Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * IPv4 Forwarding Information Base: semantics. |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/bitops.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/jiffies.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/socket.h> |
| 24 | #include <linux/sockios.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/in.h> |
| 27 | #include <linux/inet.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 28 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/if_arp.h> |
| 31 | #include <linux/proc_fs.h> |
| 32 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 36 | #include <net/arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <net/ip.h> |
| 38 | #include <net/protocol.h> |
| 39 | #include <net/route.h> |
| 40 | #include <net/tcp.h> |
| 41 | #include <net/sock.h> |
| 42 | #include <net/ip_fib.h> |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 43 | #include <net/netlink.h> |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 44 | #include <net/nexthop.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | #include "fib_lookup.h" |
| 47 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 48 | static DEFINE_SPINLOCK(fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | static struct hlist_head *fib_info_hash; |
| 50 | static struct hlist_head *fib_info_laddrhash; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 51 | static unsigned int fib_info_hash_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | static unsigned int fib_info_cnt; |
| 53 | |
| 54 | #define DEVINDEX_HASHBITS 8 |
| 55 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) |
| 56 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; |
| 57 | |
| 58 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 59 | |
| 60 | static DEFINE_SPINLOCK(fib_multipath_lock); |
| 61 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 62 | #define for_nexthops(fi) { \ |
| 63 | int nhsel; const struct fib_nh *nh; \ |
| 64 | for (nhsel = 0, nh = (fi)->fib_nh; \ |
| 65 | nhsel < (fi)->fib_nhs; \ |
| 66 | nh++, nhsel++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 68 | #define change_nexthops(fi) { \ |
| 69 | int nhsel; struct fib_nh *nexthop_nh; \ |
| 70 | for (nhsel = 0, nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ |
| 71 | nhsel < (fi)->fib_nhs; \ |
| 72 | nexthop_nh++, nhsel++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 75 | |
| 76 | /* Hope, that gcc will optimize it to get rid of dummy loop */ |
| 77 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 78 | #define for_nexthops(fi) { \ |
| 79 | int nhsel; const struct fib_nh *nh = (fi)->fib_nh; \ |
| 80 | for (nhsel = 0; nhsel < 1; nhsel++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 82 | #define change_nexthops(fi) { \ |
| 83 | int nhsel; \ |
| 84 | struct fib_nh *nexthop_nh = (struct fib_nh *)((fi)->fib_nh); \ |
| 85 | for (nhsel = 0; nhsel < 1; nhsel++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
| 87 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 88 | |
| 89 | #define endfor_nexthops(fi) } |
| 90 | |
| 91 | |
David S. Miller | 3be0686 | 2011-03-07 15:01:10 -0800 | [diff] [blame] | 92 | const struct fib_prop fib_props[RTN_MAX + 1] = { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 93 | [RTN_UNSPEC] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | .error = 0, |
| 95 | .scope = RT_SCOPE_NOWHERE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 96 | }, |
| 97 | [RTN_UNICAST] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | .error = 0, |
| 99 | .scope = RT_SCOPE_UNIVERSE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 100 | }, |
| 101 | [RTN_LOCAL] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | .error = 0, |
| 103 | .scope = RT_SCOPE_HOST, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 104 | }, |
| 105 | [RTN_BROADCAST] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | .error = 0, |
| 107 | .scope = RT_SCOPE_LINK, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 108 | }, |
| 109 | [RTN_ANYCAST] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | .error = 0, |
| 111 | .scope = RT_SCOPE_LINK, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 112 | }, |
| 113 | [RTN_MULTICAST] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | .error = 0, |
| 115 | .scope = RT_SCOPE_UNIVERSE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 116 | }, |
| 117 | [RTN_BLACKHOLE] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | .error = -EINVAL, |
| 119 | .scope = RT_SCOPE_UNIVERSE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 120 | }, |
| 121 | [RTN_UNREACHABLE] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | .error = -EHOSTUNREACH, |
| 123 | .scope = RT_SCOPE_UNIVERSE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 124 | }, |
| 125 | [RTN_PROHIBIT] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | .error = -EACCES, |
| 127 | .scope = RT_SCOPE_UNIVERSE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 128 | }, |
| 129 | [RTN_THROW] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | .error = -EAGAIN, |
| 131 | .scope = RT_SCOPE_UNIVERSE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 132 | }, |
| 133 | [RTN_NAT] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | .error = -EINVAL, |
| 135 | .scope = RT_SCOPE_NOWHERE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 136 | }, |
| 137 | [RTN_XRESOLVE] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | .error = -EINVAL, |
| 139 | .scope = RT_SCOPE_NOWHERE, |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 140 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | }; |
| 142 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 143 | static void rt_fibinfo_free(struct rtable __rcu **rtp) |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 144 | { |
| 145 | struct rtable *rt = rcu_dereference_protected(*rtp, 1); |
| 146 | |
| 147 | if (!rt) |
| 148 | return; |
| 149 | |
| 150 | /* Not even needed : RCU_INIT_POINTER(*rtp, NULL); |
| 151 | * because we waited an RCU grace period before calling |
| 152 | * free_fib_info_rcu() |
| 153 | */ |
| 154 | |
| 155 | dst_free(&rt->dst); |
| 156 | } |
| 157 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 158 | static void free_nh_exceptions(struct fib_nh *nh) |
| 159 | { |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 160 | struct fnhe_hash_bucket *hash; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 161 | int i; |
| 162 | |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 163 | hash = rcu_dereference_protected(nh->nh_exceptions, 1); |
| 164 | if (!hash) |
| 165 | return; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 166 | for (i = 0; i < FNHE_HASH_SIZE; i++) { |
| 167 | struct fib_nh_exception *fnhe; |
| 168 | |
| 169 | fnhe = rcu_dereference_protected(hash[i].chain, 1); |
| 170 | while (fnhe) { |
| 171 | struct fib_nh_exception *next; |
| 172 | |
| 173 | next = rcu_dereference_protected(fnhe->fnhe_next, 1); |
| 174 | |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 175 | rt_fibinfo_free(&fnhe->fnhe_rth_input); |
| 176 | rt_fibinfo_free(&fnhe->fnhe_rth_output); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 177 | |
| 178 | kfree(fnhe); |
| 179 | |
| 180 | fnhe = next; |
| 181 | } |
| 182 | } |
| 183 | kfree(hash); |
| 184 | } |
| 185 | |
| 186 | static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp) |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 187 | { |
| 188 | int cpu; |
| 189 | |
| 190 | if (!rtp) |
| 191 | return; |
| 192 | |
| 193 | for_each_possible_cpu(cpu) { |
| 194 | struct rtable *rt; |
| 195 | |
| 196 | rt = rcu_dereference_protected(*per_cpu_ptr(rtp, cpu), 1); |
| 197 | if (rt) |
| 198 | dst_free(&rt->dst); |
| 199 | } |
| 200 | free_percpu(rtp); |
| 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | /* Release a nexthop info record */ |
Yan, Zheng | 19c1ea1 | 2011-09-04 20:24:20 +0000 | [diff] [blame] | 204 | static void free_fib_info_rcu(struct rcu_head *head) |
| 205 | { |
| 206 | struct fib_info *fi = container_of(head, struct fib_info, rcu); |
| 207 | |
Yanmin Zhang | e49cc0d | 2012-05-23 15:39:45 +0000 | [diff] [blame] | 208 | change_nexthops(fi) { |
| 209 | if (nexthop_nh->nh_dev) |
| 210 | dev_put(nexthop_nh->nh_dev); |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 211 | free_nh_exceptions(nexthop_nh); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 212 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
| 213 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); |
Yanmin Zhang | e49cc0d | 2012-05-23 15:39:45 +0000 | [diff] [blame] | 214 | } endfor_nexthops(fi); |
| 215 | |
| 216 | release_net(fi->fib_net); |
Yan, Zheng | 19c1ea1 | 2011-09-04 20:24:20 +0000 | [diff] [blame] | 217 | if (fi->fib_metrics != (u32 *) dst_default_metrics) |
| 218 | kfree(fi->fib_metrics); |
| 219 | kfree(fi); |
| 220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | void free_fib_info(struct fib_info *fi) |
| 223 | { |
| 224 | if (fi->fib_dead == 0) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 225 | pr_warn("Freeing alive fib_info %p\n", fi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | return; |
| 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | fib_info_cnt--; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 229 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 230 | change_nexthops(fi) { |
| 231 | if (nexthop_nh->nh_tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 232 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 233 | } endfor_nexthops(fi); |
| 234 | #endif |
Yan, Zheng | 19c1ea1 | 2011-09-04 20:24:20 +0000 | [diff] [blame] | 235 | call_rcu(&fi->rcu, free_fib_info_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | void fib_release_info(struct fib_info *fi) |
| 239 | { |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 240 | spin_lock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (fi && --fi->fib_treeref == 0) { |
| 242 | hlist_del(&fi->fib_hash); |
| 243 | if (fi->fib_prefsrc) |
| 244 | hlist_del(&fi->fib_lhash); |
| 245 | change_nexthops(fi) { |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 246 | if (!nexthop_nh->nh_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | continue; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 248 | hlist_del(&nexthop_nh->nh_hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } endfor_nexthops(fi) |
| 250 | fi->fib_dead = 1; |
| 251 | fib_info_put(fi); |
| 252 | } |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 253 | spin_unlock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 256 | static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
| 258 | const struct fib_nh *onh = ofi->fib_nh; |
| 259 | |
| 260 | for_nexthops(fi) { |
| 261 | if (nh->nh_oif != onh->nh_oif || |
| 262 | nh->nh_gw != onh->nh_gw || |
| 263 | nh->nh_scope != onh->nh_scope || |
| 264 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 265 | nh->nh_weight != onh->nh_weight || |
| 266 | #endif |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 267 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | nh->nh_tclassid != onh->nh_tclassid || |
| 269 | #endif |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 270 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_F_DEAD)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return -1; |
| 272 | onh++; |
| 273 | } endfor_nexthops(fi); |
| 274 | return 0; |
| 275 | } |
| 276 | |
David S. Miller | 88ebc72 | 2008-01-12 21:49:01 -0800 | [diff] [blame] | 277 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
| 278 | { |
| 279 | unsigned int mask = DEVINDEX_HASHSIZE - 1; |
| 280 | |
| 281 | return (val ^ |
| 282 | (val >> DEVINDEX_HASHBITS) ^ |
| 283 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; |
| 284 | } |
| 285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
| 287 | { |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 288 | unsigned int mask = (fib_info_hash_size - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | unsigned int val = fi->fib_nhs; |
| 290 | |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 291 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 292 | val ^= (__force u32)fi->fib_prefsrc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | val ^= fi->fib_priority; |
David S. Miller | 88ebc72 | 2008-01-12 21:49:01 -0800 | [diff] [blame] | 294 | for_nexthops(fi) { |
| 295 | val ^= fib_devindex_hashfn(nh->nh_oif); |
| 296 | } endfor_nexthops(fi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; |
| 299 | } |
| 300 | |
| 301 | static struct fib_info *fib_find_info(const struct fib_info *nfi) |
| 302 | { |
| 303 | struct hlist_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | struct fib_info *fi; |
| 305 | unsigned int hash; |
| 306 | |
| 307 | hash = fib_info_hashfn(nfi); |
| 308 | head = &fib_info_hash[hash]; |
| 309 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 310 | hlist_for_each_entry(fi, head, fib_hash) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 311 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
Denis V. Lunev | 4814bdb | 2008-01-31 18:50:07 -0800 | [diff] [blame] | 312 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | if (fi->fib_nhs != nfi->fib_nhs) |
| 314 | continue; |
| 315 | if (nfi->fib_protocol == fi->fib_protocol && |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 316 | nfi->fib_scope == fi->fib_scope && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | nfi->fib_prefsrc == fi->fib_prefsrc && |
| 318 | nfi->fib_priority == fi->fib_priority && |
Eric Dumazet | f4ef85b | 2012-10-04 01:25:26 +0000 | [diff] [blame] | 319 | nfi->fib_type == fi->fib_type && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
Eric Dumazet | fcd13f4 | 2011-03-24 07:01:24 +0000 | [diff] [blame] | 321 | sizeof(u32) * RTAX_MAX) == 0 && |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 322 | ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
| 324 | return fi; |
| 325 | } |
| 326 | |
| 327 | return NULL; |
| 328 | } |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* Check, that the gateway is already configured. |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 331 | * Used only by redirect accept routine. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | */ |
Al Viro | d878e72e | 2006-09-26 22:18:13 -0700 | [diff] [blame] | 333 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
| 335 | struct hlist_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | struct fib_nh *nh; |
| 337 | unsigned int hash; |
| 338 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 339 | spin_lock(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | hash = fib_devindex_hashfn(dev->ifindex); |
| 342 | head = &fib_info_devhash[hash]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 343 | hlist_for_each_entry(nh, head, nh_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | if (nh->nh_dev == dev && |
| 345 | nh->nh_gw == gw && |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 346 | !(nh->nh_flags & RTNH_F_DEAD)) { |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 347 | spin_unlock(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | return 0; |
| 349 | } |
| 350 | } |
| 351 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 352 | spin_unlock(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | return -1; |
| 355 | } |
| 356 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 357 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
| 358 | { |
| 359 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
| 360 | + nla_total_size(4) /* RTA_TABLE */ |
| 361 | + nla_total_size(4) /* RTA_DST */ |
| 362 | + nla_total_size(4) /* RTA_PRIORITY */ |
| 363 | + nla_total_size(4); /* RTA_PREFSRC */ |
| 364 | |
| 365 | /* space for nested metrics */ |
| 366 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); |
| 367 | |
| 368 | if (fi->fib_nhs) { |
| 369 | /* Also handles the special case fib_nhs == 1 */ |
| 370 | |
| 371 | /* each nexthop is packed in an attribute */ |
| 372 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); |
| 373 | |
| 374 | /* may contain flow and gateway attribute */ |
| 375 | nhsize += 2 * nla_total_size(4); |
| 376 | |
| 377 | /* all nexthops are packed in a nested attribute */ |
| 378 | payload += nla_total_size(fi->fib_nhs * nhsize); |
| 379 | } |
| 380 | |
| 381 | return payload; |
| 382 | } |
| 383 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 384 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
Joe Perches | 9877b25 | 2013-10-17 13:34:11 -0700 | [diff] [blame] | 385 | int dst_len, u32 tb_id, const struct nl_info *info, |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 386 | unsigned int nlm_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
| 388 | struct sk_buff *skb; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 389 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 390 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 392 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 393 | if (skb == NULL) |
| 394 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 396 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 397 | fa->fa_type, key, dst_len, |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 398 | fa->fa_tos, fa->fa_info, nlm_flags); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 399 | if (err < 0) { |
| 400 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ |
| 401 | WARN_ON(err == -EMSGSIZE); |
| 402 | kfree_skb(skb); |
| 403 | goto errout; |
| 404 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 405 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 406 | info->nlh, GFP_KERNEL); |
| 407 | return; |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 408 | errout: |
| 409 | if (err < 0) |
Denis V. Lunev | 4d1169c | 2008-01-10 03:26:13 -0800 | [diff] [blame] | 410 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | /* Return the first fib alias matching TOS with |
| 414 | * priority less than or equal to PRIO. |
| 415 | */ |
| 416 | struct fib_alias *fib_find_alias(struct list_head *fah, u8 tos, u32 prio) |
| 417 | { |
| 418 | if (fah) { |
| 419 | struct fib_alias *fa; |
| 420 | list_for_each_entry(fa, fah, fa_list) { |
| 421 | if (fa->fa_tos > tos) |
| 422 | continue; |
| 423 | if (fa->fa_info->fib_priority >= prio || |
| 424 | fa->fa_tos < tos) |
| 425 | return fa; |
| 426 | } |
| 427 | } |
| 428 | return NULL; |
| 429 | } |
| 430 | |
Stephen Hemminger | c9cb6b6 | 2013-12-28 11:05:36 -0800 | [diff] [blame] | 431 | static int fib_detect_death(struct fib_info *fi, int order, |
| 432 | struct fib_info **last_resort, int *last_idx, |
| 433 | int dflt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
| 435 | struct neighbour *n; |
| 436 | int state = NUD_NONE; |
| 437 | |
| 438 | n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev); |
| 439 | if (n) { |
| 440 | state = n->nud_state; |
| 441 | neigh_release(n); |
| 442 | } |
Jianjun Kong | d9319100 | 2008-11-03 00:23:42 -0800 | [diff] [blame] | 443 | if (state == NUD_REACHABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | return 0; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 445 | if ((state & NUD_VALID) && order != dflt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | return 0; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 447 | if ((state & NUD_VALID) || |
| 448 | (*last_idx < 0 && order > dflt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | *last_resort = fi; |
| 450 | *last_idx = order; |
| 451 | } |
| 452 | return 1; |
| 453 | } |
| 454 | |
| 455 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 456 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 457 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
| 459 | int nhs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 461 | while (rtnh_ok(rtnh, remaining)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | nhs++; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 463 | rtnh = rtnh_next(rtnh, &remaining); |
| 464 | } |
| 465 | |
| 466 | /* leftover implies invalid nexthop configuration, discard it */ |
| 467 | return remaining > 0 ? 0 : nhs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 470 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
| 471 | int remaining, struct fib_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | change_nexthops(fi) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 474 | int attrlen; |
| 475 | |
| 476 | if (!rtnh_ok(rtnh, remaining)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return -EINVAL; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 478 | |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 479 | nexthop_nh->nh_flags = |
| 480 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; |
| 481 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; |
| 482 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 483 | |
| 484 | attrlen = rtnh_attrlen(rtnh); |
| 485 | if (attrlen > 0) { |
| 486 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
| 487 | |
| 488 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 489 | nexthop_nh->nh_gw = nla ? nla_get_be32(nla) : 0; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 490 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 491 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 492 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 493 | if (nexthop_nh->nh_tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 494 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | #endif |
| 496 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 497 | |
| 498 | rtnh = rtnh_next(rtnh, &remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } endfor_nexthops(fi); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | #endif |
| 505 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 506 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
| 508 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 509 | struct rtnexthop *rtnh; |
| 510 | int remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | #endif |
| 512 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 513 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | return 1; |
| 515 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 516 | if (cfg->fc_oif || cfg->fc_gw) { |
| 517 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
| 518 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | return 0; |
| 520 | return 1; |
| 521 | } |
| 522 | |
| 523 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 524 | if (cfg->fc_mp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | return 0; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 526 | |
| 527 | rtnh = cfg->fc_mp; |
| 528 | remaining = cfg->fc_mp_len; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | for_nexthops(fi) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 531 | int attrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 533 | if (!rtnh_ok(rtnh, remaining)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | return -EINVAL; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 535 | |
| 536 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | return 1; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 538 | |
| 539 | attrlen = rtnh_attrlen(rtnh); |
| 540 | if (attrlen < 0) { |
| 541 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
| 542 | |
| 543 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 544 | if (nla && nla_get_be32(nla) != nh->nh_gw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | return 1; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 546 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 547 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
| 548 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | return 1; |
| 550 | #endif |
| 551 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 552 | |
| 553 | rtnh = rtnh_next(rtnh, &remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } endfor_nexthops(fi); |
| 555 | #endif |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | |
| 560 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 561 | * Picture |
| 562 | * ------- |
| 563 | * |
| 564 | * Semantics of nexthop is very messy by historical reasons. |
| 565 | * We have to take into account, that: |
| 566 | * a) gateway can be actually local interface address, |
| 567 | * so that gatewayed route is direct. |
| 568 | * b) gateway must be on-link address, possibly |
| 569 | * described not by an ifaddr, but also by a direct route. |
| 570 | * c) If both gateway and interface are specified, they should not |
| 571 | * contradict. |
| 572 | * d) If we use tunnel routes, gateway could be not on-link. |
| 573 | * |
| 574 | * Attempt to reconcile all of these (alas, self-contradictory) conditions |
| 575 | * results in pretty ugly and hairy code with obscure logic. |
| 576 | * |
| 577 | * I chose to generalized it instead, so that the size |
| 578 | * of code does not increase practically, but it becomes |
| 579 | * much more general. |
| 580 | * Every prefix is assigned a "scope" value: "host" is local address, |
| 581 | * "link" is direct route, |
| 582 | * [ ... "site" ... "interior" ... ] |
| 583 | * and "universe" is true gateway route with global meaning. |
| 584 | * |
| 585 | * Every prefix refers to a set of "nexthop"s (gw, oif), |
| 586 | * where gw must have narrower scope. This recursion stops |
| 587 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, |
| 588 | * which means that gw is forced to be on link. |
| 589 | * |
| 590 | * Code is still hairy, but now it is apparently logically |
| 591 | * consistent and very flexible. F.e. as by-product it allows |
| 592 | * to co-exists in peace independent exterior and interior |
| 593 | * routing processes. |
| 594 | * |
| 595 | * Normally it looks as following. |
| 596 | * |
| 597 | * {universe prefix} -> (gw, oif) [scope link] |
| 598 | * | |
| 599 | * |-> {link prefix} -> (gw, oif) [scope local] |
| 600 | * | |
| 601 | * |-> {local prefix} (terminal node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 603 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
| 604 | struct fib_nh *nh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
| 606 | int err; |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 607 | struct net *net; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 608 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 610 | net = cfg->fc_nlinfo.nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (nh->nh_gw) { |
| 612 | struct fib_result res; |
| 613 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 614 | if (nh->nh_flags & RTNH_F_ONLINK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 616 | if (cfg->fc_scope >= RT_SCOPE_LINK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | return -EINVAL; |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 618 | if (inet_addr_type(net, nh->nh_gw) != RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return -EINVAL; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 620 | dev = __dev_get_by_index(net, nh->nh_oif); |
| 621 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | return -ENODEV; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 623 | if (!(dev->flags & IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | return -ENETDOWN; |
| 625 | nh->nh_dev = dev; |
| 626 | dev_hold(dev); |
| 627 | nh->nh_scope = RT_SCOPE_LINK; |
| 628 | return 0; |
| 629 | } |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 630 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | { |
David S. Miller | 9ade228 | 2011-03-12 02:02:42 -0500 | [diff] [blame] | 632 | struct flowi4 fl4 = { |
| 633 | .daddr = nh->nh_gw, |
| 634 | .flowi4_scope = cfg->fc_scope + 1, |
| 635 | .flowi4_oif = nh->nh_oif, |
Cong Wang | 6a66271 | 2014-04-15 16:25:34 -0700 | [diff] [blame] | 636 | .flowi4_iif = LOOPBACK_IFINDEX, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 637 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
| 639 | /* It is not necessary, but requires a bit of thinking */ |
David S. Miller | 9ade228 | 2011-03-12 02:02:42 -0500 | [diff] [blame] | 640 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
| 641 | fl4.flowi4_scope = RT_SCOPE_LINK; |
| 642 | err = fib_lookup(net, &fl4, &res); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 643 | if (err) { |
| 644 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | return err; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 646 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | err = -EINVAL; |
| 649 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) |
| 650 | goto out; |
| 651 | nh->nh_scope = res.scope; |
| 652 | nh->nh_oif = FIB_RES_OIF(res); |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 653 | nh->nh_dev = dev = FIB_RES_DEV(res); |
| 654 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | goto out; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 656 | dev_hold(dev); |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 657 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } else { |
| 659 | struct in_device *in_dev; |
| 660 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 661 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | return -EINVAL; |
| 663 | |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 664 | rcu_read_lock(); |
| 665 | err = -ENODEV; |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 666 | in_dev = inetdev_by_index(net, nh->nh_oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | if (in_dev == NULL) |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 668 | goto out; |
| 669 | err = -ENETDOWN; |
| 670 | if (!(in_dev->dev->flags & IFF_UP)) |
| 671 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | nh->nh_dev = in_dev->dev; |
| 673 | dev_hold(nh->nh_dev); |
| 674 | nh->nh_scope = RT_SCOPE_HOST; |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 675 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 677 | out: |
| 678 | rcu_read_unlock(); |
| 679 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 682 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 684 | unsigned int mask = (fib_info_hash_size - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 686 | return ((__force u32)val ^ |
| 687 | ((__force u32)val >> 7) ^ |
| 688 | ((__force u32)val >> 14)) & mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
| 690 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 691 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
| 693 | if (bytes <= PAGE_SIZE) |
Joonwoo Park | 88f8349 | 2007-11-26 23:29:32 +0800 | [diff] [blame] | 694 | return kzalloc(bytes, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | else |
| 696 | return (struct hlist_head *) |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 697 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
| 698 | get_order(bytes)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 701 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
| 703 | if (!hash) |
| 704 | return; |
| 705 | |
| 706 | if (bytes <= PAGE_SIZE) |
| 707 | kfree(hash); |
| 708 | else |
| 709 | free_pages((unsigned long) hash, get_order(bytes)); |
| 710 | } |
| 711 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 712 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
| 713 | struct hlist_head *new_laddrhash, |
| 714 | unsigned int new_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 716 | struct hlist_head *old_info_hash, *old_laddrhash; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 717 | unsigned int old_size = fib_info_hash_size; |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 718 | unsigned int i, bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 720 | spin_lock_bh(&fib_info_lock); |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 721 | old_info_hash = fib_info_hash; |
| 722 | old_laddrhash = fib_info_laddrhash; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 723 | fib_info_hash_size = new_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | for (i = 0; i < old_size; i++) { |
| 726 | struct hlist_head *head = &fib_info_hash[i]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 727 | struct hlist_node *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | struct fib_info *fi; |
| 729 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 730 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | struct hlist_head *dest; |
| 732 | unsigned int new_hash; |
| 733 | |
| 734 | hlist_del(&fi->fib_hash); |
| 735 | |
| 736 | new_hash = fib_info_hashfn(fi); |
| 737 | dest = &new_info_hash[new_hash]; |
| 738 | hlist_add_head(&fi->fib_hash, dest); |
| 739 | } |
| 740 | } |
| 741 | fib_info_hash = new_info_hash; |
| 742 | |
| 743 | for (i = 0; i < old_size; i++) { |
| 744 | struct hlist_head *lhead = &fib_info_laddrhash[i]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 745 | struct hlist_node *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | struct fib_info *fi; |
| 747 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 748 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | struct hlist_head *ldest; |
| 750 | unsigned int new_hash; |
| 751 | |
| 752 | hlist_del(&fi->fib_lhash); |
| 753 | |
| 754 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
| 755 | ldest = &new_laddrhash[new_hash]; |
| 756 | hlist_add_head(&fi->fib_lhash, ldest); |
| 757 | } |
| 758 | } |
| 759 | fib_info_laddrhash = new_laddrhash; |
| 760 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 761 | spin_unlock_bh(&fib_info_lock); |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 762 | |
| 763 | bytes = old_size * sizeof(struct hlist_head *); |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 764 | fib_info_hash_free(old_info_hash, bytes); |
| 765 | fib_info_hash_free(old_laddrhash, bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
| 767 | |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 768 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
| 769 | { |
| 770 | nh->nh_saddr = inet_select_addr(nh->nh_dev, |
| 771 | nh->nh_gw, |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 772 | nh->nh_parent->fib_scope); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 773 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
| 774 | |
| 775 | return nh->nh_saddr; |
| 776 | } |
| 777 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 778 | struct fib_info *fib_create_info(struct fib_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | { |
| 780 | int err; |
| 781 | struct fib_info *fi = NULL; |
| 782 | struct fib_info *ofi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | int nhs = 1; |
Denis V. Lunev | 7462bd74 | 2008-01-31 18:49:32 -0800 | [diff] [blame] | 784 | struct net *net = cfg->fc_nlinfo.nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
David S. Miller | 4c8237c | 2011-03-07 14:27:38 -0800 | [diff] [blame] | 786 | if (cfg->fc_type > RTN_MAX) |
| 787 | goto err_inval; |
| 788 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | /* Fast check to catch the most weird cases */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 790 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | goto err_inval; |
| 792 | |
| 793 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 794 | if (cfg->fc_mp) { |
| 795 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | if (nhs == 0) |
| 797 | goto err_inval; |
| 798 | } |
| 799 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
| 801 | err = -ENOBUFS; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 802 | if (fib_info_cnt >= fib_info_hash_size) { |
| 803 | unsigned int new_size = fib_info_hash_size << 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | struct hlist_head *new_info_hash; |
| 805 | struct hlist_head *new_laddrhash; |
| 806 | unsigned int bytes; |
| 807 | |
| 808 | if (!new_size) |
Eric Dumazet | d94ce9b | 2012-10-21 20:12:09 +0000 | [diff] [blame] | 809 | new_size = 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | bytes = new_size * sizeof(struct hlist_head *); |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 811 | new_info_hash = fib_info_hash_alloc(bytes); |
| 812 | new_laddrhash = fib_info_hash_alloc(bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | if (!new_info_hash || !new_laddrhash) { |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 814 | fib_info_hash_free(new_info_hash, bytes); |
| 815 | fib_info_hash_free(new_laddrhash, bytes); |
Joonwoo Park | 88f8349 | 2007-11-26 23:29:32 +0800 | [diff] [blame] | 816 | } else |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 817 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 819 | if (!fib_info_hash_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | goto failure; |
| 821 | } |
| 822 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 823 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | if (fi == NULL) |
| 825 | goto failure; |
Sergey Popovich | aeefa1e | 2014-05-06 18:23:08 +0300 | [diff] [blame] | 826 | fib_info_cnt++; |
David S. Miller | 725d1e1 | 2011-01-28 14:05:05 -0800 | [diff] [blame] | 827 | if (cfg->fc_mx) { |
| 828 | fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); |
| 829 | if (!fi->fib_metrics) |
| 830 | goto failure; |
| 831 | } else |
| 832 | fi->fib_metrics = (u32 *) dst_default_metrics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Denis V. Lunev | 57d7a60 | 2008-04-16 02:00:50 -0700 | [diff] [blame] | 834 | fi->fib_net = hold_net(net); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 835 | fi->fib_protocol = cfg->fc_protocol; |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 836 | fi->fib_scope = cfg->fc_scope; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 837 | fi->fib_flags = cfg->fc_flags; |
| 838 | fi->fib_priority = cfg->fc_priority; |
| 839 | fi->fib_prefsrc = cfg->fc_prefsrc; |
Eric Dumazet | f4ef85b | 2012-10-04 01:25:26 +0000 | [diff] [blame] | 840 | fi->fib_type = cfg->fc_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
| 842 | fi->fib_nhs = nhs; |
| 843 | change_nexthops(fi) { |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 844 | nexthop_nh->nh_parent = fi; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 845 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
Julian Anastasov | f8a1717 | 2012-10-08 11:41:17 +0000 | [diff] [blame] | 846 | if (!nexthop_nh->nh_pcpu_rth_output) |
| 847 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } endfor_nexthops(fi) |
| 849 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 850 | if (cfg->fc_mx) { |
| 851 | struct nlattr *nla; |
| 852 | int remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 854 | 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] | 855 | int type = nla_type(nla); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 856 | |
| 857 | if (type) { |
David S. Miller | 6fac262 | 2012-06-17 19:47:34 -0700 | [diff] [blame] | 858 | u32 val; |
| 859 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 860 | if (type > RTAX_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | goto err_inval; |
David S. Miller | 6fac262 | 2012-06-17 19:47:34 -0700 | [diff] [blame] | 862 | val = nla_get_u32(nla); |
| 863 | if (type == RTAX_ADVMSS && val > 65535 - 40) |
| 864 | val = 65535 - 40; |
David S. Miller | 710ab6c | 2012-07-10 07:02:09 -0700 | [diff] [blame] | 865 | if (type == RTAX_MTU && val > 65535 - 15) |
| 866 | val = 65535 - 15; |
David S. Miller | 6fac262 | 2012-06-17 19:47:34 -0700 | [diff] [blame] | 867 | fi->fib_metrics[type - 1] = val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
| 870 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 872 | if (cfg->fc_mp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 874 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg); |
| 875 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | goto failure; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 877 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | goto err_inval; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 879 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | goto err_inval; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 881 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 882 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | goto err_inval; |
| 884 | #endif |
| 885 | #else |
| 886 | goto err_inval; |
| 887 | #endif |
| 888 | } else { |
| 889 | struct fib_nh *nh = fi->fib_nh; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 890 | |
| 891 | nh->nh_oif = cfg->fc_oif; |
| 892 | nh->nh_gw = cfg->fc_gw; |
| 893 | nh->nh_flags = cfg->fc_flags; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 894 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 895 | nh->nh_tclassid = cfg->fc_flow; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 896 | if (nh->nh_tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 897 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 900 | nh->nh_weight = 1; |
| 901 | #endif |
| 902 | } |
| 903 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 904 | if (fib_props[cfg->fc_type].error) { |
| 905 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | goto err_inval; |
| 907 | goto link_it; |
David S. Miller | 4c8237c | 2011-03-07 14:27:38 -0800 | [diff] [blame] | 908 | } else { |
| 909 | switch (cfg->fc_type) { |
| 910 | case RTN_UNICAST: |
| 911 | case RTN_LOCAL: |
| 912 | case RTN_BROADCAST: |
| 913 | case RTN_ANYCAST: |
| 914 | case RTN_MULTICAST: |
| 915 | break; |
| 916 | default: |
| 917 | goto err_inval; |
| 918 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | } |
| 920 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 921 | if (cfg->fc_scope > RT_SCOPE_HOST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | goto err_inval; |
| 923 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 924 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | struct fib_nh *nh = fi->fib_nh; |
| 926 | |
| 927 | /* Local address is added. */ |
| 928 | if (nhs != 1 || nh->nh_gw) |
| 929 | goto err_inval; |
| 930 | nh->nh_scope = RT_SCOPE_NOWHERE; |
Denis V. Lunev | 7462bd74 | 2008-01-31 18:49:32 -0800 | [diff] [blame] | 931 | nh->nh_dev = dev_get_by_index(net, fi->fib_nh->nh_oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | err = -ENODEV; |
| 933 | if (nh->nh_dev == NULL) |
| 934 | goto failure; |
| 935 | } else { |
| 936 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 937 | err = fib_check_nh(cfg, fi, nexthop_nh); |
| 938 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | goto failure; |
| 940 | } endfor_nexthops(fi) |
| 941 | } |
| 942 | |
| 943 | if (fi->fib_prefsrc) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 944 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || |
| 945 | fi->fib_prefsrc != cfg->fc_dst) |
Denis V. Lunev | 7462bd74 | 2008-01-31 18:49:32 -0800 | [diff] [blame] | 946 | if (inet_addr_type(net, fi->fib_prefsrc) != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | goto err_inval; |
| 948 | } |
| 949 | |
David S. Miller | 1fc050a | 2011-03-07 20:54:48 -0800 | [diff] [blame] | 950 | change_nexthops(fi) { |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 951 | fib_info_update_nh_saddr(net, nexthop_nh); |
David S. Miller | 1fc050a | 2011-03-07 20:54:48 -0800 | [diff] [blame] | 952 | } endfor_nexthops(fi) |
| 953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | link_it: |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 955 | ofi = fib_find_info(fi); |
| 956 | if (ofi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | fi->fib_dead = 1; |
| 958 | free_fib_info(fi); |
| 959 | ofi->fib_treeref++; |
| 960 | return ofi; |
| 961 | } |
| 962 | |
| 963 | fi->fib_treeref++; |
| 964 | atomic_inc(&fi->fib_clntref); |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 965 | spin_lock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | hlist_add_head(&fi->fib_hash, |
| 967 | &fib_info_hash[fib_info_hashfn(fi)]); |
| 968 | if (fi->fib_prefsrc) { |
| 969 | struct hlist_head *head; |
| 970 | |
| 971 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; |
| 972 | hlist_add_head(&fi->fib_lhash, head); |
| 973 | } |
| 974 | change_nexthops(fi) { |
| 975 | struct hlist_head *head; |
| 976 | unsigned int hash; |
| 977 | |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 978 | if (!nexthop_nh->nh_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | continue; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 980 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | head = &fib_info_devhash[hash]; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 982 | hlist_add_head(&nexthop_nh->nh_hash, head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | } endfor_nexthops(fi) |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 984 | spin_unlock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | return fi; |
| 986 | |
| 987 | err_inval: |
| 988 | err = -EINVAL; |
| 989 | |
| 990 | failure: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 991 | if (fi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | fi->fib_dead = 1; |
| 993 | free_fib_info(fi); |
| 994 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 995 | |
| 996 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 999 | int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 1000 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1001 | struct fib_info *fi, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | { |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1003 | struct nlmsghdr *nlh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | struct rtmsg *rtm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1006 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1007 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1008 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1009 | |
| 1010 | rtm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | rtm->rtm_family = AF_INET; |
| 1012 | rtm->rtm_dst_len = dst_len; |
| 1013 | rtm->rtm_src_len = 0; |
| 1014 | rtm->rtm_tos = tos; |
Krzysztof Piotr Oledzki | 709772e | 2008-06-10 15:44:49 -0700 | [diff] [blame] | 1015 | if (tb_id < 256) |
| 1016 | rtm->rtm_table = tb_id; |
| 1017 | else |
| 1018 | rtm->rtm_table = RT_TABLE_COMPAT; |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1019 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
| 1020 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | rtm->rtm_type = type; |
| 1022 | rtm->rtm_flags = fi->fib_flags; |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 1023 | rtm->rtm_scope = fi->fib_scope; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | rtm->rtm_protocol = fi->fib_protocol; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1025 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1026 | if (rtm->rtm_dst_len && |
| 1027 | nla_put_be32(skb, RTA_DST, dst)) |
| 1028 | goto nla_put_failure; |
| 1029 | if (fi->fib_priority && |
| 1030 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) |
| 1031 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1033 | goto nla_put_failure; |
| 1034 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1035 | if (fi->fib_prefsrc && |
| 1036 | nla_put_be32(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
| 1037 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | if (fi->fib_nhs == 1) { |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1039 | if (fi->fib_nh->nh_gw && |
| 1040 | nla_put_be32(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
| 1041 | goto nla_put_failure; |
| 1042 | if (fi->fib_nh->nh_oif && |
| 1043 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) |
| 1044 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1045 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1046 | if (fi->fib_nh[0].nh_tclassid && |
| 1047 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) |
| 1048 | goto nla_put_failure; |
Patrick McHardy | 8265abc | 2006-07-21 15:09:55 -0700 | [diff] [blame] | 1049 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | } |
| 1051 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 1052 | if (fi->fib_nhs > 1) { |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1053 | struct rtnexthop *rtnh; |
| 1054 | struct nlattr *mp; |
| 1055 | |
| 1056 | mp = nla_nest_start(skb, RTA_MULTIPATH); |
| 1057 | if (mp == NULL) |
| 1058 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
| 1060 | for_nexthops(fi) { |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1061 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
| 1062 | if (rtnh == NULL) |
| 1063 | goto nla_put_failure; |
| 1064 | |
| 1065 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; |
| 1066 | rtnh->rtnh_hops = nh->nh_weight - 1; |
| 1067 | rtnh->rtnh_ifindex = nh->nh_oif; |
| 1068 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1069 | if (nh->nh_gw && |
| 1070 | nla_put_be32(skb, RTA_GATEWAY, nh->nh_gw)) |
| 1071 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1072 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1073 | if (nh->nh_tclassid && |
| 1074 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) |
| 1075 | goto nla_put_failure; |
Patrick McHardy | 8265abc | 2006-07-21 15:09:55 -0700 | [diff] [blame] | 1076 | #endif |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1077 | /* length of rtnetlink header + attributes */ |
| 1078 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | } endfor_nexthops(fi); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1080 | |
| 1081 | nla_nest_end(skb, mp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | } |
| 1083 | #endif |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1084 | return nlmsg_end(skb, nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1086 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1087 | nlmsg_cancel(skb, nlh); |
| 1088 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } |
| 1090 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1092 | * Update FIB if: |
| 1093 | * - local address disappeared -> we must delete all the entries |
| 1094 | * referring to it. |
| 1095 | * - device went down -> we must shutdown all nexthops going via it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | */ |
Denis V. Lunev | 4814bdb | 2008-01-31 18:50:07 -0800 | [diff] [blame] | 1097 | int fib_sync_down_addr(struct net *net, __be32 local) |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1098 | { |
| 1099 | int ret = 0; |
| 1100 | unsigned int hash = fib_laddr_hashfn(local); |
| 1101 | struct hlist_head *head = &fib_info_laddrhash[hash]; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1102 | struct fib_info *fi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1104 | if (fib_info_laddrhash == NULL || local == 0) |
| 1105 | return 0; |
| 1106 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1107 | hlist_for_each_entry(fi, head, fib_lhash) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1108 | if (!net_eq(fi->fib_net, net)) |
Denis V. Lunev | 4814bdb | 2008-01-31 18:50:07 -0800 | [diff] [blame] | 1109 | continue; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1110 | if (fi->fib_prefsrc == local) { |
| 1111 | fi->fib_flags |= RTNH_F_DEAD; |
| 1112 | ret++; |
| 1113 | } |
| 1114 | } |
| 1115 | return ret; |
| 1116 | } |
| 1117 | |
| 1118 | int fib_sync_down_dev(struct net_device *dev, int force) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | { |
| 1120 | int ret = 0; |
| 1121 | int scope = RT_SCOPE_NOWHERE; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1122 | struct fib_info *prev_fi = NULL; |
| 1123 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); |
| 1124 | struct hlist_head *head = &fib_info_devhash[hash]; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1125 | struct fib_nh *nh; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | if (force) |
| 1128 | scope = -1; |
| 1129 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1130 | hlist_for_each_entry(nh, head, nh_hash) { |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1131 | struct fib_info *fi = nh->nh_parent; |
| 1132 | int dead; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1134 | BUG_ON(!fi->fib_nhs); |
| 1135 | if (nh->nh_dev != dev || fi == prev_fi) |
| 1136 | continue; |
| 1137 | prev_fi = fi; |
| 1138 | dead = 0; |
| 1139 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1140 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1141 | dead++; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1142 | else if (nexthop_nh->nh_dev == dev && |
| 1143 | nexthop_nh->nh_scope != scope) { |
| 1144 | nexthop_nh->nh_flags |= RTNH_F_DEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1146 | spin_lock_bh(&fib_multipath_lock); |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1147 | fi->fib_power -= nexthop_nh->nh_power; |
| 1148 | nexthop_nh->nh_power = 0; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1149 | spin_unlock_bh(&fib_multipath_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | #endif |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1151 | dead++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1153 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1154 | if (force > 1 && nexthop_nh->nh_dev == dev) { |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1155 | dead = fi->fib_nhs; |
| 1156 | break; |
| 1157 | } |
| 1158 | #endif |
| 1159 | } endfor_nexthops(fi) |
| 1160 | if (dead == fi->fib_nhs) { |
| 1161 | fi->fib_flags |= RTNH_F_DEAD; |
| 1162 | ret++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | return ret; |
| 1167 | } |
| 1168 | |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1169 | /* Must be invoked inside of an RCU protected region. */ |
| 1170 | void fib_select_default(struct fib_result *res) |
| 1171 | { |
| 1172 | struct fib_info *fi = NULL, *last_resort = NULL; |
| 1173 | struct list_head *fa_head = res->fa_head; |
| 1174 | struct fib_table *tb = res->table; |
| 1175 | int order = -1, last_idx = -1; |
| 1176 | struct fib_alias *fa; |
| 1177 | |
| 1178 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
| 1179 | struct fib_info *next_fi = fa->fa_info; |
| 1180 | |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 1181 | if (next_fi->fib_scope != res->scope || |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1182 | fa->fa_type != RTN_UNICAST) |
| 1183 | continue; |
| 1184 | |
| 1185 | if (next_fi->fib_priority > res->fi->fib_priority) |
| 1186 | break; |
| 1187 | if (!next_fi->fib_nh[0].nh_gw || |
| 1188 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) |
| 1189 | continue; |
| 1190 | |
| 1191 | fib_alias_accessed(fa); |
| 1192 | |
| 1193 | if (fi == NULL) { |
| 1194 | if (next_fi != res->fi) |
| 1195 | break; |
| 1196 | } else if (!fib_detect_death(fi, order, &last_resort, |
| 1197 | &last_idx, tb->tb_default)) { |
| 1198 | fib_result_assign(res, fi); |
| 1199 | tb->tb_default = order; |
| 1200 | goto out; |
| 1201 | } |
| 1202 | fi = next_fi; |
| 1203 | order++; |
| 1204 | } |
| 1205 | |
| 1206 | if (order <= 0 || fi == NULL) { |
| 1207 | tb->tb_default = -1; |
| 1208 | goto out; |
| 1209 | } |
| 1210 | |
| 1211 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
| 1212 | tb->tb_default)) { |
| 1213 | fib_result_assign(res, fi); |
| 1214 | tb->tb_default = order; |
| 1215 | goto out; |
| 1216 | } |
| 1217 | |
| 1218 | if (last_idx >= 0) |
| 1219 | fib_result_assign(res, last_resort); |
| 1220 | tb->tb_default = last_idx; |
| 1221 | out: |
Eric Dumazet | 31d4093 | 2011-02-14 11:23:04 -0800 | [diff] [blame] | 1222 | return; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1223 | } |
| 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 1226 | |
| 1227 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1228 | * Dead device goes up. We wake up dead nexthops. |
| 1229 | * It takes sense only on multipath routes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | int fib_sync_up(struct net_device *dev) |
| 1232 | { |
| 1233 | struct fib_info *prev_fi; |
| 1234 | unsigned int hash; |
| 1235 | struct hlist_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | struct fib_nh *nh; |
| 1237 | int ret; |
| 1238 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1239 | if (!(dev->flags & IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | return 0; |
| 1241 | |
| 1242 | prev_fi = NULL; |
| 1243 | hash = fib_devindex_hashfn(dev->ifindex); |
| 1244 | head = &fib_info_devhash[hash]; |
| 1245 | ret = 0; |
| 1246 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1247 | hlist_for_each_entry(nh, head, nh_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | struct fib_info *fi = nh->nh_parent; |
| 1249 | int alive; |
| 1250 | |
| 1251 | BUG_ON(!fi->fib_nhs); |
| 1252 | if (nh->nh_dev != dev || fi == prev_fi) |
| 1253 | continue; |
| 1254 | |
| 1255 | prev_fi = fi; |
| 1256 | alive = 0; |
| 1257 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1258 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | alive++; |
| 1260 | continue; |
| 1261 | } |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1262 | if (nexthop_nh->nh_dev == NULL || |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1263 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | continue; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1265 | if (nexthop_nh->nh_dev != dev || |
| 1266 | !__in_dev_get_rtnl(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | continue; |
| 1268 | alive++; |
| 1269 | spin_lock_bh(&fib_multipath_lock); |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1270 | nexthop_nh->nh_power = 0; |
| 1271 | nexthop_nh->nh_flags &= ~RTNH_F_DEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | spin_unlock_bh(&fib_multipath_lock); |
| 1273 | } endfor_nexthops(fi) |
| 1274 | |
| 1275 | if (alive > 0) { |
| 1276 | fi->fib_flags &= ~RTNH_F_DEAD; |
| 1277 | ret++; |
| 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | return ret; |
| 1282 | } |
| 1283 | |
| 1284 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1285 | * The algorithm is suboptimal, but it provides really |
| 1286 | * fair weighted route distribution. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | */ |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 1288 | void fib_select_multipath(struct fib_result *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | { |
| 1290 | struct fib_info *fi = res->fi; |
| 1291 | int w; |
| 1292 | |
| 1293 | spin_lock_bh(&fib_multipath_lock); |
| 1294 | if (fi->fib_power <= 0) { |
| 1295 | int power = 0; |
| 1296 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1297 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) { |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1298 | power += nexthop_nh->nh_weight; |
| 1299 | nexthop_nh->nh_power = nexthop_nh->nh_weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | } |
| 1301 | } endfor_nexthops(fi); |
| 1302 | fi->fib_power = power; |
| 1303 | if (power <= 0) { |
| 1304 | spin_unlock_bh(&fib_multipath_lock); |
| 1305 | /* Race condition: route has just become dead. */ |
| 1306 | res->nh_sel = 0; |
| 1307 | return; |
| 1308 | } |
| 1309 | } |
| 1310 | |
| 1311 | |
| 1312 | /* w should be random number [0..fi->fib_power-1], |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1313 | * it is pretty bad approximation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | */ |
| 1315 | |
| 1316 | w = jiffies % fi->fib_power; |
| 1317 | |
| 1318 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1319 | if (!(nexthop_nh->nh_flags & RTNH_F_DEAD) && |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1320 | nexthop_nh->nh_power) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1321 | w -= nexthop_nh->nh_power; |
| 1322 | if (w <= 0) { |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1323 | nexthop_nh->nh_power--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | fi->fib_power--; |
| 1325 | res->nh_sel = nhsel; |
| 1326 | spin_unlock_bh(&fib_multipath_lock); |
| 1327 | return; |
| 1328 | } |
| 1329 | } |
| 1330 | } endfor_nexthops(fi); |
| 1331 | |
| 1332 | /* Race condition: route has just become dead. */ |
| 1333 | res->nh_sel = 0; |
| 1334 | spin_unlock_bh(&fib_multipath_lock); |
| 1335 | } |
| 1336 | #endif |