Commit | Line | Data |
---|---|---|
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 | ipip6_tunnel_link(sitn, t); |
222 | return 0; | |
223 | ||
224 | out: | |
225 | return err; | |
226 | } | |
227 | ||
3a43be3c | 228 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, |
ca8def14 | 229 | struct ip_tunnel_parm *parms, int create) |
1da177e4 | 230 | { |
e69a4adc AV |
231 | __be32 remote = parms->iph.daddr; |
232 | __be32 local = parms->iph.saddr; | |
3a43be3c ED |
233 | struct ip_tunnel *t, *nt; |
234 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 235 | struct net_device *dev; |
1da177e4 | 236 | char name[IFNAMSIZ]; |
ca8def14 | 237 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 238 | |
3a43be3c ED |
239 | for (tp = __ipip6_bucket(sitn, parms); |
240 | (t = rtnl_dereference(*tp)) != NULL; | |
241 | tp = &t->next) { | |
8db99e57 | 242 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
243 | remote == t->parms.iph.daddr && |
244 | parms->link == t->parms.link) { | |
8db99e57 SH |
245 | if (create) |
246 | return NULL; | |
247 | else | |
248 | return t; | |
249 | } | |
1da177e4 LT |
250 | } |
251 | if (!create) | |
252 | goto failed; | |
253 | ||
b95211e0 ED |
254 | if (parms->name[0]) { |
255 | if (!dev_valid_name(parms->name)) | |
256 | goto failed; | |
1da177e4 | 257 | strlcpy(name, parms->name, IFNAMSIZ); |
b95211e0 | 258 | } else { |
15fc1f70 | 259 | strcpy(name, "sit%d"); |
b95211e0 | 260 | } |
c835a677 TG |
261 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
262 | ipip6_tunnel_setup); | |
63159f29 | 263 | if (!dev) |
1da177e4 LT |
264 | return NULL; |
265 | ||
7a97146c PE |
266 | dev_net_set(dev, net); |
267 | ||
2941a486 | 268 | nt = netdev_priv(dev); |
1326c3d5 | 269 | |
1da177e4 | 270 | nt->parms = *parms; |
f3723416 | 271 | if (ipip6_tunnel_create(dev) < 0) |
b37d428b | 272 | goto failed_free; |
1da177e4 | 273 | |
1da177e4 LT |
274 | return nt; |
275 | ||
b37d428b | 276 | failed_free: |
cf124db5 | 277 | free_netdev(dev); |
1da177e4 LT |
278 | failed: |
279 | return NULL; | |
280 | } | |
281 | ||
ef9a9d11 ED |
282 | #define for_each_prl_rcu(start) \ |
283 | for (prl = rcu_dereference(start); \ | |
284 | prl; \ | |
285 | prl = rcu_dereference(prl->next)) | |
286 | ||
fadf6bf0 | 287 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 288 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 | 289 | { |
ef9a9d11 | 290 | struct ip_tunnel_prl_entry *prl; |
fadf6bf0 | 291 | |
ef9a9d11 ED |
292 | for_each_prl_rcu(t->prl) |
293 | if (prl->addr == addr) | |
fadf6bf0 | 294 | break; |
ef9a9d11 | 295 | return prl; |
fadf6bf0 TF |
296 | |
297 | } | |
298 | ||
fd5d687b | 299 | static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr) |
300aaeea | 300 | { |
fd5d687b CH |
301 | struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data; |
302 | struct ip_tunnel *t = netdev_priv(dev); | |
2b4743bd | 303 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
304 | struct ip_tunnel_prl_entry *prl; |
305 | unsigned int cmax, c = 0, ca, len; | |
306 | int ret = 0; | |
307 | ||
fd5d687b CH |
308 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) |
309 | return -EINVAL; | |
310 | ||
2b4743bd YH |
311 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
312 | return -EFAULT; | |
313 | cmax = kprl.datalen / sizeof(kprl); | |
314 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
315 | cmax = 1; |
316 | ||
317 | /* For simple GET or for root users, | |
318 | * we try harder to allocate. | |
319 | */ | |
320 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
0ccc22f4 | 321 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
300aaeea YH |
322 | NULL; |
323 | ||
ef9a9d11 | 324 | rcu_read_lock(); |
300aaeea | 325 | |
284fda1e | 326 | ca = min(t->prl_count, cmax); |
300aaeea YH |
327 | |
328 | if (!kp) { | |
329 | /* We don't try hard to allocate much memory for | |
330 | * non-root users. | |
331 | * For root users, retry allocating enough memory for | |
332 | * the answer. | |
333 | */ | |
334 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
335 | if (!kp) { | |
336 | ret = -ENOMEM; | |
337 | goto out; | |
338 | } | |
339 | } | |
340 | ||
341 | c = 0; | |
ef9a9d11 | 342 | for_each_prl_rcu(t->prl) { |
298bf12d | 343 | if (c >= cmax) |
300aaeea | 344 | break; |
2b4743bd | 345 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
346 | continue; |
347 | kp[c].addr = prl->addr; | |
348 | kp[c].flags = prl->flags; | |
349 | c++; | |
2b4743bd | 350 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
351 | break; |
352 | } | |
353 | out: | |
ef9a9d11 | 354 | rcu_read_unlock(); |
300aaeea YH |
355 | |
356 | len = sizeof(*kp) * c; | |
2b4743bd YH |
357 | ret = 0; |
358 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
359 | ret = -EFAULT; | |
300aaeea YH |
360 | |
361 | kfree(kp); | |
300aaeea | 362 | |
2b4743bd | 363 | return ret; |
300aaeea YH |
364 | } |
365 | ||
fadf6bf0 TF |
366 | static int |
367 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
368 | { | |
369 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
370 | int err = 0; |
371 | ||
0009ae1f YH |
372 | if (a->addr == htonl(INADDR_ANY)) |
373 | return -EINVAL; | |
374 | ||
aac4dddc | 375 | ASSERT_RTNL(); |
fadf6bf0 | 376 | |
3a43be3c | 377 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
300aaeea | 378 | if (p->addr == a->addr) { |
ef9a9d11 ED |
379 | if (chg) { |
380 | p->flags = a->flags; | |
381 | goto out; | |
382 | } | |
3fcfa129 YH |
383 | err = -EEXIST; |
384 | goto out; | |
fadf6bf0 TF |
385 | } |
386 | } | |
387 | ||
3fcfa129 YH |
388 | if (chg) { |
389 | err = -ENXIO; | |
390 | goto out; | |
391 | } | |
fadf6bf0 TF |
392 | |
393 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
394 | if (!p) { |
395 | err = -ENOBUFS; | |
396 | goto out; | |
397 | } | |
fadf6bf0 | 398 | |
fadf6bf0 | 399 | p->next = t->prl; |
300aaeea YH |
400 | p->addr = a->addr; |
401 | p->flags = a->flags; | |
ef9a9d11 | 402 | t->prl_count++; |
cf778b00 | 403 | rcu_assign_pointer(t->prl, p); |
3fcfa129 | 404 | out: |
3fcfa129 | 405 | return err; |
fadf6bf0 TF |
406 | } |
407 | ||
ef9a9d11 ED |
408 | static void prl_list_destroy_rcu(struct rcu_head *head) |
409 | { | |
410 | struct ip_tunnel_prl_entry *p, *n; | |
411 | ||
412 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
413 | do { | |
753ea8e9 | 414 | n = rcu_dereference_protected(p->next, 1); |
ef9a9d11 ED |
415 | kfree(p); |
416 | p = n; | |
417 | } while (p); | |
418 | } | |
419 | ||
fadf6bf0 TF |
420 | static int |
421 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
422 | { | |
753ea8e9 ED |
423 | struct ip_tunnel_prl_entry *x; |
424 | struct ip_tunnel_prl_entry __rcu **p; | |
3fcfa129 YH |
425 | int err = 0; |
426 | ||
aac4dddc | 427 | ASSERT_RTNL(); |
fadf6bf0 | 428 | |
0009ae1f | 429 | if (a && a->addr != htonl(INADDR_ANY)) { |
753ea8e9 ED |
430 | for (p = &t->prl; |
431 | (x = rtnl_dereference(*p)) != NULL; | |
432 | p = &x->next) { | |
433 | if (x->addr == a->addr) { | |
fadf6bf0 | 434 | *p = x->next; |
11c476f3 | 435 | kfree_rcu(x, rcu_head); |
300aaeea | 436 | t->prl_count--; |
3fcfa129 | 437 | goto out; |
fadf6bf0 TF |
438 | } |
439 | } | |
3fcfa129 | 440 | err = -ENXIO; |
fadf6bf0 | 441 | } else { |
753ea8e9 ED |
442 | x = rtnl_dereference(t->prl); |
443 | if (x) { | |
ef9a9d11 | 444 | t->prl_count = 0; |
ef9a9d11 ED |
445 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
446 | t->prl = NULL; | |
fadf6bf0 TF |
447 | } |
448 | } | |
3fcfa129 | 449 | out: |
4b279601 | 450 | return err; |
fadf6bf0 TF |
451 | } |
452 | ||
fd5d687b CH |
453 | static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, |
454 | int cmd) | |
455 | { | |
456 | struct ip_tunnel *t = netdev_priv(dev); | |
457 | struct ip_tunnel_prl prl; | |
458 | int err; | |
459 | ||
460 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) | |
461 | return -EPERM; | |
462 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) | |
463 | return -EINVAL; | |
464 | ||
465 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
466 | return -EFAULT; | |
467 | ||
468 | switch (cmd) { | |
469 | case SIOCDELPRL: | |
470 | err = ipip6_tunnel_del_prl(t, &prl); | |
471 | break; | |
472 | case SIOCADDPRL: | |
473 | case SIOCCHGPRL: | |
474 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
475 | break; | |
476 | } | |
477 | dst_cache_reset(&t->dst_cache); | |
478 | netdev_state_change(dev); | |
479 | return err; | |
480 | } | |
481 | ||
fadf6bf0 | 482 | static int |
b71d1d42 | 483 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
fadf6bf0 | 484 | { |
3fcfa129 | 485 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
486 | int ok = 1; |
487 | ||
ef9a9d11 | 488 | rcu_read_lock(); |
3fcfa129 | 489 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
fadf6bf0 | 490 | if (p) { |
300aaeea | 491 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
492 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
493 | else | |
494 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
495 | } else { | |
b71d1d42 ED |
496 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
497 | ||
fadf6bf0 TF |
498 | if (ipv6_addr_is_isatap(addr6) && |
499 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 500 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
501 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
502 | else | |
503 | ok = 0; | |
504 | } | |
ef9a9d11 | 505 | rcu_read_unlock(); |
fadf6bf0 TF |
506 | return ok; |
507 | } | |
508 | ||
1da177e4 LT |
509 | static void ipip6_tunnel_uninit(struct net_device *dev) |
510 | { | |
5e6700b3 ND |
511 | struct ip_tunnel *tunnel = netdev_priv(dev); |
512 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
ca8def14 | 513 | |
cd3dbc19 | 514 | if (dev == sitn->fb_tunnel_dev) { |
a9b3cd7f | 515 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
1da177e4 | 516 | } else { |
5e6700b3 ND |
517 | ipip6_tunnel_unlink(sitn, tunnel); |
518 | ipip6_tunnel_del_prl(tunnel, NULL); | |
1da177e4 | 519 | } |
e09acddf | 520 | dst_cache_reset(&tunnel->dst_cache); |
3a43be3c | 521 | dev_put(dev); |
1da177e4 LT |
522 | } |
523 | ||
c73cb5a2 | 524 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 525 | { |
b71d1d42 | 526 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
527 | const int type = icmp_hdr(skb)->type; |
528 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 529 | unsigned int data_len = 0; |
1da177e4 | 530 | struct ip_tunnel *t; |
3051fbec | 531 | int sifindex; |
c73cb5a2 | 532 | int err; |
1da177e4 LT |
533 | |
534 | switch (type) { | |
535 | default: | |
536 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 537 | return 0; |
1da177e4 LT |
538 | |
539 | case ICMP_DEST_UNREACH: | |
540 | switch (code) { | |
541 | case ICMP_SR_FAILED: | |
1da177e4 | 542 | /* Impossible event. */ |
c73cb5a2 | 543 | return 0; |
1da177e4 LT |
544 | default: |
545 | /* All others are translated to HOST_UNREACH. | |
546 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
547 | I believe they are just ether pollution. --ANK | |
548 | */ | |
549 | break; | |
550 | } | |
551 | break; | |
552 | case ICMP_TIME_EXCEEDED: | |
553 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 554 | return 0; |
20e1954f | 555 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 556 | break; |
ec18d9a2 DM |
557 | case ICMP_REDIRECT: |
558 | break; | |
1da177e4 LT |
559 | } |
560 | ||
c73cb5a2 KM |
561 | err = -ENOENT; |
562 | ||
3051fbec DA |
563 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
564 | t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
565 | iph->daddr, iph->saddr, sifindex); | |
63159f29 | 566 | if (!t) |
36393395 DM |
567 | goto out; |
568 | ||
569 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
570 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d888f396 | 571 | t->parms.link, iph->protocol); |
36393395 DM |
572 | err = 0; |
573 | goto out; | |
574 | } | |
ec18d9a2 | 575 | if (type == ICMP_REDIRECT) { |
1042caa7 MŻ |
576 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, |
577 | iph->protocol); | |
ec18d9a2 DM |
578 | err = 0; |
579 | goto out; | |
580 | } | |
36393395 | 581 | |
2d7a3b27 | 582 | err = 0; |
173656ac HL |
583 | if (__in6_dev_get(skb->dev) && |
584 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) | |
1da177e4 | 585 | goto out; |
c73cb5a2 | 586 | |
2d7a3b27 | 587 | if (t->parms.iph.daddr == 0) |
ca15a078 OG |
588 | goto out; |
589 | ||
1da177e4 LT |
590 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
591 | goto out; | |
592 | ||
bb80087a | 593 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
594 | t->err_count++; |
595 | else | |
596 | t->err_count = 1; | |
597 | t->err_time = jiffies; | |
598 | out: | |
c73cb5a2 | 599 | return err; |
1da177e4 LT |
600 | } |
601 | ||
218774dc HFS |
602 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
603 | const struct in6_addr *v6addr) | |
604 | { | |
605 | __be32 v4embed = 0; | |
606 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
607 | return true; | |
608 | return false; | |
609 | } | |
610 | ||
7df37ff3 CB |
611 | /* Checks if an address matches an address on the tunnel interface. |
612 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
613 | * Long story: | |
614 | * This function is called after we considered the packet as spoofed | |
615 | * in is_spoofed_6rd. | |
616 | * We may have a router that is doing NAT for proto 41 packets | |
617 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
618 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
619 | * function will return true, dropping the packet. | |
620 | * But, we can still check if is spoofed against the IP | |
621 | * addresses associated with the interface. | |
622 | */ | |
623 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
624 | const struct in6_addr *v6dst) | |
625 | { | |
626 | int prefix_len; | |
627 | ||
628 | #ifdef CONFIG_IPV6_SIT_6RD | |
629 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
630 | - tunnel->ip6rd.relay_prefixlen; | |
631 | #else | |
632 | prefix_len = 48; | |
633 | #endif | |
634 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
635 | } | |
636 | ||
637 | /* Returns true if a packet is spoofed */ | |
638 | static bool packet_is_spoofed(struct sk_buff *skb, | |
639 | const struct iphdr *iph, | |
640 | struct ip_tunnel *tunnel) | |
641 | { | |
642 | const struct ipv6hdr *ipv6h; | |
643 | ||
644 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
645 | if (!isatap_chksrc(skb, iph, tunnel)) | |
646 | return true; | |
647 | ||
648 | return false; | |
649 | } | |
650 | ||
651 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
652 | return false; | |
653 | ||
654 | ipv6h = ipv6_hdr(skb); | |
655 | ||
656 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
657 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
658 | &iph->saddr, &ipv6h->saddr, | |
659 | &iph->daddr, &ipv6h->daddr); | |
660 | return true; | |
661 | } | |
662 | ||
663 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
664 | return false; | |
665 | ||
666 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
667 | return false; | |
668 | ||
669 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
670 | &iph->saddr, &ipv6h->saddr, | |
671 | &iph->daddr, &ipv6h->daddr); | |
672 | return true; | |
673 | } | |
674 | ||
1da177e4 LT |
675 | static int ipip6_rcv(struct sk_buff *skb) |
676 | { | |
1ad759d8 | 677 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 678 | struct ip_tunnel *tunnel; |
3051fbec | 679 | int sifindex; |
f4e0b4c5 | 680 | int err; |
1da177e4 | 681 | |
3051fbec | 682 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
4fddbf5d | 683 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 684 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 685 | if (tunnel) { |
8f84985f | 686 | struct pcpu_sw_netstats *tstats; |
15fc1f70 | 687 | |
32b8a8e5 ND |
688 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
689 | tunnel->parms.iph.protocol != 0) | |
690 | goto out; | |
691 | ||
b0e380b1 | 692 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 693 | skb_reset_network_header(skb); |
8cdfab8a | 694 | IPCB(skb)->flags = 0; |
a09a4c8d | 695 | skb->dev = tunnel->dev; |
c7dc89c0 | 696 | |
7df37ff3 CB |
697 | if (packet_is_spoofed(skb, iph, tunnel)) { |
698 | tunnel->dev->stats.rx_errors++; | |
699 | goto out; | |
f4e0b4c5 ND |
700 | } |
701 | ||
a09a4c8d JG |
702 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
703 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
704 | goto out; | |
f4e0b4c5 | 705 | |
bb9bd814 LB |
706 | /* skb can be uncloned in iptunnel_pull_header, so |
707 | * old iph is no longer valid | |
708 | */ | |
709 | iph = (const struct iphdr *)skb_mac_header(skb); | |
f4e0b4c5 ND |
710 | err = IP_ECN_decapsulate(iph, skb); |
711 | if (unlikely(err)) { | |
712 | if (log_ecn_error) | |
713 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
714 | &iph->saddr, iph->tos); | |
715 | if (err > 1) { | |
716 | ++tunnel->dev->stats.rx_frame_errors; | |
717 | ++tunnel->dev->stats.rx_errors; | |
718 | goto out; | |
719 | } | |
c7dc89c0 | 720 | } |
d19d56dd | 721 | |
15fc1f70 | 722 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
c3ac17cd | 723 | u64_stats_update_begin(&tstats->syncp); |
15fc1f70 ED |
724 | tstats->rx_packets++; |
725 | tstats->rx_bytes += skb->len; | |
c3ac17cd | 726 | u64_stats_update_end(&tstats->syncp); |
15fc1f70 | 727 | |
caf586e5 | 728 | netif_rx(skb); |
8990f468 | 729 | |
1da177e4 LT |
730 | return 0; |
731 | } | |
732 | ||
6dcdd1b3 | 733 | /* no tunnel matched, let upstream know, ipsec may handle it */ |
6dcdd1b3 | 734 | return 1; |
1da177e4 | 735 | out: |
36ca34cc | 736 | kfree_skb(skb); |
1da177e4 LT |
737 | return 0; |
738 | } | |
739 | ||
49dbe7ae | 740 | static const struct tnl_ptk_info ipip_tpi = { |
32b8a8e5 ND |
741 | /* no tunnel info required for ipip. */ |
742 | .proto = htons(ETH_P_IP), | |
743 | }; | |
744 | ||
49dbe7ae SH |
745 | #if IS_ENABLED(CONFIG_MPLS) |
746 | static const struct tnl_ptk_info mplsip_tpi = { | |
747 | /* no tunnel info required for mplsip. */ | |
748 | .proto = htons(ETH_P_MPLS_UC), | |
749 | }; | |
750 | #endif | |
751 | ||
752 | static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
32b8a8e5 | 753 | { |
3d7b46cd | 754 | const struct iphdr *iph; |
32b8a8e5 | 755 | struct ip_tunnel *tunnel; |
3051fbec DA |
756 | int sifindex; |
757 | ||
758 | sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; | |
32b8a8e5 | 759 | |
3d7b46cd | 760 | iph = ip_hdr(skb); |
32b8a8e5 | 761 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
3051fbec | 762 | iph->saddr, iph->daddr, sifindex); |
53b24b8f | 763 | if (tunnel) { |
49dbe7ae SH |
764 | const struct tnl_ptk_info *tpi; |
765 | ||
766 | if (tunnel->parms.iph.protocol != ipproto && | |
32b8a8e5 ND |
767 | tunnel->parms.iph.protocol != 0) |
768 | goto drop; | |
769 | ||
770 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
771 | goto drop; | |
49dbe7ae SH |
772 | #if IS_ENABLED(CONFIG_MPLS) |
773 | if (ipproto == IPPROTO_MPLS) | |
774 | tpi = &mplsip_tpi; | |
775 | else | |
776 | #endif | |
777 | tpi = &ipip_tpi; | |
778 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 779 | goto drop; |
49dbe7ae | 780 | return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
32b8a8e5 ND |
781 | } |
782 | ||
783 | return 1; | |
784 | ||
785 | drop: | |
786 | kfree_skb(skb); | |
787 | return 0; | |
788 | } | |
789 | ||
49dbe7ae SH |
790 | static int ipip_rcv(struct sk_buff *skb) |
791 | { | |
792 | return sit_tunnel_rcv(skb, IPPROTO_IPIP); | |
793 | } | |
794 | ||
795 | #if IS_ENABLED(CONFIG_MPLS) | |
796 | static int mplsip_rcv(struct sk_buff *skb) | |
797 | { | |
798 | return sit_tunnel_rcv(skb, IPPROTO_MPLS); | |
799 | } | |
800 | #endif | |
801 | ||
fa857afc | 802 | /* |
218774dc HFS |
803 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
804 | * stores the embedded IPv4 address in v4dst and returns true. | |
fa857afc | 805 | */ |
218774dc HFS |
806 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
807 | __be32 *v4dst) | |
1da177e4 | 808 | { |
fa857afc YH |
809 | #ifdef CONFIG_IPV6_SIT_6RD |
810 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
811 | tunnel->ip6rd.prefixlen)) { | |
3a43be3c | 812 | unsigned int pbw0, pbi0; |
fa857afc YH |
813 | int pbi1; |
814 | u32 d; | |
815 | ||
816 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
817 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
818 | ||
a843dc4e ML |
819 | d = tunnel->ip6rd.relay_prefixlen < 32 ? |
820 | (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
821 | tunnel->ip6rd.relay_prefixlen : 0; | |
fa857afc YH |
822 | |
823 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
824 | if (pbi1 > 0) | |
e7db38c3 | 825 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
fa857afc YH |
826 | (32 - pbi1); |
827 | ||
218774dc HFS |
828 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
829 | return true; | |
fa857afc YH |
830 | } |
831 | #else | |
1da177e4 | 832 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 833 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
218774dc HFS |
834 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
835 | return true; | |
1da177e4 | 836 | } |
fa857afc | 837 | #endif |
218774dc HFS |
838 | return false; |
839 | } | |
840 | ||
841 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
842 | const struct in6_addr *v6dst) | |
843 | { | |
844 | __be32 dst = 0; | |
845 | check_6rd(tunnel, v6dst, &dst); | |
1da177e4 LT |
846 | return dst; |
847 | } | |
848 | ||
849 | /* | |
850 | * This function assumes it is being called from dev_queue_xmit() | |
851 | * and that skb is filled properly by that function. | |
852 | */ | |
853 | ||
6fef4c0c SH |
854 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
855 | struct net_device *dev) | |
1da177e4 | 856 | { |
2941a486 | 857 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 ED |
858 | const struct iphdr *tiph = &tunnel->parms.iph; |
859 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
1da177e4 | 860 | u8 tos = tunnel->parms.iph.tos; |
292f4f3c | 861 | __be16 df = tiph->frag_off; |
67ba4152 IM |
862 | struct rtable *rt; /* Route to the other host */ |
863 | struct net_device *tdev; /* Device to other host */ | |
864 | unsigned int max_headroom; /* The extra header space needed */ | |
e69a4adc | 865 | __be32 dst = tiph->daddr; |
31e4543d | 866 | struct flowi4 fl4; |
1da177e4 | 867 | int mtu; |
b71d1d42 | 868 | const struct in6_addr *addr6; |
1da177e4 | 869 | int addr_type; |
0e6fbc5b | 870 | u8 ttl; |
14909664 TH |
871 | u8 protocol = IPPROTO_IPV6; |
872 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1da177e4 | 873 | |
c2bceb3d LEM |
874 | if (tos == 1) |
875 | tos = ipv6_get_dsfield(iph6); | |
876 | ||
c7dc89c0 FT |
877 | /* ISATAP (RFC4214) - must come before 6to4 */ |
878 | if (dev->priv_flags & IFF_ISATAP) { | |
879 | struct neighbour *neigh = NULL; | |
1e2927b0 | 880 | bool do_tx_error = false; |
c7dc89c0 | 881 | |
adf30907 | 882 | if (skb_dst(skb)) |
1e2927b0 | 883 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
c7dc89c0 | 884 | |
63159f29 | 885 | if (!neigh) { |
7df37ff3 | 886 | net_dbg_ratelimited("nexthop == NULL\n"); |
c7dc89c0 FT |
887 | goto tx_error; |
888 | } | |
889 | ||
3e866703 | 890 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
c7dc89c0 FT |
891 | addr_type = ipv6_addr_type(addr6); |
892 | ||
893 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
894 | ipv6_addr_is_isatap(addr6)) | |
895 | dst = addr6->s6_addr32[3]; | |
896 | else | |
1e2927b0 DM |
897 | do_tx_error = true; |
898 | ||
899 | neigh_release(neigh); | |
900 | if (do_tx_error) | |
c7dc89c0 FT |
901 | goto tx_error; |
902 | } | |
903 | ||
1da177e4 | 904 | if (!dst) |
218774dc | 905 | dst = try_6rd(tunnel, &iph6->daddr); |
1da177e4 LT |
906 | |
907 | if (!dst) { | |
908 | struct neighbour *neigh = NULL; | |
1e2927b0 | 909 | bool do_tx_error = false; |
1da177e4 | 910 | |
adf30907 | 911 | if (skb_dst(skb)) |
1e2927b0 | 912 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
1da177e4 | 913 | |
63159f29 | 914 | if (!neigh) { |
7df37ff3 | 915 | net_dbg_ratelimited("nexthop == NULL\n"); |
1da177e4 LT |
916 | goto tx_error; |
917 | } | |
918 | ||
3e866703 | 919 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
920 | addr_type = ipv6_addr_type(addr6); |
921 | ||
922 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 923 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
924 | addr_type = ipv6_addr_type(addr6); |
925 | } | |
926 | ||
1e2927b0 DM |
927 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
928 | dst = addr6->s6_addr32[3]; | |
929 | else | |
930 | do_tx_error = true; | |
1da177e4 | 931 | |
1e2927b0 DM |
932 | neigh_release(neigh); |
933 | if (do_tx_error) | |
934 | goto tx_error; | |
1da177e4 LT |
935 | } |
936 | ||
9830ad4c CG |
937 | flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
938 | RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, | |
939 | 0, dst, tiph->saddr, 0, 0, | |
940 | sock_net_uid(tunnel->net, NULL)); | |
9830ad4c | 941 | |
6e3d1bbb HY |
942 | rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); |
943 | if (!rt) { | |
944 | rt = ip_route_output_flow(tunnel->net, &fl4, NULL); | |
945 | if (IS_ERR(rt)) { | |
946 | dev->stats.tx_carrier_errors++; | |
947 | goto tx_error_icmp; | |
948 | } | |
949 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); | |
1da177e4 | 950 | } |
6e3d1bbb | 951 | |
1da177e4 LT |
952 | if (rt->rt_type != RTN_UNICAST) { |
953 | ip_rt_put(rt); | |
15fc1f70 | 954 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
955 | goto tx_error_icmp; |
956 | } | |
d8d1f30b | 957 | tdev = rt->dst.dev; |
1da177e4 LT |
958 | |
959 | if (tdev == dev) { | |
960 | ip_rt_put(rt); | |
15fc1f70 | 961 | dev->stats.collisions++; |
1da177e4 LT |
962 | goto tx_error; |
963 | } | |
964 | ||
7e13318d | 965 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
14909664 | 966 | ip_rt_put(rt); |
aed069df | 967 | goto tx_error; |
14909664 TH |
968 | } |
969 | ||
292f4f3c | 970 | if (df) { |
14909664 | 971 | mtu = dst_mtu(&rt->dst) - t_hlen; |
1da177e4 | 972 | |
292f4f3c | 973 | if (mtu < 68) { |
15fc1f70 | 974 | dev->stats.collisions++; |
292f4f3c HX |
975 | ip_rt_put(rt); |
976 | goto tx_error; | |
977 | } | |
1da177e4 | 978 | |
292f4f3c HX |
979 | if (mtu < IPV6_MIN_MTU) { |
980 | mtu = IPV6_MIN_MTU; | |
981 | df = 0; | |
982 | } | |
983 | ||
f15ca723 | 984 | if (tunnel->parms.iph.daddr) |
4d42df46 | 985 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
292f4f3c | 986 | |
58a47824 | 987 | if (skb->len > mtu && !skb_is_gso(skb)) { |
4372339e | 988 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
292f4f3c HX |
989 | ip_rt_put(rt); |
990 | goto tx_error; | |
991 | } | |
1da177e4 LT |
992 | } |
993 | ||
994 | if (tunnel->err_count > 0) { | |
bb80087a WY |
995 | if (time_before(jiffies, |
996 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
997 | tunnel->err_count--; |
998 | dst_link_failure(skb); | |
999 | } else | |
1000 | tunnel->err_count = 0; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Okay, now see if we can stuff it in the buffer as-is. | |
1005 | */ | |
14909664 | 1006 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; |
1da177e4 | 1007 | |
cfbba49d PM |
1008 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1009 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
1010 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
1011 | if (!new_skb) { | |
1012 | ip_rt_put(rt); | |
15fc1f70 | 1013 | dev->stats.tx_dropped++; |
66028310 | 1014 | kfree_skb(skb); |
6ed10654 | 1015 | return NETDEV_TX_OK; |
1da177e4 LT |
1016 | } |
1017 | if (skb->sk) | |
1018 | skb_set_owner_w(new_skb, skb->sk); | |
1019 | dev_kfree_skb(skb); | |
1020 | skb = new_skb; | |
0660e03f | 1021 | iph6 = ipv6_hdr(skb); |
1da177e4 | 1022 | } |
0e6fbc5b PS |
1023 | ttl = tiph->ttl; |
1024 | if (ttl == 0) | |
1025 | ttl = iph6->hop_limit; | |
1026 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
1da177e4 | 1027 | |
14909664 | 1028 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
6a9eadcc | 1029 | ip_rt_put(rt); |
14909664 | 1030 | goto tx_error; |
6a9eadcc | 1031 | } |
3d483058 | 1032 | |
469471cd TH |
1033 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
1034 | ||
039f5062 PS |
1035 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
1036 | df, !net_eq(tunnel->net, dev_net(dev))); | |
6ed10654 | 1037 | return NETDEV_TX_OK; |
1da177e4 LT |
1038 | |
1039 | tx_error_icmp: | |
1040 | dst_link_failure(skb); | |
1041 | tx_error: | |
66028310 | 1042 | kfree_skb(skb); |
61c1db7f | 1043 | dev->stats.tx_errors++; |
6ed10654 | 1044 | return NETDEV_TX_OK; |
1da177e4 LT |
1045 | } |
1046 | ||
49dbe7ae SH |
1047 | static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
1048 | struct net_device *dev, u8 ipproto) | |
32b8a8e5 ND |
1049 | { |
1050 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1051 | const struct iphdr *tiph = &tunnel->parms.iph; | |
1052 | ||
7e13318d | 1053 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 1054 | goto tx_error; |
32b8a8e5 | 1055 | |
49dbe7ae | 1056 | skb_set_inner_ipproto(skb, ipproto); |
469471cd | 1057 | |
49dbe7ae | 1058 | ip_tunnel_xmit(skb, dev, tiph, ipproto); |
32b8a8e5 | 1059 | return NETDEV_TX_OK; |
aed069df AD |
1060 | tx_error: |
1061 | kfree_skb(skb); | |
61c1db7f ED |
1062 | dev->stats.tx_errors++; |
1063 | return NETDEV_TX_OK; | |
32b8a8e5 ND |
1064 | } |
1065 | ||
1066 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1067 | struct net_device *dev) | |
1068 | { | |
cb9f1b78 WB |
1069 | if (!pskb_inet_may_pull(skb)) |
1070 | goto tx_err; | |
1071 | ||
32b8a8e5 ND |
1072 | switch (skb->protocol) { |
1073 | case htons(ETH_P_IP): | |
49dbe7ae | 1074 | sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
32b8a8e5 ND |
1075 | break; |
1076 | case htons(ETH_P_IPV6): | |
1077 | ipip6_tunnel_xmit(skb, dev); | |
1078 | break; | |
49dbe7ae SH |
1079 | #if IS_ENABLED(CONFIG_MPLS) |
1080 | case htons(ETH_P_MPLS_UC): | |
1081 | sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); | |
1082 | break; | |
1083 | #endif | |
32b8a8e5 ND |
1084 | default: |
1085 | goto tx_err; | |
1086 | } | |
1087 | ||
1088 | return NETDEV_TX_OK; | |
1089 | ||
1090 | tx_err: | |
1091 | dev->stats.tx_errors++; | |
66028310 | 1092 | kfree_skb(skb); |
32b8a8e5 ND |
1093 | return NETDEV_TX_OK; |
1094 | ||
1095 | } | |
1096 | ||
8a4a50f9 MS |
1097 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
1098 | { | |
1099 | struct net_device *tdev = NULL; | |
1100 | struct ip_tunnel *tunnel; | |
b71d1d42 | 1101 | const struct iphdr *iph; |
31e4543d | 1102 | struct flowi4 fl4; |
8a4a50f9 MS |
1103 | |
1104 | tunnel = netdev_priv(dev); | |
1105 | iph = &tunnel->parms.iph; | |
1106 | ||
1107 | if (iph->daddr) { | |
5e6700b3 ND |
1108 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
1109 | NULL, | |
78fbfd8a DM |
1110 | iph->daddr, iph->saddr, |
1111 | 0, 0, | |
1112 | IPPROTO_IPV6, | |
1113 | RT_TOS(iph->tos), | |
1114 | tunnel->parms.link); | |
b23dd4fe DM |
1115 | |
1116 | if (!IS_ERR(rt)) { | |
d8d1f30b | 1117 | tdev = rt->dst.dev; |
8a4a50f9 MS |
1118 | ip_rt_put(rt); |
1119 | } | |
1120 | dev->flags |= IFF_POINTOPOINT; | |
1121 | } | |
1122 | ||
1123 | if (!tdev && tunnel->parms.link) | |
5e6700b3 | 1124 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
8a4a50f9 | 1125 | |
ff6ab32b | 1126 | if (tdev && !netif_is_l3_master(tdev)) { |
14909664 TH |
1127 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1128 | ||
14909664 | 1129 | dev->mtu = tdev->mtu - t_hlen; |
8a4a50f9 MS |
1130 | if (dev->mtu < IPV6_MIN_MTU) |
1131 | dev->mtu = IPV6_MIN_MTU; | |
1132 | } | |
8a4a50f9 MS |
1133 | } |
1134 | ||
9830ad4c CG |
1135 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
1136 | __u32 fwmark) | |
f3723416 | 1137 | { |
5e6700b3 | 1138 | struct net *net = t->net; |
f3723416 ND |
1139 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1140 | ||
1141 | ipip6_tunnel_unlink(sitn, t); | |
1142 | synchronize_net(); | |
1143 | t->parms.iph.saddr = p->iph.saddr; | |
1144 | t->parms.iph.daddr = p->iph.daddr; | |
1145 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1146 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1147 | ipip6_tunnel_link(sitn, t); | |
1148 | t->parms.iph.ttl = p->iph.ttl; | |
1149 | t->parms.iph.tos = p->iph.tos; | |
f859b4af | 1150 | t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c | 1151 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
f3723416 | 1152 | t->parms.link = p->link; |
9830ad4c | 1153 | t->fwmark = fwmark; |
f3723416 ND |
1154 | ipip6_tunnel_bind_dev(t->dev); |
1155 | } | |
e09acddf | 1156 | dst_cache_reset(&t->dst_cache); |
f3723416 ND |
1157 | netdev_state_change(t->dev); |
1158 | } | |
1159 | ||
e2f1f072 ND |
1160 | #ifdef CONFIG_IPV6_SIT_6RD |
1161 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1162 | struct ip_tunnel_6rd *ip6rd) | |
1163 | { | |
1164 | struct in6_addr prefix; | |
1165 | __be32 relay_prefix; | |
1166 | ||
1167 | if (ip6rd->relay_prefixlen > 32 || | |
1168 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1169 | return -EINVAL; | |
1170 | ||
1171 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1172 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1173 | return -EINVAL; | |
1174 | if (ip6rd->relay_prefixlen) | |
1175 | relay_prefix = ip6rd->relay_prefix & | |
1176 | htonl(0xffffffffUL << | |
1177 | (32 - ip6rd->relay_prefixlen)); | |
1178 | else | |
1179 | relay_prefix = 0; | |
1180 | if (relay_prefix != ip6rd->relay_prefix) | |
1181 | return -EINVAL; | |
1182 | ||
1183 | t->ip6rd.prefix = prefix; | |
1184 | t->ip6rd.relay_prefix = relay_prefix; | |
1185 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1186 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
e09acddf | 1187 | dst_cache_reset(&t->dst_cache); |
e2f1f072 ND |
1188 | netdev_state_change(t->dev); |
1189 | return 0; | |
1190 | } | |
fd5d687b CH |
1191 | |
1192 | static int | |
1193 | ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) | |
1194 | { | |
1195 | struct ip_tunnel *t = netdev_priv(dev); | |
1196 | struct ip_tunnel_6rd ip6rd; | |
1197 | struct ip_tunnel_parm p; | |
1198 | ||
1199 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { | |
1200 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1201 | return -EFAULT; | |
1202 | t = ipip6_tunnel_locate(t->net, &p, 0); | |
1203 | } | |
1204 | if (!t) | |
1205 | t = netdev_priv(dev); | |
1206 | ||
1207 | ip6rd.prefix = t->ip6rd.prefix; | |
1208 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
1209 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1210 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1211 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) | |
1212 | return -EFAULT; | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | static int | |
1217 | ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1218 | { | |
1219 | struct ip_tunnel *t = netdev_priv(dev); | |
1220 | struct ip_tunnel_6rd ip6rd; | |
1221 | int err; | |
1222 | ||
1223 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) | |
1224 | return -EPERM; | |
1225 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd))) | |
1226 | return -EFAULT; | |
1227 | ||
1228 | if (cmd != SIOCDEL6RD) { | |
1229 | err = ipip6_tunnel_update_6rd(t, &ip6rd); | |
1230 | if (err < 0) | |
1231 | return err; | |
1232 | } else | |
1233 | ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | #endif /* CONFIG_IPV6_SIT_6RD */ | |
e2f1f072 | 1238 | |
03ff4979 | 1239 | static bool ipip6_valid_ip_proto(u8 ipproto) |
49dbe7ae SH |
1240 | { |
1241 | return ipproto == IPPROTO_IPV6 || | |
1242 | ipproto == IPPROTO_IPIP || | |
1243 | #if IS_ENABLED(CONFIG_MPLS) | |
1244 | ipproto == IPPROTO_MPLS || | |
1245 | #endif | |
1246 | ipproto == 0; | |
1247 | } | |
1248 | ||
1da177e4 | 1249 | static int |
fd5d687b | 1250 | __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) |
1da177e4 | 1251 | { |
fd5d687b CH |
1252 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1253 | return -EPERM; | |
1254 | ||
1255 | if (!ipip6_valid_ip_proto(p->iph.protocol)) | |
1256 | return -EINVAL; | |
1257 | if (p->iph.version != 4 || | |
1258 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) | |
1259 | return -EINVAL; | |
1260 | ||
1261 | if (p->iph.ttl) | |
1262 | p->iph.frag_off |= htons(IP_DF); | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | static int | |
f60fe2df | 1267 | ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1268 | { |
1269 | struct ip_tunnel *t = netdev_priv(dev); | |
fd5d687b | 1270 | |
f60fe2df CH |
1271 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) |
1272 | t = ipip6_tunnel_locate(t->net, p, 0); | |
fd5d687b CH |
1273 | if (!t) |
1274 | t = netdev_priv(dev); | |
f60fe2df | 1275 | memcpy(p, &t->parms, sizeof(*p)); |
fd5d687b CH |
1276 | return 0; |
1277 | } | |
1278 | ||
1279 | static int | |
f60fe2df | 1280 | ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b | 1281 | { |
9aad77c3 | 1282 | struct ip_tunnel *t = netdev_priv(dev); |
fd5d687b | 1283 | int err; |
1da177e4 | 1284 | |
f60fe2df | 1285 | err = __ipip6_tunnel_ioctl_validate(t->net, p); |
fd5d687b CH |
1286 | if (err) |
1287 | return err; | |
fa857afc | 1288 | |
f60fe2df | 1289 | t = ipip6_tunnel_locate(t->net, p, 1); |
fd5d687b CH |
1290 | if (!t) |
1291 | return -ENOBUFS; | |
fd5d687b CH |
1292 | return 0; |
1293 | } | |
1294 | ||
1295 | static int | |
f60fe2df | 1296 | ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1297 | { |
1298 | struct ip_tunnel *t = netdev_priv(dev); | |
fd5d687b CH |
1299 | int err; |
1300 | ||
f60fe2df | 1301 | err = __ipip6_tunnel_ioctl_validate(t->net, p); |
fd5d687b CH |
1302 | if (err) |
1303 | return err; | |
1304 | ||
f60fe2df | 1305 | t = ipip6_tunnel_locate(t->net, p, 0); |
fd5d687b CH |
1306 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { |
1307 | if (!t) | |
1308 | return -ENOENT; | |
1309 | } else { | |
1310 | if (t) { | |
1311 | if (t->dev != dev) | |
1312 | return -EEXIST; | |
fa857afc | 1313 | } else { |
f60fe2df CH |
1314 | if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || |
1315 | (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) | |
fd5d687b CH |
1316 | return -EINVAL; |
1317 | t = netdev_priv(dev); | |
fa857afc | 1318 | } |
1da177e4 | 1319 | |
f60fe2df | 1320 | ipip6_tunnel_update(t, p, t->fwmark); |
fd5d687b | 1321 | } |
1da177e4 | 1322 | |
fd5d687b CH |
1323 | return 0; |
1324 | } | |
f9cd5a55 | 1325 | |
fd5d687b | 1326 | static int |
f60fe2df | 1327 | ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) |
fd5d687b CH |
1328 | { |
1329 | struct ip_tunnel *t = netdev_priv(dev); | |
1da177e4 | 1330 | |
fd5d687b CH |
1331 | if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) |
1332 | return -EPERM; | |
1da177e4 | 1333 | |
fd5d687b | 1334 | if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { |
f60fe2df | 1335 | t = ipip6_tunnel_locate(t->net, p, 0); |
fd5d687b CH |
1336 | if (!t) |
1337 | return -ENOENT; | |
1338 | if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) | |
1339 | return -EPERM; | |
1340 | dev = t->dev; | |
1341 | } | |
1342 | unregister_netdevice(dev); | |
1343 | return 0; | |
1344 | } | |
1da177e4 | 1345 | |
f60fe2df CH |
1346 | static int |
1347 | ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
1348 | { | |
1349 | switch (cmd) { | |
1350 | case SIOCGETTUNNEL: | |
1351 | return ipip6_tunnel_get(dev, p); | |
1352 | case SIOCADDTUNNEL: | |
1353 | return ipip6_tunnel_add(dev, p); | |
1354 | case SIOCCHGTUNNEL: | |
1355 | return ipip6_tunnel_change(dev, p); | |
1356 | case SIOCDELTUNNEL: | |
1357 | return ipip6_tunnel_del(dev, p); | |
1358 | default: | |
1359 | return -EINVAL; | |
1360 | } | |
1361 | } | |
1362 | ||
fd5d687b CH |
1363 | static int |
1364 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1365 | { | |
1366 | switch (cmd) { | |
1367 | case SIOCGETTUNNEL: | |
fd5d687b | 1368 | case SIOCADDTUNNEL: |
fd5d687b | 1369 | case SIOCCHGTUNNEL: |
fd5d687b | 1370 | case SIOCDELTUNNEL: |
f60fe2df | 1371 | return ip_tunnel_ioctl(dev, ifr, cmd); |
300aaeea | 1372 | case SIOCGETPRL: |
fd5d687b | 1373 | return ipip6_tunnel_get_prl(dev, ifr); |
fadf6bf0 TF |
1374 | case SIOCADDPRL: |
1375 | case SIOCDELPRL: | |
1376 | case SIOCCHGPRL: | |
fd5d687b | 1377 | return ipip6_tunnel_prl_ctl(dev, ifr, cmd); |
fa857afc | 1378 | #ifdef CONFIG_IPV6_SIT_6RD |
fd5d687b CH |
1379 | case SIOCGET6RD: |
1380 | return ipip6_tunnel_get6rd(dev, ifr); | |
fa857afc YH |
1381 | case SIOCADD6RD: |
1382 | case SIOCCHG6RD: | |
1383 | case SIOCDEL6RD: | |
fd5d687b | 1384 | return ipip6_tunnel_6rdctl(dev, ifr, cmd); |
fa857afc | 1385 | #endif |
1da177e4 | 1386 | default: |
fd5d687b | 1387 | return -EINVAL; |
1da177e4 | 1388 | } |
1da177e4 LT |
1389 | } |
1390 | ||
1326c3d5 | 1391 | static const struct net_device_ops ipip6_netdev_ops = { |
ebe084aa | 1392 | .ndo_init = ipip6_tunnel_init, |
1326c3d5 | 1393 | .ndo_uninit = ipip6_tunnel_uninit, |
32b8a8e5 | 1394 | .ndo_start_xmit = sit_tunnel_xmit, |
1326c3d5 | 1395 | .ndo_do_ioctl = ipip6_tunnel_ioctl, |
98d7fc46 | 1396 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 1397 | .ndo_get_iflink = ip_tunnel_get_iflink, |
f60fe2df | 1398 | .ndo_tunnel_ctl = ipip6_tunnel_ctl, |
1326c3d5 SH |
1399 | }; |
1400 | ||
15fc1f70 ED |
1401 | static void ipip6_dev_free(struct net_device *dev) |
1402 | { | |
cf71d2bc ND |
1403 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1404 | ||
e09acddf | 1405 | dst_cache_destroy(&tunnel->dst_cache); |
15fc1f70 | 1406 | free_percpu(dev->tstats); |
15fc1f70 ED |
1407 | } |
1408 | ||
61c1db7f ED |
1409 | #define SIT_FEATURES (NETIF_F_SG | \ |
1410 | NETIF_F_FRAGLIST | \ | |
1411 | NETIF_F_HIGHDMA | \ | |
1412 | NETIF_F_GSO_SOFTWARE | \ | |
1413 | NETIF_F_HW_CSUM) | |
1414 | ||
1da177e4 LT |
1415 | static void ipip6_tunnel_setup(struct net_device *dev) |
1416 | { | |
14909664 TH |
1417 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1418 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1419 | ||
1326c3d5 | 1420 | dev->netdev_ops = &ipip6_netdev_ops; |
75ea1f47 | 1421 | dev->header_ops = &ip_tunnel_header_ops; |
cf124db5 DM |
1422 | dev->needs_free_netdev = true; |
1423 | dev->priv_destructor = ipip6_dev_free; | |
1da177e4 LT |
1424 | |
1425 | dev->type = ARPHRD_SIT; | |
14909664 | 1426 | dev->mtu = ETH_DATA_LEN - t_hlen; |
b96f9afe | 1427 | dev->min_mtu = IPV6_MIN_MTU; |
f7ff1fde | 1428 | dev->max_mtu = IP6_MAX_MTU - t_hlen; |
1da177e4 | 1429 | dev->flags = IFF_NOARP; |
02875878 | 1430 | netif_keep_dst(dev); |
1da177e4 | 1431 | dev->addr_len = 4; |
8df40d10 | 1432 | dev->features |= NETIF_F_LLTX; |
61c1db7f ED |
1433 | dev->features |= SIT_FEATURES; |
1434 | dev->hw_features |= SIT_FEATURES; | |
1da177e4 LT |
1435 | } |
1436 | ||
15fc1f70 | 1437 | static int ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1438 | { |
1326c3d5 | 1439 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e09acddf | 1440 | int err; |
1da177e4 LT |
1441 | |
1442 | tunnel->dev = dev; | |
5e6700b3 | 1443 | tunnel->net = dev_net(dev); |
ebe084aa | 1444 | strcpy(tunnel->parms.name, dev->name); |
1da177e4 | 1445 | |
8a4a50f9 | 1446 | ipip6_tunnel_bind_dev(dev); |
1c213bd2 | 1447 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
15fc1f70 ED |
1448 | if (!dev->tstats) |
1449 | return -ENOMEM; | |
1450 | ||
e09acddf PA |
1451 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1452 | if (err) { | |
cf71d2bc | 1453 | free_percpu(dev->tstats); |
d7426c69 | 1454 | dev->tstats = NULL; |
e09acddf | 1455 | return err; |
cf71d2bc | 1456 | } |
6289a98f | 1457 | dev_hold(dev); |
15fc1f70 | 1458 | return 0; |
1da177e4 LT |
1459 | } |
1460 | ||
4ece9009 | 1461 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1462 | { |
2941a486 | 1463 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1464 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1465 | struct net *net = dev_net(dev); |
1466 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 | 1467 | |
1da177e4 LT |
1468 | iph->version = 4; |
1469 | iph->protocol = IPPROTO_IPV6; | |
1470 | iph->ihl = 5; | |
1471 | iph->ttl = 64; | |
1472 | ||
cf778b00 | 1473 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
1da177e4 LT |
1474 | } |
1475 | ||
a8b8a889 MS |
1476 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
1477 | struct netlink_ext_ack *extack) | |
32b8a8e5 ND |
1478 | { |
1479 | u8 proto; | |
1480 | ||
c2ff682a | 1481 | if (!data || !data[IFLA_IPTUN_PROTO]) |
32b8a8e5 ND |
1482 | return 0; |
1483 | ||
1484 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
49dbe7ae | 1485 | if (!ipip6_valid_ip_proto(proto)) |
32b8a8e5 ND |
1486 | return -EINVAL; |
1487 | ||
1488 | return 0; | |
1489 | } | |
1490 | ||
f3723416 | 1491 | static void ipip6_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
1492 | struct ip_tunnel_parm *parms, |
1493 | __u32 *fwmark) | |
f3723416 ND |
1494 | { |
1495 | memset(parms, 0, sizeof(*parms)); | |
1496 | ||
1497 | parms->iph.version = 4; | |
1498 | parms->iph.protocol = IPPROTO_IPV6; | |
1499 | parms->iph.ihl = 5; | |
1500 | parms->iph.ttl = 64; | |
1501 | ||
1502 | if (!data) | |
1503 | return; | |
1504 | ||
1505 | if (data[IFLA_IPTUN_LINK]) | |
1506 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1507 | ||
1508 | if (data[IFLA_IPTUN_LOCAL]) | |
d440b720 | 1509 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
f3723416 ND |
1510 | |
1511 | if (data[IFLA_IPTUN_REMOTE]) | |
d440b720 | 1512 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
f3723416 ND |
1513 | |
1514 | if (data[IFLA_IPTUN_TTL]) { | |
1515 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1516 | if (parms->iph.ttl) | |
1517 | parms->iph.frag_off = htons(IP_DF); | |
1518 | } | |
1519 | ||
1520 | if (data[IFLA_IPTUN_TOS]) | |
1521 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1522 | ||
1523 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1524 | parms->iph.frag_off = htons(IP_DF); | |
1525 | ||
1526 | if (data[IFLA_IPTUN_FLAGS]) | |
d440b720 | 1527 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
32b8a8e5 ND |
1528 | |
1529 | if (data[IFLA_IPTUN_PROTO]) | |
1530 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1531 | ||
9830ad4c CG |
1532 | if (data[IFLA_IPTUN_FWMARK]) |
1533 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
f3723416 ND |
1534 | } |
1535 | ||
14909664 TH |
1536 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1537 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1538 | struct ip_tunnel_encap *ipencap) | |
1539 | { | |
1540 | bool ret = false; | |
1541 | ||
1542 | memset(ipencap, 0, sizeof(*ipencap)); | |
1543 | ||
1544 | if (!data) | |
1545 | return ret; | |
1546 | ||
1547 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1548 | ret = true; | |
1549 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1550 | } | |
1551 | ||
1552 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1553 | ret = true; | |
1554 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1555 | } | |
1556 | ||
1557 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1558 | ret = true; | |
a409caec | 1559 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
14909664 TH |
1560 | } |
1561 | ||
1562 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1563 | ret = true; | |
a409caec | 1564 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
14909664 TH |
1565 | } |
1566 | ||
1567 | return ret; | |
1568 | } | |
1569 | ||
e2f1f072 ND |
1570 | #ifdef CONFIG_IPV6_SIT_6RD |
1571 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1572 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1573 | struct ip_tunnel_6rd *ip6rd) | |
1574 | { | |
1575 | bool ret = false; | |
1576 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1577 | ||
1578 | if (!data) | |
1579 | return ret; | |
1580 | ||
1581 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1582 | ret = true; | |
67b61f6c | 1583 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
e2f1f072 ND |
1584 | } |
1585 | ||
1586 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1587 | ret = true; | |
1588 | ip6rd->relay_prefix = | |
1589 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1590 | } | |
1591 | ||
1592 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1593 | ret = true; | |
1594 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1595 | } | |
1596 | ||
1597 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1598 | ret = true; | |
1599 | ip6rd->relay_prefixlen = | |
1600 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1601 | } | |
1602 | ||
1603 | return ret; | |
1604 | } | |
1605 | #endif | |
1606 | ||
f3723416 | 1607 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1608 | struct nlattr *tb[], struct nlattr *data[], |
1609 | struct netlink_ext_ack *extack) | |
f3723416 ND |
1610 | { |
1611 | struct net *net = dev_net(dev); | |
1612 | struct ip_tunnel *nt; | |
14909664 | 1613 | struct ip_tunnel_encap ipencap; |
e2f1f072 ND |
1614 | #ifdef CONFIG_IPV6_SIT_6RD |
1615 | struct ip_tunnel_6rd ip6rd; | |
1616 | #endif | |
1617 | int err; | |
f3723416 ND |
1618 | |
1619 | nt = netdev_priv(dev); | |
14909664 TH |
1620 | |
1621 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1622 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1623 | if (err < 0) | |
1624 | return err; | |
1625 | } | |
1626 | ||
9830ad4c | 1627 | ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
f3723416 ND |
1628 | |
1629 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1630 | return -EEXIST; | |
1631 | ||
e2f1f072 ND |
1632 | err = ipip6_tunnel_create(dev); |
1633 | if (err < 0) | |
1634 | return err; | |
1635 | ||
2b3957c3 XL |
1636 | if (tb[IFLA_MTU]) { |
1637 | u32 mtu = nla_get_u32(tb[IFLA_MTU]); | |
1638 | ||
f7ff1fde ND |
1639 | if (mtu >= IPV6_MIN_MTU && |
1640 | mtu <= IP6_MAX_MTU - dev->hard_header_len) | |
2b3957c3 XL |
1641 | dev->mtu = mtu; |
1642 | } | |
1643 | ||
e2f1f072 | 1644 | #ifdef CONFIG_IPV6_SIT_6RD |
47e4bb14 | 1645 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) { |
e2f1f072 | 1646 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); |
47e4bb14 JK |
1647 | if (err < 0) |
1648 | unregister_netdevice_queue(dev, NULL); | |
1649 | } | |
e2f1f072 ND |
1650 | #endif |
1651 | ||
1652 | return err; | |
f3723416 ND |
1653 | } |
1654 | ||
1655 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
1656 | struct nlattr *data[], |
1657 | struct netlink_ext_ack *extack) | |
f3723416 | 1658 | { |
86bd68bf | 1659 | struct ip_tunnel *t = netdev_priv(dev); |
f3723416 | 1660 | struct ip_tunnel_parm p; |
14909664 | 1661 | struct ip_tunnel_encap ipencap; |
86bd68bf | 1662 | struct net *net = t->net; |
f3723416 | 1663 | struct sit_net *sitn = net_generic(net, sit_net_id); |
e2f1f072 ND |
1664 | #ifdef CONFIG_IPV6_SIT_6RD |
1665 | struct ip_tunnel_6rd ip6rd; | |
1666 | #endif | |
9830ad4c | 1667 | __u32 fwmark = t->fwmark; |
14909664 | 1668 | int err; |
f3723416 ND |
1669 | |
1670 | if (dev == sitn->fb_tunnel_dev) | |
1671 | return -EINVAL; | |
1672 | ||
14909664 TH |
1673 | if (ipip6_netlink_encap_parms(data, &ipencap)) { |
1674 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1675 | if (err < 0) | |
1676 | return err; | |
1677 | } | |
1678 | ||
9830ad4c | 1679 | ipip6_netlink_parms(data, &p, &fwmark); |
f3723416 ND |
1680 | |
1681 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1682 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1683 | return -EINVAL; | |
1684 | ||
1685 | t = ipip6_tunnel_locate(net, &p, 0); | |
1686 | ||
1687 | if (t) { | |
1688 | if (t->dev != dev) | |
1689 | return -EEXIST; | |
1690 | } else | |
1691 | t = netdev_priv(dev); | |
1692 | ||
9830ad4c | 1693 | ipip6_tunnel_update(t, &p, fwmark); |
e2f1f072 ND |
1694 | |
1695 | #ifdef CONFIG_IPV6_SIT_6RD | |
1696 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1697 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1698 | #endif | |
1699 | ||
f3723416 ND |
1700 | return 0; |
1701 | } | |
1702 | ||
e4c94a9c | 1703 | static size_t ipip6_get_size(const struct net_device *dev) |
ba3e3f50 ND |
1704 | { |
1705 | return | |
1706 | /* IFLA_IPTUN_LINK */ | |
1707 | nla_total_size(4) + | |
1708 | /* IFLA_IPTUN_LOCAL */ | |
1709 | nla_total_size(4) + | |
1710 | /* IFLA_IPTUN_REMOTE */ | |
1711 | nla_total_size(4) + | |
1712 | /* IFLA_IPTUN_TTL */ | |
1713 | nla_total_size(1) + | |
1714 | /* IFLA_IPTUN_TOS */ | |
1715 | nla_total_size(1) + | |
a12c9a85 ND |
1716 | /* IFLA_IPTUN_PMTUDISC */ |
1717 | nla_total_size(1) + | |
1718 | /* IFLA_IPTUN_FLAGS */ | |
1719 | nla_total_size(2) + | |
32b8a8e5 ND |
1720 | /* IFLA_IPTUN_PROTO */ |
1721 | nla_total_size(1) + | |
e2f1f072 ND |
1722 | #ifdef CONFIG_IPV6_SIT_6RD |
1723 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1724 | nla_total_size(sizeof(struct in6_addr)) + | |
1725 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1726 | nla_total_size(4) + | |
1727 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1728 | nla_total_size(2) + | |
1729 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1730 | nla_total_size(2) + | |
1731 | #endif | |
14909664 TH |
1732 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1733 | nla_total_size(2) + | |
1734 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1735 | nla_total_size(2) + | |
1736 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1737 | nla_total_size(2) + | |
1738 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1739 | nla_total_size(2) + | |
9830ad4c CG |
1740 | /* IFLA_IPTUN_FWMARK */ |
1741 | nla_total_size(4) + | |
ba3e3f50 ND |
1742 | 0; |
1743 | } | |
1744 | ||
e4c94a9c | 1745 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
ba3e3f50 ND |
1746 | { |
1747 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1748 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1749 | ||
1750 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1751 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
1752 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
ba3e3f50 | 1753 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
a12c9a85 ND |
1754 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1755 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1756 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
32b8a8e5 | 1757 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
9830ad4c CG |
1758 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
1759 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
ba3e3f50 | 1760 | goto nla_put_failure; |
e2f1f072 ND |
1761 | |
1762 | #ifdef CONFIG_IPV6_SIT_6RD | |
930345ea JB |
1763 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
1764 | &tunnel->ip6rd.prefix) || | |
1765 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1766 | tunnel->ip6rd.relay_prefix) || | |
e2f1f072 ND |
1767 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
1768 | tunnel->ip6rd.prefixlen) || | |
1769 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1770 | tunnel->ip6rd.relay_prefixlen)) | |
1771 | goto nla_put_failure; | |
1772 | #endif | |
1773 | ||
14909664 TH |
1774 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
1775 | tunnel->encap.type) || | |
a409caec | 1776 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
14909664 | 1777 | tunnel->encap.sport) || |
a409caec | 1778 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
14909664 TH |
1779 | tunnel->encap.dport) || |
1780 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
e1b2cb65 | 1781 | tunnel->encap.flags)) |
14909664 TH |
1782 | goto nla_put_failure; |
1783 | ||
ba3e3f50 ND |
1784 | return 0; |
1785 | ||
1786 | nla_put_failure: | |
1787 | return -EMSGSIZE; | |
1788 | } | |
1789 | ||
f3723416 ND |
1790 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
1791 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1792 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1793 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1794 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1795 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1796 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1797 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
32b8a8e5 | 1798 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
e2f1f072 ND |
1799 | #ifdef CONFIG_IPV6_SIT_6RD |
1800 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1801 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1802 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1803 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1804 | #endif | |
14909664 TH |
1805 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1806 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1807 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1808 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
9830ad4c | 1809 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
f3723416 ND |
1810 | }; |
1811 | ||
9434266f WB |
1812 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
1813 | { | |
1814 | struct net *net = dev_net(dev); | |
1815 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1816 | ||
1817 | if (dev != sitn->fb_tunnel_dev) | |
1818 | unregister_netdevice_queue(dev, head); | |
1819 | } | |
1820 | ||
ba3e3f50 ND |
1821 | static struct rtnl_link_ops sit_link_ops __read_mostly = { |
1822 | .kind = "sit", | |
1823 | .maxtype = IFLA_IPTUN_MAX, | |
f3723416 | 1824 | .policy = ipip6_policy, |
ba3e3f50 | 1825 | .priv_size = sizeof(struct ip_tunnel), |
f3723416 | 1826 | .setup = ipip6_tunnel_setup, |
32b8a8e5 | 1827 | .validate = ipip6_validate, |
f3723416 ND |
1828 | .newlink = ipip6_newlink, |
1829 | .changelink = ipip6_changelink, | |
e4c94a9c ND |
1830 | .get_size = ipip6_get_size, |
1831 | .fill_info = ipip6_fill_info, | |
9434266f | 1832 | .dellink = ipip6_dellink, |
1728d4fa | 1833 | .get_link_net = ip_tunnel_get_link_net, |
ba3e3f50 ND |
1834 | }; |
1835 | ||
6dcd814b | 1836 | static struct xfrm_tunnel sit_handler __read_mostly = { |
1da177e4 LT |
1837 | .handler = ipip6_rcv, |
1838 | .err_handler = ipip6_err, | |
c73cb5a2 | 1839 | .priority = 1, |
1da177e4 LT |
1840 | }; |
1841 | ||
32b8a8e5 ND |
1842 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1843 | .handler = ipip_rcv, | |
1844 | .err_handler = ipip6_err, | |
1845 | .priority = 2, | |
1846 | }; | |
1847 | ||
49dbe7ae SH |
1848 | #if IS_ENABLED(CONFIG_MPLS) |
1849 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
1850 | .handler = mplsip_rcv, | |
1851 | .err_handler = ipip6_err, | |
1852 | .priority = 2, | |
1853 | }; | |
1854 | #endif | |
1855 | ||
9434266f WB |
1856 | static void __net_exit sit_destroy_tunnels(struct net *net, |
1857 | struct list_head *head) | |
db44575f | 1858 | { |
9434266f | 1859 | struct sit_net *sitn = net_generic(net, sit_net_id); |
5e6700b3 | 1860 | struct net_device *dev, *aux; |
db44575f AK |
1861 | int prio; |
1862 | ||
5e6700b3 ND |
1863 | for_each_netdev_safe(net, dev, aux) |
1864 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1865 | unregister_netdevice_queue(dev, head); | |
1866 | ||
610f8c0f | 1867 | for (prio = 0; prio < 4; prio++) { |
db44575f | 1868 | int h; |
610f8c0f | 1869 | for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { |
753ea8e9 | 1870 | struct ip_tunnel *t; |
62808f91 | 1871 | |
753ea8e9 | 1872 | t = rtnl_dereference(sitn->tunnels[prio][h]); |
53b24b8f | 1873 | while (t) { |
5e6700b3 ND |
1874 | /* If dev is in the same netns, it has already |
1875 | * been added to the list by the previous loop. | |
1876 | */ | |
fc8f999d | 1877 | if (!net_eq(dev_net(t->dev), net)) |
5e6700b3 ND |
1878 | unregister_netdevice_queue(t->dev, |
1879 | head); | |
753ea8e9 | 1880 | t = rtnl_dereference(t->next); |
62808f91 | 1881 | } |
db44575f AK |
1882 | } |
1883 | } | |
1884 | } | |
1885 | ||
2c8c1e72 | 1886 | static int __net_init sit_init_net(struct net *net) |
8190d900 | 1887 | { |
67101172 | 1888 | struct sit_net *sitn = net_generic(net, sit_net_id); |
72b36015 | 1889 | struct ip_tunnel *t; |
8190d900 | 1890 | int err; |
8190d900 | 1891 | |
29182176 PE |
1892 | sitn->tunnels[0] = sitn->tunnels_wc; |
1893 | sitn->tunnels[1] = sitn->tunnels_l; | |
1894 | sitn->tunnels[2] = sitn->tunnels_r; | |
1895 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1896 | ||
79134e6c ED |
1897 | if (!net_has_fallback_tunnels(net)) |
1898 | return 0; | |
1899 | ||
cd3dbc19 | 1900 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
c835a677 | 1901 | NET_NAME_UNKNOWN, |
cd3dbc19 PE |
1902 | ipip6_tunnel_setup); |
1903 | if (!sitn->fb_tunnel_dev) { | |
1904 | err = -ENOMEM; | |
1905 | goto err_alloc_dev; | |
1906 | } | |
be77e593 | 1907 | dev_net_set(sitn->fb_tunnel_dev, net); |
205983c4 | 1908 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
5e6700b3 ND |
1909 | /* FB netdevice is special: we have one, and only one per netns. |
1910 | * Allowing to move it to another netns is clearly unsafe. | |
1911 | */ | |
1912 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
cd3dbc19 | 1913 | |
e5d08d71 IM |
1914 | err = register_netdev(sitn->fb_tunnel_dev); |
1915 | if (err) | |
cd3dbc19 PE |
1916 | goto err_reg_dev; |
1917 | ||
4ece9009 ED |
1918 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
1919 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1920 | ||
72b36015 TF |
1921 | t = netdev_priv(sitn->fb_tunnel_dev); |
1922 | ||
1923 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
8190d900 PE |
1924 | return 0; |
1925 | ||
cd3dbc19 | 1926 | err_reg_dev: |
dd4080ee | 1927 | ipip6_dev_free(sitn->fb_tunnel_dev); |
07f12b26 | 1928 | free_netdev(sitn->fb_tunnel_dev); |
cd3dbc19 | 1929 | err_alloc_dev: |
8190d900 PE |
1930 | return err; |
1931 | } | |
1932 | ||
bb401cae | 1933 | static void __net_exit sit_exit_batch_net(struct list_head *net_list) |
8190d900 | 1934 | { |
62808f91 | 1935 | LIST_HEAD(list); |
bb401cae | 1936 | struct net *net; |
8190d900 | 1937 | |
cd3dbc19 | 1938 | rtnl_lock(); |
bb401cae ED |
1939 | list_for_each_entry(net, net_list, exit_list) |
1940 | sit_destroy_tunnels(net, &list); | |
1941 | ||
62808f91 | 1942 | unregister_netdevice_many(&list); |
cd3dbc19 | 1943 | rtnl_unlock(); |
8190d900 PE |
1944 | } |
1945 | ||
1946 | static struct pernet_operations sit_net_ops = { | |
1947 | .init = sit_init_net, | |
bb401cae | 1948 | .exit_batch = sit_exit_batch_net, |
67101172 EB |
1949 | .id = &sit_net_id, |
1950 | .size = sizeof(struct sit_net), | |
8190d900 PE |
1951 | }; |
1952 | ||
89c89458 | 1953 | static void __exit sit_cleanup(void) |
1da177e4 | 1954 | { |
ba3e3f50 | 1955 | rtnl_link_unregister(&sit_link_ops); |
c73cb5a2 | 1956 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
32b8a8e5 | 1957 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
49dbe7ae SH |
1958 | #if IS_ENABLED(CONFIG_MPLS) |
1959 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
1960 | #endif | |
db44575f | 1961 | |
67101172 | 1962 | unregister_pernet_device(&sit_net_ops); |
ef9a9d11 | 1963 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
1964 | } |
1965 | ||
89c89458 | 1966 | static int __init sit_init(void) |
1da177e4 LT |
1967 | { |
1968 | int err; | |
1969 | ||
49dbe7ae | 1970 | pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 1971 | |
67101172 | 1972 | err = register_pernet_device(&sit_net_ops); |
8190d900 | 1973 | if (err < 0) |
d5aa407f AD |
1974 | return err; |
1975 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1976 | if (err < 0) { | |
32b8a8e5 | 1977 | pr_info("%s: can't register ip6ip4\n", __func__); |
ba3e3f50 | 1978 | goto xfrm_tunnel_failed; |
d5aa407f | 1979 | } |
32b8a8e5 ND |
1980 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
1981 | if (err < 0) { | |
1982 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1983 | goto xfrm_tunnel4_failed; | |
1984 | } | |
49dbe7ae SH |
1985 | #if IS_ENABLED(CONFIG_MPLS) |
1986 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
1987 | if (err < 0) { | |
1988 | pr_info("%s: can't register mplsip\n", __func__); | |
1989 | goto xfrm_tunnel_mpls_failed; | |
1990 | } | |
1991 | #endif | |
ba3e3f50 ND |
1992 | err = rtnl_link_register(&sit_link_ops); |
1993 | if (err < 0) | |
1994 | goto rtnl_link_failed; | |
1995 | ||
1996 | out: | |
1da177e4 | 1997 | return err; |
ba3e3f50 ND |
1998 | |
1999 | rtnl_link_failed: | |
49dbe7ae SH |
2000 | #if IS_ENABLED(CONFIG_MPLS) |
2001 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); | |
2002 | xfrm_tunnel_mpls_failed: | |
2003 | #endif | |
32b8a8e5 ND |
2004 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
2005 | xfrm_tunnel4_failed: | |
ba3e3f50 ND |
2006 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
2007 | xfrm_tunnel_failed: | |
2008 | unregister_pernet_device(&sit_net_ops); | |
2009 | goto out; | |
1da177e4 | 2010 | } |
989e5b96 JR |
2011 | |
2012 | module_init(sit_init); | |
2013 | module_exit(sit_cleanup); | |
39c85086 | 2014 | MODULE_LICENSE("GPL"); |
f98f89a0 | 2015 | MODULE_ALIAS_RTNL_LINK("sit"); |
8909c9ad | 2016 | MODULE_ALIAS_NETDEV("sit0"); |