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