Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
e905a9ed | 2 | * Linux NET3: IP/IP protocol decoder. |
1da177e4 | 3 | * |
1da177e4 LT |
4 | * Authors: |
5 | * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
6 | * | |
7 | * Fixes: | |
8 | * Alan Cox : Merged and made usable non modular (its so tiny its silly as | |
9 | * a module taking up 2 pages). | |
10 | * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) | |
11 | * to keep ip_forward happy. | |
12 | * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). | |
13 | * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL | |
14 | * David Woodhouse : Perform some basic ICMP handling. | |
15 | * IPIP Routing without decapsulation. | |
16 | * Carlos Picoto : GRE over IP support | |
17 | * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. | |
18 | * I do not want to merge them together. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | * | |
25 | */ | |
26 | ||
27 | /* tunnel.c: an IP tunnel driver | |
28 | ||
29 | The purpose of this driver is to provide an IP tunnel through | |
30 | which you can tunnel network traffic transparently across subnets. | |
31 | ||
32 | This was written by looking at Nick Holloway's dummy driver | |
33 | Thanks for the great code! | |
34 | ||
35 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
e905a9ed | 36 | |
1da177e4 LT |
37 | Minor tweaks: |
38 | Cleaned up the code a little and added some pre-1.3.0 tweaks. | |
39 | dev->hard_header/hard_header_len changed to use no headers. | |
40 | Comments/bracketing tweaked. | |
41 | Made the tunnels use dev->name not tunnel: when error reporting. | |
42 | Added tx_dropped stat | |
e905a9ed | 43 | |
113aa838 | 44 | -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 |
1da177e4 LT |
45 | |
46 | Reworked: | |
47 | Changed to tunnel to destination gateway in addition to the | |
48 | tunnel's pointopoint address | |
49 | Almost completely rewritten | |
50 | Note: There is currently no firewall or ICMP handling done. | |
51 | ||
52 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 | |
e905a9ed | 53 | |
1da177e4 LT |
54 | */ |
55 | ||
56 | /* Things I wish I had known when writing the tunnel driver: | |
57 | ||
58 | When the tunnel_xmit() function is called, the skb contains the | |
59 | packet to be sent (plus a great deal of extra info), and dev | |
60 | contains the tunnel device that _we_ are. | |
61 | ||
62 | When we are passed a packet, we are expected to fill in the | |
63 | source address with our source IP address. | |
64 | ||
65 | What is the proper way to allocate, copy and free a buffer? | |
66 | After you allocate it, it is a "0 length" chunk of memory | |
67 | starting at zero. If you want to add headers to the buffer | |
68 | later, you'll have to call "skb_reserve(skb, amount)" with | |
69 | the amount of memory you want reserved. Then, you call | |
70 | "skb_put(skb, amount)" with the amount of space you want in | |
71 | the buffer. skb_put() returns a pointer to the top (#0) of | |
72 | that buffer. skb->len is set to the amount of space you have | |
73 | "allocated" with skb_put(). You can then write up to skb->len | |
74 | bytes to that buffer. If you need more, you can call skb_put() | |
75 | again with the additional amount of space you need. You can | |
e905a9ed | 76 | find out how much more space you can allocate by calling |
1da177e4 LT |
77 | "skb_tailroom(skb)". |
78 | Now, to add header space, call "skb_push(skb, header_len)". | |
79 | This creates space at the beginning of the buffer and returns | |
80 | a pointer to this new space. If later you need to strip a | |
81 | header from a buffer, call "skb_pull(skb, header_len)". | |
82 | skb_headroom() will return how much space is left at the top | |
83 | of the buffer (before the main data). Remember, this headroom | |
84 | space must be reserved before the skb_put() function is called. | |
85 | */ | |
86 | ||
87 | /* | |
88 | This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c | |
89 | ||
90 | For comments look at net/ipv4/ip_gre.c --ANK | |
91 | */ | |
92 | ||
e905a9ed | 93 | |
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 LT |
95 | #include <linux/module.h> |
96 | #include <linux/types.h> | |
1da177e4 LT |
97 | #include <linux/kernel.h> |
98 | #include <asm/uaccess.h> | |
99 | #include <linux/skbuff.h> | |
100 | #include <linux/netdevice.h> | |
101 | #include <linux/in.h> | |
102 | #include <linux/tcp.h> | |
103 | #include <linux/udp.h> | |
104 | #include <linux/if_arp.h> | |
105 | #include <linux/mroute.h> | |
106 | #include <linux/init.h> | |
107 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 108 | #include <linux/if_ether.h> |
1da177e4 LT |
109 | |
110 | #include <net/sock.h> | |
111 | #include <net/ip.h> | |
112 | #include <net/icmp.h> | |
1da177e4 LT |
113 | #include <net/ipip.h> |
114 | #include <net/inet_ecn.h> | |
115 | #include <net/xfrm.h> | |
10dc4c7b PE |
116 | #include <net/net_namespace.h> |
117 | #include <net/netns/generic.h> | |
1da177e4 LT |
118 | |
119 | #define HASH_SIZE 16 | |
d5a0a1e3 | 120 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 121 | |
10dc4c7b PE |
122 | static int ipip_net_id; |
123 | struct ipip_net { | |
44d3c299 PE |
124 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
125 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
126 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
127 | struct ip_tunnel *tunnels_wc[1]; | |
128 | struct ip_tunnel **tunnels[4]; | |
129 | ||
b9855c54 | 130 | struct net_device *fb_tunnel_dev; |
10dc4c7b PE |
131 | }; |
132 | ||
23a12b14 SH |
133 | static void ipip_fb_tunnel_init(struct net_device *dev); |
134 | static void ipip_tunnel_init(struct net_device *dev); | |
1da177e4 LT |
135 | static void ipip_tunnel_setup(struct net_device *dev); |
136 | ||
1da177e4 LT |
137 | static DEFINE_RWLOCK(ipip_lock); |
138 | ||
b9fae5c9 PE |
139 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, |
140 | __be32 remote, __be32 local) | |
1da177e4 LT |
141 | { |
142 | unsigned h0 = HASH(remote); | |
143 | unsigned h1 = HASH(local); | |
144 | struct ip_tunnel *t; | |
44d3c299 | 145 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 146 | |
44d3c299 | 147 | for (t = ipn->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 LT |
148 | if (local == t->parms.iph.saddr && |
149 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
150 | return t; | |
151 | } | |
44d3c299 | 152 | for (t = ipn->tunnels_r[h0]; t; t = t->next) { |
1da177e4 LT |
153 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
154 | return t; | |
155 | } | |
44d3c299 | 156 | for (t = ipn->tunnels_l[h1]; t; t = t->next) { |
1da177e4 LT |
157 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
158 | return t; | |
159 | } | |
44d3c299 | 160 | if ((t = ipn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) |
1da177e4 LT |
161 | return t; |
162 | return NULL; | |
163 | } | |
164 | ||
b9fae5c9 PE |
165 | static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn, |
166 | struct ip_tunnel_parm *parms) | |
1da177e4 | 167 | { |
87d1a164 YH |
168 | __be32 remote = parms->iph.daddr; |
169 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
170 | unsigned h = 0; |
171 | int prio = 0; | |
172 | ||
173 | if (remote) { | |
174 | prio |= 2; | |
175 | h ^= HASH(remote); | |
176 | } | |
177 | if (local) { | |
178 | prio |= 1; | |
179 | h ^= HASH(local); | |
180 | } | |
44d3c299 | 181 | return &ipn->tunnels[prio][h]; |
1da177e4 LT |
182 | } |
183 | ||
b9fae5c9 PE |
184 | static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn, |
185 | struct ip_tunnel *t) | |
87d1a164 | 186 | { |
b9fae5c9 | 187 | return __ipip_bucket(ipn, &t->parms); |
87d1a164 | 188 | } |
1da177e4 | 189 | |
b9fae5c9 | 190 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 LT |
191 | { |
192 | struct ip_tunnel **tp; | |
193 | ||
b9fae5c9 | 194 | for (tp = ipip_bucket(ipn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
195 | if (t == *tp) { |
196 | write_lock_bh(&ipip_lock); | |
197 | *tp = t->next; | |
198 | write_unlock_bh(&ipip_lock); | |
199 | break; | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
b9fae5c9 | 204 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 205 | { |
b9fae5c9 | 206 | struct ip_tunnel **tp = ipip_bucket(ipn, t); |
1da177e4 LT |
207 | |
208 | t->next = *tp; | |
209 | write_lock_bh(&ipip_lock); | |
210 | *tp = t; | |
211 | write_unlock_bh(&ipip_lock); | |
212 | } | |
213 | ||
b9fae5c9 PE |
214 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, |
215 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 216 | { |
d5a0a1e3 AV |
217 | __be32 remote = parms->iph.daddr; |
218 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
219 | struct ip_tunnel *t, **tp, *nt; |
220 | struct net_device *dev; | |
1da177e4 | 221 | char name[IFNAMSIZ]; |
b9fae5c9 | 222 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 223 | |
b9fae5c9 | 224 | for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
225 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
226 | return t; | |
227 | } | |
228 | if (!create) | |
229 | return NULL; | |
230 | ||
231 | if (parms->name[0]) | |
232 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
233 | else |
234 | sprintf(name, "tunl%%d"); | |
1da177e4 LT |
235 | |
236 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
237 | if (dev == NULL) | |
238 | return NULL; | |
239 | ||
0a826406 PE |
240 | dev_net_set(dev, net); |
241 | ||
b37d428b PE |
242 | if (strchr(name, '%')) { |
243 | if (dev_alloc_name(dev, name) < 0) | |
244 | goto failed_free; | |
245 | } | |
246 | ||
2941a486 | 247 | nt = netdev_priv(dev); |
1da177e4 LT |
248 | nt->parms = *parms; |
249 | ||
23a12b14 SH |
250 | ipip_tunnel_init(dev); |
251 | ||
b37d428b PE |
252 | if (register_netdevice(dev) < 0) |
253 | goto failed_free; | |
1da177e4 LT |
254 | |
255 | dev_hold(dev); | |
b9fae5c9 | 256 | ipip_tunnel_link(ipn, nt); |
1da177e4 LT |
257 | return nt; |
258 | ||
b37d428b PE |
259 | failed_free: |
260 | free_netdev(dev); | |
1da177e4 LT |
261 | return NULL; |
262 | } | |
263 | ||
264 | static void ipip_tunnel_uninit(struct net_device *dev) | |
265 | { | |
b9855c54 PE |
266 | struct net *net = dev_net(dev); |
267 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
268 | ||
269 | if (dev == ipn->fb_tunnel_dev) { | |
1da177e4 | 270 | write_lock_bh(&ipip_lock); |
44d3c299 | 271 | ipn->tunnels_wc[0] = NULL; |
1da177e4 LT |
272 | write_unlock_bh(&ipip_lock); |
273 | } else | |
b9fae5c9 | 274 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
1da177e4 LT |
275 | dev_put(dev); |
276 | } | |
277 | ||
d2acc347 | 278 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 279 | { |
1da177e4 | 280 | |
071f92d0 | 281 | /* All the routers (except for Linux) return only |
1da177e4 LT |
282 | 8 bytes of packet payload. It means, that precise relaying of |
283 | ICMP in the real Internet is absolutely infeasible. | |
284 | */ | |
5a5f3a8d | 285 | struct iphdr *iph = (struct iphdr *)skb->data; |
88c7664f ACM |
286 | const int type = icmp_hdr(skb)->type; |
287 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 288 | struct ip_tunnel *t; |
d2acc347 | 289 | int err; |
1da177e4 LT |
290 | |
291 | switch (type) { | |
292 | default: | |
293 | case ICMP_PARAMETERPROB: | |
d2acc347 | 294 | return 0; |
1da177e4 LT |
295 | |
296 | case ICMP_DEST_UNREACH: | |
297 | switch (code) { | |
298 | case ICMP_SR_FAILED: | |
299 | case ICMP_PORT_UNREACH: | |
300 | /* Impossible event. */ | |
d2acc347 | 301 | return 0; |
1da177e4 LT |
302 | case ICMP_FRAG_NEEDED: |
303 | /* Soft state for pmtu is maintained by IP core. */ | |
d2acc347 | 304 | return 0; |
1da177e4 LT |
305 | default: |
306 | /* All others are translated to HOST_UNREACH. | |
307 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
308 | I believe they are just ether pollution. --ANK | |
309 | */ | |
310 | break; | |
311 | } | |
312 | break; | |
313 | case ICMP_TIME_EXCEEDED: | |
314 | if (code != ICMP_EXC_TTL) | |
d2acc347 | 315 | return 0; |
1da177e4 LT |
316 | break; |
317 | } | |
318 | ||
d2acc347 HX |
319 | err = -ENOENT; |
320 | ||
1da177e4 | 321 | read_lock(&ipip_lock); |
cec3ffae | 322 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
323 | if (t == NULL || t->parms.iph.daddr == 0) |
324 | goto out; | |
d2acc347 HX |
325 | |
326 | err = 0; | |
1da177e4 LT |
327 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
328 | goto out; | |
329 | ||
26d94b46 | 330 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
331 | t->err_count++; |
332 | else | |
333 | t->err_count = 1; | |
334 | t->err_time = jiffies; | |
335 | out: | |
336 | read_unlock(&ipip_lock); | |
d2acc347 | 337 | return err; |
1da177e4 LT |
338 | } |
339 | ||
eddc9ec5 ACM |
340 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
341 | struct sk_buff *skb) | |
1da177e4 | 342 | { |
eddc9ec5 | 343 | struct iphdr *inner_iph = ip_hdr(skb); |
1da177e4 LT |
344 | |
345 | if (INET_ECN_is_ce(outer_iph->tos)) | |
346 | IP_ECN_set_ce(inner_iph); | |
347 | } | |
348 | ||
349 | static int ipip_rcv(struct sk_buff *skb) | |
350 | { | |
1da177e4 | 351 | struct ip_tunnel *tunnel; |
eddc9ec5 | 352 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
353 | |
354 | read_lock(&ipip_lock); | |
cec3ffae | 355 | if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev), |
b9fae5c9 | 356 | iph->saddr, iph->daddr)) != NULL) { |
1da177e4 LT |
357 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
358 | read_unlock(&ipip_lock); | |
359 | kfree_skb(skb); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | secpath_reset(skb); | |
364 | ||
b0e380b1 | 365 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 366 | skb_reset_network_header(skb); |
1da177e4 LT |
367 | skb->protocol = htons(ETH_P_IP); |
368 | skb->pkt_type = PACKET_HOST; | |
369 | ||
50f59cea PE |
370 | tunnel->dev->stats.rx_packets++; |
371 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
372 | skb->dev = tunnel->dev; |
373 | dst_release(skb->dst); | |
374 | skb->dst = NULL; | |
375 | nf_reset(skb); | |
376 | ipip_ecn_decapsulate(iph, skb); | |
377 | netif_rx(skb); | |
378 | read_unlock(&ipip_lock); | |
379 | return 0; | |
380 | } | |
381 | read_unlock(&ipip_lock); | |
382 | ||
1da177e4 LT |
383 | return -1; |
384 | } | |
385 | ||
386 | /* | |
387 | * This function assumes it is being called from dev_queue_xmit() | |
388 | * and that skb is filled properly by that function. | |
389 | */ | |
390 | ||
391 | static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
392 | { | |
2941a486 | 393 | struct ip_tunnel *tunnel = netdev_priv(dev); |
50f59cea | 394 | struct net_device_stats *stats = &tunnel->dev->stats; |
1da177e4 LT |
395 | struct iphdr *tiph = &tunnel->parms.iph; |
396 | u8 tos = tunnel->parms.iph.tos; | |
d5a0a1e3 | 397 | __be16 df = tiph->frag_off; |
1da177e4 LT |
398 | struct rtable *rt; /* Route to the other host */ |
399 | struct net_device *tdev; /* Device to other host */ | |
eddc9ec5 | 400 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 401 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 402 | unsigned int max_headroom; /* The extra header space needed */ |
d5a0a1e3 | 403 | __be32 dst = tiph->daddr; |
1da177e4 LT |
404 | int mtu; |
405 | ||
406 | if (tunnel->recursion++) { | |
50f59cea | 407 | stats->collisions++; |
1da177e4 LT |
408 | goto tx_error; |
409 | } | |
410 | ||
411 | if (skb->protocol != htons(ETH_P_IP)) | |
412 | goto tx_error; | |
413 | ||
414 | if (tos&1) | |
415 | tos = old_iph->tos; | |
416 | ||
417 | if (!dst) { | |
418 | /* NBMA tunnel */ | |
ee6b9673 | 419 | if ((rt = skb->rtable) == NULL) { |
50f59cea | 420 | stats->tx_fifo_errors++; |
1da177e4 LT |
421 | goto tx_error; |
422 | } | |
423 | if ((dst = rt->rt_gateway) == 0) | |
424 | goto tx_error_icmp; | |
425 | } | |
426 | ||
427 | { | |
428 | struct flowi fl = { .oif = tunnel->parms.link, | |
429 | .nl_u = { .ip4_u = | |
430 | { .daddr = dst, | |
431 | .saddr = tiph->saddr, | |
432 | .tos = RT_TOS(tos) } }, | |
433 | .proto = IPPROTO_IPIP }; | |
b99f0152 | 434 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
50f59cea | 435 | stats->tx_carrier_errors++; |
1da177e4 LT |
436 | goto tx_error_icmp; |
437 | } | |
438 | } | |
439 | tdev = rt->u.dst.dev; | |
440 | ||
441 | if (tdev == dev) { | |
442 | ip_rt_put(rt); | |
50f59cea | 443 | stats->collisions++; |
1da177e4 LT |
444 | goto tx_error; |
445 | } | |
446 | ||
447 | if (tiph->frag_off) | |
448 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
449 | else | |
450 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
451 | ||
452 | if (mtu < 68) { | |
50f59cea | 453 | stats->collisions++; |
1da177e4 LT |
454 | ip_rt_put(rt); |
455 | goto tx_error; | |
456 | } | |
457 | if (skb->dst) | |
458 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
459 | ||
460 | df |= (old_iph->frag_off&htons(IP_DF)); | |
461 | ||
462 | if ((old_iph->frag_off&htons(IP_DF)) && mtu < ntohs(old_iph->tot_len)) { | |
463 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
464 | ip_rt_put(rt); | |
465 | goto tx_error; | |
466 | } | |
467 | ||
468 | if (tunnel->err_count > 0) { | |
26d94b46 WY |
469 | if (time_before(jiffies, |
470 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
471 | tunnel->err_count--; |
472 | dst_link_failure(skb); | |
473 | } else | |
474 | tunnel->err_count = 0; | |
475 | } | |
476 | ||
477 | /* | |
478 | * Okay, now see if we can stuff it in the buffer as-is. | |
479 | */ | |
480 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
481 | ||
cfbba49d PM |
482 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
483 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
484 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
485 | if (!new_skb) { | |
486 | ip_rt_put(rt); | |
e905a9ed | 487 | stats->tx_dropped++; |
1da177e4 LT |
488 | dev_kfree_skb(skb); |
489 | tunnel->recursion--; | |
490 | return 0; | |
491 | } | |
492 | if (skb->sk) | |
493 | skb_set_owner_w(new_skb, skb->sk); | |
494 | dev_kfree_skb(skb); | |
495 | skb = new_skb; | |
eddc9ec5 | 496 | old_iph = ip_hdr(skb); |
1da177e4 LT |
497 | } |
498 | ||
b0e380b1 | 499 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
500 | skb_push(skb, sizeof(struct iphdr)); |
501 | skb_reset_network_header(skb); | |
1da177e4 | 502 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
503 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
504 | IPSKB_REROUTED); | |
1da177e4 LT |
505 | dst_release(skb->dst); |
506 | skb->dst = &rt->u.dst; | |
507 | ||
508 | /* | |
509 | * Push down and install the IPIP header. | |
510 | */ | |
511 | ||
eddc9ec5 | 512 | iph = ip_hdr(skb); |
1da177e4 LT |
513 | iph->version = 4; |
514 | iph->ihl = sizeof(struct iphdr)>>2; | |
515 | iph->frag_off = df; | |
516 | iph->protocol = IPPROTO_IPIP; | |
517 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
518 | iph->daddr = rt->rt_dst; | |
519 | iph->saddr = rt->rt_src; | |
520 | ||
521 | if ((iph->ttl = tiph->ttl) == 0) | |
522 | iph->ttl = old_iph->ttl; | |
523 | ||
524 | nf_reset(skb); | |
525 | ||
526 | IPTUNNEL_XMIT(); | |
527 | tunnel->recursion--; | |
528 | return 0; | |
529 | ||
530 | tx_error_icmp: | |
531 | dst_link_failure(skb); | |
532 | tx_error: | |
533 | stats->tx_errors++; | |
534 | dev_kfree_skb(skb); | |
535 | tunnel->recursion--; | |
536 | return 0; | |
537 | } | |
538 | ||
5533995b MS |
539 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
540 | { | |
541 | struct net_device *tdev = NULL; | |
542 | struct ip_tunnel *tunnel; | |
543 | struct iphdr *iph; | |
544 | ||
545 | tunnel = netdev_priv(dev); | |
546 | iph = &tunnel->parms.iph; | |
547 | ||
548 | if (iph->daddr) { | |
549 | struct flowi fl = { .oif = tunnel->parms.link, | |
550 | .nl_u = { .ip4_u = | |
551 | { .daddr = iph->daddr, | |
552 | .saddr = iph->saddr, | |
553 | .tos = RT_TOS(iph->tos) } }, | |
554 | .proto = IPPROTO_IPIP }; | |
555 | struct rtable *rt; | |
b99f0152 | 556 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
5533995b MS |
557 | tdev = rt->u.dst.dev; |
558 | ip_rt_put(rt); | |
559 | } | |
560 | dev->flags |= IFF_POINTOPOINT; | |
561 | } | |
562 | ||
563 | if (!tdev && tunnel->parms.link) | |
b99f0152 | 564 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
5533995b MS |
565 | |
566 | if (tdev) { | |
567 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
568 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
569 | } | |
570 | dev->iflink = tunnel->parms.link; | |
571 | } | |
572 | ||
1da177e4 LT |
573 | static int |
574 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
575 | { | |
576 | int err = 0; | |
577 | struct ip_tunnel_parm p; | |
578 | struct ip_tunnel *t; | |
b9855c54 PE |
579 | struct net *net = dev_net(dev); |
580 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
1da177e4 LT |
581 | |
582 | switch (cmd) { | |
583 | case SIOCGETTUNNEL: | |
584 | t = NULL; | |
b9855c54 | 585 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
586 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
587 | err = -EFAULT; | |
588 | break; | |
589 | } | |
b9fae5c9 | 590 | t = ipip_tunnel_locate(net, &p, 0); |
1da177e4 LT |
591 | } |
592 | if (t == NULL) | |
2941a486 | 593 | t = netdev_priv(dev); |
1da177e4 LT |
594 | memcpy(&p, &t->parms, sizeof(p)); |
595 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
596 | err = -EFAULT; | |
597 | break; | |
598 | ||
599 | case SIOCADDTUNNEL: | |
600 | case SIOCCHGTUNNEL: | |
601 | err = -EPERM; | |
602 | if (!capable(CAP_NET_ADMIN)) | |
603 | goto done; | |
604 | ||
605 | err = -EFAULT; | |
606 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
607 | goto done; | |
608 | ||
609 | err = -EINVAL; | |
610 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || | |
611 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
612 | goto done; | |
613 | if (p.iph.ttl) | |
614 | p.iph.frag_off |= htons(IP_DF); | |
615 | ||
b9fae5c9 | 616 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 617 | |
b9855c54 | 618 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
619 | if (t != NULL) { |
620 | if (t->dev != dev) { | |
621 | err = -EEXIST; | |
622 | break; | |
623 | } | |
624 | } else { | |
625 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
626 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
627 | err = -EINVAL; | |
628 | break; | |
629 | } | |
2941a486 | 630 | t = netdev_priv(dev); |
b9fae5c9 | 631 | ipip_tunnel_unlink(ipn, t); |
1da177e4 LT |
632 | t->parms.iph.saddr = p.iph.saddr; |
633 | t->parms.iph.daddr = p.iph.daddr; | |
634 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
635 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
b9fae5c9 | 636 | ipip_tunnel_link(ipn, t); |
1da177e4 LT |
637 | netdev_state_change(dev); |
638 | } | |
639 | } | |
640 | ||
641 | if (t) { | |
642 | err = 0; | |
643 | if (cmd == SIOCCHGTUNNEL) { | |
644 | t->parms.iph.ttl = p.iph.ttl; | |
645 | t->parms.iph.tos = p.iph.tos; | |
646 | t->parms.iph.frag_off = p.iph.frag_off; | |
5533995b MS |
647 | if (t->parms.link != p.link) { |
648 | t->parms.link = p.link; | |
649 | ipip_tunnel_bind_dev(dev); | |
650 | netdev_state_change(dev); | |
651 | } | |
1da177e4 LT |
652 | } |
653 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
654 | err = -EFAULT; | |
655 | } else | |
656 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
657 | break; | |
658 | ||
659 | case SIOCDELTUNNEL: | |
660 | err = -EPERM; | |
661 | if (!capable(CAP_NET_ADMIN)) | |
662 | goto done; | |
663 | ||
b9855c54 | 664 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
665 | err = -EFAULT; |
666 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
667 | goto done; | |
668 | err = -ENOENT; | |
b9fae5c9 | 669 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
670 | goto done; |
671 | err = -EPERM; | |
b9855c54 | 672 | if (t->dev == ipn->fb_tunnel_dev) |
1da177e4 LT |
673 | goto done; |
674 | dev = t->dev; | |
675 | } | |
22f8cde5 SH |
676 | unregister_netdevice(dev); |
677 | err = 0; | |
1da177e4 LT |
678 | break; |
679 | ||
680 | default: | |
681 | err = -EINVAL; | |
682 | } | |
683 | ||
684 | done: | |
685 | return err; | |
686 | } | |
687 | ||
1da177e4 LT |
688 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
689 | { | |
690 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
691 | return -EINVAL; | |
692 | dev->mtu = new_mtu; | |
693 | return 0; | |
694 | } | |
695 | ||
23a12b14 SH |
696 | static const struct net_device_ops ipip_netdev_ops = { |
697 | .ndo_uninit = ipip_tunnel_uninit, | |
698 | .ndo_start_xmit = ipip_tunnel_xmit, | |
699 | .ndo_do_ioctl = ipip_tunnel_ioctl, | |
700 | .ndo_change_mtu = ipip_tunnel_change_mtu, | |
701 | ||
702 | }; | |
703 | ||
1da177e4 LT |
704 | static void ipip_tunnel_setup(struct net_device *dev) |
705 | { | |
23a12b14 | 706 | dev->netdev_ops = &ipip_netdev_ops; |
1da177e4 LT |
707 | dev->destructor = free_netdev; |
708 | ||
709 | dev->type = ARPHRD_TUNNEL; | |
710 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 711 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
712 | dev->flags = IFF_NOARP; |
713 | dev->iflink = 0; | |
714 | dev->addr_len = 4; | |
0a826406 | 715 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
716 | } |
717 | ||
23a12b14 | 718 | static void ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 719 | { |
23a12b14 | 720 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
721 | |
722 | tunnel->dev = dev; | |
723 | strcpy(tunnel->parms.name, dev->name); | |
724 | ||
725 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
726 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
727 | ||
5533995b | 728 | ipip_tunnel_bind_dev(dev); |
1da177e4 LT |
729 | } |
730 | ||
23a12b14 | 731 | static void ipip_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 732 | { |
2941a486 | 733 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 734 | struct iphdr *iph = &tunnel->parms.iph; |
44d3c299 | 735 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
1da177e4 LT |
736 | |
737 | tunnel->dev = dev; | |
738 | strcpy(tunnel->parms.name, dev->name); | |
739 | ||
740 | iph->version = 4; | |
741 | iph->protocol = IPPROTO_IPIP; | |
742 | iph->ihl = 5; | |
743 | ||
744 | dev_hold(dev); | |
44d3c299 | 745 | ipn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
746 | } |
747 | ||
748 | static struct xfrm_tunnel ipip_handler = { | |
749 | .handler = ipip_rcv, | |
750 | .err_handler = ipip_err, | |
d2acc347 | 751 | .priority = 1, |
1da177e4 LT |
752 | }; |
753 | ||
5747a1aa | 754 | static const char banner[] __initconst = |
1da177e4 LT |
755 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
756 | ||
44d3c299 PE |
757 | static void ipip_destroy_tunnels(struct ipip_net *ipn) |
758 | { | |
759 | int prio; | |
760 | ||
761 | for (prio = 1; prio < 4; prio++) { | |
762 | int h; | |
763 | for (h = 0; h < HASH_SIZE; h++) { | |
764 | struct ip_tunnel *t; | |
765 | while ((t = ipn->tunnels[prio][h]) != NULL) | |
766 | unregister_netdevice(t->dev); | |
767 | } | |
768 | } | |
769 | } | |
770 | ||
10dc4c7b PE |
771 | static int ipip_init_net(struct net *net) |
772 | { | |
773 | int err; | |
774 | struct ipip_net *ipn; | |
775 | ||
776 | err = -ENOMEM; | |
44d3c299 | 777 | ipn = kzalloc(sizeof(struct ipip_net), GFP_KERNEL); |
10dc4c7b PE |
778 | if (ipn == NULL) |
779 | goto err_alloc; | |
780 | ||
781 | err = net_assign_generic(net, ipip_net_id, ipn); | |
782 | if (err < 0) | |
783 | goto err_assign; | |
784 | ||
44d3c299 PE |
785 | ipn->tunnels[0] = ipn->tunnels_wc; |
786 | ipn->tunnels[1] = ipn->tunnels_l; | |
787 | ipn->tunnels[2] = ipn->tunnels_r; | |
788 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
789 | ||
b9855c54 PE |
790 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
791 | "tunl0", | |
792 | ipip_tunnel_setup); | |
793 | if (!ipn->fb_tunnel_dev) { | |
794 | err = -ENOMEM; | |
795 | goto err_alloc_dev; | |
796 | } | |
be77e593 | 797 | dev_net_set(ipn->fb_tunnel_dev, net); |
b9855c54 | 798 | |
23a12b14 | 799 | ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
b9855c54 PE |
800 | |
801 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
802 | goto err_reg_dev; | |
803 | ||
10dc4c7b PE |
804 | return 0; |
805 | ||
b9855c54 PE |
806 | err_reg_dev: |
807 | free_netdev(ipn->fb_tunnel_dev); | |
808 | err_alloc_dev: | |
809 | /* nothing */ | |
10dc4c7b PE |
810 | err_assign: |
811 | kfree(ipn); | |
812 | err_alloc: | |
813 | return err; | |
814 | } | |
815 | ||
816 | static void ipip_exit_net(struct net *net) | |
817 | { | |
818 | struct ipip_net *ipn; | |
819 | ||
820 | ipn = net_generic(net, ipip_net_id); | |
b9855c54 | 821 | rtnl_lock(); |
44d3c299 | 822 | ipip_destroy_tunnels(ipn); |
b9855c54 PE |
823 | unregister_netdevice(ipn->fb_tunnel_dev); |
824 | rtnl_unlock(); | |
10dc4c7b PE |
825 | kfree(ipn); |
826 | } | |
827 | ||
828 | static struct pernet_operations ipip_net_ops = { | |
829 | .init = ipip_init_net, | |
830 | .exit = ipip_exit_net, | |
831 | }; | |
832 | ||
1da177e4 LT |
833 | static int __init ipip_init(void) |
834 | { | |
835 | int err; | |
836 | ||
837 | printk(banner); | |
838 | ||
c0d56408 | 839 | if (xfrm4_tunnel_register(&ipip_handler, AF_INET)) { |
1da177e4 LT |
840 | printk(KERN_INFO "ipip init: can't register tunnel\n"); |
841 | return -EAGAIN; | |
842 | } | |
843 | ||
10dc4c7b PE |
844 | err = register_pernet_gen_device(&ipip_net_id, &ipip_net_ops); |
845 | if (err) | |
b9855c54 PE |
846 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
847 | ||
1da177e4 | 848 | return err; |
1da177e4 LT |
849 | } |
850 | ||
851 | static void __exit ipip_fini(void) | |
852 | { | |
c0d56408 | 853 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
1da177e4 LT |
854 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); |
855 | ||
10dc4c7b | 856 | unregister_pernet_gen_device(ipip_net_id, &ipip_net_ops); |
1da177e4 LT |
857 | } |
858 | ||
859 | module_init(ipip_init); | |
860 | module_exit(ipip_fini); | |
861 | MODULE_LICENSE("GPL"); |