Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Neighbour Discovery for IPv6 |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Alexey I. Froloff | e35f30c | 2012-04-06 05:50:58 +0000 | [diff] [blame] | 18 | * Alexey I. Froloff : RFC6106 (DNSSL) support |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 19 | * Pierre Ynard : export userland ND options |
| 20 | * through netlink (RDNSS support) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * Lars Fenneberg : fixed MTU setting on receipt |
| 22 | * of an RA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | * Janos Farkas : kmalloc failure checks |
| 24 | * Alexey Kuznetsov : state machine reworked |
| 25 | * and moved to net/core. |
| 26 | * Pekka Savola : RFC2461 validation |
| 27 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly |
| 28 | */ |
| 29 | |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 30 | #define pr_fmt(fmt) "ICMPv6: " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/errno.h> |
| 34 | #include <linux/types.h> |
| 35 | #include <linux/socket.h> |
| 36 | #include <linux/sockios.h> |
| 37 | #include <linux/sched.h> |
| 38 | #include <linux/net.h> |
| 39 | #include <linux/in6.h> |
| 40 | #include <linux/route.h> |
| 41 | #include <linux/init.h> |
| 42 | #include <linux/rcupdate.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 43 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_SYSCTL |
| 45 | #include <linux/sysctl.h> |
| 46 | #endif |
| 47 | |
Thomas Graf | 1823730 | 2006-08-04 23:04:54 -0700 | [diff] [blame] | 48 | #include <linux/if_addr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/if_arp.h> |
| 50 | #include <linux/ipv6.h> |
| 51 | #include <linux/icmpv6.h> |
| 52 | #include <linux/jhash.h> |
| 53 | |
| 54 | #include <net/sock.h> |
| 55 | #include <net/snmp.h> |
| 56 | |
| 57 | #include <net/ipv6.h> |
| 58 | #include <net/protocol.h> |
| 59 | #include <net/ndisc.h> |
| 60 | #include <net/ip6_route.h> |
| 61 | #include <net/addrconf.h> |
| 62 | #include <net/icmp.h> |
| 63 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 64 | #include <net/netlink.h> |
| 65 | #include <linux/rtnetlink.h> |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <net/flow.h> |
| 68 | #include <net/ip6_checksum.h> |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 69 | #include <net/inet_common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #include <linux/proc_fs.h> |
| 71 | |
| 72 | #include <linux/netfilter.h> |
| 73 | #include <linux/netfilter_ipv6.h> |
| 74 | |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 75 | /* Set to 3 to get tracing... */ |
| 76 | #define ND_DEBUG 1 |
| 77 | |
| 78 | #define ND_PRINTK(val, level, fmt, ...) \ |
| 79 | do { \ |
| 80 | if (val <= ND_DEBUG) \ |
| 81 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ |
| 82 | } while (0) |
| 83 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 84 | static u32 ndisc_hash(const void *pkey, |
| 85 | const struct net_device *dev, |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 86 | __u32 *hash_rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | static int ndisc_constructor(struct neighbour *neigh); |
| 88 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); |
| 89 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); |
| 90 | static int pndisc_constructor(struct pneigh_entry *n); |
| 91 | static void pndisc_destructor(struct pneigh_entry *n); |
| 92 | static void pndisc_redo(struct sk_buff *skb); |
| 93 | |
Stephen Hemminger | 89d69d2 | 2009-09-01 11:13:19 +0000 | [diff] [blame] | 94 | static const struct neigh_ops ndisc_generic_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | .family = AF_INET6, |
| 96 | .solicit = ndisc_solicit, |
| 97 | .error_report = ndisc_error_report, |
| 98 | .output = neigh_resolve_output, |
| 99 | .connected_output = neigh_connected_output, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | }; |
| 101 | |
Stephen Hemminger | 89d69d2 | 2009-09-01 11:13:19 +0000 | [diff] [blame] | 102 | static const struct neigh_ops ndisc_hh_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | .family = AF_INET6, |
| 104 | .solicit = ndisc_solicit, |
| 105 | .error_report = ndisc_error_report, |
| 106 | .output = neigh_resolve_output, |
| 107 | .connected_output = neigh_resolve_output, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | }; |
| 109 | |
| 110 | |
Stephen Hemminger | 89d69d2 | 2009-09-01 11:13:19 +0000 | [diff] [blame] | 111 | static const struct neigh_ops ndisc_direct_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | .family = AF_INET6, |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 113 | .output = neigh_direct_output, |
| 114 | .connected_output = neigh_direct_output, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | }; |
| 116 | |
| 117 | struct neigh_table nd_tbl = { |
| 118 | .family = AF_INET6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | .key_len = sizeof(struct in6_addr), |
| 120 | .hash = ndisc_hash, |
| 121 | .constructor = ndisc_constructor, |
| 122 | .pconstructor = pndisc_constructor, |
| 123 | .pdestructor = pndisc_destructor, |
| 124 | .proxy_redo = pndisc_redo, |
| 125 | .id = "ndisc_cache", |
| 126 | .parms = { |
Shan Wei | b672083 | 2010-12-01 18:05:12 +0000 | [diff] [blame] | 127 | .tbl = &nd_tbl, |
| 128 | .base_reachable_time = ND_REACHABLE_TIME, |
| 129 | .retrans_time = ND_RETRANS_TIMER, |
| 130 | .gc_staletime = 60 * HZ, |
| 131 | .reachable_time = ND_REACHABLE_TIME, |
| 132 | .delay_probe_time = 5 * HZ, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 133 | .queue_len_bytes = 64*1024, |
Shan Wei | b672083 | 2010-12-01 18:05:12 +0000 | [diff] [blame] | 134 | .ucast_probes = 3, |
| 135 | .mcast_probes = 3, |
| 136 | .anycast_delay = 1 * HZ, |
| 137 | .proxy_delay = (8 * HZ) / 10, |
| 138 | .proxy_qlen = 64, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | }, |
| 140 | .gc_interval = 30 * HZ, |
| 141 | .gc_thresh1 = 128, |
| 142 | .gc_thresh2 = 512, |
| 143 | .gc_thresh3 = 1024, |
| 144 | }; |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | static inline int ndisc_opt_addr_space(struct net_device *dev) |
| 147 | { |
| 148 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); |
| 149 | } |
| 150 | |
| 151 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, |
| 152 | unsigned short addr_type) |
| 153 | { |
| 154 | int space = NDISC_OPT_SPACE(data_len); |
| 155 | int pad = ndisc_addr_option_pad(addr_type); |
| 156 | |
| 157 | opt[0] = type; |
| 158 | opt[1] = space>>3; |
| 159 | |
| 160 | memset(opt + 2, 0, pad); |
| 161 | opt += pad; |
| 162 | space -= pad; |
| 163 | |
| 164 | memcpy(opt+2, data, data_len); |
| 165 | data_len += 2; |
| 166 | opt += data_len; |
| 167 | if ((space -= data_len) > 0) |
| 168 | memset(opt, 0, space); |
| 169 | return opt + space; |
| 170 | } |
| 171 | |
| 172 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
| 173 | struct nd_opt_hdr *end) |
| 174 | { |
| 175 | int type; |
| 176 | if (!cur || !end || cur >= end) |
| 177 | return NULL; |
| 178 | type = cur->nd_opt_type; |
| 179 | do { |
| 180 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
| 181 | } while(cur < end && cur->nd_opt_type != type); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 182 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 185 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
| 186 | { |
Alexey I. Froloff | e35f30c | 2012-04-06 05:50:58 +0000 | [diff] [blame] | 187 | return opt->nd_opt_type == ND_OPT_RDNSS || |
| 188 | opt->nd_opt_type == ND_OPT_DNSSL; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, |
| 192 | struct nd_opt_hdr *end) |
| 193 | { |
| 194 | if (!cur || !end || cur >= end) |
| 195 | return NULL; |
| 196 | do { |
| 197 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
| 198 | } while(cur < end && !ndisc_is_useropt(cur)); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 199 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 200 | } |
| 201 | |
David S. Miller | 30f2a5f | 2012-07-11 23:26:46 -0700 | [diff] [blame] | 202 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
| 203 | struct ndisc_options *ndopts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
| 205 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; |
| 206 | |
| 207 | if (!nd_opt || opt_len < 0 || !ndopts) |
| 208 | return NULL; |
| 209 | memset(ndopts, 0, sizeof(*ndopts)); |
| 210 | while (opt_len) { |
| 211 | int l; |
| 212 | if (opt_len < sizeof(struct nd_opt_hdr)) |
| 213 | return NULL; |
| 214 | l = nd_opt->nd_opt_len << 3; |
| 215 | if (opt_len < l || l == 0) |
| 216 | return NULL; |
| 217 | switch (nd_opt->nd_opt_type) { |
| 218 | case ND_OPT_SOURCE_LL_ADDR: |
| 219 | case ND_OPT_TARGET_LL_ADDR: |
| 220 | case ND_OPT_MTU: |
| 221 | case ND_OPT_REDIRECT_HDR: |
| 222 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 223 | ND_PRINTK(2, warn, |
| 224 | "%s: duplicated ND6 option found: type=%d\n", |
| 225 | __func__, nd_opt->nd_opt_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } else { |
| 227 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 228 | } |
| 229 | break; |
| 230 | case ND_OPT_PREFIX_INFO: |
| 231 | ndopts->nd_opts_pi_end = nd_opt; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 232 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 234 | break; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 235 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 236 | case ND_OPT_ROUTE_INFO: |
| 237 | ndopts->nd_opts_ri_end = nd_opt; |
| 238 | if (!ndopts->nd_opts_ri) |
| 239 | ndopts->nd_opts_ri = nd_opt; |
| 240 | break; |
| 241 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | default: |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 243 | if (ndisc_is_useropt(nd_opt)) { |
| 244 | ndopts->nd_useropts_end = nd_opt; |
| 245 | if (!ndopts->nd_useropts) |
| 246 | ndopts->nd_useropts = nd_opt; |
| 247 | } else { |
| 248 | /* |
| 249 | * Unknown options must be silently ignored, |
| 250 | * to accommodate future extension to the |
| 251 | * protocol. |
| 252 | */ |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 253 | ND_PRINTK(2, notice, |
| 254 | "%s: ignored unsupported option; type=%d, len=%d\n", |
| 255 | __func__, |
| 256 | nd_opt->nd_opt_type, |
| 257 | nd_opt->nd_opt_len); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 258 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
| 260 | opt_len -= l; |
| 261 | nd_opt = ((void *)nd_opt) + l; |
| 262 | } |
| 263 | return ndopts; |
| 264 | } |
| 265 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 266 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | { |
| 268 | switch (dev->type) { |
| 269 | case ARPHRD_ETHER: |
| 270 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ |
| 271 | case ARPHRD_FDDI: |
| 272 | ipv6_eth_mc_map(addr, buf); |
| 273 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | case ARPHRD_ARCNET: |
| 275 | ipv6_arcnet_mc_map(addr, buf); |
| 276 | return 0; |
| 277 | case ARPHRD_INFINIBAND: |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 278 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | return 0; |
Timo Teräs | 93ca3bb | 2011-03-28 22:40:53 +0000 | [diff] [blame] | 280 | case ARPHRD_IPGRE: |
| 281 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | default: |
| 283 | if (dir) { |
| 284 | memcpy(buf, dev->broadcast, dev->addr_len); |
| 285 | return 0; |
| 286 | } |
| 287 | } |
| 288 | return -EINVAL; |
| 289 | } |
| 290 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 291 | EXPORT_SYMBOL(ndisc_mc_map); |
| 292 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 293 | static u32 ndisc_hash(const void *pkey, |
| 294 | const struct net_device *dev, |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 295 | __u32 *hash_rnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 297 | return ndisc_hashfn(pkey, dev, hash_rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | static int ndisc_constructor(struct neighbour *neigh) |
| 301 | { |
| 302 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; |
| 303 | struct net_device *dev = neigh->dev; |
| 304 | struct inet6_dev *in6_dev; |
| 305 | struct neigh_parms *parms; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 306 | bool is_multicast = ipv6_addr_is_multicast(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | in6_dev = in6_dev_get(dev); |
| 309 | if (in6_dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | return -EINVAL; |
| 311 | } |
| 312 | |
| 313 | parms = in6_dev->nd_parms; |
| 314 | __neigh_parms_put(neigh->parms); |
| 315 | neigh->parms = neigh_parms_clone(parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 318 | if (!dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | neigh->nud_state = NUD_NOARP; |
| 320 | neigh->ops = &ndisc_direct_ops; |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 321 | neigh->output = neigh_direct_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } else { |
| 323 | if (is_multicast) { |
| 324 | neigh->nud_state = NUD_NOARP; |
| 325 | ndisc_mc_map(addr, neigh->ha, dev, 1); |
| 326 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { |
| 327 | neigh->nud_state = NUD_NOARP; |
| 328 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); |
| 329 | if (dev->flags&IFF_LOOPBACK) |
| 330 | neigh->type = RTN_LOCAL; |
| 331 | } else if (dev->flags&IFF_POINTOPOINT) { |
| 332 | neigh->nud_state = NUD_NOARP; |
| 333 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); |
| 334 | } |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 335 | if (dev->header_ops->cache) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | neigh->ops = &ndisc_hh_ops; |
| 337 | else |
| 338 | neigh->ops = &ndisc_generic_ops; |
| 339 | if (neigh->nud_state&NUD_VALID) |
| 340 | neigh->output = neigh->ops->connected_output; |
| 341 | else |
| 342 | neigh->output = neigh->ops->output; |
| 343 | } |
| 344 | in6_dev_put(in6_dev); |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static int pndisc_constructor(struct pneigh_entry *n) |
| 349 | { |
| 350 | struct in6_addr *addr = (struct in6_addr*)&n->key; |
| 351 | struct in6_addr maddr; |
| 352 | struct net_device *dev = n->dev; |
| 353 | |
| 354 | if (dev == NULL || __in6_dev_get(dev) == NULL) |
| 355 | return -EINVAL; |
| 356 | addrconf_addr_solict_mult(addr, &maddr); |
| 357 | ipv6_dev_mc_inc(dev, &maddr); |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static void pndisc_destructor(struct pneigh_entry *n) |
| 362 | { |
| 363 | struct in6_addr *addr = (struct in6_addr*)&n->key; |
| 364 | struct in6_addr maddr; |
| 365 | struct net_device *dev = n->dev; |
| 366 | |
| 367 | if (dev == NULL || __in6_dev_get(dev) == NULL) |
| 368 | return; |
| 369 | addrconf_addr_solict_mult(addr, &maddr); |
| 370 | ipv6_dev_mc_dec(dev, &maddr); |
| 371 | } |
| 372 | |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 373 | struct sk_buff *ndisc_build_skb(struct net_device *dev, |
| 374 | const struct in6_addr *daddr, |
| 375 | const struct in6_addr *saddr, |
| 376 | struct icmp6hdr *icmp6h, |
| 377 | const struct in6_addr *target, |
| 378 | int llinfo) |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 379 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 380 | struct net *net = dev_net(dev); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 381 | struct sock *sk = net->ipv6.ndisc_sk; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 382 | struct sk_buff *skb; |
| 383 | struct icmp6hdr *hdr; |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 384 | int hlen = LL_RESERVED_SPACE(dev); |
| 385 | int tlen = dev->needed_tailroom; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 386 | int len; |
| 387 | int err; |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 388 | u8 *opt; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 389 | |
| 390 | if (!dev->addr_len) |
| 391 | llinfo = 0; |
| 392 | |
| 393 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); |
| 394 | if (llinfo) |
| 395 | len += ndisc_opt_addr_space(dev); |
| 396 | |
| 397 | skb = sock_alloc_send_skb(sk, |
| 398 | (MAX_HEADER + sizeof(struct ipv6hdr) + |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 399 | len + hlen + tlen), |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 400 | 1, &err); |
| 401 | if (!skb) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 402 | ND_PRINTK(0, err, "ND: %s failed to allocate an skb, err=%d\n", |
| 403 | __func__, err); |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 404 | return NULL; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 405 | } |
| 406 | |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 407 | skb_reserve(skb, hlen); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 408 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
| 409 | |
| 410 | skb->transport_header = skb->tail; |
| 411 | skb_put(skb, len); |
| 412 | |
| 413 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
| 414 | memcpy(hdr, icmp6h, sizeof(*hdr)); |
| 415 | |
| 416 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
| 417 | if (target) { |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 418 | *(struct in6_addr *)opt = *target; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 419 | opt += sizeof(*target); |
| 420 | } |
| 421 | |
| 422 | if (llinfo) |
| 423 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, |
| 424 | dev->addr_len, dev->type); |
| 425 | |
| 426 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
| 427 | IPPROTO_ICMPV6, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 428 | csum_partial(hdr, |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 429 | len, 0)); |
| 430 | |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 431 | return skb; |
| 432 | } |
| 433 | |
| 434 | EXPORT_SYMBOL(ndisc_build_skb); |
| 435 | |
| 436 | void ndisc_send_skb(struct sk_buff *skb, |
| 437 | struct net_device *dev, |
| 438 | struct neighbour *neigh, |
| 439 | const struct in6_addr *daddr, |
| 440 | const struct in6_addr *saddr, |
| 441 | struct icmp6hdr *icmp6h) |
| 442 | { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 443 | struct flowi6 fl6; |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 444 | struct dst_entry *dst; |
| 445 | struct net *net = dev_net(dev); |
| 446 | struct sock *sk = net->ipv6.ndisc_sk; |
| 447 | struct inet6_dev *idev; |
| 448 | int err; |
| 449 | u8 type; |
| 450 | |
| 451 | type = icmp6h->icmp6_type; |
| 452 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 453 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
David S. Miller | 87a1157 | 2011-12-06 17:04:13 -0500 | [diff] [blame] | 454 | dst = icmp6_dst_alloc(dev, neigh, &fl6); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 455 | if (IS_ERR(dst)) { |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 456 | kfree_skb(skb); |
| 457 | return; |
| 458 | } |
| 459 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 460 | skb_dst_set(skb, dst); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 461 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 462 | rcu_read_lock(); |
| 463 | idev = __in6_dev_get(dst->dev); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 464 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 465 | |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 466 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 467 | dst_output); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 468 | if (!err) { |
Denis V. Lunev | 5c5d244 | 2008-10-08 10:33:50 -0700 | [diff] [blame] | 469 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
Denis V. Lunev | a862f6a | 2008-10-08 10:33:06 -0700 | [diff] [blame] | 470 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 471 | } |
| 472 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 473 | rcu_read_unlock(); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 474 | } |
| 475 | |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 476 | EXPORT_SYMBOL(ndisc_send_skb); |
| 477 | |
| 478 | /* |
| 479 | * Send a Neighbour Discover packet |
| 480 | */ |
| 481 | static void __ndisc_send(struct net_device *dev, |
| 482 | struct neighbour *neigh, |
| 483 | const struct in6_addr *daddr, |
| 484 | const struct in6_addr *saddr, |
| 485 | struct icmp6hdr *icmp6h, const struct in6_addr *target, |
| 486 | int llinfo) |
| 487 | { |
| 488 | struct sk_buff *skb; |
| 489 | |
| 490 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); |
| 491 | if (!skb) |
| 492 | return; |
| 493 | |
| 494 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); |
| 495 | } |
| 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 498 | const struct in6_addr *daddr, |
| 499 | const struct in6_addr *solicited_addr, |
| 500 | int router, int solicited, int override, int inc_opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | { |
| 502 | struct in6_addr tmpaddr; |
| 503 | struct inet6_ifaddr *ifp; |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 504 | const struct in6_addr *src_addr; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 505 | struct icmp6hdr icmp6h = { |
| 506 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, |
| 507 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | /* for anycast or proxy, solicited_addr != src_addr */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 510 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 511 | if (ifp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | src_addr = solicited_addr; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 513 | if (ifp->flags & IFA_F_OPTIMISTIC) |
| 514 | override = 0; |
stephen hemminger | 9f88816 | 2010-06-21 11:00:13 +0000 | [diff] [blame] | 515 | inc_opt |= ifp->idev->cnf.force_tllao; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | in6_ifa_put(ifp); |
| 517 | } else { |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 518 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 519 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 520 | &tmpaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | return; |
| 522 | src_addr = &tmpaddr; |
| 523 | } |
| 524 | |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 525 | icmp6h.icmp6_router = router; |
| 526 | icmp6h.icmp6_solicited = solicited; |
| 527 | icmp6h.icmp6_override = override; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 529 | __ndisc_send(dev, neigh, daddr, src_addr, |
| 530 | &icmp6h, solicited_addr, |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 531 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 532 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 534 | static void ndisc_send_unsol_na(struct net_device *dev) |
| 535 | { |
| 536 | struct inet6_dev *idev; |
| 537 | struct inet6_ifaddr *ifa; |
Hannes Frederic Sowa | 60713a0 | 2012-11-06 16:18:41 +0000 | [diff] [blame] | 538 | struct in6_addr mcaddr = IN6ADDR_LINKLOCAL_ALLNODES_INIT; |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 539 | |
| 540 | idev = in6_dev_get(dev); |
| 541 | if (!idev) |
| 542 | return; |
| 543 | |
| 544 | read_lock_bh(&idev->lock); |
| 545 | list_for_each_entry(ifa, &idev->addr_list, if_list) { |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 546 | ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr, |
| 547 | /*router=*/ !!idev->cnf.forwarding, |
| 548 | /*solicited=*/ false, /*override=*/ true, |
| 549 | /*inc_opt=*/ true); |
| 550 | } |
| 551 | read_unlock_bh(&idev->lock); |
| 552 | |
| 553 | in6_dev_put(idev); |
| 554 | } |
| 555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 557 | const struct in6_addr *solicit, |
| 558 | const struct in6_addr *daddr, const struct in6_addr *saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | struct in6_addr addr_buf; |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 561 | struct icmp6hdr icmp6h = { |
| 562 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, |
| 563 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | if (saddr == NULL) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 566 | if (ipv6_get_lladdr(dev, &addr_buf, |
| 567 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | return; |
| 569 | saddr = &addr_buf; |
| 570 | } |
| 571 | |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 572 | __ndisc_send(dev, neigh, daddr, saddr, |
| 573 | &icmp6h, solicit, |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 574 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 577 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
| 578 | const struct in6_addr *daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | { |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 580 | struct icmp6hdr icmp6h = { |
| 581 | .icmp6_type = NDISC_ROUTER_SOLICITATION, |
| 582 | }; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 583 | int send_sllao = dev->addr_len; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 584 | |
| 585 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 586 | /* |
| 587 | * According to section 2.2 of RFC 4429, we must not |
| 588 | * send router solicitations with a sllao from |
| 589 | * optimistic addresses, but we may send the solicitation |
| 590 | * if we don't include the sllao. So here we check |
| 591 | * if our address is optimistic, and if so, we |
Joe Perches | bea8519 | 2007-12-20 14:01:35 -0800 | [diff] [blame] | 592 | * suppress the inclusion of the sllao. |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 593 | */ |
| 594 | if (send_sllao) { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 595 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
Daniel Lezcano | 1cab3da | 2008-01-10 22:44:09 -0800 | [diff] [blame] | 596 | dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 597 | if (ifp) { |
| 598 | if (ifp->flags & IFA_F_OPTIMISTIC) { |
YOSHIFUJI Hideaki | ca04356 | 2007-02-28 23:13:20 +0900 | [diff] [blame] | 599 | send_sllao = 0; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 600 | } |
YOSHIFUJI Hideaki | ca04356 | 2007-02-28 23:13:20 +0900 | [diff] [blame] | 601 | in6_ifa_put(ifp); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 602 | } else { |
| 603 | send_sllao = 0; |
| 604 | } |
| 605 | } |
| 606 | #endif |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 607 | __ndisc_send(dev, NULL, daddr, saddr, |
| 608 | &icmp6h, NULL, |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 609 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
| 613 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) |
| 614 | { |
| 615 | /* |
| 616 | * "The sender MUST return an ICMP |
| 617 | * destination unreachable" |
| 618 | */ |
| 619 | dst_link_failure(skb); |
| 620 | kfree_skb(skb); |
| 621 | } |
| 622 | |
| 623 | /* Called with locked neigh: either read or both */ |
| 624 | |
| 625 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) |
| 626 | { |
| 627 | struct in6_addr *saddr = NULL; |
| 628 | struct in6_addr mcaddr; |
| 629 | struct net_device *dev = neigh->dev; |
| 630 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; |
| 631 | int probes = atomic_read(&neigh->probes); |
| 632 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 633 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 634 | saddr = &ipv6_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
| 636 | if ((probes -= neigh->parms->ucast_probes) < 0) { |
| 637 | if (!(neigh->nud_state & NUD_VALID)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 638 | ND_PRINTK(1, dbg, |
| 639 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", |
| 640 | __func__, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } |
| 642 | ndisc_send_ns(dev, neigh, target, target, saddr); |
| 643 | } else if ((probes -= neigh->parms->app_probes) < 0) { |
| 644 | #ifdef CONFIG_ARPD |
| 645 | neigh_app_ns(neigh); |
| 646 | #endif |
| 647 | } else { |
| 648 | addrconf_addr_solict_mult(target, &mcaddr); |
| 649 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); |
| 650 | } |
| 651 | } |
| 652 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 653 | static int pndisc_is_router(const void *pkey, |
| 654 | struct net_device *dev) |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 655 | { |
| 656 | struct pneigh_entry *n; |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 657 | int ret = -1; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 658 | |
| 659 | read_lock_bh(&nd_tbl.lock); |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 660 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
| 661 | if (n) |
| 662 | ret = !!(n->flags & NTF_ROUTER); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 663 | read_unlock_bh(&nd_tbl.lock); |
| 664 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 665 | return ret; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 666 | } |
| 667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | static void ndisc_recv_ns(struct sk_buff *skb) |
| 669 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 670 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 671 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
| 672 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | u8 *lladdr = NULL; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 674 | u32 ndoptlen = skb->tail - (skb->transport_header + |
| 675 | offsetof(struct nd_msg, opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | struct ndisc_options ndopts; |
| 677 | struct net_device *dev = skb->dev; |
| 678 | struct inet6_ifaddr *ifp; |
| 679 | struct inet6_dev *idev = NULL; |
| 680 | struct neighbour *neigh; |
| 681 | int dad = ipv6_addr_any(saddr); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 682 | bool inc; |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 683 | int is_router = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | if (ipv6_addr_is_multicast(&msg->target)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 686 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | return; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * RFC2461 7.1.1: |
| 692 | * DAD has to be destined for solicited node multicast address. |
| 693 | */ |
| 694 | if (dad && |
| 695 | !(daddr->s6_addr32[0] == htonl(0xff020000) && |
| 696 | daddr->s6_addr32[1] == htonl(0x00000000) && |
| 697 | daddr->s6_addr32[2] == htonl(0x00000001) && |
| 698 | daddr->s6_addr [12] == 0xff )) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 699 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | return; |
| 701 | } |
| 702 | |
| 703 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 704 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | return; |
| 706 | } |
| 707 | |
| 708 | if (ndopts.nd_opts_src_lladdr) { |
| 709 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); |
| 710 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 711 | ND_PRINTK(2, warn, |
| 712 | "NS: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | return; |
| 714 | } |
| 715 | |
| 716 | /* RFC2461 7.1.1: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 717 | * If the IP source address is the unspecified address, |
| 718 | * there MUST NOT be source link-layer address option |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | * in the message. |
| 720 | */ |
| 721 | if (dad) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 722 | ND_PRINTK(2, warn, |
| 723 | "NS: bad DAD packet (link-layer address option)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return; |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | inc = ipv6_addr_is_multicast(daddr); |
| 729 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 730 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 731 | if (ifp) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 732 | |
| 733 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
| 734 | if (dad) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 735 | /* |
| 736 | * We are colliding with another node |
| 737 | * who is doing DAD |
| 738 | * so fail our DAD process |
| 739 | */ |
| 740 | addrconf_dad_failure(ifp); |
Denis V. Lunev | 9e3be4b | 2007-09-11 11:04:49 +0200 | [diff] [blame] | 741 | return; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 742 | } else { |
| 743 | /* |
| 744 | * This is not a dad solicitation. |
| 745 | * If we are an optimistic node, |
| 746 | * we should respond. |
| 747 | * Otherwise, we should ignore it. |
| 748 | */ |
| 749 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) |
| 750 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | idev = ifp->idev; |
| 755 | } else { |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 756 | struct net *net = dev_net(dev); |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | idev = in6_dev_get(dev); |
| 759 | if (!idev) { |
| 760 | /* XXX: count this drop? */ |
| 761 | return; |
| 762 | } |
| 763 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 764 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 765 | (idev->cnf.forwarding && |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 766 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 767 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 768 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | skb->pkt_type != PACKET_HOST && |
| 770 | inc != 0 && |
| 771 | idev->nd_parms->proxy_delay != 0) { |
| 772 | /* |
| 773 | * for anycast or proxy, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 774 | * sender should delay its response |
| 775 | * by a random time between 0 and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | * MAX_ANYCAST_DELAY_TIME seconds. |
| 777 | * (RFC2461) -- yoshfuji |
| 778 | */ |
| 779 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); |
| 780 | if (n) |
| 781 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); |
| 782 | goto out; |
| 783 | } |
| 784 | } else |
| 785 | goto out; |
| 786 | } |
| 787 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 788 | if (is_router < 0) |
| 789 | is_router = !!idev->cnf.forwarding; |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | if (dad) { |
YOSHIFUJI Hideaki | f3ee401 | 2008-04-10 15:42:11 +0900 | [diff] [blame] | 792 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 793 | is_router, 0, (ifp != NULL), 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | goto out; |
| 795 | } |
| 796 | |
| 797 | if (inc) |
| 798 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); |
| 799 | else |
| 800 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); |
| 801 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 802 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | * update / create cache entry |
| 804 | * for the source address |
| 805 | */ |
| 806 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, |
| 807 | !inc || lladdr || !dev->addr_len); |
| 808 | if (neigh) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 809 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 811 | NEIGH_UPDATE_F_OVERRIDE); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 812 | if (neigh || !dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 814 | is_router, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | 1, (ifp != NULL && inc), inc); |
| 816 | if (neigh) |
| 817 | neigh_release(neigh); |
| 818 | } |
| 819 | |
| 820 | out: |
| 821 | if (ifp) |
| 822 | in6_ifa_put(ifp); |
| 823 | else |
| 824 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | |
| 827 | static void ndisc_recv_na(struct sk_buff *skb) |
| 828 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 829 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 830 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
| 831 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | u8 *lladdr = NULL; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 833 | u32 ndoptlen = skb->tail - (skb->transport_header + |
| 834 | offsetof(struct nd_msg, opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | struct ndisc_options ndopts; |
| 836 | struct net_device *dev = skb->dev; |
| 837 | struct inet6_ifaddr *ifp; |
| 838 | struct neighbour *neigh; |
| 839 | |
| 840 | if (skb->len < sizeof(struct nd_msg)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 841 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | return; |
| 843 | } |
| 844 | |
| 845 | if (ipv6_addr_is_multicast(&msg->target)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 846 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | return; |
| 848 | } |
| 849 | |
| 850 | if (ipv6_addr_is_multicast(daddr) && |
| 851 | msg->icmph.icmp6_solicited) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 852 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | return; |
| 854 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 857 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | return; |
| 859 | } |
| 860 | if (ndopts.nd_opts_tgt_lladdr) { |
| 861 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); |
| 862 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 863 | ND_PRINTK(2, warn, |
| 864 | "NA: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | return; |
| 866 | } |
| 867 | } |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 868 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 869 | if (ifp) { |
Daniel Walter | bd01592 | 2011-04-13 21:09:25 +0000 | [diff] [blame] | 870 | if (skb->pkt_type != PACKET_LOOPBACK |
| 871 | && (ifp->flags & IFA_F_TENTATIVE)) { |
| 872 | addrconf_dad_failure(ifp); |
| 873 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
| 875 | /* What should we make now? The advertisement |
| 876 | is invalid, but ndisc specs say nothing |
| 877 | about it. It could be misconfiguration, or |
| 878 | an smart proxy agent tries to help us :-) |
Jan Sembera | 24fc7b8 | 2008-12-09 15:48:32 -0800 | [diff] [blame] | 879 | |
| 880 | We should not print the error if NA has been |
| 881 | received from loopback - it is just our own |
| 882 | unsolicited advertisement. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | */ |
Jan Sembera | 24fc7b8 | 2008-12-09 15:48:32 -0800 | [diff] [blame] | 884 | if (skb->pkt_type != PACKET_LOOPBACK) |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 885 | ND_PRINTK(1, warn, |
| 886 | "NA: someone advertises our address %pI6 on %s!\n", |
| 887 | &ifp->addr, ifp->idev->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | in6_ifa_put(ifp); |
| 889 | return; |
| 890 | } |
| 891 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); |
| 892 | |
| 893 | if (neigh) { |
| 894 | u8 old_flags = neigh->flags; |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 895 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
| 897 | if (neigh->nud_state & NUD_FAILED) |
| 898 | goto out; |
| 899 | |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 900 | /* |
| 901 | * Don't update the neighbor cache entry on a proxy NA from |
| 902 | * ourselves because either the proxied node is off link or it |
| 903 | * has already sent a NA to us. |
| 904 | */ |
| 905 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 906 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
| 907 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 908 | /* XXX: idev->cnf.prixy_ndp */ |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 909 | goto out; |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 910 | } |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 911 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | neigh_update(neigh, lladdr, |
| 913 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
| 914 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 915 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| |
| 916 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 917 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); |
| 918 | |
| 919 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { |
| 920 | /* |
| 921 | * Change: router to host |
| 922 | */ |
| 923 | struct rt6_info *rt; |
| 924 | rt = rt6_get_dflt_router(saddr, dev); |
| 925 | if (rt) |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 926 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | |
| 929 | out: |
| 930 | neigh_release(neigh); |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | static void ndisc_recv_rs(struct sk_buff *skb) |
| 935 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 936 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
| 938 | struct neighbour *neigh; |
| 939 | struct inet6_dev *idev; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 940 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | struct ndisc_options ndopts; |
| 942 | u8 *lladdr = NULL; |
| 943 | |
| 944 | if (skb->len < sizeof(*rs_msg)) |
| 945 | return; |
| 946 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 947 | idev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | if (!idev) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 949 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | return; |
| 951 | } |
| 952 | |
| 953 | /* Don't accept RS if we're not in router mode */ |
| 954 | if (!idev->cnf.forwarding) |
| 955 | goto out; |
| 956 | |
| 957 | /* |
| 958 | * Don't update NCE if src = ::; |
| 959 | * this implies that the source node has no ip address assigned yet. |
| 960 | */ |
| 961 | if (ipv6_addr_any(saddr)) |
| 962 | goto out; |
| 963 | |
| 964 | /* Parse ND options */ |
| 965 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 966 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | goto out; |
| 968 | } |
| 969 | |
| 970 | if (ndopts.nd_opts_src_lladdr) { |
| 971 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 972 | skb->dev); |
| 973 | if (!lladdr) |
| 974 | goto out; |
| 975 | } |
| 976 | |
| 977 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); |
| 978 | if (neigh) { |
| 979 | neigh_update(neigh, lladdr, NUD_STALE, |
| 980 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 981 | NEIGH_UPDATE_F_OVERRIDE| |
| 982 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); |
| 983 | neigh_release(neigh); |
| 984 | } |
| 985 | out: |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 986 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
| 988 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 989 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
| 990 | { |
| 991 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); |
| 992 | struct sk_buff *skb; |
| 993 | struct nlmsghdr *nlh; |
| 994 | struct nduseroptmsg *ndmsg; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 995 | struct net *net = dev_net(ra->dev); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 996 | int err; |
| 997 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) |
| 998 | + (opt->nd_opt_len << 3)); |
| 999 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); |
| 1000 | |
| 1001 | skb = nlmsg_new(msg_size, GFP_ATOMIC); |
| 1002 | if (skb == NULL) { |
| 1003 | err = -ENOBUFS; |
| 1004 | goto errout; |
| 1005 | } |
| 1006 | |
| 1007 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); |
| 1008 | if (nlh == NULL) { |
| 1009 | goto nla_put_failure; |
| 1010 | } |
| 1011 | |
| 1012 | ndmsg = nlmsg_data(nlh); |
| 1013 | ndmsg->nduseropt_family = AF_INET6; |
Pierre Ynard | dbb2ed2 | 2007-11-12 17:58:35 -0800 | [diff] [blame] | 1014 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1015 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
| 1016 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; |
| 1017 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; |
| 1018 | |
| 1019 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); |
| 1020 | |
David S. Miller | c78679e | 2012-04-01 20:27:33 -0400 | [diff] [blame] | 1021 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
| 1022 | &ipv6_hdr(ra)->saddr)) |
| 1023 | goto nla_put_failure; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1024 | nlmsg_end(skb, nlh); |
| 1025 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1026 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1027 | return; |
| 1028 | |
| 1029 | nla_put_failure: |
| 1030 | nlmsg_free(skb); |
| 1031 | err = -EMSGSIZE; |
| 1032 | errout: |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 1033 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1034 | } |
| 1035 | |
Thomas Graf | 65e9b62 | 2010-09-03 02:59:14 +0000 | [diff] [blame] | 1036 | static inline int accept_ra(struct inet6_dev *in6_dev) |
| 1037 | { |
| 1038 | /* |
| 1039 | * If forwarding is enabled, RA are not accepted unless the special |
| 1040 | * hybrid mode (accept_ra=2) is enabled. |
| 1041 | */ |
| 1042 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) |
| 1043 | return 0; |
| 1044 | |
| 1045 | return in6_dev->cnf.accept_ra; |
| 1046 | } |
| 1047 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | static void ndisc_router_discovery(struct sk_buff *skb) |
| 1049 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1050 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | struct neighbour *neigh = NULL; |
| 1052 | struct inet6_dev *in6_dev; |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1053 | struct rt6_info *rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | int lifetime; |
| 1055 | struct ndisc_options ndopts; |
| 1056 | int optlen; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1057 | unsigned int pref = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
| 1059 | __u8 * opt = (__u8 *)(ra_msg + 1); |
| 1060 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1061 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1063 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1064 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | return; |
| 1066 | } |
| 1067 | if (optlen < 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1068 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | return; |
| 1070 | } |
| 1071 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1072 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1073 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1074 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1075 | return; |
| 1076 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1077 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | /* |
| 1080 | * set the RA_RECV flag in the interface |
| 1081 | */ |
| 1082 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1083 | in6_dev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | if (in6_dev == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1085 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
| 1086 | skb->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | return; |
| 1088 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
| 1090 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1091 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | return; |
| 1093 | } |
| 1094 | |
Thomas Graf | 65e9b62 | 2010-09-03 02:59:14 +0000 | [diff] [blame] | 1095 | if (!accept_ra(in6_dev)) |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1096 | goto skip_linkparms; |
| 1097 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1098 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1099 | /* skip link-specific parameters from interior routers */ |
| 1100 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) |
| 1101 | goto skip_linkparms; |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1102 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | if (in6_dev->if_flags & IF_RS_SENT) { |
| 1105 | /* |
| 1106 | * flag that an RA was received after an RS was sent |
| 1107 | * out on this interface. |
| 1108 | */ |
| 1109 | in6_dev->if_flags |= IF_RA_RCVD; |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * Remember the managed/otherconf flags from most recently |
| 1114 | * received RA message (RFC 2462) -- yoshfuji |
| 1115 | */ |
| 1116 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
| 1117 | IF_RA_OTHERCONF)) | |
| 1118 | (ra_msg->icmph.icmp6_addrconf_managed ? |
| 1119 | IF_RA_MANAGED : 0) | |
| 1120 | (ra_msg->icmph.icmp6_addrconf_other ? |
| 1121 | IF_RA_OTHERCONF : 0); |
| 1122 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1123 | if (!in6_dev->cnf.accept_ra_defrtr) |
| 1124 | goto skip_defrtr; |
| 1125 | |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1126 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
| 1127 | goto skip_defrtr; |
| 1128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
| 1130 | |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1131 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 1132 | pref = ra_msg->icmph.icmp6_router_pref; |
| 1133 | /* 10b is handled as if it were 00b (medium) */ |
YOSHIFUJI Hideaki | 930d6ff | 2006-03-20 17:05:30 -0800 | [diff] [blame] | 1134 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
YOSHIFUJI Hideaki | 6d5b78c | 2007-06-22 16:07:04 -0700 | [diff] [blame] | 1135 | !in6_dev->cnf.accept_ra_rtr_pref) |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1136 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
| 1137 | #endif |
| 1138 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1139 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1141 | if (rt) { |
| 1142 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
| 1143 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1144 | ND_PRINTK(0, err, |
| 1145 | "RA: %s got default router without neighbour\n", |
| 1146 | __func__); |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1147 | dst_release(&rt->dst); |
| 1148 | return; |
| 1149 | } |
| 1150 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | if (rt && lifetime == 0) { |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1152 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | rt = NULL; |
| 1154 | } |
| 1155 | |
| 1156 | if (rt == NULL && lifetime) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1157 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1159 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | if (rt == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1161 | ND_PRINTK(0, err, |
| 1162 | "RA: %s failed to add default route\n", |
| 1163 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | return; |
| 1165 | } |
| 1166 | |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1167 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | if (neigh == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1169 | ND_PRINTK(0, err, |
| 1170 | "RA: %s got default router without neighbour\n", |
| 1171 | __func__); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1172 | dst_release(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | return; |
| 1174 | } |
| 1175 | neigh->flags |= NTF_ROUTER; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1176 | } else if (rt) { |
Pedro Ribeiro | 22441cf | 2008-10-15 15:47:49 -0700 | [diff] [blame] | 1177 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
| 1180 | if (rt) |
Gao feng | 1716a96 | 2012-04-06 00:13:10 +0000 | [diff] [blame] | 1181 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | if (ra_msg->icmph.icmp6_hop_limit) { |
| 1183 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
| 1184 | if (rt) |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1185 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
| 1186 | ra_msg->icmph.icmp6_hop_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1189 | skip_defrtr: |
| 1190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | /* |
| 1192 | * Update Reachable Time and Retrans Timer |
| 1193 | */ |
| 1194 | |
| 1195 | if (in6_dev->nd_parms) { |
| 1196 | unsigned long rtime = ntohl(ra_msg->retrans_timer); |
| 1197 | |
| 1198 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { |
| 1199 | rtime = (rtime*HZ)/1000; |
| 1200 | if (rtime < HZ/10) |
| 1201 | rtime = HZ/10; |
| 1202 | in6_dev->nd_parms->retrans_time = rtime; |
| 1203 | in6_dev->tstamp = jiffies; |
| 1204 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1205 | } |
| 1206 | |
| 1207 | rtime = ntohl(ra_msg->reachable_time); |
| 1208 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { |
| 1209 | rtime = (rtime*HZ)/1000; |
| 1210 | |
| 1211 | if (rtime < HZ/10) |
| 1212 | rtime = HZ/10; |
| 1213 | |
| 1214 | if (rtime != in6_dev->nd_parms->base_reachable_time) { |
| 1215 | in6_dev->nd_parms->base_reachable_time = rtime; |
| 1216 | in6_dev->nd_parms->gc_staletime = 3 * rtime; |
| 1217 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
| 1218 | in6_dev->tstamp = jiffies; |
| 1219 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1220 | } |
| 1221 | } |
| 1222 | } |
| 1223 | |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1224 | skip_linkparms: |
| 1225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | /* |
| 1227 | * Process options. |
| 1228 | */ |
| 1229 | |
| 1230 | if (!neigh) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1231 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | skb->dev, 1); |
| 1233 | if (neigh) { |
| 1234 | u8 *lladdr = NULL; |
| 1235 | if (ndopts.nd_opts_src_lladdr) { |
| 1236 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 1237 | skb->dev); |
| 1238 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1239 | ND_PRINTK(2, warn, |
| 1240 | "RA: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | goto out; |
| 1242 | } |
| 1243 | } |
| 1244 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1245 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1246 | NEIGH_UPDATE_F_OVERRIDE| |
| 1247 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1248 | NEIGH_UPDATE_F_ISROUTER); |
| 1249 | } |
| 1250 | |
Thomas Graf | 65e9b62 | 2010-09-03 02:59:14 +0000 | [diff] [blame] | 1251 | if (!accept_ra(in6_dev)) |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1252 | goto out; |
| 1253 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1254 | #ifdef CONFIG_IPV6_ROUTE_INFO |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1255 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
| 1256 | goto skip_routeinfo; |
| 1257 | |
YOSHIFUJI Hideaki | 09c884d | 2006-03-20 17:07:03 -0800 | [diff] [blame] | 1258 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1259 | struct nd_opt_hdr *p; |
| 1260 | for (p = ndopts.nd_opts_ri; |
| 1261 | p; |
| 1262 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { |
YOSHIFUJI Hideaki | 6294e00 | 2008-03-15 23:56:52 -0400 | [diff] [blame] | 1263 | struct route_info *ri = (struct route_info *)p; |
| 1264 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
| 1265 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && |
| 1266 | ri->prefix_len == 0) |
| 1267 | continue; |
| 1268 | #endif |
| 1269 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
YOSHIFUJI Hideaki | 09c884d | 2006-03-20 17:07:03 -0800 | [diff] [blame] | 1270 | continue; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1271 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1272 | &ipv6_hdr(skb)->saddr); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1273 | } |
| 1274 | } |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1275 | |
| 1276 | skip_routeinfo: |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1277 | #endif |
| 1278 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1279 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1280 | /* skip link-specific ndopts from interior routers */ |
| 1281 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) |
| 1282 | goto out; |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1283 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1284 | |
YOSHIFUJI Hideaki | c4fd30e | 2006-03-20 16:55:26 -0800 | [diff] [blame] | 1285 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | struct nd_opt_hdr *p; |
| 1287 | for (p = ndopts.nd_opts_pi; |
| 1288 | p; |
| 1289 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { |
Neil Horman | e6bff99 | 2012-01-04 10:49:15 +0000 | [diff] [blame] | 1290 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
| 1291 | (p->nd_opt_len) << 3, |
| 1292 | ndopts.nd_opts_src_lladdr != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | } |
| 1294 | } |
| 1295 | |
| 1296 | if (ndopts.nd_opts_mtu) { |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1297 | __be32 n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | u32 mtu; |
| 1299 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1300 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
| 1301 | mtu = ntohl(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
| 1303 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1304 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | } else if (in6_dev->cnf.mtu6 != mtu) { |
| 1306 | in6_dev->cnf.mtu6 = mtu; |
| 1307 | |
| 1308 | if (rt) |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1309 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | |
| 1311 | rt6_mtu_change(skb->dev, mtu); |
| 1312 | } |
| 1313 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1314 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1315 | if (ndopts.nd_useropts) { |
YOSHIFUJI Hideaki | 61cf46ad | 2008-01-22 17:32:53 +0900 | [diff] [blame] | 1316 | struct nd_opt_hdr *p; |
| 1317 | for (p = ndopts.nd_useropts; |
| 1318 | p; |
| 1319 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { |
| 1320 | ndisc_ra_useropt(skb, p); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1321 | } |
| 1322 | } |
| 1323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1325 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | } |
| 1327 | out: |
| 1328 | if (rt) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1329 | dst_release(&rt->dst); |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1330 | if (neigh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | } |
| 1333 | |
| 1334 | static void ndisc_redirect_rcv(struct sk_buff *skb) |
| 1335 | { |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1336 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1337 | switch (skb->ndisc_nodetype) { |
| 1338 | case NDISC_NODETYPE_HOST: |
| 1339 | case NDISC_NODETYPE_NODEFAULT: |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1340 | ND_PRINTK(2, warn, |
| 1341 | "Redirect: from host or unauthorized router\n"); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1342 | return; |
| 1343 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1344 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1345 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1346 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1347 | ND_PRINTK(2, warn, |
| 1348 | "Redirect: source address is not link-local\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | return; |
| 1350 | } |
| 1351 | |
David S. Miller | b94f1c0 | 2012-07-12 00:33:37 -0700 | [diff] [blame] | 1352 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | } |
| 1354 | |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1355 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | { |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1357 | struct net_device *dev = skb->dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1358 | struct net *net = dev_net(dev); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1359 | struct sock *sk = net->ipv6.ndisc_sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 1361 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | struct sk_buff *buff; |
| 1363 | struct icmp6hdr *icmph; |
| 1364 | struct in6_addr saddr_buf; |
| 1365 | struct in6_addr *addrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | struct rt6_info *rt; |
| 1367 | struct dst_entry *dst; |
| 1368 | struct inet6_dev *idev; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1369 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | u8 *opt; |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 1371 | int hlen, tlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | int rd_len; |
| 1373 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 1375 | bool ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 1377 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1378 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
| 1379 | dev->name); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1380 | return; |
| 1381 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1383 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
Brian Haley | bf0b48d | 2007-10-08 00:12:05 -0700 | [diff] [blame] | 1384 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1385 | ND_PRINTK(2, warn, |
| 1386 | "Redirect: target address is not link-local unicast\n"); |
Li Yewang | 2955652 | 2007-01-30 14:33:20 -0800 | [diff] [blame] | 1387 | return; |
| 1388 | } |
| 1389 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1390 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
YOSHIFUJI Hideaki | 95e41e9 | 2007-12-06 15:43:30 -0800 | [diff] [blame] | 1391 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1393 | dst = ip6_route_output(net, NULL, &fl6); |
RongQing.Li | 5095d64 | 2012-02-21 22:10:49 +0000 | [diff] [blame] | 1394 | if (dst->error) { |
| 1395 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | return; |
RongQing.Li | 5095d64 | 2012-02-21 22:10:49 +0000 | [diff] [blame] | 1397 | } |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1398 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 1399 | if (IS_ERR(dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
| 1402 | rt = (struct rt6_info *) dst; |
| 1403 | |
| 1404 | if (rt->rt6i_flags & RTF_GATEWAY) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1405 | ND_PRINTK(2, warn, |
| 1406 | "Redirect: destination is not a neighbour\n"); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1407 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | } |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 1409 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
| 1410 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
| 1411 | if (peer) |
| 1412 | inet_putpeer(peer); |
| 1413 | if (!ret) |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1414 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | if (dev->addr_len) { |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1417 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
| 1418 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1419 | ND_PRINTK(2, warn, |
| 1420 | "Redirect: no neigh for target address\n"); |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1421 | goto release; |
| 1422 | } |
| 1423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | read_lock_bh(&neigh->lock); |
| 1425 | if (neigh->nud_state & NUD_VALID) { |
| 1426 | memcpy(ha_buf, neigh->ha, dev->addr_len); |
| 1427 | read_unlock_bh(&neigh->lock); |
| 1428 | ha = ha_buf; |
| 1429 | len += ndisc_opt_addr_space(dev); |
| 1430 | } else |
| 1431 | read_unlock_bh(&neigh->lock); |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1432 | |
| 1433 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | } |
| 1435 | |
| 1436 | rd_len = min_t(unsigned int, |
| 1437 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); |
| 1438 | rd_len &= ~0x7; |
| 1439 | len += rd_len; |
| 1440 | |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 1441 | hlen = LL_RESERVED_SPACE(dev); |
| 1442 | tlen = dev->needed_tailroom; |
David S. Miller | d54a81d | 2006-12-02 21:00:06 -0800 | [diff] [blame] | 1443 | buff = sock_alloc_send_skb(sk, |
| 1444 | (MAX_HEADER + sizeof(struct ipv6hdr) + |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 1445 | len + hlen + tlen), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | 1, &err); |
| 1447 | if (buff == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1448 | ND_PRINTK(0, err, |
| 1449 | "Redirect: %s failed to allocate an skb, err=%d\n", |
| 1450 | __func__, err); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1451 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 1454 | skb_reserve(buff, hlen); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1455 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | IPPROTO_ICMPV6, len); |
| 1457 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1458 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
Arnaldo Carvalho de Melo | d10ba34 | 2007-03-14 21:05:37 -0300 | [diff] [blame] | 1459 | skb_put(buff, len); |
| 1460 | icmph = icmp6_hdr(buff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | |
| 1462 | memset(icmph, 0, sizeof(struct icmp6hdr)); |
| 1463 | icmph->icmp6_type = NDISC_REDIRECT; |
| 1464 | |
| 1465 | /* |
| 1466 | * copy target and destination addresses |
| 1467 | */ |
| 1468 | |
| 1469 | addrp = (struct in6_addr *)(icmph + 1); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1470 | *addrp = *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | addrp++; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1472 | *addrp = ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | |
| 1474 | opt = (u8*) (addrp + 1); |
| 1475 | |
| 1476 | /* |
| 1477 | * include target_address option |
| 1478 | */ |
| 1479 | |
| 1480 | if (ha) |
| 1481 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, |
| 1482 | dev->addr_len, dev->type); |
| 1483 | |
| 1484 | /* |
| 1485 | * build redirect option and copy skb over to the new packet. |
| 1486 | */ |
| 1487 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1488 | memset(opt, 0, 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | *(opt++) = ND_OPT_REDIRECT_HDR; |
| 1490 | *(opt++) = (rd_len >> 3); |
| 1491 | opt += 6; |
| 1492 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1493 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1495 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | len, IPPROTO_ICMPV6, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 1497 | csum_partial(icmph, len, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1499 | skb_dst_set(buff, dst); |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1500 | rcu_read_lock(); |
| 1501 | idev = __in6_dev_get(dst->dev); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 1502 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 1503 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1504 | dst_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | if (!err) { |
Denis V. Lunev | 5c5d244 | 2008-10-08 10:33:50 -0700 | [diff] [blame] | 1506 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
Denis V. Lunev | a862f6a | 2008-10-08 10:33:06 -0700 | [diff] [blame] | 1507 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | } |
| 1509 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1510 | rcu_read_unlock(); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1511 | return; |
| 1512 | |
| 1513 | release: |
| 1514 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | } |
| 1516 | |
| 1517 | static void pndisc_redo(struct sk_buff *skb) |
| 1518 | { |
YOSHIFUJI Hideaki | 140e26fc | 2005-10-05 12:11:41 -0700 | [diff] [blame] | 1519 | ndisc_recv_ns(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | kfree_skb(skb); |
| 1521 | } |
| 1522 | |
| 1523 | int ndisc_rcv(struct sk_buff *skb) |
| 1524 | { |
| 1525 | struct nd_msg *msg; |
| 1526 | |
| 1527 | if (!pskb_may_pull(skb, skb->len)) |
| 1528 | return 0; |
| 1529 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1530 | msg = (struct nd_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1532 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1534 | if (ipv6_hdr(skb)->hop_limit != 255) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1535 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
| 1536 | ipv6_hdr(skb)->hop_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | return 0; |
| 1538 | } |
| 1539 | |
| 1540 | if (msg->icmph.icmp6_code != 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1541 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
| 1542 | msg->icmph.icmp6_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | return 0; |
| 1544 | } |
| 1545 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1546 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
| 1547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | switch (msg->icmph.icmp6_type) { |
| 1549 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 1550 | ndisc_recv_ns(skb); |
| 1551 | break; |
| 1552 | |
| 1553 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 1554 | ndisc_recv_na(skb); |
| 1555 | break; |
| 1556 | |
| 1557 | case NDISC_ROUTER_SOLICITATION: |
| 1558 | ndisc_recv_rs(skb); |
| 1559 | break; |
| 1560 | |
| 1561 | case NDISC_ROUTER_ADVERTISEMENT: |
| 1562 | ndisc_router_discovery(skb); |
| 1563 | break; |
| 1564 | |
| 1565 | case NDISC_REDIRECT: |
| 1566 | ndisc_redirect_rcv(skb); |
| 1567 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1568 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | |
| 1570 | return 0; |
| 1571 | } |
| 1572 | |
| 1573 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1574 | { |
| 1575 | struct net_device *dev = ptr; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1576 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | |
| 1578 | switch (event) { |
| 1579 | case NETDEV_CHANGEADDR: |
| 1580 | neigh_changeaddr(&nd_tbl, dev); |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1581 | fib6_run_gc(~0UL, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | break; |
| 1583 | case NETDEV_DOWN: |
| 1584 | neigh_ifdown(&nd_tbl, dev); |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1585 | fib6_run_gc(~0UL, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | break; |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 1587 | case NETDEV_NOTIFY_PEERS: |
| 1588 | ndisc_send_unsol_na(dev); |
| 1589 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | default: |
| 1591 | break; |
| 1592 | } |
| 1593 | |
| 1594 | return NOTIFY_DONE; |
| 1595 | } |
| 1596 | |
| 1597 | static struct notifier_block ndisc_netdev_notifier = { |
| 1598 | .notifier_call = ndisc_netdev_event, |
| 1599 | }; |
| 1600 | |
| 1601 | #ifdef CONFIG_SYSCTL |
| 1602 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, |
| 1603 | const char *func, const char *dev_name) |
| 1604 | { |
| 1605 | static char warncomm[TASK_COMM_LEN]; |
| 1606 | static int warned; |
| 1607 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 1608 | strcpy(warncomm, current->comm); |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 1609 | pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | warncomm, func, |
| 1611 | dev_name, ctl->procname, |
| 1612 | dev_name, ctl->procname); |
| 1613 | warned++; |
| 1614 | } |
| 1615 | } |
| 1616 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1617 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | { |
| 1619 | struct net_device *dev = ctl->extra1; |
| 1620 | struct inet6_dev *idev; |
| 1621 | int ret; |
| 1622 | |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1623 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
| 1624 | (strcmp(ctl->procname, "base_reachable_time") == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
| 1626 | |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1627 | if (strcmp(ctl->procname, "retrans_time") == 0) |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1628 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1629 | |
| 1630 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | ret = proc_dointvec_jiffies(ctl, write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1632 | buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1633 | |
| 1634 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || |
YOSHIFUJI Hideaki | ad02ac1 | 2007-10-29 01:32:23 -0700 | [diff] [blame] | 1635 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | ret = proc_dointvec_ms_jiffies(ctl, write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1637 | buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1638 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | ret = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | |
| 1641 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1642 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
| 1644 | idev->tstamp = jiffies; |
| 1645 | inet6_ifinfo_notify(RTM_NEWLINK, idev); |
| 1646 | in6_dev_put(idev); |
| 1647 | } |
| 1648 | return ret; |
| 1649 | } |
| 1650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | |
| 1652 | #endif |
| 1653 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1654 | static int __net_init ndisc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | { |
| 1656 | struct ipv6_pinfo *np; |
| 1657 | struct sock *sk; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1658 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1660 | err = inet_ctl_sock_create(&sk, PF_INET6, |
| 1661 | SOCK_RAW, IPPROTO_ICMPV6, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | if (err < 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1663 | ND_PRINTK(0, err, |
| 1664 | "NDISC: Failed to initialize the control socket (err %d)\n", |
| 1665 | err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | return err; |
| 1667 | } |
| 1668 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1669 | net->ipv6.ndisc_sk = sk; |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | np->hop_limit = 255; |
| 1673 | /* Do not loopback ndisc messages */ |
| 1674 | np->mc_loop = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1676 | return 0; |
| 1677 | } |
| 1678 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1679 | static void __net_exit ndisc_net_exit(struct net *net) |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1680 | { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1681 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1682 | } |
| 1683 | |
| 1684 | static struct pernet_operations ndisc_net_ops = { |
| 1685 | .init = ndisc_net_init, |
| 1686 | .exit = ndisc_net_exit, |
| 1687 | }; |
| 1688 | |
| 1689 | int __init ndisc_init(void) |
| 1690 | { |
| 1691 | int err; |
| 1692 | |
| 1693 | err = register_pernet_subsys(&ndisc_net_ops); |
| 1694 | if (err) |
| 1695 | return err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1696 | /* |
| 1697 | * Initialize the neighbour table |
| 1698 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | neigh_table_init(&nd_tbl); |
| 1700 | |
| 1701 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 54716e3 | 2010-02-14 03:27:03 +0000 | [diff] [blame] | 1702 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 1703 | &ndisc_ifinfo_sysctl_change); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1704 | if (err) |
| 1705 | goto out_unregister_pernet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | #endif |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1707 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
| 1708 | if (err) |
| 1709 | goto out_unregister_sysctl; |
| 1710 | out: |
| 1711 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1713 | out_unregister_sysctl: |
| 1714 | #ifdef CONFIG_SYSCTL |
| 1715 | neigh_sysctl_unregister(&nd_tbl.parms); |
| 1716 | out_unregister_pernet: |
| 1717 | #endif |
| 1718 | unregister_pernet_subsys(&ndisc_net_ops); |
| 1719 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | } |
| 1721 | |
| 1722 | void ndisc_cleanup(void) |
| 1723 | { |
Dmitry Mishin | 36f73d0 | 2006-11-03 16:08:19 -0800 | [diff] [blame] | 1724 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | #ifdef CONFIG_SYSCTL |
| 1726 | neigh_sysctl_unregister(&nd_tbl.parms); |
| 1727 | #endif |
| 1728 | neigh_table_clear(&nd_tbl); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1729 | unregister_pernet_subsys(&ndisc_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | } |