projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
powerpc/83xx: gianfar_ptp: select 1588 clock source through dts file
[linux-2.6-block.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 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#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
27#include <linux/mroute.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>
c5441932 41#include <net/ip_tunnels.h>
c12b395a 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
59
eccc1bb8 60static bool log_ecn_error = true;
61module_param(log_ecn_error, bool, 0644);
62MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
c12b395a 64#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
65#define IPV6_TCLASS_SHIFT 20
66
67#define HASH_SIZE_SHIFT 5
68#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
69
70static int ip6gre_net_id __read_mostly;
71struct ip6gre_net {
72 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
73
74 struct net_device *fb_tunnel_dev;
75};
76
77static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
78static int ip6gre_tunnel_init(struct net_device *dev);
79static void ip6gre_tunnel_setup(struct net_device *dev);
80static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
81static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82
83/* Tunnel hash table */
84
85/*
86 4 hash tables:
87
88 3: (remote,local)
89 2: (remote,*)
90 1: (*,local)
91 0: (*,*)
92
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
96
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
99 */
100
101#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
102static u32 HASH_ADDR(const struct in6_addr *addr)
103{
104 u32 hash = ipv6_addr_hash(addr);
105
106 return hash_32(hash, HASH_SIZE_SHIFT);
107}
108
109#define tunnels_r_l tunnels[3]
110#define tunnels_r tunnels[2]
111#define tunnels_l tunnels[1]
112#define tunnels_wc tunnels[0]
c12b395a 113
c12b395a 114/* Given src, dst and key, find appropriate for input tunnel. */
115
116static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
117 const struct in6_addr *remote, const struct in6_addr *local,
118 __be32 key, __be16 gre_proto)
119{
120 struct net *net = dev_net(dev);
121 int link = dev->ifindex;
122 unsigned int h0 = HASH_ADDR(remote);
123 unsigned int h1 = HASH_KEY(key);
124 struct ip6_tnl *t, *cand = NULL;
125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
126 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
127 ARPHRD_ETHER : ARPHRD_IP6GRE;
128 int score, cand_score = 4;
129
e086cadc 130 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 131 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
132 !ipv6_addr_equal(remote, &t->parms.raddr) ||
133 key != t->parms.i_key ||
134 !(t->dev->flags & IFF_UP))
135 continue;
136
137 if (t->dev->type != ARPHRD_IP6GRE &&
138 t->dev->type != dev_type)
139 continue;
140
141 score = 0;
142 if (t->parms.link != link)
143 score |= 1;
144 if (t->dev->type != dev_type)
145 score |= 2;
146 if (score == 0)
147 return t;
148
149 if (score < cand_score) {
150 cand = t;
151 cand_score = score;
152 }
153 }
154
e086cadc 155 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 156 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
157 key != t->parms.i_key ||
158 !(t->dev->flags & IFF_UP))
159 continue;
160
161 if (t->dev->type != ARPHRD_IP6GRE &&
162 t->dev->type != dev_type)
163 continue;
164
165 score = 0;
166 if (t->parms.link != link)
167 score |= 1;
168 if (t->dev->type != dev_type)
169 score |= 2;
170 if (score == 0)
171 return t;
172
173 if (score < cand_score) {
174 cand = t;
175 cand_score = score;
176 }
177 }
178
e086cadc 179 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 180 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
181 (!ipv6_addr_equal(local, &t->parms.raddr) ||
182 !ipv6_addr_is_multicast(local))) ||
183 key != t->parms.i_key ||
184 !(t->dev->flags & IFF_UP))
185 continue;
186
187 if (t->dev->type != ARPHRD_IP6GRE &&
188 t->dev->type != dev_type)
189 continue;
190
191 score = 0;
192 if (t->parms.link != link)
193 score |= 1;
194 if (t->dev->type != dev_type)
195 score |= 2;
196 if (score == 0)
197 return t;
198
199 if (score < cand_score) {
200 cand = t;
201 cand_score = score;
202 }
203 }
204
e086cadc 205 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 206 if (t->parms.i_key != key ||
207 !(t->dev->flags & IFF_UP))
208 continue;
209
210 if (t->dev->type != ARPHRD_IP6GRE &&
211 t->dev->type != dev_type)
212 continue;
213
214 score = 0;
215 if (t->parms.link != link)
216 score |= 1;
217 if (t->dev->type != dev_type)
218 score |= 2;
219 if (score == 0)
220 return t;
221
222 if (score < cand_score) {
223 cand = t;
224 cand_score = score;
225 }
226 }
227
228 if (cand != NULL)
229 return cand;
230
231 dev = ign->fb_tunnel_dev;
232 if (dev->flags & IFF_UP)
233 return netdev_priv(dev);
234
235 return NULL;
236}
237
238static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
239 const struct __ip6_tnl_parm *p)
240{
241 const struct in6_addr *remote = &p->raddr;
242 const struct in6_addr *local = &p->laddr;
243 unsigned int h = HASH_KEY(p->i_key);
244 int prio = 0;
245
246 if (!ipv6_addr_any(local))
247 prio |= 1;
248 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
249 prio |= 2;
250 h ^= HASH_ADDR(remote);
251 }
252
253 return &ign->tunnels[prio][h];
254}
255
256static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
257 const struct ip6_tnl *t)
258{
259 return __ip6gre_bucket(ign, &t->parms);
260}
261
262static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
263{
264 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
265
266 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
267 rcu_assign_pointer(*tp, t);
268}
269
270static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
271{
272 struct ip6_tnl __rcu **tp;
273 struct ip6_tnl *iter;
274
275 for (tp = ip6gre_bucket(ign, t);
276 (iter = rtnl_dereference(*tp)) != NULL;
277 tp = &iter->next) {
278 if (t == iter) {
279 rcu_assign_pointer(*tp, t->next);
280 break;
281 }
282 }
283}
284
285static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
286 const struct __ip6_tnl_parm *parms,
287 int type)
288{
289 const struct in6_addr *remote = &parms->raddr;
290 const struct in6_addr *local = &parms->laddr;
291 __be32 key = parms->i_key;
292 int link = parms->link;
293 struct ip6_tnl *t;
294 struct ip6_tnl __rcu **tp;
295 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
296
297 for (tp = __ip6gre_bucket(ign, parms);
298 (t = rtnl_dereference(*tp)) != NULL;
299 tp = &t->next)
300 if (ipv6_addr_equal(local, &t->parms.laddr) &&
301 ipv6_addr_equal(remote, &t->parms.raddr) &&
302 key == t->parms.i_key &&
303 link == t->parms.link &&
304 type == t->dev->type)
305 break;
306
307 return t;
308}
309
310static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
311 const struct __ip6_tnl_parm *parms, int create)
312{
313 struct ip6_tnl *t, *nt;
314 struct net_device *dev;
315 char name[IFNAMSIZ];
316 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
317
318 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
327 dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
328 if (!dev)
329 return NULL;
330
331 dev_net_set(dev, net);
332
333 nt = netdev_priv(dev);
334 nt->parms = *parms;
335 dev->rtnl_link_ops = &ip6gre_link_ops;
336
337 nt->dev = dev;
0bd87628 338 nt->net = dev_net(dev);
c12b395a 339 ip6gre_tnl_link_config(nt, 1);
340
341 if (register_netdevice(dev) < 0)
342 goto failed_free;
343
344 /* Can use a lockless transmit, unless we generate output sequences */
345 if (!(nt->parms.o_flags & GRE_SEQ))
346 dev->features |= NETIF_F_LLTX;
347
348 dev_hold(dev);
349 ip6gre_tunnel_link(ign, nt);
350 return nt;
351
352failed_free:
353 free_netdev(dev);
354 return NULL;
355}
356
357static void ip6gre_tunnel_uninit(struct net_device *dev)
358{
359 struct net *net = dev_net(dev);
360 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
361
362 ip6gre_tunnel_unlink(ign, netdev_priv(dev));
363 dev_put(dev);
364}
365
366
367static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
368 u8 type, u8 code, int offset, __be32 info)
369{
370 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 371 __be16 *p = (__be16 *)(skb->data + offset);
372 int grehlen = offset + 4;
c12b395a 373 struct ip6_tnl *t;
374 __be16 flags;
375
376 flags = p[0];
377 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
378 if (flags&(GRE_VERSION|GRE_ROUTING))
379 return;
380 if (flags&GRE_KEY) {
381 grehlen += 4;
382 if (flags&GRE_CSUM)
383 grehlen += 4;
384 }
385 }
386
387 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 388 if (!pskb_may_pull(skb, grehlen))
c12b395a 389 return;
b87fb39e
ED		 390 ipv6h = (const struct ipv6hdr *)skb->data;
391 p = (__be16 *)(skb->data + offset);
c12b395a 392
c12b395a 393 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
394 flags & GRE_KEY ?
395 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
396 p[1]);
397 if (t == NULL)
0c5794a6 398 return;
c12b395a 399
400 switch (type) {
401 __u32 teli;
402 struct ipv6_tlv_tnl_enc_lim *tel;
403 __u32 mtu;
404 case ICMPV6_DEST_UNREACH:
405 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
406 t->parms.name);
407 break;
408 case ICMPV6_TIME_EXCEED:
409 if (code == ICMPV6_EXC_HOPLIMIT) {
410 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
411 t->parms.name);
412 }
413 break;
414 case ICMPV6_PARAMPROB:
415 teli = 0;
416 if (code == ICMPV6_HDR_FIELD)
417 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
418
419 if (teli && teli == info - 2) {
420 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
421 if (tel->encap_limit == 0) {
422 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
423 t->parms.name);
424 }
425 } else {
426 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
427 t->parms.name);
428 }
429 break;
430 case ICMPV6_PKT_TOOBIG:
431 mtu = info - offset;
432 if (mtu < IPV6_MIN_MTU)
433 mtu = IPV6_MIN_MTU;
434 t->dev->mtu = mtu;
435 break;
436 }
437
438 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
439 t->err_count++;
440 else
441 t->err_count = 1;
442 t->err_time = jiffies;
c12b395a 443}
444
c12b395a 445static int ip6gre_rcv(struct sk_buff *skb)
446{
447 const struct ipv6hdr *ipv6h;
448 u8 *h;
449 __be16 flags;
450 __sum16 csum = 0;
451 __be32 key = 0;
452 u32 seqno = 0;
453 struct ip6_tnl *tunnel;
454 int offset = 4;
455 __be16 gre_proto;
eccc1bb8 456 int err;
c12b395a 457
458 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
0c5794a6 459 goto drop;
c12b395a 460
461 ipv6h = ipv6_hdr(skb);
462 h = skb->data;
463 flags = *(__be16 *)h;
464
465 if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
466 /* - Version must be 0.
467 - We do not support routing headers.
468 */
469 if (flags&(GRE_VERSION|GRE_ROUTING))
0c5794a6 470 goto drop;
c12b395a 471
472 if (flags&GRE_CSUM) {
473 switch (skb->ip_summed) {
474 case CHECKSUM_COMPLETE:
475 csum = csum_fold(skb->csum);
476 if (!csum)
477 break;
478 /* fall through */
479 case CHECKSUM_NONE:
480 skb->csum = 0;
481 csum = __skb_checksum_complete(skb);
482 skb->ip_summed = CHECKSUM_COMPLETE;
483 }
484 offset += 4;
485 }
486 if (flags&GRE_KEY) {
487 key = *(__be32 *)(h + offset);
488 offset += 4;
489 }
490 if (flags&GRE_SEQ) {
491 seqno = ntohl(*(__be32 *)(h + offset));
492 offset += 4;
493 }
494 }
495
496 gre_proto = *(__be16 *)(h + 2);
497
c12b395a 498 tunnel = ip6gre_tunnel_lookup(skb->dev,
499 &ipv6h->saddr, &ipv6h->daddr, key,
500 gre_proto);
501 if (tunnel) {
502 struct pcpu_tstats *tstats;
503
504 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
505 goto drop;
506
507 if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
508 tunnel->dev->stats.rx_dropped++;
509 goto drop;
510 }
511
c12b395a 512 skb->protocol = gre_proto;
513 /* WCCP version 1 and 2 protocol decoding.
514 * - Change protocol to IP
515 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
516 */
517 if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
518 skb->protocol = htons(ETH_P_IP);
519 if ((*(h + offset) & 0xF0) != 0x40)
520 offset += 4;
521 }
522
523 skb->mac_header = skb->network_header;
524 __pskb_pull(skb, offset);
525 skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
c12b395a 526
527 if (((flags&GRE_CSUM) && csum) ||
528 (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
529 tunnel->dev->stats.rx_crc_errors++;
530 tunnel->dev->stats.rx_errors++;
531 goto drop;
532 }
533 if (tunnel->parms.i_flags&GRE_SEQ) {
534 if (!(flags&GRE_SEQ) ||
535 (tunnel->i_seqno &&
536 (s32)(seqno - tunnel->i_seqno) < 0)) {
537 tunnel->dev->stats.rx_fifo_errors++;
538 tunnel->dev->stats.rx_errors++;
539 goto drop;
540 }
541 tunnel->i_seqno = seqno + 1;
542 }
543
544 /* Warning: All skb pointers will be invalidated! */
545 if (tunnel->dev->type == ARPHRD_ETHER) {
546 if (!pskb_may_pull(skb, ETH_HLEN)) {
547 tunnel->dev->stats.rx_length_errors++;
548 tunnel->dev->stats.rx_errors++;
549 goto drop;
550 }
551
552 ipv6h = ipv6_hdr(skb);
553 skb->protocol = eth_type_trans(skb, tunnel->dev);
554 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
555 }
556
ea23192e 557 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
eccc1bb8 558
559 skb_reset_network_header(skb);
560
561 err = IP6_ECN_decapsulate(ipv6h, skb);
562 if (unlikely(err)) {
563 if (log_ecn_error)
564 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
565 &ipv6h->saddr,
566 ipv6_get_dsfield(ipv6h));
567 if (err > 1) {
568 ++tunnel->dev->stats.rx_frame_errors;
569 ++tunnel->dev->stats.rx_errors;
570 goto drop;
571 }
572 }
573
c12b395a 574 tstats = this_cpu_ptr(tunnel->dev->tstats);
575 u64_stats_update_begin(&tstats->syncp);
576 tstats->rx_packets++;
577 tstats->rx_bytes += skb->len;
578 u64_stats_update_end(&tstats->syncp);
579
c12b395a 580 netif_rx(skb);
581
c12b395a 582 return 0;
583 }
584 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
585
586drop:
c12b395a 587 kfree_skb(skb);
588 return 0;
589}
590
591struct ipv6_tel_txoption {
592 struct ipv6_txoptions ops;
593 __u8 dst_opt[8];
594};
595
596static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
597{
598 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
599
600 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
601 opt->dst_opt[3] = 1;
602 opt->dst_opt[4] = encap_limit;
603 opt->dst_opt[5] = IPV6_TLV_PADN;
604 opt->dst_opt[6] = 1;
605
606 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
607 opt->ops.opt_nflen = 8;
608}
609
610static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
611 struct net_device *dev,
612 __u8 dsfield,
613 struct flowi6 *fl6,
614 int encap_limit,
615 __u32 *pmtu)
616{
617 struct net *net = dev_net(dev);
618 struct ip6_tnl *tunnel = netdev_priv(dev);
619 struct net_device *tdev; /* Device to other host */
620 struct ipv6hdr *ipv6h; /* Our new IP header */
621 unsigned int max_headroom; /* The extra header space needed */
622 int gre_hlen;
623 struct ipv6_tel_txoption opt;
624 int mtu;
625 struct dst_entry *dst = NULL, *ndst = NULL;
626 struct net_device_stats *stats = &tunnel->dev->stats;
627 int err = -1;
628 u8 proto;
c12b395a 629 struct sk_buff *new_skb;
630
631 if (dev->type == ARPHRD_ETHER)
632 IPCB(skb)->flags = 0;
633
634 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
635 gre_hlen = 0;
636 ipv6h = (struct ipv6hdr *)skb->data;
637 fl6->daddr = ipv6h->daddr;
638 } else {
639 gre_hlen = tunnel->hlen;
640 fl6->daddr = tunnel->parms.raddr;
641 }
642
643 if (!fl6->flowi6_mark)
644 dst = ip6_tnl_dst_check(tunnel);
645
646 if (!dst) {
647 ndst = ip6_route_output(net, NULL, fl6);
648
649 if (ndst->error)
650 goto tx_err_link_failure;
651 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
652 if (IS_ERR(ndst)) {
653 err = PTR_ERR(ndst);
654 ndst = NULL;
655 goto tx_err_link_failure;
656 }
657 dst = ndst;
658 }
659
660 tdev = dst->dev;
661
662 if (tdev == dev) {
663 stats->collisions++;
664 net_warn_ratelimited("%s: Local routing loop detected!\n",
665 tunnel->parms.name);
666 goto tx_err_dst_release;
667 }
668
669 mtu = dst_mtu(dst) - sizeof(*ipv6h);
670 if (encap_limit >= 0) {
671 max_headroom += 8;
672 mtu -= 8;
673 }
674 if (mtu < IPV6_MIN_MTU)
675 mtu = IPV6_MIN_MTU;
676 if (skb_dst(skb))
677 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
678 if (skb->len > mtu) {
679 *pmtu = mtu;
680 err = -EMSGSIZE;
681 goto tx_err_dst_release;
682 }
683
684 if (tunnel->err_count > 0) {
685 if (time_before(jiffies,
686 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
687 tunnel->err_count--;
688
689 dst_link_failure(skb);
690 } else
691 tunnel->err_count = 0;
692 }
693
963a88b3
ND		 694 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
695
c12b395a 696 max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
697
698 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
699 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
700 new_skb = skb_realloc_headroom(skb, max_headroom);
701 if (max_headroom > dev->needed_headroom)
702 dev->needed_headroom = max_headroom;
703 if (!new_skb)
704 goto tx_err_dst_release;
705
706 if (skb->sk)
707 skb_set_owner_w(new_skb, skb->sk);
708 consume_skb(skb);
709 skb = new_skb;
710 }
711
c12b395a 712 if (fl6->flowi6_mark) {
713 skb_dst_set(skb, dst);
714 ndst = NULL;
715 } else {
716 skb_dst_set_noref(skb, dst);
717 }
718
c12b395a 719 proto = NEXTHDR_GRE;
720 if (encap_limit >= 0) {
721 init_tel_txopt(&opt, encap_limit);
722 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
723 }
724
3d483058
HFS		 725 if (likely(!skb->encapsulation)) {
726 skb_reset_inner_headers(skb);
727 skb->encapsulation = 1;
728 }
729
c12b395a 730 skb_push(skb, gre_hlen);
731 skb_reset_network_header(skb);
ae782bb1 732 skb_set_transport_header(skb, sizeof(*ipv6h));
c12b395a 733
734 /*
735 * Push down and install the IP header.
736 */
737 ipv6h = ipv6_hdr(skb);
3e4e4c1f 738 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
c12b395a 739 ipv6h->hop_limit = tunnel->parms.hop_limit;
740 ipv6h->nexthdr = proto;
741 ipv6h->saddr = fl6->saddr;
742 ipv6h->daddr = fl6->daddr;
743
744 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
745 ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
746 htons(ETH_P_TEB) : skb->protocol;
747
748 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
749 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
750
751 if (tunnel->parms.o_flags&GRE_SEQ) {
752 ++tunnel->o_seqno;
753 *ptr = htonl(tunnel->o_seqno);
754 ptr--;
755 }
756 if (tunnel->parms.o_flags&GRE_KEY) {
757 *ptr = tunnel->parms.o_key;
758 ptr--;
759 }
760 if (tunnel->parms.o_flags&GRE_CSUM) {
761 *ptr = 0;
762 *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
763 skb->len - sizeof(struct ipv6hdr));
764 }
765 }
766
e8f72ea4 767 ip6tunnel_xmit(skb, dev);
c12b395a 768 if (ndst)
769 ip6_tnl_dst_store(tunnel, ndst);
c12b395a 770 return 0;
771tx_err_link_failure:
772 stats->tx_carrier_errors++;
773 dst_link_failure(skb);
774tx_err_dst_release:
775 dst_release(ndst);
776 return err;
777}
778
779static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
780{
781 struct ip6_tnl *t = netdev_priv(dev);
782 const struct iphdr *iph = ip_hdr(skb);
783 int encap_limit = -1;
784 struct flowi6 fl6;
785 __u8 dsfield;
786 __u32 mtu;
787 int err;
788
789 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
790 encap_limit = t->parms.encap_limit;
791
792 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
793 fl6.flowi6_proto = IPPROTO_IPIP;
794
795 dsfield = ipv4_get_dsfield(iph);
796
797 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
798 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
799 & IPV6_TCLASS_MASK;
800 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
801 fl6.flowi6_mark = skb->mark;
802
803 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
804 if (err != 0) {
805 /* XXX: send ICMP error even if DF is not set. */
806 if (err == -EMSGSIZE)
807 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
808 htonl(mtu));
809 return -1;
810 }
811
812 return 0;
813}
814
815static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
816{
817 struct ip6_tnl *t = netdev_priv(dev);
818 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
819 int encap_limit = -1;
820 __u16 offset;
821 struct flowi6 fl6;
822 __u8 dsfield;
823 __u32 mtu;
824 int err;
825
826 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
827 return -1;
828
829 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
830 if (offset > 0) {
831 struct ipv6_tlv_tnl_enc_lim *tel;
832 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
833 if (tel->encap_limit == 0) {
834 icmpv6_send(skb, ICMPV6_PARAMPROB,
835 ICMPV6_HDR_FIELD, offset + 2);
836 return -1;
837 }
838 encap_limit = tel->encap_limit - 1;
839 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
840 encap_limit = t->parms.encap_limit;
841
842 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
843 fl6.flowi6_proto = IPPROTO_IPV6;
844
845 dsfield = ipv6_get_dsfield(ipv6h);
846 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
847 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
848 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
849 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
850 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
851 fl6.flowi6_mark = skb->mark;
852
853 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
854 if (err != 0) {
855 if (err == -EMSGSIZE)
856 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
857 return -1;
858 }
859
860 return 0;
861}
862
863/**
864 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
865 * @t: the outgoing tunnel device
866 * @hdr: IPv6 header from the incoming packet
867 *
868 * Description:
869 * Avoid trivial tunneling loop by checking that tunnel exit-point
870 * doesn't match source of incoming packet.
871 *
872 * Return:
873 * 1 if conflict,
874 * 0 else
875 **/
876
877static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
878 const struct ipv6hdr *hdr)
879{
880 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
881}
882
883static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
884{
885 struct ip6_tnl *t = netdev_priv(dev);
886 int encap_limit = -1;
887 struct flowi6 fl6;
888 __u32 mtu;
889 int err;
890
891 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
892 encap_limit = t->parms.encap_limit;
893
894 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
895 fl6.flowi6_proto = skb->protocol;
896
897 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
898
899 return err;
900}
901
902static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
903 struct net_device *dev)
904{
905 struct ip6_tnl *t = netdev_priv(dev);
906 struct net_device_stats *stats = &t->dev->stats;
907 int ret;
908
909 if (!ip6_tnl_xmit_ctl(t))
41ab3e31 910 goto tx_err;
c12b395a 911
912 switch (skb->protocol) {
913 case htons(ETH_P_IP):
914 ret = ip6gre_xmit_ipv4(skb, dev);
915 break;
916 case htons(ETH_P_IPV6):
917 ret = ip6gre_xmit_ipv6(skb, dev);
918 break;
919 default:
920 ret = ip6gre_xmit_other(skb, dev);
921 break;
922 }
923
924 if (ret < 0)
925 goto tx_err;
926
927 return NETDEV_TX_OK;
928
929tx_err:
930 stats->tx_errors++;
931 stats->tx_dropped++;
932 kfree_skb(skb);
933 return NETDEV_TX_OK;
934}
935
936static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
937{
938 struct net_device *dev = t->dev;
939 struct __ip6_tnl_parm *p = &t->parms;
940 struct flowi6 *fl6 = &t->fl.u.ip6;
941 int addend = sizeof(struct ipv6hdr) + 4;
942
943 if (dev->type != ARPHRD_ETHER) {
944 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
945 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
946 }
947
948 /* Set up flowi template */
949 fl6->saddr = p->laddr;
950 fl6->daddr = p->raddr;
951 fl6->flowi6_oif = p->link;
952 fl6->flowlabel = 0;
953
954 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
955 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
956 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
957 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
958
959 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
960 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
961
962 if (p->flags&IP6_TNL_F_CAP_XMIT &&
963 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
964 dev->flags |= IFF_POINTOPOINT;
965 else
966 dev->flags &= ~IFF_POINTOPOINT;
967
968 dev->iflink = p->link;
969
970 /* Precalculate GRE options length */
971 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
972 if (t->parms.o_flags&GRE_CSUM)
973 addend += 4;
974 if (t->parms.o_flags&GRE_KEY)
975 addend += 4;
976 if (t->parms.o_flags&GRE_SEQ)
977 addend += 4;
978 }
979
980 if (p->flags & IP6_TNL_F_CAP_XMIT) {
981 int strict = (ipv6_addr_type(&p->raddr) &
982 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
983
984 struct rt6_info *rt = rt6_lookup(dev_net(dev),
985 &p->raddr, &p->laddr,
986 p->link, strict);
987
988 if (rt == NULL)
989 return;
990
991 if (rt->dst.dev) {
992 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
993
994 if (set_mtu) {
995 dev->mtu = rt->dst.dev->mtu - addend;
996 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
997 dev->mtu -= 8;
998
999 if (dev->mtu < IPV6_MIN_MTU)
1000 dev->mtu = IPV6_MIN_MTU;
1001 }
1002 }
94e187c0 1003 ip6_rt_put(rt);
c12b395a 1004 }
1005
1006 t->hlen = addend;
1007}
1008
1009static int ip6gre_tnl_change(struct ip6_tnl *t,
1010 const struct __ip6_tnl_parm *p, int set_mtu)
1011{
1012 t->parms.laddr = p->laddr;
1013 t->parms.raddr = p->raddr;
1014 t->parms.flags = p->flags;
1015 t->parms.hop_limit = p->hop_limit;
1016 t->parms.encap_limit = p->encap_limit;
1017 t->parms.flowinfo = p->flowinfo;
1018 t->parms.link = p->link;
1019 t->parms.proto = p->proto;
1020 t->parms.i_key = p->i_key;
1021 t->parms.o_key = p->o_key;
1022 t->parms.i_flags = p->i_flags;
1023 t->parms.o_flags = p->o_flags;
1024 ip6_tnl_dst_reset(t);
1025 ip6gre_tnl_link_config(t, set_mtu);
1026 return 0;
1027}
1028
1029static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1030 const struct ip6_tnl_parm2 *u)
1031{
1032 p->laddr = u->laddr;
1033 p->raddr = u->raddr;
1034 p->flags = u->flags;
1035 p->hop_limit = u->hop_limit;
1036 p->encap_limit = u->encap_limit;
1037 p->flowinfo = u->flowinfo;
1038 p->link = u->link;
1039 p->i_key = u->i_key;
1040 p->o_key = u->o_key;
1041 p->i_flags = u->i_flags;
1042 p->o_flags = u->o_flags;
1043 memcpy(p->name, u->name, sizeof(u->name));
1044}
1045
1046static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1047 const struct __ip6_tnl_parm *p)
1048{
1049 u->proto = IPPROTO_GRE;
1050 u->laddr = p->laddr;
1051 u->raddr = p->raddr;
1052 u->flags = p->flags;
1053 u->hop_limit = p->hop_limit;
1054 u->encap_limit = p->encap_limit;
1055 u->flowinfo = p->flowinfo;
1056 u->link = p->link;
1057 u->i_key = p->i_key;
1058 u->o_key = p->o_key;
1059 u->i_flags = p->i_flags;
1060 u->o_flags = p->o_flags;
1061 memcpy(u->name, p->name, sizeof(u->name));
1062}
1063
1064static int ip6gre_tunnel_ioctl(struct net_device *dev,
1065 struct ifreq *ifr, int cmd)
1066{
1067 int err = 0;
1068 struct ip6_tnl_parm2 p;
1069 struct __ip6_tnl_parm p1;
1070 struct ip6_tnl *t;
1071 struct net *net = dev_net(dev);
1072 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1073
1074 switch (cmd) {
1075 case SIOCGETTUNNEL:
1076 t = NULL;
1077 if (dev == ign->fb_tunnel_dev) {
1078 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1079 err = -EFAULT;
1080 break;
1081 }
1082 ip6gre_tnl_parm_from_user(&p1, &p);
1083 t = ip6gre_tunnel_locate(net, &p1, 0);
1084 }
1085 if (t == NULL)
1086 t = netdev_priv(dev);
5dbd5068 1087 memset(&p, 0, sizeof(p));
c12b395a 1088 ip6gre_tnl_parm_to_user(&p, &t->parms);
1089 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1090 err = -EFAULT;
1091 break;
1092
1093 case SIOCADDTUNNEL:
1094 case SIOCCHGTUNNEL:
1095 err = -EPERM;
af31f412 1096 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1097 goto done;
1098
1099 err = -EFAULT;
1100 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1101 goto done;
1102
1103 err = -EINVAL;
1104 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1105 goto done;
1106
1107 if (!(p.i_flags&GRE_KEY))
1108 p.i_key = 0;
1109 if (!(p.o_flags&GRE_KEY))
1110 p.o_key = 0;
1111
1112 ip6gre_tnl_parm_from_user(&p1, &p);
1113 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1114
1115 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1116 if (t != NULL) {
1117 if (t->dev != dev) {
1118 err = -EEXIST;
1119 break;
1120 }
1121 } else {
1122 t = netdev_priv(dev);
1123
1124 ip6gre_tunnel_unlink(ign, t);
1125 synchronize_net();
1126 ip6gre_tnl_change(t, &p1, 1);
1127 ip6gre_tunnel_link(ign, t);
1128 netdev_state_change(dev);
1129 }
1130 }
1131
1132 if (t) {
1133 err = 0;
1134
5dbd5068 1135 memset(&p, 0, sizeof(p));
c12b395a 1136 ip6gre_tnl_parm_to_user(&p, &t->parms);
1137 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1138 err = -EFAULT;
1139 } else
1140 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1141 break;
1142
1143 case SIOCDELTUNNEL:
1144 err = -EPERM;
af31f412 1145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1146 goto done;
1147
1148 if (dev == ign->fb_tunnel_dev) {
1149 err = -EFAULT;
1150 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1151 goto done;
1152 err = -ENOENT;
1153 ip6gre_tnl_parm_from_user(&p1, &p);
1154 t = ip6gre_tunnel_locate(net, &p1, 0);
1155 if (t == NULL)
1156 goto done;
1157 err = -EPERM;
1158 if (t == netdev_priv(ign->fb_tunnel_dev))
1159 goto done;
1160 dev = t->dev;
1161 }
1162 unregister_netdevice(dev);
1163 err = 0;
1164 break;
1165
1166 default:
1167 err = -EINVAL;
1168 }
1169
1170done:
1171 return err;
1172}
1173
1174static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1175{
1176 struct ip6_tnl *tunnel = netdev_priv(dev);
1177 if (new_mtu < 68 ||
1178 new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
1179 return -EINVAL;
1180 dev->mtu = new_mtu;
1181 return 0;
1182}
1183
1184static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1185 unsigned short type,
1186 const void *daddr, const void *saddr, unsigned int len)
1187{
1188 struct ip6_tnl *t = netdev_priv(dev);
1189 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1190 __be16 *p = (__be16 *)(ipv6h+1);
1191
3e4e4c1f 1192 ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
c12b395a 1193 ipv6h->hop_limit = t->parms.hop_limit;
1194 ipv6h->nexthdr = NEXTHDR_GRE;
1195 ipv6h->saddr = t->parms.laddr;
1196 ipv6h->daddr = t->parms.raddr;
1197
1198 p[0] = t->parms.o_flags;
1199 p[1] = htons(type);
1200
1201 /*
1202 * Set the source hardware address.
1203 */
1204
1205 if (saddr)
1206 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1207 if (daddr)
1208 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1209 if (!ipv6_addr_any(&ipv6h->daddr))
1210 return t->hlen;
1211
1212 return -t->hlen;
1213}
1214
c12b395a 1215static const struct header_ops ip6gre_header_ops = {
1216 .create = ip6gre_header,
c12b395a 1217};
1218
1219static const struct net_device_ops ip6gre_netdev_ops = {
1220 .ndo_init = ip6gre_tunnel_init,
1221 .ndo_uninit = ip6gre_tunnel_uninit,
1222 .ndo_start_xmit = ip6gre_tunnel_xmit,
1223 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1224 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1225 .ndo_get_stats64 = ip_tunnel_get_stats64,
c12b395a 1226};
1227
1228static void ip6gre_dev_free(struct net_device *dev)
1229{
1230 free_percpu(dev->tstats);
1231 free_netdev(dev);
1232}
1233
1234static void ip6gre_tunnel_setup(struct net_device *dev)
1235{
1236 struct ip6_tnl *t;
1237
1238 dev->netdev_ops = &ip6gre_netdev_ops;
1239 dev->destructor = ip6gre_dev_free;
1240
1241 dev->type = ARPHRD_IP6GRE;
1242 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1243 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1244 t = netdev_priv(dev);
1245 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1246 dev->mtu -= 8;
1247 dev->flags |= IFF_NOARP;
1248 dev->iflink = 0;
1249 dev->addr_len = sizeof(struct in6_addr);
1250 dev->features |= NETIF_F_NETNS_LOCAL;
1251 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1252}
1253
1254static int ip6gre_tunnel_init(struct net_device *dev)
1255{
1256 struct ip6_tnl *tunnel;
1257
1258 tunnel = netdev_priv(dev);
1259
1260 tunnel->dev = dev;
0bd87628 1261 tunnel->net = dev_net(dev);
c12b395a 1262 strcpy(tunnel->parms.name, dev->name);
1263
1264 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1265 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1266
1267 if (ipv6_addr_any(&tunnel->parms.raddr))
1268 dev->header_ops = &ip6gre_header_ops;
1269
1270 dev->tstats = alloc_percpu(struct pcpu_tstats);
1271 if (!dev->tstats)
1272 return -ENOMEM;
1273
1274 return 0;
1275}
1276
1277static void ip6gre_fb_tunnel_init(struct net_device *dev)
1278{
1279 struct ip6_tnl *tunnel = netdev_priv(dev);
1280
1281 tunnel->dev = dev;
0bd87628 1282 tunnel->net = dev_net(dev);
c12b395a 1283 strcpy(tunnel->parms.name, dev->name);
1284
1285 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1286
1287 dev_hold(dev);
1288}
1289
1290
1291static struct inet6_protocol ip6gre_protocol __read_mostly = {
1292 .handler = ip6gre_rcv,
1293 .err_handler = ip6gre_err,
1294 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1295};
1296
1297static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
1298 struct list_head *head)
1299{
1300 int prio;
1301
1302 for (prio = 0; prio < 4; prio++) {
1303 int h;
1304 for (h = 0; h < HASH_SIZE; h++) {
1305 struct ip6_tnl *t;
1306
1307 t = rtnl_dereference(ign->tunnels[prio][h]);
1308
1309 while (t != NULL) {
1310 unregister_netdevice_queue(t->dev, head);
1311 t = rtnl_dereference(t->next);
1312 }
1313 }
1314 }
1315}
1316
1317static int __net_init ip6gre_init_net(struct net *net)
1318{
1319 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1320 int err;
1321
1322 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1323 ip6gre_tunnel_setup);
1324 if (!ign->fb_tunnel_dev) {
1325 err = -ENOMEM;
1326 goto err_alloc_dev;
1327 }
1328 dev_net_set(ign->fb_tunnel_dev, net);
1329
1330 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1331 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1332
1333 err = register_netdev(ign->fb_tunnel_dev);
1334 if (err)
1335 goto err_reg_dev;
1336
1337 rcu_assign_pointer(ign->tunnels_wc[0],
1338 netdev_priv(ign->fb_tunnel_dev));
1339 return 0;
1340
1341err_reg_dev:
1342 ip6gre_dev_free(ign->fb_tunnel_dev);
1343err_alloc_dev:
1344 return err;
1345}
1346
1347static void __net_exit ip6gre_exit_net(struct net *net)
1348{
1349 struct ip6gre_net *ign;
1350 LIST_HEAD(list);
1351
1352 ign = net_generic(net, ip6gre_net_id);
1353 rtnl_lock();
1354 ip6gre_destroy_tunnels(ign, &list);
1355 unregister_netdevice_many(&list);
1356 rtnl_unlock();
1357}
1358
1359static struct pernet_operations ip6gre_net_ops = {
1360 .init = ip6gre_init_net,
1361 .exit = ip6gre_exit_net,
1362 .id = &ip6gre_net_id,
1363 .size = sizeof(struct ip6gre_net),
1364};
1365
1366static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1367{
1368 __be16 flags;
1369
1370 if (!data)
1371 return 0;
1372
1373 flags = 0;
1374 if (data[IFLA_GRE_IFLAGS])
1375 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1376 if (data[IFLA_GRE_OFLAGS])
1377 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1378 if (flags & (GRE_VERSION|GRE_ROUTING))
1379 return -EINVAL;
1380
1381 return 0;
1382}
1383
1384static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1385{
1386 struct in6_addr daddr;
1387
1388 if (tb[IFLA_ADDRESS]) {
1389 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1390 return -EINVAL;
1391 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1392 return -EADDRNOTAVAIL;
1393 }
1394
1395 if (!data)
1396 goto out;
1397
1398 if (data[IFLA_GRE_REMOTE]) {
1399 nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1400 if (ipv6_addr_any(&daddr))
1401 return -EINVAL;
1402 }
1403
1404out:
1405 return ip6gre_tunnel_validate(tb, data);
1406}
1407
1408
1409static void ip6gre_netlink_parms(struct nlattr *data[],
1410 struct __ip6_tnl_parm *parms)
1411{
1412 memset(parms, 0, sizeof(*parms));
1413
1414 if (!data)
1415 return;
1416
1417 if (data[IFLA_GRE_LINK])
1418 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1419
1420 if (data[IFLA_GRE_IFLAGS])
1421 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1422
1423 if (data[IFLA_GRE_OFLAGS])
1424 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1425
1426 if (data[IFLA_GRE_IKEY])
1427 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1428
1429 if (data[IFLA_GRE_OKEY])
1430 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1431
1432 if (data[IFLA_GRE_LOCAL])
1433 nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
1434
1435 if (data[IFLA_GRE_REMOTE])
1436 nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
1437
1438 if (data[IFLA_GRE_TTL])
1439 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1440
1441 if (data[IFLA_GRE_ENCAP_LIMIT])
1442 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1443
1444 if (data[IFLA_GRE_FLOWINFO])
1445 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1446
1447 if (data[IFLA_GRE_FLAGS])
1448 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1449}
1450
1451static int ip6gre_tap_init(struct net_device *dev)
1452{
1453 struct ip6_tnl *tunnel;
1454
1455 tunnel = netdev_priv(dev);
1456
1457 tunnel->dev = dev;
0bd87628 1458 tunnel->net = dev_net(dev);
c12b395a 1459 strcpy(tunnel->parms.name, dev->name);
1460
1461 ip6gre_tnl_link_config(tunnel, 1);
1462
1463 dev->tstats = alloc_percpu(struct pcpu_tstats);
1464 if (!dev->tstats)
1465 return -ENOMEM;
1466
1467 return 0;
1468}
1469
1470static const struct net_device_ops ip6gre_tap_netdev_ops = {
1471 .ndo_init = ip6gre_tap_init,
1472 .ndo_uninit = ip6gre_tunnel_uninit,
1473 .ndo_start_xmit = ip6gre_tunnel_xmit,
1474 .ndo_set_mac_address = eth_mac_addr,
1475 .ndo_validate_addr = eth_validate_addr,
1476 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1477 .ndo_get_stats64 = ip_tunnel_get_stats64,
c12b395a 1478};
1479
1480static void ip6gre_tap_setup(struct net_device *dev)
1481{
1482
1483 ether_setup(dev);
1484
1485 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1486 dev->destructor = ip6gre_dev_free;
1487
1488 dev->iflink = 0;
1489 dev->features |= NETIF_F_NETNS_LOCAL;
1490}
1491
1492static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1493 struct nlattr *tb[], struct nlattr *data[])
1494{
1495 struct ip6_tnl *nt;
1496 struct net *net = dev_net(dev);
1497 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1498 int err;
1499
1500 nt = netdev_priv(dev);
1501 ip6gre_netlink_parms(data, &nt->parms);
1502
1503 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1504 return -EEXIST;
1505
1506 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1507 eth_hw_addr_random(dev);
1508
1509 nt->dev = dev;
0bd87628 1510 nt->net = dev_net(dev);
c12b395a 1511 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1512
1513 /* Can use a lockless transmit, unless we generate output sequences */
1514 if (!(nt->parms.o_flags & GRE_SEQ))
1515 dev->features |= NETIF_F_LLTX;
1516
1517 err = register_netdevice(dev);
1518 if (err)
1519 goto out;
1520
1521 dev_hold(dev);
1522 ip6gre_tunnel_link(ign, nt);
1523
1524out:
1525 return err;
1526}
1527
1528static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1529 struct nlattr *data[])
1530{
1531 struct ip6_tnl *t, *nt;
1532 struct net *net = dev_net(dev);
1533 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1534 struct __ip6_tnl_parm p;
1535
1536 if (dev == ign->fb_tunnel_dev)
1537 return -EINVAL;
1538
1539 nt = netdev_priv(dev);
1540 ip6gre_netlink_parms(data, &p);
1541
1542 t = ip6gre_tunnel_locate(net, &p, 0);
1543
1544 if (t) {
1545 if (t->dev != dev)
1546 return -EEXIST;
1547 } else {
1548 t = nt;
1549
1550 ip6gre_tunnel_unlink(ign, t);
1551 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1552 ip6gre_tunnel_link(ign, t);
1553 netdev_state_change(dev);
1554 }
1555
1556 return 0;
1557}
1558
1559static size_t ip6gre_get_size(const struct net_device *dev)
1560{
1561 return
1562 /* IFLA_GRE_LINK */
1563 nla_total_size(4) +
1564 /* IFLA_GRE_IFLAGS */
1565 nla_total_size(2) +
1566 /* IFLA_GRE_OFLAGS */
1567 nla_total_size(2) +
1568 /* IFLA_GRE_IKEY */
1569 nla_total_size(4) +
1570 /* IFLA_GRE_OKEY */
1571 nla_total_size(4) +
1572 /* IFLA_GRE_LOCAL */
a3754133 1573 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1574 /* IFLA_GRE_REMOTE */
a3754133 1575 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1576 /* IFLA_GRE_TTL */
1577 nla_total_size(1) +
1578 /* IFLA_GRE_TOS */
1579 nla_total_size(1) +
1580 /* IFLA_GRE_ENCAP_LIMIT */
1581 nla_total_size(1) +
1582 /* IFLA_GRE_FLOWINFO */
1583 nla_total_size(4) +
1584 /* IFLA_GRE_FLAGS */
1585 nla_total_size(4) +
1586 0;
1587}
1588
1589static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1590{
1591 struct ip6_tnl *t = netdev_priv(dev);
1592 struct __ip6_tnl_parm *p = &t->parms;
1593
1594 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1595 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1596 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1597 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1598 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
a3754133
ND		 1599 nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
1600 nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
c12b395a 1601 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1602 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1603 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1604 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1605 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1606 goto nla_put_failure;
1607 return 0;
1608
1609nla_put_failure:
1610 return -EMSGSIZE;
1611}
1612
1613static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1614 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1615 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1616 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1617 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1618 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1619 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1620 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1621 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1622 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1623 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1624 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1625};
1626
1627static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1628 .kind = "ip6gre",
1629 .maxtype = IFLA_GRE_MAX,
1630 .policy = ip6gre_policy,
1631 .priv_size = sizeof(struct ip6_tnl),
1632 .setup = ip6gre_tunnel_setup,
1633 .validate = ip6gre_tunnel_validate,
1634 .newlink = ip6gre_newlink,
1635 .changelink = ip6gre_changelink,
1636 .get_size = ip6gre_get_size,
1637 .fill_info = ip6gre_fill_info,
1638};
1639
1640static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1641 .kind = "ip6gretap",
1642 .maxtype = IFLA_GRE_MAX,
1643 .policy = ip6gre_policy,
1644 .priv_size = sizeof(struct ip6_tnl),
1645 .setup = ip6gre_tap_setup,
1646 .validate = ip6gre_tap_validate,
1647 .newlink = ip6gre_newlink,
1648 .changelink = ip6gre_changelink,
1649 .get_size = ip6gre_get_size,
1650 .fill_info = ip6gre_fill_info,
1651};
1652
1653/*
1654 * And now the modules code and kernel interface.
1655 */
1656
1657static int __init ip6gre_init(void)
1658{
1659 int err;
1660
1661 pr_info("GRE over IPv6 tunneling driver\n");
1662
1663 err = register_pernet_device(&ip6gre_net_ops);
1664 if (err < 0)
1665 return err;
1666
1667 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1668 if (err < 0) {
1669 pr_info("%s: can't add protocol\n", __func__);
1670 goto add_proto_failed;
1671 }
1672
1673 err = rtnl_link_register(&ip6gre_link_ops);
1674 if (err < 0)
1675 goto rtnl_link_failed;
1676
1677 err = rtnl_link_register(&ip6gre_tap_ops);
1678 if (err < 0)
1679 goto tap_ops_failed;
1680
1681out:
1682 return err;
1683
1684tap_ops_failed:
1685 rtnl_link_unregister(&ip6gre_link_ops);
1686rtnl_link_failed:
1687 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1688add_proto_failed:
1689 unregister_pernet_device(&ip6gre_net_ops);
1690 goto out;
1691}
1692
1693static void __exit ip6gre_fini(void)
1694{
1695 rtnl_link_unregister(&ip6gre_tap_ops);
1696 rtnl_link_unregister(&ip6gre_link_ops);
1697 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1698 unregister_pernet_device(&ip6gre_net_ops);
1699}
1700
1701module_init(ip6gre_init);
1702module_exit(ip6gre_fini);
1703MODULE_LICENSE("GPL");
1704MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1705MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1706MODULE_ALIAS_RTNL_LINK("ip6gre");
1707MODULE_ALIAS_NETDEV("ip6gre0");
Linux 6.x block layer and io_uring tree(s)