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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
4 | * Linux INET6 implementation | |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
9 | * | |
1da177e4 LT |
10 | * Changes: |
11 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
12 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 13 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
14 | */ |
15 | ||
f3213831 JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
1da177e4 | 18 | #include <linux/module.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/errno.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
1da177e4 LT |
24 | #include <linux/net.h> |
25 | #include <linux/in6.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/if_arp.h> | |
28 | #include <linux/icmp.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
7c0f6ba6 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 33 | #include <linux/if_ether.h> |
1da177e4 LT |
34 | |
35 | #include <net/sock.h> | |
36 | #include <net/snmp.h> | |
37 | ||
38 | #include <net/ipv6.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/transp_v6.h> | |
41 | #include <net/ip6_fib.h> | |
42 | #include <net/ip6_route.h> | |
43 | #include <net/ndisc.h> | |
44 | #include <net/addrconf.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/udp.h> | |
47 | #include <net/icmp.h> | |
c5441932 | 48 | #include <net/ip_tunnels.h> |
1da177e4 LT |
49 | #include <net/inet_ecn.h> |
50 | #include <net/xfrm.h> | |
51 | #include <net/dsfield.h> | |
8190d900 PE |
52 | #include <net/net_namespace.h> |
53 | #include <net/netns/generic.h> | |
1da177e4 LT |
54 | |
55 | /* | |
56 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
57 | ||
58 | For comments look at net/ipv4/ip_gre.c --ANK | |
59 | */ | |
60 | ||
e87a8f24 | 61 | #define IP6_SIT_HASH_SIZE 16 |
e69a4adc | 62 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 63 | |
f4e0b4c5 ND |
64 | static bool log_ecn_error = true; |
65 | module_param(log_ecn_error, bool, 0644); | |
66 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
67 | ||
15fc1f70 | 68 | static int ipip6_tunnel_init(struct net_device *dev); |
1da177e4 | 69 | static void ipip6_tunnel_setup(struct net_device *dev); |
15fc1f70 | 70 | static void ipip6_dev_free(struct net_device *dev); |
218774dc HFS |
71 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
72 | __be32 *v4dst); | |
ba3e3f50 | 73 | static struct rtnl_link_ops sit_link_ops __read_mostly; |
1da177e4 | 74 | |
c7d03a00 | 75 | static unsigned int sit_net_id __read_mostly; |
8190d900 | 76 | struct sit_net { |
e87a8f24 JK |
77 | struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; |
78 | struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; | |
79 | struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; | |
3a43be3c ED |
80 | struct ip_tunnel __rcu *tunnels_wc[1]; |
81 | struct ip_tunnel __rcu **tunnels[4]; | |
29182176 | 82 | |
cd3dbc19 | 83 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
84 | }; |
85 | ||
fd5d687b CH |
86 | static inline struct sit_net *dev_to_sit_net(struct net_device *dev) |
87 | { | |
88 | struct ip_tunnel *t = netdev_priv(dev); | |
89 | ||
90 | return net_generic(t->net, sit_net_id); | |
91 | } | |
92 | ||
4543c10d ED |
93 | /* |
94 | * Must be invoked with rcu_read_lock | |
95 | */ | |
3e866703 | 96 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
3051fbec DA |
97 | struct net_device *dev, |
98 | __be32 remote, __be32 local, | |
99 | int sifindex) | |
1da177e4 | 100 | { |
3a43be3c ED |
101 | unsigned int h0 = HASH(remote); |
102 | unsigned int h1 = HASH(local); | |
1da177e4 | 103 | struct ip_tunnel *t; |
29182176 | 104 | struct sit_net *sitn = net_generic(net, sit_net_id); |
3051fbec | 105 | int ifindex = dev ? dev->ifindex : 0; |
1da177e4 | 106 | |
e086cadc | 107 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
1da177e4 | 108 | if (local == t->parms.iph.saddr && |
4fddbf5d | 109 | remote == t->parms.iph.daddr && |
3051fbec DA |
110 | (!dev || !t->parms.link || ifindex == t->parms.link || |
111 | sifindex == t->parms.link) && | |
4fddbf5d | 112 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
113 | return t; |
114 | } | |
e086cadc | 115 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
4fddbf5d | 116 | if (remote == t->parms.iph.daddr && |
3051fbec DA |
117 | (!dev || !t->parms.link || ifindex == t->parms.link || |
118 | sifindex == t->parms.link) && | |
4fddbf5d | 119 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
120 | return t; |
121 | } | |
e086cadc | 122 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
4fddbf5d | 123 | if (local == t->parms.iph.saddr && |
3051fbec DA |
124 | (!dev || !t->parms.link || ifindex == t->parms.link || |
125 | sifindex == t->parms.link) && | |
4fddbf5d | 126 | (t->dev->flags & IFF_UP)) |
1da177e4 LT |
127 | return t; |
128 | } | |
4543c10d | 129 | t = rcu_dereference(sitn->tunnels_wc[0]); |
53b24b8f | 130 | if (t && (t->dev->flags & IFF_UP)) |
1da177e4 LT |
131 | return t; |
132 | return NULL; | |
133 | } | |
134 | ||
3a43be3c | 135 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 136 | struct ip_tunnel_parm *parms) |
1da177e4 | 137 | { |
420fe234 YH |
138 | __be32 remote = parms->iph.daddr; |
139 | __be32 local = parms->iph.saddr; | |
3a43be3c | 140 | unsigned int h = 0; |
1da177e4 LT |
141 | int prio = 0; |
142 | ||
143 | if (remote) { | |
144 | prio |= 2; | |
145 | h ^= HASH(remote); | |
146 | } | |
147 | if (local) { | |
148 | prio |= 1; | |
149 | h ^= HASH(local); | |
150 | } | |
29182176 | 151 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
152 | } |
153 | ||
3a43be3c | 154 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
ca8def14 | 155 | struct ip_tunnel *t) |
420fe234 | 156 | { |
ca8def14 | 157 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
158 | } |
159 | ||
ca8def14 | 160 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 161 | { |
3a43be3c ED |
162 | struct ip_tunnel __rcu **tp; |
163 | struct ip_tunnel *iter; | |
164 | ||
165 | for (tp = ipip6_bucket(sitn, t); | |
166 | (iter = rtnl_dereference(*tp)) != NULL; | |
167 | tp = &iter->next) { | |
168 | if (t == iter) { | |
cf778b00 | 169 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
170 | break; |
171 | } | |
172 | } | |
173 | } | |
174 | ||
ca8def14 | 175 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 176 | { |
3a43be3c | 177 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
1da177e4 | 178 | |
cf778b00 ED |
179 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
180 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
181 | } |
182 | ||
e0c93948 | 183 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
fa857afc YH |
184 | { |
185 | #ifdef CONFIG_IPV6_SIT_6RD | |
e0c93948 YH |
186 | struct ip_tunnel *t = netdev_priv(dev); |
187 | ||
79134e6c | 188 | if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { |
fa857afc YH |
189 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); |
190 | t->ip6rd.relay_prefix = 0; | |
191 | t->ip6rd.prefixlen = 16; | |
192 | t->ip6rd.relay_prefixlen = 0; | |
193 | } else { | |
194 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
195 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
196 | } | |
197 | #endif | |
198 | } | |
199 | ||
f3723416 ND |
200 | static int ipip6_tunnel_create(struct net_device *dev) |
201 | { | |
202 | struct ip_tunnel *t = netdev_priv(dev); | |
203 | struct net *net = dev_net(dev); | |
204 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
205 | int err; | |
206 | ||
ebe084aa SK |
207 | memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); |
208 | memcpy(dev->broadcast, &t->parms.iph.daddr, 4); | |
f3723416 | 209 | |
d440b720 | 210 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
f3723416 ND |
211 | dev->priv_flags |= IFF_ISATAP; |
212 | ||
87e57399 TLSC |
213 | dev->rtnl_link_ops = &sit_link_ops; |
214 | ||
f3723416 ND |
215 | err = register_netdevice(dev); |
216 | if (err < 0) | |
217 | goto out; | |
218 | ||
ebe084aa SK |
219 | ipip6_tunnel_clone_6rd(dev, sitn); |
220 | ||
f3723416 ND |
221 | dev_hold(dev); |
222 | ||
223 | ipip6_tunnel_link(sitn, t); | |
224 | return 0; | |
225 | ||
226 | out: | |
227 | return err; | |
228 | } | |
229 | ||
3a43be3c | 230 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 231 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 232 | { |
e69a4adc AV |
233 | __be32 remote = parms->iph.daddr; |
234 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
235 | struct ip_tunnel *t, *nt; |
236 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 237 | struct net_device *dev; |
1da177e4 | 238 | char name[IFNAMSIZ]; |
ca8def14 | 239 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 240 | |
3a43be3c ED |
241 | for (tp = __ipip6_bucket(sitn, parms); |
242 | (t = rtnl_dereference(*tp)) != NULL; | |
243 | tp = &t->next) { | |
8db99e57 | 244 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
245 | remote == t->parms.iph.daddr && |
246 | parms->link == t->parms.link) { | |
8db99e57 SH |
247 | if (create) |
248 | return NULL; | |
249 | else | |
250 | return t; | |
251 | } | |
1da177e4 LT |
252 | } |
253 | if (!create) | |
254 | goto failed; | |
255 | ||
b95211e0 ED |
256 | if (parms->name[0]) { |
257 | if (!dev_valid_name(parms->name)) | |
258 | goto failed; | |
1da177e4 | 259 | strlcpy(name, parms->name, IFNAMSIZ); |
b95211e0 | 260 | } else { |
15fc1f70 | 261 | strcpy(name, "sit%d"); |
b95211e0 | 262 | } |
c835a677 TG |
263 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
264 | ipip6_tunnel_setup); | |
63159f29 | 265 | if (!dev) |
1da177e4 LT |
266 | return NULL; |
267 | ||
7a97146c PE |
268 | dev_net_set(dev, net); |
269 | ||
2941a486 | 270 | nt = netdev_priv(dev); |
1326c3d5 | 271 | |
1da177e4 | 272 | nt->parms = *parms; |
f3723416 | 273 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 274 | goto failed_free; |
1da177e4 | 275 | |
1da177e4 LT |
276 | return nt; |
277 | ||
b37d428b | 278 | failed_free: |
cf124db5 | 279 | free_netdev(dev); |
1da177e4 LT |
280 | failed: |
281 | return NULL; | |
282 | } | |
283 | ||
ef9a9d11 ED |
284 | #define for_each_prl_rcu(start) \ |
285 | for (prl = rcu_dereference(start); \ | |
286 | prl; \ | |
287 | prl = rcu_dereference(prl->next)) | |
288 | ||
fadf6bf0 | 289 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 290 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 291 | { |
ef9a9d11 | 292 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 293 | |
ef9a9d11 ED |
294 | for_each_prl_rcu(t->prl) |
295 | if (prl->addr == addr) | |
fadf6bf0 | 296 | break; |
ef9a9d11 | 297 | return prl; |
fadf6bf0 TF |
298 | |
299 | } | |
300 | ||
fd5d687b | 301 | static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr) |
300aaeea | 302 | { |
fd5d687b CH |
303 | struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data; |
304 | struct ip_tunnel *t = netdev_priv(dev); | |
2b4743bd | 305 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
306 | struct ip_tunnel_prl_entry *prl; |
307 | unsigned int cmax, c = 0, ca, len; | |
308 | int ret = 0; | |
309 | ||
fd5d687b CH |
310 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) |
311 | return -EINVAL; | |
312 | ||
2b4743bd YH |
313 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
314 | return -EFAULT; | |
315 | cmax = kprl.datalen / sizeof(kprl); | |
316 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
317 | cmax = 1; |
318 | ||
319 | /* For simple GET or for root users, | |
320 | * we try harder to allocate. | |
321 | */ | |
322 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
0ccc22f4 | 323 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
300aaeea YH |
324 | NULL; |
325 | ||
ef9a9d11 | 326 | rcu_read_lock(); |
300aaeea YH |
327 | |
328 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
329 | ||
330 | if (!kp) { | |
331 | /* We don't try hard to allocate much memory for | |
332 | * non-root users. | |
333 | * For root users, retry allocating enough memory for | |
334 | * the answer. | |
335 | */ | |
336 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
337 | if (!kp) { | |
338 | ret = -ENOMEM; | |
339 | goto out; | |
340 | } | |
341 | } | |
342 | ||
343 | c = 0; | |
ef9a9d11 | 344 | for_each_prl_rcu(t->prl) { |
298bf12d | 345 | if (c >= cmax) |
300aaeea | 346 | break; |
2b4743bd | 347 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
348 | continue; |
349 | kp[c].addr = prl->addr; | |
350 | kp[c].flags = prl->flags; | |
351 | c++; | |
2b4743bd | 352 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
353 | break; |
354 | } | |
355 | out: | |
ef9a9d11 | 356 | rcu_read_unlock(); |
300aaeea YH |
357 | |
358 | len = sizeof(*kp) * c; | |
2b4743bd YH |
359 | ret = 0; |
360 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
361 | ret = -EFAULT; | |
300aaeea YH |
362 | |
363 | kfree(kp); | |
300aaeea | 364 | |
2b4743bd | 365 | return ret; |
300aaeea YH |
366 | } |
367 | ||
fadf6bf0 TF |
368 | static int |
369 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
370 | { | |
371 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
372 | int err = 0; |
373 | ||
0009ae1f YH |
374 | if (a->addr == htonl(INADDR_ANY)) |
375 | return -EINVAL; | |
376 | ||
aac4dddc | 377 | ASSERT_RTNL(); |
fadf6bf0 | 378 | |
3a43be3c | 379 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 380 | if (p->addr == a->addr) { |
ef9a9d11 ED |
381 | if (chg) { |
382 | p->flags = a->flags; | |
383 | goto out; | |
384 | } | |
3fcfa129 YH |
385 | err = -EEXIST; |
386 | goto out; | |
fadf6bf0 TF |
387 | } |
388 | } | |
389 | ||
3fcfa129 YH |
390 | if (chg) { |
391 | err = -ENXIO; | |
392 | goto out; | |
393 | } | |
fadf6bf0 TF |
394 | |
395 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
396 | if (!p) { |
397 | err = -ENOBUFS; | |
398 | goto out; | |
399 | } | |
fadf6bf0 | 400 | |
fadf6bf0 | 401 | p->next = t->prl; |
300aaeea YH |
402 | p->addr = a->addr; |
403 | p->flags = a->flags; | |
ef9a9d11 | 404 | t->prl_count++; |
cf778b00 | 405 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 406 | out: |
3fcfa129 | 407 | return err; |
fadf6bf0 TF |
408 | } |
409 | ||
ef9a9d11 ED |
410 | static void prl_list_destroy_rcu(struct rcu_head *head) |
411 | { | |
412 | struct ip_tunnel_prl_entry *p, *n; | |
413 | ||
414 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
415 | do { | |
753ea8e9 | 416 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
417 | kfree(p); |
418 | p = n; | |
419 | } while (p); | |
420 | } | |
421 | ||
fadf6bf0 TF |
422 | static int |
423 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
424 | { | |
753ea8e9 ED |
425 | struct ip_tunnel_prl_entry *x; |
426 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
427 | int err = 0; |
428 | ||
aac4dddc | 429 | ASSERT_RTNL(); |
fadf6bf0 | 430 | |
0009ae1f | 431 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
432 | for (p = &t->prl; |
433 | (x = rtnl_dereference(*p)) != NULL; | |
434 | p = &x->next) { | |
435 | if (x->addr == a->addr) { | |
fadf6bf0 | 436 | *p = x->next; |
11c476f3 | 437 | kfree_rcu(x, rcu_head); |
300aaeea | 438 | t->prl_count--; |
3fcfa129 | 439 | goto out; |
fadf6bf0 TF |
440 | } |
441 | } | |
3fcfa129 | 442 | err = -ENXIO; |
fadf6bf0 | 443 | } else { |
753ea8e9 ED |
444 | x = rtnl_dereference(t->prl); |
445 | if (x) { | |
ef9a9d11 | 446 | t->prl_count = 0; |
ef9a9d11 ED |
447 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
448 | t->prl = NULL; | |
fadf6bf0 TF |
449 | } |
450 | } | |
3fcfa129 | 451 | out: |
4b279601 | 452 | return err; |
fadf6bf0 TF |
453 | } |
454 | ||
fd5d687b CH |
455 | static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, |
456 | int cmd) | |
457 | { | |
458 | struct ip_tunnel *t = netdev_priv(dev); | |
459 | struct ip_tunnel_prl prl; | |
460 | int err; | |
461 | ||
462 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) | |
463 | return -EPERM; | |
464 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) | |
465 | return -EINVAL; | |
466 | ||
467 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
468 | return -EFAULT; | |
469 | ||
470 | switch (cmd) { | |
471 | case SIOCDELPRL: | |
472 | err = ipip6_tunnel_del_prl(t, &prl); | |
473 | break; | |
474 | case SIOCADDPRL: | |
475 | case SIOCCHGPRL: | |
476 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
477 | break; | |
478 | } | |
479 | dst_cache_reset(&t->dst_cache); | |
480 | netdev_state_change(dev); | |
481 | return err; | |
482 | } | |
483 | ||
fadf6bf0 | 484 | static int |
b71d1d42 | 485 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 486 | { |
3fcfa129 | 487 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
488 | int ok = 1; |
489 | ||
ef9a9d11 | 490 | rcu_read_lock(); |
3fcfa129 | 491 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 492 | if (p) { |
300aaeea | 493 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
494 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
495 | else | |
496 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
497 | } else { | |
b71d1d42 ED |
498 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
499 | ||
fadf6bf0 TF |
500 | if (ipv6_addr_is_isatap(addr6) && |
501 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 502 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
503 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
504 | else | |
505 | ok = 0; | |
506 | } | |
ef9a9d11 | 507 | rcu_read_unlock(); |
fadf6bf0 TF |
508 | return ok; |
509 | } | |
510 | ||
1da177e4 LT |
511 | static void ipip6_tunnel_uninit(struct net_device *dev) |
512 | { | |
5e6700b3 ND |
513 | struct ip_tunnel *tunnel = netdev_priv(dev); |
514 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 515 | |
cd3dbc19 | 516 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 517 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 518 | } else { |
5e6700b3 ND |
519 | ipip6_tunnel_unlink(sitn, tunnel); |
520 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 521 | } |
e09acddf | 522 | dst_cache_reset(&tunnel->dst_cache); |
3a43be3c | 523 | dev_put(dev); |
1da177e4 LT |
524 | } |
525 | ||
c73cb5a2 | 526 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 527 | { |
b71d1d42 | 528 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
529 | const int type = icmp_hdr(skb)->type; |
530 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 531 | unsigned int data_len = 0; |
1da177e4 | 532 | struct ip_tunnel *t; |
3051fbec | 533 | int sifindex; |
c73cb5a2 | 534 | int err; |
1da177e4 LT |
535 | |
536 | switch (type) { | |
537 | default: | |
538 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 539 | return 0; |
1da177e4 LT |
540 | |
541 | case ICMP_DEST_UNREACH: | |
542 | switch (code) { | |
543 | case ICMP_SR_FAILED: | |
1da177e4 | 544 | /* Impossible event. */ |
c73cb5a2 | 545 | return 0; |
1da177e4 LT |
546 | default: |
547 | /* All others are translated to HOST_UNREACH. | |
548 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
549 | I believe they are just ether pollution. --ANK | |
550 | */ | |
551 | break; | |
552 | } | |
553 | break; | |
554 | case ICMP_TIME_EXCEEDED: | |
555 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 556 | return 0; |
20e1954f | 557 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 558 | break; |
ec18d9a2 DM |
559 | case ICMP_REDIRECT: |
560 | break; | |
1da177e4 LT |
561 | } |
562 | ||
c73cb5a2 KM |
563 | err = -ENOENT; |
564 | ||
3051fbec DA |
565 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
566 | t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
567 | iph->daddr, iph->saddr, sifindex); | |
63159f29 | 568 | if (!t) |
36393395 DM |
569 | goto out; |
570 | ||
571 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
572 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d888f396 | 573 | t->parms.link, iph->protocol); |
36393395 DM |
574 | err = 0; |
575 | goto out; | |
576 | } | |
ec18d9a2 | 577 | if (type == ICMP_REDIRECT) { |
1042caa7 MŻ |
578 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, |
579 | iph->protocol); | |
ec18d9a2 DM |
580 | err = 0; |
581 | goto out; | |
582 | } | |
36393395 | 583 | |
2d7a3b27 | 584 | err = 0; |
173656ac HL |
585 | if (__in6_dev_get(skb->dev) && |
586 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) | |
1da177e4 | 587 | goto out; |
c73cb5a2 | 588 | |
2d7a3b27 | 589 | if (t->parms.iph.daddr == 0) |
ca15a078 OG |
590 | goto out; |
591 | ||
1da177e4 LT |
592 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
593 | goto out; | |
594 | ||
bb80087a | 595 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
596 | t->err_count++; |
597 | else | |
598 | t->err_count = 1; | |
599 | t->err_time = jiffies; | |
600 | out: | |
c73cb5a2 | 601 | return err; |
1da177e4 LT |
602 | } |
603 | ||
218774dc HFS |
604 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
605 | const struct in6_addr *v6addr) | |
606 | { | |
607 | __be32 v4embed = 0; | |
608 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
609 | return true; | |
610 | return false; | |
611 | } | |
612 | ||
7df37ff3 CB |
613 | /* Checks if an address matches an address on the tunnel interface. |
614 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
615 | * Long story: | |
616 | * This function is called after we considered the packet as spoofed | |
617 | * in is_spoofed_6rd. | |
618 | * We may have a router that is doing NAT for proto 41 packets | |
619 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
620 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
621 | * function will return true, dropping the packet. | |
622 | * But, we can still check if is spoofed against the IP | |
623 | * addresses associated with the interface. | |
624 | */ | |
625 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
626 | const struct in6_addr *v6dst) | |
627 | { | |
628 | int prefix_len; | |
629 | ||
630 | #ifdef CONFIG_IPV6_SIT_6RD | |
631 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
632 | - tunnel->ip6rd.relay_prefixlen; | |
633 | #else | |
634 | prefix_len = 48; | |
635 | #endif | |
636 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
637 | } | |
638 | ||
639 | /* Returns true if a packet is spoofed */ | |
640 | static bool packet_is_spoofed(struct sk_buff *skb, | |
641 | const struct iphdr *iph, | |
642 | struct ip_tunnel *tunnel) | |
643 | { | |
644 | const struct ipv6hdr *ipv6h; | |
645 | ||
646 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
647 | if (!isatap_chksrc(skb, iph, tunnel)) | |
648 | return true; | |
649 | ||
650 | return false; | |
651 | } | |
652 | ||
653 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
654 | return false; | |
655 | ||
656 | ipv6h = ipv6_hdr(skb); | |
657 | ||
658 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
659 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
660 | &iph->saddr, &ipv6h->saddr, | |
661 | &iph->daddr, &ipv6h->daddr); | |
662 | return true; | |
663 | } | |
664 | ||
665 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
666 | return false; | |
667 | ||
668 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
669 | return false; | |
670 | ||
671 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
672 | &iph->saddr, &ipv6h->saddr, | |
673 | &iph->daddr, &ipv6h->daddr); | |
674 | return true; | |
675 | } | |
676 | ||
1da177e4 LT |
677 | static int ipip6_rcv(struct sk_buff *skb) |
678 | { | |
1ad759d8 | 679 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 680 | struct ip_tunnel *tunnel; |
3051fbec | 681 | int sifindex; |
f4e0b4c5 | 682 | int err; |
1da177e4 | 683 | |
3051fbec | 684 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
4fddbf5d | 685 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 686 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 687 | if (tunnel) { |
8f84985f | 688 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 689 | |
32b8a8e5 ND |
690 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
691 | tunnel->parms.iph.protocol != 0) | |
692 | goto out; | |
693 | ||
b0e380b1 | 694 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 695 | skb_reset_network_header(skb); |
8cdfab8a | 696 | IPCB(skb)->flags = 0; |
a09a4c8d | 697 | skb->dev = tunnel->dev; |
c7dc89c0 | 698 | |
7df37ff3 CB |
699 | if (packet_is_spoofed(skb, iph, tunnel)) { |
700 | tunnel->dev->stats.rx_errors++; | |
701 | goto out; | |
f4e0b4c5 ND |
702 | } |
703 | ||
a09a4c8d JG |
704 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
705 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
706 | goto out; | |
f4e0b4c5 | 707 | |
bb9bd814 LB |
708 | /* skb can be uncloned in iptunnel_pull_header, so |
709 | * old iph is no longer valid | |
710 | */ | |
711 | iph = (const struct iphdr *)skb_mac_header(skb); | |
f4e0b4c5 ND |
712 | err = IP_ECN_decapsulate(iph, skb); |
713 | if (unlikely(err)) { | |
714 | if (log_ecn_error) | |
715 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
716 | &iph->saddr, iph->tos); | |
717 | if (err > 1) { | |
718 | ++tunnel->dev->stats.rx_frame_errors; | |
719 | ++tunnel->dev->stats.rx_errors; | |
720 | goto out; | |
721 | } | |
c7dc89c0 | 722 | } |
d19d56dd | 723 | |
15fc1f70 | 724 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 725 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
726 | tstats->rx_packets++; |
727 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 728 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 729 | |
caf586e5 | 730 | netif_rx(skb); |
8990f468 | 731 | |
1da177e4 LT |
732 | return 0; |
733 | } | |
734 | ||
6dcdd1b3 | 735 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 736 | return 1; |
1da177e4 | 737 | out: |
36ca34cc | 738 | kfree_skb(skb); |
1da177e4 LT |
739 | return 0; |
740 | } | |
741 | ||
49dbe7ae | 742 | static const struct tnl_ptk_info ipip_tpi = { |
32b8a8e5 ND |
743 | /* no tunnel info required for ipip. */ |
744 | .proto = htons(ETH_P_IP), | |
745 | }; | |
746 | ||
49dbe7ae SH |
747 | #if IS_ENABLED(CONFIG_MPLS) |
748 | static const struct tnl_ptk_info mplsip_tpi = { | |
749 | /* no tunnel info required for mplsip. */ | |
750 | .proto = htons(ETH_P_MPLS_UC), | |
751 | }; | |
752 | #endif | |
753 | ||
754 | static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
32b8a8e5 | 755 | { |
3d7b46cd | 756 | const struct iphdr *iph; |
32b8a8e5 | 757 | struct ip_tunnel *tunnel; |
3051fbec DA |
758 | int sifindex; |
759 | ||
760 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; | |
32b8a8e5 | 761 | |
3d7b46cd | 762 | iph = ip_hdr(skb); |
32b8a8e5 | 763 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 764 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 765 | if (tunnel) { |
49dbe7ae SH |
766 | const struct tnl_ptk_info *tpi; |
767 | ||
768 | if (tunnel->parms.iph.protocol != ipproto && | |
32b8a8e5 ND |
769 | tunnel->parms.iph.protocol != 0) |
770 | goto drop; | |
771 | ||
772 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
773 | goto drop; | |
49dbe7ae SH |
774 | #if IS_ENABLED(CONFIG_MPLS) |
775 | if (ipproto == IPPROTO_MPLS) | |
776 | tpi = &mplsip_tpi; | |
777 | else | |
778 | #endif | |
779 | tpi = &ipip_tpi; | |
780 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 781 | goto drop; |
49dbe7ae | 782 | return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
32b8a8e5 ND |
783 | } |
784 | ||
785 | return 1; | |
786 | ||
787 | drop: | |
788 | kfree_skb(skb); | |
789 | return 0; | |
790 | } | |
791 | ||
49dbe7ae SH |
792 | static int ipip_rcv(struct sk_buff *skb) |
793 | { | |
794 | return sit_tunnel_rcv(skb, IPPROTO_IPIP); | |
795 | } | |
796 | ||
797 | #if IS_ENABLED(CONFIG_MPLS) | |
798 | static int mplsip_rcv(struct sk_buff *skb) | |
799 | { | |
800 | return sit_tunnel_rcv(skb, IPPROTO_MPLS); | |
801 | } | |
802 | #endif | |
803 | ||
fa857afc | 804 | /* |
218774dc HFS |
805 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
806 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 807 | */ |
218774dc HFS |
808 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
809 | __be32 *v4dst) | |
1da177e4 | 810 | { |
fa857afc YH |
811 | #ifdef CONFIG_IPV6_SIT_6RD |
812 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
813 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 814 | unsigned int pbw0, pbi0; |
fa857afc YH |
815 | int pbi1; |
816 | u32 d; | |
817 | ||
818 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
819 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
820 | ||
a843dc4e ML |
821 | d = tunnel->ip6rd.relay_prefixlen < 32 ? |
822 | (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
823 | tunnel->ip6rd.relay_prefixlen : 0; | |
fa857afc YH |
824 | |
825 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
826 | if (pbi1 > 0) | |
e7db38c3 | 827 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
828 | (32 - pbi1); |
829 | ||
218774dc HFS |
830 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
831 | return true; | |
fa857afc YH |
832 | } |
833 | #else | |
1da177e4 | 834 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 835 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
836 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
837 | return true; | |
1da177e4 | 838 | } |
fa857afc | 839 | #endif |
218774dc HFS |
840 | return false; |
841 | } | |
842 | ||
843 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
844 | const struct in6_addr *v6dst) | |
845 | { | |
846 | __be32 dst = 0; | |
847 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
848 | return dst; |
849 | } | |
850 | ||
851 | /* | |
852 | * This function assumes it is being called from dev_queue_xmit() | |
853 | * and that skb is filled properly by that function. | |
854 | */ | |
855 | ||
6fef4c0c SH |
856 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
857 | struct net_device *dev) | |
1da177e4 | 858 | { |
2941a486 | 859 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
860 | const struct iphdr *tiph = &tunnel->parms.iph; |
861 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 862 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 863 | __be16 df = tiph->frag_off; |
67ba4152 IM |
864 | struct rtable *rt; /* Route to the other host */ |
865 | struct net_device *tdev; /* Device to other host */ | |
866 | unsigned int max_headroom; /* The extra header space needed */ | |
e69a4adc | 867 | __be32 dst = tiph->daddr; |
31e4543d | 868 | struct flowi4 fl4; |
1da177e4 | 869 | int mtu; |
b71d1d42 | 870 | const struct in6_addr *addr6; |
1da177e4 | 871 | int addr_type; |
0e6fbc5b | 872 | u8 ttl; |
14909664 TH |
873 | u8 protocol = IPPROTO_IPV6; |
874 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1da177e4 | 875 | |
c2bceb3d LEM |
876 | if (tos == 1) |
877 | tos = ipv6_get_dsfield(iph6); | |
878 | ||
c7dc89c0 FT |
879 | /* ISATAP (RFC4214) - must come before 6to4 */ |
880 | if (dev->priv_flags & IFF_ISATAP) { | |
881 | struct neighbour *neigh = NULL; | |
1e2927b0 | 882 | bool do_tx_error = false; |
c7dc89c0 | 883 | |
adf30907 | 884 | if (skb_dst(skb)) |
1e2927b0 | 885 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 | 886 | |
63159f29 | 887 | if (!neigh) { |
7df37ff3 | 888 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
889 | goto tx_error; |
890 | } | |
891 | ||
3e866703 | 892 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
893 | addr_type = ipv6_addr_type(addr6); |
894 | ||
895 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
896 | ipv6_addr_is_isatap(addr6)) | |
897 | dst = addr6->s6_addr32[3]; | |
898 | else | |
1e2927b0 DM |
899 | do_tx_error = true; |
900 | ||
901 | neigh_release(neigh); | |
902 | if (do_tx_error) | |
c7dc89c0 FT |
903 | goto tx_error; |
904 | } | |
905 | ||
1da177e4 | 906 | if (!dst) |
218774dc | 907 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
908 | |
909 | if (!dst) { | |
910 | struct neighbour *neigh = NULL; | |
1e2927b0 | 911 | bool do_tx_error = false; |
1da177e4 | 912 | |
adf30907 | 913 | if (skb_dst(skb)) |
1e2927b0 | 914 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 | 915 | |
63159f29 | 916 | if (!neigh) { |
7df37ff3 | 917 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
918 | goto tx_error; |
919 | } | |
920 | ||
3e866703 | 921 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
922 | addr_type = ipv6_addr_type(addr6); |
923 | ||
924 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 925 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
926 | addr_type = ipv6_addr_type(addr6); |
927 | } | |
928 | ||
1e2927b0 DM |
929 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
930 | dst = addr6->s6_addr32[3]; | |
931 | else | |
932 | do_tx_error = true; | |
1da177e4 | 933 | |
1e2927b0 DM |
934 | neigh_release(neigh); |
935 | if (do_tx_error) | |
936 | goto tx_error; | |
1da177e4 LT |
937 | } |
938 | ||
9830ad4c CG |
939 | flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
940 | RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, | |
941 | 0, dst, tiph->saddr, 0, 0, | |
942 | sock_net_uid(tunnel->net, NULL)); | |
9830ad4c | 943 | |
6e3d1bbb HY |
944 | rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); |
945 | if (!rt) { | |
946 | rt = ip_route_output_flow(tunnel->net, &fl4, NULL); | |
947 | if (IS_ERR(rt)) { | |
948 | dev->stats.tx_carrier_errors++; | |
949 | goto tx_error_icmp; | |
950 | } | |
951 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); | |
1da177e4 | 952 | } |
6e3d1bbb | 953 | |
1da177e4 LT |
954 | if (rt->rt_type != RTN_UNICAST) { |
955 | ip_rt_put(rt); | |
15fc1f70 | 956 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
957 | goto tx_error_icmp; |
958 | } | |
d8d1f30b | 959 | tdev = rt->dst.dev; |
1da177e4 LT |
960 | |
961 | if (tdev == dev) { | |
962 | ip_rt_put(rt); | |
15fc1f70 | 963 | dev->stats.collisions++; |
1da177e4 LT |
964 | goto tx_error; |
965 | } | |
966 | ||
7e13318d | 967 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
14909664 | 968 | ip_rt_put(rt); |
aed069df | 969 | goto tx_error; |
14909664 TH |
970 | } |
971 | ||
292f4f3c | 972 | if (df) { |
14909664 | 973 | mtu = dst_mtu(&rt->dst) - t_hlen; |
1da177e4 | 974 | |
292f4f3c | 975 | if (mtu < 68) { |
15fc1f70 | 976 | dev->stats.collisions++; |
292f4f3c HX |
977 | ip_rt_put(rt); |
978 | goto tx_error; | |
979 | } | |
1da177e4 | 980 | |
292f4f3c HX |
981 | if (mtu < IPV6_MIN_MTU) { |
982 | mtu = IPV6_MIN_MTU; | |
983 | df = 0; | |
984 | } | |
985 | ||
f15ca723 | 986 | if (tunnel->parms.iph.daddr) |
4d42df46 | 987 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
292f4f3c | 988 | |
58a47824 | 989 | if (skb->len > mtu && !skb_is_gso(skb)) { |
3ffe533c | 990 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
991 | ip_rt_put(rt); |
992 | goto tx_error; | |
993 | } | |
1da177e4 LT |
994 | } |
995 | ||
996 | if (tunnel->err_count > 0) { | |
bb80087a WY |
997 | if (time_before(jiffies, |
998 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
999 | tunnel->err_count--; |
1000 | dst_link_failure(skb); | |
1001 | } else | |
1002 | tunnel->err_count = 0; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Okay, now see if we can stuff it in the buffer as-is. | |
1007 | */ | |
14909664 | 1008 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; |
1da177e4 | 1009 | |
cfbba49d PM |
1010 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1011 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
1012 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
1013 | if (!new_skb) { | |
1014 | ip_rt_put(rt); | |
15fc1f70 | 1015 | dev->stats.tx_dropped++; |
66028310 | 1016 | kfree_skb(skb); |
6ed10654 | 1017 | return NETDEV_TX_OK; |
1da177e4 LT |
1018 | } |
1019 | if (skb->sk) | |
1020 | skb_set_owner_w(new_skb, skb->sk); | |
1021 | dev_kfree_skb(skb); | |
1022 | skb = new_skb; | |
0660e03f | 1023 | iph6 = ipv6_hdr(skb); |
1da177e4 | 1024 | } |
0e6fbc5b PS |
1025 | ttl = tiph->ttl; |
1026 | if (ttl == 0) | |
1027 | ttl = iph6->hop_limit; | |
1028 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 1029 | |
14909664 | 1030 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
6a9eadcc | 1031 | ip_rt_put(rt); |
14909664 | 1032 | goto tx_error; |
6a9eadcc | 1033 | } |
3d483058 | 1034 | |
469471cd TH |
1035 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
1036 | ||
039f5062 PS |
1037 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
1038 | df, !net_eq(tunnel->net, dev_net(dev))); | |
6ed10654 | 1039 | return NETDEV_TX_OK; |
1da177e4 LT |
1040 | |
1041 | tx_error_icmp: | |
1042 | dst_link_failure(skb); | |
1043 | tx_error: | |
66028310 | 1044 | kfree_skb(skb); |
61c1db7f | 1045 | dev->stats.tx_errors++; |
6ed10654 | 1046 | return NETDEV_TX_OK; |
1da177e4 LT |
1047 | } |
1048 | ||
49dbe7ae SH |
1049 | static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
1050 | struct net_device *dev, u8 ipproto) | |
32b8a8e5 ND |
1051 | { |
1052 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1053 | const struct iphdr *tiph = &tunnel->parms.iph; | |
1054 | ||
7e13318d | 1055 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 1056 | goto tx_error; |
32b8a8e5 | 1057 | |
49dbe7ae | 1058 | skb_set_inner_ipproto(skb, ipproto); |
469471cd | 1059 | |
49dbe7ae | 1060 | ip_tunnel_xmit(skb, dev, tiph, ipproto); |
32b8a8e5 | 1061 | return NETDEV_TX_OK; |
aed069df AD |
1062 | tx_error: |
1063 | kfree_skb(skb); | |
61c1db7f ED |
1064 | dev->stats.tx_errors++; |
1065 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1066 | } |
1067 | ||
1068 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1069 | struct net_device *dev) | |
1070 | { | |
cb9f1b78 WB |
1071 | if (!pskb_inet_may_pull(skb)) |
1072 | goto tx_err; | |
1073 | ||
32b8a8e5 ND |
1074 | switch (skb->protocol) { |
1075 | case htons(ETH_P_IP): | |
49dbe7ae | 1076 | sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
32b8a8e5 ND |
1077 | break; |
1078 | case htons(ETH_P_IPV6): | |
1079 | ipip6_tunnel_xmit(skb, dev); | |
1080 | break; | |
49dbe7ae SH |
1081 | #if IS_ENABLED(CONFIG_MPLS) |
1082 | case htons(ETH_P_MPLS_UC): | |
1083 | sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); | |
1084 | break; | |
1085 | #endif | |
32b8a8e5 ND |
1086 | default: |
1087 | goto tx_err; | |
1088 | } | |
1089 | ||
1090 | return NETDEV_TX_OK; | |
1091 | ||
1092 | tx_err: | |
1093 | dev->stats.tx_errors++; | |
66028310 | 1094 | kfree_skb(skb); |
32b8a8e5 ND |
1095 | return NETDEV_TX_OK; |
1096 | ||
1097 | } | |
1098 | ||
8a4a50f9 MS |
1099 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1100 | { | |
1101 | struct net_device *tdev = NULL; | |
1102 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1103 | const struct iphdr *iph; |
31e4543d | 1104 | struct flowi4 fl4; |
8a4a50f9 MS |
1105 | |
1106 | tunnel = netdev_priv(dev); | |
1107 | iph = &tunnel->parms.iph; | |
1108 | ||
1109 | if (iph->daddr) { | |
5e6700b3 ND |
1110 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1111 | NULL, | |
78fbfd8a DM |
1112 | iph->daddr, iph->saddr, |
1113 | 0, 0, | |
1114 | IPPROTO_IPV6, | |
1115 | RT_TOS(iph->tos), | |
1116 | tunnel->parms.link); | |
b23dd4fe DM |
1117 | |
1118 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1119 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1120 | ip_rt_put(rt); |
1121 | } | |
1122 | dev->flags |= IFF_POINTOPOINT; | |
1123 | } | |
1124 | ||
1125 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1126 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 | 1127 | |
ff6ab32b | 1128 | if (tdev && !netif_is_l3_master(tdev)) { |
14909664 TH |
1129 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1130 | ||
8a4a50f9 | 1131 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
14909664 | 1132 | dev->mtu = tdev->mtu - t_hlen; |
8a4a50f9 MS |
1133 | if (dev->mtu < IPV6_MIN_MTU) |
1134 | dev->mtu = IPV6_MIN_MTU; | |
1135 | } | |
8a4a50f9 MS |
1136 | } |
1137 | ||
9830ad4c CG |
1138 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
1139 | __u32 fwmark) | |
f3723416 | 1140 | { |
5e6700b3 | 1141 | struct net *net = t->net; |
f3723416 ND |
1142 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1143 | ||
1144 | ipip6_tunnel_unlink(sitn, t); | |
1145 | synchronize_net(); | |
1146 | t->parms.iph.saddr = p->iph.saddr; | |
1147 | t->parms.iph.daddr = p->iph.daddr; | |
1148 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1149 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1150 | ipip6_tunnel_link(sitn, t); | |
1151 | t->parms.iph.ttl = p->iph.ttl; | |
1152 | t->parms.iph.tos = p->iph.tos; | |
f859b4af | 1153 | t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c | 1154 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
f3723416 | 1155 | t->parms.link = p->link; |
9830ad4c | 1156 | t->fwmark = fwmark; |
f3723416 ND |
1157 | ipip6_tunnel_bind_dev(t->dev); |
1158 | } | |
e09acddf | 1159 | dst_cache_reset(&t->dst_cache); |
f3723416 ND |
1160 | netdev_state_change(t->dev); |
1161 | } | |
1162 | ||
e2f1f072 ND |
1163 | #ifdef CONFIG_IPV6_SIT_6RD |
1164 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1165 | struct ip_tunnel_6rd *ip6rd) | |
1166 | { | |
1167 | struct in6_addr prefix; | |
1168 | __be32 relay_prefix; | |
1169 | ||
1170 | if (ip6rd->relay_prefixlen > 32 || | |
1171 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1172 | return -EINVAL; | |
1173 | ||
1174 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1175 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1176 | return -EINVAL; | |
1177 | if (ip6rd->relay_prefixlen) | |
1178 | relay_prefix = ip6rd->relay_prefix & | |
1179 | htonl(0xffffffffUL << | |
1180 | (32 - ip6rd->relay_prefixlen)); | |
1181 | else | |
1182 | relay_prefix = 0; | |
1183 | if (relay_prefix != ip6rd->relay_prefix) | |
1184 | return -EINVAL; | |
1185 | ||
1186 | t->ip6rd.prefix = prefix; | |
1187 | t->ip6rd.relay_prefix = relay_prefix; | |
1188 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1189 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
e09acddf | 1190 | dst_cache_reset(&t->dst_cache); |
e2f1f072 ND |
1191 | netdev_state_change(t->dev); |
1192 | return 0; | |
1193 | } | |
fd5d687b CH |
1194 | |
1195 | static int | |
1196 | ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) | |
1197 | { | |
1198 | struct ip_tunnel *t = netdev_priv(dev); | |
1199 | struct ip_tunnel_6rd ip6rd; | |
1200 | struct ip_tunnel_parm p; | |
1201 | ||
1202 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { | |
1203 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1204 | return -EFAULT; | |
1205 | t = ipip6_tunnel_locate(t->net, &p, 0); | |
1206 | } | |
1207 | if (!t) | |
1208 | t = netdev_priv(dev); | |
1209 | ||
1210 | ip6rd.prefix = t->ip6rd.prefix; | |
1211 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
1212 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1213 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1214 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) | |
1215 | return -EFAULT; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | static int | |
1220 | ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1221 | { | |
1222 | struct ip_tunnel *t = netdev_priv(dev); | |
1223 | struct ip_tunnel_6rd ip6rd; | |
1224 | int err; | |
1225 | ||
1226 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) | |
1227 | return -EPERM; | |
1228 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd))) | |
1229 | return -EFAULT; | |
1230 | ||
1231 | if (cmd != SIOCDEL6RD) { | |
1232 | err = ipip6_tunnel_update_6rd(t, &ip6rd); | |
1233 | if (err < 0) | |
1234 | return err; | |
1235 | } else | |
1236 | ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | #endif /* CONFIG_IPV6_SIT_6RD */ | |
e2f1f072 | 1241 | |
03ff4979 | 1242 | static bool ipip6_valid_ip_proto(u8 ipproto) |
49dbe7ae SH |
1243 | { |
1244 | return ipproto == IPPROTO_IPV6 || | |
1245 | ipproto == IPPROTO_IPIP || | |
1246 | #if IS_ENABLED(CONFIG_MPLS) | |
1247 | ipproto == IPPROTO_MPLS || | |
1248 | #endif | |
1249 | ipproto == 0; | |
1250 | } | |
1251 | ||
1da177e4 | 1252 | static int |
fd5d687b | 1253 | __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) |
1da177e4 | 1254 | { |
fd5d687b CH |
1255 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1256 | return -EPERM; | |
1257 | ||
1258 | if (!ipip6_valid_ip_proto(p->iph.protocol)) | |
1259 | return -EINVAL; | |
1260 | if (p->iph.version != 4 || | |
1261 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) | |
1262 | return -EINVAL; | |
1263 | ||
1264 | if (p->iph.ttl) | |
1265 | p->iph.frag_off |= htons(IP_DF); | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static int | |
f60fe2df | 1270 | ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1271 | { |
1272 | struct ip_tunnel *t = netdev_priv(dev); | |
fd5d687b | 1273 | |
f60fe2df CH |
1274 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) |
1275 | t = ipip6_tunnel_locate(t->net, p, 0); | |
fd5d687b CH |
1276 | if (!t) |
1277 | t = netdev_priv(dev); | |
f60fe2df | 1278 | memcpy(p, &t->parms, sizeof(*p)); |
fd5d687b CH |
1279 | return 0; |
1280 | } | |
1281 | ||
1282 | static int | |
f60fe2df | 1283 | ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b | 1284 | { |
9aad77c3 | 1285 | struct ip_tunnel *t = netdev_priv(dev); |
fd5d687b | 1286 | int err; |
1da177e4 | 1287 | |
f60fe2df | 1288 | err = __ipip6_tunnel_ioctl_validate(t->net, p); |
fd5d687b CH |
1289 | if (err) |
1290 | return err; | |
fa857afc | 1291 | |
f60fe2df | 1292 | t = ipip6_tunnel_locate(t->net, p, 1); |
fd5d687b CH |
1293 | if (!t) |
1294 | return -ENOBUFS; | |
fd5d687b CH |
1295 | return 0; |
1296 | } | |
1297 | ||
1298 | static int | |
f60fe2df | 1299 | ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1300 | { |
1301 | struct ip_tunnel *t = netdev_priv(dev); | |
fd5d687b CH |
1302 | int err; |
1303 | ||
f60fe2df | 1304 | err = __ipip6_tunnel_ioctl_validate(t->net, p); |
fd5d687b CH |
1305 | if (err) |
1306 | return err; | |
1307 | ||
f60fe2df | 1308 | t = ipip6_tunnel_locate(t->net, p, 0); |
fd5d687b CH |
1309 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { |
1310 | if (!t) | |
1311 | return -ENOENT; | |
1312 | } else { | |
1313 | if (t) { | |
1314 | if (t->dev != dev) | |
1315 | return -EEXIST; | |
fa857afc | 1316 | } else { |
f60fe2df CH |
1317 | if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || |
1318 | (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) | |
fd5d687b CH |
1319 | return -EINVAL; |
1320 | t = netdev_priv(dev); | |
fa857afc | 1321 | } |
1da177e4 | 1322 | |
f60fe2df | 1323 | ipip6_tunnel_update(t, p, t->fwmark); |
fd5d687b | 1324 | } |
1da177e4 | 1325 | |
fd5d687b CH |
1326 | return 0; |
1327 | } | |
f9cd5a55 | 1328 | |
fd5d687b | 1329 | static int |
f60fe2df | 1330 | ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1331 | { |
1332 | struct ip_tunnel *t = netdev_priv(dev); | |
1da177e4 | 1333 | |
fd5d687b CH |
1334 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) |
1335 | return -EPERM; | |
1da177e4 | 1336 | |
fd5d687b | 1337 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { |
f60fe2df | 1338 | t = ipip6_tunnel_locate(t->net, p, 0); |
fd5d687b CH |
1339 | if (!t) |
1340 | return -ENOENT; | |
1341 | if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) | |
1342 | return -EPERM; | |
1343 | dev = t->dev; | |
1344 | } | |
1345 | unregister_netdevice(dev); | |
1346 | return 0; | |
1347 | } | |
1da177e4 | 1348 | |
f60fe2df CH |
1349 | static int |
1350 | ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
1351 | { | |
1352 | switch (cmd) { | |
1353 | case SIOCGETTUNNEL: | |
1354 | return ipip6_tunnel_get(dev, p); | |
1355 | case SIOCADDTUNNEL: | |
1356 | return ipip6_tunnel_add(dev, p); | |
1357 | case SIOCCHGTUNNEL: | |
1358 | return ipip6_tunnel_change(dev, p); | |
1359 | case SIOCDELTUNNEL: | |
1360 | return ipip6_tunnel_del(dev, p); | |
1361 | default: | |
1362 | return -EINVAL; | |
1363 | } | |
1364 | } | |
1365 | ||
fd5d687b CH |
1366 | static int |
1367 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1368 | { | |
1369 | switch (cmd) { | |
1370 | case SIOCGETTUNNEL: | |
fd5d687b | 1371 | case SIOCADDTUNNEL: |
fd5d687b | 1372 | case SIOCCHGTUNNEL: |
fd5d687b | 1373 | case SIOCDELTUNNEL: |
f60fe2df | 1374 | return ip_tunnel_ioctl(dev, ifr, cmd); |
300aaeea | 1375 | case SIOCGETPRL: |
fd5d687b | 1376 | return ipip6_tunnel_get_prl(dev, ifr); |
fadf6bf0 TF |
1377 | case SIOCADDPRL: |
1378 | case SIOCDELPRL: | |
1379 | case SIOCCHGPRL: | |
fd5d687b | 1380 | return ipip6_tunnel_prl_ctl(dev, ifr, cmd); |
fa857afc | 1381 | #ifdef CONFIG_IPV6_SIT_6RD |
fd5d687b CH |
1382 | case SIOCGET6RD: |
1383 | return ipip6_tunnel_get6rd(dev, ifr); | |
fa857afc YH |
1384 | case SIOCADD6RD: |
1385 | case SIOCCHG6RD: | |
1386 | case SIOCDEL6RD: | |
fd5d687b | 1387 | return ipip6_tunnel_6rdctl(dev, ifr, cmd); |
fa857afc | 1388 | #endif |
1da177e4 | 1389 | default: |
fd5d687b | 1390 | return -EINVAL; |
1da177e4 | 1391 | } |
1da177e4 LT |
1392 | } |
1393 | ||
1326c3d5 | 1394 | static const struct net_device_ops ipip6_netdev_ops = { |
ebe084aa | 1395 | .ndo_init = ipip6_tunnel_init, |
1326c3d5 | 1396 | .ndo_uninit = ipip6_tunnel_uninit, |
32b8a8e5 | 1397 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 | 1398 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
f61dd388 | 1399 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1e99584b | 1400 | .ndo_get_iflink = ip_tunnel_get_iflink, |
f60fe2df | 1401 | .ndo_tunnel_ctl = ipip6_tunnel_ctl, |
1326c3d5 SH |
1402 | }; |
1403 | ||
15fc1f70 ED |
1404 | static void ipip6_dev_free(struct net_device *dev) |
1405 | { | |
cf71d2bc ND |
1406 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1407 | ||
e09acddf | 1408 | dst_cache_destroy(&tunnel->dst_cache); |
15fc1f70 | 1409 | free_percpu(dev->tstats); |
15fc1f70 ED |
1410 | } |
1411 | ||
61c1db7f ED |
1412 | #define SIT_FEATURES (NETIF_F_SG | \ |
1413 | NETIF_F_FRAGLIST | \ | |
1414 | NETIF_F_HIGHDMA | \ | |
1415 | NETIF_F_GSO_SOFTWARE | \ | |
1416 | NETIF_F_HW_CSUM) | |
1417 | ||
1da177e4 LT |
1418 | static void ipip6_tunnel_setup(struct net_device *dev) |
1419 | { | |
14909664 TH |
1420 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1421 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1422 | ||
1326c3d5 | 1423 | dev->netdev_ops = &ipip6_netdev_ops; |
cf124db5 DM |
1424 | dev->needs_free_netdev = true; |
1425 | dev->priv_destructor = ipip6_dev_free; | |
1da177e4 LT |
1426 | |
1427 | dev->type = ARPHRD_SIT; | |
14909664 TH |
1428 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
1429 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
b96f9afe | 1430 | dev->min_mtu = IPV6_MIN_MTU; |
f7ff1fde | 1431 | dev->max_mtu = IP6_MAX_MTU - t_hlen; |
1da177e4 | 1432 | dev->flags = IFF_NOARP; |
02875878 | 1433 | netif_keep_dst(dev); |
1da177e4 | 1434 | dev->addr_len = 4; |
8df40d10 | 1435 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1436 | dev->features |= SIT_FEATURES; |
1437 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1438 | } |
1439 | ||
15fc1f70 | 1440 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1441 | { |
1326c3d5 | 1442 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e09acddf | 1443 | int err; |
1da177e4 LT |
1444 | |
1445 | tunnel->dev = dev; | |
5e6700b3 | 1446 | tunnel->net = dev_net(dev); |
ebe084aa | 1447 | strcpy(tunnel->parms.name, dev->name); |
1da177e4 | 1448 | |
8a4a50f9 | 1449 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1450 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1451 | if (!dev->tstats) |
1452 | return -ENOMEM; | |
1453 | ||
e09acddf PA |
1454 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1455 | if (err) { | |
cf71d2bc | 1456 | free_percpu(dev->tstats); |
d7426c69 | 1457 | dev->tstats = NULL; |
e09acddf | 1458 | return err; |
cf71d2bc ND |
1459 | } |
1460 | ||
15fc1f70 | 1461 | return 0; |
1da177e4 LT |
1462 | } |
1463 | ||
4ece9009 | 1464 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1465 | { |
2941a486 | 1466 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1467 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1468 | struct net *net = dev_net(dev); |
1469 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 | 1470 | |
1da177e4 LT |
1471 | iph->version = 4; |
1472 | iph->protocol = IPPROTO_IPV6; | |
1473 | iph->ihl = 5; | |
1474 | iph->ttl = 64; | |
1475 | ||
1476 | dev_hold(dev); | |
cf778b00 | 1477 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
1da177e4 LT |
1478 | } |
1479 | ||
a8b8a889 MS |
1480 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
1481 | struct netlink_ext_ack *extack) | |
32b8a8e5 ND |
1482 | { |
1483 | u8 proto; | |
1484 | ||
c2ff682a | 1485 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1486 | return 0; |
1487 | ||
1488 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
49dbe7ae | 1489 | if (!ipip6_valid_ip_proto(proto)) |
32b8a8e5 ND |
1490 | return -EINVAL; |
1491 | ||
1492 | return 0; | |
1493 | } | |
1494 | ||
f3723416 | 1495 | static void ipip6_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
1496 | struct ip_tunnel_parm *parms, |
1497 | __u32 *fwmark) | |
f3723416 ND |
1498 | { |
1499 | memset(parms, 0, sizeof(*parms)); | |
1500 | ||
1501 | parms->iph.version = 4; | |
1502 | parms->iph.protocol = IPPROTO_IPV6; | |
1503 | parms->iph.ihl = 5; | |
1504 | parms->iph.ttl = 64; | |
1505 | ||
1506 | if (!data) | |
1507 | return; | |
1508 | ||
1509 | if (data[IFLA_IPTUN_LINK]) | |
1510 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1511 | ||
1512 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1513 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1514 | |
1515 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1516 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1517 | |
1518 | if (data[IFLA_IPTUN_TTL]) { | |
1519 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1520 | if (parms->iph.ttl) | |
1521 | parms->iph.frag_off = htons(IP_DF); | |
1522 | } | |
1523 | ||
1524 | if (data[IFLA_IPTUN_TOS]) | |
1525 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1526 | ||
1527 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1528 | parms->iph.frag_off = htons(IP_DF); | |
1529 | ||
1530 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1531 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1532 | |
1533 | if (data[IFLA_IPTUN_PROTO]) | |
1534 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1535 | ||
9830ad4c CG |
1536 | if (data[IFLA_IPTUN_FWMARK]) |
1537 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
f3723416 ND |
1538 | } |
1539 | ||
14909664 TH |
1540 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1541 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1542 | struct ip_tunnel_encap *ipencap) | |
1543 | { | |
1544 | bool ret = false; | |
1545 | ||
1546 | memset(ipencap, 0, sizeof(*ipencap)); | |
1547 | ||
1548 | if (!data) | |
1549 | return ret; | |
1550 | ||
1551 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1552 | ret = true; | |
1553 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1554 | } | |
1555 | ||
1556 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1557 | ret = true; | |
1558 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1559 | } | |
1560 | ||
1561 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1562 | ret = true; | |
a409caec | 1563 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
14909664 TH |
1564 | } |
1565 | ||
1566 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1567 | ret = true; | |
a409caec | 1568 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
14909664 TH |
1569 | } |
1570 | ||
1571 | return ret; | |
1572 | } | |
1573 | ||
e2f1f072 ND |
1574 | #ifdef CONFIG_IPV6_SIT_6RD |
1575 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1576 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1577 | struct ip_tunnel_6rd *ip6rd) | |
1578 | { | |
1579 | bool ret = false; | |
1580 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1581 | ||
1582 | if (!data) | |
1583 | return ret; | |
1584 | ||
1585 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1586 | ret = true; | |
67b61f6c | 1587 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
e2f1f072 ND |
1588 | } |
1589 | ||
1590 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1591 | ret = true; | |
1592 | ip6rd->relay_prefix = | |
1593 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1594 | } | |
1595 | ||
1596 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1597 | ret = true; | |
1598 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1599 | } | |
1600 | ||
1601 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1602 | ret = true; | |
1603 | ip6rd->relay_prefixlen = | |
1604 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1605 | } | |
1606 | ||
1607 | return ret; | |
1608 | } | |
1609 | #endif | |
1610 | ||
f3723416 | 1611 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1612 | struct nlattr *tb[], struct nlattr *data[], |
1613 | struct netlink_ext_ack *extack) | |
f3723416 ND |
1614 | { |
1615 | struct net *net = dev_net(dev); | |
1616 | struct ip_tunnel *nt; | |
14909664 | 1617 | struct ip_tunnel_encap ipencap; |
e2f1f072 ND |
1618 | #ifdef CONFIG_IPV6_SIT_6RD |
1619 | struct ip_tunnel_6rd ip6rd; | |
1620 | #endif | |
1621 | int err; | |
f3723416 ND |
1622 | |
1623 | nt = netdev_priv(dev); | |
14909664 TH |
1624 | |
1625 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1626 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1627 | if (err < 0) | |
1628 | return err; | |
1629 | } | |
1630 | ||
9830ad4c | 1631 | ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
f3723416 ND |
1632 | |
1633 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1634 | return -EEXIST; | |
1635 | ||
e2f1f072 ND |
1636 | err = ipip6_tunnel_create(dev); |
1637 | if (err < 0) | |
1638 | return err; | |
1639 | ||
2b3957c3 XL |
1640 | if (tb[IFLA_MTU]) { |
1641 | u32 mtu = nla_get_u32(tb[IFLA_MTU]); | |
1642 | ||
f7ff1fde ND |
1643 | if (mtu >= IPV6_MIN_MTU && |
1644 | mtu <= IP6_MAX_MTU - dev->hard_header_len) | |
2b3957c3 XL |
1645 | dev->mtu = mtu; |
1646 | } | |
1647 | ||
e2f1f072 ND |
1648 | #ifdef CONFIG_IPV6_SIT_6RD |
1649 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1650 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1651 | #endif | |
1652 | ||
1653 | return err; | |
f3723416 ND |
1654 | } |
1655 | ||
1656 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
1657 | struct nlattr *data[], |
1658 | struct netlink_ext_ack *extack) | |
f3723416 | 1659 | { |
86bd68bf | 1660 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1661 | struct ip_tunnel_parm p; |
14909664 | 1662 | struct ip_tunnel_encap ipencap; |
86bd68bf | 1663 | struct net *net = t->net; |
f3723416 | 1664 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1665 | #ifdef CONFIG_IPV6_SIT_6RD |
1666 | struct ip_tunnel_6rd ip6rd; | |
1667 | #endif | |
9830ad4c | 1668 | __u32 fwmark = t->fwmark; |
14909664 | 1669 | int err; |
f3723416 ND |
1670 | |
1671 | if (dev == sitn->fb_tunnel_dev) | |
1672 | return -EINVAL; | |
1673 | ||
14909664 TH |
1674 | if (ipip6_netlink_encap_parms(data, &ipencap)) { |
1675 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1676 | if (err < 0) | |
1677 | return err; | |
1678 | } | |
1679 | ||
9830ad4c | 1680 | ipip6_netlink_parms(data, &p, &fwmark); |
f3723416 ND |
1681 | |
1682 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1683 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1684 | return -EINVAL; | |
1685 | ||
1686 | t = ipip6_tunnel_locate(net, &p, 0); | |
1687 | ||
1688 | if (t) { | |
1689 | if (t->dev != dev) | |
1690 | return -EEXIST; | |
1691 | } else | |
1692 | t = netdev_priv(dev); | |
1693 | ||
9830ad4c | 1694 | ipip6_tunnel_update(t, &p, fwmark); |
e2f1f072 ND |
1695 | |
1696 | #ifdef CONFIG_IPV6_SIT_6RD | |
1697 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1698 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1699 | #endif | |
1700 | ||
f3723416 ND |
1701 | return 0; |
1702 | } | |
1703 | ||
e4c94a9c | 1704 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1705 | { |
1706 | return | |
1707 | /* IFLA_IPTUN_LINK */ | |
1708 | nla_total_size(4) + | |
1709 | /* IFLA_IPTUN_LOCAL */ | |
1710 | nla_total_size(4) + | |
1711 | /* IFLA_IPTUN_REMOTE */ | |
1712 | nla_total_size(4) + | |
1713 | /* IFLA_IPTUN_TTL */ | |
1714 | nla_total_size(1) + | |
1715 | /* IFLA_IPTUN_TOS */ | |
1716 | nla_total_size(1) + | |
a12c9a85 ND |
1717 | /* IFLA_IPTUN_PMTUDISC */ |
1718 | nla_total_size(1) + | |
1719 | /* IFLA_IPTUN_FLAGS */ | |
1720 | nla_total_size(2) + | |
32b8a8e5 ND |
1721 | /* IFLA_IPTUN_PROTO */ |
1722 | nla_total_size(1) + | |
e2f1f072 ND |
1723 | #ifdef CONFIG_IPV6_SIT_6RD |
1724 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1725 | nla_total_size(sizeof(struct in6_addr)) + | |
1726 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1727 | nla_total_size(4) + | |
1728 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1729 | nla_total_size(2) + | |
1730 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1731 | nla_total_size(2) + | |
1732 | #endif | |
14909664 TH |
1733 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1734 | nla_total_size(2) + | |
1735 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1736 | nla_total_size(2) + | |
1737 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1738 | nla_total_size(2) + | |
1739 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1740 | nla_total_size(2) + | |
9830ad4c CG |
1741 | /* IFLA_IPTUN_FWMARK */ |
1742 | nla_total_size(4) + | |
ba3e3f50 ND |
1743 | 0; |
1744 | } | |
1745 | ||
e4c94a9c | 1746 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1747 | { |
1748 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1749 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1750 | ||
1751 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1752 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
1753 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
ba3e3f50 | 1754 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
a12c9a85 ND |
1755 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1756 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1757 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1758 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
9830ad4c CG |
1759 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
1760 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
ba3e3f50 | 1761 | goto nla_put_failure; |
e2f1f072 ND |
1762 | |
1763 | #ifdef CONFIG_IPV6_SIT_6RD | |
930345ea JB |
1764 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
1765 | &tunnel->ip6rd.prefix) || | |
1766 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1767 | tunnel->ip6rd.relay_prefix) || | |
e2f1f072 ND |
1768 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
1769 | tunnel->ip6rd.prefixlen) || | |
1770 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1771 | tunnel->ip6rd.relay_prefixlen)) | |
1772 | goto nla_put_failure; | |
1773 | #endif | |
1774 | ||
14909664 TH |
1775 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
1776 | tunnel->encap.type) || | |
a409caec | 1777 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
14909664 | 1778 | tunnel->encap.sport) || |
a409caec | 1779 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
14909664 TH |
1780 | tunnel->encap.dport) || |
1781 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
e1b2cb65 | 1782 | tunnel->encap.flags)) |
14909664 TH |
1783 | goto nla_put_failure; |
1784 | ||
ba3e3f50 ND |
1785 | return 0; |
1786 | ||
1787 | nla_put_failure: | |
1788 | return -EMSGSIZE; | |
1789 | } | |
1790 | ||
f3723416 ND |
1791 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1792 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1793 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1794 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1795 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1796 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1797 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1798 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1799 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1800 | #ifdef CONFIG_IPV6_SIT_6RD |
1801 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1802 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1803 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1804 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1805 | #endif | |
14909664 TH |
1806 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1807 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1808 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1809 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
9830ad4c | 1810 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
f3723416 ND |
1811 | }; |
1812 | ||
9434266f WB |
1813 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1814 | { | |
1815 | struct net *net = dev_net(dev); | |
1816 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1817 | ||
1818 | if (dev != sitn->fb_tunnel_dev) | |
1819 | unregister_netdevice_queue(dev, head); | |
1820 | } | |
1821 | ||
ba3e3f50 ND |
1822 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1823 | .kind = "sit", | |
1824 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1825 | .policy = ipip6_policy, |
ba3e3f50 | 1826 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1827 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1828 | .validate = ipip6_validate, |
f3723416 ND |
1829 | .newlink = ipip6_newlink, |
1830 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1831 | .get_size = ipip6_get_size, |
1832 | .fill_info = ipip6_fill_info, | |
9434266f | 1833 | .dellink = ipip6_dellink, |
1728d4fa | 1834 | .get_link_net = ip_tunnel_get_link_net, |
ba3e3f50 ND |
1835 | }; |
1836 | ||
6dcd814b | 1837 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1838 | .handler = ipip6_rcv, |
1839 | .err_handler = ipip6_err, | |
c73cb5a2 | 1840 | .priority = 1, |
1da177e4 LT |
1841 | }; |
1842 | ||
32b8a8e5 ND |
1843 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1844 | .handler = ipip_rcv, | |
1845 | .err_handler = ipip6_err, | |
1846 | .priority = 2, | |
1847 | }; | |
1848 | ||
49dbe7ae SH |
1849 | #if IS_ENABLED(CONFIG_MPLS) |
1850 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
1851 | .handler = mplsip_rcv, | |
1852 | .err_handler = ipip6_err, | |
1853 | .priority = 2, | |
1854 | }; | |
1855 | #endif | |
1856 | ||
9434266f WB |
1857 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1858 | struct list_head *head) | |
db44575f | 1859 | { |
9434266f | 1860 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1861 | struct net_device *dev, *aux; |
db44575f AK |
1862 | int prio; |
1863 | ||
5e6700b3 ND |
1864 | for_each_netdev_safe(net, dev, aux) |
1865 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1866 | unregister_netdevice_queue(dev, head); | |
1867 | ||
db44575f AK |
1868 | for (prio = 1; prio < 4; prio++) { |
1869 | int h; | |
e87a8f24 | 1870 | for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { |
753ea8e9 | 1871 | struct ip_tunnel *t; |
62808f91 | 1872 | |
753ea8e9 | 1873 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
53b24b8f | 1874 | while (t) { |
5e6700b3 ND |
1875 | /* If dev is in the same netns, it has already |
1876 | * been added to the list by the previous loop. | |
1877 | */ | |
fc8f999d | 1878 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1879 | unregister_netdevice_queue(t->dev, |
1880 | head); | |
753ea8e9 | 1881 | t = rtnl_dereference(t->next); |
62808f91 | 1882 | } |
db44575f AK |
1883 | } |
1884 | } | |
1885 | } | |
1886 | ||
2c8c1e72 | 1887 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1888 | { |
67101172 | 1889 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1890 | struct ip_tunnel *t; |
8190d900 | 1891 | int err; |
8190d900 | 1892 | |
29182176 PE |
1893 | sitn->tunnels[0] = sitn->tunnels_wc; |
1894 | sitn->tunnels[1] = sitn->tunnels_l; | |
1895 | sitn->tunnels[2] = sitn->tunnels_r; | |
1896 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1897 | ||
79134e6c ED |
1898 | if (!net_has_fallback_tunnels(net)) |
1899 | return 0; | |
1900 | ||
cd3dbc19 | 1901 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1902 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1903 | ipip6_tunnel_setup); |
1904 | if (!sitn->fb_tunnel_dev) { | |
1905 | err = -ENOMEM; | |
1906 | goto err_alloc_dev; | |
1907 | } | |
be77e593 | 1908 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1909 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1910 | /* FB netdevice is special: we have one, and only one per netns. |
1911 | * Allowing to move it to another netns is clearly unsafe. | |
1912 | */ | |
1913 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1914 | |
e5d08d71 IM |
1915 | err = register_netdev(sitn->fb_tunnel_dev); |
1916 | if (err) | |
cd3dbc19 PE |
1917 | goto err_reg_dev; |
1918 | ||
4ece9009 ED |
1919 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
1920 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1921 | ||
72b36015 TF |
1922 | t = netdev_priv(sitn->fb_tunnel_dev); |
1923 | ||
1924 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1925 | return 0; |
1926 | ||
cd3dbc19 | 1927 | err_reg_dev: |
dd4080ee | 1928 | ipip6_dev_free(sitn->fb_tunnel_dev); |
07f12b26 | 1929 | free_netdev(sitn->fb_tunnel_dev); |
cd3dbc19 | 1930 | err_alloc_dev: |
8190d900 PE |
1931 | return err; |
1932 | } | |
1933 | ||
bb401cae | 1934 | static void __net_exit sit_exit_batch_net(struct list_head *net_list) |
8190d900 | 1935 | { |
62808f91 | 1936 | LIST_HEAD(list); |
bb401cae | 1937 | struct net *net; |
8190d900 | 1938 | |
cd3dbc19 | 1939 | rtnl_lock(); |
bb401cae ED |
1940 | list_for_each_entry(net, net_list, exit_list) |
1941 | sit_destroy_tunnels(net, &list); | |
1942 | ||
62808f91 | 1943 | unregister_netdevice_many(&list); |
cd3dbc19 | 1944 | rtnl_unlock(); |
8190d900 PE |
1945 | } |
1946 | ||
1947 | static struct pernet_operations sit_net_ops = { | |
1948 | .init = sit_init_net, | |
bb401cae | 1949 | .exit_batch = sit_exit_batch_net, |
67101172 EB |
1950 | .id = &sit_net_id, |
1951 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1952 | }; |
1953 | ||
89c89458 | 1954 | static void __exit sit_cleanup(void) |
1da177e4 | 1955 | { |
ba3e3f50 | 1956 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1957 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1958 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
49dbe7ae SH |
1959 | #if IS_ENABLED(CONFIG_MPLS) |
1960 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1961 | #endif | |
db44575f | 1962 | |
67101172 | 1963 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1964 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1965 | } |
1966 | ||
89c89458 | 1967 | static int __init sit_init(void) |
1da177e4 LT |
1968 | { |
1969 | int err; | |
1970 | ||
49dbe7ae | 1971 | pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 1972 | |
67101172 | 1973 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1974 | if (err < 0) |
d5aa407f AD |
1975 | return err; |
1976 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1977 | if (err < 0) { | |
32b8a8e5 | 1978 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1979 | goto xfrm_tunnel_failed; |
d5aa407f | 1980 | } |
32b8a8e5 ND |
1981 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1982 | if (err < 0) { | |
1983 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1984 | goto xfrm_tunnel4_failed; | |
1985 | } | |
49dbe7ae SH |
1986 | #if IS_ENABLED(CONFIG_MPLS) |
1987 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
1988 | if (err < 0) { | |
1989 | pr_info("%s: can't register mplsip\n", __func__); | |
1990 | goto xfrm_tunnel_mpls_failed; | |
1991 | } | |
1992 | #endif | |
ba3e3f50 ND |
1993 | err = rtnl_link_register(&sit_link_ops); |
1994 | if (err < 0) | |
1995 | goto rtnl_link_failed; | |
1996 | ||
1997 | out: | |
1da177e4 | 1998 | return err; |
ba3e3f50 ND |
1999 | |
2000 | rtnl_link_failed: | |
49dbe7ae SH |
2001 | #if IS_ENABLED(CONFIG_MPLS) |
2002 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
2003 | xfrm_tunnel_mpls_failed: | |
2004 | #endif | |
32b8a8e5 ND |
2005 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
2006 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
2007 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
2008 | xfrm_tunnel_failed: | |
2009 | unregister_pernet_device(&sit_net_ops); | |
2010 | goto out; | |
1da177e4 | 2011 | } |
989e5b96 JR |
2012 | |
2013 | module_init(sit_init); | |
2014 | module_exit(sit_cleanup); | |
39c85086 | 2015 | MODULE_LICENSE("GPL"); |
f98f89a0 | 2016 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 2017 | MODULE_ALIAS_NETDEV("sit0"); |