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Merge tag 'gpio-v4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
47 #include <net/ipv6.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
51 #endif
52 #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];
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 static struct workqueue_struct *vxlan_wq;
102
103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104 {
105 return vs->flags & VXLAN_F_COLLECT_METADATA ||
106 ip_tunnel_collect_metadata();
107 }
108
109 #if IS_ENABLED(CONFIG_IPV6)
110 static inline
111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112 {
113 if (a->sa.sa_family != b->sa.sa_family)
114 return false;
115 if (a->sa.sa_family == AF_INET6)
116 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117 else
118 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
119 }
120
121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122 {
123 if (ipa->sa.sa_family == AF_INET6)
124 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125 else
126 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
127 }
128
129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130 {
131 if (ipa->sa.sa_family == AF_INET6)
132 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133 else
134 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
135 }
136
137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138 {
139 if (nla_len(nla) >= sizeof(struct in6_addr)) {
140 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141 ip->sa.sa_family = AF_INET6;
142 return 0;
143 } else if (nla_len(nla) >= sizeof(__be32)) {
144 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145 ip->sa.sa_family = AF_INET;
146 return 0;
147 } else {
148 return -EAFNOSUPPORT;
149 }
150 }
151
152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153 const union vxlan_addr *ip)
154 {
155 if (ip->sa.sa_family == AF_INET6)
156 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
157 else
158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
159 }
160
161 #else /* !CONFIG_IPV6 */
162
163 static inline
164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165 {
166 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
167 }
168
169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170 {
171 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
172 }
173
174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175 {
176 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
177 }
178
179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180 {
181 if (nla_len(nla) >= sizeof(struct in6_addr)) {
182 return -EAFNOSUPPORT;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
185 ip->sa.sa_family = AF_INET;
186 return 0;
187 } else {
188 return -EAFNOSUPPORT;
189 }
190 }
191
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193 const union vxlan_addr *ip)
194 {
195 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
196 }
197 #endif
198
199 /* Virtual Network hash table head */
200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
201 {
202 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
203 }
204
205 /* Socket hash table head */
206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
207 {
208 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209
210 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
211 }
212
213 /* First remote destination for a forwarding entry.
214 * Guaranteed to be non-NULL because remotes are never deleted.
215 */
216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
217 {
218 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
219 }
220
221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222 {
223 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
224 }
225
226 /* Find VXLAN socket based on network namespace, address family and UDP port
227 * and enabled unshareable flags.
228 */
229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230 __be16 port, u32 flags)
231 {
232 struct vxlan_sock *vs;
233
234 flags &= VXLAN_F_RCV_FLAGS;
235
236 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238 vxlan_get_sk_family(vs) == family &&
239 vs->flags == flags)
240 return vs;
241 }
242 return NULL;
243 }
244
245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
246 {
247 struct vxlan_dev *vxlan;
248
249 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
250 if (vxlan->default_dst.remote_vni == id)
251 return vxlan;
252 }
253
254 return NULL;
255 }
256
257 /* Look up VNI in a per net namespace table */
258 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
259 sa_family_t family, __be16 port,
260 u32 flags)
261 {
262 struct vxlan_sock *vs;
263
264 vs = vxlan_find_sock(net, family, port, flags);
265 if (!vs)
266 return NULL;
267
268 return vxlan_vs_find_vni(vs, id);
269 }
270
271 /* Fill in neighbour message in skbuff. */
272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
273 const struct vxlan_fdb *fdb,
274 u32 portid, u32 seq, int type, unsigned int flags,
275 const struct vxlan_rdst *rdst)
276 {
277 unsigned long now = jiffies;
278 struct nda_cacheinfo ci;
279 struct nlmsghdr *nlh;
280 struct ndmsg *ndm;
281 bool send_ip, send_eth;
282
283 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
284 if (nlh == NULL)
285 return -EMSGSIZE;
286
287 ndm = nlmsg_data(nlh);
288 memset(ndm, 0, sizeof(*ndm));
289
290 send_eth = send_ip = true;
291
292 if (type == RTM_GETNEIGH) {
293 ndm->ndm_family = AF_INET;
294 send_ip = !vxlan_addr_any(&rdst->remote_ip);
295 send_eth = !is_zero_ether_addr(fdb->eth_addr);
296 } else
297 ndm->ndm_family = AF_BRIDGE;
298 ndm->ndm_state = fdb->state;
299 ndm->ndm_ifindex = vxlan->dev->ifindex;
300 ndm->ndm_flags = fdb->flags;
301 ndm->ndm_type = RTN_UNICAST;
302
303 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304 nla_put_s32(skb, NDA_LINK_NETNSID,
305 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
306 goto nla_put_failure;
307
308 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309 goto nla_put_failure;
310
311 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
312 goto nla_put_failure;
313
314 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
315 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
316 goto nla_put_failure;
317 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
318 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
319 goto nla_put_failure;
320 if (rdst->remote_ifindex &&
321 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
322 goto nla_put_failure;
323
324 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
325 ci.ndm_confirmed = 0;
326 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
327 ci.ndm_refcnt = 0;
328
329 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
330 goto nla_put_failure;
331
332 nlmsg_end(skb, nlh);
333 return 0;
334
335 nla_put_failure:
336 nlmsg_cancel(skb, nlh);
337 return -EMSGSIZE;
338 }
339
340 static inline size_t vxlan_nlmsg_size(void)
341 {
342 return NLMSG_ALIGN(sizeof(struct ndmsg))
343 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
344 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
345 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
346 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
347 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
348 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
349 + nla_total_size(sizeof(struct nda_cacheinfo));
350 }
351
352 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
353 struct vxlan_rdst *rd, int type)
354 {
355 struct net *net = dev_net(vxlan->dev);
356 struct sk_buff *skb;
357 int err = -ENOBUFS;
358
359 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
360 if (skb == NULL)
361 goto errout;
362
363 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
364 if (err < 0) {
365 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
366 WARN_ON(err == -EMSGSIZE);
367 kfree_skb(skb);
368 goto errout;
369 }
370
371 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
372 return;
373 errout:
374 if (err < 0)
375 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
376 }
377
378 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
379 {
380 struct vxlan_dev *vxlan = netdev_priv(dev);
381 struct vxlan_fdb f = {
382 .state = NUD_STALE,
383 };
384 struct vxlan_rdst remote = {
385 .remote_ip = *ipa, /* goes to NDA_DST */
386 .remote_vni = VXLAN_N_VID,
387 };
388
389 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
390 }
391
392 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
393 {
394 struct vxlan_fdb f = {
395 .state = NUD_STALE,
396 };
397 struct vxlan_rdst remote = { };
398
399 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
400
401 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
402 }
403
404 /* Hash Ethernet address */
405 static u32 eth_hash(const unsigned char *addr)
406 {
407 u64 value = get_unaligned((u64 *)addr);
408
409 /* only want 6 bytes */
410 #ifdef __BIG_ENDIAN
411 value >>= 16;
412 #else
413 value <<= 16;
414 #endif
415 return hash_64(value, FDB_HASH_BITS);
416 }
417
418 /* Hash chain to use given mac address */
419 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
420 const u8 *mac)
421 {
422 return &vxlan->fdb_head[eth_hash(mac)];
423 }
424
425 /* Look up Ethernet address in forwarding table */
426 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
427 const u8 *mac)
428 {
429 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
430 struct vxlan_fdb *f;
431
432 hlist_for_each_entry_rcu(f, head, hlist) {
433 if (ether_addr_equal(mac, f->eth_addr))
434 return f;
435 }
436
437 return NULL;
438 }
439
440 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
441 const u8 *mac)
442 {
443 struct vxlan_fdb *f;
444
445 f = __vxlan_find_mac(vxlan, mac);
446 if (f)
447 f->used = jiffies;
448
449 return f;
450 }
451
452 /* caller should hold vxlan->hash_lock */
453 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
454 union vxlan_addr *ip, __be16 port,
455 __u32 vni, __u32 ifindex)
456 {
457 struct vxlan_rdst *rd;
458
459 list_for_each_entry(rd, &f->remotes, list) {
460 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
461 rd->remote_port == port &&
462 rd->remote_vni == vni &&
463 rd->remote_ifindex == ifindex)
464 return rd;
465 }
466
467 return NULL;
468 }
469
470 /* Replace destination of unicast mac */
471 static int vxlan_fdb_replace(struct vxlan_fdb *f,
472 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
473 {
474 struct vxlan_rdst *rd;
475
476 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
477 if (rd)
478 return 0;
479
480 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
481 if (!rd)
482 return 0;
483 rd->remote_ip = *ip;
484 rd->remote_port = port;
485 rd->remote_vni = vni;
486 rd->remote_ifindex = ifindex;
487 return 1;
488 }
489
490 /* Add/update destinations for multicast */
491 static int vxlan_fdb_append(struct vxlan_fdb *f,
492 union vxlan_addr *ip, __be16 port, __u32 vni,
493 __u32 ifindex, struct vxlan_rdst **rdp)
494 {
495 struct vxlan_rdst *rd;
496
497 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
498 if (rd)
499 return 0;
500
501 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
502 if (rd == NULL)
503 return -ENOBUFS;
504 rd->remote_ip = *ip;
505 rd->remote_port = port;
506 rd->remote_vni = vni;
507 rd->remote_ifindex = ifindex;
508
509 list_add_tail_rcu(&rd->list, &f->remotes);
510
511 *rdp = rd;
512 return 1;
513 }
514
515 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
516 unsigned int off,
517 struct vxlanhdr *vh, size_t hdrlen,
518 u32 data, struct gro_remcsum *grc,
519 bool nopartial)
520 {
521 size_t start, offset;
522
523 if (skb->remcsum_offload)
524 return vh;
525
526 if (!NAPI_GRO_CB(skb)->csum_valid)
527 return NULL;
528
529 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
530 offset = start + ((data & VXLAN_RCO_UDP) ?
531 offsetof(struct udphdr, check) :
532 offsetof(struct tcphdr, check));
533
534 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
535 start, offset, grc, nopartial);
536
537 skb->remcsum_offload = 1;
538
539 return vh;
540 }
541
542 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
543 struct sk_buff *skb,
544 struct udp_offload *uoff)
545 {
546 struct sk_buff *p, **pp = NULL;
547 struct vxlanhdr *vh, *vh2;
548 unsigned int hlen, off_vx;
549 int flush = 1;
550 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
551 udp_offloads);
552 u32 flags;
553 struct gro_remcsum grc;
554
555 skb_gro_remcsum_init(&grc);
556
557 off_vx = skb_gro_offset(skb);
558 hlen = off_vx + sizeof(*vh);
559 vh = skb_gro_header_fast(skb, off_vx);
560 if (skb_gro_header_hard(skb, hlen)) {
561 vh = skb_gro_header_slow(skb, hlen, off_vx);
562 if (unlikely(!vh))
563 goto out;
564 }
565
566 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
567
568 flags = ntohl(vh->vx_flags);
569
570 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
571 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
572 ntohl(vh->vx_vni), &grc,
573 !!(vs->flags &
574 VXLAN_F_REMCSUM_NOPARTIAL));
575
576 if (!vh)
577 goto out;
578 }
579
580 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
581
582 flush = 0;
583
584 for (p = *head; p; p = p->next) {
585 if (!NAPI_GRO_CB(p)->same_flow)
586 continue;
587
588 vh2 = (struct vxlanhdr *)(p->data + off_vx);
589 if (vh->vx_flags != vh2->vx_flags ||
590 vh->vx_vni != vh2->vx_vni) {
591 NAPI_GRO_CB(p)->same_flow = 0;
592 continue;
593 }
594 }
595
596 pp = eth_gro_receive(head, skb);
597
598 out:
599 skb_gro_remcsum_cleanup(skb, &grc);
600 NAPI_GRO_CB(skb)->flush |= flush;
601
602 return pp;
603 }
604
605 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
606 struct udp_offload *uoff)
607 {
608 udp_tunnel_gro_complete(skb, nhoff);
609
610 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
611 }
612
613 /* Notify netdevs that UDP port started listening */
614 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
615 {
616 struct net_device *dev;
617 struct sock *sk = vs->sock->sk;
618 struct net *net = sock_net(sk);
619 sa_family_t sa_family = vxlan_get_sk_family(vs);
620 __be16 port = inet_sk(sk)->inet_sport;
621 int err;
622
623 if (sa_family == AF_INET) {
624 err = udp_add_offload(net, &vs->udp_offloads);
625 if (err)
626 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
627 }
628
629 rcu_read_lock();
630 for_each_netdev_rcu(net, dev) {
631 if (dev->netdev_ops->ndo_add_vxlan_port)
632 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
633 port);
634 }
635 rcu_read_unlock();
636 }
637
638 /* Notify netdevs that UDP port is no more listening */
639 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
640 {
641 struct net_device *dev;
642 struct sock *sk = vs->sock->sk;
643 struct net *net = sock_net(sk);
644 sa_family_t sa_family = vxlan_get_sk_family(vs);
645 __be16 port = inet_sk(sk)->inet_sport;
646
647 rcu_read_lock();
648 for_each_netdev_rcu(net, dev) {
649 if (dev->netdev_ops->ndo_del_vxlan_port)
650 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
651 port);
652 }
653 rcu_read_unlock();
654
655 if (sa_family == AF_INET)
656 udp_del_offload(&vs->udp_offloads);
657 }
658
659 /* Add new entry to forwarding table -- assumes lock held */
660 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
661 const u8 *mac, union vxlan_addr *ip,
662 __u16 state, __u16 flags,
663 __be16 port, __u32 vni, __u32 ifindex,
664 __u8 ndm_flags)
665 {
666 struct vxlan_rdst *rd = NULL;
667 struct vxlan_fdb *f;
668 int notify = 0;
669
670 f = __vxlan_find_mac(vxlan, mac);
671 if (f) {
672 if (flags & NLM_F_EXCL) {
673 netdev_dbg(vxlan->dev,
674 "lost race to create %pM\n", mac);
675 return -EEXIST;
676 }
677 if (f->state != state) {
678 f->state = state;
679 f->updated = jiffies;
680 notify = 1;
681 }
682 if (f->flags != ndm_flags) {
683 f->flags = ndm_flags;
684 f->updated = jiffies;
685 notify = 1;
686 }
687 if ((flags & NLM_F_REPLACE)) {
688 /* Only change unicasts */
689 if (!(is_multicast_ether_addr(f->eth_addr) ||
690 is_zero_ether_addr(f->eth_addr))) {
691 notify |= vxlan_fdb_replace(f, ip, port, vni,
692 ifindex);
693 } else
694 return -EOPNOTSUPP;
695 }
696 if ((flags & NLM_F_APPEND) &&
697 (is_multicast_ether_addr(f->eth_addr) ||
698 is_zero_ether_addr(f->eth_addr))) {
699 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
700 &rd);
701
702 if (rc < 0)
703 return rc;
704 notify |= rc;
705 }
706 } else {
707 if (!(flags & NLM_F_CREATE))
708 return -ENOENT;
709
710 if (vxlan->cfg.addrmax &&
711 vxlan->addrcnt >= vxlan->cfg.addrmax)
712 return -ENOSPC;
713
714 /* Disallow replace to add a multicast entry */
715 if ((flags & NLM_F_REPLACE) &&
716 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
717 return -EOPNOTSUPP;
718
719 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
720 f = kmalloc(sizeof(*f), GFP_ATOMIC);
721 if (!f)
722 return -ENOMEM;
723
724 notify = 1;
725 f->state = state;
726 f->flags = ndm_flags;
727 f->updated = f->used = jiffies;
728 INIT_LIST_HEAD(&f->remotes);
729 memcpy(f->eth_addr, mac, ETH_ALEN);
730
731 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
732
733 ++vxlan->addrcnt;
734 hlist_add_head_rcu(&f->hlist,
735 vxlan_fdb_head(vxlan, mac));
736 }
737
738 if (notify) {
739 if (rd == NULL)
740 rd = first_remote_rtnl(f);
741 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
742 }
743
744 return 0;
745 }
746
747 static void vxlan_fdb_free(struct rcu_head *head)
748 {
749 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
750 struct vxlan_rdst *rd, *nd;
751
752 list_for_each_entry_safe(rd, nd, &f->remotes, list)
753 kfree(rd);
754 kfree(f);
755 }
756
757 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
758 {
759 netdev_dbg(vxlan->dev,
760 "delete %pM\n", f->eth_addr);
761
762 --vxlan->addrcnt;
763 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
764
765 hlist_del_rcu(&f->hlist);
766 call_rcu(&f->rcu, vxlan_fdb_free);
767 }
768
769 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
770 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
771 {
772 struct net *net = dev_net(vxlan->dev);
773 int err;
774
775 if (tb[NDA_DST]) {
776 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
777 if (err)
778 return err;
779 } else {
780 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
781 if (remote->sa.sa_family == AF_INET) {
782 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
783 ip->sa.sa_family = AF_INET;
784 #if IS_ENABLED(CONFIG_IPV6)
785 } else {
786 ip->sin6.sin6_addr = in6addr_any;
787 ip->sa.sa_family = AF_INET6;
788 #endif
789 }
790 }
791
792 if (tb[NDA_PORT]) {
793 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
794 return -EINVAL;
795 *port = nla_get_be16(tb[NDA_PORT]);
796 } else {
797 *port = vxlan->cfg.dst_port;
798 }
799
800 if (tb[NDA_VNI]) {
801 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
802 return -EINVAL;
803 *vni = nla_get_u32(tb[NDA_VNI]);
804 } else {
805 *vni = vxlan->default_dst.remote_vni;
806 }
807
808 if (tb[NDA_IFINDEX]) {
809 struct net_device *tdev;
810
811 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
812 return -EINVAL;
813 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
814 tdev = __dev_get_by_index(net, *ifindex);
815 if (!tdev)
816 return -EADDRNOTAVAIL;
817 } else {
818 *ifindex = 0;
819 }
820
821 return 0;
822 }
823
824 /* Add static entry (via netlink) */
825 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
826 struct net_device *dev,
827 const unsigned char *addr, u16 vid, u16 flags)
828 {
829 struct vxlan_dev *vxlan = netdev_priv(dev);
830 /* struct net *net = dev_net(vxlan->dev); */
831 union vxlan_addr ip;
832 __be16 port;
833 u32 vni, ifindex;
834 int err;
835
836 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
837 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
838 ndm->ndm_state);
839 return -EINVAL;
840 }
841
842 if (tb[NDA_DST] == NULL)
843 return -EINVAL;
844
845 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
846 if (err)
847 return err;
848
849 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
850 return -EAFNOSUPPORT;
851
852 spin_lock_bh(&vxlan->hash_lock);
853 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
854 port, vni, ifindex, ndm->ndm_flags);
855 spin_unlock_bh(&vxlan->hash_lock);
856
857 return err;
858 }
859
860 /* Delete entry (via netlink) */
861 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
862 struct net_device *dev,
863 const unsigned char *addr, u16 vid)
864 {
865 struct vxlan_dev *vxlan = netdev_priv(dev);
866 struct vxlan_fdb *f;
867 struct vxlan_rdst *rd = NULL;
868 union vxlan_addr ip;
869 __be16 port;
870 u32 vni, ifindex;
871 int err;
872
873 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
874 if (err)
875 return err;
876
877 err = -ENOENT;
878
879 spin_lock_bh(&vxlan->hash_lock);
880 f = vxlan_find_mac(vxlan, addr);
881 if (!f)
882 goto out;
883
884 if (!vxlan_addr_any(&ip)) {
885 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
886 if (!rd)
887 goto out;
888 }
889
890 err = 0;
891
892 /* remove a destination if it's not the only one on the list,
893 * otherwise destroy the fdb entry
894 */
895 if (rd && !list_is_singular(&f->remotes)) {
896 list_del_rcu(&rd->list);
897 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
898 kfree_rcu(rd, rcu);
899 goto out;
900 }
901
902 vxlan_fdb_destroy(vxlan, f);
903
904 out:
905 spin_unlock_bh(&vxlan->hash_lock);
906
907 return err;
908 }
909
910 /* Dump forwarding table */
911 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
912 struct net_device *dev,
913 struct net_device *filter_dev, int idx)
914 {
915 struct vxlan_dev *vxlan = netdev_priv(dev);
916 unsigned int h;
917
918 for (h = 0; h < FDB_HASH_SIZE; ++h) {
919 struct vxlan_fdb *f;
920 int err;
921
922 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
923 struct vxlan_rdst *rd;
924
925 list_for_each_entry_rcu(rd, &f->remotes, list) {
926 if (idx < cb->args[0])
927 goto skip;
928
929 err = vxlan_fdb_info(skb, vxlan, f,
930 NETLINK_CB(cb->skb).portid,
931 cb->nlh->nlmsg_seq,
932 RTM_NEWNEIGH,
933 NLM_F_MULTI, rd);
934 if (err < 0)
935 goto out;
936 skip:
937 ++idx;
938 }
939 }
940 }
941 out:
942 return idx;
943 }
944
945 /* Watch incoming packets to learn mapping between Ethernet address
946 * and Tunnel endpoint.
947 * Return true if packet is bogus and should be dropped.
948 */
949 static bool vxlan_snoop(struct net_device *dev,
950 union vxlan_addr *src_ip, const u8 *src_mac)
951 {
952 struct vxlan_dev *vxlan = netdev_priv(dev);
953 struct vxlan_fdb *f;
954
955 f = vxlan_find_mac(vxlan, src_mac);
956 if (likely(f)) {
957 struct vxlan_rdst *rdst = first_remote_rcu(f);
958
959 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
960 return false;
961
962 /* Don't migrate static entries, drop packets */
963 if (f->state & NUD_NOARP)
964 return true;
965
966 if (net_ratelimit())
967 netdev_info(dev,
968 "%pM migrated from %pIS to %pIS\n",
969 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
970
971 rdst->remote_ip = *src_ip;
972 f->updated = jiffies;
973 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
974 } else {
975 /* learned new entry */
976 spin_lock(&vxlan->hash_lock);
977
978 /* close off race between vxlan_flush and incoming packets */
979 if (netif_running(dev))
980 vxlan_fdb_create(vxlan, src_mac, src_ip,
981 NUD_REACHABLE,
982 NLM_F_EXCL|NLM_F_CREATE,
983 vxlan->cfg.dst_port,
984 vxlan->default_dst.remote_vni,
985 0, NTF_SELF);
986 spin_unlock(&vxlan->hash_lock);
987 }
988
989 return false;
990 }
991
992 /* See if multicast group is already in use by other ID */
993 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
994 {
995 struct vxlan_dev *vxlan;
996 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
997
998 /* The vxlan_sock is only used by dev, leaving group has
999 * no effect on other vxlan devices.
1000 */
1001 if (family == AF_INET && dev->vn4_sock &&
1002 atomic_read(&dev->vn4_sock->refcnt) == 1)
1003 return false;
1004 #if IS_ENABLED(CONFIG_IPV6)
1005 if (family == AF_INET6 && dev->vn6_sock &&
1006 atomic_read(&dev->vn6_sock->refcnt) == 1)
1007 return false;
1008 #endif
1009
1010 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1011 if (!netif_running(vxlan->dev) || vxlan == dev)
1012 continue;
1013
1014 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1015 continue;
1016 #if IS_ENABLED(CONFIG_IPV6)
1017 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1018 continue;
1019 #endif
1020
1021 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1022 &dev->default_dst.remote_ip))
1023 continue;
1024
1025 if (vxlan->default_dst.remote_ifindex !=
1026 dev->default_dst.remote_ifindex)
1027 continue;
1028
1029 return true;
1030 }
1031
1032 return false;
1033 }
1034
1035 static void __vxlan_sock_release(struct vxlan_sock *vs)
1036 {
1037 struct vxlan_net *vn;
1038
1039 if (!vs)
1040 return;
1041 if (!atomic_dec_and_test(&vs->refcnt))
1042 return;
1043
1044 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1045 spin_lock(&vn->sock_lock);
1046 hlist_del_rcu(&vs->hlist);
1047 vxlan_notify_del_rx_port(vs);
1048 spin_unlock(&vn->sock_lock);
1049
1050 queue_work(vxlan_wq, &vs->del_work);
1051 }
1052
1053 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1054 {
1055 __vxlan_sock_release(vxlan->vn4_sock);
1056 #if IS_ENABLED(CONFIG_IPV6)
1057 __vxlan_sock_release(vxlan->vn6_sock);
1058 #endif
1059 }
1060
1061 /* Update multicast group membership when first VNI on
1062 * multicast address is brought up
1063 */
1064 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1065 {
1066 struct sock *sk;
1067 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1068 int ifindex = vxlan->default_dst.remote_ifindex;
1069 int ret = -EINVAL;
1070
1071 if (ip->sa.sa_family == AF_INET) {
1072 struct ip_mreqn mreq = {
1073 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1074 .imr_ifindex = ifindex,
1075 };
1076
1077 sk = vxlan->vn4_sock->sock->sk;
1078 lock_sock(sk);
1079 ret = ip_mc_join_group(sk, &mreq);
1080 release_sock(sk);
1081 #if IS_ENABLED(CONFIG_IPV6)
1082 } else {
1083 sk = vxlan->vn6_sock->sock->sk;
1084 lock_sock(sk);
1085 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1086 &ip->sin6.sin6_addr);
1087 release_sock(sk);
1088 #endif
1089 }
1090
1091 return ret;
1092 }
1093
1094 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1095 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1096 {
1097 struct sock *sk;
1098 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1099 int ifindex = vxlan->default_dst.remote_ifindex;
1100 int ret = -EINVAL;
1101
1102 if (ip->sa.sa_family == AF_INET) {
1103 struct ip_mreqn mreq = {
1104 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1105 .imr_ifindex = ifindex,
1106 };
1107
1108 sk = vxlan->vn4_sock->sock->sk;
1109 lock_sock(sk);
1110 ret = ip_mc_leave_group(sk, &mreq);
1111 release_sock(sk);
1112 #if IS_ENABLED(CONFIG_IPV6)
1113 } else {
1114 sk = vxlan->vn6_sock->sock->sk;
1115 lock_sock(sk);
1116 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1117 &ip->sin6.sin6_addr);
1118 release_sock(sk);
1119 #endif
1120 }
1121
1122 return ret;
1123 }
1124
1125 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1126 size_t hdrlen, u32 data, bool nopartial)
1127 {
1128 size_t start, offset, plen;
1129
1130 if (skb->remcsum_offload)
1131 return vh;
1132
1133 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1134 offset = start + ((data & VXLAN_RCO_UDP) ?
1135 offsetof(struct udphdr, check) :
1136 offsetof(struct tcphdr, check));
1137
1138 plen = hdrlen + offset + sizeof(u16);
1139
1140 if (!pskb_may_pull(skb, plen))
1141 return NULL;
1142
1143 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1144
1145 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1146 nopartial);
1147
1148 return vh;
1149 }
1150
1151 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1152 struct vxlan_metadata *md, u32 vni,
1153 struct metadata_dst *tun_dst)
1154 {
1155 struct iphdr *oip = NULL;
1156 struct ipv6hdr *oip6 = NULL;
1157 struct vxlan_dev *vxlan;
1158 struct pcpu_sw_netstats *stats;
1159 union vxlan_addr saddr;
1160 int err = 0;
1161
1162 /* For flow based devices, map all packets to VNI 0 */
1163 if (vs->flags & VXLAN_F_COLLECT_METADATA)
1164 vni = 0;
1165
1166 /* Is this VNI defined? */
1167 vxlan = vxlan_vs_find_vni(vs, vni);
1168 if (!vxlan)
1169 goto drop;
1170
1171 skb_reset_mac_header(skb);
1172 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1173 skb->protocol = eth_type_trans(skb, vxlan->dev);
1174 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1175
1176 /* Ignore packet loops (and multicast echo) */
1177 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1178 goto drop;
1179
1180 /* Get data from the outer IP header */
1181 if (vxlan_get_sk_family(vs) == AF_INET) {
1182 oip = ip_hdr(skb);
1183 saddr.sin.sin_addr.s_addr = oip->saddr;
1184 saddr.sa.sa_family = AF_INET;
1185 #if IS_ENABLED(CONFIG_IPV6)
1186 } else {
1187 oip6 = ipv6_hdr(skb);
1188 saddr.sin6.sin6_addr = oip6->saddr;
1189 saddr.sa.sa_family = AF_INET6;
1190 #endif
1191 }
1192
1193 if (tun_dst) {
1194 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1195 tun_dst = NULL;
1196 }
1197
1198 if ((vxlan->flags & VXLAN_F_LEARN) &&
1199 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1200 goto drop;
1201
1202 skb_reset_network_header(skb);
1203 /* In flow-based mode, GBP is carried in dst_metadata */
1204 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1205 skb->mark = md->gbp;
1206
1207 if (oip6)
1208 err = IP6_ECN_decapsulate(oip6, skb);
1209 if (oip)
1210 err = IP_ECN_decapsulate(oip, skb);
1211
1212 if (unlikely(err)) {
1213 if (log_ecn_error) {
1214 if (oip6)
1215 net_info_ratelimited("non-ECT from %pI6\n",
1216 &oip6->saddr);
1217 if (oip)
1218 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1219 &oip->saddr, oip->tos);
1220 }
1221 if (err > 1) {
1222 ++vxlan->dev->stats.rx_frame_errors;
1223 ++vxlan->dev->stats.rx_errors;
1224 goto drop;
1225 }
1226 }
1227
1228 stats = this_cpu_ptr(vxlan->dev->tstats);
1229 u64_stats_update_begin(&stats->syncp);
1230 stats->rx_packets++;
1231 stats->rx_bytes += skb->len;
1232 u64_stats_update_end(&stats->syncp);
1233
1234 gro_cells_receive(&vxlan->gro_cells, skb);
1235
1236 return;
1237 drop:
1238 if (tun_dst)
1239 dst_release((struct dst_entry *)tun_dst);
1240
1241 /* Consume bad packet */
1242 kfree_skb(skb);
1243 }
1244
1245 /* Callback from net/ipv4/udp.c to receive packets */
1246 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1247 {
1248 struct metadata_dst *tun_dst = NULL;
1249 struct vxlan_sock *vs;
1250 struct vxlanhdr *vxh;
1251 u32 flags, vni;
1252 struct vxlan_metadata _md;
1253 struct vxlan_metadata *md = &_md;
1254
1255 /* Need Vxlan and inner Ethernet header to be present */
1256 if (!pskb_may_pull(skb, VXLAN_HLEN))
1257 goto error;
1258
1259 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1260 flags = ntohl(vxh->vx_flags);
1261 vni = ntohl(vxh->vx_vni);
1262
1263 if (flags & VXLAN_HF_VNI) {
1264 flags &= ~VXLAN_HF_VNI;
1265 } else {
1266 /* VNI flag always required to be set */
1267 goto bad_flags;
1268 }
1269
1270 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1271 goto drop;
1272 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1273
1274 vs = rcu_dereference_sk_user_data(sk);
1275 if (!vs)
1276 goto drop;
1277
1278 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1279 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1280 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1281 if (!vxh)
1282 goto drop;
1283
1284 flags &= ~VXLAN_HF_RCO;
1285 vni &= VXLAN_VNI_MASK;
1286 }
1287
1288 if (vxlan_collect_metadata(vs)) {
1289 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1290 cpu_to_be64(vni >> 8), sizeof(*md));
1291
1292 if (!tun_dst)
1293 goto drop;
1294
1295 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1296 } else {
1297 memset(md, 0, sizeof(*md));
1298 }
1299
1300 /* For backwards compatibility, only allow reserved fields to be
1301 * used by VXLAN extensions if explicitly requested.
1302 */
1303 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1304 struct vxlanhdr_gbp *gbp;
1305
1306 gbp = (struct vxlanhdr_gbp *)vxh;
1307 md->gbp = ntohs(gbp->policy_id);
1308
1309 if (tun_dst)
1310 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1311
1312 if (gbp->dont_learn)
1313 md->gbp |= VXLAN_GBP_DONT_LEARN;
1314
1315 if (gbp->policy_applied)
1316 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1317
1318 flags &= ~VXLAN_GBP_USED_BITS;
1319 }
1320
1321 if (flags || vni & ~VXLAN_VNI_MASK) {
1322 /* If there are any unprocessed flags remaining treat
1323 * this as a malformed packet. This behavior diverges from
1324 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1325 * in reserved fields are to be ignored. The approach here
1326 * maintains compatibility with previous stack code, and also
1327 * is more robust and provides a little more security in
1328 * adding extensions to VXLAN.
1329 */
1330
1331 goto bad_flags;
1332 }
1333
1334 vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1335 return 0;
1336
1337 drop:
1338 /* Consume bad packet */
1339 kfree_skb(skb);
1340 return 0;
1341
1342 bad_flags:
1343 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1344 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1345
1346 error:
1347 if (tun_dst)
1348 dst_release((struct dst_entry *)tun_dst);
1349
1350 /* Return non vxlan pkt */
1351 return 1;
1352 }
1353
1354 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1355 {
1356 struct vxlan_dev *vxlan = netdev_priv(dev);
1357 struct arphdr *parp;
1358 u8 *arpptr, *sha;
1359 __be32 sip, tip;
1360 struct neighbour *n;
1361
1362 if (dev->flags & IFF_NOARP)
1363 goto out;
1364
1365 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1366 dev->stats.tx_dropped++;
1367 goto out;
1368 }
1369 parp = arp_hdr(skb);
1370
1371 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1372 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1373 parp->ar_pro != htons(ETH_P_IP) ||
1374 parp->ar_op != htons(ARPOP_REQUEST) ||
1375 parp->ar_hln != dev->addr_len ||
1376 parp->ar_pln != 4)
1377 goto out;
1378 arpptr = (u8 *)parp + sizeof(struct arphdr);
1379 sha = arpptr;
1380 arpptr += dev->addr_len; /* sha */
1381 memcpy(&sip, arpptr, sizeof(sip));
1382 arpptr += sizeof(sip);
1383 arpptr += dev->addr_len; /* tha */
1384 memcpy(&tip, arpptr, sizeof(tip));
1385
1386 if (ipv4_is_loopback(tip) ||
1387 ipv4_is_multicast(tip))
1388 goto out;
1389
1390 n = neigh_lookup(&arp_tbl, &tip, dev);
1391
1392 if (n) {
1393 struct vxlan_fdb *f;
1394 struct sk_buff *reply;
1395
1396 if (!(n->nud_state & NUD_CONNECTED)) {
1397 neigh_release(n);
1398 goto out;
1399 }
1400
1401 f = vxlan_find_mac(vxlan, n->ha);
1402 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1403 /* bridge-local neighbor */
1404 neigh_release(n);
1405 goto out;
1406 }
1407
1408 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1409 n->ha, sha);
1410
1411 neigh_release(n);
1412
1413 if (reply == NULL)
1414 goto out;
1415
1416 skb_reset_mac_header(reply);
1417 __skb_pull(reply, skb_network_offset(reply));
1418 reply->ip_summed = CHECKSUM_UNNECESSARY;
1419 reply->pkt_type = PACKET_HOST;
1420
1421 if (netif_rx_ni(reply) == NET_RX_DROP)
1422 dev->stats.rx_dropped++;
1423 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1424 union vxlan_addr ipa = {
1425 .sin.sin_addr.s_addr = tip,
1426 .sin.sin_family = AF_INET,
1427 };
1428
1429 vxlan_ip_miss(dev, &ipa);
1430 }
1431 out:
1432 consume_skb(skb);
1433 return NETDEV_TX_OK;
1434 }
1435
1436 #if IS_ENABLED(CONFIG_IPV6)
1437 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1438 struct neighbour *n, bool isrouter)
1439 {
1440 struct net_device *dev = request->dev;
1441 struct sk_buff *reply;
1442 struct nd_msg *ns, *na;
1443 struct ipv6hdr *pip6;
1444 u8 *daddr;
1445 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1446 int ns_olen;
1447 int i, len;
1448
1449 if (dev == NULL)
1450 return NULL;
1451
1452 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1453 sizeof(*na) + na_olen + dev->needed_tailroom;
1454 reply = alloc_skb(len, GFP_ATOMIC);
1455 if (reply == NULL)
1456 return NULL;
1457
1458 reply->protocol = htons(ETH_P_IPV6);
1459 reply->dev = dev;
1460 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1461 skb_push(reply, sizeof(struct ethhdr));
1462 skb_set_mac_header(reply, 0);
1463
1464 ns = (struct nd_msg *)skb_transport_header(request);
1465
1466 daddr = eth_hdr(request)->h_source;
1467 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1468 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1469 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1470 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1471 break;
1472 }
1473 }
1474
1475 /* Ethernet header */
1476 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1477 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1478 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1479 reply->protocol = htons(ETH_P_IPV6);
1480
1481 skb_pull(reply, sizeof(struct ethhdr));
1482 skb_set_network_header(reply, 0);
1483 skb_put(reply, sizeof(struct ipv6hdr));
1484
1485 /* IPv6 header */
1486
1487 pip6 = ipv6_hdr(reply);
1488 memset(pip6, 0, sizeof(struct ipv6hdr));
1489 pip6->version = 6;
1490 pip6->priority = ipv6_hdr(request)->priority;
1491 pip6->nexthdr = IPPROTO_ICMPV6;
1492 pip6->hop_limit = 255;
1493 pip6->daddr = ipv6_hdr(request)->saddr;
1494 pip6->saddr = *(struct in6_addr *)n->primary_key;
1495
1496 skb_pull(reply, sizeof(struct ipv6hdr));
1497 skb_set_transport_header(reply, 0);
1498
1499 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1500
1501 /* Neighbor Advertisement */
1502 memset(na, 0, sizeof(*na)+na_olen);
1503 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1504 na->icmph.icmp6_router = isrouter;
1505 na->icmph.icmp6_override = 1;
1506 na->icmph.icmp6_solicited = 1;
1507 na->target = ns->target;
1508 ether_addr_copy(&na->opt[2], n->ha);
1509 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1510 na->opt[1] = na_olen >> 3;
1511
1512 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1513 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1514 csum_partial(na, sizeof(*na)+na_olen, 0));
1515
1516 pip6->payload_len = htons(sizeof(*na)+na_olen);
1517
1518 skb_push(reply, sizeof(struct ipv6hdr));
1519
1520 reply->ip_summed = CHECKSUM_UNNECESSARY;
1521
1522 return reply;
1523 }
1524
1525 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1526 {
1527 struct vxlan_dev *vxlan = netdev_priv(dev);
1528 struct nd_msg *msg;
1529 const struct ipv6hdr *iphdr;
1530 const struct in6_addr *saddr, *daddr;
1531 struct neighbour *n;
1532 struct inet6_dev *in6_dev;
1533
1534 in6_dev = __in6_dev_get(dev);
1535 if (!in6_dev)
1536 goto out;
1537
1538 iphdr = ipv6_hdr(skb);
1539 saddr = &iphdr->saddr;
1540 daddr = &iphdr->daddr;
1541
1542 msg = (struct nd_msg *)skb_transport_header(skb);
1543 if (msg->icmph.icmp6_code != 0 ||
1544 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1545 goto out;
1546
1547 if (ipv6_addr_loopback(daddr) ||
1548 ipv6_addr_is_multicast(&msg->target))
1549 goto out;
1550
1551 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1552
1553 if (n) {
1554 struct vxlan_fdb *f;
1555 struct sk_buff *reply;
1556
1557 if (!(n->nud_state & NUD_CONNECTED)) {
1558 neigh_release(n);
1559 goto out;
1560 }
1561
1562 f = vxlan_find_mac(vxlan, n->ha);
1563 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1564 /* bridge-local neighbor */
1565 neigh_release(n);
1566 goto out;
1567 }
1568
1569 reply = vxlan_na_create(skb, n,
1570 !!(f ? f->flags & NTF_ROUTER : 0));
1571
1572 neigh_release(n);
1573
1574 if (reply == NULL)
1575 goto out;
1576
1577 if (netif_rx_ni(reply) == NET_RX_DROP)
1578 dev->stats.rx_dropped++;
1579
1580 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1581 union vxlan_addr ipa = {
1582 .sin6.sin6_addr = msg->target,
1583 .sin6.sin6_family = AF_INET6,
1584 };
1585
1586 vxlan_ip_miss(dev, &ipa);
1587 }
1588
1589 out:
1590 consume_skb(skb);
1591 return NETDEV_TX_OK;
1592 }
1593 #endif
1594
1595 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1596 {
1597 struct vxlan_dev *vxlan = netdev_priv(dev);
1598 struct neighbour *n;
1599
1600 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1601 return false;
1602
1603 n = NULL;
1604 switch (ntohs(eth_hdr(skb)->h_proto)) {
1605 case ETH_P_IP:
1606 {
1607 struct iphdr *pip;
1608
1609 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1610 return false;
1611 pip = ip_hdr(skb);
1612 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1613 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1614 union vxlan_addr ipa = {
1615 .sin.sin_addr.s_addr = pip->daddr,
1616 .sin.sin_family = AF_INET,
1617 };
1618
1619 vxlan_ip_miss(dev, &ipa);
1620 return false;
1621 }
1622
1623 break;
1624 }
1625 #if IS_ENABLED(CONFIG_IPV6)
1626 case ETH_P_IPV6:
1627 {
1628 struct ipv6hdr *pip6;
1629
1630 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1631 return false;
1632 pip6 = ipv6_hdr(skb);
1633 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1634 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1635 union vxlan_addr ipa = {
1636 .sin6.sin6_addr = pip6->daddr,
1637 .sin6.sin6_family = AF_INET6,
1638 };
1639
1640 vxlan_ip_miss(dev, &ipa);
1641 return false;
1642 }
1643
1644 break;
1645 }
1646 #endif
1647 default:
1648 return false;
1649 }
1650
1651 if (n) {
1652 bool diff;
1653
1654 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1655 if (diff) {
1656 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1657 dev->addr_len);
1658 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1659 }
1660 neigh_release(n);
1661 return diff;
1662 }
1663
1664 return false;
1665 }
1666
1667 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1668 struct vxlan_metadata *md)
1669 {
1670 struct vxlanhdr_gbp *gbp;
1671
1672 if (!md->gbp)
1673 return;
1674
1675 gbp = (struct vxlanhdr_gbp *)vxh;
1676 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1677
1678 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1679 gbp->dont_learn = 1;
1680
1681 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1682 gbp->policy_applied = 1;
1683
1684 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1685 }
1686
1687 #if IS_ENABLED(CONFIG_IPV6)
1688 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1689 struct sk_buff *skb,
1690 struct net_device *dev, struct in6_addr *saddr,
1691 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1692 __be16 src_port, __be16 dst_port, __be32 vni,
1693 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1694 {
1695 struct vxlanhdr *vxh;
1696 int min_headroom;
1697 int err;
1698 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1699 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1700 u16 hdrlen = sizeof(struct vxlanhdr);
1701
1702 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1703 skb->ip_summed == CHECKSUM_PARTIAL) {
1704 int csum_start = skb_checksum_start_offset(skb);
1705
1706 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1707 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1708 (skb->csum_offset == offsetof(struct udphdr, check) ||
1709 skb->csum_offset == offsetof(struct tcphdr, check))) {
1710 udp_sum = false;
1711 type |= SKB_GSO_TUNNEL_REMCSUM;
1712 }
1713 }
1714
1715 skb_scrub_packet(skb, xnet);
1716
1717 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1718 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1719 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1720
1721 /* Need space for new headers (invalidates iph ptr) */
1722 err = skb_cow_head(skb, min_headroom);
1723 if (unlikely(err)) {
1724 kfree_skb(skb);
1725 goto err;
1726 }
1727
1728 skb = vlan_hwaccel_push_inside(skb);
1729 if (WARN_ON(!skb)) {
1730 err = -ENOMEM;
1731 goto err;
1732 }
1733
1734 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1735 if (IS_ERR(skb)) {
1736 err = -EINVAL;
1737 goto err;
1738 }
1739
1740 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1741 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1742 vxh->vx_vni = vni;
1743
1744 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1745 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1746 VXLAN_RCO_SHIFT;
1747
1748 if (skb->csum_offset == offsetof(struct udphdr, check))
1749 data |= VXLAN_RCO_UDP;
1750
1751 vxh->vx_vni |= htonl(data);
1752 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1753
1754 if (!skb_is_gso(skb)) {
1755 skb->ip_summed = CHECKSUM_NONE;
1756 skb->encapsulation = 0;
1757 }
1758 }
1759
1760 if (vxflags & VXLAN_F_GBP)
1761 vxlan_build_gbp_hdr(vxh, vxflags, md);
1762
1763 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1764
1765 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1766 ttl, src_port, dst_port,
1767 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1768 return 0;
1769 err:
1770 dst_release(dst);
1771 return err;
1772 }
1773 #endif
1774
1775 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1776 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1777 __be16 src_port, __be16 dst_port, __be32 vni,
1778 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1779 {
1780 struct vxlanhdr *vxh;
1781 int min_headroom;
1782 int err;
1783 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1784 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1785 u16 hdrlen = sizeof(struct vxlanhdr);
1786
1787 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1788 skb->ip_summed == CHECKSUM_PARTIAL) {
1789 int csum_start = skb_checksum_start_offset(skb);
1790
1791 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1792 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1793 (skb->csum_offset == offsetof(struct udphdr, check) ||
1794 skb->csum_offset == offsetof(struct tcphdr, check))) {
1795 udp_sum = false;
1796 type |= SKB_GSO_TUNNEL_REMCSUM;
1797 }
1798 }
1799
1800 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1801 + VXLAN_HLEN + sizeof(struct iphdr)
1802 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1803
1804 /* Need space for new headers (invalidates iph ptr) */
1805 err = skb_cow_head(skb, min_headroom);
1806 if (unlikely(err)) {
1807 kfree_skb(skb);
1808 return err;
1809 }
1810
1811 skb = vlan_hwaccel_push_inside(skb);
1812 if (WARN_ON(!skb))
1813 return -ENOMEM;
1814
1815 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1816 if (IS_ERR(skb))
1817 return PTR_ERR(skb);
1818
1819 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1820 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1821 vxh->vx_vni = vni;
1822
1823 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1824 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1825 VXLAN_RCO_SHIFT;
1826
1827 if (skb->csum_offset == offsetof(struct udphdr, check))
1828 data |= VXLAN_RCO_UDP;
1829
1830 vxh->vx_vni |= htonl(data);
1831 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1832
1833 if (!skb_is_gso(skb)) {
1834 skb->ip_summed = CHECKSUM_NONE;
1835 skb->encapsulation = 0;
1836 }
1837 }
1838
1839 if (vxflags & VXLAN_F_GBP)
1840 vxlan_build_gbp_hdr(vxh, vxflags, md);
1841
1842 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1843
1844 udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,
1845 src_port, dst_port, xnet,
1846 !(vxflags & VXLAN_F_UDP_CSUM));
1847 return 0;
1848 }
1849
1850 #if IS_ENABLED(CONFIG_IPV6)
1851 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1852 struct sk_buff *skb, int oif,
1853 const struct in6_addr *daddr,
1854 struct in6_addr *saddr)
1855 {
1856 struct dst_entry *ndst;
1857 struct flowi6 fl6;
1858 int err;
1859
1860 memset(&fl6, 0, sizeof(fl6));
1861 fl6.flowi6_oif = oif;
1862 fl6.daddr = *daddr;
1863 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1864 fl6.flowi6_mark = skb->mark;
1865 fl6.flowi6_proto = IPPROTO_UDP;
1866
1867 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1868 vxlan->vn6_sock->sock->sk,
1869 &ndst, &fl6);
1870 if (err < 0)
1871 return ERR_PTR(err);
1872
1873 *saddr = fl6.saddr;
1874 return ndst;
1875 }
1876 #endif
1877
1878 /* Bypass encapsulation if the destination is local */
1879 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1880 struct vxlan_dev *dst_vxlan)
1881 {
1882 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1883 union vxlan_addr loopback;
1884 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1885 struct net_device *dev = skb->dev;
1886 int len = skb->len;
1887
1888 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1889 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1890 skb->pkt_type = PACKET_HOST;
1891 skb->encapsulation = 0;
1892 skb->dev = dst_vxlan->dev;
1893 __skb_pull(skb, skb_network_offset(skb));
1894
1895 if (remote_ip->sa.sa_family == AF_INET) {
1896 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1897 loopback.sa.sa_family = AF_INET;
1898 #if IS_ENABLED(CONFIG_IPV6)
1899 } else {
1900 loopback.sin6.sin6_addr = in6addr_loopback;
1901 loopback.sa.sa_family = AF_INET6;
1902 #endif
1903 }
1904
1905 if (dst_vxlan->flags & VXLAN_F_LEARN)
1906 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1907
1908 u64_stats_update_begin(&tx_stats->syncp);
1909 tx_stats->tx_packets++;
1910 tx_stats->tx_bytes += len;
1911 u64_stats_update_end(&tx_stats->syncp);
1912
1913 if (netif_rx(skb) == NET_RX_SUCCESS) {
1914 u64_stats_update_begin(&rx_stats->syncp);
1915 rx_stats->rx_packets++;
1916 rx_stats->rx_bytes += len;
1917 u64_stats_update_end(&rx_stats->syncp);
1918 } else {
1919 dev->stats.rx_dropped++;
1920 }
1921 }
1922
1923 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1924 struct vxlan_rdst *rdst, bool did_rsc)
1925 {
1926 struct ip_tunnel_info *info;
1927 struct vxlan_dev *vxlan = netdev_priv(dev);
1928 struct sock *sk;
1929 struct rtable *rt = NULL;
1930 const struct iphdr *old_iph;
1931 struct flowi4 fl4;
1932 union vxlan_addr *dst;
1933 union vxlan_addr remote_ip;
1934 struct vxlan_metadata _md;
1935 struct vxlan_metadata *md = &_md;
1936 __be16 src_port = 0, dst_port;
1937 u32 vni;
1938 __be16 df = 0;
1939 __u8 tos, ttl;
1940 int err;
1941 u32 flags = vxlan->flags;
1942
1943 info = skb_tunnel_info(skb);
1944
1945 if (rdst) {
1946 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1947 vni = rdst->remote_vni;
1948 dst = &rdst->remote_ip;
1949 } else {
1950 if (!info) {
1951 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1952 dev->name);
1953 goto drop;
1954 }
1955 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1956 vni = be64_to_cpu(info->key.tun_id);
1957 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1958 if (remote_ip.sa.sa_family == AF_INET)
1959 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1960 else
1961 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1962 dst = &remote_ip;
1963 }
1964
1965 if (vxlan_addr_any(dst)) {
1966 if (did_rsc) {
1967 /* short-circuited back to local bridge */
1968 vxlan_encap_bypass(skb, vxlan, vxlan);
1969 return;
1970 }
1971 goto drop;
1972 }
1973
1974 old_iph = ip_hdr(skb);
1975
1976 ttl = vxlan->cfg.ttl;
1977 if (!ttl && vxlan_addr_multicast(dst))
1978 ttl = 1;
1979
1980 tos = vxlan->cfg.tos;
1981 if (tos == 1)
1982 tos = ip_tunnel_get_dsfield(old_iph, skb);
1983
1984 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1985 vxlan->cfg.port_max, true);
1986
1987 if (info) {
1988 if (info->key.tun_flags & TUNNEL_CSUM)
1989 flags |= VXLAN_F_UDP_CSUM;
1990 else
1991 flags &= ~VXLAN_F_UDP_CSUM;
1992
1993 ttl = info->key.ttl;
1994 tos = info->key.tos;
1995
1996 if (info->options_len)
1997 md = ip_tunnel_info_opts(info);
1998 } else {
1999 md->gbp = skb->mark;
2000 }
2001
2002 if (dst->sa.sa_family == AF_INET) {
2003 if (!vxlan->vn4_sock)
2004 goto drop;
2005 sk = vxlan->vn4_sock->sock->sk;
2006
2007 if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
2008 df = htons(IP_DF);
2009
2010 memset(&fl4, 0, sizeof(fl4));
2011 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
2012 fl4.flowi4_tos = RT_TOS(tos);
2013 fl4.flowi4_mark = skb->mark;
2014 fl4.flowi4_proto = IPPROTO_UDP;
2015 fl4.daddr = dst->sin.sin_addr.s_addr;
2016 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2017
2018 rt = ip_route_output_key(vxlan->net, &fl4);
2019 if (IS_ERR(rt)) {
2020 netdev_dbg(dev, "no route to %pI4\n",
2021 &dst->sin.sin_addr.s_addr);
2022 dev->stats.tx_carrier_errors++;
2023 goto tx_error;
2024 }
2025
2026 if (rt->dst.dev == dev) {
2027 netdev_dbg(dev, "circular route to %pI4\n",
2028 &dst->sin.sin_addr.s_addr);
2029 dev->stats.collisions++;
2030 goto rt_tx_error;
2031 }
2032
2033 /* Bypass encapsulation if the destination is local */
2034 if (rt->rt_flags & RTCF_LOCAL &&
2035 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2036 struct vxlan_dev *dst_vxlan;
2037
2038 ip_rt_put(rt);
2039 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2040 dst->sa.sa_family, dst_port,
2041 vxlan->flags);
2042 if (!dst_vxlan)
2043 goto tx_error;
2044 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2045 return;
2046 }
2047
2048 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2049 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2050 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2051 dst->sin.sin_addr.s_addr, tos, ttl, df,
2052 src_port, dst_port, htonl(vni << 8), md,
2053 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2054 flags);
2055 if (err < 0) {
2056 /* skb is already freed. */
2057 skb = NULL;
2058 goto rt_tx_error;
2059 }
2060 #if IS_ENABLED(CONFIG_IPV6)
2061 } else {
2062 struct dst_entry *ndst;
2063 struct in6_addr saddr;
2064 u32 rt6i_flags;
2065
2066 if (!vxlan->vn6_sock)
2067 goto drop;
2068 sk = vxlan->vn6_sock->sock->sk;
2069
2070 ndst = vxlan6_get_route(vxlan, skb,
2071 rdst ? rdst->remote_ifindex : 0,
2072 &dst->sin6.sin6_addr, &saddr);
2073 if (IS_ERR(ndst)) {
2074 netdev_dbg(dev, "no route to %pI6\n",
2075 &dst->sin6.sin6_addr);
2076 dev->stats.tx_carrier_errors++;
2077 goto tx_error;
2078 }
2079
2080 if (ndst->dev == dev) {
2081 netdev_dbg(dev, "circular route to %pI6\n",
2082 &dst->sin6.sin6_addr);
2083 dst_release(ndst);
2084 dev->stats.collisions++;
2085 goto tx_error;
2086 }
2087
2088 /* Bypass encapsulation if the destination is local */
2089 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2090 if (rt6i_flags & RTF_LOCAL &&
2091 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2092 struct vxlan_dev *dst_vxlan;
2093
2094 dst_release(ndst);
2095 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2096 dst->sa.sa_family, dst_port,
2097 vxlan->flags);
2098 if (!dst_vxlan)
2099 goto tx_error;
2100 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2101 return;
2102 }
2103
2104 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2105 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2106 0, ttl, src_port, dst_port, htonl(vni << 8), md,
2107 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2108 flags);
2109 #endif
2110 }
2111
2112 return;
2113
2114 drop:
2115 dev->stats.tx_dropped++;
2116 goto tx_free;
2117
2118 rt_tx_error:
2119 ip_rt_put(rt);
2120 tx_error:
2121 dev->stats.tx_errors++;
2122 tx_free:
2123 dev_kfree_skb(skb);
2124 }
2125
2126 /* Transmit local packets over Vxlan
2127 *
2128 * Outer IP header inherits ECN and DF from inner header.
2129 * Outer UDP destination is the VXLAN assigned port.
2130 * source port is based on hash of flow
2131 */
2132 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2133 {
2134 struct vxlan_dev *vxlan = netdev_priv(dev);
2135 const struct ip_tunnel_info *info;
2136 struct ethhdr *eth;
2137 bool did_rsc = false;
2138 struct vxlan_rdst *rdst, *fdst = NULL;
2139 struct vxlan_fdb *f;
2140
2141 info = skb_tunnel_info(skb);
2142
2143 skb_reset_mac_header(skb);
2144 eth = eth_hdr(skb);
2145
2146 if ((vxlan->flags & VXLAN_F_PROXY)) {
2147 if (ntohs(eth->h_proto) == ETH_P_ARP)
2148 return arp_reduce(dev, skb);
2149 #if IS_ENABLED(CONFIG_IPV6)
2150 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2151 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2152 + sizeof(struct nd_msg)) &&
2153 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2154 struct nd_msg *msg;
2155
2156 msg = (struct nd_msg *)skb_transport_header(skb);
2157 if (msg->icmph.icmp6_code == 0 &&
2158 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2159 return neigh_reduce(dev, skb);
2160 }
2161 eth = eth_hdr(skb);
2162 #endif
2163 }
2164
2165 if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2166 info && info->mode & IP_TUNNEL_INFO_TX) {
2167 vxlan_xmit_one(skb, dev, NULL, false);
2168 return NETDEV_TX_OK;
2169 }
2170
2171 f = vxlan_find_mac(vxlan, eth->h_dest);
2172 did_rsc = false;
2173
2174 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2175 (ntohs(eth->h_proto) == ETH_P_IP ||
2176 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2177 did_rsc = route_shortcircuit(dev, skb);
2178 if (did_rsc)
2179 f = vxlan_find_mac(vxlan, eth->h_dest);
2180 }
2181
2182 if (f == NULL) {
2183 f = vxlan_find_mac(vxlan, all_zeros_mac);
2184 if (f == NULL) {
2185 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2186 !is_multicast_ether_addr(eth->h_dest))
2187 vxlan_fdb_miss(vxlan, eth->h_dest);
2188
2189 dev->stats.tx_dropped++;
2190 kfree_skb(skb);
2191 return NETDEV_TX_OK;
2192 }
2193 }
2194
2195 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2196 struct sk_buff *skb1;
2197
2198 if (!fdst) {
2199 fdst = rdst;
2200 continue;
2201 }
2202 skb1 = skb_clone(skb, GFP_ATOMIC);
2203 if (skb1)
2204 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2205 }
2206
2207 if (fdst)
2208 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2209 else
2210 kfree_skb(skb);
2211 return NETDEV_TX_OK;
2212 }
2213
2214 /* Walk the forwarding table and purge stale entries */
2215 static void vxlan_cleanup(unsigned long arg)
2216 {
2217 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2218 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2219 unsigned int h;
2220
2221 if (!netif_running(vxlan->dev))
2222 return;
2223
2224 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2225 struct hlist_node *p, *n;
2226
2227 spin_lock_bh(&vxlan->hash_lock);
2228 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2229 struct vxlan_fdb *f
2230 = container_of(p, struct vxlan_fdb, hlist);
2231 unsigned long timeout;
2232
2233 if (f->state & NUD_PERMANENT)
2234 continue;
2235
2236 timeout = f->used + vxlan->cfg.age_interval * HZ;
2237 if (time_before_eq(timeout, jiffies)) {
2238 netdev_dbg(vxlan->dev,
2239 "garbage collect %pM\n",
2240 f->eth_addr);
2241 f->state = NUD_STALE;
2242 vxlan_fdb_destroy(vxlan, f);
2243 } else if (time_before(timeout, next_timer))
2244 next_timer = timeout;
2245 }
2246 spin_unlock_bh(&vxlan->hash_lock);
2247 }
2248
2249 mod_timer(&vxlan->age_timer, next_timer);
2250 }
2251
2252 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2253 {
2254 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2255 __u32 vni = vxlan->default_dst.remote_vni;
2256
2257 spin_lock(&vn->sock_lock);
2258 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2259 spin_unlock(&vn->sock_lock);
2260 }
2261
2262 /* Setup stats when device is created */
2263 static int vxlan_init(struct net_device *dev)
2264 {
2265 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2266 if (!dev->tstats)
2267 return -ENOMEM;
2268
2269 return 0;
2270 }
2271
2272 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2273 {
2274 struct vxlan_fdb *f;
2275
2276 spin_lock_bh(&vxlan->hash_lock);
2277 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2278 if (f)
2279 vxlan_fdb_destroy(vxlan, f);
2280 spin_unlock_bh(&vxlan->hash_lock);
2281 }
2282
2283 static void vxlan_uninit(struct net_device *dev)
2284 {
2285 struct vxlan_dev *vxlan = netdev_priv(dev);
2286
2287 vxlan_fdb_delete_default(vxlan);
2288
2289 free_percpu(dev->tstats);
2290 }
2291
2292 /* Start ageing timer and join group when device is brought up */
2293 static int vxlan_open(struct net_device *dev)
2294 {
2295 struct vxlan_dev *vxlan = netdev_priv(dev);
2296 int ret;
2297
2298 ret = vxlan_sock_add(vxlan);
2299 if (ret < 0)
2300 return ret;
2301
2302 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2303 ret = vxlan_igmp_join(vxlan);
2304 if (ret == -EADDRINUSE)
2305 ret = 0;
2306 if (ret) {
2307 vxlan_sock_release(vxlan);
2308 return ret;
2309 }
2310 }
2311
2312 if (vxlan->cfg.age_interval)
2313 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2314
2315 return ret;
2316 }
2317
2318 /* Purge the forwarding table */
2319 static void vxlan_flush(struct vxlan_dev *vxlan)
2320 {
2321 unsigned int h;
2322
2323 spin_lock_bh(&vxlan->hash_lock);
2324 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2325 struct hlist_node *p, *n;
2326 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2327 struct vxlan_fdb *f
2328 = container_of(p, struct vxlan_fdb, hlist);
2329 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2330 if (!is_zero_ether_addr(f->eth_addr))
2331 vxlan_fdb_destroy(vxlan, f);
2332 }
2333 }
2334 spin_unlock_bh(&vxlan->hash_lock);
2335 }
2336
2337 /* Cleanup timer and forwarding table on shutdown */
2338 static int vxlan_stop(struct net_device *dev)
2339 {
2340 struct vxlan_dev *vxlan = netdev_priv(dev);
2341 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2342 int ret = 0;
2343
2344 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2345 !vxlan_group_used(vn, vxlan))
2346 ret = vxlan_igmp_leave(vxlan);
2347
2348 del_timer_sync(&vxlan->age_timer);
2349
2350 vxlan_flush(vxlan);
2351 vxlan_sock_release(vxlan);
2352
2353 return ret;
2354 }
2355
2356 /* Stub, nothing needs to be done. */
2357 static void vxlan_set_multicast_list(struct net_device *dev)
2358 {
2359 }
2360
2361 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2362 {
2363 struct vxlan_dev *vxlan = netdev_priv(dev);
2364 struct vxlan_rdst *dst = &vxlan->default_dst;
2365 struct net_device *lowerdev;
2366 int max_mtu;
2367
2368 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2369 if (lowerdev == NULL)
2370 return eth_change_mtu(dev, new_mtu);
2371
2372 if (dst->remote_ip.sa.sa_family == AF_INET6)
2373 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2374 else
2375 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2376
2377 if (new_mtu < 68 || new_mtu > max_mtu)
2378 return -EINVAL;
2379
2380 dev->mtu = new_mtu;
2381 return 0;
2382 }
2383
2384 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2385 struct ip_tunnel_info *info,
2386 __be16 sport, __be16 dport)
2387 {
2388 struct vxlan_dev *vxlan = netdev_priv(dev);
2389 struct rtable *rt;
2390 struct flowi4 fl4;
2391
2392 memset(&fl4, 0, sizeof(fl4));
2393 fl4.flowi4_tos = RT_TOS(info->key.tos);
2394 fl4.flowi4_mark = skb->mark;
2395 fl4.flowi4_proto = IPPROTO_UDP;
2396 fl4.daddr = info->key.u.ipv4.dst;
2397
2398 rt = ip_route_output_key(vxlan->net, &fl4);
2399 if (IS_ERR(rt))
2400 return PTR_ERR(rt);
2401 ip_rt_put(rt);
2402
2403 info->key.u.ipv4.src = fl4.saddr;
2404 info->key.tp_src = sport;
2405 info->key.tp_dst = dport;
2406 return 0;
2407 }
2408
2409 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2410 {
2411 struct vxlan_dev *vxlan = netdev_priv(dev);
2412 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2413 __be16 sport, dport;
2414
2415 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2416 vxlan->cfg.port_max, true);
2417 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2418
2419 if (ip_tunnel_info_af(info) == AF_INET) {
2420 if (!vxlan->vn4_sock)
2421 return -EINVAL;
2422 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2423 } else {
2424 #if IS_ENABLED(CONFIG_IPV6)
2425 struct dst_entry *ndst;
2426
2427 if (!vxlan->vn6_sock)
2428 return -EINVAL;
2429 ndst = vxlan6_get_route(vxlan, skb, 0,
2430 &info->key.u.ipv6.dst,
2431 &info->key.u.ipv6.src);
2432 if (IS_ERR(ndst))
2433 return PTR_ERR(ndst);
2434 dst_release(ndst);
2435
2436 info->key.tp_src = sport;
2437 info->key.tp_dst = dport;
2438 #else /* !CONFIG_IPV6 */
2439 return -EPFNOSUPPORT;
2440 #endif
2441 }
2442 return 0;
2443 }
2444
2445 static const struct net_device_ops vxlan_netdev_ops = {
2446 .ndo_init = vxlan_init,
2447 .ndo_uninit = vxlan_uninit,
2448 .ndo_open = vxlan_open,
2449 .ndo_stop = vxlan_stop,
2450 .ndo_start_xmit = vxlan_xmit,
2451 .ndo_get_stats64 = ip_tunnel_get_stats64,
2452 .ndo_set_rx_mode = vxlan_set_multicast_list,
2453 .ndo_change_mtu = vxlan_change_mtu,
2454 .ndo_validate_addr = eth_validate_addr,
2455 .ndo_set_mac_address = eth_mac_addr,
2456 .ndo_fdb_add = vxlan_fdb_add,
2457 .ndo_fdb_del = vxlan_fdb_delete,
2458 .ndo_fdb_dump = vxlan_fdb_dump,
2459 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2460 };
2461
2462 /* Info for udev, that this is a virtual tunnel endpoint */
2463 static struct device_type vxlan_type = {
2464 .name = "vxlan",
2465 };
2466
2467 /* Calls the ndo_add_vxlan_port of the caller in order to
2468 * supply the listening VXLAN udp ports. Callers are expected
2469 * to implement the ndo_add_vxlan_port.
2470 */
2471 void vxlan_get_rx_port(struct net_device *dev)
2472 {
2473 struct vxlan_sock *vs;
2474 struct net *net = dev_net(dev);
2475 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2476 sa_family_t sa_family;
2477 __be16 port;
2478 unsigned int i;
2479
2480 spin_lock(&vn->sock_lock);
2481 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2482 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2483 port = inet_sk(vs->sock->sk)->inet_sport;
2484 sa_family = vxlan_get_sk_family(vs);
2485 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2486 port);
2487 }
2488 }
2489 spin_unlock(&vn->sock_lock);
2490 }
2491 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2492
2493 /* Initialize the device structure. */
2494 static void vxlan_setup(struct net_device *dev)
2495 {
2496 struct vxlan_dev *vxlan = netdev_priv(dev);
2497 unsigned int h;
2498
2499 eth_hw_addr_random(dev);
2500 ether_setup(dev);
2501
2502 dev->netdev_ops = &vxlan_netdev_ops;
2503 dev->destructor = free_netdev;
2504 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2505
2506 dev->features |= NETIF_F_LLTX;
2507 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2508 dev->features |= NETIF_F_RXCSUM;
2509 dev->features |= NETIF_F_GSO_SOFTWARE;
2510
2511 dev->vlan_features = dev->features;
2512 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2513 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2514 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2515 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2516 netif_keep_dst(dev);
2517 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2518
2519 INIT_LIST_HEAD(&vxlan->next);
2520 spin_lock_init(&vxlan->hash_lock);
2521
2522 init_timer_deferrable(&vxlan->age_timer);
2523 vxlan->age_timer.function = vxlan_cleanup;
2524 vxlan->age_timer.data = (unsigned long) vxlan;
2525
2526 vxlan->cfg.dst_port = htons(vxlan_port);
2527
2528 vxlan->dev = dev;
2529
2530 gro_cells_init(&vxlan->gro_cells, dev);
2531
2532 for (h = 0; h < FDB_HASH_SIZE; ++h)
2533 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2534 }
2535
2536 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2537 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2538 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2539 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2540 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2541 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2542 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2543 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2544 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2545 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2546 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2547 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2548 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2549 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2550 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2551 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2552 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2553 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2554 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2555 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2556 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2557 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2558 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2559 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2560 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2561 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2562 };
2563
2564 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2565 {
2566 if (tb[IFLA_ADDRESS]) {
2567 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2568 pr_debug("invalid link address (not ethernet)\n");
2569 return -EINVAL;
2570 }
2571
2572 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2573 pr_debug("invalid all zero ethernet address\n");
2574 return -EADDRNOTAVAIL;
2575 }
2576 }
2577
2578 if (!data)
2579 return -EINVAL;
2580
2581 if (data[IFLA_VXLAN_ID]) {
2582 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2583 if (id >= VXLAN_VID_MASK)
2584 return -ERANGE;
2585 }
2586
2587 if (data[IFLA_VXLAN_PORT_RANGE]) {
2588 const struct ifla_vxlan_port_range *p
2589 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2590
2591 if (ntohs(p->high) < ntohs(p->low)) {
2592 pr_debug("port range %u .. %u not valid\n",
2593 ntohs(p->low), ntohs(p->high));
2594 return -EINVAL;
2595 }
2596 }
2597
2598 return 0;
2599 }
2600
2601 static void vxlan_get_drvinfo(struct net_device *netdev,
2602 struct ethtool_drvinfo *drvinfo)
2603 {
2604 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2605 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2606 }
2607
2608 static const struct ethtool_ops vxlan_ethtool_ops = {
2609 .get_drvinfo = vxlan_get_drvinfo,
2610 .get_link = ethtool_op_get_link,
2611 };
2612
2613 static void vxlan_del_work(struct work_struct *work)
2614 {
2615 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2616 udp_tunnel_sock_release(vs->sock);
2617 kfree_rcu(vs, rcu);
2618 }
2619
2620 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2621 __be16 port, u32 flags)
2622 {
2623 struct socket *sock;
2624 struct udp_port_cfg udp_conf;
2625 int err;
2626
2627 memset(&udp_conf, 0, sizeof(udp_conf));
2628
2629 if (ipv6) {
2630 udp_conf.family = AF_INET6;
2631 udp_conf.use_udp6_rx_checksums =
2632 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2633 udp_conf.ipv6_v6only = 1;
2634 } else {
2635 udp_conf.family = AF_INET;
2636 }
2637
2638 udp_conf.local_udp_port = port;
2639
2640 /* Open UDP socket */
2641 err = udp_sock_create(net, &udp_conf, &sock);
2642 if (err < 0)
2643 return ERR_PTR(err);
2644
2645 return sock;
2646 }
2647
2648 /* Create new listen socket if needed */
2649 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2650 __be16 port, u32 flags)
2651 {
2652 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2653 struct vxlan_sock *vs;
2654 struct socket *sock;
2655 unsigned int h;
2656 struct udp_tunnel_sock_cfg tunnel_cfg;
2657
2658 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2659 if (!vs)
2660 return ERR_PTR(-ENOMEM);
2661
2662 for (h = 0; h < VNI_HASH_SIZE; ++h)
2663 INIT_HLIST_HEAD(&vs->vni_list[h]);
2664
2665 INIT_WORK(&vs->del_work, vxlan_del_work);
2666
2667 sock = vxlan_create_sock(net, ipv6, port, flags);
2668 if (IS_ERR(sock)) {
2669 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2670 PTR_ERR(sock));
2671 kfree(vs);
2672 return ERR_CAST(sock);
2673 }
2674
2675 vs->sock = sock;
2676 atomic_set(&vs->refcnt, 1);
2677 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2678
2679 /* Initialize the vxlan udp offloads structure */
2680 vs->udp_offloads.port = port;
2681 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2682 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2683
2684 spin_lock(&vn->sock_lock);
2685 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2686 vxlan_notify_add_rx_port(vs);
2687 spin_unlock(&vn->sock_lock);
2688
2689 /* Mark socket as an encapsulation socket. */
2690 tunnel_cfg.sk_user_data = vs;
2691 tunnel_cfg.encap_type = 1;
2692 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2693 tunnel_cfg.encap_destroy = NULL;
2694
2695 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2696
2697 return vs;
2698 }
2699
2700 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2701 {
2702 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2703 struct vxlan_sock *vs = NULL;
2704
2705 if (!vxlan->cfg.no_share) {
2706 spin_lock(&vn->sock_lock);
2707 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2708 vxlan->cfg.dst_port, vxlan->flags);
2709 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2710 spin_unlock(&vn->sock_lock);
2711 return -EBUSY;
2712 }
2713 spin_unlock(&vn->sock_lock);
2714 }
2715 if (!vs)
2716 vs = vxlan_socket_create(vxlan->net, ipv6,
2717 vxlan->cfg.dst_port, vxlan->flags);
2718 if (IS_ERR(vs))
2719 return PTR_ERR(vs);
2720 #if IS_ENABLED(CONFIG_IPV6)
2721 if (ipv6)
2722 vxlan->vn6_sock = vs;
2723 else
2724 #endif
2725 vxlan->vn4_sock = vs;
2726 vxlan_vs_add_dev(vs, vxlan);
2727 return 0;
2728 }
2729
2730 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2731 {
2732 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2733 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2734 int ret = 0;
2735
2736 vxlan->vn4_sock = NULL;
2737 #if IS_ENABLED(CONFIG_IPV6)
2738 vxlan->vn6_sock = NULL;
2739 if (ipv6 || metadata)
2740 ret = __vxlan_sock_add(vxlan, true);
2741 #endif
2742 if (!ret && (!ipv6 || metadata))
2743 ret = __vxlan_sock_add(vxlan, false);
2744 if (ret < 0)
2745 vxlan_sock_release(vxlan);
2746 return ret;
2747 }
2748
2749 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2750 struct vxlan_config *conf)
2751 {
2752 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2753 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2754 struct vxlan_rdst *dst = &vxlan->default_dst;
2755 unsigned short needed_headroom = ETH_HLEN;
2756 int err;
2757 bool use_ipv6 = false;
2758 __be16 default_port = vxlan->cfg.dst_port;
2759
2760 vxlan->net = src_net;
2761
2762 dst->remote_vni = conf->vni;
2763
2764 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2765
2766 /* Unless IPv6 is explicitly requested, assume IPv4 */
2767 if (!dst->remote_ip.sa.sa_family)
2768 dst->remote_ip.sa.sa_family = AF_INET;
2769
2770 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2771 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2772 if (!IS_ENABLED(CONFIG_IPV6))
2773 return -EPFNOSUPPORT;
2774 use_ipv6 = true;
2775 vxlan->flags |= VXLAN_F_IPV6;
2776 }
2777
2778 if (conf->remote_ifindex) {
2779 struct net_device *lowerdev
2780 = __dev_get_by_index(src_net, conf->remote_ifindex);
2781
2782 dst->remote_ifindex = conf->remote_ifindex;
2783
2784 if (!lowerdev) {
2785 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2786 return -ENODEV;
2787 }
2788
2789 #if IS_ENABLED(CONFIG_IPV6)
2790 if (use_ipv6) {
2791 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2792 if (idev && idev->cnf.disable_ipv6) {
2793 pr_info("IPv6 is disabled via sysctl\n");
2794 return -EPERM;
2795 }
2796 }
2797 #endif
2798
2799 if (!conf->mtu)
2800 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2801
2802 needed_headroom = lowerdev->hard_header_len;
2803 }
2804
2805 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2806 needed_headroom += VXLAN6_HEADROOM;
2807 else
2808 needed_headroom += VXLAN_HEADROOM;
2809 dev->needed_headroom = needed_headroom;
2810
2811 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2812 if (!vxlan->cfg.dst_port)
2813 vxlan->cfg.dst_port = default_port;
2814 vxlan->flags |= conf->flags;
2815
2816 if (!vxlan->cfg.age_interval)
2817 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2818
2819 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2820 if (tmp->cfg.vni == conf->vni &&
2821 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2822 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2823 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2824 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2825 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2826 return -EEXIST;
2827 }
2828
2829 dev->ethtool_ops = &vxlan_ethtool_ops;
2830
2831 /* create an fdb entry for a valid default destination */
2832 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2833 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2834 &vxlan->default_dst.remote_ip,
2835 NUD_REACHABLE|NUD_PERMANENT,
2836 NLM_F_EXCL|NLM_F_CREATE,
2837 vxlan->cfg.dst_port,
2838 vxlan->default_dst.remote_vni,
2839 vxlan->default_dst.remote_ifindex,
2840 NTF_SELF);
2841 if (err)
2842 return err;
2843 }
2844
2845 err = register_netdevice(dev);
2846 if (err) {
2847 vxlan_fdb_delete_default(vxlan);
2848 return err;
2849 }
2850
2851 list_add(&vxlan->next, &vn->vxlan_list);
2852
2853 return 0;
2854 }
2855
2856 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2857 u8 name_assign_type, struct vxlan_config *conf)
2858 {
2859 struct nlattr *tb[IFLA_MAX+1];
2860 struct net_device *dev;
2861 int err;
2862
2863 memset(&tb, 0, sizeof(tb));
2864
2865 dev = rtnl_create_link(net, name, name_assign_type,
2866 &vxlan_link_ops, tb);
2867 if (IS_ERR(dev))
2868 return dev;
2869
2870 err = vxlan_dev_configure(net, dev, conf);
2871 if (err < 0) {
2872 free_netdev(dev);
2873 return ERR_PTR(err);
2874 }
2875
2876 return dev;
2877 }
2878 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2879
2880 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2881 struct nlattr *tb[], struct nlattr *data[])
2882 {
2883 struct vxlan_config conf;
2884 int err;
2885
2886 memset(&conf, 0, sizeof(conf));
2887
2888 if (data[IFLA_VXLAN_ID])
2889 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2890
2891 if (data[IFLA_VXLAN_GROUP]) {
2892 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2893 } else if (data[IFLA_VXLAN_GROUP6]) {
2894 if (!IS_ENABLED(CONFIG_IPV6))
2895 return -EPFNOSUPPORT;
2896
2897 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2898 conf.remote_ip.sa.sa_family = AF_INET6;
2899 }
2900
2901 if (data[IFLA_VXLAN_LOCAL]) {
2902 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2903 conf.saddr.sa.sa_family = AF_INET;
2904 } else if (data[IFLA_VXLAN_LOCAL6]) {
2905 if (!IS_ENABLED(CONFIG_IPV6))
2906 return -EPFNOSUPPORT;
2907
2908 /* TODO: respect scope id */
2909 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2910 conf.saddr.sa.sa_family = AF_INET6;
2911 }
2912
2913 if (data[IFLA_VXLAN_LINK])
2914 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2915
2916 if (data[IFLA_VXLAN_TOS])
2917 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2918
2919 if (data[IFLA_VXLAN_TTL])
2920 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2921
2922 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2923 conf.flags |= VXLAN_F_LEARN;
2924
2925 if (data[IFLA_VXLAN_AGEING])
2926 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2927
2928 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2929 conf.flags |= VXLAN_F_PROXY;
2930
2931 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2932 conf.flags |= VXLAN_F_RSC;
2933
2934 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2935 conf.flags |= VXLAN_F_L2MISS;
2936
2937 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2938 conf.flags |= VXLAN_F_L3MISS;
2939
2940 if (data[IFLA_VXLAN_LIMIT])
2941 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2942
2943 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2944 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2945 conf.flags |= VXLAN_F_COLLECT_METADATA;
2946
2947 if (data[IFLA_VXLAN_PORT_RANGE]) {
2948 const struct ifla_vxlan_port_range *p
2949 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2950 conf.port_min = ntohs(p->low);
2951 conf.port_max = ntohs(p->high);
2952 }
2953
2954 if (data[IFLA_VXLAN_PORT])
2955 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2956
2957 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2958 conf.flags |= VXLAN_F_UDP_CSUM;
2959
2960 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2961 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2962 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2963
2964 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2965 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2966 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2967
2968 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2969 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2970 conf.flags |= VXLAN_F_REMCSUM_TX;
2971
2972 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2973 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2974 conf.flags |= VXLAN_F_REMCSUM_RX;
2975
2976 if (data[IFLA_VXLAN_GBP])
2977 conf.flags |= VXLAN_F_GBP;
2978
2979 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2980 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2981
2982 err = vxlan_dev_configure(src_net, dev, &conf);
2983 switch (err) {
2984 case -ENODEV:
2985 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2986 break;
2987
2988 case -EPERM:
2989 pr_info("IPv6 is disabled via sysctl\n");
2990 break;
2991
2992 case -EEXIST:
2993 pr_info("duplicate VNI %u\n", conf.vni);
2994 break;
2995 }
2996
2997 return err;
2998 }
2999
3000 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3001 {
3002 struct vxlan_dev *vxlan = netdev_priv(dev);
3003 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3004
3005 spin_lock(&vn->sock_lock);
3006 if (!hlist_unhashed(&vxlan->hlist))
3007 hlist_del_rcu(&vxlan->hlist);
3008 spin_unlock(&vn->sock_lock);
3009
3010 gro_cells_destroy(&vxlan->gro_cells);
3011 list_del(&vxlan->next);
3012 unregister_netdevice_queue(dev, head);
3013 }
3014
3015 static size_t vxlan_get_size(const struct net_device *dev)
3016 {
3017
3018 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3019 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3020 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3021 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3022 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3023 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3024 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3025 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3026 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3027 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3028 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3029 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3030 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3031 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3032 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3033 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3034 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3035 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3036 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3037 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3038 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3039 0;
3040 }
3041
3042 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3043 {
3044 const struct vxlan_dev *vxlan = netdev_priv(dev);
3045 const struct vxlan_rdst *dst = &vxlan->default_dst;
3046 struct ifla_vxlan_port_range ports = {
3047 .low = htons(vxlan->cfg.port_min),
3048 .high = htons(vxlan->cfg.port_max),
3049 };
3050
3051 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3052 goto nla_put_failure;
3053
3054 if (!vxlan_addr_any(&dst->remote_ip)) {
3055 if (dst->remote_ip.sa.sa_family == AF_INET) {
3056 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3057 dst->remote_ip.sin.sin_addr.s_addr))
3058 goto nla_put_failure;
3059 #if IS_ENABLED(CONFIG_IPV6)
3060 } else {
3061 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3062 &dst->remote_ip.sin6.sin6_addr))
3063 goto nla_put_failure;
3064 #endif
3065 }
3066 }
3067
3068 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3069 goto nla_put_failure;
3070
3071 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3072 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3073 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3074 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3075 goto nla_put_failure;
3076 #if IS_ENABLED(CONFIG_IPV6)
3077 } else {
3078 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3079 &vxlan->cfg.saddr.sin6.sin6_addr))
3080 goto nla_put_failure;
3081 #endif
3082 }
3083 }
3084
3085 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3086 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3087 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3088 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3089 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3090 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3091 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3092 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3093 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3094 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3095 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3096 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3097 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3098 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3099 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3100 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3101 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3102 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3103 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3104 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3105 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3106 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3107 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3108 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3109 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3110 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3111 goto nla_put_failure;
3112
3113 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3114 goto nla_put_failure;
3115
3116 if (vxlan->flags & VXLAN_F_GBP &&
3117 nla_put_flag(skb, IFLA_VXLAN_GBP))
3118 goto nla_put_failure;
3119
3120 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3121 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3122 goto nla_put_failure;
3123
3124 return 0;
3125
3126 nla_put_failure:
3127 return -EMSGSIZE;
3128 }
3129
3130 static struct net *vxlan_get_link_net(const struct net_device *dev)
3131 {
3132 struct vxlan_dev *vxlan = netdev_priv(dev);
3133
3134 return vxlan->net;
3135 }
3136
3137 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3138 .kind = "vxlan",
3139 .maxtype = IFLA_VXLAN_MAX,
3140 .policy = vxlan_policy,
3141 .priv_size = sizeof(struct vxlan_dev),
3142 .setup = vxlan_setup,
3143 .validate = vxlan_validate,
3144 .newlink = vxlan_newlink,
3145 .dellink = vxlan_dellink,
3146 .get_size = vxlan_get_size,
3147 .fill_info = vxlan_fill_info,
3148 .get_link_net = vxlan_get_link_net,
3149 };
3150
3151 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3152 struct net_device *dev)
3153 {
3154 struct vxlan_dev *vxlan, *next;
3155 LIST_HEAD(list_kill);
3156
3157 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3158 struct vxlan_rdst *dst = &vxlan->default_dst;
3159
3160 /* In case we created vxlan device with carrier
3161 * and we loose the carrier due to module unload
3162 * we also need to remove vxlan device. In other
3163 * cases, it's not necessary and remote_ifindex
3164 * is 0 here, so no matches.
3165 */
3166 if (dst->remote_ifindex == dev->ifindex)
3167 vxlan_dellink(vxlan->dev, &list_kill);
3168 }
3169
3170 unregister_netdevice_many(&list_kill);
3171 }
3172
3173 static int vxlan_lowerdev_event(struct notifier_block *unused,
3174 unsigned long event, void *ptr)
3175 {
3176 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3177 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3178
3179 if (event == NETDEV_UNREGISTER)
3180 vxlan_handle_lowerdev_unregister(vn, dev);
3181
3182 return NOTIFY_DONE;
3183 }
3184
3185 static struct notifier_block vxlan_notifier_block __read_mostly = {
3186 .notifier_call = vxlan_lowerdev_event,
3187 };
3188
3189 static __net_init int vxlan_init_net(struct net *net)
3190 {
3191 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3192 unsigned int h;
3193
3194 INIT_LIST_HEAD(&vn->vxlan_list);
3195 spin_lock_init(&vn->sock_lock);
3196
3197 for (h = 0; h < PORT_HASH_SIZE; ++h)
3198 INIT_HLIST_HEAD(&vn->sock_list[h]);
3199
3200 return 0;
3201 }
3202
3203 static void __net_exit vxlan_exit_net(struct net *net)
3204 {
3205 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3206 struct vxlan_dev *vxlan, *next;
3207 struct net_device *dev, *aux;
3208 LIST_HEAD(list);
3209
3210 rtnl_lock();
3211 for_each_netdev_safe(net, dev, aux)
3212 if (dev->rtnl_link_ops == &vxlan_link_ops)
3213 unregister_netdevice_queue(dev, &list);
3214
3215 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3216 /* If vxlan->dev is in the same netns, it has already been added
3217 * to the list by the previous loop.
3218 */
3219 if (!net_eq(dev_net(vxlan->dev), net)) {
3220 gro_cells_destroy(&vxlan->gro_cells);
3221 unregister_netdevice_queue(vxlan->dev, &list);
3222 }
3223 }
3224
3225 unregister_netdevice_many(&list);
3226 rtnl_unlock();
3227 }
3228
3229 static struct pernet_operations vxlan_net_ops = {
3230 .init = vxlan_init_net,
3231 .exit = vxlan_exit_net,
3232 .id = &vxlan_net_id,
3233 .size = sizeof(struct vxlan_net),
3234 };
3235
3236 static int __init vxlan_init_module(void)
3237 {
3238 int rc;
3239
3240 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3241 if (!vxlan_wq)
3242 return -ENOMEM;
3243
3244 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3245
3246 rc = register_pernet_subsys(&vxlan_net_ops);
3247 if (rc)
3248 goto out1;
3249
3250 rc = register_netdevice_notifier(&vxlan_notifier_block);
3251 if (rc)
3252 goto out2;
3253
3254 rc = rtnl_link_register(&vxlan_link_ops);
3255 if (rc)
3256 goto out3;
3257
3258 return 0;
3259 out3:
3260 unregister_netdevice_notifier(&vxlan_notifier_block);
3261 out2:
3262 unregister_pernet_subsys(&vxlan_net_ops);
3263 out1:
3264 destroy_workqueue(vxlan_wq);
3265 return rc;
3266 }
3267 late_initcall(vxlan_init_module);
3268
3269 static void __exit vxlan_cleanup_module(void)
3270 {
3271 rtnl_link_unregister(&vxlan_link_ops);
3272 unregister_netdevice_notifier(&vxlan_notifier_block);
3273 destroy_workqueue(vxlan_wq);
3274 unregister_pernet_subsys(&vxlan_net_ops);
3275 /* rcu_barrier() is called by netns */
3276 }
3277 module_exit(vxlan_cleanup_module);
3278
3279 MODULE_LICENSE("GPL");
3280 MODULE_VERSION(VXLAN_VERSION);
3281 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3282 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3283 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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