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 | |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 146 | static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 148 | int pad = ndisc_addr_option_pad(skb->dev->type); |
| 149 | int data_len = skb->dev->addr_len; |
| 150 | int space = ndisc_opt_addr_space(skb->dev); |
| 151 | u8 *opt = skb_put(skb, space); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | opt[0] = type; |
| 154 | opt[1] = space>>3; |
| 155 | |
| 156 | memset(opt + 2, 0, pad); |
| 157 | opt += pad; |
| 158 | space -= pad; |
| 159 | |
| 160 | memcpy(opt+2, data, data_len); |
| 161 | data_len += 2; |
| 162 | opt += data_len; |
| 163 | if ((space -= data_len) > 0) |
| 164 | memset(opt, 0, space); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
| 168 | struct nd_opt_hdr *end) |
| 169 | { |
| 170 | int type; |
| 171 | if (!cur || !end || cur >= end) |
| 172 | return NULL; |
| 173 | type = cur->nd_opt_type; |
| 174 | do { |
| 175 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
| 176 | } while(cur < end && cur->nd_opt_type != type); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 177 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 180 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
| 181 | { |
Alexey I. Froloff | e35f30c | 2012-04-06 05:50:58 +0000 | [diff] [blame] | 182 | return opt->nd_opt_type == ND_OPT_RDNSS || |
| 183 | opt->nd_opt_type == ND_OPT_DNSSL; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, |
| 187 | struct nd_opt_hdr *end) |
| 188 | { |
| 189 | if (!cur || !end || cur >= end) |
| 190 | return NULL; |
| 191 | do { |
| 192 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
| 193 | } while(cur < end && !ndisc_is_useropt(cur)); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 194 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 195 | } |
| 196 | |
David S. Miller | 30f2a5f | 2012-07-11 23:26:46 -0700 | [diff] [blame] | 197 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
| 198 | struct ndisc_options *ndopts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
| 200 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; |
| 201 | |
| 202 | if (!nd_opt || opt_len < 0 || !ndopts) |
| 203 | return NULL; |
| 204 | memset(ndopts, 0, sizeof(*ndopts)); |
| 205 | while (opt_len) { |
| 206 | int l; |
| 207 | if (opt_len < sizeof(struct nd_opt_hdr)) |
| 208 | return NULL; |
| 209 | l = nd_opt->nd_opt_len << 3; |
| 210 | if (opt_len < l || l == 0) |
| 211 | return NULL; |
| 212 | switch (nd_opt->nd_opt_type) { |
| 213 | case ND_OPT_SOURCE_LL_ADDR: |
| 214 | case ND_OPT_TARGET_LL_ADDR: |
| 215 | case ND_OPT_MTU: |
| 216 | case ND_OPT_REDIRECT_HDR: |
| 217 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 218 | ND_PRINTK(2, warn, |
| 219 | "%s: duplicated ND6 option found: type=%d\n", |
| 220 | __func__, nd_opt->nd_opt_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } else { |
| 222 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 223 | } |
| 224 | break; |
| 225 | case ND_OPT_PREFIX_INFO: |
| 226 | ndopts->nd_opts_pi_end = nd_opt; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 227 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 229 | break; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 230 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 231 | case ND_OPT_ROUTE_INFO: |
| 232 | ndopts->nd_opts_ri_end = nd_opt; |
| 233 | if (!ndopts->nd_opts_ri) |
| 234 | ndopts->nd_opts_ri = nd_opt; |
| 235 | break; |
| 236 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | default: |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 238 | if (ndisc_is_useropt(nd_opt)) { |
| 239 | ndopts->nd_useropts_end = nd_opt; |
| 240 | if (!ndopts->nd_useropts) |
| 241 | ndopts->nd_useropts = nd_opt; |
| 242 | } else { |
| 243 | /* |
| 244 | * Unknown options must be silently ignored, |
| 245 | * to accommodate future extension to the |
| 246 | * protocol. |
| 247 | */ |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 248 | ND_PRINTK(2, notice, |
| 249 | "%s: ignored unsupported option; type=%d, len=%d\n", |
| 250 | __func__, |
| 251 | nd_opt->nd_opt_type, |
| 252 | nd_opt->nd_opt_len); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 253 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | opt_len -= l; |
| 256 | nd_opt = ((void *)nd_opt) + l; |
| 257 | } |
| 258 | return ndopts; |
| 259 | } |
| 260 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 261 | 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] | 262 | { |
| 263 | switch (dev->type) { |
| 264 | case ARPHRD_ETHER: |
| 265 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ |
| 266 | case ARPHRD_FDDI: |
| 267 | ipv6_eth_mc_map(addr, buf); |
| 268 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | case ARPHRD_ARCNET: |
| 270 | ipv6_arcnet_mc_map(addr, buf); |
| 271 | return 0; |
| 272 | case ARPHRD_INFINIBAND: |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 273 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | return 0; |
Timo Teräs | 93ca3bb | 2011-03-28 22:40:53 +0000 | [diff] [blame] | 275 | case ARPHRD_IPGRE: |
| 276 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | default: |
| 278 | if (dir) { |
| 279 | memcpy(buf, dev->broadcast, dev->addr_len); |
| 280 | return 0; |
| 281 | } |
| 282 | } |
| 283 | return -EINVAL; |
| 284 | } |
| 285 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 286 | EXPORT_SYMBOL(ndisc_mc_map); |
| 287 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 288 | static u32 ndisc_hash(const void *pkey, |
| 289 | const struct net_device *dev, |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 290 | __u32 *hash_rnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | { |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 292 | return ndisc_hashfn(pkey, dev, hash_rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | static int ndisc_constructor(struct neighbour *neigh) |
| 296 | { |
| 297 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; |
| 298 | struct net_device *dev = neigh->dev; |
| 299 | struct inet6_dev *in6_dev; |
| 300 | struct neigh_parms *parms; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 301 | bool is_multicast = ipv6_addr_is_multicast(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | in6_dev = in6_dev_get(dev); |
| 304 | if (in6_dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | return -EINVAL; |
| 306 | } |
| 307 | |
| 308 | parms = in6_dev->nd_parms; |
| 309 | __neigh_parms_put(neigh->parms); |
| 310 | neigh->parms = neigh_parms_clone(parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 313 | if (!dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | neigh->nud_state = NUD_NOARP; |
| 315 | neigh->ops = &ndisc_direct_ops; |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 316 | neigh->output = neigh_direct_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } else { |
| 318 | if (is_multicast) { |
| 319 | neigh->nud_state = NUD_NOARP; |
| 320 | ndisc_mc_map(addr, neigh->ha, dev, 1); |
| 321 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { |
| 322 | neigh->nud_state = NUD_NOARP; |
| 323 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); |
| 324 | if (dev->flags&IFF_LOOPBACK) |
| 325 | neigh->type = RTN_LOCAL; |
| 326 | } else if (dev->flags&IFF_POINTOPOINT) { |
| 327 | neigh->nud_state = NUD_NOARP; |
| 328 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); |
| 329 | } |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 330 | if (dev->header_ops->cache) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | neigh->ops = &ndisc_hh_ops; |
| 332 | else |
| 333 | neigh->ops = &ndisc_generic_ops; |
| 334 | if (neigh->nud_state&NUD_VALID) |
| 335 | neigh->output = neigh->ops->connected_output; |
| 336 | else |
| 337 | neigh->output = neigh->ops->output; |
| 338 | } |
| 339 | in6_dev_put(in6_dev); |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static int pndisc_constructor(struct pneigh_entry *n) |
| 344 | { |
| 345 | struct in6_addr *addr = (struct in6_addr*)&n->key; |
| 346 | struct in6_addr maddr; |
| 347 | struct net_device *dev = n->dev; |
| 348 | |
| 349 | if (dev == NULL || __in6_dev_get(dev) == NULL) |
| 350 | return -EINVAL; |
| 351 | addrconf_addr_solict_mult(addr, &maddr); |
| 352 | ipv6_dev_mc_inc(dev, &maddr); |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | static void pndisc_destructor(struct pneigh_entry *n) |
| 357 | { |
| 358 | struct in6_addr *addr = (struct in6_addr*)&n->key; |
| 359 | struct in6_addr maddr; |
| 360 | struct net_device *dev = n->dev; |
| 361 | |
| 362 | if (dev == NULL || __in6_dev_get(dev) == NULL) |
| 363 | return; |
| 364 | addrconf_addr_solict_mult(addr, &maddr); |
| 365 | ipv6_dev_mc_dec(dev, &maddr); |
| 366 | } |
| 367 | |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 368 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
| 369 | int len) |
| 370 | { |
| 371 | int hlen = LL_RESERVED_SPACE(dev); |
| 372 | int tlen = dev->needed_tailroom; |
| 373 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; |
| 374 | struct sk_buff *skb; |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 375 | |
Thomas Graf | 25a6e6b | 2013-09-03 13:37:01 +0200 | [diff] [blame] | 376 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 377 | if (!skb) { |
Thomas Graf | 25a6e6b | 2013-09-03 13:37:01 +0200 | [diff] [blame] | 378 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
| 379 | __func__); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 380 | return NULL; |
| 381 | } |
| 382 | |
YOSHIFUJI Hideaki / 吉藤英明 | f382d03 | 2013-01-21 06:48:29 +0000 | [diff] [blame] | 383 | skb->protocol = htons(ETH_P_IPV6); |
| 384 | skb->dev = dev; |
| 385 | |
YOSHIFUJI Hideaki / 吉藤英明 | 527a150 | 2013-01-21 06:48:39 +0000 | [diff] [blame] | 386 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki / 吉藤英明 | 5135e63 | 2013-01-21 06:48:44 +0000 | [diff] [blame] | 387 | skb_reset_transport_header(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 388 | |
Thomas Graf | 25a6e6b | 2013-09-03 13:37:01 +0200 | [diff] [blame] | 389 | /* Manually assign socket ownership as we avoid calling |
| 390 | * sock_alloc_send_pskb() to bypass wmem buffer limits |
| 391 | */ |
| 392 | skb_set_owner_w(skb, sk); |
| 393 | |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 394 | return skb; |
| 395 | } |
| 396 | |
YOSHIFUJI Hideaki / 吉藤英明 | f382d03 | 2013-01-21 06:48:29 +0000 | [diff] [blame] | 397 | static void ip6_nd_hdr(struct sk_buff *skb, |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 398 | const struct in6_addr *saddr, |
| 399 | const struct in6_addr *daddr, |
YOSHIFUJI Hideaki / 吉藤英明 | c8d6c38 | 2013-01-21 06:48:24 +0000 | [diff] [blame] | 400 | int hop_limit, int len) |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 401 | { |
| 402 | struct ipv6hdr *hdr; |
| 403 | |
YOSHIFUJI Hideaki / 吉藤英明 | 527a150 | 2013-01-21 06:48:39 +0000 | [diff] [blame] | 404 | skb_push(skb, sizeof(*hdr)); |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 405 | skb_reset_network_header(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 406 | hdr = ipv6_hdr(skb); |
| 407 | |
| 408 | ip6_flow_hdr(hdr, 0, 0); |
| 409 | |
| 410 | hdr->payload_len = htons(len); |
YOSHIFUJI Hideaki / 吉藤英明 | c8d6c38 | 2013-01-21 06:48:24 +0000 | [diff] [blame] | 411 | hdr->nexthdr = IPPROTO_ICMPV6; |
| 412 | hdr->hop_limit = hop_limit; |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 413 | |
| 414 | hdr->saddr = *saddr; |
| 415 | hdr->daddr = *daddr; |
| 416 | } |
| 417 | |
YOSHIFUJI Hideaki / 吉藤英明 | af9a997 | 2013-01-21 06:48:34 +0000 | [diff] [blame] | 418 | static void ndisc_send_skb(struct sk_buff *skb, |
YOSHIFUJI Hideaki | fd0ea7d | 2012-12-13 02:40:26 +0900 | [diff] [blame] | 419 | const struct in6_addr *daddr, |
YOSHIFUJI Hideaki / 吉藤英明 | aa4bdd4 | 2013-01-21 06:48:58 +0000 | [diff] [blame] | 420 | const struct in6_addr *saddr) |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 421 | { |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 422 | struct dst_entry *dst = skb_dst(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | af9a997 | 2013-01-21 06:48:34 +0000 | [diff] [blame] | 423 | struct net *net = dev_net(skb->dev); |
YOSHIFUJI Hideaki / 吉藤英明 | 7b3d9b0 | 2013-01-21 06:49:08 +0000 | [diff] [blame] | 424 | struct sock *sk = net->ipv6.ndisc_sk; |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 425 | struct inet6_dev *idev; |
| 426 | int err; |
YOSHIFUJI Hideaki / 吉藤英明 | aa4bdd4 | 2013-01-21 06:48:58 +0000 | [diff] [blame] | 427 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 428 | u8 type; |
| 429 | |
| 430 | type = icmp6h->icmp6_type; |
| 431 | |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 432 | if (!dst) { |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 433 | struct flowi6 fl6; |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 434 | |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 435 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex); |
| 436 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
| 437 | if (IS_ERR(dst)) { |
| 438 | kfree_skb(skb); |
| 439 | return; |
| 440 | } |
| 441 | |
| 442 | skb_dst_set(skb, dst); |
| 443 | } |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 444 | |
YOSHIFUJI Hideaki / 吉藤英明 | 7b3d9b0 | 2013-01-21 06:49:08 +0000 | [diff] [blame] | 445 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
| 446 | IPPROTO_ICMPV6, |
| 447 | csum_partial(icmp6h, |
| 448 | skb->len, 0)); |
| 449 | |
| 450 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); |
| 451 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 452 | rcu_read_lock(); |
| 453 | idev = __in6_dev_get(dst->dev); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 454 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 455 | |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 456 | 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] | 457 | dst_output); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 458 | if (!err) { |
Denis V. Lunev | 5c5d244 | 2008-10-08 10:33:50 -0700 | [diff] [blame] | 459 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
Denis V. Lunev | a862f6a | 2008-10-08 10:33:06 -0700 | [diff] [blame] | 460 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 461 | } |
| 462 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 463 | rcu_read_unlock(); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 464 | } |
| 465 | |
Cong Wang | f564f45 | 2013-08-31 13:44:36 +0800 | [diff] [blame] | 466 | void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
| 467 | const struct in6_addr *daddr, |
| 468 | const struct in6_addr *solicited_addr, |
| 469 | bool router, bool solicited, bool override, bool inc_opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 471 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct in6_addr tmpaddr; |
| 473 | struct inet6_ifaddr *ifp; |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 474 | const struct in6_addr *src_addr; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 475 | struct nd_msg *msg; |
| 476 | int optlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
| 478 | /* for anycast or proxy, solicited_addr != src_addr */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 479 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 480 | if (ifp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | src_addr = solicited_addr; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 482 | if (ifp->flags & IFA_F_OPTIMISTIC) |
Daniel Baluta | f2f79cc | 2013-07-13 11:26:51 +0300 | [diff] [blame] | 483 | override = false; |
stephen hemminger | 9f88816 | 2010-06-21 11:00:13 +0000 | [diff] [blame] | 484 | inc_opt |= ifp->idev->cnf.force_tllao; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | in6_ifa_put(ifp); |
| 486 | } else { |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 487 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 488 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 489 | &tmpaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | return; |
| 491 | src_addr = &tmpaddr; |
| 492 | } |
| 493 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 494 | if (!dev->addr_len) |
| 495 | inc_opt = 0; |
| 496 | if (inc_opt) |
| 497 | optlen += ndisc_opt_addr_space(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 499 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 500 | if (!skb) |
| 501 | return; |
| 502 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 503 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
| 504 | *msg = (struct nd_msg) { |
| 505 | .icmph = { |
| 506 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, |
| 507 | .icmp6_router = router, |
| 508 | .icmp6_solicited = solicited, |
| 509 | .icmp6_override = override, |
| 510 | }, |
| 511 | .target = *solicited_addr, |
| 512 | }; |
| 513 | |
| 514 | if (inc_opt) |
| 515 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, |
| 516 | dev->dev_addr); |
| 517 | |
| 518 | |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 519 | ndisc_send_skb(skb, daddr, src_addr); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 520 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 522 | static void ndisc_send_unsol_na(struct net_device *dev) |
| 523 | { |
| 524 | struct inet6_dev *idev; |
| 525 | struct inet6_ifaddr *ifa; |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 526 | |
| 527 | idev = in6_dev_get(dev); |
| 528 | if (!idev) |
| 529 | return; |
| 530 | |
| 531 | read_lock_bh(&idev->lock); |
| 532 | list_for_each_entry(ifa, &idev->addr_list, if_list) { |
YOSHIFUJI Hideaki / 吉藤英明 | 9fafd65 | 2012-11-12 07:50:17 +0000 | [diff] [blame] | 533 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 534 | /*router=*/ !!idev->cnf.forwarding, |
| 535 | /*solicited=*/ false, /*override=*/ true, |
| 536 | /*inc_opt=*/ true); |
| 537 | } |
| 538 | read_unlock_bh(&idev->lock); |
| 539 | |
| 540 | in6_dev_put(idev); |
| 541 | } |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 544 | const struct in6_addr *solicit, |
| 545 | const struct in6_addr *daddr, const struct in6_addr *saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 547 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | struct in6_addr addr_buf; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 549 | int inc_opt = dev->addr_len; |
| 550 | int optlen = 0; |
| 551 | struct nd_msg *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | if (saddr == NULL) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 554 | if (ipv6_get_lladdr(dev, &addr_buf, |
| 555 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | return; |
| 557 | saddr = &addr_buf; |
| 558 | } |
| 559 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 560 | if (ipv6_addr_any(saddr)) |
Daniel Baluta | f2f79cc | 2013-07-13 11:26:51 +0300 | [diff] [blame] | 561 | inc_opt = false; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 562 | if (inc_opt) |
| 563 | optlen += ndisc_opt_addr_space(dev); |
| 564 | |
| 565 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 566 | if (!skb) |
| 567 | return; |
| 568 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 569 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
| 570 | *msg = (struct nd_msg) { |
| 571 | .icmph = { |
| 572 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, |
| 573 | }, |
| 574 | .target = *solicit, |
| 575 | }; |
| 576 | |
| 577 | if (inc_opt) |
| 578 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, |
| 579 | dev->dev_addr); |
| 580 | |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 581 | ndisc_send_skb(skb, daddr, saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 584 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
| 585 | const struct in6_addr *daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | { |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 587 | struct sk_buff *skb; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 588 | struct rs_msg *msg; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 589 | int send_sllao = dev->addr_len; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 590 | int optlen = 0; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 591 | |
| 592 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 593 | /* |
| 594 | * According to section 2.2 of RFC 4429, we must not |
| 595 | * send router solicitations with a sllao from |
| 596 | * optimistic addresses, but we may send the solicitation |
| 597 | * if we don't include the sllao. So here we check |
| 598 | * if our address is optimistic, and if so, we |
Joe Perches | bea8519 | 2007-12-20 14:01:35 -0800 | [diff] [blame] | 599 | * suppress the inclusion of the sllao. |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 600 | */ |
| 601 | if (send_sllao) { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 602 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
Daniel Lezcano | 1cab3da | 2008-01-10 22:44:09 -0800 | [diff] [blame] | 603 | dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 604 | if (ifp) { |
| 605 | if (ifp->flags & IFA_F_OPTIMISTIC) { |
YOSHIFUJI Hideaki | ca04356 | 2007-02-28 23:13:20 +0900 | [diff] [blame] | 606 | send_sllao = 0; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 607 | } |
YOSHIFUJI Hideaki | ca04356 | 2007-02-28 23:13:20 +0900 | [diff] [blame] | 608 | in6_ifa_put(ifp); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 609 | } else { |
| 610 | send_sllao = 0; |
| 611 | } |
| 612 | } |
| 613 | #endif |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 614 | if (send_sllao) |
| 615 | optlen += ndisc_opt_addr_space(dev); |
| 616 | |
| 617 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 618 | if (!skb) |
| 619 | return; |
| 620 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 621 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
| 622 | *msg = (struct rs_msg) { |
| 623 | .icmph = { |
| 624 | .icmp6_type = NDISC_ROUTER_SOLICITATION, |
| 625 | }, |
| 626 | }; |
| 627 | |
| 628 | if (send_sllao) |
| 629 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, |
| 630 | dev->dev_addr); |
| 631 | |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 632 | ndisc_send_skb(skb, daddr, saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
| 636 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) |
| 637 | { |
| 638 | /* |
| 639 | * "The sender MUST return an ICMP |
| 640 | * destination unreachable" |
| 641 | */ |
| 642 | dst_link_failure(skb); |
| 643 | kfree_skb(skb); |
| 644 | } |
| 645 | |
| 646 | /* Called with locked neigh: either read or both */ |
| 647 | |
| 648 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) |
| 649 | { |
| 650 | struct in6_addr *saddr = NULL; |
| 651 | struct in6_addr mcaddr; |
| 652 | struct net_device *dev = neigh->dev; |
| 653 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; |
| 654 | int probes = atomic_read(&neigh->probes); |
| 655 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 656 | 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] | 657 | saddr = &ipv6_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
| 659 | if ((probes -= neigh->parms->ucast_probes) < 0) { |
| 660 | if (!(neigh->nud_state & NUD_VALID)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 661 | ND_PRINTK(1, dbg, |
| 662 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", |
| 663 | __func__, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | ndisc_send_ns(dev, neigh, target, target, saddr); |
| 666 | } else if ((probes -= neigh->parms->app_probes) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | neigh_app_ns(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } else { |
| 669 | addrconf_addr_solict_mult(target, &mcaddr); |
| 670 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); |
| 671 | } |
| 672 | } |
| 673 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 674 | static int pndisc_is_router(const void *pkey, |
| 675 | struct net_device *dev) |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 676 | { |
| 677 | struct pneigh_entry *n; |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 678 | int ret = -1; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 679 | |
| 680 | read_lock_bh(&nd_tbl.lock); |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 681 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
| 682 | if (n) |
| 683 | ret = !!(n->flags & NTF_ROUTER); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 684 | read_unlock_bh(&nd_tbl.lock); |
| 685 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 686 | return ret; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 687 | } |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | static void ndisc_recv_ns(struct sk_buff *skb) |
| 690 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 691 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 692 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
| 693 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | u8 *lladdr = NULL; |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 695 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 696 | offsetof(struct nd_msg, opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | struct ndisc_options ndopts; |
| 698 | struct net_device *dev = skb->dev; |
| 699 | struct inet6_ifaddr *ifp; |
| 700 | struct inet6_dev *idev = NULL; |
| 701 | struct neighbour *neigh; |
| 702 | int dad = ipv6_addr_any(saddr); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 703 | bool inc; |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 704 | int is_router = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
YOSHIFUJI Hideaki / 吉藤英明 | 115b0aa | 2013-01-18 02:05:03 +0000 | [diff] [blame] | 706 | if (skb->len < sizeof(struct nd_msg)) { |
| 707 | ND_PRINTK(2, warn, "NS: packet too short\n"); |
| 708 | return; |
| 709 | } |
| 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | if (ipv6_addr_is_multicast(&msg->target)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 712 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | return; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * RFC2461 7.1.1: |
| 718 | * DAD has to be destined for solicited node multicast address. |
| 719 | */ |
YOSHIFUJI Hideaki / 吉藤英明 | ca97a64 | 2013-01-20 07:39:00 +0000 | [diff] [blame] | 720 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 721 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | return; |
| 723 | } |
| 724 | |
| 725 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 726 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | return; |
| 728 | } |
| 729 | |
| 730 | if (ndopts.nd_opts_src_lladdr) { |
| 731 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); |
| 732 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 733 | ND_PRINTK(2, warn, |
| 734 | "NS: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | return; |
| 736 | } |
| 737 | |
| 738 | /* RFC2461 7.1.1: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 739 | * If the IP source address is the unspecified address, |
| 740 | * there MUST NOT be source link-layer address option |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | * in the message. |
| 742 | */ |
| 743 | if (dad) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 744 | ND_PRINTK(2, warn, |
| 745 | "NS: bad DAD packet (link-layer address option)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | return; |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | inc = ipv6_addr_is_multicast(daddr); |
| 751 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 752 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 753 | if (ifp) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 754 | |
| 755 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
| 756 | if (dad) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 757 | /* |
| 758 | * We are colliding with another node |
| 759 | * who is doing DAD |
| 760 | * so fail our DAD process |
| 761 | */ |
| 762 | addrconf_dad_failure(ifp); |
Denis V. Lunev | 9e3be4b | 2007-09-11 11:04:49 +0200 | [diff] [blame] | 763 | return; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 764 | } else { |
| 765 | /* |
| 766 | * This is not a dad solicitation. |
| 767 | * If we are an optimistic node, |
| 768 | * we should respond. |
| 769 | * Otherwise, we should ignore it. |
| 770 | */ |
| 771 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) |
| 772 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
| 776 | idev = ifp->idev; |
| 777 | } else { |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 778 | struct net *net = dev_net(dev); |
| 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | idev = in6_dev_get(dev); |
| 781 | if (!idev) { |
| 782 | /* XXX: count this drop? */ |
| 783 | return; |
| 784 | } |
| 785 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 786 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 787 | (idev->cnf.forwarding && |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 788 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 789 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 790 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | skb->pkt_type != PACKET_HOST && |
Daniel Baluta | f2f79cc | 2013-07-13 11:26:51 +0300 | [diff] [blame] | 792 | inc && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | idev->nd_parms->proxy_delay != 0) { |
| 794 | /* |
| 795 | * for anycast or proxy, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 796 | * sender should delay its response |
| 797 | * by a random time between 0 and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | * MAX_ANYCAST_DELAY_TIME seconds. |
| 799 | * (RFC2461) -- yoshfuji |
| 800 | */ |
| 801 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); |
| 802 | if (n) |
| 803 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); |
| 804 | goto out; |
| 805 | } |
| 806 | } else |
| 807 | goto out; |
| 808 | } |
| 809 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 810 | if (is_router < 0) |
YOSHIFUJI Hideaki / 吉藤英明 | fb56863 | 2013-01-20 07:39:18 +0000 | [diff] [blame] | 811 | is_router = idev->cnf.forwarding; |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | if (dad) { |
YOSHIFUJI Hideaki | f3ee401 | 2008-04-10 15:42:11 +0900 | [diff] [blame] | 814 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
YOSHIFUJI Hideaki / 吉藤英明 | fb56863 | 2013-01-20 07:39:18 +0000 | [diff] [blame] | 815 | !!is_router, false, (ifp != NULL), true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | goto out; |
| 817 | } |
| 818 | |
| 819 | if (inc) |
| 820 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); |
| 821 | else |
| 822 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); |
| 823 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 824 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | * update / create cache entry |
| 826 | * for the source address |
| 827 | */ |
| 828 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, |
| 829 | !inc || lladdr || !dev->addr_len); |
| 830 | if (neigh) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 831 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 833 | NEIGH_UPDATE_F_OVERRIDE); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 834 | if (neigh || !dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
YOSHIFUJI Hideaki / 吉藤英明 | fb56863 | 2013-01-20 07:39:18 +0000 | [diff] [blame] | 836 | !!is_router, |
| 837 | true, (ifp != NULL && inc), inc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | if (neigh) |
| 839 | neigh_release(neigh); |
| 840 | } |
| 841 | |
| 842 | out: |
| 843 | if (ifp) |
| 844 | in6_ifa_put(ifp); |
| 845 | else |
| 846 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | static void ndisc_recv_na(struct sk_buff *skb) |
| 850 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 851 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 852 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
| 853 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | u8 *lladdr = NULL; |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 855 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 856 | offsetof(struct nd_msg, opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | struct ndisc_options ndopts; |
| 858 | struct net_device *dev = skb->dev; |
| 859 | struct inet6_ifaddr *ifp; |
| 860 | struct neighbour *neigh; |
| 861 | |
| 862 | if (skb->len < sizeof(struct nd_msg)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 863 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | return; |
| 865 | } |
| 866 | |
| 867 | if (ipv6_addr_is_multicast(&msg->target)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 868 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | return; |
| 870 | } |
| 871 | |
| 872 | if (ipv6_addr_is_multicast(daddr) && |
| 873 | msg->icmph.icmp6_solicited) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 874 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return; |
| 876 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 879 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | return; |
| 881 | } |
| 882 | if (ndopts.nd_opts_tgt_lladdr) { |
| 883 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); |
| 884 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 885 | ND_PRINTK(2, warn, |
| 886 | "NA: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | return; |
| 888 | } |
| 889 | } |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 890 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 891 | if (ifp) { |
Daniel Walter | bd01592 | 2011-04-13 21:09:25 +0000 | [diff] [blame] | 892 | if (skb->pkt_type != PACKET_LOOPBACK |
| 893 | && (ifp->flags & IFA_F_TENTATIVE)) { |
| 894 | addrconf_dad_failure(ifp); |
| 895 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | /* What should we make now? The advertisement |
| 898 | is invalid, but ndisc specs say nothing |
| 899 | about it. It could be misconfiguration, or |
| 900 | an smart proxy agent tries to help us :-) |
Jan Sembera | 24fc7b8 | 2008-12-09 15:48:32 -0800 | [diff] [blame] | 901 | |
| 902 | We should not print the error if NA has been |
| 903 | received from loopback - it is just our own |
| 904 | unsolicited advertisement. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | */ |
Jan Sembera | 24fc7b8 | 2008-12-09 15:48:32 -0800 | [diff] [blame] | 906 | if (skb->pkt_type != PACKET_LOOPBACK) |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 907 | ND_PRINTK(1, warn, |
| 908 | "NA: someone advertises our address %pI6 on %s!\n", |
| 909 | &ifp->addr, ifp->idev->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | in6_ifa_put(ifp); |
| 911 | return; |
| 912 | } |
| 913 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); |
| 914 | |
| 915 | if (neigh) { |
| 916 | u8 old_flags = neigh->flags; |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 917 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | if (neigh->nud_state & NUD_FAILED) |
| 920 | goto out; |
| 921 | |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 922 | /* |
| 923 | * Don't update the neighbor cache entry on a proxy NA from |
| 924 | * ourselves because either the proxied node is off link or it |
| 925 | * has already sent a NA to us. |
| 926 | */ |
| 927 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 928 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
| 929 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { |
Nicolas Dichtel | b20b6d9 | 2012-11-07 05:05:38 +0000 | [diff] [blame] | 930 | /* XXX: idev->cnf.proxy_ndp */ |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 931 | goto out; |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 932 | } |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | neigh_update(neigh, lladdr, |
| 935 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
| 936 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 937 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| |
| 938 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 939 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); |
| 940 | |
| 941 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { |
| 942 | /* |
| 943 | * Change: router to host |
| 944 | */ |
| 945 | struct rt6_info *rt; |
| 946 | rt = rt6_get_dflt_router(saddr, dev); |
| 947 | if (rt) |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 948 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | out: |
| 952 | neigh_release(neigh); |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | static void ndisc_recv_rs(struct sk_buff *skb) |
| 957 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 958 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
| 960 | struct neighbour *neigh; |
| 961 | struct inet6_dev *idev; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 962 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | struct ndisc_options ndopts; |
| 964 | u8 *lladdr = NULL; |
| 965 | |
| 966 | if (skb->len < sizeof(*rs_msg)) |
| 967 | return; |
| 968 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 969 | idev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (!idev) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 971 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | return; |
| 973 | } |
| 974 | |
| 975 | /* Don't accept RS if we're not in router mode */ |
| 976 | if (!idev->cnf.forwarding) |
| 977 | goto out; |
| 978 | |
| 979 | /* |
| 980 | * Don't update NCE if src = ::; |
| 981 | * this implies that the source node has no ip address assigned yet. |
| 982 | */ |
| 983 | if (ipv6_addr_any(saddr)) |
| 984 | goto out; |
| 985 | |
| 986 | /* Parse ND options */ |
| 987 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 988 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | goto out; |
| 990 | } |
| 991 | |
| 992 | if (ndopts.nd_opts_src_lladdr) { |
| 993 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 994 | skb->dev); |
| 995 | if (!lladdr) |
| 996 | goto out; |
| 997 | } |
| 998 | |
| 999 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); |
| 1000 | if (neigh) { |
| 1001 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1002 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1003 | NEIGH_UPDATE_F_OVERRIDE| |
| 1004 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); |
| 1005 | neigh_release(neigh); |
| 1006 | } |
| 1007 | out: |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1008 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | } |
| 1010 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1011 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
| 1012 | { |
| 1013 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); |
| 1014 | struct sk_buff *skb; |
| 1015 | struct nlmsghdr *nlh; |
| 1016 | struct nduseroptmsg *ndmsg; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1017 | struct net *net = dev_net(ra->dev); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1018 | int err; |
| 1019 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) |
| 1020 | + (opt->nd_opt_len << 3)); |
| 1021 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); |
| 1022 | |
| 1023 | skb = nlmsg_new(msg_size, GFP_ATOMIC); |
| 1024 | if (skb == NULL) { |
| 1025 | err = -ENOBUFS; |
| 1026 | goto errout; |
| 1027 | } |
| 1028 | |
| 1029 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); |
| 1030 | if (nlh == NULL) { |
| 1031 | goto nla_put_failure; |
| 1032 | } |
| 1033 | |
| 1034 | ndmsg = nlmsg_data(nlh); |
| 1035 | ndmsg->nduseropt_family = AF_INET6; |
Pierre Ynard | dbb2ed2 | 2007-11-12 17:58:35 -0800 | [diff] [blame] | 1036 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1037 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
| 1038 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; |
| 1039 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; |
| 1040 | |
| 1041 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); |
| 1042 | |
David S. Miller | c78679e | 2012-04-01 20:27:33 -0400 | [diff] [blame] | 1043 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
| 1044 | &ipv6_hdr(ra)->saddr)) |
| 1045 | goto nla_put_failure; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1046 | nlmsg_end(skb, nlh); |
| 1047 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1048 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1049 | return; |
| 1050 | |
| 1051 | nla_put_failure: |
| 1052 | nlmsg_free(skb); |
| 1053 | err = -EMSGSIZE; |
| 1054 | errout: |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 1055 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1056 | } |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | static void ndisc_router_discovery(struct sk_buff *skb) |
| 1059 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1060 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | struct neighbour *neigh = NULL; |
| 1062 | struct inet6_dev *in6_dev; |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1063 | struct rt6_info *rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | int lifetime; |
| 1065 | struct ndisc_options ndopts; |
| 1066 | int optlen; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1067 | unsigned int pref = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
| 1069 | __u8 * opt = (__u8 *)(ra_msg + 1); |
| 1070 | |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 1071 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
| 1072 | sizeof(struct ra_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1074 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1075 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | return; |
| 1077 | } |
| 1078 | if (optlen < 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1079 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | return; |
| 1081 | } |
| 1082 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1083 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1084 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1085 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1086 | return; |
| 1087 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1088 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | /* |
| 1091 | * set the RA_RECV flag in the interface |
| 1092 | */ |
| 1093 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1094 | in6_dev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | if (in6_dev == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1096 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
| 1097 | skb->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | return; |
| 1099 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
| 1101 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1102 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | return; |
| 1104 | } |
| 1105 | |
Shmulik Ladkani | aeaf6e9 | 2012-11-30 10:25:59 +0000 | [diff] [blame] | 1106 | if (!ipv6_accept_ra(in6_dev)) |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1107 | goto skip_linkparms; |
| 1108 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1109 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1110 | /* skip link-specific parameters from interior routers */ |
| 1111 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) |
| 1112 | goto skip_linkparms; |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1113 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | if (in6_dev->if_flags & IF_RS_SENT) { |
| 1116 | /* |
| 1117 | * flag that an RA was received after an RS was sent |
| 1118 | * out on this interface. |
| 1119 | */ |
| 1120 | in6_dev->if_flags |= IF_RA_RCVD; |
| 1121 | } |
| 1122 | |
| 1123 | /* |
| 1124 | * Remember the managed/otherconf flags from most recently |
| 1125 | * received RA message (RFC 2462) -- yoshfuji |
| 1126 | */ |
| 1127 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
| 1128 | IF_RA_OTHERCONF)) | |
| 1129 | (ra_msg->icmph.icmp6_addrconf_managed ? |
| 1130 | IF_RA_MANAGED : 0) | |
| 1131 | (ra_msg->icmph.icmp6_addrconf_other ? |
| 1132 | IF_RA_OTHERCONF : 0); |
| 1133 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1134 | if (!in6_dev->cnf.accept_ra_defrtr) |
| 1135 | goto skip_defrtr; |
| 1136 | |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1137 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
| 1138 | goto skip_defrtr; |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
| 1141 | |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1142 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 1143 | pref = ra_msg->icmph.icmp6_router_pref; |
| 1144 | /* 10b is handled as if it were 00b (medium) */ |
YOSHIFUJI Hideaki | 930d6ff | 2006-03-20 17:05:30 -0800 | [diff] [blame] | 1145 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
YOSHIFUJI Hideaki | 6d5b78c | 2007-06-22 16:07:04 -0700 | [diff] [blame] | 1146 | !in6_dev->cnf.accept_ra_rtr_pref) |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1147 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
| 1148 | #endif |
| 1149 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1150 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1152 | if (rt) { |
| 1153 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
| 1154 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1155 | ND_PRINTK(0, err, |
| 1156 | "RA: %s got default router without neighbour\n", |
| 1157 | __func__); |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 1158 | ip6_rt_put(rt); |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1159 | return; |
| 1160 | } |
| 1161 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | if (rt && lifetime == 0) { |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1163 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | rt = NULL; |
| 1165 | } |
| 1166 | |
| 1167 | if (rt == NULL && lifetime) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1168 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1170 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | if (rt == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1172 | ND_PRINTK(0, err, |
| 1173 | "RA: %s failed to add default route\n", |
| 1174 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | return; |
| 1176 | } |
| 1177 | |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1178 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | if (neigh == NULL) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1180 | ND_PRINTK(0, err, |
| 1181 | "RA: %s got default router without neighbour\n", |
| 1182 | __func__); |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 1183 | ip6_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | return; |
| 1185 | } |
| 1186 | neigh->flags |= NTF_ROUTER; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1187 | } else if (rt) { |
Pedro Ribeiro | 22441cf | 2008-10-15 15:47:49 -0700 | [diff] [blame] | 1188 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | } |
| 1190 | |
| 1191 | if (rt) |
Gao feng | 1716a96 | 2012-04-06 00:13:10 +0000 | [diff] [blame] | 1192 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | if (ra_msg->icmph.icmp6_hop_limit) { |
| 1194 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
| 1195 | if (rt) |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1196 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
| 1197 | ra_msg->icmph.icmp6_hop_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | } |
| 1199 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1200 | skip_defrtr: |
| 1201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | /* |
| 1203 | * Update Reachable Time and Retrans Timer |
| 1204 | */ |
| 1205 | |
| 1206 | if (in6_dev->nd_parms) { |
| 1207 | unsigned long rtime = ntohl(ra_msg->retrans_timer); |
| 1208 | |
| 1209 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { |
| 1210 | rtime = (rtime*HZ)/1000; |
| 1211 | if (rtime < HZ/10) |
| 1212 | rtime = HZ/10; |
| 1213 | in6_dev->nd_parms->retrans_time = rtime; |
| 1214 | in6_dev->tstamp = jiffies; |
| 1215 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1216 | } |
| 1217 | |
| 1218 | rtime = ntohl(ra_msg->reachable_time); |
| 1219 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { |
| 1220 | rtime = (rtime*HZ)/1000; |
| 1221 | |
| 1222 | if (rtime < HZ/10) |
| 1223 | rtime = HZ/10; |
| 1224 | |
| 1225 | if (rtime != in6_dev->nd_parms->base_reachable_time) { |
| 1226 | in6_dev->nd_parms->base_reachable_time = rtime; |
| 1227 | in6_dev->nd_parms->gc_staletime = 3 * rtime; |
| 1228 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
| 1229 | in6_dev->tstamp = jiffies; |
| 1230 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1231 | } |
| 1232 | } |
| 1233 | } |
| 1234 | |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1235 | skip_linkparms: |
| 1236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | /* |
| 1238 | * Process options. |
| 1239 | */ |
| 1240 | |
| 1241 | if (!neigh) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1242 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | skb->dev, 1); |
| 1244 | if (neigh) { |
| 1245 | u8 *lladdr = NULL; |
| 1246 | if (ndopts.nd_opts_src_lladdr) { |
| 1247 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 1248 | skb->dev); |
| 1249 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1250 | ND_PRINTK(2, warn, |
| 1251 | "RA: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | goto out; |
| 1253 | } |
| 1254 | } |
| 1255 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1256 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1257 | NEIGH_UPDATE_F_OVERRIDE| |
| 1258 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1259 | NEIGH_UPDATE_F_ISROUTER); |
| 1260 | } |
| 1261 | |
Shmulik Ladkani | aeaf6e9 | 2012-11-30 10:25:59 +0000 | [diff] [blame] | 1262 | if (!ipv6_accept_ra(in6_dev)) |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1263 | goto out; |
| 1264 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1265 | #ifdef CONFIG_IPV6_ROUTE_INFO |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1266 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
| 1267 | goto skip_routeinfo; |
| 1268 | |
YOSHIFUJI Hideaki | 09c884d | 2006-03-20 17:07:03 -0800 | [diff] [blame] | 1269 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1270 | struct nd_opt_hdr *p; |
| 1271 | for (p = ndopts.nd_opts_ri; |
| 1272 | p; |
| 1273 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { |
YOSHIFUJI Hideaki | 6294e00 | 2008-03-15 23:56:52 -0400 | [diff] [blame] | 1274 | struct route_info *ri = (struct route_info *)p; |
| 1275 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
| 1276 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && |
| 1277 | ri->prefix_len == 0) |
| 1278 | continue; |
| 1279 | #endif |
| 1280 | 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] | 1281 | continue; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1282 | 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] | 1283 | &ipv6_hdr(skb)->saddr); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1284 | } |
| 1285 | } |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1286 | |
| 1287 | skip_routeinfo: |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1288 | #endif |
| 1289 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1290 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1291 | /* skip link-specific ndopts from interior routers */ |
| 1292 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) |
| 1293 | goto out; |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1294 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1295 | |
YOSHIFUJI Hideaki | c4fd30e | 2006-03-20 16:55:26 -0800 | [diff] [blame] | 1296 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | struct nd_opt_hdr *p; |
| 1298 | for (p = ndopts.nd_opts_pi; |
| 1299 | p; |
| 1300 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { |
Neil Horman | e6bff99 | 2012-01-04 10:49:15 +0000 | [diff] [blame] | 1301 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
| 1302 | (p->nd_opt_len) << 3, |
| 1303 | ndopts.nd_opts_src_lladdr != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | if (ndopts.nd_opts_mtu) { |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1308 | __be32 n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | u32 mtu; |
| 1310 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1311 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
| 1312 | mtu = ntohl(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | |
| 1314 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1315 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | } else if (in6_dev->cnf.mtu6 != mtu) { |
| 1317 | in6_dev->cnf.mtu6 = mtu; |
| 1318 | |
| 1319 | if (rt) |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1320 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
| 1322 | rt6_mtu_change(skb->dev, mtu); |
| 1323 | } |
| 1324 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1325 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1326 | if (ndopts.nd_useropts) { |
YOSHIFUJI Hideaki | 61cf46ad | 2008-01-22 17:32:53 +0900 | [diff] [blame] | 1327 | struct nd_opt_hdr *p; |
| 1328 | for (p = ndopts.nd_useropts; |
| 1329 | p; |
| 1330 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { |
| 1331 | ndisc_ra_useropt(skb, p); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1332 | } |
| 1333 | } |
| 1334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1336 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | } |
| 1338 | out: |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 1339 | ip6_rt_put(rt); |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1340 | if (neigh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | } |
| 1343 | |
| 1344 | static void ndisc_redirect_rcv(struct sk_buff *skb) |
| 1345 | { |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1346 | u8 *hdr; |
| 1347 | struct ndisc_options ndopts; |
| 1348 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 1349 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1350 | offsetof(struct rd_msg, opt)); |
| 1351 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1352 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1353 | switch (skb->ndisc_nodetype) { |
| 1354 | case NDISC_NODETYPE_HOST: |
| 1355 | case NDISC_NODETYPE_NODEFAULT: |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1356 | ND_PRINTK(2, warn, |
| 1357 | "Redirect: from host or unauthorized router\n"); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1358 | return; |
| 1359 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1360 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1361 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1362 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1363 | ND_PRINTK(2, warn, |
| 1364 | "Redirect: source address is not link-local\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | return; |
| 1366 | } |
| 1367 | |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1368 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
| 1369 | return; |
| 1370 | |
Duan Jiong | c92a59e | 2013-08-22 12:07:35 +0800 | [diff] [blame] | 1371 | if (!ndopts.nd_opts_rh) { |
Duan Jiong | b55b76b | 2013-09-04 19:44:21 +0800 | [diff] [blame] | 1372 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
| 1373 | skb->dev->ifindex, 0); |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1374 | return; |
Duan Jiong | c92a59e | 2013-08-22 12:07:35 +0800 | [diff] [blame] | 1375 | } |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1376 | |
| 1377 | hdr = (u8 *)ndopts.nd_opts_rh; |
| 1378 | hdr += 8; |
| 1379 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) |
| 1380 | return; |
| 1381 | |
David S. Miller | b94f1c0 | 2012-07-12 00:33:37 -0700 | [diff] [blame] | 1382 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | } |
| 1384 | |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 1385 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
| 1386 | struct sk_buff *orig_skb, |
| 1387 | int rd_len) |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1388 | { |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 1389 | u8 *opt = skb_put(skb, rd_len); |
| 1390 | |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1391 | memset(opt, 0, 8); |
| 1392 | *(opt++) = ND_OPT_REDIRECT_HDR; |
| 1393 | *(opt++) = (rd_len >> 3); |
| 1394 | opt += 6; |
| 1395 | |
| 1396 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1397 | } |
| 1398 | |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1399 | 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] | 1400 | { |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1401 | struct net_device *dev = skb->dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1402 | struct net *net = dev_net(dev); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1403 | struct sock *sk = net->ipv6.ndisc_sk; |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1404 | int optlen = 0; |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 1405 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | struct sk_buff *buff; |
YOSHIFUJI Hideaki / 吉藤英明 | 71bcdba | 2013-01-05 16:34:51 +0000 | [diff] [blame] | 1407 | struct rd_msg *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | struct in6_addr saddr_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | struct rt6_info *rt; |
| 1410 | struct dst_entry *dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1411 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | int rd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 1414 | bool ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 1416 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1417 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
| 1418 | dev->name); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1419 | return; |
| 1420 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1422 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
Brian Haley | bf0b48d | 2007-10-08 00:12:05 -0700 | [diff] [blame] | 1423 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1424 | ND_PRINTK(2, warn, |
| 1425 | "Redirect: target address is not link-local unicast\n"); |
Li Yewang | 2955652 | 2007-01-30 14:33:20 -0800 | [diff] [blame] | 1426 | return; |
| 1427 | } |
| 1428 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1429 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
YOSHIFUJI Hideaki | 95e41e9 | 2007-12-06 15:43:30 -0800 | [diff] [blame] | 1430 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1432 | dst = ip6_route_output(net, NULL, &fl6); |
RongQing.Li | 5095d64 | 2012-02-21 22:10:49 +0000 | [diff] [blame] | 1433 | if (dst->error) { |
| 1434 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | return; |
RongQing.Li | 5095d64 | 2012-02-21 22:10:49 +0000 | [diff] [blame] | 1436 | } |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1437 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 1438 | if (IS_ERR(dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | rt = (struct rt6_info *) dst; |
| 1442 | |
| 1443 | if (rt->rt6i_flags & RTF_GATEWAY) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1444 | ND_PRINTK(2, warn, |
| 1445 | "Redirect: destination is not a neighbour\n"); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1446 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | } |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 1448 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
| 1449 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
| 1450 | if (peer) |
| 1451 | inet_putpeer(peer); |
| 1452 | if (!ret) |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1453 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
| 1455 | if (dev->addr_len) { |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1456 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
| 1457 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1458 | ND_PRINTK(2, warn, |
| 1459 | "Redirect: no neigh for target address\n"); |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1460 | goto release; |
| 1461 | } |
| 1462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | read_lock_bh(&neigh->lock); |
| 1464 | if (neigh->nud_state & NUD_VALID) { |
| 1465 | memcpy(ha_buf, neigh->ha, dev->addr_len); |
| 1466 | read_unlock_bh(&neigh->lock); |
| 1467 | ha = ha_buf; |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1468 | optlen += ndisc_opt_addr_space(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | } else |
| 1470 | read_unlock_bh(&neigh->lock); |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1471 | |
| 1472 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | rd_len = min_t(unsigned int, |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1476 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
| 1477 | skb->len + 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | rd_len &= ~0x7; |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1479 | optlen += rd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1481 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 1482 | if (!buff) |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1483 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | |
YOSHIFUJI Hideaki / 吉藤英明 | 4d5c152 | 2013-01-21 06:49:25 +0000 | [diff] [blame] | 1485 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
| 1486 | *msg = (struct rd_msg) { |
| 1487 | .icmph = { |
| 1488 | .icmp6_type = NDISC_REDIRECT, |
| 1489 | }, |
| 1490 | .target = *target, |
| 1491 | .dest = ipv6_hdr(skb)->daddr, |
| 1492 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | /* |
| 1495 | * include target_address option |
| 1496 | */ |
| 1497 | |
| 1498 | if (ha) |
Matthias Schiffer | 33be081 | 2013-05-31 03:27:55 +0200 | [diff] [blame] | 1499 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | |
| 1501 | /* |
| 1502 | * build redirect option and copy skb over to the new packet. |
| 1503 | */ |
| 1504 | |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1505 | if (rd_len) |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 1506 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1508 | skb_dst_set(buff, dst); |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 1509 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1510 | return; |
| 1511 | |
| 1512 | release: |
| 1513 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | } |
| 1515 | |
| 1516 | static void pndisc_redo(struct sk_buff *skb) |
| 1517 | { |
YOSHIFUJI Hideaki | 140e26fc | 2005-10-05 12:11:41 -0700 | [diff] [blame] | 1518 | ndisc_recv_ns(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | kfree_skb(skb); |
| 1520 | } |
| 1521 | |
Hannes Frederic Sowa | b800c3b | 2013-08-27 01:36:51 +0200 | [diff] [blame] | 1522 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
| 1523 | { |
| 1524 | struct inet6_dev *idev = __in6_dev_get(skb->dev); |
| 1525 | |
| 1526 | if (!idev) |
| 1527 | return true; |
| 1528 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && |
| 1529 | idev->cnf.suppress_frag_ndisc) { |
| 1530 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); |
| 1531 | return true; |
| 1532 | } |
| 1533 | return false; |
| 1534 | } |
| 1535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | int ndisc_rcv(struct sk_buff *skb) |
| 1537 | { |
| 1538 | struct nd_msg *msg; |
| 1539 | |
Hannes Frederic Sowa | b800c3b | 2013-08-27 01:36:51 +0200 | [diff] [blame] | 1540 | if (ndisc_suppress_frag_ndisc(skb)) |
| 1541 | return 0; |
| 1542 | |
YOSHIFUJI Hideaki / 吉藤英明 | 6bce6b4 | 2013-01-21 06:48:03 +0000 | [diff] [blame] | 1543 | if (skb_linearize(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | return 0; |
| 1545 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1546 | msg = (struct nd_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1548 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1550 | if (ipv6_hdr(skb)->hop_limit != 255) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1551 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
| 1552 | ipv6_hdr(skb)->hop_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | return 0; |
| 1554 | } |
| 1555 | |
| 1556 | if (msg->icmph.icmp6_code != 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1557 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
| 1558 | msg->icmph.icmp6_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | return 0; |
| 1560 | } |
| 1561 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1562 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
| 1563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | switch (msg->icmph.icmp6_type) { |
| 1565 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 1566 | ndisc_recv_ns(skb); |
| 1567 | break; |
| 1568 | |
| 1569 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 1570 | ndisc_recv_na(skb); |
| 1571 | break; |
| 1572 | |
| 1573 | case NDISC_ROUTER_SOLICITATION: |
| 1574 | ndisc_recv_rs(skb); |
| 1575 | break; |
| 1576 | |
| 1577 | case NDISC_ROUTER_ADVERTISEMENT: |
| 1578 | ndisc_router_discovery(skb); |
| 1579 | break; |
| 1580 | |
| 1581 | case NDISC_REDIRECT: |
| 1582 | ndisc_redirect_rcv(skb); |
| 1583 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1584 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
| 1586 | return 0; |
| 1587 | } |
| 1588 | |
| 1589 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1590 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1591 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1592 | struct net *net = dev_net(dev); |
Hannes Frederic Sowa | 5cb0443 | 2012-11-06 16:46:20 +0000 | [diff] [blame] | 1593 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | |
| 1595 | switch (event) { |
| 1596 | case NETDEV_CHANGEADDR: |
| 1597 | neigh_changeaddr(&nd_tbl, dev); |
Michal Kubeček | 2ac3ac8 | 2013-08-01 10:04:14 +0200 | [diff] [blame] | 1598 | fib6_run_gc(0, net, false); |
Hannes Frederic Sowa | 5cb0443 | 2012-11-06 16:46:20 +0000 | [diff] [blame] | 1599 | idev = in6_dev_get(dev); |
| 1600 | if (!idev) |
| 1601 | break; |
| 1602 | if (idev->cnf.ndisc_notify) |
| 1603 | ndisc_send_unsol_na(dev); |
| 1604 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | break; |
| 1606 | case NETDEV_DOWN: |
| 1607 | neigh_ifdown(&nd_tbl, dev); |
Michal Kubeček | 2ac3ac8 | 2013-08-01 10:04:14 +0200 | [diff] [blame] | 1608 | fib6_run_gc(0, net, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | break; |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 1610 | case NETDEV_NOTIFY_PEERS: |
| 1611 | ndisc_send_unsol_na(dev); |
| 1612 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | default: |
| 1614 | break; |
| 1615 | } |
| 1616 | |
| 1617 | return NOTIFY_DONE; |
| 1618 | } |
| 1619 | |
| 1620 | static struct notifier_block ndisc_netdev_notifier = { |
| 1621 | .notifier_call = ndisc_netdev_event, |
| 1622 | }; |
| 1623 | |
| 1624 | #ifdef CONFIG_SYSCTL |
| 1625 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, |
| 1626 | const char *func, const char *dev_name) |
| 1627 | { |
| 1628 | static char warncomm[TASK_COMM_LEN]; |
| 1629 | static int warned; |
| 1630 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 1631 | strcpy(warncomm, current->comm); |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 1632 | 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] | 1633 | warncomm, func, |
| 1634 | dev_name, ctl->procname, |
| 1635 | dev_name, ctl->procname); |
| 1636 | warned++; |
| 1637 | } |
| 1638 | } |
| 1639 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1640 | 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] | 1641 | { |
| 1642 | struct net_device *dev = ctl->extra1; |
| 1643 | struct inet6_dev *idev; |
| 1644 | int ret; |
| 1645 | |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1646 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
| 1647 | (strcmp(ctl->procname, "base_reachable_time") == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
| 1649 | |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1650 | if (strcmp(ctl->procname, "retrans_time") == 0) |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1651 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1652 | |
| 1653 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | ret = proc_dointvec_jiffies(ctl, write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1655 | buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1656 | |
| 1657 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || |
YOSHIFUJI Hideaki | ad02ac1 | 2007-10-29 01:32:23 -0700 | [diff] [blame] | 1658 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | ret = proc_dointvec_ms_jiffies(ctl, write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1660 | buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1661 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | ret = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | |
| 1664 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1665 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
| 1667 | idev->tstamp = jiffies; |
| 1668 | inet6_ifinfo_notify(RTM_NEWLINK, idev); |
| 1669 | in6_dev_put(idev); |
| 1670 | } |
| 1671 | return ret; |
| 1672 | } |
| 1673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
| 1675 | #endif |
| 1676 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1677 | static int __net_init ndisc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | { |
| 1679 | struct ipv6_pinfo *np; |
| 1680 | struct sock *sk; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1681 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1683 | err = inet_ctl_sock_create(&sk, PF_INET6, |
| 1684 | SOCK_RAW, IPPROTO_ICMPV6, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | if (err < 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1686 | ND_PRINTK(0, err, |
| 1687 | "NDISC: Failed to initialize the control socket (err %d)\n", |
| 1688 | err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | return err; |
| 1690 | } |
| 1691 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1692 | net->ipv6.ndisc_sk = sk; |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | np->hop_limit = 255; |
| 1696 | /* Do not loopback ndisc messages */ |
| 1697 | np->mc_loop = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1699 | return 0; |
| 1700 | } |
| 1701 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1702 | static void __net_exit ndisc_net_exit(struct net *net) |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1703 | { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1704 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1705 | } |
| 1706 | |
| 1707 | static struct pernet_operations ndisc_net_ops = { |
| 1708 | .init = ndisc_net_init, |
| 1709 | .exit = ndisc_net_exit, |
| 1710 | }; |
| 1711 | |
| 1712 | int __init ndisc_init(void) |
| 1713 | { |
| 1714 | int err; |
| 1715 | |
| 1716 | err = register_pernet_subsys(&ndisc_net_ops); |
| 1717 | if (err) |
| 1718 | return err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1719 | /* |
| 1720 | * Initialize the neighbour table |
| 1721 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | neigh_table_init(&nd_tbl); |
| 1723 | |
| 1724 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 54716e3 | 2010-02-14 03:27:03 +0000 | [diff] [blame] | 1725 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 1726 | &ndisc_ifinfo_sysctl_change); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1727 | if (err) |
| 1728 | goto out_unregister_pernet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | #endif |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1730 | out: |
| 1731 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1733 | #ifdef CONFIG_SYSCTL |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1734 | out_unregister_pernet: |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1735 | unregister_pernet_subsys(&ndisc_net_ops); |
| 1736 | goto out; |
Michal Kubeček | 2c861cc | 2013-09-09 21:45:04 +0200 | [diff] [blame] | 1737 | #endif |
| 1738 | } |
| 1739 | |
| 1740 | int __init ndisc_late_init(void) |
| 1741 | { |
| 1742 | return register_netdevice_notifier(&ndisc_netdev_notifier); |
| 1743 | } |
| 1744 | |
| 1745 | void ndisc_late_cleanup(void) |
| 1746 | { |
| 1747 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | } |
| 1749 | |
| 1750 | void ndisc_cleanup(void) |
| 1751 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | #ifdef CONFIG_SYSCTL |
| 1753 | neigh_sysctl_unregister(&nd_tbl.parms); |
| 1754 | #endif |
| 1755 | neigh_table_clear(&nd_tbl); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1756 | unregister_pernet_subsys(&ndisc_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | } |