1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * GRE over IPv6 protocol decoder.
4 *
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/in.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/in6.h>
24 #include <linux/inetdevice.h>
25 #include <linux/igmp.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/etherdevice.h>
28 #include <linux/if_ether.h>
29 #include <linux/hash.h>
30 #include <linux/if_tunnel.h>
31 #include <linux/ip6_tunnel.h>
32
33 #include <net/sock.h>
34 #include <net/ip.h>
35 #include <net/ip_tunnels.h>
36 #include <net/icmp.h>
37 #include <net/protocol.h>
38 #include <net/addrconf.h>
39 #include <net/arp.h>
40 #include <net/checksum.h>
41 #include <net/dsfield.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46 #include <net/rtnetlink.h>
47
48 #include <net/ipv6.h>
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
51 #include <net/ip6_tunnel.h>
52 #include <net/gre.h>
53 #include <net/erspan.h>
54 #include <net/dst_metadata.h>
55
56
57 static bool log_ecn_error = true;
58 module_param(log_ecn_error, bool, 0644);
59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
60
61 #define IP6_GRE_HASH_SIZE_SHIFT 5
62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
63
64 static unsigned int ip6gre_net_id __read_mostly;
65 struct ip6gre_net {
66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
67
68 struct ip6_tnl __rcu *collect_md_tun;
69 struct ip6_tnl __rcu *collect_md_tun_erspan;
70 struct net_device *fb_tunnel_dev;
71 };
72
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82 /* Tunnel hash table */
83
84 /*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
HASH_ADDR(const struct in6_addr * addr)101 static u32 HASH_ADDR(const struct in6_addr *addr)
102 {
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
106 }
107
108 #define tunnels_r_l tunnels[3]
109 #define tunnels_r tunnels[2]
110 #define tunnels_l tunnels[1]
111 #define tunnels_wc tunnels[0]
112
113 /* Given src, dst and key, find appropriate for input tunnel. */
114
ip6gre_tunnel_lookup(struct net_device * dev,const struct in6_addr * remote,const struct in6_addr * local,__be32 key,__be16 gre_proto)115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
118 {
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
125 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
126 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130 struct net_device *ndev;
131
132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
137 continue;
138
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
141 continue;
142
143 score = 0;
144 if (t->parms.link != link)
145 score |= 1;
146 if (t->dev->type != dev_type)
147 score |= 2;
148 if (score == 0)
149 return t;
150
151 if (score < cand_score) {
152 cand = t;
153 cand_score = score;
154 }
155 }
156
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
161 continue;
162
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
165 continue;
166
167 score = 0;
168 if (t->parms.link != link)
169 score |= 1;
170 if (t->dev->type != dev_type)
171 score |= 2;
172 if (score == 0)
173 return t;
174
175 if (score < cand_score) {
176 cand = t;
177 cand_score = score;
178 }
179 }
180
181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
187 continue;
188
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
191 continue;
192
193 score = 0;
194 if (t->parms.link != link)
195 score |= 1;
196 if (t->dev->type != dev_type)
197 score |= 2;
198 if (score == 0)
199 return t;
200
201 if (score < cand_score) {
202 cand = t;
203 cand_score = score;
204 }
205 }
206
207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
210 continue;
211
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
214 continue;
215
216 score = 0;
217 if (t->parms.link != link)
218 score |= 1;
219 if (t->dev->type != dev_type)
220 score |= 2;
221 if (score == 0)
222 return t;
223
224 if (score < cand_score) {
225 cand = t;
226 cand_score = score;
227 }
228 }
229
230 if (cand)
231 return cand;
232
233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
236 else
237 t = rcu_dereference(ign->collect_md_tun);
238
239 if (t && t->dev->flags & IFF_UP)
240 return t;
241
242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
245
246 return NULL;
247 }
248
__ip6gre_bucket(struct ip6gre_net * ign,const struct __ip6_tnl_parm * p)249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
251 {
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
255 int prio = 0;
256
257 if (!ipv6_addr_any(local))
258 prio |= 1;
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
260 prio |= 2;
261 h ^= HASH_ADDR(remote);
262 }
263
264 return &ign->tunnels[prio][h];
265 }
266
ip6gre_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
268 {
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
271 }
272
ip6erspan_tunnel_link_md(struct ip6gre_net * ign,struct ip6_tnl * t)273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
274 {
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
277 }
278
ip6gre_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
280 {
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
283 }
284
ip6erspan_tunnel_unlink_md(struct ip6gre_net * ign,struct ip6_tnl * t)285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
286 struct ip6_tnl *t)
287 {
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
290 }
291
ip6gre_bucket(struct ip6gre_net * ign,const struct ip6_tnl * t)292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
294 {
295 return __ip6gre_bucket(ign, &t->parms);
296 }
297
ip6gre_tunnel_link(struct ip6gre_net * ign,struct ip6_tnl * t)298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
299 {
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
301
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
304 }
305
ip6gre_tunnel_unlink(struct ip6gre_net * ign,struct ip6_tnl * t)306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
307 {
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
310
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
313 tp = &iter->next) {
314 if (t == iter) {
315 rcu_assign_pointer(*tp, t->next);
316 break;
317 }
318 }
319 }
320
ip6gre_tunnel_find(struct net * net,const struct __ip6_tnl_parm * parms,int type)321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
323 int type)
324 {
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
329 struct ip6_tnl *t;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
332
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
335 tp = &t->next)
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
341 break;
342
343 return t;
344 }
345
ip6gre_tunnel_locate(struct net * net,const struct __ip6_tnl_parm * parms,int create)346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
348 {
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
351 char name[IFNAMSIZ];
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
353
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
355 if (t && create)
356 return NULL;
357 if (t || !create)
358 return t;
359
360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
362 return NULL;
363 strscpy(name, parms->name, IFNAMSIZ);
364 } else {
365 strcpy(name, "ip6gre%d");
366 }
367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
369 if (!dev)
370 return NULL;
371
372 dev_net_set(dev, net);
373
374 nt = netdev_priv(dev);
375 nt->parms = *parms;
376 dev->rtnl_link_ops = &ip6gre_link_ops;
377
378 nt->dev = dev;
379 nt->net = dev_net(dev);
380
381 if (register_netdevice(dev) < 0)
382 goto failed_free;
383
384 ip6gre_tnl_link_config(nt, 1);
385 ip6gre_tunnel_link(ign, nt);
386 return nt;
387
388 failed_free:
389 free_netdev(dev);
390 return NULL;
391 }
392
ip6erspan_tunnel_uninit(struct net_device * dev)393 static void ip6erspan_tunnel_uninit(struct net_device *dev)
394 {
395 struct ip6_tnl *t = netdev_priv(dev);
396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
397
398 ip6erspan_tunnel_unlink_md(ign, t);
399 ip6gre_tunnel_unlink(ign, t);
400 dst_cache_reset(&t->dst_cache);
401 netdev_put(dev, &t->dev_tracker);
402 }
403
ip6gre_tunnel_uninit(struct net_device * dev)404 static void ip6gre_tunnel_uninit(struct net_device *dev)
405 {
406 struct ip6_tnl *t = netdev_priv(dev);
407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
408
409 ip6gre_tunnel_unlink_md(ign, t);
410 ip6gre_tunnel_unlink(ign, t);
411 if (ign->fb_tunnel_dev == dev)
412 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
413 dst_cache_reset(&t->dst_cache);
414 netdev_put(dev, &t->dev_tracker);
415 }
416
417
ip6gre_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
419 u8 type, u8 code, int offset, __be32 info)
420 {
421 struct net *net = dev_net(skb->dev);
422 const struct ipv6hdr *ipv6h;
423 struct tnl_ptk_info tpi;
424 struct ip6_tnl *t;
425
426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
427 offset) < 0)
428 return -EINVAL;
429
430 ipv6h = (const struct ipv6hdr *)skb->data;
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 tpi.key, tpi.proto);
433 if (!t)
434 return -ENOENT;
435
436 switch (type) {
437 case ICMPV6_DEST_UNREACH:
438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
439 t->parms.name);
440 if (code != ICMPV6_PORT_UNREACH)
441 break;
442 return 0;
443 case ICMPV6_TIME_EXCEED:
444 if (code == ICMPV6_EXC_HOPLIMIT) {
445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
446 t->parms.name);
447 break;
448 }
449 return 0;
450 case ICMPV6_PARAMPROB: {
451 struct ipv6_tlv_tnl_enc_lim *tel;
452 __u32 teli;
453
454 teli = 0;
455 if (code == ICMPV6_HDR_FIELD)
456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
457
458 if (teli && teli == be32_to_cpu(info) - 2) {
459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
460 if (tel->encap_limit == 0) {
461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
462 t->parms.name);
463 }
464 } else {
465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
466 t->parms.name);
467 }
468 return 0;
469 }
470 case ICMPV6_PKT_TOOBIG:
471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
472 return 0;
473 case NDISC_REDIRECT:
474 ip6_redirect(skb, net, skb->dev->ifindex, 0,
475 sock_net_uid(net, NULL));
476 return 0;
477 }
478
479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
480 t->err_count++;
481 else
482 t->err_count = 1;
483 t->err_time = jiffies;
484
485 return 0;
486 }
487
ip6gre_rcv(struct sk_buff * skb,const struct tnl_ptk_info * tpi)488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
489 {
490 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
492
493 ipv6h = ipv6_hdr(skb);
494 tunnel = ip6gre_tunnel_lookup(skb->dev,
495 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
496 tpi->proto);
497 if (tunnel) {
498 if (tunnel->parms.collect_md) {
499 struct metadata_dst *tun_dst;
500 __be64 tun_id;
501 __be16 flags;
502
503 flags = tpi->flags;
504 tun_id = key32_to_tunnel_id(tpi->key);
505
506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
507 if (!tun_dst)
508 return PACKET_REJECT;
509
510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
511 } else {
512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
513 }
514
515 return PACKET_RCVD;
516 }
517
518 return PACKET_REJECT;
519 }
520
ip6erspan_rcv(struct sk_buff * skb,struct tnl_ptk_info * tpi,int gre_hdr_len)521 static int ip6erspan_rcv(struct sk_buff *skb,
522 struct tnl_ptk_info *tpi,
523 int gre_hdr_len)
524 {
525 struct erspan_base_hdr *ershdr;
526 const struct ipv6hdr *ipv6h;
527 struct erspan_md2 *md2;
528 struct ip6_tnl *tunnel;
529 u8 ver;
530
531 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
532 return PACKET_REJECT;
533
534 ipv6h = ipv6_hdr(skb);
535 ershdr = (struct erspan_base_hdr *)skb->data;
536 ver = ershdr->ver;
537
538 tunnel = ip6gre_tunnel_lookup(skb->dev,
539 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
540 tpi->proto);
541 if (tunnel) {
542 int len = erspan_hdr_len(ver);
543
544 if (unlikely(!pskb_may_pull(skb, len)))
545 return PACKET_REJECT;
546
547 if (__iptunnel_pull_header(skb, len,
548 htons(ETH_P_TEB),
549 false, false) < 0)
550 return PACKET_REJECT;
551
552 if (tunnel->parms.collect_md) {
553 struct erspan_metadata *pkt_md, *md;
554 struct metadata_dst *tun_dst;
555 struct ip_tunnel_info *info;
556 unsigned char *gh;
557 __be64 tun_id;
558 __be16 flags;
559
560 tpi->flags |= TUNNEL_KEY;
561 flags = tpi->flags;
562 tun_id = key32_to_tunnel_id(tpi->key);
563
564 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
565 sizeof(*md));
566 if (!tun_dst)
567 return PACKET_REJECT;
568
569 /* skb can be uncloned in __iptunnel_pull_header, so
570 * old pkt_md is no longer valid and we need to reset
571 * it
572 */
573 gh = skb_network_header(skb) +
574 skb_network_header_len(skb);
575 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
576 sizeof(*ershdr));
577 info = &tun_dst->u.tun_info;
578 md = ip_tunnel_info_opts(info);
579 md->version = ver;
580 md2 = &md->u.md2;
581 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
582 ERSPAN_V2_MDSIZE);
583 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
584 info->options_len = sizeof(*md);
585
586 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
587
588 } else {
589 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
590 }
591
592 return PACKET_RCVD;
593 }
594
595 return PACKET_REJECT;
596 }
597
gre_rcv(struct sk_buff * skb)598 static int gre_rcv(struct sk_buff *skb)
599 {
600 struct tnl_ptk_info tpi;
601 bool csum_err = false;
602 int hdr_len;
603
604 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
605 if (hdr_len < 0)
606 goto drop;
607
608 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
609 goto drop;
610
611 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
612 tpi.proto == htons(ETH_P_ERSPAN2))) {
613 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
614 return 0;
615 goto out;
616 }
617
618 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
619 return 0;
620
621 out:
622 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
623 drop:
624 kfree_skb(skb);
625 return 0;
626 }
627
gre_handle_offloads(struct sk_buff * skb,bool csum)628 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
629 {
630 return iptunnel_handle_offloads(skb,
631 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
632 }
633
prepare_ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)634 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
635 struct net_device *dev,
636 struct flowi6 *fl6, __u8 *dsfield,
637 int *encap_limit)
638 {
639 const struct iphdr *iph = ip_hdr(skb);
640 struct ip6_tnl *t = netdev_priv(dev);
641
642 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
643 *encap_limit = t->parms.encap_limit;
644
645 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
646
647 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
648 *dsfield = ipv4_get_dsfield(iph);
649 else
650 *dsfield = ip6_tclass(t->parms.flowinfo);
651
652 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
653 fl6->flowi6_mark = skb->mark;
654 else
655 fl6->flowi6_mark = t->parms.fwmark;
656
657 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
658 }
659
prepare_ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)660 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
661 struct net_device *dev,
662 struct flowi6 *fl6, __u8 *dsfield,
663 int *encap_limit)
664 {
665 struct ipv6hdr *ipv6h;
666 struct ip6_tnl *t = netdev_priv(dev);
667 __u16 offset;
668
669 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
670 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
671 ipv6h = ipv6_hdr(skb);
672
673 if (offset > 0) {
674 struct ipv6_tlv_tnl_enc_lim *tel;
675
676 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
677 if (tel->encap_limit == 0) {
678 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
679 ICMPV6_HDR_FIELD, offset + 2);
680 return -1;
681 }
682 *encap_limit = tel->encap_limit - 1;
683 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
684 *encap_limit = t->parms.encap_limit;
685 }
686
687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
688
689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
690 *dsfield = ipv6_get_dsfield(ipv6h);
691 else
692 *dsfield = ip6_tclass(t->parms.flowinfo);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
695 fl6->flowlabel |= ip6_flowlabel(ipv6h);
696
697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
698 fl6->flowi6_mark = skb->mark;
699 else
700 fl6->flowi6_mark = t->parms.fwmark;
701
702 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
703
704 return 0;
705 }
706
prepare_ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev,struct flowi6 * fl6,__u8 * dsfield,int * encap_limit)707 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
708 struct net_device *dev,
709 struct flowi6 *fl6, __u8 *dsfield,
710 int *encap_limit)
711 {
712 struct ip6_tnl *t = netdev_priv(dev);
713
714 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
715 *encap_limit = t->parms.encap_limit;
716
717 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
718
719 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
720 *dsfield = 0;
721 else
722 *dsfield = ip6_tclass(t->parms.flowinfo);
723
724 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
725 fl6->flowi6_mark = skb->mark;
726 else
727 fl6->flowi6_mark = t->parms.fwmark;
728
729 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
730
731 return 0;
732 }
733
skb_tunnel_info_txcheck(struct sk_buff * skb)734 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
735 {
736 struct ip_tunnel_info *tun_info;
737
738 tun_info = skb_tunnel_info(skb);
739 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
740 return ERR_PTR(-EINVAL);
741
742 return tun_info;
743 }
744
__gre6_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__be16 proto)745 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
746 struct net_device *dev, __u8 dsfield,
747 struct flowi6 *fl6, int encap_limit,
748 __u32 *pmtu, __be16 proto)
749 {
750 struct ip6_tnl *tunnel = netdev_priv(dev);
751 __be16 protocol;
752 __be16 flags;
753
754 if (dev->type == ARPHRD_ETHER)
755 IPCB(skb)->flags = 0;
756
757 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
758 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
759 else
760 fl6->daddr = tunnel->parms.raddr;
761
762 /* Push GRE header. */
763 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
764
765 if (tunnel->parms.collect_md) {
766 struct ip_tunnel_info *tun_info;
767 const struct ip_tunnel_key *key;
768 int tun_hlen;
769
770 tun_info = skb_tunnel_info_txcheck(skb);
771 if (IS_ERR(tun_info) ||
772 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
773 return -EINVAL;
774
775 key = &tun_info->key;
776 memset(fl6, 0, sizeof(*fl6));
777 fl6->flowi6_proto = IPPROTO_GRE;
778 fl6->daddr = key->u.ipv6.dst;
779 fl6->flowlabel = key->label;
780 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
781 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
782
783 dsfield = key->tos;
784 flags = key->tun_flags &
785 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
786 tun_hlen = gre_calc_hlen(flags);
787
788 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
789 return -ENOMEM;
790
791 gre_build_header(skb, tun_hlen,
792 flags, protocol,
793 tunnel_id_to_key32(tun_info->key.tun_id),
794 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
795 : 0);
796
797 } else {
798 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
799 return -ENOMEM;
800
801 flags = tunnel->parms.o_flags;
802
803 gre_build_header(skb, tunnel->tun_hlen, flags,
804 protocol, tunnel->parms.o_key,
805 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
806 : 0);
807 }
808
809 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
810 NEXTHDR_GRE);
811 }
812
ip6gre_xmit_ipv4(struct sk_buff * skb,struct net_device * dev)813 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
814 {
815 struct ip6_tnl *t = netdev_priv(dev);
816 int encap_limit = -1;
817 struct flowi6 fl6;
818 __u8 dsfield = 0;
819 __u32 mtu;
820 int err;
821
822 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
823
824 if (!t->parms.collect_md)
825 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
826 &dsfield, &encap_limit);
827
828 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
829 if (err)
830 return -1;
831
832 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
833 skb->protocol);
834 if (err != 0) {
835 /* XXX: send ICMP error even if DF is not set. */
836 if (err == -EMSGSIZE)
837 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
838 htonl(mtu));
839 return -1;
840 }
841
842 return 0;
843 }
844
ip6gre_xmit_ipv6(struct sk_buff * skb,struct net_device * dev)845 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
846 {
847 struct ip6_tnl *t = netdev_priv(dev);
848 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
849 int encap_limit = -1;
850 struct flowi6 fl6;
851 __u8 dsfield = 0;
852 __u32 mtu;
853 int err;
854
855 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
856 return -1;
857
858 if (!t->parms.collect_md &&
859 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
860 return -1;
861
862 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
863 return -1;
864
865 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
866 &mtu, skb->protocol);
867 if (err != 0) {
868 if (err == -EMSGSIZE)
869 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
870 return -1;
871 }
872
873 return 0;
874 }
875
ip6gre_xmit_other(struct sk_buff * skb,struct net_device * dev)876 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
877 {
878 struct ip6_tnl *t = netdev_priv(dev);
879 int encap_limit = -1;
880 struct flowi6 fl6;
881 __u8 dsfield = 0;
882 __u32 mtu;
883 int err;
884
885 if (!t->parms.collect_md &&
886 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
887 return -1;
888
889 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
890 if (err)
891 return err;
892 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
893
894 return err;
895 }
896
ip6gre_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)897 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
898 struct net_device *dev)
899 {
900 struct ip6_tnl *t = netdev_priv(dev);
901 __be16 payload_protocol;
902 int ret;
903
904 if (!pskb_inet_may_pull(skb))
905 goto tx_err;
906
907 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
908 goto tx_err;
909
910 payload_protocol = skb_protocol(skb, true);
911 switch (payload_protocol) {
912 case htons(ETH_P_IP):
913 ret = ip6gre_xmit_ipv4(skb, dev);
914 break;
915 case htons(ETH_P_IPV6):
916 ret = ip6gre_xmit_ipv6(skb, dev);
917 break;
918 default:
919 ret = ip6gre_xmit_other(skb, dev);
920 break;
921 }
922
923 if (ret < 0)
924 goto tx_err;
925
926 return NETDEV_TX_OK;
927
928 tx_err:
929 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
930 DEV_STATS_INC(dev, tx_errors);
931 DEV_STATS_INC(dev, tx_dropped);
932 kfree_skb(skb);
933 return NETDEV_TX_OK;
934 }
935
ip6erspan_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)936 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
937 struct net_device *dev)
938 {
939 struct ip_tunnel_info *tun_info = NULL;
940 struct ip6_tnl *t = netdev_priv(dev);
941 struct dst_entry *dst = skb_dst(skb);
942 bool truncate = false;
943 int encap_limit = -1;
944 __u8 dsfield = false;
945 struct flowi6 fl6;
946 int err = -EINVAL;
947 __be16 proto;
948 __u32 mtu;
949 int nhoff;
950
951 if (!pskb_inet_may_pull(skb))
952 goto tx_err;
953
954 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
955 goto tx_err;
956
957 if (gre_handle_offloads(skb, false))
958 goto tx_err;
959
960 if (skb->len > dev->mtu + dev->hard_header_len) {
961 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
962 goto tx_err;
963 truncate = true;
964 }
965
966 nhoff = skb_network_offset(skb);
967 if (skb->protocol == htons(ETH_P_IP) &&
968 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
969 truncate = true;
970
971 if (skb->protocol == htons(ETH_P_IPV6)) {
972 int thoff;
973
974 if (skb_transport_header_was_set(skb))
975 thoff = skb_transport_offset(skb);
976 else
977 thoff = nhoff + sizeof(struct ipv6hdr);
978 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
979 truncate = true;
980 }
981
982 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
983 goto tx_err;
984
985 t->parms.o_flags &= ~TUNNEL_KEY;
986 IPCB(skb)->flags = 0;
987
988 /* For collect_md mode, derive fl6 from the tunnel key,
989 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
990 */
991 if (t->parms.collect_md) {
992 const struct ip_tunnel_key *key;
993 struct erspan_metadata *md;
994 __be32 tun_id;
995
996 tun_info = skb_tunnel_info_txcheck(skb);
997 if (IS_ERR(tun_info) ||
998 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
999 goto tx_err;
1000
1001 key = &tun_info->key;
1002 memset(&fl6, 0, sizeof(fl6));
1003 fl6.flowi6_proto = IPPROTO_GRE;
1004 fl6.daddr = key->u.ipv6.dst;
1005 fl6.flowlabel = key->label;
1006 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1007 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1008
1009 dsfield = key->tos;
1010 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1011 goto tx_err;
1012 if (tun_info->options_len < sizeof(*md))
1013 goto tx_err;
1014 md = ip_tunnel_info_opts(tun_info);
1015
1016 tun_id = tunnel_id_to_key32(key->tun_id);
1017 if (md->version == 1) {
1018 erspan_build_header(skb,
1019 ntohl(tun_id),
1020 ntohl(md->u.index), truncate,
1021 false);
1022 proto = htons(ETH_P_ERSPAN);
1023 } else if (md->version == 2) {
1024 erspan_build_header_v2(skb,
1025 ntohl(tun_id),
1026 md->u.md2.dir,
1027 get_hwid(&md->u.md2),
1028 truncate, false);
1029 proto = htons(ETH_P_ERSPAN2);
1030 } else {
1031 goto tx_err;
1032 }
1033 } else {
1034 switch (skb->protocol) {
1035 case htons(ETH_P_IP):
1036 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1037 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1038 &dsfield, &encap_limit);
1039 break;
1040 case htons(ETH_P_IPV6):
1041 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1042 goto tx_err;
1043 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1044 &dsfield, &encap_limit))
1045 goto tx_err;
1046 break;
1047 default:
1048 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1049 break;
1050 }
1051
1052 if (t->parms.erspan_ver == 1) {
1053 erspan_build_header(skb, ntohl(t->parms.o_key),
1054 t->parms.index,
1055 truncate, false);
1056 proto = htons(ETH_P_ERSPAN);
1057 } else if (t->parms.erspan_ver == 2) {
1058 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1059 t->parms.dir,
1060 t->parms.hwid,
1061 truncate, false);
1062 proto = htons(ETH_P_ERSPAN2);
1063 } else {
1064 goto tx_err;
1065 }
1066
1067 fl6.daddr = t->parms.raddr;
1068 }
1069
1070 /* Push GRE header. */
1071 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1072
1073 /* TooBig packet may have updated dst->dev's mtu */
1074 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1075 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1076
1077 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1078 NEXTHDR_GRE);
1079 if (err != 0) {
1080 /* XXX: send ICMP error even if DF is not set. */
1081 if (err == -EMSGSIZE) {
1082 if (skb->protocol == htons(ETH_P_IP))
1083 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1084 ICMP_FRAG_NEEDED, htonl(mtu));
1085 else
1086 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1087 }
1088
1089 goto tx_err;
1090 }
1091 return NETDEV_TX_OK;
1092
1093 tx_err:
1094 if (!IS_ERR(tun_info))
1095 DEV_STATS_INC(dev, tx_errors);
1096 DEV_STATS_INC(dev, tx_dropped);
1097 kfree_skb(skb);
1098 return NETDEV_TX_OK;
1099 }
1100
ip6gre_tnl_link_config_common(struct ip6_tnl * t)1101 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1102 {
1103 struct net_device *dev = t->dev;
1104 struct __ip6_tnl_parm *p = &t->parms;
1105 struct flowi6 *fl6 = &t->fl.u.ip6;
1106
1107 if (dev->type != ARPHRD_ETHER) {
1108 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1109 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1110 }
1111
1112 /* Set up flowi template */
1113 fl6->saddr = p->laddr;
1114 fl6->daddr = p->raddr;
1115 fl6->flowi6_oif = p->link;
1116 fl6->flowlabel = 0;
1117 fl6->flowi6_proto = IPPROTO_GRE;
1118 fl6->fl6_gre_key = t->parms.o_key;
1119
1120 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1121 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1122 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1123 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1124
1125 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1126 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1127
1128 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1129 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1130 dev->flags |= IFF_POINTOPOINT;
1131 else
1132 dev->flags &= ~IFF_POINTOPOINT;
1133 }
1134
ip6gre_tnl_link_config_route(struct ip6_tnl * t,int set_mtu,int t_hlen)1135 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1136 int t_hlen)
1137 {
1138 const struct __ip6_tnl_parm *p = &t->parms;
1139 struct net_device *dev = t->dev;
1140
1141 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1142 int strict = (ipv6_addr_type(&p->raddr) &
1143 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1144
1145 struct rt6_info *rt = rt6_lookup(t->net,
1146 &p->raddr, &p->laddr,
1147 p->link, NULL, strict);
1148
1149 if (!rt)
1150 return;
1151
1152 if (rt->dst.dev) {
1153 unsigned short dst_len = rt->dst.dev->hard_header_len +
1154 t_hlen;
1155
1156 if (t->dev->header_ops)
1157 dev->hard_header_len = dst_len;
1158 else
1159 dev->needed_headroom = dst_len;
1160
1161 if (set_mtu) {
1162 int mtu = rt->dst.dev->mtu - t_hlen;
1163
1164 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1165 mtu -= 8;
1166 if (dev->type == ARPHRD_ETHER)
1167 mtu -= ETH_HLEN;
1168
1169 if (mtu < IPV6_MIN_MTU)
1170 mtu = IPV6_MIN_MTU;
1171 WRITE_ONCE(dev->mtu, mtu);
1172 }
1173 }
1174 ip6_rt_put(rt);
1175 }
1176 }
1177
ip6gre_calc_hlen(struct ip6_tnl * tunnel)1178 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1179 {
1180 int t_hlen;
1181
1182 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1183 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1184
1185 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1186
1187 if (tunnel->dev->header_ops)
1188 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1189 else
1190 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1191
1192 return t_hlen;
1193 }
1194
ip6gre_tnl_link_config(struct ip6_tnl * t,int set_mtu)1195 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1196 {
1197 ip6gre_tnl_link_config_common(t);
1198 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1199 }
1200
ip6gre_tnl_copy_tnl_parm(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1201 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1202 const struct __ip6_tnl_parm *p)
1203 {
1204 t->parms.laddr = p->laddr;
1205 t->parms.raddr = p->raddr;
1206 t->parms.flags = p->flags;
1207 t->parms.hop_limit = p->hop_limit;
1208 t->parms.encap_limit = p->encap_limit;
1209 t->parms.flowinfo = p->flowinfo;
1210 t->parms.link = p->link;
1211 t->parms.proto = p->proto;
1212 t->parms.i_key = p->i_key;
1213 t->parms.o_key = p->o_key;
1214 t->parms.i_flags = p->i_flags;
1215 t->parms.o_flags = p->o_flags;
1216 t->parms.fwmark = p->fwmark;
1217 t->parms.erspan_ver = p->erspan_ver;
1218 t->parms.index = p->index;
1219 t->parms.dir = p->dir;
1220 t->parms.hwid = p->hwid;
1221 dst_cache_reset(&t->dst_cache);
1222 }
1223
ip6gre_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)1224 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1225 int set_mtu)
1226 {
1227 ip6gre_tnl_copy_tnl_parm(t, p);
1228 ip6gre_tnl_link_config(t, set_mtu);
1229 return 0;
1230 }
1231
ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)1232 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1233 const struct ip6_tnl_parm2 *u)
1234 {
1235 p->laddr = u->laddr;
1236 p->raddr = u->raddr;
1237 p->flags = u->flags;
1238 p->hop_limit = u->hop_limit;
1239 p->encap_limit = u->encap_limit;
1240 p->flowinfo = u->flowinfo;
1241 p->link = u->link;
1242 p->i_key = u->i_key;
1243 p->o_key = u->o_key;
1244 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1245 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1246 memcpy(p->name, u->name, sizeof(u->name));
1247 }
1248
ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)1249 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1250 const struct __ip6_tnl_parm *p)
1251 {
1252 u->proto = IPPROTO_GRE;
1253 u->laddr = p->laddr;
1254 u->raddr = p->raddr;
1255 u->flags = p->flags;
1256 u->hop_limit = p->hop_limit;
1257 u->encap_limit = p->encap_limit;
1258 u->flowinfo = p->flowinfo;
1259 u->link = p->link;
1260 u->i_key = p->i_key;
1261 u->o_key = p->o_key;
1262 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1263 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1264 memcpy(u->name, p->name, sizeof(u->name));
1265 }
1266
ip6gre_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1267 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1268 struct ifreq *ifr, void __user *data,
1269 int cmd)
1270 {
1271 int err = 0;
1272 struct ip6_tnl_parm2 p;
1273 struct __ip6_tnl_parm p1;
1274 struct ip6_tnl *t = netdev_priv(dev);
1275 struct net *net = t->net;
1276 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1277
1278 memset(&p1, 0, sizeof(p1));
1279
1280 switch (cmd) {
1281 case SIOCGETTUNNEL:
1282 if (dev == ign->fb_tunnel_dev) {
1283 if (copy_from_user(&p, data, sizeof(p))) {
1284 err = -EFAULT;
1285 break;
1286 }
1287 ip6gre_tnl_parm_from_user(&p1, &p);
1288 t = ip6gre_tunnel_locate(net, &p1, 0);
1289 if (!t)
1290 t = netdev_priv(dev);
1291 }
1292 memset(&p, 0, sizeof(p));
1293 ip6gre_tnl_parm_to_user(&p, &t->parms);
1294 if (copy_to_user(data, &p, sizeof(p)))
1295 err = -EFAULT;
1296 break;
1297
1298 case SIOCADDTUNNEL:
1299 case SIOCCHGTUNNEL:
1300 err = -EPERM;
1301 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1302 goto done;
1303
1304 err = -EFAULT;
1305 if (copy_from_user(&p, data, sizeof(p)))
1306 goto done;
1307
1308 err = -EINVAL;
1309 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1310 goto done;
1311
1312 if (!(p.i_flags&GRE_KEY))
1313 p.i_key = 0;
1314 if (!(p.o_flags&GRE_KEY))
1315 p.o_key = 0;
1316
1317 ip6gre_tnl_parm_from_user(&p1, &p);
1318 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1319
1320 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1321 if (t) {
1322 if (t->dev != dev) {
1323 err = -EEXIST;
1324 break;
1325 }
1326 } else {
1327 t = netdev_priv(dev);
1328
1329 ip6gre_tunnel_unlink(ign, t);
1330 synchronize_net();
1331 ip6gre_tnl_change(t, &p1, 1);
1332 ip6gre_tunnel_link(ign, t);
1333 netdev_state_change(dev);
1334 }
1335 }
1336
1337 if (t) {
1338 err = 0;
1339
1340 memset(&p, 0, sizeof(p));
1341 ip6gre_tnl_parm_to_user(&p, &t->parms);
1342 if (copy_to_user(data, &p, sizeof(p)))
1343 err = -EFAULT;
1344 } else
1345 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1346 break;
1347
1348 case SIOCDELTUNNEL:
1349 err = -EPERM;
1350 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1351 goto done;
1352
1353 if (dev == ign->fb_tunnel_dev) {
1354 err = -EFAULT;
1355 if (copy_from_user(&p, data, sizeof(p)))
1356 goto done;
1357 err = -ENOENT;
1358 ip6gre_tnl_parm_from_user(&p1, &p);
1359 t = ip6gre_tunnel_locate(net, &p1, 0);
1360 if (!t)
1361 goto done;
1362 err = -EPERM;
1363 if (t == netdev_priv(ign->fb_tunnel_dev))
1364 goto done;
1365 dev = t->dev;
1366 }
1367 unregister_netdevice(dev);
1368 err = 0;
1369 break;
1370
1371 default:
1372 err = -EINVAL;
1373 }
1374
1375 done:
1376 return err;
1377 }
1378
ip6gre_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)1379 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1380 unsigned short type, const void *daddr,
1381 const void *saddr, unsigned int len)
1382 {
1383 struct ip6_tnl *t = netdev_priv(dev);
1384 struct ipv6hdr *ipv6h;
1385 __be16 *p;
1386
1387 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1388 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1389 t->fl.u.ip6.flowlabel,
1390 true, &t->fl.u.ip6));
1391 ipv6h->hop_limit = t->parms.hop_limit;
1392 ipv6h->nexthdr = NEXTHDR_GRE;
1393 ipv6h->saddr = t->parms.laddr;
1394 ipv6h->daddr = t->parms.raddr;
1395
1396 p = (__be16 *)(ipv6h + 1);
1397 p[0] = t->parms.o_flags;
1398 p[1] = htons(type);
1399
1400 /*
1401 * Set the source hardware address.
1402 */
1403
1404 if (saddr)
1405 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1406 if (daddr)
1407 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1408 if (!ipv6_addr_any(&ipv6h->daddr))
1409 return t->hlen;
1410
1411 return -t->hlen;
1412 }
1413
1414 static const struct header_ops ip6gre_header_ops = {
1415 .create = ip6gre_header,
1416 };
1417
1418 static const struct net_device_ops ip6gre_netdev_ops = {
1419 .ndo_init = ip6gre_tunnel_init,
1420 .ndo_uninit = ip6gre_tunnel_uninit,
1421 .ndo_start_xmit = ip6gre_tunnel_xmit,
1422 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1423 .ndo_change_mtu = ip6_tnl_change_mtu,
1424 .ndo_get_stats64 = dev_get_tstats64,
1425 .ndo_get_iflink = ip6_tnl_get_iflink,
1426 };
1427
ip6gre_dev_free(struct net_device * dev)1428 static void ip6gre_dev_free(struct net_device *dev)
1429 {
1430 struct ip6_tnl *t = netdev_priv(dev);
1431
1432 gro_cells_destroy(&t->gro_cells);
1433 dst_cache_destroy(&t->dst_cache);
1434 free_percpu(dev->tstats);
1435 }
1436
ip6gre_tunnel_setup(struct net_device * dev)1437 static void ip6gre_tunnel_setup(struct net_device *dev)
1438 {
1439 dev->netdev_ops = &ip6gre_netdev_ops;
1440 dev->needs_free_netdev = true;
1441 dev->priv_destructor = ip6gre_dev_free;
1442
1443 dev->type = ARPHRD_IP6GRE;
1444
1445 dev->flags |= IFF_NOARP;
1446 dev->addr_len = sizeof(struct in6_addr);
1447 netif_keep_dst(dev);
1448 /* This perm addr will be used as interface identifier by IPv6 */
1449 dev->addr_assign_type = NET_ADDR_RANDOM;
1450 eth_random_addr(dev->perm_addr);
1451 }
1452
1453 #define GRE6_FEATURES (NETIF_F_SG | \
1454 NETIF_F_FRAGLIST | \
1455 NETIF_F_HIGHDMA | \
1456 NETIF_F_HW_CSUM)
1457
ip6gre_tnl_init_features(struct net_device * dev)1458 static void ip6gre_tnl_init_features(struct net_device *dev)
1459 {
1460 struct ip6_tnl *nt = netdev_priv(dev);
1461 __be16 flags;
1462
1463 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1464 dev->hw_features |= GRE6_FEATURES;
1465
1466 flags = nt->parms.o_flags;
1467
1468 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1469 * levels of outer headers requiring an update.
1470 */
1471 if (flags & TUNNEL_SEQ)
1472 return;
1473 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1474 return;
1475
1476 dev->features |= NETIF_F_GSO_SOFTWARE;
1477 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1478 }
1479
ip6gre_tunnel_init_common(struct net_device * dev)1480 static int ip6gre_tunnel_init_common(struct net_device *dev)
1481 {
1482 struct ip6_tnl *tunnel;
1483 int ret;
1484 int t_hlen;
1485
1486 tunnel = netdev_priv(dev);
1487
1488 tunnel->dev = dev;
1489 tunnel->net = dev_net(dev);
1490 strcpy(tunnel->parms.name, dev->name);
1491
1492 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1493 if (!dev->tstats)
1494 return -ENOMEM;
1495
1496 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1497 if (ret)
1498 goto cleanup_alloc_pcpu_stats;
1499
1500 ret = gro_cells_init(&tunnel->gro_cells, dev);
1501 if (ret)
1502 goto cleanup_dst_cache_init;
1503
1504 t_hlen = ip6gre_calc_hlen(tunnel);
1505 dev->mtu = ETH_DATA_LEN - t_hlen;
1506 if (dev->type == ARPHRD_ETHER)
1507 dev->mtu -= ETH_HLEN;
1508 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1509 dev->mtu -= 8;
1510
1511 if (tunnel->parms.collect_md) {
1512 netif_keep_dst(dev);
1513 }
1514 ip6gre_tnl_init_features(dev);
1515
1516 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1517 netdev_lockdep_set_classes(dev);
1518 return 0;
1519
1520 cleanup_dst_cache_init:
1521 dst_cache_destroy(&tunnel->dst_cache);
1522 cleanup_alloc_pcpu_stats:
1523 free_percpu(dev->tstats);
1524 dev->tstats = NULL;
1525 return ret;
1526 }
1527
ip6gre_tunnel_init(struct net_device * dev)1528 static int ip6gre_tunnel_init(struct net_device *dev)
1529 {
1530 struct ip6_tnl *tunnel;
1531 int ret;
1532
1533 ret = ip6gre_tunnel_init_common(dev);
1534 if (ret)
1535 return ret;
1536
1537 tunnel = netdev_priv(dev);
1538
1539 if (tunnel->parms.collect_md)
1540 return 0;
1541
1542 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1543 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1544
1545 if (ipv6_addr_any(&tunnel->parms.raddr))
1546 dev->header_ops = &ip6gre_header_ops;
1547
1548 return 0;
1549 }
1550
ip6gre_fb_tunnel_init(struct net_device * dev)1551 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1552 {
1553 struct ip6_tnl *tunnel = netdev_priv(dev);
1554
1555 tunnel->dev = dev;
1556 tunnel->net = dev_net(dev);
1557 strcpy(tunnel->parms.name, dev->name);
1558
1559 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1560 }
1561
1562 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1563 .handler = gre_rcv,
1564 .err_handler = ip6gre_err,
1565 .flags = INET6_PROTO_FINAL,
1566 };
1567
ip6gre_destroy_tunnels(struct net * net,struct list_head * head)1568 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1569 {
1570 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571 struct net_device *dev, *aux;
1572 int prio;
1573
1574 for_each_netdev_safe(net, dev, aux)
1575 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1576 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1577 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1578 unregister_netdevice_queue(dev, head);
1579
1580 for (prio = 0; prio < 4; prio++) {
1581 int h;
1582 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1583 struct ip6_tnl *t;
1584
1585 t = rtnl_dereference(ign->tunnels[prio][h]);
1586
1587 while (t) {
1588 /* If dev is in the same netns, it has already
1589 * been added to the list by the previous loop.
1590 */
1591 if (!net_eq(dev_net(t->dev), net))
1592 unregister_netdevice_queue(t->dev,
1593 head);
1594 t = rtnl_dereference(t->next);
1595 }
1596 }
1597 }
1598 }
1599
ip6gre_init_net(struct net * net)1600 static int __net_init ip6gre_init_net(struct net *net)
1601 {
1602 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1603 struct net_device *ndev;
1604 int err;
1605
1606 if (!net_has_fallback_tunnels(net))
1607 return 0;
1608 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1609 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1610 if (!ndev) {
1611 err = -ENOMEM;
1612 goto err_alloc_dev;
1613 }
1614 ign->fb_tunnel_dev = ndev;
1615 dev_net_set(ign->fb_tunnel_dev, net);
1616 /* FB netdevice is special: we have one, and only one per netns.
1617 * Allowing to move it to another netns is clearly unsafe.
1618 */
1619 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1620
1621
1622 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1623 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1624
1625 err = register_netdev(ign->fb_tunnel_dev);
1626 if (err)
1627 goto err_reg_dev;
1628
1629 rcu_assign_pointer(ign->tunnels_wc[0],
1630 netdev_priv(ign->fb_tunnel_dev));
1631 return 0;
1632
1633 err_reg_dev:
1634 free_netdev(ndev);
1635 err_alloc_dev:
1636 return err;
1637 }
1638
ip6gre_exit_batch_net(struct list_head * net_list)1639 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1640 {
1641 struct net *net;
1642 LIST_HEAD(list);
1643
1644 rtnl_lock();
1645 list_for_each_entry(net, net_list, exit_list)
1646 ip6gre_destroy_tunnels(net, &list);
1647 unregister_netdevice_many(&list);
1648 rtnl_unlock();
1649 }
1650
1651 static struct pernet_operations ip6gre_net_ops = {
1652 .init = ip6gre_init_net,
1653 .exit_batch = ip6gre_exit_batch_net,
1654 .id = &ip6gre_net_id,
1655 .size = sizeof(struct ip6gre_net),
1656 };
1657
ip6gre_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1658 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1659 struct netlink_ext_ack *extack)
1660 {
1661 __be16 flags;
1662
1663 if (!data)
1664 return 0;
1665
1666 flags = 0;
1667 if (data[IFLA_GRE_IFLAGS])
1668 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1669 if (data[IFLA_GRE_OFLAGS])
1670 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1671 if (flags & (GRE_VERSION|GRE_ROUTING))
1672 return -EINVAL;
1673
1674 return 0;
1675 }
1676
ip6gre_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1677 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1678 struct netlink_ext_ack *extack)
1679 {
1680 struct in6_addr daddr;
1681
1682 if (tb[IFLA_ADDRESS]) {
1683 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1684 return -EINVAL;
1685 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1686 return -EADDRNOTAVAIL;
1687 }
1688
1689 if (!data)
1690 goto out;
1691
1692 if (data[IFLA_GRE_REMOTE]) {
1693 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1694 if (ipv6_addr_any(&daddr))
1695 return -EINVAL;
1696 }
1697
1698 out:
1699 return ip6gre_tunnel_validate(tb, data, extack);
1700 }
1701
ip6erspan_tap_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1702 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1703 struct netlink_ext_ack *extack)
1704 {
1705 __be16 flags = 0;
1706 int ret, ver = 0;
1707
1708 if (!data)
1709 return 0;
1710
1711 ret = ip6gre_tap_validate(tb, data, extack);
1712 if (ret)
1713 return ret;
1714
1715 /* ERSPAN should only have GRE sequence and key flag */
1716 if (data[IFLA_GRE_OFLAGS])
1717 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1718 if (data[IFLA_GRE_IFLAGS])
1719 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1720 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1721 flags != (GRE_SEQ | GRE_KEY))
1722 return -EINVAL;
1723
1724 /* ERSPAN Session ID only has 10-bit. Since we reuse
1725 * 32-bit key field as ID, check it's range.
1726 */
1727 if (data[IFLA_GRE_IKEY] &&
1728 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1729 return -EINVAL;
1730
1731 if (data[IFLA_GRE_OKEY] &&
1732 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1733 return -EINVAL;
1734
1735 if (data[IFLA_GRE_ERSPAN_VER]) {
1736 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1737 if (ver != 1 && ver != 2)
1738 return -EINVAL;
1739 }
1740
1741 if (ver == 1) {
1742 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1743 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1744
1745 if (index & ~INDEX_MASK)
1746 return -EINVAL;
1747 }
1748 } else if (ver == 2) {
1749 if (data[IFLA_GRE_ERSPAN_DIR]) {
1750 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1751
1752 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1753 return -EINVAL;
1754 }
1755
1756 if (data[IFLA_GRE_ERSPAN_HWID]) {
1757 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1758
1759 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1760 return -EINVAL;
1761 }
1762 }
1763
1764 return 0;
1765 }
1766
ip6erspan_set_version(struct nlattr * data[],struct __ip6_tnl_parm * parms)1767 static void ip6erspan_set_version(struct nlattr *data[],
1768 struct __ip6_tnl_parm *parms)
1769 {
1770 if (!data)
1771 return;
1772
1773 parms->erspan_ver = 1;
1774 if (data[IFLA_GRE_ERSPAN_VER])
1775 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1776
1777 if (parms->erspan_ver == 1) {
1778 if (data[IFLA_GRE_ERSPAN_INDEX])
1779 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1780 } else if (parms->erspan_ver == 2) {
1781 if (data[IFLA_GRE_ERSPAN_DIR])
1782 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1783 if (data[IFLA_GRE_ERSPAN_HWID])
1784 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1785 }
1786 }
1787
ip6gre_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1788 static void ip6gre_netlink_parms(struct nlattr *data[],
1789 struct __ip6_tnl_parm *parms)
1790 {
1791 memset(parms, 0, sizeof(*parms));
1792
1793 if (!data)
1794 return;
1795
1796 if (data[IFLA_GRE_LINK])
1797 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1798
1799 if (data[IFLA_GRE_IFLAGS])
1800 parms->i_flags = gre_flags_to_tnl_flags(
1801 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1802
1803 if (data[IFLA_GRE_OFLAGS])
1804 parms->o_flags = gre_flags_to_tnl_flags(
1805 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1806
1807 if (data[IFLA_GRE_IKEY])
1808 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1809
1810 if (data[IFLA_GRE_OKEY])
1811 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1812
1813 if (data[IFLA_GRE_LOCAL])
1814 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1815
1816 if (data[IFLA_GRE_REMOTE])
1817 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1818
1819 if (data[IFLA_GRE_TTL])
1820 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1821
1822 if (data[IFLA_GRE_ENCAP_LIMIT])
1823 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1824
1825 if (data[IFLA_GRE_FLOWINFO])
1826 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1827
1828 if (data[IFLA_GRE_FLAGS])
1829 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1830
1831 if (data[IFLA_GRE_FWMARK])
1832 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1833
1834 if (data[IFLA_GRE_COLLECT_METADATA])
1835 parms->collect_md = true;
1836 }
1837
ip6gre_tap_init(struct net_device * dev)1838 static int ip6gre_tap_init(struct net_device *dev)
1839 {
1840 int ret;
1841
1842 ret = ip6gre_tunnel_init_common(dev);
1843 if (ret)
1844 return ret;
1845
1846 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1847
1848 return 0;
1849 }
1850
1851 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1852 .ndo_init = ip6gre_tap_init,
1853 .ndo_uninit = ip6gre_tunnel_uninit,
1854 .ndo_start_xmit = ip6gre_tunnel_xmit,
1855 .ndo_set_mac_address = eth_mac_addr,
1856 .ndo_validate_addr = eth_validate_addr,
1857 .ndo_change_mtu = ip6_tnl_change_mtu,
1858 .ndo_get_stats64 = dev_get_tstats64,
1859 .ndo_get_iflink = ip6_tnl_get_iflink,
1860 };
1861
ip6erspan_calc_hlen(struct ip6_tnl * tunnel)1862 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1863 {
1864 int t_hlen;
1865
1866 tunnel->tun_hlen = 8;
1867 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1868 erspan_hdr_len(tunnel->parms.erspan_ver);
1869
1870 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1871 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1872 return t_hlen;
1873 }
1874
ip6erspan_tap_init(struct net_device * dev)1875 static int ip6erspan_tap_init(struct net_device *dev)
1876 {
1877 struct ip6_tnl *tunnel;
1878 int t_hlen;
1879 int ret;
1880
1881 tunnel = netdev_priv(dev);
1882
1883 tunnel->dev = dev;
1884 tunnel->net = dev_net(dev);
1885 strcpy(tunnel->parms.name, dev->name);
1886
1887 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1888 if (!dev->tstats)
1889 return -ENOMEM;
1890
1891 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1892 if (ret)
1893 goto cleanup_alloc_pcpu_stats;
1894
1895 ret = gro_cells_init(&tunnel->gro_cells, dev);
1896 if (ret)
1897 goto cleanup_dst_cache_init;
1898
1899 t_hlen = ip6erspan_calc_hlen(tunnel);
1900 dev->mtu = ETH_DATA_LEN - t_hlen;
1901 if (dev->type == ARPHRD_ETHER)
1902 dev->mtu -= ETH_HLEN;
1903 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1904 dev->mtu -= 8;
1905
1906 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1907 ip6erspan_tnl_link_config(tunnel, 1);
1908
1909 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1910 netdev_lockdep_set_classes(dev);
1911 return 0;
1912
1913 cleanup_dst_cache_init:
1914 dst_cache_destroy(&tunnel->dst_cache);
1915 cleanup_alloc_pcpu_stats:
1916 free_percpu(dev->tstats);
1917 dev->tstats = NULL;
1918 return ret;
1919 }
1920
1921 static const struct net_device_ops ip6erspan_netdev_ops = {
1922 .ndo_init = ip6erspan_tap_init,
1923 .ndo_uninit = ip6erspan_tunnel_uninit,
1924 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1925 .ndo_set_mac_address = eth_mac_addr,
1926 .ndo_validate_addr = eth_validate_addr,
1927 .ndo_change_mtu = ip6_tnl_change_mtu,
1928 .ndo_get_stats64 = dev_get_tstats64,
1929 .ndo_get_iflink = ip6_tnl_get_iflink,
1930 };
1931
ip6gre_tap_setup(struct net_device * dev)1932 static void ip6gre_tap_setup(struct net_device *dev)
1933 {
1934
1935 ether_setup(dev);
1936
1937 dev->max_mtu = 0;
1938 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1939 dev->needs_free_netdev = true;
1940 dev->priv_destructor = ip6gre_dev_free;
1941
1942 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1943 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1944 netif_keep_dst(dev);
1945 }
1946
ip6gre_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1947 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1948 struct ip_tunnel_encap *ipencap)
1949 {
1950 bool ret = false;
1951
1952 memset(ipencap, 0, sizeof(*ipencap));
1953
1954 if (!data)
1955 return ret;
1956
1957 if (data[IFLA_GRE_ENCAP_TYPE]) {
1958 ret = true;
1959 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1960 }
1961
1962 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1963 ret = true;
1964 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1965 }
1966
1967 if (data[IFLA_GRE_ENCAP_SPORT]) {
1968 ret = true;
1969 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1970 }
1971
1972 if (data[IFLA_GRE_ENCAP_DPORT]) {
1973 ret = true;
1974 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1975 }
1976
1977 return ret;
1978 }
1979
ip6gre_newlink_common(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1980 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1981 struct nlattr *tb[], struct nlattr *data[],
1982 struct netlink_ext_ack *extack)
1983 {
1984 struct ip6_tnl *nt;
1985 struct ip_tunnel_encap ipencap;
1986 int err;
1987
1988 nt = netdev_priv(dev);
1989
1990 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1991 int err = ip6_tnl_encap_setup(nt, &ipencap);
1992
1993 if (err < 0)
1994 return err;
1995 }
1996
1997 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1998 eth_hw_addr_random(dev);
1999
2000 nt->dev = dev;
2001 nt->net = dev_net(dev);
2002
2003 err = register_netdevice(dev);
2004 if (err)
2005 goto out;
2006
2007 if (tb[IFLA_MTU])
2008 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2009
2010 out:
2011 return err;
2012 }
2013
ip6gre_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2014 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2015 struct nlattr *tb[], struct nlattr *data[],
2016 struct netlink_ext_ack *extack)
2017 {
2018 struct ip6_tnl *nt = netdev_priv(dev);
2019 struct net *net = dev_net(dev);
2020 struct ip6gre_net *ign;
2021 int err;
2022
2023 ip6gre_netlink_parms(data, &nt->parms);
2024 ign = net_generic(net, ip6gre_net_id);
2025
2026 if (nt->parms.collect_md) {
2027 if (rtnl_dereference(ign->collect_md_tun))
2028 return -EEXIST;
2029 } else {
2030 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2031 return -EEXIST;
2032 }
2033
2034 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2035 if (!err) {
2036 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2037 ip6gre_tunnel_link_md(ign, nt);
2038 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2039 }
2040 return err;
2041 }
2042
2043 static struct ip6_tnl *
ip6gre_changelink_common(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct __ip6_tnl_parm * p_p,struct netlink_ext_ack * extack)2044 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2045 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2046 struct netlink_ext_ack *extack)
2047 {
2048 struct ip6_tnl *t, *nt = netdev_priv(dev);
2049 struct net *net = nt->net;
2050 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2051 struct ip_tunnel_encap ipencap;
2052
2053 if (dev == ign->fb_tunnel_dev)
2054 return ERR_PTR(-EINVAL);
2055
2056 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2057 int err = ip6_tnl_encap_setup(nt, &ipencap);
2058
2059 if (err < 0)
2060 return ERR_PTR(err);
2061 }
2062
2063 ip6gre_netlink_parms(data, p_p);
2064
2065 t = ip6gre_tunnel_locate(net, p_p, 0);
2066
2067 if (t) {
2068 if (t->dev != dev)
2069 return ERR_PTR(-EEXIST);
2070 } else {
2071 t = nt;
2072 }
2073
2074 return t;
2075 }
2076
ip6gre_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2077 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2078 struct nlattr *data[],
2079 struct netlink_ext_ack *extack)
2080 {
2081 struct ip6_tnl *t = netdev_priv(dev);
2082 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2083 struct __ip6_tnl_parm p;
2084
2085 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2086 if (IS_ERR(t))
2087 return PTR_ERR(t);
2088
2089 ip6gre_tunnel_unlink_md(ign, t);
2090 ip6gre_tunnel_unlink(ign, t);
2091 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2092 ip6gre_tunnel_link_md(ign, t);
2093 ip6gre_tunnel_link(ign, t);
2094 return 0;
2095 }
2096
ip6gre_dellink(struct net_device * dev,struct list_head * head)2097 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2098 {
2099 struct net *net = dev_net(dev);
2100 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2101
2102 if (dev != ign->fb_tunnel_dev)
2103 unregister_netdevice_queue(dev, head);
2104 }
2105
ip6gre_get_size(const struct net_device * dev)2106 static size_t ip6gre_get_size(const struct net_device *dev)
2107 {
2108 return
2109 /* IFLA_GRE_LINK */
2110 nla_total_size(4) +
2111 /* IFLA_GRE_IFLAGS */
2112 nla_total_size(2) +
2113 /* IFLA_GRE_OFLAGS */
2114 nla_total_size(2) +
2115 /* IFLA_GRE_IKEY */
2116 nla_total_size(4) +
2117 /* IFLA_GRE_OKEY */
2118 nla_total_size(4) +
2119 /* IFLA_GRE_LOCAL */
2120 nla_total_size(sizeof(struct in6_addr)) +
2121 /* IFLA_GRE_REMOTE */
2122 nla_total_size(sizeof(struct in6_addr)) +
2123 /* IFLA_GRE_TTL */
2124 nla_total_size(1) +
2125 /* IFLA_GRE_ENCAP_LIMIT */
2126 nla_total_size(1) +
2127 /* IFLA_GRE_FLOWINFO */
2128 nla_total_size(4) +
2129 /* IFLA_GRE_FLAGS */
2130 nla_total_size(4) +
2131 /* IFLA_GRE_ENCAP_TYPE */
2132 nla_total_size(2) +
2133 /* IFLA_GRE_ENCAP_FLAGS */
2134 nla_total_size(2) +
2135 /* IFLA_GRE_ENCAP_SPORT */
2136 nla_total_size(2) +
2137 /* IFLA_GRE_ENCAP_DPORT */
2138 nla_total_size(2) +
2139 /* IFLA_GRE_COLLECT_METADATA */
2140 nla_total_size(0) +
2141 /* IFLA_GRE_FWMARK */
2142 nla_total_size(4) +
2143 /* IFLA_GRE_ERSPAN_INDEX */
2144 nla_total_size(4) +
2145 0;
2146 }
2147
ip6gre_fill_info(struct sk_buff * skb,const struct net_device * dev)2148 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2149 {
2150 struct ip6_tnl *t = netdev_priv(dev);
2151 struct __ip6_tnl_parm *p = &t->parms;
2152 __be16 o_flags = p->o_flags;
2153
2154 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2155 if (!p->collect_md)
2156 o_flags |= TUNNEL_KEY;
2157
2158 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2159 goto nla_put_failure;
2160
2161 if (p->erspan_ver == 1) {
2162 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2163 goto nla_put_failure;
2164 } else {
2165 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2166 goto nla_put_failure;
2167 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2168 goto nla_put_failure;
2169 }
2170 }
2171
2172 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2173 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2174 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2175 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2176 gre_tnl_flags_to_gre_flags(o_flags)) ||
2177 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2178 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2179 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2180 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2181 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2182 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2183 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2184 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2185 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2186 goto nla_put_failure;
2187
2188 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2189 t->encap.type) ||
2190 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2191 t->encap.sport) ||
2192 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2193 t->encap.dport) ||
2194 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2195 t->encap.flags))
2196 goto nla_put_failure;
2197
2198 if (p->collect_md) {
2199 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2200 goto nla_put_failure;
2201 }
2202
2203 return 0;
2204
2205 nla_put_failure:
2206 return -EMSGSIZE;
2207 }
2208
2209 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2210 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2211 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2212 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2213 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2214 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2215 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2216 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2217 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2218 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2219 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2220 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2221 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2222 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2223 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2224 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2225 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2226 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2227 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2228 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2229 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2230 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2231 };
2232
ip6erspan_tap_setup(struct net_device * dev)2233 static void ip6erspan_tap_setup(struct net_device *dev)
2234 {
2235 ether_setup(dev);
2236
2237 dev->max_mtu = 0;
2238 dev->netdev_ops = &ip6erspan_netdev_ops;
2239 dev->needs_free_netdev = true;
2240 dev->priv_destructor = ip6gre_dev_free;
2241
2242 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2243 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2244 netif_keep_dst(dev);
2245 }
2246
ip6erspan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2247 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2248 struct nlattr *tb[], struct nlattr *data[],
2249 struct netlink_ext_ack *extack)
2250 {
2251 struct ip6_tnl *nt = netdev_priv(dev);
2252 struct net *net = dev_net(dev);
2253 struct ip6gre_net *ign;
2254 int err;
2255
2256 ip6gre_netlink_parms(data, &nt->parms);
2257 ip6erspan_set_version(data, &nt->parms);
2258 ign = net_generic(net, ip6gre_net_id);
2259
2260 if (nt->parms.collect_md) {
2261 if (rtnl_dereference(ign->collect_md_tun_erspan))
2262 return -EEXIST;
2263 } else {
2264 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2265 return -EEXIST;
2266 }
2267
2268 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2269 if (!err) {
2270 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2271 ip6erspan_tunnel_link_md(ign, nt);
2272 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2273 }
2274 return err;
2275 }
2276
ip6erspan_tnl_link_config(struct ip6_tnl * t,int set_mtu)2277 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2278 {
2279 ip6gre_tnl_link_config_common(t);
2280 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2281 }
2282
ip6erspan_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,int set_mtu)2283 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2284 const struct __ip6_tnl_parm *p, int set_mtu)
2285 {
2286 ip6gre_tnl_copy_tnl_parm(t, p);
2287 ip6erspan_tnl_link_config(t, set_mtu);
2288 return 0;
2289 }
2290
ip6erspan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2291 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2292 struct nlattr *data[],
2293 struct netlink_ext_ack *extack)
2294 {
2295 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2296 struct __ip6_tnl_parm p;
2297 struct ip6_tnl *t;
2298
2299 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2300 if (IS_ERR(t))
2301 return PTR_ERR(t);
2302
2303 ip6erspan_set_version(data, &p);
2304 ip6gre_tunnel_unlink_md(ign, t);
2305 ip6gre_tunnel_unlink(ign, t);
2306 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2307 ip6erspan_tunnel_link_md(ign, t);
2308 ip6gre_tunnel_link(ign, t);
2309 return 0;
2310 }
2311
2312 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2313 .kind = "ip6gre",
2314 .maxtype = IFLA_GRE_MAX,
2315 .policy = ip6gre_policy,
2316 .priv_size = sizeof(struct ip6_tnl),
2317 .setup = ip6gre_tunnel_setup,
2318 .validate = ip6gre_tunnel_validate,
2319 .newlink = ip6gre_newlink,
2320 .changelink = ip6gre_changelink,
2321 .dellink = ip6gre_dellink,
2322 .get_size = ip6gre_get_size,
2323 .fill_info = ip6gre_fill_info,
2324 .get_link_net = ip6_tnl_get_link_net,
2325 };
2326
2327 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2328 .kind = "ip6gretap",
2329 .maxtype = IFLA_GRE_MAX,
2330 .policy = ip6gre_policy,
2331 .priv_size = sizeof(struct ip6_tnl),
2332 .setup = ip6gre_tap_setup,
2333 .validate = ip6gre_tap_validate,
2334 .newlink = ip6gre_newlink,
2335 .changelink = ip6gre_changelink,
2336 .get_size = ip6gre_get_size,
2337 .fill_info = ip6gre_fill_info,
2338 .get_link_net = ip6_tnl_get_link_net,
2339 };
2340
2341 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2342 .kind = "ip6erspan",
2343 .maxtype = IFLA_GRE_MAX,
2344 .policy = ip6gre_policy,
2345 .priv_size = sizeof(struct ip6_tnl),
2346 .setup = ip6erspan_tap_setup,
2347 .validate = ip6erspan_tap_validate,
2348 .newlink = ip6erspan_newlink,
2349 .changelink = ip6erspan_changelink,
2350 .get_size = ip6gre_get_size,
2351 .fill_info = ip6gre_fill_info,
2352 .get_link_net = ip6_tnl_get_link_net,
2353 };
2354
2355 /*
2356 * And now the modules code and kernel interface.
2357 */
2358
ip6gre_init(void)2359 static int __init ip6gre_init(void)
2360 {
2361 int err;
2362
2363 pr_info("GRE over IPv6 tunneling driver\n");
2364
2365 err = register_pernet_device(&ip6gre_net_ops);
2366 if (err < 0)
2367 return err;
2368
2369 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2370 if (err < 0) {
2371 pr_info("%s: can't add protocol\n", __func__);
2372 goto add_proto_failed;
2373 }
2374
2375 err = rtnl_link_register(&ip6gre_link_ops);
2376 if (err < 0)
2377 goto rtnl_link_failed;
2378
2379 err = rtnl_link_register(&ip6gre_tap_ops);
2380 if (err < 0)
2381 goto tap_ops_failed;
2382
2383 err = rtnl_link_register(&ip6erspan_tap_ops);
2384 if (err < 0)
2385 goto erspan_link_failed;
2386
2387 out:
2388 return err;
2389
2390 erspan_link_failed:
2391 rtnl_link_unregister(&ip6gre_tap_ops);
2392 tap_ops_failed:
2393 rtnl_link_unregister(&ip6gre_link_ops);
2394 rtnl_link_failed:
2395 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2396 add_proto_failed:
2397 unregister_pernet_device(&ip6gre_net_ops);
2398 goto out;
2399 }
2400
ip6gre_fini(void)2401 static void __exit ip6gre_fini(void)
2402 {
2403 rtnl_link_unregister(&ip6gre_tap_ops);
2404 rtnl_link_unregister(&ip6gre_link_ops);
2405 rtnl_link_unregister(&ip6erspan_tap_ops);
2406 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2407 unregister_pernet_device(&ip6gre_net_ops);
2408 }
2409
2410 module_init(ip6gre_init);
2411 module_exit(ip6gre_fini);
2412 MODULE_LICENSE("GPL");
2413 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2414 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2415 MODULE_ALIAS_RTNL_LINK("ip6gre");
2416 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2417 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2418 MODULE_ALIAS_NETDEV("ip6gre0");
2419