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1/*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
17 * Fred Templin <fred.l.templin@boeing.com>: isatap support
18 */
19
20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22#include <linux/module.h>
23#include <linux/capability.h>
24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
28#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/icmp.h>
33#include <linux/slab.h>
34#include <asm/uaccess.h>
35#include <linux/init.h>
36#include <linux/netfilter_ipv4.h>
37#include <linux/if_ether.h>
38
39#include <net/sock.h>
40#include <net/snmp.h>
41
42#include <net/ipv6.h>
43#include <net/protocol.h>
44#include <net/transp_v6.h>
45#include <net/ip6_fib.h>
46#include <net/ip6_route.h>
47#include <net/ndisc.h>
48#include <net/addrconf.h>
49#include <net/ip.h>
50#include <net/udp.h>
51#include <net/icmp.h>
52#include <net/ip_tunnels.h>
53#include <net/inet_ecn.h>
54#include <net/xfrm.h>
55#include <net/dsfield.h>
56#include <net/net_namespace.h>
57#include <net/netns/generic.h>
58
59/*
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61
62 For comments look at net/ipv4/ip_gre.c --ANK
63 */
64
65#define HASH_SIZE 16
66#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
67
68static bool log_ecn_error = true;
69module_param(log_ecn_error, bool, 0644);
70MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
72static int ipip6_tunnel_init(struct net_device *dev);
73static void ipip6_tunnel_setup(struct net_device *dev);
74static void ipip6_dev_free(struct net_device *dev);
75static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
77static struct rtnl_link_ops sit_link_ops __read_mostly;
78
79static int sit_net_id __read_mostly;
80struct sit_net {
81 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
84 struct ip_tunnel __rcu *tunnels_wc[1];
85 struct ip_tunnel __rcu **tunnels[4];
86
87 struct net_device *fb_tunnel_dev;
88};
89
90/*
91 * Must be invoked with rcu_read_lock
92 */
93static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
94 struct net_device *dev, __be32 remote, __be32 local)
95{
96 unsigned int h0 = HASH(remote);
97 unsigned int h1 = HASH(local);
98 struct ip_tunnel *t;
99 struct sit_net *sitn = net_generic(net, sit_net_id);
100
101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
102 if (local == t->parms.iph.saddr &&
103 remote == t->parms.iph.daddr &&
104 (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
105 (t->dev->flags & IFF_UP))
106 return t;
107 }
108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
109 if (remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
115 if (local == t->parms.iph.saddr &&
116 (!dev || !t->parms.link || dev->ifindex == t->parms.link) &&
117 (t->dev->flags & IFF_UP))
118 return t;
119 }
120 t = rcu_dereference(sitn->tunnels_wc[0]);
121 if ((t != NULL) && (t->dev->flags & IFF_UP))
122 return t;
123 return NULL;
124}
125
126static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
127 struct ip_tunnel_parm *parms)
128{
129 __be32 remote = parms->iph.daddr;
130 __be32 local = parms->iph.saddr;
131 unsigned int h = 0;
132 int prio = 0;
133
134 if (remote) {
135 prio |= 2;
136 h ^= HASH(remote);
137 }
138 if (local) {
139 prio |= 1;
140 h ^= HASH(local);
141 }
142 return &sitn->tunnels[prio][h];
143}
144
145static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
146 struct ip_tunnel *t)
147{
148 return __ipip6_bucket(sitn, &t->parms);
149}
150
151static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
152{
153 struct ip_tunnel __rcu **tp;
154 struct ip_tunnel *iter;
155
156 for (tp = ipip6_bucket(sitn, t);
157 (iter = rtnl_dereference(*tp)) != NULL;
158 tp = &iter->next) {
159 if (t == iter) {
160 rcu_assign_pointer(*tp, t->next);
161 break;
162 }
163 }
164}
165
166static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
167{
168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
169
170 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171 rcu_assign_pointer(*tp, t);
172}
173
174static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
175{
176#ifdef CONFIG_IPV6_SIT_6RD
177 struct ip_tunnel *t = netdev_priv(dev);
178
179 if (t->dev == sitn->fb_tunnel_dev) {
180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181 t->ip6rd.relay_prefix = 0;
182 t->ip6rd.prefixlen = 16;
183 t->ip6rd.relay_prefixlen = 0;
184 } else {
185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187 }
188#endif
189}
190
191static int ipip6_tunnel_create(struct net_device *dev)
192{
193 struct ip_tunnel *t = netdev_priv(dev);
194 struct net *net = dev_net(dev);
195 struct sit_net *sitn = net_generic(net, sit_net_id);
196 int err;
197
198 err = ipip6_tunnel_init(dev);
199 if (err < 0)
200 goto out;
201 ipip6_tunnel_clone_6rd(dev, sitn);
202
203 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
204 dev->priv_flags |= IFF_ISATAP;
205
206 err = register_netdevice(dev);
207 if (err < 0)
208 goto out;
209
210 strcpy(t->parms.name, dev->name);
211 dev->rtnl_link_ops = &sit_link_ops;
212
213 dev_hold(dev);
214
215 ipip6_tunnel_link(sitn, t);
216 return 0;
217
218out:
219 return err;
220}
221
222static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
223 struct ip_tunnel_parm *parms, int create)
224{
225 __be32 remote = parms->iph.daddr;
226 __be32 local = parms->iph.saddr;
227 struct ip_tunnel *t, *nt;
228 struct ip_tunnel __rcu **tp;
229 struct net_device *dev;
230 char name[IFNAMSIZ];
231 struct sit_net *sitn = net_generic(net, sit_net_id);
232
233 for (tp = __ipip6_bucket(sitn, parms);
234 (t = rtnl_dereference(*tp)) != NULL;
235 tp = &t->next) {
236 if (local == t->parms.iph.saddr &&
237 remote == t->parms.iph.daddr &&
238 parms->link == t->parms.link) {
239 if (create)
240 return NULL;
241 else
242 return t;
243 }
244 }
245 if (!create)
246 goto failed;
247
248 if (parms->name[0])
249 strlcpy(name, parms->name, IFNAMSIZ);
250 else
251 strcpy(name, "sit%d");
252
253 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
254 ipip6_tunnel_setup);
255 if (dev == NULL)
256 return NULL;
257
258 dev_net_set(dev, net);
259
260 nt = netdev_priv(dev);
261
262 nt->parms = *parms;
263 if (ipip6_tunnel_create(dev) < 0)
264 goto failed_free;
265
266 return nt;
267
268failed_free:
269 ipip6_dev_free(dev);
270failed:
271 return NULL;
272}
273
274#define for_each_prl_rcu(start) \
275 for (prl = rcu_dereference(start); \
276 prl; \
277 prl = rcu_dereference(prl->next))
278
279static struct ip_tunnel_prl_entry *
280__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
281{
282 struct ip_tunnel_prl_entry *prl;
283
284 for_each_prl_rcu(t->prl)
285 if (prl->addr == addr)
286 break;
287 return prl;
288
289}
290
291static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
292 struct ip_tunnel_prl __user *a)
293{
294 struct ip_tunnel_prl kprl, *kp;
295 struct ip_tunnel_prl_entry *prl;
296 unsigned int cmax, c = 0, ca, len;
297 int ret = 0;
298
299 if (copy_from_user(&kprl, a, sizeof(kprl)))
300 return -EFAULT;
301 cmax = kprl.datalen / sizeof(kprl);
302 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
303 cmax = 1;
304
305 /* For simple GET or for root users,
306 * we try harder to allocate.
307 */
308 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
309 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
310 NULL;
311
312 rcu_read_lock();
313
314 ca = t->prl_count < cmax ? t->prl_count : cmax;
315
316 if (!kp) {
317 /* We don't try hard to allocate much memory for
318 * non-root users.
319 * For root users, retry allocating enough memory for
320 * the answer.
321 */
322 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
323 if (!kp) {
324 ret = -ENOMEM;
325 goto out;
326 }
327 }
328
329 c = 0;
330 for_each_prl_rcu(t->prl) {
331 if (c >= cmax)
332 break;
333 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
334 continue;
335 kp[c].addr = prl->addr;
336 kp[c].flags = prl->flags;
337 c++;
338 if (kprl.addr != htonl(INADDR_ANY))
339 break;
340 }
341out:
342 rcu_read_unlock();
343
344 len = sizeof(*kp) * c;
345 ret = 0;
346 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
347 ret = -EFAULT;
348
349 kfree(kp);
350
351 return ret;
352}
353
354static int
355ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
356{
357 struct ip_tunnel_prl_entry *p;
358 int err = 0;
359
360 if (a->addr == htonl(INADDR_ANY))
361 return -EINVAL;
362
363 ASSERT_RTNL();
364
365 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
366 if (p->addr == a->addr) {
367 if (chg) {
368 p->flags = a->flags;
369 goto out;
370 }
371 err = -EEXIST;
372 goto out;
373 }
374 }
375
376 if (chg) {
377 err = -ENXIO;
378 goto out;
379 }
380
381 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
382 if (!p) {
383 err = -ENOBUFS;
384 goto out;
385 }
386
387 p->next = t->prl;
388 p->addr = a->addr;
389 p->flags = a->flags;
390 t->prl_count++;
391 rcu_assign_pointer(t->prl, p);
392out:
393 return err;
394}
395
396static void prl_list_destroy_rcu(struct rcu_head *head)
397{
398 struct ip_tunnel_prl_entry *p, *n;
399
400 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
401 do {
402 n = rcu_dereference_protected(p->next, 1);
403 kfree(p);
404 p = n;
405 } while (p);
406}
407
408static int
409ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
410{
411 struct ip_tunnel_prl_entry *x;
412 struct ip_tunnel_prl_entry __rcu **p;
413 int err = 0;
414
415 ASSERT_RTNL();
416
417 if (a && a->addr != htonl(INADDR_ANY)) {
418 for (p = &t->prl;
419 (x = rtnl_dereference(*p)) != NULL;
420 p = &x->next) {
421 if (x->addr == a->addr) {
422 *p = x->next;
423 kfree_rcu(x, rcu_head);
424 t->prl_count--;
425 goto out;
426 }
427 }
428 err = -ENXIO;
429 } else {
430 x = rtnl_dereference(t->prl);
431 if (x) {
432 t->prl_count = 0;
433 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
434 t->prl = NULL;
435 }
436 }
437out:
438 return err;
439}
440
441static int
442isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
443{
444 struct ip_tunnel_prl_entry *p;
445 int ok = 1;
446
447 rcu_read_lock();
448 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
449 if (p) {
450 if (p->flags & PRL_DEFAULT)
451 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
452 else
453 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
454 } else {
455 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
456
457 if (ipv6_addr_is_isatap(addr6) &&
458 (addr6->s6_addr32[3] == iph->saddr) &&
459 ipv6_chk_prefix(addr6, t->dev))
460 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
461 else
462 ok = 0;
463 }
464 rcu_read_unlock();
465 return ok;
466}
467
468static void ipip6_tunnel_uninit(struct net_device *dev)
469{
470 struct ip_tunnel *tunnel = netdev_priv(dev);
471 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
472
473 if (dev == sitn->fb_tunnel_dev) {
474 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
475 } else {
476 ipip6_tunnel_unlink(sitn, tunnel);
477 ipip6_tunnel_del_prl(tunnel, NULL);
478 }
479 ip_tunnel_dst_reset_all(tunnel);
480 dev_put(dev);
481}
482
483/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
484 * if sufficient data bytes are available
485 */
486static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
487{
488 const struct iphdr *iph = (const struct iphdr *) skb->data;
489 struct rt6_info *rt;
490 struct sk_buff *skb2;
491
492 if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct ipv6hdr) + 8))
493 return 1;
494
495 skb2 = skb_clone(skb, GFP_ATOMIC);
496
497 if (!skb2)
498 return 1;
499
500 skb_dst_drop(skb2);
501 skb_pull(skb2, iph->ihl * 4);
502 skb_reset_network_header(skb2);
503
504 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
505
506 if (rt && rt->dst.dev)
507 skb2->dev = rt->dst.dev;
508
509 icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
510
511 if (rt)
512 ip6_rt_put(rt);
513
514 kfree_skb(skb2);
515
516 return 0;
517}
518
519static int ipip6_err(struct sk_buff *skb, u32 info)
520{
521 const struct iphdr *iph = (const struct iphdr *)skb->data;
522 const int type = icmp_hdr(skb)->type;
523 const int code = icmp_hdr(skb)->code;
524 struct ip_tunnel *t;
525 int err;
526
527 switch (type) {
528 default:
529 case ICMP_PARAMETERPROB:
530 return 0;
531
532 case ICMP_DEST_UNREACH:
533 switch (code) {
534 case ICMP_SR_FAILED:
535 /* Impossible event. */
536 return 0;
537 default:
538 /* All others are translated to HOST_UNREACH.
539 rfc2003 contains "deep thoughts" about NET_UNREACH,
540 I believe they are just ether pollution. --ANK
541 */
542 break;
543 }
544 break;
545 case ICMP_TIME_EXCEEDED:
546 if (code != ICMP_EXC_TTL)
547 return 0;
548 break;
549 case ICMP_REDIRECT:
550 break;
551 }
552
553 err = -ENOENT;
554
555 t = ipip6_tunnel_lookup(dev_net(skb->dev),
556 skb->dev,
557 iph->daddr,
558 iph->saddr);
559 if (t == NULL)
560 goto out;
561
562 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
563 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
564 t->parms.link, 0, IPPROTO_IPV6, 0);
565 err = 0;
566 goto out;
567 }
568 if (type == ICMP_REDIRECT) {
569 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
570 IPPROTO_IPV6, 0);
571 err = 0;
572 goto out;
573 }
574
575 if (t->parms.iph.daddr == 0)
576 goto out;
577
578 err = 0;
579 if (!ipip6_err_gen_icmpv6_unreach(skb))
580 goto out;
581
582 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
583 goto out;
584
585 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
586 t->err_count++;
587 else
588 t->err_count = 1;
589 t->err_time = jiffies;
590out:
591 return err;
592}
593
594static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
595 const struct in6_addr *v6addr)
596{
597 __be32 v4embed = 0;
598 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
599 return true;
600 return false;
601}
602
603/* Checks if an address matches an address on the tunnel interface.
604 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
605 * Long story:
606 * This function is called after we considered the packet as spoofed
607 * in is_spoofed_6rd.
608 * We may have a router that is doing NAT for proto 41 packets
609 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
610 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
611 * function will return true, dropping the packet.
612 * But, we can still check if is spoofed against the IP
613 * addresses associated with the interface.
614 */
615static bool only_dnatted(const struct ip_tunnel *tunnel,
616 const struct in6_addr *v6dst)
617{
618 int prefix_len;
619
620#ifdef CONFIG_IPV6_SIT_6RD
621 prefix_len = tunnel->ip6rd.prefixlen + 32
622 - tunnel->ip6rd.relay_prefixlen;
623#else
624 prefix_len = 48;
625#endif
626 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
627}
628
629/* Returns true if a packet is spoofed */
630static bool packet_is_spoofed(struct sk_buff *skb,
631 const struct iphdr *iph,
632 struct ip_tunnel *tunnel)
633{
634 const struct ipv6hdr *ipv6h;
635
636 if (tunnel->dev->priv_flags & IFF_ISATAP) {
637 if (!isatap_chksrc(skb, iph, tunnel))
638 return true;
639
640 return false;
641 }
642
643 if (tunnel->dev->flags & IFF_POINTOPOINT)
644 return false;
645
646 ipv6h = ipv6_hdr(skb);
647
648 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
649 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
650 &iph->saddr, &ipv6h->saddr,
651 &iph->daddr, &ipv6h->daddr);
652 return true;
653 }
654
655 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
656 return false;
657
658 if (only_dnatted(tunnel, &ipv6h->daddr))
659 return false;
660
661 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
662 &iph->saddr, &ipv6h->saddr,
663 &iph->daddr, &ipv6h->daddr);
664 return true;
665}
666
667static int ipip6_rcv(struct sk_buff *skb)
668{
669 const struct iphdr *iph = ip_hdr(skb);
670 struct ip_tunnel *tunnel;
671 int err;
672
673 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
674 iph->saddr, iph->daddr);
675 if (tunnel != NULL) {
676 struct pcpu_sw_netstats *tstats;
677
678 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
679 tunnel->parms.iph.protocol != 0)
680 goto out;
681
682 skb->mac_header = skb->network_header;
683 skb_reset_network_header(skb);
684 IPCB(skb)->flags = 0;
685 skb->protocol = htons(ETH_P_IPV6);
686
687 if (packet_is_spoofed(skb, iph, tunnel)) {
688 tunnel->dev->stats.rx_errors++;
689 goto out;
690 }
691
692 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
693
694 err = IP_ECN_decapsulate(iph, skb);
695 if (unlikely(err)) {
696 if (log_ecn_error)
697 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
698 &iph->saddr, iph->tos);
699 if (err > 1) {
700 ++tunnel->dev->stats.rx_frame_errors;
701 ++tunnel->dev->stats.rx_errors;
702 goto out;
703 }
704 }
705
706 tstats = this_cpu_ptr(tunnel->dev->tstats);
707 u64_stats_update_begin(&tstats->syncp);
708 tstats->rx_packets++;
709 tstats->rx_bytes += skb->len;
710 u64_stats_update_end(&tstats->syncp);
711
712 netif_rx(skb);
713
714 return 0;
715 }
716
717 /* no tunnel matched, let upstream know, ipsec may handle it */
718 return 1;
719out:
720 kfree_skb(skb);
721 return 0;
722}
723
724static const struct tnl_ptk_info tpi = {
725 /* no tunnel info required for ipip. */
726 .proto = htons(ETH_P_IP),
727};
728
729static int ipip_rcv(struct sk_buff *skb)
730{
731 const struct iphdr *iph;
732 struct ip_tunnel *tunnel;
733
734 iph = ip_hdr(skb);
735 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
736 iph->saddr, iph->daddr);
737 if (tunnel != NULL) {
738 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
739 tunnel->parms.iph.protocol != 0)
740 goto drop;
741
742 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
743 goto drop;
744 if (iptunnel_pull_header(skb, 0, tpi.proto))
745 goto drop;
746 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
747 }
748
749 return 1;
750
751drop:
752 kfree_skb(skb);
753 return 0;
754}
755
756/*
757 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
758 * stores the embedded IPv4 address in v4dst and returns true.
759 */
760static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
761 __be32 *v4dst)
762{
763#ifdef CONFIG_IPV6_SIT_6RD
764 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
765 tunnel->ip6rd.prefixlen)) {
766 unsigned int pbw0, pbi0;
767 int pbi1;
768 u32 d;
769
770 pbw0 = tunnel->ip6rd.prefixlen >> 5;
771 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
772
773 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
774 tunnel->ip6rd.relay_prefixlen;
775
776 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
777 if (pbi1 > 0)
778 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
779 (32 - pbi1);
780
781 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
782 return true;
783 }
784#else
785 if (v6dst->s6_addr16[0] == htons(0x2002)) {
786 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
787 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
788 return true;
789 }
790#endif
791 return false;
792}
793
794static inline __be32 try_6rd(struct ip_tunnel *tunnel,
795 const struct in6_addr *v6dst)
796{
797 __be32 dst = 0;
798 check_6rd(tunnel, v6dst, &dst);
799 return dst;
800}
801
802/*
803 * This function assumes it is being called from dev_queue_xmit()
804 * and that skb is filled properly by that function.
805 */
806
807static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
808 struct net_device *dev)
809{
810 struct ip_tunnel *tunnel = netdev_priv(dev);
811 const struct iphdr *tiph = &tunnel->parms.iph;
812 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
813 u8 tos = tunnel->parms.iph.tos;
814 __be16 df = tiph->frag_off;
815 struct rtable *rt; /* Route to the other host */
816 struct net_device *tdev; /* Device to other host */
817 unsigned int max_headroom; /* The extra header space needed */
818 __be32 dst = tiph->daddr;
819 struct flowi4 fl4;
820 int mtu;
821 const struct in6_addr *addr6;
822 int addr_type;
823 u8 ttl;
824 int err;
825 u8 protocol = IPPROTO_IPV6;
826 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
827
828 if (skb->protocol != htons(ETH_P_IPV6))
829 goto tx_error;
830
831 if (tos == 1)
832 tos = ipv6_get_dsfield(iph6);
833
834 /* ISATAP (RFC4214) - must come before 6to4 */
835 if (dev->priv_flags & IFF_ISATAP) {
836 struct neighbour *neigh = NULL;
837 bool do_tx_error = false;
838
839 if (skb_dst(skb))
840 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
841
842 if (neigh == NULL) {
843 net_dbg_ratelimited("nexthop == NULL\n");
844 goto tx_error;
845 }
846
847 addr6 = (const struct in6_addr *)&neigh->primary_key;
848 addr_type = ipv6_addr_type(addr6);
849
850 if ((addr_type & IPV6_ADDR_UNICAST) &&
851 ipv6_addr_is_isatap(addr6))
852 dst = addr6->s6_addr32[3];
853 else
854 do_tx_error = true;
855
856 neigh_release(neigh);
857 if (do_tx_error)
858 goto tx_error;
859 }
860
861 if (!dst)
862 dst = try_6rd(tunnel, &iph6->daddr);
863
864 if (!dst) {
865 struct neighbour *neigh = NULL;
866 bool do_tx_error = false;
867
868 if (skb_dst(skb))
869 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
870
871 if (neigh == NULL) {
872 net_dbg_ratelimited("nexthop == NULL\n");
873 goto tx_error;
874 }
875
876 addr6 = (const struct in6_addr *)&neigh->primary_key;
877 addr_type = ipv6_addr_type(addr6);
878
879 if (addr_type == IPV6_ADDR_ANY) {
880 addr6 = &ipv6_hdr(skb)->daddr;
881 addr_type = ipv6_addr_type(addr6);
882 }
883
884 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
885 dst = addr6->s6_addr32[3];
886 else
887 do_tx_error = true;
888
889 neigh_release(neigh);
890 if (do_tx_error)
891 goto tx_error;
892 }
893
894 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
895 dst, tiph->saddr,
896 0, 0,
897 IPPROTO_IPV6, RT_TOS(tos),
898 tunnel->parms.link);
899 if (IS_ERR(rt)) {
900 dev->stats.tx_carrier_errors++;
901 goto tx_error_icmp;
902 }
903 if (rt->rt_type != RTN_UNICAST) {
904 ip_rt_put(rt);
905 dev->stats.tx_carrier_errors++;
906 goto tx_error_icmp;
907 }
908 tdev = rt->dst.dev;
909
910 if (tdev == dev) {
911 ip_rt_put(rt);
912 dev->stats.collisions++;
913 goto tx_error;
914 }
915
916 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
917 if (IS_ERR(skb)) {
918 ip_rt_put(rt);
919 goto out;
920 }
921
922 if (df) {
923 mtu = dst_mtu(&rt->dst) - t_hlen;
924
925 if (mtu < 68) {
926 dev->stats.collisions++;
927 ip_rt_put(rt);
928 goto tx_error;
929 }
930
931 if (mtu < IPV6_MIN_MTU) {
932 mtu = IPV6_MIN_MTU;
933 df = 0;
934 }
935
936 if (tunnel->parms.iph.daddr && skb_dst(skb))
937 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
938
939 if (skb->len > mtu && !skb_is_gso(skb)) {
940 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
941 ip_rt_put(rt);
942 goto tx_error;
943 }
944 }
945
946 if (tunnel->err_count > 0) {
947 if (time_before(jiffies,
948 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
949 tunnel->err_count--;
950 dst_link_failure(skb);
951 } else
952 tunnel->err_count = 0;
953 }
954
955 /*
956 * Okay, now see if we can stuff it in the buffer as-is.
957 */
958 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;
959
960 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
961 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
962 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
963 if (!new_skb) {
964 ip_rt_put(rt);
965 dev->stats.tx_dropped++;
966 kfree_skb(skb);
967 return NETDEV_TX_OK;
968 }
969 if (skb->sk)
970 skb_set_owner_w(new_skb, skb->sk);
971 dev_kfree_skb(skb);
972 skb = new_skb;
973 iph6 = ipv6_hdr(skb);
974 }
975 ttl = tiph->ttl;
976 if (ttl == 0)
977 ttl = iph6->hop_limit;
978 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
979
980 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
981 ip_rt_put(rt);
982 goto tx_error;
983 }
984
985 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
986
987 err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr,
988 protocol, tos, ttl, df,
989 !net_eq(tunnel->net, dev_net(dev)));
990 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
991 return NETDEV_TX_OK;
992
993tx_error_icmp:
994 dst_link_failure(skb);
995tx_error:
996 kfree_skb(skb);
997out:
998 dev->stats.tx_errors++;
999 return NETDEV_TX_OK;
1000}
1001
1002static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
1003{
1004 struct ip_tunnel *tunnel = netdev_priv(dev);
1005 const struct iphdr *tiph = &tunnel->parms.iph;
1006
1007 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
1008 if (IS_ERR(skb))
1009 goto out;
1010
1011 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1012
1013 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
1014 return NETDEV_TX_OK;
1015out:
1016 dev->stats.tx_errors++;
1017 return NETDEV_TX_OK;
1018}
1019
1020static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1021 struct net_device *dev)
1022{
1023 switch (skb->protocol) {
1024 case htons(ETH_P_IP):
1025 ipip_tunnel_xmit(skb, dev);
1026 break;
1027 case htons(ETH_P_IPV6):
1028 ipip6_tunnel_xmit(skb, dev);
1029 break;
1030 default:
1031 goto tx_err;
1032 }
1033
1034 return NETDEV_TX_OK;
1035
1036tx_err:
1037 dev->stats.tx_errors++;
1038 kfree_skb(skb);
1039 return NETDEV_TX_OK;
1040
1041}
1042
1043static void ipip6_tunnel_bind_dev(struct net_device *dev)
1044{
1045 struct net_device *tdev = NULL;
1046 struct ip_tunnel *tunnel;
1047 const struct iphdr *iph;
1048 struct flowi4 fl4;
1049
1050 tunnel = netdev_priv(dev);
1051 iph = &tunnel->parms.iph;
1052
1053 if (iph->daddr) {
1054 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1055 NULL,
1056 iph->daddr, iph->saddr,
1057 0, 0,
1058 IPPROTO_IPV6,
1059 RT_TOS(iph->tos),
1060 tunnel->parms.link);
1061
1062 if (!IS_ERR(rt)) {
1063 tdev = rt->dst.dev;
1064 ip_rt_put(rt);
1065 }
1066 dev->flags |= IFF_POINTOPOINT;
1067 }
1068
1069 if (!tdev && tunnel->parms.link)
1070 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1071
1072 if (tdev) {
1073 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1074
1075 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1076 dev->mtu = tdev->mtu - t_hlen;
1077 if (dev->mtu < IPV6_MIN_MTU)
1078 dev->mtu = IPV6_MIN_MTU;
1079 }
1080 dev->iflink = tunnel->parms.link;
1081}
1082
1083static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1084{
1085 struct net *net = t->net;
1086 struct sit_net *sitn = net_generic(net, sit_net_id);
1087
1088 ipip6_tunnel_unlink(sitn, t);
1089 synchronize_net();
1090 t->parms.iph.saddr = p->iph.saddr;
1091 t->parms.iph.daddr = p->iph.daddr;
1092 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1093 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1094 ipip6_tunnel_link(sitn, t);
1095 t->parms.iph.ttl = p->iph.ttl;
1096 t->parms.iph.tos = p->iph.tos;
1097 if (t->parms.link != p->link) {
1098 t->parms.link = p->link;
1099 ipip6_tunnel_bind_dev(t->dev);
1100 }
1101 ip_tunnel_dst_reset_all(t);
1102 netdev_state_change(t->dev);
1103}
1104
1105#ifdef CONFIG_IPV6_SIT_6RD
1106static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1107 struct ip_tunnel_6rd *ip6rd)
1108{
1109 struct in6_addr prefix;
1110 __be32 relay_prefix;
1111
1112 if (ip6rd->relay_prefixlen > 32 ||
1113 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1114 return -EINVAL;
1115
1116 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1117 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1118 return -EINVAL;
1119 if (ip6rd->relay_prefixlen)
1120 relay_prefix = ip6rd->relay_prefix &
1121 htonl(0xffffffffUL <<
1122 (32 - ip6rd->relay_prefixlen));
1123 else
1124 relay_prefix = 0;
1125 if (relay_prefix != ip6rd->relay_prefix)
1126 return -EINVAL;
1127
1128 t->ip6rd.prefix = prefix;
1129 t->ip6rd.relay_prefix = relay_prefix;
1130 t->ip6rd.prefixlen = ip6rd->prefixlen;
1131 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1132 ip_tunnel_dst_reset_all(t);
1133 netdev_state_change(t->dev);
1134 return 0;
1135}
1136#endif
1137
1138static int
1139ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1140{
1141 int err = 0;
1142 struct ip_tunnel_parm p;
1143 struct ip_tunnel_prl prl;
1144 struct ip_tunnel *t = netdev_priv(dev);
1145 struct net *net = t->net;
1146 struct sit_net *sitn = net_generic(net, sit_net_id);
1147#ifdef CONFIG_IPV6_SIT_6RD
1148 struct ip_tunnel_6rd ip6rd;
1149#endif
1150
1151 switch (cmd) {
1152 case SIOCGETTUNNEL:
1153#ifdef CONFIG_IPV6_SIT_6RD
1154 case SIOCGET6RD:
1155#endif
1156 if (dev == sitn->fb_tunnel_dev) {
1157 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1158 err = -EFAULT;
1159 break;
1160 }
1161 t = ipip6_tunnel_locate(net, &p, 0);
1162 if (t == NULL)
1163 t = netdev_priv(dev);
1164 }
1165
1166 err = -EFAULT;
1167 if (cmd == SIOCGETTUNNEL) {
1168 memcpy(&p, &t->parms, sizeof(p));
1169 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1170 sizeof(p)))
1171 goto done;
1172#ifdef CONFIG_IPV6_SIT_6RD
1173 } else {
1174 ip6rd.prefix = t->ip6rd.prefix;
1175 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1176 ip6rd.prefixlen = t->ip6rd.prefixlen;
1177 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1178 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1179 sizeof(ip6rd)))
1180 goto done;
1181#endif
1182 }
1183 err = 0;
1184 break;
1185
1186 case SIOCADDTUNNEL:
1187 case SIOCCHGTUNNEL:
1188 err = -EPERM;
1189 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1190 goto done;
1191
1192 err = -EFAULT;
1193 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1194 goto done;
1195
1196 err = -EINVAL;
1197 if (p.iph.protocol != IPPROTO_IPV6 &&
1198 p.iph.protocol != IPPROTO_IPIP &&
1199 p.iph.protocol != 0)
1200 goto done;
1201 if (p.iph.version != 4 ||
1202 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1203 goto done;
1204 if (p.iph.ttl)
1205 p.iph.frag_off |= htons(IP_DF);
1206
1207 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1208
1209 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1210 if (t != NULL) {
1211 if (t->dev != dev) {
1212 err = -EEXIST;
1213 break;
1214 }
1215 } else {
1216 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1217 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1218 err = -EINVAL;
1219 break;
1220 }
1221 t = netdev_priv(dev);
1222 }
1223
1224 ipip6_tunnel_update(t, &p);
1225 }
1226
1227 if (t) {
1228 err = 0;
1229 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1230 err = -EFAULT;
1231 } else
1232 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1233 break;
1234
1235 case SIOCDELTUNNEL:
1236 err = -EPERM;
1237 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1238 goto done;
1239
1240 if (dev == sitn->fb_tunnel_dev) {
1241 err = -EFAULT;
1242 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1243 goto done;
1244 err = -ENOENT;
1245 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1246 goto done;
1247 err = -EPERM;
1248 if (t == netdev_priv(sitn->fb_tunnel_dev))
1249 goto done;
1250 dev = t->dev;
1251 }
1252 unregister_netdevice(dev);
1253 err = 0;
1254 break;
1255
1256 case SIOCGETPRL:
1257 err = -EINVAL;
1258 if (dev == sitn->fb_tunnel_dev)
1259 goto done;
1260 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1261 break;
1262
1263 case SIOCADDPRL:
1264 case SIOCDELPRL:
1265 case SIOCCHGPRL:
1266 err = -EPERM;
1267 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1268 goto done;
1269 err = -EINVAL;
1270 if (dev == sitn->fb_tunnel_dev)
1271 goto done;
1272 err = -EFAULT;
1273 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1274 goto done;
1275
1276 switch (cmd) {
1277 case SIOCDELPRL:
1278 err = ipip6_tunnel_del_prl(t, &prl);
1279 break;
1280 case SIOCADDPRL:
1281 case SIOCCHGPRL:
1282 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1283 break;
1284 }
1285 ip_tunnel_dst_reset_all(t);
1286 netdev_state_change(dev);
1287 break;
1288
1289#ifdef CONFIG_IPV6_SIT_6RD
1290 case SIOCADD6RD:
1291 case SIOCCHG6RD:
1292 case SIOCDEL6RD:
1293 err = -EPERM;
1294 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1295 goto done;
1296
1297 err = -EFAULT;
1298 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1299 sizeof(ip6rd)))
1300 goto done;
1301
1302 if (cmd != SIOCDEL6RD) {
1303 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1304 if (err < 0)
1305 goto done;
1306 } else
1307 ipip6_tunnel_clone_6rd(dev, sitn);
1308
1309 err = 0;
1310 break;
1311#endif
1312
1313 default:
1314 err = -EINVAL;
1315 }
1316
1317done:
1318 return err;
1319}
1320
1321static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1322{
1323 struct ip_tunnel *tunnel = netdev_priv(dev);
1324 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1325
1326 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen)
1327 return -EINVAL;
1328 dev->mtu = new_mtu;
1329 return 0;
1330}
1331
1332static const struct net_device_ops ipip6_netdev_ops = {
1333 .ndo_uninit = ipip6_tunnel_uninit,
1334 .ndo_start_xmit = sit_tunnel_xmit,
1335 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1336 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1337 .ndo_get_stats64 = ip_tunnel_get_stats64,
1338};
1339
1340static void ipip6_dev_free(struct net_device *dev)
1341{
1342 struct ip_tunnel *tunnel = netdev_priv(dev);
1343
1344 free_percpu(tunnel->dst_cache);
1345 free_percpu(dev->tstats);
1346 free_netdev(dev);
1347}
1348
1349#define SIT_FEATURES (NETIF_F_SG | \
1350 NETIF_F_FRAGLIST | \
1351 NETIF_F_HIGHDMA | \
1352 NETIF_F_GSO_SOFTWARE | \
1353 NETIF_F_HW_CSUM)
1354
1355static void ipip6_tunnel_setup(struct net_device *dev)
1356{
1357 struct ip_tunnel *tunnel = netdev_priv(dev);
1358 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1359
1360 dev->netdev_ops = &ipip6_netdev_ops;
1361 dev->destructor = ipip6_dev_free;
1362
1363 dev->type = ARPHRD_SIT;
1364 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1365 dev->mtu = ETH_DATA_LEN - t_hlen;
1366 dev->flags = IFF_NOARP;
1367 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1368 dev->iflink = 0;
1369 dev->addr_len = 4;
1370 dev->features |= NETIF_F_LLTX;
1371 dev->features |= SIT_FEATURES;
1372 dev->hw_features |= SIT_FEATURES;
1373}
1374
1375static int ipip6_tunnel_init(struct net_device *dev)
1376{
1377 struct ip_tunnel *tunnel = netdev_priv(dev);
1378
1379 tunnel->dev = dev;
1380 tunnel->net = dev_net(dev);
1381
1382 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1383 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1384
1385 ipip6_tunnel_bind_dev(dev);
1386 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1387 if (!dev->tstats)
1388 return -ENOMEM;
1389
1390 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1391 if (!tunnel->dst_cache) {
1392 free_percpu(dev->tstats);
1393 return -ENOMEM;
1394 }
1395
1396 return 0;
1397}
1398
1399static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1400{
1401 struct ip_tunnel *tunnel = netdev_priv(dev);
1402 struct iphdr *iph = &tunnel->parms.iph;
1403 struct net *net = dev_net(dev);
1404 struct sit_net *sitn = net_generic(net, sit_net_id);
1405
1406 tunnel->dev = dev;
1407 tunnel->net = dev_net(dev);
1408 strcpy(tunnel->parms.name, dev->name);
1409
1410 iph->version = 4;
1411 iph->protocol = IPPROTO_IPV6;
1412 iph->ihl = 5;
1413 iph->ttl = 64;
1414
1415 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1416 if (!dev->tstats)
1417 return -ENOMEM;
1418
1419 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1420 if (!tunnel->dst_cache) {
1421 free_percpu(dev->tstats);
1422 return -ENOMEM;
1423 }
1424
1425 dev_hold(dev);
1426 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1427 return 0;
1428}
1429
1430static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1431{
1432 u8 proto;
1433
1434 if (!data || !data[IFLA_IPTUN_PROTO])
1435 return 0;
1436
1437 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1438 if (proto != IPPROTO_IPV6 &&
1439 proto != IPPROTO_IPIP &&
1440 proto != 0)
1441 return -EINVAL;
1442
1443 return 0;
1444}
1445
1446static void ipip6_netlink_parms(struct nlattr *data[],
1447 struct ip_tunnel_parm *parms)
1448{
1449 memset(parms, 0, sizeof(*parms));
1450
1451 parms->iph.version = 4;
1452 parms->iph.protocol = IPPROTO_IPV6;
1453 parms->iph.ihl = 5;
1454 parms->iph.ttl = 64;
1455
1456 if (!data)
1457 return;
1458
1459 if (data[IFLA_IPTUN_LINK])
1460 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1461
1462 if (data[IFLA_IPTUN_LOCAL])
1463 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1464
1465 if (data[IFLA_IPTUN_REMOTE])
1466 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1467
1468 if (data[IFLA_IPTUN_TTL]) {
1469 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1470 if (parms->iph.ttl)
1471 parms->iph.frag_off = htons(IP_DF);
1472 }
1473
1474 if (data[IFLA_IPTUN_TOS])
1475 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1476
1477 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1478 parms->iph.frag_off = htons(IP_DF);
1479
1480 if (data[IFLA_IPTUN_FLAGS])
1481 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1482
1483 if (data[IFLA_IPTUN_PROTO])
1484 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1485
1486}
1487
1488/* This function returns true when ENCAP attributes are present in the nl msg */
1489static bool ipip6_netlink_encap_parms(struct nlattr *data[],
1490 struct ip_tunnel_encap *ipencap)
1491{
1492 bool ret = false;
1493
1494 memset(ipencap, 0, sizeof(*ipencap));
1495
1496 if (!data)
1497 return ret;
1498
1499 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1500 ret = true;
1501 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1502 }
1503
1504 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1505 ret = true;
1506 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1507 }
1508
1509 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1510 ret = true;
1511 ipencap->sport = nla_get_u16(data[IFLA_IPTUN_ENCAP_SPORT]);
1512 }
1513
1514 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1515 ret = true;
1516 ipencap->dport = nla_get_u16(data[IFLA_IPTUN_ENCAP_DPORT]);
1517 }
1518
1519 return ret;
1520}
1521
1522#ifdef CONFIG_IPV6_SIT_6RD
1523/* This function returns true when 6RD attributes are present in the nl msg */
1524static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1525 struct ip_tunnel_6rd *ip6rd)
1526{
1527 bool ret = false;
1528 memset(ip6rd, 0, sizeof(*ip6rd));
1529
1530 if (!data)
1531 return ret;
1532
1533 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1534 ret = true;
1535 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1536 sizeof(struct in6_addr));
1537 }
1538
1539 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1540 ret = true;
1541 ip6rd->relay_prefix =
1542 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1543 }
1544
1545 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1546 ret = true;
1547 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1548 }
1549
1550 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1551 ret = true;
1552 ip6rd->relay_prefixlen =
1553 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1554 }
1555
1556 return ret;
1557}
1558#endif
1559
1560static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1561 struct nlattr *tb[], struct nlattr *data[])
1562{
1563 struct net *net = dev_net(dev);
1564 struct ip_tunnel *nt;
1565 struct ip_tunnel_encap ipencap;
1566#ifdef CONFIG_IPV6_SIT_6RD
1567 struct ip_tunnel_6rd ip6rd;
1568#endif
1569 int err;
1570
1571 nt = netdev_priv(dev);
1572
1573 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1574 err = ip_tunnel_encap_setup(nt, &ipencap);
1575 if (err < 0)
1576 return err;
1577 }
1578
1579 ipip6_netlink_parms(data, &nt->parms);
1580
1581 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1582 return -EEXIST;
1583
1584 err = ipip6_tunnel_create(dev);
1585 if (err < 0)
1586 return err;
1587
1588#ifdef CONFIG_IPV6_SIT_6RD
1589 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1590 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1591#endif
1592
1593 return err;
1594}
1595
1596static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1597 struct nlattr *data[])
1598{
1599 struct ip_tunnel *t = netdev_priv(dev);
1600 struct ip_tunnel_parm p;
1601 struct ip_tunnel_encap ipencap;
1602 struct net *net = t->net;
1603 struct sit_net *sitn = net_generic(net, sit_net_id);
1604#ifdef CONFIG_IPV6_SIT_6RD
1605 struct ip_tunnel_6rd ip6rd;
1606#endif
1607 int err;
1608
1609 if (dev == sitn->fb_tunnel_dev)
1610 return -EINVAL;
1611
1612 if (ipip6_netlink_encap_parms(data, &ipencap)) {
1613 err = ip_tunnel_encap_setup(t, &ipencap);
1614 if (err < 0)
1615 return err;
1616 }
1617
1618 ipip6_netlink_parms(data, &p);
1619
1620 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1621 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1622 return -EINVAL;
1623
1624 t = ipip6_tunnel_locate(net, &p, 0);
1625
1626 if (t) {
1627 if (t->dev != dev)
1628 return -EEXIST;
1629 } else
1630 t = netdev_priv(dev);
1631
1632 ipip6_tunnel_update(t, &p);
1633
1634#ifdef CONFIG_IPV6_SIT_6RD
1635 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1636 return ipip6_tunnel_update_6rd(t, &ip6rd);
1637#endif
1638
1639 return 0;
1640}
1641
1642static size_t ipip6_get_size(const struct net_device *dev)
1643{
1644 return
1645 /* IFLA_IPTUN_LINK */
1646 nla_total_size(4) +
1647 /* IFLA_IPTUN_LOCAL */
1648 nla_total_size(4) +
1649 /* IFLA_IPTUN_REMOTE */
1650 nla_total_size(4) +
1651 /* IFLA_IPTUN_TTL */
1652 nla_total_size(1) +
1653 /* IFLA_IPTUN_TOS */
1654 nla_total_size(1) +
1655 /* IFLA_IPTUN_PMTUDISC */
1656 nla_total_size(1) +
1657 /* IFLA_IPTUN_FLAGS */
1658 nla_total_size(2) +
1659 /* IFLA_IPTUN_PROTO */
1660 nla_total_size(1) +
1661#ifdef CONFIG_IPV6_SIT_6RD
1662 /* IFLA_IPTUN_6RD_PREFIX */
1663 nla_total_size(sizeof(struct in6_addr)) +
1664 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1665 nla_total_size(4) +
1666 /* IFLA_IPTUN_6RD_PREFIXLEN */
1667 nla_total_size(2) +
1668 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1669 nla_total_size(2) +
1670#endif
1671 /* IFLA_IPTUN_ENCAP_TYPE */
1672 nla_total_size(2) +
1673 /* IFLA_IPTUN_ENCAP_FLAGS */
1674 nla_total_size(2) +
1675 /* IFLA_IPTUN_ENCAP_SPORT */
1676 nla_total_size(2) +
1677 /* IFLA_IPTUN_ENCAP_DPORT */
1678 nla_total_size(2) +
1679 0;
1680}
1681
1682static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1683{
1684 struct ip_tunnel *tunnel = netdev_priv(dev);
1685 struct ip_tunnel_parm *parm = &tunnel->parms;
1686
1687 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1688 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1689 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1690 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1691 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1692 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1693 !!(parm->iph.frag_off & htons(IP_DF))) ||
1694 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1695 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1696 goto nla_put_failure;
1697
1698#ifdef CONFIG_IPV6_SIT_6RD
1699 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1700 &tunnel->ip6rd.prefix) ||
1701 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1702 tunnel->ip6rd.relay_prefix) ||
1703 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1704 tunnel->ip6rd.prefixlen) ||
1705 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1706 tunnel->ip6rd.relay_prefixlen))
1707 goto nla_put_failure;
1708#endif
1709
1710 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
1711 tunnel->encap.type) ||
1712 nla_put_u16(skb, IFLA_IPTUN_ENCAP_SPORT,
1713 tunnel->encap.sport) ||
1714 nla_put_u16(skb, IFLA_IPTUN_ENCAP_DPORT,
1715 tunnel->encap.dport) ||
1716 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
1717 tunnel->encap.dport))
1718 goto nla_put_failure;
1719
1720 return 0;
1721
1722nla_put_failure:
1723 return -EMSGSIZE;
1724}
1725
1726static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1727 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1728 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1729 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1730 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1731 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1732 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1733 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1734 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1735#ifdef CONFIG_IPV6_SIT_6RD
1736 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1737 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1738 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1739 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1740#endif
1741 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
1742 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
1743 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
1744 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
1745};
1746
1747static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1748{
1749 struct net *net = dev_net(dev);
1750 struct sit_net *sitn = net_generic(net, sit_net_id);
1751
1752 if (dev != sitn->fb_tunnel_dev)
1753 unregister_netdevice_queue(dev, head);
1754}
1755
1756static struct rtnl_link_ops sit_link_ops __read_mostly = {
1757 .kind = "sit",
1758 .maxtype = IFLA_IPTUN_MAX,
1759 .policy = ipip6_policy,
1760 .priv_size = sizeof(struct ip_tunnel),
1761 .setup = ipip6_tunnel_setup,
1762 .validate = ipip6_validate,
1763 .newlink = ipip6_newlink,
1764 .changelink = ipip6_changelink,
1765 .get_size = ipip6_get_size,
1766 .fill_info = ipip6_fill_info,
1767 .dellink = ipip6_dellink,
1768};
1769
1770static struct xfrm_tunnel sit_handler __read_mostly = {
1771 .handler = ipip6_rcv,
1772 .err_handler = ipip6_err,
1773 .priority = 1,
1774};
1775
1776static struct xfrm_tunnel ipip_handler __read_mostly = {
1777 .handler = ipip_rcv,
1778 .err_handler = ipip6_err,
1779 .priority = 2,
1780};
1781
1782static void __net_exit sit_destroy_tunnels(struct net *net,
1783 struct list_head *head)
1784{
1785 struct sit_net *sitn = net_generic(net, sit_net_id);
1786 struct net_device *dev, *aux;
1787 int prio;
1788
1789 for_each_netdev_safe(net, dev, aux)
1790 if (dev->rtnl_link_ops == &sit_link_ops)
1791 unregister_netdevice_queue(dev, head);
1792
1793 for (prio = 1; prio < 4; prio++) {
1794 int h;
1795 for (h = 0; h < HASH_SIZE; h++) {
1796 struct ip_tunnel *t;
1797
1798 t = rtnl_dereference(sitn->tunnels[prio][h]);
1799 while (t != NULL) {
1800 /* If dev is in the same netns, it has already
1801 * been added to the list by the previous loop.
1802 */
1803 if (!net_eq(dev_net(t->dev), net))
1804 unregister_netdevice_queue(t->dev,
1805 head);
1806 t = rtnl_dereference(t->next);
1807 }
1808 }
1809 }
1810}
1811
1812static int __net_init sit_init_net(struct net *net)
1813{
1814 struct sit_net *sitn = net_generic(net, sit_net_id);
1815 struct ip_tunnel *t;
1816 int err;
1817
1818 sitn->tunnels[0] = sitn->tunnels_wc;
1819 sitn->tunnels[1] = sitn->tunnels_l;
1820 sitn->tunnels[2] = sitn->tunnels_r;
1821 sitn->tunnels[3] = sitn->tunnels_r_l;
1822
1823 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1824 NET_NAME_UNKNOWN,
1825 ipip6_tunnel_setup);
1826 if (!sitn->fb_tunnel_dev) {
1827 err = -ENOMEM;
1828 goto err_alloc_dev;
1829 }
1830 dev_net_set(sitn->fb_tunnel_dev, net);
1831 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1832 /* FB netdevice is special: we have one, and only one per netns.
1833 * Allowing to move it to another netns is clearly unsafe.
1834 */
1835 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1836
1837 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1838 if (err)
1839 goto err_dev_free;
1840
1841 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1842
1843 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1844 goto err_reg_dev;
1845
1846 t = netdev_priv(sitn->fb_tunnel_dev);
1847
1848 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1849 return 0;
1850
1851err_reg_dev:
1852 dev_put(sitn->fb_tunnel_dev);
1853err_dev_free:
1854 ipip6_dev_free(sitn->fb_tunnel_dev);
1855err_alloc_dev:
1856 return err;
1857}
1858
1859static void __net_exit sit_exit_net(struct net *net)
1860{
1861 LIST_HEAD(list);
1862
1863 rtnl_lock();
1864 sit_destroy_tunnels(net, &list);
1865 unregister_netdevice_many(&list);
1866 rtnl_unlock();
1867}
1868
1869static struct pernet_operations sit_net_ops = {
1870 .init = sit_init_net,
1871 .exit = sit_exit_net,
1872 .id = &sit_net_id,
1873 .size = sizeof(struct sit_net),
1874};
1875
1876static void __exit sit_cleanup(void)
1877{
1878 rtnl_link_unregister(&sit_link_ops);
1879 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1880 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1881
1882 unregister_pernet_device(&sit_net_ops);
1883 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1884}
1885
1886static int __init sit_init(void)
1887{
1888 int err;
1889
1890 pr_info("IPv6 over IPv4 tunneling driver\n");
1891
1892 err = register_pernet_device(&sit_net_ops);
1893 if (err < 0)
1894 return err;
1895 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1896 if (err < 0) {
1897 pr_info("%s: can't register ip6ip4\n", __func__);
1898 goto xfrm_tunnel_failed;
1899 }
1900 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1901 if (err < 0) {
1902 pr_info("%s: can't register ip4ip4\n", __func__);
1903 goto xfrm_tunnel4_failed;
1904 }
1905 err = rtnl_link_register(&sit_link_ops);
1906 if (err < 0)
1907 goto rtnl_link_failed;
1908
1909out:
1910 return err;
1911
1912rtnl_link_failed:
1913 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1914xfrm_tunnel4_failed:
1915 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1916xfrm_tunnel_failed:
1917 unregister_pernet_device(&sit_net_ops);
1918 goto out;
1919}
1920
1921module_init(sit_init);
1922module_exit(sit_cleanup);
1923MODULE_LICENSE("GPL");
1924MODULE_ALIAS_RTNL_LINK("sit");
1925MODULE_ALIAS_NETDEV("sit0");
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