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Commit | Line | Data |
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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 | 97 | #include <linux/kernel.h> |
5a0e3ad6 | 98 | #include <linux/slab.h> |
1da177e4 LT |
99 | #include <asm/uaccess.h> |
100 | #include <linux/skbuff.h> | |
101 | #include <linux/netdevice.h> | |
102 | #include <linux/in.h> | |
103 | #include <linux/tcp.h> | |
104 | #include <linux/udp.h> | |
105 | #include <linux/if_arp.h> | |
106 | #include <linux/mroute.h> | |
107 | #include <linux/init.h> | |
108 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 109 | #include <linux/if_ether.h> |
1da177e4 LT |
110 | |
111 | #include <net/sock.h> | |
112 | #include <net/ip.h> | |
113 | #include <net/icmp.h> | |
1da177e4 LT |
114 | #include <net/ipip.h> |
115 | #include <net/inet_ecn.h> | |
116 | #include <net/xfrm.h> | |
10dc4c7b PE |
117 | #include <net/net_namespace.h> |
118 | #include <net/netns/generic.h> | |
1da177e4 LT |
119 | |
120 | #define HASH_SIZE 16 | |
d5a0a1e3 | 121 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 122 | |
f99189b1 | 123 | static int ipip_net_id __read_mostly; |
10dc4c7b | 124 | struct ipip_net { |
b7285b79 ED |
125 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; |
126 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
127 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
128 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
129 | struct ip_tunnel __rcu **tunnels[4]; | |
44d3c299 | 130 | |
b9855c54 | 131 | struct net_device *fb_tunnel_dev; |
10dc4c7b PE |
132 | }; |
133 | ||
3c97af99 | 134 | static int ipip_tunnel_init(struct net_device *dev); |
1da177e4 | 135 | static void ipip_tunnel_setup(struct net_device *dev); |
3c97af99 | 136 | static void ipip_dev_free(struct net_device *dev); |
1da177e4 | 137 | |
8f95dd63 | 138 | /* |
b7285b79 | 139 | * Locking : hash tables are protected by RCU and RTNL |
8f95dd63 | 140 | */ |
8f95dd63 ED |
141 | |
142 | #define for_each_ip_tunnel_rcu(start) \ | |
143 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 144 | |
3c97af99 ED |
145 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
146 | struct pcpu_tstats { | |
147 | unsigned long rx_packets; | |
148 | unsigned long rx_bytes; | |
149 | unsigned long tx_packets; | |
150 | unsigned long tx_bytes; | |
151 | }; | |
152 | ||
153 | static struct net_device_stats *ipip_get_stats(struct net_device *dev) | |
154 | { | |
155 | struct pcpu_tstats sum = { 0 }; | |
156 | int i; | |
157 | ||
158 | for_each_possible_cpu(i) { | |
159 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
160 | ||
161 | sum.rx_packets += tstats->rx_packets; | |
162 | sum.rx_bytes += tstats->rx_bytes; | |
163 | sum.tx_packets += tstats->tx_packets; | |
164 | sum.tx_bytes += tstats->tx_bytes; | |
165 | } | |
166 | dev->stats.rx_packets = sum.rx_packets; | |
167 | dev->stats.rx_bytes = sum.rx_bytes; | |
168 | dev->stats.tx_packets = sum.tx_packets; | |
169 | dev->stats.tx_bytes = sum.tx_bytes; | |
170 | return &dev->stats; | |
171 | } | |
172 | ||
b9fae5c9 PE |
173 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, |
174 | __be32 remote, __be32 local) | |
1da177e4 | 175 | { |
b7285b79 ED |
176 | unsigned int h0 = HASH(remote); |
177 | unsigned int h1 = HASH(local); | |
1da177e4 | 178 | struct ip_tunnel *t; |
44d3c299 | 179 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 180 | |
8f95dd63 | 181 | for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) |
1da177e4 LT |
182 | if (local == t->parms.iph.saddr && |
183 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
184 | return t; | |
8f95dd63 ED |
185 | |
186 | for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) | |
1da177e4 LT |
187 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
188 | return t; | |
8f95dd63 ED |
189 | |
190 | for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) | |
1da177e4 LT |
191 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
192 | return t; | |
8f95dd63 ED |
193 | |
194 | t = rcu_dereference(ipn->tunnels_wc[0]); | |
195 | if (t && (t->dev->flags&IFF_UP)) | |
1da177e4 LT |
196 | return t; |
197 | return NULL; | |
198 | } | |
199 | ||
b7285b79 | 200 | static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 201 | struct ip_tunnel_parm *parms) |
1da177e4 | 202 | { |
87d1a164 YH |
203 | __be32 remote = parms->iph.daddr; |
204 | __be32 local = parms->iph.saddr; | |
b7285b79 | 205 | unsigned int h = 0; |
1da177e4 LT |
206 | int prio = 0; |
207 | ||
208 | if (remote) { | |
209 | prio |= 2; | |
210 | h ^= HASH(remote); | |
211 | } | |
212 | if (local) { | |
213 | prio |= 1; | |
214 | h ^= HASH(local); | |
215 | } | |
44d3c299 | 216 | return &ipn->tunnels[prio][h]; |
1da177e4 LT |
217 | } |
218 | ||
b7285b79 | 219 | static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, |
b9fae5c9 | 220 | struct ip_tunnel *t) |
87d1a164 | 221 | { |
b9fae5c9 | 222 | return __ipip_bucket(ipn, &t->parms); |
87d1a164 | 223 | } |
1da177e4 | 224 | |
b9fae5c9 | 225 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 226 | { |
b7285b79 ED |
227 | struct ip_tunnel __rcu **tp; |
228 | struct ip_tunnel *iter; | |
229 | ||
230 | for (tp = ipip_bucket(ipn, t); | |
231 | (iter = rtnl_dereference(*tp)) != NULL; | |
232 | tp = &iter->next) { | |
233 | if (t == iter) { | |
234 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
235 | break; |
236 | } | |
237 | } | |
238 | } | |
239 | ||
b9fae5c9 | 240 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 241 | { |
b7285b79 | 242 | struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); |
1da177e4 | 243 | |
b7285b79 | 244 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
8f95dd63 | 245 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
246 | } |
247 | ||
b9fae5c9 PE |
248 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, |
249 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 250 | { |
d5a0a1e3 AV |
251 | __be32 remote = parms->iph.daddr; |
252 | __be32 local = parms->iph.saddr; | |
b7285b79 ED |
253 | struct ip_tunnel *t, *nt; |
254 | struct ip_tunnel __rcu **tp; | |
1da177e4 | 255 | struct net_device *dev; |
1da177e4 | 256 | char name[IFNAMSIZ]; |
b9fae5c9 | 257 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 258 | |
b7285b79 ED |
259 | for (tp = __ipip_bucket(ipn, parms); |
260 | (t = rtnl_dereference(*tp)) != NULL; | |
261 | tp = &t->next) { | |
1da177e4 LT |
262 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
263 | return t; | |
264 | } | |
265 | if (!create) | |
266 | return NULL; | |
267 | ||
268 | if (parms->name[0]) | |
269 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 270 | else |
3c97af99 | 271 | strcpy(name, "tunl%d"); |
1da177e4 LT |
272 | |
273 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
274 | if (dev == NULL) | |
275 | return NULL; | |
276 | ||
0a826406 PE |
277 | dev_net_set(dev, net); |
278 | ||
b37d428b PE |
279 | if (strchr(name, '%')) { |
280 | if (dev_alloc_name(dev, name) < 0) | |
281 | goto failed_free; | |
282 | } | |
283 | ||
2941a486 | 284 | nt = netdev_priv(dev); |
1da177e4 LT |
285 | nt->parms = *parms; |
286 | ||
3c97af99 ED |
287 | if (ipip_tunnel_init(dev) < 0) |
288 | goto failed_free; | |
23a12b14 | 289 | |
b37d428b PE |
290 | if (register_netdevice(dev) < 0) |
291 | goto failed_free; | |
1da177e4 LT |
292 | |
293 | dev_hold(dev); | |
b9fae5c9 | 294 | ipip_tunnel_link(ipn, nt); |
1da177e4 LT |
295 | return nt; |
296 | ||
b37d428b | 297 | failed_free: |
3c97af99 | 298 | ipip_dev_free(dev); |
1da177e4 LT |
299 | return NULL; |
300 | } | |
301 | ||
b7285b79 | 302 | /* called with RTNL */ |
1da177e4 LT |
303 | static void ipip_tunnel_uninit(struct net_device *dev) |
304 | { | |
b9855c54 PE |
305 | struct net *net = dev_net(dev); |
306 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
307 | ||
b7285b79 ED |
308 | if (dev == ipn->fb_tunnel_dev) |
309 | rcu_assign_pointer(ipn->tunnels_wc[0], NULL); | |
310 | else | |
b9fae5c9 | 311 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
1da177e4 LT |
312 | dev_put(dev); |
313 | } | |
314 | ||
d2acc347 | 315 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 316 | { |
1da177e4 | 317 | |
071f92d0 | 318 | /* All the routers (except for Linux) return only |
1da177e4 LT |
319 | 8 bytes of packet payload. It means, that precise relaying of |
320 | ICMP in the real Internet is absolutely infeasible. | |
321 | */ | |
b71d1d42 | 322 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
88c7664f ACM |
323 | const int type = icmp_hdr(skb)->type; |
324 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 325 | struct ip_tunnel *t; |
d2acc347 | 326 | int err; |
1da177e4 LT |
327 | |
328 | switch (type) { | |
329 | default: | |
330 | case ICMP_PARAMETERPROB: | |
d2acc347 | 331 | return 0; |
1da177e4 LT |
332 | |
333 | case ICMP_DEST_UNREACH: | |
334 | switch (code) { | |
335 | case ICMP_SR_FAILED: | |
336 | case ICMP_PORT_UNREACH: | |
337 | /* Impossible event. */ | |
d2acc347 | 338 | return 0; |
1da177e4 LT |
339 | case ICMP_FRAG_NEEDED: |
340 | /* Soft state for pmtu is maintained by IP core. */ | |
d2acc347 | 341 | return 0; |
1da177e4 LT |
342 | default: |
343 | /* All others are translated to HOST_UNREACH. | |
344 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
345 | I believe they are just ether pollution. --ANK | |
346 | */ | |
347 | break; | |
348 | } | |
349 | break; | |
350 | case ICMP_TIME_EXCEEDED: | |
351 | if (code != ICMP_EXC_TTL) | |
d2acc347 | 352 | return 0; |
1da177e4 LT |
353 | break; |
354 | } | |
355 | ||
d2acc347 HX |
356 | err = -ENOENT; |
357 | ||
8f95dd63 | 358 | rcu_read_lock(); |
cec3ffae | 359 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
360 | if (t == NULL || t->parms.iph.daddr == 0) |
361 | goto out; | |
d2acc347 HX |
362 | |
363 | err = 0; | |
1da177e4 LT |
364 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
365 | goto out; | |
366 | ||
26d94b46 | 367 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
368 | t->err_count++; |
369 | else | |
370 | t->err_count = 1; | |
371 | t->err_time = jiffies; | |
372 | out: | |
8f95dd63 | 373 | rcu_read_unlock(); |
d2acc347 | 374 | return err; |
1da177e4 LT |
375 | } |
376 | ||
eddc9ec5 ACM |
377 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
378 | struct sk_buff *skb) | |
1da177e4 | 379 | { |
eddc9ec5 | 380 | struct iphdr *inner_iph = ip_hdr(skb); |
1da177e4 LT |
381 | |
382 | if (INET_ECN_is_ce(outer_iph->tos)) | |
383 | IP_ECN_set_ce(inner_iph); | |
384 | } | |
385 | ||
386 | static int ipip_rcv(struct sk_buff *skb) | |
387 | { | |
1da177e4 | 388 | struct ip_tunnel *tunnel; |
eddc9ec5 | 389 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 390 | |
8f95dd63 | 391 | rcu_read_lock(); |
3c97af99 ED |
392 | tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); |
393 | if (tunnel != NULL) { | |
394 | struct pcpu_tstats *tstats; | |
395 | ||
1da177e4 | 396 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
8f95dd63 | 397 | rcu_read_unlock(); |
1da177e4 LT |
398 | kfree_skb(skb); |
399 | return 0; | |
400 | } | |
401 | ||
402 | secpath_reset(skb); | |
403 | ||
b0e380b1 | 404 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 405 | skb_reset_network_header(skb); |
1da177e4 LT |
406 | skb->protocol = htons(ETH_P_IP); |
407 | skb->pkt_type = PACKET_HOST; | |
408 | ||
3c97af99 ED |
409 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
410 | tstats->rx_packets++; | |
411 | tstats->rx_bytes += skb->len; | |
412 | ||
413 | __skb_tunnel_rx(skb, tunnel->dev); | |
d19d56dd | 414 | |
1da177e4 | 415 | ipip_ecn_decapsulate(iph, skb); |
8990f468 | 416 | |
caf586e5 | 417 | netif_rx(skb); |
8990f468 | 418 | |
8f95dd63 | 419 | rcu_read_unlock(); |
1da177e4 LT |
420 | return 0; |
421 | } | |
8f95dd63 | 422 | rcu_read_unlock(); |
1da177e4 | 423 | |
1da177e4 LT |
424 | return -1; |
425 | } | |
426 | ||
427 | /* | |
428 | * This function assumes it is being called from dev_queue_xmit() | |
429 | * and that skb is filled properly by that function. | |
430 | */ | |
431 | ||
6fef4c0c | 432 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 433 | { |
2941a486 | 434 | struct ip_tunnel *tunnel = netdev_priv(dev); |
3c97af99 | 435 | struct pcpu_tstats *tstats; |
b71d1d42 | 436 | const struct iphdr *tiph = &tunnel->parms.iph; |
1da177e4 | 437 | u8 tos = tunnel->parms.iph.tos; |
d5a0a1e3 | 438 | __be16 df = tiph->frag_off; |
1da177e4 | 439 | struct rtable *rt; /* Route to the other host */ |
3c97af99 | 440 | struct net_device *tdev; /* Device to other host */ |
b71d1d42 | 441 | const struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 442 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 443 | unsigned int max_headroom; /* The extra header space needed */ |
d5a0a1e3 | 444 | __be32 dst = tiph->daddr; |
1da177e4 LT |
445 | int mtu; |
446 | ||
1da177e4 LT |
447 | if (skb->protocol != htons(ETH_P_IP)) |
448 | goto tx_error; | |
449 | ||
3c97af99 | 450 | if (tos & 1) |
1da177e4 LT |
451 | tos = old_iph->tos; |
452 | ||
453 | if (!dst) { | |
454 | /* NBMA tunnel */ | |
511c3f92 | 455 | if ((rt = skb_rtable(skb)) == NULL) { |
3c97af99 | 456 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
457 | goto tx_error; |
458 | } | |
459 | if ((dst = rt->rt_gateway) == 0) | |
460 | goto tx_error_icmp; | |
461 | } | |
462 | ||
78fbfd8a DM |
463 | rt = ip_route_output_ports(dev_net(dev), NULL, |
464 | dst, tiph->saddr, | |
465 | 0, 0, | |
466 | IPPROTO_IPIP, RT_TOS(tos), | |
467 | tunnel->parms.link); | |
468 | if (IS_ERR(rt)) { | |
469 | dev->stats.tx_carrier_errors++; | |
470 | goto tx_error_icmp; | |
1da177e4 | 471 | } |
d8d1f30b | 472 | tdev = rt->dst.dev; |
1da177e4 LT |
473 | |
474 | if (tdev == dev) { | |
475 | ip_rt_put(rt); | |
3c97af99 | 476 | dev->stats.collisions++; |
1da177e4 LT |
477 | goto tx_error; |
478 | } | |
479 | ||
23ca0c98 HX |
480 | df |= old_iph->frag_off & htons(IP_DF); |
481 | ||
482 | if (df) { | |
d8d1f30b | 483 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 484 | |
23ca0c98 | 485 | if (mtu < 68) { |
3c97af99 | 486 | dev->stats.collisions++; |
23ca0c98 HX |
487 | ip_rt_put(rt); |
488 | goto tx_error; | |
489 | } | |
1da177e4 | 490 | |
23ca0c98 HX |
491 | if (skb_dst(skb)) |
492 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 493 | |
23ca0c98 HX |
494 | if ((old_iph->frag_off & htons(IP_DF)) && |
495 | mtu < ntohs(old_iph->tot_len)) { | |
496 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
497 | htonl(mtu)); | |
498 | ip_rt_put(rt); | |
499 | goto tx_error; | |
500 | } | |
1da177e4 LT |
501 | } |
502 | ||
503 | if (tunnel->err_count > 0) { | |
26d94b46 WY |
504 | if (time_before(jiffies, |
505 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
506 | tunnel->err_count--; |
507 | dst_link_failure(skb); | |
508 | } else | |
509 | tunnel->err_count = 0; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Okay, now see if we can stuff it in the buffer as-is. | |
514 | */ | |
515 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
516 | ||
cfbba49d PM |
517 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
518 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
519 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
520 | if (!new_skb) { | |
521 | ip_rt_put(rt); | |
3c97af99 | 522 | dev->stats.tx_dropped++; |
1da177e4 | 523 | dev_kfree_skb(skb); |
6ed10654 | 524 | return NETDEV_TX_OK; |
1da177e4 LT |
525 | } |
526 | if (skb->sk) | |
527 | skb_set_owner_w(new_skb, skb->sk); | |
528 | dev_kfree_skb(skb); | |
529 | skb = new_skb; | |
eddc9ec5 | 530 | old_iph = ip_hdr(skb); |
1da177e4 LT |
531 | } |
532 | ||
b0e380b1 | 533 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
534 | skb_push(skb, sizeof(struct iphdr)); |
535 | skb_reset_network_header(skb); | |
1da177e4 | 536 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
537 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
538 | IPSKB_REROUTED); | |
adf30907 | 539 | skb_dst_drop(skb); |
d8d1f30b | 540 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
541 | |
542 | /* | |
543 | * Push down and install the IPIP header. | |
544 | */ | |
545 | ||
eddc9ec5 | 546 | iph = ip_hdr(skb); |
1da177e4 LT |
547 | iph->version = 4; |
548 | iph->ihl = sizeof(struct iphdr)>>2; | |
549 | iph->frag_off = df; | |
550 | iph->protocol = IPPROTO_IPIP; | |
551 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
552 | iph->daddr = rt->rt_dst; | |
553 | iph->saddr = rt->rt_src; | |
554 | ||
555 | if ((iph->ttl = tiph->ttl) == 0) | |
556 | iph->ttl = old_iph->ttl; | |
557 | ||
558 | nf_reset(skb); | |
3c97af99 ED |
559 | tstats = this_cpu_ptr(dev->tstats); |
560 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 561 | return NETDEV_TX_OK; |
1da177e4 LT |
562 | |
563 | tx_error_icmp: | |
564 | dst_link_failure(skb); | |
565 | tx_error: | |
3c97af99 | 566 | dev->stats.tx_errors++; |
1da177e4 | 567 | dev_kfree_skb(skb); |
6ed10654 | 568 | return NETDEV_TX_OK; |
1da177e4 LT |
569 | } |
570 | ||
5533995b MS |
571 | static void ipip_tunnel_bind_dev(struct net_device *dev) |
572 | { | |
573 | struct net_device *tdev = NULL; | |
574 | struct ip_tunnel *tunnel; | |
b71d1d42 | 575 | const struct iphdr *iph; |
5533995b MS |
576 | |
577 | tunnel = netdev_priv(dev); | |
578 | iph = &tunnel->parms.iph; | |
579 | ||
580 | if (iph->daddr) { | |
78fbfd8a DM |
581 | struct rtable *rt = ip_route_output_ports(dev_net(dev), NULL, |
582 | iph->daddr, iph->saddr, | |
583 | 0, 0, | |
584 | IPPROTO_IPIP, | |
585 | RT_TOS(iph->tos), | |
586 | tunnel->parms.link); | |
3c97af99 | 587 | |
b23dd4fe | 588 | if (!IS_ERR(rt)) { |
d8d1f30b | 589 | tdev = rt->dst.dev; |
5533995b MS |
590 | ip_rt_put(rt); |
591 | } | |
592 | dev->flags |= IFF_POINTOPOINT; | |
593 | } | |
594 | ||
595 | if (!tdev && tunnel->parms.link) | |
b99f0152 | 596 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
5533995b MS |
597 | |
598 | if (tdev) { | |
599 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
600 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
601 | } | |
602 | dev->iflink = tunnel->parms.link; | |
603 | } | |
604 | ||
1da177e4 LT |
605 | static int |
606 | ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
607 | { | |
608 | int err = 0; | |
609 | struct ip_tunnel_parm p; | |
610 | struct ip_tunnel *t; | |
b9855c54 PE |
611 | struct net *net = dev_net(dev); |
612 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
1da177e4 LT |
613 | |
614 | switch (cmd) { | |
615 | case SIOCGETTUNNEL: | |
616 | t = NULL; | |
b9855c54 | 617 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
618 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
619 | err = -EFAULT; | |
620 | break; | |
621 | } | |
b9fae5c9 | 622 | t = ipip_tunnel_locate(net, &p, 0); |
1da177e4 LT |
623 | } |
624 | if (t == NULL) | |
2941a486 | 625 | t = netdev_priv(dev); |
1da177e4 LT |
626 | memcpy(&p, &t->parms, sizeof(p)); |
627 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
628 | err = -EFAULT; | |
629 | break; | |
630 | ||
631 | case SIOCADDTUNNEL: | |
632 | case SIOCCHGTUNNEL: | |
633 | err = -EPERM; | |
634 | if (!capable(CAP_NET_ADMIN)) | |
635 | goto done; | |
636 | ||
637 | err = -EFAULT; | |
638 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
639 | goto done; | |
640 | ||
641 | err = -EINVAL; | |
642 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || | |
643 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
644 | goto done; | |
645 | if (p.iph.ttl) | |
646 | p.iph.frag_off |= htons(IP_DF); | |
647 | ||
b9fae5c9 | 648 | t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 649 | |
b9855c54 | 650 | if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
651 | if (t != NULL) { |
652 | if (t->dev != dev) { | |
653 | err = -EEXIST; | |
654 | break; | |
655 | } | |
656 | } else { | |
657 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
658 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
659 | err = -EINVAL; | |
660 | break; | |
661 | } | |
2941a486 | 662 | t = netdev_priv(dev); |
b9fae5c9 | 663 | ipip_tunnel_unlink(ipn, t); |
74b0b85b | 664 | synchronize_net(); |
1da177e4 LT |
665 | t->parms.iph.saddr = p.iph.saddr; |
666 | t->parms.iph.daddr = p.iph.daddr; | |
667 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
668 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
b9fae5c9 | 669 | ipip_tunnel_link(ipn, t); |
1da177e4 LT |
670 | netdev_state_change(dev); |
671 | } | |
672 | } | |
673 | ||
674 | if (t) { | |
675 | err = 0; | |
676 | if (cmd == SIOCCHGTUNNEL) { | |
677 | t->parms.iph.ttl = p.iph.ttl; | |
678 | t->parms.iph.tos = p.iph.tos; | |
679 | t->parms.iph.frag_off = p.iph.frag_off; | |
5533995b MS |
680 | if (t->parms.link != p.link) { |
681 | t->parms.link = p.link; | |
682 | ipip_tunnel_bind_dev(dev); | |
683 | netdev_state_change(dev); | |
684 | } | |
1da177e4 LT |
685 | } |
686 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
687 | err = -EFAULT; | |
688 | } else | |
689 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
690 | break; | |
691 | ||
692 | case SIOCDELTUNNEL: | |
693 | err = -EPERM; | |
694 | if (!capable(CAP_NET_ADMIN)) | |
695 | goto done; | |
696 | ||
b9855c54 | 697 | if (dev == ipn->fb_tunnel_dev) { |
1da177e4 LT |
698 | err = -EFAULT; |
699 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
700 | goto done; | |
701 | err = -ENOENT; | |
b9fae5c9 | 702 | if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
703 | goto done; |
704 | err = -EPERM; | |
b9855c54 | 705 | if (t->dev == ipn->fb_tunnel_dev) |
1da177e4 LT |
706 | goto done; |
707 | dev = t->dev; | |
708 | } | |
22f8cde5 SH |
709 | unregister_netdevice(dev); |
710 | err = 0; | |
1da177e4 LT |
711 | break; |
712 | ||
713 | default: | |
714 | err = -EINVAL; | |
715 | } | |
716 | ||
717 | done: | |
718 | return err; | |
719 | } | |
720 | ||
1da177e4 LT |
721 | static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
722 | { | |
723 | if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
724 | return -EINVAL; | |
725 | dev->mtu = new_mtu; | |
726 | return 0; | |
727 | } | |
728 | ||
23a12b14 SH |
729 | static const struct net_device_ops ipip_netdev_ops = { |
730 | .ndo_uninit = ipip_tunnel_uninit, | |
731 | .ndo_start_xmit = ipip_tunnel_xmit, | |
732 | .ndo_do_ioctl = ipip_tunnel_ioctl, | |
733 | .ndo_change_mtu = ipip_tunnel_change_mtu, | |
3c97af99 | 734 | .ndo_get_stats = ipip_get_stats, |
23a12b14 SH |
735 | }; |
736 | ||
3c97af99 ED |
737 | static void ipip_dev_free(struct net_device *dev) |
738 | { | |
739 | free_percpu(dev->tstats); | |
740 | free_netdev(dev); | |
741 | } | |
742 | ||
1da177e4 LT |
743 | static void ipip_tunnel_setup(struct net_device *dev) |
744 | { | |
23a12b14 | 745 | dev->netdev_ops = &ipip_netdev_ops; |
3c97af99 | 746 | dev->destructor = ipip_dev_free; |
1da177e4 LT |
747 | |
748 | dev->type = ARPHRD_TUNNEL; | |
749 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 750 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
751 | dev->flags = IFF_NOARP; |
752 | dev->iflink = 0; | |
753 | dev->addr_len = 4; | |
0a826406 | 754 | dev->features |= NETIF_F_NETNS_LOCAL; |
153f0943 | 755 | dev->features |= NETIF_F_LLTX; |
28e72216 | 756 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
757 | } |
758 | ||
3c97af99 | 759 | static int ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 760 | { |
23a12b14 | 761 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
762 | |
763 | tunnel->dev = dev; | |
764 | strcpy(tunnel->parms.name, dev->name); | |
765 | ||
766 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
767 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
768 | ||
5533995b | 769 | ipip_tunnel_bind_dev(dev); |
3c97af99 ED |
770 | |
771 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
772 | if (!dev->tstats) | |
773 | return -ENOMEM; | |
774 | ||
775 | return 0; | |
1da177e4 LT |
776 | } |
777 | ||
fada5636 | 778 | static int __net_init ipip_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 779 | { |
2941a486 | 780 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 781 | struct iphdr *iph = &tunnel->parms.iph; |
44d3c299 | 782 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
1da177e4 LT |
783 | |
784 | tunnel->dev = dev; | |
785 | strcpy(tunnel->parms.name, dev->name); | |
786 | ||
787 | iph->version = 4; | |
788 | iph->protocol = IPPROTO_IPIP; | |
789 | iph->ihl = 5; | |
790 | ||
fada5636 ED |
791 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
792 | if (!dev->tstats) | |
793 | return -ENOMEM; | |
794 | ||
1da177e4 | 795 | dev_hold(dev); |
b7285b79 | 796 | rcu_assign_pointer(ipn->tunnels_wc[0], tunnel); |
fada5636 | 797 | return 0; |
1da177e4 LT |
798 | } |
799 | ||
6dcd814b | 800 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1da177e4 LT |
801 | .handler = ipip_rcv, |
802 | .err_handler = ipip_err, | |
d2acc347 | 803 | .priority = 1, |
1da177e4 LT |
804 | }; |
805 | ||
5747a1aa | 806 | static const char banner[] __initconst = |
1da177e4 LT |
807 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
808 | ||
0694c4c0 | 809 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) |
44d3c299 PE |
810 | { |
811 | int prio; | |
812 | ||
813 | for (prio = 1; prio < 4; prio++) { | |
814 | int h; | |
815 | for (h = 0; h < HASH_SIZE; h++) { | |
b7285b79 | 816 | struct ip_tunnel *t; |
0694c4c0 | 817 | |
b7285b79 | 818 | t = rtnl_dereference(ipn->tunnels[prio][h]); |
0694c4c0 ED |
819 | while (t != NULL) { |
820 | unregister_netdevice_queue(t->dev, head); | |
b7285b79 | 821 | t = rtnl_dereference(t->next); |
0694c4c0 | 822 | } |
44d3c299 PE |
823 | } |
824 | } | |
825 | } | |
826 | ||
2c8c1e72 | 827 | static int __net_init ipip_init_net(struct net *net) |
10dc4c7b | 828 | { |
86de8a63 | 829 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
10dc4c7b | 830 | int err; |
10dc4c7b | 831 | |
44d3c299 PE |
832 | ipn->tunnels[0] = ipn->tunnels_wc; |
833 | ipn->tunnels[1] = ipn->tunnels_l; | |
834 | ipn->tunnels[2] = ipn->tunnels_r; | |
835 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
836 | ||
b9855c54 PE |
837 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
838 | "tunl0", | |
839 | ipip_tunnel_setup); | |
840 | if (!ipn->fb_tunnel_dev) { | |
841 | err = -ENOMEM; | |
842 | goto err_alloc_dev; | |
843 | } | |
be77e593 | 844 | dev_net_set(ipn->fb_tunnel_dev, net); |
b9855c54 | 845 | |
fada5636 ED |
846 | err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
847 | if (err) | |
848 | goto err_reg_dev; | |
b9855c54 PE |
849 | |
850 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
851 | goto err_reg_dev; | |
852 | ||
10dc4c7b PE |
853 | return 0; |
854 | ||
b9855c54 | 855 | err_reg_dev: |
fada5636 | 856 | ipip_dev_free(ipn->fb_tunnel_dev); |
b9855c54 PE |
857 | err_alloc_dev: |
858 | /* nothing */ | |
10dc4c7b PE |
859 | return err; |
860 | } | |
861 | ||
2c8c1e72 | 862 | static void __net_exit ipip_exit_net(struct net *net) |
10dc4c7b | 863 | { |
86de8a63 | 864 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
0694c4c0 | 865 | LIST_HEAD(list); |
10dc4c7b | 866 | |
b9855c54 | 867 | rtnl_lock(); |
0694c4c0 ED |
868 | ipip_destroy_tunnels(ipn, &list); |
869 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); | |
870 | unregister_netdevice_many(&list); | |
b9855c54 | 871 | rtnl_unlock(); |
10dc4c7b PE |
872 | } |
873 | ||
874 | static struct pernet_operations ipip_net_ops = { | |
875 | .init = ipip_init_net, | |
876 | .exit = ipip_exit_net, | |
86de8a63 EB |
877 | .id = &ipip_net_id, |
878 | .size = sizeof(struct ipip_net), | |
10dc4c7b PE |
879 | }; |
880 | ||
1da177e4 LT |
881 | static int __init ipip_init(void) |
882 | { | |
883 | int err; | |
884 | ||
885 | printk(banner); | |
886 | ||
d5aa407f AD |
887 | err = register_pernet_device(&ipip_net_ops); |
888 | if (err < 0) | |
889 | return err; | |
890 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
891 | if (err < 0) { | |
892 | unregister_pernet_device(&ipip_net_ops); | |
1da177e4 | 893 | printk(KERN_INFO "ipip init: can't register tunnel\n"); |
1da177e4 | 894 | } |
1da177e4 | 895 | return err; |
1da177e4 LT |
896 | } |
897 | ||
898 | static void __exit ipip_fini(void) | |
899 | { | |
c0d56408 | 900 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
1da177e4 LT |
901 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); |
902 | ||
86de8a63 | 903 | unregister_pernet_device(&ipip_net_ops); |
1da177e4 LT |
904 | } |
905 | ||
906 | module_init(ipip_init); | |
907 | module_exit(ipip_fini); | |
908 | MODULE_LICENSE("GPL"); | |
8909c9ad | 909 | MODULE_ALIAS_NETDEV("tunl0"); |