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Merge tag 'vfio-v3.17-rc1' of git://github.com/awilliam/linux-vfio
[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 #if IS_ENABLED(CONFIG_IPV6)
46 #include <net/ipv6.h>
47 #include <net/addrconf.h>
48 #include <net/ip6_tunnel.h>
49 #include <net/ip6_checksum.h>
50 #endif
51
52 #define VXLAN_VERSION "0.1"
53
54 #define PORT_HASH_BITS 8
55 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
56 #define VNI_HASH_BITS 10
57 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
58 #define FDB_HASH_BITS 8
59 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
60 #define FDB_AGE_DEFAULT 300 /* 5 min */
61 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
62
63 #define VXLAN_N_VID (1u << 24)
64 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
65 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
66
67 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
68
69 /* VXLAN protocol header */
70 struct vxlanhdr {
71 __be32 vx_flags;
72 __be32 vx_vni;
73 };
74
75 /* UDP port for VXLAN traffic.
76 * The IANA assigned port is 4789, but the Linux default is 8472
77 * for compatibility with early adopters.
78 */
79 static unsigned short vxlan_port __read_mostly = 8472;
80 module_param_named(udp_port, vxlan_port, ushort, 0444);
81 MODULE_PARM_DESC(udp_port, "Destination UDP port");
82
83 static bool log_ecn_error = true;
84 module_param(log_ecn_error, bool, 0644);
85 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
86
87 static int vxlan_net_id;
88
89 static const u8 all_zeros_mac[ETH_ALEN];
90
91 /* per-network namespace private data for this module */
92 struct vxlan_net {
93 struct list_head vxlan_list;
94 struct hlist_head sock_list[PORT_HASH_SIZE];
95 spinlock_t sock_lock;
96 };
97
98 union vxlan_addr {
99 struct sockaddr_in sin;
100 struct sockaddr_in6 sin6;
101 struct sockaddr sa;
102 };
103
104 struct vxlan_rdst {
105 union vxlan_addr remote_ip;
106 __be16 remote_port;
107 u32 remote_vni;
108 u32 remote_ifindex;
109 struct list_head list;
110 struct rcu_head rcu;
111 };
112
113 /* Forwarding table entry */
114 struct vxlan_fdb {
115 struct hlist_node hlist; /* linked list of entries */
116 struct rcu_head rcu;
117 unsigned long updated; /* jiffies */
118 unsigned long used;
119 struct list_head remotes;
120 u16 state; /* see ndm_state */
121 u8 flags; /* see ndm_flags */
122 u8 eth_addr[ETH_ALEN];
123 };
124
125 /* Pseudo network device */
126 struct vxlan_dev {
127 struct hlist_node hlist; /* vni hash table */
128 struct list_head next; /* vxlan's per namespace list */
129 struct vxlan_sock *vn_sock; /* listening socket */
130 struct net_device *dev;
131 struct net *net; /* netns for packet i/o */
132 struct vxlan_rdst default_dst; /* default destination */
133 union vxlan_addr saddr; /* source address */
134 __be16 dst_port;
135 __u16 port_min; /* source port range */
136 __u16 port_max;
137 __u8 tos; /* TOS override */
138 __u8 ttl;
139 u32 flags; /* VXLAN_F_* in vxlan.h */
140
141 struct work_struct sock_work;
142 struct work_struct igmp_join;
143 struct work_struct igmp_leave;
144
145 unsigned long age_interval;
146 struct timer_list age_timer;
147 spinlock_t hash_lock;
148 unsigned int addrcnt;
149 unsigned int addrmax;
150
151 struct hlist_head fdb_head[FDB_HASH_SIZE];
152 };
153
154 /* salt for hash table */
155 static u32 vxlan_salt __read_mostly;
156 static struct workqueue_struct *vxlan_wq;
157
158 static void vxlan_sock_work(struct work_struct *work);
159
160 #if IS_ENABLED(CONFIG_IPV6)
161 static inline
162 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
163 {
164 if (a->sa.sa_family != b->sa.sa_family)
165 return false;
166 if (a->sa.sa_family == AF_INET6)
167 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
168 else
169 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
170 }
171
172 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
173 {
174 if (ipa->sa.sa_family == AF_INET6)
175 return ipv6_addr_any(&ipa->sin6.sin6_addr);
176 else
177 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
178 }
179
180 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
181 {
182 if (ipa->sa.sa_family == AF_INET6)
183 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
184 else
185 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
186 }
187
188 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
189 {
190 if (nla_len(nla) >= sizeof(struct in6_addr)) {
191 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
192 ip->sa.sa_family = AF_INET6;
193 return 0;
194 } else if (nla_len(nla) >= sizeof(__be32)) {
195 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
196 ip->sa.sa_family = AF_INET;
197 return 0;
198 } else {
199 return -EAFNOSUPPORT;
200 }
201 }
202
203 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
204 const union vxlan_addr *ip)
205 {
206 if (ip->sa.sa_family == AF_INET6)
207 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
208 else
209 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
210 }
211
212 #else /* !CONFIG_IPV6 */
213
214 static inline
215 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
216 {
217 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
218 }
219
220 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
221 {
222 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
223 }
224
225 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
226 {
227 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
228 }
229
230 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
231 {
232 if (nla_len(nla) >= sizeof(struct in6_addr)) {
233 return -EAFNOSUPPORT;
234 } else if (nla_len(nla) >= sizeof(__be32)) {
235 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
236 ip->sa.sa_family = AF_INET;
237 return 0;
238 } else {
239 return -EAFNOSUPPORT;
240 }
241 }
242
243 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
244 const union vxlan_addr *ip)
245 {
246 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
247 }
248 #endif
249
250 /* Virtual Network hash table head */
251 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
252 {
253 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
254 }
255
256 /* Socket hash table head */
257 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
258 {
259 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
260
261 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
262 }
263
264 /* First remote destination for a forwarding entry.
265 * Guaranteed to be non-NULL because remotes are never deleted.
266 */
267 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
268 {
269 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
270 }
271
272 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
273 {
274 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
275 }
276
277 /* Find VXLAN socket based on network namespace and UDP port */
278 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
279 {
280 struct vxlan_sock *vs;
281
282 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
283 if (inet_sk(vs->sock->sk)->inet_sport == port)
284 return vs;
285 }
286 return NULL;
287 }
288
289 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
290 {
291 struct vxlan_dev *vxlan;
292
293 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
294 if (vxlan->default_dst.remote_vni == id)
295 return vxlan;
296 }
297
298 return NULL;
299 }
300
301 /* Look up VNI in a per net namespace table */
302 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
303 {
304 struct vxlan_sock *vs;
305
306 vs = vxlan_find_sock(net, port);
307 if (!vs)
308 return NULL;
309
310 return vxlan_vs_find_vni(vs, id);
311 }
312
313 /* Fill in neighbour message in skbuff. */
314 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
315 const struct vxlan_fdb *fdb,
316 u32 portid, u32 seq, int type, unsigned int flags,
317 const struct vxlan_rdst *rdst)
318 {
319 unsigned long now = jiffies;
320 struct nda_cacheinfo ci;
321 struct nlmsghdr *nlh;
322 struct ndmsg *ndm;
323 bool send_ip, send_eth;
324
325 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
326 if (nlh == NULL)
327 return -EMSGSIZE;
328
329 ndm = nlmsg_data(nlh);
330 memset(ndm, 0, sizeof(*ndm));
331
332 send_eth = send_ip = true;
333
334 if (type == RTM_GETNEIGH) {
335 ndm->ndm_family = AF_INET;
336 send_ip = !vxlan_addr_any(&rdst->remote_ip);
337 send_eth = !is_zero_ether_addr(fdb->eth_addr);
338 } else
339 ndm->ndm_family = AF_BRIDGE;
340 ndm->ndm_state = fdb->state;
341 ndm->ndm_ifindex = vxlan->dev->ifindex;
342 ndm->ndm_flags = fdb->flags;
343 ndm->ndm_type = RTN_UNICAST;
344
345 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
346 goto nla_put_failure;
347
348 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
349 goto nla_put_failure;
350
351 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
352 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
353 goto nla_put_failure;
354 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
355 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
356 goto nla_put_failure;
357 if (rdst->remote_ifindex &&
358 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
359 goto nla_put_failure;
360
361 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
362 ci.ndm_confirmed = 0;
363 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
364 ci.ndm_refcnt = 0;
365
366 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
367 goto nla_put_failure;
368
369 return nlmsg_end(skb, nlh);
370
371 nla_put_failure:
372 nlmsg_cancel(skb, nlh);
373 return -EMSGSIZE;
374 }
375
376 static inline size_t vxlan_nlmsg_size(void)
377 {
378 return NLMSG_ALIGN(sizeof(struct ndmsg))
379 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
380 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
381 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
382 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
383 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
384 + nla_total_size(sizeof(struct nda_cacheinfo));
385 }
386
387 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
388 struct vxlan_rdst *rd, int type)
389 {
390 struct net *net = dev_net(vxlan->dev);
391 struct sk_buff *skb;
392 int err = -ENOBUFS;
393
394 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
395 if (skb == NULL)
396 goto errout;
397
398 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
399 if (err < 0) {
400 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
401 WARN_ON(err == -EMSGSIZE);
402 kfree_skb(skb);
403 goto errout;
404 }
405
406 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
407 return;
408 errout:
409 if (err < 0)
410 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
411 }
412
413 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
414 {
415 struct vxlan_dev *vxlan = netdev_priv(dev);
416 struct vxlan_fdb f = {
417 .state = NUD_STALE,
418 };
419 struct vxlan_rdst remote = {
420 .remote_ip = *ipa, /* goes to NDA_DST */
421 .remote_vni = VXLAN_N_VID,
422 };
423
424 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
425 }
426
427 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
428 {
429 struct vxlan_fdb f = {
430 .state = NUD_STALE,
431 };
432 struct vxlan_rdst remote = { };
433
434 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
435
436 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
437 }
438
439 /* Hash Ethernet address */
440 static u32 eth_hash(const unsigned char *addr)
441 {
442 u64 value = get_unaligned((u64 *)addr);
443
444 /* only want 6 bytes */
445 #ifdef __BIG_ENDIAN
446 value >>= 16;
447 #else
448 value <<= 16;
449 #endif
450 return hash_64(value, FDB_HASH_BITS);
451 }
452
453 /* Hash chain to use given mac address */
454 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
455 const u8 *mac)
456 {
457 return &vxlan->fdb_head[eth_hash(mac)];
458 }
459
460 /* Look up Ethernet address in forwarding table */
461 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
462 const u8 *mac)
463 {
464 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
465 struct vxlan_fdb *f;
466
467 hlist_for_each_entry_rcu(f, head, hlist) {
468 if (ether_addr_equal(mac, f->eth_addr))
469 return f;
470 }
471
472 return NULL;
473 }
474
475 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
476 const u8 *mac)
477 {
478 struct vxlan_fdb *f;
479
480 f = __vxlan_find_mac(vxlan, mac);
481 if (f)
482 f->used = jiffies;
483
484 return f;
485 }
486
487 /* caller should hold vxlan->hash_lock */
488 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
489 union vxlan_addr *ip, __be16 port,
490 __u32 vni, __u32 ifindex)
491 {
492 struct vxlan_rdst *rd;
493
494 list_for_each_entry(rd, &f->remotes, list) {
495 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
496 rd->remote_port == port &&
497 rd->remote_vni == vni &&
498 rd->remote_ifindex == ifindex)
499 return rd;
500 }
501
502 return NULL;
503 }
504
505 /* Replace destination of unicast mac */
506 static int vxlan_fdb_replace(struct vxlan_fdb *f,
507 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
508 {
509 struct vxlan_rdst *rd;
510
511 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
512 if (rd)
513 return 0;
514
515 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
516 if (!rd)
517 return 0;
518 rd->remote_ip = *ip;
519 rd->remote_port = port;
520 rd->remote_vni = vni;
521 rd->remote_ifindex = ifindex;
522 return 1;
523 }
524
525 /* Add/update destinations for multicast */
526 static int vxlan_fdb_append(struct vxlan_fdb *f,
527 union vxlan_addr *ip, __be16 port, __u32 vni,
528 __u32 ifindex, struct vxlan_rdst **rdp)
529 {
530 struct vxlan_rdst *rd;
531
532 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
533 if (rd)
534 return 0;
535
536 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
537 if (rd == NULL)
538 return -ENOBUFS;
539 rd->remote_ip = *ip;
540 rd->remote_port = port;
541 rd->remote_vni = vni;
542 rd->remote_ifindex = ifindex;
543
544 list_add_tail_rcu(&rd->list, &f->remotes);
545
546 *rdp = rd;
547 return 1;
548 }
549
550 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
551 {
552 struct sk_buff *p, **pp = NULL;
553 struct vxlanhdr *vh, *vh2;
554 struct ethhdr *eh, *eh2;
555 unsigned int hlen, off_vx, off_eth;
556 const struct packet_offload *ptype;
557 __be16 type;
558 int flush = 1;
559
560 off_vx = skb_gro_offset(skb);
561 hlen = off_vx + sizeof(*vh);
562 vh = skb_gro_header_fast(skb, off_vx);
563 if (skb_gro_header_hard(skb, hlen)) {
564 vh = skb_gro_header_slow(skb, hlen, off_vx);
565 if (unlikely(!vh))
566 goto out;
567 }
568 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
569 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
570
571 off_eth = skb_gro_offset(skb);
572 hlen = off_eth + sizeof(*eh);
573 eh = skb_gro_header_fast(skb, off_eth);
574 if (skb_gro_header_hard(skb, hlen)) {
575 eh = skb_gro_header_slow(skb, hlen, off_eth);
576 if (unlikely(!eh))
577 goto out;
578 }
579
580 flush = 0;
581
582 for (p = *head; p; p = p->next) {
583 if (!NAPI_GRO_CB(p)->same_flow)
584 continue;
585
586 vh2 = (struct vxlanhdr *)(p->data + off_vx);
587 eh2 = (struct ethhdr *)(p->data + off_eth);
588 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
589 NAPI_GRO_CB(p)->same_flow = 0;
590 continue;
591 }
592 }
593
594 type = eh->h_proto;
595
596 rcu_read_lock();
597 ptype = gro_find_receive_by_type(type);
598 if (ptype == NULL) {
599 flush = 1;
600 goto out_unlock;
601 }
602
603 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
604 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
605 pp = ptype->callbacks.gro_receive(head, skb);
606
607 out_unlock:
608 rcu_read_unlock();
609 out:
610 NAPI_GRO_CB(skb)->flush |= flush;
611
612 return pp;
613 }
614
615 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
616 {
617 struct ethhdr *eh;
618 struct packet_offload *ptype;
619 __be16 type;
620 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
621 int err = -ENOSYS;
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 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)
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 rcu_assign_sk_user_data(vs->sock->sk, NULL);
1066 vxlan_notify_del_rx_port(vs);
1067 spin_unlock(&vn->sock_lock);
1068
1069 queue_work(vxlan_wq, &vs->del_work);
1070 }
1071 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1072
1073 /* Callback to update multicast group membership when first VNI on
1074 * multicast asddress is brought up
1075 * Done as workqueue because ip_mc_join_group acquires RTNL.
1076 */
1077 static void vxlan_igmp_join(struct work_struct *work)
1078 {
1079 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1080 struct vxlan_sock *vs = vxlan->vn_sock;
1081 struct sock *sk = vs->sock->sk;
1082 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1083 int ifindex = vxlan->default_dst.remote_ifindex;
1084
1085 lock_sock(sk);
1086 if (ip->sa.sa_family == AF_INET) {
1087 struct ip_mreqn mreq = {
1088 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1089 .imr_ifindex = ifindex,
1090 };
1091
1092 ip_mc_join_group(sk, &mreq);
1093 #if IS_ENABLED(CONFIG_IPV6)
1094 } else {
1095 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1096 &ip->sin6.sin6_addr);
1097 #endif
1098 }
1099 release_sock(sk);
1100
1101 vxlan_sock_release(vs);
1102 dev_put(vxlan->dev);
1103 }
1104
1105 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1106 static void vxlan_igmp_leave(struct work_struct *work)
1107 {
1108 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1109 struct vxlan_sock *vs = vxlan->vn_sock;
1110 struct sock *sk = vs->sock->sk;
1111 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1112 int ifindex = vxlan->default_dst.remote_ifindex;
1113
1114 lock_sock(sk);
1115 if (ip->sa.sa_family == AF_INET) {
1116 struct ip_mreqn mreq = {
1117 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1118 .imr_ifindex = ifindex,
1119 };
1120
1121 ip_mc_leave_group(sk, &mreq);
1122 #if IS_ENABLED(CONFIG_IPV6)
1123 } else {
1124 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1125 &ip->sin6.sin6_addr);
1126 #endif
1127 }
1128
1129 release_sock(sk);
1130
1131 vxlan_sock_release(vs);
1132 dev_put(vxlan->dev);
1133 }
1134
1135 /* Callback from net/ipv4/udp.c to receive packets */
1136 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1137 {
1138 struct vxlan_sock *vs;
1139 struct vxlanhdr *vxh;
1140
1141 /* Need Vxlan and inner Ethernet header to be present */
1142 if (!pskb_may_pull(skb, VXLAN_HLEN))
1143 goto error;
1144
1145 /* Return packets with reserved bits set */
1146 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1147 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1148 (vxh->vx_vni & htonl(0xff))) {
1149 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1150 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1151 goto error;
1152 }
1153
1154 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1155 goto drop;
1156
1157 vs = rcu_dereference_sk_user_data(sk);
1158 if (!vs)
1159 goto drop;
1160
1161 skb_pop_rcv_encapsulation(skb);
1162
1163 vs->rcv(vs, skb, vxh->vx_vni);
1164 return 0;
1165
1166 drop:
1167 /* Consume bad packet */
1168 kfree_skb(skb);
1169 return 0;
1170
1171 error:
1172 /* Return non vxlan pkt */
1173 return 1;
1174 }
1175
1176 static void vxlan_rcv(struct vxlan_sock *vs,
1177 struct sk_buff *skb, __be32 vx_vni)
1178 {
1179 struct iphdr *oip = NULL;
1180 struct ipv6hdr *oip6 = NULL;
1181 struct vxlan_dev *vxlan;
1182 struct pcpu_sw_netstats *stats;
1183 union vxlan_addr saddr;
1184 __u32 vni;
1185 int err = 0;
1186 union vxlan_addr *remote_ip;
1187
1188 vni = ntohl(vx_vni) >> 8;
1189 /* Is this VNI defined? */
1190 vxlan = vxlan_vs_find_vni(vs, vni);
1191 if (!vxlan)
1192 goto drop;
1193
1194 remote_ip = &vxlan->default_dst.remote_ip;
1195 skb_reset_mac_header(skb);
1196 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1197 skb->protocol = eth_type_trans(skb, vxlan->dev);
1198 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1199
1200 /* Ignore packet loops (and multicast echo) */
1201 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1202 goto drop;
1203
1204 /* Re-examine inner Ethernet packet */
1205 if (remote_ip->sa.sa_family == AF_INET) {
1206 oip = ip_hdr(skb);
1207 saddr.sin.sin_addr.s_addr = oip->saddr;
1208 saddr.sa.sa_family = AF_INET;
1209 #if IS_ENABLED(CONFIG_IPV6)
1210 } else {
1211 oip6 = ipv6_hdr(skb);
1212 saddr.sin6.sin6_addr = oip6->saddr;
1213 saddr.sa.sa_family = AF_INET6;
1214 #endif
1215 }
1216
1217 if ((vxlan->flags & VXLAN_F_LEARN) &&
1218 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1219 goto drop;
1220
1221 skb_reset_network_header(skb);
1222
1223 if (oip6)
1224 err = IP6_ECN_decapsulate(oip6, skb);
1225 if (oip)
1226 err = IP_ECN_decapsulate(oip, skb);
1227
1228 if (unlikely(err)) {
1229 if (log_ecn_error) {
1230 if (oip6)
1231 net_info_ratelimited("non-ECT from %pI6\n",
1232 &oip6->saddr);
1233 if (oip)
1234 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1235 &oip->saddr, oip->tos);
1236 }
1237 if (err > 1) {
1238 ++vxlan->dev->stats.rx_frame_errors;
1239 ++vxlan->dev->stats.rx_errors;
1240 goto drop;
1241 }
1242 }
1243
1244 stats = this_cpu_ptr(vxlan->dev->tstats);
1245 u64_stats_update_begin(&stats->syncp);
1246 stats->rx_packets++;
1247 stats->rx_bytes += skb->len;
1248 u64_stats_update_end(&stats->syncp);
1249
1250 netif_rx(skb);
1251
1252 return;
1253 drop:
1254 /* Consume bad packet */
1255 kfree_skb(skb);
1256 }
1257
1258 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1259 {
1260 struct vxlan_dev *vxlan = netdev_priv(dev);
1261 struct arphdr *parp;
1262 u8 *arpptr, *sha;
1263 __be32 sip, tip;
1264 struct neighbour *n;
1265
1266 if (dev->flags & IFF_NOARP)
1267 goto out;
1268
1269 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1270 dev->stats.tx_dropped++;
1271 goto out;
1272 }
1273 parp = arp_hdr(skb);
1274
1275 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1276 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1277 parp->ar_pro != htons(ETH_P_IP) ||
1278 parp->ar_op != htons(ARPOP_REQUEST) ||
1279 parp->ar_hln != dev->addr_len ||
1280 parp->ar_pln != 4)
1281 goto out;
1282 arpptr = (u8 *)parp + sizeof(struct arphdr);
1283 sha = arpptr;
1284 arpptr += dev->addr_len; /* sha */
1285 memcpy(&sip, arpptr, sizeof(sip));
1286 arpptr += sizeof(sip);
1287 arpptr += dev->addr_len; /* tha */
1288 memcpy(&tip, arpptr, sizeof(tip));
1289
1290 if (ipv4_is_loopback(tip) ||
1291 ipv4_is_multicast(tip))
1292 goto out;
1293
1294 n = neigh_lookup(&arp_tbl, &tip, dev);
1295
1296 if (n) {
1297 struct vxlan_fdb *f;
1298 struct sk_buff *reply;
1299
1300 if (!(n->nud_state & NUD_CONNECTED)) {
1301 neigh_release(n);
1302 goto out;
1303 }
1304
1305 f = vxlan_find_mac(vxlan, n->ha);
1306 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1307 /* bridge-local neighbor */
1308 neigh_release(n);
1309 goto out;
1310 }
1311
1312 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1313 n->ha, sha);
1314
1315 neigh_release(n);
1316
1317 if (reply == NULL)
1318 goto out;
1319
1320 skb_reset_mac_header(reply);
1321 __skb_pull(reply, skb_network_offset(reply));
1322 reply->ip_summed = CHECKSUM_UNNECESSARY;
1323 reply->pkt_type = PACKET_HOST;
1324
1325 if (netif_rx_ni(reply) == NET_RX_DROP)
1326 dev->stats.rx_dropped++;
1327 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1328 union vxlan_addr ipa = {
1329 .sin.sin_addr.s_addr = tip,
1330 .sa.sa_family = AF_INET,
1331 };
1332
1333 vxlan_ip_miss(dev, &ipa);
1334 }
1335 out:
1336 consume_skb(skb);
1337 return NETDEV_TX_OK;
1338 }
1339
1340 #if IS_ENABLED(CONFIG_IPV6)
1341
1342 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1343 struct neighbour *n, bool isrouter)
1344 {
1345 struct net_device *dev = request->dev;
1346 struct sk_buff *reply;
1347 struct nd_msg *ns, *na;
1348 struct ipv6hdr *pip6;
1349 u8 *daddr;
1350 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1351 int ns_olen;
1352 int i, len;
1353
1354 if (dev == NULL)
1355 return NULL;
1356
1357 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1358 sizeof(*na) + na_olen + dev->needed_tailroom;
1359 reply = alloc_skb(len, GFP_ATOMIC);
1360 if (reply == NULL)
1361 return NULL;
1362
1363 reply->protocol = htons(ETH_P_IPV6);
1364 reply->dev = dev;
1365 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1366 skb_push(reply, sizeof(struct ethhdr));
1367 skb_set_mac_header(reply, 0);
1368
1369 ns = (struct nd_msg *)skb_transport_header(request);
1370
1371 daddr = eth_hdr(request)->h_source;
1372 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1373 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1374 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1375 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1376 break;
1377 }
1378 }
1379
1380 /* Ethernet header */
1381 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1382 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1383 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1384 reply->protocol = htons(ETH_P_IPV6);
1385
1386 skb_pull(reply, sizeof(struct ethhdr));
1387 skb_set_network_header(reply, 0);
1388 skb_put(reply, sizeof(struct ipv6hdr));
1389
1390 /* IPv6 header */
1391
1392 pip6 = ipv6_hdr(reply);
1393 memset(pip6, 0, sizeof(struct ipv6hdr));
1394 pip6->version = 6;
1395 pip6->priority = ipv6_hdr(request)->priority;
1396 pip6->nexthdr = IPPROTO_ICMPV6;
1397 pip6->hop_limit = 255;
1398 pip6->daddr = ipv6_hdr(request)->saddr;
1399 pip6->saddr = *(struct in6_addr *)n->primary_key;
1400
1401 skb_pull(reply, sizeof(struct ipv6hdr));
1402 skb_set_transport_header(reply, 0);
1403
1404 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1405
1406 /* Neighbor Advertisement */
1407 memset(na, 0, sizeof(*na)+na_olen);
1408 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1409 na->icmph.icmp6_router = isrouter;
1410 na->icmph.icmp6_override = 1;
1411 na->icmph.icmp6_solicited = 1;
1412 na->target = ns->target;
1413 ether_addr_copy(&na->opt[2], n->ha);
1414 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1415 na->opt[1] = na_olen >> 3;
1416
1417 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1418 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1419 csum_partial(na, sizeof(*na)+na_olen, 0));
1420
1421 pip6->payload_len = htons(sizeof(*na)+na_olen);
1422
1423 skb_push(reply, sizeof(struct ipv6hdr));
1424
1425 reply->ip_summed = CHECKSUM_UNNECESSARY;
1426
1427 return reply;
1428 }
1429
1430 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1431 {
1432 struct vxlan_dev *vxlan = netdev_priv(dev);
1433 struct nd_msg *msg;
1434 const struct ipv6hdr *iphdr;
1435 const struct in6_addr *saddr, *daddr;
1436 struct neighbour *n;
1437 struct inet6_dev *in6_dev;
1438
1439 in6_dev = __in6_dev_get(dev);
1440 if (!in6_dev)
1441 goto out;
1442
1443 if (!pskb_may_pull(skb, skb->len))
1444 goto out;
1445
1446 iphdr = ipv6_hdr(skb);
1447 saddr = &iphdr->saddr;
1448 daddr = &iphdr->daddr;
1449
1450 msg = (struct nd_msg *)skb_transport_header(skb);
1451 if (msg->icmph.icmp6_code != 0 ||
1452 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1453 goto out;
1454
1455 if (ipv6_addr_loopback(daddr) ||
1456 ipv6_addr_is_multicast(&msg->target))
1457 goto out;
1458
1459 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1460
1461 if (n) {
1462 struct vxlan_fdb *f;
1463 struct sk_buff *reply;
1464
1465 if (!(n->nud_state & NUD_CONNECTED)) {
1466 neigh_release(n);
1467 goto out;
1468 }
1469
1470 f = vxlan_find_mac(vxlan, n->ha);
1471 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1472 /* bridge-local neighbor */
1473 neigh_release(n);
1474 goto out;
1475 }
1476
1477 reply = vxlan_na_create(skb, n,
1478 !!(f ? f->flags & NTF_ROUTER : 0));
1479
1480 neigh_release(n);
1481
1482 if (reply == NULL)
1483 goto out;
1484
1485 if (netif_rx_ni(reply) == NET_RX_DROP)
1486 dev->stats.rx_dropped++;
1487
1488 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1489 union vxlan_addr ipa = {
1490 .sin6.sin6_addr = msg->target,
1491 .sa.sa_family = AF_INET6,
1492 };
1493
1494 vxlan_ip_miss(dev, &ipa);
1495 }
1496
1497 out:
1498 consume_skb(skb);
1499 return NETDEV_TX_OK;
1500 }
1501 #endif
1502
1503 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1504 {
1505 struct vxlan_dev *vxlan = netdev_priv(dev);
1506 struct neighbour *n;
1507
1508 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1509 return false;
1510
1511 n = NULL;
1512 switch (ntohs(eth_hdr(skb)->h_proto)) {
1513 case ETH_P_IP:
1514 {
1515 struct iphdr *pip;
1516
1517 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1518 return false;
1519 pip = ip_hdr(skb);
1520 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1521 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1522 union vxlan_addr ipa = {
1523 .sin.sin_addr.s_addr = pip->daddr,
1524 .sa.sa_family = AF_INET,
1525 };
1526
1527 vxlan_ip_miss(dev, &ipa);
1528 return false;
1529 }
1530
1531 break;
1532 }
1533 #if IS_ENABLED(CONFIG_IPV6)
1534 case ETH_P_IPV6:
1535 {
1536 struct ipv6hdr *pip6;
1537
1538 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1539 return false;
1540 pip6 = ipv6_hdr(skb);
1541 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1542 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1543 union vxlan_addr ipa = {
1544 .sin6.sin6_addr = pip6->daddr,
1545 .sa.sa_family = AF_INET6,
1546 };
1547
1548 vxlan_ip_miss(dev, &ipa);
1549 return false;
1550 }
1551
1552 break;
1553 }
1554 #endif
1555 default:
1556 return false;
1557 }
1558
1559 if (n) {
1560 bool diff;
1561
1562 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1563 if (diff) {
1564 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1565 dev->addr_len);
1566 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1567 }
1568 neigh_release(n);
1569 return diff;
1570 }
1571
1572 return false;
1573 }
1574
1575 static inline struct sk_buff *vxlan_handle_offloads(struct sk_buff *skb,
1576 bool udp_csum)
1577 {
1578 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1579 return iptunnel_handle_offloads(skb, udp_csum, type);
1580 }
1581
1582 #if IS_ENABLED(CONFIG_IPV6)
1583 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1584 struct dst_entry *dst, struct sk_buff *skb,
1585 struct net_device *dev, struct in6_addr *saddr,
1586 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1587 __be16 src_port, __be16 dst_port, __be32 vni,
1588 bool xnet)
1589 {
1590 struct ipv6hdr *ip6h;
1591 struct vxlanhdr *vxh;
1592 struct udphdr *uh;
1593 int min_headroom;
1594 int err;
1595
1596 skb = vxlan_handle_offloads(skb, !udp_get_no_check6_tx(vs->sock->sk));
1597 if (IS_ERR(skb))
1598 return -EINVAL;
1599
1600 skb_scrub_packet(skb, xnet);
1601
1602 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1603 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1604 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1605
1606 /* Need space for new headers (invalidates iph ptr) */
1607 err = skb_cow_head(skb, min_headroom);
1608 if (unlikely(err))
1609 return err;
1610
1611 if (vlan_tx_tag_present(skb)) {
1612 if (WARN_ON(!__vlan_put_tag(skb,
1613 skb->vlan_proto,
1614 vlan_tx_tag_get(skb))))
1615 return -ENOMEM;
1616
1617 skb->vlan_tci = 0;
1618 }
1619
1620 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1621 vxh->vx_flags = htonl(VXLAN_FLAGS);
1622 vxh->vx_vni = vni;
1623
1624 __skb_push(skb, sizeof(*uh));
1625 skb_reset_transport_header(skb);
1626 uh = udp_hdr(skb);
1627
1628 uh->dest = dst_port;
1629 uh->source = src_port;
1630
1631 uh->len = htons(skb->len);
1632
1633 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1634 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1635 IPSKB_REROUTED);
1636 skb_dst_set(skb, dst);
1637
1638 udp6_set_csum(udp_get_no_check6_tx(vs->sock->sk), skb,
1639 saddr, daddr, skb->len);
1640
1641 __skb_push(skb, sizeof(*ip6h));
1642 skb_reset_network_header(skb);
1643 ip6h = ipv6_hdr(skb);
1644 ip6h->version = 6;
1645 ip6h->priority = prio;
1646 ip6h->flow_lbl[0] = 0;
1647 ip6h->flow_lbl[1] = 0;
1648 ip6h->flow_lbl[2] = 0;
1649 ip6h->payload_len = htons(skb->len);
1650 ip6h->nexthdr = IPPROTO_UDP;
1651 ip6h->hop_limit = ttl;
1652 ip6h->daddr = *daddr;
1653 ip6h->saddr = *saddr;
1654
1655 ip6tunnel_xmit(skb, dev);
1656 return 0;
1657 }
1658 #endif
1659
1660 int vxlan_xmit_skb(struct vxlan_sock *vs,
1661 struct rtable *rt, struct sk_buff *skb,
1662 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1663 __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
1664 {
1665 struct vxlanhdr *vxh;
1666 struct udphdr *uh;
1667 int min_headroom;
1668 int err;
1669
1670 skb = vxlan_handle_offloads(skb, !vs->sock->sk->sk_no_check_tx);
1671 if (IS_ERR(skb))
1672 return -EINVAL;
1673
1674 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1675 + VXLAN_HLEN + sizeof(struct iphdr)
1676 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1677
1678 /* Need space for new headers (invalidates iph ptr) */
1679 err = skb_cow_head(skb, min_headroom);
1680 if (unlikely(err))
1681 return err;
1682
1683 if (vlan_tx_tag_present(skb)) {
1684 if (WARN_ON(!__vlan_put_tag(skb,
1685 skb->vlan_proto,
1686 vlan_tx_tag_get(skb))))
1687 return -ENOMEM;
1688
1689 skb->vlan_tci = 0;
1690 }
1691
1692 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1693 vxh->vx_flags = htonl(VXLAN_FLAGS);
1694 vxh->vx_vni = vni;
1695
1696 __skb_push(skb, sizeof(*uh));
1697 skb_reset_transport_header(skb);
1698 uh = udp_hdr(skb);
1699
1700 uh->dest = dst_port;
1701 uh->source = src_port;
1702
1703 uh->len = htons(skb->len);
1704
1705 udp_set_csum(vs->sock->sk->sk_no_check_tx, skb,
1706 src, dst, skb->len);
1707
1708 return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
1709 tos, ttl, df, xnet);
1710 }
1711 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1712
1713 /* Bypass encapsulation if the destination is local */
1714 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1715 struct vxlan_dev *dst_vxlan)
1716 {
1717 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1718 union vxlan_addr loopback;
1719 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1720
1721 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1722 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1723 skb->pkt_type = PACKET_HOST;
1724 skb->encapsulation = 0;
1725 skb->dev = dst_vxlan->dev;
1726 __skb_pull(skb, skb_network_offset(skb));
1727
1728 if (remote_ip->sa.sa_family == AF_INET) {
1729 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1730 loopback.sa.sa_family = AF_INET;
1731 #if IS_ENABLED(CONFIG_IPV6)
1732 } else {
1733 loopback.sin6.sin6_addr = in6addr_loopback;
1734 loopback.sa.sa_family = AF_INET6;
1735 #endif
1736 }
1737
1738 if (dst_vxlan->flags & VXLAN_F_LEARN)
1739 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1740
1741 u64_stats_update_begin(&tx_stats->syncp);
1742 tx_stats->tx_packets++;
1743 tx_stats->tx_bytes += skb->len;
1744 u64_stats_update_end(&tx_stats->syncp);
1745
1746 if (netif_rx(skb) == NET_RX_SUCCESS) {
1747 u64_stats_update_begin(&rx_stats->syncp);
1748 rx_stats->rx_packets++;
1749 rx_stats->rx_bytes += skb->len;
1750 u64_stats_update_end(&rx_stats->syncp);
1751 } else {
1752 skb->dev->stats.rx_dropped++;
1753 }
1754 }
1755
1756 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1757 struct vxlan_rdst *rdst, bool did_rsc)
1758 {
1759 struct vxlan_dev *vxlan = netdev_priv(dev);
1760 struct rtable *rt = NULL;
1761 const struct iphdr *old_iph;
1762 struct flowi4 fl4;
1763 union vxlan_addr *dst;
1764 __be16 src_port = 0, dst_port;
1765 u32 vni;
1766 __be16 df = 0;
1767 __u8 tos, ttl;
1768 int err;
1769
1770 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1771 vni = rdst->remote_vni;
1772 dst = &rdst->remote_ip;
1773
1774 if (vxlan_addr_any(dst)) {
1775 if (did_rsc) {
1776 /* short-circuited back to local bridge */
1777 vxlan_encap_bypass(skb, vxlan, vxlan);
1778 return;
1779 }
1780 goto drop;
1781 }
1782
1783 old_iph = ip_hdr(skb);
1784
1785 ttl = vxlan->ttl;
1786 if (!ttl && vxlan_addr_multicast(dst))
1787 ttl = 1;
1788
1789 tos = vxlan->tos;
1790 if (tos == 1)
1791 tos = ip_tunnel_get_dsfield(old_iph, skb);
1792
1793 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1794 vxlan->port_max, true);
1795
1796 if (dst->sa.sa_family == AF_INET) {
1797 memset(&fl4, 0, sizeof(fl4));
1798 fl4.flowi4_oif = rdst->remote_ifindex;
1799 fl4.flowi4_tos = RT_TOS(tos);
1800 fl4.daddr = dst->sin.sin_addr.s_addr;
1801 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1802
1803 rt = ip_route_output_key(vxlan->net, &fl4);
1804 if (IS_ERR(rt)) {
1805 netdev_dbg(dev, "no route to %pI4\n",
1806 &dst->sin.sin_addr.s_addr);
1807 dev->stats.tx_carrier_errors++;
1808 goto tx_error;
1809 }
1810
1811 if (rt->dst.dev == dev) {
1812 netdev_dbg(dev, "circular route to %pI4\n",
1813 &dst->sin.sin_addr.s_addr);
1814 dev->stats.collisions++;
1815 goto rt_tx_error;
1816 }
1817
1818 /* Bypass encapsulation if the destination is local */
1819 if (rt->rt_flags & RTCF_LOCAL &&
1820 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1821 struct vxlan_dev *dst_vxlan;
1822
1823 ip_rt_put(rt);
1824 dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
1825 if (!dst_vxlan)
1826 goto tx_error;
1827 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1828 return;
1829 }
1830
1831 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1832 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1833
1834 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1835 fl4.saddr, dst->sin.sin_addr.s_addr,
1836 tos, ttl, df, src_port, dst_port,
1837 htonl(vni << 8),
1838 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1839
1840 if (err < 0)
1841 goto rt_tx_error;
1842 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1843 #if IS_ENABLED(CONFIG_IPV6)
1844 } else {
1845 struct sock *sk = vxlan->vn_sock->sock->sk;
1846 struct dst_entry *ndst;
1847 struct flowi6 fl6;
1848 u32 flags;
1849
1850 memset(&fl6, 0, sizeof(fl6));
1851 fl6.flowi6_oif = rdst->remote_ifindex;
1852 fl6.daddr = dst->sin6.sin6_addr;
1853 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1854 fl6.flowi6_proto = IPPROTO_UDP;
1855
1856 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1857 netdev_dbg(dev, "no route to %pI6\n",
1858 &dst->sin6.sin6_addr);
1859 dev->stats.tx_carrier_errors++;
1860 goto tx_error;
1861 }
1862
1863 if (ndst->dev == dev) {
1864 netdev_dbg(dev, "circular route to %pI6\n",
1865 &dst->sin6.sin6_addr);
1866 dst_release(ndst);
1867 dev->stats.collisions++;
1868 goto tx_error;
1869 }
1870
1871 /* Bypass encapsulation if the destination is local */
1872 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1873 if (flags & RTF_LOCAL &&
1874 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1875 struct vxlan_dev *dst_vxlan;
1876
1877 dst_release(ndst);
1878 dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
1879 if (!dst_vxlan)
1880 goto tx_error;
1881 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1882 return;
1883 }
1884
1885 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1886
1887 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1888 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1889 src_port, dst_port, htonl(vni << 8),
1890 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1891 #endif
1892 }
1893
1894 return;
1895
1896 drop:
1897 dev->stats.tx_dropped++;
1898 goto tx_free;
1899
1900 rt_tx_error:
1901 ip_rt_put(rt);
1902 tx_error:
1903 dev->stats.tx_errors++;
1904 tx_free:
1905 dev_kfree_skb(skb);
1906 }
1907
1908 /* Transmit local packets over Vxlan
1909 *
1910 * Outer IP header inherits ECN and DF from inner header.
1911 * Outer UDP destination is the VXLAN assigned port.
1912 * source port is based on hash of flow
1913 */
1914 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1915 {
1916 struct vxlan_dev *vxlan = netdev_priv(dev);
1917 struct ethhdr *eth;
1918 bool did_rsc = false;
1919 struct vxlan_rdst *rdst, *fdst = NULL;
1920 struct vxlan_fdb *f;
1921
1922 skb_reset_mac_header(skb);
1923 eth = eth_hdr(skb);
1924
1925 if ((vxlan->flags & VXLAN_F_PROXY)) {
1926 if (ntohs(eth->h_proto) == ETH_P_ARP)
1927 return arp_reduce(dev, skb);
1928 #if IS_ENABLED(CONFIG_IPV6)
1929 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1930 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1931 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1932 struct nd_msg *msg;
1933
1934 msg = (struct nd_msg *)skb_transport_header(skb);
1935 if (msg->icmph.icmp6_code == 0 &&
1936 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1937 return neigh_reduce(dev, skb);
1938 }
1939 #endif
1940 }
1941
1942 f = vxlan_find_mac(vxlan, eth->h_dest);
1943 did_rsc = false;
1944
1945 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1946 (ntohs(eth->h_proto) == ETH_P_IP ||
1947 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1948 did_rsc = route_shortcircuit(dev, skb);
1949 if (did_rsc)
1950 f = vxlan_find_mac(vxlan, eth->h_dest);
1951 }
1952
1953 if (f == NULL) {
1954 f = vxlan_find_mac(vxlan, all_zeros_mac);
1955 if (f == NULL) {
1956 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1957 !is_multicast_ether_addr(eth->h_dest))
1958 vxlan_fdb_miss(vxlan, eth->h_dest);
1959
1960 dev->stats.tx_dropped++;
1961 kfree_skb(skb);
1962 return NETDEV_TX_OK;
1963 }
1964 }
1965
1966 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1967 struct sk_buff *skb1;
1968
1969 if (!fdst) {
1970 fdst = rdst;
1971 continue;
1972 }
1973 skb1 = skb_clone(skb, GFP_ATOMIC);
1974 if (skb1)
1975 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1976 }
1977
1978 if (fdst)
1979 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1980 else
1981 kfree_skb(skb);
1982 return NETDEV_TX_OK;
1983 }
1984
1985 /* Walk the forwarding table and purge stale entries */
1986 static void vxlan_cleanup(unsigned long arg)
1987 {
1988 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1989 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1990 unsigned int h;
1991
1992 if (!netif_running(vxlan->dev))
1993 return;
1994
1995 spin_lock_bh(&vxlan->hash_lock);
1996 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1997 struct hlist_node *p, *n;
1998 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1999 struct vxlan_fdb *f
2000 = container_of(p, struct vxlan_fdb, hlist);
2001 unsigned long timeout;
2002
2003 if (f->state & NUD_PERMANENT)
2004 continue;
2005
2006 timeout = f->used + vxlan->age_interval * HZ;
2007 if (time_before_eq(timeout, jiffies)) {
2008 netdev_dbg(vxlan->dev,
2009 "garbage collect %pM\n",
2010 f->eth_addr);
2011 f->state = NUD_STALE;
2012 vxlan_fdb_destroy(vxlan, f);
2013 } else if (time_before(timeout, next_timer))
2014 next_timer = timeout;
2015 }
2016 }
2017 spin_unlock_bh(&vxlan->hash_lock);
2018
2019 mod_timer(&vxlan->age_timer, next_timer);
2020 }
2021
2022 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2023 {
2024 __u32 vni = vxlan->default_dst.remote_vni;
2025
2026 vxlan->vn_sock = vs;
2027 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2028 }
2029
2030 /* Setup stats when device is created */
2031 static int vxlan_init(struct net_device *dev)
2032 {
2033 struct vxlan_dev *vxlan = netdev_priv(dev);
2034 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2035 struct vxlan_sock *vs;
2036
2037 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2038 if (!dev->tstats)
2039 return -ENOMEM;
2040
2041 spin_lock(&vn->sock_lock);
2042 vs = vxlan_find_sock(vxlan->net, vxlan->dst_port);
2043 if (vs) {
2044 /* If we have a socket with same port already, reuse it */
2045 atomic_inc(&vs->refcnt);
2046 vxlan_vs_add_dev(vs, vxlan);
2047 } else {
2048 /* otherwise make new socket outside of RTNL */
2049 dev_hold(dev);
2050 queue_work(vxlan_wq, &vxlan->sock_work);
2051 }
2052 spin_unlock(&vn->sock_lock);
2053
2054 return 0;
2055 }
2056
2057 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2058 {
2059 struct vxlan_fdb *f;
2060
2061 spin_lock_bh(&vxlan->hash_lock);
2062 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2063 if (f)
2064 vxlan_fdb_destroy(vxlan, f);
2065 spin_unlock_bh(&vxlan->hash_lock);
2066 }
2067
2068 static void vxlan_uninit(struct net_device *dev)
2069 {
2070 struct vxlan_dev *vxlan = netdev_priv(dev);
2071 struct vxlan_sock *vs = vxlan->vn_sock;
2072
2073 vxlan_fdb_delete_default(vxlan);
2074
2075 if (vs)
2076 vxlan_sock_release(vs);
2077 free_percpu(dev->tstats);
2078 }
2079
2080 /* Start ageing timer and join group when device is brought up */
2081 static int vxlan_open(struct net_device *dev)
2082 {
2083 struct vxlan_dev *vxlan = netdev_priv(dev);
2084 struct vxlan_sock *vs = vxlan->vn_sock;
2085
2086 /* socket hasn't been created */
2087 if (!vs)
2088 return -ENOTCONN;
2089
2090 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2091 vxlan_sock_hold(vs);
2092 dev_hold(dev);
2093 queue_work(vxlan_wq, &vxlan->igmp_join);
2094 }
2095
2096 if (vxlan->age_interval)
2097 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2098
2099 return 0;
2100 }
2101
2102 /* Purge the forwarding table */
2103 static void vxlan_flush(struct vxlan_dev *vxlan)
2104 {
2105 unsigned int h;
2106
2107 spin_lock_bh(&vxlan->hash_lock);
2108 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2109 struct hlist_node *p, *n;
2110 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2111 struct vxlan_fdb *f
2112 = container_of(p, struct vxlan_fdb, hlist);
2113 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2114 if (!is_zero_ether_addr(f->eth_addr))
2115 vxlan_fdb_destroy(vxlan, f);
2116 }
2117 }
2118 spin_unlock_bh(&vxlan->hash_lock);
2119 }
2120
2121 /* Cleanup timer and forwarding table on shutdown */
2122 static int vxlan_stop(struct net_device *dev)
2123 {
2124 struct vxlan_dev *vxlan = netdev_priv(dev);
2125 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2126 struct vxlan_sock *vs = vxlan->vn_sock;
2127
2128 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2129 !vxlan_group_used(vn, vxlan)) {
2130 vxlan_sock_hold(vs);
2131 dev_hold(dev);
2132 queue_work(vxlan_wq, &vxlan->igmp_leave);
2133 }
2134
2135 del_timer_sync(&vxlan->age_timer);
2136
2137 vxlan_flush(vxlan);
2138
2139 return 0;
2140 }
2141
2142 /* Stub, nothing needs to be done. */
2143 static void vxlan_set_multicast_list(struct net_device *dev)
2144 {
2145 }
2146
2147 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2148 {
2149 struct vxlan_dev *vxlan = netdev_priv(dev);
2150 struct vxlan_rdst *dst = &vxlan->default_dst;
2151 struct net_device *lowerdev;
2152 int max_mtu;
2153
2154 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2155 if (lowerdev == NULL)
2156 return eth_change_mtu(dev, new_mtu);
2157
2158 if (dst->remote_ip.sa.sa_family == AF_INET6)
2159 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2160 else
2161 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2162
2163 if (new_mtu < 68 || new_mtu > max_mtu)
2164 return -EINVAL;
2165
2166 dev->mtu = new_mtu;
2167 return 0;
2168 }
2169
2170 static const struct net_device_ops vxlan_netdev_ops = {
2171 .ndo_init = vxlan_init,
2172 .ndo_uninit = vxlan_uninit,
2173 .ndo_open = vxlan_open,
2174 .ndo_stop = vxlan_stop,
2175 .ndo_start_xmit = vxlan_xmit,
2176 .ndo_get_stats64 = ip_tunnel_get_stats64,
2177 .ndo_set_rx_mode = vxlan_set_multicast_list,
2178 .ndo_change_mtu = vxlan_change_mtu,
2179 .ndo_validate_addr = eth_validate_addr,
2180 .ndo_set_mac_address = eth_mac_addr,
2181 .ndo_fdb_add = vxlan_fdb_add,
2182 .ndo_fdb_del = vxlan_fdb_delete,
2183 .ndo_fdb_dump = vxlan_fdb_dump,
2184 };
2185
2186 /* Info for udev, that this is a virtual tunnel endpoint */
2187 static struct device_type vxlan_type = {
2188 .name = "vxlan",
2189 };
2190
2191 /* Calls the ndo_add_vxlan_port of the caller in order to
2192 * supply the listening VXLAN udp ports. Callers are expected
2193 * to implement the ndo_add_vxlan_port.
2194 */
2195 void vxlan_get_rx_port(struct net_device *dev)
2196 {
2197 struct vxlan_sock *vs;
2198 struct net *net = dev_net(dev);
2199 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2200 sa_family_t sa_family;
2201 __be16 port;
2202 unsigned int i;
2203
2204 spin_lock(&vn->sock_lock);
2205 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2206 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2207 port = inet_sk(vs->sock->sk)->inet_sport;
2208 sa_family = vs->sock->sk->sk_family;
2209 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2210 port);
2211 }
2212 }
2213 spin_unlock(&vn->sock_lock);
2214 }
2215 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2216
2217 /* Initialize the device structure. */
2218 static void vxlan_setup(struct net_device *dev)
2219 {
2220 struct vxlan_dev *vxlan = netdev_priv(dev);
2221 unsigned int h;
2222
2223 eth_hw_addr_random(dev);
2224 ether_setup(dev);
2225 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2226 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2227 else
2228 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2229
2230 dev->netdev_ops = &vxlan_netdev_ops;
2231 dev->destructor = free_netdev;
2232 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2233
2234 dev->tx_queue_len = 0;
2235 dev->features |= NETIF_F_LLTX;
2236 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2237 dev->features |= NETIF_F_RXCSUM;
2238 dev->features |= NETIF_F_GSO_SOFTWARE;
2239
2240 dev->vlan_features = dev->features;
2241 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2242 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2243 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2244 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2245 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2246 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2247
2248 INIT_LIST_HEAD(&vxlan->next);
2249 spin_lock_init(&vxlan->hash_lock);
2250 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2251 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2252 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2253
2254 init_timer_deferrable(&vxlan->age_timer);
2255 vxlan->age_timer.function = vxlan_cleanup;
2256 vxlan->age_timer.data = (unsigned long) vxlan;
2257
2258 vxlan->dst_port = htons(vxlan_port);
2259
2260 vxlan->dev = dev;
2261
2262 for (h = 0; h < FDB_HASH_SIZE; ++h)
2263 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2264 }
2265
2266 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2267 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2268 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2269 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2270 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2271 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2272 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2273 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2274 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2275 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2276 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2277 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2278 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2279 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2280 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2281 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2282 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2283 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2284 };
2285
2286 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2287 {
2288 if (tb[IFLA_ADDRESS]) {
2289 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2290 pr_debug("invalid link address (not ethernet)\n");
2291 return -EINVAL;
2292 }
2293
2294 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2295 pr_debug("invalid all zero ethernet address\n");
2296 return -EADDRNOTAVAIL;
2297 }
2298 }
2299
2300 if (!data)
2301 return -EINVAL;
2302
2303 if (data[IFLA_VXLAN_ID]) {
2304 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2305 if (id >= VXLAN_VID_MASK)
2306 return -ERANGE;
2307 }
2308
2309 if (data[IFLA_VXLAN_PORT_RANGE]) {
2310 const struct ifla_vxlan_port_range *p
2311 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2312
2313 if (ntohs(p->high) < ntohs(p->low)) {
2314 pr_debug("port range %u .. %u not valid\n",
2315 ntohs(p->low), ntohs(p->high));
2316 return -EINVAL;
2317 }
2318 }
2319
2320 return 0;
2321 }
2322
2323 static void vxlan_get_drvinfo(struct net_device *netdev,
2324 struct ethtool_drvinfo *drvinfo)
2325 {
2326 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2327 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2328 }
2329
2330 static const struct ethtool_ops vxlan_ethtool_ops = {
2331 .get_drvinfo = vxlan_get_drvinfo,
2332 .get_link = ethtool_op_get_link,
2333 };
2334
2335 static void vxlan_del_work(struct work_struct *work)
2336 {
2337 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2338
2339 sk_release_kernel(vs->sock->sk);
2340 kfree_rcu(vs, rcu);
2341 }
2342
2343 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2344 __be16 port, u32 flags)
2345 {
2346 struct socket *sock;
2347 struct udp_port_cfg udp_conf;
2348 int err;
2349
2350 memset(&udp_conf, 0, sizeof(udp_conf));
2351
2352 if (ipv6) {
2353 udp_conf.family = AF_INET6;
2354 udp_conf.use_udp6_tx_checksums =
2355 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2356 udp_conf.use_udp6_rx_checksums =
2357 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2358 } else {
2359 udp_conf.family = AF_INET;
2360 udp_conf.local_ip.s_addr = INADDR_ANY;
2361 udp_conf.use_udp_checksums =
2362 !!(flags & VXLAN_F_UDP_CSUM);
2363 }
2364
2365 udp_conf.local_udp_port = port;
2366
2367 /* Open UDP socket */
2368 err = udp_sock_create(net, &udp_conf, &sock);
2369 if (err < 0)
2370 return ERR_PTR(err);
2371
2372 /* Disable multicast loopback */
2373 inet_sk(sock->sk)->mc_loop = 0;
2374
2375 return sock;
2376 }
2377
2378 /* Create new listen socket if needed */
2379 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2380 vxlan_rcv_t *rcv, void *data,
2381 u32 flags)
2382 {
2383 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2384 struct vxlan_sock *vs;
2385 struct socket *sock;
2386 struct sock *sk;
2387 unsigned int h;
2388 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2389
2390 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2391 if (!vs)
2392 return ERR_PTR(-ENOMEM);
2393
2394 for (h = 0; h < VNI_HASH_SIZE; ++h)
2395 INIT_HLIST_HEAD(&vs->vni_list[h]);
2396
2397 INIT_WORK(&vs->del_work, vxlan_del_work);
2398
2399 sock = vxlan_create_sock(net, ipv6, port, flags);
2400 if (IS_ERR(sock)) {
2401 kfree(vs);
2402 return ERR_CAST(sock);
2403 }
2404
2405 vs->sock = sock;
2406 sk = sock->sk;
2407 atomic_set(&vs->refcnt, 1);
2408 vs->rcv = rcv;
2409 vs->data = data;
2410 rcu_assign_sk_user_data(vs->sock->sk, vs);
2411
2412 /* Initialize the vxlan udp offloads structure */
2413 vs->udp_offloads.port = port;
2414 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2415 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2416
2417 spin_lock(&vn->sock_lock);
2418 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2419 vxlan_notify_add_rx_port(vs);
2420 spin_unlock(&vn->sock_lock);
2421
2422 /* Mark socket as an encapsulation socket. */
2423 udp_sk(sk)->encap_type = 1;
2424 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2425 #if IS_ENABLED(CONFIG_IPV6)
2426 if (ipv6)
2427 ipv6_stub->udpv6_encap_enable();
2428 else
2429 #endif
2430 udp_encap_enable();
2431
2432 return vs;
2433 }
2434
2435 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2436 vxlan_rcv_t *rcv, void *data,
2437 bool no_share, u32 flags)
2438 {
2439 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2440 struct vxlan_sock *vs;
2441
2442 vs = vxlan_socket_create(net, port, rcv, data, flags);
2443 if (!IS_ERR(vs))
2444 return vs;
2445
2446 if (no_share) /* Return error if sharing is not allowed. */
2447 return vs;
2448
2449 spin_lock(&vn->sock_lock);
2450 vs = vxlan_find_sock(net, port);
2451 if (vs) {
2452 if (vs->rcv == rcv)
2453 atomic_inc(&vs->refcnt);
2454 else
2455 vs = ERR_PTR(-EBUSY);
2456 }
2457 spin_unlock(&vn->sock_lock);
2458
2459 if (!vs)
2460 vs = ERR_PTR(-EINVAL);
2461
2462 return vs;
2463 }
2464 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2465
2466 /* Scheduled at device creation to bind to a socket */
2467 static void vxlan_sock_work(struct work_struct *work)
2468 {
2469 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2470 struct net *net = vxlan->net;
2471 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2472 __be16 port = vxlan->dst_port;
2473 struct vxlan_sock *nvs;
2474
2475 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2476 spin_lock(&vn->sock_lock);
2477 if (!IS_ERR(nvs))
2478 vxlan_vs_add_dev(nvs, vxlan);
2479 spin_unlock(&vn->sock_lock);
2480
2481 dev_put(vxlan->dev);
2482 }
2483
2484 static int vxlan_newlink(struct net *net, struct net_device *dev,
2485 struct nlattr *tb[], struct nlattr *data[])
2486 {
2487 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2488 struct vxlan_dev *vxlan = netdev_priv(dev);
2489 struct vxlan_rdst *dst = &vxlan->default_dst;
2490 __u32 vni;
2491 int err;
2492 bool use_ipv6 = false;
2493
2494 if (!data[IFLA_VXLAN_ID])
2495 return -EINVAL;
2496
2497 vxlan->net = dev_net(dev);
2498
2499 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2500 dst->remote_vni = vni;
2501
2502 /* Unless IPv6 is explicitly requested, assume IPv4 */
2503 dst->remote_ip.sa.sa_family = AF_INET;
2504 if (data[IFLA_VXLAN_GROUP]) {
2505 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2506 } else if (data[IFLA_VXLAN_GROUP6]) {
2507 if (!IS_ENABLED(CONFIG_IPV6))
2508 return -EPFNOSUPPORT;
2509
2510 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2511 sizeof(struct in6_addr));
2512 dst->remote_ip.sa.sa_family = AF_INET6;
2513 use_ipv6 = true;
2514 }
2515
2516 if (data[IFLA_VXLAN_LOCAL]) {
2517 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2518 vxlan->saddr.sa.sa_family = AF_INET;
2519 } else if (data[IFLA_VXLAN_LOCAL6]) {
2520 if (!IS_ENABLED(CONFIG_IPV6))
2521 return -EPFNOSUPPORT;
2522
2523 /* TODO: respect scope id */
2524 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2525 sizeof(struct in6_addr));
2526 vxlan->saddr.sa.sa_family = AF_INET6;
2527 use_ipv6 = true;
2528 }
2529
2530 if (data[IFLA_VXLAN_LINK] &&
2531 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2532 struct net_device *lowerdev
2533 = __dev_get_by_index(net, dst->remote_ifindex);
2534
2535 if (!lowerdev) {
2536 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2537 return -ENODEV;
2538 }
2539
2540 #if IS_ENABLED(CONFIG_IPV6)
2541 if (use_ipv6) {
2542 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2543 if (idev && idev->cnf.disable_ipv6) {
2544 pr_info("IPv6 is disabled via sysctl\n");
2545 return -EPERM;
2546 }
2547 vxlan->flags |= VXLAN_F_IPV6;
2548 }
2549 #endif
2550
2551 if (!tb[IFLA_MTU])
2552 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2553
2554 dev->needed_headroom = lowerdev->hard_header_len +
2555 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2556 } else if (use_ipv6)
2557 vxlan->flags |= VXLAN_F_IPV6;
2558
2559 if (data[IFLA_VXLAN_TOS])
2560 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2561
2562 if (data[IFLA_VXLAN_TTL])
2563 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2564
2565 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2566 vxlan->flags |= VXLAN_F_LEARN;
2567
2568 if (data[IFLA_VXLAN_AGEING])
2569 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2570 else
2571 vxlan->age_interval = FDB_AGE_DEFAULT;
2572
2573 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2574 vxlan->flags |= VXLAN_F_PROXY;
2575
2576 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2577 vxlan->flags |= VXLAN_F_RSC;
2578
2579 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2580 vxlan->flags |= VXLAN_F_L2MISS;
2581
2582 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2583 vxlan->flags |= VXLAN_F_L3MISS;
2584
2585 if (data[IFLA_VXLAN_LIMIT])
2586 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2587
2588 if (data[IFLA_VXLAN_PORT_RANGE]) {
2589 const struct ifla_vxlan_port_range *p
2590 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2591 vxlan->port_min = ntohs(p->low);
2592 vxlan->port_max = ntohs(p->high);
2593 }
2594
2595 if (data[IFLA_VXLAN_PORT])
2596 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2597
2598 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2599 vxlan->flags |= VXLAN_F_UDP_CSUM;
2600
2601 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2602 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2603 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2604
2605 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2606 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2607 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2608
2609 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2610 pr_info("duplicate VNI %u\n", vni);
2611 return -EEXIST;
2612 }
2613
2614 dev->ethtool_ops = &vxlan_ethtool_ops;
2615
2616 /* create an fdb entry for a valid default destination */
2617 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2618 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2619 &vxlan->default_dst.remote_ip,
2620 NUD_REACHABLE|NUD_PERMANENT,
2621 NLM_F_EXCL|NLM_F_CREATE,
2622 vxlan->dst_port,
2623 vxlan->default_dst.remote_vni,
2624 vxlan->default_dst.remote_ifindex,
2625 NTF_SELF);
2626 if (err)
2627 return err;
2628 }
2629
2630 err = register_netdevice(dev);
2631 if (err) {
2632 vxlan_fdb_delete_default(vxlan);
2633 return err;
2634 }
2635
2636 list_add(&vxlan->next, &vn->vxlan_list);
2637
2638 return 0;
2639 }
2640
2641 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2642 {
2643 struct vxlan_dev *vxlan = netdev_priv(dev);
2644 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2645
2646 spin_lock(&vn->sock_lock);
2647 if (!hlist_unhashed(&vxlan->hlist))
2648 hlist_del_rcu(&vxlan->hlist);
2649 spin_unlock(&vn->sock_lock);
2650
2651 list_del(&vxlan->next);
2652 unregister_netdevice_queue(dev, head);
2653 }
2654
2655 static size_t vxlan_get_size(const struct net_device *dev)
2656 {
2657
2658 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2659 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2660 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2661 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2662 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2663 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2664 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2665 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2666 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2667 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2668 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2669 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2670 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2671 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2672 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2673 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2674 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2675 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2676 0;
2677 }
2678
2679 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2680 {
2681 const struct vxlan_dev *vxlan = netdev_priv(dev);
2682 const struct vxlan_rdst *dst = &vxlan->default_dst;
2683 struct ifla_vxlan_port_range ports = {
2684 .low = htons(vxlan->port_min),
2685 .high = htons(vxlan->port_max),
2686 };
2687
2688 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2689 goto nla_put_failure;
2690
2691 if (!vxlan_addr_any(&dst->remote_ip)) {
2692 if (dst->remote_ip.sa.sa_family == AF_INET) {
2693 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2694 dst->remote_ip.sin.sin_addr.s_addr))
2695 goto nla_put_failure;
2696 #if IS_ENABLED(CONFIG_IPV6)
2697 } else {
2698 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2699 &dst->remote_ip.sin6.sin6_addr))
2700 goto nla_put_failure;
2701 #endif
2702 }
2703 }
2704
2705 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2706 goto nla_put_failure;
2707
2708 if (!vxlan_addr_any(&vxlan->saddr)) {
2709 if (vxlan->saddr.sa.sa_family == AF_INET) {
2710 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2711 vxlan->saddr.sin.sin_addr.s_addr))
2712 goto nla_put_failure;
2713 #if IS_ENABLED(CONFIG_IPV6)
2714 } else {
2715 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2716 &vxlan->saddr.sin6.sin6_addr))
2717 goto nla_put_failure;
2718 #endif
2719 }
2720 }
2721
2722 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2723 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2724 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2725 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2726 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2727 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2728 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2729 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2730 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2731 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2732 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2733 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2734 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2735 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2736 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2737 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2738 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2739 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2740 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2741 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
2742 goto nla_put_failure;
2743
2744 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2745 goto nla_put_failure;
2746
2747 return 0;
2748
2749 nla_put_failure:
2750 return -EMSGSIZE;
2751 }
2752
2753 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2754 .kind = "vxlan",
2755 .maxtype = IFLA_VXLAN_MAX,
2756 .policy = vxlan_policy,
2757 .priv_size = sizeof(struct vxlan_dev),
2758 .setup = vxlan_setup,
2759 .validate = vxlan_validate,
2760 .newlink = vxlan_newlink,
2761 .dellink = vxlan_dellink,
2762 .get_size = vxlan_get_size,
2763 .fill_info = vxlan_fill_info,
2764 };
2765
2766 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2767 struct net_device *dev)
2768 {
2769 struct vxlan_dev *vxlan, *next;
2770 LIST_HEAD(list_kill);
2771
2772 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2773 struct vxlan_rdst *dst = &vxlan->default_dst;
2774
2775 /* In case we created vxlan device with carrier
2776 * and we loose the carrier due to module unload
2777 * we also need to remove vxlan device. In other
2778 * cases, it's not necessary and remote_ifindex
2779 * is 0 here, so no matches.
2780 */
2781 if (dst->remote_ifindex == dev->ifindex)
2782 vxlan_dellink(vxlan->dev, &list_kill);
2783 }
2784
2785 unregister_netdevice_many(&list_kill);
2786 }
2787
2788 static int vxlan_lowerdev_event(struct notifier_block *unused,
2789 unsigned long event, void *ptr)
2790 {
2791 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2792 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2793
2794 if (event == NETDEV_UNREGISTER)
2795 vxlan_handle_lowerdev_unregister(vn, dev);
2796
2797 return NOTIFY_DONE;
2798 }
2799
2800 static struct notifier_block vxlan_notifier_block __read_mostly = {
2801 .notifier_call = vxlan_lowerdev_event,
2802 };
2803
2804 static __net_init int vxlan_init_net(struct net *net)
2805 {
2806 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2807 unsigned int h;
2808
2809 INIT_LIST_HEAD(&vn->vxlan_list);
2810 spin_lock_init(&vn->sock_lock);
2811
2812 for (h = 0; h < PORT_HASH_SIZE; ++h)
2813 INIT_HLIST_HEAD(&vn->sock_list[h]);
2814
2815 return 0;
2816 }
2817
2818 static void __net_exit vxlan_exit_net(struct net *net)
2819 {
2820 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2821 struct vxlan_dev *vxlan, *next;
2822 struct net_device *dev, *aux;
2823 LIST_HEAD(list);
2824
2825 rtnl_lock();
2826 for_each_netdev_safe(net, dev, aux)
2827 if (dev->rtnl_link_ops == &vxlan_link_ops)
2828 unregister_netdevice_queue(dev, &list);
2829
2830 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2831 /* If vxlan->dev is in the same netns, it has already been added
2832 * to the list by the previous loop.
2833 */
2834 if (!net_eq(dev_net(vxlan->dev), net))
2835 unregister_netdevice_queue(dev, &list);
2836 }
2837
2838 unregister_netdevice_many(&list);
2839 rtnl_unlock();
2840 }
2841
2842 static struct pernet_operations vxlan_net_ops = {
2843 .init = vxlan_init_net,
2844 .exit = vxlan_exit_net,
2845 .id = &vxlan_net_id,
2846 .size = sizeof(struct vxlan_net),
2847 };
2848
2849 static int __init vxlan_init_module(void)
2850 {
2851 int rc;
2852
2853 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2854 if (!vxlan_wq)
2855 return -ENOMEM;
2856
2857 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2858
2859 rc = register_pernet_subsys(&vxlan_net_ops);
2860 if (rc)
2861 goto out1;
2862
2863 rc = register_netdevice_notifier(&vxlan_notifier_block);
2864 if (rc)
2865 goto out2;
2866
2867 rc = rtnl_link_register(&vxlan_link_ops);
2868 if (rc)
2869 goto out3;
2870
2871 return 0;
2872 out3:
2873 unregister_netdevice_notifier(&vxlan_notifier_block);
2874 out2:
2875 unregister_pernet_subsys(&vxlan_net_ops);
2876 out1:
2877 destroy_workqueue(vxlan_wq);
2878 return rc;
2879 }
2880 late_initcall(vxlan_init_module);
2881
2882 static void __exit vxlan_cleanup_module(void)
2883 {
2884 rtnl_link_unregister(&vxlan_link_ops);
2885 unregister_netdevice_notifier(&vxlan_notifier_block);
2886 destroy_workqueue(vxlan_wq);
2887 unregister_pernet_subsys(&vxlan_net_ops);
2888 /* rcu_barrier() is called by netns */
2889 }
2890 module_exit(vxlan_cleanup_module);
2891
2892 MODULE_LICENSE("GPL");
2893 MODULE_VERSION(VXLAN_VERSION);
2894 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2895 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2896 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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