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[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * TODO
11 * - IPv6 (not in RFC)
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/slab.h>
21 #include <linux/skbuff.h>
22 #include <linux/rculist.h>
23 #include <linux/netdevice.h>
24 #include <linux/in.h>
25 #include <linux/ip.h>
26 #include <linux/udp.h>
27 #include <linux/igmp.h>
28 #include <linux/etherdevice.h>
29 #include <linux/if_ether.h>
30 #include <linux/hash.h>
31 #include <linux/ethtool.h>
32 #include <net/arp.h>
33 #include <net/ndisc.h>
34 #include <net/ip.h>
35 #include <net/ip_tunnels.h>
36 #include <net/icmp.h>
37 #include <net/udp.h>
38 #include <net/rtnetlink.h>
39 #include <net/route.h>
40 #include <net/dsfield.h>
41 #include <net/inet_ecn.h>
42 #include <net/net_namespace.h>
43 #include <net/netns/generic.h>
44
45 #define VXLAN_VERSION "0.1"
46
47 #define PORT_HASH_BITS 8
48 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
49 #define VNI_HASH_BITS 10
50 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
51 #define FDB_HASH_BITS 8
52 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
53 #define FDB_AGE_DEFAULT 300 /* 5 min */
54 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
55
56 #define VXLAN_N_VID (1u << 24)
57 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
58 /* IP header + UDP + VXLAN + Ethernet header */
59 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
60
61 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
62
63 /* VXLAN protocol header */
64 struct vxlanhdr {
65 __be32 vx_flags;
66 __be32 vx_vni;
67 };
68
69 /* UDP port for VXLAN traffic.
70 * The IANA assigned port is 4789, but the Linux default is 8472
71 * for compatability with early adopters.
72 */
73 static unsigned short vxlan_port __read_mostly = 8472;
74 module_param_named(udp_port, vxlan_port, ushort, 0444);
75 MODULE_PARM_DESC(udp_port, "Destination UDP port");
76
77 static bool log_ecn_error = true;
78 module_param(log_ecn_error, bool, 0644);
79 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
80
81 static unsigned int vxlan_net_id;
82
83 /* per UDP socket information */
84 struct vxlan_sock {
85 struct hlist_node hlist;
86 struct rcu_head rcu;
87 struct work_struct del_work;
88 atomic_t refcnt;
89 struct socket *sock;
90 struct hlist_head vni_list[VNI_HASH_SIZE];
91 };
92
93 /* per-network namespace private data for this module */
94 struct vxlan_net {
95 struct list_head vxlan_list;
96 struct hlist_head sock_list[PORT_HASH_SIZE];
97 spinlock_t sock_lock;
98 };
99
100 struct vxlan_rdst {
101 __be32 remote_ip;
102 __be16 remote_port;
103 u32 remote_vni;
104 u32 remote_ifindex;
105 struct list_head list;
106 };
107
108 /* Forwarding table entry */
109 struct vxlan_fdb {
110 struct hlist_node hlist; /* linked list of entries */
111 struct rcu_head rcu;
112 unsigned long updated; /* jiffies */
113 unsigned long used;
114 struct list_head remotes;
115 u16 state; /* see ndm_state */
116 u8 flags; /* see ndm_flags */
117 u8 eth_addr[ETH_ALEN];
118 };
119
120 /* Pseudo network device */
121 struct vxlan_dev {
122 struct hlist_node hlist; /* vni hash table */
123 struct list_head next; /* vxlan's per namespace list */
124 struct vxlan_sock *vn_sock; /* listening socket */
125 struct net_device *dev;
126 struct vxlan_rdst default_dst; /* default destination */
127 __be32 saddr; /* source address */
128 __be16 dst_port;
129 __u16 port_min; /* source port range */
130 __u16 port_max;
131 __u8 tos; /* TOS override */
132 __u8 ttl;
133 u32 flags; /* VXLAN_F_* below */
134
135 struct work_struct sock_work;
136 struct work_struct igmp_work;
137
138 unsigned long age_interval;
139 struct timer_list age_timer;
140 spinlock_t hash_lock;
141 unsigned int addrcnt;
142 unsigned int addrmax;
143
144 struct hlist_head fdb_head[FDB_HASH_SIZE];
145 };
146
147 #define VXLAN_F_LEARN 0x01
148 #define VXLAN_F_PROXY 0x02
149 #define VXLAN_F_RSC 0x04
150 #define VXLAN_F_L2MISS 0x08
151 #define VXLAN_F_L3MISS 0x10
152
153 /* salt for hash table */
154 static u32 vxlan_salt __read_mostly;
155 static struct workqueue_struct *vxlan_wq;
156
157 static void vxlan_sock_work(struct work_struct *work);
158
159 /* Virtual Network hash table head */
160 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
161 {
162 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
163 }
164
165 /* Socket hash table head */
166 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
167 {
168 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
169
170 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
171 }
172
173 /* First remote destination for a forwarding entry.
174 * Guaranteed to be non-NULL because remotes are never deleted.
175 */
176 static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb)
177 {
178 return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list);
179 }
180
181 /* Find VXLAN socket based on network namespace and UDP port */
182 static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
183 {
184 struct vxlan_sock *vs;
185
186 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
187 if (inet_sk(vs->sock->sk)->inet_sport == port)
188 return vs;
189 }
190 return NULL;
191 }
192
193 /* Look up VNI in a per net namespace table */
194 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
195 {
196 struct vxlan_sock *vs;
197 struct vxlan_dev *vxlan;
198
199 vs = vxlan_find_port(net, port);
200 if (!vs)
201 return NULL;
202
203 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
204 if (vxlan->default_dst.remote_vni == id)
205 return vxlan;
206 }
207
208 return NULL;
209 }
210
211 /* Fill in neighbour message in skbuff. */
212 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
213 const struct vxlan_fdb *fdb,
214 u32 portid, u32 seq, int type, unsigned int flags,
215 const struct vxlan_rdst *rdst)
216 {
217 unsigned long now = jiffies;
218 struct nda_cacheinfo ci;
219 struct nlmsghdr *nlh;
220 struct ndmsg *ndm;
221 bool send_ip, send_eth;
222
223 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
224 if (nlh == NULL)
225 return -EMSGSIZE;
226
227 ndm = nlmsg_data(nlh);
228 memset(ndm, 0, sizeof(*ndm));
229
230 send_eth = send_ip = true;
231
232 if (type == RTM_GETNEIGH) {
233 ndm->ndm_family = AF_INET;
234 send_ip = rdst->remote_ip != htonl(INADDR_ANY);
235 send_eth = !is_zero_ether_addr(fdb->eth_addr);
236 } else
237 ndm->ndm_family = AF_BRIDGE;
238 ndm->ndm_state = fdb->state;
239 ndm->ndm_ifindex = vxlan->dev->ifindex;
240 ndm->ndm_flags = fdb->flags;
241 ndm->ndm_type = NDA_DST;
242
243 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
244 goto nla_put_failure;
245
246 if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip))
247 goto nla_put_failure;
248
249 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
250 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
251 goto nla_put_failure;
252 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
253 nla_put_be32(skb, NDA_VNI, rdst->remote_vni))
254 goto nla_put_failure;
255 if (rdst->remote_ifindex &&
256 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
257 goto nla_put_failure;
258
259 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
260 ci.ndm_confirmed = 0;
261 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
262 ci.ndm_refcnt = 0;
263
264 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
265 goto nla_put_failure;
266
267 return nlmsg_end(skb, nlh);
268
269 nla_put_failure:
270 nlmsg_cancel(skb, nlh);
271 return -EMSGSIZE;
272 }
273
274 static inline size_t vxlan_nlmsg_size(void)
275 {
276 return NLMSG_ALIGN(sizeof(struct ndmsg))
277 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
278 + nla_total_size(sizeof(__be32)) /* NDA_DST */
279 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
280 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
281 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
282 + nla_total_size(sizeof(struct nda_cacheinfo));
283 }
284
285 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
286 struct vxlan_fdb *fdb, int type)
287 {
288 struct net *net = dev_net(vxlan->dev);
289 struct sk_buff *skb;
290 int err = -ENOBUFS;
291
292 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
293 if (skb == NULL)
294 goto errout;
295
296 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb));
297 if (err < 0) {
298 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
299 WARN_ON(err == -EMSGSIZE);
300 kfree_skb(skb);
301 goto errout;
302 }
303
304 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
305 return;
306 errout:
307 if (err < 0)
308 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
309 }
310
311 static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
312 {
313 struct vxlan_dev *vxlan = netdev_priv(dev);
314 struct vxlan_fdb f;
315 struct vxlan_rdst remote;
316
317 memset(&f, 0, sizeof f);
318 f.state = NUD_STALE;
319
320 remote.remote_ip = ipa; /* goes to NDA_DST */
321 remote.remote_vni = VXLAN_N_VID;
322
323 INIT_LIST_HEAD(&f.remotes);
324 list_add_rcu(&remote.list, &f.remotes);
325
326 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
327 }
328
329 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
330 {
331 struct vxlan_fdb f;
332
333 memset(&f, 0, sizeof f);
334 INIT_LIST_HEAD(&f.remotes);
335 f.state = NUD_STALE;
336 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
337
338 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
339 }
340
341 /* Hash Ethernet address */
342 static u32 eth_hash(const unsigned char *addr)
343 {
344 u64 value = get_unaligned((u64 *)addr);
345
346 /* only want 6 bytes */
347 #ifdef __BIG_ENDIAN
348 value >>= 16;
349 #else
350 value <<= 16;
351 #endif
352 return hash_64(value, FDB_HASH_BITS);
353 }
354
355 /* Hash chain to use given mac address */
356 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
357 const u8 *mac)
358 {
359 return &vxlan->fdb_head[eth_hash(mac)];
360 }
361
362 /* Look up Ethernet address in forwarding table */
363 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
364 const u8 *mac)
365
366 {
367 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
368 struct vxlan_fdb *f;
369
370 hlist_for_each_entry_rcu(f, head, hlist) {
371 if (compare_ether_addr(mac, f->eth_addr) == 0)
372 return f;
373 }
374
375 return NULL;
376 }
377
378 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
379 const u8 *mac)
380 {
381 struct vxlan_fdb *f;
382
383 f = __vxlan_find_mac(vxlan, mac);
384 if (f)
385 f->used = jiffies;
386
387 return f;
388 }
389
390 /* Add/update destinations for multicast */
391 static int vxlan_fdb_append(struct vxlan_fdb *f,
392 __be32 ip, __be16 port, __u32 vni, __u32 ifindex)
393 {
394 struct vxlan_rdst *rd;
395
396 /* protected by vxlan->hash_lock */
397 list_for_each_entry(rd, &f->remotes, list) {
398 if (rd->remote_ip == ip &&
399 rd->remote_port == port &&
400 rd->remote_vni == vni &&
401 rd->remote_ifindex == ifindex)
402 return 0;
403 }
404
405 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
406 if (rd == NULL)
407 return -ENOBUFS;
408 rd->remote_ip = ip;
409 rd->remote_port = port;
410 rd->remote_vni = vni;
411 rd->remote_ifindex = ifindex;
412
413 list_add_tail_rcu(&rd->list, &f->remotes);
414
415 return 1;
416 }
417
418 /* Add new entry to forwarding table -- assumes lock held */
419 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
420 const u8 *mac, __be32 ip,
421 __u16 state, __u16 flags,
422 __be16 port, __u32 vni, __u32 ifindex,
423 __u8 ndm_flags)
424 {
425 struct vxlan_fdb *f;
426 int notify = 0;
427
428 f = __vxlan_find_mac(vxlan, mac);
429 if (f) {
430 if (flags & NLM_F_EXCL) {
431 netdev_dbg(vxlan->dev,
432 "lost race to create %pM\n", mac);
433 return -EEXIST;
434 }
435 if (f->state != state) {
436 f->state = state;
437 f->updated = jiffies;
438 notify = 1;
439 }
440 if (f->flags != ndm_flags) {
441 f->flags = ndm_flags;
442 f->updated = jiffies;
443 notify = 1;
444 }
445 if ((flags & NLM_F_APPEND) &&
446 is_multicast_ether_addr(f->eth_addr)) {
447 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
448
449 if (rc < 0)
450 return rc;
451 notify |= rc;
452 }
453 } else {
454 if (!(flags & NLM_F_CREATE))
455 return -ENOENT;
456
457 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
458 return -ENOSPC;
459
460 netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
461 f = kmalloc(sizeof(*f), GFP_ATOMIC);
462 if (!f)
463 return -ENOMEM;
464
465 notify = 1;
466 f->state = state;
467 f->flags = ndm_flags;
468 f->updated = f->used = jiffies;
469 INIT_LIST_HEAD(&f->remotes);
470 memcpy(f->eth_addr, mac, ETH_ALEN);
471
472 vxlan_fdb_append(f, ip, port, vni, ifindex);
473
474 ++vxlan->addrcnt;
475 hlist_add_head_rcu(&f->hlist,
476 vxlan_fdb_head(vxlan, mac));
477 }
478
479 if (notify)
480 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
481
482 return 0;
483 }
484
485 static void vxlan_fdb_free(struct rcu_head *head)
486 {
487 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
488 struct vxlan_rdst *rd, *nd;
489
490 list_for_each_entry_safe(rd, nd, &f->remotes, list)
491 kfree(rd);
492 kfree(f);
493 }
494
495 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
496 {
497 netdev_dbg(vxlan->dev,
498 "delete %pM\n", f->eth_addr);
499
500 --vxlan->addrcnt;
501 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
502
503 hlist_del_rcu(&f->hlist);
504 call_rcu(&f->rcu, vxlan_fdb_free);
505 }
506
507 /* Add static entry (via netlink) */
508 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
509 struct net_device *dev,
510 const unsigned char *addr, u16 flags)
511 {
512 struct vxlan_dev *vxlan = netdev_priv(dev);
513 struct net *net = dev_net(vxlan->dev);
514 __be32 ip;
515 __be16 port;
516 u32 vni, ifindex;
517 int err;
518
519 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
520 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
521 ndm->ndm_state);
522 return -EINVAL;
523 }
524
525 if (tb[NDA_DST] == NULL)
526 return -EINVAL;
527
528 if (nla_len(tb[NDA_DST]) != sizeof(__be32))
529 return -EAFNOSUPPORT;
530
531 ip = nla_get_be32(tb[NDA_DST]);
532
533 if (tb[NDA_PORT]) {
534 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
535 return -EINVAL;
536 port = nla_get_be16(tb[NDA_PORT]);
537 } else
538 port = vxlan->dst_port;
539
540 if (tb[NDA_VNI]) {
541 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
542 return -EINVAL;
543 vni = nla_get_u32(tb[NDA_VNI]);
544 } else
545 vni = vxlan->default_dst.remote_vni;
546
547 if (tb[NDA_IFINDEX]) {
548 struct net_device *tdev;
549
550 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
551 return -EINVAL;
552 ifindex = nla_get_u32(tb[NDA_IFINDEX]);
553 tdev = dev_get_by_index(net, ifindex);
554 if (!tdev)
555 return -EADDRNOTAVAIL;
556 dev_put(tdev);
557 } else
558 ifindex = 0;
559
560 spin_lock_bh(&vxlan->hash_lock);
561 err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags,
562 port, vni, ifindex, ndm->ndm_flags);
563 spin_unlock_bh(&vxlan->hash_lock);
564
565 return err;
566 }
567
568 /* Delete entry (via netlink) */
569 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
570 struct net_device *dev,
571 const unsigned char *addr)
572 {
573 struct vxlan_dev *vxlan = netdev_priv(dev);
574 struct vxlan_fdb *f;
575 int err = -ENOENT;
576
577 spin_lock_bh(&vxlan->hash_lock);
578 f = vxlan_find_mac(vxlan, addr);
579 if (f) {
580 vxlan_fdb_destroy(vxlan, f);
581 err = 0;
582 }
583 spin_unlock_bh(&vxlan->hash_lock);
584
585 return err;
586 }
587
588 /* Dump forwarding table */
589 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
590 struct net_device *dev, int idx)
591 {
592 struct vxlan_dev *vxlan = netdev_priv(dev);
593 unsigned int h;
594
595 for (h = 0; h < FDB_HASH_SIZE; ++h) {
596 struct vxlan_fdb *f;
597 int err;
598
599 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
600 struct vxlan_rdst *rd;
601
602 if (idx < cb->args[0])
603 goto skip;
604
605 list_for_each_entry_rcu(rd, &f->remotes, list) {
606 err = vxlan_fdb_info(skb, vxlan, f,
607 NETLINK_CB(cb->skb).portid,
608 cb->nlh->nlmsg_seq,
609 RTM_NEWNEIGH,
610 NLM_F_MULTI, rd);
611 if (err < 0)
612 goto out;
613 }
614 skip:
615 ++idx;
616 }
617 }
618 out:
619 return idx;
620 }
621
622 /* Watch incoming packets to learn mapping between Ethernet address
623 * and Tunnel endpoint.
624 * Return true if packet is bogus and should be droppped.
625 */
626 static bool vxlan_snoop(struct net_device *dev,
627 __be32 src_ip, const u8 *src_mac)
628 {
629 struct vxlan_dev *vxlan = netdev_priv(dev);
630 struct vxlan_fdb *f;
631
632 f = vxlan_find_mac(vxlan, src_mac);
633 if (likely(f)) {
634 struct vxlan_rdst *rdst = first_remote(f);
635
636 if (likely(rdst->remote_ip == src_ip))
637 return false;
638
639 /* Don't migrate static entries, drop packets */
640 if (f->state & NUD_NOARP)
641 return true;
642
643 if (net_ratelimit())
644 netdev_info(dev,
645 "%pM migrated from %pI4 to %pI4\n",
646 src_mac, &rdst->remote_ip, &src_ip);
647
648 rdst->remote_ip = src_ip;
649 f->updated = jiffies;
650 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
651 } else {
652 /* learned new entry */
653 spin_lock(&vxlan->hash_lock);
654
655 /* close off race between vxlan_flush and incoming packets */
656 if (netif_running(dev))
657 vxlan_fdb_create(vxlan, src_mac, src_ip,
658 NUD_REACHABLE,
659 NLM_F_EXCL|NLM_F_CREATE,
660 vxlan->dst_port,
661 vxlan->default_dst.remote_vni,
662 0, NTF_SELF);
663 spin_unlock(&vxlan->hash_lock);
664 }
665
666 return false;
667 }
668
669
670 /* See if multicast group is already in use by other ID */
671 static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip)
672 {
673 struct vxlan_dev *vxlan;
674
675 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
676 if (!netif_running(vxlan->dev))
677 continue;
678
679 if (vxlan->default_dst.remote_ip == remote_ip)
680 return true;
681 }
682
683 return false;
684 }
685
686 static void vxlan_sock_hold(struct vxlan_sock *vs)
687 {
688 atomic_inc(&vs->refcnt);
689 }
690
691 static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs)
692 {
693 if (!atomic_dec_and_test(&vs->refcnt))
694 return;
695
696 spin_lock(&vn->sock_lock);
697 hlist_del_rcu(&vs->hlist);
698 spin_unlock(&vn->sock_lock);
699
700 queue_work(vxlan_wq, &vs->del_work);
701 }
702
703 /* Callback to update multicast group membership.
704 * Scheduled when vxlan goes up/down.
705 */
706 static void vxlan_igmp_work(struct work_struct *work)
707 {
708 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work);
709 struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id);
710 struct vxlan_sock *vs = vxlan->vn_sock;
711 struct sock *sk = vs->sock->sk;
712 struct ip_mreqn mreq = {
713 .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip,
714 .imr_ifindex = vxlan->default_dst.remote_ifindex,
715 };
716
717 lock_sock(sk);
718 if (vxlan_group_used(vn, vxlan->default_dst.remote_ip))
719 ip_mc_join_group(sk, &mreq);
720 else
721 ip_mc_leave_group(sk, &mreq);
722 release_sock(sk);
723
724 vxlan_sock_release(vn, vs);
725 dev_put(vxlan->dev);
726 }
727
728 /* Callback from net/ipv4/udp.c to receive packets */
729 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
730 {
731 struct iphdr *oip;
732 struct vxlanhdr *vxh;
733 struct vxlan_dev *vxlan;
734 struct pcpu_tstats *stats;
735 __be16 port;
736 __u32 vni;
737 int err;
738
739 /* pop off outer UDP header */
740 __skb_pull(skb, sizeof(struct udphdr));
741
742 /* Need Vxlan and inner Ethernet header to be present */
743 if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
744 goto error;
745
746 /* Drop packets with reserved bits set */
747 vxh = (struct vxlanhdr *) skb->data;
748 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
749 (vxh->vx_vni & htonl(0xff))) {
750 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
751 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
752 goto error;
753 }
754
755 __skb_pull(skb, sizeof(struct vxlanhdr));
756
757 /* Is this VNI defined? */
758 vni = ntohl(vxh->vx_vni) >> 8;
759 port = inet_sk(sk)->inet_sport;
760 vxlan = vxlan_find_vni(sock_net(sk), vni, port);
761 if (!vxlan) {
762 netdev_dbg(skb->dev, "unknown vni %d port %u\n",
763 vni, ntohs(port));
764 goto drop;
765 }
766
767 if (!pskb_may_pull(skb, ETH_HLEN)) {
768 vxlan->dev->stats.rx_length_errors++;
769 vxlan->dev->stats.rx_errors++;
770 goto drop;
771 }
772
773 skb_reset_mac_header(skb);
774
775 /* Re-examine inner Ethernet packet */
776 oip = ip_hdr(skb);
777 skb->protocol = eth_type_trans(skb, vxlan->dev);
778
779 /* Ignore packet loops (and multicast echo) */
780 if (compare_ether_addr(eth_hdr(skb)->h_source,
781 vxlan->dev->dev_addr) == 0)
782 goto drop;
783
784 if ((vxlan->flags & VXLAN_F_LEARN) &&
785 vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source))
786 goto drop;
787
788 __skb_tunnel_rx(skb, vxlan->dev);
789 skb_reset_network_header(skb);
790
791 /* If the NIC driver gave us an encapsulated packet with
792 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
793 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
794 * for us. Otherwise force the upper layers to verify it.
795 */
796 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
797 !(vxlan->dev->features & NETIF_F_RXCSUM))
798 skb->ip_summed = CHECKSUM_NONE;
799
800 skb->encapsulation = 0;
801
802 err = IP_ECN_decapsulate(oip, skb);
803 if (unlikely(err)) {
804 if (log_ecn_error)
805 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
806 &oip->saddr, oip->tos);
807 if (err > 1) {
808 ++vxlan->dev->stats.rx_frame_errors;
809 ++vxlan->dev->stats.rx_errors;
810 goto drop;
811 }
812 }
813
814 stats = this_cpu_ptr(vxlan->dev->tstats);
815 u64_stats_update_begin(&stats->syncp);
816 stats->rx_packets++;
817 stats->rx_bytes += skb->len;
818 u64_stats_update_end(&stats->syncp);
819
820 netif_rx(skb);
821
822 return 0;
823 error:
824 /* Put UDP header back */
825 __skb_push(skb, sizeof(struct udphdr));
826
827 return 1;
828 drop:
829 /* Consume bad packet */
830 kfree_skb(skb);
831 return 0;
832 }
833
834 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
835 {
836 struct vxlan_dev *vxlan = netdev_priv(dev);
837 struct arphdr *parp;
838 u8 *arpptr, *sha;
839 __be32 sip, tip;
840 struct neighbour *n;
841
842 if (dev->flags & IFF_NOARP)
843 goto out;
844
845 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
846 dev->stats.tx_dropped++;
847 goto out;
848 }
849 parp = arp_hdr(skb);
850
851 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
852 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
853 parp->ar_pro != htons(ETH_P_IP) ||
854 parp->ar_op != htons(ARPOP_REQUEST) ||
855 parp->ar_hln != dev->addr_len ||
856 parp->ar_pln != 4)
857 goto out;
858 arpptr = (u8 *)parp + sizeof(struct arphdr);
859 sha = arpptr;
860 arpptr += dev->addr_len; /* sha */
861 memcpy(&sip, arpptr, sizeof(sip));
862 arpptr += sizeof(sip);
863 arpptr += dev->addr_len; /* tha */
864 memcpy(&tip, arpptr, sizeof(tip));
865
866 if (ipv4_is_loopback(tip) ||
867 ipv4_is_multicast(tip))
868 goto out;
869
870 n = neigh_lookup(&arp_tbl, &tip, dev);
871
872 if (n) {
873 struct vxlan_fdb *f;
874 struct sk_buff *reply;
875
876 if (!(n->nud_state & NUD_CONNECTED)) {
877 neigh_release(n);
878 goto out;
879 }
880
881 f = vxlan_find_mac(vxlan, n->ha);
882 if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) {
883 /* bridge-local neighbor */
884 neigh_release(n);
885 goto out;
886 }
887
888 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
889 n->ha, sha);
890
891 neigh_release(n);
892
893 skb_reset_mac_header(reply);
894 __skb_pull(reply, skb_network_offset(reply));
895 reply->ip_summed = CHECKSUM_UNNECESSARY;
896 reply->pkt_type = PACKET_HOST;
897
898 if (netif_rx_ni(reply) == NET_RX_DROP)
899 dev->stats.rx_dropped++;
900 } else if (vxlan->flags & VXLAN_F_L3MISS)
901 vxlan_ip_miss(dev, tip);
902 out:
903 consume_skb(skb);
904 return NETDEV_TX_OK;
905 }
906
907 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
908 {
909 struct vxlan_dev *vxlan = netdev_priv(dev);
910 struct neighbour *n;
911 struct iphdr *pip;
912
913 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
914 return false;
915
916 n = NULL;
917 switch (ntohs(eth_hdr(skb)->h_proto)) {
918 case ETH_P_IP:
919 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
920 return false;
921 pip = ip_hdr(skb);
922 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
923 break;
924 default:
925 return false;
926 }
927
928 if (n) {
929 bool diff;
930
931 diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0;
932 if (diff) {
933 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
934 dev->addr_len);
935 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
936 }
937 neigh_release(n);
938 return diff;
939 } else if (vxlan->flags & VXLAN_F_L3MISS)
940 vxlan_ip_miss(dev, pip->daddr);
941 return false;
942 }
943
944 static void vxlan_sock_put(struct sk_buff *skb)
945 {
946 sock_put(skb->sk);
947 }
948
949 /* On transmit, associate with the tunnel socket */
950 static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
951 {
952 struct vxlan_dev *vxlan = netdev_priv(dev);
953 struct sock *sk = vxlan->vn_sock->sock->sk;
954
955 skb_orphan(skb);
956 sock_hold(sk);
957 skb->sk = sk;
958 skb->destructor = vxlan_sock_put;
959 }
960
961 /* Compute source port for outgoing packet
962 * first choice to use L4 flow hash since it will spread
963 * better and maybe available from hardware
964 * secondary choice is to use jhash on the Ethernet header
965 */
966 static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
967 {
968 unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
969 u32 hash;
970
971 hash = skb_get_rxhash(skb);
972 if (!hash)
973 hash = jhash(skb->data, 2 * ETH_ALEN,
974 (__force u32) skb->protocol);
975
976 return htons((((u64) hash * range) >> 32) + vxlan->port_min);
977 }
978
979 static int handle_offloads(struct sk_buff *skb)
980 {
981 if (skb_is_gso(skb)) {
982 int err = skb_unclone(skb, GFP_ATOMIC);
983 if (unlikely(err))
984 return err;
985
986 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
987 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
988 skb->ip_summed = CHECKSUM_NONE;
989
990 return 0;
991 }
992
993 /* Bypass encapsulation if the destination is local */
994 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
995 struct vxlan_dev *dst_vxlan)
996 {
997 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
998 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
999
1000 skb->pkt_type = PACKET_HOST;
1001 skb->encapsulation = 0;
1002 skb->dev = dst_vxlan->dev;
1003 __skb_pull(skb, skb_network_offset(skb));
1004
1005 if (dst_vxlan->flags & VXLAN_F_LEARN)
1006 vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
1007 eth_hdr(skb)->h_source);
1008
1009 u64_stats_update_begin(&tx_stats->syncp);
1010 tx_stats->tx_packets++;
1011 tx_stats->tx_bytes += skb->len;
1012 u64_stats_update_end(&tx_stats->syncp);
1013
1014 if (netif_rx(skb) == NET_RX_SUCCESS) {
1015 u64_stats_update_begin(&rx_stats->syncp);
1016 rx_stats->rx_packets++;
1017 rx_stats->rx_bytes += skb->len;
1018 u64_stats_update_end(&rx_stats->syncp);
1019 } else {
1020 skb->dev->stats.rx_dropped++;
1021 }
1022 }
1023
1024 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1025 struct vxlan_rdst *rdst, bool did_rsc)
1026 {
1027 struct vxlan_dev *vxlan = netdev_priv(dev);
1028 struct rtable *rt;
1029 const struct iphdr *old_iph;
1030 struct vxlanhdr *vxh;
1031 struct udphdr *uh;
1032 struct flowi4 fl4;
1033 __be32 dst;
1034 __be16 src_port, dst_port;
1035 u32 vni;
1036 __be16 df = 0;
1037 __u8 tos, ttl;
1038 int err;
1039
1040 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1041 vni = rdst->remote_vni;
1042 dst = rdst->remote_ip;
1043
1044 if (!dst) {
1045 if (did_rsc) {
1046 /* short-circuited back to local bridge */
1047 vxlan_encap_bypass(skb, vxlan, vxlan);
1048 return;
1049 }
1050 goto drop;
1051 }
1052
1053 if (!skb->encapsulation) {
1054 skb_reset_inner_headers(skb);
1055 skb->encapsulation = 1;
1056 }
1057
1058 /* Need space for new headers (invalidates iph ptr) */
1059 if (skb_cow_head(skb, VXLAN_HEADROOM))
1060 goto drop;
1061
1062 old_iph = ip_hdr(skb);
1063
1064 ttl = vxlan->ttl;
1065 if (!ttl && IN_MULTICAST(ntohl(dst)))
1066 ttl = 1;
1067
1068 tos = vxlan->tos;
1069 if (tos == 1)
1070 tos = ip_tunnel_get_dsfield(old_iph, skb);
1071
1072 src_port = vxlan_src_port(vxlan, skb);
1073
1074 memset(&fl4, 0, sizeof(fl4));
1075 fl4.flowi4_oif = rdst->remote_ifindex;
1076 fl4.flowi4_tos = RT_TOS(tos);
1077 fl4.daddr = dst;
1078 fl4.saddr = vxlan->saddr;
1079
1080 rt = ip_route_output_key(dev_net(dev), &fl4);
1081 if (IS_ERR(rt)) {
1082 netdev_dbg(dev, "no route to %pI4\n", &dst);
1083 dev->stats.tx_carrier_errors++;
1084 goto tx_error;
1085 }
1086
1087 if (rt->dst.dev == dev) {
1088 netdev_dbg(dev, "circular route to %pI4\n", &dst);
1089 ip_rt_put(rt);
1090 dev->stats.collisions++;
1091 goto tx_error;
1092 }
1093
1094 /* Bypass encapsulation if the destination is local */
1095 if (rt->rt_flags & RTCF_LOCAL &&
1096 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1097 struct vxlan_dev *dst_vxlan;
1098
1099 ip_rt_put(rt);
1100 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1101 if (!dst_vxlan)
1102 goto tx_error;
1103 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1104 return;
1105 }
1106 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1107 vxh->vx_flags = htonl(VXLAN_FLAGS);
1108 vxh->vx_vni = htonl(vni << 8);
1109
1110 __skb_push(skb, sizeof(*uh));
1111 skb_reset_transport_header(skb);
1112 uh = udp_hdr(skb);
1113
1114 uh->dest = dst_port;
1115 uh->source = src_port;
1116
1117 uh->len = htons(skb->len);
1118 uh->check = 0;
1119
1120 vxlan_set_owner(dev, skb);
1121
1122 if (handle_offloads(skb))
1123 goto drop;
1124
1125 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1126 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1127
1128 err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst,
1129 IPPROTO_UDP, tos, ttl, df);
1130 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1131
1132 return;
1133
1134 drop:
1135 dev->stats.tx_dropped++;
1136 goto tx_free;
1137
1138 tx_error:
1139 dev->stats.tx_errors++;
1140 tx_free:
1141 dev_kfree_skb(skb);
1142 }
1143
1144 /* Transmit local packets over Vxlan
1145 *
1146 * Outer IP header inherits ECN and DF from inner header.
1147 * Outer UDP destination is the VXLAN assigned port.
1148 * source port is based on hash of flow
1149 */
1150 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1151 {
1152 struct vxlan_dev *vxlan = netdev_priv(dev);
1153 struct ethhdr *eth;
1154 bool did_rsc = false;
1155 struct vxlan_rdst *rdst0, *rdst;
1156 struct vxlan_fdb *f;
1157
1158 skb_reset_mac_header(skb);
1159 eth = eth_hdr(skb);
1160
1161 if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP)
1162 return arp_reduce(dev, skb);
1163
1164 f = vxlan_find_mac(vxlan, eth->h_dest);
1165 did_rsc = false;
1166
1167 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1168 ntohs(eth->h_proto) == ETH_P_IP) {
1169 did_rsc = route_shortcircuit(dev, skb);
1170 if (did_rsc)
1171 f = vxlan_find_mac(vxlan, eth->h_dest);
1172 }
1173
1174 if (f == NULL) {
1175 rdst0 = &vxlan->default_dst;
1176
1177 if (rdst0->remote_ip == htonl(INADDR_ANY) &&
1178 (vxlan->flags & VXLAN_F_L2MISS) &&
1179 !is_multicast_ether_addr(eth->h_dest))
1180 vxlan_fdb_miss(vxlan, eth->h_dest);
1181 } else {
1182 rdst = rdst0 = first_remote(f);
1183
1184 /* if there are multiple destinations, send copies */
1185 list_for_each_entry_continue_rcu(rdst, &f->remotes, list) {
1186 struct sk_buff *skb1;
1187
1188 skb1 = skb_clone(skb, GFP_ATOMIC);
1189 if (skb1)
1190 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1191 }
1192 }
1193
1194 vxlan_xmit_one(skb, dev, rdst0, did_rsc);
1195 return NETDEV_TX_OK;
1196 }
1197
1198 /* Walk the forwarding table and purge stale entries */
1199 static void vxlan_cleanup(unsigned long arg)
1200 {
1201 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1202 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1203 unsigned int h;
1204
1205 if (!netif_running(vxlan->dev))
1206 return;
1207
1208 spin_lock_bh(&vxlan->hash_lock);
1209 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1210 struct hlist_node *p, *n;
1211 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1212 struct vxlan_fdb *f
1213 = container_of(p, struct vxlan_fdb, hlist);
1214 unsigned long timeout;
1215
1216 if (f->state & NUD_PERMANENT)
1217 continue;
1218
1219 timeout = f->used + vxlan->age_interval * HZ;
1220 if (time_before_eq(timeout, jiffies)) {
1221 netdev_dbg(vxlan->dev,
1222 "garbage collect %pM\n",
1223 f->eth_addr);
1224 f->state = NUD_STALE;
1225 vxlan_fdb_destroy(vxlan, f);
1226 } else if (time_before(timeout, next_timer))
1227 next_timer = timeout;
1228 }
1229 }
1230 spin_unlock_bh(&vxlan->hash_lock);
1231
1232 mod_timer(&vxlan->age_timer, next_timer);
1233 }
1234
1235 /* Setup stats when device is created */
1236 static int vxlan_init(struct net_device *dev)
1237 {
1238 struct vxlan_dev *vxlan = netdev_priv(dev);
1239 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1240 struct vxlan_sock *vs;
1241 __u32 vni = vxlan->default_dst.remote_vni;
1242
1243 dev->tstats = alloc_percpu(struct pcpu_tstats);
1244 if (!dev->tstats)
1245 return -ENOMEM;
1246
1247 spin_lock(&vn->sock_lock);
1248 vs = vxlan_find_port(dev_net(dev), vxlan->dst_port);
1249 if (vs) {
1250 /* If we have a socket with same port already, reuse it */
1251 atomic_inc(&vs->refcnt);
1252 vxlan->vn_sock = vs;
1253 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1254 } else {
1255 /* otherwise make new socket outside of RTNL */
1256 dev_hold(dev);
1257 queue_work(vxlan_wq, &vxlan->sock_work);
1258 }
1259 spin_unlock(&vn->sock_lock);
1260
1261 return 0;
1262 }
1263
1264 static void vxlan_uninit(struct net_device *dev)
1265 {
1266 struct vxlan_dev *vxlan = netdev_priv(dev);
1267 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1268 struct vxlan_sock *vs = vxlan->vn_sock;
1269
1270 if (vs)
1271 vxlan_sock_release(vn, vs);
1272 free_percpu(dev->tstats);
1273 }
1274
1275 /* Start ageing timer and join group when device is brought up */
1276 static int vxlan_open(struct net_device *dev)
1277 {
1278 struct vxlan_dev *vxlan = netdev_priv(dev);
1279 struct vxlan_sock *vs = vxlan->vn_sock;
1280
1281 /* socket hasn't been created */
1282 if (!vs)
1283 return -ENOTCONN;
1284
1285 if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
1286 vxlan_sock_hold(vs);
1287 dev_hold(dev);
1288 queue_work(vxlan_wq, &vxlan->igmp_work);
1289 }
1290
1291 if (vxlan->age_interval)
1292 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1293
1294 return 0;
1295 }
1296
1297 /* Purge the forwarding table */
1298 static void vxlan_flush(struct vxlan_dev *vxlan)
1299 {
1300 unsigned int h;
1301
1302 spin_lock_bh(&vxlan->hash_lock);
1303 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1304 struct hlist_node *p, *n;
1305 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1306 struct vxlan_fdb *f
1307 = container_of(p, struct vxlan_fdb, hlist);
1308 vxlan_fdb_destroy(vxlan, f);
1309 }
1310 }
1311 spin_unlock_bh(&vxlan->hash_lock);
1312 }
1313
1314 /* Cleanup timer and forwarding table on shutdown */
1315 static int vxlan_stop(struct net_device *dev)
1316 {
1317 struct vxlan_dev *vxlan = netdev_priv(dev);
1318 struct vxlan_sock *vs = vxlan->vn_sock;
1319
1320 if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
1321 vxlan_sock_hold(vs);
1322 dev_hold(dev);
1323 queue_work(vxlan_wq, &vxlan->igmp_work);
1324 }
1325
1326 del_timer_sync(&vxlan->age_timer);
1327
1328 vxlan_flush(vxlan);
1329
1330 return 0;
1331 }
1332
1333 /* Stub, nothing needs to be done. */
1334 static void vxlan_set_multicast_list(struct net_device *dev)
1335 {
1336 }
1337
1338 static const struct net_device_ops vxlan_netdev_ops = {
1339 .ndo_init = vxlan_init,
1340 .ndo_uninit = vxlan_uninit,
1341 .ndo_open = vxlan_open,
1342 .ndo_stop = vxlan_stop,
1343 .ndo_start_xmit = vxlan_xmit,
1344 .ndo_get_stats64 = ip_tunnel_get_stats64,
1345 .ndo_set_rx_mode = vxlan_set_multicast_list,
1346 .ndo_change_mtu = eth_change_mtu,
1347 .ndo_validate_addr = eth_validate_addr,
1348 .ndo_set_mac_address = eth_mac_addr,
1349 .ndo_fdb_add = vxlan_fdb_add,
1350 .ndo_fdb_del = vxlan_fdb_delete,
1351 .ndo_fdb_dump = vxlan_fdb_dump,
1352 };
1353
1354 /* Info for udev, that this is a virtual tunnel endpoint */
1355 static struct device_type vxlan_type = {
1356 .name = "vxlan",
1357 };
1358
1359 /* Initialize the device structure. */
1360 static void vxlan_setup(struct net_device *dev)
1361 {
1362 struct vxlan_dev *vxlan = netdev_priv(dev);
1363 unsigned int h;
1364 int low, high;
1365
1366 eth_hw_addr_random(dev);
1367 ether_setup(dev);
1368 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
1369
1370 dev->netdev_ops = &vxlan_netdev_ops;
1371 dev->destructor = free_netdev;
1372 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
1373
1374 dev->tx_queue_len = 0;
1375 dev->features |= NETIF_F_LLTX;
1376 dev->features |= NETIF_F_NETNS_LOCAL;
1377 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1378 dev->features |= NETIF_F_RXCSUM;
1379 dev->features |= NETIF_F_GSO_SOFTWARE;
1380
1381 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1382 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1383 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1384 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1385
1386 INIT_LIST_HEAD(&vxlan->next);
1387 spin_lock_init(&vxlan->hash_lock);
1388 INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work);
1389 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
1390
1391 init_timer_deferrable(&vxlan->age_timer);
1392 vxlan->age_timer.function = vxlan_cleanup;
1393 vxlan->age_timer.data = (unsigned long) vxlan;
1394
1395 inet_get_local_port_range(&low, &high);
1396 vxlan->port_min = low;
1397 vxlan->port_max = high;
1398 vxlan->dst_port = htons(vxlan_port);
1399
1400 vxlan->dev = dev;
1401
1402 for (h = 0; h < FDB_HASH_SIZE; ++h)
1403 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1404 }
1405
1406 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1407 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
1408 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1409 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
1410 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1411 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
1412 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
1413 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
1414 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
1415 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
1416 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
1417 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
1418 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
1419 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
1420 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
1421 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
1422 };
1423
1424 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1425 {
1426 if (tb[IFLA_ADDRESS]) {
1427 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1428 pr_debug("invalid link address (not ethernet)\n");
1429 return -EINVAL;
1430 }
1431
1432 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1433 pr_debug("invalid all zero ethernet address\n");
1434 return -EADDRNOTAVAIL;
1435 }
1436 }
1437
1438 if (!data)
1439 return -EINVAL;
1440
1441 if (data[IFLA_VXLAN_ID]) {
1442 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1443 if (id >= VXLAN_VID_MASK)
1444 return -ERANGE;
1445 }
1446
1447 if (data[IFLA_VXLAN_PORT_RANGE]) {
1448 const struct ifla_vxlan_port_range *p
1449 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1450
1451 if (ntohs(p->high) < ntohs(p->low)) {
1452 pr_debug("port range %u .. %u not valid\n",
1453 ntohs(p->low), ntohs(p->high));
1454 return -EINVAL;
1455 }
1456 }
1457
1458 return 0;
1459 }
1460
1461 static void vxlan_get_drvinfo(struct net_device *netdev,
1462 struct ethtool_drvinfo *drvinfo)
1463 {
1464 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
1465 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
1466 }
1467
1468 static const struct ethtool_ops vxlan_ethtool_ops = {
1469 .get_drvinfo = vxlan_get_drvinfo,
1470 .get_link = ethtool_op_get_link,
1471 };
1472
1473 static void vxlan_del_work(struct work_struct *work)
1474 {
1475 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
1476
1477 sk_release_kernel(vs->sock->sk);
1478 kfree_rcu(vs, rcu);
1479 }
1480
1481 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
1482 {
1483 struct vxlan_sock *vs;
1484 struct sock *sk;
1485 struct sockaddr_in vxlan_addr = {
1486 .sin_family = AF_INET,
1487 .sin_addr.s_addr = htonl(INADDR_ANY),
1488 };
1489 int rc;
1490 unsigned int h;
1491
1492 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
1493 if (!vs)
1494 return ERR_PTR(-ENOMEM);
1495
1496 for (h = 0; h < VNI_HASH_SIZE; ++h)
1497 INIT_HLIST_HEAD(&vs->vni_list[h]);
1498
1499 INIT_WORK(&vs->del_work, vxlan_del_work);
1500
1501 /* Create UDP socket for encapsulation receive. */
1502 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
1503 if (rc < 0) {
1504 pr_debug("UDP socket create failed\n");
1505 kfree(vs);
1506 return ERR_PTR(rc);
1507 }
1508
1509 /* Put in proper namespace */
1510 sk = vs->sock->sk;
1511 sk_change_net(sk, net);
1512
1513 vxlan_addr.sin_port = port;
1514
1515 rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
1516 sizeof(vxlan_addr));
1517 if (rc < 0) {
1518 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1519 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
1520 sk_release_kernel(sk);
1521 kfree(vs);
1522 return ERR_PTR(rc);
1523 }
1524
1525 /* Disable multicast loopback */
1526 inet_sk(sk)->mc_loop = 0;
1527
1528 /* Mark socket as an encapsulation socket. */
1529 udp_sk(sk)->encap_type = 1;
1530 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1531 udp_encap_enable();
1532 atomic_set(&vs->refcnt, 1);
1533
1534 return vs;
1535 }
1536
1537 /* Scheduled at device creation to bind to a socket */
1538 static void vxlan_sock_work(struct work_struct *work)
1539 {
1540 struct vxlan_dev *vxlan
1541 = container_of(work, struct vxlan_dev, sock_work);
1542 struct net_device *dev = vxlan->dev;
1543 struct net *net = dev_net(dev);
1544 __u32 vni = vxlan->default_dst.remote_vni;
1545 __be16 port = vxlan->dst_port;
1546 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1547 struct vxlan_sock *nvs, *ovs;
1548
1549 nvs = vxlan_socket_create(net, port);
1550 if (IS_ERR(nvs)) {
1551 netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n",
1552 PTR_ERR(nvs));
1553 goto out;
1554 }
1555
1556 spin_lock(&vn->sock_lock);
1557 /* Look again to see if can reuse socket */
1558 ovs = vxlan_find_port(net, port);
1559 if (ovs) {
1560 atomic_inc(&ovs->refcnt);
1561 vxlan->vn_sock = ovs;
1562 hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni));
1563 spin_unlock(&vn->sock_lock);
1564
1565 sk_release_kernel(nvs->sock->sk);
1566 kfree(nvs);
1567 } else {
1568 vxlan->vn_sock = nvs;
1569 hlist_add_head_rcu(&nvs->hlist, vs_head(net, port));
1570 hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni));
1571 spin_unlock(&vn->sock_lock);
1572 }
1573 out:
1574 dev_put(dev);
1575 }
1576
1577 static int vxlan_newlink(struct net *net, struct net_device *dev,
1578 struct nlattr *tb[], struct nlattr *data[])
1579 {
1580 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1581 struct vxlan_dev *vxlan = netdev_priv(dev);
1582 struct vxlan_rdst *dst = &vxlan->default_dst;
1583 __u32 vni;
1584 int err;
1585
1586 if (!data[IFLA_VXLAN_ID])
1587 return -EINVAL;
1588
1589 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
1590 dst->remote_vni = vni;
1591
1592 if (data[IFLA_VXLAN_GROUP])
1593 dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1594
1595 if (data[IFLA_VXLAN_LOCAL])
1596 vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1597
1598 if (data[IFLA_VXLAN_LINK] &&
1599 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
1600 struct net_device *lowerdev
1601 = __dev_get_by_index(net, dst->remote_ifindex);
1602
1603 if (!lowerdev) {
1604 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
1605 return -ENODEV;
1606 }
1607
1608 if (!tb[IFLA_MTU])
1609 dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
1610
1611 /* update header length based on lower device */
1612 dev->hard_header_len = lowerdev->hard_header_len +
1613 VXLAN_HEADROOM;
1614 }
1615
1616 if (data[IFLA_VXLAN_TOS])
1617 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
1618
1619 if (data[IFLA_VXLAN_TTL])
1620 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
1621
1622 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
1623 vxlan->flags |= VXLAN_F_LEARN;
1624
1625 if (data[IFLA_VXLAN_AGEING])
1626 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1627 else
1628 vxlan->age_interval = FDB_AGE_DEFAULT;
1629
1630 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
1631 vxlan->flags |= VXLAN_F_PROXY;
1632
1633 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
1634 vxlan->flags |= VXLAN_F_RSC;
1635
1636 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
1637 vxlan->flags |= VXLAN_F_L2MISS;
1638
1639 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
1640 vxlan->flags |= VXLAN_F_L3MISS;
1641
1642 if (data[IFLA_VXLAN_LIMIT])
1643 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1644
1645 if (data[IFLA_VXLAN_PORT_RANGE]) {
1646 const struct ifla_vxlan_port_range *p
1647 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1648 vxlan->port_min = ntohs(p->low);
1649 vxlan->port_max = ntohs(p->high);
1650 }
1651
1652 if (data[IFLA_VXLAN_PORT])
1653 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
1654
1655 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
1656 pr_info("duplicate VNI %u\n", vni);
1657 return -EEXIST;
1658 }
1659
1660 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
1661
1662 err = register_netdevice(dev);
1663 if (err)
1664 return err;
1665
1666 list_add(&vxlan->next, &vn->vxlan_list);
1667
1668 return 0;
1669 }
1670
1671 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1672 {
1673 struct vxlan_dev *vxlan = netdev_priv(dev);
1674
1675 hlist_del_rcu(&vxlan->hlist);
1676 list_del(&vxlan->next);
1677 unregister_netdevice_queue(dev, head);
1678 }
1679
1680 static size_t vxlan_get_size(const struct net_device *dev)
1681 {
1682
1683 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
1684 nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
1685 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1686 nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1687 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
1688 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
1689 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
1690 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
1691 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
1692 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
1693 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
1694 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1695 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
1696 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
1697 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
1698 0;
1699 }
1700
1701 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1702 {
1703 const struct vxlan_dev *vxlan = netdev_priv(dev);
1704 const struct vxlan_rdst *dst = &vxlan->default_dst;
1705 struct ifla_vxlan_port_range ports = {
1706 .low = htons(vxlan->port_min),
1707 .high = htons(vxlan->port_max),
1708 };
1709
1710 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
1711 goto nla_put_failure;
1712
1713 if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip))
1714 goto nla_put_failure;
1715
1716 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
1717 goto nla_put_failure;
1718
1719 if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
1720 goto nla_put_failure;
1721
1722 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1723 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
1724 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
1725 !!(vxlan->flags & VXLAN_F_LEARN)) ||
1726 nla_put_u8(skb, IFLA_VXLAN_PROXY,
1727 !!(vxlan->flags & VXLAN_F_PROXY)) ||
1728 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
1729 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
1730 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
1731 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
1732 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
1733 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
1734 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
1735 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
1736 goto nla_put_failure;
1737
1738 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1739 goto nla_put_failure;
1740
1741 return 0;
1742
1743 nla_put_failure:
1744 return -EMSGSIZE;
1745 }
1746
1747 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1748 .kind = "vxlan",
1749 .maxtype = IFLA_VXLAN_MAX,
1750 .policy = vxlan_policy,
1751 .priv_size = sizeof(struct vxlan_dev),
1752 .setup = vxlan_setup,
1753 .validate = vxlan_validate,
1754 .newlink = vxlan_newlink,
1755 .dellink = vxlan_dellink,
1756 .get_size = vxlan_get_size,
1757 .fill_info = vxlan_fill_info,
1758 };
1759
1760 static __net_init int vxlan_init_net(struct net *net)
1761 {
1762 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1763 unsigned int h;
1764
1765 INIT_LIST_HEAD(&vn->vxlan_list);
1766 spin_lock_init(&vn->sock_lock);
1767
1768 for (h = 0; h < PORT_HASH_SIZE; ++h)
1769 INIT_HLIST_HEAD(&vn->sock_list[h]);
1770
1771 return 0;
1772 }
1773
1774 static __net_exit void vxlan_exit_net(struct net *net)
1775 {
1776 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1777 struct vxlan_dev *vxlan;
1778
1779 rtnl_lock();
1780 list_for_each_entry(vxlan, &vn->vxlan_list, next)
1781 dev_close(vxlan->dev);
1782 rtnl_unlock();
1783 }
1784
1785 static struct pernet_operations vxlan_net_ops = {
1786 .init = vxlan_init_net,
1787 .exit = vxlan_exit_net,
1788 .id = &vxlan_net_id,
1789 .size = sizeof(struct vxlan_net),
1790 };
1791
1792 static int __init vxlan_init_module(void)
1793 {
1794 int rc;
1795
1796 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
1797 if (!vxlan_wq)
1798 return -ENOMEM;
1799
1800 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1801
1802 rc = register_pernet_device(&vxlan_net_ops);
1803 if (rc)
1804 goto out1;
1805
1806 rc = rtnl_link_register(&vxlan_link_ops);
1807 if (rc)
1808 goto out2;
1809
1810 return 0;
1811
1812 out2:
1813 unregister_pernet_device(&vxlan_net_ops);
1814 out1:
1815 destroy_workqueue(vxlan_wq);
1816 return rc;
1817 }
1818 late_initcall(vxlan_init_module);
1819
1820 static void __exit vxlan_cleanup_module(void)
1821 {
1822 unregister_pernet_device(&vxlan_net_ops);
1823 rtnl_link_unregister(&vxlan_link_ops);
1824 destroy_workqueue(vxlan_wq);
1825 rcu_barrier();
1826 }
1827 module_exit(vxlan_cleanup_module);
1828
1829 MODULE_LICENSE("GPL");
1830 MODULE_VERSION(VXLAN_VERSION);
1831 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
1832 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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