 if (ip->sa.sa_family == AF_INET) {
1042 struct ip_mreqn mreq = {
1043 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1044 .imr_ifindex = ifindex,
1045 };
1046
1047 sk = vxlan->vn4_sock->sock->sk;
1048 lock_sock(sk);
1049 ret = ip_mc_join_group(sk, &mreq);
1050 release_sock(sk);
1051 #if IS_ENABLED(CONFIG_IPV6)
1052 } else {
1053 sk = vxlan->vn6_sock->sock->sk;
1054 lock_sock(sk);
1055 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1056 &ip->sin6.sin6_addr);
1057 release_sock(sk);
1058 #endif
1059 }
1060
1061 return ret;
1062 }
1063
1064 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1065 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1066 {
1067 struct sock *sk;
1068 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1069 int ifindex = vxlan->default_dst.remote_ifindex;
1070 int ret = -EINVAL;
1071
1072 if (ip->sa.sa_family == AF_INET) {
1073 struct ip_mreqn mreq = {
1074 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1075 .imr_ifindex = ifindex,
1076 };
1077
1078 sk = vxlan->vn4_sock->sock->sk;
1079 lock_sock(sk);
1080 ret = ip_mc_leave_group(sk, &mreq);
1081 release_sock(sk);
1082 #if IS_ENABLED(CONFIG_IPV6)
1083 } else {
1084 sk = vxlan->vn6_sock->sock->sk;
1085 lock_sock(sk);
1086 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1087 &ip->sin6.sin6_addr);
1088 release_sock(sk);
1089 #endif
1090 }
1091
1092 return ret;
1093 }
1094
1095 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1096 struct sk_buff *skb, u32 vxflags)
1097 {
1098 size_t start, offset;
1099
1100 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1101 goto out;
1102
1103 start = vxlan_rco_start(unparsed->vx_vni);
1104 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1105
1106 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1107 return false;
1108
1109 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1110 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1111 out:
1112 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1113 unparsed->vx_vni &= VXLAN_VNI_MASK;
1114 return true;
1115 }
1116
1117 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1118 struct sk_buff *skb, u32 vxflags,
1119 struct vxlan_metadata *md)
1120 {
1121 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1122 struct metadata_dst *tun_dst;
1123
1124 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1125 goto out;
1126
1127 md->gbp = ntohs(gbp->policy_id);
1128
1129 tun_dst = (struct metadata_dst *)skb_dst(skb);
1130 if (tun_dst) {
1131 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1132 tun_dst->u.tun_info.options_len = sizeof(*md);
1133 }
1134 if (gbp->dont_learn)
1135 md->gbp |= VXLAN_GBP_DONT_LEARN;
1136
1137 if (gbp->policy_applied)
1138 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1139
1140 /* In flow-based mode, GBP is carried in dst_metadata */
1141 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1142 skb->mark = md->gbp;
1143 out:
1144 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1145 }
1146
1147 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1148 __be16 *protocol,
1149 struct sk_buff *skb, u32 vxflags)
1150 {
1151 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1152
1153 /* Need to have Next Protocol set for interfaces in GPE mode. */
1154 if (!gpe->np_applied)
1155 return false;
1156 /* "The initial version is 0. If a receiver does not support the
1157 * version indicated it MUST drop the packet.
1158 */
1159 if (gpe->version != 0)
1160 return false;
1161 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1162 * processing MUST occur." However, we don't implement OAM
1163 * processing, thus drop the packet.
1164 */
1165 if (gpe->oam_flag)
1166 return false;
1167
1168 switch (gpe->next_protocol) {
1169 case VXLAN_GPE_NP_IPV4:
1170 *protocol = htons(ETH_P_IP);
1171 break;
1172 case VXLAN_GPE_NP_IPV6:
1173 *protocol = htons(ETH_P_IPV6);
1174 break;
1175 case VXLAN_GPE_NP_ETHERNET:
1176 *protocol = htons(ETH_P_TEB);
1177 break;
1178 default:
1179 return false;
1180 }
1181
1182 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1183 return true;
1184 }
1185
1186 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1187 struct vxlan_sock *vs,
1188 struct sk_buff *skb)
1189 {
1190 union vxlan_addr saddr;
1191
1192 skb_reset_mac_header(skb);
1193 skb->protocol = eth_type_trans(skb, vxlan->dev);
1194 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1195
1196 /* Ignore packet loops (and multicast echo) */
1197 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1198 return false;
1199
1200 /* Get address from the outer IP header */
1201 if (vxlan_get_sk_family(vs) == AF_INET) {
1202 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1203 saddr.sa.sa_family = AF_INET;
1204 #if IS_ENABLED(CONFIG_IPV6)
1205 } else {
1206 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1207 saddr.sa.sa_family = AF_INET6;
1208 #endif
1209 }
1210
1211 if ((vxlan->flags & VXLAN_F_LEARN) &&
1212 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1213 return false;
1214
1215 return true;
1216 }
1217
1218 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1219 struct sk_buff *skb)
1220 {
1221 int err = 0;
1222
1223 if (vxlan_get_sk_family(vs) == AF_INET)
1224 err = IP_ECN_decapsulate(oiph, skb);
1225 #if IS_ENABLED(CONFIG_IPV6)
1226 else
1227 err = IP6_ECN_decapsulate(oiph, skb);
1228 #endif
1229
1230 if (unlikely(err) && log_ecn_error) {
1231 if (vxlan_get_sk_family(vs) == AF_INET)
1232 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1233 &((struct iphdr *)oiph)->saddr,
1234 ((struct iphdr *)oiph)->tos);
1235 else
1236 net_info_ratelimited("non-ECT from %pI6\n",
1237 &((struct ipv6hdr *)oiph)->saddr);
1238 }
1239 return err <= 1;
1240 }
1241
1242 /* Callback from net/ipv4/udp.c to receive packets */
1243 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1244 {
1245 struct pcpu_sw_netstats *stats;
1246 struct vxlan_dev *vxlan;
1247 struct vxlan_sock *vs;
1248 struct vxlanhdr unparsed;
1249 struct vxlan_metadata _md;
1250 struct vxlan_metadata *md = &_md;
1251 __be16 protocol = htons(ETH_P_TEB);
1252 bool raw_proto = false;
1253 void *oiph;
1254
1255 /* Need UDP and VXLAN header to be present */
1256 if (!pskb_may_pull(skb, VXLAN_HLEN))
1257 goto drop;
1258
1259 unparsed = *vxlan_hdr(skb);
1260 /* VNI flag always required to be set */
1261 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1262 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1263 ntohl(vxlan_hdr(skb)->vx_flags),
1264 ntohl(vxlan_hdr(skb)->vx_vni));
1265 /* Return non vxlan pkt */
1266 goto drop;
1267 }
1268 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1269 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1270
1271 vs = rcu_dereference_sk_user_data(sk);
1272 if (!vs)
1273 goto drop;
1274
1275 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1276 if (!vxlan)
1277 goto drop;
1278
1279 /* For backwards compatibility, only allow reserved fields to be
1280 * used by VXLAN extensions if explicitly requested.
1281 */
1282 if (vs->flags & VXLAN_F_GPE) {
1283 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1284 goto drop;
1285 raw_proto = true;
1286 }
1287
1288 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1289 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1290 goto drop;
1291
1292 if (vxlan_collect_metadata(vs)) {
1293 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1294 struct metadata_dst *tun_dst;
1295
1296 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1297 vxlan_vni_to_tun_id(vni), sizeof(*md));
1298
1299 if (!tun_dst)
1300 goto drop;
1301
1302 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1303
1304 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1305 } else {
1306 memset(md, 0, sizeof(*md));
1307 }
1308
1309 if (vs->flags & VXLAN_F_REMCSUM_RX)
1310 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1311 goto drop;
1312 if (vs->flags & VXLAN_F_GBP)
1313 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1314 /* Note that GBP and GPE can never be active together. This is
1315 * ensured in vxlan_dev_configure.
1316 */
1317
1318 if (unparsed.vx_flags || unparsed.vx_vni) {
1319 /* If there are any unprocessed flags remaining treat
1320 * this as a malformed packet. This behavior diverges from
1321 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1322 * in reserved fields are to be ignored. The approach here
1323 * maintains compatibility with previous stack code, and also
1324 * is more robust and provides a little more security in
1325 * adding extensions to VXLAN.
1326 */
1327 goto drop;
1328 }
1329
1330 if (!raw_proto) {
1331 if (!vxlan_set_mac(vxlan, vs, skb))
1332 goto drop;
1333 } else {
1334 skb_reset_mac_header(skb);
1335 skb->dev = vxlan->dev;
1336 skb->pkt_type = PACKET_HOST;
1337 }
1338
1339 oiph = skb_network_header(skb);
1340 skb_reset_network_header(skb);
1341
1342 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1343 ++vxlan->dev->stats.rx_frame_errors;
1344 ++vxlan->dev->stats.rx_errors;
1345 goto drop;
1346 }
1347
1348 stats = this_cpu_ptr(vxlan->dev->tstats);
1349 u64_stats_update_begin(&stats->syncp);
1350 stats->rx_packets++;
1351 stats->rx_bytes += skb->len;
1352 u64_stats_update_end(&stats->syncp);
1353
1354 gro_cells_receive(&vxlan->gro_cells, skb);
1355 return 0;
1356
1357 drop:
1358 /* Consume bad packet */
1359 kfree_skb(skb);
1360 return 0;
1361 }
1362
1363 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1364 {
1365 struct vxlan_dev *vxlan = netdev_priv(dev);
1366 struct arphdr *parp;
1367 u8 *arpptr, *sha;
1368 __be32 sip, tip;
1369 struct neighbour *n;
1370
1371 if (dev->flags & IFF_NOARP)
1372 goto out;
1373
1374 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1375 dev->stats.tx_dropped++;
1376 goto out;
1377 }
1378 parp = arp_hdr(skb);
1379
1380 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1381 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1382 parp->ar_pro != htons(ETH_P_IP) ||
1383 parp->ar_op != htons(ARPOP_REQUEST) ||
1384 parp->ar_hln != dev->addr_len ||
1385 parp->ar_pln != 4)
1386 goto out;
1387 arpptr = (u8 *)parp + sizeof(struct arphdr);
1388 sha = arpptr;
1389 arpptr += dev->addr_len; /* sha */
1390 memcpy(&sip, arpptr, sizeof(sip));
1391 arpptr += sizeof(sip);
1392 arpptr += dev->addr_len; /* tha */
1393 memcpy(&tip, arpptr, sizeof(tip));
1394
1395 if (ipv4_is_loopback(tip) ||
1396 ipv4_is_multicast(tip))
1397 goto out;
1398
1399 n = neigh_lookup(&arp_tbl, &tip, dev);
1400
1401 if (n) {
1402 struct vxlan_fdb *f;
1403 struct sk_buff *reply;
1404
1405 if (!(n->nud_state & NUD_CONNECTED)) {
1406 neigh_release(n);
1407 goto out;
1408 }
1409
1410 f = vxlan_find_mac(vxlan, n->ha);
1411 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1412 /* bridge-local neighbor */
1413 neigh_release(n);
1414 goto out;
1415 }
1416
1417 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1418 n->ha, sha);
1419
1420 neigh_release(n);
1421
1422 if (reply == NULL)
1423 goto out;
1424
1425 skb_reset_mac_header(reply);
1426 __skb_pull(reply, skb_network_offset(reply));
1427 reply->ip_summed = CHECKSUM_UNNECESSARY;
1428 reply->pkt_type = PACKET_HOST;
1429
1430 if (netif_rx_ni(reply) == NET_RX_DROP)
1431 dev->stats.rx_dropped++;
1432 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1433 union vxlan_addr ipa = {
1434 .sin.sin_addr.s_addr = tip,
1435 .sin.sin_family = AF_INET,
1436 };
1437
1438 vxlan_ip_miss(dev, &ipa);
1439 }
1440 out:
1441 consume_skb(skb);
1442 return NETDEV_TX_OK;
1443 }
1444
1445 #if IS_ENABLED(CONFIG_IPV6)
1446 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1447 struct neighbour *n, bool isrouter)
1448 {
1449 struct net_device *dev = request->dev;
1450 struct sk_buff *reply;
1451 struct nd_msg *ns, *na;
1452 struct ipv6hdr *pip6;
1453 u8 *daddr;
1454 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1455 int ns_olen;
1456 int i, len;
1457
1458 if (dev == NULL)
1459 return NULL;
1460
1461 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1462 sizeof(*na) + na_olen + dev->needed_tailroom;
1463 reply = alloc_skb(len, GFP_ATOMIC);
1464 if (reply == NULL)
1465 return NULL;
1466
1467 reply->protocol = htons(ETH_P_IPV6);
1468 reply->dev = dev;
1469 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1470 skb_push(reply, sizeof(struct ethhdr));
1471 skb_reset_mac_header(reply);
1472
1473 ns = (struct nd_msg *)skb_transport_header(request);
1474
1475 daddr = eth_hdr(request)->h_source;
1476 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1477 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1478 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1479 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1480 break;
1481 }
1482 }
1483
1484 /* Ethernet header */
1485 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1486 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1487 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1488 reply->protocol = htons(ETH_P_IPV6);
1489
1490 skb_pull(reply, sizeof(struct ethhdr));
1491 skb_reset_network_header(reply);
1492 skb_put(reply, sizeof(struct ipv6hdr));
1493
1494 /* IPv6 header */
1495
1496 pip6 = ipv6_hdr(reply);
1497 memset(pip6, 0, sizeof(struct ipv6hdr));
1498 pip6->version = 6;
1499 pip6->priority = ipv6_hdr(request)->priority;
1500 pip6->nexthdr = IPPROTO_ICMPV6;
1501 pip6->hop_limit = 255;
1502 pip6->daddr = ipv6_hdr(request)->saddr;
1503 pip6->saddr = *(struct in6_addr *)n->primary_key;
1504
1505 skb_pull(reply, sizeof(struct ipv6hdr));
1506 skb_reset_transport_header(reply);
1507
1508 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1509
1510 /* Neighbor Advertisement */
1511 memset(na, 0, sizeof(*na)+na_olen);
1512 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1513 na->icmph.icmp6_router = isrouter;
1514 na->icmph.icmp6_override = 1;
1515 na->icmph.icmp6_solicited = 1;
1516 na->target = ns->target;
1517 ether_addr_copy(&na->opt[2], n->ha);
1518 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1519 na->opt[1] = na_olen >> 3;
1520
1521 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1522 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1523 csum_partial(na, sizeof(*na)+na_olen, 0));
1524
1525 pip6->payload_len = htons(sizeof(*na)+na_olen);
1526
1527 skb_push(reply, sizeof(struct ipv6hdr));
1528
1529 reply->ip_summed = CHECKSUM_UNNECESSARY;
1530
1531 return reply;
1532 }
1533
1534 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1535 {
1536 struct vxlan_dev *vxlan = netdev_priv(dev);
1537 struct nd_msg *msg;
1538 const struct ipv6hdr *iphdr;
1539 const struct in6_addr *saddr, *daddr;
1540 struct neighbour *n;
1541 struct inet6_dev *in6_dev;
1542
1543 in6_dev = __in6_dev_get(dev);
1544 if (!in6_dev)
1545 goto out;
1546
1547 iphdr = ipv6_hdr(skb);
1548 saddr = &iphdr->saddr;
1549 daddr = &iphdr->daddr;
1550
1551 msg = (struct nd_msg *)skb_transport_header(skb);
1552 if (msg->icmph.icmp6_code != 0 ||
1553 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1554 goto out;
1555
1556 if (ipv6_addr_loopback(daddr) ||
1557 ipv6_addr_is_multicast(&msg->target))
1558 goto out;
1559
1560 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1561
1562 if (n) {
1563 struct vxlan_fdb *f;
1564 struct sk_buff *reply;
1565
1566 if (!(n->nud_state & NUD_CONNECTED)) {
1567 neigh_release(n);
1568 goto out;
1569 }
1570
1571 f = vxlan_find_mac(vxlan, n->ha);
1572 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1573 /* bridge-local neighbor */
1574 neigh_release(n);
1575 goto out;
1576 }
1577
1578 reply = vxlan_na_create(skb, n,
1579 !!(f ? f->flags & NTF_ROUTER : 0));
1580
1581 neigh_release(n);
1582
1583 if (reply == NULL)
1584 goto out;
1585
1586 if (netif_rx_ni(reply) == NET_RX_DROP)
1587 dev->stats.rx_dropped++;
1588
1589 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1590 union vxlan_addr ipa = {
1591 .sin6.sin6_addr = msg->target,
1592 .sin6.sin6_family = AF_INET6,
1593 };
1594
1595 vxlan_ip_miss(dev, &ipa);
1596 }
1597
1598 out:
1599 consume_skb(skb);
1600 return NETDEV_TX_OK;
1601 }
1602 #endif
1603
1604 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1605 {
1606 struct vxlan_dev *vxlan = netdev_priv(dev);
1607 struct neighbour *n;
1608
1609 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1610 return false;
1611
1612 n = NULL;
1613 switch (ntohs(eth_hdr(skb)->h_proto)) {
1614 case ETH_P_IP:
1615 {
1616 struct iphdr *pip;
1617
1618 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1619 return false;
1620 pip = ip_hdr(skb);
1621 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1622 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1623 union vxlan_addr ipa = {
1624 .sin.sin_addr.s_addr = pip->daddr,
1625 .sin.sin_family = AF_INET,
1626 };
1627
1628 vxlan_ip_miss(dev, &ipa);
1629 return false;
1630 }
1631
1632 break;
1633 }
1634 #if IS_ENABLED(CONFIG_IPV6)
1635 case ETH_P_IPV6:
1636 {
1637 struct ipv6hdr *pip6;
1638
1639 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1640 return false;
1641 pip6 = ipv6_hdr(skb);
1642 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1643 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1644 union vxlan_addr ipa = {
1645 .sin6.sin6_addr = pip6->daddr,
1646 .sin6.sin6_family = AF_INET6,
1647 };
1648
1649 vxlan_ip_miss(dev, &ipa);
1650 return false;
1651 }
1652
1653 break;
1654 }
1655 #endif
1656 default:
1657 return false;
1658 }
1659
1660 if (n) {
1661 bool diff;
1662
1663 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1664 if (diff) {
1665 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1666 dev->addr_len);
1667 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1668 }
1669 neigh_release(n);
1670 return diff;
1671 }
1672
1673 return false;
1674 }
1675
1676 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1677 struct vxlan_metadata *md)
1678 {
1679 struct vxlanhdr_gbp *gbp;
1680
1681 if (!md->gbp)
1682 return;
1683
1684 gbp = (struct vxlanhdr_gbp *)vxh;
1685 vxh->vx_flags |= VXLAN_HF_GBP;
1686
1687 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1688 gbp->dont_learn = 1;
1689
1690 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1691 gbp->policy_applied = 1;
1692
1693 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1694 }
1695
1696 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1697 __be16 protocol)
1698 {
1699 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1700
1701 gpe->np_applied = 1;
1702
1703 switch (protocol) {
1704 case htons(ETH_P_IP):
1705 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1706 return 0;
1707 case htons(ETH_P_IPV6):
1708 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1709 return 0;
1710 case htons(ETH_P_TEB):
1711 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1712 return 0;
1713 }
1714 return -EPFNOSUPPORT;
1715 }
1716
1717 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1718 int iphdr_len, __be32 vni,
1719 struct vxlan_metadata *md, u32 vxflags,
1720 bool udp_sum)
1721 {
1722 struct vxlanhdr *vxh;
1723 int min_headroom;
1724 int err;
1725 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1726 __be16 inner_protocol = htons(ETH_P_TEB);
1727
1728 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1729 skb->ip_summed == CHECKSUM_PARTIAL) {
1730 int csum_start = skb_checksum_start_offset(skb);
1731
1732 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1733 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1734 (skb->csum_offset == offsetof(struct udphdr, check) ||
1735 skb->csum_offset == offsetof(struct tcphdr, check)))
1736 type |= SKB_GSO_TUNNEL_REMCSUM;
1737 }
1738
1739 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1740 + VXLAN_HLEN + iphdr_len
1741 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1742
1743 /* Need space for new headers (invalidates iph ptr) */
1744 err = skb_cow_head(skb, min_headroom);
1745 if (unlikely(err))
1746 goto out_free;
1747
1748 skb = vlan_hwaccel_push_inside(skb);
1749 if (WARN_ON(!skb))
1750 return -ENOMEM;
1751
1752 err = iptunnel_handle_offloads(skb, type);
1753 if (err)
1754 goto out_free;
1755
1756 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1757 vxh->vx_flags = VXLAN_HF_VNI;
1758 vxh->vx_vni = vxlan_vni_field(vni);
1759
1760 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1761 unsigned int start;
1762
1763 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1764 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1765 vxh->vx_flags |= VXLAN_HF_RCO;
1766
1767 if (!skb_is_gso(skb)) {
1768 skb->ip_summed = CHECKSUM_NONE;
1769 skb->encapsulation = 0;
1770 }
1771 }
1772
1773 if (vxflags & VXLAN_F_GBP)
1774 vxlan_build_gbp_hdr(vxh, vxflags, md);
1775 if (vxflags & VXLAN_F_GPE) {
1776 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1777 if (err < 0)
1778 goto out_free;
1779 inner_protocol = skb->protocol;
1780 }
1781
1782 skb_set_inner_protocol(skb, inner_protocol);
1783 return 0;
1784
1785 out_free:
1786 kfree_skb(skb);
1787 return err;
1788 }
1789
1790 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1791 struct sk_buff *skb, int oif, u8 tos,
1792 __be32 daddr, __be32 *saddr,
1793 struct dst_cache *dst_cache,
1794 const struct ip_tunnel_info *info)
1795 {
1796 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1797 struct rtable *rt = NULL;
1798 struct flowi4 fl4;
1799
1800 if (tos && !info)
1801 use_cache = false;
1802 if (use_cache) {
1803 rt = dst_cache_get_ip4(dst_cache, saddr);
1804 if (rt)
1805 return rt;
1806 }
1807
1808 memset(&fl4, 0, sizeof(fl4));
1809 fl4.flowi4_oif = oif;
1810 fl4.flowi4_tos = RT_TOS(tos);
1811 fl4.flowi4_mark = skb->mark;
1812 fl4.flowi4_proto = IPPROTO_UDP;
1813 fl4.daddr = daddr;
1814 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1815
1816 rt = ip_route_output_key(vxlan->net, &fl4);
1817 if (!IS_ERR(rt)) {
1818 *saddr = fl4.saddr;
1819 if (use_cache)
1820 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1821 }
1822 return rt;
1823 }
1824
1825 #if IS_ENABLED(CONFIG_IPV6)
1826 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1827 struct sk_buff *skb, int oif, u8 tos,
1828 __be32 label,
1829 const struct in6_addr *daddr,
1830 struct in6_addr *saddr,
1831 struct dst_cache *dst_cache,
1832 const struct ip_tunnel_info *info)
1833 {
1834 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1835 struct dst_entry *ndst;
1836 struct flowi6 fl6;
1837 int err;
1838
1839 if (tos && !info)
1840 use_cache = false;
1841 if (use_cache) {
1842 ndst = dst_cache_get_ip6(dst_cache, saddr);
1843 if (ndst)
1844 return ndst;
1845 }
1846
1847 memset(&fl6, 0, sizeof(fl6));
1848 fl6.flowi6_oif = oif;
1849 fl6.daddr = *daddr;
1850 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1851 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1852 fl6.flowi6_mark = skb->mark;
1853 fl6.flowi6_proto = IPPROTO_UDP;
1854
1855 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1856 vxlan->vn6_sock->sock->sk,
1857 &ndst, &fl6);
1858 if (err < 0)
1859 return ERR_PTR(err);
1860
1861 *saddr = fl6.saddr;
1862 if (use_cache)
1863 dst_cache_set_ip6(dst_cache, ndst, saddr);
1864 return ndst;
1865 }
1866 #endif
1867
1868 /* Bypass encapsulation if the destination is local */
1869 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1870 struct vxlan_dev *dst_vxlan)
1871 {
1872 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1873 union vxlan_addr loopback;
1874 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1875 struct net_device *dev = skb->dev;
1876 int len = skb->len;
1877
1878 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1879 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1880 skb->pkt_type = PACKET_HOST;
1881 skb->encapsulation = 0;
1882 skb->dev = dst_vxlan->dev;
1883 __skb_pull(skb, skb_network_offset(skb));
1884
1885 if (remote_ip->sa.sa_family == AF_INET) {
1886 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1887 loopback.sa.sa_family = AF_INET;
1888 #if IS_ENABLED(CONFIG_IPV6)
1889 } else {
1890 loopback.sin6.sin6_addr = in6addr_loopback;
1891 loopback.sa.sa_family = AF_INET6;
1892 #endif
1893 }
1894
1895 if (dst_vxlan->flags & VXLAN_F_LEARN)
1896 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1897
1898 u64_stats_update_begin(&tx_stats->syncp);
1899 tx_stats->tx_packets++;
1900 tx_stats->tx_bytes += len;
1901 u64_stats_update_end(&tx_stats->syncp);
1902
1903 if (netif_rx(skb) == NET_RX_SUCCESS) {
1904 u64_stats_update_begin(&rx_stats->syncp);
1905 rx_stats->rx_packets++;
1906 rx_stats->rx_bytes += len;
1907 u64_stats_update_end(&rx_stats->syncp);
1908 } else {
1909 dev->stats.rx_dropped++;
1910 }
1911 }
1912
1913 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1914 struct vxlan_rdst *rdst, bool did_rsc)
1915 {
1916 struct dst_cache *dst_cache;
1917 struct ip_tunnel_info *info;
1918 struct vxlan_dev *vxlan = netdev_priv(dev);
1919 struct sock *sk;
1920 struct rtable *rt = NULL;
1921 const struct iphdr *old_iph;
1922 union vxlan_addr *dst;
1923 union vxlan_addr remote_ip;
1924 struct vxlan_metadata _md;
1925 struct vxlan_metadata *md = &_md;
1926 __be16 src_port = 0, dst_port;
1927 __be32 vni, label;
1928 __be16 df = 0;
1929 __u8 tos, ttl;
1930 int err;
1931 u32 flags = vxlan->flags;
1932 bool udp_sum = false;
1933 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1934
1935 info = skb_tunnel_info(skb);
1936
1937 if (rdst) {
1938 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1939 vni = rdst->remote_vni;
1940 dst = &rdst->remote_ip;
1941 dst_cache = &rdst->dst_cache;
1942 } else {
1943 if (!info) {
1944 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1945 dev->name);
1946 goto drop;
1947 }
1948 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1949 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1950 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1951 if (remote_ip.sa.sa_family == AF_INET)
1952 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1953 else
1954 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1955 dst = &remote_ip;
1956 dst_cache = &info->dst_cache;
1957 }
1958
1959 if (vxlan_addr_any(dst)) {
1960 if (did_rsc) {
1961 /* short-circuited back to local bridge */
1962 vxlan_encap_bypass(skb, vxlan, vxlan);
1963 return;
1964 }
1965 goto drop;
1966 }
1967
1968 old_iph = ip_hdr(skb);
1969
1970 ttl = vxlan->cfg.ttl;
1971 if (!ttl && vxlan_addr_multicast(dst))
1972 ttl = 1;
1973
1974 tos = vxlan->cfg.tos;
1975 if (tos == 1)
1976 tos = ip_tunnel_get_dsfield(old_iph, skb);
1977
1978 label = vxlan->cfg.label;
1979 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1980 vxlan->cfg.port_max, true);
1981
1982 if (info) {
1983 ttl = info->key.ttl;
1984 tos = info->key.tos;
1985 label = info->key.label;
1986 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1987
1988 if (info->options_len)
1989 md = ip_tunnel_info_opts(info);
1990 } else {
1991 md->gbp = skb->mark;
1992 }
1993
1994 if (dst->sa.sa_family == AF_INET) {
1995 __be32 saddr;
1996
1997 if (!vxlan->vn4_sock)
1998 goto drop;
1999 sk = vxlan->vn4_sock->sock->sk;
2000
2001 rt = vxlan_get_route(vxlan, skb,
2002 rdst ? rdst->remote_ifindex : 0, tos,
2003 dst->sin.sin_addr.s_addr, &saddr,
2004 dst_cache, info);
2005 if (IS_ERR(rt)) {
2006 netdev_dbg(dev, "no route to %pI4\n",
2007 &dst->sin.sin_addr.s_addr);
2008 dev->stats.tx_carrier_errors++;
2009 goto tx_error;
2010 }
2011
2012 if (rt->dst.dev == dev) {
2013 netdev_dbg(dev, "circular route to %pI4\n",
2014 &dst->sin.sin_addr.s_addr);
2015 dev->stats.collisions++;
2016 goto rt_tx_error;
2017 }
2018
2019 /* Bypass encapsulation if the destination is local */
2020 if (rt->rt_flags & RTCF_LOCAL &&
2021 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2022 struct vxlan_dev *dst_vxlan;
2023
2024 ip_rt_put(rt);
2025 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2026 dst->sa.sa_family, dst_port,
2027 vxlan->flags);
2028 if (!dst_vxlan)
2029 goto tx_error;
2030 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2031 return;
2032 }
2033
2034 if (!info)
2035 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2036 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2037 df = htons(IP_DF);
2038
2039 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2040 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2041 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2042 vni, md, flags, udp_sum);
2043 if (err < 0)
2044 goto xmit_tx_error;
2045
2046 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2047 dst->sin.sin_addr.s_addr, tos, ttl, df,
2048 src_port, dst_port, xnet, !udp_sum);
2049 #if IS_ENABLED(CONFIG_IPV6)
2050 } else {
2051 struct dst_entry *ndst;
2052 struct in6_addr saddr;
2053 u32 rt6i_flags;
2054
2055 if (!vxlan->vn6_sock)
2056 goto drop;
2057 sk = vxlan->vn6_sock->sock->sk;
2058
2059 ndst = vxlan6_get_route(vxlan, skb,
2060 rdst ? rdst->remote_ifindex : 0, tos,
2061 label, &dst->sin6.sin6_addr, &saddr,
2062 dst_cache, info);
2063 if (IS_ERR(ndst)) {
2064 netdev_dbg(dev, "no route to %pI6\n",
2065 &dst->sin6.sin6_addr);
2066 dev->stats.tx_carrier_errors++;
2067 goto tx_error;
2068 }
2069
2070 if (ndst->dev == dev) {
2071 netdev_dbg(dev, "circular route to %pI6\n",
2072 &dst->sin6.sin6_addr);
2073 dst_release(ndst);
2074 dev->stats.collisions++;
2075 goto tx_error;
2076 }
2077
2078 /* Bypass encapsulation if the destination is local */
2079 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2080 if (rt6i_flags & RTF_LOCAL &&
2081 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2082 struct vxlan_dev *dst_vxlan;
2083
2084 dst_release(ndst);
2085 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2086 dst->sa.sa_family, dst_port,
2087 vxlan->flags);
2088 if (!dst_vxlan)
2089 goto tx_error;
2090 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2091 return;
2092 }
2093
2094 if (!info)
2095 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2096
2097 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2098 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2099 skb_scrub_packet(skb, xnet);
2100 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2101 vni, md, flags, udp_sum);
2102 if (err < 0) {
2103 dst_release(ndst);
2104 return;
2105 }
2106 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2107 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2108 label, src_port, dst_port, !udp_sum);
2109 #endif
2110 }
2111
2112 return;
2113
2114 drop:
2115 dev->stats.tx_dropped++;
2116 goto tx_free;
2117
2118 xmit_tx_error:
2119 /* skb is already freed. */
2120 skb = NULL;
2121 rt_tx_error:
2122 ip_rt_put(rt);
2123 tx_error:
2124 dev->stats.tx_errors++;
2125 tx_free:
2126 dev_kfree_skb(skb);
2127 }
2128
2129 /* Transmit local packets over Vxlan
2130 *
2131 * Outer IP header inherits ECN and DF from inner header.
2132 * Outer UDP destination is the VXLAN assigned port.
2133 * source port is based on hash of flow
2134 */
2135 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2136 {
2137 struct vxlan_dev *vxlan = netdev_priv(dev);
2138 const struct ip_tunnel_info *info;
2139 struct ethhdr *eth;
2140 bool did_rsc = false;
2141 struct vxlan_rdst *rdst, *fdst = NULL;
2142 struct vxlan_fdb *f;
2143
2144 info = skb_tunnel_info(skb);
2145
2146 skb_reset_mac_header(skb);
2147
2148 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2149 if (info && info->mode & IP_TUNNEL_INFO_TX)
2150 vxlan_xmit_one(skb, dev, NULL, false);
2151 else
2152 kfree_skb(skb);
2153 return NETDEV_TX_OK;
2154 }
2155
2156 if (vxlan->flags & VXLAN_F_PROXY) {
2157 eth = eth_hdr(skb);
2158 if (ntohs(eth->h_proto) == ETH_P_ARP)
2159 return arp_reduce(dev, skb);
2160 #if IS_ENABLED(CONFIG_IPV6)
2161 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2162 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2163 + sizeof(struct nd_msg)) &&
2164 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2165 struct nd_msg *msg;
2166
2167 msg = (struct nd_msg *)skb_transport_header(skb);
2168 if (msg->icmph.icmp6_code == 0 &&
2169 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2170 return neigh_reduce(dev, skb);
2171 }
2172 #endif
2173 }
2174
2175 eth = eth_hdr(skb);
2176 f = vxlan_find_mac(vxlan, eth->h_dest);
2177 did_rsc = false;
2178
2179 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2180 (ntohs(eth->h_proto) == ETH_P_IP ||
2181 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2182 did_rsc = route_shortcircuit(dev, skb);
2183 if (did_rsc)
2184 f = vxlan_find_mac(vxlan, eth->h_dest);
2185 }
2186
2187 if (f == NULL) {
2188 f = vxlan_find_mac(vxlan, all_zeros_mac);
2189 if (f == NULL) {
2190 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2191 !is_multicast_ether_addr(eth->h_dest))
2192 vxlan_fdb_miss(vxlan, eth->h_dest);
2193
2194 dev->stats.tx_dropped++;
2195 kfree_skb(skb);
2196 return NETDEV_TX_OK;
2197 }
2198 }
2199
2200 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2201 struct sk_buff *skb1;
2202
2203 if (!fdst) {
2204 fdst = rdst;
2205 continue;
2206 }
2207 skb1 = skb_clone(skb, GFP_ATOMIC);
2208 if (skb1)
2209 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2210 }
2211
2212 if (fdst)
2213 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2214 else
2215 kfree_skb(skb);
2216 return NETDEV_TX_OK;
2217 }
2218
2219 /* Walk the forwarding table and purge stale entries */
2220 static void vxlan_cleanup(unsigned long arg)
2221 {
2222 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2223 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2224 unsigned int h;
2225
2226 if (!netif_running(vxlan->dev))
2227 return;
2228
2229 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2230 struct hlist_node *p, *n;
2231
2232 spin_lock_bh(&vxlan->hash_lock);
2233 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2234 struct vxlan_fdb *f
2235 = container_of(p, struct vxlan_fdb, hlist);
2236 unsigned long timeout;
2237
2238 if (f->state & NUD_PERMANENT)
2239 continue;
2240
2241 timeout = f->used + vxlan->cfg.age_interval * HZ;
2242 if (time_before_eq(timeout, jiffies)) {
2243 netdev_dbg(vxlan->dev,
2244 "garbage collect %pM\n",
2245 f->eth_addr);
2246 f->state = NUD_STALE;
2247 vxlan_fdb_destroy(vxlan, f);
2248 } else if (time_before(timeout, next_timer))
2249 next_timer = timeout;
2250 }
2251 spin_unlock_bh(&vxlan->hash_lock);
2252 }
2253
2254 mod_timer(&vxlan->age_timer, next_timer);
2255 }
2256
2257 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2258 {
2259 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2260 __be32 vni = vxlan->default_dst.remote_vni;
2261
2262 spin_lock(&vn->sock_lock);
2263 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2264 spin_unlock(&vn->sock_lock);
2265 }
2266
2267 /* Setup stats when device is created */
2268 static int vxlan_init(struct net_device *dev)
2269 {
2270 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2271 if (!dev->tstats)
2272 return -ENOMEM;
2273
2274 return 0;
2275 }
2276
2277 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2278 {
2279 struct vxlan_fdb *f;
2280
2281 spin_lock_bh(&vxlan->hash_lock);
2282 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2283 if (f)
2284 vxlan_fdb_destroy(vxlan, f);
2285 spin_unlock_bh(&vxlan->hash_lock);
2286 }
2287
2288 static void vxlan_uninit(struct net_device *dev)
2289 {
2290 struct vxlan_dev *vxlan = netdev_priv(dev);
2291
2292 vxlan_fdb_delete_default(vxlan);
2293
2294 free_percpu(dev->tstats);
2295 }
2296
2297 /* Start ageing timer and join group when device is brought up */
2298 static int vxlan_open(struct net_device *dev)
2299 {
2300 struct vxlan_dev *vxlan = netdev_priv(dev);
2301 int ret;
2302
2303 ret = vxlan_sock_add(vxlan);
2304 if (ret < 0)
2305 return ret;
2306
2307 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2308 ret = vxlan_igmp_join(vxlan);
2309 if (ret == -EADDRINUSE)
2310 ret = 0;
2311 if (ret) {
2312 vxlan_sock_release(vxlan);
2313 return ret;
2314 }
2315 }
2316
2317 if (vxlan->cfg.age_interval)
2318 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2319
2320 return ret;
2321 }
2322
2323 /* Purge the forwarding table */
2324 static void vxlan_flush(struct vxlan_dev *vxlan)
2325 {
2326 unsigned int h;
2327
2328 spin_lock_bh(&vxlan->hash_lock);
2329 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2330 struct hlist_node *p, *n;
2331 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2332 struct vxlan_fdb *f
2333 = container_of(p, struct vxlan_fdb, hlist);
2334 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2335 if (!is_zero_ether_addr(f->eth_addr))
2336 vxlan_fdb_destroy(vxlan, f);
2337 }
2338 }
2339 spin_unlock_bh(&vxlan->hash_lock);
2340 }
2341
2342 /* Cleanup timer and forwarding table on shutdown */
2343 static int vxlan_stop(struct net_device *dev)
2344 {
2345 struct vxlan_dev *vxlan = netdev_priv(dev);
2346 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2347 int ret = 0;
2348
2349 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2350 !vxlan_group_used(vn, vxlan))
2351 ret = vxlan_igmp_leave(vxlan);
2352
2353 del_timer_sync(&vxlan->age_timer);
2354
2355 vxlan_flush(vxlan);
2356 vxlan_sock_release(vxlan);
2357
2358 return ret;
2359 }
2360
2361 /* Stub, nothing needs to be done. */
2362 static void vxlan_set_multicast_list(struct net_device *dev)
2363 {
2364 }
2365
2366 static int __vxlan_change_mtu(struct net_device *dev,
2367 struct net_device *lowerdev,
2368 struct vxlan_rdst *dst, int new_mtu, bool strict)
2369 {
2370 int max_mtu = IP_MAX_MTU;
2371
2372 if (lowerdev)
2373 max_mtu = lowerdev->mtu;
2374
2375 if (dst->remote_ip.sa.sa_family == AF_INET6)
2376 max_mtu -= VXLAN6_HEADROOM;
2377 else
2378 max_mtu -= VXLAN_HEADROOM;
2379
2380 if (new_mtu < 68)
2381 return -EINVAL;
2382
2383 if (new_mtu > max_mtu) {
2384 if (strict)
2385 return -EINVAL;
2386
2387 new_mtu = max_mtu;
2388 }
2389
2390 dev->mtu = new_mtu;
2391 return 0;
2392 }
2393
2394 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2395 {
2396 struct vxlan_dev *vxlan = netdev_priv(dev);
2397 struct vxlan_rdst *dst = &vxlan->default_dst;
2398 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2399 dst->remote_ifindex);
2400 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2401 }
2402
2403 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2404 {
2405 struct vxlan_dev *vxlan = netdev_priv(dev);
2406 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2407 __be16 sport, dport;
2408
2409 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2410 vxlan->cfg.port_max, true);
2411 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2412
2413 if (ip_tunnel_info_af(info) == AF_INET) {
2414 struct rtable *rt;
2415
2416 if (!vxlan->vn4_sock)
2417 return -EINVAL;
2418 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2419 info->key.u.ipv4.dst,
2420 &info->key.u.ipv4.src, NULL, info);
2421 if (IS_ERR(rt))
2422 return PTR_ERR(rt);
2423 ip_rt_put(rt);
2424 } else {
2425 #if IS_ENABLED(CONFIG_IPV6)
2426 struct dst_entry *ndst;
2427
2428 if (!vxlan->vn6_sock)
2429 return -EINVAL;
2430 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2431 info->key.label, &info->key.u.ipv6.dst,
2432 &info->key.u.ipv6.src, NULL, info);
2433 if (IS_ERR(ndst))
2434 return PTR_ERR(ndst);
2435 dst_release(ndst);
2436 #else /* !CONFIG_IPV6 */
2437 return -EPFNOSUPPORT;
2438 #endif
2439 }
2440 info->key.tp_src = sport;
2441 info->key.tp_dst = dport;
2442 return 0;
2443 }
2444
2445 static const struct net_device_ops vxlan_netdev_ether_ops = {
2446 .ndo_init = vxlan_init,
2447 .ndo_uninit = vxlan_uninit,
2448 .ndo_open = vxlan_open,
2449 .ndo_stop = vxlan_stop,
2450 .ndo_start_xmit = vxlan_xmit,
2451 .ndo_get_stats64 = ip_tunnel_get_stats64,
2452 .ndo_set_rx_mode = vxlan_set_multicast_list,
2453 .ndo_change_mtu = vxlan_change_mtu,
2454 .ndo_validate_addr = eth_validate_addr,
2455 .ndo_set_mac_address = eth_mac_addr,
2456 .ndo_fdb_add = vxlan_fdb_add,
2457 .ndo_fdb_del = vxlan_fdb_delete,
2458 .ndo_fdb_dump = vxlan_fdb_dump,
2459 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2460 };
2461
2462 static const struct net_device_ops vxlan_netdev_raw_ops = {
2463 .ndo_init = vxlan_init,
2464 .ndo_uninit = vxlan_uninit,
2465 .ndo_open = vxlan_open,
2466 .ndo_stop = vxlan_stop,
2467 .ndo_start_xmit = vxlan_xmit,
2468 .ndo_get_stats64 = ip_tunnel_get_stats64,
2469 .ndo_change_mtu = vxlan_change_mtu,
2470 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2471 };
2472
2473 /* Info for udev, that this is a virtual tunnel endpoint */
2474 static struct device_type vxlan_type = {
2475 .name = "vxlan",
2476 };
2477
2478 /* Calls the ndo_udp_tunnel_add of the caller in order to
2479 * supply the listening VXLAN udp ports. Callers are expected
2480 * to implement the ndo_udp_tunnel_add.
2481 */
2482 static void vxlan_push_rx_ports(struct net_device *dev)
2483 {
2484 struct vxlan_sock *vs;
2485 struct net *net = dev_net(dev);
2486 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2487 unsigned int i;
2488
2489 spin_lock(&vn->sock_lock);
2490 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2491 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2492 udp_tunnel_push_rx_port(dev, vs->sock,
2493 (vs->flags & VXLAN_F_GPE) ?
2494 UDP_TUNNEL_TYPE_VXLAN_GPE :
2495 UDP_TUNNEL_TYPE_VXLAN);
2496 }
2497 spin_unlock(&vn->sock_lock);
2498 }
2499
2500 /* Initialize the device structure. */
2501 static void vxlan_setup(struct net_device *dev)
2502 {
2503 struct vxlan_dev *vxlan = netdev_priv(dev);
2504 unsigned int h;
2505
2506 eth_hw_addr_random(dev);
2507 ether_setup(dev);
2508
2509 dev->destructor = free_netdev;
2510 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2511
2512 dev->features |= NETIF_F_LLTX;
2513 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2514 dev->features |= NETIF_F_RXCSUM;
2515 dev->features |= NETIF_F_GSO_SOFTWARE;
2516
2517 dev->vlan_features = dev->features;
2518 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2519 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2520 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2521 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2522 netif_keep_dst(dev);
2523 dev->priv_flags |= IFF_NO_QUEUE;
2524
2525 INIT_LIST_HEAD(&vxlan->next);
2526 spin_lock_init(&vxlan->hash_lock);
2527
2528 init_timer_deferrable(&vxlan->age_timer);
2529 vxlan->age_timer.function = vxlan_cleanup;
2530 vxlan->age_timer.data = (unsigned long) vxlan;
2531
2532 vxlan->cfg.dst_port = htons(vxlan_port);
2533
2534 vxlan->dev = dev;
2535
2536 gro_cells_init(&vxlan->gro_cells, dev);
2537
2538 for (h = 0; h < FDB_HASH_SIZE; ++h)
2539 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2540 }
2541
2542 static void vxlan_ether_setup(struct net_device *dev)
2543 {
2544 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2545 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2546 dev->netdev_ops = &vxlan_netdev_ether_ops;
2547 }
2548
2549 static void vxlan_raw_setup(struct net_device *dev)
2550 {
2551 dev->header_ops = NULL;
2552 dev->type = ARPHRD_NONE;
2553 dev->hard_header_len = 0;
2554 dev->addr_len = 0;
2555 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2556 dev->netdev_ops = &vxlan_netdev_raw_ops;
2557 }
2558
2559 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2560 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2561 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2562 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2563 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2564 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2565 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2566 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2567 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2568 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2569 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2570 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2571 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2572 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2573 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2574 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2575 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2576 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2577 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2578 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2579 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2580 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2581 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2582 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2583 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2584 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2585 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2586 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2587 };
2588
2589 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2590 {
2591 if (tb[IFLA_ADDRESS]) {
2592 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2593 pr_debug("invalid link address (not ethernet)\n");
2594 return -EINVAL;
2595 }
2596
2597 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2598 pr_debug("invalid all zero ethernet address\n");
2599 return -EADDRNOTAVAIL;
2600 }
2601 }
2602
2603 if (!data)
2604 return -EINVAL;
2605
2606 if (data[IFLA_VXLAN_ID]) {
2607 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2608 if (id >= VXLAN_VID_MASK)
2609 return -ERANGE;
2610 }
2611
2612 if (data[IFLA_VXLAN_PORT_RANGE]) {
2613 const struct ifla_vxlan_port_range *p
2614 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2615
2616 if (ntohs(p->high) < ntohs(p->low)) {
2617 pr_debug("port range %u .. %u not valid\n",
2618 ntohs(p->low), ntohs(p->high));
2619 return -EINVAL;
2620 }
2621 }
2622
2623 return 0;
2624 }
2625
2626 static void vxlan_get_drvinfo(struct net_device *netdev,
2627 struct ethtool_drvinfo *drvinfo)
2628 {
2629 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2630 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2631 }
2632
2633 static const struct ethtool_ops vxlan_ethtool_ops = {
2634 .get_drvinfo = vxlan_get_drvinfo,
2635 .get_link = ethtool_op_get_link,
2636 };
2637
2638 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2639 __be16 port, u32 flags)
2640 {
2641 struct socket *sock;
2642 struct udp_port_cfg udp_conf;
2643 int err;
2644
2645 memset(&udp_conf, 0, sizeof(udp_conf));
2646
2647 if (ipv6) {
2648 udp_conf.family = AF_INET6;
2649 udp_conf.use_udp6_rx_checksums =
2650 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2651 udp_conf.ipv6_v6only = 1;
2652 } else {
2653 udp_conf.family = AF_INET;
2654 }
2655
2656 udp_conf.local_udp_port = port;
2657
2658 /* Open UDP socket */
2659 err = udp_sock_create(net, &udp_conf, &sock);
2660 if (err < 0)
2661 return ERR_PTR(err);
2662
2663 return sock;
2664 }
2665
2666 /* Create new listen socket if needed */
2667 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2668 __be16 port, u32 flags)
2669 {
2670 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2671 struct vxlan_sock *vs;
2672 struct socket *sock;
2673 unsigned int h;
2674 struct udp_tunnel_sock_cfg tunnel_cfg;
2675
2676 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2677 if (!vs)
2678 return ERR_PTR(-ENOMEM);
2679
2680 for (h = 0; h < VNI_HASH_SIZE; ++h)
2681 INIT_HLIST_HEAD(&vs->vni_list[h]);
2682
2683 sock = vxlan_create_sock(net, ipv6, port, flags);
2684 if (IS_ERR(sock)) {
2685 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2686 PTR_ERR(sock));
2687 kfree(vs);
2688 return ERR_CAST(sock);
2689 }
2690
2691 vs->sock = sock;
2692 atomic_set(&vs->refcnt, 1);
2693 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2694
2695 spin_lock(&vn->sock_lock);
2696 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2697 udp_tunnel_notify_add_rx_port(sock,
2698 (vs->flags & VXLAN_F_GPE) ?
2699 UDP_TUNNEL_TYPE_VXLAN_GPE :
2700 UDP_TUNNEL_TYPE_VXLAN);
2701 spin_unlock(&vn->sock_lock);
2702
2703 /* Mark socket as an encapsulation socket. */
2704 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2705 tunnel_cfg.sk_user_data = vs;
2706 tunnel_cfg.encap_type = 1;
2707 tunnel_cfg.encap_rcv = vxlan_rcv;
2708 tunnel_cfg.encap_destroy = NULL;
2709 tunnel_cfg.gro_receive = vxlan_gro_receive;
2710 tunnel_cfg.gro_complete = vxlan_gro_complete;
2711
2712 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2713
2714 return vs;
2715 }
2716
2717 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2718 {
2719 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2720 struct vxlan_sock *vs = NULL;
2721
2722 if (!vxlan->cfg.no_share) {
2723 spin_lock(&vn->sock_lock);
2724 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2725 vxlan->cfg.dst_port, vxlan->flags);
2726 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2727 spin_unlock(&vn->sock_lock);
2728 return -EBUSY;
2729 }
2730 spin_unlock(&vn->sock_lock);
2731 }
2732 if (!vs)
2733 vs = vxlan_socket_create(vxlan->net, ipv6,
2734 vxlan->cfg.dst_port, vxlan->flags);
2735 if (IS_ERR(vs))
2736 return PTR_ERR(vs);
2737 #if IS_ENABLED(CONFIG_IPV6)
2738 if (ipv6)
2739 vxlan->vn6_sock = vs;
2740 else
2741 #endif
2742 vxlan->vn4_sock = vs;
2743 vxlan_vs_add_dev(vs, vxlan);
2744 return 0;
2745 }
2746
2747 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2748 {
2749 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2750 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2751 int ret = 0;
2752
2753 vxlan->vn4_sock = NULL;
2754 #if IS_ENABLED(CONFIG_IPV6)
2755 vxlan->vn6_sock = NULL;
2756 if (ipv6 || metadata)
2757 ret = __vxlan_sock_add(vxlan, true);
2758 #endif
2759 if (!ret && (!ipv6 || metadata))
2760 ret = __vxlan_sock_add(vxlan, false);
2761 if (ret < 0)
2762 vxlan_sock_release(vxlan);
2763 return ret;
2764 }
2765
2766 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2767 struct vxlan_config *conf)
2768 {
2769 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2770 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2771 struct vxlan_rdst *dst = &vxlan->default_dst;
2772 unsigned short needed_headroom = ETH_HLEN;
2773 int err;
2774 bool use_ipv6 = false;
2775 __be16 default_port = vxlan->cfg.dst_port;
2776 struct net_device *lowerdev = NULL;
2777
2778 if (conf->flags & VXLAN_F_GPE) {
2779 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2780 return -EINVAL;
2781 /* For now, allow GPE only together with COLLECT_METADATA.
2782 * This can be relaxed later; in such case, the other side
2783 * of the PtP link will have to be provided.
2784 */
2785 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2786 return -EINVAL;
2787
2788 vxlan_raw_setup(dev);
2789 } else {
2790 vxlan_ether_setup(dev);
2791 }
2792
2793 vxlan->net = src_net;
2794
2795 dst->remote_vni = conf->vni;
2796
2797 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2798
2799 /* Unless IPv6 is explicitly requested, assume IPv4 */
2800 if (!dst->remote_ip.sa.sa_family)
2801 dst->remote_ip.sa.sa_family = AF_INET;
2802
2803 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2804 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2805 if (!IS_ENABLED(CONFIG_IPV6))
2806 return -EPFNOSUPPORT;
2807 use_ipv6 = true;
2808 vxlan->flags |= VXLAN_F_IPV6;
2809 }
2810
2811 if (conf->label && !use_ipv6) {
2812 pr_info("label only supported in use with IPv6\n");
2813 return -EINVAL;
2814 }
2815
2816 if (conf->remote_ifindex) {
2817 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2818 dst->remote_ifindex = conf->remote_ifindex;
2819
2820 if (!lowerdev) {
2821 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2822 return -ENODEV;
2823 }
2824
2825 #if IS_ENABLED(CONFIG_IPV6)
2826 if (use_ipv6) {
2827 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2828 if (idev && idev->cnf.disable_ipv6) {
2829 pr_info("IPv6 is disabled via sysctl\n");
2830 return -EPERM;
2831 }
2832 }
2833 #endif
2834
2835 if (!conf->mtu)
2836 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2837
2838 needed_headroom = lowerdev->hard_header_len;
2839 }
2840
2841 if (conf->mtu) {
2842 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2843 if (err)
2844 return err;
2845 }
2846
2847 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2848 needed_headroom += VXLAN6_HEADROOM;
2849 else
2850 needed_headroom += VXLAN_HEADROOM;
2851 dev->needed_headroom = needed_headroom;
2852
2853 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2854 if (!vxlan->cfg.dst_port) {
2855 if (conf->flags & VXLAN_F_GPE)
2856 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2857 else
2858 vxlan->cfg.dst_port = default_port;
2859 }
2860 vxlan->flags |= conf->flags;
2861
2862 if (!vxlan->cfg.age_interval)
2863 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2864
2865 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2866 if (tmp->cfg.vni == conf->vni &&
2867 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2868 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2869 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2870 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2871 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2872 return -EEXIST;
2873 }
2874
2875 dev->ethtool_ops = &vxlan_ethtool_ops;
2876
2877 /* create an fdb entry for a valid default destination */
2878 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2879 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2880 &vxlan->default_dst.remote_ip,
2881 NUD_REACHABLE|NUD_PERMANENT,
2882 NLM_F_EXCL|NLM_F_CREATE,
2883 vxlan->cfg.dst_port,
2884 vxlan->default_dst.remote_vni,
2885 vxlan->default_dst.remote_ifindex,
2886 NTF_SELF);
2887 if (err)
2888 return err;
2889 }
2890
2891 err = register_netdevice(dev);
2892 if (err) {
2893 vxlan_fdb_delete_default(vxlan);
2894 return err;
2895 }
2896
2897 list_add(&vxlan->next, &vn->vxlan_list);
2898
2899 return 0;
2900 }
2901
2902 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2903 struct nlattr *tb[], struct nlattr *data[])
2904 {
2905 struct vxlan_config conf;
2906 int err;
2907
2908 memset(&conf, 0, sizeof(conf));
2909
2910 if (data[IFLA_VXLAN_ID])
2911 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2912
2913 if (data[IFLA_VXLAN_GROUP]) {
2914 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2915 } else if (data[IFLA_VXLAN_GROUP6]) {
2916 if (!IS_ENABLED(CONFIG_IPV6))
2917 return -EPFNOSUPPORT;
2918
2919 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2920 conf.remote_ip.sa.sa_family = AF_INET6;
2921 }
2922
2923 if (data[IFLA_VXLAN_LOCAL]) {
2924 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2925 conf.saddr.sa.sa_family = AF_INET;
2926 } else if (data[IFLA_VXLAN_LOCAL6]) {
2927 if (!IS_ENABLED(CONFIG_IPV6))
2928 return -EPFNOSUPPORT;
2929
2930 /* TODO: respect scope id */
2931 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2932 conf.saddr.sa.sa_family = AF_INET6;
2933 }
2934
2935 if (data[IFLA_VXLAN_LINK])
2936 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2937
2938 if (data[IFLA_VXLAN_TOS])
2939 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2940
2941 if (data[IFLA_VXLAN_TTL])
2942 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2943
2944 if (data[IFLA_VXLAN_LABEL])
2945 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2946 IPV6_FLOWLABEL_MASK;
2947
2948 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2949 conf.flags |= VXLAN_F_LEARN;
2950
2951 if (data[IFLA_VXLAN_AGEING])
2952 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2953
2954 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2955 conf.flags |= VXLAN_F_PROXY;
2956
2957 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2958 conf.flags |= VXLAN_F_RSC;
2959
2960 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2961 conf.flags |= VXLAN_F_L2MISS;
2962
2963 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2964 conf.flags |= VXLAN_F_L3MISS;
2965
2966 if (data[IFLA_VXLAN_LIMIT])
2967 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2968
2969 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2970 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2971 conf.flags |= VXLAN_F_COLLECT_METADATA;
2972
2973 if (data[IFLA_VXLAN_PORT_RANGE]) {
2974 const struct ifla_vxlan_port_range *p
2975 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2976 conf.port_min = ntohs(p->low);
2977 conf.port_max = ntohs(p->high);
2978 }
2979
2980 if (data[IFLA_VXLAN_PORT])
2981 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2982
2983 if (data[IFLA_VXLAN_UDP_CSUM] &&
2984 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2985 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2986
2987 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2988 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2989 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2990
2991 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2992 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2993 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2994
2995 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2996 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2997 conf.flags |= VXLAN_F_REMCSUM_TX;
2998
2999 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3000 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3001 conf.flags |= VXLAN_F_REMCSUM_RX;
3002
3003 if (data[IFLA_VXLAN_GBP])
3004 conf.flags |= VXLAN_F_GBP;
3005
3006 if (data[IFLA_VXLAN_GPE])
3007 conf.flags |= VXLAN_F_GPE;
3008
3009 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3010 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3011
3012 if (tb[IFLA_MTU])
3013 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3014
3015 err = vxlan_dev_configure(src_net, dev, &conf);
3016 switch (err) {
3017 case -ENODEV:
3018 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3019 break;
3020
3021 case -EPERM:
3022 pr_info("IPv6 is disabled via sysctl\n");
3023 break;
3024
3025 case -EEXIST:
3026 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
3027 break;
3028
3029 case -EINVAL:
3030 pr_info("unsupported combination of extensions\n");
3031 break;
3032 }
3033
3034 return err;
3035 }
3036
3037 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3038 {
3039 struct vxlan_dev *vxlan = netdev_priv(dev);
3040 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3041
3042 spin_lock(&vn->sock_lock);
3043 if (!hlist_unhashed(&vxlan->hlist))
3044 hlist_del_rcu(&vxlan->hlist);
3045 spin_unlock(&vn->sock_lock);
3046
3047 gro_cells_destroy(&vxlan->gro_cells);
3048 list_del(&vxlan->next);
3049 unregister_netdevice_queue(dev, head);
3050 }
3051
3052 static size_t vxlan_get_size(const struct net_device *dev)
3053 {
3054
3055 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3056 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3057 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3058 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3059 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3060 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3061 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3062 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3063 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3064 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3065 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3066 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3067 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3068 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3069 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3070 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3071 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3072 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3073 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3074 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3075 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3076 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3077 0;
3078 }
3079
3080 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3081 {
3082 const struct vxlan_dev *vxlan = netdev_priv(dev);
3083 const struct vxlan_rdst *dst = &vxlan->default_dst;
3084 struct ifla_vxlan_port_range ports = {
3085 .low = htons(vxlan->cfg.port_min),
3086 .high = htons(vxlan->cfg.port_max),
3087 };
3088
3089 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3090 goto nla_put_failure;
3091
3092 if (!vxlan_addr_any(&dst->remote_ip)) {
3093 if (dst->remote_ip.sa.sa_family == AF_INET) {
3094 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3095 dst->remote_ip.sin.sin_addr.s_addr))
3096 goto nla_put_failure;
3097 #if IS_ENABLED(CONFIG_IPV6)
3098 } else {
3099 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3100 &dst->remote_ip.sin6.sin6_addr))
3101 goto nla_put_failure;
3102 #endif
3103 }
3104 }
3105
3106 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3107 goto nla_put_failure;
3108
3109 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3110 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3111 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3112 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3113 goto nla_put_failure;
3114 #if IS_ENABLED(CONFIG_IPV6)
3115 } else {
3116 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3117 &vxlan->cfg.saddr.sin6.sin6_addr))
3118 goto nla_put_failure;
3119 #endif
3120 }
3121 }
3122
3123 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3124 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3125 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3126 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3127 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3128 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3129 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3130 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3131 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3132 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3133 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3134 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3135 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3136 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3137 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3138 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3139 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3140 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3141 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3142 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3143 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3144 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3145 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3146 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3147 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3148 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3149 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3150 goto nla_put_failure;
3151
3152 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3153 goto nla_put_failure;
3154
3155 if (vxlan->flags & VXLAN_F_GBP &&
3156 nla_put_flag(skb, IFLA_VXLAN_GBP))
3157 goto nla_put_failure;
3158
3159 if (vxlan->flags & VXLAN_F_GPE &&
3160 nla_put_flag(skb, IFLA_VXLAN_GPE))
3161 goto nla_put_failure;
3162
3163 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3164 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3165 goto nla_put_failure;
3166
3167 return 0;
3168
3169 nla_put_failure:
3170 return -EMSGSIZE;
3171 }
3172
3173 static struct net *vxlan_get_link_net(const struct net_device *dev)
3174 {
3175 struct vxlan_dev *vxlan = netdev_priv(dev);
3176
3177 return vxlan->net;
3178 }
3179
3180 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3181 .kind = "vxlan",
3182 .maxtype = IFLA_VXLAN_MAX,
3183 .policy = vxlan_policy,
3184 .priv_size = sizeof(struct vxlan_dev),
3185 .setup = vxlan_setup,
3186 .validate = vxlan_validate,
3187 .newlink = vxlan_newlink,
3188 .dellink = vxlan_dellink,
3189 .get_size = vxlan_get_size,
3190 .fill_info = vxlan_fill_info,
3191 .get_link_net = vxlan_get_link_net,
3192 };
3193
3194 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3195 u8 name_assign_type,
3196 struct vxlan_config *conf)
3197 {
3198 struct nlattr *tb[IFLA_MAX + 1];
3199 struct net_device *dev;
3200 int err;
3201
3202 memset(&tb, 0, sizeof(tb));
3203
3204 dev = rtnl_create_link(net, name, name_assign_type,
3205 &vxlan_link_ops, tb);
3206 if (IS_ERR(dev))
3207 return dev;
3208
3209 err = vxlan_dev_configure(net, dev, conf);
3210 if (err < 0) {
3211 free_netdev(dev);
3212 return ERR_PTR(err);
3213 }
3214
3215 err = rtnl_configure_link(dev, NULL);
3216 if (err < 0) {
3217 LIST_HEAD(list_kill);
3218
3219 vxlan_dellink(dev, &list_kill);
3220 unregister_netdevice_many(&list_kill);
3221 return ERR_PTR(err);
3222 }
3223
3224 return dev;
3225 }
3226 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3227
3228 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3229 struct net_device *dev)
3230 {
3231 struct vxlan_dev *vxlan, *next;
3232 LIST_HEAD(list_kill);
3233
3234 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3235 struct vxlan_rdst *dst = &vxlan->default_dst;
3236
3237 /* In case we created vxlan device with carrier
3238 * and we loose the carrier due to module unload
3239 * we also need to remove vxlan device. In other
3240 * cases, it's not necessary and remote_ifindex
3241 * is 0 here, so no matches.
3242 */
3243 if (dst->remote_ifindex == dev->ifindex)
3244 vxlan_dellink(vxlan->dev, &list_kill);
3245 }
3246
3247 unregister_netdevice_many(&list_kill);
3248 }
3249
3250 static int vxlan_netdevice_event(struct notifier_block *unused,
3251 unsigned long event, void *ptr)
3252 {
3253 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3254 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3255
3256 if (event == NETDEV_UNREGISTER)
3257 vxlan_handle_lowerdev_unregister(vn, dev);
3258 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3259 vxlan_push_rx_ports(dev);
3260
3261 return NOTIFY_DONE;
3262 }
3263
3264 static struct notifier_block vxlan_notifier_block __read_mostly = {
3265 .notifier_call = vxlan_netdevice_event,
3266 };
3267
3268 static __net_init int vxlan_init_net(struct net *net)
3269 {
3270 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3271 unsigned int h;
3272
3273 INIT_LIST_HEAD(&vn->vxlan_list);
3274 spin_lock_init(&vn->sock_lock);
3275
3276 for (h = 0; h < PORT_HASH_SIZE; ++h)
3277 INIT_HLIST_HEAD(&vn->sock_list[h]);
3278
3279 return 0;
3280 }
3281
3282 static void __net_exit vxlan_exit_net(struct net *net)
3283 {
3284 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3285 struct vxlan_dev *vxlan, *next;
3286 struct net_device *dev, *aux;
3287 LIST_HEAD(list);
3288
3289 rtnl_lock();
3290 for_each_netdev_safe(net, dev, aux)
3291 if (dev->rtnl_link_ops == &vxlan_link_ops)
3292 unregister_netdevice_queue(dev, &list);
3293
3294 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3295 /* If vxlan->dev is in the same netns, it has already been added
3296 * to the list by the previous loop.
3297 */
3298 if (!net_eq(dev_net(vxlan->dev), net)) {
3299 gro_cells_destroy(&vxlan->gro_cells);
3300 unregister_netdevice_queue(vxlan->dev, &list);
3301 }
3302 }
3303
3304 unregister_netdevice_many(&list);
3305 rtnl_unlock();
3306 }
3307
3308 static struct pernet_operations vxlan_net_ops = {
3309 .init = vxlan_init_net,
3310 .exit = vxlan_exit_net,
3311 .id = &vxlan_net_id,
3312 .size = sizeof(struct vxlan_net),
3313 };
3314
3315 static int __init vxlan_init_module(void)
3316 {
3317 int rc;
3318
3319 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3320
3321 rc = register_pernet_subsys(&vxlan_net_ops);
3322 if (rc)
3323 goto out1;
3324
3325 rc = register_netdevice_notifier(&vxlan_notifier_block);
3326 if (rc)
3327 goto out2;
3328
3329 rc = rtnl_link_register(&vxlan_link_ops);
3330 if (rc)
3331 goto out3;
3332
3333 return 0;
3334 out3:
3335 unregister_netdevice_notifier(&vxlan_notifier_block);
3336 out2:
3337 unregister_pernet_subsys(&vxlan_net_ops);
3338 out1:
3339 return rc;
3340 }
3341 late_initcall(vxlan_init_module);
3342
3343 static void __exit vxlan_cleanup_module(void)
3344 {
3345 rtnl_link_unregister(&vxlan_link_ops);
3346 unregister_netdevice_notifier(&vxlan_notifier_block);
3347 unregister_pernet_subsys(&vxlan_net_ops);
3348 /* rcu_barrier() is called by netns */
3349 }
3350 module_exit(vxlan_cleanup_module);
3351
3352 MODULE_LICENSE("GPL");
3353 MODULE_VERSION(VXLAN_VERSION);
3354 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3355 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3356 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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