Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Linux INET6 implementation |
| 3 | * FIB front-end. |
| 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 | * |
| 8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | /* Changes: |
| 17 | * |
| 18 | * YOSHIFUJI Hideaki @USAGI |
| 19 | * reworked default router selection. |
| 20 | * - respect outgoing interface |
| 21 | * - select from (probably) reachable routers (i.e. |
| 22 | * routers in REACHABLE, STALE, DELAY or PROBE states). |
| 23 | * - always select the same router if it is (probably) |
| 24 | * reachable. otherwise, round-robin the list. |
YOSHIFUJI Hideaki | c0bece9 | 2006-08-23 17:23:25 -0700 | [diff] [blame] | 25 | * Ville Nuorvala |
| 26 | * Fixed routing subtrees. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | */ |
| 28 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 29 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/errno.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/times.h> |
| 33 | #include <linux/socket.h> |
| 34 | #include <linux/sockios.h> |
| 35 | #include <linux/net.h> |
| 36 | #include <linux/route.h> |
| 37 | #include <linux/netdevice.h> |
| 38 | #include <linux/in6.h> |
| 39 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/proc_fs.h> |
| 42 | #include <linux/seq_file.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 43 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <net/snmp.h> |
| 45 | #include <net/ipv6.h> |
| 46 | #include <net/ip6_fib.h> |
| 47 | #include <net/ip6_route.h> |
| 48 | #include <net/ndisc.h> |
| 49 | #include <net/addrconf.h> |
| 50 | #include <net/tcp.h> |
| 51 | #include <linux/rtnetlink.h> |
| 52 | #include <net/dst.h> |
| 53 | #include <net/xfrm.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 54 | #include <net/netevent.h> |
Thomas Graf | 21713eb | 2006-08-15 00:35:24 -0700 | [diff] [blame] | 55 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | #include <asm/uaccess.h> |
| 58 | |
| 59 | #ifdef CONFIG_SYSCTL |
| 60 | #include <linux/sysctl.h> |
| 61 | #endif |
| 62 | |
| 63 | /* Set to 3 to get tracing. */ |
| 64 | #define RT6_DEBUG 2 |
| 65 | |
| 66 | #if RT6_DEBUG >= 3 |
| 67 | #define RDBG(x) printk x |
| 68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) |
| 69 | #else |
| 70 | #define RDBG(x) |
| 71 | #define RT6_TRACE(x...) do { ; } while (0) |
| 72 | #endif |
| 73 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 74 | #define CLONE_OFFLINK_ROUTE 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | static int ip6_rt_max_size = 4096; |
| 77 | static int ip6_rt_gc_min_interval = HZ / 2; |
| 78 | static int ip6_rt_gc_timeout = 60*HZ; |
| 79 | int ip6_rt_gc_interval = 30*HZ; |
| 80 | static int ip6_rt_gc_elasticity = 9; |
| 81 | static int ip6_rt_mtu_expires = 10*60*HZ; |
| 82 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; |
| 83 | |
| 84 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
| 85 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
| 86 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
| 87 | static void ip6_dst_destroy(struct dst_entry *); |
| 88 | static void ip6_dst_ifdown(struct dst_entry *, |
| 89 | struct net_device *dev, int how); |
| 90 | static int ip6_dst_gc(void); |
| 91 | |
| 92 | static int ip6_pkt_discard(struct sk_buff *skb); |
| 93 | static int ip6_pkt_discard_out(struct sk_buff *skb); |
| 94 | static void ip6_link_failure(struct sk_buff *skb); |
| 95 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); |
| 96 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 97 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 98 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, |
| 99 | struct in6_addr *gwaddr, int ifindex, |
| 100 | unsigned pref); |
| 101 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, |
| 102 | struct in6_addr *gwaddr, int ifindex); |
| 103 | #endif |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | static struct dst_ops ip6_dst_ops = { |
| 106 | .family = AF_INET6, |
| 107 | .protocol = __constant_htons(ETH_P_IPV6), |
| 108 | .gc = ip6_dst_gc, |
| 109 | .gc_thresh = 1024, |
| 110 | .check = ip6_dst_check, |
| 111 | .destroy = ip6_dst_destroy, |
| 112 | .ifdown = ip6_dst_ifdown, |
| 113 | .negative_advice = ip6_negative_advice, |
| 114 | .link_failure = ip6_link_failure, |
| 115 | .update_pmtu = ip6_rt_update_pmtu, |
Herbert Xu | 862b82c | 2007-11-13 21:43:11 -0800 | [diff] [blame^] | 116 | .local_out = ip6_local_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | .entry_size = sizeof(struct rt6_info), |
| 118 | }; |
| 119 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 120 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 121 | { |
| 122 | } |
| 123 | |
| 124 | static struct dst_ops ip6_dst_blackhole_ops = { |
| 125 | .family = AF_INET6, |
| 126 | .protocol = __constant_htons(ETH_P_IPV6), |
| 127 | .destroy = ip6_dst_destroy, |
| 128 | .check = ip6_dst_check, |
| 129 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
| 130 | .entry_size = sizeof(struct rt6_info), |
| 131 | }; |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | struct rt6_info ip6_null_entry = { |
| 134 | .u = { |
| 135 | .dst = { |
| 136 | .__refcnt = ATOMIC_INIT(1), |
| 137 | .__use = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | .obsolete = -1, |
| 139 | .error = -ENETUNREACH, |
| 140 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, |
| 141 | .input = ip6_pkt_discard, |
| 142 | .output = ip6_pkt_discard_out, |
| 143 | .ops = &ip6_dst_ops, |
| 144 | .path = (struct dst_entry*)&ip6_null_entry, |
| 145 | } |
| 146 | }, |
| 147 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 148 | .rt6i_metric = ~(u32) 0, |
| 149 | .rt6i_ref = ATOMIC_INIT(1), |
| 150 | }; |
| 151 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 152 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 153 | |
David S. Miller | 6723ab5 | 2006-10-18 21:20:57 -0700 | [diff] [blame] | 154 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
| 155 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); |
David S. Miller | 6723ab5 | 2006-10-18 21:20:57 -0700 | [diff] [blame] | 156 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 157 | struct rt6_info ip6_prohibit_entry = { |
| 158 | .u = { |
| 159 | .dst = { |
| 160 | .__refcnt = ATOMIC_INIT(1), |
| 161 | .__use = 1, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 162 | .obsolete = -1, |
| 163 | .error = -EACCES, |
| 164 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 165 | .input = ip6_pkt_prohibit, |
| 166 | .output = ip6_pkt_prohibit_out, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 167 | .ops = &ip6_dst_ops, |
| 168 | .path = (struct dst_entry*)&ip6_prohibit_entry, |
| 169 | } |
| 170 | }, |
| 171 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 172 | .rt6i_metric = ~(u32) 0, |
| 173 | .rt6i_ref = ATOMIC_INIT(1), |
| 174 | }; |
| 175 | |
| 176 | struct rt6_info ip6_blk_hole_entry = { |
| 177 | .u = { |
| 178 | .dst = { |
| 179 | .__refcnt = ATOMIC_INIT(1), |
| 180 | .__use = 1, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 181 | .obsolete = -1, |
| 182 | .error = -EINVAL, |
| 183 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 184 | .input = dst_discard, |
| 185 | .output = dst_discard, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 186 | .ops = &ip6_dst_ops, |
| 187 | .path = (struct dst_entry*)&ip6_blk_hole_entry, |
| 188 | } |
| 189 | }, |
| 190 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 191 | .rt6i_metric = ~(u32) 0, |
| 192 | .rt6i_ref = ATOMIC_INIT(1), |
| 193 | }; |
| 194 | |
| 195 | #endif |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* allocate dst with ip6_dst_ops */ |
| 198 | static __inline__ struct rt6_info *ip6_dst_alloc(void) |
| 199 | { |
| 200 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); |
| 201 | } |
| 202 | |
| 203 | static void ip6_dst_destroy(struct dst_entry *dst) |
| 204 | { |
| 205 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 206 | struct inet6_dev *idev = rt->rt6i_idev; |
| 207 | |
| 208 | if (idev != NULL) { |
| 209 | rt->rt6i_idev = NULL; |
| 210 | in6_dev_put(idev); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 211 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 215 | int how) |
| 216 | { |
| 217 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 218 | struct inet6_dev *idev = rt->rt6i_idev; |
| 219 | |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 220 | if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) { |
| 221 | struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | if (loopback_idev != NULL) { |
| 223 | rt->rt6i_idev = loopback_idev; |
| 224 | in6_dev_put(idev); |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) |
| 230 | { |
| 231 | return (rt->rt6i_flags & RTF_EXPIRES && |
| 232 | time_after(jiffies, rt->rt6i_expires)); |
| 233 | } |
| 234 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 235 | static inline int rt6_need_strict(struct in6_addr *daddr) |
| 236 | { |
| 237 | return (ipv6_addr_type(daddr) & |
| 238 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); |
| 239 | } |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | /* |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 242 | * Route lookup. Any table->tb6_lock is implied. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | */ |
| 244 | |
| 245 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, |
| 246 | int oif, |
| 247 | int strict) |
| 248 | { |
| 249 | struct rt6_info *local = NULL; |
| 250 | struct rt6_info *sprt; |
| 251 | |
| 252 | if (oif) { |
Eric Dumazet | 7cc4826 | 2007-02-09 16:22:57 -0800 | [diff] [blame] | 253 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | struct net_device *dev = sprt->rt6i_dev; |
| 255 | if (dev->ifindex == oif) |
| 256 | return sprt; |
| 257 | if (dev->flags & IFF_LOOPBACK) { |
| 258 | if (sprt->rt6i_idev == NULL || |
| 259 | sprt->rt6i_idev->dev->ifindex != oif) { |
| 260 | if (strict && oif) |
| 261 | continue; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 262 | if (local && (!oif || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | local->rt6i_idev->dev->ifindex == oif)) |
| 264 | continue; |
| 265 | } |
| 266 | local = sprt; |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | if (local) |
| 271 | return local; |
| 272 | |
| 273 | if (strict) |
| 274 | return &ip6_null_entry; |
| 275 | } |
| 276 | return rt; |
| 277 | } |
| 278 | |
YOSHIFUJI Hideaki | 2709725 | 2006-03-20 17:05:13 -0800 | [diff] [blame] | 279 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 280 | static void rt6_probe(struct rt6_info *rt) |
| 281 | { |
| 282 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; |
| 283 | /* |
| 284 | * Okay, this does not seem to be appropriate |
| 285 | * for now, however, we need to check if it |
| 286 | * is really so; aka Router Reachability Probing. |
| 287 | * |
| 288 | * Router Reachability Probe MUST be rate-limited |
| 289 | * to no more than one per minute. |
| 290 | */ |
| 291 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
| 292 | return; |
| 293 | read_lock_bh(&neigh->lock); |
| 294 | if (!(neigh->nud_state & NUD_VALID) && |
YOSHIFUJI Hideaki | 52e16356 | 2006-03-20 17:05:47 -0800 | [diff] [blame] | 295 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
YOSHIFUJI Hideaki | 2709725 | 2006-03-20 17:05:13 -0800 | [diff] [blame] | 296 | struct in6_addr mcaddr; |
| 297 | struct in6_addr *target; |
| 298 | |
| 299 | neigh->updated = jiffies; |
| 300 | read_unlock_bh(&neigh->lock); |
| 301 | |
| 302 | target = (struct in6_addr *)&neigh->primary_key; |
| 303 | addrconf_addr_solict_mult(target, &mcaddr); |
| 304 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); |
| 305 | } else |
| 306 | read_unlock_bh(&neigh->lock); |
| 307 | } |
| 308 | #else |
| 309 | static inline void rt6_probe(struct rt6_info *rt) |
| 310 | { |
| 311 | return; |
| 312 | } |
| 313 | #endif |
| 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | /* |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 316 | * Default Router Selection (RFC 2461 6.3.6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | */ |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 318 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 320 | struct net_device *dev = rt->rt6i_dev; |
David S. Miller | 161980f | 2007-04-06 11:42:27 -0700 | [diff] [blame] | 321 | if (!oif || dev->ifindex == oif) |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 322 | return 2; |
David S. Miller | 161980f | 2007-04-06 11:42:27 -0700 | [diff] [blame] | 323 | if ((dev->flags & IFF_LOOPBACK) && |
| 324 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) |
| 325 | return 1; |
| 326 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 329 | static inline int rt6_check_neigh(struct rt6_info *rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | { |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 331 | struct neighbour *neigh = rt->rt6i_nexthop; |
YOSHIFUJI Hideaki | 398bcbe | 2008-01-19 00:35:16 -0800 | [diff] [blame] | 332 | int m; |
YOSHIFUJI Hideaki | 4d0c591 | 2006-05-26 13:23:41 -0700 | [diff] [blame] | 333 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
| 334 | !(rt->rt6i_flags & RTF_GATEWAY)) |
| 335 | m = 1; |
| 336 | else if (neigh) { |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 337 | read_lock_bh(&neigh->lock); |
| 338 | if (neigh->nud_state & NUD_VALID) |
YOSHIFUJI Hideaki | 4d0c591 | 2006-05-26 13:23:41 -0700 | [diff] [blame] | 339 | m = 2; |
YOSHIFUJI Hideaki | 398bcbe | 2008-01-19 00:35:16 -0800 | [diff] [blame] | 340 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 341 | else if (neigh->nud_state & NUD_FAILED) |
| 342 | m = 0; |
| 343 | #endif |
| 344 | else |
YOSHIFUJI Hideaki | ea73ee2 | 2006-11-06 09:45:44 -0800 | [diff] [blame] | 345 | m = 1; |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 346 | read_unlock_bh(&neigh->lock); |
YOSHIFUJI Hideaki | 398bcbe | 2008-01-19 00:35:16 -0800 | [diff] [blame] | 347 | } else |
| 348 | m = 0; |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 349 | return m; |
| 350 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 352 | static int rt6_score_route(struct rt6_info *rt, int oif, |
| 353 | int strict) |
| 354 | { |
YOSHIFUJI Hideaki | 4d0c591 | 2006-05-26 13:23:41 -0700 | [diff] [blame] | 355 | int m, n; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 356 | |
YOSHIFUJI Hideaki | 4d0c591 | 2006-05-26 13:23:41 -0700 | [diff] [blame] | 357 | m = rt6_check_dev(rt, oif); |
YOSHIFUJI Hideaki | 77d16f4 | 2006-08-23 17:25:05 -0700 | [diff] [blame] | 358 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 359 | return -1; |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 360 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 361 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; |
| 362 | #endif |
YOSHIFUJI Hideaki | 4d0c591 | 2006-05-26 13:23:41 -0700 | [diff] [blame] | 363 | n = rt6_check_neigh(rt); |
YOSHIFUJI Hideaki | 557e92e | 2006-11-06 09:45:45 -0800 | [diff] [blame] | 364 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 365 | return -1; |
| 366 | return m; |
| 367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 369 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
| 370 | int *mpri, struct rt6_info *match) |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 371 | { |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 372 | int m; |
| 373 | |
| 374 | if (rt6_check_expired(rt)) |
| 375 | goto out; |
| 376 | |
| 377 | m = rt6_score_route(rt, oif, strict); |
| 378 | if (m < 0) |
| 379 | goto out; |
| 380 | |
| 381 | if (m > *mpri) { |
| 382 | if (strict & RT6_LOOKUP_F_REACHABLE) |
| 383 | rt6_probe(match); |
| 384 | *mpri = m; |
| 385 | match = rt; |
| 386 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { |
| 387 | rt6_probe(rt); |
| 388 | } |
| 389 | |
| 390 | out: |
| 391 | return match; |
| 392 | } |
| 393 | |
| 394 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, |
| 395 | struct rt6_info *rr_head, |
| 396 | u32 metric, int oif, int strict) |
| 397 | { |
| 398 | struct rt6_info *rt, *match; |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 399 | int mpri = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 401 | match = NULL; |
| 402 | for (rt = rr_head; rt && rt->rt6i_metric == metric; |
| 403 | rt = rt->u.dst.rt6_next) |
| 404 | match = find_match(rt, oif, strict, &mpri, match); |
| 405 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; |
| 406 | rt = rt->u.dst.rt6_next) |
| 407 | match = find_match(rt, oif, strict, &mpri, match); |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 408 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 409 | return match; |
| 410 | } |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 411 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 412 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
| 413 | { |
| 414 | struct rt6_info *match, *rt0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 416 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
| 417 | __FUNCTION__, fn->leaf, oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 419 | rt0 = fn->rr_ptr; |
| 420 | if (!rt0) |
| 421 | fn->rr_ptr = rt0 = fn->leaf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 423 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 425 | if (!match && |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 426 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
| 427 | struct rt6_info *next = rt0->u.dst.rt6_next; |
| 428 | |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 429 | /* no entries matched; do round-robin */ |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 430 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
| 431 | next = fn->leaf; |
| 432 | |
| 433 | if (next != rt0) |
| 434 | fn->rr_ptr = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
| 436 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 437 | RT6_TRACE("%s() => %p\n", |
| 438 | __FUNCTION__, match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
YOSHIFUJI Hideaki | 554cfb7 | 2006-03-20 17:00:26 -0800 | [diff] [blame] | 440 | return (match ? match : &ip6_null_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 443 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 444 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, |
| 445 | struct in6_addr *gwaddr) |
| 446 | { |
| 447 | struct route_info *rinfo = (struct route_info *) opt; |
| 448 | struct in6_addr prefix_buf, *prefix; |
| 449 | unsigned int pref; |
| 450 | u32 lifetime; |
| 451 | struct rt6_info *rt; |
| 452 | |
| 453 | if (len < sizeof(struct route_info)) { |
| 454 | return -EINVAL; |
| 455 | } |
| 456 | |
| 457 | /* Sanity check for prefix_len and length */ |
| 458 | if (rinfo->length > 3) { |
| 459 | return -EINVAL; |
| 460 | } else if (rinfo->prefix_len > 128) { |
| 461 | return -EINVAL; |
| 462 | } else if (rinfo->prefix_len > 64) { |
| 463 | if (rinfo->length < 2) { |
| 464 | return -EINVAL; |
| 465 | } |
| 466 | } else if (rinfo->prefix_len > 0) { |
| 467 | if (rinfo->length < 1) { |
| 468 | return -EINVAL; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | pref = rinfo->route_pref; |
| 473 | if (pref == ICMPV6_ROUTER_PREF_INVALID) |
| 474 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
| 475 | |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 476 | lifetime = ntohl(rinfo->lifetime); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 477 | if (lifetime == 0xffffffff) { |
| 478 | /* infinity */ |
| 479 | } else if (lifetime > 0x7fffffff/HZ) { |
| 480 | /* Avoid arithmetic overflow */ |
| 481 | lifetime = 0x7fffffff/HZ - 1; |
| 482 | } |
| 483 | |
| 484 | if (rinfo->length == 3) |
| 485 | prefix = (struct in6_addr *)rinfo->prefix; |
| 486 | else { |
| 487 | /* this function is safe */ |
| 488 | ipv6_addr_prefix(&prefix_buf, |
| 489 | (struct in6_addr *)rinfo->prefix, |
| 490 | rinfo->prefix_len); |
| 491 | prefix = &prefix_buf; |
| 492 | } |
| 493 | |
| 494 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); |
| 495 | |
| 496 | if (rt && !lifetime) { |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 497 | ip6_del_rt(rt); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 498 | rt = NULL; |
| 499 | } |
| 500 | |
| 501 | if (!rt && lifetime) |
| 502 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
| 503 | pref); |
| 504 | else if (rt) |
| 505 | rt->rt6i_flags = RTF_ROUTEINFO | |
| 506 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
| 507 | |
| 508 | if (rt) { |
| 509 | if (lifetime == 0xffffffff) { |
| 510 | rt->rt6i_flags &= ~RTF_EXPIRES; |
| 511 | } else { |
| 512 | rt->rt6i_expires = jiffies + HZ * lifetime; |
| 513 | rt->rt6i_flags |= RTF_EXPIRES; |
| 514 | } |
| 515 | dst_release(&rt->u.dst); |
| 516 | } |
| 517 | return 0; |
| 518 | } |
| 519 | #endif |
| 520 | |
YOSHIFUJI Hideaki | 982f56f | 2006-08-23 17:22:39 -0700 | [diff] [blame] | 521 | #define BACKTRACK(saddr) \ |
| 522 | do { \ |
| 523 | if (rt == &ip6_null_entry) { \ |
| 524 | struct fib6_node *pn; \ |
Ville Nuorvala | e0eda7b | 2006-10-16 22:11:11 -0700 | [diff] [blame] | 525 | while (1) { \ |
YOSHIFUJI Hideaki | 982f56f | 2006-08-23 17:22:39 -0700 | [diff] [blame] | 526 | if (fn->fn_flags & RTN_TL_ROOT) \ |
| 527 | goto out; \ |
| 528 | pn = fn->parent; \ |
| 529 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ |
Kim Nordlund | 8bce65b | 2006-12-13 16:38:29 -0800 | [diff] [blame] | 530 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
YOSHIFUJI Hideaki | 982f56f | 2006-08-23 17:22:39 -0700 | [diff] [blame] | 531 | else \ |
| 532 | fn = pn; \ |
| 533 | if (fn->fn_flags & RTN_RTINFO) \ |
| 534 | goto restart; \ |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 535 | } \ |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 536 | } \ |
YOSHIFUJI Hideaki | 982f56f | 2006-08-23 17:22:39 -0700 | [diff] [blame] | 537 | } while(0) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 538 | |
| 539 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, |
| 540 | struct flowi *fl, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
| 542 | struct fib6_node *fn; |
| 543 | struct rt6_info *rt; |
| 544 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 545 | read_lock_bh(&table->tb6_lock); |
| 546 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
| 547 | restart: |
| 548 | rt = fn->leaf; |
YOSHIFUJI Hideaki | 77d16f4 | 2006-08-23 17:25:05 -0700 | [diff] [blame] | 549 | rt = rt6_device_match(rt, fl->oif, flags); |
YOSHIFUJI Hideaki | 982f56f | 2006-08-23 17:22:39 -0700 | [diff] [blame] | 550 | BACKTRACK(&fl->fl6_src); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 551 | out: |
Pavel Emelyanov | 03f49f3 | 2007-11-10 21:28:34 -0800 | [diff] [blame] | 552 | dst_use(&rt->u.dst, jiffies); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 553 | read_unlock_bh(&table->tb6_lock); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 554 | return rt; |
| 555 | |
| 556 | } |
| 557 | |
| 558 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, |
| 559 | int oif, int strict) |
| 560 | { |
| 561 | struct flowi fl = { |
| 562 | .oif = oif, |
| 563 | .nl_u = { |
| 564 | .ip6_u = { |
| 565 | .daddr = *daddr, |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 566 | }, |
| 567 | }, |
| 568 | }; |
| 569 | struct dst_entry *dst; |
YOSHIFUJI Hideaki | 77d16f4 | 2006-08-23 17:25:05 -0700 | [diff] [blame] | 570 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 571 | |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 572 | if (saddr) { |
| 573 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); |
| 574 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
| 575 | } |
| 576 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 577 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
| 578 | if (dst->error == 0) |
| 579 | return (struct rt6_info *) dst; |
| 580 | |
| 581 | dst_release(dst); |
| 582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | return NULL; |
| 584 | } |
| 585 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 586 | EXPORT_SYMBOL(rt6_lookup); |
| 587 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 588 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | It takes new route entry, the addition fails by any reason the |
| 590 | route is freed. In any case, if caller does not hold it, it may |
| 591 | be destroyed. |
| 592 | */ |
| 593 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 594 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | { |
| 596 | int err; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 597 | struct fib6_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 599 | table = rt->rt6i_table; |
| 600 | write_lock_bh(&table->tb6_lock); |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 601 | err = fib6_add(&table->tb6_root, rt, info); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 602 | write_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | return err; |
| 605 | } |
| 606 | |
Thomas Graf | 40e22e8 | 2006-08-22 00:00:45 -0700 | [diff] [blame] | 607 | int ip6_ins_rt(struct rt6_info *rt) |
| 608 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 609 | return __ip6_ins_rt(rt, NULL); |
Thomas Graf | 40e22e8 | 2006-08-22 00:00:45 -0700 | [diff] [blame] | 610 | } |
| 611 | |
YOSHIFUJI Hideaki | 95a9a5b | 2006-03-20 16:55:51 -0800 | [diff] [blame] | 612 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
| 613 | struct in6_addr *saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | struct rt6_info *rt; |
| 616 | |
| 617 | /* |
| 618 | * Clone the route. |
| 619 | */ |
| 620 | |
| 621 | rt = ip6_rt_copy(ort); |
| 622 | |
| 623 | if (rt) { |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 624 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
| 625 | if (rt->rt6i_dst.plen != 128 && |
| 626 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) |
| 627 | rt->rt6i_flags |= RTF_ANYCAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 629 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 631 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | rt->rt6i_dst.plen = 128; |
| 633 | rt->rt6i_flags |= RTF_CACHE; |
| 634 | rt->u.dst.flags |= DST_HOST; |
| 635 | |
| 636 | #ifdef CONFIG_IPV6_SUBTREES |
| 637 | if (rt->rt6i_src.plen && saddr) { |
| 638 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); |
| 639 | rt->rt6i_src.plen = 128; |
| 640 | } |
| 641 | #endif |
| 642 | |
| 643 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
| 644 | |
YOSHIFUJI Hideaki | 95a9a5b | 2006-03-20 16:55:51 -0800 | [diff] [blame] | 645 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
YOSHIFUJI Hideaki | 95a9a5b | 2006-03-20 16:55:51 -0800 | [diff] [blame] | 647 | return rt; |
| 648 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
YOSHIFUJI Hideaki | 299d993 | 2006-03-20 16:58:32 -0800 | [diff] [blame] | 650 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
| 651 | { |
| 652 | struct rt6_info *rt = ip6_rt_copy(ort); |
| 653 | if (rt) { |
| 654 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
| 655 | rt->rt6i_dst.plen = 128; |
| 656 | rt->rt6i_flags |= RTF_CACHE; |
YOSHIFUJI Hideaki | 299d993 | 2006-03-20 16:58:32 -0800 | [diff] [blame] | 657 | rt->u.dst.flags |= DST_HOST; |
| 658 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
| 659 | } |
| 660 | return rt; |
| 661 | } |
| 662 | |
Pavel Emelyanov | 4acad72 | 2007-10-15 13:02:51 -0700 | [diff] [blame] | 663 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 664 | struct flowi *fl, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | { |
| 666 | struct fib6_node *fn; |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 667 | struct rt6_info *rt, *nrt; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 668 | int strict = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | int attempts = 3; |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 670 | int err; |
YOSHIFUJI Hideaki | ea659e0 | 2006-11-06 09:45:45 -0800 | [diff] [blame] | 671 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
YOSHIFUJI Hideaki | 77d16f4 | 2006-08-23 17:25:05 -0700 | [diff] [blame] | 673 | strict |= flags & RT6_LOOKUP_F_IFACE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | relookup: |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 676 | read_lock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
YOSHIFUJI Hideaki | 8238dd0 | 2006-03-20 17:04:35 -0800 | [diff] [blame] | 678 | restart_2: |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 679 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
| 681 | restart: |
Pavel Emelyanov | 4acad72 | 2007-10-15 13:02:51 -0700 | [diff] [blame] | 682 | rt = rt6_select(fn, oif, strict | reachable); |
YOSHIFUJI Hideaki | 982f56f | 2006-08-23 17:22:39 -0700 | [diff] [blame] | 683 | BACKTRACK(&fl->fl6_src); |
YOSHIFUJI Hideaki | 8238dd0 | 2006-03-20 17:04:35 -0800 | [diff] [blame] | 684 | if (rt == &ip6_null_entry || |
| 685 | rt->rt6i_flags & RTF_CACHE) |
YOSHIFUJI Hideaki | 1ddef044 | 2006-03-20 17:01:24 -0800 | [diff] [blame] | 686 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
YOSHIFUJI Hideaki | fb9de91 | 2006-03-20 16:59:08 -0800 | [diff] [blame] | 688 | dst_hold(&rt->u.dst); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 689 | read_unlock_bh(&table->tb6_lock); |
YOSHIFUJI Hideaki | fb9de91 | 2006-03-20 16:59:08 -0800 | [diff] [blame] | 690 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 691 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
YOSHIFUJI Hideaki | e40cf35 | 2006-03-20 16:59:27 -0800 | [diff] [blame] | 692 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 693 | else { |
| 694 | #if CLONE_OFFLINK_ROUTE |
| 695 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
| 696 | #else |
| 697 | goto out2; |
| 698 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
YOSHIFUJI Hideaki | e40cf35 | 2006-03-20 16:59:27 -0800 | [diff] [blame] | 700 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 701 | dst_release(&rt->u.dst); |
| 702 | rt = nrt ? : &ip6_null_entry; |
| 703 | |
| 704 | dst_hold(&rt->u.dst); |
| 705 | if (nrt) { |
Thomas Graf | 40e22e8 | 2006-08-22 00:00:45 -0700 | [diff] [blame] | 706 | err = ip6_ins_rt(nrt); |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 707 | if (!err) |
| 708 | goto out2; |
| 709 | } |
| 710 | |
| 711 | if (--attempts <= 0) |
| 712 | goto out2; |
| 713 | |
| 714 | /* |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 715 | * Race condition! In the gap, when table->tb6_lock was |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 716 | * released someone could insert this route. Relookup. |
| 717 | */ |
| 718 | dst_release(&rt->u.dst); |
| 719 | goto relookup; |
| 720 | |
| 721 | out: |
YOSHIFUJI Hideaki | 8238dd0 | 2006-03-20 17:04:35 -0800 | [diff] [blame] | 722 | if (reachable) { |
| 723 | reachable = 0; |
| 724 | goto restart_2; |
| 725 | } |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame] | 726 | dst_hold(&rt->u.dst); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 727 | read_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | out2: |
| 729 | rt->u.dst.lastuse = jiffies; |
| 730 | rt->u.dst.__use++; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 731 | |
| 732 | return rt; |
| 733 | } |
| 734 | |
Pavel Emelyanov | 4acad72 | 2007-10-15 13:02:51 -0700 | [diff] [blame] | 735 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
| 736 | struct flowi *fl, int flags) |
| 737 | { |
| 738 | return ip6_pol_route(table, fl->iif, fl, flags); |
| 739 | } |
| 740 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 741 | void ip6_route_input(struct sk_buff *skb) |
| 742 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 743 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 744 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 745 | struct flowi fl = { |
| 746 | .iif = skb->dev->ifindex, |
| 747 | .nl_u = { |
| 748 | .ip6_u = { |
| 749 | .daddr = iph->daddr, |
| 750 | .saddr = iph->saddr, |
Al Viro | 90bcaf7 | 2006-11-08 00:25:17 -0800 | [diff] [blame] | 751 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 752 | }, |
| 753 | }, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 754 | .mark = skb->mark, |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 755 | .proto = iph->nexthdr, |
| 756 | }; |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 757 | |
| 758 | if (rt6_need_strict(&iph->daddr)) |
| 759 | flags |= RT6_LOOKUP_F_IFACE; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 760 | |
| 761 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); |
| 762 | } |
| 763 | |
| 764 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, |
| 765 | struct flowi *fl, int flags) |
| 766 | { |
Pavel Emelyanov | 4acad72 | 2007-10-15 13:02:51 -0700 | [diff] [blame] | 767 | return ip6_pol_route(table, fl->oif, fl, flags); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 768 | } |
| 769 | |
| 770 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) |
| 771 | { |
| 772 | int flags = 0; |
| 773 | |
| 774 | if (rt6_need_strict(&fl->fl6_dst)) |
YOSHIFUJI Hideaki | 77d16f4 | 2006-08-23 17:25:05 -0700 | [diff] [blame] | 775 | flags |= RT6_LOOKUP_F_IFACE; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 776 | |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 777 | if (!ipv6_addr_any(&fl->fl6_src)) |
| 778 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
| 779 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 780 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 783 | EXPORT_SYMBOL(ip6_route_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 785 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
| 786 | { |
| 787 | struct rt6_info *ort = (struct rt6_info *) *dstp; |
| 788 | struct rt6_info *rt = (struct rt6_info *) |
| 789 | dst_alloc(&ip6_dst_blackhole_ops); |
| 790 | struct dst_entry *new = NULL; |
| 791 | |
| 792 | if (rt) { |
| 793 | new = &rt->u.dst; |
| 794 | |
| 795 | atomic_set(&new->__refcnt, 1); |
| 796 | new->__use = 1; |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 797 | new->input = dst_discard; |
| 798 | new->output = dst_discard; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 799 | |
| 800 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
| 801 | new->dev = ort->u.dst.dev; |
| 802 | if (new->dev) |
| 803 | dev_hold(new->dev); |
| 804 | rt->rt6i_idev = ort->rt6i_idev; |
| 805 | if (rt->rt6i_idev) |
| 806 | in6_dev_hold(rt->rt6i_idev); |
| 807 | rt->rt6i_expires = 0; |
| 808 | |
| 809 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); |
| 810 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
| 811 | rt->rt6i_metric = 0; |
| 812 | |
| 813 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); |
| 814 | #ifdef CONFIG_IPV6_SUBTREES |
| 815 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); |
| 816 | #endif |
| 817 | |
| 818 | dst_free(new); |
| 819 | } |
| 820 | |
| 821 | dst_release(*dstp); |
| 822 | *dstp = new; |
| 823 | return (new ? 0 : -ENOMEM); |
| 824 | } |
| 825 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); |
| 826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | /* |
| 828 | * Destination cache support functions |
| 829 | */ |
| 830 | |
| 831 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
| 832 | { |
| 833 | struct rt6_info *rt; |
| 834 | |
| 835 | rt = (struct rt6_info *) dst; |
| 836 | |
| 837 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
| 838 | return dst; |
| 839 | |
| 840 | return NULL; |
| 841 | } |
| 842 | |
| 843 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) |
| 844 | { |
| 845 | struct rt6_info *rt = (struct rt6_info *) dst; |
| 846 | |
| 847 | if (rt) { |
| 848 | if (rt->rt6i_flags & RTF_CACHE) |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 849 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | else |
| 851 | dst_release(dst); |
| 852 | } |
| 853 | return NULL; |
| 854 | } |
| 855 | |
| 856 | static void ip6_link_failure(struct sk_buff *skb) |
| 857 | { |
| 858 | struct rt6_info *rt; |
| 859 | |
| 860 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); |
| 861 | |
| 862 | rt = (struct rt6_info *) skb->dst; |
| 863 | if (rt) { |
| 864 | if (rt->rt6i_flags&RTF_CACHE) { |
| 865 | dst_set_expires(&rt->u.dst, 0); |
| 866 | rt->rt6i_flags |= RTF_EXPIRES; |
| 867 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) |
| 868 | rt->rt6i_node->fn_sernum = -1; |
| 869 | } |
| 870 | } |
| 871 | |
| 872 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 873 | { |
| 874 | struct rt6_info *rt6 = (struct rt6_info*)dst; |
| 875 | |
| 876 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
| 877 | rt6->rt6i_flags |= RTF_MODIFIED; |
| 878 | if (mtu < IPV6_MIN_MTU) { |
| 879 | mtu = IPV6_MIN_MTU; |
| 880 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
| 881 | } |
| 882 | dst->metrics[RTAX_MTU-1] = mtu; |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 883 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | } |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | static int ipv6_get_mtu(struct net_device *dev); |
| 888 | |
| 889 | static inline unsigned int ipv6_advmss(unsigned int mtu) |
| 890 | { |
| 891 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
| 892 | |
| 893 | if (mtu < ip6_rt_min_advmss) |
| 894 | mtu = ip6_rt_min_advmss; |
| 895 | |
| 896 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 897 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
| 898 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. |
| 899 | * IPV6_MAXPLEN is also valid and means: "any MSS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | * rely only on pmtu discovery" |
| 901 | */ |
| 902 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) |
| 903 | mtu = IPV6_MAXPLEN; |
| 904 | return mtu; |
| 905 | } |
| 906 | |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 907 | static struct dst_entry *ndisc_dst_gc_list; |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 908 | static DEFINE_SPINLOCK(ndisc_lock); |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 909 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 910 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | struct neighbour *neigh, |
| 912 | struct in6_addr *addr, |
| 913 | int (*output)(struct sk_buff *)) |
| 914 | { |
| 915 | struct rt6_info *rt; |
| 916 | struct inet6_dev *idev = in6_dev_get(dev); |
| 917 | |
| 918 | if (unlikely(idev == NULL)) |
| 919 | return NULL; |
| 920 | |
| 921 | rt = ip6_dst_alloc(); |
| 922 | if (unlikely(rt == NULL)) { |
| 923 | in6_dev_put(idev); |
| 924 | goto out; |
| 925 | } |
| 926 | |
| 927 | dev_hold(dev); |
| 928 | if (neigh) |
| 929 | neigh_hold(neigh); |
| 930 | else |
| 931 | neigh = ndisc_get_neigh(dev, addr); |
| 932 | |
| 933 | rt->rt6i_dev = dev; |
| 934 | rt->rt6i_idev = idev; |
| 935 | rt->rt6i_nexthop = neigh; |
| 936 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 937 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; |
| 938 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); |
| 939 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); |
| 940 | rt->u.dst.output = output; |
| 941 | |
| 942 | #if 0 /* there's no chance to use these for ndisc */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 943 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
| 944 | ? DST_HOST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | : 0; |
| 946 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); |
| 947 | rt->rt6i_dst.plen = 128; |
| 948 | #endif |
| 949 | |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 950 | spin_lock_bh(&ndisc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | rt->u.dst.next = ndisc_dst_gc_list; |
| 952 | ndisc_dst_gc_list = &rt->u.dst; |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 953 | spin_unlock_bh(&ndisc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
| 955 | fib6_force_start_gc(); |
| 956 | |
| 957 | out: |
YOSHIFUJI Hideaki | 40aa7b9 | 2006-10-19 13:50:09 +0900 | [diff] [blame] | 958 | return &rt->u.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | |
| 961 | int ndisc_dst_gc(int *more) |
| 962 | { |
| 963 | struct dst_entry *dst, *next, **pprev; |
| 964 | int freed; |
| 965 | |
| 966 | next = NULL; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 967 | freed = 0; |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 968 | |
| 969 | spin_lock_bh(&ndisc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | pprev = &ndisc_dst_gc_list; |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 971 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | while ((dst = *pprev) != NULL) { |
| 973 | if (!atomic_read(&dst->__refcnt)) { |
| 974 | *pprev = dst->next; |
| 975 | dst_free(dst); |
| 976 | freed++; |
| 977 | } else { |
| 978 | pprev = &dst->next; |
| 979 | (*more)++; |
| 980 | } |
| 981 | } |
| 982 | |
Thomas Graf | 5d0bbee | 2006-08-04 03:37:36 -0700 | [diff] [blame] | 983 | spin_unlock_bh(&ndisc_lock); |
| 984 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | return freed; |
| 986 | } |
| 987 | |
| 988 | static int ip6_dst_gc(void) |
| 989 | { |
| 990 | static unsigned expire = 30*HZ; |
| 991 | static unsigned long last_gc; |
| 992 | unsigned long now = jiffies; |
| 993 | |
| 994 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && |
| 995 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) |
| 996 | goto out; |
| 997 | |
| 998 | expire++; |
| 999 | fib6_run_gc(expire); |
| 1000 | last_gc = now; |
| 1001 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) |
| 1002 | expire = ip6_rt_gc_timeout>>1; |
| 1003 | |
| 1004 | out: |
| 1005 | expire -= expire>>ip6_rt_gc_elasticity; |
| 1006 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); |
| 1007 | } |
| 1008 | |
| 1009 | /* Clean host part of a prefix. Not necessary in radix tree, |
| 1010 | but results in cleaner routing tables. |
| 1011 | |
| 1012 | Remove it only when all the things will work! |
| 1013 | */ |
| 1014 | |
| 1015 | static int ipv6_get_mtu(struct net_device *dev) |
| 1016 | { |
| 1017 | int mtu = IPV6_MIN_MTU; |
| 1018 | struct inet6_dev *idev; |
| 1019 | |
| 1020 | idev = in6_dev_get(dev); |
| 1021 | if (idev) { |
| 1022 | mtu = idev->cnf.mtu6; |
| 1023 | in6_dev_put(idev); |
| 1024 | } |
| 1025 | return mtu; |
| 1026 | } |
| 1027 | |
| 1028 | int ipv6_get_hoplimit(struct net_device *dev) |
| 1029 | { |
| 1030 | int hoplimit = ipv6_devconf.hop_limit; |
| 1031 | struct inet6_dev *idev; |
| 1032 | |
| 1033 | idev = in6_dev_get(dev); |
| 1034 | if (idev) { |
| 1035 | hoplimit = idev->cnf.hop_limit; |
| 1036 | in6_dev_put(idev); |
| 1037 | } |
| 1038 | return hoplimit; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * |
| 1043 | */ |
| 1044 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1045 | int ip6_route_add(struct fib6_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | { |
| 1047 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | struct rt6_info *rt = NULL; |
| 1049 | struct net_device *dev = NULL; |
| 1050 | struct inet6_dev *idev = NULL; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1051 | struct fib6_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | int addr_type; |
| 1053 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1054 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | return -EINVAL; |
| 1056 | #ifndef CONFIG_IPV6_SUBTREES |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1057 | if (cfg->fc_src_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | return -EINVAL; |
| 1059 | #endif |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1060 | if (cfg->fc_ifindex) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | err = -ENODEV; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1062 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | if (!dev) |
| 1064 | goto out; |
| 1065 | idev = in6_dev_get(dev); |
| 1066 | if (!idev) |
| 1067 | goto out; |
| 1068 | } |
| 1069 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1070 | if (cfg->fc_metric == 0) |
| 1071 | cfg->fc_metric = IP6_RT_PRIO_USER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1073 | table = fib6_new_table(cfg->fc_table); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1074 | if (table == NULL) { |
| 1075 | err = -ENOBUFS; |
| 1076 | goto out; |
| 1077 | } |
| 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | rt = ip6_dst_alloc(); |
| 1080 | |
| 1081 | if (rt == NULL) { |
| 1082 | err = -ENOMEM; |
| 1083 | goto out; |
| 1084 | } |
| 1085 | |
| 1086 | rt->u.dst.obsolete = -1; |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1087 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1089 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
| 1090 | cfg->fc_protocol = RTPROT_BOOT; |
| 1091 | rt->rt6i_protocol = cfg->fc_protocol; |
| 1092 | |
| 1093 | addr_type = ipv6_addr_type(&cfg->fc_dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
| 1095 | if (addr_type & IPV6_ADDR_MULTICAST) |
| 1096 | rt->u.dst.input = ip6_mc_input; |
| 1097 | else |
| 1098 | rt->u.dst.input = ip6_forward; |
| 1099 | |
| 1100 | rt->u.dst.output = ip6_output; |
| 1101 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1102 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
| 1103 | rt->rt6i_dst.plen = cfg->fc_dst_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | if (rt->rt6i_dst.plen == 128) |
| 1105 | rt->u.dst.flags = DST_HOST; |
| 1106 | |
| 1107 | #ifdef CONFIG_IPV6_SUBTREES |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1108 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
| 1109 | rt->rt6i_src.plen = cfg->fc_src_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | #endif |
| 1111 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1112 | rt->rt6i_metric = cfg->fc_metric; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
| 1114 | /* We cannot add true routes via loopback here, |
| 1115 | they would result in kernel looping; promote them to reject routes |
| 1116 | */ |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1117 | if ((cfg->fc_flags & RTF_REJECT) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
| 1119 | /* hold loopback dev/idev if we haven't done so. */ |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1120 | if (dev != init_net.loopback_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | if (dev) { |
| 1122 | dev_put(dev); |
| 1123 | in6_dev_put(idev); |
| 1124 | } |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1125 | dev = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | dev_hold(dev); |
| 1127 | idev = in6_dev_get(dev); |
| 1128 | if (!idev) { |
| 1129 | err = -ENODEV; |
| 1130 | goto out; |
| 1131 | } |
| 1132 | } |
| 1133 | rt->u.dst.output = ip6_pkt_discard_out; |
| 1134 | rt->u.dst.input = ip6_pkt_discard; |
| 1135 | rt->u.dst.error = -ENETUNREACH; |
| 1136 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
| 1137 | goto install_route; |
| 1138 | } |
| 1139 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1140 | if (cfg->fc_flags & RTF_GATEWAY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | struct in6_addr *gw_addr; |
| 1142 | int gwa_type; |
| 1143 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1144 | gw_addr = &cfg->fc_gateway; |
| 1145 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | gwa_type = ipv6_addr_type(gw_addr); |
| 1147 | |
| 1148 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { |
| 1149 | struct rt6_info *grt; |
| 1150 | |
| 1151 | /* IPv6 strictly inhibits using not link-local |
| 1152 | addresses as nexthop address. |
| 1153 | Otherwise, router will not able to send redirects. |
| 1154 | It is very good, but in some (rare!) circumstances |
| 1155 | (SIT, PtP, NBMA NOARP links) it is handy to allow |
| 1156 | some exceptions. --ANK |
| 1157 | */ |
| 1158 | err = -EINVAL; |
| 1159 | if (!(gwa_type&IPV6_ADDR_UNICAST)) |
| 1160 | goto out; |
| 1161 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1162 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
| 1164 | err = -EHOSTUNREACH; |
| 1165 | if (grt == NULL) |
| 1166 | goto out; |
| 1167 | if (dev) { |
| 1168 | if (dev != grt->rt6i_dev) { |
| 1169 | dst_release(&grt->u.dst); |
| 1170 | goto out; |
| 1171 | } |
| 1172 | } else { |
| 1173 | dev = grt->rt6i_dev; |
| 1174 | idev = grt->rt6i_idev; |
| 1175 | dev_hold(dev); |
| 1176 | in6_dev_hold(grt->rt6i_idev); |
| 1177 | } |
| 1178 | if (!(grt->rt6i_flags&RTF_GATEWAY)) |
| 1179 | err = 0; |
| 1180 | dst_release(&grt->u.dst); |
| 1181 | |
| 1182 | if (err) |
| 1183 | goto out; |
| 1184 | } |
| 1185 | err = -EINVAL; |
| 1186 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) |
| 1187 | goto out; |
| 1188 | } |
| 1189 | |
| 1190 | err = -ENODEV; |
| 1191 | if (dev == NULL) |
| 1192 | goto out; |
| 1193 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1194 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
| 1196 | if (IS_ERR(rt->rt6i_nexthop)) { |
| 1197 | err = PTR_ERR(rt->rt6i_nexthop); |
| 1198 | rt->rt6i_nexthop = NULL; |
| 1199 | goto out; |
| 1200 | } |
| 1201 | } |
| 1202 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1203 | rt->rt6i_flags = cfg->fc_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
| 1205 | install_route: |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1206 | if (cfg->fc_mx) { |
| 1207 | struct nlattr *nla; |
| 1208 | int remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1210 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 1211 | int type = nla_type(nla); |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1212 | |
| 1213 | if (type) { |
| 1214 | if (type > RTAX_MAX) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | err = -EINVAL; |
| 1216 | goto out; |
| 1217 | } |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1218 | |
| 1219 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | } |
| 1222 | } |
| 1223 | |
| 1224 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) |
| 1225 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
| 1226 | if (!rt->u.dst.metrics[RTAX_MTU-1]) |
| 1227 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
| 1228 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) |
| 1229 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); |
| 1230 | rt->u.dst.dev = dev; |
| 1231 | rt->rt6i_idev = idev; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1232 | rt->rt6i_table = table; |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1233 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
| 1235 | out: |
| 1236 | if (dev) |
| 1237 | dev_put(dev); |
| 1238 | if (idev) |
| 1239 | in6_dev_put(idev); |
| 1240 | if (rt) |
YOSHIFUJI Hideaki | 40aa7b9 | 2006-10-19 13:50:09 +0900 | [diff] [blame] | 1241 | dst_free(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | return err; |
| 1243 | } |
| 1244 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1245 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | { |
| 1247 | int err; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1248 | struct fib6_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
Patrick McHardy | 6c813a7 | 2006-08-06 22:22:47 -0700 | [diff] [blame] | 1250 | if (rt == &ip6_null_entry) |
| 1251 | return -ENOENT; |
| 1252 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1253 | table = rt->rt6i_table; |
| 1254 | write_lock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1256 | err = fib6_del(rt, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | dst_release(&rt->u.dst); |
| 1258 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1259 | write_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | |
| 1261 | return err; |
| 1262 | } |
| 1263 | |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1264 | int ip6_del_rt(struct rt6_info *rt) |
| 1265 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1266 | return __ip6_del_rt(rt, NULL); |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1267 | } |
| 1268 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1269 | static int ip6_route_del(struct fib6_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1271 | struct fib6_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | struct fib6_node *fn; |
| 1273 | struct rt6_info *rt; |
| 1274 | int err = -ESRCH; |
| 1275 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1276 | table = fib6_get_table(cfg->fc_table); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1277 | if (table == NULL) |
| 1278 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1280 | read_lock_bh(&table->tb6_lock); |
| 1281 | |
| 1282 | fn = fib6_locate(&table->tb6_root, |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1283 | &cfg->fc_dst, cfg->fc_dst_len, |
| 1284 | &cfg->fc_src, cfg->fc_src_len); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | if (fn) { |
Eric Dumazet | 7cc4826 | 2007-02-09 16:22:57 -0800 | [diff] [blame] | 1287 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1288 | if (cfg->fc_ifindex && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | (rt->rt6i_dev == NULL || |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1290 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | continue; |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1292 | if (cfg->fc_flags & RTF_GATEWAY && |
| 1293 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | continue; |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1295 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | continue; |
| 1297 | dst_hold(&rt->u.dst); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1298 | read_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1300 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | } |
| 1302 | } |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1303 | read_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | |
| 1305 | return err; |
| 1306 | } |
| 1307 | |
| 1308 | /* |
| 1309 | * Handle redirects |
| 1310 | */ |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1311 | struct ip6rd_flowi { |
| 1312 | struct flowi fl; |
| 1313 | struct in6_addr gateway; |
| 1314 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1316 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, |
| 1317 | struct flowi *fl, |
| 1318 | int flags) |
| 1319 | { |
| 1320 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
| 1321 | struct rt6_info *rt; |
| 1322 | struct fib6_node *fn; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | /* |
YOSHIFUJI Hideaki | e843b9e | 2006-03-20 17:07:49 -0800 | [diff] [blame] | 1325 | * Get the "current" route for this destination and |
| 1326 | * check if the redirect has come from approriate router. |
| 1327 | * |
| 1328 | * RFC 2461 specifies that redirects should only be |
| 1329 | * accepted if they come from the nexthop to the target. |
| 1330 | * Due to the way the routes are chosen, this notion |
| 1331 | * is a bit fuzzy and one might need to check all possible |
| 1332 | * routes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1335 | read_lock_bh(&table->tb6_lock); |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1336 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
YOSHIFUJI Hideaki | e843b9e | 2006-03-20 17:07:49 -0800 | [diff] [blame] | 1337 | restart: |
Eric Dumazet | 7cc4826 | 2007-02-09 16:22:57 -0800 | [diff] [blame] | 1338 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
YOSHIFUJI Hideaki | e843b9e | 2006-03-20 17:07:49 -0800 | [diff] [blame] | 1339 | /* |
| 1340 | * Current route is on-link; redirect is always invalid. |
| 1341 | * |
| 1342 | * Seems, previous statement is not true. It could |
| 1343 | * be node, which looks for us as on-link (f.e. proxy ndisc) |
| 1344 | * But then router serving it might decide, that we should |
| 1345 | * know truth 8)8) --ANK (980726). |
| 1346 | */ |
| 1347 | if (rt6_check_expired(rt)) |
| 1348 | continue; |
| 1349 | if (!(rt->rt6i_flags & RTF_GATEWAY)) |
| 1350 | continue; |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1351 | if (fl->oif != rt->rt6i_dev->ifindex) |
YOSHIFUJI Hideaki | e843b9e | 2006-03-20 17:07:49 -0800 | [diff] [blame] | 1352 | continue; |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1353 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
YOSHIFUJI Hideaki | e843b9e | 2006-03-20 17:07:49 -0800 | [diff] [blame] | 1354 | continue; |
| 1355 | break; |
| 1356 | } |
YOSHIFUJI Hideaki | e843b9e | 2006-03-20 17:07:49 -0800 | [diff] [blame] | 1357 | |
YOSHIFUJI Hideaki | cb15d9c | 2006-08-23 17:23:11 -0700 | [diff] [blame] | 1358 | if (!rt) |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1359 | rt = &ip6_null_entry; |
YOSHIFUJI Hideaki | cb15d9c | 2006-08-23 17:23:11 -0700 | [diff] [blame] | 1360 | BACKTRACK(&fl->fl6_src); |
| 1361 | out: |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1362 | dst_hold(&rt->u.dst); |
| 1363 | |
| 1364 | read_unlock_bh(&table->tb6_lock); |
| 1365 | |
| 1366 | return rt; |
| 1367 | }; |
| 1368 | |
| 1369 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, |
| 1370 | struct in6_addr *src, |
| 1371 | struct in6_addr *gateway, |
| 1372 | struct net_device *dev) |
| 1373 | { |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 1374 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1375 | struct ip6rd_flowi rdfl = { |
| 1376 | .fl = { |
| 1377 | .oif = dev->ifindex, |
| 1378 | .nl_u = { |
| 1379 | .ip6_u = { |
| 1380 | .daddr = *dest, |
| 1381 | .saddr = *src, |
| 1382 | }, |
| 1383 | }, |
| 1384 | }, |
| 1385 | .gateway = *gateway, |
| 1386 | }; |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 1387 | |
| 1388 | if (rt6_need_strict(dest)) |
| 1389 | flags |= RT6_LOOKUP_F_IFACE; |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1390 | |
| 1391 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); |
| 1392 | } |
| 1393 | |
| 1394 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, |
| 1395 | struct in6_addr *saddr, |
| 1396 | struct neighbour *neigh, u8 *lladdr, int on_link) |
| 1397 | { |
| 1398 | struct rt6_info *rt, *nrt = NULL; |
| 1399 | struct netevent_redirect netevent; |
| 1400 | |
| 1401 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); |
| 1402 | |
| 1403 | if (rt == &ip6_null_entry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | if (net_ratelimit()) |
| 1405 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " |
| 1406 | "for redirect target\n"); |
YOSHIFUJI Hideaki | a627945 | 2006-08-23 17:18:26 -0700 | [diff] [blame] | 1407 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | } |
| 1409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | /* |
| 1411 | * We have finally decided to accept it. |
| 1412 | */ |
| 1413 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1414 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1416 | NEIGH_UPDATE_F_OVERRIDE| |
| 1417 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1418 | NEIGH_UPDATE_F_ISROUTER)) |
| 1419 | ); |
| 1420 | |
| 1421 | /* |
| 1422 | * Redirect received -> path was valid. |
| 1423 | * Look, redirects are sent only in response to data packets, |
| 1424 | * so that this nexthop apparently is reachable. --ANK |
| 1425 | */ |
| 1426 | dst_confirm(&rt->u.dst); |
| 1427 | |
| 1428 | /* Duplicate redirect: silently ignore. */ |
| 1429 | if (neigh == rt->u.dst.neighbour) |
| 1430 | goto out; |
| 1431 | |
| 1432 | nrt = ip6_rt_copy(rt); |
| 1433 | if (nrt == NULL) |
| 1434 | goto out; |
| 1435 | |
| 1436 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; |
| 1437 | if (on_link) |
| 1438 | nrt->rt6i_flags &= ~RTF_GATEWAY; |
| 1439 | |
| 1440 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); |
| 1441 | nrt->rt6i_dst.plen = 128; |
| 1442 | nrt->u.dst.flags |= DST_HOST; |
| 1443 | |
| 1444 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); |
| 1445 | nrt->rt6i_nexthop = neigh_clone(neigh); |
| 1446 | /* Reset pmtu, it may be better */ |
| 1447 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); |
| 1448 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); |
| 1449 | |
Thomas Graf | 40e22e8 | 2006-08-22 00:00:45 -0700 | [diff] [blame] | 1450 | if (ip6_ins_rt(nrt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | goto out; |
| 1452 | |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1453 | netevent.old = &rt->u.dst; |
| 1454 | netevent.new = &nrt->u.dst; |
| 1455 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
| 1456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | if (rt->rt6i_flags&RTF_CACHE) { |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1458 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | return; |
| 1460 | } |
| 1461 | |
| 1462 | out: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1463 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | return; |
| 1465 | } |
| 1466 | |
| 1467 | /* |
| 1468 | * Handle ICMP "packet too big" messages |
| 1469 | * i.e. Path MTU discovery |
| 1470 | */ |
| 1471 | |
| 1472 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, |
| 1473 | struct net_device *dev, u32 pmtu) |
| 1474 | { |
| 1475 | struct rt6_info *rt, *nrt; |
| 1476 | int allfrag = 0; |
| 1477 | |
| 1478 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); |
| 1479 | if (rt == NULL) |
| 1480 | return; |
| 1481 | |
| 1482 | if (pmtu >= dst_mtu(&rt->u.dst)) |
| 1483 | goto out; |
| 1484 | |
| 1485 | if (pmtu < IPV6_MIN_MTU) { |
| 1486 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1487 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | * MTU (1280) and a fragment header should always be included |
| 1489 | * after a node receiving Too Big message reporting PMTU is |
| 1490 | * less than the IPv6 Minimum Link MTU. |
| 1491 | */ |
| 1492 | pmtu = IPV6_MIN_MTU; |
| 1493 | allfrag = 1; |
| 1494 | } |
| 1495 | |
| 1496 | /* New mtu received -> path was valid. |
| 1497 | They are sent only in response to data packets, |
| 1498 | so that this nexthop apparently is reachable. --ANK |
| 1499 | */ |
| 1500 | dst_confirm(&rt->u.dst); |
| 1501 | |
| 1502 | /* Host route. If it is static, it would be better |
| 1503 | not to override it, but add new one, so that |
| 1504 | when cache entry will expire old pmtu |
| 1505 | would return automatically. |
| 1506 | */ |
| 1507 | if (rt->rt6i_flags & RTF_CACHE) { |
| 1508 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
| 1509 | if (allfrag) |
| 1510 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
| 1511 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); |
| 1512 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
| 1513 | goto out; |
| 1514 | } |
| 1515 | |
| 1516 | /* Network route. |
| 1517 | Two cases are possible: |
| 1518 | 1. It is connected route. Action: COW |
| 1519 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. |
| 1520 | */ |
YOSHIFUJI Hideaki | d5315b5 | 2006-03-20 16:58:48 -0800 | [diff] [blame] | 1521 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
YOSHIFUJI Hideaki | a1e7836 | 2006-03-20 16:56:32 -0800 | [diff] [blame] | 1522 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
YOSHIFUJI Hideaki | d5315b5 | 2006-03-20 16:58:48 -0800 | [diff] [blame] | 1523 | else |
| 1524 | nrt = rt6_alloc_clone(rt, daddr); |
YOSHIFUJI Hideaki | a1e7836 | 2006-03-20 16:56:32 -0800 | [diff] [blame] | 1525 | |
YOSHIFUJI Hideaki | d5315b5 | 2006-03-20 16:58:48 -0800 | [diff] [blame] | 1526 | if (nrt) { |
YOSHIFUJI Hideaki | a1e7836 | 2006-03-20 16:56:32 -0800 | [diff] [blame] | 1527 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
| 1528 | if (allfrag) |
| 1529 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
| 1530 | |
| 1531 | /* According to RFC 1981, detecting PMTU increase shouldn't be |
| 1532 | * happened within 5 mins, the recommended timer is 10 mins. |
| 1533 | * Here this route expiration time is set to ip6_rt_mtu_expires |
| 1534 | * which is 10 mins. After 10 mins the decreased pmtu is expired |
| 1535 | * and detecting PMTU increase will be automatically happened. |
| 1536 | */ |
| 1537 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); |
| 1538 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
| 1539 | |
Thomas Graf | 40e22e8 | 2006-08-22 00:00:45 -0700 | [diff] [blame] | 1540 | ip6_ins_rt(nrt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | out: |
| 1543 | dst_release(&rt->u.dst); |
| 1544 | } |
| 1545 | |
| 1546 | /* |
| 1547 | * Misc support functions |
| 1548 | */ |
| 1549 | |
| 1550 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) |
| 1551 | { |
| 1552 | struct rt6_info *rt = ip6_dst_alloc(); |
| 1553 | |
| 1554 | if (rt) { |
| 1555 | rt->u.dst.input = ort->u.dst.input; |
| 1556 | rt->u.dst.output = ort->u.dst.output; |
| 1557 | |
| 1558 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
Ville Nuorvala | 22e1e4d | 2006-10-16 22:14:26 -0700 | [diff] [blame] | 1559 | rt->u.dst.error = ort->u.dst.error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | rt->u.dst.dev = ort->u.dst.dev; |
| 1561 | if (rt->u.dst.dev) |
| 1562 | dev_hold(rt->u.dst.dev); |
| 1563 | rt->rt6i_idev = ort->rt6i_idev; |
| 1564 | if (rt->rt6i_idev) |
| 1565 | in6_dev_hold(rt->rt6i_idev); |
| 1566 | rt->u.dst.lastuse = jiffies; |
| 1567 | rt->rt6i_expires = 0; |
| 1568 | |
| 1569 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); |
| 1570 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
| 1571 | rt->rt6i_metric = 0; |
| 1572 | |
| 1573 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); |
| 1574 | #ifdef CONFIG_IPV6_SUBTREES |
| 1575 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); |
| 1576 | #endif |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1577 | rt->rt6i_table = ort->rt6i_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | } |
| 1579 | return rt; |
| 1580 | } |
| 1581 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1582 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 1583 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, |
| 1584 | struct in6_addr *gwaddr, int ifindex) |
| 1585 | { |
| 1586 | struct fib6_node *fn; |
| 1587 | struct rt6_info *rt = NULL; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1588 | struct fib6_table *table; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1589 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1590 | table = fib6_get_table(RT6_TABLE_INFO); |
| 1591 | if (table == NULL) |
| 1592 | return NULL; |
| 1593 | |
| 1594 | write_lock_bh(&table->tb6_lock); |
| 1595 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1596 | if (!fn) |
| 1597 | goto out; |
| 1598 | |
Eric Dumazet | 7cc4826 | 2007-02-09 16:22:57 -0800 | [diff] [blame] | 1599 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1600 | if (rt->rt6i_dev->ifindex != ifindex) |
| 1601 | continue; |
| 1602 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) |
| 1603 | continue; |
| 1604 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) |
| 1605 | continue; |
| 1606 | dst_hold(&rt->u.dst); |
| 1607 | break; |
| 1608 | } |
| 1609 | out: |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1610 | write_unlock_bh(&table->tb6_lock); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1611 | return rt; |
| 1612 | } |
| 1613 | |
| 1614 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, |
| 1615 | struct in6_addr *gwaddr, int ifindex, |
| 1616 | unsigned pref) |
| 1617 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1618 | struct fib6_config cfg = { |
| 1619 | .fc_table = RT6_TABLE_INFO, |
| 1620 | .fc_metric = 1024, |
| 1621 | .fc_ifindex = ifindex, |
| 1622 | .fc_dst_len = prefixlen, |
| 1623 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | |
| 1624 | RTF_UP | RTF_PREF(pref), |
| 1625 | }; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1626 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1627 | ipv6_addr_copy(&cfg.fc_dst, prefix); |
| 1628 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
| 1629 | |
YOSHIFUJI Hideaki | e317da9 | 2006-03-20 17:06:42 -0800 | [diff] [blame] | 1630 | /* We should treat it as a default route if prefix length is 0. */ |
| 1631 | if (!prefixlen) |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1632 | cfg.fc_flags |= RTF_DEFAULT; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1633 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1634 | ip6_route_add(&cfg); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 1635 | |
| 1636 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); |
| 1637 | } |
| 1638 | #endif |
| 1639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1641 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | struct rt6_info *rt; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1643 | struct fib6_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1645 | table = fib6_get_table(RT6_TABLE_DFLT); |
| 1646 | if (table == NULL) |
| 1647 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1649 | write_lock_bh(&table->tb6_lock); |
Eric Dumazet | 7cc4826 | 2007-02-09 16:22:57 -0800 | [diff] [blame] | 1650 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | if (dev == rt->rt6i_dev && |
YOSHIFUJI Hideaki | 045927f | 2006-03-20 17:00:48 -0800 | [diff] [blame] | 1652 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
| 1654 | break; |
| 1655 | } |
| 1656 | if (rt) |
| 1657 | dst_hold(&rt->u.dst); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1658 | write_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | return rt; |
| 1660 | } |
| 1661 | |
| 1662 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
YOSHIFUJI Hideaki | ebacaaa | 2006-03-20 17:04:53 -0800 | [diff] [blame] | 1663 | struct net_device *dev, |
| 1664 | unsigned int pref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1666 | struct fib6_config cfg = { |
| 1667 | .fc_table = RT6_TABLE_DFLT, |
| 1668 | .fc_metric = 1024, |
| 1669 | .fc_ifindex = dev->ifindex, |
| 1670 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | |
| 1671 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), |
| 1672 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1674 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1676 | ip6_route_add(&cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | return rt6_get_dflt_router(gwaddr, dev); |
| 1679 | } |
| 1680 | |
| 1681 | void rt6_purge_dflt_routers(void) |
| 1682 | { |
| 1683 | struct rt6_info *rt; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1684 | struct fib6_table *table; |
| 1685 | |
| 1686 | /* NOTE: Keep consistent with rt6_get_dflt_router */ |
| 1687 | table = fib6_get_table(RT6_TABLE_DFLT); |
| 1688 | if (table == NULL) |
| 1689 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | |
| 1691 | restart: |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1692 | read_lock_bh(&table->tb6_lock); |
Eric Dumazet | 7cc4826 | 2007-02-09 16:22:57 -0800 | [diff] [blame] | 1693 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
| 1695 | dst_hold(&rt->u.dst); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1696 | read_unlock_bh(&table->tb6_lock); |
Thomas Graf | e0a1ad73 | 2006-08-22 00:00:21 -0700 | [diff] [blame] | 1697 | ip6_del_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | goto restart; |
| 1699 | } |
| 1700 | } |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1701 | read_unlock_bh(&table->tb6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | } |
| 1703 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1704 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
| 1705 | struct fib6_config *cfg) |
| 1706 | { |
| 1707 | memset(cfg, 0, sizeof(*cfg)); |
| 1708 | |
| 1709 | cfg->fc_table = RT6_TABLE_MAIN; |
| 1710 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
| 1711 | cfg->fc_metric = rtmsg->rtmsg_metric; |
| 1712 | cfg->fc_expires = rtmsg->rtmsg_info; |
| 1713 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; |
| 1714 | cfg->fc_src_len = rtmsg->rtmsg_src_len; |
| 1715 | cfg->fc_flags = rtmsg->rtmsg_flags; |
| 1716 | |
| 1717 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
| 1718 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); |
| 1719 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); |
| 1720 | } |
| 1721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
| 1723 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1724 | struct fib6_config cfg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | struct in6_rtmsg rtmsg; |
| 1726 | int err; |
| 1727 | |
| 1728 | switch(cmd) { |
| 1729 | case SIOCADDRT: /* Add a route */ |
| 1730 | case SIOCDELRT: /* Delete a route */ |
| 1731 | if (!capable(CAP_NET_ADMIN)) |
| 1732 | return -EPERM; |
| 1733 | err = copy_from_user(&rtmsg, arg, |
| 1734 | sizeof(struct in6_rtmsg)); |
| 1735 | if (err) |
| 1736 | return -EFAULT; |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1737 | |
| 1738 | rtmsg_to_fib6_config(&rtmsg, &cfg); |
| 1739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | rtnl_lock(); |
| 1741 | switch (cmd) { |
| 1742 | case SIOCADDRT: |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1743 | err = ip6_route_add(&cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | break; |
| 1745 | case SIOCDELRT: |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1746 | err = ip6_route_del(&cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | break; |
| 1748 | default: |
| 1749 | err = -EINVAL; |
| 1750 | } |
| 1751 | rtnl_unlock(); |
| 1752 | |
| 1753 | return err; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1754 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | |
| 1756 | return -EINVAL; |
| 1757 | } |
| 1758 | |
| 1759 | /* |
| 1760 | * Drop the packet on the floor |
| 1761 | */ |
| 1762 | |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1763 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
| 1764 | int ipstats_mib_noroutes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | { |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1766 | int type; |
| 1767 | switch (ipstats_mib_noroutes) { |
| 1768 | case IPSTATS_MIB_INNOROUTES: |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1769 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1770 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
| 1771 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); |
| 1772 | break; |
| 1773 | } |
| 1774 | /* FALLTHROUGH */ |
| 1775 | case IPSTATS_MIB_OUTNOROUTES: |
| 1776 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); |
| 1777 | break; |
| 1778 | } |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 1779 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | kfree_skb(skb); |
| 1781 | return 0; |
| 1782 | } |
| 1783 | |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 1784 | static int ip6_pkt_discard(struct sk_buff *skb) |
| 1785 | { |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1786 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 1787 | } |
| 1788 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1789 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | { |
| 1791 | skb->dev = skb->dst->dev; |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1792 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | } |
| 1794 | |
David S. Miller | 6723ab5 | 2006-10-18 21:20:57 -0700 | [diff] [blame] | 1795 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 1796 | |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 1797 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
| 1798 | { |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1799 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 1800 | } |
| 1801 | |
| 1802 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) |
| 1803 | { |
| 1804 | skb->dev = skb->dst->dev; |
YOSHIFUJI Hideaki | 612f09e | 2007-04-13 16:18:02 -0700 | [diff] [blame] | 1805 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
Thomas Graf | 9ce8ade | 2006-10-18 20:46:54 -0700 | [diff] [blame] | 1806 | } |
| 1807 | |
David S. Miller | 6723ab5 | 2006-10-18 21:20:57 -0700 | [diff] [blame] | 1808 | #endif |
| 1809 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | /* |
| 1811 | * Allocate a dst for local (unicast / anycast) address. |
| 1812 | */ |
| 1813 | |
| 1814 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, |
| 1815 | const struct in6_addr *addr, |
| 1816 | int anycast) |
| 1817 | { |
| 1818 | struct rt6_info *rt = ip6_dst_alloc(); |
| 1819 | |
| 1820 | if (rt == NULL) |
| 1821 | return ERR_PTR(-ENOMEM); |
| 1822 | |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1823 | dev_hold(init_net.loopback_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | in6_dev_hold(idev); |
| 1825 | |
| 1826 | rt->u.dst.flags = DST_HOST; |
| 1827 | rt->u.dst.input = ip6_input; |
| 1828 | rt->u.dst.output = ip6_output; |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1829 | rt->rt6i_dev = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | rt->rt6i_idev = idev; |
| 1831 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); |
| 1832 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); |
| 1833 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
| 1834 | rt->u.dst.obsolete = -1; |
| 1835 | |
| 1836 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 1837 | if (anycast) |
| 1838 | rt->rt6i_flags |= RTF_ANYCAST; |
| 1839 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | rt->rt6i_flags |= RTF_LOCAL; |
| 1841 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
| 1842 | if (rt->rt6i_nexthop == NULL) { |
YOSHIFUJI Hideaki | 40aa7b9 | 2006-10-19 13:50:09 +0900 | [diff] [blame] | 1843 | dst_free(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | return ERR_PTR(-ENOMEM); |
| 1845 | } |
| 1846 | |
| 1847 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); |
| 1848 | rt->rt6i_dst.plen = 128; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1849 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | |
| 1851 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 1852 | |
| 1853 | return rt; |
| 1854 | } |
| 1855 | |
| 1856 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
| 1857 | { |
| 1858 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && |
| 1859 | rt != &ip6_null_entry) { |
| 1860 | RT6_TRACE("deleted by ifdown %p\n", rt); |
| 1861 | return -1; |
| 1862 | } |
| 1863 | return 0; |
| 1864 | } |
| 1865 | |
| 1866 | void rt6_ifdown(struct net_device *dev) |
| 1867 | { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1868 | fib6_clean_all(fib6_ifdown, 0, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | } |
| 1870 | |
| 1871 | struct rt6_mtu_change_arg |
| 1872 | { |
| 1873 | struct net_device *dev; |
| 1874 | unsigned mtu; |
| 1875 | }; |
| 1876 | |
| 1877 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) |
| 1878 | { |
| 1879 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; |
| 1880 | struct inet6_dev *idev; |
| 1881 | |
| 1882 | /* In IPv6 pmtu discovery is not optional, |
| 1883 | so that RTAX_MTU lock cannot disable it. |
| 1884 | We still use this lock to block changes |
| 1885 | caused by addrconf/ndisc. |
| 1886 | */ |
| 1887 | |
| 1888 | idev = __in6_dev_get(arg->dev); |
| 1889 | if (idev == NULL) |
| 1890 | return 0; |
| 1891 | |
| 1892 | /* For administrative MTU increase, there is no way to discover |
| 1893 | IPv6 PMTU increase, so PMTU increase should be updated here. |
| 1894 | Since RFC 1981 doesn't include administrative MTU increase |
| 1895 | update PMTU increase is a MUST. (i.e. jumbo frame) |
| 1896 | */ |
| 1897 | /* |
| 1898 | If new MTU is less than route PMTU, this new MTU will be the |
| 1899 | lowest MTU in the path, update the route PMTU to reflect PMTU |
| 1900 | decreases; if new MTU is greater than route PMTU, and the |
| 1901 | old MTU is the lowest MTU in the path, update the route PMTU |
| 1902 | to reflect the increase. In this case if the other nodes' MTU |
| 1903 | also have the lowest MTU, TOO BIG MESSAGE will be lead to |
| 1904 | PMTU discouvery. |
| 1905 | */ |
| 1906 | if (rt->rt6i_dev == arg->dev && |
| 1907 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1908 | (dst_mtu(&rt->u.dst) > arg->mtu || |
| 1909 | (dst_mtu(&rt->u.dst) < arg->mtu && |
Simon Arlott | 566cfd8 | 2007-07-26 00:09:55 -0700 | [diff] [blame] | 1910 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
Simon Arlott | 566cfd8 | 2007-07-26 00:09:55 -0700 | [diff] [blame] | 1912 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
| 1913 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | return 0; |
| 1915 | } |
| 1916 | |
| 1917 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) |
| 1918 | { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1919 | struct rt6_mtu_change_arg arg = { |
| 1920 | .dev = dev, |
| 1921 | .mtu = mtu, |
| 1922 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1924 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | } |
| 1926 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1927 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
Thomas Graf | 5176f91 | 2006-08-26 20:13:18 -0700 | [diff] [blame] | 1928 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1929 | [RTA_OIF] = { .type = NLA_U32 }, |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 1930 | [RTA_IIF] = { .type = NLA_U32 }, |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1931 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
| 1932 | [RTA_METRICS] = { .type = NLA_NESTED }, |
| 1933 | }; |
| 1934 | |
| 1935 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1936 | struct fib6_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1938 | struct rtmsg *rtm; |
| 1939 | struct nlattr *tb[RTA_MAX+1]; |
| 1940 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1942 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
| 1943 | if (err < 0) |
| 1944 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1946 | err = -EINVAL; |
| 1947 | rtm = nlmsg_data(nlh); |
| 1948 | memset(cfg, 0, sizeof(*cfg)); |
| 1949 | |
| 1950 | cfg->fc_table = rtm->rtm_table; |
| 1951 | cfg->fc_dst_len = rtm->rtm_dst_len; |
| 1952 | cfg->fc_src_len = rtm->rtm_src_len; |
| 1953 | cfg->fc_flags = RTF_UP; |
| 1954 | cfg->fc_protocol = rtm->rtm_protocol; |
| 1955 | |
| 1956 | if (rtm->rtm_type == RTN_UNREACHABLE) |
| 1957 | cfg->fc_flags |= RTF_REJECT; |
| 1958 | |
| 1959 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
| 1960 | cfg->fc_nlinfo.nlh = nlh; |
| 1961 | |
| 1962 | if (tb[RTA_GATEWAY]) { |
| 1963 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); |
| 1964 | cfg->fc_flags |= RTF_GATEWAY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | } |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1966 | |
| 1967 | if (tb[RTA_DST]) { |
| 1968 | int plen = (rtm->rtm_dst_len + 7) >> 3; |
| 1969 | |
| 1970 | if (nla_len(tb[RTA_DST]) < plen) |
| 1971 | goto errout; |
| 1972 | |
| 1973 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | } |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1975 | |
| 1976 | if (tb[RTA_SRC]) { |
| 1977 | int plen = (rtm->rtm_src_len + 7) >> 3; |
| 1978 | |
| 1979 | if (nla_len(tb[RTA_SRC]) < plen) |
| 1980 | goto errout; |
| 1981 | |
| 1982 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | } |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1984 | |
| 1985 | if (tb[RTA_OIF]) |
| 1986 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); |
| 1987 | |
| 1988 | if (tb[RTA_PRIORITY]) |
| 1989 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); |
| 1990 | |
| 1991 | if (tb[RTA_METRICS]) { |
| 1992 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); |
| 1993 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | } |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1995 | |
| 1996 | if (tb[RTA_TABLE]) |
| 1997 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); |
| 1998 | |
| 1999 | err = 0; |
| 2000 | errout: |
| 2001 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | } |
| 2003 | |
Thomas Graf | c127ea2 | 2007-03-22 11:58:32 -0700 | [diff] [blame] | 2004 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2006 | struct fib6_config cfg; |
| 2007 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2009 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
| 2010 | if (err < 0) |
| 2011 | return err; |
| 2012 | |
| 2013 | return ip6_route_del(&cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | } |
| 2015 | |
Thomas Graf | c127ea2 | 2007-03-22 11:58:32 -0700 | [diff] [blame] | 2016 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2018 | struct fib6_config cfg; |
| 2019 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2021 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
| 2022 | if (err < 0) |
| 2023 | return err; |
| 2024 | |
| 2025 | return ip6_route_add(&cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | } |
| 2027 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2028 | static inline size_t rt6_nlmsg_size(void) |
| 2029 | { |
| 2030 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
| 2031 | + nla_total_size(16) /* RTA_SRC */ |
| 2032 | + nla_total_size(16) /* RTA_DST */ |
| 2033 | + nla_total_size(16) /* RTA_GATEWAY */ |
| 2034 | + nla_total_size(16) /* RTA_PREFSRC */ |
| 2035 | + nla_total_size(4) /* RTA_TABLE */ |
| 2036 | + nla_total_size(4) /* RTA_IIF */ |
| 2037 | + nla_total_size(4) /* RTA_OIF */ |
| 2038 | + nla_total_size(4) /* RTA_PRIORITY */ |
Noriaki TAKAMIYA | 6a2b9ce | 2007-01-23 22:09:41 -0800 | [diff] [blame] | 2039 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2040 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
| 2041 | } |
| 2042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 2044 | struct in6_addr *dst, struct in6_addr *src, |
| 2045 | int iif, int type, u32 pid, u32 seq, |
| 2046 | int prefix, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | { |
| 2048 | struct rtmsg *rtm; |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2049 | struct nlmsghdr *nlh; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2050 | long expires; |
Patrick McHardy | 9e762a4 | 2006-08-10 23:09:48 -0700 | [diff] [blame] | 2051 | u32 table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | |
| 2053 | if (prefix) { /* user wants prefix routes only */ |
| 2054 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { |
| 2055 | /* success since this is not a prefix route */ |
| 2056 | return 1; |
| 2057 | } |
| 2058 | } |
| 2059 | |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2060 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
| 2061 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2062 | return -EMSGSIZE; |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2063 | |
| 2064 | rtm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | rtm->rtm_family = AF_INET6; |
| 2066 | rtm->rtm_dst_len = rt->rt6i_dst.plen; |
| 2067 | rtm->rtm_src_len = rt->rt6i_src.plen; |
| 2068 | rtm->rtm_tos = 0; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 2069 | if (rt->rt6i_table) |
Patrick McHardy | 9e762a4 | 2006-08-10 23:09:48 -0700 | [diff] [blame] | 2070 | table = rt->rt6i_table->tb6_id; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 2071 | else |
Patrick McHardy | 9e762a4 | 2006-08-10 23:09:48 -0700 | [diff] [blame] | 2072 | table = RT6_TABLE_UNSPEC; |
| 2073 | rtm->rtm_table = table; |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2074 | NLA_PUT_U32(skb, RTA_TABLE, table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | if (rt->rt6i_flags&RTF_REJECT) |
| 2076 | rtm->rtm_type = RTN_UNREACHABLE; |
| 2077 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
| 2078 | rtm->rtm_type = RTN_LOCAL; |
| 2079 | else |
| 2080 | rtm->rtm_type = RTN_UNICAST; |
| 2081 | rtm->rtm_flags = 0; |
| 2082 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2083 | rtm->rtm_protocol = rt->rt6i_protocol; |
| 2084 | if (rt->rt6i_flags&RTF_DYNAMIC) |
| 2085 | rtm->rtm_protocol = RTPROT_REDIRECT; |
| 2086 | else if (rt->rt6i_flags & RTF_ADDRCONF) |
| 2087 | rtm->rtm_protocol = RTPROT_KERNEL; |
| 2088 | else if (rt->rt6i_flags&RTF_DEFAULT) |
| 2089 | rtm->rtm_protocol = RTPROT_RA; |
| 2090 | |
| 2091 | if (rt->rt6i_flags&RTF_CACHE) |
| 2092 | rtm->rtm_flags |= RTM_F_CLONED; |
| 2093 | |
| 2094 | if (dst) { |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2095 | NLA_PUT(skb, RTA_DST, 16, dst); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2096 | rtm->rtm_dst_len = 128; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | } else if (rtm->rtm_dst_len) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2098 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | #ifdef CONFIG_IPV6_SUBTREES |
| 2100 | if (src) { |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2101 | NLA_PUT(skb, RTA_SRC, 16, src); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2102 | rtm->rtm_src_len = 128; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | } else if (rtm->rtm_src_len) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2104 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | #endif |
| 2106 | if (iif) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2107 | NLA_PUT_U32(skb, RTA_IIF, iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | else if (dst) { |
| 2109 | struct in6_addr saddr_buf; |
| 2110 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2111 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | } |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2115 | goto nla_put_failure; |
| 2116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | if (rt->u.dst.neighbour) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2118 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
| 2119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | if (rt->u.dst.dev) |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2121 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
| 2122 | |
| 2123 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2124 | |
| 2125 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; |
| 2126 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, |
| 2127 | expires, rt->u.dst.error) < 0) |
| 2128 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2130 | return nlmsg_end(skb, nlh); |
| 2131 | |
| 2132 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2133 | nlmsg_cancel(skb, nlh); |
| 2134 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | } |
| 2136 | |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 2137 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | { |
| 2139 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; |
| 2140 | int prefix; |
| 2141 | |
Thomas Graf | 2d7202b | 2006-08-22 00:01:27 -0700 | [diff] [blame] | 2142 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
| 2143 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
| 2145 | } else |
| 2146 | prefix = 0; |
| 2147 | |
| 2148 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
| 2149 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 2150 | prefix, NLM_F_MULTI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | } |
| 2152 | |
Thomas Graf | c127ea2 | 2007-03-22 11:58:32 -0700 | [diff] [blame] | 2153 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | { |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2155 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | struct rt6_info *rt; |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2157 | struct sk_buff *skb; |
| 2158 | struct rtmsg *rtm; |
| 2159 | struct flowi fl; |
| 2160 | int err, iif = 0; |
| 2161 | |
| 2162 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
| 2163 | if (err < 0) |
| 2164 | goto errout; |
| 2165 | |
| 2166 | err = -EINVAL; |
| 2167 | memset(&fl, 0, sizeof(fl)); |
| 2168 | |
| 2169 | if (tb[RTA_SRC]) { |
| 2170 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) |
| 2171 | goto errout; |
| 2172 | |
| 2173 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); |
| 2174 | } |
| 2175 | |
| 2176 | if (tb[RTA_DST]) { |
| 2177 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) |
| 2178 | goto errout; |
| 2179 | |
| 2180 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); |
| 2181 | } |
| 2182 | |
| 2183 | if (tb[RTA_IIF]) |
| 2184 | iif = nla_get_u32(tb[RTA_IIF]); |
| 2185 | |
| 2186 | if (tb[RTA_OIF]) |
| 2187 | fl.oif = nla_get_u32(tb[RTA_OIF]); |
| 2188 | |
| 2189 | if (iif) { |
| 2190 | struct net_device *dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 2191 | dev = __dev_get_by_index(&init_net, iif); |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2192 | if (!dev) { |
| 2193 | err = -ENODEV; |
| 2194 | goto errout; |
| 2195 | } |
| 2196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | |
| 2198 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2199 | if (skb == NULL) { |
| 2200 | err = -ENOBUFS; |
| 2201 | goto errout; |
| 2202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | |
| 2204 | /* Reserve room for dummy headers, this skb can pass |
| 2205 | through good chunk of routing engine. |
| 2206 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 2207 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
| 2209 | |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2210 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | skb->dst = &rt->u.dst; |
| 2212 | |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2213 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 2215 | nlh->nlmsg_seq, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | if (err < 0) { |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2217 | kfree_skb(skb); |
| 2218 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | } |
| 2220 | |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2221 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
Thomas Graf | ab364a6 | 2006-08-22 00:01:47 -0700 | [diff] [blame] | 2222 | errout: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | } |
| 2225 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2226 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | { |
| 2228 | struct sk_buff *skb; |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2229 | u32 pid = 0, seq = 0; |
| 2230 | struct nlmsghdr *nlh = NULL; |
Thomas Graf | 21713eb | 2006-08-15 00:35:24 -0700 | [diff] [blame] | 2231 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 2233 | if (info) { |
| 2234 | pid = info->pid; |
| 2235 | nlh = info->nlh; |
| 2236 | if (nlh) |
| 2237 | seq = nlh->nlmsg_seq; |
| 2238 | } |
| 2239 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2240 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
Thomas Graf | 21713eb | 2006-08-15 00:35:24 -0700 | [diff] [blame] | 2241 | if (skb == NULL) |
| 2242 | goto errout; |
| 2243 | |
| 2244 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2245 | if (err < 0) { |
| 2246 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ |
| 2247 | WARN_ON(err == -EMSGSIZE); |
| 2248 | kfree_skb(skb); |
| 2249 | goto errout; |
| 2250 | } |
Thomas Graf | 21713eb | 2006-08-15 00:35:24 -0700 | [diff] [blame] | 2251 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
| 2252 | errout: |
| 2253 | if (err < 0) |
| 2254 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | } |
| 2256 | |
| 2257 | /* |
| 2258 | * /proc |
| 2259 | */ |
| 2260 | |
| 2261 | #ifdef CONFIG_PROC_FS |
| 2262 | |
| 2263 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) |
| 2264 | |
| 2265 | struct rt6_proc_arg |
| 2266 | { |
| 2267 | char *buffer; |
| 2268 | int offset; |
| 2269 | int length; |
| 2270 | int skip; |
| 2271 | int len; |
| 2272 | }; |
| 2273 | |
| 2274 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) |
| 2275 | { |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2276 | struct seq_file *m = p_arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2278 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
| 2279 | rt->rt6i_dst.plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | |
| 2281 | #ifdef CONFIG_IPV6_SUBTREES |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2282 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
| 2283 | rt->rt6i_src.plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | #else |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2285 | seq_puts(m, "00000000000000000000000000000000 00 "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | #endif |
| 2287 | |
| 2288 | if (rt->rt6i_nexthop) { |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2289 | seq_printf(m, NIP6_SEQFMT, |
| 2290 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | } else { |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2292 | seq_puts(m, "00000000000000000000000000000000"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | } |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2294 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
| 2295 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), |
| 2296 | rt->u.dst.__use, rt->rt6i_flags, |
| 2297 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | return 0; |
| 2299 | } |
| 2300 | |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2301 | static int ipv6_route_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | { |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2303 | fib6_clean_all(rt6_info_route, 0, m); |
| 2304 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | } |
| 2306 | |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2307 | static int ipv6_route_open(struct inode *inode, struct file *file) |
| 2308 | { |
| 2309 | return single_open(file, ipv6_route_show, NULL); |
| 2310 | } |
| 2311 | |
| 2312 | static const struct file_operations ipv6_route_proc_fops = { |
| 2313 | .owner = THIS_MODULE, |
| 2314 | .open = ipv6_route_open, |
| 2315 | .read = seq_read, |
| 2316 | .llseek = seq_lseek, |
| 2317 | .release = single_release, |
| 2318 | }; |
| 2319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
| 2321 | { |
| 2322 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
| 2323 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, |
| 2324 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, |
| 2325 | rt6_stats.fib_rt_cache, |
| 2326 | atomic_read(&ip6_dst_ops.entries), |
| 2327 | rt6_stats.fib_discarded_routes); |
| 2328 | |
| 2329 | return 0; |
| 2330 | } |
| 2331 | |
| 2332 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) |
| 2333 | { |
| 2334 | return single_open(file, rt6_stats_seq_show, NULL); |
| 2335 | } |
| 2336 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2337 | static const struct file_operations rt6_stats_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | .owner = THIS_MODULE, |
| 2339 | .open = rt6_stats_seq_open, |
| 2340 | .read = seq_read, |
| 2341 | .llseek = seq_lseek, |
| 2342 | .release = single_release, |
| 2343 | }; |
| 2344 | #endif /* CONFIG_PROC_FS */ |
| 2345 | |
| 2346 | #ifdef CONFIG_SYSCTL |
| 2347 | |
| 2348 | static int flush_delay; |
| 2349 | |
| 2350 | static |
| 2351 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, |
| 2352 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2353 | { |
| 2354 | if (write) { |
| 2355 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
| 2356 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); |
| 2357 | return 0; |
| 2358 | } else |
| 2359 | return -EINVAL; |
| 2360 | } |
| 2361 | |
| 2362 | ctl_table ipv6_route_table[] = { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2363 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | .procname = "flush", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2365 | .data = &flush_delay, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | .maxlen = sizeof(int), |
Dave Jones | 89c8b3a1 | 2005-04-28 12:11:49 -0700 | [diff] [blame] | 2367 | .mode = 0200, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2368 | .proc_handler = &ipv6_sysctl_rtcache_flush |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | }, |
| 2370 | { |
| 2371 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, |
| 2372 | .procname = "gc_thresh", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2373 | .data = &ip6_dst_ops.gc_thresh, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | .maxlen = sizeof(int), |
| 2375 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2376 | .proc_handler = &proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | }, |
| 2378 | { |
| 2379 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, |
| 2380 | .procname = "max_size", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2381 | .data = &ip6_rt_max_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | .maxlen = sizeof(int), |
| 2383 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2384 | .proc_handler = &proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | }, |
| 2386 | { |
| 2387 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, |
| 2388 | .procname = "gc_min_interval", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2389 | .data = &ip6_rt_gc_min_interval, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | .maxlen = sizeof(int), |
| 2391 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2392 | .proc_handler = &proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | .strategy = &sysctl_jiffies, |
| 2394 | }, |
| 2395 | { |
| 2396 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, |
| 2397 | .procname = "gc_timeout", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2398 | .data = &ip6_rt_gc_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | .maxlen = sizeof(int), |
| 2400 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2401 | .proc_handler = &proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | .strategy = &sysctl_jiffies, |
| 2403 | }, |
| 2404 | { |
| 2405 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, |
| 2406 | .procname = "gc_interval", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2407 | .data = &ip6_rt_gc_interval, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | .maxlen = sizeof(int), |
| 2409 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2410 | .proc_handler = &proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | .strategy = &sysctl_jiffies, |
| 2412 | }, |
| 2413 | { |
| 2414 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, |
| 2415 | .procname = "gc_elasticity", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2416 | .data = &ip6_rt_gc_elasticity, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | .maxlen = sizeof(int), |
| 2418 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2419 | .proc_handler = &proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | .strategy = &sysctl_jiffies, |
| 2421 | }, |
| 2422 | { |
| 2423 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, |
| 2424 | .procname = "mtu_expires", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2425 | .data = &ip6_rt_mtu_expires, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | .maxlen = sizeof(int), |
| 2427 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2428 | .proc_handler = &proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | .strategy = &sysctl_jiffies, |
| 2430 | }, |
| 2431 | { |
| 2432 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, |
| 2433 | .procname = "min_adv_mss", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2434 | .data = &ip6_rt_min_advmss, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | .maxlen = sizeof(int), |
| 2436 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2437 | .proc_handler = &proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | .strategy = &sysctl_jiffies, |
| 2439 | }, |
| 2440 | { |
| 2441 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, |
| 2442 | .procname = "gc_min_interval_ms", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2443 | .data = &ip6_rt_gc_min_interval, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | .maxlen = sizeof(int), |
| 2445 | .mode = 0644, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2446 | .proc_handler = &proc_dointvec_ms_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | .strategy = &sysctl_ms_jiffies, |
| 2448 | }, |
| 2449 | { .ctl_name = 0 } |
| 2450 | }; |
| 2451 | |
| 2452 | #endif |
| 2453 | |
| 2454 | void __init ip6_route_init(void) |
| 2455 | { |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 2456 | ip6_dst_ops.kmem_cachep = |
| 2457 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2458 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2459 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; |
| 2460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | fib6_init(); |
Alexey Dobriyan | 33120b3 | 2007-11-06 05:27:11 -0800 | [diff] [blame] | 2462 | proc_net_fops_create(&init_net, "ipv6_route", 0, &ipv6_route_proc_fops); |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 2463 | proc_net_fops_create(&init_net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | #ifdef CONFIG_XFRM |
| 2465 | xfrm6_init(); |
| 2466 | #endif |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 2467 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2468 | fib6_rules_init(); |
| 2469 | #endif |
Thomas Graf | c127ea2 | 2007-03-22 11:58:32 -0700 | [diff] [blame] | 2470 | |
| 2471 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); |
| 2472 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); |
| 2473 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | } |
| 2475 | |
| 2476 | void ip6_route_cleanup(void) |
| 2477 | { |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 2478 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2479 | fib6_rules_cleanup(); |
| 2480 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2481 | #ifdef CONFIG_PROC_FS |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 2482 | proc_net_remove(&init_net, "ipv6_route"); |
| 2483 | proc_net_remove(&init_net, "rt6_stats"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | #endif |
| 2485 | #ifdef CONFIG_XFRM |
| 2486 | xfrm6_fini(); |
| 2487 | #endif |
| 2488 | rt6_ifdown(NULL); |
| 2489 | fib6_gc_cleanup(); |
| 2490 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); |
| 2491 | } |