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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 | ||
8861e840 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); |
8861e840 ED |
261 | } else { |
262 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) | |
c5441932 | 263 | goto failed; |
1b239929 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 | ||
7d442fab TH |
294 | static inline void init_tunnel_flow(struct flowi4 *fl4, |
295 | int proto, | |
296 | __be32 daddr, __be32 saddr, | |
9830ad4c CG |
297 | __be32 key, __u8 tos, int oif, |
298 | __u32 mark) | |
c5441932 PS |
299 | { |
300 | memset(fl4, 0, sizeof(*fl4)); | |
301 | fl4->flowi4_oif = oif; | |
302 | fl4->daddr = daddr; | |
303 | fl4->saddr = saddr; | |
304 | fl4->flowi4_tos = tos; | |
305 | fl4->flowi4_proto = proto; | |
306 | fl4->fl4_gre_key = key; | |
9830ad4c | 307 | fl4->flowi4_mark = mark; |
c5441932 PS |
308 | } |
309 | ||
310 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
311 | { | |
312 | struct net_device *tdev = NULL; | |
313 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
314 | const struct iphdr *iph; | |
315 | int hlen = LL_MAX_HEADER; | |
316 | int mtu = ETH_DATA_LEN; | |
317 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
318 | ||
319 | iph = &tunnel->parms.iph; | |
320 | ||
321 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
322 | if (iph->daddr) { | |
323 | struct flowi4 fl4; | |
324 | struct rtable *rt; | |
325 | ||
7d442fab TH |
326 | init_tunnel_flow(&fl4, iph->protocol, iph->daddr, |
327 | iph->saddr, tunnel->parms.o_key, | |
9830ad4c CG |
328 | RT_TOS(iph->tos), tunnel->parms.link, |
329 | tunnel->fwmark); | |
7d442fab TH |
330 | rt = ip_route_output_key(tunnel->net, &fl4); |
331 | ||
c5441932 PS |
332 | if (!IS_ERR(rt)) { |
333 | tdev = rt->dst.dev; | |
334 | ip_rt_put(rt); | |
335 | } | |
336 | if (dev->type != ARPHRD_ETHER) | |
337 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
338 | |
339 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
340 | } |
341 | ||
342 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 343 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
344 | |
345 | if (tdev) { | |
346 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
347 | mtu = tdev->mtu; | |
348 | } | |
c5441932 PS |
349 | |
350 | dev->needed_headroom = t_hlen + hlen; | |
351 | mtu -= (dev->hard_header_len + t_hlen); | |
352 | ||
b5476022 ED |
353 | if (mtu < IPV4_MIN_MTU) |
354 | mtu = IPV4_MIN_MTU; | |
c5441932 PS |
355 | |
356 | return mtu; | |
357 | } | |
358 | ||
359 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
360 | struct ip_tunnel_net *itn, | |
361 | struct ip_tunnel_parm *parms) | |
362 | { | |
4929fd8c | 363 | struct ip_tunnel *nt; |
c5441932 | 364 | struct net_device *dev; |
b96f9afe | 365 | int t_hlen; |
c5441932 PS |
366 | |
367 | BUG_ON(!itn->fb_tunnel_dev); | |
c5441932 PS |
368 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); |
369 | if (IS_ERR(dev)) | |
6dd3c9ec | 370 | return ERR_CAST(dev); |
c5441932 PS |
371 | |
372 | dev->mtu = ip_tunnel_bind_dev(dev); | |
373 | ||
374 | nt = netdev_priv(dev); | |
b96f9afe JW |
375 | t_hlen = nt->hlen + sizeof(struct iphdr); |
376 | dev->min_mtu = ETH_MIN_MTU; | |
377 | dev->max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; | |
c5441932 PS |
378 | ip_tunnel_add(itn, nt); |
379 | return nt; | |
380 | } | |
381 | ||
382 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
383 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
384 | bool log_ecn_error) | |
c5441932 | 385 | { |
8f84985f | 386 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
387 | const struct iphdr *iph = ip_hdr(skb); |
388 | int err; | |
389 | ||
c5441932 PS |
390 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
391 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
392 | tunnel->dev->stats.multicast++; |
393 | skb->pkt_type = PACKET_BROADCAST; | |
394 | } | |
395 | #endif | |
396 | ||
397 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
398 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
399 | tunnel->dev->stats.rx_crc_errors++; | |
400 | tunnel->dev->stats.rx_errors++; | |
401 | goto drop; | |
402 | } | |
403 | ||
404 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
405 | if (!(tpi->flags&TUNNEL_SEQ) || | |
406 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
407 | tunnel->dev->stats.rx_fifo_errors++; | |
408 | tunnel->dev->stats.rx_errors++; | |
409 | goto drop; | |
410 | } | |
411 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
412 | } | |
413 | ||
e96f2e7c YC |
414 | skb_reset_network_header(skb); |
415 | ||
c5441932 PS |
416 | err = IP_ECN_decapsulate(iph, skb); |
417 | if (unlikely(err)) { | |
418 | if (log_ecn_error) | |
419 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
420 | &iph->saddr, iph->tos); | |
421 | if (err > 1) { | |
422 | ++tunnel->dev->stats.rx_frame_errors; | |
423 | ++tunnel->dev->stats.rx_errors; | |
424 | goto drop; | |
425 | } | |
426 | } | |
427 | ||
428 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
429 | u64_stats_update_begin(&tstats->syncp); | |
430 | tstats->rx_packets++; | |
431 | tstats->rx_bytes += skb->len; | |
432 | u64_stats_update_end(&tstats->syncp); | |
433 | ||
81b9eab5 AS |
434 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
435 | ||
3d7b46cd PS |
436 | if (tunnel->dev->type == ARPHRD_ETHER) { |
437 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
438 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
439 | } else { | |
440 | skb->dev = tunnel->dev; | |
441 | } | |
64261f23 | 442 | |
2e15ea39 PS |
443 | if (tun_dst) |
444 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
445 | ||
c5441932 PS |
446 | gro_cells_receive(&tunnel->gro_cells, skb); |
447 | return 0; | |
448 | ||
449 | drop: | |
469f87e1 HY |
450 | if (tun_dst) |
451 | dst_release((struct dst_entry *)tun_dst); | |
c5441932 PS |
452 | kfree_skb(skb); |
453 | return 0; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
456 | ||
a8c5f90f TH |
457 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
458 | unsigned int num) | |
459 | { | |
bb1553c8 TG |
460 | if (num >= MAX_IPTUN_ENCAP_OPS) |
461 | return -ERANGE; | |
462 | ||
a8c5f90f TH |
463 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
464 | &iptun_encaps[num], | |
465 | NULL, ops) ? 0 : -1; | |
56328486 | 466 | } |
a8c5f90f TH |
467 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
468 | ||
469 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
470 | unsigned int num) | |
471 | { | |
472 | int ret; | |
473 | ||
bb1553c8 TG |
474 | if (num >= MAX_IPTUN_ENCAP_OPS) |
475 | return -ERANGE; | |
476 | ||
a8c5f90f TH |
477 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
478 | &iptun_encaps[num], | |
479 | ops, NULL) == ops) ? 0 : -1; | |
480 | ||
481 | synchronize_net(); | |
482 | ||
483 | return ret; | |
484 | } | |
485 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
486 | |
487 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
488 | struct ip_tunnel_encap *ipencap) | |
489 | { | |
490 | int hlen; | |
491 | ||
492 | memset(&t->encap, 0, sizeof(t->encap)); | |
493 | ||
494 | hlen = ip_encap_hlen(ipencap); | |
495 | if (hlen < 0) | |
496 | return hlen; | |
497 | ||
498 | t->encap.type = ipencap->type; | |
499 | t->encap.sport = ipencap->sport; | |
500 | t->encap.dport = ipencap->dport; | |
501 | t->encap.flags = ipencap->flags; | |
502 | ||
503 | t->encap_hlen = hlen; | |
504 | t->hlen = t->encap_hlen + t->tun_hlen; | |
505 | ||
506 | return 0; | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
509 | ||
23a3647b | 510 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 TT |
511 | struct rtable *rt, __be16 df, |
512 | const struct iphdr *inner_iph) | |
23a3647b PS |
513 | { |
514 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 515 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
516 | int mtu; |
517 | ||
518 | if (df) | |
519 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
520 | - sizeof(struct iphdr) - tunnel->hlen; | |
521 | else | |
522 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
523 | ||
55d80deb | 524 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
23a3647b PS |
525 | |
526 | if (skb->protocol == htons(ETH_P_IP)) { | |
527 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
528 | (inner_iph->frag_off & htons(IP_DF)) && |
529 | mtu < pkt_size) { | |
23a3647b PS |
530 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
531 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
532 | return -E2BIG; | |
533 | } | |
534 | } | |
535 | #if IS_ENABLED(CONFIG_IPV6) | |
536 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
537 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
538 | ||
539 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
540 | mtu >= IPV6_MIN_MTU) { | |
541 | if ((tunnel->parms.iph.daddr && | |
542 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
543 | rt6->rt6i_dst.plen == 128) { | |
544 | rt6->rt6i_flags |= RTF_MODIFIED; | |
545 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
546 | } | |
547 | } | |
548 | ||
549 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
550 | mtu < pkt_size) { | |
551 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
552 | return -E2BIG; | |
553 | } | |
554 | } | |
555 | #endif | |
556 | return 0; | |
557 | } | |
558 | ||
cfc7381b AS |
559 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, u8 proto) |
560 | { | |
561 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
562 | u32 headroom = sizeof(struct iphdr); | |
563 | struct ip_tunnel_info *tun_info; | |
564 | const struct ip_tunnel_key *key; | |
565 | const struct iphdr *inner_iph; | |
566 | struct rtable *rt; | |
567 | struct flowi4 fl4; | |
568 | __be16 df = 0; | |
569 | u8 tos, ttl; | |
570 | ||
571 | tun_info = skb_tunnel_info(skb); | |
572 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
573 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
574 | goto tx_error; | |
575 | key = &tun_info->key; | |
576 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
577 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
578 | tos = key->tos; | |
579 | if (tos == 1) { | |
580 | if (skb->protocol == htons(ETH_P_IP)) | |
581 | tos = inner_iph->tos; | |
582 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
583 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
584 | } | |
585 | init_tunnel_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, 0, | |
9830ad4c | 586 | RT_TOS(tos), tunnel->parms.link, tunnel->fwmark); |
cfc7381b AS |
587 | if (tunnel->encap.type != TUNNEL_ENCAP_NONE) |
588 | goto tx_error; | |
589 | rt = ip_route_output_key(tunnel->net, &fl4); | |
590 | if (IS_ERR(rt)) { | |
591 | dev->stats.tx_carrier_errors++; | |
592 | goto tx_error; | |
593 | } | |
594 | if (rt->dst.dev == dev) { | |
595 | ip_rt_put(rt); | |
596 | dev->stats.collisions++; | |
597 | goto tx_error; | |
598 | } | |
599 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); | |
600 | ttl = key->ttl; | |
601 | if (ttl == 0) { | |
602 | if (skb->protocol == htons(ETH_P_IP)) | |
603 | ttl = inner_iph->ttl; | |
604 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
605 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
606 | else | |
607 | ttl = ip4_dst_hoplimit(&rt->dst); | |
608 | } | |
609 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
610 | df = htons(IP_DF); | |
611 | else if (skb->protocol == htons(ETH_P_IP)) | |
612 | df = inner_iph->frag_off & htons(IP_DF); | |
613 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; | |
614 | if (headroom > dev->needed_headroom) | |
615 | dev->needed_headroom = headroom; | |
616 | ||
617 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
618 | ip_rt_put(rt); | |
619 | goto tx_dropped; | |
620 | } | |
0f693f19 HY |
621 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, |
622 | df, !net_eq(tunnel->net, dev_net(dev))); | |
cfc7381b AS |
623 | return; |
624 | tx_error: | |
625 | dev->stats.tx_errors++; | |
626 | goto kfree; | |
627 | tx_dropped: | |
628 | dev->stats.tx_dropped++; | |
629 | kfree: | |
630 | kfree_skb(skb); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); | |
633 | ||
c5441932 | 634 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 635 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
636 | { |
637 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
638 | const struct iphdr *inner_iph; | |
c5441932 PS |
639 | struct flowi4 fl4; |
640 | u8 tos, ttl; | |
641 | __be16 df; | |
b045d37b | 642 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
643 | unsigned int max_headroom; /* The extra header space needed */ |
644 | __be32 dst; | |
22fb22ea | 645 | bool connected; |
c5441932 PS |
646 | |
647 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 648 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 649 | |
5146d1f1 BH |
650 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
651 | ||
c5441932 PS |
652 | dst = tnl_params->daddr; |
653 | if (dst == 0) { | |
654 | /* NBMA tunnel */ | |
804b9328 | 655 | struct ip_tunnel_info *tun_info; |
c5441932 | 656 | |
51456b29 | 657 | if (!skb_dst(skb)) { |
c5441932 PS |
658 | dev->stats.tx_fifo_errors++; |
659 | goto tx_error; | |
660 | } | |
661 | ||
804b9328 | 662 | tun_info = skb_tunnel_info(skb); |
663 | if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) && | |
664 | ip_tunnel_info_af(tun_info) == AF_INET && | |
665 | tun_info->key.u.ipv4.dst) | |
666 | dst = tun_info->key.u.ipv4.dst; | |
667 | else if (skb->protocol == htons(ETH_P_IP)) { | |
c5441932 PS |
668 | rt = skb_rtable(skb); |
669 | dst = rt_nexthop(rt, inner_iph->daddr); | |
670 | } | |
671 | #if IS_ENABLED(CONFIG_IPV6) | |
672 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
673 | const struct in6_addr *addr6; | |
674 | struct neighbour *neigh; | |
675 | bool do_tx_error_icmp; | |
676 | int addr_type; | |
677 | ||
678 | neigh = dst_neigh_lookup(skb_dst(skb), | |
679 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 680 | if (!neigh) |
c5441932 PS |
681 | goto tx_error; |
682 | ||
683 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
684 | addr_type = ipv6_addr_type(addr6); | |
685 | ||
686 | if (addr_type == IPV6_ADDR_ANY) { | |
687 | addr6 = &ipv6_hdr(skb)->daddr; | |
688 | addr_type = ipv6_addr_type(addr6); | |
689 | } | |
690 | ||
691 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
692 | do_tx_error_icmp = true; | |
693 | else { | |
694 | do_tx_error_icmp = false; | |
695 | dst = addr6->s6_addr32[3]; | |
696 | } | |
697 | neigh_release(neigh); | |
698 | if (do_tx_error_icmp) | |
699 | goto tx_error_icmp; | |
700 | } | |
701 | #endif | |
702 | else | |
703 | goto tx_error; | |
7d442fab TH |
704 | |
705 | connected = false; | |
c5441932 PS |
706 | } |
707 | ||
708 | tos = tnl_params->tos; | |
709 | if (tos & 0x1) { | |
710 | tos &= ~0x1; | |
7d442fab | 711 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 712 | tos = inner_iph->tos; |
7d442fab TH |
713 | connected = false; |
714 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 715 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
716 | connected = false; |
717 | } | |
c5441932 PS |
718 | } |
719 | ||
7d442fab | 720 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
9830ad4c CG |
721 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link, |
722 | tunnel->fwmark); | |
7d442fab | 723 | |
56328486 TH |
724 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
725 | goto tx_error; | |
726 | ||
e09acddf PA |
727 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : |
728 | NULL; | |
7d442fab TH |
729 | |
730 | if (!rt) { | |
731 | rt = ip_route_output_key(tunnel->net, &fl4); | |
732 | ||
733 | if (IS_ERR(rt)) { | |
734 | dev->stats.tx_carrier_errors++; | |
735 | goto tx_error; | |
736 | } | |
737 | if (connected) | |
e09acddf PA |
738 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
739 | fl4.saddr); | |
c5441932 | 740 | } |
7d442fab | 741 | |
0e6fbc5b | 742 | if (rt->dst.dev == dev) { |
c5441932 PS |
743 | ip_rt_put(rt); |
744 | dev->stats.collisions++; | |
745 | goto tx_error; | |
746 | } | |
c5441932 | 747 | |
fc24f2b2 | 748 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph)) { |
23a3647b PS |
749 | ip_rt_put(rt); |
750 | goto tx_error; | |
c5441932 | 751 | } |
c5441932 PS |
752 | |
753 | if (tunnel->err_count > 0) { | |
754 | if (time_before(jiffies, | |
755 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
756 | tunnel->err_count--; | |
757 | ||
758 | dst_link_failure(skb); | |
759 | } else | |
760 | tunnel->err_count = 0; | |
761 | } | |
762 | ||
d4a71b15 | 763 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
764 | ttl = tnl_params->ttl; |
765 | if (ttl == 0) { | |
766 | if (skb->protocol == htons(ETH_P_IP)) | |
767 | ttl = inner_iph->ttl; | |
768 | #if IS_ENABLED(CONFIG_IPV6) | |
769 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
770 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
771 | #endif | |
772 | else | |
773 | ttl = ip4_dst_hoplimit(&rt->dst); | |
774 | } | |
775 | ||
23a3647b | 776 | df = tnl_params->frag_off; |
22a59be8 | 777 | if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
23a3647b PS |
778 | df |= (inner_iph->frag_off&htons(IP_DF)); |
779 | ||
0e6fbc5b | 780 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 781 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 782 | if (max_headroom > dev->needed_headroom) |
c5441932 | 783 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
784 | |
785 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 786 | ip_rt_put(rt); |
3e08f4a7 | 787 | dev->stats.tx_dropped++; |
3acfa1e7 | 788 | kfree_skb(skb); |
3e08f4a7 | 789 | return; |
c5441932 PS |
790 | } |
791 | ||
039f5062 PS |
792 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
793 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
794 | return; |
795 | ||
796 | #if IS_ENABLED(CONFIG_IPV6) | |
797 | tx_error_icmp: | |
798 | dst_link_failure(skb); | |
799 | #endif | |
800 | tx_error: | |
801 | dev->stats.tx_errors++; | |
3acfa1e7 | 802 | kfree_skb(skb); |
c5441932 PS |
803 | } |
804 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
805 | ||
806 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
807 | struct ip_tunnel *t, | |
808 | struct net_device *dev, | |
809 | struct ip_tunnel_parm *p, | |
9830ad4c CG |
810 | bool set_mtu, |
811 | __u32 fwmark) | |
c5441932 | 812 | { |
2e15ea39 | 813 | ip_tunnel_del(itn, t); |
c5441932 PS |
814 | t->parms.iph.saddr = p->iph.saddr; |
815 | t->parms.iph.daddr = p->iph.daddr; | |
816 | t->parms.i_key = p->i_key; | |
817 | t->parms.o_key = p->o_key; | |
818 | if (dev->type != ARPHRD_ETHER) { | |
819 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
820 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
821 | } | |
822 | ip_tunnel_add(itn, t); | |
823 | ||
824 | t->parms.iph.ttl = p->iph.ttl; | |
825 | t->parms.iph.tos = p->iph.tos; | |
826 | t->parms.iph.frag_off = p->iph.frag_off; | |
827 | ||
9830ad4c | 828 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
c5441932 PS |
829 | int mtu; |
830 | ||
831 | t->parms.link = p->link; | |
9830ad4c | 832 | t->fwmark = fwmark; |
c5441932 PS |
833 | mtu = ip_tunnel_bind_dev(dev); |
834 | if (set_mtu) | |
835 | dev->mtu = mtu; | |
836 | } | |
e09acddf | 837 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
838 | netdev_state_change(dev); |
839 | } | |
840 | ||
841 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
842 | { | |
843 | int err = 0; | |
8c923ce2 ND |
844 | struct ip_tunnel *t = netdev_priv(dev); |
845 | struct net *net = t->net; | |
846 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 PS |
847 | |
848 | BUG_ON(!itn->fb_tunnel_dev); | |
849 | switch (cmd) { | |
850 | case SIOCGETTUNNEL: | |
8c923ce2 | 851 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 852 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 853 | if (!t) |
8c923ce2 ND |
854 | t = netdev_priv(dev); |
855 | } | |
c5441932 PS |
856 | memcpy(p, &t->parms, sizeof(*p)); |
857 | break; | |
858 | ||
859 | case SIOCADDTUNNEL: | |
860 | case SIOCCHGTUNNEL: | |
861 | err = -EPERM; | |
862 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
863 | goto done; | |
864 | if (p->iph.ttl) | |
865 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
866 | if (!(p->i_flags & VTI_ISVTI)) { |
867 | if (!(p->i_flags & TUNNEL_KEY)) | |
868 | p->i_key = 0; | |
869 | if (!(p->o_flags & TUNNEL_KEY)) | |
870 | p->o_key = 0; | |
871 | } | |
c5441932 PS |
872 | |
873 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
874 | ||
d61746b2 SK |
875 | if (cmd == SIOCADDTUNNEL) { |
876 | if (!t) { | |
877 | t = ip_tunnel_create(net, itn, p); | |
878 | err = PTR_ERR_OR_ZERO(t); | |
879 | break; | |
880 | } | |
881 | ||
882 | err = -EEXIST; | |
ee30ef4d | 883 | break; |
6dd3c9ec | 884 | } |
c5441932 | 885 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 886 | if (t) { |
c5441932 PS |
887 | if (t->dev != dev) { |
888 | err = -EEXIST; | |
889 | break; | |
890 | } | |
891 | } else { | |
892 | unsigned int nflags = 0; | |
893 | ||
894 | if (ipv4_is_multicast(p->iph.daddr)) | |
895 | nflags = IFF_BROADCAST; | |
896 | else if (p->iph.daddr) | |
897 | nflags = IFF_POINTOPOINT; | |
898 | ||
899 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
900 | err = -EINVAL; | |
901 | break; | |
902 | } | |
903 | ||
904 | t = netdev_priv(dev); | |
905 | } | |
906 | } | |
907 | ||
908 | if (t) { | |
909 | err = 0; | |
9830ad4c | 910 | ip_tunnel_update(itn, t, dev, p, true, 0); |
6dd3c9ec FW |
911 | } else { |
912 | err = -ENOENT; | |
913 | } | |
c5441932 PS |
914 | break; |
915 | ||
916 | case SIOCDELTUNNEL: | |
917 | err = -EPERM; | |
918 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
919 | goto done; | |
920 | ||
921 | if (dev == itn->fb_tunnel_dev) { | |
922 | err = -ENOENT; | |
923 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 924 | if (!t) |
c5441932 PS |
925 | goto done; |
926 | err = -EPERM; | |
927 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
928 | goto done; | |
929 | dev = t->dev; | |
930 | } | |
931 | unregister_netdevice(dev); | |
932 | err = 0; | |
933 | break; | |
934 | ||
935 | default: | |
936 | err = -EINVAL; | |
937 | } | |
938 | ||
939 | done: | |
940 | return err; | |
941 | } | |
942 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
943 | ||
7e059158 | 944 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
945 | { |
946 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
947 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
7e059158 | 948 | int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; |
c5441932 | 949 | |
b96f9afe | 950 | if (new_mtu < ETH_MIN_MTU) |
c5441932 | 951 | return -EINVAL; |
7e059158 DW |
952 | |
953 | if (new_mtu > max_mtu) { | |
954 | if (strict) | |
955 | return -EINVAL; | |
956 | ||
957 | new_mtu = max_mtu; | |
958 | } | |
959 | ||
c5441932 PS |
960 | dev->mtu = new_mtu; |
961 | return 0; | |
962 | } | |
7e059158 DW |
963 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
964 | ||
965 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
966 | { | |
967 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
968 | } | |
c5441932 PS |
969 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
970 | ||
971 | static void ip_tunnel_dev_free(struct net_device *dev) | |
972 | { | |
973 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
974 | ||
975 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 976 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 | 977 | free_percpu(dev->tstats); |
c5441932 PS |
978 | } |
979 | ||
980 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
981 | { | |
c5441932 PS |
982 | struct ip_tunnel *tunnel = netdev_priv(dev); |
983 | struct ip_tunnel_net *itn; | |
984 | ||
6c742e71 | 985 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
986 | |
987 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 988 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
989 | unregister_netdevice_queue(dev, head); |
990 | } | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
993 | ||
1728d4fa ND |
994 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
995 | { | |
996 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
997 | ||
998 | return tunnel->net; | |
999 | } | |
1000 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
1001 | ||
1e99584b ND |
1002 | int ip_tunnel_get_iflink(const struct net_device *dev) |
1003 | { | |
1004 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1005 | ||
1006 | return tunnel->parms.link; | |
1007 | } | |
1008 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
1009 | ||
c7d03a00 | 1010 | int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
c5441932 PS |
1011 | struct rtnl_link_ops *ops, char *devname) |
1012 | { | |
1013 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
1014 | struct ip_tunnel_parm parms; | |
6261d983 | 1015 | unsigned int i; |
c5441932 | 1016 | |
6261d983 | 1017 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
1018 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
1019 | |
1020 | if (!ops) { | |
1021 | itn->fb_tunnel_dev = NULL; | |
1022 | return 0; | |
1023 | } | |
6261d983 | 1024 | |
c5441932 PS |
1025 | memset(&parms, 0, sizeof(parms)); |
1026 | if (devname) | |
1027 | strlcpy(parms.name, devname, IFNAMSIZ); | |
1028 | ||
1029 | rtnl_lock(); | |
1030 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
1031 | /* FB netdevice is special: we have one, and only one per netns. |
1032 | * Allowing to move it to another netns is clearly unsafe. | |
1033 | */ | |
67013282 | 1034 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 1035 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 1036 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 SK |
1037 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
1038 | } | |
b4de77ad | 1039 | rtnl_unlock(); |
c5441932 | 1040 | |
27d79f3b | 1041 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
1042 | } |
1043 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
1044 | ||
6c742e71 ND |
1045 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
1046 | struct rtnl_link_ops *ops) | |
c5441932 | 1047 | { |
6c742e71 ND |
1048 | struct net *net = dev_net(itn->fb_tunnel_dev); |
1049 | struct net_device *dev, *aux; | |
c5441932 PS |
1050 | int h; |
1051 | ||
6c742e71 ND |
1052 | for_each_netdev_safe(net, dev, aux) |
1053 | if (dev->rtnl_link_ops == ops) | |
1054 | unregister_netdevice_queue(dev, head); | |
1055 | ||
c5441932 PS |
1056 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1057 | struct ip_tunnel *t; | |
1058 | struct hlist_node *n; | |
1059 | struct hlist_head *thead = &itn->tunnels[h]; | |
1060 | ||
1061 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
1062 | /* If dev is in the same netns, it has already |
1063 | * been added to the list by the previous loop. | |
1064 | */ | |
1065 | if (!net_eq(dev_net(t->dev), net)) | |
1066 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 1067 | } |
c5441932 PS |
1068 | } |
1069 | ||
64bc1781 ED |
1070 | void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id, |
1071 | struct rtnl_link_ops *ops) | |
c5441932 | 1072 | { |
64bc1781 ED |
1073 | struct ip_tunnel_net *itn; |
1074 | struct net *net; | |
c5441932 PS |
1075 | LIST_HEAD(list); |
1076 | ||
1077 | rtnl_lock(); | |
64bc1781 ED |
1078 | list_for_each_entry(net, net_list, exit_list) { |
1079 | itn = net_generic(net, id); | |
1080 | ip_tunnel_destroy(itn, &list, ops); | |
1081 | } | |
c5441932 PS |
1082 | unregister_netdevice_many(&list); |
1083 | rtnl_unlock(); | |
c5441932 | 1084 | } |
64bc1781 | 1085 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets); |
c5441932 PS |
1086 | |
1087 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1088 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 PS |
1089 | { |
1090 | struct ip_tunnel *nt; | |
1091 | struct net *net = dev_net(dev); | |
1092 | struct ip_tunnel_net *itn; | |
1093 | int mtu; | |
1094 | int err; | |
1095 | ||
1096 | nt = netdev_priv(dev); | |
1097 | itn = net_generic(net, nt->ip_tnl_net_id); | |
1098 | ||
2e15ea39 PS |
1099 | if (nt->collect_md) { |
1100 | if (rtnl_dereference(itn->collect_md_tun)) | |
1101 | return -EEXIST; | |
1102 | } else { | |
1103 | if (ip_tunnel_find(itn, p, dev->type)) | |
1104 | return -EEXIST; | |
1105 | } | |
c5441932 | 1106 | |
5e6700b3 | 1107 | nt->net = net; |
c5441932 | 1108 | nt->parms = *p; |
9830ad4c | 1109 | nt->fwmark = fwmark; |
c5441932 PS |
1110 | err = register_netdevice(dev); |
1111 | if (err) | |
1112 | goto out; | |
1113 | ||
1114 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1115 | eth_hw_addr_random(dev); | |
1116 | ||
1117 | mtu = ip_tunnel_bind_dev(dev); | |
4aa9ebdc SB |
1118 | if (tb[IFLA_MTU]) { |
1119 | unsigned int max = 0xfff8 - dev->hard_header_len - nt->hlen; | |
1120 | ||
1121 | dev->mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, | |
1122 | (unsigned int)(max - sizeof(struct iphdr))); | |
1123 | } else { | |
c5441932 | 1124 | dev->mtu = mtu; |
4aa9ebdc | 1125 | } |
c5441932 PS |
1126 | |
1127 | ip_tunnel_add(itn, nt); | |
c5441932 PS |
1128 | out: |
1129 | return err; | |
1130 | } | |
1131 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1132 | ||
1133 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1134 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 | 1135 | { |
6c742e71 | 1136 | struct ip_tunnel *t; |
c5441932 | 1137 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1138 | struct net *net = tunnel->net; |
c5441932 PS |
1139 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1140 | ||
1141 | if (dev == itn->fb_tunnel_dev) | |
d57420a1 | 1142 | return fan_has_map(&tunnel->fan) ? 0 : -EINVAL; |
c5441932 | 1143 | |
c5441932 PS |
1144 | t = ip_tunnel_find(itn, p, dev->type); |
1145 | ||
1146 | if (t) { | |
1147 | if (t->dev != dev) | |
1148 | return -EEXIST; | |
1149 | } else { | |
6c742e71 | 1150 | t = tunnel; |
c5441932 PS |
1151 | |
1152 | if (dev->type != ARPHRD_ETHER) { | |
1153 | unsigned int nflags = 0; | |
1154 | ||
1155 | if (ipv4_is_multicast(p->iph.daddr)) | |
1156 | nflags = IFF_BROADCAST; | |
1157 | else if (p->iph.daddr) | |
1158 | nflags = IFF_POINTOPOINT; | |
1159 | ||
1160 | if ((dev->flags ^ nflags) & | |
1161 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1162 | return -EINVAL; | |
1163 | } | |
1164 | } | |
1165 | ||
9830ad4c | 1166 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); |
c5441932 PS |
1167 | return 0; |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1170 | ||
1171 | int ip_tunnel_init(struct net_device *dev) | |
1172 | { | |
1173 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1174 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1175 | int err; |
c5441932 | 1176 | |
cf124db5 DM |
1177 | dev->needs_free_netdev = true; |
1178 | dev->priv_destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1179 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1180 | if (!dev->tstats) |
1181 | return -ENOMEM; | |
1182 | ||
e09acddf PA |
1183 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1184 | if (err) { | |
9a4aa9af | 1185 | free_percpu(dev->tstats); |
e09acddf | 1186 | return err; |
9a4aa9af TH |
1187 | } |
1188 | ||
c5441932 PS |
1189 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1190 | if (err) { | |
e09acddf | 1191 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1192 | free_percpu(dev->tstats); |
1193 | return err; | |
1194 | } | |
1195 | ||
1196 | tunnel->dev = dev; | |
6c742e71 | 1197 | tunnel->net = dev_net(dev); |
c5441932 PS |
1198 | strcpy(tunnel->parms.name, dev->name); |
1199 | iph->version = 4; | |
1200 | iph->ihl = 5; | |
1201 | ||
96597be2 | 1202 | if (tunnel->collect_md) |
2e15ea39 | 1203 | netif_keep_dst(dev); |
c5441932 PS |
1204 | return 0; |
1205 | } | |
1206 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1207 | ||
1208 | void ip_tunnel_uninit(struct net_device *dev) | |
1209 | { | |
c5441932 | 1210 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1211 | struct net *net = tunnel->net; |
c5441932 PS |
1212 | struct ip_tunnel_net *itn; |
1213 | ||
1214 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1215 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1216 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1217 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1218 | |
e09acddf | 1219 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1220 | } |
1221 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1222 | ||
1223 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
c7d03a00 | 1224 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c5441932 PS |
1225 | { |
1226 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1227 | tunnel->ip_tnl_net_id = net_id; | |
1228 | } | |
1229 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1230 | ||
1231 | MODULE_LICENSE("GPL"); |