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Merge branches 'acpi-processor' and 'acpi-cppc'
[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 + 2];
77
78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
79
80 /* per-network namespace private data for this module */
81 struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
84 spinlock_t sock_lock;
85 };
86
87 /* Forwarding table entry */
88 struct vxlan_fdb {
89 struct hlist_node hlist; /* linked list of entries */
90 struct rcu_head rcu;
91 unsigned long updated; /* jiffies */
92 unsigned long used;
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
97 };
98
99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101 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 cb->args[1] = err;
936 goto out;
937 }
938 skip:
939 ++idx;
940 }
941 }
942 }
943 out:
944 return idx;
945 }
946
947 /* Watch incoming packets to learn mapping between Ethernet address
948 * and Tunnel endpoint.
949 * Return true if packet is bogus and should be dropped.
950 */
951 static bool vxlan_snoop(struct net_device *dev,
952 union vxlan_addr *src_ip, const u8 *src_mac)
953 {
954 struct vxlan_dev *vxlan = netdev_priv(dev);
955 struct vxlan_fdb *f;
956
957 f = vxlan_find_mac(vxlan, src_mac);
958 if (likely(f)) {
959 struct vxlan_rdst *rdst = first_remote_rcu(f);
960
961 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
962 return false;
963
964 /* Don't migrate static entries, drop packets */
965 if (f->state & NUD_NOARP)
966 return true;
967
968 if (net_ratelimit())
969 netdev_info(dev,
970 "%pM migrated from %pIS to %pIS\n",
971 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
972
973 rdst->remote_ip = *src_ip;
974 f->updated = jiffies;
975 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
976 } else {
977 /* learned new entry */
978 spin_lock(&vxlan->hash_lock);
979
980 /* close off race between vxlan_flush and incoming packets */
981 if (netif_running(dev))
982 vxlan_fdb_create(vxlan, src_mac, src_ip,
983 NUD_REACHABLE,
984 NLM_F_EXCL|NLM_F_CREATE,
985 vxlan->cfg.dst_port,
986 vxlan->default_dst.remote_vni,
987 0, NTF_SELF);
988 spin_unlock(&vxlan->hash_lock);
989 }
990
991 return false;
992 }
993
994 /* See if multicast group is already in use by other ID */
995 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
996 {
997 struct vxlan_dev *vxlan;
998 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
999
1000 /* The vxlan_sock is only used by dev, leaving group has
1001 * no effect on other vxlan devices.
1002 */
1003 if (family == AF_INET && dev->vn4_sock &&
1004 atomic_read(&dev->vn4_sock->refcnt) == 1)
1005 return false;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007 if (family == AF_INET6 && dev->vn6_sock &&
1008 atomic_read(&dev->vn6_sock->refcnt) == 1)
1009 return false;
1010 #endif
1011
1012 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1013 if (!netif_running(vxlan->dev) || vxlan == dev)
1014 continue;
1015
1016 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1017 continue;
1018 #if IS_ENABLED(CONFIG_IPV6)
1019 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1020 continue;
1021 #endif
1022
1023 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1024 &dev->default_dst.remote_ip))
1025 continue;
1026
1027 if (vxlan->default_dst.remote_ifindex !=
1028 dev->default_dst.remote_ifindex)
1029 continue;
1030
1031 return true;
1032 }
1033
1034 return false;
1035 }
1036
1037 static void __vxlan_sock_release(struct vxlan_sock *vs)
1038 {
1039 struct vxlan_net *vn;
1040
1041 if (!vs)
1042 return;
1043 if (!atomic_dec_and_test(&vs->refcnt))
1044 return;
1045
1046 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1047 spin_lock(&vn->sock_lock);
1048 hlist_del_rcu(&vs->hlist);
1049 vxlan_notify_del_rx_port(vs);
1050 spin_unlock(&vn->sock_lock);
1051
1052 queue_work(vxlan_wq, &vs->del_work);
1053 }
1054
1055 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1056 {
1057 __vxlan_sock_release(vxlan->vn4_sock);
1058 #if IS_ENABLED(CONFIG_IPV6)
1059 __vxlan_sock_release(vxlan->vn6_sock);
1060 #endif
1061 }
1062
1063 /* Update multicast group membership when first VNI on
1064 * multicast address is brought up
1065 */
1066 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1067 {
1068 struct sock *sk;
1069 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1070 int ifindex = vxlan->default_dst.remote_ifindex;
1071 int ret = -EINVAL;
1072
1073 if (ip->sa.sa_family == AF_INET) {
1074 struct ip_mreqn mreq = {
1075 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1076 .imr_ifindex = ifindex,
1077 };
1078
1079 sk = vxlan->vn4_sock->sock->sk;
1080 lock_sock(sk);
1081 ret = ip_mc_join_group(sk, &mreq);
1082 release_sock(sk);
1083 #if IS_ENABLED(CONFIG_IPV6)
1084 } else {
1085 sk = vxlan->vn6_sock->sock->sk;
1086 lock_sock(sk);
1087 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1088 &ip->sin6.sin6_addr);
1089 release_sock(sk);
1090 #endif
1091 }
1092
1093 return ret;
1094 }
1095
1096 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1097 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1098 {
1099 struct sock *sk;
1100 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1101 int ifindex = vxlan->default_dst.remote_ifindex;
1102 int ret = -EINVAL;
1103
1104 if (ip->sa.sa_family == AF_INET) {
1105 struct ip_mreqn mreq = {
1106 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1107 .imr_ifindex = ifindex,
1108 };
1109
1110 sk = vxlan->vn4_sock->sock->sk;
1111 lock_sock(sk);
1112 ret = ip_mc_leave_group(sk, &mreq);
1113 release_sock(sk);
1114 #if IS_ENABLED(CONFIG_IPV6)
1115 } else {
1116 sk = vxlan->vn6_sock->sock->sk;
1117 lock_sock(sk);
1118 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1119 &ip->sin6.sin6_addr);
1120 release_sock(sk);
1121 #endif
1122 }
1123
1124 return ret;
1125 }
1126
1127 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1128 size_t hdrlen, u32 data, bool nopartial)
1129 {
1130 size_t start, offset, plen;
1131
1132 if (skb->remcsum_offload)
1133 return vh;
1134
1135 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1136 offset = start + ((data & VXLAN_RCO_UDP) ?
1137 offsetof(struct udphdr, check) :
1138 offsetof(struct tcphdr, check));
1139
1140 plen = hdrlen + offset + sizeof(u16);
1141
1142 if (!pskb_may_pull(skb, plen))
1143 return NULL;
1144
1145 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1146
1147 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1148 nopartial);
1149
1150 return vh;
1151 }
1152
1153 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1154 struct vxlan_metadata *md, u32 vni,
1155 struct metadata_dst *tun_dst)
1156 {
1157 struct iphdr *oip = NULL;
1158 struct ipv6hdr *oip6 = NULL;
1159 struct vxlan_dev *vxlan;
1160 struct pcpu_sw_netstats *stats;
1161 union vxlan_addr saddr;
1162 int err = 0;
1163
1164 /* For flow based devices, map all packets to VNI 0 */
1165 if (vs->flags & VXLAN_F_COLLECT_METADATA)
1166 vni = 0;
1167
1168 /* Is this VNI defined? */
1169 vxlan = vxlan_vs_find_vni(vs, vni);
1170 if (!vxlan)
1171 goto drop;
1172
1173 skb_reset_mac_header(skb);
1174 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1175 skb->protocol = eth_type_trans(skb, vxlan->dev);
1176 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1177
1178 /* Ignore packet loops (and multicast echo) */
1179 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1180 goto drop;
1181
1182 /* Get data from the outer IP header */
1183 if (vxlan_get_sk_family(vs) == AF_INET) {
1184 oip = ip_hdr(skb);
1185 saddr.sin.sin_addr.s_addr = oip->saddr;
1186 saddr.sa.sa_family = AF_INET;
1187 #if IS_ENABLED(CONFIG_IPV6)
1188 } else {
1189 oip6 = ipv6_hdr(skb);
1190 saddr.sin6.sin6_addr = oip6->saddr;
1191 saddr.sa.sa_family = AF_INET6;
1192 #endif
1193 }
1194
1195 if (tun_dst) {
1196 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1197 tun_dst = NULL;
1198 }
1199
1200 if ((vxlan->flags & VXLAN_F_LEARN) &&
1201 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1202 goto drop;
1203
1204 skb_reset_network_header(skb);
1205 /* In flow-based mode, GBP is carried in dst_metadata */
1206 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1207 skb->mark = md->gbp;
1208
1209 if (oip6)
1210 err = IP6_ECN_decapsulate(oip6, skb);
1211 if (oip)
1212 err = IP_ECN_decapsulate(oip, skb);
1213
1214 if (unlikely(err)) {
1215 if (log_ecn_error) {
1216 if (oip6)
1217 net_info_ratelimited("non-ECT from %pI6\n",
1218 &oip6->saddr);
1219 if (oip)
1220 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1221 &oip->saddr, oip->tos);
1222 }
1223 if (err > 1) {
1224 ++vxlan->dev->stats.rx_frame_errors;
1225 ++vxlan->dev->stats.rx_errors;
1226 goto drop;
1227 }
1228 }
1229
1230 stats = this_cpu_ptr(vxlan->dev->tstats);
1231 u64_stats_update_begin(&stats->syncp);
1232 stats->rx_packets++;
1233 stats->rx_bytes += skb->len;
1234 u64_stats_update_end(&stats->syncp);
1235
1236 gro_cells_receive(&vxlan->gro_cells, skb);
1237
1238 return;
1239 drop:
1240 if (tun_dst)
1241 dst_release((struct dst_entry *)tun_dst);
1242
1243 /* Consume bad packet */
1244 kfree_skb(skb);
1245 }
1246
1247 /* Callback from net/ipv4/udp.c to receive packets */
1248 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1249 {
1250 struct metadata_dst *tun_dst = NULL;
1251 struct vxlan_sock *vs;
1252 struct vxlanhdr *vxh;
1253 u32 flags, vni;
1254 struct vxlan_metadata _md;
1255 struct vxlan_metadata *md = &_md;
1256
1257 /* Need Vxlan and inner Ethernet header to be present */
1258 if (!pskb_may_pull(skb, VXLAN_HLEN))
1259 goto error;
1260
1261 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1262 flags = ntohl(vxh->vx_flags);
1263 vni = ntohl(vxh->vx_vni);
1264
1265 if (flags & VXLAN_HF_VNI) {
1266 flags &= ~VXLAN_HF_VNI;
1267 } else {
1268 /* VNI flag always required to be set */
1269 goto bad_flags;
1270 }
1271
1272 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1273 goto drop;
1274 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1275
1276 vs = rcu_dereference_sk_user_data(sk);
1277 if (!vs)
1278 goto drop;
1279
1280 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1281 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1282 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1283 if (!vxh)
1284 goto drop;
1285
1286 flags &= ~VXLAN_HF_RCO;
1287 vni &= VXLAN_VNI_MASK;
1288 }
1289
1290 if (vxlan_collect_metadata(vs)) {
1291 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1292 cpu_to_be64(vni >> 8), sizeof(*md));
1293
1294 if (!tun_dst)
1295 goto drop;
1296
1297 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1298 } else {
1299 memset(md, 0, sizeof(*md));
1300 }
1301
1302 /* For backwards compatibility, only allow reserved fields to be
1303 * used by VXLAN extensions if explicitly requested.
1304 */
1305 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1306 struct vxlanhdr_gbp *gbp;
1307
1308 gbp = (struct vxlanhdr_gbp *)vxh;
1309 md->gbp = ntohs(gbp->policy_id);
1310
1311 if (tun_dst) {
1312 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1313 tun_dst->u.tun_info.options_len = sizeof(*md);
1314 }
1315
1316 if (gbp->dont_learn)
1317 md->gbp |= VXLAN_GBP_DONT_LEARN;
1318
1319 if (gbp->policy_applied)
1320 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1321
1322 flags &= ~VXLAN_GBP_USED_BITS;
1323 }
1324
1325 if (flags || vni & ~VXLAN_VNI_MASK) {
1326 /* If there are any unprocessed flags remaining treat
1327 * this as a malformed packet. This behavior diverges from
1328 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1329 * in reserved fields are to be ignored. The approach here
1330 * maintains compatibility with previous stack code, and also
1331 * is more robust and provides a little more security in
1332 * adding extensions to VXLAN.
1333 */
1334
1335 goto bad_flags;
1336 }
1337
1338 vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1339 return 0;
1340
1341 drop:
1342 /* Consume bad packet */
1343 kfree_skb(skb);
1344 return 0;
1345
1346 bad_flags:
1347 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1348 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1349
1350 error:
1351 if (tun_dst)
1352 dst_release((struct dst_entry *)tun_dst);
1353
1354 /* Return non vxlan pkt */
1355 return 1;
1356 }
1357
1358 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359 {
1360 struct vxlan_dev *vxlan = netdev_priv(dev);
1361 struct arphdr *parp;
1362 u8 *arpptr, *sha;
1363 __be32 sip, tip;
1364 struct neighbour *n;
1365
1366 if (dev->flags & IFF_NOARP)
1367 goto out;
1368
1369 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370 dev->stats.tx_dropped++;
1371 goto out;
1372 }
1373 parp = arp_hdr(skb);
1374
1375 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377 parp->ar_pro != htons(ETH_P_IP) ||
1378 parp->ar_op != htons(ARPOP_REQUEST) ||
1379 parp->ar_hln != dev->addr_len ||
1380 parp->ar_pln != 4)
1381 goto out;
1382 arpptr = (u8 *)parp + sizeof(struct arphdr);
1383 sha = arpptr;
1384 arpptr += dev->addr_len; /* sha */
1385 memcpy(&sip, arpptr, sizeof(sip));
1386 arpptr += sizeof(sip);
1387 arpptr += dev->addr_len; /* tha */
1388 memcpy(&tip, arpptr, sizeof(tip));
1389
1390 if (ipv4_is_loopback(tip) ||
1391 ipv4_is_multicast(tip))
1392 goto out;
1393
1394 n = neigh_lookup(&arp_tbl, &tip, dev);
1395
1396 if (n) {
1397 struct vxlan_fdb *f;
1398 struct sk_buff *reply;
1399
1400 if (!(n->nud_state & NUD_CONNECTED)) {
1401 neigh_release(n);
1402 goto out;
1403 }
1404
1405 f = vxlan_find_mac(vxlan, n->ha);
1406 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1407 /* bridge-local neighbor */
1408 neigh_release(n);
1409 goto out;
1410 }
1411
1412 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413 n->ha, sha);
1414
1415 neigh_release(n);
1416
1417 if (reply == NULL)
1418 goto out;
1419
1420 skb_reset_mac_header(reply);
1421 __skb_pull(reply, skb_network_offset(reply));
1422 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423 reply->pkt_type = PACKET_HOST;
1424
1425 if (netif_rx_ni(reply) == NET_RX_DROP)
1426 dev->stats.rx_dropped++;
1427 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428 union vxlan_addr ipa = {
1429 .sin.sin_addr.s_addr = tip,
1430 .sin.sin_family = AF_INET,
1431 };
1432
1433 vxlan_ip_miss(dev, &ipa);
1434 }
1435 out:
1436 consume_skb(skb);
1437 return NETDEV_TX_OK;
1438 }
1439
1440 #if IS_ENABLED(CONFIG_IPV6)
1441 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442 struct neighbour *n, bool isrouter)
1443 {
1444 struct net_device *dev = request->dev;
1445 struct sk_buff *reply;
1446 struct nd_msg *ns, *na;
1447 struct ipv6hdr *pip6;
1448 u8 *daddr;
1449 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450 int ns_olen;
1451 int i, len;
1452
1453 if (dev == NULL)
1454 return NULL;
1455
1456 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457 sizeof(*na) + na_olen + dev->needed_tailroom;
1458 reply = alloc_skb(len, GFP_ATOMIC);
1459 if (reply == NULL)
1460 return NULL;
1461
1462 reply->protocol = htons(ETH_P_IPV6);
1463 reply->dev = dev;
1464 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465 skb_push(reply, sizeof(struct ethhdr));
1466 skb_set_mac_header(reply, 0);
1467
1468 ns = (struct nd_msg *)skb_transport_header(request);
1469
1470 daddr = eth_hdr(request)->h_source;
1471 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475 break;
1476 }
1477 }
1478
1479 /* Ethernet header */
1480 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483 reply->protocol = htons(ETH_P_IPV6);
1484
1485 skb_pull(reply, sizeof(struct ethhdr));
1486 skb_set_network_header(reply, 0);
1487 skb_put(reply, sizeof(struct ipv6hdr));
1488
1489 /* IPv6 header */
1490
1491 pip6 = ipv6_hdr(reply);
1492 memset(pip6, 0, sizeof(struct ipv6hdr));
1493 pip6->version = 6;
1494 pip6->priority = ipv6_hdr(request)->priority;
1495 pip6->nexthdr = IPPROTO_ICMPV6;
1496 pip6->hop_limit = 255;
1497 pip6->daddr = ipv6_hdr(request)->saddr;
1498 pip6->saddr = *(struct in6_addr *)n->primary_key;
1499
1500 skb_pull(reply, sizeof(struct ipv6hdr));
1501 skb_set_transport_header(reply, 0);
1502
1503 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504
1505 /* Neighbor Advertisement */
1506 memset(na, 0, sizeof(*na)+na_olen);
1507 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508 na->icmph.icmp6_router = isrouter;
1509 na->icmph.icmp6_override = 1;
1510 na->icmph.icmp6_solicited = 1;
1511 na->target = ns->target;
1512 ether_addr_copy(&na->opt[2], n->ha);
1513 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514 na->opt[1] = na_olen >> 3;
1515
1516 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518 csum_partial(na, sizeof(*na)+na_olen, 0));
1519
1520 pip6->payload_len = htons(sizeof(*na)+na_olen);
1521
1522 skb_push(reply, sizeof(struct ipv6hdr));
1523
1524 reply->ip_summed = CHECKSUM_UNNECESSARY;
1525
1526 return reply;
1527 }
1528
1529 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530 {
1531 struct vxlan_dev *vxlan = netdev_priv(dev);
1532 struct nd_msg *msg;
1533 const struct ipv6hdr *iphdr;
1534 const struct in6_addr *saddr, *daddr;
1535 struct neighbour *n;
1536 struct inet6_dev *in6_dev;
1537
1538 in6_dev = __in6_dev_get(dev);
1539 if (!in6_dev)
1540 goto out;
1541
1542 iphdr = ipv6_hdr(skb);
1543 saddr = &iphdr->saddr;
1544 daddr = &iphdr->daddr;
1545
1546 msg = (struct nd_msg *)skb_transport_header(skb);
1547 if (msg->icmph.icmp6_code != 0 ||
1548 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549 goto out;
1550
1551 if (ipv6_addr_loopback(daddr) ||
1552 ipv6_addr_is_multicast(&msg->target))
1553 goto out;
1554
1555 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1556
1557 if (n) {
1558 struct vxlan_fdb *f;
1559 struct sk_buff *reply;
1560
1561 if (!(n->nud_state & NUD_CONNECTED)) {
1562 neigh_release(n);
1563 goto out;
1564 }
1565
1566 f = vxlan_find_mac(vxlan, n->ha);
1567 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568 /* bridge-local neighbor */
1569 neigh_release(n);
1570 goto out;
1571 }
1572
1573 reply = vxlan_na_create(skb, n,
1574 !!(f ? f->flags & NTF_ROUTER : 0));
1575
1576 neigh_release(n);
1577
1578 if (reply == NULL)
1579 goto out;
1580
1581 if (netif_rx_ni(reply) == NET_RX_DROP)
1582 dev->stats.rx_dropped++;
1583
1584 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1585 union vxlan_addr ipa = {
1586 .sin6.sin6_addr = msg->target,
1587 .sin6.sin6_family = AF_INET6,
1588 };
1589
1590 vxlan_ip_miss(dev, &ipa);
1591 }
1592
1593 out:
1594 consume_skb(skb);
1595 return NETDEV_TX_OK;
1596 }
1597 #endif
1598
1599 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600 {
1601 struct vxlan_dev *vxlan = netdev_priv(dev);
1602 struct neighbour *n;
1603
1604 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605 return false;
1606
1607 n = NULL;
1608 switch (ntohs(eth_hdr(skb)->h_proto)) {
1609 case ETH_P_IP:
1610 {
1611 struct iphdr *pip;
1612
1613 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614 return false;
1615 pip = ip_hdr(skb);
1616 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1617 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618 union vxlan_addr ipa = {
1619 .sin.sin_addr.s_addr = pip->daddr,
1620 .sin.sin_family = AF_INET,
1621 };
1622
1623 vxlan_ip_miss(dev, &ipa);
1624 return false;
1625 }
1626
1627 break;
1628 }
1629 #if IS_ENABLED(CONFIG_IPV6)
1630 case ETH_P_IPV6:
1631 {
1632 struct ipv6hdr *pip6;
1633
1634 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635 return false;
1636 pip6 = ipv6_hdr(skb);
1637 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639 union vxlan_addr ipa = {
1640 .sin6.sin6_addr = pip6->daddr,
1641 .sin6.sin6_family = AF_INET6,
1642 };
1643
1644 vxlan_ip_miss(dev, &ipa);
1645 return false;
1646 }
1647
1648 break;
1649 }
1650 #endif
1651 default:
1652 return false;
1653 }
1654
1655 if (n) {
1656 bool diff;
1657
1658 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1659 if (diff) {
1660 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661 dev->addr_len);
1662 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663 }
1664 neigh_release(n);
1665 return diff;
1666 }
1667
1668 return false;
1669 }
1670
1671 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1672 struct vxlan_metadata *md)
1673 {
1674 struct vxlanhdr_gbp *gbp;
1675
1676 if (!md->gbp)
1677 return;
1678
1679 gbp = (struct vxlanhdr_gbp *)vxh;
1680 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1681
1682 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683 gbp->dont_learn = 1;
1684
1685 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686 gbp->policy_applied = 1;
1687
1688 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 }
1690
1691 #if IS_ENABLED(CONFIG_IPV6)
1692 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1693 struct sk_buff *skb,
1694 struct net_device *dev, struct in6_addr *saddr,
1695 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1696 __be16 src_port, __be16 dst_port, __be32 vni,
1697 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1698 {
1699 struct vxlanhdr *vxh;
1700 int min_headroom;
1701 int err;
1702 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1703 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1704 u16 hdrlen = sizeof(struct vxlanhdr);
1705
1706 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1707 skb->ip_summed == CHECKSUM_PARTIAL) {
1708 int csum_start = skb_checksum_start_offset(skb);
1709
1710 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1711 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1712 (skb->csum_offset == offsetof(struct udphdr, check) ||
1713 skb->csum_offset == offsetof(struct tcphdr, check))) {
1714 udp_sum = false;
1715 type |= SKB_GSO_TUNNEL_REMCSUM;
1716 }
1717 }
1718
1719 skb_scrub_packet(skb, xnet);
1720
1721 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1722 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1723 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1724
1725 /* Need space for new headers (invalidates iph ptr) */
1726 err = skb_cow_head(skb, min_headroom);
1727 if (unlikely(err)) {
1728 kfree_skb(skb);
1729 goto err;
1730 }
1731
1732 skb = vlan_hwaccel_push_inside(skb);
1733 if (WARN_ON(!skb)) {
1734 err = -ENOMEM;
1735 goto err;
1736 }
1737
1738 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1739 if (IS_ERR(skb)) {
1740 err = -EINVAL;
1741 goto err;
1742 }
1743
1744 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1745 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1746 vxh->vx_vni = vni;
1747
1748 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1749 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1750 VXLAN_RCO_SHIFT;
1751
1752 if (skb->csum_offset == offsetof(struct udphdr, check))
1753 data |= VXLAN_RCO_UDP;
1754
1755 vxh->vx_vni |= htonl(data);
1756 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1757
1758 if (!skb_is_gso(skb)) {
1759 skb->ip_summed = CHECKSUM_NONE;
1760 skb->encapsulation = 0;
1761 }
1762 }
1763
1764 if (vxflags & VXLAN_F_GBP)
1765 vxlan_build_gbp_hdr(vxh, vxflags, md);
1766
1767 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1768
1769 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1770 ttl, src_port, dst_port,
1771 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1772 return 0;
1773 err:
1774 dst_release(dst);
1775 return err;
1776 }
1777 #endif
1778
1779 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1780 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1781 __be16 src_port, __be16 dst_port, __be32 vni,
1782 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1783 {
1784 struct vxlanhdr *vxh;
1785 int min_headroom;
1786 int err;
1787 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1788 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1789 u16 hdrlen = sizeof(struct vxlanhdr);
1790
1791 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1792 skb->ip_summed == CHECKSUM_PARTIAL) {
1793 int csum_start = skb_checksum_start_offset(skb);
1794
1795 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1796 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1797 (skb->csum_offset == offsetof(struct udphdr, check) ||
1798 skb->csum_offset == offsetof(struct tcphdr, check))) {
1799 udp_sum = false;
1800 type |= SKB_GSO_TUNNEL_REMCSUM;
1801 }
1802 }
1803
1804 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1805 + VXLAN_HLEN + sizeof(struct iphdr)
1806 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1807
1808 /* Need space for new headers (invalidates iph ptr) */
1809 err = skb_cow_head(skb, min_headroom);
1810 if (unlikely(err)) {
1811 kfree_skb(skb);
1812 return err;
1813 }
1814
1815 skb = vlan_hwaccel_push_inside(skb);
1816 if (WARN_ON(!skb))
1817 return -ENOMEM;
1818
1819 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1820 if (IS_ERR(skb))
1821 return PTR_ERR(skb);
1822
1823 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1824 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1825 vxh->vx_vni = vni;
1826
1827 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1828 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1829 VXLAN_RCO_SHIFT;
1830
1831 if (skb->csum_offset == offsetof(struct udphdr, check))
1832 data |= VXLAN_RCO_UDP;
1833
1834 vxh->vx_vni |= htonl(data);
1835 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1836
1837 if (!skb_is_gso(skb)) {
1838 skb->ip_summed = CHECKSUM_NONE;
1839 skb->encapsulation = 0;
1840 }
1841 }
1842
1843 if (vxflags & VXLAN_F_GBP)
1844 vxlan_build_gbp_hdr(vxh, vxflags, md);
1845
1846 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1847
1848 udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,
1849 src_port, dst_port, xnet,
1850 !(vxflags & VXLAN_F_UDP_CSUM));
1851 return 0;
1852 }
1853
1854 #if IS_ENABLED(CONFIG_IPV6)
1855 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1856 struct sk_buff *skb, int oif,
1857 const struct in6_addr *daddr,
1858 struct in6_addr *saddr)
1859 {
1860 struct dst_entry *ndst;
1861 struct flowi6 fl6;
1862 int err;
1863
1864 memset(&fl6, 0, sizeof(fl6));
1865 fl6.flowi6_oif = oif;
1866 fl6.daddr = *daddr;
1867 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1868 fl6.flowi6_mark = skb->mark;
1869 fl6.flowi6_proto = IPPROTO_UDP;
1870
1871 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1872 vxlan->vn6_sock->sock->sk,
1873 &ndst, &fl6);
1874 if (err < 0)
1875 return ERR_PTR(err);
1876
1877 *saddr = fl6.saddr;
1878 return ndst;
1879 }
1880 #endif
1881
1882 /* Bypass encapsulation if the destination is local */
1883 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1884 struct vxlan_dev *dst_vxlan)
1885 {
1886 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1887 union vxlan_addr loopback;
1888 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1889 struct net_device *dev = skb->dev;
1890 int len = skb->len;
1891
1892 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1893 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1894 skb->pkt_type = PACKET_HOST;
1895 skb->encapsulation = 0;
1896 skb->dev = dst_vxlan->dev;
1897 __skb_pull(skb, skb_network_offset(skb));
1898
1899 if (remote_ip->sa.sa_family == AF_INET) {
1900 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1901 loopback.sa.sa_family = AF_INET;
1902 #if IS_ENABLED(CONFIG_IPV6)
1903 } else {
1904 loopback.sin6.sin6_addr = in6addr_loopback;
1905 loopback.sa.sa_family = AF_INET6;
1906 #endif
1907 }
1908
1909 if (dst_vxlan->flags & VXLAN_F_LEARN)
1910 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1911
1912 u64_stats_update_begin(&tx_stats->syncp);
1913 tx_stats->tx_packets++;
1914 tx_stats->tx_bytes += len;
1915 u64_stats_update_end(&tx_stats->syncp);
1916
1917 if (netif_rx(skb) == NET_RX_SUCCESS) {
1918 u64_stats_update_begin(&rx_stats->syncp);
1919 rx_stats->rx_packets++;
1920 rx_stats->rx_bytes += len;
1921 u64_stats_update_end(&rx_stats->syncp);
1922 } else {
1923 dev->stats.rx_dropped++;
1924 }
1925 }
1926
1927 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1928 struct vxlan_rdst *rdst, bool did_rsc)
1929 {
1930 struct ip_tunnel_info *info;
1931 struct vxlan_dev *vxlan = netdev_priv(dev);
1932 struct sock *sk;
1933 struct rtable *rt = NULL;
1934 const struct iphdr *old_iph;
1935 struct flowi4 fl4;
1936 union vxlan_addr *dst;
1937 union vxlan_addr remote_ip;
1938 struct vxlan_metadata _md;
1939 struct vxlan_metadata *md = &_md;
1940 __be16 src_port = 0, dst_port;
1941 u32 vni;
1942 __be16 df = 0;
1943 __u8 tos, ttl;
1944 int err;
1945 u32 flags = vxlan->flags;
1946
1947 info = skb_tunnel_info(skb);
1948
1949 if (rdst) {
1950 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1951 vni = rdst->remote_vni;
1952 dst = &rdst->remote_ip;
1953 } else {
1954 if (!info) {
1955 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1956 dev->name);
1957 goto drop;
1958 }
1959 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1960 vni = be64_to_cpu(info->key.tun_id);
1961 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1962 if (remote_ip.sa.sa_family == AF_INET)
1963 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1964 else
1965 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1966 dst = &remote_ip;
1967 }
1968
1969 if (vxlan_addr_any(dst)) {
1970 if (did_rsc) {
1971 /* short-circuited back to local bridge */
1972 vxlan_encap_bypass(skb, vxlan, vxlan);
1973 return;
1974 }
1975 goto drop;
1976 }
1977
1978 old_iph = ip_hdr(skb);
1979
1980 ttl = vxlan->cfg.ttl;
1981 if (!ttl && vxlan_addr_multicast(dst))
1982 ttl = 1;
1983
1984 tos = vxlan->cfg.tos;
1985 if (tos == 1)
1986 tos = ip_tunnel_get_dsfield(old_iph, skb);
1987
1988 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1989 vxlan->cfg.port_max, true);
1990
1991 if (info) {
1992 ttl = info->key.ttl;
1993 tos = info->key.tos;
1994
1995 if (info->options_len)
1996 md = ip_tunnel_info_opts(info);
1997 } else {
1998 md->gbp = skb->mark;
1999 }
2000
2001 if (dst->sa.sa_family == AF_INET) {
2002 if (!vxlan->vn4_sock)
2003 goto drop;
2004 sk = vxlan->vn4_sock->sock->sk;
2005
2006 if (info) {
2007 if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2008 df = htons(IP_DF);
2009
2010 if (info->key.tun_flags & TUNNEL_CSUM)
2011 flags |= VXLAN_F_UDP_CSUM;
2012 else
2013 flags &= ~VXLAN_F_UDP_CSUM;
2014 }
2015
2016 memset(&fl4, 0, sizeof(fl4));
2017 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
2018 fl4.flowi4_tos = RT_TOS(tos);
2019 fl4.flowi4_mark = skb->mark;
2020 fl4.flowi4_proto = IPPROTO_UDP;
2021 fl4.daddr = dst->sin.sin_addr.s_addr;
2022 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2023
2024 rt = ip_route_output_key(vxlan->net, &fl4);
2025 if (IS_ERR(rt)) {
2026 netdev_dbg(dev, "no route to %pI4\n",
2027 &dst->sin.sin_addr.s_addr);
2028 dev->stats.tx_carrier_errors++;
2029 goto tx_error;
2030 }
2031
2032 if (rt->dst.dev == dev) {
2033 netdev_dbg(dev, "circular route to %pI4\n",
2034 &dst->sin.sin_addr.s_addr);
2035 dev->stats.collisions++;
2036 goto rt_tx_error;
2037 }
2038
2039 /* Bypass encapsulation if the destination is local */
2040 if (rt->rt_flags & RTCF_LOCAL &&
2041 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2042 struct vxlan_dev *dst_vxlan;
2043
2044 ip_rt_put(rt);
2045 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2046 dst->sa.sa_family, dst_port,
2047 vxlan->flags);
2048 if (!dst_vxlan)
2049 goto tx_error;
2050 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2051 return;
2052 }
2053
2054 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2055 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2056 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2057 dst->sin.sin_addr.s_addr, tos, ttl, df,
2058 src_port, dst_port, htonl(vni << 8), md,
2059 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2060 flags);
2061 if (err < 0) {
2062 /* skb is already freed. */
2063 skb = NULL;
2064 goto rt_tx_error;
2065 }
2066 #if IS_ENABLED(CONFIG_IPV6)
2067 } else {
2068 struct dst_entry *ndst;
2069 struct in6_addr saddr;
2070 u32 rt6i_flags;
2071
2072 if (!vxlan->vn6_sock)
2073 goto drop;
2074 sk = vxlan->vn6_sock->sock->sk;
2075
2076 ndst = vxlan6_get_route(vxlan, skb,
2077 rdst ? rdst->remote_ifindex : 0,
2078 &dst->sin6.sin6_addr, &saddr);
2079 if (IS_ERR(ndst)) {
2080 netdev_dbg(dev, "no route to %pI6\n",
2081 &dst->sin6.sin6_addr);
2082 dev->stats.tx_carrier_errors++;
2083 goto tx_error;
2084 }
2085
2086 if (ndst->dev == dev) {
2087 netdev_dbg(dev, "circular route to %pI6\n",
2088 &dst->sin6.sin6_addr);
2089 dst_release(ndst);
2090 dev->stats.collisions++;
2091 goto tx_error;
2092 }
2093
2094 /* Bypass encapsulation if the destination is local */
2095 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2096 if (rt6i_flags & RTF_LOCAL &&
2097 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2098 struct vxlan_dev *dst_vxlan;
2099
2100 dst_release(ndst);
2101 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2102 dst->sa.sa_family, dst_port,
2103 vxlan->flags);
2104 if (!dst_vxlan)
2105 goto tx_error;
2106 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2107 return;
2108 }
2109
2110 if (info) {
2111 if (info->key.tun_flags & TUNNEL_CSUM)
2112 flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
2113 else
2114 flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2115 }
2116
2117 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2118 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2119 0, ttl, src_port, dst_port, htonl(vni << 8), md,
2120 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2121 flags);
2122 #endif
2123 }
2124
2125 return;
2126
2127 drop:
2128 dev->stats.tx_dropped++;
2129 goto tx_free;
2130
2131 rt_tx_error:
2132 ip_rt_put(rt);
2133 tx_error:
2134 dev->stats.tx_errors++;
2135 tx_free:
2136 dev_kfree_skb(skb);
2137 }
2138
2139 /* Transmit local packets over Vxlan
2140 *
2141 * Outer IP header inherits ECN and DF from inner header.
2142 * Outer UDP destination is the VXLAN assigned port.
2143 * source port is based on hash of flow
2144 */
2145 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2146 {
2147 struct vxlan_dev *vxlan = netdev_priv(dev);
2148 const struct ip_tunnel_info *info;
2149 struct ethhdr *eth;
2150 bool did_rsc = false;
2151 struct vxlan_rdst *rdst, *fdst = NULL;
2152 struct vxlan_fdb *f;
2153
2154 info = skb_tunnel_info(skb);
2155
2156 skb_reset_mac_header(skb);
2157 eth = eth_hdr(skb);
2158
2159 if ((vxlan->flags & VXLAN_F_PROXY)) {
2160 if (ntohs(eth->h_proto) == ETH_P_ARP)
2161 return arp_reduce(dev, skb);
2162 #if IS_ENABLED(CONFIG_IPV6)
2163 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2164 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2165 + sizeof(struct nd_msg)) &&
2166 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2167 struct nd_msg *msg;
2168
2169 msg = (struct nd_msg *)skb_transport_header(skb);
2170 if (msg->icmph.icmp6_code == 0 &&
2171 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2172 return neigh_reduce(dev, skb);
2173 }
2174 eth = eth_hdr(skb);
2175 #endif
2176 }
2177
2178 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2179 if (info && info->mode & IP_TUNNEL_INFO_TX)
2180 vxlan_xmit_one(skb, dev, NULL, false);
2181 else
2182 kfree_skb(skb);
2183 return NETDEV_TX_OK;
2184 }
2185
2186 f = vxlan_find_mac(vxlan, eth->h_dest);
2187 did_rsc = false;
2188
2189 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2190 (ntohs(eth->h_proto) == ETH_P_IP ||
2191 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2192 did_rsc = route_shortcircuit(dev, skb);
2193 if (did_rsc)
2194 f = vxlan_find_mac(vxlan, eth->h_dest);
2195 }
2196
2197 if (f == NULL) {
2198 f = vxlan_find_mac(vxlan, all_zeros_mac);
2199 if (f == NULL) {
2200 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2201 !is_multicast_ether_addr(eth->h_dest))
2202 vxlan_fdb_miss(vxlan, eth->h_dest);
2203
2204 dev->stats.tx_dropped++;
2205 kfree_skb(skb);
2206 return NETDEV_TX_OK;
2207 }
2208 }
2209
2210 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2211 struct sk_buff *skb1;
2212
2213 if (!fdst) {
2214 fdst = rdst;
2215 continue;
2216 }
2217 skb1 = skb_clone(skb, GFP_ATOMIC);
2218 if (skb1)
2219 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2220 }
2221
2222 if (fdst)
2223 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2224 else
2225 kfree_skb(skb);
2226 return NETDEV_TX_OK;
2227 }
2228
2229 /* Walk the forwarding table and purge stale entries */
2230 static void vxlan_cleanup(unsigned long arg)
2231 {
2232 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2233 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2234 unsigned int h;
2235
2236 if (!netif_running(vxlan->dev))
2237 return;
2238
2239 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2240 struct hlist_node *p, *n;
2241
2242 spin_lock_bh(&vxlan->hash_lock);
2243 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2244 struct vxlan_fdb *f
2245 = container_of(p, struct vxlan_fdb, hlist);
2246 unsigned long timeout;
2247
2248 if (f->state & NUD_PERMANENT)
2249 continue;
2250
2251 timeout = f->used + vxlan->cfg.age_interval * HZ;
2252 if (time_before_eq(timeout, jiffies)) {
2253 netdev_dbg(vxlan->dev,
2254 "garbage collect %pM\n",
2255 f->eth_addr);
2256 f->state = NUD_STALE;
2257 vxlan_fdb_destroy(vxlan, f);
2258 } else if (time_before(timeout, next_timer))
2259 next_timer = timeout;
2260 }
2261 spin_unlock_bh(&vxlan->hash_lock);
2262 }
2263
2264 mod_timer(&vxlan->age_timer, next_timer);
2265 }
2266
2267 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2268 {
2269 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2270 __u32 vni = vxlan->default_dst.remote_vni;
2271
2272 spin_lock(&vn->sock_lock);
2273 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2274 spin_unlock(&vn->sock_lock);
2275 }
2276
2277 /* Setup stats when device is created */
2278 static int vxlan_init(struct net_device *dev)
2279 {
2280 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2281 if (!dev->tstats)
2282 return -ENOMEM;
2283
2284 return 0;
2285 }
2286
2287 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2288 {
2289 struct vxlan_fdb *f;
2290
2291 spin_lock_bh(&vxlan->hash_lock);
2292 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2293 if (f)
2294 vxlan_fdb_destroy(vxlan, f);
2295 spin_unlock_bh(&vxlan->hash_lock);
2296 }
2297
2298 static void vxlan_uninit(struct net_device *dev)
2299 {
2300 struct vxlan_dev *vxlan = netdev_priv(dev);
2301
2302 vxlan_fdb_delete_default(vxlan);
2303
2304 free_percpu(dev->tstats);
2305 }
2306
2307 /* Start ageing timer and join group when device is brought up */
2308 static int vxlan_open(struct net_device *dev)
2309 {
2310 struct vxlan_dev *vxlan = netdev_priv(dev);
2311 int ret;
2312
2313 ret = vxlan_sock_add(vxlan);
2314 if (ret < 0)
2315 return ret;
2316
2317 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2318 ret = vxlan_igmp_join(vxlan);
2319 if (ret == -EADDRINUSE)
2320 ret = 0;
2321 if (ret) {
2322 vxlan_sock_release(vxlan);
2323 return ret;
2324 }
2325 }
2326
2327 if (vxlan->cfg.age_interval)
2328 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2329
2330 return ret;
2331 }
2332
2333 /* Purge the forwarding table */
2334 static void vxlan_flush(struct vxlan_dev *vxlan)
2335 {
2336 unsigned int h;
2337
2338 spin_lock_bh(&vxlan->hash_lock);
2339 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2340 struct hlist_node *p, *n;
2341 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2342 struct vxlan_fdb *f
2343 = container_of(p, struct vxlan_fdb, hlist);
2344 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2345 if (!is_zero_ether_addr(f->eth_addr))
2346 vxlan_fdb_destroy(vxlan, f);
2347 }
2348 }
2349 spin_unlock_bh(&vxlan->hash_lock);
2350 }
2351
2352 /* Cleanup timer and forwarding table on shutdown */
2353 static int vxlan_stop(struct net_device *dev)
2354 {
2355 struct vxlan_dev *vxlan = netdev_priv(dev);
2356 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2357 int ret = 0;
2358
2359 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2360 !vxlan_group_used(vn, vxlan))
2361 ret = vxlan_igmp_leave(vxlan);
2362
2363 del_timer_sync(&vxlan->age_timer);
2364
2365 vxlan_flush(vxlan);
2366 vxlan_sock_release(vxlan);
2367
2368 return ret;
2369 }
2370
2371 /* Stub, nothing needs to be done. */
2372 static void vxlan_set_multicast_list(struct net_device *dev)
2373 {
2374 }
2375
2376 static int __vxlan_change_mtu(struct net_device *dev,
2377 struct net_device *lowerdev,
2378 struct vxlan_rdst *dst, int new_mtu, bool strict)
2379 {
2380 int max_mtu = IP_MAX_MTU;
2381
2382 if (lowerdev)
2383 max_mtu = lowerdev->mtu;
2384
2385 if (dst->remote_ip.sa.sa_family == AF_INET6)
2386 max_mtu -= VXLAN6_HEADROOM;
2387 else
2388 max_mtu -= VXLAN_HEADROOM;
2389
2390 if (new_mtu < 68)
2391 return -EINVAL;
2392
2393 if (new_mtu > max_mtu) {
2394 if (strict)
2395 return -EINVAL;
2396
2397 new_mtu = max_mtu;
2398 }
2399
2400 dev->mtu = new_mtu;
2401 return 0;
2402 }
2403
2404 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2405 {
2406 struct vxlan_dev *vxlan = netdev_priv(dev);
2407 struct vxlan_rdst *dst = &vxlan->default_dst;
2408 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2409 dst->remote_ifindex);
2410 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2411 }
2412
2413 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2414 struct ip_tunnel_info *info,
2415 __be16 sport, __be16 dport)
2416 {
2417 struct vxlan_dev *vxlan = netdev_priv(dev);
2418 struct rtable *rt;
2419 struct flowi4 fl4;
2420
2421 memset(&fl4, 0, sizeof(fl4));
2422 fl4.flowi4_tos = RT_TOS(info->key.tos);
2423 fl4.flowi4_mark = skb->mark;
2424 fl4.flowi4_proto = IPPROTO_UDP;
2425 fl4.daddr = info->key.u.ipv4.dst;
2426
2427 rt = ip_route_output_key(vxlan->net, &fl4);
2428 if (IS_ERR(rt))
2429 return PTR_ERR(rt);
2430 ip_rt_put(rt);
2431
2432 info->key.u.ipv4.src = fl4.saddr;
2433 info->key.tp_src = sport;
2434 info->key.tp_dst = dport;
2435 return 0;
2436 }
2437
2438 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2439 {
2440 struct vxlan_dev *vxlan = netdev_priv(dev);
2441 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2442 __be16 sport, dport;
2443
2444 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2445 vxlan->cfg.port_max, true);
2446 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2447
2448 if (ip_tunnel_info_af(info) == AF_INET) {
2449 if (!vxlan->vn4_sock)
2450 return -EINVAL;
2451 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2452 } else {
2453 #if IS_ENABLED(CONFIG_IPV6)
2454 struct dst_entry *ndst;
2455
2456 if (!vxlan->vn6_sock)
2457 return -EINVAL;
2458 ndst = vxlan6_get_route(vxlan, skb, 0,
2459 &info->key.u.ipv6.dst,
2460 &info->key.u.ipv6.src);
2461 if (IS_ERR(ndst))
2462 return PTR_ERR(ndst);
2463 dst_release(ndst);
2464
2465 info->key.tp_src = sport;
2466 info->key.tp_dst = dport;
2467 #else /* !CONFIG_IPV6 */
2468 return -EPFNOSUPPORT;
2469 #endif
2470 }
2471 return 0;
2472 }
2473
2474 static const struct net_device_ops vxlan_netdev_ops = {
2475 .ndo_init = vxlan_init,
2476 .ndo_uninit = vxlan_uninit,
2477 .ndo_open = vxlan_open,
2478 .ndo_stop = vxlan_stop,
2479 .ndo_start_xmit = vxlan_xmit,
2480 .ndo_get_stats64 = ip_tunnel_get_stats64,
2481 .ndo_set_rx_mode = vxlan_set_multicast_list,
2482 .ndo_change_mtu = vxlan_change_mtu,
2483 .ndo_validate_addr = eth_validate_addr,
2484 .ndo_set_mac_address = eth_mac_addr,
2485 .ndo_fdb_add = vxlan_fdb_add,
2486 .ndo_fdb_del = vxlan_fdb_delete,
2487 .ndo_fdb_dump = vxlan_fdb_dump,
2488 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2489 };
2490
2491 /* Info for udev, that this is a virtual tunnel endpoint */
2492 static struct device_type vxlan_type = {
2493 .name = "vxlan",
2494 };
2495
2496 /* Calls the ndo_add_vxlan_port of the caller in order to
2497 * supply the listening VXLAN udp ports. Callers are expected
2498 * to implement the ndo_add_vxlan_port.
2499 */
2500 void vxlan_get_rx_port(struct net_device *dev)
2501 {
2502 struct vxlan_sock *vs;
2503 struct net *net = dev_net(dev);
2504 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2505 sa_family_t sa_family;
2506 __be16 port;
2507 unsigned int i;
2508
2509 spin_lock(&vn->sock_lock);
2510 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2511 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2512 port = inet_sk(vs->sock->sk)->inet_sport;
2513 sa_family = vxlan_get_sk_family(vs);
2514 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2515 port);
2516 }
2517 }
2518 spin_unlock(&vn->sock_lock);
2519 }
2520 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2521
2522 /* Initialize the device structure. */
2523 static void vxlan_setup(struct net_device *dev)
2524 {
2525 struct vxlan_dev *vxlan = netdev_priv(dev);
2526 unsigned int h;
2527
2528 eth_hw_addr_random(dev);
2529 ether_setup(dev);
2530
2531 dev->netdev_ops = &vxlan_netdev_ops;
2532 dev->destructor = free_netdev;
2533 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2534
2535 dev->features |= NETIF_F_LLTX;
2536 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2537 dev->features |= NETIF_F_RXCSUM;
2538 dev->features |= NETIF_F_GSO_SOFTWARE;
2539
2540 dev->vlan_features = dev->features;
2541 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2542 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2543 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2544 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2545 netif_keep_dst(dev);
2546 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2547 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2548
2549 INIT_LIST_HEAD(&vxlan->next);
2550 spin_lock_init(&vxlan->hash_lock);
2551
2552 init_timer_deferrable(&vxlan->age_timer);
2553 vxlan->age_timer.function = vxlan_cleanup;
2554 vxlan->age_timer.data = (unsigned long) vxlan;
2555
2556 vxlan->cfg.dst_port = htons(vxlan_port);
2557
2558 vxlan->dev = dev;
2559
2560 gro_cells_init(&vxlan->gro_cells, dev);
2561
2562 for (h = 0; h < FDB_HASH_SIZE; ++h)
2563 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2564 }
2565
2566 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2567 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2568 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2569 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2570 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2571 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2572 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2573 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2574 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2575 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2576 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2577 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2578 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2579 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2580 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2581 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2582 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2583 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2584 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2585 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2586 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2587 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2588 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2589 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2590 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2591 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2592 };
2593
2594 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2595 {
2596 if (tb[IFLA_ADDRESS]) {
2597 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2598 pr_debug("invalid link address (not ethernet)\n");
2599 return -EINVAL;
2600 }
2601
2602 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2603 pr_debug("invalid all zero ethernet address\n");
2604 return -EADDRNOTAVAIL;
2605 }
2606 }
2607
2608 if (!data)
2609 return -EINVAL;
2610
2611 if (data[IFLA_VXLAN_ID]) {
2612 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2613 if (id >= VXLAN_VID_MASK)
2614 return -ERANGE;
2615 }
2616
2617 if (data[IFLA_VXLAN_PORT_RANGE]) {
2618 const struct ifla_vxlan_port_range *p
2619 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2620
2621 if (ntohs(p->high) < ntohs(p->low)) {
2622 pr_debug("port range %u .. %u not valid\n",
2623 ntohs(p->low), ntohs(p->high));
2624 return -EINVAL;
2625 }
2626 }
2627
2628 return 0;
2629 }
2630
2631 static void vxlan_get_drvinfo(struct net_device *netdev,
2632 struct ethtool_drvinfo *drvinfo)
2633 {
2634 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2635 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2636 }
2637
2638 static const struct ethtool_ops vxlan_ethtool_ops = {
2639 .get_drvinfo = vxlan_get_drvinfo,
2640 .get_link = ethtool_op_get_link,
2641 };
2642
2643 static void vxlan_del_work(struct work_struct *work)
2644 {
2645 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2646 udp_tunnel_sock_release(vs->sock);
2647 kfree_rcu(vs, rcu);
2648 }
2649
2650 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2651 __be16 port, u32 flags)
2652 {
2653 struct socket *sock;
2654 struct udp_port_cfg udp_conf;
2655 int err;
2656
2657 memset(&udp_conf, 0, sizeof(udp_conf));
2658
2659 if (ipv6) {
2660 udp_conf.family = AF_INET6;
2661 udp_conf.use_udp6_rx_checksums =
2662 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2663 udp_conf.ipv6_v6only = 1;
2664 } else {
2665 udp_conf.family = AF_INET;
2666 }
2667
2668 udp_conf.local_udp_port = port;
2669
2670 /* Open UDP socket */
2671 err = udp_sock_create(net, &udp_conf, &sock);
2672 if (err < 0)
2673 return ERR_PTR(err);
2674
2675 return sock;
2676 }
2677
2678 /* Create new listen socket if needed */
2679 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2680 __be16 port, u32 flags)
2681 {
2682 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2683 struct vxlan_sock *vs;
2684 struct socket *sock;
2685 unsigned int h;
2686 struct udp_tunnel_sock_cfg tunnel_cfg;
2687
2688 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2689 if (!vs)
2690 return ERR_PTR(-ENOMEM);
2691
2692 for (h = 0; h < VNI_HASH_SIZE; ++h)
2693 INIT_HLIST_HEAD(&vs->vni_list[h]);
2694
2695 INIT_WORK(&vs->del_work, vxlan_del_work);
2696
2697 sock = vxlan_create_sock(net, ipv6, port, flags);
2698 if (IS_ERR(sock)) {
2699 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2700 PTR_ERR(sock));
2701 kfree(vs);
2702 return ERR_CAST(sock);
2703 }
2704
2705 vs->sock = sock;
2706 atomic_set(&vs->refcnt, 1);
2707 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2708
2709 /* Initialize the vxlan udp offloads structure */
2710 vs->udp_offloads.port = port;
2711 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2712 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2713
2714 spin_lock(&vn->sock_lock);
2715 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2716 vxlan_notify_add_rx_port(vs);
2717 spin_unlock(&vn->sock_lock);
2718
2719 /* Mark socket as an encapsulation socket. */
2720 tunnel_cfg.sk_user_data = vs;
2721 tunnel_cfg.encap_type = 1;
2722 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2723 tunnel_cfg.encap_destroy = NULL;
2724
2725 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2726
2727 return vs;
2728 }
2729
2730 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2731 {
2732 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2733 struct vxlan_sock *vs = NULL;
2734
2735 if (!vxlan->cfg.no_share) {
2736 spin_lock(&vn->sock_lock);
2737 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2738 vxlan->cfg.dst_port, vxlan->flags);
2739 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2740 spin_unlock(&vn->sock_lock);
2741 return -EBUSY;
2742 }
2743 spin_unlock(&vn->sock_lock);
2744 }
2745 if (!vs)
2746 vs = vxlan_socket_create(vxlan->net, ipv6,
2747 vxlan->cfg.dst_port, vxlan->flags);
2748 if (IS_ERR(vs))
2749 return PTR_ERR(vs);
2750 #if IS_ENABLED(CONFIG_IPV6)
2751 if (ipv6)
2752 vxlan->vn6_sock = vs;
2753 else
2754 #endif
2755 vxlan->vn4_sock = vs;
2756 vxlan_vs_add_dev(vs, vxlan);
2757 return 0;
2758 }
2759
2760 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2761 {
2762 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2763 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2764 int ret = 0;
2765
2766 vxlan->vn4_sock = NULL;
2767 #if IS_ENABLED(CONFIG_IPV6)
2768 vxlan->vn6_sock = NULL;
2769 if (ipv6 || metadata)
2770 ret = __vxlan_sock_add(vxlan, true);
2771 #endif
2772 if (!ret && (!ipv6 || metadata))
2773 ret = __vxlan_sock_add(vxlan, false);
2774 if (ret < 0)
2775 vxlan_sock_release(vxlan);
2776 return ret;
2777 }
2778
2779 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2780 struct vxlan_config *conf)
2781 {
2782 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2783 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2784 struct vxlan_rdst *dst = &vxlan->default_dst;
2785 unsigned short needed_headroom = ETH_HLEN;
2786 int err;
2787 bool use_ipv6 = false;
2788 __be16 default_port = vxlan->cfg.dst_port;
2789 struct net_device *lowerdev = NULL;
2790
2791 vxlan->net = src_net;
2792
2793 dst->remote_vni = conf->vni;
2794
2795 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2796
2797 /* Unless IPv6 is explicitly requested, assume IPv4 */
2798 if (!dst->remote_ip.sa.sa_family)
2799 dst->remote_ip.sa.sa_family = AF_INET;
2800
2801 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2802 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2803 if (!IS_ENABLED(CONFIG_IPV6))
2804 return -EPFNOSUPPORT;
2805 use_ipv6 = true;
2806 vxlan->flags |= VXLAN_F_IPV6;
2807 }
2808
2809 if (conf->remote_ifindex) {
2810 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2811 dst->remote_ifindex = conf->remote_ifindex;
2812
2813 if (!lowerdev) {
2814 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2815 return -ENODEV;
2816 }
2817
2818 #if IS_ENABLED(CONFIG_IPV6)
2819 if (use_ipv6) {
2820 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2821 if (idev && idev->cnf.disable_ipv6) {
2822 pr_info("IPv6 is disabled via sysctl\n");
2823 return -EPERM;
2824 }
2825 }
2826 #endif
2827
2828 if (!conf->mtu)
2829 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2830
2831 needed_headroom = lowerdev->hard_header_len;
2832 }
2833
2834 if (conf->mtu) {
2835 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2836 if (err)
2837 return err;
2838 }
2839
2840 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2841 needed_headroom += VXLAN6_HEADROOM;
2842 else
2843 needed_headroom += VXLAN_HEADROOM;
2844 dev->needed_headroom = needed_headroom;
2845
2846 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2847 if (!vxlan->cfg.dst_port)
2848 vxlan->cfg.dst_port = default_port;
2849 vxlan->flags |= conf->flags;
2850
2851 if (!vxlan->cfg.age_interval)
2852 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2853
2854 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2855 if (tmp->cfg.vni == conf->vni &&
2856 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2857 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2858 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2859 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2860 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2861 return -EEXIST;
2862 }
2863
2864 dev->ethtool_ops = &vxlan_ethtool_ops;
2865
2866 /* create an fdb entry for a valid default destination */
2867 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2868 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2869 &vxlan->default_dst.remote_ip,
2870 NUD_REACHABLE|NUD_PERMANENT,
2871 NLM_F_EXCL|NLM_F_CREATE,
2872 vxlan->cfg.dst_port,
2873 vxlan->default_dst.remote_vni,
2874 vxlan->default_dst.remote_ifindex,
2875 NTF_SELF);
2876 if (err)
2877 return err;
2878 }
2879
2880 err = register_netdevice(dev);
2881 if (err) {
2882 vxlan_fdb_delete_default(vxlan);
2883 return err;
2884 }
2885
2886 list_add(&vxlan->next, &vn->vxlan_list);
2887
2888 return 0;
2889 }
2890
2891 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2892 u8 name_assign_type, struct vxlan_config *conf)
2893 {
2894 struct nlattr *tb[IFLA_MAX+1];
2895 struct net_device *dev;
2896 int err;
2897
2898 memset(&tb, 0, sizeof(tb));
2899
2900 dev = rtnl_create_link(net, name, name_assign_type,
2901 &vxlan_link_ops, tb);
2902 if (IS_ERR(dev))
2903 return dev;
2904
2905 err = vxlan_dev_configure(net, dev, conf);
2906 if (err < 0) {
2907 free_netdev(dev);
2908 return ERR_PTR(err);
2909 }
2910
2911 return dev;
2912 }
2913 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2914
2915 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2916 struct nlattr *tb[], struct nlattr *data[])
2917 {
2918 struct vxlan_config conf;
2919 int err;
2920
2921 memset(&conf, 0, sizeof(conf));
2922
2923 if (data[IFLA_VXLAN_ID])
2924 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2925
2926 if (data[IFLA_VXLAN_GROUP]) {
2927 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2928 } else if (data[IFLA_VXLAN_GROUP6]) {
2929 if (!IS_ENABLED(CONFIG_IPV6))
2930 return -EPFNOSUPPORT;
2931
2932 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2933 conf.remote_ip.sa.sa_family = AF_INET6;
2934 }
2935
2936 if (data[IFLA_VXLAN_LOCAL]) {
2937 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2938 conf.saddr.sa.sa_family = AF_INET;
2939 } else if (data[IFLA_VXLAN_LOCAL6]) {
2940 if (!IS_ENABLED(CONFIG_IPV6))
2941 return -EPFNOSUPPORT;
2942
2943 /* TODO: respect scope id */
2944 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2945 conf.saddr.sa.sa_family = AF_INET6;
2946 }
2947
2948 if (data[IFLA_VXLAN_LINK])
2949 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2950
2951 if (data[IFLA_VXLAN_TOS])
2952 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2953
2954 if (data[IFLA_VXLAN_TTL])
2955 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2956
2957 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2958 conf.flags |= VXLAN_F_LEARN;
2959
2960 if (data[IFLA_VXLAN_AGEING])
2961 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2962
2963 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2964 conf.flags |= VXLAN_F_PROXY;
2965
2966 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2967 conf.flags |= VXLAN_F_RSC;
2968
2969 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2970 conf.flags |= VXLAN_F_L2MISS;
2971
2972 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2973 conf.flags |= VXLAN_F_L3MISS;
2974
2975 if (data[IFLA_VXLAN_LIMIT])
2976 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2977
2978 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2979 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2980 conf.flags |= VXLAN_F_COLLECT_METADATA;
2981
2982 if (data[IFLA_VXLAN_PORT_RANGE]) {
2983 const struct ifla_vxlan_port_range *p
2984 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2985 conf.port_min = ntohs(p->low);
2986 conf.port_max = ntohs(p->high);
2987 }
2988
2989 if (data[IFLA_VXLAN_PORT])
2990 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2991
2992 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2993 conf.flags |= VXLAN_F_UDP_CSUM;
2994
2995 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2996 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2997 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2998
2999 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3000 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3001 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3002
3003 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3004 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3005 conf.flags |= VXLAN_F_REMCSUM_TX;
3006
3007 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3008 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3009 conf.flags |= VXLAN_F_REMCSUM_RX;
3010
3011 if (data[IFLA_VXLAN_GBP])
3012 conf.flags |= VXLAN_F_GBP;
3013
3014 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3015 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3016
3017 err = vxlan_dev_configure(src_net, dev, &conf);
3018 switch (err) {
3019 case -ENODEV:
3020 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3021 break;
3022
3023 case -EPERM:
3024 pr_info("IPv6 is disabled via sysctl\n");
3025 break;
3026
3027 case -EEXIST:
3028 pr_info("duplicate VNI %u\n", conf.vni);
3029 break;
3030 }
3031
3032 return err;
3033 }
3034
3035 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3036 {
3037 struct vxlan_dev *vxlan = netdev_priv(dev);
3038 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3039
3040 spin_lock(&vn->sock_lock);
3041 if (!hlist_unhashed(&vxlan->hlist))
3042 hlist_del_rcu(&vxlan->hlist);
3043 spin_unlock(&vn->sock_lock);
3044
3045 gro_cells_destroy(&vxlan->gro_cells);
3046 list_del(&vxlan->next);
3047 unregister_netdevice_queue(dev, head);
3048 }
3049
3050 static size_t vxlan_get_size(const struct net_device *dev)
3051 {
3052
3053 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3054 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3055 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3056 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3057 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3058 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3059 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3060 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3061 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3062 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3063 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3064 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3065 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3066 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3067 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3068 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3069 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3070 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3071 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3072 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3073 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3074 0;
3075 }
3076
3077 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3078 {
3079 const struct vxlan_dev *vxlan = netdev_priv(dev);
3080 const struct vxlan_rdst *dst = &vxlan->default_dst;
3081 struct ifla_vxlan_port_range ports = {
3082 .low = htons(vxlan->cfg.port_min),
3083 .high = htons(vxlan->cfg.port_max),
3084 };
3085
3086 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3087 goto nla_put_failure;
3088
3089 if (!vxlan_addr_any(&dst->remote_ip)) {
3090 if (dst->remote_ip.sa.sa_family == AF_INET) {
3091 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3092 dst->remote_ip.sin.sin_addr.s_addr))
3093 goto nla_put_failure;
3094 #if IS_ENABLED(CONFIG_IPV6)
3095 } else {
3096 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3097 &dst->remote_ip.sin6.sin6_addr))
3098 goto nla_put_failure;
3099 #endif
3100 }
3101 }
3102
3103 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3104 goto nla_put_failure;
3105
3106 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3107 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3108 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3109 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3110 goto nla_put_failure;
3111 #if IS_ENABLED(CONFIG_IPV6)
3112 } else {
3113 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3114 &vxlan->cfg.saddr.sin6.sin6_addr))
3115 goto nla_put_failure;
3116 #endif
3117 }
3118 }
3119
3120 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3121 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3122 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3123 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3124 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3125 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3126 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3127 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3128 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3129 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3130 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3131 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3132 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3133 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3134 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3135 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3136 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3137 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3138 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3139 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3140 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3141 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3142 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3143 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3144 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3145 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3146 goto nla_put_failure;
3147
3148 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3149 goto nla_put_failure;
3150
3151 if (vxlan->flags & VXLAN_F_GBP &&
3152 nla_put_flag(skb, IFLA_VXLAN_GBP))
3153 goto nla_put_failure;
3154
3155 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3156 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3157 goto nla_put_failure;
3158
3159 return 0;
3160
3161 nla_put_failure:
3162 return -EMSGSIZE;
3163 }
3164
3165 static struct net *vxlan_get_link_net(const struct net_device *dev)
3166 {
3167 struct vxlan_dev *vxlan = netdev_priv(dev);
3168
3169 return vxlan->net;
3170 }
3171
3172 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3173 .kind = "vxlan",
3174 .maxtype = IFLA_VXLAN_MAX,
3175 .policy = vxlan_policy,
3176 .priv_size = sizeof(struct vxlan_dev),
3177 .setup = vxlan_setup,
3178 .validate = vxlan_validate,
3179 .newlink = vxlan_newlink,
3180 .dellink = vxlan_dellink,
3181 .get_size = vxlan_get_size,
3182 .fill_info = vxlan_fill_info,
3183 .get_link_net = vxlan_get_link_net,
3184 };
3185
3186 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3187 struct net_device *dev)
3188 {
3189 struct vxlan_dev *vxlan, *next;
3190 LIST_HEAD(list_kill);
3191
3192 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3193 struct vxlan_rdst *dst = &vxlan->default_dst;
3194
3195 /* In case we created vxlan device with carrier
3196 * and we loose the carrier due to module unload
3197 * we also need to remove vxlan device. In other
3198 * cases, it's not necessary and remote_ifindex
3199 * is 0 here, so no matches.
3200 */
3201 if (dst->remote_ifindex == dev->ifindex)
3202 vxlan_dellink(vxlan->dev, &list_kill);
3203 }
3204
3205 unregister_netdevice_many(&list_kill);
3206 }
3207
3208 static int vxlan_lowerdev_event(struct notifier_block *unused,
3209 unsigned long event, void *ptr)
3210 {
3211 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3212 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3213
3214 if (event == NETDEV_UNREGISTER)
3215 vxlan_handle_lowerdev_unregister(vn, dev);
3216
3217 return NOTIFY_DONE;
3218 }
3219
3220 static struct notifier_block vxlan_notifier_block __read_mostly = {
3221 .notifier_call = vxlan_lowerdev_event,
3222 };
3223
3224 static __net_init int vxlan_init_net(struct net *net)
3225 {
3226 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3227 unsigned int h;
3228
3229 INIT_LIST_HEAD(&vn->vxlan_list);
3230 spin_lock_init(&vn->sock_lock);
3231
3232 for (h = 0; h < PORT_HASH_SIZE; ++h)
3233 INIT_HLIST_HEAD(&vn->sock_list[h]);
3234
3235 return 0;
3236 }
3237
3238 static void __net_exit vxlan_exit_net(struct net *net)
3239 {
3240 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3241 struct vxlan_dev *vxlan, *next;
3242 struct net_device *dev, *aux;
3243 LIST_HEAD(list);
3244
3245 rtnl_lock();
3246 for_each_netdev_safe(net, dev, aux)
3247 if (dev->rtnl_link_ops == &vxlan_link_ops)
3248 unregister_netdevice_queue(dev, &list);
3249
3250 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3251 /* If vxlan->dev is in the same netns, it has already been added
3252 * to the list by the previous loop.
3253 */
3254 if (!net_eq(dev_net(vxlan->dev), net)) {
3255 gro_cells_destroy(&vxlan->gro_cells);
3256 unregister_netdevice_queue(vxlan->dev, &list);
3257 }
3258 }
3259
3260 unregister_netdevice_many(&list);
3261 rtnl_unlock();
3262 }
3263
3264 static struct pernet_operations vxlan_net_ops = {
3265 .init = vxlan_init_net,
3266 .exit = vxlan_exit_net,
3267 .id = &vxlan_net_id,
3268 .size = sizeof(struct vxlan_net),
3269 };
3270
3271 static int __init vxlan_init_module(void)
3272 {
3273 int rc;
3274
3275 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3276 if (!vxlan_wq)
3277 return -ENOMEM;
3278
3279 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3280
3281 rc = register_pernet_subsys(&vxlan_net_ops);
3282 if (rc)
3283 goto out1;
3284
3285 rc = register_netdevice_notifier(&vxlan_notifier_block);
3286 if (rc)
3287 goto out2;
3288
3289 rc = rtnl_link_register(&vxlan_link_ops);
3290 if (rc)
3291 goto out3;
3292
3293 return 0;
3294 out3:
3295 unregister_netdevice_notifier(&vxlan_notifier_block);
3296 out2:
3297 unregister_pernet_subsys(&vxlan_net_ops);
3298 out1:
3299 destroy_workqueue(vxlan_wq);
3300 return rc;
3301 }
3302 late_initcall(vxlan_init_module);
3303
3304 static void __exit vxlan_cleanup_module(void)
3305 {
3306 rtnl_link_unregister(&vxlan_link_ops);
3307 unregister_netdevice_notifier(&vxlan_notifier_block);
3308 destroy_workqueue(vxlan_wq);
3309 unregister_pernet_subsys(&vxlan_net_ops);
3310 /* rcu_barrier() is called by netns */
3311 }
3312 module_exit(vxlan_cleanup_module);
3313
3314 MODULE_LICENSE("GPL");
3315 MODULE_VERSION(VXLAN_VERSION);
3316 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3317 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3318 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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