Commit | Line | Data |
---|---|---|
c12b395a | 1 | /* |
2 | * GRE over IPv6 protocol decoder. | |
3 | * | |
4 | * Authors: Dmitry Kozlov (xeb@mail.ru) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
15 | #include <linux/capability.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/tcp.h> | |
25 | #include <linux/udp.h> | |
26 | #include <linux/if_arp.h> | |
c12b395a | 27 | #include <linux/init.h> |
28 | #include <linux/in6.h> | |
29 | #include <linux/inetdevice.h> | |
30 | #include <linux/igmp.h> | |
31 | #include <linux/netfilter_ipv4.h> | |
32 | #include <linux/etherdevice.h> | |
33 | #include <linux/if_ether.h> | |
34 | #include <linux/hash.h> | |
35 | #include <linux/if_tunnel.h> | |
36 | #include <linux/ip6_tunnel.h> | |
37 | ||
38 | #include <net/sock.h> | |
39 | #include <net/ip.h> | |
c5441932 | 40 | #include <net/ip_tunnels.h> |
c12b395a | 41 | #include <net/icmp.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/addrconf.h> | |
44 | #include <net/arp.h> | |
45 | #include <net/checksum.h> | |
46 | #include <net/dsfield.h> | |
47 | #include <net/inet_ecn.h> | |
48 | #include <net/xfrm.h> | |
49 | #include <net/net_namespace.h> | |
50 | #include <net/netns/generic.h> | |
51 | #include <net/rtnetlink.h> | |
52 | ||
53 | #include <net/ipv6.h> | |
54 | #include <net/ip6_fib.h> | |
55 | #include <net/ip6_route.h> | |
56 | #include <net/ip6_tunnel.h> | |
57 | ||
58 | ||
eccc1bb8 | 59 | static bool log_ecn_error = true; |
60 | module_param(log_ecn_error, bool, 0644); | |
61 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
62 | ||
c12b395a | 63 | #define HASH_SIZE_SHIFT 5 |
64 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
65 | ||
66 | static int ip6gre_net_id __read_mostly; | |
67 | struct ip6gre_net { | |
68 | struct ip6_tnl __rcu *tunnels[4][HASH_SIZE]; | |
69 | ||
70 | struct net_device *fb_tunnel_dev; | |
71 | }; | |
72 | ||
73 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly; | |
22f08069 | 74 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; |
c12b395a | 75 | static int ip6gre_tunnel_init(struct net_device *dev); |
76 | static void ip6gre_tunnel_setup(struct net_device *dev); | |
77 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); | |
78 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); | |
79 | ||
80 | /* Tunnel hash table */ | |
81 | ||
82 | /* | |
83 | 4 hash tables: | |
84 | ||
85 | 3: (remote,local) | |
86 | 2: (remote,*) | |
87 | 1: (*,local) | |
88 | 0: (*,*) | |
89 | ||
90 | We require exact key match i.e. if a key is present in packet | |
91 | it will match only tunnel with the same key; if it is not present, | |
92 | it will match only keyless tunnel. | |
93 | ||
94 | All keysless packets, if not matched configured keyless tunnels | |
95 | will match fallback tunnel. | |
96 | */ | |
97 | ||
98 | #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1)) | |
99 | static u32 HASH_ADDR(const struct in6_addr *addr) | |
100 | { | |
101 | u32 hash = ipv6_addr_hash(addr); | |
102 | ||
103 | return hash_32(hash, HASH_SIZE_SHIFT); | |
104 | } | |
105 | ||
106 | #define tunnels_r_l tunnels[3] | |
107 | #define tunnels_r tunnels[2] | |
108 | #define tunnels_l tunnels[1] | |
109 | #define tunnels_wc tunnels[0] | |
c12b395a | 110 | |
c12b395a | 111 | /* Given src, dst and key, find appropriate for input tunnel. */ |
112 | ||
113 | static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, | |
114 | const struct in6_addr *remote, const struct in6_addr *local, | |
115 | __be32 key, __be16 gre_proto) | |
116 | { | |
117 | struct net *net = dev_net(dev); | |
118 | int link = dev->ifindex; | |
119 | unsigned int h0 = HASH_ADDR(remote); | |
120 | unsigned int h1 = HASH_KEY(key); | |
121 | struct ip6_tnl *t, *cand = NULL; | |
122 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
123 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? | |
124 | ARPHRD_ETHER : ARPHRD_IP6GRE; | |
125 | int score, cand_score = 4; | |
126 | ||
e086cadc | 127 | for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
c12b395a | 128 | if (!ipv6_addr_equal(local, &t->parms.laddr) || |
129 | !ipv6_addr_equal(remote, &t->parms.raddr) || | |
130 | key != t->parms.i_key || | |
131 | !(t->dev->flags & IFF_UP)) | |
132 | continue; | |
133 | ||
134 | if (t->dev->type != ARPHRD_IP6GRE && | |
135 | t->dev->type != dev_type) | |
136 | continue; | |
137 | ||
138 | score = 0; | |
139 | if (t->parms.link != link) | |
140 | score |= 1; | |
141 | if (t->dev->type != dev_type) | |
142 | score |= 2; | |
143 | if (score == 0) | |
144 | return t; | |
145 | ||
146 | if (score < cand_score) { | |
147 | cand = t; | |
148 | cand_score = score; | |
149 | } | |
150 | } | |
151 | ||
e086cadc | 152 | for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
c12b395a | 153 | if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
154 | key != t->parms.i_key || | |
155 | !(t->dev->flags & IFF_UP)) | |
156 | continue; | |
157 | ||
158 | if (t->dev->type != ARPHRD_IP6GRE && | |
159 | t->dev->type != dev_type) | |
160 | continue; | |
161 | ||
162 | score = 0; | |
163 | if (t->parms.link != link) | |
164 | score |= 1; | |
165 | if (t->dev->type != dev_type) | |
166 | score |= 2; | |
167 | if (score == 0) | |
168 | return t; | |
169 | ||
170 | if (score < cand_score) { | |
171 | cand = t; | |
172 | cand_score = score; | |
173 | } | |
174 | } | |
175 | ||
e086cadc | 176 | for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
c12b395a | 177 | if ((!ipv6_addr_equal(local, &t->parms.laddr) && |
178 | (!ipv6_addr_equal(local, &t->parms.raddr) || | |
179 | !ipv6_addr_is_multicast(local))) || | |
180 | key != t->parms.i_key || | |
181 | !(t->dev->flags & IFF_UP)) | |
182 | continue; | |
183 | ||
184 | if (t->dev->type != ARPHRD_IP6GRE && | |
185 | t->dev->type != dev_type) | |
186 | continue; | |
187 | ||
188 | score = 0; | |
189 | if (t->parms.link != link) | |
190 | score |= 1; | |
191 | if (t->dev->type != dev_type) | |
192 | score |= 2; | |
193 | if (score == 0) | |
194 | return t; | |
195 | ||
196 | if (score < cand_score) { | |
197 | cand = t; | |
198 | cand_score = score; | |
199 | } | |
200 | } | |
201 | ||
e086cadc | 202 | for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
c12b395a | 203 | if (t->parms.i_key != key || |
204 | !(t->dev->flags & IFF_UP)) | |
205 | continue; | |
206 | ||
207 | if (t->dev->type != ARPHRD_IP6GRE && | |
208 | t->dev->type != dev_type) | |
209 | continue; | |
210 | ||
211 | score = 0; | |
212 | if (t->parms.link != link) | |
213 | score |= 1; | |
214 | if (t->dev->type != dev_type) | |
215 | score |= 2; | |
216 | if (score == 0) | |
217 | return t; | |
218 | ||
219 | if (score < cand_score) { | |
220 | cand = t; | |
221 | cand_score = score; | |
222 | } | |
223 | } | |
224 | ||
53b24b8f | 225 | if (cand) |
c12b395a | 226 | return cand; |
227 | ||
228 | dev = ign->fb_tunnel_dev; | |
229 | if (dev->flags & IFF_UP) | |
230 | return netdev_priv(dev); | |
231 | ||
232 | return NULL; | |
233 | } | |
234 | ||
235 | static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, | |
236 | const struct __ip6_tnl_parm *p) | |
237 | { | |
238 | const struct in6_addr *remote = &p->raddr; | |
239 | const struct in6_addr *local = &p->laddr; | |
240 | unsigned int h = HASH_KEY(p->i_key); | |
241 | int prio = 0; | |
242 | ||
243 | if (!ipv6_addr_any(local)) | |
244 | prio |= 1; | |
245 | if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { | |
246 | prio |= 2; | |
247 | h ^= HASH_ADDR(remote); | |
248 | } | |
249 | ||
250 | return &ign->tunnels[prio][h]; | |
251 | } | |
252 | ||
253 | static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, | |
254 | const struct ip6_tnl *t) | |
255 | { | |
256 | return __ip6gre_bucket(ign, &t->parms); | |
257 | } | |
258 | ||
259 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) | |
260 | { | |
261 | struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); | |
262 | ||
263 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
264 | rcu_assign_pointer(*tp, t); | |
265 | } | |
266 | ||
267 | static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) | |
268 | { | |
269 | struct ip6_tnl __rcu **tp; | |
270 | struct ip6_tnl *iter; | |
271 | ||
272 | for (tp = ip6gre_bucket(ign, t); | |
273 | (iter = rtnl_dereference(*tp)) != NULL; | |
274 | tp = &iter->next) { | |
275 | if (t == iter) { | |
276 | rcu_assign_pointer(*tp, t->next); | |
277 | break; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, | |
283 | const struct __ip6_tnl_parm *parms, | |
284 | int type) | |
285 | { | |
286 | const struct in6_addr *remote = &parms->raddr; | |
287 | const struct in6_addr *local = &parms->laddr; | |
288 | __be32 key = parms->i_key; | |
289 | int link = parms->link; | |
290 | struct ip6_tnl *t; | |
291 | struct ip6_tnl __rcu **tp; | |
292 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
293 | ||
294 | for (tp = __ip6gre_bucket(ign, parms); | |
295 | (t = rtnl_dereference(*tp)) != NULL; | |
296 | tp = &t->next) | |
297 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
298 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
299 | key == t->parms.i_key && | |
300 | link == t->parms.link && | |
301 | type == t->dev->type) | |
302 | break; | |
303 | ||
304 | return t; | |
305 | } | |
306 | ||
307 | static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, | |
308 | const struct __ip6_tnl_parm *parms, int create) | |
309 | { | |
310 | struct ip6_tnl *t, *nt; | |
311 | struct net_device *dev; | |
312 | char name[IFNAMSIZ]; | |
313 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
314 | ||
315 | t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); | |
cd0a0bd9 SK |
316 | if (t && create) |
317 | return NULL; | |
c12b395a | 318 | if (t || !create) |
319 | return t; | |
320 | ||
321 | if (parms->name[0]) | |
322 | strlcpy(name, parms->name, IFNAMSIZ); | |
323 | else | |
324 | strcpy(name, "ip6gre%d"); | |
325 | ||
c835a677 TG |
326 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
327 | ip6gre_tunnel_setup); | |
c12b395a | 328 | if (!dev) |
329 | return NULL; | |
330 | ||
331 | dev_net_set(dev, net); | |
332 | ||
333 | nt = netdev_priv(dev); | |
334 | nt->parms = *parms; | |
335 | dev->rtnl_link_ops = &ip6gre_link_ops; | |
336 | ||
337 | nt->dev = dev; | |
0bd87628 | 338 | nt->net = dev_net(dev); |
c12b395a | 339 | ip6gre_tnl_link_config(nt, 1); |
340 | ||
341 | if (register_netdevice(dev) < 0) | |
342 | goto failed_free; | |
343 | ||
344 | /* Can use a lockless transmit, unless we generate output sequences */ | |
345 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
346 | dev->features |= NETIF_F_LLTX; | |
347 | ||
348 | dev_hold(dev); | |
349 | ip6gre_tunnel_link(ign, nt); | |
350 | return nt; | |
351 | ||
352 | failed_free: | |
353 | free_netdev(dev); | |
354 | return NULL; | |
355 | } | |
356 | ||
357 | static void ip6gre_tunnel_uninit(struct net_device *dev) | |
358 | { | |
22f08069 ND |
359 | struct ip6_tnl *t = netdev_priv(dev); |
360 | struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); | |
c12b395a | 361 | |
22f08069 | 362 | ip6gre_tunnel_unlink(ign, t); |
d4257295 | 363 | ip6_tnl_dst_reset(t); |
c12b395a | 364 | dev_put(dev); |
365 | } | |
366 | ||
367 | ||
368 | static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
369 | u8 type, u8 code, int offset, __be32 info) | |
370 | { | |
371 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; | |
b87fb39e ED |
372 | __be16 *p = (__be16 *)(skb->data + offset); |
373 | int grehlen = offset + 4; | |
c12b395a | 374 | struct ip6_tnl *t; |
375 | __be16 flags; | |
376 | ||
377 | flags = p[0]; | |
378 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
379 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
380 | return; | |
381 | if (flags&GRE_KEY) { | |
382 | grehlen += 4; | |
383 | if (flags&GRE_CSUM) | |
384 | grehlen += 4; | |
385 | } | |
386 | } | |
387 | ||
388 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
b87fb39e | 389 | if (!pskb_may_pull(skb, grehlen)) |
c12b395a | 390 | return; |
b87fb39e ED |
391 | ipv6h = (const struct ipv6hdr *)skb->data; |
392 | p = (__be16 *)(skb->data + offset); | |
c12b395a | 393 | |
c12b395a | 394 | t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, |
395 | flags & GRE_KEY ? | |
396 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
397 | p[1]); | |
63159f29 | 398 | if (!t) |
0c5794a6 | 399 | return; |
c12b395a | 400 | |
401 | switch (type) { | |
402 | __u32 teli; | |
403 | struct ipv6_tlv_tnl_enc_lim *tel; | |
404 | __u32 mtu; | |
405 | case ICMPV6_DEST_UNREACH: | |
a46496ce MB |
406 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
407 | t->parms.name); | |
c12b395a | 408 | break; |
409 | case ICMPV6_TIME_EXCEED: | |
410 | if (code == ICMPV6_EXC_HOPLIMIT) { | |
a46496ce MB |
411 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
412 | t->parms.name); | |
c12b395a | 413 | } |
414 | break; | |
415 | case ICMPV6_PARAMPROB: | |
416 | teli = 0; | |
417 | if (code == ICMPV6_HDR_FIELD) | |
418 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); | |
419 | ||
d1e158e2 | 420 | if (teli && teli == be32_to_cpu(info) - 2) { |
c12b395a | 421 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
422 | if (tel->encap_limit == 0) { | |
a46496ce MB |
423 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
424 | t->parms.name); | |
c12b395a | 425 | } |
426 | } else { | |
a46496ce MB |
427 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
428 | t->parms.name); | |
c12b395a | 429 | } |
430 | break; | |
431 | case ICMPV6_PKT_TOOBIG: | |
d1e158e2 | 432 | mtu = be32_to_cpu(info) - offset; |
c12b395a | 433 | if (mtu < IPV6_MIN_MTU) |
434 | mtu = IPV6_MIN_MTU; | |
435 | t->dev->mtu = mtu; | |
436 | break; | |
437 | } | |
438 | ||
439 | if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) | |
440 | t->err_count++; | |
441 | else | |
442 | t->err_count = 1; | |
443 | t->err_time = jiffies; | |
c12b395a | 444 | } |
445 | ||
c12b395a | 446 | static int ip6gre_rcv(struct sk_buff *skb) |
447 | { | |
448 | const struct ipv6hdr *ipv6h; | |
449 | u8 *h; | |
450 | __be16 flags; | |
451 | __sum16 csum = 0; | |
452 | __be32 key = 0; | |
453 | u32 seqno = 0; | |
454 | struct ip6_tnl *tunnel; | |
455 | int offset = 4; | |
456 | __be16 gre_proto; | |
eccc1bb8 | 457 | int err; |
c12b395a | 458 | |
459 | if (!pskb_may_pull(skb, sizeof(struct in6_addr))) | |
0c5794a6 | 460 | goto drop; |
c12b395a | 461 | |
462 | ipv6h = ipv6_hdr(skb); | |
463 | h = skb->data; | |
464 | flags = *(__be16 *)h; | |
465 | ||
466 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
467 | /* - Version must be 0. | |
468 | - We do not support routing headers. | |
469 | */ | |
470 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
0c5794a6 | 471 | goto drop; |
c12b395a | 472 | |
473 | if (flags&GRE_CSUM) { | |
81249bea | 474 | csum = skb_checksum_simple_validate(skb); |
c12b395a | 475 | offset += 4; |
476 | } | |
477 | if (flags&GRE_KEY) { | |
478 | key = *(__be32 *)(h + offset); | |
479 | offset += 4; | |
480 | } | |
481 | if (flags&GRE_SEQ) { | |
482 | seqno = ntohl(*(__be32 *)(h + offset)); | |
483 | offset += 4; | |
484 | } | |
485 | } | |
486 | ||
487 | gre_proto = *(__be16 *)(h + 2); | |
488 | ||
c12b395a | 489 | tunnel = ip6gre_tunnel_lookup(skb->dev, |
490 | &ipv6h->saddr, &ipv6h->daddr, key, | |
491 | gre_proto); | |
492 | if (tunnel) { | |
8f84985f | 493 | struct pcpu_sw_netstats *tstats; |
c12b395a | 494 | |
495 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
496 | goto drop; | |
497 | ||
498 | if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) { | |
499 | tunnel->dev->stats.rx_dropped++; | |
500 | goto drop; | |
501 | } | |
502 | ||
c12b395a | 503 | skb->protocol = gre_proto; |
504 | /* WCCP version 1 and 2 protocol decoding. | |
be6572fd | 505 | * - Change protocol to IPv6 |
c12b395a | 506 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header |
507 | */ | |
508 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { | |
be6572fd | 509 | skb->protocol = htons(ETH_P_IPV6); |
c12b395a | 510 | if ((*(h + offset) & 0xF0) != 0x40) |
511 | offset += 4; | |
512 | } | |
513 | ||
514 | skb->mac_header = skb->network_header; | |
515 | __pskb_pull(skb, offset); | |
516 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); | |
c12b395a | 517 | |
518 | if (((flags&GRE_CSUM) && csum) || | |
519 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
520 | tunnel->dev->stats.rx_crc_errors++; | |
521 | tunnel->dev->stats.rx_errors++; | |
522 | goto drop; | |
523 | } | |
524 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
525 | if (!(flags&GRE_SEQ) || | |
526 | (tunnel->i_seqno && | |
527 | (s32)(seqno - tunnel->i_seqno) < 0)) { | |
528 | tunnel->dev->stats.rx_fifo_errors++; | |
529 | tunnel->dev->stats.rx_errors++; | |
530 | goto drop; | |
531 | } | |
532 | tunnel->i_seqno = seqno + 1; | |
533 | } | |
534 | ||
535 | /* Warning: All skb pointers will be invalidated! */ | |
536 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
537 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
538 | tunnel->dev->stats.rx_length_errors++; | |
539 | tunnel->dev->stats.rx_errors++; | |
540 | goto drop; | |
541 | } | |
542 | ||
543 | ipv6h = ipv6_hdr(skb); | |
544 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
545 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
546 | } | |
547 | ||
ea23192e | 548 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); |
eccc1bb8 | 549 | |
550 | skb_reset_network_header(skb); | |
551 | ||
552 | err = IP6_ECN_decapsulate(ipv6h, skb); | |
553 | if (unlikely(err)) { | |
554 | if (log_ecn_error) | |
555 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
556 | &ipv6h->saddr, | |
557 | ipv6_get_dsfield(ipv6h)); | |
558 | if (err > 1) { | |
559 | ++tunnel->dev->stats.rx_frame_errors; | |
560 | ++tunnel->dev->stats.rx_errors; | |
561 | goto drop; | |
562 | } | |
563 | } | |
564 | ||
c12b395a | 565 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
566 | u64_stats_update_begin(&tstats->syncp); | |
567 | tstats->rx_packets++; | |
568 | tstats->rx_bytes += skb->len; | |
569 | u64_stats_update_end(&tstats->syncp); | |
570 | ||
c12b395a | 571 | netif_rx(skb); |
572 | ||
c12b395a | 573 | return 0; |
574 | } | |
575 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
576 | ||
577 | drop: | |
c12b395a | 578 | kfree_skb(skb); |
579 | return 0; | |
580 | } | |
581 | ||
582 | struct ipv6_tel_txoption { | |
583 | struct ipv6_txoptions ops; | |
584 | __u8 dst_opt[8]; | |
585 | }; | |
586 | ||
587 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) | |
588 | { | |
589 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
590 | ||
591 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; | |
592 | opt->dst_opt[3] = 1; | |
593 | opt->dst_opt[4] = encap_limit; | |
594 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
595 | opt->dst_opt[6] = 1; | |
596 | ||
597 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; | |
598 | opt->ops.opt_nflen = 8; | |
599 | } | |
600 | ||
601 | static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, | |
602 | struct net_device *dev, | |
603 | __u8 dsfield, | |
604 | struct flowi6 *fl6, | |
605 | int encap_limit, | |
606 | __u32 *pmtu) | |
607 | { | |
c12b395a | 608 | struct ip6_tnl *tunnel = netdev_priv(dev); |
22f08069 | 609 | struct net *net = tunnel->net; |
c12b395a | 610 | struct net_device *tdev; /* Device to other host */ |
611 | struct ipv6hdr *ipv6h; /* Our new IP header */ | |
3da812d8 | 612 | unsigned int max_headroom = 0; /* The extra header space needed */ |
c12b395a | 613 | int gre_hlen; |
614 | struct ipv6_tel_txoption opt; | |
615 | int mtu; | |
616 | struct dst_entry *dst = NULL, *ndst = NULL; | |
617 | struct net_device_stats *stats = &tunnel->dev->stats; | |
618 | int err = -1; | |
619 | u8 proto; | |
c12b395a | 620 | struct sk_buff *new_skb; |
54bc9bac | 621 | __be16 protocol; |
c12b395a | 622 | |
623 | if (dev->type == ARPHRD_ETHER) | |
624 | IPCB(skb)->flags = 0; | |
625 | ||
626 | if (dev->header_ops && dev->type == ARPHRD_IP6GRE) { | |
627 | gre_hlen = 0; | |
628 | ipv6h = (struct ipv6hdr *)skb->data; | |
629 | fl6->daddr = ipv6h->daddr; | |
630 | } else { | |
631 | gre_hlen = tunnel->hlen; | |
632 | fl6->daddr = tunnel->parms.raddr; | |
633 | } | |
634 | ||
635 | if (!fl6->flowi6_mark) | |
f230d1e8 | 636 | dst = ip6_tnl_dst_get(tunnel); |
c12b395a | 637 | |
638 | if (!dst) { | |
cdf3464e | 639 | dst = ip6_route_output(net, NULL, fl6); |
c12b395a | 640 | |
cdf3464e | 641 | if (dst->error) |
c12b395a | 642 | goto tx_err_link_failure; |
cdf3464e MKL |
643 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
644 | if (IS_ERR(dst)) { | |
645 | err = PTR_ERR(dst); | |
646 | dst = NULL; | |
c12b395a | 647 | goto tx_err_link_failure; |
648 | } | |
cdf3464e | 649 | ndst = dst; |
c12b395a | 650 | } |
651 | ||
652 | tdev = dst->dev; | |
653 | ||
654 | if (tdev == dev) { | |
655 | stats->collisions++; | |
656 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
657 | tunnel->parms.name); | |
658 | goto tx_err_dst_release; | |
659 | } | |
660 | ||
661 | mtu = dst_mtu(dst) - sizeof(*ipv6h); | |
662 | if (encap_limit >= 0) { | |
663 | max_headroom += 8; | |
664 | mtu -= 8; | |
665 | } | |
666 | if (mtu < IPV6_MIN_MTU) | |
667 | mtu = IPV6_MIN_MTU; | |
668 | if (skb_dst(skb)) | |
669 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
670 | if (skb->len > mtu) { | |
671 | *pmtu = mtu; | |
672 | err = -EMSGSIZE; | |
673 | goto tx_err_dst_release; | |
674 | } | |
675 | ||
676 | if (tunnel->err_count > 0) { | |
677 | if (time_before(jiffies, | |
678 | tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
679 | tunnel->err_count--; | |
680 | ||
681 | dst_link_failure(skb); | |
682 | } else | |
683 | tunnel->err_count = 0; | |
684 | } | |
685 | ||
963a88b3 ND |
686 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); |
687 | ||
3da812d8 | 688 | max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; |
c12b395a | 689 | |
690 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
691 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
692 | new_skb = skb_realloc_headroom(skb, max_headroom); | |
693 | if (max_headroom > dev->needed_headroom) | |
694 | dev->needed_headroom = max_headroom; | |
695 | if (!new_skb) | |
696 | goto tx_err_dst_release; | |
697 | ||
698 | if (skb->sk) | |
699 | skb_set_owner_w(new_skb, skb->sk); | |
700 | consume_skb(skb); | |
701 | skb = new_skb; | |
702 | } | |
703 | ||
cdf3464e MKL |
704 | if (!fl6->flowi6_mark && ndst) |
705 | ip6_tnl_dst_set(tunnel, ndst); | |
706 | skb_dst_set(skb, dst); | |
c12b395a | 707 | |
c12b395a | 708 | proto = NEXTHDR_GRE; |
709 | if (encap_limit >= 0) { | |
710 | init_tel_txopt(&opt, encap_limit); | |
711 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
712 | } | |
713 | ||
3d483058 HFS |
714 | if (likely(!skb->encapsulation)) { |
715 | skb_reset_inner_headers(skb); | |
716 | skb->encapsulation = 1; | |
717 | } | |
718 | ||
c12b395a | 719 | skb_push(skb, gre_hlen); |
720 | skb_reset_network_header(skb); | |
ae782bb1 | 721 | skb_set_transport_header(skb, sizeof(*ipv6h)); |
c12b395a | 722 | |
723 | /* | |
724 | * Push down and install the IP header. | |
725 | */ | |
726 | ipv6h = ipv6_hdr(skb); | |
cb1ce2ef | 727 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
42240901 | 728 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
c12b395a | 729 | ipv6h->hop_limit = tunnel->parms.hop_limit; |
730 | ipv6h->nexthdr = proto; | |
731 | ipv6h->saddr = fl6->saddr; | |
732 | ipv6h->daddr = fl6->daddr; | |
733 | ||
734 | ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags; | |
54bc9bac TH |
735 | protocol = (dev->type == ARPHRD_ETHER) ? |
736 | htons(ETH_P_TEB) : skb->protocol; | |
737 | ((__be16 *)(ipv6h + 1))[1] = protocol; | |
c12b395a | 738 | |
739 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
740 | __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4); | |
741 | ||
742 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
743 | ++tunnel->o_seqno; | |
744 | *ptr = htonl(tunnel->o_seqno); | |
745 | ptr--; | |
746 | } | |
747 | if (tunnel->parms.o_flags&GRE_KEY) { | |
748 | *ptr = tunnel->parms.o_key; | |
749 | ptr--; | |
750 | } | |
751 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
752 | *ptr = 0; | |
753 | *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1), | |
754 | skb->len - sizeof(struct ipv6hdr)); | |
755 | } | |
756 | } | |
757 | ||
54bc9bac TH |
758 | skb_set_inner_protocol(skb, protocol); |
759 | ||
79b16aad | 760 | ip6tunnel_xmit(NULL, skb, dev); |
c12b395a | 761 | return 0; |
762 | tx_err_link_failure: | |
763 | stats->tx_carrier_errors++; | |
764 | dst_link_failure(skb); | |
765 | tx_err_dst_release: | |
cdf3464e | 766 | dst_release(dst); |
c12b395a | 767 | return err; |
768 | } | |
769 | ||
770 | static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) | |
771 | { | |
772 | struct ip6_tnl *t = netdev_priv(dev); | |
773 | const struct iphdr *iph = ip_hdr(skb); | |
774 | int encap_limit = -1; | |
775 | struct flowi6 fl6; | |
776 | __u8 dsfield; | |
777 | __u32 mtu; | |
778 | int err; | |
779 | ||
780 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
781 | encap_limit = t->parms.encap_limit; | |
782 | ||
783 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
3be07244 | 784 | fl6.flowi6_proto = IPPROTO_GRE; |
c12b395a | 785 | |
786 | dsfield = ipv4_get_dsfield(iph); | |
787 | ||
788 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
789 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) | |
790 | & IPV6_TCLASS_MASK; | |
791 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
792 | fl6.flowi6_mark = skb->mark; | |
793 | ||
794 | err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); | |
795 | if (err != 0) { | |
796 | /* XXX: send ICMP error even if DF is not set. */ | |
797 | if (err == -EMSGSIZE) | |
798 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
799 | htonl(mtu)); | |
800 | return -1; | |
801 | } | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) | |
807 | { | |
808 | struct ip6_tnl *t = netdev_priv(dev); | |
809 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
810 | int encap_limit = -1; | |
811 | __u16 offset; | |
812 | struct flowi6 fl6; | |
813 | __u8 dsfield; | |
814 | __u32 mtu; | |
815 | int err; | |
816 | ||
817 | if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) | |
818 | return -1; | |
819 | ||
820 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); | |
821 | if (offset > 0) { | |
822 | struct ipv6_tlv_tnl_enc_lim *tel; | |
823 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; | |
824 | if (tel->encap_limit == 0) { | |
825 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
826 | ICMPV6_HDR_FIELD, offset + 2); | |
827 | return -1; | |
828 | } | |
829 | encap_limit = tel->encap_limit - 1; | |
830 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
831 | encap_limit = t->parms.encap_limit; | |
832 | ||
833 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
3be07244 | 834 | fl6.flowi6_proto = IPPROTO_GRE; |
c12b395a | 835 | |
836 | dsfield = ipv6_get_dsfield(ipv6h); | |
837 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
838 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
839 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) | |
3308de2b | 840 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
c12b395a | 841 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
842 | fl6.flowi6_mark = skb->mark; | |
843 | ||
844 | err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); | |
845 | if (err != 0) { | |
846 | if (err == -EMSGSIZE) | |
847 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
848 | return -1; | |
849 | } | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | /** | |
855 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
856 | * @t: the outgoing tunnel device | |
857 | * @hdr: IPv6 header from the incoming packet | |
858 | * | |
859 | * Description: | |
860 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
861 | * doesn't match source of incoming packet. | |
862 | * | |
863 | * Return: | |
864 | * 1 if conflict, | |
865 | * 0 else | |
866 | **/ | |
867 | ||
868 | static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, | |
869 | const struct ipv6hdr *hdr) | |
870 | { | |
871 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
872 | } | |
873 | ||
874 | static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) | |
875 | { | |
876 | struct ip6_tnl *t = netdev_priv(dev); | |
877 | int encap_limit = -1; | |
878 | struct flowi6 fl6; | |
879 | __u32 mtu; | |
880 | int err; | |
881 | ||
882 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
883 | encap_limit = t->parms.encap_limit; | |
884 | ||
885 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
886 | fl6.flowi6_proto = skb->protocol; | |
887 | ||
888 | err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu); | |
889 | ||
890 | return err; | |
891 | } | |
892 | ||
893 | static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, | |
894 | struct net_device *dev) | |
895 | { | |
896 | struct ip6_tnl *t = netdev_priv(dev); | |
897 | struct net_device_stats *stats = &t->dev->stats; | |
898 | int ret; | |
899 | ||
d5005140 | 900 | if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) |
41ab3e31 | 901 | goto tx_err; |
c12b395a | 902 | |
903 | switch (skb->protocol) { | |
904 | case htons(ETH_P_IP): | |
905 | ret = ip6gre_xmit_ipv4(skb, dev); | |
906 | break; | |
907 | case htons(ETH_P_IPV6): | |
908 | ret = ip6gre_xmit_ipv6(skb, dev); | |
909 | break; | |
910 | default: | |
911 | ret = ip6gre_xmit_other(skb, dev); | |
912 | break; | |
913 | } | |
914 | ||
915 | if (ret < 0) | |
916 | goto tx_err; | |
917 | ||
918 | return NETDEV_TX_OK; | |
919 | ||
920 | tx_err: | |
921 | stats->tx_errors++; | |
922 | stats->tx_dropped++; | |
923 | kfree_skb(skb); | |
924 | return NETDEV_TX_OK; | |
925 | } | |
926 | ||
927 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) | |
928 | { | |
929 | struct net_device *dev = t->dev; | |
930 | struct __ip6_tnl_parm *p = &t->parms; | |
931 | struct flowi6 *fl6 = &t->fl.u.ip6; | |
932 | int addend = sizeof(struct ipv6hdr) + 4; | |
933 | ||
934 | if (dev->type != ARPHRD_ETHER) { | |
935 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
936 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
937 | } | |
938 | ||
939 | /* Set up flowi template */ | |
940 | fl6->saddr = p->laddr; | |
941 | fl6->daddr = p->raddr; | |
942 | fl6->flowi6_oif = p->link; | |
943 | fl6->flowlabel = 0; | |
944 | ||
945 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
946 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
947 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
948 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
949 | ||
950 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); | |
951 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
952 | ||
953 | if (p->flags&IP6_TNL_F_CAP_XMIT && | |
954 | p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) | |
955 | dev->flags |= IFF_POINTOPOINT; | |
956 | else | |
957 | dev->flags &= ~IFF_POINTOPOINT; | |
958 | ||
c12b395a | 959 | /* Precalculate GRE options length */ |
960 | if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
961 | if (t->parms.o_flags&GRE_CSUM) | |
962 | addend += 4; | |
963 | if (t->parms.o_flags&GRE_KEY) | |
964 | addend += 4; | |
965 | if (t->parms.o_flags&GRE_SEQ) | |
966 | addend += 4; | |
967 | } | |
bf581759 | 968 | t->hlen = addend; |
c12b395a | 969 | |
970 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
971 | int strict = (ipv6_addr_type(&p->raddr) & | |
972 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
973 | ||
22f08069 | 974 | struct rt6_info *rt = rt6_lookup(t->net, |
c12b395a | 975 | &p->raddr, &p->laddr, |
976 | p->link, strict); | |
977 | ||
63159f29 | 978 | if (!rt) |
c12b395a | 979 | return; |
980 | ||
981 | if (rt->dst.dev) { | |
982 | dev->hard_header_len = rt->dst.dev->hard_header_len + addend; | |
983 | ||
984 | if (set_mtu) { | |
985 | dev->mtu = rt->dst.dev->mtu - addend; | |
986 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
987 | dev->mtu -= 8; | |
988 | ||
989 | if (dev->mtu < IPV6_MIN_MTU) | |
990 | dev->mtu = IPV6_MIN_MTU; | |
991 | } | |
992 | } | |
94e187c0 | 993 | ip6_rt_put(rt); |
c12b395a | 994 | } |
c12b395a | 995 | } |
996 | ||
997 | static int ip6gre_tnl_change(struct ip6_tnl *t, | |
998 | const struct __ip6_tnl_parm *p, int set_mtu) | |
999 | { | |
1000 | t->parms.laddr = p->laddr; | |
1001 | t->parms.raddr = p->raddr; | |
1002 | t->parms.flags = p->flags; | |
1003 | t->parms.hop_limit = p->hop_limit; | |
1004 | t->parms.encap_limit = p->encap_limit; | |
1005 | t->parms.flowinfo = p->flowinfo; | |
1006 | t->parms.link = p->link; | |
1007 | t->parms.proto = p->proto; | |
1008 | t->parms.i_key = p->i_key; | |
1009 | t->parms.o_key = p->o_key; | |
1010 | t->parms.i_flags = p->i_flags; | |
1011 | t->parms.o_flags = p->o_flags; | |
1012 | ip6_tnl_dst_reset(t); | |
1013 | ip6gre_tnl_link_config(t, set_mtu); | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, | |
1018 | const struct ip6_tnl_parm2 *u) | |
1019 | { | |
1020 | p->laddr = u->laddr; | |
1021 | p->raddr = u->raddr; | |
1022 | p->flags = u->flags; | |
1023 | p->hop_limit = u->hop_limit; | |
1024 | p->encap_limit = u->encap_limit; | |
1025 | p->flowinfo = u->flowinfo; | |
1026 | p->link = u->link; | |
1027 | p->i_key = u->i_key; | |
1028 | p->o_key = u->o_key; | |
1029 | p->i_flags = u->i_flags; | |
1030 | p->o_flags = u->o_flags; | |
1031 | memcpy(p->name, u->name, sizeof(u->name)); | |
1032 | } | |
1033 | ||
1034 | static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, | |
1035 | const struct __ip6_tnl_parm *p) | |
1036 | { | |
1037 | u->proto = IPPROTO_GRE; | |
1038 | u->laddr = p->laddr; | |
1039 | u->raddr = p->raddr; | |
1040 | u->flags = p->flags; | |
1041 | u->hop_limit = p->hop_limit; | |
1042 | u->encap_limit = p->encap_limit; | |
1043 | u->flowinfo = p->flowinfo; | |
1044 | u->link = p->link; | |
1045 | u->i_key = p->i_key; | |
1046 | u->o_key = p->o_key; | |
1047 | u->i_flags = p->i_flags; | |
1048 | u->o_flags = p->o_flags; | |
1049 | memcpy(u->name, p->name, sizeof(u->name)); | |
1050 | } | |
1051 | ||
1052 | static int ip6gre_tunnel_ioctl(struct net_device *dev, | |
1053 | struct ifreq *ifr, int cmd) | |
1054 | { | |
1055 | int err = 0; | |
1056 | struct ip6_tnl_parm2 p; | |
1057 | struct __ip6_tnl_parm p1; | |
22f08069 ND |
1058 | struct ip6_tnl *t = netdev_priv(dev); |
1059 | struct net *net = t->net; | |
c12b395a | 1060 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
1061 | ||
1062 | switch (cmd) { | |
1063 | case SIOCGETTUNNEL: | |
c12b395a | 1064 | if (dev == ign->fb_tunnel_dev) { |
1065 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
1066 | err = -EFAULT; | |
1067 | break; | |
1068 | } | |
1069 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1070 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
63159f29 | 1071 | if (!t) |
22f08069 | 1072 | t = netdev_priv(dev); |
c12b395a | 1073 | } |
5dbd5068 | 1074 | memset(&p, 0, sizeof(p)); |
c12b395a | 1075 | ip6gre_tnl_parm_to_user(&p, &t->parms); |
1076 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1077 | err = -EFAULT; | |
1078 | break; | |
1079 | ||
1080 | case SIOCADDTUNNEL: | |
1081 | case SIOCCHGTUNNEL: | |
1082 | err = -EPERM; | |
af31f412 | 1083 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
c12b395a | 1084 | goto done; |
1085 | ||
1086 | err = -EFAULT; | |
1087 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1088 | goto done; | |
1089 | ||
1090 | err = -EINVAL; | |
1091 | if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) | |
1092 | goto done; | |
1093 | ||
1094 | if (!(p.i_flags&GRE_KEY)) | |
1095 | p.i_key = 0; | |
1096 | if (!(p.o_flags&GRE_KEY)) | |
1097 | p.o_key = 0; | |
1098 | ||
1099 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1100 | t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
1101 | ||
1102 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
53b24b8f | 1103 | if (t) { |
c12b395a | 1104 | if (t->dev != dev) { |
1105 | err = -EEXIST; | |
1106 | break; | |
1107 | } | |
1108 | } else { | |
1109 | t = netdev_priv(dev); | |
1110 | ||
1111 | ip6gre_tunnel_unlink(ign, t); | |
1112 | synchronize_net(); | |
1113 | ip6gre_tnl_change(t, &p1, 1); | |
1114 | ip6gre_tunnel_link(ign, t); | |
1115 | netdev_state_change(dev); | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | if (t) { | |
1120 | err = 0; | |
1121 | ||
5dbd5068 | 1122 | memset(&p, 0, sizeof(p)); |
c12b395a | 1123 | ip6gre_tnl_parm_to_user(&p, &t->parms); |
1124 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1125 | err = -EFAULT; | |
1126 | } else | |
1127 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1128 | break; | |
1129 | ||
1130 | case SIOCDELTUNNEL: | |
1131 | err = -EPERM; | |
af31f412 | 1132 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
c12b395a | 1133 | goto done; |
1134 | ||
1135 | if (dev == ign->fb_tunnel_dev) { | |
1136 | err = -EFAULT; | |
1137 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1138 | goto done; | |
1139 | err = -ENOENT; | |
1140 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1141 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
63159f29 | 1142 | if (!t) |
c12b395a | 1143 | goto done; |
1144 | err = -EPERM; | |
1145 | if (t == netdev_priv(ign->fb_tunnel_dev)) | |
1146 | goto done; | |
1147 | dev = t->dev; | |
1148 | } | |
1149 | unregister_netdevice(dev); | |
1150 | err = 0; | |
1151 | break; | |
1152 | ||
1153 | default: | |
1154 | err = -EINVAL; | |
1155 | } | |
1156 | ||
1157 | done: | |
1158 | return err; | |
1159 | } | |
1160 | ||
1161 | static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1162 | { | |
c12b395a | 1163 | if (new_mtu < 68 || |
0e719e3a | 1164 | new_mtu > 0xFFF8 - dev->hard_header_len) |
c12b395a | 1165 | return -EINVAL; |
1166 | dev->mtu = new_mtu; | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, | |
1171 | unsigned short type, | |
1172 | const void *daddr, const void *saddr, unsigned int len) | |
1173 | { | |
1174 | struct ip6_tnl *t = netdev_priv(dev); | |
1175 | struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); | |
1176 | __be16 *p = (__be16 *)(ipv6h+1); | |
1177 | ||
cb1ce2ef TH |
1178 | ip6_flow_hdr(ipv6h, 0, |
1179 | ip6_make_flowlabel(dev_net(dev), skb, | |
42240901 | 1180 | t->fl.u.ip6.flowlabel, true, |
67800f9b | 1181 | &t->fl.u.ip6)); |
c12b395a | 1182 | ipv6h->hop_limit = t->parms.hop_limit; |
1183 | ipv6h->nexthdr = NEXTHDR_GRE; | |
1184 | ipv6h->saddr = t->parms.laddr; | |
1185 | ipv6h->daddr = t->parms.raddr; | |
1186 | ||
1187 | p[0] = t->parms.o_flags; | |
1188 | p[1] = htons(type); | |
1189 | ||
1190 | /* | |
1191 | * Set the source hardware address. | |
1192 | */ | |
1193 | ||
1194 | if (saddr) | |
1195 | memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); | |
1196 | if (daddr) | |
1197 | memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); | |
1198 | if (!ipv6_addr_any(&ipv6h->daddr)) | |
1199 | return t->hlen; | |
1200 | ||
1201 | return -t->hlen; | |
1202 | } | |
1203 | ||
c12b395a | 1204 | static const struct header_ops ip6gre_header_ops = { |
1205 | .create = ip6gre_header, | |
c12b395a | 1206 | }; |
1207 | ||
1208 | static const struct net_device_ops ip6gre_netdev_ops = { | |
1209 | .ndo_init = ip6gre_tunnel_init, | |
1210 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1211 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1212 | .ndo_do_ioctl = ip6gre_tunnel_ioctl, | |
1213 | .ndo_change_mtu = ip6gre_tunnel_change_mtu, | |
f61dd388 | 1214 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 1215 | .ndo_get_iflink = ip6_tnl_get_iflink, |
c12b395a | 1216 | }; |
1217 | ||
1218 | static void ip6gre_dev_free(struct net_device *dev) | |
1219 | { | |
cdf3464e MKL |
1220 | struct ip6_tnl *t = netdev_priv(dev); |
1221 | ||
1222 | ip6_tnl_dst_destroy(t); | |
c12b395a | 1223 | free_percpu(dev->tstats); |
1224 | free_netdev(dev); | |
1225 | } | |
1226 | ||
1227 | static void ip6gre_tunnel_setup(struct net_device *dev) | |
1228 | { | |
1229 | struct ip6_tnl *t; | |
1230 | ||
1231 | dev->netdev_ops = &ip6gre_netdev_ops; | |
1232 | dev->destructor = ip6gre_dev_free; | |
1233 | ||
1234 | dev->type = ARPHRD_IP6GRE; | |
1235 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4; | |
1236 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4; | |
1237 | t = netdev_priv(dev); | |
1238 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1239 | dev->mtu -= 8; | |
1240 | dev->flags |= IFF_NOARP; | |
c12b395a | 1241 | dev->addr_len = sizeof(struct in6_addr); |
02875878 | 1242 | netif_keep_dst(dev); |
c12b395a | 1243 | } |
1244 | ||
a3c119d3 | 1245 | static int ip6gre_tunnel_init_common(struct net_device *dev) |
c12b395a | 1246 | { |
1247 | struct ip6_tnl *tunnel; | |
cdf3464e | 1248 | int ret; |
c12b395a | 1249 | |
1250 | tunnel = netdev_priv(dev); | |
1251 | ||
1252 | tunnel->dev = dev; | |
0bd87628 | 1253 | tunnel->net = dev_net(dev); |
c12b395a | 1254 | strcpy(tunnel->parms.name, dev->name); |
1255 | ||
a3c119d3 MKL |
1256 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
1257 | if (!dev->tstats) | |
1258 | return -ENOMEM; | |
1259 | ||
cdf3464e MKL |
1260 | ret = ip6_tnl_dst_init(tunnel); |
1261 | if (ret) { | |
1262 | free_percpu(dev->tstats); | |
1263 | dev->tstats = NULL; | |
1264 | return ret; | |
1265 | } | |
1266 | ||
a3c119d3 MKL |
1267 | return 0; |
1268 | } | |
1269 | ||
1270 | static int ip6gre_tunnel_init(struct net_device *dev) | |
1271 | { | |
1272 | struct ip6_tnl *tunnel; | |
1273 | int ret; | |
1274 | ||
1275 | ret = ip6gre_tunnel_init_common(dev); | |
1276 | if (ret) | |
1277 | return ret; | |
1278 | ||
1279 | tunnel = netdev_priv(dev); | |
1280 | ||
c12b395a | 1281 | memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); |
1282 | memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); | |
1283 | ||
1284 | if (ipv6_addr_any(&tunnel->parms.raddr)) | |
1285 | dev->header_ops = &ip6gre_header_ops; | |
1286 | ||
c12b395a | 1287 | return 0; |
1288 | } | |
1289 | ||
1290 | static void ip6gre_fb_tunnel_init(struct net_device *dev) | |
1291 | { | |
1292 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1293 | ||
1294 | tunnel->dev = dev; | |
0bd87628 | 1295 | tunnel->net = dev_net(dev); |
c12b395a | 1296 | strcpy(tunnel->parms.name, dev->name); |
1297 | ||
1298 | tunnel->hlen = sizeof(struct ipv6hdr) + 4; | |
1299 | ||
1300 | dev_hold(dev); | |
1301 | } | |
1302 | ||
1303 | ||
1304 | static struct inet6_protocol ip6gre_protocol __read_mostly = { | |
1305 | .handler = ip6gre_rcv, | |
1306 | .err_handler = ip6gre_err, | |
1307 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1308 | }; | |
1309 | ||
22f08069 | 1310 | static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) |
c12b395a | 1311 | { |
22f08069 ND |
1312 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
1313 | struct net_device *dev, *aux; | |
c12b395a | 1314 | int prio; |
1315 | ||
22f08069 ND |
1316 | for_each_netdev_safe(net, dev, aux) |
1317 | if (dev->rtnl_link_ops == &ip6gre_link_ops || | |
1318 | dev->rtnl_link_ops == &ip6gre_tap_ops) | |
1319 | unregister_netdevice_queue(dev, head); | |
1320 | ||
c12b395a | 1321 | for (prio = 0; prio < 4; prio++) { |
1322 | int h; | |
1323 | for (h = 0; h < HASH_SIZE; h++) { | |
1324 | struct ip6_tnl *t; | |
1325 | ||
1326 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
1327 | ||
53b24b8f | 1328 | while (t) { |
22f08069 ND |
1329 | /* If dev is in the same netns, it has already |
1330 | * been added to the list by the previous loop. | |
1331 | */ | |
1332 | if (!net_eq(dev_net(t->dev), net)) | |
1333 | unregister_netdevice_queue(t->dev, | |
1334 | head); | |
c12b395a | 1335 | t = rtnl_dereference(t->next); |
1336 | } | |
1337 | } | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | static int __net_init ip6gre_init_net(struct net *net) | |
1342 | { | |
1343 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1344 | int err; | |
1345 | ||
1346 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", | |
c835a677 TG |
1347 | NET_NAME_UNKNOWN, |
1348 | ip6gre_tunnel_setup); | |
c12b395a | 1349 | if (!ign->fb_tunnel_dev) { |
1350 | err = -ENOMEM; | |
1351 | goto err_alloc_dev; | |
1352 | } | |
1353 | dev_net_set(ign->fb_tunnel_dev, net); | |
22f08069 ND |
1354 | /* FB netdevice is special: we have one, and only one per netns. |
1355 | * Allowing to move it to another netns is clearly unsafe. | |
1356 | */ | |
1357 | ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
1358 | ||
c12b395a | 1359 | |
1360 | ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); | |
1361 | ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; | |
1362 | ||
1363 | err = register_netdev(ign->fb_tunnel_dev); | |
1364 | if (err) | |
1365 | goto err_reg_dev; | |
1366 | ||
1367 | rcu_assign_pointer(ign->tunnels_wc[0], | |
1368 | netdev_priv(ign->fb_tunnel_dev)); | |
1369 | return 0; | |
1370 | ||
1371 | err_reg_dev: | |
1372 | ip6gre_dev_free(ign->fb_tunnel_dev); | |
1373 | err_alloc_dev: | |
1374 | return err; | |
1375 | } | |
1376 | ||
1377 | static void __net_exit ip6gre_exit_net(struct net *net) | |
1378 | { | |
c12b395a | 1379 | LIST_HEAD(list); |
1380 | ||
c12b395a | 1381 | rtnl_lock(); |
22f08069 | 1382 | ip6gre_destroy_tunnels(net, &list); |
c12b395a | 1383 | unregister_netdevice_many(&list); |
1384 | rtnl_unlock(); | |
1385 | } | |
1386 | ||
1387 | static struct pernet_operations ip6gre_net_ops = { | |
1388 | .init = ip6gre_init_net, | |
1389 | .exit = ip6gre_exit_net, | |
1390 | .id = &ip6gre_net_id, | |
1391 | .size = sizeof(struct ip6gre_net), | |
1392 | }; | |
1393 | ||
1394 | static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1395 | { | |
1396 | __be16 flags; | |
1397 | ||
1398 | if (!data) | |
1399 | return 0; | |
1400 | ||
1401 | flags = 0; | |
1402 | if (data[IFLA_GRE_IFLAGS]) | |
1403 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1404 | if (data[IFLA_GRE_OFLAGS]) | |
1405 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1406 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1407 | return -EINVAL; | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1413 | { | |
1414 | struct in6_addr daddr; | |
1415 | ||
1416 | if (tb[IFLA_ADDRESS]) { | |
1417 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1418 | return -EINVAL; | |
1419 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1420 | return -EADDRNOTAVAIL; | |
1421 | } | |
1422 | ||
1423 | if (!data) | |
1424 | goto out; | |
1425 | ||
1426 | if (data[IFLA_GRE_REMOTE]) { | |
67b61f6c | 1427 | daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); |
c12b395a | 1428 | if (ipv6_addr_any(&daddr)) |
1429 | return -EINVAL; | |
1430 | } | |
1431 | ||
1432 | out: | |
1433 | return ip6gre_tunnel_validate(tb, data); | |
1434 | } | |
1435 | ||
1436 | ||
1437 | static void ip6gre_netlink_parms(struct nlattr *data[], | |
1438 | struct __ip6_tnl_parm *parms) | |
1439 | { | |
1440 | memset(parms, 0, sizeof(*parms)); | |
1441 | ||
1442 | if (!data) | |
1443 | return; | |
1444 | ||
1445 | if (data[IFLA_GRE_LINK]) | |
1446 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1447 | ||
1448 | if (data[IFLA_GRE_IFLAGS]) | |
1449 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1450 | ||
1451 | if (data[IFLA_GRE_OFLAGS]) | |
1452 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1453 | ||
1454 | if (data[IFLA_GRE_IKEY]) | |
1455 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1456 | ||
1457 | if (data[IFLA_GRE_OKEY]) | |
1458 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1459 | ||
1460 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 1461 | parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); |
c12b395a | 1462 | |
1463 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 1464 | parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); |
c12b395a | 1465 | |
1466 | if (data[IFLA_GRE_TTL]) | |
1467 | parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); | |
1468 | ||
1469 | if (data[IFLA_GRE_ENCAP_LIMIT]) | |
1470 | parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); | |
1471 | ||
1472 | if (data[IFLA_GRE_FLOWINFO]) | |
1473 | parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]); | |
1474 | ||
1475 | if (data[IFLA_GRE_FLAGS]) | |
1476 | parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); | |
1477 | } | |
1478 | ||
1479 | static int ip6gre_tap_init(struct net_device *dev) | |
1480 | { | |
1481 | struct ip6_tnl *tunnel; | |
a3c119d3 | 1482 | int ret; |
c12b395a | 1483 | |
a3c119d3 MKL |
1484 | ret = ip6gre_tunnel_init_common(dev); |
1485 | if (ret) | |
1486 | return ret; | |
c12b395a | 1487 | |
a3c119d3 | 1488 | tunnel = netdev_priv(dev); |
c12b395a | 1489 | |
1490 | ip6gre_tnl_link_config(tunnel, 1); | |
1491 | ||
c12b395a | 1492 | return 0; |
1493 | } | |
1494 | ||
1495 | static const struct net_device_ops ip6gre_tap_netdev_ops = { | |
1496 | .ndo_init = ip6gre_tap_init, | |
1497 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1498 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1499 | .ndo_set_mac_address = eth_mac_addr, | |
1500 | .ndo_validate_addr = eth_validate_addr, | |
1501 | .ndo_change_mtu = ip6gre_tunnel_change_mtu, | |
f61dd388 | 1502 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 1503 | .ndo_get_iflink = ip6_tnl_get_iflink, |
c12b395a | 1504 | }; |
1505 | ||
1506 | static void ip6gre_tap_setup(struct net_device *dev) | |
1507 | { | |
1508 | ||
1509 | ether_setup(dev); | |
1510 | ||
1511 | dev->netdev_ops = &ip6gre_tap_netdev_ops; | |
1512 | dev->destructor = ip6gre_dev_free; | |
1513 | ||
c12b395a | 1514 | dev->features |= NETIF_F_NETNS_LOCAL; |
1515 | } | |
1516 | ||
1517 | static int ip6gre_newlink(struct net *src_net, struct net_device *dev, | |
1518 | struct nlattr *tb[], struct nlattr *data[]) | |
1519 | { | |
1520 | struct ip6_tnl *nt; | |
1521 | struct net *net = dev_net(dev); | |
1522 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1523 | int err; | |
1524 | ||
1525 | nt = netdev_priv(dev); | |
1526 | ip6gre_netlink_parms(data, &nt->parms); | |
1527 | ||
1528 | if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) | |
1529 | return -EEXIST; | |
1530 | ||
1531 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1532 | eth_hw_addr_random(dev); | |
1533 | ||
1534 | nt->dev = dev; | |
0bd87628 | 1535 | nt->net = dev_net(dev); |
c12b395a | 1536 | ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); |
1537 | ||
1538 | /* Can use a lockless transmit, unless we generate output sequences */ | |
1539 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1540 | dev->features |= NETIF_F_LLTX; | |
1541 | ||
1542 | err = register_netdevice(dev); | |
1543 | if (err) | |
1544 | goto out; | |
1545 | ||
1546 | dev_hold(dev); | |
1547 | ip6gre_tunnel_link(ign, nt); | |
1548 | ||
1549 | out: | |
1550 | return err; | |
1551 | } | |
1552 | ||
1553 | static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1554 | struct nlattr *data[]) | |
1555 | { | |
22f08069 ND |
1556 | struct ip6_tnl *t, *nt = netdev_priv(dev); |
1557 | struct net *net = nt->net; | |
c12b395a | 1558 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
1559 | struct __ip6_tnl_parm p; | |
1560 | ||
1561 | if (dev == ign->fb_tunnel_dev) | |
1562 | return -EINVAL; | |
1563 | ||
c12b395a | 1564 | ip6gre_netlink_parms(data, &p); |
1565 | ||
1566 | t = ip6gre_tunnel_locate(net, &p, 0); | |
1567 | ||
1568 | if (t) { | |
1569 | if (t->dev != dev) | |
1570 | return -EEXIST; | |
1571 | } else { | |
1572 | t = nt; | |
c12b395a | 1573 | } |
1574 | ||
6a61d4db ND |
1575 | ip6gre_tunnel_unlink(ign, t); |
1576 | ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); | |
1577 | ip6gre_tunnel_link(ign, t); | |
c12b395a | 1578 | return 0; |
1579 | } | |
1580 | ||
54d63f78 ND |
1581 | static void ip6gre_dellink(struct net_device *dev, struct list_head *head) |
1582 | { | |
1583 | struct net *net = dev_net(dev); | |
1584 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1585 | ||
1586 | if (dev != ign->fb_tunnel_dev) | |
1587 | unregister_netdevice_queue(dev, head); | |
1588 | } | |
1589 | ||
c12b395a | 1590 | static size_t ip6gre_get_size(const struct net_device *dev) |
1591 | { | |
1592 | return | |
1593 | /* IFLA_GRE_LINK */ | |
1594 | nla_total_size(4) + | |
1595 | /* IFLA_GRE_IFLAGS */ | |
1596 | nla_total_size(2) + | |
1597 | /* IFLA_GRE_OFLAGS */ | |
1598 | nla_total_size(2) + | |
1599 | /* IFLA_GRE_IKEY */ | |
1600 | nla_total_size(4) + | |
1601 | /* IFLA_GRE_OKEY */ | |
1602 | nla_total_size(4) + | |
1603 | /* IFLA_GRE_LOCAL */ | |
a3754133 | 1604 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1605 | /* IFLA_GRE_REMOTE */ |
a3754133 | 1606 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1607 | /* IFLA_GRE_TTL */ |
1608 | nla_total_size(1) + | |
1609 | /* IFLA_GRE_TOS */ | |
1610 | nla_total_size(1) + | |
1611 | /* IFLA_GRE_ENCAP_LIMIT */ | |
1612 | nla_total_size(1) + | |
1613 | /* IFLA_GRE_FLOWINFO */ | |
1614 | nla_total_size(4) + | |
1615 | /* IFLA_GRE_FLAGS */ | |
1616 | nla_total_size(4) + | |
1617 | 0; | |
1618 | } | |
1619 | ||
1620 | static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1621 | { | |
1622 | struct ip6_tnl *t = netdev_priv(dev); | |
1623 | struct __ip6_tnl_parm *p = &t->parms; | |
1624 | ||
1625 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || | |
1626 | nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || | |
1627 | nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || | |
1628 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || | |
1629 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1630 | nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || |
1631 | nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || | |
c12b395a | 1632 | nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || |
1633 | /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/ | |
1634 | nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || | |
1635 | nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || | |
1636 | nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) | |
1637 | goto nla_put_failure; | |
1638 | return 0; | |
1639 | ||
1640 | nla_put_failure: | |
1641 | return -EMSGSIZE; | |
1642 | } | |
1643 | ||
1644 | static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { | |
1645 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1646 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1647 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1648 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1649 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
1650 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, | |
1651 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, | |
1652 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, | |
1653 | [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1654 | [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, | |
1655 | [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, | |
1656 | }; | |
1657 | ||
1658 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { | |
1659 | .kind = "ip6gre", | |
1660 | .maxtype = IFLA_GRE_MAX, | |
1661 | .policy = ip6gre_policy, | |
1662 | .priv_size = sizeof(struct ip6_tnl), | |
1663 | .setup = ip6gre_tunnel_setup, | |
1664 | .validate = ip6gre_tunnel_validate, | |
1665 | .newlink = ip6gre_newlink, | |
1666 | .changelink = ip6gre_changelink, | |
54d63f78 | 1667 | .dellink = ip6gre_dellink, |
c12b395a | 1668 | .get_size = ip6gre_get_size, |
1669 | .fill_info = ip6gre_fill_info, | |
1728d4fa | 1670 | .get_link_net = ip6_tnl_get_link_net, |
c12b395a | 1671 | }; |
1672 | ||
1673 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { | |
1674 | .kind = "ip6gretap", | |
1675 | .maxtype = IFLA_GRE_MAX, | |
1676 | .policy = ip6gre_policy, | |
1677 | .priv_size = sizeof(struct ip6_tnl), | |
1678 | .setup = ip6gre_tap_setup, | |
1679 | .validate = ip6gre_tap_validate, | |
1680 | .newlink = ip6gre_newlink, | |
1681 | .changelink = ip6gre_changelink, | |
1682 | .get_size = ip6gre_get_size, | |
1683 | .fill_info = ip6gre_fill_info, | |
3390e397 | 1684 | .get_link_net = ip6_tnl_get_link_net, |
c12b395a | 1685 | }; |
1686 | ||
1687 | /* | |
1688 | * And now the modules code and kernel interface. | |
1689 | */ | |
1690 | ||
1691 | static int __init ip6gre_init(void) | |
1692 | { | |
1693 | int err; | |
1694 | ||
1695 | pr_info("GRE over IPv6 tunneling driver\n"); | |
1696 | ||
1697 | err = register_pernet_device(&ip6gre_net_ops); | |
1698 | if (err < 0) | |
1699 | return err; | |
1700 | ||
1701 | err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1702 | if (err < 0) { | |
1703 | pr_info("%s: can't add protocol\n", __func__); | |
1704 | goto add_proto_failed; | |
1705 | } | |
1706 | ||
1707 | err = rtnl_link_register(&ip6gre_link_ops); | |
1708 | if (err < 0) | |
1709 | goto rtnl_link_failed; | |
1710 | ||
1711 | err = rtnl_link_register(&ip6gre_tap_ops); | |
1712 | if (err < 0) | |
1713 | goto tap_ops_failed; | |
1714 | ||
1715 | out: | |
1716 | return err; | |
1717 | ||
1718 | tap_ops_failed: | |
1719 | rtnl_link_unregister(&ip6gre_link_ops); | |
1720 | rtnl_link_failed: | |
1721 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1722 | add_proto_failed: | |
1723 | unregister_pernet_device(&ip6gre_net_ops); | |
1724 | goto out; | |
1725 | } | |
1726 | ||
1727 | static void __exit ip6gre_fini(void) | |
1728 | { | |
1729 | rtnl_link_unregister(&ip6gre_tap_ops); | |
1730 | rtnl_link_unregister(&ip6gre_link_ops); | |
1731 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1732 | unregister_pernet_device(&ip6gre_net_ops); | |
1733 | } | |
1734 | ||
1735 | module_init(ip6gre_init); | |
1736 | module_exit(ip6gre_fini); | |
1737 | MODULE_LICENSE("GPL"); | |
1738 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); | |
1739 | MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); | |
1740 | MODULE_ALIAS_RTNL_LINK("ip6gre"); | |
5a4ee9a9 | 1741 | MODULE_ALIAS_RTNL_LINK("ip6gretap"); |
c12b395a | 1742 | MODULE_ALIAS_NETDEV("ip6gre0"); |