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compat: Include confirm_neigh parameter if needed
[ovs.git] / datapath / linux / compat / ip6_gre.c
1 /*
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 #ifndef USE_UPSTREAM_TUNNEL
16 #include <linux/capability.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/uaccess.h>
22 #include <linux/skbuff.h>
23 #include <linux/netdevice.h>
24 #include <linux/in.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/if_arp.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
35 #include <linux/hash.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
38
39 #include <net/sock.h>
40 #include <net/ip.h>
41 #include <net/ip_tunnels.h>
42 #include <net/icmp.h>
43 #include <net/protocol.h>
44 #include <net/addrconf.h>
45 #include <net/arp.h>
46 #include <net/checksum.h>
47 #include <net/dsfield.h>
48 #include <net/inet_ecn.h>
49 #include <net/xfrm.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
52 #include <net/rtnetlink.h>
53
54 #include <net/ipv6.h>
55 #include <net/ip6_fib.h>
56 #include <net/ip6_route.h>
57 #include <net/ip6_tunnel.h>
58 #include <net/gre.h>
59 #include <net/erspan.h>
60 #include <net/dst_metadata.h>
61
62 #include "vport-netdev.h"
63
64 #define IP6_GRE_HASH_SIZE_SHIFT 5
65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
66
67 static unsigned int ip6gre_net_id __read_mostly;
68 static bool ip6_gre_loaded = false;
69 struct ip6gre_net {
70 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
71
72 struct ip6_tnl __rcu *collect_md_tun;
73 struct ip6_tnl __rcu *collect_md_tun_erspan;
74 struct net_device *fb_tunnel_dev;
75 };
76
77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
78 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
79 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
80 static int ip6gre_tunnel_init(struct net_device *dev);
81 static void ip6gre_tunnel_setup(struct net_device *dev);
82 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
83 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
84 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
85
86 /* Tunnel hash table */
87
88 /*
89 4 hash tables:
90
91 3: (remote,local)
92 2: (remote,*)
93 1: (*,local)
94 0: (*,*)
95
96 We require exact key match i.e. if a key is present in packet
97 it will match only tunnel with the same key; if it is not present,
98 it will match only keyless tunnel.
99
100 All keysless packets, if not matched configured keyless tunnels
101 will match fallback tunnel.
102 */
103
104 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
105 static u32 HASH_ADDR(const struct in6_addr *addr)
106 {
107 u32 hash = ipv6_addr_hash(addr);
108
109 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
110 }
111
112 #define tunnels_r_l tunnels[3]
113 #define tunnels_r tunnels[2]
114 #define tunnels_l tunnels[1]
115 #define tunnels_wc tunnels[0]
116
117 /* Given src, dst and key, find appropriate for input tunnel. */
118
119 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
120 const struct in6_addr *remote, const struct in6_addr *local,
121 __be32 key, __be16 gre_proto)
122 {
123 struct net *net = dev_net(dev);
124 int link = dev->ifindex;
125 unsigned int h0 = HASH_ADDR(remote);
126 unsigned int h1 = HASH_KEY(key);
127 struct ip6_tnl *t, *cand = NULL;
128 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
129 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
130 gre_proto == htons(ETH_P_ERSPAN) ||
131 gre_proto == htons(ETH_P_ERSPAN2)) ?
132 ARPHRD_ETHER : ARPHRD_IP6GRE;
133 int score, cand_score = 4;
134
135 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
136 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
137 !ipv6_addr_equal(remote, &t->parms.raddr) ||
138 key != t->parms.i_key ||
139 !(t->dev->flags & IFF_UP))
140 continue;
141
142 if (t->dev->type != ARPHRD_IP6GRE &&
143 t->dev->type != dev_type)
144 continue;
145
146 score = 0;
147 if (t->parms.link != link)
148 score |= 1;
149 if (t->dev->type != dev_type)
150 score |= 2;
151 if (score == 0)
152 return t;
153
154 if (score < cand_score) {
155 cand = t;
156 cand_score = score;
157 }
158 }
159
160 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
161 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
162 key != t->parms.i_key ||
163 !(t->dev->flags & IFF_UP))
164 continue;
165
166 if (t->dev->type != ARPHRD_IP6GRE &&
167 t->dev->type != dev_type)
168 continue;
169
170 score = 0;
171 if (t->parms.link != link)
172 score |= 1;
173 if (t->dev->type != dev_type)
174 score |= 2;
175 if (score == 0)
176 return t;
177
178 if (score < cand_score) {
179 cand = t;
180 cand_score = score;
181 }
182 }
183
184 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
185 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
186 (!ipv6_addr_equal(local, &t->parms.raddr) ||
187 !ipv6_addr_is_multicast(local))) ||
188 key != t->parms.i_key ||
189 !(t->dev->flags & IFF_UP))
190 continue;
191
192 if (t->dev->type != ARPHRD_IP6GRE &&
193 t->dev->type != dev_type)
194 continue;
195
196 score = 0;
197 if (t->parms.link != link)
198 score |= 1;
199 if (t->dev->type != dev_type)
200 score |= 2;
201 if (score == 0)
202 return t;
203
204 if (score < cand_score) {
205 cand = t;
206 cand_score = score;
207 }
208 }
209
210 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
211 if (t->parms.i_key != key ||
212 !(t->dev->flags & IFF_UP))
213 continue;
214
215 if (t->dev->type != ARPHRD_IP6GRE &&
216 t->dev->type != dev_type)
217 continue;
218
219 score = 0;
220 if (t->parms.link != link)
221 score |= 1;
222 if (t->dev->type != dev_type)
223 score |= 2;
224 if (score == 0)
225 return t;
226
227 if (score < cand_score) {
228 cand = t;
229 cand_score = score;
230 }
231 }
232
233 if (cand)
234 return cand;
235
236 if (gre_proto == htons(ETH_P_ERSPAN) ||
237 gre_proto == htons(ETH_P_ERSPAN2))
238 t = rcu_dereference(ign->collect_md_tun_erspan);
239 else
240 t = rcu_dereference(ign->collect_md_tun);
241
242 if (t && t->dev->flags & IFF_UP)
243 return t;
244
245 dev = ign->fb_tunnel_dev;
246 if (dev->flags & IFF_UP)
247 return netdev_priv(dev);
248
249 return NULL;
250 }
251
252 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
253 const struct __ip6_tnl_parm *p)
254 {
255 const struct in6_addr *remote = &p->raddr;
256 const struct in6_addr *local = &p->laddr;
257 unsigned int h = HASH_KEY(p->i_key);
258 int prio = 0;
259
260 if (!ipv6_addr_any(local))
261 prio |= 1;
262 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
263 prio |= 2;
264 h ^= HASH_ADDR(remote);
265 }
266
267 return &ign->tunnels[prio][h];
268 }
269
270 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
271 {
272 if (t->parms.collect_md)
273 rcu_assign_pointer(ign->collect_md_tun, t);
274 }
275
276 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
277 {
278 if (t->parms.collect_md)
279 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
280 }
281
282 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
283 {
284 if (t->parms.collect_md)
285 rcu_assign_pointer(ign->collect_md_tun, NULL);
286 }
287
288 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
289 struct ip6_tnl *t)
290 {
291 if (t->parms.collect_md)
292 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
293 }
294
295 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
296 const struct ip6_tnl *t)
297 {
298 return __ip6gre_bucket(ign, &t->parms);
299 }
300
301 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
302 {
303 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
304
305 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
306 rcu_assign_pointer(*tp, t);
307 }
308
309 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
310 {
311 struct ip6_tnl __rcu **tp;
312 struct ip6_tnl *iter;
313
314 for (tp = ip6gre_bucket(ign, t);
315 (iter = rtnl_dereference(*tp)) != NULL;
316 tp = &iter->next) {
317 if (t == iter) {
318 rcu_assign_pointer(*tp, t->next);
319 break;
320 }
321 }
322 }
323
324 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
325 const struct __ip6_tnl_parm *parms,
326 int type)
327 {
328 const struct in6_addr *remote = &parms->raddr;
329 const struct in6_addr *local = &parms->laddr;
330 __be32 key = parms->i_key;
331 int link = parms->link;
332 struct ip6_tnl *t;
333 struct ip6_tnl __rcu **tp;
334 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
335
336 for (tp = __ip6gre_bucket(ign, parms);
337 (t = rtnl_dereference(*tp)) != NULL;
338 tp = &t->next)
339 if (ipv6_addr_equal(local, &t->parms.laddr) &&
340 ipv6_addr_equal(remote, &t->parms.raddr) &&
341 key == t->parms.i_key &&
342 link == t->parms.link &&
343 type == t->dev->type)
344 break;
345
346 return t;
347 }
348
349 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
350 const struct __ip6_tnl_parm *parms, int create)
351 {
352 struct ip6_tnl *t, *nt;
353 struct net_device *dev;
354 char name[IFNAMSIZ];
355 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
356
357 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
358 if (t && create)
359 return NULL;
360 if (t || !create)
361 return t;
362
363 if (parms->name[0])
364 strlcpy(name, parms->name, IFNAMSIZ);
365 else
366 strlcpy(name, "ovs-ip6gre%d", IFNAMSIZ);
367
368 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
369 ip6gre_tunnel_setup);
370 if (!dev)
371 return NULL;
372
373 dev_net_set(dev, net);
374
375 nt = netdev_priv(dev);
376 nt->parms = *parms;
377 dev->rtnl_link_ops = &ip6gre_link_ops;
378
379 nt->dev = dev;
380 nt->net = dev_net(dev);
381
382 if (register_netdevice(dev) < 0)
383 goto failed_free;
384
385 ip6gre_tnl_link_config(nt, 1);
386
387 /* Can use a lockless transmit, unless we generate output sequences */
388 if (!(nt->parms.o_flags & TUNNEL_SEQ))
389 dev->features |= NETIF_F_LLTX;
390
391 dev_hold(dev);
392 ip6gre_tunnel_link(ign, nt);
393 return nt;
394
395 failed_free:
396 free_netdev(dev);
397 return NULL;
398 }
399
400 static void ip6erspan_tunnel_uninit(struct net_device *dev)
401 {
402 struct ip6_tnl *t = netdev_priv(dev);
403 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
404
405 ip6erspan_tunnel_unlink_md(ign, t);
406 ip6gre_tunnel_unlink(ign, t);
407 dst_cache_reset(&t->dst_cache);
408 dev_put(dev);
409 }
410
411 static void ip6gre_tunnel_uninit(struct net_device *dev)
412 {
413 struct ip6_tnl *t = netdev_priv(dev);
414 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
415
416 ip6gre_tunnel_unlink_md(ign, t);
417 ip6gre_tunnel_unlink(ign, t);
418 dst_cache_reset(&t->dst_cache);
419 dev_put(dev);
420 }
421
422
423 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
424 u8 type, u8 code, int offset, __be32 info)
425 {
426 #if 0
427 struct net *net = dev_net(skb->dev);
428 const struct gre_base_hdr *greh;
429 const struct ipv6hdr *ipv6h;
430 int grehlen = sizeof(*greh);
431 struct ip6_tnl *t;
432 int key_off = 0;
433 __be16 flags;
434 __be32 key;
435
436 if (!pskb_may_pull(skb, offset + grehlen))
437 return;
438 greh = (const struct gre_base_hdr *)(skb->data + offset);
439 flags = greh->flags;
440 if (flags & (GRE_VERSION | GRE_ROUTING))
441 return;
442 if (flags & GRE_CSUM)
443 grehlen += 4;
444 if (flags & GRE_KEY) {
445 key_off = grehlen + offset;
446 grehlen += 4;
447 }
448
449 if (!pskb_may_pull(skb, offset + grehlen))
450 return;
451 ipv6h = (const struct ipv6hdr *)skb->data;
452 greh = (const struct gre_base_hdr *)(skb->data + offset);
453 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
454
455 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
456 key, greh->protocol);
457 if (!t)
458 return;
459
460 switch (type) {
461 struct ipv6_tlv_tnl_enc_lim *tel;
462 __u32 teli;
463 case ICMPV6_DEST_UNREACH:
464 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
465 t->parms.name);
466 if (code != ICMPV6_PORT_UNREACH)
467 break;
468 return;
469 case ICMPV6_TIME_EXCEED:
470 if (code == ICMPV6_EXC_HOPLIMIT) {
471 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
472 t->parms.name);
473 break;
474 }
475 return;
476 case ICMPV6_PARAMPROB:
477 teli = 0;
478 if (code == ICMPV6_HDR_FIELD)
479 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
480
481 if (teli && teli == be32_to_cpu(info) - 2) {
482 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
483 if (tel->encap_limit == 0) {
484 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
485 t->parms.name);
486 }
487 } else {
488 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
489 t->parms.name);
490 }
491 return;
492 case ICMPV6_PKT_TOOBIG:
493 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
494 return;
495 case NDISC_REDIRECT:
496 ip6_redirect(skb, net, skb->dev->ifindex, 0,
497 sock_net_uid(net, NULL));
498 return;
499 }
500
501 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
502 t->err_count++;
503 else
504 t->err_count = 1;
505 t->err_time = jiffies;
506 #endif
507 }
508
509 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
510 {
511 const struct ipv6hdr *ipv6h;
512 struct ip6_tnl *tunnel;
513
514 ipv6h = ipv6_hdr(skb);
515 tunnel = ip6gre_tunnel_lookup(skb->dev,
516 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
517 tpi->proto);
518 if (tunnel) {
519 struct metadata_dst *tun_dst = NULL;
520 if (tunnel->parms.collect_md) {
521 __be64 tun_id;
522 __be16 flags;
523
524 flags = tpi->flags;
525 tun_id = key32_to_tunnel_id(tpi->key);
526
527 tun_dst = rpl_ipv6_tun_rx_dst(skb, flags, tun_id, 0);
528 if (!tun_dst)
529 return PACKET_REJECT;
530
531 }
532
533 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, false);
534 kfree(tun_dst);
535 return PACKET_RCVD;
536 }
537
538 return PACKET_RCVD;
539 }
540
541 static int ip6erspan_rcv(struct sk_buff *skb,
542 struct tnl_ptk_info *tpi,
543 int gre_hdr_len)
544 {
545 struct erspan_base_hdr *ershdr;
546 const struct ipv6hdr *ipv6h;
547 struct erspan_md2 *md2;
548 struct ip6_tnl *tunnel;
549 u8 ver;
550
551 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
552 return PACKET_REJECT;
553
554 ipv6h = ipv6_hdr(skb);
555 ershdr = (struct erspan_base_hdr *)skb->data;
556 ver = ershdr->ver;
557 tpi->key = cpu_to_be32(get_session_id(ershdr));
558
559 tunnel = ip6gre_tunnel_lookup(skb->dev,
560 &ipv6h->saddr, &ipv6h->daddr, 0,
561 tpi->proto);
562 if (tunnel) {
563 struct metadata_dst *tun_dst = NULL;
564 int len = erspan_hdr_len(ver);
565
566 if (unlikely(!pskb_may_pull(skb, len)))
567 return PACKET_REJECT;
568
569 if (__iptunnel_pull_header(skb, len,
570 htons(ETH_P_TEB),
571 false, false) < 0)
572 return PACKET_REJECT;
573
574 if (tunnel->parms.collect_md) {
575 struct erspan_metadata *pkt_md, *md;
576 struct ip_tunnel_info *info;
577 unsigned char *gh;
578 __be64 tun_id;
579 __be16 flags;
580
581 tpi->flags |= TUNNEL_KEY;
582 flags = tpi->flags;
583 tun_id = key32_to_tunnel_id(tpi->key);
584
585 tun_dst = rpl_ipv6_tun_rx_dst(skb, flags, tun_id,
586 sizeof(*md));
587 if (!tun_dst)
588 return PACKET_REJECT;
589
590 /* skb can be uncloned in __iptunnel_pull_header, so
591 * old pkt_md is no longer valid and we need to reset
592 * it
593 */
594 gh = skb_network_header(skb) +
595 skb_network_header_len(skb);
596 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
597 sizeof(*ershdr));
598 info = &tun_dst->u.tun_info;
599 md = ip_tunnel_info_opts(info);
600 md->version = ver;
601 md2 = &md->u.md2;
602 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
603 ERSPAN_V2_MDSIZE);
604 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
605 info->options_len = sizeof(*md);
606 }
607
608 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, false);
609 kfree(tun_dst);
610 return PACKET_RCVD;
611 }
612
613 kfree(skb);
614 return PACKET_RCVD;
615 }
616
617 static int gre_rcv(struct sk_buff *skb)
618 {
619 struct tnl_ptk_info tpi;
620 bool csum_err = false;
621 int hdr_len;
622
623 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
624 if (hdr_len < 0)
625 goto drop;
626
627 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
628 goto drop;
629
630 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
631 tpi.proto == htons(ETH_P_ERSPAN2))) {
632 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
633 return 0;
634 goto out;
635 }
636
637 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
638 return 0;
639
640 out:
641 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
642 drop:
643 kfree_skb(skb);
644 return 0;
645 }
646
647 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,7,0)
648 #include "gso.h"
649 /* gre_handle_offloads() has different return type on older kernsl. */
650 static void gre_nop_fix(struct sk_buff *skb) { }
651
652 static void gre_csum_fix(struct sk_buff *skb)
653 {
654 struct gre_base_hdr *greh;
655 __be32 *options;
656 int gre_offset = skb_transport_offset(skb);
657
658 greh = (struct gre_base_hdr *)skb_transport_header(skb);
659 options = ((__be32 *)greh + 1);
660
661 *options = 0;
662 *(__sum16 *)options = csum_fold(skb_checksum(skb, gre_offset,
663 skb->len - gre_offset, 0));
664 }
665
666 #define gre_handle_offloads rpl_gre_handle_offloads
667 static int rpl_gre_handle_offloads(struct sk_buff *skb, bool gre_csum)
668 {
669 int type = gre_csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE;
670 gso_fix_segment_t fix_segment;
671
672 if (gre_csum)
673 fix_segment = gre_csum_fix;
674 else
675 fix_segment = gre_nop_fix;
676
677 return ovs_iptunnel_handle_offloads(skb, type, fix_segment);
678 }
679 #else
680 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
681 {
682 return iptunnel_handle_offloads(skb, csum,
683 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
684 }
685 #endif
686
687 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
688 struct net_device *dev,
689 struct flowi6 *fl6, __u8 *dsfield,
690 int *encap_limit)
691 {
692 const struct iphdr *iph = ip_hdr(skb);
693 struct ip6_tnl *t = netdev_priv(dev);
694
695 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
696 *encap_limit = t->parms.encap_limit;
697
698 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
699
700 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
701 *dsfield = ipv4_get_dsfield(iph);
702 else
703 *dsfield = ip6_tclass(t->parms.flowinfo);
704
705 #ifndef IP6_TNL_F_USE_ORIG_FWMARK
706 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
707 fl6->flowi6_mark = skb->mark;
708 else
709 fl6->flowi6_mark = t->parms.fwmark;
710
711 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
712 #endif
713 }
714
715 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
716 struct net_device *dev,
717 struct flowi6 *fl6, __u8 *dsfield,
718 int *encap_limit)
719 {
720 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
721 struct ip6_tnl *t = netdev_priv(dev);
722 __u16 offset;
723
724 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
725 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
726
727 if (offset > 0) {
728 struct ipv6_tlv_tnl_enc_lim *tel;
729
730 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
731 if (tel->encap_limit == 0) {
732 icmpv6_send(skb, ICMPV6_PARAMPROB,
733 ICMPV6_HDR_FIELD, offset + 2);
734 return -1;
735 }
736 *encap_limit = tel->encap_limit - 1;
737 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
738 *encap_limit = t->parms.encap_limit;
739 }
740
741 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
742
743 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
744 *dsfield = ipv6_get_dsfield(ipv6h);
745 else
746 *dsfield = ip6_tclass(t->parms.flowinfo);
747
748 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
749 fl6->flowlabel |= ip6_flowlabel(ipv6h);
750
751 #ifndef IP6_TNL_F_USE_ORIG_FWMARK
752 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
753 fl6->flowi6_mark = skb->mark;
754 else
755 fl6->flowi6_mark = t->parms.fwmark;
756
757 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
758 #endif
759
760 return 0;
761 }
762
763 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
764 struct net_device *dev, __u8 dsfield,
765 struct flowi6 *fl6, int encap_limit,
766 __u32 *pmtu, __be16 proto)
767 {
768 struct ip6_tnl *tunnel = netdev_priv(dev);
769 struct tnl_ptk_info tpi;
770 __be16 protocol;
771
772 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
773 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
774 else
775 fl6->daddr = tunnel->parms.raddr;
776
777 if (tunnel->parms.o_flags & TUNNEL_SEQ)
778 tunnel->o_seqno++;
779
780 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
781 return -ENOMEM;
782
783 /* Push GRE header. */
784 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
785
786 if (tunnel->parms.collect_md) {
787 struct ip_tunnel_info *tun_info;
788 const struct ip_tunnel_key *key;
789 __be16 flags;
790
791 tun_info = skb_tunnel_info(skb);
792 if (unlikely(!tun_info ||
793 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
794 ip_tunnel_info_af(tun_info) != AF_INET6))
795 return -EINVAL;
796
797 key = &tun_info->key;
798 memset(fl6, 0, sizeof(*fl6));
799 fl6->flowi6_proto = IPPROTO_GRE;
800 fl6->daddr = key->u.ipv6.dst;
801 fl6->flowlabel = key->label;
802 // FIX ME!
803 // fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
804
805 dsfield = key->tos;
806 flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
807 tunnel->tun_hlen = gre_calc_hlen(flags);
808
809 tpi.flags = flags;
810 tpi.proto = protocol;
811 tpi.key = tunnel_id_to_key32(key->tun_id);
812 tpi.seq = htonl(tunnel->o_seqno++);
813 tpi.hdr_len = tunnel->tun_hlen;
814
815 gre_build_header(skb, &tpi, 8);
816 } else {
817 tpi.flags = tunnel->parms.o_flags;
818 tpi.proto = protocol;
819 tpi.key = tunnel->parms.o_key;
820 tpi.seq = htonl(tunnel->o_seqno++);
821 tpi.hdr_len = tunnel->tun_hlen;
822
823 gre_build_header(skb, &tpi, 8);
824 }
825
826 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
827 NEXTHDR_GRE);
828 }
829
830 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
831 {
832 struct ip6_tnl *t = netdev_priv(dev);
833 int encap_limit = -1;
834 struct flowi6 fl6;
835 __u8 dsfield = 0;
836 __u32 mtu;
837 int err;
838
839 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
840
841 if (!t->parms.collect_md)
842 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
843 &dsfield, &encap_limit);
844
845 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
846 if (err)
847 return -1;
848
849 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
850 skb->protocol);
851 if (err != 0) {
852 /* XXX: send ICMP error even if DF is not set. */
853 if (err == -EMSGSIZE)
854 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
855 htonl(mtu));
856 return -1;
857 }
858
859 return 0;
860 }
861
862 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
863 {
864 struct ip6_tnl *t = netdev_priv(dev);
865 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
866 int encap_limit = -1;
867 struct flowi6 fl6;
868 __u8 dsfield = 0;
869 __u32 mtu;
870 int err;
871
872 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
873 return -1;
874
875 if (!t->parms.collect_md &&
876 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
877 return -1;
878
879 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
880 return -1;
881
882 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
883 &mtu, skb->protocol);
884 if (err != 0) {
885 if (err == -EMSGSIZE)
886 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
887 return -1;
888 }
889
890 return 0;
891 }
892
893 /**
894 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
895 * @t: the outgoing tunnel device
896 * @hdr: IPv6 header from the incoming packet
897 *
898 * Description:
899 * Avoid trivial tunneling loop by checking that tunnel exit-point
900 * doesn't match source of incoming packet.
901 *
902 * Return:
903 * 1 if conflict,
904 * 0 else
905 **/
906
907 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
908 const struct ipv6hdr *hdr)
909 {
910 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
911 }
912
913 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
914 {
915 struct ip6_tnl *t = netdev_priv(dev);
916 int encap_limit = -1;
917 struct flowi6 fl6;
918 __u32 mtu;
919 int err;
920
921 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
922 encap_limit = t->parms.encap_limit;
923
924 if (!t->parms.collect_md)
925 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
926
927 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
928 if (err)
929 return err;
930
931 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
932
933 return err;
934 }
935
936 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
937 struct net_device *dev)
938 {
939 struct ip6_tnl *t = netdev_priv(dev);
940 struct net_device_stats *stats = &t->dev->stats;
941 int ret;
942
943 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
944 goto tx_err;
945
946 switch (skb->protocol) {
947 case htons(ETH_P_IP):
948 ret = ip6gre_xmit_ipv4(skb, dev);
949 break;
950 case htons(ETH_P_IPV6):
951 ret = ip6gre_xmit_ipv6(skb, dev);
952 break;
953 default:
954 ret = ip6gre_xmit_other(skb, dev);
955 break;
956 }
957
958 if (ret < 0)
959 goto tx_err;
960
961 return NETDEV_TX_OK;
962
963 tx_err:
964 stats->tx_errors++;
965 stats->tx_dropped++;
966 kfree_skb(skb);
967 return NETDEV_TX_OK;
968 }
969
970 static netdev_tx_t __ip6gre_tunnel_xmit(struct sk_buff *skb)
971 {
972 return ip6gre_tunnel_xmit(skb, skb->dev);
973 }
974
975 static bool erspan_skb_would_panic(struct sk_buff *skb, int erspan_md_size)
976 {
977 /* check if there is enough headroom in packet, if not
978 * drop it. Checking for 8 bytes of gre header space +
979 * erspan base hdr and erspan type specific header.
980 */
981 if (skb_headroom(skb) < (8 + sizeof(struct erspan_base_hdr) +
982 erspan_md_size))
983 return true;
984
985 return false;
986 }
987
988 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
989 struct net_device *dev)
990 {
991 struct ip6_tnl *t = netdev_priv(dev);
992 struct dst_entry *dst = skb_dst(skb);
993 struct ip_tunnel_info *tun_info;
994 const struct ip_tunnel_key *key;
995 struct net_device_stats *stats;
996 struct erspan_metadata *md;
997 struct tnl_ptk_info tpi;
998 bool truncate = false;
999 int encap_limit = -1;
1000 __u8 dsfield = false;
1001 struct flowi6 fl6;
1002 int err = -EINVAL;
1003 __be32 tun_id;
1004 __u32 mtu;
1005 int nhoff;
1006 int thoff;
1007
1008
1009 /* OVS doesn't support native mode ip6 tunnel traffic so
1010 * take an early exit in that case. */
1011 if (!t->parms.collect_md)
1012 goto tx_err;
1013
1014 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
1015 goto tx_err;
1016
1017 if (gre_handle_offloads(skb, false))
1018 goto tx_err;
1019
1020 if (skb->len > dev->mtu + dev->hard_header_len) {
1021 pskb_trim(skb, dev->mtu + dev->hard_header_len);
1022 truncate = true;
1023 }
1024
1025 nhoff = skb_network_header(skb) - skb_mac_header(skb);
1026 if (skb->protocol == htons(ETH_P_IP) &&
1027 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
1028 truncate = true;
1029
1030 thoff = skb_transport_header(skb) - skb_mac_header(skb);
1031 if (skb->protocol == htons(ETH_P_IPV6) &&
1032 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
1033 truncate = true;
1034
1035 if (skb_cow_head(skb, dev->needed_headroom ? : t->hlen))
1036 goto tx_err;
1037
1038 t->parms.o_flags &= ~TUNNEL_KEY;
1039
1040 tun_info = ovs_skb_tunnel_info(skb);
1041 if (unlikely(!tun_info ||
1042 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1043 ip_tunnel_info_af(tun_info) != AF_INET6))
1044 return -EINVAL;
1045
1046 key = &tun_info->key;
1047 memset(&fl6, 0, sizeof(fl6));
1048 fl6.flowi6_proto = IPPROTO_GRE;
1049 fl6.daddr = key->u.ipv6.dst;
1050 fl6.flowlabel = key->label;
1051 // fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1052
1053 dsfield = key->tos;
1054 md = ip_tunnel_info_opts(tun_info);
1055 if (!md)
1056 goto tx_err;
1057
1058 if (erspan_skb_would_panic(skb,
1059 md->version == 1 ?
1060 ERSPAN_V1_MDSIZE : ERSPAN_V2_MDSIZE))
1061 goto tx_err;
1062
1063 tun_id = tunnel_id_to_key32(key->tun_id);
1064 if (md->version == 1) {
1065 erspan_build_header(skb,
1066 ntohl(tun_id),
1067 ntohl(md->u.index), truncate,
1068 false);
1069 tpi.hdr_len = ERSPAN_V1_MDSIZE;
1070 tpi.proto = htons(ETH_P_ERSPAN);
1071 } else if (md->version == 2) {
1072 erspan_build_header_v2(skb,
1073 ntohl(tun_id),
1074 md->u.md2.dir,
1075 get_hwid(&md->u.md2),
1076 truncate, false);
1077 tpi.hdr_len = ERSPAN_V2_MDSIZE;
1078 tpi.proto = htons(ETH_P_ERSPAN2);
1079 } else {
1080 goto tx_err;
1081 }
1082
1083 tpi.flags = TUNNEL_SEQ;
1084 tpi.key = 0;
1085 tpi.seq = htonl(t->o_seqno++);
1086
1087 /* Push GRE header. */
1088 gre_build_header(skb, &tpi, 8);
1089
1090 /* TooBig packet may have updated dst->dev's mtu */
1091 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1092 #ifndef HAVE_DST_OPS_CONFIRM_NEIGH
1093 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1094 #else
1095 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1096 #endif
1097
1098 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1099 NEXTHDR_GRE);
1100 if (err != 0)
1101 goto tx_err;
1102
1103 return NETDEV_TX_OK;
1104
1105 tx_err:
1106 stats = &t->dev->stats;
1107 stats->tx_errors++;
1108 stats->tx_dropped++;
1109 kfree_skb(skb);
1110 return NETDEV_TX_OK;
1111 }
1112
1113 static netdev_tx_t __ip6erspan_tunnel_xmit(struct sk_buff *skb)
1114 {
1115 return ip6erspan_tunnel_xmit(skb, skb->dev);
1116 }
1117
1118 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1119 {
1120 struct net_device *dev = t->dev;
1121 struct __ip6_tnl_parm *p = &t->parms;
1122 struct flowi6 *fl6 = &t->fl.u.ip6;
1123
1124 if (dev->type != ARPHRD_ETHER) {
1125 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1126 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1127 }
1128
1129 /* Set up flowi template */
1130 fl6->saddr = p->laddr;
1131 fl6->daddr = p->raddr;
1132 fl6->flowi6_oif = p->link;
1133 fl6->flowlabel = 0;
1134 fl6->flowi6_proto = IPPROTO_GRE;
1135
1136 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1137 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1138 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1139 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1140
1141 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1142 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1143
1144 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1145 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1146 dev->flags |= IFF_POINTOPOINT;
1147 else
1148 dev->flags &= ~IFF_POINTOPOINT;
1149 }
1150
1151 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1152 int t_hlen)
1153 {
1154 const struct __ip6_tnl_parm *p = &t->parms;
1155 struct net_device *dev = t->dev;
1156
1157 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1158 int strict = (ipv6_addr_type(&p->raddr) &
1159 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1160
1161 struct rt6_info *rt = rt6_lookup(t->net,
1162 &p->raddr, &p->laddr,
1163 p->link, strict);
1164
1165 if (!rt)
1166 return;
1167
1168 if (rt->dst.dev) {
1169 dev->hard_header_len = rt->dst.dev->hard_header_len +
1170 t_hlen;
1171
1172 if (set_mtu) {
1173 dev->mtu = rt->dst.dev->mtu - t_hlen;
1174 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1175 dev->mtu -= 8;
1176 if (dev->type == ARPHRD_ETHER)
1177 dev->mtu -= ETH_HLEN;
1178
1179 if (dev->mtu < IPV6_MIN_MTU)
1180 dev->mtu = IPV6_MIN_MTU;
1181 }
1182 }
1183 ip6_rt_put(rt);
1184 }
1185 }
1186
1187 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1188 {
1189 int t_hlen;
1190
1191 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1192 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1193
1194 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1195 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1196 return t_hlen;
1197 }
1198
1199 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1200 {
1201 ip6gre_tnl_link_config_common(t);
1202 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1203 }
1204
1205 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1206 const struct __ip6_tnl_parm *p)
1207 {
1208 t->parms.laddr = p->laddr;
1209 t->parms.raddr = p->raddr;
1210 t->parms.flags = p->flags;
1211 t->parms.hop_limit = p->hop_limit;
1212 t->parms.encap_limit = p->encap_limit;
1213 t->parms.flowinfo = p->flowinfo;
1214 t->parms.link = p->link;
1215 t->parms.proto = p->proto;
1216 t->parms.i_key = p->i_key;
1217 t->parms.o_key = p->o_key;
1218 t->parms.i_flags = p->i_flags;
1219 t->parms.o_flags = p->o_flags;
1220 t->parms.fwmark = p->fwmark;
1221 dst_cache_reset(&t->dst_cache);
1222 }
1223
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
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
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
1267 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1268 struct ifreq *ifr, int cmd)
1269 {
1270 int err = 0;
1271 struct ip6_tnl_parm2 p;
1272 struct __ip6_tnl_parm p1;
1273 struct ip6_tnl *t = netdev_priv(dev);
1274 struct net *net = t->net;
1275 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1276
1277 memset(&p1, 0, sizeof(p1));
1278
1279 switch (cmd) {
1280 case SIOCGETTUNNEL:
1281 if (dev == ign->fb_tunnel_dev) {
1282 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1283 err = -EFAULT;
1284 break;
1285 }
1286 ip6gre_tnl_parm_from_user(&p1, &p);
1287 t = ip6gre_tunnel_locate(net, &p1, 0);
1288 if (!t)
1289 t = netdev_priv(dev);
1290 }
1291 memset(&p, 0, sizeof(p));
1292 ip6gre_tnl_parm_to_user(&p, &t->parms);
1293 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1294 err = -EFAULT;
1295 break;
1296
1297 case SIOCADDTUNNEL:
1298 case SIOCCHGTUNNEL:
1299 err = -EPERM;
1300 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1301 goto done;
1302
1303 err = -EFAULT;
1304 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1305 goto done;
1306
1307 err = -EINVAL;
1308 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1309 goto done;
1310
1311 if (!(p.i_flags&GRE_KEY))
1312 p.i_key = 0;
1313 if (!(p.o_flags&GRE_KEY))
1314 p.o_key = 0;
1315
1316 ip6gre_tnl_parm_from_user(&p1, &p);
1317 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1318
1319 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1320 if (t) {
1321 if (t->dev != dev) {
1322 err = -EEXIST;
1323 break;
1324 }
1325 } else {
1326 t = netdev_priv(dev);
1327
1328 ip6gre_tunnel_unlink(ign, t);
1329 synchronize_net();
1330 ip6gre_tnl_change(t, &p1, 1);
1331 ip6gre_tunnel_link(ign, t);
1332 netdev_state_change(dev);
1333 }
1334 }
1335
1336 if (t) {
1337 err = 0;
1338
1339 memset(&p, 0, sizeof(p));
1340 ip6gre_tnl_parm_to_user(&p, &t->parms);
1341 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1342 err = -EFAULT;
1343 } else
1344 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1345 break;
1346
1347 case SIOCDELTUNNEL:
1348 err = -EPERM;
1349 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1350 goto done;
1351
1352 if (dev == ign->fb_tunnel_dev) {
1353 err = -EFAULT;
1354 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1355 goto done;
1356 err = -ENOENT;
1357 ip6gre_tnl_parm_from_user(&p1, &p);
1358 t = ip6gre_tunnel_locate(net, &p1, 0);
1359 if (!t)
1360 goto done;
1361 err = -EPERM;
1362 if (t == netdev_priv(ign->fb_tunnel_dev))
1363 goto done;
1364 dev = t->dev;
1365 }
1366 unregister_netdevice(dev);
1367 err = 0;
1368 break;
1369
1370 default:
1371 err = -EINVAL;
1372 }
1373
1374 done:
1375 return err;
1376 }
1377
1378 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1379 unsigned short type, const void *daddr,
1380 const void *saddr, unsigned int len)
1381 {
1382 struct ip6_tnl *t = netdev_priv(dev);
1383 struct ipv6hdr *ipv6h;
1384 __be16 *p;
1385
1386 ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen + sizeof(*ipv6h));
1387 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1388 t->fl.u.ip6.flowlabel,
1389 true, &t->fl.u.ip6));
1390 ipv6h->hop_limit = t->parms.hop_limit;
1391 ipv6h->nexthdr = NEXTHDR_GRE;
1392 ipv6h->saddr = t->parms.laddr;
1393 ipv6h->daddr = t->parms.raddr;
1394
1395 p = (__be16 *)(ipv6h + 1);
1396 p[0] = t->parms.o_flags;
1397 p[1] = htons(type);
1398
1399 /*
1400 * Set the source hardware address.
1401 */
1402
1403 if (saddr)
1404 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1405 if (daddr)
1406 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1407 if (!ipv6_addr_any(&ipv6h->daddr))
1408 return t->hlen;
1409
1410 return -t->hlen;
1411 }
1412
1413 static const struct header_ops ip6gre_header_ops = {
1414 .create = ip6gre_header,
1415 };
1416
1417 static const struct net_device_ops ip6gre_netdev_ops = {
1418 .ndo_init = ip6gre_tunnel_init,
1419 .ndo_uninit = ip6gre_tunnel_uninit,
1420 .ndo_start_xmit = ip6gre_tunnel_xmit,
1421 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1422 #ifdef HAVE_RHEL7_MAX_MTU
1423 .ndo_size = sizeof(struct net_device_ops),
1424 .extended.ndo_change_mtu = ip6_tnl_change_mtu,
1425 #else
1426 .ndo_change_mtu = ip6_tnl_change_mtu,
1427 #endif
1428 .ndo_get_stats64 = ip_tunnel_get_stats64,
1429 #ifdef HAVE_NDO_GET_IFLINK
1430 .ndo_get_iflink = ip6_tnl_get_iflink,
1431 #endif
1432 };
1433
1434 #ifdef HAVE_NEEDS_FREE_NETDEV
1435 static void ip6gre_dev_free(struct net_device *dev)
1436 {
1437 struct ip6_tnl *t = netdev_priv(dev);
1438
1439 dst_cache_destroy(&t->dst_cache);
1440 free_percpu(dev->tstats);
1441 }
1442
1443 #endif
1444 static void ip6gre_tunnel_setup(struct net_device *dev)
1445 {
1446 dev->netdev_ops = &ip6gre_netdev_ops;
1447 #ifndef HAVE_NEEDS_FREE_NETDEV
1448 dev->destructor = free_netdev;
1449 #else
1450 dev->needs_free_netdev = true;
1451 dev->priv_destructor = ip6gre_dev_free;
1452 #endif
1453
1454 dev->type = ARPHRD_IP6GRE;
1455
1456 dev->flags |= IFF_NOARP;
1457 dev->addr_len = sizeof(struct in6_addr);
1458 netif_keep_dst(dev);
1459 /* This perm addr will be used as interface identifier by IPv6 */
1460 dev->addr_assign_type = NET_ADDR_RANDOM;
1461 eth_random_addr(dev->perm_addr);
1462 }
1463
1464 #define GRE6_FEATURES (NETIF_F_SG | \
1465 NETIF_F_FRAGLIST | \
1466 NETIF_F_HIGHDMA | \
1467 NETIF_F_HW_CSUM)
1468
1469 static void ip6gre_tnl_init_features(struct net_device *dev)
1470 {
1471 struct ip6_tnl *nt = netdev_priv(dev);
1472
1473 dev->features |= GRE6_FEATURES;
1474 dev->hw_features |= GRE6_FEATURES;
1475
1476 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1477 /* TCP offload with GRE SEQ is not supported, nor
1478 * can we support 2 levels of outer headers requiring
1479 * an update.
1480 */
1481 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1482 nt->encap.type == TUNNEL_ENCAP_NONE) {
1483 dev->features |= NETIF_F_GSO_SOFTWARE;
1484 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1485 }
1486
1487 /* Can use a lockless transmit, unless we generate
1488 * output sequences
1489 */
1490 dev->features |= NETIF_F_LLTX;
1491 }
1492 }
1493
1494 static int ip6gre_tunnel_init_common(struct net_device *dev)
1495 {
1496 struct ip6_tnl *tunnel;
1497 int ret;
1498 int t_hlen;
1499
1500 tunnel = netdev_priv(dev);
1501
1502 tunnel->dev = dev;
1503 tunnel->net = dev_net(dev);
1504 strcpy(tunnel->parms.name, dev->name);
1505
1506 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1507 if (!dev->tstats)
1508 return -ENOMEM;
1509
1510 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1511 if (ret) {
1512 free_percpu(dev->tstats);
1513 dev->tstats = NULL;
1514 return ret;
1515 }
1516
1517 t_hlen = ip6gre_calc_hlen(tunnel);
1518 dev->mtu = ETH_DATA_LEN - t_hlen;
1519 if (dev->type == ARPHRD_ETHER)
1520 dev->mtu -= ETH_HLEN;
1521 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1522 dev->mtu -= 8;
1523
1524 if (tunnel->parms.collect_md) {
1525 dev->features |= NETIF_F_NETNS_LOCAL;
1526 netif_keep_dst(dev);
1527 }
1528 ip6gre_tnl_init_features(dev);
1529
1530 return 0;
1531 }
1532
1533 static int ip6gre_tunnel_init(struct net_device *dev)
1534 {
1535 struct ip6_tnl *tunnel;
1536 int ret;
1537
1538 ret = ip6gre_tunnel_init_common(dev);
1539 if (ret)
1540 return ret;
1541
1542 tunnel = netdev_priv(dev);
1543
1544 if (tunnel->parms.collect_md)
1545 return 0;
1546
1547 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1548 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1549
1550 if (ipv6_addr_any(&tunnel->parms.raddr))
1551 dev->header_ops = &ip6gre_header_ops;
1552
1553 return 0;
1554 }
1555
1556 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1557 {
1558 struct ip6_tnl *tunnel = netdev_priv(dev);
1559
1560 tunnel->dev = dev;
1561 tunnel->net = dev_net(dev);
1562 strcpy(tunnel->parms.name, dev->name);
1563
1564 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1565
1566 dev_hold(dev);
1567 }
1568
1569 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1570 .handler = gre_rcv,
1571 .err_handler = ip6gre_err,
1572 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1573 };
1574
1575 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1576 {
1577 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1578 struct net_device *dev, *aux;
1579 int prio;
1580
1581 for_each_netdev_safe(net, dev, aux)
1582 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1583 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1584 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1585 unregister_netdevice_queue(dev, head);
1586
1587 for (prio = 0; prio < 4; prio++) {
1588 int h;
1589 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1590 struct ip6_tnl *t;
1591
1592 t = rtnl_dereference(ign->tunnels[prio][h]);
1593
1594 while (t) {
1595 /* If dev is in the same netns, it has already
1596 * been added to the list by the previous loop.
1597 */
1598 if (!net_eq(dev_net(t->dev), net))
1599 unregister_netdevice_queue(t->dev,
1600 head);
1601 t = rtnl_dereference(t->next);
1602 }
1603 }
1604 }
1605 }
1606
1607 static int __net_init ip6gre_init_net(struct net *net)
1608 {
1609 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1610 int err;
1611
1612 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl),
1613 "ovs-ip6gre0",
1614 NET_NAME_UNKNOWN,
1615 ip6gre_tunnel_setup);
1616 if (!ign->fb_tunnel_dev) {
1617 err = -ENOMEM;
1618 goto err_alloc_dev;
1619 }
1620 dev_net_set(ign->fb_tunnel_dev, net);
1621 /* FB netdevice is special: we have one, and only one per netns.
1622 * Allowing to move it to another netns is clearly unsafe.
1623 */
1624 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1625
1626
1627 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1628 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1629
1630 err = register_netdev(ign->fb_tunnel_dev);
1631 if (err)
1632 goto err_reg_dev;
1633
1634 rcu_assign_pointer(ign->tunnels_wc[0],
1635 netdev_priv(ign->fb_tunnel_dev));
1636 return 0;
1637
1638 err_reg_dev:
1639 free_netdev(ign->fb_tunnel_dev);
1640 err_alloc_dev:
1641 return err;
1642 }
1643
1644 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1645 {
1646 struct net *net;
1647 LIST_HEAD(list);
1648
1649 rtnl_lock();
1650 list_for_each_entry(net, net_list, exit_list)
1651 ip6gre_destroy_tunnels(net, &list);
1652 unregister_netdevice_many(&list);
1653 rtnl_unlock();
1654 }
1655
1656 enum {
1657 #ifndef HAVE_IFLA_GRE_ENCAP_DPORT
1658 IFLA_GRE_ENCAP_TYPE = IFLA_GRE_FLAGS + 1,
1659 IFLA_GRE_ENCAP_FLAGS,
1660 IFLA_GRE_ENCAP_SPORT,
1661 IFLA_GRE_ENCAP_DPORT,
1662 #endif
1663 #ifndef HAVE_IFLA_GRE_COLLECT_METADATA
1664 IFLA_GRE_COLLECT_METADATA = IFLA_GRE_ENCAP_DPORT + 1,
1665 #endif
1666 #ifndef HAVE_IFLA_GRE_IGNORE_DF
1667 IFLA_GRE_IGNORE_DF = IFLA_GRE_COLLECT_METADATA + 1,
1668 #endif
1669 #ifndef HAVE_IFLA_GRE_FWMARK
1670 IFLA_GRE_FWMARK = IFLA_GRE_IGNORE_DF + 1,
1671 #endif
1672 #ifndef HAVE_IFLA_GRE_ERSPAN_INDEX
1673 IFLA_GRE_ERSPAN_INDEX = IFLA_GRE_FWMARK + 1,
1674 #endif
1675 #ifndef HAVE_IFLA_GRE_ERSPAN_HWID
1676 IFLA_GRE_ERSPAN_VER = IFLA_GRE_ERSPAN_INDEX + 1,
1677 IFLA_GRE_ERSPAN_DIR,
1678 IFLA_GRE_ERSPAN_HWID,
1679 #endif
1680 };
1681
1682 #define RPL_IFLA_GRE_MAX (IFLA_GRE_ERSPAN_HWID + 1)
1683
1684 static struct pernet_operations ip6gre_net_ops = {
1685 .init = ip6gre_init_net,
1686 .exit_batch = ip6gre_exit_batch_net,
1687 .id = &ip6gre_net_id,
1688 .size = sizeof(struct ip6gre_net),
1689 };
1690 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
1691 static int rpl_ip6gre_tunnel_validate(struct nlattr *tb[],
1692 struct nlattr *data[],
1693 struct netlink_ext_ack *extack)
1694 #else
1695 static int rpl_ip6gre_tunnel_validate(struct nlattr *tb[],
1696 struct nlattr *data[])
1697 #endif
1698 {
1699 __be16 flags;
1700
1701 if (!data)
1702 return 0;
1703
1704 flags = 0;
1705 if (data[IFLA_GRE_IFLAGS])
1706 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1707 if (data[IFLA_GRE_OFLAGS])
1708 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1709 if (flags & (GRE_VERSION|GRE_ROUTING))
1710 return -EINVAL;
1711
1712 return 0;
1713 }
1714 #define ip6gre_tunnel_validate rpl_ip6gre_tunnel_validate
1715
1716 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
1717 static int rpl_ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1718 struct netlink_ext_ack *extack)
1719 #else
1720 static int rpl_ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1721 #endif
1722 {
1723 struct in6_addr daddr;
1724
1725 if (tb[IFLA_ADDRESS]) {
1726 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1727 return -EINVAL;
1728 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1729 return -EADDRNOTAVAIL;
1730 }
1731
1732 if (!data)
1733 goto out;
1734
1735 if (data[IFLA_GRE_REMOTE]) {
1736 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1737 if (ipv6_addr_any(&daddr))
1738 return -EINVAL;
1739 }
1740
1741 out:
1742 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
1743 return ip6gre_tunnel_validate(tb, data, extack);
1744 #else
1745 return ip6gre_tunnel_validate(tb, data);
1746 #endif
1747 }
1748 #define ip6gre_tap_validate rpl_ip6gre_tap_validate
1749
1750 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
1751 static int rpl_ip6erspan_tap_validate(struct nlattr *tb[],
1752 struct nlattr *data[],
1753 struct netlink_ext_ack *extack)
1754 #else
1755 static int rpl_ip6erspan_tap_validate(struct nlattr *tb[],
1756 struct nlattr *data[])
1757 #endif
1758 {
1759 __be16 flags = 0;
1760 int ret, ver = 0;
1761
1762 if (!data)
1763 return 0;
1764
1765 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
1766 ret = ip6gre_tap_validate(tb, data, extack);
1767 #else
1768 ret = ip6gre_tap_validate(tb, data);
1769 #endif
1770 if (ret)
1771 return ret;
1772
1773 /* ERSPAN should only have GRE sequence and key flag */
1774 if (data[IFLA_GRE_OFLAGS])
1775 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1776 if (data[IFLA_GRE_IFLAGS])
1777 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1778 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1779 flags != (GRE_SEQ | GRE_KEY))
1780 return -EINVAL;
1781
1782 /* ERSPAN Session ID only has 10-bit. Since we reuse
1783 * 32-bit key field as ID, check it's range.
1784 */
1785 if (data[IFLA_GRE_IKEY] &&
1786 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1787 return -EINVAL;
1788
1789 if (data[IFLA_GRE_OKEY] &&
1790 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1791 return -EINVAL;
1792
1793 if (data[IFLA_GRE_ERSPAN_VER]) {
1794 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1795 if (ver != 1 && ver != 2)
1796 return -EINVAL;
1797 }
1798
1799 if (ver == 1) {
1800 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1801 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1802
1803 if (index & ~INDEX_MASK)
1804 return -EINVAL;
1805 }
1806 } else if (ver == 2) {
1807 if (data[IFLA_GRE_ERSPAN_DIR]) {
1808 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1809
1810 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1811 return -EINVAL;
1812 }
1813
1814 if (data[IFLA_GRE_ERSPAN_HWID]) {
1815 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1816
1817 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1818 return -EINVAL;
1819 }
1820 }
1821
1822 return 0;
1823 }
1824 #define ip6erspan_tap_validate rpl_ip6erspan_tap_validate
1825
1826 static void ip6gre_netlink_parms(struct nlattr *data[],
1827 struct __ip6_tnl_parm *parms)
1828 {
1829 #if 0
1830 /* Do not use in case of OVS - our vport needs to set a parm
1831 * directly and this erases it
1832 */
1833 memset(parms, 0, sizeof(*parms));
1834
1835 #endif
1836 if (!data)
1837 return;
1838
1839 if (data[IFLA_GRE_LINK])
1840 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1841
1842 if (data[IFLA_GRE_IFLAGS])
1843 parms->i_flags = gre_flags_to_tnl_flags(
1844 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1845
1846 if (data[IFLA_GRE_OFLAGS])
1847 parms->o_flags = gre_flags_to_tnl_flags(
1848 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1849
1850 if (data[IFLA_GRE_IKEY])
1851 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1852
1853 if (data[IFLA_GRE_OKEY])
1854 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1855
1856 if (data[IFLA_GRE_LOCAL])
1857 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1858
1859 if (data[IFLA_GRE_REMOTE])
1860 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1861
1862 if (data[IFLA_GRE_TTL])
1863 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1864
1865 if (data[IFLA_GRE_ENCAP_LIMIT])
1866 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1867
1868 if (data[IFLA_GRE_FLOWINFO])
1869 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1870
1871 if (data[IFLA_GRE_FLAGS])
1872 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1873
1874 if (data[IFLA_GRE_FWMARK])
1875 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1876
1877 if (data[IFLA_GRE_COLLECT_METADATA])
1878 parms->collect_md = true;
1879
1880 parms->erspan_ver = 1;
1881 if (data[IFLA_GRE_ERSPAN_VER])
1882 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1883
1884 if (parms->erspan_ver == 1) {
1885 if (data[IFLA_GRE_ERSPAN_INDEX])
1886 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1887 } else if (parms->erspan_ver == 2) {
1888 if (data[IFLA_GRE_ERSPAN_DIR])
1889 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1890 if (data[IFLA_GRE_ERSPAN_HWID])
1891 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1892 }
1893 }
1894
1895 static int ip6gre_tap_init(struct net_device *dev)
1896 {
1897 int ret;
1898
1899 ret = ip6gre_tunnel_init_common(dev);
1900 if (ret)
1901 return ret;
1902
1903 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1904
1905 return 0;
1906 }
1907
1908 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1909 .ndo_init = ip6gre_tap_init,
1910 .ndo_uninit = ip6gre_tunnel_uninit,
1911 .ndo_start_xmit = ip6gre_tunnel_xmit,
1912 .ndo_set_mac_address = eth_mac_addr,
1913 .ndo_validate_addr = eth_validate_addr,
1914 #ifdef HAVE_RHEL7_MAX_MTU
1915 .ndo_size = sizeof(struct net_device_ops),
1916 .extended.ndo_change_mtu = ip6_tnl_change_mtu,
1917 #else
1918 .ndo_change_mtu = ip6_tnl_change_mtu,
1919 #endif
1920 .ndo_get_stats64 = ip_tunnel_get_stats64,
1921 #ifdef HAVE_NDO_GET_IFLINK
1922 .ndo_get_iflink = ip6_tnl_get_iflink,
1923 #endif
1924 };
1925
1926 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1927 {
1928 int t_hlen;
1929
1930 tunnel->tun_hlen = 8;
1931 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1932 erspan_hdr_len(tunnel->parms.erspan_ver);
1933
1934 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1935 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1936 return t_hlen;
1937 }
1938
1939 static int ip6erspan_tap_init(struct net_device *dev)
1940 {
1941 struct ip6_tnl *tunnel;
1942 int t_hlen;
1943 int ret;
1944
1945 tunnel = netdev_priv(dev);
1946
1947 tunnel->dev = dev;
1948 tunnel->net = dev_net(dev);
1949 strcpy(tunnel->parms.name, dev->name);
1950
1951 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1952 if (!dev->tstats)
1953 return -ENOMEM;
1954
1955 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1956 if (ret) {
1957 free_percpu(dev->tstats);
1958 dev->tstats = NULL;
1959 return ret;
1960 }
1961
1962 t_hlen = ip6erspan_calc_hlen(tunnel);
1963 dev->mtu = ETH_DATA_LEN - t_hlen;
1964 if (dev->type == ARPHRD_ETHER)
1965 dev->mtu -= ETH_HLEN;
1966 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1967 dev->mtu -= 8;
1968
1969 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1970 tunnel = netdev_priv(dev);
1971 ip6erspan_tnl_link_config(tunnel, 1);
1972
1973 return 0;
1974 }
1975
1976 static const struct net_device_ops ip6erspan_netdev_ops = {
1977 .ndo_init = ip6erspan_tap_init,
1978 .ndo_uninit = ip6erspan_tunnel_uninit,
1979 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1980 .ndo_set_mac_address = eth_mac_addr,
1981 .ndo_validate_addr = eth_validate_addr,
1982 #ifdef HAVE_RHEL7_MAX_MTU
1983 .ndo_size = sizeof(struct net_device_ops),
1984 .extended.ndo_change_mtu = ip6_tnl_change_mtu,
1985 #else
1986 .ndo_change_mtu = ip6_tnl_change_mtu,
1987 #endif
1988 .ndo_get_stats64 = ip_tunnel_get_stats64,
1989 #ifdef HAVE_NDO_GET_IFLINK
1990 .ndo_get_iflink = ip6_tnl_get_iflink,
1991 #endif
1992 };
1993
1994 static void ip6gre_tap_setup(struct net_device *dev)
1995 {
1996
1997 ether_setup(dev);
1998 #ifdef HAVE_NET_DEVICE_MAX_MTU
1999 dev->max_mtu = 0;
2000 #endif
2001 dev->netdev_ops = &ip6gre_tap_netdev_ops;
2002 #ifndef HAVE_NEEDS_FREE_NETDEV
2003 dev->destructor = free_netdev;
2004 #else
2005 dev->needs_free_netdev = true;
2006 dev->priv_destructor = ip6gre_dev_free;
2007 #endif
2008
2009 dev->features |= NETIF_F_NETNS_LOCAL;
2010 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2011 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2012 netif_keep_dst(dev);
2013 }
2014
2015 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
2016 struct ip_tunnel_encap *ipencap)
2017 {
2018 bool ret = false;
2019
2020 memset(ipencap, 0, sizeof(*ipencap));
2021
2022 if (!data)
2023 return ret;
2024
2025 if (data[IFLA_GRE_ENCAP_TYPE]) {
2026 ret = true;
2027 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
2028 }
2029
2030 if (data[IFLA_GRE_ENCAP_FLAGS]) {
2031 ret = true;
2032 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
2033 }
2034
2035 if (data[IFLA_GRE_ENCAP_SPORT]) {
2036 ret = true;
2037 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
2038 }
2039
2040 if (data[IFLA_GRE_ENCAP_DPORT]) {
2041 ret = true;
2042 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
2043 }
2044
2045 return ret;
2046 }
2047
2048 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2049 static int rpl_ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
2050 struct nlattr *tb[], struct nlattr *data[],
2051 struct netlink_ext_ack *extack)
2052 #else
2053 static int rpl_ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
2054 struct nlattr *tb[], struct nlattr *data[])
2055 #endif
2056 {
2057 struct ip6_tnl *nt;
2058 struct ip_tunnel_encap ipencap;
2059 int err;
2060
2061 nt = netdev_priv(dev);
2062
2063 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2064 int err = ip6_tnl_encap_setup(nt, &ipencap);
2065
2066 if (err < 0)
2067 return err;
2068 }
2069
2070 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
2071 eth_hw_addr_random(dev);
2072
2073 nt->dev = dev;
2074 nt->net = dev_net(dev);
2075
2076 err = register_netdevice(dev);
2077 if (err)
2078 goto out;
2079
2080 if (tb[IFLA_MTU])
2081 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2082
2083 dev_hold(dev);
2084
2085 out:
2086 return err;
2087 }
2088 #define ip6gre_newlink_common rpl_ip6gre_newlink_common
2089
2090 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2091 static int rpl_ip6gre_newlink(struct net *src_net, struct net_device *dev,
2092 struct nlattr *tb[], struct nlattr *data[],
2093 struct netlink_ext_ack *extack)
2094 #else
2095 static int rpl_ip6gre_newlink(struct net *src_net, struct net_device *dev,
2096 struct nlattr *tb[], struct nlattr *data[])
2097 #endif
2098 {
2099 struct ip6_tnl *nt = netdev_priv(dev);
2100 struct net *net = dev_net(dev);
2101 struct ip6gre_net *ign;
2102 int err;
2103
2104 ip6gre_netlink_parms(data, &nt->parms);
2105 ign = net_generic(net, ip6gre_net_id);
2106
2107 if (nt->parms.collect_md) {
2108 if (rtnl_dereference(ign->collect_md_tun))
2109 return -EEXIST;
2110 } else {
2111 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2112 return -EEXIST;
2113 }
2114
2115 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2116 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2117 #else
2118 err = ip6gre_newlink_common(src_net, dev, tb, data);
2119 #endif
2120 if (!err) {
2121 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2122 ip6gre_tunnel_link_md(ign, nt);
2123 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2124 }
2125 return err;
2126 }
2127
2128 #define ip6gre_newlink rpl_ip6gre_newlink
2129
2130 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2131 static struct ip6_tnl *
2132 rpl_ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2133 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2134 struct netlink_ext_ack *extack)
2135 #else
2136 static struct ip6_tnl *
2137 rpl_ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2138 struct nlattr *data[], struct __ip6_tnl_parm *p_p)
2139 #endif
2140 {
2141 struct ip6_tnl *t, *nt = netdev_priv(dev);
2142 struct net *net = nt->net;
2143 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2144 struct ip_tunnel_encap ipencap;
2145
2146 if (dev == ign->fb_tunnel_dev)
2147 return ERR_PTR(-EINVAL);
2148
2149 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2150 int err = ip6_tnl_encap_setup(nt, &ipencap);
2151
2152 if (err < 0)
2153 return ERR_PTR(err);
2154 }
2155
2156 ip6gre_netlink_parms(data, p_p);
2157
2158 t = ip6gre_tunnel_locate(net, p_p, 0);
2159
2160 if (t) {
2161 if (t->dev != dev)
2162 return ERR_PTR(-EEXIST);
2163 } else {
2164 t = nt;
2165 }
2166
2167 return t;
2168 }
2169 #define ip6gre_changelink_common rpl_ip6gre_changelink_common
2170
2171 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2172 static int rpl_ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2173 struct nlattr *data[],
2174 struct netlink_ext_ack *extack)
2175 #else
2176 static int rpl_ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2177 struct nlattr *data[])
2178 #endif
2179 {
2180 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2181 struct __ip6_tnl_parm p;
2182 struct ip6_tnl *t;
2183
2184 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2185 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2186 #else
2187 t = ip6gre_changelink_common(dev, tb, data, &p);
2188 #endif
2189 if (IS_ERR(t))
2190 return PTR_ERR(t);
2191
2192 ip6gre_tunnel_unlink_md(ign, t);
2193 ip6gre_tunnel_unlink(ign, t);
2194 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2195 ip6gre_tunnel_link_md(ign, t);
2196 ip6gre_tunnel_link(ign, t);
2197 return 0;
2198 }
2199 #define ip6gre_changelink rpl_ip6gre_changelink
2200
2201 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2202 {
2203 struct net *net = dev_net(dev);
2204 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2205
2206 if (dev != ign->fb_tunnel_dev)
2207 unregister_netdevice_queue(dev, head);
2208 }
2209
2210 static size_t ip6gre_get_size(const struct net_device *dev)
2211 {
2212 return
2213 /* IFLA_GRE_LINK */
2214 nla_total_size(4) +
2215 /* IFLA_GRE_IFLAGS */
2216 nla_total_size(2) +
2217 /* IFLA_GRE_OFLAGS */
2218 nla_total_size(2) +
2219 /* IFLA_GRE_IKEY */
2220 nla_total_size(4) +
2221 /* IFLA_GRE_OKEY */
2222 nla_total_size(4) +
2223 /* IFLA_GRE_LOCAL */
2224 nla_total_size(sizeof(struct in6_addr)) +
2225 /* IFLA_GRE_REMOTE */
2226 nla_total_size(sizeof(struct in6_addr)) +
2227 /* IFLA_GRE_TTL */
2228 nla_total_size(1) +
2229 /* IFLA_GRE_ENCAP_LIMIT */
2230 nla_total_size(1) +
2231 /* IFLA_GRE_FLOWINFO */
2232 nla_total_size(4) +
2233 /* IFLA_GRE_FLAGS */
2234 nla_total_size(4) +
2235 /* IFLA_GRE_ENCAP_TYPE */
2236 nla_total_size(2) +
2237 /* IFLA_GRE_ENCAP_FLAGS */
2238 nla_total_size(2) +
2239 /* IFLA_GRE_ENCAP_SPORT */
2240 nla_total_size(2) +
2241 /* IFLA_GRE_ENCAP_DPORT */
2242 nla_total_size(2) +
2243 /* IFLA_GRE_COLLECT_METADATA */
2244 nla_total_size(0) +
2245 /* IFLA_GRE_FWMARK */
2246 nla_total_size(4) +
2247 /* IFLA_GRE_ERSPAN_INDEX */
2248 nla_total_size(4) +
2249 0;
2250 }
2251
2252 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2253 {
2254 struct ip6_tnl *t = netdev_priv(dev);
2255 struct __ip6_tnl_parm *p = &t->parms;
2256
2257 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2258 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2259 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2260 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2261 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2262 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2263 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2264 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2265 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2266 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2267 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2268 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2269 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2270 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2271 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2272 goto nla_put_failure;
2273
2274 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2275 t->encap.type) ||
2276 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2277 t->encap.sport) ||
2278 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2279 t->encap.dport) ||
2280 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2281 t->encap.flags))
2282 goto nla_put_failure;
2283
2284 if (p->collect_md) {
2285 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2286 goto nla_put_failure;
2287 }
2288
2289 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2290 goto nla_put_failure;
2291
2292 if (p->erspan_ver == 1) {
2293 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2294 goto nla_put_failure;
2295 } else if (p->erspan_ver == 2) {
2296 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2297 goto nla_put_failure;
2298 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2299 goto nla_put_failure;
2300 }
2301
2302 return 0;
2303
2304 nla_put_failure:
2305 return -EMSGSIZE;
2306 }
2307
2308 static const struct nla_policy ip6gre_policy[RPL_IFLA_GRE_MAX + 1] = {
2309 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2310 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2311 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2312 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2313 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2314 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2315 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2316 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2317 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2318 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2319 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2320 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2321 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2322 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2323 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2324 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2325 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2326 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2327 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2328 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2329 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2330 };
2331
2332 static void ip6erspan_tap_setup(struct net_device *dev)
2333 {
2334 ether_setup(dev);
2335
2336 dev->netdev_ops = &ip6erspan_netdev_ops;
2337 #ifndef HAVE_NEEDS_FREE_NETDEV
2338 dev->destructor = free_netdev;
2339 #else
2340 dev->needs_free_netdev = true;
2341 dev->priv_destructor = ip6gre_dev_free;
2342 #endif
2343
2344 dev->features |= NETIF_F_NETNS_LOCAL;
2345 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2346 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2347 netif_keep_dst(dev);
2348 }
2349
2350 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2351 static int rpl_ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2352 struct nlattr *tb[], struct nlattr *data[],
2353 struct netlink_ext_ack *extack)
2354 #else
2355 static int rpl_ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2356 struct nlattr *tb[], struct nlattr *data[])
2357 #endif
2358 {
2359 struct ip6_tnl *nt = netdev_priv(dev);
2360 struct net *net = dev_net(dev);
2361 struct ip6gre_net *ign;
2362 int err;
2363
2364 ip6gre_netlink_parms(data, &nt->parms);
2365 ign = net_generic(net, ip6gre_net_id);
2366
2367 if (nt->parms.collect_md) {
2368 if (rtnl_dereference(ign->collect_md_tun_erspan))
2369 return -EEXIST;
2370 } else {
2371 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2372 return -EEXIST;
2373 }
2374
2375 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2376 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2377 #else
2378 err = ip6gre_newlink_common(src_net, dev, tb, data);
2379 #endif
2380 if (!err) {
2381 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2382 ip6erspan_tunnel_link_md(ign, nt);
2383 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2384 }
2385 return err;
2386 }
2387 #define ip6erspan_newlink rpl_ip6erspan_newlink
2388
2389 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2390 {
2391 ip6gre_tnl_link_config_common(t);
2392 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2393 }
2394
2395 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2396 const struct __ip6_tnl_parm *p, int set_mtu)
2397 {
2398 ip6gre_tnl_copy_tnl_parm(t, p);
2399 ip6erspan_tnl_link_config(t, set_mtu);
2400 return 0;
2401 }
2402
2403 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2404 static int rpl_ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2405 struct nlattr *data[],
2406 struct netlink_ext_ack *extack)
2407 #else
2408 static int rpl_ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2409 struct nlattr *data[])
2410 #endif
2411 {
2412 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2413 struct __ip6_tnl_parm p;
2414 struct ip6_tnl *t;
2415 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2416 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2417 #else
2418 t = ip6gre_changelink_common(dev, tb, data, &p);
2419 #endif
2420 if (IS_ERR(t))
2421 return PTR_ERR(t);
2422
2423 ip6gre_tunnel_unlink_md(ign, t);
2424 ip6gre_tunnel_unlink(ign, t);
2425 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2426 ip6erspan_tunnel_link_md(ign, t);
2427 ip6gre_tunnel_link(ign, t);
2428 return 0;
2429 }
2430 #define ip6erspan_changelink rpl_ip6erspan_changelink
2431
2432 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2433 .kind = "ip6gre",
2434 .maxtype = RPL_IFLA_GRE_MAX,
2435 .policy = ip6gre_policy,
2436 .priv_size = sizeof(struct ip6_tnl),
2437 .setup = ip6gre_tunnel_setup,
2438 .validate = ip6gre_tunnel_validate,
2439 .newlink = ip6gre_newlink,
2440 .changelink = ip6gre_changelink,
2441 .dellink = ip6gre_dellink,
2442 .get_size = ip6gre_get_size,
2443 .fill_info = ip6gre_fill_info,
2444 #ifdef HAVE_GET_LINK_NET
2445 .get_link_net = ip6_tnl_get_link_net,
2446 #endif
2447 };
2448
2449 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2450 .kind = "ip6gretap",
2451 .maxtype = RPL_IFLA_GRE_MAX,
2452 .policy = ip6gre_policy,
2453 .priv_size = sizeof(struct ip6_tnl),
2454 .setup = ip6gre_tap_setup,
2455 .validate = ip6gre_tap_validate,
2456 .newlink = ip6gre_newlink,
2457 .changelink = ip6gre_changelink,
2458 .dellink = ip6gre_dellink,
2459 .get_size = ip6gre_get_size,
2460 .fill_info = ip6gre_fill_info,
2461 #ifdef HAVE_GET_LINK_NET
2462 .get_link_net = ip6_tnl_get_link_net,
2463 #endif
2464 };
2465
2466 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2467 .kind = "ip6erspan",
2468 .maxtype = RPL_IFLA_GRE_MAX,
2469 .policy = ip6gre_policy,
2470 .priv_size = sizeof(struct ip6_tnl),
2471 .setup = ip6erspan_tap_setup,
2472 .validate = ip6erspan_tap_validate,
2473 .newlink = ip6erspan_newlink,
2474 .changelink = ip6erspan_changelink,
2475 .dellink = ip6gre_dellink,
2476 .get_size = ip6gre_get_size,
2477 .fill_info = ip6gre_fill_info,
2478 #ifdef HAVE_GET_LINK_NET
2479 .get_link_net = ip6_tnl_get_link_net,
2480 #endif
2481 };
2482
2483 struct net_device *ip6erspan_fb_dev_create(struct net *net, const char *name,
2484 u8 name_assign_type)
2485 {
2486 struct nlattr *tb[IFLA_MAX + 1];
2487 struct net_device *dev;
2488 LIST_HEAD(list_kill);
2489 struct ip6_tnl *t;
2490 int err;
2491
2492 memset(&tb, 0, sizeof(tb));
2493
2494 dev = rtnl_create_link(net, (char *)name, name_assign_type,
2495 &ip6erspan_tap_ops, tb);
2496 if (IS_ERR(dev))
2497 return dev;
2498
2499 t = netdev_priv(dev);
2500 t->parms.collect_md = true;
2501
2502 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2503 err = ip6erspan_newlink(net, dev, tb, NULL, NULL);
2504 #else
2505 err = ip6erspan_newlink(net, dev, tb, NULL);
2506 #endif
2507 if (err < 0) {
2508 free_netdev(dev);
2509 return ERR_PTR(err);
2510 }
2511
2512 /* openvswitch users expect packet sizes to be unrestricted,
2513 * so set the largest MTU we can.
2514 */
2515 err = ip6_tnl_change_mtu(dev, 64000);
2516 if (err)
2517 goto out;
2518
2519 return dev;
2520 out:
2521 ip6gre_dellink(dev, &list_kill);
2522 unregister_netdevice_many(&list_kill);
2523 return ERR_PTR(err);
2524 }
2525
2526 static struct vport_ops ovs_erspan6_vport_ops;
2527
2528 static struct vport *erspan6_tnl_create(const struct vport_parms *parms)
2529 {
2530 struct net *net = ovs_dp_get_net(parms->dp);
2531 struct net_device *dev;
2532 struct vport *vport;
2533 int err;
2534
2535 vport = ovs_vport_alloc(0, &ovs_erspan6_vport_ops, parms);
2536 if (IS_ERR(vport))
2537 return vport;
2538
2539 rtnl_lock();
2540 dev = ip6erspan_fb_dev_create(net, parms->name, NET_NAME_USER);
2541 if (IS_ERR(dev)) {
2542 rtnl_unlock();
2543 ovs_vport_free(vport);
2544 return ERR_CAST(dev);
2545 }
2546
2547 err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
2548 if (err < 0) {
2549 rtnl_delete_link(dev);
2550 rtnl_unlock();
2551 ovs_vport_free(vport);
2552 return ERR_PTR(err);
2553 }
2554
2555 rtnl_unlock();
2556 return vport;
2557 }
2558
2559 static struct vport *erspan6_create(const struct vport_parms *parms)
2560 {
2561 struct vport *vport;
2562
2563 vport = erspan6_tnl_create(parms);
2564 if (IS_ERR(vport))
2565 return vport;
2566
2567 return ovs_netdev_link(vport, parms->name);
2568 }
2569
2570 #ifndef OVS_VPORT_TYPE_IP6ERSPAN
2571 /* Just until integration */
2572 #define OVS_VPORT_TYPE_IP6ERSPAN 108
2573 #endif
2574 static struct vport_ops ovs_erspan6_vport_ops = {
2575 .type = OVS_VPORT_TYPE_IP6ERSPAN,
2576 .create = erspan6_create,
2577 .send = __ip6erspan_tunnel_xmit,
2578 #ifndef USE_UPSTREAM_TUNNEL
2579 .fill_metadata_dst = gre_fill_metadata_dst,
2580 #endif
2581 .destroy = ovs_netdev_tunnel_destroy,
2582 };
2583
2584 struct net_device *ip6gre_fb_dev_create(struct net *net, const char *name,
2585 u8 name_assign_type)
2586 {
2587 struct nlattr *tb[IFLA_MAX + 1];
2588 struct net_device *dev;
2589 LIST_HEAD(list_kill);
2590 struct ip6_tnl *t;
2591 int err;
2592
2593 memset(&tb, 0, sizeof(tb));
2594
2595 dev = rtnl_create_link(net, (char *)name, name_assign_type,
2596 &ip6gre_tap_ops, tb);
2597 if (IS_ERR(dev))
2598 return dev;
2599
2600 t = netdev_priv(dev);
2601 t->parms.collect_md = true;
2602
2603 #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
2604 err = ip6gre_newlink(net, dev, tb, NULL, NULL);
2605 #else
2606 err = ip6gre_newlink(net, dev, tb, NULL);
2607 #endif
2608 if (err < 0) {
2609 free_netdev(dev);
2610 return ERR_PTR(err);
2611 }
2612
2613 /* openvswitch users expect packet sizes to be unrestricted,
2614 * so set the largest MTU we can.
2615 */
2616 err = ip6_tnl_change_mtu(dev, 64000);
2617 if (err)
2618 goto out;
2619
2620 return dev;
2621 out:
2622 ip6gre_dellink(dev, &list_kill);
2623 unregister_netdevice_many(&list_kill);
2624 return ERR_PTR(err);
2625 }
2626
2627 static struct vport_ops ovs_ip6gre_vport_ops;
2628
2629 static struct vport *ip6gre_tnl_create(const struct vport_parms *parms)
2630 {
2631 struct net *net = ovs_dp_get_net(parms->dp);
2632 struct net_device *dev;
2633 struct vport *vport;
2634 int err;
2635
2636 vport = ovs_vport_alloc(0, &ovs_ip6gre_vport_ops, parms);
2637 if (IS_ERR(vport))
2638 return vport;
2639
2640 rtnl_lock();
2641 dev = ip6gre_fb_dev_create(net, parms->name, NET_NAME_USER);
2642 if (IS_ERR(dev)) {
2643 rtnl_unlock();
2644 ovs_vport_free(vport);
2645 return ERR_CAST(dev);
2646 }
2647
2648 err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
2649 if (err < 0) {
2650 rtnl_delete_link(dev);
2651 rtnl_unlock();
2652 ovs_vport_free(vport);
2653 return ERR_PTR(err);
2654 }
2655
2656 rtnl_unlock();
2657 return vport;
2658 }
2659
2660 static struct vport *ip6gre_create(const struct vport_parms *parms)
2661 {
2662 struct vport *vport;
2663
2664 vport = ip6gre_tnl_create(parms);
2665 if (IS_ERR(vport))
2666 return vport;
2667
2668 return ovs_netdev_link(vport, parms->name);
2669 }
2670
2671 static struct vport_ops ovs_ip6gre_vport_ops = {
2672 .type = OVS_VPORT_TYPE_IP6GRE,
2673 .create = ip6gre_create,
2674 .send = __ip6gre_tunnel_xmit,
2675 #ifndef USE_UPSTREAM_TUNNEL
2676 .fill_metadata_dst = gre_fill_metadata_dst,
2677 #endif
2678 .destroy = ovs_netdev_tunnel_destroy,
2679 };
2680
2681
2682 /*
2683 * And now the modules code and kernel interface.
2684 */
2685
2686 int rpl_ip6gre_init(void)
2687 {
2688 int err;
2689
2690 err = register_pernet_device(&ip6gre_net_ops);
2691 if (err < 0) {
2692 if (err == -EEXIST)
2693 goto ip6_gre_loaded;
2694 else
2695 goto out;
2696 }
2697
2698 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2699 if (err < 0) {
2700 pr_info("%s: can't add protocol\n", __func__);
2701 unregister_pernet_device(&ip6gre_net_ops);
2702 /*
2703 * inet6_add_protocol will return a -1 if it fails
2704 * to grab the pointer but the vport initialization
2705 * expects a return value of -EEXIST. Set err to
2706 * -EEXIST here to ensure proper handling.
2707 */
2708 err = -EEXIST;
2709 goto ip6_gre_loaded;
2710 }
2711
2712 pr_info("GRE over IPv6 tunneling driver\n");
2713 ovs_vport_ops_register(&ovs_ip6gre_vport_ops);
2714 ovs_vport_ops_register(&ovs_erspan6_vport_ops);
2715 return err;
2716
2717 ip6_gre_loaded:
2718 /* Since IPv6 GRE only allows single receiver to be registerd,
2719 * we skip here so only transmit works, see:
2720 *
2721 * commit f9242b6b28d61295f2bf7e8adfb1060b382e5381
2722 * Author: David S. Miller <davem@davemloft.net>
2723 * Date: Tue Jun 19 18:56:21 2012 -0700
2724 *
2725 * inet: Sanitize inet{,6} protocol demux.
2726 *
2727 * OVS GRE receive part is disabled.
2728 */
2729 pr_info("GRE TX only over IPv6 tunneling driver\n");
2730 ip6_gre_loaded = true;
2731 ovs_vport_ops_register(&ovs_ip6gre_vport_ops);
2732 ovs_vport_ops_register(&ovs_erspan6_vport_ops);
2733 out:
2734 return err;
2735 }
2736
2737 void rpl_ip6gre_fini(void)
2738 {
2739 ovs_vport_ops_unregister(&ovs_erspan6_vport_ops);
2740 ovs_vport_ops_unregister(&ovs_ip6gre_vport_ops);
2741 if (!ip6_gre_loaded) {
2742 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2743 unregister_pernet_device(&ip6gre_net_ops);
2744 }
2745 }
2746 #endif /* USE_UPSTREAM_TUNNEL */
openvswitch packages for PVE