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tcp: __tcp_hdrlen() helper
[deliverable/linux.git] / net / ipv4 / ip_gre.c
CommitLineData
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>
2e15ea39 27#include <linux/if_vlan.h>
1da177e4
LT		 28#include <linux/init.h>
29#include <linux/in6.h>
30#include <linux/inetdevice.h>
31#include <linux/igmp.h>
32#include <linux/netfilter_ipv4.h>
e1a80002 33#include <linux/etherdevice.h>
46f25dff 34#include <linux/if_ether.h>
1da177e4
LT		 35
36#include <net/sock.h>
37#include <net/ip.h>
38#include <net/icmp.h>
39#include <net/protocol.h>
c5441932 40#include <net/ip_tunnels.h>
1da177e4
LT		 41#include <net/arp.h>
42#include <net/checksum.h>
43#include <net/dsfield.h>
44#include <net/inet_ecn.h>
45#include <net/xfrm.h>
59a4c759
PE		 46#include <net/net_namespace.h>
47#include <net/netns/generic.h>
c19e654d 48#include <net/rtnetlink.h>
00959ade 49#include <net/gre.h>
2e15ea39 50#include <net/dst_metadata.h>
1da177e4 51
dfd56b8b 52#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#endif
57
58/*
59 Problems & solutions
60 --------------------
61
62 1. The most important issue is detecting local dead loops.
63 They would cause complete host lockup in transmit, which
64 would be "resolved" by stack overflow or, if queueing is enabled,
65 with infinite looping in net_bh.
66
67 We cannot track such dead loops during route installation,
68 it is infeasible task. The most general solutions would be
69 to keep skb->encapsulation counter (sort of local ttl),
6d0722a2 70 and silently drop packet when it expires. It is a good
bff52857 71 solution, but it supposes maintaining new variable in ALL
1da177e4
LT		 72 skb, even if no tunneling is used.
73
6d0722a2
ED		 74 Current solution: xmit_recursion breaks dead loops. This is a percpu
75 counter, since when we enter the first ndo_xmit(), cpu migration is
76 forbidden. We force an exit if this counter reaches RECURSION_LIMIT
1da177e4
LT		 77
78 2. Networking dead loops would not kill routers, but would really
79 kill network. IP hop limit plays role of "t->recursion" in this case,
80 if we copy it from packet being encapsulated to upper header.
81 It is very good solution, but it introduces two problems:
82
83 - Routing protocols, using packets with ttl=1 (OSPF, RIP2),
84 do not work over tunnels.
85 - traceroute does not work. I planned to relay ICMP from tunnel,
86 so that this problem would be solved and traceroute output
87 would even more informative. This idea appeared to be wrong:
88 only Linux complies to rfc1812 now (yes, guys, Linux is the only
89 true router now :-)), all routers (at least, in neighbourhood of mine)
90 return only 8 bytes of payload. It is the end.
91
92 Hence, if we want that OSPF worked or traceroute said something reasonable,
93 we should search for another solution.
94
95 One of them is to parse packet trying to detect inner encapsulation
96 made by our node. It is difficult or even impossible, especially,
bff52857 97 taking into account fragmentation. TO be short, ttl is not solution at all.
1da177e4
LT		 98
99 Current solution: The solution was UNEXPECTEDLY SIMPLE.
100 We force DF flag on tunnels with preconfigured hop limit,
101 that is ALL. :-) Well, it does not remove the problem completely,
102 but exponential growth of network traffic is changed to linear
103 (branches, that exceed pmtu are pruned) and tunnel mtu
bff52857 104 rapidly degrades to value <68, where looping stops.
1da177e4
LT		 105 Yes, it is not good if there exists a router in the loop,
106 which does not force DF, even when encapsulating packets have DF set.
107 But it is not our problem! Nobody could accuse us, we made
108 all that we could make. Even if it is your gated who injected
109 fatal route to network, even if it were you who configured
110 fatal static route: you are innocent. :-)
111
1da177e4
LT		 112 Alexey Kuznetsov.
113 */
114
eccc1bb8 115static bool log_ecn_error = true;
116module_param(log_ecn_error, bool, 0644);
117MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
118
c19e654d 119static struct rtnl_link_ops ipgre_link_ops __read_mostly;
1da177e4 120static int ipgre_tunnel_init(struct net_device *dev);
eb8ce741 121
f99189b1 122static int ipgre_net_id __read_mostly;
c5441932 123static int gre_tap_net_id __read_mostly;
1da177e4 124
9f57c67c
PS		 125static int ip_gre_calc_hlen(__be16 o_flags)
126{
127 int addend = 4;
128
129 if (o_flags & TUNNEL_CSUM)
130 addend += 4;
131 if (o_flags & TUNNEL_KEY)
132 addend += 4;
133 if (o_flags & TUNNEL_SEQ)
134 addend += 4;
135 return addend;
136}
137
138static __be16 gre_flags_to_tnl_flags(__be16 flags)
139{
140 __be16 tflags = 0;
141
142 if (flags & GRE_CSUM)
143 tflags |= TUNNEL_CSUM;
144 if (flags & GRE_ROUTING)
145 tflags |= TUNNEL_ROUTING;
146 if (flags & GRE_KEY)
147 tflags |= TUNNEL_KEY;
148 if (flags & GRE_SEQ)
149 tflags |= TUNNEL_SEQ;
150 if (flags & GRE_STRICT)
151 tflags |= TUNNEL_STRICT;
152 if (flags & GRE_REC)
153 tflags |= TUNNEL_REC;
154 if (flags & GRE_VERSION)
155 tflags |= TUNNEL_VERSION;
156
157 return tflags;
158}
159
160static __be16 tnl_flags_to_gre_flags(__be16 tflags)
161{
162 __be16 flags = 0;
163
164 if (tflags & TUNNEL_CSUM)
165 flags |= GRE_CSUM;
166 if (tflags & TUNNEL_ROUTING)
167 flags |= GRE_ROUTING;
168 if (tflags & TUNNEL_KEY)
169 flags |= GRE_KEY;
170 if (tflags & TUNNEL_SEQ)
171 flags |= GRE_SEQ;
172 if (tflags & TUNNEL_STRICT)
173 flags |= GRE_STRICT;
174 if (tflags & TUNNEL_REC)
175 flags |= GRE_REC;
176 if (tflags & TUNNEL_VERSION)
177 flags |= GRE_VERSION;
178
179 return flags;
180}
181
182static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
183 bool *csum_err)
184{
185 const struct gre_base_hdr *greh;
186 __be32 *options;
187 int hdr_len;
188
189 if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr))))
190 return -EINVAL;
191
192 greh = (struct gre_base_hdr *)skb_transport_header(skb);
193 if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
194 return -EINVAL;
195
196 tpi->flags = gre_flags_to_tnl_flags(greh->flags);
197 hdr_len = ip_gre_calc_hlen(tpi->flags);
198
199 if (!pskb_may_pull(skb, hdr_len))
200 return -EINVAL;
201
202 greh = (struct gre_base_hdr *)skb_transport_header(skb);
203 tpi->proto = greh->protocol;
204
205 options = (__be32 *)(greh + 1);
206 if (greh->flags & GRE_CSUM) {
207 if (skb_checksum_simple_validate(skb)) {
208 *csum_err = true;
209 return -EINVAL;
210 }
211
212 skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
213 null_compute_pseudo);
214 options++;
215 }
216
217 if (greh->flags & GRE_KEY) {
218 tpi->key = *options;
219 options++;
220 } else {
221 tpi->key = 0;
222 }
223 if (unlikely(greh->flags & GRE_SEQ)) {
224 tpi->seq = *options;
225 options++;
226 } else {
227 tpi->seq = 0;
228 }
229 /* WCCP version 1 and 2 protocol decoding.
230 * - Change protocol to IP
231 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
232 */
233 if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
234 tpi->proto = htons(ETH_P_IP);
235 if ((*(u8 *)options & 0xF0) != 0x40) {
236 hdr_len += 4;
237 if (!pskb_may_pull(skb, hdr_len))
238 return -EINVAL;
239 }
240 }
241 return iptunnel_pull_header(skb, hdr_len, tpi->proto);
242}
243
244static void ipgre_err(struct sk_buff *skb, u32 info,
245 const struct tnl_ptk_info *tpi)
1da177e4 246{
1da177e4 247
c5441932
PS		 248 /* All the routers (except for Linux) return only
249 8 bytes of packet payload. It means, that precise relaying of
250 ICMP in the real Internet is absolutely infeasible.
1da177e4 251
c5441932
PS		 252 Moreover, Cisco "wise men" put GRE key to the third word
253 in GRE header. It makes impossible maintaining even soft
254 state for keyed GRE tunnels with enabled checksum. Tell
255 them "thank you".
1da177e4 256
c5441932
PS		 257 Well, I wonder, rfc1812 was written by Cisco employee,
258 what the hell these idiots break standards established
259 by themselves???
260 */
261 struct net *net = dev_net(skb->dev);
262 struct ip_tunnel_net *itn;
96f5a846 263 const struct iphdr *iph;
88c7664f
ACM		 264 const int type = icmp_hdr(skb)->type;
265 const int code = icmp_hdr(skb)->code;
1da177e4 266 struct ip_tunnel *t;
1da177e4 267
1da177e4
LT		 268 switch (type) {
269 default:
270 case ICMP_PARAMETERPROB:
9f57c67c 271 return;
1da177e4
LT		 272
273 case ICMP_DEST_UNREACH:
274 switch (code) {
275 case ICMP_SR_FAILED:
276 case ICMP_PORT_UNREACH:
277 /* Impossible event. */
9f57c67c 278 return;
1da177e4
LT		 279 default:
280 /* All others are translated to HOST_UNREACH.
281 rfc2003 contains "deep thoughts" about NET_UNREACH,
282 I believe they are just ether pollution. --ANK
283 */
284 break;
285 }
286 break;
9f57c67c 287
1da177e4
LT		 288 case ICMP_TIME_EXCEEDED:
289 if (code != ICMP_EXC_TTL)
9f57c67c 290 return;
1da177e4 291 break;
55be7a9c
DM		 292
293 case ICMP_REDIRECT:
294 break;
1da177e4
LT		 295 }
296
bda7bb46 297 if (tpi->proto == htons(ETH_P_TEB))
c5441932
PS		 298 itn = net_generic(net, gre_tap_net_id);
299 else
300 itn = net_generic(net, ipgre_net_id);
301
c0c0c50f 302 iph = (const struct iphdr *)(icmp_hdr(skb) + 1);
bda7bb46
PS		 303 t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
304 iph->daddr, iph->saddr, tpi->key);
d2083287 305
51456b29 306 if (!t)
9f57c67c 307 return;
36393395 308
36393395 309 if (t->parms.iph.daddr == 0 ||
f97c1e0c 310 ipv4_is_multicast(t->parms.iph.daddr))
9f57c67c 311 return;
1da177e4
LT		 312
313 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
9f57c67c 314 return;
1da177e4 315
da6185d8 316 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
1da177e4
LT		 317 t->err_count++;
318 else
319 t->err_count = 1;
320 t->err_time = jiffies;
9f57c67c
PS		 321}
322
323static void gre_err(struct sk_buff *skb, u32 info)
324{
325 /* All the routers (except for Linux) return only
326 * 8 bytes of packet payload. It means, that precise relaying of
327 * ICMP in the real Internet is absolutely infeasible.
328 *
329 * Moreover, Cisco "wise men" put GRE key to the third word
330 * in GRE header. It makes impossible maintaining even soft
331 * state for keyed
332 * GRE tunnels with enabled checksum. Tell them "thank you".
333 *
334 * Well, I wonder, rfc1812 was written by Cisco employee,
335 * what the hell these idiots break standards established
336 * by themselves???
337 */
338
339 const int type = icmp_hdr(skb)->type;
340 const int code = icmp_hdr(skb)->code;
341 struct tnl_ptk_info tpi;
342 bool csum_err = false;
343
344 if (parse_gre_header(skb, &tpi, &csum_err)) {
345 if (!csum_err) /* ignore csum errors. */
346 return;
347 }
348
349 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
350 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
351 skb->dev->ifindex, 0, IPPROTO_GRE, 0);
352 return;
353 }
354 if (type == ICMP_REDIRECT) {
355 ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0,
356 IPPROTO_GRE, 0);
357 return;
358 }
359
360 ipgre_err(skb, info, &tpi);
1da177e4
LT		 361}
362
2e15ea39
PS		 363static __be64 key_to_tunnel_id(__be32 key)
364{
365#ifdef __BIG_ENDIAN
366 return (__force __be64)((__force u32)key);
367#else
368 return (__force __be64)((__force u64)key << 32);
369#endif
370}
371
372/* Returns the least-significant 32 bits of a __be64. */
373static __be32 tunnel_id_to_key(__be64 x)
374{
375#ifdef __BIG_ENDIAN
376 return (__force __be32)x;
377#else
378 return (__force __be32)((__force u64)x >> 32);
379#endif
380}
381
bda7bb46 382static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
1da177e4 383{
c5441932 384 struct net *net = dev_net(skb->dev);
2e15ea39 385 struct metadata_dst *tun_dst = NULL;
c5441932 386 struct ip_tunnel_net *itn;
b71d1d42 387 const struct iphdr *iph;
1da177e4 388 struct ip_tunnel *tunnel;
1da177e4 389
bda7bb46 390 if (tpi->proto == htons(ETH_P_TEB))
c5441932
PS		 391 itn = net_generic(net, gre_tap_net_id);
392 else
393 itn = net_generic(net, ipgre_net_id);
1da177e4 394
c5441932 395 iph = ip_hdr(skb);
bda7bb46
PS		 396 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
397 iph->saddr, iph->daddr, tpi->key);
e1a80002 398
d2083287 399 if (tunnel) {
0e3da5bb 400 skb_pop_mac_header(skb);
2e15ea39 401 if (tunnel->collect_md) {
c29a70d2
PS		 402 __be16 flags;
403 __be64 tun_id;
2e15ea39 404
c29a70d2
PS		 405 flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
406 tun_id = key_to_tunnel_id(tpi->key);
407 tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0);
2e15ea39
PS		 408 if (!tun_dst)
409 return PACKET_REJECT;
2e15ea39
PS		 410 }
411
412 ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
bda7bb46 413 return PACKET_RCVD;
1da177e4 414 }
bda7bb46 415 return PACKET_REJECT;
1da177e4
LT		 416}
417
9f57c67c
PS		 418static int gre_rcv(struct sk_buff *skb)
419{
420 struct tnl_ptk_info tpi;
421 bool csum_err = false;
422
423#ifdef CONFIG_NET_IPGRE_BROADCAST
424 if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
425 /* Looped back packet, drop it! */
426 if (rt_is_output_route(skb_rtable(skb)))
427 goto drop;
428 }
429#endif
430
431 if (parse_gre_header(skb, &tpi, &csum_err) < 0)
432 goto drop;
433
434 if (ipgre_rcv(skb, &tpi) == PACKET_RCVD)
435 return 0;
436
437 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
438drop:
439 kfree_skb(skb);
440 return 0;
441}
442
2e15ea39
PS		 443static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags,
444 __be16 proto, __be32 key, __be32 seq)
445{
446 struct gre_base_hdr *greh;
447
448 skb_push(skb, hdr_len);
449
450 skb_reset_transport_header(skb);
451 greh = (struct gre_base_hdr *)skb->data;
452 greh->flags = tnl_flags_to_gre_flags(flags);
453 greh->protocol = proto;
454
455 if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
456 __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
457
458 if (flags & TUNNEL_SEQ) {
459 *ptr = seq;
460 ptr--;
461 }
462 if (flags & TUNNEL_KEY) {
463 *ptr = key;
464 ptr--;
465 }
466 if (flags & TUNNEL_CSUM &&
467 !(skb_shinfo(skb)->gso_type &
468 (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
469 *ptr = 0;
470 *(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,
471 skb->len, 0));
472 }
473 }
474}
475
c5441932
PS		 476static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
477 const struct iphdr *tnl_params,
478 __be16 proto)
479{
480 struct ip_tunnel *tunnel = netdev_priv(dev);
1da177e4 481
c5441932
PS		 482 if (tunnel->parms.o_flags & TUNNEL_SEQ)
483 tunnel->o_seqno++;
1da177e4 484
c5441932 485 /* Push GRE header. */
2e15ea39
PS		 486 build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
487 proto, tunnel->parms.o_key, htonl(tunnel->o_seqno));
54bc9bac 488
2e15ea39 489 skb_set_inner_protocol(skb, proto);
bf3d6a8f 490 ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol);
c5441932 491}
1da177e4 492
b2acd1dc
PS		 493static struct sk_buff *gre_handle_offloads(struct sk_buff *skb,
494 bool csum)
495{
496 return iptunnel_handle_offloads(skb, csum,
497 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
498}
499
fc4099f1
PS		 500static struct rtable *gre_get_rt(struct sk_buff *skb,
501 struct net_device *dev,
502 struct flowi4 *fl,
503 const struct ip_tunnel_key *key)
504{
505 struct net *net = dev_net(dev);
506
507 memset(fl, 0, sizeof(*fl));
508 fl->daddr = key->u.ipv4.dst;
509 fl->saddr = key->u.ipv4.src;
510 fl->flowi4_tos = RT_TOS(key->tos);
511 fl->flowi4_mark = skb->mark;
512 fl->flowi4_proto = IPPROTO_GRE;
513
514 return ip_route_output_key(net, fl);
515}
516
2e15ea39
PS		 517static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
518{
519 struct ip_tunnel_info *tun_info;
2e15ea39
PS		 520 const struct ip_tunnel_key *key;
521 struct flowi4 fl;
522 struct rtable *rt;
523 int min_headroom;
524 int tunnel_hlen;
525 __be16 df, flags;
526 int err;
527
61adedf3 528 tun_info = skb_tunnel_info(skb);
7f9562a1
JB		 529 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
530 ip_tunnel_info_af(tun_info) != AF_INET))
2e15ea39
PS		 531 goto err_free_skb;
532
533 key = &tun_info->key;
fc4099f1 534 rt = gre_get_rt(skb, dev, &fl, key);
2e15ea39
PS		 535 if (IS_ERR(rt))
536 goto err_free_skb;
537
538 tunnel_hlen = ip_gre_calc_hlen(key->tun_flags);
539
540 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
541 + tunnel_hlen + sizeof(struct iphdr);
542 if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
543 int head_delta = SKB_DATA_ALIGN(min_headroom -
544 skb_headroom(skb) +
545 16);
546 err = pskb_expand_head(skb, max_t(int, head_delta, 0),
547 0, GFP_ATOMIC);
548 if (unlikely(err))
549 goto err_free_rt;
550 }
551
552 /* Push Tunnel header. */
553 skb = gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM));
554 if (IS_ERR(skb)) {
555 skb = NULL;
556 goto err_free_rt;
557 }
558
559 flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
560 build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB),
561 tunnel_id_to_key(tun_info->key.tun_id), 0);
562
563 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
039f5062
PS		 564
565 iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE,
566 key->tos, key->ttl, df, false);
2e15ea39
PS		 567 return;
568
569err_free_rt:
570 ip_rt_put(rt);
571err_free_skb:
572 kfree_skb(skb);
573 dev->stats.tx_dropped++;
574}
575
fc4099f1
PS		 576static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
577{
578 struct ip_tunnel_info *info = skb_tunnel_info(skb);
579 struct rtable *rt;
580 struct flowi4 fl4;
581
582 if (ip_tunnel_info_af(info) != AF_INET)
583 return -EINVAL;
584
585 rt = gre_get_rt(skb, dev, &fl4, &info->key);
586 if (IS_ERR(rt))
587 return PTR_ERR(rt);
588
589 ip_rt_put(rt);
590 info->key.u.ipv4.src = fl4.saddr;
591 return 0;
592}
593
c5441932
PS		 594static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
595 struct net_device *dev)
596{
597 struct ip_tunnel *tunnel = netdev_priv(dev);
598 const struct iphdr *tnl_params;
1da177e4 599
2e15ea39
PS		 600 if (tunnel->collect_md) {
601 gre_fb_xmit(skb, dev);
602 return NETDEV_TX_OK;
603 }
604
c5441932
PS		 605 if (dev->header_ops) {
606 /* Need space for new headers */
607 if (skb_cow_head(skb, dev->needed_headroom -
2bac7cb3 608 (tunnel->hlen + sizeof(struct iphdr))))
c5441932 609 goto free_skb;
1da177e4 610
c5441932 611 tnl_params = (const struct iphdr *)skb->data;
1da177e4 612
c5441932
PS		 613 /* Pull skb since ip_tunnel_xmit() needs skb->data pointing
614 * to gre header.
615 */
616 skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));
8a0033a9 617 skb_reset_mac_header(skb);
c5441932
PS		 618 } else {
619 if (skb_cow_head(skb, dev->needed_headroom))
620 goto free_skb;
1da177e4 621
c5441932 622 tnl_params = &tunnel->parms.iph;
1da177e4
LT		 623 }
624
8a0033a9
TT		 625 skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
626 if (IS_ERR(skb))
627 goto out;
628
c5441932 629 __gre_xmit(skb, dev, tnl_params, skb->protocol);
6ed10654 630 return NETDEV_TX_OK;
1da177e4 631
c5441932 632free_skb:
3acfa1e7 633 kfree_skb(skb);
c5441932
PS		 634out:
635 dev->stats.tx_dropped++;
6ed10654 636 return NETDEV_TX_OK;
1da177e4
LT		 637}
638
c5441932
PS		 639static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
640 struct net_device *dev)
ee34c1eb 641{
c5441932 642 struct ip_tunnel *tunnel = netdev_priv(dev);
ee34c1eb 643
2e15ea39
PS		 644 if (tunnel->collect_md) {
645 gre_fb_xmit(skb, dev);
646 return NETDEV_TX_OK;
647 }
648
45f2e997 649 skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
c5441932
PS		 650 if (IS_ERR(skb))
651 goto out;
ee34c1eb 652
c5441932
PS		 653 if (skb_cow_head(skb, dev->needed_headroom))
654 goto free_skb;
42aa9162 655
c5441932 656 __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
c5441932 657 return NETDEV_TX_OK;
ee34c1eb 658
c5441932 659free_skb:
3acfa1e7 660 kfree_skb(skb);
c5441932
PS		 661out:
662 dev->stats.tx_dropped++;
663 return NETDEV_TX_OK;
ee34c1eb
MS		 664}
665
c5441932
PS		 666static int ipgre_tunnel_ioctl(struct net_device *dev,
667 struct ifreq *ifr, int cmd)
1da177e4 668{
4565e991 669 int err;
1da177e4 670 struct ip_tunnel_parm p;
1da177e4 671
c5441932
PS		 672 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
673 return -EFAULT;
6c734fb8
CW		 674 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
675 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
676 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
677 ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)))
678 return -EINVAL;
1da177e4 679 }
c5441932
PS		 680 p.i_flags = gre_flags_to_tnl_flags(p.i_flags);
681 p.o_flags = gre_flags_to_tnl_flags(p.o_flags);
1da177e4 682
c5441932
PS		 683 err = ip_tunnel_ioctl(dev, &p, cmd);
684 if (err)
685 return err;
1da177e4 686
c5441932
PS		 687 p.i_flags = tnl_flags_to_gre_flags(p.i_flags);
688 p.o_flags = tnl_flags_to_gre_flags(p.o_flags);
689
690 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
691 return -EFAULT;
1da177e4
LT		 692 return 0;
693}
694
1da177e4
LT		 695/* Nice toy. Unfortunately, useless in real life :-)
696 It allows to construct virtual multiprotocol broadcast "LAN"
697 over the Internet, provided multicast routing is tuned.
698
699
700 I have no idea was this bicycle invented before me,
701 so that I had to set ARPHRD_IPGRE to a random value.
702 I have an impression, that Cisco could make something similar,
703 but this feature is apparently missing in IOS<=11.2(8).
e905a9ed 704
1da177e4
LT		 705 I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks
706 with broadcast 224.66.66.66. If you have access to mbone, play with me :-)
707
708 ping -t 255 224.66.66.66
709
710 If nobody answers, mbone does not work.
711
712 ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255
713 ip addr add 10.66.66.<somewhat>/24 dev Universe
714 ifconfig Universe up
715 ifconfig Universe add fe80::<Your_real_addr>/10
716 ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96
717 ftp 10.66.66.66
718 ...
719 ftp fec0:6666:6666::193.233.7.65
720 ...
1da177e4 721 */
3b04ddde
SH		 722static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
723 unsigned short type,
1507850b 724 const void *daddr, const void *saddr, unsigned int len)
1da177e4 725{
2941a486 726 struct ip_tunnel *t = netdev_priv(dev);
c5441932
PS		 727 struct iphdr *iph;
728 struct gre_base_hdr *greh;
1da177e4 729
c5441932
PS		 730 iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph));
731 greh = (struct gre_base_hdr *)(iph+1);
732 greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags);
733 greh->protocol = htons(type);
1da177e4 734
c5441932 735 memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
e905a9ed 736
c5441932 737 /* Set the source hardware address. */
1da177e4
LT		 738 if (saddr)
739 memcpy(&iph->saddr, saddr, 4);
6d55cb91 740 if (daddr)
1da177e4 741 memcpy(&iph->daddr, daddr, 4);
6d55cb91 742 if (iph->daddr)
77a482bd 743 return t->hlen + sizeof(*iph);
e905a9ed 744
c5441932 745 return -(t->hlen + sizeof(*iph));
1da177e4
LT		 746}
747
6a5f44d7
TT		 748static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
749{
b71d1d42 750 const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb);
6a5f44d7
TT		 751 memcpy(haddr, &iph->saddr, 4);
752 return 4;
753}
754
3b04ddde
SH		 755static const struct header_ops ipgre_header_ops = {
756 .create = ipgre_header,
6a5f44d7 757 .parse = ipgre_header_parse,
3b04ddde
SH		 758};
759
6a5f44d7 760#ifdef CONFIG_NET_IPGRE_BROADCAST
1da177e4
LT		 761static int ipgre_open(struct net_device *dev)
762{
2941a486 763 struct ip_tunnel *t = netdev_priv(dev);
1da177e4 764
f97c1e0c 765 if (ipv4_is_multicast(t->parms.iph.daddr)) {
cbb1e85f
DM		 766 struct flowi4 fl4;
767 struct rtable *rt;
768
b57708ad 769 rt = ip_route_output_gre(t->net, &fl4,
cbb1e85f
DM		 770 t->parms.iph.daddr,
771 t->parms.iph.saddr,
772 t->parms.o_key,
773 RT_TOS(t->parms.iph.tos),
774 t->parms.link);
b23dd4fe 775 if (IS_ERR(rt))
1da177e4 776 return -EADDRNOTAVAIL;
d8d1f30b 777 dev = rt->dst.dev;
1da177e4 778 ip_rt_put(rt);
51456b29 779 if (!__in_dev_get_rtnl(dev))
1da177e4
LT		 780 return -EADDRNOTAVAIL;
781 t->mlink = dev->ifindex;
e5ed6399 782 ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr);
1da177e4
LT		 783 }
784 return 0;
785}
786
787static int ipgre_close(struct net_device *dev)
788{
2941a486 789 struct ip_tunnel *t = netdev_priv(dev);
b8c26a33 790
f97c1e0c 791 if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) {
7fee0ca2 792 struct in_device *in_dev;
b57708ad 793 in_dev = inetdev_by_index(t->net, t->mlink);
8723e1b4 794 if (in_dev)
1da177e4 795 ip_mc_dec_group(in_dev, t->parms.iph.daddr);
1da177e4
LT		 796 }
797 return 0;
798}
1da177e4
LT		 799#endif
800
b8c26a33
SH		 801static const struct net_device_ops ipgre_netdev_ops = {
802 .ndo_init = ipgre_tunnel_init,
c5441932 803 .ndo_uninit = ip_tunnel_uninit,
b8c26a33
SH		 804#ifdef CONFIG_NET_IPGRE_BROADCAST
805 .ndo_open = ipgre_open,
806 .ndo_stop = ipgre_close,
807#endif
c5441932 808 .ndo_start_xmit = ipgre_xmit,
b8c26a33 809 .ndo_do_ioctl = ipgre_tunnel_ioctl,
c5441932
PS		 810 .ndo_change_mtu = ip_tunnel_change_mtu,
811 .ndo_get_stats64 = ip_tunnel_get_stats64,
1e99584b 812 .ndo_get_iflink = ip_tunnel_get_iflink,
b8c26a33
SH		 813};
814
6b78f16e
ED		 815#define GRE_FEATURES (NETIF_F_SG | \
816 NETIF_F_FRAGLIST | \
817 NETIF_F_HIGHDMA | \
818 NETIF_F_HW_CSUM)
819
1da177e4
LT		 820static void ipgre_tunnel_setup(struct net_device *dev)
821{
b8c26a33 822 dev->netdev_ops = &ipgre_netdev_ops;
5a455275 823 dev->type = ARPHRD_IPGRE;
c5441932
PS		 824 ip_tunnel_setup(dev, ipgre_net_id);
825}
1da177e4 826
c5441932
PS		 827static void __gre_tunnel_init(struct net_device *dev)
828{
829 struct ip_tunnel *tunnel;
4565e991 830 int t_hlen;
c5441932
PS		 831
832 tunnel = netdev_priv(dev);
4565e991 833 tunnel->tun_hlen = ip_gre_calc_hlen(tunnel->parms.o_flags);
c5441932
PS		 834 tunnel->parms.iph.protocol = IPPROTO_GRE;
835
4565e991
TH		 836 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
837
838 t_hlen = tunnel->hlen + sizeof(struct iphdr);
839
840 dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;
841 dev->mtu = ETH_DATA_LEN - t_hlen - 4;
6b78f16e 842
b57708ad 843 dev->features |= GRE_FEATURES;
6b78f16e 844 dev->hw_features |= GRE_FEATURES;
c5441932
PS		 845
846 if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
847 /* TCP offload with GRE SEQ is not supported. */
848 dev->features |= NETIF_F_GSO_SOFTWARE;
849 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
850 /* Can use a lockless transmit, unless we generate
851 * output sequences
852 */
853 dev->features |= NETIF_F_LLTX;
854 }
1da177e4
LT		 855}
856
857static int ipgre_tunnel_init(struct net_device *dev)
858{
c5441932
PS		 859 struct ip_tunnel *tunnel = netdev_priv(dev);
860 struct iphdr *iph = &tunnel->parms.iph;
1da177e4 861
c5441932 862 __gre_tunnel_init(dev);
1da177e4 863
c5441932
PS		 864 memcpy(dev->dev_addr, &iph->saddr, 4);
865 memcpy(dev->broadcast, &iph->daddr, 4);
1da177e4 866
c5441932 867 dev->flags = IFF_NOARP;
02875878 868 netif_keep_dst(dev);
c5441932 869 dev->addr_len = 4;
1da177e4 870
1da177e4 871 if (iph->daddr) {
1da177e4 872#ifdef CONFIG_NET_IPGRE_BROADCAST
f97c1e0c 873 if (ipv4_is_multicast(iph->daddr)) {
1da177e4
LT		 874 if (!iph->saddr)
875 return -EINVAL;
876 dev->flags = IFF_BROADCAST;
3b04ddde 877 dev->header_ops = &ipgre_header_ops;
1da177e4
LT		 878 }
879#endif
ee34c1eb 880 } else
6a5f44d7 881 dev->header_ops = &ipgre_header_ops;
1da177e4 882
c5441932 883 return ip_tunnel_init(dev);
1da177e4
LT		 884}
885
9f57c67c
PS		 886static const struct gre_protocol ipgre_protocol = {
887 .handler = gre_rcv,
888 .err_handler = gre_err,
1da177e4
LT		 889};
890
2c8c1e72 891static int __net_init ipgre_init_net(struct net *net)
59a4c759 892{
c5441932 893 return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
59a4c759
PE		 894}
895
2c8c1e72 896static void __net_exit ipgre_exit_net(struct net *net)
59a4c759 897{
c5441932 898 struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
6c742e71 899 ip_tunnel_delete_net(itn, &ipgre_link_ops);
59a4c759
PE		 900}
901
902static struct pernet_operations ipgre_net_ops = {
903 .init = ipgre_init_net,
904 .exit = ipgre_exit_net,
cfb8fbf2 905 .id = &ipgre_net_id,
c5441932 906 .size = sizeof(struct ip_tunnel_net),
59a4c759 907};
1da177e4 908
c19e654d
HX		 909static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
910{
911 __be16 flags;
912
913 if (!data)
914 return 0;
915
916 flags = 0;
917 if (data[IFLA_GRE_IFLAGS])
918 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
919 if (data[IFLA_GRE_OFLAGS])
920 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
921 if (flags & (GRE_VERSION|GRE_ROUTING))
922 return -EINVAL;
923
924 return 0;
925}
926
e1a80002
HX		 927static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
928{
929 __be32 daddr;
930
931 if (tb[IFLA_ADDRESS]) {
932 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
933 return -EINVAL;
934 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
935 return -EADDRNOTAVAIL;
936 }
937
938 if (!data)
939 goto out;
940
941 if (data[IFLA_GRE_REMOTE]) {
942 memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4);
943 if (!daddr)
944 return -EINVAL;
945 }
946
947out:
948 return ipgre_tunnel_validate(tb, data);
949}
950
2e15ea39
PS		 951static void ipgre_netlink_parms(struct net_device *dev,
952 struct nlattr *data[],
953 struct nlattr *tb[],
954 struct ip_tunnel_parm *parms)
c19e654d 955{
7bb82d92 956 memset(parms, 0, sizeof(*parms));
c19e654d
HX		 957
958 parms->iph.protocol = IPPROTO_GRE;
959
960 if (!data)
961 return;
962
963 if (data[IFLA_GRE_LINK])
964 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
965
966 if (data[IFLA_GRE_IFLAGS])
c5441932 967 parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS]));
c19e654d
HX		 968
969 if (data[IFLA_GRE_OFLAGS])
c5441932 970 parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS]));
c19e654d
HX		 971
972 if (data[IFLA_GRE_IKEY])
973 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
974
975 if (data[IFLA_GRE_OKEY])
976 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
977
978 if (data[IFLA_GRE_LOCAL])
67b61f6c 979 parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]);
c19e654d
HX		 980
981 if (data[IFLA_GRE_REMOTE])
67b61f6c 982 parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]);
c19e654d
HX		 983
984 if (data[IFLA_GRE_TTL])
985 parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]);
986
987 if (data[IFLA_GRE_TOS])
988 parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]);
989
990 if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC]))
991 parms->iph.frag_off = htons(IP_DF);
2e15ea39
PS		 992
993 if (data[IFLA_GRE_COLLECT_METADATA]) {
994 struct ip_tunnel *t = netdev_priv(dev);
995
996 t->collect_md = true;
997 }
c19e654d
HX		 998}
999
4565e991
TH		 1000/* This function returns true when ENCAP attributes are present in the nl msg */
1001static bool ipgre_netlink_encap_parms(struct nlattr *data[],
1002 struct ip_tunnel_encap *ipencap)
1003{
1004 bool ret = false;
1005
1006 memset(ipencap, 0, sizeof(*ipencap));
1007
1008 if (!data)
1009 return ret;
1010
1011 if (data[IFLA_GRE_ENCAP_TYPE]) {
1012 ret = true;
1013 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1014 }
1015
1016 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1017 ret = true;
1018 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1019 }
1020
1021 if (data[IFLA_GRE_ENCAP_SPORT]) {
1022 ret = true;
3e97fa70 1023 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
4565e991
TH		 1024 }
1025
1026 if (data[IFLA_GRE_ENCAP_DPORT]) {
1027 ret = true;
3e97fa70 1028 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
4565e991
TH		 1029 }
1030
1031 return ret;
1032}
1033
c5441932 1034static int gre_tap_init(struct net_device *dev)
e1a80002 1035{
c5441932 1036 __gre_tunnel_init(dev);
bec94d43 1037 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
e1a80002 1038
c5441932 1039 return ip_tunnel_init(dev);
e1a80002
HX		 1040}
1041
c5441932
PS		 1042static const struct net_device_ops gre_tap_netdev_ops = {
1043 .ndo_init = gre_tap_init,
1044 .ndo_uninit = ip_tunnel_uninit,
1045 .ndo_start_xmit = gre_tap_xmit,
b8c26a33
SH		 1046 .ndo_set_mac_address = eth_mac_addr,
1047 .ndo_validate_addr = eth_validate_addr,
c5441932
PS		 1048 .ndo_change_mtu = ip_tunnel_change_mtu,
1049 .ndo_get_stats64 = ip_tunnel_get_stats64,
1e99584b 1050 .ndo_get_iflink = ip_tunnel_get_iflink,
fc4099f1 1051 .ndo_fill_metadata_dst = gre_fill_metadata_dst,
b8c26a33
SH		 1052};
1053
e1a80002
HX		 1054static void ipgre_tap_setup(struct net_device *dev)
1055{
e1a80002 1056 ether_setup(dev);
c5441932 1057 dev->netdev_ops = &gre_tap_netdev_ops;
f8c1b7ce 1058 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
c5441932 1059 ip_tunnel_setup(dev, gre_tap_net_id);
e1a80002
HX		 1060}
1061
c5441932
PS		 1062static int ipgre_newlink(struct net *src_net, struct net_device *dev,
1063 struct nlattr *tb[], struct nlattr *data[])
c19e654d 1064{
c5441932 1065 struct ip_tunnel_parm p;
4565e991
TH		 1066 struct ip_tunnel_encap ipencap;
1067
1068 if (ipgre_netlink_encap_parms(data, &ipencap)) {
1069 struct ip_tunnel *t = netdev_priv(dev);
1070 int err = ip_tunnel_encap_setup(t, &ipencap);
1071
1072 if (err < 0)
1073 return err;
1074 }
c19e654d 1075
2e15ea39 1076 ipgre_netlink_parms(dev, data, tb, &p);
c5441932 1077 return ip_tunnel_newlink(dev, tb, &p);
c19e654d
HX		 1078}
1079
1080static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
1081 struct nlattr *data[])
1082{
c19e654d 1083 struct ip_tunnel_parm p;
4565e991
TH		 1084 struct ip_tunnel_encap ipencap;
1085
1086 if (ipgre_netlink_encap_parms(data, &ipencap)) {
1087 struct ip_tunnel *t = netdev_priv(dev);
1088 int err = ip_tunnel_encap_setup(t, &ipencap);
1089
1090 if (err < 0)
1091 return err;
1092 }
c19e654d 1093
2e15ea39 1094 ipgre_netlink_parms(dev, data, tb, &p);
c5441932 1095 return ip_tunnel_changelink(dev, tb, &p);
c19e654d
HX		 1096}
1097
1098static size_t ipgre_get_size(const struct net_device *dev)
1099{
1100 return
1101 /* IFLA_GRE_LINK */
1102 nla_total_size(4) +
1103 /* IFLA_GRE_IFLAGS */
1104 nla_total_size(2) +
1105 /* IFLA_GRE_OFLAGS */
1106 nla_total_size(2) +
1107 /* IFLA_GRE_IKEY */
1108 nla_total_size(4) +
1109 /* IFLA_GRE_OKEY */
1110 nla_total_size(4) +
1111 /* IFLA_GRE_LOCAL */
1112 nla_total_size(4) +
1113 /* IFLA_GRE_REMOTE */
1114 nla_total_size(4) +
1115 /* IFLA_GRE_TTL */
1116 nla_total_size(1) +
1117 /* IFLA_GRE_TOS */
1118 nla_total_size(1) +
1119 /* IFLA_GRE_PMTUDISC */
1120 nla_total_size(1) +
4565e991
TH		 1121 /* IFLA_GRE_ENCAP_TYPE */
1122 nla_total_size(2) +
1123 /* IFLA_GRE_ENCAP_FLAGS */
1124 nla_total_size(2) +
1125 /* IFLA_GRE_ENCAP_SPORT */
1126 nla_total_size(2) +
1127 /* IFLA_GRE_ENCAP_DPORT */
1128 nla_total_size(2) +
2e15ea39
PS		 1129 /* IFLA_GRE_COLLECT_METADATA */
1130 nla_total_size(0) +
c19e654d
HX		 1131 0;
1132}
1133
1134static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1135{
1136 struct ip_tunnel *t = netdev_priv(dev);
1137 struct ip_tunnel_parm *p = &t->parms;
1138
f3756b79 1139 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
c5441932
PS		 1140 nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) ||
1141 nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) ||
f3756b79
DM		 1142 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1143 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1144 nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) ||
1145 nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) ||
f3756b79
DM		 1146 nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) ||
1147 nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) ||
1148 nla_put_u8(skb, IFLA_GRE_PMTUDISC,
1149 !!(p->iph.frag_off & htons(IP_DF))))
1150 goto nla_put_failure;
4565e991
TH		 1151
1152 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1153 t->encap.type) ||
3e97fa70
SD		 1154 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1155 t->encap.sport) ||
1156 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1157 t->encap.dport) ||
4565e991 1158 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
e1b2cb65 1159 t->encap.flags))
4565e991
TH		 1160 goto nla_put_failure;
1161
2e15ea39
PS		 1162 if (t->collect_md) {
1163 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
1164 goto nla_put_failure;
1165 }
1166
c19e654d
HX		 1167 return 0;
1168
1169nla_put_failure:
1170 return -EMSGSIZE;
1171}
1172
1173static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = {
1174 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1175 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1176 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1177 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1178 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
4d74f8ba
PM		 1179 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1180 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
c19e654d
HX		 1181 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1182 [IFLA_GRE_TOS] = { .type = NLA_U8 },
1183 [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
4565e991
TH		 1184 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1185 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1186 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1187 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2e15ea39 1188 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
c19e654d
HX		 1189};
1190
1191static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
1192 .kind = "gre",
1193 .maxtype = IFLA_GRE_MAX,
1194 .policy = ipgre_policy,
1195 .priv_size = sizeof(struct ip_tunnel),
1196 .setup = ipgre_tunnel_setup,
1197 .validate = ipgre_tunnel_validate,
1198 .newlink = ipgre_newlink,
1199 .changelink = ipgre_changelink,
c5441932 1200 .dellink = ip_tunnel_dellink,
c19e654d
HX		 1201 .get_size = ipgre_get_size,
1202 .fill_info = ipgre_fill_info,
1728d4fa 1203 .get_link_net = ip_tunnel_get_link_net,
c19e654d
HX		 1204};
1205
e1a80002
HX		 1206static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
1207 .kind = "gretap",
1208 .maxtype = IFLA_GRE_MAX,
1209 .policy = ipgre_policy,
1210 .priv_size = sizeof(struct ip_tunnel),
1211 .setup = ipgre_tap_setup,
1212 .validate = ipgre_tap_validate,
1213 .newlink = ipgre_newlink,
1214 .changelink = ipgre_changelink,
c5441932 1215 .dellink = ip_tunnel_dellink,
e1a80002
HX		 1216 .get_size = ipgre_get_size,
1217 .fill_info = ipgre_fill_info,
1728d4fa 1218 .get_link_net = ip_tunnel_get_link_net,
e1a80002
HX		 1219};
1220
b2acd1dc
PS		 1221struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
1222 u8 name_assign_type)
1223{
1224 struct nlattr *tb[IFLA_MAX + 1];
1225 struct net_device *dev;
1226 struct ip_tunnel *t;
1227 int err;
1228
1229 memset(&tb, 0, sizeof(tb));
1230
1231 dev = rtnl_create_link(net, name, name_assign_type,
1232 &ipgre_tap_ops, tb);
1233 if (IS_ERR(dev))
1234 return dev;
1235
1236 /* Configure flow based GRE device. */
1237 t = netdev_priv(dev);
1238 t->collect_md = true;
1239
1240 err = ipgre_newlink(net, dev, tb, NULL);
1241 if (err < 0)
1242 goto out;
1243 return dev;
1244out:
1245 free_netdev(dev);
1246 return ERR_PTR(err);
1247}
1248EXPORT_SYMBOL_GPL(gretap_fb_dev_create);
1249
c5441932
PS		 1250static int __net_init ipgre_tap_init_net(struct net *net)
1251{
2e15ea39 1252 return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0");
c5441932
PS		 1253}
1254
1255static void __net_exit ipgre_tap_exit_net(struct net *net)
1256{
1257 struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id);
6c742e71 1258 ip_tunnel_delete_net(itn, &ipgre_tap_ops);
c5441932
PS		 1259}
1260
1261static struct pernet_operations ipgre_tap_net_ops = {
1262 .init = ipgre_tap_init_net,
1263 .exit = ipgre_tap_exit_net,
1264 .id = &gre_tap_net_id,
1265 .size = sizeof(struct ip_tunnel_net),
1266};
1da177e4
LT		 1267
1268static int __init ipgre_init(void)
1269{
1270 int err;
1271
058bd4d2 1272 pr_info("GRE over IPv4 tunneling driver\n");
1da177e4 1273
cfb8fbf2 1274 err = register_pernet_device(&ipgre_net_ops);
59a4c759 1275 if (err < 0)
c2892f02
AD		 1276 return err;
1277
c5441932
PS		 1278 err = register_pernet_device(&ipgre_tap_net_ops);
1279 if (err < 0)
1280 goto pnet_tap_faied;
1281
9f57c67c 1282 err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
c2892f02 1283 if (err < 0) {
058bd4d2 1284 pr_info("%s: can't add protocol\n", __func__);
c2892f02
AD		 1285 goto add_proto_failed;
1286 }
7daa0004 1287
c19e654d
HX		 1288 err = rtnl_link_register(&ipgre_link_ops);
1289 if (err < 0)
1290 goto rtnl_link_failed;
1291
e1a80002
HX		 1292 err = rtnl_link_register(&ipgre_tap_ops);
1293 if (err < 0)
1294 goto tap_ops_failed;
1295
c5441932 1296 return 0;
c19e654d 1297
e1a80002
HX		 1298tap_ops_failed:
1299 rtnl_link_unregister(&ipgre_link_ops);
c19e654d 1300rtnl_link_failed:
9f57c67c 1301 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
c2892f02 1302add_proto_failed:
c5441932
PS		 1303 unregister_pernet_device(&ipgre_tap_net_ops);
1304pnet_tap_faied:
c2892f02 1305 unregister_pernet_device(&ipgre_net_ops);
c5441932 1306 return err;
1da177e4
LT		 1307}
1308
db44575f 1309static void __exit ipgre_fini(void)
1da177e4 1310{
e1a80002 1311 rtnl_link_unregister(&ipgre_tap_ops);
c19e654d 1312 rtnl_link_unregister(&ipgre_link_ops);
9f57c67c 1313 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
c5441932 1314 unregister_pernet_device(&ipgre_tap_net_ops);
c2892f02 1315 unregister_pernet_device(&ipgre_net_ops);
1da177e4
LT		 1316}
1317
1318module_init(ipgre_init);
1319module_exit(ipgre_fini);
1320MODULE_LICENSE("GPL");
4d74f8ba
PM		 1321MODULE_ALIAS_RTNL_LINK("gre");
1322MODULE_ALIAS_RTNL_LINK("gretap");
8909c9ad 1323MODULE_ALIAS_NETDEV("gre0");
c5441932 1324MODULE_ALIAS_NETDEV("gretap0");
Linux kernel - Deliverables
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