]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/net/vxlan.c
projects / mirror_ubuntu-zesty-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'master-2014-11-04' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...
[mirror_ubuntu-zesty-kernel.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
47 #include <net/ipv6.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
51 #endif
52
53 #define VXLAN_VERSION "0.1"
54
55 #define PORT_HASH_BITS 8
56 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
57 #define VNI_HASH_BITS 10
58 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59 #define FDB_HASH_BITS 8
60 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61 #define FDB_AGE_DEFAULT 300 /* 5 min */
62 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
63
64 #define VXLAN_N_VID (1u << 24)
65 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
66 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
67
68 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
69
70 /* VXLAN protocol header */
71 struct vxlanhdr {
72 __be32 vx_flags;
73 __be32 vx_vni;
74 };
75
76 /* UDP port for VXLAN traffic.
77 * The IANA assigned port is 4789, but the Linux default is 8472
78 * for compatibility with early adopters.
79 */
80 static unsigned short vxlan_port __read_mostly = 8472;
81 module_param_named(udp_port, vxlan_port, ushort, 0444);
82 MODULE_PARM_DESC(udp_port, "Destination UDP port");
83
84 static bool log_ecn_error = true;
85 module_param(log_ecn_error, bool, 0644);
86 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
87
88 static int vxlan_net_id;
89
90 static const u8 all_zeros_mac[ETH_ALEN];
91
92 /* per-network namespace private data for this module */
93 struct vxlan_net {
94 struct list_head vxlan_list;
95 struct hlist_head sock_list[PORT_HASH_SIZE];
96 spinlock_t sock_lock;
97 };
98
99 union vxlan_addr {
100 struct sockaddr_in sin;
101 struct sockaddr_in6 sin6;
102 struct sockaddr sa;
103 };
104
105 struct vxlan_rdst {
106 union vxlan_addr remote_ip;
107 __be16 remote_port;
108 u32 remote_vni;
109 u32 remote_ifindex;
110 struct list_head list;
111 struct rcu_head rcu;
112 };
113
114 /* Forwarding table entry */
115 struct vxlan_fdb {
116 struct hlist_node hlist; /* linked list of entries */
117 struct rcu_head rcu;
118 unsigned long updated; /* jiffies */
119 unsigned long used;
120 struct list_head remotes;
121 u16 state; /* see ndm_state */
122 u8 flags; /* see ndm_flags */
123 u8 eth_addr[ETH_ALEN];
124 };
125
126 /* Pseudo network device */
127 struct vxlan_dev {
128 struct hlist_node hlist; /* vni hash table */
129 struct list_head next; /* vxlan's per namespace list */
130 struct vxlan_sock *vn_sock; /* listening socket */
131 struct net_device *dev;
132 struct net *net; /* netns for packet i/o */
133 struct vxlan_rdst default_dst; /* default destination */
134 union vxlan_addr saddr; /* source address */
135 __be16 dst_port;
136 __u16 port_min; /* source port range */
137 __u16 port_max;
138 __u8 tos; /* TOS override */
139 __u8 ttl;
140 u32 flags; /* VXLAN_F_* in vxlan.h */
141
142 struct work_struct sock_work;
143 struct work_struct igmp_join;
144 struct work_struct igmp_leave;
145
146 unsigned long age_interval;
147 struct timer_list age_timer;
148 spinlock_t hash_lock;
149 unsigned int addrcnt;
150 unsigned int addrmax;
151
152 struct hlist_head fdb_head[FDB_HASH_SIZE];
153 };
154
155 /* salt for hash table */
156 static u32 vxlan_salt __read_mostly;
157 static struct workqueue_struct *vxlan_wq;
158
159 static void vxlan_sock_work(struct work_struct *work);
160
161 #if IS_ENABLED(CONFIG_IPV6)
162 static inline
163 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
164 {
165 if (a->sa.sa_family != b->sa.sa_family)
166 return false;
167 if (a->sa.sa_family == AF_INET6)
168 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
169 else
170 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
171 }
172
173 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
174 {
175 if (ipa->sa.sa_family == AF_INET6)
176 return ipv6_addr_any(&ipa->sin6.sin6_addr);
177 else
178 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
179 }
180
181 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
182 {
183 if (ipa->sa.sa_family == AF_INET6)
184 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
185 else
186 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
187 }
188
189 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
190 {
191 if (nla_len(nla) >= sizeof(struct in6_addr)) {
192 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
193 ip->sa.sa_family = AF_INET6;
194 return 0;
195 } else if (nla_len(nla) >= sizeof(__be32)) {
196 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
197 ip->sa.sa_family = AF_INET;
198 return 0;
199 } else {
200 return -EAFNOSUPPORT;
201 }
202 }
203
204 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
205 const union vxlan_addr *ip)
206 {
207 if (ip->sa.sa_family == AF_INET6)
208 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
209 else
210 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
211 }
212
213 #else /* !CONFIG_IPV6 */
214
215 static inline
216 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
217 {
218 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
219 }
220
221 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
222 {
223 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
224 }
225
226 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
227 {
228 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
229 }
230
231 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
232 {
233 if (nla_len(nla) >= sizeof(struct in6_addr)) {
234 return -EAFNOSUPPORT;
235 } else if (nla_len(nla) >= sizeof(__be32)) {
236 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
237 ip->sa.sa_family = AF_INET;
238 return 0;
239 } else {
240 return -EAFNOSUPPORT;
241 }
242 }
243
244 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
245 const union vxlan_addr *ip)
246 {
247 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
248 }
249 #endif
250
251 /* Virtual Network hash table head */
252 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
253 {
254 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
255 }
256
257 /* Socket hash table head */
258 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
259 {
260 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
261
262 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
263 }
264
265 /* First remote destination for a forwarding entry.
266 * Guaranteed to be non-NULL because remotes are never deleted.
267 */
268 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
269 {
270 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
271 }
272
273 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
274 {
275 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
276 }
277
278 /* Find VXLAN socket based on network namespace and UDP port */
279 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
280 {
281 struct vxlan_sock *vs;
282
283 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
284 if (inet_sk(vs->sock->sk)->inet_sport == port)
285 return vs;
286 }
287 return NULL;
288 }
289
290 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
291 {
292 struct vxlan_dev *vxlan;
293
294 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
295 if (vxlan->default_dst.remote_vni == id)
296 return vxlan;
297 }
298
299 return NULL;
300 }
301
302 /* Look up VNI in a per net namespace table */
303 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
304 {
305 struct vxlan_sock *vs;
306
307 vs = vxlan_find_sock(net, port);
308 if (!vs)
309 return NULL;
310
311 return vxlan_vs_find_vni(vs, id);
312 }
313
314 /* Fill in neighbour message in skbuff. */
315 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
316 const struct vxlan_fdb *fdb,
317 u32 portid, u32 seq, int type, unsigned int flags,
318 const struct vxlan_rdst *rdst)
319 {
320 unsigned long now = jiffies;
321 struct nda_cacheinfo ci;
322 struct nlmsghdr *nlh;
323 struct ndmsg *ndm;
324 bool send_ip, send_eth;
325
326 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
327 if (nlh == NULL)
328 return -EMSGSIZE;
329
330 ndm = nlmsg_data(nlh);
331 memset(ndm, 0, sizeof(*ndm));
332
333 send_eth = send_ip = true;
334
335 if (type == RTM_GETNEIGH) {
336 ndm->ndm_family = AF_INET;
337 send_ip = !vxlan_addr_any(&rdst->remote_ip);
338 send_eth = !is_zero_ether_addr(fdb->eth_addr);
339 } else
340 ndm->ndm_family = AF_BRIDGE;
341 ndm->ndm_state = fdb->state;
342 ndm->ndm_ifindex = vxlan->dev->ifindex;
343 ndm->ndm_flags = fdb->flags;
344 ndm->ndm_type = RTN_UNICAST;
345
346 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
347 goto nla_put_failure;
348
349 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
350 goto nla_put_failure;
351
352 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
353 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
354 goto nla_put_failure;
355 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
356 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
357 goto nla_put_failure;
358 if (rdst->remote_ifindex &&
359 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
360 goto nla_put_failure;
361
362 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
363 ci.ndm_confirmed = 0;
364 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
365 ci.ndm_refcnt = 0;
366
367 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
368 goto nla_put_failure;
369
370 return nlmsg_end(skb, nlh);
371
372 nla_put_failure:
373 nlmsg_cancel(skb, nlh);
374 return -EMSGSIZE;
375 }
376
377 static inline size_t vxlan_nlmsg_size(void)
378 {
379 return NLMSG_ALIGN(sizeof(struct ndmsg))
380 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
381 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
382 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
383 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
384 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
385 + nla_total_size(sizeof(struct nda_cacheinfo));
386 }
387
388 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
389 struct vxlan_rdst *rd, int type)
390 {
391 struct net *net = dev_net(vxlan->dev);
392 struct sk_buff *skb;
393 int err = -ENOBUFS;
394
395 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
396 if (skb == NULL)
397 goto errout;
398
399 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
400 if (err < 0) {
401 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
402 WARN_ON(err == -EMSGSIZE);
403 kfree_skb(skb);
404 goto errout;
405 }
406
407 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
408 return;
409 errout:
410 if (err < 0)
411 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
412 }
413
414 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
415 {
416 struct vxlan_dev *vxlan = netdev_priv(dev);
417 struct vxlan_fdb f = {
418 .state = NUD_STALE,
419 };
420 struct vxlan_rdst remote = {
421 .remote_ip = *ipa, /* goes to NDA_DST */
422 .remote_vni = VXLAN_N_VID,
423 };
424
425 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
426 }
427
428 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
429 {
430 struct vxlan_fdb f = {
431 .state = NUD_STALE,
432 };
433 struct vxlan_rdst remote = { };
434
435 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
436
437 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
438 }
439
440 /* Hash Ethernet address */
441 static u32 eth_hash(const unsigned char *addr)
442 {
443 u64 value = get_unaligned((u64 *)addr);
444
445 /* only want 6 bytes */
446 #ifdef __BIG_ENDIAN
447 value >>= 16;
448 #else
449 value <<= 16;
450 #endif
451 return hash_64(value, FDB_HASH_BITS);
452 }
453
454 /* Hash chain to use given mac address */
455 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
456 const u8 *mac)
457 {
458 return &vxlan->fdb_head[eth_hash(mac)];
459 }
460
461 /* Look up Ethernet address in forwarding table */
462 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
463 const u8 *mac)
464 {
465 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
466 struct vxlan_fdb *f;
467
468 hlist_for_each_entry_rcu(f, head, hlist) {
469 if (ether_addr_equal(mac, f->eth_addr))
470 return f;
471 }
472
473 return NULL;
474 }
475
476 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
477 const u8 *mac)
478 {
479 struct vxlan_fdb *f;
480
481 f = __vxlan_find_mac(vxlan, mac);
482 if (f)
483 f->used = jiffies;
484
485 return f;
486 }
487
488 /* caller should hold vxlan->hash_lock */
489 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
490 union vxlan_addr *ip, __be16 port,
491 __u32 vni, __u32 ifindex)
492 {
493 struct vxlan_rdst *rd;
494
495 list_for_each_entry(rd, &f->remotes, list) {
496 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
497 rd->remote_port == port &&
498 rd->remote_vni == vni &&
499 rd->remote_ifindex == ifindex)
500 return rd;
501 }
502
503 return NULL;
504 }
505
506 /* Replace destination of unicast mac */
507 static int vxlan_fdb_replace(struct vxlan_fdb *f,
508 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
509 {
510 struct vxlan_rdst *rd;
511
512 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
513 if (rd)
514 return 0;
515
516 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
517 if (!rd)
518 return 0;
519 rd->remote_ip = *ip;
520 rd->remote_port = port;
521 rd->remote_vni = vni;
522 rd->remote_ifindex = ifindex;
523 return 1;
524 }
525
526 /* Add/update destinations for multicast */
527 static int vxlan_fdb_append(struct vxlan_fdb *f,
528 union vxlan_addr *ip, __be16 port, __u32 vni,
529 __u32 ifindex, struct vxlan_rdst **rdp)
530 {
531 struct vxlan_rdst *rd;
532
533 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
534 if (rd)
535 return 0;
536
537 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
538 if (rd == NULL)
539 return -ENOBUFS;
540 rd->remote_ip = *ip;
541 rd->remote_port = port;
542 rd->remote_vni = vni;
543 rd->remote_ifindex = ifindex;
544
545 list_add_tail_rcu(&rd->list, &f->remotes);
546
547 *rdp = rd;
548 return 1;
549 }
550
551 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
552 {
553 struct sk_buff *p, **pp = NULL;
554 struct vxlanhdr *vh, *vh2;
555 struct ethhdr *eh, *eh2;
556 unsigned int hlen, off_vx, off_eth;
557 const struct packet_offload *ptype;
558 __be16 type;
559 int flush = 1;
560
561 off_vx = skb_gro_offset(skb);
562 hlen = off_vx + sizeof(*vh);
563 vh = skb_gro_header_fast(skb, off_vx);
564 if (skb_gro_header_hard(skb, hlen)) {
565 vh = skb_gro_header_slow(skb, hlen, off_vx);
566 if (unlikely(!vh))
567 goto out;
568 }
569 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
570 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
571
572 off_eth = skb_gro_offset(skb);
573 hlen = off_eth + sizeof(*eh);
574 eh = skb_gro_header_fast(skb, off_eth);
575 if (skb_gro_header_hard(skb, hlen)) {
576 eh = skb_gro_header_slow(skb, hlen, off_eth);
577 if (unlikely(!eh))
578 goto out;
579 }
580
581 flush = 0;
582
583 for (p = *head; p; p = p->next) {
584 if (!NAPI_GRO_CB(p)->same_flow)
585 continue;
586
587 vh2 = (struct vxlanhdr *)(p->data + off_vx);
588 eh2 = (struct ethhdr *)(p->data + off_eth);
589 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
590 NAPI_GRO_CB(p)->same_flow = 0;
591 continue;
592 }
593 }
594
595 type = eh->h_proto;
596
597 rcu_read_lock();
598 ptype = gro_find_receive_by_type(type);
599 if (ptype == NULL) {
600 flush = 1;
601 goto out_unlock;
602 }
603
604 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
605 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
606 pp = ptype->callbacks.gro_receive(head, skb);
607
608 out_unlock:
609 rcu_read_unlock();
610 out:
611 NAPI_GRO_CB(skb)->flush |= flush;
612
613 return pp;
614 }
615
616 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
617 {
618 struct ethhdr *eh;
619 struct packet_offload *ptype;
620 __be16 type;
621 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
622 int err = -ENOSYS;
623
624 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
625 type = eh->h_proto;
626
627 rcu_read_lock();
628 ptype = gro_find_complete_by_type(type);
629 if (ptype != NULL)
630 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
631
632 rcu_read_unlock();
633 return err;
634 }
635
636 /* Notify netdevs that UDP port started listening */
637 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
638 {
639 struct net_device *dev;
640 struct sock *sk = vs->sock->sk;
641 struct net *net = sock_net(sk);
642 sa_family_t sa_family = sk->sk_family;
643 __be16 port = inet_sk(sk)->inet_sport;
644 int err;
645
646 if (sa_family == AF_INET) {
647 err = udp_add_offload(&vs->udp_offloads);
648 if (err)
649 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
650 }
651
652 rcu_read_lock();
653 for_each_netdev_rcu(net, dev) {
654 if (dev->netdev_ops->ndo_add_vxlan_port)
655 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
656 port);
657 }
658 rcu_read_unlock();
659 }
660
661 /* Notify netdevs that UDP port is no more listening */
662 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
663 {
664 struct net_device *dev;
665 struct sock *sk = vs->sock->sk;
666 struct net *net = sock_net(sk);
667 sa_family_t sa_family = sk->sk_family;
668 __be16 port = inet_sk(sk)->inet_sport;
669
670 rcu_read_lock();
671 for_each_netdev_rcu(net, dev) {
672 if (dev->netdev_ops->ndo_del_vxlan_port)
673 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
674 port);
675 }
676 rcu_read_unlock();
677
678 if (sa_family == AF_INET)
679 udp_del_offload(&vs->udp_offloads);
680 }
681
682 /* Add new entry to forwarding table -- assumes lock held */
683 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
684 const u8 *mac, union vxlan_addr *ip,
685 __u16 state, __u16 flags,
686 __be16 port, __u32 vni, __u32 ifindex,
687 __u8 ndm_flags)
688 {
689 struct vxlan_rdst *rd = NULL;
690 struct vxlan_fdb *f;
691 int notify = 0;
692
693 f = __vxlan_find_mac(vxlan, mac);
694 if (f) {
695 if (flags & NLM_F_EXCL) {
696 netdev_dbg(vxlan->dev,
697 "lost race to create %pM\n", mac);
698 return -EEXIST;
699 }
700 if (f->state != state) {
701 f->state = state;
702 f->updated = jiffies;
703 notify = 1;
704 }
705 if (f->flags != ndm_flags) {
706 f->flags = ndm_flags;
707 f->updated = jiffies;
708 notify = 1;
709 }
710 if ((flags & NLM_F_REPLACE)) {
711 /* Only change unicasts */
712 if (!(is_multicast_ether_addr(f->eth_addr) ||
713 is_zero_ether_addr(f->eth_addr))) {
714 int rc = vxlan_fdb_replace(f, ip, port, vni,
715 ifindex);
716
717 if (rc < 0)
718 return rc;
719 notify |= rc;
720 } else
721 return -EOPNOTSUPP;
722 }
723 if ((flags & NLM_F_APPEND) &&
724 (is_multicast_ether_addr(f->eth_addr) ||
725 is_zero_ether_addr(f->eth_addr))) {
726 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
727 &rd);
728
729 if (rc < 0)
730 return rc;
731 notify |= rc;
732 }
733 } else {
734 if (!(flags & NLM_F_CREATE))
735 return -ENOENT;
736
737 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
738 return -ENOSPC;
739
740 /* Disallow replace to add a multicast entry */
741 if ((flags & NLM_F_REPLACE) &&
742 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
743 return -EOPNOTSUPP;
744
745 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
746 f = kmalloc(sizeof(*f), GFP_ATOMIC);
747 if (!f)
748 return -ENOMEM;
749
750 notify = 1;
751 f->state = state;
752 f->flags = ndm_flags;
753 f->updated = f->used = jiffies;
754 INIT_LIST_HEAD(&f->remotes);
755 memcpy(f->eth_addr, mac, ETH_ALEN);
756
757 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
758
759 ++vxlan->addrcnt;
760 hlist_add_head_rcu(&f->hlist,
761 vxlan_fdb_head(vxlan, mac));
762 }
763
764 if (notify) {
765 if (rd == NULL)
766 rd = first_remote_rtnl(f);
767 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
768 }
769
770 return 0;
771 }
772
773 static void vxlan_fdb_free(struct rcu_head *head)
774 {
775 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
776 struct vxlan_rdst *rd, *nd;
777
778 list_for_each_entry_safe(rd, nd, &f->remotes, list)
779 kfree(rd);
780 kfree(f);
781 }
782
783 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
784 {
785 netdev_dbg(vxlan->dev,
786 "delete %pM\n", f->eth_addr);
787
788 --vxlan->addrcnt;
789 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
790
791 hlist_del_rcu(&f->hlist);
792 call_rcu(&f->rcu, vxlan_fdb_free);
793 }
794
795 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
796 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
797 {
798 struct net *net = dev_net(vxlan->dev);
799 int err;
800
801 if (tb[NDA_DST]) {
802 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
803 if (err)
804 return err;
805 } else {
806 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
807 if (remote->sa.sa_family == AF_INET) {
808 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
809 ip->sa.sa_family = AF_INET;
810 #if IS_ENABLED(CONFIG_IPV6)
811 } else {
812 ip->sin6.sin6_addr = in6addr_any;
813 ip->sa.sa_family = AF_INET6;
814 #endif
815 }
816 }
817
818 if (tb[NDA_PORT]) {
819 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
820 return -EINVAL;
821 *port = nla_get_be16(tb[NDA_PORT]);
822 } else {
823 *port = vxlan->dst_port;
824 }
825
826 if (tb[NDA_VNI]) {
827 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
828 return -EINVAL;
829 *vni = nla_get_u32(tb[NDA_VNI]);
830 } else {
831 *vni = vxlan->default_dst.remote_vni;
832 }
833
834 if (tb[NDA_IFINDEX]) {
835 struct net_device *tdev;
836
837 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
838 return -EINVAL;
839 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
840 tdev = __dev_get_by_index(net, *ifindex);
841 if (!tdev)
842 return -EADDRNOTAVAIL;
843 } else {
844 *ifindex = 0;
845 }
846
847 return 0;
848 }
849
850 /* Add static entry (via netlink) */
851 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
852 struct net_device *dev,
853 const unsigned char *addr, u16 flags)
854 {
855 struct vxlan_dev *vxlan = netdev_priv(dev);
856 /* struct net *net = dev_net(vxlan->dev); */
857 union vxlan_addr ip;
858 __be16 port;
859 u32 vni, ifindex;
860 int err;
861
862 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
863 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
864 ndm->ndm_state);
865 return -EINVAL;
866 }
867
868 if (tb[NDA_DST] == NULL)
869 return -EINVAL;
870
871 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
872 if (err)
873 return err;
874
875 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
876 return -EAFNOSUPPORT;
877
878 spin_lock_bh(&vxlan->hash_lock);
879 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
880 port, vni, ifindex, ndm->ndm_flags);
881 spin_unlock_bh(&vxlan->hash_lock);
882
883 return err;
884 }
885
886 /* Delete entry (via netlink) */
887 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
888 struct net_device *dev,
889 const unsigned char *addr)
890 {
891 struct vxlan_dev *vxlan = netdev_priv(dev);
892 struct vxlan_fdb *f;
893 struct vxlan_rdst *rd = NULL;
894 union vxlan_addr ip;
895 __be16 port;
896 u32 vni, ifindex;
897 int err;
898
899 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
900 if (err)
901 return err;
902
903 err = -ENOENT;
904
905 spin_lock_bh(&vxlan->hash_lock);
906 f = vxlan_find_mac(vxlan, addr);
907 if (!f)
908 goto out;
909
910 if (!vxlan_addr_any(&ip)) {
911 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
912 if (!rd)
913 goto out;
914 }
915
916 err = 0;
917
918 /* remove a destination if it's not the only one on the list,
919 * otherwise destroy the fdb entry
920 */
921 if (rd && !list_is_singular(&f->remotes)) {
922 list_del_rcu(&rd->list);
923 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
924 kfree_rcu(rd, rcu);
925 goto out;
926 }
927
928 vxlan_fdb_destroy(vxlan, f);
929
930 out:
931 spin_unlock_bh(&vxlan->hash_lock);
932
933 return err;
934 }
935
936 /* Dump forwarding table */
937 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
938 struct net_device *dev,
939 struct net_device *filter_dev, int idx)
940 {
941 struct vxlan_dev *vxlan = netdev_priv(dev);
942 unsigned int h;
943
944 for (h = 0; h < FDB_HASH_SIZE; ++h) {
945 struct vxlan_fdb *f;
946 int err;
947
948 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
949 struct vxlan_rdst *rd;
950
951 if (idx < cb->args[0])
952 goto skip;
953
954 list_for_each_entry_rcu(rd, &f->remotes, list) {
955 err = vxlan_fdb_info(skb, vxlan, f,
956 NETLINK_CB(cb->skb).portid,
957 cb->nlh->nlmsg_seq,
958 RTM_NEWNEIGH,
959 NLM_F_MULTI, rd);
960 if (err < 0)
961 goto out;
962 }
963 skip:
964 ++idx;
965 }
966 }
967 out:
968 return idx;
969 }
970
971 /* Watch incoming packets to learn mapping between Ethernet address
972 * and Tunnel endpoint.
973 * Return true if packet is bogus and should be droppped.
974 */
975 static bool vxlan_snoop(struct net_device *dev,
976 union vxlan_addr *src_ip, const u8 *src_mac)
977 {
978 struct vxlan_dev *vxlan = netdev_priv(dev);
979 struct vxlan_fdb *f;
980
981 f = vxlan_find_mac(vxlan, src_mac);
982 if (likely(f)) {
983 struct vxlan_rdst *rdst = first_remote_rcu(f);
984
985 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
986 return false;
987
988 /* Don't migrate static entries, drop packets */
989 if (f->state & NUD_NOARP)
990 return true;
991
992 if (net_ratelimit())
993 netdev_info(dev,
994 "%pM migrated from %pIS to %pIS\n",
995 src_mac, &rdst->remote_ip, &src_ip);
996
997 rdst->remote_ip = *src_ip;
998 f->updated = jiffies;
999 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1000 } else {
1001 /* learned new entry */
1002 spin_lock(&vxlan->hash_lock);
1003
1004 /* close off race between vxlan_flush and incoming packets */
1005 if (netif_running(dev))
1006 vxlan_fdb_create(vxlan, src_mac, src_ip,
1007 NUD_REACHABLE,
1008 NLM_F_EXCL|NLM_F_CREATE,
1009 vxlan->dst_port,
1010 vxlan->default_dst.remote_vni,
1011 0, NTF_SELF);
1012 spin_unlock(&vxlan->hash_lock);
1013 }
1014
1015 return false;
1016 }
1017
1018 /* See if multicast group is already in use by other ID */
1019 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1020 {
1021 struct vxlan_dev *vxlan;
1022
1023 /* The vxlan_sock is only used by dev, leaving group has
1024 * no effect on other vxlan devices.
1025 */
1026 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1027 return false;
1028
1029 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1030 if (!netif_running(vxlan->dev) || vxlan == dev)
1031 continue;
1032
1033 if (vxlan->vn_sock != dev->vn_sock)
1034 continue;
1035
1036 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1037 &dev->default_dst.remote_ip))
1038 continue;
1039
1040 if (vxlan->default_dst.remote_ifindex !=
1041 dev->default_dst.remote_ifindex)
1042 continue;
1043
1044 return true;
1045 }
1046
1047 return false;
1048 }
1049
1050 static void vxlan_sock_hold(struct vxlan_sock *vs)
1051 {
1052 atomic_inc(&vs->refcnt);
1053 }
1054
1055 void vxlan_sock_release(struct vxlan_sock *vs)
1056 {
1057 struct sock *sk = vs->sock->sk;
1058 struct net *net = sock_net(sk);
1059 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1060
1061 if (!atomic_dec_and_test(&vs->refcnt))
1062 return;
1063
1064 spin_lock(&vn->sock_lock);
1065 hlist_del_rcu(&vs->hlist);
1066 vxlan_notify_del_rx_port(vs);
1067 spin_unlock(&vn->sock_lock);
1068
1069 queue_work(vxlan_wq, &vs->del_work);
1070 }
1071 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1072
1073 /* Callback to update multicast group membership when first VNI on
1074 * multicast asddress is brought up
1075 * Done as workqueue because ip_mc_join_group acquires RTNL.
1076 */
1077 static void vxlan_igmp_join(struct work_struct *work)
1078 {
1079 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1080 struct vxlan_sock *vs = vxlan->vn_sock;
1081 struct sock *sk = vs->sock->sk;
1082 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1083 int ifindex = vxlan->default_dst.remote_ifindex;
1084
1085 lock_sock(sk);
1086 if (ip->sa.sa_family == AF_INET) {
1087 struct ip_mreqn mreq = {
1088 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1089 .imr_ifindex = ifindex,
1090 };
1091
1092 ip_mc_join_group(sk, &mreq);
1093 #if IS_ENABLED(CONFIG_IPV6)
1094 } else {
1095 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1096 &ip->sin6.sin6_addr);
1097 #endif
1098 }
1099 release_sock(sk);
1100
1101 vxlan_sock_release(vs);
1102 dev_put(vxlan->dev);
1103 }
1104
1105 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1106 static void vxlan_igmp_leave(struct work_struct *work)
1107 {
1108 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1109 struct vxlan_sock *vs = vxlan->vn_sock;
1110 struct sock *sk = vs->sock->sk;
1111 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1112 int ifindex = vxlan->default_dst.remote_ifindex;
1113
1114 lock_sock(sk);
1115 if (ip->sa.sa_family == AF_INET) {
1116 struct ip_mreqn mreq = {
1117 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1118 .imr_ifindex = ifindex,
1119 };
1120
1121 ip_mc_leave_group(sk, &mreq);
1122 #if IS_ENABLED(CONFIG_IPV6)
1123 } else {
1124 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1125 &ip->sin6.sin6_addr);
1126 #endif
1127 }
1128
1129 release_sock(sk);
1130
1131 vxlan_sock_release(vs);
1132 dev_put(vxlan->dev);
1133 }
1134
1135 /* Callback from net/ipv4/udp.c to receive packets */
1136 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1137 {
1138 struct vxlan_sock *vs;
1139 struct vxlanhdr *vxh;
1140
1141 /* Need Vxlan and inner Ethernet header to be present */
1142 if (!pskb_may_pull(skb, VXLAN_HLEN))
1143 goto error;
1144
1145 /* Return packets with reserved bits set */
1146 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1147 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1148 (vxh->vx_vni & htonl(0xff))) {
1149 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1150 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1151 goto error;
1152 }
1153
1154 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1155 goto drop;
1156
1157 vs = rcu_dereference_sk_user_data(sk);
1158 if (!vs)
1159 goto drop;
1160
1161 vs->rcv(vs, skb, vxh->vx_vni);
1162 return 0;
1163
1164 drop:
1165 /* Consume bad packet */
1166 kfree_skb(skb);
1167 return 0;
1168
1169 error:
1170 /* Return non vxlan pkt */
1171 return 1;
1172 }
1173
1174 static void vxlan_rcv(struct vxlan_sock *vs,
1175 struct sk_buff *skb, __be32 vx_vni)
1176 {
1177 struct iphdr *oip = NULL;
1178 struct ipv6hdr *oip6 = NULL;
1179 struct vxlan_dev *vxlan;
1180 struct pcpu_sw_netstats *stats;
1181 union vxlan_addr saddr;
1182 __u32 vni;
1183 int err = 0;
1184 union vxlan_addr *remote_ip;
1185
1186 vni = ntohl(vx_vni) >> 8;
1187 /* Is this VNI defined? */
1188 vxlan = vxlan_vs_find_vni(vs, vni);
1189 if (!vxlan)
1190 goto drop;
1191
1192 remote_ip = &vxlan->default_dst.remote_ip;
1193 skb_reset_mac_header(skb);
1194 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1195 skb->protocol = eth_type_trans(skb, vxlan->dev);
1196 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1197
1198 /* Ignore packet loops (and multicast echo) */
1199 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1200 goto drop;
1201
1202 /* Re-examine inner Ethernet packet */
1203 if (remote_ip->sa.sa_family == AF_INET) {
1204 oip = ip_hdr(skb);
1205 saddr.sin.sin_addr.s_addr = oip->saddr;
1206 saddr.sa.sa_family = AF_INET;
1207 #if IS_ENABLED(CONFIG_IPV6)
1208 } else {
1209 oip6 = ipv6_hdr(skb);
1210 saddr.sin6.sin6_addr = oip6->saddr;
1211 saddr.sa.sa_family = AF_INET6;
1212 #endif
1213 }
1214
1215 if ((vxlan->flags & VXLAN_F_LEARN) &&
1216 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1217 goto drop;
1218
1219 skb_reset_network_header(skb);
1220
1221 if (oip6)
1222 err = IP6_ECN_decapsulate(oip6, skb);
1223 if (oip)
1224 err = IP_ECN_decapsulate(oip, skb);
1225
1226 if (unlikely(err)) {
1227 if (log_ecn_error) {
1228 if (oip6)
1229 net_info_ratelimited("non-ECT from %pI6\n",
1230 &oip6->saddr);
1231 if (oip)
1232 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1233 &oip->saddr, oip->tos);
1234 }
1235 if (err > 1) {
1236 ++vxlan->dev->stats.rx_frame_errors;
1237 ++vxlan->dev->stats.rx_errors;
1238 goto drop;
1239 }
1240 }
1241
1242 stats = this_cpu_ptr(vxlan->dev->tstats);
1243 u64_stats_update_begin(&stats->syncp);
1244 stats->rx_packets++;
1245 stats->rx_bytes += skb->len;
1246 u64_stats_update_end(&stats->syncp);
1247
1248 netif_rx(skb);
1249
1250 return;
1251 drop:
1252 /* Consume bad packet */
1253 kfree_skb(skb);
1254 }
1255
1256 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1257 {
1258 struct vxlan_dev *vxlan = netdev_priv(dev);
1259 struct arphdr *parp;
1260 u8 *arpptr, *sha;
1261 __be32 sip, tip;
1262 struct neighbour *n;
1263
1264 if (dev->flags & IFF_NOARP)
1265 goto out;
1266
1267 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1268 dev->stats.tx_dropped++;
1269 goto out;
1270 }
1271 parp = arp_hdr(skb);
1272
1273 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1274 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1275 parp->ar_pro != htons(ETH_P_IP) ||
1276 parp->ar_op != htons(ARPOP_REQUEST) ||
1277 parp->ar_hln != dev->addr_len ||
1278 parp->ar_pln != 4)
1279 goto out;
1280 arpptr = (u8 *)parp + sizeof(struct arphdr);
1281 sha = arpptr;
1282 arpptr += dev->addr_len; /* sha */
1283 memcpy(&sip, arpptr, sizeof(sip));
1284 arpptr += sizeof(sip);
1285 arpptr += dev->addr_len; /* tha */
1286 memcpy(&tip, arpptr, sizeof(tip));
1287
1288 if (ipv4_is_loopback(tip) ||
1289 ipv4_is_multicast(tip))
1290 goto out;
1291
1292 n = neigh_lookup(&arp_tbl, &tip, dev);
1293
1294 if (n) {
1295 struct vxlan_fdb *f;
1296 struct sk_buff *reply;
1297
1298 if (!(n->nud_state & NUD_CONNECTED)) {
1299 neigh_release(n);
1300 goto out;
1301 }
1302
1303 f = vxlan_find_mac(vxlan, n->ha);
1304 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1305 /* bridge-local neighbor */
1306 neigh_release(n);
1307 goto out;
1308 }
1309
1310 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1311 n->ha, sha);
1312
1313 neigh_release(n);
1314
1315 if (reply == NULL)
1316 goto out;
1317
1318 skb_reset_mac_header(reply);
1319 __skb_pull(reply, skb_network_offset(reply));
1320 reply->ip_summed = CHECKSUM_UNNECESSARY;
1321 reply->pkt_type = PACKET_HOST;
1322
1323 if (netif_rx_ni(reply) == NET_RX_DROP)
1324 dev->stats.rx_dropped++;
1325 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1326 union vxlan_addr ipa = {
1327 .sin.sin_addr.s_addr = tip,
1328 .sin.sin_family = AF_INET,
1329 };
1330
1331 vxlan_ip_miss(dev, &ipa);
1332 }
1333 out:
1334 consume_skb(skb);
1335 return NETDEV_TX_OK;
1336 }
1337
1338 #if IS_ENABLED(CONFIG_IPV6)
1339 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1340 struct neighbour *n, bool isrouter)
1341 {
1342 struct net_device *dev = request->dev;
1343 struct sk_buff *reply;
1344 struct nd_msg *ns, *na;
1345 struct ipv6hdr *pip6;
1346 u8 *daddr;
1347 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1348 int ns_olen;
1349 int i, len;
1350
1351 if (dev == NULL)
1352 return NULL;
1353
1354 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1355 sizeof(*na) + na_olen + dev->needed_tailroom;
1356 reply = alloc_skb(len, GFP_ATOMIC);
1357 if (reply == NULL)
1358 return NULL;
1359
1360 reply->protocol = htons(ETH_P_IPV6);
1361 reply->dev = dev;
1362 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1363 skb_push(reply, sizeof(struct ethhdr));
1364 skb_set_mac_header(reply, 0);
1365
1366 ns = (struct nd_msg *)skb_transport_header(request);
1367
1368 daddr = eth_hdr(request)->h_source;
1369 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1370 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1371 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1372 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1373 break;
1374 }
1375 }
1376
1377 /* Ethernet header */
1378 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1379 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1380 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1381 reply->protocol = htons(ETH_P_IPV6);
1382
1383 skb_pull(reply, sizeof(struct ethhdr));
1384 skb_set_network_header(reply, 0);
1385 skb_put(reply, sizeof(struct ipv6hdr));
1386
1387 /* IPv6 header */
1388
1389 pip6 = ipv6_hdr(reply);
1390 memset(pip6, 0, sizeof(struct ipv6hdr));
1391 pip6->version = 6;
1392 pip6->priority = ipv6_hdr(request)->priority;
1393 pip6->nexthdr = IPPROTO_ICMPV6;
1394 pip6->hop_limit = 255;
1395 pip6->daddr = ipv6_hdr(request)->saddr;
1396 pip6->saddr = *(struct in6_addr *)n->primary_key;
1397
1398 skb_pull(reply, sizeof(struct ipv6hdr));
1399 skb_set_transport_header(reply, 0);
1400
1401 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1402
1403 /* Neighbor Advertisement */
1404 memset(na, 0, sizeof(*na)+na_olen);
1405 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1406 na->icmph.icmp6_router = isrouter;
1407 na->icmph.icmp6_override = 1;
1408 na->icmph.icmp6_solicited = 1;
1409 na->target = ns->target;
1410 ether_addr_copy(&na->opt[2], n->ha);
1411 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1412 na->opt[1] = na_olen >> 3;
1413
1414 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1415 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1416 csum_partial(na, sizeof(*na)+na_olen, 0));
1417
1418 pip6->payload_len = htons(sizeof(*na)+na_olen);
1419
1420 skb_push(reply, sizeof(struct ipv6hdr));
1421
1422 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423
1424 return reply;
1425 }
1426
1427 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1428 {
1429 struct vxlan_dev *vxlan = netdev_priv(dev);
1430 struct nd_msg *msg;
1431 const struct ipv6hdr *iphdr;
1432 const struct in6_addr *saddr, *daddr;
1433 struct neighbour *n;
1434 struct inet6_dev *in6_dev;
1435
1436 in6_dev = __in6_dev_get(dev);
1437 if (!in6_dev)
1438 goto out;
1439
1440 iphdr = ipv6_hdr(skb);
1441 saddr = &iphdr->saddr;
1442 daddr = &iphdr->daddr;
1443
1444 msg = (struct nd_msg *)skb_transport_header(skb);
1445 if (msg->icmph.icmp6_code != 0 ||
1446 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1447 goto out;
1448
1449 if (ipv6_addr_loopback(daddr) ||
1450 ipv6_addr_is_multicast(&msg->target))
1451 goto out;
1452
1453 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1454
1455 if (n) {
1456 struct vxlan_fdb *f;
1457 struct sk_buff *reply;
1458
1459 if (!(n->nud_state & NUD_CONNECTED)) {
1460 neigh_release(n);
1461 goto out;
1462 }
1463
1464 f = vxlan_find_mac(vxlan, n->ha);
1465 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1466 /* bridge-local neighbor */
1467 neigh_release(n);
1468 goto out;
1469 }
1470
1471 reply = vxlan_na_create(skb, n,
1472 !!(f ? f->flags & NTF_ROUTER : 0));
1473
1474 neigh_release(n);
1475
1476 if (reply == NULL)
1477 goto out;
1478
1479 if (netif_rx_ni(reply) == NET_RX_DROP)
1480 dev->stats.rx_dropped++;
1481
1482 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1483 union vxlan_addr ipa = {
1484 .sin6.sin6_addr = msg->target,
1485 .sin6.sin6_family = AF_INET6,
1486 };
1487
1488 vxlan_ip_miss(dev, &ipa);
1489 }
1490
1491 out:
1492 consume_skb(skb);
1493 return NETDEV_TX_OK;
1494 }
1495 #endif
1496
1497 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1498 {
1499 struct vxlan_dev *vxlan = netdev_priv(dev);
1500 struct neighbour *n;
1501
1502 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1503 return false;
1504
1505 n = NULL;
1506 switch (ntohs(eth_hdr(skb)->h_proto)) {
1507 case ETH_P_IP:
1508 {
1509 struct iphdr *pip;
1510
1511 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1512 return false;
1513 pip = ip_hdr(skb);
1514 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1515 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1516 union vxlan_addr ipa = {
1517 .sin.sin_addr.s_addr = pip->daddr,
1518 .sin.sin_family = AF_INET,
1519 };
1520
1521 vxlan_ip_miss(dev, &ipa);
1522 return false;
1523 }
1524
1525 break;
1526 }
1527 #if IS_ENABLED(CONFIG_IPV6)
1528 case ETH_P_IPV6:
1529 {
1530 struct ipv6hdr *pip6;
1531
1532 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1533 return false;
1534 pip6 = ipv6_hdr(skb);
1535 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1536 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1537 union vxlan_addr ipa = {
1538 .sin6.sin6_addr = pip6->daddr,
1539 .sin6.sin6_family = AF_INET6,
1540 };
1541
1542 vxlan_ip_miss(dev, &ipa);
1543 return false;
1544 }
1545
1546 break;
1547 }
1548 #endif
1549 default:
1550 return false;
1551 }
1552
1553 if (n) {
1554 bool diff;
1555
1556 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1557 if (diff) {
1558 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1559 dev->addr_len);
1560 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1561 }
1562 neigh_release(n);
1563 return diff;
1564 }
1565
1566 return false;
1567 }
1568
1569 #if IS_ENABLED(CONFIG_IPV6)
1570 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1571 struct dst_entry *dst, struct sk_buff *skb,
1572 struct net_device *dev, struct in6_addr *saddr,
1573 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1574 __be16 src_port, __be16 dst_port, __be32 vni,
1575 bool xnet)
1576 {
1577 struct vxlanhdr *vxh;
1578 int min_headroom;
1579 int err;
1580 bool udp_sum = !udp_get_no_check6_tx(vs->sock->sk);
1581
1582 skb = udp_tunnel_handle_offloads(skb, udp_sum);
1583 if (IS_ERR(skb))
1584 return -EINVAL;
1585
1586 skb_scrub_packet(skb, xnet);
1587
1588 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1589 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1590 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1591
1592 /* Need space for new headers (invalidates iph ptr) */
1593 err = skb_cow_head(skb, min_headroom);
1594 if (unlikely(err))
1595 return err;
1596
1597 if (vlan_tx_tag_present(skb)) {
1598 if (WARN_ON(!__vlan_put_tag(skb,
1599 skb->vlan_proto,
1600 vlan_tx_tag_get(skb))))
1601 return -ENOMEM;
1602
1603 skb->vlan_tci = 0;
1604 }
1605
1606 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1607 vxh->vx_flags = htonl(VXLAN_FLAGS);
1608 vxh->vx_vni = vni;
1609
1610 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1611
1612 udp_tunnel6_xmit_skb(vs->sock, dst, skb, dev, saddr, daddr, prio,
1613 ttl, src_port, dst_port);
1614 return 0;
1615 }
1616 #endif
1617
1618 int vxlan_xmit_skb(struct vxlan_sock *vs,
1619 struct rtable *rt, struct sk_buff *skb,
1620 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1621 __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
1622 {
1623 struct vxlanhdr *vxh;
1624 int min_headroom;
1625 int err;
1626 bool udp_sum = !vs->sock->sk->sk_no_check_tx;
1627
1628 skb = udp_tunnel_handle_offloads(skb, udp_sum);
1629 if (IS_ERR(skb))
1630 return -EINVAL;
1631
1632 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1633 + VXLAN_HLEN + sizeof(struct iphdr)
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_set_inner_protocol(skb, htons(ETH_P_TEB));
1655
1656 return udp_tunnel_xmit_skb(vs->sock, rt, skb, src, dst, tos,
1657 ttl, df, src_port, dst_port, xnet);
1658 }
1659 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1660
1661 /* Bypass encapsulation if the destination is local */
1662 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1663 struct vxlan_dev *dst_vxlan)
1664 {
1665 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1666 union vxlan_addr loopback;
1667 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1668 struct net_device *dev = skb->dev;
1669 int len = skb->len;
1670
1671 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1672 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1673 skb->pkt_type = PACKET_HOST;
1674 skb->encapsulation = 0;
1675 skb->dev = dst_vxlan->dev;
1676 __skb_pull(skb, skb_network_offset(skb));
1677
1678 if (remote_ip->sa.sa_family == AF_INET) {
1679 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1680 loopback.sa.sa_family = AF_INET;
1681 #if IS_ENABLED(CONFIG_IPV6)
1682 } else {
1683 loopback.sin6.sin6_addr = in6addr_loopback;
1684 loopback.sa.sa_family = AF_INET6;
1685 #endif
1686 }
1687
1688 if (dst_vxlan->flags & VXLAN_F_LEARN)
1689 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1690
1691 u64_stats_update_begin(&tx_stats->syncp);
1692 tx_stats->tx_packets++;
1693 tx_stats->tx_bytes += len;
1694 u64_stats_update_end(&tx_stats->syncp);
1695
1696 if (netif_rx(skb) == NET_RX_SUCCESS) {
1697 u64_stats_update_begin(&rx_stats->syncp);
1698 rx_stats->rx_packets++;
1699 rx_stats->rx_bytes += len;
1700 u64_stats_update_end(&rx_stats->syncp);
1701 } else {
1702 dev->stats.rx_dropped++;
1703 }
1704 }
1705
1706 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1707 struct vxlan_rdst *rdst, bool did_rsc)
1708 {
1709 struct vxlan_dev *vxlan = netdev_priv(dev);
1710 struct rtable *rt = NULL;
1711 const struct iphdr *old_iph;
1712 struct flowi4 fl4;
1713 union vxlan_addr *dst;
1714 __be16 src_port = 0, dst_port;
1715 u32 vni;
1716 __be16 df = 0;
1717 __u8 tos, ttl;
1718 int err;
1719
1720 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1721 vni = rdst->remote_vni;
1722 dst = &rdst->remote_ip;
1723
1724 if (vxlan_addr_any(dst)) {
1725 if (did_rsc) {
1726 /* short-circuited back to local bridge */
1727 vxlan_encap_bypass(skb, vxlan, vxlan);
1728 return;
1729 }
1730 goto drop;
1731 }
1732
1733 old_iph = ip_hdr(skb);
1734
1735 ttl = vxlan->ttl;
1736 if (!ttl && vxlan_addr_multicast(dst))
1737 ttl = 1;
1738
1739 tos = vxlan->tos;
1740 if (tos == 1)
1741 tos = ip_tunnel_get_dsfield(old_iph, skb);
1742
1743 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1744 vxlan->port_max, true);
1745
1746 if (dst->sa.sa_family == AF_INET) {
1747 memset(&fl4, 0, sizeof(fl4));
1748 fl4.flowi4_oif = rdst->remote_ifindex;
1749 fl4.flowi4_tos = RT_TOS(tos);
1750 fl4.daddr = dst->sin.sin_addr.s_addr;
1751 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1752
1753 rt = ip_route_output_key(vxlan->net, &fl4);
1754 if (IS_ERR(rt)) {
1755 netdev_dbg(dev, "no route to %pI4\n",
1756 &dst->sin.sin_addr.s_addr);
1757 dev->stats.tx_carrier_errors++;
1758 goto tx_error;
1759 }
1760
1761 if (rt->dst.dev == dev) {
1762 netdev_dbg(dev, "circular route to %pI4\n",
1763 &dst->sin.sin_addr.s_addr);
1764 dev->stats.collisions++;
1765 goto rt_tx_error;
1766 }
1767
1768 /* Bypass encapsulation if the destination is local */
1769 if (rt->rt_flags & RTCF_LOCAL &&
1770 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1771 struct vxlan_dev *dst_vxlan;
1772
1773 ip_rt_put(rt);
1774 dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
1775 if (!dst_vxlan)
1776 goto tx_error;
1777 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1778 return;
1779 }
1780
1781 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1782 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1783
1784 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1785 fl4.saddr, dst->sin.sin_addr.s_addr,
1786 tos, ttl, df, src_port, dst_port,
1787 htonl(vni << 8),
1788 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1789
1790 if (err < 0)
1791 goto rt_tx_error;
1792 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1793 #if IS_ENABLED(CONFIG_IPV6)
1794 } else {
1795 struct sock *sk = vxlan->vn_sock->sock->sk;
1796 struct dst_entry *ndst;
1797 struct flowi6 fl6;
1798 u32 flags;
1799
1800 memset(&fl6, 0, sizeof(fl6));
1801 fl6.flowi6_oif = rdst->remote_ifindex;
1802 fl6.daddr = dst->sin6.sin6_addr;
1803 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1804 fl6.flowi6_proto = IPPROTO_UDP;
1805
1806 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1807 netdev_dbg(dev, "no route to %pI6\n",
1808 &dst->sin6.sin6_addr);
1809 dev->stats.tx_carrier_errors++;
1810 goto tx_error;
1811 }
1812
1813 if (ndst->dev == dev) {
1814 netdev_dbg(dev, "circular route to %pI6\n",
1815 &dst->sin6.sin6_addr);
1816 dst_release(ndst);
1817 dev->stats.collisions++;
1818 goto tx_error;
1819 }
1820
1821 /* Bypass encapsulation if the destination is local */
1822 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1823 if (flags & RTF_LOCAL &&
1824 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1825 struct vxlan_dev *dst_vxlan;
1826
1827 dst_release(ndst);
1828 dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
1829 if (!dst_vxlan)
1830 goto tx_error;
1831 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1832 return;
1833 }
1834
1835 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1836
1837 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1838 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1839 src_port, dst_port, htonl(vni << 8),
1840 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1841 #endif
1842 }
1843
1844 return;
1845
1846 drop:
1847 dev->stats.tx_dropped++;
1848 goto tx_free;
1849
1850 rt_tx_error:
1851 ip_rt_put(rt);
1852 tx_error:
1853 dev->stats.tx_errors++;
1854 tx_free:
1855 dev_kfree_skb(skb);
1856 }
1857
1858 /* Transmit local packets over Vxlan
1859 *
1860 * Outer IP header inherits ECN and DF from inner header.
1861 * Outer UDP destination is the VXLAN assigned port.
1862 * source port is based on hash of flow
1863 */
1864 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1865 {
1866 struct vxlan_dev *vxlan = netdev_priv(dev);
1867 struct ethhdr *eth;
1868 bool did_rsc = false;
1869 struct vxlan_rdst *rdst, *fdst = NULL;
1870 struct vxlan_fdb *f;
1871
1872 skb_reset_mac_header(skb);
1873 eth = eth_hdr(skb);
1874
1875 if ((vxlan->flags & VXLAN_F_PROXY)) {
1876 if (ntohs(eth->h_proto) == ETH_P_ARP)
1877 return arp_reduce(dev, skb);
1878 #if IS_ENABLED(CONFIG_IPV6)
1879 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1880 pskb_may_pull(skb, sizeof(struct ipv6hdr)
1881 + sizeof(struct nd_msg)) &&
1882 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1883 struct nd_msg *msg;
1884
1885 msg = (struct nd_msg *)skb_transport_header(skb);
1886 if (msg->icmph.icmp6_code == 0 &&
1887 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1888 return neigh_reduce(dev, skb);
1889 }
1890 eth = eth_hdr(skb);
1891 #endif
1892 }
1893
1894 f = vxlan_find_mac(vxlan, eth->h_dest);
1895 did_rsc = false;
1896
1897 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1898 (ntohs(eth->h_proto) == ETH_P_IP ||
1899 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1900 did_rsc = route_shortcircuit(dev, skb);
1901 if (did_rsc)
1902 f = vxlan_find_mac(vxlan, eth->h_dest);
1903 }
1904
1905 if (f == NULL) {
1906 f = vxlan_find_mac(vxlan, all_zeros_mac);
1907 if (f == NULL) {
1908 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1909 !is_multicast_ether_addr(eth->h_dest))
1910 vxlan_fdb_miss(vxlan, eth->h_dest);
1911
1912 dev->stats.tx_dropped++;
1913 kfree_skb(skb);
1914 return NETDEV_TX_OK;
1915 }
1916 }
1917
1918 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1919 struct sk_buff *skb1;
1920
1921 if (!fdst) {
1922 fdst = rdst;
1923 continue;
1924 }
1925 skb1 = skb_clone(skb, GFP_ATOMIC);
1926 if (skb1)
1927 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1928 }
1929
1930 if (fdst)
1931 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1932 else
1933 kfree_skb(skb);
1934 return NETDEV_TX_OK;
1935 }
1936
1937 /* Walk the forwarding table and purge stale entries */
1938 static void vxlan_cleanup(unsigned long arg)
1939 {
1940 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1941 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1942 unsigned int h;
1943
1944 if (!netif_running(vxlan->dev))
1945 return;
1946
1947 spin_lock_bh(&vxlan->hash_lock);
1948 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1949 struct hlist_node *p, *n;
1950 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1951 struct vxlan_fdb *f
1952 = container_of(p, struct vxlan_fdb, hlist);
1953 unsigned long timeout;
1954
1955 if (f->state & NUD_PERMANENT)
1956 continue;
1957
1958 timeout = f->used + vxlan->age_interval * HZ;
1959 if (time_before_eq(timeout, jiffies)) {
1960 netdev_dbg(vxlan->dev,
1961 "garbage collect %pM\n",
1962 f->eth_addr);
1963 f->state = NUD_STALE;
1964 vxlan_fdb_destroy(vxlan, f);
1965 } else if (time_before(timeout, next_timer))
1966 next_timer = timeout;
1967 }
1968 }
1969 spin_unlock_bh(&vxlan->hash_lock);
1970
1971 mod_timer(&vxlan->age_timer, next_timer);
1972 }
1973
1974 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1975 {
1976 __u32 vni = vxlan->default_dst.remote_vni;
1977
1978 vxlan->vn_sock = vs;
1979 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1980 }
1981
1982 /* Setup stats when device is created */
1983 static int vxlan_init(struct net_device *dev)
1984 {
1985 struct vxlan_dev *vxlan = netdev_priv(dev);
1986 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1987 struct vxlan_sock *vs;
1988
1989 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1990 if (!dev->tstats)
1991 return -ENOMEM;
1992
1993 spin_lock(&vn->sock_lock);
1994 vs = vxlan_find_sock(vxlan->net, vxlan->dst_port);
1995 if (vs) {
1996 /* If we have a socket with same port already, reuse it */
1997 atomic_inc(&vs->refcnt);
1998 vxlan_vs_add_dev(vs, vxlan);
1999 } else {
2000 /* otherwise make new socket outside of RTNL */
2001 dev_hold(dev);
2002 queue_work(vxlan_wq, &vxlan->sock_work);
2003 }
2004 spin_unlock(&vn->sock_lock);
2005
2006 return 0;
2007 }
2008
2009 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2010 {
2011 struct vxlan_fdb *f;
2012
2013 spin_lock_bh(&vxlan->hash_lock);
2014 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2015 if (f)
2016 vxlan_fdb_destroy(vxlan, f);
2017 spin_unlock_bh(&vxlan->hash_lock);
2018 }
2019
2020 static void vxlan_uninit(struct net_device *dev)
2021 {
2022 struct vxlan_dev *vxlan = netdev_priv(dev);
2023 struct vxlan_sock *vs = vxlan->vn_sock;
2024
2025 vxlan_fdb_delete_default(vxlan);
2026
2027 if (vs)
2028 vxlan_sock_release(vs);
2029 free_percpu(dev->tstats);
2030 }
2031
2032 /* Start ageing timer and join group when device is brought up */
2033 static int vxlan_open(struct net_device *dev)
2034 {
2035 struct vxlan_dev *vxlan = netdev_priv(dev);
2036 struct vxlan_sock *vs = vxlan->vn_sock;
2037
2038 /* socket hasn't been created */
2039 if (!vs)
2040 return -ENOTCONN;
2041
2042 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2043 vxlan_sock_hold(vs);
2044 dev_hold(dev);
2045 queue_work(vxlan_wq, &vxlan->igmp_join);
2046 }
2047
2048 if (vxlan->age_interval)
2049 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2050
2051 return 0;
2052 }
2053
2054 /* Purge the forwarding table */
2055 static void vxlan_flush(struct vxlan_dev *vxlan)
2056 {
2057 unsigned int h;
2058
2059 spin_lock_bh(&vxlan->hash_lock);
2060 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2061 struct hlist_node *p, *n;
2062 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2063 struct vxlan_fdb *f
2064 = container_of(p, struct vxlan_fdb, hlist);
2065 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2066 if (!is_zero_ether_addr(f->eth_addr))
2067 vxlan_fdb_destroy(vxlan, f);
2068 }
2069 }
2070 spin_unlock_bh(&vxlan->hash_lock);
2071 }
2072
2073 /* Cleanup timer and forwarding table on shutdown */
2074 static int vxlan_stop(struct net_device *dev)
2075 {
2076 struct vxlan_dev *vxlan = netdev_priv(dev);
2077 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2078 struct vxlan_sock *vs = vxlan->vn_sock;
2079
2080 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2081 !vxlan_group_used(vn, vxlan)) {
2082 vxlan_sock_hold(vs);
2083 dev_hold(dev);
2084 queue_work(vxlan_wq, &vxlan->igmp_leave);
2085 }
2086
2087 del_timer_sync(&vxlan->age_timer);
2088
2089 vxlan_flush(vxlan);
2090
2091 return 0;
2092 }
2093
2094 /* Stub, nothing needs to be done. */
2095 static void vxlan_set_multicast_list(struct net_device *dev)
2096 {
2097 }
2098
2099 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2100 {
2101 struct vxlan_dev *vxlan = netdev_priv(dev);
2102 struct vxlan_rdst *dst = &vxlan->default_dst;
2103 struct net_device *lowerdev;
2104 int max_mtu;
2105
2106 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2107 if (lowerdev == NULL)
2108 return eth_change_mtu(dev, new_mtu);
2109
2110 if (dst->remote_ip.sa.sa_family == AF_INET6)
2111 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2112 else
2113 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2114
2115 if (new_mtu < 68 || new_mtu > max_mtu)
2116 return -EINVAL;
2117
2118 dev->mtu = new_mtu;
2119 return 0;
2120 }
2121
2122 static const struct net_device_ops vxlan_netdev_ops = {
2123 .ndo_init = vxlan_init,
2124 .ndo_uninit = vxlan_uninit,
2125 .ndo_open = vxlan_open,
2126 .ndo_stop = vxlan_stop,
2127 .ndo_start_xmit = vxlan_xmit,
2128 .ndo_get_stats64 = ip_tunnel_get_stats64,
2129 .ndo_set_rx_mode = vxlan_set_multicast_list,
2130 .ndo_change_mtu = vxlan_change_mtu,
2131 .ndo_validate_addr = eth_validate_addr,
2132 .ndo_set_mac_address = eth_mac_addr,
2133 .ndo_fdb_add = vxlan_fdb_add,
2134 .ndo_fdb_del = vxlan_fdb_delete,
2135 .ndo_fdb_dump = vxlan_fdb_dump,
2136 };
2137
2138 /* Info for udev, that this is a virtual tunnel endpoint */
2139 static struct device_type vxlan_type = {
2140 .name = "vxlan",
2141 };
2142
2143 /* Calls the ndo_add_vxlan_port of the caller in order to
2144 * supply the listening VXLAN udp ports. Callers are expected
2145 * to implement the ndo_add_vxlan_port.
2146 */
2147 void vxlan_get_rx_port(struct net_device *dev)
2148 {
2149 struct vxlan_sock *vs;
2150 struct net *net = dev_net(dev);
2151 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2152 sa_family_t sa_family;
2153 __be16 port;
2154 unsigned int i;
2155
2156 spin_lock(&vn->sock_lock);
2157 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2158 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2159 port = inet_sk(vs->sock->sk)->inet_sport;
2160 sa_family = vs->sock->sk->sk_family;
2161 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2162 port);
2163 }
2164 }
2165 spin_unlock(&vn->sock_lock);
2166 }
2167 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2168
2169 /* Initialize the device structure. */
2170 static void vxlan_setup(struct net_device *dev)
2171 {
2172 struct vxlan_dev *vxlan = netdev_priv(dev);
2173 unsigned int h;
2174
2175 eth_hw_addr_random(dev);
2176 ether_setup(dev);
2177 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2178 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2179 else
2180 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2181
2182 dev->netdev_ops = &vxlan_netdev_ops;
2183 dev->destructor = free_netdev;
2184 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2185
2186 dev->tx_queue_len = 0;
2187 dev->features |= NETIF_F_LLTX;
2188 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2189 dev->features |= NETIF_F_RXCSUM;
2190 dev->features |= NETIF_F_GSO_SOFTWARE;
2191
2192 dev->vlan_features = dev->features;
2193 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2194 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2195 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2196 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2197 netif_keep_dst(dev);
2198 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2199
2200 INIT_LIST_HEAD(&vxlan->next);
2201 spin_lock_init(&vxlan->hash_lock);
2202 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2203 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2204 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2205
2206 init_timer_deferrable(&vxlan->age_timer);
2207 vxlan->age_timer.function = vxlan_cleanup;
2208 vxlan->age_timer.data = (unsigned long) vxlan;
2209
2210 vxlan->dst_port = htons(vxlan_port);
2211
2212 vxlan->dev = dev;
2213
2214 for (h = 0; h < FDB_HASH_SIZE; ++h)
2215 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2216 }
2217
2218 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2219 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2220 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2221 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2222 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2223 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2224 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2225 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2226 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2227 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2228 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2229 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2230 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2231 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2232 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2233 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2234 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2235 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2236 };
2237
2238 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2239 {
2240 if (tb[IFLA_ADDRESS]) {
2241 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2242 pr_debug("invalid link address (not ethernet)\n");
2243 return -EINVAL;
2244 }
2245
2246 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2247 pr_debug("invalid all zero ethernet address\n");
2248 return -EADDRNOTAVAIL;
2249 }
2250 }
2251
2252 if (!data)
2253 return -EINVAL;
2254
2255 if (data[IFLA_VXLAN_ID]) {
2256 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2257 if (id >= VXLAN_VID_MASK)
2258 return -ERANGE;
2259 }
2260
2261 if (data[IFLA_VXLAN_PORT_RANGE]) {
2262 const struct ifla_vxlan_port_range *p
2263 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2264
2265 if (ntohs(p->high) < ntohs(p->low)) {
2266 pr_debug("port range %u .. %u not valid\n",
2267 ntohs(p->low), ntohs(p->high));
2268 return -EINVAL;
2269 }
2270 }
2271
2272 return 0;
2273 }
2274
2275 static void vxlan_get_drvinfo(struct net_device *netdev,
2276 struct ethtool_drvinfo *drvinfo)
2277 {
2278 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2279 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2280 }
2281
2282 static const struct ethtool_ops vxlan_ethtool_ops = {
2283 .get_drvinfo = vxlan_get_drvinfo,
2284 .get_link = ethtool_op_get_link,
2285 };
2286
2287 static void vxlan_del_work(struct work_struct *work)
2288 {
2289 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2290 udp_tunnel_sock_release(vs->sock);
2291 kfree_rcu(vs, rcu);
2292 }
2293
2294 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2295 __be16 port, u32 flags)
2296 {
2297 struct socket *sock;
2298 struct udp_port_cfg udp_conf;
2299 int err;
2300
2301 memset(&udp_conf, 0, sizeof(udp_conf));
2302
2303 if (ipv6) {
2304 udp_conf.family = AF_INET6;
2305 udp_conf.use_udp6_tx_checksums =
2306 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2307 udp_conf.use_udp6_rx_checksums =
2308 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2309 } else {
2310 udp_conf.family = AF_INET;
2311 udp_conf.local_ip.s_addr = INADDR_ANY;
2312 udp_conf.use_udp_checksums =
2313 !!(flags & VXLAN_F_UDP_CSUM);
2314 }
2315
2316 udp_conf.local_udp_port = port;
2317
2318 /* Open UDP socket */
2319 err = udp_sock_create(net, &udp_conf, &sock);
2320 if (err < 0)
2321 return ERR_PTR(err);
2322
2323 return sock;
2324 }
2325
2326 /* Create new listen socket if needed */
2327 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2328 vxlan_rcv_t *rcv, void *data,
2329 u32 flags)
2330 {
2331 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2332 struct vxlan_sock *vs;
2333 struct socket *sock;
2334 unsigned int h;
2335 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2336 struct udp_tunnel_sock_cfg tunnel_cfg;
2337
2338 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2339 if (!vs)
2340 return ERR_PTR(-ENOMEM);
2341
2342 for (h = 0; h < VNI_HASH_SIZE; ++h)
2343 INIT_HLIST_HEAD(&vs->vni_list[h]);
2344
2345 INIT_WORK(&vs->del_work, vxlan_del_work);
2346
2347 sock = vxlan_create_sock(net, ipv6, port, flags);
2348 if (IS_ERR(sock)) {
2349 kfree(vs);
2350 return ERR_CAST(sock);
2351 }
2352
2353 vs->sock = sock;
2354 atomic_set(&vs->refcnt, 1);
2355 vs->rcv = rcv;
2356 vs->data = data;
2357
2358 /* Initialize the vxlan udp offloads structure */
2359 vs->udp_offloads.port = port;
2360 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2361 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2362
2363 spin_lock(&vn->sock_lock);
2364 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2365 vxlan_notify_add_rx_port(vs);
2366 spin_unlock(&vn->sock_lock);
2367
2368 /* Mark socket as an encapsulation socket. */
2369 tunnel_cfg.sk_user_data = vs;
2370 tunnel_cfg.encap_type = 1;
2371 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2372 tunnel_cfg.encap_destroy = NULL;
2373
2374 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2375
2376 return vs;
2377 }
2378
2379 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2380 vxlan_rcv_t *rcv, void *data,
2381 bool no_share, u32 flags)
2382 {
2383 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2384 struct vxlan_sock *vs;
2385
2386 vs = vxlan_socket_create(net, port, rcv, data, flags);
2387 if (!IS_ERR(vs))
2388 return vs;
2389
2390 if (no_share) /* Return error if sharing is not allowed. */
2391 return vs;
2392
2393 spin_lock(&vn->sock_lock);
2394 vs = vxlan_find_sock(net, port);
2395 if (vs) {
2396 if (vs->rcv == rcv)
2397 atomic_inc(&vs->refcnt);
2398 else
2399 vs = ERR_PTR(-EBUSY);
2400 }
2401 spin_unlock(&vn->sock_lock);
2402
2403 if (!vs)
2404 vs = ERR_PTR(-EINVAL);
2405
2406 return vs;
2407 }
2408 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2409
2410 /* Scheduled at device creation to bind to a socket */
2411 static void vxlan_sock_work(struct work_struct *work)
2412 {
2413 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2414 struct net *net = vxlan->net;
2415 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2416 __be16 port = vxlan->dst_port;
2417 struct vxlan_sock *nvs;
2418
2419 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2420 spin_lock(&vn->sock_lock);
2421 if (!IS_ERR(nvs))
2422 vxlan_vs_add_dev(nvs, vxlan);
2423 spin_unlock(&vn->sock_lock);
2424
2425 dev_put(vxlan->dev);
2426 }
2427
2428 static int vxlan_newlink(struct net *net, struct net_device *dev,
2429 struct nlattr *tb[], struct nlattr *data[])
2430 {
2431 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2432 struct vxlan_dev *vxlan = netdev_priv(dev);
2433 struct vxlan_rdst *dst = &vxlan->default_dst;
2434 __u32 vni;
2435 int err;
2436 bool use_ipv6 = false;
2437
2438 if (!data[IFLA_VXLAN_ID])
2439 return -EINVAL;
2440
2441 vxlan->net = dev_net(dev);
2442
2443 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2444 dst->remote_vni = vni;
2445
2446 /* Unless IPv6 is explicitly requested, assume IPv4 */
2447 dst->remote_ip.sa.sa_family = AF_INET;
2448 if (data[IFLA_VXLAN_GROUP]) {
2449 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2450 } else if (data[IFLA_VXLAN_GROUP6]) {
2451 if (!IS_ENABLED(CONFIG_IPV6))
2452 return -EPFNOSUPPORT;
2453
2454 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2455 sizeof(struct in6_addr));
2456 dst->remote_ip.sa.sa_family = AF_INET6;
2457 use_ipv6 = true;
2458 }
2459
2460 if (data[IFLA_VXLAN_LOCAL]) {
2461 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2462 vxlan->saddr.sa.sa_family = AF_INET;
2463 } else if (data[IFLA_VXLAN_LOCAL6]) {
2464 if (!IS_ENABLED(CONFIG_IPV6))
2465 return -EPFNOSUPPORT;
2466
2467 /* TODO: respect scope id */
2468 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2469 sizeof(struct in6_addr));
2470 vxlan->saddr.sa.sa_family = AF_INET6;
2471 use_ipv6 = true;
2472 }
2473
2474 if (data[IFLA_VXLAN_LINK] &&
2475 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2476 struct net_device *lowerdev
2477 = __dev_get_by_index(net, dst->remote_ifindex);
2478
2479 if (!lowerdev) {
2480 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2481 return -ENODEV;
2482 }
2483
2484 #if IS_ENABLED(CONFIG_IPV6)
2485 if (use_ipv6) {
2486 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2487 if (idev && idev->cnf.disable_ipv6) {
2488 pr_info("IPv6 is disabled via sysctl\n");
2489 return -EPERM;
2490 }
2491 vxlan->flags |= VXLAN_F_IPV6;
2492 }
2493 #endif
2494
2495 if (!tb[IFLA_MTU])
2496 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2497
2498 dev->needed_headroom = lowerdev->hard_header_len +
2499 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2500 } else if (use_ipv6)
2501 vxlan->flags |= VXLAN_F_IPV6;
2502
2503 if (data[IFLA_VXLAN_TOS])
2504 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2505
2506 if (data[IFLA_VXLAN_TTL])
2507 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2508
2509 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2510 vxlan->flags |= VXLAN_F_LEARN;
2511
2512 if (data[IFLA_VXLAN_AGEING])
2513 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2514 else
2515 vxlan->age_interval = FDB_AGE_DEFAULT;
2516
2517 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2518 vxlan->flags |= VXLAN_F_PROXY;
2519
2520 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2521 vxlan->flags |= VXLAN_F_RSC;
2522
2523 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2524 vxlan->flags |= VXLAN_F_L2MISS;
2525
2526 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2527 vxlan->flags |= VXLAN_F_L3MISS;
2528
2529 if (data[IFLA_VXLAN_LIMIT])
2530 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2531
2532 if (data[IFLA_VXLAN_PORT_RANGE]) {
2533 const struct ifla_vxlan_port_range *p
2534 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2535 vxlan->port_min = ntohs(p->low);
2536 vxlan->port_max = ntohs(p->high);
2537 }
2538
2539 if (data[IFLA_VXLAN_PORT])
2540 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2541
2542 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2543 vxlan->flags |= VXLAN_F_UDP_CSUM;
2544
2545 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2546 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2547 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2548
2549 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2550 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2551 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2552
2553 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2554 pr_info("duplicate VNI %u\n", vni);
2555 return -EEXIST;
2556 }
2557
2558 dev->ethtool_ops = &vxlan_ethtool_ops;
2559
2560 /* create an fdb entry for a valid default destination */
2561 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2562 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2563 &vxlan->default_dst.remote_ip,
2564 NUD_REACHABLE|NUD_PERMANENT,
2565 NLM_F_EXCL|NLM_F_CREATE,
2566 vxlan->dst_port,
2567 vxlan->default_dst.remote_vni,
2568 vxlan->default_dst.remote_ifindex,
2569 NTF_SELF);
2570 if (err)
2571 return err;
2572 }
2573
2574 err = register_netdevice(dev);
2575 if (err) {
2576 vxlan_fdb_delete_default(vxlan);
2577 return err;
2578 }
2579
2580 list_add(&vxlan->next, &vn->vxlan_list);
2581
2582 return 0;
2583 }
2584
2585 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2586 {
2587 struct vxlan_dev *vxlan = netdev_priv(dev);
2588 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2589
2590 spin_lock(&vn->sock_lock);
2591 if (!hlist_unhashed(&vxlan->hlist))
2592 hlist_del_rcu(&vxlan->hlist);
2593 spin_unlock(&vn->sock_lock);
2594
2595 list_del(&vxlan->next);
2596 unregister_netdevice_queue(dev, head);
2597 }
2598
2599 static size_t vxlan_get_size(const struct net_device *dev)
2600 {
2601
2602 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2603 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2604 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2605 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2606 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2607 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2608 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2609 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2610 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2611 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2612 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2613 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2614 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2615 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2616 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2617 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2618 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2619 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2620 0;
2621 }
2622
2623 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2624 {
2625 const struct vxlan_dev *vxlan = netdev_priv(dev);
2626 const struct vxlan_rdst *dst = &vxlan->default_dst;
2627 struct ifla_vxlan_port_range ports = {
2628 .low = htons(vxlan->port_min),
2629 .high = htons(vxlan->port_max),
2630 };
2631
2632 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2633 goto nla_put_failure;
2634
2635 if (!vxlan_addr_any(&dst->remote_ip)) {
2636 if (dst->remote_ip.sa.sa_family == AF_INET) {
2637 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2638 dst->remote_ip.sin.sin_addr.s_addr))
2639 goto nla_put_failure;
2640 #if IS_ENABLED(CONFIG_IPV6)
2641 } else {
2642 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2643 &dst->remote_ip.sin6.sin6_addr))
2644 goto nla_put_failure;
2645 #endif
2646 }
2647 }
2648
2649 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2650 goto nla_put_failure;
2651
2652 if (!vxlan_addr_any(&vxlan->saddr)) {
2653 if (vxlan->saddr.sa.sa_family == AF_INET) {
2654 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2655 vxlan->saddr.sin.sin_addr.s_addr))
2656 goto nla_put_failure;
2657 #if IS_ENABLED(CONFIG_IPV6)
2658 } else {
2659 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2660 &vxlan->saddr.sin6.sin6_addr))
2661 goto nla_put_failure;
2662 #endif
2663 }
2664 }
2665
2666 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2667 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2668 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2669 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2670 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2671 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2672 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2673 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2674 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2675 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2676 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2677 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2678 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2679 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2680 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2681 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2682 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2683 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2684 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2685 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
2686 goto nla_put_failure;
2687
2688 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2689 goto nla_put_failure;
2690
2691 return 0;
2692
2693 nla_put_failure:
2694 return -EMSGSIZE;
2695 }
2696
2697 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2698 .kind = "vxlan",
2699 .maxtype = IFLA_VXLAN_MAX,
2700 .policy = vxlan_policy,
2701 .priv_size = sizeof(struct vxlan_dev),
2702 .setup = vxlan_setup,
2703 .validate = vxlan_validate,
2704 .newlink = vxlan_newlink,
2705 .dellink = vxlan_dellink,
2706 .get_size = vxlan_get_size,
2707 .fill_info = vxlan_fill_info,
2708 };
2709
2710 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2711 struct net_device *dev)
2712 {
2713 struct vxlan_dev *vxlan, *next;
2714 LIST_HEAD(list_kill);
2715
2716 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2717 struct vxlan_rdst *dst = &vxlan->default_dst;
2718
2719 /* In case we created vxlan device with carrier
2720 * and we loose the carrier due to module unload
2721 * we also need to remove vxlan device. In other
2722 * cases, it's not necessary and remote_ifindex
2723 * is 0 here, so no matches.
2724 */
2725 if (dst->remote_ifindex == dev->ifindex)
2726 vxlan_dellink(vxlan->dev, &list_kill);
2727 }
2728
2729 unregister_netdevice_many(&list_kill);
2730 }
2731
2732 static int vxlan_lowerdev_event(struct notifier_block *unused,
2733 unsigned long event, void *ptr)
2734 {
2735 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2736 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2737
2738 if (event == NETDEV_UNREGISTER)
2739 vxlan_handle_lowerdev_unregister(vn, dev);
2740
2741 return NOTIFY_DONE;
2742 }
2743
2744 static struct notifier_block vxlan_notifier_block __read_mostly = {
2745 .notifier_call = vxlan_lowerdev_event,
2746 };
2747
2748 static __net_init int vxlan_init_net(struct net *net)
2749 {
2750 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2751 unsigned int h;
2752
2753 INIT_LIST_HEAD(&vn->vxlan_list);
2754 spin_lock_init(&vn->sock_lock);
2755
2756 for (h = 0; h < PORT_HASH_SIZE; ++h)
2757 INIT_HLIST_HEAD(&vn->sock_list[h]);
2758
2759 return 0;
2760 }
2761
2762 static void __net_exit vxlan_exit_net(struct net *net)
2763 {
2764 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2765 struct vxlan_dev *vxlan, *next;
2766 struct net_device *dev, *aux;
2767 LIST_HEAD(list);
2768
2769 rtnl_lock();
2770 for_each_netdev_safe(net, dev, aux)
2771 if (dev->rtnl_link_ops == &vxlan_link_ops)
2772 unregister_netdevice_queue(dev, &list);
2773
2774 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2775 /* If vxlan->dev is in the same netns, it has already been added
2776 * to the list by the previous loop.
2777 */
2778 if (!net_eq(dev_net(vxlan->dev), net))
2779 unregister_netdevice_queue(dev, &list);
2780 }
2781
2782 unregister_netdevice_many(&list);
2783 rtnl_unlock();
2784 }
2785
2786 static struct pernet_operations vxlan_net_ops = {
2787 .init = vxlan_init_net,
2788 .exit = vxlan_exit_net,
2789 .id = &vxlan_net_id,
2790 .size = sizeof(struct vxlan_net),
2791 };
2792
2793 static int __init vxlan_init_module(void)
2794 {
2795 int rc;
2796
2797 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2798 if (!vxlan_wq)
2799 return -ENOMEM;
2800
2801 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2802
2803 rc = register_pernet_subsys(&vxlan_net_ops);
2804 if (rc)
2805 goto out1;
2806
2807 rc = register_netdevice_notifier(&vxlan_notifier_block);
2808 if (rc)
2809 goto out2;
2810
2811 rc = rtnl_link_register(&vxlan_link_ops);
2812 if (rc)
2813 goto out3;
2814
2815 return 0;
2816 out3:
2817 unregister_netdevice_notifier(&vxlan_notifier_block);
2818 out2:
2819 unregister_pernet_subsys(&vxlan_net_ops);
2820 out1:
2821 destroy_workqueue(vxlan_wq);
2822 return rc;
2823 }
2824 late_initcall(vxlan_init_module);
2825
2826 static void __exit vxlan_cleanup_module(void)
2827 {
2828 rtnl_link_unregister(&vxlan_link_ops);
2829 unregister_netdevice_notifier(&vxlan_notifier_block);
2830 destroy_workqueue(vxlan_wq);
2831 unregister_pernet_subsys(&vxlan_net_ops);
2832 /* rcu_barrier() is called by netns */
2833 }
2834 module_exit(vxlan_cleanup_module);
2835
2836 MODULE_LICENSE("GPL");
2837 MODULE_VERSION(VXLAN_VERSION);
2838 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2839 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2840 MODULE_ALIAS_RTNL_LINK("vxlan");
ubuntu-zesty-kernel mirror