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addrconf: refuse isatap eui64 for INADDR_ANY
[linux-block.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
305d552a
BH		 440struct sk_buff *ndisc_build_skb(struct net_device *dev,
441 const struct in6_addr *daddr,
442 const struct in6_addr *saddr,
443 struct icmp6hdr *icmp6h,
444 const struct in6_addr *target,
445 int llinfo)
1da177e4 446{
c346dca1 447 struct net *net = dev_net(dev);
1762f7e8 448 struct sock *sk = net->ipv6.ndisc_sk;
1ab1457c 449 struct sk_buff *skb;
e1ec7842 450 struct icmp6hdr *hdr;
e1ec7842 451 int len;
1da177e4 452 int err;
305d552a 453 u8 *opt;
1da177e4 454
e1ec7842
YH		 455 if (!dev->addr_len)
456 llinfo = 0;
457
458 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
459 if (llinfo)
460 len += ndisc_opt_addr_space(dev);
1da177e4 461
d54a81d3
DM		 462 skb = sock_alloc_send_skb(sk,
463 (MAX_HEADER + sizeof(struct ipv6hdr) +
f5184d26 464 len + LL_ALLOCATED_SPACE(dev)),
1da177e4 465 1, &err);
e1ec7842 466 if (!skb) {
1da177e4 467 ND_PRINTK0(KERN_ERR
e1ec7842 468 "ICMPv6 ND: %s() failed to allocate an skb.\n",
0dc47877 469 __func__);
305d552a 470 return NULL;
1da177e4
LT		 471 }
472
473 skb_reserve(skb, LL_RESERVED_SPACE(dev));
e1ec7842 474 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
1da177e4 475
27a884dc 476 skb->transport_header = skb->tail;
d10ba34b 477 skb_put(skb, len);
1da177e4 478
e1ec7842
YH		 479 hdr = (struct icmp6hdr *)skb_transport_header(skb);
480 memcpy(hdr, icmp6h, sizeof(*hdr));
1da177e4 481
e1ec7842
YH		 482 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
483 if (target) {
484 ipv6_addr_copy((struct in6_addr *)opt, target);
485 opt += sizeof(*target);
486 }
1da177e4 487
e1ec7842
YH		 488 if (llinfo)
489 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
1da177e4
LT		 490 dev->addr_len, dev->type);
491
e1ec7842
YH		 492 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
493 IPPROTO_ICMPV6,
07f0757a 494 csum_partial(hdr,
e1ec7842 495 len, 0));
1da177e4 496
305d552a
BH		 497 return skb;
498}
499
500EXPORT_SYMBOL(ndisc_build_skb);
501
502void ndisc_send_skb(struct sk_buff *skb,
503 struct net_device *dev,
504 struct neighbour *neigh,
505 const struct in6_addr *daddr,
506 const struct in6_addr *saddr,
507 struct icmp6hdr *icmp6h)
508{
509 struct flowi fl;
510 struct dst_entry *dst;
511 struct net *net = dev_net(dev);
512 struct sock *sk = net->ipv6.ndisc_sk;
513 struct inet6_dev *idev;
514 int err;
515 u8 type;
516
517 type = icmp6h->icmp6_type;
518
519 icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
520
521 dst = icmp6_dst_alloc(dev, neigh, daddr);
522 if (!dst) {
523 kfree_skb(skb);
524 return;
525 }
526
52479b62 527 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
305d552a
BH		 528 if (err < 0) {
529 kfree_skb(skb);
530 return;
531 }
532
1da177e4 533 skb->dst = dst;
e1ec7842 534
1da177e4 535 idev = in6_dev_get(dst->dev);
edf391ff 536 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
e1ec7842 537
6e23ae2a
PM		 538 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
539 dst_output);
1da177e4 540 if (!err) {
5c5d244b 541 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 542 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 543 }
544
545 if (likely(idev != NULL))
546 in6_dev_put(idev);
1ab1457c 547}
1da177e4 548
305d552a
BH		 549EXPORT_SYMBOL(ndisc_send_skb);
550
551/*
552 * Send a Neighbour Discover packet
553 */
554static void __ndisc_send(struct net_device *dev,
555 struct neighbour *neigh,
556 const struct in6_addr *daddr,
557 const struct in6_addr *saddr,
558 struct icmp6hdr *icmp6h, const struct in6_addr *target,
559 int llinfo)
560{
561 struct sk_buff *skb;
562
563 skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo);
564 if (!skb)
565 return;
566
567 ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h);
568}
569
e1ec7842 570static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 571 const struct in6_addr *daddr,
572 const struct in6_addr *solicited_addr,
573 int router, int solicited, int override, int inc_opt)
e1ec7842
YH		 574{
575 struct in6_addr tmpaddr;
576 struct inet6_ifaddr *ifp;
9acd9f3a 577 const struct in6_addr *src_addr;
e1ec7842
YH		 578 struct icmp6hdr icmp6h = {
579 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
580 };
581
582 /* for anycast or proxy, solicited_addr != src_addr */
c346dca1 583 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
e1ec7842
YH		 584 if (ifp) {
585 src_addr = solicited_addr;
586 if (ifp->flags & IFA_F_OPTIMISTIC)
587 override = 0;
588 in6_ifa_put(ifp);
589 } else {
191cd582 590 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
c346dca1 591 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
7cbca67c 592 &tmpaddr))
e1ec7842
YH		 593 return;
594 src_addr = &tmpaddr;
595 }
596
597 icmp6h.icmp6_router = router;
598 icmp6h.icmp6_solicited = solicited;
599 icmp6h.icmp6_override = override;
600
601 __ndisc_send(dev, neigh, daddr, src_addr,
602 &icmp6h, solicited_addr,
14878f75 603 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
e1ec7842
YH		 604}
605
1da177e4 606void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 607 const struct in6_addr *solicit,
608 const struct in6_addr *daddr, const struct in6_addr *saddr)
1da177e4 609{
1da177e4 610 struct in6_addr addr_buf;
e1ec7842
YH		 611 struct icmp6hdr icmp6h = {
612 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
613 };
1da177e4
LT		 614
615 if (saddr == NULL) {
95c385b4
NH		 616 if (ipv6_get_lladdr(dev, &addr_buf,
617 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
1da177e4
LT		 618 return;
619 saddr = &addr_buf;
620 }
621
e1ec7842
YH		 622 __ndisc_send(dev, neigh, daddr, saddr,
623 &icmp6h, solicit,
14878f75 624 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4
LT		 625}
626
9acd9f3a
YH		 627void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
628 const struct in6_addr *daddr)
1da177e4 629{
e1ec7842
YH		 630 struct icmp6hdr icmp6h = {
631 .icmp6_type = NDISC_ROUTER_SOLICITATION,
632 };
95c385b4 633 int send_sllao = dev->addr_len;
95c385b4
NH		 634
635#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
636 /*
637 * According to section 2.2 of RFC 4429, we must not
638 * send router solicitations with a sllao from
639 * optimistic addresses, but we may send the solicitation
640 * if we don't include the sllao. So here we check
641 * if our address is optimistic, and if so, we
bea85195 642 * suppress the inclusion of the sllao.
95c385b4
NH		 643 */
644 if (send_sllao) {
c346dca1 645 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
1cab3da6 646 dev, 1);
95c385b4
NH		 647 if (ifp) {
648 if (ifp->flags & IFA_F_OPTIMISTIC) {
ca043569 649 send_sllao = 0;
95c385b4 650 }
ca043569 651 in6_ifa_put(ifp);
95c385b4
NH		 652 } else {
653 send_sllao = 0;
654 }
655 }
656#endif
e1ec7842
YH		 657 __ndisc_send(dev, NULL, daddr, saddr,
658 &icmp6h, NULL,
14878f75 659 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4 660}
1ab1457c 661
1da177e4
LT		 662
663static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
664{
665 /*
666 * "The sender MUST return an ICMP
667 * destination unreachable"
668 */
669 dst_link_failure(skb);
670 kfree_skb(skb);
671}
672
673/* Called with locked neigh: either read or both */
674
675static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
676{
677 struct in6_addr *saddr = NULL;
678 struct in6_addr mcaddr;
679 struct net_device *dev = neigh->dev;
680 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
681 int probes = atomic_read(&neigh->probes);
682
c346dca1 683 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
0660e03f 684 saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 685
686 if ((probes -= neigh->parms->ucast_probes) < 0) {
687 if (!(neigh->nud_state & NUD_VALID)) {
5b095d98 688 ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n",
0c6ce78a 689 __func__, target);
1da177e4
LT		 690 }
691 ndisc_send_ns(dev, neigh, target, target, saddr);
692 } else if ((probes -= neigh->parms->app_probes) < 0) {
693#ifdef CONFIG_ARPD
694 neigh_app_ns(neigh);
695#endif
696 } else {
697 addrconf_addr_solict_mult(target, &mcaddr);
698 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
699 }
700}
701
0736ffc0
YH		 702static int pndisc_is_router(const void *pkey,
703 struct net_device *dev)
fa86d322
PE		 704{
705 struct pneigh_entry *n;
0736ffc0 706 int ret = -1;
fa86d322
PE		 707
708 read_lock_bh(&nd_tbl.lock);
0736ffc0
YH		 709 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
710 if (n)
711 ret = !!(n->flags & NTF_ROUTER);
fa86d322
PE		 712 read_unlock_bh(&nd_tbl.lock);
713
0736ffc0 714 return ret;
fa86d322
PE		 715}
716
1da177e4
LT		 717static void ndisc_recv_ns(struct sk_buff *skb)
718{
9c70220b 719 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
0660e03f
ACM		 720 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
721 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 722 u8 *lladdr = NULL;
27a884dc
ACM		 723 u32 ndoptlen = skb->tail - (skb->transport_header +
724 offsetof(struct nd_msg, opt));
1da177e4
LT		 725 struct ndisc_options ndopts;
726 struct net_device *dev = skb->dev;
727 struct inet6_ifaddr *ifp;
728 struct inet6_dev *idev = NULL;
729 struct neighbour *neigh;
730 int dad = ipv6_addr_any(saddr);
731 int inc;
0736ffc0 732 int is_router = -1;
1da177e4
LT		 733
734 if (ipv6_addr_is_multicast(&msg->target)) {
1ab1457c 735 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 736 "ICMPv6 NS: multicast target address");
737 return;
738 }
739
740 /*
741 * RFC2461 7.1.1:
742 * DAD has to be destined for solicited node multicast address.
743 */
744 if (dad &&
745 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
746 daddr->s6_addr32[1] == htonl(0x00000000) &&
747 daddr->s6_addr32[2] == htonl(0x00000001) &&
748 daddr->s6_addr [12] == 0xff )) {
749 ND_PRINTK2(KERN_WARNING
750 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
751 return;
752 }
753
754 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
1ab1457c 755 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 756 "ICMPv6 NS: invalid ND options\n");
757 return;
758 }
759
760 if (ndopts.nd_opts_src_lladdr) {
761 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
762 if (!lladdr) {
763 ND_PRINTK2(KERN_WARNING
764 "ICMPv6 NS: invalid link-layer address length\n");
765 return;
766 }
767
768 /* RFC2461 7.1.1:
1ab1457c
YH		 769 * If the IP source address is the unspecified address,
770 * there MUST NOT be source link-layer address option
1da177e4
LT		 771 * in the message.
772 */
773 if (dad) {
1ab1457c 774 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 775 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
776 return;
777 }
778 }
779
780 inc = ipv6_addr_is_multicast(daddr);
781
c346dca1 782 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 783 if (ifp) {
95c385b4
NH		 784
785 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
786 if (dad) {
787 if (dev->type == ARPHRD_IEEE802_TR) {
98e399f8
ACM		 788 const unsigned char *sadr;
789 sadr = skb_mac_header(skb);
95c385b4
NH		 790 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
791 sadr[9] == dev->dev_addr[1] &&
792 sadr[10] == dev->dev_addr[2] &&
793 sadr[11] == dev->dev_addr[3] &&
794 sadr[12] == dev->dev_addr[4] &&
795 sadr[13] == dev->dev_addr[5]) {
796 /* looped-back to us */
797 goto out;
798 }
799 }
800
801 /*
802 * We are colliding with another node
803 * who is doing DAD
804 * so fail our DAD process
805 */
806 addrconf_dad_failure(ifp);
9e3be4b3 807 return;
95c385b4
NH		 808 } else {
809 /*
810 * This is not a dad solicitation.
811 * If we are an optimistic node,
812 * we should respond.
813 * Otherwise, we should ignore it.
814 */
815 if (!(ifp->flags & IFA_F_OPTIMISTIC))
1da177e4 816 goto out;
1da177e4 817 }
1da177e4
LT		 818 }
819
820 idev = ifp->idev;
821 } else {
53b7997f
YH		 822 struct net *net = dev_net(dev);
823
1da177e4
LT		 824 idev = in6_dev_get(dev);
825 if (!idev) {
826 /* XXX: count this drop? */
827 return;
828 }
829
53b7997f 830 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
1ab1457c 831 (idev->cnf.forwarding &&
53b7997f 832 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
0736ffc0 833 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
a61bbcf2 834 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
1da177e4
LT		 835 skb->pkt_type != PACKET_HOST &&
836 inc != 0 &&
837 idev->nd_parms->proxy_delay != 0) {
838 /*
839 * for anycast or proxy,
1ab1457c
YH		 840 * sender should delay its response
841 * by a random time between 0 and
1da177e4
LT		 842 * MAX_ANYCAST_DELAY_TIME seconds.
843 * (RFC2461) -- yoshfuji
844 */
845 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
846 if (n)
847 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
848 goto out;
849 }
850 } else
851 goto out;
852 }
853
0736ffc0
YH		 854 if (is_router < 0)
855 is_router = !!idev->cnf.forwarding;
62dd9318 856
1da177e4 857 if (dad) {
f3ee4010 858 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
62dd9318 859 is_router, 0, (ifp != NULL), 1);
1da177e4
LT		 860 goto out;
861 }
862
863 if (inc)
864 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
865 else
866 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
867
1ab1457c 868 /*
1da177e4
LT		 869 * update / create cache entry
870 * for the source address
871 */
872 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
873 !inc || lladdr || !dev->addr_len);
874 if (neigh)
1ab1457c 875 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 876 NEIGH_UPDATE_F_WEAK_OVERRIDE|
877 NEIGH_UPDATE_F_OVERRIDE);
3b04ddde 878 if (neigh || !dev->header_ops) {
1da177e4 879 ndisc_send_na(dev, neigh, saddr, &msg->target,
62dd9318 880 is_router,
1da177e4
LT		 881 1, (ifp != NULL && inc), inc);
882 if (neigh)
883 neigh_release(neigh);
884 }
885
886out:
887 if (ifp)
888 in6_ifa_put(ifp);
889 else
890 in6_dev_put(idev);
891
892 return;
893}
894
895static void ndisc_recv_na(struct sk_buff *skb)
896{
9c70220b 897 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
0660e03f
ACM		 898 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
899 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 900 u8 *lladdr = NULL;
27a884dc
ACM		 901 u32 ndoptlen = skb->tail - (skb->transport_header +
902 offsetof(struct nd_msg, opt));
1da177e4
LT		 903 struct ndisc_options ndopts;
904 struct net_device *dev = skb->dev;
905 struct inet6_ifaddr *ifp;
906 struct neighbour *neigh;
907
908 if (skb->len < sizeof(struct nd_msg)) {
909 ND_PRINTK2(KERN_WARNING
910 "ICMPv6 NA: packet too short\n");
911 return;
912 }
913
914 if (ipv6_addr_is_multicast(&msg->target)) {
915 ND_PRINTK2(KERN_WARNING
916 "ICMPv6 NA: target address is multicast.\n");
917 return;
918 }
919
920 if (ipv6_addr_is_multicast(daddr) &&
921 msg->icmph.icmp6_solicited) {
922 ND_PRINTK2(KERN_WARNING
923 "ICMPv6 NA: solicited NA is multicasted.\n");
924 return;
925 }
1ab1457c 926
1da177e4
LT		 927 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
928 ND_PRINTK2(KERN_WARNING
929 "ICMPv6 NS: invalid ND option\n");
930 return;
931 }
932 if (ndopts.nd_opts_tgt_lladdr) {
933 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
934 if (!lladdr) {
935 ND_PRINTK2(KERN_WARNING
936 "ICMPv6 NA: invalid link-layer address length\n");
937 return;
938 }
939 }
c346dca1 940 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 941 if (ifp) {
1da177e4
LT		 942 if (ifp->flags & IFA_F_TENTATIVE) {
943 addrconf_dad_failure(ifp);
944 return;
945 }
946 /* What should we make now? The advertisement
947 is invalid, but ndisc specs say nothing
948 about it. It could be misconfiguration, or
949 an smart proxy agent tries to help us :-)
24fc7b86
JS		 950
951 We should not print the error if NA has been
952 received from loopback - it is just our own
953 unsolicited advertisement.
1da177e4 954 */
24fc7b86
JS		 955 if (skb->pkt_type != PACKET_LOOPBACK)
956 ND_PRINTK1(KERN_WARNING
1da177e4
LT		 957 "ICMPv6 NA: someone advertises our address on %s!\n",
958 ifp->idev->dev->name);
959 in6_ifa_put(ifp);
960 return;
961 }
962 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
963
964 if (neigh) {
965 u8 old_flags = neigh->flags;
53b7997f 966 struct net *net = dev_net(dev);
1da177e4
LT		 967
968 if (neigh->nud_state & NUD_FAILED)
969 goto out;
970
5f3e6e9e
VN		 971 /*
972 * Don't update the neighbor cache entry on a proxy NA from
973 * ourselves because either the proxied node is off link or it
974 * has already sent a NA to us.
975 */
976 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
53b7997f
YH		 977 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
978 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
fbea49e1 979 /* XXX: idev->cnf.prixy_ndp */
5f3e6e9e 980 goto out;
fbea49e1 981 }
5f3e6e9e 982
1da177e4
LT		 983 neigh_update(neigh, lladdr,
984 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
985 NEIGH_UPDATE_F_WEAK_OVERRIDE|
986 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
987 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
988 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
989
990 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
991 /*
992 * Change: router to host
993 */
994 struct rt6_info *rt;
995 rt = rt6_get_dflt_router(saddr, dev);
996 if (rt)
e0a1ad73 997 ip6_del_rt(rt);
1da177e4
LT		 998 }
999
1000out:
1001 neigh_release(neigh);
1002 }
1003}
1004
1005static void ndisc_recv_rs(struct sk_buff *skb)
1006{
9c70220b 1007 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1da177e4
LT		 1008 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1009 struct neighbour *neigh;
1010 struct inet6_dev *idev;
0660e03f 1011 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 1012 struct ndisc_options ndopts;
1013 u8 *lladdr = NULL;
1014
1015 if (skb->len < sizeof(*rs_msg))
1016 return;
1017
1018 idev = in6_dev_get(skb->dev);
1019 if (!idev) {
1020 if (net_ratelimit())
1021 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
1022 return;
1023 }
1024
1025 /* Don't accept RS if we're not in router mode */
1026 if (!idev->cnf.forwarding)
1027 goto out;
1028
1029 /*
1030 * Don't update NCE if src = ::;
1031 * this implies that the source node has no ip address assigned yet.
1032 */
1033 if (ipv6_addr_any(saddr))
1034 goto out;
1035
1036 /* Parse ND options */
1037 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
1038 if (net_ratelimit())
1039 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1040 goto out;
1041 }
1042
1043 if (ndopts.nd_opts_src_lladdr) {
1044 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1045 skb->dev);
1046 if (!lladdr)
1047 goto out;
1048 }
1049
1050 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1051 if (neigh) {
1052 neigh_update(neigh, lladdr, NUD_STALE,
1053 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1054 NEIGH_UPDATE_F_OVERRIDE|
1055 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1056 neigh_release(neigh);
1057 }
1058out:
1059 in6_dev_put(idev);
1060}
1061
31910575
PY		 1062static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1063{
1064 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1065 struct sk_buff *skb;
1066 struct nlmsghdr *nlh;
1067 struct nduseroptmsg *ndmsg;
c346dca1 1068 struct net *net = dev_net(ra->dev);
31910575
PY		 1069 int err;
1070 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1071 + (opt->nd_opt_len << 3));
1072 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1073
1074 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1075 if (skb == NULL) {
1076 err = -ENOBUFS;
1077 goto errout;
1078 }
1079
1080 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1081 if (nlh == NULL) {
1082 goto nla_put_failure;
1083 }
1084
1085 ndmsg = nlmsg_data(nlh);
1086 ndmsg->nduseropt_family = AF_INET6;
dbb2ed24 1087 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
31910575
PY		 1088 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1089 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1090 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1091
1092 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1093
1094 NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1095 &ipv6_hdr(ra)->saddr);
1096 nlmsg_end(skb, nlh);
1097
1ce85fe4 1098 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
31910575
PY		 1099 return;
1100
1101nla_put_failure:
1102 nlmsg_free(skb);
1103 err = -EMSGSIZE;
1104errout:
a18bc695 1105 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
31910575
PY		 1106}
1107
1da177e4
LT		 1108static void ndisc_router_discovery(struct sk_buff *skb)
1109{
9c70220b 1110 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1da177e4
LT		 1111 struct neighbour *neigh = NULL;
1112 struct inet6_dev *in6_dev;
65f5c7c1 1113 struct rt6_info *rt = NULL;
1da177e4
LT		 1114 int lifetime;
1115 struct ndisc_options ndopts;
1116 int optlen;
ebacaaa0 1117 unsigned int pref = 0;
1da177e4
LT		 1118
1119 __u8 * opt = (__u8 *)(ra_msg + 1);
1120
27a884dc 1121 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1da177e4 1122
0660e03f 1123 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1124 ND_PRINTK2(KERN_WARNING
1125 "ICMPv6 RA: source address is not link-local.\n");
1126 return;
1127 }
1128 if (optlen < 0) {
1ab1457c 1129 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1130 "ICMPv6 RA: packet too short\n");
1131 return;
1132 }
1133
de357cc0 1134#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1135 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1136 ND_PRINTK2(KERN_WARNING
1137 "ICMPv6 RA: from host or unauthorized router\n");
1138 return;
1139 }
de357cc0 1140#endif
fadf6bf0 1141
1da177e4
LT		 1142 /*
1143 * set the RA_RECV flag in the interface
1144 */
1145
1146 in6_dev = in6_dev_get(skb->dev);
1147 if (in6_dev == NULL) {
1148 ND_PRINTK0(KERN_ERR
1149 "ICMPv6 RA: can't find inet6 device for %s.\n",
1150 skb->dev->name);
1151 return;
1152 }
1153 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
1154 in6_dev_put(in6_dev);
1155 return;
1156 }
1157
1158 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1159 in6_dev_put(in6_dev);
1160 ND_PRINTK2(KERN_WARNING
1161 "ICMP6 RA: invalid ND options\n");
1162 return;
1163 }
1164
de357cc0 1165#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1166 /* skip link-specific parameters from interior routers */
1167 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1168 goto skip_linkparms;
de357cc0 1169#endif
fadf6bf0 1170
1da177e4
LT		 1171 if (in6_dev->if_flags & IF_RS_SENT) {
1172 /*
1173 * flag that an RA was received after an RS was sent
1174 * out on this interface.
1175 */
1176 in6_dev->if_flags |= IF_RA_RCVD;
1177 }
1178
1179 /*
1180 * Remember the managed/otherconf flags from most recently
1181 * received RA message (RFC 2462) -- yoshfuji
1182 */
1183 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1184 IF_RA_OTHERCONF)) |
1185 (ra_msg->icmph.icmp6_addrconf_managed ?
1186 IF_RA_MANAGED : 0) |
1187 (ra_msg->icmph.icmp6_addrconf_other ?
1188 IF_RA_OTHERCONF : 0);
1189
65f5c7c1
YH		 1190 if (!in6_dev->cnf.accept_ra_defrtr)
1191 goto skip_defrtr;
1192
1da177e4
LT		 1193 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1194
ebacaaa0
YH		 1195#ifdef CONFIG_IPV6_ROUTER_PREF
1196 pref = ra_msg->icmph.icmp6_router_pref;
1197 /* 10b is handled as if it were 00b (medium) */
930d6ff2 1198 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
6d5b78cd 1199 !in6_dev->cnf.accept_ra_rtr_pref)
ebacaaa0
YH		 1200 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1201#endif
1202
0660e03f 1203 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1da177e4
LT		 1204
1205 if (rt)
1206 neigh = rt->rt6i_nexthop;
1207
1208 if (rt && lifetime == 0) {
1209 neigh_clone(neigh);
e0a1ad73 1210 ip6_del_rt(rt);
1da177e4
LT		 1211 rt = NULL;
1212 }
1213
1214 if (rt == NULL && lifetime) {
1215 ND_PRINTK3(KERN_DEBUG
1216 "ICMPv6 RA: adding default router.\n");
1217
0660e03f 1218 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1da177e4
LT		 1219 if (rt == NULL) {
1220 ND_PRINTK0(KERN_ERR
1221 "ICMPv6 RA: %s() failed to add default route.\n",
0dc47877 1222 __func__);
1da177e4
LT		 1223 in6_dev_put(in6_dev);
1224 return;
1225 }
1226
1227 neigh = rt->rt6i_nexthop;
1228 if (neigh == NULL) {
1229 ND_PRINTK0(KERN_ERR
1230 "ICMPv6 RA: %s() got default router without neighbour.\n",
0dc47877 1231 __func__);
1da177e4
LT		 1232 dst_release(&rt->u.dst);
1233 in6_dev_put(in6_dev);
1234 return;
1235 }
1236 neigh->flags |= NTF_ROUTER;
ebacaaa0 1237 } else if (rt) {
22441cfa 1238 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1da177e4
LT		 1239 }
1240
1241 if (rt)
1242 rt->rt6i_expires = jiffies + (HZ * lifetime);
1243
1244 if (ra_msg->icmph.icmp6_hop_limit) {
1245 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1246 if (rt)
1247 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
1248 }
1249
65f5c7c1
YH		 1250skip_defrtr:
1251
1da177e4
LT		 1252 /*
1253 * Update Reachable Time and Retrans Timer
1254 */
1255
1256 if (in6_dev->nd_parms) {
1257 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1258
1259 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1260 rtime = (rtime*HZ)/1000;
1261 if (rtime < HZ/10)
1262 rtime = HZ/10;
1263 in6_dev->nd_parms->retrans_time = rtime;
1264 in6_dev->tstamp = jiffies;
1265 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1266 }
1267
1268 rtime = ntohl(ra_msg->reachable_time);
1269 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1270 rtime = (rtime*HZ)/1000;
1271
1272 if (rtime < HZ/10)
1273 rtime = HZ/10;
1274
1275 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1276 in6_dev->nd_parms->base_reachable_time = rtime;
1277 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1278 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1279 in6_dev->tstamp = jiffies;
1280 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1281 }
1282 }
1283 }
1284
de357cc0 1285#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0 1286skip_linkparms:
de357cc0 1287#endif
fadf6bf0 1288
1da177e4
LT		 1289 /*
1290 * Process options.
1291 */
1292
1293 if (!neigh)
0660e03f 1294 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1295 skb->dev, 1);
1296 if (neigh) {
1297 u8 *lladdr = NULL;
1298 if (ndopts.nd_opts_src_lladdr) {
1299 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1300 skb->dev);
1301 if (!lladdr) {
1302 ND_PRINTK2(KERN_WARNING
1303 "ICMPv6 RA: invalid link-layer address length\n");
1304 goto out;
1305 }
1306 }
1307 neigh_update(neigh, lladdr, NUD_STALE,
1308 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1309 NEIGH_UPDATE_F_OVERRIDE|
1310 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1311 NEIGH_UPDATE_F_ISROUTER);
1312 }
1313
70ceb4f5 1314#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 1315 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
70ceb4f5
YH		 1316 struct nd_opt_hdr *p;
1317 for (p = ndopts.nd_opts_ri;
1318 p;
1319 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
6294e000
YH		 1320 struct route_info *ri = (struct route_info *)p;
1321#ifdef CONFIG_IPV6_NDISC_NODETYPE
1322 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1323 ri->prefix_len == 0)
1324 continue;
1325#endif
1326 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
09c884d4 1327 continue;
70ceb4f5 1328 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
0660e03f 1329 &ipv6_hdr(skb)->saddr);
70ceb4f5
YH		 1330 }
1331 }
1332#endif
1333
de357cc0 1334#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1335 /* skip link-specific ndopts from interior routers */
1336 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1337 goto out;
de357cc0 1338#endif
fadf6bf0 1339
c4fd30eb 1340 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1da177e4
LT		 1341 struct nd_opt_hdr *p;
1342 for (p = ndopts.nd_opts_pi;
1343 p;
1344 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1345 addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
1346 }
1347 }
1348
1349 if (ndopts.nd_opts_mtu) {
e69a4adc 1350 __be32 n;
1da177e4
LT		 1351 u32 mtu;
1352
e69a4adc
AV		 1353 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1354 mtu = ntohl(n);
1da177e4
LT		 1355
1356 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1357 ND_PRINTK2(KERN_WARNING
1358 "ICMPv6 RA: invalid mtu: %d\n",
1359 mtu);
1360 } else if (in6_dev->cnf.mtu6 != mtu) {
1361 in6_dev->cnf.mtu6 = mtu;
1362
1363 if (rt)
1364 rt->u.dst.metrics[RTAX_MTU-1] = mtu;
1365
1366 rt6_mtu_change(skb->dev, mtu);
1367 }
1368 }
1ab1457c 1369
31910575 1370 if (ndopts.nd_useropts) {
61cf46ad
YH		 1371 struct nd_opt_hdr *p;
1372 for (p = ndopts.nd_useropts;
1373 p;
1374 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1375 ndisc_ra_useropt(skb, p);
31910575
PY		 1376 }
1377 }
1378
1da177e4
LT		 1379 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1380 ND_PRINTK2(KERN_WARNING
1381 "ICMPv6 RA: invalid RA options");
1382 }
1383out:
1384 if (rt)
1385 dst_release(&rt->u.dst);
1386 else if (neigh)
1387 neigh_release(neigh);
1388 in6_dev_put(in6_dev);
1389}
1390
1391static void ndisc_redirect_rcv(struct sk_buff *skb)
1392{
1393 struct inet6_dev *in6_dev;
1394 struct icmp6hdr *icmph;
1395 struct in6_addr *dest;
1396 struct in6_addr *target; /* new first hop to destination */
1397 struct neighbour *neigh;
1398 int on_link = 0;
1399 struct ndisc_options ndopts;
1400 int optlen;
1401 u8 *lladdr = NULL;
1402
de357cc0 1403#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1404 switch (skb->ndisc_nodetype) {
1405 case NDISC_NODETYPE_HOST:
1406 case NDISC_NODETYPE_NODEFAULT:
1407 ND_PRINTK2(KERN_WARNING
1408 "ICMPv6 Redirect: from host or unauthorized router\n");
1409 return;
1410 }
de357cc0 1411#endif
fadf6bf0 1412
0660e03f 1413 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1414 ND_PRINTK2(KERN_WARNING
1415 "ICMPv6 Redirect: source address is not link-local.\n");
1416 return;
1417 }
1418
27a884dc 1419 optlen = skb->tail - skb->transport_header;
1da177e4
LT		 1420 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1421
1422 if (optlen < 0) {
1423 ND_PRINTK2(KERN_WARNING
1424 "ICMPv6 Redirect: packet too short\n");
1425 return;
1426 }
1427
cc70ab26 1428 icmph = icmp6_hdr(skb);
1da177e4
LT		 1429 target = (struct in6_addr *) (icmph + 1);
1430 dest = target + 1;
1431
1432 if (ipv6_addr_is_multicast(dest)) {
1433 ND_PRINTK2(KERN_WARNING
1434 "ICMPv6 Redirect: destination address is multicast.\n");
1435 return;
1436 }
1437
1438 if (ipv6_addr_equal(dest, target)) {
1439 on_link = 1;
bf0b48df
BH		 1440 } else if (ipv6_addr_type(target) !=
1441 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1ab1457c 1442 ND_PRINTK2(KERN_WARNING
bf0b48df 1443 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1da177e4
LT		 1444 return;
1445 }
1446
1447 in6_dev = in6_dev_get(skb->dev);
1448 if (!in6_dev)
1449 return;
1450 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
1451 in6_dev_put(in6_dev);
1452 return;
1453 }
1454
1ab1457c 1455 /* RFC2461 8.1:
1da177e4
LT		 1456 * The IP source address of the Redirect MUST be the same as the current
1457 * first-hop router for the specified ICMP Destination Address.
1458 */
1ab1457c 1459
1da177e4
LT		 1460 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1461 ND_PRINTK2(KERN_WARNING
1462 "ICMPv6 Redirect: invalid ND options\n");
1463 in6_dev_put(in6_dev);
1464 return;
1465 }
1466 if (ndopts.nd_opts_tgt_lladdr) {
1467 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1468 skb->dev);
1469 if (!lladdr) {
1470 ND_PRINTK2(KERN_WARNING
1471 "ICMPv6 Redirect: invalid link-layer address length\n");
1472 in6_dev_put(in6_dev);
1473 return;
1474 }
1475 }
1476
1477 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1478 if (neigh) {
0660e03f
ACM		 1479 rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
1480 &ipv6_hdr(skb)->saddr, neigh, lladdr,
1da177e4
LT		 1481 on_link);
1482 neigh_release(neigh);
1483 }
1484 in6_dev_put(in6_dev);
1485}
1486
1487void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
9acd9f3a 1488 const struct in6_addr *target)
1da177e4 1489{
1762f7e8 1490 struct net_device *dev = skb->dev;
c346dca1 1491 struct net *net = dev_net(dev);
1762f7e8 1492 struct sock *sk = net->ipv6.ndisc_sk;
1da177e4
LT		 1493 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1494 struct sk_buff *buff;
1495 struct icmp6hdr *icmph;
1496 struct in6_addr saddr_buf;
1497 struct in6_addr *addrp;
1da177e4
LT		 1498 struct rt6_info *rt;
1499 struct dst_entry *dst;
1500 struct inet6_dev *idev;
1501 struct flowi fl;
1502 u8 *opt;
1503 int rd_len;
1504 int err;
1da177e4
LT		 1505 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1506
95c385b4 1507 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1da177e4
LT		 1508 ND_PRINTK2(KERN_WARNING
1509 "ICMPv6 Redirect: no link-local address on %s\n",
1510 dev->name);
1ab1457c
YH		 1511 return;
1512 }
1da177e4 1513
0660e03f 1514 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
bf0b48df 1515 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
29556526 1516 ND_PRINTK2(KERN_WARNING
bf0b48df 1517 "ICMPv6 Redirect: target address is not link-local unicast.\n");
29556526
LY		 1518 return;
1519 }
1520
1762f7e8 1521 icmpv6_flow_init(sk, &fl, NDISC_REDIRECT,
95e41e93 1522 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1da177e4 1523
1762f7e8 1524 dst = ip6_route_output(net, NULL, &fl);
1da177e4
LT		 1525 if (dst == NULL)
1526 return;
1527
52479b62 1528 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
e104411b 1529 if (err)
1da177e4 1530 return;
1da177e4
LT		 1531
1532 rt = (struct rt6_info *) dst;
1533
1534 if (rt->rt6i_flags & RTF_GATEWAY) {
1535 ND_PRINTK2(KERN_WARNING
1536 "ICMPv6 Redirect: destination is not a neighbour.\n");
d73f0801 1537 goto release;
1da177e4 1538 }
d73f0801
IJ		 1539 if (!xrlim_allow(dst, 1*HZ))
1540 goto release;
1da177e4
LT		 1541
1542 if (dev->addr_len) {
1543 read_lock_bh(&neigh->lock);
1544 if (neigh->nud_state & NUD_VALID) {
1545 memcpy(ha_buf, neigh->ha, dev->addr_len);
1546 read_unlock_bh(&neigh->lock);
1547 ha = ha_buf;
1548 len += ndisc_opt_addr_space(dev);
1549 } else
1550 read_unlock_bh(&neigh->lock);
1551 }
1552
1553 rd_len = min_t(unsigned int,
1554 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1555 rd_len &= ~0x7;
1556 len += rd_len;
1557
d54a81d3
DM		 1558 buff = sock_alloc_send_skb(sk,
1559 (MAX_HEADER + sizeof(struct ipv6hdr) +
f5184d26 1560 len + LL_ALLOCATED_SPACE(dev)),
1da177e4
LT		 1561 1, &err);
1562 if (buff == NULL) {
1563 ND_PRINTK0(KERN_ERR
1564 "ICMPv6 Redirect: %s() failed to allocate an skb.\n",
0dc47877 1565 __func__);
d73f0801 1566 goto release;
1da177e4
LT		 1567 }
1568
1da177e4 1569 skb_reserve(buff, LL_RESERVED_SPACE(dev));
0660e03f 1570 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1571 IPPROTO_ICMPV6, len);
1572
27a884dc 1573 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
d10ba34b
ACM		 1574 skb_put(buff, len);
1575 icmph = icmp6_hdr(buff);
1da177e4
LT		 1576
1577 memset(icmph, 0, sizeof(struct icmp6hdr));
1578 icmph->icmp6_type = NDISC_REDIRECT;
1579
1580 /*
1581 * copy target and destination addresses
1582 */
1583
1584 addrp = (struct in6_addr *)(icmph + 1);
1585 ipv6_addr_copy(addrp, target);
1586 addrp++;
0660e03f 1587 ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 1588
1589 opt = (u8*) (addrp + 1);
1590
1591 /*
1592 * include target_address option
1593 */
1594
1595 if (ha)
1596 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1597 dev->addr_len, dev->type);
1598
1599 /*
1600 * build redirect option and copy skb over to the new packet.
1601 */
1602
1ab1457c 1603 memset(opt, 0, 8);
1da177e4
LT		 1604 *(opt++) = ND_OPT_REDIRECT_HDR;
1605 *(opt++) = (rd_len >> 3);
1606 opt += 6;
1607
0660e03f 1608 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1da177e4 1609
0660e03f 1610 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4 1611 len, IPPROTO_ICMPV6,
07f0757a 1612 csum_partial(icmph, len, 0));
1da177e4
LT		 1613
1614 buff->dst = dst;
1615 idev = in6_dev_get(dst->dev);
edf391ff 1616 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
6e23ae2a
PM		 1617 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
1618 dst_output);
1da177e4 1619 if (!err) {
5c5d244b 1620 ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT);
a862f6a6 1621 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 1622 }
1623
1624 if (likely(idev != NULL))
1625 in6_dev_put(idev);
d73f0801
IJ		 1626 return;
1627
1628release:
1629 dst_release(dst);
1da177e4
LT		 1630}
1631
1632static void pndisc_redo(struct sk_buff *skb)
1633{
140e26fc 1634 ndisc_recv_ns(skb);
1da177e4
LT		 1635 kfree_skb(skb);
1636}
1637
1638int ndisc_rcv(struct sk_buff *skb)
1639{
1640 struct nd_msg *msg;
1641
1642 if (!pskb_may_pull(skb, skb->len))
1643 return 0;
1644
9c70220b 1645 msg = (struct nd_msg *)skb_transport_header(skb);
1da177e4 1646
9c70220b 1647 __skb_push(skb, skb->data - skb_transport_header(skb));
1da177e4 1648
0660e03f 1649 if (ipv6_hdr(skb)->hop_limit != 255) {
1da177e4
LT		 1650 ND_PRINTK2(KERN_WARNING
1651 "ICMPv6 NDISC: invalid hop-limit: %d\n",
0660e03f 1652 ipv6_hdr(skb)->hop_limit);
1da177e4
LT		 1653 return 0;
1654 }
1655
1656 if (msg->icmph.icmp6_code != 0) {
1ab1457c 1657 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1658 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1659 msg->icmph.icmp6_code);
1660 return 0;
1661 }
1662
a61bbcf2
PM		 1663 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1664
1da177e4
LT		 1665 switch (msg->icmph.icmp6_type) {
1666 case NDISC_NEIGHBOUR_SOLICITATION:
1667 ndisc_recv_ns(skb);
1668 break;
1669
1670 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1671 ndisc_recv_na(skb);
1672 break;
1673
1674 case NDISC_ROUTER_SOLICITATION:
1675 ndisc_recv_rs(skb);
1676 break;
1677
1678 case NDISC_ROUTER_ADVERTISEMENT:
1679 ndisc_router_discovery(skb);
1680 break;
1681
1682 case NDISC_REDIRECT:
1683 ndisc_redirect_rcv(skb);
1684 break;
3ff50b79 1685 }
1da177e4
LT		 1686
1687 return 0;
1688}
1689
1690static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1691{
1692 struct net_device *dev = ptr;
c346dca1 1693 struct net *net = dev_net(dev);
1da177e4
LT		 1694
1695 switch (event) {
1696 case NETDEV_CHANGEADDR:
1697 neigh_changeaddr(&nd_tbl, dev);
5b7c931d 1698 fib6_run_gc(~0UL, net);
1da177e4
LT		 1699 break;
1700 case NETDEV_DOWN:
1701 neigh_ifdown(&nd_tbl, dev);
5b7c931d 1702 fib6_run_gc(~0UL, net);
1da177e4
LT		 1703 break;
1704 default:
1705 break;
1706 }
1707
1708 return NOTIFY_DONE;
1709}
1710
1711static struct notifier_block ndisc_netdev_notifier = {
1712 .notifier_call = ndisc_netdev_event,
1713};
1714
1715#ifdef CONFIG_SYSCTL
1716static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1717 const char *func, const char *dev_name)
1718{
1719 static char warncomm[TASK_COMM_LEN];
1720 static int warned;
1721 if (strcmp(warncomm, current->comm) && warned < 5) {
1722 strcpy(warncomm, current->comm);
1723 printk(KERN_WARNING
1724 "process `%s' is using deprecated sysctl (%s) "
1725 "net.ipv6.neigh.%s.%s; "
1726 "Use net.ipv6.neigh.%s.%s_ms "
1727 "instead.\n",
1728 warncomm, func,
1729 dev_name, ctl->procname,
1730 dev_name, ctl->procname);
1731 warned++;
1732 }
1733}
1734
1735int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
1736{
1737 struct net_device *dev = ctl->extra1;
1738 struct inet6_dev *idev;
1739 int ret;
1740
d12af679
EB		 1741 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1742 (strcmp(ctl->procname, "base_reachable_time") == 0))
1da177e4
LT		 1743 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1744
d12af679 1745 if (strcmp(ctl->procname, "retrans_time") == 0)
1da177e4 1746 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
d12af679
EB		 1747
1748 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1da177e4
LT		 1749 ret = proc_dointvec_jiffies(ctl, write,
1750 filp, buffer, lenp, ppos);
d12af679
EB		 1751
1752 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
ad02ac14 1753 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1da177e4
LT		 1754 ret = proc_dointvec_ms_jiffies(ctl, write,
1755 filp, buffer, lenp, ppos);
d12af679 1756 else
1da177e4 1757 ret = -1;
1da177e4
LT		 1758
1759 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
d12af679 1760 if (ctl->data == &idev->nd_parms->base_reachable_time)
1da177e4
LT		 1761 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1762 idev->tstamp = jiffies;
1763 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1764 in6_dev_put(idev);
1765 }
1766 return ret;
1767}
1768
f221e726
AD		 1769int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
1770 void __user *oldval, size_t __user *oldlenp,
0686caa3 1771 void __user *newval, size_t newlen)
1da177e4
LT		 1772{
1773 struct net_device *dev = ctl->extra1;
1774 struct inet6_dev *idev;
1775 int ret;
1776
1777 if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
1778 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
1779 ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default");
1780
1781 switch (ctl->ctl_name) {
1782 case NET_NEIGH_REACHABLE_TIME:
f221e726 1783 ret = sysctl_jiffies(ctl, oldval, oldlenp, newval, newlen);
1da177e4
LT		 1784 break;
1785 case NET_NEIGH_RETRANS_TIME_MS:
1786 case NET_NEIGH_REACHABLE_TIME_MS:
f221e726 1787 ret = sysctl_ms_jiffies(ctl, oldval, oldlenp, newval, newlen);
1da177e4
LT		 1788 break;
1789 default:
1790 ret = 0;
1791 }
1792
1793 if (newval && newlen && ret > 0 &&
1794 dev && (idev = in6_dev_get(dev)) != NULL) {
1795 if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
1796 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
1797 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1798 idev->tstamp = jiffies;
1799 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1800 in6_dev_put(idev);
1801 }
1802
1803 return ret;
1804}
1805
1806#endif
1807
1762f7e8 1808static int ndisc_net_init(struct net *net)
1da177e4
LT		 1809{
1810 struct ipv6_pinfo *np;
1811 struct sock *sk;
1ab1457c 1812 int err;
1da177e4 1813
1ed8516f
DL		 1814 err = inet_ctl_sock_create(&sk, PF_INET6,
1815 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 1816 if (err < 0) {
1817 ND_PRINTK0(KERN_ERR
1ab1457c 1818 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1da177e4 1819 err);
1da177e4
LT		 1820 return err;
1821 }
1822
1ed8516f 1823 net->ipv6.ndisc_sk = sk;
1762f7e8 1824
1da177e4 1825 np = inet6_sk(sk);
1da177e4
LT		 1826 np->hop_limit = 255;
1827 /* Do not loopback ndisc messages */
1828 np->mc_loop = 0;
1da177e4 1829
1762f7e8
DL		 1830 return 0;
1831}
1832
1833static void ndisc_net_exit(struct net *net)
1834{
1ed8516f 1835 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1762f7e8
DL		 1836}
1837
1838static struct pernet_operations ndisc_net_ops = {
1839 .init = ndisc_net_init,
1840 .exit = ndisc_net_exit,
1841};
1842
1843int __init ndisc_init(void)
1844{
1845 int err;
1846
1847 err = register_pernet_subsys(&ndisc_net_ops);
1848 if (err)
1849 return err;
1ab1457c
YH		 1850 /*
1851 * Initialize the neighbour table
1852 */
1da177e4
LT		 1853 neigh_table_init(&nd_tbl);
1854
1855#ifdef CONFIG_SYSCTL
1762f7e8
DL		 1856 err = neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6,
1857 NET_IPV6_NEIGH, "ipv6",
1858 &ndisc_ifinfo_sysctl_change,
1859 &ndisc_ifinfo_sysctl_strategy);
1860 if (err)
1861 goto out_unregister_pernet;
1da177e4 1862#endif
1762f7e8
DL		 1863 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1864 if (err)
1865 goto out_unregister_sysctl;
1866out:
1867 return err;
1da177e4 1868
1762f7e8
DL		 1869out_unregister_sysctl:
1870#ifdef CONFIG_SYSCTL
1871 neigh_sysctl_unregister(&nd_tbl.parms);
1872out_unregister_pernet:
1873#endif
1874 unregister_pernet_subsys(&ndisc_net_ops);
1875 goto out;
1da177e4
LT		 1876}
1877
1878void ndisc_cleanup(void)
1879{
36f73d0c 1880 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1da177e4
LT		 1881#ifdef CONFIG_SYSCTL
1882 neigh_sysctl_unregister(&nd_tbl.parms);
1883#endif
1884 neigh_table_clear(&nd_tbl);
1762f7e8 1885 unregister_pernet_subsys(&ndisc_net_ops);
1da177e4 1886}
Linux 6.x block layer and io_uring tree(s)