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net: vxlan: do not use vxlan_net before checking event type
[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/rtnetlink.h>
37 #include <net/route.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
40 #include <net/net_namespace.h>
41 #include <net/netns/generic.h>
42 #include <net/vxlan.h>
43 #if IS_ENABLED(CONFIG_IPV6)
44 #include <net/ipv6.h>
45 #include <net/addrconf.h>
46 #include <net/ip6_tunnel.h>
47 #include <net/ip6_checksum.h>
48 #endif
49
50 #define VXLAN_VERSION "0.1"
51
52 #define PORT_HASH_BITS 8
53 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
54 #define VNI_HASH_BITS 10
55 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
56 #define FDB_HASH_BITS 8
57 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
61 #define VXLAN_N_VID (1u << 24)
62 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
63 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
64
65 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
66
67 /* VXLAN protocol header */
68 struct vxlanhdr {
69 __be32 vx_flags;
70 __be32 vx_vni;
71 };
72
73 /* UDP port for VXLAN traffic.
74 * The IANA assigned port is 4789, but the Linux default is 8472
75 * for compatibility with early adopters.
76 */
77 static unsigned short vxlan_port __read_mostly = 8472;
78 module_param_named(udp_port, vxlan_port, ushort, 0444);
79 MODULE_PARM_DESC(udp_port, "Destination UDP port");
80
81 static bool log_ecn_error = true;
82 module_param(log_ecn_error, bool, 0644);
83 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
84
85 static int vxlan_net_id;
86
87 static const u8 all_zeros_mac[ETH_ALEN];
88
89 /* per-network namespace private data for this module */
90 struct vxlan_net {
91 struct list_head vxlan_list;
92 struct hlist_head sock_list[PORT_HASH_SIZE];
93 spinlock_t sock_lock;
94 };
95
96 union vxlan_addr {
97 struct sockaddr_in sin;
98 struct sockaddr_in6 sin6;
99 struct sockaddr sa;
100 };
101
102 struct vxlan_rdst {
103 union vxlan_addr remote_ip;
104 __be16 remote_port;
105 u32 remote_vni;
106 u32 remote_ifindex;
107 struct list_head list;
108 struct rcu_head rcu;
109 };
110
111 /* Forwarding table entry */
112 struct vxlan_fdb {
113 struct hlist_node hlist; /* linked list of entries */
114 struct rcu_head rcu;
115 unsigned long updated; /* jiffies */
116 unsigned long used;
117 struct list_head remotes;
118 u16 state; /* see ndm_state */
119 u8 flags; /* see ndm_flags */
120 u8 eth_addr[ETH_ALEN];
121 };
122
123 /* Pseudo network device */
124 struct vxlan_dev {
125 struct hlist_node hlist; /* vni hash table */
126 struct list_head next; /* vxlan's per namespace list */
127 struct vxlan_sock *vn_sock; /* listening socket */
128 struct net_device *dev;
129 struct vxlan_rdst default_dst; /* default destination */
130 union vxlan_addr saddr; /* source address */
131 __be16 dst_port;
132 __u16 port_min; /* source port range */
133 __u16 port_max;
134 __u8 tos; /* TOS override */
135 __u8 ttl;
136 u32 flags; /* VXLAN_F_* below */
137
138 struct work_struct sock_work;
139 struct work_struct igmp_join;
140 struct work_struct igmp_leave;
141
142 unsigned long age_interval;
143 struct timer_list age_timer;
144 spinlock_t hash_lock;
145 unsigned int addrcnt;
146 unsigned int addrmax;
147
148 struct hlist_head fdb_head[FDB_HASH_SIZE];
149 };
150
151 #define VXLAN_F_LEARN 0x01
152 #define VXLAN_F_PROXY 0x02
153 #define VXLAN_F_RSC 0x04
154 #define VXLAN_F_L2MISS 0x08
155 #define VXLAN_F_L3MISS 0x10
156 #define VXLAN_F_IPV6 0x20 /* internal flag */
157
158 /* salt for hash table */
159 static u32 vxlan_salt __read_mostly;
160 static struct workqueue_struct *vxlan_wq;
161
162 static void vxlan_sock_work(struct work_struct *work);
163
164 #if IS_ENABLED(CONFIG_IPV6)
165 static inline
166 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
167 {
168 if (a->sa.sa_family != b->sa.sa_family)
169 return false;
170 if (a->sa.sa_family == AF_INET6)
171 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
172 else
173 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
174 }
175
176 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
177 {
178 if (ipa->sa.sa_family == AF_INET6)
179 return ipv6_addr_any(&ipa->sin6.sin6_addr);
180 else
181 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
182 }
183
184 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
185 {
186 if (ipa->sa.sa_family == AF_INET6)
187 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
188 else
189 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
190 }
191
192 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
193 {
194 if (nla_len(nla) >= sizeof(struct in6_addr)) {
195 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
196 ip->sa.sa_family = AF_INET6;
197 return 0;
198 } else if (nla_len(nla) >= sizeof(__be32)) {
199 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
200 ip->sa.sa_family = AF_INET;
201 return 0;
202 } else {
203 return -EAFNOSUPPORT;
204 }
205 }
206
207 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
208 const union vxlan_addr *ip)
209 {
210 if (ip->sa.sa_family == AF_INET6)
211 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
212 else
213 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
214 }
215
216 #else /* !CONFIG_IPV6 */
217
218 static inline
219 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
220 {
221 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
222 }
223
224 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
225 {
226 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
227 }
228
229 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
230 {
231 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
232 }
233
234 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
235 {
236 if (nla_len(nla) >= sizeof(struct in6_addr)) {
237 return -EAFNOSUPPORT;
238 } else if (nla_len(nla) >= sizeof(__be32)) {
239 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
240 ip->sa.sa_family = AF_INET;
241 return 0;
242 } else {
243 return -EAFNOSUPPORT;
244 }
245 }
246
247 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
248 const union vxlan_addr *ip)
249 {
250 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
251 }
252 #endif
253
254 /* Virtual Network hash table head */
255 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
256 {
257 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
258 }
259
260 /* Socket hash table head */
261 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
262 {
263 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
264
265 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
266 }
267
268 /* First remote destination for a forwarding entry.
269 * Guaranteed to be non-NULL because remotes are never deleted.
270 */
271 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
272 {
273 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
274 }
275
276 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
277 {
278 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
279 }
280
281 /* Find VXLAN socket based on network namespace and UDP port */
282 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
283 {
284 struct vxlan_sock *vs;
285
286 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
287 if (inet_sk(vs->sock->sk)->inet_sport == port)
288 return vs;
289 }
290 return NULL;
291 }
292
293 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
294 {
295 struct vxlan_dev *vxlan;
296
297 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
298 if (vxlan->default_dst.remote_vni == id)
299 return vxlan;
300 }
301
302 return NULL;
303 }
304
305 /* Look up VNI in a per net namespace table */
306 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
307 {
308 struct vxlan_sock *vs;
309
310 vs = vxlan_find_sock(net, port);
311 if (!vs)
312 return NULL;
313
314 return vxlan_vs_find_vni(vs, id);
315 }
316
317 /* Fill in neighbour message in skbuff. */
318 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
319 const struct vxlan_fdb *fdb,
320 u32 portid, u32 seq, int type, unsigned int flags,
321 const struct vxlan_rdst *rdst)
322 {
323 unsigned long now = jiffies;
324 struct nda_cacheinfo ci;
325 struct nlmsghdr *nlh;
326 struct ndmsg *ndm;
327 bool send_ip, send_eth;
328
329 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
330 if (nlh == NULL)
331 return -EMSGSIZE;
332
333 ndm = nlmsg_data(nlh);
334 memset(ndm, 0, sizeof(*ndm));
335
336 send_eth = send_ip = true;
337
338 if (type == RTM_GETNEIGH) {
339 ndm->ndm_family = AF_INET;
340 send_ip = !vxlan_addr_any(&rdst->remote_ip);
341 send_eth = !is_zero_ether_addr(fdb->eth_addr);
342 } else
343 ndm->ndm_family = AF_BRIDGE;
344 ndm->ndm_state = fdb->state;
345 ndm->ndm_ifindex = vxlan->dev->ifindex;
346 ndm->ndm_flags = fdb->flags;
347 ndm->ndm_type = NDA_DST;
348
349 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
350 goto nla_put_failure;
351
352 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
353 goto nla_put_failure;
354
355 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
356 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
357 goto nla_put_failure;
358 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
359 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
360 goto nla_put_failure;
361 if (rdst->remote_ifindex &&
362 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
363 goto nla_put_failure;
364
365 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
366 ci.ndm_confirmed = 0;
367 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
368 ci.ndm_refcnt = 0;
369
370 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
371 goto nla_put_failure;
372
373 return nlmsg_end(skb, nlh);
374
375 nla_put_failure:
376 nlmsg_cancel(skb, nlh);
377 return -EMSGSIZE;
378 }
379
380 static inline size_t vxlan_nlmsg_size(void)
381 {
382 return NLMSG_ALIGN(sizeof(struct ndmsg))
383 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
384 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
385 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
386 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
387 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
388 + nla_total_size(sizeof(struct nda_cacheinfo));
389 }
390
391 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
392 struct vxlan_fdb *fdb, int type)
393 {
394 struct net *net = dev_net(vxlan->dev);
395 struct sk_buff *skb;
396 int err = -ENOBUFS;
397
398 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
399 if (skb == NULL)
400 goto errout;
401
402 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0,
403 first_remote_rtnl(fdb));
404 if (err < 0) {
405 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
406 WARN_ON(err == -EMSGSIZE);
407 kfree_skb(skb);
408 goto errout;
409 }
410
411 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
412 return;
413 errout:
414 if (err < 0)
415 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
416 }
417
418 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
419 {
420 struct vxlan_dev *vxlan = netdev_priv(dev);
421 struct vxlan_fdb f = {
422 .state = NUD_STALE,
423 };
424 struct vxlan_rdst remote = {
425 .remote_ip = *ipa, /* goes to NDA_DST */
426 .remote_vni = VXLAN_N_VID,
427 };
428
429 INIT_LIST_HEAD(&f.remotes);
430 list_add_rcu(&remote.list, &f.remotes);
431
432 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
433 }
434
435 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
436 {
437 struct vxlan_fdb f = {
438 .state = NUD_STALE,
439 };
440
441 INIT_LIST_HEAD(&f.remotes);
442 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
443
444 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
445 }
446
447 /* Hash Ethernet address */
448 static u32 eth_hash(const unsigned char *addr)
449 {
450 u64 value = get_unaligned((u64 *)addr);
451
452 /* only want 6 bytes */
453 #ifdef __BIG_ENDIAN
454 value >>= 16;
455 #else
456 value <<= 16;
457 #endif
458 return hash_64(value, FDB_HASH_BITS);
459 }
460
461 /* Hash chain to use given mac address */
462 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
463 const u8 *mac)
464 {
465 return &vxlan->fdb_head[eth_hash(mac)];
466 }
467
468 /* Look up Ethernet address in forwarding table */
469 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
470 const u8 *mac)
471
472 {
473 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
474 struct vxlan_fdb *f;
475
476 hlist_for_each_entry_rcu(f, head, hlist) {
477 if (ether_addr_equal(mac, f->eth_addr))
478 return f;
479 }
480
481 return NULL;
482 }
483
484 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
485 const u8 *mac)
486 {
487 struct vxlan_fdb *f;
488
489 f = __vxlan_find_mac(vxlan, mac);
490 if (f)
491 f->used = jiffies;
492
493 return f;
494 }
495
496 /* caller should hold vxlan->hash_lock */
497 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
498 union vxlan_addr *ip, __be16 port,
499 __u32 vni, __u32 ifindex)
500 {
501 struct vxlan_rdst *rd;
502
503 list_for_each_entry(rd, &f->remotes, list) {
504 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
505 rd->remote_port == port &&
506 rd->remote_vni == vni &&
507 rd->remote_ifindex == ifindex)
508 return rd;
509 }
510
511 return NULL;
512 }
513
514 /* Replace destination of unicast mac */
515 static int vxlan_fdb_replace(struct vxlan_fdb *f,
516 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
517 {
518 struct vxlan_rdst *rd;
519
520 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
521 if (rd)
522 return 0;
523
524 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
525 if (!rd)
526 return 0;
527 rd->remote_ip = *ip;
528 rd->remote_port = port;
529 rd->remote_vni = vni;
530 rd->remote_ifindex = ifindex;
531 return 1;
532 }
533
534 /* Add/update destinations for multicast */
535 static int vxlan_fdb_append(struct vxlan_fdb *f,
536 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
537 {
538 struct vxlan_rdst *rd;
539
540 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
541 if (rd)
542 return 0;
543
544 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
545 if (rd == NULL)
546 return -ENOBUFS;
547 rd->remote_ip = *ip;
548 rd->remote_port = port;
549 rd->remote_vni = vni;
550 rd->remote_ifindex = ifindex;
551
552 list_add_tail_rcu(&rd->list, &f->remotes);
553
554 return 1;
555 }
556
557 /* Notify netdevs that UDP port started listening */
558 static void vxlan_notify_add_rx_port(struct sock *sk)
559 {
560 struct net_device *dev;
561 struct net *net = sock_net(sk);
562 sa_family_t sa_family = sk->sk_family;
563 __be16 port = inet_sk(sk)->inet_sport;
564
565 rcu_read_lock();
566 for_each_netdev_rcu(net, dev) {
567 if (dev->netdev_ops->ndo_add_vxlan_port)
568 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
569 port);
570 }
571 rcu_read_unlock();
572 }
573
574 /* Notify netdevs that UDP port is no more listening */
575 static void vxlan_notify_del_rx_port(struct sock *sk)
576 {
577 struct net_device *dev;
578 struct net *net = sock_net(sk);
579 sa_family_t sa_family = sk->sk_family;
580 __be16 port = inet_sk(sk)->inet_sport;
581
582 rcu_read_lock();
583 for_each_netdev_rcu(net, dev) {
584 if (dev->netdev_ops->ndo_del_vxlan_port)
585 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
586 port);
587 }
588 rcu_read_unlock();
589 }
590
591 /* Add new entry to forwarding table -- assumes lock held */
592 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
593 const u8 *mac, union vxlan_addr *ip,
594 __u16 state, __u16 flags,
595 __be16 port, __u32 vni, __u32 ifindex,
596 __u8 ndm_flags)
597 {
598 struct vxlan_fdb *f;
599 int notify = 0;
600
601 f = __vxlan_find_mac(vxlan, mac);
602 if (f) {
603 if (flags & NLM_F_EXCL) {
604 netdev_dbg(vxlan->dev,
605 "lost race to create %pM\n", mac);
606 return -EEXIST;
607 }
608 if (f->state != state) {
609 f->state = state;
610 f->updated = jiffies;
611 notify = 1;
612 }
613 if (f->flags != ndm_flags) {
614 f->flags = ndm_flags;
615 f->updated = jiffies;
616 notify = 1;
617 }
618 if ((flags & NLM_F_REPLACE)) {
619 /* Only change unicasts */
620 if (!(is_multicast_ether_addr(f->eth_addr) ||
621 is_zero_ether_addr(f->eth_addr))) {
622 int rc = vxlan_fdb_replace(f, ip, port, vni,
623 ifindex);
624
625 if (rc < 0)
626 return rc;
627 notify |= rc;
628 } else
629 return -EOPNOTSUPP;
630 }
631 if ((flags & NLM_F_APPEND) &&
632 (is_multicast_ether_addr(f->eth_addr) ||
633 is_zero_ether_addr(f->eth_addr))) {
634 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
635
636 if (rc < 0)
637 return rc;
638 notify |= rc;
639 }
640 } else {
641 if (!(flags & NLM_F_CREATE))
642 return -ENOENT;
643
644 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
645 return -ENOSPC;
646
647 /* Disallow replace to add a multicast entry */
648 if ((flags & NLM_F_REPLACE) &&
649 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
650 return -EOPNOTSUPP;
651
652 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
653 f = kmalloc(sizeof(*f), GFP_ATOMIC);
654 if (!f)
655 return -ENOMEM;
656
657 notify = 1;
658 f->state = state;
659 f->flags = ndm_flags;
660 f->updated = f->used = jiffies;
661 INIT_LIST_HEAD(&f->remotes);
662 memcpy(f->eth_addr, mac, ETH_ALEN);
663
664 vxlan_fdb_append(f, ip, port, vni, ifindex);
665
666 ++vxlan->addrcnt;
667 hlist_add_head_rcu(&f->hlist,
668 vxlan_fdb_head(vxlan, mac));
669 }
670
671 if (notify)
672 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
673
674 return 0;
675 }
676
677 static void vxlan_fdb_free(struct rcu_head *head)
678 {
679 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
680 struct vxlan_rdst *rd, *nd;
681
682 list_for_each_entry_safe(rd, nd, &f->remotes, list)
683 kfree(rd);
684 kfree(f);
685 }
686
687 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
688 {
689 netdev_dbg(vxlan->dev,
690 "delete %pM\n", f->eth_addr);
691
692 --vxlan->addrcnt;
693 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
694
695 hlist_del_rcu(&f->hlist);
696 call_rcu(&f->rcu, vxlan_fdb_free);
697 }
698
699 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
700 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
701 {
702 struct net *net = dev_net(vxlan->dev);
703 int err;
704
705 if (tb[NDA_DST]) {
706 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
707 if (err)
708 return err;
709 } else {
710 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
711 if (remote->sa.sa_family == AF_INET) {
712 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
713 ip->sa.sa_family = AF_INET;
714 #if IS_ENABLED(CONFIG_IPV6)
715 } else {
716 ip->sin6.sin6_addr = in6addr_any;
717 ip->sa.sa_family = AF_INET6;
718 #endif
719 }
720 }
721
722 if (tb[NDA_PORT]) {
723 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
724 return -EINVAL;
725 *port = nla_get_be16(tb[NDA_PORT]);
726 } else {
727 *port = vxlan->dst_port;
728 }
729
730 if (tb[NDA_VNI]) {
731 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
732 return -EINVAL;
733 *vni = nla_get_u32(tb[NDA_VNI]);
734 } else {
735 *vni = vxlan->default_dst.remote_vni;
736 }
737
738 if (tb[NDA_IFINDEX]) {
739 struct net_device *tdev;
740
741 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
742 return -EINVAL;
743 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
744 tdev = __dev_get_by_index(net, *ifindex);
745 if (!tdev)
746 return -EADDRNOTAVAIL;
747 } else {
748 *ifindex = 0;
749 }
750
751 return 0;
752 }
753
754 /* Add static entry (via netlink) */
755 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
756 struct net_device *dev,
757 const unsigned char *addr, u16 flags)
758 {
759 struct vxlan_dev *vxlan = netdev_priv(dev);
760 /* struct net *net = dev_net(vxlan->dev); */
761 union vxlan_addr ip;
762 __be16 port;
763 u32 vni, ifindex;
764 int err;
765
766 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
767 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
768 ndm->ndm_state);
769 return -EINVAL;
770 }
771
772 if (tb[NDA_DST] == NULL)
773 return -EINVAL;
774
775 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
776 if (err)
777 return err;
778
779 spin_lock_bh(&vxlan->hash_lock);
780 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
781 port, vni, ifindex, ndm->ndm_flags);
782 spin_unlock_bh(&vxlan->hash_lock);
783
784 return err;
785 }
786
787 /* Delete entry (via netlink) */
788 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
789 struct net_device *dev,
790 const unsigned char *addr)
791 {
792 struct vxlan_dev *vxlan = netdev_priv(dev);
793 struct vxlan_fdb *f;
794 struct vxlan_rdst *rd = NULL;
795 union vxlan_addr ip;
796 __be16 port;
797 u32 vni, ifindex;
798 int err;
799
800 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
801 if (err)
802 return err;
803
804 err = -ENOENT;
805
806 spin_lock_bh(&vxlan->hash_lock);
807 f = vxlan_find_mac(vxlan, addr);
808 if (!f)
809 goto out;
810
811 if (!vxlan_addr_any(&ip)) {
812 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
813 if (!rd)
814 goto out;
815 }
816
817 err = 0;
818
819 /* remove a destination if it's not the only one on the list,
820 * otherwise destroy the fdb entry
821 */
822 if (rd && !list_is_singular(&f->remotes)) {
823 list_del_rcu(&rd->list);
824 kfree_rcu(rd, rcu);
825 goto out;
826 }
827
828 vxlan_fdb_destroy(vxlan, f);
829
830 out:
831 spin_unlock_bh(&vxlan->hash_lock);
832
833 return err;
834 }
835
836 /* Dump forwarding table */
837 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
838 struct net_device *dev, int idx)
839 {
840 struct vxlan_dev *vxlan = netdev_priv(dev);
841 unsigned int h;
842
843 for (h = 0; h < FDB_HASH_SIZE; ++h) {
844 struct vxlan_fdb *f;
845 int err;
846
847 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
848 struct vxlan_rdst *rd;
849
850 if (idx < cb->args[0])
851 goto skip;
852
853 list_for_each_entry_rcu(rd, &f->remotes, list) {
854 err = vxlan_fdb_info(skb, vxlan, f,
855 NETLINK_CB(cb->skb).portid,
856 cb->nlh->nlmsg_seq,
857 RTM_NEWNEIGH,
858 NLM_F_MULTI, rd);
859 if (err < 0)
860 goto out;
861 }
862 skip:
863 ++idx;
864 }
865 }
866 out:
867 return idx;
868 }
869
870 /* Watch incoming packets to learn mapping between Ethernet address
871 * and Tunnel endpoint.
872 * Return true if packet is bogus and should be droppped.
873 */
874 static bool vxlan_snoop(struct net_device *dev,
875 union vxlan_addr *src_ip, const u8 *src_mac)
876 {
877 struct vxlan_dev *vxlan = netdev_priv(dev);
878 struct vxlan_fdb *f;
879
880 f = vxlan_find_mac(vxlan, src_mac);
881 if (likely(f)) {
882 struct vxlan_rdst *rdst = first_remote_rcu(f);
883
884 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
885 return false;
886
887 /* Don't migrate static entries, drop packets */
888 if (f->state & NUD_NOARP)
889 return true;
890
891 if (net_ratelimit())
892 netdev_info(dev,
893 "%pM migrated from %pIS to %pIS\n",
894 src_mac, &rdst->remote_ip, &src_ip);
895
896 rdst->remote_ip = *src_ip;
897 f->updated = jiffies;
898 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
899 } else {
900 /* learned new entry */
901 spin_lock(&vxlan->hash_lock);
902
903 /* close off race between vxlan_flush and incoming packets */
904 if (netif_running(dev))
905 vxlan_fdb_create(vxlan, src_mac, src_ip,
906 NUD_REACHABLE,
907 NLM_F_EXCL|NLM_F_CREATE,
908 vxlan->dst_port,
909 vxlan->default_dst.remote_vni,
910 0, NTF_SELF);
911 spin_unlock(&vxlan->hash_lock);
912 }
913
914 return false;
915 }
916
917 /* See if multicast group is already in use by other ID */
918 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
919 {
920 struct vxlan_dev *vxlan;
921
922 /* The vxlan_sock is only used by dev, leaving group has
923 * no effect on other vxlan devices.
924 */
925 if (atomic_read(&dev->vn_sock->refcnt) == 1)
926 return false;
927
928 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
929 if (!netif_running(vxlan->dev) || vxlan == dev)
930 continue;
931
932 if (vxlan->vn_sock != dev->vn_sock)
933 continue;
934
935 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
936 &dev->default_dst.remote_ip))
937 continue;
938
939 if (vxlan->default_dst.remote_ifindex !=
940 dev->default_dst.remote_ifindex)
941 continue;
942
943 return true;
944 }
945
946 return false;
947 }
948
949 static void vxlan_sock_hold(struct vxlan_sock *vs)
950 {
951 atomic_inc(&vs->refcnt);
952 }
953
954 void vxlan_sock_release(struct vxlan_sock *vs)
955 {
956 struct sock *sk = vs->sock->sk;
957 struct net *net = sock_net(sk);
958 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
959
960 if (!atomic_dec_and_test(&vs->refcnt))
961 return;
962
963 spin_lock(&vn->sock_lock);
964 hlist_del_rcu(&vs->hlist);
965 rcu_assign_sk_user_data(vs->sock->sk, NULL);
966 vxlan_notify_del_rx_port(sk);
967 spin_unlock(&vn->sock_lock);
968
969 queue_work(vxlan_wq, &vs->del_work);
970 }
971 EXPORT_SYMBOL_GPL(vxlan_sock_release);
972
973 /* Callback to update multicast group membership when first VNI on
974 * multicast asddress is brought up
975 * Done as workqueue because ip_mc_join_group acquires RTNL.
976 */
977 static void vxlan_igmp_join(struct work_struct *work)
978 {
979 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
980 struct vxlan_sock *vs = vxlan->vn_sock;
981 struct sock *sk = vs->sock->sk;
982 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
983 int ifindex = vxlan->default_dst.remote_ifindex;
984
985 lock_sock(sk);
986 if (ip->sa.sa_family == AF_INET) {
987 struct ip_mreqn mreq = {
988 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
989 .imr_ifindex = ifindex,
990 };
991
992 ip_mc_join_group(sk, &mreq);
993 #if IS_ENABLED(CONFIG_IPV6)
994 } else {
995 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
996 &ip->sin6.sin6_addr);
997 #endif
998 }
999 release_sock(sk);
1000
1001 vxlan_sock_release(vs);
1002 dev_put(vxlan->dev);
1003 }
1004
1005 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1006 static void vxlan_igmp_leave(struct work_struct *work)
1007 {
1008 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1009 struct vxlan_sock *vs = vxlan->vn_sock;
1010 struct sock *sk = vs->sock->sk;
1011 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1012 int ifindex = vxlan->default_dst.remote_ifindex;
1013
1014 lock_sock(sk);
1015 if (ip->sa.sa_family == AF_INET) {
1016 struct ip_mreqn mreq = {
1017 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1018 .imr_ifindex = ifindex,
1019 };
1020
1021 ip_mc_leave_group(sk, &mreq);
1022 #if IS_ENABLED(CONFIG_IPV6)
1023 } else {
1024 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1025 &ip->sin6.sin6_addr);
1026 #endif
1027 }
1028
1029 release_sock(sk);
1030
1031 vxlan_sock_release(vs);
1032 dev_put(vxlan->dev);
1033 }
1034
1035 /* Callback from net/ipv4/udp.c to receive packets */
1036 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1037 {
1038 struct vxlan_sock *vs;
1039 struct vxlanhdr *vxh;
1040 __be16 port;
1041
1042 /* Need Vxlan and inner Ethernet header to be present */
1043 if (!pskb_may_pull(skb, VXLAN_HLEN))
1044 goto error;
1045
1046 /* Return packets with reserved bits set */
1047 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1048 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1049 (vxh->vx_vni & htonl(0xff))) {
1050 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1051 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1052 goto error;
1053 }
1054
1055 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1056 goto drop;
1057
1058 port = inet_sk(sk)->inet_sport;
1059
1060 vs = rcu_dereference_sk_user_data(sk);
1061 if (!vs)
1062 goto drop;
1063
1064 vs->rcv(vs, skb, vxh->vx_vni);
1065 return 0;
1066
1067 drop:
1068 /* Consume bad packet */
1069 kfree_skb(skb);
1070 return 0;
1071
1072 error:
1073 /* Return non vxlan pkt */
1074 return 1;
1075 }
1076
1077 static void vxlan_rcv(struct vxlan_sock *vs,
1078 struct sk_buff *skb, __be32 vx_vni)
1079 {
1080 struct iphdr *oip = NULL;
1081 struct ipv6hdr *oip6 = NULL;
1082 struct vxlan_dev *vxlan;
1083 struct pcpu_sw_netstats *stats;
1084 union vxlan_addr saddr;
1085 __u32 vni;
1086 int err = 0;
1087 union vxlan_addr *remote_ip;
1088
1089 vni = ntohl(vx_vni) >> 8;
1090 /* Is this VNI defined? */
1091 vxlan = vxlan_vs_find_vni(vs, vni);
1092 if (!vxlan)
1093 goto drop;
1094
1095 remote_ip = &vxlan->default_dst.remote_ip;
1096 skb_reset_mac_header(skb);
1097 skb->protocol = eth_type_trans(skb, vxlan->dev);
1098
1099 /* Ignore packet loops (and multicast echo) */
1100 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1101 goto drop;
1102
1103 /* Re-examine inner Ethernet packet */
1104 if (remote_ip->sa.sa_family == AF_INET) {
1105 oip = ip_hdr(skb);
1106 saddr.sin.sin_addr.s_addr = oip->saddr;
1107 saddr.sa.sa_family = AF_INET;
1108 #if IS_ENABLED(CONFIG_IPV6)
1109 } else {
1110 oip6 = ipv6_hdr(skb);
1111 saddr.sin6.sin6_addr = oip6->saddr;
1112 saddr.sa.sa_family = AF_INET6;
1113 #endif
1114 }
1115
1116 if ((vxlan->flags & VXLAN_F_LEARN) &&
1117 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1118 goto drop;
1119
1120 skb_reset_network_header(skb);
1121
1122 /* If the NIC driver gave us an encapsulated packet with
1123 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
1124 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
1125 * for us. Otherwise force the upper layers to verify it.
1126 */
1127 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
1128 !(vxlan->dev->features & NETIF_F_RXCSUM))
1129 skb->ip_summed = CHECKSUM_NONE;
1130
1131 skb->encapsulation = 0;
1132
1133 if (oip6)
1134 err = IP6_ECN_decapsulate(oip6, skb);
1135 if (oip)
1136 err = IP_ECN_decapsulate(oip, skb);
1137
1138 if (unlikely(err)) {
1139 if (log_ecn_error) {
1140 if (oip6)
1141 net_info_ratelimited("non-ECT from %pI6\n",
1142 &oip6->saddr);
1143 if (oip)
1144 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1145 &oip->saddr, oip->tos);
1146 }
1147 if (err > 1) {
1148 ++vxlan->dev->stats.rx_frame_errors;
1149 ++vxlan->dev->stats.rx_errors;
1150 goto drop;
1151 }
1152 }
1153
1154 stats = this_cpu_ptr(vxlan->dev->tstats);
1155 u64_stats_update_begin(&stats->syncp);
1156 stats->rx_packets++;
1157 stats->rx_bytes += skb->len;
1158 u64_stats_update_end(&stats->syncp);
1159
1160 netif_rx(skb);
1161
1162 return;
1163 drop:
1164 /* Consume bad packet */
1165 kfree_skb(skb);
1166 }
1167
1168 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1169 {
1170 struct vxlan_dev *vxlan = netdev_priv(dev);
1171 struct arphdr *parp;
1172 u8 *arpptr, *sha;
1173 __be32 sip, tip;
1174 struct neighbour *n;
1175
1176 if (dev->flags & IFF_NOARP)
1177 goto out;
1178
1179 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1180 dev->stats.tx_dropped++;
1181 goto out;
1182 }
1183 parp = arp_hdr(skb);
1184
1185 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1186 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1187 parp->ar_pro != htons(ETH_P_IP) ||
1188 parp->ar_op != htons(ARPOP_REQUEST) ||
1189 parp->ar_hln != dev->addr_len ||
1190 parp->ar_pln != 4)
1191 goto out;
1192 arpptr = (u8 *)parp + sizeof(struct arphdr);
1193 sha = arpptr;
1194 arpptr += dev->addr_len; /* sha */
1195 memcpy(&sip, arpptr, sizeof(sip));
1196 arpptr += sizeof(sip);
1197 arpptr += dev->addr_len; /* tha */
1198 memcpy(&tip, arpptr, sizeof(tip));
1199
1200 if (ipv4_is_loopback(tip) ||
1201 ipv4_is_multicast(tip))
1202 goto out;
1203
1204 n = neigh_lookup(&arp_tbl, &tip, dev);
1205
1206 if (n) {
1207 struct vxlan_fdb *f;
1208 struct sk_buff *reply;
1209
1210 if (!(n->nud_state & NUD_CONNECTED)) {
1211 neigh_release(n);
1212 goto out;
1213 }
1214
1215 f = vxlan_find_mac(vxlan, n->ha);
1216 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1217 /* bridge-local neighbor */
1218 neigh_release(n);
1219 goto out;
1220 }
1221
1222 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1223 n->ha, sha);
1224
1225 neigh_release(n);
1226
1227 skb_reset_mac_header(reply);
1228 __skb_pull(reply, skb_network_offset(reply));
1229 reply->ip_summed = CHECKSUM_UNNECESSARY;
1230 reply->pkt_type = PACKET_HOST;
1231
1232 if (netif_rx_ni(reply) == NET_RX_DROP)
1233 dev->stats.rx_dropped++;
1234 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1235 union vxlan_addr ipa = {
1236 .sin.sin_addr.s_addr = tip,
1237 .sa.sa_family = AF_INET,
1238 };
1239
1240 vxlan_ip_miss(dev, &ipa);
1241 }
1242 out:
1243 consume_skb(skb);
1244 return NETDEV_TX_OK;
1245 }
1246
1247 #if IS_ENABLED(CONFIG_IPV6)
1248 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1249 {
1250 struct vxlan_dev *vxlan = netdev_priv(dev);
1251 struct neighbour *n;
1252 union vxlan_addr ipa;
1253 const struct ipv6hdr *iphdr;
1254 const struct in6_addr *saddr, *daddr;
1255 struct nd_msg *msg;
1256 struct inet6_dev *in6_dev = NULL;
1257
1258 in6_dev = __in6_dev_get(dev);
1259 if (!in6_dev)
1260 goto out;
1261
1262 if (!pskb_may_pull(skb, skb->len))
1263 goto out;
1264
1265 iphdr = ipv6_hdr(skb);
1266 saddr = &iphdr->saddr;
1267 daddr = &iphdr->daddr;
1268
1269 if (ipv6_addr_loopback(daddr) ||
1270 ipv6_addr_is_multicast(daddr))
1271 goto out;
1272
1273 msg = (struct nd_msg *)skb_transport_header(skb);
1274 if (msg->icmph.icmp6_code != 0 ||
1275 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1276 goto out;
1277
1278 n = neigh_lookup(ipv6_stub->nd_tbl, daddr, dev);
1279
1280 if (n) {
1281 struct vxlan_fdb *f;
1282
1283 if (!(n->nud_state & NUD_CONNECTED)) {
1284 neigh_release(n);
1285 goto out;
1286 }
1287
1288 f = vxlan_find_mac(vxlan, n->ha);
1289 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1290 /* bridge-local neighbor */
1291 neigh_release(n);
1292 goto out;
1293 }
1294
1295 ipv6_stub->ndisc_send_na(dev, n, saddr, &msg->target,
1296 !!in6_dev->cnf.forwarding,
1297 true, false, false);
1298 neigh_release(n);
1299 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1300 ipa.sin6.sin6_addr = *daddr;
1301 ipa.sa.sa_family = AF_INET6;
1302 vxlan_ip_miss(dev, &ipa);
1303 }
1304
1305 out:
1306 consume_skb(skb);
1307 return NETDEV_TX_OK;
1308 }
1309 #endif
1310
1311 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1312 {
1313 struct vxlan_dev *vxlan = netdev_priv(dev);
1314 struct neighbour *n;
1315
1316 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1317 return false;
1318
1319 n = NULL;
1320 switch (ntohs(eth_hdr(skb)->h_proto)) {
1321 case ETH_P_IP:
1322 {
1323 struct iphdr *pip;
1324
1325 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1326 return false;
1327 pip = ip_hdr(skb);
1328 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1329 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1330 union vxlan_addr ipa = {
1331 .sin.sin_addr.s_addr = pip->daddr,
1332 .sa.sa_family = AF_INET,
1333 };
1334
1335 vxlan_ip_miss(dev, &ipa);
1336 return false;
1337 }
1338
1339 break;
1340 }
1341 #if IS_ENABLED(CONFIG_IPV6)
1342 case ETH_P_IPV6:
1343 {
1344 struct ipv6hdr *pip6;
1345
1346 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1347 return false;
1348 pip6 = ipv6_hdr(skb);
1349 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1350 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1351 union vxlan_addr ipa = {
1352 .sin6.sin6_addr = pip6->daddr,
1353 .sa.sa_family = AF_INET6,
1354 };
1355
1356 vxlan_ip_miss(dev, &ipa);
1357 return false;
1358 }
1359
1360 break;
1361 }
1362 #endif
1363 default:
1364 return false;
1365 }
1366
1367 if (n) {
1368 bool diff;
1369
1370 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1371 if (diff) {
1372 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1373 dev->addr_len);
1374 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1375 }
1376 neigh_release(n);
1377 return diff;
1378 }
1379
1380 return false;
1381 }
1382
1383 /* Compute source port for outgoing packet
1384 * first choice to use L4 flow hash since it will spread
1385 * better and maybe available from hardware
1386 * secondary choice is to use jhash on the Ethernet header
1387 */
1388 __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1389 {
1390 unsigned int range = (port_max - port_min) + 1;
1391 u32 hash;
1392
1393 hash = skb_get_hash(skb);
1394 if (!hash)
1395 hash = jhash(skb->data, 2 * ETH_ALEN,
1396 (__force u32) skb->protocol);
1397
1398 return htons((((u64) hash * range) >> 32) + port_min);
1399 }
1400 EXPORT_SYMBOL_GPL(vxlan_src_port);
1401
1402 static int handle_offloads(struct sk_buff *skb)
1403 {
1404 if (skb_is_gso(skb)) {
1405 int err = skb_unclone(skb, GFP_ATOMIC);
1406 if (unlikely(err))
1407 return err;
1408
1409 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1410 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1411 skb->ip_summed = CHECKSUM_NONE;
1412
1413 return 0;
1414 }
1415
1416 #if IS_ENABLED(CONFIG_IPV6)
1417 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1418 struct dst_entry *dst, struct sk_buff *skb,
1419 struct net_device *dev, struct in6_addr *saddr,
1420 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1421 __be16 src_port, __be16 dst_port, __be32 vni)
1422 {
1423 struct ipv6hdr *ip6h;
1424 struct vxlanhdr *vxh;
1425 struct udphdr *uh;
1426 int min_headroom;
1427 int err;
1428
1429 if (!skb->encapsulation) {
1430 skb_reset_inner_headers(skb);
1431 skb->encapsulation = 1;
1432 }
1433
1434 skb_scrub_packet(skb, false);
1435
1436 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1437 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1438 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1439
1440 /* Need space for new headers (invalidates iph ptr) */
1441 err = skb_cow_head(skb, min_headroom);
1442 if (unlikely(err))
1443 return err;
1444
1445 if (vlan_tx_tag_present(skb)) {
1446 if (WARN_ON(!__vlan_put_tag(skb,
1447 skb->vlan_proto,
1448 vlan_tx_tag_get(skb))))
1449 return -ENOMEM;
1450
1451 skb->vlan_tci = 0;
1452 }
1453
1454 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1455 vxh->vx_flags = htonl(VXLAN_FLAGS);
1456 vxh->vx_vni = vni;
1457
1458 __skb_push(skb, sizeof(*uh));
1459 skb_reset_transport_header(skb);
1460 uh = udp_hdr(skb);
1461
1462 uh->dest = dst_port;
1463 uh->source = src_port;
1464
1465 uh->len = htons(skb->len);
1466 uh->check = 0;
1467
1468 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1469 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1470 IPSKB_REROUTED);
1471 skb_dst_set(skb, dst);
1472
1473 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1474 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1475 skb->ip_summed = CHECKSUM_UNNECESSARY;
1476 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1477 IPPROTO_UDP, csum);
1478 if (uh->check == 0)
1479 uh->check = CSUM_MANGLED_0;
1480 } else {
1481 skb->ip_summed = CHECKSUM_PARTIAL;
1482 skb->csum_start = skb_transport_header(skb) - skb->head;
1483 skb->csum_offset = offsetof(struct udphdr, check);
1484 uh->check = ~csum_ipv6_magic(saddr, daddr,
1485 skb->len, IPPROTO_UDP, 0);
1486 }
1487
1488 __skb_push(skb, sizeof(*ip6h));
1489 skb_reset_network_header(skb);
1490 ip6h = ipv6_hdr(skb);
1491 ip6h->version = 6;
1492 ip6h->priority = prio;
1493 ip6h->flow_lbl[0] = 0;
1494 ip6h->flow_lbl[1] = 0;
1495 ip6h->flow_lbl[2] = 0;
1496 ip6h->payload_len = htons(skb->len);
1497 ip6h->nexthdr = IPPROTO_UDP;
1498 ip6h->hop_limit = ttl;
1499 ip6h->daddr = *daddr;
1500 ip6h->saddr = *saddr;
1501
1502 err = handle_offloads(skb);
1503 if (err)
1504 return err;
1505
1506 ip6tunnel_xmit(skb, dev);
1507 return 0;
1508 }
1509 #endif
1510
1511 int vxlan_xmit_skb(struct vxlan_sock *vs,
1512 struct rtable *rt, struct sk_buff *skb,
1513 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1514 __be16 src_port, __be16 dst_port, __be32 vni)
1515 {
1516 struct vxlanhdr *vxh;
1517 struct udphdr *uh;
1518 int min_headroom;
1519 int err;
1520
1521 if (!skb->encapsulation) {
1522 skb_reset_inner_headers(skb);
1523 skb->encapsulation = 1;
1524 }
1525
1526 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1527 + VXLAN_HLEN + sizeof(struct iphdr)
1528 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1529
1530 /* Need space for new headers (invalidates iph ptr) */
1531 err = skb_cow_head(skb, min_headroom);
1532 if (unlikely(err))
1533 return err;
1534
1535 if (vlan_tx_tag_present(skb)) {
1536 if (WARN_ON(!__vlan_put_tag(skb,
1537 skb->vlan_proto,
1538 vlan_tx_tag_get(skb))))
1539 return -ENOMEM;
1540
1541 skb->vlan_tci = 0;
1542 }
1543
1544 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1545 vxh->vx_flags = htonl(VXLAN_FLAGS);
1546 vxh->vx_vni = vni;
1547
1548 __skb_push(skb, sizeof(*uh));
1549 skb_reset_transport_header(skb);
1550 uh = udp_hdr(skb);
1551
1552 uh->dest = dst_port;
1553 uh->source = src_port;
1554
1555 uh->len = htons(skb->len);
1556 uh->check = 0;
1557
1558 err = handle_offloads(skb);
1559 if (err)
1560 return err;
1561
1562 return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
1563 false);
1564 }
1565 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1566
1567 /* Bypass encapsulation if the destination is local */
1568 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1569 struct vxlan_dev *dst_vxlan)
1570 {
1571 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1572 union vxlan_addr loopback;
1573 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1574
1575 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1576 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1577 skb->pkt_type = PACKET_HOST;
1578 skb->encapsulation = 0;
1579 skb->dev = dst_vxlan->dev;
1580 __skb_pull(skb, skb_network_offset(skb));
1581
1582 if (remote_ip->sa.sa_family == AF_INET) {
1583 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1584 loopback.sa.sa_family = AF_INET;
1585 #if IS_ENABLED(CONFIG_IPV6)
1586 } else {
1587 loopback.sin6.sin6_addr = in6addr_loopback;
1588 loopback.sa.sa_family = AF_INET6;
1589 #endif
1590 }
1591
1592 if (dst_vxlan->flags & VXLAN_F_LEARN)
1593 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1594
1595 u64_stats_update_begin(&tx_stats->syncp);
1596 tx_stats->tx_packets++;
1597 tx_stats->tx_bytes += skb->len;
1598 u64_stats_update_end(&tx_stats->syncp);
1599
1600 if (netif_rx(skb) == NET_RX_SUCCESS) {
1601 u64_stats_update_begin(&rx_stats->syncp);
1602 rx_stats->rx_packets++;
1603 rx_stats->rx_bytes += skb->len;
1604 u64_stats_update_end(&rx_stats->syncp);
1605 } else {
1606 skb->dev->stats.rx_dropped++;
1607 }
1608 }
1609
1610 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1611 struct vxlan_rdst *rdst, bool did_rsc)
1612 {
1613 struct vxlan_dev *vxlan = netdev_priv(dev);
1614 struct rtable *rt = NULL;
1615 const struct iphdr *old_iph;
1616 struct flowi4 fl4;
1617 union vxlan_addr *dst;
1618 __be16 src_port = 0, dst_port;
1619 u32 vni;
1620 __be16 df = 0;
1621 __u8 tos, ttl;
1622 int err;
1623
1624 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1625 vni = rdst->remote_vni;
1626 dst = &rdst->remote_ip;
1627
1628 if (vxlan_addr_any(dst)) {
1629 if (did_rsc) {
1630 /* short-circuited back to local bridge */
1631 vxlan_encap_bypass(skb, vxlan, vxlan);
1632 return;
1633 }
1634 goto drop;
1635 }
1636
1637 old_iph = ip_hdr(skb);
1638
1639 ttl = vxlan->ttl;
1640 if (!ttl && vxlan_addr_multicast(dst))
1641 ttl = 1;
1642
1643 tos = vxlan->tos;
1644 if (tos == 1)
1645 tos = ip_tunnel_get_dsfield(old_iph, skb);
1646
1647 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1648
1649 if (dst->sa.sa_family == AF_INET) {
1650 memset(&fl4, 0, sizeof(fl4));
1651 fl4.flowi4_oif = rdst->remote_ifindex;
1652 fl4.flowi4_tos = RT_TOS(tos);
1653 fl4.daddr = dst->sin.sin_addr.s_addr;
1654 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1655
1656 rt = ip_route_output_key(dev_net(dev), &fl4);
1657 if (IS_ERR(rt)) {
1658 netdev_dbg(dev, "no route to %pI4\n",
1659 &dst->sin.sin_addr.s_addr);
1660 dev->stats.tx_carrier_errors++;
1661 goto tx_error;
1662 }
1663
1664 if (rt->dst.dev == dev) {
1665 netdev_dbg(dev, "circular route to %pI4\n",
1666 &dst->sin.sin_addr.s_addr);
1667 dev->stats.collisions++;
1668 goto rt_tx_error;
1669 }
1670
1671 /* Bypass encapsulation if the destination is local */
1672 if (rt->rt_flags & RTCF_LOCAL &&
1673 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1674 struct vxlan_dev *dst_vxlan;
1675
1676 ip_rt_put(rt);
1677 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1678 if (!dst_vxlan)
1679 goto tx_error;
1680 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1681 return;
1682 }
1683
1684 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1685 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1686
1687 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1688 fl4.saddr, dst->sin.sin_addr.s_addr,
1689 tos, ttl, df, src_port, dst_port,
1690 htonl(vni << 8));
1691
1692 if (err < 0)
1693 goto rt_tx_error;
1694 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1695 #if IS_ENABLED(CONFIG_IPV6)
1696 } else {
1697 struct sock *sk = vxlan->vn_sock->sock->sk;
1698 struct dst_entry *ndst;
1699 struct flowi6 fl6;
1700 u32 flags;
1701
1702 memset(&fl6, 0, sizeof(fl6));
1703 fl6.flowi6_oif = rdst->remote_ifindex;
1704 fl6.daddr = dst->sin6.sin6_addr;
1705 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1706 fl6.flowi6_proto = IPPROTO_UDP;
1707
1708 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1709 netdev_dbg(dev, "no route to %pI6\n",
1710 &dst->sin6.sin6_addr);
1711 dev->stats.tx_carrier_errors++;
1712 goto tx_error;
1713 }
1714
1715 if (ndst->dev == dev) {
1716 netdev_dbg(dev, "circular route to %pI6\n",
1717 &dst->sin6.sin6_addr);
1718 dst_release(ndst);
1719 dev->stats.collisions++;
1720 goto tx_error;
1721 }
1722
1723 /* Bypass encapsulation if the destination is local */
1724 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1725 if (flags & RTF_LOCAL &&
1726 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1727 struct vxlan_dev *dst_vxlan;
1728
1729 dst_release(ndst);
1730 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1731 if (!dst_vxlan)
1732 goto tx_error;
1733 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1734 return;
1735 }
1736
1737 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1738
1739 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1740 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1741 src_port, dst_port, htonl(vni << 8));
1742 #endif
1743 }
1744
1745 return;
1746
1747 drop:
1748 dev->stats.tx_dropped++;
1749 goto tx_free;
1750
1751 rt_tx_error:
1752 ip_rt_put(rt);
1753 tx_error:
1754 dev->stats.tx_errors++;
1755 tx_free:
1756 dev_kfree_skb(skb);
1757 }
1758
1759 /* Transmit local packets over Vxlan
1760 *
1761 * Outer IP header inherits ECN and DF from inner header.
1762 * Outer UDP destination is the VXLAN assigned port.
1763 * source port is based on hash of flow
1764 */
1765 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1766 {
1767 struct vxlan_dev *vxlan = netdev_priv(dev);
1768 struct ethhdr *eth;
1769 bool did_rsc = false;
1770 struct vxlan_rdst *rdst, *fdst = NULL;
1771 struct vxlan_fdb *f;
1772
1773 skb_reset_mac_header(skb);
1774 eth = eth_hdr(skb);
1775
1776 if ((vxlan->flags & VXLAN_F_PROXY)) {
1777 if (ntohs(eth->h_proto) == ETH_P_ARP)
1778 return arp_reduce(dev, skb);
1779 #if IS_ENABLED(CONFIG_IPV6)
1780 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1781 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1782 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1783 struct nd_msg *msg;
1784
1785 msg = (struct nd_msg *)skb_transport_header(skb);
1786 if (msg->icmph.icmp6_code == 0 &&
1787 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1788 return neigh_reduce(dev, skb);
1789 }
1790 #endif
1791 }
1792
1793 f = vxlan_find_mac(vxlan, eth->h_dest);
1794 did_rsc = false;
1795
1796 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1797 (ntohs(eth->h_proto) == ETH_P_IP ||
1798 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1799 did_rsc = route_shortcircuit(dev, skb);
1800 if (did_rsc)
1801 f = vxlan_find_mac(vxlan, eth->h_dest);
1802 }
1803
1804 if (f == NULL) {
1805 f = vxlan_find_mac(vxlan, all_zeros_mac);
1806 if (f == NULL) {
1807 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1808 !is_multicast_ether_addr(eth->h_dest))
1809 vxlan_fdb_miss(vxlan, eth->h_dest);
1810
1811 dev->stats.tx_dropped++;
1812 kfree_skb(skb);
1813 return NETDEV_TX_OK;
1814 }
1815 }
1816
1817 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1818 struct sk_buff *skb1;
1819
1820 if (!fdst) {
1821 fdst = rdst;
1822 continue;
1823 }
1824 skb1 = skb_clone(skb, GFP_ATOMIC);
1825 if (skb1)
1826 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1827 }
1828
1829 if (fdst)
1830 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1831 else
1832 kfree_skb(skb);
1833 return NETDEV_TX_OK;
1834 }
1835
1836 /* Walk the forwarding table and purge stale entries */
1837 static void vxlan_cleanup(unsigned long arg)
1838 {
1839 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1840 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1841 unsigned int h;
1842
1843 if (!netif_running(vxlan->dev))
1844 return;
1845
1846 spin_lock_bh(&vxlan->hash_lock);
1847 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1848 struct hlist_node *p, *n;
1849 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1850 struct vxlan_fdb *f
1851 = container_of(p, struct vxlan_fdb, hlist);
1852 unsigned long timeout;
1853
1854 if (f->state & NUD_PERMANENT)
1855 continue;
1856
1857 timeout = f->used + vxlan->age_interval * HZ;
1858 if (time_before_eq(timeout, jiffies)) {
1859 netdev_dbg(vxlan->dev,
1860 "garbage collect %pM\n",
1861 f->eth_addr);
1862 f->state = NUD_STALE;
1863 vxlan_fdb_destroy(vxlan, f);
1864 } else if (time_before(timeout, next_timer))
1865 next_timer = timeout;
1866 }
1867 }
1868 spin_unlock_bh(&vxlan->hash_lock);
1869
1870 mod_timer(&vxlan->age_timer, next_timer);
1871 }
1872
1873 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1874 {
1875 __u32 vni = vxlan->default_dst.remote_vni;
1876
1877 vxlan->vn_sock = vs;
1878 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1879 }
1880
1881 /* Setup stats when device is created */
1882 static int vxlan_init(struct net_device *dev)
1883 {
1884 struct vxlan_dev *vxlan = netdev_priv(dev);
1885 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1886 struct vxlan_sock *vs;
1887 int i;
1888
1889 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1890 if (!dev->tstats)
1891 return -ENOMEM;
1892
1893 for_each_possible_cpu(i) {
1894 struct pcpu_sw_netstats *vxlan_stats;
1895 vxlan_stats = per_cpu_ptr(dev->tstats, i);
1896 u64_stats_init(&vxlan_stats->syncp);
1897 }
1898
1899
1900 spin_lock(&vn->sock_lock);
1901 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
1902 if (vs) {
1903 /* If we have a socket with same port already, reuse it */
1904 atomic_inc(&vs->refcnt);
1905 vxlan_vs_add_dev(vs, vxlan);
1906 } else {
1907 /* otherwise make new socket outside of RTNL */
1908 dev_hold(dev);
1909 queue_work(vxlan_wq, &vxlan->sock_work);
1910 }
1911 spin_unlock(&vn->sock_lock);
1912
1913 return 0;
1914 }
1915
1916 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
1917 {
1918 struct vxlan_fdb *f;
1919
1920 spin_lock_bh(&vxlan->hash_lock);
1921 f = __vxlan_find_mac(vxlan, all_zeros_mac);
1922 if (f)
1923 vxlan_fdb_destroy(vxlan, f);
1924 spin_unlock_bh(&vxlan->hash_lock);
1925 }
1926
1927 static void vxlan_uninit(struct net_device *dev)
1928 {
1929 struct vxlan_dev *vxlan = netdev_priv(dev);
1930 struct vxlan_sock *vs = vxlan->vn_sock;
1931
1932 vxlan_fdb_delete_default(vxlan);
1933
1934 if (vs)
1935 vxlan_sock_release(vs);
1936 free_percpu(dev->tstats);
1937 }
1938
1939 /* Start ageing timer and join group when device is brought up */
1940 static int vxlan_open(struct net_device *dev)
1941 {
1942 struct vxlan_dev *vxlan = netdev_priv(dev);
1943 struct vxlan_sock *vs = vxlan->vn_sock;
1944
1945 /* socket hasn't been created */
1946 if (!vs)
1947 return -ENOTCONN;
1948
1949 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
1950 vxlan_sock_hold(vs);
1951 dev_hold(dev);
1952 queue_work(vxlan_wq, &vxlan->igmp_join);
1953 }
1954
1955 if (vxlan->age_interval)
1956 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1957
1958 return 0;
1959 }
1960
1961 /* Purge the forwarding table */
1962 static void vxlan_flush(struct vxlan_dev *vxlan)
1963 {
1964 unsigned int h;
1965
1966 spin_lock_bh(&vxlan->hash_lock);
1967 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1968 struct hlist_node *p, *n;
1969 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1970 struct vxlan_fdb *f
1971 = container_of(p, struct vxlan_fdb, hlist);
1972 /* the all_zeros_mac entry is deleted at vxlan_uninit */
1973 if (!is_zero_ether_addr(f->eth_addr))
1974 vxlan_fdb_destroy(vxlan, f);
1975 }
1976 }
1977 spin_unlock_bh(&vxlan->hash_lock);
1978 }
1979
1980 /* Cleanup timer and forwarding table on shutdown */
1981 static int vxlan_stop(struct net_device *dev)
1982 {
1983 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1984 struct vxlan_dev *vxlan = netdev_priv(dev);
1985 struct vxlan_sock *vs = vxlan->vn_sock;
1986
1987 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
1988 !vxlan_group_used(vn, vxlan)) {
1989 vxlan_sock_hold(vs);
1990 dev_hold(dev);
1991 queue_work(vxlan_wq, &vxlan->igmp_leave);
1992 }
1993
1994 del_timer_sync(&vxlan->age_timer);
1995
1996 vxlan_flush(vxlan);
1997
1998 return 0;
1999 }
2000
2001 /* Stub, nothing needs to be done. */
2002 static void vxlan_set_multicast_list(struct net_device *dev)
2003 {
2004 }
2005
2006 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2007 {
2008 struct vxlan_dev *vxlan = netdev_priv(dev);
2009 struct vxlan_rdst *dst = &vxlan->default_dst;
2010 struct net_device *lowerdev;
2011 int max_mtu;
2012
2013 lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex);
2014 if (lowerdev == NULL)
2015 return eth_change_mtu(dev, new_mtu);
2016
2017 if (dst->remote_ip.sa.sa_family == AF_INET6)
2018 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2019 else
2020 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2021
2022 if (new_mtu < 68 || new_mtu > max_mtu)
2023 return -EINVAL;
2024
2025 dev->mtu = new_mtu;
2026 return 0;
2027 }
2028
2029 static const struct net_device_ops vxlan_netdev_ops = {
2030 .ndo_init = vxlan_init,
2031 .ndo_uninit = vxlan_uninit,
2032 .ndo_open = vxlan_open,
2033 .ndo_stop = vxlan_stop,
2034 .ndo_start_xmit = vxlan_xmit,
2035 .ndo_get_stats64 = ip_tunnel_get_stats64,
2036 .ndo_set_rx_mode = vxlan_set_multicast_list,
2037 .ndo_change_mtu = vxlan_change_mtu,
2038 .ndo_validate_addr = eth_validate_addr,
2039 .ndo_set_mac_address = eth_mac_addr,
2040 .ndo_fdb_add = vxlan_fdb_add,
2041 .ndo_fdb_del = vxlan_fdb_delete,
2042 .ndo_fdb_dump = vxlan_fdb_dump,
2043 };
2044
2045 /* Info for udev, that this is a virtual tunnel endpoint */
2046 static struct device_type vxlan_type = {
2047 .name = "vxlan",
2048 };
2049
2050 /* Calls the ndo_add_vxlan_port of the caller in order to
2051 * supply the listening VXLAN udp ports. Callers are expected
2052 * to implement the ndo_add_vxlan_port.
2053 */
2054 void vxlan_get_rx_port(struct net_device *dev)
2055 {
2056 struct vxlan_sock *vs;
2057 struct net *net = dev_net(dev);
2058 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2059 sa_family_t sa_family;
2060 __be16 port;
2061 unsigned int i;
2062
2063 spin_lock(&vn->sock_lock);
2064 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2065 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2066 port = inet_sk(vs->sock->sk)->inet_sport;
2067 sa_family = vs->sock->sk->sk_family;
2068 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2069 port);
2070 }
2071 }
2072 spin_unlock(&vn->sock_lock);
2073 }
2074 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2075
2076 /* Initialize the device structure. */
2077 static void vxlan_setup(struct net_device *dev)
2078 {
2079 struct vxlan_dev *vxlan = netdev_priv(dev);
2080 unsigned int h;
2081 int low, high;
2082
2083 eth_hw_addr_random(dev);
2084 ether_setup(dev);
2085 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2086 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2087 else
2088 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2089
2090 dev->netdev_ops = &vxlan_netdev_ops;
2091 dev->destructor = free_netdev;
2092 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2093
2094 dev->tx_queue_len = 0;
2095 dev->features |= NETIF_F_LLTX;
2096 dev->features |= NETIF_F_NETNS_LOCAL;
2097 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2098 dev->features |= NETIF_F_RXCSUM;
2099 dev->features |= NETIF_F_GSO_SOFTWARE;
2100
2101 dev->vlan_features = dev->features;
2102 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2103 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2104 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2105 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2106 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2107 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2108
2109 INIT_LIST_HEAD(&vxlan->next);
2110 spin_lock_init(&vxlan->hash_lock);
2111 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2112 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2113 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2114
2115 init_timer_deferrable(&vxlan->age_timer);
2116 vxlan->age_timer.function = vxlan_cleanup;
2117 vxlan->age_timer.data = (unsigned long) vxlan;
2118
2119 inet_get_local_port_range(dev_net(dev), &low, &high);
2120 vxlan->port_min = low;
2121 vxlan->port_max = high;
2122 vxlan->dst_port = htons(vxlan_port);
2123
2124 vxlan->dev = dev;
2125
2126 for (h = 0; h < FDB_HASH_SIZE; ++h)
2127 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2128 }
2129
2130 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2131 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2132 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2133 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2134 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2135 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2136 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2137 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2138 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2139 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2140 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2141 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2142 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2143 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2144 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2145 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2146 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2147 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2148 };
2149
2150 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2151 {
2152 if (tb[IFLA_ADDRESS]) {
2153 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2154 pr_debug("invalid link address (not ethernet)\n");
2155 return -EINVAL;
2156 }
2157
2158 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2159 pr_debug("invalid all zero ethernet address\n");
2160 return -EADDRNOTAVAIL;
2161 }
2162 }
2163
2164 if (!data)
2165 return -EINVAL;
2166
2167 if (data[IFLA_VXLAN_ID]) {
2168 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2169 if (id >= VXLAN_VID_MASK)
2170 return -ERANGE;
2171 }
2172
2173 if (data[IFLA_VXLAN_PORT_RANGE]) {
2174 const struct ifla_vxlan_port_range *p
2175 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2176
2177 if (ntohs(p->high) < ntohs(p->low)) {
2178 pr_debug("port range %u .. %u not valid\n",
2179 ntohs(p->low), ntohs(p->high));
2180 return -EINVAL;
2181 }
2182 }
2183
2184 return 0;
2185 }
2186
2187 static void vxlan_get_drvinfo(struct net_device *netdev,
2188 struct ethtool_drvinfo *drvinfo)
2189 {
2190 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2191 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2192 }
2193
2194 static const struct ethtool_ops vxlan_ethtool_ops = {
2195 .get_drvinfo = vxlan_get_drvinfo,
2196 .get_link = ethtool_op_get_link,
2197 };
2198
2199 static void vxlan_del_work(struct work_struct *work)
2200 {
2201 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2202
2203 sk_release_kernel(vs->sock->sk);
2204 kfree_rcu(vs, rcu);
2205 }
2206
2207 #if IS_ENABLED(CONFIG_IPV6)
2208 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2209 * could be used for both IPv4 and IPv6 communications, but
2210 * users may set bindv6only=1.
2211 */
2212 static struct socket *create_v6_sock(struct net *net, __be16 port)
2213 {
2214 struct sock *sk;
2215 struct socket *sock;
2216 struct sockaddr_in6 vxlan_addr = {
2217 .sin6_family = AF_INET6,
2218 .sin6_port = port,
2219 };
2220 int rc, val = 1;
2221
2222 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2223 if (rc < 0) {
2224 pr_debug("UDPv6 socket create failed\n");
2225 return ERR_PTR(rc);
2226 }
2227
2228 /* Put in proper namespace */
2229 sk = sock->sk;
2230 sk_change_net(sk, net);
2231
2232 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2233 (char *)&val, sizeof(val));
2234 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2235 sizeof(struct sockaddr_in6));
2236 if (rc < 0) {
2237 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2238 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2239 sk_release_kernel(sk);
2240 return ERR_PTR(rc);
2241 }
2242 /* At this point, IPv6 module should have been loaded in
2243 * sock_create_kern().
2244 */
2245 BUG_ON(!ipv6_stub);
2246
2247 /* Disable multicast loopback */
2248 inet_sk(sk)->mc_loop = 0;
2249 return sock;
2250 }
2251
2252 #else
2253
2254 static struct socket *create_v6_sock(struct net *net, __be16 port)
2255 {
2256 return ERR_PTR(-EPFNOSUPPORT);
2257 }
2258 #endif
2259
2260 static struct socket *create_v4_sock(struct net *net, __be16 port)
2261 {
2262 struct sock *sk;
2263 struct socket *sock;
2264 struct sockaddr_in vxlan_addr = {
2265 .sin_family = AF_INET,
2266 .sin_addr.s_addr = htonl(INADDR_ANY),
2267 .sin_port = port,
2268 };
2269 int rc;
2270
2271 /* Create UDP socket for encapsulation receive. */
2272 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2273 if (rc < 0) {
2274 pr_debug("UDP socket create failed\n");
2275 return ERR_PTR(rc);
2276 }
2277
2278 /* Put in proper namespace */
2279 sk = sock->sk;
2280 sk_change_net(sk, net);
2281
2282 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2283 sizeof(vxlan_addr));
2284 if (rc < 0) {
2285 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2286 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2287 sk_release_kernel(sk);
2288 return ERR_PTR(rc);
2289 }
2290
2291 /* Disable multicast loopback */
2292 inet_sk(sk)->mc_loop = 0;
2293 return sock;
2294 }
2295
2296 /* Create new listen socket if needed */
2297 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2298 vxlan_rcv_t *rcv, void *data, bool ipv6)
2299 {
2300 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2301 struct vxlan_sock *vs;
2302 struct socket *sock;
2303 struct sock *sk;
2304 unsigned int h;
2305
2306 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
2307 if (!vs)
2308 return ERR_PTR(-ENOMEM);
2309
2310 for (h = 0; h < VNI_HASH_SIZE; ++h)
2311 INIT_HLIST_HEAD(&vs->vni_list[h]);
2312
2313 INIT_WORK(&vs->del_work, vxlan_del_work);
2314
2315 if (ipv6)
2316 sock = create_v6_sock(net, port);
2317 else
2318 sock = create_v4_sock(net, port);
2319 if (IS_ERR(sock)) {
2320 kfree(vs);
2321 return ERR_CAST(sock);
2322 }
2323
2324 vs->sock = sock;
2325 sk = sock->sk;
2326 atomic_set(&vs->refcnt, 1);
2327 vs->rcv = rcv;
2328 vs->data = data;
2329 rcu_assign_sk_user_data(vs->sock->sk, vs);
2330
2331 spin_lock(&vn->sock_lock);
2332 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2333 vxlan_notify_add_rx_port(sk);
2334 spin_unlock(&vn->sock_lock);
2335
2336 /* Mark socket as an encapsulation socket. */
2337 udp_sk(sk)->encap_type = 1;
2338 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2339 #if IS_ENABLED(CONFIG_IPV6)
2340 if (ipv6)
2341 ipv6_stub->udpv6_encap_enable();
2342 else
2343 #endif
2344 udp_encap_enable();
2345
2346 return vs;
2347 }
2348
2349 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2350 vxlan_rcv_t *rcv, void *data,
2351 bool no_share, bool ipv6)
2352 {
2353 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2354 struct vxlan_sock *vs;
2355
2356 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2357 if (!IS_ERR(vs))
2358 return vs;
2359
2360 if (no_share) /* Return error if sharing is not allowed. */
2361 return vs;
2362
2363 spin_lock(&vn->sock_lock);
2364 vs = vxlan_find_sock(net, port);
2365 if (vs) {
2366 if (vs->rcv == rcv)
2367 atomic_inc(&vs->refcnt);
2368 else
2369 vs = ERR_PTR(-EBUSY);
2370 }
2371 spin_unlock(&vn->sock_lock);
2372
2373 if (!vs)
2374 vs = ERR_PTR(-EINVAL);
2375
2376 return vs;
2377 }
2378 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2379
2380 /* Scheduled at device creation to bind to a socket */
2381 static void vxlan_sock_work(struct work_struct *work)
2382 {
2383 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2384 struct net *net = dev_net(vxlan->dev);
2385 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2386 __be16 port = vxlan->dst_port;
2387 struct vxlan_sock *nvs;
2388
2389 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2390 spin_lock(&vn->sock_lock);
2391 if (!IS_ERR(nvs))
2392 vxlan_vs_add_dev(nvs, vxlan);
2393 spin_unlock(&vn->sock_lock);
2394
2395 dev_put(vxlan->dev);
2396 }
2397
2398 static int vxlan_newlink(struct net *net, struct net_device *dev,
2399 struct nlattr *tb[], struct nlattr *data[])
2400 {
2401 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2402 struct vxlan_dev *vxlan = netdev_priv(dev);
2403 struct vxlan_rdst *dst = &vxlan->default_dst;
2404 __u32 vni;
2405 int err;
2406 bool use_ipv6 = false;
2407
2408 if (!data[IFLA_VXLAN_ID])
2409 return -EINVAL;
2410
2411 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2412 dst->remote_vni = vni;
2413
2414 if (data[IFLA_VXLAN_GROUP]) {
2415 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2416 dst->remote_ip.sa.sa_family = AF_INET;
2417 } else if (data[IFLA_VXLAN_GROUP6]) {
2418 if (!IS_ENABLED(CONFIG_IPV6))
2419 return -EPFNOSUPPORT;
2420
2421 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2422 sizeof(struct in6_addr));
2423 dst->remote_ip.sa.sa_family = AF_INET6;
2424 use_ipv6 = true;
2425 }
2426
2427 if (data[IFLA_VXLAN_LOCAL]) {
2428 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2429 vxlan->saddr.sa.sa_family = AF_INET;
2430 } else if (data[IFLA_VXLAN_LOCAL6]) {
2431 if (!IS_ENABLED(CONFIG_IPV6))
2432 return -EPFNOSUPPORT;
2433
2434 /* TODO: respect scope id */
2435 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2436 sizeof(struct in6_addr));
2437 vxlan->saddr.sa.sa_family = AF_INET6;
2438 use_ipv6 = true;
2439 }
2440
2441 if (data[IFLA_VXLAN_LINK] &&
2442 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2443 struct net_device *lowerdev
2444 = __dev_get_by_index(net, dst->remote_ifindex);
2445
2446 if (!lowerdev) {
2447 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2448 return -ENODEV;
2449 }
2450
2451 #if IS_ENABLED(CONFIG_IPV6)
2452 if (use_ipv6) {
2453 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2454 if (idev && idev->cnf.disable_ipv6) {
2455 pr_info("IPv6 is disabled via sysctl\n");
2456 return -EPERM;
2457 }
2458 vxlan->flags |= VXLAN_F_IPV6;
2459 }
2460 #endif
2461
2462 if (!tb[IFLA_MTU])
2463 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2464
2465 /* update header length based on lower device */
2466 dev->hard_header_len = lowerdev->hard_header_len +
2467 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2468 } else if (use_ipv6)
2469 vxlan->flags |= VXLAN_F_IPV6;
2470
2471 if (data[IFLA_VXLAN_TOS])
2472 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2473
2474 if (data[IFLA_VXLAN_TTL])
2475 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2476
2477 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2478 vxlan->flags |= VXLAN_F_LEARN;
2479
2480 if (data[IFLA_VXLAN_AGEING])
2481 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2482 else
2483 vxlan->age_interval = FDB_AGE_DEFAULT;
2484
2485 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2486 vxlan->flags |= VXLAN_F_PROXY;
2487
2488 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2489 vxlan->flags |= VXLAN_F_RSC;
2490
2491 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2492 vxlan->flags |= VXLAN_F_L2MISS;
2493
2494 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2495 vxlan->flags |= VXLAN_F_L3MISS;
2496
2497 if (data[IFLA_VXLAN_LIMIT])
2498 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2499
2500 if (data[IFLA_VXLAN_PORT_RANGE]) {
2501 const struct ifla_vxlan_port_range *p
2502 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2503 vxlan->port_min = ntohs(p->low);
2504 vxlan->port_max = ntohs(p->high);
2505 }
2506
2507 if (data[IFLA_VXLAN_PORT])
2508 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2509
2510 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2511 pr_info("duplicate VNI %u\n", vni);
2512 return -EEXIST;
2513 }
2514
2515 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2516
2517 /* create an fdb entry for a valid default destination */
2518 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2519 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2520 &vxlan->default_dst.remote_ip,
2521 NUD_REACHABLE|NUD_PERMANENT,
2522 NLM_F_EXCL|NLM_F_CREATE,
2523 vxlan->dst_port,
2524 vxlan->default_dst.remote_vni,
2525 vxlan->default_dst.remote_ifindex,
2526 NTF_SELF);
2527 if (err)
2528 return err;
2529 }
2530
2531 err = register_netdevice(dev);
2532 if (err) {
2533 vxlan_fdb_delete_default(vxlan);
2534 return err;
2535 }
2536
2537 list_add(&vxlan->next, &vn->vxlan_list);
2538
2539 return 0;
2540 }
2541
2542 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2543 {
2544 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2545 struct vxlan_dev *vxlan = netdev_priv(dev);
2546
2547 spin_lock(&vn->sock_lock);
2548 if (!hlist_unhashed(&vxlan->hlist))
2549 hlist_del_rcu(&vxlan->hlist);
2550 spin_unlock(&vn->sock_lock);
2551
2552 list_del(&vxlan->next);
2553 unregister_netdevice_queue(dev, head);
2554 }
2555
2556 static size_t vxlan_get_size(const struct net_device *dev)
2557 {
2558
2559 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2560 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2561 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2562 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2563 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2564 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2565 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2566 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2567 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2568 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2569 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2570 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2571 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2572 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2573 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2574 0;
2575 }
2576
2577 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2578 {
2579 const struct vxlan_dev *vxlan = netdev_priv(dev);
2580 const struct vxlan_rdst *dst = &vxlan->default_dst;
2581 struct ifla_vxlan_port_range ports = {
2582 .low = htons(vxlan->port_min),
2583 .high = htons(vxlan->port_max),
2584 };
2585
2586 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2587 goto nla_put_failure;
2588
2589 if (!vxlan_addr_any(&dst->remote_ip)) {
2590 if (dst->remote_ip.sa.sa_family == AF_INET) {
2591 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2592 dst->remote_ip.sin.sin_addr.s_addr))
2593 goto nla_put_failure;
2594 #if IS_ENABLED(CONFIG_IPV6)
2595 } else {
2596 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2597 &dst->remote_ip.sin6.sin6_addr))
2598 goto nla_put_failure;
2599 #endif
2600 }
2601 }
2602
2603 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2604 goto nla_put_failure;
2605
2606 if (!vxlan_addr_any(&vxlan->saddr)) {
2607 if (vxlan->saddr.sa.sa_family == AF_INET) {
2608 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2609 vxlan->saddr.sin.sin_addr.s_addr))
2610 goto nla_put_failure;
2611 #if IS_ENABLED(CONFIG_IPV6)
2612 } else {
2613 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2614 &vxlan->saddr.sin6.sin6_addr))
2615 goto nla_put_failure;
2616 #endif
2617 }
2618 }
2619
2620 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2621 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2622 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2623 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2624 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2625 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2626 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2627 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2628 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2629 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2630 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2631 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2632 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2633 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2634 goto nla_put_failure;
2635
2636 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2637 goto nla_put_failure;
2638
2639 return 0;
2640
2641 nla_put_failure:
2642 return -EMSGSIZE;
2643 }
2644
2645 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2646 .kind = "vxlan",
2647 .maxtype = IFLA_VXLAN_MAX,
2648 .policy = vxlan_policy,
2649 .priv_size = sizeof(struct vxlan_dev),
2650 .setup = vxlan_setup,
2651 .validate = vxlan_validate,
2652 .newlink = vxlan_newlink,
2653 .dellink = vxlan_dellink,
2654 .get_size = vxlan_get_size,
2655 .fill_info = vxlan_fill_info,
2656 };
2657
2658 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2659 struct net_device *dev)
2660 {
2661 struct vxlan_dev *vxlan, *next;
2662 LIST_HEAD(list_kill);
2663
2664 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2665 struct vxlan_rdst *dst = &vxlan->default_dst;
2666
2667 /* In case we created vxlan device with carrier
2668 * and we loose the carrier due to module unload
2669 * we also need to remove vxlan device. In other
2670 * cases, it's not necessary and remote_ifindex
2671 * is 0 here, so no matches.
2672 */
2673 if (dst->remote_ifindex == dev->ifindex)
2674 vxlan_dellink(vxlan->dev, &list_kill);
2675 }
2676
2677 unregister_netdevice_many(&list_kill);
2678 }
2679
2680 static int vxlan_lowerdev_event(struct notifier_block *unused,
2681 unsigned long event, void *ptr)
2682 {
2683 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2684 struct vxlan_net *vn;
2685
2686 if (event == NETDEV_UNREGISTER) {
2687 vn = net_generic(dev_net(dev), vxlan_net_id);
2688 vxlan_handle_lowerdev_unregister(vn, dev);
2689 }
2690
2691 return NOTIFY_DONE;
2692 }
2693
2694 static struct notifier_block vxlan_notifier_block __read_mostly = {
2695 .notifier_call = vxlan_lowerdev_event,
2696 };
2697
2698 static __net_init int vxlan_init_net(struct net *net)
2699 {
2700 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2701 unsigned int h;
2702
2703 INIT_LIST_HEAD(&vn->vxlan_list);
2704 spin_lock_init(&vn->sock_lock);
2705
2706 for (h = 0; h < PORT_HASH_SIZE; ++h)
2707 INIT_HLIST_HEAD(&vn->sock_list[h]);
2708
2709 return 0;
2710 }
2711
2712 static __net_exit void vxlan_exit_net(struct net *net)
2713 {
2714 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2715 struct vxlan_dev *vxlan, *next;
2716 LIST_HEAD(list_kill);
2717
2718 rtnl_lock();
2719 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next)
2720 vxlan_dellink(vxlan->dev, &list_kill);
2721 unregister_netdevice_many(&list_kill);
2722 rtnl_unlock();
2723 }
2724
2725 static struct pernet_operations vxlan_net_ops = {
2726 .init = vxlan_init_net,
2727 .exit = vxlan_exit_net,
2728 .id = &vxlan_net_id,
2729 .size = sizeof(struct vxlan_net),
2730 };
2731
2732 static int __init vxlan_init_module(void)
2733 {
2734 int rc;
2735
2736 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2737 if (!vxlan_wq)
2738 return -ENOMEM;
2739
2740 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2741
2742 rc = register_pernet_device(&vxlan_net_ops);
2743 if (rc)
2744 goto out1;
2745
2746 rc = register_netdevice_notifier(&vxlan_notifier_block);
2747 if (rc)
2748 goto out2;
2749
2750 rc = rtnl_link_register(&vxlan_link_ops);
2751 if (rc)
2752 goto out3;
2753
2754 return 0;
2755 out3:
2756 unregister_netdevice_notifier(&vxlan_notifier_block);
2757 out2:
2758 unregister_pernet_device(&vxlan_net_ops);
2759 out1:
2760 destroy_workqueue(vxlan_wq);
2761 return rc;
2762 }
2763 late_initcall(vxlan_init_module);
2764
2765 static void __exit vxlan_cleanup_module(void)
2766 {
2767 rtnl_link_unregister(&vxlan_link_ops);
2768 unregister_netdevice_notifier(&vxlan_notifier_block);
2769 destroy_workqueue(vxlan_wq);
2770 unregister_pernet_device(&vxlan_net_ops);
2771 rcu_barrier();
2772 }
2773 module_exit(vxlan_cleanup_module);
2774
2775 MODULE_LICENSE("GPL");
2776 MODULE_VERSION(VXLAN_VERSION);
2777 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2778 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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