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> | |
27 | #include <linux/mroute.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/inetdevice.h> | |
31 | #include <linux/igmp.h> | |
32 | #include <linux/netfilter_ipv4.h> | |
33 | #include <linux/etherdevice.h> | |
34 | #include <linux/if_ether.h> | |
35 | #include <linux/hash.h> | |
36 | #include <linux/if_tunnel.h> | |
37 | #include <linux/ip6_tunnel.h> | |
38 | ||
39 | #include <net/sock.h> | |
40 | #include <net/ip.h> | |
c5441932 | 41 | #include <net/ip_tunnels.h> |
c12b395a | 42 | #include <net/icmp.h> |
43 | #include <net/protocol.h> | |
44 | #include <net/addrconf.h> | |
45 | #include <net/arp.h> | |
46 | #include <net/checksum.h> | |
47 | #include <net/dsfield.h> | |
48 | #include <net/inet_ecn.h> | |
49 | #include <net/xfrm.h> | |
50 | #include <net/net_namespace.h> | |
51 | #include <net/netns/generic.h> | |
52 | #include <net/rtnetlink.h> | |
53 | ||
54 | #include <net/ipv6.h> | |
55 | #include <net/ip6_fib.h> | |
56 | #include <net/ip6_route.h> | |
57 | #include <net/ip6_tunnel.h> | |
58 | ||
59 | ||
eccc1bb8 | 60 | static bool log_ecn_error = true; |
61 | module_param(log_ecn_error, bool, 0644); | |
62 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
63 | ||
c12b395a | 64 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) |
65 | #define IPV6_TCLASS_SHIFT 20 | |
66 | ||
67 | #define HASH_SIZE_SHIFT 5 | |
68 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
69 | ||
70 | static int ip6gre_net_id __read_mostly; | |
71 | struct ip6gre_net { | |
72 | struct ip6_tnl __rcu *tunnels[4][HASH_SIZE]; | |
73 | ||
74 | struct net_device *fb_tunnel_dev; | |
75 | }; | |
76 | ||
77 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly; | |
78 | static int ip6gre_tunnel_init(struct net_device *dev); | |
79 | static void ip6gre_tunnel_setup(struct net_device *dev); | |
80 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); | |
81 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); | |
82 | ||
83 | /* Tunnel hash table */ | |
84 | ||
85 | /* | |
86 | 4 hash tables: | |
87 | ||
88 | 3: (remote,local) | |
89 | 2: (remote,*) | |
90 | 1: (*,local) | |
91 | 0: (*,*) | |
92 | ||
93 | We require exact key match i.e. if a key is present in packet | |
94 | it will match only tunnel with the same key; if it is not present, | |
95 | it will match only keyless tunnel. | |
96 | ||
97 | All keysless packets, if not matched configured keyless tunnels | |
98 | will match fallback tunnel. | |
99 | */ | |
100 | ||
101 | #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1)) | |
102 | static u32 HASH_ADDR(const struct in6_addr *addr) | |
103 | { | |
104 | u32 hash = ipv6_addr_hash(addr); | |
105 | ||
106 | return hash_32(hash, HASH_SIZE_SHIFT); | |
107 | } | |
108 | ||
109 | #define tunnels_r_l tunnels[3] | |
110 | #define tunnels_r tunnels[2] | |
111 | #define tunnels_l tunnels[1] | |
112 | #define tunnels_wc tunnels[0] | |
c12b395a | 113 | |
c12b395a | 114 | /* Given src, dst and key, find appropriate for input tunnel. */ |
115 | ||
116 | static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, | |
117 | const struct in6_addr *remote, const struct in6_addr *local, | |
118 | __be32 key, __be16 gre_proto) | |
119 | { | |
120 | struct net *net = dev_net(dev); | |
121 | int link = dev->ifindex; | |
122 | unsigned int h0 = HASH_ADDR(remote); | |
123 | unsigned int h1 = HASH_KEY(key); | |
124 | struct ip6_tnl *t, *cand = NULL; | |
125 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
126 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? | |
127 | ARPHRD_ETHER : ARPHRD_IP6GRE; | |
128 | int score, cand_score = 4; | |
129 | ||
e086cadc | 130 | for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
c12b395a | 131 | if (!ipv6_addr_equal(local, &t->parms.laddr) || |
132 | !ipv6_addr_equal(remote, &t->parms.raddr) || | |
133 | key != t->parms.i_key || | |
134 | !(t->dev->flags & IFF_UP)) | |
135 | continue; | |
136 | ||
137 | if (t->dev->type != ARPHRD_IP6GRE && | |
138 | t->dev->type != dev_type) | |
139 | continue; | |
140 | ||
141 | score = 0; | |
142 | if (t->parms.link != link) | |
143 | score |= 1; | |
144 | if (t->dev->type != dev_type) | |
145 | score |= 2; | |
146 | if (score == 0) | |
147 | return t; | |
148 | ||
149 | if (score < cand_score) { | |
150 | cand = t; | |
151 | cand_score = score; | |
152 | } | |
153 | } | |
154 | ||
e086cadc | 155 | for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
c12b395a | 156 | if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
157 | key != t->parms.i_key || | |
158 | !(t->dev->flags & IFF_UP)) | |
159 | continue; | |
160 | ||
161 | if (t->dev->type != ARPHRD_IP6GRE && | |
162 | t->dev->type != dev_type) | |
163 | continue; | |
164 | ||
165 | score = 0; | |
166 | if (t->parms.link != link) | |
167 | score |= 1; | |
168 | if (t->dev->type != dev_type) | |
169 | score |= 2; | |
170 | if (score == 0) | |
171 | return t; | |
172 | ||
173 | if (score < cand_score) { | |
174 | cand = t; | |
175 | cand_score = score; | |
176 | } | |
177 | } | |
178 | ||
e086cadc | 179 | for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
c12b395a | 180 | if ((!ipv6_addr_equal(local, &t->parms.laddr) && |
181 | (!ipv6_addr_equal(local, &t->parms.raddr) || | |
182 | !ipv6_addr_is_multicast(local))) || | |
183 | key != t->parms.i_key || | |
184 | !(t->dev->flags & IFF_UP)) | |
185 | continue; | |
186 | ||
187 | if (t->dev->type != ARPHRD_IP6GRE && | |
188 | t->dev->type != dev_type) | |
189 | continue; | |
190 | ||
191 | score = 0; | |
192 | if (t->parms.link != link) | |
193 | score |= 1; | |
194 | if (t->dev->type != dev_type) | |
195 | score |= 2; | |
196 | if (score == 0) | |
197 | return t; | |
198 | ||
199 | if (score < cand_score) { | |
200 | cand = t; | |
201 | cand_score = score; | |
202 | } | |
203 | } | |
204 | ||
e086cadc | 205 | for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
c12b395a | 206 | if (t->parms.i_key != key || |
207 | !(t->dev->flags & IFF_UP)) | |
208 | continue; | |
209 | ||
210 | if (t->dev->type != ARPHRD_IP6GRE && | |
211 | t->dev->type != dev_type) | |
212 | continue; | |
213 | ||
214 | score = 0; | |
215 | if (t->parms.link != link) | |
216 | score |= 1; | |
217 | if (t->dev->type != dev_type) | |
218 | score |= 2; | |
219 | if (score == 0) | |
220 | return t; | |
221 | ||
222 | if (score < cand_score) { | |
223 | cand = t; | |
224 | cand_score = score; | |
225 | } | |
226 | } | |
227 | ||
228 | if (cand != NULL) | |
229 | return cand; | |
230 | ||
231 | dev = ign->fb_tunnel_dev; | |
232 | if (dev->flags & IFF_UP) | |
233 | return netdev_priv(dev); | |
234 | ||
235 | return NULL; | |
236 | } | |
237 | ||
238 | static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, | |
239 | const struct __ip6_tnl_parm *p) | |
240 | { | |
241 | const struct in6_addr *remote = &p->raddr; | |
242 | const struct in6_addr *local = &p->laddr; | |
243 | unsigned int h = HASH_KEY(p->i_key); | |
244 | int prio = 0; | |
245 | ||
246 | if (!ipv6_addr_any(local)) | |
247 | prio |= 1; | |
248 | if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { | |
249 | prio |= 2; | |
250 | h ^= HASH_ADDR(remote); | |
251 | } | |
252 | ||
253 | return &ign->tunnels[prio][h]; | |
254 | } | |
255 | ||
256 | static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, | |
257 | const struct ip6_tnl *t) | |
258 | { | |
259 | return __ip6gre_bucket(ign, &t->parms); | |
260 | } | |
261 | ||
262 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) | |
263 | { | |
264 | struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); | |
265 | ||
266 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
267 | rcu_assign_pointer(*tp, t); | |
268 | } | |
269 | ||
270 | static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) | |
271 | { | |
272 | struct ip6_tnl __rcu **tp; | |
273 | struct ip6_tnl *iter; | |
274 | ||
275 | for (tp = ip6gre_bucket(ign, t); | |
276 | (iter = rtnl_dereference(*tp)) != NULL; | |
277 | tp = &iter->next) { | |
278 | if (t == iter) { | |
279 | rcu_assign_pointer(*tp, t->next); | |
280 | break; | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
285 | static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, | |
286 | const struct __ip6_tnl_parm *parms, | |
287 | int type) | |
288 | { | |
289 | const struct in6_addr *remote = &parms->raddr; | |
290 | const struct in6_addr *local = &parms->laddr; | |
291 | __be32 key = parms->i_key; | |
292 | int link = parms->link; | |
293 | struct ip6_tnl *t; | |
294 | struct ip6_tnl __rcu **tp; | |
295 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
296 | ||
297 | for (tp = __ip6gre_bucket(ign, parms); | |
298 | (t = rtnl_dereference(*tp)) != NULL; | |
299 | tp = &t->next) | |
300 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
301 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
302 | key == t->parms.i_key && | |
303 | link == t->parms.link && | |
304 | type == t->dev->type) | |
305 | break; | |
306 | ||
307 | return t; | |
308 | } | |
309 | ||
310 | static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, | |
311 | const struct __ip6_tnl_parm *parms, int create) | |
312 | { | |
313 | struct ip6_tnl *t, *nt; | |
314 | struct net_device *dev; | |
315 | char name[IFNAMSIZ]; | |
316 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
317 | ||
318 | t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); | |
319 | if (t || !create) | |
320 | return t; | |
321 | ||
322 | if (parms->name[0]) | |
323 | strlcpy(name, parms->name, IFNAMSIZ); | |
324 | else | |
325 | strcpy(name, "ip6gre%d"); | |
326 | ||
327 | dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup); | |
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 | { | |
359 | struct net *net = dev_net(dev); | |
360 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
361 | ||
362 | ip6gre_tunnel_unlink(ign, netdev_priv(dev)); | |
363 | dev_put(dev); | |
364 | } | |
365 | ||
366 | ||
367 | static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
368 | u8 type, u8 code, int offset, __be32 info) | |
369 | { | |
370 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; | |
b87fb39e ED |
371 | __be16 *p = (__be16 *)(skb->data + offset); |
372 | int grehlen = offset + 4; | |
c12b395a | 373 | struct ip6_tnl *t; |
374 | __be16 flags; | |
375 | ||
376 | flags = p[0]; | |
377 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
378 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
379 | return; | |
380 | if (flags&GRE_KEY) { | |
381 | grehlen += 4; | |
382 | if (flags&GRE_CSUM) | |
383 | grehlen += 4; | |
384 | } | |
385 | } | |
386 | ||
387 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
b87fb39e | 388 | if (!pskb_may_pull(skb, grehlen)) |
c12b395a | 389 | return; |
b87fb39e ED |
390 | ipv6h = (const struct ipv6hdr *)skb->data; |
391 | p = (__be16 *)(skb->data + offset); | |
c12b395a | 392 | |
c12b395a | 393 | t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, |
394 | flags & GRE_KEY ? | |
395 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
396 | p[1]); | |
397 | if (t == NULL) | |
0c5794a6 | 398 | return; |
c12b395a | 399 | |
400 | switch (type) { | |
401 | __u32 teli; | |
402 | struct ipv6_tlv_tnl_enc_lim *tel; | |
403 | __u32 mtu; | |
404 | case ICMPV6_DEST_UNREACH: | |
405 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", | |
406 | t->parms.name); | |
407 | break; | |
408 | case ICMPV6_TIME_EXCEED: | |
409 | if (code == ICMPV6_EXC_HOPLIMIT) { | |
410 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", | |
411 | t->parms.name); | |
412 | } | |
413 | break; | |
414 | case ICMPV6_PARAMPROB: | |
415 | teli = 0; | |
416 | if (code == ICMPV6_HDR_FIELD) | |
417 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); | |
418 | ||
419 | if (teli && teli == info - 2) { | |
420 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; | |
421 | if (tel->encap_limit == 0) { | |
422 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", | |
423 | t->parms.name); | |
424 | } | |
425 | } else { | |
426 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
427 | t->parms.name); | |
428 | } | |
429 | break; | |
430 | case ICMPV6_PKT_TOOBIG: | |
431 | mtu = info - offset; | |
432 | if (mtu < IPV6_MIN_MTU) | |
433 | mtu = IPV6_MIN_MTU; | |
434 | t->dev->mtu = mtu; | |
435 | break; | |
436 | } | |
437 | ||
438 | if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) | |
439 | t->err_count++; | |
440 | else | |
441 | t->err_count = 1; | |
442 | t->err_time = jiffies; | |
c12b395a | 443 | } |
444 | ||
c12b395a | 445 | static int ip6gre_rcv(struct sk_buff *skb) |
446 | { | |
447 | const struct ipv6hdr *ipv6h; | |
448 | u8 *h; | |
449 | __be16 flags; | |
450 | __sum16 csum = 0; | |
451 | __be32 key = 0; | |
452 | u32 seqno = 0; | |
453 | struct ip6_tnl *tunnel; | |
454 | int offset = 4; | |
455 | __be16 gre_proto; | |
eccc1bb8 | 456 | int err; |
c12b395a | 457 | |
458 | if (!pskb_may_pull(skb, sizeof(struct in6_addr))) | |
0c5794a6 | 459 | goto drop; |
c12b395a | 460 | |
461 | ipv6h = ipv6_hdr(skb); | |
462 | h = skb->data; | |
463 | flags = *(__be16 *)h; | |
464 | ||
465 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
466 | /* - Version must be 0. | |
467 | - We do not support routing headers. | |
468 | */ | |
469 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
0c5794a6 | 470 | goto drop; |
c12b395a | 471 | |
472 | if (flags&GRE_CSUM) { | |
473 | switch (skb->ip_summed) { | |
474 | case CHECKSUM_COMPLETE: | |
475 | csum = csum_fold(skb->csum); | |
476 | if (!csum) | |
477 | break; | |
478 | /* fall through */ | |
479 | case CHECKSUM_NONE: | |
480 | skb->csum = 0; | |
481 | csum = __skb_checksum_complete(skb); | |
482 | skb->ip_summed = CHECKSUM_COMPLETE; | |
483 | } | |
484 | offset += 4; | |
485 | } | |
486 | if (flags&GRE_KEY) { | |
487 | key = *(__be32 *)(h + offset); | |
488 | offset += 4; | |
489 | } | |
490 | if (flags&GRE_SEQ) { | |
491 | seqno = ntohl(*(__be32 *)(h + offset)); | |
492 | offset += 4; | |
493 | } | |
494 | } | |
495 | ||
496 | gre_proto = *(__be16 *)(h + 2); | |
497 | ||
c12b395a | 498 | tunnel = ip6gre_tunnel_lookup(skb->dev, |
499 | &ipv6h->saddr, &ipv6h->daddr, key, | |
500 | gre_proto); | |
501 | if (tunnel) { | |
502 | struct pcpu_tstats *tstats; | |
503 | ||
504 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
505 | goto drop; | |
506 | ||
507 | if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) { | |
508 | tunnel->dev->stats.rx_dropped++; | |
509 | goto drop; | |
510 | } | |
511 | ||
c12b395a | 512 | skb->protocol = gre_proto; |
513 | /* WCCP version 1 and 2 protocol decoding. | |
514 | * - Change protocol to IP | |
515 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
516 | */ | |
517 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { | |
518 | skb->protocol = htons(ETH_P_IP); | |
519 | if ((*(h + offset) & 0xF0) != 0x40) | |
520 | offset += 4; | |
521 | } | |
522 | ||
523 | skb->mac_header = skb->network_header; | |
524 | __pskb_pull(skb, offset); | |
525 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); | |
c12b395a | 526 | |
527 | if (((flags&GRE_CSUM) && csum) || | |
528 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
529 | tunnel->dev->stats.rx_crc_errors++; | |
530 | tunnel->dev->stats.rx_errors++; | |
531 | goto drop; | |
532 | } | |
533 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
534 | if (!(flags&GRE_SEQ) || | |
535 | (tunnel->i_seqno && | |
536 | (s32)(seqno - tunnel->i_seqno) < 0)) { | |
537 | tunnel->dev->stats.rx_fifo_errors++; | |
538 | tunnel->dev->stats.rx_errors++; | |
539 | goto drop; | |
540 | } | |
541 | tunnel->i_seqno = seqno + 1; | |
542 | } | |
543 | ||
544 | /* Warning: All skb pointers will be invalidated! */ | |
545 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
546 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
547 | tunnel->dev->stats.rx_length_errors++; | |
548 | tunnel->dev->stats.rx_errors++; | |
549 | goto drop; | |
550 | } | |
551 | ||
552 | ipv6h = ipv6_hdr(skb); | |
553 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
554 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
555 | } | |
556 | ||
ea23192e | 557 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); |
eccc1bb8 | 558 | |
559 | skb_reset_network_header(skb); | |
560 | ||
561 | err = IP6_ECN_decapsulate(ipv6h, skb); | |
562 | if (unlikely(err)) { | |
563 | if (log_ecn_error) | |
564 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
565 | &ipv6h->saddr, | |
566 | ipv6_get_dsfield(ipv6h)); | |
567 | if (err > 1) { | |
568 | ++tunnel->dev->stats.rx_frame_errors; | |
569 | ++tunnel->dev->stats.rx_errors; | |
570 | goto drop; | |
571 | } | |
572 | } | |
573 | ||
c12b395a | 574 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
575 | u64_stats_update_begin(&tstats->syncp); | |
576 | tstats->rx_packets++; | |
577 | tstats->rx_bytes += skb->len; | |
578 | u64_stats_update_end(&tstats->syncp); | |
579 | ||
c12b395a | 580 | netif_rx(skb); |
581 | ||
c12b395a | 582 | return 0; |
583 | } | |
584 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
585 | ||
586 | drop: | |
c12b395a | 587 | kfree_skb(skb); |
588 | return 0; | |
589 | } | |
590 | ||
591 | struct ipv6_tel_txoption { | |
592 | struct ipv6_txoptions ops; | |
593 | __u8 dst_opt[8]; | |
594 | }; | |
595 | ||
596 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) | |
597 | { | |
598 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
599 | ||
600 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; | |
601 | opt->dst_opt[3] = 1; | |
602 | opt->dst_opt[4] = encap_limit; | |
603 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
604 | opt->dst_opt[6] = 1; | |
605 | ||
606 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; | |
607 | opt->ops.opt_nflen = 8; | |
608 | } | |
609 | ||
610 | static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, | |
611 | struct net_device *dev, | |
612 | __u8 dsfield, | |
613 | struct flowi6 *fl6, | |
614 | int encap_limit, | |
615 | __u32 *pmtu) | |
616 | { | |
617 | struct net *net = dev_net(dev); | |
618 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
619 | struct net_device *tdev; /* Device to other host */ | |
620 | struct ipv6hdr *ipv6h; /* Our new IP header */ | |
621 | unsigned int max_headroom; /* The extra header space needed */ | |
622 | int gre_hlen; | |
623 | struct ipv6_tel_txoption opt; | |
624 | int mtu; | |
625 | struct dst_entry *dst = NULL, *ndst = NULL; | |
626 | struct net_device_stats *stats = &tunnel->dev->stats; | |
627 | int err = -1; | |
628 | u8 proto; | |
c12b395a | 629 | struct sk_buff *new_skb; |
630 | ||
631 | if (dev->type == ARPHRD_ETHER) | |
632 | IPCB(skb)->flags = 0; | |
633 | ||
634 | if (dev->header_ops && dev->type == ARPHRD_IP6GRE) { | |
635 | gre_hlen = 0; | |
636 | ipv6h = (struct ipv6hdr *)skb->data; | |
637 | fl6->daddr = ipv6h->daddr; | |
638 | } else { | |
639 | gre_hlen = tunnel->hlen; | |
640 | fl6->daddr = tunnel->parms.raddr; | |
641 | } | |
642 | ||
643 | if (!fl6->flowi6_mark) | |
644 | dst = ip6_tnl_dst_check(tunnel); | |
645 | ||
646 | if (!dst) { | |
647 | ndst = ip6_route_output(net, NULL, fl6); | |
648 | ||
649 | if (ndst->error) | |
650 | goto tx_err_link_failure; | |
651 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); | |
652 | if (IS_ERR(ndst)) { | |
653 | err = PTR_ERR(ndst); | |
654 | ndst = NULL; | |
655 | goto tx_err_link_failure; | |
656 | } | |
657 | dst = ndst; | |
658 | } | |
659 | ||
660 | tdev = dst->dev; | |
661 | ||
662 | if (tdev == dev) { | |
663 | stats->collisions++; | |
664 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
665 | tunnel->parms.name); | |
666 | goto tx_err_dst_release; | |
667 | } | |
668 | ||
669 | mtu = dst_mtu(dst) - sizeof(*ipv6h); | |
670 | if (encap_limit >= 0) { | |
671 | max_headroom += 8; | |
672 | mtu -= 8; | |
673 | } | |
674 | if (mtu < IPV6_MIN_MTU) | |
675 | mtu = IPV6_MIN_MTU; | |
676 | if (skb_dst(skb)) | |
677 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
678 | if (skb->len > mtu) { | |
679 | *pmtu = mtu; | |
680 | err = -EMSGSIZE; | |
681 | goto tx_err_dst_release; | |
682 | } | |
683 | ||
684 | if (tunnel->err_count > 0) { | |
685 | if (time_before(jiffies, | |
686 | tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
687 | tunnel->err_count--; | |
688 | ||
689 | dst_link_failure(skb); | |
690 | } else | |
691 | tunnel->err_count = 0; | |
692 | } | |
693 | ||
963a88b3 ND |
694 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); |
695 | ||
c12b395a | 696 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; |
697 | ||
698 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
699 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
700 | new_skb = skb_realloc_headroom(skb, max_headroom); | |
701 | if (max_headroom > dev->needed_headroom) | |
702 | dev->needed_headroom = max_headroom; | |
703 | if (!new_skb) | |
704 | goto tx_err_dst_release; | |
705 | ||
706 | if (skb->sk) | |
707 | skb_set_owner_w(new_skb, skb->sk); | |
708 | consume_skb(skb); | |
709 | skb = new_skb; | |
710 | } | |
711 | ||
c12b395a | 712 | if (fl6->flowi6_mark) { |
713 | skb_dst_set(skb, dst); | |
714 | ndst = NULL; | |
715 | } else { | |
716 | skb_dst_set_noref(skb, dst); | |
717 | } | |
718 | ||
c12b395a | 719 | proto = NEXTHDR_GRE; |
720 | if (encap_limit >= 0) { | |
721 | init_tel_txopt(&opt, encap_limit); | |
722 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
723 | } | |
724 | ||
3d483058 HFS |
725 | if (likely(!skb->encapsulation)) { |
726 | skb_reset_inner_headers(skb); | |
727 | skb->encapsulation = 1; | |
728 | } | |
729 | ||
c12b395a | 730 | skb_push(skb, gre_hlen); |
731 | skb_reset_network_header(skb); | |
ae782bb1 | 732 | skb_set_transport_header(skb, sizeof(*ipv6h)); |
c12b395a | 733 | |
734 | /* | |
735 | * Push down and install the IP header. | |
736 | */ | |
737 | ipv6h = ipv6_hdr(skb); | |
3e4e4c1f | 738 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
c12b395a | 739 | ipv6h->hop_limit = tunnel->parms.hop_limit; |
740 | ipv6h->nexthdr = proto; | |
741 | ipv6h->saddr = fl6->saddr; | |
742 | ipv6h->daddr = fl6->daddr; | |
743 | ||
744 | ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags; | |
745 | ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
746 | htons(ETH_P_TEB) : skb->protocol; | |
747 | ||
748 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
749 | __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4); | |
750 | ||
751 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
752 | ++tunnel->o_seqno; | |
753 | *ptr = htonl(tunnel->o_seqno); | |
754 | ptr--; | |
755 | } | |
756 | if (tunnel->parms.o_flags&GRE_KEY) { | |
757 | *ptr = tunnel->parms.o_key; | |
758 | ptr--; | |
759 | } | |
760 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
761 | *ptr = 0; | |
762 | *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1), | |
763 | skb->len - sizeof(struct ipv6hdr)); | |
764 | } | |
765 | } | |
766 | ||
e8f72ea4 | 767 | ip6tunnel_xmit(skb, dev); |
c12b395a | 768 | if (ndst) |
769 | ip6_tnl_dst_store(tunnel, ndst); | |
c12b395a | 770 | return 0; |
771 | tx_err_link_failure: | |
772 | stats->tx_carrier_errors++; | |
773 | dst_link_failure(skb); | |
774 | tx_err_dst_release: | |
775 | dst_release(ndst); | |
776 | return err; | |
777 | } | |
778 | ||
779 | static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) | |
780 | { | |
781 | struct ip6_tnl *t = netdev_priv(dev); | |
782 | const struct iphdr *iph = ip_hdr(skb); | |
783 | int encap_limit = -1; | |
784 | struct flowi6 fl6; | |
785 | __u8 dsfield; | |
786 | __u32 mtu; | |
787 | int err; | |
788 | ||
789 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
790 | encap_limit = t->parms.encap_limit; | |
791 | ||
792 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
793 | fl6.flowi6_proto = IPPROTO_IPIP; | |
794 | ||
795 | dsfield = ipv4_get_dsfield(iph); | |
796 | ||
797 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
798 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) | |
799 | & IPV6_TCLASS_MASK; | |
800 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
801 | fl6.flowi6_mark = skb->mark; | |
802 | ||
803 | err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); | |
804 | if (err != 0) { | |
805 | /* XXX: send ICMP error even if DF is not set. */ | |
806 | if (err == -EMSGSIZE) | |
807 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
808 | htonl(mtu)); | |
809 | return -1; | |
810 | } | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) | |
816 | { | |
817 | struct ip6_tnl *t = netdev_priv(dev); | |
818 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
819 | int encap_limit = -1; | |
820 | __u16 offset; | |
821 | struct flowi6 fl6; | |
822 | __u8 dsfield; | |
823 | __u32 mtu; | |
824 | int err; | |
825 | ||
826 | if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) | |
827 | return -1; | |
828 | ||
829 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); | |
830 | if (offset > 0) { | |
831 | struct ipv6_tlv_tnl_enc_lim *tel; | |
832 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; | |
833 | if (tel->encap_limit == 0) { | |
834 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
835 | ICMPV6_HDR_FIELD, offset + 2); | |
836 | return -1; | |
837 | } | |
838 | encap_limit = tel->encap_limit - 1; | |
839 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
840 | encap_limit = t->parms.encap_limit; | |
841 | ||
842 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
843 | fl6.flowi6_proto = IPPROTO_IPV6; | |
844 | ||
845 | dsfield = ipv6_get_dsfield(ipv6h); | |
846 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
847 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
848 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) | |
849 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
850 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
851 | fl6.flowi6_mark = skb->mark; | |
852 | ||
853 | err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); | |
854 | if (err != 0) { | |
855 | if (err == -EMSGSIZE) | |
856 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
857 | return -1; | |
858 | } | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
863 | /** | |
864 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
865 | * @t: the outgoing tunnel device | |
866 | * @hdr: IPv6 header from the incoming packet | |
867 | * | |
868 | * Description: | |
869 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
870 | * doesn't match source of incoming packet. | |
871 | * | |
872 | * Return: | |
873 | * 1 if conflict, | |
874 | * 0 else | |
875 | **/ | |
876 | ||
877 | static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, | |
878 | const struct ipv6hdr *hdr) | |
879 | { | |
880 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
881 | } | |
882 | ||
883 | static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) | |
884 | { | |
885 | struct ip6_tnl *t = netdev_priv(dev); | |
886 | int encap_limit = -1; | |
887 | struct flowi6 fl6; | |
888 | __u32 mtu; | |
889 | int err; | |
890 | ||
891 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
892 | encap_limit = t->parms.encap_limit; | |
893 | ||
894 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
895 | fl6.flowi6_proto = skb->protocol; | |
896 | ||
897 | err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu); | |
898 | ||
899 | return err; | |
900 | } | |
901 | ||
902 | static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, | |
903 | struct net_device *dev) | |
904 | { | |
905 | struct ip6_tnl *t = netdev_priv(dev); | |
906 | struct net_device_stats *stats = &t->dev->stats; | |
907 | int ret; | |
908 | ||
909 | if (!ip6_tnl_xmit_ctl(t)) | |
41ab3e31 | 910 | goto tx_err; |
c12b395a | 911 | |
912 | switch (skb->protocol) { | |
913 | case htons(ETH_P_IP): | |
914 | ret = ip6gre_xmit_ipv4(skb, dev); | |
915 | break; | |
916 | case htons(ETH_P_IPV6): | |
917 | ret = ip6gre_xmit_ipv6(skb, dev); | |
918 | break; | |
919 | default: | |
920 | ret = ip6gre_xmit_other(skb, dev); | |
921 | break; | |
922 | } | |
923 | ||
924 | if (ret < 0) | |
925 | goto tx_err; | |
926 | ||
927 | return NETDEV_TX_OK; | |
928 | ||
929 | tx_err: | |
930 | stats->tx_errors++; | |
931 | stats->tx_dropped++; | |
932 | kfree_skb(skb); | |
933 | return NETDEV_TX_OK; | |
934 | } | |
935 | ||
936 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) | |
937 | { | |
938 | struct net_device *dev = t->dev; | |
939 | struct __ip6_tnl_parm *p = &t->parms; | |
940 | struct flowi6 *fl6 = &t->fl.u.ip6; | |
941 | int addend = sizeof(struct ipv6hdr) + 4; | |
942 | ||
943 | if (dev->type != ARPHRD_ETHER) { | |
944 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
945 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
946 | } | |
947 | ||
948 | /* Set up flowi template */ | |
949 | fl6->saddr = p->laddr; | |
950 | fl6->daddr = p->raddr; | |
951 | fl6->flowi6_oif = p->link; | |
952 | fl6->flowlabel = 0; | |
953 | ||
954 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
955 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
956 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
957 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
958 | ||
959 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); | |
960 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
961 | ||
962 | if (p->flags&IP6_TNL_F_CAP_XMIT && | |
963 | p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) | |
964 | dev->flags |= IFF_POINTOPOINT; | |
965 | else | |
966 | dev->flags &= ~IFF_POINTOPOINT; | |
967 | ||
968 | dev->iflink = p->link; | |
969 | ||
970 | /* Precalculate GRE options length */ | |
971 | if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
972 | if (t->parms.o_flags&GRE_CSUM) | |
973 | addend += 4; | |
974 | if (t->parms.o_flags&GRE_KEY) | |
975 | addend += 4; | |
976 | if (t->parms.o_flags&GRE_SEQ) | |
977 | addend += 4; | |
978 | } | |
979 | ||
980 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
981 | int strict = (ipv6_addr_type(&p->raddr) & | |
982 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
983 | ||
984 | struct rt6_info *rt = rt6_lookup(dev_net(dev), | |
985 | &p->raddr, &p->laddr, | |
986 | p->link, strict); | |
987 | ||
988 | if (rt == NULL) | |
989 | return; | |
990 | ||
991 | if (rt->dst.dev) { | |
992 | dev->hard_header_len = rt->dst.dev->hard_header_len + addend; | |
993 | ||
994 | if (set_mtu) { | |
995 | dev->mtu = rt->dst.dev->mtu - addend; | |
996 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
997 | dev->mtu -= 8; | |
998 | ||
999 | if (dev->mtu < IPV6_MIN_MTU) | |
1000 | dev->mtu = IPV6_MIN_MTU; | |
1001 | } | |
1002 | } | |
94e187c0 | 1003 | ip6_rt_put(rt); |
c12b395a | 1004 | } |
1005 | ||
1006 | t->hlen = addend; | |
1007 | } | |
1008 | ||
1009 | static int ip6gre_tnl_change(struct ip6_tnl *t, | |
1010 | const struct __ip6_tnl_parm *p, int set_mtu) | |
1011 | { | |
1012 | t->parms.laddr = p->laddr; | |
1013 | t->parms.raddr = p->raddr; | |
1014 | t->parms.flags = p->flags; | |
1015 | t->parms.hop_limit = p->hop_limit; | |
1016 | t->parms.encap_limit = p->encap_limit; | |
1017 | t->parms.flowinfo = p->flowinfo; | |
1018 | t->parms.link = p->link; | |
1019 | t->parms.proto = p->proto; | |
1020 | t->parms.i_key = p->i_key; | |
1021 | t->parms.o_key = p->o_key; | |
1022 | t->parms.i_flags = p->i_flags; | |
1023 | t->parms.o_flags = p->o_flags; | |
1024 | ip6_tnl_dst_reset(t); | |
1025 | ip6gre_tnl_link_config(t, set_mtu); | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, | |
1030 | const struct ip6_tnl_parm2 *u) | |
1031 | { | |
1032 | p->laddr = u->laddr; | |
1033 | p->raddr = u->raddr; | |
1034 | p->flags = u->flags; | |
1035 | p->hop_limit = u->hop_limit; | |
1036 | p->encap_limit = u->encap_limit; | |
1037 | p->flowinfo = u->flowinfo; | |
1038 | p->link = u->link; | |
1039 | p->i_key = u->i_key; | |
1040 | p->o_key = u->o_key; | |
1041 | p->i_flags = u->i_flags; | |
1042 | p->o_flags = u->o_flags; | |
1043 | memcpy(p->name, u->name, sizeof(u->name)); | |
1044 | } | |
1045 | ||
1046 | static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, | |
1047 | const struct __ip6_tnl_parm *p) | |
1048 | { | |
1049 | u->proto = IPPROTO_GRE; | |
1050 | u->laddr = p->laddr; | |
1051 | u->raddr = p->raddr; | |
1052 | u->flags = p->flags; | |
1053 | u->hop_limit = p->hop_limit; | |
1054 | u->encap_limit = p->encap_limit; | |
1055 | u->flowinfo = p->flowinfo; | |
1056 | u->link = p->link; | |
1057 | u->i_key = p->i_key; | |
1058 | u->o_key = p->o_key; | |
1059 | u->i_flags = p->i_flags; | |
1060 | u->o_flags = p->o_flags; | |
1061 | memcpy(u->name, p->name, sizeof(u->name)); | |
1062 | } | |
1063 | ||
1064 | static int ip6gre_tunnel_ioctl(struct net_device *dev, | |
1065 | struct ifreq *ifr, int cmd) | |
1066 | { | |
1067 | int err = 0; | |
1068 | struct ip6_tnl_parm2 p; | |
1069 | struct __ip6_tnl_parm p1; | |
1070 | struct ip6_tnl *t; | |
1071 | struct net *net = dev_net(dev); | |
1072 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1073 | ||
1074 | switch (cmd) { | |
1075 | case SIOCGETTUNNEL: | |
1076 | t = NULL; | |
1077 | if (dev == ign->fb_tunnel_dev) { | |
1078 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
1079 | err = -EFAULT; | |
1080 | break; | |
1081 | } | |
1082 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1083 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
1084 | } | |
1085 | if (t == NULL) | |
1086 | t = netdev_priv(dev); | |
5dbd5068 | 1087 | memset(&p, 0, sizeof(p)); |
c12b395a | 1088 | ip6gre_tnl_parm_to_user(&p, &t->parms); |
1089 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1090 | err = -EFAULT; | |
1091 | break; | |
1092 | ||
1093 | case SIOCADDTUNNEL: | |
1094 | case SIOCCHGTUNNEL: | |
1095 | err = -EPERM; | |
af31f412 | 1096 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
c12b395a | 1097 | goto done; |
1098 | ||
1099 | err = -EFAULT; | |
1100 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1101 | goto done; | |
1102 | ||
1103 | err = -EINVAL; | |
1104 | if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) | |
1105 | goto done; | |
1106 | ||
1107 | if (!(p.i_flags&GRE_KEY)) | |
1108 | p.i_key = 0; | |
1109 | if (!(p.o_flags&GRE_KEY)) | |
1110 | p.o_key = 0; | |
1111 | ||
1112 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1113 | t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
1114 | ||
1115 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
1116 | if (t != NULL) { | |
1117 | if (t->dev != dev) { | |
1118 | err = -EEXIST; | |
1119 | break; | |
1120 | } | |
1121 | } else { | |
1122 | t = netdev_priv(dev); | |
1123 | ||
1124 | ip6gre_tunnel_unlink(ign, t); | |
1125 | synchronize_net(); | |
1126 | ip6gre_tnl_change(t, &p1, 1); | |
1127 | ip6gre_tunnel_link(ign, t); | |
1128 | netdev_state_change(dev); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | if (t) { | |
1133 | err = 0; | |
1134 | ||
5dbd5068 | 1135 | memset(&p, 0, sizeof(p)); |
c12b395a | 1136 | ip6gre_tnl_parm_to_user(&p, &t->parms); |
1137 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1138 | err = -EFAULT; | |
1139 | } else | |
1140 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1141 | break; | |
1142 | ||
1143 | case SIOCDELTUNNEL: | |
1144 | err = -EPERM; | |
af31f412 | 1145 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
c12b395a | 1146 | goto done; |
1147 | ||
1148 | if (dev == ign->fb_tunnel_dev) { | |
1149 | err = -EFAULT; | |
1150 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1151 | goto done; | |
1152 | err = -ENOENT; | |
1153 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1154 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
1155 | if (t == NULL) | |
1156 | goto done; | |
1157 | err = -EPERM; | |
1158 | if (t == netdev_priv(ign->fb_tunnel_dev)) | |
1159 | goto done; | |
1160 | dev = t->dev; | |
1161 | } | |
1162 | unregister_netdevice(dev); | |
1163 | err = 0; | |
1164 | break; | |
1165 | ||
1166 | default: | |
1167 | err = -EINVAL; | |
1168 | } | |
1169 | ||
1170 | done: | |
1171 | return err; | |
1172 | } | |
1173 | ||
1174 | static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1175 | { | |
1176 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1177 | if (new_mtu < 68 || | |
1178 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1179 | return -EINVAL; | |
1180 | dev->mtu = new_mtu; | |
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, | |
1185 | unsigned short type, | |
1186 | const void *daddr, const void *saddr, unsigned int len) | |
1187 | { | |
1188 | struct ip6_tnl *t = netdev_priv(dev); | |
1189 | struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); | |
1190 | __be16 *p = (__be16 *)(ipv6h+1); | |
1191 | ||
3e4e4c1f | 1192 | ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel); |
c12b395a | 1193 | ipv6h->hop_limit = t->parms.hop_limit; |
1194 | ipv6h->nexthdr = NEXTHDR_GRE; | |
1195 | ipv6h->saddr = t->parms.laddr; | |
1196 | ipv6h->daddr = t->parms.raddr; | |
1197 | ||
1198 | p[0] = t->parms.o_flags; | |
1199 | p[1] = htons(type); | |
1200 | ||
1201 | /* | |
1202 | * Set the source hardware address. | |
1203 | */ | |
1204 | ||
1205 | if (saddr) | |
1206 | memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); | |
1207 | if (daddr) | |
1208 | memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); | |
1209 | if (!ipv6_addr_any(&ipv6h->daddr)) | |
1210 | return t->hlen; | |
1211 | ||
1212 | return -t->hlen; | |
1213 | } | |
1214 | ||
c12b395a | 1215 | static const struct header_ops ip6gre_header_ops = { |
1216 | .create = ip6gre_header, | |
c12b395a | 1217 | }; |
1218 | ||
1219 | static const struct net_device_ops ip6gre_netdev_ops = { | |
1220 | .ndo_init = ip6gre_tunnel_init, | |
1221 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1222 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1223 | .ndo_do_ioctl = ip6gre_tunnel_ioctl, | |
1224 | .ndo_change_mtu = ip6gre_tunnel_change_mtu, | |
f61dd388 | 1225 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
c12b395a | 1226 | }; |
1227 | ||
1228 | static void ip6gre_dev_free(struct net_device *dev) | |
1229 | { | |
1230 | free_percpu(dev->tstats); | |
1231 | free_netdev(dev); | |
1232 | } | |
1233 | ||
1234 | static void ip6gre_tunnel_setup(struct net_device *dev) | |
1235 | { | |
1236 | struct ip6_tnl *t; | |
1237 | ||
1238 | dev->netdev_ops = &ip6gre_netdev_ops; | |
1239 | dev->destructor = ip6gre_dev_free; | |
1240 | ||
1241 | dev->type = ARPHRD_IP6GRE; | |
1242 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4; | |
1243 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4; | |
1244 | t = netdev_priv(dev); | |
1245 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1246 | dev->mtu -= 8; | |
1247 | dev->flags |= IFF_NOARP; | |
1248 | dev->iflink = 0; | |
1249 | dev->addr_len = sizeof(struct in6_addr); | |
1250 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1251 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
1252 | } | |
1253 | ||
1254 | static int ip6gre_tunnel_init(struct net_device *dev) | |
1255 | { | |
1256 | struct ip6_tnl *tunnel; | |
1257 | ||
1258 | tunnel = netdev_priv(dev); | |
1259 | ||
1260 | tunnel->dev = dev; | |
0bd87628 | 1261 | tunnel->net = dev_net(dev); |
c12b395a | 1262 | strcpy(tunnel->parms.name, dev->name); |
1263 | ||
1264 | memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); | |
1265 | memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); | |
1266 | ||
1267 | if (ipv6_addr_any(&tunnel->parms.raddr)) | |
1268 | dev->header_ops = &ip6gre_header_ops; | |
1269 | ||
1270 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1271 | if (!dev->tstats) | |
1272 | return -ENOMEM; | |
1273 | ||
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | static void ip6gre_fb_tunnel_init(struct net_device *dev) | |
1278 | { | |
1279 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1280 | ||
1281 | tunnel->dev = dev; | |
0bd87628 | 1282 | tunnel->net = dev_net(dev); |
c12b395a | 1283 | strcpy(tunnel->parms.name, dev->name); |
1284 | ||
1285 | tunnel->hlen = sizeof(struct ipv6hdr) + 4; | |
1286 | ||
1287 | dev_hold(dev); | |
1288 | } | |
1289 | ||
1290 | ||
1291 | static struct inet6_protocol ip6gre_protocol __read_mostly = { | |
1292 | .handler = ip6gre_rcv, | |
1293 | .err_handler = ip6gre_err, | |
1294 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1295 | }; | |
1296 | ||
1297 | static void ip6gre_destroy_tunnels(struct ip6gre_net *ign, | |
1298 | struct list_head *head) | |
1299 | { | |
1300 | int prio; | |
1301 | ||
1302 | for (prio = 0; prio < 4; prio++) { | |
1303 | int h; | |
1304 | for (h = 0; h < HASH_SIZE; h++) { | |
1305 | struct ip6_tnl *t; | |
1306 | ||
1307 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
1308 | ||
1309 | while (t != NULL) { | |
1310 | unregister_netdevice_queue(t->dev, head); | |
1311 | t = rtnl_dereference(t->next); | |
1312 | } | |
1313 | } | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | static int __net_init ip6gre_init_net(struct net *net) | |
1318 | { | |
1319 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1320 | int err; | |
1321 | ||
1322 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", | |
1323 | ip6gre_tunnel_setup); | |
1324 | if (!ign->fb_tunnel_dev) { | |
1325 | err = -ENOMEM; | |
1326 | goto err_alloc_dev; | |
1327 | } | |
1328 | dev_net_set(ign->fb_tunnel_dev, net); | |
1329 | ||
1330 | ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); | |
1331 | ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; | |
1332 | ||
1333 | err = register_netdev(ign->fb_tunnel_dev); | |
1334 | if (err) | |
1335 | goto err_reg_dev; | |
1336 | ||
1337 | rcu_assign_pointer(ign->tunnels_wc[0], | |
1338 | netdev_priv(ign->fb_tunnel_dev)); | |
1339 | return 0; | |
1340 | ||
1341 | err_reg_dev: | |
1342 | ip6gre_dev_free(ign->fb_tunnel_dev); | |
1343 | err_alloc_dev: | |
1344 | return err; | |
1345 | } | |
1346 | ||
1347 | static void __net_exit ip6gre_exit_net(struct net *net) | |
1348 | { | |
1349 | struct ip6gre_net *ign; | |
1350 | LIST_HEAD(list); | |
1351 | ||
1352 | ign = net_generic(net, ip6gre_net_id); | |
1353 | rtnl_lock(); | |
1354 | ip6gre_destroy_tunnels(ign, &list); | |
1355 | unregister_netdevice_many(&list); | |
1356 | rtnl_unlock(); | |
1357 | } | |
1358 | ||
1359 | static struct pernet_operations ip6gre_net_ops = { | |
1360 | .init = ip6gre_init_net, | |
1361 | .exit = ip6gre_exit_net, | |
1362 | .id = &ip6gre_net_id, | |
1363 | .size = sizeof(struct ip6gre_net), | |
1364 | }; | |
1365 | ||
1366 | static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1367 | { | |
1368 | __be16 flags; | |
1369 | ||
1370 | if (!data) | |
1371 | return 0; | |
1372 | ||
1373 | flags = 0; | |
1374 | if (data[IFLA_GRE_IFLAGS]) | |
1375 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1376 | if (data[IFLA_GRE_OFLAGS]) | |
1377 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1378 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1379 | return -EINVAL; | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1385 | { | |
1386 | struct in6_addr daddr; | |
1387 | ||
1388 | if (tb[IFLA_ADDRESS]) { | |
1389 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1390 | return -EINVAL; | |
1391 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1392 | return -EADDRNOTAVAIL; | |
1393 | } | |
1394 | ||
1395 | if (!data) | |
1396 | goto out; | |
1397 | ||
1398 | if (data[IFLA_GRE_REMOTE]) { | |
1399 | nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); | |
1400 | if (ipv6_addr_any(&daddr)) | |
1401 | return -EINVAL; | |
1402 | } | |
1403 | ||
1404 | out: | |
1405 | return ip6gre_tunnel_validate(tb, data); | |
1406 | } | |
1407 | ||
1408 | ||
1409 | static void ip6gre_netlink_parms(struct nlattr *data[], | |
1410 | struct __ip6_tnl_parm *parms) | |
1411 | { | |
1412 | memset(parms, 0, sizeof(*parms)); | |
1413 | ||
1414 | if (!data) | |
1415 | return; | |
1416 | ||
1417 | if (data[IFLA_GRE_LINK]) | |
1418 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1419 | ||
1420 | if (data[IFLA_GRE_IFLAGS]) | |
1421 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1422 | ||
1423 | if (data[IFLA_GRE_OFLAGS]) | |
1424 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1425 | ||
1426 | if (data[IFLA_GRE_IKEY]) | |
1427 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1428 | ||
1429 | if (data[IFLA_GRE_OKEY]) | |
1430 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1431 | ||
1432 | if (data[IFLA_GRE_LOCAL]) | |
1433 | nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr)); | |
1434 | ||
1435 | if (data[IFLA_GRE_REMOTE]) | |
1436 | nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); | |
1437 | ||
1438 | if (data[IFLA_GRE_TTL]) | |
1439 | parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); | |
1440 | ||
1441 | if (data[IFLA_GRE_ENCAP_LIMIT]) | |
1442 | parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); | |
1443 | ||
1444 | if (data[IFLA_GRE_FLOWINFO]) | |
1445 | parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]); | |
1446 | ||
1447 | if (data[IFLA_GRE_FLAGS]) | |
1448 | parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); | |
1449 | } | |
1450 | ||
1451 | static int ip6gre_tap_init(struct net_device *dev) | |
1452 | { | |
1453 | struct ip6_tnl *tunnel; | |
1454 | ||
1455 | tunnel = netdev_priv(dev); | |
1456 | ||
1457 | tunnel->dev = dev; | |
0bd87628 | 1458 | tunnel->net = dev_net(dev); |
c12b395a | 1459 | strcpy(tunnel->parms.name, dev->name); |
1460 | ||
1461 | ip6gre_tnl_link_config(tunnel, 1); | |
1462 | ||
1463 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1464 | if (!dev->tstats) | |
1465 | return -ENOMEM; | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | static const struct net_device_ops ip6gre_tap_netdev_ops = { | |
1471 | .ndo_init = ip6gre_tap_init, | |
1472 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1473 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1474 | .ndo_set_mac_address = eth_mac_addr, | |
1475 | .ndo_validate_addr = eth_validate_addr, | |
1476 | .ndo_change_mtu = ip6gre_tunnel_change_mtu, | |
f61dd388 | 1477 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
c12b395a | 1478 | }; |
1479 | ||
1480 | static void ip6gre_tap_setup(struct net_device *dev) | |
1481 | { | |
1482 | ||
1483 | ether_setup(dev); | |
1484 | ||
1485 | dev->netdev_ops = &ip6gre_tap_netdev_ops; | |
1486 | dev->destructor = ip6gre_dev_free; | |
1487 | ||
1488 | dev->iflink = 0; | |
1489 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1490 | } | |
1491 | ||
1492 | static int ip6gre_newlink(struct net *src_net, struct net_device *dev, | |
1493 | struct nlattr *tb[], struct nlattr *data[]) | |
1494 | { | |
1495 | struct ip6_tnl *nt; | |
1496 | struct net *net = dev_net(dev); | |
1497 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1498 | int err; | |
1499 | ||
1500 | nt = netdev_priv(dev); | |
1501 | ip6gre_netlink_parms(data, &nt->parms); | |
1502 | ||
1503 | if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) | |
1504 | return -EEXIST; | |
1505 | ||
1506 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1507 | eth_hw_addr_random(dev); | |
1508 | ||
1509 | nt->dev = dev; | |
0bd87628 | 1510 | nt->net = dev_net(dev); |
c12b395a | 1511 | ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); |
1512 | ||
1513 | /* Can use a lockless transmit, unless we generate output sequences */ | |
1514 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1515 | dev->features |= NETIF_F_LLTX; | |
1516 | ||
1517 | err = register_netdevice(dev); | |
1518 | if (err) | |
1519 | goto out; | |
1520 | ||
1521 | dev_hold(dev); | |
1522 | ip6gre_tunnel_link(ign, nt); | |
1523 | ||
1524 | out: | |
1525 | return err; | |
1526 | } | |
1527 | ||
1528 | static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1529 | struct nlattr *data[]) | |
1530 | { | |
1531 | struct ip6_tnl *t, *nt; | |
1532 | struct net *net = dev_net(dev); | |
1533 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1534 | struct __ip6_tnl_parm p; | |
1535 | ||
1536 | if (dev == ign->fb_tunnel_dev) | |
1537 | return -EINVAL; | |
1538 | ||
1539 | nt = netdev_priv(dev); | |
1540 | ip6gre_netlink_parms(data, &p); | |
1541 | ||
1542 | t = ip6gre_tunnel_locate(net, &p, 0); | |
1543 | ||
1544 | if (t) { | |
1545 | if (t->dev != dev) | |
1546 | return -EEXIST; | |
1547 | } else { | |
1548 | t = nt; | |
1549 | ||
1550 | ip6gre_tunnel_unlink(ign, t); | |
1551 | ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); | |
1552 | ip6gre_tunnel_link(ign, t); | |
1553 | netdev_state_change(dev); | |
1554 | } | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | static size_t ip6gre_get_size(const struct net_device *dev) | |
1560 | { | |
1561 | return | |
1562 | /* IFLA_GRE_LINK */ | |
1563 | nla_total_size(4) + | |
1564 | /* IFLA_GRE_IFLAGS */ | |
1565 | nla_total_size(2) + | |
1566 | /* IFLA_GRE_OFLAGS */ | |
1567 | nla_total_size(2) + | |
1568 | /* IFLA_GRE_IKEY */ | |
1569 | nla_total_size(4) + | |
1570 | /* IFLA_GRE_OKEY */ | |
1571 | nla_total_size(4) + | |
1572 | /* IFLA_GRE_LOCAL */ | |
a3754133 | 1573 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1574 | /* IFLA_GRE_REMOTE */ |
a3754133 | 1575 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1576 | /* IFLA_GRE_TTL */ |
1577 | nla_total_size(1) + | |
1578 | /* IFLA_GRE_TOS */ | |
1579 | nla_total_size(1) + | |
1580 | /* IFLA_GRE_ENCAP_LIMIT */ | |
1581 | nla_total_size(1) + | |
1582 | /* IFLA_GRE_FLOWINFO */ | |
1583 | nla_total_size(4) + | |
1584 | /* IFLA_GRE_FLAGS */ | |
1585 | nla_total_size(4) + | |
1586 | 0; | |
1587 | } | |
1588 | ||
1589 | static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1590 | { | |
1591 | struct ip6_tnl *t = netdev_priv(dev); | |
1592 | struct __ip6_tnl_parm *p = &t->parms; | |
1593 | ||
1594 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || | |
1595 | nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || | |
1596 | nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || | |
1597 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || | |
1598 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
a3754133 ND |
1599 | nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) || |
1600 | nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) || | |
c12b395a | 1601 | nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || |
1602 | /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/ | |
1603 | nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || | |
1604 | nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || | |
1605 | nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) | |
1606 | goto nla_put_failure; | |
1607 | return 0; | |
1608 | ||
1609 | nla_put_failure: | |
1610 | return -EMSGSIZE; | |
1611 | } | |
1612 | ||
1613 | static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { | |
1614 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1615 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1616 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1617 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1618 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
1619 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, | |
1620 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, | |
1621 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, | |
1622 | [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1623 | [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, | |
1624 | [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, | |
1625 | }; | |
1626 | ||
1627 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { | |
1628 | .kind = "ip6gre", | |
1629 | .maxtype = IFLA_GRE_MAX, | |
1630 | .policy = ip6gre_policy, | |
1631 | .priv_size = sizeof(struct ip6_tnl), | |
1632 | .setup = ip6gre_tunnel_setup, | |
1633 | .validate = ip6gre_tunnel_validate, | |
1634 | .newlink = ip6gre_newlink, | |
1635 | .changelink = ip6gre_changelink, | |
1636 | .get_size = ip6gre_get_size, | |
1637 | .fill_info = ip6gre_fill_info, | |
1638 | }; | |
1639 | ||
1640 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { | |
1641 | .kind = "ip6gretap", | |
1642 | .maxtype = IFLA_GRE_MAX, | |
1643 | .policy = ip6gre_policy, | |
1644 | .priv_size = sizeof(struct ip6_tnl), | |
1645 | .setup = ip6gre_tap_setup, | |
1646 | .validate = ip6gre_tap_validate, | |
1647 | .newlink = ip6gre_newlink, | |
1648 | .changelink = ip6gre_changelink, | |
1649 | .get_size = ip6gre_get_size, | |
1650 | .fill_info = ip6gre_fill_info, | |
1651 | }; | |
1652 | ||
1653 | /* | |
1654 | * And now the modules code and kernel interface. | |
1655 | */ | |
1656 | ||
1657 | static int __init ip6gre_init(void) | |
1658 | { | |
1659 | int err; | |
1660 | ||
1661 | pr_info("GRE over IPv6 tunneling driver\n"); | |
1662 | ||
1663 | err = register_pernet_device(&ip6gre_net_ops); | |
1664 | if (err < 0) | |
1665 | return err; | |
1666 | ||
1667 | err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1668 | if (err < 0) { | |
1669 | pr_info("%s: can't add protocol\n", __func__); | |
1670 | goto add_proto_failed; | |
1671 | } | |
1672 | ||
1673 | err = rtnl_link_register(&ip6gre_link_ops); | |
1674 | if (err < 0) | |
1675 | goto rtnl_link_failed; | |
1676 | ||
1677 | err = rtnl_link_register(&ip6gre_tap_ops); | |
1678 | if (err < 0) | |
1679 | goto tap_ops_failed; | |
1680 | ||
1681 | out: | |
1682 | return err; | |
1683 | ||
1684 | tap_ops_failed: | |
1685 | rtnl_link_unregister(&ip6gre_link_ops); | |
1686 | rtnl_link_failed: | |
1687 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1688 | add_proto_failed: | |
1689 | unregister_pernet_device(&ip6gre_net_ops); | |
1690 | goto out; | |
1691 | } | |
1692 | ||
1693 | static void __exit ip6gre_fini(void) | |
1694 | { | |
1695 | rtnl_link_unregister(&ip6gre_tap_ops); | |
1696 | rtnl_link_unregister(&ip6gre_link_ops); | |
1697 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1698 | unregister_pernet_device(&ip6gre_net_ops); | |
1699 | } | |
1700 | ||
1701 | module_init(ip6gre_init); | |
1702 | module_exit(ip6gre_fini); | |
1703 | MODULE_LICENSE("GPL"); | |
1704 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); | |
1705 | MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); | |
1706 | MODULE_ALIAS_RTNL_LINK("ip6gre"); | |
1707 | MODULE_ALIAS_NETDEV("ip6gre0"); |