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binder: Add support for scatter-gather
[linux/fpc-iii.git] / drivers / net / vxlan.c
blob50b62db213b0568aee2106492fbb216741a0561a
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/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/udp.h>
18 #include <linux/igmp.h>
19 #include <linux/if_ether.h>
20 #include <linux/ethtool.h>
21 #include <net/arp.h>
22 #include <net/ndisc.h>
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/rtnetlink.h>
26 #include <net/inet_ecn.h>
27 #include <net/net_namespace.h>
28 #include <net/netns/generic.h>
29 #include <net/vxlan.h>
30
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
34 #endif
35
36 #define VXLAN_VERSION "0.1"
37
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
42
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
46 */
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
50
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
54
55 static unsigned int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
57
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
59
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
61
62 /* per-network namespace private data for this module */
63 struct vxlan_net {
64 struct list_head vxlan_list;
65 struct hlist_head sock_list[PORT_HASH_SIZE];
66 spinlock_t sock_lock;
67 };
68
69 /* Forwarding table entry */
70 struct vxlan_fdb {
71 struct hlist_node hlist; /* linked list of entries */
72 struct rcu_head rcu;
73 unsigned long updated; /* jiffies */
74 unsigned long used;
75 struct list_head remotes;
76 u8 eth_addr[ETH_ALEN];
77 u16 state; /* see ndm_state */
78 u8 flags; /* see ndm_flags */
79 };
80
81 /* salt for hash table */
82 static u32 vxlan_salt __read_mostly;
83
84 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
85 {
86 return vs->flags & VXLAN_F_COLLECT_METADATA ||
87 ip_tunnel_collect_metadata();
88 }
89
90 #if IS_ENABLED(CONFIG_IPV6)
91 static inline
92 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
93 {
94 if (a->sa.sa_family != b->sa.sa_family)
95 return false;
96 if (a->sa.sa_family == AF_INET6)
97 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
98 else
99 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
100 }
101
102 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
103 {
104 if (ipa->sa.sa_family == AF_INET6)
105 return ipv6_addr_any(&ipa->sin6.sin6_addr);
106 else
107 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
108 }
109
110 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
111 {
112 if (ipa->sa.sa_family == AF_INET6)
113 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
114 else
115 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
116 }
117
118 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
119 {
120 if (nla_len(nla) >= sizeof(struct in6_addr)) {
121 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
122 ip->sa.sa_family = AF_INET6;
123 return 0;
124 } else if (nla_len(nla) >= sizeof(__be32)) {
125 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
126 ip->sa.sa_family = AF_INET;
127 return 0;
128 } else {
129 return -EAFNOSUPPORT;
130 }
131 }
132
133 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
134 const union vxlan_addr *ip)
135 {
136 if (ip->sa.sa_family == AF_INET6)
137 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
138 else
139 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
140 }
141
142 #else /* !CONFIG_IPV6 */
143
144 static inline
145 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
146 {
147 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
148 }
149
150 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
151 {
152 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
153 }
154
155 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
156 {
157 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
158 }
159
160 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
161 {
162 if (nla_len(nla) >= sizeof(struct in6_addr)) {
163 return -EAFNOSUPPORT;
164 } else if (nla_len(nla) >= sizeof(__be32)) {
165 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
166 ip->sa.sa_family = AF_INET;
167 return 0;
168 } else {
169 return -EAFNOSUPPORT;
170 }
171 }
172
173 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
174 const union vxlan_addr *ip)
175 {
176 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
177 }
178 #endif
179
180 /* Virtual Network hash table head */
181 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
182 {
183 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
184 }
185
186 /* Socket hash table head */
187 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
188 {
189 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
190
191 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
192 }
193
194 /* First remote destination for a forwarding entry.
195 * Guaranteed to be non-NULL because remotes are never deleted.
196 */
197 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
198 {
199 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
200 }
201
202 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
203 {
204 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
205 }
206
207 /* Find VXLAN socket based on network namespace, address family and UDP port
208 * and enabled unshareable flags.
209 */
210 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
211 __be16 port, u32 flags)
212 {
213 struct vxlan_sock *vs;
214
215 flags &= VXLAN_F_RCV_FLAGS;
216
217 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
218 if (inet_sk(vs->sock->sk)->inet_sport == port &&
219 vxlan_get_sk_family(vs) == family &&
220 vs->flags == flags)
221 return vs;
222 }
223 return NULL;
224 }
225
226 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
227 {
228 struct vxlan_dev *vxlan;
229
230 /* For flow based devices, map all packets to VNI 0 */
231 if (vs->flags & VXLAN_F_COLLECT_METADATA)
232 vni = 0;
233
234 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
235 if (vxlan->default_dst.remote_vni == vni)
236 return vxlan;
237 }
238
239 return NULL;
240 }
241
242 /* Look up VNI in a per net namespace table */
243 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
244 sa_family_t family, __be16 port,
245 u32 flags)
246 {
247 struct vxlan_sock *vs;
248
249 vs = vxlan_find_sock(net, family, port, flags);
250 if (!vs)
251 return NULL;
252
253 return vxlan_vs_find_vni(vs, vni);
254 }
255
256 /* Fill in neighbour message in skbuff. */
257 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
258 const struct vxlan_fdb *fdb,
259 u32 portid, u32 seq, int type, unsigned int flags,
260 const struct vxlan_rdst *rdst)
261 {
262 unsigned long now = jiffies;
263 struct nda_cacheinfo ci;
264 struct nlmsghdr *nlh;
265 struct ndmsg *ndm;
266 bool send_ip, send_eth;
267
268 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
269 if (nlh == NULL)
270 return -EMSGSIZE;
271
272 ndm = nlmsg_data(nlh);
273 memset(ndm, 0, sizeof(*ndm));
274
275 send_eth = send_ip = true;
276
277 if (type == RTM_GETNEIGH) {
278 ndm->ndm_family = AF_INET;
279 send_ip = !vxlan_addr_any(&rdst->remote_ip);
280 send_eth = !is_zero_ether_addr(fdb->eth_addr);
281 } else
282 ndm->ndm_family = AF_BRIDGE;
283 ndm->ndm_state = fdb->state;
284 ndm->ndm_ifindex = vxlan->dev->ifindex;
285 ndm->ndm_flags = fdb->flags;
286 ndm->ndm_type = RTN_UNICAST;
287
288 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
289 nla_put_s32(skb, NDA_LINK_NETNSID,
290 peernet2id(dev_net(vxlan->dev), vxlan->net)))
291 goto nla_put_failure;
292
293 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
294 goto nla_put_failure;
295
296 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
297 goto nla_put_failure;
298
299 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
300 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
301 goto nla_put_failure;
302 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
303 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
304 goto nla_put_failure;
305 if (rdst->remote_ifindex &&
306 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
307 goto nla_put_failure;
308
309 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
310 ci.ndm_confirmed = 0;
311 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
312 ci.ndm_refcnt = 0;
313
314 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
315 goto nla_put_failure;
316
317 nlmsg_end(skb, nlh);
318 return 0;
319
320 nla_put_failure:
321 nlmsg_cancel(skb, nlh);
322 return -EMSGSIZE;
323 }
324
325 static inline size_t vxlan_nlmsg_size(void)
326 {
327 return NLMSG_ALIGN(sizeof(struct ndmsg))
328 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
329 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
330 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
331 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
332 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
333 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
334 + nla_total_size(sizeof(struct nda_cacheinfo));
335 }
336
337 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
338 struct vxlan_rdst *rd, int type)
339 {
340 struct net *net = dev_net(vxlan->dev);
341 struct sk_buff *skb;
342 int err = -ENOBUFS;
343
344 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
345 if (skb == NULL)
346 goto errout;
347
348 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
349 if (err < 0) {
350 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
351 WARN_ON(err == -EMSGSIZE);
352 kfree_skb(skb);
353 goto errout;
354 }
355
356 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
357 return;
358 errout:
359 if (err < 0)
360 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
361 }
362
363 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
364 {
365 struct vxlan_dev *vxlan = netdev_priv(dev);
366 struct vxlan_fdb f = {
367 .state = NUD_STALE,
368 };
369 struct vxlan_rdst remote = {
370 .remote_ip = *ipa, /* goes to NDA_DST */
371 .remote_vni = cpu_to_be32(VXLAN_N_VID),
372 };
373
374 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
375 }
376
377 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
378 {
379 struct vxlan_fdb f = {
380 .state = NUD_STALE,
381 };
382 struct vxlan_rdst remote = { };
383
384 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
385
386 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
387 }
388
389 /* Hash Ethernet address */
390 static u32 eth_hash(const unsigned char *addr)
391 {
392 u64 value = get_unaligned((u64 *)addr);
393
394 /* only want 6 bytes */
395 #ifdef __BIG_ENDIAN
396 value >>= 16;
397 #else
398 value <<= 16;
399 #endif
400 return hash_64(value, FDB_HASH_BITS);
401 }
402
403 /* Hash chain to use given mac address */
404 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
405 const u8 *mac)
406 {
407 return &vxlan->fdb_head[eth_hash(mac)];
408 }
409
410 /* Look up Ethernet address in forwarding table */
411 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
412 const u8 *mac)
413 {
414 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
415 struct vxlan_fdb *f;
416
417 hlist_for_each_entry_rcu(f, head, hlist) {
418 if (ether_addr_equal(mac, f->eth_addr))
419 return f;
420 }
421
422 return NULL;
423 }
424
425 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
426 const u8 *mac)
427 {
428 struct vxlan_fdb *f;
429
430 f = __vxlan_find_mac(vxlan, mac);
431 if (f)
432 f->used = jiffies;
433
434 return f;
435 }
436
437 /* caller should hold vxlan->hash_lock */
438 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
439 union vxlan_addr *ip, __be16 port,
440 __be32 vni, __u32 ifindex)
441 {
442 struct vxlan_rdst *rd;
443
444 list_for_each_entry(rd, &f->remotes, list) {
445 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
446 rd->remote_port == port &&
447 rd->remote_vni == vni &&
448 rd->remote_ifindex == ifindex)
449 return rd;
450 }
451
452 return NULL;
453 }
454
455 /* Replace destination of unicast mac */
456 static int vxlan_fdb_replace(struct vxlan_fdb *f,
457 union vxlan_addr *ip, __be16 port, __be32 vni,
458 __u32 ifindex)
459 {
460 struct vxlan_rdst *rd;
461
462 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
463 if (rd)
464 return 0;
465
466 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
467 if (!rd)
468 return 0;
469
470 dst_cache_reset(&rd->dst_cache);
471 rd->remote_ip = *ip;
472 rd->remote_port = port;
473 rd->remote_vni = vni;
474 rd->remote_ifindex = ifindex;
475 return 1;
476 }
477
478 /* Add/update destinations for multicast */
479 static int vxlan_fdb_append(struct vxlan_fdb *f,
480 union vxlan_addr *ip, __be16 port, __be32 vni,
481 __u32 ifindex, struct vxlan_rdst **rdp)
482 {
483 struct vxlan_rdst *rd;
484
485 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
486 if (rd)
487 return 0;
488
489 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
490 if (rd == NULL)
491 return -ENOBUFS;
492
493 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
494 kfree(rd);
495 return -ENOBUFS;
496 }
497
498 rd->remote_ip = *ip;
499 rd->remote_port = port;
500 rd->remote_vni = vni;
501 rd->remote_ifindex = ifindex;
502
503 list_add_tail_rcu(&rd->list, &f->remotes);
504
505 *rdp = rd;
506 return 1;
507 }
508
509 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
510 unsigned int off,
511 struct vxlanhdr *vh, size_t hdrlen,
512 __be32 vni_field,
513 struct gro_remcsum *grc,
514 bool nopartial)
515 {
516 size_t start, offset;
517
518 if (skb->remcsum_offload)
519 return vh;
520
521 if (!NAPI_GRO_CB(skb)->csum_valid)
522 return NULL;
523
524 start = vxlan_rco_start(vni_field);
525 offset = start + vxlan_rco_offset(vni_field);
526
527 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
528 start, offset, grc, nopartial);
529
530 skb->remcsum_offload = 1;
531
532 return vh;
533 }
534
535 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
536 struct sk_buff **head,
537 struct sk_buff *skb)
538 {
539 struct sk_buff *p, **pp = NULL;
540 struct vxlanhdr *vh, *vh2;
541 unsigned int hlen, off_vx;
542 int flush = 1;
543 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
544 __be32 flags;
545 struct gro_remcsum grc;
546
547 skb_gro_remcsum_init(&grc);
548
549 off_vx = skb_gro_offset(skb);
550 hlen = off_vx + sizeof(*vh);
551 vh = skb_gro_header_fast(skb, off_vx);
552 if (skb_gro_header_hard(skb, hlen)) {
553 vh = skb_gro_header_slow(skb, hlen, off_vx);
554 if (unlikely(!vh))
555 goto out;
556 }
557
558 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
559
560 flags = vh->vx_flags;
561
562 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
563 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
564 vh->vx_vni, &grc,
565 !!(vs->flags &
566 VXLAN_F_REMCSUM_NOPARTIAL));
567
568 if (!vh)
569 goto out;
570 }
571
572 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
573
574 for (p = *head; p; p = p->next) {
575 if (!NAPI_GRO_CB(p)->same_flow)
576 continue;
577
578 vh2 = (struct vxlanhdr *)(p->data + off_vx);
579 if (vh->vx_flags != vh2->vx_flags ||
580 vh->vx_vni != vh2->vx_vni) {
581 NAPI_GRO_CB(p)->same_flow = 0;
582 continue;
583 }
584 }
585
586 pp = call_gro_receive(eth_gro_receive, head, skb);
587 flush = 0;
588
589 out:
590 skb_gro_remcsum_cleanup(skb, &grc);
591 NAPI_GRO_CB(skb)->flush |= flush;
592
593 return pp;
594 }
595
596 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
597 {
598 /* Sets 'skb->inner_mac_header' since we are always called with
599 * 'skb->encapsulation' set.
600 */
601 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
602 }
603
604 /* Add new entry to forwarding table -- assumes lock held */
605 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
606 const u8 *mac, union vxlan_addr *ip,
607 __u16 state, __u16 flags,
608 __be16 port, __be32 vni, __u32 ifindex,
609 __u8 ndm_flags)
610 {
611 struct vxlan_rdst *rd = NULL;
612 struct vxlan_fdb *f;
613 int notify = 0;
614 int rc;
615
616 f = __vxlan_find_mac(vxlan, mac);
617 if (f) {
618 if (flags & NLM_F_EXCL) {
619 netdev_dbg(vxlan->dev,
620 "lost race to create %pM\n", mac);
621 return -EEXIST;
622 }
623 if (f->state != state) {
624 f->state = state;
625 f->updated = jiffies;
626 notify = 1;
627 }
628 if (f->flags != ndm_flags) {
629 f->flags = ndm_flags;
630 f->updated = jiffies;
631 notify = 1;
632 }
633 if ((flags & NLM_F_REPLACE)) {
634 /* Only change unicasts */
635 if (!(is_multicast_ether_addr(f->eth_addr) ||
636 is_zero_ether_addr(f->eth_addr))) {
637 notify |= vxlan_fdb_replace(f, ip, port, vni,
638 ifindex);
639 } else
640 return -EOPNOTSUPP;
641 }
642 if ((flags & NLM_F_APPEND) &&
643 (is_multicast_ether_addr(f->eth_addr) ||
644 is_zero_ether_addr(f->eth_addr))) {
645 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
646
647 if (rc < 0)
648 return rc;
649 notify |= rc;
650 }
651 } else {
652 if (!(flags & NLM_F_CREATE))
653 return -ENOENT;
654
655 if (vxlan->cfg.addrmax &&
656 vxlan->addrcnt >= vxlan->cfg.addrmax)
657 return -ENOSPC;
658
659 /* Disallow replace to add a multicast entry */
660 if ((flags & NLM_F_REPLACE) &&
661 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
662 return -EOPNOTSUPP;
663
664 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
665 f = kmalloc(sizeof(*f), GFP_ATOMIC);
666 if (!f)
667 return -ENOMEM;
668
669 notify = 1;
670 f->state = state;
671 f->flags = ndm_flags;
672 f->updated = f->used = jiffies;
673 INIT_LIST_HEAD(&f->remotes);
674 memcpy(f->eth_addr, mac, ETH_ALEN);
675
676 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
677 if (rc < 0) {
678 kfree(f);
679 return rc;
680 }
681
682 ++vxlan->addrcnt;
683 hlist_add_head_rcu(&f->hlist,
684 vxlan_fdb_head(vxlan, mac));
685 }
686
687 if (notify) {
688 if (rd == NULL)
689 rd = first_remote_rtnl(f);
690 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
691 }
692
693 return 0;
694 }
695
696 static void vxlan_fdb_free(struct rcu_head *head)
697 {
698 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
699 struct vxlan_rdst *rd, *nd;
700
701 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
702 dst_cache_destroy(&rd->dst_cache);
703 kfree(rd);
704 }
705 kfree(f);
706 }
707
708 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
709 {
710 netdev_dbg(vxlan->dev,
711 "delete %pM\n", f->eth_addr);
712
713 --vxlan->addrcnt;
714 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
715
716 hlist_del_rcu(&f->hlist);
717 call_rcu(&f->rcu, vxlan_fdb_free);
718 }
719
720 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
721 union vxlan_addr *ip, __be16 *port, __be32 *vni,
722 u32 *ifindex)
723 {
724 struct net *net = dev_net(vxlan->dev);
725 int err;
726
727 if (tb[NDA_DST]) {
728 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
729 if (err)
730 return err;
731 } else {
732 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
733 if (remote->sa.sa_family == AF_INET) {
734 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
735 ip->sa.sa_family = AF_INET;
736 #if IS_ENABLED(CONFIG_IPV6)
737 } else {
738 ip->sin6.sin6_addr = in6addr_any;
739 ip->sa.sa_family = AF_INET6;
740 #endif
741 }
742 }
743
744 if (tb[NDA_PORT]) {
745 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
746 return -EINVAL;
747 *port = nla_get_be16(tb[NDA_PORT]);
748 } else {
749 *port = vxlan->cfg.dst_port;
750 }
751
752 if (tb[NDA_VNI]) {
753 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
754 return -EINVAL;
755 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
756 } else {
757 *vni = vxlan->default_dst.remote_vni;
758 }
759
760 if (tb[NDA_IFINDEX]) {
761 struct net_device *tdev;
762
763 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
764 return -EINVAL;
765 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
766 tdev = __dev_get_by_index(net, *ifindex);
767 if (!tdev)
768 return -EADDRNOTAVAIL;
769 } else {
770 *ifindex = 0;
771 }
772
773 return 0;
774 }
775
776 /* Add static entry (via netlink) */
777 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
778 struct net_device *dev,
779 const unsigned char *addr, u16 vid, u16 flags)
780 {
781 struct vxlan_dev *vxlan = netdev_priv(dev);
782 /* struct net *net = dev_net(vxlan->dev); */
783 union vxlan_addr ip;
784 __be16 port;
785 __be32 vni;
786 u32 ifindex;
787 int err;
788
789 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
790 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
791 ndm->ndm_state);
792 return -EINVAL;
793 }
794
795 if (tb[NDA_DST] == NULL)
796 return -EINVAL;
797
798 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
799 if (err)
800 return err;
801
802 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
803 return -EAFNOSUPPORT;
804
805 spin_lock_bh(&vxlan->hash_lock);
806 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
807 port, vni, ifindex, ndm->ndm_flags);
808 spin_unlock_bh(&vxlan->hash_lock);
809
810 return err;
811 }
812
813 /* Delete entry (via netlink) */
814 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
815 struct net_device *dev,
816 const unsigned char *addr, u16 vid)
817 {
818 struct vxlan_dev *vxlan = netdev_priv(dev);
819 struct vxlan_fdb *f;
820 struct vxlan_rdst *rd = NULL;
821 union vxlan_addr ip;
822 __be16 port;
823 __be32 vni;
824 u32 ifindex;
825 int err;
826
827 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
828 if (err)
829 return err;
830
831 err = -ENOENT;
832
833 spin_lock_bh(&vxlan->hash_lock);
834 f = vxlan_find_mac(vxlan, addr);
835 if (!f)
836 goto out;
837
838 if (!vxlan_addr_any(&ip)) {
839 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
840 if (!rd)
841 goto out;
842 }
843
844 err = 0;
845
846 /* remove a destination if it's not the only one on the list,
847 * otherwise destroy the fdb entry
848 */
849 if (rd && !list_is_singular(&f->remotes)) {
850 list_del_rcu(&rd->list);
851 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
852 kfree_rcu(rd, rcu);
853 goto out;
854 }
855
856 vxlan_fdb_destroy(vxlan, f);
857
858 out:
859 spin_unlock_bh(&vxlan->hash_lock);
860
861 return err;
862 }
863
864 /* Dump forwarding table */
865 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
866 struct net_device *dev,
867 struct net_device *filter_dev, int *idx)
868 {
869 struct vxlan_dev *vxlan = netdev_priv(dev);
870 unsigned int h;
871 int err = 0;
872
873 for (h = 0; h < FDB_HASH_SIZE; ++h) {
874 struct vxlan_fdb *f;
875
876 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
877 struct vxlan_rdst *rd;
878
879 list_for_each_entry_rcu(rd, &f->remotes, list) {
880 if (*idx < cb->args[2])
881 goto skip;
882
883 err = vxlan_fdb_info(skb, vxlan, f,
884 NETLINK_CB(cb->skb).portid,
885 cb->nlh->nlmsg_seq,
886 RTM_NEWNEIGH,
887 NLM_F_MULTI, rd);
888 if (err < 0)
889 goto out;
890 skip:
891 *idx += 1;
892 }
893 }
894 }
895 out:
896 return err;
897 }
898
899 /* Watch incoming packets to learn mapping between Ethernet address
900 * and Tunnel endpoint.
901 * Return true if packet is bogus and should be dropped.
902 */
903 static bool vxlan_snoop(struct net_device *dev,
904 union vxlan_addr *src_ip, const u8 *src_mac)
905 {
906 struct vxlan_dev *vxlan = netdev_priv(dev);
907 struct vxlan_fdb *f;
908
909 f = vxlan_find_mac(vxlan, src_mac);
910 if (likely(f)) {
911 struct vxlan_rdst *rdst = first_remote_rcu(f);
912
913 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
914 return false;
915
916 /* Don't migrate static entries, drop packets */
917 if (f->state & NUD_NOARP)
918 return true;
919
920 if (net_ratelimit())
921 netdev_info(dev,
922 "%pM migrated from %pIS to %pIS\n",
923 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
924
925 rdst->remote_ip = *src_ip;
926 f->updated = jiffies;
927 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
928 } else {
929 /* learned new entry */
930 spin_lock(&vxlan->hash_lock);
931
932 /* close off race between vxlan_flush and incoming packets */
933 if (netif_running(dev))
934 vxlan_fdb_create(vxlan, src_mac, src_ip,
935 NUD_REACHABLE,
936 NLM_F_EXCL|NLM_F_CREATE,
937 vxlan->cfg.dst_port,
938 vxlan->default_dst.remote_vni,
939 0, NTF_SELF);
940 spin_unlock(&vxlan->hash_lock);
941 }
942
943 return false;
944 }
945
946 /* See if multicast group is already in use by other ID */
947 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
948 {
949 struct vxlan_dev *vxlan;
950 struct vxlan_sock *sock4;
951 #if IS_ENABLED(CONFIG_IPV6)
952 struct vxlan_sock *sock6;
953 #endif
954 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
955
956 sock4 = rtnl_dereference(dev->vn4_sock);
957
958 /* The vxlan_sock is only used by dev, leaving group has
959 * no effect on other vxlan devices.
960 */
961 if (family == AF_INET && sock4 && atomic_read(&sock4->refcnt) == 1)
962 return false;
963 #if IS_ENABLED(CONFIG_IPV6)
964 sock6 = rtnl_dereference(dev->vn6_sock);
965 if (family == AF_INET6 && sock6 && atomic_read(&sock6->refcnt) == 1)
966 return false;
967 #endif
968
969 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
970 if (!netif_running(vxlan->dev) || vxlan == dev)
971 continue;
972
973 if (family == AF_INET &&
974 rtnl_dereference(vxlan->vn4_sock) != sock4)
975 continue;
976 #if IS_ENABLED(CONFIG_IPV6)
977 if (family == AF_INET6 &&
978 rtnl_dereference(vxlan->vn6_sock) != sock6)
979 continue;
980 #endif
981
982 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
983 &dev->default_dst.remote_ip))
984 continue;
985
986 if (vxlan->default_dst.remote_ifindex !=
987 dev->default_dst.remote_ifindex)
988 continue;
989
990 return true;
991 }
992
993 return false;
994 }
995
996 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
997 {
998 struct vxlan_net *vn;
999
1000 if (!vs)
1001 return false;
1002 if (!atomic_dec_and_test(&vs->refcnt))
1003 return false;
1004
1005 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1006 spin_lock(&vn->sock_lock);
1007 hlist_del_rcu(&vs->hlist);
1008 udp_tunnel_notify_del_rx_port(vs->sock,
1009 (vs->flags & VXLAN_F_GPE) ?
1010 UDP_TUNNEL_TYPE_VXLAN_GPE :
1011 UDP_TUNNEL_TYPE_VXLAN);
1012 spin_unlock(&vn->sock_lock);
1013
1014 return true;
1015 }
1016
1017 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1018 {
1019 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1020 #if IS_ENABLED(CONFIG_IPV6)
1021 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1022
1023 rcu_assign_pointer(vxlan->vn6_sock, NULL);
1024 #endif
1025
1026 rcu_assign_pointer(vxlan->vn4_sock, NULL);
1027 synchronize_net();
1028
1029 if (__vxlan_sock_release_prep(sock4)) {
1030 udp_tunnel_sock_release(sock4->sock);
1031 kfree(sock4);
1032 }
1033
1034 #if IS_ENABLED(CONFIG_IPV6)
1035 if (__vxlan_sock_release_prep(sock6)) {
1036 udp_tunnel_sock_release(sock6->sock);
1037 kfree(sock6);
1038 }
1039 #endif
1040 }
1041
1042 /* Update multicast group membership when first VNI on
1043 * multicast address is brought up
1044 */
1045 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1046 {
1047 struct sock *sk;
1048 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1049 int ifindex = vxlan->default_dst.remote_ifindex;
1050 int ret = -EINVAL;
1051
1052 if (ip->sa.sa_family == AF_INET) {
1053 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1054 struct ip_mreqn mreq = {
1055 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1056 .imr_ifindex = ifindex,
1057 };
1058
1059 sk = sock4->sock->sk;
1060 lock_sock(sk);
1061 ret = ip_mc_join_group(sk, &mreq);
1062 release_sock(sk);
1063 #if IS_ENABLED(CONFIG_IPV6)
1064 } else {
1065 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1066
1067 sk = sock6->sock->sk;
1068 lock_sock(sk);
1069 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1070 &ip->sin6.sin6_addr);
1071 release_sock(sk);
1072 #endif
1073 }
1074
1075 return ret;
1076 }
1077
1078 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1079 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1080 {
1081 struct sock *sk;
1082 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1083 int ifindex = vxlan->default_dst.remote_ifindex;
1084 int ret = -EINVAL;
1085
1086 if (ip->sa.sa_family == AF_INET) {
1087 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1088 struct ip_mreqn mreq = {
1089 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1090 .imr_ifindex = ifindex,
1091 };
1092
1093 sk = sock4->sock->sk;
1094 lock_sock(sk);
1095 ret = ip_mc_leave_group(sk, &mreq);
1096 release_sock(sk);
1097 #if IS_ENABLED(CONFIG_IPV6)
1098 } else {
1099 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1100
1101 sk = sock6->sock->sk;
1102 lock_sock(sk);
1103 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1104 &ip->sin6.sin6_addr);
1105 release_sock(sk);
1106 #endif
1107 }
1108
1109 return ret;
1110 }
1111
1112 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1113 struct sk_buff *skb, u32 vxflags)
1114 {
1115 size_t start, offset;
1116
1117 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1118 goto out;
1119
1120 start = vxlan_rco_start(unparsed->vx_vni);
1121 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1122
1123 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1124 return false;
1125
1126 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1127 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1128 out:
1129 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1130 unparsed->vx_vni &= VXLAN_VNI_MASK;
1131 return true;
1132 }
1133
1134 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1135 struct sk_buff *skb, u32 vxflags,
1136 struct vxlan_metadata *md)
1137 {
1138 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1139 struct metadata_dst *tun_dst;
1140
1141 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1142 goto out;
1143
1144 md->gbp = ntohs(gbp->policy_id);
1145
1146 tun_dst = (struct metadata_dst *)skb_dst(skb);
1147 if (tun_dst) {
1148 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1149 tun_dst->u.tun_info.options_len = sizeof(*md);
1150 }
1151 if (gbp->dont_learn)
1152 md->gbp |= VXLAN_GBP_DONT_LEARN;
1153
1154 if (gbp->policy_applied)
1155 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1156
1157 /* In flow-based mode, GBP is carried in dst_metadata */
1158 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1159 skb->mark = md->gbp;
1160 out:
1161 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1162 }
1163
1164 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1165 __be16 *protocol,
1166 struct sk_buff *skb, u32 vxflags)
1167 {
1168 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1169
1170 /* Need to have Next Protocol set for interfaces in GPE mode. */
1171 if (!gpe->np_applied)
1172 return false;
1173 /* "The initial version is 0. If a receiver does not support the
1174 * version indicated it MUST drop the packet.
1175 */
1176 if (gpe->version != 0)
1177 return false;
1178 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1179 * processing MUST occur." However, we don't implement OAM
1180 * processing, thus drop the packet.
1181 */
1182 if (gpe->oam_flag)
1183 return false;
1184
1185 switch (gpe->next_protocol) {
1186 case VXLAN_GPE_NP_IPV4:
1187 *protocol = htons(ETH_P_IP);
1188 break;
1189 case VXLAN_GPE_NP_IPV6:
1190 *protocol = htons(ETH_P_IPV6);
1191 break;
1192 case VXLAN_GPE_NP_ETHERNET:
1193 *protocol = htons(ETH_P_TEB);
1194 break;
1195 default:
1196 return false;
1197 }
1198
1199 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1200 return true;
1201 }
1202
1203 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1204 struct vxlan_sock *vs,
1205 struct sk_buff *skb)
1206 {
1207 union vxlan_addr saddr;
1208
1209 skb_reset_mac_header(skb);
1210 skb->protocol = eth_type_trans(skb, vxlan->dev);
1211 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1212
1213 /* Ignore packet loops (and multicast echo) */
1214 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1215 return false;
1216
1217 /* Get address from the outer IP header */
1218 if (vxlan_get_sk_family(vs) == AF_INET) {
1219 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1220 saddr.sa.sa_family = AF_INET;
1221 #if IS_ENABLED(CONFIG_IPV6)
1222 } else {
1223 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1224 saddr.sa.sa_family = AF_INET6;
1225 #endif
1226 }
1227
1228 if ((vxlan->flags & VXLAN_F_LEARN) &&
1229 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1230 return false;
1231
1232 return true;
1233 }
1234
1235 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1236 struct sk_buff *skb)
1237 {
1238 int err = 0;
1239
1240 if (vxlan_get_sk_family(vs) == AF_INET)
1241 err = IP_ECN_decapsulate(oiph, skb);
1242 #if IS_ENABLED(CONFIG_IPV6)
1243 else
1244 err = IP6_ECN_decapsulate(oiph, skb);
1245 #endif
1246
1247 if (unlikely(err) && log_ecn_error) {
1248 if (vxlan_get_sk_family(vs) == AF_INET)
1249 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1250 &((struct iphdr *)oiph)->saddr,
1251 ((struct iphdr *)oiph)->tos);
1252 else
1253 net_info_ratelimited("non-ECT from %pI6\n",
1254 &((struct ipv6hdr *)oiph)->saddr);
1255 }
1256 return err <= 1;
1257 }
1258
1259 /* Callback from net/ipv4/udp.c to receive packets */
1260 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1261 {
1262 struct pcpu_sw_netstats *stats;
1263 struct vxlan_dev *vxlan;
1264 struct vxlan_sock *vs;
1265 struct vxlanhdr unparsed;
1266 struct vxlan_metadata _md;
1267 struct vxlan_metadata *md = &_md;
1268 __be16 protocol = htons(ETH_P_TEB);
1269 bool raw_proto = false;
1270 void *oiph;
1271
1272 /* Need UDP and VXLAN header to be present */
1273 if (!pskb_may_pull(skb, VXLAN_HLEN))
1274 goto drop;
1275
1276 unparsed = *vxlan_hdr(skb);
1277 /* VNI flag always required to be set */
1278 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1279 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1280 ntohl(vxlan_hdr(skb)->vx_flags),
1281 ntohl(vxlan_hdr(skb)->vx_vni));
1282 /* Return non vxlan pkt */
1283 goto drop;
1284 }
1285 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1286 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1287
1288 vs = rcu_dereference_sk_user_data(sk);
1289 if (!vs)
1290 goto drop;
1291
1292 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1293 if (!vxlan)
1294 goto drop;
1295
1296 /* For backwards compatibility, only allow reserved fields to be
1297 * used by VXLAN extensions if explicitly requested.
1298 */
1299 if (vs->flags & VXLAN_F_GPE) {
1300 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1301 goto drop;
1302 raw_proto = true;
1303 }
1304
1305 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1306 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1307 goto drop;
1308
1309 if (vxlan_collect_metadata(vs)) {
1310 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1311 struct metadata_dst *tun_dst;
1312
1313 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1314 key32_to_tunnel_id(vni), sizeof(*md));
1315
1316 if (!tun_dst)
1317 goto drop;
1318
1319 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1320
1321 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1322 } else {
1323 memset(md, 0, sizeof(*md));
1324 }
1325
1326 if (vs->flags & VXLAN_F_REMCSUM_RX)
1327 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1328 goto drop;
1329 if (vs->flags & VXLAN_F_GBP)
1330 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1331 /* Note that GBP and GPE can never be active together. This is
1332 * ensured in vxlan_dev_configure.
1333 */
1334
1335 if (unparsed.vx_flags || unparsed.vx_vni) {
1336 /* If there are any unprocessed flags remaining treat
1337 * this as a malformed packet. This behavior diverges from
1338 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1339 * in reserved fields are to be ignored. The approach here
1340 * maintains compatibility with previous stack code, and also
1341 * is more robust and provides a little more security in
1342 * adding extensions to VXLAN.
1343 */
1344 goto drop;
1345 }
1346
1347 if (!raw_proto) {
1348 if (!vxlan_set_mac(vxlan, vs, skb))
1349 goto drop;
1350 } else {
1351 skb_reset_mac_header(skb);
1352 skb->dev = vxlan->dev;
1353 skb->pkt_type = PACKET_HOST;
1354 }
1355
1356 oiph = skb_network_header(skb);
1357 skb_reset_network_header(skb);
1358
1359 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1360 ++vxlan->dev->stats.rx_frame_errors;
1361 ++vxlan->dev->stats.rx_errors;
1362 goto drop;
1363 }
1364
1365 stats = this_cpu_ptr(vxlan->dev->tstats);
1366 u64_stats_update_begin(&stats->syncp);
1367 stats->rx_packets++;
1368 stats->rx_bytes += skb->len;
1369 u64_stats_update_end(&stats->syncp);
1370
1371 gro_cells_receive(&vxlan->gro_cells, skb);
1372 return 0;
1373
1374 drop:
1375 /* Consume bad packet */
1376 kfree_skb(skb);
1377 return 0;
1378 }
1379
1380 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1381 {
1382 struct vxlan_dev *vxlan = netdev_priv(dev);
1383 struct arphdr *parp;
1384 u8 *arpptr, *sha;
1385 __be32 sip, tip;
1386 struct neighbour *n;
1387
1388 if (dev->flags & IFF_NOARP)
1389 goto out;
1390
1391 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1392 dev->stats.tx_dropped++;
1393 goto out;
1394 }
1395 parp = arp_hdr(skb);
1396
1397 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1398 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1399 parp->ar_pro != htons(ETH_P_IP) ||
1400 parp->ar_op != htons(ARPOP_REQUEST) ||
1401 parp->ar_hln != dev->addr_len ||
1402 parp->ar_pln != 4)
1403 goto out;
1404 arpptr = (u8 *)parp + sizeof(struct arphdr);
1405 sha = arpptr;
1406 arpptr += dev->addr_len; /* sha */
1407 memcpy(&sip, arpptr, sizeof(sip));
1408 arpptr += sizeof(sip);
1409 arpptr += dev->addr_len; /* tha */
1410 memcpy(&tip, arpptr, sizeof(tip));
1411
1412 if (ipv4_is_loopback(tip) ||
1413 ipv4_is_multicast(tip))
1414 goto out;
1415
1416 n = neigh_lookup(&arp_tbl, &tip, dev);
1417
1418 if (n) {
1419 struct vxlan_fdb *f;
1420 struct sk_buff *reply;
1421
1422 if (!(n->nud_state & NUD_CONNECTED)) {
1423 neigh_release(n);
1424 goto out;
1425 }
1426
1427 f = vxlan_find_mac(vxlan, n->ha);
1428 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1429 /* bridge-local neighbor */
1430 neigh_release(n);
1431 goto out;
1432 }
1433
1434 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1435 n->ha, sha);
1436
1437 neigh_release(n);
1438
1439 if (reply == NULL)
1440 goto out;
1441
1442 skb_reset_mac_header(reply);
1443 __skb_pull(reply, skb_network_offset(reply));
1444 reply->ip_summed = CHECKSUM_UNNECESSARY;
1445 reply->pkt_type = PACKET_HOST;
1446
1447 if (netif_rx_ni(reply) == NET_RX_DROP)
1448 dev->stats.rx_dropped++;
1449 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1450 union vxlan_addr ipa = {
1451 .sin.sin_addr.s_addr = tip,
1452 .sin.sin_family = AF_INET,
1453 };
1454
1455 vxlan_ip_miss(dev, &ipa);
1456 }
1457 out:
1458 consume_skb(skb);
1459 return NETDEV_TX_OK;
1460 }
1461
1462 #if IS_ENABLED(CONFIG_IPV6)
1463 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1464 struct neighbour *n, bool isrouter)
1465 {
1466 struct net_device *dev = request->dev;
1467 struct sk_buff *reply;
1468 struct nd_msg *ns, *na;
1469 struct ipv6hdr *pip6;
1470 u8 *daddr;
1471 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1472 int ns_olen;
1473 int i, len;
1474
1475 if (dev == NULL)
1476 return NULL;
1477
1478 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1479 sizeof(*na) + na_olen + dev->needed_tailroom;
1480 reply = alloc_skb(len, GFP_ATOMIC);
1481 if (reply == NULL)
1482 return NULL;
1483
1484 reply->protocol = htons(ETH_P_IPV6);
1485 reply->dev = dev;
1486 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1487 skb_push(reply, sizeof(struct ethhdr));
1488 skb_reset_mac_header(reply);
1489
1490 ns = (struct nd_msg *)skb_transport_header(request);
1491
1492 daddr = eth_hdr(request)->h_source;
1493 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1494 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1495 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1496 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1497 break;
1498 }
1499 }
1500
1501 /* Ethernet header */
1502 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1503 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1504 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1505 reply->protocol = htons(ETH_P_IPV6);
1506
1507 skb_pull(reply, sizeof(struct ethhdr));
1508 skb_reset_network_header(reply);
1509 skb_put(reply, sizeof(struct ipv6hdr));
1510
1511 /* IPv6 header */
1512
1513 pip6 = ipv6_hdr(reply);
1514 memset(pip6, 0, sizeof(struct ipv6hdr));
1515 pip6->version = 6;
1516 pip6->priority = ipv6_hdr(request)->priority;
1517 pip6->nexthdr = IPPROTO_ICMPV6;
1518 pip6->hop_limit = 255;
1519 pip6->daddr = ipv6_hdr(request)->saddr;
1520 pip6->saddr = *(struct in6_addr *)n->primary_key;
1521
1522 skb_pull(reply, sizeof(struct ipv6hdr));
1523 skb_reset_transport_header(reply);
1524
1525 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1526
1527 /* Neighbor Advertisement */
1528 memset(na, 0, sizeof(*na)+na_olen);
1529 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1530 na->icmph.icmp6_router = isrouter;
1531 na->icmph.icmp6_override = 1;
1532 na->icmph.icmp6_solicited = 1;
1533 na->target = ns->target;
1534 ether_addr_copy(&na->opt[2], n->ha);
1535 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1536 na->opt[1] = na_olen >> 3;
1537
1538 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1539 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1540 csum_partial(na, sizeof(*na)+na_olen, 0));
1541
1542 pip6->payload_len = htons(sizeof(*na)+na_olen);
1543
1544 skb_push(reply, sizeof(struct ipv6hdr));
1545
1546 reply->ip_summed = CHECKSUM_UNNECESSARY;
1547
1548 return reply;
1549 }
1550
1551 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1552 {
1553 struct vxlan_dev *vxlan = netdev_priv(dev);
1554 struct nd_msg *msg;
1555 const struct ipv6hdr *iphdr;
1556 const struct in6_addr *saddr, *daddr;
1557 struct neighbour *n;
1558 struct inet6_dev *in6_dev;
1559
1560 in6_dev = __in6_dev_get(dev);
1561 if (!in6_dev)
1562 goto out;
1563
1564 iphdr = ipv6_hdr(skb);
1565 saddr = &iphdr->saddr;
1566 daddr = &iphdr->daddr;
1567
1568 msg = (struct nd_msg *)skb_transport_header(skb);
1569 if (msg->icmph.icmp6_code != 0 ||
1570 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1571 goto out;
1572
1573 if (ipv6_addr_loopback(daddr) ||
1574 ipv6_addr_is_multicast(&msg->target))
1575 goto out;
1576
1577 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1578
1579 if (n) {
1580 struct vxlan_fdb *f;
1581 struct sk_buff *reply;
1582
1583 if (!(n->nud_state & NUD_CONNECTED)) {
1584 neigh_release(n);
1585 goto out;
1586 }
1587
1588 f = vxlan_find_mac(vxlan, n->ha);
1589 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1590 /* bridge-local neighbor */
1591 neigh_release(n);
1592 goto out;
1593 }
1594
1595 reply = vxlan_na_create(skb, n,
1596 !!(f ? f->flags & NTF_ROUTER : 0));
1597
1598 neigh_release(n);
1599
1600 if (reply == NULL)
1601 goto out;
1602
1603 if (netif_rx_ni(reply) == NET_RX_DROP)
1604 dev->stats.rx_dropped++;
1605
1606 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1607 union vxlan_addr ipa = {
1608 .sin6.sin6_addr = msg->target,
1609 .sin6.sin6_family = AF_INET6,
1610 };
1611
1612 vxlan_ip_miss(dev, &ipa);
1613 }
1614
1615 out:
1616 consume_skb(skb);
1617 return NETDEV_TX_OK;
1618 }
1619 #endif
1620
1621 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1622 {
1623 struct vxlan_dev *vxlan = netdev_priv(dev);
1624 struct neighbour *n;
1625
1626 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1627 return false;
1628
1629 n = NULL;
1630 switch (ntohs(eth_hdr(skb)->h_proto)) {
1631 case ETH_P_IP:
1632 {
1633 struct iphdr *pip;
1634
1635 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1636 return false;
1637 pip = ip_hdr(skb);
1638 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1639 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1640 union vxlan_addr ipa = {
1641 .sin.sin_addr.s_addr = pip->daddr,
1642 .sin.sin_family = AF_INET,
1643 };
1644
1645 vxlan_ip_miss(dev, &ipa);
1646 return false;
1647 }
1648
1649 break;
1650 }
1651 #if IS_ENABLED(CONFIG_IPV6)
1652 case ETH_P_IPV6:
1653 {
1654 struct ipv6hdr *pip6;
1655
1656 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1657 return false;
1658 pip6 = ipv6_hdr(skb);
1659 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1660 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1661 union vxlan_addr ipa = {
1662 .sin6.sin6_addr = pip6->daddr,
1663 .sin6.sin6_family = AF_INET6,
1664 };
1665
1666 vxlan_ip_miss(dev, &ipa);
1667 return false;
1668 }
1669
1670 break;
1671 }
1672 #endif
1673 default:
1674 return false;
1675 }
1676
1677 if (n) {
1678 bool diff;
1679
1680 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1681 if (diff) {
1682 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1683 dev->addr_len);
1684 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1685 }
1686 neigh_release(n);
1687 return diff;
1688 }
1689
1690 return false;
1691 }
1692
1693 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1694 struct vxlan_metadata *md)
1695 {
1696 struct vxlanhdr_gbp *gbp;
1697
1698 if (!md->gbp)
1699 return;
1700
1701 gbp = (struct vxlanhdr_gbp *)vxh;
1702 vxh->vx_flags |= VXLAN_HF_GBP;
1703
1704 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1705 gbp->dont_learn = 1;
1706
1707 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1708 gbp->policy_applied = 1;
1709
1710 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1711 }
1712
1713 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1714 __be16 protocol)
1715 {
1716 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1717
1718 gpe->np_applied = 1;
1719
1720 switch (protocol) {
1721 case htons(ETH_P_IP):
1722 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1723 return 0;
1724 case htons(ETH_P_IPV6):
1725 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1726 return 0;
1727 case htons(ETH_P_TEB):
1728 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1729 return 0;
1730 }
1731 return -EPFNOSUPPORT;
1732 }
1733
1734 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1735 int iphdr_len, __be32 vni,
1736 struct vxlan_metadata *md, u32 vxflags,
1737 bool udp_sum)
1738 {
1739 struct vxlanhdr *vxh;
1740 int min_headroom;
1741 int err;
1742 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1743 __be16 inner_protocol = htons(ETH_P_TEB);
1744
1745 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1746 skb->ip_summed == CHECKSUM_PARTIAL) {
1747 int csum_start = skb_checksum_start_offset(skb);
1748
1749 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1750 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1751 (skb->csum_offset == offsetof(struct udphdr, check) ||
1752 skb->csum_offset == offsetof(struct tcphdr, check)))
1753 type |= SKB_GSO_TUNNEL_REMCSUM;
1754 }
1755
1756 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1757 + VXLAN_HLEN + iphdr_len;
1758
1759 /* Need space for new headers (invalidates iph ptr) */
1760 err = skb_cow_head(skb, min_headroom);
1761 if (unlikely(err))
1762 return err;
1763
1764 err = iptunnel_handle_offloads(skb, type);
1765 if (err)
1766 return err;
1767
1768 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1769 vxh->vx_flags = VXLAN_HF_VNI;
1770 vxh->vx_vni = vxlan_vni_field(vni);
1771
1772 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1773 unsigned int start;
1774
1775 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1776 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1777 vxh->vx_flags |= VXLAN_HF_RCO;
1778
1779 if (!skb_is_gso(skb)) {
1780 skb->ip_summed = CHECKSUM_NONE;
1781 skb->encapsulation = 0;
1782 }
1783 }
1784
1785 if (vxflags & VXLAN_F_GBP)
1786 vxlan_build_gbp_hdr(vxh, vxflags, md);
1787 if (vxflags & VXLAN_F_GPE) {
1788 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1789 if (err < 0)
1790 return err;
1791 inner_protocol = skb->protocol;
1792 }
1793
1794 skb_set_inner_protocol(skb, inner_protocol);
1795 return 0;
1796 }
1797
1798 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1799 struct vxlan_sock *sock4,
1800 struct sk_buff *skb, int oif, u8 tos,
1801 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1802 struct dst_cache *dst_cache,
1803 const struct ip_tunnel_info *info)
1804 {
1805 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1806 struct rtable *rt = NULL;
1807 struct flowi4 fl4;
1808
1809 if (!sock4)
1810 return ERR_PTR(-EIO);
1811
1812 if (tos && !info)
1813 use_cache = false;
1814 if (use_cache) {
1815 rt = dst_cache_get_ip4(dst_cache, saddr);
1816 if (rt)
1817 return rt;
1818 }
1819
1820 memset(&fl4, 0, sizeof(fl4));
1821 fl4.flowi4_oif = oif;
1822 fl4.flowi4_tos = RT_TOS(tos);
1823 fl4.flowi4_mark = skb->mark;
1824 fl4.flowi4_proto = IPPROTO_UDP;
1825 fl4.daddr = daddr;
1826 fl4.saddr = *saddr;
1827 fl4.fl4_dport = dport;
1828 fl4.fl4_sport = sport;
1829
1830 rt = ip_route_output_key(vxlan->net, &fl4);
1831 if (likely(!IS_ERR(rt))) {
1832 if (rt->dst.dev == dev) {
1833 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1834 ip_rt_put(rt);
1835 return ERR_PTR(-ELOOP);
1836 }
1837
1838 *saddr = fl4.saddr;
1839 if (use_cache)
1840 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1841 } else {
1842 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1843 return ERR_PTR(-ENETUNREACH);
1844 }
1845 return rt;
1846 }
1847
1848 #if IS_ENABLED(CONFIG_IPV6)
1849 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1850 struct net_device *dev,
1851 struct vxlan_sock *sock6,
1852 struct sk_buff *skb, int oif, u8 tos,
1853 __be32 label,
1854 const struct in6_addr *daddr,
1855 struct in6_addr *saddr,
1856 __be16 dport, __be16 sport,
1857 struct dst_cache *dst_cache,
1858 const struct ip_tunnel_info *info)
1859 {
1860 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1861 struct dst_entry *ndst;
1862 struct flowi6 fl6;
1863 int err;
1864
1865 if (!sock6)
1866 return ERR_PTR(-EIO);
1867
1868 if (tos && !info)
1869 use_cache = false;
1870 if (use_cache) {
1871 ndst = dst_cache_get_ip6(dst_cache, saddr);
1872 if (ndst)
1873 return ndst;
1874 }
1875
1876 memset(&fl6, 0, sizeof(fl6));
1877 fl6.flowi6_oif = oif;
1878 fl6.daddr = *daddr;
1879 fl6.saddr = *saddr;
1880 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1881 fl6.flowi6_mark = skb->mark;
1882 fl6.flowi6_proto = IPPROTO_UDP;
1883 fl6.fl6_dport = dport;
1884 fl6.fl6_sport = sport;
1885
1886 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1887 sock6->sock->sk,
1888 &ndst, &fl6);
1889 if (unlikely(err < 0)) {
1890 netdev_dbg(dev, "no route to %pI6\n", daddr);
1891 return ERR_PTR(-ENETUNREACH);
1892 }
1893
1894 if (unlikely(ndst->dev == dev)) {
1895 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1896 dst_release(ndst);
1897 return ERR_PTR(-ELOOP);
1898 }
1899
1900 *saddr = fl6.saddr;
1901 if (use_cache)
1902 dst_cache_set_ip6(dst_cache, ndst, saddr);
1903 return ndst;
1904 }
1905 #endif
1906
1907 /* Bypass encapsulation if the destination is local */
1908 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1909 struct vxlan_dev *dst_vxlan)
1910 {
1911 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1912 union vxlan_addr loopback;
1913 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1914 struct net_device *dev = skb->dev;
1915 int len = skb->len;
1916
1917 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1918 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1919 skb->pkt_type = PACKET_HOST;
1920 skb->encapsulation = 0;
1921 skb->dev = dst_vxlan->dev;
1922 __skb_pull(skb, skb_network_offset(skb));
1923
1924 if (remote_ip->sa.sa_family == AF_INET) {
1925 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1926 loopback.sa.sa_family = AF_INET;
1927 #if IS_ENABLED(CONFIG_IPV6)
1928 } else {
1929 loopback.sin6.sin6_addr = in6addr_loopback;
1930 loopback.sa.sa_family = AF_INET6;
1931 #endif
1932 }
1933
1934 if (dst_vxlan->flags & VXLAN_F_LEARN)
1935 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1936
1937 u64_stats_update_begin(&tx_stats->syncp);
1938 tx_stats->tx_packets++;
1939 tx_stats->tx_bytes += len;
1940 u64_stats_update_end(&tx_stats->syncp);
1941
1942 if (netif_rx(skb) == NET_RX_SUCCESS) {
1943 u64_stats_update_begin(&rx_stats->syncp);
1944 rx_stats->rx_packets++;
1945 rx_stats->rx_bytes += len;
1946 u64_stats_update_end(&rx_stats->syncp);
1947 } else {
1948 dev->stats.rx_dropped++;
1949 }
1950 }
1951
1952 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
1953 struct vxlan_dev *vxlan, union vxlan_addr *daddr,
1954 __be32 dst_port, __be32 vni, struct dst_entry *dst,
1955 u32 rt_flags)
1956 {
1957 #if IS_ENABLED(CONFIG_IPV6)
1958 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
1959 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
1960 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
1961 */
1962 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
1963 #endif
1964 /* Bypass encapsulation if the destination is local */
1965 if (rt_flags & RTCF_LOCAL &&
1966 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1967 struct vxlan_dev *dst_vxlan;
1968
1969 dst_release(dst);
1970 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1971 daddr->sa.sa_family, dst_port,
1972 vxlan->flags);
1973 if (!dst_vxlan) {
1974 dev->stats.tx_errors++;
1975 kfree_skb(skb);
1976
1977 return -ENOENT;
1978 }
1979 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1980 return 1;
1981 }
1982
1983 return 0;
1984 }
1985
1986 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1987 struct vxlan_rdst *rdst, bool did_rsc)
1988 {
1989 struct dst_cache *dst_cache;
1990 struct ip_tunnel_info *info;
1991 struct vxlan_dev *vxlan = netdev_priv(dev);
1992 const struct iphdr *old_iph = ip_hdr(skb);
1993 union vxlan_addr *dst;
1994 union vxlan_addr remote_ip, local_ip;
1995 union vxlan_addr *src;
1996 struct vxlan_metadata _md;
1997 struct vxlan_metadata *md = &_md;
1998 __be16 src_port = 0, dst_port;
1999 struct dst_entry *ndst = NULL;
2000 __be32 vni, label;
2001 __u8 tos, ttl;
2002 int err;
2003 u32 flags = vxlan->flags;
2004 bool udp_sum = false;
2005 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2006
2007 info = skb_tunnel_info(skb);
2008
2009 if (rdst) {
2010 dst = &rdst->remote_ip;
2011 if (vxlan_addr_any(dst)) {
2012 if (did_rsc) {
2013 /* short-circuited back to local bridge */
2014 vxlan_encap_bypass(skb, vxlan, vxlan);
2015 return;
2016 }
2017 goto drop;
2018 }
2019
2020 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2021 vni = rdst->remote_vni;
2022 src = &vxlan->cfg.saddr;
2023 dst_cache = &rdst->dst_cache;
2024 md->gbp = skb->mark;
2025 ttl = vxlan->cfg.ttl;
2026 if (!ttl && vxlan_addr_multicast(dst))
2027 ttl = 1;
2028
2029 tos = vxlan->cfg.tos;
2030 if (tos == 1)
2031 tos = ip_tunnel_get_dsfield(old_iph, skb);
2032
2033 if (dst->sa.sa_family == AF_INET)
2034 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2035 else
2036 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2037 label = vxlan->cfg.label;
2038 } else {
2039 if (!info) {
2040 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2041 dev->name);
2042 goto drop;
2043 }
2044 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2045 if (remote_ip.sa.sa_family == AF_INET) {
2046 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2047 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2048 } else {
2049 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2050 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2051 }
2052 dst = &remote_ip;
2053 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2054 vni = tunnel_id_to_key32(info->key.tun_id);
2055 src = &local_ip;
2056 dst_cache = &info->dst_cache;
2057 if (info->options_len)
2058 md = ip_tunnel_info_opts(info);
2059 ttl = info->key.ttl;
2060 tos = info->key.tos;
2061 label = info->key.label;
2062 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2063 }
2064 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2065 vxlan->cfg.port_max, true);
2066
2067 if (dst->sa.sa_family == AF_INET) {
2068 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2069 struct rtable *rt;
2070 __be16 df = 0;
2071
2072 rt = vxlan_get_route(vxlan, dev, sock4, skb,
2073 rdst ? rdst->remote_ifindex : 0, tos,
2074 dst->sin.sin_addr.s_addr,
2075 &src->sin.sin_addr.s_addr,
2076 dst_port, src_port,
2077 dst_cache, info);
2078 if (IS_ERR(rt)) {
2079 err = PTR_ERR(rt);
2080 goto tx_error;
2081 }
2082
2083 /* Bypass encapsulation if the destination is local */
2084 if (!info) {
2085 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2086 dst_port, vni, &rt->dst,
2087 rt->rt_flags);
2088 if (err)
2089 return;
2090 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2091 df = htons(IP_DF);
2092 }
2093
2094 ndst = &rt->dst;
2095 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2096 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2097 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2098 vni, md, flags, udp_sum);
2099 if (err < 0)
2100 goto tx_error;
2101
2102 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, src->sin.sin_addr.s_addr,
2103 dst->sin.sin_addr.s_addr, tos, ttl, df,
2104 src_port, dst_port, xnet, !udp_sum);
2105 #if IS_ENABLED(CONFIG_IPV6)
2106 } else {
2107 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2108
2109 ndst = vxlan6_get_route(vxlan, dev, sock6, skb,
2110 rdst ? rdst->remote_ifindex : 0, tos,
2111 label, &dst->sin6.sin6_addr,
2112 &src->sin6.sin6_addr,
2113 dst_port, src_port,
2114 dst_cache, info);
2115 if (IS_ERR(ndst)) {
2116 err = PTR_ERR(ndst);
2117 ndst = NULL;
2118 goto tx_error;
2119 }
2120
2121 if (!info) {
2122 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2123
2124 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2125 dst_port, vni, ndst,
2126 rt6i_flags);
2127 if (err)
2128 return;
2129 }
2130
2131 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2132 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2133 skb_scrub_packet(skb, xnet);
2134 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2135 vni, md, flags, udp_sum);
2136 if (err < 0)
2137 goto tx_error;
2138
2139 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2140 &src->sin6.sin6_addr,
2141 &dst->sin6.sin6_addr, tos, ttl,
2142 label, src_port, dst_port, !udp_sum);
2143 #endif
2144 }
2145 return;
2146
2147 drop:
2148 dev->stats.tx_dropped++;
2149 dev_kfree_skb(skb);
2150 return;
2151
2152 tx_error:
2153 if (err == -ELOOP)
2154 dev->stats.collisions++;
2155 else if (err == -ENETUNREACH)
2156 dev->stats.tx_carrier_errors++;
2157 dst_release(ndst);
2158 dev->stats.tx_errors++;
2159 kfree_skb(skb);
2160 }
2161
2162 /* Transmit local packets over Vxlan
2163 *
2164 * Outer IP header inherits ECN and DF from inner header.
2165 * Outer UDP destination is the VXLAN assigned port.
2166 * source port is based on hash of flow
2167 */
2168 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2169 {
2170 struct vxlan_dev *vxlan = netdev_priv(dev);
2171 const struct ip_tunnel_info *info;
2172 struct ethhdr *eth;
2173 bool did_rsc = false;
2174 struct vxlan_rdst *rdst, *fdst = NULL;
2175 struct vxlan_fdb *f;
2176
2177 info = skb_tunnel_info(skb);
2178
2179 skb_reset_mac_header(skb);
2180
2181 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2182 if (info && info->mode & IP_TUNNEL_INFO_TX)
2183 vxlan_xmit_one(skb, dev, NULL, false);
2184 else
2185 kfree_skb(skb);
2186 return NETDEV_TX_OK;
2187 }
2188
2189 if (vxlan->flags & VXLAN_F_PROXY) {
2190 eth = eth_hdr(skb);
2191 if (ntohs(eth->h_proto) == ETH_P_ARP)
2192 return arp_reduce(dev, skb);
2193 #if IS_ENABLED(CONFIG_IPV6)
2194 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2195 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2196 + sizeof(struct nd_msg)) &&
2197 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2198 struct nd_msg *msg;
2199
2200 msg = (struct nd_msg *)skb_transport_header(skb);
2201 if (msg->icmph.icmp6_code == 0 &&
2202 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2203 return neigh_reduce(dev, skb);
2204 }
2205 #endif
2206 }
2207
2208 eth = eth_hdr(skb);
2209 f = vxlan_find_mac(vxlan, eth->h_dest);
2210 did_rsc = false;
2211
2212 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2213 (ntohs(eth->h_proto) == ETH_P_IP ||
2214 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2215 did_rsc = route_shortcircuit(dev, skb);
2216 if (did_rsc)
2217 f = vxlan_find_mac(vxlan, eth->h_dest);
2218 }
2219
2220 if (f == NULL) {
2221 f = vxlan_find_mac(vxlan, all_zeros_mac);
2222 if (f == NULL) {
2223 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2224 !is_multicast_ether_addr(eth->h_dest))
2225 vxlan_fdb_miss(vxlan, eth->h_dest);
2226
2227 dev->stats.tx_dropped++;
2228 kfree_skb(skb);
2229 return NETDEV_TX_OK;
2230 }
2231 }
2232
2233 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2234 struct sk_buff *skb1;
2235
2236 if (!fdst) {
2237 fdst = rdst;
2238 continue;
2239 }
2240 skb1 = skb_clone(skb, GFP_ATOMIC);
2241 if (skb1)
2242 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2243 }
2244
2245 if (fdst)
2246 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2247 else
2248 kfree_skb(skb);
2249 return NETDEV_TX_OK;
2250 }
2251
2252 /* Walk the forwarding table and purge stale entries */
2253 static void vxlan_cleanup(unsigned long arg)
2254 {
2255 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2256 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2257 unsigned int h;
2258
2259 if (!netif_running(vxlan->dev))
2260 return;
2261
2262 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2263 struct hlist_node *p, *n;
2264
2265 spin_lock_bh(&vxlan->hash_lock);
2266 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2267 struct vxlan_fdb *f
2268 = container_of(p, struct vxlan_fdb, hlist);
2269 unsigned long timeout;
2270
2271 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2272 continue;
2273
2274 timeout = f->used + vxlan->cfg.age_interval * HZ;
2275 if (time_before_eq(timeout, jiffies)) {
2276 netdev_dbg(vxlan->dev,
2277 "garbage collect %pM\n",
2278 f->eth_addr);
2279 f->state = NUD_STALE;
2280 vxlan_fdb_destroy(vxlan, f);
2281 } else if (time_before(timeout, next_timer))
2282 next_timer = timeout;
2283 }
2284 spin_unlock_bh(&vxlan->hash_lock);
2285 }
2286
2287 mod_timer(&vxlan->age_timer, next_timer);
2288 }
2289
2290 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2291 {
2292 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2293 __be32 vni = vxlan->default_dst.remote_vni;
2294
2295 spin_lock(&vn->sock_lock);
2296 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2297 spin_unlock(&vn->sock_lock);
2298 }
2299
2300 /* Setup stats when device is created */
2301 static int vxlan_init(struct net_device *dev)
2302 {
2303 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2304 if (!dev->tstats)
2305 return -ENOMEM;
2306
2307 return 0;
2308 }
2309
2310 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2311 {
2312 struct vxlan_fdb *f;
2313
2314 spin_lock_bh(&vxlan->hash_lock);
2315 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2316 if (f)
2317 vxlan_fdb_destroy(vxlan, f);
2318 spin_unlock_bh(&vxlan->hash_lock);
2319 }
2320
2321 static void vxlan_uninit(struct net_device *dev)
2322 {
2323 struct vxlan_dev *vxlan = netdev_priv(dev);
2324
2325 vxlan_fdb_delete_default(vxlan);
2326
2327 free_percpu(dev->tstats);
2328 }
2329
2330 /* Start ageing timer and join group when device is brought up */
2331 static int vxlan_open(struct net_device *dev)
2332 {
2333 struct vxlan_dev *vxlan = netdev_priv(dev);
2334 int ret;
2335
2336 ret = vxlan_sock_add(vxlan);
2337 if (ret < 0)
2338 return ret;
2339
2340 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2341 ret = vxlan_igmp_join(vxlan);
2342 if (ret == -EADDRINUSE)
2343 ret = 0;
2344 if (ret) {
2345 vxlan_sock_release(vxlan);
2346 return ret;
2347 }
2348 }
2349
2350 if (vxlan->cfg.age_interval)
2351 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2352
2353 return ret;
2354 }
2355
2356 /* Purge the forwarding table */
2357 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2358 {
2359 unsigned int h;
2360
2361 spin_lock_bh(&vxlan->hash_lock);
2362 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2363 struct hlist_node *p, *n;
2364 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2365 struct vxlan_fdb *f
2366 = container_of(p, struct vxlan_fdb, hlist);
2367 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2368 continue;
2369 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2370 if (!is_zero_ether_addr(f->eth_addr))
2371 vxlan_fdb_destroy(vxlan, f);
2372 }
2373 }
2374 spin_unlock_bh(&vxlan->hash_lock);
2375 }
2376
2377 /* Cleanup timer and forwarding table on shutdown */
2378 static int vxlan_stop(struct net_device *dev)
2379 {
2380 struct vxlan_dev *vxlan = netdev_priv(dev);
2381 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2382 int ret = 0;
2383
2384 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2385 !vxlan_group_used(vn, vxlan))
2386 ret = vxlan_igmp_leave(vxlan);
2387
2388 del_timer_sync(&vxlan->age_timer);
2389
2390 vxlan_flush(vxlan, false);
2391 vxlan_sock_release(vxlan);
2392
2393 return ret;
2394 }
2395
2396 /* Stub, nothing needs to be done. */
2397 static void vxlan_set_multicast_list(struct net_device *dev)
2398 {
2399 }
2400
2401 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2402 {
2403 struct vxlan_dev *vxlan = netdev_priv(dev);
2404 struct vxlan_rdst *dst = &vxlan->default_dst;
2405 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2406 dst->remote_ifindex);
2407 bool use_ipv6 = false;
2408
2409 if (dst->remote_ip.sa.sa_family == AF_INET6)
2410 use_ipv6 = true;
2411
2412 /* This check is different than dev->max_mtu, because it looks at
2413 * the lowerdev->mtu, rather than the static dev->max_mtu
2414 */
2415 if (lowerdev) {
2416 int max_mtu = lowerdev->mtu -
2417 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2418 if (new_mtu > max_mtu)
2419 return -EINVAL;
2420 }
2421
2422 dev->mtu = new_mtu;
2423 return 0;
2424 }
2425
2426 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2427 {
2428 struct vxlan_dev *vxlan = netdev_priv(dev);
2429 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2430 __be16 sport, dport;
2431
2432 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2433 vxlan->cfg.port_max, true);
2434 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2435
2436 if (ip_tunnel_info_af(info) == AF_INET) {
2437 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2438 struct rtable *rt;
2439
2440 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2441 info->key.u.ipv4.dst,
2442 &info->key.u.ipv4.src, dport, sport, NULL, info);
2443 if (IS_ERR(rt))
2444 return PTR_ERR(rt);
2445 ip_rt_put(rt);
2446 } else {
2447 #if IS_ENABLED(CONFIG_IPV6)
2448 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2449 struct dst_entry *ndst;
2450
2451 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2452 info->key.label, &info->key.u.ipv6.dst,
2453 &info->key.u.ipv6.src, dport, sport, NULL, info);
2454 if (IS_ERR(ndst))
2455 return PTR_ERR(ndst);
2456 dst_release(ndst);
2457 #else /* !CONFIG_IPV6 */
2458 return -EPFNOSUPPORT;
2459 #endif
2460 }
2461 info->key.tp_src = sport;
2462 info->key.tp_dst = dport;
2463 return 0;
2464 }
2465
2466 static const struct net_device_ops vxlan_netdev_ether_ops = {
2467 .ndo_init = vxlan_init,
2468 .ndo_uninit = vxlan_uninit,
2469 .ndo_open = vxlan_open,
2470 .ndo_stop = vxlan_stop,
2471 .ndo_start_xmit = vxlan_xmit,
2472 .ndo_get_stats64 = ip_tunnel_get_stats64,
2473 .ndo_set_rx_mode = vxlan_set_multicast_list,
2474 .ndo_change_mtu = vxlan_change_mtu,
2475 .ndo_validate_addr = eth_validate_addr,
2476 .ndo_set_mac_address = eth_mac_addr,
2477 .ndo_fdb_add = vxlan_fdb_add,
2478 .ndo_fdb_del = vxlan_fdb_delete,
2479 .ndo_fdb_dump = vxlan_fdb_dump,
2480 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2481 };
2482
2483 static const struct net_device_ops vxlan_netdev_raw_ops = {
2484 .ndo_init = vxlan_init,
2485 .ndo_uninit = vxlan_uninit,
2486 .ndo_open = vxlan_open,
2487 .ndo_stop = vxlan_stop,
2488 .ndo_start_xmit = vxlan_xmit,
2489 .ndo_get_stats64 = ip_tunnel_get_stats64,
2490 .ndo_change_mtu = vxlan_change_mtu,
2491 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2492 };
2493
2494 /* Info for udev, that this is a virtual tunnel endpoint */
2495 static struct device_type vxlan_type = {
2496 .name = "vxlan",
2497 };
2498
2499 /* Calls the ndo_udp_tunnel_add of the caller in order to
2500 * supply the listening VXLAN udp ports. Callers are expected
2501 * to implement the ndo_udp_tunnel_add.
2502 */
2503 static void vxlan_push_rx_ports(struct net_device *dev)
2504 {
2505 struct vxlan_sock *vs;
2506 struct net *net = dev_net(dev);
2507 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2508 unsigned int i;
2509
2510 spin_lock(&vn->sock_lock);
2511 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2512 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2513 udp_tunnel_push_rx_port(dev, vs->sock,
2514 (vs->flags & VXLAN_F_GPE) ?
2515 UDP_TUNNEL_TYPE_VXLAN_GPE :
2516 UDP_TUNNEL_TYPE_VXLAN);
2517 }
2518 spin_unlock(&vn->sock_lock);
2519 }
2520
2521 /* Initialize the device structure. */
2522 static void vxlan_setup(struct net_device *dev)
2523 {
2524 struct vxlan_dev *vxlan = netdev_priv(dev);
2525 unsigned int h;
2526
2527 eth_hw_addr_random(dev);
2528 ether_setup(dev);
2529
2530 dev->destructor = free_netdev;
2531 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2532
2533 dev->features |= NETIF_F_LLTX;
2534 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2535 dev->features |= NETIF_F_RXCSUM;
2536 dev->features |= NETIF_F_GSO_SOFTWARE;
2537
2538 dev->vlan_features = dev->features;
2539 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2540 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2541 netif_keep_dst(dev);
2542 dev->priv_flags |= IFF_NO_QUEUE;
2543
2544 INIT_LIST_HEAD(&vxlan->next);
2545 spin_lock_init(&vxlan->hash_lock);
2546
2547 init_timer_deferrable(&vxlan->age_timer);
2548 vxlan->age_timer.function = vxlan_cleanup;
2549 vxlan->age_timer.data = (unsigned long) vxlan;
2550
2551 vxlan->cfg.dst_port = htons(vxlan_port);
2552
2553 vxlan->dev = dev;
2554
2555 gro_cells_init(&vxlan->gro_cells, dev);
2556
2557 for (h = 0; h < FDB_HASH_SIZE; ++h)
2558 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2559 }
2560
2561 static void vxlan_ether_setup(struct net_device *dev)
2562 {
2563 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2564 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2565 dev->netdev_ops = &vxlan_netdev_ether_ops;
2566 }
2567
2568 static void vxlan_raw_setup(struct net_device *dev)
2569 {
2570 dev->header_ops = NULL;
2571 dev->type = ARPHRD_NONE;
2572 dev->hard_header_len = 0;
2573 dev->addr_len = 0;
2574 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2575 dev->netdev_ops = &vxlan_netdev_raw_ops;
2576 }
2577
2578 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2579 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2580 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2581 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2582 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2583 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2584 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2585 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2586 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2587 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2588 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2589 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2590 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2591 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2592 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2593 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2594 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2595 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2596 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2597 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2598 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2599 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2600 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2601 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2602 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2603 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2604 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2605 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2606 };
2607
2608 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2609 {
2610 if (tb[IFLA_ADDRESS]) {
2611 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2612 pr_debug("invalid link address (not ethernet)\n");
2613 return -EINVAL;
2614 }
2615
2616 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2617 pr_debug("invalid all zero ethernet address\n");
2618 return -EADDRNOTAVAIL;
2619 }
2620 }
2621
2622 if (!data)
2623 return -EINVAL;
2624
2625 if (data[IFLA_VXLAN_ID]) {
2626 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2627 if (id >= VXLAN_VID_MASK)
2628 return -ERANGE;
2629 }
2630
2631 if (data[IFLA_VXLAN_PORT_RANGE]) {
2632 const struct ifla_vxlan_port_range *p
2633 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2634
2635 if (ntohs(p->high) < ntohs(p->low)) {
2636 pr_debug("port range %u .. %u not valid\n",
2637 ntohs(p->low), ntohs(p->high));
2638 return -EINVAL;
2639 }
2640 }
2641
2642 return 0;
2643 }
2644
2645 static void vxlan_get_drvinfo(struct net_device *netdev,
2646 struct ethtool_drvinfo *drvinfo)
2647 {
2648 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2649 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2650 }
2651
2652 static const struct ethtool_ops vxlan_ethtool_ops = {
2653 .get_drvinfo = vxlan_get_drvinfo,
2654 .get_link = ethtool_op_get_link,
2655 };
2656
2657 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2658 __be16 port, u32 flags)
2659 {
2660 struct socket *sock;
2661 struct udp_port_cfg udp_conf;
2662 int err;
2663
2664 memset(&udp_conf, 0, sizeof(udp_conf));
2665
2666 if (ipv6) {
2667 udp_conf.family = AF_INET6;
2668 udp_conf.use_udp6_rx_checksums =
2669 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2670 udp_conf.ipv6_v6only = 1;
2671 } else {
2672 udp_conf.family = AF_INET;
2673 }
2674
2675 udp_conf.local_udp_port = port;
2676
2677 /* Open UDP socket */
2678 err = udp_sock_create(net, &udp_conf, &sock);
2679 if (err < 0)
2680 return ERR_PTR(err);
2681
2682 return sock;
2683 }
2684
2685 /* Create new listen socket if needed */
2686 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2687 __be16 port, u32 flags)
2688 {
2689 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2690 struct vxlan_sock *vs;
2691 struct socket *sock;
2692 unsigned int h;
2693 struct udp_tunnel_sock_cfg tunnel_cfg;
2694
2695 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2696 if (!vs)
2697 return ERR_PTR(-ENOMEM);
2698
2699 for (h = 0; h < VNI_HASH_SIZE; ++h)
2700 INIT_HLIST_HEAD(&vs->vni_list[h]);
2701
2702 sock = vxlan_create_sock(net, ipv6, port, flags);
2703 if (IS_ERR(sock)) {
2704 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2705 PTR_ERR(sock));
2706 kfree(vs);
2707 return ERR_CAST(sock);
2708 }
2709
2710 vs->sock = sock;
2711 atomic_set(&vs->refcnt, 1);
2712 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2713
2714 spin_lock(&vn->sock_lock);
2715 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2716 udp_tunnel_notify_add_rx_port(sock,
2717 (vs->flags & VXLAN_F_GPE) ?
2718 UDP_TUNNEL_TYPE_VXLAN_GPE :
2719 UDP_TUNNEL_TYPE_VXLAN);
2720 spin_unlock(&vn->sock_lock);
2721
2722 /* Mark socket as an encapsulation socket. */
2723 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2724 tunnel_cfg.sk_user_data = vs;
2725 tunnel_cfg.encap_type = 1;
2726 tunnel_cfg.encap_rcv = vxlan_rcv;
2727 tunnel_cfg.encap_destroy = NULL;
2728 tunnel_cfg.gro_receive = vxlan_gro_receive;
2729 tunnel_cfg.gro_complete = vxlan_gro_complete;
2730
2731 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2732
2733 return vs;
2734 }
2735
2736 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2737 {
2738 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2739 struct vxlan_sock *vs = NULL;
2740
2741 if (!vxlan->cfg.no_share) {
2742 spin_lock(&vn->sock_lock);
2743 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2744 vxlan->cfg.dst_port, vxlan->flags);
2745 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2746 spin_unlock(&vn->sock_lock);
2747 return -EBUSY;
2748 }
2749 spin_unlock(&vn->sock_lock);
2750 }
2751 if (!vs)
2752 vs = vxlan_socket_create(vxlan->net, ipv6,
2753 vxlan->cfg.dst_port, vxlan->flags);
2754 if (IS_ERR(vs))
2755 return PTR_ERR(vs);
2756 #if IS_ENABLED(CONFIG_IPV6)
2757 if (ipv6)
2758 rcu_assign_pointer(vxlan->vn6_sock, vs);
2759 else
2760 #endif
2761 rcu_assign_pointer(vxlan->vn4_sock, vs);
2762 vxlan_vs_add_dev(vs, vxlan);
2763 return 0;
2764 }
2765
2766 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2767 {
2768 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2769 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2770 int ret = 0;
2771
2772 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2773 #if IS_ENABLED(CONFIG_IPV6)
2774 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2775 if (ipv6 || metadata)
2776 ret = __vxlan_sock_add(vxlan, true);
2777 #endif
2778 if (!ret && (!ipv6 || metadata))
2779 ret = __vxlan_sock_add(vxlan, false);
2780 if (ret < 0)
2781 vxlan_sock_release(vxlan);
2782 return ret;
2783 }
2784
2785 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2786 struct vxlan_config *conf)
2787 {
2788 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2789 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2790 struct vxlan_rdst *dst = &vxlan->default_dst;
2791 unsigned short needed_headroom = ETH_HLEN;
2792 int err;
2793 bool use_ipv6 = false;
2794 __be16 default_port = vxlan->cfg.dst_port;
2795 struct net_device *lowerdev = NULL;
2796
2797 if (conf->flags & VXLAN_F_GPE) {
2798 /* For now, allow GPE only together with COLLECT_METADATA.
2799 * This can be relaxed later; in such case, the other side
2800 * of the PtP link will have to be provided.
2801 */
2802 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2803 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2804 pr_info("unsupported combination of extensions\n");
2805 return -EINVAL;
2806 }
2807
2808 vxlan_raw_setup(dev);
2809 } else {
2810 vxlan_ether_setup(dev);
2811 }
2812
2813 /* MTU range: 68 - 65535 */
2814 dev->min_mtu = ETH_MIN_MTU;
2815 dev->max_mtu = ETH_MAX_MTU;
2816
2817 vxlan->net = src_net;
2818
2819 dst->remote_vni = conf->vni;
2820
2821 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2822
2823 /* Unless IPv6 is explicitly requested, assume IPv4 */
2824 if (!dst->remote_ip.sa.sa_family)
2825 dst->remote_ip.sa.sa_family = AF_INET;
2826
2827 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2828 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2829 if (!IS_ENABLED(CONFIG_IPV6))
2830 return -EPFNOSUPPORT;
2831 use_ipv6 = true;
2832 vxlan->flags |= VXLAN_F_IPV6;
2833 }
2834
2835 if (conf->label && !use_ipv6) {
2836 pr_info("label only supported in use with IPv6\n");
2837 return -EINVAL;
2838 }
2839
2840 if (conf->remote_ifindex) {
2841 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2842 dst->remote_ifindex = conf->remote_ifindex;
2843
2844 if (!lowerdev) {
2845 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2846 return -ENODEV;
2847 }
2848
2849 #if IS_ENABLED(CONFIG_IPV6)
2850 if (use_ipv6) {
2851 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2852 if (idev && idev->cnf.disable_ipv6) {
2853 pr_info("IPv6 is disabled via sysctl\n");
2854 return -EPERM;
2855 }
2856 }
2857 #endif
2858
2859 if (!conf->mtu)
2860 dev->mtu = lowerdev->mtu -
2861 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2862
2863 needed_headroom = lowerdev->hard_header_len;
2864 } else if (vxlan_addr_multicast(&dst->remote_ip)) {
2865 pr_info("multicast destination requires interface to be specified\n");
2866 return -EINVAL;
2867 }
2868
2869 if (conf->mtu) {
2870 int max_mtu = ETH_MAX_MTU;
2871
2872 if (lowerdev)
2873 max_mtu = lowerdev->mtu;
2874
2875 max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2876
2877 if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
2878 return -EINVAL;
2879
2880 dev->mtu = conf->mtu;
2881
2882 if (conf->mtu > max_mtu)
2883 dev->mtu = max_mtu;
2884 }
2885
2886 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2887 needed_headroom += VXLAN6_HEADROOM;
2888 else
2889 needed_headroom += VXLAN_HEADROOM;
2890 dev->needed_headroom = needed_headroom;
2891
2892 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2893 if (!vxlan->cfg.dst_port) {
2894 if (conf->flags & VXLAN_F_GPE)
2895 vxlan->cfg.dst_port = htons(4790); /* IANA VXLAN-GPE port */
2896 else
2897 vxlan->cfg.dst_port = default_port;
2898 }
2899 vxlan->flags |= conf->flags;
2900
2901 if (!vxlan->cfg.age_interval)
2902 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2903
2904 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2905 if (tmp->cfg.vni == conf->vni &&
2906 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2907 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2908 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2909 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2910 (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
2911 pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
2912 return -EEXIST;
2913 }
2914 }
2915
2916 dev->ethtool_ops = &vxlan_ethtool_ops;
2917
2918 /* create an fdb entry for a valid default destination */
2919 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2920 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2921 &vxlan->default_dst.remote_ip,
2922 NUD_REACHABLE|NUD_PERMANENT,
2923 NLM_F_EXCL|NLM_F_CREATE,
2924 vxlan->cfg.dst_port,
2925 vxlan->default_dst.remote_vni,
2926 vxlan->default_dst.remote_ifindex,
2927 NTF_SELF);
2928 if (err)
2929 return err;
2930 }
2931
2932 err = register_netdevice(dev);
2933 if (err) {
2934 vxlan_fdb_delete_default(vxlan);
2935 return err;
2936 }
2937
2938 list_add(&vxlan->next, &vn->vxlan_list);
2939
2940 return 0;
2941 }
2942
2943 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2944 struct nlattr *tb[], struct nlattr *data[])
2945 {
2946 struct vxlan_config conf;
2947
2948 memset(&conf, 0, sizeof(conf));
2949
2950 if (data[IFLA_VXLAN_ID])
2951 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2952
2953 if (data[IFLA_VXLAN_GROUP]) {
2954 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2955 } else if (data[IFLA_VXLAN_GROUP6]) {
2956 if (!IS_ENABLED(CONFIG_IPV6))
2957 return -EPFNOSUPPORT;
2958
2959 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2960 conf.remote_ip.sa.sa_family = AF_INET6;
2961 }
2962
2963 if (data[IFLA_VXLAN_LOCAL]) {
2964 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2965 conf.saddr.sa.sa_family = AF_INET;
2966 } else if (data[IFLA_VXLAN_LOCAL6]) {
2967 if (!IS_ENABLED(CONFIG_IPV6))
2968 return -EPFNOSUPPORT;
2969
2970 /* TODO: respect scope id */
2971 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2972 conf.saddr.sa.sa_family = AF_INET6;
2973 }
2974
2975 if (data[IFLA_VXLAN_LINK])
2976 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2977
2978 if (data[IFLA_VXLAN_TOS])
2979 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2980
2981 if (data[IFLA_VXLAN_TTL])
2982 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2983
2984 if (data[IFLA_VXLAN_LABEL])
2985 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2986 IPV6_FLOWLABEL_MASK;
2987
2988 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2989 conf.flags |= VXLAN_F_LEARN;
2990
2991 if (data[IFLA_VXLAN_AGEING])
2992 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2993
2994 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2995 conf.flags |= VXLAN_F_PROXY;
2996
2997 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2998 conf.flags |= VXLAN_F_RSC;
2999
3000 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3001 conf.flags |= VXLAN_F_L2MISS;
3002
3003 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3004 conf.flags |= VXLAN_F_L3MISS;
3005
3006 if (data[IFLA_VXLAN_LIMIT])
3007 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3008
3009 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3010 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3011 conf.flags |= VXLAN_F_COLLECT_METADATA;
3012
3013 if (data[IFLA_VXLAN_PORT_RANGE]) {
3014 const struct ifla_vxlan_port_range *p
3015 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3016 conf.port_min = ntohs(p->low);
3017 conf.port_max = ntohs(p->high);
3018 }
3019
3020 if (data[IFLA_VXLAN_PORT])
3021 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3022
3023 if (data[IFLA_VXLAN_UDP_CSUM] &&
3024 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3025 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3026
3027 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3028 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3029 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3030
3031 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3032 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3033 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3034
3035 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3036 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3037 conf.flags |= VXLAN_F_REMCSUM_TX;
3038
3039 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3040 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3041 conf.flags |= VXLAN_F_REMCSUM_RX;
3042
3043 if (data[IFLA_VXLAN_GBP])
3044 conf.flags |= VXLAN_F_GBP;
3045
3046 if (data[IFLA_VXLAN_GPE])
3047 conf.flags |= VXLAN_F_GPE;
3048
3049 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3050 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3051
3052 if (tb[IFLA_MTU])
3053 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3054
3055 return vxlan_dev_configure(src_net, dev, &conf);
3056 }
3057
3058 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3059 {
3060 struct vxlan_dev *vxlan = netdev_priv(dev);
3061 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3062
3063 vxlan_flush(vxlan, true);
3064
3065 spin_lock(&vn->sock_lock);
3066 if (!hlist_unhashed(&vxlan->hlist))
3067 hlist_del_rcu(&vxlan->hlist);
3068 spin_unlock(&vn->sock_lock);
3069
3070 gro_cells_destroy(&vxlan->gro_cells);
3071 list_del(&vxlan->next);
3072 unregister_netdevice_queue(dev, head);
3073 }
3074
3075 static size_t vxlan_get_size(const struct net_device *dev)
3076 {
3077
3078 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3079 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3080 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3081 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3082 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3083 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3084 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3085 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3086 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3087 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3088 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3089 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3090 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3091 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3092 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3093 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3094 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3095 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3096 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3097 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3098 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3099 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3100 0;
3101 }
3102
3103 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3104 {
3105 const struct vxlan_dev *vxlan = netdev_priv(dev);
3106 const struct vxlan_rdst *dst = &vxlan->default_dst;
3107 struct ifla_vxlan_port_range ports = {
3108 .low = htons(vxlan->cfg.port_min),
3109 .high = htons(vxlan->cfg.port_max),
3110 };
3111
3112 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3113 goto nla_put_failure;
3114
3115 if (!vxlan_addr_any(&dst->remote_ip)) {
3116 if (dst->remote_ip.sa.sa_family == AF_INET) {
3117 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3118 dst->remote_ip.sin.sin_addr.s_addr))
3119 goto nla_put_failure;
3120 #if IS_ENABLED(CONFIG_IPV6)
3121 } else {
3122 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3123 &dst->remote_ip.sin6.sin6_addr))
3124 goto nla_put_failure;
3125 #endif
3126 }
3127 }
3128
3129 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3130 goto nla_put_failure;
3131
3132 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3133 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3134 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3135 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3136 goto nla_put_failure;
3137 #if IS_ENABLED(CONFIG_IPV6)
3138 } else {
3139 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3140 &vxlan->cfg.saddr.sin6.sin6_addr))
3141 goto nla_put_failure;
3142 #endif
3143 }
3144 }
3145
3146 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3147 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3148 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3149 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3150 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3151 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3152 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3153 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3154 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3155 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3156 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3157 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3158 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3159 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3160 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3161 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3162 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3163 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3164 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3165 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3166 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3167 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3168 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3169 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3170 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3171 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3172 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3173 goto nla_put_failure;
3174
3175 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3176 goto nla_put_failure;
3177
3178 if (vxlan->flags & VXLAN_F_GBP &&
3179 nla_put_flag(skb, IFLA_VXLAN_GBP))
3180 goto nla_put_failure;
3181
3182 if (vxlan->flags & VXLAN_F_GPE &&
3183 nla_put_flag(skb, IFLA_VXLAN_GPE))
3184 goto nla_put_failure;
3185
3186 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3187 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3188 goto nla_put_failure;
3189
3190 return 0;
3191
3192 nla_put_failure:
3193 return -EMSGSIZE;
3194 }
3195
3196 static struct net *vxlan_get_link_net(const struct net_device *dev)
3197 {
3198 struct vxlan_dev *vxlan = netdev_priv(dev);
3199
3200 return vxlan->net;
3201 }
3202
3203 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3204 .kind = "vxlan",
3205 .maxtype = IFLA_VXLAN_MAX,
3206 .policy = vxlan_policy,
3207 .priv_size = sizeof(struct vxlan_dev),
3208 .setup = vxlan_setup,
3209 .validate = vxlan_validate,
3210 .newlink = vxlan_newlink,
3211 .dellink = vxlan_dellink,
3212 .get_size = vxlan_get_size,
3213 .fill_info = vxlan_fill_info,
3214 .get_link_net = vxlan_get_link_net,
3215 };
3216
3217 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3218 u8 name_assign_type,
3219 struct vxlan_config *conf)
3220 {
3221 struct nlattr *tb[IFLA_MAX + 1];
3222 struct net_device *dev;
3223 int err;
3224
3225 memset(&tb, 0, sizeof(tb));
3226
3227 dev = rtnl_create_link(net, name, name_assign_type,
3228 &vxlan_link_ops, tb);
3229 if (IS_ERR(dev))
3230 return dev;
3231
3232 err = vxlan_dev_configure(net, dev, conf);
3233 if (err < 0) {
3234 free_netdev(dev);
3235 return ERR_PTR(err);
3236 }
3237
3238 err = rtnl_configure_link(dev, NULL);
3239 if (err < 0) {
3240 LIST_HEAD(list_kill);
3241
3242 vxlan_dellink(dev, &list_kill);
3243 unregister_netdevice_many(&list_kill);
3244 return ERR_PTR(err);
3245 }
3246
3247 return dev;
3248 }
3249 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3250
3251 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3252 struct net_device *dev)
3253 {
3254 struct vxlan_dev *vxlan, *next;
3255 LIST_HEAD(list_kill);
3256
3257 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3258 struct vxlan_rdst *dst = &vxlan->default_dst;
3259
3260 /* In case we created vxlan device with carrier
3261 * and we loose the carrier due to module unload
3262 * we also need to remove vxlan device. In other
3263 * cases, it's not necessary and remote_ifindex
3264 * is 0 here, so no matches.
3265 */
3266 if (dst->remote_ifindex == dev->ifindex)
3267 vxlan_dellink(vxlan->dev, &list_kill);
3268 }
3269
3270 unregister_netdevice_many(&list_kill);
3271 }
3272
3273 static int vxlan_netdevice_event(struct notifier_block *unused,
3274 unsigned long event, void *ptr)
3275 {
3276 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3277 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3278
3279 if (event == NETDEV_UNREGISTER)
3280 vxlan_handle_lowerdev_unregister(vn, dev);
3281 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3282 vxlan_push_rx_ports(dev);
3283
3284 return NOTIFY_DONE;
3285 }
3286
3287 static struct notifier_block vxlan_notifier_block __read_mostly = {
3288 .notifier_call = vxlan_netdevice_event,
3289 };
3290
3291 static __net_init int vxlan_init_net(struct net *net)
3292 {
3293 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3294 unsigned int h;
3295
3296 INIT_LIST_HEAD(&vn->vxlan_list);
3297 spin_lock_init(&vn->sock_lock);
3298
3299 for (h = 0; h < PORT_HASH_SIZE; ++h)
3300 INIT_HLIST_HEAD(&vn->sock_list[h]);
3301
3302 return 0;
3303 }
3304
3305 static void __net_exit vxlan_exit_net(struct net *net)
3306 {
3307 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3308 struct vxlan_dev *vxlan, *next;
3309 struct net_device *dev, *aux;
3310 LIST_HEAD(list);
3311
3312 rtnl_lock();
3313 for_each_netdev_safe(net, dev, aux)
3314 if (dev->rtnl_link_ops == &vxlan_link_ops)
3315 unregister_netdevice_queue(dev, &list);
3316
3317 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3318 /* If vxlan->dev is in the same netns, it has already been added
3319 * to the list by the previous loop.
3320 */
3321 if (!net_eq(dev_net(vxlan->dev), net)) {
3322 gro_cells_destroy(&vxlan->gro_cells);
3323 unregister_netdevice_queue(vxlan->dev, &list);
3324 }
3325 }
3326
3327 unregister_netdevice_many(&list);
3328 rtnl_unlock();
3329 }
3330
3331 static struct pernet_operations vxlan_net_ops = {
3332 .init = vxlan_init_net,
3333 .exit = vxlan_exit_net,
3334 .id = &vxlan_net_id,
3335 .size = sizeof(struct vxlan_net),
3336 };
3337
3338 static int __init vxlan_init_module(void)
3339 {
3340 int rc;
3341
3342 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3343
3344 rc = register_pernet_subsys(&vxlan_net_ops);
3345 if (rc)
3346 goto out1;
3347
3348 rc = register_netdevice_notifier(&vxlan_notifier_block);
3349 if (rc)
3350 goto out2;
3351
3352 rc = rtnl_link_register(&vxlan_link_ops);
3353 if (rc)
3354 goto out3;
3355
3356 return 0;
3357 out3:
3358 unregister_netdevice_notifier(&vxlan_notifier_block);
3359 out2:
3360 unregister_pernet_subsys(&vxlan_net_ops);
3361 out1:
3362 return rc;
3363 }
3364 late_initcall(vxlan_init_module);
3365
3366 static void __exit vxlan_cleanup_module(void)
3367 {
3368 rtnl_link_unregister(&vxlan_link_ops);
3369 unregister_netdevice_notifier(&vxlan_notifier_block);
3370 unregister_pernet_subsys(&vxlan_net_ops);
3371 /* rcu_barrier() is called by netns */
3372 }
3373 module_exit(vxlan_cleanup_module);
3374
3375 MODULE_LICENSE("GPL");
3376 MODULE_VERSION(VXLAN_VERSION);
3377 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3378 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3379 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support