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Commit | Line | Data |
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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 SH |
103 | remote == t->parms.iph.daddr && |
104 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
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 SH |
109 | if (remote == t->parms.iph.daddr && |
110 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
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 SH |
115 | if (local == t->parms.iph.saddr && |
116 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
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 | { | |
5e6700b3 ND |
469 | struct ip_tunnel *tunnel = netdev_priv(dev); |
470 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 471 | |
cd3dbc19 | 472 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 473 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 474 | } else { |
5e6700b3 ND |
475 | ipip6_tunnel_unlink(sitn, tunnel); |
476 | ipip6_tunnel_del_prl(tunnel, 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, | |
533 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
534 | err = 0; | |
535 | goto out; | |
536 | } | |
ec18d9a2 DM |
537 | if (type == ICMP_REDIRECT) { |
538 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
539 | IPPROTO_IPV6, 0); | |
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 | ||
7df37ff3 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 | ||
32b8a8e5 ND |
644 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
645 | tunnel->parms.iph.protocol != 0) | |
646 | goto out; | |
647 | ||
b0e380b1 | 648 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 649 | skb_reset_network_header(skb); |
8cdfab8a | 650 | IPCB(skb)->flags = 0; |
1da177e4 | 651 | skb->protocol = htons(ETH_P_IPV6); |
c7dc89c0 | 652 | |
7df37ff3 CB |
653 | if (packet_is_spoofed(skb, iph, tunnel)) { |
654 | tunnel->dev->stats.rx_errors++; | |
655 | goto out; | |
f4e0b4c5 ND |
656 | } |
657 | ||
ea23192e | 658 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); |
f4e0b4c5 ND |
659 | |
660 | err = IP_ECN_decapsulate(iph, skb); | |
661 | if (unlikely(err)) { | |
662 | if (log_ecn_error) | |
663 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
664 | &iph->saddr, iph->tos); | |
665 | if (err > 1) { | |
666 | ++tunnel->dev->stats.rx_frame_errors; | |
667 | ++tunnel->dev->stats.rx_errors; | |
668 | goto out; | |
669 | } | |
c7dc89c0 | 670 | } |
d19d56dd | 671 | |
15fc1f70 ED |
672 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
673 | tstats->rx_packets++; | |
674 | tstats->rx_bytes += skb->len; | |
675 | ||
caf586e5 | 676 | netif_rx(skb); |
8990f468 | 677 | |
1da177e4 LT |
678 | return 0; |
679 | } | |
680 | ||
6dcdd1b3 | 681 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 682 | return 1; |
1da177e4 | 683 | out: |
36ca34cc | 684 | kfree_skb(skb); |
1da177e4 LT |
685 | return 0; |
686 | } | |
687 | ||
32b8a8e5 ND |
688 | static const struct tnl_ptk_info tpi = { |
689 | /* no tunnel info required for ipip. */ | |
690 | .proto = htons(ETH_P_IP), | |
691 | }; | |
692 | ||
693 | static int ipip_rcv(struct sk_buff *skb) | |
694 | { | |
3d7b46cd | 695 | const struct iphdr *iph; |
32b8a8e5 ND |
696 | struct ip_tunnel *tunnel; |
697 | ||
3d7b46cd | 698 | iph = ip_hdr(skb); |
32b8a8e5 ND |
699 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
700 | iph->saddr, iph->daddr); | |
701 | if (tunnel != NULL) { | |
702 | if (tunnel->parms.iph.protocol != IPPROTO_IPIP && | |
703 | tunnel->parms.iph.protocol != 0) | |
704 | goto drop; | |
705 | ||
706 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
707 | goto drop; | |
737e828b LH |
708 | if (iptunnel_pull_header(skb, 0, tpi.proto)) |
709 | goto drop; | |
32b8a8e5 ND |
710 | return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error); |
711 | } | |
712 | ||
713 | return 1; | |
714 | ||
715 | drop: | |
716 | kfree_skb(skb); | |
717 | return 0; | |
718 | } | |
719 | ||
fa857afc | 720 | /* |
218774dc HFS |
721 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
722 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 723 | */ |
218774dc HFS |
724 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
725 | __be32 *v4dst) | |
1da177e4 | 726 | { |
fa857afc YH |
727 | #ifdef CONFIG_IPV6_SIT_6RD |
728 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
729 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 730 | unsigned int pbw0, pbi0; |
fa857afc YH |
731 | int pbi1; |
732 | u32 d; | |
733 | ||
734 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
735 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
736 | ||
e7db38c3 | 737 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
fa857afc YH |
738 | tunnel->ip6rd.relay_prefixlen; |
739 | ||
740 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
741 | if (pbi1 > 0) | |
e7db38c3 | 742 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
743 | (32 - pbi1); |
744 | ||
218774dc HFS |
745 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
746 | return true; | |
fa857afc YH |
747 | } |
748 | #else | |
1da177e4 | 749 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 750 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
751 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
752 | return true; | |
1da177e4 | 753 | } |
fa857afc | 754 | #endif |
218774dc HFS |
755 | return false; |
756 | } | |
757 | ||
758 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
759 | const struct in6_addr *v6dst) | |
760 | { | |
761 | __be32 dst = 0; | |
762 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
763 | return dst; |
764 | } | |
765 | ||
766 | /* | |
767 | * This function assumes it is being called from dev_queue_xmit() | |
768 | * and that skb is filled properly by that function. | |
769 | */ | |
770 | ||
6fef4c0c SH |
771 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
772 | struct net_device *dev) | |
1da177e4 | 773 | { |
2941a486 | 774 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
775 | const struct iphdr *tiph = &tunnel->parms.iph; |
776 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 777 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 778 | __be16 df = tiph->frag_off; |
1da177e4 | 779 | struct rtable *rt; /* Route to the other host */ |
15fc1f70 | 780 | struct net_device *tdev; /* Device to other host */ |
c2636b4d | 781 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 782 | __be32 dst = tiph->daddr; |
31e4543d | 783 | struct flowi4 fl4; |
1da177e4 | 784 | int mtu; |
b71d1d42 | 785 | const struct in6_addr *addr6; |
1da177e4 | 786 | int addr_type; |
0e6fbc5b PS |
787 | u8 ttl; |
788 | int err; | |
1da177e4 | 789 | |
1da177e4 LT |
790 | if (skb->protocol != htons(ETH_P_IPV6)) |
791 | goto tx_error; | |
792 | ||
c2bceb3d LEM |
793 | if (tos == 1) |
794 | tos = ipv6_get_dsfield(iph6); | |
795 | ||
c7dc89c0 FT |
796 | /* ISATAP (RFC4214) - must come before 6to4 */ |
797 | if (dev->priv_flags & IFF_ISATAP) { | |
798 | struct neighbour *neigh = NULL; | |
1e2927b0 | 799 | bool do_tx_error = false; |
c7dc89c0 | 800 | |
adf30907 | 801 | if (skb_dst(skb)) |
1e2927b0 | 802 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 FT |
803 | |
804 | if (neigh == NULL) { | |
7df37ff3 | 805 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
806 | goto tx_error; |
807 | } | |
808 | ||
3e866703 | 809 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
810 | addr_type = ipv6_addr_type(addr6); |
811 | ||
812 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
813 | ipv6_addr_is_isatap(addr6)) | |
814 | dst = addr6->s6_addr32[3]; | |
815 | else | |
1e2927b0 DM |
816 | do_tx_error = true; |
817 | ||
818 | neigh_release(neigh); | |
819 | if (do_tx_error) | |
c7dc89c0 FT |
820 | goto tx_error; |
821 | } | |
822 | ||
1da177e4 | 823 | if (!dst) |
218774dc | 824 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
825 | |
826 | if (!dst) { | |
827 | struct neighbour *neigh = NULL; | |
1e2927b0 | 828 | bool do_tx_error = false; |
1da177e4 | 829 | |
adf30907 | 830 | if (skb_dst(skb)) |
1e2927b0 | 831 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 LT |
832 | |
833 | if (neigh == NULL) { | |
7df37ff3 | 834 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
835 | goto tx_error; |
836 | } | |
837 | ||
3e866703 | 838 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
839 | addr_type = ipv6_addr_type(addr6); |
840 | ||
841 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 842 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
843 | addr_type = ipv6_addr_type(addr6); |
844 | } | |
845 | ||
1e2927b0 DM |
846 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
847 | dst = addr6->s6_addr32[3]; | |
848 | else | |
849 | do_tx_error = true; | |
1da177e4 | 850 | |
1e2927b0 DM |
851 | neigh_release(neigh); |
852 | if (do_tx_error) | |
853 | goto tx_error; | |
1da177e4 LT |
854 | } |
855 | ||
5e6700b3 | 856 | rt = ip_route_output_ports(tunnel->net, &fl4, NULL, |
78fbfd8a DM |
857 | dst, tiph->saddr, |
858 | 0, 0, | |
859 | IPPROTO_IPV6, RT_TOS(tos), | |
860 | tunnel->parms.link); | |
861 | if (IS_ERR(rt)) { | |
862 | dev->stats.tx_carrier_errors++; | |
863 | goto tx_error_icmp; | |
1da177e4 LT |
864 | } |
865 | if (rt->rt_type != RTN_UNICAST) { | |
866 | ip_rt_put(rt); | |
15fc1f70 | 867 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
868 | goto tx_error_icmp; |
869 | } | |
d8d1f30b | 870 | tdev = rt->dst.dev; |
1da177e4 LT |
871 | |
872 | if (tdev == dev) { | |
873 | ip_rt_put(rt); | |
15fc1f70 | 874 | dev->stats.collisions++; |
1da177e4 LT |
875 | goto tx_error; |
876 | } | |
877 | ||
292f4f3c | 878 | if (df) { |
d8d1f30b | 879 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 880 | |
292f4f3c | 881 | if (mtu < 68) { |
15fc1f70 | 882 | dev->stats.collisions++; |
292f4f3c HX |
883 | ip_rt_put(rt); |
884 | goto tx_error; | |
885 | } | |
1da177e4 | 886 | |
292f4f3c HX |
887 | if (mtu < IPV6_MIN_MTU) { |
888 | mtu = IPV6_MIN_MTU; | |
889 | df = 0; | |
890 | } | |
891 | ||
892 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
6700c270 | 893 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
292f4f3c HX |
894 | |
895 | if (skb->len > mtu) { | |
3ffe533c | 896 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
897 | ip_rt_put(rt); |
898 | goto tx_error; | |
899 | } | |
1da177e4 LT |
900 | } |
901 | ||
902 | if (tunnel->err_count > 0) { | |
bb80087a WY |
903 | if (time_before(jiffies, |
904 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
905 | tunnel->err_count--; |
906 | dst_link_failure(skb); | |
907 | } else | |
908 | tunnel->err_count = 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Okay, now see if we can stuff it in the buffer as-is. | |
913 | */ | |
914 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
915 | ||
cfbba49d PM |
916 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
917 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
918 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
919 | if (!new_skb) { | |
920 | ip_rt_put(rt); | |
15fc1f70 | 921 | dev->stats.tx_dropped++; |
1da177e4 | 922 | dev_kfree_skb(skb); |
6ed10654 | 923 | return NETDEV_TX_OK; |
1da177e4 LT |
924 | } |
925 | if (skb->sk) | |
926 | skb_set_owner_w(new_skb, skb->sk); | |
927 | dev_kfree_skb(skb); | |
928 | skb = new_skb; | |
0660e03f | 929 | iph6 = ipv6_hdr(skb); |
1da177e4 | 930 | } |
0e6fbc5b PS |
931 | ttl = tiph->ttl; |
932 | if (ttl == 0) | |
933 | ttl = iph6->hop_limit; | |
934 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 935 | |
61c1db7f ED |
936 | skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT); |
937 | if (IS_ERR(skb)) | |
938 | goto out; | |
3d483058 | 939 | |
8b7ed2d9 | 940 | err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, IPPROTO_IPV6, tos, |
963a88b3 | 941 | ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
0e6fbc5b | 942 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
6ed10654 | 943 | return NETDEV_TX_OK; |
1da177e4 LT |
944 | |
945 | tx_error_icmp: | |
946 | dst_link_failure(skb); | |
947 | tx_error: | |
1da177e4 | 948 | dev_kfree_skb(skb); |
61c1db7f ED |
949 | out: |
950 | dev->stats.tx_errors++; | |
6ed10654 | 951 | return NETDEV_TX_OK; |
1da177e4 LT |
952 | } |
953 | ||
32b8a8e5 ND |
954 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
955 | { | |
956 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
957 | const struct iphdr *tiph = &tunnel->parms.iph; | |
958 | ||
61c1db7f ED |
959 | skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP); |
960 | if (IS_ERR(skb)) | |
961 | goto out; | |
32b8a8e5 ND |
962 | |
963 | ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP); | |
964 | return NETDEV_TX_OK; | |
61c1db7f ED |
965 | out: |
966 | dev->stats.tx_errors++; | |
967 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
968 | } |
969 | ||
970 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
971 | struct net_device *dev) | |
972 | { | |
973 | switch (skb->protocol) { | |
974 | case htons(ETH_P_IP): | |
975 | ipip_tunnel_xmit(skb, dev); | |
976 | break; | |
977 | case htons(ETH_P_IPV6): | |
978 | ipip6_tunnel_xmit(skb, dev); | |
979 | break; | |
980 | default: | |
981 | goto tx_err; | |
982 | } | |
983 | ||
984 | return NETDEV_TX_OK; | |
985 | ||
986 | tx_err: | |
987 | dev->stats.tx_errors++; | |
988 | dev_kfree_skb(skb); | |
989 | return NETDEV_TX_OK; | |
990 | ||
991 | } | |
992 | ||
8a4a50f9 MS |
993 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
994 | { | |
995 | struct net_device *tdev = NULL; | |
996 | struct ip_tunnel *tunnel; | |
b71d1d42 | 997 | const struct iphdr *iph; |
31e4543d | 998 | struct flowi4 fl4; |
8a4a50f9 MS |
999 | |
1000 | tunnel = netdev_priv(dev); | |
1001 | iph = &tunnel->parms.iph; | |
1002 | ||
1003 | if (iph->daddr) { | |
5e6700b3 ND |
1004 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1005 | NULL, | |
78fbfd8a DM |
1006 | iph->daddr, iph->saddr, |
1007 | 0, 0, | |
1008 | IPPROTO_IPV6, | |
1009 | RT_TOS(iph->tos), | |
1010 | tunnel->parms.link); | |
b23dd4fe DM |
1011 | |
1012 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1013 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1014 | ip_rt_put(rt); |
1015 | } | |
1016 | dev->flags |= IFF_POINTOPOINT; | |
1017 | } | |
1018 | ||
1019 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1020 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 MS |
1021 | |
1022 | if (tdev) { | |
1023 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
1024 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
1025 | if (dev->mtu < IPV6_MIN_MTU) | |
1026 | dev->mtu = IPV6_MIN_MTU; | |
1027 | } | |
1028 | dev->iflink = tunnel->parms.link; | |
1029 | } | |
1030 | ||
f3723416 ND |
1031 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) |
1032 | { | |
5e6700b3 | 1033 | struct net *net = t->net; |
f3723416 ND |
1034 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1035 | ||
1036 | ipip6_tunnel_unlink(sitn, t); | |
1037 | synchronize_net(); | |
1038 | t->parms.iph.saddr = p->iph.saddr; | |
1039 | t->parms.iph.daddr = p->iph.daddr; | |
1040 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1041 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1042 | ipip6_tunnel_link(sitn, t); | |
1043 | t->parms.iph.ttl = p->iph.ttl; | |
1044 | t->parms.iph.tos = p->iph.tos; | |
1045 | if (t->parms.link != p->link) { | |
1046 | t->parms.link = p->link; | |
1047 | ipip6_tunnel_bind_dev(t->dev); | |
1048 | } | |
1049 | netdev_state_change(t->dev); | |
1050 | } | |
1051 | ||
e2f1f072 ND |
1052 | #ifdef CONFIG_IPV6_SIT_6RD |
1053 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1054 | struct ip_tunnel_6rd *ip6rd) | |
1055 | { | |
1056 | struct in6_addr prefix; | |
1057 | __be32 relay_prefix; | |
1058 | ||
1059 | if (ip6rd->relay_prefixlen > 32 || | |
1060 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1061 | return -EINVAL; | |
1062 | ||
1063 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1064 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1065 | return -EINVAL; | |
1066 | if (ip6rd->relay_prefixlen) | |
1067 | relay_prefix = ip6rd->relay_prefix & | |
1068 | htonl(0xffffffffUL << | |
1069 | (32 - ip6rd->relay_prefixlen)); | |
1070 | else | |
1071 | relay_prefix = 0; | |
1072 | if (relay_prefix != ip6rd->relay_prefix) | |
1073 | return -EINVAL; | |
1074 | ||
1075 | t->ip6rd.prefix = prefix; | |
1076 | t->ip6rd.relay_prefix = relay_prefix; | |
1077 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1078 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
1079 | netdev_state_change(t->dev); | |
1080 | return 0; | |
1081 | } | |
1082 | #endif | |
1083 | ||
1da177e4 LT |
1084 | static int |
1085 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
1086 | { | |
1087 | int err = 0; | |
1088 | struct ip_tunnel_parm p; | |
fadf6bf0 | 1089 | struct ip_tunnel_prl prl; |
1da177e4 | 1090 | struct ip_tunnel *t; |
ca8def14 PE |
1091 | struct net *net = dev_net(dev); |
1092 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
1093 | #ifdef CONFIG_IPV6_SIT_6RD |
1094 | struct ip_tunnel_6rd ip6rd; | |
1095 | #endif | |
1da177e4 LT |
1096 | |
1097 | switch (cmd) { | |
1098 | case SIOCGETTUNNEL: | |
fa857afc YH |
1099 | #ifdef CONFIG_IPV6_SIT_6RD |
1100 | case SIOCGET6RD: | |
1101 | #endif | |
1da177e4 | 1102 | t = NULL; |
cd3dbc19 | 1103 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1104 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1105 | err = -EFAULT; | |
1106 | break; | |
1107 | } | |
ca8def14 | 1108 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
1109 | } |
1110 | if (t == NULL) | |
2941a486 | 1111 | t = netdev_priv(dev); |
fa857afc YH |
1112 | |
1113 | err = -EFAULT; | |
1114 | if (cmd == SIOCGETTUNNEL) { | |
1115 | memcpy(&p, &t->parms, sizeof(p)); | |
1116 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1117 | sizeof(p))) | |
1118 | goto done; | |
1119 | #ifdef CONFIG_IPV6_SIT_6RD | |
1120 | } else { | |
4e3fd7a0 | 1121 | ip6rd.prefix = t->ip6rd.prefix; |
fa857afc YH |
1122 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
1123 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1124 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1125 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1126 | sizeof(ip6rd))) | |
1127 | goto done; | |
1128 | #endif | |
1129 | } | |
1130 | err = 0; | |
1da177e4 LT |
1131 | break; |
1132 | ||
1133 | case SIOCADDTUNNEL: | |
1134 | case SIOCCHGTUNNEL: | |
1135 | err = -EPERM; | |
af31f412 | 1136 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1137 | goto done; |
1138 | ||
1139 | err = -EFAULT; | |
1140 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1141 | goto done; | |
1142 | ||
1143 | err = -EINVAL; | |
32b8a8e5 ND |
1144 | if (p.iph.protocol != IPPROTO_IPV6 && |
1145 | p.iph.protocol != IPPROTO_IPIP && | |
1146 | p.iph.protocol != 0) | |
1147 | goto done; | |
1148 | if (p.iph.version != 4 || | |
1da177e4 LT |
1149 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) |
1150 | goto done; | |
1151 | if (p.iph.ttl) | |
1152 | p.iph.frag_off |= htons(IP_DF); | |
1153 | ||
ca8def14 | 1154 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1155 | |
cd3dbc19 | 1156 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1157 | if (t != NULL) { |
1158 | if (t->dev != dev) { | |
1159 | err = -EEXIST; | |
1160 | break; | |
1161 | } | |
1162 | } else { | |
1163 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1164 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1165 | err = -EINVAL; | |
1166 | break; | |
1167 | } | |
2941a486 | 1168 | t = netdev_priv(dev); |
1da177e4 | 1169 | } |
f9cd5a55 | 1170 | |
f3723416 | 1171 | ipip6_tunnel_update(t, &p); |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | if (t) { | |
1175 | err = 0; | |
1da177e4 LT |
1176 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) |
1177 | err = -EFAULT; | |
1178 | } else | |
1179 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1180 | break; | |
1181 | ||
1182 | case SIOCDELTUNNEL: | |
1183 | err = -EPERM; | |
af31f412 | 1184 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1185 | goto done; |
1186 | ||
cd3dbc19 | 1187 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
1188 | err = -EFAULT; |
1189 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1190 | goto done; | |
1191 | err = -ENOENT; | |
ca8def14 | 1192 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1193 | goto done; |
1194 | err = -EPERM; | |
cd3dbc19 | 1195 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
1196 | goto done; |
1197 | dev = t->dev; | |
1198 | } | |
22f8cde5 SH |
1199 | unregister_netdevice(dev); |
1200 | err = 0; | |
1da177e4 LT |
1201 | break; |
1202 | ||
300aaeea | 1203 | case SIOCGETPRL: |
2b4743bd YH |
1204 | err = -EINVAL; |
1205 | if (dev == sitn->fb_tunnel_dev) | |
1206 | goto done; | |
1207 | err = -ENOENT; | |
1208 | if (!(t = netdev_priv(dev))) | |
1209 | goto done; | |
1210 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1211 | break; | |
1212 | ||
fadf6bf0 TF |
1213 | case SIOCADDPRL: |
1214 | case SIOCDELPRL: | |
1215 | case SIOCCHGPRL: | |
1216 | err = -EPERM; | |
af31f412 | 1217 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fadf6bf0 TF |
1218 | goto done; |
1219 | err = -EINVAL; | |
cd3dbc19 | 1220 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
1221 | goto done; |
1222 | err = -EFAULT; | |
1223 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1224 | goto done; | |
1225 | err = -ENOENT; | |
1226 | if (!(t = netdev_priv(dev))) | |
1227 | goto done; | |
1228 | ||
300aaeea | 1229 | switch (cmd) { |
300aaeea | 1230 | case SIOCDELPRL: |
fadf6bf0 | 1231 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
1232 | break; |
1233 | case SIOCADDPRL: | |
1234 | case SIOCCHGPRL: | |
fadf6bf0 | 1235 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
1236 | break; |
1237 | } | |
2b4743bd | 1238 | netdev_state_change(dev); |
fadf6bf0 TF |
1239 | break; |
1240 | ||
fa857afc YH |
1241 | #ifdef CONFIG_IPV6_SIT_6RD |
1242 | case SIOCADD6RD: | |
1243 | case SIOCCHG6RD: | |
1244 | case SIOCDEL6RD: | |
1245 | err = -EPERM; | |
af31f412 | 1246 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
fa857afc YH |
1247 | goto done; |
1248 | ||
1249 | err = -EFAULT; | |
1250 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1251 | sizeof(ip6rd))) | |
1252 | goto done; | |
1253 | ||
1254 | t = netdev_priv(dev); | |
1255 | ||
1256 | if (cmd != SIOCDEL6RD) { | |
e2f1f072 ND |
1257 | err = ipip6_tunnel_update_6rd(t, &ip6rd); |
1258 | if (err < 0) | |
fa857afc | 1259 | goto done; |
fa857afc | 1260 | } else |
e0c93948 | 1261 | ipip6_tunnel_clone_6rd(dev, sitn); |
fa857afc YH |
1262 | |
1263 | err = 0; | |
1264 | break; | |
1265 | #endif | |
1266 | ||
1da177e4 LT |
1267 | default: |
1268 | err = -EINVAL; | |
1269 | } | |
1270 | ||
1271 | done: | |
1272 | return err; | |
1273 | } | |
1274 | ||
1da177e4 LT |
1275 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1276 | { | |
1277 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1278 | return -EINVAL; | |
1279 | dev->mtu = new_mtu; | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1326c3d5 SH |
1283 | static const struct net_device_ops ipip6_netdev_ops = { |
1284 | .ndo_uninit = ipip6_tunnel_uninit, | |
32b8a8e5 | 1285 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 SH |
1286 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
1287 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
f61dd388 | 1288 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1326c3d5 SH |
1289 | }; |
1290 | ||
15fc1f70 ED |
1291 | static void ipip6_dev_free(struct net_device *dev) |
1292 | { | |
1293 | free_percpu(dev->tstats); | |
1294 | free_netdev(dev); | |
1295 | } | |
1296 | ||
61c1db7f ED |
1297 | #define SIT_FEATURES (NETIF_F_SG | \ |
1298 | NETIF_F_FRAGLIST | \ | |
1299 | NETIF_F_HIGHDMA | \ | |
1300 | NETIF_F_GSO_SOFTWARE | \ | |
1301 | NETIF_F_HW_CSUM) | |
1302 | ||
1da177e4 LT |
1303 | static void ipip6_tunnel_setup(struct net_device *dev) |
1304 | { | |
1326c3d5 | 1305 | dev->netdev_ops = &ipip6_netdev_ops; |
15fc1f70 | 1306 | dev->destructor = ipip6_dev_free; |
1da177e4 LT |
1307 | |
1308 | dev->type = ARPHRD_SIT; | |
1309 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1310 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1311 | dev->flags = IFF_NOARP; |
f2ba025b | 1312 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1313 | dev->iflink = 0; |
1314 | dev->addr_len = 4; | |
8df40d10 | 1315 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1316 | dev->features |= SIT_FEATURES; |
1317 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1318 | } |
1319 | ||
15fc1f70 | 1320 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1321 | { |
1326c3d5 | 1322 | struct ip_tunnel *tunnel = netdev_priv(dev); |
827da44c | 1323 | int i; |
1da177e4 LT |
1324 | |
1325 | tunnel->dev = dev; | |
5e6700b3 | 1326 | tunnel->net = dev_net(dev); |
1da177e4 LT |
1327 | |
1328 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1329 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1330 | ||
8a4a50f9 | 1331 | ipip6_tunnel_bind_dev(dev); |
15fc1f70 ED |
1332 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1333 | if (!dev->tstats) | |
1334 | return -ENOMEM; | |
1335 | ||
827da44c JS |
1336 | for_each_possible_cpu(i) { |
1337 | struct pcpu_tstats *ipip6_tunnel_stats; | |
1338 | ipip6_tunnel_stats = per_cpu_ptr(dev->tstats, i); | |
1339 | u64_stats_init(&ipip6_tunnel_stats->syncp); | |
1340 | } | |
1341 | ||
15fc1f70 | 1342 | return 0; |
1da177e4 LT |
1343 | } |
1344 | ||
dd4080ee | 1345 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1346 | { |
2941a486 | 1347 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1348 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1349 | struct net *net = dev_net(dev); |
1350 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
827da44c | 1351 | int i; |
1da177e4 LT |
1352 | |
1353 | tunnel->dev = dev; | |
5e6700b3 | 1354 | tunnel->net = dev_net(dev); |
1da177e4 LT |
1355 | strcpy(tunnel->parms.name, dev->name); |
1356 | ||
1357 | iph->version = 4; | |
1358 | iph->protocol = IPPROTO_IPV6; | |
1359 | iph->ihl = 5; | |
1360 | iph->ttl = 64; | |
1361 | ||
dd4080ee ED |
1362 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1363 | if (!dev->tstats) | |
1364 | return -ENOMEM; | |
827da44c JS |
1365 | |
1366 | for_each_possible_cpu(i) { | |
1367 | struct pcpu_tstats *ipip6_fb_stats; | |
1368 | ipip6_fb_stats = per_cpu_ptr(dev->tstats, i); | |
1369 | u64_stats_init(&ipip6_fb_stats->syncp); | |
1370 | } | |
1371 | ||
1da177e4 | 1372 | dev_hold(dev); |
cf778b00 | 1373 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
dd4080ee | 1374 | return 0; |
1da177e4 LT |
1375 | } |
1376 | ||
32b8a8e5 ND |
1377 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[]) |
1378 | { | |
1379 | u8 proto; | |
1380 | ||
c2ff682a | 1381 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1382 | return 0; |
1383 | ||
1384 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1385 | if (proto != IPPROTO_IPV6 && | |
1386 | proto != IPPROTO_IPIP && | |
1387 | proto != 0) | |
1388 | return -EINVAL; | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
f3723416 ND |
1393 | static void ipip6_netlink_parms(struct nlattr *data[], |
1394 | struct ip_tunnel_parm *parms) | |
1395 | { | |
1396 | memset(parms, 0, sizeof(*parms)); | |
1397 | ||
1398 | parms->iph.version = 4; | |
1399 | parms->iph.protocol = IPPROTO_IPV6; | |
1400 | parms->iph.ihl = 5; | |
1401 | parms->iph.ttl = 64; | |
1402 | ||
1403 | if (!data) | |
1404 | return; | |
1405 | ||
1406 | if (data[IFLA_IPTUN_LINK]) | |
1407 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1408 | ||
1409 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1410 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1411 | |
1412 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1413 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1414 | |
1415 | if (data[IFLA_IPTUN_TTL]) { | |
1416 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1417 | if (parms->iph.ttl) | |
1418 | parms->iph.frag_off = htons(IP_DF); | |
1419 | } | |
1420 | ||
1421 | if (data[IFLA_IPTUN_TOS]) | |
1422 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1423 | ||
1424 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1425 | parms->iph.frag_off = htons(IP_DF); | |
1426 | ||
1427 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1428 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1429 | |
1430 | if (data[IFLA_IPTUN_PROTO]) | |
1431 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1432 | ||
f3723416 ND |
1433 | } |
1434 | ||
e2f1f072 ND |
1435 | #ifdef CONFIG_IPV6_SIT_6RD |
1436 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1437 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1438 | struct ip_tunnel_6rd *ip6rd) | |
1439 | { | |
1440 | bool ret = false; | |
1441 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1442 | ||
1443 | if (!data) | |
1444 | return ret; | |
1445 | ||
1446 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1447 | ret = true; | |
1448 | nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], | |
1449 | sizeof(struct in6_addr)); | |
1450 | } | |
1451 | ||
1452 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1453 | ret = true; | |
1454 | ip6rd->relay_prefix = | |
1455 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1456 | } | |
1457 | ||
1458 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1459 | ret = true; | |
1460 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1461 | } | |
1462 | ||
1463 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1464 | ret = true; | |
1465 | ip6rd->relay_prefixlen = | |
1466 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1467 | } | |
1468 | ||
1469 | return ret; | |
1470 | } | |
1471 | #endif | |
1472 | ||
f3723416 ND |
1473 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
1474 | struct nlattr *tb[], struct nlattr *data[]) | |
1475 | { | |
1476 | struct net *net = dev_net(dev); | |
1477 | struct ip_tunnel *nt; | |
e2f1f072 ND |
1478 | #ifdef CONFIG_IPV6_SIT_6RD |
1479 | struct ip_tunnel_6rd ip6rd; | |
1480 | #endif | |
1481 | int err; | |
f3723416 ND |
1482 | |
1483 | nt = netdev_priv(dev); | |
1484 | ipip6_netlink_parms(data, &nt->parms); | |
1485 | ||
1486 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1487 | return -EEXIST; | |
1488 | ||
e2f1f072 ND |
1489 | err = ipip6_tunnel_create(dev); |
1490 | if (err < 0) | |
1491 | return err; | |
1492 | ||
1493 | #ifdef CONFIG_IPV6_SIT_6RD | |
1494 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1495 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1496 | #endif | |
1497 | ||
1498 | return err; | |
f3723416 ND |
1499 | } |
1500 | ||
1501 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
1502 | struct nlattr *data[]) | |
1503 | { | |
86bd68bf | 1504 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1505 | struct ip_tunnel_parm p; |
86bd68bf | 1506 | struct net *net = t->net; |
f3723416 | 1507 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1508 | #ifdef CONFIG_IPV6_SIT_6RD |
1509 | struct ip_tunnel_6rd ip6rd; | |
1510 | #endif | |
f3723416 ND |
1511 | |
1512 | if (dev == sitn->fb_tunnel_dev) | |
1513 | return -EINVAL; | |
1514 | ||
1515 | ipip6_netlink_parms(data, &p); | |
1516 | ||
1517 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1518 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1519 | return -EINVAL; | |
1520 | ||
1521 | t = ipip6_tunnel_locate(net, &p, 0); | |
1522 | ||
1523 | if (t) { | |
1524 | if (t->dev != dev) | |
1525 | return -EEXIST; | |
1526 | } else | |
1527 | t = netdev_priv(dev); | |
1528 | ||
1529 | ipip6_tunnel_update(t, &p); | |
e2f1f072 ND |
1530 | |
1531 | #ifdef CONFIG_IPV6_SIT_6RD | |
1532 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1533 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1534 | #endif | |
1535 | ||
f3723416 ND |
1536 | return 0; |
1537 | } | |
1538 | ||
e4c94a9c | 1539 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1540 | { |
1541 | return | |
1542 | /* IFLA_IPTUN_LINK */ | |
1543 | nla_total_size(4) + | |
1544 | /* IFLA_IPTUN_LOCAL */ | |
1545 | nla_total_size(4) + | |
1546 | /* IFLA_IPTUN_REMOTE */ | |
1547 | nla_total_size(4) + | |
1548 | /* IFLA_IPTUN_TTL */ | |
1549 | nla_total_size(1) + | |
1550 | /* IFLA_IPTUN_TOS */ | |
1551 | nla_total_size(1) + | |
a12c9a85 ND |
1552 | /* IFLA_IPTUN_PMTUDISC */ |
1553 | nla_total_size(1) + | |
1554 | /* IFLA_IPTUN_FLAGS */ | |
1555 | nla_total_size(2) + | |
32b8a8e5 ND |
1556 | /* IFLA_IPTUN_PROTO */ |
1557 | nla_total_size(1) + | |
e2f1f072 ND |
1558 | #ifdef CONFIG_IPV6_SIT_6RD |
1559 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1560 | nla_total_size(sizeof(struct in6_addr)) + | |
1561 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1562 | nla_total_size(4) + | |
1563 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1564 | nla_total_size(2) + | |
1565 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1566 | nla_total_size(2) + | |
1567 | #endif | |
ba3e3f50 ND |
1568 | 0; |
1569 | } | |
1570 | ||
e4c94a9c | 1571 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1572 | { |
1573 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1574 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1575 | ||
1576 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1577 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1578 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1579 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
a12c9a85 ND |
1580 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1581 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1582 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1583 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
d440b720 | 1584 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) |
ba3e3f50 | 1585 | goto nla_put_failure; |
e2f1f072 ND |
1586 | |
1587 | #ifdef CONFIG_IPV6_SIT_6RD | |
1588 | if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), | |
1589 | &tunnel->ip6rd.prefix) || | |
1590 | nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1591 | tunnel->ip6rd.relay_prefix) || | |
1592 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, | |
1593 | tunnel->ip6rd.prefixlen) || | |
1594 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1595 | tunnel->ip6rd.relay_prefixlen)) | |
1596 | goto nla_put_failure; | |
1597 | #endif | |
1598 | ||
ba3e3f50 ND |
1599 | return 0; |
1600 | ||
1601 | nla_put_failure: | |
1602 | return -EMSGSIZE; | |
1603 | } | |
1604 | ||
f3723416 ND |
1605 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1606 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1607 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1608 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1609 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1610 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1611 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1612 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1613 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1614 | #ifdef CONFIG_IPV6_SIT_6RD |
1615 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1616 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1617 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1618 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1619 | #endif | |
f3723416 ND |
1620 | }; |
1621 | ||
9434266f WB |
1622 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1623 | { | |
1624 | struct net *net = dev_net(dev); | |
1625 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1626 | ||
1627 | if (dev != sitn->fb_tunnel_dev) | |
1628 | unregister_netdevice_queue(dev, head); | |
1629 | } | |
1630 | ||
ba3e3f50 ND |
1631 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1632 | .kind = "sit", | |
1633 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1634 | .policy = ipip6_policy, |
ba3e3f50 | 1635 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1636 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1637 | .validate = ipip6_validate, |
f3723416 ND |
1638 | .newlink = ipip6_newlink, |
1639 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1640 | .get_size = ipip6_get_size, |
1641 | .fill_info = ipip6_fill_info, | |
9434266f | 1642 | .dellink = ipip6_dellink, |
ba3e3f50 ND |
1643 | }; |
1644 | ||
6dcd814b | 1645 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1646 | .handler = ipip6_rcv, |
1647 | .err_handler = ipip6_err, | |
c73cb5a2 | 1648 | .priority = 1, |
1da177e4 LT |
1649 | }; |
1650 | ||
32b8a8e5 ND |
1651 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1652 | .handler = ipip_rcv, | |
1653 | .err_handler = ipip6_err, | |
1654 | .priority = 2, | |
1655 | }; | |
1656 | ||
9434266f WB |
1657 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1658 | struct list_head *head) | |
db44575f | 1659 | { |
9434266f | 1660 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1661 | struct net_device *dev, *aux; |
db44575f AK |
1662 | int prio; |
1663 | ||
5e6700b3 ND |
1664 | for_each_netdev_safe(net, dev, aux) |
1665 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1666 | unregister_netdevice_queue(dev, head); | |
1667 | ||
db44575f AK |
1668 | for (prio = 1; prio < 4; prio++) { |
1669 | int h; | |
1670 | for (h = 0; h < HASH_SIZE; h++) { | |
753ea8e9 | 1671 | struct ip_tunnel *t; |
62808f91 | 1672 | |
753ea8e9 | 1673 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
62808f91 | 1674 | while (t != NULL) { |
5e6700b3 ND |
1675 | /* If dev is in the same netns, it has already |
1676 | * been added to the list by the previous loop. | |
1677 | */ | |
fc8f999d | 1678 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1679 | unregister_netdevice_queue(t->dev, |
1680 | head); | |
753ea8e9 | 1681 | t = rtnl_dereference(t->next); |
62808f91 | 1682 | } |
db44575f AK |
1683 | } |
1684 | } | |
1685 | } | |
1686 | ||
2c8c1e72 | 1687 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1688 | { |
67101172 | 1689 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1690 | struct ip_tunnel *t; |
8190d900 | 1691 | int err; |
8190d900 | 1692 | |
29182176 PE |
1693 | sitn->tunnels[0] = sitn->tunnels_wc; |
1694 | sitn->tunnels[1] = sitn->tunnels_l; | |
1695 | sitn->tunnels[2] = sitn->tunnels_r; | |
1696 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1697 | ||
cd3dbc19 PE |
1698 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1699 | ipip6_tunnel_setup); | |
1700 | if (!sitn->fb_tunnel_dev) { | |
1701 | err = -ENOMEM; | |
1702 | goto err_alloc_dev; | |
1703 | } | |
be77e593 | 1704 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1705 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1706 | /* FB netdevice is special: we have one, and only one per netns. |
1707 | * Allowing to move it to another netns is clearly unsafe. | |
1708 | */ | |
1709 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1710 | |
dd4080ee ED |
1711 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
1712 | if (err) | |
1713 | goto err_dev_free; | |
1714 | ||
e0c93948 | 1715 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
cd3dbc19 PE |
1716 | |
1717 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1718 | goto err_reg_dev; | |
1719 | ||
72b36015 TF |
1720 | t = netdev_priv(sitn->fb_tunnel_dev); |
1721 | ||
1722 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1723 | return 0; |
1724 | ||
cd3dbc19 | 1725 | err_reg_dev: |
1326c3d5 | 1726 | dev_put(sitn->fb_tunnel_dev); |
dd4080ee ED |
1727 | err_dev_free: |
1728 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
cd3dbc19 | 1729 | err_alloc_dev: |
8190d900 PE |
1730 | return err; |
1731 | } | |
1732 | ||
2c8c1e72 | 1733 | static void __net_exit sit_exit_net(struct net *net) |
8190d900 | 1734 | { |
62808f91 | 1735 | LIST_HEAD(list); |
8190d900 | 1736 | |
cd3dbc19 | 1737 | rtnl_lock(); |
9434266f | 1738 | sit_destroy_tunnels(net, &list); |
62808f91 | 1739 | unregister_netdevice_many(&list); |
cd3dbc19 | 1740 | rtnl_unlock(); |
8190d900 PE |
1741 | } |
1742 | ||
1743 | static struct pernet_operations sit_net_ops = { | |
1744 | .init = sit_init_net, | |
1745 | .exit = sit_exit_net, | |
67101172 EB |
1746 | .id = &sit_net_id, |
1747 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1748 | }; |
1749 | ||
89c89458 | 1750 | static void __exit sit_cleanup(void) |
1da177e4 | 1751 | { |
ba3e3f50 | 1752 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1753 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1754 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
db44575f | 1755 | |
67101172 | 1756 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1757 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1758 | } |
1759 | ||
89c89458 | 1760 | static int __init sit_init(void) |
1da177e4 LT |
1761 | { |
1762 | int err; | |
1763 | ||
f3213831 | 1764 | pr_info("IPv6 over IPv4 tunneling driver\n"); |
1da177e4 | 1765 | |
67101172 | 1766 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1767 | if (err < 0) |
d5aa407f AD |
1768 | return err; |
1769 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1770 | if (err < 0) { | |
32b8a8e5 | 1771 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1772 | goto xfrm_tunnel_failed; |
d5aa407f | 1773 | } |
32b8a8e5 ND |
1774 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1775 | if (err < 0) { | |
1776 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1777 | goto xfrm_tunnel4_failed; | |
1778 | } | |
ba3e3f50 ND |
1779 | err = rtnl_link_register(&sit_link_ops); |
1780 | if (err < 0) | |
1781 | goto rtnl_link_failed; | |
1782 | ||
1783 | out: | |
1da177e4 | 1784 | return err; |
ba3e3f50 ND |
1785 | |
1786 | rtnl_link_failed: | |
32b8a8e5 ND |
1787 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
1788 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
1789 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1790 | xfrm_tunnel_failed: | |
1791 | unregister_pernet_device(&sit_net_ops); | |
1792 | goto out; | |
1da177e4 | 1793 | } |
989e5b96 JR |
1794 | |
1795 | module_init(sit_init); | |
1796 | module_exit(sit_cleanup); | |
39c85086 | 1797 | MODULE_LICENSE("GPL"); |
8909c9ad | 1798 | MODULE_ALIAS_NETDEV("sit0"); |