Commit | Line | Data |
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c5441932 PS |
1 | /* |
2 | * Copyright (c) 2013 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/capability.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/tcp.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/if_arp.h> | |
c5441932 PS |
33 | #include <linux/init.h> |
34 | #include <linux/in6.h> | |
35 | #include <linux/inetdevice.h> | |
36 | #include <linux/igmp.h> | |
37 | #include <linux/netfilter_ipv4.h> | |
38 | #include <linux/etherdevice.h> | |
39 | #include <linux/if_ether.h> | |
40 | #include <linux/if_vlan.h> | |
41 | #include <linux/rculist.h> | |
27d79f3b | 42 | #include <linux/err.h> |
c5441932 PS |
43 | |
44 | #include <net/sock.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/icmp.h> | |
47 | #include <net/protocol.h> | |
48 | #include <net/ip_tunnels.h> | |
49 | #include <net/arp.h> | |
50 | #include <net/checksum.h> | |
51 | #include <net/dsfield.h> | |
52 | #include <net/inet_ecn.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/net_namespace.h> | |
55 | #include <net/netns/generic.h> | |
56 | #include <net/rtnetlink.h> | |
56328486 | 57 | #include <net/udp.h> |
63487bab | 58 | |
c5441932 PS |
59 | #if IS_ENABLED(CONFIG_IPV6) |
60 | #include <net/ipv6.h> | |
61 | #include <net/ip6_fib.h> | |
62 | #include <net/ip6_route.h> | |
63 | #endif | |
64 | ||
967680e0 | 65 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
c5441932 PS |
66 | { |
67 | return hash_32((__force u32)key ^ (__force u32)remote, | |
68 | IP_TNL_HASH_BITS); | |
69 | } | |
70 | ||
c5441932 PS |
71 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, |
72 | __be16 flags, __be32 key) | |
73 | { | |
74 | if (p->i_flags & TUNNEL_KEY) { | |
75 | if (flags & TUNNEL_KEY) | |
76 | return key == p->i_key; | |
77 | else | |
78 | /* key expected, none present */ | |
79 | return false; | |
80 | } else | |
81 | return !(flags & TUNNEL_KEY); | |
82 | } | |
83 | ||
84 | /* Fallback tunnel: no source, no destination, no key, no options | |
85 | ||
86 | Tunnel hash table: | |
87 | We require exact key match i.e. if a key is present in packet | |
88 | it will match only tunnel with the same key; if it is not present, | |
89 | it will match only keyless tunnel. | |
90 | ||
91 | All keysless packets, if not matched configured keyless tunnels | |
92 | will match fallback tunnel. | |
93 | Given src, dst and key, find appropriate for input tunnel. | |
94 | */ | |
95 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
96 | int link, __be16 flags, | |
97 | __be32 remote, __be32 local, | |
98 | __be32 key) | |
99 | { | |
100 | unsigned int hash; | |
101 | struct ip_tunnel *t, *cand = NULL; | |
102 | struct hlist_head *head; | |
103 | ||
967680e0 | 104 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
105 | head = &itn->tunnels[hash]; |
106 | ||
107 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
108 | if (local != t->parms.iph.saddr || | |
109 | remote != t->parms.iph.daddr || | |
110 | !(t->dev->flags & IFF_UP)) | |
111 | continue; | |
112 | ||
113 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
114 | continue; | |
115 | ||
116 | if (t->parms.link == link) | |
117 | return t; | |
118 | else | |
119 | cand = t; | |
120 | } | |
121 | ||
122 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
123 | if (remote != t->parms.iph.daddr || | |
e0056593 | 124 | t->parms.iph.saddr != 0 || |
c5441932 PS |
125 | !(t->dev->flags & IFF_UP)) |
126 | continue; | |
127 | ||
128 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
129 | continue; | |
130 | ||
131 | if (t->parms.link == link) | |
132 | return t; | |
133 | else if (!cand) | |
134 | cand = t; | |
135 | } | |
136 | ||
967680e0 | 137 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
138 | head = &itn->tunnels[hash]; |
139 | ||
140 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
e0056593 DP |
141 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
142 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) | |
143 | continue; | |
144 | ||
145 | if (!(t->dev->flags & IFF_UP)) | |
c5441932 PS |
146 | continue; |
147 | ||
148 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
149 | continue; | |
150 | ||
151 | if (t->parms.link == link) | |
152 | return t; | |
153 | else if (!cand) | |
154 | cand = t; | |
155 | } | |
156 | ||
157 | if (flags & TUNNEL_NO_KEY) | |
158 | goto skip_key_lookup; | |
159 | ||
160 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
161 | if (t->parms.i_key != key || | |
e0056593 DP |
162 | t->parms.iph.saddr != 0 || |
163 | t->parms.iph.daddr != 0 || | |
c5441932 PS |
164 | !(t->dev->flags & IFF_UP)) |
165 | continue; | |
166 | ||
167 | if (t->parms.link == link) | |
168 | return t; | |
169 | else if (!cand) | |
170 | cand = t; | |
171 | } | |
172 | ||
173 | skip_key_lookup: | |
174 | if (cand) | |
175 | return cand; | |
176 | ||
2e15ea39 PS |
177 | t = rcu_dereference(itn->collect_md_tun); |
178 | if (t) | |
179 | return t; | |
180 | ||
c5441932 PS |
181 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) |
182 | return netdev_priv(itn->fb_tunnel_dev); | |
183 | ||
c5441932 PS |
184 | return NULL; |
185 | } | |
186 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
187 | ||
188 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
189 | struct ip_tunnel_parm *parms) | |
190 | { | |
191 | unsigned int h; | |
192 | __be32 remote; | |
6d608f06 | 193 | __be32 i_key = parms->i_key; |
c5441932 PS |
194 | |
195 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
196 | remote = parms->iph.daddr; | |
197 | else | |
198 | remote = 0; | |
199 | ||
6d608f06 SK |
200 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
201 | i_key = 0; | |
202 | ||
203 | h = ip_tunnel_hash(i_key, remote); | |
c5441932 PS |
204 | return &itn->tunnels[h]; |
205 | } | |
206 | ||
207 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
208 | { | |
209 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
210 | ||
2e15ea39 PS |
211 | if (t->collect_md) |
212 | rcu_assign_pointer(itn->collect_md_tun, t); | |
c5441932 PS |
213 | hlist_add_head_rcu(&t->hash_node, head); |
214 | } | |
215 | ||
2e15ea39 | 216 | static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
c5441932 | 217 | { |
2e15ea39 PS |
218 | if (t->collect_md) |
219 | rcu_assign_pointer(itn->collect_md_tun, NULL); | |
c5441932 PS |
220 | hlist_del_init_rcu(&t->hash_node); |
221 | } | |
222 | ||
223 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
224 | struct ip_tunnel_parm *parms, | |
225 | int type) | |
226 | { | |
227 | __be32 remote = parms->iph.daddr; | |
228 | __be32 local = parms->iph.saddr; | |
229 | __be32 key = parms->i_key; | |
5ce54af1 | 230 | __be16 flags = parms->i_flags; |
c5441932 PS |
231 | int link = parms->link; |
232 | struct ip_tunnel *t = NULL; | |
233 | struct hlist_head *head = ip_bucket(itn, parms); | |
234 | ||
235 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
236 | if (local == t->parms.iph.saddr && | |
237 | remote == t->parms.iph.daddr && | |
c5441932 | 238 | link == t->parms.link && |
5ce54af1 DP |
239 | type == t->dev->type && |
240 | ip_tunnel_key_match(&t->parms, flags, key)) | |
c5441932 PS |
241 | break; |
242 | } | |
243 | return t; | |
244 | } | |
245 | ||
246 | static struct net_device *__ip_tunnel_create(struct net *net, | |
247 | const struct rtnl_link_ops *ops, | |
248 | struct ip_tunnel_parm *parms) | |
249 | { | |
250 | int err; | |
251 | struct ip_tunnel *tunnel; | |
252 | struct net_device *dev; | |
253 | char name[IFNAMSIZ]; | |
254 | ||
255 | if (parms->name[0]) | |
256 | strlcpy(name, parms->name, IFNAMSIZ); | |
257 | else { | |
54a5d382 | 258 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
c5441932 PS |
259 | err = -E2BIG; |
260 | goto failed; | |
261 | } | |
262 | strlcpy(name, ops->kind, IFNAMSIZ); | |
263 | strncat(name, "%d", 2); | |
264 | } | |
265 | ||
266 | ASSERT_RTNL(); | |
c835a677 | 267 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
c5441932 PS |
268 | if (!dev) { |
269 | err = -ENOMEM; | |
270 | goto failed; | |
271 | } | |
272 | dev_net_set(dev, net); | |
273 | ||
274 | dev->rtnl_link_ops = ops; | |
275 | ||
276 | tunnel = netdev_priv(dev); | |
277 | tunnel->parms = *parms; | |
5e6700b3 | 278 | tunnel->net = net; |
c5441932 PS |
279 | |
280 | err = register_netdevice(dev); | |
281 | if (err) | |
282 | goto failed_free; | |
283 | ||
284 | return dev; | |
285 | ||
286 | failed_free: | |
287 | free_netdev(dev); | |
288 | failed: | |
289 | return ERR_PTR(err); | |
290 | } | |
291 | ||
7d442fab TH |
292 | static inline void init_tunnel_flow(struct flowi4 *fl4, |
293 | int proto, | |
294 | __be32 daddr, __be32 saddr, | |
295 | __be32 key, __u8 tos, int oif) | |
c5441932 PS |
296 | { |
297 | memset(fl4, 0, sizeof(*fl4)); | |
298 | fl4->flowi4_oif = oif; | |
299 | fl4->daddr = daddr; | |
300 | fl4->saddr = saddr; | |
301 | fl4->flowi4_tos = tos; | |
302 | fl4->flowi4_proto = proto; | |
303 | fl4->fl4_gre_key = key; | |
c5441932 PS |
304 | } |
305 | ||
306 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
307 | { | |
308 | struct net_device *tdev = NULL; | |
309 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
310 | const struct iphdr *iph; | |
311 | int hlen = LL_MAX_HEADER; | |
312 | int mtu = ETH_DATA_LEN; | |
313 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
314 | ||
315 | iph = &tunnel->parms.iph; | |
316 | ||
317 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
318 | if (iph->daddr) { | |
319 | struct flowi4 fl4; | |
320 | struct rtable *rt; | |
321 | ||
7d442fab TH |
322 | init_tunnel_flow(&fl4, iph->protocol, iph->daddr, |
323 | iph->saddr, tunnel->parms.o_key, | |
324 | RT_TOS(iph->tos), tunnel->parms.link); | |
325 | rt = ip_route_output_key(tunnel->net, &fl4); | |
326 | ||
c5441932 PS |
327 | if (!IS_ERR(rt)) { |
328 | tdev = rt->dst.dev; | |
329 | ip_rt_put(rt); | |
330 | } | |
331 | if (dev->type != ARPHRD_ETHER) | |
332 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
333 | |
334 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
335 | } |
336 | ||
337 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 338 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
339 | |
340 | if (tdev) { | |
341 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
342 | mtu = tdev->mtu; | |
343 | } | |
c5441932 PS |
344 | |
345 | dev->needed_headroom = t_hlen + hlen; | |
346 | mtu -= (dev->hard_header_len + t_hlen); | |
347 | ||
348 | if (mtu < 68) | |
349 | mtu = 68; | |
350 | ||
351 | return mtu; | |
352 | } | |
353 | ||
354 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
355 | struct ip_tunnel_net *itn, | |
356 | struct ip_tunnel_parm *parms) | |
357 | { | |
4929fd8c | 358 | struct ip_tunnel *nt; |
c5441932 PS |
359 | struct net_device *dev; |
360 | ||
361 | BUG_ON(!itn->fb_tunnel_dev); | |
c5441932 PS |
362 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); |
363 | if (IS_ERR(dev)) | |
6dd3c9ec | 364 | return ERR_CAST(dev); |
c5441932 PS |
365 | |
366 | dev->mtu = ip_tunnel_bind_dev(dev); | |
367 | ||
368 | nt = netdev_priv(dev); | |
369 | ip_tunnel_add(itn, nt); | |
370 | return nt; | |
371 | } | |
372 | ||
373 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
374 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
375 | bool log_ecn_error) | |
c5441932 | 376 | { |
8f84985f | 377 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
378 | const struct iphdr *iph = ip_hdr(skb); |
379 | int err; | |
380 | ||
c5441932 PS |
381 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
382 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
383 | tunnel->dev->stats.multicast++; |
384 | skb->pkt_type = PACKET_BROADCAST; | |
385 | } | |
386 | #endif | |
387 | ||
388 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
389 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
390 | tunnel->dev->stats.rx_crc_errors++; | |
391 | tunnel->dev->stats.rx_errors++; | |
392 | goto drop; | |
393 | } | |
394 | ||
395 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
396 | if (!(tpi->flags&TUNNEL_SEQ) || | |
397 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
398 | tunnel->dev->stats.rx_fifo_errors++; | |
399 | tunnel->dev->stats.rx_errors++; | |
400 | goto drop; | |
401 | } | |
402 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
403 | } | |
404 | ||
e96f2e7c YC |
405 | skb_reset_network_header(skb); |
406 | ||
c5441932 PS |
407 | err = IP_ECN_decapsulate(iph, skb); |
408 | if (unlikely(err)) { | |
409 | if (log_ecn_error) | |
410 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
411 | &iph->saddr, iph->tos); | |
412 | if (err > 1) { | |
413 | ++tunnel->dev->stats.rx_frame_errors; | |
414 | ++tunnel->dev->stats.rx_errors; | |
415 | goto drop; | |
416 | } | |
417 | } | |
418 | ||
419 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
420 | u64_stats_update_begin(&tstats->syncp); | |
421 | tstats->rx_packets++; | |
422 | tstats->rx_bytes += skb->len; | |
423 | u64_stats_update_end(&tstats->syncp); | |
424 | ||
81b9eab5 AS |
425 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
426 | ||
3d7b46cd PS |
427 | if (tunnel->dev->type == ARPHRD_ETHER) { |
428 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
429 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
430 | } else { | |
431 | skb->dev = tunnel->dev; | |
432 | } | |
64261f23 | 433 | |
2e15ea39 PS |
434 | if (tun_dst) |
435 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
436 | ||
c5441932 PS |
437 | gro_cells_receive(&tunnel->gro_cells, skb); |
438 | return 0; | |
439 | ||
440 | drop: | |
441 | kfree_skb(skb); | |
442 | return 0; | |
443 | } | |
444 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
445 | ||
56328486 TH |
446 | static int ip_encap_hlen(struct ip_tunnel_encap *e) |
447 | { | |
a8c5f90f TH |
448 | const struct ip_tunnel_encap_ops *ops; |
449 | int hlen = -EINVAL; | |
450 | ||
451 | if (e->type == TUNNEL_ENCAP_NONE) | |
56328486 | 452 | return 0; |
a8c5f90f TH |
453 | |
454 | if (e->type >= MAX_IPTUN_ENCAP_OPS) | |
56328486 | 455 | return -EINVAL; |
a8c5f90f TH |
456 | |
457 | rcu_read_lock(); | |
458 | ops = rcu_dereference(iptun_encaps[e->type]); | |
459 | if (likely(ops && ops->encap_hlen)) | |
460 | hlen = ops->encap_hlen(e); | |
461 | rcu_read_unlock(); | |
462 | ||
463 | return hlen; | |
464 | } | |
465 | ||
466 | const struct ip_tunnel_encap_ops __rcu * | |
467 | iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; | |
468 | ||
469 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, | |
470 | unsigned int num) | |
471 | { | |
bb1553c8 TG |
472 | if (num >= MAX_IPTUN_ENCAP_OPS) |
473 | return -ERANGE; | |
474 | ||
a8c5f90f TH |
475 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
476 | &iptun_encaps[num], | |
477 | NULL, ops) ? 0 : -1; | |
56328486 | 478 | } |
a8c5f90f TH |
479 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
480 | ||
481 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
482 | unsigned int num) | |
483 | { | |
484 | int ret; | |
485 | ||
bb1553c8 TG |
486 | if (num >= MAX_IPTUN_ENCAP_OPS) |
487 | return -ERANGE; | |
488 | ||
a8c5f90f TH |
489 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
490 | &iptun_encaps[num], | |
491 | ops, NULL) == ops) ? 0 : -1; | |
492 | ||
493 | synchronize_net(); | |
494 | ||
495 | return ret; | |
496 | } | |
497 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
498 | |
499 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
500 | struct ip_tunnel_encap *ipencap) | |
501 | { | |
502 | int hlen; | |
503 | ||
504 | memset(&t->encap, 0, sizeof(t->encap)); | |
505 | ||
506 | hlen = ip_encap_hlen(ipencap); | |
507 | if (hlen < 0) | |
508 | return hlen; | |
509 | ||
510 | t->encap.type = ipencap->type; | |
511 | t->encap.sport = ipencap->sport; | |
512 | t->encap.dport = ipencap->dport; | |
513 | t->encap.flags = ipencap->flags; | |
514 | ||
515 | t->encap_hlen = hlen; | |
516 | t->hlen = t->encap_hlen + t->tun_hlen; | |
517 | ||
518 | return 0; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
521 | ||
56328486 TH |
522 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
523 | u8 *protocol, struct flowi4 *fl4) | |
524 | { | |
a8c5f90f TH |
525 | const struct ip_tunnel_encap_ops *ops; |
526 | int ret = -EINVAL; | |
527 | ||
528 | if (t->encap.type == TUNNEL_ENCAP_NONE) | |
56328486 | 529 | return 0; |
a8c5f90f | 530 | |
f1fb521f TG |
531 | if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) |
532 | return -EINVAL; | |
533 | ||
a8c5f90f TH |
534 | rcu_read_lock(); |
535 | ops = rcu_dereference(iptun_encaps[t->encap.type]); | |
536 | if (likely(ops && ops->build_header)) | |
537 | ret = ops->build_header(skb, &t->encap, protocol, fl4); | |
538 | rcu_read_unlock(); | |
539 | ||
540 | return ret; | |
56328486 TH |
541 | } |
542 | EXPORT_SYMBOL(ip_tunnel_encap); | |
543 | ||
23a3647b | 544 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 TT |
545 | struct rtable *rt, __be16 df, |
546 | const struct iphdr *inner_iph) | |
23a3647b PS |
547 | { |
548 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 549 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
550 | int mtu; |
551 | ||
552 | if (df) | |
553 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
554 | - sizeof(struct iphdr) - tunnel->hlen; | |
555 | else | |
556 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
557 | ||
558 | if (skb_dst(skb)) | |
559 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
560 | ||
561 | if (skb->protocol == htons(ETH_P_IP)) { | |
562 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
563 | (inner_iph->frag_off & htons(IP_DF)) && |
564 | mtu < pkt_size) { | |
23a3647b PS |
565 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
566 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
567 | return -E2BIG; | |
568 | } | |
569 | } | |
570 | #if IS_ENABLED(CONFIG_IPV6) | |
571 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
572 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
573 | ||
574 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
575 | mtu >= IPV6_MIN_MTU) { | |
576 | if ((tunnel->parms.iph.daddr && | |
577 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
578 | rt6->rt6i_dst.plen == 128) { | |
579 | rt6->rt6i_flags |= RTF_MODIFIED; | |
580 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
581 | } | |
582 | } | |
583 | ||
584 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
585 | mtu < pkt_size) { | |
586 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
587 | return -E2BIG; | |
588 | } | |
589 | } | |
590 | #endif | |
591 | return 0; | |
592 | } | |
593 | ||
c5441932 | 594 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 595 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
596 | { |
597 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
598 | const struct iphdr *inner_iph; | |
c5441932 PS |
599 | struct flowi4 fl4; |
600 | u8 tos, ttl; | |
601 | __be16 df; | |
b045d37b | 602 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
603 | unsigned int max_headroom; /* The extra header space needed */ |
604 | __be32 dst; | |
22fb22ea | 605 | bool connected; |
c5441932 PS |
606 | |
607 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 608 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 609 | |
5146d1f1 BH |
610 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
611 | ||
c5441932 PS |
612 | dst = tnl_params->daddr; |
613 | if (dst == 0) { | |
614 | /* NBMA tunnel */ | |
615 | ||
51456b29 | 616 | if (!skb_dst(skb)) { |
c5441932 PS |
617 | dev->stats.tx_fifo_errors++; |
618 | goto tx_error; | |
619 | } | |
620 | ||
621 | if (skb->protocol == htons(ETH_P_IP)) { | |
622 | rt = skb_rtable(skb); | |
623 | dst = rt_nexthop(rt, inner_iph->daddr); | |
624 | } | |
625 | #if IS_ENABLED(CONFIG_IPV6) | |
626 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
627 | const struct in6_addr *addr6; | |
628 | struct neighbour *neigh; | |
629 | bool do_tx_error_icmp; | |
630 | int addr_type; | |
631 | ||
632 | neigh = dst_neigh_lookup(skb_dst(skb), | |
633 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 634 | if (!neigh) |
c5441932 PS |
635 | goto tx_error; |
636 | ||
637 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
638 | addr_type = ipv6_addr_type(addr6); | |
639 | ||
640 | if (addr_type == IPV6_ADDR_ANY) { | |
641 | addr6 = &ipv6_hdr(skb)->daddr; | |
642 | addr_type = ipv6_addr_type(addr6); | |
643 | } | |
644 | ||
645 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
646 | do_tx_error_icmp = true; | |
647 | else { | |
648 | do_tx_error_icmp = false; | |
649 | dst = addr6->s6_addr32[3]; | |
650 | } | |
651 | neigh_release(neigh); | |
652 | if (do_tx_error_icmp) | |
653 | goto tx_error_icmp; | |
654 | } | |
655 | #endif | |
656 | else | |
657 | goto tx_error; | |
7d442fab TH |
658 | |
659 | connected = false; | |
c5441932 PS |
660 | } |
661 | ||
662 | tos = tnl_params->tos; | |
663 | if (tos & 0x1) { | |
664 | tos &= ~0x1; | |
7d442fab | 665 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 666 | tos = inner_iph->tos; |
7d442fab TH |
667 | connected = false; |
668 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 669 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
670 | connected = false; |
671 | } | |
c5441932 PS |
672 | } |
673 | ||
7d442fab TH |
674 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
675 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link); | |
676 | ||
56328486 TH |
677 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
678 | goto tx_error; | |
679 | ||
e09acddf PA |
680 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : |
681 | NULL; | |
7d442fab TH |
682 | |
683 | if (!rt) { | |
684 | rt = ip_route_output_key(tunnel->net, &fl4); | |
685 | ||
686 | if (IS_ERR(rt)) { | |
687 | dev->stats.tx_carrier_errors++; | |
688 | goto tx_error; | |
689 | } | |
690 | if (connected) | |
e09acddf PA |
691 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
692 | fl4.saddr); | |
c5441932 | 693 | } |
7d442fab | 694 | |
0e6fbc5b | 695 | if (rt->dst.dev == dev) { |
c5441932 PS |
696 | ip_rt_put(rt); |
697 | dev->stats.collisions++; | |
698 | goto tx_error; | |
699 | } | |
c5441932 | 700 | |
fc24f2b2 | 701 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph)) { |
23a3647b PS |
702 | ip_rt_put(rt); |
703 | goto tx_error; | |
c5441932 | 704 | } |
c5441932 PS |
705 | |
706 | if (tunnel->err_count > 0) { | |
707 | if (time_before(jiffies, | |
708 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
709 | tunnel->err_count--; | |
710 | ||
711 | dst_link_failure(skb); | |
712 | } else | |
713 | tunnel->err_count = 0; | |
714 | } | |
715 | ||
d4a71b15 | 716 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
717 | ttl = tnl_params->ttl; |
718 | if (ttl == 0) { | |
719 | if (skb->protocol == htons(ETH_P_IP)) | |
720 | ttl = inner_iph->ttl; | |
721 | #if IS_ENABLED(CONFIG_IPV6) | |
722 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
723 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
724 | #endif | |
725 | else | |
726 | ttl = ip4_dst_hoplimit(&rt->dst); | |
727 | } | |
728 | ||
23a3647b PS |
729 | df = tnl_params->frag_off; |
730 | if (skb->protocol == htons(ETH_P_IP)) | |
731 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
732 | ||
0e6fbc5b | 733 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 734 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 735 | if (max_headroom > dev->needed_headroom) |
c5441932 | 736 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
737 | |
738 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 739 | ip_rt_put(rt); |
3e08f4a7 | 740 | dev->stats.tx_dropped++; |
3acfa1e7 | 741 | kfree_skb(skb); |
3e08f4a7 | 742 | return; |
c5441932 PS |
743 | } |
744 | ||
039f5062 PS |
745 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
746 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
747 | return; |
748 | ||
749 | #if IS_ENABLED(CONFIG_IPV6) | |
750 | tx_error_icmp: | |
751 | dst_link_failure(skb); | |
752 | #endif | |
753 | tx_error: | |
754 | dev->stats.tx_errors++; | |
3acfa1e7 | 755 | kfree_skb(skb); |
c5441932 PS |
756 | } |
757 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
758 | ||
759 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
760 | struct ip_tunnel *t, | |
761 | struct net_device *dev, | |
762 | struct ip_tunnel_parm *p, | |
763 | bool set_mtu) | |
764 | { | |
2e15ea39 | 765 | ip_tunnel_del(itn, t); |
c5441932 PS |
766 | t->parms.iph.saddr = p->iph.saddr; |
767 | t->parms.iph.daddr = p->iph.daddr; | |
768 | t->parms.i_key = p->i_key; | |
769 | t->parms.o_key = p->o_key; | |
770 | if (dev->type != ARPHRD_ETHER) { | |
771 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
772 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
773 | } | |
774 | ip_tunnel_add(itn, t); | |
775 | ||
776 | t->parms.iph.ttl = p->iph.ttl; | |
777 | t->parms.iph.tos = p->iph.tos; | |
778 | t->parms.iph.frag_off = p->iph.frag_off; | |
779 | ||
780 | if (t->parms.link != p->link) { | |
781 | int mtu; | |
782 | ||
783 | t->parms.link = p->link; | |
784 | mtu = ip_tunnel_bind_dev(dev); | |
785 | if (set_mtu) | |
786 | dev->mtu = mtu; | |
787 | } | |
e09acddf | 788 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
789 | netdev_state_change(dev); |
790 | } | |
791 | ||
792 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
793 | { | |
794 | int err = 0; | |
8c923ce2 ND |
795 | struct ip_tunnel *t = netdev_priv(dev); |
796 | struct net *net = t->net; | |
797 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 PS |
798 | |
799 | BUG_ON(!itn->fb_tunnel_dev); | |
800 | switch (cmd) { | |
801 | case SIOCGETTUNNEL: | |
8c923ce2 | 802 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 803 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 804 | if (!t) |
8c923ce2 ND |
805 | t = netdev_priv(dev); |
806 | } | |
c5441932 PS |
807 | memcpy(p, &t->parms, sizeof(*p)); |
808 | break; | |
809 | ||
810 | case SIOCADDTUNNEL: | |
811 | case SIOCCHGTUNNEL: | |
812 | err = -EPERM; | |
813 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
814 | goto done; | |
815 | if (p->iph.ttl) | |
816 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
817 | if (!(p->i_flags & VTI_ISVTI)) { |
818 | if (!(p->i_flags & TUNNEL_KEY)) | |
819 | p->i_key = 0; | |
820 | if (!(p->o_flags & TUNNEL_KEY)) | |
821 | p->o_key = 0; | |
822 | } | |
c5441932 PS |
823 | |
824 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
825 | ||
d61746b2 SK |
826 | if (cmd == SIOCADDTUNNEL) { |
827 | if (!t) { | |
828 | t = ip_tunnel_create(net, itn, p); | |
829 | err = PTR_ERR_OR_ZERO(t); | |
830 | break; | |
831 | } | |
832 | ||
833 | err = -EEXIST; | |
ee30ef4d | 834 | break; |
6dd3c9ec | 835 | } |
c5441932 | 836 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 837 | if (t) { |
c5441932 PS |
838 | if (t->dev != dev) { |
839 | err = -EEXIST; | |
840 | break; | |
841 | } | |
842 | } else { | |
843 | unsigned int nflags = 0; | |
844 | ||
845 | if (ipv4_is_multicast(p->iph.daddr)) | |
846 | nflags = IFF_BROADCAST; | |
847 | else if (p->iph.daddr) | |
848 | nflags = IFF_POINTOPOINT; | |
849 | ||
850 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
851 | err = -EINVAL; | |
852 | break; | |
853 | } | |
854 | ||
855 | t = netdev_priv(dev); | |
856 | } | |
857 | } | |
858 | ||
859 | if (t) { | |
860 | err = 0; | |
861 | ip_tunnel_update(itn, t, dev, p, true); | |
6dd3c9ec FW |
862 | } else { |
863 | err = -ENOENT; | |
864 | } | |
c5441932 PS |
865 | break; |
866 | ||
867 | case SIOCDELTUNNEL: | |
868 | err = -EPERM; | |
869 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
870 | goto done; | |
871 | ||
872 | if (dev == itn->fb_tunnel_dev) { | |
873 | err = -ENOENT; | |
874 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 875 | if (!t) |
c5441932 PS |
876 | goto done; |
877 | err = -EPERM; | |
878 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
879 | goto done; | |
880 | dev = t->dev; | |
881 | } | |
882 | unregister_netdevice(dev); | |
883 | err = 0; | |
884 | break; | |
885 | ||
886 | default: | |
887 | err = -EINVAL; | |
888 | } | |
889 | ||
890 | done: | |
891 | return err; | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
894 | ||
7e059158 | 895 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
896 | { |
897 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
898 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
7e059158 | 899 | int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; |
c5441932 | 900 | |
7e059158 | 901 | if (new_mtu < 68) |
c5441932 | 902 | return -EINVAL; |
7e059158 DW |
903 | |
904 | if (new_mtu > max_mtu) { | |
905 | if (strict) | |
906 | return -EINVAL; | |
907 | ||
908 | new_mtu = max_mtu; | |
909 | } | |
910 | ||
c5441932 PS |
911 | dev->mtu = new_mtu; |
912 | return 0; | |
913 | } | |
7e059158 DW |
914 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
915 | ||
916 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
917 | { | |
918 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
919 | } | |
c5441932 PS |
920 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
921 | ||
922 | static void ip_tunnel_dev_free(struct net_device *dev) | |
923 | { | |
924 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
925 | ||
926 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 927 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
928 | free_percpu(dev->tstats); |
929 | free_netdev(dev); | |
930 | } | |
931 | ||
932 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
933 | { | |
c5441932 PS |
934 | struct ip_tunnel *tunnel = netdev_priv(dev); |
935 | struct ip_tunnel_net *itn; | |
936 | ||
6c742e71 | 937 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
938 | |
939 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 940 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
941 | unregister_netdevice_queue(dev, head); |
942 | } | |
943 | } | |
944 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
945 | ||
1728d4fa ND |
946 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
947 | { | |
948 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
949 | ||
950 | return tunnel->net; | |
951 | } | |
952 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
953 | ||
1e99584b ND |
954 | int ip_tunnel_get_iflink(const struct net_device *dev) |
955 | { | |
956 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
957 | ||
958 | return tunnel->parms.link; | |
959 | } | |
960 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
961 | ||
d3b6f614 | 962 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
963 | struct rtnl_link_ops *ops, char *devname) |
964 | { | |
965 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
966 | struct ip_tunnel_parm parms; | |
6261d983 | 967 | unsigned int i; |
c5441932 | 968 | |
6261d983 | 969 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
970 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
971 | |
972 | if (!ops) { | |
973 | itn->fb_tunnel_dev = NULL; | |
974 | return 0; | |
975 | } | |
6261d983 | 976 | |
c5441932 PS |
977 | memset(&parms, 0, sizeof(parms)); |
978 | if (devname) | |
979 | strlcpy(parms.name, devname, IFNAMSIZ); | |
980 | ||
981 | rtnl_lock(); | |
982 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
983 | /* FB netdevice is special: we have one, and only one per netns. |
984 | * Allowing to move it to another netns is clearly unsafe. | |
985 | */ | |
67013282 | 986 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 987 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 988 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 SK |
989 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
990 | } | |
b4de77ad | 991 | rtnl_unlock(); |
c5441932 | 992 | |
27d79f3b | 993 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
994 | } |
995 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
996 | ||
6c742e71 ND |
997 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
998 | struct rtnl_link_ops *ops) | |
c5441932 | 999 | { |
6c742e71 ND |
1000 | struct net *net = dev_net(itn->fb_tunnel_dev); |
1001 | struct net_device *dev, *aux; | |
c5441932 PS |
1002 | int h; |
1003 | ||
6c742e71 ND |
1004 | for_each_netdev_safe(net, dev, aux) |
1005 | if (dev->rtnl_link_ops == ops) | |
1006 | unregister_netdevice_queue(dev, head); | |
1007 | ||
c5441932 PS |
1008 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1009 | struct ip_tunnel *t; | |
1010 | struct hlist_node *n; | |
1011 | struct hlist_head *thead = &itn->tunnels[h]; | |
1012 | ||
1013 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
1014 | /* If dev is in the same netns, it has already |
1015 | * been added to the list by the previous loop. | |
1016 | */ | |
1017 | if (!net_eq(dev_net(t->dev), net)) | |
1018 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 1019 | } |
c5441932 PS |
1020 | } |
1021 | ||
6c742e71 | 1022 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
1023 | { |
1024 | LIST_HEAD(list); | |
1025 | ||
1026 | rtnl_lock(); | |
6c742e71 | 1027 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
1028 | unregister_netdevice_many(&list); |
1029 | rtnl_unlock(); | |
c5441932 PS |
1030 | } |
1031 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
1032 | ||
1033 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
1034 | struct ip_tunnel_parm *p) | |
1035 | { | |
1036 | struct ip_tunnel *nt; | |
1037 | struct net *net = dev_net(dev); | |
1038 | struct ip_tunnel_net *itn; | |
1039 | int mtu; | |
1040 | int err; | |
1041 | ||
1042 | nt = netdev_priv(dev); | |
1043 | itn = net_generic(net, nt->ip_tnl_net_id); | |
1044 | ||
2e15ea39 PS |
1045 | if (nt->collect_md) { |
1046 | if (rtnl_dereference(itn->collect_md_tun)) | |
1047 | return -EEXIST; | |
1048 | } else { | |
1049 | if (ip_tunnel_find(itn, p, dev->type)) | |
1050 | return -EEXIST; | |
1051 | } | |
c5441932 | 1052 | |
5e6700b3 | 1053 | nt->net = net; |
c5441932 PS |
1054 | nt->parms = *p; |
1055 | err = register_netdevice(dev); | |
1056 | if (err) | |
1057 | goto out; | |
1058 | ||
1059 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1060 | eth_hw_addr_random(dev); | |
1061 | ||
1062 | mtu = ip_tunnel_bind_dev(dev); | |
1063 | if (!tb[IFLA_MTU]) | |
1064 | dev->mtu = mtu; | |
1065 | ||
1066 | ip_tunnel_add(itn, nt); | |
c5441932 PS |
1067 | out: |
1068 | return err; | |
1069 | } | |
1070 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1071 | ||
1072 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
1073 | struct ip_tunnel_parm *p) | |
1074 | { | |
6c742e71 | 1075 | struct ip_tunnel *t; |
c5441932 | 1076 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1077 | struct net *net = tunnel->net; |
c5441932 PS |
1078 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1079 | ||
1080 | if (dev == itn->fb_tunnel_dev) | |
1081 | return -EINVAL; | |
1082 | ||
c5441932 PS |
1083 | t = ip_tunnel_find(itn, p, dev->type); |
1084 | ||
1085 | if (t) { | |
1086 | if (t->dev != dev) | |
1087 | return -EEXIST; | |
1088 | } else { | |
6c742e71 | 1089 | t = tunnel; |
c5441932 PS |
1090 | |
1091 | if (dev->type != ARPHRD_ETHER) { | |
1092 | unsigned int nflags = 0; | |
1093 | ||
1094 | if (ipv4_is_multicast(p->iph.daddr)) | |
1095 | nflags = IFF_BROADCAST; | |
1096 | else if (p->iph.daddr) | |
1097 | nflags = IFF_POINTOPOINT; | |
1098 | ||
1099 | if ((dev->flags ^ nflags) & | |
1100 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1101 | return -EINVAL; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
1106 | return 0; | |
1107 | } | |
1108 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1109 | ||
1110 | int ip_tunnel_init(struct net_device *dev) | |
1111 | { | |
1112 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1113 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1114 | int err; |
c5441932 PS |
1115 | |
1116 | dev->destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1117 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1118 | if (!dev->tstats) |
1119 | return -ENOMEM; | |
1120 | ||
e09acddf PA |
1121 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1122 | if (err) { | |
9a4aa9af | 1123 | free_percpu(dev->tstats); |
e09acddf | 1124 | return err; |
9a4aa9af TH |
1125 | } |
1126 | ||
c5441932 PS |
1127 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1128 | if (err) { | |
e09acddf | 1129 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1130 | free_percpu(dev->tstats); |
1131 | return err; | |
1132 | } | |
1133 | ||
1134 | tunnel->dev = dev; | |
6c742e71 | 1135 | tunnel->net = dev_net(dev); |
c5441932 PS |
1136 | strcpy(tunnel->parms.name, dev->name); |
1137 | iph->version = 4; | |
1138 | iph->ihl = 5; | |
1139 | ||
2e15ea39 PS |
1140 | if (tunnel->collect_md) { |
1141 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1142 | netif_keep_dst(dev); | |
1143 | } | |
c5441932 PS |
1144 | return 0; |
1145 | } | |
1146 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1147 | ||
1148 | void ip_tunnel_uninit(struct net_device *dev) | |
1149 | { | |
c5441932 | 1150 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1151 | struct net *net = tunnel->net; |
c5441932 PS |
1152 | struct ip_tunnel_net *itn; |
1153 | ||
1154 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1155 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1156 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1157 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1158 | |
e09acddf | 1159 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1160 | } |
1161 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1162 | ||
1163 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
1164 | void ip_tunnel_setup(struct net_device *dev, int net_id) | |
1165 | { | |
1166 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1167 | tunnel->ip_tnl_net_id = net_id; | |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1170 | ||
1171 | MODULE_LICENSE("GPL"); |