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net/mlx4_en: Move filters cleanup to a proper location
[linux/fpc-iii.git] / drivers / net / vxlan.c
blobb3b9db68f758a2062a2f6bde2bfb9805d271cc6c
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
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 #include <net/dst_metadata.h>
53
54 #define VXLAN_VERSION "0.1"
55
56 #define PORT_HASH_BITS 8
57 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
61 /* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
63 * for compatibility with early adopters.
64 */
65 static unsigned short vxlan_port __read_mostly = 8472;
66 module_param_named(udp_port, vxlan_port, ushort, 0444);
67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
68
69 static bool log_ecn_error = true;
70 module_param(log_ecn_error, bool, 0644);
71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
72
73 static int vxlan_net_id;
74 static struct rtnl_link_ops vxlan_link_ops;
75
76 static const u8 all_zeros_mac[ETH_ALEN + 2];
77
78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
79
80 /* per-network namespace private data for this module */
81 struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
84 spinlock_t sock_lock;
85 };
86
87 /* Forwarding table entry */
88 struct vxlan_fdb {
89 struct hlist_node hlist; /* linked list of entries */
90 struct rcu_head rcu;
91 unsigned long updated; /* jiffies */
92 unsigned long used;
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
97 };
98
99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101
102 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
103 {
104 return vs->flags & VXLAN_F_COLLECT_METADATA ||
105 ip_tunnel_collect_metadata();
106 }
107
108 #if IS_ENABLED(CONFIG_IPV6)
109 static inline
110 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
111 {
112 if (a->sa.sa_family != b->sa.sa_family)
113 return false;
114 if (a->sa.sa_family == AF_INET6)
115 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
116 else
117 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
118 }
119
120 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
121 {
122 if (ipa->sa.sa_family == AF_INET6)
123 return ipv6_addr_any(&ipa->sin6.sin6_addr);
124 else
125 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
126 }
127
128 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
129 {
130 if (ipa->sa.sa_family == AF_INET6)
131 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
132 else
133 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
134 }
135
136 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
137 {
138 if (nla_len(nla) >= sizeof(struct in6_addr)) {
139 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
140 ip->sa.sa_family = AF_INET6;
141 return 0;
142 } else if (nla_len(nla) >= sizeof(__be32)) {
143 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
144 ip->sa.sa_family = AF_INET;
145 return 0;
146 } else {
147 return -EAFNOSUPPORT;
148 }
149 }
150
151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
152 const union vxlan_addr *ip)
153 {
154 if (ip->sa.sa_family == AF_INET6)
155 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
156 else
157 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
158 }
159
160 #else /* !CONFIG_IPV6 */
161
162 static inline
163 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
164 {
165 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
166 }
167
168 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
169 {
170 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
171 }
172
173 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
174 {
175 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
176 }
177
178 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
179 {
180 if (nla_len(nla) >= sizeof(struct in6_addr)) {
181 return -EAFNOSUPPORT;
182 } else if (nla_len(nla) >= sizeof(__be32)) {
183 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
184 ip->sa.sa_family = AF_INET;
185 return 0;
186 } else {
187 return -EAFNOSUPPORT;
188 }
189 }
190
191 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
192 const union vxlan_addr *ip)
193 {
194 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
195 }
196 #endif
197
198 /* Virtual Network hash table head */
199 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
200 {
201 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
202 }
203
204 /* Socket hash table head */
205 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
206 {
207 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
208
209 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
210 }
211
212 /* First remote destination for a forwarding entry.
213 * Guaranteed to be non-NULL because remotes are never deleted.
214 */
215 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
216 {
217 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
218 }
219
220 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
221 {
222 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
223 }
224
225 /* Find VXLAN socket based on network namespace, address family and UDP port
226 * and enabled unshareable flags.
227 */
228 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
229 __be16 port, u32 flags)
230 {
231 struct vxlan_sock *vs;
232
233 flags &= VXLAN_F_RCV_FLAGS;
234
235 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
236 if (inet_sk(vs->sock->sk)->inet_sport == port &&
237 vxlan_get_sk_family(vs) == family &&
238 vs->flags == flags)
239 return vs;
240 }
241 return NULL;
242 }
243
244 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
245 {
246 struct vxlan_dev *vxlan;
247
248 /* For flow based devices, map all packets to VNI 0 */
249 if (vs->flags & VXLAN_F_COLLECT_METADATA)
250 vni = 0;
251
252 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
253 if (vxlan->default_dst.remote_vni == vni)
254 return vxlan;
255 }
256
257 return NULL;
258 }
259
260 /* Look up VNI in a per net namespace table */
261 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
262 sa_family_t family, __be16 port,
263 u32 flags)
264 {
265 struct vxlan_sock *vs;
266
267 vs = vxlan_find_sock(net, family, port, flags);
268 if (!vs)
269 return NULL;
270
271 return vxlan_vs_find_vni(vs, vni);
272 }
273
274 /* Fill in neighbour message in skbuff. */
275 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
276 const struct vxlan_fdb *fdb,
277 u32 portid, u32 seq, int type, unsigned int flags,
278 const struct vxlan_rdst *rdst)
279 {
280 unsigned long now = jiffies;
281 struct nda_cacheinfo ci;
282 struct nlmsghdr *nlh;
283 struct ndmsg *ndm;
284 bool send_ip, send_eth;
285
286 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
287 if (nlh == NULL)
288 return -EMSGSIZE;
289
290 ndm = nlmsg_data(nlh);
291 memset(ndm, 0, sizeof(*ndm));
292
293 send_eth = send_ip = true;
294
295 if (type == RTM_GETNEIGH) {
296 ndm->ndm_family = AF_INET;
297 send_ip = !vxlan_addr_any(&rdst->remote_ip);
298 send_eth = !is_zero_ether_addr(fdb->eth_addr);
299 } else
300 ndm->ndm_family = AF_BRIDGE;
301 ndm->ndm_state = fdb->state;
302 ndm->ndm_ifindex = vxlan->dev->ifindex;
303 ndm->ndm_flags = fdb->flags;
304 ndm->ndm_type = RTN_UNICAST;
305
306 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
307 nla_put_s32(skb, NDA_LINK_NETNSID,
308 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
309 goto nla_put_failure;
310
311 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
312 goto nla_put_failure;
313
314 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
315 goto nla_put_failure;
316
317 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
318 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
319 goto nla_put_failure;
320 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
321 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
322 goto nla_put_failure;
323 if (rdst->remote_ifindex &&
324 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
325 goto nla_put_failure;
326
327 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
328 ci.ndm_confirmed = 0;
329 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
330 ci.ndm_refcnt = 0;
331
332 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
333 goto nla_put_failure;
334
335 nlmsg_end(skb, nlh);
336 return 0;
337
338 nla_put_failure:
339 nlmsg_cancel(skb, nlh);
340 return -EMSGSIZE;
341 }
342
343 static inline size_t vxlan_nlmsg_size(void)
344 {
345 return NLMSG_ALIGN(sizeof(struct ndmsg))
346 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
347 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
348 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
349 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
350 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
351 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
352 + nla_total_size(sizeof(struct nda_cacheinfo));
353 }
354
355 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
356 struct vxlan_rdst *rd, int type)
357 {
358 struct net *net = dev_net(vxlan->dev);
359 struct sk_buff *skb;
360 int err = -ENOBUFS;
361
362 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
363 if (skb == NULL)
364 goto errout;
365
366 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
367 if (err < 0) {
368 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
369 WARN_ON(err == -EMSGSIZE);
370 kfree_skb(skb);
371 goto errout;
372 }
373
374 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
375 return;
376 errout:
377 if (err < 0)
378 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
379 }
380
381 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
382 {
383 struct vxlan_dev *vxlan = netdev_priv(dev);
384 struct vxlan_fdb f = {
385 .state = NUD_STALE,
386 };
387 struct vxlan_rdst remote = {
388 .remote_ip = *ipa, /* goes to NDA_DST */
389 .remote_vni = cpu_to_be32(VXLAN_N_VID),
390 };
391
392 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
393 }
394
395 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
396 {
397 struct vxlan_fdb f = {
398 .state = NUD_STALE,
399 };
400 struct vxlan_rdst remote = { };
401
402 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
403
404 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
405 }
406
407 /* Hash Ethernet address */
408 static u32 eth_hash(const unsigned char *addr)
409 {
410 u64 value = get_unaligned((u64 *)addr);
411
412 /* only want 6 bytes */
413 #ifdef __BIG_ENDIAN
414 value >>= 16;
415 #else
416 value <<= 16;
417 #endif
418 return hash_64(value, FDB_HASH_BITS);
419 }
420
421 /* Hash chain to use given mac address */
422 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
423 const u8 *mac)
424 {
425 return &vxlan->fdb_head[eth_hash(mac)];
426 }
427
428 /* Look up Ethernet address in forwarding table */
429 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
430 const u8 *mac)
431 {
432 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
433 struct vxlan_fdb *f;
434
435 hlist_for_each_entry_rcu(f, head, hlist) {
436 if (ether_addr_equal(mac, f->eth_addr))
437 return f;
438 }
439
440 return NULL;
441 }
442
443 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
444 const u8 *mac)
445 {
446 struct vxlan_fdb *f;
447
448 f = __vxlan_find_mac(vxlan, mac);
449 if (f)
450 f->used = jiffies;
451
452 return f;
453 }
454
455 /* caller should hold vxlan->hash_lock */
456 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
457 union vxlan_addr *ip, __be16 port,
458 __be32 vni, __u32 ifindex)
459 {
460 struct vxlan_rdst *rd;
461
462 list_for_each_entry(rd, &f->remotes, list) {
463 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
464 rd->remote_port == port &&
465 rd->remote_vni == vni &&
466 rd->remote_ifindex == ifindex)
467 return rd;
468 }
469
470 return NULL;
471 }
472
473 /* Replace destination of unicast mac */
474 static int vxlan_fdb_replace(struct vxlan_fdb *f,
475 union vxlan_addr *ip, __be16 port, __be32 vni,
476 __u32 ifindex)
477 {
478 struct vxlan_rdst *rd;
479
480 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
481 if (rd)
482 return 0;
483
484 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
485 if (!rd)
486 return 0;
487
488 dst_cache_reset(&rd->dst_cache);
489 rd->remote_ip = *ip;
490 rd->remote_port = port;
491 rd->remote_vni = vni;
492 rd->remote_ifindex = ifindex;
493 return 1;
494 }
495
496 /* Add/update destinations for multicast */
497 static int vxlan_fdb_append(struct vxlan_fdb *f,
498 union vxlan_addr *ip, __be16 port, __be32 vni,
499 __u32 ifindex, struct vxlan_rdst **rdp)
500 {
501 struct vxlan_rdst *rd;
502
503 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
504 if (rd)
505 return 0;
506
507 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
508 if (rd == NULL)
509 return -ENOBUFS;
510
511 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
512 kfree(rd);
513 return -ENOBUFS;
514 }
515
516 rd->remote_ip = *ip;
517 rd->remote_port = port;
518 rd->remote_vni = vni;
519 rd->remote_ifindex = ifindex;
520
521 list_add_tail_rcu(&rd->list, &f->remotes);
522
523 *rdp = rd;
524 return 1;
525 }
526
527 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
528 unsigned int off,
529 struct vxlanhdr *vh, size_t hdrlen,
530 __be32 vni_field,
531 struct gro_remcsum *grc,
532 bool nopartial)
533 {
534 size_t start, offset;
535
536 if (skb->remcsum_offload)
537 return vh;
538
539 if (!NAPI_GRO_CB(skb)->csum_valid)
540 return NULL;
541
542 start = vxlan_rco_start(vni_field);
543 offset = start + vxlan_rco_offset(vni_field);
544
545 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
546 start, offset, grc, nopartial);
547
548 skb->remcsum_offload = 1;
549
550 return vh;
551 }
552
553 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
554 struct sk_buff **head,
555 struct sk_buff *skb)
556 {
557 struct sk_buff *p, **pp = NULL;
558 struct vxlanhdr *vh, *vh2;
559 unsigned int hlen, off_vx;
560 int flush = 1;
561 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
562 __be32 flags;
563 struct gro_remcsum grc;
564
565 skb_gro_remcsum_init(&grc);
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
576 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
577
578 flags = vh->vx_flags;
579
580 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
581 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
582 vh->vx_vni, &grc,
583 !!(vs->flags &
584 VXLAN_F_REMCSUM_NOPARTIAL));
585
586 if (!vh)
587 goto out;
588 }
589
590 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
591
592 for (p = *head; p; p = p->next) {
593 if (!NAPI_GRO_CB(p)->same_flow)
594 continue;
595
596 vh2 = (struct vxlanhdr *)(p->data + off_vx);
597 if (vh->vx_flags != vh2->vx_flags ||
598 vh->vx_vni != vh2->vx_vni) {
599 NAPI_GRO_CB(p)->same_flow = 0;
600 continue;
601 }
602 }
603
604 pp = eth_gro_receive(head, skb);
605 flush = 0;
606
607 out:
608 skb_gro_remcsum_cleanup(skb, &grc);
609 NAPI_GRO_CB(skb)->flush |= flush;
610
611 return pp;
612 }
613
614 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
615 {
616 /* Sets 'skb->inner_mac_header' since we are always called with
617 * 'skb->encapsulation' set.
618 */
619 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
620 }
621
622 /* Notify netdevs that UDP port started listening */
623 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
624 {
625 struct net_device *dev;
626 struct sock *sk = vs->sock->sk;
627 struct net *net = sock_net(sk);
628 sa_family_t sa_family = vxlan_get_sk_family(vs);
629 __be16 port = inet_sk(sk)->inet_sport;
630
631 rcu_read_lock();
632 for_each_netdev_rcu(net, dev) {
633 if (dev->netdev_ops->ndo_add_vxlan_port)
634 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
635 port);
636 }
637 rcu_read_unlock();
638 }
639
640 /* Notify netdevs that UDP port is no more listening */
641 static void vxlan_notify_del_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 = vxlan_get_sk_family(vs);
647 __be16 port = inet_sk(sk)->inet_sport;
648
649 rcu_read_lock();
650 for_each_netdev_rcu(net, dev) {
651 if (dev->netdev_ops->ndo_del_vxlan_port)
652 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
653 port);
654 }
655 rcu_read_unlock();
656 }
657
658 /* Add new entry to forwarding table -- assumes lock held */
659 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
660 const u8 *mac, union vxlan_addr *ip,
661 __u16 state, __u16 flags,
662 __be16 port, __be32 vni, __u32 ifindex,
663 __u8 ndm_flags)
664 {
665 struct vxlan_rdst *rd = NULL;
666 struct vxlan_fdb *f;
667 int notify = 0;
668
669 f = __vxlan_find_mac(vxlan, mac);
670 if (f) {
671 if (flags & NLM_F_EXCL) {
672 netdev_dbg(vxlan->dev,
673 "lost race to create %pM\n", mac);
674 return -EEXIST;
675 }
676 if (f->state != state) {
677 f->state = state;
678 f->updated = jiffies;
679 notify = 1;
680 }
681 if (f->flags != ndm_flags) {
682 f->flags = ndm_flags;
683 f->updated = jiffies;
684 notify = 1;
685 }
686 if ((flags & NLM_F_REPLACE)) {
687 /* Only change unicasts */
688 if (!(is_multicast_ether_addr(f->eth_addr) ||
689 is_zero_ether_addr(f->eth_addr))) {
690 notify |= vxlan_fdb_replace(f, ip, port, vni,
691 ifindex);
692 } else
693 return -EOPNOTSUPP;
694 }
695 if ((flags & NLM_F_APPEND) &&
696 (is_multicast_ether_addr(f->eth_addr) ||
697 is_zero_ether_addr(f->eth_addr))) {
698 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
699 &rd);
700
701 if (rc < 0)
702 return rc;
703 notify |= rc;
704 }
705 } else {
706 if (!(flags & NLM_F_CREATE))
707 return -ENOENT;
708
709 if (vxlan->cfg.addrmax &&
710 vxlan->addrcnt >= vxlan->cfg.addrmax)
711 return -ENOSPC;
712
713 /* Disallow replace to add a multicast entry */
714 if ((flags & NLM_F_REPLACE) &&
715 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
716 return -EOPNOTSUPP;
717
718 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
719 f = kmalloc(sizeof(*f), GFP_ATOMIC);
720 if (!f)
721 return -ENOMEM;
722
723 notify = 1;
724 f->state = state;
725 f->flags = ndm_flags;
726 f->updated = f->used = jiffies;
727 INIT_LIST_HEAD(&f->remotes);
728 memcpy(f->eth_addr, mac, ETH_ALEN);
729
730 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
731
732 ++vxlan->addrcnt;
733 hlist_add_head_rcu(&f->hlist,
734 vxlan_fdb_head(vxlan, mac));
735 }
736
737 if (notify) {
738 if (rd == NULL)
739 rd = first_remote_rtnl(f);
740 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
741 }
742
743 return 0;
744 }
745
746 static void vxlan_fdb_free(struct rcu_head *head)
747 {
748 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
749 struct vxlan_rdst *rd, *nd;
750
751 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
752 dst_cache_destroy(&rd->dst_cache);
753 kfree(rd);
754 }
755 kfree(f);
756 }
757
758 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
759 {
760 netdev_dbg(vxlan->dev,
761 "delete %pM\n", f->eth_addr);
762
763 --vxlan->addrcnt;
764 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
765
766 hlist_del_rcu(&f->hlist);
767 call_rcu(&f->rcu, vxlan_fdb_free);
768 }
769
770 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
771 union vxlan_addr *ip, __be16 *port, __be32 *vni,
772 u32 *ifindex)
773 {
774 struct net *net = dev_net(vxlan->dev);
775 int err;
776
777 if (tb[NDA_DST]) {
778 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
779 if (err)
780 return err;
781 } else {
782 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
783 if (remote->sa.sa_family == AF_INET) {
784 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
785 ip->sa.sa_family = AF_INET;
786 #if IS_ENABLED(CONFIG_IPV6)
787 } else {
788 ip->sin6.sin6_addr = in6addr_any;
789 ip->sa.sa_family = AF_INET6;
790 #endif
791 }
792 }
793
794 if (tb[NDA_PORT]) {
795 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
796 return -EINVAL;
797 *port = nla_get_be16(tb[NDA_PORT]);
798 } else {
799 *port = vxlan->cfg.dst_port;
800 }
801
802 if (tb[NDA_VNI]) {
803 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
804 return -EINVAL;
805 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
806 } else {
807 *vni = vxlan->default_dst.remote_vni;
808 }
809
810 if (tb[NDA_IFINDEX]) {
811 struct net_device *tdev;
812
813 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
814 return -EINVAL;
815 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
816 tdev = __dev_get_by_index(net, *ifindex);
817 if (!tdev)
818 return -EADDRNOTAVAIL;
819 } else {
820 *ifindex = 0;
821 }
822
823 return 0;
824 }
825
826 /* Add static entry (via netlink) */
827 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
828 struct net_device *dev,
829 const unsigned char *addr, u16 vid, u16 flags)
830 {
831 struct vxlan_dev *vxlan = netdev_priv(dev);
832 /* struct net *net = dev_net(vxlan->dev); */
833 union vxlan_addr ip;
834 __be16 port;
835 __be32 vni;
836 u32 ifindex;
837 int err;
838
839 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
840 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
841 ndm->ndm_state);
842 return -EINVAL;
843 }
844
845 if (tb[NDA_DST] == NULL)
846 return -EINVAL;
847
848 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
849 if (err)
850 return err;
851
852 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
853 return -EAFNOSUPPORT;
854
855 spin_lock_bh(&vxlan->hash_lock);
856 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
857 port, vni, ifindex, ndm->ndm_flags);
858 spin_unlock_bh(&vxlan->hash_lock);
859
860 return err;
861 }
862
863 /* Delete entry (via netlink) */
864 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
865 struct net_device *dev,
866 const unsigned char *addr, u16 vid)
867 {
868 struct vxlan_dev *vxlan = netdev_priv(dev);
869 struct vxlan_fdb *f;
870 struct vxlan_rdst *rd = NULL;
871 union vxlan_addr ip;
872 __be16 port;
873 __be32 vni;
874 u32 ifindex;
875 int err;
876
877 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
878 if (err)
879 return err;
880
881 err = -ENOENT;
882
883 spin_lock_bh(&vxlan->hash_lock);
884 f = vxlan_find_mac(vxlan, addr);
885 if (!f)
886 goto out;
887
888 if (!vxlan_addr_any(&ip)) {
889 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
890 if (!rd)
891 goto out;
892 }
893
894 err = 0;
895
896 /* remove a destination if it's not the only one on the list,
897 * otherwise destroy the fdb entry
898 */
899 if (rd && !list_is_singular(&f->remotes)) {
900 list_del_rcu(&rd->list);
901 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
902 kfree_rcu(rd, rcu);
903 goto out;
904 }
905
906 vxlan_fdb_destroy(vxlan, f);
907
908 out:
909 spin_unlock_bh(&vxlan->hash_lock);
910
911 return err;
912 }
913
914 /* Dump forwarding table */
915 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
916 struct net_device *dev,
917 struct net_device *filter_dev, int idx)
918 {
919 struct vxlan_dev *vxlan = netdev_priv(dev);
920 unsigned int h;
921
922 for (h = 0; h < FDB_HASH_SIZE; ++h) {
923 struct vxlan_fdb *f;
924 int err;
925
926 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
927 struct vxlan_rdst *rd;
928
929 list_for_each_entry_rcu(rd, &f->remotes, list) {
930 if (idx < cb->args[0])
931 goto skip;
932
933 err = vxlan_fdb_info(skb, vxlan, f,
934 NETLINK_CB(cb->skb).portid,
935 cb->nlh->nlmsg_seq,
936 RTM_NEWNEIGH,
937 NLM_F_MULTI, rd);
938 if (err < 0) {
939 cb->args[1] = err;
940 goto out;
941 }
942 skip:
943 ++idx;
944 }
945 }
946 }
947 out:
948 return idx;
949 }
950
951 /* Watch incoming packets to learn mapping between Ethernet address
952 * and Tunnel endpoint.
953 * Return true if packet is bogus and should be dropped.
954 */
955 static bool vxlan_snoop(struct net_device *dev,
956 union vxlan_addr *src_ip, const u8 *src_mac)
957 {
958 struct vxlan_dev *vxlan = netdev_priv(dev);
959 struct vxlan_fdb *f;
960
961 f = vxlan_find_mac(vxlan, src_mac);
962 if (likely(f)) {
963 struct vxlan_rdst *rdst = first_remote_rcu(f);
964
965 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
966 return false;
967
968 /* Don't migrate static entries, drop packets */
969 if (f->state & NUD_NOARP)
970 return true;
971
972 if (net_ratelimit())
973 netdev_info(dev,
974 "%pM migrated from %pIS to %pIS\n",
975 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
976
977 rdst->remote_ip = *src_ip;
978 f->updated = jiffies;
979 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
980 } else {
981 /* learned new entry */
982 spin_lock(&vxlan->hash_lock);
983
984 /* close off race between vxlan_flush and incoming packets */
985 if (netif_running(dev))
986 vxlan_fdb_create(vxlan, src_mac, src_ip,
987 NUD_REACHABLE,
988 NLM_F_EXCL|NLM_F_CREATE,
989 vxlan->cfg.dst_port,
990 vxlan->default_dst.remote_vni,
991 0, NTF_SELF);
992 spin_unlock(&vxlan->hash_lock);
993 }
994
995 return false;
996 }
997
998 /* See if multicast group is already in use by other ID */
999 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1000 {
1001 struct vxlan_dev *vxlan;
1002 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1003
1004 /* The vxlan_sock is only used by dev, leaving group has
1005 * no effect on other vxlan devices.
1006 */
1007 if (family == AF_INET && dev->vn4_sock &&
1008 atomic_read(&dev->vn4_sock->refcnt) == 1)
1009 return false;
1010 #if IS_ENABLED(CONFIG_IPV6)
1011 if (family == AF_INET6 && dev->vn6_sock &&
1012 atomic_read(&dev->vn6_sock->refcnt) == 1)
1013 return false;
1014 #endif
1015
1016 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1017 if (!netif_running(vxlan->dev) || vxlan == dev)
1018 continue;
1019
1020 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1021 continue;
1022 #if IS_ENABLED(CONFIG_IPV6)
1023 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1024 continue;
1025 #endif
1026
1027 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1028 &dev->default_dst.remote_ip))
1029 continue;
1030
1031 if (vxlan->default_dst.remote_ifindex !=
1032 dev->default_dst.remote_ifindex)
1033 continue;
1034
1035 return true;
1036 }
1037
1038 return false;
1039 }
1040
1041 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1042 {
1043 struct vxlan_net *vn;
1044
1045 if (!vs)
1046 return false;
1047 if (!atomic_dec_and_test(&vs->refcnt))
1048 return false;
1049
1050 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1051 spin_lock(&vn->sock_lock);
1052 hlist_del_rcu(&vs->hlist);
1053 vxlan_notify_del_rx_port(vs);
1054 spin_unlock(&vn->sock_lock);
1055
1056 return true;
1057 }
1058
1059 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1060 {
1061 bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock);
1062 #if IS_ENABLED(CONFIG_IPV6)
1063 bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock);
1064 #endif
1065
1066 synchronize_net();
1067
1068 if (ipv4) {
1069 udp_tunnel_sock_release(vxlan->vn4_sock->sock);
1070 kfree(vxlan->vn4_sock);
1071 }
1072
1073 #if IS_ENABLED(CONFIG_IPV6)
1074 if (ipv6) {
1075 udp_tunnel_sock_release(vxlan->vn6_sock->sock);
1076 kfree(vxlan->vn6_sock);
1077 }
1078 #endif
1079 }
1080
1081 /* Update multicast group membership when first VNI on
1082 * multicast address is brought up
1083 */
1084 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1085 {
1086 struct sock *sk;
1087 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1088 int ifindex = vxlan->default_dst.remote_ifindex;
1089 int ret = -EINVAL;
1090
1091 if (ip->sa.sa_family == AF_INET) {
1092 struct ip_mreqn mreq = {
1093 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1094 .imr_ifindex = ifindex,
1095 };
1096
1097 sk = vxlan->vn4_sock->sock->sk;
1098 lock_sock(sk);
1099 ret = ip_mc_join_group(sk, &mreq);
1100 release_sock(sk);
1101 #if IS_ENABLED(CONFIG_IPV6)
1102 } else {
1103 sk = vxlan->vn6_sock->sock->sk;
1104 lock_sock(sk);
1105 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1106 &ip->sin6.sin6_addr);
1107 release_sock(sk);
1108 #endif
1109 }
1110
1111 return ret;
1112 }
1113
1114 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1115 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1116 {
1117 struct sock *sk;
1118 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1119 int ifindex = vxlan->default_dst.remote_ifindex;
1120 int ret = -EINVAL;
1121
1122 if (ip->sa.sa_family == AF_INET) {
1123 struct ip_mreqn mreq = {
1124 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1125 .imr_ifindex = ifindex,
1126 };
1127
1128 sk = vxlan->vn4_sock->sock->sk;
1129 lock_sock(sk);
1130 ret = ip_mc_leave_group(sk, &mreq);
1131 release_sock(sk);
1132 #if IS_ENABLED(CONFIG_IPV6)
1133 } else {
1134 sk = vxlan->vn6_sock->sock->sk;
1135 lock_sock(sk);
1136 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1137 &ip->sin6.sin6_addr);
1138 release_sock(sk);
1139 #endif
1140 }
1141
1142 return ret;
1143 }
1144
1145 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1146 struct sk_buff *skb, u32 vxflags)
1147 {
1148 size_t start, offset;
1149
1150 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1151 goto out;
1152
1153 start = vxlan_rco_start(unparsed->vx_vni);
1154 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1155
1156 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1157 return false;
1158
1159 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1160 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1161 out:
1162 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1163 unparsed->vx_vni &= VXLAN_VNI_MASK;
1164 return true;
1165 }
1166
1167 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1168 struct sk_buff *skb, u32 vxflags,
1169 struct vxlan_metadata *md)
1170 {
1171 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1172 struct metadata_dst *tun_dst;
1173
1174 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1175 goto out;
1176
1177 md->gbp = ntohs(gbp->policy_id);
1178
1179 tun_dst = (struct metadata_dst *)skb_dst(skb);
1180 if (tun_dst) {
1181 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1182 tun_dst->u.tun_info.options_len = sizeof(*md);
1183 }
1184 if (gbp->dont_learn)
1185 md->gbp |= VXLAN_GBP_DONT_LEARN;
1186
1187 if (gbp->policy_applied)
1188 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1189
1190 /* In flow-based mode, GBP is carried in dst_metadata */
1191 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1192 skb->mark = md->gbp;
1193 out:
1194 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1195 }
1196
1197 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1198 __be16 *protocol,
1199 struct sk_buff *skb, u32 vxflags)
1200 {
1201 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1202
1203 /* Need to have Next Protocol set for interfaces in GPE mode. */
1204 if (!gpe->np_applied)
1205 return false;
1206 /* "The initial version is 0. If a receiver does not support the
1207 * version indicated it MUST drop the packet.
1208 */
1209 if (gpe->version != 0)
1210 return false;
1211 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1212 * processing MUST occur." However, we don't implement OAM
1213 * processing, thus drop the packet.
1214 */
1215 if (gpe->oam_flag)
1216 return false;
1217
1218 switch (gpe->next_protocol) {
1219 case VXLAN_GPE_NP_IPV4:
1220 *protocol = htons(ETH_P_IP);
1221 break;
1222 case VXLAN_GPE_NP_IPV6:
1223 *protocol = htons(ETH_P_IPV6);
1224 break;
1225 case VXLAN_GPE_NP_ETHERNET:
1226 *protocol = htons(ETH_P_TEB);
1227 break;
1228 default:
1229 return false;
1230 }
1231
1232 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1233 return true;
1234 }
1235
1236 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1237 struct vxlan_sock *vs,
1238 struct sk_buff *skb)
1239 {
1240 union vxlan_addr saddr;
1241
1242 skb_reset_mac_header(skb);
1243 skb->protocol = eth_type_trans(skb, vxlan->dev);
1244 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1245
1246 /* Ignore packet loops (and multicast echo) */
1247 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1248 return false;
1249
1250 /* Get address from the outer IP header */
1251 if (vxlan_get_sk_family(vs) == AF_INET) {
1252 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1253 saddr.sa.sa_family = AF_INET;
1254 #if IS_ENABLED(CONFIG_IPV6)
1255 } else {
1256 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1257 saddr.sa.sa_family = AF_INET6;
1258 #endif
1259 }
1260
1261 if ((vxlan->flags & VXLAN_F_LEARN) &&
1262 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1263 return false;
1264
1265 return true;
1266 }
1267
1268 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1269 struct sk_buff *skb)
1270 {
1271 int err = 0;
1272
1273 if (vxlan_get_sk_family(vs) == AF_INET)
1274 err = IP_ECN_decapsulate(oiph, skb);
1275 #if IS_ENABLED(CONFIG_IPV6)
1276 else
1277 err = IP6_ECN_decapsulate(oiph, skb);
1278 #endif
1279
1280 if (unlikely(err) && log_ecn_error) {
1281 if (vxlan_get_sk_family(vs) == AF_INET)
1282 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1283 &((struct iphdr *)oiph)->saddr,
1284 ((struct iphdr *)oiph)->tos);
1285 else
1286 net_info_ratelimited("non-ECT from %pI6\n",
1287 &((struct ipv6hdr *)oiph)->saddr);
1288 }
1289 return err <= 1;
1290 }
1291
1292 /* Callback from net/ipv4/udp.c to receive packets */
1293 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1294 {
1295 struct pcpu_sw_netstats *stats;
1296 struct vxlan_dev *vxlan;
1297 struct vxlan_sock *vs;
1298 struct vxlanhdr unparsed;
1299 struct vxlan_metadata _md;
1300 struct vxlan_metadata *md = &_md;
1301 __be16 protocol = htons(ETH_P_TEB);
1302 bool raw_proto = false;
1303 void *oiph;
1304
1305 /* Need UDP and VXLAN header to be present */
1306 if (!pskb_may_pull(skb, VXLAN_HLEN))
1307 goto drop;
1308
1309 unparsed = *vxlan_hdr(skb);
1310 /* VNI flag always required to be set */
1311 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1312 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1313 ntohl(vxlan_hdr(skb)->vx_flags),
1314 ntohl(vxlan_hdr(skb)->vx_vni));
1315 /* Return non vxlan pkt */
1316 goto drop;
1317 }
1318 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1319 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1320
1321 vs = rcu_dereference_sk_user_data(sk);
1322 if (!vs)
1323 goto drop;
1324
1325 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1326 if (!vxlan)
1327 goto drop;
1328
1329 /* For backwards compatibility, only allow reserved fields to be
1330 * used by VXLAN extensions if explicitly requested.
1331 */
1332 if (vs->flags & VXLAN_F_GPE) {
1333 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1334 goto drop;
1335 raw_proto = true;
1336 }
1337
1338 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1339 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1340 goto drop;
1341
1342 if (vxlan_collect_metadata(vs)) {
1343 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1344 struct metadata_dst *tun_dst;
1345
1346 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1347 vxlan_vni_to_tun_id(vni), sizeof(*md));
1348
1349 if (!tun_dst)
1350 goto drop;
1351
1352 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1353
1354 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1355 } else {
1356 memset(md, 0, sizeof(*md));
1357 }
1358
1359 if (vs->flags & VXLAN_F_REMCSUM_RX)
1360 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1361 goto drop;
1362 if (vs->flags & VXLAN_F_GBP)
1363 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1364 /* Note that GBP and GPE can never be active together. This is
1365 * ensured in vxlan_dev_configure.
1366 */
1367
1368 if (unparsed.vx_flags || unparsed.vx_vni) {
1369 /* If there are any unprocessed flags remaining treat
1370 * this as a malformed packet. This behavior diverges from
1371 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1372 * in reserved fields are to be ignored. The approach here
1373 * maintains compatibility with previous stack code, and also
1374 * is more robust and provides a little more security in
1375 * adding extensions to VXLAN.
1376 */
1377 goto drop;
1378 }
1379
1380 if (!raw_proto) {
1381 if (!vxlan_set_mac(vxlan, vs, skb))
1382 goto drop;
1383 } else {
1384 skb_reset_mac_header(skb);
1385 skb->dev = vxlan->dev;
1386 skb->pkt_type = PACKET_HOST;
1387 }
1388
1389 oiph = skb_network_header(skb);
1390 skb_reset_network_header(skb);
1391
1392 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1393 ++vxlan->dev->stats.rx_frame_errors;
1394 ++vxlan->dev->stats.rx_errors;
1395 goto drop;
1396 }
1397
1398 stats = this_cpu_ptr(vxlan->dev->tstats);
1399 u64_stats_update_begin(&stats->syncp);
1400 stats->rx_packets++;
1401 stats->rx_bytes += skb->len;
1402 u64_stats_update_end(&stats->syncp);
1403
1404 gro_cells_receive(&vxlan->gro_cells, skb);
1405 return 0;
1406
1407 drop:
1408 /* Consume bad packet */
1409 kfree_skb(skb);
1410 return 0;
1411 }
1412
1413 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1414 {
1415 struct vxlan_dev *vxlan = netdev_priv(dev);
1416 struct arphdr *parp;
1417 u8 *arpptr, *sha;
1418 __be32 sip, tip;
1419 struct neighbour *n;
1420
1421 if (dev->flags & IFF_NOARP)
1422 goto out;
1423
1424 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1425 dev->stats.tx_dropped++;
1426 goto out;
1427 }
1428 parp = arp_hdr(skb);
1429
1430 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1431 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1432 parp->ar_pro != htons(ETH_P_IP) ||
1433 parp->ar_op != htons(ARPOP_REQUEST) ||
1434 parp->ar_hln != dev->addr_len ||
1435 parp->ar_pln != 4)
1436 goto out;
1437 arpptr = (u8 *)parp + sizeof(struct arphdr);
1438 sha = arpptr;
1439 arpptr += dev->addr_len; /* sha */
1440 memcpy(&sip, arpptr, sizeof(sip));
1441 arpptr += sizeof(sip);
1442 arpptr += dev->addr_len; /* tha */
1443 memcpy(&tip, arpptr, sizeof(tip));
1444
1445 if (ipv4_is_loopback(tip) ||
1446 ipv4_is_multicast(tip))
1447 goto out;
1448
1449 n = neigh_lookup(&arp_tbl, &tip, dev);
1450
1451 if (n) {
1452 struct vxlan_fdb *f;
1453 struct sk_buff *reply;
1454
1455 if (!(n->nud_state & NUD_CONNECTED)) {
1456 neigh_release(n);
1457 goto out;
1458 }
1459
1460 f = vxlan_find_mac(vxlan, n->ha);
1461 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1462 /* bridge-local neighbor */
1463 neigh_release(n);
1464 goto out;
1465 }
1466
1467 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1468 n->ha, sha);
1469
1470 neigh_release(n);
1471
1472 if (reply == NULL)
1473 goto out;
1474
1475 skb_reset_mac_header(reply);
1476 __skb_pull(reply, skb_network_offset(reply));
1477 reply->ip_summed = CHECKSUM_UNNECESSARY;
1478 reply->pkt_type = PACKET_HOST;
1479
1480 if (netif_rx_ni(reply) == NET_RX_DROP)
1481 dev->stats.rx_dropped++;
1482 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1483 union vxlan_addr ipa = {
1484 .sin.sin_addr.s_addr = tip,
1485 .sin.sin_family = AF_INET,
1486 };
1487
1488 vxlan_ip_miss(dev, &ipa);
1489 }
1490 out:
1491 consume_skb(skb);
1492 return NETDEV_TX_OK;
1493 }
1494
1495 #if IS_ENABLED(CONFIG_IPV6)
1496 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1497 struct neighbour *n, bool isrouter)
1498 {
1499 struct net_device *dev = request->dev;
1500 struct sk_buff *reply;
1501 struct nd_msg *ns, *na;
1502 struct ipv6hdr *pip6;
1503 u8 *daddr;
1504 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1505 int ns_olen;
1506 int i, len;
1507
1508 if (dev == NULL)
1509 return NULL;
1510
1511 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1512 sizeof(*na) + na_olen + dev->needed_tailroom;
1513 reply = alloc_skb(len, GFP_ATOMIC);
1514 if (reply == NULL)
1515 return NULL;
1516
1517 reply->protocol = htons(ETH_P_IPV6);
1518 reply->dev = dev;
1519 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1520 skb_push(reply, sizeof(struct ethhdr));
1521 skb_reset_mac_header(reply);
1522
1523 ns = (struct nd_msg *)skb_transport_header(request);
1524
1525 daddr = eth_hdr(request)->h_source;
1526 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1527 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1528 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1529 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1530 break;
1531 }
1532 }
1533
1534 /* Ethernet header */
1535 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1536 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1537 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1538 reply->protocol = htons(ETH_P_IPV6);
1539
1540 skb_pull(reply, sizeof(struct ethhdr));
1541 skb_reset_network_header(reply);
1542 skb_put(reply, sizeof(struct ipv6hdr));
1543
1544 /* IPv6 header */
1545
1546 pip6 = ipv6_hdr(reply);
1547 memset(pip6, 0, sizeof(struct ipv6hdr));
1548 pip6->version = 6;
1549 pip6->priority = ipv6_hdr(request)->priority;
1550 pip6->nexthdr = IPPROTO_ICMPV6;
1551 pip6->hop_limit = 255;
1552 pip6->daddr = ipv6_hdr(request)->saddr;
1553 pip6->saddr = *(struct in6_addr *)n->primary_key;
1554
1555 skb_pull(reply, sizeof(struct ipv6hdr));
1556 skb_reset_transport_header(reply);
1557
1558 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1559
1560 /* Neighbor Advertisement */
1561 memset(na, 0, sizeof(*na)+na_olen);
1562 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1563 na->icmph.icmp6_router = isrouter;
1564 na->icmph.icmp6_override = 1;
1565 na->icmph.icmp6_solicited = 1;
1566 na->target = ns->target;
1567 ether_addr_copy(&na->opt[2], n->ha);
1568 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1569 na->opt[1] = na_olen >> 3;
1570
1571 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1572 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1573 csum_partial(na, sizeof(*na)+na_olen, 0));
1574
1575 pip6->payload_len = htons(sizeof(*na)+na_olen);
1576
1577 skb_push(reply, sizeof(struct ipv6hdr));
1578
1579 reply->ip_summed = CHECKSUM_UNNECESSARY;
1580
1581 return reply;
1582 }
1583
1584 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1585 {
1586 struct vxlan_dev *vxlan = netdev_priv(dev);
1587 struct nd_msg *msg;
1588 const struct ipv6hdr *iphdr;
1589 const struct in6_addr *saddr, *daddr;
1590 struct neighbour *n;
1591 struct inet6_dev *in6_dev;
1592
1593 in6_dev = __in6_dev_get(dev);
1594 if (!in6_dev)
1595 goto out;
1596
1597 iphdr = ipv6_hdr(skb);
1598 saddr = &iphdr->saddr;
1599 daddr = &iphdr->daddr;
1600
1601 msg = (struct nd_msg *)skb_transport_header(skb);
1602 if (msg->icmph.icmp6_code != 0 ||
1603 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1604 goto out;
1605
1606 if (ipv6_addr_loopback(daddr) ||
1607 ipv6_addr_is_multicast(&msg->target))
1608 goto out;
1609
1610 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1611
1612 if (n) {
1613 struct vxlan_fdb *f;
1614 struct sk_buff *reply;
1615
1616 if (!(n->nud_state & NUD_CONNECTED)) {
1617 neigh_release(n);
1618 goto out;
1619 }
1620
1621 f = vxlan_find_mac(vxlan, n->ha);
1622 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1623 /* bridge-local neighbor */
1624 neigh_release(n);
1625 goto out;
1626 }
1627
1628 reply = vxlan_na_create(skb, n,
1629 !!(f ? f->flags & NTF_ROUTER : 0));
1630
1631 neigh_release(n);
1632
1633 if (reply == NULL)
1634 goto out;
1635
1636 if (netif_rx_ni(reply) == NET_RX_DROP)
1637 dev->stats.rx_dropped++;
1638
1639 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1640 union vxlan_addr ipa = {
1641 .sin6.sin6_addr = msg->target,
1642 .sin6.sin6_family = AF_INET6,
1643 };
1644
1645 vxlan_ip_miss(dev, &ipa);
1646 }
1647
1648 out:
1649 consume_skb(skb);
1650 return NETDEV_TX_OK;
1651 }
1652 #endif
1653
1654 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1655 {
1656 struct vxlan_dev *vxlan = netdev_priv(dev);
1657 struct neighbour *n;
1658
1659 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1660 return false;
1661
1662 n = NULL;
1663 switch (ntohs(eth_hdr(skb)->h_proto)) {
1664 case ETH_P_IP:
1665 {
1666 struct iphdr *pip;
1667
1668 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1669 return false;
1670 pip = ip_hdr(skb);
1671 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1672 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1673 union vxlan_addr ipa = {
1674 .sin.sin_addr.s_addr = pip->daddr,
1675 .sin.sin_family = AF_INET,
1676 };
1677
1678 vxlan_ip_miss(dev, &ipa);
1679 return false;
1680 }
1681
1682 break;
1683 }
1684 #if IS_ENABLED(CONFIG_IPV6)
1685 case ETH_P_IPV6:
1686 {
1687 struct ipv6hdr *pip6;
1688
1689 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1690 return false;
1691 pip6 = ipv6_hdr(skb);
1692 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1693 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1694 union vxlan_addr ipa = {
1695 .sin6.sin6_addr = pip6->daddr,
1696 .sin6.sin6_family = AF_INET6,
1697 };
1698
1699 vxlan_ip_miss(dev, &ipa);
1700 return false;
1701 }
1702
1703 break;
1704 }
1705 #endif
1706 default:
1707 return false;
1708 }
1709
1710 if (n) {
1711 bool diff;
1712
1713 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1714 if (diff) {
1715 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1716 dev->addr_len);
1717 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1718 }
1719 neigh_release(n);
1720 return diff;
1721 }
1722
1723 return false;
1724 }
1725
1726 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1727 struct vxlan_metadata *md)
1728 {
1729 struct vxlanhdr_gbp *gbp;
1730
1731 if (!md->gbp)
1732 return;
1733
1734 gbp = (struct vxlanhdr_gbp *)vxh;
1735 vxh->vx_flags |= VXLAN_HF_GBP;
1736
1737 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1738 gbp->dont_learn = 1;
1739
1740 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1741 gbp->policy_applied = 1;
1742
1743 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1744 }
1745
1746 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1747 __be16 protocol)
1748 {
1749 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1750
1751 gpe->np_applied = 1;
1752
1753 switch (protocol) {
1754 case htons(ETH_P_IP):
1755 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1756 return 0;
1757 case htons(ETH_P_IPV6):
1758 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1759 return 0;
1760 case htons(ETH_P_TEB):
1761 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1762 return 0;
1763 }
1764 return -EPFNOSUPPORT;
1765 }
1766
1767 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1768 int iphdr_len, __be32 vni,
1769 struct vxlan_metadata *md, u32 vxflags,
1770 bool udp_sum)
1771 {
1772 struct vxlanhdr *vxh;
1773 int min_headroom;
1774 int err;
1775 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1776 __be16 inner_protocol = htons(ETH_P_TEB);
1777
1778 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1779 skb->ip_summed == CHECKSUM_PARTIAL) {
1780 int csum_start = skb_checksum_start_offset(skb);
1781
1782 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1783 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1784 (skb->csum_offset == offsetof(struct udphdr, check) ||
1785 skb->csum_offset == offsetof(struct tcphdr, check)))
1786 type |= SKB_GSO_TUNNEL_REMCSUM;
1787 }
1788
1789 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1790 + VXLAN_HLEN + iphdr_len
1791 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1792
1793 /* Need space for new headers (invalidates iph ptr) */
1794 err = skb_cow_head(skb, min_headroom);
1795 if (unlikely(err))
1796 goto out_free;
1797
1798 skb = vlan_hwaccel_push_inside(skb);
1799 if (WARN_ON(!skb))
1800 return -ENOMEM;
1801
1802 err = iptunnel_handle_offloads(skb, type);
1803 if (err)
1804 goto out_free;
1805
1806 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1807 vxh->vx_flags = VXLAN_HF_VNI;
1808 vxh->vx_vni = vxlan_vni_field(vni);
1809
1810 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1811 unsigned int start;
1812
1813 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1814 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1815 vxh->vx_flags |= VXLAN_HF_RCO;
1816
1817 if (!skb_is_gso(skb)) {
1818 skb->ip_summed = CHECKSUM_NONE;
1819 skb->encapsulation = 0;
1820 }
1821 }
1822
1823 if (vxflags & VXLAN_F_GBP)
1824 vxlan_build_gbp_hdr(vxh, vxflags, md);
1825 if (vxflags & VXLAN_F_GPE) {
1826 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1827 if (err < 0)
1828 goto out_free;
1829 inner_protocol = skb->protocol;
1830 }
1831
1832 skb_set_inner_protocol(skb, inner_protocol);
1833 return 0;
1834
1835 out_free:
1836 kfree_skb(skb);
1837 return err;
1838 }
1839
1840 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1841 struct sk_buff *skb, int oif, u8 tos,
1842 __be32 daddr, __be32 *saddr,
1843 struct dst_cache *dst_cache,
1844 const struct ip_tunnel_info *info)
1845 {
1846 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1847 struct rtable *rt = NULL;
1848 struct flowi4 fl4;
1849
1850 if (tos && !info)
1851 use_cache = false;
1852 if (use_cache) {
1853 rt = dst_cache_get_ip4(dst_cache, saddr);
1854 if (rt)
1855 return rt;
1856 }
1857
1858 memset(&fl4, 0, sizeof(fl4));
1859 fl4.flowi4_oif = oif;
1860 fl4.flowi4_tos = RT_TOS(tos);
1861 fl4.flowi4_mark = skb->mark;
1862 fl4.flowi4_proto = IPPROTO_UDP;
1863 fl4.daddr = daddr;
1864 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1865
1866 rt = ip_route_output_key(vxlan->net, &fl4);
1867 if (!IS_ERR(rt)) {
1868 *saddr = fl4.saddr;
1869 if (use_cache)
1870 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1871 }
1872 return rt;
1873 }
1874
1875 #if IS_ENABLED(CONFIG_IPV6)
1876 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1877 struct sk_buff *skb, int oif, u8 tos,
1878 __be32 label,
1879 const struct in6_addr *daddr,
1880 struct in6_addr *saddr,
1881 struct dst_cache *dst_cache,
1882 const struct ip_tunnel_info *info)
1883 {
1884 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1885 struct dst_entry *ndst;
1886 struct flowi6 fl6;
1887 int err;
1888
1889 if (tos && !info)
1890 use_cache = false;
1891 if (use_cache) {
1892 ndst = dst_cache_get_ip6(dst_cache, saddr);
1893 if (ndst)
1894 return ndst;
1895 }
1896
1897 memset(&fl6, 0, sizeof(fl6));
1898 fl6.flowi6_oif = oif;
1899 fl6.daddr = *daddr;
1900 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1901 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1902 fl6.flowi6_mark = skb->mark;
1903 fl6.flowi6_proto = IPPROTO_UDP;
1904
1905 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1906 vxlan->vn6_sock->sock->sk,
1907 &ndst, &fl6);
1908 if (err < 0)
1909 return ERR_PTR(err);
1910
1911 *saddr = fl6.saddr;
1912 if (use_cache)
1913 dst_cache_set_ip6(dst_cache, ndst, saddr);
1914 return ndst;
1915 }
1916 #endif
1917
1918 /* Bypass encapsulation if the destination is local */
1919 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1920 struct vxlan_dev *dst_vxlan)
1921 {
1922 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1923 union vxlan_addr loopback;
1924 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1925 struct net_device *dev = skb->dev;
1926 int len = skb->len;
1927
1928 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1929 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1930 skb->pkt_type = PACKET_HOST;
1931 skb->encapsulation = 0;
1932 skb->dev = dst_vxlan->dev;
1933 __skb_pull(skb, skb_network_offset(skb));
1934
1935 if (remote_ip->sa.sa_family == AF_INET) {
1936 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1937 loopback.sa.sa_family = AF_INET;
1938 #if IS_ENABLED(CONFIG_IPV6)
1939 } else {
1940 loopback.sin6.sin6_addr = in6addr_loopback;
1941 loopback.sa.sa_family = AF_INET6;
1942 #endif
1943 }
1944
1945 if (dst_vxlan->flags & VXLAN_F_LEARN)
1946 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1947
1948 u64_stats_update_begin(&tx_stats->syncp);
1949 tx_stats->tx_packets++;
1950 tx_stats->tx_bytes += len;
1951 u64_stats_update_end(&tx_stats->syncp);
1952
1953 if (netif_rx(skb) == NET_RX_SUCCESS) {
1954 u64_stats_update_begin(&rx_stats->syncp);
1955 rx_stats->rx_packets++;
1956 rx_stats->rx_bytes += len;
1957 u64_stats_update_end(&rx_stats->syncp);
1958 } else {
1959 dev->stats.rx_dropped++;
1960 }
1961 }
1962
1963 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1964 struct vxlan_rdst *rdst, bool did_rsc)
1965 {
1966 struct dst_cache *dst_cache;
1967 struct ip_tunnel_info *info;
1968 struct vxlan_dev *vxlan = netdev_priv(dev);
1969 struct sock *sk;
1970 struct rtable *rt = NULL;
1971 const struct iphdr *old_iph;
1972 union vxlan_addr *dst;
1973 union vxlan_addr remote_ip;
1974 struct vxlan_metadata _md;
1975 struct vxlan_metadata *md = &_md;
1976 __be16 src_port = 0, dst_port;
1977 __be32 vni, label;
1978 __be16 df = 0;
1979 __u8 tos, ttl;
1980 int err;
1981 u32 flags = vxlan->flags;
1982 bool udp_sum = false;
1983 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1984
1985 info = skb_tunnel_info(skb);
1986
1987 if (rdst) {
1988 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1989 vni = rdst->remote_vni;
1990 dst = &rdst->remote_ip;
1991 dst_cache = &rdst->dst_cache;
1992 } else {
1993 if (!info) {
1994 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1995 dev->name);
1996 goto drop;
1997 }
1998 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1999 vni = vxlan_tun_id_to_vni(info->key.tun_id);
2000 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2001 if (remote_ip.sa.sa_family == AF_INET)
2002 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2003 else
2004 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2005 dst = &remote_ip;
2006 dst_cache = &info->dst_cache;
2007 }
2008
2009 if (vxlan_addr_any(dst)) {
2010 if (did_rsc) {
2011 /* short-circuited back to local bridge */
2012 vxlan_encap_bypass(skb, vxlan, vxlan);
2013 return;
2014 }
2015 goto drop;
2016 }
2017
2018 old_iph = ip_hdr(skb);
2019
2020 ttl = vxlan->cfg.ttl;
2021 if (!ttl && vxlan_addr_multicast(dst))
2022 ttl = 1;
2023
2024 tos = vxlan->cfg.tos;
2025 if (tos == 1)
2026 tos = ip_tunnel_get_dsfield(old_iph, skb);
2027
2028 label = vxlan->cfg.label;
2029 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2030 vxlan->cfg.port_max, true);
2031
2032 if (info) {
2033 ttl = info->key.ttl;
2034 tos = info->key.tos;
2035 label = info->key.label;
2036 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2037
2038 if (info->options_len)
2039 md = ip_tunnel_info_opts(info);
2040 } else {
2041 md->gbp = skb->mark;
2042 }
2043
2044 if (dst->sa.sa_family == AF_INET) {
2045 __be32 saddr;
2046
2047 if (!vxlan->vn4_sock)
2048 goto drop;
2049 sk = vxlan->vn4_sock->sock->sk;
2050
2051 rt = vxlan_get_route(vxlan, skb,
2052 rdst ? rdst->remote_ifindex : 0, tos,
2053 dst->sin.sin_addr.s_addr, &saddr,
2054 dst_cache, info);
2055 if (IS_ERR(rt)) {
2056 netdev_dbg(dev, "no route to %pI4\n",
2057 &dst->sin.sin_addr.s_addr);
2058 dev->stats.tx_carrier_errors++;
2059 goto tx_error;
2060 }
2061
2062 if (rt->dst.dev == dev) {
2063 netdev_dbg(dev, "circular route to %pI4\n",
2064 &dst->sin.sin_addr.s_addr);
2065 dev->stats.collisions++;
2066 goto rt_tx_error;
2067 }
2068
2069 /* Bypass encapsulation if the destination is local */
2070 if (rt->rt_flags & RTCF_LOCAL &&
2071 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2072 struct vxlan_dev *dst_vxlan;
2073
2074 ip_rt_put(rt);
2075 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2076 dst->sa.sa_family, dst_port,
2077 vxlan->flags);
2078 if (!dst_vxlan)
2079 goto tx_error;
2080 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2081 return;
2082 }
2083
2084 if (!info)
2085 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2086 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2087 df = htons(IP_DF);
2088
2089 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2090 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2091 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2092 vni, md, flags, udp_sum);
2093 if (err < 0)
2094 goto xmit_tx_error;
2095
2096 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2097 dst->sin.sin_addr.s_addr, tos, ttl, df,
2098 src_port, dst_port, xnet, !udp_sum);
2099 #if IS_ENABLED(CONFIG_IPV6)
2100 } else {
2101 struct dst_entry *ndst;
2102 struct in6_addr saddr;
2103 u32 rt6i_flags;
2104
2105 if (!vxlan->vn6_sock)
2106 goto drop;
2107 sk = vxlan->vn6_sock->sock->sk;
2108
2109 ndst = vxlan6_get_route(vxlan, skb,
2110 rdst ? rdst->remote_ifindex : 0, tos,
2111 label, &dst->sin6.sin6_addr, &saddr,
2112 dst_cache, info);
2113 if (IS_ERR(ndst)) {
2114 netdev_dbg(dev, "no route to %pI6\n",
2115 &dst->sin6.sin6_addr);
2116 dev->stats.tx_carrier_errors++;
2117 goto tx_error;
2118 }
2119
2120 if (ndst->dev == dev) {
2121 netdev_dbg(dev, "circular route to %pI6\n",
2122 &dst->sin6.sin6_addr);
2123 dst_release(ndst);
2124 dev->stats.collisions++;
2125 goto tx_error;
2126 }
2127
2128 /* Bypass encapsulation if the destination is local */
2129 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2130 if (rt6i_flags & RTF_LOCAL &&
2131 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2132 struct vxlan_dev *dst_vxlan;
2133
2134 dst_release(ndst);
2135 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2136 dst->sa.sa_family, dst_port,
2137 vxlan->flags);
2138 if (!dst_vxlan)
2139 goto tx_error;
2140 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2141 return;
2142 }
2143
2144 if (!info)
2145 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2146
2147 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2148 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2149 skb_scrub_packet(skb, xnet);
2150 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2151 vni, md, flags, udp_sum);
2152 if (err < 0) {
2153 dst_release(ndst);
2154 return;
2155 }
2156 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2157 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2158 label, src_port, dst_port, !udp_sum);
2159 #endif
2160 }
2161
2162 return;
2163
2164 drop:
2165 dev->stats.tx_dropped++;
2166 goto tx_free;
2167
2168 xmit_tx_error:
2169 /* skb is already freed. */
2170 skb = NULL;
2171 rt_tx_error:
2172 ip_rt_put(rt);
2173 tx_error:
2174 dev->stats.tx_errors++;
2175 tx_free:
2176 dev_kfree_skb(skb);
2177 }
2178
2179 /* Transmit local packets over Vxlan
2180 *
2181 * Outer IP header inherits ECN and DF from inner header.
2182 * Outer UDP destination is the VXLAN assigned port.
2183 * source port is based on hash of flow
2184 */
2185 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2186 {
2187 struct vxlan_dev *vxlan = netdev_priv(dev);
2188 const struct ip_tunnel_info *info;
2189 struct ethhdr *eth;
2190 bool did_rsc = false;
2191 struct vxlan_rdst *rdst, *fdst = NULL;
2192 struct vxlan_fdb *f;
2193
2194 info = skb_tunnel_info(skb);
2195
2196 skb_reset_mac_header(skb);
2197
2198 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2199 if (info && info->mode & IP_TUNNEL_INFO_TX)
2200 vxlan_xmit_one(skb, dev, NULL, false);
2201 else
2202 kfree_skb(skb);
2203 return NETDEV_TX_OK;
2204 }
2205
2206 if (vxlan->flags & VXLAN_F_PROXY) {
2207 eth = eth_hdr(skb);
2208 if (ntohs(eth->h_proto) == ETH_P_ARP)
2209 return arp_reduce(dev, skb);
2210 #if IS_ENABLED(CONFIG_IPV6)
2211 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2212 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2213 + sizeof(struct nd_msg)) &&
2214 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2215 struct nd_msg *msg;
2216
2217 msg = (struct nd_msg *)skb_transport_header(skb);
2218 if (msg->icmph.icmp6_code == 0 &&
2219 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2220 return neigh_reduce(dev, skb);
2221 }
2222 #endif
2223 }
2224
2225 eth = eth_hdr(skb);
2226 f = vxlan_find_mac(vxlan, eth->h_dest);
2227 did_rsc = false;
2228
2229 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2230 (ntohs(eth->h_proto) == ETH_P_IP ||
2231 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2232 did_rsc = route_shortcircuit(dev, skb);
2233 if (did_rsc)
2234 f = vxlan_find_mac(vxlan, eth->h_dest);
2235 }
2236
2237 if (f == NULL) {
2238 f = vxlan_find_mac(vxlan, all_zeros_mac);
2239 if (f == NULL) {
2240 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2241 !is_multicast_ether_addr(eth->h_dest))
2242 vxlan_fdb_miss(vxlan, eth->h_dest);
2243
2244 dev->stats.tx_dropped++;
2245 kfree_skb(skb);
2246 return NETDEV_TX_OK;
2247 }
2248 }
2249
2250 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2251 struct sk_buff *skb1;
2252
2253 if (!fdst) {
2254 fdst = rdst;
2255 continue;
2256 }
2257 skb1 = skb_clone(skb, GFP_ATOMIC);
2258 if (skb1)
2259 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2260 }
2261
2262 if (fdst)
2263 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2264 else
2265 kfree_skb(skb);
2266 return NETDEV_TX_OK;
2267 }
2268
2269 /* Walk the forwarding table and purge stale entries */
2270 static void vxlan_cleanup(unsigned long arg)
2271 {
2272 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2273 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2274 unsigned int h;
2275
2276 if (!netif_running(vxlan->dev))
2277 return;
2278
2279 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2280 struct hlist_node *p, *n;
2281
2282 spin_lock_bh(&vxlan->hash_lock);
2283 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2284 struct vxlan_fdb *f
2285 = container_of(p, struct vxlan_fdb, hlist);
2286 unsigned long timeout;
2287
2288 if (f->state & NUD_PERMANENT)
2289 continue;
2290
2291 timeout = f->used + vxlan->cfg.age_interval * HZ;
2292 if (time_before_eq(timeout, jiffies)) {
2293 netdev_dbg(vxlan->dev,
2294 "garbage collect %pM\n",
2295 f->eth_addr);
2296 f->state = NUD_STALE;
2297 vxlan_fdb_destroy(vxlan, f);
2298 } else if (time_before(timeout, next_timer))
2299 next_timer = timeout;
2300 }
2301 spin_unlock_bh(&vxlan->hash_lock);
2302 }
2303
2304 mod_timer(&vxlan->age_timer, next_timer);
2305 }
2306
2307 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2308 {
2309 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2310 __be32 vni = vxlan->default_dst.remote_vni;
2311
2312 spin_lock(&vn->sock_lock);
2313 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2314 spin_unlock(&vn->sock_lock);
2315 }
2316
2317 /* Setup stats when device is created */
2318 static int vxlan_init(struct net_device *dev)
2319 {
2320 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2321 if (!dev->tstats)
2322 return -ENOMEM;
2323
2324 return 0;
2325 }
2326
2327 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2328 {
2329 struct vxlan_fdb *f;
2330
2331 spin_lock_bh(&vxlan->hash_lock);
2332 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2333 if (f)
2334 vxlan_fdb_destroy(vxlan, f);
2335 spin_unlock_bh(&vxlan->hash_lock);
2336 }
2337
2338 static void vxlan_uninit(struct net_device *dev)
2339 {
2340 struct vxlan_dev *vxlan = netdev_priv(dev);
2341
2342 vxlan_fdb_delete_default(vxlan);
2343
2344 free_percpu(dev->tstats);
2345 }
2346
2347 /* Start ageing timer and join group when device is brought up */
2348 static int vxlan_open(struct net_device *dev)
2349 {
2350 struct vxlan_dev *vxlan = netdev_priv(dev);
2351 int ret;
2352
2353 ret = vxlan_sock_add(vxlan);
2354 if (ret < 0)
2355 return ret;
2356
2357 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2358 ret = vxlan_igmp_join(vxlan);
2359 if (ret == -EADDRINUSE)
2360 ret = 0;
2361 if (ret) {
2362 vxlan_sock_release(vxlan);
2363 return ret;
2364 }
2365 }
2366
2367 if (vxlan->cfg.age_interval)
2368 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2369
2370 return ret;
2371 }
2372
2373 /* Purge the forwarding table */
2374 static void vxlan_flush(struct vxlan_dev *vxlan)
2375 {
2376 unsigned int h;
2377
2378 spin_lock_bh(&vxlan->hash_lock);
2379 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2380 struct hlist_node *p, *n;
2381 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2382 struct vxlan_fdb *f
2383 = container_of(p, struct vxlan_fdb, hlist);
2384 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2385 if (!is_zero_ether_addr(f->eth_addr))
2386 vxlan_fdb_destroy(vxlan, f);
2387 }
2388 }
2389 spin_unlock_bh(&vxlan->hash_lock);
2390 }
2391
2392 /* Cleanup timer and forwarding table on shutdown */
2393 static int vxlan_stop(struct net_device *dev)
2394 {
2395 struct vxlan_dev *vxlan = netdev_priv(dev);
2396 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2397 int ret = 0;
2398
2399 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2400 !vxlan_group_used(vn, vxlan))
2401 ret = vxlan_igmp_leave(vxlan);
2402
2403 del_timer_sync(&vxlan->age_timer);
2404
2405 vxlan_flush(vxlan);
2406 vxlan_sock_release(vxlan);
2407
2408 return ret;
2409 }
2410
2411 /* Stub, nothing needs to be done. */
2412 static void vxlan_set_multicast_list(struct net_device *dev)
2413 {
2414 }
2415
2416 static int __vxlan_change_mtu(struct net_device *dev,
2417 struct net_device *lowerdev,
2418 struct vxlan_rdst *dst, int new_mtu, bool strict)
2419 {
2420 int max_mtu = IP_MAX_MTU;
2421
2422 if (lowerdev)
2423 max_mtu = lowerdev->mtu;
2424
2425 if (dst->remote_ip.sa.sa_family == AF_INET6)
2426 max_mtu -= VXLAN6_HEADROOM;
2427 else
2428 max_mtu -= VXLAN_HEADROOM;
2429
2430 if (new_mtu < 68)
2431 return -EINVAL;
2432
2433 if (new_mtu > max_mtu) {
2434 if (strict)
2435 return -EINVAL;
2436
2437 new_mtu = max_mtu;
2438 }
2439
2440 dev->mtu = new_mtu;
2441 return 0;
2442 }
2443
2444 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2445 {
2446 struct vxlan_dev *vxlan = netdev_priv(dev);
2447 struct vxlan_rdst *dst = &vxlan->default_dst;
2448 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2449 dst->remote_ifindex);
2450 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2451 }
2452
2453 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2454 {
2455 struct vxlan_dev *vxlan = netdev_priv(dev);
2456 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2457 __be16 sport, dport;
2458
2459 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2460 vxlan->cfg.port_max, true);
2461 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2462
2463 if (ip_tunnel_info_af(info) == AF_INET) {
2464 struct rtable *rt;
2465
2466 if (!vxlan->vn4_sock)
2467 return -EINVAL;
2468 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2469 info->key.u.ipv4.dst,
2470 &info->key.u.ipv4.src, NULL, info);
2471 if (IS_ERR(rt))
2472 return PTR_ERR(rt);
2473 ip_rt_put(rt);
2474 } else {
2475 #if IS_ENABLED(CONFIG_IPV6)
2476 struct dst_entry *ndst;
2477
2478 if (!vxlan->vn6_sock)
2479 return -EINVAL;
2480 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2481 info->key.label, &info->key.u.ipv6.dst,
2482 &info->key.u.ipv6.src, NULL, info);
2483 if (IS_ERR(ndst))
2484 return PTR_ERR(ndst);
2485 dst_release(ndst);
2486 #else /* !CONFIG_IPV6 */
2487 return -EPFNOSUPPORT;
2488 #endif
2489 }
2490 info->key.tp_src = sport;
2491 info->key.tp_dst = dport;
2492 return 0;
2493 }
2494
2495 static const struct net_device_ops vxlan_netdev_ether_ops = {
2496 .ndo_init = vxlan_init,
2497 .ndo_uninit = vxlan_uninit,
2498 .ndo_open = vxlan_open,
2499 .ndo_stop = vxlan_stop,
2500 .ndo_start_xmit = vxlan_xmit,
2501 .ndo_get_stats64 = ip_tunnel_get_stats64,
2502 .ndo_set_rx_mode = vxlan_set_multicast_list,
2503 .ndo_change_mtu = vxlan_change_mtu,
2504 .ndo_validate_addr = eth_validate_addr,
2505 .ndo_set_mac_address = eth_mac_addr,
2506 .ndo_fdb_add = vxlan_fdb_add,
2507 .ndo_fdb_del = vxlan_fdb_delete,
2508 .ndo_fdb_dump = vxlan_fdb_dump,
2509 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2510 };
2511
2512 static const struct net_device_ops vxlan_netdev_raw_ops = {
2513 .ndo_init = vxlan_init,
2514 .ndo_uninit = vxlan_uninit,
2515 .ndo_open = vxlan_open,
2516 .ndo_stop = vxlan_stop,
2517 .ndo_start_xmit = vxlan_xmit,
2518 .ndo_get_stats64 = ip_tunnel_get_stats64,
2519 .ndo_change_mtu = vxlan_change_mtu,
2520 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2521 };
2522
2523 /* Info for udev, that this is a virtual tunnel endpoint */
2524 static struct device_type vxlan_type = {
2525 .name = "vxlan",
2526 };
2527
2528 /* Calls the ndo_add_vxlan_port of the caller in order to
2529 * supply the listening VXLAN udp ports. Callers are expected
2530 * to implement the ndo_add_vxlan_port.
2531 */
2532 static void vxlan_push_rx_ports(struct net_device *dev)
2533 {
2534 struct vxlan_sock *vs;
2535 struct net *net = dev_net(dev);
2536 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2537 sa_family_t sa_family;
2538 __be16 port;
2539 unsigned int i;
2540
2541 if (!dev->netdev_ops->ndo_add_vxlan_port)
2542 return;
2543
2544 spin_lock(&vn->sock_lock);
2545 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2546 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2547 port = inet_sk(vs->sock->sk)->inet_sport;
2548 sa_family = vxlan_get_sk_family(vs);
2549 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2550 port);
2551 }
2552 }
2553 spin_unlock(&vn->sock_lock);
2554 }
2555
2556 /* Initialize the device structure. */
2557 static void vxlan_setup(struct net_device *dev)
2558 {
2559 struct vxlan_dev *vxlan = netdev_priv(dev);
2560 unsigned int h;
2561
2562 eth_hw_addr_random(dev);
2563 ether_setup(dev);
2564
2565 dev->destructor = free_netdev;
2566 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2567
2568 dev->features |= NETIF_F_LLTX;
2569 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2570 dev->features |= NETIF_F_RXCSUM;
2571 dev->features |= NETIF_F_GSO_SOFTWARE;
2572
2573 dev->vlan_features = dev->features;
2574 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2575 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2576 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2577 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2578 netif_keep_dst(dev);
2579 dev->priv_flags |= IFF_NO_QUEUE;
2580
2581 INIT_LIST_HEAD(&vxlan->next);
2582 spin_lock_init(&vxlan->hash_lock);
2583
2584 init_timer_deferrable(&vxlan->age_timer);
2585 vxlan->age_timer.function = vxlan_cleanup;
2586 vxlan->age_timer.data = (unsigned long) vxlan;
2587
2588 vxlan->cfg.dst_port = htons(vxlan_port);
2589
2590 vxlan->dev = dev;
2591
2592 gro_cells_init(&vxlan->gro_cells, dev);
2593
2594 for (h = 0; h < FDB_HASH_SIZE; ++h)
2595 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2596 }
2597
2598 static void vxlan_ether_setup(struct net_device *dev)
2599 {
2600 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2601 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2602 dev->netdev_ops = &vxlan_netdev_ether_ops;
2603 }
2604
2605 static void vxlan_raw_setup(struct net_device *dev)
2606 {
2607 dev->header_ops = NULL;
2608 dev->type = ARPHRD_NONE;
2609 dev->hard_header_len = 0;
2610 dev->addr_len = 0;
2611 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2612 dev->netdev_ops = &vxlan_netdev_raw_ops;
2613 }
2614
2615 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2616 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2617 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2618 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2619 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2620 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2621 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2622 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2623 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2624 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2625 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2626 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2627 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2628 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2629 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2630 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2631 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2632 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2633 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2634 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2635 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2636 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2637 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2638 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2639 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2640 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2641 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2642 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2643 };
2644
2645 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2646 {
2647 if (tb[IFLA_ADDRESS]) {
2648 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2649 pr_debug("invalid link address (not ethernet)\n");
2650 return -EINVAL;
2651 }
2652
2653 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2654 pr_debug("invalid all zero ethernet address\n");
2655 return -EADDRNOTAVAIL;
2656 }
2657 }
2658
2659 if (!data)
2660 return -EINVAL;
2661
2662 if (data[IFLA_VXLAN_ID]) {
2663 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2664 if (id >= VXLAN_VID_MASK)
2665 return -ERANGE;
2666 }
2667
2668 if (data[IFLA_VXLAN_PORT_RANGE]) {
2669 const struct ifla_vxlan_port_range *p
2670 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2671
2672 if (ntohs(p->high) < ntohs(p->low)) {
2673 pr_debug("port range %u .. %u not valid\n",
2674 ntohs(p->low), ntohs(p->high));
2675 return -EINVAL;
2676 }
2677 }
2678
2679 return 0;
2680 }
2681
2682 static void vxlan_get_drvinfo(struct net_device *netdev,
2683 struct ethtool_drvinfo *drvinfo)
2684 {
2685 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2686 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2687 }
2688
2689 static const struct ethtool_ops vxlan_ethtool_ops = {
2690 .get_drvinfo = vxlan_get_drvinfo,
2691 .get_link = ethtool_op_get_link,
2692 };
2693
2694 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2695 __be16 port, u32 flags)
2696 {
2697 struct socket *sock;
2698 struct udp_port_cfg udp_conf;
2699 int err;
2700
2701 memset(&udp_conf, 0, sizeof(udp_conf));
2702
2703 if (ipv6) {
2704 udp_conf.family = AF_INET6;
2705 udp_conf.use_udp6_rx_checksums =
2706 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2707 udp_conf.ipv6_v6only = 1;
2708 } else {
2709 udp_conf.family = AF_INET;
2710 }
2711
2712 udp_conf.local_udp_port = port;
2713
2714 /* Open UDP socket */
2715 err = udp_sock_create(net, &udp_conf, &sock);
2716 if (err < 0)
2717 return ERR_PTR(err);
2718
2719 return sock;
2720 }
2721
2722 /* Create new listen socket if needed */
2723 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2724 __be16 port, u32 flags)
2725 {
2726 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2727 struct vxlan_sock *vs;
2728 struct socket *sock;
2729 unsigned int h;
2730 struct udp_tunnel_sock_cfg tunnel_cfg;
2731
2732 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2733 if (!vs)
2734 return ERR_PTR(-ENOMEM);
2735
2736 for (h = 0; h < VNI_HASH_SIZE; ++h)
2737 INIT_HLIST_HEAD(&vs->vni_list[h]);
2738
2739 sock = vxlan_create_sock(net, ipv6, port, flags);
2740 if (IS_ERR(sock)) {
2741 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2742 PTR_ERR(sock));
2743 kfree(vs);
2744 return ERR_CAST(sock);
2745 }
2746
2747 vs->sock = sock;
2748 atomic_set(&vs->refcnt, 1);
2749 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2750
2751 spin_lock(&vn->sock_lock);
2752 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2753 vxlan_notify_add_rx_port(vs);
2754 spin_unlock(&vn->sock_lock);
2755
2756 /* Mark socket as an encapsulation socket. */
2757 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2758 tunnel_cfg.sk_user_data = vs;
2759 tunnel_cfg.encap_type = 1;
2760 tunnel_cfg.encap_rcv = vxlan_rcv;
2761 tunnel_cfg.encap_destroy = NULL;
2762 tunnel_cfg.gro_receive = vxlan_gro_receive;
2763 tunnel_cfg.gro_complete = vxlan_gro_complete;
2764
2765 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2766
2767 return vs;
2768 }
2769
2770 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2771 {
2772 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2773 struct vxlan_sock *vs = NULL;
2774
2775 if (!vxlan->cfg.no_share) {
2776 spin_lock(&vn->sock_lock);
2777 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2778 vxlan->cfg.dst_port, vxlan->flags);
2779 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2780 spin_unlock(&vn->sock_lock);
2781 return -EBUSY;
2782 }
2783 spin_unlock(&vn->sock_lock);
2784 }
2785 if (!vs)
2786 vs = vxlan_socket_create(vxlan->net, ipv6,
2787 vxlan->cfg.dst_port, vxlan->flags);
2788 if (IS_ERR(vs))
2789 return PTR_ERR(vs);
2790 #if IS_ENABLED(CONFIG_IPV6)
2791 if (ipv6)
2792 vxlan->vn6_sock = vs;
2793 else
2794 #endif
2795 vxlan->vn4_sock = vs;
2796 vxlan_vs_add_dev(vs, vxlan);
2797 return 0;
2798 }
2799
2800 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2801 {
2802 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2803 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2804 int ret = 0;
2805
2806 vxlan->vn4_sock = NULL;
2807 #if IS_ENABLED(CONFIG_IPV6)
2808 vxlan->vn6_sock = NULL;
2809 if (ipv6 || metadata)
2810 ret = __vxlan_sock_add(vxlan, true);
2811 #endif
2812 if (!ret && (!ipv6 || metadata))
2813 ret = __vxlan_sock_add(vxlan, false);
2814 if (ret < 0)
2815 vxlan_sock_release(vxlan);
2816 return ret;
2817 }
2818
2819 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2820 struct vxlan_config *conf)
2821 {
2822 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2823 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2824 struct vxlan_rdst *dst = &vxlan->default_dst;
2825 unsigned short needed_headroom = ETH_HLEN;
2826 int err;
2827 bool use_ipv6 = false;
2828 __be16 default_port = vxlan->cfg.dst_port;
2829 struct net_device *lowerdev = NULL;
2830
2831 if (conf->flags & VXLAN_F_GPE) {
2832 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2833 return -EINVAL;
2834 /* For now, allow GPE only together with COLLECT_METADATA.
2835 * This can be relaxed later; in such case, the other side
2836 * of the PtP link will have to be provided.
2837 */
2838 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2839 return -EINVAL;
2840
2841 vxlan_raw_setup(dev);
2842 } else {
2843 vxlan_ether_setup(dev);
2844 }
2845
2846 vxlan->net = src_net;
2847
2848 dst->remote_vni = conf->vni;
2849
2850 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2851
2852 /* Unless IPv6 is explicitly requested, assume IPv4 */
2853 if (!dst->remote_ip.sa.sa_family)
2854 dst->remote_ip.sa.sa_family = AF_INET;
2855
2856 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2857 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2858 if (!IS_ENABLED(CONFIG_IPV6))
2859 return -EPFNOSUPPORT;
2860 use_ipv6 = true;
2861 vxlan->flags |= VXLAN_F_IPV6;
2862 }
2863
2864 if (conf->label && !use_ipv6) {
2865 pr_info("label only supported in use with IPv6\n");
2866 return -EINVAL;
2867 }
2868
2869 if (conf->remote_ifindex) {
2870 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2871 dst->remote_ifindex = conf->remote_ifindex;
2872
2873 if (!lowerdev) {
2874 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2875 return -ENODEV;
2876 }
2877
2878 #if IS_ENABLED(CONFIG_IPV6)
2879 if (use_ipv6) {
2880 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2881 if (idev && idev->cnf.disable_ipv6) {
2882 pr_info("IPv6 is disabled via sysctl\n");
2883 return -EPERM;
2884 }
2885 }
2886 #endif
2887
2888 if (!conf->mtu)
2889 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2890
2891 needed_headroom = lowerdev->hard_header_len;
2892 }
2893
2894 if (conf->mtu) {
2895 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2896 if (err)
2897 return err;
2898 }
2899
2900 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2901 needed_headroom += VXLAN6_HEADROOM;
2902 else
2903 needed_headroom += VXLAN_HEADROOM;
2904 dev->needed_headroom = needed_headroom;
2905
2906 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2907 if (!vxlan->cfg.dst_port) {
2908 if (conf->flags & VXLAN_F_GPE)
2909 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2910 else
2911 vxlan->cfg.dst_port = default_port;
2912 }
2913 vxlan->flags |= conf->flags;
2914
2915 if (!vxlan->cfg.age_interval)
2916 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2917
2918 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2919 if (tmp->cfg.vni == conf->vni &&
2920 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2921 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2922 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2923 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2924 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2925 return -EEXIST;
2926 }
2927
2928 dev->ethtool_ops = &vxlan_ethtool_ops;
2929
2930 /* create an fdb entry for a valid default destination */
2931 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2932 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2933 &vxlan->default_dst.remote_ip,
2934 NUD_REACHABLE|NUD_PERMANENT,
2935 NLM_F_EXCL|NLM_F_CREATE,
2936 vxlan->cfg.dst_port,
2937 vxlan->default_dst.remote_vni,
2938 vxlan->default_dst.remote_ifindex,
2939 NTF_SELF);
2940 if (err)
2941 return err;
2942 }
2943
2944 err = register_netdevice(dev);
2945 if (err) {
2946 vxlan_fdb_delete_default(vxlan);
2947 return err;
2948 }
2949
2950 list_add(&vxlan->next, &vn->vxlan_list);
2951
2952 return 0;
2953 }
2954
2955 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2956 struct nlattr *tb[], struct nlattr *data[])
2957 {
2958 struct vxlan_config conf;
2959 int err;
2960
2961 memset(&conf, 0, sizeof(conf));
2962
2963 if (data[IFLA_VXLAN_ID])
2964 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2965
2966 if (data[IFLA_VXLAN_GROUP]) {
2967 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2968 } else if (data[IFLA_VXLAN_GROUP6]) {
2969 if (!IS_ENABLED(CONFIG_IPV6))
2970 return -EPFNOSUPPORT;
2971
2972 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2973 conf.remote_ip.sa.sa_family = AF_INET6;
2974 }
2975
2976 if (data[IFLA_VXLAN_LOCAL]) {
2977 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2978 conf.saddr.sa.sa_family = AF_INET;
2979 } else if (data[IFLA_VXLAN_LOCAL6]) {
2980 if (!IS_ENABLED(CONFIG_IPV6))
2981 return -EPFNOSUPPORT;
2982
2983 /* TODO: respect scope id */
2984 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2985 conf.saddr.sa.sa_family = AF_INET6;
2986 }
2987
2988 if (data[IFLA_VXLAN_LINK])
2989 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2990
2991 if (data[IFLA_VXLAN_TOS])
2992 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2993
2994 if (data[IFLA_VXLAN_TTL])
2995 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2996
2997 if (data[IFLA_VXLAN_LABEL])
2998 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2999 IPV6_FLOWLABEL_MASK;
3000
3001 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3002 conf.flags |= VXLAN_F_LEARN;
3003
3004 if (data[IFLA_VXLAN_AGEING])
3005 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3006
3007 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
3008 conf.flags |= VXLAN_F_PROXY;
3009
3010 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
3011 conf.flags |= VXLAN_F_RSC;
3012
3013 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3014 conf.flags |= VXLAN_F_L2MISS;
3015
3016 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3017 conf.flags |= VXLAN_F_L3MISS;
3018
3019 if (data[IFLA_VXLAN_LIMIT])
3020 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3021
3022 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3023 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3024 conf.flags |= VXLAN_F_COLLECT_METADATA;
3025
3026 if (data[IFLA_VXLAN_PORT_RANGE]) {
3027 const struct ifla_vxlan_port_range *p
3028 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3029 conf.port_min = ntohs(p->low);
3030 conf.port_max = ntohs(p->high);
3031 }
3032
3033 if (data[IFLA_VXLAN_PORT])
3034 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3035
3036 if (data[IFLA_VXLAN_UDP_CSUM] &&
3037 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3038 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3039
3040 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3041 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3042 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3043
3044 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3045 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3046 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3047
3048 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3049 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3050 conf.flags |= VXLAN_F_REMCSUM_TX;
3051
3052 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3053 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3054 conf.flags |= VXLAN_F_REMCSUM_RX;
3055
3056 if (data[IFLA_VXLAN_GBP])
3057 conf.flags |= VXLAN_F_GBP;
3058
3059 if (data[IFLA_VXLAN_GPE])
3060 conf.flags |= VXLAN_F_GPE;
3061
3062 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3063 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3064
3065 if (tb[IFLA_MTU])
3066 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3067
3068 err = vxlan_dev_configure(src_net, dev, &conf);
3069 switch (err) {
3070 case -ENODEV:
3071 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3072 break;
3073
3074 case -EPERM:
3075 pr_info("IPv6 is disabled via sysctl\n");
3076 break;
3077
3078 case -EEXIST:
3079 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
3080 break;
3081
3082 case -EINVAL:
3083 pr_info("unsupported combination of extensions\n");
3084 break;
3085 }
3086
3087 return err;
3088 }
3089
3090 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3091 {
3092 struct vxlan_dev *vxlan = netdev_priv(dev);
3093 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3094
3095 spin_lock(&vn->sock_lock);
3096 if (!hlist_unhashed(&vxlan->hlist))
3097 hlist_del_rcu(&vxlan->hlist);
3098 spin_unlock(&vn->sock_lock);
3099
3100 gro_cells_destroy(&vxlan->gro_cells);
3101 list_del(&vxlan->next);
3102 unregister_netdevice_queue(dev, head);
3103 }
3104
3105 static size_t vxlan_get_size(const struct net_device *dev)
3106 {
3107
3108 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3109 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3110 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3111 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3112 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3113 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3114 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3115 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3116 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3117 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3118 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3119 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3120 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3121 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3122 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3123 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3124 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3125 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3126 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3127 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3128 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3129 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3130 0;
3131 }
3132
3133 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3134 {
3135 const struct vxlan_dev *vxlan = netdev_priv(dev);
3136 const struct vxlan_rdst *dst = &vxlan->default_dst;
3137 struct ifla_vxlan_port_range ports = {
3138 .low = htons(vxlan->cfg.port_min),
3139 .high = htons(vxlan->cfg.port_max),
3140 };
3141
3142 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3143 goto nla_put_failure;
3144
3145 if (!vxlan_addr_any(&dst->remote_ip)) {
3146 if (dst->remote_ip.sa.sa_family == AF_INET) {
3147 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3148 dst->remote_ip.sin.sin_addr.s_addr))
3149 goto nla_put_failure;
3150 #if IS_ENABLED(CONFIG_IPV6)
3151 } else {
3152 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3153 &dst->remote_ip.sin6.sin6_addr))
3154 goto nla_put_failure;
3155 #endif
3156 }
3157 }
3158
3159 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3160 goto nla_put_failure;
3161
3162 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3163 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3164 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3165 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3166 goto nla_put_failure;
3167 #if IS_ENABLED(CONFIG_IPV6)
3168 } else {
3169 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3170 &vxlan->cfg.saddr.sin6.sin6_addr))
3171 goto nla_put_failure;
3172 #endif
3173 }
3174 }
3175
3176 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3177 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3178 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3179 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3180 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3181 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3182 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3183 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3184 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3185 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3186 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3187 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3188 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3189 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3190 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3191 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3192 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3193 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3194 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3195 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3196 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3197 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3198 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3199 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3200 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3201 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3202 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3203 goto nla_put_failure;
3204
3205 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3206 goto nla_put_failure;
3207
3208 if (vxlan->flags & VXLAN_F_GBP &&
3209 nla_put_flag(skb, IFLA_VXLAN_GBP))
3210 goto nla_put_failure;
3211
3212 if (vxlan->flags & VXLAN_F_GPE &&
3213 nla_put_flag(skb, IFLA_VXLAN_GPE))
3214 goto nla_put_failure;
3215
3216 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3217 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3218 goto nla_put_failure;
3219
3220 return 0;
3221
3222 nla_put_failure:
3223 return -EMSGSIZE;
3224 }
3225
3226 static struct net *vxlan_get_link_net(const struct net_device *dev)
3227 {
3228 struct vxlan_dev *vxlan = netdev_priv(dev);
3229
3230 return vxlan->net;
3231 }
3232
3233 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3234 .kind = "vxlan",
3235 .maxtype = IFLA_VXLAN_MAX,
3236 .policy = vxlan_policy,
3237 .priv_size = sizeof(struct vxlan_dev),
3238 .setup = vxlan_setup,
3239 .validate = vxlan_validate,
3240 .newlink = vxlan_newlink,
3241 .dellink = vxlan_dellink,
3242 .get_size = vxlan_get_size,
3243 .fill_info = vxlan_fill_info,
3244 .get_link_net = vxlan_get_link_net,
3245 };
3246
3247 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3248 u8 name_assign_type,
3249 struct vxlan_config *conf)
3250 {
3251 struct nlattr *tb[IFLA_MAX + 1];
3252 struct net_device *dev;
3253 int err;
3254
3255 memset(&tb, 0, sizeof(tb));
3256
3257 dev = rtnl_create_link(net, name, name_assign_type,
3258 &vxlan_link_ops, tb);
3259 if (IS_ERR(dev))
3260 return dev;
3261
3262 err = vxlan_dev_configure(net, dev, conf);
3263 if (err < 0) {
3264 free_netdev(dev);
3265 return ERR_PTR(err);
3266 }
3267
3268 err = rtnl_configure_link(dev, NULL);
3269 if (err < 0) {
3270 LIST_HEAD(list_kill);
3271
3272 vxlan_dellink(dev, &list_kill);
3273 unregister_netdevice_many(&list_kill);
3274 return ERR_PTR(err);
3275 }
3276
3277 return dev;
3278 }
3279 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3280
3281 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3282 struct net_device *dev)
3283 {
3284 struct vxlan_dev *vxlan, *next;
3285 LIST_HEAD(list_kill);
3286
3287 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3288 struct vxlan_rdst *dst = &vxlan->default_dst;
3289
3290 /* In case we created vxlan device with carrier
3291 * and we loose the carrier due to module unload
3292 * we also need to remove vxlan device. In other
3293 * cases, it's not necessary and remote_ifindex
3294 * is 0 here, so no matches.
3295 */
3296 if (dst->remote_ifindex == dev->ifindex)
3297 vxlan_dellink(vxlan->dev, &list_kill);
3298 }
3299
3300 unregister_netdevice_many(&list_kill);
3301 }
3302
3303 static int vxlan_netdevice_event(struct notifier_block *unused,
3304 unsigned long event, void *ptr)
3305 {
3306 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3307 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3308
3309 if (event == NETDEV_UNREGISTER)
3310 vxlan_handle_lowerdev_unregister(vn, dev);
3311 else if (event == NETDEV_OFFLOAD_PUSH_VXLAN)
3312 vxlan_push_rx_ports(dev);
3313
3314 return NOTIFY_DONE;
3315 }
3316
3317 static struct notifier_block vxlan_notifier_block __read_mostly = {
3318 .notifier_call = vxlan_netdevice_event,
3319 };
3320
3321 static __net_init int vxlan_init_net(struct net *net)
3322 {
3323 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3324 unsigned int h;
3325
3326 INIT_LIST_HEAD(&vn->vxlan_list);
3327 spin_lock_init(&vn->sock_lock);
3328
3329 for (h = 0; h < PORT_HASH_SIZE; ++h)
3330 INIT_HLIST_HEAD(&vn->sock_list[h]);
3331
3332 return 0;
3333 }
3334
3335 static void __net_exit vxlan_exit_net(struct net *net)
3336 {
3337 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3338 struct vxlan_dev *vxlan, *next;
3339 struct net_device *dev, *aux;
3340 LIST_HEAD(list);
3341
3342 rtnl_lock();
3343 for_each_netdev_safe(net, dev, aux)
3344 if (dev->rtnl_link_ops == &vxlan_link_ops)
3345 unregister_netdevice_queue(dev, &list);
3346
3347 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3348 /* If vxlan->dev is in the same netns, it has already been added
3349 * to the list by the previous loop.
3350 */
3351 if (!net_eq(dev_net(vxlan->dev), net)) {
3352 gro_cells_destroy(&vxlan->gro_cells);
3353 unregister_netdevice_queue(vxlan->dev, &list);
3354 }
3355 }
3356
3357 unregister_netdevice_many(&list);
3358 rtnl_unlock();
3359 }
3360
3361 static struct pernet_operations vxlan_net_ops = {
3362 .init = vxlan_init_net,
3363 .exit = vxlan_exit_net,
3364 .id = &vxlan_net_id,
3365 .size = sizeof(struct vxlan_net),
3366 };
3367
3368 static int __init vxlan_init_module(void)
3369 {
3370 int rc;
3371
3372 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3373
3374 rc = register_pernet_subsys(&vxlan_net_ops);
3375 if (rc)
3376 goto out1;
3377
3378 rc = register_netdevice_notifier(&vxlan_notifier_block);
3379 if (rc)
3380 goto out2;
3381
3382 rc = rtnl_link_register(&vxlan_link_ops);
3383 if (rc)
3384 goto out3;
3385
3386 return 0;
3387 out3:
3388 unregister_netdevice_notifier(&vxlan_notifier_block);
3389 out2:
3390 unregister_pernet_subsys(&vxlan_net_ops);
3391 out1:
3392 return rc;
3393 }
3394 late_initcall(vxlan_init_module);
3395
3396 static void __exit vxlan_cleanup_module(void)
3397 {
3398 rtnl_link_unregister(&vxlan_link_ops);
3399 unregister_netdevice_notifier(&vxlan_notifier_block);
3400 unregister_pernet_subsys(&vxlan_net_ops);
3401 /* rcu_barrier() is called by netns */
3402 }
3403 module_exit(vxlan_cleanup_module);
3404
3405 MODULE_LICENSE("GPL");
3406 MODULE_VERSION(VXLAN_VERSION);
3407 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3408 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3409 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support