d342894c |
1 | /* |
2 | * VXLAN: Virtual eXtensiable Local Area Network |
3 | * |
4 | * Copyright (c) 2012 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 | * - use IANA UDP port number (when defined) |
12 | * - IPv6 (not in RFC) |
13 | */ |
14 | |
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
16 | |
17 | #include <linux/kernel.h> |
18 | #include <linux/types.h> |
19 | #include <linux/module.h> |
20 | #include <linux/errno.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/skbuff.h> |
23 | #include <linux/rculist.h> |
24 | #include <linux/netdevice.h> |
25 | #include <linux/in.h> |
26 | #include <linux/ip.h> |
27 | #include <linux/udp.h> |
28 | #include <linux/igmp.h> |
29 | #include <linux/etherdevice.h> |
30 | #include <linux/if_ether.h> |
d342894c |
31 | #include <linux/hash.h> |
32 | #include <net/ip.h> |
33 | #include <net/icmp.h> |
34 | #include <net/udp.h> |
35 | #include <net/rtnetlink.h> |
36 | #include <net/route.h> |
37 | #include <net/dsfield.h> |
38 | #include <net/inet_ecn.h> |
39 | #include <net/net_namespace.h> |
40 | #include <net/netns/generic.h> |
41 | |
42 | #define VXLAN_VERSION "0.1" |
43 | |
44 | #define VNI_HASH_BITS 10 |
45 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) |
46 | #define FDB_HASH_BITS 8 |
47 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) |
48 | #define FDB_AGE_DEFAULT 300 /* 5 min */ |
49 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ |
50 | |
51 | #define VXLAN_N_VID (1u << 24) |
52 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) |
53 | /* VLAN + IP header + UDP + VXLAN */ |
54 | #define VXLAN_HEADROOM (4 + 20 + 8 + 8) |
55 | |
56 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ |
57 | |
58 | /* VXLAN protocol header */ |
59 | struct vxlanhdr { |
60 | __be32 vx_flags; |
61 | __be32 vx_vni; |
62 | }; |
63 | |
64 | /* UDP port for VXLAN traffic. */ |
65 | static unsigned int vxlan_port __read_mostly = 8472; |
66 | module_param_named(udp_port, vxlan_port, uint, 0444); |
67 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); |
68 | |
69 | static bool log_ecn_error = true; |
70 | module_param(log_ecn_error, bool, 0644); |
71 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
72 | |
73 | /* per-net private data for this module */ |
74 | static unsigned int vxlan_net_id; |
75 | struct vxlan_net { |
76 | struct socket *sock; /* UDP encap socket */ |
77 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
78 | }; |
79 | |
80 | /* Forwarding table entry */ |
81 | struct vxlan_fdb { |
82 | struct hlist_node hlist; /* linked list of entries */ |
83 | struct rcu_head rcu; |
84 | unsigned long updated; /* jiffies */ |
85 | unsigned long used; |
86 | __be32 remote_ip; |
87 | u16 state; /* see ndm_state */ |
88 | u8 eth_addr[ETH_ALEN]; |
89 | }; |
90 | |
91 | /* Per-cpu network traffic stats */ |
92 | struct vxlan_stats { |
93 | u64 rx_packets; |
94 | u64 rx_bytes; |
95 | u64 tx_packets; |
96 | u64 tx_bytes; |
97 | struct u64_stats_sync syncp; |
98 | }; |
99 | |
100 | /* Pseudo network device */ |
101 | struct vxlan_dev { |
102 | struct hlist_node hlist; |
103 | struct net_device *dev; |
104 | struct vxlan_stats __percpu *stats; |
105 | __u32 vni; /* virtual network id */ |
106 | __be32 gaddr; /* multicast group */ |
107 | __be32 saddr; /* source address */ |
108 | unsigned int link; /* link to multicast over */ |
109 | __u8 tos; /* TOS override */ |
110 | __u8 ttl; |
111 | bool learn; |
112 | |
113 | unsigned long age_interval; |
114 | struct timer_list age_timer; |
115 | spinlock_t hash_lock; |
116 | unsigned int addrcnt; |
117 | unsigned int addrmax; |
118 | unsigned int addrexceeded; |
119 | |
120 | struct hlist_head fdb_head[FDB_HASH_SIZE]; |
121 | }; |
122 | |
123 | /* salt for hash table */ |
124 | static u32 vxlan_salt __read_mostly; |
125 | |
126 | static inline struct hlist_head *vni_head(struct net *net, u32 id) |
127 | { |
128 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
129 | |
130 | return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; |
131 | } |
132 | |
133 | /* Look up VNI in a per net namespace table */ |
134 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) |
135 | { |
136 | struct vxlan_dev *vxlan; |
137 | struct hlist_node *node; |
138 | |
139 | hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) { |
140 | if (vxlan->vni == id) |
141 | return vxlan; |
142 | } |
143 | |
144 | return NULL; |
145 | } |
146 | |
147 | /* Fill in neighbour message in skbuff. */ |
148 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, |
149 | const struct vxlan_fdb *fdb, |
150 | u32 portid, u32 seq, int type, unsigned int flags) |
151 | { |
152 | unsigned long now = jiffies; |
153 | struct nda_cacheinfo ci; |
154 | struct nlmsghdr *nlh; |
155 | struct ndmsg *ndm; |
156 | |
157 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
158 | if (nlh == NULL) |
159 | return -EMSGSIZE; |
160 | |
161 | ndm = nlmsg_data(nlh); |
162 | memset(ndm, 0, sizeof(*ndm)); |
163 | ndm->ndm_family = AF_BRIDGE; |
164 | ndm->ndm_state = fdb->state; |
165 | ndm->ndm_ifindex = vxlan->dev->ifindex; |
166 | ndm->ndm_flags = NTF_SELF; |
167 | ndm->ndm_type = NDA_DST; |
168 | |
169 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
170 | goto nla_put_failure; |
171 | |
172 | if (nla_put_be32(skb, NDA_DST, fdb->remote_ip)) |
173 | goto nla_put_failure; |
174 | |
175 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
176 | ci.ndm_confirmed = 0; |
177 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); |
178 | ci.ndm_refcnt = 0; |
179 | |
180 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
181 | goto nla_put_failure; |
182 | |
183 | return nlmsg_end(skb, nlh); |
184 | |
185 | nla_put_failure: |
186 | nlmsg_cancel(skb, nlh); |
187 | return -EMSGSIZE; |
188 | } |
189 | |
190 | static inline size_t vxlan_nlmsg_size(void) |
191 | { |
192 | return NLMSG_ALIGN(sizeof(struct ndmsg)) |
193 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ |
194 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ |
195 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
196 | } |
197 | |
198 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, |
199 | const struct vxlan_fdb *fdb, int type) |
200 | { |
201 | struct net *net = dev_net(vxlan->dev); |
202 | struct sk_buff *skb; |
203 | int err = -ENOBUFS; |
204 | |
205 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); |
206 | if (skb == NULL) |
207 | goto errout; |
208 | |
209 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0); |
210 | if (err < 0) { |
211 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ |
212 | WARN_ON(err == -EMSGSIZE); |
213 | kfree_skb(skb); |
214 | goto errout; |
215 | } |
216 | |
217 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
218 | return; |
219 | errout: |
220 | if (err < 0) |
221 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
222 | } |
223 | |
224 | /* Hash Ethernet address */ |
225 | static u32 eth_hash(const unsigned char *addr) |
226 | { |
227 | u64 value = get_unaligned((u64 *)addr); |
228 | |
229 | /* only want 6 bytes */ |
230 | #ifdef __BIG_ENDIAN |
231 | value <<= 16; |
232 | #else |
233 | value >>= 16; |
234 | #endif |
235 | return hash_64(value, FDB_HASH_BITS); |
236 | } |
237 | |
238 | /* Hash chain to use given mac address */ |
239 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, |
240 | const u8 *mac) |
241 | { |
242 | return &vxlan->fdb_head[eth_hash(mac)]; |
243 | } |
244 | |
245 | /* Look up Ethernet address in forwarding table */ |
246 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, |
247 | const u8 *mac) |
248 | |
249 | { |
250 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); |
251 | struct vxlan_fdb *f; |
252 | struct hlist_node *node; |
253 | |
254 | hlist_for_each_entry_rcu(f, node, head, hlist) { |
255 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
256 | return f; |
257 | } |
258 | |
259 | return NULL; |
260 | } |
261 | |
262 | /* Add new entry to forwarding table -- assumes lock held */ |
263 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, |
264 | const u8 *mac, __be32 ip, |
265 | __u16 state, __u16 flags) |
266 | { |
267 | struct vxlan_fdb *f; |
268 | int notify = 0; |
269 | |
270 | f = vxlan_find_mac(vxlan, mac); |
271 | if (f) { |
272 | if (flags & NLM_F_EXCL) { |
273 | netdev_dbg(vxlan->dev, |
274 | "lost race to create %pM\n", mac); |
275 | return -EEXIST; |
276 | } |
277 | if (f->state != state) { |
278 | f->state = state; |
279 | f->updated = jiffies; |
280 | notify = 1; |
281 | } |
282 | } else { |
283 | if (!(flags & NLM_F_CREATE)) |
284 | return -ENOENT; |
285 | |
286 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) |
287 | return -ENOSPC; |
288 | |
289 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); |
290 | f = kmalloc(sizeof(*f), GFP_ATOMIC); |
291 | if (!f) |
292 | return -ENOMEM; |
293 | |
294 | notify = 1; |
295 | f->remote_ip = ip; |
296 | f->state = state; |
297 | f->updated = f->used = jiffies; |
298 | memcpy(f->eth_addr, mac, ETH_ALEN); |
299 | |
300 | ++vxlan->addrcnt; |
301 | hlist_add_head_rcu(&f->hlist, |
302 | vxlan_fdb_head(vxlan, mac)); |
303 | } |
304 | |
305 | if (notify) |
306 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); |
307 | |
308 | return 0; |
309 | } |
310 | |
311 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
312 | { |
313 | netdev_dbg(vxlan->dev, |
314 | "delete %pM\n", f->eth_addr); |
315 | |
316 | --vxlan->addrcnt; |
317 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); |
318 | |
319 | hlist_del_rcu(&f->hlist); |
320 | kfree_rcu(f, rcu); |
321 | } |
322 | |
323 | /* Add static entry (via netlink) */ |
324 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
325 | struct net_device *dev, |
326 | const unsigned char *addr, u16 flags) |
327 | { |
328 | struct vxlan_dev *vxlan = netdev_priv(dev); |
329 | __be32 ip; |
330 | int err; |
331 | |
332 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { |
333 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", |
334 | ndm->ndm_state); |
335 | return -EINVAL; |
336 | } |
337 | |
338 | if (tb[NDA_DST] == NULL) |
339 | return -EINVAL; |
340 | |
341 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) |
342 | return -EAFNOSUPPORT; |
343 | |
344 | ip = nla_get_be32(tb[NDA_DST]); |
345 | |
346 | spin_lock_bh(&vxlan->hash_lock); |
347 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags); |
348 | spin_unlock_bh(&vxlan->hash_lock); |
349 | |
350 | return err; |
351 | } |
352 | |
353 | /* Delete entry (via netlink) */ |
354 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct net_device *dev, |
355 | const unsigned char *addr) |
356 | { |
357 | struct vxlan_dev *vxlan = netdev_priv(dev); |
358 | struct vxlan_fdb *f; |
359 | int err = -ENOENT; |
360 | |
361 | spin_lock_bh(&vxlan->hash_lock); |
362 | f = vxlan_find_mac(vxlan, addr); |
363 | if (f) { |
364 | vxlan_fdb_destroy(vxlan, f); |
365 | err = 0; |
366 | } |
367 | spin_unlock_bh(&vxlan->hash_lock); |
368 | |
369 | return err; |
370 | } |
371 | |
372 | /* Dump forwarding table */ |
373 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, |
374 | struct net_device *dev, int idx) |
375 | { |
376 | struct vxlan_dev *vxlan = netdev_priv(dev); |
377 | unsigned int h; |
378 | |
379 | for (h = 0; h < FDB_HASH_SIZE; ++h) { |
380 | struct vxlan_fdb *f; |
381 | struct hlist_node *n; |
382 | int err; |
383 | |
384 | hlist_for_each_entry_rcu(f, n, &vxlan->fdb_head[h], hlist) { |
385 | if (idx < cb->args[0]) |
386 | goto skip; |
387 | |
388 | err = vxlan_fdb_info(skb, vxlan, f, |
389 | NETLINK_CB(cb->skb).portid, |
390 | cb->nlh->nlmsg_seq, |
391 | RTM_NEWNEIGH, |
392 | NLM_F_MULTI); |
393 | if (err < 0) |
394 | break; |
395 | skip: |
396 | ++idx; |
397 | } |
398 | } |
399 | |
400 | return idx; |
401 | } |
402 | |
403 | /* Watch incoming packets to learn mapping between Ethernet address |
404 | * and Tunnel endpoint. |
405 | */ |
406 | static void vxlan_snoop(struct net_device *dev, |
407 | __be32 src_ip, const u8 *src_mac) |
408 | { |
409 | struct vxlan_dev *vxlan = netdev_priv(dev); |
410 | struct vxlan_fdb *f; |
411 | int err; |
412 | |
413 | f = vxlan_find_mac(vxlan, src_mac); |
414 | if (likely(f)) { |
415 | f->used = jiffies; |
416 | if (likely(f->remote_ip == src_ip)) |
417 | return; |
418 | |
419 | if (net_ratelimit()) |
420 | netdev_info(dev, |
421 | "%pM migrated from %pI4 to %pI4\n", |
422 | src_mac, &f->remote_ip, &src_ip); |
423 | |
424 | f->remote_ip = src_ip; |
425 | f->updated = jiffies; |
426 | } else { |
427 | /* learned new entry */ |
428 | spin_lock(&vxlan->hash_lock); |
429 | err = vxlan_fdb_create(vxlan, src_mac, src_ip, |
430 | NUD_REACHABLE, |
431 | NLM_F_EXCL|NLM_F_CREATE); |
432 | spin_unlock(&vxlan->hash_lock); |
433 | } |
434 | } |
435 | |
436 | |
437 | /* See if multicast group is already in use by other ID */ |
438 | static bool vxlan_group_used(struct vxlan_net *vn, |
439 | const struct vxlan_dev *this) |
440 | { |
441 | const struct vxlan_dev *vxlan; |
442 | struct hlist_node *node; |
443 | unsigned h; |
444 | |
445 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
446 | hlist_for_each_entry(vxlan, node, &vn->vni_list[h], hlist) { |
447 | if (vxlan == this) |
448 | continue; |
449 | |
450 | if (!netif_running(vxlan->dev)) |
451 | continue; |
452 | |
453 | if (vxlan->gaddr == this->gaddr) |
454 | return true; |
455 | } |
456 | |
457 | return false; |
458 | } |
459 | |
460 | /* kernel equivalent to IP_ADD_MEMBERSHIP */ |
461 | static int vxlan_join_group(struct net_device *dev) |
462 | { |
463 | struct vxlan_dev *vxlan = netdev_priv(dev); |
464 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); |
465 | struct sock *sk = vn->sock->sk; |
466 | struct ip_mreqn mreq = { |
467 | .imr_multiaddr.s_addr = vxlan->gaddr, |
468 | }; |
469 | int err; |
470 | |
471 | /* Already a member of group */ |
472 | if (vxlan_group_used(vn, vxlan)) |
473 | return 0; |
474 | |
475 | /* Need to drop RTNL to call multicast join */ |
476 | rtnl_unlock(); |
477 | lock_sock(sk); |
478 | err = ip_mc_join_group(sk, &mreq); |
479 | release_sock(sk); |
480 | rtnl_lock(); |
481 | |
482 | return err; |
483 | } |
484 | |
485 | |
486 | /* kernel equivalent to IP_DROP_MEMBERSHIP */ |
487 | static int vxlan_leave_group(struct net_device *dev) |
488 | { |
489 | struct vxlan_dev *vxlan = netdev_priv(dev); |
490 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); |
491 | int err = 0; |
492 | struct sock *sk = vn->sock->sk; |
493 | struct ip_mreqn mreq = { |
494 | .imr_multiaddr.s_addr = vxlan->gaddr, |
495 | }; |
496 | |
497 | /* Only leave group when last vxlan is done. */ |
498 | if (vxlan_group_used(vn, vxlan)) |
499 | return 0; |
500 | |
501 | /* Need to drop RTNL to call multicast leave */ |
502 | rtnl_unlock(); |
503 | lock_sock(sk); |
504 | err = ip_mc_leave_group(sk, &mreq); |
505 | release_sock(sk); |
506 | rtnl_lock(); |
507 | |
508 | return err; |
509 | } |
510 | |
511 | /* Callback from net/ipv4/udp.c to receive packets */ |
512 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) |
513 | { |
514 | struct iphdr *oip; |
515 | struct vxlanhdr *vxh; |
516 | struct vxlan_dev *vxlan; |
517 | struct vxlan_stats *stats; |
518 | __u32 vni; |
519 | int err; |
520 | |
521 | /* pop off outer UDP header */ |
522 | __skb_pull(skb, sizeof(struct udphdr)); |
523 | |
524 | /* Need Vxlan and inner Ethernet header to be present */ |
525 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) |
526 | goto error; |
527 | |
528 | /* Drop packets with reserved bits set */ |
529 | vxh = (struct vxlanhdr *) skb->data; |
530 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || |
531 | (vxh->vx_vni & htonl(0xff))) { |
532 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", |
533 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); |
534 | goto error; |
535 | } |
536 | |
537 | __skb_pull(skb, sizeof(struct vxlanhdr)); |
538 | skb_postpull_rcsum(skb, eth_hdr(skb), sizeof(struct vxlanhdr)); |
539 | |
540 | /* Is this VNI defined? */ |
541 | vni = ntohl(vxh->vx_vni) >> 8; |
542 | vxlan = vxlan_find_vni(sock_net(sk), vni); |
543 | if (!vxlan) { |
544 | netdev_dbg(skb->dev, "unknown vni %d\n", vni); |
545 | goto drop; |
546 | } |
547 | |
548 | if (!pskb_may_pull(skb, ETH_HLEN)) { |
549 | vxlan->dev->stats.rx_length_errors++; |
550 | vxlan->dev->stats.rx_errors++; |
551 | goto drop; |
552 | } |
553 | |
554 | /* Re-examine inner Ethernet packet */ |
555 | oip = ip_hdr(skb); |
556 | skb->protocol = eth_type_trans(skb, vxlan->dev); |
557 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
558 | |
559 | /* Ignore packet loops (and multicast echo) */ |
560 | if (compare_ether_addr(eth_hdr(skb)->h_source, |
561 | vxlan->dev->dev_addr) == 0) |
562 | goto drop; |
563 | |
564 | if (vxlan->learn) |
565 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source); |
566 | |
567 | __skb_tunnel_rx(skb, vxlan->dev); |
568 | skb_reset_network_header(skb); |
569 | |
570 | err = IP_ECN_decapsulate(oip, skb); |
571 | if (unlikely(err)) { |
572 | if (log_ecn_error) |
573 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
574 | &oip->saddr, oip->tos); |
575 | if (err > 1) { |
576 | ++vxlan->dev->stats.rx_frame_errors; |
577 | ++vxlan->dev->stats.rx_errors; |
578 | goto drop; |
579 | } |
580 | } |
581 | |
582 | stats = this_cpu_ptr(vxlan->stats); |
583 | u64_stats_update_begin(&stats->syncp); |
584 | stats->rx_packets++; |
585 | stats->rx_bytes += skb->len; |
586 | u64_stats_update_end(&stats->syncp); |
587 | |
588 | netif_rx(skb); |
589 | |
590 | return 0; |
591 | error: |
592 | /* Put UDP header back */ |
593 | __skb_push(skb, sizeof(struct udphdr)); |
594 | |
595 | return 1; |
596 | drop: |
597 | /* Consume bad packet */ |
598 | kfree_skb(skb); |
599 | return 0; |
600 | } |
601 | |
602 | /* Extract dsfield from inner protocol */ |
603 | static inline u8 vxlan_get_dsfield(const struct iphdr *iph, |
604 | const struct sk_buff *skb) |
605 | { |
606 | if (skb->protocol == htons(ETH_P_IP)) |
607 | return iph->tos; |
608 | else if (skb->protocol == htons(ETH_P_IPV6)) |
609 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); |
610 | else |
611 | return 0; |
612 | } |
613 | |
614 | /* Propogate ECN bits out */ |
615 | static inline u8 vxlan_ecn_encap(u8 tos, |
616 | const struct iphdr *iph, |
617 | const struct sk_buff *skb) |
618 | { |
619 | u8 inner = vxlan_get_dsfield(iph, skb); |
620 | |
621 | return INET_ECN_encapsulate(tos, inner); |
622 | } |
623 | |
ef59febe |
624 | static __be32 vxlan_find_dst(struct vxlan_dev *vxlan, struct sk_buff *skb) |
625 | { |
626 | const struct ethhdr *eth = (struct ethhdr *) skb->data; |
627 | const struct vxlan_fdb *f; |
628 | |
629 | if (is_multicast_ether_addr(eth->h_dest)) |
630 | return vxlan->gaddr; |
631 | |
632 | f = vxlan_find_mac(vxlan, eth->h_dest); |
633 | if (f) |
634 | return f->remote_ip; |
635 | else |
636 | return vxlan->gaddr; |
637 | |
638 | } |
639 | |
d342894c |
640 | /* Transmit local packets over Vxlan |
641 | * |
642 | * Outer IP header inherits ECN and DF from inner header. |
643 | * Outer UDP destination is the VXLAN assigned port. |
644 | * source port is based on hash of flow if available |
645 | * otherwise use a random value |
646 | */ |
647 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) |
648 | { |
649 | struct vxlan_dev *vxlan = netdev_priv(dev); |
650 | struct rtable *rt; |
d342894c |
651 | const struct iphdr *old_iph; |
652 | struct iphdr *iph; |
653 | struct vxlanhdr *vxh; |
654 | struct udphdr *uh; |
655 | struct flowi4 fl4; |
d342894c |
656 | unsigned int pkt_len = skb->len; |
657 | u32 hash; |
658 | __be32 dst; |
659 | __be16 df = 0; |
660 | __u8 tos, ttl; |
661 | int err; |
662 | |
ef59febe |
663 | dst = vxlan_find_dst(vxlan, skb); |
664 | if (!dst) |
665 | goto drop; |
666 | |
d342894c |
667 | /* Need space for new headers (invalidates iph ptr) */ |
668 | if (skb_cow_head(skb, VXLAN_HEADROOM)) |
669 | goto drop; |
670 | |
d342894c |
671 | old_iph = ip_hdr(skb); |
672 | |
d342894c |
673 | ttl = vxlan->ttl; |
674 | if (!ttl && IN_MULTICAST(ntohl(dst))) |
675 | ttl = 1; |
676 | |
677 | tos = vxlan->tos; |
678 | if (tos == 1) |
679 | tos = vxlan_get_dsfield(old_iph, skb); |
680 | |
681 | hash = skb_get_rxhash(skb); |
682 | |
683 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, |
684 | vxlan->saddr, vxlan->vni, |
685 | RT_TOS(tos), vxlan->link); |
686 | if (IS_ERR(rt)) { |
687 | netdev_dbg(dev, "no route to %pI4\n", &dst); |
688 | dev->stats.tx_carrier_errors++; |
689 | goto tx_error; |
690 | } |
691 | |
692 | if (rt->dst.dev == dev) { |
693 | netdev_dbg(dev, "circular route to %pI4\n", &dst); |
694 | ip_rt_put(rt); |
695 | dev->stats.collisions++; |
696 | goto tx_error; |
697 | } |
698 | |
699 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
700 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
701 | IPSKB_REROUTED); |
702 | skb_dst_drop(skb); |
703 | skb_dst_set(skb, &rt->dst); |
704 | |
705 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); |
706 | vxh->vx_flags = htonl(VXLAN_FLAGS); |
707 | vxh->vx_vni = htonl(vxlan->vni << 8); |
708 | |
709 | __skb_push(skb, sizeof(*uh)); |
710 | skb_reset_transport_header(skb); |
711 | uh = udp_hdr(skb); |
712 | |
713 | uh->dest = htons(vxlan_port); |
714 | uh->source = hash ? :random32(); |
715 | |
716 | uh->len = htons(skb->len); |
717 | uh->check = 0; |
718 | |
719 | __skb_push(skb, sizeof(*iph)); |
720 | skb_reset_network_header(skb); |
721 | iph = ip_hdr(skb); |
722 | iph->version = 4; |
723 | iph->ihl = sizeof(struct iphdr) >> 2; |
724 | iph->frag_off = df; |
725 | iph->protocol = IPPROTO_UDP; |
726 | iph->tos = vxlan_ecn_encap(tos, old_iph, skb); |
727 | iph->daddr = fl4.daddr; |
728 | iph->saddr = fl4.saddr; |
729 | iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
730 | |
731 | /* See __IPTUNNEL_XMIT */ |
732 | skb->ip_summed = CHECKSUM_NONE; |
733 | ip_select_ident(iph, &rt->dst, NULL); |
734 | |
735 | err = ip_local_out(skb); |
736 | if (likely(net_xmit_eval(err) == 0)) { |
737 | struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats); |
738 | |
739 | u64_stats_update_begin(&stats->syncp); |
740 | stats->tx_packets++; |
741 | stats->tx_bytes += pkt_len; |
742 | u64_stats_update_end(&stats->syncp); |
743 | } else { |
744 | dev->stats.tx_errors++; |
745 | dev->stats.tx_aborted_errors++; |
746 | } |
747 | return NETDEV_TX_OK; |
748 | |
749 | drop: |
750 | dev->stats.tx_dropped++; |
751 | goto tx_free; |
752 | |
753 | tx_error: |
754 | dev->stats.tx_errors++; |
755 | tx_free: |
756 | dev_kfree_skb(skb); |
757 | return NETDEV_TX_OK; |
758 | } |
759 | |
760 | /* Walk the forwarding table and purge stale entries */ |
761 | static void vxlan_cleanup(unsigned long arg) |
762 | { |
763 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; |
764 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; |
765 | unsigned int h; |
766 | |
767 | if (!netif_running(vxlan->dev)) |
768 | return; |
769 | |
770 | spin_lock_bh(&vxlan->hash_lock); |
771 | for (h = 0; h < FDB_HASH_SIZE; ++h) { |
772 | struct hlist_node *p, *n; |
773 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { |
774 | struct vxlan_fdb *f |
775 | = container_of(p, struct vxlan_fdb, hlist); |
776 | unsigned long timeout; |
777 | |
778 | if (f->state == NUD_PERMANENT) |
779 | continue; |
780 | |
781 | timeout = f->used + vxlan->age_interval * HZ; |
782 | if (time_before_eq(timeout, jiffies)) { |
783 | netdev_dbg(vxlan->dev, |
784 | "garbage collect %pM\n", |
785 | f->eth_addr); |
786 | f->state = NUD_STALE; |
787 | vxlan_fdb_destroy(vxlan, f); |
788 | } else if (time_before(timeout, next_timer)) |
789 | next_timer = timeout; |
790 | } |
791 | } |
792 | spin_unlock_bh(&vxlan->hash_lock); |
793 | |
794 | mod_timer(&vxlan->age_timer, next_timer); |
795 | } |
796 | |
797 | /* Setup stats when device is created */ |
798 | static int vxlan_init(struct net_device *dev) |
799 | { |
800 | struct vxlan_dev *vxlan = netdev_priv(dev); |
801 | |
802 | vxlan->stats = alloc_percpu(struct vxlan_stats); |
803 | if (!vxlan->stats) |
804 | return -ENOMEM; |
805 | |
806 | return 0; |
807 | } |
808 | |
809 | /* Start ageing timer and join group when device is brought up */ |
810 | static int vxlan_open(struct net_device *dev) |
811 | { |
812 | struct vxlan_dev *vxlan = netdev_priv(dev); |
813 | int err; |
814 | |
815 | if (vxlan->gaddr) { |
816 | err = vxlan_join_group(dev); |
817 | if (err) |
818 | return err; |
819 | } |
820 | |
821 | if (vxlan->age_interval) |
822 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); |
823 | |
824 | return 0; |
825 | } |
826 | |
827 | /* Purge the forwarding table */ |
828 | static void vxlan_flush(struct vxlan_dev *vxlan) |
829 | { |
830 | unsigned h; |
831 | |
832 | spin_lock_bh(&vxlan->hash_lock); |
833 | for (h = 0; h < FDB_HASH_SIZE; ++h) { |
834 | struct hlist_node *p, *n; |
835 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { |
836 | struct vxlan_fdb *f |
837 | = container_of(p, struct vxlan_fdb, hlist); |
838 | vxlan_fdb_destroy(vxlan, f); |
839 | } |
840 | } |
841 | spin_unlock_bh(&vxlan->hash_lock); |
842 | } |
843 | |
844 | /* Cleanup timer and forwarding table on shutdown */ |
845 | static int vxlan_stop(struct net_device *dev) |
846 | { |
847 | struct vxlan_dev *vxlan = netdev_priv(dev); |
848 | |
849 | if (vxlan->gaddr) |
850 | vxlan_leave_group(dev); |
851 | |
852 | del_timer_sync(&vxlan->age_timer); |
853 | |
854 | vxlan_flush(vxlan); |
855 | |
856 | return 0; |
857 | } |
858 | |
859 | /* Merge per-cpu statistics */ |
860 | static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev, |
861 | struct rtnl_link_stats64 *stats) |
862 | { |
863 | struct vxlan_dev *vxlan = netdev_priv(dev); |
864 | struct vxlan_stats tmp, sum = { 0 }; |
865 | unsigned int cpu; |
866 | |
867 | for_each_possible_cpu(cpu) { |
868 | unsigned int start; |
869 | const struct vxlan_stats *stats |
870 | = per_cpu_ptr(vxlan->stats, cpu); |
871 | |
872 | do { |
873 | start = u64_stats_fetch_begin_bh(&stats->syncp); |
874 | memcpy(&tmp, stats, sizeof(tmp)); |
875 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); |
876 | |
877 | sum.tx_bytes += tmp.tx_bytes; |
878 | sum.tx_packets += tmp.tx_packets; |
879 | sum.rx_bytes += tmp.rx_bytes; |
880 | sum.rx_packets += tmp.rx_packets; |
881 | } |
882 | |
883 | stats->tx_bytes = sum.tx_bytes; |
884 | stats->tx_packets = sum.tx_packets; |
885 | stats->rx_bytes = sum.rx_bytes; |
886 | stats->rx_packets = sum.rx_packets; |
887 | |
888 | stats->multicast = dev->stats.multicast; |
889 | stats->rx_length_errors = dev->stats.rx_length_errors; |
890 | stats->rx_frame_errors = dev->stats.rx_frame_errors; |
891 | stats->rx_errors = dev->stats.rx_errors; |
892 | |
893 | stats->tx_dropped = dev->stats.tx_dropped; |
894 | stats->tx_carrier_errors = dev->stats.tx_carrier_errors; |
895 | stats->tx_aborted_errors = dev->stats.tx_aborted_errors; |
896 | stats->collisions = dev->stats.collisions; |
897 | stats->tx_errors = dev->stats.tx_errors; |
898 | |
899 | return stats; |
900 | } |
901 | |
902 | /* Stub, nothing needs to be done. */ |
903 | static void vxlan_set_multicast_list(struct net_device *dev) |
904 | { |
905 | } |
906 | |
907 | static const struct net_device_ops vxlan_netdev_ops = { |
908 | .ndo_init = vxlan_init, |
909 | .ndo_open = vxlan_open, |
910 | .ndo_stop = vxlan_stop, |
911 | .ndo_start_xmit = vxlan_xmit, |
912 | .ndo_get_stats64 = vxlan_stats64, |
913 | .ndo_set_rx_mode = vxlan_set_multicast_list, |
914 | .ndo_change_mtu = eth_change_mtu, |
915 | .ndo_validate_addr = eth_validate_addr, |
916 | .ndo_set_mac_address = eth_mac_addr, |
917 | .ndo_fdb_add = vxlan_fdb_add, |
918 | .ndo_fdb_del = vxlan_fdb_delete, |
919 | .ndo_fdb_dump = vxlan_fdb_dump, |
920 | }; |
921 | |
922 | /* Info for udev, that this is a virtual tunnel endpoint */ |
923 | static struct device_type vxlan_type = { |
924 | .name = "vxlan", |
925 | }; |
926 | |
927 | static void vxlan_free(struct net_device *dev) |
928 | { |
929 | struct vxlan_dev *vxlan = netdev_priv(dev); |
930 | |
931 | free_percpu(vxlan->stats); |
932 | free_netdev(dev); |
933 | } |
934 | |
935 | /* Initialize the device structure. */ |
936 | static void vxlan_setup(struct net_device *dev) |
937 | { |
938 | struct vxlan_dev *vxlan = netdev_priv(dev); |
939 | unsigned h; |
940 | |
941 | eth_hw_addr_random(dev); |
942 | ether_setup(dev); |
943 | |
944 | dev->netdev_ops = &vxlan_netdev_ops; |
945 | dev->destructor = vxlan_free; |
946 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); |
947 | |
948 | dev->tx_queue_len = 0; |
949 | dev->features |= NETIF_F_LLTX; |
950 | dev->features |= NETIF_F_NETNS_LOCAL; |
951 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
952 | |
953 | spin_lock_init(&vxlan->hash_lock); |
954 | |
955 | init_timer_deferrable(&vxlan->age_timer); |
956 | vxlan->age_timer.function = vxlan_cleanup; |
957 | vxlan->age_timer.data = (unsigned long) vxlan; |
958 | |
959 | vxlan->dev = dev; |
960 | |
961 | for (h = 0; h < FDB_HASH_SIZE; ++h) |
962 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); |
963 | } |
964 | |
965 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { |
966 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, |
967 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
968 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, |
969 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
970 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, |
971 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, |
972 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, |
973 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, |
974 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, |
975 | }; |
976 | |
977 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) |
978 | { |
979 | if (tb[IFLA_ADDRESS]) { |
980 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
981 | pr_debug("invalid link address (not ethernet)\n"); |
982 | return -EINVAL; |
983 | } |
984 | |
985 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { |
986 | pr_debug("invalid all zero ethernet address\n"); |
987 | return -EADDRNOTAVAIL; |
988 | } |
989 | } |
990 | |
991 | if (!data) |
992 | return -EINVAL; |
993 | |
994 | if (data[IFLA_VXLAN_ID]) { |
995 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); |
996 | if (id >= VXLAN_VID_MASK) |
997 | return -ERANGE; |
998 | } |
999 | |
1000 | if (data[IFLA_VXLAN_GROUP]) { |
1001 | __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); |
1002 | if (!IN_MULTICAST(ntohl(gaddr))) { |
1003 | pr_debug("group address is not IPv4 multicast\n"); |
1004 | return -EADDRNOTAVAIL; |
1005 | } |
1006 | } |
1007 | return 0; |
1008 | } |
1009 | |
1010 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1011 | struct nlattr *tb[], struct nlattr *data[]) |
1012 | { |
1013 | struct vxlan_dev *vxlan = netdev_priv(dev); |
1014 | __u32 vni; |
1015 | int err; |
1016 | |
1017 | if (!data[IFLA_VXLAN_ID]) |
1018 | return -EINVAL; |
1019 | |
1020 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); |
1021 | if (vxlan_find_vni(net, vni)) { |
1022 | pr_info("duplicate VNI %u\n", vni); |
1023 | return -EEXIST; |
1024 | } |
1025 | vxlan->vni = vni; |
1026 | |
1027 | if (data[IFLA_VXLAN_GROUP]) |
1028 | vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); |
1029 | |
1030 | if (data[IFLA_VXLAN_LOCAL]) |
1031 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); |
1032 | |
1033 | if (data[IFLA_VXLAN_LINK]) { |
1034 | vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]); |
1035 | |
1036 | if (!tb[IFLA_MTU]) { |
1037 | struct net_device *lowerdev; |
1038 | lowerdev = __dev_get_by_index(net, vxlan->link); |
1039 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1040 | } |
1041 | } |
1042 | |
1043 | if (data[IFLA_VXLAN_TOS]) |
1044 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); |
1045 | |
1046 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
1047 | vxlan->learn = true; |
1048 | |
1049 | if (data[IFLA_VXLAN_AGEING]) |
1050 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); |
1051 | else |
1052 | vxlan->age_interval = FDB_AGE_DEFAULT; |
1053 | |
1054 | if (data[IFLA_VXLAN_LIMIT]) |
1055 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); |
1056 | |
1057 | err = register_netdevice(dev); |
1058 | if (!err) |
1059 | hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni)); |
1060 | |
1061 | return err; |
1062 | } |
1063 | |
1064 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) |
1065 | { |
1066 | struct vxlan_dev *vxlan = netdev_priv(dev); |
1067 | |
1068 | hlist_del_rcu(&vxlan->hlist); |
1069 | |
1070 | unregister_netdevice_queue(dev, head); |
1071 | } |
1072 | |
1073 | static size_t vxlan_get_size(const struct net_device *dev) |
1074 | { |
1075 | |
1076 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ |
1077 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ |
1078 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ |
1079 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ |
1080 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ |
1081 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ |
1082 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ |
1083 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1084 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ |
1085 | 0; |
1086 | } |
1087 | |
1088 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) |
1089 | { |
1090 | const struct vxlan_dev *vxlan = netdev_priv(dev); |
1091 | |
1092 | if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni)) |
1093 | goto nla_put_failure; |
1094 | |
7c41c42c |
1095 | if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr)) |
d342894c |
1096 | goto nla_put_failure; |
1097 | |
1098 | if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link)) |
1099 | goto nla_put_failure; |
1100 | |
7c41c42c |
1101 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c |
1102 | goto nla_put_failure; |
1103 | |
1104 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || |
1105 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || |
1106 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, vxlan->learn) || |
1107 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
1108 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax)) |
1109 | goto nla_put_failure; |
1110 | |
1111 | return 0; |
1112 | |
1113 | nla_put_failure: |
1114 | return -EMSGSIZE; |
1115 | } |
1116 | |
1117 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { |
1118 | .kind = "vxlan", |
1119 | .maxtype = IFLA_VXLAN_MAX, |
1120 | .policy = vxlan_policy, |
1121 | .priv_size = sizeof(struct vxlan_dev), |
1122 | .setup = vxlan_setup, |
1123 | .validate = vxlan_validate, |
1124 | .newlink = vxlan_newlink, |
1125 | .dellink = vxlan_dellink, |
1126 | .get_size = vxlan_get_size, |
1127 | .fill_info = vxlan_fill_info, |
1128 | }; |
1129 | |
1130 | static __net_init int vxlan_init_net(struct net *net) |
1131 | { |
1132 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
1133 | struct sock *sk; |
1134 | struct sockaddr_in vxlan_addr = { |
1135 | .sin_family = AF_INET, |
1136 | .sin_addr.s_addr = htonl(INADDR_ANY), |
1137 | }; |
1138 | int rc; |
1139 | unsigned h; |
1140 | |
1141 | /* Create UDP socket for encapsulation receive. */ |
1142 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); |
1143 | if (rc < 0) { |
1144 | pr_debug("UDP socket create failed\n"); |
1145 | return rc; |
1146 | } |
bfe1b9b1 |
1147 | /* Put in proper namespace */ |
1148 | sk = vn->sock->sk; |
1149 | sk_change_net(sk, net); |
d342894c |
1150 | |
1151 | vxlan_addr.sin_port = htons(vxlan_port); |
1152 | |
1153 | rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr, |
1154 | sizeof(vxlan_addr)); |
1155 | if (rc < 0) { |
1156 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", |
1157 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); |
bfe1b9b1 |
1158 | sk_release_kernel(sk); |
d342894c |
1159 | vn->sock = NULL; |
1160 | return rc; |
1161 | } |
1162 | |
1163 | /* Disable multicast loopback */ |
d342894c |
1164 | inet_sk(sk)->mc_loop = 0; |
1165 | |
1166 | /* Mark socket as an encapsulation socket. */ |
1167 | udp_sk(sk)->encap_type = 1; |
1168 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; |
1169 | udp_encap_enable(); |
1170 | |
1171 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
1172 | INIT_HLIST_HEAD(&vn->vni_list[h]); |
1173 | |
1174 | return 0; |
1175 | } |
1176 | |
1177 | static __net_exit void vxlan_exit_net(struct net *net) |
1178 | { |
1179 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
1180 | |
1181 | if (vn->sock) { |
bfe1b9b1 |
1182 | sk_release_kernel(vn->sock->sk); |
d342894c |
1183 | vn->sock = NULL; |
1184 | } |
1185 | } |
1186 | |
1187 | static struct pernet_operations vxlan_net_ops = { |
1188 | .init = vxlan_init_net, |
1189 | .exit = vxlan_exit_net, |
1190 | .id = &vxlan_net_id, |
1191 | .size = sizeof(struct vxlan_net), |
1192 | }; |
1193 | |
1194 | static int __init vxlan_init_module(void) |
1195 | { |
1196 | int rc; |
1197 | |
1198 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); |
1199 | |
1200 | rc = register_pernet_device(&vxlan_net_ops); |
1201 | if (rc) |
1202 | goto out1; |
1203 | |
1204 | rc = rtnl_link_register(&vxlan_link_ops); |
1205 | if (rc) |
1206 | goto out2; |
1207 | |
1208 | return 0; |
1209 | |
1210 | out2: |
1211 | unregister_pernet_device(&vxlan_net_ops); |
1212 | out1: |
1213 | return rc; |
1214 | } |
1215 | module_init(vxlan_init_module); |
1216 | |
1217 | static void __exit vxlan_cleanup_module(void) |
1218 | { |
1219 | rtnl_link_unregister(&vxlan_link_ops); |
1220 | unregister_pernet_device(&vxlan_net_ops); |
1221 | } |
1222 | module_exit(vxlan_cleanup_module); |
1223 | |
1224 | MODULE_LICENSE("GPL"); |
1225 | MODULE_VERSION(VXLAN_VERSION); |
1226 | MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>"); |
1227 | MODULE_ALIAS_RTNL_LINK("vxlan"); |