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xeb@mail.ruc12b3952012-08-10 00:51:50 +00001/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.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
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/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>
xeb@mail.ruc12b3952012-08-10 00:51:50 +000027#include <linux/init.h>
28#include <linux/in6.h>
29#include <linux/inetdevice.h>
30#include <linux/igmp.h>
31#include <linux/netfilter_ipv4.h>
32#include <linux/etherdevice.h>
33#include <linux/if_ether.h>
34#include <linux/hash.h>
35#include <linux/if_tunnel.h>
36#include <linux/ip6_tunnel.h>
37
38#include <net/sock.h>
39#include <net/ip.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000040#include <net/ip_tunnels.h>
xeb@mail.ruc12b3952012-08-10 00:51:50 +000041#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
Tom Herbert308edfdf2016-04-29 17:12:17 -070057#include <net/gre.h>
xeb@mail.ruc12b3952012-08-10 00:51:50 +000058
59
stephen hemmingereccc1bb2012-09-25 11:02:48 +000060static bool log_ecn_error = true;
61module_param(log_ecn_error, bool, 0644);
62MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
Jiri Kosinae87a8f22016-08-10 11:03:35 +020064#define IP6_GRE_HASH_SIZE_SHIFT 5
65#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
xeb@mail.ruc12b3952012-08-10 00:51:50 +000066
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030067static unsigned int ip6gre_net_id __read_mostly;
xeb@mail.ruc12b3952012-08-10 00:51:50 +000068struct ip6gre_net {
Jiri Kosinae87a8f22016-08-10 11:03:35 +020069 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
xeb@mail.ruc12b3952012-08-10 00:51:50 +000070
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
Nicolas Dichtel22f08062014-04-22 10:15:24 +020075static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
xeb@mail.ruc12b3952012-08-10 00:51:50 +000076static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81/* Tunnel hash table */
82
83/*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
Jiri Kosinae87a8f22016-08-10 11:03:35 +020099#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000100static u32 HASH_ADDR(const struct in6_addr *addr)
101{
102 u32 hash = ipv6_addr_hash(addr);
103
Jiri Kosinae87a8f22016-08-10 11:03:35 +0200104 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000105}
106
107#define tunnels_r_l tunnels[3]
108#define tunnels_r tunnels[2]
109#define tunnels_l tunnels[1]
110#define tunnels_wc tunnels[0]
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000111
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000112/* Given src, dst and key, find appropriate for input tunnel. */
113
114static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117{
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
Amerigo Wange086cad2012-11-11 21:52:34 +0000128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
Amerigo Wange086cad2012-11-11 21:52:34 +0000153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
Amerigo Wange086cad2012-11-11 21:52:34 +0000177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
Amerigo Wange086cad2012-11-11 21:52:34 +0000203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
Ian Morris53b24b82015-03-29 14:00:05 +0100226 if (cand)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234}
235
236static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238{
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252}
253
254static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256{
257 return __ip6gre_bucket(ign, &t->parms);
258}
259
260static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261{
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266}
267
268static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269{
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281}
282
283static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286{
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306}
307
308static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310{
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
Steffen Klassertcd0a0bd2014-09-22 10:07:26 +0200317 if (t && create)
318 return NULL;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
Tom Gundersenc835a672014-07-14 16:37:24 +0200327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200339 nt->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
Tom Herbertb45bd1d2016-05-09 17:12:12 -0700346 if (!(nt->parms.o_flags & TUNNEL_SEQ))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353failed_free:
354 free_netdev(dev);
355 return NULL;
356}
357
358static void ip6gre_tunnel_uninit(struct net_device *dev)
359{
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000362
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200363 ip6gre_tunnel_unlink(ign, t);
Paolo Abeni607f7252016-02-12 15:43:54 +0100364 dst_cache_reset(&t->dst_cache);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000365 dev_put(dev);
366}
367
368
369static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Eric Dumazet78920322017-02-04 23:18:55 -0800370 u8 type, u8 code, int offset, __be32 info)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000371{
Eric Dumazet78920322017-02-04 23:18:55 -0800372 const struct gre_base_hdr *greh;
373 const struct ipv6hdr *ipv6h;
374 int grehlen = sizeof(*greh);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000375 struct ip6_tnl *t;
Eric Dumazet78920322017-02-04 23:18:55 -0800376 int key_off = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000377 __be16 flags;
Eric Dumazet78920322017-02-04 23:18:55 -0800378 __be32 key;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000379
Eric Dumazet78920322017-02-04 23:18:55 -0800380 if (!pskb_may_pull(skb, offset + grehlen))
381 return;
382 greh = (const struct gre_base_hdr *)(skb->data + offset);
383 flags = greh->flags;
384 if (flags & (GRE_VERSION | GRE_ROUTING))
385 return;
386 if (flags & GRE_CSUM)
387 grehlen += 4;
388 if (flags & GRE_KEY) {
389 key_off = grehlen + offset;
390 grehlen += 4;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000391 }
392
Eric Dumazet78920322017-02-04 23:18:55 -0800393 if (!pskb_may_pull(skb, offset + grehlen))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000394 return;
Eric Dumazetb87fb392012-08-19 03:47:30 +0000395 ipv6h = (const struct ipv6hdr *)skb->data;
Eric Dumazet78920322017-02-04 23:18:55 -0800396 greh = (const struct gre_base_hdr *)(skb->data + offset);
397 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000398
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000399 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
Eric Dumazet78920322017-02-04 23:18:55 -0800400 key, greh->protocol);
Ian Morris63159f22015-03-29 14:00:04 +0100401 if (!t)
stephen hemminger0c5794a2012-09-24 18:12:24 +0000402 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000403
404 switch (type) {
405 __u32 teli;
406 struct ipv6_tlv_tnl_enc_lim *tel;
407 __u32 mtu;
408 case ICMPV6_DEST_UNREACH:
Matt Bennetta46496c2015-09-23 16:58:31 +1200409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
410 t->parms.name);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000411 break;
412 case ICMPV6_TIME_EXCEED:
413 if (code == ICMPV6_EXC_HOPLIMIT) {
Matt Bennetta46496c2015-09-23 16:58:31 +1200414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
415 t->parms.name);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000416 }
417 break;
418 case ICMPV6_PARAMPROB:
419 teli = 0;
420 if (code == ICMPV6_HDR_FIELD)
421 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
422
Sabrina Dubrocad1e158e2015-02-04 15:25:09 +0100423 if (teli && teli == be32_to_cpu(info) - 2) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000424 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
425 if (tel->encap_limit == 0) {
Matt Bennetta46496c2015-09-23 16:58:31 +1200426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
427 t->parms.name);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000428 }
429 } else {
Matt Bennetta46496c2015-09-23 16:58:31 +1200430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
431 t->parms.name);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000432 }
433 break;
434 case ICMPV6_PKT_TOOBIG:
Sabrina Dubrocad1e158e2015-02-04 15:25:09 +0100435 mtu = be32_to_cpu(info) - offset;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000436 if (mtu < IPV6_MIN_MTU)
437 mtu = IPV6_MIN_MTU;
438 t->dev->mtu = mtu;
439 break;
440 }
441
442 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
443 t->err_count++;
444 else
445 t->err_count = 1;
446 t->err_time = jiffies;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000447}
448
Tom Herbert308edfdf2016-04-29 17:12:17 -0700449static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000450{
451 const struct ipv6hdr *ipv6h;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000452 struct ip6_tnl *tunnel;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000453
454 ipv6h = ipv6_hdr(skb);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000455 tunnel = ip6gre_tunnel_lookup(skb->dev,
Tom Herbert308edfdf2016-04-29 17:12:17 -0700456 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
457 tpi->proto);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000458 if (tunnel) {
Tom Herbert308edfdf2016-04-29 17:12:17 -0700459 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000460
Tom Herbert308edfdf2016-04-29 17:12:17 -0700461 return PACKET_RCVD;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000462 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000463
Tom Herbert308edfdf2016-04-29 17:12:17 -0700464 return PACKET_REJECT;
465}
466
467static int gre_rcv(struct sk_buff *skb)
468{
469 struct tnl_ptk_info tpi;
470 bool csum_err = false;
471 int hdr_len;
472
Eric Dumazete5826152016-06-15 06:24:00 -0700473 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
Jiri Bencf132ae72016-05-03 15:00:21 +0200474 if (hdr_len < 0)
Tom Herbert308edfdf2016-04-29 17:12:17 -0700475 goto drop;
476
477 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
478 goto drop;
479
480 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
481 return 0;
482
483 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000484drop:
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000485 kfree_skb(skb);
486 return 0;
487}
488
Tom Herbertb05229f2016-04-29 17:12:21 -0700489static int gre_handle_offloads(struct sk_buff *skb, bool csum)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000490{
Tom Herbertb05229f2016-04-29 17:12:21 -0700491 return iptunnel_handle_offloads(skb,
492 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000493}
494
Tom Herbertb05229f2016-04-29 17:12:21 -0700495static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
496 struct net_device *dev, __u8 dsfield,
497 struct flowi6 *fl6, int encap_limit,
498 __u32 *pmtu, __be16 proto)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000499{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000500 struct ip6_tnl *tunnel = netdev_priv(dev);
Tom Herbertb05229f2016-04-29 17:12:21 -0700501 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
502 htons(ETH_P_TEB) : proto;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000503
504 if (dev->type == ARPHRD_ETHER)
505 IPCB(skb)->flags = 0;
506
Tom Herbertb05229f2016-04-29 17:12:21 -0700507 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
508 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
509 else
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000510 fl6->daddr = tunnel->parms.raddr;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000511
Tom Herbertb05229f2016-04-29 17:12:21 -0700512 if (tunnel->parms.o_flags & TUNNEL_SEQ)
513 tunnel->o_seqno++;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000514
Tom Herbertb05229f2016-04-29 17:12:21 -0700515 /* Push GRE header. */
516 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
517 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000518
Tom Herbertb05229f2016-04-29 17:12:21 -0700519 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
520 NEXTHDR_GRE);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000521}
522
523static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
524{
525 struct ip6_tnl *t = netdev_priv(dev);
526 const struct iphdr *iph = ip_hdr(skb);
527 int encap_limit = -1;
528 struct flowi6 fl6;
529 __u8 dsfield;
530 __u32 mtu;
531 int err;
532
Bernie Harris5146d1f2016-02-22 12:58:05 +1300533 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
534
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000535 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
536 encap_limit = t->parms.encap_limit;
537
538 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000539
540 dsfield = ipv4_get_dsfield(iph);
541
542 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
543 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
544 & IPV6_TCLASS_MASK;
545 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
546 fl6.flowi6_mark = skb->mark;
Craig Gallek0a473b82017-04-19 12:30:53 -0400547 else
548 fl6.flowi6_mark = t->parms.fwmark;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000549
Lorenzo Colittie2d118a2016-11-04 02:23:43 +0900550 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
551
Tom Herbertb05229f2016-04-29 17:12:21 -0700552 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
553 if (err)
554 return -1;
555
556 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
557 skb->protocol);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000558 if (err != 0) {
559 /* XXX: send ICMP error even if DF is not set. */
560 if (err == -EMSGSIZE)
561 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
562 htonl(mtu));
563 return -1;
564 }
565
566 return 0;
567}
568
569static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
570{
571 struct ip6_tnl *t = netdev_priv(dev);
572 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
573 int encap_limit = -1;
574 __u16 offset;
575 struct flowi6 fl6;
576 __u8 dsfield;
577 __u32 mtu;
578 int err;
579
580 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
581 return -1;
582
583 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
Eric Dumazet21b995a2017-01-23 16:43:05 -0800584 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
585 ipv6h = ipv6_hdr(skb);
586
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000587 if (offset > 0) {
588 struct ipv6_tlv_tnl_enc_lim *tel;
589 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
590 if (tel->encap_limit == 0) {
591 icmpv6_send(skb, ICMPV6_PARAMPROB,
592 ICMPV6_HDR_FIELD, offset + 2);
593 return -1;
594 }
595 encap_limit = tel->encap_limit - 1;
596 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
597 encap_limit = t->parms.encap_limit;
598
599 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000600
601 dsfield = ipv6_get_dsfield(ipv6h);
602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
603 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
604 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
Florent Fourcot3308de22013-12-08 15:47:00 +0100605 fl6.flowlabel |= ip6_flowlabel(ipv6h);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000606 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
607 fl6.flowi6_mark = skb->mark;
Craig Gallek0a473b82017-04-19 12:30:53 -0400608 else
609 fl6.flowi6_mark = t->parms.fwmark;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000610
Lorenzo Colittie2d118a2016-11-04 02:23:43 +0900611 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
612
Tom Herbertb05229f2016-04-29 17:12:21 -0700613 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
614 return -1;
615
616 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
617 &mtu, skb->protocol);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000618 if (err != 0) {
619 if (err == -EMSGSIZE)
620 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
621 return -1;
622 }
623
624 return 0;
625}
626
627/**
628 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
629 * @t: the outgoing tunnel device
630 * @hdr: IPv6 header from the incoming packet
631 *
632 * Description:
633 * Avoid trivial tunneling loop by checking that tunnel exit-point
634 * doesn't match source of incoming packet.
635 *
636 * Return:
637 * 1 if conflict,
638 * 0 else
639 **/
640
641static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
642 const struct ipv6hdr *hdr)
643{
644 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
645}
646
647static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
648{
649 struct ip6_tnl *t = netdev_priv(dev);
650 int encap_limit = -1;
651 struct flowi6 fl6;
652 __u32 mtu;
653 int err;
654
655 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
656 encap_limit = t->parms.encap_limit;
657
658 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000659
Tom Herbertb05229f2016-04-29 17:12:21 -0700660 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
661 if (err)
662 return err;
663
664 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000665
666 return err;
667}
668
669static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
670 struct net_device *dev)
671{
672 struct ip6_tnl *t = netdev_priv(dev);
673 struct net_device_stats *stats = &t->dev->stats;
674 int ret;
675
Steffen Klassertd5005142014-11-05 08:02:48 +0100676 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
Tommi Rantala41ab3e32013-02-06 03:24:02 +0000677 goto tx_err;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000678
679 switch (skb->protocol) {
680 case htons(ETH_P_IP):
681 ret = ip6gre_xmit_ipv4(skb, dev);
682 break;
683 case htons(ETH_P_IPV6):
684 ret = ip6gre_xmit_ipv6(skb, dev);
685 break;
686 default:
687 ret = ip6gre_xmit_other(skb, dev);
688 break;
689 }
690
691 if (ret < 0)
692 goto tx_err;
693
694 return NETDEV_TX_OK;
695
696tx_err:
697 stats->tx_errors++;
698 stats->tx_dropped++;
699 kfree_skb(skb);
700 return NETDEV_TX_OK;
701}
702
703static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
704{
705 struct net_device *dev = t->dev;
706 struct __ip6_tnl_parm *p = &t->parms;
707 struct flowi6 *fl6 = &t->fl.u.ip6;
Tom Herbertdb2ec952016-05-09 17:12:08 -0700708 int t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000709
710 if (dev->type != ARPHRD_ETHER) {
711 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
712 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
713 }
714
715 /* Set up flowi template */
716 fl6->saddr = p->laddr;
717 fl6->daddr = p->raddr;
718 fl6->flowi6_oif = p->link;
719 fl6->flowlabel = 0;
Haishuang Yan252f3f52016-05-21 18:17:35 +0800720 fl6->flowi6_proto = IPPROTO_GRE;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000721
722 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
723 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
724 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
725 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
726
727 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
728 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
729
730 if (p->flags&IP6_TNL_F_CAP_XMIT &&
731 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
732 dev->flags |= IFF_POINTOPOINT;
733 else
734 dev->flags &= ~IFF_POINTOPOINT;
735
Tom Herbertdb2ec952016-05-09 17:12:08 -0700736 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
737
Tom Herbert1faf3d92016-05-18 09:06:19 -0700738 t->hlen = t->encap_hlen + t->tun_hlen;
Tom Herbertdb2ec952016-05-09 17:12:08 -0700739
740 t_hlen = t->hlen + sizeof(struct ipv6hdr);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000741
742 if (p->flags & IP6_TNL_F_CAP_XMIT) {
743 int strict = (ipv6_addr_type(&p->raddr) &
744 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
745
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200746 struct rt6_info *rt = rt6_lookup(t->net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000747 &p->raddr, &p->laddr,
748 p->link, strict);
749
Ian Morris63159f22015-03-29 14:00:04 +0100750 if (!rt)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000751 return;
752
753 if (rt->dst.dev) {
Tom Herbertdb2ec952016-05-09 17:12:08 -0700754 dev->hard_header_len = rt->dst.dev->hard_header_len +
755 t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000756
757 if (set_mtu) {
Tom Herbertdb2ec952016-05-09 17:12:08 -0700758 dev->mtu = rt->dst.dev->mtu - t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000759 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
760 dev->mtu -= 8;
Alexander Duycka9e242c2016-04-14 15:33:45 -0400761 if (dev->type == ARPHRD_ETHER)
762 dev->mtu -= ETH_HLEN;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000763
764 if (dev->mtu < IPV6_MIN_MTU)
765 dev->mtu = IPV6_MIN_MTU;
766 }
767 }
Amerigo Wang94e187c2012-10-29 00:13:19 +0000768 ip6_rt_put(rt);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000769 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000770}
771
772static int ip6gre_tnl_change(struct ip6_tnl *t,
773 const struct __ip6_tnl_parm *p, int set_mtu)
774{
775 t->parms.laddr = p->laddr;
776 t->parms.raddr = p->raddr;
777 t->parms.flags = p->flags;
778 t->parms.hop_limit = p->hop_limit;
779 t->parms.encap_limit = p->encap_limit;
780 t->parms.flowinfo = p->flowinfo;
781 t->parms.link = p->link;
782 t->parms.proto = p->proto;
783 t->parms.i_key = p->i_key;
784 t->parms.o_key = p->o_key;
785 t->parms.i_flags = p->i_flags;
786 t->parms.o_flags = p->o_flags;
Craig Gallek0a473b82017-04-19 12:30:53 -0400787 t->parms.fwmark = p->fwmark;
Paolo Abeni607f7252016-02-12 15:43:54 +0100788 dst_cache_reset(&t->dst_cache);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000789 ip6gre_tnl_link_config(t, set_mtu);
790 return 0;
791}
792
793static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
794 const struct ip6_tnl_parm2 *u)
795{
796 p->laddr = u->laddr;
797 p->raddr = u->raddr;
798 p->flags = u->flags;
799 p->hop_limit = u->hop_limit;
800 p->encap_limit = u->encap_limit;
801 p->flowinfo = u->flowinfo;
802 p->link = u->link;
803 p->i_key = u->i_key;
804 p->o_key = u->o_key;
Tom Herbertf41fe3c2016-05-09 17:12:09 -0700805 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
806 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000807 memcpy(p->name, u->name, sizeof(u->name));
808}
809
810static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
811 const struct __ip6_tnl_parm *p)
812{
813 u->proto = IPPROTO_GRE;
814 u->laddr = p->laddr;
815 u->raddr = p->raddr;
816 u->flags = p->flags;
817 u->hop_limit = p->hop_limit;
818 u->encap_limit = p->encap_limit;
819 u->flowinfo = p->flowinfo;
820 u->link = p->link;
821 u->i_key = p->i_key;
822 u->o_key = p->o_key;
Tom Herbertf41fe3c2016-05-09 17:12:09 -0700823 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
824 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000825 memcpy(u->name, p->name, sizeof(u->name));
826}
827
828static int ip6gre_tunnel_ioctl(struct net_device *dev,
829 struct ifreq *ifr, int cmd)
830{
831 int err = 0;
832 struct ip6_tnl_parm2 p;
833 struct __ip6_tnl_parm p1;
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200834 struct ip6_tnl *t = netdev_priv(dev);
835 struct net *net = t->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000836 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
837
Tom Herbert308edfdf2016-04-29 17:12:17 -0700838 memset(&p1, 0, sizeof(p1));
839
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000840 switch (cmd) {
841 case SIOCGETTUNNEL:
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000842 if (dev == ign->fb_tunnel_dev) {
843 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
844 err = -EFAULT;
845 break;
846 }
847 ip6gre_tnl_parm_from_user(&p1, &p);
848 t = ip6gre_tunnel_locate(net, &p1, 0);
Ian Morris63159f22015-03-29 14:00:04 +0100849 if (!t)
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200850 t = netdev_priv(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000851 }
Amerigo Wang5dbd5062013-05-09 21:56:37 +0000852 memset(&p, 0, sizeof(p));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000853 ip6gre_tnl_parm_to_user(&p, &t->parms);
854 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
855 err = -EFAULT;
856 break;
857
858 case SIOCADDTUNNEL:
859 case SIOCCHGTUNNEL:
860 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000861 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000862 goto done;
863
864 err = -EFAULT;
865 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
866 goto done;
867
868 err = -EINVAL;
869 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
870 goto done;
871
872 if (!(p.i_flags&GRE_KEY))
873 p.i_key = 0;
874 if (!(p.o_flags&GRE_KEY))
875 p.o_key = 0;
876
877 ip6gre_tnl_parm_from_user(&p1, &p);
878 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
879
880 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Ian Morris53b24b82015-03-29 14:00:05 +0100881 if (t) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000882 if (t->dev != dev) {
883 err = -EEXIST;
884 break;
885 }
886 } else {
887 t = netdev_priv(dev);
888
889 ip6gre_tunnel_unlink(ign, t);
890 synchronize_net();
891 ip6gre_tnl_change(t, &p1, 1);
892 ip6gre_tunnel_link(ign, t);
893 netdev_state_change(dev);
894 }
895 }
896
897 if (t) {
898 err = 0;
899
Amerigo Wang5dbd5062013-05-09 21:56:37 +0000900 memset(&p, 0, sizeof(p));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000901 ip6gre_tnl_parm_to_user(&p, &t->parms);
902 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
903 err = -EFAULT;
904 } else
905 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
906 break;
907
908 case SIOCDELTUNNEL:
909 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000910 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000911 goto done;
912
913 if (dev == ign->fb_tunnel_dev) {
914 err = -EFAULT;
915 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
916 goto done;
917 err = -ENOENT;
918 ip6gre_tnl_parm_from_user(&p1, &p);
919 t = ip6gre_tunnel_locate(net, &p1, 0);
Ian Morris63159f22015-03-29 14:00:04 +0100920 if (!t)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000921 goto done;
922 err = -EPERM;
923 if (t == netdev_priv(ign->fb_tunnel_dev))
924 goto done;
925 dev = t->dev;
926 }
927 unregister_netdevice(dev);
928 err = 0;
929 break;
930
931 default:
932 err = -EINVAL;
933 }
934
935done:
936 return err;
937}
938
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000939static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
940 unsigned short type,
941 const void *daddr, const void *saddr, unsigned int len)
942{
943 struct ip6_tnl *t = netdev_priv(dev);
944 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
945 __be16 *p = (__be16 *)(ipv6h+1);
946
Tom Herbertcb1ce2e2014-07-01 21:33:10 -0700947 ip6_flow_hdr(ipv6h, 0,
948 ip6_make_flowlabel(dev_net(dev), skb,
Tom Herbert42240902015-07-31 16:52:12 -0700949 t->fl.u.ip6.flowlabel, true,
Tom Herbert67800f92015-07-31 16:52:11 -0700950 &t->fl.u.ip6));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000951 ipv6h->hop_limit = t->parms.hop_limit;
952 ipv6h->nexthdr = NEXTHDR_GRE;
953 ipv6h->saddr = t->parms.laddr;
954 ipv6h->daddr = t->parms.raddr;
955
956 p[0] = t->parms.o_flags;
957 p[1] = htons(type);
958
959 /*
960 * Set the source hardware address.
961 */
962
963 if (saddr)
964 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
965 if (daddr)
966 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
967 if (!ipv6_addr_any(&ipv6h->daddr))
968 return t->hlen;
969
970 return -t->hlen;
971}
972
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000973static const struct header_ops ip6gre_header_ops = {
974 .create = ip6gre_header,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000975};
976
977static const struct net_device_ops ip6gre_netdev_ops = {
978 .ndo_init = ip6gre_tunnel_init,
979 .ndo_uninit = ip6gre_tunnel_uninit,
980 .ndo_start_xmit = ip6gre_tunnel_xmit,
981 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
Tom Herbertb05229f2016-04-29 17:12:21 -0700982 .ndo_change_mtu = ip6_tnl_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +0000983 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +0200984 .ndo_get_iflink = ip6_tnl_get_iflink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000985};
986
987static void ip6gre_dev_free(struct net_device *dev)
988{
Martin KaFai Laucdf34642015-09-15 14:30:07 -0700989 struct ip6_tnl *t = netdev_priv(dev);
990
Paolo Abeni607f7252016-02-12 15:43:54 +0100991 dst_cache_destroy(&t->dst_cache);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000992 free_percpu(dev->tstats);
993 free_netdev(dev);
994}
995
996static void ip6gre_tunnel_setup(struct net_device *dev)
997{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000998 dev->netdev_ops = &ip6gre_netdev_ops;
999 dev->destructor = ip6gre_dev_free;
1000
1001 dev->type = ARPHRD_IP6GRE;
Tom Herbertb05229f2016-04-29 17:12:21 -07001002
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001003 dev->flags |= IFF_NOARP;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001004 dev->addr_len = sizeof(struct in6_addr);
Eric Dumazet02875872014-10-05 18:38:35 -07001005 netif_keep_dst(dev);
Felix Jia45ce0fd2017-01-26 16:59:18 +13001006 /* This perm addr will be used as interface identifier by IPv6 */
1007 dev->addr_assign_type = NET_ADDR_RANDOM;
1008 eth_random_addr(dev->perm_addr);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001009}
1010
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001011static int ip6gre_tunnel_init_common(struct net_device *dev)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001012{
1013 struct ip6_tnl *tunnel;
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001014 int ret;
Tom Herbertb05229f2016-04-29 17:12:21 -07001015 int t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001016
1017 tunnel = netdev_priv(dev);
1018
1019 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001020 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001021 strcpy(tunnel->parms.name, dev->name);
1022
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001023 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1024 if (!dev->tstats)
1025 return -ENOMEM;
1026
Paolo Abeni607f7252016-02-12 15:43:54 +01001027 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001028 if (ret) {
1029 free_percpu(dev->tstats);
1030 dev->tstats = NULL;
1031 return ret;
1032 }
1033
Tom Herbertb05229f2016-04-29 17:12:21 -07001034 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
Tom Herbert1faf3d92016-05-18 09:06:19 -07001035 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
Tom Herbertb05229f2016-04-29 17:12:21 -07001036 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1037
Tom Herbertdb2ec952016-05-09 17:12:08 -07001038 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1039 dev->mtu = ETH_DATA_LEN - t_hlen;
Haishuang Yan1b227e52016-05-21 18:17:34 +08001040 if (dev->type == ARPHRD_ETHER)
1041 dev->mtu -= ETH_HLEN;
Tom Herbertb05229f2016-04-29 17:12:21 -07001042 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1043 dev->mtu -= 8;
1044
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001045 return 0;
1046}
1047
1048static int ip6gre_tunnel_init(struct net_device *dev)
1049{
1050 struct ip6_tnl *tunnel;
1051 int ret;
1052
1053 ret = ip6gre_tunnel_init_common(dev);
1054 if (ret)
1055 return ret;
1056
1057 tunnel = netdev_priv(dev);
1058
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001059 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1060 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1061
1062 if (ipv6_addr_any(&tunnel->parms.raddr))
1063 dev->header_ops = &ip6gre_header_ops;
1064
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001065 return 0;
1066}
1067
1068static void ip6gre_fb_tunnel_init(struct net_device *dev)
1069{
1070 struct ip6_tnl *tunnel = netdev_priv(dev);
1071
1072 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001073 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001074 strcpy(tunnel->parms.name, dev->name);
1075
1076 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1077
1078 dev_hold(dev);
1079}
1080
1081
1082static struct inet6_protocol ip6gre_protocol __read_mostly = {
Tom Herbert308edfdf2016-04-29 17:12:17 -07001083 .handler = gre_rcv,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001084 .err_handler = ip6gre_err,
1085 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1086};
1087
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001088static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001089{
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001090 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1091 struct net_device *dev, *aux;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001092 int prio;
1093
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001094 for_each_netdev_safe(net, dev, aux)
1095 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1096 dev->rtnl_link_ops == &ip6gre_tap_ops)
1097 unregister_netdevice_queue(dev, head);
1098
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001099 for (prio = 0; prio < 4; prio++) {
1100 int h;
Jiri Kosinae87a8f22016-08-10 11:03:35 +02001101 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001102 struct ip6_tnl *t;
1103
1104 t = rtnl_dereference(ign->tunnels[prio][h]);
1105
Ian Morris53b24b82015-03-29 14:00:05 +01001106 while (t) {
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001107 /* If dev is in the same netns, it has already
1108 * been added to the list by the previous loop.
1109 */
1110 if (!net_eq(dev_net(t->dev), net))
1111 unregister_netdevice_queue(t->dev,
1112 head);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001113 t = rtnl_dereference(t->next);
1114 }
1115 }
1116 }
1117}
1118
1119static int __net_init ip6gre_init_net(struct net *net)
1120{
1121 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1122 int err;
1123
1124 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001125 NET_NAME_UNKNOWN,
1126 ip6gre_tunnel_setup);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001127 if (!ign->fb_tunnel_dev) {
1128 err = -ENOMEM;
1129 goto err_alloc_dev;
1130 }
1131 dev_net_set(ign->fb_tunnel_dev, net);
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001132 /* FB netdevice is special: we have one, and only one per netns.
1133 * Allowing to move it to another netns is clearly unsafe.
1134 */
1135 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1136
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001137
1138 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1139 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1140
1141 err = register_netdev(ign->fb_tunnel_dev);
1142 if (err)
1143 goto err_reg_dev;
1144
1145 rcu_assign_pointer(ign->tunnels_wc[0],
1146 netdev_priv(ign->fb_tunnel_dev));
1147 return 0;
1148
1149err_reg_dev:
1150 ip6gre_dev_free(ign->fb_tunnel_dev);
1151err_alloc_dev:
1152 return err;
1153}
1154
1155static void __net_exit ip6gre_exit_net(struct net *net)
1156{
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001157 LIST_HEAD(list);
1158
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001159 rtnl_lock();
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001160 ip6gre_destroy_tunnels(net, &list);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001161 unregister_netdevice_many(&list);
1162 rtnl_unlock();
1163}
1164
1165static struct pernet_operations ip6gre_net_ops = {
1166 .init = ip6gre_init_net,
1167 .exit = ip6gre_exit_net,
1168 .id = &ip6gre_net_id,
1169 .size = sizeof(struct ip6gre_net),
1170};
1171
1172static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1173{
1174 __be16 flags;
1175
1176 if (!data)
1177 return 0;
1178
1179 flags = 0;
1180 if (data[IFLA_GRE_IFLAGS])
1181 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1182 if (data[IFLA_GRE_OFLAGS])
1183 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1184 if (flags & (GRE_VERSION|GRE_ROUTING))
1185 return -EINVAL;
1186
1187 return 0;
1188}
1189
1190static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1191{
1192 struct in6_addr daddr;
1193
1194 if (tb[IFLA_ADDRESS]) {
1195 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1196 return -EINVAL;
1197 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1198 return -EADDRNOTAVAIL;
1199 }
1200
1201 if (!data)
1202 goto out;
1203
1204 if (data[IFLA_GRE_REMOTE]) {
Jiri Benc67b61f62015-03-29 16:59:26 +02001205 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001206 if (ipv6_addr_any(&daddr))
1207 return -EINVAL;
1208 }
1209
1210out:
1211 return ip6gre_tunnel_validate(tb, data);
1212}
1213
1214
1215static void ip6gre_netlink_parms(struct nlattr *data[],
1216 struct __ip6_tnl_parm *parms)
1217{
1218 memset(parms, 0, sizeof(*parms));
1219
1220 if (!data)
1221 return;
1222
1223 if (data[IFLA_GRE_LINK])
1224 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1225
1226 if (data[IFLA_GRE_IFLAGS])
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001227 parms->i_flags = gre_flags_to_tnl_flags(
1228 nla_get_be16(data[IFLA_GRE_IFLAGS]));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001229
1230 if (data[IFLA_GRE_OFLAGS])
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001231 parms->o_flags = gre_flags_to_tnl_flags(
1232 nla_get_be16(data[IFLA_GRE_OFLAGS]));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001233
1234 if (data[IFLA_GRE_IKEY])
1235 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1236
1237 if (data[IFLA_GRE_OKEY])
1238 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1239
1240 if (data[IFLA_GRE_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +02001241 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001242
1243 if (data[IFLA_GRE_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +02001244 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001245
1246 if (data[IFLA_GRE_TTL])
1247 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1248
1249 if (data[IFLA_GRE_ENCAP_LIMIT])
1250 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1251
1252 if (data[IFLA_GRE_FLOWINFO])
Lance Richardsonc2675de2016-09-24 14:01:04 -04001253 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001254
1255 if (data[IFLA_GRE_FLAGS])
1256 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
Craig Gallek0a473b82017-04-19 12:30:53 -04001257
1258 if (data[IFLA_GRE_FWMARK])
1259 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001260}
1261
1262static int ip6gre_tap_init(struct net_device *dev)
1263{
1264 struct ip6_tnl *tunnel;
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001265 int ret;
1266
1267 ret = ip6gre_tunnel_init_common(dev);
1268 if (ret)
1269 return ret;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001270
Shweta Choudaha0a46baa2016-06-08 20:15:43 +01001271 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1272
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001273 tunnel = netdev_priv(dev);
1274
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001275 ip6gre_tnl_link_config(tunnel, 1);
1276
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001277 return 0;
1278}
1279
1280static const struct net_device_ops ip6gre_tap_netdev_ops = {
1281 .ndo_init = ip6gre_tap_init,
1282 .ndo_uninit = ip6gre_tunnel_uninit,
1283 .ndo_start_xmit = ip6gre_tunnel_xmit,
1284 .ndo_set_mac_address = eth_mac_addr,
1285 .ndo_validate_addr = eth_validate_addr,
Tom Herbertb05229f2016-04-29 17:12:21 -07001286 .ndo_change_mtu = ip6_tnl_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001287 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001288 .ndo_get_iflink = ip6_tnl_get_iflink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001289};
1290
Alexander Duyckac4eb002016-04-14 15:33:51 -04001291#define GRE6_FEATURES (NETIF_F_SG | \
1292 NETIF_F_FRAGLIST | \
1293 NETIF_F_HIGHDMA | \
1294 NETIF_F_HW_CSUM)
1295
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001296static void ip6gre_tap_setup(struct net_device *dev)
1297{
1298
1299 ether_setup(dev);
1300
1301 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1302 dev->destructor = ip6gre_dev_free;
1303
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001304 dev->features |= NETIF_F_NETNS_LOCAL;
Jiri Bencd13b1612016-02-17 15:32:53 +01001305 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
Shweta Choudaha0a46baa2016-06-08 20:15:43 +01001306 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001307}
1308
Tom Herbert1faf3d92016-05-18 09:06:19 -07001309static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1310 struct ip_tunnel_encap *ipencap)
1311{
1312 bool ret = false;
1313
1314 memset(ipencap, 0, sizeof(*ipencap));
1315
1316 if (!data)
1317 return ret;
1318
1319 if (data[IFLA_GRE_ENCAP_TYPE]) {
1320 ret = true;
1321 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1322 }
1323
1324 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1325 ret = true;
1326 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1327 }
1328
1329 if (data[IFLA_GRE_ENCAP_SPORT]) {
1330 ret = true;
1331 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1332 }
1333
1334 if (data[IFLA_GRE_ENCAP_DPORT]) {
1335 ret = true;
1336 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1337 }
1338
1339 return ret;
1340}
1341
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001342static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1343 struct nlattr *tb[], struct nlattr *data[])
1344{
1345 struct ip6_tnl *nt;
1346 struct net *net = dev_net(dev);
1347 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
Tom Herbert1faf3d92016-05-18 09:06:19 -07001348 struct ip_tunnel_encap ipencap;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001349 int err;
1350
1351 nt = netdev_priv(dev);
Tom Herbert1faf3d92016-05-18 09:06:19 -07001352
1353 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1354 int err = ip6_tnl_encap_setup(nt, &ipencap);
1355
1356 if (err < 0)
1357 return err;
1358 }
1359
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001360 ip6gre_netlink_parms(data, &nt->parms);
1361
1362 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1363 return -EEXIST;
1364
1365 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1366 eth_hw_addr_random(dev);
1367
1368 nt->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001369 nt->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001370 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1371
Alexander Duyckac4eb002016-04-14 15:33:51 -04001372 dev->features |= GRE6_FEATURES;
1373 dev->hw_features |= GRE6_FEATURES;
1374
Tom Herbertb45bd1d2016-05-09 17:12:12 -07001375 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
Alexander Duyck6a553682016-05-18 10:44:47 -07001376 /* TCP offload with GRE SEQ is not supported, nor
1377 * can we support 2 levels of outer headers requiring
1378 * an update.
Alexander Duyck3a80e1f2016-04-14 15:34:04 -04001379 */
Alexander Duyck6a553682016-05-18 10:44:47 -07001380 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1381 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1382 dev->features |= NETIF_F_GSO_SOFTWARE;
1383 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1384 }
Alexander Duyck3a80e1f2016-04-14 15:34:04 -04001385
1386 /* Can use a lockless transmit, unless we generate
1387 * output sequences
1388 */
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001389 dev->features |= NETIF_F_LLTX;
Alexander Duyck3a80e1f2016-04-14 15:34:04 -04001390 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001391
1392 err = register_netdevice(dev);
1393 if (err)
1394 goto out;
1395
1396 dev_hold(dev);
1397 ip6gre_tunnel_link(ign, nt);
1398
1399out:
1400 return err;
1401}
1402
1403static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1404 struct nlattr *data[])
1405{
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001406 struct ip6_tnl *t, *nt = netdev_priv(dev);
1407 struct net *net = nt->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001408 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1409 struct __ip6_tnl_parm p;
Tom Herbert1faf3d92016-05-18 09:06:19 -07001410 struct ip_tunnel_encap ipencap;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001411
1412 if (dev == ign->fb_tunnel_dev)
1413 return -EINVAL;
1414
Tom Herbert1faf3d92016-05-18 09:06:19 -07001415 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1416 int err = ip6_tnl_encap_setup(nt, &ipencap);
1417
1418 if (err < 0)
1419 return err;
1420 }
1421
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001422 ip6gre_netlink_parms(data, &p);
1423
1424 t = ip6gre_tunnel_locate(net, &p, 0);
1425
1426 if (t) {
1427 if (t->dev != dev)
1428 return -EEXIST;
1429 } else {
1430 t = nt;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001431 }
1432
Nicolas Dichtel6a61d4d2015-12-03 17:21:50 +01001433 ip6gre_tunnel_unlink(ign, t);
1434 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1435 ip6gre_tunnel_link(ign, t);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001436 return 0;
1437}
1438
Nicolas Dichtel54d63f782014-04-14 17:11:38 +02001439static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1440{
1441 struct net *net = dev_net(dev);
1442 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1443
1444 if (dev != ign->fb_tunnel_dev)
1445 unregister_netdevice_queue(dev, head);
1446}
1447
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001448static size_t ip6gre_get_size(const struct net_device *dev)
1449{
1450 return
1451 /* IFLA_GRE_LINK */
1452 nla_total_size(4) +
1453 /* IFLA_GRE_IFLAGS */
1454 nla_total_size(2) +
1455 /* IFLA_GRE_OFLAGS */
1456 nla_total_size(2) +
1457 /* IFLA_GRE_IKEY */
1458 nla_total_size(4) +
1459 /* IFLA_GRE_OKEY */
1460 nla_total_size(4) +
1461 /* IFLA_GRE_LOCAL */
Nicolas Dichtela3754132012-11-09 05:34:56 +00001462 nla_total_size(sizeof(struct in6_addr)) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001463 /* IFLA_GRE_REMOTE */
Nicolas Dichtela3754132012-11-09 05:34:56 +00001464 nla_total_size(sizeof(struct in6_addr)) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001465 /* IFLA_GRE_TTL */
1466 nla_total_size(1) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001467 /* IFLA_GRE_ENCAP_LIMIT */
1468 nla_total_size(1) +
1469 /* IFLA_GRE_FLOWINFO */
1470 nla_total_size(4) +
1471 /* IFLA_GRE_FLAGS */
1472 nla_total_size(4) +
Tom Herbert1faf3d92016-05-18 09:06:19 -07001473 /* IFLA_GRE_ENCAP_TYPE */
1474 nla_total_size(2) +
1475 /* IFLA_GRE_ENCAP_FLAGS */
1476 nla_total_size(2) +
1477 /* IFLA_GRE_ENCAP_SPORT */
1478 nla_total_size(2) +
1479 /* IFLA_GRE_ENCAP_DPORT */
1480 nla_total_size(2) +
Craig Gallek0a473b82017-04-19 12:30:53 -04001481 /* IFLA_GRE_FWMARK */
1482 nla_total_size(4) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001483 0;
1484}
1485
1486static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1487{
1488 struct ip6_tnl *t = netdev_priv(dev);
1489 struct __ip6_tnl_parm *p = &t->parms;
1490
1491 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001492 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1493 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1494 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1495 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001496 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1497 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
Jiri Benc930345e2015-03-29 16:59:25 +02001498 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1499 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001500 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001501 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1502 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
Craig Gallek0a473b82017-04-19 12:30:53 -04001503 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1504 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001505 goto nla_put_failure;
Tom Herbert1faf3d92016-05-18 09:06:19 -07001506
1507 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1508 t->encap.type) ||
1509 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1510 t->encap.sport) ||
1511 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1512 t->encap.dport) ||
1513 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1514 t->encap.flags))
1515 goto nla_put_failure;
1516
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001517 return 0;
1518
1519nla_put_failure:
1520 return -EMSGSIZE;
1521}
1522
1523static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1524 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1525 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1526 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1527 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1528 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1529 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1530 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1531 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1532 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1533 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1534 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
Tom Herbert1faf3d92016-05-18 09:06:19 -07001535 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1536 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1537 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1538 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
Craig Gallek0a473b82017-04-19 12:30:53 -04001539 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001540};
1541
1542static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1543 .kind = "ip6gre",
1544 .maxtype = IFLA_GRE_MAX,
1545 .policy = ip6gre_policy,
1546 .priv_size = sizeof(struct ip6_tnl),
1547 .setup = ip6gre_tunnel_setup,
1548 .validate = ip6gre_tunnel_validate,
1549 .newlink = ip6gre_newlink,
1550 .changelink = ip6gre_changelink,
Nicolas Dichtel54d63f782014-04-14 17:11:38 +02001551 .dellink = ip6gre_dellink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001552 .get_size = ip6gre_get_size,
1553 .fill_info = ip6gre_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001554 .get_link_net = ip6_tnl_get_link_net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001555};
1556
1557static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1558 .kind = "ip6gretap",
1559 .maxtype = IFLA_GRE_MAX,
1560 .policy = ip6gre_policy,
1561 .priv_size = sizeof(struct ip6_tnl),
1562 .setup = ip6gre_tap_setup,
1563 .validate = ip6gre_tap_validate,
1564 .newlink = ip6gre_newlink,
1565 .changelink = ip6gre_changelink,
1566 .get_size = ip6gre_get_size,
1567 .fill_info = ip6gre_fill_info,
Nicolas Dichtel3390e392015-01-20 15:15:43 +01001568 .get_link_net = ip6_tnl_get_link_net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001569};
1570
1571/*
1572 * And now the modules code and kernel interface.
1573 */
1574
1575static int __init ip6gre_init(void)
1576{
1577 int err;
1578
1579 pr_info("GRE over IPv6 tunneling driver\n");
1580
1581 err = register_pernet_device(&ip6gre_net_ops);
1582 if (err < 0)
1583 return err;
1584
1585 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1586 if (err < 0) {
1587 pr_info("%s: can't add protocol\n", __func__);
1588 goto add_proto_failed;
1589 }
1590
1591 err = rtnl_link_register(&ip6gre_link_ops);
1592 if (err < 0)
1593 goto rtnl_link_failed;
1594
1595 err = rtnl_link_register(&ip6gre_tap_ops);
1596 if (err < 0)
1597 goto tap_ops_failed;
1598
1599out:
1600 return err;
1601
1602tap_ops_failed:
1603 rtnl_link_unregister(&ip6gre_link_ops);
1604rtnl_link_failed:
1605 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1606add_proto_failed:
1607 unregister_pernet_device(&ip6gre_net_ops);
1608 goto out;
1609}
1610
1611static void __exit ip6gre_fini(void)
1612{
1613 rtnl_link_unregister(&ip6gre_tap_ops);
1614 rtnl_link_unregister(&ip6gre_link_ops);
1615 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1616 unregister_pernet_device(&ip6gre_net_ops);
1617}
1618
1619module_init(ip6gre_init);
1620module_exit(ip6gre_fini);
1621MODULE_LICENSE("GPL");
1622MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1623MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1624MODULE_ALIAS_RTNL_LINK("ip6gre");
Nicolas Dichtel5a4ee9a2014-09-24 11:03:00 +02001625MODULE_ALIAS_RTNL_LINK("ip6gretap");
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001626MODULE_ALIAS_NETDEV("ip6gre0");