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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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 #include <net/protocol.h>
44 #if IS_ENABLED(CONFIG_IPV6)
45 #include <net/ipv6.h>
46 #include <net/addrconf.h>
47 #include <net/ip6_tunnel.h>
48 #include <net/ip6_checksum.h>
49 #endif
50
51 #define VXLAN_VERSION "0.1"
52
53 #define PORT_HASH_BITS 8
54 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
55 #define VNI_HASH_BITS 10
56 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
57 #define FDB_HASH_BITS 8
58 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
59 #define FDB_AGE_DEFAULT 300 /* 5 min */
60 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61
62 #define VXLAN_N_VID (1u << 24)
63 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
64 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
65
66 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
67
68 /* VXLAN protocol header */
69 struct vxlanhdr {
70 __be32 vx_flags;
71 __be32 vx_vni;
72 };
73
74 /* UDP port for VXLAN traffic.
75 * The IANA assigned port is 4789, but the Linux default is 8472
76 * for compatibility with early adopters.
77 */
78 static unsigned short vxlan_port __read_mostly = 8472;
79 module_param_named(udp_port, vxlan_port, ushort, 0444);
80 MODULE_PARM_DESC(udp_port, "Destination UDP port");
81
82 static bool log_ecn_error = true;
83 module_param(log_ecn_error, bool, 0644);
84 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
85
86 static int vxlan_net_id;
87
88 static const u8 all_zeros_mac[ETH_ALEN];
89
90 /* per-network namespace private data for this module */
91 struct vxlan_net {
92 struct list_head vxlan_list;
93 struct hlist_head sock_list[PORT_HASH_SIZE];
94 spinlock_t sock_lock;
95 };
96
97 union vxlan_addr {
98 struct sockaddr_in sin;
99 struct sockaddr_in6 sin6;
100 struct sockaddr sa;
101 };
102
103 struct vxlan_rdst {
104 union vxlan_addr remote_ip;
105 __be16 remote_port;
106 u32 remote_vni;
107 u32 remote_ifindex;
108 struct list_head list;
109 struct rcu_head rcu;
110 };
111
112 /* Forwarding table entry */
113 struct vxlan_fdb {
114 struct hlist_node hlist; /* linked list of entries */
115 struct rcu_head rcu;
116 unsigned long updated; /* jiffies */
117 unsigned long used;
118 struct list_head remotes;
119 u16 state; /* see ndm_state */
120 u8 flags; /* see ndm_flags */
121 u8 eth_addr[ETH_ALEN];
122 };
123
124 /* Pseudo network device */
125 struct vxlan_dev {
126 struct hlist_node hlist; /* vni hash table */
127 struct list_head next; /* vxlan's per namespace list */
128 struct vxlan_sock *vn_sock; /* listening socket */
129 struct net_device *dev;
130 struct vxlan_rdst default_dst; /* default destination */
131 union vxlan_addr saddr; /* source address */
132 __be16 dst_port;
133 __u16 port_min; /* source port range */
134 __u16 port_max;
135 __u8 tos; /* TOS override */
136 __u8 ttl;
137 u32 flags; /* VXLAN_F_* below */
138
139 struct work_struct sock_work;
140 struct work_struct igmp_join;
141 struct work_struct igmp_leave;
142
143 unsigned long age_interval;
144 struct timer_list age_timer;
145 spinlock_t hash_lock;
146 unsigned int addrcnt;
147 unsigned int addrmax;
148
149 struct hlist_head fdb_head[FDB_HASH_SIZE];
150 };
151
152 #define VXLAN_F_LEARN 0x01
153 #define VXLAN_F_PROXY 0x02
154 #define VXLAN_F_RSC 0x04
155 #define VXLAN_F_L2MISS 0x08
156 #define VXLAN_F_L3MISS 0x10
157 #define VXLAN_F_IPV6 0x20 /* internal flag */
158
159 /* salt for hash table */
160 static u32 vxlan_salt __read_mostly;
161 static struct workqueue_struct *vxlan_wq;
162
163 static void vxlan_sock_work(struct work_struct *work);
164
165 #if IS_ENABLED(CONFIG_IPV6)
166 static inline
167 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
168 {
169 if (a->sa.sa_family != b->sa.sa_family)
170 return false;
171 if (a->sa.sa_family == AF_INET6)
172 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
173 else
174 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
175 }
176
177 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
178 {
179 if (ipa->sa.sa_family == AF_INET6)
180 return ipv6_addr_any(&ipa->sin6.sin6_addr);
181 else
182 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
183 }
184
185 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
186 {
187 if (ipa->sa.sa_family == AF_INET6)
188 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
189 else
190 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
191 }
192
193 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
194 {
195 if (nla_len(nla) >= sizeof(struct in6_addr)) {
196 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
197 ip->sa.sa_family = AF_INET6;
198 return 0;
199 } else if (nla_len(nla) >= sizeof(__be32)) {
200 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
201 ip->sa.sa_family = AF_INET;
202 return 0;
203 } else {
204 return -EAFNOSUPPORT;
205 }
206 }
207
208 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
209 const union vxlan_addr *ip)
210 {
211 if (ip->sa.sa_family == AF_INET6)
212 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
213 else
214 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
215 }
216
217 #else /* !CONFIG_IPV6 */
218
219 static inline
220 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
221 {
222 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
223 }
224
225 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
226 {
227 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
228 }
229
230 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
231 {
232 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
233 }
234
235 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
236 {
237 if (nla_len(nla) >= sizeof(struct in6_addr)) {
238 return -EAFNOSUPPORT;
239 } else if (nla_len(nla) >= sizeof(__be32)) {
240 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
241 ip->sa.sa_family = AF_INET;
242 return 0;
243 } else {
244 return -EAFNOSUPPORT;
245 }
246 }
247
248 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
249 const union vxlan_addr *ip)
250 {
251 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
252 }
253 #endif
254
255 /* Virtual Network hash table head */
256 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
257 {
258 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
259 }
260
261 /* Socket hash table head */
262 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
263 {
264 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
265
266 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
267 }
268
269 /* First remote destination for a forwarding entry.
270 * Guaranteed to be non-NULL because remotes are never deleted.
271 */
272 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
273 {
274 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
275 }
276
277 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
278 {
279 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
280 }
281
282 /* Find VXLAN socket based on network namespace and UDP port */
283 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
284 {
285 struct vxlan_sock *vs;
286
287 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
288 if (inet_sk(vs->sock->sk)->inet_sport == port)
289 return vs;
290 }
291 return NULL;
292 }
293
294 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
295 {
296 struct vxlan_dev *vxlan;
297
298 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
299 if (vxlan->default_dst.remote_vni == id)
300 return vxlan;
301 }
302
303 return NULL;
304 }
305
306 /* Look up VNI in a per net namespace table */
307 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
308 {
309 struct vxlan_sock *vs;
310
311 vs = vxlan_find_sock(net, port);
312 if (!vs)
313 return NULL;
314
315 return vxlan_vs_find_vni(vs, id);
316 }
317
318 /* Fill in neighbour message in skbuff. */
319 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
320 const struct vxlan_fdb *fdb,
321 u32 portid, u32 seq, int type, unsigned int flags,
322 const struct vxlan_rdst *rdst)
323 {
324 unsigned long now = jiffies;
325 struct nda_cacheinfo ci;
326 struct nlmsghdr *nlh;
327 struct ndmsg *ndm;
328 bool send_ip, send_eth;
329
330 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
331 if (nlh == NULL)
332 return -EMSGSIZE;
333
334 ndm = nlmsg_data(nlh);
335 memset(ndm, 0, sizeof(*ndm));
336
337 send_eth = send_ip = true;
338
339 if (type == RTM_GETNEIGH) {
340 ndm->ndm_family = AF_INET;
341 send_ip = !vxlan_addr_any(&rdst->remote_ip);
342 send_eth = !is_zero_ether_addr(fdb->eth_addr);
343 } else
344 ndm->ndm_family = AF_BRIDGE;
345 ndm->ndm_state = fdb->state;
346 ndm->ndm_ifindex = vxlan->dev->ifindex;
347 ndm->ndm_flags = fdb->flags;
348 ndm->ndm_type = NDA_DST;
349
350 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
351 goto nla_put_failure;
352
353 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
354 goto nla_put_failure;
355
356 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
357 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
358 goto nla_put_failure;
359 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
360 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
361 goto nla_put_failure;
362 if (rdst->remote_ifindex &&
363 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
364 goto nla_put_failure;
365
366 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
367 ci.ndm_confirmed = 0;
368 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
369 ci.ndm_refcnt = 0;
370
371 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
372 goto nla_put_failure;
373
374 return nlmsg_end(skb, nlh);
375
376 nla_put_failure:
377 nlmsg_cancel(skb, nlh);
378 return -EMSGSIZE;
379 }
380
381 static inline size_t vxlan_nlmsg_size(void)
382 {
383 return NLMSG_ALIGN(sizeof(struct ndmsg))
384 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
385 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
386 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
387 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
388 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
389 + nla_total_size(sizeof(struct nda_cacheinfo));
390 }
391
392 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
393 struct vxlan_fdb *fdb, int type)
394 {
395 struct net *net = dev_net(vxlan->dev);
396 struct sk_buff *skb;
397 int err = -ENOBUFS;
398
399 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
400 if (skb == NULL)
401 goto errout;
402
403 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0,
404 first_remote_rtnl(fdb));
405 if (err < 0) {
406 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
407 WARN_ON(err == -EMSGSIZE);
408 kfree_skb(skb);
409 goto errout;
410 }
411
412 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
413 return;
414 errout:
415 if (err < 0)
416 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
417 }
418
419 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
420 {
421 struct vxlan_dev *vxlan = netdev_priv(dev);
422 struct vxlan_fdb f = {
423 .state = NUD_STALE,
424 };
425 struct vxlan_rdst remote = {
426 .remote_ip = *ipa, /* goes to NDA_DST */
427 .remote_vni = VXLAN_N_VID,
428 };
429
430 INIT_LIST_HEAD(&f.remotes);
431 list_add_rcu(&remote.list, &f.remotes);
432
433 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
434 }
435
436 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
437 {
438 struct vxlan_fdb f = {
439 .state = NUD_STALE,
440 };
441
442 INIT_LIST_HEAD(&f.remotes);
443 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
444
445 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
446 }
447
448 /* Hash Ethernet address */
449 static u32 eth_hash(const unsigned char *addr)
450 {
451 u64 value = get_unaligned((u64 *)addr);
452
453 /* only want 6 bytes */
454 #ifdef __BIG_ENDIAN
455 value >>= 16;
456 #else
457 value <<= 16;
458 #endif
459 return hash_64(value, FDB_HASH_BITS);
460 }
461
462 /* Hash chain to use given mac address */
463 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
464 const u8 *mac)
465 {
466 return &vxlan->fdb_head[eth_hash(mac)];
467 }
468
469 /* Look up Ethernet address in forwarding table */
470 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
471 const u8 *mac)
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 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
558 {
559 struct sk_buff *p, **pp = NULL;
560 struct vxlanhdr *vh, *vh2;
561 struct ethhdr *eh, *eh2;
562 unsigned int hlen, off_vx, off_eth;
563 const struct packet_offload *ptype;
564 __be16 type;
565 int flush = 1;
566
567 off_vx = skb_gro_offset(skb);
568 hlen = off_vx + sizeof(*vh);
569 vh = skb_gro_header_fast(skb, off_vx);
570 if (skb_gro_header_hard(skb, hlen)) {
571 vh = skb_gro_header_slow(skb, hlen, off_vx);
572 if (unlikely(!vh))
573 goto out;
574 }
575 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
576
577 off_eth = skb_gro_offset(skb);
578 hlen = off_eth + sizeof(*eh);
579 eh = skb_gro_header_fast(skb, off_eth);
580 if (skb_gro_header_hard(skb, hlen)) {
581 eh = skb_gro_header_slow(skb, hlen, off_eth);
582 if (unlikely(!eh))
583 goto out;
584 }
585
586 flush = 0;
587
588 for (p = *head; p; p = p->next) {
589 if (!NAPI_GRO_CB(p)->same_flow)
590 continue;
591
592 vh2 = (struct vxlanhdr *)(p->data + off_vx);
593 eh2 = (struct ethhdr *)(p->data + off_eth);
594 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
595 NAPI_GRO_CB(p)->same_flow = 0;
596 continue;
597 }
598 }
599
600 type = eh->h_proto;
601
602 rcu_read_lock();
603 ptype = gro_find_receive_by_type(type);
604 if (ptype == NULL) {
605 flush = 1;
606 goto out_unlock;
607 }
608
609 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
610 pp = ptype->callbacks.gro_receive(head, skb);
611
612 out_unlock:
613 rcu_read_unlock();
614 out:
615 NAPI_GRO_CB(skb)->flush |= flush;
616
617 return pp;
618 }
619
620 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
621 {
622 struct ethhdr *eh;
623 struct packet_offload *ptype;
624 __be16 type;
625 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
626 int err = -ENOSYS;
627
628 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
629 type = eh->h_proto;
630
631 rcu_read_lock();
632 ptype = gro_find_complete_by_type(type);
633 if (ptype != NULL)
634 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
635
636 rcu_read_unlock();
637 return err;
638 }
639
640 /* Notify netdevs that UDP port started listening */
641 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
642 {
643 struct net_device *dev;
644 struct sock *sk = vs->sock->sk;
645 struct net *net = sock_net(sk);
646 sa_family_t sa_family = sk->sk_family;
647 __be16 port = inet_sk(sk)->inet_sport;
648 int err;
649
650 if (sa_family == AF_INET) {
651 err = udp_add_offload(&vs->udp_offloads);
652 if (err)
653 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
654 }
655
656 rcu_read_lock();
657 for_each_netdev_rcu(net, dev) {
658 if (dev->netdev_ops->ndo_add_vxlan_port)
659 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
660 port);
661 }
662 rcu_read_unlock();
663 }
664
665 /* Notify netdevs that UDP port is no more listening */
666 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
667 {
668 struct net_device *dev;
669 struct sock *sk = vs->sock->sk;
670 struct net *net = sock_net(sk);
671 sa_family_t sa_family = sk->sk_family;
672 __be16 port = inet_sk(sk)->inet_sport;
673
674 rcu_read_lock();
675 for_each_netdev_rcu(net, dev) {
676 if (dev->netdev_ops->ndo_del_vxlan_port)
677 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
678 port);
679 }
680 rcu_read_unlock();
681
682 if (sa_family == AF_INET)
683 udp_del_offload(&vs->udp_offloads);
684 }
685
686 /* Add new entry to forwarding table -- assumes lock held */
687 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
688 const u8 *mac, union vxlan_addr *ip,
689 __u16 state, __u16 flags,
690 __be16 port, __u32 vni, __u32 ifindex,
691 __u8 ndm_flags)
692 {
693 struct vxlan_fdb *f;
694 int notify = 0;
695
696 f = __vxlan_find_mac(vxlan, mac);
697 if (f) {
698 if (flags & NLM_F_EXCL) {
699 netdev_dbg(vxlan->dev,
700 "lost race to create %pM\n", mac);
701 return -EEXIST;
702 }
703 if (f->state != state) {
704 f->state = state;
705 f->updated = jiffies;
706 notify = 1;
707 }
708 if (f->flags != ndm_flags) {
709 f->flags = ndm_flags;
710 f->updated = jiffies;
711 notify = 1;
712 }
713 if ((flags & NLM_F_REPLACE)) {
714 /* Only change unicasts */
715 if (!(is_multicast_ether_addr(f->eth_addr) ||
716 is_zero_ether_addr(f->eth_addr))) {
717 int rc = vxlan_fdb_replace(f, ip, port, vni,
718 ifindex);
719
720 if (rc < 0)
721 return rc;
722 notify |= rc;
723 } else
724 return -EOPNOTSUPP;
725 }
726 if ((flags & NLM_F_APPEND) &&
727 (is_multicast_ether_addr(f->eth_addr) ||
728 is_zero_ether_addr(f->eth_addr))) {
729 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
730
731 if (rc < 0)
732 return rc;
733 notify |= rc;
734 }
735 } else {
736 if (!(flags & NLM_F_CREATE))
737 return -ENOENT;
738
739 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
740 return -ENOSPC;
741
742 /* Disallow replace to add a multicast entry */
743 if ((flags & NLM_F_REPLACE) &&
744 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
745 return -EOPNOTSUPP;
746
747 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
748 f = kmalloc(sizeof(*f), GFP_ATOMIC);
749 if (!f)
750 return -ENOMEM;
751
752 notify = 1;
753 f->state = state;
754 f->flags = ndm_flags;
755 f->updated = f->used = jiffies;
756 INIT_LIST_HEAD(&f->remotes);
757 memcpy(f->eth_addr, mac, ETH_ALEN);
758
759 vxlan_fdb_append(f, ip, port, vni, ifindex);
760
761 ++vxlan->addrcnt;
762 hlist_add_head_rcu(&f->hlist,
763 vxlan_fdb_head(vxlan, mac));
764 }
765
766 if (notify)
767 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
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, 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 kfree_rcu(rd, rcu);
923 goto out;
924 }
925
926 vxlan_fdb_destroy(vxlan, f);
927
928 out:
929 spin_unlock_bh(&vxlan->hash_lock);
930
931 return err;
932 }
933
934 /* Dump forwarding table */
935 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
936 struct net_device *dev, int idx)
937 {
938 struct vxlan_dev *vxlan = netdev_priv(dev);
939 unsigned int h;
940
941 for (h = 0; h < FDB_HASH_SIZE; ++h) {
942 struct vxlan_fdb *f;
943 int err;
944
945 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
946 struct vxlan_rdst *rd;
947
948 if (idx < cb->args[0])
949 goto skip;
950
951 list_for_each_entry_rcu(rd, &f->remotes, list) {
952 err = vxlan_fdb_info(skb, vxlan, f,
953 NETLINK_CB(cb->skb).portid,
954 cb->nlh->nlmsg_seq,
955 RTM_NEWNEIGH,
956 NLM_F_MULTI, rd);
957 if (err < 0)
958 goto out;
959 }
960 skip:
961 ++idx;
962 }
963 }
964 out:
965 return idx;
966 }
967
968 /* Watch incoming packets to learn mapping between Ethernet address
969 * and Tunnel endpoint.
970 * Return true if packet is bogus and should be droppped.
971 */
972 static bool vxlan_snoop(struct net_device *dev,
973 union vxlan_addr *src_ip, const u8 *src_mac)
974 {
975 struct vxlan_dev *vxlan = netdev_priv(dev);
976 struct vxlan_fdb *f;
977
978 f = vxlan_find_mac(vxlan, src_mac);
979 if (likely(f)) {
980 struct vxlan_rdst *rdst = first_remote_rcu(f);
981
982 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
983 return false;
984
985 /* Don't migrate static entries, drop packets */
986 if (f->state & NUD_NOARP)
987 return true;
988
989 if (net_ratelimit())
990 netdev_info(dev,
991 "%pM migrated from %pIS to %pIS\n",
992 src_mac, &rdst->remote_ip, &src_ip);
993
994 rdst->remote_ip = *src_ip;
995 f->updated = jiffies;
996 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
997 } else {
998 /* learned new entry */
999 spin_lock(&vxlan->hash_lock);
1000
1001 /* close off race between vxlan_flush and incoming packets */
1002 if (netif_running(dev))
1003 vxlan_fdb_create(vxlan, src_mac, src_ip,
1004 NUD_REACHABLE,
1005 NLM_F_EXCL|NLM_F_CREATE,
1006 vxlan->dst_port,
1007 vxlan->default_dst.remote_vni,
1008 0, NTF_SELF);
1009 spin_unlock(&vxlan->hash_lock);
1010 }
1011
1012 return false;
1013 }
1014
1015 /* See if multicast group is already in use by other ID */
1016 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1017 {
1018 struct vxlan_dev *vxlan;
1019
1020 /* The vxlan_sock is only used by dev, leaving group has
1021 * no effect on other vxlan devices.
1022 */
1023 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1024 return false;
1025
1026 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1027 if (!netif_running(vxlan->dev) || vxlan == dev)
1028 continue;
1029
1030 if (vxlan->vn_sock != dev->vn_sock)
1031 continue;
1032
1033 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1034 &dev->default_dst.remote_ip))
1035 continue;
1036
1037 if (vxlan->default_dst.remote_ifindex !=
1038 dev->default_dst.remote_ifindex)
1039 continue;
1040
1041 return true;
1042 }
1043
1044 return false;
1045 }
1046
1047 static void vxlan_sock_hold(struct vxlan_sock *vs)
1048 {
1049 atomic_inc(&vs->refcnt);
1050 }
1051
1052 void vxlan_sock_release(struct vxlan_sock *vs)
1053 {
1054 struct sock *sk = vs->sock->sk;
1055 struct net *net = sock_net(sk);
1056 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1057
1058 if (!atomic_dec_and_test(&vs->refcnt))
1059 return;
1060
1061 spin_lock(&vn->sock_lock);
1062 hlist_del_rcu(&vs->hlist);
1063 rcu_assign_sk_user_data(vs->sock->sk, NULL);
1064 vxlan_notify_del_rx_port(vs);
1065 spin_unlock(&vn->sock_lock);
1066
1067 queue_work(vxlan_wq, &vs->del_work);
1068 }
1069 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1070
1071 /* Callback to update multicast group membership when first VNI on
1072 * multicast asddress is brought up
1073 * Done as workqueue because ip_mc_join_group acquires RTNL.
1074 */
1075 static void vxlan_igmp_join(struct work_struct *work)
1076 {
1077 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1078 struct vxlan_sock *vs = vxlan->vn_sock;
1079 struct sock *sk = vs->sock->sk;
1080 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1081 int ifindex = vxlan->default_dst.remote_ifindex;
1082
1083 lock_sock(sk);
1084 if (ip->sa.sa_family == AF_INET) {
1085 struct ip_mreqn mreq = {
1086 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1087 .imr_ifindex = ifindex,
1088 };
1089
1090 ip_mc_join_group(sk, &mreq);
1091 #if IS_ENABLED(CONFIG_IPV6)
1092 } else {
1093 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1094 &ip->sin6.sin6_addr);
1095 #endif
1096 }
1097 release_sock(sk);
1098
1099 vxlan_sock_release(vs);
1100 dev_put(vxlan->dev);
1101 }
1102
1103 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1104 static void vxlan_igmp_leave(struct work_struct *work)
1105 {
1106 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1107 struct vxlan_sock *vs = vxlan->vn_sock;
1108 struct sock *sk = vs->sock->sk;
1109 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1110 int ifindex = vxlan->default_dst.remote_ifindex;
1111
1112 lock_sock(sk);
1113 if (ip->sa.sa_family == AF_INET) {
1114 struct ip_mreqn mreq = {
1115 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1116 .imr_ifindex = ifindex,
1117 };
1118
1119 ip_mc_leave_group(sk, &mreq);
1120 #if IS_ENABLED(CONFIG_IPV6)
1121 } else {
1122 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1123 &ip->sin6.sin6_addr);
1124 #endif
1125 }
1126
1127 release_sock(sk);
1128
1129 vxlan_sock_release(vs);
1130 dev_put(vxlan->dev);
1131 }
1132
1133 /* Callback from net/ipv4/udp.c to receive packets */
1134 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1135 {
1136 struct vxlan_sock *vs;
1137 struct vxlanhdr *vxh;
1138
1139 /* Need Vxlan and inner Ethernet header to be present */
1140 if (!pskb_may_pull(skb, VXLAN_HLEN))
1141 goto error;
1142
1143 /* Return packets with reserved bits set */
1144 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1145 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1146 (vxh->vx_vni & htonl(0xff))) {
1147 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1148 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1149 goto error;
1150 }
1151
1152 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1153 goto drop;
1154
1155 vs = rcu_dereference_sk_user_data(sk);
1156 if (!vs)
1157 goto drop;
1158
1159 /* If the NIC driver gave us an encapsulated packet
1160 * with the encapsulation mark, the device checksummed it
1161 * for us. Otherwise force the upper layers to verify it.
1162 */
1163 if ((skb->ip_summed != CHECKSUM_UNNECESSARY && skb->ip_summed != CHECKSUM_PARTIAL) ||
1164 !skb->encapsulation)
1165 skb->ip_summed = CHECKSUM_NONE;
1166
1167 skb->encapsulation = 0;
1168
1169 vs->rcv(vs, skb, vxh->vx_vni);
1170 return 0;
1171
1172 drop:
1173 /* Consume bad packet */
1174 kfree_skb(skb);
1175 return 0;
1176
1177 error:
1178 /* Return non vxlan pkt */
1179 return 1;
1180 }
1181
1182 static void vxlan_rcv(struct vxlan_sock *vs,
1183 struct sk_buff *skb, __be32 vx_vni)
1184 {
1185 struct iphdr *oip = NULL;
1186 struct ipv6hdr *oip6 = NULL;
1187 struct vxlan_dev *vxlan;
1188 struct pcpu_sw_netstats *stats;
1189 union vxlan_addr saddr;
1190 __u32 vni;
1191 int err = 0;
1192 union vxlan_addr *remote_ip;
1193
1194 vni = ntohl(vx_vni) >> 8;
1195 /* Is this VNI defined? */
1196 vxlan = vxlan_vs_find_vni(vs, vni);
1197 if (!vxlan)
1198 goto drop;
1199
1200 remote_ip = &vxlan->default_dst.remote_ip;
1201 skb_reset_mac_header(skb);
1202 skb->protocol = eth_type_trans(skb, vxlan->dev);
1203
1204 /* Ignore packet loops (and multicast echo) */
1205 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1206 goto drop;
1207
1208 /* Re-examine inner Ethernet packet */
1209 if (remote_ip->sa.sa_family == AF_INET) {
1210 oip = ip_hdr(skb);
1211 saddr.sin.sin_addr.s_addr = oip->saddr;
1212 saddr.sa.sa_family = AF_INET;
1213 #if IS_ENABLED(CONFIG_IPV6)
1214 } else {
1215 oip6 = ipv6_hdr(skb);
1216 saddr.sin6.sin6_addr = oip6->saddr;
1217 saddr.sa.sa_family = AF_INET6;
1218 #endif
1219 }
1220
1221 if ((vxlan->flags & VXLAN_F_LEARN) &&
1222 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1223 goto drop;
1224
1225 skb_reset_network_header(skb);
1226
1227 if (oip6)
1228 err = IP6_ECN_decapsulate(oip6, skb);
1229 if (oip)
1230 err = IP_ECN_decapsulate(oip, skb);
1231
1232 if (unlikely(err)) {
1233 if (log_ecn_error) {
1234 if (oip6)
1235 net_info_ratelimited("non-ECT from %pI6\n",
1236 &oip6->saddr);
1237 if (oip)
1238 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1239 &oip->saddr, oip->tos);
1240 }
1241 if (err > 1) {
1242 ++vxlan->dev->stats.rx_frame_errors;
1243 ++vxlan->dev->stats.rx_errors;
1244 goto drop;
1245 }
1246 }
1247
1248 stats = this_cpu_ptr(vxlan->dev->tstats);
1249 u64_stats_update_begin(&stats->syncp);
1250 stats->rx_packets++;
1251 stats->rx_bytes += skb->len;
1252 u64_stats_update_end(&stats->syncp);
1253
1254 netif_rx(skb);
1255
1256 return;
1257 drop:
1258 /* Consume bad packet */
1259 kfree_skb(skb);
1260 }
1261
1262 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1263 {
1264 struct vxlan_dev *vxlan = netdev_priv(dev);
1265 struct arphdr *parp;
1266 u8 *arpptr, *sha;
1267 __be32 sip, tip;
1268 struct neighbour *n;
1269
1270 if (dev->flags & IFF_NOARP)
1271 goto out;
1272
1273 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1274 dev->stats.tx_dropped++;
1275 goto out;
1276 }
1277 parp = arp_hdr(skb);
1278
1279 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1280 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1281 parp->ar_pro != htons(ETH_P_IP) ||
1282 parp->ar_op != htons(ARPOP_REQUEST) ||
1283 parp->ar_hln != dev->addr_len ||
1284 parp->ar_pln != 4)
1285 goto out;
1286 arpptr = (u8 *)parp + sizeof(struct arphdr);
1287 sha = arpptr;
1288 arpptr += dev->addr_len; /* sha */
1289 memcpy(&sip, arpptr, sizeof(sip));
1290 arpptr += sizeof(sip);
1291 arpptr += dev->addr_len; /* tha */
1292 memcpy(&tip, arpptr, sizeof(tip));
1293
1294 if (ipv4_is_loopback(tip) ||
1295 ipv4_is_multicast(tip))
1296 goto out;
1297
1298 n = neigh_lookup(&arp_tbl, &tip, dev);
1299
1300 if (n) {
1301 struct vxlan_fdb *f;
1302 struct sk_buff *reply;
1303
1304 if (!(n->nud_state & NUD_CONNECTED)) {
1305 neigh_release(n);
1306 goto out;
1307 }
1308
1309 f = vxlan_find_mac(vxlan, n->ha);
1310 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1311 /* bridge-local neighbor */
1312 neigh_release(n);
1313 goto out;
1314 }
1315
1316 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1317 n->ha, sha);
1318
1319 neigh_release(n);
1320
1321 if (reply == NULL)
1322 goto out;
1323
1324 skb_reset_mac_header(reply);
1325 __skb_pull(reply, skb_network_offset(reply));
1326 reply->ip_summed = CHECKSUM_UNNECESSARY;
1327 reply->pkt_type = PACKET_HOST;
1328
1329 if (netif_rx_ni(reply) == NET_RX_DROP)
1330 dev->stats.rx_dropped++;
1331 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1332 union vxlan_addr ipa = {
1333 .sin.sin_addr.s_addr = tip,
1334 .sa.sa_family = AF_INET,
1335 };
1336
1337 vxlan_ip_miss(dev, &ipa);
1338 }
1339 out:
1340 consume_skb(skb);
1341 return NETDEV_TX_OK;
1342 }
1343
1344 #if IS_ENABLED(CONFIG_IPV6)
1345
1346 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1347 struct neighbour *n, bool isrouter)
1348 {
1349 struct net_device *dev = request->dev;
1350 struct sk_buff *reply;
1351 struct nd_msg *ns, *na;
1352 struct ipv6hdr *pip6;
1353 u8 *daddr;
1354 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1355 int ns_olen;
1356 int i, len;
1357
1358 if (dev == NULL)
1359 return NULL;
1360
1361 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1362 sizeof(*na) + na_olen + dev->needed_tailroom;
1363 reply = alloc_skb(len, GFP_ATOMIC);
1364 if (reply == NULL)
1365 return NULL;
1366
1367 reply->protocol = htons(ETH_P_IPV6);
1368 reply->dev = dev;
1369 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1370 skb_push(reply, sizeof(struct ethhdr));
1371 skb_set_mac_header(reply, 0);
1372
1373 ns = (struct nd_msg *)skb_transport_header(request);
1374
1375 daddr = eth_hdr(request)->h_source;
1376 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1377 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1378 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1379 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1380 break;
1381 }
1382 }
1383
1384 /* Ethernet header */
1385 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1386 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1387 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1388 reply->protocol = htons(ETH_P_IPV6);
1389
1390 skb_pull(reply, sizeof(struct ethhdr));
1391 skb_set_network_header(reply, 0);
1392 skb_put(reply, sizeof(struct ipv6hdr));
1393
1394 /* IPv6 header */
1395
1396 pip6 = ipv6_hdr(reply);
1397 memset(pip6, 0, sizeof(struct ipv6hdr));
1398 pip6->version = 6;
1399 pip6->priority = ipv6_hdr(request)->priority;
1400 pip6->nexthdr = IPPROTO_ICMPV6;
1401 pip6->hop_limit = 255;
1402 pip6->daddr = ipv6_hdr(request)->saddr;
1403 pip6->saddr = *(struct in6_addr *)n->primary_key;
1404
1405 skb_pull(reply, sizeof(struct ipv6hdr));
1406 skb_set_transport_header(reply, 0);
1407
1408 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1409
1410 /* Neighbor Advertisement */
1411 memset(na, 0, sizeof(*na)+na_olen);
1412 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1413 na->icmph.icmp6_router = isrouter;
1414 na->icmph.icmp6_override = 1;
1415 na->icmph.icmp6_solicited = 1;
1416 na->target = ns->target;
1417 ether_addr_copy(&na->opt[2], n->ha);
1418 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1419 na->opt[1] = na_olen >> 3;
1420
1421 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1422 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1423 csum_partial(na, sizeof(*na)+na_olen, 0));
1424
1425 pip6->payload_len = htons(sizeof(*na)+na_olen);
1426
1427 skb_push(reply, sizeof(struct ipv6hdr));
1428
1429 reply->ip_summed = CHECKSUM_UNNECESSARY;
1430
1431 return reply;
1432 }
1433
1434 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1435 {
1436 struct vxlan_dev *vxlan = netdev_priv(dev);
1437 struct nd_msg *msg;
1438 const struct ipv6hdr *iphdr;
1439 const struct in6_addr *saddr, *daddr;
1440 struct neighbour *n;
1441 struct inet6_dev *in6_dev;
1442
1443 in6_dev = __in6_dev_get(dev);
1444 if (!in6_dev)
1445 goto out;
1446
1447 if (!pskb_may_pull(skb, skb->len))
1448 goto out;
1449
1450 iphdr = ipv6_hdr(skb);
1451 saddr = &iphdr->saddr;
1452 daddr = &iphdr->daddr;
1453
1454 msg = (struct nd_msg *)skb_transport_header(skb);
1455 if (msg->icmph.icmp6_code != 0 ||
1456 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1457 goto out;
1458
1459 if (ipv6_addr_loopback(daddr) ||
1460 ipv6_addr_is_multicast(&msg->target))
1461 goto out;
1462
1463 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1464
1465 if (n) {
1466 struct vxlan_fdb *f;
1467 struct sk_buff *reply;
1468
1469 if (!(n->nud_state & NUD_CONNECTED)) {
1470 neigh_release(n);
1471 goto out;
1472 }
1473
1474 f = vxlan_find_mac(vxlan, n->ha);
1475 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1476 /* bridge-local neighbor */
1477 neigh_release(n);
1478 goto out;
1479 }
1480
1481 reply = vxlan_na_create(skb, n,
1482 !!(f ? f->flags & NTF_ROUTER : 0));
1483
1484 neigh_release(n);
1485
1486 if (reply == NULL)
1487 goto out;
1488
1489 if (netif_rx_ni(reply) == NET_RX_DROP)
1490 dev->stats.rx_dropped++;
1491
1492 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1493 union vxlan_addr ipa = {
1494 .sin6.sin6_addr = msg->target,
1495 .sa.sa_family = AF_INET6,
1496 };
1497
1498 vxlan_ip_miss(dev, &ipa);
1499 }
1500
1501 out:
1502 consume_skb(skb);
1503 return NETDEV_TX_OK;
1504 }
1505 #endif
1506
1507 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1508 {
1509 struct vxlan_dev *vxlan = netdev_priv(dev);
1510 struct neighbour *n;
1511
1512 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1513 return false;
1514
1515 n = NULL;
1516 switch (ntohs(eth_hdr(skb)->h_proto)) {
1517 case ETH_P_IP:
1518 {
1519 struct iphdr *pip;
1520
1521 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1522 return false;
1523 pip = ip_hdr(skb);
1524 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1525 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1526 union vxlan_addr ipa = {
1527 .sin.sin_addr.s_addr = pip->daddr,
1528 .sa.sa_family = AF_INET,
1529 };
1530
1531 vxlan_ip_miss(dev, &ipa);
1532 return false;
1533 }
1534
1535 break;
1536 }
1537 #if IS_ENABLED(CONFIG_IPV6)
1538 case ETH_P_IPV6:
1539 {
1540 struct ipv6hdr *pip6;
1541
1542 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1543 return false;
1544 pip6 = ipv6_hdr(skb);
1545 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1546 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1547 union vxlan_addr ipa = {
1548 .sin6.sin6_addr = pip6->daddr,
1549 .sa.sa_family = AF_INET6,
1550 };
1551
1552 vxlan_ip_miss(dev, &ipa);
1553 return false;
1554 }
1555
1556 break;
1557 }
1558 #endif
1559 default:
1560 return false;
1561 }
1562
1563 if (n) {
1564 bool diff;
1565
1566 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1567 if (diff) {
1568 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1569 dev->addr_len);
1570 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1571 }
1572 neigh_release(n);
1573 return diff;
1574 }
1575
1576 return false;
1577 }
1578
1579 /* Compute source port for outgoing packet
1580 * first choice to use L4 flow hash since it will spread
1581 * better and maybe available from hardware
1582 * secondary choice is to use jhash on the Ethernet header
1583 */
1584 __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1585 {
1586 unsigned int range = (port_max - port_min) + 1;
1587 u32 hash;
1588
1589 hash = skb_get_hash(skb);
1590 if (!hash)
1591 hash = jhash(skb->data, 2 * ETH_ALEN,
1592 (__force u32) skb->protocol);
1593
1594 return htons((((u64) hash * range) >> 32) + port_min);
1595 }
1596 EXPORT_SYMBOL_GPL(vxlan_src_port);
1597
1598 static int handle_offloads(struct sk_buff *skb)
1599 {
1600 if (skb_is_gso(skb)) {
1601 int err = skb_unclone(skb, GFP_ATOMIC);
1602 if (unlikely(err))
1603 return err;
1604
1605 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1606 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1607 skb->ip_summed = CHECKSUM_NONE;
1608
1609 return 0;
1610 }
1611
1612 #if IS_ENABLED(CONFIG_IPV6)
1613 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1614 struct dst_entry *dst, struct sk_buff *skb,
1615 struct net_device *dev, struct in6_addr *saddr,
1616 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1617 __be16 src_port, __be16 dst_port, __be32 vni)
1618 {
1619 struct ipv6hdr *ip6h;
1620 struct vxlanhdr *vxh;
1621 struct udphdr *uh;
1622 int min_headroom;
1623 int err;
1624
1625 if (!skb->encapsulation) {
1626 skb_reset_inner_headers(skb);
1627 skb->encapsulation = 1;
1628 }
1629
1630 skb_scrub_packet(skb, false);
1631
1632 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1633 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1634 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1635
1636 /* Need space for new headers (invalidates iph ptr) */
1637 err = skb_cow_head(skb, min_headroom);
1638 if (unlikely(err))
1639 return err;
1640
1641 if (vlan_tx_tag_present(skb)) {
1642 if (WARN_ON(!__vlan_put_tag(skb,
1643 skb->vlan_proto,
1644 vlan_tx_tag_get(skb))))
1645 return -ENOMEM;
1646
1647 skb->vlan_tci = 0;
1648 }
1649
1650 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1651 vxh->vx_flags = htonl(VXLAN_FLAGS);
1652 vxh->vx_vni = vni;
1653
1654 __skb_push(skb, sizeof(*uh));
1655 skb_reset_transport_header(skb);
1656 uh = udp_hdr(skb);
1657
1658 uh->dest = dst_port;
1659 uh->source = src_port;
1660
1661 uh->len = htons(skb->len);
1662 uh->check = 0;
1663
1664 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1665 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1666 IPSKB_REROUTED);
1667 skb_dst_set(skb, dst);
1668
1669 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1670 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1671 skb->ip_summed = CHECKSUM_UNNECESSARY;
1672 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1673 IPPROTO_UDP, csum);
1674 if (uh->check == 0)
1675 uh->check = CSUM_MANGLED_0;
1676 } else {
1677 skb->ip_summed = CHECKSUM_PARTIAL;
1678 skb->csum_start = skb_transport_header(skb) - skb->head;
1679 skb->csum_offset = offsetof(struct udphdr, check);
1680 uh->check = ~csum_ipv6_magic(saddr, daddr,
1681 skb->len, IPPROTO_UDP, 0);
1682 }
1683
1684 __skb_push(skb, sizeof(*ip6h));
1685 skb_reset_network_header(skb);
1686 ip6h = ipv6_hdr(skb);
1687 ip6h->version = 6;
1688 ip6h->priority = prio;
1689 ip6h->flow_lbl[0] = 0;
1690 ip6h->flow_lbl[1] = 0;
1691 ip6h->flow_lbl[2] = 0;
1692 ip6h->payload_len = htons(skb->len);
1693 ip6h->nexthdr = IPPROTO_UDP;
1694 ip6h->hop_limit = ttl;
1695 ip6h->daddr = *daddr;
1696 ip6h->saddr = *saddr;
1697
1698 err = handle_offloads(skb);
1699 if (err)
1700 return err;
1701
1702 ip6tunnel_xmit(skb, dev);
1703 return 0;
1704 }
1705 #endif
1706
1707 int vxlan_xmit_skb(struct vxlan_sock *vs,
1708 struct rtable *rt, struct sk_buff *skb,
1709 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1710 __be16 src_port, __be16 dst_port, __be32 vni)
1711 {
1712 struct vxlanhdr *vxh;
1713 struct udphdr *uh;
1714 int min_headroom;
1715 int err;
1716
1717 if (!skb->encapsulation) {
1718 skb_reset_inner_headers(skb);
1719 skb->encapsulation = 1;
1720 }
1721
1722 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1723 + VXLAN_HLEN + sizeof(struct iphdr)
1724 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1725
1726 /* Need space for new headers (invalidates iph ptr) */
1727 err = skb_cow_head(skb, min_headroom);
1728 if (unlikely(err))
1729 return err;
1730
1731 if (vlan_tx_tag_present(skb)) {
1732 if (WARN_ON(!__vlan_put_tag(skb,
1733 skb->vlan_proto,
1734 vlan_tx_tag_get(skb))))
1735 return -ENOMEM;
1736
1737 skb->vlan_tci = 0;
1738 }
1739
1740 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1741 vxh->vx_flags = htonl(VXLAN_FLAGS);
1742 vxh->vx_vni = vni;
1743
1744 __skb_push(skb, sizeof(*uh));
1745 skb_reset_transport_header(skb);
1746 uh = udp_hdr(skb);
1747
1748 uh->dest = dst_port;
1749 uh->source = src_port;
1750
1751 uh->len = htons(skb->len);
1752 uh->check = 0;
1753
1754 err = handle_offloads(skb);
1755 if (err)
1756 return err;
1757
1758 return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
1759 tos, ttl, df, false);
1760 }
1761 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1762
1763 /* Bypass encapsulation if the destination is local */
1764 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1765 struct vxlan_dev *dst_vxlan)
1766 {
1767 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1768 union vxlan_addr loopback;
1769 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1770
1771 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1772 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1773 skb->pkt_type = PACKET_HOST;
1774 skb->encapsulation = 0;
1775 skb->dev = dst_vxlan->dev;
1776 __skb_pull(skb, skb_network_offset(skb));
1777
1778 if (remote_ip->sa.sa_family == AF_INET) {
1779 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1780 loopback.sa.sa_family = AF_INET;
1781 #if IS_ENABLED(CONFIG_IPV6)
1782 } else {
1783 loopback.sin6.sin6_addr = in6addr_loopback;
1784 loopback.sa.sa_family = AF_INET6;
1785 #endif
1786 }
1787
1788 if (dst_vxlan->flags & VXLAN_F_LEARN)
1789 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1790
1791 u64_stats_update_begin(&tx_stats->syncp);
1792 tx_stats->tx_packets++;
1793 tx_stats->tx_bytes += skb->len;
1794 u64_stats_update_end(&tx_stats->syncp);
1795
1796 if (netif_rx(skb) == NET_RX_SUCCESS) {
1797 u64_stats_update_begin(&rx_stats->syncp);
1798 rx_stats->rx_packets++;
1799 rx_stats->rx_bytes += skb->len;
1800 u64_stats_update_end(&rx_stats->syncp);
1801 } else {
1802 skb->dev->stats.rx_dropped++;
1803 }
1804 }
1805
1806 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1807 struct vxlan_rdst *rdst, bool did_rsc)
1808 {
1809 struct vxlan_dev *vxlan = netdev_priv(dev);
1810 struct rtable *rt = NULL;
1811 const struct iphdr *old_iph;
1812 struct flowi4 fl4;
1813 union vxlan_addr *dst;
1814 __be16 src_port = 0, dst_port;
1815 u32 vni;
1816 __be16 df = 0;
1817 __u8 tos, ttl;
1818 int err;
1819
1820 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1821 vni = rdst->remote_vni;
1822 dst = &rdst->remote_ip;
1823
1824 if (vxlan_addr_any(dst)) {
1825 if (did_rsc) {
1826 /* short-circuited back to local bridge */
1827 vxlan_encap_bypass(skb, vxlan, vxlan);
1828 return;
1829 }
1830 goto drop;
1831 }
1832
1833 old_iph = ip_hdr(skb);
1834
1835 ttl = vxlan->ttl;
1836 if (!ttl && vxlan_addr_multicast(dst))
1837 ttl = 1;
1838
1839 tos = vxlan->tos;
1840 if (tos == 1)
1841 tos = ip_tunnel_get_dsfield(old_iph, skb);
1842
1843 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1844
1845 if (dst->sa.sa_family == AF_INET) {
1846 memset(&fl4, 0, sizeof(fl4));
1847 fl4.flowi4_oif = rdst->remote_ifindex;
1848 fl4.flowi4_tos = RT_TOS(tos);
1849 fl4.daddr = dst->sin.sin_addr.s_addr;
1850 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1851
1852 rt = ip_route_output_key(dev_net(dev), &fl4);
1853 if (IS_ERR(rt)) {
1854 netdev_dbg(dev, "no route to %pI4\n",
1855 &dst->sin.sin_addr.s_addr);
1856 dev->stats.tx_carrier_errors++;
1857 goto tx_error;
1858 }
1859
1860 if (rt->dst.dev == dev) {
1861 netdev_dbg(dev, "circular route to %pI4\n",
1862 &dst->sin.sin_addr.s_addr);
1863 dev->stats.collisions++;
1864 goto rt_tx_error;
1865 }
1866
1867 /* Bypass encapsulation if the destination is local */
1868 if (rt->rt_flags & RTCF_LOCAL &&
1869 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1870 struct vxlan_dev *dst_vxlan;
1871
1872 ip_rt_put(rt);
1873 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1874 if (!dst_vxlan)
1875 goto tx_error;
1876 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1877 return;
1878 }
1879
1880 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1881 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1882
1883 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1884 fl4.saddr, dst->sin.sin_addr.s_addr,
1885 tos, ttl, df, src_port, dst_port,
1886 htonl(vni << 8));
1887
1888 if (err < 0)
1889 goto rt_tx_error;
1890 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1891 #if IS_ENABLED(CONFIG_IPV6)
1892 } else {
1893 struct sock *sk = vxlan->vn_sock->sock->sk;
1894 struct dst_entry *ndst;
1895 struct flowi6 fl6;
1896 u32 flags;
1897
1898 memset(&fl6, 0, sizeof(fl6));
1899 fl6.flowi6_oif = rdst->remote_ifindex;
1900 fl6.daddr = dst->sin6.sin6_addr;
1901 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1902 fl6.flowi6_proto = IPPROTO_UDP;
1903
1904 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1905 netdev_dbg(dev, "no route to %pI6\n",
1906 &dst->sin6.sin6_addr);
1907 dev->stats.tx_carrier_errors++;
1908 goto tx_error;
1909 }
1910
1911 if (ndst->dev == dev) {
1912 netdev_dbg(dev, "circular route to %pI6\n",
1913 &dst->sin6.sin6_addr);
1914 dst_release(ndst);
1915 dev->stats.collisions++;
1916 goto tx_error;
1917 }
1918
1919 /* Bypass encapsulation if the destination is local */
1920 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1921 if (flags & RTF_LOCAL &&
1922 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1923 struct vxlan_dev *dst_vxlan;
1924
1925 dst_release(ndst);
1926 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1927 if (!dst_vxlan)
1928 goto tx_error;
1929 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1930 return;
1931 }
1932
1933 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1934
1935 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1936 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1937 src_port, dst_port, htonl(vni << 8));
1938 #endif
1939 }
1940
1941 return;
1942
1943 drop:
1944 dev->stats.tx_dropped++;
1945 goto tx_free;
1946
1947 rt_tx_error:
1948 ip_rt_put(rt);
1949 tx_error:
1950 dev->stats.tx_errors++;
1951 tx_free:
1952 dev_kfree_skb(skb);
1953 }
1954
1955 /* Transmit local packets over Vxlan
1956 *
1957 * Outer IP header inherits ECN and DF from inner header.
1958 * Outer UDP destination is the VXLAN assigned port.
1959 * source port is based on hash of flow
1960 */
1961 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1962 {
1963 struct vxlan_dev *vxlan = netdev_priv(dev);
1964 struct ethhdr *eth;
1965 bool did_rsc = false;
1966 struct vxlan_rdst *rdst, *fdst = NULL;
1967 struct vxlan_fdb *f;
1968
1969 skb_reset_mac_header(skb);
1970 eth = eth_hdr(skb);
1971
1972 if ((vxlan->flags & VXLAN_F_PROXY)) {
1973 if (ntohs(eth->h_proto) == ETH_P_ARP)
1974 return arp_reduce(dev, skb);
1975 #if IS_ENABLED(CONFIG_IPV6)
1976 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1977 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1978 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1979 struct nd_msg *msg;
1980
1981 msg = (struct nd_msg *)skb_transport_header(skb);
1982 if (msg->icmph.icmp6_code == 0 &&
1983 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1984 return neigh_reduce(dev, skb);
1985 }
1986 #endif
1987 }
1988
1989 f = vxlan_find_mac(vxlan, eth->h_dest);
1990 did_rsc = false;
1991
1992 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1993 (ntohs(eth->h_proto) == ETH_P_IP ||
1994 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1995 did_rsc = route_shortcircuit(dev, skb);
1996 if (did_rsc)
1997 f = vxlan_find_mac(vxlan, eth->h_dest);
1998 }
1999
2000 if (f == NULL) {
2001 f = vxlan_find_mac(vxlan, all_zeros_mac);
2002 if (f == NULL) {
2003 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2004 !is_multicast_ether_addr(eth->h_dest))
2005 vxlan_fdb_miss(vxlan, eth->h_dest);
2006
2007 dev->stats.tx_dropped++;
2008 kfree_skb(skb);
2009 return NETDEV_TX_OK;
2010 }
2011 }
2012
2013 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2014 struct sk_buff *skb1;
2015
2016 if (!fdst) {
2017 fdst = rdst;
2018 continue;
2019 }
2020 skb1 = skb_clone(skb, GFP_ATOMIC);
2021 if (skb1)
2022 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2023 }
2024
2025 if (fdst)
2026 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2027 else
2028 kfree_skb(skb);
2029 return NETDEV_TX_OK;
2030 }
2031
2032 /* Walk the forwarding table and purge stale entries */
2033 static void vxlan_cleanup(unsigned long arg)
2034 {
2035 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2036 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2037 unsigned int h;
2038
2039 if (!netif_running(vxlan->dev))
2040 return;
2041
2042 spin_lock_bh(&vxlan->hash_lock);
2043 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2044 struct hlist_node *p, *n;
2045 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2046 struct vxlan_fdb *f
2047 = container_of(p, struct vxlan_fdb, hlist);
2048 unsigned long timeout;
2049
2050 if (f->state & NUD_PERMANENT)
2051 continue;
2052
2053 timeout = f->used + vxlan->age_interval * HZ;
2054 if (time_before_eq(timeout, jiffies)) {
2055 netdev_dbg(vxlan->dev,
2056 "garbage collect %pM\n",
2057 f->eth_addr);
2058 f->state = NUD_STALE;
2059 vxlan_fdb_destroy(vxlan, f);
2060 } else if (time_before(timeout, next_timer))
2061 next_timer = timeout;
2062 }
2063 }
2064 spin_unlock_bh(&vxlan->hash_lock);
2065
2066 mod_timer(&vxlan->age_timer, next_timer);
2067 }
2068
2069 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2070 {
2071 __u32 vni = vxlan->default_dst.remote_vni;
2072
2073 vxlan->vn_sock = vs;
2074 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2075 }
2076
2077 /* Setup stats when device is created */
2078 static int vxlan_init(struct net_device *dev)
2079 {
2080 struct vxlan_dev *vxlan = netdev_priv(dev);
2081 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2082 struct vxlan_sock *vs;
2083
2084 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2085 if (!dev->tstats)
2086 return -ENOMEM;
2087
2088 spin_lock(&vn->sock_lock);
2089 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
2090 if (vs) {
2091 /* If we have a socket with same port already, reuse it */
2092 atomic_inc(&vs->refcnt);
2093 vxlan_vs_add_dev(vs, vxlan);
2094 } else {
2095 /* otherwise make new socket outside of RTNL */
2096 dev_hold(dev);
2097 queue_work(vxlan_wq, &vxlan->sock_work);
2098 }
2099 spin_unlock(&vn->sock_lock);
2100
2101 return 0;
2102 }
2103
2104 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2105 {
2106 struct vxlan_fdb *f;
2107
2108 spin_lock_bh(&vxlan->hash_lock);
2109 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2110 if (f)
2111 vxlan_fdb_destroy(vxlan, f);
2112 spin_unlock_bh(&vxlan->hash_lock);
2113 }
2114
2115 static void vxlan_uninit(struct net_device *dev)
2116 {
2117 struct vxlan_dev *vxlan = netdev_priv(dev);
2118 struct vxlan_sock *vs = vxlan->vn_sock;
2119
2120 vxlan_fdb_delete_default(vxlan);
2121
2122 if (vs)
2123 vxlan_sock_release(vs);
2124 free_percpu(dev->tstats);
2125 }
2126
2127 /* Start ageing timer and join group when device is brought up */
2128 static int vxlan_open(struct net_device *dev)
2129 {
2130 struct vxlan_dev *vxlan = netdev_priv(dev);
2131 struct vxlan_sock *vs = vxlan->vn_sock;
2132
2133 /* socket hasn't been created */
2134 if (!vs)
2135 return -ENOTCONN;
2136
2137 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2138 vxlan_sock_hold(vs);
2139 dev_hold(dev);
2140 queue_work(vxlan_wq, &vxlan->igmp_join);
2141 }
2142
2143 if (vxlan->age_interval)
2144 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2145
2146 return 0;
2147 }
2148
2149 /* Purge the forwarding table */
2150 static void vxlan_flush(struct vxlan_dev *vxlan)
2151 {
2152 unsigned int h;
2153
2154 spin_lock_bh(&vxlan->hash_lock);
2155 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2156 struct hlist_node *p, *n;
2157 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2158 struct vxlan_fdb *f
2159 = container_of(p, struct vxlan_fdb, hlist);
2160 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2161 if (!is_zero_ether_addr(f->eth_addr))
2162 vxlan_fdb_destroy(vxlan, f);
2163 }
2164 }
2165 spin_unlock_bh(&vxlan->hash_lock);
2166 }
2167
2168 /* Cleanup timer and forwarding table on shutdown */
2169 static int vxlan_stop(struct net_device *dev)
2170 {
2171 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2172 struct vxlan_dev *vxlan = netdev_priv(dev);
2173 struct vxlan_sock *vs = vxlan->vn_sock;
2174
2175 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2176 !vxlan_group_used(vn, vxlan)) {
2177 vxlan_sock_hold(vs);
2178 dev_hold(dev);
2179 queue_work(vxlan_wq, &vxlan->igmp_leave);
2180 }
2181
2182 del_timer_sync(&vxlan->age_timer);
2183
2184 vxlan_flush(vxlan);
2185
2186 return 0;
2187 }
2188
2189 /* Stub, nothing needs to be done. */
2190 static void vxlan_set_multicast_list(struct net_device *dev)
2191 {
2192 }
2193
2194 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2195 {
2196 struct vxlan_dev *vxlan = netdev_priv(dev);
2197 struct vxlan_rdst *dst = &vxlan->default_dst;
2198 struct net_device *lowerdev;
2199 int max_mtu;
2200
2201 lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex);
2202 if (lowerdev == NULL)
2203 return eth_change_mtu(dev, new_mtu);
2204
2205 if (dst->remote_ip.sa.sa_family == AF_INET6)
2206 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2207 else
2208 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2209
2210 if (new_mtu < 68 || new_mtu > max_mtu)
2211 return -EINVAL;
2212
2213 dev->mtu = new_mtu;
2214 return 0;
2215 }
2216
2217 static const struct net_device_ops vxlan_netdev_ops = {
2218 .ndo_init = vxlan_init,
2219 .ndo_uninit = vxlan_uninit,
2220 .ndo_open = vxlan_open,
2221 .ndo_stop = vxlan_stop,
2222 .ndo_start_xmit = vxlan_xmit,
2223 .ndo_get_stats64 = ip_tunnel_get_stats64,
2224 .ndo_set_rx_mode = vxlan_set_multicast_list,
2225 .ndo_change_mtu = vxlan_change_mtu,
2226 .ndo_validate_addr = eth_validate_addr,
2227 .ndo_set_mac_address = eth_mac_addr,
2228 .ndo_fdb_add = vxlan_fdb_add,
2229 .ndo_fdb_del = vxlan_fdb_delete,
2230 .ndo_fdb_dump = vxlan_fdb_dump,
2231 };
2232
2233 /* Info for udev, that this is a virtual tunnel endpoint */
2234 static struct device_type vxlan_type = {
2235 .name = "vxlan",
2236 };
2237
2238 /* Calls the ndo_add_vxlan_port of the caller in order to
2239 * supply the listening VXLAN udp ports. Callers are expected
2240 * to implement the ndo_add_vxlan_port.
2241 */
2242 void vxlan_get_rx_port(struct net_device *dev)
2243 {
2244 struct vxlan_sock *vs;
2245 struct net *net = dev_net(dev);
2246 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2247 sa_family_t sa_family;
2248 __be16 port;
2249 unsigned int i;
2250
2251 spin_lock(&vn->sock_lock);
2252 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2253 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2254 port = inet_sk(vs->sock->sk)->inet_sport;
2255 sa_family = vs->sock->sk->sk_family;
2256 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2257 port);
2258 }
2259 }
2260 spin_unlock(&vn->sock_lock);
2261 }
2262 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2263
2264 /* Initialize the device structure. */
2265 static void vxlan_setup(struct net_device *dev)
2266 {
2267 struct vxlan_dev *vxlan = netdev_priv(dev);
2268 unsigned int h;
2269 int low, high;
2270
2271 eth_hw_addr_random(dev);
2272 ether_setup(dev);
2273 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2274 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2275 else
2276 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2277
2278 dev->netdev_ops = &vxlan_netdev_ops;
2279 dev->destructor = free_netdev;
2280 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2281
2282 dev->tx_queue_len = 0;
2283 dev->features |= NETIF_F_LLTX;
2284 dev->features |= NETIF_F_NETNS_LOCAL;
2285 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2286 dev->features |= NETIF_F_RXCSUM;
2287 dev->features |= NETIF_F_GSO_SOFTWARE;
2288
2289 dev->vlan_features = dev->features;
2290 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2291 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2292 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2293 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2294 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2295 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2296
2297 INIT_LIST_HEAD(&vxlan->next);
2298 spin_lock_init(&vxlan->hash_lock);
2299 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2300 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2301 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2302
2303 init_timer_deferrable(&vxlan->age_timer);
2304 vxlan->age_timer.function = vxlan_cleanup;
2305 vxlan->age_timer.data = (unsigned long) vxlan;
2306
2307 inet_get_local_port_range(dev_net(dev), &low, &high);
2308 vxlan->port_min = low;
2309 vxlan->port_max = high;
2310 vxlan->dst_port = htons(vxlan_port);
2311
2312 vxlan->dev = dev;
2313
2314 for (h = 0; h < FDB_HASH_SIZE; ++h)
2315 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2316 }
2317
2318 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2319 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2320 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2321 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2322 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2323 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2324 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2325 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2326 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2327 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2328 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2329 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2330 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2331 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2332 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2333 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2334 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2335 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2336 };
2337
2338 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2339 {
2340 if (tb[IFLA_ADDRESS]) {
2341 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2342 pr_debug("invalid link address (not ethernet)\n");
2343 return -EINVAL;
2344 }
2345
2346 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2347 pr_debug("invalid all zero ethernet address\n");
2348 return -EADDRNOTAVAIL;
2349 }
2350 }
2351
2352 if (!data)
2353 return -EINVAL;
2354
2355 if (data[IFLA_VXLAN_ID]) {
2356 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2357 if (id >= VXLAN_VID_MASK)
2358 return -ERANGE;
2359 }
2360
2361 if (data[IFLA_VXLAN_PORT_RANGE]) {
2362 const struct ifla_vxlan_port_range *p
2363 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2364
2365 if (ntohs(p->high) < ntohs(p->low)) {
2366 pr_debug("port range %u .. %u not valid\n",
2367 ntohs(p->low), ntohs(p->high));
2368 return -EINVAL;
2369 }
2370 }
2371
2372 return 0;
2373 }
2374
2375 static void vxlan_get_drvinfo(struct net_device *netdev,
2376 struct ethtool_drvinfo *drvinfo)
2377 {
2378 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2379 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2380 }
2381
2382 static const struct ethtool_ops vxlan_ethtool_ops = {
2383 .get_drvinfo = vxlan_get_drvinfo,
2384 .get_link = ethtool_op_get_link,
2385 };
2386
2387 static void vxlan_del_work(struct work_struct *work)
2388 {
2389 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2390
2391 sk_release_kernel(vs->sock->sk);
2392 kfree_rcu(vs, rcu);
2393 }
2394
2395 #if IS_ENABLED(CONFIG_IPV6)
2396 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2397 * could be used for both IPv4 and IPv6 communications, but
2398 * users may set bindv6only=1.
2399 */
2400 static struct socket *create_v6_sock(struct net *net, __be16 port)
2401 {
2402 struct sock *sk;
2403 struct socket *sock;
2404 struct sockaddr_in6 vxlan_addr = {
2405 .sin6_family = AF_INET6,
2406 .sin6_port = port,
2407 };
2408 int rc, val = 1;
2409
2410 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2411 if (rc < 0) {
2412 pr_debug("UDPv6 socket create failed\n");
2413 return ERR_PTR(rc);
2414 }
2415
2416 /* Put in proper namespace */
2417 sk = sock->sk;
2418 sk_change_net(sk, net);
2419
2420 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2421 (char *)&val, sizeof(val));
2422 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2423 sizeof(struct sockaddr_in6));
2424 if (rc < 0) {
2425 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2426 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2427 sk_release_kernel(sk);
2428 return ERR_PTR(rc);
2429 }
2430 /* At this point, IPv6 module should have been loaded in
2431 * sock_create_kern().
2432 */
2433 BUG_ON(!ipv6_stub);
2434
2435 /* Disable multicast loopback */
2436 inet_sk(sk)->mc_loop = 0;
2437 return sock;
2438 }
2439
2440 #else
2441
2442 static struct socket *create_v6_sock(struct net *net, __be16 port)
2443 {
2444 return ERR_PTR(-EPFNOSUPPORT);
2445 }
2446 #endif
2447
2448 static struct socket *create_v4_sock(struct net *net, __be16 port)
2449 {
2450 struct sock *sk;
2451 struct socket *sock;
2452 struct sockaddr_in vxlan_addr = {
2453 .sin_family = AF_INET,
2454 .sin_addr.s_addr = htonl(INADDR_ANY),
2455 .sin_port = port,
2456 };
2457 int rc;
2458
2459 /* Create UDP socket for encapsulation receive. */
2460 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2461 if (rc < 0) {
2462 pr_debug("UDP socket create failed\n");
2463 return ERR_PTR(rc);
2464 }
2465
2466 /* Put in proper namespace */
2467 sk = sock->sk;
2468 sk_change_net(sk, net);
2469
2470 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2471 sizeof(vxlan_addr));
2472 if (rc < 0) {
2473 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2474 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2475 sk_release_kernel(sk);
2476 return ERR_PTR(rc);
2477 }
2478
2479 /* Disable multicast loopback */
2480 inet_sk(sk)->mc_loop = 0;
2481 return sock;
2482 }
2483
2484 /* Create new listen socket if needed */
2485 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2486 vxlan_rcv_t *rcv, void *data, bool ipv6)
2487 {
2488 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2489 struct vxlan_sock *vs;
2490 struct socket *sock;
2491 struct sock *sk;
2492 unsigned int h;
2493
2494 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2495 if (!vs)
2496 return ERR_PTR(-ENOMEM);
2497
2498 for (h = 0; h < VNI_HASH_SIZE; ++h)
2499 INIT_HLIST_HEAD(&vs->vni_list[h]);
2500
2501 INIT_WORK(&vs->del_work, vxlan_del_work);
2502
2503 if (ipv6)
2504 sock = create_v6_sock(net, port);
2505 else
2506 sock = create_v4_sock(net, port);
2507 if (IS_ERR(sock)) {
2508 kfree(vs);
2509 return ERR_CAST(sock);
2510 }
2511
2512 vs->sock = sock;
2513 sk = sock->sk;
2514 atomic_set(&vs->refcnt, 1);
2515 vs->rcv = rcv;
2516 vs->data = data;
2517 rcu_assign_sk_user_data(vs->sock->sk, vs);
2518
2519 /* Initialize the vxlan udp offloads structure */
2520 vs->udp_offloads.port = port;
2521 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2522 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2523
2524 spin_lock(&vn->sock_lock);
2525 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2526 vxlan_notify_add_rx_port(vs);
2527 spin_unlock(&vn->sock_lock);
2528
2529 /* Mark socket as an encapsulation socket. */
2530 udp_sk(sk)->encap_type = 1;
2531 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2532 #if IS_ENABLED(CONFIG_IPV6)
2533 if (ipv6)
2534 ipv6_stub->udpv6_encap_enable();
2535 else
2536 #endif
2537 udp_encap_enable();
2538
2539 return vs;
2540 }
2541
2542 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2543 vxlan_rcv_t *rcv, void *data,
2544 bool no_share, bool ipv6)
2545 {
2546 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2547 struct vxlan_sock *vs;
2548
2549 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2550 if (!IS_ERR(vs))
2551 return vs;
2552
2553 if (no_share) /* Return error if sharing is not allowed. */
2554 return vs;
2555
2556 spin_lock(&vn->sock_lock);
2557 vs = vxlan_find_sock(net, port);
2558 if (vs) {
2559 if (vs->rcv == rcv)
2560 atomic_inc(&vs->refcnt);
2561 else
2562 vs = ERR_PTR(-EBUSY);
2563 }
2564 spin_unlock(&vn->sock_lock);
2565
2566 if (!vs)
2567 vs = ERR_PTR(-EINVAL);
2568
2569 return vs;
2570 }
2571 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2572
2573 /* Scheduled at device creation to bind to a socket */
2574 static void vxlan_sock_work(struct work_struct *work)
2575 {
2576 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2577 struct net *net = dev_net(vxlan->dev);
2578 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2579 __be16 port = vxlan->dst_port;
2580 struct vxlan_sock *nvs;
2581
2582 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2583 spin_lock(&vn->sock_lock);
2584 if (!IS_ERR(nvs))
2585 vxlan_vs_add_dev(nvs, vxlan);
2586 spin_unlock(&vn->sock_lock);
2587
2588 dev_put(vxlan->dev);
2589 }
2590
2591 static int vxlan_newlink(struct net *net, struct net_device *dev,
2592 struct nlattr *tb[], struct nlattr *data[])
2593 {
2594 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2595 struct vxlan_dev *vxlan = netdev_priv(dev);
2596 struct vxlan_rdst *dst = &vxlan->default_dst;
2597 __u32 vni;
2598 int err;
2599 bool use_ipv6 = false;
2600
2601 if (!data[IFLA_VXLAN_ID])
2602 return -EINVAL;
2603
2604 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2605 dst->remote_vni = vni;
2606
2607 /* Unless IPv6 is explicitly requested, assume IPv4 */
2608 dst->remote_ip.sa.sa_family = AF_INET;
2609 if (data[IFLA_VXLAN_GROUP]) {
2610 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2611 } else if (data[IFLA_VXLAN_GROUP6]) {
2612 if (!IS_ENABLED(CONFIG_IPV6))
2613 return -EPFNOSUPPORT;
2614
2615 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2616 sizeof(struct in6_addr));
2617 dst->remote_ip.sa.sa_family = AF_INET6;
2618 use_ipv6 = true;
2619 }
2620
2621 if (data[IFLA_VXLAN_LOCAL]) {
2622 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2623 vxlan->saddr.sa.sa_family = AF_INET;
2624 } else if (data[IFLA_VXLAN_LOCAL6]) {
2625 if (!IS_ENABLED(CONFIG_IPV6))
2626 return -EPFNOSUPPORT;
2627
2628 /* TODO: respect scope id */
2629 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2630 sizeof(struct in6_addr));
2631 vxlan->saddr.sa.sa_family = AF_INET6;
2632 use_ipv6 = true;
2633 }
2634
2635 if (data[IFLA_VXLAN_LINK] &&
2636 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2637 struct net_device *lowerdev
2638 = __dev_get_by_index(net, dst->remote_ifindex);
2639
2640 if (!lowerdev) {
2641 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2642 return -ENODEV;
2643 }
2644
2645 #if IS_ENABLED(CONFIG_IPV6)
2646 if (use_ipv6) {
2647 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2648 if (idev && idev->cnf.disable_ipv6) {
2649 pr_info("IPv6 is disabled via sysctl\n");
2650 return -EPERM;
2651 }
2652 vxlan->flags |= VXLAN_F_IPV6;
2653 }
2654 #endif
2655
2656 if (!tb[IFLA_MTU])
2657 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2658
2659 /* update header length based on lower device */
2660 dev->hard_header_len = lowerdev->hard_header_len +
2661 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2662 } else if (use_ipv6)
2663 vxlan->flags |= VXLAN_F_IPV6;
2664
2665 if (data[IFLA_VXLAN_TOS])
2666 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2667
2668 if (data[IFLA_VXLAN_TTL])
2669 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2670
2671 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2672 vxlan->flags |= VXLAN_F_LEARN;
2673
2674 if (data[IFLA_VXLAN_AGEING])
2675 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2676 else
2677 vxlan->age_interval = FDB_AGE_DEFAULT;
2678
2679 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2680 vxlan->flags |= VXLAN_F_PROXY;
2681
2682 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2683 vxlan->flags |= VXLAN_F_RSC;
2684
2685 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2686 vxlan->flags |= VXLAN_F_L2MISS;
2687
2688 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2689 vxlan->flags |= VXLAN_F_L3MISS;
2690
2691 if (data[IFLA_VXLAN_LIMIT])
2692 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2693
2694 if (data[IFLA_VXLAN_PORT_RANGE]) {
2695 const struct ifla_vxlan_port_range *p
2696 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2697 vxlan->port_min = ntohs(p->low);
2698 vxlan->port_max = ntohs(p->high);
2699 }
2700
2701 if (data[IFLA_VXLAN_PORT])
2702 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2703
2704 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2705 pr_info("duplicate VNI %u\n", vni);
2706 return -EEXIST;
2707 }
2708
2709 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2710
2711 /* create an fdb entry for a valid default destination */
2712 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2713 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2714 &vxlan->default_dst.remote_ip,
2715 NUD_REACHABLE|NUD_PERMANENT,
2716 NLM_F_EXCL|NLM_F_CREATE,
2717 vxlan->dst_port,
2718 vxlan->default_dst.remote_vni,
2719 vxlan->default_dst.remote_ifindex,
2720 NTF_SELF);
2721 if (err)
2722 return err;
2723 }
2724
2725 err = register_netdevice(dev);
2726 if (err) {
2727 vxlan_fdb_delete_default(vxlan);
2728 return err;
2729 }
2730
2731 list_add(&vxlan->next, &vn->vxlan_list);
2732
2733 return 0;
2734 }
2735
2736 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2737 {
2738 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2739 struct vxlan_dev *vxlan = netdev_priv(dev);
2740
2741 spin_lock(&vn->sock_lock);
2742 if (!hlist_unhashed(&vxlan->hlist))
2743 hlist_del_rcu(&vxlan->hlist);
2744 spin_unlock(&vn->sock_lock);
2745
2746 list_del(&vxlan->next);
2747 unregister_netdevice_queue(dev, head);
2748 }
2749
2750 static size_t vxlan_get_size(const struct net_device *dev)
2751 {
2752
2753 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2754 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2755 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2756 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2757 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2758 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2759 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2760 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2761 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2762 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2763 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2764 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2765 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2766 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2767 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2768 0;
2769 }
2770
2771 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2772 {
2773 const struct vxlan_dev *vxlan = netdev_priv(dev);
2774 const struct vxlan_rdst *dst = &vxlan->default_dst;
2775 struct ifla_vxlan_port_range ports = {
2776 .low = htons(vxlan->port_min),
2777 .high = htons(vxlan->port_max),
2778 };
2779
2780 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2781 goto nla_put_failure;
2782
2783 if (!vxlan_addr_any(&dst->remote_ip)) {
2784 if (dst->remote_ip.sa.sa_family == AF_INET) {
2785 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2786 dst->remote_ip.sin.sin_addr.s_addr))
2787 goto nla_put_failure;
2788 #if IS_ENABLED(CONFIG_IPV6)
2789 } else {
2790 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2791 &dst->remote_ip.sin6.sin6_addr))
2792 goto nla_put_failure;
2793 #endif
2794 }
2795 }
2796
2797 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2798 goto nla_put_failure;
2799
2800 if (!vxlan_addr_any(&vxlan->saddr)) {
2801 if (vxlan->saddr.sa.sa_family == AF_INET) {
2802 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2803 vxlan->saddr.sin.sin_addr.s_addr))
2804 goto nla_put_failure;
2805 #if IS_ENABLED(CONFIG_IPV6)
2806 } else {
2807 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2808 &vxlan->saddr.sin6.sin6_addr))
2809 goto nla_put_failure;
2810 #endif
2811 }
2812 }
2813
2814 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2815 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2816 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2817 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2818 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2819 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2820 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2821 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2822 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2823 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2824 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2825 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2826 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2827 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2828 goto nla_put_failure;
2829
2830 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2831 goto nla_put_failure;
2832
2833 return 0;
2834
2835 nla_put_failure:
2836 return -EMSGSIZE;
2837 }
2838
2839 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2840 .kind = "vxlan",
2841 .maxtype = IFLA_VXLAN_MAX,
2842 .policy = vxlan_policy,
2843 .priv_size = sizeof(struct vxlan_dev),
2844 .setup = vxlan_setup,
2845 .validate = vxlan_validate,
2846 .newlink = vxlan_newlink,
2847 .dellink = vxlan_dellink,
2848 .get_size = vxlan_get_size,
2849 .fill_info = vxlan_fill_info,
2850 };
2851
2852 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2853 struct net_device *dev)
2854 {
2855 struct vxlan_dev *vxlan, *next;
2856 LIST_HEAD(list_kill);
2857
2858 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2859 struct vxlan_rdst *dst = &vxlan->default_dst;
2860
2861 /* In case we created vxlan device with carrier
2862 * and we loose the carrier due to module unload
2863 * we also need to remove vxlan device. In other
2864 * cases, it's not necessary and remote_ifindex
2865 * is 0 here, so no matches.
2866 */
2867 if (dst->remote_ifindex == dev->ifindex)
2868 vxlan_dellink(vxlan->dev, &list_kill);
2869 }
2870
2871 unregister_netdevice_many(&list_kill);
2872 }
2873
2874 static int vxlan_lowerdev_event(struct notifier_block *unused,
2875 unsigned long event, void *ptr)
2876 {
2877 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2878 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2879
2880 if (event == NETDEV_UNREGISTER)
2881 vxlan_handle_lowerdev_unregister(vn, dev);
2882
2883 return NOTIFY_DONE;
2884 }
2885
2886 static struct notifier_block vxlan_notifier_block __read_mostly = {
2887 .notifier_call = vxlan_lowerdev_event,
2888 };
2889
2890 static __net_init int vxlan_init_net(struct net *net)
2891 {
2892 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2893 unsigned int h;
2894
2895 INIT_LIST_HEAD(&vn->vxlan_list);
2896 spin_lock_init(&vn->sock_lock);
2897
2898 for (h = 0; h < PORT_HASH_SIZE; ++h)
2899 INIT_HLIST_HEAD(&vn->sock_list[h]);
2900
2901 return 0;
2902 }
2903
2904 static struct pernet_operations vxlan_net_ops = {
2905 .init = vxlan_init_net,
2906 .id = &vxlan_net_id,
2907 .size = sizeof(struct vxlan_net),
2908 };
2909
2910 static int __init vxlan_init_module(void)
2911 {
2912 int rc;
2913
2914 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2915 if (!vxlan_wq)
2916 return -ENOMEM;
2917
2918 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2919
2920 rc = register_pernet_subsys(&vxlan_net_ops);
2921 if (rc)
2922 goto out1;
2923
2924 rc = register_netdevice_notifier(&vxlan_notifier_block);
2925 if (rc)
2926 goto out2;
2927
2928 rc = rtnl_link_register(&vxlan_link_ops);
2929 if (rc)
2930 goto out3;
2931
2932 return 0;
2933 out3:
2934 unregister_netdevice_notifier(&vxlan_notifier_block);
2935 out2:
2936 unregister_pernet_subsys(&vxlan_net_ops);
2937 out1:
2938 destroy_workqueue(vxlan_wq);
2939 return rc;
2940 }
2941 late_initcall(vxlan_init_module);
2942
2943 static void __exit vxlan_cleanup_module(void)
2944 {
2945 rtnl_link_unregister(&vxlan_link_ops);
2946 unregister_netdevice_notifier(&vxlan_notifier_block);
2947 destroy_workqueue(vxlan_wq);
2948 unregister_pernet_subsys(&vxlan_net_ops);
2949 /* rcu_barrier() is called by netns */
2950 }
2951 module_exit(vxlan_cleanup_module);
2952
2953 MODULE_LICENSE("GPL");
2954 MODULE_VERSION(VXLAN_VERSION);
2955 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2956 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2957 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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