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Commit | Line | Data |
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d342894c | 1 | /* |
eb5ce439 | 2 | * VXLAN: Virtual eXtensible Local Area Network |
d342894c | 3 | * |
3b8df3c6 | 4 | * Copyright (c) 2012-2013 Vyatta Inc. |
d342894c | 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 | |
d342894c | 11 | * - IPv6 (not in RFC) |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/rculist.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/ip.h> | |
26 | #include <linux/udp.h> | |
27 | #include <linux/igmp.h> | |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/if_ether.h> | |
d342894c | 30 | #include <linux/hash.h> |
1b13c97f | 31 | #include <linux/ethtool.h> |
e4f67add DS |
32 | #include <net/arp.h> |
33 | #include <net/ndisc.h> | |
d342894c | 34 | #include <net/ip.h> |
c5441932 | 35 | #include <net/ip_tunnels.h> |
d342894c | 36 | #include <net/icmp.h> |
37 | #include <net/udp.h> | |
38 | #include <net/rtnetlink.h> | |
39 | #include <net/route.h> | |
40 | #include <net/dsfield.h> | |
41 | #include <net/inet_ecn.h> | |
42 | #include <net/net_namespace.h> | |
43 | #include <net/netns/generic.h> | |
44 | ||
45 | #define VXLAN_VERSION "0.1" | |
46 | ||
553675fb | 47 | #define PORT_HASH_BITS 8 |
48 | #define PORT_HASH_SIZE (1<<PORT_HASH_BITS) | |
d342894c | 49 | #define VNI_HASH_BITS 10 |
50 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
51 | #define FDB_HASH_BITS 8 | |
52 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) | |
53 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
54 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
55 | ||
56 | #define VXLAN_N_VID (1u << 24) | |
57 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
52b702ff AD |
58 | /* IP header + UDP + VXLAN + Ethernet header */ |
59 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
d342894c | 60 | |
61 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ | |
62 | ||
63 | /* VXLAN protocol header */ | |
64 | struct vxlanhdr { | |
65 | __be32 vx_flags; | |
66 | __be32 vx_vni; | |
67 | }; | |
68 | ||
23c578bf | 69 | /* UDP port for VXLAN traffic. |
70 | * The IANA assigned port is 4789, but the Linux default is 8472 | |
234f5b73 | 71 | * for compatibility with early adopters. |
23c578bf | 72 | */ |
9daaa397 SH |
73 | static unsigned short vxlan_port __read_mostly = 8472; |
74 | module_param_named(udp_port, vxlan_port, ushort, 0444); | |
d342894c | 75 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); |
76 | ||
77 | static bool log_ecn_error = true; | |
78 | module_param(log_ecn_error, bool, 0644); | |
79 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
80 | ||
60d9d4c6 | 81 | static int vxlan_net_id; |
553675fb | 82 | |
afbd8bae MR |
83 | static const u8 all_zeros_mac[ETH_ALEN]; |
84 | ||
553675fb | 85 | /* per UDP socket information */ |
86 | struct vxlan_sock { | |
87 | struct hlist_node hlist; | |
88 | struct rcu_head rcu; | |
89 | struct work_struct del_work; | |
7c47cedf | 90 | atomic_t refcnt; |
553675fb | 91 | struct socket *sock; |
d342894c | 92 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
93 | }; | |
94 | ||
553675fb | 95 | /* per-network namespace private data for this module */ |
96 | struct vxlan_net { | |
97 | struct list_head vxlan_list; | |
98 | struct hlist_head sock_list[PORT_HASH_SIZE]; | |
1c51a915 | 99 | spinlock_t sock_lock; |
553675fb | 100 | }; |
101 | ||
6681712d | 102 | struct vxlan_rdst { |
6681712d DS |
103 | __be32 remote_ip; |
104 | __be16 remote_port; | |
105 | u32 remote_vni; | |
106 | u32 remote_ifindex; | |
3e61aa8f | 107 | struct list_head list; |
6681712d DS |
108 | }; |
109 | ||
d342894c | 110 | /* Forwarding table entry */ |
111 | struct vxlan_fdb { | |
112 | struct hlist_node hlist; /* linked list of entries */ | |
113 | struct rcu_head rcu; | |
114 | unsigned long updated; /* jiffies */ | |
115 | unsigned long used; | |
3e61aa8f | 116 | struct list_head remotes; |
d342894c | 117 | u16 state; /* see ndm_state */ |
ae884082 | 118 | u8 flags; /* see ndm_flags */ |
d342894c | 119 | u8 eth_addr[ETH_ALEN]; |
120 | }; | |
121 | ||
d342894c | 122 | /* Pseudo network device */ |
123 | struct vxlan_dev { | |
553675fb | 124 | struct hlist_node hlist; /* vni hash table */ |
125 | struct list_head next; /* vxlan's per namespace list */ | |
126 | struct vxlan_sock *vn_sock; /* listening socket */ | |
d342894c | 127 | struct net_device *dev; |
c7995c43 | 128 | struct vxlan_rdst default_dst; /* default destination */ |
d342894c | 129 | __be32 saddr; /* source address */ |
823aa873 | 130 | __be16 dst_port; |
05f47d69 | 131 | __u16 port_min; /* source port range */ |
132 | __u16 port_max; | |
d342894c | 133 | __u8 tos; /* TOS override */ |
134 | __u8 ttl; | |
e4f67add | 135 | u32 flags; /* VXLAN_F_* below */ |
d342894c | 136 | |
1c51a915 | 137 | struct work_struct sock_work; |
7c47cedf | 138 | struct work_struct igmp_work; |
1c51a915 | 139 | |
d342894c | 140 | unsigned long age_interval; |
141 | struct timer_list age_timer; | |
142 | spinlock_t hash_lock; | |
143 | unsigned int addrcnt; | |
144 | unsigned int addrmax; | |
d342894c | 145 | |
146 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
147 | }; | |
148 | ||
e4f67add DS |
149 | #define VXLAN_F_LEARN 0x01 |
150 | #define VXLAN_F_PROXY 0x02 | |
151 | #define VXLAN_F_RSC 0x04 | |
152 | #define VXLAN_F_L2MISS 0x08 | |
153 | #define VXLAN_F_L3MISS 0x10 | |
154 | ||
d342894c | 155 | /* salt for hash table */ |
156 | static u32 vxlan_salt __read_mostly; | |
758c57d1 | 157 | static struct workqueue_struct *vxlan_wq; |
d342894c | 158 | |
1c51a915 SH |
159 | static void vxlan_sock_work(struct work_struct *work); |
160 | ||
553675fb | 161 | /* Virtual Network hash table head */ |
162 | static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id) | |
163 | { | |
164 | return &vs->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
165 | } | |
166 | ||
167 | /* Socket hash table head */ | |
168 | static inline struct hlist_head *vs_head(struct net *net, __be16 port) | |
d342894c | 169 | { |
170 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
171 | ||
553675fb | 172 | return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; |
173 | } | |
174 | ||
3e61aa8f SH |
175 | /* First remote destination for a forwarding entry. |
176 | * Guaranteed to be non-NULL because remotes are never deleted. | |
177 | */ | |
178 | static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb) | |
179 | { | |
180 | return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list); | |
181 | } | |
182 | ||
553675fb | 183 | /* Find VXLAN socket based on network namespace and UDP port */ |
184 | static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port) | |
185 | { | |
186 | struct vxlan_sock *vs; | |
187 | ||
188 | hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { | |
189 | if (inet_sk(vs->sock->sk)->inet_sport == port) | |
190 | return vs; | |
191 | } | |
192 | return NULL; | |
d342894c | 193 | } |
194 | ||
195 | /* Look up VNI in a per net namespace table */ | |
553675fb | 196 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port) |
d342894c | 197 | { |
553675fb | 198 | struct vxlan_sock *vs; |
d342894c | 199 | struct vxlan_dev *vxlan; |
d342894c | 200 | |
553675fb | 201 | vs = vxlan_find_port(net, port); |
202 | if (!vs) | |
203 | return NULL; | |
204 | ||
205 | hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) { | |
c7995c43 | 206 | if (vxlan->default_dst.remote_vni == id) |
d342894c | 207 | return vxlan; |
208 | } | |
209 | ||
210 | return NULL; | |
211 | } | |
212 | ||
213 | /* Fill in neighbour message in skbuff. */ | |
214 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
234f5b73 SH |
215 | const struct vxlan_fdb *fdb, |
216 | u32 portid, u32 seq, int type, unsigned int flags, | |
217 | const struct vxlan_rdst *rdst) | |
d342894c | 218 | { |
219 | unsigned long now = jiffies; | |
220 | struct nda_cacheinfo ci; | |
221 | struct nlmsghdr *nlh; | |
222 | struct ndmsg *ndm; | |
e4f67add | 223 | bool send_ip, send_eth; |
d342894c | 224 | |
225 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
226 | if (nlh == NULL) | |
227 | return -EMSGSIZE; | |
228 | ||
229 | ndm = nlmsg_data(nlh); | |
230 | memset(ndm, 0, sizeof(*ndm)); | |
e4f67add DS |
231 | |
232 | send_eth = send_ip = true; | |
233 | ||
234 | if (type == RTM_GETNEIGH) { | |
235 | ndm->ndm_family = AF_INET; | |
6681712d | 236 | send_ip = rdst->remote_ip != htonl(INADDR_ANY); |
e4f67add DS |
237 | send_eth = !is_zero_ether_addr(fdb->eth_addr); |
238 | } else | |
239 | ndm->ndm_family = AF_BRIDGE; | |
d342894c | 240 | ndm->ndm_state = fdb->state; |
241 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
ae884082 | 242 | ndm->ndm_flags = fdb->flags; |
d342894c | 243 | ndm->ndm_type = NDA_DST; |
244 | ||
e4f67add | 245 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
d342894c | 246 | goto nla_put_failure; |
247 | ||
6681712d DS |
248 | if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip)) |
249 | goto nla_put_failure; | |
250 | ||
823aa873 | 251 | if (rdst->remote_port && rdst->remote_port != vxlan->dst_port && |
6681712d DS |
252 | nla_put_be16(skb, NDA_PORT, rdst->remote_port)) |
253 | goto nla_put_failure; | |
c7995c43 | 254 | if (rdst->remote_vni != vxlan->default_dst.remote_vni && |
60d9d4c6 | 255 | nla_put_u32(skb, NDA_VNI, rdst->remote_vni)) |
6681712d DS |
256 | goto nla_put_failure; |
257 | if (rdst->remote_ifindex && | |
258 | nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) | |
d342894c | 259 | goto nla_put_failure; |
260 | ||
261 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
262 | ci.ndm_confirmed = 0; | |
263 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
264 | ci.ndm_refcnt = 0; | |
265 | ||
266 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
267 | goto nla_put_failure; | |
268 | ||
269 | return nlmsg_end(skb, nlh); | |
270 | ||
271 | nla_put_failure: | |
272 | nlmsg_cancel(skb, nlh); | |
273 | return -EMSGSIZE; | |
274 | } | |
275 | ||
276 | static inline size_t vxlan_nlmsg_size(void) | |
277 | { | |
278 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
279 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
280 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
73cf3317 | 281 | + nla_total_size(sizeof(__be16)) /* NDA_PORT */ |
6681712d DS |
282 | + nla_total_size(sizeof(__be32)) /* NDA_VNI */ |
283 | + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ | |
d342894c | 284 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
285 | } | |
286 | ||
287 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
3e61aa8f | 288 | struct vxlan_fdb *fdb, int type) |
d342894c | 289 | { |
290 | struct net *net = dev_net(vxlan->dev); | |
291 | struct sk_buff *skb; | |
292 | int err = -ENOBUFS; | |
293 | ||
294 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
295 | if (skb == NULL) | |
296 | goto errout; | |
297 | ||
3e61aa8f | 298 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb)); |
d342894c | 299 | if (err < 0) { |
300 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
301 | WARN_ON(err == -EMSGSIZE); | |
302 | kfree_skb(skb); | |
303 | goto errout; | |
304 | } | |
305 | ||
306 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
307 | return; | |
308 | errout: | |
309 | if (err < 0) | |
310 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
311 | } | |
312 | ||
e4f67add DS |
313 | static void vxlan_ip_miss(struct net_device *dev, __be32 ipa) |
314 | { | |
315 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
bb3fd687 SH |
316 | struct vxlan_fdb f = { |
317 | .state = NUD_STALE, | |
318 | }; | |
319 | struct vxlan_rdst remote = { | |
320 | .remote_ip = ipa, /* goes to NDA_DST */ | |
321 | .remote_vni = VXLAN_N_VID, | |
322 | }; | |
3e61aa8f SH |
323 | |
324 | INIT_LIST_HEAD(&f.remotes); | |
325 | list_add_rcu(&remote.list, &f.remotes); | |
e4f67add DS |
326 | |
327 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
328 | } | |
329 | ||
330 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
331 | { | |
bb3fd687 SH |
332 | struct vxlan_fdb f = { |
333 | .state = NUD_STALE, | |
334 | }; | |
e4f67add | 335 | |
3e61aa8f | 336 | INIT_LIST_HEAD(&f.remotes); |
e4f67add DS |
337 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); |
338 | ||
339 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
340 | } | |
341 | ||
d342894c | 342 | /* Hash Ethernet address */ |
343 | static u32 eth_hash(const unsigned char *addr) | |
344 | { | |
345 | u64 value = get_unaligned((u64 *)addr); | |
346 | ||
347 | /* only want 6 bytes */ | |
348 | #ifdef __BIG_ENDIAN | |
d342894c | 349 | value >>= 16; |
321fb991 | 350 | #else |
351 | value <<= 16; | |
d342894c | 352 | #endif |
353 | return hash_64(value, FDB_HASH_BITS); | |
354 | } | |
355 | ||
356 | /* Hash chain to use given mac address */ | |
357 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
358 | const u8 *mac) | |
359 | { | |
360 | return &vxlan->fdb_head[eth_hash(mac)]; | |
361 | } | |
362 | ||
363 | /* Look up Ethernet address in forwarding table */ | |
014be2c8 | 364 | static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, |
d342894c | 365 | const u8 *mac) |
366 | ||
367 | { | |
368 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
369 | struct vxlan_fdb *f; | |
d342894c | 370 | |
b67bfe0d | 371 | hlist_for_each_entry_rcu(f, head, hlist) { |
d342894c | 372 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
373 | return f; | |
374 | } | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
014be2c8 SS |
379 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, |
380 | const u8 *mac) | |
381 | { | |
382 | struct vxlan_fdb *f; | |
383 | ||
384 | f = __vxlan_find_mac(vxlan, mac); | |
385 | if (f) | |
386 | f->used = jiffies; | |
387 | ||
388 | return f; | |
389 | } | |
390 | ||
6681712d DS |
391 | /* Add/update destinations for multicast */ |
392 | static int vxlan_fdb_append(struct vxlan_fdb *f, | |
73cf3317 | 393 | __be32 ip, __be16 port, __u32 vni, __u32 ifindex) |
6681712d | 394 | { |
3e61aa8f | 395 | struct vxlan_rdst *rd; |
6681712d | 396 | |
3e61aa8f SH |
397 | /* protected by vxlan->hash_lock */ |
398 | list_for_each_entry(rd, &f->remotes, list) { | |
6681712d DS |
399 | if (rd->remote_ip == ip && |
400 | rd->remote_port == port && | |
401 | rd->remote_vni == vni && | |
402 | rd->remote_ifindex == ifindex) | |
403 | return 0; | |
6681712d | 404 | } |
3e61aa8f | 405 | |
6681712d DS |
406 | rd = kmalloc(sizeof(*rd), GFP_ATOMIC); |
407 | if (rd == NULL) | |
408 | return -ENOBUFS; | |
409 | rd->remote_ip = ip; | |
410 | rd->remote_port = port; | |
411 | rd->remote_vni = vni; | |
412 | rd->remote_ifindex = ifindex; | |
3e61aa8f SH |
413 | |
414 | list_add_tail_rcu(&rd->list, &f->remotes); | |
415 | ||
6681712d DS |
416 | return 1; |
417 | } | |
418 | ||
d342894c | 419 | /* Add new entry to forwarding table -- assumes lock held */ |
420 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
421 | const u8 *mac, __be32 ip, | |
6681712d | 422 | __u16 state, __u16 flags, |
73cf3317 | 423 | __be16 port, __u32 vni, __u32 ifindex, |
ae884082 | 424 | __u8 ndm_flags) |
d342894c | 425 | { |
426 | struct vxlan_fdb *f; | |
427 | int notify = 0; | |
428 | ||
014be2c8 | 429 | f = __vxlan_find_mac(vxlan, mac); |
d342894c | 430 | if (f) { |
431 | if (flags & NLM_F_EXCL) { | |
432 | netdev_dbg(vxlan->dev, | |
433 | "lost race to create %pM\n", mac); | |
434 | return -EEXIST; | |
435 | } | |
436 | if (f->state != state) { | |
437 | f->state = state; | |
438 | f->updated = jiffies; | |
439 | notify = 1; | |
440 | } | |
ae884082 DS |
441 | if (f->flags != ndm_flags) { |
442 | f->flags = ndm_flags; | |
443 | f->updated = jiffies; | |
444 | notify = 1; | |
445 | } | |
6681712d DS |
446 | if ((flags & NLM_F_APPEND) && |
447 | is_multicast_ether_addr(f->eth_addr)) { | |
448 | int rc = vxlan_fdb_append(f, ip, port, vni, ifindex); | |
449 | ||
450 | if (rc < 0) | |
451 | return rc; | |
452 | notify |= rc; | |
453 | } | |
d342894c | 454 | } else { |
455 | if (!(flags & NLM_F_CREATE)) | |
456 | return -ENOENT; | |
457 | ||
458 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
459 | return -ENOSPC; | |
460 | ||
461 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
462 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
463 | if (!f) | |
464 | return -ENOMEM; | |
465 | ||
466 | notify = 1; | |
d342894c | 467 | f->state = state; |
ae884082 | 468 | f->flags = ndm_flags; |
d342894c | 469 | f->updated = f->used = jiffies; |
3e61aa8f | 470 | INIT_LIST_HEAD(&f->remotes); |
d342894c | 471 | memcpy(f->eth_addr, mac, ETH_ALEN); |
472 | ||
3e61aa8f SH |
473 | vxlan_fdb_append(f, ip, port, vni, ifindex); |
474 | ||
d342894c | 475 | ++vxlan->addrcnt; |
476 | hlist_add_head_rcu(&f->hlist, | |
477 | vxlan_fdb_head(vxlan, mac)); | |
478 | } | |
479 | ||
480 | if (notify) | |
481 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
6706c82e | 486 | static void vxlan_fdb_free(struct rcu_head *head) |
6681712d DS |
487 | { |
488 | struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); | |
3e61aa8f | 489 | struct vxlan_rdst *rd, *nd; |
6681712d | 490 | |
3e61aa8f | 491 | list_for_each_entry_safe(rd, nd, &f->remotes, list) |
6681712d | 492 | kfree(rd); |
6681712d DS |
493 | kfree(f); |
494 | } | |
495 | ||
d342894c | 496 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
497 | { | |
498 | netdev_dbg(vxlan->dev, | |
499 | "delete %pM\n", f->eth_addr); | |
500 | ||
501 | --vxlan->addrcnt; | |
502 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
503 | ||
504 | hlist_del_rcu(&f->hlist); | |
6681712d | 505 | call_rcu(&f->rcu, vxlan_fdb_free); |
d342894c | 506 | } |
507 | ||
508 | /* Add static entry (via netlink) */ | |
509 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
510 | struct net_device *dev, | |
511 | const unsigned char *addr, u16 flags) | |
512 | { | |
513 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
6681712d | 514 | struct net *net = dev_net(vxlan->dev); |
d342894c | 515 | __be32 ip; |
73cf3317 | 516 | __be16 port; |
517 | u32 vni, ifindex; | |
d342894c | 518 | int err; |
519 | ||
520 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
521 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
522 | ndm->ndm_state); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | if (tb[NDA_DST] == NULL) | |
527 | return -EINVAL; | |
528 | ||
529 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
530 | return -EAFNOSUPPORT; | |
531 | ||
532 | ip = nla_get_be32(tb[NDA_DST]); | |
533 | ||
6681712d | 534 | if (tb[NDA_PORT]) { |
73cf3317 | 535 | if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) |
6681712d | 536 | return -EINVAL; |
73cf3317 | 537 | port = nla_get_be16(tb[NDA_PORT]); |
6681712d | 538 | } else |
823aa873 | 539 | port = vxlan->dst_port; |
6681712d DS |
540 | |
541 | if (tb[NDA_VNI]) { | |
542 | if (nla_len(tb[NDA_VNI]) != sizeof(u32)) | |
543 | return -EINVAL; | |
544 | vni = nla_get_u32(tb[NDA_VNI]); | |
545 | } else | |
c7995c43 | 546 | vni = vxlan->default_dst.remote_vni; |
6681712d DS |
547 | |
548 | if (tb[NDA_IFINDEX]) { | |
5abb0029 | 549 | struct net_device *tdev; |
6681712d DS |
550 | |
551 | if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) | |
552 | return -EINVAL; | |
553 | ifindex = nla_get_u32(tb[NDA_IFINDEX]); | |
5abb0029 PS |
554 | tdev = dev_get_by_index(net, ifindex); |
555 | if (!tdev) | |
6681712d | 556 | return -EADDRNOTAVAIL; |
5abb0029 | 557 | dev_put(tdev); |
6681712d DS |
558 | } else |
559 | ifindex = 0; | |
560 | ||
d342894c | 561 | spin_lock_bh(&vxlan->hash_lock); |
73cf3317 | 562 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags, |
563 | port, vni, ifindex, ndm->ndm_flags); | |
d342894c | 564 | spin_unlock_bh(&vxlan->hash_lock); |
565 | ||
566 | return err; | |
567 | } | |
568 | ||
569 | /* Delete entry (via netlink) */ | |
1690be63 VY |
570 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
571 | struct net_device *dev, | |
d342894c | 572 | const unsigned char *addr) |
573 | { | |
574 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
575 | struct vxlan_fdb *f; | |
576 | int err = -ENOENT; | |
577 | ||
578 | spin_lock_bh(&vxlan->hash_lock); | |
579 | f = vxlan_find_mac(vxlan, addr); | |
580 | if (f) { | |
581 | vxlan_fdb_destroy(vxlan, f); | |
582 | err = 0; | |
583 | } | |
584 | spin_unlock_bh(&vxlan->hash_lock); | |
585 | ||
586 | return err; | |
587 | } | |
588 | ||
589 | /* Dump forwarding table */ | |
590 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
591 | struct net_device *dev, int idx) | |
592 | { | |
593 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
594 | unsigned int h; | |
595 | ||
596 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
597 | struct vxlan_fdb *f; | |
d342894c | 598 | int err; |
599 | ||
b67bfe0d | 600 | hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
6681712d | 601 | struct vxlan_rdst *rd; |
6681712d | 602 | |
3e61aa8f SH |
603 | if (idx < cb->args[0]) |
604 | goto skip; | |
605 | ||
606 | list_for_each_entry_rcu(rd, &f->remotes, list) { | |
6681712d DS |
607 | err = vxlan_fdb_info(skb, vxlan, f, |
608 | NETLINK_CB(cb->skb).portid, | |
609 | cb->nlh->nlmsg_seq, | |
610 | RTM_NEWNEIGH, | |
611 | NLM_F_MULTI, rd); | |
612 | if (err < 0) | |
3e61aa8f | 613 | goto out; |
6681712d | 614 | } |
3e61aa8f SH |
615 | skip: |
616 | ++idx; | |
d342894c | 617 | } |
618 | } | |
3e61aa8f | 619 | out: |
d342894c | 620 | return idx; |
621 | } | |
622 | ||
623 | /* Watch incoming packets to learn mapping between Ethernet address | |
624 | * and Tunnel endpoint. | |
26a41ae6 | 625 | * Return true if packet is bogus and should be droppped. |
d342894c | 626 | */ |
26a41ae6 | 627 | static bool vxlan_snoop(struct net_device *dev, |
d342894c | 628 | __be32 src_ip, const u8 *src_mac) |
629 | { | |
630 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
631 | struct vxlan_fdb *f; | |
d342894c | 632 | |
633 | f = vxlan_find_mac(vxlan, src_mac); | |
634 | if (likely(f)) { | |
3e61aa8f SH |
635 | struct vxlan_rdst *rdst = first_remote(f); |
636 | ||
637 | if (likely(rdst->remote_ip == src_ip)) | |
26a41ae6 | 638 | return false; |
639 | ||
640 | /* Don't migrate static entries, drop packets */ | |
eb064c3b | 641 | if (f->state & NUD_NOARP) |
26a41ae6 | 642 | return true; |
d342894c | 643 | |
644 | if (net_ratelimit()) | |
645 | netdev_info(dev, | |
646 | "%pM migrated from %pI4 to %pI4\n", | |
3e61aa8f | 647 | src_mac, &rdst->remote_ip, &src_ip); |
d342894c | 648 | |
3e61aa8f | 649 | rdst->remote_ip = src_ip; |
d342894c | 650 | f->updated = jiffies; |
8385f50a | 651 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); |
d342894c | 652 | } else { |
653 | /* learned new entry */ | |
654 | spin_lock(&vxlan->hash_lock); | |
3bf74b1a | 655 | |
656 | /* close off race between vxlan_flush and incoming packets */ | |
657 | if (netif_running(dev)) | |
658 | vxlan_fdb_create(vxlan, src_mac, src_ip, | |
659 | NUD_REACHABLE, | |
660 | NLM_F_EXCL|NLM_F_CREATE, | |
661 | vxlan->dst_port, | |
662 | vxlan->default_dst.remote_vni, | |
663 | 0, NTF_SELF); | |
d342894c | 664 | spin_unlock(&vxlan->hash_lock); |
665 | } | |
26a41ae6 | 666 | |
667 | return false; | |
d342894c | 668 | } |
669 | ||
670 | ||
671 | /* See if multicast group is already in use by other ID */ | |
7c47cedf | 672 | static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip) |
d342894c | 673 | { |
553675fb | 674 | struct vxlan_dev *vxlan; |
d342894c | 675 | |
553675fb | 676 | list_for_each_entry(vxlan, &vn->vxlan_list, next) { |
553675fb | 677 | if (!netif_running(vxlan->dev)) |
678 | continue; | |
d342894c | 679 | |
7c47cedf | 680 | if (vxlan->default_dst.remote_ip == remote_ip) |
553675fb | 681 | return true; |
682 | } | |
d342894c | 683 | |
684 | return false; | |
685 | } | |
686 | ||
7c47cedf | 687 | static void vxlan_sock_hold(struct vxlan_sock *vs) |
d342894c | 688 | { |
7c47cedf SH |
689 | atomic_inc(&vs->refcnt); |
690 | } | |
d342894c | 691 | |
1c51a915 | 692 | static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs) |
7c47cedf SH |
693 | { |
694 | if (!atomic_dec_and_test(&vs->refcnt)) | |
695 | return; | |
d342894c | 696 | |
1c51a915 | 697 | spin_lock(&vn->sock_lock); |
7c47cedf | 698 | hlist_del_rcu(&vs->hlist); |
1c51a915 SH |
699 | spin_unlock(&vn->sock_lock); |
700 | ||
7c47cedf | 701 | queue_work(vxlan_wq, &vs->del_work); |
d342894c | 702 | } |
703 | ||
7c47cedf SH |
704 | /* Callback to update multicast group membership. |
705 | * Scheduled when vxlan goes up/down. | |
706 | */ | |
707 | static void vxlan_igmp_work(struct work_struct *work) | |
d342894c | 708 | { |
7c47cedf SH |
709 | struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work); |
710 | struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id); | |
711 | struct vxlan_sock *vs = vxlan->vn_sock; | |
712 | struct sock *sk = vs->sock->sk; | |
d342894c | 713 | struct ip_mreqn mreq = { |
c7995c43 AW |
714 | .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, |
715 | .imr_ifindex = vxlan->default_dst.remote_ifindex, | |
d342894c | 716 | }; |
717 | ||
d342894c | 718 | lock_sock(sk); |
7c47cedf SH |
719 | if (vxlan_group_used(vn, vxlan->default_dst.remote_ip)) |
720 | ip_mc_join_group(sk, &mreq); | |
721 | else | |
722 | ip_mc_leave_group(sk, &mreq); | |
d342894c | 723 | release_sock(sk); |
d342894c | 724 | |
1c51a915 | 725 | vxlan_sock_release(vn, vs); |
7c47cedf | 726 | dev_put(vxlan->dev); |
d342894c | 727 | } |
728 | ||
729 | /* Callback from net/ipv4/udp.c to receive packets */ | |
730 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
731 | { | |
732 | struct iphdr *oip; | |
733 | struct vxlanhdr *vxh; | |
734 | struct vxlan_dev *vxlan; | |
e8171045 | 735 | struct pcpu_tstats *stats; |
553675fb | 736 | __be16 port; |
d342894c | 737 | __u32 vni; |
738 | int err; | |
739 | ||
740 | /* pop off outer UDP header */ | |
741 | __skb_pull(skb, sizeof(struct udphdr)); | |
742 | ||
743 | /* Need Vxlan and inner Ethernet header to be present */ | |
744 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
745 | goto error; | |
746 | ||
747 | /* Drop packets with reserved bits set */ | |
748 | vxh = (struct vxlanhdr *) skb->data; | |
749 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
750 | (vxh->vx_vni & htonl(0xff))) { | |
751 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
752 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
753 | goto error; | |
754 | } | |
755 | ||
756 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 757 | |
758 | /* Is this VNI defined? */ | |
759 | vni = ntohl(vxh->vx_vni) >> 8; | |
553675fb | 760 | port = inet_sk(sk)->inet_sport; |
761 | vxlan = vxlan_find_vni(sock_net(sk), vni, port); | |
d342894c | 762 | if (!vxlan) { |
553675fb | 763 | netdev_dbg(skb->dev, "unknown vni %d port %u\n", |
764 | vni, ntohs(port)); | |
d342894c | 765 | goto drop; |
766 | } | |
767 | ||
768 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
769 | vxlan->dev->stats.rx_length_errors++; | |
770 | vxlan->dev->stats.rx_errors++; | |
771 | goto drop; | |
772 | } | |
773 | ||
e4f67add DS |
774 | skb_reset_mac_header(skb); |
775 | ||
d342894c | 776 | /* Re-examine inner Ethernet packet */ |
777 | oip = ip_hdr(skb); | |
778 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 779 | |
780 | /* Ignore packet loops (and multicast echo) */ | |
781 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
782 | vxlan->dev->dev_addr) == 0) | |
783 | goto drop; | |
784 | ||
26a41ae6 | 785 | if ((vxlan->flags & VXLAN_F_LEARN) && |
786 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source)) | |
787 | goto drop; | |
d342894c | 788 | |
789 | __skb_tunnel_rx(skb, vxlan->dev); | |
790 | skb_reset_network_header(skb); | |
0afb1666 JG |
791 | |
792 | /* If the NIC driver gave us an encapsulated packet with | |
793 | * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, | |
794 | * leave the CHECKSUM_UNNECESSARY, the device checksummed it | |
795 | * for us. Otherwise force the upper layers to verify it. | |
796 | */ | |
797 | if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || | |
798 | !(vxlan->dev->features & NETIF_F_RXCSUM)) | |
799 | skb->ip_summed = CHECKSUM_NONE; | |
800 | ||
801 | skb->encapsulation = 0; | |
d342894c | 802 | |
803 | err = IP_ECN_decapsulate(oip, skb); | |
804 | if (unlikely(err)) { | |
805 | if (log_ecn_error) | |
806 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
807 | &oip->saddr, oip->tos); | |
808 | if (err > 1) { | |
809 | ++vxlan->dev->stats.rx_frame_errors; | |
810 | ++vxlan->dev->stats.rx_errors; | |
811 | goto drop; | |
812 | } | |
813 | } | |
814 | ||
e8171045 | 815 | stats = this_cpu_ptr(vxlan->dev->tstats); |
d342894c | 816 | u64_stats_update_begin(&stats->syncp); |
817 | stats->rx_packets++; | |
818 | stats->rx_bytes += skb->len; | |
819 | u64_stats_update_end(&stats->syncp); | |
820 | ||
821 | netif_rx(skb); | |
822 | ||
823 | return 0; | |
824 | error: | |
825 | /* Put UDP header back */ | |
826 | __skb_push(skb, sizeof(struct udphdr)); | |
827 | ||
828 | return 1; | |
829 | drop: | |
830 | /* Consume bad packet */ | |
831 | kfree_skb(skb); | |
832 | return 0; | |
833 | } | |
834 | ||
e4f67add DS |
835 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
836 | { | |
837 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
838 | struct arphdr *parp; | |
839 | u8 *arpptr, *sha; | |
840 | __be32 sip, tip; | |
841 | struct neighbour *n; | |
842 | ||
843 | if (dev->flags & IFF_NOARP) | |
844 | goto out; | |
845 | ||
846 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
847 | dev->stats.tx_dropped++; | |
848 | goto out; | |
849 | } | |
850 | parp = arp_hdr(skb); | |
851 | ||
852 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
853 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
854 | parp->ar_pro != htons(ETH_P_IP) || | |
855 | parp->ar_op != htons(ARPOP_REQUEST) || | |
856 | parp->ar_hln != dev->addr_len || | |
857 | parp->ar_pln != 4) | |
858 | goto out; | |
859 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
860 | sha = arpptr; | |
861 | arpptr += dev->addr_len; /* sha */ | |
862 | memcpy(&sip, arpptr, sizeof(sip)); | |
863 | arpptr += sizeof(sip); | |
864 | arpptr += dev->addr_len; /* tha */ | |
865 | memcpy(&tip, arpptr, sizeof(tip)); | |
866 | ||
867 | if (ipv4_is_loopback(tip) || | |
868 | ipv4_is_multicast(tip)) | |
869 | goto out; | |
870 | ||
871 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
872 | ||
873 | if (n) { | |
e4f67add DS |
874 | struct vxlan_fdb *f; |
875 | struct sk_buff *reply; | |
876 | ||
877 | if (!(n->nud_state & NUD_CONNECTED)) { | |
878 | neigh_release(n); | |
879 | goto out; | |
880 | } | |
881 | ||
882 | f = vxlan_find_mac(vxlan, n->ha); | |
3e61aa8f | 883 | if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) { |
e4f67add DS |
884 | /* bridge-local neighbor */ |
885 | neigh_release(n); | |
886 | goto out; | |
887 | } | |
888 | ||
889 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
890 | n->ha, sha); | |
891 | ||
892 | neigh_release(n); | |
893 | ||
894 | skb_reset_mac_header(reply); | |
895 | __skb_pull(reply, skb_network_offset(reply)); | |
896 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
897 | reply->pkt_type = PACKET_HOST; | |
898 | ||
899 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
900 | dev->stats.rx_dropped++; | |
901 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
902 | vxlan_ip_miss(dev, tip); | |
903 | out: | |
904 | consume_skb(skb); | |
905 | return NETDEV_TX_OK; | |
906 | } | |
907 | ||
908 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
909 | { | |
910 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
911 | struct neighbour *n; | |
912 | struct iphdr *pip; | |
913 | ||
914 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
915 | return false; | |
916 | ||
917 | n = NULL; | |
918 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
919 | case ETH_P_IP: | |
920 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
921 | return false; | |
922 | pip = ip_hdr(skb); | |
923 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
924 | break; | |
925 | default: | |
926 | return false; | |
927 | } | |
928 | ||
929 | if (n) { | |
930 | bool diff; | |
931 | ||
932 | diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; | |
933 | if (diff) { | |
934 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
935 | dev->addr_len); | |
936 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
937 | } | |
938 | neigh_release(n); | |
939 | return diff; | |
940 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
941 | vxlan_ip_miss(dev, pip->daddr); | |
942 | return false; | |
943 | } | |
944 | ||
553675fb | 945 | static void vxlan_sock_put(struct sk_buff *skb) |
1cad8715 | 946 | { |
947 | sock_put(skb->sk); | |
948 | } | |
949 | ||
950 | /* On transmit, associate with the tunnel socket */ | |
951 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
952 | { | |
553675fb | 953 | struct vxlan_dev *vxlan = netdev_priv(dev); |
954 | struct sock *sk = vxlan->vn_sock->sock->sk; | |
1cad8715 | 955 | |
956 | skb_orphan(skb); | |
957 | sock_hold(sk); | |
958 | skb->sk = sk; | |
553675fb | 959 | skb->destructor = vxlan_sock_put; |
1cad8715 | 960 | } |
961 | ||
05f47d69 | 962 | /* Compute source port for outgoing packet |
963 | * first choice to use L4 flow hash since it will spread | |
964 | * better and maybe available from hardware | |
965 | * secondary choice is to use jhash on the Ethernet header | |
966 | */ | |
7d836a76 | 967 | static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) |
05f47d69 | 968 | { |
969 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
970 | u32 hash; | |
971 | ||
972 | hash = skb_get_rxhash(skb); | |
973 | if (!hash) | |
974 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
975 | (__force u32) skb->protocol); | |
976 | ||
7d836a76 | 977 | return htons((((u64) hash * range) >> 32) + vxlan->port_min); |
05f47d69 | 978 | } |
979 | ||
05c0db08 PS |
980 | static int handle_offloads(struct sk_buff *skb) |
981 | { | |
982 | if (skb_is_gso(skb)) { | |
983 | int err = skb_unclone(skb, GFP_ATOMIC); | |
984 | if (unlikely(err)) | |
985 | return err; | |
986 | ||
f6ace502 | 987 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; |
05c0db08 PS |
988 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) |
989 | skb->ip_summed = CHECKSUM_NONE; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
9dcc71e1 SS |
994 | /* Bypass encapsulation if the destination is local */ |
995 | static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, | |
996 | struct vxlan_dev *dst_vxlan) | |
997 | { | |
998 | struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); | |
999 | struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); | |
1000 | ||
1001 | skb->pkt_type = PACKET_HOST; | |
1002 | skb->encapsulation = 0; | |
1003 | skb->dev = dst_vxlan->dev; | |
1004 | __skb_pull(skb, skb_network_offset(skb)); | |
1005 | ||
1006 | if (dst_vxlan->flags & VXLAN_F_LEARN) | |
9d9f163c MR |
1007 | vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK), |
1008 | eth_hdr(skb)->h_source); | |
9dcc71e1 SS |
1009 | |
1010 | u64_stats_update_begin(&tx_stats->syncp); | |
1011 | tx_stats->tx_packets++; | |
1012 | tx_stats->tx_bytes += skb->len; | |
1013 | u64_stats_update_end(&tx_stats->syncp); | |
1014 | ||
1015 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
1016 | u64_stats_update_begin(&rx_stats->syncp); | |
1017 | rx_stats->rx_packets++; | |
1018 | rx_stats->rx_bytes += skb->len; | |
1019 | u64_stats_update_end(&rx_stats->syncp); | |
1020 | } else { | |
1021 | skb->dev->stats.rx_dropped++; | |
1022 | } | |
1023 | } | |
1024 | ||
4ad16930 SH |
1025 | static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
1026 | struct vxlan_rdst *rdst, bool did_rsc) | |
d342894c | 1027 | { |
1028 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1029 | struct rtable *rt; | |
d342894c | 1030 | const struct iphdr *old_iph; |
d342894c | 1031 | struct vxlanhdr *vxh; |
1032 | struct udphdr *uh; | |
1033 | struct flowi4 fl4; | |
d342894c | 1034 | __be32 dst; |
7d836a76 | 1035 | __be16 src_port, dst_port; |
234f5b73 | 1036 | u32 vni; |
d342894c | 1037 | __be16 df = 0; |
1038 | __u8 tos, ttl; | |
0e6fbc5b | 1039 | int err; |
d342894c | 1040 | |
823aa873 | 1041 | dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port; |
6681712d DS |
1042 | vni = rdst->remote_vni; |
1043 | dst = rdst->remote_ip; | |
e4f67add DS |
1044 | |
1045 | if (!dst) { | |
1046 | if (did_rsc) { | |
e4f67add | 1047 | /* short-circuited back to local bridge */ |
9dcc71e1 | 1048 | vxlan_encap_bypass(skb, vxlan, vxlan); |
4ad16930 | 1049 | return; |
e4f67add | 1050 | } |
ef59febe | 1051 | goto drop; |
e4f67add | 1052 | } |
ef59febe | 1053 | |
d6727fe3 JG |
1054 | if (!skb->encapsulation) { |
1055 | skb_reset_inner_headers(skb); | |
1056 | skb->encapsulation = 1; | |
1057 | } | |
1058 | ||
d342894c | 1059 | /* Need space for new headers (invalidates iph ptr) */ |
1060 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
1061 | goto drop; | |
1062 | ||
d342894c | 1063 | old_iph = ip_hdr(skb); |
1064 | ||
d342894c | 1065 | ttl = vxlan->ttl; |
1066 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
1067 | ttl = 1; | |
1068 | ||
1069 | tos = vxlan->tos; | |
1070 | if (tos == 1) | |
206aaafc | 1071 | tos = ip_tunnel_get_dsfield(old_iph, skb); |
d342894c | 1072 | |
05f47d69 | 1073 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 1074 | |
ca78f181 | 1075 | memset(&fl4, 0, sizeof(fl4)); |
6681712d | 1076 | fl4.flowi4_oif = rdst->remote_ifindex; |
ca78f181 | 1077 | fl4.flowi4_tos = RT_TOS(tos); |
1078 | fl4.daddr = dst; | |
1079 | fl4.saddr = vxlan->saddr; | |
1080 | ||
1081 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 1082 | if (IS_ERR(rt)) { |
1083 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
1084 | dev->stats.tx_carrier_errors++; | |
1085 | goto tx_error; | |
1086 | } | |
1087 | ||
1088 | if (rt->dst.dev == dev) { | |
1089 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
1090 | ip_rt_put(rt); | |
1091 | dev->stats.collisions++; | |
1092 | goto tx_error; | |
1093 | } | |
1094 | ||
9dcc71e1 | 1095 | /* Bypass encapsulation if the destination is local */ |
ab09a6d0 MR |
1096 | if (rt->rt_flags & RTCF_LOCAL && |
1097 | !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { | |
9dcc71e1 SS |
1098 | struct vxlan_dev *dst_vxlan; |
1099 | ||
1100 | ip_rt_put(rt); | |
553675fb | 1101 | dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port); |
9dcc71e1 SS |
1102 | if (!dst_vxlan) |
1103 | goto tx_error; | |
1104 | vxlan_encap_bypass(skb, vxlan, dst_vxlan); | |
4ad16930 | 1105 | return; |
9dcc71e1 | 1106 | } |
d342894c | 1107 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); |
1108 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
6681712d | 1109 | vxh->vx_vni = htonl(vni << 8); |
d342894c | 1110 | |
1111 | __skb_push(skb, sizeof(*uh)); | |
1112 | skb_reset_transport_header(skb); | |
1113 | uh = udp_hdr(skb); | |
1114 | ||
73cf3317 | 1115 | uh->dest = dst_port; |
7d836a76 | 1116 | uh->source = src_port; |
d342894c | 1117 | |
1118 | uh->len = htons(skb->len); | |
1119 | uh->check = 0; | |
1120 | ||
1cad8715 | 1121 | vxlan_set_owner(dev, skb); |
1122 | ||
05c0db08 PS |
1123 | if (handle_offloads(skb)) |
1124 | goto drop; | |
d342894c | 1125 | |
0e6fbc5b PS |
1126 | tos = ip_tunnel_ecn_encap(tos, old_iph, skb); |
1127 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
1128 | ||
1129 | err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst, | |
1130 | IPPROTO_UDP, tos, ttl, df); | |
1131 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); | |
1132 | ||
4ad16930 | 1133 | return; |
d342894c | 1134 | |
1135 | drop: | |
1136 | dev->stats.tx_dropped++; | |
1137 | goto tx_free; | |
1138 | ||
1139 | tx_error: | |
1140 | dev->stats.tx_errors++; | |
1141 | tx_free: | |
1142 | dev_kfree_skb(skb); | |
d342894c | 1143 | } |
1144 | ||
6681712d DS |
1145 | /* Transmit local packets over Vxlan |
1146 | * | |
1147 | * Outer IP header inherits ECN and DF from inner header. | |
1148 | * Outer UDP destination is the VXLAN assigned port. | |
1149 | * source port is based on hash of flow | |
1150 | */ | |
1151 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
1152 | { | |
1153 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1154 | struct ethhdr *eth; | |
1155 | bool did_rsc = false; | |
afbd8bae | 1156 | struct vxlan_rdst *rdst; |
6681712d | 1157 | struct vxlan_fdb *f; |
6681712d DS |
1158 | |
1159 | skb_reset_mac_header(skb); | |
1160 | eth = eth_hdr(skb); | |
1161 | ||
1162 | if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) | |
1163 | return arp_reduce(dev, skb); | |
6681712d DS |
1164 | |
1165 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
ae884082 DS |
1166 | did_rsc = false; |
1167 | ||
1168 | if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) && | |
1169 | ntohs(eth->h_proto) == ETH_P_IP) { | |
1170 | did_rsc = route_shortcircuit(dev, skb); | |
1171 | if (did_rsc) | |
1172 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
1173 | } | |
1174 | ||
6681712d | 1175 | if (f == NULL) { |
afbd8bae MR |
1176 | f = vxlan_find_mac(vxlan, all_zeros_mac); |
1177 | if (f == NULL) { | |
1178 | if ((vxlan->flags & VXLAN_F_L2MISS) && | |
1179 | !is_multicast_ether_addr(eth->h_dest)) | |
1180 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
1181 | ||
1182 | dev->stats.tx_dropped++; | |
1183 | dev_kfree_skb(skb); | |
1184 | return NETDEV_TX_OK; | |
1185 | } | |
1186 | } | |
6681712d | 1187 | |
afbd8bae MR |
1188 | list_for_each_entry_rcu(rdst, &f->remotes, list) { |
1189 | struct sk_buff *skb1; | |
6681712d | 1190 | |
afbd8bae MR |
1191 | skb1 = skb_clone(skb, GFP_ATOMIC); |
1192 | if (skb1) | |
1193 | vxlan_xmit_one(skb1, dev, rdst, did_rsc); | |
6681712d DS |
1194 | } |
1195 | ||
afbd8bae | 1196 | dev_kfree_skb(skb); |
4ad16930 | 1197 | return NETDEV_TX_OK; |
6681712d DS |
1198 | } |
1199 | ||
d342894c | 1200 | /* Walk the forwarding table and purge stale entries */ |
1201 | static void vxlan_cleanup(unsigned long arg) | |
1202 | { | |
1203 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
1204 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
1205 | unsigned int h; | |
1206 | ||
1207 | if (!netif_running(vxlan->dev)) | |
1208 | return; | |
1209 | ||
1210 | spin_lock_bh(&vxlan->hash_lock); | |
1211 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1212 | struct hlist_node *p, *n; | |
1213 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1214 | struct vxlan_fdb *f | |
1215 | = container_of(p, struct vxlan_fdb, hlist); | |
1216 | unsigned long timeout; | |
1217 | ||
3c172868 | 1218 | if (f->state & NUD_PERMANENT) |
d342894c | 1219 | continue; |
1220 | ||
1221 | timeout = f->used + vxlan->age_interval * HZ; | |
1222 | if (time_before_eq(timeout, jiffies)) { | |
1223 | netdev_dbg(vxlan->dev, | |
1224 | "garbage collect %pM\n", | |
1225 | f->eth_addr); | |
1226 | f->state = NUD_STALE; | |
1227 | vxlan_fdb_destroy(vxlan, f); | |
1228 | } else if (time_before(timeout, next_timer)) | |
1229 | next_timer = timeout; | |
1230 | } | |
1231 | } | |
1232 | spin_unlock_bh(&vxlan->hash_lock); | |
1233 | ||
1234 | mod_timer(&vxlan->age_timer, next_timer); | |
1235 | } | |
1236 | ||
1237 | /* Setup stats when device is created */ | |
1238 | static int vxlan_init(struct net_device *dev) | |
1239 | { | |
1c51a915 SH |
1240 | struct vxlan_dev *vxlan = netdev_priv(dev); |
1241 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
1242 | struct vxlan_sock *vs; | |
1243 | __u32 vni = vxlan->default_dst.remote_vni; | |
1244 | ||
e8171045 PS |
1245 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1246 | if (!dev->tstats) | |
d342894c | 1247 | return -ENOMEM; |
1248 | ||
1c51a915 SH |
1249 | spin_lock(&vn->sock_lock); |
1250 | vs = vxlan_find_port(dev_net(dev), vxlan->dst_port); | |
1251 | if (vs) { | |
1252 | /* If we have a socket with same port already, reuse it */ | |
1253 | atomic_inc(&vs->refcnt); | |
1254 | vxlan->vn_sock = vs; | |
1255 | hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni)); | |
1256 | } else { | |
1257 | /* otherwise make new socket outside of RTNL */ | |
1258 | dev_hold(dev); | |
1259 | queue_work(vxlan_wq, &vxlan->sock_work); | |
1260 | } | |
1261 | spin_unlock(&vn->sock_lock); | |
1262 | ||
d342894c | 1263 | return 0; |
1264 | } | |
1265 | ||
afbd8bae MR |
1266 | static void vxlan_fdb_delete_defualt(struct vxlan_dev *vxlan) |
1267 | { | |
1268 | struct vxlan_fdb *f; | |
1269 | ||
1270 | spin_lock_bh(&vxlan->hash_lock); | |
1271 | f = __vxlan_find_mac(vxlan, all_zeros_mac); | |
1272 | if (f) | |
1273 | vxlan_fdb_destroy(vxlan, f); | |
1274 | spin_unlock_bh(&vxlan->hash_lock); | |
1275 | } | |
1276 | ||
ebf4063e SH |
1277 | static void vxlan_uninit(struct net_device *dev) |
1278 | { | |
1279 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1280 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
1281 | struct vxlan_sock *vs = vxlan->vn_sock; | |
1282 | ||
afbd8bae MR |
1283 | vxlan_fdb_delete_defualt(vxlan); |
1284 | ||
ebf4063e SH |
1285 | if (vs) |
1286 | vxlan_sock_release(vn, vs); | |
1287 | free_percpu(dev->tstats); | |
1288 | } | |
1289 | ||
d342894c | 1290 | /* Start ageing timer and join group when device is brought up */ |
1291 | static int vxlan_open(struct net_device *dev) | |
1292 | { | |
1293 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1c51a915 SH |
1294 | struct vxlan_sock *vs = vxlan->vn_sock; |
1295 | ||
1296 | /* socket hasn't been created */ | |
1297 | if (!vs) | |
1298 | return -ENOTCONN; | |
d342894c | 1299 | |
c7995c43 | 1300 | if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
1c51a915 | 1301 | vxlan_sock_hold(vs); |
7c47cedf SH |
1302 | dev_hold(dev); |
1303 | queue_work(vxlan_wq, &vxlan->igmp_work); | |
d342894c | 1304 | } |
1305 | ||
1306 | if (vxlan->age_interval) | |
1307 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /* Purge the forwarding table */ | |
1313 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
1314 | { | |
31fec5aa | 1315 | unsigned int h; |
d342894c | 1316 | |
1317 | spin_lock_bh(&vxlan->hash_lock); | |
1318 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1319 | struct hlist_node *p, *n; | |
1320 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1321 | struct vxlan_fdb *f | |
1322 | = container_of(p, struct vxlan_fdb, hlist); | |
afbd8bae MR |
1323 | /* the all_zeros_mac entry is deleted at vxlan_uninit */ |
1324 | if (!is_zero_ether_addr(f->eth_addr)) | |
1325 | vxlan_fdb_destroy(vxlan, f); | |
d342894c | 1326 | } |
1327 | } | |
1328 | spin_unlock_bh(&vxlan->hash_lock); | |
1329 | } | |
1330 | ||
1331 | /* Cleanup timer and forwarding table on shutdown */ | |
1332 | static int vxlan_stop(struct net_device *dev) | |
1333 | { | |
1334 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1c51a915 | 1335 | struct vxlan_sock *vs = vxlan->vn_sock; |
d342894c | 1336 | |
1c51a915 SH |
1337 | if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
1338 | vxlan_sock_hold(vs); | |
7c47cedf SH |
1339 | dev_hold(dev); |
1340 | queue_work(vxlan_wq, &vxlan->igmp_work); | |
1341 | } | |
d342894c | 1342 | |
1343 | del_timer_sync(&vxlan->age_timer); | |
1344 | ||
1345 | vxlan_flush(vxlan); | |
1346 | ||
1347 | return 0; | |
1348 | } | |
1349 | ||
d342894c | 1350 | /* Stub, nothing needs to be done. */ |
1351 | static void vxlan_set_multicast_list(struct net_device *dev) | |
1352 | { | |
1353 | } | |
1354 | ||
1355 | static const struct net_device_ops vxlan_netdev_ops = { | |
1356 | .ndo_init = vxlan_init, | |
ebf4063e | 1357 | .ndo_uninit = vxlan_uninit, |
d342894c | 1358 | .ndo_open = vxlan_open, |
1359 | .ndo_stop = vxlan_stop, | |
1360 | .ndo_start_xmit = vxlan_xmit, | |
e8171045 | 1361 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
d342894c | 1362 | .ndo_set_rx_mode = vxlan_set_multicast_list, |
1363 | .ndo_change_mtu = eth_change_mtu, | |
1364 | .ndo_validate_addr = eth_validate_addr, | |
1365 | .ndo_set_mac_address = eth_mac_addr, | |
1366 | .ndo_fdb_add = vxlan_fdb_add, | |
1367 | .ndo_fdb_del = vxlan_fdb_delete, | |
1368 | .ndo_fdb_dump = vxlan_fdb_dump, | |
1369 | }; | |
1370 | ||
1371 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1372 | static struct device_type vxlan_type = { | |
1373 | .name = "vxlan", | |
1374 | }; | |
1375 | ||
d342894c | 1376 | /* Initialize the device structure. */ |
1377 | static void vxlan_setup(struct net_device *dev) | |
1378 | { | |
1379 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
31fec5aa | 1380 | unsigned int h; |
05f47d69 | 1381 | int low, high; |
d342894c | 1382 | |
1383 | eth_hw_addr_random(dev); | |
1384 | ether_setup(dev); | |
2840bf22 | 1385 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 1386 | |
1387 | dev->netdev_ops = &vxlan_netdev_ops; | |
ebf4063e | 1388 | dev->destructor = free_netdev; |
d342894c | 1389 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); |
1390 | ||
1391 | dev->tx_queue_len = 0; | |
1392 | dev->features |= NETIF_F_LLTX; | |
1393 | dev->features |= NETIF_F_NETNS_LOCAL; | |
d6727fe3 | 1394 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
0afb1666 | 1395 | dev->features |= NETIF_F_RXCSUM; |
05c0db08 | 1396 | dev->features |= NETIF_F_GSO_SOFTWARE; |
0afb1666 JG |
1397 | |
1398 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
05c0db08 | 1399 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
d342894c | 1400 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
6602d007 | 1401 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d342894c | 1402 | |
553675fb | 1403 | INIT_LIST_HEAD(&vxlan->next); |
d342894c | 1404 | spin_lock_init(&vxlan->hash_lock); |
7c47cedf | 1405 | INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work); |
1c51a915 | 1406 | INIT_WORK(&vxlan->sock_work, vxlan_sock_work); |
d342894c | 1407 | |
1408 | init_timer_deferrable(&vxlan->age_timer); | |
1409 | vxlan->age_timer.function = vxlan_cleanup; | |
1410 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1411 | ||
05f47d69 | 1412 | inet_get_local_port_range(&low, &high); |
1413 | vxlan->port_min = low; | |
1414 | vxlan->port_max = high; | |
823aa873 | 1415 | vxlan->dst_port = htons(vxlan_port); |
05f47d69 | 1416 | |
d342894c | 1417 | vxlan->dev = dev; |
1418 | ||
1419 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1420 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1421 | } | |
1422 | ||
1423 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1424 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
5d174dd8 | 1425 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
d342894c | 1426 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, |
1427 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1428 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1429 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1430 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1431 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1432 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1433 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
e4f67add DS |
1434 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
1435 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
1436 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
1437 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
823aa873 | 1438 | [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, |
d342894c | 1439 | }; |
1440 | ||
1441 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1442 | { | |
1443 | if (tb[IFLA_ADDRESS]) { | |
1444 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1445 | pr_debug("invalid link address (not ethernet)\n"); | |
1446 | return -EINVAL; | |
1447 | } | |
1448 | ||
1449 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1450 | pr_debug("invalid all zero ethernet address\n"); | |
1451 | return -EADDRNOTAVAIL; | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | if (!data) | |
1456 | return -EINVAL; | |
1457 | ||
1458 | if (data[IFLA_VXLAN_ID]) { | |
1459 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1460 | if (id >= VXLAN_VID_MASK) | |
1461 | return -ERANGE; | |
1462 | } | |
1463 | ||
05f47d69 | 1464 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1465 | const struct ifla_vxlan_port_range *p | |
1466 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1467 | ||
1468 | if (ntohs(p->high) < ntohs(p->low)) { | |
1469 | pr_debug("port range %u .. %u not valid\n", | |
1470 | ntohs(p->low), ntohs(p->high)); | |
1471 | return -EINVAL; | |
1472 | } | |
1473 | } | |
1474 | ||
d342894c | 1475 | return 0; |
1476 | } | |
1477 | ||
1b13c97f YB |
1478 | static void vxlan_get_drvinfo(struct net_device *netdev, |
1479 | struct ethtool_drvinfo *drvinfo) | |
1480 | { | |
1481 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
1482 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
1483 | } | |
1484 | ||
1485 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
1486 | .get_drvinfo = vxlan_get_drvinfo, | |
1487 | .get_link = ethtool_op_get_link, | |
1488 | }; | |
1489 | ||
553675fb | 1490 | static void vxlan_del_work(struct work_struct *work) |
1491 | { | |
1492 | struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work); | |
1493 | ||
1494 | sk_release_kernel(vs->sock->sk); | |
1495 | kfree_rcu(vs, rcu); | |
1496 | } | |
1497 | ||
553675fb | 1498 | static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port) |
1499 | { | |
1500 | struct vxlan_sock *vs; | |
1501 | struct sock *sk; | |
1502 | struct sockaddr_in vxlan_addr = { | |
1503 | .sin_family = AF_INET, | |
1504 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
bb3fd687 | 1505 | .sin_port = port, |
553675fb | 1506 | }; |
1507 | int rc; | |
31fec5aa | 1508 | unsigned int h; |
553675fb | 1509 | |
1510 | vs = kmalloc(sizeof(*vs), GFP_KERNEL); | |
1511 | if (!vs) | |
1512 | return ERR_PTR(-ENOMEM); | |
1513 | ||
1514 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1515 | INIT_HLIST_HEAD(&vs->vni_list[h]); | |
1516 | ||
1517 | INIT_WORK(&vs->del_work, vxlan_del_work); | |
1518 | ||
1519 | /* Create UDP socket for encapsulation receive. */ | |
1520 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock); | |
1521 | if (rc < 0) { | |
1522 | pr_debug("UDP socket create failed\n"); | |
1523 | kfree(vs); | |
1524 | return ERR_PTR(rc); | |
1525 | } | |
1526 | ||
1527 | /* Put in proper namespace */ | |
1528 | sk = vs->sock->sk; | |
1529 | sk_change_net(sk, net); | |
1530 | ||
553675fb | 1531 | rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr, |
1532 | sizeof(vxlan_addr)); | |
1533 | if (rc < 0) { | |
1534 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1535 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
1536 | sk_release_kernel(sk); | |
1537 | kfree(vs); | |
1538 | return ERR_PTR(rc); | |
1539 | } | |
1540 | ||
1541 | /* Disable multicast loopback */ | |
1542 | inet_sk(sk)->mc_loop = 0; | |
1543 | ||
1544 | /* Mark socket as an encapsulation socket. */ | |
1545 | udp_sk(sk)->encap_type = 1; | |
1546 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1547 | udp_encap_enable(); | |
7c47cedf | 1548 | atomic_set(&vs->refcnt, 1); |
553675fb | 1549 | |
553675fb | 1550 | return vs; |
1551 | } | |
1552 | ||
1c51a915 SH |
1553 | /* Scheduled at device creation to bind to a socket */ |
1554 | static void vxlan_sock_work(struct work_struct *work) | |
1555 | { | |
1556 | struct vxlan_dev *vxlan | |
1557 | = container_of(work, struct vxlan_dev, sock_work); | |
1558 | struct net_device *dev = vxlan->dev; | |
1559 | struct net *net = dev_net(dev); | |
1560 | __u32 vni = vxlan->default_dst.remote_vni; | |
1561 | __be16 port = vxlan->dst_port; | |
1562 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1563 | struct vxlan_sock *nvs, *ovs; | |
1564 | ||
1565 | nvs = vxlan_socket_create(net, port); | |
1566 | if (IS_ERR(nvs)) { | |
1567 | netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n", | |
1568 | PTR_ERR(nvs)); | |
1569 | goto out; | |
1570 | } | |
1571 | ||
1572 | spin_lock(&vn->sock_lock); | |
1573 | /* Look again to see if can reuse socket */ | |
1574 | ovs = vxlan_find_port(net, port); | |
1575 | if (ovs) { | |
1576 | atomic_inc(&ovs->refcnt); | |
1577 | vxlan->vn_sock = ovs; | |
1578 | hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni)); | |
1579 | spin_unlock(&vn->sock_lock); | |
1580 | ||
1581 | sk_release_kernel(nvs->sock->sk); | |
1582 | kfree(nvs); | |
1583 | } else { | |
1584 | vxlan->vn_sock = nvs; | |
1585 | hlist_add_head_rcu(&nvs->hlist, vs_head(net, port)); | |
1586 | hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni)); | |
1587 | spin_unlock(&vn->sock_lock); | |
1588 | } | |
1589 | out: | |
1590 | dev_put(dev); | |
1591 | } | |
1592 | ||
d342894c | 1593 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1594 | struct nlattr *tb[], struct nlattr *data[]) | |
1595 | { | |
553675fb | 1596 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
d342894c | 1597 | struct vxlan_dev *vxlan = netdev_priv(dev); |
c7995c43 | 1598 | struct vxlan_rdst *dst = &vxlan->default_dst; |
d342894c | 1599 | __u32 vni; |
1600 | int err; | |
1601 | ||
1602 | if (!data[IFLA_VXLAN_ID]) | |
1603 | return -EINVAL; | |
1604 | ||
1605 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
c7995c43 | 1606 | dst->remote_vni = vni; |
d342894c | 1607 | |
5d174dd8 | 1608 | if (data[IFLA_VXLAN_GROUP]) |
1609 | dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
d342894c | 1610 | |
1611 | if (data[IFLA_VXLAN_LOCAL]) | |
1612 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1613 | ||
34e02aa1 | 1614 | if (data[IFLA_VXLAN_LINK] && |
c7995c43 | 1615 | (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) { |
34e02aa1 | 1616 | struct net_device *lowerdev |
c7995c43 | 1617 | = __dev_get_by_index(net, dst->remote_ifindex); |
34e02aa1 | 1618 | |
1619 | if (!lowerdev) { | |
c7995c43 | 1620 | pr_info("ifindex %d does not exist\n", dst->remote_ifindex); |
34e02aa1 | 1621 | return -ENODEV; |
1622 | } | |
d342894c | 1623 | |
34e02aa1 | 1624 | if (!tb[IFLA_MTU]) |
d342894c | 1625 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1ba56fb4 AD |
1626 | |
1627 | /* update header length based on lower device */ | |
1628 | dev->hard_header_len = lowerdev->hard_header_len + | |
1629 | VXLAN_HEADROOM; | |
d342894c | 1630 | } |
1631 | ||
1632 | if (data[IFLA_VXLAN_TOS]) | |
1633 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1634 | ||
afb97186 VB |
1635 | if (data[IFLA_VXLAN_TTL]) |
1636 | vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
1637 | ||
d342894c | 1638 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
e4f67add | 1639 | vxlan->flags |= VXLAN_F_LEARN; |
d342894c | 1640 | |
1641 | if (data[IFLA_VXLAN_AGEING]) | |
1642 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1643 | else | |
1644 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1645 | ||
e4f67add DS |
1646 | if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) |
1647 | vxlan->flags |= VXLAN_F_PROXY; | |
1648 | ||
1649 | if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) | |
1650 | vxlan->flags |= VXLAN_F_RSC; | |
1651 | ||
1652 | if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) | |
1653 | vxlan->flags |= VXLAN_F_L2MISS; | |
1654 | ||
1655 | if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) | |
1656 | vxlan->flags |= VXLAN_F_L3MISS; | |
1657 | ||
d342894c | 1658 | if (data[IFLA_VXLAN_LIMIT]) |
1659 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1660 | ||
05f47d69 | 1661 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1662 | const struct ifla_vxlan_port_range *p | |
1663 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1664 | vxlan->port_min = ntohs(p->low); | |
1665 | vxlan->port_max = ntohs(p->high); | |
1666 | } | |
1667 | ||
823aa873 | 1668 | if (data[IFLA_VXLAN_PORT]) |
1669 | vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); | |
1670 | ||
553675fb | 1671 | if (vxlan_find_vni(net, vni, vxlan->dst_port)) { |
1672 | pr_info("duplicate VNI %u\n", vni); | |
1673 | return -EEXIST; | |
1674 | } | |
1675 | ||
1b13c97f YB |
1676 | SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); |
1677 | ||
afbd8bae MR |
1678 | /* create an fdb entry for default destination */ |
1679 | err = vxlan_fdb_create(vxlan, all_zeros_mac, | |
1680 | vxlan->default_dst.remote_ip, | |
1681 | NUD_REACHABLE|NUD_PERMANENT, | |
1682 | NLM_F_EXCL|NLM_F_CREATE, | |
1683 | vxlan->dst_port, vxlan->default_dst.remote_vni, | |
1684 | vxlan->default_dst.remote_ifindex, NTF_SELF); | |
1c51a915 | 1685 | if (err) |
553675fb | 1686 | return err; |
d342894c | 1687 | |
afbd8bae MR |
1688 | err = register_netdevice(dev); |
1689 | if (err) { | |
1690 | vxlan_fdb_delete_defualt(vxlan); | |
1691 | return err; | |
1692 | } | |
1693 | ||
553675fb | 1694 | list_add(&vxlan->next, &vn->vxlan_list); |
553675fb | 1695 | |
1696 | return 0; | |
d342894c | 1697 | } |
1698 | ||
1699 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1700 | { | |
1701 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1702 | ||
1703 | hlist_del_rcu(&vxlan->hlist); | |
553675fb | 1704 | list_del(&vxlan->next); |
d342894c | 1705 | unregister_netdevice_queue(dev, head); |
1706 | } | |
1707 | ||
1708 | static size_t vxlan_get_size(const struct net_device *dev) | |
1709 | { | |
1710 | ||
1711 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
5d174dd8 | 1712 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ |
d342894c | 1713 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ |
1714 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1715 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1716 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1717 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
e4f67add DS |
1718 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ |
1719 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
1720 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
1721 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
d342894c | 1722 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1723 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1724 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
823aa873 | 1725 | nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */ |
d342894c | 1726 | 0; |
1727 | } | |
1728 | ||
1729 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1730 | { | |
1731 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
c7995c43 | 1732 | const struct vxlan_rdst *dst = &vxlan->default_dst; |
05f47d69 | 1733 | struct ifla_vxlan_port_range ports = { |
1734 | .low = htons(vxlan->port_min), | |
1735 | .high = htons(vxlan->port_max), | |
1736 | }; | |
d342894c | 1737 | |
c7995c43 | 1738 | if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni)) |
d342894c | 1739 | goto nla_put_failure; |
1740 | ||
5d174dd8 | 1741 | if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip)) |
d342894c | 1742 | goto nla_put_failure; |
1743 | ||
c7995c43 | 1744 | if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) |
d342894c | 1745 | goto nla_put_failure; |
1746 | ||
7c41c42c | 1747 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1748 | goto nla_put_failure; |
1749 | ||
1750 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1751 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
e4f67add DS |
1752 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, |
1753 | !!(vxlan->flags & VXLAN_F_LEARN)) || | |
1754 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
1755 | !!(vxlan->flags & VXLAN_F_PROXY)) || | |
1756 | nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || | |
1757 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
1758 | !!(vxlan->flags & VXLAN_F_L2MISS)) || | |
1759 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
1760 | !!(vxlan->flags & VXLAN_F_L3MISS)) || | |
d342894c | 1761 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
823aa873 | 1762 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) || |
1763 | nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port)) | |
d342894c | 1764 | goto nla_put_failure; |
1765 | ||
05f47d69 | 1766 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1767 | goto nla_put_failure; | |
1768 | ||
d342894c | 1769 | return 0; |
1770 | ||
1771 | nla_put_failure: | |
1772 | return -EMSGSIZE; | |
1773 | } | |
1774 | ||
1775 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1776 | .kind = "vxlan", | |
1777 | .maxtype = IFLA_VXLAN_MAX, | |
1778 | .policy = vxlan_policy, | |
1779 | .priv_size = sizeof(struct vxlan_dev), | |
1780 | .setup = vxlan_setup, | |
1781 | .validate = vxlan_validate, | |
1782 | .newlink = vxlan_newlink, | |
1783 | .dellink = vxlan_dellink, | |
1784 | .get_size = vxlan_get_size, | |
1785 | .fill_info = vxlan_fill_info, | |
1786 | }; | |
1787 | ||
1788 | static __net_init int vxlan_init_net(struct net *net) | |
1789 | { | |
1790 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
31fec5aa | 1791 | unsigned int h; |
d342894c | 1792 | |
553675fb | 1793 | INIT_LIST_HEAD(&vn->vxlan_list); |
1c51a915 | 1794 | spin_lock_init(&vn->sock_lock); |
d342894c | 1795 | |
553675fb | 1796 | for (h = 0; h < PORT_HASH_SIZE; ++h) |
1797 | INIT_HLIST_HEAD(&vn->sock_list[h]); | |
d342894c | 1798 | |
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | static __net_exit void vxlan_exit_net(struct net *net) | |
1803 | { | |
1804 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
9cb6cb7e | 1805 | struct vxlan_dev *vxlan; |
9cb6cb7e ZM |
1806 | |
1807 | rtnl_lock(); | |
553675fb | 1808 | list_for_each_entry(vxlan, &vn->vxlan_list, next) |
1809 | dev_close(vxlan->dev); | |
9cb6cb7e | 1810 | rtnl_unlock(); |
d342894c | 1811 | } |
1812 | ||
1813 | static struct pernet_operations vxlan_net_ops = { | |
1814 | .init = vxlan_init_net, | |
1815 | .exit = vxlan_exit_net, | |
1816 | .id = &vxlan_net_id, | |
1817 | .size = sizeof(struct vxlan_net), | |
1818 | }; | |
1819 | ||
1820 | static int __init vxlan_init_module(void) | |
1821 | { | |
1822 | int rc; | |
1823 | ||
758c57d1 SH |
1824 | vxlan_wq = alloc_workqueue("vxlan", 0, 0); |
1825 | if (!vxlan_wq) | |
1826 | return -ENOMEM; | |
1827 | ||
d342894c | 1828 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); |
1829 | ||
1830 | rc = register_pernet_device(&vxlan_net_ops); | |
1831 | if (rc) | |
1832 | goto out1; | |
1833 | ||
1834 | rc = rtnl_link_register(&vxlan_link_ops); | |
1835 | if (rc) | |
1836 | goto out2; | |
1837 | ||
1838 | return 0; | |
1839 | ||
1840 | out2: | |
1841 | unregister_pernet_device(&vxlan_net_ops); | |
1842 | out1: | |
758c57d1 | 1843 | destroy_workqueue(vxlan_wq); |
d342894c | 1844 | return rc; |
1845 | } | |
7332a13b | 1846 | late_initcall(vxlan_init_module); |
d342894c | 1847 | |
1848 | static void __exit vxlan_cleanup_module(void) | |
1849 | { | |
d342894c | 1850 | unregister_pernet_device(&vxlan_net_ops); |
b7153984 | 1851 | rtnl_link_unregister(&vxlan_link_ops); |
758c57d1 | 1852 | destroy_workqueue(vxlan_wq); |
6681712d | 1853 | rcu_barrier(); |
d342894c | 1854 | } |
1855 | module_exit(vxlan_cleanup_module); | |
1856 | ||
1857 | MODULE_LICENSE("GPL"); | |
1858 | MODULE_VERSION(VXLAN_VERSION); | |
3b8df3c6 | 1859 | MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); |
d342894c | 1860 | MODULE_ALIAS_RTNL_LINK("vxlan"); |