Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
18 | */ |
19 | ||
f3213831 JP |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include <linux/init.h> | |
36 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 37 | #include <linux/if_ether.h> |
1da177e4 LT |
38 | |
39 | #include <net/sock.h> | |
40 | #include <net/snmp.h> | |
41 | ||
42 | #include <net/ipv6.h> | |
43 | #include <net/protocol.h> | |
44 | #include <net/transp_v6.h> | |
45 | #include <net/ip6_fib.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <net/ndisc.h> | |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip.h> | |
50 | #include <net/udp.h> | |
51 | #include <net/icmp.h> | |
c5441932 | 52 | #include <net/ip_tunnels.h> |
1da177e4 LT |
53 | #include <net/inet_ecn.h> |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
8190d900 PE |
56 | #include <net/net_namespace.h> |
57 | #include <net/netns/generic.h> | |
1da177e4 LT |
58 | |
59 | /* | |
60 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
61 | ||
62 | For comments look at net/ipv4/ip_gre.c --ANK | |
63 | */ | |
64 | ||
65 | #define HASH_SIZE 16 | |
e69a4adc | 66 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 67 | |
f4e0b4c5 ND |
68 | static bool log_ecn_error = true; |
69 | module_param(log_ecn_error, bool, 0644); | |
70 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
71 | ||
15fc1f70 | 72 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 73 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 74 | static void ipip6_dev_free(struct net_device *dev); |
218774dc HFS |
75 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
76 | __be32 *v4dst); | |
ba3e3f50 | 77 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 78 | |
f99189b1 | 79 | static int sit_net_id __read_mostly; |
8190d900 | 80 | struct sit_net { |
3a43be3c ED |
81 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
82 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
83 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
84 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
85 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 86 | |
cd3dbc19 | 87 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
88 | }; |
89 | ||
4543c10d ED |
90 | /* |
91 | * Must be invoked with rcu_read_lock | |
92 | */ | |
3e866703 | 93 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 94 | struct net_device *dev, __be32 remote, __be32 local) |
1da177e4 | 95 | { |
3a43be3c ED |
96 | unsigned int h0 = HASH(remote); |
97 | unsigned int h1 = HASH(local); | |
1da177e4 | 98 | struct ip_tunnel *t; |
29182176 | 99 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 100 | |
e086cadc | 101 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 102 | if (local == t->parms.iph.saddr && |
4fddbf5d | 103 | remote == t->parms.iph.daddr && |
f2c58cc4 | 104 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && |
4fddbf5d | 105 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
106 | return t; |
107 | } | |
e086cadc | 108 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d | 109 | if (remote == t->parms.iph.daddr && |
f2c58cc4 | 110 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && |
4fddbf5d | 111 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
112 | return t; |
113 | } | |
e086cadc | 114 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d | 115 | if (local == t->parms.iph.saddr && |
f2c58cc4 | 116 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && |
4fddbf5d | 117 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
118 | return t; |
119 | } | |
4543c10d | 120 | t = rcu_dereference(sitn->tunnels_wc[0]); |
4fddbf5d | 121 | if ((t != NULL) && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
122 | return t; |
123 | return NULL; | |
124 | } | |
125 | ||
3a43be3c | 126 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 127 | struct ip_tunnel_parm *parms) |
1da177e4 | 128 | { |
420fe234 YH |
129 | __be32 remote = parms->iph.daddr; |
130 | __be32 local = parms->iph.saddr; | |
3a43be3c | 131 | unsigned int h = 0; |
1da177e4 LT |
132 | int prio = 0; |
133 | ||
134 | if (remote) { | |
135 | prio |= 2; | |
136 | h ^= HASH(remote); | |
137 | } | |
138 | if (local) { | |
139 | prio |= 1; | |
140 | h ^= HASH(local); | |
141 | } | |
29182176 | 142 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
143 | } |
144 | ||
3a43be3c | 145 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 146 | struct ip_tunnel *t) |
420fe234 | 147 | { |
ca8def14 | 148 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
149 | } |
150 | ||
ca8def14 | 151 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 152 | { |
3a43be3c ED |
153 | struct ip_tunnel __rcu **tp; |
154 | struct ip_tunnel *iter; | |
155 | ||
156 | for (tp = ipip6_bucket(sitn, t); | |
157 | (iter = rtnl_dereference(*tp)) != NULL; | |
158 | tp = &iter->next) { | |
159 | if (t == iter) { | |
cf778b00 | 160 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
161 | break; |
162 | } | |
163 | } | |
164 | } | |
165 | ||
ca8def14 | 166 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 167 | { |
3a43be3c | 168 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 169 | |
cf778b00 ED |
170 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
171 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
172 | } |
173 | ||
e0c93948 | 174 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
175 | { |
176 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
177 | struct ip_tunnel *t = netdev_priv(dev); |
178 | ||
fa857afc YH |
179 | if (t->dev == sitn->fb_tunnel_dev) { |
180 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
181 | t->ip6rd.relay_prefix = 0; | |
182 | t->ip6rd.prefixlen = 16; | |
183 | t->ip6rd.relay_prefixlen = 0; | |
184 | } else { | |
185 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
186 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
187 | } | |
188 | #endif | |
189 | } | |
190 | ||
f3723416 ND |
191 | static int ipip6_tunnel_create(struct net_device *dev) |
192 | { | |
193 | struct ip_tunnel *t = netdev_priv(dev); | |
194 | struct net *net = dev_net(dev); | |
195 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
196 | int err; | |
197 | ||
198 | err = ipip6_tunnel_init(dev); | |
199 | if (err < 0) | |
200 | goto out; | |
201 | ipip6_tunnel_clone_6rd(dev, sitn); | |
202 | ||
d440b720 | 203 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
204 | dev->priv_flags |= IFF_ISATAP; |
205 | ||
206 | err = register_netdevice(dev); | |
207 | if (err < 0) | |
208 | goto out; | |
209 | ||
210 | strcpy(t->parms.name, dev->name); | |
211 | dev->rtnl_link_ops = &sit_link_ops; | |
212 | ||
213 | dev_hold(dev); | |
214 | ||
215 | ipip6_tunnel_link(sitn, t); | |
216 | return 0; | |
217 | ||
218 | out: | |
219 | return err; | |
220 | } | |
221 | ||
3a43be3c | 222 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 223 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 224 | { |
e69a4adc AV |
225 | __be32 remote = parms->iph.daddr; |
226 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
227 | struct ip_tunnel *t, *nt; |
228 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 229 | struct net_device *dev; |
1da177e4 | 230 | char name[IFNAMSIZ]; |
ca8def14 | 231 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 232 | |
3a43be3c ED |
233 | for (tp = __ipip6_bucket(sitn, parms); |
234 | (t = rtnl_dereference(*tp)) != NULL; | |
235 | tp = &t->next) { | |
8db99e57 | 236 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
237 | remote == t->parms.iph.daddr && |
238 | parms->link == t->parms.link) { | |
8db99e57 SH |
239 | if (create) |
240 | return NULL; | |
241 | else | |
242 | return t; | |
243 | } | |
1da177e4 LT |
244 | } |
245 | if (!create) | |
246 | goto failed; | |
247 | ||
248 | if (parms->name[0]) | |
249 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 250 | else |
15fc1f70 | 251 | strcpy(name, "sit%d"); |
1da177e4 LT |
252 | |
253 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
254 | if (dev == NULL) | |
255 | return NULL; | |
256 | ||
7a97146c PE |
257 | dev_net_set(dev, net); |
258 | ||
2941a486 | 259 | nt = netdev_priv(dev); |
1326c3d5 | 260 | |
1da177e4 | 261 | nt->parms = *parms; |
f3723416 | 262 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 263 | goto failed_free; |
1da177e4 | 264 | |
1da177e4 LT |
265 | return nt; |
266 | ||
b37d428b | 267 | failed_free: |
15fc1f70 | 268 | ipip6_dev_free(dev); |
1da177e4 LT |
269 | failed: |
270 | return NULL; | |
271 | } | |
272 | ||
ef9a9d11 ED |
273 | #define for_each_prl_rcu(start) \ |
274 | for (prl = rcu_dereference(start); \ | |
275 | prl; \ | |
276 | prl = rcu_dereference(prl->next)) | |
277 | ||
fadf6bf0 | 278 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 279 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 280 | { |
ef9a9d11 | 281 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 282 | |
ef9a9d11 ED |
283 | for_each_prl_rcu(t->prl) |
284 | if (prl->addr == addr) | |
fadf6bf0 | 285 | break; |
ef9a9d11 | 286 | return prl; |
fadf6bf0 TF |
287 | |
288 | } | |
289 | ||
2b4743bd YH |
290 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
291 | struct ip_tunnel_prl __user *a) | |
300aaeea | 292 | { |
2b4743bd | 293 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
294 | struct ip_tunnel_prl_entry *prl; |
295 | unsigned int cmax, c = 0, ca, len; | |
296 | int ret = 0; | |
297 | ||
2b4743bd YH |
298 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
299 | return -EFAULT; | |
300 | cmax = kprl.datalen / sizeof(kprl); | |
301 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
302 | cmax = 1; |
303 | ||
304 | /* For simple GET or for root users, | |
305 | * we try harder to allocate. | |
306 | */ | |
307 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
308 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
309 | NULL; | |
310 | ||
ef9a9d11 | 311 | rcu_read_lock(); |
300aaeea YH |
312 | |
313 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
314 | ||
315 | if (!kp) { | |
316 | /* We don't try hard to allocate much memory for | |
317 | * non-root users. | |
318 | * For root users, retry allocating enough memory for | |
319 | * the answer. | |
320 | */ | |
321 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
322 | if (!kp) { | |
323 | ret = -ENOMEM; | |
324 | goto out; | |
325 | } | |
326 | } | |
327 | ||
328 | c = 0; | |
ef9a9d11 | 329 | for_each_prl_rcu(t->prl) { |
298bf12d | 330 | if (c >= cmax) |
300aaeea | 331 | break; |
2b4743bd | 332 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
333 | continue; |
334 | kp[c].addr = prl->addr; | |
335 | kp[c].flags = prl->flags; | |
336 | c++; | |
2b4743bd | 337 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
338 | break; |
339 | } | |
340 | out: | |
ef9a9d11 | 341 | rcu_read_unlock(); |
300aaeea YH |
342 | |
343 | len = sizeof(*kp) * c; | |
2b4743bd YH |
344 | ret = 0; |
345 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
346 | ret = -EFAULT; | |
300aaeea YH |
347 | |
348 | kfree(kp); | |
300aaeea | 349 | |
2b4743bd | 350 | return ret; |
300aaeea YH |
351 | } |
352 | ||
fadf6bf0 TF |
353 | static int |
354 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
355 | { | |
356 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
357 | int err = 0; |
358 | ||
0009ae1f YH |
359 | if (a->addr == htonl(INADDR_ANY)) |
360 | return -EINVAL; | |
361 | ||
aac4dddc | 362 | ASSERT_RTNL(); |
fadf6bf0 | 363 | |
3a43be3c | 364 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 365 | if (p->addr == a->addr) { |
ef9a9d11 ED |
366 | if (chg) { |
367 | p->flags = a->flags; | |
368 | goto out; | |
369 | } | |
3fcfa129 YH |
370 | err = -EEXIST; |
371 | goto out; | |
fadf6bf0 TF |
372 | } |
373 | } | |
374 | ||
3fcfa129 YH |
375 | if (chg) { |
376 | err = -ENXIO; | |
377 | goto out; | |
378 | } | |
fadf6bf0 TF |
379 | |
380 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
381 | if (!p) { |
382 | err = -ENOBUFS; | |
383 | goto out; | |
384 | } | |
fadf6bf0 | 385 | |
fadf6bf0 | 386 | p->next = t->prl; |
300aaeea YH |
387 | p->addr = a->addr; |
388 | p->flags = a->flags; | |
ef9a9d11 | 389 | t->prl_count++; |
cf778b00 | 390 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 391 | out: |
3fcfa129 | 392 | return err; |
fadf6bf0 TF |
393 | } |
394 | ||
ef9a9d11 ED |
395 | static void prl_list_destroy_rcu(struct rcu_head *head) |
396 | { | |
397 | struct ip_tunnel_prl_entry *p, *n; | |
398 | ||
399 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
400 | do { | |
753ea8e9 | 401 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
402 | kfree(p); |
403 | p = n; | |
404 | } while (p); | |
405 | } | |
406 | ||
fadf6bf0 TF |
407 | static int |
408 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
409 | { | |
753ea8e9 ED |
410 | struct ip_tunnel_prl_entry *x; |
411 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
412 | int err = 0; |
413 | ||
aac4dddc | 414 | ASSERT_RTNL(); |
fadf6bf0 | 415 | |
0009ae1f | 416 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
417 | for (p = &t->prl; |
418 | (x = rtnl_dereference(*p)) != NULL; | |
419 | p = &x->next) { | |
420 | if (x->addr == a->addr) { | |
fadf6bf0 | 421 | *p = x->next; |
11c476f3 | 422 | kfree_rcu(x, rcu_head); |
300aaeea | 423 | t->prl_count--; |
3fcfa129 | 424 | goto out; |
fadf6bf0 TF |
425 | } |
426 | } | |
3fcfa129 | 427 | err = -ENXIO; |
fadf6bf0 | 428 | } else { |
753ea8e9 ED |
429 | x = rtnl_dereference(t->prl); |
430 | if (x) { | |
ef9a9d11 | 431 | t->prl_count = 0; |
ef9a9d11 ED |
432 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
433 | t->prl = NULL; | |
fadf6bf0 TF |
434 | } |
435 | } | |
3fcfa129 | 436 | out: |
4b279601 | 437 | return err; |
fadf6bf0 TF |
438 | } |
439 | ||
fadf6bf0 | 440 | static int |
b71d1d42 | 441 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 442 | { |
3fcfa129 | 443 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
444 | int ok = 1; |
445 | ||
ef9a9d11 | 446 | rcu_read_lock(); |
3fcfa129 | 447 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 448 | if (p) { |
300aaeea | 449 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
450 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
451 | else | |
452 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
453 | } else { | |
b71d1d42 ED |
454 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
455 | ||
fadf6bf0 TF |
456 | if (ipv6_addr_is_isatap(addr6) && |
457 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 458 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
459 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
460 | else | |
461 | ok = 0; | |
462 | } | |
ef9a9d11 | 463 | rcu_read_unlock(); |
fadf6bf0 TF |
464 | return ok; |
465 | } | |
466 | ||
1da177e4 LT |
467 | static void ipip6_tunnel_uninit(struct net_device *dev) |
468 | { | |
ca8def14 PE |
469 | struct net *net = dev_net(dev); |
470 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
471 | ||
cd3dbc19 | 472 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 473 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 474 | } else { |
ca8def14 | 475 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 476 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 | 477 | } |
3a43be3c | 478 | dev_put(dev); |
1da177e4 LT |
479 | } |
480 | ||
481 | ||
c73cb5a2 | 482 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 483 | { |
1da177e4 | 484 | |
071f92d0 | 485 | /* All the routers (except for Linux) return only |
1da177e4 LT |
486 | 8 bytes of packet payload. It means, that precise relaying of |
487 | ICMP in the real Internet is absolutely infeasible. | |
488 | */ | |
b71d1d42 | 489 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
490 | const int type = icmp_hdr(skb)->type; |
491 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 492 | struct ip_tunnel *t; |
c73cb5a2 | 493 | int err; |
1da177e4 LT |
494 | |
495 | switch (type) { | |
496 | default: | |
497 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 498 | return 0; |
1da177e4 LT |
499 | |
500 | case ICMP_DEST_UNREACH: | |
501 | switch (code) { | |
502 | case ICMP_SR_FAILED: | |
503 | case ICMP_PORT_UNREACH: | |
504 | /* Impossible event. */ | |
c73cb5a2 | 505 | return 0; |
1da177e4 LT |
506 | default: |
507 | /* All others are translated to HOST_UNREACH. | |
508 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
509 | I believe they are just ether pollution. --ANK | |
510 | */ | |
511 | break; | |
512 | } | |
513 | break; | |
514 | case ICMP_TIME_EXCEEDED: | |
515 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 516 | return 0; |
1da177e4 | 517 | break; |
ec18d9a2 DM |
518 | case ICMP_REDIRECT: |
519 | break; | |
1da177e4 LT |
520 | } |
521 | ||
c73cb5a2 KM |
522 | err = -ENOENT; |
523 | ||
4fddbf5d SH |
524 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
525 | skb->dev, | |
526 | iph->daddr, | |
527 | iph->saddr); | |
36393395 DM |
528 | if (t == NULL) |
529 | goto out; | |
530 | ||
531 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
532 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d09f7f9a | 533 | t->parms.link, 0, iph->protocol, 0); |
36393395 DM |
534 | err = 0; |
535 | goto out; | |
536 | } | |
ec18d9a2 | 537 | if (type == ICMP_REDIRECT) { |
c581207e | 538 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, |
d09f7f9a | 539 | iph->protocol, 0); |
ec18d9a2 DM |
540 | err = 0; |
541 | goto out; | |
542 | } | |
36393395 DM |
543 | |
544 | if (t->parms.iph.daddr == 0) | |
1da177e4 | 545 | goto out; |
c73cb5a2 KM |
546 | |
547 | err = 0; | |
1da177e4 LT |
548 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
549 | goto out; | |
550 | ||
bb80087a | 551 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
552 | t->err_count++; |
553 | else | |
554 | t->err_count = 1; | |
555 | t->err_time = jiffies; | |
556 | out: | |
c73cb5a2 | 557 | return err; |
1da177e4 LT |
558 | } |
559 | ||
218774dc HFS |
560 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
561 | const struct in6_addr *v6addr) | |
562 | { | |
563 | __be32 v4embed = 0; | |
564 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
565 | return true; | |
566 | return false; | |
567 | } | |
568 | ||
6ea2edb3 CB |
569 | /* Checks if an address matches an address on the tunnel interface. |
570 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
571 | * Long story: | |
572 | * This function is called after we considered the packet as spoofed | |
573 | * in is_spoofed_6rd. | |
574 | * We may have a router that is doing NAT for proto 41 packets | |
575 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
576 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
577 | * function will return true, dropping the packet. | |
578 | * But, we can still check if is spoofed against the IP | |
579 | * addresses associated with the interface. | |
580 | */ | |
581 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
582 | const struct in6_addr *v6dst) | |
583 | { | |
584 | int prefix_len; | |
585 | ||
586 | #ifdef CONFIG_IPV6_SIT_6RD | |
587 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
588 | - tunnel->ip6rd.relay_prefixlen; | |
589 | #else | |
590 | prefix_len = 48; | |
591 | #endif | |
592 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
593 | } | |
594 | ||
595 | /* Returns true if a packet is spoofed */ | |
596 | static bool packet_is_spoofed(struct sk_buff *skb, | |
597 | const struct iphdr *iph, | |
598 | struct ip_tunnel *tunnel) | |
599 | { | |
600 | const struct ipv6hdr *ipv6h; | |
601 | ||
602 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
603 | if (!isatap_chksrc(skb, iph, tunnel)) | |
604 | return true; | |
605 | ||
606 | return false; | |
607 | } | |
608 | ||
609 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
610 | return false; | |
611 | ||
612 | ipv6h = ipv6_hdr(skb); | |
613 | ||
614 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
615 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
616 | &iph->saddr, &ipv6h->saddr, | |
617 | &iph->daddr, &ipv6h->daddr); | |
618 | return true; | |
619 | } | |
620 | ||
621 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
622 | return false; | |
623 | ||
624 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
625 | return false; | |
626 | ||
627 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
628 | &iph->saddr, &ipv6h->saddr, | |
629 | &iph->daddr, &ipv6h->daddr); | |
630 | return true; | |
631 | } | |
632 | ||
1da177e4 LT |
633 | static int ipip6_rcv(struct sk_buff *skb) |
634 | { | |
1ad759d8 | 635 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 636 | struct ip_tunnel *tunnel; |
f4e0b4c5 | 637 | int err; |
1da177e4 | 638 | |
4fddbf5d SH |
639 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
640 | iph->saddr, iph->daddr); | |
641 | if (tunnel != NULL) { | |
15fc1f70 ED |
642 | struct pcpu_tstats *tstats; |
643 | ||
1da177e4 | 644 | secpath_reset(skb); |
b0e380b1 | 645 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 646 | skb_reset_network_header(skb); |
8cdfab8a | 647 | IPCB(skb)->flags = 0; |
1da177e4 LT |
648 | skb->protocol = htons(ETH_P_IPV6); |
649 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 | 650 | |
6ea2edb3 CB |
651 | if (packet_is_spoofed(skb, iph, tunnel)) { |
652 | tunnel->dev->stats.rx_errors++; | |
653 | goto out; | |
f4e0b4c5 ND |
654 | } |
655 | ||
656 | __skb_tunnel_rx(skb, tunnel->dev); | |
657 | ||
658 | err = IP_ECN_decapsulate(iph, skb); | |
659 | if (unlikely(err)) { | |
660 | if (log_ecn_error) | |
661 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
662 | &iph->saddr, iph->tos); | |
663 | if (err > 1) { | |
664 | ++tunnel->dev->stats.rx_frame_errors; | |
665 | ++tunnel->dev->stats.rx_errors; | |
666 | goto out; | |
667 | } | |
c7dc89c0 | 668 | } |
d19d56dd | 669 | |
15fc1f70 ED |
670 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
671 | tstats->rx_packets++; | |
672 | tstats->rx_bytes += skb->len; | |
673 | ||
caf586e5 | 674 | netif_rx(skb); |
8990f468 | 675 | |
1da177e4 LT |
676 | return 0; |
677 | } | |
678 | ||
6dcdd1b3 | 679 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 680 | return 1; |
1da177e4 | 681 | out: |
36ca34cc | 682 | kfree_skb(skb); |
1da177e4 LT |
683 | return 0; |
684 | } | |
685 | ||
fa857afc | 686 | /* |
218774dc HFS |
687 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
688 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 689 | */ |
218774dc HFS |
690 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
691 | __be32 *v4dst) | |
1da177e4 | 692 | { |
fa857afc YH |
693 | #ifdef CONFIG_IPV6_SIT_6RD |
694 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
695 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 696 | unsigned int pbw0, pbi0; |
fa857afc YH |
697 | int pbi1; |
698 | u32 d; | |
699 | ||
700 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
701 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
702 | ||
e7db38c3 | 703 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
704 | tunnel->ip6rd.relay_prefixlen; |
705 | ||
706 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
707 | if (pbi1 > 0) | |
e7db38c3 | 708 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
709 | (32 - pbi1); |
710 | ||
218774dc HFS |
711 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
712 | return true; | |
fa857afc YH |
713 | } |
714 | #else | |
1da177e4 | 715 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 716 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
717 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
718 | return true; | |
1da177e4 | 719 | } |
fa857afc | 720 | #endif |
218774dc HFS |
721 | return false; |
722 | } | |
723 | ||
724 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
725 | const struct in6_addr *v6dst) | |
726 | { | |
727 | __be32 dst = 0; | |
728 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
729 | return dst; |
730 | } | |
731 | ||
732 | /* | |
733 | * This function assumes it is being called from dev_queue_xmit() | |
734 | * and that skb is filled properly by that function. | |
735 | */ | |
736 | ||
6fef4c0c SH |
737 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
738 | struct net_device *dev) | |
1da177e4 | 739 | { |
2941a486 | 740 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
741 | const struct iphdr *tiph = &tunnel->parms.iph; |
742 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 743 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 744 | __be16 df = tiph->frag_off; |
1da177e4 | 745 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 746 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 747 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 748 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 749 | __be32 dst = tiph->daddr; |
31e4543d | 750 | struct flowi4 fl4; |
1da177e4 | 751 | int mtu; |
b71d1d42 | 752 | const struct in6_addr *addr6; |
1da177e4 LT |
753 | int addr_type; |
754 | ||
1da177e4 LT |
755 | if (skb->protocol != htons(ETH_P_IPV6)) |
756 | goto tx_error; | |
757 | ||
c2bceb3d LEM |
758 | if (tos == 1) |
759 | tos = ipv6_get_dsfield(iph6); | |
760 | ||
c7dc89c0 FT |
761 | /* ISATAP (RFC4214) - must come before 6to4 */ |
762 | if (dev->priv_flags & IFF_ISATAP) { | |
763 | struct neighbour *neigh = NULL; | |
1e2927b0 | 764 | bool do_tx_error = false; |
c7dc89c0 | 765 | |
adf30907 | 766 | if (skb_dst(skb)) |
1e2927b0 | 767 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
768 | |
769 | if (neigh == NULL) { | |
6ea2edb3 | 770 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
771 | goto tx_error; |
772 | } | |
773 | ||
3e866703 | 774 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
775 | addr_type = ipv6_addr_type(addr6); |
776 | ||
777 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
778 | ipv6_addr_is_isatap(addr6)) | |
779 | dst = addr6->s6_addr32[3]; | |
780 | else | |
1e2927b0 DM |
781 | do_tx_error = true; |
782 | ||
783 | neigh_release(neigh); | |
784 | if (do_tx_error) | |
c7dc89c0 FT |
785 | goto tx_error; |
786 | } | |
787 | ||
1da177e4 | 788 | if (!dst) |
218774dc | 789 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
790 | |
791 | if (!dst) { | |
792 | struct neighbour *neigh = NULL; | |
1e2927b0 | 793 | bool do_tx_error = false; |
1da177e4 | 794 | |
adf30907 | 795 | if (skb_dst(skb)) |
1e2927b0 | 796 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
797 | |
798 | if (neigh == NULL) { | |
6ea2edb3 | 799 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
800 | goto tx_error; |
801 | } | |
802 | ||
3e866703 | 803 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
804 | addr_type = ipv6_addr_type(addr6); |
805 | ||
806 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 807 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
808 | addr_type = ipv6_addr_type(addr6); |
809 | } | |
810 | ||
1e2927b0 DM |
811 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
812 | dst = addr6->s6_addr32[3]; | |
813 | else | |
814 | do_tx_error = true; | |
1da177e4 | 815 | |
1e2927b0 DM |
816 | neigh_release(neigh); |
817 | if (do_tx_error) | |
818 | goto tx_error; | |
1da177e4 LT |
819 | } |
820 | ||
31e4543d | 821 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
822 | dst, tiph->saddr, |
823 | 0, 0, | |
824 | IPPROTO_IPV6, RT_TOS(tos), | |
825 | tunnel->parms.link); | |
826 | if (IS_ERR(rt)) { | |
827 | dev->stats.tx_carrier_errors++; | |
828 | goto tx_error_icmp; | |
1da177e4 LT |
829 | } |
830 | if (rt->rt_type != RTN_UNICAST) { | |
831 | ip_rt_put(rt); | |
15fc1f70 | 832 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
833 | goto tx_error_icmp; |
834 | } | |
d8d1f30b | 835 | tdev = rt->dst.dev; |
1da177e4 LT |
836 | |
837 | if (tdev == dev) { | |
838 | ip_rt_put(rt); | |
15fc1f70 | 839 | dev->stats.collisions++; |
1da177e4 LT |
840 | goto tx_error; |
841 | } | |
842 | ||
292f4f3c | 843 | if (df) { |
d8d1f30b | 844 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 845 | |
292f4f3c | 846 | if (mtu < 68) { |
15fc1f70 | 847 | dev->stats.collisions++; |
292f4f3c HX |
848 | ip_rt_put(rt); |
849 | goto tx_error; | |
850 | } | |
1da177e4 | 851 | |
292f4f3c HX |
852 | if (mtu < IPV6_MIN_MTU) { |
853 | mtu = IPV6_MIN_MTU; | |
854 | df = 0; | |
855 | } | |
856 | ||
857 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 858 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c HX |
859 | |
860 | if (skb->len > mtu) { | |
3ffe533c | 861 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
862 | ip_rt_put(rt); |
863 | goto tx_error; | |
864 | } | |
1da177e4 LT |
865 | } |
866 | ||
867 | if (tunnel->err_count > 0) { | |
bb80087a WY |
868 | if (time_before(jiffies, |
869 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
870 | tunnel->err_count--; |
871 | dst_link_failure(skb); | |
872 | } else | |
873 | tunnel->err_count = 0; | |
874 | } | |
875 | ||
876 | /* | |
877 | * Okay, now see if we can stuff it in the buffer as-is. | |
878 | */ | |
879 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
880 | ||
cfbba49d PM |
881 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
882 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
883 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
884 | if (!new_skb) { | |
885 | ip_rt_put(rt); | |
15fc1f70 | 886 | dev->stats.tx_dropped++; |
1da177e4 | 887 | dev_kfree_skb(skb); |
6ed10654 | 888 | return NETDEV_TX_OK; |
1da177e4 LT |
889 | } |
890 | if (skb->sk) | |
891 | skb_set_owner_w(new_skb, skb->sk); | |
892 | dev_kfree_skb(skb); | |
893 | skb = new_skb; | |
0660e03f | 894 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
895 | } |
896 | ||
b0e380b1 | 897 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
898 | skb_push(skb, sizeof(struct iphdr)); |
899 | skb_reset_network_header(skb); | |
1da177e4 | 900 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 901 | IPCB(skb)->flags = 0; |
adf30907 | 902 | skb_dst_drop(skb); |
d8d1f30b | 903 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
904 | |
905 | /* | |
906 | * Push down and install the IPIP header. | |
907 | */ | |
908 | ||
eddc9ec5 | 909 | iph = ip_hdr(skb); |
1da177e4 LT |
910 | iph->version = 4; |
911 | iph->ihl = sizeof(struct iphdr)>>2; | |
292f4f3c | 912 | iph->frag_off = df; |
1da177e4 LT |
913 | iph->protocol = IPPROTO_IPV6; |
914 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
301102cc DM |
915 | iph->daddr = fl4.daddr; |
916 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
917 | |
918 | if ((iph->ttl = tiph->ttl) == 0) | |
919 | iph->ttl = iph6->hop_limit; | |
920 | ||
6aed0c8b | 921 | skb->ip_summed = CHECKSUM_NONE; |
ff1f69a8 | 922 | ip_select_ident(skb, NULL); |
aa0010f8 | 923 | iptunnel_xmit(skb, dev); |
6ed10654 | 924 | return NETDEV_TX_OK; |
1da177e4 LT |
925 | |
926 | tx_error_icmp: | |
927 | dst_link_failure(skb); | |
928 | tx_error: | |
15fc1f70 | 929 | dev->stats.tx_errors++; |
1da177e4 | 930 | dev_kfree_skb(skb); |
6ed10654 | 931 | return NETDEV_TX_OK; |
1da177e4 LT |
932 | } |
933 | ||
8a4a50f9 MS |
934 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
935 | { | |
936 | struct net_device *tdev = NULL; | |
937 | struct ip_tunnel *tunnel; | |
b71d1d42 | 938 | const struct iphdr *iph; |
31e4543d | 939 | struct flowi4 fl4; |
8a4a50f9 MS |
940 | |
941 | tunnel = netdev_priv(dev); | |
942 | iph = &tunnel->parms.iph; | |
943 | ||
944 | if (iph->daddr) { | |
31e4543d | 945 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, |
78fbfd8a DM |
946 | iph->daddr, iph->saddr, |
947 | 0, 0, | |
948 | IPPROTO_IPV6, | |
949 | RT_TOS(iph->tos), | |
950 | tunnel->parms.link); | |
b23dd4fe DM |
951 | |
952 | if (!IS_ERR(rt)) { | |
d8d1f30b | 953 | tdev = rt->dst.dev; |
8a4a50f9 MS |
954 | ip_rt_put(rt); |
955 | } | |
956 | dev->flags |= IFF_POINTOPOINT; | |
957 | } | |
958 | ||
959 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 960 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
961 | |
962 | if (tdev) { | |
963 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
964 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
965 | if (dev->mtu < IPV6_MIN_MTU) | |
966 | dev->mtu = IPV6_MIN_MTU; | |
967 | } | |
968 | dev->iflink = tunnel->parms.link; | |
969 | } | |
970 | ||
f3723416 ND |
971 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) |
972 | { | |
973 | struct net *net = dev_net(t->dev); | |
974 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
975 | ||
976 | ipip6_tunnel_unlink(sitn, t); | |
977 | synchronize_net(); | |
978 | t->parms.iph.saddr = p->iph.saddr; | |
979 | t->parms.iph.daddr = p->iph.daddr; | |
980 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
981 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
982 | ipip6_tunnel_link(sitn, t); | |
983 | t->parms.iph.ttl = p->iph.ttl; | |
984 | t->parms.iph.tos = p->iph.tos; | |
985 | if (t->parms.link != p->link) { | |
986 | t->parms.link = p->link; | |
987 | ipip6_tunnel_bind_dev(t->dev); | |
988 | } | |
989 | netdev_state_change(t->dev); | |
990 | } | |
991 | ||
e2f1f072 ND |
992 | #ifdef CONFIG_IPV6_SIT_6RD |
993 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
994 | struct ip_tunnel_6rd *ip6rd) | |
995 | { | |
996 | struct in6_addr prefix; | |
997 | __be32 relay_prefix; | |
998 | ||
999 | if (ip6rd->relay_prefixlen > 32 || | |
1000 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1001 | return -EINVAL; | |
1002 | ||
1003 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1004 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1005 | return -EINVAL; | |
1006 | if (ip6rd->relay_prefixlen) | |
1007 | relay_prefix = ip6rd->relay_prefix & | |
1008 | htonl(0xffffffffUL << | |
1009 | (32 - ip6rd->relay_prefixlen)); | |
1010 | else | |
1011 | relay_prefix = 0; | |
1012 | if (relay_prefix != ip6rd->relay_prefix) | |
1013 | return -EINVAL; | |
1014 | ||
1015 | t->ip6rd.prefix = prefix; | |
1016 | t->ip6rd.relay_prefix = relay_prefix; | |
1017 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1018 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
1019 | netdev_state_change(t->dev); | |
1020 | return 0; | |
1021 | } | |
1022 | #endif | |
1023 | ||
1da177e4 LT |
1024 | static int |
1025 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
1026 | { | |
1027 | int err = 0; | |
1028 | struct ip_tunnel_parm p; | |
fadf6bf0 | 1029 | struct ip_tunnel_prl prl; |
1da177e4 | 1030 | struct ip_tunnel *t; |
ca8def14 PE |
1031 | struct net *net = dev_net(dev); |
1032 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
1033 | #ifdef CONFIG_IPV6_SIT_6RD |
1034 | struct ip_tunnel_6rd ip6rd; | |
1035 | #endif | |
1da177e4 LT |
1036 | |
1037 | switch (cmd) { | |
1038 | case SIOCGETTUNNEL: | |
fa857afc YH |
1039 | #ifdef CONFIG_IPV6_SIT_6RD |
1040 | case SIOCGET6RD: | |
1041 | #endif | |
1da177e4 | 1042 | t = NULL; |
cd3dbc19 | 1043 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1044 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1045 | err = -EFAULT; | |
1046 | break; | |
1047 | } | |
ca8def14 | 1048 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
1049 | } |
1050 | if (t == NULL) | |
2941a486 | 1051 | t = netdev_priv(dev); |
fa857afc YH |
1052 | |
1053 | err = -EFAULT; | |
1054 | if (cmd == SIOCGETTUNNEL) { | |
1055 | memcpy(&p, &t->parms, sizeof(p)); | |
1056 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1057 | sizeof(p))) | |
1058 | goto done; | |
1059 | #ifdef CONFIG_IPV6_SIT_6RD | |
1060 | } else { | |
4e3fd7a0 | 1061 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
1062 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
1063 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1064 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1065 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1066 | sizeof(ip6rd))) | |
1067 | goto done; | |
1068 | #endif | |
1069 | } | |
1070 | err = 0; | |
1da177e4 LT |
1071 | break; |
1072 | ||
1073 | case SIOCADDTUNNEL: | |
1074 | case SIOCCHGTUNNEL: | |
1075 | err = -EPERM; | |
af31f412 | 1076 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1077 | goto done; |
1078 | ||
1079 | err = -EFAULT; | |
1080 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1081 | goto done; | |
1082 | ||
1083 | err = -EINVAL; | |
1084 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
1085 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
1086 | goto done; | |
1087 | if (p.iph.ttl) | |
1088 | p.iph.frag_off |= htons(IP_DF); | |
1089 | ||
ca8def14 | 1090 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1091 | |
cd3dbc19 | 1092 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1093 | if (t != NULL) { |
1094 | if (t->dev != dev) { | |
1095 | err = -EEXIST; | |
1096 | break; | |
1097 | } | |
1098 | } else { | |
1099 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1100 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1101 | err = -EINVAL; | |
1102 | break; | |
1103 | } | |
2941a486 | 1104 | t = netdev_priv(dev); |
1da177e4 | 1105 | } |
f9cd5a55 | 1106 | |
f3723416 | 1107 | ipip6_tunnel_update(t, &p); |
1da177e4 LT |
1108 | } |
1109 | ||
1110 | if (t) { | |
1111 | err = 0; | |
1da177e4 LT |
1112 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1113 | err = -EFAULT; | |
1114 | } else | |
1115 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1116 | break; | |
1117 | ||
1118 | case SIOCDELTUNNEL: | |
1119 | err = -EPERM; | |
af31f412 | 1120 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1121 | goto done; |
1122 | ||
cd3dbc19 | 1123 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1124 | err = -EFAULT; |
1125 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1126 | goto done; | |
1127 | err = -ENOENT; | |
ca8def14 | 1128 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1129 | goto done; |
1130 | err = -EPERM; | |
cd3dbc19 | 1131 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1132 | goto done; |
1133 | dev = t->dev; | |
1134 | } | |
22f8cde5 SH |
1135 | unregister_netdevice(dev); |
1136 | err = 0; | |
1da177e4 LT |
1137 | break; |
1138 | ||
300aaeea | 1139 | case SIOCGETPRL: |
2b4743bd YH |
1140 | err = -EINVAL; |
1141 | if (dev == sitn->fb_tunnel_dev) | |
1142 | goto done; | |
1143 | err = -ENOENT; | |
1144 | if (!(t = netdev_priv(dev))) | |
1145 | goto done; | |
1146 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1147 | break; | |
1148 | ||
fadf6bf0 TF |
1149 | case SIOCADDPRL: |
1150 | case SIOCDELPRL: | |
1151 | case SIOCCHGPRL: | |
1152 | err = -EPERM; | |
af31f412 | 1153 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fadf6bf0 TF |
1154 | goto done; |
1155 | err = -EINVAL; | |
cd3dbc19 | 1156 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1157 | goto done; |
1158 | err = -EFAULT; | |
1159 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1160 | goto done; | |
1161 | err = -ENOENT; | |
1162 | if (!(t = netdev_priv(dev))) | |
1163 | goto done; | |
1164 | ||
300aaeea | 1165 | switch (cmd) { |
300aaeea | 1166 | case SIOCDELPRL: |
fadf6bf0 | 1167 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1168 | break; |
1169 | case SIOCADDPRL: | |
1170 | case SIOCCHGPRL: | |
fadf6bf0 | 1171 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1172 | break; |
1173 | } | |
2b4743bd | 1174 | netdev_state_change(dev); |
fadf6bf0 TF |
1175 | break; |
1176 | ||
fa857afc YH |
1177 | #ifdef CONFIG_IPV6_SIT_6RD |
1178 | case SIOCADD6RD: | |
1179 | case SIOCCHG6RD: | |
1180 | case SIOCDEL6RD: | |
1181 | err = -EPERM; | |
af31f412 | 1182 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fa857afc YH |
1183 | goto done; |
1184 | ||
1185 | err = -EFAULT; | |
1186 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1187 | sizeof(ip6rd))) | |
1188 | goto done; | |
1189 | ||
1190 | t = netdev_priv(dev); | |
1191 | ||
1192 | if (cmd != SIOCDEL6RD) { | |
e2f1f072 ND |
1193 | err = ipip6_tunnel_update_6rd(t, &ip6rd); |
1194 | if (err < 0) | |
fa857afc | 1195 | goto done; |
fa857afc | 1196 | } else |
e0c93948 | 1197 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1198 | |
1199 | err = 0; | |
1200 | break; | |
1201 | #endif | |
1202 | ||
1da177e4 LT |
1203 | default: |
1204 | err = -EINVAL; | |
1205 | } | |
1206 | ||
1207 | done: | |
1208 | return err; | |
1209 | } | |
1210 | ||
1da177e4 LT |
1211 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1212 | { | |
1213 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1214 | return -EINVAL; | |
1215 | dev->mtu = new_mtu; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1326c3d5 SH |
1219 | static const struct net_device_ops ipip6_netdev_ops = { |
1220 | .ndo_uninit = ipip6_tunnel_uninit, | |
1221 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1222 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1223 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
f61dd388 | 1224 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1326c3d5 SH |
1225 | }; |
1226 | ||
15fc1f70 ED |
1227 | static void ipip6_dev_free(struct net_device *dev) |
1228 | { | |
1229 | free_percpu(dev->tstats); | |
1230 | free_netdev(dev); | |
1231 | } | |
1232 | ||
1da177e4 LT |
1233 | static void ipip6_tunnel_setup(struct net_device *dev) |
1234 | { | |
1326c3d5 | 1235 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1236 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1237 | |
1238 | dev->type = ARPHRD_SIT; | |
1239 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1240 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1241 | dev->flags = IFF_NOARP; |
f2ba025b | 1242 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1243 | dev->iflink = 0; |
1244 | dev->addr_len = 4; | |
7a97146c | 1245 | dev->features |= NETIF_F_NETNS_LOCAL; |
8df40d10 | 1246 | dev->features |= NETIF_F_LLTX; |
1da177e4 LT |
1247 | } |
1248 | ||
15fc1f70 | 1249 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1250 | { |
1326c3d5 | 1251 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1252 | |
1253 | tunnel->dev = dev; | |
1da177e4 LT |
1254 | |
1255 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1256 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1257 | ||
8a4a50f9 | 1258 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1259 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1260 | if (!dev->tstats) | |
1261 | return -ENOMEM; | |
1262 | ||
1263 | return 0; | |
1da177e4 LT |
1264 | } |
1265 | ||
dd4080ee | 1266 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1267 | { |
2941a486 | 1268 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1269 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1270 | struct net *net = dev_net(dev); |
1271 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1272 | |
1273 | tunnel->dev = dev; | |
1274 | strcpy(tunnel->parms.name, dev->name); | |
1275 | ||
1276 | iph->version = 4; | |
1277 | iph->protocol = IPPROTO_IPV6; | |
1278 | iph->ihl = 5; | |
1279 | iph->ttl = 64; | |
1280 | ||
dd4080ee ED |
1281 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1282 | if (!dev->tstats) | |
1283 | return -ENOMEM; | |
1da177e4 | 1284 | dev_hold(dev); |
cf778b00 | 1285 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1286 | return 0; |
1da177e4 LT |
1287 | } |
1288 | ||
f3723416 ND |
1289 | static void ipip6_netlink_parms(struct nlattr *data[], |
1290 | struct ip_tunnel_parm *parms) | |
1291 | { | |
1292 | memset(parms, 0, sizeof(*parms)); | |
1293 | ||
1294 | parms->iph.version = 4; | |
1295 | parms->iph.protocol = IPPROTO_IPV6; | |
1296 | parms->iph.ihl = 5; | |
1297 | parms->iph.ttl = 64; | |
1298 | ||
1299 | if (!data) | |
1300 | return; | |
1301 | ||
1302 | if (data[IFLA_IPTUN_LINK]) | |
1303 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1304 | ||
1305 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1306 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1307 | |
1308 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1309 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1310 | |
1311 | if (data[IFLA_IPTUN_TTL]) { | |
1312 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1313 | if (parms->iph.ttl) | |
1314 | parms->iph.frag_off = htons(IP_DF); | |
1315 | } | |
1316 | ||
1317 | if (data[IFLA_IPTUN_TOS]) | |
1318 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1319 | ||
1320 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1321 | parms->iph.frag_off = htons(IP_DF); | |
1322 | ||
1323 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1324 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
f3723416 ND |
1325 | } |
1326 | ||
e2f1f072 ND |
1327 | #ifdef CONFIG_IPV6_SIT_6RD |
1328 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1329 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1330 | struct ip_tunnel_6rd *ip6rd) | |
1331 | { | |
1332 | bool ret = false; | |
1333 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1334 | ||
1335 | if (!data) | |
1336 | return ret; | |
1337 | ||
1338 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1339 | ret = true; | |
1340 | nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], | |
1341 | sizeof(struct in6_addr)); | |
1342 | } | |
1343 | ||
1344 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1345 | ret = true; | |
1346 | ip6rd->relay_prefix = | |
1347 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1348 | } | |
1349 | ||
1350 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1351 | ret = true; | |
1352 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1353 | } | |
1354 | ||
1355 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1356 | ret = true; | |
1357 | ip6rd->relay_prefixlen = | |
1358 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1359 | } | |
1360 | ||
1361 | return ret; | |
1362 | } | |
1363 | #endif | |
1364 | ||
f3723416 ND |
1365 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
1366 | struct nlattr *tb[], struct nlattr *data[]) | |
1367 | { | |
1368 | struct net *net = dev_net(dev); | |
1369 | struct ip_tunnel *nt; | |
e2f1f072 ND |
1370 | #ifdef CONFIG_IPV6_SIT_6RD |
1371 | struct ip_tunnel_6rd ip6rd; | |
1372 | #endif | |
1373 | int err; | |
f3723416 ND |
1374 | |
1375 | nt = netdev_priv(dev); | |
1376 | ipip6_netlink_parms(data, &nt->parms); | |
1377 | ||
1378 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1379 | return -EEXIST; | |
1380 | ||
e2f1f072 ND |
1381 | err = ipip6_tunnel_create(dev); |
1382 | if (err < 0) | |
1383 | return err; | |
1384 | ||
1385 | #ifdef CONFIG_IPV6_SIT_6RD | |
1386 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1387 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1388 | #endif | |
1389 | ||
1390 | return err; | |
f3723416 ND |
1391 | } |
1392 | ||
1393 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
1394 | struct nlattr *data[]) | |
1395 | { | |
1396 | struct ip_tunnel *t; | |
1397 | struct ip_tunnel_parm p; | |
1398 | struct net *net = dev_net(dev); | |
1399 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
e2f1f072 ND |
1400 | #ifdef CONFIG_IPV6_SIT_6RD |
1401 | struct ip_tunnel_6rd ip6rd; | |
1402 | #endif | |
f3723416 ND |
1403 | |
1404 | if (dev == sitn->fb_tunnel_dev) | |
1405 | return -EINVAL; | |
1406 | ||
1407 | ipip6_netlink_parms(data, &p); | |
1408 | ||
1409 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1410 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1411 | return -EINVAL; | |
1412 | ||
1413 | t = ipip6_tunnel_locate(net, &p, 0); | |
1414 | ||
1415 | if (t) { | |
1416 | if (t->dev != dev) | |
1417 | return -EEXIST; | |
1418 | } else | |
1419 | t = netdev_priv(dev); | |
1420 | ||
1421 | ipip6_tunnel_update(t, &p); | |
e2f1f072 ND |
1422 | |
1423 | #ifdef CONFIG_IPV6_SIT_6RD | |
1424 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1425 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1426 | #endif | |
1427 | ||
f3723416 ND |
1428 | return 0; |
1429 | } | |
1430 | ||
e4c94a9c | 1431 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1432 | { |
1433 | return | |
1434 | /* IFLA_IPTUN_LINK */ | |
1435 | nla_total_size(4) + | |
1436 | /* IFLA_IPTUN_LOCAL */ | |
1437 | nla_total_size(4) + | |
1438 | /* IFLA_IPTUN_REMOTE */ | |
1439 | nla_total_size(4) + | |
1440 | /* IFLA_IPTUN_TTL */ | |
1441 | nla_total_size(1) + | |
1442 | /* IFLA_IPTUN_TOS */ | |
1443 | nla_total_size(1) + | |
a12c9a85 ND |
1444 | /* IFLA_IPTUN_PMTUDISC */ |
1445 | nla_total_size(1) + | |
1446 | /* IFLA_IPTUN_FLAGS */ | |
1447 | nla_total_size(2) + | |
e2f1f072 ND |
1448 | #ifdef CONFIG_IPV6_SIT_6RD |
1449 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1450 | nla_total_size(sizeof(struct in6_addr)) + | |
1451 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1452 | nla_total_size(4) + | |
1453 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1454 | nla_total_size(2) + | |
1455 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1456 | nla_total_size(2) + | |
1457 | #endif | |
ba3e3f50 ND |
1458 | 0; |
1459 | } | |
1460 | ||
e4c94a9c | 1461 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1462 | { |
1463 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1464 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1465 | ||
1466 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1467 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1468 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1469 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
a12c9a85 ND |
1470 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1471 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1472 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
d440b720 | 1473 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) |
ba3e3f50 | 1474 | goto nla_put_failure; |
e2f1f072 ND |
1475 | |
1476 | #ifdef CONFIG_IPV6_SIT_6RD | |
1477 | if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), | |
1478 | &tunnel->ip6rd.prefix) || | |
1479 | nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1480 | tunnel->ip6rd.relay_prefix) || | |
1481 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, | |
1482 | tunnel->ip6rd.prefixlen) || | |
1483 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1484 | tunnel->ip6rd.relay_prefixlen)) | |
1485 | goto nla_put_failure; | |
1486 | #endif | |
1487 | ||
ba3e3f50 ND |
1488 | return 0; |
1489 | ||
1490 | nla_put_failure: | |
1491 | return -EMSGSIZE; | |
1492 | } | |
1493 | ||
f3723416 ND |
1494 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1495 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1496 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1497 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1498 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1499 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1500 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1501 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
e2f1f072 ND |
1502 | #ifdef CONFIG_IPV6_SIT_6RD |
1503 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1504 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1505 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1506 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1507 | #endif | |
f3723416 ND |
1508 | }; |
1509 | ||
1b2a58ff ND |
1510 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1511 | { | |
1512 | struct net *net = dev_net(dev); | |
1513 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1514 | ||
1515 | if (dev != sitn->fb_tunnel_dev) | |
1516 | unregister_netdevice_queue(dev, head); | |
1517 | } | |
1518 | ||
ba3e3f50 ND |
1519 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1520 | .kind = "sit", | |
1521 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1522 | .policy = ipip6_policy, |
ba3e3f50 | 1523 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 ND |
1524 | .setup = ipip6_tunnel_setup, |
1525 | .newlink = ipip6_newlink, | |
1526 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1527 | .get_size = ipip6_get_size, |
1528 | .fill_info = ipip6_fill_info, | |
1b2a58ff | 1529 | .dellink = ipip6_dellink, |
ba3e3f50 ND |
1530 | }; |
1531 | ||
6dcd814b | 1532 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1533 | .handler = ipip6_rcv, |
1534 | .err_handler = ipip6_err, | |
c73cb5a2 | 1535 | .priority = 1, |
1da177e4 LT |
1536 | }; |
1537 | ||
2c8c1e72 | 1538 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) |
db44575f AK |
1539 | { |
1540 | int prio; | |
1541 | ||
1542 | for (prio = 1; prio < 4; prio++) { | |
1543 | int h; | |
1544 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1545 | struct ip_tunnel *t; |
62808f91 | 1546 | |
753ea8e9 | 1547 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 ED |
1548 | while (t != NULL) { |
1549 | unregister_netdevice_queue(t->dev, head); | |
753ea8e9 | 1550 | t = rtnl_dereference(t->next); |
62808f91 | 1551 | } |
db44575f AK |
1552 | } |
1553 | } | |
1554 | } | |
1555 | ||
2c8c1e72 | 1556 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1557 | { |
67101172 | 1558 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1559 | struct ip_tunnel *t; |
8190d900 | 1560 | int err; |
8190d900 | 1561 | |
29182176 PE |
1562 | sitn->tunnels[0] = sitn->tunnels_wc; |
1563 | sitn->tunnels[1] = sitn->tunnels_l; | |
1564 | sitn->tunnels[2] = sitn->tunnels_r; | |
1565 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1566 | ||
cd3dbc19 PE |
1567 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1568 | ipip6_tunnel_setup); | |
1569 | if (!sitn->fb_tunnel_dev) { | |
1570 | err = -ENOMEM; | |
1571 | goto err_alloc_dev; | |
1572 | } | |
be77e593 | 1573 | dev_net_set(sitn->fb_tunnel_dev, net); |
20300db1 | 1574 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
cd3dbc19 | 1575 | |
dd4080ee ED |
1576 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1577 | if (err) | |
1578 | goto err_dev_free; | |
1579 | ||
e0c93948 | 1580 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1581 | |
1582 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1583 | goto err_reg_dev; | |
1584 | ||
72b36015 TF |
1585 | t = netdev_priv(sitn->fb_tunnel_dev); |
1586 | ||
1587 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1588 | return 0; |
1589 | ||
cd3dbc19 | 1590 | err_reg_dev: |
1326c3d5 | 1591 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1592 | err_dev_free: |
1593 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1594 | err_alloc_dev: |
8190d900 PE |
1595 | return err; |
1596 | } | |
1597 | ||
2c8c1e72 | 1598 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1599 | { |
67101172 | 1600 | struct sit_net *sitn = net_generic(net, sit_net_id); |
62808f91 | 1601 | LIST_HEAD(list); |
8190d900 | 1602 | |
cd3dbc19 | 1603 | rtnl_lock(); |
62808f91 ED |
1604 | sit_destroy_tunnels(sitn, &list); |
1605 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1606 | unregister_netdevice_many(&list); | |
cd3dbc19 | 1607 | rtnl_unlock(); |
8190d900 PE |
1608 | } |
1609 | ||
1610 | static struct pernet_operations sit_net_ops = { | |
1611 | .init = sit_init_net, | |
1612 | .exit = sit_exit_net, | |
67101172 EB |
1613 | .id = &sit_net_id, |
1614 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1615 | }; |
1616 | ||
89c89458 | 1617 | static void __exit sit_cleanup(void) |
1da177e4 | 1618 | { |
ba3e3f50 | 1619 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1620 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1621 | |
67101172 | 1622 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1623 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1624 | } |
1625 | ||
89c89458 | 1626 | static int __init sit_init(void) |
1da177e4 LT |
1627 | { |
1628 | int err; | |
1629 | ||
f3213831 | 1630 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1631 | |
67101172 | 1632 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1633 | if (err < 0) |
d5aa407f AD |
1634 | return err; |
1635 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1636 | if (err < 0) { | |
f3213831 | 1637 | pr_info("%s: can't add protocol\n", __func__); |
ba3e3f50 | 1638 | goto xfrm_tunnel_failed; |
d5aa407f | 1639 | } |
ba3e3f50 ND |
1640 | err = rtnl_link_register(&sit_link_ops); |
1641 | if (err < 0) | |
1642 | goto rtnl_link_failed; | |
1643 | ||
1644 | out: | |
1da177e4 | 1645 | return err; |
ba3e3f50 ND |
1646 | |
1647 | rtnl_link_failed: | |
1648 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1649 | xfrm_tunnel_failed: | |
1650 | unregister_pernet_device(&sit_net_ops); | |
1651 | goto out; | |
1da177e4 | 1652 | } |
989e5b96 JR |
1653 | |
1654 | module_init(sit_init); | |
1655 | module_exit(sit_cleanup); | |
39c85086 | 1656 | MODULE_LICENSE("GPL"); |
57b1ec60 | 1657 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 1658 | MODULE_ALIAS_NETDEV("sit0"); |