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1da177e4 | 1 | /* |
e905a9ed | 2 | * Linux NET3: GRE over IP protocol decoder. |
1da177e4 LT |
3 | * |
4 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
afd46503 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/types.h> | |
1da177e4 | 18 | #include <linux/kernel.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <asm/uaccess.h> |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/tcp.h> | |
25 | #include <linux/udp.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/mroute.h> | |
2e15ea39 | 28 | #include <linux/if_vlan.h> |
1da177e4 LT |
29 | #include <linux/init.h> |
30 | #include <linux/in6.h> | |
31 | #include <linux/inetdevice.h> | |
32 | #include <linux/igmp.h> | |
33 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 34 | #include <linux/etherdevice.h> |
46f25dff | 35 | #include <linux/if_ether.h> |
1da177e4 LT |
36 | |
37 | #include <net/sock.h> | |
38 | #include <net/ip.h> | |
39 | #include <net/icmp.h> | |
40 | #include <net/protocol.h> | |
c5441932 | 41 | #include <net/ip_tunnels.h> |
1da177e4 LT |
42 | #include <net/arp.h> |
43 | #include <net/checksum.h> | |
44 | #include <net/dsfield.h> | |
45 | #include <net/inet_ecn.h> | |
46 | #include <net/xfrm.h> | |
59a4c759 PE |
47 | #include <net/net_namespace.h> |
48 | #include <net/netns/generic.h> | |
c19e654d | 49 | #include <net/rtnetlink.h> |
00959ade | 50 | #include <net/gre.h> |
2e15ea39 | 51 | #include <net/dst_metadata.h> |
1da177e4 | 52 | |
dfd56b8b | 53 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
54 | #include <net/ipv6.h> |
55 | #include <net/ip6_fib.h> | |
56 | #include <net/ip6_route.h> | |
57 | #endif | |
58 | ||
59 | /* | |
60 | Problems & solutions | |
61 | -------------------- | |
62 | ||
63 | 1. The most important issue is detecting local dead loops. | |
64 | They would cause complete host lockup in transmit, which | |
65 | would be "resolved" by stack overflow or, if queueing is enabled, | |
66 | with infinite looping in net_bh. | |
67 | ||
68 | We cannot track such dead loops during route installation, | |
69 | it is infeasible task. The most general solutions would be | |
70 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 71 | and silently drop packet when it expires. It is a good |
bff52857 | 72 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
73 | skb, even if no tunneling is used. |
74 | ||
6d0722a2 ED |
75 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
76 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
77 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
78 | |
79 | 2. Networking dead loops would not kill routers, but would really | |
80 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
81 | if we copy it from packet being encapsulated to upper header. | |
82 | It is very good solution, but it introduces two problems: | |
83 | ||
84 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
85 | do not work over tunnels. | |
86 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
87 | so that this problem would be solved and traceroute output | |
88 | would even more informative. This idea appeared to be wrong: | |
89 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
90 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
91 | return only 8 bytes of payload. It is the end. | |
92 | ||
93 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
94 | we should search for another solution. | |
95 | ||
96 | One of them is to parse packet trying to detect inner encapsulation | |
97 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 98 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
99 | |
100 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
101 | We force DF flag on tunnels with preconfigured hop limit, | |
102 | that is ALL. :-) Well, it does not remove the problem completely, | |
103 | but exponential growth of network traffic is changed to linear | |
104 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 105 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
106 | Yes, it is not good if there exists a router in the loop, |
107 | which does not force DF, even when encapsulating packets have DF set. | |
108 | But it is not our problem! Nobody could accuse us, we made | |
109 | all that we could make. Even if it is your gated who injected | |
110 | fatal route to network, even if it were you who configured | |
111 | fatal static route: you are innocent. :-) | |
112 | ||
1da177e4 LT |
113 | Alexey Kuznetsov. |
114 | */ | |
115 | ||
eccc1bb8 | 116 | static bool log_ecn_error = true; |
117 | module_param(log_ecn_error, bool, 0644); | |
118 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
119 | ||
c19e654d | 120 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 | 121 | static int ipgre_tunnel_init(struct net_device *dev); |
eb8ce741 | 122 | |
f99189b1 | 123 | static int ipgre_net_id __read_mostly; |
c5441932 | 124 | static int gre_tap_net_id __read_mostly; |
1da177e4 | 125 | |
9f57c67c PS |
126 | static int ip_gre_calc_hlen(__be16 o_flags) |
127 | { | |
128 | int addend = 4; | |
129 | ||
130 | if (o_flags & TUNNEL_CSUM) | |
131 | addend += 4; | |
132 | if (o_flags & TUNNEL_KEY) | |
133 | addend += 4; | |
134 | if (o_flags & TUNNEL_SEQ) | |
135 | addend += 4; | |
136 | return addend; | |
137 | } | |
138 | ||
139 | static __be16 gre_flags_to_tnl_flags(__be16 flags) | |
140 | { | |
141 | __be16 tflags = 0; | |
142 | ||
143 | if (flags & GRE_CSUM) | |
144 | tflags |= TUNNEL_CSUM; | |
145 | if (flags & GRE_ROUTING) | |
146 | tflags |= TUNNEL_ROUTING; | |
147 | if (flags & GRE_KEY) | |
148 | tflags |= TUNNEL_KEY; | |
149 | if (flags & GRE_SEQ) | |
150 | tflags |= TUNNEL_SEQ; | |
151 | if (flags & GRE_STRICT) | |
152 | tflags |= TUNNEL_STRICT; | |
153 | if (flags & GRE_REC) | |
154 | tflags |= TUNNEL_REC; | |
155 | if (flags & GRE_VERSION) | |
156 | tflags |= TUNNEL_VERSION; | |
157 | ||
158 | return tflags; | |
159 | } | |
160 | ||
161 | static __be16 tnl_flags_to_gre_flags(__be16 tflags) | |
162 | { | |
163 | __be16 flags = 0; | |
164 | ||
165 | if (tflags & TUNNEL_CSUM) | |
166 | flags |= GRE_CSUM; | |
167 | if (tflags & TUNNEL_ROUTING) | |
168 | flags |= GRE_ROUTING; | |
169 | if (tflags & TUNNEL_KEY) | |
170 | flags |= GRE_KEY; | |
171 | if (tflags & TUNNEL_SEQ) | |
172 | flags |= GRE_SEQ; | |
173 | if (tflags & TUNNEL_STRICT) | |
174 | flags |= GRE_STRICT; | |
175 | if (tflags & TUNNEL_REC) | |
176 | flags |= GRE_REC; | |
177 | if (tflags & TUNNEL_VERSION) | |
178 | flags |= GRE_VERSION; | |
179 | ||
180 | return flags; | |
181 | } | |
182 | ||
183 | static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, | |
184 | bool *csum_err) | |
185 | { | |
186 | const struct gre_base_hdr *greh; | |
187 | __be32 *options; | |
188 | int hdr_len; | |
189 | ||
190 | if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr)))) | |
191 | return -EINVAL; | |
192 | ||
193 | greh = (struct gre_base_hdr *)skb_transport_header(skb); | |
194 | if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING))) | |
195 | return -EINVAL; | |
196 | ||
197 | tpi->flags = gre_flags_to_tnl_flags(greh->flags); | |
198 | hdr_len = ip_gre_calc_hlen(tpi->flags); | |
199 | ||
200 | if (!pskb_may_pull(skb, hdr_len)) | |
201 | return -EINVAL; | |
202 | ||
203 | greh = (struct gre_base_hdr *)skb_transport_header(skb); | |
204 | tpi->proto = greh->protocol; | |
205 | ||
206 | options = (__be32 *)(greh + 1); | |
207 | if (greh->flags & GRE_CSUM) { | |
208 | if (skb_checksum_simple_validate(skb)) { | |
209 | *csum_err = true; | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | skb_checksum_try_convert(skb, IPPROTO_GRE, 0, | |
214 | null_compute_pseudo); | |
215 | options++; | |
216 | } | |
217 | ||
218 | if (greh->flags & GRE_KEY) { | |
219 | tpi->key = *options; | |
220 | options++; | |
221 | } else { | |
222 | tpi->key = 0; | |
223 | } | |
224 | if (unlikely(greh->flags & GRE_SEQ)) { | |
225 | tpi->seq = *options; | |
226 | options++; | |
227 | } else { | |
228 | tpi->seq = 0; | |
229 | } | |
230 | /* WCCP version 1 and 2 protocol decoding. | |
231 | * - Change protocol to IP | |
232 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
233 | */ | |
234 | if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) { | |
235 | tpi->proto = htons(ETH_P_IP); | |
236 | if ((*(u8 *)options & 0xF0) != 0x40) { | |
237 | hdr_len += 4; | |
238 | if (!pskb_may_pull(skb, hdr_len)) | |
239 | return -EINVAL; | |
240 | } | |
241 | } | |
242 | return iptunnel_pull_header(skb, hdr_len, tpi->proto); | |
243 | } | |
244 | ||
245 | static void ipgre_err(struct sk_buff *skb, u32 info, | |
246 | const struct tnl_ptk_info *tpi) | |
1da177e4 | 247 | { |
1da177e4 | 248 | |
c5441932 PS |
249 | /* All the routers (except for Linux) return only |
250 | 8 bytes of packet payload. It means, that precise relaying of | |
251 | ICMP in the real Internet is absolutely infeasible. | |
1da177e4 | 252 | |
c5441932 PS |
253 | Moreover, Cisco "wise men" put GRE key to the third word |
254 | in GRE header. It makes impossible maintaining even soft | |
255 | state for keyed GRE tunnels with enabled checksum. Tell | |
256 | them "thank you". | |
1da177e4 | 257 | |
c5441932 PS |
258 | Well, I wonder, rfc1812 was written by Cisco employee, |
259 | what the hell these idiots break standards established | |
260 | by themselves??? | |
261 | */ | |
262 | struct net *net = dev_net(skb->dev); | |
263 | struct ip_tunnel_net *itn; | |
96f5a846 | 264 | const struct iphdr *iph; |
88c7664f ACM |
265 | const int type = icmp_hdr(skb)->type; |
266 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 267 | struct ip_tunnel *t; |
1da177e4 | 268 | |
1da177e4 LT |
269 | switch (type) { |
270 | default: | |
271 | case ICMP_PARAMETERPROB: | |
9f57c67c | 272 | return; |
1da177e4 LT |
273 | |
274 | case ICMP_DEST_UNREACH: | |
275 | switch (code) { | |
276 | case ICMP_SR_FAILED: | |
277 | case ICMP_PORT_UNREACH: | |
278 | /* Impossible event. */ | |
9f57c67c | 279 | return; |
1da177e4 LT |
280 | default: |
281 | /* All others are translated to HOST_UNREACH. | |
282 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
283 | I believe they are just ether pollution. --ANK | |
284 | */ | |
285 | break; | |
286 | } | |
287 | break; | |
9f57c67c | 288 | |
1da177e4 LT |
289 | case ICMP_TIME_EXCEEDED: |
290 | if (code != ICMP_EXC_TTL) | |
9f57c67c | 291 | return; |
1da177e4 | 292 | break; |
55be7a9c DM |
293 | |
294 | case ICMP_REDIRECT: | |
295 | break; | |
1da177e4 LT |
296 | } |
297 | ||
bda7bb46 | 298 | if (tpi->proto == htons(ETH_P_TEB)) |
c5441932 PS |
299 | itn = net_generic(net, gre_tap_net_id); |
300 | else | |
301 | itn = net_generic(net, ipgre_net_id); | |
302 | ||
c0c0c50f | 303 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
bda7bb46 PS |
304 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
305 | iph->daddr, iph->saddr, tpi->key); | |
d2083287 | 306 | |
51456b29 | 307 | if (!t) |
9f57c67c | 308 | return; |
36393395 | 309 | |
36393395 | 310 | if (t->parms.iph.daddr == 0 || |
f97c1e0c | 311 | ipv4_is_multicast(t->parms.iph.daddr)) |
9f57c67c | 312 | return; |
1da177e4 LT |
313 | |
314 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
9f57c67c | 315 | return; |
1da177e4 | 316 | |
da6185d8 | 317 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
318 | t->err_count++; |
319 | else | |
320 | t->err_count = 1; | |
321 | t->err_time = jiffies; | |
9f57c67c PS |
322 | } |
323 | ||
324 | static void gre_err(struct sk_buff *skb, u32 info) | |
325 | { | |
326 | /* All the routers (except for Linux) return only | |
327 | * 8 bytes of packet payload. It means, that precise relaying of | |
328 | * ICMP in the real Internet is absolutely infeasible. | |
329 | * | |
330 | * Moreover, Cisco "wise men" put GRE key to the third word | |
331 | * in GRE header. It makes impossible maintaining even soft | |
332 | * state for keyed | |
333 | * GRE tunnels with enabled checksum. Tell them "thank you". | |
334 | * | |
335 | * Well, I wonder, rfc1812 was written by Cisco employee, | |
336 | * what the hell these idiots break standards established | |
337 | * by themselves??? | |
338 | */ | |
339 | ||
340 | const int type = icmp_hdr(skb)->type; | |
341 | const int code = icmp_hdr(skb)->code; | |
342 | struct tnl_ptk_info tpi; | |
343 | bool csum_err = false; | |
344 | ||
345 | if (parse_gre_header(skb, &tpi, &csum_err)) { | |
346 | if (!csum_err) /* ignore csum errors. */ | |
347 | return; | |
348 | } | |
349 | ||
350 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
351 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
352 | skb->dev->ifindex, 0, IPPROTO_GRE, 0); | |
353 | return; | |
354 | } | |
355 | if (type == ICMP_REDIRECT) { | |
356 | ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0, | |
357 | IPPROTO_GRE, 0); | |
358 | return; | |
359 | } | |
360 | ||
361 | ipgre_err(skb, info, &tpi); | |
1da177e4 LT |
362 | } |
363 | ||
2e15ea39 PS |
364 | static __be64 key_to_tunnel_id(__be32 key) |
365 | { | |
366 | #ifdef __BIG_ENDIAN | |
367 | return (__force __be64)((__force u32)key); | |
368 | #else | |
369 | return (__force __be64)((__force u64)key << 32); | |
370 | #endif | |
371 | } | |
372 | ||
373 | /* Returns the least-significant 32 bits of a __be64. */ | |
374 | static __be32 tunnel_id_to_key(__be64 x) | |
375 | { | |
376 | #ifdef __BIG_ENDIAN | |
377 | return (__force __be32)x; | |
378 | #else | |
379 | return (__force __be32)((__force u64)x >> 32); | |
380 | #endif | |
381 | } | |
382 | ||
bda7bb46 | 383 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) |
1da177e4 | 384 | { |
c5441932 | 385 | struct net *net = dev_net(skb->dev); |
2e15ea39 | 386 | struct metadata_dst *tun_dst = NULL; |
c5441932 | 387 | struct ip_tunnel_net *itn; |
b71d1d42 | 388 | const struct iphdr *iph; |
1da177e4 | 389 | struct ip_tunnel *tunnel; |
1da177e4 | 390 | |
bda7bb46 | 391 | if (tpi->proto == htons(ETH_P_TEB)) |
c5441932 PS |
392 | itn = net_generic(net, gre_tap_net_id); |
393 | else | |
394 | itn = net_generic(net, ipgre_net_id); | |
1da177e4 | 395 | |
c5441932 | 396 | iph = ip_hdr(skb); |
bda7bb46 PS |
397 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
398 | iph->saddr, iph->daddr, tpi->key); | |
e1a80002 | 399 | |
d2083287 | 400 | if (tunnel) { |
0e3da5bb | 401 | skb_pop_mac_header(skb); |
2e15ea39 PS |
402 | if (tunnel->collect_md) { |
403 | struct ip_tunnel_info *info; | |
404 | ||
405 | tun_dst = metadata_dst_alloc(0, GFP_ATOMIC); | |
406 | if (!tun_dst) | |
407 | return PACKET_REJECT; | |
408 | ||
409 | info = &tun_dst->u.tun_info; | |
410 | info->key.ipv4_src = iph->saddr; | |
411 | info->key.ipv4_dst = iph->daddr; | |
412 | info->key.ipv4_tos = iph->tos; | |
413 | info->key.ipv4_ttl = iph->ttl; | |
414 | ||
415 | info->mode = IP_TUNNEL_INFO_RX; | |
416 | info->key.tun_flags = tpi->flags & | |
417 | (TUNNEL_CSUM | TUNNEL_KEY); | |
418 | info->key.tun_id = key_to_tunnel_id(tpi->key); | |
419 | ||
420 | info->key.tp_src = 0; | |
421 | info->key.tp_dst = 0; | |
422 | } | |
423 | ||
424 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
bda7bb46 | 425 | return PACKET_RCVD; |
1da177e4 | 426 | } |
bda7bb46 | 427 | return PACKET_REJECT; |
1da177e4 LT |
428 | } |
429 | ||
9f57c67c PS |
430 | static int gre_rcv(struct sk_buff *skb) |
431 | { | |
432 | struct tnl_ptk_info tpi; | |
433 | bool csum_err = false; | |
434 | ||
435 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
436 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { | |
437 | /* Looped back packet, drop it! */ | |
438 | if (rt_is_output_route(skb_rtable(skb))) | |
439 | goto drop; | |
440 | } | |
441 | #endif | |
442 | ||
443 | if (parse_gre_header(skb, &tpi, &csum_err) < 0) | |
444 | goto drop; | |
445 | ||
446 | if (ipgre_rcv(skb, &tpi) == PACKET_RCVD) | |
447 | return 0; | |
448 | ||
449 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
450 | drop: | |
451 | kfree_skb(skb); | |
452 | return 0; | |
453 | } | |
454 | ||
2e15ea39 PS |
455 | static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags, |
456 | __be16 proto, __be32 key, __be32 seq) | |
457 | { | |
458 | struct gre_base_hdr *greh; | |
459 | ||
460 | skb_push(skb, hdr_len); | |
461 | ||
462 | skb_reset_transport_header(skb); | |
463 | greh = (struct gre_base_hdr *)skb->data; | |
464 | greh->flags = tnl_flags_to_gre_flags(flags); | |
465 | greh->protocol = proto; | |
466 | ||
467 | if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) { | |
468 | __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4); | |
469 | ||
470 | if (flags & TUNNEL_SEQ) { | |
471 | *ptr = seq; | |
472 | ptr--; | |
473 | } | |
474 | if (flags & TUNNEL_KEY) { | |
475 | *ptr = key; | |
476 | ptr--; | |
477 | } | |
478 | if (flags & TUNNEL_CSUM && | |
479 | !(skb_shinfo(skb)->gso_type & | |
480 | (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) { | |
481 | *ptr = 0; | |
482 | *(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0, | |
483 | skb->len, 0)); | |
484 | } | |
485 | } | |
486 | } | |
487 | ||
c5441932 PS |
488 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
489 | const struct iphdr *tnl_params, | |
490 | __be16 proto) | |
491 | { | |
492 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1da177e4 | 493 | |
c5441932 PS |
494 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
495 | tunnel->o_seqno++; | |
1da177e4 | 496 | |
c5441932 | 497 | /* Push GRE header. */ |
2e15ea39 PS |
498 | build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, |
499 | proto, tunnel->parms.o_key, htonl(tunnel->o_seqno)); | |
54bc9bac | 500 | |
2e15ea39 | 501 | skb_set_inner_protocol(skb, proto); |
bf3d6a8f | 502 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
c5441932 | 503 | } |
1da177e4 | 504 | |
b2acd1dc PS |
505 | static struct sk_buff *gre_handle_offloads(struct sk_buff *skb, |
506 | bool csum) | |
507 | { | |
508 | return iptunnel_handle_offloads(skb, csum, | |
509 | csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); | |
510 | } | |
511 | ||
2e15ea39 PS |
512 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev) |
513 | { | |
514 | struct ip_tunnel_info *tun_info; | |
515 | struct net *net = dev_net(dev); | |
516 | const struct ip_tunnel_key *key; | |
517 | struct flowi4 fl; | |
518 | struct rtable *rt; | |
519 | int min_headroom; | |
520 | int tunnel_hlen; | |
521 | __be16 df, flags; | |
522 | int err; | |
523 | ||
524 | tun_info = skb_tunnel_info(skb, AF_INET); | |
525 | if (unlikely(!tun_info || tun_info->mode != IP_TUNNEL_INFO_TX)) | |
526 | goto err_free_skb; | |
527 | ||
528 | key = &tun_info->key; | |
529 | memset(&fl, 0, sizeof(fl)); | |
530 | fl.daddr = key->ipv4_dst; | |
531 | fl.saddr = key->ipv4_src; | |
532 | fl.flowi4_tos = RT_TOS(key->ipv4_tos); | |
533 | fl.flowi4_mark = skb->mark; | |
534 | fl.flowi4_proto = IPPROTO_GRE; | |
535 | ||
536 | rt = ip_route_output_key(net, &fl); | |
537 | if (IS_ERR(rt)) | |
538 | goto err_free_skb; | |
539 | ||
540 | tunnel_hlen = ip_gre_calc_hlen(key->tun_flags); | |
541 | ||
542 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len | |
543 | + tunnel_hlen + sizeof(struct iphdr); | |
544 | if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { | |
545 | int head_delta = SKB_DATA_ALIGN(min_headroom - | |
546 | skb_headroom(skb) + | |
547 | 16); | |
548 | err = pskb_expand_head(skb, max_t(int, head_delta, 0), | |
549 | 0, GFP_ATOMIC); | |
550 | if (unlikely(err)) | |
551 | goto err_free_rt; | |
552 | } | |
553 | ||
554 | /* Push Tunnel header. */ | |
555 | skb = gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM)); | |
556 | if (IS_ERR(skb)) { | |
557 | skb = NULL; | |
558 | goto err_free_rt; | |
559 | } | |
560 | ||
561 | flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); | |
562 | build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB), | |
563 | tunnel_id_to_key(tun_info->key.tun_id), 0); | |
564 | ||
565 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
566 | err = iptunnel_xmit(skb->sk, rt, skb, fl.saddr, | |
567 | key->ipv4_dst, IPPROTO_GRE, | |
568 | key->ipv4_tos, key->ipv4_ttl, df, false); | |
569 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); | |
570 | return; | |
571 | ||
572 | err_free_rt: | |
573 | ip_rt_put(rt); | |
574 | err_free_skb: | |
575 | kfree_skb(skb); | |
576 | dev->stats.tx_dropped++; | |
577 | } | |
578 | ||
c5441932 PS |
579 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
580 | struct net_device *dev) | |
581 | { | |
582 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
583 | const struct iphdr *tnl_params; | |
1da177e4 | 584 | |
2e15ea39 PS |
585 | if (tunnel->collect_md) { |
586 | gre_fb_xmit(skb, dev); | |
587 | return NETDEV_TX_OK; | |
588 | } | |
589 | ||
c5441932 PS |
590 | if (dev->header_ops) { |
591 | /* Need space for new headers */ | |
592 | if (skb_cow_head(skb, dev->needed_headroom - | |
2bac7cb3 | 593 | (tunnel->hlen + sizeof(struct iphdr)))) |
c5441932 | 594 | goto free_skb; |
1da177e4 | 595 | |
c5441932 | 596 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 597 | |
c5441932 PS |
598 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
599 | * to gre header. | |
600 | */ | |
601 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); | |
8a0033a9 | 602 | skb_reset_mac_header(skb); |
c5441932 PS |
603 | } else { |
604 | if (skb_cow_head(skb, dev->needed_headroom)) | |
605 | goto free_skb; | |
1da177e4 | 606 | |
c5441932 | 607 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
608 | } |
609 | ||
8a0033a9 TT |
610 | skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); |
611 | if (IS_ERR(skb)) | |
612 | goto out; | |
613 | ||
c5441932 | 614 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
6ed10654 | 615 | return NETDEV_TX_OK; |
1da177e4 | 616 | |
c5441932 | 617 | free_skb: |
3acfa1e7 | 618 | kfree_skb(skb); |
c5441932 PS |
619 | out: |
620 | dev->stats.tx_dropped++; | |
6ed10654 | 621 | return NETDEV_TX_OK; |
1da177e4 LT |
622 | } |
623 | ||
c5441932 PS |
624 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
625 | struct net_device *dev) | |
ee34c1eb | 626 | { |
c5441932 | 627 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 628 | |
2e15ea39 PS |
629 | if (tunnel->collect_md) { |
630 | gre_fb_xmit(skb, dev); | |
631 | return NETDEV_TX_OK; | |
632 | } | |
633 | ||
45f2e997 | 634 | skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); |
c5441932 PS |
635 | if (IS_ERR(skb)) |
636 | goto out; | |
ee34c1eb | 637 | |
c5441932 PS |
638 | if (skb_cow_head(skb, dev->needed_headroom)) |
639 | goto free_skb; | |
42aa9162 | 640 | |
c5441932 | 641 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
c5441932 | 642 | return NETDEV_TX_OK; |
ee34c1eb | 643 | |
c5441932 | 644 | free_skb: |
3acfa1e7 | 645 | kfree_skb(skb); |
c5441932 PS |
646 | out: |
647 | dev->stats.tx_dropped++; | |
648 | return NETDEV_TX_OK; | |
ee34c1eb MS |
649 | } |
650 | ||
c5441932 PS |
651 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
652 | struct ifreq *ifr, int cmd) | |
1da177e4 | 653 | { |
4565e991 | 654 | int err; |
1da177e4 | 655 | struct ip_tunnel_parm p; |
1da177e4 | 656 | |
c5441932 PS |
657 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
658 | return -EFAULT; | |
6c734fb8 CW |
659 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
660 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
661 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
662 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
663 | return -EINVAL; | |
1da177e4 | 664 | } |
c5441932 PS |
665 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
666 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); | |
1da177e4 | 667 | |
c5441932 PS |
668 | err = ip_tunnel_ioctl(dev, &p, cmd); |
669 | if (err) | |
670 | return err; | |
1da177e4 | 671 | |
c5441932 PS |
672 | p.i_flags = tnl_flags_to_gre_flags(p.i_flags); |
673 | p.o_flags = tnl_flags_to_gre_flags(p.o_flags); | |
674 | ||
675 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
676 | return -EFAULT; | |
1da177e4 LT |
677 | return 0; |
678 | } | |
679 | ||
1da177e4 LT |
680 | /* Nice toy. Unfortunately, useless in real life :-) |
681 | It allows to construct virtual multiprotocol broadcast "LAN" | |
682 | over the Internet, provided multicast routing is tuned. | |
683 | ||
684 | ||
685 | I have no idea was this bicycle invented before me, | |
686 | so that I had to set ARPHRD_IPGRE to a random value. | |
687 | I have an impression, that Cisco could make something similar, | |
688 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 689 | |
1da177e4 LT |
690 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
691 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
692 | ||
693 | ping -t 255 224.66.66.66 | |
694 | ||
695 | If nobody answers, mbone does not work. | |
696 | ||
697 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
698 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
699 | ifconfig Universe up | |
700 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
701 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
702 | ftp 10.66.66.66 | |
703 | ... | |
704 | ftp fec0:6666:6666::193.233.7.65 | |
705 | ... | |
1da177e4 | 706 | */ |
3b04ddde SH |
707 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
708 | unsigned short type, | |
1507850b | 709 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 710 | { |
2941a486 | 711 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
712 | struct iphdr *iph; |
713 | struct gre_base_hdr *greh; | |
1da177e4 | 714 | |
c5441932 PS |
715 | iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph)); |
716 | greh = (struct gre_base_hdr *)(iph+1); | |
717 | greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags); | |
718 | greh->protocol = htons(type); | |
1da177e4 | 719 | |
c5441932 | 720 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 721 | |
c5441932 | 722 | /* Set the source hardware address. */ |
1da177e4 LT |
723 | if (saddr) |
724 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 725 | if (daddr) |
1da177e4 | 726 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 727 | if (iph->daddr) |
77a482bd | 728 | return t->hlen + sizeof(*iph); |
e905a9ed | 729 | |
c5441932 | 730 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
731 | } |
732 | ||
6a5f44d7 TT |
733 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
734 | { | |
b71d1d42 | 735 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
736 | memcpy(haddr, &iph->saddr, 4); |
737 | return 4; | |
738 | } | |
739 | ||
3b04ddde SH |
740 | static const struct header_ops ipgre_header_ops = { |
741 | .create = ipgre_header, | |
6a5f44d7 | 742 | .parse = ipgre_header_parse, |
3b04ddde SH |
743 | }; |
744 | ||
6a5f44d7 | 745 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
746 | static int ipgre_open(struct net_device *dev) |
747 | { | |
2941a486 | 748 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 749 | |
f97c1e0c | 750 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
751 | struct flowi4 fl4; |
752 | struct rtable *rt; | |
753 | ||
b57708ad | 754 | rt = ip_route_output_gre(t->net, &fl4, |
cbb1e85f DM |
755 | t->parms.iph.daddr, |
756 | t->parms.iph.saddr, | |
757 | t->parms.o_key, | |
758 | RT_TOS(t->parms.iph.tos), | |
759 | t->parms.link); | |
b23dd4fe | 760 | if (IS_ERR(rt)) |
1da177e4 | 761 | return -EADDRNOTAVAIL; |
d8d1f30b | 762 | dev = rt->dst.dev; |
1da177e4 | 763 | ip_rt_put(rt); |
51456b29 | 764 | if (!__in_dev_get_rtnl(dev)) |
1da177e4 LT |
765 | return -EADDRNOTAVAIL; |
766 | t->mlink = dev->ifindex; | |
e5ed6399 | 767 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
768 | } |
769 | return 0; | |
770 | } | |
771 | ||
772 | static int ipgre_close(struct net_device *dev) | |
773 | { | |
2941a486 | 774 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 775 | |
f97c1e0c | 776 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 777 | struct in_device *in_dev; |
b57708ad | 778 | in_dev = inetdev_by_index(t->net, t->mlink); |
8723e1b4 | 779 | if (in_dev) |
1da177e4 | 780 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
781 | } |
782 | return 0; | |
783 | } | |
1da177e4 LT |
784 | #endif |
785 | ||
b8c26a33 SH |
786 | static const struct net_device_ops ipgre_netdev_ops = { |
787 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 788 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
789 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
790 | .ndo_open = ipgre_open, | |
791 | .ndo_stop = ipgre_close, | |
792 | #endif | |
c5441932 | 793 | .ndo_start_xmit = ipgre_xmit, |
b8c26a33 | 794 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
c5441932 PS |
795 | .ndo_change_mtu = ip_tunnel_change_mtu, |
796 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 797 | .ndo_get_iflink = ip_tunnel_get_iflink, |
b8c26a33 SH |
798 | }; |
799 | ||
6b78f16e ED |
800 | #define GRE_FEATURES (NETIF_F_SG | \ |
801 | NETIF_F_FRAGLIST | \ | |
802 | NETIF_F_HIGHDMA | \ | |
803 | NETIF_F_HW_CSUM) | |
804 | ||
1da177e4 LT |
805 | static void ipgre_tunnel_setup(struct net_device *dev) |
806 | { | |
b8c26a33 | 807 | dev->netdev_ops = &ipgre_netdev_ops; |
5a455275 | 808 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
809 | ip_tunnel_setup(dev, ipgre_net_id); |
810 | } | |
1da177e4 | 811 | |
c5441932 PS |
812 | static void __gre_tunnel_init(struct net_device *dev) |
813 | { | |
814 | struct ip_tunnel *tunnel; | |
4565e991 | 815 | int t_hlen; |
c5441932 PS |
816 | |
817 | tunnel = netdev_priv(dev); | |
4565e991 | 818 | tunnel->tun_hlen = ip_gre_calc_hlen(tunnel->parms.o_flags); |
c5441932 PS |
819 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
820 | ||
4565e991 TH |
821 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
822 | ||
823 | t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
824 | ||
825 | dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; | |
826 | dev->mtu = ETH_DATA_LEN - t_hlen - 4; | |
6b78f16e | 827 | |
b57708ad | 828 | dev->features |= GRE_FEATURES; |
6b78f16e | 829 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
830 | |
831 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
832 | /* TCP offload with GRE SEQ is not supported. */ | |
833 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
834 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
835 | /* Can use a lockless transmit, unless we generate | |
836 | * output sequences | |
837 | */ | |
838 | dev->features |= NETIF_F_LLTX; | |
839 | } | |
1da177e4 LT |
840 | } |
841 | ||
842 | static int ipgre_tunnel_init(struct net_device *dev) | |
843 | { | |
c5441932 PS |
844 | struct ip_tunnel *tunnel = netdev_priv(dev); |
845 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 846 | |
c5441932 | 847 | __gre_tunnel_init(dev); |
1da177e4 | 848 | |
c5441932 PS |
849 | memcpy(dev->dev_addr, &iph->saddr, 4); |
850 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 851 | |
c5441932 | 852 | dev->flags = IFF_NOARP; |
02875878 | 853 | netif_keep_dst(dev); |
c5441932 | 854 | dev->addr_len = 4; |
1da177e4 | 855 | |
1da177e4 | 856 | if (iph->daddr) { |
1da177e4 | 857 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 858 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
859 | if (!iph->saddr) |
860 | return -EINVAL; | |
861 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 862 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
863 | } |
864 | #endif | |
ee34c1eb | 865 | } else |
6a5f44d7 | 866 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 867 | |
c5441932 | 868 | return ip_tunnel_init(dev); |
1da177e4 LT |
869 | } |
870 | ||
9f57c67c PS |
871 | static const struct gre_protocol ipgre_protocol = { |
872 | .handler = gre_rcv, | |
873 | .err_handler = gre_err, | |
1da177e4 LT |
874 | }; |
875 | ||
2c8c1e72 | 876 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 877 | { |
c5441932 | 878 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
879 | } |
880 | ||
2c8c1e72 | 881 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 | 882 | { |
c5441932 | 883 | struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id); |
6c742e71 | 884 | ip_tunnel_delete_net(itn, &ipgre_link_ops); |
59a4c759 PE |
885 | } |
886 | ||
887 | static struct pernet_operations ipgre_net_ops = { | |
888 | .init = ipgre_init_net, | |
889 | .exit = ipgre_exit_net, | |
cfb8fbf2 | 890 | .id = &ipgre_net_id, |
c5441932 | 891 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 892 | }; |
1da177e4 | 893 | |
c19e654d HX |
894 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
895 | { | |
896 | __be16 flags; | |
897 | ||
898 | if (!data) | |
899 | return 0; | |
900 | ||
901 | flags = 0; | |
902 | if (data[IFLA_GRE_IFLAGS]) | |
903 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
904 | if (data[IFLA_GRE_OFLAGS]) | |
905 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
906 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
907 | return -EINVAL; | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
e1a80002 HX |
912 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
913 | { | |
914 | __be32 daddr; | |
915 | ||
916 | if (tb[IFLA_ADDRESS]) { | |
917 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
918 | return -EINVAL; | |
919 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
920 | return -EADDRNOTAVAIL; | |
921 | } | |
922 | ||
923 | if (!data) | |
924 | goto out; | |
925 | ||
926 | if (data[IFLA_GRE_REMOTE]) { | |
927 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
928 | if (!daddr) | |
929 | return -EINVAL; | |
930 | } | |
931 | ||
932 | out: | |
933 | return ipgre_tunnel_validate(tb, data); | |
934 | } | |
935 | ||
2e15ea39 PS |
936 | static void ipgre_netlink_parms(struct net_device *dev, |
937 | struct nlattr *data[], | |
938 | struct nlattr *tb[], | |
939 | struct ip_tunnel_parm *parms) | |
c19e654d | 940 | { |
7bb82d92 | 941 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
942 | |
943 | parms->iph.protocol = IPPROTO_GRE; | |
944 | ||
945 | if (!data) | |
946 | return; | |
947 | ||
948 | if (data[IFLA_GRE_LINK]) | |
949 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
950 | ||
951 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 952 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
953 | |
954 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 955 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
956 | |
957 | if (data[IFLA_GRE_IKEY]) | |
958 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
959 | ||
960 | if (data[IFLA_GRE_OKEY]) | |
961 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
962 | ||
963 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 964 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
965 | |
966 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 967 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
968 | |
969 | if (data[IFLA_GRE_TTL]) | |
970 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
971 | ||
972 | if (data[IFLA_GRE_TOS]) | |
973 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
974 | ||
975 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
976 | parms->iph.frag_off = htons(IP_DF); | |
2e15ea39 PS |
977 | |
978 | if (data[IFLA_GRE_COLLECT_METADATA]) { | |
979 | struct ip_tunnel *t = netdev_priv(dev); | |
980 | ||
981 | t->collect_md = true; | |
982 | } | |
c19e654d HX |
983 | } |
984 | ||
4565e991 TH |
985 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
986 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], | |
987 | struct ip_tunnel_encap *ipencap) | |
988 | { | |
989 | bool ret = false; | |
990 | ||
991 | memset(ipencap, 0, sizeof(*ipencap)); | |
992 | ||
993 | if (!data) | |
994 | return ret; | |
995 | ||
996 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
997 | ret = true; | |
998 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
999 | } | |
1000 | ||
1001 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
1002 | ret = true; | |
1003 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
1004 | } | |
1005 | ||
1006 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
1007 | ret = true; | |
3e97fa70 | 1008 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
4565e991 TH |
1009 | } |
1010 | ||
1011 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
1012 | ret = true; | |
3e97fa70 | 1013 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
4565e991 TH |
1014 | } |
1015 | ||
1016 | return ret; | |
1017 | } | |
1018 | ||
c5441932 | 1019 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 1020 | { |
c5441932 | 1021 | __gre_tunnel_init(dev); |
bec94d43 | 1022 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
e1a80002 | 1023 | |
c5441932 | 1024 | return ip_tunnel_init(dev); |
e1a80002 HX |
1025 | } |
1026 | ||
c5441932 PS |
1027 | static const struct net_device_ops gre_tap_netdev_ops = { |
1028 | .ndo_init = gre_tap_init, | |
1029 | .ndo_uninit = ip_tunnel_uninit, | |
1030 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
1031 | .ndo_set_mac_address = eth_mac_addr, |
1032 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 PS |
1033 | .ndo_change_mtu = ip_tunnel_change_mtu, |
1034 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1e99584b | 1035 | .ndo_get_iflink = ip_tunnel_get_iflink, |
b8c26a33 SH |
1036 | }; |
1037 | ||
e1a80002 HX |
1038 | static void ipgre_tap_setup(struct net_device *dev) |
1039 | { | |
e1a80002 | 1040 | ether_setup(dev); |
c5441932 | 1041 | dev->netdev_ops = &gre_tap_netdev_ops; |
f8c1b7ce | 1042 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
c5441932 | 1043 | ip_tunnel_setup(dev, gre_tap_net_id); |
e1a80002 HX |
1044 | } |
1045 | ||
c5441932 PS |
1046 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
1047 | struct nlattr *tb[], struct nlattr *data[]) | |
c19e654d | 1048 | { |
c5441932 | 1049 | struct ip_tunnel_parm p; |
4565e991 TH |
1050 | struct ip_tunnel_encap ipencap; |
1051 | ||
1052 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1053 | struct ip_tunnel *t = netdev_priv(dev); | |
1054 | int err = ip_tunnel_encap_setup(t, &ipencap); | |
1055 | ||
1056 | if (err < 0) | |
1057 | return err; | |
1058 | } | |
c19e654d | 1059 | |
2e15ea39 | 1060 | ipgre_netlink_parms(dev, data, tb, &p); |
c5441932 | 1061 | return ip_tunnel_newlink(dev, tb, &p); |
c19e654d HX |
1062 | } |
1063 | ||
1064 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1065 | struct nlattr *data[]) | |
1066 | { | |
c19e654d | 1067 | struct ip_tunnel_parm p; |
4565e991 TH |
1068 | struct ip_tunnel_encap ipencap; |
1069 | ||
1070 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1071 | struct ip_tunnel *t = netdev_priv(dev); | |
1072 | int err = ip_tunnel_encap_setup(t, &ipencap); | |
1073 | ||
1074 | if (err < 0) | |
1075 | return err; | |
1076 | } | |
c19e654d | 1077 | |
2e15ea39 | 1078 | ipgre_netlink_parms(dev, data, tb, &p); |
c5441932 | 1079 | return ip_tunnel_changelink(dev, tb, &p); |
c19e654d HX |
1080 | } |
1081 | ||
1082 | static size_t ipgre_get_size(const struct net_device *dev) | |
1083 | { | |
1084 | return | |
1085 | /* IFLA_GRE_LINK */ | |
1086 | nla_total_size(4) + | |
1087 | /* IFLA_GRE_IFLAGS */ | |
1088 | nla_total_size(2) + | |
1089 | /* IFLA_GRE_OFLAGS */ | |
1090 | nla_total_size(2) + | |
1091 | /* IFLA_GRE_IKEY */ | |
1092 | nla_total_size(4) + | |
1093 | /* IFLA_GRE_OKEY */ | |
1094 | nla_total_size(4) + | |
1095 | /* IFLA_GRE_LOCAL */ | |
1096 | nla_total_size(4) + | |
1097 | /* IFLA_GRE_REMOTE */ | |
1098 | nla_total_size(4) + | |
1099 | /* IFLA_GRE_TTL */ | |
1100 | nla_total_size(1) + | |
1101 | /* IFLA_GRE_TOS */ | |
1102 | nla_total_size(1) + | |
1103 | /* IFLA_GRE_PMTUDISC */ | |
1104 | nla_total_size(1) + | |
4565e991 TH |
1105 | /* IFLA_GRE_ENCAP_TYPE */ |
1106 | nla_total_size(2) + | |
1107 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1108 | nla_total_size(2) + | |
1109 | /* IFLA_GRE_ENCAP_SPORT */ | |
1110 | nla_total_size(2) + | |
1111 | /* IFLA_GRE_ENCAP_DPORT */ | |
1112 | nla_total_size(2) + | |
2e15ea39 PS |
1113 | /* IFLA_GRE_COLLECT_METADATA */ |
1114 | nla_total_size(0) + | |
c19e654d HX |
1115 | 0; |
1116 | } | |
1117 | ||
1118 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1119 | { | |
1120 | struct ip_tunnel *t = netdev_priv(dev); | |
1121 | struct ip_tunnel_parm *p = &t->parms; | |
1122 | ||
f3756b79 | 1123 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
c5441932 PS |
1124 | nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) || |
1125 | nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) || | |
f3756b79 DM |
1126 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1127 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1128 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
1129 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
f3756b79 DM |
1130 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
1131 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1132 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
1133 | !!(p->iph.frag_off & htons(IP_DF)))) | |
1134 | goto nla_put_failure; | |
4565e991 TH |
1135 | |
1136 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1137 | t->encap.type) || | |
3e97fa70 SD |
1138 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
1139 | t->encap.sport) || | |
1140 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1141 | t->encap.dport) || | |
4565e991 | 1142 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
e1b2cb65 | 1143 | t->encap.flags)) |
4565e991 TH |
1144 | goto nla_put_failure; |
1145 | ||
2e15ea39 PS |
1146 | if (t->collect_md) { |
1147 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) | |
1148 | goto nla_put_failure; | |
1149 | } | |
1150 | ||
c19e654d HX |
1151 | return 0; |
1152 | ||
1153 | nla_put_failure: | |
1154 | return -EMSGSIZE; | |
1155 | } | |
1156 | ||
1157 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1158 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1159 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1160 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1161 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1162 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1163 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1164 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1165 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1166 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1167 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
4565e991 TH |
1168 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1169 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1170 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1171 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2e15ea39 | 1172 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
c19e654d HX |
1173 | }; |
1174 | ||
1175 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1176 | .kind = "gre", | |
1177 | .maxtype = IFLA_GRE_MAX, | |
1178 | .policy = ipgre_policy, | |
1179 | .priv_size = sizeof(struct ip_tunnel), | |
1180 | .setup = ipgre_tunnel_setup, | |
1181 | .validate = ipgre_tunnel_validate, | |
1182 | .newlink = ipgre_newlink, | |
1183 | .changelink = ipgre_changelink, | |
c5441932 | 1184 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
1185 | .get_size = ipgre_get_size, |
1186 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1187 | .get_link_net = ip_tunnel_get_link_net, |
c19e654d HX |
1188 | }; |
1189 | ||
e1a80002 HX |
1190 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1191 | .kind = "gretap", | |
1192 | .maxtype = IFLA_GRE_MAX, | |
1193 | .policy = ipgre_policy, | |
1194 | .priv_size = sizeof(struct ip_tunnel), | |
1195 | .setup = ipgre_tap_setup, | |
1196 | .validate = ipgre_tap_validate, | |
1197 | .newlink = ipgre_newlink, | |
1198 | .changelink = ipgre_changelink, | |
c5441932 | 1199 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
1200 | .get_size = ipgre_get_size, |
1201 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1202 | .get_link_net = ip_tunnel_get_link_net, |
e1a80002 HX |
1203 | }; |
1204 | ||
b2acd1dc PS |
1205 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1206 | u8 name_assign_type) | |
1207 | { | |
1208 | struct nlattr *tb[IFLA_MAX + 1]; | |
1209 | struct net_device *dev; | |
1210 | struct ip_tunnel *t; | |
1211 | int err; | |
1212 | ||
1213 | memset(&tb, 0, sizeof(tb)); | |
1214 | ||
1215 | dev = rtnl_create_link(net, name, name_assign_type, | |
1216 | &ipgre_tap_ops, tb); | |
1217 | if (IS_ERR(dev)) | |
1218 | return dev; | |
1219 | ||
1220 | /* Configure flow based GRE device. */ | |
1221 | t = netdev_priv(dev); | |
1222 | t->collect_md = true; | |
1223 | ||
1224 | err = ipgre_newlink(net, dev, tb, NULL); | |
1225 | if (err < 0) | |
1226 | goto out; | |
1227 | return dev; | |
1228 | out: | |
1229 | free_netdev(dev); | |
1230 | return ERR_PTR(err); | |
1231 | } | |
1232 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); | |
1233 | ||
c5441932 PS |
1234 | static int __net_init ipgre_tap_init_net(struct net *net) |
1235 | { | |
2e15ea39 | 1236 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
c5441932 PS |
1237 | } |
1238 | ||
1239 | static void __net_exit ipgre_tap_exit_net(struct net *net) | |
1240 | { | |
1241 | struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id); | |
6c742e71 | 1242 | ip_tunnel_delete_net(itn, &ipgre_tap_ops); |
c5441932 PS |
1243 | } |
1244 | ||
1245 | static struct pernet_operations ipgre_tap_net_ops = { | |
1246 | .init = ipgre_tap_init_net, | |
1247 | .exit = ipgre_tap_exit_net, | |
1248 | .id = &gre_tap_net_id, | |
1249 | .size = sizeof(struct ip_tunnel_net), | |
1250 | }; | |
1da177e4 LT |
1251 | |
1252 | static int __init ipgre_init(void) | |
1253 | { | |
1254 | int err; | |
1255 | ||
058bd4d2 | 1256 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1257 | |
cfb8fbf2 | 1258 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1259 | if (err < 0) |
c2892f02 AD |
1260 | return err; |
1261 | ||
c5441932 PS |
1262 | err = register_pernet_device(&ipgre_tap_net_ops); |
1263 | if (err < 0) | |
1264 | goto pnet_tap_faied; | |
1265 | ||
9f57c67c | 1266 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1267 | if (err < 0) { |
058bd4d2 | 1268 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1269 | goto add_proto_failed; |
1270 | } | |
7daa0004 | 1271 | |
c19e654d HX |
1272 | err = rtnl_link_register(&ipgre_link_ops); |
1273 | if (err < 0) | |
1274 | goto rtnl_link_failed; | |
1275 | ||
e1a80002 HX |
1276 | err = rtnl_link_register(&ipgre_tap_ops); |
1277 | if (err < 0) | |
1278 | goto tap_ops_failed; | |
1279 | ||
c5441932 | 1280 | return 0; |
c19e654d | 1281 | |
e1a80002 HX |
1282 | tap_ops_failed: |
1283 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1284 | rtnl_link_failed: |
9f57c67c | 1285 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1286 | add_proto_failed: |
c5441932 PS |
1287 | unregister_pernet_device(&ipgre_tap_net_ops); |
1288 | pnet_tap_faied: | |
c2892f02 | 1289 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1290 | return err; |
1da177e4 LT |
1291 | } |
1292 | ||
db44575f | 1293 | static void __exit ipgre_fini(void) |
1da177e4 | 1294 | { |
e1a80002 | 1295 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1296 | rtnl_link_unregister(&ipgre_link_ops); |
9f57c67c | 1297 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c5441932 | 1298 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1299 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | module_init(ipgre_init); | |
1303 | module_exit(ipgre_fini); | |
1304 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1305 | MODULE_ALIAS_RTNL_LINK("gre"); |
1306 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1307 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1308 | MODULE_ALIAS_NETDEV("gretap0"); |