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Commit | Line | Data |
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c12b395a | 1 | /* |
2 | * GRE over IPv6 protocol decoder. | |
3 | * | |
4 | * Authors: Dmitry Kozlov (xeb@mail.ru) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
15 | #include <linux/capability.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/tcp.h> | |
25 | #include <linux/udp.h> | |
26 | #include <linux/if_arp.h> | |
c12b395a | 27 | #include <linux/init.h> |
28 | #include <linux/in6.h> | |
29 | #include <linux/inetdevice.h> | |
30 | #include <linux/igmp.h> | |
31 | #include <linux/netfilter_ipv4.h> | |
32 | #include <linux/etherdevice.h> | |
33 | #include <linux/if_ether.h> | |
34 | #include <linux/hash.h> | |
35 | #include <linux/if_tunnel.h> | |
36 | #include <linux/ip6_tunnel.h> | |
37 | ||
38 | #include <net/sock.h> | |
39 | #include <net/ip.h> | |
c5441932 | 40 | #include <net/ip_tunnels.h> |
c12b395a | 41 | #include <net/icmp.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/addrconf.h> | |
44 | #include <net/arp.h> | |
45 | #include <net/checksum.h> | |
46 | #include <net/dsfield.h> | |
47 | #include <net/inet_ecn.h> | |
48 | #include <net/xfrm.h> | |
49 | #include <net/net_namespace.h> | |
50 | #include <net/netns/generic.h> | |
51 | #include <net/rtnetlink.h> | |
52 | ||
53 | #include <net/ipv6.h> | |
54 | #include <net/ip6_fib.h> | |
55 | #include <net/ip6_route.h> | |
56 | #include <net/ip6_tunnel.h> | |
308edfdf | 57 | #include <net/gre.h> |
c12b395a | 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 | ||
e87a8f24 JK |
64 | #define IP6_GRE_HASH_SIZE_SHIFT 5 |
65 | #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) | |
c12b395a | 66 | |
c7d03a00 | 67 | static unsigned int ip6gre_net_id __read_mostly; |
c12b395a | 68 | struct ip6gre_net { |
e87a8f24 | 69 | struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; |
c12b395a | 70 | |
71 | struct net_device *fb_tunnel_dev; | |
72 | }; | |
73 | ||
74 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly; | |
22f08069 | 75 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; |
c12b395a | 76 | static int ip6gre_tunnel_init(struct net_device *dev); |
77 | static void ip6gre_tunnel_setup(struct net_device *dev); | |
78 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); | |
79 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); | |
80 | ||
81 | /* Tunnel hash table */ | |
82 | ||
83 | /* | |
84 | 4 hash tables: | |
85 | ||
86 | 3: (remote,local) | |
87 | 2: (remote,*) | |
88 | 1: (*,local) | |
89 | 0: (*,*) | |
90 | ||
91 | We require exact key match i.e. if a key is present in packet | |
92 | it will match only tunnel with the same key; if it is not present, | |
93 | it will match only keyless tunnel. | |
94 | ||
95 | All keysless packets, if not matched configured keyless tunnels | |
96 | will match fallback tunnel. | |
97 | */ | |
98 | ||
e87a8f24 | 99 | #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) |
c12b395a | 100 | static u32 HASH_ADDR(const struct in6_addr *addr) |
101 | { | |
102 | u32 hash = ipv6_addr_hash(addr); | |
103 | ||
e87a8f24 | 104 | return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); |
c12b395a | 105 | } |
106 | ||
107 | #define tunnels_r_l tunnels[3] | |
108 | #define tunnels_r tunnels[2] | |
109 | #define tunnels_l tunnels[1] | |
110 | #define tunnels_wc tunnels[0] | |
c12b395a | 111 | |
c12b395a | 112 | /* Given src, dst and key, find appropriate for input tunnel. */ |
113 | ||
114 | static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, | |
115 | const struct in6_addr *remote, const struct in6_addr *local, | |
116 | __be32 key, __be16 gre_proto) | |
117 | { | |
118 | struct net *net = dev_net(dev); | |
119 | int link = dev->ifindex; | |
120 | unsigned int h0 = HASH_ADDR(remote); | |
121 | unsigned int h1 = HASH_KEY(key); | |
122 | struct ip6_tnl *t, *cand = NULL; | |
123 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
124 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? | |
125 | ARPHRD_ETHER : ARPHRD_IP6GRE; | |
126 | int score, cand_score = 4; | |
127 | ||
e086cadc | 128 | for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
c12b395a | 129 | if (!ipv6_addr_equal(local, &t->parms.laddr) || |
130 | !ipv6_addr_equal(remote, &t->parms.raddr) || | |
131 | key != t->parms.i_key || | |
132 | !(t->dev->flags & IFF_UP)) | |
133 | continue; | |
134 | ||
135 | if (t->dev->type != ARPHRD_IP6GRE && | |
136 | t->dev->type != dev_type) | |
137 | continue; | |
138 | ||
139 | score = 0; | |
140 | if (t->parms.link != link) | |
141 | score |= 1; | |
142 | if (t->dev->type != dev_type) | |
143 | score |= 2; | |
144 | if (score == 0) | |
145 | return t; | |
146 | ||
147 | if (score < cand_score) { | |
148 | cand = t; | |
149 | cand_score = score; | |
150 | } | |
151 | } | |
152 | ||
e086cadc | 153 | for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
c12b395a | 154 | if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
155 | key != t->parms.i_key || | |
156 | !(t->dev->flags & IFF_UP)) | |
157 | continue; | |
158 | ||
159 | if (t->dev->type != ARPHRD_IP6GRE && | |
160 | t->dev->type != dev_type) | |
161 | continue; | |
162 | ||
163 | score = 0; | |
164 | if (t->parms.link != link) | |
165 | score |= 1; | |
166 | if (t->dev->type != dev_type) | |
167 | score |= 2; | |
168 | if (score == 0) | |
169 | return t; | |
170 | ||
171 | if (score < cand_score) { | |
172 | cand = t; | |
173 | cand_score = score; | |
174 | } | |
175 | } | |
176 | ||
e086cadc | 177 | for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
c12b395a | 178 | if ((!ipv6_addr_equal(local, &t->parms.laddr) && |
179 | (!ipv6_addr_equal(local, &t->parms.raddr) || | |
180 | !ipv6_addr_is_multicast(local))) || | |
181 | key != t->parms.i_key || | |
182 | !(t->dev->flags & IFF_UP)) | |
183 | continue; | |
184 | ||
185 | if (t->dev->type != ARPHRD_IP6GRE && | |
186 | t->dev->type != dev_type) | |
187 | continue; | |
188 | ||
189 | score = 0; | |
190 | if (t->parms.link != link) | |
191 | score |= 1; | |
192 | if (t->dev->type != dev_type) | |
193 | score |= 2; | |
194 | if (score == 0) | |
195 | return t; | |
196 | ||
197 | if (score < cand_score) { | |
198 | cand = t; | |
199 | cand_score = score; | |
200 | } | |
201 | } | |
202 | ||
e086cadc | 203 | for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
c12b395a | 204 | if (t->parms.i_key != key || |
205 | !(t->dev->flags & IFF_UP)) | |
206 | continue; | |
207 | ||
208 | if (t->dev->type != ARPHRD_IP6GRE && | |
209 | t->dev->type != dev_type) | |
210 | continue; | |
211 | ||
212 | score = 0; | |
213 | if (t->parms.link != link) | |
214 | score |= 1; | |
215 | if (t->dev->type != dev_type) | |
216 | score |= 2; | |
217 | if (score == 0) | |
218 | return t; | |
219 | ||
220 | if (score < cand_score) { | |
221 | cand = t; | |
222 | cand_score = score; | |
223 | } | |
224 | } | |
225 | ||
53b24b8f | 226 | if (cand) |
c12b395a | 227 | return cand; |
228 | ||
229 | dev = ign->fb_tunnel_dev; | |
230 | if (dev->flags & IFF_UP) | |
231 | return netdev_priv(dev); | |
232 | ||
233 | return NULL; | |
234 | } | |
235 | ||
236 | static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, | |
237 | const struct __ip6_tnl_parm *p) | |
238 | { | |
239 | const struct in6_addr *remote = &p->raddr; | |
240 | const struct in6_addr *local = &p->laddr; | |
241 | unsigned int h = HASH_KEY(p->i_key); | |
242 | int prio = 0; | |
243 | ||
244 | if (!ipv6_addr_any(local)) | |
245 | prio |= 1; | |
246 | if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { | |
247 | prio |= 2; | |
248 | h ^= HASH_ADDR(remote); | |
249 | } | |
250 | ||
251 | return &ign->tunnels[prio][h]; | |
252 | } | |
253 | ||
254 | static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, | |
255 | const struct ip6_tnl *t) | |
256 | { | |
257 | return __ip6gre_bucket(ign, &t->parms); | |
258 | } | |
259 | ||
260 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) | |
261 | { | |
262 | struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); | |
263 | ||
264 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
265 | rcu_assign_pointer(*tp, t); | |
266 | } | |
267 | ||
268 | static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) | |
269 | { | |
270 | struct ip6_tnl __rcu **tp; | |
271 | struct ip6_tnl *iter; | |
272 | ||
273 | for (tp = ip6gre_bucket(ign, t); | |
274 | (iter = rtnl_dereference(*tp)) != NULL; | |
275 | tp = &iter->next) { | |
276 | if (t == iter) { | |
277 | rcu_assign_pointer(*tp, t->next); | |
278 | break; | |
279 | } | |
280 | } | |
281 | } | |
282 | ||
283 | static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, | |
284 | const struct __ip6_tnl_parm *parms, | |
285 | int type) | |
286 | { | |
287 | const struct in6_addr *remote = &parms->raddr; | |
288 | const struct in6_addr *local = &parms->laddr; | |
289 | __be32 key = parms->i_key; | |
290 | int link = parms->link; | |
291 | struct ip6_tnl *t; | |
292 | struct ip6_tnl __rcu **tp; | |
293 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
294 | ||
295 | for (tp = __ip6gre_bucket(ign, parms); | |
296 | (t = rtnl_dereference(*tp)) != NULL; | |
297 | tp = &t->next) | |
298 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
299 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
300 | key == t->parms.i_key && | |
301 | link == t->parms.link && | |
302 | type == t->dev->type) | |
303 | break; | |
304 | ||
305 | return t; | |
306 | } | |
307 | ||
308 | static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, | |
309 | const struct __ip6_tnl_parm *parms, int create) | |
310 | { | |
311 | struct ip6_tnl *t, *nt; | |
312 | struct net_device *dev; | |
313 | char name[IFNAMSIZ]; | |
314 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
315 | ||
316 | t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); | |
cd0a0bd9 SK |
317 | if (t && create) |
318 | return NULL; | |
c12b395a | 319 | if (t || !create) |
320 | return t; | |
321 | ||
370bbc00 ED |
322 | if (parms->name[0]) { |
323 | if (!dev_valid_name(parms->name)) | |
324 | return NULL; | |
c12b395a | 325 | strlcpy(name, parms->name, IFNAMSIZ); |
370bbc00 | 326 | } else { |
c12b395a | 327 | strcpy(name, "ip6gre%d"); |
370bbc00 | 328 | } |
c835a677 TG |
329 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
330 | ip6gre_tunnel_setup); | |
c12b395a | 331 | if (!dev) |
332 | return NULL; | |
333 | ||
334 | dev_net_set(dev, net); | |
335 | ||
336 | nt = netdev_priv(dev); | |
337 | nt->parms = *parms; | |
338 | dev->rtnl_link_ops = &ip6gre_link_ops; | |
339 | ||
340 | nt->dev = dev; | |
0bd87628 | 341 | nt->net = dev_net(dev); |
c12b395a | 342 | |
343 | if (register_netdevice(dev) < 0) | |
344 | goto failed_free; | |
345 | ||
128bb975 AK |
346 | ip6gre_tnl_link_config(nt, 1); |
347 | ||
c12b395a | 348 | /* Can use a lockless transmit, unless we generate output sequences */ |
b45bd1d7 | 349 | if (!(nt->parms.o_flags & TUNNEL_SEQ)) |
c12b395a | 350 | dev->features |= NETIF_F_LLTX; |
351 | ||
352 | dev_hold(dev); | |
353 | ip6gre_tunnel_link(ign, nt); | |
354 | return nt; | |
355 | ||
356 | failed_free: | |
357 | free_netdev(dev); | |
358 | return NULL; | |
359 | } | |
360 | ||
361 | static void ip6gre_tunnel_uninit(struct net_device *dev) | |
362 | { | |
22f08069 ND |
363 | struct ip6_tnl *t = netdev_priv(dev); |
364 | struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); | |
c12b395a | 365 | |
22f08069 | 366 | ip6gre_tunnel_unlink(ign, t); |
607f725f | 367 | dst_cache_reset(&t->dst_cache); |
c12b395a | 368 | dev_put(dev); |
369 | } | |
370 | ||
371 | ||
372 | static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
7892032c | 373 | u8 type, u8 code, int offset, __be32 info) |
c12b395a | 374 | { |
929fc032 | 375 | struct net *net = dev_net(skb->dev); |
7892032c ED |
376 | const struct gre_base_hdr *greh; |
377 | const struct ipv6hdr *ipv6h; | |
378 | int grehlen = sizeof(*greh); | |
c12b395a | 379 | struct ip6_tnl *t; |
7892032c | 380 | int key_off = 0; |
c12b395a | 381 | __be16 flags; |
7892032c | 382 | __be32 key; |
c12b395a | 383 | |
7892032c ED |
384 | if (!pskb_may_pull(skb, offset + grehlen)) |
385 | return; | |
386 | greh = (const struct gre_base_hdr *)(skb->data + offset); | |
387 | flags = greh->flags; | |
388 | if (flags & (GRE_VERSION | GRE_ROUTING)) | |
389 | return; | |
390 | if (flags & GRE_CSUM) | |
391 | grehlen += 4; | |
392 | if (flags & GRE_KEY) { | |
393 | key_off = grehlen + offset; | |
394 | grehlen += 4; | |
c12b395a | 395 | } |
396 | ||
7892032c | 397 | if (!pskb_may_pull(skb, offset + grehlen)) |
c12b395a | 398 | return; |
b87fb39e | 399 | ipv6h = (const struct ipv6hdr *)skb->data; |
7892032c ED |
400 | greh = (const struct gre_base_hdr *)(skb->data + offset); |
401 | key = key_off ? *(__be32 *)(skb->data + key_off) : 0; | |
c12b395a | 402 | |
c12b395a | 403 | t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, |
7892032c | 404 | key, greh->protocol); |
63159f29 | 405 | if (!t) |
0c5794a6 | 406 | return; |
c12b395a | 407 | |
408 | switch (type) { | |
c12b395a | 409 | struct ipv6_tlv_tnl_enc_lim *tel; |
fe1a4ca0 | 410 | __u32 teli; |
c12b395a | 411 | case ICMPV6_DEST_UNREACH: |
a46496ce MB |
412 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
413 | t->parms.name); | |
f8d20b46 XL |
414 | if (code != ICMPV6_PORT_UNREACH) |
415 | break; | |
416 | return; | |
c12b395a | 417 | case ICMPV6_TIME_EXCEED: |
418 | if (code == ICMPV6_EXC_HOPLIMIT) { | |
a46496ce MB |
419 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
420 | t->parms.name); | |
f8d20b46 | 421 | break; |
c12b395a | 422 | } |
f8d20b46 | 423 | return; |
c12b395a | 424 | case ICMPV6_PARAMPROB: |
425 | teli = 0; | |
426 | if (code == ICMPV6_HDR_FIELD) | |
427 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); | |
428 | ||
d1e158e2 | 429 | if (teli && teli == be32_to_cpu(info) - 2) { |
c12b395a | 430 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
431 | if (tel->encap_limit == 0) { | |
a46496ce MB |
432 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
433 | t->parms.name); | |
c12b395a | 434 | } |
435 | } else { | |
a46496ce MB |
436 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
437 | t->parms.name); | |
c12b395a | 438 | } |
f8d20b46 | 439 | return; |
c12b395a | 440 | case ICMPV6_PKT_TOOBIG: |
fe1a4ca0 | 441 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
f8d20b46 | 442 | return; |
929fc032 XL |
443 | case NDISC_REDIRECT: |
444 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
445 | sock_net_uid(net, NULL)); | |
446 | return; | |
c12b395a | 447 | } |
448 | ||
449 | if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) | |
450 | t->err_count++; | |
451 | else | |
452 | t->err_count = 1; | |
453 | t->err_time = jiffies; | |
c12b395a | 454 | } |
455 | ||
308edfdf | 456 | static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) |
c12b395a | 457 | { |
458 | const struct ipv6hdr *ipv6h; | |
c12b395a | 459 | struct ip6_tnl *tunnel; |
c12b395a | 460 | |
461 | ipv6h = ipv6_hdr(skb); | |
c12b395a | 462 | tunnel = ip6gre_tunnel_lookup(skb->dev, |
308edfdf TH |
463 | &ipv6h->saddr, &ipv6h->daddr, tpi->key, |
464 | tpi->proto); | |
c12b395a | 465 | if (tunnel) { |
981542c5 | 466 | ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
c12b395a | 467 | |
308edfdf TH |
468 | return PACKET_RCVD; |
469 | } | |
eccc1bb8 | 470 | |
308edfdf TH |
471 | return PACKET_REJECT; |
472 | } | |
eccc1bb8 | 473 | |
308edfdf TH |
474 | static int gre_rcv(struct sk_buff *skb) |
475 | { | |
476 | struct tnl_ptk_info tpi; | |
477 | bool csum_err = false; | |
478 | int hdr_len; | |
eccc1bb8 | 479 | |
e582615a | 480 | hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); |
f132ae7c | 481 | if (hdr_len < 0) |
308edfdf | 482 | goto drop; |
c12b395a | 483 | |
308edfdf TH |
484 | if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) |
485 | goto drop; | |
c12b395a | 486 | |
308edfdf | 487 | if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) |
c12b395a | 488 | return 0; |
c12b395a | 489 | |
308edfdf | 490 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
c12b395a | 491 | drop: |
c12b395a | 492 | kfree_skb(skb); |
493 | return 0; | |
494 | } | |
495 | ||
b05229f4 | 496 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
c12b395a | 497 | { |
b05229f4 TH |
498 | return iptunnel_handle_offloads(skb, |
499 | csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); | |
c12b395a | 500 | } |
501 | ||
b05229f4 TH |
502 | static netdev_tx_t __gre6_xmit(struct sk_buff *skb, |
503 | struct net_device *dev, __u8 dsfield, | |
504 | struct flowi6 *fl6, int encap_limit, | |
505 | __u32 *pmtu, __be16 proto) | |
c12b395a | 506 | { |
c12b395a | 507 | struct ip6_tnl *tunnel = netdev_priv(dev); |
8aec4959 | 508 | __be16 protocol; |
c12b395a | 509 | |
510 | if (dev->type == ARPHRD_ETHER) | |
511 | IPCB(skb)->flags = 0; | |
512 | ||
b05229f4 TH |
513 | if (dev->header_ops && dev->type == ARPHRD_IP6GRE) |
514 | fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; | |
515 | else | |
c12b395a | 516 | fl6->daddr = tunnel->parms.raddr; |
c12b395a | 517 | |
b05229f4 TH |
518 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
519 | tunnel->o_seqno++; | |
c12b395a | 520 | |
336701db PM |
521 | if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) |
522 | return -ENOMEM; | |
523 | ||
b05229f4 | 524 | /* Push GRE header. */ |
8aec4959 | 525 | protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; |
b05229f4 TH |
526 | gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, |
527 | protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno)); | |
c12b395a | 528 | |
b05229f4 TH |
529 | return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, |
530 | NEXTHDR_GRE); | |
c12b395a | 531 | } |
532 | ||
533 | static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) | |
534 | { | |
535 | struct ip6_tnl *t = netdev_priv(dev); | |
536 | const struct iphdr *iph = ip_hdr(skb); | |
537 | int encap_limit = -1; | |
538 | struct flowi6 fl6; | |
539 | __u8 dsfield; | |
540 | __u32 mtu; | |
541 | int err; | |
542 | ||
5146d1f1 BH |
543 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
544 | ||
c12b395a | 545 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
546 | encap_limit = t->parms.encap_limit; | |
547 | ||
548 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
c12b395a | 549 | |
c12b395a | 550 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
0e9a7095 PD |
551 | dsfield = ipv4_get_dsfield(iph); |
552 | else | |
553 | dsfield = ip6_tclass(t->parms.flowinfo); | |
c12b395a | 554 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
555 | fl6.flowi6_mark = skb->mark; | |
0a473b82 CG |
556 | else |
557 | fl6.flowi6_mark = t->parms.fwmark; | |
c12b395a | 558 | |
e2d118a1 LC |
559 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
560 | ||
b05229f4 TH |
561 | err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); |
562 | if (err) | |
563 | return -1; | |
564 | ||
565 | err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, | |
566 | skb->protocol); | |
c12b395a | 567 | if (err != 0) { |
568 | /* XXX: send ICMP error even if DF is not set. */ | |
569 | if (err == -EMSGSIZE) | |
570 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
571 | htonl(mtu)); | |
572 | return -1; | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) | |
579 | { | |
580 | struct ip6_tnl *t = netdev_priv(dev); | |
581 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
582 | int encap_limit = -1; | |
583 | __u16 offset; | |
584 | struct flowi6 fl6; | |
585 | __u8 dsfield; | |
586 | __u32 mtu; | |
587 | int err; | |
588 | ||
589 | if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) | |
590 | return -1; | |
591 | ||
592 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); | |
21b995a9 ED |
593 | /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ |
594 | ipv6h = ipv6_hdr(skb); | |
595 | ||
c12b395a | 596 | if (offset > 0) { |
597 | struct ipv6_tlv_tnl_enc_lim *tel; | |
598 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; | |
599 | if (tel->encap_limit == 0) { | |
600 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
601 | ICMPV6_HDR_FIELD, offset + 2); | |
602 | return -1; | |
603 | } | |
604 | encap_limit = tel->encap_limit - 1; | |
605 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
606 | encap_limit = t->parms.encap_limit; | |
607 | ||
608 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
c12b395a | 609 | |
c12b395a | 610 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
0e9a7095 PD |
611 | dsfield = ipv6_get_dsfield(ipv6h); |
612 | else | |
613 | dsfield = ip6_tclass(t->parms.flowinfo); | |
614 | ||
c12b395a | 615 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 616 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
c12b395a | 617 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
618 | fl6.flowi6_mark = skb->mark; | |
0a473b82 CG |
619 | else |
620 | fl6.flowi6_mark = t->parms.fwmark; | |
c12b395a | 621 | |
e2d118a1 LC |
622 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
623 | ||
b05229f4 TH |
624 | if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) |
625 | return -1; | |
626 | ||
627 | err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, | |
628 | &mtu, skb->protocol); | |
c12b395a | 629 | if (err != 0) { |
630 | if (err == -EMSGSIZE) | |
631 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
632 | return -1; | |
633 | } | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | /** | |
639 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
640 | * @t: the outgoing tunnel device | |
641 | * @hdr: IPv6 header from the incoming packet | |
642 | * | |
643 | * Description: | |
644 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
645 | * doesn't match source of incoming packet. | |
646 | * | |
647 | * Return: | |
648 | * 1 if conflict, | |
649 | * 0 else | |
650 | **/ | |
651 | ||
652 | static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, | |
653 | const struct ipv6hdr *hdr) | |
654 | { | |
655 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
656 | } | |
657 | ||
658 | static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) | |
659 | { | |
660 | struct ip6_tnl *t = netdev_priv(dev); | |
661 | int encap_limit = -1; | |
662 | struct flowi6 fl6; | |
663 | __u32 mtu; | |
664 | int err; | |
665 | ||
666 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
667 | encap_limit = t->parms.encap_limit; | |
668 | ||
669 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
c12b395a | 670 | |
b05229f4 TH |
671 | err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); |
672 | if (err) | |
673 | return err; | |
674 | ||
675 | err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); | |
c12b395a | 676 | |
677 | return err; | |
678 | } | |
679 | ||
680 | static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, | |
681 | struct net_device *dev) | |
682 | { | |
683 | struct ip6_tnl *t = netdev_priv(dev); | |
684 | struct net_device_stats *stats = &t->dev->stats; | |
685 | int ret; | |
686 | ||
d5005140 | 687 | if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) |
41ab3e31 | 688 | goto tx_err; |
c12b395a | 689 | |
690 | switch (skb->protocol) { | |
691 | case htons(ETH_P_IP): | |
692 | ret = ip6gre_xmit_ipv4(skb, dev); | |
693 | break; | |
694 | case htons(ETH_P_IPV6): | |
695 | ret = ip6gre_xmit_ipv6(skb, dev); | |
696 | break; | |
697 | default: | |
698 | ret = ip6gre_xmit_other(skb, dev); | |
699 | break; | |
700 | } | |
701 | ||
702 | if (ret < 0) | |
703 | goto tx_err; | |
704 | ||
705 | return NETDEV_TX_OK; | |
706 | ||
707 | tx_err: | |
708 | stats->tx_errors++; | |
709 | stats->tx_dropped++; | |
710 | kfree_skb(skb); | |
711 | return NETDEV_TX_OK; | |
712 | } | |
713 | ||
e8d67209 | 714 | static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) |
c12b395a | 715 | { |
716 | struct net_device *dev = t->dev; | |
717 | struct __ip6_tnl_parm *p = &t->parms; | |
718 | struct flowi6 *fl6 = &t->fl.u.ip6; | |
c12b395a | 719 | |
720 | if (dev->type != ARPHRD_ETHER) { | |
721 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
722 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
723 | } | |
724 | ||
725 | /* Set up flowi template */ | |
726 | fl6->saddr = p->laddr; | |
727 | fl6->daddr = p->raddr; | |
728 | fl6->flowi6_oif = p->link; | |
729 | fl6->flowlabel = 0; | |
252f3f5a | 730 | fl6->flowi6_proto = IPPROTO_GRE; |
c12b395a | 731 | |
732 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
733 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
734 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
735 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
736 | ||
737 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); | |
738 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
739 | ||
740 | if (p->flags&IP6_TNL_F_CAP_XMIT && | |
741 | p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) | |
742 | dev->flags |= IFF_POINTOPOINT; | |
743 | else | |
744 | dev->flags &= ~IFF_POINTOPOINT; | |
e8d67209 | 745 | } |
c12b395a | 746 | |
e8d67209 PM |
747 | static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, |
748 | int t_hlen) | |
749 | { | |
750 | const struct __ip6_tnl_parm *p = &t->parms; | |
751 | struct net_device *dev = t->dev; | |
c12b395a | 752 | |
753 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
754 | int strict = (ipv6_addr_type(&p->raddr) & | |
755 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
756 | ||
22f08069 | 757 | struct rt6_info *rt = rt6_lookup(t->net, |
c12b395a | 758 | &p->raddr, &p->laddr, |
759 | p->link, strict); | |
760 | ||
63159f29 | 761 | if (!rt) |
c12b395a | 762 | return; |
763 | ||
764 | if (rt->dst.dev) { | |
db2ec95d TH |
765 | dev->hard_header_len = rt->dst.dev->hard_header_len + |
766 | t_hlen; | |
c12b395a | 767 | |
768 | if (set_mtu) { | |
db2ec95d | 769 | dev->mtu = rt->dst.dev->mtu - t_hlen; |
c12b395a | 770 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
771 | dev->mtu -= 8; | |
a9e242ca AD |
772 | if (dev->type == ARPHRD_ETHER) |
773 | dev->mtu -= ETH_HLEN; | |
c12b395a | 774 | |
775 | if (dev->mtu < IPV6_MIN_MTU) | |
776 | dev->mtu = IPV6_MIN_MTU; | |
777 | } | |
778 | } | |
94e187c0 | 779 | ip6_rt_put(rt); |
c12b395a | 780 | } |
c12b395a | 781 | } |
782 | ||
e8d67209 PM |
783 | static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) |
784 | { | |
785 | int t_hlen; | |
786 | ||
787 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); | |
788 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; | |
789 | ||
790 | t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); | |
791 | tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; | |
792 | return t_hlen; | |
793 | } | |
794 | ||
795 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) | |
796 | { | |
797 | ip6gre_tnl_link_config_common(t); | |
798 | ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); | |
799 | } | |
800 | ||
7586f067 PM |
801 | static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, |
802 | const struct __ip6_tnl_parm *p) | |
c12b395a | 803 | { |
804 | t->parms.laddr = p->laddr; | |
805 | t->parms.raddr = p->raddr; | |
806 | t->parms.flags = p->flags; | |
807 | t->parms.hop_limit = p->hop_limit; | |
808 | t->parms.encap_limit = p->encap_limit; | |
809 | t->parms.flowinfo = p->flowinfo; | |
810 | t->parms.link = p->link; | |
811 | t->parms.proto = p->proto; | |
812 | t->parms.i_key = p->i_key; | |
813 | t->parms.o_key = p->o_key; | |
814 | t->parms.i_flags = p->i_flags; | |
815 | t->parms.o_flags = p->o_flags; | |
0a473b82 | 816 | t->parms.fwmark = p->fwmark; |
607f725f | 817 | dst_cache_reset(&t->dst_cache); |
7586f067 PM |
818 | } |
819 | ||
820 | static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, | |
821 | int set_mtu) | |
822 | { | |
823 | ip6gre_tnl_copy_tnl_parm(t, p); | |
c12b395a | 824 | ip6gre_tnl_link_config(t, set_mtu); |
825 | return 0; | |
826 | } | |
827 | ||
828 | static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, | |
829 | const struct ip6_tnl_parm2 *u) | |
830 | { | |
831 | p->laddr = u->laddr; | |
832 | p->raddr = u->raddr; | |
833 | p->flags = u->flags; | |
834 | p->hop_limit = u->hop_limit; | |
835 | p->encap_limit = u->encap_limit; | |
836 | p->flowinfo = u->flowinfo; | |
837 | p->link = u->link; | |
838 | p->i_key = u->i_key; | |
839 | p->o_key = u->o_key; | |
f41fe3c2 TH |
840 | p->i_flags = gre_flags_to_tnl_flags(u->i_flags); |
841 | p->o_flags = gre_flags_to_tnl_flags(u->o_flags); | |
c12b395a | 842 | memcpy(p->name, u->name, sizeof(u->name)); |
843 | } | |
844 | ||
845 | static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, | |
846 | const struct __ip6_tnl_parm *p) | |
847 | { | |
848 | u->proto = IPPROTO_GRE; | |
849 | u->laddr = p->laddr; | |
850 | u->raddr = p->raddr; | |
851 | u->flags = p->flags; | |
852 | u->hop_limit = p->hop_limit; | |
853 | u->encap_limit = p->encap_limit; | |
854 | u->flowinfo = p->flowinfo; | |
855 | u->link = p->link; | |
856 | u->i_key = p->i_key; | |
857 | u->o_key = p->o_key; | |
f41fe3c2 TH |
858 | u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); |
859 | u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); | |
c12b395a | 860 | memcpy(u->name, p->name, sizeof(u->name)); |
861 | } | |
862 | ||
863 | static int ip6gre_tunnel_ioctl(struct net_device *dev, | |
864 | struct ifreq *ifr, int cmd) | |
865 | { | |
866 | int err = 0; | |
867 | struct ip6_tnl_parm2 p; | |
868 | struct __ip6_tnl_parm p1; | |
22f08069 ND |
869 | struct ip6_tnl *t = netdev_priv(dev); |
870 | struct net *net = t->net; | |
c12b395a | 871 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
872 | ||
308edfdf TH |
873 | memset(&p1, 0, sizeof(p1)); |
874 | ||
c12b395a | 875 | switch (cmd) { |
876 | case SIOCGETTUNNEL: | |
c12b395a | 877 | if (dev == ign->fb_tunnel_dev) { |
878 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
879 | err = -EFAULT; | |
880 | break; | |
881 | } | |
882 | ip6gre_tnl_parm_from_user(&p1, &p); | |
883 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
63159f29 | 884 | if (!t) |
22f08069 | 885 | t = netdev_priv(dev); |
c12b395a | 886 | } |
5dbd5068 | 887 | memset(&p, 0, sizeof(p)); |
c12b395a | 888 | ip6gre_tnl_parm_to_user(&p, &t->parms); |
889 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
890 | err = -EFAULT; | |
891 | break; | |
892 | ||
893 | case SIOCADDTUNNEL: | |
894 | case SIOCCHGTUNNEL: | |
895 | err = -EPERM; | |
af31f412 | 896 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
c12b395a | 897 | goto done; |
898 | ||
899 | err = -EFAULT; | |
900 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
901 | goto done; | |
902 | ||
903 | err = -EINVAL; | |
904 | if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) | |
905 | goto done; | |
906 | ||
907 | if (!(p.i_flags&GRE_KEY)) | |
908 | p.i_key = 0; | |
909 | if (!(p.o_flags&GRE_KEY)) | |
910 | p.o_key = 0; | |
911 | ||
912 | ip6gre_tnl_parm_from_user(&p1, &p); | |
913 | t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
914 | ||
915 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
53b24b8f | 916 | if (t) { |
c12b395a | 917 | if (t->dev != dev) { |
918 | err = -EEXIST; | |
919 | break; | |
920 | } | |
921 | } else { | |
922 | t = netdev_priv(dev); | |
923 | ||
924 | ip6gre_tunnel_unlink(ign, t); | |
925 | synchronize_net(); | |
926 | ip6gre_tnl_change(t, &p1, 1); | |
927 | ip6gre_tunnel_link(ign, t); | |
928 | netdev_state_change(dev); | |
929 | } | |
930 | } | |
931 | ||
932 | if (t) { | |
933 | err = 0; | |
934 | ||
5dbd5068 | 935 | memset(&p, 0, sizeof(p)); |
c12b395a | 936 | ip6gre_tnl_parm_to_user(&p, &t->parms); |
937 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
938 | err = -EFAULT; | |
939 | } else | |
940 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
941 | break; | |
942 | ||
943 | case SIOCDELTUNNEL: | |
944 | err = -EPERM; | |
af31f412 | 945 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
c12b395a | 946 | goto done; |
947 | ||
948 | if (dev == ign->fb_tunnel_dev) { | |
949 | err = -EFAULT; | |
950 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
951 | goto done; | |
952 | err = -ENOENT; | |
953 | ip6gre_tnl_parm_from_user(&p1, &p); | |
954 | t = ip6gre_tunnel_locate(net, &p1, 0); | |
63159f29 | 955 | if (!t) |
c12b395a | 956 | goto done; |
957 | err = -EPERM; | |
958 | if (t == netdev_priv(ign->fb_tunnel_dev)) | |
959 | goto done; | |
960 | dev = t->dev; | |
961 | } | |
962 | unregister_netdevice(dev); | |
963 | err = 0; | |
964 | break; | |
965 | ||
966 | default: | |
967 | err = -EINVAL; | |
968 | } | |
969 | ||
970 | done: | |
971 | return err; | |
972 | } | |
973 | ||
c12b395a | 974 | static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, |
76cc0d32 XL |
975 | unsigned short type, const void *daddr, |
976 | const void *saddr, unsigned int len) | |
c12b395a | 977 | { |
978 | struct ip6_tnl *t = netdev_priv(dev); | |
76cc0d32 XL |
979 | struct ipv6hdr *ipv6h; |
980 | __be16 *p; | |
c12b395a | 981 | |
76cc0d32 XL |
982 | ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); |
983 | ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, | |
984 | t->fl.u.ip6.flowlabel, | |
985 | true, &t->fl.u.ip6)); | |
c12b395a | 986 | ipv6h->hop_limit = t->parms.hop_limit; |
987 | ipv6h->nexthdr = NEXTHDR_GRE; | |
988 | ipv6h->saddr = t->parms.laddr; | |
989 | ipv6h->daddr = t->parms.raddr; | |
990 | ||
76cc0d32 XL |
991 | p = (__be16 *)(ipv6h + 1); |
992 | p[0] = t->parms.o_flags; | |
993 | p[1] = htons(type); | |
c12b395a | 994 | |
995 | /* | |
996 | * Set the source hardware address. | |
997 | */ | |
998 | ||
999 | if (saddr) | |
1000 | memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); | |
1001 | if (daddr) | |
1002 | memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); | |
1003 | if (!ipv6_addr_any(&ipv6h->daddr)) | |
1004 | return t->hlen; | |
1005 | ||
1006 | return -t->hlen; | |
1007 | } | |
1008 | ||
c12b395a | 1009 | static const struct header_ops ip6gre_header_ops = { |
1010 | .create = ip6gre_header, | |
c12b395a | 1011 | }; |
1012 | ||
1013 | static const struct net_device_ops ip6gre_netdev_ops = { | |
1014 | .ndo_init = ip6gre_tunnel_init, | |
1015 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1016 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1017 | .ndo_do_ioctl = ip6gre_tunnel_ioctl, | |
b05229f4 | 1018 | .ndo_change_mtu = ip6_tnl_change_mtu, |
f61dd388 | 1019 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 1020 | .ndo_get_iflink = ip6_tnl_get_iflink, |
c12b395a | 1021 | }; |
1022 | ||
1023 | static void ip6gre_dev_free(struct net_device *dev) | |
1024 | { | |
cdf3464e MKL |
1025 | struct ip6_tnl *t = netdev_priv(dev); |
1026 | ||
607f725f | 1027 | dst_cache_destroy(&t->dst_cache); |
c12b395a | 1028 | free_percpu(dev->tstats); |
c12b395a | 1029 | } |
1030 | ||
1031 | static void ip6gre_tunnel_setup(struct net_device *dev) | |
1032 | { | |
c12b395a | 1033 | dev->netdev_ops = &ip6gre_netdev_ops; |
cf124db5 DM |
1034 | dev->needs_free_netdev = true; |
1035 | dev->priv_destructor = ip6gre_dev_free; | |
c12b395a | 1036 | |
1037 | dev->type = ARPHRD_IP6GRE; | |
b05229f4 | 1038 | |
c12b395a | 1039 | dev->flags |= IFF_NOARP; |
c12b395a | 1040 | dev->addr_len = sizeof(struct in6_addr); |
02875878 | 1041 | netif_keep_dst(dev); |
45ce0fd1 FJ |
1042 | /* This perm addr will be used as interface identifier by IPv6 */ |
1043 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1044 | eth_random_addr(dev->perm_addr); | |
c12b395a | 1045 | } |
1046 | ||
e5a9336a AK |
1047 | #define GRE6_FEATURES (NETIF_F_SG | \ |
1048 | NETIF_F_FRAGLIST | \ | |
1049 | NETIF_F_HIGHDMA | \ | |
1050 | NETIF_F_HW_CSUM) | |
1051 | ||
1052 | static void ip6gre_tnl_init_features(struct net_device *dev) | |
1053 | { | |
1054 | struct ip6_tnl *nt = netdev_priv(dev); | |
1055 | ||
1056 | dev->features |= GRE6_FEATURES; | |
1057 | dev->hw_features |= GRE6_FEATURES; | |
1058 | ||
1059 | if (!(nt->parms.o_flags & TUNNEL_SEQ)) { | |
1060 | /* TCP offload with GRE SEQ is not supported, nor | |
1061 | * can we support 2 levels of outer headers requiring | |
1062 | * an update. | |
1063 | */ | |
1064 | if (!(nt->parms.o_flags & TUNNEL_CSUM) || | |
1065 | nt->encap.type == TUNNEL_ENCAP_NONE) { | |
1066 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1067 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1068 | } | |
1069 | ||
1070 | /* Can use a lockless transmit, unless we generate | |
1071 | * output sequences | |
1072 | */ | |
1073 | dev->features |= NETIF_F_LLTX; | |
1074 | } | |
1075 | } | |
1076 | ||
a3c119d3 | 1077 | static int ip6gre_tunnel_init_common(struct net_device *dev) |
c12b395a | 1078 | { |
1079 | struct ip6_tnl *tunnel; | |
cdf3464e | 1080 | int ret; |
b05229f4 | 1081 | int t_hlen; |
c12b395a | 1082 | |
1083 | tunnel = netdev_priv(dev); | |
1084 | ||
1085 | tunnel->dev = dev; | |
0bd87628 | 1086 | tunnel->net = dev_net(dev); |
c12b395a | 1087 | strcpy(tunnel->parms.name, dev->name); |
1088 | ||
a3c119d3 MKL |
1089 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
1090 | if (!dev->tstats) | |
1091 | return -ENOMEM; | |
1092 | ||
607f725f | 1093 | ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
cdf3464e MKL |
1094 | if (ret) { |
1095 | free_percpu(dev->tstats); | |
1096 | dev->tstats = NULL; | |
1097 | return ret; | |
1098 | } | |
1099 | ||
e8d67209 | 1100 | t_hlen = ip6gre_calc_hlen(tunnel); |
db2ec95d | 1101 | dev->mtu = ETH_DATA_LEN - t_hlen; |
1b227e53 HY |
1102 | if (dev->type == ARPHRD_ETHER) |
1103 | dev->mtu -= ETH_HLEN; | |
b05229f4 TH |
1104 | if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1105 | dev->mtu -= 8; | |
1106 | ||
e5a9336a AK |
1107 | ip6gre_tnl_init_features(dev); |
1108 | ||
a3c119d3 MKL |
1109 | return 0; |
1110 | } | |
1111 | ||
1112 | static int ip6gre_tunnel_init(struct net_device *dev) | |
1113 | { | |
1114 | struct ip6_tnl *tunnel; | |
1115 | int ret; | |
1116 | ||
1117 | ret = ip6gre_tunnel_init_common(dev); | |
1118 | if (ret) | |
1119 | return ret; | |
1120 | ||
1121 | tunnel = netdev_priv(dev); | |
1122 | ||
c12b395a | 1123 | memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); |
1124 | memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); | |
1125 | ||
1126 | if (ipv6_addr_any(&tunnel->parms.raddr)) | |
1127 | dev->header_ops = &ip6gre_header_ops; | |
1128 | ||
c12b395a | 1129 | return 0; |
1130 | } | |
1131 | ||
1132 | static void ip6gre_fb_tunnel_init(struct net_device *dev) | |
1133 | { | |
1134 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1135 | ||
1136 | tunnel->dev = dev; | |
0bd87628 | 1137 | tunnel->net = dev_net(dev); |
c12b395a | 1138 | strcpy(tunnel->parms.name, dev->name); |
1139 | ||
1140 | tunnel->hlen = sizeof(struct ipv6hdr) + 4; | |
1141 | ||
1142 | dev_hold(dev); | |
1143 | } | |
1144 | ||
1145 | ||
1146 | static struct inet6_protocol ip6gre_protocol __read_mostly = { | |
308edfdf | 1147 | .handler = gre_rcv, |
c12b395a | 1148 | .err_handler = ip6gre_err, |
1149 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1150 | }; | |
1151 | ||
22f08069 | 1152 | static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) |
c12b395a | 1153 | { |
22f08069 ND |
1154 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
1155 | struct net_device *dev, *aux; | |
c12b395a | 1156 | int prio; |
1157 | ||
22f08069 ND |
1158 | for_each_netdev_safe(net, dev, aux) |
1159 | if (dev->rtnl_link_ops == &ip6gre_link_ops || | |
1160 | dev->rtnl_link_ops == &ip6gre_tap_ops) | |
1161 | unregister_netdevice_queue(dev, head); | |
1162 | ||
c12b395a | 1163 | for (prio = 0; prio < 4; prio++) { |
1164 | int h; | |
e87a8f24 | 1165 | for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { |
c12b395a | 1166 | struct ip6_tnl *t; |
1167 | ||
1168 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
1169 | ||
53b24b8f | 1170 | while (t) { |
22f08069 ND |
1171 | /* If dev is in the same netns, it has already |
1172 | * been added to the list by the previous loop. | |
1173 | */ | |
1174 | if (!net_eq(dev_net(t->dev), net)) | |
1175 | unregister_netdevice_queue(t->dev, | |
1176 | head); | |
c12b395a | 1177 | t = rtnl_dereference(t->next); |
1178 | } | |
1179 | } | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | static int __net_init ip6gre_init_net(struct net *net) | |
1184 | { | |
1185 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1186 | int err; | |
1187 | ||
1188 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", | |
c835a677 TG |
1189 | NET_NAME_UNKNOWN, |
1190 | ip6gre_tunnel_setup); | |
c12b395a | 1191 | if (!ign->fb_tunnel_dev) { |
1192 | err = -ENOMEM; | |
1193 | goto err_alloc_dev; | |
1194 | } | |
1195 | dev_net_set(ign->fb_tunnel_dev, net); | |
22f08069 ND |
1196 | /* FB netdevice is special: we have one, and only one per netns. |
1197 | * Allowing to move it to another netns is clearly unsafe. | |
1198 | */ | |
1199 | ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
1200 | ||
c12b395a | 1201 | |
1202 | ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); | |
1203 | ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; | |
1204 | ||
1205 | err = register_netdev(ign->fb_tunnel_dev); | |
1206 | if (err) | |
1207 | goto err_reg_dev; | |
1208 | ||
1209 | rcu_assign_pointer(ign->tunnels_wc[0], | |
1210 | netdev_priv(ign->fb_tunnel_dev)); | |
1211 | return 0; | |
1212 | ||
1213 | err_reg_dev: | |
cf124db5 | 1214 | free_netdev(ign->fb_tunnel_dev); |
c12b395a | 1215 | err_alloc_dev: |
1216 | return err; | |
1217 | } | |
1218 | ||
bb401cae | 1219 | static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) |
c12b395a | 1220 | { |
bb401cae | 1221 | struct net *net; |
c12b395a | 1222 | LIST_HEAD(list); |
1223 | ||
c12b395a | 1224 | rtnl_lock(); |
bb401cae ED |
1225 | list_for_each_entry(net, net_list, exit_list) |
1226 | ip6gre_destroy_tunnels(net, &list); | |
c12b395a | 1227 | unregister_netdevice_many(&list); |
1228 | rtnl_unlock(); | |
1229 | } | |
1230 | ||
1231 | static struct pernet_operations ip6gre_net_ops = { | |
1232 | .init = ip6gre_init_net, | |
bb401cae | 1233 | .exit_batch = ip6gre_exit_batch_net, |
c12b395a | 1234 | .id = &ip6gre_net_id, |
1235 | .size = sizeof(struct ip6gre_net), | |
1236 | }; | |
1237 | ||
a8b8a889 MS |
1238 | static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
1239 | struct netlink_ext_ack *extack) | |
c12b395a | 1240 | { |
1241 | __be16 flags; | |
1242 | ||
1243 | if (!data) | |
1244 | return 0; | |
1245 | ||
1246 | flags = 0; | |
1247 | if (data[IFLA_GRE_IFLAGS]) | |
1248 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1249 | if (data[IFLA_GRE_OFLAGS]) | |
1250 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1251 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1252 | return -EINVAL; | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
a8b8a889 MS |
1257 | static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1258 | struct netlink_ext_ack *extack) | |
c12b395a | 1259 | { |
1260 | struct in6_addr daddr; | |
1261 | ||
1262 | if (tb[IFLA_ADDRESS]) { | |
1263 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1264 | return -EINVAL; | |
1265 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1266 | return -EADDRNOTAVAIL; | |
1267 | } | |
1268 | ||
1269 | if (!data) | |
1270 | goto out; | |
1271 | ||
1272 | if (data[IFLA_GRE_REMOTE]) { | |
67b61f6c | 1273 | daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); |
c12b395a | 1274 | if (ipv6_addr_any(&daddr)) |
1275 | return -EINVAL; | |
1276 | } | |
1277 | ||
1278 | out: | |
a8b8a889 | 1279 | return ip6gre_tunnel_validate(tb, data, extack); |
c12b395a | 1280 | } |
1281 | ||
1282 | ||
1283 | static void ip6gre_netlink_parms(struct nlattr *data[], | |
1284 | struct __ip6_tnl_parm *parms) | |
1285 | { | |
1286 | memset(parms, 0, sizeof(*parms)); | |
1287 | ||
1288 | if (!data) | |
1289 | return; | |
1290 | ||
1291 | if (data[IFLA_GRE_LINK]) | |
1292 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1293 | ||
1294 | if (data[IFLA_GRE_IFLAGS]) | |
f41fe3c2 TH |
1295 | parms->i_flags = gre_flags_to_tnl_flags( |
1296 | nla_get_be16(data[IFLA_GRE_IFLAGS])); | |
c12b395a | 1297 | |
1298 | if (data[IFLA_GRE_OFLAGS]) | |
f41fe3c2 TH |
1299 | parms->o_flags = gre_flags_to_tnl_flags( |
1300 | nla_get_be16(data[IFLA_GRE_OFLAGS])); | |
c12b395a | 1301 | |
1302 | if (data[IFLA_GRE_IKEY]) | |
1303 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1304 | ||
1305 | if (data[IFLA_GRE_OKEY]) | |
1306 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1307 | ||
1308 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 1309 | parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); |
c12b395a | 1310 | |
1311 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 1312 | parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); |
c12b395a | 1313 | |
1314 | if (data[IFLA_GRE_TTL]) | |
1315 | parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); | |
1316 | ||
1317 | if (data[IFLA_GRE_ENCAP_LIMIT]) | |
1318 | parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); | |
1319 | ||
1320 | if (data[IFLA_GRE_FLOWINFO]) | |
c2675de4 | 1321 | parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); |
c12b395a | 1322 | |
1323 | if (data[IFLA_GRE_FLAGS]) | |
1324 | parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); | |
0a473b82 CG |
1325 | |
1326 | if (data[IFLA_GRE_FWMARK]) | |
1327 | parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); | |
c12b395a | 1328 | } |
1329 | ||
1330 | static int ip6gre_tap_init(struct net_device *dev) | |
1331 | { | |
a3c119d3 | 1332 | int ret; |
c12b395a | 1333 | |
a3c119d3 MKL |
1334 | ret = ip6gre_tunnel_init_common(dev); |
1335 | if (ret) | |
1336 | return ret; | |
c12b395a | 1337 | |
0a46baaf SC |
1338 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1339 | ||
c12b395a | 1340 | return 0; |
1341 | } | |
1342 | ||
1343 | static const struct net_device_ops ip6gre_tap_netdev_ops = { | |
1344 | .ndo_init = ip6gre_tap_init, | |
1345 | .ndo_uninit = ip6gre_tunnel_uninit, | |
1346 | .ndo_start_xmit = ip6gre_tunnel_xmit, | |
1347 | .ndo_set_mac_address = eth_mac_addr, | |
1348 | .ndo_validate_addr = eth_validate_addr, | |
b05229f4 | 1349 | .ndo_change_mtu = ip6_tnl_change_mtu, |
f61dd388 | 1350 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
ecf2c06a | 1351 | .ndo_get_iflink = ip6_tnl_get_iflink, |
c12b395a | 1352 | }; |
1353 | ||
1354 | static void ip6gre_tap_setup(struct net_device *dev) | |
1355 | { | |
1356 | ||
1357 | ether_setup(dev); | |
1358 | ||
2c52129a | 1359 | dev->max_mtu = 0; |
c12b395a | 1360 | dev->netdev_ops = &ip6gre_tap_netdev_ops; |
cf124db5 DM |
1361 | dev->needs_free_netdev = true; |
1362 | dev->priv_destructor = ip6gre_dev_free; | |
c12b395a | 1363 | |
c12b395a | 1364 | dev->features |= NETIF_F_NETNS_LOCAL; |
d13b161c | 1365 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
0a46baaf | 1366 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
2d40557c | 1367 | netif_keep_dst(dev); |
c12b395a | 1368 | } |
1369 | ||
1faf3d9f TH |
1370 | static bool ip6gre_netlink_encap_parms(struct nlattr *data[], |
1371 | struct ip_tunnel_encap *ipencap) | |
1372 | { | |
1373 | bool ret = false; | |
1374 | ||
1375 | memset(ipencap, 0, sizeof(*ipencap)); | |
1376 | ||
1377 | if (!data) | |
1378 | return ret; | |
1379 | ||
1380 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
1381 | ret = true; | |
1382 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
1383 | } | |
1384 | ||
1385 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
1386 | ret = true; | |
1387 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
1388 | } | |
1389 | ||
1390 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
1391 | ret = true; | |
1392 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); | |
1393 | } | |
1394 | ||
1395 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
1396 | ret = true; | |
1397 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); | |
1398 | } | |
1399 | ||
1400 | return ret; | |
1401 | } | |
1402 | ||
cda5a758 PM |
1403 | static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, |
1404 | struct nlattr *tb[], struct nlattr *data[], | |
1405 | struct netlink_ext_ack *extack) | |
c12b395a | 1406 | { |
1407 | struct ip6_tnl *nt; | |
1408 | struct net *net = dev_net(dev); | |
1faf3d9f | 1409 | struct ip_tunnel_encap ipencap; |
c12b395a | 1410 | int err; |
1411 | ||
1412 | nt = netdev_priv(dev); | |
1faf3d9f TH |
1413 | |
1414 | if (ip6gre_netlink_encap_parms(data, &ipencap)) { | |
1415 | int err = ip6_tnl_encap_setup(nt, &ipencap); | |
1416 | ||
1417 | if (err < 0) | |
1418 | return err; | |
1419 | } | |
1420 | ||
c12b395a | 1421 | ip6gre_netlink_parms(data, &nt->parms); |
1422 | ||
1423 | if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) | |
1424 | return -EEXIST; | |
1425 | ||
1426 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1427 | eth_hw_addr_random(dev); | |
1428 | ||
1429 | nt->dev = dev; | |
0bd87628 | 1430 | nt->net = dev_net(dev); |
c12b395a | 1431 | |
c12b395a | 1432 | err = register_netdevice(dev); |
1433 | if (err) | |
1434 | goto out; | |
1435 | ||
128bb975 AK |
1436 | if (tb[IFLA_MTU]) |
1437 | ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
1438 | ||
c12b395a | 1439 | dev_hold(dev); |
c12b395a | 1440 | |
1441 | out: | |
1442 | return err; | |
cda5a758 PM |
1443 | } |
1444 | ||
1445 | static int ip6gre_newlink(struct net *src_net, struct net_device *dev, | |
1446 | struct nlattr *tb[], struct nlattr *data[], | |
1447 | struct netlink_ext_ack *extack) | |
1448 | { | |
1449 | int err = ip6gre_newlink_common(src_net, dev, tb, data, extack); | |
1450 | struct ip6_tnl *nt = netdev_priv(dev); | |
1451 | struct net *net = dev_net(dev); | |
1452 | ||
1453 | if (!err) { | |
1454 | ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); | |
1455 | ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); | |
1456 | } | |
1457 | return err; | |
c12b395a | 1458 | } |
1459 | ||
6c35dfed PM |
1460 | static struct ip6_tnl * |
1461 | ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], | |
1462 | struct nlattr *data[], struct __ip6_tnl_parm *p_p, | |
1463 | struct netlink_ext_ack *extack) | |
c12b395a | 1464 | { |
22f08069 ND |
1465 | struct ip6_tnl *t, *nt = netdev_priv(dev); |
1466 | struct net *net = nt->net; | |
c12b395a | 1467 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
1faf3d9f | 1468 | struct ip_tunnel_encap ipencap; |
c12b395a | 1469 | |
1470 | if (dev == ign->fb_tunnel_dev) | |
6c35dfed | 1471 | return ERR_PTR(-EINVAL); |
c12b395a | 1472 | |
1faf3d9f TH |
1473 | if (ip6gre_netlink_encap_parms(data, &ipencap)) { |
1474 | int err = ip6_tnl_encap_setup(nt, &ipencap); | |
1475 | ||
1476 | if (err < 0) | |
6c35dfed | 1477 | return ERR_PTR(err); |
1faf3d9f TH |
1478 | } |
1479 | ||
6c35dfed | 1480 | ip6gre_netlink_parms(data, p_p); |
c12b395a | 1481 | |
6c35dfed | 1482 | t = ip6gre_tunnel_locate(net, p_p, 0); |
c12b395a | 1483 | |
1484 | if (t) { | |
1485 | if (t->dev != dev) | |
6c35dfed | 1486 | return ERR_PTR(-EEXIST); |
c12b395a | 1487 | } else { |
1488 | t = nt; | |
c12b395a | 1489 | } |
1490 | ||
6c35dfed PM |
1491 | return t; |
1492 | } | |
1493 | ||
1494 | static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1495 | struct nlattr *data[], | |
1496 | struct netlink_ext_ack *extack) | |
1497 | { | |
7b7d41fb OM |
1498 | struct ip6_tnl *t = netdev_priv(dev); |
1499 | struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); | |
6c35dfed | 1500 | struct __ip6_tnl_parm p; |
6c35dfed PM |
1501 | |
1502 | t = ip6gre_changelink_common(dev, tb, data, &p, extack); | |
1503 | if (IS_ERR(t)) | |
1504 | return PTR_ERR(t); | |
1505 | ||
6a61d4db ND |
1506 | ip6gre_tunnel_unlink(ign, t); |
1507 | ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); | |
1508 | ip6gre_tunnel_link(ign, t); | |
c12b395a | 1509 | return 0; |
1510 | } | |
1511 | ||
54d63f78 ND |
1512 | static void ip6gre_dellink(struct net_device *dev, struct list_head *head) |
1513 | { | |
1514 | struct net *net = dev_net(dev); | |
1515 | struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); | |
1516 | ||
1517 | if (dev != ign->fb_tunnel_dev) | |
1518 | unregister_netdevice_queue(dev, head); | |
1519 | } | |
1520 | ||
c12b395a | 1521 | static size_t ip6gre_get_size(const struct net_device *dev) |
1522 | { | |
1523 | return | |
1524 | /* IFLA_GRE_LINK */ | |
1525 | nla_total_size(4) + | |
1526 | /* IFLA_GRE_IFLAGS */ | |
1527 | nla_total_size(2) + | |
1528 | /* IFLA_GRE_OFLAGS */ | |
1529 | nla_total_size(2) + | |
1530 | /* IFLA_GRE_IKEY */ | |
1531 | nla_total_size(4) + | |
1532 | /* IFLA_GRE_OKEY */ | |
1533 | nla_total_size(4) + | |
1534 | /* IFLA_GRE_LOCAL */ | |
a3754133 | 1535 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1536 | /* IFLA_GRE_REMOTE */ |
a3754133 | 1537 | nla_total_size(sizeof(struct in6_addr)) + |
c12b395a | 1538 | /* IFLA_GRE_TTL */ |
1539 | nla_total_size(1) + | |
c12b395a | 1540 | /* IFLA_GRE_ENCAP_LIMIT */ |
1541 | nla_total_size(1) + | |
1542 | /* IFLA_GRE_FLOWINFO */ | |
1543 | nla_total_size(4) + | |
1544 | /* IFLA_GRE_FLAGS */ | |
1545 | nla_total_size(4) + | |
1faf3d9f TH |
1546 | /* IFLA_GRE_ENCAP_TYPE */ |
1547 | nla_total_size(2) + | |
1548 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1549 | nla_total_size(2) + | |
1550 | /* IFLA_GRE_ENCAP_SPORT */ | |
1551 | nla_total_size(2) + | |
1552 | /* IFLA_GRE_ENCAP_DPORT */ | |
1553 | nla_total_size(2) + | |
0a473b82 CG |
1554 | /* IFLA_GRE_FWMARK */ |
1555 | nla_total_size(4) + | |
c12b395a | 1556 | 0; |
1557 | } | |
1558 | ||
1559 | static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1560 | { | |
1561 | struct ip6_tnl *t = netdev_priv(dev); | |
1562 | struct __ip6_tnl_parm *p = &t->parms; | |
1563 | ||
1564 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || | |
f41fe3c2 TH |
1565 | nla_put_be16(skb, IFLA_GRE_IFLAGS, |
1566 | gre_tnl_flags_to_gre_flags(p->i_flags)) || | |
1567 | nla_put_be16(skb, IFLA_GRE_OFLAGS, | |
1568 | gre_tnl_flags_to_gre_flags(p->o_flags)) || | |
c12b395a | 1569 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1570 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1571 | nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || |
1572 | nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || | |
c12b395a | 1573 | nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || |
c12b395a | 1574 | nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || |
1575 | nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || | |
0a473b82 CG |
1576 | nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || |
1577 | nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) | |
c12b395a | 1578 | goto nla_put_failure; |
1faf3d9f TH |
1579 | |
1580 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1581 | t->encap.type) || | |
1582 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, | |
1583 | t->encap.sport) || | |
1584 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1585 | t->encap.dport) || | |
1586 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, | |
1587 | t->encap.flags)) | |
1588 | goto nla_put_failure; | |
1589 | ||
c12b395a | 1590 | return 0; |
1591 | ||
1592 | nla_put_failure: | |
1593 | return -EMSGSIZE; | |
1594 | } | |
1595 | ||
1596 | static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { | |
1597 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1598 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1599 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1600 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1601 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
1602 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, | |
1603 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, | |
1604 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, | |
1605 | [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1606 | [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, | |
1607 | [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, | |
1faf3d9f TH |
1608 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1609 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1610 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1611 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
0a473b82 | 1612 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
c12b395a | 1613 | }; |
1614 | ||
1615 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { | |
1616 | .kind = "ip6gre", | |
1617 | .maxtype = IFLA_GRE_MAX, | |
1618 | .policy = ip6gre_policy, | |
1619 | .priv_size = sizeof(struct ip6_tnl), | |
1620 | .setup = ip6gre_tunnel_setup, | |
1621 | .validate = ip6gre_tunnel_validate, | |
1622 | .newlink = ip6gre_newlink, | |
1623 | .changelink = ip6gre_changelink, | |
54d63f78 | 1624 | .dellink = ip6gre_dellink, |
c12b395a | 1625 | .get_size = ip6gre_get_size, |
1626 | .fill_info = ip6gre_fill_info, | |
1728d4fa | 1627 | .get_link_net = ip6_tnl_get_link_net, |
c12b395a | 1628 | }; |
1629 | ||
1630 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { | |
1631 | .kind = "ip6gretap", | |
1632 | .maxtype = IFLA_GRE_MAX, | |
1633 | .policy = ip6gre_policy, | |
1634 | .priv_size = sizeof(struct ip6_tnl), | |
1635 | .setup = ip6gre_tap_setup, | |
1636 | .validate = ip6gre_tap_validate, | |
1637 | .newlink = ip6gre_newlink, | |
1638 | .changelink = ip6gre_changelink, | |
1639 | .get_size = ip6gre_get_size, | |
1640 | .fill_info = ip6gre_fill_info, | |
3390e397 | 1641 | .get_link_net = ip6_tnl_get_link_net, |
c12b395a | 1642 | }; |
1643 | ||
1644 | /* | |
1645 | * And now the modules code and kernel interface. | |
1646 | */ | |
1647 | ||
1648 | static int __init ip6gre_init(void) | |
1649 | { | |
1650 | int err; | |
1651 | ||
1652 | pr_info("GRE over IPv6 tunneling driver\n"); | |
1653 | ||
1654 | err = register_pernet_device(&ip6gre_net_ops); | |
1655 | if (err < 0) | |
1656 | return err; | |
1657 | ||
1658 | err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1659 | if (err < 0) { | |
1660 | pr_info("%s: can't add protocol\n", __func__); | |
1661 | goto add_proto_failed; | |
1662 | } | |
1663 | ||
1664 | err = rtnl_link_register(&ip6gre_link_ops); | |
1665 | if (err < 0) | |
1666 | goto rtnl_link_failed; | |
1667 | ||
1668 | err = rtnl_link_register(&ip6gre_tap_ops); | |
1669 | if (err < 0) | |
1670 | goto tap_ops_failed; | |
1671 | ||
1672 | out: | |
1673 | return err; | |
1674 | ||
1675 | tap_ops_failed: | |
1676 | rtnl_link_unregister(&ip6gre_link_ops); | |
1677 | rtnl_link_failed: | |
1678 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1679 | add_proto_failed: | |
1680 | unregister_pernet_device(&ip6gre_net_ops); | |
1681 | goto out; | |
1682 | } | |
1683 | ||
1684 | static void __exit ip6gre_fini(void) | |
1685 | { | |
1686 | rtnl_link_unregister(&ip6gre_tap_ops); | |
1687 | rtnl_link_unregister(&ip6gre_link_ops); | |
1688 | inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); | |
1689 | unregister_pernet_device(&ip6gre_net_ops); | |
1690 | } | |
1691 | ||
1692 | module_init(ip6gre_init); | |
1693 | module_exit(ip6gre_fini); | |
1694 | MODULE_LICENSE("GPL"); | |
1695 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); | |
1696 | MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); | |
1697 | MODULE_ALIAS_RTNL_LINK("ip6gre"); | |
5a4ee9a9 | 1698 | MODULE_ALIAS_RTNL_LINK("ip6gretap"); |
c12b395a | 1699 | MODULE_ALIAS_NETDEV("ip6gre0"); |