blob: fac820b121aec84ff689e84a8905baa5902c4251 [file] [log] [blame]
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>
William Tu5a963eb2017-11-30 11:51:29 -080058#include <net/erspan.h>
William Tu6712abc2017-12-01 15:26:08 -080059#include <net/dst_metadata.h>
xeb@mail.ruc12b3952012-08-10 00:51:50 +000060
61
stephen hemmingereccc1bb2012-09-25 11:02:48 +000062static bool log_ecn_error = true;
63module_param(log_ecn_error, bool, 0644);
64MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
65
Jiri Kosinae87a8f22016-08-10 11:03:35 +020066#define IP6_GRE_HASH_SIZE_SHIFT 5
67#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
xeb@mail.ruc12b3952012-08-10 00:51:50 +000068
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030069static unsigned int ip6gre_net_id __read_mostly;
xeb@mail.ruc12b3952012-08-10 00:51:50 +000070struct ip6gre_net {
Jiri Kosinae87a8f22016-08-10 11:03:35 +020071 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
xeb@mail.ruc12b3952012-08-10 00:51:50 +000072
William Tu6712abc2017-12-01 15:26:08 -080073 struct ip6_tnl __rcu *collect_md_tun;
xeb@mail.ruc12b3952012-08-10 00:51:50 +000074 struct net_device *fb_tunnel_dev;
75};
76
77static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
Nicolas Dichtel22f08062014-04-22 10:15:24 +020078static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
William Tu5a963eb2017-11-30 11:51:29 -080079static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
xeb@mail.ruc12b3952012-08-10 00:51:50 +000080static int ip6gre_tunnel_init(struct net_device *dev);
81static void ip6gre_tunnel_setup(struct net_device *dev);
82static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
83static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
84
85/* Tunnel hash table */
86
87/*
88 4 hash tables:
89
90 3: (remote,local)
91 2: (remote,*)
92 1: (*,local)
93 0: (*,*)
94
95 We require exact key match i.e. if a key is present in packet
96 it will match only tunnel with the same key; if it is not present,
97 it will match only keyless tunnel.
98
99 All keysless packets, if not matched configured keyless tunnels
100 will match fallback tunnel.
101 */
102
Jiri Kosinae87a8f22016-08-10 11:03:35 +0200103#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000104static u32 HASH_ADDR(const struct in6_addr *addr)
105{
106 u32 hash = ipv6_addr_hash(addr);
107
Jiri Kosinae87a8f22016-08-10 11:03:35 +0200108 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000109}
110
111#define tunnels_r_l tunnels[3]
112#define tunnels_r tunnels[2]
113#define tunnels_l tunnels[1]
114#define tunnels_wc tunnels[0]
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000115
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000116/* Given src, dst and key, find appropriate for input tunnel. */
117
118static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
119 const struct in6_addr *remote, const struct in6_addr *local,
120 __be32 key, __be16 gre_proto)
121{
122 struct net *net = dev_net(dev);
123 int link = dev->ifindex;
124 unsigned int h0 = HASH_ADDR(remote);
125 unsigned int h1 = HASH_KEY(key);
126 struct ip6_tnl *t, *cand = NULL;
127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
William Tu5a963eb2017-11-30 11:51:29 -0800128 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
William Tu3b04caa2018-03-09 07:34:40 -0800129 gre_proto == htons(ETH_P_ERSPAN) ||
130 gre_proto == htons(ETH_P_ERSPAN2)) ?
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000131 ARPHRD_ETHER : ARPHRD_IP6GRE;
132 int score, cand_score = 4;
133
Amerigo Wange086cad2012-11-11 21:52:34 +0000134 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000135 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
136 !ipv6_addr_equal(remote, &t->parms.raddr) ||
137 key != t->parms.i_key ||
138 !(t->dev->flags & IFF_UP))
139 continue;
140
141 if (t->dev->type != ARPHRD_IP6GRE &&
142 t->dev->type != dev_type)
143 continue;
144
145 score = 0;
146 if (t->parms.link != link)
147 score |= 1;
148 if (t->dev->type != dev_type)
149 score |= 2;
150 if (score == 0)
151 return t;
152
153 if (score < cand_score) {
154 cand = t;
155 cand_score = score;
156 }
157 }
158
Amerigo Wange086cad2012-11-11 21:52:34 +0000159 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000160 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
161 key != t->parms.i_key ||
162 !(t->dev->flags & IFF_UP))
163 continue;
164
165 if (t->dev->type != ARPHRD_IP6GRE &&
166 t->dev->type != dev_type)
167 continue;
168
169 score = 0;
170 if (t->parms.link != link)
171 score |= 1;
172 if (t->dev->type != dev_type)
173 score |= 2;
174 if (score == 0)
175 return t;
176
177 if (score < cand_score) {
178 cand = t;
179 cand_score = score;
180 }
181 }
182
Amerigo Wange086cad2012-11-11 21:52:34 +0000183 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000184 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
185 (!ipv6_addr_equal(local, &t->parms.raddr) ||
186 !ipv6_addr_is_multicast(local))) ||
187 key != t->parms.i_key ||
188 !(t->dev->flags & IFF_UP))
189 continue;
190
191 if (t->dev->type != ARPHRD_IP6GRE &&
192 t->dev->type != dev_type)
193 continue;
194
195 score = 0;
196 if (t->parms.link != link)
197 score |= 1;
198 if (t->dev->type != dev_type)
199 score |= 2;
200 if (score == 0)
201 return t;
202
203 if (score < cand_score) {
204 cand = t;
205 cand_score = score;
206 }
207 }
208
Amerigo Wange086cad2012-11-11 21:52:34 +0000209 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000210 if (t->parms.i_key != key ||
211 !(t->dev->flags & IFF_UP))
212 continue;
213
214 if (t->dev->type != ARPHRD_IP6GRE &&
215 t->dev->type != dev_type)
216 continue;
217
218 score = 0;
219 if (t->parms.link != link)
220 score |= 1;
221 if (t->dev->type != dev_type)
222 score |= 2;
223 if (score == 0)
224 return t;
225
226 if (score < cand_score) {
227 cand = t;
228 cand_score = score;
229 }
230 }
231
Ian Morris53b24b82015-03-29 14:00:05 +0100232 if (cand)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000233 return cand;
234
William Tu6712abc2017-12-01 15:26:08 -0800235 t = rcu_dereference(ign->collect_md_tun);
236 if (t && t->dev->flags & IFF_UP)
237 return t;
238
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000239 dev = ign->fb_tunnel_dev;
Eric Dumazet79134e62018-03-08 12:51:41 -0800240 if (dev && dev->flags & IFF_UP)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000241 return netdev_priv(dev);
242
243 return NULL;
244}
245
246static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
247 const struct __ip6_tnl_parm *p)
248{
249 const struct in6_addr *remote = &p->raddr;
250 const struct in6_addr *local = &p->laddr;
251 unsigned int h = HASH_KEY(p->i_key);
252 int prio = 0;
253
254 if (!ipv6_addr_any(local))
255 prio |= 1;
256 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
257 prio |= 2;
258 h ^= HASH_ADDR(remote);
259 }
260
261 return &ign->tunnels[prio][h];
262}
263
264static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
265 const struct ip6_tnl *t)
266{
267 return __ip6gre_bucket(ign, &t->parms);
268}
269
270static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
271{
272 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
273
William Tu6712abc2017-12-01 15:26:08 -0800274 if (t->parms.collect_md)
275 rcu_assign_pointer(ign->collect_md_tun, t);
276
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000277 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
278 rcu_assign_pointer(*tp, t);
279}
280
281static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
282{
283 struct ip6_tnl __rcu **tp;
284 struct ip6_tnl *iter;
285
William Tu6712abc2017-12-01 15:26:08 -0800286 if (t->parms.collect_md)
287 rcu_assign_pointer(ign->collect_md_tun, NULL);
288
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000289 for (tp = ip6gre_bucket(ign, t);
290 (iter = rtnl_dereference(*tp)) != NULL;
291 tp = &iter->next) {
292 if (t == iter) {
293 rcu_assign_pointer(*tp, t->next);
294 break;
295 }
296 }
297}
298
299static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
300 const struct __ip6_tnl_parm *parms,
301 int type)
302{
303 const struct in6_addr *remote = &parms->raddr;
304 const struct in6_addr *local = &parms->laddr;
305 __be32 key = parms->i_key;
306 int link = parms->link;
307 struct ip6_tnl *t;
308 struct ip6_tnl __rcu **tp;
309 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
310
311 for (tp = __ip6gre_bucket(ign, parms);
312 (t = rtnl_dereference(*tp)) != NULL;
313 tp = &t->next)
314 if (ipv6_addr_equal(local, &t->parms.laddr) &&
315 ipv6_addr_equal(remote, &t->parms.raddr) &&
316 key == t->parms.i_key &&
317 link == t->parms.link &&
318 type == t->dev->type)
319 break;
320
321 return t;
322}
323
324static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
325 const struct __ip6_tnl_parm *parms, int create)
326{
327 struct ip6_tnl *t, *nt;
328 struct net_device *dev;
329 char name[IFNAMSIZ];
330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
331
332 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
Steffen Klassertcd0a0bd2014-09-22 10:07:26 +0200333 if (t && create)
334 return NULL;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000335 if (t || !create)
336 return t;
337
Eric Dumazet5f42df02018-04-05 06:39:29 -0700338 if (parms->name[0]) {
339 if (!dev_valid_name(parms->name))
340 return NULL;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000341 strlcpy(name, parms->name, IFNAMSIZ);
Eric Dumazet5f42df02018-04-05 06:39:29 -0700342 } else {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000343 strcpy(name, "ip6gre%d");
Eric Dumazet5f42df02018-04-05 06:39:29 -0700344 }
Tom Gundersenc835a672014-07-14 16:37:24 +0200345 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
346 ip6gre_tunnel_setup);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000347 if (!dev)
348 return NULL;
349
350 dev_net_set(dev, net);
351
352 nt = netdev_priv(dev);
353 nt->parms = *parms;
354 dev->rtnl_link_ops = &ip6gre_link_ops;
355
356 nt->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +0200357 nt->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000358
359 if (register_netdevice(dev) < 0)
360 goto failed_free;
361
Alexey Kodanev128bb972018-01-18 20:51:12 +0300362 ip6gre_tnl_link_config(nt, 1);
363
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000364 /* Can use a lockless transmit, unless we generate output sequences */
Tom Herbertb45bd1d2016-05-09 17:12:12 -0700365 if (!(nt->parms.o_flags & TUNNEL_SEQ))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000366 dev->features |= NETIF_F_LLTX;
367
368 dev_hold(dev);
369 ip6gre_tunnel_link(ign, nt);
370 return nt;
371
372failed_free:
373 free_netdev(dev);
374 return NULL;
375}
376
377static void ip6gre_tunnel_uninit(struct net_device *dev)
378{
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200379 struct ip6_tnl *t = netdev_priv(dev);
380 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000381
Nicolas Dichtel22f08062014-04-22 10:15:24 +0200382 ip6gre_tunnel_unlink(ign, t);
Paolo Abeni607f7252016-02-12 15:43:54 +0100383 dst_cache_reset(&t->dst_cache);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000384 dev_put(dev);
385}
386
387
388static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Eric Dumazet78920322017-02-04 23:18:55 -0800389 u8 type, u8 code, int offset, __be32 info)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000390{
Xin Long929fc032017-11-11 19:06:49 +0800391 struct net *net = dev_net(skb->dev);
Eric Dumazet78920322017-02-04 23:18:55 -0800392 const struct gre_base_hdr *greh;
393 const struct ipv6hdr *ipv6h;
394 int grehlen = sizeof(*greh);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000395 struct ip6_tnl *t;
Eric Dumazet78920322017-02-04 23:18:55 -0800396 int key_off = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000397 __be16 flags;
Eric Dumazet78920322017-02-04 23:18:55 -0800398 __be32 key;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000399
Eric Dumazet78920322017-02-04 23:18:55 -0800400 if (!pskb_may_pull(skb, offset + grehlen))
401 return;
402 greh = (const struct gre_base_hdr *)(skb->data + offset);
403 flags = greh->flags;
404 if (flags & (GRE_VERSION | GRE_ROUTING))
405 return;
406 if (flags & GRE_CSUM)
407 grehlen += 4;
408 if (flags & GRE_KEY) {
409 key_off = grehlen + offset;
410 grehlen += 4;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000411 }
412
Eric Dumazet78920322017-02-04 23:18:55 -0800413 if (!pskb_may_pull(skb, offset + grehlen))
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000414 return;
Eric Dumazetb87fb392012-08-19 03:47:30 +0000415 ipv6h = (const struct ipv6hdr *)skb->data;
Eric Dumazet78920322017-02-04 23:18:55 -0800416 greh = (const struct gre_base_hdr *)(skb->data + offset);
417 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000418
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000419 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
Eric Dumazet78920322017-02-04 23:18:55 -0800420 key, greh->protocol);
Ian Morris63159f22015-03-29 14:00:04 +0100421 if (!t)
stephen hemminger0c5794a2012-09-24 18:12:24 +0000422 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000423
424 switch (type) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000425 struct ipv6_tlv_tnl_enc_lim *tel;
Xin Longfe1a4ca2017-11-11 19:06:50 +0800426 __u32 teli;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000427 case ICMPV6_DEST_UNREACH:
Matt Bennetta46496c2015-09-23 16:58:31 +1200428 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
429 t->parms.name);
Xin Longf8d20b42017-10-26 19:23:27 +0800430 if (code != ICMPV6_PORT_UNREACH)
431 break;
432 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000433 case ICMPV6_TIME_EXCEED:
434 if (code == ICMPV6_EXC_HOPLIMIT) {
Matt Bennetta46496c2015-09-23 16:58:31 +1200435 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
436 t->parms.name);
Xin Longf8d20b42017-10-26 19:23:27 +0800437 break;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000438 }
Xin Longf8d20b42017-10-26 19:23:27 +0800439 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000440 case ICMPV6_PARAMPROB:
441 teli = 0;
442 if (code == ICMPV6_HDR_FIELD)
443 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
444
Sabrina Dubrocad1e158e2015-02-04 15:25:09 +0100445 if (teli && teli == be32_to_cpu(info) - 2) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000446 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
447 if (tel->encap_limit == 0) {
Matt Bennetta46496c2015-09-23 16:58:31 +1200448 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
449 t->parms.name);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000450 }
451 } else {
Matt Bennetta46496c2015-09-23 16:58:31 +1200452 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
453 t->parms.name);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000454 }
Xin Longf8d20b42017-10-26 19:23:27 +0800455 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000456 case ICMPV6_PKT_TOOBIG:
Xin Longfe1a4ca2017-11-11 19:06:50 +0800457 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
Xin Longf8d20b42017-10-26 19:23:27 +0800458 return;
Xin Long929fc032017-11-11 19:06:49 +0800459 case NDISC_REDIRECT:
460 ip6_redirect(skb, net, skb->dev->ifindex, 0,
461 sock_net_uid(net, NULL));
462 return;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000463 }
464
465 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
466 t->err_count++;
467 else
468 t->err_count = 1;
469 t->err_time = jiffies;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000470}
471
Tom Herbert308edfdf2016-04-29 17:12:17 -0700472static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000473{
474 const struct ipv6hdr *ipv6h;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000475 struct ip6_tnl *tunnel;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000476
477 ipv6h = ipv6_hdr(skb);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000478 tunnel = ip6gre_tunnel_lookup(skb->dev,
Tom Herbert308edfdf2016-04-29 17:12:17 -0700479 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
480 tpi->proto);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000481 if (tunnel) {
William Tu6712abc2017-12-01 15:26:08 -0800482 if (tunnel->parms.collect_md) {
483 struct metadata_dst *tun_dst;
484 __be64 tun_id;
485 __be16 flags;
486
487 flags = tpi->flags;
488 tun_id = key32_to_tunnel_id(tpi->key);
489
490 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
491 if (!tun_dst)
492 return PACKET_REJECT;
493
494 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
495 } else {
496 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
497 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000498
Tom Herbert308edfdf2016-04-29 17:12:17 -0700499 return PACKET_RCVD;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000500 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000501
Tom Herbert308edfdf2016-04-29 17:12:17 -0700502 return PACKET_REJECT;
503}
504
William Tu5a963eb2017-11-30 11:51:29 -0800505static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
506 struct tnl_ptk_info *tpi)
507{
William Tu1d7e2ed2017-12-13 16:38:55 -0800508 struct erspan_base_hdr *ershdr;
509 struct erspan_metadata *pkt_md;
William Tu5a963eb2017-11-30 11:51:29 -0800510 const struct ipv6hdr *ipv6h;
William Tu3df192832018-02-05 13:35:34 -0800511 struct erspan_md2 *md2;
William Tu5a963eb2017-11-30 11:51:29 -0800512 struct ip6_tnl *tunnel;
William Tu1d7e2ed2017-12-13 16:38:55 -0800513 u8 ver;
William Tu5a963eb2017-11-30 11:51:29 -0800514
William Tu5a963eb2017-11-30 11:51:29 -0800515 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
516 return PACKET_REJECT;
517
Haishuang Yan293a1992017-12-20 09:53:19 +0800518 ipv6h = ipv6_hdr(skb);
519 ershdr = (struct erspan_base_hdr *)skb->data;
William Tuc69de582018-01-25 13:20:09 -0800520 ver = ershdr->ver;
521 tpi->key = cpu_to_be32(get_session_id(ershdr));
William Tu5a963eb2017-11-30 11:51:29 -0800522
523 tunnel = ip6gre_tunnel_lookup(skb->dev,
524 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
525 tpi->proto);
526 if (tunnel) {
William Tu1d7e2ed2017-12-13 16:38:55 -0800527 int len = erspan_hdr_len(ver);
528
529 if (unlikely(!pskb_may_pull(skb, len)))
William Tuae3e1332017-12-15 14:27:43 -0800530 return PACKET_REJECT;
William Tu1d7e2ed2017-12-13 16:38:55 -0800531
William Tud91e8db52017-12-15 14:27:44 -0800532 ershdr = (struct erspan_base_hdr *)skb->data;
533 pkt_md = (struct erspan_metadata *)(ershdr + 1);
534
William Tu1d7e2ed2017-12-13 16:38:55 -0800535 if (__iptunnel_pull_header(skb, len,
William Tu5a963eb2017-11-30 11:51:29 -0800536 htons(ETH_P_TEB),
537 false, false) < 0)
538 return PACKET_REJECT;
539
William Tuef7baf52017-12-05 15:15:44 -0800540 if (tunnel->parms.collect_md) {
541 struct metadata_dst *tun_dst;
542 struct ip_tunnel_info *info;
543 struct erspan_metadata *md;
544 __be64 tun_id;
545 __be16 flags;
546
547 tpi->flags |= TUNNEL_KEY;
548 flags = tpi->flags;
549 tun_id = key32_to_tunnel_id(tpi->key);
550
551 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
552 sizeof(*md));
553 if (!tun_dst)
554 return PACKET_REJECT;
555
556 info = &tun_dst->u.tun_info;
557 md = ip_tunnel_info_opts(info);
William Tu94d7d8f2017-12-13 16:38:57 -0800558 md->version = ver;
William Tu3df192832018-02-05 13:35:34 -0800559 md2 = &md->u.md2;
560 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
561 ERSPAN_V2_MDSIZE);
William Tuef7baf52017-12-05 15:15:44 -0800562 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
563 info->options_len = sizeof(*md);
564
565 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
566
567 } else {
William Tuef7baf52017-12-05 15:15:44 -0800568 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
569 }
William Tu5a963eb2017-11-30 11:51:29 -0800570
571 return PACKET_RCVD;
572 }
573
574 return PACKET_REJECT;
575}
576
Tom Herbert308edfdf2016-04-29 17:12:17 -0700577static int gre_rcv(struct sk_buff *skb)
578{
579 struct tnl_ptk_info tpi;
580 bool csum_err = false;
581 int hdr_len;
582
Eric Dumazete582615ad2016-06-15 06:24:00 -0700583 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
Jiri Bencf132ae72016-05-03 15:00:21 +0200584 if (hdr_len < 0)
Tom Herbert308edfdf2016-04-29 17:12:17 -0700585 goto drop;
586
587 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
588 goto drop;
589
William Tu94d7d8f2017-12-13 16:38:57 -0800590 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
591 tpi.proto == htons(ETH_P_ERSPAN2))) {
William Tu5a963eb2017-11-30 11:51:29 -0800592 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
593 return 0;
Haishuang Yana7343212017-12-20 10:21:47 +0800594 goto out;
William Tu5a963eb2017-11-30 11:51:29 -0800595 }
596
Tom Herbert308edfdf2016-04-29 17:12:17 -0700597 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
598 return 0;
599
Haishuang Yana7343212017-12-20 10:21:47 +0800600out:
Tom Herbert308edfdf2016-04-29 17:12:17 -0700601 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000602drop:
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000603 kfree_skb(skb);
604 return 0;
605}
606
Tom Herbertb05229f2016-04-29 17:12:21 -0700607static int gre_handle_offloads(struct sk_buff *skb, bool csum)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000608{
Tom Herbertb05229f2016-04-29 17:12:21 -0700609 return iptunnel_handle_offloads(skb,
610 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000611}
612
William Tu898b29792017-11-30 11:51:28 -0800613static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
614 struct net_device *dev,
615 struct flowi6 *fl6, __u8 *dsfield,
616 int *encap_limit)
617{
618 const struct iphdr *iph = ip_hdr(skb);
619 struct ip6_tnl *t = netdev_priv(dev);
620
621 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
622 *encap_limit = t->parms.encap_limit;
623
624 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
625
626 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
627 *dsfield = ipv4_get_dsfield(iph);
628 else
629 *dsfield = ip6_tclass(t->parms.flowinfo);
630
631 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
632 fl6->flowi6_mark = skb->mark;
633 else
634 fl6->flowi6_mark = t->parms.fwmark;
635
636 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
637}
638
639static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
640 struct net_device *dev,
641 struct flowi6 *fl6, __u8 *dsfield,
642 int *encap_limit)
643{
644 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
645 struct ip6_tnl *t = netdev_priv(dev);
646 __u16 offset;
647
648 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
649 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
650
651 if (offset > 0) {
652 struct ipv6_tlv_tnl_enc_lim *tel;
653
654 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
655 if (tel->encap_limit == 0) {
656 icmpv6_send(skb, ICMPV6_PARAMPROB,
657 ICMPV6_HDR_FIELD, offset + 2);
658 return -1;
659 }
660 *encap_limit = tel->encap_limit - 1;
661 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
662 *encap_limit = t->parms.encap_limit;
663 }
664
665 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
666
667 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
668 *dsfield = ipv6_get_dsfield(ipv6h);
669 else
670 *dsfield = ip6_tclass(t->parms.flowinfo);
671
672 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
673 fl6->flowlabel |= ip6_flowlabel(ipv6h);
674
675 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
676 fl6->flowi6_mark = skb->mark;
677 else
678 fl6->flowi6_mark = t->parms.fwmark;
679
680 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
681
682 return 0;
683}
684
Tom Herbertb05229f2016-04-29 17:12:21 -0700685static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
686 struct net_device *dev, __u8 dsfield,
687 struct flowi6 *fl6, int encap_limit,
688 __u32 *pmtu, __be16 proto)
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000689{
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000690 struct ip6_tnl *tunnel = netdev_priv(dev);
Xin Long8aec4952017-10-26 19:27:17 +0800691 __be16 protocol;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000692
693 if (dev->type == ARPHRD_ETHER)
694 IPCB(skb)->flags = 0;
695
Tom Herbertb05229f2016-04-29 17:12:21 -0700696 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
697 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
698 else
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000699 fl6->daddr = tunnel->parms.raddr;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000700
Petr Machata01b8d062018-05-17 16:36:10 +0200701 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
702 return -ENOMEM;
703
Tom Herbertb05229f2016-04-29 17:12:21 -0700704 /* Push GRE header. */
Xin Long8aec4952017-10-26 19:27:17 +0800705 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
William Tu6712abc2017-12-01 15:26:08 -0800706
707 if (tunnel->parms.collect_md) {
708 struct ip_tunnel_info *tun_info;
709 const struct ip_tunnel_key *key;
710 __be16 flags;
711
712 tun_info = skb_tunnel_info(skb);
713 if (unlikely(!tun_info ||
714 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
715 ip_tunnel_info_af(tun_info) != AF_INET6))
716 return -EINVAL;
717
718 key = &tun_info->key;
719 memset(fl6, 0, sizeof(*fl6));
720 fl6->flowi6_proto = IPPROTO_GRE;
721 fl6->daddr = key->u.ipv6.dst;
722 fl6->flowlabel = key->label;
723 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
724
725 dsfield = key->tos;
William Tu77a51962018-03-01 13:49:57 -0800726 flags = key->tun_flags &
727 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
William Tu6712abc2017-12-01 15:26:08 -0800728 tunnel->tun_hlen = gre_calc_hlen(flags);
729
730 gre_build_header(skb, tunnel->tun_hlen,
731 flags, protocol,
William Tu77a51962018-03-01 13:49:57 -0800732 tunnel_id_to_key32(tun_info->key.tun_id),
Colin Ian King15746392018-03-21 19:34:58 +0000733 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
William Tu77a51962018-03-01 13:49:57 -0800734 : 0);
William Tu6712abc2017-12-01 15:26:08 -0800735
736 } else {
William Tu77a51962018-03-01 13:49:57 -0800737 if (tunnel->parms.o_flags & TUNNEL_SEQ)
738 tunnel->o_seqno++;
739
William Tu6712abc2017-12-01 15:26:08 -0800740 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
741 protocol, tunnel->parms.o_key,
742 htonl(tunnel->o_seqno));
743 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000744
Tom Herbertb05229f2016-04-29 17:12:21 -0700745 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
746 NEXTHDR_GRE);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000747}
748
749static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
750{
751 struct ip6_tnl *t = netdev_priv(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000752 int encap_limit = -1;
753 struct flowi6 fl6;
William Tu6712abc2017-12-01 15:26:08 -0800754 __u8 dsfield = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000755 __u32 mtu;
756 int err;
757
Bernie Harris5146d1f2016-02-22 12:58:05 +1300758 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
759
William Tu6712abc2017-12-01 15:26:08 -0800760 if (!t->parms.collect_md)
761 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
762 &dsfield, &encap_limit);
Lorenzo Colittie2d118a2016-11-04 02:23:43 +0900763
Tom Herbertb05229f2016-04-29 17:12:21 -0700764 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
765 if (err)
766 return -1;
767
768 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
769 skb->protocol);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000770 if (err != 0) {
771 /* XXX: send ICMP error even if DF is not set. */
772 if (err == -EMSGSIZE)
773 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
774 htonl(mtu));
775 return -1;
776 }
777
778 return 0;
779}
780
781static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
782{
783 struct ip6_tnl *t = netdev_priv(dev);
784 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
785 int encap_limit = -1;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000786 struct flowi6 fl6;
William Tu6712abc2017-12-01 15:26:08 -0800787 __u8 dsfield = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000788 __u32 mtu;
789 int err;
790
791 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
792 return -1;
793
William Tu6712abc2017-12-01 15:26:08 -0800794 if (!t->parms.collect_md &&
795 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
William Tu898b29792017-11-30 11:51:28 -0800796 return -1;
Lorenzo Colittie2d118a2016-11-04 02:23:43 +0900797
Tom Herbertb05229f2016-04-29 17:12:21 -0700798 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
799 return -1;
800
801 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
802 &mtu, skb->protocol);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000803 if (err != 0) {
804 if (err == -EMSGSIZE)
805 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
806 return -1;
807 }
808
809 return 0;
810}
811
812/**
813 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
814 * @t: the outgoing tunnel device
815 * @hdr: IPv6 header from the incoming packet
816 *
817 * Description:
818 * Avoid trivial tunneling loop by checking that tunnel exit-point
819 * doesn't match source of incoming packet.
820 *
821 * Return:
822 * 1 if conflict,
823 * 0 else
824 **/
825
826static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
827 const struct ipv6hdr *hdr)
828{
829 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
830}
831
832static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
833{
834 struct ip6_tnl *t = netdev_priv(dev);
835 int encap_limit = -1;
836 struct flowi6 fl6;
837 __u32 mtu;
838 int err;
839
840 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
841 encap_limit = t->parms.encap_limit;
842
William Tu6712abc2017-12-01 15:26:08 -0800843 if (!t->parms.collect_md)
844 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000845
Tom Herbertb05229f2016-04-29 17:12:21 -0700846 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
847 if (err)
848 return err;
849
850 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000851
852 return err;
853}
854
855static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
856 struct net_device *dev)
857{
858 struct ip6_tnl *t = netdev_priv(dev);
859 struct net_device_stats *stats = &t->dev->stats;
860 int ret;
861
Steffen Klassertd5005142014-11-05 08:02:48 +0100862 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
Tommi Rantala41ab3e32013-02-06 03:24:02 +0000863 goto tx_err;
xeb@mail.ruc12b3952012-08-10 00:51:50 +0000864
865 switch (skb->protocol) {
866 case htons(ETH_P_IP):
867 ret = ip6gre_xmit_ipv4(skb, dev);
868 break;
869 case htons(ETH_P_IPV6):
870 ret = ip6gre_xmit_ipv6(skb, dev);
871 break;
872 default:
873 ret = ip6gre_xmit_other(skb, dev);
874 break;
875 }
876
877 if (ret < 0)
878 goto tx_err;
879
880 return NETDEV_TX_OK;
881
882tx_err:
883 stats->tx_errors++;
884 stats->tx_dropped++;
885 kfree_skb(skb);
886 return NETDEV_TX_OK;
887}
888
William Tu5a963eb2017-11-30 11:51:29 -0800889static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
890 struct net_device *dev)
891{
892 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
893 struct ip6_tnl *t = netdev_priv(dev);
894 struct dst_entry *dst = skb_dst(skb);
895 struct net_device_stats *stats;
896 bool truncate = false;
897 int encap_limit = -1;
898 __u8 dsfield = false;
899 struct flowi6 fl6;
900 int err = -EINVAL;
901 __u32 mtu;
902
903 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
904 goto tx_err;
905
906 if (gre_handle_offloads(skb, false))
907 goto tx_err;
908
William Tu5a963eb2017-11-30 11:51:29 -0800909 if (skb->len > dev->mtu + dev->hard_header_len) {
910 pskb_trim(skb, dev->mtu + dev->hard_header_len);
911 truncate = true;
912 }
913
Petr Machata56914842018-05-17 16:36:15 +0200914 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
William Tue41c7c62018-03-09 07:34:42 -0800915 goto tx_err;
916
William Tu5a963eb2017-11-30 11:51:29 -0800917 t->parms.o_flags &= ~TUNNEL_KEY;
William Tu5a963eb2017-11-30 11:51:29 -0800918 IPCB(skb)->flags = 0;
William Tuef7baf52017-12-05 15:15:44 -0800919
920 /* For collect_md mode, derive fl6 from the tunnel key,
921 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
922 */
923 if (t->parms.collect_md) {
924 struct ip_tunnel_info *tun_info;
925 const struct ip_tunnel_key *key;
926 struct erspan_metadata *md;
William Tuc69de582018-01-25 13:20:09 -0800927 __be32 tun_id;
William Tuef7baf52017-12-05 15:15:44 -0800928
929 tun_info = skb_tunnel_info(skb);
930 if (unlikely(!tun_info ||
931 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
932 ip_tunnel_info_af(tun_info) != AF_INET6))
933 return -EINVAL;
934
935 key = &tun_info->key;
936 memset(&fl6, 0, sizeof(fl6));
937 fl6.flowi6_proto = IPPROTO_GRE;
938 fl6.daddr = key->u.ipv6.dst;
939 fl6.flowlabel = key->label;
940 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
941
942 dsfield = key->tos;
943 md = ip_tunnel_info_opts(tun_info);
944 if (!md)
945 goto tx_err;
946
William Tuc69de582018-01-25 13:20:09 -0800947 tun_id = tunnel_id_to_key32(key->tun_id);
William Tu94d7d8f2017-12-13 16:38:57 -0800948 if (md->version == 1) {
949 erspan_build_header(skb,
William Tuc69de582018-01-25 13:20:09 -0800950 ntohl(tun_id),
William Tu94d7d8f2017-12-13 16:38:57 -0800951 ntohl(md->u.index), truncate,
952 false);
953 } else if (md->version == 2) {
William Tu94d7d8f2017-12-13 16:38:57 -0800954 erspan_build_header_v2(skb,
William Tuc69de582018-01-25 13:20:09 -0800955 ntohl(tun_id),
956 md->u.md2.dir,
957 get_hwid(&md->u.md2),
958 truncate, false);
William Tud6aa7112018-03-09 07:34:41 -0800959 } else {
960 goto tx_err;
William Tu94d7d8f2017-12-13 16:38:57 -0800961 }
William Tuef7baf52017-12-05 15:15:44 -0800962 } else {
963 switch (skb->protocol) {
964 case htons(ETH_P_IP):
965 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
966 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
967 &dsfield, &encap_limit);
968 break;
969 case htons(ETH_P_IPV6):
970 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
971 goto tx_err;
972 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
973 &dsfield, &encap_limit))
974 goto tx_err;
975 break;
976 default:
977 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
978 break;
979 }
980
William Tu94d7d8f2017-12-13 16:38:57 -0800981 if (t->parms.erspan_ver == 1)
William Tuc69de582018-01-25 13:20:09 -0800982 erspan_build_header(skb, ntohl(t->parms.o_key),
William Tu94d7d8f2017-12-13 16:38:57 -0800983 t->parms.index,
984 truncate, false);
William Tu02f99df2018-05-16 17:24:32 -0700985 else if (t->parms.erspan_ver == 2)
William Tuc69de582018-01-25 13:20:09 -0800986 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
William Tu94d7d8f2017-12-13 16:38:57 -0800987 t->parms.dir,
988 t->parms.hwid,
989 truncate, false);
William Tu02f99df2018-05-16 17:24:32 -0700990 else
991 goto tx_err;
992
William Tuef7baf52017-12-05 15:15:44 -0800993 fl6.daddr = t->parms.raddr;
994 }
William Tu5a963eb2017-11-30 11:51:29 -0800995
996 /* Push GRE header. */
997 gre_build_header(skb, 8, TUNNEL_SEQ,
998 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
999
1000 /* TooBig packet may have updated dst->dev's mtu */
William Tuef7baf52017-12-05 15:15:44 -08001001 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
William Tu5a963eb2017-11-30 11:51:29 -08001002 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1003
1004 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1005 NEXTHDR_GRE);
1006 if (err != 0) {
1007 /* XXX: send ICMP error even if DF is not set. */
1008 if (err == -EMSGSIZE) {
1009 if (skb->protocol == htons(ETH_P_IP))
1010 icmp_send(skb, ICMP_DEST_UNREACH,
1011 ICMP_FRAG_NEEDED, htonl(mtu));
1012 else
1013 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1014 }
1015
1016 goto tx_err;
1017 }
1018 return NETDEV_TX_OK;
1019
1020tx_err:
1021 stats = &t->dev->stats;
1022 stats->tx_errors++;
1023 stats->tx_dropped++;
1024 kfree_skb(skb);
1025 return NETDEV_TX_OK;
1026}
1027
Petr Machataa4833732018-05-17 16:36:27 +02001028static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001029{
1030 struct net_device *dev = t->dev;
1031 struct __ip6_tnl_parm *p = &t->parms;
1032 struct flowi6 *fl6 = &t->fl.u.ip6;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001033
1034 if (dev->type != ARPHRD_ETHER) {
1035 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1036 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1037 }
1038
1039 /* Set up flowi template */
1040 fl6->saddr = p->laddr;
1041 fl6->daddr = p->raddr;
1042 fl6->flowi6_oif = p->link;
1043 fl6->flowlabel = 0;
Haishuang Yan252f3f52016-05-21 18:17:35 +08001044 fl6->flowi6_proto = IPPROTO_GRE;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001045
1046 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1047 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1048 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1049 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1050
1051 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1052 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1053
1054 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1055 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1056 dev->flags |= IFF_POINTOPOINT;
1057 else
1058 dev->flags &= ~IFF_POINTOPOINT;
Petr Machataa4833732018-05-17 16:36:27 +02001059}
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001060
Petr Machataa4833732018-05-17 16:36:27 +02001061static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1062 int t_hlen)
1063{
1064 const struct __ip6_tnl_parm *p = &t->parms;
1065 struct net_device *dev = t->dev;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001066
1067 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1068 int strict = (ipv6_addr_type(&p->raddr) &
1069 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1070
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001071 struct rt6_info *rt = rt6_lookup(t->net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001072 &p->raddr, &p->laddr,
David Ahernb75cc8f2018-03-02 08:32:17 -08001073 p->link, NULL, strict);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001074
Ian Morris63159f22015-03-29 14:00:04 +01001075 if (!rt)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001076 return;
1077
1078 if (rt->dst.dev) {
Tom Herbertdb2ec952016-05-09 17:12:08 -07001079 dev->hard_header_len = rt->dst.dev->hard_header_len +
1080 t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001081
1082 if (set_mtu) {
Tom Herbertdb2ec952016-05-09 17:12:08 -07001083 dev->mtu = rt->dst.dev->mtu - t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001084 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1085 dev->mtu -= 8;
Alexander Duycka9e242c2016-04-14 15:33:45 -04001086 if (dev->type == ARPHRD_ETHER)
1087 dev->mtu -= ETH_HLEN;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001088
1089 if (dev->mtu < IPV6_MIN_MTU)
1090 dev->mtu = IPV6_MIN_MTU;
1091 }
1092 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00001093 ip6_rt_put(rt);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001094 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001095}
1096
Petr Machataa4833732018-05-17 16:36:27 +02001097static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1098{
1099 int t_hlen;
1100
1101 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1102 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1103
1104 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1105 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1106 return t_hlen;
1107}
1108
1109static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1110{
1111 ip6gre_tnl_link_config_common(t);
1112 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1113}
1114
Petr Machataa6465352018-05-17 16:36:33 +02001115static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1116 const struct __ip6_tnl_parm *p)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001117{
1118 t->parms.laddr = p->laddr;
1119 t->parms.raddr = p->raddr;
1120 t->parms.flags = p->flags;
1121 t->parms.hop_limit = p->hop_limit;
1122 t->parms.encap_limit = p->encap_limit;
1123 t->parms.flowinfo = p->flowinfo;
1124 t->parms.link = p->link;
1125 t->parms.proto = p->proto;
1126 t->parms.i_key = p->i_key;
1127 t->parms.o_key = p->o_key;
1128 t->parms.i_flags = p->i_flags;
1129 t->parms.o_flags = p->o_flags;
Craig Gallek0a473b82017-04-19 12:30:53 -04001130 t->parms.fwmark = p->fwmark;
Paolo Abeni607f7252016-02-12 15:43:54 +01001131 dst_cache_reset(&t->dst_cache);
Petr Machataa6465352018-05-17 16:36:33 +02001132}
1133
1134static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1135 int set_mtu)
1136{
1137 ip6gre_tnl_copy_tnl_parm(t, p);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001138 ip6gre_tnl_link_config(t, set_mtu);
1139 return 0;
1140}
1141
1142static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1143 const struct ip6_tnl_parm2 *u)
1144{
1145 p->laddr = u->laddr;
1146 p->raddr = u->raddr;
1147 p->flags = u->flags;
1148 p->hop_limit = u->hop_limit;
1149 p->encap_limit = u->encap_limit;
1150 p->flowinfo = u->flowinfo;
1151 p->link = u->link;
1152 p->i_key = u->i_key;
1153 p->o_key = u->o_key;
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001154 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1155 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001156 memcpy(p->name, u->name, sizeof(u->name));
1157}
1158
1159static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1160 const struct __ip6_tnl_parm *p)
1161{
1162 u->proto = IPPROTO_GRE;
1163 u->laddr = p->laddr;
1164 u->raddr = p->raddr;
1165 u->flags = p->flags;
1166 u->hop_limit = p->hop_limit;
1167 u->encap_limit = p->encap_limit;
1168 u->flowinfo = p->flowinfo;
1169 u->link = p->link;
1170 u->i_key = p->i_key;
1171 u->o_key = p->o_key;
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001172 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1173 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001174 memcpy(u->name, p->name, sizeof(u->name));
1175}
1176
1177static int ip6gre_tunnel_ioctl(struct net_device *dev,
1178 struct ifreq *ifr, int cmd)
1179{
1180 int err = 0;
1181 struct ip6_tnl_parm2 p;
1182 struct __ip6_tnl_parm p1;
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001183 struct ip6_tnl *t = netdev_priv(dev);
1184 struct net *net = t->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001185 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1186
Tom Herbert308edfdf2016-04-29 17:12:17 -07001187 memset(&p1, 0, sizeof(p1));
1188
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001189 switch (cmd) {
1190 case SIOCGETTUNNEL:
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001191 if (dev == ign->fb_tunnel_dev) {
1192 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1193 err = -EFAULT;
1194 break;
1195 }
1196 ip6gre_tnl_parm_from_user(&p1, &p);
1197 t = ip6gre_tunnel_locate(net, &p1, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001198 if (!t)
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001199 t = netdev_priv(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001200 }
Amerigo Wang5dbd5062013-05-09 21:56:37 +00001201 memset(&p, 0, sizeof(p));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001202 ip6gre_tnl_parm_to_user(&p, &t->parms);
1203 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1204 err = -EFAULT;
1205 break;
1206
1207 case SIOCADDTUNNEL:
1208 case SIOCCHGTUNNEL:
1209 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001210 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001211 goto done;
1212
1213 err = -EFAULT;
1214 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1215 goto done;
1216
1217 err = -EINVAL;
1218 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1219 goto done;
1220
1221 if (!(p.i_flags&GRE_KEY))
1222 p.i_key = 0;
1223 if (!(p.o_flags&GRE_KEY))
1224 p.o_key = 0;
1225
1226 ip6gre_tnl_parm_from_user(&p1, &p);
1227 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1228
1229 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Ian Morris53b24b82015-03-29 14:00:05 +01001230 if (t) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001231 if (t->dev != dev) {
1232 err = -EEXIST;
1233 break;
1234 }
1235 } else {
1236 t = netdev_priv(dev);
1237
1238 ip6gre_tunnel_unlink(ign, t);
1239 synchronize_net();
1240 ip6gre_tnl_change(t, &p1, 1);
1241 ip6gre_tunnel_link(ign, t);
1242 netdev_state_change(dev);
1243 }
1244 }
1245
1246 if (t) {
1247 err = 0;
1248
Amerigo Wang5dbd5062013-05-09 21:56:37 +00001249 memset(&p, 0, sizeof(p));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001250 ip6gre_tnl_parm_to_user(&p, &t->parms);
1251 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1252 err = -EFAULT;
1253 } else
1254 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1255 break;
1256
1257 case SIOCDELTUNNEL:
1258 err = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00001259 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001260 goto done;
1261
1262 if (dev == ign->fb_tunnel_dev) {
1263 err = -EFAULT;
1264 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1265 goto done;
1266 err = -ENOENT;
1267 ip6gre_tnl_parm_from_user(&p1, &p);
1268 t = ip6gre_tunnel_locate(net, &p1, 0);
Ian Morris63159f22015-03-29 14:00:04 +01001269 if (!t)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001270 goto done;
1271 err = -EPERM;
1272 if (t == netdev_priv(ign->fb_tunnel_dev))
1273 goto done;
1274 dev = t->dev;
1275 }
1276 unregister_netdevice(dev);
1277 err = 0;
1278 break;
1279
1280 default:
1281 err = -EINVAL;
1282 }
1283
1284done:
1285 return err;
1286}
1287
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001288static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
Xin Long76cc0d32017-09-15 12:00:07 +08001289 unsigned short type, const void *daddr,
1290 const void *saddr, unsigned int len)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001291{
1292 struct ip6_tnl *t = netdev_priv(dev);
Xin Long76cc0d32017-09-15 12:00:07 +08001293 struct ipv6hdr *ipv6h;
1294 __be16 *p;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001295
Xin Long76cc0d32017-09-15 12:00:07 +08001296 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1297 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1298 t->fl.u.ip6.flowlabel,
1299 true, &t->fl.u.ip6));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001300 ipv6h->hop_limit = t->parms.hop_limit;
1301 ipv6h->nexthdr = NEXTHDR_GRE;
1302 ipv6h->saddr = t->parms.laddr;
1303 ipv6h->daddr = t->parms.raddr;
1304
Xin Long76cc0d32017-09-15 12:00:07 +08001305 p = (__be16 *)(ipv6h + 1);
1306 p[0] = t->parms.o_flags;
1307 p[1] = htons(type);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001308
1309 /*
1310 * Set the source hardware address.
1311 */
1312
1313 if (saddr)
1314 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1315 if (daddr)
1316 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1317 if (!ipv6_addr_any(&ipv6h->daddr))
1318 return t->hlen;
1319
1320 return -t->hlen;
1321}
1322
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001323static const struct header_ops ip6gre_header_ops = {
1324 .create = ip6gre_header,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001325};
1326
1327static const struct net_device_ops ip6gre_netdev_ops = {
1328 .ndo_init = ip6gre_tunnel_init,
1329 .ndo_uninit = ip6gre_tunnel_uninit,
1330 .ndo_start_xmit = ip6gre_tunnel_xmit,
1331 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
Tom Herbertb05229f2016-04-29 17:12:21 -07001332 .ndo_change_mtu = ip6_tnl_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001333 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001334 .ndo_get_iflink = ip6_tnl_get_iflink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001335};
1336
1337static void ip6gre_dev_free(struct net_device *dev)
1338{
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001339 struct ip6_tnl *t = netdev_priv(dev);
1340
Paolo Abeni607f7252016-02-12 15:43:54 +01001341 dst_cache_destroy(&t->dst_cache);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001342 free_percpu(dev->tstats);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001343}
1344
1345static void ip6gre_tunnel_setup(struct net_device *dev)
1346{
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001347 dev->netdev_ops = &ip6gre_netdev_ops;
David S. Millercf124db2017-05-08 12:52:56 -04001348 dev->needs_free_netdev = true;
1349 dev->priv_destructor = ip6gre_dev_free;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001350
1351 dev->type = ARPHRD_IP6GRE;
Tom Herbertb05229f2016-04-29 17:12:21 -07001352
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001353 dev->flags |= IFF_NOARP;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001354 dev->addr_len = sizeof(struct in6_addr);
Eric Dumazet02875872014-10-05 18:38:35 -07001355 netif_keep_dst(dev);
Felix Jia45ce0fd2017-01-26 16:59:18 +13001356 /* This perm addr will be used as interface identifier by IPv6 */
1357 dev->addr_assign_type = NET_ADDR_RANDOM;
1358 eth_random_addr(dev->perm_addr);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001359}
1360
Alexey Kodaneve5a93362017-12-20 19:36:03 +03001361#define GRE6_FEATURES (NETIF_F_SG | \
1362 NETIF_F_FRAGLIST | \
1363 NETIF_F_HIGHDMA | \
1364 NETIF_F_HW_CSUM)
1365
1366static void ip6gre_tnl_init_features(struct net_device *dev)
1367{
1368 struct ip6_tnl *nt = netdev_priv(dev);
1369
1370 dev->features |= GRE6_FEATURES;
1371 dev->hw_features |= GRE6_FEATURES;
1372
1373 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1374 /* TCP offload with GRE SEQ is not supported, nor
1375 * can we support 2 levels of outer headers requiring
1376 * an update.
1377 */
1378 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1379 nt->encap.type == TUNNEL_ENCAP_NONE) {
1380 dev->features |= NETIF_F_GSO_SOFTWARE;
1381 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1382 }
1383
1384 /* Can use a lockless transmit, unless we generate
1385 * output sequences
1386 */
1387 dev->features |= NETIF_F_LLTX;
1388 }
1389}
1390
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001391static int ip6gre_tunnel_init_common(struct net_device *dev)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001392{
1393 struct ip6_tnl *tunnel;
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001394 int ret;
Tom Herbertb05229f2016-04-29 17:12:21 -07001395 int t_hlen;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001396
1397 tunnel = netdev_priv(dev);
1398
1399 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001400 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001401 strcpy(tunnel->parms.name, dev->name);
1402
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001403 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1404 if (!dev->tstats)
1405 return -ENOMEM;
1406
Paolo Abeni607f7252016-02-12 15:43:54 +01001407 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
Martin KaFai Laucdf34642015-09-15 14:30:07 -07001408 if (ret) {
1409 free_percpu(dev->tstats);
1410 dev->tstats = NULL;
1411 return ret;
1412 }
1413
Petr Machataa4833732018-05-17 16:36:27 +02001414 t_hlen = ip6gre_calc_hlen(tunnel);
Tom Herbertdb2ec952016-05-09 17:12:08 -07001415 dev->mtu = ETH_DATA_LEN - t_hlen;
Haishuang Yan1b227e52016-05-21 18:17:34 +08001416 if (dev->type == ARPHRD_ETHER)
1417 dev->mtu -= ETH_HLEN;
Tom Herbertb05229f2016-04-29 17:12:21 -07001418 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1419 dev->mtu -= 8;
1420
William Tu6712abc2017-12-01 15:26:08 -08001421 if (tunnel->parms.collect_md) {
1422 dev->features |= NETIF_F_NETNS_LOCAL;
1423 netif_keep_dst(dev);
1424 }
Alexey Kodaneve5a93362017-12-20 19:36:03 +03001425 ip6gre_tnl_init_features(dev);
William Tu6712abc2017-12-01 15:26:08 -08001426
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001427 return 0;
1428}
1429
1430static int ip6gre_tunnel_init(struct net_device *dev)
1431{
1432 struct ip6_tnl *tunnel;
1433 int ret;
1434
1435 ret = ip6gre_tunnel_init_common(dev);
1436 if (ret)
1437 return ret;
1438
1439 tunnel = netdev_priv(dev);
1440
William Tu6712abc2017-12-01 15:26:08 -08001441 if (tunnel->parms.collect_md)
1442 return 0;
1443
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001444 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1445 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1446
1447 if (ipv6_addr_any(&tunnel->parms.raddr))
1448 dev->header_ops = &ip6gre_header_ops;
1449
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001450 return 0;
1451}
1452
1453static void ip6gre_fb_tunnel_init(struct net_device *dev)
1454{
1455 struct ip6_tnl *tunnel = netdev_priv(dev);
1456
1457 tunnel->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001458 tunnel->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001459 strcpy(tunnel->parms.name, dev->name);
1460
1461 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1462
1463 dev_hold(dev);
1464}
1465
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001466static struct inet6_protocol ip6gre_protocol __read_mostly = {
Tom Herbert308edfdf2016-04-29 17:12:17 -07001467 .handler = gre_rcv,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001468 .err_handler = ip6gre_err,
1469 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1470};
1471
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001472static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001473{
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001474 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1475 struct net_device *dev, *aux;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001476 int prio;
1477
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001478 for_each_netdev_safe(net, dev, aux)
1479 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
William Tu5a963eb2017-11-30 11:51:29 -08001480 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1481 dev->rtnl_link_ops == &ip6erspan_tap_ops)
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001482 unregister_netdevice_queue(dev, head);
1483
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001484 for (prio = 0; prio < 4; prio++) {
1485 int h;
Jiri Kosinae87a8f22016-08-10 11:03:35 +02001486 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001487 struct ip6_tnl *t;
1488
1489 t = rtnl_dereference(ign->tunnels[prio][h]);
1490
Ian Morris53b24b82015-03-29 14:00:05 +01001491 while (t) {
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001492 /* If dev is in the same netns, it has already
1493 * been added to the list by the previous loop.
1494 */
1495 if (!net_eq(dev_net(t->dev), net))
1496 unregister_netdevice_queue(t->dev,
1497 head);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001498 t = rtnl_dereference(t->next);
1499 }
1500 }
1501 }
1502}
1503
1504static int __net_init ip6gre_init_net(struct net *net)
1505{
1506 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1507 int err;
1508
Eric Dumazet79134e62018-03-08 12:51:41 -08001509 if (!net_has_fallback_tunnels(net))
1510 return 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001511 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001512 NET_NAME_UNKNOWN,
1513 ip6gre_tunnel_setup);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001514 if (!ign->fb_tunnel_dev) {
1515 err = -ENOMEM;
1516 goto err_alloc_dev;
1517 }
1518 dev_net_set(ign->fb_tunnel_dev, net);
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001519 /* FB netdevice is special: we have one, and only one per netns.
1520 * Allowing to move it to another netns is clearly unsafe.
1521 */
1522 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1523
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001524
1525 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1526 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1527
1528 err = register_netdev(ign->fb_tunnel_dev);
1529 if (err)
1530 goto err_reg_dev;
1531
1532 rcu_assign_pointer(ign->tunnels_wc[0],
1533 netdev_priv(ign->fb_tunnel_dev));
1534 return 0;
1535
1536err_reg_dev:
David S. Millercf124db2017-05-08 12:52:56 -04001537 free_netdev(ign->fb_tunnel_dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001538err_alloc_dev:
1539 return err;
1540}
1541
Eric Dumazetbb401ca2017-09-19 16:27:08 -07001542static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001543{
Eric Dumazetbb401ca2017-09-19 16:27:08 -07001544 struct net *net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001545 LIST_HEAD(list);
1546
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001547 rtnl_lock();
Eric Dumazetbb401ca2017-09-19 16:27:08 -07001548 list_for_each_entry(net, net_list, exit_list)
1549 ip6gre_destroy_tunnels(net, &list);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001550 unregister_netdevice_many(&list);
1551 rtnl_unlock();
1552}
1553
1554static struct pernet_operations ip6gre_net_ops = {
1555 .init = ip6gre_init_net,
Eric Dumazetbb401ca2017-09-19 16:27:08 -07001556 .exit_batch = ip6gre_exit_batch_net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001557 .id = &ip6gre_net_id,
1558 .size = sizeof(struct ip6gre_net),
1559};
1560
Matthias Schiffera8b8a8892017-06-25 23:56:01 +02001561static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1562 struct netlink_ext_ack *extack)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001563{
1564 __be16 flags;
1565
1566 if (!data)
1567 return 0;
1568
1569 flags = 0;
1570 if (data[IFLA_GRE_IFLAGS])
1571 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1572 if (data[IFLA_GRE_OFLAGS])
1573 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1574 if (flags & (GRE_VERSION|GRE_ROUTING))
1575 return -EINVAL;
1576
1577 return 0;
1578}
1579
Matthias Schiffera8b8a8892017-06-25 23:56:01 +02001580static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1581 struct netlink_ext_ack *extack)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001582{
1583 struct in6_addr daddr;
1584
1585 if (tb[IFLA_ADDRESS]) {
1586 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1587 return -EINVAL;
1588 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1589 return -EADDRNOTAVAIL;
1590 }
1591
1592 if (!data)
1593 goto out;
1594
1595 if (data[IFLA_GRE_REMOTE]) {
Jiri Benc67b61f62015-03-29 16:59:26 +02001596 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001597 if (ipv6_addr_any(&daddr))
1598 return -EINVAL;
1599 }
1600
1601out:
Matthias Schiffera8b8a8892017-06-25 23:56:01 +02001602 return ip6gre_tunnel_validate(tb, data, extack);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001603}
1604
William Tu5a963eb2017-11-30 11:51:29 -08001605static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1606 struct netlink_ext_ack *extack)
1607{
1608 __be16 flags = 0;
William Tu94d7d8f2017-12-13 16:38:57 -08001609 int ret, ver = 0;
William Tu5a963eb2017-11-30 11:51:29 -08001610
1611 if (!data)
1612 return 0;
1613
1614 ret = ip6gre_tap_validate(tb, data, extack);
1615 if (ret)
1616 return ret;
1617
1618 /* ERSPAN should only have GRE sequence and key flag */
1619 if (data[IFLA_GRE_OFLAGS])
1620 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1621 if (data[IFLA_GRE_IFLAGS])
1622 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1623 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1624 flags != (GRE_SEQ | GRE_KEY))
1625 return -EINVAL;
1626
1627 /* ERSPAN Session ID only has 10-bit. Since we reuse
1628 * 32-bit key field as ID, check it's range.
1629 */
1630 if (data[IFLA_GRE_IKEY] &&
1631 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1632 return -EINVAL;
1633
1634 if (data[IFLA_GRE_OKEY] &&
1635 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1636 return -EINVAL;
1637
William Tu94d7d8f2017-12-13 16:38:57 -08001638 if (data[IFLA_GRE_ERSPAN_VER]) {
1639 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1640 if (ver != 1 && ver != 2)
William Tu5a963eb2017-11-30 11:51:29 -08001641 return -EINVAL;
1642 }
William Tu94d7d8f2017-12-13 16:38:57 -08001643
1644 if (ver == 1) {
1645 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1646 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1647
1648 if (index & ~INDEX_MASK)
1649 return -EINVAL;
1650 }
1651 } else if (ver == 2) {
1652 if (data[IFLA_GRE_ERSPAN_DIR]) {
1653 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1654
1655 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1656 return -EINVAL;
1657 }
1658
1659 if (data[IFLA_GRE_ERSPAN_HWID]) {
1660 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1661
1662 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1663 return -EINVAL;
1664 }
1665 }
1666
William Tu5a963eb2017-11-30 11:51:29 -08001667 return 0;
1668}
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001669
1670static void ip6gre_netlink_parms(struct nlattr *data[],
1671 struct __ip6_tnl_parm *parms)
1672{
1673 memset(parms, 0, sizeof(*parms));
1674
1675 if (!data)
1676 return;
1677
1678 if (data[IFLA_GRE_LINK])
1679 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1680
1681 if (data[IFLA_GRE_IFLAGS])
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001682 parms->i_flags = gre_flags_to_tnl_flags(
1683 nla_get_be16(data[IFLA_GRE_IFLAGS]));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001684
1685 if (data[IFLA_GRE_OFLAGS])
Tom Herbertf41fe3c2016-05-09 17:12:09 -07001686 parms->o_flags = gre_flags_to_tnl_flags(
1687 nla_get_be16(data[IFLA_GRE_OFLAGS]));
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001688
1689 if (data[IFLA_GRE_IKEY])
1690 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1691
1692 if (data[IFLA_GRE_OKEY])
1693 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1694
1695 if (data[IFLA_GRE_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +02001696 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001697
1698 if (data[IFLA_GRE_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +02001699 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001700
1701 if (data[IFLA_GRE_TTL])
1702 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1703
1704 if (data[IFLA_GRE_ENCAP_LIMIT])
1705 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1706
1707 if (data[IFLA_GRE_FLOWINFO])
Lance Richardsonc2675de2016-09-24 14:01:04 -04001708 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001709
1710 if (data[IFLA_GRE_FLAGS])
1711 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
Craig Gallek0a473b82017-04-19 12:30:53 -04001712
1713 if (data[IFLA_GRE_FWMARK])
1714 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
William Tu5a963eb2017-11-30 11:51:29 -08001715
William Tu6712abc2017-12-01 15:26:08 -08001716 if (data[IFLA_GRE_COLLECT_METADATA])
1717 parms->collect_md = true;
William Tu94d7d8f2017-12-13 16:38:57 -08001718
1719 if (data[IFLA_GRE_ERSPAN_VER])
1720 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1721
1722 if (parms->erspan_ver == 1) {
1723 if (data[IFLA_GRE_ERSPAN_INDEX])
1724 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1725 } else if (parms->erspan_ver == 2) {
1726 if (data[IFLA_GRE_ERSPAN_DIR])
1727 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1728 if (data[IFLA_GRE_ERSPAN_HWID])
1729 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1730 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001731}
1732
1733static int ip6gre_tap_init(struct net_device *dev)
1734{
Martin KaFai Laua3c119d2015-09-15 14:30:05 -07001735 int ret;
1736
1737 ret = ip6gre_tunnel_init_common(dev);
1738 if (ret)
1739 return ret;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001740
Shweta Choudaha0a46baa2016-06-08 20:15:43 +01001741 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1742
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001743 return 0;
1744}
1745
1746static const struct net_device_ops ip6gre_tap_netdev_ops = {
1747 .ndo_init = ip6gre_tap_init,
1748 .ndo_uninit = ip6gre_tunnel_uninit,
1749 .ndo_start_xmit = ip6gre_tunnel_xmit,
1750 .ndo_set_mac_address = eth_mac_addr,
1751 .ndo_validate_addr = eth_validate_addr,
Tom Herbertb05229f2016-04-29 17:12:21 -07001752 .ndo_change_mtu = ip6_tnl_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +00001753 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +02001754 .ndo_get_iflink = ip6_tnl_get_iflink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001755};
1756
William Tu5a963eb2017-11-30 11:51:29 -08001757static int ip6erspan_tap_init(struct net_device *dev)
1758{
1759 struct ip6_tnl *tunnel;
1760 int t_hlen;
1761 int ret;
1762
1763 tunnel = netdev_priv(dev);
1764
1765 tunnel->dev = dev;
1766 tunnel->net = dev_net(dev);
1767 strcpy(tunnel->parms.name, dev->name);
1768
1769 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1770 if (!dev->tstats)
1771 return -ENOMEM;
1772
1773 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1774 if (ret) {
1775 free_percpu(dev->tstats);
1776 dev->tstats = NULL;
1777 return ret;
1778 }
1779
1780 tunnel->tun_hlen = 8;
1781 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
William Tu94d7d8f2017-12-13 16:38:57 -08001782 erspan_hdr_len(tunnel->parms.erspan_ver);
William Tu5a963eb2017-11-30 11:51:29 -08001783 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1784
1785 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1786 dev->mtu = ETH_DATA_LEN - t_hlen;
1787 if (dev->type == ARPHRD_ETHER)
1788 dev->mtu -= ETH_HLEN;
1789 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1790 dev->mtu -= 8;
1791
1792 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
William Tu5a963eb2017-11-30 11:51:29 -08001793 ip6gre_tnl_link_config(tunnel, 1);
1794
1795 return 0;
1796}
1797
1798static const struct net_device_ops ip6erspan_netdev_ops = {
1799 .ndo_init = ip6erspan_tap_init,
1800 .ndo_uninit = ip6gre_tunnel_uninit,
1801 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1802 .ndo_set_mac_address = eth_mac_addr,
1803 .ndo_validate_addr = eth_validate_addr,
1804 .ndo_change_mtu = ip6_tnl_change_mtu,
1805 .ndo_get_stats64 = ip_tunnel_get_stats64,
1806 .ndo_get_iflink = ip6_tnl_get_iflink,
1807};
1808
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001809static void ip6gre_tap_setup(struct net_device *dev)
1810{
1811
1812 ether_setup(dev);
1813
Xin Long2c521292017-12-18 14:25:09 +08001814 dev->max_mtu = 0;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001815 dev->netdev_ops = &ip6gre_tap_netdev_ops;
David S. Millercf124db2017-05-08 12:52:56 -04001816 dev->needs_free_netdev = true;
1817 dev->priv_destructor = ip6gre_dev_free;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001818
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001819 dev->features |= NETIF_F_NETNS_LOCAL;
Jiri Bencd13b1612016-02-17 15:32:53 +01001820 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
Shweta Choudaha0a46baa2016-06-08 20:15:43 +01001821 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
Xin Long2d405572017-09-28 13:23:50 +08001822 netif_keep_dst(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001823}
1824
Petr Machatad1b2a6c2018-02-27 14:53:37 +01001825bool is_ip6gretap_dev(const struct net_device *dev)
1826{
1827 return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1828}
1829EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1830
Tom Herbert1faf3d92016-05-18 09:06:19 -07001831static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1832 struct ip_tunnel_encap *ipencap)
1833{
1834 bool ret = false;
1835
1836 memset(ipencap, 0, sizeof(*ipencap));
1837
1838 if (!data)
1839 return ret;
1840
1841 if (data[IFLA_GRE_ENCAP_TYPE]) {
1842 ret = true;
1843 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1844 }
1845
1846 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1847 ret = true;
1848 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1849 }
1850
1851 if (data[IFLA_GRE_ENCAP_SPORT]) {
1852 ret = true;
1853 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1854 }
1855
1856 if (data[IFLA_GRE_ENCAP_DPORT]) {
1857 ret = true;
1858 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1859 }
1860
1861 return ret;
1862}
1863
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001864static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
Matthias Schiffer7a3f4a12017-06-25 23:55:59 +02001865 struct nlattr *tb[], struct nlattr *data[],
1866 struct netlink_ext_ack *extack)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001867{
1868 struct ip6_tnl *nt;
1869 struct net *net = dev_net(dev);
1870 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
Tom Herbert1faf3d92016-05-18 09:06:19 -07001871 struct ip_tunnel_encap ipencap;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001872 int err;
1873
1874 nt = netdev_priv(dev);
Tom Herbert1faf3d92016-05-18 09:06:19 -07001875
1876 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1877 int err = ip6_tnl_encap_setup(nt, &ipencap);
1878
1879 if (err < 0)
1880 return err;
1881 }
1882
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001883 ip6gre_netlink_parms(data, &nt->parms);
1884
William Tu6712abc2017-12-01 15:26:08 -08001885 if (nt->parms.collect_md) {
1886 if (rtnl_dereference(ign->collect_md_tun))
1887 return -EEXIST;
1888 } else {
1889 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1890 return -EEXIST;
1891 }
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001892
1893 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1894 eth_hw_addr_random(dev);
1895
1896 nt->dev = dev;
Nicolas Dichtel0bd876282013-08-13 17:51:12 +02001897 nt->net = dev_net(dev);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001898
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001899 err = register_netdevice(dev);
1900 if (err)
1901 goto out;
1902
Alexey Kodanev128bb972018-01-18 20:51:12 +03001903 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1904
1905 if (tb[IFLA_MTU])
1906 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1907
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001908 dev_hold(dev);
1909 ip6gre_tunnel_link(ign, nt);
1910
1911out:
1912 return err;
1913}
1914
1915static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
Matthias Schifferad744b22017-06-25 23:56:00 +02001916 struct nlattr *data[],
1917 struct netlink_ext_ack *extack)
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001918{
Nicolas Dichtel22f08062014-04-22 10:15:24 +02001919 struct ip6_tnl *t, *nt = netdev_priv(dev);
1920 struct net *net = nt->net;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001921 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1922 struct __ip6_tnl_parm p;
Tom Herbert1faf3d92016-05-18 09:06:19 -07001923 struct ip_tunnel_encap ipencap;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001924
1925 if (dev == ign->fb_tunnel_dev)
1926 return -EINVAL;
1927
Tom Herbert1faf3d92016-05-18 09:06:19 -07001928 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1929 int err = ip6_tnl_encap_setup(nt, &ipencap);
1930
1931 if (err < 0)
1932 return err;
1933 }
1934
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001935 ip6gre_netlink_parms(data, &p);
1936
1937 t = ip6gre_tunnel_locate(net, &p, 0);
1938
1939 if (t) {
1940 if (t->dev != dev)
1941 return -EEXIST;
1942 } else {
1943 t = nt;
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001944 }
1945
Nicolas Dichtel6a61d4d2015-12-03 17:21:50 +01001946 ip6gre_tunnel_unlink(ign, t);
1947 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1948 ip6gre_tunnel_link(ign, t);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001949 return 0;
1950}
1951
Nicolas Dichtel54d63f782014-04-14 17:11:38 +02001952static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1953{
1954 struct net *net = dev_net(dev);
1955 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1956
1957 if (dev != ign->fb_tunnel_dev)
1958 unregister_netdevice_queue(dev, head);
1959}
1960
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001961static size_t ip6gre_get_size(const struct net_device *dev)
1962{
1963 return
1964 /* IFLA_GRE_LINK */
1965 nla_total_size(4) +
1966 /* IFLA_GRE_IFLAGS */
1967 nla_total_size(2) +
1968 /* IFLA_GRE_OFLAGS */
1969 nla_total_size(2) +
1970 /* IFLA_GRE_IKEY */
1971 nla_total_size(4) +
1972 /* IFLA_GRE_OKEY */
1973 nla_total_size(4) +
1974 /* IFLA_GRE_LOCAL */
Nicolas Dichtela3754132012-11-09 05:34:56 +00001975 nla_total_size(sizeof(struct in6_addr)) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001976 /* IFLA_GRE_REMOTE */
Nicolas Dichtela3754132012-11-09 05:34:56 +00001977 nla_total_size(sizeof(struct in6_addr)) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001978 /* IFLA_GRE_TTL */
1979 nla_total_size(1) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00001980 /* IFLA_GRE_ENCAP_LIMIT */
1981 nla_total_size(1) +
1982 /* IFLA_GRE_FLOWINFO */
1983 nla_total_size(4) +
1984 /* IFLA_GRE_FLAGS */
1985 nla_total_size(4) +
Tom Herbert1faf3d92016-05-18 09:06:19 -07001986 /* IFLA_GRE_ENCAP_TYPE */
1987 nla_total_size(2) +
1988 /* IFLA_GRE_ENCAP_FLAGS */
1989 nla_total_size(2) +
1990 /* IFLA_GRE_ENCAP_SPORT */
1991 nla_total_size(2) +
1992 /* IFLA_GRE_ENCAP_DPORT */
1993 nla_total_size(2) +
William Tu6712abc2017-12-01 15:26:08 -08001994 /* IFLA_GRE_COLLECT_METADATA */
1995 nla_total_size(0) +
Craig Gallek0a473b82017-04-19 12:30:53 -04001996 /* IFLA_GRE_FWMARK */
1997 nla_total_size(4) +
William Tu5a963eb2017-11-30 11:51:29 -08001998 /* IFLA_GRE_ERSPAN_INDEX */
1999 nla_total_size(4) +
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002000 0;
2001}
2002
2003static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2004{
2005 struct ip6_tnl *t = netdev_priv(dev);
2006 struct __ip6_tnl_parm *p = &t->parms;
2007
2008 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
Tom Herbertf41fe3c2016-05-09 17:12:09 -07002009 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2010 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2011 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2012 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002013 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2014 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
Jiri Benc930345e2015-03-29 16:59:25 +02002015 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2016 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002017 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002018 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2019 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
Craig Gallek0a473b82017-04-19 12:30:53 -04002020 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
William Tu5a963eb2017-11-30 11:51:29 -08002021 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2022 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002023 goto nla_put_failure;
Tom Herbert1faf3d92016-05-18 09:06:19 -07002024
2025 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2026 t->encap.type) ||
2027 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2028 t->encap.sport) ||
2029 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2030 t->encap.dport) ||
2031 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2032 t->encap.flags))
2033 goto nla_put_failure;
2034
William Tu6712abc2017-12-01 15:26:08 -08002035 if (p->collect_md) {
2036 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2037 goto nla_put_failure;
2038 }
2039
William Tu94d7d8f2017-12-13 16:38:57 -08002040 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2041 goto nla_put_failure;
2042
2043 if (p->erspan_ver == 1) {
2044 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2045 goto nla_put_failure;
2046 } else if (p->erspan_ver == 2) {
2047 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2048 goto nla_put_failure;
2049 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2050 goto nla_put_failure;
2051 }
2052
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002053 return 0;
2054
2055nla_put_failure:
2056 return -EMSGSIZE;
2057}
2058
2059static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2060 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2061 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2062 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2063 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2064 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2065 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2066 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2067 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2068 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2069 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2070 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
Tom Herbert1faf3d92016-05-18 09:06:19 -07002071 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2072 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2073 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2074 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
William Tu6712abc2017-12-01 15:26:08 -08002075 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
Craig Gallek0a473b82017-04-19 12:30:53 -04002076 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
William Tu5a963eb2017-11-30 11:51:29 -08002077 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
William Tu94d7d8f2017-12-13 16:38:57 -08002078 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2079 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2080 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002081};
2082
William Tu5a963eb2017-11-30 11:51:29 -08002083static void ip6erspan_tap_setup(struct net_device *dev)
2084{
2085 ether_setup(dev);
2086
2087 dev->netdev_ops = &ip6erspan_netdev_ops;
2088 dev->needs_free_netdev = true;
2089 dev->priv_destructor = ip6gre_dev_free;
2090
2091 dev->features |= NETIF_F_NETNS_LOCAL;
2092 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2093 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2094 netif_keep_dst(dev);
2095}
2096
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002097static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2098 .kind = "ip6gre",
2099 .maxtype = IFLA_GRE_MAX,
2100 .policy = ip6gre_policy,
2101 .priv_size = sizeof(struct ip6_tnl),
2102 .setup = ip6gre_tunnel_setup,
2103 .validate = ip6gre_tunnel_validate,
2104 .newlink = ip6gre_newlink,
2105 .changelink = ip6gre_changelink,
Nicolas Dichtel54d63f782014-04-14 17:11:38 +02002106 .dellink = ip6gre_dellink,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002107 .get_size = ip6gre_get_size,
2108 .fill_info = ip6gre_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01002109 .get_link_net = ip6_tnl_get_link_net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002110};
2111
2112static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2113 .kind = "ip6gretap",
2114 .maxtype = IFLA_GRE_MAX,
2115 .policy = ip6gre_policy,
2116 .priv_size = sizeof(struct ip6_tnl),
2117 .setup = ip6gre_tap_setup,
2118 .validate = ip6gre_tap_validate,
2119 .newlink = ip6gre_newlink,
2120 .changelink = ip6gre_changelink,
2121 .get_size = ip6gre_get_size,
2122 .fill_info = ip6gre_fill_info,
Nicolas Dichtel3390e392015-01-20 15:15:43 +01002123 .get_link_net = ip6_tnl_get_link_net,
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002124};
2125
William Tu5a963eb2017-11-30 11:51:29 -08002126static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2127 .kind = "ip6erspan",
2128 .maxtype = IFLA_GRE_MAX,
2129 .policy = ip6gre_policy,
2130 .priv_size = sizeof(struct ip6_tnl),
2131 .setup = ip6erspan_tap_setup,
2132 .validate = ip6erspan_tap_validate,
2133 .newlink = ip6gre_newlink,
2134 .changelink = ip6gre_changelink,
2135 .get_size = ip6gre_get_size,
2136 .fill_info = ip6gre_fill_info,
2137 .get_link_net = ip6_tnl_get_link_net,
2138};
2139
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002140/*
2141 * And now the modules code and kernel interface.
2142 */
2143
2144static int __init ip6gre_init(void)
2145{
2146 int err;
2147
2148 pr_info("GRE over IPv6 tunneling driver\n");
2149
2150 err = register_pernet_device(&ip6gre_net_ops);
2151 if (err < 0)
2152 return err;
2153
2154 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2155 if (err < 0) {
2156 pr_info("%s: can't add protocol\n", __func__);
2157 goto add_proto_failed;
2158 }
2159
2160 err = rtnl_link_register(&ip6gre_link_ops);
2161 if (err < 0)
2162 goto rtnl_link_failed;
2163
2164 err = rtnl_link_register(&ip6gre_tap_ops);
2165 if (err < 0)
2166 goto tap_ops_failed;
2167
William Tu5a963eb2017-11-30 11:51:29 -08002168 err = rtnl_link_register(&ip6erspan_tap_ops);
2169 if (err < 0)
2170 goto erspan_link_failed;
2171
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002172out:
2173 return err;
2174
William Tu5a963eb2017-11-30 11:51:29 -08002175erspan_link_failed:
2176 rtnl_link_unregister(&ip6gre_tap_ops);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002177tap_ops_failed:
2178 rtnl_link_unregister(&ip6gre_link_ops);
2179rtnl_link_failed:
2180 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2181add_proto_failed:
2182 unregister_pernet_device(&ip6gre_net_ops);
2183 goto out;
2184}
2185
2186static void __exit ip6gre_fini(void)
2187{
2188 rtnl_link_unregister(&ip6gre_tap_ops);
2189 rtnl_link_unregister(&ip6gre_link_ops);
William Tu5a963eb2017-11-30 11:51:29 -08002190 rtnl_link_unregister(&ip6erspan_tap_ops);
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002191 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2192 unregister_pernet_device(&ip6gre_net_ops);
2193}
2194
2195module_init(ip6gre_init);
2196module_exit(ip6gre_fini);
2197MODULE_LICENSE("GPL");
2198MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2199MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2200MODULE_ALIAS_RTNL_LINK("ip6gre");
Nicolas Dichtel5a4ee9a2014-09-24 11:03:00 +02002201MODULE_ALIAS_RTNL_LINK("ip6gretap");
William Tu94d7d8f2017-12-13 16:38:57 -08002202MODULE_ALIAS_RTNL_LINK("ip6erspan");
xeb@mail.ruc12b3952012-08-10 00:51:50 +00002203MODULE_ALIAS_NETDEV("ip6gre0");