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 | ||
a8c5f90f TH |
446 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
447 | unsigned int num) | |
448 | { | |
bb1553c8 TG |
449 | if (num >= MAX_IPTUN_ENCAP_OPS) |
450 | return -ERANGE; | |
451 | ||
a8c5f90f TH |
452 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
453 | &iptun_encaps[num], | |
454 | NULL, ops) ? 0 : -1; | |
56328486 | 455 | } |
a8c5f90f TH |
456 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
457 | ||
458 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
459 | unsigned int num) | |
460 | { | |
461 | int ret; | |
462 | ||
bb1553c8 TG |
463 | if (num >= MAX_IPTUN_ENCAP_OPS) |
464 | return -ERANGE; | |
465 | ||
a8c5f90f TH |
466 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
467 | &iptun_encaps[num], | |
468 | ops, NULL) == ops) ? 0 : -1; | |
469 | ||
470 | synchronize_net(); | |
471 | ||
472 | return ret; | |
473 | } | |
474 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
475 | |
476 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
477 | struct ip_tunnel_encap *ipencap) | |
478 | { | |
479 | int hlen; | |
480 | ||
481 | memset(&t->encap, 0, sizeof(t->encap)); | |
482 | ||
483 | hlen = ip_encap_hlen(ipencap); | |
484 | if (hlen < 0) | |
485 | return hlen; | |
486 | ||
487 | t->encap.type = ipencap->type; | |
488 | t->encap.sport = ipencap->sport; | |
489 | t->encap.dport = ipencap->dport; | |
490 | t->encap.flags = ipencap->flags; | |
491 | ||
492 | t->encap_hlen = hlen; | |
493 | t->hlen = t->encap_hlen + t->tun_hlen; | |
494 | ||
495 | return 0; | |
496 | } | |
497 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
498 | ||
23a3647b | 499 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 TT |
500 | struct rtable *rt, __be16 df, |
501 | const struct iphdr *inner_iph) | |
23a3647b PS |
502 | { |
503 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 504 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
505 | int mtu; |
506 | ||
507 | if (df) | |
508 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
509 | - sizeof(struct iphdr) - tunnel->hlen; | |
510 | else | |
511 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
512 | ||
513 | if (skb_dst(skb)) | |
514 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
515 | ||
516 | if (skb->protocol == htons(ETH_P_IP)) { | |
517 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
518 | (inner_iph->frag_off & htons(IP_DF)) && |
519 | mtu < pkt_size) { | |
23a3647b PS |
520 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
521 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
522 | return -E2BIG; | |
523 | } | |
524 | } | |
525 | #if IS_ENABLED(CONFIG_IPV6) | |
526 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
527 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
528 | ||
529 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
530 | mtu >= IPV6_MIN_MTU) { | |
531 | if ((tunnel->parms.iph.daddr && | |
532 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
533 | rt6->rt6i_dst.plen == 128) { | |
534 | rt6->rt6i_flags |= RTF_MODIFIED; | |
535 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
536 | } | |
537 | } | |
538 | ||
539 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
540 | mtu < pkt_size) { | |
541 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
542 | return -E2BIG; | |
543 | } | |
544 | } | |
545 | #endif | |
546 | return 0; | |
547 | } | |
548 | ||
c5441932 | 549 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 550 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
551 | { |
552 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
553 | const struct iphdr *inner_iph; | |
c5441932 PS |
554 | struct flowi4 fl4; |
555 | u8 tos, ttl; | |
556 | __be16 df; | |
b045d37b | 557 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
558 | unsigned int max_headroom; /* The extra header space needed */ |
559 | __be32 dst; | |
22fb22ea | 560 | bool connected; |
c5441932 PS |
561 | |
562 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 563 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 564 | |
5146d1f1 BH |
565 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
566 | ||
c5441932 PS |
567 | dst = tnl_params->daddr; |
568 | if (dst == 0) { | |
569 | /* NBMA tunnel */ | |
570 | ||
51456b29 | 571 | if (!skb_dst(skb)) { |
c5441932 PS |
572 | dev->stats.tx_fifo_errors++; |
573 | goto tx_error; | |
574 | } | |
575 | ||
576 | if (skb->protocol == htons(ETH_P_IP)) { | |
577 | rt = skb_rtable(skb); | |
578 | dst = rt_nexthop(rt, inner_iph->daddr); | |
579 | } | |
580 | #if IS_ENABLED(CONFIG_IPV6) | |
581 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
582 | const struct in6_addr *addr6; | |
583 | struct neighbour *neigh; | |
584 | bool do_tx_error_icmp; | |
585 | int addr_type; | |
586 | ||
587 | neigh = dst_neigh_lookup(skb_dst(skb), | |
588 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 589 | if (!neigh) |
c5441932 PS |
590 | goto tx_error; |
591 | ||
592 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
593 | addr_type = ipv6_addr_type(addr6); | |
594 | ||
595 | if (addr_type == IPV6_ADDR_ANY) { | |
596 | addr6 = &ipv6_hdr(skb)->daddr; | |
597 | addr_type = ipv6_addr_type(addr6); | |
598 | } | |
599 | ||
600 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
601 | do_tx_error_icmp = true; | |
602 | else { | |
603 | do_tx_error_icmp = false; | |
604 | dst = addr6->s6_addr32[3]; | |
605 | } | |
606 | neigh_release(neigh); | |
607 | if (do_tx_error_icmp) | |
608 | goto tx_error_icmp; | |
609 | } | |
610 | #endif | |
611 | else | |
612 | goto tx_error; | |
7d442fab TH |
613 | |
614 | connected = false; | |
c5441932 PS |
615 | } |
616 | ||
617 | tos = tnl_params->tos; | |
618 | if (tos & 0x1) { | |
619 | tos &= ~0x1; | |
7d442fab | 620 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 621 | tos = inner_iph->tos; |
7d442fab TH |
622 | connected = false; |
623 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 624 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
625 | connected = false; |
626 | } | |
c5441932 PS |
627 | } |
628 | ||
7d442fab TH |
629 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
630 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link); | |
631 | ||
56328486 TH |
632 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
633 | goto tx_error; | |
634 | ||
e09acddf PA |
635 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : |
636 | NULL; | |
7d442fab TH |
637 | |
638 | if (!rt) { | |
639 | rt = ip_route_output_key(tunnel->net, &fl4); | |
640 | ||
641 | if (IS_ERR(rt)) { | |
642 | dev->stats.tx_carrier_errors++; | |
643 | goto tx_error; | |
644 | } | |
645 | if (connected) | |
e09acddf PA |
646 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
647 | fl4.saddr); | |
c5441932 | 648 | } |
7d442fab | 649 | |
0e6fbc5b | 650 | if (rt->dst.dev == dev) { |
c5441932 PS |
651 | ip_rt_put(rt); |
652 | dev->stats.collisions++; | |
653 | goto tx_error; | |
654 | } | |
c5441932 | 655 | |
fc24f2b2 | 656 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph)) { |
23a3647b PS |
657 | ip_rt_put(rt); |
658 | goto tx_error; | |
c5441932 | 659 | } |
c5441932 PS |
660 | |
661 | if (tunnel->err_count > 0) { | |
662 | if (time_before(jiffies, | |
663 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
664 | tunnel->err_count--; | |
665 | ||
666 | dst_link_failure(skb); | |
667 | } else | |
668 | tunnel->err_count = 0; | |
669 | } | |
670 | ||
d4a71b15 | 671 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
672 | ttl = tnl_params->ttl; |
673 | if (ttl == 0) { | |
674 | if (skb->protocol == htons(ETH_P_IP)) | |
675 | ttl = inner_iph->ttl; | |
676 | #if IS_ENABLED(CONFIG_IPV6) | |
677 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
678 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
679 | #endif | |
680 | else | |
681 | ttl = ip4_dst_hoplimit(&rt->dst); | |
682 | } | |
683 | ||
23a3647b PS |
684 | df = tnl_params->frag_off; |
685 | if (skb->protocol == htons(ETH_P_IP)) | |
686 | df |= (inner_iph->frag_off&htons(IP_DF)); | |
687 | ||
0e6fbc5b | 688 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 689 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 690 | if (max_headroom > dev->needed_headroom) |
c5441932 | 691 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
692 | |
693 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 694 | ip_rt_put(rt); |
3e08f4a7 | 695 | dev->stats.tx_dropped++; |
3acfa1e7 | 696 | kfree_skb(skb); |
3e08f4a7 | 697 | return; |
c5441932 PS |
698 | } |
699 | ||
039f5062 PS |
700 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
701 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
702 | return; |
703 | ||
704 | #if IS_ENABLED(CONFIG_IPV6) | |
705 | tx_error_icmp: | |
706 | dst_link_failure(skb); | |
707 | #endif | |
708 | tx_error: | |
709 | dev->stats.tx_errors++; | |
3acfa1e7 | 710 | kfree_skb(skb); |
c5441932 PS |
711 | } |
712 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
713 | ||
714 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
715 | struct ip_tunnel *t, | |
716 | struct net_device *dev, | |
717 | struct ip_tunnel_parm *p, | |
718 | bool set_mtu) | |
719 | { | |
2e15ea39 | 720 | ip_tunnel_del(itn, t); |
c5441932 PS |
721 | t->parms.iph.saddr = p->iph.saddr; |
722 | t->parms.iph.daddr = p->iph.daddr; | |
723 | t->parms.i_key = p->i_key; | |
724 | t->parms.o_key = p->o_key; | |
725 | if (dev->type != ARPHRD_ETHER) { | |
726 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
727 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
728 | } | |
729 | ip_tunnel_add(itn, t); | |
730 | ||
731 | t->parms.iph.ttl = p->iph.ttl; | |
732 | t->parms.iph.tos = p->iph.tos; | |
733 | t->parms.iph.frag_off = p->iph.frag_off; | |
734 | ||
735 | if (t->parms.link != p->link) { | |
736 | int mtu; | |
737 | ||
738 | t->parms.link = p->link; | |
739 | mtu = ip_tunnel_bind_dev(dev); | |
740 | if (set_mtu) | |
741 | dev->mtu = mtu; | |
742 | } | |
e09acddf | 743 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
744 | netdev_state_change(dev); |
745 | } | |
746 | ||
747 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
748 | { | |
749 | int err = 0; | |
8c923ce2 ND |
750 | struct ip_tunnel *t = netdev_priv(dev); |
751 | struct net *net = t->net; | |
752 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 PS |
753 | |
754 | BUG_ON(!itn->fb_tunnel_dev); | |
755 | switch (cmd) { | |
756 | case SIOCGETTUNNEL: | |
8c923ce2 | 757 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 758 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 759 | if (!t) |
8c923ce2 ND |
760 | t = netdev_priv(dev); |
761 | } | |
c5441932 PS |
762 | memcpy(p, &t->parms, sizeof(*p)); |
763 | break; | |
764 | ||
765 | case SIOCADDTUNNEL: | |
766 | case SIOCCHGTUNNEL: | |
767 | err = -EPERM; | |
768 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
769 | goto done; | |
770 | if (p->iph.ttl) | |
771 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
772 | if (!(p->i_flags & VTI_ISVTI)) { |
773 | if (!(p->i_flags & TUNNEL_KEY)) | |
774 | p->i_key = 0; | |
775 | if (!(p->o_flags & TUNNEL_KEY)) | |
776 | p->o_key = 0; | |
777 | } | |
c5441932 PS |
778 | |
779 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
780 | ||
d61746b2 SK |
781 | if (cmd == SIOCADDTUNNEL) { |
782 | if (!t) { | |
783 | t = ip_tunnel_create(net, itn, p); | |
784 | err = PTR_ERR_OR_ZERO(t); | |
785 | break; | |
786 | } | |
787 | ||
788 | err = -EEXIST; | |
ee30ef4d | 789 | break; |
6dd3c9ec | 790 | } |
c5441932 | 791 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 792 | if (t) { |
c5441932 PS |
793 | if (t->dev != dev) { |
794 | err = -EEXIST; | |
795 | break; | |
796 | } | |
797 | } else { | |
798 | unsigned int nflags = 0; | |
799 | ||
800 | if (ipv4_is_multicast(p->iph.daddr)) | |
801 | nflags = IFF_BROADCAST; | |
802 | else if (p->iph.daddr) | |
803 | nflags = IFF_POINTOPOINT; | |
804 | ||
805 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
806 | err = -EINVAL; | |
807 | break; | |
808 | } | |
809 | ||
810 | t = netdev_priv(dev); | |
811 | } | |
812 | } | |
813 | ||
814 | if (t) { | |
815 | err = 0; | |
816 | ip_tunnel_update(itn, t, dev, p, true); | |
6dd3c9ec FW |
817 | } else { |
818 | err = -ENOENT; | |
819 | } | |
c5441932 PS |
820 | break; |
821 | ||
822 | case SIOCDELTUNNEL: | |
823 | err = -EPERM; | |
824 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
825 | goto done; | |
826 | ||
827 | if (dev == itn->fb_tunnel_dev) { | |
828 | err = -ENOENT; | |
829 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 830 | if (!t) |
c5441932 PS |
831 | goto done; |
832 | err = -EPERM; | |
833 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
834 | goto done; | |
835 | dev = t->dev; | |
836 | } | |
837 | unregister_netdevice(dev); | |
838 | err = 0; | |
839 | break; | |
840 | ||
841 | default: | |
842 | err = -EINVAL; | |
843 | } | |
844 | ||
845 | done: | |
846 | return err; | |
847 | } | |
848 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
849 | ||
7e059158 | 850 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
851 | { |
852 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
853 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
7e059158 | 854 | int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; |
c5441932 | 855 | |
7e059158 | 856 | if (new_mtu < 68) |
c5441932 | 857 | return -EINVAL; |
7e059158 DW |
858 | |
859 | if (new_mtu > max_mtu) { | |
860 | if (strict) | |
861 | return -EINVAL; | |
862 | ||
863 | new_mtu = max_mtu; | |
864 | } | |
865 | ||
c5441932 PS |
866 | dev->mtu = new_mtu; |
867 | return 0; | |
868 | } | |
7e059158 DW |
869 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
870 | ||
871 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
872 | { | |
873 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
874 | } | |
c5441932 PS |
875 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
876 | ||
877 | static void ip_tunnel_dev_free(struct net_device *dev) | |
878 | { | |
879 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
880 | ||
881 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 882 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
883 | free_percpu(dev->tstats); |
884 | free_netdev(dev); | |
885 | } | |
886 | ||
887 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
888 | { | |
c5441932 PS |
889 | struct ip_tunnel *tunnel = netdev_priv(dev); |
890 | struct ip_tunnel_net *itn; | |
891 | ||
6c742e71 | 892 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
893 | |
894 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 895 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
896 | unregister_netdevice_queue(dev, head); |
897 | } | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
900 | ||
1728d4fa ND |
901 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
902 | { | |
903 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
904 | ||
905 | return tunnel->net; | |
906 | } | |
907 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
908 | ||
1e99584b ND |
909 | int ip_tunnel_get_iflink(const struct net_device *dev) |
910 | { | |
911 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
912 | ||
913 | return tunnel->parms.link; | |
914 | } | |
915 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
916 | ||
d3b6f614 | 917 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
c5441932 PS |
918 | struct rtnl_link_ops *ops, char *devname) |
919 | { | |
920 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
921 | struct ip_tunnel_parm parms; | |
6261d983 | 922 | unsigned int i; |
c5441932 | 923 | |
6261d983 | 924 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
925 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
926 | |
927 | if (!ops) { | |
928 | itn->fb_tunnel_dev = NULL; | |
929 | return 0; | |
930 | } | |
6261d983 | 931 | |
c5441932 PS |
932 | memset(&parms, 0, sizeof(parms)); |
933 | if (devname) | |
934 | strlcpy(parms.name, devname, IFNAMSIZ); | |
935 | ||
936 | rtnl_lock(); | |
937 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
938 | /* FB netdevice is special: we have one, and only one per netns. |
939 | * Allowing to move it to another netns is clearly unsafe. | |
940 | */ | |
67013282 | 941 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 942 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 943 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 SK |
944 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
945 | } | |
b4de77ad | 946 | rtnl_unlock(); |
c5441932 | 947 | |
27d79f3b | 948 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
949 | } |
950 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
951 | ||
6c742e71 ND |
952 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
953 | struct rtnl_link_ops *ops) | |
c5441932 | 954 | { |
6c742e71 ND |
955 | struct net *net = dev_net(itn->fb_tunnel_dev); |
956 | struct net_device *dev, *aux; | |
c5441932 PS |
957 | int h; |
958 | ||
6c742e71 ND |
959 | for_each_netdev_safe(net, dev, aux) |
960 | if (dev->rtnl_link_ops == ops) | |
961 | unregister_netdevice_queue(dev, head); | |
962 | ||
c5441932 PS |
963 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
964 | struct ip_tunnel *t; | |
965 | struct hlist_node *n; | |
966 | struct hlist_head *thead = &itn->tunnels[h]; | |
967 | ||
968 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
969 | /* If dev is in the same netns, it has already |
970 | * been added to the list by the previous loop. | |
971 | */ | |
972 | if (!net_eq(dev_net(t->dev), net)) | |
973 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 974 | } |
c5441932 PS |
975 | } |
976 | ||
6c742e71 | 977 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
978 | { |
979 | LIST_HEAD(list); | |
980 | ||
981 | rtnl_lock(); | |
6c742e71 | 982 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
983 | unregister_netdevice_many(&list); |
984 | rtnl_unlock(); | |
c5441932 PS |
985 | } |
986 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
987 | ||
988 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
989 | struct ip_tunnel_parm *p) | |
990 | { | |
991 | struct ip_tunnel *nt; | |
992 | struct net *net = dev_net(dev); | |
993 | struct ip_tunnel_net *itn; | |
994 | int mtu; | |
995 | int err; | |
996 | ||
997 | nt = netdev_priv(dev); | |
998 | itn = net_generic(net, nt->ip_tnl_net_id); | |
999 | ||
2e15ea39 PS |
1000 | if (nt->collect_md) { |
1001 | if (rtnl_dereference(itn->collect_md_tun)) | |
1002 | return -EEXIST; | |
1003 | } else { | |
1004 | if (ip_tunnel_find(itn, p, dev->type)) | |
1005 | return -EEXIST; | |
1006 | } | |
c5441932 | 1007 | |
5e6700b3 | 1008 | nt->net = net; |
c5441932 PS |
1009 | nt->parms = *p; |
1010 | err = register_netdevice(dev); | |
1011 | if (err) | |
1012 | goto out; | |
1013 | ||
1014 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1015 | eth_hw_addr_random(dev); | |
1016 | ||
1017 | mtu = ip_tunnel_bind_dev(dev); | |
1018 | if (!tb[IFLA_MTU]) | |
1019 | dev->mtu = mtu; | |
1020 | ||
1021 | ip_tunnel_add(itn, nt); | |
c5441932 PS |
1022 | out: |
1023 | return err; | |
1024 | } | |
1025 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1026 | ||
1027 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
1028 | struct ip_tunnel_parm *p) | |
1029 | { | |
6c742e71 | 1030 | struct ip_tunnel *t; |
c5441932 | 1031 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1032 | struct net *net = tunnel->net; |
c5441932 PS |
1033 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1034 | ||
1035 | if (dev == itn->fb_tunnel_dev) | |
1036 | return -EINVAL; | |
1037 | ||
c5441932 PS |
1038 | t = ip_tunnel_find(itn, p, dev->type); |
1039 | ||
1040 | if (t) { | |
1041 | if (t->dev != dev) | |
1042 | return -EEXIST; | |
1043 | } else { | |
6c742e71 | 1044 | t = tunnel; |
c5441932 PS |
1045 | |
1046 | if (dev->type != ARPHRD_ETHER) { | |
1047 | unsigned int nflags = 0; | |
1048 | ||
1049 | if (ipv4_is_multicast(p->iph.daddr)) | |
1050 | nflags = IFF_BROADCAST; | |
1051 | else if (p->iph.daddr) | |
1052 | nflags = IFF_POINTOPOINT; | |
1053 | ||
1054 | if ((dev->flags ^ nflags) & | |
1055 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1056 | return -EINVAL; | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
1061 | return 0; | |
1062 | } | |
1063 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1064 | ||
1065 | int ip_tunnel_init(struct net_device *dev) | |
1066 | { | |
1067 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1068 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1069 | int err; |
c5441932 PS |
1070 | |
1071 | dev->destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1072 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1073 | if (!dev->tstats) |
1074 | return -ENOMEM; | |
1075 | ||
e09acddf PA |
1076 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1077 | if (err) { | |
9a4aa9af | 1078 | free_percpu(dev->tstats); |
e09acddf | 1079 | return err; |
9a4aa9af TH |
1080 | } |
1081 | ||
c5441932 PS |
1082 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1083 | if (err) { | |
e09acddf | 1084 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1085 | free_percpu(dev->tstats); |
1086 | return err; | |
1087 | } | |
1088 | ||
1089 | tunnel->dev = dev; | |
6c742e71 | 1090 | tunnel->net = dev_net(dev); |
c5441932 PS |
1091 | strcpy(tunnel->parms.name, dev->name); |
1092 | iph->version = 4; | |
1093 | iph->ihl = 5; | |
1094 | ||
2e15ea39 PS |
1095 | if (tunnel->collect_md) { |
1096 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1097 | netif_keep_dst(dev); | |
1098 | } | |
c5441932 PS |
1099 | return 0; |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1102 | ||
1103 | void ip_tunnel_uninit(struct net_device *dev) | |
1104 | { | |
c5441932 | 1105 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1106 | struct net *net = tunnel->net; |
c5441932 PS |
1107 | struct ip_tunnel_net *itn; |
1108 | ||
1109 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1110 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1111 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1112 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1113 | |
e09acddf | 1114 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1115 | } |
1116 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1117 | ||
1118 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
1119 | void ip_tunnel_setup(struct net_device *dev, int net_id) | |
1120 | { | |
1121 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1122 | tunnel->ip_tnl_net_id = net_id; | |
1123 | } | |
1124 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1125 | ||
1126 | MODULE_LICENSE("GPL"); |