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net/802/fc.c: Fix compilation warnings
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / ndisc.c
CommitLineData
1da177e4
LT		 1/*
2 * Neighbour Discovery for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Mike Shaver <shaver@ingenia.com>
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
15/*
16 * Changes:
17 *
31910575
PY		 18 * Pierre Ynard : export userland ND options
19 * through netlink (RDNSS support)
1da177e4
LT		 20 * Lars Fenneberg : fixed MTU setting on receipt
21 * of an RA.
1da177e4
LT		 22 * Janos Farkas : kmalloc failure checks
23 * Alexey Kuznetsov : state machine reworked
24 * and moved to net/core.
25 * Pekka Savola : RFC2461 validation
26 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
27 */
28
29/* Set to 3 to get tracing... */
30#define ND_DEBUG 1
31
32#define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0)
33#define ND_NOPRINTK(x...) do { ; } while(0)
34#define ND_PRINTK0 ND_PRINTK
35#define ND_PRINTK1 ND_NOPRINTK
36#define ND_PRINTK2 ND_NOPRINTK
37#define ND_PRINTK3 ND_NOPRINTK
38#if ND_DEBUG >= 1
39#undef ND_PRINTK1
40#define ND_PRINTK1 ND_PRINTK
41#endif
42#if ND_DEBUG >= 2
43#undef ND_PRINTK2
44#define ND_PRINTK2 ND_PRINTK
45#endif
46#if ND_DEBUG >= 3
47#undef ND_PRINTK3
48#define ND_PRINTK3 ND_PRINTK
49#endif
50
51#include <linux/module.h>
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/types.h>
54#include <linux/socket.h>
55#include <linux/sockios.h>
56#include <linux/sched.h>
57#include <linux/net.h>
58#include <linux/in6.h>
59#include <linux/route.h>
60#include <linux/init.h>
61#include <linux/rcupdate.h>
62#ifdef CONFIG_SYSCTL
63#include <linux/sysctl.h>
64#endif
65
1823730f 66#include <linux/if_addr.h>
1da177e4
LT		 67#include <linux/if_arp.h>
68#include <linux/ipv6.h>
69#include <linux/icmpv6.h>
70#include <linux/jhash.h>
71
72#include <net/sock.h>
73#include <net/snmp.h>
74
75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/icmp.h>
81
31910575
PY		 82#include <net/netlink.h>
83#include <linux/rtnetlink.h>
84
1da177e4
LT		 85#include <net/flow.h>
86#include <net/ip6_checksum.h>
1ed8516f 87#include <net/inet_common.h>
1da177e4
LT		 88#include <linux/proc_fs.h>
89
90#include <linux/netfilter.h>
91#include <linux/netfilter_ipv6.h>
92
1da177e4
LT		 93static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
94static int ndisc_constructor(struct neighbour *neigh);
95static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
96static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
97static int pndisc_constructor(struct pneigh_entry *n);
98static void pndisc_destructor(struct pneigh_entry *n);
99static void pndisc_redo(struct sk_buff *skb);
100
101static struct neigh_ops ndisc_generic_ops = {
102 .family = AF_INET6,
103 .solicit = ndisc_solicit,
104 .error_report = ndisc_error_report,
105 .output = neigh_resolve_output,
106 .connected_output = neigh_connected_output,
107 .hh_output = dev_queue_xmit,
108 .queue_xmit = dev_queue_xmit,
109};
110
111static struct neigh_ops ndisc_hh_ops = {
112 .family = AF_INET6,
113 .solicit = ndisc_solicit,
114 .error_report = ndisc_error_report,
115 .output = neigh_resolve_output,
116 .connected_output = neigh_resolve_output,
117 .hh_output = dev_queue_xmit,
118 .queue_xmit = dev_queue_xmit,
119};
120
121
122static struct neigh_ops ndisc_direct_ops = {
123 .family = AF_INET6,
124 .output = dev_queue_xmit,
125 .connected_output = dev_queue_xmit,
126 .hh_output = dev_queue_xmit,
127 .queue_xmit = dev_queue_xmit,
128};
129
130struct neigh_table nd_tbl = {
131 .family = AF_INET6,
132 .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr),
133 .key_len = sizeof(struct in6_addr),
134 .hash = ndisc_hash,
135 .constructor = ndisc_constructor,
136 .pconstructor = pndisc_constructor,
137 .pdestructor = pndisc_destructor,
138 .proxy_redo = pndisc_redo,
139 .id = "ndisc_cache",
140 .parms = {
141 .tbl = &nd_tbl,
142 .base_reachable_time = 30 * HZ,
143 .retrans_time = 1 * HZ,
144 .gc_staletime = 60 * HZ,
145 .reachable_time = 30 * HZ,
146 .delay_probe_time = 5 * HZ,
147 .queue_len = 3,
148 .ucast_probes = 3,
149 .mcast_probes = 3,
150 .anycast_delay = 1 * HZ,
151 .proxy_delay = (8 * HZ) / 10,
152 .proxy_qlen = 64,
153 },
154 .gc_interval = 30 * HZ,
155 .gc_thresh1 = 128,
156 .gc_thresh2 = 512,
157 .gc_thresh3 = 1024,
158};
159
160/* ND options */
161struct ndisc_options {
70ceb4f5
YH		 162 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
163#ifdef CONFIG_IPV6_ROUTE_INFO
164 struct nd_opt_hdr *nd_opts_ri;
165 struct nd_opt_hdr *nd_opts_ri_end;
166#endif
31910575
PY		 167 struct nd_opt_hdr *nd_useropts;
168 struct nd_opt_hdr *nd_useropts_end;
1da177e4
LT		 169};
170
171#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
172#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
173#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
174#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
175#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
176#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
177
178#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
179
180/*
181 * Return the padding between the option length and the start of the
182 * link addr. Currently only IP-over-InfiniBand needs this, although
183 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
184 * also need a pad of 2.
185 */
186static int ndisc_addr_option_pad(unsigned short type)
187{
188 switch (type) {
189 case ARPHRD_INFINIBAND: return 2;
190 default: return 0;
191 }
192}
193
194static inline int ndisc_opt_addr_space(struct net_device *dev)
195{
196 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
197}
198
199static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
200 unsigned short addr_type)
201{
202 int space = NDISC_OPT_SPACE(data_len);
203 int pad = ndisc_addr_option_pad(addr_type);
204
205 opt[0] = type;
206 opt[1] = space>>3;
207
208 memset(opt + 2, 0, pad);
209 opt += pad;
210 space -= pad;
211
212 memcpy(opt+2, data, data_len);
213 data_len += 2;
214 opt += data_len;
215 if ((space -= data_len) > 0)
216 memset(opt, 0, space);
217 return opt + space;
218}
219
220static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
221 struct nd_opt_hdr *end)
222{
223 int type;
224 if (!cur || !end || cur >= end)
225 return NULL;
226 type = cur->nd_opt_type;
227 do {
228 cur = ((void *)cur) + (cur->nd_opt_len << 3);
229 } while(cur < end && cur->nd_opt_type != type);
230 return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
231}
232
31910575
PY		 233static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
234{
235 return (opt->nd_opt_type == ND_OPT_RDNSS);
236}
237
238static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
239 struct nd_opt_hdr *end)
240{
241 if (!cur || !end || cur >= end)
242 return NULL;
243 do {
244 cur = ((void *)cur) + (cur->nd_opt_len << 3);
245 } while(cur < end && !ndisc_is_useropt(cur));
246 return (cur <= end && ndisc_is_useropt(cur) ? cur : NULL);
247}
248
1da177e4
LT		 249static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
250 struct ndisc_options *ndopts)
251{
252 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
253
254 if (!nd_opt || opt_len < 0 || !ndopts)
255 return NULL;
256 memset(ndopts, 0, sizeof(*ndopts));
257 while (opt_len) {
258 int l;
259 if (opt_len < sizeof(struct nd_opt_hdr))
260 return NULL;
261 l = nd_opt->nd_opt_len << 3;
262 if (opt_len < l || l == 0)
263 return NULL;
264 switch (nd_opt->nd_opt_type) {
265 case ND_OPT_SOURCE_LL_ADDR:
266 case ND_OPT_TARGET_LL_ADDR:
267 case ND_OPT_MTU:
268 case ND_OPT_REDIRECT_HDR:
269 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
270 ND_PRINTK2(KERN_WARNING
271 "%s(): duplicated ND6 option found: type=%d\n",
0dc47877 272 __func__,
1da177e4
LT		 273 nd_opt->nd_opt_type);
274 } else {
275 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
276 }
277 break;
278 case ND_OPT_PREFIX_INFO:
279 ndopts->nd_opts_pi_end = nd_opt;
cfcabdcc 280 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
1da177e4
LT		 281 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
282 break;
70ceb4f5
YH		 283#ifdef CONFIG_IPV6_ROUTE_INFO
284 case ND_OPT_ROUTE_INFO:
285 ndopts->nd_opts_ri_end = nd_opt;
286 if (!ndopts->nd_opts_ri)
287 ndopts->nd_opts_ri = nd_opt;
288 break;
289#endif
1da177e4 290 default:
31910575
PY		 291 if (ndisc_is_useropt(nd_opt)) {
292 ndopts->nd_useropts_end = nd_opt;
293 if (!ndopts->nd_useropts)
294 ndopts->nd_useropts = nd_opt;
295 } else {
296 /*
297 * Unknown options must be silently ignored,
298 * to accommodate future extension to the
299 * protocol.
300 */
301 ND_PRINTK2(KERN_NOTICE
302 "%s(): ignored unsupported option; type=%d, len=%d\n",
0dc47877 303 __func__,
31910575
PY		 304 nd_opt->nd_opt_type, nd_opt->nd_opt_len);
305 }
1da177e4
LT		 306 }
307 opt_len -= l;
308 nd_opt = ((void *)nd_opt) + l;
309 }
310 return ndopts;
311}
312
313static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
314 struct net_device *dev)
315{
316 u8 *lladdr = (u8 *)(p + 1);
317 int lladdrlen = p->nd_opt_len << 3;
318 int prepad = ndisc_addr_option_pad(dev->type);
319 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
320 return NULL;
321 return (lladdr + prepad);
322}
323
324int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
325{
326 switch (dev->type) {
327 case ARPHRD_ETHER:
328 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
329 case ARPHRD_FDDI:
330 ipv6_eth_mc_map(addr, buf);
331 return 0;
332 case ARPHRD_IEEE802_TR:
333 ipv6_tr_mc_map(addr,buf);
334 return 0;
335 case ARPHRD_ARCNET:
336 ipv6_arcnet_mc_map(addr, buf);
337 return 0;
338 case ARPHRD_INFINIBAND:
a9e527e3 339 ipv6_ib_mc_map(addr, dev->broadcast, buf);
1da177e4
LT		 340 return 0;
341 default:
342 if (dir) {
343 memcpy(buf, dev->broadcast, dev->addr_len);
344 return 0;
345 }
346 }
347 return -EINVAL;
348}
349
7159039a
YH		 350EXPORT_SYMBOL(ndisc_mc_map);
351
1da177e4
LT		 352static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
353{
354 const u32 *p32 = pkey;
355 u32 addr_hash, i;
356
357 addr_hash = 0;
358 for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
359 addr_hash ^= *p32++;
360
361 return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
362}
363
364static int ndisc_constructor(struct neighbour *neigh)
365{
366 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
367 struct net_device *dev = neigh->dev;
368 struct inet6_dev *in6_dev;
369 struct neigh_parms *parms;
370 int is_multicast = ipv6_addr_is_multicast(addr);
371
372 rcu_read_lock();
373 in6_dev = in6_dev_get(dev);
374 if (in6_dev == NULL) {
375 rcu_read_unlock();
376 return -EINVAL;
377 }
378
379 parms = in6_dev->nd_parms;
380 __neigh_parms_put(neigh->parms);
381 neigh->parms = neigh_parms_clone(parms);
382 rcu_read_unlock();
383
384 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
3b04ddde 385 if (!dev->header_ops) {
1da177e4
LT		 386 neigh->nud_state = NUD_NOARP;
387 neigh->ops = &ndisc_direct_ops;
388 neigh->output = neigh->ops->queue_xmit;
389 } else {
390 if (is_multicast) {
391 neigh->nud_state = NUD_NOARP;
392 ndisc_mc_map(addr, neigh->ha, dev, 1);
393 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
394 neigh->nud_state = NUD_NOARP;
395 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
396 if (dev->flags&IFF_LOOPBACK)
397 neigh->type = RTN_LOCAL;
398 } else if (dev->flags&IFF_POINTOPOINT) {
399 neigh->nud_state = NUD_NOARP;
400 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
401 }
3b04ddde 402 if (dev->header_ops->cache)
1da177e4
LT		 403 neigh->ops = &ndisc_hh_ops;
404 else
405 neigh->ops = &ndisc_generic_ops;
406 if (neigh->nud_state&NUD_VALID)
407 neigh->output = neigh->ops->connected_output;
408 else
409 neigh->output = neigh->ops->output;
410 }
411 in6_dev_put(in6_dev);
412 return 0;
413}
414
415static int pndisc_constructor(struct pneigh_entry *n)
416{
417 struct in6_addr *addr = (struct in6_addr*)&n->key;
418 struct in6_addr maddr;
419 struct net_device *dev = n->dev;
420
421 if (dev == NULL || __in6_dev_get(dev) == NULL)
422 return -EINVAL;
423 addrconf_addr_solict_mult(addr, &maddr);
424 ipv6_dev_mc_inc(dev, &maddr);
425 return 0;
426}
427
428static void pndisc_destructor(struct pneigh_entry *n)
429{
430 struct in6_addr *addr = (struct in6_addr*)&n->key;
431 struct in6_addr maddr;
432 struct net_device *dev = n->dev;
433
434 if (dev == NULL || __in6_dev_get(dev) == NULL)
435 return;
436 addrconf_addr_solict_mult(addr, &maddr);
437 ipv6_dev_mc_dec(dev, &maddr);
438}
439
440/*
441 * Send a Neighbour Advertisement
442 */
e1ec7842
YH		 443static void __ndisc_send(struct net_device *dev,
444 struct neighbour *neigh,
9acd9f3a
YH		 445 const struct in6_addr *daddr,
446 const struct in6_addr *saddr,
447 struct icmp6hdr *icmp6h, const struct in6_addr *target,
14878f75 448 int llinfo)
1da177e4 449{
1da177e4 450 struct flowi fl;
e1ec7842 451 struct dst_entry *dst;
c346dca1 452 struct net *net = dev_net(dev);
1762f7e8 453 struct sock *sk = net->ipv6.ndisc_sk;
1ab1457c 454 struct sk_buff *skb;
e1ec7842
YH		 455 struct icmp6hdr *hdr;
456 struct inet6_dev *idev;
457 int len;
1da177e4 458 int err;
14878f75
DS		 459 u8 *opt, type;
460
461 type = icmp6h->icmp6_type;
1da177e4 462
1762f7e8 463 icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
1da177e4 464
3b00944c 465 dst = icmp6_dst_alloc(dev, neigh, daddr);
1da177e4
LT		 466 if (!dst)
467 return;
468
469 err = xfrm_lookup(&dst, &fl, NULL, 0);
e104411b 470 if (err < 0)
1da177e4 471 return;
1da177e4 472
e1ec7842
YH		 473 if (!dev->addr_len)
474 llinfo = 0;
475
476 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
477 if (llinfo)
478 len += ndisc_opt_addr_space(dev);
1da177e4 479
d54a81d3
DM		 480 skb = sock_alloc_send_skb(sk,
481 (MAX_HEADER + sizeof(struct ipv6hdr) +
f5184d26 482 len + LL_ALLOCATED_SPACE(dev)),
1da177e4 483 1, &err);
e1ec7842 484 if (!skb) {
1da177e4 485 ND_PRINTK0(KERN_ERR
e1ec7842 486 "ICMPv6 ND: %s() failed to allocate an skb.\n",
0dc47877 487 __func__);
1da177e4
LT		 488 dst_release(dst);
489 return;
490 }
491
492 skb_reserve(skb, LL_RESERVED_SPACE(dev));
e1ec7842 493 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
1da177e4 494
27a884dc 495 skb->transport_header = skb->tail;
d10ba34b 496 skb_put(skb, len);
1da177e4 497
e1ec7842
YH		 498 hdr = (struct icmp6hdr *)skb_transport_header(skb);
499 memcpy(hdr, icmp6h, sizeof(*hdr));
1da177e4 500
e1ec7842
YH		 501 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
502 if (target) {
503 ipv6_addr_copy((struct in6_addr *)opt, target);
504 opt += sizeof(*target);
505 }
1da177e4 506
e1ec7842
YH		 507 if (llinfo)
508 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
1da177e4
LT		 509 dev->addr_len, dev->type);
510
e1ec7842
YH		 511 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
512 IPPROTO_ICMPV6,
513 csum_partial((__u8 *) hdr,
514 len, 0));
1da177e4
LT		 515
516 skb->dst = dst;
e1ec7842 517
1da177e4 518 idev = in6_dev_get(dst->dev);
3bd653c8 519 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
e1ec7842 520
6e23ae2a
PM		 521 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
522 dst_output);
1da177e4 523 if (!err) {
5c5d244b 524 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 525 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 526 }
527
528 if (likely(idev != NULL))
529 in6_dev_put(idev);
1ab1457c 530}
1da177e4 531
e1ec7842 532static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 533 const struct in6_addr *daddr,
534 const struct in6_addr *solicited_addr,
535 int router, int solicited, int override, int inc_opt)
e1ec7842
YH		 536{
537 struct in6_addr tmpaddr;
538 struct inet6_ifaddr *ifp;
9acd9f3a 539 const struct in6_addr *src_addr;
e1ec7842
YH		 540 struct icmp6hdr icmp6h = {
541 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
542 };
543
544 /* for anycast or proxy, solicited_addr != src_addr */
c346dca1 545 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
e1ec7842
YH		 546 if (ifp) {
547 src_addr = solicited_addr;
548 if (ifp->flags & IFA_F_OPTIMISTIC)
549 override = 0;
550 in6_ifa_put(ifp);
551 } else {
191cd582 552 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
c346dca1 553 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
7cbca67c 554 &tmpaddr))
e1ec7842
YH		 555 return;
556 src_addr = &tmpaddr;
557 }
558
559 icmp6h.icmp6_router = router;
560 icmp6h.icmp6_solicited = solicited;
561 icmp6h.icmp6_override = override;
562
563 __ndisc_send(dev, neigh, daddr, src_addr,
564 &icmp6h, solicited_addr,
14878f75 565 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
e1ec7842
YH		 566}
567
1da177e4 568void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 569 const struct in6_addr *solicit,
570 const struct in6_addr *daddr, const struct in6_addr *saddr)
1da177e4 571{
1da177e4 572 struct in6_addr addr_buf;
e1ec7842
YH		 573 struct icmp6hdr icmp6h = {
574 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
575 };
1da177e4
LT		 576
577 if (saddr == NULL) {
95c385b4
NH		 578 if (ipv6_get_lladdr(dev, &addr_buf,
579 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
1da177e4
LT		 580 return;
581 saddr = &addr_buf;
582 }
583
e1ec7842
YH		 584 __ndisc_send(dev, neigh, daddr, saddr,
585 &icmp6h, solicit,
14878f75 586 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4
LT		 587}
588
9acd9f3a
YH		 589void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
590 const struct in6_addr *daddr)
1da177e4 591{
e1ec7842
YH		 592 struct icmp6hdr icmp6h = {
593 .icmp6_type = NDISC_ROUTER_SOLICITATION,
594 };
95c385b4 595 int send_sllao = dev->addr_len;
95c385b4
NH		 596
597#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
598 /*
599 * According to section 2.2 of RFC 4429, we must not
600 * send router solicitations with a sllao from
601 * optimistic addresses, but we may send the solicitation
602 * if we don't include the sllao. So here we check
603 * if our address is optimistic, and if so, we
bea85195 604 * suppress the inclusion of the sllao.
95c385b4
NH		 605 */
606 if (send_sllao) {
c346dca1 607 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
1cab3da6 608 dev, 1);
95c385b4
NH		 609 if (ifp) {
610 if (ifp->flags & IFA_F_OPTIMISTIC) {
ca043569 611 send_sllao = 0;
95c385b4 612 }
ca043569 613 in6_ifa_put(ifp);
95c385b4
NH		 614 } else {
615 send_sllao = 0;
616 }
617 }
618#endif
e1ec7842
YH		 619 __ndisc_send(dev, NULL, daddr, saddr,
620 &icmp6h, NULL,
14878f75 621 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4 622}
1ab1457c 623
1da177e4
LT		 624
625static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
626{
627 /*
628 * "The sender MUST return an ICMP
629 * destination unreachable"
630 */
631 dst_link_failure(skb);
632 kfree_skb(skb);
633}
634
635/* Called with locked neigh: either read or both */
636
637static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
638{
639 struct in6_addr *saddr = NULL;
640 struct in6_addr mcaddr;
641 struct net_device *dev = neigh->dev;
642 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
643 int probes = atomic_read(&neigh->probes);
644
c346dca1 645 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
0660e03f 646 saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 647
648 if ((probes -= neigh->parms->ucast_probes) < 0) {
649 if (!(neigh->nud_state & NUD_VALID)) {
650 ND_PRINTK1(KERN_DEBUG
651 "%s(): trying to ucast probe in NUD_INVALID: "
46b86a2d 652 NIP6_FMT "\n",
0dc47877 653 __func__,
1da177e4
LT		 654 NIP6(*target));
655 }
656 ndisc_send_ns(dev, neigh, target, target, saddr);
657 } else if ((probes -= neigh->parms->app_probes) < 0) {
658#ifdef CONFIG_ARPD
659 neigh_app_ns(neigh);
660#endif
661 } else {
662 addrconf_addr_solict_mult(target, &mcaddr);
663 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
664 }
665}
666
0736ffc0
YH		 667static int pndisc_is_router(const void *pkey,
668 struct net_device *dev)
fa86d322
PE		 669{
670 struct pneigh_entry *n;
0736ffc0 671 int ret = -1;
fa86d322
PE		 672
673 read_lock_bh(&nd_tbl.lock);
0736ffc0
YH		 674 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
675 if (n)
676 ret = !!(n->flags & NTF_ROUTER);
fa86d322
PE		 677 read_unlock_bh(&nd_tbl.lock);
678
0736ffc0 679 return ret;
fa86d322
PE		 680}
681
1da177e4
LT		 682static void ndisc_recv_ns(struct sk_buff *skb)
683{
9c70220b 684 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
0660e03f
ACM		 685 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
686 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 687 u8 *lladdr = NULL;
27a884dc
ACM		 688 u32 ndoptlen = skb->tail - (skb->transport_header +
689 offsetof(struct nd_msg, opt));
1da177e4
LT		 690 struct ndisc_options ndopts;
691 struct net_device *dev = skb->dev;
692 struct inet6_ifaddr *ifp;
693 struct inet6_dev *idev = NULL;
694 struct neighbour *neigh;
695 int dad = ipv6_addr_any(saddr);
696 int inc;
0736ffc0 697 int is_router = -1;
1da177e4
LT		 698
699 if (ipv6_addr_is_multicast(&msg->target)) {
1ab1457c 700 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 701 "ICMPv6 NS: multicast target address");
702 return;
703 }
704
705 /*
706 * RFC2461 7.1.1:
707 * DAD has to be destined for solicited node multicast address.
708 */
709 if (dad &&
710 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
711 daddr->s6_addr32[1] == htonl(0x00000000) &&
712 daddr->s6_addr32[2] == htonl(0x00000001) &&
713 daddr->s6_addr [12] == 0xff )) {
714 ND_PRINTK2(KERN_WARNING
715 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
716 return;
717 }
718
719 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
1ab1457c 720 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 721 "ICMPv6 NS: invalid ND options\n");
722 return;
723 }
724
725 if (ndopts.nd_opts_src_lladdr) {
726 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
727 if (!lladdr) {
728 ND_PRINTK2(KERN_WARNING
729 "ICMPv6 NS: invalid link-layer address length\n");
730 return;
731 }
732
733 /* RFC2461 7.1.1:
1ab1457c
YH		 734 * If the IP source address is the unspecified address,
735 * there MUST NOT be source link-layer address option
1da177e4
LT		 736 * in the message.
737 */
738 if (dad) {
1ab1457c 739 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 740 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
741 return;
742 }
743 }
744
745 inc = ipv6_addr_is_multicast(daddr);
746
c346dca1 747 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 748 if (ifp) {
95c385b4
NH		 749
750 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
751 if (dad) {
752 if (dev->type == ARPHRD_IEEE802_TR) {
98e399f8
ACM		 753 const unsigned char *sadr;
754 sadr = skb_mac_header(skb);
95c385b4
NH		 755 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
756 sadr[9] == dev->dev_addr[1] &&
757 sadr[10] == dev->dev_addr[2] &&
758 sadr[11] == dev->dev_addr[3] &&
759 sadr[12] == dev->dev_addr[4] &&
760 sadr[13] == dev->dev_addr[5]) {
761 /* looped-back to us */
762 goto out;
763 }
764 }
765
766 /*
767 * We are colliding with another node
768 * who is doing DAD
769 * so fail our DAD process
770 */
771 addrconf_dad_failure(ifp);
9e3be4b3 772 return;
95c385b4
NH		 773 } else {
774 /*
775 * This is not a dad solicitation.
776 * If we are an optimistic node,
777 * we should respond.
778 * Otherwise, we should ignore it.
779 */
780 if (!(ifp->flags & IFA_F_OPTIMISTIC))
1da177e4 781 goto out;
1da177e4 782 }
1da177e4
LT		 783 }
784
785 idev = ifp->idev;
786 } else {
53b7997f
YH		 787 struct net *net = dev_net(dev);
788
1da177e4
LT		 789 idev = in6_dev_get(dev);
790 if (!idev) {
791 /* XXX: count this drop? */
792 return;
793 }
794
53b7997f 795 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
1ab1457c 796 (idev->cnf.forwarding &&
53b7997f 797 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
0736ffc0 798 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
a61bbcf2 799 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
1da177e4
LT		 800 skb->pkt_type != PACKET_HOST &&
801 inc != 0 &&
802 idev->nd_parms->proxy_delay != 0) {
803 /*
804 * for anycast or proxy,
1ab1457c
YH		 805 * sender should delay its response
806 * by a random time between 0 and
1da177e4
LT		 807 * MAX_ANYCAST_DELAY_TIME seconds.
808 * (RFC2461) -- yoshfuji
809 */
810 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
811 if (n)
812 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
813 goto out;
814 }
815 } else
816 goto out;
817 }
818
0736ffc0
YH		 819 if (is_router < 0)
820 is_router = !!idev->cnf.forwarding;
62dd9318 821
1da177e4 822 if (dad) {
f3ee4010 823 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
62dd9318 824 is_router, 0, (ifp != NULL), 1);
1da177e4
LT		 825 goto out;
826 }
827
828 if (inc)
829 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
830 else
831 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
832
1ab1457c 833 /*
1da177e4
LT		 834 * update / create cache entry
835 * for the source address
836 */
837 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
838 !inc || lladdr || !dev->addr_len);
839 if (neigh)
1ab1457c 840 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 841 NEIGH_UPDATE_F_WEAK_OVERRIDE|
842 NEIGH_UPDATE_F_OVERRIDE);
3b04ddde 843 if (neigh || !dev->header_ops) {
1da177e4 844 ndisc_send_na(dev, neigh, saddr, &msg->target,
62dd9318 845 is_router,
1da177e4
LT		 846 1, (ifp != NULL && inc), inc);
847 if (neigh)
848 neigh_release(neigh);
849 }
850
851out:
852 if (ifp)
853 in6_ifa_put(ifp);
854 else
855 in6_dev_put(idev);
856
857 return;
858}
859
860static void ndisc_recv_na(struct sk_buff *skb)
861{
9c70220b 862 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
0660e03f
ACM		 863 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
864 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 865 u8 *lladdr = NULL;
27a884dc
ACM		 866 u32 ndoptlen = skb->tail - (skb->transport_header +
867 offsetof(struct nd_msg, opt));
1da177e4
LT		 868 struct ndisc_options ndopts;
869 struct net_device *dev = skb->dev;
870 struct inet6_ifaddr *ifp;
871 struct neighbour *neigh;
872
873 if (skb->len < sizeof(struct nd_msg)) {
874 ND_PRINTK2(KERN_WARNING
875 "ICMPv6 NA: packet too short\n");
876 return;
877 }
878
879 if (ipv6_addr_is_multicast(&msg->target)) {
880 ND_PRINTK2(KERN_WARNING
881 "ICMPv6 NA: target address is multicast.\n");
882 return;
883 }
884
885 if (ipv6_addr_is_multicast(daddr) &&
886 msg->icmph.icmp6_solicited) {
887 ND_PRINTK2(KERN_WARNING
888 "ICMPv6 NA: solicited NA is multicasted.\n");
889 return;
890 }
1ab1457c 891
1da177e4
LT		 892 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
893 ND_PRINTK2(KERN_WARNING
894 "ICMPv6 NS: invalid ND option\n");
895 return;
896 }
897 if (ndopts.nd_opts_tgt_lladdr) {
898 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
899 if (!lladdr) {
900 ND_PRINTK2(KERN_WARNING
901 "ICMPv6 NA: invalid link-layer address length\n");
902 return;
903 }
904 }
c346dca1 905 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 906 if (ifp) {
1da177e4
LT		 907 if (ifp->flags & IFA_F_TENTATIVE) {
908 addrconf_dad_failure(ifp);
909 return;
910 }
911 /* What should we make now? The advertisement
912 is invalid, but ndisc specs say nothing
913 about it. It could be misconfiguration, or
914 an smart proxy agent tries to help us :-)
915 */
916 ND_PRINTK1(KERN_WARNING
917 "ICMPv6 NA: someone advertises our address on %s!\n",
918 ifp->idev->dev->name);
919 in6_ifa_put(ifp);
920 return;
921 }
922 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
923
924 if (neigh) {
925 u8 old_flags = neigh->flags;
53b7997f 926 struct net *net = dev_net(dev);
1da177e4
LT		 927
928 if (neigh->nud_state & NUD_FAILED)
929 goto out;
930
5f3e6e9e
VN		 931 /*
932 * Don't update the neighbor cache entry on a proxy NA from
933 * ourselves because either the proxied node is off link or it
934 * has already sent a NA to us.
935 */
936 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
53b7997f
YH		 937 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
938 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
fbea49e1 939 /* XXX: idev->cnf.prixy_ndp */
5f3e6e9e 940 goto out;
fbea49e1 941 }
5f3e6e9e 942
1da177e4
LT		 943 neigh_update(neigh, lladdr,
944 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
945 NEIGH_UPDATE_F_WEAK_OVERRIDE|
946 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
947 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
948 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
949
950 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
951 /*
952 * Change: router to host
953 */
954 struct rt6_info *rt;
955 rt = rt6_get_dflt_router(saddr, dev);
956 if (rt)
e0a1ad73 957 ip6_del_rt(rt);
1da177e4
LT		 958 }
959
960out:
961 neigh_release(neigh);
962 }
963}
964
965static void ndisc_recv_rs(struct sk_buff *skb)
966{
9c70220b 967 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1da177e4
LT		 968 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
969 struct neighbour *neigh;
970 struct inet6_dev *idev;
0660e03f 971 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 972 struct ndisc_options ndopts;
973 u8 *lladdr = NULL;
974
975 if (skb->len < sizeof(*rs_msg))
976 return;
977
978 idev = in6_dev_get(skb->dev);
979 if (!idev) {
980 if (net_ratelimit())
981 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
982 return;
983 }
984
985 /* Don't accept RS if we're not in router mode */
986 if (!idev->cnf.forwarding)
987 goto out;
988
989 /*
990 * Don't update NCE if src = ::;
991 * this implies that the source node has no ip address assigned yet.
992 */
993 if (ipv6_addr_any(saddr))
994 goto out;
995
996 /* Parse ND options */
997 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
998 if (net_ratelimit())
999 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1000 goto out;
1001 }
1002
1003 if (ndopts.nd_opts_src_lladdr) {
1004 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1005 skb->dev);
1006 if (!lladdr)
1007 goto out;
1008 }
1009
1010 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1011 if (neigh) {
1012 neigh_update(neigh, lladdr, NUD_STALE,
1013 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1014 NEIGH_UPDATE_F_OVERRIDE|
1015 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1016 neigh_release(neigh);
1017 }
1018out:
1019 in6_dev_put(idev);
1020}
1021
31910575
PY		 1022static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1023{
1024 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1025 struct sk_buff *skb;
1026 struct nlmsghdr *nlh;
1027 struct nduseroptmsg *ndmsg;
c346dca1 1028 struct net *net = dev_net(ra->dev);
31910575
PY		 1029 int err;
1030 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1031 + (opt->nd_opt_len << 3));
1032 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1033
1034 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1035 if (skb == NULL) {
1036 err = -ENOBUFS;
1037 goto errout;
1038 }
1039
1040 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1041 if (nlh == NULL) {
1042 goto nla_put_failure;
1043 }
1044
1045 ndmsg = nlmsg_data(nlh);
1046 ndmsg->nduseropt_family = AF_INET6;
dbb2ed24 1047 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
31910575
PY		 1048 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1049 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1050 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1051
1052 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1053
1054 NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1055 &ipv6_hdr(ra)->saddr);
1056 nlmsg_end(skb, nlh);
1057
a18bc695 1058 err = rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL,
97c53cac 1059 GFP_ATOMIC);
31910575
PY		 1060 if (err < 0)
1061 goto errout;
1062
1063 return;
1064
1065nla_put_failure:
1066 nlmsg_free(skb);
1067 err = -EMSGSIZE;
1068errout:
a18bc695 1069 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
31910575
PY		 1070}
1071
1da177e4
LT		 1072static void ndisc_router_discovery(struct sk_buff *skb)
1073{
9c70220b 1074 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1da177e4
LT		 1075 struct neighbour *neigh = NULL;
1076 struct inet6_dev *in6_dev;
65f5c7c1 1077 struct rt6_info *rt = NULL;
1da177e4
LT		 1078 int lifetime;
1079 struct ndisc_options ndopts;
1080 int optlen;
ebacaaa0 1081 unsigned int pref = 0;
1da177e4
LT		 1082
1083 __u8 * opt = (__u8 *)(ra_msg + 1);
1084
27a884dc 1085 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1da177e4 1086
0660e03f 1087 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1088 ND_PRINTK2(KERN_WARNING
1089 "ICMPv6 RA: source address is not link-local.\n");
1090 return;
1091 }
1092 if (optlen < 0) {
1ab1457c 1093 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1094 "ICMPv6 RA: packet too short\n");
1095 return;
1096 }
1097
de357cc0 1098#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1099 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1100 ND_PRINTK2(KERN_WARNING
1101 "ICMPv6 RA: from host or unauthorized router\n");
1102 return;
1103 }
de357cc0 1104#endif
fadf6bf0 1105
1da177e4
LT		 1106 /*
1107 * set the RA_RECV flag in the interface
1108 */
1109
1110 in6_dev = in6_dev_get(skb->dev);
1111 if (in6_dev == NULL) {
1112 ND_PRINTK0(KERN_ERR
1113 "ICMPv6 RA: can't find inet6 device for %s.\n",
1114 skb->dev->name);
1115 return;
1116 }
1117 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
1118 in6_dev_put(in6_dev);
1119 return;
1120 }
1121
1122 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1123 in6_dev_put(in6_dev);
1124 ND_PRINTK2(KERN_WARNING
1125 "ICMP6 RA: invalid ND options\n");
1126 return;
1127 }
1128
de357cc0 1129#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1130 /* skip link-specific parameters from interior routers */
1131 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1132 goto skip_linkparms;
de357cc0 1133#endif
fadf6bf0 1134
1da177e4
LT		 1135 if (in6_dev->if_flags & IF_RS_SENT) {
1136 /*
1137 * flag that an RA was received after an RS was sent
1138 * out on this interface.
1139 */
1140 in6_dev->if_flags |= IF_RA_RCVD;
1141 }
1142
1143 /*
1144 * Remember the managed/otherconf flags from most recently
1145 * received RA message (RFC 2462) -- yoshfuji
1146 */
1147 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1148 IF_RA_OTHERCONF)) |
1149 (ra_msg->icmph.icmp6_addrconf_managed ?
1150 IF_RA_MANAGED : 0) |
1151 (ra_msg->icmph.icmp6_addrconf_other ?
1152 IF_RA_OTHERCONF : 0);
1153
65f5c7c1
YH		 1154 if (!in6_dev->cnf.accept_ra_defrtr)
1155 goto skip_defrtr;
1156
1da177e4
LT		 1157 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1158
ebacaaa0
YH		 1159#ifdef CONFIG_IPV6_ROUTER_PREF
1160 pref = ra_msg->icmph.icmp6_router_pref;
1161 /* 10b is handled as if it were 00b (medium) */
930d6ff2 1162 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
6d5b78cd 1163 !in6_dev->cnf.accept_ra_rtr_pref)
ebacaaa0
YH		 1164 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1165#endif
1166
0660e03f 1167 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1da177e4
LT		 1168
1169 if (rt)
1170 neigh = rt->rt6i_nexthop;
1171
1172 if (rt && lifetime == 0) {
1173 neigh_clone(neigh);
e0a1ad73 1174 ip6_del_rt(rt);
1da177e4
LT		 1175 rt = NULL;
1176 }
1177
1178 if (rt == NULL && lifetime) {
1179 ND_PRINTK3(KERN_DEBUG
1180 "ICMPv6 RA: adding default router.\n");
1181
0660e03f 1182 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1da177e4
LT		 1183 if (rt == NULL) {
1184 ND_PRINTK0(KERN_ERR
1185 "ICMPv6 RA: %s() failed to add default route.\n",
0dc47877 1186 __func__);
1da177e4
LT		 1187 in6_dev_put(in6_dev);
1188 return;
1189 }
1190
1191 neigh = rt->rt6i_nexthop;
1192 if (neigh == NULL) {
1193 ND_PRINTK0(KERN_ERR
1194 "ICMPv6 RA: %s() got default router without neighbour.\n",
0dc47877 1195 __func__);
1da177e4
LT		 1196 dst_release(&rt->u.dst);
1197 in6_dev_put(in6_dev);
1198 return;
1199 }
1200 neigh->flags |= NTF_ROUTER;
ebacaaa0
YH		 1201 } else if (rt) {
1202 rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1da177e4
LT		 1203 }
1204
1205 if (rt)
1206 rt->rt6i_expires = jiffies + (HZ * lifetime);
1207
1208 if (ra_msg->icmph.icmp6_hop_limit) {
1209 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1210 if (rt)
1211 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
1212 }
1213
65f5c7c1
YH		 1214skip_defrtr:
1215
1da177e4
LT		 1216 /*
1217 * Update Reachable Time and Retrans Timer
1218 */
1219
1220 if (in6_dev->nd_parms) {
1221 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1222
1223 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1224 rtime = (rtime*HZ)/1000;
1225 if (rtime < HZ/10)
1226 rtime = HZ/10;
1227 in6_dev->nd_parms->retrans_time = rtime;
1228 in6_dev->tstamp = jiffies;
1229 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1230 }
1231
1232 rtime = ntohl(ra_msg->reachable_time);
1233 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1234 rtime = (rtime*HZ)/1000;
1235
1236 if (rtime < HZ/10)
1237 rtime = HZ/10;
1238
1239 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1240 in6_dev->nd_parms->base_reachable_time = rtime;
1241 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1242 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1243 in6_dev->tstamp = jiffies;
1244 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1245 }
1246 }
1247 }
1248
de357cc0 1249#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0 1250skip_linkparms:
de357cc0 1251#endif
fadf6bf0 1252
1da177e4
LT		 1253 /*
1254 * Process options.
1255 */
1256
1257 if (!neigh)
0660e03f 1258 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1259 skb->dev, 1);
1260 if (neigh) {
1261 u8 *lladdr = NULL;
1262 if (ndopts.nd_opts_src_lladdr) {
1263 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1264 skb->dev);
1265 if (!lladdr) {
1266 ND_PRINTK2(KERN_WARNING
1267 "ICMPv6 RA: invalid link-layer address length\n");
1268 goto out;
1269 }
1270 }
1271 neigh_update(neigh, lladdr, NUD_STALE,
1272 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1273 NEIGH_UPDATE_F_OVERRIDE|
1274 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1275 NEIGH_UPDATE_F_ISROUTER);
1276 }
1277
70ceb4f5 1278#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 1279 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
70ceb4f5
YH		 1280 struct nd_opt_hdr *p;
1281 for (p = ndopts.nd_opts_ri;
1282 p;
1283 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
6294e000
YH		 1284 struct route_info *ri = (struct route_info *)p;
1285#ifdef CONFIG_IPV6_NDISC_NODETYPE
1286 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1287 ri->prefix_len == 0)
1288 continue;
1289#endif
1290 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
09c884d4 1291 continue;
70ceb4f5 1292 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
0660e03f 1293 &ipv6_hdr(skb)->saddr);
70ceb4f5
YH		 1294 }
1295 }
1296#endif
1297
de357cc0 1298#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1299 /* skip link-specific ndopts from interior routers */
1300 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1301 goto out;
de357cc0 1302#endif
fadf6bf0 1303
c4fd30eb 1304 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1da177e4
LT		 1305 struct nd_opt_hdr *p;
1306 for (p = ndopts.nd_opts_pi;
1307 p;
1308 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1309 addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
1310 }
1311 }
1312
1313 if (ndopts.nd_opts_mtu) {
e69a4adc 1314 __be32 n;
1da177e4
LT		 1315 u32 mtu;
1316
e69a4adc
AV		 1317 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1318 mtu = ntohl(n);
1da177e4
LT		 1319
1320 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1321 ND_PRINTK2(KERN_WARNING
1322 "ICMPv6 RA: invalid mtu: %d\n",
1323 mtu);
1324 } else if (in6_dev->cnf.mtu6 != mtu) {
1325 in6_dev->cnf.mtu6 = mtu;
1326
1327 if (rt)
1328 rt->u.dst.metrics[RTAX_MTU-1] = mtu;
1329
1330 rt6_mtu_change(skb->dev, mtu);
1331 }
1332 }
1ab1457c 1333
31910575 1334 if (ndopts.nd_useropts) {
61cf46ad
YH		 1335 struct nd_opt_hdr *p;
1336 for (p = ndopts.nd_useropts;
1337 p;
1338 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1339 ndisc_ra_useropt(skb, p);
31910575
PY		 1340 }
1341 }
1342
1da177e4
LT		 1343 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1344 ND_PRINTK2(KERN_WARNING
1345 "ICMPv6 RA: invalid RA options");
1346 }
1347out:
1348 if (rt)
1349 dst_release(&rt->u.dst);
1350 else if (neigh)
1351 neigh_release(neigh);
1352 in6_dev_put(in6_dev);
1353}
1354
1355static void ndisc_redirect_rcv(struct sk_buff *skb)
1356{
1357 struct inet6_dev *in6_dev;
1358 struct icmp6hdr *icmph;
1359 struct in6_addr *dest;
1360 struct in6_addr *target; /* new first hop to destination */
1361 struct neighbour *neigh;
1362 int on_link = 0;
1363 struct ndisc_options ndopts;
1364 int optlen;
1365 u8 *lladdr = NULL;
1366
de357cc0 1367#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1368 switch (skb->ndisc_nodetype) {
1369 case NDISC_NODETYPE_HOST:
1370 case NDISC_NODETYPE_NODEFAULT:
1371 ND_PRINTK2(KERN_WARNING
1372 "ICMPv6 Redirect: from host or unauthorized router\n");
1373 return;
1374 }
de357cc0 1375#endif
fadf6bf0 1376
0660e03f 1377 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1378 ND_PRINTK2(KERN_WARNING
1379 "ICMPv6 Redirect: source address is not link-local.\n");
1380 return;
1381 }
1382
27a884dc 1383 optlen = skb->tail - skb->transport_header;
1da177e4
LT		 1384 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1385
1386 if (optlen < 0) {
1387 ND_PRINTK2(KERN_WARNING
1388 "ICMPv6 Redirect: packet too short\n");
1389 return;
1390 }
1391
cc70ab26 1392 icmph = icmp6_hdr(skb);
1da177e4
LT		 1393 target = (struct in6_addr *) (icmph + 1);
1394 dest = target + 1;
1395
1396 if (ipv6_addr_is_multicast(dest)) {
1397 ND_PRINTK2(KERN_WARNING
1398 "ICMPv6 Redirect: destination address is multicast.\n");
1399 return;
1400 }
1401
1402 if (ipv6_addr_equal(dest, target)) {
1403 on_link = 1;
bf0b48df
BH		 1404 } else if (ipv6_addr_type(target) !=
1405 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1ab1457c 1406 ND_PRINTK2(KERN_WARNING
bf0b48df 1407 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1da177e4
LT		 1408 return;
1409 }
1410
1411 in6_dev = in6_dev_get(skb->dev);
1412 if (!in6_dev)
1413 return;
1414 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
1415 in6_dev_put(in6_dev);
1416 return;
1417 }
1418
1ab1457c 1419 /* RFC2461 8.1:
1da177e4
LT		 1420 * The IP source address of the Redirect MUST be the same as the current
1421 * first-hop router for the specified ICMP Destination Address.
1422 */
1ab1457c 1423
1da177e4
LT		 1424 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1425 ND_PRINTK2(KERN_WARNING
1426 "ICMPv6 Redirect: invalid ND options\n");
1427 in6_dev_put(in6_dev);
1428 return;
1429 }
1430 if (ndopts.nd_opts_tgt_lladdr) {
1431 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1432 skb->dev);
1433 if (!lladdr) {
1434 ND_PRINTK2(KERN_WARNING
1435 "ICMPv6 Redirect: invalid link-layer address length\n");
1436 in6_dev_put(in6_dev);
1437 return;
1438 }
1439 }
1440
1441 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1442 if (neigh) {
0660e03f
ACM		 1443 rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
1444 &ipv6_hdr(skb)->saddr, neigh, lladdr,
1da177e4
LT		 1445 on_link);
1446 neigh_release(neigh);
1447 }
1448 in6_dev_put(in6_dev);
1449}
1450
1451void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
9acd9f3a 1452 const struct in6_addr *target)
1da177e4 1453{
1762f7e8 1454 struct net_device *dev = skb->dev;
c346dca1 1455 struct net *net = dev_net(dev);
1762f7e8 1456 struct sock *sk = net->ipv6.ndisc_sk;
1da177e4
LT		 1457 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1458 struct sk_buff *buff;
1459 struct icmp6hdr *icmph;
1460 struct in6_addr saddr_buf;
1461 struct in6_addr *addrp;
1da177e4
LT		 1462 struct rt6_info *rt;
1463 struct dst_entry *dst;
1464 struct inet6_dev *idev;
1465 struct flowi fl;
1466 u8 *opt;
1467 int rd_len;
1468 int err;
1da177e4
LT		 1469 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1470
95c385b4 1471 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1da177e4
LT		 1472 ND_PRINTK2(KERN_WARNING
1473 "ICMPv6 Redirect: no link-local address on %s\n",
1474 dev->name);
1ab1457c
YH		 1475 return;
1476 }
1da177e4 1477
0660e03f 1478 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
bf0b48df 1479 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
29556526 1480 ND_PRINTK2(KERN_WARNING
bf0b48df 1481 "ICMPv6 Redirect: target address is not link-local unicast.\n");
29556526
LY		 1482 return;
1483 }
1484
1762f7e8 1485 icmpv6_flow_init(sk, &fl, NDISC_REDIRECT,
95e41e93 1486 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1da177e4 1487
1762f7e8 1488 dst = ip6_route_output(net, NULL, &fl);
1da177e4
LT		 1489 if (dst == NULL)
1490 return;
1491
1492 err = xfrm_lookup(&dst, &fl, NULL, 0);
e104411b 1493 if (err)
1da177e4 1494 return;
1da177e4
LT		 1495
1496 rt = (struct rt6_info *) dst;
1497
1498 if (rt->rt6i_flags & RTF_GATEWAY) {
1499 ND_PRINTK2(KERN_WARNING
1500 "ICMPv6 Redirect: destination is not a neighbour.\n");
1501 dst_release(dst);
1502 return;
1503 }
1504 if (!xrlim_allow(dst, 1*HZ)) {
1505 dst_release(dst);
1506 return;
1507 }
1508
1509 if (dev->addr_len) {
1510 read_lock_bh(&neigh->lock);
1511 if (neigh->nud_state & NUD_VALID) {
1512 memcpy(ha_buf, neigh->ha, dev->addr_len);
1513 read_unlock_bh(&neigh->lock);
1514 ha = ha_buf;
1515 len += ndisc_opt_addr_space(dev);
1516 } else
1517 read_unlock_bh(&neigh->lock);
1518 }
1519
1520 rd_len = min_t(unsigned int,
1521 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1522 rd_len &= ~0x7;
1523 len += rd_len;
1524
d54a81d3
DM		 1525 buff = sock_alloc_send_skb(sk,
1526 (MAX_HEADER + sizeof(struct ipv6hdr) +
f5184d26 1527 len + LL_ALLOCATED_SPACE(dev)),
1da177e4
LT		 1528 1, &err);
1529 if (buff == NULL) {
1530 ND_PRINTK0(KERN_ERR
1531 "ICMPv6 Redirect: %s() failed to allocate an skb.\n",
0dc47877 1532 __func__);
1da177e4
LT		 1533 dst_release(dst);
1534 return;
1535 }
1536
1da177e4 1537 skb_reserve(buff, LL_RESERVED_SPACE(dev));
0660e03f 1538 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1539 IPPROTO_ICMPV6, len);
1540
27a884dc 1541 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
d10ba34b
ACM		 1542 skb_put(buff, len);
1543 icmph = icmp6_hdr(buff);
1da177e4
LT		 1544
1545 memset(icmph, 0, sizeof(struct icmp6hdr));
1546 icmph->icmp6_type = NDISC_REDIRECT;
1547
1548 /*
1549 * copy target and destination addresses
1550 */
1551
1552 addrp = (struct in6_addr *)(icmph + 1);
1553 ipv6_addr_copy(addrp, target);
1554 addrp++;
0660e03f 1555 ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 1556
1557 opt = (u8*) (addrp + 1);
1558
1559 /*
1560 * include target_address option
1561 */
1562
1563 if (ha)
1564 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1565 dev->addr_len, dev->type);
1566
1567 /*
1568 * build redirect option and copy skb over to the new packet.
1569 */
1570
1ab1457c 1571 memset(opt, 0, 8);
1da177e4
LT		 1572 *(opt++) = ND_OPT_REDIRECT_HDR;
1573 *(opt++) = (rd_len >> 3);
1574 opt += 6;
1575
0660e03f 1576 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1da177e4 1577
0660e03f 1578 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1579 len, IPPROTO_ICMPV6,
1580 csum_partial((u8 *) icmph, len, 0));
1581
1582 buff->dst = dst;
1583 idev = in6_dev_get(dst->dev);
3bd653c8 1584 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
6e23ae2a
PM		 1585 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
1586 dst_output);
1da177e4 1587 if (!err) {
5c5d244b 1588 ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT);
a862f6a6 1589 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 1590 }
1591
1592 if (likely(idev != NULL))
1593 in6_dev_put(idev);
1594}
1595
1596static void pndisc_redo(struct sk_buff *skb)
1597{
140e26fc 1598 ndisc_recv_ns(skb);
1da177e4
LT		 1599 kfree_skb(skb);
1600}
1601
1602int ndisc_rcv(struct sk_buff *skb)
1603{
1604 struct nd_msg *msg;
1605
1606 if (!pskb_may_pull(skb, skb->len))
1607 return 0;
1608
9c70220b 1609 msg = (struct nd_msg *)skb_transport_header(skb);
1da177e4 1610
9c70220b 1611 __skb_push(skb, skb->data - skb_transport_header(skb));
1da177e4 1612
0660e03f 1613 if (ipv6_hdr(skb)->hop_limit != 255) {
1da177e4
LT		 1614 ND_PRINTK2(KERN_WARNING
1615 "ICMPv6 NDISC: invalid hop-limit: %d\n",
0660e03f 1616 ipv6_hdr(skb)->hop_limit);
1da177e4
LT		 1617 return 0;
1618 }
1619
1620 if (msg->icmph.icmp6_code != 0) {
1ab1457c 1621 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1622 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1623 msg->icmph.icmp6_code);
1624 return 0;
1625 }
1626
a61bbcf2
PM		 1627 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1628
1da177e4
LT		 1629 switch (msg->icmph.icmp6_type) {
1630 case NDISC_NEIGHBOUR_SOLICITATION:
1631 ndisc_recv_ns(skb);
1632 break;
1633
1634 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1635 ndisc_recv_na(skb);
1636 break;
1637
1638 case NDISC_ROUTER_SOLICITATION:
1639 ndisc_recv_rs(skb);
1640 break;
1641
1642 case NDISC_ROUTER_ADVERTISEMENT:
1643 ndisc_router_discovery(skb);
1644 break;
1645
1646 case NDISC_REDIRECT:
1647 ndisc_redirect_rcv(skb);
1648 break;
3ff50b79 1649 }
1da177e4
LT		 1650
1651 return 0;
1652}
1653
1654static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1655{
1656 struct net_device *dev = ptr;
c346dca1 1657 struct net *net = dev_net(dev);
1da177e4
LT		 1658
1659 switch (event) {
1660 case NETDEV_CHANGEADDR:
1661 neigh_changeaddr(&nd_tbl, dev);
5b7c931d 1662 fib6_run_gc(~0UL, net);
1da177e4
LT		 1663 break;
1664 case NETDEV_DOWN:
1665 neigh_ifdown(&nd_tbl, dev);
5b7c931d 1666 fib6_run_gc(~0UL, net);
1da177e4
LT		 1667 break;
1668 default:
1669 break;
1670 }
1671
1672 return NOTIFY_DONE;
1673}
1674
1675static struct notifier_block ndisc_netdev_notifier = {
1676 .notifier_call = ndisc_netdev_event,
1677};
1678
1679#ifdef CONFIG_SYSCTL
1680static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1681 const char *func, const char *dev_name)
1682{
1683 static char warncomm[TASK_COMM_LEN];
1684 static int warned;
1685 if (strcmp(warncomm, current->comm) && warned < 5) {
1686 strcpy(warncomm, current->comm);
1687 printk(KERN_WARNING
1688 "process `%s' is using deprecated sysctl (%s) "
1689 "net.ipv6.neigh.%s.%s; "
1690 "Use net.ipv6.neigh.%s.%s_ms "
1691 "instead.\n",
1692 warncomm, func,
1693 dev_name, ctl->procname,
1694 dev_name, ctl->procname);
1695 warned++;
1696 }
1697}
1698
1699int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
1700{
1701 struct net_device *dev = ctl->extra1;
1702 struct inet6_dev *idev;
1703 int ret;
1704
d12af679
EB		 1705 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1706 (strcmp(ctl->procname, "base_reachable_time") == 0))
1da177e4
LT		 1707 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1708
d12af679 1709 if (strcmp(ctl->procname, "retrans_time") == 0)
1da177e4 1710 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
d12af679
EB		 1711
1712 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1da177e4
LT		 1713 ret = proc_dointvec_jiffies(ctl, write,
1714 filp, buffer, lenp, ppos);
d12af679
EB		 1715
1716 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
ad02ac14 1717 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1da177e4
LT		 1718 ret = proc_dointvec_ms_jiffies(ctl, write,
1719 filp, buffer, lenp, ppos);
d12af679 1720 else
1da177e4 1721 ret = -1;
1da177e4
LT		 1722
1723 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
d12af679 1724 if (ctl->data == &idev->nd_parms->base_reachable_time)
1da177e4
LT		 1725 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1726 idev->tstamp = jiffies;
1727 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1728 in6_dev_put(idev);
1729 }
1730 return ret;
1731}
1732
0686caa3
YH		 1733int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
1734 int nlen, void __user *oldval,
1735 size_t __user *oldlenp,
1736 void __user *newval, size_t newlen)
1da177e4
LT		 1737{
1738 struct net_device *dev = ctl->extra1;
1739 struct inet6_dev *idev;
1740 int ret;
1741
1742 if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
1743 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
1744 ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default");
1745
1746 switch (ctl->ctl_name) {
1747 case NET_NEIGH_REACHABLE_TIME:
1748 ret = sysctl_jiffies(ctl, name, nlen,
1f29bcd7 1749 oldval, oldlenp, newval, newlen);
1da177e4
LT		 1750 break;
1751 case NET_NEIGH_RETRANS_TIME_MS:
1752 case NET_NEIGH_REACHABLE_TIME_MS:
1753 ret = sysctl_ms_jiffies(ctl, name, nlen,
1f29bcd7 1754 oldval, oldlenp, newval, newlen);
1da177e4
LT		 1755 break;
1756 default:
1757 ret = 0;
1758 }
1759
1760 if (newval && newlen && ret > 0 &&
1761 dev && (idev = in6_dev_get(dev)) != NULL) {
1762 if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
1763 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
1764 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1765 idev->tstamp = jiffies;
1766 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1767 in6_dev_put(idev);
1768 }
1769
1770 return ret;
1771}
1772
1773#endif
1774
1762f7e8 1775static int ndisc_net_init(struct net *net)
1da177e4
LT		 1776{
1777 struct ipv6_pinfo *np;
1778 struct sock *sk;
1ab1457c 1779 int err;
1da177e4 1780
1ed8516f
DL		 1781 err = inet_ctl_sock_create(&sk, PF_INET6,
1782 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 1783 if (err < 0) {
1784 ND_PRINTK0(KERN_ERR
1ab1457c 1785 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1da177e4 1786 err);
1da177e4
LT		 1787 return err;
1788 }
1789
1ed8516f 1790 net->ipv6.ndisc_sk = sk;
1762f7e8 1791
1da177e4 1792 np = inet6_sk(sk);
1da177e4
LT		 1793 np->hop_limit = 255;
1794 /* Do not loopback ndisc messages */
1795 np->mc_loop = 0;
1da177e4 1796
1762f7e8
DL		 1797 return 0;
1798}
1799
1800static void ndisc_net_exit(struct net *net)
1801{
1ed8516f 1802 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1762f7e8
DL		 1803}
1804
1805static struct pernet_operations ndisc_net_ops = {
1806 .init = ndisc_net_init,
1807 .exit = ndisc_net_exit,
1808};
1809
1810int __init ndisc_init(void)
1811{
1812 int err;
1813
1814 err = register_pernet_subsys(&ndisc_net_ops);
1815 if (err)
1816 return err;
1ab1457c
YH		 1817 /*
1818 * Initialize the neighbour table
1819 */
1da177e4
LT		 1820 neigh_table_init(&nd_tbl);
1821
1822#ifdef CONFIG_SYSCTL
1762f7e8
DL		 1823 err = neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6,
1824 NET_IPV6_NEIGH, "ipv6",
1825 &ndisc_ifinfo_sysctl_change,
1826 &ndisc_ifinfo_sysctl_strategy);
1827 if (err)
1828 goto out_unregister_pernet;
1da177e4 1829#endif
1762f7e8
DL		 1830 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1831 if (err)
1832 goto out_unregister_sysctl;
1833out:
1834 return err;
1da177e4 1835
1762f7e8
DL		 1836out_unregister_sysctl:
1837#ifdef CONFIG_SYSCTL
1838 neigh_sysctl_unregister(&nd_tbl.parms);
1839out_unregister_pernet:
1840#endif
1841 unregister_pernet_subsys(&ndisc_net_ops);
1842 goto out;
1da177e4
LT		 1843}
1844
1845void ndisc_cleanup(void)
1846{
36f73d0c 1847 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1da177e4
LT		 1848#ifdef CONFIG_SYSCTL
1849 neigh_sysctl_unregister(&nd_tbl.parms);
1850#endif
1851 neigh_table_clear(&nd_tbl);
1762f7e8 1852 unregister_pernet_subsys(&ndisc_net_ops);
1da177e4 1853}
kernel source for telekom puls (alcatel/mediatek)