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); |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 87 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | static int ndisc_constructor(struct neighbour *neigh); |
| 89 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); |
| 90 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); |
| 91 | static int pndisc_constructor(struct pneigh_entry *n); |
| 92 | static void pndisc_destructor(struct pneigh_entry *n); |
| 93 | static void pndisc_redo(struct sk_buff *skb); |
| 94 | |
Stephen Hemminger | 89d69d2 | 2009-09-01 11:13:19 +0000 | [diff] [blame] | 95 | static const struct neigh_ops ndisc_generic_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | .family = AF_INET6, |
| 97 | .solicit = ndisc_solicit, |
| 98 | .error_report = ndisc_error_report, |
| 99 | .output = neigh_resolve_output, |
| 100 | .connected_output = neigh_connected_output, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | }; |
| 102 | |
Stephen Hemminger | 89d69d2 | 2009-09-01 11:13:19 +0000 | [diff] [blame] | 103 | static const struct neigh_ops ndisc_hh_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | .family = AF_INET6, |
| 105 | .solicit = ndisc_solicit, |
| 106 | .error_report = ndisc_error_report, |
| 107 | .output = neigh_resolve_output, |
| 108 | .connected_output = neigh_resolve_output, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | }; |
| 110 | |
| 111 | |
Stephen Hemminger | 89d69d2 | 2009-09-01 11:13:19 +0000 | [diff] [blame] | 112 | static const struct neigh_ops ndisc_direct_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | .family = AF_INET6, |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 114 | .output = neigh_direct_output, |
| 115 | .connected_output = neigh_direct_output, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | }; |
| 117 | |
| 118 | struct neigh_table nd_tbl = { |
| 119 | .family = AF_INET6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | .key_len = sizeof(struct in6_addr), |
Eric W. Biederman | bdf53c5 | 2015-03-02 00:13:22 -0600 | [diff] [blame] | 121 | .protocol = cpu_to_be16(ETH_P_IPV6), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | .hash = ndisc_hash, |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 123 | .key_eq = ndisc_key_eq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | .constructor = ndisc_constructor, |
| 125 | .pconstructor = pndisc_constructor, |
| 126 | .pdestructor = pndisc_destructor, |
| 127 | .proxy_redo = pndisc_redo, |
| 128 | .id = "ndisc_cache", |
| 129 | .parms = { |
Shan Wei | b672083 | 2010-12-01 18:05:12 +0000 | [diff] [blame] | 130 | .tbl = &nd_tbl, |
Shan Wei | b672083 | 2010-12-01 18:05:12 +0000 | [diff] [blame] | 131 | .reachable_time = ND_REACHABLE_TIME, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 132 | .data = { |
| 133 | [NEIGH_VAR_MCAST_PROBES] = 3, |
| 134 | [NEIGH_VAR_UCAST_PROBES] = 3, |
| 135 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, |
| 136 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, |
| 137 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, |
| 138 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, |
| 139 | [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, |
| 140 | [NEIGH_VAR_PROXY_QLEN] = 64, |
| 141 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, |
| 142 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, |
| 143 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | }, |
| 145 | .gc_interval = 30 * HZ, |
| 146 | .gc_thresh1 = 128, |
| 147 | .gc_thresh2 = 512, |
| 148 | .gc_thresh3 = 1024, |
| 149 | }; |
| 150 | |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 151 | 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] | 152 | { |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 153 | int pad = ndisc_addr_option_pad(skb->dev->type); |
| 154 | int data_len = skb->dev->addr_len; |
| 155 | int space = ndisc_opt_addr_space(skb->dev); |
| 156 | u8 *opt = skb_put(skb, space); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | opt[0] = type; |
| 159 | opt[1] = space>>3; |
| 160 | |
| 161 | memset(opt + 2, 0, pad); |
| 162 | opt += pad; |
| 163 | space -= pad; |
| 164 | |
| 165 | memcpy(opt+2, data, data_len); |
| 166 | data_len += 2; |
| 167 | opt += data_len; |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 168 | space -= data_len; |
| 169 | if (space > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | memset(opt, 0, space); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
| 174 | struct nd_opt_hdr *end) |
| 175 | { |
| 176 | int type; |
| 177 | if (!cur || !end || cur >= end) |
| 178 | return NULL; |
| 179 | type = cur->nd_opt_type; |
| 180 | do { |
| 181 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 182 | } while (cur < end && cur->nd_opt_type != type); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 183 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 186 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
| 187 | { |
Alexey I. Froloff | e35f30c | 2012-04-06 05:50:58 +0000 | [diff] [blame] | 188 | return opt->nd_opt_type == ND_OPT_RDNSS || |
| 189 | opt->nd_opt_type == ND_OPT_DNSSL; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, |
| 193 | struct nd_opt_hdr *end) |
| 194 | { |
| 195 | if (!cur || !end || cur >= end) |
| 196 | return NULL; |
| 197 | do { |
| 198 | cur = ((void *)cur) + (cur->nd_opt_len << 3); |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 199 | } while (cur < end && !ndisc_is_useropt(cur)); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 200 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 201 | } |
| 202 | |
David S. Miller | 30f2a5f | 2012-07-11 23:26:46 -0700 | [diff] [blame] | 203 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
| 204 | struct ndisc_options *ndopts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | { |
| 206 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; |
| 207 | |
| 208 | if (!nd_opt || opt_len < 0 || !ndopts) |
| 209 | return NULL; |
| 210 | memset(ndopts, 0, sizeof(*ndopts)); |
| 211 | while (opt_len) { |
| 212 | int l; |
| 213 | if (opt_len < sizeof(struct nd_opt_hdr)) |
| 214 | return NULL; |
| 215 | l = nd_opt->nd_opt_len << 3; |
| 216 | if (opt_len < l || l == 0) |
| 217 | return NULL; |
| 218 | switch (nd_opt->nd_opt_type) { |
| 219 | case ND_OPT_SOURCE_LL_ADDR: |
| 220 | case ND_OPT_TARGET_LL_ADDR: |
| 221 | case ND_OPT_MTU: |
| 222 | case ND_OPT_REDIRECT_HDR: |
| 223 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 224 | ND_PRINTK(2, warn, |
| 225 | "%s: duplicated ND6 option found: type=%d\n", |
| 226 | __func__, nd_opt->nd_opt_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } else { |
| 228 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 229 | } |
| 230 | break; |
| 231 | case ND_OPT_PREFIX_INFO: |
| 232 | ndopts->nd_opts_pi_end = nd_opt; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 233 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
| 235 | break; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 236 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 237 | case ND_OPT_ROUTE_INFO: |
| 238 | ndopts->nd_opts_ri_end = nd_opt; |
| 239 | if (!ndopts->nd_opts_ri) |
| 240 | ndopts->nd_opts_ri = nd_opt; |
| 241 | break; |
| 242 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | default: |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 244 | if (ndisc_is_useropt(nd_opt)) { |
| 245 | ndopts->nd_useropts_end = nd_opt; |
| 246 | if (!ndopts->nd_useropts) |
| 247 | ndopts->nd_useropts = nd_opt; |
| 248 | } else { |
| 249 | /* |
| 250 | * Unknown options must be silently ignored, |
| 251 | * to accommodate future extension to the |
| 252 | * protocol. |
| 253 | */ |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 254 | ND_PRINTK(2, notice, |
| 255 | "%s: ignored unsupported option; type=%d, len=%d\n", |
| 256 | __func__, |
| 257 | nd_opt->nd_opt_type, |
| 258 | nd_opt->nd_opt_len); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | opt_len -= l; |
| 262 | nd_opt = ((void *)nd_opt) + l; |
| 263 | } |
| 264 | return ndopts; |
| 265 | } |
| 266 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 267 | 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] | 268 | { |
| 269 | switch (dev->type) { |
| 270 | case ARPHRD_ETHER: |
| 271 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ |
| 272 | case ARPHRD_FDDI: |
| 273 | ipv6_eth_mc_map(addr, buf); |
| 274 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | case ARPHRD_ARCNET: |
| 276 | ipv6_arcnet_mc_map(addr, buf); |
| 277 | return 0; |
| 278 | case ARPHRD_INFINIBAND: |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 279 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | return 0; |
Timo Teräs | 93ca3bb | 2011-03-28 22:40:53 +0000 | [diff] [blame] | 281 | case ARPHRD_IPGRE: |
| 282 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | default: |
| 284 | if (dir) { |
| 285 | memcpy(buf, dev->broadcast, dev->addr_len); |
| 286 | return 0; |
| 287 | } |
| 288 | } |
| 289 | return -EINVAL; |
| 290 | } |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 291 | EXPORT_SYMBOL(ndisc_mc_map); |
| 292 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 293 | static u32 ndisc_hash(const void *pkey, |
| 294 | const struct net_device *dev, |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 295 | __u32 *hash_rnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 297 | return ndisc_hashfn(pkey, dev, hash_rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 300 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
| 301 | { |
| 302 | return neigh_key_eq128(n, pkey); |
| 303 | } |
| 304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | static int ndisc_constructor(struct neighbour *neigh) |
| 306 | { |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 307 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | struct net_device *dev = neigh->dev; |
| 309 | struct inet6_dev *in6_dev; |
| 310 | struct neigh_parms *parms; |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 311 | bool is_multicast = ipv6_addr_is_multicast(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | in6_dev = in6_dev_get(dev); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 314 | if (!in6_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | return -EINVAL; |
| 316 | } |
| 317 | |
| 318 | parms = in6_dev->nd_parms; |
| 319 | __neigh_parms_put(neigh->parms); |
| 320 | neigh->parms = neigh_parms_clone(parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 323 | if (!dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | neigh->nud_state = NUD_NOARP; |
| 325 | neigh->ops = &ndisc_direct_ops; |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 326 | neigh->output = neigh_direct_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } else { |
| 328 | if (is_multicast) { |
| 329 | neigh->nud_state = NUD_NOARP; |
| 330 | ndisc_mc_map(addr, neigh->ha, dev, 1); |
| 331 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { |
| 332 | neigh->nud_state = NUD_NOARP; |
| 333 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); |
| 334 | if (dev->flags&IFF_LOOPBACK) |
| 335 | neigh->type = RTN_LOCAL; |
| 336 | } else if (dev->flags&IFF_POINTOPOINT) { |
| 337 | neigh->nud_state = NUD_NOARP; |
| 338 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); |
| 339 | } |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 340 | if (dev->header_ops->cache) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | neigh->ops = &ndisc_hh_ops; |
| 342 | else |
| 343 | neigh->ops = &ndisc_generic_ops; |
| 344 | if (neigh->nud_state&NUD_VALID) |
| 345 | neigh->output = neigh->ops->connected_output; |
| 346 | else |
| 347 | neigh->output = neigh->ops->output; |
| 348 | } |
| 349 | in6_dev_put(in6_dev); |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static int pndisc_constructor(struct pneigh_entry *n) |
| 354 | { |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 355 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | struct in6_addr maddr; |
| 357 | struct net_device *dev = n->dev; |
| 358 | |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 359 | if (!dev || !__in6_dev_get(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | return -EINVAL; |
| 361 | addrconf_addr_solict_mult(addr, &maddr); |
| 362 | ipv6_dev_mc_inc(dev, &maddr); |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static void pndisc_destructor(struct pneigh_entry *n) |
| 367 | { |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 368 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | struct in6_addr maddr; |
| 370 | struct net_device *dev = n->dev; |
| 371 | |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 372 | if (!dev || !__in6_dev_get(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | return; |
| 374 | addrconf_addr_solict_mult(addr, &maddr); |
| 375 | ipv6_dev_mc_dec(dev, &maddr); |
| 376 | } |
| 377 | |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 378 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
| 379 | int len) |
| 380 | { |
| 381 | int hlen = LL_RESERVED_SPACE(dev); |
| 382 | int tlen = dev->needed_tailroom; |
| 383 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; |
| 384 | struct sk_buff *skb; |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 385 | |
Thomas Graf | 25a6e6b | 2013-09-03 13:37:01 +0200 | [diff] [blame] | 386 | 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] | 387 | if (!skb) { |
Thomas Graf | 25a6e6b | 2013-09-03 13:37:01 +0200 | [diff] [blame] | 388 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
| 389 | __func__); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 390 | return NULL; |
| 391 | } |
| 392 | |
YOSHIFUJI Hideaki / 吉藤英明 | f382d03 | 2013-01-21 06:48:29 +0000 | [diff] [blame] | 393 | skb->protocol = htons(ETH_P_IPV6); |
| 394 | skb->dev = dev; |
| 395 | |
YOSHIFUJI Hideaki / 吉藤英明 | 527a150 | 2013-01-21 06:48:39 +0000 | [diff] [blame] | 396 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki / 吉藤英明 | 5135e63 | 2013-01-21 06:48:44 +0000 | [diff] [blame] | 397 | skb_reset_transport_header(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 398 | |
Thomas Graf | 25a6e6b | 2013-09-03 13:37:01 +0200 | [diff] [blame] | 399 | /* Manually assign socket ownership as we avoid calling |
| 400 | * sock_alloc_send_pskb() to bypass wmem buffer limits |
| 401 | */ |
| 402 | skb_set_owner_w(skb, sk); |
| 403 | |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 404 | return skb; |
| 405 | } |
| 406 | |
YOSHIFUJI Hideaki / 吉藤英明 | f382d03 | 2013-01-21 06:48:29 +0000 | [diff] [blame] | 407 | 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] | 408 | const struct in6_addr *saddr, |
| 409 | const struct in6_addr *daddr, |
YOSHIFUJI Hideaki / 吉藤英明 | c8d6c38 | 2013-01-21 06:48:24 +0000 | [diff] [blame] | 410 | int hop_limit, int len) |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 411 | { |
| 412 | struct ipv6hdr *hdr; |
| 413 | |
YOSHIFUJI Hideaki / 吉藤英明 | 527a150 | 2013-01-21 06:48:39 +0000 | [diff] [blame] | 414 | skb_push(skb, sizeof(*hdr)); |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 415 | skb_reset_network_header(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 416 | hdr = ipv6_hdr(skb); |
| 417 | |
| 418 | ip6_flow_hdr(hdr, 0, 0); |
| 419 | |
| 420 | hdr->payload_len = htons(len); |
YOSHIFUJI Hideaki / 吉藤英明 | c8d6c38 | 2013-01-21 06:48:24 +0000 | [diff] [blame] | 421 | hdr->nexthdr = IPPROTO_ICMPV6; |
| 422 | hdr->hop_limit = hop_limit; |
YOSHIFUJI Hideaki / 吉藤英明 | 2576f17 | 2013-01-21 06:48:19 +0000 | [diff] [blame] | 423 | |
| 424 | hdr->saddr = *saddr; |
| 425 | hdr->daddr = *daddr; |
| 426 | } |
| 427 | |
YOSHIFUJI Hideaki / 吉藤英明 | af9a997 | 2013-01-21 06:48:34 +0000 | [diff] [blame] | 428 | static void ndisc_send_skb(struct sk_buff *skb, |
YOSHIFUJI Hideaki | fd0ea7d | 2012-12-13 02:40:26 +0900 | [diff] [blame] | 429 | const struct in6_addr *daddr, |
YOSHIFUJI Hideaki / 吉藤英明 | aa4bdd4 | 2013-01-21 06:48:58 +0000 | [diff] [blame] | 430 | const struct in6_addr *saddr) |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 431 | { |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 432 | struct dst_entry *dst = skb_dst(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | af9a997 | 2013-01-21 06:48:34 +0000 | [diff] [blame] | 433 | struct net *net = dev_net(skb->dev); |
YOSHIFUJI Hideaki / 吉藤英明 | 7b3d9b0 | 2013-01-21 06:49:08 +0000 | [diff] [blame] | 434 | struct sock *sk = net->ipv6.ndisc_sk; |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 435 | struct inet6_dev *idev; |
| 436 | int err; |
YOSHIFUJI Hideaki / 吉藤英明 | aa4bdd4 | 2013-01-21 06:48:58 +0000 | [diff] [blame] | 437 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 438 | u8 type; |
| 439 | |
| 440 | type = icmp6h->icmp6_type; |
| 441 | |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 442 | if (!dst) { |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 443 | struct flowi6 fl6; |
Brian Haley | 305d552 | 2008-11-04 17:51:14 -0800 | [diff] [blame] | 444 | |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 445 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex); |
| 446 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
| 447 | if (IS_ERR(dst)) { |
| 448 | kfree_skb(skb); |
| 449 | return; |
| 450 | } |
| 451 | |
| 452 | skb_dst_set(skb, dst); |
| 453 | } |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 454 | |
YOSHIFUJI Hideaki / 吉藤英明 | 7b3d9b0 | 2013-01-21 06:49:08 +0000 | [diff] [blame] | 455 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
| 456 | IPPROTO_ICMPV6, |
| 457 | csum_partial(icmp6h, |
| 458 | skb->len, 0)); |
| 459 | |
| 460 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); |
| 461 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 462 | rcu_read_lock(); |
| 463 | idev = __in6_dev_get(dst->dev); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 464 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 465 | |
Eric W. Biederman | 29a26a5 | 2015-09-15 20:04:16 -0500 | [diff] [blame] | 466 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
| 467 | net, sk, skb, NULL, dst->dev, |
Eric W. Biederman | 0c4b51f | 2015-09-15 20:04:18 -0500 | [diff] [blame] | 468 | dst_output_okfn); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 469 | if (!err) { |
Denis V. Lunev | 5c5d244 | 2008-10-08 10:33:50 -0700 | [diff] [blame] | 470 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
Denis V. Lunev | a862f6a | 2008-10-08 10:33:06 -0700 | [diff] [blame] | 471 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 472 | } |
| 473 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 474 | rcu_read_unlock(); |
YOSHIFUJI Hideaki | e1ec784 | 2007-04-24 20:44:52 +0900 | [diff] [blame] | 475 | } |
| 476 | |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 477 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
Cong Wang | f564f45 | 2013-08-31 13:44:36 +0800 | [diff] [blame] | 478 | const struct in6_addr *solicited_addr, |
| 479 | bool router, bool solicited, bool override, bool inc_opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | { |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 481 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | struct in6_addr tmpaddr; |
| 483 | struct inet6_ifaddr *ifp; |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 484 | const struct in6_addr *src_addr; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 485 | struct nd_msg *msg; |
| 486 | int optlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
| 488 | /* for anycast or proxy, solicited_addr != src_addr */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 489 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 490 | if (ifp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | src_addr = solicited_addr; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 492 | if (ifp->flags & IFA_F_OPTIMISTIC) |
Daniel Baluta | f2f79cc | 2013-07-13 11:26:51 +0300 | [diff] [blame] | 493 | override = false; |
stephen hemminger | 9f88816 | 2010-06-21 11:00:13 +0000 | [diff] [blame] | 494 | inc_opt |= ifp->idev->cnf.force_tllao; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | in6_ifa_put(ifp); |
| 496 | } else { |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 497 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 498 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 499 | &tmpaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | return; |
| 501 | src_addr = &tmpaddr; |
| 502 | } |
| 503 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 504 | if (!dev->addr_len) |
| 505 | inc_opt = 0; |
| 506 | if (inc_opt) |
| 507 | optlen += ndisc_opt_addr_space(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 509 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 510 | if (!skb) |
| 511 | return; |
| 512 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 513 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
| 514 | *msg = (struct nd_msg) { |
| 515 | .icmph = { |
| 516 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, |
| 517 | .icmp6_router = router, |
| 518 | .icmp6_solicited = solicited, |
| 519 | .icmp6_override = override, |
| 520 | }, |
| 521 | .target = *solicited_addr, |
| 522 | }; |
| 523 | |
| 524 | if (inc_opt) |
| 525 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, |
| 526 | dev->dev_addr); |
| 527 | |
| 528 | |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 529 | ndisc_send_skb(skb, daddr, src_addr); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 530 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 532 | static void ndisc_send_unsol_na(struct net_device *dev) |
| 533 | { |
| 534 | struct inet6_dev *idev; |
| 535 | struct inet6_ifaddr *ifa; |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 536 | |
| 537 | idev = in6_dev_get(dev); |
| 538 | if (!idev) |
| 539 | return; |
| 540 | |
| 541 | read_lock_bh(&idev->lock); |
| 542 | list_for_each_entry(ifa, &idev->addr_list, if_list) { |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 543 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 544 | /*router=*/ !!idev->cnf.forwarding, |
| 545 | /*solicited=*/ false, /*override=*/ true, |
| 546 | /*inc_opt=*/ true); |
| 547 | } |
| 548 | read_unlock_bh(&idev->lock); |
| 549 | |
| 550 | in6_dev_put(idev); |
| 551 | } |
| 552 | |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 553 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
Jiri Benc | ab45060 | 2015-08-20 13:56:27 +0200 | [diff] [blame] | 554 | const struct in6_addr *daddr, const struct in6_addr *saddr, |
| 555 | struct sk_buff *oskb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | { |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 557 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | struct in6_addr addr_buf; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 559 | int inc_opt = dev->addr_len; |
| 560 | int optlen = 0; |
| 561 | struct nd_msg *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 563 | if (!saddr) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 564 | if (ipv6_get_lladdr(dev, &addr_buf, |
| 565 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | return; |
| 567 | saddr = &addr_buf; |
| 568 | } |
| 569 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 570 | if (ipv6_addr_any(saddr)) |
Daniel Baluta | f2f79cc | 2013-07-13 11:26:51 +0300 | [diff] [blame] | 571 | inc_opt = false; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 572 | if (inc_opt) |
| 573 | optlen += ndisc_opt_addr_space(dev); |
| 574 | |
| 575 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 576 | if (!skb) |
| 577 | return; |
| 578 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 579 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
| 580 | *msg = (struct nd_msg) { |
| 581 | .icmph = { |
| 582 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, |
| 583 | }, |
| 584 | .target = *solicit, |
| 585 | }; |
| 586 | |
| 587 | if (inc_opt) |
| 588 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, |
| 589 | dev->dev_addr); |
| 590 | |
Jiri Benc | ab45060 | 2015-08-20 13:56:27 +0200 | [diff] [blame] | 591 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE) && oskb) |
| 592 | skb_dst_copy(skb, oskb); |
| 593 | |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 594 | ndisc_send_skb(skb, daddr, saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 597 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
| 598 | const struct in6_addr *daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | { |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 600 | struct sk_buff *skb; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 601 | struct rs_msg *msg; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 602 | int send_sllao = dev->addr_len; |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 603 | int optlen = 0; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 604 | |
| 605 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 606 | /* |
| 607 | * According to section 2.2 of RFC 4429, we must not |
| 608 | * send router solicitations with a sllao from |
| 609 | * optimistic addresses, but we may send the solicitation |
| 610 | * if we don't include the sllao. So here we check |
| 611 | * if our address is optimistic, and if so, we |
Joe Perches | bea8519 | 2007-12-20 14:01:35 -0800 | [diff] [blame] | 612 | * suppress the inclusion of the sllao. |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 613 | */ |
| 614 | if (send_sllao) { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 615 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
Daniel Lezcano | 1cab3da | 2008-01-10 22:44:09 -0800 | [diff] [blame] | 616 | dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 617 | if (ifp) { |
| 618 | if (ifp->flags & IFA_F_OPTIMISTIC) { |
YOSHIFUJI Hideaki | ca04356 | 2007-02-28 23:13:20 +0900 | [diff] [blame] | 619 | send_sllao = 0; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 620 | } |
YOSHIFUJI Hideaki | ca04356 | 2007-02-28 23:13:20 +0900 | [diff] [blame] | 621 | in6_ifa_put(ifp); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 622 | } else { |
| 623 | send_sllao = 0; |
| 624 | } |
| 625 | } |
| 626 | #endif |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 627 | if (send_sllao) |
| 628 | optlen += ndisc_opt_addr_space(dev); |
| 629 | |
| 630 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 631 | if (!skb) |
| 632 | return; |
| 633 | |
YOSHIFUJI Hideaki / 吉藤英明 | 1cb3fe5 | 2013-01-21 06:49:17 +0000 | [diff] [blame] | 634 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
| 635 | *msg = (struct rs_msg) { |
| 636 | .icmph = { |
| 637 | .icmp6_type = NDISC_ROUTER_SOLICITATION, |
| 638 | }, |
| 639 | }; |
| 640 | |
| 641 | if (send_sllao) |
| 642 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, |
| 643 | dev->dev_addr); |
| 644 | |
YOSHIFUJI Hideaki / 吉藤英明 | b44b5f4 | 2013-01-21 06:49:13 +0000 | [diff] [blame] | 645 | ndisc_send_skb(skb, daddr, saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
| 649 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) |
| 650 | { |
| 651 | /* |
| 652 | * "The sender MUST return an ICMP |
| 653 | * destination unreachable" |
| 654 | */ |
| 655 | dst_link_failure(skb); |
| 656 | kfree_skb(skb); |
| 657 | } |
| 658 | |
| 659 | /* Called with locked neigh: either read or both */ |
| 660 | |
| 661 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) |
| 662 | { |
| 663 | struct in6_addr *saddr = NULL; |
| 664 | struct in6_addr mcaddr; |
| 665 | struct net_device *dev = neigh->dev; |
| 666 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; |
| 667 | int probes = atomic_read(&neigh->probes); |
| 668 | |
Erik Kline | c58da4c | 2015-02-04 20:01:23 +0900 | [diff] [blame] | 669 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
| 670 | dev, 1, |
| 671 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 672 | saddr = &ipv6_hdr(skb)->saddr; |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 673 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
| 674 | if (probes < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | if (!(neigh->nud_state & NUD_VALID)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 676 | ND_PRINTK(1, dbg, |
| 677 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", |
| 678 | __func__, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 680 | ndisc_send_ns(dev, target, target, saddr, skb); |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 681 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | neigh_app_ns(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } else { |
| 684 | addrconf_addr_solict_mult(target, &mcaddr); |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 685 | ndisc_send_ns(dev, target, &mcaddr, saddr, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | } |
| 687 | } |
| 688 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 689 | static int pndisc_is_router(const void *pkey, |
| 690 | struct net_device *dev) |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 691 | { |
| 692 | struct pneigh_entry *n; |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 693 | int ret = -1; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 694 | |
| 695 | read_lock_bh(&nd_tbl.lock); |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 696 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
| 697 | if (n) |
| 698 | ret = !!(n->flags & NTF_ROUTER); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 699 | read_unlock_bh(&nd_tbl.lock); |
| 700 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 701 | return ret; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | static void ndisc_recv_ns(struct sk_buff *skb) |
| 705 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 706 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 707 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
| 708 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | u8 *lladdr = NULL; |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 710 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 711 | offsetof(struct nd_msg, opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | struct ndisc_options ndopts; |
| 713 | struct net_device *dev = skb->dev; |
| 714 | struct inet6_ifaddr *ifp; |
| 715 | struct inet6_dev *idev = NULL; |
| 716 | struct neighbour *neigh; |
| 717 | int dad = ipv6_addr_any(saddr); |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 718 | bool inc; |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 719 | int is_router = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
YOSHIFUJI Hideaki / 吉藤英明 | 115b0aa | 2013-01-18 02:05:03 +0000 | [diff] [blame] | 721 | if (skb->len < sizeof(struct nd_msg)) { |
| 722 | ND_PRINTK(2, warn, "NS: packet too short\n"); |
| 723 | return; |
| 724 | } |
| 725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (ipv6_addr_is_multicast(&msg->target)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 727 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | return; |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * RFC2461 7.1.1: |
| 733 | * DAD has to be destined for solicited node multicast address. |
| 734 | */ |
YOSHIFUJI Hideaki / 吉藤英明 | ca97a64 | 2013-01-20 07:39:00 +0000 | [diff] [blame] | 735 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 736 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | return; |
| 738 | } |
| 739 | |
| 740 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 741 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return; |
| 743 | } |
| 744 | |
| 745 | if (ndopts.nd_opts_src_lladdr) { |
| 746 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); |
| 747 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 748 | ND_PRINTK(2, warn, |
| 749 | "NS: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return; |
| 751 | } |
| 752 | |
| 753 | /* RFC2461 7.1.1: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 754 | * If the IP source address is the unspecified address, |
| 755 | * there MUST NOT be source link-layer address option |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | * in the message. |
| 757 | */ |
| 758 | if (dad) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 759 | ND_PRINTK(2, warn, |
| 760 | "NS: bad DAD packet (link-layer address option)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | return; |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | inc = ipv6_addr_is_multicast(daddr); |
| 766 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 767 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 768 | if (ifp) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 769 | |
| 770 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
| 771 | if (dad) { |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 772 | /* |
| 773 | * We are colliding with another node |
| 774 | * who is doing DAD |
| 775 | * so fail our DAD process |
| 776 | */ |
| 777 | addrconf_dad_failure(ifp); |
Denis V. Lunev | 9e3be4b | 2007-09-11 11:04:49 +0200 | [diff] [blame] | 778 | return; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 779 | } else { |
| 780 | /* |
| 781 | * This is not a dad solicitation. |
| 782 | * If we are an optimistic node, |
| 783 | * we should respond. |
| 784 | * Otherwise, we should ignore it. |
| 785 | */ |
| 786 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) |
| 787 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | idev = ifp->idev; |
| 792 | } else { |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 793 | struct net *net = dev_net(dev); |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | idev = in6_dev_get(dev); |
| 796 | if (!idev) { |
| 797 | /* XXX: count this drop? */ |
| 798 | return; |
| 799 | } |
| 800 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 801 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 802 | (idev->cnf.forwarding && |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 803 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 804 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 805 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | skb->pkt_type != PACKET_HOST && |
Daniel Baluta | f2f79cc | 2013-07-13 11:26:51 +0300 | [diff] [blame] | 807 | inc && |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 808 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | /* |
| 810 | * for anycast or proxy, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 811 | * sender should delay its response |
| 812 | * by a random time between 0 and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | * MAX_ANYCAST_DELAY_TIME seconds. |
| 814 | * (RFC2461) -- yoshfuji |
| 815 | */ |
| 816 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); |
| 817 | if (n) |
| 818 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); |
| 819 | goto out; |
| 820 | } |
| 821 | } else |
| 822 | goto out; |
| 823 | } |
| 824 | |
YOSHIFUJI Hideaki | 0736ffc | 2008-03-28 13:37:58 +0900 | [diff] [blame] | 825 | if (is_router < 0) |
YOSHIFUJI Hideaki / 吉藤英明 | fb56863 | 2013-01-20 07:39:18 +0000 | [diff] [blame] | 826 | is_router = idev->cnf.forwarding; |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | if (dad) { |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 829 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
YOSHIFUJI Hideaki / 吉藤英明 | fb56863 | 2013-01-20 07:39:18 +0000 | [diff] [blame] | 830 | !!is_router, false, (ifp != NULL), true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | goto out; |
| 832 | } |
| 833 | |
| 834 | if (inc) |
| 835 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); |
| 836 | else |
| 837 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); |
| 838 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 839 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | * update / create cache entry |
| 841 | * for the source address |
| 842 | */ |
| 843 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, |
| 844 | !inc || lladdr || !dev->addr_len); |
| 845 | if (neigh) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 846 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 848 | NEIGH_UPDATE_F_OVERRIDE); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 849 | if (neigh || !dev->header_ops) { |
Jiri Benc | 38cf595 | 2015-09-22 18:57:13 +0200 | [diff] [blame] | 850 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
YOSHIFUJI Hideaki / 吉藤英明 | fb56863 | 2013-01-20 07:39:18 +0000 | [diff] [blame] | 851 | true, (ifp != NULL && inc), inc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | if (neigh) |
| 853 | neigh_release(neigh); |
| 854 | } |
| 855 | |
| 856 | out: |
| 857 | if (ifp) |
| 858 | in6_ifa_put(ifp); |
| 859 | else |
| 860 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | static void ndisc_recv_na(struct sk_buff *skb) |
| 864 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 865 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
Duan Jiong | be7a010 | 2014-05-15 15:56:14 +0800 | [diff] [blame] | 866 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 867 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | u8 *lladdr = NULL; |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 869 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 870 | offsetof(struct nd_msg, opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | struct ndisc_options ndopts; |
| 872 | struct net_device *dev = skb->dev; |
| 873 | struct inet6_ifaddr *ifp; |
| 874 | struct neighbour *neigh; |
| 875 | |
| 876 | if (skb->len < sizeof(struct nd_msg)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 877 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | return; |
| 879 | } |
| 880 | |
| 881 | if (ipv6_addr_is_multicast(&msg->target)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 882 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | return; |
| 884 | } |
| 885 | |
| 886 | if (ipv6_addr_is_multicast(daddr) && |
| 887 | msg->icmph.icmp6_solicited) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 888 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | return; |
| 890 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 893 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | return; |
| 895 | } |
| 896 | if (ndopts.nd_opts_tgt_lladdr) { |
| 897 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); |
| 898 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 899 | ND_PRINTK(2, warn, |
| 900 | "NA: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | return; |
| 902 | } |
| 903 | } |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 904 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 905 | if (ifp) { |
Daniel Walter | bd01592 | 2011-04-13 21:09:25 +0000 | [diff] [blame] | 906 | if (skb->pkt_type != PACKET_LOOPBACK |
| 907 | && (ifp->flags & IFA_F_TENTATIVE)) { |
| 908 | addrconf_dad_failure(ifp); |
| 909 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } |
| 911 | /* What should we make now? The advertisement |
| 912 | is invalid, but ndisc specs say nothing |
| 913 | about it. It could be misconfiguration, or |
| 914 | an smart proxy agent tries to help us :-) |
Jan Sembera | 24fc7b8 | 2008-12-09 15:48:32 -0800 | [diff] [blame] | 915 | |
| 916 | We should not print the error if NA has been |
| 917 | received from loopback - it is just our own |
| 918 | unsolicited advertisement. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | */ |
Jan Sembera | 24fc7b8 | 2008-12-09 15:48:32 -0800 | [diff] [blame] | 920 | if (skb->pkt_type != PACKET_LOOPBACK) |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 921 | ND_PRINTK(1, warn, |
| 922 | "NA: someone advertises our address %pI6 on %s!\n", |
| 923 | &ifp->addr, ifp->idev->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | in6_ifa_put(ifp); |
| 925 | return; |
| 926 | } |
| 927 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); |
| 928 | |
| 929 | if (neigh) { |
| 930 | u8 old_flags = neigh->flags; |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 931 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
| 933 | if (neigh->nud_state & NUD_FAILED) |
| 934 | goto out; |
| 935 | |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 936 | /* |
| 937 | * Don't update the neighbor cache entry on a proxy NA from |
| 938 | * ourselves because either the proxied node is off link or it |
| 939 | * has already sent a NA to us. |
| 940 | */ |
| 941 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 942 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
| 943 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { |
Nicolas Dichtel | b20b6d9 | 2012-11-07 05:05:38 +0000 | [diff] [blame] | 944 | /* XXX: idev->cnf.proxy_ndp */ |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 945 | goto out; |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 946 | } |
Ville Nuorvala | 5f3e6e9 | 2006-09-22 14:42:46 -0700 | [diff] [blame] | 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | neigh_update(neigh, lladdr, |
| 949 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
| 950 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 951 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| |
| 952 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 953 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); |
| 954 | |
| 955 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { |
| 956 | /* |
| 957 | * Change: router to host |
| 958 | */ |
Duan Jiong | be7a010 | 2014-05-15 15:56:14 +0800 | [diff] [blame] | 959 | rt6_clean_tohost(dev_net(dev), saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
| 961 | |
| 962 | out: |
| 963 | neigh_release(neigh); |
| 964 | } |
| 965 | } |
| 966 | |
| 967 | static void ndisc_recv_rs(struct sk_buff *skb) |
| 968 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 969 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
| 971 | struct neighbour *neigh; |
| 972 | struct inet6_dev *idev; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 973 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | struct ndisc_options ndopts; |
| 975 | u8 *lladdr = NULL; |
| 976 | |
| 977 | if (skb->len < sizeof(*rs_msg)) |
| 978 | return; |
| 979 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 980 | idev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | if (!idev) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 982 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | return; |
| 984 | } |
| 985 | |
| 986 | /* Don't accept RS if we're not in router mode */ |
| 987 | if (!idev->cnf.forwarding) |
| 988 | goto out; |
| 989 | |
| 990 | /* |
| 991 | * Don't update NCE if src = ::; |
| 992 | * this implies that the source node has no ip address assigned yet. |
| 993 | */ |
| 994 | if (ipv6_addr_any(saddr)) |
| 995 | goto out; |
| 996 | |
| 997 | /* Parse ND options */ |
| 998 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 999 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | goto out; |
| 1001 | } |
| 1002 | |
| 1003 | if (ndopts.nd_opts_src_lladdr) { |
| 1004 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 1005 | skb->dev); |
| 1006 | if (!lladdr) |
| 1007 | goto out; |
| 1008 | } |
| 1009 | |
| 1010 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); |
| 1011 | if (neigh) { |
| 1012 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1013 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1014 | NEIGH_UPDATE_F_OVERRIDE| |
| 1015 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); |
| 1016 | neigh_release(neigh); |
| 1017 | } |
| 1018 | out: |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1019 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | } |
| 1021 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1022 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
| 1023 | { |
| 1024 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); |
| 1025 | struct sk_buff *skb; |
| 1026 | struct nlmsghdr *nlh; |
| 1027 | struct nduseroptmsg *ndmsg; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1028 | struct net *net = dev_net(ra->dev); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1029 | int err; |
| 1030 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) |
| 1031 | + (opt->nd_opt_len << 3)); |
| 1032 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); |
| 1033 | |
| 1034 | skb = nlmsg_new(msg_size, GFP_ATOMIC); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1035 | if (!skb) { |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1036 | err = -ENOBUFS; |
| 1037 | goto errout; |
| 1038 | } |
| 1039 | |
| 1040 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1041 | if (!nlh) { |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1042 | goto nla_put_failure; |
| 1043 | } |
| 1044 | |
| 1045 | ndmsg = nlmsg_data(nlh); |
| 1046 | ndmsg->nduseropt_family = AF_INET6; |
Pierre Ynard | dbb2ed2 | 2007-11-12 17:58:35 -0800 | [diff] [blame] | 1047 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1048 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
| 1049 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; |
| 1050 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; |
| 1051 | |
| 1052 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); |
| 1053 | |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1054 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
David S. Miller | c78679e | 2012-04-01 20:27:33 -0400 | [diff] [blame] | 1055 | goto nla_put_failure; |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1056 | nlmsg_end(skb, nlh); |
| 1057 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1058 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1059 | return; |
| 1060 | |
| 1061 | nla_put_failure: |
| 1062 | nlmsg_free(skb); |
| 1063 | err = -EMSGSIZE; |
| 1064 | errout: |
Daniel Lezcano | a18bc69 | 2008-03-07 11:14:49 -0800 | [diff] [blame] | 1065 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1066 | } |
| 1067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | static void ndisc_router_discovery(struct sk_buff *skb) |
| 1069 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1070 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | struct neighbour *neigh = NULL; |
| 1072 | struct inet6_dev *in6_dev; |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1073 | struct rt6_info *rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | int lifetime; |
| 1075 | struct ndisc_options ndopts; |
| 1076 | int optlen; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1077 | unsigned int pref = 0; |
Marius Tomaschewski | a394eef | 2015-08-31 15:59:22 +0200 | [diff] [blame] | 1078 | __u32 old_if_flags; |
Marius Tomaschewski | 2053aeb | 2015-09-01 01:57:30 +0200 | [diff] [blame] | 1079 | bool send_ifinfo_notify = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 1081 | __u8 *opt = (__u8 *)(ra_msg + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 1083 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
| 1084 | sizeof(struct ra_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1086 | ND_PRINTK(2, info, |
| 1087 | "RA: %s, dev: %s\n", |
| 1088 | __func__, skb->dev->name); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1089 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1090 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | return; |
| 1092 | } |
| 1093 | if (optlen < 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1094 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | return; |
| 1096 | } |
| 1097 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1098 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1099 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1100 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1101 | return; |
| 1102 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1103 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | /* |
| 1106 | * set the RA_RECV flag in the interface |
| 1107 | */ |
| 1108 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 1109 | in6_dev = __in6_dev_get(skb->dev); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1110 | if (!in6_dev) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1111 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
| 1112 | skb->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | return; |
| 1114 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1117 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | return; |
| 1119 | } |
| 1120 | |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1121 | if (!ipv6_accept_ra(in6_dev)) { |
| 1122 | ND_PRINTK(2, info, |
| 1123 | "RA: %s, did not accept ra for dev: %s\n", |
| 1124 | __func__, skb->dev->name); |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1125 | goto skip_linkparms; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1126 | } |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1127 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1128 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1129 | /* skip link-specific parameters from interior routers */ |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1130 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
| 1131 | ND_PRINTK(2, info, |
| 1132 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", |
| 1133 | __func__, skb->dev->name); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1134 | goto skip_linkparms; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1135 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1136 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | if (in6_dev->if_flags & IF_RS_SENT) { |
| 1139 | /* |
| 1140 | * flag that an RA was received after an RS was sent |
| 1141 | * out on this interface. |
| 1142 | */ |
| 1143 | in6_dev->if_flags |= IF_RA_RCVD; |
| 1144 | } |
| 1145 | |
| 1146 | /* |
| 1147 | * Remember the managed/otherconf flags from most recently |
| 1148 | * received RA message (RFC 2462) -- yoshfuji |
| 1149 | */ |
Marius Tomaschewski | a394eef | 2015-08-31 15:59:22 +0200 | [diff] [blame] | 1150 | old_if_flags = in6_dev->if_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
| 1152 | IF_RA_OTHERCONF)) | |
| 1153 | (ra_msg->icmph.icmp6_addrconf_managed ? |
| 1154 | IF_RA_MANAGED : 0) | |
| 1155 | (ra_msg->icmph.icmp6_addrconf_other ? |
| 1156 | IF_RA_OTHERCONF : 0); |
| 1157 | |
Marius Tomaschewski | a394eef | 2015-08-31 15:59:22 +0200 | [diff] [blame] | 1158 | if (old_if_flags != in6_dev->if_flags) |
Marius Tomaschewski | 2053aeb | 2015-09-01 01:57:30 +0200 | [diff] [blame] | 1159 | send_ifinfo_notify = true; |
Marius Tomaschewski | a394eef | 2015-08-31 15:59:22 +0200 | [diff] [blame] | 1160 | |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1161 | if (!in6_dev->cnf.accept_ra_defrtr) { |
| 1162 | ND_PRINTK(2, info, |
| 1163 | "RA: %s, defrtr is false for dev: %s\n", |
| 1164 | __func__, skb->dev->name); |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1165 | goto skip_defrtr; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1166 | } |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1167 | |
Ben Greear | d933319 | 2014-06-25 14:44:53 -0700 | [diff] [blame] | 1168 | /* Do not accept RA with source-addr found on local machine unless |
| 1169 | * accept_ra_from_local is set to true. |
| 1170 | */ |
Li RongQing | b642881 | 2014-07-10 18:02:46 +0800 | [diff] [blame] | 1171 | if (!in6_dev->cnf.accept_ra_from_local && |
| 1172 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, |
| 1173 | NULL, 0)) { |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1174 | ND_PRINTK(2, info, |
Ben Greear | d933319 | 2014-06-25 14:44:53 -0700 | [diff] [blame] | 1175 | "RA from local address detected on dev: %s: default router ignored\n", |
| 1176 | skb->dev->name); |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1177 | goto skip_defrtr; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1178 | } |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
| 1181 | |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1182 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 1183 | pref = ra_msg->icmph.icmp6_router_pref; |
| 1184 | /* 10b is handled as if it were 00b (medium) */ |
YOSHIFUJI Hideaki | 930d6ff | 2006-03-20 17:05:30 -0800 | [diff] [blame] | 1185 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
YOSHIFUJI Hideaki | 6d5b78c | 2007-06-22 16:07:04 -0700 | [diff] [blame] | 1186 | !in6_dev->cnf.accept_ra_rtr_pref) |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1187 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
| 1188 | #endif |
| 1189 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1190 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1192 | if (rt) { |
| 1193 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
| 1194 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1195 | ND_PRINTK(0, err, |
| 1196 | "RA: %s got default router without neighbour\n", |
| 1197 | __func__); |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 1198 | ip6_rt_put(rt); |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1199 | return; |
| 1200 | } |
| 1201 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | if (rt && lifetime == 0) { |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1203 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | rt = NULL; |
| 1205 | } |
| 1206 | |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1207 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
| 1208 | rt, lifetime, skb->dev->name); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1209 | if (!rt && lifetime) { |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1210 | ND_PRINTK(3, info, "RA: adding default router\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1212 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1213 | if (!rt) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1214 | ND_PRINTK(0, err, |
| 1215 | "RA: %s failed to add default route\n", |
| 1216 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | return; |
| 1218 | } |
| 1219 | |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1220 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1221 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1222 | ND_PRINTK(0, err, |
| 1223 | "RA: %s got default router without neighbour\n", |
| 1224 | __func__); |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 1225 | ip6_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | return; |
| 1227 | } |
| 1228 | neigh->flags |= NTF_ROUTER; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1229 | } else if (rt) { |
Pedro Ribeiro | 22441cf | 2008-10-15 15:47:49 -0700 | [diff] [blame] | 1230 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | if (rt) |
Gao feng | 1716a96 | 2012-04-06 00:13:10 +0000 | [diff] [blame] | 1234 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
Hangbin Liu | 8013d1d | 2015-07-30 14:28:42 +0800 | [diff] [blame] | 1235 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
| 1236 | ra_msg->icmph.icmp6_hop_limit) { |
| 1237 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { |
D.S. Ljungmark | 6fd9909 | 2015-03-25 09:28:15 +0100 | [diff] [blame] | 1238 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
Hangbin Liu | 8013d1d | 2015-07-30 14:28:42 +0800 | [diff] [blame] | 1239 | if (rt) |
| 1240 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
| 1241 | ra_msg->icmph.icmp6_hop_limit); |
D.S. Ljungmark | 6fd9909 | 2015-03-25 09:28:15 +0100 | [diff] [blame] | 1242 | } else { |
Hangbin Liu | 8013d1d | 2015-07-30 14:28:42 +0800 | [diff] [blame] | 1243 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
D.S. Ljungmark | 6fd9909 | 2015-03-25 09:28:15 +0100 | [diff] [blame] | 1244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
| 1246 | |
YOSHIFUJI Hideaki | 65f5c7c | 2006-03-20 16:55:08 -0800 | [diff] [blame] | 1247 | skip_defrtr: |
| 1248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | /* |
| 1250 | * Update Reachable Time and Retrans Timer |
| 1251 | */ |
| 1252 | |
| 1253 | if (in6_dev->nd_parms) { |
| 1254 | unsigned long rtime = ntohl(ra_msg->retrans_timer); |
| 1255 | |
| 1256 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { |
| 1257 | rtime = (rtime*HZ)/1000; |
| 1258 | if (rtime < HZ/10) |
| 1259 | rtime = HZ/10; |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1260 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | in6_dev->tstamp = jiffies; |
Marius Tomaschewski | 2053aeb | 2015-09-01 01:57:30 +0200 | [diff] [blame] | 1262 | send_ifinfo_notify = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | } |
| 1264 | |
| 1265 | rtime = ntohl(ra_msg->reachable_time); |
| 1266 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { |
| 1267 | rtime = (rtime*HZ)/1000; |
| 1268 | |
| 1269 | if (rtime < HZ/10) |
| 1270 | rtime = HZ/10; |
| 1271 | |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1272 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
| 1273 | NEIGH_VAR_SET(in6_dev->nd_parms, |
| 1274 | BASE_REACHABLE_TIME, rtime); |
| 1275 | NEIGH_VAR_SET(in6_dev->nd_parms, |
| 1276 | GC_STALETIME, 3 * rtime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
| 1278 | in6_dev->tstamp = jiffies; |
Marius Tomaschewski | 2053aeb | 2015-09-01 01:57:30 +0200 | [diff] [blame] | 1279 | send_ifinfo_notify = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | } |
| 1281 | } |
| 1282 | } |
| 1283 | |
Marius Tomaschewski | 2053aeb | 2015-09-01 01:57:30 +0200 | [diff] [blame] | 1284 | /* |
| 1285 | * Send a notify if RA changed managed/otherconf flags or timer settings |
| 1286 | */ |
| 1287 | if (send_ifinfo_notify) |
| 1288 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); |
| 1289 | |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1290 | skip_linkparms: |
| 1291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | /* |
| 1293 | * Process options. |
| 1294 | */ |
| 1295 | |
| 1296 | if (!neigh) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1297 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | skb->dev, 1); |
| 1299 | if (neigh) { |
| 1300 | u8 *lladdr = NULL; |
| 1301 | if (ndopts.nd_opts_src_lladdr) { |
| 1302 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, |
| 1303 | skb->dev); |
| 1304 | if (!lladdr) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1305 | ND_PRINTK(2, warn, |
| 1306 | "RA: invalid link-layer address length\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | goto out; |
| 1308 | } |
| 1309 | } |
| 1310 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1311 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1312 | NEIGH_UPDATE_F_OVERRIDE| |
| 1313 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1314 | NEIGH_UPDATE_F_ISROUTER); |
| 1315 | } |
| 1316 | |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1317 | if (!ipv6_accept_ra(in6_dev)) { |
| 1318 | ND_PRINTK(2, info, |
| 1319 | "RA: %s, accept_ra is false for dev: %s\n", |
| 1320 | __func__, skb->dev->name); |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1321 | goto out; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1322 | } |
David Ward | 31ce8c7 | 2009-08-29 00:04:09 -0700 | [diff] [blame] | 1323 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1324 | #ifdef CONFIG_IPV6_ROUTE_INFO |
Li RongQing | b642881 | 2014-07-10 18:02:46 +0800 | [diff] [blame] | 1325 | if (!in6_dev->cnf.accept_ra_from_local && |
| 1326 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, |
| 1327 | NULL, 0)) { |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1328 | ND_PRINTK(2, info, |
Ben Greear | d933319 | 2014-06-25 14:44:53 -0700 | [diff] [blame] | 1329 | "RA from local address detected on dev: %s: router info ignored.\n", |
| 1330 | skb->dev->name); |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1331 | goto skip_routeinfo; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1332 | } |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1333 | |
YOSHIFUJI Hideaki | 09c884d | 2006-03-20 17:07:03 -0800 | [diff] [blame] | 1334 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1335 | struct nd_opt_hdr *p; |
| 1336 | for (p = ndopts.nd_opts_ri; |
| 1337 | p; |
| 1338 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { |
YOSHIFUJI Hideaki | 6294e00 | 2008-03-15 23:56:52 -0400 | [diff] [blame] | 1339 | struct route_info *ri = (struct route_info *)p; |
| 1340 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
| 1341 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && |
| 1342 | ri->prefix_len == 0) |
| 1343 | continue; |
| 1344 | #endif |
Duan Jiong | 30e5691 | 2013-11-26 15:46:56 +0800 | [diff] [blame] | 1345 | if (ri->prefix_len == 0 && |
| 1346 | !in6_dev->cnf.accept_ra_defrtr) |
| 1347 | continue; |
YOSHIFUJI Hideaki | 6294e00 | 2008-03-15 23:56:52 -0400 | [diff] [blame] | 1348 | 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] | 1349 | continue; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 1350 | 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] | 1351 | &ipv6_hdr(skb)->saddr); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1352 | } |
| 1353 | } |
Andreas Hofmeister | 9f56220 | 2011-10-24 19:13:15 -0400 | [diff] [blame] | 1354 | |
| 1355 | skip_routeinfo: |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1356 | #endif |
| 1357 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1358 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1359 | /* skip link-specific ndopts from interior routers */ |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1360 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
| 1361 | ND_PRINTK(2, info, |
| 1362 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", |
| 1363 | __func__, skb->dev->name); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1364 | goto out; |
Ben Greear | f2a762d | 2014-06-25 14:44:52 -0700 | [diff] [blame] | 1365 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1366 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1367 | |
YOSHIFUJI Hideaki | c4fd30e | 2006-03-20 16:55:26 -0800 | [diff] [blame] | 1368 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | struct nd_opt_hdr *p; |
| 1370 | for (p = ndopts.nd_opts_pi; |
| 1371 | p; |
| 1372 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { |
Neil Horman | e6bff99 | 2012-01-04 10:49:15 +0000 | [diff] [blame] | 1373 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
| 1374 | (p->nd_opt_len) << 3, |
| 1375 | ndopts.nd_opts_src_lladdr != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | } |
| 1377 | } |
| 1378 | |
Harout Hedeshian | c2943f1 | 2015-01-20 10:06:05 -0700 | [diff] [blame] | 1379 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1380 | __be32 n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | u32 mtu; |
| 1382 | |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 1383 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1384 | mtu = ntohl(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | |
| 1386 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1387 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | } else if (in6_dev->cnf.mtu6 != mtu) { |
| 1389 | in6_dev->cnf.mtu6 = mtu; |
| 1390 | |
| 1391 | if (rt) |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1392 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
| 1394 | rt6_mtu_change(skb->dev, mtu); |
| 1395 | } |
| 1396 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1397 | |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1398 | if (ndopts.nd_useropts) { |
YOSHIFUJI Hideaki | 61cf46ad | 2008-01-22 17:32:53 +0900 | [diff] [blame] | 1399 | struct nd_opt_hdr *p; |
| 1400 | for (p = ndopts.nd_useropts; |
| 1401 | p; |
| 1402 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { |
| 1403 | ndisc_ra_useropt(skb, p); |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 1404 | } |
| 1405 | } |
| 1406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1408 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | } |
| 1410 | out: |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 1411 | ip6_rt_put(rt); |
David S. Miller | eb85718 | 2012-01-27 15:07:56 -0800 | [diff] [blame] | 1412 | if (neigh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | } |
| 1415 | |
| 1416 | static void ndisc_redirect_rcv(struct sk_buff *skb) |
| 1417 | { |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1418 | u8 *hdr; |
| 1419 | struct ndisc_options ndopts; |
| 1420 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 1421 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1422 | offsetof(struct rd_msg, opt)); |
| 1423 | |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1424 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1425 | switch (skb->ndisc_nodetype) { |
| 1426 | case NDISC_NODETYPE_HOST: |
| 1427 | case NDISC_NODETYPE_NODEFAULT: |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1428 | ND_PRINTK(2, warn, |
| 1429 | "Redirect: from host or unauthorized router\n"); |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1430 | return; |
| 1431 | } |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 1432 | #endif |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 1433 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1434 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1435 | ND_PRINTK(2, warn, |
| 1436 | "Redirect: source address is not link-local\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | return; |
| 1438 | } |
| 1439 | |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1440 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
| 1441 | return; |
| 1442 | |
Duan Jiong | c92a59e | 2013-08-22 12:07:35 +0800 | [diff] [blame] | 1443 | if (!ndopts.nd_opts_rh) { |
Duan Jiong | b55b76b | 2013-09-04 19:44:21 +0800 | [diff] [blame] | 1444 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
| 1445 | skb->dev->ifindex, 0); |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1446 | return; |
Duan Jiong | c92a59e | 2013-08-22 12:07:35 +0800 | [diff] [blame] | 1447 | } |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 1448 | |
| 1449 | hdr = (u8 *)ndopts.nd_opts_rh; |
| 1450 | hdr += 8; |
| 1451 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) |
| 1452 | return; |
| 1453 | |
David S. Miller | b94f1c0 | 2012-07-12 00:33:37 -0700 | [diff] [blame] | 1454 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | } |
| 1456 | |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 1457 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
| 1458 | struct sk_buff *orig_skb, |
| 1459 | int rd_len) |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1460 | { |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 1461 | u8 *opt = skb_put(skb, rd_len); |
| 1462 | |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1463 | memset(opt, 0, 8); |
| 1464 | *(opt++) = ND_OPT_REDIRECT_HDR; |
| 1465 | *(opt++) = (rd_len >> 3); |
| 1466 | opt += 6; |
| 1467 | |
| 1468 | 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] | 1469 | } |
| 1470 | |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1471 | 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] | 1472 | { |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1473 | struct net_device *dev = skb->dev; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1474 | struct net *net = dev_net(dev); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1475 | struct sock *sk = net->ipv6.ndisc_sk; |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1476 | int optlen = 0; |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 1477 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | struct sk_buff *buff; |
YOSHIFUJI Hideaki / 吉藤英明 | 71bcdba | 2013-01-05 16:34:51 +0000 | [diff] [blame] | 1479 | struct rd_msg *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | struct in6_addr saddr_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | struct rt6_info *rt; |
| 1482 | struct dst_entry *dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1483 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | int rd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 1486 | bool ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 1488 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1489 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
| 1490 | dev->name); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1491 | return; |
| 1492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1494 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
Brian Haley | bf0b48d | 2007-10-08 00:12:05 -0700 | [diff] [blame] | 1495 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1496 | ND_PRINTK(2, warn, |
| 1497 | "Redirect: target address is not link-local unicast\n"); |
Li Yewang | 2955652 | 2007-01-30 14:33:20 -0800 | [diff] [blame] | 1498 | return; |
| 1499 | } |
| 1500 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1501 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
YOSHIFUJI Hideaki | 95e41e9 | 2007-12-06 15:43:30 -0800 | [diff] [blame] | 1502 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1504 | dst = ip6_route_output(net, NULL, &fl6); |
RongQing.Li | 5095d64 | 2012-02-21 22:10:49 +0000 | [diff] [blame] | 1505 | if (dst->error) { |
| 1506 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | return; |
RongQing.Li | 5095d64 | 2012-02-21 22:10:49 +0000 | [diff] [blame] | 1508 | } |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1509 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 1510 | if (IS_ERR(dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | |
| 1513 | rt = (struct rt6_info *) dst; |
| 1514 | |
| 1515 | if (rt->rt6i_flags & RTF_GATEWAY) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1516 | ND_PRINTK(2, warn, |
| 1517 | "Redirect: destination is not a neighbour\n"); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1518 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | } |
Martin KaFai Lau | fd0273d | 2015-05-22 20:55:57 -0700 | [diff] [blame] | 1520 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 1521 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
| 1522 | if (peer) |
| 1523 | inet_putpeer(peer); |
| 1524 | if (!ret) |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1525 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | |
| 1527 | if (dev->addr_len) { |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1528 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
| 1529 | if (!neigh) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1530 | ND_PRINTK(2, warn, |
| 1531 | "Redirect: no neigh for target address\n"); |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1532 | goto release; |
| 1533 | } |
| 1534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | read_lock_bh(&neigh->lock); |
| 1536 | if (neigh->nud_state & NUD_VALID) { |
| 1537 | memcpy(ha_buf, neigh->ha, dev->addr_len); |
| 1538 | read_unlock_bh(&neigh->lock); |
| 1539 | ha = ha_buf; |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1540 | optlen += ndisc_opt_addr_space(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | } else |
| 1542 | read_unlock_bh(&neigh->lock); |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 1543 | |
| 1544 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | rd_len = min_t(unsigned int, |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1548 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
| 1549 | skb->len + 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | rd_len &= ~0x7; |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1551 | optlen += rd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
YOSHIFUJI Hideaki / 吉藤英明 | 2ce13576 | 2013-01-21 06:48:49 +0000 | [diff] [blame] | 1553 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
YOSHIFUJI Hideaki / 吉藤英明 | de09334 | 2013-01-21 06:48:14 +0000 | [diff] [blame] | 1554 | if (!buff) |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1555 | goto release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | |
YOSHIFUJI Hideaki / 吉藤英明 | 4d5c152 | 2013-01-21 06:49:25 +0000 | [diff] [blame] | 1557 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
| 1558 | *msg = (struct rd_msg) { |
| 1559 | .icmph = { |
| 1560 | .icmp6_type = NDISC_REDIRECT, |
| 1561 | }, |
| 1562 | .target = *target, |
| 1563 | .dest = ipv6_hdr(skb)->daddr, |
| 1564 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | /* |
| 1567 | * include target_address option |
| 1568 | */ |
| 1569 | |
| 1570 | if (ha) |
Matthias Schiffer | 33be081 | 2013-05-31 03:27:55 +0200 | [diff] [blame] | 1571 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | |
| 1573 | /* |
| 1574 | * build redirect option and copy skb over to the new packet. |
| 1575 | */ |
| 1576 | |
YOSHIFUJI Hideaki / 吉藤英明 | 9c86daf | 2013-01-21 06:48:09 +0000 | [diff] [blame] | 1577 | if (rd_len) |
YOSHIFUJI Hideaki / 吉藤英明 | 5f5a011 | 2013-01-21 06:48:53 +0000 | [diff] [blame] | 1578 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1580 | skb_dst_set(buff, dst); |
YOSHIFUJI Hideaki / 吉藤英明 | f4de84c | 2013-01-21 06:49:03 +0000 | [diff] [blame] | 1581 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
Ilpo Järvinen | d73f080 | 2009-02-06 23:47:37 -0800 | [diff] [blame] | 1582 | return; |
| 1583 | |
| 1584 | release: |
| 1585 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | } |
| 1587 | |
| 1588 | static void pndisc_redo(struct sk_buff *skb) |
| 1589 | { |
YOSHIFUJI Hideaki | 140e26fc | 2005-10-05 12:11:41 -0700 | [diff] [blame] | 1590 | ndisc_recv_ns(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | kfree_skb(skb); |
| 1592 | } |
| 1593 | |
Hannes Frederic Sowa | b800c3b | 2013-08-27 01:36:51 +0200 | [diff] [blame] | 1594 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
| 1595 | { |
| 1596 | struct inet6_dev *idev = __in6_dev_get(skb->dev); |
| 1597 | |
| 1598 | if (!idev) |
| 1599 | return true; |
| 1600 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && |
| 1601 | idev->cnf.suppress_frag_ndisc) { |
| 1602 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); |
| 1603 | return true; |
| 1604 | } |
| 1605 | return false; |
| 1606 | } |
| 1607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | int ndisc_rcv(struct sk_buff *skb) |
| 1609 | { |
| 1610 | struct nd_msg *msg; |
| 1611 | |
Hannes Frederic Sowa | b800c3b | 2013-08-27 01:36:51 +0200 | [diff] [blame] | 1612 | if (ndisc_suppress_frag_ndisc(skb)) |
| 1613 | return 0; |
| 1614 | |
YOSHIFUJI Hideaki / 吉藤英明 | 6bce6b4 | 2013-01-21 06:48:03 +0000 | [diff] [blame] | 1615 | if (skb_linearize(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | return 0; |
| 1617 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1618 | msg = (struct nd_msg *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1620 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1622 | if (ipv6_hdr(skb)->hop_limit != 255) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1623 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
| 1624 | ipv6_hdr(skb)->hop_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | return 0; |
| 1626 | } |
| 1627 | |
| 1628 | if (msg->icmph.icmp6_code != 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1629 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
| 1630 | msg->icmph.icmp6_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | return 0; |
| 1632 | } |
| 1633 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1634 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
| 1635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | switch (msg->icmph.icmp6_type) { |
| 1637 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 1638 | ndisc_recv_ns(skb); |
| 1639 | break; |
| 1640 | |
| 1641 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 1642 | ndisc_recv_na(skb); |
| 1643 | break; |
| 1644 | |
| 1645 | case NDISC_ROUTER_SOLICITATION: |
| 1646 | ndisc_recv_rs(skb); |
| 1647 | break; |
| 1648 | |
| 1649 | case NDISC_ROUTER_ADVERTISEMENT: |
| 1650 | ndisc_router_discovery(skb); |
| 1651 | break; |
| 1652 | |
| 1653 | case NDISC_REDIRECT: |
| 1654 | ndisc_redirect_rcv(skb); |
| 1655 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1656 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | |
| 1658 | return 0; |
| 1659 | } |
| 1660 | |
| 1661 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1662 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1663 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Eric Dumazet | c8507fb | 2015-07-29 12:01:41 +0200 | [diff] [blame] | 1664 | struct netdev_notifier_change_info *change_info; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1665 | struct net *net = dev_net(dev); |
Hannes Frederic Sowa | 5cb0443 | 2012-11-06 16:46:20 +0000 | [diff] [blame] | 1666 | struct inet6_dev *idev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | |
| 1668 | switch (event) { |
| 1669 | case NETDEV_CHANGEADDR: |
| 1670 | neigh_changeaddr(&nd_tbl, dev); |
Michal Kubeček | 2ac3ac8 | 2013-08-01 10:04:14 +0200 | [diff] [blame] | 1671 | fib6_run_gc(0, net, false); |
Hannes Frederic Sowa | 5cb0443 | 2012-11-06 16:46:20 +0000 | [diff] [blame] | 1672 | idev = in6_dev_get(dev); |
| 1673 | if (!idev) |
| 1674 | break; |
| 1675 | if (idev->cnf.ndisc_notify) |
| 1676 | ndisc_send_unsol_na(dev); |
| 1677 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | break; |
Eric Dumazet | c8507fb | 2015-07-29 12:01:41 +0200 | [diff] [blame] | 1679 | case NETDEV_CHANGE: |
| 1680 | change_info = ptr; |
| 1681 | if (change_info->flags_changed & IFF_NOARP) |
| 1682 | neigh_changeaddr(&nd_tbl, dev); |
| 1683 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | case NETDEV_DOWN: |
| 1685 | neigh_ifdown(&nd_tbl, dev); |
Michal Kubeček | 2ac3ac8 | 2013-08-01 10:04:14 +0200 | [diff] [blame] | 1686 | fib6_run_gc(0, net, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | break; |
Ben Hutchings | f47b946 | 2011-04-15 13:46:02 +0000 | [diff] [blame] | 1688 | case NETDEV_NOTIFY_PEERS: |
| 1689 | ndisc_send_unsol_na(dev); |
| 1690 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | default: |
| 1692 | break; |
| 1693 | } |
| 1694 | |
| 1695 | return NOTIFY_DONE; |
| 1696 | } |
| 1697 | |
| 1698 | static struct notifier_block ndisc_netdev_notifier = { |
| 1699 | .notifier_call = ndisc_netdev_event, |
| 1700 | }; |
| 1701 | |
| 1702 | #ifdef CONFIG_SYSCTL |
| 1703 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, |
| 1704 | const char *func, const char *dev_name) |
| 1705 | { |
| 1706 | static char warncomm[TASK_COMM_LEN]; |
| 1707 | static int warned; |
| 1708 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 1709 | strcpy(warncomm, current->comm); |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 1710 | 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] | 1711 | warncomm, func, |
| 1712 | dev_name, ctl->procname, |
| 1713 | dev_name, ctl->procname); |
| 1714 | warned++; |
| 1715 | } |
| 1716 | } |
| 1717 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1718 | 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] | 1719 | { |
| 1720 | struct net_device *dev = ctl->extra1; |
| 1721 | struct inet6_dev *idev; |
| 1722 | int ret; |
| 1723 | |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1724 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
| 1725 | (strcmp(ctl->procname, "base_reachable_time") == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
| 1727 | |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1728 | if (strcmp(ctl->procname, "retrans_time") == 0) |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 1729 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1730 | |
| 1731 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 1732 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
| 1733 | buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1734 | |
| 1735 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || |
YOSHIFUJI Hideaki | ad02ac1 | 2007-10-29 01:32:23 -0700 | [diff] [blame] | 1736 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 1737 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
| 1738 | buffer, lenp, ppos); |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 1739 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | ret = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | |
| 1742 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1743 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
| 1744 | idev->nd_parms->reachable_time = |
| 1745 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | idev->tstamp = jiffies; |
| 1747 | inet6_ifinfo_notify(RTM_NEWLINK, idev); |
| 1748 | in6_dev_put(idev); |
| 1749 | } |
| 1750 | return ret; |
| 1751 | } |
| 1752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | |
| 1754 | #endif |
| 1755 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1756 | static int __net_init ndisc_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | { |
| 1758 | struct ipv6_pinfo *np; |
| 1759 | struct sock *sk; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1760 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1762 | err = inet_ctl_sock_create(&sk, PF_INET6, |
| 1763 | SOCK_RAW, IPPROTO_ICMPV6, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | if (err < 0) { |
Joe Perches | 675418d | 2012-05-16 19:28:38 +0000 | [diff] [blame] | 1765 | ND_PRINTK(0, err, |
| 1766 | "NDISC: Failed to initialize the control socket (err %d)\n", |
| 1767 | err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | return err; |
| 1769 | } |
| 1770 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1771 | net->ipv6.ndisc_sk = sk; |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | np->hop_limit = 255; |
| 1775 | /* Do not loopback ndisc messages */ |
| 1776 | np->mc_loop = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1778 | return 0; |
| 1779 | } |
| 1780 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1781 | static void __net_exit ndisc_net_exit(struct net *net) |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1782 | { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 1783 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1784 | } |
| 1785 | |
| 1786 | static struct pernet_operations ndisc_net_ops = { |
| 1787 | .init = ndisc_net_init, |
| 1788 | .exit = ndisc_net_exit, |
| 1789 | }; |
| 1790 | |
| 1791 | int __init ndisc_init(void) |
| 1792 | { |
| 1793 | int err; |
| 1794 | |
| 1795 | err = register_pernet_subsys(&ndisc_net_ops); |
| 1796 | if (err) |
| 1797 | return err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1798 | /* |
| 1799 | * Initialize the neighbour table |
| 1800 | */ |
WANG Cong | d7480fd | 2014-11-10 15:59:36 -0800 | [diff] [blame] | 1801 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | |
| 1803 | #ifdef CONFIG_SYSCTL |
Jiri Pirko | 73af614 | 2013-12-07 19:26:55 +0100 | [diff] [blame] | 1804 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
Himangi Saraogi | 56ec0fb | 2014-07-25 01:49:37 +0530 | [diff] [blame] | 1805 | ndisc_ifinfo_sysctl_change); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1806 | if (err) |
| 1807 | goto out_unregister_pernet; |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1808 | out: |
Fabio Estevam | bcd081a | 2013-11-16 00:52:08 -0200 | [diff] [blame] | 1809 | #endif |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1810 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1812 | #ifdef CONFIG_SYSCTL |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1813 | out_unregister_pernet: |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1814 | unregister_pernet_subsys(&ndisc_net_ops); |
| 1815 | goto out; |
Michal Kubeček | 2c861cc | 2013-09-09 21:45:04 +0200 | [diff] [blame] | 1816 | #endif |
| 1817 | } |
| 1818 | |
| 1819 | int __init ndisc_late_init(void) |
| 1820 | { |
| 1821 | return register_netdevice_notifier(&ndisc_netdev_notifier); |
| 1822 | } |
| 1823 | |
| 1824 | void ndisc_late_cleanup(void) |
| 1825 | { |
| 1826 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | } |
| 1828 | |
| 1829 | void ndisc_cleanup(void) |
| 1830 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | #ifdef CONFIG_SYSCTL |
| 1832 | neigh_sysctl_unregister(&nd_tbl.parms); |
| 1833 | #endif |
WANG Cong | d7480fd | 2014-11-10 15:59:36 -0800 | [diff] [blame] | 1834 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
Daniel Lezcano | 1762f7e | 2008-03-07 11:15:34 -0800 | [diff] [blame] | 1835 | unregister_pernet_subsys(&ndisc_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | } |