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Fix race condition between vxlan_sock_add and vxlan_sock_release
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
47 #include <net/ipv6.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
51 #endif
52
53 #define VXLAN_VERSION "0.1"
54
55 #define PORT_HASH_BITS 8
56 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
57 #define VNI_HASH_BITS 10
58 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59 #define FDB_HASH_BITS 8
60 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61 #define FDB_AGE_DEFAULT 300 /* 5 min */
62 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
63
64 #define VXLAN_N_VID (1u << 24)
65 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
66 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
67
68 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
69
70 /* UDP port for VXLAN traffic.
71 * The IANA assigned port is 4789, but the Linux default is 8472
72 * for compatibility with early adopters.
73 */
74 static unsigned short vxlan_port __read_mostly = 8472;
75 module_param_named(udp_port, vxlan_port, ushort, 0444);
76 MODULE_PARM_DESC(udp_port, "Destination UDP port");
77
78 static bool log_ecn_error = true;
79 module_param(log_ecn_error, bool, 0644);
80 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
81
82 static int vxlan_net_id;
83
84 static const u8 all_zeros_mac[ETH_ALEN];
85
86 /* per-network namespace private data for this module */
87 struct vxlan_net {
88 struct list_head vxlan_list;
89 struct hlist_head sock_list[PORT_HASH_SIZE];
90 spinlock_t sock_lock;
91 };
92
93 union vxlan_addr {
94 struct sockaddr_in sin;
95 struct sockaddr_in6 sin6;
96 struct sockaddr sa;
97 };
98
99 struct vxlan_rdst {
100 union vxlan_addr remote_ip;
101 __be16 remote_port;
102 u32 remote_vni;
103 u32 remote_ifindex;
104 struct list_head list;
105 struct rcu_head rcu;
106 };
107
108 /* Forwarding table entry */
109 struct vxlan_fdb {
110 struct hlist_node hlist; /* linked list of entries */
111 struct rcu_head rcu;
112 unsigned long updated; /* jiffies */
113 unsigned long used;
114 struct list_head remotes;
115 u16 state; /* see ndm_state */
116 u8 flags; /* see ndm_flags */
117 u8 eth_addr[ETH_ALEN];
118 };
119
120 /* Pseudo network device */
121 struct vxlan_dev {
122 struct hlist_node hlist; /* vni hash table */
123 struct list_head next; /* vxlan's per namespace list */
124 struct vxlan_sock *vn_sock; /* listening socket */
125 struct net_device *dev;
126 struct net *net; /* netns for packet i/o */
127 struct vxlan_rdst default_dst; /* default destination */
128 union vxlan_addr saddr; /* source address */
129 __be16 dst_port;
130 __u16 port_min; /* source port range */
131 __u16 port_max;
132 __u8 tos; /* TOS override */
133 __u8 ttl;
134 u32 flags; /* VXLAN_F_* in vxlan.h */
135
136 struct work_struct sock_work;
137 struct work_struct igmp_join;
138 struct work_struct igmp_leave;
139
140 unsigned long age_interval;
141 struct timer_list age_timer;
142 spinlock_t hash_lock;
143 unsigned int addrcnt;
144 unsigned int addrmax;
145
146 struct hlist_head fdb_head[FDB_HASH_SIZE];
147 };
148
149 /* salt for hash table */
150 static u32 vxlan_salt __read_mostly;
151 static struct workqueue_struct *vxlan_wq;
152
153 static void vxlan_sock_work(struct work_struct *work);
154
155 #if IS_ENABLED(CONFIG_IPV6)
156 static inline
157 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
158 {
159 if (a->sa.sa_family != b->sa.sa_family)
160 return false;
161 if (a->sa.sa_family == AF_INET6)
162 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
163 else
164 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
165 }
166
167 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
168 {
169 if (ipa->sa.sa_family == AF_INET6)
170 return ipv6_addr_any(&ipa->sin6.sin6_addr);
171 else
172 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
173 }
174
175 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
176 {
177 if (ipa->sa.sa_family == AF_INET6)
178 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
179 else
180 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
181 }
182
183 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
184 {
185 if (nla_len(nla) >= sizeof(struct in6_addr)) {
186 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
187 ip->sa.sa_family = AF_INET6;
188 return 0;
189 } else if (nla_len(nla) >= sizeof(__be32)) {
190 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
191 ip->sa.sa_family = AF_INET;
192 return 0;
193 } else {
194 return -EAFNOSUPPORT;
195 }
196 }
197
198 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
199 const union vxlan_addr *ip)
200 {
201 if (ip->sa.sa_family == AF_INET6)
202 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
203 else
204 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
205 }
206
207 #else /* !CONFIG_IPV6 */
208
209 static inline
210 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
211 {
212 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
213 }
214
215 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
216 {
217 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
218 }
219
220 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
221 {
222 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
223 }
224
225 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
226 {
227 if (nla_len(nla) >= sizeof(struct in6_addr)) {
228 return -EAFNOSUPPORT;
229 } else if (nla_len(nla) >= sizeof(__be32)) {
230 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
231 ip->sa.sa_family = AF_INET;
232 return 0;
233 } else {
234 return -EAFNOSUPPORT;
235 }
236 }
237
238 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
239 const union vxlan_addr *ip)
240 {
241 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
242 }
243 #endif
244
245 /* Virtual Network hash table head */
246 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
247 {
248 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
249 }
250
251 /* Socket hash table head */
252 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
253 {
254 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
255
256 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
257 }
258
259 /* First remote destination for a forwarding entry.
260 * Guaranteed to be non-NULL because remotes are never deleted.
261 */
262 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
263 {
264 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
265 }
266
267 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
268 {
269 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
270 }
271
272 /* Find VXLAN socket based on network namespace, address family and UDP port */
273 static struct vxlan_sock *vxlan_find_sock(struct net *net,
274 sa_family_t family, __be16 port)
275 {
276 struct vxlan_sock *vs;
277
278 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
279 if (inet_sk(vs->sock->sk)->inet_sport == port &&
280 inet_sk(vs->sock->sk)->sk.sk_family == family)
281 return vs;
282 }
283 return NULL;
284 }
285
286 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
287 {
288 struct vxlan_dev *vxlan;
289
290 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
291 if (vxlan->default_dst.remote_vni == id)
292 return vxlan;
293 }
294
295 return NULL;
296 }
297
298 /* Look up VNI in a per net namespace table */
299 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
300 sa_family_t family, __be16 port)
301 {
302 struct vxlan_sock *vs;
303
304 vs = vxlan_find_sock(net, family, port);
305 if (!vs)
306 return NULL;
307
308 return vxlan_vs_find_vni(vs, id);
309 }
310
311 /* Fill in neighbour message in skbuff. */
312 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
313 const struct vxlan_fdb *fdb,
314 u32 portid, u32 seq, int type, unsigned int flags,
315 const struct vxlan_rdst *rdst)
316 {
317 unsigned long now = jiffies;
318 struct nda_cacheinfo ci;
319 struct nlmsghdr *nlh;
320 struct ndmsg *ndm;
321 bool send_ip, send_eth;
322
323 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
324 if (nlh == NULL)
325 return -EMSGSIZE;
326
327 ndm = nlmsg_data(nlh);
328 memset(ndm, 0, sizeof(*ndm));
329
330 send_eth = send_ip = true;
331
332 if (type == RTM_GETNEIGH) {
333 ndm->ndm_family = AF_INET;
334 send_ip = !vxlan_addr_any(&rdst->remote_ip);
335 send_eth = !is_zero_ether_addr(fdb->eth_addr);
336 } else
337 ndm->ndm_family = AF_BRIDGE;
338 ndm->ndm_state = fdb->state;
339 ndm->ndm_ifindex = vxlan->dev->ifindex;
340 ndm->ndm_flags = fdb->flags;
341 ndm->ndm_type = RTN_UNICAST;
342
343 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
344 goto nla_put_failure;
345
346 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
347 goto nla_put_failure;
348
349 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
350 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
351 goto nla_put_failure;
352 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
353 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
354 goto nla_put_failure;
355 if (rdst->remote_ifindex &&
356 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
357 goto nla_put_failure;
358
359 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
360 ci.ndm_confirmed = 0;
361 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
362 ci.ndm_refcnt = 0;
363
364 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
365 goto nla_put_failure;
366
367 return nlmsg_end(skb, nlh);
368
369 nla_put_failure:
370 nlmsg_cancel(skb, nlh);
371 return -EMSGSIZE;
372 }
373
374 static inline size_t vxlan_nlmsg_size(void)
375 {
376 return NLMSG_ALIGN(sizeof(struct ndmsg))
377 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
378 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
379 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
380 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
381 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
382 + nla_total_size(sizeof(struct nda_cacheinfo));
383 }
384
385 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
386 struct vxlan_rdst *rd, int type)
387 {
388 struct net *net = dev_net(vxlan->dev);
389 struct sk_buff *skb;
390 int err = -ENOBUFS;
391
392 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
393 if (skb == NULL)
394 goto errout;
395
396 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
397 if (err < 0) {
398 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
399 WARN_ON(err == -EMSGSIZE);
400 kfree_skb(skb);
401 goto errout;
402 }
403
404 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
405 return;
406 errout:
407 if (err < 0)
408 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
409 }
410
411 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
412 {
413 struct vxlan_dev *vxlan = netdev_priv(dev);
414 struct vxlan_fdb f = {
415 .state = NUD_STALE,
416 };
417 struct vxlan_rdst remote = {
418 .remote_ip = *ipa, /* goes to NDA_DST */
419 .remote_vni = VXLAN_N_VID,
420 };
421
422 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
423 }
424
425 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
426 {
427 struct vxlan_fdb f = {
428 .state = NUD_STALE,
429 };
430 struct vxlan_rdst remote = { };
431
432 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
433
434 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
435 }
436
437 /* Hash Ethernet address */
438 static u32 eth_hash(const unsigned char *addr)
439 {
440 u64 value = get_unaligned((u64 *)addr);
441
442 /* only want 6 bytes */
443 #ifdef __BIG_ENDIAN
444 value >>= 16;
445 #else
446 value <<= 16;
447 #endif
448 return hash_64(value, FDB_HASH_BITS);
449 }
450
451 /* Hash chain to use given mac address */
452 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
453 const u8 *mac)
454 {
455 return &vxlan->fdb_head[eth_hash(mac)];
456 }
457
458 /* Look up Ethernet address in forwarding table */
459 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
460 const u8 *mac)
461 {
462 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
463 struct vxlan_fdb *f;
464
465 hlist_for_each_entry_rcu(f, head, hlist) {
466 if (ether_addr_equal(mac, f->eth_addr))
467 return f;
468 }
469
470 return NULL;
471 }
472
473 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
474 const u8 *mac)
475 {
476 struct vxlan_fdb *f;
477
478 f = __vxlan_find_mac(vxlan, mac);
479 if (f)
480 f->used = jiffies;
481
482 return f;
483 }
484
485 /* caller should hold vxlan->hash_lock */
486 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
487 union vxlan_addr *ip, __be16 port,
488 __u32 vni, __u32 ifindex)
489 {
490 struct vxlan_rdst *rd;
491
492 list_for_each_entry(rd, &f->remotes, list) {
493 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
494 rd->remote_port == port &&
495 rd->remote_vni == vni &&
496 rd->remote_ifindex == ifindex)
497 return rd;
498 }
499
500 return NULL;
501 }
502
503 /* Replace destination of unicast mac */
504 static int vxlan_fdb_replace(struct vxlan_fdb *f,
505 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
506 {
507 struct vxlan_rdst *rd;
508
509 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
510 if (rd)
511 return 0;
512
513 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
514 if (!rd)
515 return 0;
516 rd->remote_ip = *ip;
517 rd->remote_port = port;
518 rd->remote_vni = vni;
519 rd->remote_ifindex = ifindex;
520 return 1;
521 }
522
523 /* Add/update destinations for multicast */
524 static int vxlan_fdb_append(struct vxlan_fdb *f,
525 union vxlan_addr *ip, __be16 port, __u32 vni,
526 __u32 ifindex, struct vxlan_rdst **rdp)
527 {
528 struct vxlan_rdst *rd;
529
530 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
531 if (rd)
532 return 0;
533
534 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
535 if (rd == NULL)
536 return -ENOBUFS;
537 rd->remote_ip = *ip;
538 rd->remote_port = port;
539 rd->remote_vni = vni;
540 rd->remote_ifindex = ifindex;
541
542 list_add_tail_rcu(&rd->list, &f->remotes);
543
544 *rdp = rd;
545 return 1;
546 }
547
548 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
549 {
550 struct sk_buff *p, **pp = NULL;
551 struct vxlanhdr *vh, *vh2;
552 struct ethhdr *eh, *eh2;
553 unsigned int hlen, off_vx, off_eth;
554 const struct packet_offload *ptype;
555 __be16 type;
556 int flush = 1;
557
558 off_vx = skb_gro_offset(skb);
559 hlen = off_vx + sizeof(*vh);
560 vh = skb_gro_header_fast(skb, off_vx);
561 if (skb_gro_header_hard(skb, hlen)) {
562 vh = skb_gro_header_slow(skb, hlen, off_vx);
563 if (unlikely(!vh))
564 goto out;
565 }
566 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
567 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
568
569 off_eth = skb_gro_offset(skb);
570 hlen = off_eth + sizeof(*eh);
571 eh = skb_gro_header_fast(skb, off_eth);
572 if (skb_gro_header_hard(skb, hlen)) {
573 eh = skb_gro_header_slow(skb, hlen, off_eth);
574 if (unlikely(!eh))
575 goto out;
576 }
577
578 flush = 0;
579
580 for (p = *head; p; p = p->next) {
581 if (!NAPI_GRO_CB(p)->same_flow)
582 continue;
583
584 vh2 = (struct vxlanhdr *)(p->data + off_vx);
585 eh2 = (struct ethhdr *)(p->data + off_eth);
586 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
587 NAPI_GRO_CB(p)->same_flow = 0;
588 continue;
589 }
590 }
591
592 type = eh->h_proto;
593
594 rcu_read_lock();
595 ptype = gro_find_receive_by_type(type);
596 if (ptype == NULL) {
597 flush = 1;
598 goto out_unlock;
599 }
600
601 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
602 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
603 pp = ptype->callbacks.gro_receive(head, skb);
604
605 out_unlock:
606 rcu_read_unlock();
607 out:
608 NAPI_GRO_CB(skb)->flush |= flush;
609
610 return pp;
611 }
612
613 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
614 {
615 struct ethhdr *eh;
616 struct packet_offload *ptype;
617 __be16 type;
618 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
619 int err = -ENOSYS;
620
621 udp_tunnel_gro_complete(skb, nhoff);
622
623 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
624 type = eh->h_proto;
625
626 rcu_read_lock();
627 ptype = gro_find_complete_by_type(type);
628 if (ptype != NULL)
629 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
630
631 rcu_read_unlock();
632 return err;
633 }
634
635 /* Notify netdevs that UDP port started listening */
636 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
637 {
638 struct net_device *dev;
639 struct sock *sk = vs->sock->sk;
640 struct net *net = sock_net(sk);
641 sa_family_t sa_family = sk->sk_family;
642 __be16 port = inet_sk(sk)->inet_sport;
643 int err;
644
645 if (sa_family == AF_INET) {
646 err = udp_add_offload(&vs->udp_offloads);
647 if (err)
648 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
649 }
650
651 rcu_read_lock();
652 for_each_netdev_rcu(net, dev) {
653 if (dev->netdev_ops->ndo_add_vxlan_port)
654 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
655 port);
656 }
657 rcu_read_unlock();
658 }
659
660 /* Notify netdevs that UDP port is no more listening */
661 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
662 {
663 struct net_device *dev;
664 struct sock *sk = vs->sock->sk;
665 struct net *net = sock_net(sk);
666 sa_family_t sa_family = sk->sk_family;
667 __be16 port = inet_sk(sk)->inet_sport;
668
669 rcu_read_lock();
670 for_each_netdev_rcu(net, dev) {
671 if (dev->netdev_ops->ndo_del_vxlan_port)
672 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
673 port);
674 }
675 rcu_read_unlock();
676
677 if (sa_family == AF_INET)
678 udp_del_offload(&vs->udp_offloads);
679 }
680
681 /* Add new entry to forwarding table -- assumes lock held */
682 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
683 const u8 *mac, union vxlan_addr *ip,
684 __u16 state, __u16 flags,
685 __be16 port, __u32 vni, __u32 ifindex,
686 __u8 ndm_flags)
687 {
688 struct vxlan_rdst *rd = NULL;
689 struct vxlan_fdb *f;
690 int notify = 0;
691
692 f = __vxlan_find_mac(vxlan, mac);
693 if (f) {
694 if (flags & NLM_F_EXCL) {
695 netdev_dbg(vxlan->dev,
696 "lost race to create %pM\n", mac);
697 return -EEXIST;
698 }
699 if (f->state != state) {
700 f->state = state;
701 f->updated = jiffies;
702 notify = 1;
703 }
704 if (f->flags != ndm_flags) {
705 f->flags = ndm_flags;
706 f->updated = jiffies;
707 notify = 1;
708 }
709 if ((flags & NLM_F_REPLACE)) {
710 /* Only change unicasts */
711 if (!(is_multicast_ether_addr(f->eth_addr) ||
712 is_zero_ether_addr(f->eth_addr))) {
713 int rc = vxlan_fdb_replace(f, ip, port, vni,
714 ifindex);
715
716 if (rc < 0)
717 return rc;
718 notify |= rc;
719 } else
720 return -EOPNOTSUPP;
721 }
722 if ((flags & NLM_F_APPEND) &&
723 (is_multicast_ether_addr(f->eth_addr) ||
724 is_zero_ether_addr(f->eth_addr))) {
725 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
726 &rd);
727
728 if (rc < 0)
729 return rc;
730 notify |= rc;
731 }
732 } else {
733 if (!(flags & NLM_F_CREATE))
734 return -ENOENT;
735
736 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
737 return -ENOSPC;
738
739 /* Disallow replace to add a multicast entry */
740 if ((flags & NLM_F_REPLACE) &&
741 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
742 return -EOPNOTSUPP;
743
744 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
745 f = kmalloc(sizeof(*f), GFP_ATOMIC);
746 if (!f)
747 return -ENOMEM;
748
749 notify = 1;
750 f->state = state;
751 f->flags = ndm_flags;
752 f->updated = f->used = jiffies;
753 INIT_LIST_HEAD(&f->remotes);
754 memcpy(f->eth_addr, mac, ETH_ALEN);
755
756 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
757
758 ++vxlan->addrcnt;
759 hlist_add_head_rcu(&f->hlist,
760 vxlan_fdb_head(vxlan, mac));
761 }
762
763 if (notify) {
764 if (rd == NULL)
765 rd = first_remote_rtnl(f);
766 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
767 }
768
769 return 0;
770 }
771
772 static void vxlan_fdb_free(struct rcu_head *head)
773 {
774 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
775 struct vxlan_rdst *rd, *nd;
776
777 list_for_each_entry_safe(rd, nd, &f->remotes, list)
778 kfree(rd);
779 kfree(f);
780 }
781
782 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
783 {
784 netdev_dbg(vxlan->dev,
785 "delete %pM\n", f->eth_addr);
786
787 --vxlan->addrcnt;
788 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
789
790 hlist_del_rcu(&f->hlist);
791 call_rcu(&f->rcu, vxlan_fdb_free);
792 }
793
794 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
795 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
796 {
797 struct net *net = dev_net(vxlan->dev);
798 int err;
799
800 if (tb[NDA_DST]) {
801 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
802 if (err)
803 return err;
804 } else {
805 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
806 if (remote->sa.sa_family == AF_INET) {
807 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
808 ip->sa.sa_family = AF_INET;
809 #if IS_ENABLED(CONFIG_IPV6)
810 } else {
811 ip->sin6.sin6_addr = in6addr_any;
812 ip->sa.sa_family = AF_INET6;
813 #endif
814 }
815 }
816
817 if (tb[NDA_PORT]) {
818 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
819 return -EINVAL;
820 *port = nla_get_be16(tb[NDA_PORT]);
821 } else {
822 *port = vxlan->dst_port;
823 }
824
825 if (tb[NDA_VNI]) {
826 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
827 return -EINVAL;
828 *vni = nla_get_u32(tb[NDA_VNI]);
829 } else {
830 *vni = vxlan->default_dst.remote_vni;
831 }
832
833 if (tb[NDA_IFINDEX]) {
834 struct net_device *tdev;
835
836 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
837 return -EINVAL;
838 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
839 tdev = __dev_get_by_index(net, *ifindex);
840 if (!tdev)
841 return -EADDRNOTAVAIL;
842 } else {
843 *ifindex = 0;
844 }
845
846 return 0;
847 }
848
849 /* Add static entry (via netlink) */
850 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
851 struct net_device *dev,
852 const unsigned char *addr, u16 vid, u16 flags)
853 {
854 struct vxlan_dev *vxlan = netdev_priv(dev);
855 /* struct net *net = dev_net(vxlan->dev); */
856 union vxlan_addr ip;
857 __be16 port;
858 u32 vni, ifindex;
859 int err;
860
861 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
862 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
863 ndm->ndm_state);
864 return -EINVAL;
865 }
866
867 if (tb[NDA_DST] == NULL)
868 return -EINVAL;
869
870 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
871 if (err)
872 return err;
873
874 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
875 return -EAFNOSUPPORT;
876
877 spin_lock_bh(&vxlan->hash_lock);
878 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
879 port, vni, ifindex, ndm->ndm_flags);
880 spin_unlock_bh(&vxlan->hash_lock);
881
882 return err;
883 }
884
885 /* Delete entry (via netlink) */
886 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
887 struct net_device *dev,
888 const unsigned char *addr, u16 vid)
889 {
890 struct vxlan_dev *vxlan = netdev_priv(dev);
891 struct vxlan_fdb *f;
892 struct vxlan_rdst *rd = NULL;
893 union vxlan_addr ip;
894 __be16 port;
895 u32 vni, ifindex;
896 int err;
897
898 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
899 if (err)
900 return err;
901
902 err = -ENOENT;
903
904 spin_lock_bh(&vxlan->hash_lock);
905 f = vxlan_find_mac(vxlan, addr);
906 if (!f)
907 goto out;
908
909 if (!vxlan_addr_any(&ip)) {
910 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
911 if (!rd)
912 goto out;
913 }
914
915 err = 0;
916
917 /* remove a destination if it's not the only one on the list,
918 * otherwise destroy the fdb entry
919 */
920 if (rd && !list_is_singular(&f->remotes)) {
921 list_del_rcu(&rd->list);
922 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
923 kfree_rcu(rd, rcu);
924 goto out;
925 }
926
927 vxlan_fdb_destroy(vxlan, f);
928
929 out:
930 spin_unlock_bh(&vxlan->hash_lock);
931
932 return err;
933 }
934
935 /* Dump forwarding table */
936 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
937 struct net_device *dev,
938 struct net_device *filter_dev, int idx)
939 {
940 struct vxlan_dev *vxlan = netdev_priv(dev);
941 unsigned int h;
942
943 for (h = 0; h < FDB_HASH_SIZE; ++h) {
944 struct vxlan_fdb *f;
945 int err;
946
947 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
948 struct vxlan_rdst *rd;
949
950 if (idx < cb->args[0])
951 goto skip;
952
953 list_for_each_entry_rcu(rd, &f->remotes, list) {
954 err = vxlan_fdb_info(skb, vxlan, f,
955 NETLINK_CB(cb->skb).portid,
956 cb->nlh->nlmsg_seq,
957 RTM_NEWNEIGH,
958 NLM_F_MULTI, rd);
959 if (err < 0)
960 goto out;
961 }
962 skip:
963 ++idx;
964 }
965 }
966 out:
967 return idx;
968 }
969
970 /* Watch incoming packets to learn mapping between Ethernet address
971 * and Tunnel endpoint.
972 * Return true if packet is bogus and should be droppped.
973 */
974 static bool vxlan_snoop(struct net_device *dev,
975 union vxlan_addr *src_ip, const u8 *src_mac)
976 {
977 struct vxlan_dev *vxlan = netdev_priv(dev);
978 struct vxlan_fdb *f;
979
980 f = vxlan_find_mac(vxlan, src_mac);
981 if (likely(f)) {
982 struct vxlan_rdst *rdst = first_remote_rcu(f);
983
984 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
985 return false;
986
987 /* Don't migrate static entries, drop packets */
988 if (f->state & NUD_NOARP)
989 return true;
990
991 if (net_ratelimit())
992 netdev_info(dev,
993 "%pM migrated from %pIS to %pIS\n",
994 src_mac, &rdst->remote_ip, &src_ip);
995
996 rdst->remote_ip = *src_ip;
997 f->updated = jiffies;
998 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
999 } else {
1000 /* learned new entry */
1001 spin_lock(&vxlan->hash_lock);
1002
1003 /* close off race between vxlan_flush and incoming packets */
1004 if (netif_running(dev))
1005 vxlan_fdb_create(vxlan, src_mac, src_ip,
1006 NUD_REACHABLE,
1007 NLM_F_EXCL|NLM_F_CREATE,
1008 vxlan->dst_port,
1009 vxlan->default_dst.remote_vni,
1010 0, NTF_SELF);
1011 spin_unlock(&vxlan->hash_lock);
1012 }
1013
1014 return false;
1015 }
1016
1017 /* See if multicast group is already in use by other ID */
1018 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1019 {
1020 struct vxlan_dev *vxlan;
1021
1022 /* The vxlan_sock is only used by dev, leaving group has
1023 * no effect on other vxlan devices.
1024 */
1025 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1026 return false;
1027
1028 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1029 if (!netif_running(vxlan->dev) || vxlan == dev)
1030 continue;
1031
1032 if (vxlan->vn_sock != dev->vn_sock)
1033 continue;
1034
1035 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1036 &dev->default_dst.remote_ip))
1037 continue;
1038
1039 if (vxlan->default_dst.remote_ifindex !=
1040 dev->default_dst.remote_ifindex)
1041 continue;
1042
1043 return true;
1044 }
1045
1046 return false;
1047 }
1048
1049 static void vxlan_sock_hold(struct vxlan_sock *vs)
1050 {
1051 atomic_inc(&vs->refcnt);
1052 }
1053
1054 void vxlan_sock_release(struct vxlan_sock *vs)
1055 {
1056 struct sock *sk = vs->sock->sk;
1057 struct net *net = sock_net(sk);
1058 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1059
1060 if (!atomic_dec_and_test(&vs->refcnt))
1061 return;
1062
1063 spin_lock(&vn->sock_lock);
1064 hlist_del_rcu(&vs->hlist);
1065 vxlan_notify_del_rx_port(vs);
1066 spin_unlock(&vn->sock_lock);
1067
1068 queue_work(vxlan_wq, &vs->del_work);
1069 }
1070 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1071
1072 /* Callback to update multicast group membership when first VNI on
1073 * multicast asddress is brought up
1074 * Done as workqueue because ip_mc_join_group acquires RTNL.
1075 */
1076 static void vxlan_igmp_join(struct work_struct *work)
1077 {
1078 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1079 struct vxlan_sock *vs = vxlan->vn_sock;
1080 struct sock *sk = vs->sock->sk;
1081 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1082 int ifindex = vxlan->default_dst.remote_ifindex;
1083
1084 lock_sock(sk);
1085 if (ip->sa.sa_family == AF_INET) {
1086 struct ip_mreqn mreq = {
1087 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1088 .imr_ifindex = ifindex,
1089 };
1090
1091 ip_mc_join_group(sk, &mreq);
1092 #if IS_ENABLED(CONFIG_IPV6)
1093 } else {
1094 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1095 &ip->sin6.sin6_addr);
1096 #endif
1097 }
1098 release_sock(sk);
1099
1100 vxlan_sock_release(vs);
1101 dev_put(vxlan->dev);
1102 }
1103
1104 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1105 static void vxlan_igmp_leave(struct work_struct *work)
1106 {
1107 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1108 struct vxlan_sock *vs = vxlan->vn_sock;
1109 struct sock *sk = vs->sock->sk;
1110 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1111 int ifindex = vxlan->default_dst.remote_ifindex;
1112
1113 lock_sock(sk);
1114 if (ip->sa.sa_family == AF_INET) {
1115 struct ip_mreqn mreq = {
1116 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1117 .imr_ifindex = ifindex,
1118 };
1119
1120 ip_mc_leave_group(sk, &mreq);
1121 #if IS_ENABLED(CONFIG_IPV6)
1122 } else {
1123 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1124 &ip->sin6.sin6_addr);
1125 #endif
1126 }
1127
1128 release_sock(sk);
1129
1130 vxlan_sock_release(vs);
1131 dev_put(vxlan->dev);
1132 }
1133
1134 /* Callback from net/ipv4/udp.c to receive packets */
1135 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1136 {
1137 struct vxlan_sock *vs;
1138 struct vxlanhdr *vxh;
1139
1140 /* Need Vxlan and inner Ethernet header to be present */
1141 if (!pskb_may_pull(skb, VXLAN_HLEN))
1142 goto error;
1143
1144 /* Return packets with reserved bits set */
1145 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1146 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1147 (vxh->vx_vni & htonl(0xff))) {
1148 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1149 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1150 goto error;
1151 }
1152
1153 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1154 goto drop;
1155
1156 vs = rcu_dereference_sk_user_data(sk);
1157 if (!vs)
1158 goto drop;
1159
1160 vs->rcv(vs, skb, vxh->vx_vni);
1161 return 0;
1162
1163 drop:
1164 /* Consume bad packet */
1165 kfree_skb(skb);
1166 return 0;
1167
1168 error:
1169 /* Return non vxlan pkt */
1170 return 1;
1171 }
1172
1173 static void vxlan_rcv(struct vxlan_sock *vs,
1174 struct sk_buff *skb, __be32 vx_vni)
1175 {
1176 struct iphdr *oip = NULL;
1177 struct ipv6hdr *oip6 = NULL;
1178 struct vxlan_dev *vxlan;
1179 struct pcpu_sw_netstats *stats;
1180 union vxlan_addr saddr;
1181 __u32 vni;
1182 int err = 0;
1183 union vxlan_addr *remote_ip;
1184
1185 vni = ntohl(vx_vni) >> 8;
1186 /* Is this VNI defined? */
1187 vxlan = vxlan_vs_find_vni(vs, vni);
1188 if (!vxlan)
1189 goto drop;
1190
1191 remote_ip = &vxlan->default_dst.remote_ip;
1192 skb_reset_mac_header(skb);
1193 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1194 skb->protocol = eth_type_trans(skb, vxlan->dev);
1195 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1196
1197 /* Ignore packet loops (and multicast echo) */
1198 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1199 goto drop;
1200
1201 /* Re-examine inner Ethernet packet */
1202 if (remote_ip->sa.sa_family == AF_INET) {
1203 oip = ip_hdr(skb);
1204 saddr.sin.sin_addr.s_addr = oip->saddr;
1205 saddr.sa.sa_family = AF_INET;
1206 #if IS_ENABLED(CONFIG_IPV6)
1207 } else {
1208 oip6 = ipv6_hdr(skb);
1209 saddr.sin6.sin6_addr = oip6->saddr;
1210 saddr.sa.sa_family = AF_INET6;
1211 #endif
1212 }
1213
1214 if ((vxlan->flags & VXLAN_F_LEARN) &&
1215 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1216 goto drop;
1217
1218 skb_reset_network_header(skb);
1219
1220 if (oip6)
1221 err = IP6_ECN_decapsulate(oip6, skb);
1222 if (oip)
1223 err = IP_ECN_decapsulate(oip, skb);
1224
1225 if (unlikely(err)) {
1226 if (log_ecn_error) {
1227 if (oip6)
1228 net_info_ratelimited("non-ECT from %pI6\n",
1229 &oip6->saddr);
1230 if (oip)
1231 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1232 &oip->saddr, oip->tos);
1233 }
1234 if (err > 1) {
1235 ++vxlan->dev->stats.rx_frame_errors;
1236 ++vxlan->dev->stats.rx_errors;
1237 goto drop;
1238 }
1239 }
1240
1241 stats = this_cpu_ptr(vxlan->dev->tstats);
1242 u64_stats_update_begin(&stats->syncp);
1243 stats->rx_packets++;
1244 stats->rx_bytes += skb->len;
1245 u64_stats_update_end(&stats->syncp);
1246
1247 netif_rx(skb);
1248
1249 return;
1250 drop:
1251 /* Consume bad packet */
1252 kfree_skb(skb);
1253 }
1254
1255 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1256 {
1257 struct vxlan_dev *vxlan = netdev_priv(dev);
1258 struct arphdr *parp;
1259 u8 *arpptr, *sha;
1260 __be32 sip, tip;
1261 struct neighbour *n;
1262
1263 if (dev->flags & IFF_NOARP)
1264 goto out;
1265
1266 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1267 dev->stats.tx_dropped++;
1268 goto out;
1269 }
1270 parp = arp_hdr(skb);
1271
1272 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1273 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1274 parp->ar_pro != htons(ETH_P_IP) ||
1275 parp->ar_op != htons(ARPOP_REQUEST) ||
1276 parp->ar_hln != dev->addr_len ||
1277 parp->ar_pln != 4)
1278 goto out;
1279 arpptr = (u8 *)parp + sizeof(struct arphdr);
1280 sha = arpptr;
1281 arpptr += dev->addr_len; /* sha */
1282 memcpy(&sip, arpptr, sizeof(sip));
1283 arpptr += sizeof(sip);
1284 arpptr += dev->addr_len; /* tha */
1285 memcpy(&tip, arpptr, sizeof(tip));
1286
1287 if (ipv4_is_loopback(tip) ||
1288 ipv4_is_multicast(tip))
1289 goto out;
1290
1291 n = neigh_lookup(&arp_tbl, &tip, dev);
1292
1293 if (n) {
1294 struct vxlan_fdb *f;
1295 struct sk_buff *reply;
1296
1297 if (!(n->nud_state & NUD_CONNECTED)) {
1298 neigh_release(n);
1299 goto out;
1300 }
1301
1302 f = vxlan_find_mac(vxlan, n->ha);
1303 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1304 /* bridge-local neighbor */
1305 neigh_release(n);
1306 goto out;
1307 }
1308
1309 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1310 n->ha, sha);
1311
1312 neigh_release(n);
1313
1314 if (reply == NULL)
1315 goto out;
1316
1317 skb_reset_mac_header(reply);
1318 __skb_pull(reply, skb_network_offset(reply));
1319 reply->ip_summed = CHECKSUM_UNNECESSARY;
1320 reply->pkt_type = PACKET_HOST;
1321
1322 if (netif_rx_ni(reply) == NET_RX_DROP)
1323 dev->stats.rx_dropped++;
1324 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1325 union vxlan_addr ipa = {
1326 .sin.sin_addr.s_addr = tip,
1327 .sin.sin_family = AF_INET,
1328 };
1329
1330 vxlan_ip_miss(dev, &ipa);
1331 }
1332 out:
1333 consume_skb(skb);
1334 return NETDEV_TX_OK;
1335 }
1336
1337 #if IS_ENABLED(CONFIG_IPV6)
1338 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1339 struct neighbour *n, bool isrouter)
1340 {
1341 struct net_device *dev = request->dev;
1342 struct sk_buff *reply;
1343 struct nd_msg *ns, *na;
1344 struct ipv6hdr *pip6;
1345 u8 *daddr;
1346 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1347 int ns_olen;
1348 int i, len;
1349
1350 if (dev == NULL)
1351 return NULL;
1352
1353 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1354 sizeof(*na) + na_olen + dev->needed_tailroom;
1355 reply = alloc_skb(len, GFP_ATOMIC);
1356 if (reply == NULL)
1357 return NULL;
1358
1359 reply->protocol = htons(ETH_P_IPV6);
1360 reply->dev = dev;
1361 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1362 skb_push(reply, sizeof(struct ethhdr));
1363 skb_set_mac_header(reply, 0);
1364
1365 ns = (struct nd_msg *)skb_transport_header(request);
1366
1367 daddr = eth_hdr(request)->h_source;
1368 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1369 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1370 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1371 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1372 break;
1373 }
1374 }
1375
1376 /* Ethernet header */
1377 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1378 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1379 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1380 reply->protocol = htons(ETH_P_IPV6);
1381
1382 skb_pull(reply, sizeof(struct ethhdr));
1383 skb_set_network_header(reply, 0);
1384 skb_put(reply, sizeof(struct ipv6hdr));
1385
1386 /* IPv6 header */
1387
1388 pip6 = ipv6_hdr(reply);
1389 memset(pip6, 0, sizeof(struct ipv6hdr));
1390 pip6->version = 6;
1391 pip6->priority = ipv6_hdr(request)->priority;
1392 pip6->nexthdr = IPPROTO_ICMPV6;
1393 pip6->hop_limit = 255;
1394 pip6->daddr = ipv6_hdr(request)->saddr;
1395 pip6->saddr = *(struct in6_addr *)n->primary_key;
1396
1397 skb_pull(reply, sizeof(struct ipv6hdr));
1398 skb_set_transport_header(reply, 0);
1399
1400 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1401
1402 /* Neighbor Advertisement */
1403 memset(na, 0, sizeof(*na)+na_olen);
1404 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1405 na->icmph.icmp6_router = isrouter;
1406 na->icmph.icmp6_override = 1;
1407 na->icmph.icmp6_solicited = 1;
1408 na->target = ns->target;
1409 ether_addr_copy(&na->opt[2], n->ha);
1410 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1411 na->opt[1] = na_olen >> 3;
1412
1413 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1414 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1415 csum_partial(na, sizeof(*na)+na_olen, 0));
1416
1417 pip6->payload_len = htons(sizeof(*na)+na_olen);
1418
1419 skb_push(reply, sizeof(struct ipv6hdr));
1420
1421 reply->ip_summed = CHECKSUM_UNNECESSARY;
1422
1423 return reply;
1424 }
1425
1426 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1427 {
1428 struct vxlan_dev *vxlan = netdev_priv(dev);
1429 struct nd_msg *msg;
1430 const struct ipv6hdr *iphdr;
1431 const struct in6_addr *saddr, *daddr;
1432 struct neighbour *n;
1433 struct inet6_dev *in6_dev;
1434
1435 in6_dev = __in6_dev_get(dev);
1436 if (!in6_dev)
1437 goto out;
1438
1439 iphdr = ipv6_hdr(skb);
1440 saddr = &iphdr->saddr;
1441 daddr = &iphdr->daddr;
1442
1443 msg = (struct nd_msg *)skb_transport_header(skb);
1444 if (msg->icmph.icmp6_code != 0 ||
1445 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1446 goto out;
1447
1448 if (ipv6_addr_loopback(daddr) ||
1449 ipv6_addr_is_multicast(&msg->target))
1450 goto out;
1451
1452 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1453
1454 if (n) {
1455 struct vxlan_fdb *f;
1456 struct sk_buff *reply;
1457
1458 if (!(n->nud_state & NUD_CONNECTED)) {
1459 neigh_release(n);
1460 goto out;
1461 }
1462
1463 f = vxlan_find_mac(vxlan, n->ha);
1464 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1465 /* bridge-local neighbor */
1466 neigh_release(n);
1467 goto out;
1468 }
1469
1470 reply = vxlan_na_create(skb, n,
1471 !!(f ? f->flags & NTF_ROUTER : 0));
1472
1473 neigh_release(n);
1474
1475 if (reply == NULL)
1476 goto out;
1477
1478 if (netif_rx_ni(reply) == NET_RX_DROP)
1479 dev->stats.rx_dropped++;
1480
1481 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1482 union vxlan_addr ipa = {
1483 .sin6.sin6_addr = msg->target,
1484 .sin6.sin6_family = AF_INET6,
1485 };
1486
1487 vxlan_ip_miss(dev, &ipa);
1488 }
1489
1490 out:
1491 consume_skb(skb);
1492 return NETDEV_TX_OK;
1493 }
1494 #endif
1495
1496 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1497 {
1498 struct vxlan_dev *vxlan = netdev_priv(dev);
1499 struct neighbour *n;
1500
1501 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1502 return false;
1503
1504 n = NULL;
1505 switch (ntohs(eth_hdr(skb)->h_proto)) {
1506 case ETH_P_IP:
1507 {
1508 struct iphdr *pip;
1509
1510 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1511 return false;
1512 pip = ip_hdr(skb);
1513 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1514 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1515 union vxlan_addr ipa = {
1516 .sin.sin_addr.s_addr = pip->daddr,
1517 .sin.sin_family = AF_INET,
1518 };
1519
1520 vxlan_ip_miss(dev, &ipa);
1521 return false;
1522 }
1523
1524 break;
1525 }
1526 #if IS_ENABLED(CONFIG_IPV6)
1527 case ETH_P_IPV6:
1528 {
1529 struct ipv6hdr *pip6;
1530
1531 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1532 return false;
1533 pip6 = ipv6_hdr(skb);
1534 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1535 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1536 union vxlan_addr ipa = {
1537 .sin6.sin6_addr = pip6->daddr,
1538 .sin6.sin6_family = AF_INET6,
1539 };
1540
1541 vxlan_ip_miss(dev, &ipa);
1542 return false;
1543 }
1544
1545 break;
1546 }
1547 #endif
1548 default:
1549 return false;
1550 }
1551
1552 if (n) {
1553 bool diff;
1554
1555 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1556 if (diff) {
1557 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1558 dev->addr_len);
1559 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1560 }
1561 neigh_release(n);
1562 return diff;
1563 }
1564
1565 return false;
1566 }
1567
1568 #if IS_ENABLED(CONFIG_IPV6)
1569 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1570 struct dst_entry *dst, struct sk_buff *skb,
1571 struct net_device *dev, struct in6_addr *saddr,
1572 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1573 __be16 src_port, __be16 dst_port, __be32 vni,
1574 bool xnet)
1575 {
1576 struct vxlanhdr *vxh;
1577 int min_headroom;
1578 int err;
1579 bool udp_sum = !udp_get_no_check6_tx(vs->sock->sk);
1580
1581 skb = udp_tunnel_handle_offloads(skb, udp_sum);
1582 if (IS_ERR(skb))
1583 return -EINVAL;
1584
1585 skb_scrub_packet(skb, xnet);
1586
1587 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1588 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1589 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1590
1591 /* Need space for new headers (invalidates iph ptr) */
1592 err = skb_cow_head(skb, min_headroom);
1593 if (unlikely(err))
1594 return err;
1595
1596 skb = vlan_hwaccel_push_inside(skb);
1597 if (WARN_ON(!skb))
1598 return -ENOMEM;
1599
1600 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1601 vxh->vx_flags = htonl(VXLAN_FLAGS);
1602 vxh->vx_vni = vni;
1603
1604 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1605
1606 udp_tunnel6_xmit_skb(vs->sock, dst, skb, dev, saddr, daddr, prio,
1607 ttl, src_port, dst_port);
1608 return 0;
1609 }
1610 #endif
1611
1612 int vxlan_xmit_skb(struct vxlan_sock *vs,
1613 struct rtable *rt, struct sk_buff *skb,
1614 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1615 __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
1616 {
1617 struct vxlanhdr *vxh;
1618 int min_headroom;
1619 int err;
1620 bool udp_sum = !vs->sock->sk->sk_no_check_tx;
1621
1622 skb = udp_tunnel_handle_offloads(skb, udp_sum);
1623 if (IS_ERR(skb))
1624 return -EINVAL;
1625
1626 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1627 + VXLAN_HLEN + sizeof(struct iphdr)
1628 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1629
1630 /* Need space for new headers (invalidates iph ptr) */
1631 err = skb_cow_head(skb, min_headroom);
1632 if (unlikely(err))
1633 return err;
1634
1635 skb = vlan_hwaccel_push_inside(skb);
1636 if (WARN_ON(!skb))
1637 return -ENOMEM;
1638
1639 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1640 vxh->vx_flags = htonl(VXLAN_FLAGS);
1641 vxh->vx_vni = vni;
1642
1643 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1644
1645 return udp_tunnel_xmit_skb(vs->sock, rt, skb, src, dst, tos,
1646 ttl, df, src_port, dst_port, xnet);
1647 }
1648 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1649
1650 /* Bypass encapsulation if the destination is local */
1651 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1652 struct vxlan_dev *dst_vxlan)
1653 {
1654 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1655 union vxlan_addr loopback;
1656 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1657 struct net_device *dev = skb->dev;
1658 int len = skb->len;
1659
1660 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1661 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1662 skb->pkt_type = PACKET_HOST;
1663 skb->encapsulation = 0;
1664 skb->dev = dst_vxlan->dev;
1665 __skb_pull(skb, skb_network_offset(skb));
1666
1667 if (remote_ip->sa.sa_family == AF_INET) {
1668 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1669 loopback.sa.sa_family = AF_INET;
1670 #if IS_ENABLED(CONFIG_IPV6)
1671 } else {
1672 loopback.sin6.sin6_addr = in6addr_loopback;
1673 loopback.sa.sa_family = AF_INET6;
1674 #endif
1675 }
1676
1677 if (dst_vxlan->flags & VXLAN_F_LEARN)
1678 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1679
1680 u64_stats_update_begin(&tx_stats->syncp);
1681 tx_stats->tx_packets++;
1682 tx_stats->tx_bytes += len;
1683 u64_stats_update_end(&tx_stats->syncp);
1684
1685 if (netif_rx(skb) == NET_RX_SUCCESS) {
1686 u64_stats_update_begin(&rx_stats->syncp);
1687 rx_stats->rx_packets++;
1688 rx_stats->rx_bytes += len;
1689 u64_stats_update_end(&rx_stats->syncp);
1690 } else {
1691 dev->stats.rx_dropped++;
1692 }
1693 }
1694
1695 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1696 struct vxlan_rdst *rdst, bool did_rsc)
1697 {
1698 struct vxlan_dev *vxlan = netdev_priv(dev);
1699 struct rtable *rt = NULL;
1700 const struct iphdr *old_iph;
1701 struct flowi4 fl4;
1702 union vxlan_addr *dst;
1703 __be16 src_port = 0, dst_port;
1704 u32 vni;
1705 __be16 df = 0;
1706 __u8 tos, ttl;
1707 int err;
1708
1709 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1710 vni = rdst->remote_vni;
1711 dst = &rdst->remote_ip;
1712
1713 if (vxlan_addr_any(dst)) {
1714 if (did_rsc) {
1715 /* short-circuited back to local bridge */
1716 vxlan_encap_bypass(skb, vxlan, vxlan);
1717 return;
1718 }
1719 goto drop;
1720 }
1721
1722 old_iph = ip_hdr(skb);
1723
1724 ttl = vxlan->ttl;
1725 if (!ttl && vxlan_addr_multicast(dst))
1726 ttl = 1;
1727
1728 tos = vxlan->tos;
1729 if (tos == 1)
1730 tos = ip_tunnel_get_dsfield(old_iph, skb);
1731
1732 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1733 vxlan->port_max, true);
1734
1735 if (dst->sa.sa_family == AF_INET) {
1736 memset(&fl4, 0, sizeof(fl4));
1737 fl4.flowi4_oif = rdst->remote_ifindex;
1738 fl4.flowi4_tos = RT_TOS(tos);
1739 fl4.daddr = dst->sin.sin_addr.s_addr;
1740 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1741
1742 rt = ip_route_output_key(vxlan->net, &fl4);
1743 if (IS_ERR(rt)) {
1744 netdev_dbg(dev, "no route to %pI4\n",
1745 &dst->sin.sin_addr.s_addr);
1746 dev->stats.tx_carrier_errors++;
1747 goto tx_error;
1748 }
1749
1750 if (rt->dst.dev == dev) {
1751 netdev_dbg(dev, "circular route to %pI4\n",
1752 &dst->sin.sin_addr.s_addr);
1753 dev->stats.collisions++;
1754 goto rt_tx_error;
1755 }
1756
1757 /* Bypass encapsulation if the destination is local */
1758 if (rt->rt_flags & RTCF_LOCAL &&
1759 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1760 struct vxlan_dev *dst_vxlan;
1761
1762 ip_rt_put(rt);
1763 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1764 dst->sa.sa_family, dst_port);
1765 if (!dst_vxlan)
1766 goto tx_error;
1767 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1768 return;
1769 }
1770
1771 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1772 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1773
1774 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1775 fl4.saddr, dst->sin.sin_addr.s_addr,
1776 tos, ttl, df, src_port, dst_port,
1777 htonl(vni << 8),
1778 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1779
1780 if (err < 0)
1781 goto rt_tx_error;
1782 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1783 #if IS_ENABLED(CONFIG_IPV6)
1784 } else {
1785 struct sock *sk = vxlan->vn_sock->sock->sk;
1786 struct dst_entry *ndst;
1787 struct flowi6 fl6;
1788 u32 flags;
1789
1790 memset(&fl6, 0, sizeof(fl6));
1791 fl6.flowi6_oif = rdst->remote_ifindex;
1792 fl6.daddr = dst->sin6.sin6_addr;
1793 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1794 fl6.flowi6_proto = IPPROTO_UDP;
1795
1796 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1797 netdev_dbg(dev, "no route to %pI6\n",
1798 &dst->sin6.sin6_addr);
1799 dev->stats.tx_carrier_errors++;
1800 goto tx_error;
1801 }
1802
1803 if (ndst->dev == dev) {
1804 netdev_dbg(dev, "circular route to %pI6\n",
1805 &dst->sin6.sin6_addr);
1806 dst_release(ndst);
1807 dev->stats.collisions++;
1808 goto tx_error;
1809 }
1810
1811 /* Bypass encapsulation if the destination is local */
1812 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1813 if (flags & RTF_LOCAL &&
1814 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1815 struct vxlan_dev *dst_vxlan;
1816
1817 dst_release(ndst);
1818 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1819 dst->sa.sa_family, dst_port);
1820 if (!dst_vxlan)
1821 goto tx_error;
1822 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1823 return;
1824 }
1825
1826 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1827
1828 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1829 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1830 src_port, dst_port, htonl(vni << 8),
1831 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1832 #endif
1833 }
1834
1835 return;
1836
1837 drop:
1838 dev->stats.tx_dropped++;
1839 goto tx_free;
1840
1841 rt_tx_error:
1842 ip_rt_put(rt);
1843 tx_error:
1844 dev->stats.tx_errors++;
1845 tx_free:
1846 dev_kfree_skb(skb);
1847 }
1848
1849 /* Transmit local packets over Vxlan
1850 *
1851 * Outer IP header inherits ECN and DF from inner header.
1852 * Outer UDP destination is the VXLAN assigned port.
1853 * source port is based on hash of flow
1854 */
1855 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1856 {
1857 struct vxlan_dev *vxlan = netdev_priv(dev);
1858 struct ethhdr *eth;
1859 bool did_rsc = false;
1860 struct vxlan_rdst *rdst, *fdst = NULL;
1861 struct vxlan_fdb *f;
1862
1863 skb_reset_mac_header(skb);
1864 eth = eth_hdr(skb);
1865
1866 if ((vxlan->flags & VXLAN_F_PROXY)) {
1867 if (ntohs(eth->h_proto) == ETH_P_ARP)
1868 return arp_reduce(dev, skb);
1869 #if IS_ENABLED(CONFIG_IPV6)
1870 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1871 pskb_may_pull(skb, sizeof(struct ipv6hdr)
1872 + sizeof(struct nd_msg)) &&
1873 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1874 struct nd_msg *msg;
1875
1876 msg = (struct nd_msg *)skb_transport_header(skb);
1877 if (msg->icmph.icmp6_code == 0 &&
1878 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1879 return neigh_reduce(dev, skb);
1880 }
1881 eth = eth_hdr(skb);
1882 #endif
1883 }
1884
1885 f = vxlan_find_mac(vxlan, eth->h_dest);
1886 did_rsc = false;
1887
1888 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1889 (ntohs(eth->h_proto) == ETH_P_IP ||
1890 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1891 did_rsc = route_shortcircuit(dev, skb);
1892 if (did_rsc)
1893 f = vxlan_find_mac(vxlan, eth->h_dest);
1894 }
1895
1896 if (f == NULL) {
1897 f = vxlan_find_mac(vxlan, all_zeros_mac);
1898 if (f == NULL) {
1899 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1900 !is_multicast_ether_addr(eth->h_dest))
1901 vxlan_fdb_miss(vxlan, eth->h_dest);
1902
1903 dev->stats.tx_dropped++;
1904 kfree_skb(skb);
1905 return NETDEV_TX_OK;
1906 }
1907 }
1908
1909 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1910 struct sk_buff *skb1;
1911
1912 if (!fdst) {
1913 fdst = rdst;
1914 continue;
1915 }
1916 skb1 = skb_clone(skb, GFP_ATOMIC);
1917 if (skb1)
1918 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1919 }
1920
1921 if (fdst)
1922 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1923 else
1924 kfree_skb(skb);
1925 return NETDEV_TX_OK;
1926 }
1927
1928 /* Walk the forwarding table and purge stale entries */
1929 static void vxlan_cleanup(unsigned long arg)
1930 {
1931 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1932 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1933 unsigned int h;
1934
1935 if (!netif_running(vxlan->dev))
1936 return;
1937
1938 spin_lock_bh(&vxlan->hash_lock);
1939 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1940 struct hlist_node *p, *n;
1941 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1942 struct vxlan_fdb *f
1943 = container_of(p, struct vxlan_fdb, hlist);
1944 unsigned long timeout;
1945
1946 if (f->state & NUD_PERMANENT)
1947 continue;
1948
1949 timeout = f->used + vxlan->age_interval * HZ;
1950 if (time_before_eq(timeout, jiffies)) {
1951 netdev_dbg(vxlan->dev,
1952 "garbage collect %pM\n",
1953 f->eth_addr);
1954 f->state = NUD_STALE;
1955 vxlan_fdb_destroy(vxlan, f);
1956 } else if (time_before(timeout, next_timer))
1957 next_timer = timeout;
1958 }
1959 }
1960 spin_unlock_bh(&vxlan->hash_lock);
1961
1962 mod_timer(&vxlan->age_timer, next_timer);
1963 }
1964
1965 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1966 {
1967 __u32 vni = vxlan->default_dst.remote_vni;
1968
1969 vxlan->vn_sock = vs;
1970 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1971 }
1972
1973 /* Setup stats when device is created */
1974 static int vxlan_init(struct net_device *dev)
1975 {
1976 struct vxlan_dev *vxlan = netdev_priv(dev);
1977 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1978 struct vxlan_sock *vs;
1979 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
1980
1981 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1982 if (!dev->tstats)
1983 return -ENOMEM;
1984
1985 spin_lock(&vn->sock_lock);
1986 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
1987 vxlan->dst_port);
1988 if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
1989 /* If we have a socket with same port already, reuse it */
1990 vxlan_vs_add_dev(vs, vxlan);
1991 } else {
1992 /* otherwise make new socket outside of RTNL */
1993 dev_hold(dev);
1994 queue_work(vxlan_wq, &vxlan->sock_work);
1995 }
1996 spin_unlock(&vn->sock_lock);
1997
1998 return 0;
1999 }
2000
2001 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2002 {
2003 struct vxlan_fdb *f;
2004
2005 spin_lock_bh(&vxlan->hash_lock);
2006 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2007 if (f)
2008 vxlan_fdb_destroy(vxlan, f);
2009 spin_unlock_bh(&vxlan->hash_lock);
2010 }
2011
2012 static void vxlan_uninit(struct net_device *dev)
2013 {
2014 struct vxlan_dev *vxlan = netdev_priv(dev);
2015 struct vxlan_sock *vs = vxlan->vn_sock;
2016
2017 vxlan_fdb_delete_default(vxlan);
2018
2019 if (vs)
2020 vxlan_sock_release(vs);
2021 free_percpu(dev->tstats);
2022 }
2023
2024 /* Start ageing timer and join group when device is brought up */
2025 static int vxlan_open(struct net_device *dev)
2026 {
2027 struct vxlan_dev *vxlan = netdev_priv(dev);
2028 struct vxlan_sock *vs = vxlan->vn_sock;
2029
2030 /* socket hasn't been created */
2031 if (!vs)
2032 return -ENOTCONN;
2033
2034 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2035 vxlan_sock_hold(vs);
2036 dev_hold(dev);
2037 queue_work(vxlan_wq, &vxlan->igmp_join);
2038 }
2039
2040 if (vxlan->age_interval)
2041 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2042
2043 return 0;
2044 }
2045
2046 /* Purge the forwarding table */
2047 static void vxlan_flush(struct vxlan_dev *vxlan)
2048 {
2049 unsigned int h;
2050
2051 spin_lock_bh(&vxlan->hash_lock);
2052 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2053 struct hlist_node *p, *n;
2054 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2055 struct vxlan_fdb *f
2056 = container_of(p, struct vxlan_fdb, hlist);
2057 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2058 if (!is_zero_ether_addr(f->eth_addr))
2059 vxlan_fdb_destroy(vxlan, f);
2060 }
2061 }
2062 spin_unlock_bh(&vxlan->hash_lock);
2063 }
2064
2065 /* Cleanup timer and forwarding table on shutdown */
2066 static int vxlan_stop(struct net_device *dev)
2067 {
2068 struct vxlan_dev *vxlan = netdev_priv(dev);
2069 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2070 struct vxlan_sock *vs = vxlan->vn_sock;
2071
2072 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2073 !vxlan_group_used(vn, vxlan)) {
2074 vxlan_sock_hold(vs);
2075 dev_hold(dev);
2076 queue_work(vxlan_wq, &vxlan->igmp_leave);
2077 }
2078
2079 del_timer_sync(&vxlan->age_timer);
2080
2081 vxlan_flush(vxlan);
2082
2083 return 0;
2084 }
2085
2086 /* Stub, nothing needs to be done. */
2087 static void vxlan_set_multicast_list(struct net_device *dev)
2088 {
2089 }
2090
2091 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2092 {
2093 struct vxlan_dev *vxlan = netdev_priv(dev);
2094 struct vxlan_rdst *dst = &vxlan->default_dst;
2095 struct net_device *lowerdev;
2096 int max_mtu;
2097
2098 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2099 if (lowerdev == NULL)
2100 return eth_change_mtu(dev, new_mtu);
2101
2102 if (dst->remote_ip.sa.sa_family == AF_INET6)
2103 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2104 else
2105 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2106
2107 if (new_mtu < 68 || new_mtu > max_mtu)
2108 return -EINVAL;
2109
2110 dev->mtu = new_mtu;
2111 return 0;
2112 }
2113
2114 static const struct net_device_ops vxlan_netdev_ops = {
2115 .ndo_init = vxlan_init,
2116 .ndo_uninit = vxlan_uninit,
2117 .ndo_open = vxlan_open,
2118 .ndo_stop = vxlan_stop,
2119 .ndo_start_xmit = vxlan_xmit,
2120 .ndo_get_stats64 = ip_tunnel_get_stats64,
2121 .ndo_set_rx_mode = vxlan_set_multicast_list,
2122 .ndo_change_mtu = vxlan_change_mtu,
2123 .ndo_validate_addr = eth_validate_addr,
2124 .ndo_set_mac_address = eth_mac_addr,
2125 .ndo_fdb_add = vxlan_fdb_add,
2126 .ndo_fdb_del = vxlan_fdb_delete,
2127 .ndo_fdb_dump = vxlan_fdb_dump,
2128 };
2129
2130 /* Info for udev, that this is a virtual tunnel endpoint */
2131 static struct device_type vxlan_type = {
2132 .name = "vxlan",
2133 };
2134
2135 /* Calls the ndo_add_vxlan_port of the caller in order to
2136 * supply the listening VXLAN udp ports. Callers are expected
2137 * to implement the ndo_add_vxlan_port.
2138 */
2139 void vxlan_get_rx_port(struct net_device *dev)
2140 {
2141 struct vxlan_sock *vs;
2142 struct net *net = dev_net(dev);
2143 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2144 sa_family_t sa_family;
2145 __be16 port;
2146 unsigned int i;
2147
2148 spin_lock(&vn->sock_lock);
2149 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2150 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2151 port = inet_sk(vs->sock->sk)->inet_sport;
2152 sa_family = vs->sock->sk->sk_family;
2153 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2154 port);
2155 }
2156 }
2157 spin_unlock(&vn->sock_lock);
2158 }
2159 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2160
2161 /* Initialize the device structure. */
2162 static void vxlan_setup(struct net_device *dev)
2163 {
2164 struct vxlan_dev *vxlan = netdev_priv(dev);
2165 unsigned int h;
2166
2167 eth_hw_addr_random(dev);
2168 ether_setup(dev);
2169 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2170 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2171 else
2172 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2173
2174 dev->netdev_ops = &vxlan_netdev_ops;
2175 dev->destructor = free_netdev;
2176 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2177
2178 dev->tx_queue_len = 0;
2179 dev->features |= NETIF_F_LLTX;
2180 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2181 dev->features |= NETIF_F_RXCSUM;
2182 dev->features |= NETIF_F_GSO_SOFTWARE;
2183
2184 dev->vlan_features = dev->features;
2185 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2186 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2187 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2188 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2189 netif_keep_dst(dev);
2190 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2191
2192 INIT_LIST_HEAD(&vxlan->next);
2193 spin_lock_init(&vxlan->hash_lock);
2194 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2195 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2196 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2197
2198 init_timer_deferrable(&vxlan->age_timer);
2199 vxlan->age_timer.function = vxlan_cleanup;
2200 vxlan->age_timer.data = (unsigned long) vxlan;
2201
2202 vxlan->dst_port = htons(vxlan_port);
2203
2204 vxlan->dev = dev;
2205
2206 for (h = 0; h < FDB_HASH_SIZE; ++h)
2207 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2208 }
2209
2210 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2211 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2212 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2213 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2214 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2215 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2216 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2217 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2218 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2219 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2220 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2221 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2222 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2223 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2224 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2225 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2226 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2227 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2228 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2229 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2230 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2231 };
2232
2233 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2234 {
2235 if (tb[IFLA_ADDRESS]) {
2236 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2237 pr_debug("invalid link address (not ethernet)\n");
2238 return -EINVAL;
2239 }
2240
2241 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2242 pr_debug("invalid all zero ethernet address\n");
2243 return -EADDRNOTAVAIL;
2244 }
2245 }
2246
2247 if (!data)
2248 return -EINVAL;
2249
2250 if (data[IFLA_VXLAN_ID]) {
2251 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2252 if (id >= VXLAN_VID_MASK)
2253 return -ERANGE;
2254 }
2255
2256 if (data[IFLA_VXLAN_PORT_RANGE]) {
2257 const struct ifla_vxlan_port_range *p
2258 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2259
2260 if (ntohs(p->high) < ntohs(p->low)) {
2261 pr_debug("port range %u .. %u not valid\n",
2262 ntohs(p->low), ntohs(p->high));
2263 return -EINVAL;
2264 }
2265 }
2266
2267 return 0;
2268 }
2269
2270 static void vxlan_get_drvinfo(struct net_device *netdev,
2271 struct ethtool_drvinfo *drvinfo)
2272 {
2273 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2274 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2275 }
2276
2277 static const struct ethtool_ops vxlan_ethtool_ops = {
2278 .get_drvinfo = vxlan_get_drvinfo,
2279 .get_link = ethtool_op_get_link,
2280 };
2281
2282 static void vxlan_del_work(struct work_struct *work)
2283 {
2284 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2285 udp_tunnel_sock_release(vs->sock);
2286 kfree_rcu(vs, rcu);
2287 }
2288
2289 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2290 __be16 port, u32 flags)
2291 {
2292 struct socket *sock;
2293 struct udp_port_cfg udp_conf;
2294 int err;
2295
2296 memset(&udp_conf, 0, sizeof(udp_conf));
2297
2298 if (ipv6) {
2299 udp_conf.family = AF_INET6;
2300 udp_conf.use_udp6_tx_checksums =
2301 !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2302 udp_conf.use_udp6_rx_checksums =
2303 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2304 } else {
2305 udp_conf.family = AF_INET;
2306 udp_conf.local_ip.s_addr = INADDR_ANY;
2307 udp_conf.use_udp_checksums =
2308 !!(flags & VXLAN_F_UDP_CSUM);
2309 }
2310
2311 udp_conf.local_udp_port = port;
2312
2313 /* Open UDP socket */
2314 err = udp_sock_create(net, &udp_conf, &sock);
2315 if (err < 0)
2316 return ERR_PTR(err);
2317
2318 return sock;
2319 }
2320
2321 /* Create new listen socket if needed */
2322 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2323 vxlan_rcv_t *rcv, void *data,
2324 u32 flags)
2325 {
2326 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2327 struct vxlan_sock *vs;
2328 struct socket *sock;
2329 unsigned int h;
2330 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2331 struct udp_tunnel_sock_cfg tunnel_cfg;
2332
2333 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2334 if (!vs)
2335 return ERR_PTR(-ENOMEM);
2336
2337 for (h = 0; h < VNI_HASH_SIZE; ++h)
2338 INIT_HLIST_HEAD(&vs->vni_list[h]);
2339
2340 INIT_WORK(&vs->del_work, vxlan_del_work);
2341
2342 sock = vxlan_create_sock(net, ipv6, port, flags);
2343 if (IS_ERR(sock)) {
2344 kfree(vs);
2345 return ERR_CAST(sock);
2346 }
2347
2348 vs->sock = sock;
2349 atomic_set(&vs->refcnt, 1);
2350 vs->rcv = rcv;
2351 vs->data = data;
2352
2353 /* Initialize the vxlan udp offloads structure */
2354 vs->udp_offloads.port = port;
2355 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2356 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2357
2358 spin_lock(&vn->sock_lock);
2359 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2360 vxlan_notify_add_rx_port(vs);
2361 spin_unlock(&vn->sock_lock);
2362
2363 /* Mark socket as an encapsulation socket. */
2364 tunnel_cfg.sk_user_data = vs;
2365 tunnel_cfg.encap_type = 1;
2366 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2367 tunnel_cfg.encap_destroy = NULL;
2368
2369 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2370
2371 return vs;
2372 }
2373
2374 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2375 vxlan_rcv_t *rcv, void *data,
2376 bool no_share, u32 flags)
2377 {
2378 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2379 struct vxlan_sock *vs;
2380 bool ipv6 = flags & VXLAN_F_IPV6;
2381
2382 vs = vxlan_socket_create(net, port, rcv, data, flags);
2383 if (!IS_ERR(vs))
2384 return vs;
2385
2386 if (no_share) /* Return error if sharing is not allowed. */
2387 return vs;
2388
2389 spin_lock(&vn->sock_lock);
2390 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port);
2391 if (vs && ((vs->rcv != rcv) ||
2392 !atomic_add_unless(&vs->refcnt, 1, 0)))
2393 vs = ERR_PTR(-EBUSY);
2394 spin_unlock(&vn->sock_lock);
2395
2396 if (!vs)
2397 vs = ERR_PTR(-EINVAL);
2398
2399 return vs;
2400 }
2401 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2402
2403 /* Scheduled at device creation to bind to a socket */
2404 static void vxlan_sock_work(struct work_struct *work)
2405 {
2406 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2407 struct net *net = vxlan->net;
2408 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2409 __be16 port = vxlan->dst_port;
2410 struct vxlan_sock *nvs;
2411
2412 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2413 spin_lock(&vn->sock_lock);
2414 if (!IS_ERR(nvs))
2415 vxlan_vs_add_dev(nvs, vxlan);
2416 spin_unlock(&vn->sock_lock);
2417
2418 dev_put(vxlan->dev);
2419 }
2420
2421 static int vxlan_newlink(struct net *net, struct net_device *dev,
2422 struct nlattr *tb[], struct nlattr *data[])
2423 {
2424 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2425 struct vxlan_dev *vxlan = netdev_priv(dev);
2426 struct vxlan_rdst *dst = &vxlan->default_dst;
2427 __u32 vni;
2428 int err;
2429 bool use_ipv6 = false;
2430
2431 if (!data[IFLA_VXLAN_ID])
2432 return -EINVAL;
2433
2434 vxlan->net = dev_net(dev);
2435
2436 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2437 dst->remote_vni = vni;
2438
2439 /* Unless IPv6 is explicitly requested, assume IPv4 */
2440 dst->remote_ip.sa.sa_family = AF_INET;
2441 if (data[IFLA_VXLAN_GROUP]) {
2442 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2443 } else if (data[IFLA_VXLAN_GROUP6]) {
2444 if (!IS_ENABLED(CONFIG_IPV6))
2445 return -EPFNOSUPPORT;
2446
2447 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2448 sizeof(struct in6_addr));
2449 dst->remote_ip.sa.sa_family = AF_INET6;
2450 use_ipv6 = true;
2451 }
2452
2453 if (data[IFLA_VXLAN_LOCAL]) {
2454 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2455 vxlan->saddr.sa.sa_family = AF_INET;
2456 } else if (data[IFLA_VXLAN_LOCAL6]) {
2457 if (!IS_ENABLED(CONFIG_IPV6))
2458 return -EPFNOSUPPORT;
2459
2460 /* TODO: respect scope id */
2461 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2462 sizeof(struct in6_addr));
2463 vxlan->saddr.sa.sa_family = AF_INET6;
2464 use_ipv6 = true;
2465 }
2466
2467 if (data[IFLA_VXLAN_LINK] &&
2468 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2469 struct net_device *lowerdev
2470 = __dev_get_by_index(net, dst->remote_ifindex);
2471
2472 if (!lowerdev) {
2473 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2474 return -ENODEV;
2475 }
2476
2477 #if IS_ENABLED(CONFIG_IPV6)
2478 if (use_ipv6) {
2479 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2480 if (idev && idev->cnf.disable_ipv6) {
2481 pr_info("IPv6 is disabled via sysctl\n");
2482 return -EPERM;
2483 }
2484 vxlan->flags |= VXLAN_F_IPV6;
2485 }
2486 #endif
2487
2488 if (!tb[IFLA_MTU])
2489 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2490
2491 dev->needed_headroom = lowerdev->hard_header_len +
2492 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2493 } else if (use_ipv6)
2494 vxlan->flags |= VXLAN_F_IPV6;
2495
2496 if (data[IFLA_VXLAN_TOS])
2497 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2498
2499 if (data[IFLA_VXLAN_TTL])
2500 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2501
2502 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2503 vxlan->flags |= VXLAN_F_LEARN;
2504
2505 if (data[IFLA_VXLAN_AGEING])
2506 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2507 else
2508 vxlan->age_interval = FDB_AGE_DEFAULT;
2509
2510 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2511 vxlan->flags |= VXLAN_F_PROXY;
2512
2513 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2514 vxlan->flags |= VXLAN_F_RSC;
2515
2516 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2517 vxlan->flags |= VXLAN_F_L2MISS;
2518
2519 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2520 vxlan->flags |= VXLAN_F_L3MISS;
2521
2522 if (data[IFLA_VXLAN_LIMIT])
2523 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2524
2525 if (data[IFLA_VXLAN_PORT_RANGE]) {
2526 const struct ifla_vxlan_port_range *p
2527 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2528 vxlan->port_min = ntohs(p->low);
2529 vxlan->port_max = ntohs(p->high);
2530 }
2531
2532 if (data[IFLA_VXLAN_PORT])
2533 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2534
2535 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2536 vxlan->flags |= VXLAN_F_UDP_CSUM;
2537
2538 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2539 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2540 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2541
2542 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2543 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2544 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2545
2546 if (vxlan_find_vni(net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2547 vxlan->dst_port)) {
2548 pr_info("duplicate VNI %u\n", vni);
2549 return -EEXIST;
2550 }
2551
2552 dev->ethtool_ops = &vxlan_ethtool_ops;
2553
2554 /* create an fdb entry for a valid default destination */
2555 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2556 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2557 &vxlan->default_dst.remote_ip,
2558 NUD_REACHABLE|NUD_PERMANENT,
2559 NLM_F_EXCL|NLM_F_CREATE,
2560 vxlan->dst_port,
2561 vxlan->default_dst.remote_vni,
2562 vxlan->default_dst.remote_ifindex,
2563 NTF_SELF);
2564 if (err)
2565 return err;
2566 }
2567
2568 err = register_netdevice(dev);
2569 if (err) {
2570 vxlan_fdb_delete_default(vxlan);
2571 return err;
2572 }
2573
2574 list_add(&vxlan->next, &vn->vxlan_list);
2575
2576 return 0;
2577 }
2578
2579 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2580 {
2581 struct vxlan_dev *vxlan = netdev_priv(dev);
2582 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2583
2584 spin_lock(&vn->sock_lock);
2585 if (!hlist_unhashed(&vxlan->hlist))
2586 hlist_del_rcu(&vxlan->hlist);
2587 spin_unlock(&vn->sock_lock);
2588
2589 list_del(&vxlan->next);
2590 unregister_netdevice_queue(dev, head);
2591 }
2592
2593 static size_t vxlan_get_size(const struct net_device *dev)
2594 {
2595
2596 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2597 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2598 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2599 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2600 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2601 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2602 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2603 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2604 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2605 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2606 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2607 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2608 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2609 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2610 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2611 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2612 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2613 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2614 0;
2615 }
2616
2617 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2618 {
2619 const struct vxlan_dev *vxlan = netdev_priv(dev);
2620 const struct vxlan_rdst *dst = &vxlan->default_dst;
2621 struct ifla_vxlan_port_range ports = {
2622 .low = htons(vxlan->port_min),
2623 .high = htons(vxlan->port_max),
2624 };
2625
2626 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2627 goto nla_put_failure;
2628
2629 if (!vxlan_addr_any(&dst->remote_ip)) {
2630 if (dst->remote_ip.sa.sa_family == AF_INET) {
2631 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2632 dst->remote_ip.sin.sin_addr.s_addr))
2633 goto nla_put_failure;
2634 #if IS_ENABLED(CONFIG_IPV6)
2635 } else {
2636 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2637 &dst->remote_ip.sin6.sin6_addr))
2638 goto nla_put_failure;
2639 #endif
2640 }
2641 }
2642
2643 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2644 goto nla_put_failure;
2645
2646 if (!vxlan_addr_any(&vxlan->saddr)) {
2647 if (vxlan->saddr.sa.sa_family == AF_INET) {
2648 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2649 vxlan->saddr.sin.sin_addr.s_addr))
2650 goto nla_put_failure;
2651 #if IS_ENABLED(CONFIG_IPV6)
2652 } else {
2653 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2654 &vxlan->saddr.sin6.sin6_addr))
2655 goto nla_put_failure;
2656 #endif
2657 }
2658 }
2659
2660 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2661 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2662 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2663 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2664 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2665 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2666 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2667 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2668 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2669 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2670 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2671 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2672 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2673 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2674 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2675 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2676 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2677 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2678 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2679 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
2680 goto nla_put_failure;
2681
2682 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2683 goto nla_put_failure;
2684
2685 return 0;
2686
2687 nla_put_failure:
2688 return -EMSGSIZE;
2689 }
2690
2691 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2692 .kind = "vxlan",
2693 .maxtype = IFLA_VXLAN_MAX,
2694 .policy = vxlan_policy,
2695 .priv_size = sizeof(struct vxlan_dev),
2696 .setup = vxlan_setup,
2697 .validate = vxlan_validate,
2698 .newlink = vxlan_newlink,
2699 .dellink = vxlan_dellink,
2700 .get_size = vxlan_get_size,
2701 .fill_info = vxlan_fill_info,
2702 };
2703
2704 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2705 struct net_device *dev)
2706 {
2707 struct vxlan_dev *vxlan, *next;
2708 LIST_HEAD(list_kill);
2709
2710 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2711 struct vxlan_rdst *dst = &vxlan->default_dst;
2712
2713 /* In case we created vxlan device with carrier
2714 * and we loose the carrier due to module unload
2715 * we also need to remove vxlan device. In other
2716 * cases, it's not necessary and remote_ifindex
2717 * is 0 here, so no matches.
2718 */
2719 if (dst->remote_ifindex == dev->ifindex)
2720 vxlan_dellink(vxlan->dev, &list_kill);
2721 }
2722
2723 unregister_netdevice_many(&list_kill);
2724 }
2725
2726 static int vxlan_lowerdev_event(struct notifier_block *unused,
2727 unsigned long event, void *ptr)
2728 {
2729 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2730 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2731
2732 if (event == NETDEV_UNREGISTER)
2733 vxlan_handle_lowerdev_unregister(vn, dev);
2734
2735 return NOTIFY_DONE;
2736 }
2737
2738 static struct notifier_block vxlan_notifier_block __read_mostly = {
2739 .notifier_call = vxlan_lowerdev_event,
2740 };
2741
2742 static __net_init int vxlan_init_net(struct net *net)
2743 {
2744 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2745 unsigned int h;
2746
2747 INIT_LIST_HEAD(&vn->vxlan_list);
2748 spin_lock_init(&vn->sock_lock);
2749
2750 for (h = 0; h < PORT_HASH_SIZE; ++h)
2751 INIT_HLIST_HEAD(&vn->sock_list[h]);
2752
2753 return 0;
2754 }
2755
2756 static void __net_exit vxlan_exit_net(struct net *net)
2757 {
2758 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2759 struct vxlan_dev *vxlan, *next;
2760 struct net_device *dev, *aux;
2761 LIST_HEAD(list);
2762
2763 rtnl_lock();
2764 for_each_netdev_safe(net, dev, aux)
2765 if (dev->rtnl_link_ops == &vxlan_link_ops)
2766 unregister_netdevice_queue(dev, &list);
2767
2768 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2769 /* If vxlan->dev is in the same netns, it has already been added
2770 * to the list by the previous loop.
2771 */
2772 if (!net_eq(dev_net(vxlan->dev), net))
2773 unregister_netdevice_queue(dev, &list);
2774 }
2775
2776 unregister_netdevice_many(&list);
2777 rtnl_unlock();
2778 }
2779
2780 static struct pernet_operations vxlan_net_ops = {
2781 .init = vxlan_init_net,
2782 .exit = vxlan_exit_net,
2783 .id = &vxlan_net_id,
2784 .size = sizeof(struct vxlan_net),
2785 };
2786
2787 static int __init vxlan_init_module(void)
2788 {
2789 int rc;
2790
2791 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2792 if (!vxlan_wq)
2793 return -ENOMEM;
2794
2795 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2796
2797 rc = register_pernet_subsys(&vxlan_net_ops);
2798 if (rc)
2799 goto out1;
2800
2801 rc = register_netdevice_notifier(&vxlan_notifier_block);
2802 if (rc)
2803 goto out2;
2804
2805 rc = rtnl_link_register(&vxlan_link_ops);
2806 if (rc)
2807 goto out3;
2808
2809 return 0;
2810 out3:
2811 unregister_netdevice_notifier(&vxlan_notifier_block);
2812 out2:
2813 unregister_pernet_subsys(&vxlan_net_ops);
2814 out1:
2815 destroy_workqueue(vxlan_wq);
2816 return rc;
2817 }
2818 late_initcall(vxlan_init_module);
2819
2820 static void __exit vxlan_cleanup_module(void)
2821 {
2822 rtnl_link_unregister(&vxlan_link_ops);
2823 unregister_netdevice_notifier(&vxlan_notifier_block);
2824 destroy_workqueue(vxlan_wq);
2825 unregister_pernet_subsys(&vxlan_net_ops);
2826 /* rcu_barrier() is called by netns */
2827 }
2828 module_exit(vxlan_cleanup_module);
2829
2830 MODULE_LICENSE("GPL");
2831 MODULE_VERSION(VXLAN_VERSION);
2832 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2833 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2834 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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