Commit | Line | Data |
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d342894c | 1 | /* |
eb5ce439 | 2 | * VXLAN: Virtual eXtensible Local Area Network |
d342894c | 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> |
1b13c97f | 32 | #include <linux/ethtool.h> |
e4f67add DS |
33 | #include <net/arp.h> |
34 | #include <net/ndisc.h> | |
d342894c | 35 | #include <net/ip.h> |
8dc98eb2 | 36 | #include <net/ipip.h> |
d342894c | 37 | #include <net/icmp.h> |
38 | #include <net/udp.h> | |
39 | #include <net/rtnetlink.h> | |
40 | #include <net/route.h> | |
41 | #include <net/dsfield.h> | |
42 | #include <net/inet_ecn.h> | |
43 | #include <net/net_namespace.h> | |
44 | #include <net/netns/generic.h> | |
45 | ||
46 | #define VXLAN_VERSION "0.1" | |
47 | ||
48 | #define VNI_HASH_BITS 10 | |
49 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
50 | #define FDB_HASH_BITS 8 | |
51 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) | |
52 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
53 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
54 | ||
55 | #define VXLAN_N_VID (1u << 24) | |
56 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
52b702ff AD |
57 | /* IP header + UDP + VXLAN + Ethernet header */ |
58 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
d342894c | 59 | |
60 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ | |
61 | ||
62 | /* VXLAN protocol header */ | |
63 | struct vxlanhdr { | |
64 | __be32 vx_flags; | |
65 | __be32 vx_vni; | |
66 | }; | |
67 | ||
68 | /* UDP port for VXLAN traffic. */ | |
69 | static unsigned int vxlan_port __read_mostly = 8472; | |
70 | module_param_named(udp_port, vxlan_port, uint, 0444); | |
71 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); | |
72 | ||
73 | static bool log_ecn_error = true; | |
74 | module_param(log_ecn_error, bool, 0644); | |
75 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
76 | ||
77 | /* per-net private data for this module */ | |
78 | static unsigned int vxlan_net_id; | |
79 | struct vxlan_net { | |
80 | struct socket *sock; /* UDP encap socket */ | |
81 | struct hlist_head vni_list[VNI_HASH_SIZE]; | |
82 | }; | |
83 | ||
84 | /* Forwarding table entry */ | |
85 | struct vxlan_fdb { | |
86 | struct hlist_node hlist; /* linked list of entries */ | |
87 | struct rcu_head rcu; | |
88 | unsigned long updated; /* jiffies */ | |
89 | unsigned long used; | |
90 | __be32 remote_ip; | |
91 | u16 state; /* see ndm_state */ | |
92 | u8 eth_addr[ETH_ALEN]; | |
93 | }; | |
94 | ||
95 | /* Per-cpu network traffic stats */ | |
96 | struct vxlan_stats { | |
97 | u64 rx_packets; | |
98 | u64 rx_bytes; | |
99 | u64 tx_packets; | |
100 | u64 tx_bytes; | |
101 | struct u64_stats_sync syncp; | |
102 | }; | |
103 | ||
104 | /* Pseudo network device */ | |
105 | struct vxlan_dev { | |
106 | struct hlist_node hlist; | |
107 | struct net_device *dev; | |
108 | struct vxlan_stats __percpu *stats; | |
109 | __u32 vni; /* virtual network id */ | |
110 | __be32 gaddr; /* multicast group */ | |
111 | __be32 saddr; /* source address */ | |
112 | unsigned int link; /* link to multicast over */ | |
05f47d69 | 113 | __u16 port_min; /* source port range */ |
114 | __u16 port_max; | |
d342894c | 115 | __u8 tos; /* TOS override */ |
116 | __u8 ttl; | |
e4f67add | 117 | u32 flags; /* VXLAN_F_* below */ |
d342894c | 118 | |
119 | unsigned long age_interval; | |
120 | struct timer_list age_timer; | |
121 | spinlock_t hash_lock; | |
122 | unsigned int addrcnt; | |
123 | unsigned int addrmax; | |
d342894c | 124 | |
125 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
126 | }; | |
127 | ||
e4f67add DS |
128 | #define VXLAN_F_LEARN 0x01 |
129 | #define VXLAN_F_PROXY 0x02 | |
130 | #define VXLAN_F_RSC 0x04 | |
131 | #define VXLAN_F_L2MISS 0x08 | |
132 | #define VXLAN_F_L3MISS 0x10 | |
133 | ||
d342894c | 134 | /* salt for hash table */ |
135 | static u32 vxlan_salt __read_mostly; | |
136 | ||
137 | static inline struct hlist_head *vni_head(struct net *net, u32 id) | |
138 | { | |
139 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
140 | ||
141 | return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
142 | } | |
143 | ||
144 | /* Look up VNI in a per net namespace table */ | |
145 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) | |
146 | { | |
147 | struct vxlan_dev *vxlan; | |
d342894c | 148 | |
b67bfe0d | 149 | hlist_for_each_entry_rcu(vxlan, vni_head(net, id), hlist) { |
d342894c | 150 | if (vxlan->vni == id) |
151 | return vxlan; | |
152 | } | |
153 | ||
154 | return NULL; | |
155 | } | |
156 | ||
157 | /* Fill in neighbour message in skbuff. */ | |
158 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
159 | const struct vxlan_fdb *fdb, | |
160 | u32 portid, u32 seq, int type, unsigned int flags) | |
161 | { | |
162 | unsigned long now = jiffies; | |
163 | struct nda_cacheinfo ci; | |
164 | struct nlmsghdr *nlh; | |
165 | struct ndmsg *ndm; | |
e4f67add | 166 | bool send_ip, send_eth; |
d342894c | 167 | |
168 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
169 | if (nlh == NULL) | |
170 | return -EMSGSIZE; | |
171 | ||
172 | ndm = nlmsg_data(nlh); | |
173 | memset(ndm, 0, sizeof(*ndm)); | |
e4f67add DS |
174 | |
175 | send_eth = send_ip = true; | |
176 | ||
177 | if (type == RTM_GETNEIGH) { | |
178 | ndm->ndm_family = AF_INET; | |
179 | send_ip = fdb->remote_ip != 0; | |
180 | send_eth = !is_zero_ether_addr(fdb->eth_addr); | |
181 | } else | |
182 | ndm->ndm_family = AF_BRIDGE; | |
d342894c | 183 | ndm->ndm_state = fdb->state; |
184 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
185 | ndm->ndm_flags = NTF_SELF; | |
186 | ndm->ndm_type = NDA_DST; | |
187 | ||
e4f67add | 188 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
d342894c | 189 | goto nla_put_failure; |
190 | ||
e4f67add | 191 | if (send_ip && nla_put_be32(skb, NDA_DST, fdb->remote_ip)) |
d342894c | 192 | goto nla_put_failure; |
193 | ||
194 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
195 | ci.ndm_confirmed = 0; | |
196 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
197 | ci.ndm_refcnt = 0; | |
198 | ||
199 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
200 | goto nla_put_failure; | |
201 | ||
202 | return nlmsg_end(skb, nlh); | |
203 | ||
204 | nla_put_failure: | |
205 | nlmsg_cancel(skb, nlh); | |
206 | return -EMSGSIZE; | |
207 | } | |
208 | ||
209 | static inline size_t vxlan_nlmsg_size(void) | |
210 | { | |
211 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
212 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
213 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
214 | + nla_total_size(sizeof(struct nda_cacheinfo)); | |
215 | } | |
216 | ||
217 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
218 | const struct vxlan_fdb *fdb, int type) | |
219 | { | |
220 | struct net *net = dev_net(vxlan->dev); | |
221 | struct sk_buff *skb; | |
222 | int err = -ENOBUFS; | |
223 | ||
224 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
225 | if (skb == NULL) | |
226 | goto errout; | |
227 | ||
228 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0); | |
229 | if (err < 0) { | |
230 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
231 | WARN_ON(err == -EMSGSIZE); | |
232 | kfree_skb(skb); | |
233 | goto errout; | |
234 | } | |
235 | ||
236 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
237 | return; | |
238 | errout: | |
239 | if (err < 0) | |
240 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
241 | } | |
242 | ||
e4f67add DS |
243 | static void vxlan_ip_miss(struct net_device *dev, __be32 ipa) |
244 | { | |
245 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
246 | struct vxlan_fdb f; | |
247 | ||
248 | memset(&f, 0, sizeof f); | |
249 | f.state = NUD_STALE; | |
250 | f.remote_ip = ipa; /* goes to NDA_DST */ | |
251 | ||
252 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
253 | } | |
254 | ||
255 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
256 | { | |
257 | struct vxlan_fdb f; | |
258 | ||
259 | memset(&f, 0, sizeof f); | |
260 | f.state = NUD_STALE; | |
261 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); | |
262 | ||
263 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
264 | } | |
265 | ||
d342894c | 266 | /* Hash Ethernet address */ |
267 | static u32 eth_hash(const unsigned char *addr) | |
268 | { | |
269 | u64 value = get_unaligned((u64 *)addr); | |
270 | ||
271 | /* only want 6 bytes */ | |
272 | #ifdef __BIG_ENDIAN | |
d342894c | 273 | value >>= 16; |
321fb991 | 274 | #else |
275 | value <<= 16; | |
d342894c | 276 | #endif |
277 | return hash_64(value, FDB_HASH_BITS); | |
278 | } | |
279 | ||
280 | /* Hash chain to use given mac address */ | |
281 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
282 | const u8 *mac) | |
283 | { | |
284 | return &vxlan->fdb_head[eth_hash(mac)]; | |
285 | } | |
286 | ||
287 | /* Look up Ethernet address in forwarding table */ | |
288 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, | |
289 | const u8 *mac) | |
290 | ||
291 | { | |
292 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
293 | struct vxlan_fdb *f; | |
d342894c | 294 | |
b67bfe0d | 295 | hlist_for_each_entry_rcu(f, head, hlist) { |
d342894c | 296 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
297 | return f; | |
298 | } | |
299 | ||
300 | return NULL; | |
301 | } | |
302 | ||
303 | /* Add new entry to forwarding table -- assumes lock held */ | |
304 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
305 | const u8 *mac, __be32 ip, | |
306 | __u16 state, __u16 flags) | |
307 | { | |
308 | struct vxlan_fdb *f; | |
309 | int notify = 0; | |
310 | ||
311 | f = vxlan_find_mac(vxlan, mac); | |
312 | if (f) { | |
313 | if (flags & NLM_F_EXCL) { | |
314 | netdev_dbg(vxlan->dev, | |
315 | "lost race to create %pM\n", mac); | |
316 | return -EEXIST; | |
317 | } | |
318 | if (f->state != state) { | |
319 | f->state = state; | |
320 | f->updated = jiffies; | |
321 | notify = 1; | |
322 | } | |
323 | } else { | |
324 | if (!(flags & NLM_F_CREATE)) | |
325 | return -ENOENT; | |
326 | ||
327 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
328 | return -ENOSPC; | |
329 | ||
330 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
331 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
332 | if (!f) | |
333 | return -ENOMEM; | |
334 | ||
335 | notify = 1; | |
336 | f->remote_ip = ip; | |
337 | f->state = state; | |
338 | f->updated = f->used = jiffies; | |
339 | memcpy(f->eth_addr, mac, ETH_ALEN); | |
340 | ||
341 | ++vxlan->addrcnt; | |
342 | hlist_add_head_rcu(&f->hlist, | |
343 | vxlan_fdb_head(vxlan, mac)); | |
344 | } | |
345 | ||
346 | if (notify) | |
347 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) | |
353 | { | |
354 | netdev_dbg(vxlan->dev, | |
355 | "delete %pM\n", f->eth_addr); | |
356 | ||
357 | --vxlan->addrcnt; | |
358 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
359 | ||
360 | hlist_del_rcu(&f->hlist); | |
361 | kfree_rcu(f, rcu); | |
362 | } | |
363 | ||
364 | /* Add static entry (via netlink) */ | |
365 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
366 | struct net_device *dev, | |
367 | const unsigned char *addr, u16 flags) | |
368 | { | |
369 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
370 | __be32 ip; | |
371 | int err; | |
372 | ||
373 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
374 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
375 | ndm->ndm_state); | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | if (tb[NDA_DST] == NULL) | |
380 | return -EINVAL; | |
381 | ||
382 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
383 | return -EAFNOSUPPORT; | |
384 | ||
385 | ip = nla_get_be32(tb[NDA_DST]); | |
386 | ||
387 | spin_lock_bh(&vxlan->hash_lock); | |
388 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags); | |
389 | spin_unlock_bh(&vxlan->hash_lock); | |
390 | ||
391 | return err; | |
392 | } | |
393 | ||
394 | /* Delete entry (via netlink) */ | |
1690be63 VY |
395 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
396 | struct net_device *dev, | |
d342894c | 397 | const unsigned char *addr) |
398 | { | |
399 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
400 | struct vxlan_fdb *f; | |
401 | int err = -ENOENT; | |
402 | ||
403 | spin_lock_bh(&vxlan->hash_lock); | |
404 | f = vxlan_find_mac(vxlan, addr); | |
405 | if (f) { | |
406 | vxlan_fdb_destroy(vxlan, f); | |
407 | err = 0; | |
408 | } | |
409 | spin_unlock_bh(&vxlan->hash_lock); | |
410 | ||
411 | return err; | |
412 | } | |
413 | ||
414 | /* Dump forwarding table */ | |
415 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
416 | struct net_device *dev, int idx) | |
417 | { | |
418 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
419 | unsigned int h; | |
420 | ||
421 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
422 | struct vxlan_fdb *f; | |
d342894c | 423 | int err; |
424 | ||
b67bfe0d | 425 | hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
d342894c | 426 | if (idx < cb->args[0]) |
427 | goto skip; | |
428 | ||
429 | err = vxlan_fdb_info(skb, vxlan, f, | |
430 | NETLINK_CB(cb->skb).portid, | |
431 | cb->nlh->nlmsg_seq, | |
432 | RTM_NEWNEIGH, | |
433 | NLM_F_MULTI); | |
434 | if (err < 0) | |
435 | break; | |
436 | skip: | |
437 | ++idx; | |
438 | } | |
439 | } | |
440 | ||
441 | return idx; | |
442 | } | |
443 | ||
444 | /* Watch incoming packets to learn mapping between Ethernet address | |
445 | * and Tunnel endpoint. | |
446 | */ | |
447 | static void vxlan_snoop(struct net_device *dev, | |
448 | __be32 src_ip, const u8 *src_mac) | |
449 | { | |
450 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
451 | struct vxlan_fdb *f; | |
452 | int err; | |
453 | ||
454 | f = vxlan_find_mac(vxlan, src_mac); | |
455 | if (likely(f)) { | |
456 | f->used = jiffies; | |
457 | if (likely(f->remote_ip == src_ip)) | |
458 | return; | |
459 | ||
460 | if (net_ratelimit()) | |
461 | netdev_info(dev, | |
462 | "%pM migrated from %pI4 to %pI4\n", | |
463 | src_mac, &f->remote_ip, &src_ip); | |
464 | ||
465 | f->remote_ip = src_ip; | |
466 | f->updated = jiffies; | |
467 | } else { | |
468 | /* learned new entry */ | |
469 | spin_lock(&vxlan->hash_lock); | |
470 | err = vxlan_fdb_create(vxlan, src_mac, src_ip, | |
471 | NUD_REACHABLE, | |
472 | NLM_F_EXCL|NLM_F_CREATE); | |
473 | spin_unlock(&vxlan->hash_lock); | |
474 | } | |
475 | } | |
476 | ||
477 | ||
478 | /* See if multicast group is already in use by other ID */ | |
479 | static bool vxlan_group_used(struct vxlan_net *vn, | |
480 | const struct vxlan_dev *this) | |
481 | { | |
482 | const struct vxlan_dev *vxlan; | |
d342894c | 483 | unsigned h; |
484 | ||
485 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
b67bfe0d | 486 | hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) { |
d342894c | 487 | if (vxlan == this) |
488 | continue; | |
489 | ||
490 | if (!netif_running(vxlan->dev)) | |
491 | continue; | |
492 | ||
493 | if (vxlan->gaddr == this->gaddr) | |
494 | return true; | |
495 | } | |
496 | ||
497 | return false; | |
498 | } | |
499 | ||
500 | /* kernel equivalent to IP_ADD_MEMBERSHIP */ | |
501 | static int vxlan_join_group(struct net_device *dev) | |
502 | { | |
503 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
504 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
505 | struct sock *sk = vn->sock->sk; | |
506 | struct ip_mreqn mreq = { | |
af9b078e YB |
507 | .imr_multiaddr.s_addr = vxlan->gaddr, |
508 | .imr_ifindex = vxlan->link, | |
d342894c | 509 | }; |
510 | int err; | |
511 | ||
512 | /* Already a member of group */ | |
513 | if (vxlan_group_used(vn, vxlan)) | |
514 | return 0; | |
515 | ||
516 | /* Need to drop RTNL to call multicast join */ | |
517 | rtnl_unlock(); | |
518 | lock_sock(sk); | |
519 | err = ip_mc_join_group(sk, &mreq); | |
520 | release_sock(sk); | |
521 | rtnl_lock(); | |
522 | ||
523 | return err; | |
524 | } | |
525 | ||
526 | ||
527 | /* kernel equivalent to IP_DROP_MEMBERSHIP */ | |
528 | static int vxlan_leave_group(struct net_device *dev) | |
529 | { | |
530 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
531 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
532 | int err = 0; | |
533 | struct sock *sk = vn->sock->sk; | |
534 | struct ip_mreqn mreq = { | |
af9b078e YB |
535 | .imr_multiaddr.s_addr = vxlan->gaddr, |
536 | .imr_ifindex = vxlan->link, | |
d342894c | 537 | }; |
538 | ||
539 | /* Only leave group when last vxlan is done. */ | |
540 | if (vxlan_group_used(vn, vxlan)) | |
541 | return 0; | |
542 | ||
543 | /* Need to drop RTNL to call multicast leave */ | |
544 | rtnl_unlock(); | |
545 | lock_sock(sk); | |
546 | err = ip_mc_leave_group(sk, &mreq); | |
547 | release_sock(sk); | |
548 | rtnl_lock(); | |
549 | ||
550 | return err; | |
551 | } | |
552 | ||
553 | /* Callback from net/ipv4/udp.c to receive packets */ | |
554 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
555 | { | |
556 | struct iphdr *oip; | |
557 | struct vxlanhdr *vxh; | |
558 | struct vxlan_dev *vxlan; | |
559 | struct vxlan_stats *stats; | |
560 | __u32 vni; | |
561 | int err; | |
562 | ||
563 | /* pop off outer UDP header */ | |
564 | __skb_pull(skb, sizeof(struct udphdr)); | |
565 | ||
566 | /* Need Vxlan and inner Ethernet header to be present */ | |
567 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
568 | goto error; | |
569 | ||
570 | /* Drop packets with reserved bits set */ | |
571 | vxh = (struct vxlanhdr *) skb->data; | |
572 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
573 | (vxh->vx_vni & htonl(0xff))) { | |
574 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
575 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
576 | goto error; | |
577 | } | |
578 | ||
579 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 580 | |
581 | /* Is this VNI defined? */ | |
582 | vni = ntohl(vxh->vx_vni) >> 8; | |
583 | vxlan = vxlan_find_vni(sock_net(sk), vni); | |
584 | if (!vxlan) { | |
585 | netdev_dbg(skb->dev, "unknown vni %d\n", vni); | |
586 | goto drop; | |
587 | } | |
588 | ||
589 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
590 | vxlan->dev->stats.rx_length_errors++; | |
591 | vxlan->dev->stats.rx_errors++; | |
592 | goto drop; | |
593 | } | |
594 | ||
e4f67add DS |
595 | skb_reset_mac_header(skb); |
596 | ||
d342894c | 597 | /* Re-examine inner Ethernet packet */ |
598 | oip = ip_hdr(skb); | |
599 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 600 | |
601 | /* Ignore packet loops (and multicast echo) */ | |
602 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
603 | vxlan->dev->dev_addr) == 0) | |
604 | goto drop; | |
605 | ||
e4f67add | 606 | if (vxlan->flags & VXLAN_F_LEARN) |
d342894c | 607 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source); |
608 | ||
609 | __skb_tunnel_rx(skb, vxlan->dev); | |
610 | skb_reset_network_header(skb); | |
0afb1666 JG |
611 | |
612 | /* If the NIC driver gave us an encapsulated packet with | |
613 | * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, | |
614 | * leave the CHECKSUM_UNNECESSARY, the device checksummed it | |
615 | * for us. Otherwise force the upper layers to verify it. | |
616 | */ | |
617 | if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || | |
618 | !(vxlan->dev->features & NETIF_F_RXCSUM)) | |
619 | skb->ip_summed = CHECKSUM_NONE; | |
620 | ||
621 | skb->encapsulation = 0; | |
d342894c | 622 | |
623 | err = IP_ECN_decapsulate(oip, skb); | |
624 | if (unlikely(err)) { | |
625 | if (log_ecn_error) | |
626 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
627 | &oip->saddr, oip->tos); | |
628 | if (err > 1) { | |
629 | ++vxlan->dev->stats.rx_frame_errors; | |
630 | ++vxlan->dev->stats.rx_errors; | |
631 | goto drop; | |
632 | } | |
633 | } | |
634 | ||
635 | stats = this_cpu_ptr(vxlan->stats); | |
636 | u64_stats_update_begin(&stats->syncp); | |
637 | stats->rx_packets++; | |
638 | stats->rx_bytes += skb->len; | |
639 | u64_stats_update_end(&stats->syncp); | |
640 | ||
641 | netif_rx(skb); | |
642 | ||
643 | return 0; | |
644 | error: | |
645 | /* Put UDP header back */ | |
646 | __skb_push(skb, sizeof(struct udphdr)); | |
647 | ||
648 | return 1; | |
649 | drop: | |
650 | /* Consume bad packet */ | |
651 | kfree_skb(skb); | |
652 | return 0; | |
653 | } | |
654 | ||
e4f67add DS |
655 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
656 | { | |
657 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
658 | struct arphdr *parp; | |
659 | u8 *arpptr, *sha; | |
660 | __be32 sip, tip; | |
661 | struct neighbour *n; | |
662 | ||
663 | if (dev->flags & IFF_NOARP) | |
664 | goto out; | |
665 | ||
666 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
667 | dev->stats.tx_dropped++; | |
668 | goto out; | |
669 | } | |
670 | parp = arp_hdr(skb); | |
671 | ||
672 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
673 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
674 | parp->ar_pro != htons(ETH_P_IP) || | |
675 | parp->ar_op != htons(ARPOP_REQUEST) || | |
676 | parp->ar_hln != dev->addr_len || | |
677 | parp->ar_pln != 4) | |
678 | goto out; | |
679 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
680 | sha = arpptr; | |
681 | arpptr += dev->addr_len; /* sha */ | |
682 | memcpy(&sip, arpptr, sizeof(sip)); | |
683 | arpptr += sizeof(sip); | |
684 | arpptr += dev->addr_len; /* tha */ | |
685 | memcpy(&tip, arpptr, sizeof(tip)); | |
686 | ||
687 | if (ipv4_is_loopback(tip) || | |
688 | ipv4_is_multicast(tip)) | |
689 | goto out; | |
690 | ||
691 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
692 | ||
693 | if (n) { | |
694 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
695 | struct vxlan_fdb *f; | |
696 | struct sk_buff *reply; | |
697 | ||
698 | if (!(n->nud_state & NUD_CONNECTED)) { | |
699 | neigh_release(n); | |
700 | goto out; | |
701 | } | |
702 | ||
703 | f = vxlan_find_mac(vxlan, n->ha); | |
704 | if (f && f->remote_ip == 0) { | |
705 | /* bridge-local neighbor */ | |
706 | neigh_release(n); | |
707 | goto out; | |
708 | } | |
709 | ||
710 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
711 | n->ha, sha); | |
712 | ||
713 | neigh_release(n); | |
714 | ||
715 | skb_reset_mac_header(reply); | |
716 | __skb_pull(reply, skb_network_offset(reply)); | |
717 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
718 | reply->pkt_type = PACKET_HOST; | |
719 | ||
720 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
721 | dev->stats.rx_dropped++; | |
722 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
723 | vxlan_ip_miss(dev, tip); | |
724 | out: | |
725 | consume_skb(skb); | |
726 | return NETDEV_TX_OK; | |
727 | } | |
728 | ||
729 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
730 | { | |
731 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
732 | struct neighbour *n; | |
733 | struct iphdr *pip; | |
734 | ||
735 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
736 | return false; | |
737 | ||
738 | n = NULL; | |
739 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
740 | case ETH_P_IP: | |
741 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
742 | return false; | |
743 | pip = ip_hdr(skb); | |
744 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
745 | break; | |
746 | default: | |
747 | return false; | |
748 | } | |
749 | ||
750 | if (n) { | |
751 | bool diff; | |
752 | ||
753 | diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; | |
754 | if (diff) { | |
755 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
756 | dev->addr_len); | |
757 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
758 | } | |
759 | neigh_release(n); | |
760 | return diff; | |
761 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
762 | vxlan_ip_miss(dev, pip->daddr); | |
763 | return false; | |
764 | } | |
765 | ||
d342894c | 766 | /* Extract dsfield from inner protocol */ |
767 | static inline u8 vxlan_get_dsfield(const struct iphdr *iph, | |
768 | const struct sk_buff *skb) | |
769 | { | |
770 | if (skb->protocol == htons(ETH_P_IP)) | |
771 | return iph->tos; | |
772 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
773 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
774 | else | |
775 | return 0; | |
776 | } | |
777 | ||
778 | /* Propogate ECN bits out */ | |
779 | static inline u8 vxlan_ecn_encap(u8 tos, | |
780 | const struct iphdr *iph, | |
781 | const struct sk_buff *skb) | |
782 | { | |
783 | u8 inner = vxlan_get_dsfield(iph, skb); | |
784 | ||
785 | return INET_ECN_encapsulate(tos, inner); | |
786 | } | |
787 | ||
1cad8715 | 788 | static void vxlan_sock_free(struct sk_buff *skb) |
789 | { | |
790 | sock_put(skb->sk); | |
791 | } | |
792 | ||
793 | /* On transmit, associate with the tunnel socket */ | |
794 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
795 | { | |
796 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
797 | struct sock *sk = vn->sock->sk; | |
798 | ||
799 | skb_orphan(skb); | |
800 | sock_hold(sk); | |
801 | skb->sk = sk; | |
802 | skb->destructor = vxlan_sock_free; | |
803 | } | |
804 | ||
05f47d69 | 805 | /* Compute source port for outgoing packet |
806 | * first choice to use L4 flow hash since it will spread | |
807 | * better and maybe available from hardware | |
808 | * secondary choice is to use jhash on the Ethernet header | |
809 | */ | |
810 | static u16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) | |
811 | { | |
812 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
813 | u32 hash; | |
814 | ||
815 | hash = skb_get_rxhash(skb); | |
816 | if (!hash) | |
817 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
818 | (__force u32) skb->protocol); | |
819 | ||
820 | return (((u64) hash * range) >> 32) + vxlan->port_min; | |
821 | } | |
822 | ||
05c0db08 PS |
823 | static int handle_offloads(struct sk_buff *skb) |
824 | { | |
825 | if (skb_is_gso(skb)) { | |
826 | int err = skb_unclone(skb, GFP_ATOMIC); | |
827 | if (unlikely(err)) | |
828 | return err; | |
829 | ||
830 | skb_shinfo(skb)->gso_type |= (SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP); | |
831 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) | |
832 | skb->ip_summed = CHECKSUM_NONE; | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
d342894c | 837 | /* Transmit local packets over Vxlan |
838 | * | |
839 | * Outer IP header inherits ECN and DF from inner header. | |
840 | * Outer UDP destination is the VXLAN assigned port. | |
05f47d69 | 841 | * source port is based on hash of flow |
d342894c | 842 | */ |
843 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
844 | { | |
845 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
846 | struct rtable *rt; | |
d342894c | 847 | const struct iphdr *old_iph; |
e4f67add | 848 | struct ethhdr *eth; |
d342894c | 849 | struct iphdr *iph; |
850 | struct vxlanhdr *vxh; | |
851 | struct udphdr *uh; | |
852 | struct flowi4 fl4; | |
d342894c | 853 | unsigned int pkt_len = skb->len; |
d342894c | 854 | __be32 dst; |
05f47d69 | 855 | __u16 src_port; |
d342894c | 856 | __be16 df = 0; |
857 | __u8 tos, ttl; | |
858 | int err; | |
e4f67add DS |
859 | bool did_rsc = false; |
860 | const struct vxlan_fdb *f; | |
861 | ||
862 | skb_reset_mac_header(skb); | |
863 | eth = eth_hdr(skb); | |
864 | ||
865 | if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) | |
866 | return arp_reduce(dev, skb); | |
867 | else if ((vxlan->flags&VXLAN_F_RSC) && ntohs(eth->h_proto) == ETH_P_IP) | |
868 | did_rsc = route_shortcircuit(dev, skb); | |
d342894c | 869 | |
e4f67add DS |
870 | f = vxlan_find_mac(vxlan, eth->h_dest); |
871 | if (f == NULL) { | |
872 | did_rsc = false; | |
873 | dst = vxlan->gaddr; | |
874 | if (!dst && (vxlan->flags & VXLAN_F_L2MISS) && | |
875 | !is_multicast_ether_addr(eth->h_dest)) | |
876 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
877 | } else | |
878 | dst = f->remote_ip; | |
879 | ||
880 | if (!dst) { | |
881 | if (did_rsc) { | |
882 | __skb_pull(skb, skb_network_offset(skb)); | |
883 | skb->ip_summed = CHECKSUM_NONE; | |
884 | skb->pkt_type = PACKET_HOST; | |
885 | ||
886 | /* short-circuited back to local bridge */ | |
887 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
888 | struct vxlan_stats *stats = | |
889 | this_cpu_ptr(vxlan->stats); | |
890 | ||
891 | u64_stats_update_begin(&stats->syncp); | |
892 | stats->tx_packets++; | |
893 | stats->tx_bytes += pkt_len; | |
894 | u64_stats_update_end(&stats->syncp); | |
895 | } else { | |
896 | dev->stats.tx_errors++; | |
897 | dev->stats.tx_aborted_errors++; | |
898 | } | |
899 | return NETDEV_TX_OK; | |
900 | } | |
ef59febe | 901 | goto drop; |
e4f67add | 902 | } |
ef59febe | 903 | |
d6727fe3 JG |
904 | if (!skb->encapsulation) { |
905 | skb_reset_inner_headers(skb); | |
906 | skb->encapsulation = 1; | |
907 | } | |
908 | ||
d342894c | 909 | /* Need space for new headers (invalidates iph ptr) */ |
910 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
911 | goto drop; | |
912 | ||
d342894c | 913 | old_iph = ip_hdr(skb); |
914 | ||
d342894c | 915 | ttl = vxlan->ttl; |
916 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
917 | ttl = 1; | |
918 | ||
919 | tos = vxlan->tos; | |
920 | if (tos == 1) | |
921 | tos = vxlan_get_dsfield(old_iph, skb); | |
922 | ||
05f47d69 | 923 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 924 | |
ca78f181 | 925 | memset(&fl4, 0, sizeof(fl4)); |
926 | fl4.flowi4_oif = vxlan->link; | |
927 | fl4.flowi4_tos = RT_TOS(tos); | |
928 | fl4.daddr = dst; | |
929 | fl4.saddr = vxlan->saddr; | |
930 | ||
931 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 932 | if (IS_ERR(rt)) { |
933 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
934 | dev->stats.tx_carrier_errors++; | |
935 | goto tx_error; | |
936 | } | |
937 | ||
938 | if (rt->dst.dev == dev) { | |
939 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
940 | ip_rt_put(rt); | |
941 | dev->stats.collisions++; | |
942 | goto tx_error; | |
943 | } | |
944 | ||
945 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
946 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
947 | IPSKB_REROUTED); | |
948 | skb_dst_drop(skb); | |
949 | skb_dst_set(skb, &rt->dst); | |
950 | ||
951 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); | |
952 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
953 | vxh->vx_vni = htonl(vxlan->vni << 8); | |
954 | ||
955 | __skb_push(skb, sizeof(*uh)); | |
956 | skb_reset_transport_header(skb); | |
957 | uh = udp_hdr(skb); | |
958 | ||
959 | uh->dest = htons(vxlan_port); | |
05f47d69 | 960 | uh->source = htons(src_port); |
d342894c | 961 | |
962 | uh->len = htons(skb->len); | |
963 | uh->check = 0; | |
964 | ||
965 | __skb_push(skb, sizeof(*iph)); | |
966 | skb_reset_network_header(skb); | |
967 | iph = ip_hdr(skb); | |
968 | iph->version = 4; | |
969 | iph->ihl = sizeof(struct iphdr) >> 2; | |
970 | iph->frag_off = df; | |
971 | iph->protocol = IPPROTO_UDP; | |
972 | iph->tos = vxlan_ecn_encap(tos, old_iph, skb); | |
ca78f181 | 973 | iph->daddr = dst; |
d342894c | 974 | iph->saddr = fl4.saddr; |
975 | iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
8dc98eb2 | 976 | tunnel_ip_select_ident(skb, old_iph, &rt->dst); |
d342894c | 977 | |
1cad8715 | 978 | vxlan_set_owner(dev, skb); |
979 | ||
05c0db08 PS |
980 | if (handle_offloads(skb)) |
981 | goto drop; | |
d342894c | 982 | |
983 | err = ip_local_out(skb); | |
984 | if (likely(net_xmit_eval(err) == 0)) { | |
985 | struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats); | |
986 | ||
987 | u64_stats_update_begin(&stats->syncp); | |
988 | stats->tx_packets++; | |
989 | stats->tx_bytes += pkt_len; | |
990 | u64_stats_update_end(&stats->syncp); | |
991 | } else { | |
992 | dev->stats.tx_errors++; | |
993 | dev->stats.tx_aborted_errors++; | |
994 | } | |
995 | return NETDEV_TX_OK; | |
996 | ||
997 | drop: | |
998 | dev->stats.tx_dropped++; | |
999 | goto tx_free; | |
1000 | ||
1001 | tx_error: | |
1002 | dev->stats.tx_errors++; | |
1003 | tx_free: | |
1004 | dev_kfree_skb(skb); | |
1005 | return NETDEV_TX_OK; | |
1006 | } | |
1007 | ||
1008 | /* Walk the forwarding table and purge stale entries */ | |
1009 | static void vxlan_cleanup(unsigned long arg) | |
1010 | { | |
1011 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
1012 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
1013 | unsigned int h; | |
1014 | ||
1015 | if (!netif_running(vxlan->dev)) | |
1016 | return; | |
1017 | ||
1018 | spin_lock_bh(&vxlan->hash_lock); | |
1019 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1020 | struct hlist_node *p, *n; | |
1021 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1022 | struct vxlan_fdb *f | |
1023 | = container_of(p, struct vxlan_fdb, hlist); | |
1024 | unsigned long timeout; | |
1025 | ||
3c172868 | 1026 | if (f->state & NUD_PERMANENT) |
d342894c | 1027 | continue; |
1028 | ||
1029 | timeout = f->used + vxlan->age_interval * HZ; | |
1030 | if (time_before_eq(timeout, jiffies)) { | |
1031 | netdev_dbg(vxlan->dev, | |
1032 | "garbage collect %pM\n", | |
1033 | f->eth_addr); | |
1034 | f->state = NUD_STALE; | |
1035 | vxlan_fdb_destroy(vxlan, f); | |
1036 | } else if (time_before(timeout, next_timer)) | |
1037 | next_timer = timeout; | |
1038 | } | |
1039 | } | |
1040 | spin_unlock_bh(&vxlan->hash_lock); | |
1041 | ||
1042 | mod_timer(&vxlan->age_timer, next_timer); | |
1043 | } | |
1044 | ||
1045 | /* Setup stats when device is created */ | |
1046 | static int vxlan_init(struct net_device *dev) | |
1047 | { | |
1048 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1049 | ||
1050 | vxlan->stats = alloc_percpu(struct vxlan_stats); | |
1051 | if (!vxlan->stats) | |
1052 | return -ENOMEM; | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | /* Start ageing timer and join group when device is brought up */ | |
1058 | static int vxlan_open(struct net_device *dev) | |
1059 | { | |
1060 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1061 | int err; | |
1062 | ||
1063 | if (vxlan->gaddr) { | |
1064 | err = vxlan_join_group(dev); | |
1065 | if (err) | |
1066 | return err; | |
1067 | } | |
1068 | ||
1069 | if (vxlan->age_interval) | |
1070 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
1071 | ||
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | /* Purge the forwarding table */ | |
1076 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
1077 | { | |
1078 | unsigned h; | |
1079 | ||
1080 | spin_lock_bh(&vxlan->hash_lock); | |
1081 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1082 | struct hlist_node *p, *n; | |
1083 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1084 | struct vxlan_fdb *f | |
1085 | = container_of(p, struct vxlan_fdb, hlist); | |
1086 | vxlan_fdb_destroy(vxlan, f); | |
1087 | } | |
1088 | } | |
1089 | spin_unlock_bh(&vxlan->hash_lock); | |
1090 | } | |
1091 | ||
1092 | /* Cleanup timer and forwarding table on shutdown */ | |
1093 | static int vxlan_stop(struct net_device *dev) | |
1094 | { | |
1095 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1096 | ||
1097 | if (vxlan->gaddr) | |
1098 | vxlan_leave_group(dev); | |
1099 | ||
1100 | del_timer_sync(&vxlan->age_timer); | |
1101 | ||
1102 | vxlan_flush(vxlan); | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | /* Merge per-cpu statistics */ | |
1108 | static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev, | |
1109 | struct rtnl_link_stats64 *stats) | |
1110 | { | |
1111 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1112 | struct vxlan_stats tmp, sum = { 0 }; | |
1113 | unsigned int cpu; | |
1114 | ||
1115 | for_each_possible_cpu(cpu) { | |
1116 | unsigned int start; | |
1117 | const struct vxlan_stats *stats | |
1118 | = per_cpu_ptr(vxlan->stats, cpu); | |
1119 | ||
1120 | do { | |
1121 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
1122 | memcpy(&tmp, stats, sizeof(tmp)); | |
1123 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
1124 | ||
1125 | sum.tx_bytes += tmp.tx_bytes; | |
1126 | sum.tx_packets += tmp.tx_packets; | |
1127 | sum.rx_bytes += tmp.rx_bytes; | |
1128 | sum.rx_packets += tmp.rx_packets; | |
1129 | } | |
1130 | ||
1131 | stats->tx_bytes = sum.tx_bytes; | |
1132 | stats->tx_packets = sum.tx_packets; | |
1133 | stats->rx_bytes = sum.rx_bytes; | |
1134 | stats->rx_packets = sum.rx_packets; | |
1135 | ||
1136 | stats->multicast = dev->stats.multicast; | |
1137 | stats->rx_length_errors = dev->stats.rx_length_errors; | |
1138 | stats->rx_frame_errors = dev->stats.rx_frame_errors; | |
1139 | stats->rx_errors = dev->stats.rx_errors; | |
1140 | ||
1141 | stats->tx_dropped = dev->stats.tx_dropped; | |
1142 | stats->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
1143 | stats->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
1144 | stats->collisions = dev->stats.collisions; | |
1145 | stats->tx_errors = dev->stats.tx_errors; | |
1146 | ||
1147 | return stats; | |
1148 | } | |
1149 | ||
1150 | /* Stub, nothing needs to be done. */ | |
1151 | static void vxlan_set_multicast_list(struct net_device *dev) | |
1152 | { | |
1153 | } | |
1154 | ||
1155 | static const struct net_device_ops vxlan_netdev_ops = { | |
1156 | .ndo_init = vxlan_init, | |
1157 | .ndo_open = vxlan_open, | |
1158 | .ndo_stop = vxlan_stop, | |
1159 | .ndo_start_xmit = vxlan_xmit, | |
1160 | .ndo_get_stats64 = vxlan_stats64, | |
1161 | .ndo_set_rx_mode = vxlan_set_multicast_list, | |
1162 | .ndo_change_mtu = eth_change_mtu, | |
1163 | .ndo_validate_addr = eth_validate_addr, | |
1164 | .ndo_set_mac_address = eth_mac_addr, | |
1165 | .ndo_fdb_add = vxlan_fdb_add, | |
1166 | .ndo_fdb_del = vxlan_fdb_delete, | |
1167 | .ndo_fdb_dump = vxlan_fdb_dump, | |
1168 | }; | |
1169 | ||
1170 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1171 | static struct device_type vxlan_type = { | |
1172 | .name = "vxlan", | |
1173 | }; | |
1174 | ||
1175 | static void vxlan_free(struct net_device *dev) | |
1176 | { | |
1177 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1178 | ||
1179 | free_percpu(vxlan->stats); | |
1180 | free_netdev(dev); | |
1181 | } | |
1182 | ||
1183 | /* Initialize the device structure. */ | |
1184 | static void vxlan_setup(struct net_device *dev) | |
1185 | { | |
1186 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1187 | unsigned h; | |
05f47d69 | 1188 | int low, high; |
d342894c | 1189 | |
1190 | eth_hw_addr_random(dev); | |
1191 | ether_setup(dev); | |
2840bf22 | 1192 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 1193 | |
1194 | dev->netdev_ops = &vxlan_netdev_ops; | |
1195 | dev->destructor = vxlan_free; | |
1196 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); | |
1197 | ||
1198 | dev->tx_queue_len = 0; | |
1199 | dev->features |= NETIF_F_LLTX; | |
1200 | dev->features |= NETIF_F_NETNS_LOCAL; | |
d6727fe3 | 1201 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
0afb1666 | 1202 | dev->features |= NETIF_F_RXCSUM; |
05c0db08 | 1203 | dev->features |= NETIF_F_GSO_SOFTWARE; |
0afb1666 JG |
1204 | |
1205 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
05c0db08 | 1206 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
d342894c | 1207 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
6602d007 | 1208 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d342894c | 1209 | |
1210 | spin_lock_init(&vxlan->hash_lock); | |
1211 | ||
1212 | init_timer_deferrable(&vxlan->age_timer); | |
1213 | vxlan->age_timer.function = vxlan_cleanup; | |
1214 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1215 | ||
05f47d69 | 1216 | inet_get_local_port_range(&low, &high); |
1217 | vxlan->port_min = low; | |
1218 | vxlan->port_max = high; | |
1219 | ||
d342894c | 1220 | vxlan->dev = dev; |
1221 | ||
1222 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1223 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1224 | } | |
1225 | ||
1226 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1227 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
1228 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
1229 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, | |
1230 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1231 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1232 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1233 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1234 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1235 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1236 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
e4f67add DS |
1237 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
1238 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
1239 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
1240 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
d342894c | 1241 | }; |
1242 | ||
1243 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1244 | { | |
1245 | if (tb[IFLA_ADDRESS]) { | |
1246 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1247 | pr_debug("invalid link address (not ethernet)\n"); | |
1248 | return -EINVAL; | |
1249 | } | |
1250 | ||
1251 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1252 | pr_debug("invalid all zero ethernet address\n"); | |
1253 | return -EADDRNOTAVAIL; | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | if (!data) | |
1258 | return -EINVAL; | |
1259 | ||
1260 | if (data[IFLA_VXLAN_ID]) { | |
1261 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1262 | if (id >= VXLAN_VID_MASK) | |
1263 | return -ERANGE; | |
1264 | } | |
1265 | ||
1266 | if (data[IFLA_VXLAN_GROUP]) { | |
1267 | __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1268 | if (!IN_MULTICAST(ntohl(gaddr))) { | |
1269 | pr_debug("group address is not IPv4 multicast\n"); | |
1270 | return -EADDRNOTAVAIL; | |
1271 | } | |
1272 | } | |
05f47d69 | 1273 | |
1274 | if (data[IFLA_VXLAN_PORT_RANGE]) { | |
1275 | const struct ifla_vxlan_port_range *p | |
1276 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1277 | ||
1278 | if (ntohs(p->high) < ntohs(p->low)) { | |
1279 | pr_debug("port range %u .. %u not valid\n", | |
1280 | ntohs(p->low), ntohs(p->high)); | |
1281 | return -EINVAL; | |
1282 | } | |
1283 | } | |
1284 | ||
d342894c | 1285 | return 0; |
1286 | } | |
1287 | ||
1b13c97f YB |
1288 | static void vxlan_get_drvinfo(struct net_device *netdev, |
1289 | struct ethtool_drvinfo *drvinfo) | |
1290 | { | |
1291 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
1292 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
1293 | } | |
1294 | ||
1295 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
1296 | .get_drvinfo = vxlan_get_drvinfo, | |
1297 | .get_link = ethtool_op_get_link, | |
1298 | }; | |
1299 | ||
d342894c | 1300 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1301 | struct nlattr *tb[], struct nlattr *data[]) | |
1302 | { | |
1303 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1304 | __u32 vni; | |
1305 | int err; | |
1306 | ||
1307 | if (!data[IFLA_VXLAN_ID]) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1311 | if (vxlan_find_vni(net, vni)) { | |
1312 | pr_info("duplicate VNI %u\n", vni); | |
1313 | return -EEXIST; | |
1314 | } | |
1315 | vxlan->vni = vni; | |
1316 | ||
1317 | if (data[IFLA_VXLAN_GROUP]) | |
1318 | vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1319 | ||
1320 | if (data[IFLA_VXLAN_LOCAL]) | |
1321 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1322 | ||
34e02aa1 | 1323 | if (data[IFLA_VXLAN_LINK] && |
1324 | (vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]))) { | |
1325 | struct net_device *lowerdev | |
1326 | = __dev_get_by_index(net, vxlan->link); | |
1327 | ||
1328 | if (!lowerdev) { | |
1329 | pr_info("ifindex %d does not exist\n", vxlan->link); | |
1330 | return -ENODEV; | |
1331 | } | |
d342894c | 1332 | |
34e02aa1 | 1333 | if (!tb[IFLA_MTU]) |
d342894c | 1334 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1ba56fb4 AD |
1335 | |
1336 | /* update header length based on lower device */ | |
1337 | dev->hard_header_len = lowerdev->hard_header_len + | |
1338 | VXLAN_HEADROOM; | |
d342894c | 1339 | } |
1340 | ||
1341 | if (data[IFLA_VXLAN_TOS]) | |
1342 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1343 | ||
afb97186 VB |
1344 | if (data[IFLA_VXLAN_TTL]) |
1345 | vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
1346 | ||
d342894c | 1347 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
e4f67add | 1348 | vxlan->flags |= VXLAN_F_LEARN; |
d342894c | 1349 | |
1350 | if (data[IFLA_VXLAN_AGEING]) | |
1351 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1352 | else | |
1353 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1354 | ||
e4f67add DS |
1355 | if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) |
1356 | vxlan->flags |= VXLAN_F_PROXY; | |
1357 | ||
1358 | if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) | |
1359 | vxlan->flags |= VXLAN_F_RSC; | |
1360 | ||
1361 | if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) | |
1362 | vxlan->flags |= VXLAN_F_L2MISS; | |
1363 | ||
1364 | if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) | |
1365 | vxlan->flags |= VXLAN_F_L3MISS; | |
1366 | ||
d342894c | 1367 | if (data[IFLA_VXLAN_LIMIT]) |
1368 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1369 | ||
05f47d69 | 1370 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1371 | const struct ifla_vxlan_port_range *p | |
1372 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1373 | vxlan->port_min = ntohs(p->low); | |
1374 | vxlan->port_max = ntohs(p->high); | |
1375 | } | |
1376 | ||
1b13c97f YB |
1377 | SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); |
1378 | ||
d342894c | 1379 | err = register_netdevice(dev); |
1380 | if (!err) | |
1381 | hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni)); | |
1382 | ||
1383 | return err; | |
1384 | } | |
1385 | ||
1386 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1387 | { | |
1388 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1389 | ||
1390 | hlist_del_rcu(&vxlan->hlist); | |
1391 | ||
1392 | unregister_netdevice_queue(dev, head); | |
1393 | } | |
1394 | ||
1395 | static size_t vxlan_get_size(const struct net_device *dev) | |
1396 | { | |
1397 | ||
1398 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
1399 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ | |
1400 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ | |
1401 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1402 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1403 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1404 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
e4f67add DS |
1405 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ |
1406 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
1407 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
1408 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
d342894c | 1409 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1410 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1411 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
d342894c | 1412 | 0; |
1413 | } | |
1414 | ||
1415 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1416 | { | |
1417 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
05f47d69 | 1418 | struct ifla_vxlan_port_range ports = { |
1419 | .low = htons(vxlan->port_min), | |
1420 | .high = htons(vxlan->port_max), | |
1421 | }; | |
d342894c | 1422 | |
1423 | if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni)) | |
1424 | goto nla_put_failure; | |
1425 | ||
7c41c42c | 1426 | if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr)) |
d342894c | 1427 | goto nla_put_failure; |
1428 | ||
1429 | if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link)) | |
1430 | goto nla_put_failure; | |
1431 | ||
7c41c42c | 1432 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1433 | goto nla_put_failure; |
1434 | ||
1435 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1436 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
e4f67add DS |
1437 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, |
1438 | !!(vxlan->flags & VXLAN_F_LEARN)) || | |
1439 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
1440 | !!(vxlan->flags & VXLAN_F_PROXY)) || | |
1441 | nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || | |
1442 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
1443 | !!(vxlan->flags & VXLAN_F_L2MISS)) || | |
1444 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
1445 | !!(vxlan->flags & VXLAN_F_L3MISS)) || | |
d342894c | 1446 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
1447 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax)) | |
1448 | goto nla_put_failure; | |
1449 | ||
05f47d69 | 1450 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1451 | goto nla_put_failure; | |
1452 | ||
d342894c | 1453 | return 0; |
1454 | ||
1455 | nla_put_failure: | |
1456 | return -EMSGSIZE; | |
1457 | } | |
1458 | ||
1459 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1460 | .kind = "vxlan", | |
1461 | .maxtype = IFLA_VXLAN_MAX, | |
1462 | .policy = vxlan_policy, | |
1463 | .priv_size = sizeof(struct vxlan_dev), | |
1464 | .setup = vxlan_setup, | |
1465 | .validate = vxlan_validate, | |
1466 | .newlink = vxlan_newlink, | |
1467 | .dellink = vxlan_dellink, | |
1468 | .get_size = vxlan_get_size, | |
1469 | .fill_info = vxlan_fill_info, | |
1470 | }; | |
1471 | ||
1472 | static __net_init int vxlan_init_net(struct net *net) | |
1473 | { | |
1474 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1475 | struct sock *sk; | |
1476 | struct sockaddr_in vxlan_addr = { | |
1477 | .sin_family = AF_INET, | |
1478 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1479 | }; | |
1480 | int rc; | |
1481 | unsigned h; | |
1482 | ||
1483 | /* Create UDP socket for encapsulation receive. */ | |
1484 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); | |
1485 | if (rc < 0) { | |
1486 | pr_debug("UDP socket create failed\n"); | |
1487 | return rc; | |
1488 | } | |
bfe1b9b1 | 1489 | /* Put in proper namespace */ |
1490 | sk = vn->sock->sk; | |
1491 | sk_change_net(sk, net); | |
d342894c | 1492 | |
1493 | vxlan_addr.sin_port = htons(vxlan_port); | |
1494 | ||
1495 | rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr, | |
1496 | sizeof(vxlan_addr)); | |
1497 | if (rc < 0) { | |
1498 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1499 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
bfe1b9b1 | 1500 | sk_release_kernel(sk); |
d342894c | 1501 | vn->sock = NULL; |
1502 | return rc; | |
1503 | } | |
1504 | ||
1505 | /* Disable multicast loopback */ | |
d342894c | 1506 | inet_sk(sk)->mc_loop = 0; |
1507 | ||
1508 | /* Mark socket as an encapsulation socket. */ | |
1509 | udp_sk(sk)->encap_type = 1; | |
1510 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1511 | udp_encap_enable(); | |
1512 | ||
1513 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1514 | INIT_HLIST_HEAD(&vn->vni_list[h]); | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static __net_exit void vxlan_exit_net(struct net *net) | |
1520 | { | |
1521 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1522 | ||
1523 | if (vn->sock) { | |
bfe1b9b1 | 1524 | sk_release_kernel(vn->sock->sk); |
d342894c | 1525 | vn->sock = NULL; |
1526 | } | |
1527 | } | |
1528 | ||
1529 | static struct pernet_operations vxlan_net_ops = { | |
1530 | .init = vxlan_init_net, | |
1531 | .exit = vxlan_exit_net, | |
1532 | .id = &vxlan_net_id, | |
1533 | .size = sizeof(struct vxlan_net), | |
1534 | }; | |
1535 | ||
1536 | static int __init vxlan_init_module(void) | |
1537 | { | |
1538 | int rc; | |
1539 | ||
1540 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); | |
1541 | ||
1542 | rc = register_pernet_device(&vxlan_net_ops); | |
1543 | if (rc) | |
1544 | goto out1; | |
1545 | ||
1546 | rc = rtnl_link_register(&vxlan_link_ops); | |
1547 | if (rc) | |
1548 | goto out2; | |
1549 | ||
1550 | return 0; | |
1551 | ||
1552 | out2: | |
1553 | unregister_pernet_device(&vxlan_net_ops); | |
1554 | out1: | |
1555 | return rc; | |
1556 | } | |
1557 | module_init(vxlan_init_module); | |
1558 | ||
1559 | static void __exit vxlan_cleanup_module(void) | |
1560 | { | |
1561 | rtnl_link_unregister(&vxlan_link_ops); | |
1562 | unregister_pernet_device(&vxlan_net_ops); | |
1563 | } | |
1564 | module_exit(vxlan_cleanup_module); | |
1565 | ||
1566 | MODULE_LICENSE("GPL"); | |
1567 | MODULE_VERSION(VXLAN_VERSION); | |
1568 | MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>"); | |
1569 | MODULE_ALIAS_RTNL_LINK("vxlan"); |