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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 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 | |
f99189b1 | 122 | static int ipip_net_id __read_mostly; |
10dc4c7b | 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 | 133 | static void ipip_tunnel_init(struct net_device *dev); |
1da177e4 LT |
134 | static void ipip_tunnel_setup(struct net_device *dev); |
135 | ||
8f95dd63 ED |
136 | /* |
137 | * Locking : hash tables are protected by RCU and a spinlock | |
138 | */ | |
139 | static DEFINE_SPINLOCK(ipip_lock); | |
140 | ||
141 | #define for_each_ip_tunnel_rcu(start) \ | |
142 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 143 | |
b9fae5c9 PE |
144 | static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, |
145 | __be32 remote, __be32 local) | |
1da177e4 LT |
146 | { |
147 | unsigned h0 = HASH(remote); | |
148 | unsigned h1 = HASH(local); | |
149 | struct ip_tunnel *t; | |
44d3c299 | 150 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 151 | |
8f95dd63 | 152 | for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) |
1da177e4 LT |
153 | if (local == t->parms.iph.saddr && |
154 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
155 | return t; | |
8f95dd63 ED |
156 | |
157 | for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) | |
1da177e4 LT |
158 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
159 | return t; | |
8f95dd63 ED |
160 | |
161 | for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) | |
1da177e4 LT |
162 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
163 | return t; | |
8f95dd63 ED |
164 | |
165 | t = rcu_dereference(ipn->tunnels_wc[0]); | |
166 | if (t && (t->dev->flags&IFF_UP)) | |
1da177e4 LT |
167 | return t; |
168 | return NULL; | |
169 | } | |
170 | ||
b9fae5c9 PE |
171 | static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn, |
172 | struct ip_tunnel_parm *parms) | |
1da177e4 | 173 | { |
87d1a164 YH |
174 | __be32 remote = parms->iph.daddr; |
175 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
176 | unsigned h = 0; |
177 | int prio = 0; | |
178 | ||
179 | if (remote) { | |
180 | prio |= 2; | |
181 | h ^= HASH(remote); | |
182 | } | |
183 | if (local) { | |
184 | prio |= 1; | |
185 | h ^= HASH(local); | |
186 | } | |
44d3c299 | 187 | return &ipn->tunnels[prio][h]; |
1da177e4 LT |
188 | } |
189 | ||
b9fae5c9 PE |
190 | static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn, |
191 | struct ip_tunnel *t) | |
87d1a164 | 192 | { |
b9fae5c9 | 193 | return __ipip_bucket(ipn, &t->parms); |
87d1a164 | 194 | } |
1da177e4 | 195 | |
b9fae5c9 | 196 | static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 LT |
197 | { |
198 | struct ip_tunnel **tp; | |
199 | ||
b9fae5c9 | 200 | for (tp = ipip_bucket(ipn, t); *tp; tp = &(*tp)->next) { |
1da177e4 | 201 | if (t == *tp) { |
8f95dd63 | 202 | spin_lock_bh(&ipip_lock); |
1da177e4 | 203 | *tp = t->next; |
8f95dd63 | 204 | spin_unlock_bh(&ipip_lock); |
1da177e4 LT |
205 | break; |
206 | } | |
207 | } | |
208 | } | |
209 | ||
b9fae5c9 | 210 | static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) |
1da177e4 | 211 | { |
b9fae5c9 | 212 | struct ip_tunnel **tp = ipip_bucket(ipn, t); |
1da177e4 | 213 | |
8f95dd63 | 214 | spin_lock_bh(&ipip_lock); |
1da177e4 | 215 | t->next = *tp; |
8f95dd63 ED |
216 | rcu_assign_pointer(*tp, t); |
217 | spin_unlock_bh(&ipip_lock); | |
1da177e4 LT |
218 | } |
219 | ||
b9fae5c9 PE |
220 | static struct ip_tunnel * ipip_tunnel_locate(struct net *net, |
221 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 222 | { |
d5a0a1e3 AV |
223 | __be32 remote = parms->iph.daddr; |
224 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
225 | struct ip_tunnel *t, **tp, *nt; |
226 | struct net_device *dev; | |
1da177e4 | 227 | char name[IFNAMSIZ]; |
b9fae5c9 | 228 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
1da177e4 | 229 | |
b9fae5c9 | 230 | for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
231 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
232 | return t; | |
233 | } | |
234 | if (!create) | |
235 | return NULL; | |
236 | ||
237 | if (parms->name[0]) | |
238 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
239 | else |
240 | sprintf(name, "tunl%%d"); | |
1da177e4 LT |
241 | |
242 | dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); | |
243 | if (dev == NULL) | |
244 | return NULL; | |
245 | ||
0a826406 PE |
246 | dev_net_set(dev, net); |
247 | ||
b37d428b PE |
248 | if (strchr(name, '%')) { |
249 | if (dev_alloc_name(dev, name) < 0) | |
250 | goto failed_free; | |
251 | } | |
252 | ||
2941a486 | 253 | nt = netdev_priv(dev); |
1da177e4 LT |
254 | nt->parms = *parms; |
255 | ||
23a12b14 SH |
256 | ipip_tunnel_init(dev); |
257 | ||
b37d428b PE |
258 | if (register_netdevice(dev) < 0) |
259 | goto failed_free; | |
1da177e4 LT |
260 | |
261 | dev_hold(dev); | |
b9fae5c9 | 262 | ipip_tunnel_link(ipn, nt); |
1da177e4 LT |
263 | return nt; |
264 | ||
b37d428b PE |
265 | failed_free: |
266 | free_netdev(dev); | |
1da177e4 LT |
267 | return NULL; |
268 | } | |
269 | ||
270 | static void ipip_tunnel_uninit(struct net_device *dev) | |
271 | { | |
b9855c54 PE |
272 | struct net *net = dev_net(dev); |
273 | struct ipip_net *ipn = net_generic(net, ipip_net_id); | |
274 | ||
275 | if (dev == ipn->fb_tunnel_dev) { | |
8f95dd63 | 276 | spin_lock_bh(&ipip_lock); |
44d3c299 | 277 | ipn->tunnels_wc[0] = NULL; |
8f95dd63 | 278 | spin_unlock_bh(&ipip_lock); |
1da177e4 | 279 | } else |
b9fae5c9 | 280 | ipip_tunnel_unlink(ipn, netdev_priv(dev)); |
1da177e4 LT |
281 | dev_put(dev); |
282 | } | |
283 | ||
d2acc347 | 284 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 285 | { |
1da177e4 | 286 | |
071f92d0 | 287 | /* All the routers (except for Linux) return only |
1da177e4 LT |
288 | 8 bytes of packet payload. It means, that precise relaying of |
289 | ICMP in the real Internet is absolutely infeasible. | |
290 | */ | |
5a5f3a8d | 291 | struct iphdr *iph = (struct iphdr *)skb->data; |
88c7664f ACM |
292 | const int type = icmp_hdr(skb)->type; |
293 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 294 | struct ip_tunnel *t; |
d2acc347 | 295 | int err; |
1da177e4 LT |
296 | |
297 | switch (type) { | |
298 | default: | |
299 | case ICMP_PARAMETERPROB: | |
d2acc347 | 300 | return 0; |
1da177e4 LT |
301 | |
302 | case ICMP_DEST_UNREACH: | |
303 | switch (code) { | |
304 | case ICMP_SR_FAILED: | |
305 | case ICMP_PORT_UNREACH: | |
306 | /* Impossible event. */ | |
d2acc347 | 307 | return 0; |
1da177e4 LT |
308 | case ICMP_FRAG_NEEDED: |
309 | /* Soft state for pmtu is maintained by IP core. */ | |
d2acc347 | 310 | return 0; |
1da177e4 LT |
311 | default: |
312 | /* All others are translated to HOST_UNREACH. | |
313 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
314 | I believe they are just ether pollution. --ANK | |
315 | */ | |
316 | break; | |
317 | } | |
318 | break; | |
319 | case ICMP_TIME_EXCEEDED: | |
320 | if (code != ICMP_EXC_TTL) | |
d2acc347 | 321 | return 0; |
1da177e4 LT |
322 | break; |
323 | } | |
324 | ||
d2acc347 HX |
325 | err = -ENOENT; |
326 | ||
8f95dd63 | 327 | rcu_read_lock(); |
cec3ffae | 328 | t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
329 | if (t == NULL || t->parms.iph.daddr == 0) |
330 | goto out; | |
d2acc347 HX |
331 | |
332 | err = 0; | |
1da177e4 LT |
333 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
334 | goto out; | |
335 | ||
26d94b46 | 336 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
337 | t->err_count++; |
338 | else | |
339 | t->err_count = 1; | |
340 | t->err_time = jiffies; | |
341 | out: | |
8f95dd63 | 342 | rcu_read_unlock(); |
d2acc347 | 343 | return err; |
1da177e4 LT |
344 | } |
345 | ||
eddc9ec5 ACM |
346 | static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, |
347 | struct sk_buff *skb) | |
1da177e4 | 348 | { |
eddc9ec5 | 349 | struct iphdr *inner_iph = ip_hdr(skb); |
1da177e4 LT |
350 | |
351 | if (INET_ECN_is_ce(outer_iph->tos)) | |
352 | IP_ECN_set_ce(inner_iph); | |
353 | } | |
354 | ||
355 | static int ipip_rcv(struct sk_buff *skb) | |
356 | { | |
1da177e4 | 357 | struct ip_tunnel *tunnel; |
eddc9ec5 | 358 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 359 | |
8f95dd63 | 360 | rcu_read_lock(); |
cec3ffae | 361 | if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev), |
b9fae5c9 | 362 | iph->saddr, iph->daddr)) != NULL) { |
1da177e4 | 363 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
8f95dd63 | 364 | rcu_read_unlock(); |
1da177e4 LT |
365 | kfree_skb(skb); |
366 | return 0; | |
367 | } | |
368 | ||
369 | secpath_reset(skb); | |
370 | ||
b0e380b1 | 371 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 372 | skb_reset_network_header(skb); |
1da177e4 LT |
373 | skb->protocol = htons(ETH_P_IP); |
374 | skb->pkt_type = PACKET_HOST; | |
375 | ||
50f59cea PE |
376 | tunnel->dev->stats.rx_packets++; |
377 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 378 | skb->dev = tunnel->dev; |
adf30907 | 379 | skb_dst_drop(skb); |
1da177e4 LT |
380 | nf_reset(skb); |
381 | ipip_ecn_decapsulate(iph, skb); | |
382 | netif_rx(skb); | |
8f95dd63 | 383 | rcu_read_unlock(); |
1da177e4 LT |
384 | return 0; |
385 | } | |
8f95dd63 | 386 | rcu_read_unlock(); |
1da177e4 | 387 | |
1da177e4 LT |
388 | return -1; |
389 | } | |
390 | ||
391 | /* | |
392 | * This function assumes it is being called from dev_queue_xmit() | |
393 | * and that skb is filled properly by that function. | |
394 | */ | |
395 | ||
6fef4c0c | 396 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 397 | { |
2941a486 | 398 | struct ip_tunnel *tunnel = netdev_priv(dev); |
0bfbedb1 ED |
399 | struct net_device_stats *stats = &dev->stats; |
400 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
1da177e4 LT |
401 | struct iphdr *tiph = &tunnel->parms.iph; |
402 | u8 tos = tunnel->parms.iph.tos; | |
d5a0a1e3 | 403 | __be16 df = tiph->frag_off; |
1da177e4 LT |
404 | struct rtable *rt; /* Route to the other host */ |
405 | struct net_device *tdev; /* Device to other host */ | |
eddc9ec5 | 406 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 407 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 408 | unsigned int max_headroom; /* The extra header space needed */ |
d5a0a1e3 | 409 | __be32 dst = tiph->daddr; |
1da177e4 LT |
410 | int mtu; |
411 | ||
1da177e4 LT |
412 | if (skb->protocol != htons(ETH_P_IP)) |
413 | goto tx_error; | |
414 | ||
415 | if (tos&1) | |
416 | tos = old_iph->tos; | |
417 | ||
418 | if (!dst) { | |
419 | /* NBMA tunnel */ | |
511c3f92 | 420 | if ((rt = skb_rtable(skb)) == NULL) { |
50f59cea | 421 | stats->tx_fifo_errors++; |
1da177e4 LT |
422 | goto tx_error; |
423 | } | |
424 | if ((dst = rt->rt_gateway) == 0) | |
425 | goto tx_error_icmp; | |
426 | } | |
427 | ||
428 | { | |
429 | struct flowi fl = { .oif = tunnel->parms.link, | |
430 | .nl_u = { .ip4_u = | |
431 | { .daddr = dst, | |
432 | .saddr = tiph->saddr, | |
433 | .tos = RT_TOS(tos) } }, | |
434 | .proto = IPPROTO_IPIP }; | |
b99f0152 | 435 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
50f59cea | 436 | stats->tx_carrier_errors++; |
1da177e4 LT |
437 | goto tx_error_icmp; |
438 | } | |
439 | } | |
440 | tdev = rt->u.dst.dev; | |
441 | ||
442 | if (tdev == dev) { | |
443 | ip_rt_put(rt); | |
50f59cea | 444 | stats->collisions++; |
1da177e4 LT |
445 | goto tx_error; |
446 | } | |
447 | ||
23ca0c98 HX |
448 | df |= old_iph->frag_off & htons(IP_DF); |
449 | ||
450 | if (df) { | |
1da177e4 | 451 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); |
1da177e4 | 452 | |
23ca0c98 HX |
453 | if (mtu < 68) { |
454 | stats->collisions++; | |
455 | ip_rt_put(rt); | |
456 | goto tx_error; | |
457 | } | |
1da177e4 | 458 | |
23ca0c98 HX |
459 | if (skb_dst(skb)) |
460 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 461 | |
23ca0c98 HX |
462 | if ((old_iph->frag_off & htons(IP_DF)) && |
463 | mtu < ntohs(old_iph->tot_len)) { | |
464 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
465 | htonl(mtu)); | |
466 | ip_rt_put(rt); | |
467 | goto tx_error; | |
468 | } | |
1da177e4 LT |
469 | } |
470 | ||
471 | if (tunnel->err_count > 0) { | |
26d94b46 WY |
472 | if (time_before(jiffies, |
473 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
474 | tunnel->err_count--; |
475 | dst_link_failure(skb); | |
476 | } else | |
477 | tunnel->err_count = 0; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Okay, now see if we can stuff it in the buffer as-is. | |
482 | */ | |
483 | max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); | |
484 | ||
cfbba49d PM |
485 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
486 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
487 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
488 | if (!new_skb) { | |
489 | ip_rt_put(rt); | |
0bfbedb1 | 490 | txq->tx_dropped++; |
1da177e4 | 491 | dev_kfree_skb(skb); |
6ed10654 | 492 | return NETDEV_TX_OK; |
1da177e4 LT |
493 | } |
494 | if (skb->sk) | |
495 | skb_set_owner_w(new_skb, skb->sk); | |
496 | dev_kfree_skb(skb); | |
497 | skb = new_skb; | |
eddc9ec5 | 498 | old_iph = ip_hdr(skb); |
1da177e4 LT |
499 | } |
500 | ||
b0e380b1 | 501 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
502 | skb_push(skb, sizeof(struct iphdr)); |
503 | skb_reset_network_header(skb); | |
1da177e4 | 504 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
505 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
506 | IPSKB_REROUTED); | |
adf30907 ED |
507 | skb_dst_drop(skb); |
508 | skb_dst_set(skb, &rt->u.dst); | |
1da177e4 LT |
509 | |
510 | /* | |
511 | * Push down and install the IPIP header. | |
512 | */ | |
513 | ||
eddc9ec5 | 514 | iph = ip_hdr(skb); |
1da177e4 LT |
515 | iph->version = 4; |
516 | iph->ihl = sizeof(struct iphdr)>>2; | |
517 | iph->frag_off = df; | |
518 | iph->protocol = IPPROTO_IPIP; | |
519 | iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); | |
520 | iph->daddr = rt->rt_dst; | |
521 | iph->saddr = rt->rt_src; | |
522 | ||
523 | if ((iph->ttl = tiph->ttl) == 0) | |
524 | iph->ttl = old_iph->ttl; | |
525 | ||
526 | nf_reset(skb); | |
527 | ||
528 | IPTUNNEL_XMIT(); | |
6ed10654 | 529 | return NETDEV_TX_OK; |
1da177e4 LT |
530 | |
531 | tx_error_icmp: | |
532 | dst_link_failure(skb); | |
533 | tx_error: | |
534 | stats->tx_errors++; | |
535 | dev_kfree_skb(skb); | |
6ed10654 | 536 | return NETDEV_TX_OK; |
1da177e4 LT |
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; |
28e72216 | 716 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
717 | } |
718 | ||
23a12b14 | 719 | static void ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 720 | { |
23a12b14 | 721 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
722 | |
723 | tunnel->dev = dev; | |
724 | strcpy(tunnel->parms.name, dev->name); | |
725 | ||
726 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
727 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
728 | ||
5533995b | 729 | ipip_tunnel_bind_dev(dev); |
1da177e4 LT |
730 | } |
731 | ||
2c8c1e72 | 732 | static void __net_init ipip_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 733 | { |
2941a486 | 734 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 735 | struct iphdr *iph = &tunnel->parms.iph; |
44d3c299 | 736 | struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); |
1da177e4 LT |
737 | |
738 | tunnel->dev = dev; | |
739 | strcpy(tunnel->parms.name, dev->name); | |
740 | ||
741 | iph->version = 4; | |
742 | iph->protocol = IPPROTO_IPIP; | |
743 | iph->ihl = 5; | |
744 | ||
745 | dev_hold(dev); | |
44d3c299 | 746 | ipn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
747 | } |
748 | ||
749 | static struct xfrm_tunnel ipip_handler = { | |
750 | .handler = ipip_rcv, | |
751 | .err_handler = ipip_err, | |
d2acc347 | 752 | .priority = 1, |
1da177e4 LT |
753 | }; |
754 | ||
5747a1aa | 755 | static const char banner[] __initconst = |
1da177e4 LT |
756 | KERN_INFO "IPv4 over IPv4 tunneling driver\n"; |
757 | ||
0694c4c0 | 758 | static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) |
44d3c299 PE |
759 | { |
760 | int prio; | |
761 | ||
762 | for (prio = 1; prio < 4; prio++) { | |
763 | int h; | |
764 | for (h = 0; h < HASH_SIZE; h++) { | |
0694c4c0 ED |
765 | struct ip_tunnel *t = ipn->tunnels[prio][h]; |
766 | ||
767 | while (t != NULL) { | |
768 | unregister_netdevice_queue(t->dev, head); | |
769 | t = t->next; | |
770 | } | |
44d3c299 PE |
771 | } |
772 | } | |
773 | } | |
774 | ||
2c8c1e72 | 775 | static int __net_init ipip_init_net(struct net *net) |
10dc4c7b | 776 | { |
86de8a63 | 777 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
10dc4c7b | 778 | int err; |
10dc4c7b | 779 | |
44d3c299 PE |
780 | ipn->tunnels[0] = ipn->tunnels_wc; |
781 | ipn->tunnels[1] = ipn->tunnels_l; | |
782 | ipn->tunnels[2] = ipn->tunnels_r; | |
783 | ipn->tunnels[3] = ipn->tunnels_r_l; | |
784 | ||
b9855c54 PE |
785 | ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), |
786 | "tunl0", | |
787 | ipip_tunnel_setup); | |
788 | if (!ipn->fb_tunnel_dev) { | |
789 | err = -ENOMEM; | |
790 | goto err_alloc_dev; | |
791 | } | |
be77e593 | 792 | dev_net_set(ipn->fb_tunnel_dev, net); |
b9855c54 | 793 | |
23a12b14 | 794 | ipip_fb_tunnel_init(ipn->fb_tunnel_dev); |
b9855c54 PE |
795 | |
796 | if ((err = register_netdev(ipn->fb_tunnel_dev))) | |
797 | goto err_reg_dev; | |
798 | ||
10dc4c7b PE |
799 | return 0; |
800 | ||
b9855c54 PE |
801 | err_reg_dev: |
802 | free_netdev(ipn->fb_tunnel_dev); | |
803 | err_alloc_dev: | |
804 | /* nothing */ | |
10dc4c7b PE |
805 | return err; |
806 | } | |
807 | ||
2c8c1e72 | 808 | static void __net_exit ipip_exit_net(struct net *net) |
10dc4c7b | 809 | { |
86de8a63 | 810 | struct ipip_net *ipn = net_generic(net, ipip_net_id); |
0694c4c0 | 811 | LIST_HEAD(list); |
10dc4c7b | 812 | |
b9855c54 | 813 | rtnl_lock(); |
0694c4c0 ED |
814 | ipip_destroy_tunnels(ipn, &list); |
815 | unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); | |
816 | unregister_netdevice_many(&list); | |
b9855c54 | 817 | rtnl_unlock(); |
10dc4c7b PE |
818 | } |
819 | ||
820 | static struct pernet_operations ipip_net_ops = { | |
821 | .init = ipip_init_net, | |
822 | .exit = ipip_exit_net, | |
86de8a63 EB |
823 | .id = &ipip_net_id, |
824 | .size = sizeof(struct ipip_net), | |
10dc4c7b PE |
825 | }; |
826 | ||
1da177e4 LT |
827 | static int __init ipip_init(void) |
828 | { | |
829 | int err; | |
830 | ||
831 | printk(banner); | |
832 | ||
d5aa407f AD |
833 | err = register_pernet_device(&ipip_net_ops); |
834 | if (err < 0) | |
835 | return err; | |
836 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
837 | if (err < 0) { | |
838 | unregister_pernet_device(&ipip_net_ops); | |
1da177e4 | 839 | printk(KERN_INFO "ipip init: can't register tunnel\n"); |
1da177e4 | 840 | } |
1da177e4 | 841 | return err; |
1da177e4 LT |
842 | } |
843 | ||
844 | static void __exit ipip_fini(void) | |
845 | { | |
c0d56408 | 846 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
1da177e4 LT |
847 | printk(KERN_INFO "ipip close: can't deregister tunnel\n"); |
848 | ||
86de8a63 | 849 | unregister_pernet_device(&ipip_net_ops); |
1da177e4 LT |
850 | } |
851 | ||
852 | module_init(ipip_init); | |
853 | module_exit(ipip_fini); | |
854 | MODULE_LICENSE("GPL"); |