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geneve/vxlan: offload ports on register/unregister events
[linux/fpc-iii.git] / drivers / net / vxlan.c
blobdbca067540d01adf53845ced90fd2c83a4d97f47
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/udp.h>
18 #include <linux/igmp.h>
19 #include <linux/if_ether.h>
20 #include <linux/ethtool.h>
21 #include <net/arp.h>
22 #include <net/ndisc.h>
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/rtnetlink.h>
26 #include <net/inet_ecn.h>
27 #include <net/net_namespace.h>
28 #include <net/netns/generic.h>
29 #include <net/vxlan.h>
30
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
34 #endif
35
36 #define VXLAN_VERSION "0.1"
37
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
42
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
46 */
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
50
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
54
55 static unsigned int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
57
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
59
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
61
62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
63
64 /* per-network namespace private data for this module */
65 struct vxlan_net {
66 struct list_head vxlan_list;
67 struct hlist_head sock_list[PORT_HASH_SIZE];
68 spinlock_t sock_lock;
69 };
70
71 /* Forwarding table entry */
72 struct vxlan_fdb {
73 struct hlist_node hlist; /* linked list of entries */
74 struct rcu_head rcu;
75 unsigned long updated; /* jiffies */
76 unsigned long used;
77 struct list_head remotes;
78 u8 eth_addr[ETH_ALEN];
79 u16 state; /* see ndm_state */
80 __be32 vni;
81 u8 flags; /* see ndm_flags */
82 };
83
84 /* salt for hash table */
85 static u32 vxlan_salt __read_mostly;
86
87 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
88 {
89 return vs->flags & VXLAN_F_COLLECT_METADATA ||
90 ip_tunnel_collect_metadata();
91 }
92
93 #if IS_ENABLED(CONFIG_IPV6)
94 static inline
95 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
96 {
97 if (a->sa.sa_family != b->sa.sa_family)
98 return false;
99 if (a->sa.sa_family == AF_INET6)
100 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
101 else
102 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
103 }
104
105 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
106 {
107 if (ipa->sa.sa_family == AF_INET6)
108 return ipv6_addr_any(&ipa->sin6.sin6_addr);
109 else
110 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
111 }
112
113 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
114 {
115 if (ipa->sa.sa_family == AF_INET6)
116 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
117 else
118 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
119 }
120
121 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
122 {
123 if (nla_len(nla) >= sizeof(struct in6_addr)) {
124 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
125 ip->sa.sa_family = AF_INET6;
126 return 0;
127 } else if (nla_len(nla) >= sizeof(__be32)) {
128 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
129 ip->sa.sa_family = AF_INET;
130 return 0;
131 } else {
132 return -EAFNOSUPPORT;
133 }
134 }
135
136 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
137 const union vxlan_addr *ip)
138 {
139 if (ip->sa.sa_family == AF_INET6)
140 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
141 else
142 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
143 }
144
145 #else /* !CONFIG_IPV6 */
146
147 static inline
148 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
149 {
150 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
151 }
152
153 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
154 {
155 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
156 }
157
158 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
159 {
160 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
161 }
162
163 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
164 {
165 if (nla_len(nla) >= sizeof(struct in6_addr)) {
166 return -EAFNOSUPPORT;
167 } else if (nla_len(nla) >= sizeof(__be32)) {
168 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
169 ip->sa.sa_family = AF_INET;
170 return 0;
171 } else {
172 return -EAFNOSUPPORT;
173 }
174 }
175
176 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
177 const union vxlan_addr *ip)
178 {
179 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
180 }
181 #endif
182
183 /* Virtual Network hash table head */
184 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
185 {
186 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
187 }
188
189 /* Socket hash table head */
190 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
191 {
192 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
193
194 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
195 }
196
197 /* First remote destination for a forwarding entry.
198 * Guaranteed to be non-NULL because remotes are never deleted.
199 */
200 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
201 {
202 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
203 }
204
205 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
206 {
207 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
208 }
209
210 /* Find VXLAN socket based on network namespace, address family and UDP port
211 * and enabled unshareable flags.
212 */
213 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
214 __be16 port, u32 flags)
215 {
216 struct vxlan_sock *vs;
217
218 flags &= VXLAN_F_RCV_FLAGS;
219
220 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
221 if (inet_sk(vs->sock->sk)->inet_sport == port &&
222 vxlan_get_sk_family(vs) == family &&
223 vs->flags == flags)
224 return vs;
225 }
226 return NULL;
227 }
228
229 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
230 __be32 vni)
231 {
232 struct vxlan_dev_node *node;
233
234 /* For flow based devices, map all packets to VNI 0 */
235 if (vs->flags & VXLAN_F_COLLECT_METADATA)
236 vni = 0;
237
238 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
239 if (node->vxlan->default_dst.remote_vni != vni)
240 continue;
241
242 if (IS_ENABLED(CONFIG_IPV6)) {
243 const struct vxlan_config *cfg = &node->vxlan->cfg;
244
245 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
246 cfg->remote_ifindex != ifindex)
247 continue;
248 }
249
250 return node->vxlan;
251 }
252
253 return NULL;
254 }
255
256 /* Look up VNI in a per net namespace table */
257 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
258 __be32 vni, sa_family_t family,
259 __be16 port, u32 flags)
260 {
261 struct vxlan_sock *vs;
262
263 vs = vxlan_find_sock(net, family, port, flags);
264 if (!vs)
265 return NULL;
266
267 return vxlan_vs_find_vni(vs, ifindex, vni);
268 }
269
270 /* Fill in neighbour message in skbuff. */
271 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
272 const struct vxlan_fdb *fdb,
273 u32 portid, u32 seq, int type, unsigned int flags,
274 const struct vxlan_rdst *rdst)
275 {
276 unsigned long now = jiffies;
277 struct nda_cacheinfo ci;
278 struct nlmsghdr *nlh;
279 struct ndmsg *ndm;
280 bool send_ip, send_eth;
281
282 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
283 if (nlh == NULL)
284 return -EMSGSIZE;
285
286 ndm = nlmsg_data(nlh);
287 memset(ndm, 0, sizeof(*ndm));
288
289 send_eth = send_ip = true;
290
291 if (type == RTM_GETNEIGH) {
292 send_ip = !vxlan_addr_any(&rdst->remote_ip);
293 send_eth = !is_zero_ether_addr(fdb->eth_addr);
294 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
295 } else
296 ndm->ndm_family = AF_BRIDGE;
297 ndm->ndm_state = fdb->state;
298 ndm->ndm_ifindex = vxlan->dev->ifindex;
299 ndm->ndm_flags = fdb->flags;
300 ndm->ndm_type = RTN_UNICAST;
301
302 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
303 nla_put_s32(skb, NDA_LINK_NETNSID,
304 peernet2id(dev_net(vxlan->dev), vxlan->net)))
305 goto nla_put_failure;
306
307 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
308 goto nla_put_failure;
309
310 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
311 goto nla_put_failure;
312
313 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
314 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
315 goto nla_put_failure;
316 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
317 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
318 goto nla_put_failure;
319 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
320 nla_put_u32(skb, NDA_SRC_VNI,
321 be32_to_cpu(fdb->vni)))
322 goto nla_put_failure;
323 if (rdst->remote_ifindex &&
324 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
325 goto nla_put_failure;
326
327 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
328 ci.ndm_confirmed = 0;
329 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
330 ci.ndm_refcnt = 0;
331
332 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
333 goto nla_put_failure;
334
335 nlmsg_end(skb, nlh);
336 return 0;
337
338 nla_put_failure:
339 nlmsg_cancel(skb, nlh);
340 return -EMSGSIZE;
341 }
342
343 static inline size_t vxlan_nlmsg_size(void)
344 {
345 return NLMSG_ALIGN(sizeof(struct ndmsg))
346 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
347 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
348 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
349 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
350 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
351 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
352 + nla_total_size(sizeof(struct nda_cacheinfo));
353 }
354
355 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
356 struct vxlan_rdst *rd, int type)
357 {
358 struct net *net = dev_net(vxlan->dev);
359 struct sk_buff *skb;
360 int err = -ENOBUFS;
361
362 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
363 if (skb == NULL)
364 goto errout;
365
366 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
367 if (err < 0) {
368 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
369 WARN_ON(err == -EMSGSIZE);
370 kfree_skb(skb);
371 goto errout;
372 }
373
374 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
375 return;
376 errout:
377 if (err < 0)
378 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
379 }
380
381 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
382 {
383 struct vxlan_dev *vxlan = netdev_priv(dev);
384 struct vxlan_fdb f = {
385 .state = NUD_STALE,
386 };
387 struct vxlan_rdst remote = {
388 .remote_ip = *ipa, /* goes to NDA_DST */
389 .remote_vni = cpu_to_be32(VXLAN_N_VID),
390 };
391
392 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
393 }
394
395 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
396 {
397 struct vxlan_fdb f = {
398 .state = NUD_STALE,
399 };
400 struct vxlan_rdst remote = { };
401
402 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
403
404 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
405 }
406
407 /* Hash Ethernet address */
408 static u32 eth_hash(const unsigned char *addr)
409 {
410 u64 value = get_unaligned((u64 *)addr);
411
412 /* only want 6 bytes */
413 #ifdef __BIG_ENDIAN
414 value >>= 16;
415 #else
416 value <<= 16;
417 #endif
418 return hash_64(value, FDB_HASH_BITS);
419 }
420
421 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
422 {
423 /* use 1 byte of OUI and 3 bytes of NIC */
424 u32 key = get_unaligned((u32 *)(addr + 2));
425
426 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
427 }
428
429 /* Hash chain to use given mac address */
430 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
431 const u8 *mac, __be32 vni)
432 {
433 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
434 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
435 else
436 return &vxlan->fdb_head[eth_hash(mac)];
437 }
438
439 /* Look up Ethernet address in forwarding table */
440 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
441 const u8 *mac, __be32 vni)
442 {
443 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
444 struct vxlan_fdb *f;
445
446 hlist_for_each_entry_rcu(f, head, hlist) {
447 if (ether_addr_equal(mac, f->eth_addr)) {
448 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
449 if (vni == f->vni)
450 return f;
451 } else {
452 return f;
453 }
454 }
455 }
456
457 return NULL;
458 }
459
460 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
461 const u8 *mac, __be32 vni)
462 {
463 struct vxlan_fdb *f;
464
465 f = __vxlan_find_mac(vxlan, mac, vni);
466 if (f)
467 f->used = jiffies;
468
469 return f;
470 }
471
472 /* caller should hold vxlan->hash_lock */
473 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
474 union vxlan_addr *ip, __be16 port,
475 __be32 vni, __u32 ifindex)
476 {
477 struct vxlan_rdst *rd;
478
479 list_for_each_entry(rd, &f->remotes, list) {
480 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
481 rd->remote_port == port &&
482 rd->remote_vni == vni &&
483 rd->remote_ifindex == ifindex)
484 return rd;
485 }
486
487 return NULL;
488 }
489
490 /* Replace destination of unicast mac */
491 static int vxlan_fdb_replace(struct vxlan_fdb *f,
492 union vxlan_addr *ip, __be16 port, __be32 vni,
493 __u32 ifindex)
494 {
495 struct vxlan_rdst *rd;
496
497 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
498 if (rd)
499 return 0;
500
501 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
502 if (!rd)
503 return 0;
504
505 dst_cache_reset(&rd->dst_cache);
506 rd->remote_ip = *ip;
507 rd->remote_port = port;
508 rd->remote_vni = vni;
509 rd->remote_ifindex = ifindex;
510 return 1;
511 }
512
513 /* Add/update destinations for multicast */
514 static int vxlan_fdb_append(struct vxlan_fdb *f,
515 union vxlan_addr *ip, __be16 port, __be32 vni,
516 __u32 ifindex, struct vxlan_rdst **rdp)
517 {
518 struct vxlan_rdst *rd;
519
520 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
521 if (rd)
522 return 0;
523
524 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
525 if (rd == NULL)
526 return -ENOBUFS;
527
528 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
529 kfree(rd);
530 return -ENOBUFS;
531 }
532
533 rd->remote_ip = *ip;
534 rd->remote_port = port;
535 rd->remote_vni = vni;
536 rd->remote_ifindex = ifindex;
537
538 list_add_tail_rcu(&rd->list, &f->remotes);
539
540 *rdp = rd;
541 return 1;
542 }
543
544 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
545 unsigned int off,
546 struct vxlanhdr *vh, size_t hdrlen,
547 __be32 vni_field,
548 struct gro_remcsum *grc,
549 bool nopartial)
550 {
551 size_t start, offset;
552
553 if (skb->remcsum_offload)
554 return vh;
555
556 if (!NAPI_GRO_CB(skb)->csum_valid)
557 return NULL;
558
559 start = vxlan_rco_start(vni_field);
560 offset = start + vxlan_rco_offset(vni_field);
561
562 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
563 start, offset, grc, nopartial);
564
565 skb->remcsum_offload = 1;
566
567 return vh;
568 }
569
570 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
571 struct sk_buff **head,
572 struct sk_buff *skb)
573 {
574 struct sk_buff *p, **pp = NULL;
575 struct vxlanhdr *vh, *vh2;
576 unsigned int hlen, off_vx;
577 int flush = 1;
578 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
579 __be32 flags;
580 struct gro_remcsum grc;
581
582 skb_gro_remcsum_init(&grc);
583
584 off_vx = skb_gro_offset(skb);
585 hlen = off_vx + sizeof(*vh);
586 vh = skb_gro_header_fast(skb, off_vx);
587 if (skb_gro_header_hard(skb, hlen)) {
588 vh = skb_gro_header_slow(skb, hlen, off_vx);
589 if (unlikely(!vh))
590 goto out;
591 }
592
593 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
594
595 flags = vh->vx_flags;
596
597 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
598 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
599 vh->vx_vni, &grc,
600 !!(vs->flags &
601 VXLAN_F_REMCSUM_NOPARTIAL));
602
603 if (!vh)
604 goto out;
605 }
606
607 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
608
609 for (p = *head; p; p = p->next) {
610 if (!NAPI_GRO_CB(p)->same_flow)
611 continue;
612
613 vh2 = (struct vxlanhdr *)(p->data + off_vx);
614 if (vh->vx_flags != vh2->vx_flags ||
615 vh->vx_vni != vh2->vx_vni) {
616 NAPI_GRO_CB(p)->same_flow = 0;
617 continue;
618 }
619 }
620
621 pp = call_gro_receive(eth_gro_receive, head, skb);
622 flush = 0;
623
624 out:
625 skb_gro_remcsum_cleanup(skb, &grc);
626 NAPI_GRO_CB(skb)->flush |= flush;
627
628 return pp;
629 }
630
631 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
632 {
633 /* Sets 'skb->inner_mac_header' since we are always called with
634 * 'skb->encapsulation' set.
635 */
636 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
637 }
638
639 /* Add new entry to forwarding table -- assumes lock held */
640 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
641 const u8 *mac, union vxlan_addr *ip,
642 __u16 state, __u16 flags,
643 __be16 port, __be32 src_vni, __be32 vni,
644 __u32 ifindex, __u8 ndm_flags)
645 {
646 struct vxlan_rdst *rd = NULL;
647 struct vxlan_fdb *f;
648 int notify = 0;
649 int rc;
650
651 f = __vxlan_find_mac(vxlan, mac, src_vni);
652 if (f) {
653 if (flags & NLM_F_EXCL) {
654 netdev_dbg(vxlan->dev,
655 "lost race to create %pM\n", mac);
656 return -EEXIST;
657 }
658 if (f->state != state) {
659 f->state = state;
660 f->updated = jiffies;
661 notify = 1;
662 }
663 if (f->flags != ndm_flags) {
664 f->flags = ndm_flags;
665 f->updated = jiffies;
666 notify = 1;
667 }
668 if ((flags & NLM_F_REPLACE)) {
669 /* Only change unicasts */
670 if (!(is_multicast_ether_addr(f->eth_addr) ||
671 is_zero_ether_addr(f->eth_addr))) {
672 notify |= vxlan_fdb_replace(f, ip, port, vni,
673 ifindex);
674 } else
675 return -EOPNOTSUPP;
676 }
677 if ((flags & NLM_F_APPEND) &&
678 (is_multicast_ether_addr(f->eth_addr) ||
679 is_zero_ether_addr(f->eth_addr))) {
680 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
681
682 if (rc < 0)
683 return rc;
684 notify |= rc;
685 }
686 } else {
687 if (!(flags & NLM_F_CREATE))
688 return -ENOENT;
689
690 if (vxlan->cfg.addrmax &&
691 vxlan->addrcnt >= vxlan->cfg.addrmax)
692 return -ENOSPC;
693
694 /* Disallow replace to add a multicast entry */
695 if ((flags & NLM_F_REPLACE) &&
696 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
697 return -EOPNOTSUPP;
698
699 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
700 f = kmalloc(sizeof(*f), GFP_ATOMIC);
701 if (!f)
702 return -ENOMEM;
703
704 notify = 1;
705 f->state = state;
706 f->flags = ndm_flags;
707 f->updated = f->used = jiffies;
708 f->vni = src_vni;
709 INIT_LIST_HEAD(&f->remotes);
710 memcpy(f->eth_addr, mac, ETH_ALEN);
711
712 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
713 if (rc < 0) {
714 kfree(f);
715 return rc;
716 }
717
718 ++vxlan->addrcnt;
719 hlist_add_head_rcu(&f->hlist,
720 vxlan_fdb_head(vxlan, mac, src_vni));
721 }
722
723 if (notify) {
724 if (rd == NULL)
725 rd = first_remote_rtnl(f);
726 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
727 }
728
729 return 0;
730 }
731
732 static void vxlan_fdb_free(struct rcu_head *head)
733 {
734 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
735 struct vxlan_rdst *rd, *nd;
736
737 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
738 dst_cache_destroy(&rd->dst_cache);
739 kfree(rd);
740 }
741 kfree(f);
742 }
743
744 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
745 {
746 netdev_dbg(vxlan->dev,
747 "delete %pM\n", f->eth_addr);
748
749 --vxlan->addrcnt;
750 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
751
752 hlist_del_rcu(&f->hlist);
753 call_rcu(&f->rcu, vxlan_fdb_free);
754 }
755
756 static void vxlan_dst_free(struct rcu_head *head)
757 {
758 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
759
760 dst_cache_destroy(&rd->dst_cache);
761 kfree(rd);
762 }
763
764 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
765 struct vxlan_rdst *rd)
766 {
767 list_del_rcu(&rd->list);
768 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
769 call_rcu(&rd->rcu, vxlan_dst_free);
770 }
771
772 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
773 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
774 __be32 *vni, u32 *ifindex)
775 {
776 struct net *net = dev_net(vxlan->dev);
777 int err;
778
779 if (tb[NDA_DST]) {
780 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
781 if (err)
782 return err;
783 } else {
784 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
785 if (remote->sa.sa_family == AF_INET) {
786 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
787 ip->sa.sa_family = AF_INET;
788 #if IS_ENABLED(CONFIG_IPV6)
789 } else {
790 ip->sin6.sin6_addr = in6addr_any;
791 ip->sa.sa_family = AF_INET6;
792 #endif
793 }
794 }
795
796 if (tb[NDA_PORT]) {
797 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
798 return -EINVAL;
799 *port = nla_get_be16(tb[NDA_PORT]);
800 } else {
801 *port = vxlan->cfg.dst_port;
802 }
803
804 if (tb[NDA_VNI]) {
805 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
806 return -EINVAL;
807 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
808 } else {
809 *vni = vxlan->default_dst.remote_vni;
810 }
811
812 if (tb[NDA_SRC_VNI]) {
813 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
814 return -EINVAL;
815 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
816 } else {
817 *src_vni = vxlan->default_dst.remote_vni;
818 }
819
820 if (tb[NDA_IFINDEX]) {
821 struct net_device *tdev;
822
823 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
824 return -EINVAL;
825 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
826 tdev = __dev_get_by_index(net, *ifindex);
827 if (!tdev)
828 return -EADDRNOTAVAIL;
829 } else {
830 *ifindex = 0;
831 }
832
833 return 0;
834 }
835
836 /* Add static entry (via netlink) */
837 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
838 struct net_device *dev,
839 const unsigned char *addr, u16 vid, u16 flags)
840 {
841 struct vxlan_dev *vxlan = netdev_priv(dev);
842 /* struct net *net = dev_net(vxlan->dev); */
843 union vxlan_addr ip;
844 __be16 port;
845 __be32 src_vni, vni;
846 u32 ifindex;
847 int err;
848
849 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
850 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
851 ndm->ndm_state);
852 return -EINVAL;
853 }
854
855 if (tb[NDA_DST] == NULL)
856 return -EINVAL;
857
858 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
859 if (err)
860 return err;
861
862 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
863 return -EAFNOSUPPORT;
864
865 spin_lock_bh(&vxlan->hash_lock);
866 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
867 port, src_vni, vni, ifindex, ndm->ndm_flags);
868 spin_unlock_bh(&vxlan->hash_lock);
869
870 return err;
871 }
872
873 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
874 const unsigned char *addr, union vxlan_addr ip,
875 __be16 port, __be32 src_vni, u32 vni, u32 ifindex,
876 u16 vid)
877 {
878 struct vxlan_fdb *f;
879 struct vxlan_rdst *rd = NULL;
880 int err = -ENOENT;
881
882 f = vxlan_find_mac(vxlan, addr, src_vni);
883 if (!f)
884 return err;
885
886 if (!vxlan_addr_any(&ip)) {
887 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
888 if (!rd)
889 goto out;
890 }
891
892 /* remove a destination if it's not the only one on the list,
893 * otherwise destroy the fdb entry
894 */
895 if (rd && !list_is_singular(&f->remotes)) {
896 vxlan_fdb_dst_destroy(vxlan, f, rd);
897 goto out;
898 }
899
900 vxlan_fdb_destroy(vxlan, f);
901
902 out:
903 return 0;
904 }
905
906 /* Delete entry (via netlink) */
907 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
908 struct net_device *dev,
909 const unsigned char *addr, u16 vid)
910 {
911 struct vxlan_dev *vxlan = netdev_priv(dev);
912 union vxlan_addr ip;
913 __be32 src_vni, vni;
914 __be16 port;
915 u32 ifindex;
916 int err;
917
918 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
919 if (err)
920 return err;
921
922 spin_lock_bh(&vxlan->hash_lock);
923 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
924 vid);
925 spin_unlock_bh(&vxlan->hash_lock);
926
927 return err;
928 }
929
930 /* Dump forwarding table */
931 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
932 struct net_device *dev,
933 struct net_device *filter_dev, int *idx)
934 {
935 struct vxlan_dev *vxlan = netdev_priv(dev);
936 unsigned int h;
937 int err = 0;
938
939 for (h = 0; h < FDB_HASH_SIZE; ++h) {
940 struct vxlan_fdb *f;
941
942 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
943 struct vxlan_rdst *rd;
944
945 list_for_each_entry_rcu(rd, &f->remotes, list) {
946 if (*idx < cb->args[2])
947 goto skip;
948
949 err = vxlan_fdb_info(skb, vxlan, f,
950 NETLINK_CB(cb->skb).portid,
951 cb->nlh->nlmsg_seq,
952 RTM_NEWNEIGH,
953 NLM_F_MULTI, rd);
954 if (err < 0)
955 goto out;
956 skip:
957 *idx += 1;
958 }
959 }
960 }
961 out:
962 return err;
963 }
964
965 /* Watch incoming packets to learn mapping between Ethernet address
966 * and Tunnel endpoint.
967 * Return true if packet is bogus and should be dropped.
968 */
969 static bool vxlan_snoop(struct net_device *dev,
970 union vxlan_addr *src_ip, const u8 *src_mac,
971 u32 src_ifindex, __be32 vni)
972 {
973 struct vxlan_dev *vxlan = netdev_priv(dev);
974 struct vxlan_fdb *f;
975 u32 ifindex = 0;
976
977 #if IS_ENABLED(CONFIG_IPV6)
978 if (src_ip->sa.sa_family == AF_INET6 &&
979 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
980 ifindex = src_ifindex;
981 #endif
982
983 f = vxlan_find_mac(vxlan, src_mac, vni);
984 if (likely(f)) {
985 struct vxlan_rdst *rdst = first_remote_rcu(f);
986
987 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
988 rdst->remote_ifindex == ifindex))
989 return false;
990
991 /* Don't migrate static entries, drop packets */
992 if (f->state & (NUD_PERMANENT | NUD_NOARP))
993 return true;
994
995 if (net_ratelimit())
996 netdev_info(dev,
997 "%pM migrated from %pIS to %pIS\n",
998 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
999
1000 rdst->remote_ip = *src_ip;
1001 f->updated = jiffies;
1002 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1003 } else {
1004 /* learned new entry */
1005 spin_lock(&vxlan->hash_lock);
1006
1007 /* close off race between vxlan_flush and incoming packets */
1008 if (netif_running(dev))
1009 vxlan_fdb_create(vxlan, src_mac, src_ip,
1010 NUD_REACHABLE,
1011 NLM_F_EXCL|NLM_F_CREATE,
1012 vxlan->cfg.dst_port,
1013 vni,
1014 vxlan->default_dst.remote_vni,
1015 ifindex, NTF_SELF);
1016 spin_unlock(&vxlan->hash_lock);
1017 }
1018
1019 return false;
1020 }
1021
1022 /* See if multicast group is already in use by other ID */
1023 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1024 {
1025 struct vxlan_dev *vxlan;
1026 struct vxlan_sock *sock4;
1027 #if IS_ENABLED(CONFIG_IPV6)
1028 struct vxlan_sock *sock6;
1029 #endif
1030 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1031
1032 sock4 = rtnl_dereference(dev->vn4_sock);
1033
1034 /* The vxlan_sock is only used by dev, leaving group has
1035 * no effect on other vxlan devices.
1036 */
1037 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1038 return false;
1039 #if IS_ENABLED(CONFIG_IPV6)
1040 sock6 = rtnl_dereference(dev->vn6_sock);
1041 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1042 return false;
1043 #endif
1044
1045 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1046 if (!netif_running(vxlan->dev) || vxlan == dev)
1047 continue;
1048
1049 if (family == AF_INET &&
1050 rtnl_dereference(vxlan->vn4_sock) != sock4)
1051 continue;
1052 #if IS_ENABLED(CONFIG_IPV6)
1053 if (family == AF_INET6 &&
1054 rtnl_dereference(vxlan->vn6_sock) != sock6)
1055 continue;
1056 #endif
1057
1058 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1059 &dev->default_dst.remote_ip))
1060 continue;
1061
1062 if (vxlan->default_dst.remote_ifindex !=
1063 dev->default_dst.remote_ifindex)
1064 continue;
1065
1066 return true;
1067 }
1068
1069 return false;
1070 }
1071
1072 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1073 {
1074 struct vxlan_net *vn;
1075
1076 if (!vs)
1077 return false;
1078 if (!refcount_dec_and_test(&vs->refcnt))
1079 return false;
1080
1081 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1082 spin_lock(&vn->sock_lock);
1083 hlist_del_rcu(&vs->hlist);
1084 udp_tunnel_notify_del_rx_port(vs->sock,
1085 (vs->flags & VXLAN_F_GPE) ?
1086 UDP_TUNNEL_TYPE_VXLAN_GPE :
1087 UDP_TUNNEL_TYPE_VXLAN);
1088 spin_unlock(&vn->sock_lock);
1089
1090 return true;
1091 }
1092
1093 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1094 {
1095 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1096 #if IS_ENABLED(CONFIG_IPV6)
1097 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1098
1099 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1100 #endif
1101
1102 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1103 synchronize_net();
1104
1105 vxlan_vs_del_dev(vxlan);
1106
1107 if (__vxlan_sock_release_prep(sock4)) {
1108 udp_tunnel_sock_release(sock4->sock);
1109 kfree(sock4);
1110 }
1111
1112 #if IS_ENABLED(CONFIG_IPV6)
1113 if (__vxlan_sock_release_prep(sock6)) {
1114 udp_tunnel_sock_release(sock6->sock);
1115 kfree(sock6);
1116 }
1117 #endif
1118 }
1119
1120 /* Update multicast group membership when first VNI on
1121 * multicast address is brought up
1122 */
1123 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1124 {
1125 struct sock *sk;
1126 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1127 int ifindex = vxlan->default_dst.remote_ifindex;
1128 int ret = -EINVAL;
1129
1130 if (ip->sa.sa_family == AF_INET) {
1131 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1132 struct ip_mreqn mreq = {
1133 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1134 .imr_ifindex = ifindex,
1135 };
1136
1137 sk = sock4->sock->sk;
1138 lock_sock(sk);
1139 ret = ip_mc_join_group(sk, &mreq);
1140 release_sock(sk);
1141 #if IS_ENABLED(CONFIG_IPV6)
1142 } else {
1143 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1144
1145 sk = sock6->sock->sk;
1146 lock_sock(sk);
1147 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1148 &ip->sin6.sin6_addr);
1149 release_sock(sk);
1150 #endif
1151 }
1152
1153 return ret;
1154 }
1155
1156 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1157 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1158 {
1159 struct sock *sk;
1160 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1161 int ifindex = vxlan->default_dst.remote_ifindex;
1162 int ret = -EINVAL;
1163
1164 if (ip->sa.sa_family == AF_INET) {
1165 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1166 struct ip_mreqn mreq = {
1167 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1168 .imr_ifindex = ifindex,
1169 };
1170
1171 sk = sock4->sock->sk;
1172 lock_sock(sk);
1173 ret = ip_mc_leave_group(sk, &mreq);
1174 release_sock(sk);
1175 #if IS_ENABLED(CONFIG_IPV6)
1176 } else {
1177 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1178
1179 sk = sock6->sock->sk;
1180 lock_sock(sk);
1181 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1182 &ip->sin6.sin6_addr);
1183 release_sock(sk);
1184 #endif
1185 }
1186
1187 return ret;
1188 }
1189
1190 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1191 struct sk_buff *skb, u32 vxflags)
1192 {
1193 size_t start, offset;
1194
1195 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1196 goto out;
1197
1198 start = vxlan_rco_start(unparsed->vx_vni);
1199 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1200
1201 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1202 return false;
1203
1204 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1205 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1206 out:
1207 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1208 unparsed->vx_vni &= VXLAN_VNI_MASK;
1209 return true;
1210 }
1211
1212 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1213 struct sk_buff *skb, u32 vxflags,
1214 struct vxlan_metadata *md)
1215 {
1216 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1217 struct metadata_dst *tun_dst;
1218
1219 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1220 goto out;
1221
1222 md->gbp = ntohs(gbp->policy_id);
1223
1224 tun_dst = (struct metadata_dst *)skb_dst(skb);
1225 if (tun_dst) {
1226 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1227 tun_dst->u.tun_info.options_len = sizeof(*md);
1228 }
1229 if (gbp->dont_learn)
1230 md->gbp |= VXLAN_GBP_DONT_LEARN;
1231
1232 if (gbp->policy_applied)
1233 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1234
1235 /* In flow-based mode, GBP is carried in dst_metadata */
1236 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1237 skb->mark = md->gbp;
1238 out:
1239 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1240 }
1241
1242 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1243 __be16 *protocol,
1244 struct sk_buff *skb, u32 vxflags)
1245 {
1246 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1247
1248 /* Need to have Next Protocol set for interfaces in GPE mode. */
1249 if (!gpe->np_applied)
1250 return false;
1251 /* "The initial version is 0. If a receiver does not support the
1252 * version indicated it MUST drop the packet.
1253 */
1254 if (gpe->version != 0)
1255 return false;
1256 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1257 * processing MUST occur." However, we don't implement OAM
1258 * processing, thus drop the packet.
1259 */
1260 if (gpe->oam_flag)
1261 return false;
1262
1263 switch (gpe->next_protocol) {
1264 case VXLAN_GPE_NP_IPV4:
1265 *protocol = htons(ETH_P_IP);
1266 break;
1267 case VXLAN_GPE_NP_IPV6:
1268 *protocol = htons(ETH_P_IPV6);
1269 break;
1270 case VXLAN_GPE_NP_ETHERNET:
1271 *protocol = htons(ETH_P_TEB);
1272 break;
1273 default:
1274 return false;
1275 }
1276
1277 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1278 return true;
1279 }
1280
1281 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1282 struct vxlan_sock *vs,
1283 struct sk_buff *skb, __be32 vni)
1284 {
1285 union vxlan_addr saddr;
1286 u32 ifindex = skb->dev->ifindex;
1287
1288 skb_reset_mac_header(skb);
1289 skb->protocol = eth_type_trans(skb, vxlan->dev);
1290 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1291
1292 /* Ignore packet loops (and multicast echo) */
1293 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1294 return false;
1295
1296 /* Get address from the outer IP header */
1297 if (vxlan_get_sk_family(vs) == AF_INET) {
1298 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1299 saddr.sa.sa_family = AF_INET;
1300 #if IS_ENABLED(CONFIG_IPV6)
1301 } else {
1302 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1303 saddr.sa.sa_family = AF_INET6;
1304 #endif
1305 }
1306
1307 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1308 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1309 return false;
1310
1311 return true;
1312 }
1313
1314 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1315 struct sk_buff *skb)
1316 {
1317 int err = 0;
1318
1319 if (vxlan_get_sk_family(vs) == AF_INET)
1320 err = IP_ECN_decapsulate(oiph, skb);
1321 #if IS_ENABLED(CONFIG_IPV6)
1322 else
1323 err = IP6_ECN_decapsulate(oiph, skb);
1324 #endif
1325
1326 if (unlikely(err) && log_ecn_error) {
1327 if (vxlan_get_sk_family(vs) == AF_INET)
1328 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1329 &((struct iphdr *)oiph)->saddr,
1330 ((struct iphdr *)oiph)->tos);
1331 else
1332 net_info_ratelimited("non-ECT from %pI6\n",
1333 &((struct ipv6hdr *)oiph)->saddr);
1334 }
1335 return err <= 1;
1336 }
1337
1338 /* Callback from net/ipv4/udp.c to receive packets */
1339 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1340 {
1341 struct pcpu_sw_netstats *stats;
1342 struct vxlan_dev *vxlan;
1343 struct vxlan_sock *vs;
1344 struct vxlanhdr unparsed;
1345 struct vxlan_metadata _md;
1346 struct vxlan_metadata *md = &_md;
1347 __be16 protocol = htons(ETH_P_TEB);
1348 bool raw_proto = false;
1349 void *oiph;
1350 __be32 vni = 0;
1351
1352 /* Need UDP and VXLAN header to be present */
1353 if (!pskb_may_pull(skb, VXLAN_HLEN))
1354 goto drop;
1355
1356 unparsed = *vxlan_hdr(skb);
1357 /* VNI flag always required to be set */
1358 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1359 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1360 ntohl(vxlan_hdr(skb)->vx_flags),
1361 ntohl(vxlan_hdr(skb)->vx_vni));
1362 /* Return non vxlan pkt */
1363 goto drop;
1364 }
1365 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1366 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1367
1368 vs = rcu_dereference_sk_user_data(sk);
1369 if (!vs)
1370 goto drop;
1371
1372 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1373
1374 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1375 if (!vxlan)
1376 goto drop;
1377
1378 /* For backwards compatibility, only allow reserved fields to be
1379 * used by VXLAN extensions if explicitly requested.
1380 */
1381 if (vs->flags & VXLAN_F_GPE) {
1382 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1383 goto drop;
1384 raw_proto = true;
1385 }
1386
1387 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1388 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1389 goto drop;
1390
1391 if (vxlan_collect_metadata(vs)) {
1392 struct metadata_dst *tun_dst;
1393
1394 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1395 key32_to_tunnel_id(vni), sizeof(*md));
1396
1397 if (!tun_dst)
1398 goto drop;
1399
1400 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1401
1402 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1403 } else {
1404 memset(md, 0, sizeof(*md));
1405 }
1406
1407 if (vs->flags & VXLAN_F_REMCSUM_RX)
1408 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1409 goto drop;
1410 if (vs->flags & VXLAN_F_GBP)
1411 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1412 /* Note that GBP and GPE can never be active together. This is
1413 * ensured in vxlan_dev_configure.
1414 */
1415
1416 if (unparsed.vx_flags || unparsed.vx_vni) {
1417 /* If there are any unprocessed flags remaining treat
1418 * this as a malformed packet. This behavior diverges from
1419 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1420 * in reserved fields are to be ignored. The approach here
1421 * maintains compatibility with previous stack code, and also
1422 * is more robust and provides a little more security in
1423 * adding extensions to VXLAN.
1424 */
1425 goto drop;
1426 }
1427
1428 if (!raw_proto) {
1429 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1430 goto drop;
1431 } else {
1432 skb_reset_mac_header(skb);
1433 skb->dev = vxlan->dev;
1434 skb->pkt_type = PACKET_HOST;
1435 }
1436
1437 oiph = skb_network_header(skb);
1438 skb_reset_network_header(skb);
1439
1440 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1441 ++vxlan->dev->stats.rx_frame_errors;
1442 ++vxlan->dev->stats.rx_errors;
1443 goto drop;
1444 }
1445
1446 stats = this_cpu_ptr(vxlan->dev->tstats);
1447 u64_stats_update_begin(&stats->syncp);
1448 stats->rx_packets++;
1449 stats->rx_bytes += skb->len;
1450 u64_stats_update_end(&stats->syncp);
1451
1452 gro_cells_receive(&vxlan->gro_cells, skb);
1453 return 0;
1454
1455 drop:
1456 /* Consume bad packet */
1457 kfree_skb(skb);
1458 return 0;
1459 }
1460
1461 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1462 {
1463 struct vxlan_dev *vxlan = netdev_priv(dev);
1464 struct arphdr *parp;
1465 u8 *arpptr, *sha;
1466 __be32 sip, tip;
1467 struct neighbour *n;
1468
1469 if (dev->flags & IFF_NOARP)
1470 goto out;
1471
1472 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1473 dev->stats.tx_dropped++;
1474 goto out;
1475 }
1476 parp = arp_hdr(skb);
1477
1478 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1479 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1480 parp->ar_pro != htons(ETH_P_IP) ||
1481 parp->ar_op != htons(ARPOP_REQUEST) ||
1482 parp->ar_hln != dev->addr_len ||
1483 parp->ar_pln != 4)
1484 goto out;
1485 arpptr = (u8 *)parp + sizeof(struct arphdr);
1486 sha = arpptr;
1487 arpptr += dev->addr_len; /* sha */
1488 memcpy(&sip, arpptr, sizeof(sip));
1489 arpptr += sizeof(sip);
1490 arpptr += dev->addr_len; /* tha */
1491 memcpy(&tip, arpptr, sizeof(tip));
1492
1493 if (ipv4_is_loopback(tip) ||
1494 ipv4_is_multicast(tip))
1495 goto out;
1496
1497 n = neigh_lookup(&arp_tbl, &tip, dev);
1498
1499 if (n) {
1500 struct vxlan_fdb *f;
1501 struct sk_buff *reply;
1502
1503 if (!(n->nud_state & NUD_CONNECTED)) {
1504 neigh_release(n);
1505 goto out;
1506 }
1507
1508 f = vxlan_find_mac(vxlan, n->ha, vni);
1509 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1510 /* bridge-local neighbor */
1511 neigh_release(n);
1512 goto out;
1513 }
1514
1515 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1516 n->ha, sha);
1517
1518 neigh_release(n);
1519
1520 if (reply == NULL)
1521 goto out;
1522
1523 skb_reset_mac_header(reply);
1524 __skb_pull(reply, skb_network_offset(reply));
1525 reply->ip_summed = CHECKSUM_UNNECESSARY;
1526 reply->pkt_type = PACKET_HOST;
1527
1528 if (netif_rx_ni(reply) == NET_RX_DROP)
1529 dev->stats.rx_dropped++;
1530 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1531 union vxlan_addr ipa = {
1532 .sin.sin_addr.s_addr = tip,
1533 .sin.sin_family = AF_INET,
1534 };
1535
1536 vxlan_ip_miss(dev, &ipa);
1537 }
1538 out:
1539 consume_skb(skb);
1540 return NETDEV_TX_OK;
1541 }
1542
1543 #if IS_ENABLED(CONFIG_IPV6)
1544 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1545 struct neighbour *n, bool isrouter)
1546 {
1547 struct net_device *dev = request->dev;
1548 struct sk_buff *reply;
1549 struct nd_msg *ns, *na;
1550 struct ipv6hdr *pip6;
1551 u8 *daddr;
1552 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1553 int ns_olen;
1554 int i, len;
1555
1556 if (dev == NULL || !pskb_may_pull(request, request->len))
1557 return NULL;
1558
1559 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1560 sizeof(*na) + na_olen + dev->needed_tailroom;
1561 reply = alloc_skb(len, GFP_ATOMIC);
1562 if (reply == NULL)
1563 return NULL;
1564
1565 reply->protocol = htons(ETH_P_IPV6);
1566 reply->dev = dev;
1567 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1568 skb_push(reply, sizeof(struct ethhdr));
1569 skb_reset_mac_header(reply);
1570
1571 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1572
1573 daddr = eth_hdr(request)->h_source;
1574 ns_olen = request->len - skb_network_offset(request) -
1575 sizeof(struct ipv6hdr) - sizeof(*ns);
1576 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1577 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1578 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1579 break;
1580 }
1581 }
1582
1583 /* Ethernet header */
1584 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1585 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1586 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1587 reply->protocol = htons(ETH_P_IPV6);
1588
1589 skb_pull(reply, sizeof(struct ethhdr));
1590 skb_reset_network_header(reply);
1591 skb_put(reply, sizeof(struct ipv6hdr));
1592
1593 /* IPv6 header */
1594
1595 pip6 = ipv6_hdr(reply);
1596 memset(pip6, 0, sizeof(struct ipv6hdr));
1597 pip6->version = 6;
1598 pip6->priority = ipv6_hdr(request)->priority;
1599 pip6->nexthdr = IPPROTO_ICMPV6;
1600 pip6->hop_limit = 255;
1601 pip6->daddr = ipv6_hdr(request)->saddr;
1602 pip6->saddr = *(struct in6_addr *)n->primary_key;
1603
1604 skb_pull(reply, sizeof(struct ipv6hdr));
1605 skb_reset_transport_header(reply);
1606
1607 /* Neighbor Advertisement */
1608 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1609 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1610 na->icmph.icmp6_router = isrouter;
1611 na->icmph.icmp6_override = 1;
1612 na->icmph.icmp6_solicited = 1;
1613 na->target = ns->target;
1614 ether_addr_copy(&na->opt[2], n->ha);
1615 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1616 na->opt[1] = na_olen >> 3;
1617
1618 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1619 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1620 csum_partial(na, sizeof(*na)+na_olen, 0));
1621
1622 pip6->payload_len = htons(sizeof(*na)+na_olen);
1623
1624 skb_push(reply, sizeof(struct ipv6hdr));
1625
1626 reply->ip_summed = CHECKSUM_UNNECESSARY;
1627
1628 return reply;
1629 }
1630
1631 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1632 {
1633 struct vxlan_dev *vxlan = netdev_priv(dev);
1634 struct nd_msg *msg;
1635 const struct ipv6hdr *iphdr;
1636 const struct in6_addr *daddr;
1637 struct neighbour *n;
1638 struct inet6_dev *in6_dev;
1639
1640 in6_dev = __in6_dev_get(dev);
1641 if (!in6_dev)
1642 goto out;
1643
1644 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
1645 goto out;
1646
1647 iphdr = ipv6_hdr(skb);
1648 daddr = &iphdr->daddr;
1649
1650 msg = (struct nd_msg *)(iphdr + 1);
1651 if (msg->icmph.icmp6_code != 0 ||
1652 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1653 goto out;
1654
1655 if (ipv6_addr_loopback(daddr) ||
1656 ipv6_addr_is_multicast(&msg->target))
1657 goto out;
1658
1659 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1660
1661 if (n) {
1662 struct vxlan_fdb *f;
1663 struct sk_buff *reply;
1664
1665 if (!(n->nud_state & NUD_CONNECTED)) {
1666 neigh_release(n);
1667 goto out;
1668 }
1669
1670 f = vxlan_find_mac(vxlan, n->ha, vni);
1671 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1672 /* bridge-local neighbor */
1673 neigh_release(n);
1674 goto out;
1675 }
1676
1677 reply = vxlan_na_create(skb, n,
1678 !!(f ? f->flags & NTF_ROUTER : 0));
1679
1680 neigh_release(n);
1681
1682 if (reply == NULL)
1683 goto out;
1684
1685 if (netif_rx_ni(reply) == NET_RX_DROP)
1686 dev->stats.rx_dropped++;
1687
1688 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1689 union vxlan_addr ipa = {
1690 .sin6.sin6_addr = msg->target,
1691 .sin6.sin6_family = AF_INET6,
1692 };
1693
1694 vxlan_ip_miss(dev, &ipa);
1695 }
1696
1697 out:
1698 consume_skb(skb);
1699 return NETDEV_TX_OK;
1700 }
1701 #endif
1702
1703 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1704 {
1705 struct vxlan_dev *vxlan = netdev_priv(dev);
1706 struct neighbour *n;
1707
1708 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1709 return false;
1710
1711 n = NULL;
1712 switch (ntohs(eth_hdr(skb)->h_proto)) {
1713 case ETH_P_IP:
1714 {
1715 struct iphdr *pip;
1716
1717 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1718 return false;
1719 pip = ip_hdr(skb);
1720 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1721 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1722 union vxlan_addr ipa = {
1723 .sin.sin_addr.s_addr = pip->daddr,
1724 .sin.sin_family = AF_INET,
1725 };
1726
1727 vxlan_ip_miss(dev, &ipa);
1728 return false;
1729 }
1730
1731 break;
1732 }
1733 #if IS_ENABLED(CONFIG_IPV6)
1734 case ETH_P_IPV6:
1735 {
1736 struct ipv6hdr *pip6;
1737
1738 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1739 return false;
1740 pip6 = ipv6_hdr(skb);
1741 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1742 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1743 union vxlan_addr ipa = {
1744 .sin6.sin6_addr = pip6->daddr,
1745 .sin6.sin6_family = AF_INET6,
1746 };
1747
1748 vxlan_ip_miss(dev, &ipa);
1749 return false;
1750 }
1751
1752 break;
1753 }
1754 #endif
1755 default:
1756 return false;
1757 }
1758
1759 if (n) {
1760 bool diff;
1761
1762 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1763 if (diff) {
1764 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1765 dev->addr_len);
1766 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1767 }
1768 neigh_release(n);
1769 return diff;
1770 }
1771
1772 return false;
1773 }
1774
1775 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1776 struct vxlan_metadata *md)
1777 {
1778 struct vxlanhdr_gbp *gbp;
1779
1780 if (!md->gbp)
1781 return;
1782
1783 gbp = (struct vxlanhdr_gbp *)vxh;
1784 vxh->vx_flags |= VXLAN_HF_GBP;
1785
1786 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1787 gbp->dont_learn = 1;
1788
1789 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1790 gbp->policy_applied = 1;
1791
1792 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1793 }
1794
1795 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1796 __be16 protocol)
1797 {
1798 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1799
1800 gpe->np_applied = 1;
1801
1802 switch (protocol) {
1803 case htons(ETH_P_IP):
1804 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1805 return 0;
1806 case htons(ETH_P_IPV6):
1807 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1808 return 0;
1809 case htons(ETH_P_TEB):
1810 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1811 return 0;
1812 }
1813 return -EPFNOSUPPORT;
1814 }
1815
1816 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1817 int iphdr_len, __be32 vni,
1818 struct vxlan_metadata *md, u32 vxflags,
1819 bool udp_sum)
1820 {
1821 struct vxlanhdr *vxh;
1822 int min_headroom;
1823 int err;
1824 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1825 __be16 inner_protocol = htons(ETH_P_TEB);
1826
1827 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1828 skb->ip_summed == CHECKSUM_PARTIAL) {
1829 int csum_start = skb_checksum_start_offset(skb);
1830
1831 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1832 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1833 (skb->csum_offset == offsetof(struct udphdr, check) ||
1834 skb->csum_offset == offsetof(struct tcphdr, check)))
1835 type |= SKB_GSO_TUNNEL_REMCSUM;
1836 }
1837
1838 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1839 + VXLAN_HLEN + iphdr_len;
1840
1841 /* Need space for new headers (invalidates iph ptr) */
1842 err = skb_cow_head(skb, min_headroom);
1843 if (unlikely(err))
1844 return err;
1845
1846 err = iptunnel_handle_offloads(skb, type);
1847 if (err)
1848 return err;
1849
1850 vxh = __skb_push(skb, sizeof(*vxh));
1851 vxh->vx_flags = VXLAN_HF_VNI;
1852 vxh->vx_vni = vxlan_vni_field(vni);
1853
1854 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1855 unsigned int start;
1856
1857 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1858 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1859 vxh->vx_flags |= VXLAN_HF_RCO;
1860
1861 if (!skb_is_gso(skb)) {
1862 skb->ip_summed = CHECKSUM_NONE;
1863 skb->encapsulation = 0;
1864 }
1865 }
1866
1867 if (vxflags & VXLAN_F_GBP)
1868 vxlan_build_gbp_hdr(vxh, vxflags, md);
1869 if (vxflags & VXLAN_F_GPE) {
1870 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1871 if (err < 0)
1872 return err;
1873 inner_protocol = skb->protocol;
1874 }
1875
1876 skb_set_inner_protocol(skb, inner_protocol);
1877 return 0;
1878 }
1879
1880 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1881 struct vxlan_sock *sock4,
1882 struct sk_buff *skb, int oif, u8 tos,
1883 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1884 struct dst_cache *dst_cache,
1885 const struct ip_tunnel_info *info)
1886 {
1887 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1888 struct rtable *rt = NULL;
1889 struct flowi4 fl4;
1890
1891 if (!sock4)
1892 return ERR_PTR(-EIO);
1893
1894 if (tos && !info)
1895 use_cache = false;
1896 if (use_cache) {
1897 rt = dst_cache_get_ip4(dst_cache, saddr);
1898 if (rt)
1899 return rt;
1900 }
1901
1902 memset(&fl4, 0, sizeof(fl4));
1903 fl4.flowi4_oif = oif;
1904 fl4.flowi4_tos = RT_TOS(tos);
1905 fl4.flowi4_mark = skb->mark;
1906 fl4.flowi4_proto = IPPROTO_UDP;
1907 fl4.daddr = daddr;
1908 fl4.saddr = *saddr;
1909 fl4.fl4_dport = dport;
1910 fl4.fl4_sport = sport;
1911
1912 rt = ip_route_output_key(vxlan->net, &fl4);
1913 if (likely(!IS_ERR(rt))) {
1914 if (rt->dst.dev == dev) {
1915 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1916 ip_rt_put(rt);
1917 return ERR_PTR(-ELOOP);
1918 }
1919
1920 *saddr = fl4.saddr;
1921 if (use_cache)
1922 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1923 } else {
1924 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1925 return ERR_PTR(-ENETUNREACH);
1926 }
1927 return rt;
1928 }
1929
1930 #if IS_ENABLED(CONFIG_IPV6)
1931 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1932 struct net_device *dev,
1933 struct vxlan_sock *sock6,
1934 struct sk_buff *skb, int oif, u8 tos,
1935 __be32 label,
1936 const struct in6_addr *daddr,
1937 struct in6_addr *saddr,
1938 __be16 dport, __be16 sport,
1939 struct dst_cache *dst_cache,
1940 const struct ip_tunnel_info *info)
1941 {
1942 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1943 struct dst_entry *ndst;
1944 struct flowi6 fl6;
1945 int err;
1946
1947 if (!sock6)
1948 return ERR_PTR(-EIO);
1949
1950 if (tos && !info)
1951 use_cache = false;
1952 if (use_cache) {
1953 ndst = dst_cache_get_ip6(dst_cache, saddr);
1954 if (ndst)
1955 return ndst;
1956 }
1957
1958 memset(&fl6, 0, sizeof(fl6));
1959 fl6.flowi6_oif = oif;
1960 fl6.daddr = *daddr;
1961 fl6.saddr = *saddr;
1962 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1963 fl6.flowi6_mark = skb->mark;
1964 fl6.flowi6_proto = IPPROTO_UDP;
1965 fl6.fl6_dport = dport;
1966 fl6.fl6_sport = sport;
1967
1968 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1969 sock6->sock->sk,
1970 &ndst, &fl6);
1971 if (unlikely(err < 0)) {
1972 netdev_dbg(dev, "no route to %pI6\n", daddr);
1973 return ERR_PTR(-ENETUNREACH);
1974 }
1975
1976 if (unlikely(ndst->dev == dev)) {
1977 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1978 dst_release(ndst);
1979 return ERR_PTR(-ELOOP);
1980 }
1981
1982 *saddr = fl6.saddr;
1983 if (use_cache)
1984 dst_cache_set_ip6(dst_cache, ndst, saddr);
1985 return ndst;
1986 }
1987 #endif
1988
1989 /* Bypass encapsulation if the destination is local */
1990 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1991 struct vxlan_dev *dst_vxlan, __be32 vni)
1992 {
1993 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1994 union vxlan_addr loopback;
1995 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1996 struct net_device *dev = skb->dev;
1997 int len = skb->len;
1998
1999 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2000 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2001 skb->pkt_type = PACKET_HOST;
2002 skb->encapsulation = 0;
2003 skb->dev = dst_vxlan->dev;
2004 __skb_pull(skb, skb_network_offset(skb));
2005
2006 if (remote_ip->sa.sa_family == AF_INET) {
2007 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2008 loopback.sa.sa_family = AF_INET;
2009 #if IS_ENABLED(CONFIG_IPV6)
2010 } else {
2011 loopback.sin6.sin6_addr = in6addr_loopback;
2012 loopback.sa.sa_family = AF_INET6;
2013 #endif
2014 }
2015
2016 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2017 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2018 vni);
2019
2020 u64_stats_update_begin(&tx_stats->syncp);
2021 tx_stats->tx_packets++;
2022 tx_stats->tx_bytes += len;
2023 u64_stats_update_end(&tx_stats->syncp);
2024
2025 if (netif_rx(skb) == NET_RX_SUCCESS) {
2026 u64_stats_update_begin(&rx_stats->syncp);
2027 rx_stats->rx_packets++;
2028 rx_stats->rx_bytes += len;
2029 u64_stats_update_end(&rx_stats->syncp);
2030 } else {
2031 dev->stats.rx_dropped++;
2032 }
2033 }
2034
2035 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2036 struct vxlan_dev *vxlan,
2037 union vxlan_addr *daddr,
2038 __be16 dst_port, int dst_ifindex, __be32 vni,
2039 struct dst_entry *dst,
2040 u32 rt_flags)
2041 {
2042 #if IS_ENABLED(CONFIG_IPV6)
2043 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2044 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2045 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2046 */
2047 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2048 #endif
2049 /* Bypass encapsulation if the destination is local */
2050 if (rt_flags & RTCF_LOCAL &&
2051 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2052 struct vxlan_dev *dst_vxlan;
2053
2054 dst_release(dst);
2055 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2056 daddr->sa.sa_family, dst_port,
2057 vxlan->cfg.flags);
2058 if (!dst_vxlan) {
2059 dev->stats.tx_errors++;
2060 kfree_skb(skb);
2061
2062 return -ENOENT;
2063 }
2064 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2065 return 1;
2066 }
2067
2068 return 0;
2069 }
2070
2071 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2072 __be32 default_vni, struct vxlan_rdst *rdst,
2073 bool did_rsc)
2074 {
2075 struct dst_cache *dst_cache;
2076 struct ip_tunnel_info *info;
2077 struct vxlan_dev *vxlan = netdev_priv(dev);
2078 const struct iphdr *old_iph = ip_hdr(skb);
2079 union vxlan_addr *dst;
2080 union vxlan_addr remote_ip, local_ip;
2081 struct vxlan_metadata _md;
2082 struct vxlan_metadata *md = &_md;
2083 __be16 src_port = 0, dst_port;
2084 struct dst_entry *ndst = NULL;
2085 __be32 vni, label;
2086 __u8 tos, ttl;
2087 int ifindex;
2088 int err;
2089 u32 flags = vxlan->cfg.flags;
2090 bool udp_sum = false;
2091 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2092
2093 info = skb_tunnel_info(skb);
2094
2095 if (rdst) {
2096 dst = &rdst->remote_ip;
2097 if (vxlan_addr_any(dst)) {
2098 if (did_rsc) {
2099 /* short-circuited back to local bridge */
2100 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2101 return;
2102 }
2103 goto drop;
2104 }
2105
2106 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2107 vni = (rdst->remote_vni) ? : default_vni;
2108 ifindex = rdst->remote_ifindex;
2109 local_ip = vxlan->cfg.saddr;
2110 dst_cache = &rdst->dst_cache;
2111 md->gbp = skb->mark;
2112 ttl = vxlan->cfg.ttl;
2113 if (!ttl && vxlan_addr_multicast(dst))
2114 ttl = 1;
2115
2116 tos = vxlan->cfg.tos;
2117 if (tos == 1)
2118 tos = ip_tunnel_get_dsfield(old_iph, skb);
2119
2120 if (dst->sa.sa_family == AF_INET)
2121 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2122 else
2123 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2124 label = vxlan->cfg.label;
2125 } else {
2126 if (!info) {
2127 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2128 dev->name);
2129 goto drop;
2130 }
2131 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2132 if (remote_ip.sa.sa_family == AF_INET) {
2133 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2134 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2135 } else {
2136 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2137 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2138 }
2139 dst = &remote_ip;
2140 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2141 vni = tunnel_id_to_key32(info->key.tun_id);
2142 ifindex = 0;
2143 dst_cache = &info->dst_cache;
2144 if (info->options_len)
2145 md = ip_tunnel_info_opts(info);
2146 ttl = info->key.ttl;
2147 tos = info->key.tos;
2148 label = info->key.label;
2149 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2150 }
2151 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2152 vxlan->cfg.port_max, true);
2153
2154 rcu_read_lock();
2155 if (dst->sa.sa_family == AF_INET) {
2156 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2157 struct rtable *rt;
2158 __be16 df = 0;
2159
2160 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2161 dst->sin.sin_addr.s_addr,
2162 &local_ip.sin.sin_addr.s_addr,
2163 dst_port, src_port,
2164 dst_cache, info);
2165 if (IS_ERR(rt)) {
2166 err = PTR_ERR(rt);
2167 goto tx_error;
2168 }
2169
2170 /* Bypass encapsulation if the destination is local */
2171 if (!info) {
2172 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2173 dst_port, ifindex, vni,
2174 &rt->dst, rt->rt_flags);
2175 if (err)
2176 goto out_unlock;
2177 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2178 df = htons(IP_DF);
2179 }
2180
2181 ndst = &rt->dst;
2182 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2183 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2184 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2185 vni, md, flags, udp_sum);
2186 if (err < 0)
2187 goto tx_error;
2188
2189 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2190 dst->sin.sin_addr.s_addr, tos, ttl, df,
2191 src_port, dst_port, xnet, !udp_sum);
2192 #if IS_ENABLED(CONFIG_IPV6)
2193 } else {
2194 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2195
2196 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2197 label, &dst->sin6.sin6_addr,
2198 &local_ip.sin6.sin6_addr,
2199 dst_port, src_port,
2200 dst_cache, info);
2201 if (IS_ERR(ndst)) {
2202 err = PTR_ERR(ndst);
2203 ndst = NULL;
2204 goto tx_error;
2205 }
2206
2207 if (!info) {
2208 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2209
2210 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2211 dst_port, ifindex, vni,
2212 ndst, rt6i_flags);
2213 if (err)
2214 goto out_unlock;
2215 }
2216
2217 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2218 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2219 skb_scrub_packet(skb, xnet);
2220 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2221 vni, md, flags, udp_sum);
2222 if (err < 0)
2223 goto tx_error;
2224
2225 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2226 &local_ip.sin6.sin6_addr,
2227 &dst->sin6.sin6_addr, tos, ttl,
2228 label, src_port, dst_port, !udp_sum);
2229 #endif
2230 }
2231 out_unlock:
2232 rcu_read_unlock();
2233 return;
2234
2235 drop:
2236 dev->stats.tx_dropped++;
2237 dev_kfree_skb(skb);
2238 return;
2239
2240 tx_error:
2241 rcu_read_unlock();
2242 if (err == -ELOOP)
2243 dev->stats.collisions++;
2244 else if (err == -ENETUNREACH)
2245 dev->stats.tx_carrier_errors++;
2246 dst_release(ndst);
2247 dev->stats.tx_errors++;
2248 kfree_skb(skb);
2249 }
2250
2251 /* Transmit local packets over Vxlan
2252 *
2253 * Outer IP header inherits ECN and DF from inner header.
2254 * Outer UDP destination is the VXLAN assigned port.
2255 * source port is based on hash of flow
2256 */
2257 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2258 {
2259 struct vxlan_dev *vxlan = netdev_priv(dev);
2260 const struct ip_tunnel_info *info;
2261 struct ethhdr *eth;
2262 bool did_rsc = false;
2263 struct vxlan_rdst *rdst, *fdst = NULL;
2264 struct vxlan_fdb *f;
2265 __be32 vni = 0;
2266
2267 info = skb_tunnel_info(skb);
2268
2269 skb_reset_mac_header(skb);
2270
2271 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2272 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2273 info->mode & IP_TUNNEL_INFO_TX) {
2274 vni = tunnel_id_to_key32(info->key.tun_id);
2275 } else {
2276 if (info && info->mode & IP_TUNNEL_INFO_TX)
2277 vxlan_xmit_one(skb, dev, vni, NULL, false);
2278 else
2279 kfree_skb(skb);
2280 return NETDEV_TX_OK;
2281 }
2282 }
2283
2284 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2285 eth = eth_hdr(skb);
2286 if (ntohs(eth->h_proto) == ETH_P_ARP)
2287 return arp_reduce(dev, skb, vni);
2288 #if IS_ENABLED(CONFIG_IPV6)
2289 else if (ntohs(eth->h_proto) == ETH_P_IPV6) {
2290 struct ipv6hdr *hdr, _hdr;
2291 if ((hdr = skb_header_pointer(skb,
2292 skb_network_offset(skb),
2293 sizeof(_hdr), &_hdr)) &&
2294 hdr->nexthdr == IPPROTO_ICMPV6)
2295 return neigh_reduce(dev, skb, vni);
2296 }
2297 #endif
2298 }
2299
2300 eth = eth_hdr(skb);
2301 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2302 did_rsc = false;
2303
2304 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2305 (ntohs(eth->h_proto) == ETH_P_IP ||
2306 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2307 did_rsc = route_shortcircuit(dev, skb);
2308 if (did_rsc)
2309 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2310 }
2311
2312 if (f == NULL) {
2313 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2314 if (f == NULL) {
2315 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2316 !is_multicast_ether_addr(eth->h_dest))
2317 vxlan_fdb_miss(vxlan, eth->h_dest);
2318
2319 dev->stats.tx_dropped++;
2320 kfree_skb(skb);
2321 return NETDEV_TX_OK;
2322 }
2323 }
2324
2325 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2326 struct sk_buff *skb1;
2327
2328 if (!fdst) {
2329 fdst = rdst;
2330 continue;
2331 }
2332 skb1 = skb_clone(skb, GFP_ATOMIC);
2333 if (skb1)
2334 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2335 }
2336
2337 if (fdst)
2338 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2339 else
2340 kfree_skb(skb);
2341 return NETDEV_TX_OK;
2342 }
2343
2344 /* Walk the forwarding table and purge stale entries */
2345 static void vxlan_cleanup(unsigned long arg)
2346 {
2347 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2348 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2349 unsigned int h;
2350
2351 if (!netif_running(vxlan->dev))
2352 return;
2353
2354 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2355 struct hlist_node *p, *n;
2356
2357 spin_lock_bh(&vxlan->hash_lock);
2358 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2359 struct vxlan_fdb *f
2360 = container_of(p, struct vxlan_fdb, hlist);
2361 unsigned long timeout;
2362
2363 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2364 continue;
2365
2366 if (f->flags & NTF_EXT_LEARNED)
2367 continue;
2368
2369 timeout = f->used + vxlan->cfg.age_interval * HZ;
2370 if (time_before_eq(timeout, jiffies)) {
2371 netdev_dbg(vxlan->dev,
2372 "garbage collect %pM\n",
2373 f->eth_addr);
2374 f->state = NUD_STALE;
2375 vxlan_fdb_destroy(vxlan, f);
2376 } else if (time_before(timeout, next_timer))
2377 next_timer = timeout;
2378 }
2379 spin_unlock_bh(&vxlan->hash_lock);
2380 }
2381
2382 mod_timer(&vxlan->age_timer, next_timer);
2383 }
2384
2385 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2386 {
2387 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2388
2389 spin_lock(&vn->sock_lock);
2390 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2391 #if IS_ENABLED(CONFIG_IPV6)
2392 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2393 #endif
2394 spin_unlock(&vn->sock_lock);
2395 }
2396
2397 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2398 struct vxlan_dev_node *node)
2399 {
2400 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2401 __be32 vni = vxlan->default_dst.remote_vni;
2402
2403 node->vxlan = vxlan;
2404 spin_lock(&vn->sock_lock);
2405 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2406 spin_unlock(&vn->sock_lock);
2407 }
2408
2409 /* Setup stats when device is created */
2410 static int vxlan_init(struct net_device *dev)
2411 {
2412 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2413 if (!dev->tstats)
2414 return -ENOMEM;
2415
2416 return 0;
2417 }
2418
2419 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2420 {
2421 struct vxlan_fdb *f;
2422
2423 spin_lock_bh(&vxlan->hash_lock);
2424 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2425 if (f)
2426 vxlan_fdb_destroy(vxlan, f);
2427 spin_unlock_bh(&vxlan->hash_lock);
2428 }
2429
2430 static void vxlan_uninit(struct net_device *dev)
2431 {
2432 struct vxlan_dev *vxlan = netdev_priv(dev);
2433
2434 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2435
2436 free_percpu(dev->tstats);
2437 }
2438
2439 /* Start ageing timer and join group when device is brought up */
2440 static int vxlan_open(struct net_device *dev)
2441 {
2442 struct vxlan_dev *vxlan = netdev_priv(dev);
2443 int ret;
2444
2445 ret = vxlan_sock_add(vxlan);
2446 if (ret < 0)
2447 return ret;
2448
2449 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2450 ret = vxlan_igmp_join(vxlan);
2451 if (ret == -EADDRINUSE)
2452 ret = 0;
2453 if (ret) {
2454 vxlan_sock_release(vxlan);
2455 return ret;
2456 }
2457 }
2458
2459 if (vxlan->cfg.age_interval)
2460 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2461
2462 return ret;
2463 }
2464
2465 /* Purge the forwarding table */
2466 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2467 {
2468 unsigned int h;
2469
2470 spin_lock_bh(&vxlan->hash_lock);
2471 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2472 struct hlist_node *p, *n;
2473 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2474 struct vxlan_fdb *f
2475 = container_of(p, struct vxlan_fdb, hlist);
2476 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2477 continue;
2478 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2479 if (!is_zero_ether_addr(f->eth_addr))
2480 vxlan_fdb_destroy(vxlan, f);
2481 }
2482 }
2483 spin_unlock_bh(&vxlan->hash_lock);
2484 }
2485
2486 /* Cleanup timer and forwarding table on shutdown */
2487 static int vxlan_stop(struct net_device *dev)
2488 {
2489 struct vxlan_dev *vxlan = netdev_priv(dev);
2490 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2491 int ret = 0;
2492
2493 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2494 !vxlan_group_used(vn, vxlan))
2495 ret = vxlan_igmp_leave(vxlan);
2496
2497 del_timer_sync(&vxlan->age_timer);
2498
2499 vxlan_flush(vxlan, false);
2500 vxlan_sock_release(vxlan);
2501
2502 return ret;
2503 }
2504
2505 /* Stub, nothing needs to be done. */
2506 static void vxlan_set_multicast_list(struct net_device *dev)
2507 {
2508 }
2509
2510 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2511 {
2512 struct vxlan_dev *vxlan = netdev_priv(dev);
2513 struct vxlan_rdst *dst = &vxlan->default_dst;
2514 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2515 dst->remote_ifindex);
2516 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2517
2518 /* This check is different than dev->max_mtu, because it looks at
2519 * the lowerdev->mtu, rather than the static dev->max_mtu
2520 */
2521 if (lowerdev) {
2522 int max_mtu = lowerdev->mtu -
2523 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2524 if (new_mtu > max_mtu)
2525 return -EINVAL;
2526 }
2527
2528 dev->mtu = new_mtu;
2529 return 0;
2530 }
2531
2532 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2533 {
2534 struct vxlan_dev *vxlan = netdev_priv(dev);
2535 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2536 __be16 sport, dport;
2537
2538 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2539 vxlan->cfg.port_max, true);
2540 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2541
2542 if (ip_tunnel_info_af(info) == AF_INET) {
2543 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2544 struct rtable *rt;
2545
2546 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2547 info->key.u.ipv4.dst,
2548 &info->key.u.ipv4.src, dport, sport,
2549 &info->dst_cache, info);
2550 if (IS_ERR(rt))
2551 return PTR_ERR(rt);
2552 ip_rt_put(rt);
2553 } else {
2554 #if IS_ENABLED(CONFIG_IPV6)
2555 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2556 struct dst_entry *ndst;
2557
2558 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2559 info->key.label, &info->key.u.ipv6.dst,
2560 &info->key.u.ipv6.src, dport, sport,
2561 &info->dst_cache, info);
2562 if (IS_ERR(ndst))
2563 return PTR_ERR(ndst);
2564 dst_release(ndst);
2565 #else /* !CONFIG_IPV6 */
2566 return -EPFNOSUPPORT;
2567 #endif
2568 }
2569 info->key.tp_src = sport;
2570 info->key.tp_dst = dport;
2571 return 0;
2572 }
2573
2574 static const struct net_device_ops vxlan_netdev_ether_ops = {
2575 .ndo_init = vxlan_init,
2576 .ndo_uninit = vxlan_uninit,
2577 .ndo_open = vxlan_open,
2578 .ndo_stop = vxlan_stop,
2579 .ndo_start_xmit = vxlan_xmit,
2580 .ndo_get_stats64 = ip_tunnel_get_stats64,
2581 .ndo_set_rx_mode = vxlan_set_multicast_list,
2582 .ndo_change_mtu = vxlan_change_mtu,
2583 .ndo_validate_addr = eth_validate_addr,
2584 .ndo_set_mac_address = eth_mac_addr,
2585 .ndo_fdb_add = vxlan_fdb_add,
2586 .ndo_fdb_del = vxlan_fdb_delete,
2587 .ndo_fdb_dump = vxlan_fdb_dump,
2588 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2589 };
2590
2591 static const struct net_device_ops vxlan_netdev_raw_ops = {
2592 .ndo_init = vxlan_init,
2593 .ndo_uninit = vxlan_uninit,
2594 .ndo_open = vxlan_open,
2595 .ndo_stop = vxlan_stop,
2596 .ndo_start_xmit = vxlan_xmit,
2597 .ndo_get_stats64 = ip_tunnel_get_stats64,
2598 .ndo_change_mtu = vxlan_change_mtu,
2599 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2600 };
2601
2602 /* Info for udev, that this is a virtual tunnel endpoint */
2603 static struct device_type vxlan_type = {
2604 .name = "vxlan",
2605 };
2606
2607 /* Calls the ndo_udp_tunnel_add of the caller in order to
2608 * supply the listening VXLAN udp ports. Callers are expected
2609 * to implement the ndo_udp_tunnel_add.
2610 */
2611 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2612 {
2613 struct vxlan_sock *vs;
2614 struct net *net = dev_net(dev);
2615 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2616 unsigned int i;
2617
2618 spin_lock(&vn->sock_lock);
2619 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2620 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2621 unsigned short type;
2622
2623 if (vs->flags & VXLAN_F_GPE)
2624 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2625 else
2626 type = UDP_TUNNEL_TYPE_VXLAN;
2627
2628 if (push)
2629 udp_tunnel_push_rx_port(dev, vs->sock, type);
2630 else
2631 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2632 }
2633 }
2634 spin_unlock(&vn->sock_lock);
2635 }
2636
2637 /* Initialize the device structure. */
2638 static void vxlan_setup(struct net_device *dev)
2639 {
2640 struct vxlan_dev *vxlan = netdev_priv(dev);
2641 unsigned int h;
2642
2643 eth_hw_addr_random(dev);
2644 ether_setup(dev);
2645
2646 dev->needs_free_netdev = true;
2647 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2648
2649 dev->features |= NETIF_F_LLTX;
2650 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2651 dev->features |= NETIF_F_RXCSUM;
2652 dev->features |= NETIF_F_GSO_SOFTWARE;
2653
2654 dev->vlan_features = dev->features;
2655 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2656 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2657 netif_keep_dst(dev);
2658 dev->priv_flags |= IFF_NO_QUEUE;
2659
2660 /* MTU range: 68 - 65535 */
2661 dev->min_mtu = ETH_MIN_MTU;
2662 dev->max_mtu = ETH_MAX_MTU;
2663
2664 INIT_LIST_HEAD(&vxlan->next);
2665 spin_lock_init(&vxlan->hash_lock);
2666
2667 init_timer_deferrable(&vxlan->age_timer);
2668 vxlan->age_timer.function = vxlan_cleanup;
2669 vxlan->age_timer.data = (unsigned long) vxlan;
2670
2671 vxlan->dev = dev;
2672
2673 gro_cells_init(&vxlan->gro_cells, dev);
2674
2675 for (h = 0; h < FDB_HASH_SIZE; ++h)
2676 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2677 }
2678
2679 static void vxlan_ether_setup(struct net_device *dev)
2680 {
2681 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2682 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2683 dev->netdev_ops = &vxlan_netdev_ether_ops;
2684 }
2685
2686 static void vxlan_raw_setup(struct net_device *dev)
2687 {
2688 dev->header_ops = NULL;
2689 dev->type = ARPHRD_NONE;
2690 dev->hard_header_len = 0;
2691 dev->addr_len = 0;
2692 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2693 dev->netdev_ops = &vxlan_netdev_raw_ops;
2694 }
2695
2696 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2697 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2698 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2699 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2700 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2701 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2702 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2703 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2704 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2705 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2706 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2707 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2708 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2709 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2710 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2711 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2712 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2713 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2714 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2715 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2716 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2717 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2718 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2719 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2720 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2721 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2722 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2723 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2724 };
2725
2726 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2727 struct netlink_ext_ack *extack)
2728 {
2729 if (tb[IFLA_ADDRESS]) {
2730 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2731 pr_debug("invalid link address (not ethernet)\n");
2732 return -EINVAL;
2733 }
2734
2735 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2736 pr_debug("invalid all zero ethernet address\n");
2737 return -EADDRNOTAVAIL;
2738 }
2739 }
2740
2741 if (tb[IFLA_MTU]) {
2742 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2743
2744 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU)
2745 return -EINVAL;
2746 }
2747
2748 if (!data)
2749 return -EINVAL;
2750
2751 if (data[IFLA_VXLAN_ID]) {
2752 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2753
2754 if (id >= VXLAN_N_VID)
2755 return -ERANGE;
2756 }
2757
2758 if (data[IFLA_VXLAN_PORT_RANGE]) {
2759 const struct ifla_vxlan_port_range *p
2760 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2761
2762 if (ntohs(p->high) < ntohs(p->low)) {
2763 pr_debug("port range %u .. %u not valid\n",
2764 ntohs(p->low), ntohs(p->high));
2765 return -EINVAL;
2766 }
2767 }
2768
2769 return 0;
2770 }
2771
2772 static void vxlan_get_drvinfo(struct net_device *netdev,
2773 struct ethtool_drvinfo *drvinfo)
2774 {
2775 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2776 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2777 }
2778
2779 static const struct ethtool_ops vxlan_ethtool_ops = {
2780 .get_drvinfo = vxlan_get_drvinfo,
2781 .get_link = ethtool_op_get_link,
2782 };
2783
2784 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2785 __be16 port, u32 flags)
2786 {
2787 struct socket *sock;
2788 struct udp_port_cfg udp_conf;
2789 int err;
2790
2791 memset(&udp_conf, 0, sizeof(udp_conf));
2792
2793 if (ipv6) {
2794 udp_conf.family = AF_INET6;
2795 udp_conf.use_udp6_rx_checksums =
2796 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2797 udp_conf.ipv6_v6only = 1;
2798 } else {
2799 udp_conf.family = AF_INET;
2800 }
2801
2802 udp_conf.local_udp_port = port;
2803
2804 /* Open UDP socket */
2805 err = udp_sock_create(net, &udp_conf, &sock);
2806 if (err < 0)
2807 return ERR_PTR(err);
2808
2809 return sock;
2810 }
2811
2812 /* Create new listen socket if needed */
2813 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2814 __be16 port, u32 flags)
2815 {
2816 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2817 struct vxlan_sock *vs;
2818 struct socket *sock;
2819 unsigned int h;
2820 struct udp_tunnel_sock_cfg tunnel_cfg;
2821
2822 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2823 if (!vs)
2824 return ERR_PTR(-ENOMEM);
2825
2826 for (h = 0; h < VNI_HASH_SIZE; ++h)
2827 INIT_HLIST_HEAD(&vs->vni_list[h]);
2828
2829 sock = vxlan_create_sock(net, ipv6, port, flags);
2830 if (IS_ERR(sock)) {
2831 kfree(vs);
2832 return ERR_CAST(sock);
2833 }
2834
2835 vs->sock = sock;
2836 refcount_set(&vs->refcnt, 1);
2837 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2838
2839 spin_lock(&vn->sock_lock);
2840 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2841 udp_tunnel_notify_add_rx_port(sock,
2842 (vs->flags & VXLAN_F_GPE) ?
2843 UDP_TUNNEL_TYPE_VXLAN_GPE :
2844 UDP_TUNNEL_TYPE_VXLAN);
2845 spin_unlock(&vn->sock_lock);
2846
2847 /* Mark socket as an encapsulation socket. */
2848 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2849 tunnel_cfg.sk_user_data = vs;
2850 tunnel_cfg.encap_type = 1;
2851 tunnel_cfg.encap_rcv = vxlan_rcv;
2852 tunnel_cfg.encap_destroy = NULL;
2853 tunnel_cfg.gro_receive = vxlan_gro_receive;
2854 tunnel_cfg.gro_complete = vxlan_gro_complete;
2855
2856 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2857
2858 return vs;
2859 }
2860
2861 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2862 {
2863 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2864 struct vxlan_sock *vs = NULL;
2865 struct vxlan_dev_node *node;
2866
2867 if (!vxlan->cfg.no_share) {
2868 spin_lock(&vn->sock_lock);
2869 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2870 vxlan->cfg.dst_port, vxlan->cfg.flags);
2871 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2872 spin_unlock(&vn->sock_lock);
2873 return -EBUSY;
2874 }
2875 spin_unlock(&vn->sock_lock);
2876 }
2877 if (!vs)
2878 vs = vxlan_socket_create(vxlan->net, ipv6,
2879 vxlan->cfg.dst_port, vxlan->cfg.flags);
2880 if (IS_ERR(vs))
2881 return PTR_ERR(vs);
2882 #if IS_ENABLED(CONFIG_IPV6)
2883 if (ipv6) {
2884 rcu_assign_pointer(vxlan->vn6_sock, vs);
2885 node = &vxlan->hlist6;
2886 } else
2887 #endif
2888 {
2889 rcu_assign_pointer(vxlan->vn4_sock, vs);
2890 node = &vxlan->hlist4;
2891 }
2892 vxlan_vs_add_dev(vs, vxlan, node);
2893 return 0;
2894 }
2895
2896 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2897 {
2898 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2899 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2900 bool ipv4 = !ipv6 || metadata;
2901 int ret = 0;
2902
2903 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2904 #if IS_ENABLED(CONFIG_IPV6)
2905 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2906 if (ipv6) {
2907 ret = __vxlan_sock_add(vxlan, true);
2908 if (ret < 0 && ret != -EAFNOSUPPORT)
2909 ipv4 = false;
2910 }
2911 #endif
2912 if (ipv4)
2913 ret = __vxlan_sock_add(vxlan, false);
2914 if (ret < 0)
2915 vxlan_sock_release(vxlan);
2916 return ret;
2917 }
2918
2919 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2920 struct net_device **lower,
2921 struct vxlan_dev *old)
2922 {
2923 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2924 struct vxlan_dev *tmp;
2925 bool use_ipv6 = false;
2926
2927 if (conf->flags & VXLAN_F_GPE) {
2928 /* For now, allow GPE only together with
2929 * COLLECT_METADATA. This can be relaxed later; in such
2930 * case, the other side of the PtP link will have to be
2931 * provided.
2932 */
2933 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2934 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2935 return -EINVAL;
2936 }
2937 }
2938
2939 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
2940 /* Unless IPv6 is explicitly requested, assume IPv4 */
2941 conf->remote_ip.sa.sa_family = AF_INET;
2942 conf->saddr.sa.sa_family = AF_INET;
2943 } else if (!conf->remote_ip.sa.sa_family) {
2944 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
2945 } else if (!conf->saddr.sa.sa_family) {
2946 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
2947 }
2948
2949 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family)
2950 return -EINVAL;
2951
2952 if (vxlan_addr_multicast(&conf->saddr))
2953 return -EINVAL;
2954
2955 if (conf->saddr.sa.sa_family == AF_INET6) {
2956 if (!IS_ENABLED(CONFIG_IPV6))
2957 return -EPFNOSUPPORT;
2958 use_ipv6 = true;
2959 conf->flags |= VXLAN_F_IPV6;
2960
2961 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2962 int local_type =
2963 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
2964 int remote_type =
2965 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
2966
2967 if (local_type & IPV6_ADDR_LINKLOCAL) {
2968 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
2969 (remote_type != IPV6_ADDR_ANY))
2970 return -EINVAL;
2971
2972 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
2973 } else {
2974 if (remote_type ==
2975 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL))
2976 return -EINVAL;
2977
2978 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
2979 }
2980 }
2981 }
2982
2983 if (conf->label && !use_ipv6)
2984 return -EINVAL;
2985
2986 if (conf->remote_ifindex) {
2987 struct net_device *lowerdev;
2988
2989 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2990 if (!lowerdev)
2991 return -ENODEV;
2992
2993 #if IS_ENABLED(CONFIG_IPV6)
2994 if (use_ipv6) {
2995 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2996 if (idev && idev->cnf.disable_ipv6)
2997 return -EPERM;
2998 }
2999 #endif
3000
3001 *lower = lowerdev;
3002 } else {
3003 if (vxlan_addr_multicast(&conf->remote_ip))
3004 return -EINVAL;
3005
3006 #if IS_ENABLED(CONFIG_IPV6)
3007 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL)
3008 return -EINVAL;
3009 #endif
3010
3011 *lower = NULL;
3012 }
3013
3014 if (!conf->dst_port) {
3015 if (conf->flags & VXLAN_F_GPE)
3016 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3017 else
3018 conf->dst_port = htons(vxlan_port);
3019 }
3020
3021 if (!conf->age_interval)
3022 conf->age_interval = FDB_AGE_DEFAULT;
3023
3024 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3025 if (tmp == old)
3026 continue;
3027
3028 if (tmp->cfg.vni != conf->vni)
3029 continue;
3030 if (tmp->cfg.dst_port != conf->dst_port)
3031 continue;
3032 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3033 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3034 continue;
3035
3036 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3037 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3038 continue;
3039
3040 return -EEXIST;
3041 }
3042
3043 return 0;
3044 }
3045
3046 static void vxlan_config_apply(struct net_device *dev,
3047 struct vxlan_config *conf,
3048 struct net_device *lowerdev,
3049 struct net *src_net,
3050 bool changelink)
3051 {
3052 struct vxlan_dev *vxlan = netdev_priv(dev);
3053 struct vxlan_rdst *dst = &vxlan->default_dst;
3054 unsigned short needed_headroom = ETH_HLEN;
3055 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3056 int max_mtu = ETH_MAX_MTU;
3057
3058 if (!changelink) {
3059 if (conf->flags & VXLAN_F_GPE)
3060 vxlan_raw_setup(dev);
3061 else
3062 vxlan_ether_setup(dev);
3063
3064 if (conf->mtu)
3065 dev->mtu = conf->mtu;
3066
3067 vxlan->net = src_net;
3068 }
3069
3070 dst->remote_vni = conf->vni;
3071
3072 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3073
3074 if (lowerdev) {
3075 dst->remote_ifindex = conf->remote_ifindex;
3076
3077 dev->gso_max_size = lowerdev->gso_max_size;
3078 dev->gso_max_segs = lowerdev->gso_max_segs;
3079
3080 needed_headroom = lowerdev->hard_header_len;
3081
3082 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3083 VXLAN_HEADROOM);
3084 }
3085
3086 if (dev->mtu > max_mtu)
3087 dev->mtu = max_mtu;
3088
3089 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3090 needed_headroom += VXLAN6_HEADROOM;
3091 else
3092 needed_headroom += VXLAN_HEADROOM;
3093 dev->needed_headroom = needed_headroom;
3094
3095 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3096 }
3097
3098 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3099 struct vxlan_config *conf,
3100 bool changelink)
3101 {
3102 struct vxlan_dev *vxlan = netdev_priv(dev);
3103 struct net_device *lowerdev;
3104 int ret;
3105
3106 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan);
3107 if (ret)
3108 return ret;
3109
3110 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3111
3112 return 0;
3113 }
3114
3115 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3116 struct vxlan_config *conf)
3117 {
3118 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3119 struct vxlan_dev *vxlan = netdev_priv(dev);
3120 int err;
3121
3122 err = vxlan_dev_configure(net, dev, conf, false);
3123 if (err)
3124 return err;
3125
3126 dev->ethtool_ops = &vxlan_ethtool_ops;
3127
3128 /* create an fdb entry for a valid default destination */
3129 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3130 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3131 &vxlan->default_dst.remote_ip,
3132 NUD_REACHABLE | NUD_PERMANENT,
3133 NLM_F_EXCL | NLM_F_CREATE,
3134 vxlan->cfg.dst_port,
3135 vxlan->default_dst.remote_vni,
3136 vxlan->default_dst.remote_vni,
3137 vxlan->default_dst.remote_ifindex,
3138 NTF_SELF);
3139 if (err)
3140 return err;
3141 }
3142
3143 err = register_netdevice(dev);
3144 if (err) {
3145 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3146 return err;
3147 }
3148
3149 list_add(&vxlan->next, &vn->vxlan_list);
3150 return 0;
3151 }
3152
3153 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3154 struct net_device *dev, struct vxlan_config *conf,
3155 bool changelink)
3156 {
3157 struct vxlan_dev *vxlan = netdev_priv(dev);
3158
3159 memset(conf, 0, sizeof(*conf));
3160
3161 /* if changelink operation, start with old existing cfg */
3162 if (changelink)
3163 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3164
3165 if (data[IFLA_VXLAN_ID]) {
3166 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3167
3168 if (changelink && (vni != conf->vni))
3169 return -EOPNOTSUPP;
3170 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3171 }
3172
3173 if (data[IFLA_VXLAN_GROUP]) {
3174 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3175 return -EOPNOTSUPP;
3176
3177 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3178 conf->remote_ip.sa.sa_family = AF_INET;
3179 } else if (data[IFLA_VXLAN_GROUP6]) {
3180 if (!IS_ENABLED(CONFIG_IPV6))
3181 return -EPFNOSUPPORT;
3182
3183 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3184 return -EOPNOTSUPP;
3185
3186 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3187 conf->remote_ip.sa.sa_family = AF_INET6;
3188 }
3189
3190 if (data[IFLA_VXLAN_LOCAL]) {
3191 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3192 return -EOPNOTSUPP;
3193
3194 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3195 conf->saddr.sa.sa_family = AF_INET;
3196 } else if (data[IFLA_VXLAN_LOCAL6]) {
3197 if (!IS_ENABLED(CONFIG_IPV6))
3198 return -EPFNOSUPPORT;
3199
3200 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3201 return -EOPNOTSUPP;
3202
3203 /* TODO: respect scope id */
3204 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3205 conf->saddr.sa.sa_family = AF_INET6;
3206 }
3207
3208 if (data[IFLA_VXLAN_LINK])
3209 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3210
3211 if (data[IFLA_VXLAN_TOS])
3212 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3213
3214 if (data[IFLA_VXLAN_TTL])
3215 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3216
3217 if (data[IFLA_VXLAN_LABEL])
3218 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3219 IPV6_FLOWLABEL_MASK;
3220
3221 if (data[IFLA_VXLAN_LEARNING]) {
3222 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3223 conf->flags |= VXLAN_F_LEARN;
3224 else
3225 conf->flags &= ~VXLAN_F_LEARN;
3226 } else if (!changelink) {
3227 /* default to learn on a new device */
3228 conf->flags |= VXLAN_F_LEARN;
3229 }
3230
3231 if (data[IFLA_VXLAN_AGEING]) {
3232 if (changelink)
3233 return -EOPNOTSUPP;
3234 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3235 }
3236
3237 if (data[IFLA_VXLAN_PROXY]) {
3238 if (changelink)
3239 return -EOPNOTSUPP;
3240 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3241 conf->flags |= VXLAN_F_PROXY;
3242 }
3243
3244 if (data[IFLA_VXLAN_RSC]) {
3245 if (changelink)
3246 return -EOPNOTSUPP;
3247 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3248 conf->flags |= VXLAN_F_RSC;
3249 }
3250
3251 if (data[IFLA_VXLAN_L2MISS]) {
3252 if (changelink)
3253 return -EOPNOTSUPP;
3254 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3255 conf->flags |= VXLAN_F_L2MISS;
3256 }
3257
3258 if (data[IFLA_VXLAN_L3MISS]) {
3259 if (changelink)
3260 return -EOPNOTSUPP;
3261 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3262 conf->flags |= VXLAN_F_L3MISS;
3263 }
3264
3265 if (data[IFLA_VXLAN_LIMIT]) {
3266 if (changelink)
3267 return -EOPNOTSUPP;
3268 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3269 }
3270
3271 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3272 if (changelink)
3273 return -EOPNOTSUPP;
3274 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3275 conf->flags |= VXLAN_F_COLLECT_METADATA;
3276 }
3277
3278 if (data[IFLA_VXLAN_PORT_RANGE]) {
3279 if (!changelink) {
3280 const struct ifla_vxlan_port_range *p
3281 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3282 conf->port_min = ntohs(p->low);
3283 conf->port_max = ntohs(p->high);
3284 } else {
3285 return -EOPNOTSUPP;
3286 }
3287 }
3288
3289 if (data[IFLA_VXLAN_PORT]) {
3290 if (changelink)
3291 return -EOPNOTSUPP;
3292 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3293 }
3294
3295 if (data[IFLA_VXLAN_UDP_CSUM]) {
3296 if (changelink)
3297 return -EOPNOTSUPP;
3298 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3299 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3300 }
3301
3302 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3303 if (changelink)
3304 return -EOPNOTSUPP;
3305 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3306 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3307 }
3308
3309 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3310 if (changelink)
3311 return -EOPNOTSUPP;
3312 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3313 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3314 }
3315
3316 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3317 if (changelink)
3318 return -EOPNOTSUPP;
3319 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3320 conf->flags |= VXLAN_F_REMCSUM_TX;
3321 }
3322
3323 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3324 if (changelink)
3325 return -EOPNOTSUPP;
3326 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3327 conf->flags |= VXLAN_F_REMCSUM_RX;
3328 }
3329
3330 if (data[IFLA_VXLAN_GBP]) {
3331 if (changelink)
3332 return -EOPNOTSUPP;
3333 conf->flags |= VXLAN_F_GBP;
3334 }
3335
3336 if (data[IFLA_VXLAN_GPE]) {
3337 if (changelink)
3338 return -EOPNOTSUPP;
3339 conf->flags |= VXLAN_F_GPE;
3340 }
3341
3342 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3343 if (changelink)
3344 return -EOPNOTSUPP;
3345 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3346 }
3347
3348 if (tb[IFLA_MTU]) {
3349 if (changelink)
3350 return -EOPNOTSUPP;
3351 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3352 }
3353
3354 return 0;
3355 }
3356
3357 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3358 struct nlattr *tb[], struct nlattr *data[],
3359 struct netlink_ext_ack *extack)
3360 {
3361 struct vxlan_config conf;
3362 int err;
3363
3364 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3365 if (err)
3366 return err;
3367
3368 return __vxlan_dev_create(src_net, dev, &conf);
3369 }
3370
3371 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3372 struct nlattr *data[],
3373 struct netlink_ext_ack *extack)
3374 {
3375 struct vxlan_dev *vxlan = netdev_priv(dev);
3376 struct vxlan_rdst *dst = &vxlan->default_dst;
3377 struct vxlan_rdst old_dst;
3378 struct vxlan_config conf;
3379 int err;
3380
3381 err = vxlan_nl2conf(tb, data,
3382 dev, &conf, true);
3383 if (err)
3384 return err;
3385
3386 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3387
3388 err = vxlan_dev_configure(vxlan->net, dev, &conf, true);
3389 if (err)
3390 return err;
3391
3392 /* handle default dst entry */
3393 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3394 spin_lock_bh(&vxlan->hash_lock);
3395 if (!vxlan_addr_any(&old_dst.remote_ip))
3396 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3397 old_dst.remote_ip,
3398 vxlan->cfg.dst_port,
3399 old_dst.remote_vni,
3400 old_dst.remote_vni,
3401 old_dst.remote_ifindex, 0);
3402
3403 if (!vxlan_addr_any(&dst->remote_ip)) {
3404 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3405 &dst->remote_ip,
3406 NUD_REACHABLE | NUD_PERMANENT,
3407 NLM_F_CREATE | NLM_F_APPEND,
3408 vxlan->cfg.dst_port,
3409 dst->remote_vni,
3410 dst->remote_vni,
3411 dst->remote_ifindex,
3412 NTF_SELF);
3413 if (err) {
3414 spin_unlock_bh(&vxlan->hash_lock);
3415 return err;
3416 }
3417 }
3418 spin_unlock_bh(&vxlan->hash_lock);
3419 }
3420
3421 return 0;
3422 }
3423
3424 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3425 {
3426 struct vxlan_dev *vxlan = netdev_priv(dev);
3427
3428 vxlan_flush(vxlan, true);
3429
3430 gro_cells_destroy(&vxlan->gro_cells);
3431 list_del(&vxlan->next);
3432 unregister_netdevice_queue(dev, head);
3433 }
3434
3435 static size_t vxlan_get_size(const struct net_device *dev)
3436 {
3437
3438 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3439 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3440 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3441 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3442 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3443 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3444 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3445 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3446 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3447 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3448 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3449 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3450 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3451 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3452 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3453 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3454 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3455 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3456 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3457 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3458 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3459 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3460 0;
3461 }
3462
3463 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3464 {
3465 const struct vxlan_dev *vxlan = netdev_priv(dev);
3466 const struct vxlan_rdst *dst = &vxlan->default_dst;
3467 struct ifla_vxlan_port_range ports = {
3468 .low = htons(vxlan->cfg.port_min),
3469 .high = htons(vxlan->cfg.port_max),
3470 };
3471
3472 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3473 goto nla_put_failure;
3474
3475 if (!vxlan_addr_any(&dst->remote_ip)) {
3476 if (dst->remote_ip.sa.sa_family == AF_INET) {
3477 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3478 dst->remote_ip.sin.sin_addr.s_addr))
3479 goto nla_put_failure;
3480 #if IS_ENABLED(CONFIG_IPV6)
3481 } else {
3482 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3483 &dst->remote_ip.sin6.sin6_addr))
3484 goto nla_put_failure;
3485 #endif
3486 }
3487 }
3488
3489 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3490 goto nla_put_failure;
3491
3492 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3493 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3494 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3495 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3496 goto nla_put_failure;
3497 #if IS_ENABLED(CONFIG_IPV6)
3498 } else {
3499 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3500 &vxlan->cfg.saddr.sin6.sin6_addr))
3501 goto nla_put_failure;
3502 #endif
3503 }
3504 }
3505
3506 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3507 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3508 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3509 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3510 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3511 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3512 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3513 nla_put_u8(skb, IFLA_VXLAN_RSC,
3514 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3515 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3516 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3517 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3518 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3519 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3520 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3521 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3522 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3523 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3524 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3525 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3526 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3527 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3528 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3529 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3530 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3531 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3532 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3533 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3534 goto nla_put_failure;
3535
3536 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3537 goto nla_put_failure;
3538
3539 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3540 nla_put_flag(skb, IFLA_VXLAN_GBP))
3541 goto nla_put_failure;
3542
3543 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3544 nla_put_flag(skb, IFLA_VXLAN_GPE))
3545 goto nla_put_failure;
3546
3547 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3548 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3549 goto nla_put_failure;
3550
3551 return 0;
3552
3553 nla_put_failure:
3554 return -EMSGSIZE;
3555 }
3556
3557 static struct net *vxlan_get_link_net(const struct net_device *dev)
3558 {
3559 struct vxlan_dev *vxlan = netdev_priv(dev);
3560
3561 return vxlan->net;
3562 }
3563
3564 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3565 .kind = "vxlan",
3566 .maxtype = IFLA_VXLAN_MAX,
3567 .policy = vxlan_policy,
3568 .priv_size = sizeof(struct vxlan_dev),
3569 .setup = vxlan_setup,
3570 .validate = vxlan_validate,
3571 .newlink = vxlan_newlink,
3572 .changelink = vxlan_changelink,
3573 .dellink = vxlan_dellink,
3574 .get_size = vxlan_get_size,
3575 .fill_info = vxlan_fill_info,
3576 .get_link_net = vxlan_get_link_net,
3577 };
3578
3579 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3580 u8 name_assign_type,
3581 struct vxlan_config *conf)
3582 {
3583 struct nlattr *tb[IFLA_MAX + 1];
3584 struct net_device *dev;
3585 int err;
3586
3587 memset(&tb, 0, sizeof(tb));
3588
3589 dev = rtnl_create_link(net, name, name_assign_type,
3590 &vxlan_link_ops, tb);
3591 if (IS_ERR(dev))
3592 return dev;
3593
3594 err = __vxlan_dev_create(net, dev, conf);
3595 if (err < 0) {
3596 free_netdev(dev);
3597 return ERR_PTR(err);
3598 }
3599
3600 err = rtnl_configure_link(dev, NULL);
3601 if (err < 0) {
3602 LIST_HEAD(list_kill);
3603
3604 vxlan_dellink(dev, &list_kill);
3605 unregister_netdevice_many(&list_kill);
3606 return ERR_PTR(err);
3607 }
3608
3609 return dev;
3610 }
3611 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3612
3613 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3614 struct net_device *dev)
3615 {
3616 struct vxlan_dev *vxlan, *next;
3617 LIST_HEAD(list_kill);
3618
3619 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3620 struct vxlan_rdst *dst = &vxlan->default_dst;
3621
3622 /* In case we created vxlan device with carrier
3623 * and we loose the carrier due to module unload
3624 * we also need to remove vxlan device. In other
3625 * cases, it's not necessary and remote_ifindex
3626 * is 0 here, so no matches.
3627 */
3628 if (dst->remote_ifindex == dev->ifindex)
3629 vxlan_dellink(vxlan->dev, &list_kill);
3630 }
3631
3632 unregister_netdevice_many(&list_kill);
3633 }
3634
3635 static int vxlan_netdevice_event(struct notifier_block *unused,
3636 unsigned long event, void *ptr)
3637 {
3638 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3639 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3640
3641 if (event == NETDEV_UNREGISTER) {
3642 vxlan_offload_rx_ports(dev, false);
3643 vxlan_handle_lowerdev_unregister(vn, dev);
3644 } else if (event == NETDEV_REGISTER) {
3645 vxlan_offload_rx_ports(dev, true);
3646 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3647 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3648 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3649 }
3650
3651 return NOTIFY_DONE;
3652 }
3653
3654 static struct notifier_block vxlan_notifier_block __read_mostly = {
3655 .notifier_call = vxlan_netdevice_event,
3656 };
3657
3658 static __net_init int vxlan_init_net(struct net *net)
3659 {
3660 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3661 unsigned int h;
3662
3663 INIT_LIST_HEAD(&vn->vxlan_list);
3664 spin_lock_init(&vn->sock_lock);
3665
3666 for (h = 0; h < PORT_HASH_SIZE; ++h)
3667 INIT_HLIST_HEAD(&vn->sock_list[h]);
3668
3669 return 0;
3670 }
3671
3672 static void __net_exit vxlan_exit_net(struct net *net)
3673 {
3674 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3675 struct vxlan_dev *vxlan, *next;
3676 struct net_device *dev, *aux;
3677 LIST_HEAD(list);
3678
3679 rtnl_lock();
3680 for_each_netdev_safe(net, dev, aux)
3681 if (dev->rtnl_link_ops == &vxlan_link_ops)
3682 unregister_netdevice_queue(dev, &list);
3683
3684 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3685 /* If vxlan->dev is in the same netns, it has already been added
3686 * to the list by the previous loop.
3687 */
3688 if (!net_eq(dev_net(vxlan->dev), net)) {
3689 gro_cells_destroy(&vxlan->gro_cells);
3690 unregister_netdevice_queue(vxlan->dev, &list);
3691 }
3692 }
3693
3694 unregister_netdevice_many(&list);
3695 rtnl_unlock();
3696 }
3697
3698 static struct pernet_operations vxlan_net_ops = {
3699 .init = vxlan_init_net,
3700 .exit = vxlan_exit_net,
3701 .id = &vxlan_net_id,
3702 .size = sizeof(struct vxlan_net),
3703 };
3704
3705 static int __init vxlan_init_module(void)
3706 {
3707 int rc;
3708
3709 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3710
3711 rc = register_pernet_subsys(&vxlan_net_ops);
3712 if (rc)
3713 goto out1;
3714
3715 rc = register_netdevice_notifier(&vxlan_notifier_block);
3716 if (rc)
3717 goto out2;
3718
3719 rc = rtnl_link_register(&vxlan_link_ops);
3720 if (rc)
3721 goto out3;
3722
3723 return 0;
3724 out3:
3725 unregister_netdevice_notifier(&vxlan_notifier_block);
3726 out2:
3727 unregister_pernet_subsys(&vxlan_net_ops);
3728 out1:
3729 return rc;
3730 }
3731 late_initcall(vxlan_init_module);
3732
3733 static void __exit vxlan_cleanup_module(void)
3734 {
3735 rtnl_link_unregister(&vxlan_link_ops);
3736 unregister_netdevice_notifier(&vxlan_notifier_block);
3737 unregister_pernet_subsys(&vxlan_net_ops);
3738 /* rcu_barrier() is called by netns */
3739 }
3740 module_exit(vxlan_cleanup_module);
3741
3742 MODULE_LICENSE("GPL");
3743 MODULE_VERSION(VXLAN_VERSION);
3744 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3745 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3746 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support