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> | |
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 IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) |
64 | #define IPV6_TCLASS_SHIFT 20 | |
65 | ||
66 | #define HASH_SIZE_SHIFT 5 | |
67 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
68 | ||
69 | static int ip6gre_net_id __read_mostly; | |
70 | struct ip6gre_net { | |
71 | struct ip6_tnl __rcu *tunnels[4][HASH_SIZE]; | |
72 | ||
73 | struct net_device *fb_tunnel_dev; | |
74 | }; | |
75 | ||
76 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly; | |
77 | static int ip6gre_tunnel_init(struct net_device *dev); | |
78 | static void ip6gre_tunnel_setup(struct net_device *dev); | |
79 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); | |
80 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); | |
81 | ||
82 | /* Tunnel hash table */ | |
83 | ||
84 | /* | |
85 | 4 hash tables: | |
86 | ||
87 | 3: (remote,local) | |
88 | 2: (remote,*) | |
89 | 1: (*,local) | |
90 | 0: (*,*) | |
91 | ||
92 | We require exact key match i.e. if a key is present in packet | |
93 | it will match only tunnel with the same key; if it is not present, | |
94 | it will match only keyless tunnel. | |
95 | ||
96 | All keysless packets, if not matched configured keyless tunnels | |
97 | will match fallback tunnel. | |
98 | */ | |
99 | ||
100 | #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1)) | |
101 | static u32 HASH_ADDR(const struct in6_addr *addr) | |
102 | { | |
103 | u32 hash = ipv6_addr_hash(addr); | |
104 | ||
105 | return hash_32(hash, HASH_SIZE_SHIFT); | |
106 | } | |
107 | ||
108 | #define tunnels_r_l tunnels[3] | |
109 | #define tunnels_r tunnels[2] | |
110 | #define tunnels_l tunnels[1] | |
111 | #define tunnels_wc tunnels[0] | |
c12b395a | 112 | |
c12b395a | 113 | static struct rtnl_link_stats64 *ip6gre_get_stats64(struct net_device *dev, |
114 | struct rtnl_link_stats64 *tot) | |
115 | { | |
116 | int i; | |
117 | ||
118 | for_each_possible_cpu(i) { | |
119 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
120 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
121 | unsigned int start; | |
122 | ||
123 | do { | |
124 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
125 | rx_packets = tstats->rx_packets; | |
126 | tx_packets = tstats->tx_packets; | |
127 | rx_bytes = tstats->rx_bytes; | |
128 | tx_bytes = tstats->tx_bytes; | |
129 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
130 | ||
131 | tot->rx_packets += rx_packets; | |
132 | tot->tx_packets += tx_packets; | |
133 | tot->rx_bytes += rx_bytes; | |
134 | tot->tx_bytes += tx_bytes; | |
135 | } | |
136 | ||
137 | tot->multicast = dev->stats.multicast; | |
138 | tot->rx_crc_errors = dev->stats.rx_crc_errors; | |
139 | tot->rx_fifo_errors = dev->stats.rx_fifo_errors; | |
140 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
eccc1bb8 | 141 | tot->rx_frame_errors = dev->stats.rx_frame_errors; |
c12b395a | 142 | tot->rx_errors = dev->stats.rx_errors; |
eccc1bb8 | 143 | |
c12b395a | 144 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
145 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
146 | tot->tx_dropped = dev->stats.tx_dropped; | |
147 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
148 | tot->tx_errors = dev->stats.tx_errors; | |
149 | ||
150 | return tot; | |
151 | } | |
152 | ||
153 | /* Given src, dst and key, find appropriate for input tunnel. */ | |
154 | ||
155 | static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, | |
156 | const struct in6_addr *remote, const struct in6_addr *local, | |
157 | __be32 key, __be16 gre_proto) | |
158 | { | |
159 | struct net *net = dev_net(dev); | |
160 | int link = dev->ifindex; | |
161 | unsigned int h0 = HASH_ADDR(remote); | |
162 | unsigned int h1 = HASH_KEY(key); | |
163 | struct ip6_tnl *t, *cand = NULL; | |
164 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
165 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? | |
166 | ARPHRD_ETHER : ARPHRD_IP6GRE; | |
167 | int score, cand_score = 4; | |
168 | ||
e086cadc | 169 | for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
c12b395a | 170 | if (!ipv6_addr_equal(local, &t->parms.laddr) || |
171 | !ipv6_addr_equal(remote, &t->parms.raddr) || | |
172 | key != t->parms.i_key || | |
173 | !(t->dev->flags & IFF_UP)) | |
174 | continue; | |
175 | ||
176 | if (t->dev->type != ARPHRD_IP6GRE && | |
177 | t->dev->type != dev_type) | |
178 | continue; | |
179 | ||
180 | score = 0; | |
181 | if (t->parms.link != link) | |
182 | score |= 1; | |
183 | if (t->dev->type != dev_type) | |
184 | score |= 2; | |
185 | if (score == 0) | |
186 | return t; | |
187 | ||
188 | if (score < cand_score) { | |
189 | cand = t; | |
190 | cand_score = score; | |
191 | } | |
192 | } | |
193 | ||
e086cadc | 194 | for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
c12b395a | 195 | if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
196 | key != t->parms.i_key || | |
197 | !(t->dev->flags & IFF_UP)) | |
198 | continue; | |
199 | ||
200 | if (t->dev->type != ARPHRD_IP6GRE && | |
201 | t->dev->type != dev_type) | |
202 | continue; | |
203 | ||
204 | score = 0; | |
205 | if (t->parms.link != link) | |
206 | score |= 1; | |
207 | if (t->dev->type != dev_type) | |
208 | score |= 2; | |
209 | if (score == 0) | |
210 | return t; | |
211 | ||
212 | if (score < cand_score) { | |
213 | cand = t; | |
214 | cand_score = score; | |
215 | } | |
216 | } | |
217 | ||
e086cadc | 218 | for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
c12b395a | 219 | if ((!ipv6_addr_equal(local, &t->parms.laddr) && |
220 | (!ipv6_addr_equal(local, &t->parms.raddr) || | |
221 | !ipv6_addr_is_multicast(local))) || | |
222 | key != t->parms.i_key || | |
223 | !(t->dev->flags & IFF_UP)) | |
224 | continue; | |
225 | ||
226 | if (t->dev->type != ARPHRD_IP6GRE && | |
227 | t->dev->type != dev_type) | |
228 | continue; | |
229 | ||
230 | score = 0; | |
231 | if (t->parms.link != link) | |
232 | score |= 1; | |
233 | if (t->dev->type != dev_type) | |
234 | score |= 2; | |
235 | if (score == 0) | |
236 | return t; | |
237 | ||
238 | if (score < cand_score) { | |
239 | cand = t; | |
240 | cand_score = score; | |
241 | } | |
242 | } | |
243 | ||
e086cadc | 244 | for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
c12b395a | 245 | if (t->parms.i_key != key || |
246 | !(t->dev->flags & IFF_UP)) | |
247 | continue; | |
248 | ||
249 | if (t->dev->type != ARPHRD_IP6GRE && | |
250 | t->dev->type != dev_type) | |
251 | continue; | |
252 | ||
253 | score = 0; | |
254 | if (t->parms.link != link) | |
255 | score |= 1; | |
256 | if (t->dev->type != dev_type) | |
257 | score |= 2; | |
258 | if (score == 0) | |
259 | return t; | |
260 | ||
261 | if (score < cand_score) { | |
262 | cand = t; | |
263 | cand_score = score; | |
264 | } | |
265 | } | |
266 | ||
267 | if (cand != NULL) | |
268 | return cand; | |
269 | ||
270 | dev = ign->fb_tunnel_dev; | |
271 | if (dev->flags & IFF_UP) | |
272 | return netdev_priv(dev); | |
273 | ||
274 | return NULL; | |
275 | } | |
276 | ||
277 | static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, | |
278 | const struct __ip6_tnl_parm *p) | |
279 | { | |
280 | const struct in6_addr *remote = &p->raddr; | |
281 | const struct in6_addr *local = &p->laddr; | |
282 | unsigned int h = HASH_KEY(p->i_key); | |
283 | int prio = 0; | |
284 | ||
285 | if (!ipv6_addr_any(local)) | |
286 | prio |= 1; | |
287 | if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { | |
288 | prio |= 2; | |
289 | h ^= HASH_ADDR(remote); | |
290 | } | |
291 | ||
292 | return &ign->tunnels[prio][h]; | |
293 | } | |
294 | ||
295 | static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, | |
296 | const struct ip6_tnl *t) | |
297 | { | |
298 | return __ip6gre_bucket(ign, &t->parms); | |
299 | } | |
300 | ||
301 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) | |
302 | { | |
303 | struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); | |
304 | ||
305 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
306 | rcu_assign_pointer(*tp, t); | |
307 | } | |
308 | ||
309 | static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) | |
310 | { | |
311 | struct ip6_tnl __rcu **tp; | |
312 | struct ip6_tnl *iter; | |
313 | ||
314 | for (tp = ip6gre_bucket(ign, t); | |
315 | (iter = rtnl_dereference(*tp)) != NULL; | |
316 | tp = &iter->next) { | |
317 | if (t == iter) { | |
318 | rcu_assign_pointer(*tp, t->next); | |
319 | break; | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
324 | static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, | |
325 | const struct __ip6_tnl_parm *parms, | |
326 | int type) | |
327 | { | |
328 | const struct in6_addr *remote = &parms->raddr; | |
329 | const struct in6_addr *local = &parms->laddr; | |
330 | __be32 key = parms->i_key; | |
331 | int link = parms->link; | |
332 | struct ip6_tnl *t; | |
333 | struct ip6_tnl __rcu **tp; | |
334 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
335 | ||
336 | for (tp = __ip6gre_bucket(ign, parms); | |
337 | (t = rtnl_dereference(*tp)) != NULL; | |
338 | tp = &t->next) | |
339 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
340 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
341 | key == t->parms.i_key && | |
342 | link == t->parms.link && | |
343 | type == t->dev->type) | |
344 | break; | |
345 | ||
346 | return t; | |
347 | } | |
348 | ||
349 | static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, | |
350 | const struct __ip6_tnl_parm *parms, int create) | |
351 | { | |
352 | struct ip6_tnl *t, *nt; | |
353 | struct net_device *dev; | |
354 | char name[IFNAMSIZ]; | |
355 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
356 | ||
357 | t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); | |
358 | if (t || !create) | |
359 | return t; | |
360 | ||
361 | if (parms->name[0]) | |
362 | strlcpy(name, parms->name, IFNAMSIZ); | |
363 | else | |
364 | strcpy(name, "ip6gre%d"); | |
365 | ||
366 | dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup); | |
367 | if (!dev) | |
368 | return NULL; | |
369 | ||
370 | dev_net_set(dev, net); | |
371 | ||
372 | nt = netdev_priv(dev); | |
373 | nt->parms = *parms; | |
374 | dev->rtnl_link_ops = &ip6gre_link_ops; | |
375 | ||
376 | nt->dev = dev; | |
377 | ip6gre_tnl_link_config(nt, 1); | |
378 | ||
379 | if (register_netdevice(dev) < 0) | |
380 | goto failed_free; | |
381 | ||
382 | /* Can use a lockless transmit, unless we generate output sequences */ | |
383 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
384 | dev->features |= NETIF_F_LLTX; | |
385 | ||
386 | dev_hold(dev); | |
387 | ip6gre_tunnel_link(ign, nt); | |
388 | return nt; | |
389 | ||
390 | failed_free: | |
391 | free_netdev(dev); | |
392 | return NULL; | |
393 | } | |
394 | ||
395 | static void ip6gre_tunnel_uninit(struct net_device *dev) | |
396 | { | |
397 | struct net *net = dev_net(dev); | |
398 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
399 | ||
400 | ip6gre_tunnel_unlink(ign, netdev_priv(dev)); | |
401 | dev_put(dev); | |
402 | } | |
403 | ||
404 | ||
405 | static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
406 | u8 type, u8 code, int offset, __be32 info) | |
407 | { | |
408 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; | |
b87fb39e ED |
409 | __be16 *p = (__be16 *)(skb->data + offset); |
410 | int grehlen = offset + 4; | |
c12b395a | 411 | struct ip6_tnl *t; |
412 | __be16 flags; | |
413 | ||
414 | flags = p[0]; | |
415 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
416 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
417 | return; | |
418 | if (flags&GRE_KEY) { | |
419 | grehlen += 4; | |
420 | if (flags&GRE_CSUM) | |
421 | grehlen += 4; | |
422 | } | |
423 | } | |
424 | ||
425 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
b87fb39e | 426 | if (!pskb_may_pull(skb, grehlen)) |
c12b395a | 427 | return; |
b87fb39e ED |
428 | ipv6h = (const struct ipv6hdr *)skb->data; |
429 | p = (__be16 *)(skb->data + offset); | |
c12b395a | 430 | |
c12b395a | 431 | t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, |
432 | flags & GRE_KEY ? | |
433 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
434 | p[1]); | |
435 | if (t == NULL) | |
0c5794a6 | 436 | return; |
c12b395a | 437 | |
438 | switch (type) { | |
439 | __u32 teli; | |
440 | struct ipv6_tlv_tnl_enc_lim *tel; | |
441 | __u32 mtu; | |
442 | case ICMPV6_DEST_UNREACH: | |
443 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", | |
444 | t->parms.name); | |
445 | break; | |
446 | case ICMPV6_TIME_EXCEED: | |
447 | if (code == ICMPV6_EXC_HOPLIMIT) { | |
448 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", | |
449 | t->parms.name); | |
450 | } | |
451 | break; | |
452 | case ICMPV6_PARAMPROB: | |
453 | teli = 0; | |
454 | if (code == ICMPV6_HDR_FIELD) | |
455 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); | |
456 | ||
457 | if (teli && teli == info - 2) { | |
458 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; | |
459 | if (tel->encap_limit == 0) { | |
460 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", | |
461 | t->parms.name); | |
462 | } | |
463 | } else { | |
464 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
465 | t->parms.name); | |
466 | } | |
467 | break; | |
468 | case ICMPV6_PKT_TOOBIG: | |
469 | mtu = info - offset; | |
470 | if (mtu < IPV6_MIN_MTU) | |
471 | mtu = IPV6_MIN_MTU; | |
472 | t->dev->mtu = mtu; | |
473 | break; | |
474 | } | |
475 | ||
476 | if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) | |
477 | t->err_count++; | |
478 | else | |
479 | t->err_count = 1; | |
480 | t->err_time = jiffies; | |
c12b395a | 481 | } |
482 | ||
c12b395a | 483 | static int ip6gre_rcv(struct sk_buff *skb) |
484 | { | |
485 | const struct ipv6hdr *ipv6h; | |
486 | u8 *h; | |
487 | __be16 flags; | |
488 | __sum16 csum = 0; | |
489 | __be32 key = 0; | |
490 | u32 seqno = 0; | |
491 | struct ip6_tnl *tunnel; | |
492 | int offset = 4; | |
493 | __be16 gre_proto; | |
eccc1bb8 | 494 | int err; |
c12b395a | 495 | |
496 | if (!pskb_may_pull(skb, sizeof(struct in6_addr))) | |
0c5794a6 | 497 | goto drop; |
c12b395a | 498 | |
499 | ipv6h = ipv6_hdr(skb); | |
500 | h = skb->data; | |
501 | flags = *(__be16 *)h; | |
502 | ||
503 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
504 | /* - Version must be 0. | |
505 | - We do not support routing headers. | |
506 | */ | |
507 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
0c5794a6 | 508 | goto drop; |
c12b395a | 509 | |
510 | if (flags&GRE_CSUM) { | |
511 | switch (skb->ip_summed) { | |
512 | case CHECKSUM_COMPLETE: | |
513 | csum = csum_fold(skb->csum); | |
514 | if (!csum) | |
515 | break; | |
516 | /* fall through */ | |
517 | case CHECKSUM_NONE: | |
518 | skb->csum = 0; | |
519 | csum = __skb_checksum_complete(skb); | |
520 | skb->ip_summed = CHECKSUM_COMPLETE; | |
521 | } | |
522 | offset += 4; | |
523 | } | |
524 | if (flags&GRE_KEY) { | |
525 | key = *(__be32 *)(h + offset); | |
526 | offset += 4; | |
527 | } | |
528 | if (flags&GRE_SEQ) { | |
529 | seqno = ntohl(*(__be32 *)(h + offset)); | |
530 | offset += 4; | |
531 | } | |
532 | } | |
533 | ||
534 | gre_proto = *(__be16 *)(h + 2); | |
535 | ||
c12b395a | 536 | tunnel = ip6gre_tunnel_lookup(skb->dev, |
537 | &ipv6h->saddr, &ipv6h->daddr, key, | |
538 | gre_proto); | |
539 | if (tunnel) { | |
540 | struct pcpu_tstats *tstats; | |
541 | ||
542 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
543 | goto drop; | |
544 | ||
545 | if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) { | |
546 | tunnel->dev->stats.rx_dropped++; | |
547 | goto drop; | |
548 | } | |
549 | ||
550 | secpath_reset(skb); | |
551 | ||
552 | skb->protocol = gre_proto; | |
553 | /* WCCP version 1 and 2 protocol decoding. | |
554 | * - Change protocol to IP | |
555 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
556 | */ | |
557 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { | |
558 | skb->protocol = htons(ETH_P_IP); | |
559 | if ((*(h + offset) & 0xF0) != 0x40) | |
560 | offset += 4; | |
561 | } | |
562 | ||
563 | skb->mac_header = skb->network_header; | |
564 | __pskb_pull(skb, offset); | |
565 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); | |
566 | skb->pkt_type = PACKET_HOST; | |
567 | ||
568 | if (((flags&GRE_CSUM) && csum) || | |
569 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
570 | tunnel->dev->stats.rx_crc_errors++; | |
571 | tunnel->dev->stats.rx_errors++; | |
572 | goto drop; | |
573 | } | |
574 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
575 | if (!(flags&GRE_SEQ) || | |
576 | (tunnel->i_seqno && | |
577 | (s32)(seqno - tunnel->i_seqno) < 0)) { | |
578 | tunnel->dev->stats.rx_fifo_errors++; | |
579 | tunnel->dev->stats.rx_errors++; | |
580 | goto drop; | |
581 | } | |
582 | tunnel->i_seqno = seqno + 1; | |
583 | } | |
584 | ||
585 | /* Warning: All skb pointers will be invalidated! */ | |
586 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
587 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
588 | tunnel->dev->stats.rx_length_errors++; | |
589 | tunnel->dev->stats.rx_errors++; | |
590 | goto drop; | |
591 | } | |
592 | ||
593 | ipv6h = ipv6_hdr(skb); | |
594 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
595 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
596 | } | |
597 | ||
eccc1bb8 | 598 | __skb_tunnel_rx(skb, tunnel->dev); |
599 | ||
600 | skb_reset_network_header(skb); | |
601 | ||
602 | err = IP6_ECN_decapsulate(ipv6h, skb); | |
603 | if (unlikely(err)) { | |
604 | if (log_ecn_error) | |
605 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
606 | &ipv6h->saddr, | |
607 | ipv6_get_dsfield(ipv6h)); | |
608 | if (err > 1) { | |
609 | ++tunnel->dev->stats.rx_frame_errors; | |
610 | ++tunnel->dev->stats.rx_errors; | |
611 | goto drop; | |
612 | } | |
613 | } | |
614 | ||
c12b395a | 615 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
616 | u64_stats_update_begin(&tstats->syncp); | |
617 | tstats->rx_packets++; | |
618 | tstats->rx_bytes += skb->len; | |
619 | u64_stats_update_end(&tstats->syncp); | |
620 | ||
c12b395a | 621 | netif_rx(skb); |
622 | ||
c12b395a | 623 | return 0; |
624 | } | |
625 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
626 | ||
627 | drop: | |
c12b395a | 628 | kfree_skb(skb); |
629 | return 0; | |
630 | } | |
631 | ||
632 | struct ipv6_tel_txoption { | |
633 | struct ipv6_txoptions ops; | |
634 | __u8 dst_opt[8]; | |
635 | }; | |
636 | ||
637 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) | |
638 | { | |
639 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
640 | ||
641 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; | |
642 | opt->dst_opt[3] = 1; | |
643 | opt->dst_opt[4] = encap_limit; | |
644 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
645 | opt->dst_opt[6] = 1; | |
646 | ||
647 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; | |
648 | opt->ops.opt_nflen = 8; | |
649 | } | |
650 | ||
651 | static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, | |
652 | struct net_device *dev, | |
653 | __u8 dsfield, | |
654 | struct flowi6 *fl6, | |
655 | int encap_limit, | |
656 | __u32 *pmtu) | |
657 | { | |
658 | struct net *net = dev_net(dev); | |
659 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
660 | struct net_device *tdev; /* Device to other host */ | |
661 | struct ipv6hdr *ipv6h; /* Our new IP header */ | |
662 | unsigned int max_headroom; /* The extra header space needed */ | |
663 | int gre_hlen; | |
664 | struct ipv6_tel_txoption opt; | |
665 | int mtu; | |
666 | struct dst_entry *dst = NULL, *ndst = NULL; | |
667 | struct net_device_stats *stats = &tunnel->dev->stats; | |
668 | int err = -1; | |
669 | u8 proto; | |
670 | int pkt_len; | |
671 | struct sk_buff *new_skb; | |
672 | ||
673 | if (dev->type == ARPHRD_ETHER) | |
674 | IPCB(skb)->flags = 0; | |
675 | ||
676 | if (dev->header_ops && dev->type == ARPHRD_IP6GRE) { | |
677 | gre_hlen = 0; | |
678 | ipv6h = (struct ipv6hdr *)skb->data; | |
679 | fl6->daddr = ipv6h->daddr; | |
680 | } else { | |
681 | gre_hlen = tunnel->hlen; | |
682 | fl6->daddr = tunnel->parms.raddr; | |
683 | } | |
684 | ||
685 | if (!fl6->flowi6_mark) | |
686 | dst = ip6_tnl_dst_check(tunnel); | |
687 | ||
688 | if (!dst) { | |
689 | ndst = ip6_route_output(net, NULL, fl6); | |
690 | ||
691 | if (ndst->error) | |
692 | goto tx_err_link_failure; | |
693 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); | |
694 | if (IS_ERR(ndst)) { | |
695 | err = PTR_ERR(ndst); | |
696 | ndst = NULL; | |
697 | goto tx_err_link_failure; | |
698 | } | |
699 | dst = ndst; | |
700 | } | |
701 | ||
702 | tdev = dst->dev; | |
703 | ||
704 | if (tdev == dev) { | |
705 | stats->collisions++; | |
706 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
707 | tunnel->parms.name); | |
708 | goto tx_err_dst_release; | |
709 | } | |
710 | ||
711 | mtu = dst_mtu(dst) - sizeof(*ipv6h); | |
712 | if (encap_limit >= 0) { | |
713 | max_headroom += 8; | |
714 | mtu -= 8; | |
715 | } | |
716 | if (mtu < IPV6_MIN_MTU) | |
717 | mtu = IPV6_MIN_MTU; | |
718 | if (skb_dst(skb)) | |
719 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
720 | if (skb->len > mtu) { | |
721 | *pmtu = mtu; | |
722 | err = -EMSGSIZE; | |
723 | goto tx_err_dst_release; | |
724 | } | |
725 | ||
726 | if (tunnel->err_count > 0) { | |
727 | if (time_before(jiffies, | |
728 | tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
729 | tunnel->err_count--; | |
730 | ||
731 | dst_link_failure(skb); | |
732 | } else | |
733 | tunnel->err_count = 0; | |
734 | } | |
735 | ||
736 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; | |
737 | ||
738 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
739 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
740 | new_skb = skb_realloc_headroom(skb, max_headroom); | |
741 | if (max_headroom > dev->needed_headroom) | |
742 | dev->needed_headroom = max_headroom; | |
743 | if (!new_skb) | |
744 | goto tx_err_dst_release; | |
745 | ||
746 | if (skb->sk) | |
747 | skb_set_owner_w(new_skb, skb->sk); | |
748 | consume_skb(skb); | |
749 | skb = new_skb; | |
750 | } | |
751 | ||
752 | skb_dst_drop(skb); | |
753 | ||
754 | if (fl6->flowi6_mark) { | |
755 | skb_dst_set(skb, dst); | |
756 | ndst = NULL; | |
757 | } else { | |
758 | skb_dst_set_noref(skb, dst); | |
759 | } | |
760 | ||
761 | skb->transport_header = skb->network_header; | |
762 | ||
763 | proto = NEXTHDR_GRE; | |
764 | if (encap_limit >= 0) { | |
765 | init_tel_txopt(&opt, encap_limit); | |
766 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
767 | } | |
768 | ||
769 | skb_push(skb, gre_hlen); | |
770 | skb_reset_network_header(skb); | |
771 | ||
772 | /* | |
773 | * Push down and install the IP header. | |
774 | */ | |
775 | ipv6h = ipv6_hdr(skb); | |
776 | *(__be32 *)ipv6h = fl6->flowlabel | htonl(0x60000000); | |
777 | dsfield = INET_ECN_encapsulate(0, dsfield); | |
778 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
779 | ipv6h->hop_limit = tunnel->parms.hop_limit; | |
780 | ipv6h->nexthdr = proto; | |
781 | ipv6h->saddr = fl6->saddr; | |
782 | ipv6h->daddr = fl6->daddr; | |
783 | ||
784 | ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags; | |
785 | ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
786 | htons(ETH_P_TEB) : skb->protocol; | |
787 | ||
788 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
789 | __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4); | |
790 | ||
791 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
792 | ++tunnel->o_seqno; | |
793 | *ptr = htonl(tunnel->o_seqno); | |
794 | ptr--; | |
795 | } | |
796 | if (tunnel->parms.o_flags&GRE_KEY) { | |
797 | *ptr = tunnel->parms.o_key; | |
798 | ptr--; | |
799 | } | |
800 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
801 | *ptr = 0; | |
802 | *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1), | |
803 | skb->len - sizeof(struct ipv6hdr)); | |
804 | } | |
805 | } | |
806 | ||
807 | nf_reset(skb); | |
808 | pkt_len = skb->len; | |
809 | err = ip6_local_out(skb); | |
810 | ||
811 | if (net_xmit_eval(err) == 0) { | |
812 | struct pcpu_tstats *tstats = this_cpu_ptr(tunnel->dev->tstats); | |
813 | ||
814 | tstats->tx_bytes += pkt_len; | |
815 | tstats->tx_packets++; | |
816 | } else { | |
817 | stats->tx_errors++; | |
818 | stats->tx_aborted_errors++; | |
819 | } | |
820 | ||
821 | if (ndst) | |
822 | ip6_tnl_dst_store(tunnel, ndst); | |
823 | ||
824 | return 0; | |
825 | tx_err_link_failure: | |
826 | stats->tx_carrier_errors++; | |
827 | dst_link_failure(skb); | |
828 | tx_err_dst_release: | |
829 | dst_release(ndst); | |
830 | return err; | |
831 | } | |
832 | ||
833 | static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) | |
834 | { | |
835 | struct ip6_tnl *t = netdev_priv(dev); | |
836 | const struct iphdr *iph = ip_hdr(skb); | |
837 | int encap_limit = -1; | |
838 | struct flowi6 fl6; | |
839 | __u8 dsfield; | |
840 | __u32 mtu; | |
841 | int err; | |
842 | ||
843 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
844 | encap_limit = t->parms.encap_limit; | |
845 | ||
846 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
847 | fl6.flowi6_proto = IPPROTO_IPIP; | |
848 | ||
849 | dsfield = ipv4_get_dsfield(iph); | |
850 | ||
851 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
852 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) | |
853 | & IPV6_TCLASS_MASK; | |
854 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
855 | fl6.flowi6_mark = skb->mark; | |
856 | ||
857 | err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); | |
858 | if (err != 0) { | |
859 | /* XXX: send ICMP error even if DF is not set. */ | |
860 | if (err == -EMSGSIZE) | |
861 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
862 | htonl(mtu)); | |
863 | return -1; | |
864 | } | |
865 | ||
866 | return 0; | |
867 | } | |
868 | ||
869 | static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) | |
870 | { | |
871 | struct ip6_tnl *t = netdev_priv(dev); | |
872 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
873 | int encap_limit = -1; | |
874 | __u16 offset; | |
875 | struct flowi6 fl6; | |
876 | __u8 dsfield; | |
877 | __u32 mtu; | |
878 | int err; | |
879 | ||
880 | if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) | |
881 | return -1; | |
882 | ||
883 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); | |
884 | if (offset > 0) { | |
885 | struct ipv6_tlv_tnl_enc_lim *tel; | |
886 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; | |
887 | if (tel->encap_limit == 0) { | |
888 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
889 | ICMPV6_HDR_FIELD, offset + 2); | |
890 | return -1; | |
891 | } | |
892 | encap_limit = tel->encap_limit - 1; | |
893 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
894 | encap_limit = t->parms.encap_limit; | |
895 | ||
896 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
897 | fl6.flowi6_proto = IPPROTO_IPV6; | |
898 | ||
899 | dsfield = ipv6_get_dsfield(ipv6h); | |
900 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
901 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
902 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) | |
903 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
904 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
905 | fl6.flowi6_mark = skb->mark; | |
906 | ||
907 | err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); | |
908 | if (err != 0) { | |
909 | if (err == -EMSGSIZE) | |
910 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
911 | return -1; | |
912 | } | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | /** | |
918 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
919 | * @t: the outgoing tunnel device | |
920 | * @hdr: IPv6 header from the incoming packet | |
921 | * | |
922 | * Description: | |
923 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
924 | * doesn't match source of incoming packet. | |
925 | * | |
926 | * Return: | |
927 | * 1 if conflict, | |
928 | * 0 else | |
929 | **/ | |
930 | ||
931 | static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, | |
932 | const struct ipv6hdr *hdr) | |
933 | { | |
934 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
935 | } | |
936 | ||
937 | static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) | |
938 | { | |
939 | struct ip6_tnl *t = netdev_priv(dev); | |
940 | int encap_limit = -1; | |
941 | struct flowi6 fl6; | |
942 | __u32 mtu; | |
943 | int err; | |
944 | ||
945 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
946 | encap_limit = t->parms.encap_limit; | |
947 | ||
948 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
949 | fl6.flowi6_proto = skb->protocol; | |
950 | ||
951 | err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu); | |
952 | ||
953 | return err; | |
954 | } | |
955 | ||
956 | static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, | |
957 | struct net_device *dev) | |
958 | { | |
959 | struct ip6_tnl *t = netdev_priv(dev); | |
960 | struct net_device_stats *stats = &t->dev->stats; | |
961 | int ret; | |
962 | ||
963 | if (!ip6_tnl_xmit_ctl(t)) | |
964 | return -1; | |
965 | ||
966 | switch (skb->protocol) { | |
967 | case htons(ETH_P_IP): | |
968 | ret = ip6gre_xmit_ipv4(skb, dev); | |
969 | break; | |
970 | case htons(ETH_P_IPV6): | |
971 | ret = ip6gre_xmit_ipv6(skb, dev); | |
972 | break; | |
973 | default: | |
974 | ret = ip6gre_xmit_other(skb, dev); | |
975 | break; | |
976 | } | |
977 | ||
978 | if (ret < 0) | |
979 | goto tx_err; | |
980 | ||
981 | return NETDEV_TX_OK; | |
982 | ||
983 | tx_err: | |
984 | stats->tx_errors++; | |
985 | stats->tx_dropped++; | |
986 | kfree_skb(skb); | |
987 | return NETDEV_TX_OK; | |
988 | } | |
989 | ||
990 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) | |
991 | { | |
992 | struct net_device *dev = t->dev; | |
993 | struct __ip6_tnl_parm *p = &t->parms; | |
994 | struct flowi6 *fl6 = &t->fl.u.ip6; | |
995 | int addend = sizeof(struct ipv6hdr) + 4; | |
996 | ||
997 | if (dev->type != ARPHRD_ETHER) { | |
998 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
999 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1000 | } | |
1001 | ||
1002 | /* Set up flowi template */ | |
1003 | fl6->saddr = p->laddr; | |
1004 | fl6->daddr = p->raddr; | |
1005 | fl6->flowi6_oif = p->link; | |
1006 | fl6->flowlabel = 0; | |
1007 | ||
1008 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1009 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1010 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1011 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1012 | ||
1013 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); | |
1014 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1015 | ||
1016 | if (p->flags&IP6_TNL_F_CAP_XMIT && | |
1017 | p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) | |
1018 | dev->flags |= IFF_POINTOPOINT; | |
1019 | else | |
1020 | dev->flags &= ~IFF_POINTOPOINT; | |
1021 | ||
1022 | dev->iflink = p->link; | |
1023 | ||
1024 | /* Precalculate GRE options length */ | |
1025 | if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
1026 | if (t->parms.o_flags&GRE_CSUM) | |
1027 | addend += 4; | |
1028 | if (t->parms.o_flags&GRE_KEY) | |
1029 | addend += 4; | |
1030 | if (t->parms.o_flags&GRE_SEQ) | |
1031 | addend += 4; | |
1032 | } | |
1033 | ||
1034 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
1035 | int strict = (ipv6_addr_type(&p->raddr) & | |
1036 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1037 | ||
1038 | struct rt6_info *rt = rt6_lookup(dev_net(dev), | |
1039 | &p->raddr, &p->laddr, | |
1040 | p->link, strict); | |
1041 | ||
1042 | if (rt == NULL) | |
1043 | return; | |
1044 | ||
1045 | if (rt->dst.dev) { | |
1046 | dev->hard_header_len = rt->dst.dev->hard_header_len + addend; | |
1047 | ||
1048 | if (set_mtu) { | |
1049 | dev->mtu = rt->dst.dev->mtu - addend; | |
1050 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1051 | dev->mtu -= 8; | |
1052 | ||
1053 | if (dev->mtu < IPV6_MIN_MTU) | |
1054 | dev->mtu = IPV6_MIN_MTU; | |
1055 | } | |
1056 | } | |
94e187c0 | 1057 | ip6_rt_put(rt); |
c12b395a | 1058 | } |
1059 | ||
1060 | t->hlen = addend; | |
1061 | } | |
1062 | ||
1063 | static int ip6gre_tnl_change(struct ip6_tnl *t, | |
1064 | const struct __ip6_tnl_parm *p, int set_mtu) | |
1065 | { | |
1066 | t->parms.laddr = p->laddr; | |
1067 | t->parms.raddr = p->raddr; | |
1068 | t->parms.flags = p->flags; | |
1069 | t->parms.hop_limit = p->hop_limit; | |
1070 | t->parms.encap_limit = p->encap_limit; | |
1071 | t->parms.flowinfo = p->flowinfo; | |
1072 | t->parms.link = p->link; | |
1073 | t->parms.proto = p->proto; | |
1074 | t->parms.i_key = p->i_key; | |
1075 | t->parms.o_key = p->o_key; | |
1076 | t->parms.i_flags = p->i_flags; | |
1077 | t->parms.o_flags = p->o_flags; | |
1078 | ip6_tnl_dst_reset(t); | |
1079 | ip6gre_tnl_link_config(t, set_mtu); | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, | |
1084 | const struct ip6_tnl_parm2 *u) | |
1085 | { | |
1086 | p->laddr = u->laddr; | |
1087 | p->raddr = u->raddr; | |
1088 | p->flags = u->flags; | |
1089 | p->hop_limit = u->hop_limit; | |
1090 | p->encap_limit = u->encap_limit; | |
1091 | p->flowinfo = u->flowinfo; | |
1092 | p->link = u->link; | |
1093 | p->i_key = u->i_key; | |
1094 | p->o_key = u->o_key; | |
1095 | p->i_flags = u->i_flags; | |
1096 | p->o_flags = u->o_flags; | |
1097 | memcpy(p->name, u->name, sizeof(u->name)); | |
1098 | } | |
1099 | ||
1100 | static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, | |
1101 | const struct __ip6_tnl_parm *p) | |
1102 | { | |
1103 | u->proto = IPPROTO_GRE; | |
1104 | u->laddr = p->laddr; | |
1105 | u->raddr = p->raddr; | |
1106 | u->flags = p->flags; | |
1107 | u->hop_limit = p->hop_limit; | |
1108 | u->encap_limit = p->encap_limit; | |
1109 | u->flowinfo = p->flowinfo; | |
1110 | u->link = p->link; | |
1111 | u->i_key = p->i_key; | |
1112 | u->o_key = p->o_key; | |
1113 | u->i_flags = p->i_flags; | |
1114 | u->o_flags = p->o_flags; | |
1115 | memcpy(u->name, p->name, sizeof(u->name)); | |
1116 | } | |
1117 | ||
1118 | static int ip6gre_tunnel_ioctl(struct net_device *dev, | |
1119 | struct ifreq *ifr, int cmd) | |
1120 | { | |
1121 | int err = 0; | |
1122 | struct ip6_tnl_parm2 p; | |
1123 | struct __ip6_tnl_parm p1; | |
1124 | struct ip6_tnl *t; | |
1125 | struct net *net = dev_net(dev); | |
1126 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1127 | ||
1128 | switch (cmd) { | |
1129 | case SIOCGETTUNNEL: | |
1130 | t = NULL; | |
1131 | if (dev == ign->fb_tunnel_dev) { | |
1132 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
1133 | err = -EFAULT; | |
1134 | break; | |
1135 | } | |
1136 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1137 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
1138 | } | |
1139 | if (t == NULL) | |
1140 | t = netdev_priv(dev); | |
1141 | ip6gre_tnl_parm_to_user(&p, &t->parms); | |
1142 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1143 | err = -EFAULT; | |
1144 | break; | |
1145 | ||
1146 | case SIOCADDTUNNEL: | |
1147 | case SIOCCHGTUNNEL: | |
1148 | err = -EPERM; | |
1149 | if (!capable(CAP_NET_ADMIN)) | |
1150 | goto done; | |
1151 | ||
1152 | err = -EFAULT; | |
1153 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1154 | goto done; | |
1155 | ||
1156 | err = -EINVAL; | |
1157 | if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) | |
1158 | goto done; | |
1159 | ||
1160 | if (!(p.i_flags&GRE_KEY)) | |
1161 | p.i_key = 0; | |
1162 | if (!(p.o_flags&GRE_KEY)) | |
1163 | p.o_key = 0; | |
1164 | ||
1165 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1166 | t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
1167 | ||
1168 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
1169 | if (t != NULL) { | |
1170 | if (t->dev != dev) { | |
1171 | err = -EEXIST; | |
1172 | break; | |
1173 | } | |
1174 | } else { | |
1175 | t = netdev_priv(dev); | |
1176 | ||
1177 | ip6gre_tunnel_unlink(ign, t); | |
1178 | synchronize_net(); | |
1179 | ip6gre_tnl_change(t, &p1, 1); | |
1180 | ip6gre_tunnel_link(ign, t); | |
1181 | netdev_state_change(dev); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | if (t) { | |
1186 | err = 0; | |
1187 | ||
1188 | ip6gre_tnl_parm_to_user(&p, &t->parms); | |
1189 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1190 | err = -EFAULT; | |
1191 | } else | |
1192 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1193 | break; | |
1194 | ||
1195 | case SIOCDELTUNNEL: | |
1196 | err = -EPERM; | |
1197 | if (!capable(CAP_NET_ADMIN)) | |
1198 | goto done; | |
1199 | ||
1200 | if (dev == ign->fb_tunnel_dev) { | |
1201 | err = -EFAULT; | |
1202 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1203 | goto done; | |
1204 | err = -ENOENT; | |
1205 | ip6gre_tnl_parm_from_user(&p1, &p); | |
1206 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
1207 | if (t == NULL) | |
1208 | goto done; | |
1209 | err = -EPERM; | |
1210 | if (t == netdev_priv(ign->fb_tunnel_dev)) | |
1211 | goto done; | |
1212 | dev = t->dev; | |
1213 | } | |
1214 | unregister_netdevice(dev); | |
1215 | err = 0; | |
1216 | break; | |
1217 | ||
1218 | default: | |
1219 | err = -EINVAL; | |
1220 | } | |
1221 | ||
1222 | done: | |
1223 | return err; | |
1224 | } | |
1225 | ||
1226 | static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1227 | { | |
1228 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1229 | if (new_mtu < 68 || | |
1230 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1231 | return -EINVAL; | |
1232 | dev->mtu = new_mtu; | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, | |
1237 | unsigned short type, | |
1238 | const void *daddr, const void *saddr, unsigned int len) | |
1239 | { | |
1240 | struct ip6_tnl *t = netdev_priv(dev); | |
1241 | struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); | |
1242 | __be16 *p = (__be16 *)(ipv6h+1); | |
1243 | ||
1244 | *(__be32 *)ipv6h = t->fl.u.ip6.flowlabel | htonl(0x60000000); | |
1245 | ipv6h->hop_limit = t->parms.hop_limit; | |
1246 | ipv6h->nexthdr = NEXTHDR_GRE; | |
1247 | ipv6h->saddr = t->parms.laddr; | |
1248 | ipv6h->daddr = t->parms.raddr; | |
1249 | ||
1250 | p[0] = t->parms.o_flags; | |
1251 | p[1] = htons(type); | |
1252 | ||
1253 | /* | |
1254 | * Set the source hardware address. | |
1255 | */ | |
1256 | ||
1257 | if (saddr) | |
1258 | memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); | |
1259 | if (daddr) | |
1260 | memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); | |
1261 | if (!ipv6_addr_any(&ipv6h->daddr)) | |
1262 | return t->hlen; | |
1263 | ||
1264 | return -t->hlen; | |
1265 | } | |
1266 | ||
c12b395a | 1267 | static const struct header_ops ip6gre_header_ops = { |
1268 | .create = ip6gre_header, | |
c12b395a | 1269 | }; |
1270 | ||
1271 | static const struct net_device_ops ip6gre_netdev_ops = { | |
1272 | .ndo_init = ip6gre_tunnel_init, | |
1273 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1274 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1275 | .ndo_do_ioctl = ip6gre_tunnel_ioctl, | |
1276 | .ndo_change_mtu = ip6gre_tunnel_change_mtu, | |
1277 | .ndo_get_stats64 = ip6gre_get_stats64, | |
1278 | }; | |
1279 | ||
1280 | static void ip6gre_dev_free(struct net_device *dev) | |
1281 | { | |
1282 | free_percpu(dev->tstats); | |
1283 | free_netdev(dev); | |
1284 | } | |
1285 | ||
1286 | static void ip6gre_tunnel_setup(struct net_device *dev) | |
1287 | { | |
1288 | struct ip6_tnl *t; | |
1289 | ||
1290 | dev->netdev_ops = &ip6gre_netdev_ops; | |
1291 | dev->destructor = ip6gre_dev_free; | |
1292 | ||
1293 | dev->type = ARPHRD_IP6GRE; | |
1294 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4; | |
1295 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4; | |
1296 | t = netdev_priv(dev); | |
1297 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1298 | dev->mtu -= 8; | |
1299 | dev->flags |= IFF_NOARP; | |
1300 | dev->iflink = 0; | |
1301 | dev->addr_len = sizeof(struct in6_addr); | |
1302 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1303 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
1304 | } | |
1305 | ||
1306 | static int ip6gre_tunnel_init(struct net_device *dev) | |
1307 | { | |
1308 | struct ip6_tnl *tunnel; | |
1309 | ||
1310 | tunnel = netdev_priv(dev); | |
1311 | ||
1312 | tunnel->dev = dev; | |
1313 | strcpy(tunnel->parms.name, dev->name); | |
1314 | ||
1315 | memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); | |
1316 | memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); | |
1317 | ||
1318 | if (ipv6_addr_any(&tunnel->parms.raddr)) | |
1319 | dev->header_ops = &ip6gre_header_ops; | |
1320 | ||
1321 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1322 | if (!dev->tstats) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | static void ip6gre_fb_tunnel_init(struct net_device *dev) | |
1329 | { | |
1330 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1331 | ||
1332 | tunnel->dev = dev; | |
1333 | strcpy(tunnel->parms.name, dev->name); | |
1334 | ||
1335 | tunnel->hlen = sizeof(struct ipv6hdr) + 4; | |
1336 | ||
1337 | dev_hold(dev); | |
1338 | } | |
1339 | ||
1340 | ||
1341 | static struct inet6_protocol ip6gre_protocol __read_mostly = { | |
1342 | .handler = ip6gre_rcv, | |
1343 | .err_handler = ip6gre_err, | |
1344 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1345 | }; | |
1346 | ||
1347 | static void ip6gre_destroy_tunnels(struct ip6gre_net *ign, | |
1348 | struct list_head *head) | |
1349 | { | |
1350 | int prio; | |
1351 | ||
1352 | for (prio = 0; prio < 4; prio++) { | |
1353 | int h; | |
1354 | for (h = 0; h < HASH_SIZE; h++) { | |
1355 | struct ip6_tnl *t; | |
1356 | ||
1357 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
1358 | ||
1359 | while (t != NULL) { | |
1360 | unregister_netdevice_queue(t->dev, head); | |
1361 | t = rtnl_dereference(t->next); | |
1362 | } | |
1363 | } | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | static int __net_init ip6gre_init_net(struct net *net) | |
1368 | { | |
1369 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1370 | int err; | |
1371 | ||
1372 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", | |
1373 | ip6gre_tunnel_setup); | |
1374 | if (!ign->fb_tunnel_dev) { | |
1375 | err = -ENOMEM; | |
1376 | goto err_alloc_dev; | |
1377 | } | |
1378 | dev_net_set(ign->fb_tunnel_dev, net); | |
1379 | ||
1380 | ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); | |
1381 | ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; | |
1382 | ||
1383 | err = register_netdev(ign->fb_tunnel_dev); | |
1384 | if (err) | |
1385 | goto err_reg_dev; | |
1386 | ||
1387 | rcu_assign_pointer(ign->tunnels_wc[0], | |
1388 | netdev_priv(ign->fb_tunnel_dev)); | |
1389 | return 0; | |
1390 | ||
1391 | err_reg_dev: | |
1392 | ip6gre_dev_free(ign->fb_tunnel_dev); | |
1393 | err_alloc_dev: | |
1394 | return err; | |
1395 | } | |
1396 | ||
1397 | static void __net_exit ip6gre_exit_net(struct net *net) | |
1398 | { | |
1399 | struct ip6gre_net *ign; | |
1400 | LIST_HEAD(list); | |
1401 | ||
1402 | ign = net_generic(net, ip6gre_net_id); | |
1403 | rtnl_lock(); | |
1404 | ip6gre_destroy_tunnels(ign, &list); | |
1405 | unregister_netdevice_many(&list); | |
1406 | rtnl_unlock(); | |
1407 | } | |
1408 | ||
1409 | static struct pernet_operations ip6gre_net_ops = { | |
1410 | .init = ip6gre_init_net, | |
1411 | .exit = ip6gre_exit_net, | |
1412 | .id = &ip6gre_net_id, | |
1413 | .size = sizeof(struct ip6gre_net), | |
1414 | }; | |
1415 | ||
1416 | static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1417 | { | |
1418 | __be16 flags; | |
1419 | ||
1420 | if (!data) | |
1421 | return 0; | |
1422 | ||
1423 | flags = 0; | |
1424 | if (data[IFLA_GRE_IFLAGS]) | |
1425 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1426 | if (data[IFLA_GRE_OFLAGS]) | |
1427 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1428 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1429 | return -EINVAL; | |
1430 | ||
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1435 | { | |
1436 | struct in6_addr daddr; | |
1437 | ||
1438 | if (tb[IFLA_ADDRESS]) { | |
1439 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1440 | return -EINVAL; | |
1441 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1442 | return -EADDRNOTAVAIL; | |
1443 | } | |
1444 | ||
1445 | if (!data) | |
1446 | goto out; | |
1447 | ||
1448 | if (data[IFLA_GRE_REMOTE]) { | |
1449 | nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); | |
1450 | if (ipv6_addr_any(&daddr)) | |
1451 | return -EINVAL; | |
1452 | } | |
1453 | ||
1454 | out: | |
1455 | return ip6gre_tunnel_validate(tb, data); | |
1456 | } | |
1457 | ||
1458 | ||
1459 | static void ip6gre_netlink_parms(struct nlattr *data[], | |
1460 | struct __ip6_tnl_parm *parms) | |
1461 | { | |
1462 | memset(parms, 0, sizeof(*parms)); | |
1463 | ||
1464 | if (!data) | |
1465 | return; | |
1466 | ||
1467 | if (data[IFLA_GRE_LINK]) | |
1468 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1469 | ||
1470 | if (data[IFLA_GRE_IFLAGS]) | |
1471 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1472 | ||
1473 | if (data[IFLA_GRE_OFLAGS]) | |
1474 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1475 | ||
1476 | if (data[IFLA_GRE_IKEY]) | |
1477 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1478 | ||
1479 | if (data[IFLA_GRE_OKEY]) | |
1480 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1481 | ||
1482 | if (data[IFLA_GRE_LOCAL]) | |
1483 | nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr)); | |
1484 | ||
1485 | if (data[IFLA_GRE_REMOTE]) | |
1486 | nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); | |
1487 | ||
1488 | if (data[IFLA_GRE_TTL]) | |
1489 | parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); | |
1490 | ||
1491 | if (data[IFLA_GRE_ENCAP_LIMIT]) | |
1492 | parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); | |
1493 | ||
1494 | if (data[IFLA_GRE_FLOWINFO]) | |
1495 | parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]); | |
1496 | ||
1497 | if (data[IFLA_GRE_FLAGS]) | |
1498 | parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); | |
1499 | } | |
1500 | ||
1501 | static int ip6gre_tap_init(struct net_device *dev) | |
1502 | { | |
1503 | struct ip6_tnl *tunnel; | |
1504 | ||
1505 | tunnel = netdev_priv(dev); | |
1506 | ||
1507 | tunnel->dev = dev; | |
1508 | strcpy(tunnel->parms.name, dev->name); | |
1509 | ||
1510 | ip6gre_tnl_link_config(tunnel, 1); | |
1511 | ||
1512 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1513 | if (!dev->tstats) | |
1514 | return -ENOMEM; | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static const struct net_device_ops ip6gre_tap_netdev_ops = { | |
1520 | .ndo_init = ip6gre_tap_init, | |
1521 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1522 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1523 | .ndo_set_mac_address = eth_mac_addr, | |
1524 | .ndo_validate_addr = eth_validate_addr, | |
1525 | .ndo_change_mtu = ip6gre_tunnel_change_mtu, | |
1526 | .ndo_get_stats64 = ip6gre_get_stats64, | |
1527 | }; | |
1528 | ||
1529 | static void ip6gre_tap_setup(struct net_device *dev) | |
1530 | { | |
1531 | ||
1532 | ether_setup(dev); | |
1533 | ||
1534 | dev->netdev_ops = &ip6gre_tap_netdev_ops; | |
1535 | dev->destructor = ip6gre_dev_free; | |
1536 | ||
1537 | dev->iflink = 0; | |
1538 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1539 | } | |
1540 | ||
1541 | static int ip6gre_newlink(struct net *src_net, struct net_device *dev, | |
1542 | struct nlattr *tb[], struct nlattr *data[]) | |
1543 | { | |
1544 | struct ip6_tnl *nt; | |
1545 | struct net *net = dev_net(dev); | |
1546 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1547 | int err; | |
1548 | ||
1549 | nt = netdev_priv(dev); | |
1550 | ip6gre_netlink_parms(data, &nt->parms); | |
1551 | ||
1552 | if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) | |
1553 | return -EEXIST; | |
1554 | ||
1555 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1556 | eth_hw_addr_random(dev); | |
1557 | ||
1558 | nt->dev = dev; | |
1559 | ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); | |
1560 | ||
1561 | /* Can use a lockless transmit, unless we generate output sequences */ | |
1562 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1563 | dev->features |= NETIF_F_LLTX; | |
1564 | ||
1565 | err = register_netdevice(dev); | |
1566 | if (err) | |
1567 | goto out; | |
1568 | ||
1569 | dev_hold(dev); | |
1570 | ip6gre_tunnel_link(ign, nt); | |
1571 | ||
1572 | out: | |
1573 | return err; | |
1574 | } | |
1575 | ||
1576 | static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1577 | struct nlattr *data[]) | |
1578 | { | |
1579 | struct ip6_tnl *t, *nt; | |
1580 | struct net *net = dev_net(dev); | |
1581 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1582 | struct __ip6_tnl_parm p; | |
1583 | ||
1584 | if (dev == ign->fb_tunnel_dev) | |
1585 | return -EINVAL; | |
1586 | ||
1587 | nt = netdev_priv(dev); | |
1588 | ip6gre_netlink_parms(data, &p); | |
1589 | ||
1590 | t = ip6gre_tunnel_locate(net, &p, 0); | |
1591 | ||
1592 | if (t) { | |
1593 | if (t->dev != dev) | |
1594 | return -EEXIST; | |
1595 | } else { | |
1596 | t = nt; | |
1597 | ||
1598 | ip6gre_tunnel_unlink(ign, t); | |
1599 | ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); | |
1600 | ip6gre_tunnel_link(ign, t); | |
1601 | netdev_state_change(dev); | |
1602 | } | |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | static size_t ip6gre_get_size(const struct net_device *dev) | |
1608 | { | |
1609 | return | |
1610 | /* IFLA_GRE_LINK */ | |
1611 | nla_total_size(4) + | |
1612 | /* IFLA_GRE_IFLAGS */ | |
1613 | nla_total_size(2) + | |
1614 | /* IFLA_GRE_OFLAGS */ | |
1615 | nla_total_size(2) + | |
1616 | /* IFLA_GRE_IKEY */ | |
1617 | nla_total_size(4) + | |
1618 | /* IFLA_GRE_OKEY */ | |
1619 | nla_total_size(4) + | |
1620 | /* IFLA_GRE_LOCAL */ | |
a3754133 | 1621 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1622 | /* IFLA_GRE_REMOTE */ |
a3754133 | 1623 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1624 | /* IFLA_GRE_TTL */ |
1625 | nla_total_size(1) + | |
1626 | /* IFLA_GRE_TOS */ | |
1627 | nla_total_size(1) + | |
1628 | /* IFLA_GRE_ENCAP_LIMIT */ | |
1629 | nla_total_size(1) + | |
1630 | /* IFLA_GRE_FLOWINFO */ | |
1631 | nla_total_size(4) + | |
1632 | /* IFLA_GRE_FLAGS */ | |
1633 | nla_total_size(4) + | |
1634 | 0; | |
1635 | } | |
1636 | ||
1637 | static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1638 | { | |
1639 | struct ip6_tnl *t = netdev_priv(dev); | |
1640 | struct __ip6_tnl_parm *p = &t->parms; | |
1641 | ||
1642 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || | |
1643 | nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || | |
1644 | nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || | |
1645 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || | |
1646 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
a3754133 ND |
1647 | nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) || |
1648 | nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) || | |
c12b395a | 1649 | nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || |
1650 | /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/ | |
1651 | nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || | |
1652 | nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || | |
1653 | nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) | |
1654 | goto nla_put_failure; | |
1655 | return 0; | |
1656 | ||
1657 | nla_put_failure: | |
1658 | return -EMSGSIZE; | |
1659 | } | |
1660 | ||
1661 | static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { | |
1662 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1663 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1664 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1665 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1666 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
1667 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, | |
1668 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, | |
1669 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, | |
1670 | [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1671 | [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, | |
1672 | [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, | |
1673 | }; | |
1674 | ||
1675 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { | |
1676 | .kind = "ip6gre", | |
1677 | .maxtype = IFLA_GRE_MAX, | |
1678 | .policy = ip6gre_policy, | |
1679 | .priv_size = sizeof(struct ip6_tnl), | |
1680 | .setup = ip6gre_tunnel_setup, | |
1681 | .validate = ip6gre_tunnel_validate, | |
1682 | .newlink = ip6gre_newlink, | |
1683 | .changelink = ip6gre_changelink, | |
1684 | .get_size = ip6gre_get_size, | |
1685 | .fill_info = ip6gre_fill_info, | |
1686 | }; | |
1687 | ||
1688 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { | |
1689 | .kind = "ip6gretap", | |
1690 | .maxtype = IFLA_GRE_MAX, | |
1691 | .policy = ip6gre_policy, | |
1692 | .priv_size = sizeof(struct ip6_tnl), | |
1693 | .setup = ip6gre_tap_setup, | |
1694 | .validate = ip6gre_tap_validate, | |
1695 | .newlink = ip6gre_newlink, | |
1696 | .changelink = ip6gre_changelink, | |
1697 | .get_size = ip6gre_get_size, | |
1698 | .fill_info = ip6gre_fill_info, | |
1699 | }; | |
1700 | ||
1701 | /* | |
1702 | * And now the modules code and kernel interface. | |
1703 | */ | |
1704 | ||
1705 | static int __init ip6gre_init(void) | |
1706 | { | |
1707 | int err; | |
1708 | ||
1709 | pr_info("GRE over IPv6 tunneling driver\n"); | |
1710 | ||
1711 | err = register_pernet_device(&ip6gre_net_ops); | |
1712 | if (err < 0) | |
1713 | return err; | |
1714 | ||
1715 | err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1716 | if (err < 0) { | |
1717 | pr_info("%s: can't add protocol\n", __func__); | |
1718 | goto add_proto_failed; | |
1719 | } | |
1720 | ||
1721 | err = rtnl_link_register(&ip6gre_link_ops); | |
1722 | if (err < 0) | |
1723 | goto rtnl_link_failed; | |
1724 | ||
1725 | err = rtnl_link_register(&ip6gre_tap_ops); | |
1726 | if (err < 0) | |
1727 | goto tap_ops_failed; | |
1728 | ||
1729 | out: | |
1730 | return err; | |
1731 | ||
1732 | tap_ops_failed: | |
1733 | rtnl_link_unregister(&ip6gre_link_ops); | |
1734 | rtnl_link_failed: | |
1735 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1736 | add_proto_failed: | |
1737 | unregister_pernet_device(&ip6gre_net_ops); | |
1738 | goto out; | |
1739 | } | |
1740 | ||
1741 | static void __exit ip6gre_fini(void) | |
1742 | { | |
1743 | rtnl_link_unregister(&ip6gre_tap_ops); | |
1744 | rtnl_link_unregister(&ip6gre_link_ops); | |
1745 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1746 | unregister_pernet_device(&ip6gre_net_ops); | |
1747 | } | |
1748 | ||
1749 | module_init(ip6gre_init); | |
1750 | module_exit(ip6gre_fini); | |
1751 | MODULE_LICENSE("GPL"); | |
1752 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); | |
1753 | MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); | |
1754 | MODULE_ALIAS_RTNL_LINK("ip6gre"); | |
1755 | MODULE_ALIAS_NETDEV("ip6gre0"); |