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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / net / vxlan.c
blob297cdeaef4796501279f826154191eb6e0e0d298
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/tun_proto.h>
30 #include <net/vxlan.h>
31
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <net/ip6_tunnel.h>
34 #include <net/ip6_checksum.h>
35 #endif
36
37 #define VXLAN_VERSION "0.1"
38
39 #define PORT_HASH_BITS 8
40 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41 #define FDB_AGE_DEFAULT 300 /* 5 min */
42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44 /* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48 static unsigned short vxlan_port __read_mostly = 8472;
49 module_param_named(udp_port, vxlan_port, ushort, 0444);
50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52 static bool log_ecn_error = true;
53 module_param(log_ecn_error, bool, 0644);
54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56 static unsigned int vxlan_net_id;
57 static struct rtnl_link_ops vxlan_link_ops;
58
59 static const u8 all_zeros_mac[ETH_ALEN + 2];
60
61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64
65 /* per-network namespace private data for this module */
66 struct vxlan_net {
67 struct list_head vxlan_list;
68 struct hlist_head sock_list[PORT_HASH_SIZE];
69 spinlock_t sock_lock;
70 };
71
72 /* Forwarding table entry */
73 struct vxlan_fdb {
74 struct hlist_node hlist; /* linked list of entries */
75 struct rcu_head rcu;
76 unsigned long updated; /* jiffies */
77 unsigned long used;
78 struct list_head remotes;
79 u8 eth_addr[ETH_ALEN];
80 u16 state; /* see ndm_state */
81 __be32 vni;
82 u8 flags; /* see ndm_flags */
83 };
84
85 /* salt for hash table */
86 static u32 vxlan_salt __read_mostly;
87
88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
89 {
90 return vs->flags & VXLAN_F_COLLECT_METADATA ||
91 ip_tunnel_collect_metadata();
92 }
93
94 #if IS_ENABLED(CONFIG_IPV6)
95 static inline
96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
97 {
98 if (a->sa.sa_family != b->sa.sa_family)
99 return false;
100 if (a->sa.sa_family == AF_INET6)
101 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
102 else
103 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
104 }
105
106 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
107 {
108 if (nla_len(nla) >= sizeof(struct in6_addr)) {
109 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
110 ip->sa.sa_family = AF_INET6;
111 return 0;
112 } else if (nla_len(nla) >= sizeof(__be32)) {
113 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
114 ip->sa.sa_family = AF_INET;
115 return 0;
116 } else {
117 return -EAFNOSUPPORT;
118 }
119 }
120
121 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
122 const union vxlan_addr *ip)
123 {
124 if (ip->sa.sa_family == AF_INET6)
125 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
126 else
127 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
128 }
129
130 #else /* !CONFIG_IPV6 */
131
132 static inline
133 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
134 {
135 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
136 }
137
138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
139 {
140 if (nla_len(nla) >= sizeof(struct in6_addr)) {
141 return -EAFNOSUPPORT;
142 } else if (nla_len(nla) >= sizeof(__be32)) {
143 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
144 ip->sa.sa_family = AF_INET;
145 return 0;
146 } else {
147 return -EAFNOSUPPORT;
148 }
149 }
150
151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
152 const union vxlan_addr *ip)
153 {
154 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
155 }
156 #endif
157
158 /* Virtual Network hash table head */
159 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
160 {
161 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
162 }
163
164 /* Socket hash table head */
165 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
166 {
167 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
168
169 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
170 }
171
172 /* First remote destination for a forwarding entry.
173 * Guaranteed to be non-NULL because remotes are never deleted.
174 */
175 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
176 {
177 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
178 }
179
180 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
181 {
182 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
183 }
184
185 /* Find VXLAN socket based on network namespace, address family and UDP port
186 * and enabled unshareable flags.
187 */
188 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
189 __be16 port, u32 flags)
190 {
191 struct vxlan_sock *vs;
192
193 flags &= VXLAN_F_RCV_FLAGS;
194
195 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
196 if (inet_sk(vs->sock->sk)->inet_sport == port &&
197 vxlan_get_sk_family(vs) == family &&
198 vs->flags == flags)
199 return vs;
200 }
201 return NULL;
202 }
203
204 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
205 __be32 vni)
206 {
207 struct vxlan_dev_node *node;
208
209 /* For flow based devices, map all packets to VNI 0 */
210 if (vs->flags & VXLAN_F_COLLECT_METADATA)
211 vni = 0;
212
213 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
214 if (node->vxlan->default_dst.remote_vni != vni)
215 continue;
216
217 if (IS_ENABLED(CONFIG_IPV6)) {
218 const struct vxlan_config *cfg = &node->vxlan->cfg;
219
220 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
221 cfg->remote_ifindex != ifindex)
222 continue;
223 }
224
225 return node->vxlan;
226 }
227
228 return NULL;
229 }
230
231 /* Look up VNI in a per net namespace table */
232 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
233 __be32 vni, sa_family_t family,
234 __be16 port, u32 flags)
235 {
236 struct vxlan_sock *vs;
237
238 vs = vxlan_find_sock(net, family, port, flags);
239 if (!vs)
240 return NULL;
241
242 return vxlan_vs_find_vni(vs, ifindex, vni);
243 }
244
245 /* Fill in neighbour message in skbuff. */
246 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
247 const struct vxlan_fdb *fdb,
248 u32 portid, u32 seq, int type, unsigned int flags,
249 const struct vxlan_rdst *rdst)
250 {
251 unsigned long now = jiffies;
252 struct nda_cacheinfo ci;
253 struct nlmsghdr *nlh;
254 struct ndmsg *ndm;
255 bool send_ip, send_eth;
256
257 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
258 if (nlh == NULL)
259 return -EMSGSIZE;
260
261 ndm = nlmsg_data(nlh);
262 memset(ndm, 0, sizeof(*ndm));
263
264 send_eth = send_ip = true;
265
266 if (type == RTM_GETNEIGH) {
267 send_ip = !vxlan_addr_any(&rdst->remote_ip);
268 send_eth = !is_zero_ether_addr(fdb->eth_addr);
269 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
270 } else
271 ndm->ndm_family = AF_BRIDGE;
272 ndm->ndm_state = fdb->state;
273 ndm->ndm_ifindex = vxlan->dev->ifindex;
274 ndm->ndm_flags = fdb->flags;
275 if (rdst->offloaded)
276 ndm->ndm_flags |= NTF_OFFLOADED;
277 ndm->ndm_type = RTN_UNICAST;
278
279 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
280 nla_put_s32(skb, NDA_LINK_NETNSID,
281 peernet2id(dev_net(vxlan->dev), vxlan->net)))
282 goto nla_put_failure;
283
284 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
285 goto nla_put_failure;
286
287 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
288 goto nla_put_failure;
289
290 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
291 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
292 goto nla_put_failure;
293 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
294 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
295 goto nla_put_failure;
296 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
297 nla_put_u32(skb, NDA_SRC_VNI,
298 be32_to_cpu(fdb->vni)))
299 goto nla_put_failure;
300 if (rdst->remote_ifindex &&
301 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
302 goto nla_put_failure;
303
304 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
305 ci.ndm_confirmed = 0;
306 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
307 ci.ndm_refcnt = 0;
308
309 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
310 goto nla_put_failure;
311
312 nlmsg_end(skb, nlh);
313 return 0;
314
315 nla_put_failure:
316 nlmsg_cancel(skb, nlh);
317 return -EMSGSIZE;
318 }
319
320 static inline size_t vxlan_nlmsg_size(void)
321 {
322 return NLMSG_ALIGN(sizeof(struct ndmsg))
323 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
324 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
325 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
326 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
327 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
328 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
329 + nla_total_size(sizeof(struct nda_cacheinfo));
330 }
331
332 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
333 struct vxlan_rdst *rd, int type)
334 {
335 struct net *net = dev_net(vxlan->dev);
336 struct sk_buff *skb;
337 int err = -ENOBUFS;
338
339 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
340 if (skb == NULL)
341 goto errout;
342
343 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
344 if (err < 0) {
345 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
346 WARN_ON(err == -EMSGSIZE);
347 kfree_skb(skb);
348 goto errout;
349 }
350
351 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
352 return;
353 errout:
354 if (err < 0)
355 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
356 }
357
358 static void vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
359 struct vxlan_fdb *fdb,
360 struct vxlan_rdst *rd,
361 bool adding)
362 {
363 struct switchdev_notifier_vxlan_fdb_info info;
364 enum switchdev_notifier_type notifier_type;
365
366 if (WARN_ON(!rd))
367 return;
368
369 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
370 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
371
372 info = (struct switchdev_notifier_vxlan_fdb_info){
373 .remote_ip = rd->remote_ip,
374 .remote_port = rd->remote_port,
375 .remote_vni = rd->remote_vni,
376 .remote_ifindex = rd->remote_ifindex,
377 .vni = fdb->vni,
378 .offloaded = rd->offloaded,
379 };
380 memcpy(info.eth_addr, fdb->eth_addr, ETH_ALEN);
381
382 call_switchdev_notifiers(notifier_type, vxlan->dev,
383 &info.info);
384 }
385
386 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
387 struct vxlan_rdst *rd, int type)
388 {
389 switch (type) {
390 case RTM_NEWNEIGH:
391 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, true);
392 break;
393 case RTM_DELNEIGH:
394 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, false);
395 break;
396 }
397
398 __vxlan_fdb_notify(vxlan, fdb, rd, type);
399 }
400
401 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
402 {
403 struct vxlan_dev *vxlan = netdev_priv(dev);
404 struct vxlan_fdb f = {
405 .state = NUD_STALE,
406 };
407 struct vxlan_rdst remote = {
408 .remote_ip = *ipa, /* goes to NDA_DST */
409 .remote_vni = cpu_to_be32(VXLAN_N_VID),
410 };
411
412 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
413 }
414
415 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
416 {
417 struct vxlan_fdb f = {
418 .state = NUD_STALE,
419 };
420 struct vxlan_rdst remote = { };
421
422 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
423
424 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
425 }
426
427 /* Hash Ethernet address */
428 static u32 eth_hash(const unsigned char *addr)
429 {
430 u64 value = get_unaligned((u64 *)addr);
431
432 /* only want 6 bytes */
433 #ifdef __BIG_ENDIAN
434 value >>= 16;
435 #else
436 value <<= 16;
437 #endif
438 return hash_64(value, FDB_HASH_BITS);
439 }
440
441 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
442 {
443 /* use 1 byte of OUI and 3 bytes of NIC */
444 u32 key = get_unaligned((u32 *)(addr + 2));
445
446 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
447 }
448
449 /* Hash chain to use given mac address */
450 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
451 const u8 *mac, __be32 vni)
452 {
453 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
454 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
455 else
456 return &vxlan->fdb_head[eth_hash(mac)];
457 }
458
459 /* Look up Ethernet address in forwarding table */
460 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
461 const u8 *mac, __be32 vni)
462 {
463 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
464 struct vxlan_fdb *f;
465
466 hlist_for_each_entry_rcu(f, head, hlist) {
467 if (ether_addr_equal(mac, f->eth_addr)) {
468 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
469 if (vni == f->vni)
470 return f;
471 } else {
472 return f;
473 }
474 }
475 }
476
477 return NULL;
478 }
479
480 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
481 const u8 *mac, __be32 vni)
482 {
483 struct vxlan_fdb *f;
484
485 f = __vxlan_find_mac(vxlan, mac, vni);
486 if (f && f->used != jiffies)
487 f->used = jiffies;
488
489 return f;
490 }
491
492 /* caller should hold vxlan->hash_lock */
493 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
494 union vxlan_addr *ip, __be16 port,
495 __be32 vni, __u32 ifindex)
496 {
497 struct vxlan_rdst *rd;
498
499 list_for_each_entry(rd, &f->remotes, list) {
500 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
501 rd->remote_port == port &&
502 rd->remote_vni == vni &&
503 rd->remote_ifindex == ifindex)
504 return rd;
505 }
506
507 return NULL;
508 }
509
510 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
511 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
512 {
513 struct vxlan_dev *vxlan = netdev_priv(dev);
514 u8 eth_addr[ETH_ALEN + 2] = { 0 };
515 struct vxlan_rdst *rdst;
516 struct vxlan_fdb *f;
517 int rc = 0;
518
519 if (is_multicast_ether_addr(mac) ||
520 is_zero_ether_addr(mac))
521 return -EINVAL;
522
523 ether_addr_copy(eth_addr, mac);
524
525 rcu_read_lock();
526
527 f = __vxlan_find_mac(vxlan, eth_addr, vni);
528 if (!f) {
529 rc = -ENOENT;
530 goto out;
531 }
532
533 rdst = first_remote_rcu(f);
534
535 memset(fdb_info, 0, sizeof(*fdb_info));
536 fdb_info->info.dev = dev;
537 fdb_info->remote_ip = rdst->remote_ip;
538 fdb_info->remote_port = rdst->remote_port;
539 fdb_info->remote_vni = rdst->remote_vni;
540 fdb_info->remote_ifindex = rdst->remote_ifindex;
541 fdb_info->vni = vni;
542 fdb_info->offloaded = rdst->offloaded;
543 ether_addr_copy(fdb_info->eth_addr, mac);
544
545 out:
546 rcu_read_unlock();
547 return rc;
548 }
549 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
550
551 /* Replace destination of unicast mac */
552 static int vxlan_fdb_replace(struct vxlan_fdb *f,
553 union vxlan_addr *ip, __be16 port, __be32 vni,
554 __u32 ifindex)
555 {
556 struct vxlan_rdst *rd;
557
558 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
559 if (rd)
560 return 0;
561
562 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
563 if (!rd)
564 return 0;
565
566 dst_cache_reset(&rd->dst_cache);
567 rd->remote_ip = *ip;
568 rd->remote_port = port;
569 rd->remote_vni = vni;
570 rd->remote_ifindex = ifindex;
571 return 1;
572 }
573
574 /* Add/update destinations for multicast */
575 static int vxlan_fdb_append(struct vxlan_fdb *f,
576 union vxlan_addr *ip, __be16 port, __be32 vni,
577 __u32 ifindex, struct vxlan_rdst **rdp)
578 {
579 struct vxlan_rdst *rd;
580
581 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
582 if (rd)
583 return 0;
584
585 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
586 if (rd == NULL)
587 return -ENOBUFS;
588
589 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
590 kfree(rd);
591 return -ENOBUFS;
592 }
593
594 rd->remote_ip = *ip;
595 rd->remote_port = port;
596 rd->offloaded = false;
597 rd->remote_vni = vni;
598 rd->remote_ifindex = ifindex;
599
600 list_add_tail_rcu(&rd->list, &f->remotes);
601
602 *rdp = rd;
603 return 1;
604 }
605
606 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
607 unsigned int off,
608 struct vxlanhdr *vh, size_t hdrlen,
609 __be32 vni_field,
610 struct gro_remcsum *grc,
611 bool nopartial)
612 {
613 size_t start, offset;
614
615 if (skb->remcsum_offload)
616 return vh;
617
618 if (!NAPI_GRO_CB(skb)->csum_valid)
619 return NULL;
620
621 start = vxlan_rco_start(vni_field);
622 offset = start + vxlan_rco_offset(vni_field);
623
624 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
625 start, offset, grc, nopartial);
626
627 skb->remcsum_offload = 1;
628
629 return vh;
630 }
631
632 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
633 struct list_head *head,
634 struct sk_buff *skb)
635 {
636 struct sk_buff *pp = NULL;
637 struct sk_buff *p;
638 struct vxlanhdr *vh, *vh2;
639 unsigned int hlen, off_vx;
640 int flush = 1;
641 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
642 __be32 flags;
643 struct gro_remcsum grc;
644
645 skb_gro_remcsum_init(&grc);
646
647 off_vx = skb_gro_offset(skb);
648 hlen = off_vx + sizeof(*vh);
649 vh = skb_gro_header_fast(skb, off_vx);
650 if (skb_gro_header_hard(skb, hlen)) {
651 vh = skb_gro_header_slow(skb, hlen, off_vx);
652 if (unlikely(!vh))
653 goto out;
654 }
655
656 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
657
658 flags = vh->vx_flags;
659
660 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
661 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
662 vh->vx_vni, &grc,
663 !!(vs->flags &
664 VXLAN_F_REMCSUM_NOPARTIAL));
665
666 if (!vh)
667 goto out;
668 }
669
670 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
671
672 list_for_each_entry(p, head, list) {
673 if (!NAPI_GRO_CB(p)->same_flow)
674 continue;
675
676 vh2 = (struct vxlanhdr *)(p->data + off_vx);
677 if (vh->vx_flags != vh2->vx_flags ||
678 vh->vx_vni != vh2->vx_vni) {
679 NAPI_GRO_CB(p)->same_flow = 0;
680 continue;
681 }
682 }
683
684 pp = call_gro_receive(eth_gro_receive, head, skb);
685 flush = 0;
686
687 out:
688 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
689
690 return pp;
691 }
692
693 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
694 {
695 /* Sets 'skb->inner_mac_header' since we are always called with
696 * 'skb->encapsulation' set.
697 */
698 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
699 }
700
701 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
702 const u8 *mac, __u16 state,
703 __be32 src_vni, __u8 ndm_flags)
704 {
705 struct vxlan_fdb *f;
706
707 f = kmalloc(sizeof(*f), GFP_ATOMIC);
708 if (!f)
709 return NULL;
710 f->state = state;
711 f->flags = ndm_flags;
712 f->updated = f->used = jiffies;
713 f->vni = src_vni;
714 INIT_LIST_HEAD(&f->remotes);
715 memcpy(f->eth_addr, mac, ETH_ALEN);
716
717 return f;
718 }
719
720 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
721 const u8 *mac, union vxlan_addr *ip,
722 __u16 state, __be16 port, __be32 src_vni,
723 __be32 vni, __u32 ifindex, __u8 ndm_flags,
724 struct vxlan_fdb **fdb)
725 {
726 struct vxlan_rdst *rd = NULL;
727 struct vxlan_fdb *f;
728 int rc;
729
730 if (vxlan->cfg.addrmax &&
731 vxlan->addrcnt >= vxlan->cfg.addrmax)
732 return -ENOSPC;
733
734 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
735 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
736 if (!f)
737 return -ENOMEM;
738
739 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
740 if (rc < 0) {
741 kfree(f);
742 return rc;
743 }
744
745 ++vxlan->addrcnt;
746 hlist_add_head_rcu(&f->hlist,
747 vxlan_fdb_head(vxlan, mac, src_vni));
748
749 *fdb = f;
750
751 return 0;
752 }
753
754 /* Add new entry to forwarding table -- assumes lock held */
755 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
756 const u8 *mac, union vxlan_addr *ip,
757 __u16 state, __u16 flags,
758 __be16 port, __be32 src_vni, __be32 vni,
759 __u32 ifindex, __u8 ndm_flags)
760 {
761 __u8 fdb_flags = (ndm_flags & ~NTF_USE);
762 struct vxlan_rdst *rd = NULL;
763 struct vxlan_fdb *f;
764 int notify = 0;
765 int rc;
766
767 f = __vxlan_find_mac(vxlan, mac, src_vni);
768 if (f) {
769 if (flags & NLM_F_EXCL) {
770 netdev_dbg(vxlan->dev,
771 "lost race to create %pM\n", mac);
772 return -EEXIST;
773 }
774 if (f->state != state) {
775 f->state = state;
776 f->updated = jiffies;
777 notify = 1;
778 }
779 if (f->flags != fdb_flags) {
780 f->flags = fdb_flags;
781 f->updated = jiffies;
782 notify = 1;
783 }
784 if ((flags & NLM_F_REPLACE)) {
785 /* Only change unicasts */
786 if (!(is_multicast_ether_addr(f->eth_addr) ||
787 is_zero_ether_addr(f->eth_addr))) {
788 notify |= vxlan_fdb_replace(f, ip, port, vni,
789 ifindex);
790 } else
791 return -EOPNOTSUPP;
792 }
793 if ((flags & NLM_F_APPEND) &&
794 (is_multicast_ether_addr(f->eth_addr) ||
795 is_zero_ether_addr(f->eth_addr))) {
796 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
797
798 if (rc < 0)
799 return rc;
800 notify |= rc;
801 }
802
803 if (ndm_flags & NTF_USE)
804 f->used = jiffies;
805 } else {
806 if (!(flags & NLM_F_CREATE))
807 return -ENOENT;
808
809 /* Disallow replace to add a multicast entry */
810 if ((flags & NLM_F_REPLACE) &&
811 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
812 return -EOPNOTSUPP;
813
814 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
815 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
816 vni, ifindex, fdb_flags, &f);
817 if (rc < 0)
818 return rc;
819 notify = 1;
820 }
821
822 if (notify) {
823 if (rd == NULL)
824 rd = first_remote_rtnl(f);
825 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
826 }
827
828 return 0;
829 }
830
831 static void vxlan_fdb_free(struct rcu_head *head)
832 {
833 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
834 struct vxlan_rdst *rd, *nd;
835
836 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
837 dst_cache_destroy(&rd->dst_cache);
838 kfree(rd);
839 }
840 kfree(f);
841 }
842
843 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
844 bool do_notify)
845 {
846 struct vxlan_rdst *rd;
847
848 netdev_dbg(vxlan->dev,
849 "delete %pM\n", f->eth_addr);
850
851 --vxlan->addrcnt;
852 if (do_notify)
853 list_for_each_entry(rd, &f->remotes, list)
854 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
855
856 hlist_del_rcu(&f->hlist);
857 call_rcu(&f->rcu, vxlan_fdb_free);
858 }
859
860 static void vxlan_dst_free(struct rcu_head *head)
861 {
862 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
863
864 dst_cache_destroy(&rd->dst_cache);
865 kfree(rd);
866 }
867
868 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
869 struct vxlan_rdst *rd)
870 {
871 list_del_rcu(&rd->list);
872 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
873 call_rcu(&rd->rcu, vxlan_dst_free);
874 }
875
876 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
877 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
878 __be32 *vni, u32 *ifindex)
879 {
880 struct net *net = dev_net(vxlan->dev);
881 int err;
882
883 if (tb[NDA_DST]) {
884 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
885 if (err)
886 return err;
887 } else {
888 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
889 if (remote->sa.sa_family == AF_INET) {
890 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
891 ip->sa.sa_family = AF_INET;
892 #if IS_ENABLED(CONFIG_IPV6)
893 } else {
894 ip->sin6.sin6_addr = in6addr_any;
895 ip->sa.sa_family = AF_INET6;
896 #endif
897 }
898 }
899
900 if (tb[NDA_PORT]) {
901 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
902 return -EINVAL;
903 *port = nla_get_be16(tb[NDA_PORT]);
904 } else {
905 *port = vxlan->cfg.dst_port;
906 }
907
908 if (tb[NDA_VNI]) {
909 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
910 return -EINVAL;
911 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
912 } else {
913 *vni = vxlan->default_dst.remote_vni;
914 }
915
916 if (tb[NDA_SRC_VNI]) {
917 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
918 return -EINVAL;
919 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
920 } else {
921 *src_vni = vxlan->default_dst.remote_vni;
922 }
923
924 if (tb[NDA_IFINDEX]) {
925 struct net_device *tdev;
926
927 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
928 return -EINVAL;
929 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
930 tdev = __dev_get_by_index(net, *ifindex);
931 if (!tdev)
932 return -EADDRNOTAVAIL;
933 } else {
934 *ifindex = 0;
935 }
936
937 return 0;
938 }
939
940 /* Add static entry (via netlink) */
941 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
942 struct net_device *dev,
943 const unsigned char *addr, u16 vid, u16 flags)
944 {
945 struct vxlan_dev *vxlan = netdev_priv(dev);
946 /* struct net *net = dev_net(vxlan->dev); */
947 union vxlan_addr ip;
948 __be16 port;
949 __be32 src_vni, vni;
950 u32 ifindex;
951 int err;
952
953 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
954 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
955 ndm->ndm_state);
956 return -EINVAL;
957 }
958
959 if (tb[NDA_DST] == NULL)
960 return -EINVAL;
961
962 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
963 if (err)
964 return err;
965
966 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
967 return -EAFNOSUPPORT;
968
969 spin_lock_bh(&vxlan->hash_lock);
970 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
971 port, src_vni, vni, ifindex, ndm->ndm_flags);
972 spin_unlock_bh(&vxlan->hash_lock);
973
974 return err;
975 }
976
977 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
978 const unsigned char *addr, union vxlan_addr ip,
979 __be16 port, __be32 src_vni, __be32 vni,
980 u32 ifindex, u16 vid)
981 {
982 struct vxlan_fdb *f;
983 struct vxlan_rdst *rd = NULL;
984 int err = -ENOENT;
985
986 f = vxlan_find_mac(vxlan, addr, src_vni);
987 if (!f)
988 return err;
989
990 if (!vxlan_addr_any(&ip)) {
991 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
992 if (!rd)
993 goto out;
994 }
995
996 /* remove a destination if it's not the only one on the list,
997 * otherwise destroy the fdb entry
998 */
999 if (rd && !list_is_singular(&f->remotes)) {
1000 vxlan_fdb_dst_destroy(vxlan, f, rd);
1001 goto out;
1002 }
1003
1004 vxlan_fdb_destroy(vxlan, f, true);
1005
1006 out:
1007 return 0;
1008 }
1009
1010 /* Delete entry (via netlink) */
1011 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1012 struct net_device *dev,
1013 const unsigned char *addr, u16 vid)
1014 {
1015 struct vxlan_dev *vxlan = netdev_priv(dev);
1016 union vxlan_addr ip;
1017 __be32 src_vni, vni;
1018 __be16 port;
1019 u32 ifindex;
1020 int err;
1021
1022 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1023 if (err)
1024 return err;
1025
1026 spin_lock_bh(&vxlan->hash_lock);
1027 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1028 vid);
1029 spin_unlock_bh(&vxlan->hash_lock);
1030
1031 return err;
1032 }
1033
1034 /* Dump forwarding table */
1035 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1036 struct net_device *dev,
1037 struct net_device *filter_dev, int *idx)
1038 {
1039 struct vxlan_dev *vxlan = netdev_priv(dev);
1040 unsigned int h;
1041 int err = 0;
1042
1043 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1044 struct vxlan_fdb *f;
1045
1046 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1047 struct vxlan_rdst *rd;
1048
1049 list_for_each_entry_rcu(rd, &f->remotes, list) {
1050 if (*idx < cb->args[2])
1051 goto skip;
1052
1053 err = vxlan_fdb_info(skb, vxlan, f,
1054 NETLINK_CB(cb->skb).portid,
1055 cb->nlh->nlmsg_seq,
1056 RTM_NEWNEIGH,
1057 NLM_F_MULTI, rd);
1058 if (err < 0)
1059 goto out;
1060 skip:
1061 *idx += 1;
1062 }
1063 }
1064 }
1065 out:
1066 return err;
1067 }
1068
1069 /* Watch incoming packets to learn mapping between Ethernet address
1070 * and Tunnel endpoint.
1071 * Return true if packet is bogus and should be dropped.
1072 */
1073 static bool vxlan_snoop(struct net_device *dev,
1074 union vxlan_addr *src_ip, const u8 *src_mac,
1075 u32 src_ifindex, __be32 vni)
1076 {
1077 struct vxlan_dev *vxlan = netdev_priv(dev);
1078 struct vxlan_fdb *f;
1079 u32 ifindex = 0;
1080
1081 #if IS_ENABLED(CONFIG_IPV6)
1082 if (src_ip->sa.sa_family == AF_INET6 &&
1083 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1084 ifindex = src_ifindex;
1085 #endif
1086
1087 f = vxlan_find_mac(vxlan, src_mac, vni);
1088 if (likely(f)) {
1089 struct vxlan_rdst *rdst = first_remote_rcu(f);
1090
1091 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1092 rdst->remote_ifindex == ifindex))
1093 return false;
1094
1095 /* Don't migrate static entries, drop packets */
1096 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1097 return true;
1098
1099 if (net_ratelimit())
1100 netdev_info(dev,
1101 "%pM migrated from %pIS to %pIS\n",
1102 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1103
1104 rdst->remote_ip = *src_ip;
1105 f->updated = jiffies;
1106 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1107 } else {
1108 /* learned new entry */
1109 spin_lock(&vxlan->hash_lock);
1110
1111 /* close off race between vxlan_flush and incoming packets */
1112 if (netif_running(dev))
1113 vxlan_fdb_update(vxlan, src_mac, src_ip,
1114 NUD_REACHABLE,
1115 NLM_F_EXCL|NLM_F_CREATE,
1116 vxlan->cfg.dst_port,
1117 vni,
1118 vxlan->default_dst.remote_vni,
1119 ifindex, NTF_SELF);
1120 spin_unlock(&vxlan->hash_lock);
1121 }
1122
1123 return false;
1124 }
1125
1126 /* See if multicast group is already in use by other ID */
1127 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1128 {
1129 struct vxlan_dev *vxlan;
1130 struct vxlan_sock *sock4;
1131 #if IS_ENABLED(CONFIG_IPV6)
1132 struct vxlan_sock *sock6;
1133 #endif
1134 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1135
1136 sock4 = rtnl_dereference(dev->vn4_sock);
1137
1138 /* The vxlan_sock is only used by dev, leaving group has
1139 * no effect on other vxlan devices.
1140 */
1141 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1142 return false;
1143 #if IS_ENABLED(CONFIG_IPV6)
1144 sock6 = rtnl_dereference(dev->vn6_sock);
1145 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1146 return false;
1147 #endif
1148
1149 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1150 if (!netif_running(vxlan->dev) || vxlan == dev)
1151 continue;
1152
1153 if (family == AF_INET &&
1154 rtnl_dereference(vxlan->vn4_sock) != sock4)
1155 continue;
1156 #if IS_ENABLED(CONFIG_IPV6)
1157 if (family == AF_INET6 &&
1158 rtnl_dereference(vxlan->vn6_sock) != sock6)
1159 continue;
1160 #endif
1161
1162 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1163 &dev->default_dst.remote_ip))
1164 continue;
1165
1166 if (vxlan->default_dst.remote_ifindex !=
1167 dev->default_dst.remote_ifindex)
1168 continue;
1169
1170 return true;
1171 }
1172
1173 return false;
1174 }
1175
1176 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1177 {
1178 struct vxlan_net *vn;
1179
1180 if (!vs)
1181 return false;
1182 if (!refcount_dec_and_test(&vs->refcnt))
1183 return false;
1184
1185 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1186 spin_lock(&vn->sock_lock);
1187 hlist_del_rcu(&vs->hlist);
1188 udp_tunnel_notify_del_rx_port(vs->sock,
1189 (vs->flags & VXLAN_F_GPE) ?
1190 UDP_TUNNEL_TYPE_VXLAN_GPE :
1191 UDP_TUNNEL_TYPE_VXLAN);
1192 spin_unlock(&vn->sock_lock);
1193
1194 return true;
1195 }
1196
1197 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1198 {
1199 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1200 #if IS_ENABLED(CONFIG_IPV6)
1201 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1202
1203 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1204 #endif
1205
1206 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1207 synchronize_net();
1208
1209 vxlan_vs_del_dev(vxlan);
1210
1211 if (__vxlan_sock_release_prep(sock4)) {
1212 udp_tunnel_sock_release(sock4->sock);
1213 kfree(sock4);
1214 }
1215
1216 #if IS_ENABLED(CONFIG_IPV6)
1217 if (__vxlan_sock_release_prep(sock6)) {
1218 udp_tunnel_sock_release(sock6->sock);
1219 kfree(sock6);
1220 }
1221 #endif
1222 }
1223
1224 /* Update multicast group membership when first VNI on
1225 * multicast address is brought up
1226 */
1227 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1228 {
1229 struct sock *sk;
1230 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1231 int ifindex = vxlan->default_dst.remote_ifindex;
1232 int ret = -EINVAL;
1233
1234 if (ip->sa.sa_family == AF_INET) {
1235 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1236 struct ip_mreqn mreq = {
1237 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1238 .imr_ifindex = ifindex,
1239 };
1240
1241 sk = sock4->sock->sk;
1242 lock_sock(sk);
1243 ret = ip_mc_join_group(sk, &mreq);
1244 release_sock(sk);
1245 #if IS_ENABLED(CONFIG_IPV6)
1246 } else {
1247 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1248
1249 sk = sock6->sock->sk;
1250 lock_sock(sk);
1251 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1252 &ip->sin6.sin6_addr);
1253 release_sock(sk);
1254 #endif
1255 }
1256
1257 return ret;
1258 }
1259
1260 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1261 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1262 {
1263 struct sock *sk;
1264 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1265 int ifindex = vxlan->default_dst.remote_ifindex;
1266 int ret = -EINVAL;
1267
1268 if (ip->sa.sa_family == AF_INET) {
1269 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1270 struct ip_mreqn mreq = {
1271 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1272 .imr_ifindex = ifindex,
1273 };
1274
1275 sk = sock4->sock->sk;
1276 lock_sock(sk);
1277 ret = ip_mc_leave_group(sk, &mreq);
1278 release_sock(sk);
1279 #if IS_ENABLED(CONFIG_IPV6)
1280 } else {
1281 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1282
1283 sk = sock6->sock->sk;
1284 lock_sock(sk);
1285 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1286 &ip->sin6.sin6_addr);
1287 release_sock(sk);
1288 #endif
1289 }
1290
1291 return ret;
1292 }
1293
1294 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1295 struct sk_buff *skb, u32 vxflags)
1296 {
1297 size_t start, offset;
1298
1299 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1300 goto out;
1301
1302 start = vxlan_rco_start(unparsed->vx_vni);
1303 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1304
1305 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1306 return false;
1307
1308 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1309 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1310 out:
1311 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1312 unparsed->vx_vni &= VXLAN_VNI_MASK;
1313 return true;
1314 }
1315
1316 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1317 struct sk_buff *skb, u32 vxflags,
1318 struct vxlan_metadata *md)
1319 {
1320 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1321 struct metadata_dst *tun_dst;
1322
1323 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1324 goto out;
1325
1326 md->gbp = ntohs(gbp->policy_id);
1327
1328 tun_dst = (struct metadata_dst *)skb_dst(skb);
1329 if (tun_dst) {
1330 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1331 tun_dst->u.tun_info.options_len = sizeof(*md);
1332 }
1333 if (gbp->dont_learn)
1334 md->gbp |= VXLAN_GBP_DONT_LEARN;
1335
1336 if (gbp->policy_applied)
1337 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1338
1339 /* In flow-based mode, GBP is carried in dst_metadata */
1340 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1341 skb->mark = md->gbp;
1342 out:
1343 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1344 }
1345
1346 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1347 __be16 *protocol,
1348 struct sk_buff *skb, u32 vxflags)
1349 {
1350 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1351
1352 /* Need to have Next Protocol set for interfaces in GPE mode. */
1353 if (!gpe->np_applied)
1354 return false;
1355 /* "The initial version is 0. If a receiver does not support the
1356 * version indicated it MUST drop the packet.
1357 */
1358 if (gpe->version != 0)
1359 return false;
1360 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1361 * processing MUST occur." However, we don't implement OAM
1362 * processing, thus drop the packet.
1363 */
1364 if (gpe->oam_flag)
1365 return false;
1366
1367 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1368 if (!*protocol)
1369 return false;
1370
1371 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1372 return true;
1373 }
1374
1375 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1376 struct vxlan_sock *vs,
1377 struct sk_buff *skb, __be32 vni)
1378 {
1379 union vxlan_addr saddr;
1380 u32 ifindex = skb->dev->ifindex;
1381
1382 skb_reset_mac_header(skb);
1383 skb->protocol = eth_type_trans(skb, vxlan->dev);
1384 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1385
1386 /* Ignore packet loops (and multicast echo) */
1387 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1388 return false;
1389
1390 /* Get address from the outer IP header */
1391 if (vxlan_get_sk_family(vs) == AF_INET) {
1392 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1393 saddr.sa.sa_family = AF_INET;
1394 #if IS_ENABLED(CONFIG_IPV6)
1395 } else {
1396 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1397 saddr.sa.sa_family = AF_INET6;
1398 #endif
1399 }
1400
1401 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1402 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1403 return false;
1404
1405 return true;
1406 }
1407
1408 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1409 struct sk_buff *skb)
1410 {
1411 int err = 0;
1412
1413 if (vxlan_get_sk_family(vs) == AF_INET)
1414 err = IP_ECN_decapsulate(oiph, skb);
1415 #if IS_ENABLED(CONFIG_IPV6)
1416 else
1417 err = IP6_ECN_decapsulate(oiph, skb);
1418 #endif
1419
1420 if (unlikely(err) && log_ecn_error) {
1421 if (vxlan_get_sk_family(vs) == AF_INET)
1422 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1423 &((struct iphdr *)oiph)->saddr,
1424 ((struct iphdr *)oiph)->tos);
1425 else
1426 net_info_ratelimited("non-ECT from %pI6\n",
1427 &((struct ipv6hdr *)oiph)->saddr);
1428 }
1429 return err <= 1;
1430 }
1431
1432 /* Callback from net/ipv4/udp.c to receive packets */
1433 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1434 {
1435 struct pcpu_sw_netstats *stats;
1436 struct vxlan_dev *vxlan;
1437 struct vxlan_sock *vs;
1438 struct vxlanhdr unparsed;
1439 struct vxlan_metadata _md;
1440 struct vxlan_metadata *md = &_md;
1441 __be16 protocol = htons(ETH_P_TEB);
1442 bool raw_proto = false;
1443 void *oiph;
1444 __be32 vni = 0;
1445
1446 /* Need UDP and VXLAN header to be present */
1447 if (!pskb_may_pull(skb, VXLAN_HLEN))
1448 goto drop;
1449
1450 unparsed = *vxlan_hdr(skb);
1451 /* VNI flag always required to be set */
1452 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1453 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1454 ntohl(vxlan_hdr(skb)->vx_flags),
1455 ntohl(vxlan_hdr(skb)->vx_vni));
1456 /* Return non vxlan pkt */
1457 goto drop;
1458 }
1459 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1460 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1461
1462 vs = rcu_dereference_sk_user_data(sk);
1463 if (!vs)
1464 goto drop;
1465
1466 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1467
1468 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1469 if (!vxlan)
1470 goto drop;
1471
1472 /* For backwards compatibility, only allow reserved fields to be
1473 * used by VXLAN extensions if explicitly requested.
1474 */
1475 if (vs->flags & VXLAN_F_GPE) {
1476 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1477 goto drop;
1478 raw_proto = true;
1479 }
1480
1481 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1482 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1483 goto drop;
1484
1485 if (vxlan_collect_metadata(vs)) {
1486 struct metadata_dst *tun_dst;
1487
1488 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1489 key32_to_tunnel_id(vni), sizeof(*md));
1490
1491 if (!tun_dst)
1492 goto drop;
1493
1494 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1495
1496 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1497 } else {
1498 memset(md, 0, sizeof(*md));
1499 }
1500
1501 if (vs->flags & VXLAN_F_REMCSUM_RX)
1502 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1503 goto drop;
1504 if (vs->flags & VXLAN_F_GBP)
1505 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1506 /* Note that GBP and GPE can never be active together. This is
1507 * ensured in vxlan_dev_configure.
1508 */
1509
1510 if (unparsed.vx_flags || unparsed.vx_vni) {
1511 /* If there are any unprocessed flags remaining treat
1512 * this as a malformed packet. This behavior diverges from
1513 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1514 * in reserved fields are to be ignored. The approach here
1515 * maintains compatibility with previous stack code, and also
1516 * is more robust and provides a little more security in
1517 * adding extensions to VXLAN.
1518 */
1519 goto drop;
1520 }
1521
1522 if (!raw_proto) {
1523 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1524 goto drop;
1525 } else {
1526 skb_reset_mac_header(skb);
1527 skb->dev = vxlan->dev;
1528 skb->pkt_type = PACKET_HOST;
1529 }
1530
1531 oiph = skb_network_header(skb);
1532 skb_reset_network_header(skb);
1533
1534 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1535 ++vxlan->dev->stats.rx_frame_errors;
1536 ++vxlan->dev->stats.rx_errors;
1537 goto drop;
1538 }
1539
1540 stats = this_cpu_ptr(vxlan->dev->tstats);
1541 u64_stats_update_begin(&stats->syncp);
1542 stats->rx_packets++;
1543 stats->rx_bytes += skb->len;
1544 u64_stats_update_end(&stats->syncp);
1545
1546 gro_cells_receive(&vxlan->gro_cells, skb);
1547 return 0;
1548
1549 drop:
1550 /* Consume bad packet */
1551 kfree_skb(skb);
1552 return 0;
1553 }
1554
1555 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1556 {
1557 struct vxlan_dev *vxlan = netdev_priv(dev);
1558 struct arphdr *parp;
1559 u8 *arpptr, *sha;
1560 __be32 sip, tip;
1561 struct neighbour *n;
1562
1563 if (dev->flags & IFF_NOARP)
1564 goto out;
1565
1566 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1567 dev->stats.tx_dropped++;
1568 goto out;
1569 }
1570 parp = arp_hdr(skb);
1571
1572 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1573 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1574 parp->ar_pro != htons(ETH_P_IP) ||
1575 parp->ar_op != htons(ARPOP_REQUEST) ||
1576 parp->ar_hln != dev->addr_len ||
1577 parp->ar_pln != 4)
1578 goto out;
1579 arpptr = (u8 *)parp + sizeof(struct arphdr);
1580 sha = arpptr;
1581 arpptr += dev->addr_len; /* sha */
1582 memcpy(&sip, arpptr, sizeof(sip));
1583 arpptr += sizeof(sip);
1584 arpptr += dev->addr_len; /* tha */
1585 memcpy(&tip, arpptr, sizeof(tip));
1586
1587 if (ipv4_is_loopback(tip) ||
1588 ipv4_is_multicast(tip))
1589 goto out;
1590
1591 n = neigh_lookup(&arp_tbl, &tip, dev);
1592
1593 if (n) {
1594 struct vxlan_fdb *f;
1595 struct sk_buff *reply;
1596
1597 if (!(n->nud_state & NUD_CONNECTED)) {
1598 neigh_release(n);
1599 goto out;
1600 }
1601
1602 f = vxlan_find_mac(vxlan, n->ha, vni);
1603 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1604 /* bridge-local neighbor */
1605 neigh_release(n);
1606 goto out;
1607 }
1608
1609 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1610 n->ha, sha);
1611
1612 neigh_release(n);
1613
1614 if (reply == NULL)
1615 goto out;
1616
1617 skb_reset_mac_header(reply);
1618 __skb_pull(reply, skb_network_offset(reply));
1619 reply->ip_summed = CHECKSUM_UNNECESSARY;
1620 reply->pkt_type = PACKET_HOST;
1621
1622 if (netif_rx_ni(reply) == NET_RX_DROP)
1623 dev->stats.rx_dropped++;
1624 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1625 union vxlan_addr ipa = {
1626 .sin.sin_addr.s_addr = tip,
1627 .sin.sin_family = AF_INET,
1628 };
1629
1630 vxlan_ip_miss(dev, &ipa);
1631 }
1632 out:
1633 consume_skb(skb);
1634 return NETDEV_TX_OK;
1635 }
1636
1637 #if IS_ENABLED(CONFIG_IPV6)
1638 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1639 struct neighbour *n, bool isrouter)
1640 {
1641 struct net_device *dev = request->dev;
1642 struct sk_buff *reply;
1643 struct nd_msg *ns, *na;
1644 struct ipv6hdr *pip6;
1645 u8 *daddr;
1646 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1647 int ns_olen;
1648 int i, len;
1649
1650 if (dev == NULL || !pskb_may_pull(request, request->len))
1651 return NULL;
1652
1653 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1654 sizeof(*na) + na_olen + dev->needed_tailroom;
1655 reply = alloc_skb(len, GFP_ATOMIC);
1656 if (reply == NULL)
1657 return NULL;
1658
1659 reply->protocol = htons(ETH_P_IPV6);
1660 reply->dev = dev;
1661 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1662 skb_push(reply, sizeof(struct ethhdr));
1663 skb_reset_mac_header(reply);
1664
1665 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1666
1667 daddr = eth_hdr(request)->h_source;
1668 ns_olen = request->len - skb_network_offset(request) -
1669 sizeof(struct ipv6hdr) - sizeof(*ns);
1670 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1671 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1672 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1673 break;
1674 }
1675 }
1676
1677 /* Ethernet header */
1678 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1679 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1680 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1681 reply->protocol = htons(ETH_P_IPV6);
1682
1683 skb_pull(reply, sizeof(struct ethhdr));
1684 skb_reset_network_header(reply);
1685 skb_put(reply, sizeof(struct ipv6hdr));
1686
1687 /* IPv6 header */
1688
1689 pip6 = ipv6_hdr(reply);
1690 memset(pip6, 0, sizeof(struct ipv6hdr));
1691 pip6->version = 6;
1692 pip6->priority = ipv6_hdr(request)->priority;
1693 pip6->nexthdr = IPPROTO_ICMPV6;
1694 pip6->hop_limit = 255;
1695 pip6->daddr = ipv6_hdr(request)->saddr;
1696 pip6->saddr = *(struct in6_addr *)n->primary_key;
1697
1698 skb_pull(reply, sizeof(struct ipv6hdr));
1699 skb_reset_transport_header(reply);
1700
1701 /* Neighbor Advertisement */
1702 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1703 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1704 na->icmph.icmp6_router = isrouter;
1705 na->icmph.icmp6_override = 1;
1706 na->icmph.icmp6_solicited = 1;
1707 na->target = ns->target;
1708 ether_addr_copy(&na->opt[2], n->ha);
1709 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1710 na->opt[1] = na_olen >> 3;
1711
1712 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1713 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1714 csum_partial(na, sizeof(*na)+na_olen, 0));
1715
1716 pip6->payload_len = htons(sizeof(*na)+na_olen);
1717
1718 skb_push(reply, sizeof(struct ipv6hdr));
1719
1720 reply->ip_summed = CHECKSUM_UNNECESSARY;
1721
1722 return reply;
1723 }
1724
1725 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1726 {
1727 struct vxlan_dev *vxlan = netdev_priv(dev);
1728 const struct in6_addr *daddr;
1729 const struct ipv6hdr *iphdr;
1730 struct inet6_dev *in6_dev;
1731 struct neighbour *n;
1732 struct nd_msg *msg;
1733
1734 in6_dev = __in6_dev_get(dev);
1735 if (!in6_dev)
1736 goto out;
1737
1738 iphdr = ipv6_hdr(skb);
1739 daddr = &iphdr->daddr;
1740 msg = (struct nd_msg *)(iphdr + 1);
1741
1742 if (ipv6_addr_loopback(daddr) ||
1743 ipv6_addr_is_multicast(&msg->target))
1744 goto out;
1745
1746 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1747
1748 if (n) {
1749 struct vxlan_fdb *f;
1750 struct sk_buff *reply;
1751
1752 if (!(n->nud_state & NUD_CONNECTED)) {
1753 neigh_release(n);
1754 goto out;
1755 }
1756
1757 f = vxlan_find_mac(vxlan, n->ha, vni);
1758 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1759 /* bridge-local neighbor */
1760 neigh_release(n);
1761 goto out;
1762 }
1763
1764 reply = vxlan_na_create(skb, n,
1765 !!(f ? f->flags & NTF_ROUTER : 0));
1766
1767 neigh_release(n);
1768
1769 if (reply == NULL)
1770 goto out;
1771
1772 if (netif_rx_ni(reply) == NET_RX_DROP)
1773 dev->stats.rx_dropped++;
1774
1775 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1776 union vxlan_addr ipa = {
1777 .sin6.sin6_addr = msg->target,
1778 .sin6.sin6_family = AF_INET6,
1779 };
1780
1781 vxlan_ip_miss(dev, &ipa);
1782 }
1783
1784 out:
1785 consume_skb(skb);
1786 return NETDEV_TX_OK;
1787 }
1788 #endif
1789
1790 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1791 {
1792 struct vxlan_dev *vxlan = netdev_priv(dev);
1793 struct neighbour *n;
1794
1795 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1796 return false;
1797
1798 n = NULL;
1799 switch (ntohs(eth_hdr(skb)->h_proto)) {
1800 case ETH_P_IP:
1801 {
1802 struct iphdr *pip;
1803
1804 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1805 return false;
1806 pip = ip_hdr(skb);
1807 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1808 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1809 union vxlan_addr ipa = {
1810 .sin.sin_addr.s_addr = pip->daddr,
1811 .sin.sin_family = AF_INET,
1812 };
1813
1814 vxlan_ip_miss(dev, &ipa);
1815 return false;
1816 }
1817
1818 break;
1819 }
1820 #if IS_ENABLED(CONFIG_IPV6)
1821 case ETH_P_IPV6:
1822 {
1823 struct ipv6hdr *pip6;
1824
1825 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1826 return false;
1827 pip6 = ipv6_hdr(skb);
1828 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1829 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1830 union vxlan_addr ipa = {
1831 .sin6.sin6_addr = pip6->daddr,
1832 .sin6.sin6_family = AF_INET6,
1833 };
1834
1835 vxlan_ip_miss(dev, &ipa);
1836 return false;
1837 }
1838
1839 break;
1840 }
1841 #endif
1842 default:
1843 return false;
1844 }
1845
1846 if (n) {
1847 bool diff;
1848
1849 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1850 if (diff) {
1851 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1852 dev->addr_len);
1853 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1854 }
1855 neigh_release(n);
1856 return diff;
1857 }
1858
1859 return false;
1860 }
1861
1862 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1863 struct vxlan_metadata *md)
1864 {
1865 struct vxlanhdr_gbp *gbp;
1866
1867 if (!md->gbp)
1868 return;
1869
1870 gbp = (struct vxlanhdr_gbp *)vxh;
1871 vxh->vx_flags |= VXLAN_HF_GBP;
1872
1873 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1874 gbp->dont_learn = 1;
1875
1876 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1877 gbp->policy_applied = 1;
1878
1879 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1880 }
1881
1882 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1883 __be16 protocol)
1884 {
1885 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1886
1887 gpe->np_applied = 1;
1888 gpe->next_protocol = tun_p_from_eth_p(protocol);
1889 if (!gpe->next_protocol)
1890 return -EPFNOSUPPORT;
1891 return 0;
1892 }
1893
1894 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1895 int iphdr_len, __be32 vni,
1896 struct vxlan_metadata *md, u32 vxflags,
1897 bool udp_sum)
1898 {
1899 struct vxlanhdr *vxh;
1900 int min_headroom;
1901 int err;
1902 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1903 __be16 inner_protocol = htons(ETH_P_TEB);
1904
1905 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1906 skb->ip_summed == CHECKSUM_PARTIAL) {
1907 int csum_start = skb_checksum_start_offset(skb);
1908
1909 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1910 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1911 (skb->csum_offset == offsetof(struct udphdr, check) ||
1912 skb->csum_offset == offsetof(struct tcphdr, check)))
1913 type |= SKB_GSO_TUNNEL_REMCSUM;
1914 }
1915
1916 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1917 + VXLAN_HLEN + iphdr_len;
1918
1919 /* Need space for new headers (invalidates iph ptr) */
1920 err = skb_cow_head(skb, min_headroom);
1921 if (unlikely(err))
1922 return err;
1923
1924 err = iptunnel_handle_offloads(skb, type);
1925 if (err)
1926 return err;
1927
1928 vxh = __skb_push(skb, sizeof(*vxh));
1929 vxh->vx_flags = VXLAN_HF_VNI;
1930 vxh->vx_vni = vxlan_vni_field(vni);
1931
1932 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1933 unsigned int start;
1934
1935 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1936 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1937 vxh->vx_flags |= VXLAN_HF_RCO;
1938
1939 if (!skb_is_gso(skb)) {
1940 skb->ip_summed = CHECKSUM_NONE;
1941 skb->encapsulation = 0;
1942 }
1943 }
1944
1945 if (vxflags & VXLAN_F_GBP)
1946 vxlan_build_gbp_hdr(vxh, vxflags, md);
1947 if (vxflags & VXLAN_F_GPE) {
1948 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1949 if (err < 0)
1950 return err;
1951 inner_protocol = skb->protocol;
1952 }
1953
1954 skb_set_inner_protocol(skb, inner_protocol);
1955 return 0;
1956 }
1957
1958 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1959 struct vxlan_sock *sock4,
1960 struct sk_buff *skb, int oif, u8 tos,
1961 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1962 struct dst_cache *dst_cache,
1963 const struct ip_tunnel_info *info)
1964 {
1965 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1966 struct rtable *rt = NULL;
1967 struct flowi4 fl4;
1968
1969 if (!sock4)
1970 return ERR_PTR(-EIO);
1971
1972 if (tos && !info)
1973 use_cache = false;
1974 if (use_cache) {
1975 rt = dst_cache_get_ip4(dst_cache, saddr);
1976 if (rt)
1977 return rt;
1978 }
1979
1980 memset(&fl4, 0, sizeof(fl4));
1981 fl4.flowi4_oif = oif;
1982 fl4.flowi4_tos = RT_TOS(tos);
1983 fl4.flowi4_mark = skb->mark;
1984 fl4.flowi4_proto = IPPROTO_UDP;
1985 fl4.daddr = daddr;
1986 fl4.saddr = *saddr;
1987 fl4.fl4_dport = dport;
1988 fl4.fl4_sport = sport;
1989
1990 rt = ip_route_output_key(vxlan->net, &fl4);
1991 if (likely(!IS_ERR(rt))) {
1992 if (rt->dst.dev == dev) {
1993 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1994 ip_rt_put(rt);
1995 return ERR_PTR(-ELOOP);
1996 }
1997
1998 *saddr = fl4.saddr;
1999 if (use_cache)
2000 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2001 } else {
2002 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2003 return ERR_PTR(-ENETUNREACH);
2004 }
2005 return rt;
2006 }
2007
2008 #if IS_ENABLED(CONFIG_IPV6)
2009 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2010 struct net_device *dev,
2011 struct vxlan_sock *sock6,
2012 struct sk_buff *skb, int oif, u8 tos,
2013 __be32 label,
2014 const struct in6_addr *daddr,
2015 struct in6_addr *saddr,
2016 __be16 dport, __be16 sport,
2017 struct dst_cache *dst_cache,
2018 const struct ip_tunnel_info *info)
2019 {
2020 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2021 struct dst_entry *ndst;
2022 struct flowi6 fl6;
2023 int err;
2024
2025 if (!sock6)
2026 return ERR_PTR(-EIO);
2027
2028 if (tos && !info)
2029 use_cache = false;
2030 if (use_cache) {
2031 ndst = dst_cache_get_ip6(dst_cache, saddr);
2032 if (ndst)
2033 return ndst;
2034 }
2035
2036 memset(&fl6, 0, sizeof(fl6));
2037 fl6.flowi6_oif = oif;
2038 fl6.daddr = *daddr;
2039 fl6.saddr = *saddr;
2040 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2041 fl6.flowi6_mark = skb->mark;
2042 fl6.flowi6_proto = IPPROTO_UDP;
2043 fl6.fl6_dport = dport;
2044 fl6.fl6_sport = sport;
2045
2046 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2047 sock6->sock->sk,
2048 &ndst, &fl6);
2049 if (unlikely(err < 0)) {
2050 netdev_dbg(dev, "no route to %pI6\n", daddr);
2051 return ERR_PTR(-ENETUNREACH);
2052 }
2053
2054 if (unlikely(ndst->dev == dev)) {
2055 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2056 dst_release(ndst);
2057 return ERR_PTR(-ELOOP);
2058 }
2059
2060 *saddr = fl6.saddr;
2061 if (use_cache)
2062 dst_cache_set_ip6(dst_cache, ndst, saddr);
2063 return ndst;
2064 }
2065 #endif
2066
2067 /* Bypass encapsulation if the destination is local */
2068 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2069 struct vxlan_dev *dst_vxlan, __be32 vni)
2070 {
2071 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2072 union vxlan_addr loopback;
2073 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2074 struct net_device *dev = skb->dev;
2075 int len = skb->len;
2076
2077 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2078 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2079 skb->pkt_type = PACKET_HOST;
2080 skb->encapsulation = 0;
2081 skb->dev = dst_vxlan->dev;
2082 __skb_pull(skb, skb_network_offset(skb));
2083
2084 if (remote_ip->sa.sa_family == AF_INET) {
2085 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2086 loopback.sa.sa_family = AF_INET;
2087 #if IS_ENABLED(CONFIG_IPV6)
2088 } else {
2089 loopback.sin6.sin6_addr = in6addr_loopback;
2090 loopback.sa.sa_family = AF_INET6;
2091 #endif
2092 }
2093
2094 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2095 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2096 vni);
2097
2098 u64_stats_update_begin(&tx_stats->syncp);
2099 tx_stats->tx_packets++;
2100 tx_stats->tx_bytes += len;
2101 u64_stats_update_end(&tx_stats->syncp);
2102
2103 if (netif_rx(skb) == NET_RX_SUCCESS) {
2104 u64_stats_update_begin(&rx_stats->syncp);
2105 rx_stats->rx_packets++;
2106 rx_stats->rx_bytes += len;
2107 u64_stats_update_end(&rx_stats->syncp);
2108 } else {
2109 dev->stats.rx_dropped++;
2110 }
2111 }
2112
2113 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2114 struct vxlan_dev *vxlan,
2115 union vxlan_addr *daddr,
2116 __be16 dst_port, int dst_ifindex, __be32 vni,
2117 struct dst_entry *dst,
2118 u32 rt_flags)
2119 {
2120 #if IS_ENABLED(CONFIG_IPV6)
2121 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2122 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2123 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2124 */
2125 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2126 #endif
2127 /* Bypass encapsulation if the destination is local */
2128 if (rt_flags & RTCF_LOCAL &&
2129 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2130 struct vxlan_dev *dst_vxlan;
2131
2132 dst_release(dst);
2133 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2134 daddr->sa.sa_family, dst_port,
2135 vxlan->cfg.flags);
2136 if (!dst_vxlan) {
2137 dev->stats.tx_errors++;
2138 kfree_skb(skb);
2139
2140 return -ENOENT;
2141 }
2142 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2143 return 1;
2144 }
2145
2146 return 0;
2147 }
2148
2149 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2150 __be32 default_vni, struct vxlan_rdst *rdst,
2151 bool did_rsc)
2152 {
2153 struct dst_cache *dst_cache;
2154 struct ip_tunnel_info *info;
2155 struct vxlan_dev *vxlan = netdev_priv(dev);
2156 const struct iphdr *old_iph = ip_hdr(skb);
2157 union vxlan_addr *dst;
2158 union vxlan_addr remote_ip, local_ip;
2159 struct vxlan_metadata _md;
2160 struct vxlan_metadata *md = &_md;
2161 __be16 src_port = 0, dst_port;
2162 struct dst_entry *ndst = NULL;
2163 __be32 vni, label;
2164 __u8 tos, ttl;
2165 int ifindex;
2166 int err;
2167 u32 flags = vxlan->cfg.flags;
2168 bool udp_sum = false;
2169 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2170
2171 info = skb_tunnel_info(skb);
2172
2173 if (rdst) {
2174 dst = &rdst->remote_ip;
2175 if (vxlan_addr_any(dst)) {
2176 if (did_rsc) {
2177 /* short-circuited back to local bridge */
2178 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2179 return;
2180 }
2181 goto drop;
2182 }
2183
2184 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2185 vni = (rdst->remote_vni) ? : default_vni;
2186 ifindex = rdst->remote_ifindex;
2187 local_ip = vxlan->cfg.saddr;
2188 dst_cache = &rdst->dst_cache;
2189 md->gbp = skb->mark;
2190 if (flags & VXLAN_F_TTL_INHERIT) {
2191 ttl = ip_tunnel_get_ttl(old_iph, skb);
2192 } else {
2193 ttl = vxlan->cfg.ttl;
2194 if (!ttl && vxlan_addr_multicast(dst))
2195 ttl = 1;
2196 }
2197
2198 tos = vxlan->cfg.tos;
2199 if (tos == 1)
2200 tos = ip_tunnel_get_dsfield(old_iph, skb);
2201
2202 if (dst->sa.sa_family == AF_INET)
2203 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2204 else
2205 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2206 label = vxlan->cfg.label;
2207 } else {
2208 if (!info) {
2209 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2210 dev->name);
2211 goto drop;
2212 }
2213 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2214 if (remote_ip.sa.sa_family == AF_INET) {
2215 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2216 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2217 } else {
2218 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2219 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2220 }
2221 dst = &remote_ip;
2222 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2223 vni = tunnel_id_to_key32(info->key.tun_id);
2224 ifindex = 0;
2225 dst_cache = &info->dst_cache;
2226 if (info->options_len &&
2227 info->key.tun_flags & TUNNEL_VXLAN_OPT)
2228 md = ip_tunnel_info_opts(info);
2229 ttl = info->key.ttl;
2230 tos = info->key.tos;
2231 label = info->key.label;
2232 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2233 }
2234 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2235 vxlan->cfg.port_max, true);
2236
2237 rcu_read_lock();
2238 if (dst->sa.sa_family == AF_INET) {
2239 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2240 struct rtable *rt;
2241 __be16 df = 0;
2242
2243 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2244 dst->sin.sin_addr.s_addr,
2245 &local_ip.sin.sin_addr.s_addr,
2246 dst_port, src_port,
2247 dst_cache, info);
2248 if (IS_ERR(rt)) {
2249 err = PTR_ERR(rt);
2250 goto tx_error;
2251 }
2252
2253 /* Bypass encapsulation if the destination is local */
2254 if (!info) {
2255 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2256 dst_port, ifindex, vni,
2257 &rt->dst, rt->rt_flags);
2258 if (err)
2259 goto out_unlock;
2260 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2261 df = htons(IP_DF);
2262 }
2263
2264 ndst = &rt->dst;
2265 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2266
2267 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2268 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2269 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2270 vni, md, flags, udp_sum);
2271 if (err < 0)
2272 goto tx_error;
2273
2274 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2275 dst->sin.sin_addr.s_addr, tos, ttl, df,
2276 src_port, dst_port, xnet, !udp_sum);
2277 #if IS_ENABLED(CONFIG_IPV6)
2278 } else {
2279 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2280
2281 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2282 label, &dst->sin6.sin6_addr,
2283 &local_ip.sin6.sin6_addr,
2284 dst_port, src_port,
2285 dst_cache, info);
2286 if (IS_ERR(ndst)) {
2287 err = PTR_ERR(ndst);
2288 ndst = NULL;
2289 goto tx_error;
2290 }
2291
2292 if (!info) {
2293 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2294
2295 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2296 dst_port, ifindex, vni,
2297 ndst, rt6i_flags);
2298 if (err)
2299 goto out_unlock;
2300 }
2301
2302 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2303
2304 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2305 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2306 skb_scrub_packet(skb, xnet);
2307 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2308 vni, md, flags, udp_sum);
2309 if (err < 0)
2310 goto tx_error;
2311
2312 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2313 &local_ip.sin6.sin6_addr,
2314 &dst->sin6.sin6_addr, tos, ttl,
2315 label, src_port, dst_port, !udp_sum);
2316 #endif
2317 }
2318 out_unlock:
2319 rcu_read_unlock();
2320 return;
2321
2322 drop:
2323 dev->stats.tx_dropped++;
2324 dev_kfree_skb(skb);
2325 return;
2326
2327 tx_error:
2328 rcu_read_unlock();
2329 if (err == -ELOOP)
2330 dev->stats.collisions++;
2331 else if (err == -ENETUNREACH)
2332 dev->stats.tx_carrier_errors++;
2333 dst_release(ndst);
2334 dev->stats.tx_errors++;
2335 kfree_skb(skb);
2336 }
2337
2338 /* Transmit local packets over Vxlan
2339 *
2340 * Outer IP header inherits ECN and DF from inner header.
2341 * Outer UDP destination is the VXLAN assigned port.
2342 * source port is based on hash of flow
2343 */
2344 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2345 {
2346 struct vxlan_dev *vxlan = netdev_priv(dev);
2347 struct vxlan_rdst *rdst, *fdst = NULL;
2348 const struct ip_tunnel_info *info;
2349 bool did_rsc = false;
2350 struct vxlan_fdb *f;
2351 struct ethhdr *eth;
2352 __be32 vni = 0;
2353
2354 info = skb_tunnel_info(skb);
2355
2356 skb_reset_mac_header(skb);
2357
2358 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2359 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2360 info->mode & IP_TUNNEL_INFO_TX) {
2361 vni = tunnel_id_to_key32(info->key.tun_id);
2362 } else {
2363 if (info && info->mode & IP_TUNNEL_INFO_TX)
2364 vxlan_xmit_one(skb, dev, vni, NULL, false);
2365 else
2366 kfree_skb(skb);
2367 return NETDEV_TX_OK;
2368 }
2369 }
2370
2371 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2372 eth = eth_hdr(skb);
2373 if (ntohs(eth->h_proto) == ETH_P_ARP)
2374 return arp_reduce(dev, skb, vni);
2375 #if IS_ENABLED(CONFIG_IPV6)
2376 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2377 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2378 sizeof(struct nd_msg)) &&
2379 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2380 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2381
2382 if (m->icmph.icmp6_code == 0 &&
2383 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2384 return neigh_reduce(dev, skb, vni);
2385 }
2386 #endif
2387 }
2388
2389 eth = eth_hdr(skb);
2390 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2391 did_rsc = false;
2392
2393 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2394 (ntohs(eth->h_proto) == ETH_P_IP ||
2395 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2396 did_rsc = route_shortcircuit(dev, skb);
2397 if (did_rsc)
2398 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2399 }
2400
2401 if (f == NULL) {
2402 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2403 if (f == NULL) {
2404 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2405 !is_multicast_ether_addr(eth->h_dest))
2406 vxlan_fdb_miss(vxlan, eth->h_dest);
2407
2408 dev->stats.tx_dropped++;
2409 kfree_skb(skb);
2410 return NETDEV_TX_OK;
2411 }
2412 }
2413
2414 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2415 struct sk_buff *skb1;
2416
2417 if (!fdst) {
2418 fdst = rdst;
2419 continue;
2420 }
2421 skb1 = skb_clone(skb, GFP_ATOMIC);
2422 if (skb1)
2423 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2424 }
2425
2426 if (fdst)
2427 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2428 else
2429 kfree_skb(skb);
2430 return NETDEV_TX_OK;
2431 }
2432
2433 /* Walk the forwarding table and purge stale entries */
2434 static void vxlan_cleanup(struct timer_list *t)
2435 {
2436 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2437 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2438 unsigned int h;
2439
2440 if (!netif_running(vxlan->dev))
2441 return;
2442
2443 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2444 struct hlist_node *p, *n;
2445
2446 spin_lock_bh(&vxlan->hash_lock);
2447 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2448 struct vxlan_fdb *f
2449 = container_of(p, struct vxlan_fdb, hlist);
2450 unsigned long timeout;
2451
2452 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2453 continue;
2454
2455 if (f->flags & NTF_EXT_LEARNED)
2456 continue;
2457
2458 timeout = f->used + vxlan->cfg.age_interval * HZ;
2459 if (time_before_eq(timeout, jiffies)) {
2460 netdev_dbg(vxlan->dev,
2461 "garbage collect %pM\n",
2462 f->eth_addr);
2463 f->state = NUD_STALE;
2464 vxlan_fdb_destroy(vxlan, f, true);
2465 } else if (time_before(timeout, next_timer))
2466 next_timer = timeout;
2467 }
2468 spin_unlock_bh(&vxlan->hash_lock);
2469 }
2470
2471 mod_timer(&vxlan->age_timer, next_timer);
2472 }
2473
2474 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2475 {
2476 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2477
2478 spin_lock(&vn->sock_lock);
2479 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2480 #if IS_ENABLED(CONFIG_IPV6)
2481 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2482 #endif
2483 spin_unlock(&vn->sock_lock);
2484 }
2485
2486 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2487 struct vxlan_dev_node *node)
2488 {
2489 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2490 __be32 vni = vxlan->default_dst.remote_vni;
2491
2492 node->vxlan = vxlan;
2493 spin_lock(&vn->sock_lock);
2494 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2495 spin_unlock(&vn->sock_lock);
2496 }
2497
2498 /* Setup stats when device is created */
2499 static int vxlan_init(struct net_device *dev)
2500 {
2501 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2502 if (!dev->tstats)
2503 return -ENOMEM;
2504
2505 return 0;
2506 }
2507
2508 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2509 {
2510 struct vxlan_fdb *f;
2511
2512 spin_lock_bh(&vxlan->hash_lock);
2513 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2514 if (f)
2515 vxlan_fdb_destroy(vxlan, f, true);
2516 spin_unlock_bh(&vxlan->hash_lock);
2517 }
2518
2519 static void vxlan_uninit(struct net_device *dev)
2520 {
2521 struct vxlan_dev *vxlan = netdev_priv(dev);
2522
2523 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2524
2525 free_percpu(dev->tstats);
2526 }
2527
2528 /* Start ageing timer and join group when device is brought up */
2529 static int vxlan_open(struct net_device *dev)
2530 {
2531 struct vxlan_dev *vxlan = netdev_priv(dev);
2532 int ret;
2533
2534 ret = vxlan_sock_add(vxlan);
2535 if (ret < 0)
2536 return ret;
2537
2538 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2539 ret = vxlan_igmp_join(vxlan);
2540 if (ret == -EADDRINUSE)
2541 ret = 0;
2542 if (ret) {
2543 vxlan_sock_release(vxlan);
2544 return ret;
2545 }
2546 }
2547
2548 if (vxlan->cfg.age_interval)
2549 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2550
2551 return ret;
2552 }
2553
2554 /* Purge the forwarding table */
2555 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2556 {
2557 unsigned int h;
2558
2559 spin_lock_bh(&vxlan->hash_lock);
2560 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2561 struct hlist_node *p, *n;
2562 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2563 struct vxlan_fdb *f
2564 = container_of(p, struct vxlan_fdb, hlist);
2565 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2566 continue;
2567 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2568 if (!is_zero_ether_addr(f->eth_addr))
2569 vxlan_fdb_destroy(vxlan, f, true);
2570 }
2571 }
2572 spin_unlock_bh(&vxlan->hash_lock);
2573 }
2574
2575 /* Cleanup timer and forwarding table on shutdown */
2576 static int vxlan_stop(struct net_device *dev)
2577 {
2578 struct vxlan_dev *vxlan = netdev_priv(dev);
2579 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2580 int ret = 0;
2581
2582 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2583 !vxlan_group_used(vn, vxlan))
2584 ret = vxlan_igmp_leave(vxlan);
2585
2586 del_timer_sync(&vxlan->age_timer);
2587
2588 vxlan_flush(vxlan, false);
2589 vxlan_sock_release(vxlan);
2590
2591 return ret;
2592 }
2593
2594 /* Stub, nothing needs to be done. */
2595 static void vxlan_set_multicast_list(struct net_device *dev)
2596 {
2597 }
2598
2599 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2600 {
2601 struct vxlan_dev *vxlan = netdev_priv(dev);
2602 struct vxlan_rdst *dst = &vxlan->default_dst;
2603 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2604 dst->remote_ifindex);
2605 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2606
2607 /* This check is different than dev->max_mtu, because it looks at
2608 * the lowerdev->mtu, rather than the static dev->max_mtu
2609 */
2610 if (lowerdev) {
2611 int max_mtu = lowerdev->mtu -
2612 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2613 if (new_mtu > max_mtu)
2614 return -EINVAL;
2615 }
2616
2617 dev->mtu = new_mtu;
2618 return 0;
2619 }
2620
2621 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2622 {
2623 struct vxlan_dev *vxlan = netdev_priv(dev);
2624 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2625 __be16 sport, dport;
2626
2627 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2628 vxlan->cfg.port_max, true);
2629 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2630
2631 if (ip_tunnel_info_af(info) == AF_INET) {
2632 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2633 struct rtable *rt;
2634
2635 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2636 info->key.u.ipv4.dst,
2637 &info->key.u.ipv4.src, dport, sport,
2638 &info->dst_cache, info);
2639 if (IS_ERR(rt))
2640 return PTR_ERR(rt);
2641 ip_rt_put(rt);
2642 } else {
2643 #if IS_ENABLED(CONFIG_IPV6)
2644 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2645 struct dst_entry *ndst;
2646
2647 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2648 info->key.label, &info->key.u.ipv6.dst,
2649 &info->key.u.ipv6.src, dport, sport,
2650 &info->dst_cache, info);
2651 if (IS_ERR(ndst))
2652 return PTR_ERR(ndst);
2653 dst_release(ndst);
2654 #else /* !CONFIG_IPV6 */
2655 return -EPFNOSUPPORT;
2656 #endif
2657 }
2658 info->key.tp_src = sport;
2659 info->key.tp_dst = dport;
2660 return 0;
2661 }
2662
2663 static const struct net_device_ops vxlan_netdev_ether_ops = {
2664 .ndo_init = vxlan_init,
2665 .ndo_uninit = vxlan_uninit,
2666 .ndo_open = vxlan_open,
2667 .ndo_stop = vxlan_stop,
2668 .ndo_start_xmit = vxlan_xmit,
2669 .ndo_get_stats64 = ip_tunnel_get_stats64,
2670 .ndo_set_rx_mode = vxlan_set_multicast_list,
2671 .ndo_change_mtu = vxlan_change_mtu,
2672 .ndo_validate_addr = eth_validate_addr,
2673 .ndo_set_mac_address = eth_mac_addr,
2674 .ndo_fdb_add = vxlan_fdb_add,
2675 .ndo_fdb_del = vxlan_fdb_delete,
2676 .ndo_fdb_dump = vxlan_fdb_dump,
2677 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2678 };
2679
2680 static const struct net_device_ops vxlan_netdev_raw_ops = {
2681 .ndo_init = vxlan_init,
2682 .ndo_uninit = vxlan_uninit,
2683 .ndo_open = vxlan_open,
2684 .ndo_stop = vxlan_stop,
2685 .ndo_start_xmit = vxlan_xmit,
2686 .ndo_get_stats64 = ip_tunnel_get_stats64,
2687 .ndo_change_mtu = vxlan_change_mtu,
2688 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2689 };
2690
2691 /* Info for udev, that this is a virtual tunnel endpoint */
2692 static struct device_type vxlan_type = {
2693 .name = "vxlan",
2694 };
2695
2696 /* Calls the ndo_udp_tunnel_add of the caller in order to
2697 * supply the listening VXLAN udp ports. Callers are expected
2698 * to implement the ndo_udp_tunnel_add.
2699 */
2700 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2701 {
2702 struct vxlan_sock *vs;
2703 struct net *net = dev_net(dev);
2704 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2705 unsigned int i;
2706
2707 spin_lock(&vn->sock_lock);
2708 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2709 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2710 unsigned short type;
2711
2712 if (vs->flags & VXLAN_F_GPE)
2713 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2714 else
2715 type = UDP_TUNNEL_TYPE_VXLAN;
2716
2717 if (push)
2718 udp_tunnel_push_rx_port(dev, vs->sock, type);
2719 else
2720 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2721 }
2722 }
2723 spin_unlock(&vn->sock_lock);
2724 }
2725
2726 /* Initialize the device structure. */
2727 static void vxlan_setup(struct net_device *dev)
2728 {
2729 struct vxlan_dev *vxlan = netdev_priv(dev);
2730 unsigned int h;
2731
2732 eth_hw_addr_random(dev);
2733 ether_setup(dev);
2734
2735 dev->needs_free_netdev = true;
2736 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2737
2738 dev->features |= NETIF_F_LLTX;
2739 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2740 dev->features |= NETIF_F_RXCSUM;
2741 dev->features |= NETIF_F_GSO_SOFTWARE;
2742
2743 dev->vlan_features = dev->features;
2744 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2745 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2746 netif_keep_dst(dev);
2747 dev->priv_flags |= IFF_NO_QUEUE;
2748
2749 /* MTU range: 68 - 65535 */
2750 dev->min_mtu = ETH_MIN_MTU;
2751 dev->max_mtu = ETH_MAX_MTU;
2752
2753 INIT_LIST_HEAD(&vxlan->next);
2754 spin_lock_init(&vxlan->hash_lock);
2755
2756 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2757
2758 vxlan->dev = dev;
2759
2760 gro_cells_init(&vxlan->gro_cells, dev);
2761
2762 for (h = 0; h < FDB_HASH_SIZE; ++h)
2763 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2764 }
2765
2766 static void vxlan_ether_setup(struct net_device *dev)
2767 {
2768 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2769 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2770 dev->netdev_ops = &vxlan_netdev_ether_ops;
2771 }
2772
2773 static void vxlan_raw_setup(struct net_device *dev)
2774 {
2775 dev->header_ops = NULL;
2776 dev->type = ARPHRD_NONE;
2777 dev->hard_header_len = 0;
2778 dev->addr_len = 0;
2779 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2780 dev->netdev_ops = &vxlan_netdev_raw_ops;
2781 }
2782
2783 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2784 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2785 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2786 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2787 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2788 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2789 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2790 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2791 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2792 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2793 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2794 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2795 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2796 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2797 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2798 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2799 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2800 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2801 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2802 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2803 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2804 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2805 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2806 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2807 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2808 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2809 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2810 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2811 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
2812 };
2813
2814 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2815 struct netlink_ext_ack *extack)
2816 {
2817 if (tb[IFLA_ADDRESS]) {
2818 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2819 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2820 "Provided link layer address is not Ethernet");
2821 return -EINVAL;
2822 }
2823
2824 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2825 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2826 "Provided Ethernet address is not unicast");
2827 return -EADDRNOTAVAIL;
2828 }
2829 }
2830
2831 if (tb[IFLA_MTU]) {
2832 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2833
2834 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2835 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2836 "MTU must be between 68 and 65535");
2837 return -EINVAL;
2838 }
2839 }
2840
2841 if (!data) {
2842 NL_SET_ERR_MSG(extack,
2843 "Required attributes not provided to perform the operation");
2844 return -EINVAL;
2845 }
2846
2847 if (data[IFLA_VXLAN_ID]) {
2848 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2849
2850 if (id >= VXLAN_N_VID) {
2851 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2852 "VXLAN ID must be lower than 16777216");
2853 return -ERANGE;
2854 }
2855 }
2856
2857 if (data[IFLA_VXLAN_PORT_RANGE]) {
2858 const struct ifla_vxlan_port_range *p
2859 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2860
2861 if (ntohs(p->high) < ntohs(p->low)) {
2862 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2863 "Invalid source port range");
2864 return -EINVAL;
2865 }
2866 }
2867
2868 return 0;
2869 }
2870
2871 static void vxlan_get_drvinfo(struct net_device *netdev,
2872 struct ethtool_drvinfo *drvinfo)
2873 {
2874 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2875 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2876 }
2877
2878 static const struct ethtool_ops vxlan_ethtool_ops = {
2879 .get_drvinfo = vxlan_get_drvinfo,
2880 .get_link = ethtool_op_get_link,
2881 };
2882
2883 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2884 __be16 port, u32 flags)
2885 {
2886 struct socket *sock;
2887 struct udp_port_cfg udp_conf;
2888 int err;
2889
2890 memset(&udp_conf, 0, sizeof(udp_conf));
2891
2892 if (ipv6) {
2893 udp_conf.family = AF_INET6;
2894 udp_conf.use_udp6_rx_checksums =
2895 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2896 udp_conf.ipv6_v6only = 1;
2897 } else {
2898 udp_conf.family = AF_INET;
2899 }
2900
2901 udp_conf.local_udp_port = port;
2902
2903 /* Open UDP socket */
2904 err = udp_sock_create(net, &udp_conf, &sock);
2905 if (err < 0)
2906 return ERR_PTR(err);
2907
2908 return sock;
2909 }
2910
2911 /* Create new listen socket if needed */
2912 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2913 __be16 port, u32 flags)
2914 {
2915 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2916 struct vxlan_sock *vs;
2917 struct socket *sock;
2918 unsigned int h;
2919 struct udp_tunnel_sock_cfg tunnel_cfg;
2920
2921 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2922 if (!vs)
2923 return ERR_PTR(-ENOMEM);
2924
2925 for (h = 0; h < VNI_HASH_SIZE; ++h)
2926 INIT_HLIST_HEAD(&vs->vni_list[h]);
2927
2928 sock = vxlan_create_sock(net, ipv6, port, flags);
2929 if (IS_ERR(sock)) {
2930 kfree(vs);
2931 return ERR_CAST(sock);
2932 }
2933
2934 vs->sock = sock;
2935 refcount_set(&vs->refcnt, 1);
2936 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2937
2938 spin_lock(&vn->sock_lock);
2939 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2940 udp_tunnel_notify_add_rx_port(sock,
2941 (vs->flags & VXLAN_F_GPE) ?
2942 UDP_TUNNEL_TYPE_VXLAN_GPE :
2943 UDP_TUNNEL_TYPE_VXLAN);
2944 spin_unlock(&vn->sock_lock);
2945
2946 /* Mark socket as an encapsulation socket. */
2947 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2948 tunnel_cfg.sk_user_data = vs;
2949 tunnel_cfg.encap_type = 1;
2950 tunnel_cfg.encap_rcv = vxlan_rcv;
2951 tunnel_cfg.encap_destroy = NULL;
2952 tunnel_cfg.gro_receive = vxlan_gro_receive;
2953 tunnel_cfg.gro_complete = vxlan_gro_complete;
2954
2955 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2956
2957 return vs;
2958 }
2959
2960 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2961 {
2962 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2963 struct vxlan_sock *vs = NULL;
2964 struct vxlan_dev_node *node;
2965
2966 if (!vxlan->cfg.no_share) {
2967 spin_lock(&vn->sock_lock);
2968 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2969 vxlan->cfg.dst_port, vxlan->cfg.flags);
2970 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2971 spin_unlock(&vn->sock_lock);
2972 return -EBUSY;
2973 }
2974 spin_unlock(&vn->sock_lock);
2975 }
2976 if (!vs)
2977 vs = vxlan_socket_create(vxlan->net, ipv6,
2978 vxlan->cfg.dst_port, vxlan->cfg.flags);
2979 if (IS_ERR(vs))
2980 return PTR_ERR(vs);
2981 #if IS_ENABLED(CONFIG_IPV6)
2982 if (ipv6) {
2983 rcu_assign_pointer(vxlan->vn6_sock, vs);
2984 node = &vxlan->hlist6;
2985 } else
2986 #endif
2987 {
2988 rcu_assign_pointer(vxlan->vn4_sock, vs);
2989 node = &vxlan->hlist4;
2990 }
2991 vxlan_vs_add_dev(vs, vxlan, node);
2992 return 0;
2993 }
2994
2995 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2996 {
2997 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2998 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2999 bool ipv4 = !ipv6 || metadata;
3000 int ret = 0;
3001
3002 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3003 #if IS_ENABLED(CONFIG_IPV6)
3004 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3005 if (ipv6) {
3006 ret = __vxlan_sock_add(vxlan, true);
3007 if (ret < 0 && ret != -EAFNOSUPPORT)
3008 ipv4 = false;
3009 }
3010 #endif
3011 if (ipv4)
3012 ret = __vxlan_sock_add(vxlan, false);
3013 if (ret < 0)
3014 vxlan_sock_release(vxlan);
3015 return ret;
3016 }
3017
3018 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3019 struct net_device **lower,
3020 struct vxlan_dev *old,
3021 struct netlink_ext_ack *extack)
3022 {
3023 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3024 struct vxlan_dev *tmp;
3025 bool use_ipv6 = false;
3026
3027 if (conf->flags & VXLAN_F_GPE) {
3028 /* For now, allow GPE only together with
3029 * COLLECT_METADATA. This can be relaxed later; in such
3030 * case, the other side of the PtP link will have to be
3031 * provided.
3032 */
3033 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3034 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3035 NL_SET_ERR_MSG(extack,
3036 "VXLAN GPE does not support this combination of attributes");
3037 return -EINVAL;
3038 }
3039 }
3040
3041 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3042 /* Unless IPv6 is explicitly requested, assume IPv4 */
3043 conf->remote_ip.sa.sa_family = AF_INET;
3044 conf->saddr.sa.sa_family = AF_INET;
3045 } else if (!conf->remote_ip.sa.sa_family) {
3046 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3047 } else if (!conf->saddr.sa.sa_family) {
3048 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3049 }
3050
3051 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3052 NL_SET_ERR_MSG(extack,
3053 "Local and remote address must be from the same family");
3054 return -EINVAL;
3055 }
3056
3057 if (vxlan_addr_multicast(&conf->saddr)) {
3058 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3059 return -EINVAL;
3060 }
3061
3062 if (conf->saddr.sa.sa_family == AF_INET6) {
3063 if (!IS_ENABLED(CONFIG_IPV6)) {
3064 NL_SET_ERR_MSG(extack,
3065 "IPv6 support not enabled in the kernel");
3066 return -EPFNOSUPPORT;
3067 }
3068 use_ipv6 = true;
3069 conf->flags |= VXLAN_F_IPV6;
3070
3071 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3072 int local_type =
3073 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3074 int remote_type =
3075 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3076
3077 if (local_type & IPV6_ADDR_LINKLOCAL) {
3078 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3079 (remote_type != IPV6_ADDR_ANY)) {
3080 NL_SET_ERR_MSG(extack,
3081 "Invalid combination of local and remote address scopes");
3082 return -EINVAL;
3083 }
3084
3085 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3086 } else {
3087 if (remote_type ==
3088 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3089 NL_SET_ERR_MSG(extack,
3090 "Invalid combination of local and remote address scopes");
3091 return -EINVAL;
3092 }
3093
3094 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3095 }
3096 }
3097 }
3098
3099 if (conf->label && !use_ipv6) {
3100 NL_SET_ERR_MSG(extack,
3101 "Label attribute only applies to IPv6 VXLAN devices");
3102 return -EINVAL;
3103 }
3104
3105 if (conf->remote_ifindex) {
3106 struct net_device *lowerdev;
3107
3108 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3109 if (!lowerdev) {
3110 NL_SET_ERR_MSG(extack,
3111 "Invalid local interface, device not found");
3112 return -ENODEV;
3113 }
3114
3115 #if IS_ENABLED(CONFIG_IPV6)
3116 if (use_ipv6) {
3117 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3118 if (idev && idev->cnf.disable_ipv6) {
3119 NL_SET_ERR_MSG(extack,
3120 "IPv6 support disabled by administrator");
3121 return -EPERM;
3122 }
3123 }
3124 #endif
3125
3126 *lower = lowerdev;
3127 } else {
3128 if (vxlan_addr_multicast(&conf->remote_ip)) {
3129 NL_SET_ERR_MSG(extack,
3130 "Local interface required for multicast remote destination");
3131
3132 return -EINVAL;
3133 }
3134
3135 #if IS_ENABLED(CONFIG_IPV6)
3136 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3137 NL_SET_ERR_MSG(extack,
3138 "Local interface required for link-local local/remote addresses");
3139 return -EINVAL;
3140 }
3141 #endif
3142
3143 *lower = NULL;
3144 }
3145
3146 if (!conf->dst_port) {
3147 if (conf->flags & VXLAN_F_GPE)
3148 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3149 else
3150 conf->dst_port = htons(vxlan_port);
3151 }
3152
3153 if (!conf->age_interval)
3154 conf->age_interval = FDB_AGE_DEFAULT;
3155
3156 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3157 if (tmp == old)
3158 continue;
3159
3160 if (tmp->cfg.vni != conf->vni)
3161 continue;
3162 if (tmp->cfg.dst_port != conf->dst_port)
3163 continue;
3164 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3165 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3166 continue;
3167
3168 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3169 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3170 continue;
3171
3172 NL_SET_ERR_MSG(extack,
3173 "A VXLAN device with the specified VNI already exists");
3174 return -EEXIST;
3175 }
3176
3177 return 0;
3178 }
3179
3180 static void vxlan_config_apply(struct net_device *dev,
3181 struct vxlan_config *conf,
3182 struct net_device *lowerdev,
3183 struct net *src_net,
3184 bool changelink)
3185 {
3186 struct vxlan_dev *vxlan = netdev_priv(dev);
3187 struct vxlan_rdst *dst = &vxlan->default_dst;
3188 unsigned short needed_headroom = ETH_HLEN;
3189 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3190 int max_mtu = ETH_MAX_MTU;
3191
3192 if (!changelink) {
3193 if (conf->flags & VXLAN_F_GPE)
3194 vxlan_raw_setup(dev);
3195 else
3196 vxlan_ether_setup(dev);
3197
3198 if (conf->mtu)
3199 dev->mtu = conf->mtu;
3200
3201 vxlan->net = src_net;
3202 }
3203
3204 dst->remote_vni = conf->vni;
3205
3206 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3207
3208 if (lowerdev) {
3209 dst->remote_ifindex = conf->remote_ifindex;
3210
3211 dev->gso_max_size = lowerdev->gso_max_size;
3212 dev->gso_max_segs = lowerdev->gso_max_segs;
3213
3214 needed_headroom = lowerdev->hard_header_len;
3215
3216 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3217 VXLAN_HEADROOM);
3218 if (max_mtu < ETH_MIN_MTU)
3219 max_mtu = ETH_MIN_MTU;
3220
3221 if (!changelink && !conf->mtu)
3222 dev->mtu = max_mtu;
3223 }
3224
3225 if (dev->mtu > max_mtu)
3226 dev->mtu = max_mtu;
3227
3228 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3229 needed_headroom += VXLAN6_HEADROOM;
3230 else
3231 needed_headroom += VXLAN_HEADROOM;
3232 dev->needed_headroom = needed_headroom;
3233
3234 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3235 }
3236
3237 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3238 struct vxlan_config *conf, bool changelink,
3239 struct netlink_ext_ack *extack)
3240 {
3241 struct vxlan_dev *vxlan = netdev_priv(dev);
3242 struct net_device *lowerdev;
3243 int ret;
3244
3245 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3246 if (ret)
3247 return ret;
3248
3249 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3250
3251 return 0;
3252 }
3253
3254 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3255 struct vxlan_config *conf,
3256 struct netlink_ext_ack *extack)
3257 {
3258 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3259 struct vxlan_dev *vxlan = netdev_priv(dev);
3260 struct vxlan_fdb *f = NULL;
3261 int err;
3262
3263 err = vxlan_dev_configure(net, dev, conf, false, extack);
3264 if (err)
3265 return err;
3266
3267 dev->ethtool_ops = &vxlan_ethtool_ops;
3268
3269 /* create an fdb entry for a valid default destination */
3270 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3271 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3272 &vxlan->default_dst.remote_ip,
3273 NUD_REACHABLE | NUD_PERMANENT,
3274 vxlan->cfg.dst_port,
3275 vxlan->default_dst.remote_vni,
3276 vxlan->default_dst.remote_vni,
3277 vxlan->default_dst.remote_ifindex,
3278 NTF_SELF, &f);
3279 if (err)
3280 return err;
3281 }
3282
3283 err = register_netdevice(dev);
3284 if (err)
3285 goto errout;
3286
3287 err = rtnl_configure_link(dev, NULL);
3288 if (err) {
3289 unregister_netdevice(dev);
3290 goto errout;
3291 }
3292
3293 /* notify default fdb entry */
3294 if (f)
3295 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3296
3297 list_add(&vxlan->next, &vn->vxlan_list);
3298 return 0;
3299 errout:
3300 if (f)
3301 vxlan_fdb_destroy(vxlan, f, false);
3302 return err;
3303 }
3304
3305 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3306 struct net_device *dev, struct vxlan_config *conf,
3307 bool changelink)
3308 {
3309 struct vxlan_dev *vxlan = netdev_priv(dev);
3310
3311 memset(conf, 0, sizeof(*conf));
3312
3313 /* if changelink operation, start with old existing cfg */
3314 if (changelink)
3315 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3316
3317 if (data[IFLA_VXLAN_ID]) {
3318 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3319
3320 if (changelink && (vni != conf->vni))
3321 return -EOPNOTSUPP;
3322 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3323 }
3324
3325 if (data[IFLA_VXLAN_GROUP]) {
3326 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3327 return -EOPNOTSUPP;
3328
3329 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3330 conf->remote_ip.sa.sa_family = AF_INET;
3331 } else if (data[IFLA_VXLAN_GROUP6]) {
3332 if (!IS_ENABLED(CONFIG_IPV6))
3333 return -EPFNOSUPPORT;
3334
3335 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3336 return -EOPNOTSUPP;
3337
3338 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3339 conf->remote_ip.sa.sa_family = AF_INET6;
3340 }
3341
3342 if (data[IFLA_VXLAN_LOCAL]) {
3343 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3344 return -EOPNOTSUPP;
3345
3346 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3347 conf->saddr.sa.sa_family = AF_INET;
3348 } else if (data[IFLA_VXLAN_LOCAL6]) {
3349 if (!IS_ENABLED(CONFIG_IPV6))
3350 return -EPFNOSUPPORT;
3351
3352 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3353 return -EOPNOTSUPP;
3354
3355 /* TODO: respect scope id */
3356 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3357 conf->saddr.sa.sa_family = AF_INET6;
3358 }
3359
3360 if (data[IFLA_VXLAN_LINK])
3361 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3362
3363 if (data[IFLA_VXLAN_TOS])
3364 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3365
3366 if (data[IFLA_VXLAN_TTL])
3367 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3368
3369 if (data[IFLA_VXLAN_TTL_INHERIT]) {
3370 if (changelink)
3371 return -EOPNOTSUPP;
3372 conf->flags |= VXLAN_F_TTL_INHERIT;
3373 }
3374
3375 if (data[IFLA_VXLAN_LABEL])
3376 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3377 IPV6_FLOWLABEL_MASK;
3378
3379 if (data[IFLA_VXLAN_LEARNING]) {
3380 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3381 conf->flags |= VXLAN_F_LEARN;
3382 else
3383 conf->flags &= ~VXLAN_F_LEARN;
3384 } else if (!changelink) {
3385 /* default to learn on a new device */
3386 conf->flags |= VXLAN_F_LEARN;
3387 }
3388
3389 if (data[IFLA_VXLAN_AGEING]) {
3390 if (changelink)
3391 return -EOPNOTSUPP;
3392 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3393 }
3394
3395 if (data[IFLA_VXLAN_PROXY]) {
3396 if (changelink)
3397 return -EOPNOTSUPP;
3398 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3399 conf->flags |= VXLAN_F_PROXY;
3400 }
3401
3402 if (data[IFLA_VXLAN_RSC]) {
3403 if (changelink)
3404 return -EOPNOTSUPP;
3405 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3406 conf->flags |= VXLAN_F_RSC;
3407 }
3408
3409 if (data[IFLA_VXLAN_L2MISS]) {
3410 if (changelink)
3411 return -EOPNOTSUPP;
3412 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3413 conf->flags |= VXLAN_F_L2MISS;
3414 }
3415
3416 if (data[IFLA_VXLAN_L3MISS]) {
3417 if (changelink)
3418 return -EOPNOTSUPP;
3419 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3420 conf->flags |= VXLAN_F_L3MISS;
3421 }
3422
3423 if (data[IFLA_VXLAN_LIMIT]) {
3424 if (changelink)
3425 return -EOPNOTSUPP;
3426 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3427 }
3428
3429 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3430 if (changelink)
3431 return -EOPNOTSUPP;
3432 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3433 conf->flags |= VXLAN_F_COLLECT_METADATA;
3434 }
3435
3436 if (data[IFLA_VXLAN_PORT_RANGE]) {
3437 if (!changelink) {
3438 const struct ifla_vxlan_port_range *p
3439 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3440 conf->port_min = ntohs(p->low);
3441 conf->port_max = ntohs(p->high);
3442 } else {
3443 return -EOPNOTSUPP;
3444 }
3445 }
3446
3447 if (data[IFLA_VXLAN_PORT]) {
3448 if (changelink)
3449 return -EOPNOTSUPP;
3450 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3451 }
3452
3453 if (data[IFLA_VXLAN_UDP_CSUM]) {
3454 if (changelink)
3455 return -EOPNOTSUPP;
3456 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3457 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3458 }
3459
3460 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3461 if (changelink)
3462 return -EOPNOTSUPP;
3463 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3464 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3465 }
3466
3467 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3468 if (changelink)
3469 return -EOPNOTSUPP;
3470 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3471 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3472 }
3473
3474 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3475 if (changelink)
3476 return -EOPNOTSUPP;
3477 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3478 conf->flags |= VXLAN_F_REMCSUM_TX;
3479 }
3480
3481 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3482 if (changelink)
3483 return -EOPNOTSUPP;
3484 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3485 conf->flags |= VXLAN_F_REMCSUM_RX;
3486 }
3487
3488 if (data[IFLA_VXLAN_GBP]) {
3489 if (changelink)
3490 return -EOPNOTSUPP;
3491 conf->flags |= VXLAN_F_GBP;
3492 }
3493
3494 if (data[IFLA_VXLAN_GPE]) {
3495 if (changelink)
3496 return -EOPNOTSUPP;
3497 conf->flags |= VXLAN_F_GPE;
3498 }
3499
3500 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3501 if (changelink)
3502 return -EOPNOTSUPP;
3503 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3504 }
3505
3506 if (tb[IFLA_MTU]) {
3507 if (changelink)
3508 return -EOPNOTSUPP;
3509 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3510 }
3511
3512 return 0;
3513 }
3514
3515 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3516 struct nlattr *tb[], struct nlattr *data[],
3517 struct netlink_ext_ack *extack)
3518 {
3519 struct vxlan_config conf;
3520 int err;
3521
3522 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3523 if (err)
3524 return err;
3525
3526 return __vxlan_dev_create(src_net, dev, &conf, extack);
3527 }
3528
3529 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3530 struct nlattr *data[],
3531 struct netlink_ext_ack *extack)
3532 {
3533 struct vxlan_dev *vxlan = netdev_priv(dev);
3534 struct vxlan_rdst *dst = &vxlan->default_dst;
3535 struct vxlan_rdst old_dst;
3536 struct vxlan_config conf;
3537 struct vxlan_fdb *f = NULL;
3538 int err;
3539
3540 err = vxlan_nl2conf(tb, data,
3541 dev, &conf, true);
3542 if (err)
3543 return err;
3544
3545 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3546
3547 err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3548 if (err)
3549 return err;
3550
3551 /* handle default dst entry */
3552 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3553 spin_lock_bh(&vxlan->hash_lock);
3554 if (!vxlan_addr_any(&old_dst.remote_ip))
3555 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3556 old_dst.remote_ip,
3557 vxlan->cfg.dst_port,
3558 old_dst.remote_vni,
3559 old_dst.remote_vni,
3560 old_dst.remote_ifindex, 0);
3561
3562 if (!vxlan_addr_any(&dst->remote_ip)) {
3563 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3564 &dst->remote_ip,
3565 NUD_REACHABLE | NUD_PERMANENT,
3566 vxlan->cfg.dst_port,
3567 dst->remote_vni,
3568 dst->remote_vni,
3569 dst->remote_ifindex,
3570 NTF_SELF, &f);
3571 if (err) {
3572 spin_unlock_bh(&vxlan->hash_lock);
3573 return err;
3574 }
3575 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3576 }
3577 spin_unlock_bh(&vxlan->hash_lock);
3578 }
3579
3580 return 0;
3581 }
3582
3583 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3584 {
3585 struct vxlan_dev *vxlan = netdev_priv(dev);
3586
3587 vxlan_flush(vxlan, true);
3588
3589 gro_cells_destroy(&vxlan->gro_cells);
3590 list_del(&vxlan->next);
3591 unregister_netdevice_queue(dev, head);
3592 }
3593
3594 static size_t vxlan_get_size(const struct net_device *dev)
3595 {
3596
3597 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3598 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3599 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3600 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3601 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3602 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
3603 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3604 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3605 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3606 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3607 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3608 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3609 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3610 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3611 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3612 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3613 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3614 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3615 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3616 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3617 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3618 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3619 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3620 0;
3621 }
3622
3623 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3624 {
3625 const struct vxlan_dev *vxlan = netdev_priv(dev);
3626 const struct vxlan_rdst *dst = &vxlan->default_dst;
3627 struct ifla_vxlan_port_range ports = {
3628 .low = htons(vxlan->cfg.port_min),
3629 .high = htons(vxlan->cfg.port_max),
3630 };
3631
3632 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3633 goto nla_put_failure;
3634
3635 if (!vxlan_addr_any(&dst->remote_ip)) {
3636 if (dst->remote_ip.sa.sa_family == AF_INET) {
3637 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3638 dst->remote_ip.sin.sin_addr.s_addr))
3639 goto nla_put_failure;
3640 #if IS_ENABLED(CONFIG_IPV6)
3641 } else {
3642 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3643 &dst->remote_ip.sin6.sin6_addr))
3644 goto nla_put_failure;
3645 #endif
3646 }
3647 }
3648
3649 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3650 goto nla_put_failure;
3651
3652 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3653 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3654 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3655 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3656 goto nla_put_failure;
3657 #if IS_ENABLED(CONFIG_IPV6)
3658 } else {
3659 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3660 &vxlan->cfg.saddr.sin6.sin6_addr))
3661 goto nla_put_failure;
3662 #endif
3663 }
3664 }
3665
3666 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3667 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
3668 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
3669 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3670 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3671 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3672 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3673 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3674 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3675 nla_put_u8(skb, IFLA_VXLAN_RSC,
3676 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3677 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3678 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3679 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3680 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3681 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3682 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3683 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3684 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3685 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3686 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3687 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3688 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3689 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3690 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3691 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3692 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3693 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3694 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3695 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3696 goto nla_put_failure;
3697
3698 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3699 goto nla_put_failure;
3700
3701 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3702 nla_put_flag(skb, IFLA_VXLAN_GBP))
3703 goto nla_put_failure;
3704
3705 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3706 nla_put_flag(skb, IFLA_VXLAN_GPE))
3707 goto nla_put_failure;
3708
3709 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3710 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3711 goto nla_put_failure;
3712
3713 return 0;
3714
3715 nla_put_failure:
3716 return -EMSGSIZE;
3717 }
3718
3719 static struct net *vxlan_get_link_net(const struct net_device *dev)
3720 {
3721 struct vxlan_dev *vxlan = netdev_priv(dev);
3722
3723 return vxlan->net;
3724 }
3725
3726 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3727 .kind = "vxlan",
3728 .maxtype = IFLA_VXLAN_MAX,
3729 .policy = vxlan_policy,
3730 .priv_size = sizeof(struct vxlan_dev),
3731 .setup = vxlan_setup,
3732 .validate = vxlan_validate,
3733 .newlink = vxlan_newlink,
3734 .changelink = vxlan_changelink,
3735 .dellink = vxlan_dellink,
3736 .get_size = vxlan_get_size,
3737 .fill_info = vxlan_fill_info,
3738 .get_link_net = vxlan_get_link_net,
3739 };
3740
3741 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3742 u8 name_assign_type,
3743 struct vxlan_config *conf)
3744 {
3745 struct nlattr *tb[IFLA_MAX + 1];
3746 struct net_device *dev;
3747 int err;
3748
3749 memset(&tb, 0, sizeof(tb));
3750
3751 dev = rtnl_create_link(net, name, name_assign_type,
3752 &vxlan_link_ops, tb);
3753 if (IS_ERR(dev))
3754 return dev;
3755
3756 err = __vxlan_dev_create(net, dev, conf, NULL);
3757 if (err < 0) {
3758 free_netdev(dev);
3759 return ERR_PTR(err);
3760 }
3761
3762 err = rtnl_configure_link(dev, NULL);
3763 if (err < 0) {
3764 LIST_HEAD(list_kill);
3765
3766 vxlan_dellink(dev, &list_kill);
3767 unregister_netdevice_many(&list_kill);
3768 return ERR_PTR(err);
3769 }
3770
3771 return dev;
3772 }
3773 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3774
3775 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3776 struct net_device *dev)
3777 {
3778 struct vxlan_dev *vxlan, *next;
3779 LIST_HEAD(list_kill);
3780
3781 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3782 struct vxlan_rdst *dst = &vxlan->default_dst;
3783
3784 /* In case we created vxlan device with carrier
3785 * and we loose the carrier due to module unload
3786 * we also need to remove vxlan device. In other
3787 * cases, it's not necessary and remote_ifindex
3788 * is 0 here, so no matches.
3789 */
3790 if (dst->remote_ifindex == dev->ifindex)
3791 vxlan_dellink(vxlan->dev, &list_kill);
3792 }
3793
3794 unregister_netdevice_many(&list_kill);
3795 }
3796
3797 static int vxlan_netdevice_event(struct notifier_block *unused,
3798 unsigned long event, void *ptr)
3799 {
3800 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3801 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3802
3803 if (event == NETDEV_UNREGISTER) {
3804 vxlan_offload_rx_ports(dev, false);
3805 vxlan_handle_lowerdev_unregister(vn, dev);
3806 } else if (event == NETDEV_REGISTER) {
3807 vxlan_offload_rx_ports(dev, true);
3808 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3809 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3810 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3811 }
3812
3813 return NOTIFY_DONE;
3814 }
3815
3816 static struct notifier_block vxlan_notifier_block __read_mostly = {
3817 .notifier_call = vxlan_netdevice_event,
3818 };
3819
3820 static void
3821 vxlan_fdb_offloaded_set(struct net_device *dev,
3822 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
3823 {
3824 struct vxlan_dev *vxlan = netdev_priv(dev);
3825 struct vxlan_rdst *rdst;
3826 struct vxlan_fdb *f;
3827
3828 spin_lock_bh(&vxlan->hash_lock);
3829
3830 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
3831 if (!f)
3832 goto out;
3833
3834 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
3835 fdb_info->remote_port,
3836 fdb_info->remote_vni,
3837 fdb_info->remote_ifindex);
3838 if (!rdst)
3839 goto out;
3840
3841 rdst->offloaded = fdb_info->offloaded;
3842
3843 out:
3844 spin_unlock_bh(&vxlan->hash_lock);
3845 }
3846
3847 static int vxlan_switchdev_event(struct notifier_block *unused,
3848 unsigned long event, void *ptr)
3849 {
3850 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
3851
3852 switch (event) {
3853 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
3854 vxlan_fdb_offloaded_set(dev, ptr);
3855 break;
3856 }
3857
3858 return 0;
3859 }
3860
3861 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
3862 .notifier_call = vxlan_switchdev_event,
3863 };
3864
3865 static __net_init int vxlan_init_net(struct net *net)
3866 {
3867 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3868 unsigned int h;
3869
3870 INIT_LIST_HEAD(&vn->vxlan_list);
3871 spin_lock_init(&vn->sock_lock);
3872
3873 for (h = 0; h < PORT_HASH_SIZE; ++h)
3874 INIT_HLIST_HEAD(&vn->sock_list[h]);
3875
3876 return 0;
3877 }
3878
3879 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
3880 {
3881 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3882 struct vxlan_dev *vxlan, *next;
3883 struct net_device *dev, *aux;
3884 unsigned int h;
3885
3886 for_each_netdev_safe(net, dev, aux)
3887 if (dev->rtnl_link_ops == &vxlan_link_ops)
3888 unregister_netdevice_queue(dev, head);
3889
3890 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3891 /* If vxlan->dev is in the same netns, it has already been added
3892 * to the list by the previous loop.
3893 */
3894 if (!net_eq(dev_net(vxlan->dev), net)) {
3895 gro_cells_destroy(&vxlan->gro_cells);
3896 unregister_netdevice_queue(vxlan->dev, head);
3897 }
3898 }
3899
3900 for (h = 0; h < PORT_HASH_SIZE; ++h)
3901 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
3902 }
3903
3904 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
3905 {
3906 struct net *net;
3907 LIST_HEAD(list);
3908
3909 rtnl_lock();
3910 list_for_each_entry(net, net_list, exit_list)
3911 vxlan_destroy_tunnels(net, &list);
3912
3913 unregister_netdevice_many(&list);
3914 rtnl_unlock();
3915 }
3916
3917 static struct pernet_operations vxlan_net_ops = {
3918 .init = vxlan_init_net,
3919 .exit_batch = vxlan_exit_batch_net,
3920 .id = &vxlan_net_id,
3921 .size = sizeof(struct vxlan_net),
3922 };
3923
3924 static int __init vxlan_init_module(void)
3925 {
3926 int rc;
3927
3928 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3929
3930 rc = register_pernet_subsys(&vxlan_net_ops);
3931 if (rc)
3932 goto out1;
3933
3934 rc = register_netdevice_notifier(&vxlan_notifier_block);
3935 if (rc)
3936 goto out2;
3937
3938 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
3939 if (rc)
3940 goto out3;
3941
3942 rc = rtnl_link_register(&vxlan_link_ops);
3943 if (rc)
3944 goto out4;
3945
3946 return 0;
3947 out4:
3948 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
3949 out3:
3950 unregister_netdevice_notifier(&vxlan_notifier_block);
3951 out2:
3952 unregister_pernet_subsys(&vxlan_net_ops);
3953 out1:
3954 return rc;
3955 }
3956 late_initcall(vxlan_init_module);
3957
3958 static void __exit vxlan_cleanup_module(void)
3959 {
3960 rtnl_link_unregister(&vxlan_link_ops);
3961 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
3962 unregister_netdevice_notifier(&vxlan_notifier_block);
3963 unregister_pernet_subsys(&vxlan_net_ops);
3964 /* rcu_barrier() is called by netns */
3965 }
3966 module_exit(vxlan_cleanup_module);
3967
3968 MODULE_LICENSE("GPL");
3969 MODULE_VERSION(VXLAN_VERSION);
3970 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3971 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3972 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support