Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Neighbour Discovery for IPv6 |
| 3 | * Linux INET6 implementation |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 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 | * |
| 18 | * Lars Fenneberg : fixed MTU setting on receipt |
| 19 | * of an RA. |
| 20 | * |
| 21 | * Janos Farkas : kmalloc failure checks |
| 22 | * Alexey Kuznetsov : state machine reworked |
| 23 | * and moved to net/core. |
| 24 | * Pekka Savola : RFC2461 validation |
| 25 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly |
| 26 | */ |
| 27 | |
| 28 | /* Set to 3 to get tracing... */ |
| 29 | #define ND_DEBUG 1 |
| 30 | |
| 31 | #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0) |
| 32 | #define ND_NOPRINTK(x...) do { ; } while(0) |
| 33 | #define ND_PRINTK0 ND_PRINTK |
| 34 | #define ND_PRINTK1 ND_NOPRINTK |
| 35 | #define ND_PRINTK2 ND_NOPRINTK |
| 36 | #define ND_PRINTK3 ND_NOPRINTK |
| 37 | #if ND_DEBUG >= 1 |
| 38 | #undef ND_PRINTK1 |
| 39 | #define ND_PRINTK1 ND_PRINTK |
| 40 | #endif |
| 41 | #if ND_DEBUG >= 2 |
| 42 | #undef ND_PRINTK2 |
| 43 | #define ND_PRINTK2 ND_PRINTK |
| 44 | #endif |
| 45 | #if ND_DEBUG >= 3 |
| 46 | #undef ND_PRINTK3 |
| 47 | #define ND_PRINTK3 ND_PRINTK |
| 48 | #endif |
| 49 | |
| 50 | #include <linux/module.h> |
| 51 | #include <linux/config.h> |
| 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 | |
| 66 | #include <linux/if_arp.h> |
| 67 | #include <linux/ipv6.h> |
| 68 | #include <linux/icmpv6.h> |
| 69 | #include <linux/jhash.h> |
| 70 | |
| 71 | #include <net/sock.h> |
| 72 | #include <net/snmp.h> |
| 73 | |
| 74 | #include <net/ipv6.h> |
| 75 | #include <net/protocol.h> |
| 76 | #include <net/ndisc.h> |
| 77 | #include <net/ip6_route.h> |
| 78 | #include <net/addrconf.h> |
| 79 | #include <net/icmp.h> |
| 80 | |
| 81 | #include <net/flow.h> |
| 82 | #include <net/ip6_checksum.h> |
| 83 | #include <linux/proc_fs.h> |
| 84 | |
| 85 | #include <linux/netfilter.h> |
| 86 | #include <linux/netfilter_ipv6.h> |
| 87 | |
| 88 | static struct socket *ndisc_socket; |
| 89 | |
| 90 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev); |
| 91 | static int ndisc_constructor(struct neighbour *neigh); |
| 92 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); |
| 93 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); |
| 94 | static int pndisc_constructor(struct pneigh_entry *n); |
| 95 | static void pndisc_destructor(struct pneigh_entry *n); |
| 96 | static void pndisc_redo(struct sk_buff *skb); |
| 97 | |
| 98 | static struct neigh_ops ndisc_generic_ops = { |
| 99 | .family = AF_INET6, |
| 100 | .solicit = ndisc_solicit, |
| 101 | .error_report = ndisc_error_report, |
| 102 | .output = neigh_resolve_output, |
| 103 | .connected_output = neigh_connected_output, |
| 104 | .hh_output = dev_queue_xmit, |
| 105 | .queue_xmit = dev_queue_xmit, |
| 106 | }; |
| 107 | |
| 108 | static struct neigh_ops ndisc_hh_ops = { |
| 109 | .family = AF_INET6, |
| 110 | .solicit = ndisc_solicit, |
| 111 | .error_report = ndisc_error_report, |
| 112 | .output = neigh_resolve_output, |
| 113 | .connected_output = neigh_resolve_output, |
| 114 | .hh_output = dev_queue_xmit, |
| 115 | .queue_xmit = dev_queue_xmit, |
| 116 | }; |
| 117 | |
| 118 | |
| 119 | static struct neigh_ops ndisc_direct_ops = { |
| 120 | .family = AF_INET6, |
| 121 | .output = dev_queue_xmit, |
| 122 | .connected_output = dev_queue_xmit, |
| 123 | .hh_output = dev_queue_xmit, |
| 124 | .queue_xmit = dev_queue_xmit, |
| 125 | }; |
| 126 | |
| 127 | struct neigh_table nd_tbl = { |
| 128 | .family = AF_INET6, |
| 129 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), |
| 130 | .key_len = sizeof(struct in6_addr), |
| 131 | .hash = ndisc_hash, |
| 132 | .constructor = ndisc_constructor, |
| 133 | .pconstructor = pndisc_constructor, |
| 134 | .pdestructor = pndisc_destructor, |
| 135 | .proxy_redo = pndisc_redo, |
| 136 | .id = "ndisc_cache", |
| 137 | .parms = { |
| 138 | .tbl = &nd_tbl, |
| 139 | .base_reachable_time = 30 * HZ, |
| 140 | .retrans_time = 1 * HZ, |
| 141 | .gc_staletime = 60 * HZ, |
| 142 | .reachable_time = 30 * HZ, |
| 143 | .delay_probe_time = 5 * HZ, |
| 144 | .queue_len = 3, |
| 145 | .ucast_probes = 3, |
| 146 | .mcast_probes = 3, |
| 147 | .anycast_delay = 1 * HZ, |
| 148 | .proxy_delay = (8 * HZ) / 10, |
| 149 | .proxy_qlen = 64, |
| 150 | }, |
| 151 | .gc_interval = 30 * HZ, |
| 152 | .gc_thresh1 = 128, |
| 153 | .gc_thresh2 = 512, |
| 154 | .gc_thresh3 = 1024, |
| 155 | }; |
| 156 | |
| 157 | /* ND options */ |
| 158 | struct ndisc_options { |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame^] | 159 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
| 160 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 161 | struct nd_opt_hdr *nd_opts_ri; |
| 162 | struct nd_opt_hdr *nd_opts_ri_end; |
| 163 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | }; |
| 165 | |
| 166 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] |
| 167 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] |
| 168 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] |
| 169 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] |
| 170 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] |
| 171 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] |
| 172 | |
| 173 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) |
| 174 | |
| 175 | /* |
| 176 | * Return the padding between the option length and the start of the |
| 177 | * link addr. Currently only IP-over-InfiniBand needs this, although |
| 178 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may |
| 179 | * also need a pad of 2. |
| 180 | */ |
| 181 | static int ndisc_addr_option_pad(unsigned short type) |
| 182 | { |
| 183 | switch (type) { |
| 184 | case ARPHRD_INFINIBAND: return 2; |
| 185 | default: return 0; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | static inline int ndisc_opt_addr_space(struct net_device *dev) |
| 190 | { |
| 191 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); |
| 192 | } |
| 193 | |
| 194 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, |
| 195 | unsigned short addr_type) |
| 196 | { |
| 197 | int space = NDISC_OPT_SPACE(data_len); |
| 198 | int pad = ndisc_addr_option_pad(addr_type); |
| 199 | |
| 200 | opt[0] = type; |
| 201 | opt[1] = space>>3; |
| 202 | |
| 203 | memset(opt + 2, 0, pad); |
| 204 | opt += pad; |
| 205 | space -= pad; |
| 206 | |
| 207 | memcpy(opt+2, data, data_len); |
| 208 | data_len += 2; |
| 209 | opt += data_len; |
| 210 | if ((space -= data_len) > 0) |
| 211 | memset(opt, 0, space); |
| 212 | return opt + space; |
| 213 | } |
| 214 | |
| 215 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
| 216 | struct nd_opt_hdr *end) |
| 217 | { |
| 218 | int type; |
| 219 | if (!cur || !end || cur >= end) |
| 220 | return NULL; |
| 221 | type = cur->nd_opt_type; |
| 222 | do { |
| 223 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
| 224 | } while(cur < end && cur->nd_opt_type != type); |
| 225 | return (cur <= end && cur->nd_opt_type == type ? cur : NULL); |
| 226 | } |
| 227 | |
| 228 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
| 229 | struct ndisc_options *ndopts) |
| 230 | { |
| 231 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; |
| 232 | |
| 233 | if (!nd_opt || opt_len < 0 || !ndopts) |
| 234 | return NULL; |
| 235 | memset(ndopts, 0, sizeof(*ndopts)); |
| 236 | while (opt_len) { |
| 237 | int l; |
| 238 | if (opt_len < sizeof(struct nd_opt_hdr)) |
| 239 | return NULL; |
| 240 | l = nd_opt->nd_opt_len << 3; |
| 241 | if (opt_len < l || l == 0) |
| 242 | return NULL; |
| 243 | switch (nd_opt->nd_opt_type) { |
| 244 | case ND_OPT_SOURCE_LL_ADDR: |
| 245 | case ND_OPT_TARGET_LL_ADDR: |
| 246 | case ND_OPT_MTU: |
| 247 | case ND_OPT_REDIRECT_HDR: |
| 248 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { |
| 249 | ND_PRINTK2(KERN_WARNING |
| 250 | "%s(): duplicated ND6 option found: type=%d\n", |
| 251 | __FUNCTION__, |
| 252 | nd_opt->nd_opt_type); |
| 253 | } else { |
| 254 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 255 | } |
| 256 | break; |
| 257 | case ND_OPT_PREFIX_INFO: |
| 258 | ndopts->nd_opts_pi_end = nd_opt; |
| 259 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) |
| 260 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 261 | break; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame^] | 262 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 263 | case ND_OPT_ROUTE_INFO: |
| 264 | ndopts->nd_opts_ri_end = nd_opt; |
| 265 | if (!ndopts->nd_opts_ri) |
| 266 | ndopts->nd_opts_ri = nd_opt; |
| 267 | break; |
| 268 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | default: |
| 270 | /* |
| 271 | * Unknown options must be silently ignored, |
| 272 | * to accommodate future extension to the protocol. |
| 273 | */ |
| 274 | ND_PRINTK2(KERN_NOTICE |
| 275 | "%s(): ignored unsupported option; type=%d, len=%d\n", |
| 276 | __FUNCTION__, |
| 277 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); |
| 278 | } |
| 279 | opt_len -= l; |
| 280 | nd_opt = ((void *)nd_opt) + l; |
| 281 | } |
| 282 | return ndopts; |
| 283 | } |
| 284 | |
| 285 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, |
| 286 | struct net_device *dev) |
| 287 | { |
| 288 | u8 *lladdr = (u8 *)(p + 1); |
| 289 | int lladdrlen = p->nd_opt_len << 3; |
| 290 | int prepad = ndisc_addr_option_pad(dev->type); |
| 291 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) |
| 292 | return NULL; |
| 293 | return (lladdr + prepad); |
| 294 | } |
| 295 | |
| 296 | int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
| 297 | { |
| 298 | switch (dev->type) { |
| 299 | case ARPHRD_ETHER: |
| 300 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ |
| 301 | case ARPHRD_FDDI: |
| 302 | ipv6_eth_mc_map(addr, buf); |
| 303 | return 0; |
| 304 | case ARPHRD_IEEE802_TR: |
| 305 | ipv6_tr_mc_map(addr,buf); |
| 306 | return 0; |
| 307 | case ARPHRD_ARCNET: |
| 308 | ipv6_arcnet_mc_map(addr, buf); |
| 309 | return 0; |
| 310 | case ARPHRD_INFINIBAND: |
| 311 | ipv6_ib_mc_map(addr, buf); |
| 312 | return 0; |
| 313 | default: |
| 314 | if (dir) { |
| 315 | memcpy(buf, dev->broadcast, dev->addr_len); |
| 316 | return 0; |
| 317 | } |
| 318 | } |
| 319 | return -EINVAL; |
| 320 | } |
| 321 | |
| 322 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev) |
| 323 | { |
| 324 | const u32 *p32 = pkey; |
| 325 | u32 addr_hash, i; |
| 326 | |
| 327 | addr_hash = 0; |
| 328 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) |
| 329 | addr_hash ^= *p32++; |
| 330 | |
| 331 | return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd); |
| 332 | } |
| 333 | |
| 334 | static int ndisc_constructor(struct neighbour *neigh) |
| 335 | { |
| 336 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; |
| 337 | struct net_device *dev = neigh->dev; |
| 338 | struct inet6_dev *in6_dev; |
| 339 | struct neigh_parms *parms; |
| 340 | int is_multicast = ipv6_addr_is_multicast(addr); |
| 341 | |
| 342 | rcu_read_lock(); |
| 343 | in6_dev = in6_dev_get(dev); |
| 344 | if (in6_dev == NULL) { |
| 345 | rcu_read_unlock(); |
| 346 | return -EINVAL; |
| 347 | } |
| 348 | |
| 349 | parms = in6_dev->nd_parms; |
| 350 | __neigh_parms_put(neigh->parms); |
| 351 | neigh->parms = neigh_parms_clone(parms); |
| 352 | rcu_read_unlock(); |
| 353 | |
| 354 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; |
| 355 | if (dev->hard_header == NULL) { |
| 356 | neigh->nud_state = NUD_NOARP; |
| 357 | neigh->ops = &ndisc_direct_ops; |
| 358 | neigh->output = neigh->ops->queue_xmit; |
| 359 | } else { |
| 360 | if (is_multicast) { |
| 361 | neigh->nud_state = NUD_NOARP; |
| 362 | ndisc_mc_map(addr, neigh->ha, dev, 1); |
| 363 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { |
| 364 | neigh->nud_state = NUD_NOARP; |
| 365 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); |
| 366 | if (dev->flags&IFF_LOOPBACK) |
| 367 | neigh->type = RTN_LOCAL; |
| 368 | } else if (dev->flags&IFF_POINTOPOINT) { |
| 369 | neigh->nud_state = NUD_NOARP; |
| 370 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); |
| 371 | } |
| 372 | if (dev->hard_header_cache) |
| 373 | neigh->ops = &ndisc_hh_ops; |
| 374 | else |
| 375 | neigh->ops = &ndisc_generic_ops; |
| 376 | if (neigh->nud_state&NUD_VALID) |
| 377 | neigh->output = neigh->ops->connected_output; |
| 378 | else |
| 379 | neigh->output = neigh->ops->output; |
| 380 | } |
| 381 | in6_dev_put(in6_dev); |
| 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | static int pndisc_constructor(struct pneigh_entry *n) |
| 386 | { |
| 387 | struct in6_addr *addr = (struct in6_addr*)&n->key; |
| 388 | struct in6_addr maddr; |
| 389 | struct net_device *dev = n->dev; |
| 390 | |
| 391 | if (dev == NULL || __in6_dev_get(dev) == NULL) |
| 392 | return -EINVAL; |
| 393 | addrconf_addr_solict_mult(addr, &maddr); |
| 394 | ipv6_dev_mc_inc(dev, &maddr); |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | static void pndisc_destructor(struct pneigh_entry *n) |
| 399 | { |
| 400 | struct in6_addr *addr = (struct in6_addr*)&n->key; |
| 401 | struct in6_addr maddr; |
| 402 | struct net_device *dev = n->dev; |
| 403 | |
| 404 | if (dev == NULL || __in6_dev_get(dev) == NULL) |
| 405 | return; |
| 406 | addrconf_addr_solict_mult(addr, &maddr); |
| 407 | ipv6_dev_mc_dec(dev, &maddr); |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * Send a Neighbour Advertisement |
| 412 | */ |
| 413 | |
| 414 | static inline void ndisc_flow_init(struct flowi *fl, u8 type, |
| 415 | struct in6_addr *saddr, struct in6_addr *daddr) |
| 416 | { |
| 417 | memset(fl, 0, sizeof(*fl)); |
| 418 | ipv6_addr_copy(&fl->fl6_src, saddr); |
| 419 | ipv6_addr_copy(&fl->fl6_dst, daddr); |
| 420 | fl->proto = IPPROTO_ICMPV6; |
| 421 | fl->fl_icmp_type = type; |
| 422 | fl->fl_icmp_code = 0; |
| 423 | } |
| 424 | |
| 425 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
| 426 | struct in6_addr *daddr, struct in6_addr *solicited_addr, |
| 427 | int router, int solicited, int override, int inc_opt) |
| 428 | { |
| 429 | struct in6_addr tmpaddr; |
| 430 | struct inet6_ifaddr *ifp; |
| 431 | struct inet6_dev *idev; |
| 432 | struct flowi fl; |
| 433 | struct dst_entry* dst; |
| 434 | struct sock *sk = ndisc_socket->sk; |
| 435 | struct in6_addr *src_addr; |
| 436 | struct nd_msg *msg; |
| 437 | int len; |
| 438 | struct sk_buff *skb; |
| 439 | int err; |
| 440 | |
| 441 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); |
| 442 | |
| 443 | /* for anycast or proxy, solicited_addr != src_addr */ |
| 444 | ifp = ipv6_get_ifaddr(solicited_addr, dev, 1); |
| 445 | if (ifp) { |
| 446 | src_addr = solicited_addr; |
| 447 | in6_ifa_put(ifp); |
| 448 | } else { |
| 449 | if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr)) |
| 450 | return; |
| 451 | src_addr = &tmpaddr; |
| 452 | } |
| 453 | |
| 454 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr); |
| 455 | |
| 456 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); |
| 457 | if (!dst) |
| 458 | return; |
| 459 | |
| 460 | err = xfrm_lookup(&dst, &fl, NULL, 0); |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 461 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | if (inc_opt) { |
| 465 | if (dev->addr_len) |
| 466 | len += ndisc_opt_addr_space(dev); |
| 467 | else |
| 468 | inc_opt = 0; |
| 469 | } |
| 470 | |
| 471 | skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), |
| 472 | 1, &err); |
| 473 | |
| 474 | if (skb == NULL) { |
| 475 | ND_PRINTK0(KERN_ERR |
| 476 | "ICMPv6 NA: %s() failed to allocate an skb.\n", |
| 477 | __FUNCTION__); |
| 478 | dst_release(dst); |
| 479 | return; |
| 480 | } |
| 481 | |
| 482 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 483 | ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len); |
| 484 | |
| 485 | msg = (struct nd_msg *)skb_put(skb, len); |
| 486 | skb->h.raw = (unsigned char*)msg; |
| 487 | |
| 488 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; |
| 489 | msg->icmph.icmp6_code = 0; |
| 490 | msg->icmph.icmp6_cksum = 0; |
| 491 | |
| 492 | msg->icmph.icmp6_unused = 0; |
| 493 | msg->icmph.icmp6_router = router; |
| 494 | msg->icmph.icmp6_solicited = solicited; |
| 495 | msg->icmph.icmp6_override = !!override; |
| 496 | |
| 497 | /* Set the target address. */ |
| 498 | ipv6_addr_copy(&msg->target, solicited_addr); |
| 499 | |
| 500 | if (inc_opt) |
| 501 | ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, |
| 502 | dev->addr_len, dev->type); |
| 503 | |
| 504 | /* checksum */ |
| 505 | msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len, |
| 506 | IPPROTO_ICMPV6, |
| 507 | csum_partial((__u8 *) msg, |
| 508 | len, 0)); |
| 509 | |
| 510 | skb->dst = dst; |
| 511 | idev = in6_dev_get(dst->dev); |
| 512 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); |
| 513 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
| 514 | if (!err) { |
| 515 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS); |
| 516 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
| 517 | } |
| 518 | |
| 519 | if (likely(idev != NULL)) |
| 520 | in6_dev_put(idev); |
| 521 | } |
| 522 | |
| 523 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
| 524 | struct in6_addr *solicit, |
| 525 | struct in6_addr *daddr, struct in6_addr *saddr) |
| 526 | { |
| 527 | struct flowi fl; |
| 528 | struct dst_entry* dst; |
| 529 | struct inet6_dev *idev; |
| 530 | struct sock *sk = ndisc_socket->sk; |
| 531 | struct sk_buff *skb; |
| 532 | struct nd_msg *msg; |
| 533 | struct in6_addr addr_buf; |
| 534 | int len; |
| 535 | int err; |
| 536 | int send_llinfo; |
| 537 | |
| 538 | if (saddr == NULL) { |
| 539 | if (ipv6_get_lladdr(dev, &addr_buf)) |
| 540 | return; |
| 541 | saddr = &addr_buf; |
| 542 | } |
| 543 | |
| 544 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr); |
| 545 | |
| 546 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); |
| 547 | if (!dst) |
| 548 | return; |
| 549 | |
| 550 | err = xfrm_lookup(&dst, &fl, NULL, 0); |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 551 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); |
| 555 | send_llinfo = dev->addr_len && !ipv6_addr_any(saddr); |
| 556 | if (send_llinfo) |
| 557 | len += ndisc_opt_addr_space(dev); |
| 558 | |
| 559 | skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), |
| 560 | 1, &err); |
| 561 | if (skb == NULL) { |
| 562 | ND_PRINTK0(KERN_ERR |
| 563 | "ICMPv6 NA: %s() failed to allocate an skb.\n", |
| 564 | __FUNCTION__); |
| 565 | dst_release(dst); |
| 566 | return; |
| 567 | } |
| 568 | |
| 569 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 570 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
| 571 | |
| 572 | msg = (struct nd_msg *)skb_put(skb, len); |
| 573 | skb->h.raw = (unsigned char*)msg; |
| 574 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION; |
| 575 | msg->icmph.icmp6_code = 0; |
| 576 | msg->icmph.icmp6_cksum = 0; |
| 577 | msg->icmph.icmp6_unused = 0; |
| 578 | |
| 579 | /* Set the target address. */ |
| 580 | ipv6_addr_copy(&msg->target, solicit); |
| 581 | |
| 582 | if (send_llinfo) |
| 583 | ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, |
| 584 | dev->addr_len, dev->type); |
| 585 | |
| 586 | /* checksum */ |
| 587 | msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, |
| 588 | daddr, len, |
| 589 | IPPROTO_ICMPV6, |
| 590 | csum_partial((__u8 *) msg, |
| 591 | len, 0)); |
| 592 | /* send it! */ |
| 593 | skb->dst = dst; |
| 594 | idev = in6_dev_get(dst->dev); |
| 595 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); |
| 596 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
| 597 | if (!err) { |
| 598 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS); |
| 599 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
| 600 | } |
| 601 | |
| 602 | if (likely(idev != NULL)) |
| 603 | in6_dev_put(idev); |
| 604 | } |
| 605 | |
| 606 | void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr, |
| 607 | struct in6_addr *daddr) |
| 608 | { |
| 609 | struct flowi fl; |
| 610 | struct dst_entry* dst; |
| 611 | struct inet6_dev *idev; |
| 612 | struct sock *sk = ndisc_socket->sk; |
| 613 | struct sk_buff *skb; |
| 614 | struct icmp6hdr *hdr; |
| 615 | __u8 * opt; |
| 616 | int len; |
| 617 | int err; |
| 618 | |
| 619 | ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr); |
| 620 | |
| 621 | dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output); |
| 622 | if (!dst) |
| 623 | return; |
| 624 | |
| 625 | err = xfrm_lookup(&dst, &fl, NULL, 0); |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 626 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
| 629 | len = sizeof(struct icmp6hdr); |
| 630 | if (dev->addr_len) |
| 631 | len += ndisc_opt_addr_space(dev); |
| 632 | |
| 633 | skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), |
| 634 | 1, &err); |
| 635 | if (skb == NULL) { |
| 636 | ND_PRINTK0(KERN_ERR |
| 637 | "ICMPv6 RS: %s() failed to allocate an skb.\n", |
| 638 | __FUNCTION__); |
| 639 | dst_release(dst); |
| 640 | return; |
| 641 | } |
| 642 | |
| 643 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 644 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
| 645 | |
| 646 | hdr = (struct icmp6hdr *)skb_put(skb, len); |
| 647 | skb->h.raw = (unsigned char*)hdr; |
| 648 | hdr->icmp6_type = NDISC_ROUTER_SOLICITATION; |
| 649 | hdr->icmp6_code = 0; |
| 650 | hdr->icmp6_cksum = 0; |
| 651 | hdr->icmp6_unused = 0; |
| 652 | |
| 653 | opt = (u8*) (hdr + 1); |
| 654 | |
| 655 | if (dev->addr_len) |
| 656 | ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, |
| 657 | dev->addr_len, dev->type); |
| 658 | |
| 659 | /* checksum */ |
| 660 | hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len, |
| 661 | IPPROTO_ICMPV6, |
| 662 | csum_partial((__u8 *) hdr, len, 0)); |
| 663 | |
| 664 | /* send it! */ |
| 665 | skb->dst = dst; |
| 666 | idev = in6_dev_get(dst->dev); |
| 667 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); |
| 668 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
| 669 | if (!err) { |
| 670 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS); |
| 671 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
| 672 | } |
| 673 | |
| 674 | if (likely(idev != NULL)) |
| 675 | in6_dev_put(idev); |
| 676 | } |
| 677 | |
| 678 | |
| 679 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) |
| 680 | { |
| 681 | /* |
| 682 | * "The sender MUST return an ICMP |
| 683 | * destination unreachable" |
| 684 | */ |
| 685 | dst_link_failure(skb); |
| 686 | kfree_skb(skb); |
| 687 | } |
| 688 | |
| 689 | /* Called with locked neigh: either read or both */ |
| 690 | |
| 691 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) |
| 692 | { |
| 693 | struct in6_addr *saddr = NULL; |
| 694 | struct in6_addr mcaddr; |
| 695 | struct net_device *dev = neigh->dev; |
| 696 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; |
| 697 | int probes = atomic_read(&neigh->probes); |
| 698 | |
| 699 | if (skb && ipv6_chk_addr(&skb->nh.ipv6h->saddr, dev, 1)) |
| 700 | saddr = &skb->nh.ipv6h->saddr; |
| 701 | |
| 702 | if ((probes -= neigh->parms->ucast_probes) < 0) { |
| 703 | if (!(neigh->nud_state & NUD_VALID)) { |
| 704 | ND_PRINTK1(KERN_DEBUG |
| 705 | "%s(): trying to ucast probe in NUD_INVALID: " |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 706 | NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | __FUNCTION__, |
| 708 | NIP6(*target)); |
| 709 | } |
| 710 | ndisc_send_ns(dev, neigh, target, target, saddr); |
| 711 | } else if ((probes -= neigh->parms->app_probes) < 0) { |
| 712 | #ifdef CONFIG_ARPD |
| 713 | neigh_app_ns(neigh); |
| 714 | #endif |
| 715 | } else { |
| 716 | addrconf_addr_solict_mult(target, &mcaddr); |
| 717 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | static void ndisc_recv_ns(struct sk_buff *skb) |
| 722 | { |
| 723 | struct nd_msg *msg = (struct nd_msg *)skb->h.raw; |
| 724 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; |
| 725 | struct in6_addr *daddr = &skb->nh.ipv6h->daddr; |
| 726 | u8 *lladdr = NULL; |
| 727 | u32 ndoptlen = skb->tail - msg->opt; |
| 728 | struct ndisc_options ndopts; |
| 729 | struct net_device *dev = skb->dev; |
| 730 | struct inet6_ifaddr *ifp; |
| 731 | struct inet6_dev *idev = NULL; |
| 732 | struct neighbour *neigh; |
| 733 | int dad = ipv6_addr_any(saddr); |
| 734 | int inc; |
| 735 | |
| 736 | if (ipv6_addr_is_multicast(&msg->target)) { |
| 737 | ND_PRINTK2(KERN_WARNING |
| 738 | "ICMPv6 NS: multicast target address"); |
| 739 | return; |
| 740 | } |
| 741 | |
| 742 | /* |
| 743 | * RFC2461 7.1.1: |
| 744 | * DAD has to be destined for solicited node multicast address. |
| 745 | */ |
| 746 | if (dad && |
| 747 | !(daddr->s6_addr32[0] == htonl(0xff020000) && |
| 748 | daddr->s6_addr32[1] == htonl(0x00000000) && |
| 749 | daddr->s6_addr32[2] == htonl(0x00000001) && |
| 750 | daddr->s6_addr [12] == 0xff )) { |
| 751 | ND_PRINTK2(KERN_WARNING |
| 752 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); |
| 753 | return; |
| 754 | } |
| 755 | |
| 756 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
| 757 | ND_PRINTK2(KERN_WARNING |
| 758 | "ICMPv6 NS: invalid ND options\n"); |
| 759 | return; |
| 760 | } |
| 761 | |
| 762 | if (ndopts.nd_opts_src_lladdr) { |
| 763 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); |
| 764 | if (!lladdr) { |
| 765 | ND_PRINTK2(KERN_WARNING |
| 766 | "ICMPv6 NS: invalid link-layer address length\n"); |
| 767 | return; |
| 768 | } |
| 769 | |
| 770 | /* RFC2461 7.1.1: |
| 771 | * If the IP source address is the unspecified address, |
| 772 | * there MUST NOT be source link-layer address option |
| 773 | * in the message. |
| 774 | */ |
| 775 | if (dad) { |
| 776 | ND_PRINTK2(KERN_WARNING |
| 777 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
| 778 | return; |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | inc = ipv6_addr_is_multicast(daddr); |
| 783 | |
| 784 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) { |
| 785 | if (ifp->flags & IFA_F_TENTATIVE) { |
| 786 | /* Address is tentative. If the source |
| 787 | is unspecified address, it is someone |
| 788 | does DAD, otherwise we ignore solicitations |
| 789 | until DAD timer expires. |
| 790 | */ |
| 791 | if (!dad) |
| 792 | goto out; |
| 793 | if (dev->type == ARPHRD_IEEE802_TR) { |
| 794 | unsigned char *sadr = skb->mac.raw; |
| 795 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
| 796 | sadr[9] == dev->dev_addr[1] && |
| 797 | sadr[10] == dev->dev_addr[2] && |
| 798 | sadr[11] == dev->dev_addr[3] && |
| 799 | sadr[12] == dev->dev_addr[4] && |
| 800 | sadr[13] == dev->dev_addr[5]) { |
| 801 | /* looped-back to us */ |
| 802 | goto out; |
| 803 | } |
| 804 | } |
| 805 | addrconf_dad_failure(ifp); |
| 806 | return; |
| 807 | } |
| 808 | |
| 809 | idev = ifp->idev; |
| 810 | } else { |
| 811 | idev = in6_dev_get(dev); |
| 812 | if (!idev) { |
| 813 | /* XXX: count this drop? */ |
| 814 | return; |
| 815 | } |
| 816 | |
| 817 | if (ipv6_chk_acast_addr(dev, &msg->target) || |
| 818 | (idev->cnf.forwarding && |
| 819 | pneigh_lookup(&nd_tbl, &msg->target, dev, 0))) { |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 820 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | skb->pkt_type != PACKET_HOST && |
| 822 | inc != 0 && |
| 823 | idev->nd_parms->proxy_delay != 0) { |
| 824 | /* |
| 825 | * for anycast or proxy, |
| 826 | * sender should delay its response |
| 827 | * by a random time between 0 and |
| 828 | * MAX_ANYCAST_DELAY_TIME seconds. |
| 829 | * (RFC2461) -- yoshfuji |
| 830 | */ |
| 831 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); |
| 832 | if (n) |
| 833 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); |
| 834 | goto out; |
| 835 | } |
| 836 | } else |
| 837 | goto out; |
| 838 | } |
| 839 | |
| 840 | if (dad) { |
| 841 | struct in6_addr maddr; |
| 842 | |
| 843 | ipv6_addr_all_nodes(&maddr); |
| 844 | ndisc_send_na(dev, NULL, &maddr, &msg->target, |
| 845 | idev->cnf.forwarding, 0, (ifp != NULL), 1); |
| 846 | goto out; |
| 847 | } |
| 848 | |
| 849 | if (inc) |
| 850 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); |
| 851 | else |
| 852 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); |
| 853 | |
| 854 | /* |
| 855 | * update / create cache entry |
| 856 | * for the source address |
| 857 | */ |
| 858 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, |
| 859 | !inc || lladdr || !dev->addr_len); |
| 860 | if (neigh) |
| 861 | neigh_update(neigh, lladdr, NUD_STALE, |
| 862 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 863 | NEIGH_UPDATE_F_OVERRIDE); |
| 864 | if (neigh || !dev->hard_header) { |
| 865 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
| 866 | idev->cnf.forwarding, |
| 867 | 1, (ifp != NULL && inc), inc); |
| 868 | if (neigh) |
| 869 | neigh_release(neigh); |
| 870 | } |
| 871 | |
| 872 | out: |
| 873 | if (ifp) |
| 874 | in6_ifa_put(ifp); |
| 875 | else |
| 876 | in6_dev_put(idev); |
| 877 | |
| 878 | return; |
| 879 | } |
| 880 | |
| 881 | static void ndisc_recv_na(struct sk_buff *skb) |
| 882 | { |
| 883 | struct nd_msg *msg = (struct nd_msg *)skb->h.raw; |
| 884 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; |
| 885 | struct in6_addr *daddr = &skb->nh.ipv6h->daddr; |
| 886 | u8 *lladdr = NULL; |
| 887 | u32 ndoptlen = skb->tail - msg->opt; |
| 888 | struct ndisc_options ndopts; |
| 889 | struct net_device *dev = skb->dev; |
| 890 | struct inet6_ifaddr *ifp; |
| 891 | struct neighbour *neigh; |
| 892 | |
| 893 | if (skb->len < sizeof(struct nd_msg)) { |
| 894 | ND_PRINTK2(KERN_WARNING |
| 895 | "ICMPv6 NA: packet too short\n"); |
| 896 | return; |
| 897 | } |
| 898 | |
| 899 | if (ipv6_addr_is_multicast(&msg->target)) { |
| 900 | ND_PRINTK2(KERN_WARNING |
| 901 | "ICMPv6 NA: target address is multicast.\n"); |
| 902 | return; |
| 903 | } |
| 904 | |
| 905 | if (ipv6_addr_is_multicast(daddr) && |
| 906 | msg->icmph.icmp6_solicited) { |
| 907 | ND_PRINTK2(KERN_WARNING |
| 908 | "ICMPv6 NA: solicited NA is multicasted.\n"); |
| 909 | return; |
| 910 | } |
| 911 | |
| 912 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
| 913 | ND_PRINTK2(KERN_WARNING |
| 914 | "ICMPv6 NS: invalid ND option\n"); |
| 915 | return; |
| 916 | } |
| 917 | if (ndopts.nd_opts_tgt_lladdr) { |
| 918 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); |
| 919 | if (!lladdr) { |
| 920 | ND_PRINTK2(KERN_WARNING |
| 921 | "ICMPv6 NA: invalid link-layer address length\n"); |
| 922 | return; |
| 923 | } |
| 924 | } |
| 925 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) { |
| 926 | if (ifp->flags & IFA_F_TENTATIVE) { |
| 927 | addrconf_dad_failure(ifp); |
| 928 | return; |
| 929 | } |
| 930 | /* What should we make now? The advertisement |
| 931 | is invalid, but ndisc specs say nothing |
| 932 | about it. It could be misconfiguration, or |
| 933 | an smart proxy agent tries to help us :-) |
| 934 | */ |
| 935 | ND_PRINTK1(KERN_WARNING |
| 936 | "ICMPv6 NA: someone advertises our address on %s!\n", |
| 937 | ifp->idev->dev->name); |
| 938 | in6_ifa_put(ifp); |
| 939 | return; |
| 940 | } |
| 941 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); |
| 942 | |
| 943 | if (neigh) { |
| 944 | u8 old_flags = neigh->flags; |
| 945 | |
| 946 | if (neigh->nud_state & NUD_FAILED) |
| 947 | goto out; |
| 948 | |
| 949 | neigh_update(neigh, lladdr, |
| 950 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
| 951 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 952 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| |
| 953 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 954 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); |
| 955 | |
| 956 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { |
| 957 | /* |
| 958 | * Change: router to host |
| 959 | */ |
| 960 | struct rt6_info *rt; |
| 961 | rt = rt6_get_dflt_router(saddr, dev); |
| 962 | if (rt) |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 963 | ip6_del_rt(rt, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | out: |
| 967 | neigh_release(neigh); |
| 968 | } |
| 969 | } |
| 970 | |
| 971 | static void ndisc_recv_rs(struct sk_buff *skb) |
| 972 | { |
| 973 | struct rs_msg *rs_msg = (struct rs_msg *) skb->h.raw; |
| 974 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
| 975 | struct neighbour *neigh; |
| 976 | struct inet6_dev *idev; |
| 977 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; |
| 978 | struct ndisc_options ndopts; |
| 979 | u8 *lladdr = NULL; |
| 980 | |
| 981 | if (skb->len < sizeof(*rs_msg)) |
| 982 | return; |
| 983 | |
| 984 | idev = in6_dev_get(skb->dev); |
| 985 | if (!idev) { |
| 986 | if (net_ratelimit()) |
| 987 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); |
| 988 | return; |
| 989 | } |
| 990 | |
| 991 | /* Don't accept RS if we're not in router mode */ |
| 992 | if (!idev->cnf.forwarding) |
| 993 | goto out; |
| 994 | |
| 995 | /* |
| 996 | * Don't update NCE if src = ::; |
| 997 | * this implies that the source node has no ip address assigned yet. |
| 998 | */ |
| 999 | if (ipv6_addr_any(saddr)) |
| 1000 | goto out; |
| 1001 | |
| 1002 | /* Parse ND options */ |
| 1003 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { |
| 1004 | if (net_ratelimit()) |
| 1005 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); |
| 1006 | goto out; |
| 1007 | } |
| 1008 | |
| 1009 | if (ndopts.nd_opts_src_lladdr) { |
| 1010 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 1011 | skb->dev); |
| 1012 | if (!lladdr) |
| 1013 | goto out; |
| 1014 | } |
| 1015 | |
| 1016 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); |
| 1017 | if (neigh) { |
| 1018 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1019 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1020 | NEIGH_UPDATE_F_OVERRIDE| |
| 1021 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); |
| 1022 | neigh_release(neigh); |
| 1023 | } |
| 1024 | out: |
| 1025 | in6_dev_put(idev); |
| 1026 | } |
| 1027 | |
| 1028 | static void ndisc_router_discovery(struct sk_buff *skb) |
| 1029 | { |
| 1030 | struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw; |
| 1031 | struct neighbour *neigh = NULL; |
| 1032 | struct inet6_dev *in6_dev; |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1033 | struct rt6_info *rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | int lifetime; |
| 1035 | struct ndisc_options ndopts; |
| 1036 | int optlen; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1037 | unsigned int pref = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | __u8 * opt = (__u8 *)(ra_msg + 1); |
| 1040 | |
| 1041 | optlen = (skb->tail - skb->h.raw) - sizeof(struct ra_msg); |
| 1042 | |
| 1043 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) { |
| 1044 | ND_PRINTK2(KERN_WARNING |
| 1045 | "ICMPv6 RA: source address is not link-local.\n"); |
| 1046 | return; |
| 1047 | } |
| 1048 | if (optlen < 0) { |
| 1049 | ND_PRINTK2(KERN_WARNING |
| 1050 | "ICMPv6 RA: packet too short\n"); |
| 1051 | return; |
| 1052 | } |
| 1053 | |
| 1054 | /* |
| 1055 | * set the RA_RECV flag in the interface |
| 1056 | */ |
| 1057 | |
| 1058 | in6_dev = in6_dev_get(skb->dev); |
| 1059 | if (in6_dev == NULL) { |
| 1060 | ND_PRINTK0(KERN_ERR |
| 1061 | "ICMPv6 RA: can't find inet6 device for %s.\n", |
| 1062 | skb->dev->name); |
| 1063 | return; |
| 1064 | } |
| 1065 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) { |
| 1066 | in6_dev_put(in6_dev); |
| 1067 | return; |
| 1068 | } |
| 1069 | |
| 1070 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { |
| 1071 | in6_dev_put(in6_dev); |
| 1072 | ND_PRINTK2(KERN_WARNING |
| 1073 | "ICMP6 RA: invalid ND options\n"); |
| 1074 | return; |
| 1075 | } |
| 1076 | |
| 1077 | if (in6_dev->if_flags & IF_RS_SENT) { |
| 1078 | /* |
| 1079 | * flag that an RA was received after an RS was sent |
| 1080 | * out on this interface. |
| 1081 | */ |
| 1082 | in6_dev->if_flags |= IF_RA_RCVD; |
| 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * Remember the managed/otherconf flags from most recently |
| 1087 | * received RA message (RFC 2462) -- yoshfuji |
| 1088 | */ |
| 1089 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
| 1090 | IF_RA_OTHERCONF)) | |
| 1091 | (ra_msg->icmph.icmp6_addrconf_managed ? |
| 1092 | IF_RA_MANAGED : 0) | |
| 1093 | (ra_msg->icmph.icmp6_addrconf_other ? |
| 1094 | IF_RA_OTHERCONF : 0); |
| 1095 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1096 | if (!in6_dev->cnf.accept_ra_defrtr) |
| 1097 | goto skip_defrtr; |
| 1098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
| 1100 | |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1101 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 1102 | pref = ra_msg->icmph.icmp6_router_pref; |
| 1103 | /* 10b is handled as if it were 00b (medium) */ |
YOSHIFUJI Hideaki | 930d6ff | 2006-03-20 17:05:30 -0800 | [diff] [blame] | 1104 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
| 1105 | in6_dev->cnf.accept_ra_rtr_pref) |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1106 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
| 1107 | #endif |
| 1108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev); |
| 1110 | |
| 1111 | if (rt) |
| 1112 | neigh = rt->rt6i_nexthop; |
| 1113 | |
| 1114 | if (rt && lifetime == 0) { |
| 1115 | neigh_clone(neigh); |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1116 | ip6_del_rt(rt, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | rt = NULL; |
| 1118 | } |
| 1119 | |
| 1120 | if (rt == NULL && lifetime) { |
| 1121 | ND_PRINTK3(KERN_DEBUG |
| 1122 | "ICMPv6 RA: adding default router.\n"); |
| 1123 | |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1124 | rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | if (rt == NULL) { |
| 1126 | ND_PRINTK0(KERN_ERR |
| 1127 | "ICMPv6 RA: %s() failed to add default route.\n", |
| 1128 | __FUNCTION__); |
| 1129 | in6_dev_put(in6_dev); |
| 1130 | return; |
| 1131 | } |
| 1132 | |
| 1133 | neigh = rt->rt6i_nexthop; |
| 1134 | if (neigh == NULL) { |
| 1135 | ND_PRINTK0(KERN_ERR |
| 1136 | "ICMPv6 RA: %s() got default router without neighbour.\n", |
| 1137 | __FUNCTION__); |
| 1138 | dst_release(&rt->u.dst); |
| 1139 | in6_dev_put(in6_dev); |
| 1140 | return; |
| 1141 | } |
| 1142 | neigh->flags |= NTF_ROUTER; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1143 | } else if (rt) { |
| 1144 | rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | } |
| 1146 | |
| 1147 | if (rt) |
| 1148 | rt->rt6i_expires = jiffies + (HZ * lifetime); |
| 1149 | |
| 1150 | if (ra_msg->icmph.icmp6_hop_limit) { |
| 1151 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
| 1152 | if (rt) |
| 1153 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; |
| 1154 | } |
| 1155 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1156 | skip_defrtr: |
| 1157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | /* |
| 1159 | * Update Reachable Time and Retrans Timer |
| 1160 | */ |
| 1161 | |
| 1162 | if (in6_dev->nd_parms) { |
| 1163 | unsigned long rtime = ntohl(ra_msg->retrans_timer); |
| 1164 | |
| 1165 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { |
| 1166 | rtime = (rtime*HZ)/1000; |
| 1167 | if (rtime < HZ/10) |
| 1168 | rtime = HZ/10; |
| 1169 | in6_dev->nd_parms->retrans_time = rtime; |
| 1170 | in6_dev->tstamp = jiffies; |
| 1171 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1172 | } |
| 1173 | |
| 1174 | rtime = ntohl(ra_msg->reachable_time); |
| 1175 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { |
| 1176 | rtime = (rtime*HZ)/1000; |
| 1177 | |
| 1178 | if (rtime < HZ/10) |
| 1179 | rtime = HZ/10; |
| 1180 | |
| 1181 | if (rtime != in6_dev->nd_parms->base_reachable_time) { |
| 1182 | in6_dev->nd_parms->base_reachable_time = rtime; |
| 1183 | in6_dev->nd_parms->gc_staletime = 3 * rtime; |
| 1184 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
| 1185 | in6_dev->tstamp = jiffies; |
| 1186 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1187 | } |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | /* |
| 1192 | * Process options. |
| 1193 | */ |
| 1194 | |
| 1195 | if (!neigh) |
| 1196 | neigh = __neigh_lookup(&nd_tbl, &skb->nh.ipv6h->saddr, |
| 1197 | skb->dev, 1); |
| 1198 | if (neigh) { |
| 1199 | u8 *lladdr = NULL; |
| 1200 | if (ndopts.nd_opts_src_lladdr) { |
| 1201 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 1202 | skb->dev); |
| 1203 | if (!lladdr) { |
| 1204 | ND_PRINTK2(KERN_WARNING |
| 1205 | "ICMPv6 RA: invalid link-layer address length\n"); |
| 1206 | goto out; |
| 1207 | } |
| 1208 | } |
| 1209 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1210 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1211 | NEIGH_UPDATE_F_OVERRIDE| |
| 1212 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1213 | NEIGH_UPDATE_F_ISROUTER); |
| 1214 | } |
| 1215 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame^] | 1216 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 1217 | if (ndopts.nd_opts_ri) { |
| 1218 | struct nd_opt_hdr *p; |
| 1219 | for (p = ndopts.nd_opts_ri; |
| 1220 | p; |
| 1221 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { |
| 1222 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
| 1223 | &skb->nh.ipv6h->saddr); |
| 1224 | } |
| 1225 | } |
| 1226 | #endif |
| 1227 | |
YOSHIFUJI Hideaki | c4fd30e | 2006-03-20 16:55:26 -0800 | [diff] [blame] | 1228 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | struct nd_opt_hdr *p; |
| 1230 | for (p = ndopts.nd_opts_pi; |
| 1231 | p; |
| 1232 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { |
| 1233 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); |
| 1234 | } |
| 1235 | } |
| 1236 | |
| 1237 | if (ndopts.nd_opts_mtu) { |
| 1238 | u32 mtu; |
| 1239 | |
| 1240 | memcpy(&mtu, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
| 1241 | mtu = ntohl(mtu); |
| 1242 | |
| 1243 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { |
| 1244 | ND_PRINTK2(KERN_WARNING |
| 1245 | "ICMPv6 RA: invalid mtu: %d\n", |
| 1246 | mtu); |
| 1247 | } else if (in6_dev->cnf.mtu6 != mtu) { |
| 1248 | in6_dev->cnf.mtu6 = mtu; |
| 1249 | |
| 1250 | if (rt) |
| 1251 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; |
| 1252 | |
| 1253 | rt6_mtu_change(skb->dev, mtu); |
| 1254 | } |
| 1255 | } |
| 1256 | |
| 1257 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
| 1258 | ND_PRINTK2(KERN_WARNING |
| 1259 | "ICMPv6 RA: invalid RA options"); |
| 1260 | } |
| 1261 | out: |
| 1262 | if (rt) |
| 1263 | dst_release(&rt->u.dst); |
| 1264 | else if (neigh) |
| 1265 | neigh_release(neigh); |
| 1266 | in6_dev_put(in6_dev); |
| 1267 | } |
| 1268 | |
| 1269 | static void ndisc_redirect_rcv(struct sk_buff *skb) |
| 1270 | { |
| 1271 | struct inet6_dev *in6_dev; |
| 1272 | struct icmp6hdr *icmph; |
| 1273 | struct in6_addr *dest; |
| 1274 | struct in6_addr *target; /* new first hop to destination */ |
| 1275 | struct neighbour *neigh; |
| 1276 | int on_link = 0; |
| 1277 | struct ndisc_options ndopts; |
| 1278 | int optlen; |
| 1279 | u8 *lladdr = NULL; |
| 1280 | |
| 1281 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) { |
| 1282 | ND_PRINTK2(KERN_WARNING |
| 1283 | "ICMPv6 Redirect: source address is not link-local.\n"); |
| 1284 | return; |
| 1285 | } |
| 1286 | |
| 1287 | optlen = skb->tail - skb->h.raw; |
| 1288 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
| 1289 | |
| 1290 | if (optlen < 0) { |
| 1291 | ND_PRINTK2(KERN_WARNING |
| 1292 | "ICMPv6 Redirect: packet too short\n"); |
| 1293 | return; |
| 1294 | } |
| 1295 | |
| 1296 | icmph = (struct icmp6hdr *) skb->h.raw; |
| 1297 | target = (struct in6_addr *) (icmph + 1); |
| 1298 | dest = target + 1; |
| 1299 | |
| 1300 | if (ipv6_addr_is_multicast(dest)) { |
| 1301 | ND_PRINTK2(KERN_WARNING |
| 1302 | "ICMPv6 Redirect: destination address is multicast.\n"); |
| 1303 | return; |
| 1304 | } |
| 1305 | |
| 1306 | if (ipv6_addr_equal(dest, target)) { |
| 1307 | on_link = 1; |
| 1308 | } else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) { |
| 1309 | ND_PRINTK2(KERN_WARNING |
| 1310 | "ICMPv6 Redirect: target address is not link-local.\n"); |
| 1311 | return; |
| 1312 | } |
| 1313 | |
| 1314 | in6_dev = in6_dev_get(skb->dev); |
| 1315 | if (!in6_dev) |
| 1316 | return; |
| 1317 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { |
| 1318 | in6_dev_put(in6_dev); |
| 1319 | return; |
| 1320 | } |
| 1321 | |
| 1322 | /* RFC2461 8.1: |
| 1323 | * The IP source address of the Redirect MUST be the same as the current |
| 1324 | * first-hop router for the specified ICMP Destination Address. |
| 1325 | */ |
| 1326 | |
| 1327 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
| 1328 | ND_PRINTK2(KERN_WARNING |
| 1329 | "ICMPv6 Redirect: invalid ND options\n"); |
| 1330 | in6_dev_put(in6_dev); |
| 1331 | return; |
| 1332 | } |
| 1333 | if (ndopts.nd_opts_tgt_lladdr) { |
| 1334 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, |
| 1335 | skb->dev); |
| 1336 | if (!lladdr) { |
| 1337 | ND_PRINTK2(KERN_WARNING |
| 1338 | "ICMPv6 Redirect: invalid link-layer address length\n"); |
| 1339 | in6_dev_put(in6_dev); |
| 1340 | return; |
| 1341 | } |
| 1342 | } |
| 1343 | |
| 1344 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); |
| 1345 | if (neigh) { |
| 1346 | rt6_redirect(dest, &skb->nh.ipv6h->saddr, neigh, lladdr, |
| 1347 | on_link); |
| 1348 | neigh_release(neigh); |
| 1349 | } |
| 1350 | in6_dev_put(in6_dev); |
| 1351 | } |
| 1352 | |
| 1353 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, |
| 1354 | struct in6_addr *target) |
| 1355 | { |
| 1356 | struct sock *sk = ndisc_socket->sk; |
| 1357 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
| 1358 | struct sk_buff *buff; |
| 1359 | struct icmp6hdr *icmph; |
| 1360 | struct in6_addr saddr_buf; |
| 1361 | struct in6_addr *addrp; |
| 1362 | struct net_device *dev; |
| 1363 | struct rt6_info *rt; |
| 1364 | struct dst_entry *dst; |
| 1365 | struct inet6_dev *idev; |
| 1366 | struct flowi fl; |
| 1367 | u8 *opt; |
| 1368 | int rd_len; |
| 1369 | int err; |
| 1370 | int hlen; |
| 1371 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
| 1372 | |
| 1373 | dev = skb->dev; |
| 1374 | |
| 1375 | if (ipv6_get_lladdr(dev, &saddr_buf)) { |
| 1376 | ND_PRINTK2(KERN_WARNING |
| 1377 | "ICMPv6 Redirect: no link-local address on %s\n", |
| 1378 | dev->name); |
| 1379 | return; |
| 1380 | } |
| 1381 | |
| 1382 | ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &skb->nh.ipv6h->saddr); |
| 1383 | |
| 1384 | dst = ip6_route_output(NULL, &fl); |
| 1385 | if (dst == NULL) |
| 1386 | return; |
| 1387 | |
| 1388 | err = xfrm_lookup(&dst, &fl, NULL, 0); |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 1389 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | |
| 1392 | rt = (struct rt6_info *) dst; |
| 1393 | |
| 1394 | if (rt->rt6i_flags & RTF_GATEWAY) { |
| 1395 | ND_PRINTK2(KERN_WARNING |
| 1396 | "ICMPv6 Redirect: destination is not a neighbour.\n"); |
| 1397 | dst_release(dst); |
| 1398 | return; |
| 1399 | } |
| 1400 | if (!xrlim_allow(dst, 1*HZ)) { |
| 1401 | dst_release(dst); |
| 1402 | return; |
| 1403 | } |
| 1404 | |
| 1405 | if (dev->addr_len) { |
| 1406 | read_lock_bh(&neigh->lock); |
| 1407 | if (neigh->nud_state & NUD_VALID) { |
| 1408 | memcpy(ha_buf, neigh->ha, dev->addr_len); |
| 1409 | read_unlock_bh(&neigh->lock); |
| 1410 | ha = ha_buf; |
| 1411 | len += ndisc_opt_addr_space(dev); |
| 1412 | } else |
| 1413 | read_unlock_bh(&neigh->lock); |
| 1414 | } |
| 1415 | |
| 1416 | rd_len = min_t(unsigned int, |
| 1417 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); |
| 1418 | rd_len &= ~0x7; |
| 1419 | len += rd_len; |
| 1420 | |
| 1421 | buff = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), |
| 1422 | 1, &err); |
| 1423 | if (buff == NULL) { |
| 1424 | ND_PRINTK0(KERN_ERR |
| 1425 | "ICMPv6 Redirect: %s() failed to allocate an skb.\n", |
| 1426 | __FUNCTION__); |
| 1427 | dst_release(dst); |
| 1428 | return; |
| 1429 | } |
| 1430 | |
| 1431 | hlen = 0; |
| 1432 | |
| 1433 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); |
| 1434 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr, |
| 1435 | IPPROTO_ICMPV6, len); |
| 1436 | |
| 1437 | icmph = (struct icmp6hdr *)skb_put(buff, len); |
| 1438 | buff->h.raw = (unsigned char*)icmph; |
| 1439 | |
| 1440 | memset(icmph, 0, sizeof(struct icmp6hdr)); |
| 1441 | icmph->icmp6_type = NDISC_REDIRECT; |
| 1442 | |
| 1443 | /* |
| 1444 | * copy target and destination addresses |
| 1445 | */ |
| 1446 | |
| 1447 | addrp = (struct in6_addr *)(icmph + 1); |
| 1448 | ipv6_addr_copy(addrp, target); |
| 1449 | addrp++; |
| 1450 | ipv6_addr_copy(addrp, &skb->nh.ipv6h->daddr); |
| 1451 | |
| 1452 | opt = (u8*) (addrp + 1); |
| 1453 | |
| 1454 | /* |
| 1455 | * include target_address option |
| 1456 | */ |
| 1457 | |
| 1458 | if (ha) |
| 1459 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, |
| 1460 | dev->addr_len, dev->type); |
| 1461 | |
| 1462 | /* |
| 1463 | * build redirect option and copy skb over to the new packet. |
| 1464 | */ |
| 1465 | |
| 1466 | memset(opt, 0, 8); |
| 1467 | *(opt++) = ND_OPT_REDIRECT_HDR; |
| 1468 | *(opt++) = (rd_len >> 3); |
| 1469 | opt += 6; |
| 1470 | |
| 1471 | memcpy(opt, skb->nh.ipv6h, rd_len - 8); |
| 1472 | |
| 1473 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &skb->nh.ipv6h->saddr, |
| 1474 | len, IPPROTO_ICMPV6, |
| 1475 | csum_partial((u8 *) icmph, len, 0)); |
| 1476 | |
| 1477 | buff->dst = dst; |
| 1478 | idev = in6_dev_get(dst->dev); |
| 1479 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); |
| 1480 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output); |
| 1481 | if (!err) { |
| 1482 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS); |
| 1483 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
| 1484 | } |
| 1485 | |
| 1486 | if (likely(idev != NULL)) |
| 1487 | in6_dev_put(idev); |
| 1488 | } |
| 1489 | |
| 1490 | static void pndisc_redo(struct sk_buff *skb) |
| 1491 | { |
YOSHIFUJI Hideaki | 140e26fc | 2005-10-05 12:11:41 -0700 | [diff] [blame] | 1492 | ndisc_recv_ns(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | kfree_skb(skb); |
| 1494 | } |
| 1495 | |
| 1496 | int ndisc_rcv(struct sk_buff *skb) |
| 1497 | { |
| 1498 | struct nd_msg *msg; |
| 1499 | |
| 1500 | if (!pskb_may_pull(skb, skb->len)) |
| 1501 | return 0; |
| 1502 | |
| 1503 | msg = (struct nd_msg *) skb->h.raw; |
| 1504 | |
| 1505 | __skb_push(skb, skb->data-skb->h.raw); |
| 1506 | |
| 1507 | if (skb->nh.ipv6h->hop_limit != 255) { |
| 1508 | ND_PRINTK2(KERN_WARNING |
| 1509 | "ICMPv6 NDISC: invalid hop-limit: %d\n", |
| 1510 | skb->nh.ipv6h->hop_limit); |
| 1511 | return 0; |
| 1512 | } |
| 1513 | |
| 1514 | if (msg->icmph.icmp6_code != 0) { |
| 1515 | ND_PRINTK2(KERN_WARNING |
| 1516 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
| 1517 | msg->icmph.icmp6_code); |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1521 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
| 1522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | switch (msg->icmph.icmp6_type) { |
| 1524 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 1525 | ndisc_recv_ns(skb); |
| 1526 | break; |
| 1527 | |
| 1528 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 1529 | ndisc_recv_na(skb); |
| 1530 | break; |
| 1531 | |
| 1532 | case NDISC_ROUTER_SOLICITATION: |
| 1533 | ndisc_recv_rs(skb); |
| 1534 | break; |
| 1535 | |
| 1536 | case NDISC_ROUTER_ADVERTISEMENT: |
| 1537 | ndisc_router_discovery(skb); |
| 1538 | break; |
| 1539 | |
| 1540 | case NDISC_REDIRECT: |
| 1541 | ndisc_redirect_rcv(skb); |
| 1542 | break; |
| 1543 | }; |
| 1544 | |
| 1545 | return 0; |
| 1546 | } |
| 1547 | |
| 1548 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1549 | { |
| 1550 | struct net_device *dev = ptr; |
| 1551 | |
| 1552 | switch (event) { |
| 1553 | case NETDEV_CHANGEADDR: |
| 1554 | neigh_changeaddr(&nd_tbl, dev); |
| 1555 | fib6_run_gc(~0UL); |
| 1556 | break; |
| 1557 | case NETDEV_DOWN: |
| 1558 | neigh_ifdown(&nd_tbl, dev); |
| 1559 | fib6_run_gc(~0UL); |
| 1560 | break; |
| 1561 | default: |
| 1562 | break; |
| 1563 | } |
| 1564 | |
| 1565 | return NOTIFY_DONE; |
| 1566 | } |
| 1567 | |
| 1568 | static struct notifier_block ndisc_netdev_notifier = { |
| 1569 | .notifier_call = ndisc_netdev_event, |
| 1570 | }; |
| 1571 | |
| 1572 | #ifdef CONFIG_SYSCTL |
| 1573 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, |
| 1574 | const char *func, const char *dev_name) |
| 1575 | { |
| 1576 | static char warncomm[TASK_COMM_LEN]; |
| 1577 | static int warned; |
| 1578 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 1579 | strcpy(warncomm, current->comm); |
| 1580 | printk(KERN_WARNING |
| 1581 | "process `%s' is using deprecated sysctl (%s) " |
| 1582 | "net.ipv6.neigh.%s.%s; " |
| 1583 | "Use net.ipv6.neigh.%s.%s_ms " |
| 1584 | "instead.\n", |
| 1585 | warncomm, func, |
| 1586 | dev_name, ctl->procname, |
| 1587 | dev_name, ctl->procname); |
| 1588 | warned++; |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) |
| 1593 | { |
| 1594 | struct net_device *dev = ctl->extra1; |
| 1595 | struct inet6_dev *idev; |
| 1596 | int ret; |
| 1597 | |
| 1598 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || |
| 1599 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) |
| 1600 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
| 1601 | |
| 1602 | switch (ctl->ctl_name) { |
| 1603 | case NET_NEIGH_RETRANS_TIME: |
| 1604 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
| 1605 | break; |
| 1606 | case NET_NEIGH_REACHABLE_TIME: |
| 1607 | ret = proc_dointvec_jiffies(ctl, write, |
| 1608 | filp, buffer, lenp, ppos); |
| 1609 | break; |
| 1610 | case NET_NEIGH_RETRANS_TIME_MS: |
| 1611 | case NET_NEIGH_REACHABLE_TIME_MS: |
| 1612 | ret = proc_dointvec_ms_jiffies(ctl, write, |
| 1613 | filp, buffer, lenp, ppos); |
| 1614 | break; |
| 1615 | default: |
| 1616 | ret = -1; |
| 1617 | } |
| 1618 | |
| 1619 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { |
| 1620 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || |
| 1621 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) |
| 1622 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
| 1623 | idev->tstamp = jiffies; |
| 1624 | inet6_ifinfo_notify(RTM_NEWLINK, idev); |
| 1625 | in6_dev_put(idev); |
| 1626 | } |
| 1627 | return ret; |
| 1628 | } |
| 1629 | |
| 1630 | static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name, |
| 1631 | int nlen, void __user *oldval, |
| 1632 | size_t __user *oldlenp, |
| 1633 | void __user *newval, size_t newlen, |
| 1634 | void **context) |
| 1635 | { |
| 1636 | struct net_device *dev = ctl->extra1; |
| 1637 | struct inet6_dev *idev; |
| 1638 | int ret; |
| 1639 | |
| 1640 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || |
| 1641 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) |
| 1642 | ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default"); |
| 1643 | |
| 1644 | switch (ctl->ctl_name) { |
| 1645 | case NET_NEIGH_REACHABLE_TIME: |
| 1646 | ret = sysctl_jiffies(ctl, name, nlen, |
| 1647 | oldval, oldlenp, newval, newlen, |
| 1648 | context); |
| 1649 | break; |
| 1650 | case NET_NEIGH_RETRANS_TIME_MS: |
| 1651 | case NET_NEIGH_REACHABLE_TIME_MS: |
| 1652 | ret = sysctl_ms_jiffies(ctl, name, nlen, |
| 1653 | oldval, oldlenp, newval, newlen, |
| 1654 | context); |
| 1655 | break; |
| 1656 | default: |
| 1657 | ret = 0; |
| 1658 | } |
| 1659 | |
| 1660 | if (newval && newlen && ret > 0 && |
| 1661 | dev && (idev = in6_dev_get(dev)) != NULL) { |
| 1662 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || |
| 1663 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) |
| 1664 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
| 1665 | idev->tstamp = jiffies; |
| 1666 | inet6_ifinfo_notify(RTM_NEWLINK, idev); |
| 1667 | in6_dev_put(idev); |
| 1668 | } |
| 1669 | |
| 1670 | return ret; |
| 1671 | } |
| 1672 | |
| 1673 | #endif |
| 1674 | |
| 1675 | int __init ndisc_init(struct net_proto_family *ops) |
| 1676 | { |
| 1677 | struct ipv6_pinfo *np; |
| 1678 | struct sock *sk; |
| 1679 | int err; |
| 1680 | |
| 1681 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket); |
| 1682 | if (err < 0) { |
| 1683 | ND_PRINTK0(KERN_ERR |
| 1684 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
| 1685 | err); |
| 1686 | ndisc_socket = NULL; /* For safety. */ |
| 1687 | return err; |
| 1688 | } |
| 1689 | |
| 1690 | sk = ndisc_socket->sk; |
| 1691 | np = inet6_sk(sk); |
| 1692 | sk->sk_allocation = GFP_ATOMIC; |
| 1693 | np->hop_limit = 255; |
| 1694 | /* Do not loopback ndisc messages */ |
| 1695 | np->mc_loop = 0; |
| 1696 | sk->sk_prot->unhash(sk); |
| 1697 | |
| 1698 | /* |
| 1699 | * Initialize the neighbour table |
| 1700 | */ |
| 1701 | |
| 1702 | neigh_table_init(&nd_tbl); |
| 1703 | |
| 1704 | #ifdef CONFIG_SYSCTL |
| 1705 | neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, |
| 1706 | "ipv6", |
| 1707 | &ndisc_ifinfo_sysctl_change, |
| 1708 | &ndisc_ifinfo_sysctl_strategy); |
| 1709 | #endif |
| 1710 | |
| 1711 | register_netdevice_notifier(&ndisc_netdev_notifier); |
| 1712 | return 0; |
| 1713 | } |
| 1714 | |
| 1715 | void ndisc_cleanup(void) |
| 1716 | { |
| 1717 | #ifdef CONFIG_SYSCTL |
| 1718 | neigh_sysctl_unregister(&nd_tbl.parms); |
| 1719 | #endif |
| 1720 | neigh_table_clear(&nd_tbl); |
| 1721 | sock_release(ndisc_socket); |
| 1722 | ndisc_socket = NULL; /* For safety. */ |
| 1723 | } |