]>
Commit | Line | Data |
---|---|---|
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 | |
83 | /* per UDP socket information */ | |
84 | struct vxlan_sock { | |
85 | struct hlist_node hlist; | |
86 | struct rcu_head rcu; | |
87 | struct work_struct del_work; | |
7c47cedf | 88 | atomic_t refcnt; |
553675fb | 89 | struct socket *sock; |
d342894c | 90 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
91 | }; | |
92 | ||
553675fb | 93 | /* per-network namespace private data for this module */ |
94 | struct vxlan_net { | |
95 | struct list_head vxlan_list; | |
96 | struct hlist_head sock_list[PORT_HASH_SIZE]; | |
1c51a915 | 97 | spinlock_t sock_lock; |
553675fb | 98 | }; |
99 | ||
6681712d | 100 | struct vxlan_rdst { |
6681712d DS |
101 | __be32 remote_ip; |
102 | __be16 remote_port; | |
103 | u32 remote_vni; | |
104 | u32 remote_ifindex; | |
3e61aa8f | 105 | struct list_head list; |
6681712d DS |
106 | }; |
107 | ||
d342894c | 108 | /* Forwarding table entry */ |
109 | struct vxlan_fdb { | |
110 | struct hlist_node hlist; /* linked list of entries */ | |
111 | struct rcu_head rcu; | |
112 | unsigned long updated; /* jiffies */ | |
113 | unsigned long used; | |
3e61aa8f | 114 | struct list_head remotes; |
d342894c | 115 | u16 state; /* see ndm_state */ |
ae884082 | 116 | u8 flags; /* see ndm_flags */ |
d342894c | 117 | u8 eth_addr[ETH_ALEN]; |
118 | }; | |
119 | ||
d342894c | 120 | /* Pseudo network device */ |
121 | struct vxlan_dev { | |
553675fb | 122 | struct hlist_node hlist; /* vni hash table */ |
123 | struct list_head next; /* vxlan's per namespace list */ | |
124 | struct vxlan_sock *vn_sock; /* listening socket */ | |
d342894c | 125 | struct net_device *dev; |
c7995c43 | 126 | struct vxlan_rdst default_dst; /* default destination */ |
d342894c | 127 | __be32 saddr; /* source address */ |
823aa873 | 128 | __be16 dst_port; |
05f47d69 | 129 | __u16 port_min; /* source port range */ |
130 | __u16 port_max; | |
d342894c | 131 | __u8 tos; /* TOS override */ |
132 | __u8 ttl; | |
e4f67add | 133 | u32 flags; /* VXLAN_F_* below */ |
d342894c | 134 | |
1c51a915 | 135 | struct work_struct sock_work; |
7c47cedf | 136 | struct work_struct igmp_work; |
1c51a915 | 137 | |
d342894c | 138 | unsigned long age_interval; |
139 | struct timer_list age_timer; | |
140 | spinlock_t hash_lock; | |
141 | unsigned int addrcnt; | |
142 | unsigned int addrmax; | |
d342894c | 143 | |
144 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
145 | }; | |
146 | ||
e4f67add DS |
147 | #define VXLAN_F_LEARN 0x01 |
148 | #define VXLAN_F_PROXY 0x02 | |
149 | #define VXLAN_F_RSC 0x04 | |
150 | #define VXLAN_F_L2MISS 0x08 | |
151 | #define VXLAN_F_L3MISS 0x10 | |
152 | ||
d342894c | 153 | /* salt for hash table */ |
154 | static u32 vxlan_salt __read_mostly; | |
758c57d1 | 155 | static struct workqueue_struct *vxlan_wq; |
d342894c | 156 | |
1c51a915 SH |
157 | static void vxlan_sock_work(struct work_struct *work); |
158 | ||
553675fb | 159 | /* Virtual Network hash table head */ |
160 | static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id) | |
161 | { | |
162 | return &vs->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
163 | } | |
164 | ||
165 | /* Socket hash table head */ | |
166 | static inline struct hlist_head *vs_head(struct net *net, __be16 port) | |
d342894c | 167 | { |
168 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
169 | ||
553675fb | 170 | return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; |
171 | } | |
172 | ||
3e61aa8f SH |
173 | /* First remote destination for a forwarding entry. |
174 | * Guaranteed to be non-NULL because remotes are never deleted. | |
175 | */ | |
176 | static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb) | |
177 | { | |
178 | return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list); | |
179 | } | |
180 | ||
553675fb | 181 | /* Find VXLAN socket based on network namespace and UDP port */ |
182 | static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port) | |
183 | { | |
184 | struct vxlan_sock *vs; | |
185 | ||
186 | hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { | |
187 | if (inet_sk(vs->sock->sk)->inet_sport == port) | |
188 | return vs; | |
189 | } | |
190 | return NULL; | |
d342894c | 191 | } |
192 | ||
193 | /* Look up VNI in a per net namespace table */ | |
553675fb | 194 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port) |
d342894c | 195 | { |
553675fb | 196 | struct vxlan_sock *vs; |
d342894c | 197 | struct vxlan_dev *vxlan; |
d342894c | 198 | |
553675fb | 199 | vs = vxlan_find_port(net, port); |
200 | if (!vs) | |
201 | return NULL; | |
202 | ||
203 | hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) { | |
c7995c43 | 204 | if (vxlan->default_dst.remote_vni == id) |
d342894c | 205 | return vxlan; |
206 | } | |
207 | ||
208 | return NULL; | |
209 | } | |
210 | ||
211 | /* Fill in neighbour message in skbuff. */ | |
212 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
234f5b73 SH |
213 | const struct vxlan_fdb *fdb, |
214 | u32 portid, u32 seq, int type, unsigned int flags, | |
215 | const struct vxlan_rdst *rdst) | |
d342894c | 216 | { |
217 | unsigned long now = jiffies; | |
218 | struct nda_cacheinfo ci; | |
219 | struct nlmsghdr *nlh; | |
220 | struct ndmsg *ndm; | |
e4f67add | 221 | bool send_ip, send_eth; |
d342894c | 222 | |
223 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
224 | if (nlh == NULL) | |
225 | return -EMSGSIZE; | |
226 | ||
227 | ndm = nlmsg_data(nlh); | |
228 | memset(ndm, 0, sizeof(*ndm)); | |
e4f67add DS |
229 | |
230 | send_eth = send_ip = true; | |
231 | ||
232 | if (type == RTM_GETNEIGH) { | |
233 | ndm->ndm_family = AF_INET; | |
6681712d | 234 | send_ip = rdst->remote_ip != htonl(INADDR_ANY); |
e4f67add DS |
235 | send_eth = !is_zero_ether_addr(fdb->eth_addr); |
236 | } else | |
237 | ndm->ndm_family = AF_BRIDGE; | |
d342894c | 238 | ndm->ndm_state = fdb->state; |
239 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
ae884082 | 240 | ndm->ndm_flags = fdb->flags; |
d342894c | 241 | ndm->ndm_type = NDA_DST; |
242 | ||
e4f67add | 243 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
d342894c | 244 | goto nla_put_failure; |
245 | ||
6681712d DS |
246 | if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip)) |
247 | goto nla_put_failure; | |
248 | ||
823aa873 | 249 | if (rdst->remote_port && rdst->remote_port != vxlan->dst_port && |
6681712d DS |
250 | nla_put_be16(skb, NDA_PORT, rdst->remote_port)) |
251 | goto nla_put_failure; | |
c7995c43 | 252 | if (rdst->remote_vni != vxlan->default_dst.remote_vni && |
60d9d4c6 | 253 | nla_put_u32(skb, NDA_VNI, rdst->remote_vni)) |
6681712d DS |
254 | goto nla_put_failure; |
255 | if (rdst->remote_ifindex && | |
256 | nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) | |
d342894c | 257 | goto nla_put_failure; |
258 | ||
259 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
260 | ci.ndm_confirmed = 0; | |
261 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
262 | ci.ndm_refcnt = 0; | |
263 | ||
264 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
265 | goto nla_put_failure; | |
266 | ||
267 | return nlmsg_end(skb, nlh); | |
268 | ||
269 | nla_put_failure: | |
270 | nlmsg_cancel(skb, nlh); | |
271 | return -EMSGSIZE; | |
272 | } | |
273 | ||
274 | static inline size_t vxlan_nlmsg_size(void) | |
275 | { | |
276 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
277 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
278 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
73cf3317 | 279 | + nla_total_size(sizeof(__be16)) /* NDA_PORT */ |
6681712d DS |
280 | + nla_total_size(sizeof(__be32)) /* NDA_VNI */ |
281 | + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ | |
d342894c | 282 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
283 | } | |
284 | ||
285 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
3e61aa8f | 286 | struct vxlan_fdb *fdb, int type) |
d342894c | 287 | { |
288 | struct net *net = dev_net(vxlan->dev); | |
289 | struct sk_buff *skb; | |
290 | int err = -ENOBUFS; | |
291 | ||
292 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
293 | if (skb == NULL) | |
294 | goto errout; | |
295 | ||
3e61aa8f | 296 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb)); |
d342894c | 297 | if (err < 0) { |
298 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
299 | WARN_ON(err == -EMSGSIZE); | |
300 | kfree_skb(skb); | |
301 | goto errout; | |
302 | } | |
303 | ||
304 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
305 | return; | |
306 | errout: | |
307 | if (err < 0) | |
308 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
309 | } | |
310 | ||
e4f67add DS |
311 | static void vxlan_ip_miss(struct net_device *dev, __be32 ipa) |
312 | { | |
313 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
bb3fd687 SH |
314 | struct vxlan_fdb f = { |
315 | .state = NUD_STALE, | |
316 | }; | |
317 | struct vxlan_rdst remote = { | |
318 | .remote_ip = ipa, /* goes to NDA_DST */ | |
319 | .remote_vni = VXLAN_N_VID, | |
320 | }; | |
3e61aa8f SH |
321 | |
322 | INIT_LIST_HEAD(&f.remotes); | |
323 | list_add_rcu(&remote.list, &f.remotes); | |
e4f67add DS |
324 | |
325 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
326 | } | |
327 | ||
328 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
329 | { | |
bb3fd687 SH |
330 | struct vxlan_fdb f = { |
331 | .state = NUD_STALE, | |
332 | }; | |
e4f67add | 333 | |
3e61aa8f | 334 | INIT_LIST_HEAD(&f.remotes); |
e4f67add DS |
335 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); |
336 | ||
337 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
338 | } | |
339 | ||
d342894c | 340 | /* Hash Ethernet address */ |
341 | static u32 eth_hash(const unsigned char *addr) | |
342 | { | |
343 | u64 value = get_unaligned((u64 *)addr); | |
344 | ||
345 | /* only want 6 bytes */ | |
346 | #ifdef __BIG_ENDIAN | |
d342894c | 347 | value >>= 16; |
321fb991 | 348 | #else |
349 | value <<= 16; | |
d342894c | 350 | #endif |
351 | return hash_64(value, FDB_HASH_BITS); | |
352 | } | |
353 | ||
354 | /* Hash chain to use given mac address */ | |
355 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
356 | const u8 *mac) | |
357 | { | |
358 | return &vxlan->fdb_head[eth_hash(mac)]; | |
359 | } | |
360 | ||
361 | /* Look up Ethernet address in forwarding table */ | |
014be2c8 | 362 | static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, |
d342894c | 363 | const u8 *mac) |
364 | ||
365 | { | |
366 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
367 | struct vxlan_fdb *f; | |
d342894c | 368 | |
b67bfe0d | 369 | hlist_for_each_entry_rcu(f, head, hlist) { |
d342894c | 370 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
371 | return f; | |
372 | } | |
373 | ||
374 | return NULL; | |
375 | } | |
376 | ||
014be2c8 SS |
377 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, |
378 | const u8 *mac) | |
379 | { | |
380 | struct vxlan_fdb *f; | |
381 | ||
382 | f = __vxlan_find_mac(vxlan, mac); | |
383 | if (f) | |
384 | f->used = jiffies; | |
385 | ||
386 | return f; | |
387 | } | |
388 | ||
6681712d DS |
389 | /* Add/update destinations for multicast */ |
390 | static int vxlan_fdb_append(struct vxlan_fdb *f, | |
73cf3317 | 391 | __be32 ip, __be16 port, __u32 vni, __u32 ifindex) |
6681712d | 392 | { |
3e61aa8f | 393 | struct vxlan_rdst *rd; |
6681712d | 394 | |
3e61aa8f SH |
395 | /* protected by vxlan->hash_lock */ |
396 | list_for_each_entry(rd, &f->remotes, list) { | |
6681712d DS |
397 | if (rd->remote_ip == ip && |
398 | rd->remote_port == port && | |
399 | rd->remote_vni == vni && | |
400 | rd->remote_ifindex == ifindex) | |
401 | return 0; | |
6681712d | 402 | } |
3e61aa8f | 403 | |
6681712d DS |
404 | rd = kmalloc(sizeof(*rd), GFP_ATOMIC); |
405 | if (rd == NULL) | |
406 | return -ENOBUFS; | |
407 | rd->remote_ip = ip; | |
408 | rd->remote_port = port; | |
409 | rd->remote_vni = vni; | |
410 | rd->remote_ifindex = ifindex; | |
3e61aa8f SH |
411 | |
412 | list_add_tail_rcu(&rd->list, &f->remotes); | |
413 | ||
6681712d DS |
414 | return 1; |
415 | } | |
416 | ||
d342894c | 417 | /* Add new entry to forwarding table -- assumes lock held */ |
418 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
419 | const u8 *mac, __be32 ip, | |
6681712d | 420 | __u16 state, __u16 flags, |
73cf3317 | 421 | __be16 port, __u32 vni, __u32 ifindex, |
ae884082 | 422 | __u8 ndm_flags) |
d342894c | 423 | { |
424 | struct vxlan_fdb *f; | |
425 | int notify = 0; | |
426 | ||
014be2c8 | 427 | f = __vxlan_find_mac(vxlan, mac); |
d342894c | 428 | if (f) { |
429 | if (flags & NLM_F_EXCL) { | |
430 | netdev_dbg(vxlan->dev, | |
431 | "lost race to create %pM\n", mac); | |
432 | return -EEXIST; | |
433 | } | |
434 | if (f->state != state) { | |
435 | f->state = state; | |
436 | f->updated = jiffies; | |
437 | notify = 1; | |
438 | } | |
ae884082 DS |
439 | if (f->flags != ndm_flags) { |
440 | f->flags = ndm_flags; | |
441 | f->updated = jiffies; | |
442 | notify = 1; | |
443 | } | |
6681712d DS |
444 | if ((flags & NLM_F_APPEND) && |
445 | is_multicast_ether_addr(f->eth_addr)) { | |
446 | int rc = vxlan_fdb_append(f, ip, port, vni, ifindex); | |
447 | ||
448 | if (rc < 0) | |
449 | return rc; | |
450 | notify |= rc; | |
451 | } | |
d342894c | 452 | } else { |
453 | if (!(flags & NLM_F_CREATE)) | |
454 | return -ENOENT; | |
455 | ||
456 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
457 | return -ENOSPC; | |
458 | ||
459 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
460 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
461 | if (!f) | |
462 | return -ENOMEM; | |
463 | ||
464 | notify = 1; | |
d342894c | 465 | f->state = state; |
ae884082 | 466 | f->flags = ndm_flags; |
d342894c | 467 | f->updated = f->used = jiffies; |
3e61aa8f | 468 | INIT_LIST_HEAD(&f->remotes); |
d342894c | 469 | memcpy(f->eth_addr, mac, ETH_ALEN); |
470 | ||
3e61aa8f SH |
471 | vxlan_fdb_append(f, ip, port, vni, ifindex); |
472 | ||
d342894c | 473 | ++vxlan->addrcnt; |
474 | hlist_add_head_rcu(&f->hlist, | |
475 | vxlan_fdb_head(vxlan, mac)); | |
476 | } | |
477 | ||
478 | if (notify) | |
479 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
6706c82e | 484 | static void vxlan_fdb_free(struct rcu_head *head) |
6681712d DS |
485 | { |
486 | struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); | |
3e61aa8f | 487 | struct vxlan_rdst *rd, *nd; |
6681712d | 488 | |
3e61aa8f | 489 | list_for_each_entry_safe(rd, nd, &f->remotes, list) |
6681712d | 490 | kfree(rd); |
6681712d DS |
491 | kfree(f); |
492 | } | |
493 | ||
d342894c | 494 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
495 | { | |
496 | netdev_dbg(vxlan->dev, | |
497 | "delete %pM\n", f->eth_addr); | |
498 | ||
499 | --vxlan->addrcnt; | |
500 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
501 | ||
502 | hlist_del_rcu(&f->hlist); | |
6681712d | 503 | call_rcu(&f->rcu, vxlan_fdb_free); |
d342894c | 504 | } |
505 | ||
506 | /* Add static entry (via netlink) */ | |
507 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
508 | struct net_device *dev, | |
509 | const unsigned char *addr, u16 flags) | |
510 | { | |
511 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
6681712d | 512 | struct net *net = dev_net(vxlan->dev); |
d342894c | 513 | __be32 ip; |
73cf3317 | 514 | __be16 port; |
515 | u32 vni, ifindex; | |
d342894c | 516 | int err; |
517 | ||
518 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
519 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
520 | ndm->ndm_state); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | if (tb[NDA_DST] == NULL) | |
525 | return -EINVAL; | |
526 | ||
527 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
528 | return -EAFNOSUPPORT; | |
529 | ||
530 | ip = nla_get_be32(tb[NDA_DST]); | |
531 | ||
6681712d | 532 | if (tb[NDA_PORT]) { |
73cf3317 | 533 | if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) |
6681712d | 534 | return -EINVAL; |
73cf3317 | 535 | port = nla_get_be16(tb[NDA_PORT]); |
6681712d | 536 | } else |
823aa873 | 537 | port = vxlan->dst_port; |
6681712d DS |
538 | |
539 | if (tb[NDA_VNI]) { | |
540 | if (nla_len(tb[NDA_VNI]) != sizeof(u32)) | |
541 | return -EINVAL; | |
542 | vni = nla_get_u32(tb[NDA_VNI]); | |
543 | } else | |
c7995c43 | 544 | vni = vxlan->default_dst.remote_vni; |
6681712d DS |
545 | |
546 | if (tb[NDA_IFINDEX]) { | |
5abb0029 | 547 | struct net_device *tdev; |
6681712d DS |
548 | |
549 | if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) | |
550 | return -EINVAL; | |
551 | ifindex = nla_get_u32(tb[NDA_IFINDEX]); | |
5abb0029 PS |
552 | tdev = dev_get_by_index(net, ifindex); |
553 | if (!tdev) | |
6681712d | 554 | return -EADDRNOTAVAIL; |
5abb0029 | 555 | dev_put(tdev); |
6681712d DS |
556 | } else |
557 | ifindex = 0; | |
558 | ||
d342894c | 559 | spin_lock_bh(&vxlan->hash_lock); |
73cf3317 | 560 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags, |
561 | port, vni, ifindex, ndm->ndm_flags); | |
d342894c | 562 | spin_unlock_bh(&vxlan->hash_lock); |
563 | ||
564 | return err; | |
565 | } | |
566 | ||
567 | /* Delete entry (via netlink) */ | |
1690be63 VY |
568 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
569 | struct net_device *dev, | |
d342894c | 570 | const unsigned char *addr) |
571 | { | |
572 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
573 | struct vxlan_fdb *f; | |
574 | int err = -ENOENT; | |
575 | ||
576 | spin_lock_bh(&vxlan->hash_lock); | |
577 | f = vxlan_find_mac(vxlan, addr); | |
578 | if (f) { | |
579 | vxlan_fdb_destroy(vxlan, f); | |
580 | err = 0; | |
581 | } | |
582 | spin_unlock_bh(&vxlan->hash_lock); | |
583 | ||
584 | return err; | |
585 | } | |
586 | ||
587 | /* Dump forwarding table */ | |
588 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
589 | struct net_device *dev, int idx) | |
590 | { | |
591 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
592 | unsigned int h; | |
593 | ||
594 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
595 | struct vxlan_fdb *f; | |
d342894c | 596 | int err; |
597 | ||
b67bfe0d | 598 | hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
6681712d | 599 | struct vxlan_rdst *rd; |
6681712d | 600 | |
3e61aa8f SH |
601 | if (idx < cb->args[0]) |
602 | goto skip; | |
603 | ||
604 | list_for_each_entry_rcu(rd, &f->remotes, list) { | |
6681712d DS |
605 | err = vxlan_fdb_info(skb, vxlan, f, |
606 | NETLINK_CB(cb->skb).portid, | |
607 | cb->nlh->nlmsg_seq, | |
608 | RTM_NEWNEIGH, | |
609 | NLM_F_MULTI, rd); | |
610 | if (err < 0) | |
3e61aa8f | 611 | goto out; |
6681712d | 612 | } |
3e61aa8f SH |
613 | skip: |
614 | ++idx; | |
d342894c | 615 | } |
616 | } | |
3e61aa8f | 617 | out: |
d342894c | 618 | return idx; |
619 | } | |
620 | ||
621 | /* Watch incoming packets to learn mapping between Ethernet address | |
622 | * and Tunnel endpoint. | |
26a41ae6 | 623 | * Return true if packet is bogus and should be droppped. |
d342894c | 624 | */ |
26a41ae6 | 625 | static bool vxlan_snoop(struct net_device *dev, |
d342894c | 626 | __be32 src_ip, const u8 *src_mac) |
627 | { | |
628 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
629 | struct vxlan_fdb *f; | |
d342894c | 630 | |
631 | f = vxlan_find_mac(vxlan, src_mac); | |
632 | if (likely(f)) { | |
3e61aa8f SH |
633 | struct vxlan_rdst *rdst = first_remote(f); |
634 | ||
635 | if (likely(rdst->remote_ip == src_ip)) | |
26a41ae6 | 636 | return false; |
637 | ||
638 | /* Don't migrate static entries, drop packets */ | |
eb064c3b | 639 | if (f->state & NUD_NOARP) |
26a41ae6 | 640 | return true; |
d342894c | 641 | |
642 | if (net_ratelimit()) | |
643 | netdev_info(dev, | |
644 | "%pM migrated from %pI4 to %pI4\n", | |
3e61aa8f | 645 | src_mac, &rdst->remote_ip, &src_ip); |
d342894c | 646 | |
3e61aa8f | 647 | rdst->remote_ip = src_ip; |
d342894c | 648 | f->updated = jiffies; |
8385f50a | 649 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); |
d342894c | 650 | } else { |
651 | /* learned new entry */ | |
652 | spin_lock(&vxlan->hash_lock); | |
3bf74b1a | 653 | |
654 | /* close off race between vxlan_flush and incoming packets */ | |
655 | if (netif_running(dev)) | |
656 | vxlan_fdb_create(vxlan, src_mac, src_ip, | |
657 | NUD_REACHABLE, | |
658 | NLM_F_EXCL|NLM_F_CREATE, | |
659 | vxlan->dst_port, | |
660 | vxlan->default_dst.remote_vni, | |
661 | 0, NTF_SELF); | |
d342894c | 662 | spin_unlock(&vxlan->hash_lock); |
663 | } | |
26a41ae6 | 664 | |
665 | return false; | |
d342894c | 666 | } |
667 | ||
668 | ||
669 | /* See if multicast group is already in use by other ID */ | |
7c47cedf | 670 | static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip) |
d342894c | 671 | { |
553675fb | 672 | struct vxlan_dev *vxlan; |
d342894c | 673 | |
553675fb | 674 | list_for_each_entry(vxlan, &vn->vxlan_list, next) { |
553675fb | 675 | if (!netif_running(vxlan->dev)) |
676 | continue; | |
d342894c | 677 | |
7c47cedf | 678 | if (vxlan->default_dst.remote_ip == remote_ip) |
553675fb | 679 | return true; |
680 | } | |
d342894c | 681 | |
682 | return false; | |
683 | } | |
684 | ||
7c47cedf | 685 | static void vxlan_sock_hold(struct vxlan_sock *vs) |
d342894c | 686 | { |
7c47cedf SH |
687 | atomic_inc(&vs->refcnt); |
688 | } | |
d342894c | 689 | |
1c51a915 | 690 | static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs) |
7c47cedf SH |
691 | { |
692 | if (!atomic_dec_and_test(&vs->refcnt)) | |
693 | return; | |
d342894c | 694 | |
1c51a915 | 695 | spin_lock(&vn->sock_lock); |
7c47cedf | 696 | hlist_del_rcu(&vs->hlist); |
1c51a915 SH |
697 | spin_unlock(&vn->sock_lock); |
698 | ||
7c47cedf | 699 | queue_work(vxlan_wq, &vs->del_work); |
d342894c | 700 | } |
701 | ||
7c47cedf SH |
702 | /* Callback to update multicast group membership. |
703 | * Scheduled when vxlan goes up/down. | |
704 | */ | |
705 | static void vxlan_igmp_work(struct work_struct *work) | |
d342894c | 706 | { |
7c47cedf SH |
707 | struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work); |
708 | struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id); | |
709 | struct vxlan_sock *vs = vxlan->vn_sock; | |
710 | struct sock *sk = vs->sock->sk; | |
d342894c | 711 | struct ip_mreqn mreq = { |
c7995c43 AW |
712 | .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, |
713 | .imr_ifindex = vxlan->default_dst.remote_ifindex, | |
d342894c | 714 | }; |
715 | ||
d342894c | 716 | lock_sock(sk); |
7c47cedf SH |
717 | if (vxlan_group_used(vn, vxlan->default_dst.remote_ip)) |
718 | ip_mc_join_group(sk, &mreq); | |
719 | else | |
720 | ip_mc_leave_group(sk, &mreq); | |
d342894c | 721 | release_sock(sk); |
d342894c | 722 | |
1c51a915 | 723 | vxlan_sock_release(vn, vs); |
7c47cedf | 724 | dev_put(vxlan->dev); |
d342894c | 725 | } |
726 | ||
727 | /* Callback from net/ipv4/udp.c to receive packets */ | |
728 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
729 | { | |
730 | struct iphdr *oip; | |
731 | struct vxlanhdr *vxh; | |
732 | struct vxlan_dev *vxlan; | |
e8171045 | 733 | struct pcpu_tstats *stats; |
553675fb | 734 | __be16 port; |
d342894c | 735 | __u32 vni; |
736 | int err; | |
737 | ||
738 | /* pop off outer UDP header */ | |
739 | __skb_pull(skb, sizeof(struct udphdr)); | |
740 | ||
741 | /* Need Vxlan and inner Ethernet header to be present */ | |
742 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
743 | goto error; | |
744 | ||
745 | /* Drop packets with reserved bits set */ | |
746 | vxh = (struct vxlanhdr *) skb->data; | |
747 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
748 | (vxh->vx_vni & htonl(0xff))) { | |
749 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
750 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
751 | goto error; | |
752 | } | |
753 | ||
754 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 755 | |
756 | /* Is this VNI defined? */ | |
757 | vni = ntohl(vxh->vx_vni) >> 8; | |
553675fb | 758 | port = inet_sk(sk)->inet_sport; |
759 | vxlan = vxlan_find_vni(sock_net(sk), vni, port); | |
d342894c | 760 | if (!vxlan) { |
553675fb | 761 | netdev_dbg(skb->dev, "unknown vni %d port %u\n", |
762 | vni, ntohs(port)); | |
d342894c | 763 | goto drop; |
764 | } | |
765 | ||
766 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
767 | vxlan->dev->stats.rx_length_errors++; | |
768 | vxlan->dev->stats.rx_errors++; | |
769 | goto drop; | |
770 | } | |
771 | ||
e4f67add DS |
772 | skb_reset_mac_header(skb); |
773 | ||
d342894c | 774 | /* Re-examine inner Ethernet packet */ |
775 | oip = ip_hdr(skb); | |
776 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 777 | |
778 | /* Ignore packet loops (and multicast echo) */ | |
779 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
780 | vxlan->dev->dev_addr) == 0) | |
781 | goto drop; | |
782 | ||
26a41ae6 | 783 | if ((vxlan->flags & VXLAN_F_LEARN) && |
784 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source)) | |
785 | goto drop; | |
d342894c | 786 | |
787 | __skb_tunnel_rx(skb, vxlan->dev); | |
788 | skb_reset_network_header(skb); | |
0afb1666 JG |
789 | |
790 | /* If the NIC driver gave us an encapsulated packet with | |
791 | * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, | |
792 | * leave the CHECKSUM_UNNECESSARY, the device checksummed it | |
793 | * for us. Otherwise force the upper layers to verify it. | |
794 | */ | |
795 | if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || | |
796 | !(vxlan->dev->features & NETIF_F_RXCSUM)) | |
797 | skb->ip_summed = CHECKSUM_NONE; | |
798 | ||
799 | skb->encapsulation = 0; | |
d342894c | 800 | |
801 | err = IP_ECN_decapsulate(oip, skb); | |
802 | if (unlikely(err)) { | |
803 | if (log_ecn_error) | |
804 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
805 | &oip->saddr, oip->tos); | |
806 | if (err > 1) { | |
807 | ++vxlan->dev->stats.rx_frame_errors; | |
808 | ++vxlan->dev->stats.rx_errors; | |
809 | goto drop; | |
810 | } | |
811 | } | |
812 | ||
e8171045 | 813 | stats = this_cpu_ptr(vxlan->dev->tstats); |
d342894c | 814 | u64_stats_update_begin(&stats->syncp); |
815 | stats->rx_packets++; | |
816 | stats->rx_bytes += skb->len; | |
817 | u64_stats_update_end(&stats->syncp); | |
818 | ||
819 | netif_rx(skb); | |
820 | ||
821 | return 0; | |
822 | error: | |
823 | /* Put UDP header back */ | |
824 | __skb_push(skb, sizeof(struct udphdr)); | |
825 | ||
826 | return 1; | |
827 | drop: | |
828 | /* Consume bad packet */ | |
829 | kfree_skb(skb); | |
830 | return 0; | |
831 | } | |
832 | ||
e4f67add DS |
833 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
834 | { | |
835 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
836 | struct arphdr *parp; | |
837 | u8 *arpptr, *sha; | |
838 | __be32 sip, tip; | |
839 | struct neighbour *n; | |
840 | ||
841 | if (dev->flags & IFF_NOARP) | |
842 | goto out; | |
843 | ||
844 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
845 | dev->stats.tx_dropped++; | |
846 | goto out; | |
847 | } | |
848 | parp = arp_hdr(skb); | |
849 | ||
850 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
851 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
852 | parp->ar_pro != htons(ETH_P_IP) || | |
853 | parp->ar_op != htons(ARPOP_REQUEST) || | |
854 | parp->ar_hln != dev->addr_len || | |
855 | parp->ar_pln != 4) | |
856 | goto out; | |
857 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
858 | sha = arpptr; | |
859 | arpptr += dev->addr_len; /* sha */ | |
860 | memcpy(&sip, arpptr, sizeof(sip)); | |
861 | arpptr += sizeof(sip); | |
862 | arpptr += dev->addr_len; /* tha */ | |
863 | memcpy(&tip, arpptr, sizeof(tip)); | |
864 | ||
865 | if (ipv4_is_loopback(tip) || | |
866 | ipv4_is_multicast(tip)) | |
867 | goto out; | |
868 | ||
869 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
870 | ||
871 | if (n) { | |
e4f67add DS |
872 | struct vxlan_fdb *f; |
873 | struct sk_buff *reply; | |
874 | ||
875 | if (!(n->nud_state & NUD_CONNECTED)) { | |
876 | neigh_release(n); | |
877 | goto out; | |
878 | } | |
879 | ||
880 | f = vxlan_find_mac(vxlan, n->ha); | |
3e61aa8f | 881 | if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) { |
e4f67add DS |
882 | /* bridge-local neighbor */ |
883 | neigh_release(n); | |
884 | goto out; | |
885 | } | |
886 | ||
887 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
888 | n->ha, sha); | |
889 | ||
890 | neigh_release(n); | |
891 | ||
892 | skb_reset_mac_header(reply); | |
893 | __skb_pull(reply, skb_network_offset(reply)); | |
894 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
895 | reply->pkt_type = PACKET_HOST; | |
896 | ||
897 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
898 | dev->stats.rx_dropped++; | |
899 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
900 | vxlan_ip_miss(dev, tip); | |
901 | out: | |
902 | consume_skb(skb); | |
903 | return NETDEV_TX_OK; | |
904 | } | |
905 | ||
906 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
907 | { | |
908 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
909 | struct neighbour *n; | |
910 | struct iphdr *pip; | |
911 | ||
912 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
913 | return false; | |
914 | ||
915 | n = NULL; | |
916 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
917 | case ETH_P_IP: | |
918 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
919 | return false; | |
920 | pip = ip_hdr(skb); | |
921 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
922 | break; | |
923 | default: | |
924 | return false; | |
925 | } | |
926 | ||
927 | if (n) { | |
928 | bool diff; | |
929 | ||
930 | diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; | |
931 | if (diff) { | |
932 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
933 | dev->addr_len); | |
934 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
935 | } | |
936 | neigh_release(n); | |
937 | return diff; | |
938 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
939 | vxlan_ip_miss(dev, pip->daddr); | |
940 | return false; | |
941 | } | |
942 | ||
553675fb | 943 | static void vxlan_sock_put(struct sk_buff *skb) |
1cad8715 | 944 | { |
945 | sock_put(skb->sk); | |
946 | } | |
947 | ||
948 | /* On transmit, associate with the tunnel socket */ | |
949 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
950 | { | |
553675fb | 951 | struct vxlan_dev *vxlan = netdev_priv(dev); |
952 | struct sock *sk = vxlan->vn_sock->sock->sk; | |
1cad8715 | 953 | |
954 | skb_orphan(skb); | |
955 | sock_hold(sk); | |
956 | skb->sk = sk; | |
553675fb | 957 | skb->destructor = vxlan_sock_put; |
1cad8715 | 958 | } |
959 | ||
05f47d69 | 960 | /* Compute source port for outgoing packet |
961 | * first choice to use L4 flow hash since it will spread | |
962 | * better and maybe available from hardware | |
963 | * secondary choice is to use jhash on the Ethernet header | |
964 | */ | |
7d836a76 | 965 | static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) |
05f47d69 | 966 | { |
967 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
968 | u32 hash; | |
969 | ||
970 | hash = skb_get_rxhash(skb); | |
971 | if (!hash) | |
972 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
973 | (__force u32) skb->protocol); | |
974 | ||
7d836a76 | 975 | return htons((((u64) hash * range) >> 32) + vxlan->port_min); |
05f47d69 | 976 | } |
977 | ||
05c0db08 PS |
978 | static int handle_offloads(struct sk_buff *skb) |
979 | { | |
980 | if (skb_is_gso(skb)) { | |
981 | int err = skb_unclone(skb, GFP_ATOMIC); | |
982 | if (unlikely(err)) | |
983 | return err; | |
984 | ||
f6ace502 | 985 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; |
05c0db08 PS |
986 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) |
987 | skb->ip_summed = CHECKSUM_NONE; | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
9dcc71e1 SS |
992 | /* Bypass encapsulation if the destination is local */ |
993 | static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, | |
994 | struct vxlan_dev *dst_vxlan) | |
995 | { | |
996 | struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); | |
997 | struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); | |
998 | ||
999 | skb->pkt_type = PACKET_HOST; | |
1000 | skb->encapsulation = 0; | |
1001 | skb->dev = dst_vxlan->dev; | |
1002 | __skb_pull(skb, skb_network_offset(skb)); | |
1003 | ||
1004 | if (dst_vxlan->flags & VXLAN_F_LEARN) | |
9d9f163c MR |
1005 | vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK), |
1006 | eth_hdr(skb)->h_source); | |
9dcc71e1 SS |
1007 | |
1008 | u64_stats_update_begin(&tx_stats->syncp); | |
1009 | tx_stats->tx_packets++; | |
1010 | tx_stats->tx_bytes += skb->len; | |
1011 | u64_stats_update_end(&tx_stats->syncp); | |
1012 | ||
1013 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
1014 | u64_stats_update_begin(&rx_stats->syncp); | |
1015 | rx_stats->rx_packets++; | |
1016 | rx_stats->rx_bytes += skb->len; | |
1017 | u64_stats_update_end(&rx_stats->syncp); | |
1018 | } else { | |
1019 | skb->dev->stats.rx_dropped++; | |
1020 | } | |
1021 | } | |
1022 | ||
4ad16930 SH |
1023 | static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
1024 | struct vxlan_rdst *rdst, bool did_rsc) | |
d342894c | 1025 | { |
1026 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1027 | struct rtable *rt; | |
d342894c | 1028 | const struct iphdr *old_iph; |
d342894c | 1029 | struct vxlanhdr *vxh; |
1030 | struct udphdr *uh; | |
1031 | struct flowi4 fl4; | |
d342894c | 1032 | __be32 dst; |
7d836a76 | 1033 | __be16 src_port, dst_port; |
234f5b73 | 1034 | u32 vni; |
d342894c | 1035 | __be16 df = 0; |
1036 | __u8 tos, ttl; | |
0e6fbc5b | 1037 | int err; |
d342894c | 1038 | |
823aa873 | 1039 | dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port; |
6681712d DS |
1040 | vni = rdst->remote_vni; |
1041 | dst = rdst->remote_ip; | |
e4f67add DS |
1042 | |
1043 | if (!dst) { | |
1044 | if (did_rsc) { | |
e4f67add | 1045 | /* short-circuited back to local bridge */ |
9dcc71e1 | 1046 | vxlan_encap_bypass(skb, vxlan, vxlan); |
4ad16930 | 1047 | return; |
e4f67add | 1048 | } |
ef59febe | 1049 | goto drop; |
e4f67add | 1050 | } |
ef59febe | 1051 | |
d6727fe3 JG |
1052 | if (!skb->encapsulation) { |
1053 | skb_reset_inner_headers(skb); | |
1054 | skb->encapsulation = 1; | |
1055 | } | |
1056 | ||
d342894c | 1057 | /* Need space for new headers (invalidates iph ptr) */ |
1058 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
1059 | goto drop; | |
1060 | ||
d342894c | 1061 | old_iph = ip_hdr(skb); |
1062 | ||
d342894c | 1063 | ttl = vxlan->ttl; |
1064 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
1065 | ttl = 1; | |
1066 | ||
1067 | tos = vxlan->tos; | |
1068 | if (tos == 1) | |
206aaafc | 1069 | tos = ip_tunnel_get_dsfield(old_iph, skb); |
d342894c | 1070 | |
05f47d69 | 1071 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 1072 | |
ca78f181 | 1073 | memset(&fl4, 0, sizeof(fl4)); |
6681712d | 1074 | fl4.flowi4_oif = rdst->remote_ifindex; |
ca78f181 | 1075 | fl4.flowi4_tos = RT_TOS(tos); |
1076 | fl4.daddr = dst; | |
1077 | fl4.saddr = vxlan->saddr; | |
1078 | ||
1079 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 1080 | if (IS_ERR(rt)) { |
1081 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
1082 | dev->stats.tx_carrier_errors++; | |
1083 | goto tx_error; | |
1084 | } | |
1085 | ||
1086 | if (rt->dst.dev == dev) { | |
1087 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
1088 | ip_rt_put(rt); | |
1089 | dev->stats.collisions++; | |
1090 | goto tx_error; | |
1091 | } | |
1092 | ||
9dcc71e1 | 1093 | /* Bypass encapsulation if the destination is local */ |
ab09a6d0 MR |
1094 | if (rt->rt_flags & RTCF_LOCAL && |
1095 | !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { | |
9dcc71e1 SS |
1096 | struct vxlan_dev *dst_vxlan; |
1097 | ||
1098 | ip_rt_put(rt); | |
553675fb | 1099 | dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port); |
9dcc71e1 SS |
1100 | if (!dst_vxlan) |
1101 | goto tx_error; | |
1102 | vxlan_encap_bypass(skb, vxlan, dst_vxlan); | |
4ad16930 | 1103 | return; |
9dcc71e1 | 1104 | } |
d342894c | 1105 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); |
1106 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
6681712d | 1107 | vxh->vx_vni = htonl(vni << 8); |
d342894c | 1108 | |
1109 | __skb_push(skb, sizeof(*uh)); | |
1110 | skb_reset_transport_header(skb); | |
1111 | uh = udp_hdr(skb); | |
1112 | ||
73cf3317 | 1113 | uh->dest = dst_port; |
7d836a76 | 1114 | uh->source = src_port; |
d342894c | 1115 | |
1116 | uh->len = htons(skb->len); | |
1117 | uh->check = 0; | |
1118 | ||
1cad8715 | 1119 | vxlan_set_owner(dev, skb); |
1120 | ||
05c0db08 PS |
1121 | if (handle_offloads(skb)) |
1122 | goto drop; | |
d342894c | 1123 | |
0e6fbc5b PS |
1124 | tos = ip_tunnel_ecn_encap(tos, old_iph, skb); |
1125 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
1126 | ||
1127 | err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst, | |
1128 | IPPROTO_UDP, tos, ttl, df); | |
1129 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); | |
1130 | ||
4ad16930 | 1131 | return; |
d342894c | 1132 | |
1133 | drop: | |
1134 | dev->stats.tx_dropped++; | |
1135 | goto tx_free; | |
1136 | ||
1137 | tx_error: | |
1138 | dev->stats.tx_errors++; | |
1139 | tx_free: | |
1140 | dev_kfree_skb(skb); | |
d342894c | 1141 | } |
1142 | ||
6681712d DS |
1143 | /* Transmit local packets over Vxlan |
1144 | * | |
1145 | * Outer IP header inherits ECN and DF from inner header. | |
1146 | * Outer UDP destination is the VXLAN assigned port. | |
1147 | * source port is based on hash of flow | |
1148 | */ | |
1149 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
1150 | { | |
1151 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1152 | struct ethhdr *eth; | |
1153 | bool did_rsc = false; | |
c7995c43 | 1154 | struct vxlan_rdst *rdst0, *rdst; |
6681712d | 1155 | struct vxlan_fdb *f; |
6681712d DS |
1156 | |
1157 | skb_reset_mac_header(skb); | |
1158 | eth = eth_hdr(skb); | |
1159 | ||
1160 | if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) | |
1161 | return arp_reduce(dev, skb); | |
6681712d DS |
1162 | |
1163 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
ae884082 DS |
1164 | did_rsc = false; |
1165 | ||
1166 | if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) && | |
1167 | ntohs(eth->h_proto) == ETH_P_IP) { | |
1168 | did_rsc = route_shortcircuit(dev, skb); | |
1169 | if (did_rsc) | |
1170 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
1171 | } | |
1172 | ||
6681712d | 1173 | if (f == NULL) { |
c7995c43 AW |
1174 | rdst0 = &vxlan->default_dst; |
1175 | ||
1176 | if (rdst0->remote_ip == htonl(INADDR_ANY) && | |
6681712d DS |
1177 | (vxlan->flags & VXLAN_F_L2MISS) && |
1178 | !is_multicast_ether_addr(eth->h_dest)) | |
1179 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
3e61aa8f SH |
1180 | } else { |
1181 | rdst = rdst0 = first_remote(f); | |
6681712d | 1182 | |
3e61aa8f SH |
1183 | /* if there are multiple destinations, send copies */ |
1184 | list_for_each_entry_continue_rcu(rdst, &f->remotes, list) { | |
1185 | struct sk_buff *skb1; | |
6681712d | 1186 | |
3e61aa8f SH |
1187 | skb1 = skb_clone(skb, GFP_ATOMIC); |
1188 | if (skb1) | |
1189 | vxlan_xmit_one(skb1, dev, rdst, did_rsc); | |
1190 | } | |
6681712d DS |
1191 | } |
1192 | ||
4ad16930 SH |
1193 | vxlan_xmit_one(skb, dev, rdst0, did_rsc); |
1194 | return NETDEV_TX_OK; | |
6681712d DS |
1195 | } |
1196 | ||
d342894c | 1197 | /* Walk the forwarding table and purge stale entries */ |
1198 | static void vxlan_cleanup(unsigned long arg) | |
1199 | { | |
1200 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
1201 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
1202 | unsigned int h; | |
1203 | ||
1204 | if (!netif_running(vxlan->dev)) | |
1205 | return; | |
1206 | ||
1207 | spin_lock_bh(&vxlan->hash_lock); | |
1208 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1209 | struct hlist_node *p, *n; | |
1210 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1211 | struct vxlan_fdb *f | |
1212 | = container_of(p, struct vxlan_fdb, hlist); | |
1213 | unsigned long timeout; | |
1214 | ||
3c172868 | 1215 | if (f->state & NUD_PERMANENT) |
d342894c | 1216 | continue; |
1217 | ||
1218 | timeout = f->used + vxlan->age_interval * HZ; | |
1219 | if (time_before_eq(timeout, jiffies)) { | |
1220 | netdev_dbg(vxlan->dev, | |
1221 | "garbage collect %pM\n", | |
1222 | f->eth_addr); | |
1223 | f->state = NUD_STALE; | |
1224 | vxlan_fdb_destroy(vxlan, f); | |
1225 | } else if (time_before(timeout, next_timer)) | |
1226 | next_timer = timeout; | |
1227 | } | |
1228 | } | |
1229 | spin_unlock_bh(&vxlan->hash_lock); | |
1230 | ||
1231 | mod_timer(&vxlan->age_timer, next_timer); | |
1232 | } | |
1233 | ||
1234 | /* Setup stats when device is created */ | |
1235 | static int vxlan_init(struct net_device *dev) | |
1236 | { | |
1c51a915 SH |
1237 | struct vxlan_dev *vxlan = netdev_priv(dev); |
1238 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
1239 | struct vxlan_sock *vs; | |
1240 | __u32 vni = vxlan->default_dst.remote_vni; | |
1241 | ||
e8171045 PS |
1242 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1243 | if (!dev->tstats) | |
d342894c | 1244 | return -ENOMEM; |
1245 | ||
1c51a915 SH |
1246 | spin_lock(&vn->sock_lock); |
1247 | vs = vxlan_find_port(dev_net(dev), vxlan->dst_port); | |
1248 | if (vs) { | |
1249 | /* If we have a socket with same port already, reuse it */ | |
1250 | atomic_inc(&vs->refcnt); | |
1251 | vxlan->vn_sock = vs; | |
1252 | hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni)); | |
1253 | } else { | |
1254 | /* otherwise make new socket outside of RTNL */ | |
1255 | dev_hold(dev); | |
1256 | queue_work(vxlan_wq, &vxlan->sock_work); | |
1257 | } | |
1258 | spin_unlock(&vn->sock_lock); | |
1259 | ||
d342894c | 1260 | return 0; |
1261 | } | |
1262 | ||
ebf4063e SH |
1263 | static void vxlan_uninit(struct net_device *dev) |
1264 | { | |
1265 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1266 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
1267 | struct vxlan_sock *vs = vxlan->vn_sock; | |
1268 | ||
1269 | if (vs) | |
1270 | vxlan_sock_release(vn, vs); | |
1271 | free_percpu(dev->tstats); | |
1272 | } | |
1273 | ||
d342894c | 1274 | /* Start ageing timer and join group when device is brought up */ |
1275 | static int vxlan_open(struct net_device *dev) | |
1276 | { | |
1277 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1c51a915 SH |
1278 | struct vxlan_sock *vs = vxlan->vn_sock; |
1279 | ||
1280 | /* socket hasn't been created */ | |
1281 | if (!vs) | |
1282 | return -ENOTCONN; | |
d342894c | 1283 | |
c7995c43 | 1284 | if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
1c51a915 | 1285 | vxlan_sock_hold(vs); |
7c47cedf SH |
1286 | dev_hold(dev); |
1287 | queue_work(vxlan_wq, &vxlan->igmp_work); | |
d342894c | 1288 | } |
1289 | ||
1290 | if (vxlan->age_interval) | |
1291 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
1292 | ||
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | /* Purge the forwarding table */ | |
1297 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
1298 | { | |
31fec5aa | 1299 | unsigned int h; |
d342894c | 1300 | |
1301 | spin_lock_bh(&vxlan->hash_lock); | |
1302 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1303 | struct hlist_node *p, *n; | |
1304 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1305 | struct vxlan_fdb *f | |
1306 | = container_of(p, struct vxlan_fdb, hlist); | |
1307 | vxlan_fdb_destroy(vxlan, f); | |
1308 | } | |
1309 | } | |
1310 | spin_unlock_bh(&vxlan->hash_lock); | |
1311 | } | |
1312 | ||
1313 | /* Cleanup timer and forwarding table on shutdown */ | |
1314 | static int vxlan_stop(struct net_device *dev) | |
1315 | { | |
1316 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1c51a915 | 1317 | struct vxlan_sock *vs = vxlan->vn_sock; |
d342894c | 1318 | |
1c51a915 SH |
1319 | if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
1320 | vxlan_sock_hold(vs); | |
7c47cedf SH |
1321 | dev_hold(dev); |
1322 | queue_work(vxlan_wq, &vxlan->igmp_work); | |
1323 | } | |
d342894c | 1324 | |
1325 | del_timer_sync(&vxlan->age_timer); | |
1326 | ||
1327 | vxlan_flush(vxlan); | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
d342894c | 1332 | /* Stub, nothing needs to be done. */ |
1333 | static void vxlan_set_multicast_list(struct net_device *dev) | |
1334 | { | |
1335 | } | |
1336 | ||
1337 | static const struct net_device_ops vxlan_netdev_ops = { | |
1338 | .ndo_init = vxlan_init, | |
ebf4063e | 1339 | .ndo_uninit = vxlan_uninit, |
d342894c | 1340 | .ndo_open = vxlan_open, |
1341 | .ndo_stop = vxlan_stop, | |
1342 | .ndo_start_xmit = vxlan_xmit, | |
e8171045 | 1343 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
d342894c | 1344 | .ndo_set_rx_mode = vxlan_set_multicast_list, |
1345 | .ndo_change_mtu = eth_change_mtu, | |
1346 | .ndo_validate_addr = eth_validate_addr, | |
1347 | .ndo_set_mac_address = eth_mac_addr, | |
1348 | .ndo_fdb_add = vxlan_fdb_add, | |
1349 | .ndo_fdb_del = vxlan_fdb_delete, | |
1350 | .ndo_fdb_dump = vxlan_fdb_dump, | |
1351 | }; | |
1352 | ||
1353 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1354 | static struct device_type vxlan_type = { | |
1355 | .name = "vxlan", | |
1356 | }; | |
1357 | ||
d342894c | 1358 | /* Initialize the device structure. */ |
1359 | static void vxlan_setup(struct net_device *dev) | |
1360 | { | |
1361 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
31fec5aa | 1362 | unsigned int h; |
05f47d69 | 1363 | int low, high; |
d342894c | 1364 | |
1365 | eth_hw_addr_random(dev); | |
1366 | ether_setup(dev); | |
2840bf22 | 1367 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 1368 | |
1369 | dev->netdev_ops = &vxlan_netdev_ops; | |
ebf4063e | 1370 | dev->destructor = free_netdev; |
d342894c | 1371 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); |
1372 | ||
1373 | dev->tx_queue_len = 0; | |
1374 | dev->features |= NETIF_F_LLTX; | |
1375 | dev->features |= NETIF_F_NETNS_LOCAL; | |
d6727fe3 | 1376 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
0afb1666 | 1377 | dev->features |= NETIF_F_RXCSUM; |
05c0db08 | 1378 | dev->features |= NETIF_F_GSO_SOFTWARE; |
0afb1666 JG |
1379 | |
1380 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
05c0db08 | 1381 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
d342894c | 1382 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
6602d007 | 1383 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d342894c | 1384 | |
553675fb | 1385 | INIT_LIST_HEAD(&vxlan->next); |
d342894c | 1386 | spin_lock_init(&vxlan->hash_lock); |
7c47cedf | 1387 | INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work); |
1c51a915 | 1388 | INIT_WORK(&vxlan->sock_work, vxlan_sock_work); |
d342894c | 1389 | |
1390 | init_timer_deferrable(&vxlan->age_timer); | |
1391 | vxlan->age_timer.function = vxlan_cleanup; | |
1392 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1393 | ||
05f47d69 | 1394 | inet_get_local_port_range(&low, &high); |
1395 | vxlan->port_min = low; | |
1396 | vxlan->port_max = high; | |
823aa873 | 1397 | vxlan->dst_port = htons(vxlan_port); |
05f47d69 | 1398 | |
d342894c | 1399 | vxlan->dev = dev; |
1400 | ||
1401 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1402 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1403 | } | |
1404 | ||
1405 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1406 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
5d174dd8 | 1407 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
d342894c | 1408 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, |
1409 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1410 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1411 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1412 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1413 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1414 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1415 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
e4f67add DS |
1416 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
1417 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
1418 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
1419 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
823aa873 | 1420 | [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, |
d342894c | 1421 | }; |
1422 | ||
1423 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1424 | { | |
1425 | if (tb[IFLA_ADDRESS]) { | |
1426 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1427 | pr_debug("invalid link address (not ethernet)\n"); | |
1428 | return -EINVAL; | |
1429 | } | |
1430 | ||
1431 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1432 | pr_debug("invalid all zero ethernet address\n"); | |
1433 | return -EADDRNOTAVAIL; | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | if (!data) | |
1438 | return -EINVAL; | |
1439 | ||
1440 | if (data[IFLA_VXLAN_ID]) { | |
1441 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1442 | if (id >= VXLAN_VID_MASK) | |
1443 | return -ERANGE; | |
1444 | } | |
1445 | ||
05f47d69 | 1446 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1447 | const struct ifla_vxlan_port_range *p | |
1448 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1449 | ||
1450 | if (ntohs(p->high) < ntohs(p->low)) { | |
1451 | pr_debug("port range %u .. %u not valid\n", | |
1452 | ntohs(p->low), ntohs(p->high)); | |
1453 | return -EINVAL; | |
1454 | } | |
1455 | } | |
1456 | ||
d342894c | 1457 | return 0; |
1458 | } | |
1459 | ||
1b13c97f YB |
1460 | static void vxlan_get_drvinfo(struct net_device *netdev, |
1461 | struct ethtool_drvinfo *drvinfo) | |
1462 | { | |
1463 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
1464 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
1465 | } | |
1466 | ||
1467 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
1468 | .get_drvinfo = vxlan_get_drvinfo, | |
1469 | .get_link = ethtool_op_get_link, | |
1470 | }; | |
1471 | ||
553675fb | 1472 | static void vxlan_del_work(struct work_struct *work) |
1473 | { | |
1474 | struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work); | |
1475 | ||
1476 | sk_release_kernel(vs->sock->sk); | |
1477 | kfree_rcu(vs, rcu); | |
1478 | } | |
1479 | ||
553675fb | 1480 | static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port) |
1481 | { | |
1482 | struct vxlan_sock *vs; | |
1483 | struct sock *sk; | |
1484 | struct sockaddr_in vxlan_addr = { | |
1485 | .sin_family = AF_INET, | |
1486 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
bb3fd687 | 1487 | .sin_port = port, |
553675fb | 1488 | }; |
1489 | int rc; | |
31fec5aa | 1490 | unsigned int h; |
553675fb | 1491 | |
1492 | vs = kmalloc(sizeof(*vs), GFP_KERNEL); | |
1493 | if (!vs) | |
1494 | return ERR_PTR(-ENOMEM); | |
1495 | ||
1496 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1497 | INIT_HLIST_HEAD(&vs->vni_list[h]); | |
1498 | ||
1499 | INIT_WORK(&vs->del_work, vxlan_del_work); | |
1500 | ||
1501 | /* Create UDP socket for encapsulation receive. */ | |
1502 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock); | |
1503 | if (rc < 0) { | |
1504 | pr_debug("UDP socket create failed\n"); | |
1505 | kfree(vs); | |
1506 | return ERR_PTR(rc); | |
1507 | } | |
1508 | ||
1509 | /* Put in proper namespace */ | |
1510 | sk = vs->sock->sk; | |
1511 | sk_change_net(sk, net); | |
1512 | ||
553675fb | 1513 | rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr, |
1514 | sizeof(vxlan_addr)); | |
1515 | if (rc < 0) { | |
1516 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1517 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
1518 | sk_release_kernel(sk); | |
1519 | kfree(vs); | |
1520 | return ERR_PTR(rc); | |
1521 | } | |
1522 | ||
1523 | /* Disable multicast loopback */ | |
1524 | inet_sk(sk)->mc_loop = 0; | |
1525 | ||
1526 | /* Mark socket as an encapsulation socket. */ | |
1527 | udp_sk(sk)->encap_type = 1; | |
1528 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1529 | udp_encap_enable(); | |
7c47cedf | 1530 | atomic_set(&vs->refcnt, 1); |
553675fb | 1531 | |
553675fb | 1532 | return vs; |
1533 | } | |
1534 | ||
1c51a915 SH |
1535 | /* Scheduled at device creation to bind to a socket */ |
1536 | static void vxlan_sock_work(struct work_struct *work) | |
1537 | { | |
1538 | struct vxlan_dev *vxlan | |
1539 | = container_of(work, struct vxlan_dev, sock_work); | |
1540 | struct net_device *dev = vxlan->dev; | |
1541 | struct net *net = dev_net(dev); | |
1542 | __u32 vni = vxlan->default_dst.remote_vni; | |
1543 | __be16 port = vxlan->dst_port; | |
1544 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1545 | struct vxlan_sock *nvs, *ovs; | |
1546 | ||
1547 | nvs = vxlan_socket_create(net, port); | |
1548 | if (IS_ERR(nvs)) { | |
1549 | netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n", | |
1550 | PTR_ERR(nvs)); | |
1551 | goto out; | |
1552 | } | |
1553 | ||
1554 | spin_lock(&vn->sock_lock); | |
1555 | /* Look again to see if can reuse socket */ | |
1556 | ovs = vxlan_find_port(net, port); | |
1557 | if (ovs) { | |
1558 | atomic_inc(&ovs->refcnt); | |
1559 | vxlan->vn_sock = ovs; | |
1560 | hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni)); | |
1561 | spin_unlock(&vn->sock_lock); | |
1562 | ||
1563 | sk_release_kernel(nvs->sock->sk); | |
1564 | kfree(nvs); | |
1565 | } else { | |
1566 | vxlan->vn_sock = nvs; | |
1567 | hlist_add_head_rcu(&nvs->hlist, vs_head(net, port)); | |
1568 | hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni)); | |
1569 | spin_unlock(&vn->sock_lock); | |
1570 | } | |
1571 | out: | |
1572 | dev_put(dev); | |
1573 | } | |
1574 | ||
d342894c | 1575 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1576 | struct nlattr *tb[], struct nlattr *data[]) | |
1577 | { | |
553675fb | 1578 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
d342894c | 1579 | struct vxlan_dev *vxlan = netdev_priv(dev); |
c7995c43 | 1580 | struct vxlan_rdst *dst = &vxlan->default_dst; |
d342894c | 1581 | __u32 vni; |
1582 | int err; | |
1583 | ||
1584 | if (!data[IFLA_VXLAN_ID]) | |
1585 | return -EINVAL; | |
1586 | ||
1587 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
c7995c43 | 1588 | dst->remote_vni = vni; |
d342894c | 1589 | |
5d174dd8 | 1590 | if (data[IFLA_VXLAN_GROUP]) |
1591 | dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
d342894c | 1592 | |
1593 | if (data[IFLA_VXLAN_LOCAL]) | |
1594 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1595 | ||
34e02aa1 | 1596 | if (data[IFLA_VXLAN_LINK] && |
c7995c43 | 1597 | (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) { |
34e02aa1 | 1598 | struct net_device *lowerdev |
c7995c43 | 1599 | = __dev_get_by_index(net, dst->remote_ifindex); |
34e02aa1 | 1600 | |
1601 | if (!lowerdev) { | |
c7995c43 | 1602 | pr_info("ifindex %d does not exist\n", dst->remote_ifindex); |
34e02aa1 | 1603 | return -ENODEV; |
1604 | } | |
d342894c | 1605 | |
34e02aa1 | 1606 | if (!tb[IFLA_MTU]) |
d342894c | 1607 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1ba56fb4 AD |
1608 | |
1609 | /* update header length based on lower device */ | |
1610 | dev->hard_header_len = lowerdev->hard_header_len + | |
1611 | VXLAN_HEADROOM; | |
d342894c | 1612 | } |
1613 | ||
1614 | if (data[IFLA_VXLAN_TOS]) | |
1615 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1616 | ||
afb97186 VB |
1617 | if (data[IFLA_VXLAN_TTL]) |
1618 | vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
1619 | ||
d342894c | 1620 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
e4f67add | 1621 | vxlan->flags |= VXLAN_F_LEARN; |
d342894c | 1622 | |
1623 | if (data[IFLA_VXLAN_AGEING]) | |
1624 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1625 | else | |
1626 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1627 | ||
e4f67add DS |
1628 | if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) |
1629 | vxlan->flags |= VXLAN_F_PROXY; | |
1630 | ||
1631 | if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) | |
1632 | vxlan->flags |= VXLAN_F_RSC; | |
1633 | ||
1634 | if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) | |
1635 | vxlan->flags |= VXLAN_F_L2MISS; | |
1636 | ||
1637 | if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) | |
1638 | vxlan->flags |= VXLAN_F_L3MISS; | |
1639 | ||
d342894c | 1640 | if (data[IFLA_VXLAN_LIMIT]) |
1641 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1642 | ||
05f47d69 | 1643 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1644 | const struct ifla_vxlan_port_range *p | |
1645 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1646 | vxlan->port_min = ntohs(p->low); | |
1647 | vxlan->port_max = ntohs(p->high); | |
1648 | } | |
1649 | ||
823aa873 | 1650 | if (data[IFLA_VXLAN_PORT]) |
1651 | vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); | |
1652 | ||
553675fb | 1653 | if (vxlan_find_vni(net, vni, vxlan->dst_port)) { |
1654 | pr_info("duplicate VNI %u\n", vni); | |
1655 | return -EEXIST; | |
1656 | } | |
1657 | ||
1b13c97f YB |
1658 | SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); |
1659 | ||
d342894c | 1660 | err = register_netdevice(dev); |
1c51a915 | 1661 | if (err) |
553675fb | 1662 | return err; |
d342894c | 1663 | |
553675fb | 1664 | list_add(&vxlan->next, &vn->vxlan_list); |
553675fb | 1665 | |
1666 | return 0; | |
d342894c | 1667 | } |
1668 | ||
1669 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1670 | { | |
1671 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1672 | ||
1673 | hlist_del_rcu(&vxlan->hlist); | |
553675fb | 1674 | list_del(&vxlan->next); |
d342894c | 1675 | unregister_netdevice_queue(dev, head); |
1676 | } | |
1677 | ||
1678 | static size_t vxlan_get_size(const struct net_device *dev) | |
1679 | { | |
1680 | ||
1681 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
5d174dd8 | 1682 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ |
d342894c | 1683 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ |
1684 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1685 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1686 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1687 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
e4f67add DS |
1688 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ |
1689 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
1690 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
1691 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
d342894c | 1692 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1693 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1694 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
823aa873 | 1695 | nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */ |
d342894c | 1696 | 0; |
1697 | } | |
1698 | ||
1699 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1700 | { | |
1701 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
c7995c43 | 1702 | const struct vxlan_rdst *dst = &vxlan->default_dst; |
05f47d69 | 1703 | struct ifla_vxlan_port_range ports = { |
1704 | .low = htons(vxlan->port_min), | |
1705 | .high = htons(vxlan->port_max), | |
1706 | }; | |
d342894c | 1707 | |
c7995c43 | 1708 | if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni)) |
d342894c | 1709 | goto nla_put_failure; |
1710 | ||
5d174dd8 | 1711 | if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip)) |
d342894c | 1712 | goto nla_put_failure; |
1713 | ||
c7995c43 | 1714 | if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) |
d342894c | 1715 | goto nla_put_failure; |
1716 | ||
7c41c42c | 1717 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1718 | goto nla_put_failure; |
1719 | ||
1720 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1721 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
e4f67add DS |
1722 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, |
1723 | !!(vxlan->flags & VXLAN_F_LEARN)) || | |
1724 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
1725 | !!(vxlan->flags & VXLAN_F_PROXY)) || | |
1726 | nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || | |
1727 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
1728 | !!(vxlan->flags & VXLAN_F_L2MISS)) || | |
1729 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
1730 | !!(vxlan->flags & VXLAN_F_L3MISS)) || | |
d342894c | 1731 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
823aa873 | 1732 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) || |
1733 | nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port)) | |
d342894c | 1734 | goto nla_put_failure; |
1735 | ||
05f47d69 | 1736 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1737 | goto nla_put_failure; | |
1738 | ||
d342894c | 1739 | return 0; |
1740 | ||
1741 | nla_put_failure: | |
1742 | return -EMSGSIZE; | |
1743 | } | |
1744 | ||
1745 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1746 | .kind = "vxlan", | |
1747 | .maxtype = IFLA_VXLAN_MAX, | |
1748 | .policy = vxlan_policy, | |
1749 | .priv_size = sizeof(struct vxlan_dev), | |
1750 | .setup = vxlan_setup, | |
1751 | .validate = vxlan_validate, | |
1752 | .newlink = vxlan_newlink, | |
1753 | .dellink = vxlan_dellink, | |
1754 | .get_size = vxlan_get_size, | |
1755 | .fill_info = vxlan_fill_info, | |
1756 | }; | |
1757 | ||
1758 | static __net_init int vxlan_init_net(struct net *net) | |
1759 | { | |
1760 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
31fec5aa | 1761 | unsigned int h; |
d342894c | 1762 | |
553675fb | 1763 | INIT_LIST_HEAD(&vn->vxlan_list); |
1c51a915 | 1764 | spin_lock_init(&vn->sock_lock); |
d342894c | 1765 | |
553675fb | 1766 | for (h = 0; h < PORT_HASH_SIZE; ++h) |
1767 | INIT_HLIST_HEAD(&vn->sock_list[h]); | |
d342894c | 1768 | |
1769 | return 0; | |
1770 | } | |
1771 | ||
1772 | static __net_exit void vxlan_exit_net(struct net *net) | |
1773 | { | |
1774 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
9cb6cb7e | 1775 | struct vxlan_dev *vxlan; |
9cb6cb7e ZM |
1776 | |
1777 | rtnl_lock(); | |
553675fb | 1778 | list_for_each_entry(vxlan, &vn->vxlan_list, next) |
1779 | dev_close(vxlan->dev); | |
9cb6cb7e | 1780 | rtnl_unlock(); |
d342894c | 1781 | } |
1782 | ||
1783 | static struct pernet_operations vxlan_net_ops = { | |
1784 | .init = vxlan_init_net, | |
1785 | .exit = vxlan_exit_net, | |
1786 | .id = &vxlan_net_id, | |
1787 | .size = sizeof(struct vxlan_net), | |
1788 | }; | |
1789 | ||
1790 | static int __init vxlan_init_module(void) | |
1791 | { | |
1792 | int rc; | |
1793 | ||
758c57d1 SH |
1794 | vxlan_wq = alloc_workqueue("vxlan", 0, 0); |
1795 | if (!vxlan_wq) | |
1796 | return -ENOMEM; | |
1797 | ||
d342894c | 1798 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); |
1799 | ||
1800 | rc = register_pernet_device(&vxlan_net_ops); | |
1801 | if (rc) | |
1802 | goto out1; | |
1803 | ||
1804 | rc = rtnl_link_register(&vxlan_link_ops); | |
1805 | if (rc) | |
1806 | goto out2; | |
1807 | ||
1808 | return 0; | |
1809 | ||
1810 | out2: | |
1811 | unregister_pernet_device(&vxlan_net_ops); | |
1812 | out1: | |
758c57d1 | 1813 | destroy_workqueue(vxlan_wq); |
d342894c | 1814 | return rc; |
1815 | } | |
7332a13b | 1816 | late_initcall(vxlan_init_module); |
d342894c | 1817 | |
1818 | static void __exit vxlan_cleanup_module(void) | |
1819 | { | |
d342894c | 1820 | unregister_pernet_device(&vxlan_net_ops); |
b7153984 | 1821 | rtnl_link_unregister(&vxlan_link_ops); |
758c57d1 | 1822 | destroy_workqueue(vxlan_wq); |
6681712d | 1823 | rcu_barrier(); |
d342894c | 1824 | } |
1825 | module_exit(vxlan_cleanup_module); | |
1826 | ||
1827 | MODULE_LICENSE("GPL"); | |
1828 | MODULE_VERSION(VXLAN_VERSION); | |
3b8df3c6 | 1829 | MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); |
d342894c | 1830 | MODULE_ALIAS_RTNL_LINK("vxlan"); |