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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * | |
9 | * $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $ | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * Changes: | |
17 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
18 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
19 | */ | |
20 | ||
1da177e4 | 21 | #include <linux/module.h> |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/errno.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/socket.h> | |
26 | #include <linux/sockios.h> | |
1da177e4 LT |
27 | #include <linux/net.h> |
28 | #include <linux/in6.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/icmp.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 35 | #include <linux/if_ether.h> |
1da177e4 LT |
36 | |
37 | #include <net/sock.h> | |
38 | #include <net/snmp.h> | |
39 | ||
40 | #include <net/ipv6.h> | |
41 | #include <net/protocol.h> | |
42 | #include <net/transp_v6.h> | |
43 | #include <net/ip6_fib.h> | |
44 | #include <net/ip6_route.h> | |
45 | #include <net/ndisc.h> | |
46 | #include <net/addrconf.h> | |
47 | #include <net/ip.h> | |
48 | #include <net/udp.h> | |
49 | #include <net/icmp.h> | |
50 | #include <net/ipip.h> | |
51 | #include <net/inet_ecn.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/dsfield.h> | |
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 | ||
61 | #define HASH_SIZE 16 | |
e69a4adc | 62 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 LT |
63 | |
64 | static int ipip6_fb_tunnel_init(struct net_device *dev); | |
65 | static int ipip6_tunnel_init(struct net_device *dev); | |
66 | static void ipip6_tunnel_setup(struct net_device *dev); | |
67 | ||
68 | static struct net_device *ipip6_fb_tunnel_dev; | |
69 | ||
70 | static struct ip_tunnel *tunnels_r_l[HASH_SIZE]; | |
71 | static struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
72 | static struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
73 | static struct ip_tunnel *tunnels_wc[1]; | |
74 | static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l }; | |
75 | ||
76 | static DEFINE_RWLOCK(ipip6_lock); | |
77 | ||
e69a4adc | 78 | static struct ip_tunnel * ipip6_tunnel_lookup(__be32 remote, __be32 local) |
1da177e4 LT |
79 | { |
80 | unsigned h0 = HASH(remote); | |
81 | unsigned h1 = HASH(local); | |
82 | struct ip_tunnel *t; | |
83 | ||
84 | for (t = tunnels_r_l[h0^h1]; t; t = t->next) { | |
85 | if (local == t->parms.iph.saddr && | |
86 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
87 | return t; | |
88 | } | |
89 | for (t = tunnels_r[h0]; t; t = t->next) { | |
90 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
91 | return t; | |
92 | } | |
93 | for (t = tunnels_l[h1]; t; t = t->next) { | |
94 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) | |
95 | return t; | |
96 | } | |
97 | if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) | |
98 | return t; | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t) | |
103 | { | |
e69a4adc AV |
104 | __be32 remote = t->parms.iph.daddr; |
105 | __be32 local = t->parms.iph.saddr; | |
1da177e4 LT |
106 | unsigned h = 0; |
107 | int prio = 0; | |
108 | ||
109 | if (remote) { | |
110 | prio |= 2; | |
111 | h ^= HASH(remote); | |
112 | } | |
113 | if (local) { | |
114 | prio |= 1; | |
115 | h ^= HASH(local); | |
116 | } | |
117 | return &tunnels[prio][h]; | |
118 | } | |
119 | ||
120 | static void ipip6_tunnel_unlink(struct ip_tunnel *t) | |
121 | { | |
122 | struct ip_tunnel **tp; | |
123 | ||
124 | for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) { | |
125 | if (t == *tp) { | |
126 | write_lock_bh(&ipip6_lock); | |
127 | *tp = t->next; | |
128 | write_unlock_bh(&ipip6_lock); | |
129 | break; | |
130 | } | |
131 | } | |
132 | } | |
133 | ||
134 | static void ipip6_tunnel_link(struct ip_tunnel *t) | |
135 | { | |
136 | struct ip_tunnel **tp = ipip6_bucket(t); | |
137 | ||
138 | t->next = *tp; | |
139 | write_lock_bh(&ipip6_lock); | |
140 | *tp = t; | |
141 | write_unlock_bh(&ipip6_lock); | |
142 | } | |
143 | ||
144 | static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create) | |
145 | { | |
e69a4adc AV |
146 | __be32 remote = parms->iph.daddr; |
147 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
148 | struct ip_tunnel *t, **tp, *nt; |
149 | struct net_device *dev; | |
150 | unsigned h = 0; | |
151 | int prio = 0; | |
152 | char name[IFNAMSIZ]; | |
153 | ||
154 | if (remote) { | |
155 | prio |= 2; | |
156 | h ^= HASH(remote); | |
157 | } | |
158 | if (local) { | |
159 | prio |= 1; | |
160 | h ^= HASH(local); | |
161 | } | |
162 | for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) { | |
163 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) | |
164 | return t; | |
165 | } | |
166 | if (!create) | |
167 | goto failed; | |
168 | ||
169 | if (parms->name[0]) | |
170 | strlcpy(name, parms->name, IFNAMSIZ); | |
171 | else { | |
172 | int i; | |
173 | for (i=1; i<100; i++) { | |
174 | sprintf(name, "sit%d", i); | |
175 | if (__dev_get_by_name(name) == NULL) | |
176 | break; | |
177 | } | |
178 | if (i==100) | |
179 | goto failed; | |
180 | } | |
181 | ||
182 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
183 | if (dev == NULL) | |
184 | return NULL; | |
185 | ||
2941a486 | 186 | nt = netdev_priv(dev); |
1da177e4 LT |
187 | dev->init = ipip6_tunnel_init; |
188 | nt->parms = *parms; | |
189 | ||
190 | if (register_netdevice(dev) < 0) { | |
191 | free_netdev(dev); | |
192 | goto failed; | |
193 | } | |
194 | ||
195 | dev_hold(dev); | |
196 | ||
197 | ipip6_tunnel_link(nt); | |
1da177e4 LT |
198 | return nt; |
199 | ||
200 | failed: | |
201 | return NULL; | |
202 | } | |
203 | ||
204 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
205 | { | |
206 | if (dev == ipip6_fb_tunnel_dev) { | |
207 | write_lock_bh(&ipip6_lock); | |
208 | tunnels_wc[0] = NULL; | |
209 | write_unlock_bh(&ipip6_lock); | |
210 | dev_put(dev); | |
211 | } else { | |
2941a486 | 212 | ipip6_tunnel_unlink(netdev_priv(dev)); |
1da177e4 LT |
213 | dev_put(dev); |
214 | } | |
215 | } | |
216 | ||
217 | ||
c73cb5a2 | 218 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 LT |
219 | { |
220 | #ifndef I_WISH_WORLD_WERE_PERFECT | |
221 | ||
222 | /* It is not :-( All the routers (except for Linux) return only | |
223 | 8 bytes of packet payload. It means, that precise relaying of | |
224 | ICMP in the real Internet is absolutely infeasible. | |
225 | */ | |
226 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
227 | const int type = icmp_hdr(skb)->type; |
228 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 229 | struct ip_tunnel *t; |
c73cb5a2 | 230 | int err; |
1da177e4 LT |
231 | |
232 | switch (type) { | |
233 | default: | |
234 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 235 | return 0; |
1da177e4 LT |
236 | |
237 | case ICMP_DEST_UNREACH: | |
238 | switch (code) { | |
239 | case ICMP_SR_FAILED: | |
240 | case ICMP_PORT_UNREACH: | |
241 | /* Impossible event. */ | |
c73cb5a2 | 242 | return 0; |
1da177e4 LT |
243 | case ICMP_FRAG_NEEDED: |
244 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 245 | return 0; |
1da177e4 LT |
246 | default: |
247 | /* All others are translated to HOST_UNREACH. | |
248 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
249 | I believe they are just ether pollution. --ANK | |
250 | */ | |
251 | break; | |
252 | } | |
253 | break; | |
254 | case ICMP_TIME_EXCEEDED: | |
255 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 256 | return 0; |
1da177e4 LT |
257 | break; |
258 | } | |
259 | ||
c73cb5a2 KM |
260 | err = -ENOENT; |
261 | ||
1da177e4 LT |
262 | read_lock(&ipip6_lock); |
263 | t = ipip6_tunnel_lookup(iph->daddr, iph->saddr); | |
264 | if (t == NULL || t->parms.iph.daddr == 0) | |
265 | goto out; | |
c73cb5a2 KM |
266 | |
267 | err = 0; | |
1da177e4 LT |
268 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
269 | goto out; | |
270 | ||
271 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
272 | t->err_count++; | |
273 | else | |
274 | t->err_count = 1; | |
275 | t->err_time = jiffies; | |
276 | out: | |
277 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 278 | return err; |
1da177e4 LT |
279 | #else |
280 | struct iphdr *iph = (struct iphdr*)dp; | |
281 | int hlen = iph->ihl<<2; | |
282 | struct ipv6hdr *iph6; | |
88c7664f ACM |
283 | const int type = icmp_hdr(skb)->type; |
284 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
285 | int rel_type = 0; |
286 | int rel_code = 0; | |
287 | int rel_info = 0; | |
288 | struct sk_buff *skb2; | |
289 | struct rt6_info *rt6i; | |
290 | ||
291 | if (len < hlen + sizeof(struct ipv6hdr)) | |
292 | return; | |
293 | iph6 = (struct ipv6hdr*)(dp + hlen); | |
294 | ||
295 | switch (type) { | |
296 | default: | |
297 | return; | |
298 | case ICMP_PARAMETERPROB: | |
88c7664f | 299 | if (icmp_hdr(skb)->un.gateway < hlen) |
1da177e4 LT |
300 | return; |
301 | ||
302 | /* So... This guy found something strange INSIDE encapsulated | |
303 | packet. Well, he is fool, but what can we do ? | |
304 | */ | |
305 | rel_type = ICMPV6_PARAMPROB; | |
88c7664f | 306 | rel_info = icmp_hdr(skb)->un.gateway - hlen; |
1da177e4 LT |
307 | break; |
308 | ||
309 | case ICMP_DEST_UNREACH: | |
310 | switch (code) { | |
311 | case ICMP_SR_FAILED: | |
312 | case ICMP_PORT_UNREACH: | |
313 | /* Impossible event. */ | |
314 | return; | |
315 | case ICMP_FRAG_NEEDED: | |
316 | /* Too complicated case ... */ | |
317 | return; | |
318 | default: | |
319 | /* All others are translated to HOST_UNREACH. | |
320 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
321 | I believe, it is just ether pollution. --ANK | |
322 | */ | |
323 | rel_type = ICMPV6_DEST_UNREACH; | |
324 | rel_code = ICMPV6_ADDR_UNREACH; | |
325 | break; | |
326 | } | |
327 | break; | |
328 | case ICMP_TIME_EXCEEDED: | |
329 | if (code != ICMP_EXC_TTL) | |
330 | return; | |
331 | rel_type = ICMPV6_TIME_EXCEED; | |
332 | rel_code = ICMPV6_EXC_HOPLIMIT; | |
333 | break; | |
334 | } | |
335 | ||
336 | /* Prepare fake skb to feed it to icmpv6_send */ | |
337 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
338 | if (skb2 == NULL) | |
c73cb5a2 | 339 | return 0; |
1da177e4 LT |
340 | dst_release(skb2->dst); |
341 | skb2->dst = NULL; | |
342 | skb_pull(skb2, skb->data - (u8*)iph6); | |
c1d2bbe1 | 343 | skb_reset_network_header(skb2); |
1da177e4 LT |
344 | |
345 | /* Try to guess incoming interface */ | |
346 | rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0); | |
347 | if (rt6i && rt6i->rt6i_dev) { | |
348 | skb2->dev = rt6i->rt6i_dev; | |
349 | ||
350 | rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0); | |
351 | ||
352 | if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) { | |
2941a486 | 353 | struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev); |
1da177e4 LT |
354 | if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) { |
355 | rel_type = ICMPV6_DEST_UNREACH; | |
356 | rel_code = ICMPV6_ADDR_UNREACH; | |
357 | } | |
358 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
359 | } | |
360 | } | |
361 | kfree_skb(skb2); | |
c73cb5a2 | 362 | return 0; |
1da177e4 LT |
363 | #endif |
364 | } | |
365 | ||
366 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
367 | { | |
368 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 369 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
370 | } |
371 | ||
372 | static int ipip6_rcv(struct sk_buff *skb) | |
373 | { | |
374 | struct iphdr *iph; | |
375 | struct ip_tunnel *tunnel; | |
376 | ||
377 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
378 | goto out; | |
379 | ||
eddc9ec5 | 380 | iph = ip_hdr(skb); |
1da177e4 LT |
381 | |
382 | read_lock(&ipip6_lock); | |
383 | if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) { | |
384 | secpath_reset(skb); | |
b0e380b1 | 385 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 386 | skb_reset_network_header(skb); |
8cdfab8a | 387 | IPCB(skb)->flags = 0; |
1da177e4 LT |
388 | skb->protocol = htons(ETH_P_IPV6); |
389 | skb->pkt_type = PACKET_HOST; | |
390 | tunnel->stat.rx_packets++; | |
391 | tunnel->stat.rx_bytes += skb->len; | |
392 | skb->dev = tunnel->dev; | |
393 | dst_release(skb->dst); | |
394 | skb->dst = NULL; | |
395 | nf_reset(skb); | |
396 | ipip6_ecn_decapsulate(iph, skb); | |
397 | netif_rx(skb); | |
398 | read_unlock(&ipip6_lock); | |
399 | return 0; | |
400 | } | |
401 | ||
45af08be | 402 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
403 | kfree_skb(skb); |
404 | read_unlock(&ipip6_lock); | |
405 | out: | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* Returns the embedded IPv4 address if the IPv6 address | |
410 | comes from 6to4 (RFC 3056) addr space */ | |
411 | ||
e69a4adc | 412 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 413 | { |
e69a4adc | 414 | __be32 dst = 0; |
1da177e4 LT |
415 | |
416 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 417 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
418 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
419 | } | |
420 | return dst; | |
421 | } | |
422 | ||
423 | /* | |
424 | * This function assumes it is being called from dev_queue_xmit() | |
425 | * and that skb is filled properly by that function. | |
426 | */ | |
427 | ||
428 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
429 | { | |
2941a486 | 430 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
431 | struct net_device_stats *stats = &tunnel->stat; |
432 | struct iphdr *tiph = &tunnel->parms.iph; | |
0660e03f | 433 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
434 | u8 tos = tunnel->parms.iph.tos; |
435 | struct rtable *rt; /* Route to the other host */ | |
436 | struct net_device *tdev; /* Device to other host */ | |
437 | struct iphdr *iph; /* Our new IP header */ | |
438 | int max_headroom; /* The extra header space needed */ | |
e69a4adc | 439 | __be32 dst = tiph->daddr; |
1da177e4 | 440 | int mtu; |
1ab1457c | 441 | struct in6_addr *addr6; |
1da177e4 LT |
442 | int addr_type; |
443 | ||
444 | if (tunnel->recursion++) { | |
445 | tunnel->stat.collisions++; | |
446 | goto tx_error; | |
447 | } | |
448 | ||
449 | if (skb->protocol != htons(ETH_P_IPV6)) | |
450 | goto tx_error; | |
451 | ||
452 | if (!dst) | |
453 | dst = try_6to4(&iph6->daddr); | |
454 | ||
455 | if (!dst) { | |
456 | struct neighbour *neigh = NULL; | |
457 | ||
458 | if (skb->dst) | |
459 | neigh = skb->dst->neighbour; | |
460 | ||
461 | if (neigh == NULL) { | |
462 | if (net_ratelimit()) | |
463 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
464 | goto tx_error; | |
465 | } | |
466 | ||
467 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
468 | addr_type = ipv6_addr_type(addr6); | |
469 | ||
470 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 471 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
472 | addr_type = ipv6_addr_type(addr6); |
473 | } | |
474 | ||
475 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
476 | goto tx_error_icmp; | |
477 | ||
478 | dst = addr6->s6_addr32[3]; | |
479 | } | |
480 | ||
481 | { | |
482 | struct flowi fl = { .nl_u = { .ip4_u = | |
483 | { .daddr = dst, | |
484 | .saddr = tiph->saddr, | |
485 | .tos = RT_TOS(tos) } }, | |
486 | .oif = tunnel->parms.link, | |
487 | .proto = IPPROTO_IPV6 }; | |
488 | if (ip_route_output_key(&rt, &fl)) { | |
489 | tunnel->stat.tx_carrier_errors++; | |
490 | goto tx_error_icmp; | |
491 | } | |
492 | } | |
493 | if (rt->rt_type != RTN_UNICAST) { | |
494 | ip_rt_put(rt); | |
495 | tunnel->stat.tx_carrier_errors++; | |
496 | goto tx_error_icmp; | |
497 | } | |
498 | tdev = rt->u.dst.dev; | |
499 | ||
500 | if (tdev == dev) { | |
501 | ip_rt_put(rt); | |
502 | tunnel->stat.collisions++; | |
503 | goto tx_error; | |
504 | } | |
505 | ||
506 | if (tiph->frag_off) | |
507 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
508 | else | |
509 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
510 | ||
511 | if (mtu < 68) { | |
512 | tunnel->stat.collisions++; | |
513 | ip_rt_put(rt); | |
514 | goto tx_error; | |
515 | } | |
516 | if (mtu < IPV6_MIN_MTU) | |
517 | mtu = IPV6_MIN_MTU; | |
518 | if (tunnel->parms.iph.daddr && skb->dst) | |
519 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
520 | ||
521 | if (skb->len > mtu) { | |
522 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
523 | ip_rt_put(rt); | |
524 | goto tx_error; | |
525 | } | |
526 | ||
527 | if (tunnel->err_count > 0) { | |
528 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
529 | tunnel->err_count--; | |
530 | dst_link_failure(skb); | |
531 | } else | |
532 | tunnel->err_count = 0; | |
533 | } | |
534 | ||
535 | /* | |
536 | * Okay, now see if we can stuff it in the buffer as-is. | |
537 | */ | |
538 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
539 | ||
540 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { | |
541 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
542 | if (!new_skb) { | |
543 | ip_rt_put(rt); | |
1ab1457c | 544 | stats->tx_dropped++; |
1da177e4 LT |
545 | dev_kfree_skb(skb); |
546 | tunnel->recursion--; | |
547 | return 0; | |
548 | } | |
549 | if (skb->sk) | |
550 | skb_set_owner_w(new_skb, skb->sk); | |
551 | dev_kfree_skb(skb); | |
552 | skb = new_skb; | |
0660e03f | 553 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
554 | } |
555 | ||
b0e380b1 | 556 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
557 | skb_push(skb, sizeof(struct iphdr)); |
558 | skb_reset_network_header(skb); | |
1da177e4 | 559 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 560 | IPCB(skb)->flags = 0; |
1da177e4 LT |
561 | dst_release(skb->dst); |
562 | skb->dst = &rt->u.dst; | |
563 | ||
564 | /* | |
565 | * Push down and install the IPIP header. | |
566 | */ | |
567 | ||
eddc9ec5 | 568 | iph = ip_hdr(skb); |
1da177e4 LT |
569 | iph->version = 4; |
570 | iph->ihl = sizeof(struct iphdr)>>2; | |
571 | if (mtu > IPV6_MIN_MTU) | |
572 | iph->frag_off = htons(IP_DF); | |
573 | else | |
574 | iph->frag_off = 0; | |
575 | ||
576 | iph->protocol = IPPROTO_IPV6; | |
577 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
578 | iph->daddr = rt->rt_dst; | |
579 | iph->saddr = rt->rt_src; | |
580 | ||
581 | if ((iph->ttl = tiph->ttl) == 0) | |
582 | iph->ttl = iph6->hop_limit; | |
583 | ||
584 | nf_reset(skb); | |
585 | ||
586 | IPTUNNEL_XMIT(); | |
587 | tunnel->recursion--; | |
588 | return 0; | |
589 | ||
590 | tx_error_icmp: | |
591 | dst_link_failure(skb); | |
592 | tx_error: | |
593 | stats->tx_errors++; | |
594 | dev_kfree_skb(skb); | |
595 | tunnel->recursion--; | |
596 | return 0; | |
597 | } | |
598 | ||
599 | static int | |
600 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
601 | { | |
602 | int err = 0; | |
603 | struct ip_tunnel_parm p; | |
604 | struct ip_tunnel *t; | |
605 | ||
606 | switch (cmd) { | |
607 | case SIOCGETTUNNEL: | |
608 | t = NULL; | |
609 | if (dev == ipip6_fb_tunnel_dev) { | |
610 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
611 | err = -EFAULT; | |
612 | break; | |
613 | } | |
614 | t = ipip6_tunnel_locate(&p, 0); | |
615 | } | |
616 | if (t == NULL) | |
2941a486 | 617 | t = netdev_priv(dev); |
1da177e4 LT |
618 | memcpy(&p, &t->parms, sizeof(p)); |
619 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
620 | err = -EFAULT; | |
621 | break; | |
622 | ||
623 | case SIOCADDTUNNEL: | |
624 | case SIOCCHGTUNNEL: | |
625 | err = -EPERM; | |
626 | if (!capable(CAP_NET_ADMIN)) | |
627 | goto done; | |
628 | ||
629 | err = -EFAULT; | |
630 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
631 | goto done; | |
632 | ||
633 | err = -EINVAL; | |
634 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
635 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
636 | goto done; | |
637 | if (p.iph.ttl) | |
638 | p.iph.frag_off |= htons(IP_DF); | |
639 | ||
640 | t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL); | |
641 | ||
642 | if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
643 | if (t != NULL) { | |
644 | if (t->dev != dev) { | |
645 | err = -EEXIST; | |
646 | break; | |
647 | } | |
648 | } else { | |
649 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
650 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
651 | err = -EINVAL; | |
652 | break; | |
653 | } | |
2941a486 | 654 | t = netdev_priv(dev); |
1da177e4 LT |
655 | ipip6_tunnel_unlink(t); |
656 | t->parms.iph.saddr = p.iph.saddr; | |
657 | t->parms.iph.daddr = p.iph.daddr; | |
658 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
659 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
660 | ipip6_tunnel_link(t); | |
661 | netdev_state_change(dev); | |
662 | } | |
663 | } | |
664 | ||
665 | if (t) { | |
666 | err = 0; | |
667 | if (cmd == SIOCCHGTUNNEL) { | |
668 | t->parms.iph.ttl = p.iph.ttl; | |
669 | t->parms.iph.tos = p.iph.tos; | |
670 | } | |
671 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
672 | err = -EFAULT; | |
673 | } else | |
674 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
675 | break; | |
676 | ||
677 | case SIOCDELTUNNEL: | |
678 | err = -EPERM; | |
679 | if (!capable(CAP_NET_ADMIN)) | |
680 | goto done; | |
681 | ||
682 | if (dev == ipip6_fb_tunnel_dev) { | |
683 | err = -EFAULT; | |
684 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
685 | goto done; | |
686 | err = -ENOENT; | |
687 | if ((t = ipip6_tunnel_locate(&p, 0)) == NULL) | |
688 | goto done; | |
689 | err = -EPERM; | |
2941a486 | 690 | if (t == netdev_priv(ipip6_fb_tunnel_dev)) |
1da177e4 LT |
691 | goto done; |
692 | dev = t->dev; | |
693 | } | |
22f8cde5 SH |
694 | unregister_netdevice(dev); |
695 | err = 0; | |
1da177e4 LT |
696 | break; |
697 | ||
698 | default: | |
699 | err = -EINVAL; | |
700 | } | |
701 | ||
702 | done: | |
703 | return err; | |
704 | } | |
705 | ||
706 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
707 | { | |
2941a486 | 708 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); |
1da177e4 LT |
709 | } |
710 | ||
711 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
712 | { | |
713 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
714 | return -EINVAL; | |
715 | dev->mtu = new_mtu; | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static void ipip6_tunnel_setup(struct net_device *dev) | |
720 | { | |
721 | SET_MODULE_OWNER(dev); | |
722 | dev->uninit = ipip6_tunnel_uninit; | |
723 | dev->destructor = free_netdev; | |
724 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
725 | dev->get_stats = ipip6_tunnel_get_stats; | |
726 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
727 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
728 | ||
729 | dev->type = ARPHRD_SIT; | |
730 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 731 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
732 | dev->flags = IFF_NOARP; |
733 | dev->iflink = 0; | |
734 | dev->addr_len = 4; | |
735 | } | |
736 | ||
737 | static int ipip6_tunnel_init(struct net_device *dev) | |
738 | { | |
739 | struct net_device *tdev = NULL; | |
740 | struct ip_tunnel *tunnel; | |
741 | struct iphdr *iph; | |
742 | ||
2941a486 | 743 | tunnel = netdev_priv(dev); |
1da177e4 LT |
744 | iph = &tunnel->parms.iph; |
745 | ||
746 | tunnel->dev = dev; | |
747 | strcpy(tunnel->parms.name, dev->name); | |
748 | ||
749 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
750 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
751 | ||
752 | if (iph->daddr) { | |
753 | struct flowi fl = { .nl_u = { .ip4_u = | |
754 | { .daddr = iph->daddr, | |
755 | .saddr = iph->saddr, | |
756 | .tos = RT_TOS(iph->tos) } }, | |
757 | .oif = tunnel->parms.link, | |
758 | .proto = IPPROTO_IPV6 }; | |
759 | struct rtable *rt; | |
760 | if (!ip_route_output_key(&rt, &fl)) { | |
761 | tdev = rt->u.dst.dev; | |
762 | ip_rt_put(rt); | |
763 | } | |
764 | dev->flags |= IFF_POINTOPOINT; | |
765 | } | |
766 | ||
767 | if (!tdev && tunnel->parms.link) | |
768 | tdev = __dev_get_by_index(tunnel->parms.link); | |
769 | ||
770 | if (tdev) { | |
771 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
772 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
773 | if (dev->mtu < IPV6_MIN_MTU) | |
774 | dev->mtu = IPV6_MIN_MTU; | |
775 | } | |
776 | dev->iflink = tunnel->parms.link; | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
20380731 | 781 | static int __init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 782 | { |
2941a486 | 783 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
784 | struct iphdr *iph = &tunnel->parms.iph; |
785 | ||
786 | tunnel->dev = dev; | |
787 | strcpy(tunnel->parms.name, dev->name); | |
788 | ||
789 | iph->version = 4; | |
790 | iph->protocol = IPPROTO_IPV6; | |
791 | iph->ihl = 5; | |
792 | iph->ttl = 64; | |
793 | ||
794 | dev_hold(dev); | |
795 | tunnels_wc[0] = tunnel; | |
796 | return 0; | |
797 | } | |
798 | ||
c73cb5a2 | 799 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
800 | .handler = ipip6_rcv, |
801 | .err_handler = ipip6_err, | |
c73cb5a2 | 802 | .priority = 1, |
1da177e4 LT |
803 | }; |
804 | ||
db44575f AK |
805 | static void __exit sit_destroy_tunnels(void) |
806 | { | |
807 | int prio; | |
808 | ||
809 | for (prio = 1; prio < 4; prio++) { | |
810 | int h; | |
811 | for (h = 0; h < HASH_SIZE; h++) { | |
812 | struct ip_tunnel *t; | |
813 | while ((t = tunnels[prio][h]) != NULL) | |
814 | unregister_netdevice(t->dev); | |
815 | } | |
816 | } | |
817 | } | |
818 | ||
89c89458 | 819 | static void __exit sit_cleanup(void) |
1da177e4 | 820 | { |
c73cb5a2 | 821 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f AK |
822 | |
823 | rtnl_lock(); | |
824 | sit_destroy_tunnels(); | |
825 | unregister_netdevice(ipip6_fb_tunnel_dev); | |
826 | rtnl_unlock(); | |
1da177e4 LT |
827 | } |
828 | ||
89c89458 | 829 | static int __init sit_init(void) |
1da177e4 LT |
830 | { |
831 | int err; | |
832 | ||
833 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
834 | ||
c73cb5a2 | 835 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
836 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
837 | return -EAGAIN; | |
838 | } | |
839 | ||
1ab1457c | 840 | ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1da177e4 LT |
841 | ipip6_tunnel_setup); |
842 | if (!ipip6_fb_tunnel_dev) { | |
843 | err = -ENOMEM; | |
844 | goto err1; | |
845 | } | |
846 | ||
847 | ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
848 | ||
849 | if ((err = register_netdev(ipip6_fb_tunnel_dev))) | |
850 | goto err2; | |
851 | ||
852 | out: | |
853 | return err; | |
854 | err2: | |
855 | free_netdev(ipip6_fb_tunnel_dev); | |
856 | err1: | |
c73cb5a2 | 857 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1da177e4 LT |
858 | goto out; |
859 | } | |
989e5b96 JR |
860 | |
861 | module_init(sit_init); | |
862 | module_exit(sit_cleanup); | |
39c85086 | 863 | MODULE_LICENSE("GPL"); |
daccff02 | 864 | MODULE_ALIAS("sit0"); |