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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> |
cfc7381b | 58 | #include <net/dst_metadata.h> |
63487bab | 59 | |
c5441932 PS |
60 | #if IS_ENABLED(CONFIG_IPV6) |
61 | #include <net/ipv6.h> | |
62 | #include <net/ip6_fib.h> | |
63 | #include <net/ip6_route.h> | |
64 | #endif | |
65 | ||
967680e0 | 66 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
c5441932 PS |
67 | { |
68 | return hash_32((__force u32)key ^ (__force u32)remote, | |
69 | IP_TNL_HASH_BITS); | |
70 | } | |
71 | ||
c5441932 PS |
72 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, |
73 | __be16 flags, __be32 key) | |
74 | { | |
75 | if (p->i_flags & TUNNEL_KEY) { | |
76 | if (flags & TUNNEL_KEY) | |
77 | return key == p->i_key; | |
78 | else | |
79 | /* key expected, none present */ | |
80 | return false; | |
81 | } else | |
82 | return !(flags & TUNNEL_KEY); | |
83 | } | |
84 | ||
85 | /* Fallback tunnel: no source, no destination, no key, no options | |
86 | ||
87 | Tunnel hash table: | |
88 | We require exact key match i.e. if a key is present in packet | |
89 | it will match only tunnel with the same key; if it is not present, | |
90 | it will match only keyless tunnel. | |
91 | ||
92 | All keysless packets, if not matched configured keyless tunnels | |
93 | will match fallback tunnel. | |
94 | Given src, dst and key, find appropriate for input tunnel. | |
95 | */ | |
96 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
97 | int link, __be16 flags, | |
98 | __be32 remote, __be32 local, | |
99 | __be32 key) | |
100 | { | |
101 | unsigned int hash; | |
102 | struct ip_tunnel *t, *cand = NULL; | |
103 | struct hlist_head *head; | |
104 | ||
967680e0 | 105 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
106 | head = &itn->tunnels[hash]; |
107 | ||
108 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
109 | if (local != t->parms.iph.saddr || | |
110 | remote != t->parms.iph.daddr || | |
111 | !(t->dev->flags & IFF_UP)) | |
112 | continue; | |
113 | ||
114 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
115 | continue; | |
116 | ||
117 | if (t->parms.link == link) | |
118 | return t; | |
119 | else | |
120 | cand = t; | |
121 | } | |
122 | ||
123 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
124 | if (remote != t->parms.iph.daddr || | |
e0056593 | 125 | t->parms.iph.saddr != 0 || |
c5441932 PS |
126 | !(t->dev->flags & IFF_UP)) |
127 | continue; | |
128 | ||
129 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
130 | continue; | |
131 | ||
132 | if (t->parms.link == link) | |
133 | return t; | |
134 | else if (!cand) | |
135 | cand = t; | |
136 | } | |
137 | ||
967680e0 | 138 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
139 | head = &itn->tunnels[hash]; |
140 | ||
141 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
e0056593 DP |
142 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
143 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) | |
144 | continue; | |
145 | ||
146 | if (!(t->dev->flags & IFF_UP)) | |
c5441932 PS |
147 | continue; |
148 | ||
149 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
150 | continue; | |
151 | ||
152 | if (t->parms.link == link) | |
153 | return t; | |
154 | else if (!cand) | |
155 | cand = t; | |
156 | } | |
157 | ||
158 | if (flags & TUNNEL_NO_KEY) | |
159 | goto skip_key_lookup; | |
160 | ||
161 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
162 | if (t->parms.i_key != key || | |
e0056593 DP |
163 | t->parms.iph.saddr != 0 || |
164 | t->parms.iph.daddr != 0 || | |
c5441932 PS |
165 | !(t->dev->flags & IFF_UP)) |
166 | continue; | |
167 | ||
168 | if (t->parms.link == link) | |
169 | return t; | |
170 | else if (!cand) | |
171 | cand = t; | |
172 | } | |
173 | ||
174 | skip_key_lookup: | |
175 | if (cand) | |
176 | return cand; | |
177 | ||
2e15ea39 | 178 | t = rcu_dereference(itn->collect_md_tun); |
833a8b40 | 179 | if (t && t->dev->flags & IFF_UP) |
2e15ea39 PS |
180 | return t; |
181 | ||
c5441932 PS |
182 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) |
183 | return netdev_priv(itn->fb_tunnel_dev); | |
184 | ||
c5441932 PS |
185 | return NULL; |
186 | } | |
187 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
188 | ||
189 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
190 | struct ip_tunnel_parm *parms) | |
191 | { | |
192 | unsigned int h; | |
193 | __be32 remote; | |
6d608f06 | 194 | __be32 i_key = parms->i_key; |
c5441932 PS |
195 | |
196 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
197 | remote = parms->iph.daddr; | |
198 | else | |
199 | remote = 0; | |
200 | ||
6d608f06 SK |
201 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
202 | i_key = 0; | |
203 | ||
204 | h = ip_tunnel_hash(i_key, remote); | |
c5441932 PS |
205 | return &itn->tunnels[h]; |
206 | } | |
207 | ||
208 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
209 | { | |
210 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
211 | ||
2e15ea39 PS |
212 | if (t->collect_md) |
213 | rcu_assign_pointer(itn->collect_md_tun, t); | |
c5441932 PS |
214 | hlist_add_head_rcu(&t->hash_node, head); |
215 | } | |
216 | ||
2e15ea39 | 217 | static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
c5441932 | 218 | { |
2e15ea39 PS |
219 | if (t->collect_md) |
220 | rcu_assign_pointer(itn->collect_md_tun, NULL); | |
c5441932 PS |
221 | hlist_del_init_rcu(&t->hash_node); |
222 | } | |
223 | ||
224 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
225 | struct ip_tunnel_parm *parms, | |
226 | int type) | |
227 | { | |
228 | __be32 remote = parms->iph.daddr; | |
229 | __be32 local = parms->iph.saddr; | |
230 | __be32 key = parms->i_key; | |
5ce54af1 | 231 | __be16 flags = parms->i_flags; |
c5441932 PS |
232 | int link = parms->link; |
233 | struct ip_tunnel *t = NULL; | |
234 | struct hlist_head *head = ip_bucket(itn, parms); | |
235 | ||
236 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
237 | if (local == t->parms.iph.saddr && | |
238 | remote == t->parms.iph.daddr && | |
c5441932 | 239 | link == t->parms.link && |
5ce54af1 DP |
240 | type == t->dev->type && |
241 | ip_tunnel_key_match(&t->parms, flags, key)) | |
c5441932 PS |
242 | break; |
243 | } | |
244 | return t; | |
245 | } | |
246 | ||
247 | static struct net_device *__ip_tunnel_create(struct net *net, | |
248 | const struct rtnl_link_ops *ops, | |
249 | struct ip_tunnel_parm *parms) | |
250 | { | |
251 | int err; | |
252 | struct ip_tunnel *tunnel; | |
253 | struct net_device *dev; | |
254 | char name[IFNAMSIZ]; | |
255 | ||
9cb726a2 ED |
256 | err = -E2BIG; |
257 | if (parms->name[0]) { | |
258 | if (!dev_valid_name(parms->name)) | |
259 | goto failed; | |
c5441932 | 260 | strlcpy(name, parms->name, IFNAMSIZ); |
9cb726a2 ED |
261 | } else { |
262 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) | |
c5441932 | 263 | goto failed; |
000ade80 SA |
264 | strcpy(name, ops->kind); |
265 | strcat(name, "%d"); | |
c5441932 PS |
266 | } |
267 | ||
268 | ASSERT_RTNL(); | |
c835a677 | 269 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
c5441932 PS |
270 | if (!dev) { |
271 | err = -ENOMEM; | |
272 | goto failed; | |
273 | } | |
274 | dev_net_set(dev, net); | |
275 | ||
276 | dev->rtnl_link_ops = ops; | |
277 | ||
278 | tunnel = netdev_priv(dev); | |
279 | tunnel->parms = *parms; | |
5e6700b3 | 280 | tunnel->net = net; |
c5441932 PS |
281 | |
282 | err = register_netdevice(dev); | |
283 | if (err) | |
284 | goto failed_free; | |
285 | ||
286 | return dev; | |
287 | ||
288 | failed_free: | |
289 | free_netdev(dev); | |
290 | failed: | |
291 | return ERR_PTR(err); | |
292 | } | |
293 | ||
c5441932 PS |
294 | static int ip_tunnel_bind_dev(struct net_device *dev) |
295 | { | |
296 | struct net_device *tdev = NULL; | |
297 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
298 | const struct iphdr *iph; | |
299 | int hlen = LL_MAX_HEADER; | |
300 | int mtu = ETH_DATA_LEN; | |
301 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
302 | ||
303 | iph = &tunnel->parms.iph; | |
304 | ||
305 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
306 | if (iph->daddr) { | |
307 | struct flowi4 fl4; | |
308 | struct rtable *rt; | |
309 | ||
b0066da5 PM |
310 | ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr, |
311 | iph->saddr, tunnel->parms.o_key, | |
312 | RT_TOS(iph->tos), tunnel->parms.link, | |
313 | tunnel->fwmark); | |
7d442fab TH |
314 | rt = ip_route_output_key(tunnel->net, &fl4); |
315 | ||
c5441932 PS |
316 | if (!IS_ERR(rt)) { |
317 | tdev = rt->dst.dev; | |
318 | ip_rt_put(rt); | |
319 | } | |
320 | if (dev->type != ARPHRD_ETHER) | |
321 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
322 | |
323 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
324 | } |
325 | ||
326 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 327 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
328 | |
329 | if (tdev) { | |
330 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
82612de1 | 331 | mtu = min(tdev->mtu, IP_MAX_MTU); |
c5441932 | 332 | } |
c5441932 PS |
333 | |
334 | dev->needed_headroom = t_hlen + hlen; | |
335 | mtu -= (dev->hard_header_len + t_hlen); | |
336 | ||
b5476022 ED |
337 | if (mtu < IPV4_MIN_MTU) |
338 | mtu = IPV4_MIN_MTU; | |
c5441932 PS |
339 | |
340 | return mtu; | |
341 | } | |
342 | ||
343 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
344 | struct ip_tunnel_net *itn, | |
345 | struct ip_tunnel_parm *parms) | |
346 | { | |
4929fd8c | 347 | struct ip_tunnel *nt; |
c5441932 | 348 | struct net_device *dev; |
b96f9afe | 349 | int t_hlen; |
f6cc9c05 PM |
350 | int mtu; |
351 | int err; | |
c5441932 | 352 | |
79134e6c | 353 | dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms); |
c5441932 | 354 | if (IS_ERR(dev)) |
6dd3c9ec | 355 | return ERR_CAST(dev); |
c5441932 | 356 | |
f6cc9c05 PM |
357 | mtu = ip_tunnel_bind_dev(dev); |
358 | err = dev_set_mtu(dev, mtu); | |
359 | if (err) | |
360 | goto err_dev_set_mtu; | |
c5441932 PS |
361 | |
362 | nt = netdev_priv(dev); | |
b96f9afe JW |
363 | t_hlen = nt->hlen + sizeof(struct iphdr); |
364 | dev->min_mtu = ETH_MIN_MTU; | |
82612de1 | 365 | dev->max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen; |
c5441932 PS |
366 | ip_tunnel_add(itn, nt); |
367 | return nt; | |
f6cc9c05 PM |
368 | |
369 | err_dev_set_mtu: | |
370 | unregister_netdevice(dev); | |
371 | return ERR_PTR(err); | |
c5441932 PS |
372 | } |
373 | ||
374 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
375 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
376 | bool log_ecn_error) | |
c5441932 | 377 | { |
8f84985f | 378 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
379 | const struct iphdr *iph = ip_hdr(skb); |
380 | int err; | |
381 | ||
c5441932 PS |
382 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
383 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
384 | tunnel->dev->stats.multicast++; |
385 | skb->pkt_type = PACKET_BROADCAST; | |
386 | } | |
387 | #endif | |
388 | ||
389 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
390 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
391 | tunnel->dev->stats.rx_crc_errors++; | |
392 | tunnel->dev->stats.rx_errors++; | |
393 | goto drop; | |
394 | } | |
395 | ||
396 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
397 | if (!(tpi->flags&TUNNEL_SEQ) || | |
398 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
399 | tunnel->dev->stats.rx_fifo_errors++; | |
400 | tunnel->dev->stats.rx_errors++; | |
401 | goto drop; | |
402 | } | |
403 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
404 | } | |
405 | ||
e96f2e7c YC |
406 | skb_reset_network_header(skb); |
407 | ||
c5441932 PS |
408 | err = IP_ECN_decapsulate(iph, skb); |
409 | if (unlikely(err)) { | |
410 | if (log_ecn_error) | |
411 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
412 | &iph->saddr, iph->tos); | |
413 | if (err > 1) { | |
414 | ++tunnel->dev->stats.rx_frame_errors; | |
415 | ++tunnel->dev->stats.rx_errors; | |
416 | goto drop; | |
417 | } | |
418 | } | |
419 | ||
420 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
421 | u64_stats_update_begin(&tstats->syncp); | |
422 | tstats->rx_packets++; | |
423 | tstats->rx_bytes += skb->len; | |
424 | u64_stats_update_end(&tstats->syncp); | |
425 | ||
81b9eab5 AS |
426 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
427 | ||
3d7b46cd PS |
428 | if (tunnel->dev->type == ARPHRD_ETHER) { |
429 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
430 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
431 | } else { | |
432 | skb->dev = tunnel->dev; | |
433 | } | |
64261f23 | 434 | |
2e15ea39 PS |
435 | if (tun_dst) |
436 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
437 | ||
c5441932 PS |
438 | gro_cells_receive(&tunnel->gro_cells, skb); |
439 | return 0; | |
440 | ||
441 | drop: | |
469f87e1 HY |
442 | if (tun_dst) |
443 | dst_release((struct dst_entry *)tun_dst); | |
c5441932 PS |
444 | kfree_skb(skb); |
445 | return 0; | |
446 | } | |
447 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
448 | ||
a8c5f90f TH |
449 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
450 | unsigned int num) | |
451 | { | |
bb1553c8 TG |
452 | if (num >= MAX_IPTUN_ENCAP_OPS) |
453 | return -ERANGE; | |
454 | ||
a8c5f90f TH |
455 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
456 | &iptun_encaps[num], | |
457 | NULL, ops) ? 0 : -1; | |
56328486 | 458 | } |
a8c5f90f TH |
459 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
460 | ||
461 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
462 | unsigned int num) | |
463 | { | |
464 | int ret; | |
465 | ||
bb1553c8 TG |
466 | if (num >= MAX_IPTUN_ENCAP_OPS) |
467 | return -ERANGE; | |
468 | ||
a8c5f90f TH |
469 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
470 | &iptun_encaps[num], | |
471 | ops, NULL) == ops) ? 0 : -1; | |
472 | ||
473 | synchronize_net(); | |
474 | ||
475 | return ret; | |
476 | } | |
477 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
478 | |
479 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
480 | struct ip_tunnel_encap *ipencap) | |
481 | { | |
482 | int hlen; | |
483 | ||
484 | memset(&t->encap, 0, sizeof(t->encap)); | |
485 | ||
486 | hlen = ip_encap_hlen(ipencap); | |
487 | if (hlen < 0) | |
488 | return hlen; | |
489 | ||
490 | t->encap.type = ipencap->type; | |
491 | t->encap.sport = ipencap->sport; | |
492 | t->encap.dport = ipencap->dport; | |
493 | t->encap.flags = ipencap->flags; | |
494 | ||
495 | t->encap_hlen = hlen; | |
496 | t->hlen = t->encap_hlen + t->tun_hlen; | |
497 | ||
498 | return 0; | |
499 | } | |
500 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
501 | ||
23a3647b | 502 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 TT |
503 | struct rtable *rt, __be16 df, |
504 | const struct iphdr *inner_iph) | |
23a3647b PS |
505 | { |
506 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 507 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
508 | int mtu; |
509 | ||
510 | if (df) | |
511 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
512 | - sizeof(struct iphdr) - tunnel->hlen; | |
513 | else | |
514 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
515 | ||
f15ca723 | 516 | skb_dst_update_pmtu(skb, mtu); |
23a3647b PS |
517 | |
518 | if (skb->protocol == htons(ETH_P_IP)) { | |
519 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
520 | (inner_iph->frag_off & htons(IP_DF)) && |
521 | mtu < pkt_size) { | |
23a3647b PS |
522 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
523 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
524 | return -E2BIG; | |
525 | } | |
526 | } | |
527 | #if IS_ENABLED(CONFIG_IPV6) | |
528 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
529 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
530 | ||
531 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
532 | mtu >= IPV6_MIN_MTU) { | |
533 | if ((tunnel->parms.iph.daddr && | |
534 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
535 | rt6->rt6i_dst.plen == 128) { | |
536 | rt6->rt6i_flags |= RTF_MODIFIED; | |
537 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
538 | } | |
539 | } | |
540 | ||
541 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
542 | mtu < pkt_size) { | |
543 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
544 | return -E2BIG; | |
545 | } | |
546 | } | |
547 | #endif | |
548 | return 0; | |
549 | } | |
550 | ||
cfc7381b AS |
551 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, u8 proto) |
552 | { | |
553 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
554 | u32 headroom = sizeof(struct iphdr); | |
555 | struct ip_tunnel_info *tun_info; | |
556 | const struct ip_tunnel_key *key; | |
557 | const struct iphdr *inner_iph; | |
558 | struct rtable *rt; | |
559 | struct flowi4 fl4; | |
560 | __be16 df = 0; | |
561 | u8 tos, ttl; | |
562 | ||
563 | tun_info = skb_tunnel_info(skb); | |
564 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
565 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
566 | goto tx_error; | |
567 | key = &tun_info->key; | |
568 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
569 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
570 | tos = key->tos; | |
571 | if (tos == 1) { | |
572 | if (skb->protocol == htons(ETH_P_IP)) | |
573 | tos = inner_iph->tos; | |
574 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
575 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
576 | } | |
b0066da5 PM |
577 | ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, 0, |
578 | RT_TOS(tos), tunnel->parms.link, tunnel->fwmark); | |
cfc7381b AS |
579 | if (tunnel->encap.type != TUNNEL_ENCAP_NONE) |
580 | goto tx_error; | |
581 | rt = ip_route_output_key(tunnel->net, &fl4); | |
582 | if (IS_ERR(rt)) { | |
583 | dev->stats.tx_carrier_errors++; | |
584 | goto tx_error; | |
585 | } | |
586 | if (rt->dst.dev == dev) { | |
587 | ip_rt_put(rt); | |
588 | dev->stats.collisions++; | |
589 | goto tx_error; | |
590 | } | |
591 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); | |
592 | ttl = key->ttl; | |
593 | if (ttl == 0) { | |
594 | if (skb->protocol == htons(ETH_P_IP)) | |
595 | ttl = inner_iph->ttl; | |
596 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
597 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
598 | else | |
599 | ttl = ip4_dst_hoplimit(&rt->dst); | |
600 | } | |
601 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
602 | df = htons(IP_DF); | |
603 | else if (skb->protocol == htons(ETH_P_IP)) | |
604 | df = inner_iph->frag_off & htons(IP_DF); | |
605 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; | |
606 | if (headroom > dev->needed_headroom) | |
607 | dev->needed_headroom = headroom; | |
608 | ||
609 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
610 | ip_rt_put(rt); | |
611 | goto tx_dropped; | |
612 | } | |
0f693f19 HY |
613 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, |
614 | df, !net_eq(tunnel->net, dev_net(dev))); | |
cfc7381b AS |
615 | return; |
616 | tx_error: | |
617 | dev->stats.tx_errors++; | |
618 | goto kfree; | |
619 | tx_dropped: | |
620 | dev->stats.tx_dropped++; | |
621 | kfree: | |
622 | kfree_skb(skb); | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); | |
625 | ||
c5441932 | 626 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 627 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
628 | { |
629 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
630 | const struct iphdr *inner_iph; | |
c5441932 PS |
631 | struct flowi4 fl4; |
632 | u8 tos, ttl; | |
633 | __be16 df; | |
b045d37b | 634 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
635 | unsigned int max_headroom; /* The extra header space needed */ |
636 | __be32 dst; | |
22fb22ea | 637 | bool connected; |
c5441932 PS |
638 | |
639 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 640 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 641 | |
5146d1f1 BH |
642 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
643 | ||
c5441932 PS |
644 | dst = tnl_params->daddr; |
645 | if (dst == 0) { | |
646 | /* NBMA tunnel */ | |
647 | ||
51456b29 | 648 | if (!skb_dst(skb)) { |
c5441932 PS |
649 | dev->stats.tx_fifo_errors++; |
650 | goto tx_error; | |
651 | } | |
652 | ||
653 | if (skb->protocol == htons(ETH_P_IP)) { | |
654 | rt = skb_rtable(skb); | |
655 | dst = rt_nexthop(rt, inner_iph->daddr); | |
656 | } | |
657 | #if IS_ENABLED(CONFIG_IPV6) | |
658 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
659 | const struct in6_addr *addr6; | |
660 | struct neighbour *neigh; | |
661 | bool do_tx_error_icmp; | |
662 | int addr_type; | |
663 | ||
664 | neigh = dst_neigh_lookup(skb_dst(skb), | |
665 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 666 | if (!neigh) |
c5441932 PS |
667 | goto tx_error; |
668 | ||
669 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
670 | addr_type = ipv6_addr_type(addr6); | |
671 | ||
672 | if (addr_type == IPV6_ADDR_ANY) { | |
673 | addr6 = &ipv6_hdr(skb)->daddr; | |
674 | addr_type = ipv6_addr_type(addr6); | |
675 | } | |
676 | ||
677 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
678 | do_tx_error_icmp = true; | |
679 | else { | |
680 | do_tx_error_icmp = false; | |
681 | dst = addr6->s6_addr32[3]; | |
682 | } | |
683 | neigh_release(neigh); | |
684 | if (do_tx_error_icmp) | |
685 | goto tx_error_icmp; | |
686 | } | |
687 | #endif | |
688 | else | |
689 | goto tx_error; | |
7d442fab TH |
690 | |
691 | connected = false; | |
c5441932 PS |
692 | } |
693 | ||
694 | tos = tnl_params->tos; | |
695 | if (tos & 0x1) { | |
696 | tos &= ~0x1; | |
7d442fab | 697 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 698 | tos = inner_iph->tos; |
7d442fab TH |
699 | connected = false; |
700 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 701 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
702 | connected = false; |
703 | } | |
c5441932 PS |
704 | } |
705 | ||
0f3e9c97 DM |
706 | ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr, |
707 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link, | |
708 | tunnel->fwmark); | |
7d442fab | 709 | |
56328486 TH |
710 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
711 | goto tx_error; | |
712 | ||
e09acddf PA |
713 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : |
714 | NULL; | |
7d442fab TH |
715 | |
716 | if (!rt) { | |
717 | rt = ip_route_output_key(tunnel->net, &fl4); | |
718 | ||
719 | if (IS_ERR(rt)) { | |
720 | dev->stats.tx_carrier_errors++; | |
721 | goto tx_error; | |
722 | } | |
723 | if (connected) | |
e09acddf PA |
724 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
725 | fl4.saddr); | |
c5441932 | 726 | } |
7d442fab | 727 | |
0e6fbc5b | 728 | if (rt->dst.dev == dev) { |
c5441932 PS |
729 | ip_rt_put(rt); |
730 | dev->stats.collisions++; | |
731 | goto tx_error; | |
732 | } | |
c5441932 | 733 | |
fc24f2b2 | 734 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph)) { |
23a3647b PS |
735 | ip_rt_put(rt); |
736 | goto tx_error; | |
c5441932 | 737 | } |
c5441932 PS |
738 | |
739 | if (tunnel->err_count > 0) { | |
740 | if (time_before(jiffies, | |
741 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
742 | tunnel->err_count--; | |
743 | ||
744 | dst_link_failure(skb); | |
745 | } else | |
746 | tunnel->err_count = 0; | |
747 | } | |
748 | ||
d4a71b15 | 749 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
750 | ttl = tnl_params->ttl; |
751 | if (ttl == 0) { | |
752 | if (skb->protocol == htons(ETH_P_IP)) | |
753 | ttl = inner_iph->ttl; | |
754 | #if IS_ENABLED(CONFIG_IPV6) | |
755 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
756 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
757 | #endif | |
758 | else | |
759 | ttl = ip4_dst_hoplimit(&rt->dst); | |
760 | } | |
761 | ||
23a3647b | 762 | df = tnl_params->frag_off; |
22a59be8 | 763 | if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
23a3647b PS |
764 | df |= (inner_iph->frag_off&htons(IP_DF)); |
765 | ||
0e6fbc5b | 766 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 767 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 768 | if (max_headroom > dev->needed_headroom) |
c5441932 | 769 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
770 | |
771 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 772 | ip_rt_put(rt); |
3e08f4a7 | 773 | dev->stats.tx_dropped++; |
3acfa1e7 | 774 | kfree_skb(skb); |
3e08f4a7 | 775 | return; |
c5441932 PS |
776 | } |
777 | ||
039f5062 PS |
778 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
779 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
780 | return; |
781 | ||
782 | #if IS_ENABLED(CONFIG_IPV6) | |
783 | tx_error_icmp: | |
784 | dst_link_failure(skb); | |
785 | #endif | |
786 | tx_error: | |
787 | dev->stats.tx_errors++; | |
3acfa1e7 | 788 | kfree_skb(skb); |
c5441932 PS |
789 | } |
790 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
791 | ||
792 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
793 | struct ip_tunnel *t, | |
794 | struct net_device *dev, | |
795 | struct ip_tunnel_parm *p, | |
9830ad4c CG |
796 | bool set_mtu, |
797 | __u32 fwmark) | |
c5441932 | 798 | { |
2e15ea39 | 799 | ip_tunnel_del(itn, t); |
c5441932 PS |
800 | t->parms.iph.saddr = p->iph.saddr; |
801 | t->parms.iph.daddr = p->iph.daddr; | |
802 | t->parms.i_key = p->i_key; | |
803 | t->parms.o_key = p->o_key; | |
804 | if (dev->type != ARPHRD_ETHER) { | |
805 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
806 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
807 | } | |
808 | ip_tunnel_add(itn, t); | |
809 | ||
810 | t->parms.iph.ttl = p->iph.ttl; | |
811 | t->parms.iph.tos = p->iph.tos; | |
812 | t->parms.iph.frag_off = p->iph.frag_off; | |
813 | ||
9830ad4c | 814 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
c5441932 PS |
815 | int mtu; |
816 | ||
817 | t->parms.link = p->link; | |
9830ad4c | 818 | t->fwmark = fwmark; |
c5441932 PS |
819 | mtu = ip_tunnel_bind_dev(dev); |
820 | if (set_mtu) | |
821 | dev->mtu = mtu; | |
822 | } | |
e09acddf | 823 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
824 | netdev_state_change(dev); |
825 | } | |
826 | ||
827 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
828 | { | |
829 | int err = 0; | |
8c923ce2 ND |
830 | struct ip_tunnel *t = netdev_priv(dev); |
831 | struct net *net = t->net; | |
832 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 | 833 | |
c5441932 PS |
834 | switch (cmd) { |
835 | case SIOCGETTUNNEL: | |
8c923ce2 | 836 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 837 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 838 | if (!t) |
8c923ce2 ND |
839 | t = netdev_priv(dev); |
840 | } | |
c5441932 PS |
841 | memcpy(p, &t->parms, sizeof(*p)); |
842 | break; | |
843 | ||
844 | case SIOCADDTUNNEL: | |
845 | case SIOCCHGTUNNEL: | |
846 | err = -EPERM; | |
847 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
848 | goto done; | |
849 | if (p->iph.ttl) | |
850 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
851 | if (!(p->i_flags & VTI_ISVTI)) { |
852 | if (!(p->i_flags & TUNNEL_KEY)) | |
853 | p->i_key = 0; | |
854 | if (!(p->o_flags & TUNNEL_KEY)) | |
855 | p->o_key = 0; | |
856 | } | |
c5441932 | 857 | |
79134e6c | 858 | t = ip_tunnel_find(itn, p, itn->type); |
c5441932 | 859 | |
d61746b2 SK |
860 | if (cmd == SIOCADDTUNNEL) { |
861 | if (!t) { | |
862 | t = ip_tunnel_create(net, itn, p); | |
863 | err = PTR_ERR_OR_ZERO(t); | |
864 | break; | |
865 | } | |
866 | ||
867 | err = -EEXIST; | |
ee30ef4d | 868 | break; |
6dd3c9ec | 869 | } |
c5441932 | 870 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 871 | if (t) { |
c5441932 PS |
872 | if (t->dev != dev) { |
873 | err = -EEXIST; | |
874 | break; | |
875 | } | |
876 | } else { | |
877 | unsigned int nflags = 0; | |
878 | ||
879 | if (ipv4_is_multicast(p->iph.daddr)) | |
880 | nflags = IFF_BROADCAST; | |
881 | else if (p->iph.daddr) | |
882 | nflags = IFF_POINTOPOINT; | |
883 | ||
884 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
885 | err = -EINVAL; | |
886 | break; | |
887 | } | |
888 | ||
889 | t = netdev_priv(dev); | |
890 | } | |
891 | } | |
892 | ||
893 | if (t) { | |
894 | err = 0; | |
9830ad4c | 895 | ip_tunnel_update(itn, t, dev, p, true, 0); |
6dd3c9ec FW |
896 | } else { |
897 | err = -ENOENT; | |
898 | } | |
c5441932 PS |
899 | break; |
900 | ||
901 | case SIOCDELTUNNEL: | |
902 | err = -EPERM; | |
903 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
904 | goto done; | |
905 | ||
906 | if (dev == itn->fb_tunnel_dev) { | |
907 | err = -ENOENT; | |
908 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 909 | if (!t) |
c5441932 PS |
910 | goto done; |
911 | err = -EPERM; | |
912 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
913 | goto done; | |
914 | dev = t->dev; | |
915 | } | |
916 | unregister_netdevice(dev); | |
917 | err = 0; | |
918 | break; | |
919 | ||
920 | default: | |
921 | err = -EINVAL; | |
922 | } | |
923 | ||
924 | done: | |
925 | return err; | |
926 | } | |
927 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
928 | ||
7e059158 | 929 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
930 | { |
931 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
932 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
82612de1 | 933 | int max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen; |
c5441932 | 934 | |
b96f9afe | 935 | if (new_mtu < ETH_MIN_MTU) |
c5441932 | 936 | return -EINVAL; |
7e059158 DW |
937 | |
938 | if (new_mtu > max_mtu) { | |
939 | if (strict) | |
940 | return -EINVAL; | |
941 | ||
942 | new_mtu = max_mtu; | |
943 | } | |
944 | ||
c5441932 PS |
945 | dev->mtu = new_mtu; |
946 | return 0; | |
947 | } | |
7e059158 DW |
948 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
949 | ||
950 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
951 | { | |
952 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
953 | } | |
c5441932 PS |
954 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
955 | ||
956 | static void ip_tunnel_dev_free(struct net_device *dev) | |
957 | { | |
958 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
959 | ||
960 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 961 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 | 962 | free_percpu(dev->tstats); |
c5441932 PS |
963 | } |
964 | ||
965 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
966 | { | |
c5441932 PS |
967 | struct ip_tunnel *tunnel = netdev_priv(dev); |
968 | struct ip_tunnel_net *itn; | |
969 | ||
6c742e71 | 970 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
971 | |
972 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 973 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
974 | unregister_netdevice_queue(dev, head); |
975 | } | |
976 | } | |
977 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
978 | ||
1728d4fa ND |
979 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
980 | { | |
981 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
982 | ||
983 | return tunnel->net; | |
984 | } | |
985 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
986 | ||
1e99584b ND |
987 | int ip_tunnel_get_iflink(const struct net_device *dev) |
988 | { | |
989 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
990 | ||
991 | return tunnel->parms.link; | |
992 | } | |
993 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
994 | ||
c7d03a00 | 995 | int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
c5441932 PS |
996 | struct rtnl_link_ops *ops, char *devname) |
997 | { | |
998 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
999 | struct ip_tunnel_parm parms; | |
6261d983 | 1000 | unsigned int i; |
c5441932 | 1001 | |
79134e6c | 1002 | itn->rtnl_link_ops = ops; |
6261d983 | 1003 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
1004 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 | 1005 | |
79134e6c ED |
1006 | if (!ops || !net_has_fallback_tunnels(net)) { |
1007 | struct ip_tunnel_net *it_init_net; | |
1008 | ||
1009 | it_init_net = net_generic(&init_net, ip_tnl_net_id); | |
1010 | itn->type = it_init_net->type; | |
c5441932 PS |
1011 | itn->fb_tunnel_dev = NULL; |
1012 | return 0; | |
1013 | } | |
6261d983 | 1014 | |
c5441932 PS |
1015 | memset(&parms, 0, sizeof(parms)); |
1016 | if (devname) | |
1017 | strlcpy(parms.name, devname, IFNAMSIZ); | |
1018 | ||
1019 | rtnl_lock(); | |
1020 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
1021 | /* FB netdevice is special: we have one, and only one per netns. |
1022 | * Allowing to move it to another netns is clearly unsafe. | |
1023 | */ | |
67013282 | 1024 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 1025 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 1026 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 | 1027 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
79134e6c | 1028 | itn->type = itn->fb_tunnel_dev->type; |
67013282 | 1029 | } |
b4de77ad | 1030 | rtnl_unlock(); |
c5441932 | 1031 | |
27d79f3b | 1032 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
1033 | } |
1034 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
1035 | ||
79134e6c ED |
1036 | static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn, |
1037 | struct list_head *head, | |
6c742e71 | 1038 | struct rtnl_link_ops *ops) |
c5441932 | 1039 | { |
6c742e71 | 1040 | struct net_device *dev, *aux; |
c5441932 PS |
1041 | int h; |
1042 | ||
6c742e71 ND |
1043 | for_each_netdev_safe(net, dev, aux) |
1044 | if (dev->rtnl_link_ops == ops) | |
1045 | unregister_netdevice_queue(dev, head); | |
1046 | ||
c5441932 PS |
1047 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1048 | struct ip_tunnel *t; | |
1049 | struct hlist_node *n; | |
1050 | struct hlist_head *thead = &itn->tunnels[h]; | |
1051 | ||
1052 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
1053 | /* If dev is in the same netns, it has already |
1054 | * been added to the list by the previous loop. | |
1055 | */ | |
1056 | if (!net_eq(dev_net(t->dev), net)) | |
1057 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 1058 | } |
c5441932 PS |
1059 | } |
1060 | ||
64bc1781 ED |
1061 | void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id, |
1062 | struct rtnl_link_ops *ops) | |
c5441932 | 1063 | { |
64bc1781 ED |
1064 | struct ip_tunnel_net *itn; |
1065 | struct net *net; | |
c5441932 PS |
1066 | LIST_HEAD(list); |
1067 | ||
1068 | rtnl_lock(); | |
64bc1781 ED |
1069 | list_for_each_entry(net, net_list, exit_list) { |
1070 | itn = net_generic(net, id); | |
79134e6c | 1071 | ip_tunnel_destroy(net, itn, &list, ops); |
64bc1781 | 1072 | } |
c5441932 PS |
1073 | unregister_netdevice_many(&list); |
1074 | rtnl_unlock(); | |
c5441932 | 1075 | } |
64bc1781 | 1076 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets); |
c5441932 PS |
1077 | |
1078 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1079 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 PS |
1080 | { |
1081 | struct ip_tunnel *nt; | |
1082 | struct net *net = dev_net(dev); | |
1083 | struct ip_tunnel_net *itn; | |
1084 | int mtu; | |
1085 | int err; | |
1086 | ||
1087 | nt = netdev_priv(dev); | |
1088 | itn = net_generic(net, nt->ip_tnl_net_id); | |
1089 | ||
2e15ea39 PS |
1090 | if (nt->collect_md) { |
1091 | if (rtnl_dereference(itn->collect_md_tun)) | |
1092 | return -EEXIST; | |
1093 | } else { | |
1094 | if (ip_tunnel_find(itn, p, dev->type)) | |
1095 | return -EEXIST; | |
1096 | } | |
c5441932 | 1097 | |
5e6700b3 | 1098 | nt->net = net; |
c5441932 | 1099 | nt->parms = *p; |
9830ad4c | 1100 | nt->fwmark = fwmark; |
c5441932 PS |
1101 | err = register_netdevice(dev); |
1102 | if (err) | |
f6cc9c05 | 1103 | goto err_register_netdevice; |
c5441932 PS |
1104 | |
1105 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1106 | eth_hw_addr_random(dev); | |
1107 | ||
1108 | mtu = ip_tunnel_bind_dev(dev); | |
24fc7979 | 1109 | if (tb[IFLA_MTU]) { |
82612de1 | 1110 | unsigned int max = IP_MAX_MTU - dev->hard_header_len - nt->hlen; |
24fc7979 | 1111 | |
5568cdc3 DM |
1112 | mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, |
1113 | (unsigned int)(max - sizeof(struct iphdr))); | |
f6cc9c05 | 1114 | } |
c5441932 | 1115 | |
5568cdc3 DM |
1116 | err = dev_set_mtu(dev, mtu); |
1117 | if (err) | |
1118 | goto err_dev_set_mtu; | |
c5441932 PS |
1119 | |
1120 | ip_tunnel_add(itn, nt); | |
f6cc9c05 PM |
1121 | return 0; |
1122 | ||
1123 | err_dev_set_mtu: | |
1124 | unregister_netdevice(dev); | |
1125 | err_register_netdevice: | |
c5441932 PS |
1126 | return err; |
1127 | } | |
1128 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1129 | ||
1130 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1131 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 | 1132 | { |
6c742e71 | 1133 | struct ip_tunnel *t; |
c5441932 | 1134 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1135 | struct net *net = tunnel->net; |
c5441932 PS |
1136 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1137 | ||
1138 | if (dev == itn->fb_tunnel_dev) | |
1139 | return -EINVAL; | |
1140 | ||
c5441932 PS |
1141 | t = ip_tunnel_find(itn, p, dev->type); |
1142 | ||
1143 | if (t) { | |
1144 | if (t->dev != dev) | |
1145 | return -EEXIST; | |
1146 | } else { | |
6c742e71 | 1147 | t = tunnel; |
c5441932 PS |
1148 | |
1149 | if (dev->type != ARPHRD_ETHER) { | |
1150 | unsigned int nflags = 0; | |
1151 | ||
1152 | if (ipv4_is_multicast(p->iph.daddr)) | |
1153 | nflags = IFF_BROADCAST; | |
1154 | else if (p->iph.daddr) | |
1155 | nflags = IFF_POINTOPOINT; | |
1156 | ||
1157 | if ((dev->flags ^ nflags) & | |
1158 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1159 | return -EINVAL; | |
1160 | } | |
1161 | } | |
1162 | ||
9830ad4c | 1163 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); |
c5441932 PS |
1164 | return 0; |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1167 | ||
1168 | int ip_tunnel_init(struct net_device *dev) | |
1169 | { | |
1170 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1171 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1172 | int err; |
c5441932 | 1173 | |
cf124db5 DM |
1174 | dev->needs_free_netdev = true; |
1175 | dev->priv_destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1176 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1177 | if (!dev->tstats) |
1178 | return -ENOMEM; | |
1179 | ||
e09acddf PA |
1180 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1181 | if (err) { | |
9a4aa9af | 1182 | free_percpu(dev->tstats); |
e09acddf | 1183 | return err; |
9a4aa9af TH |
1184 | } |
1185 | ||
c5441932 PS |
1186 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1187 | if (err) { | |
e09acddf | 1188 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1189 | free_percpu(dev->tstats); |
1190 | return err; | |
1191 | } | |
1192 | ||
1193 | tunnel->dev = dev; | |
6c742e71 | 1194 | tunnel->net = dev_net(dev); |
c5441932 PS |
1195 | strcpy(tunnel->parms.name, dev->name); |
1196 | iph->version = 4; | |
1197 | iph->ihl = 5; | |
1198 | ||
2e15ea39 PS |
1199 | if (tunnel->collect_md) { |
1200 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1201 | netif_keep_dst(dev); | |
1202 | } | |
c5441932 PS |
1203 | return 0; |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1206 | ||
1207 | void ip_tunnel_uninit(struct net_device *dev) | |
1208 | { | |
c5441932 | 1209 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1210 | struct net *net = tunnel->net; |
c5441932 PS |
1211 | struct ip_tunnel_net *itn; |
1212 | ||
1213 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1214 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1215 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1216 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1217 | |
e09acddf | 1218 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1219 | } |
1220 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1221 | ||
1222 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
c7d03a00 | 1223 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c5441932 PS |
1224 | { |
1225 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1226 | tunnel->ip_tnl_net_id = net_id; | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1229 | ||
1230 | MODULE_LICENSE("GPL"); |