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> |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 45 | #include <net/lwtunnel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #include "fib_lookup.h" |
| 48 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 49 | static DEFINE_SPINLOCK(fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | static struct hlist_head *fib_info_hash; |
| 51 | static struct hlist_head *fib_info_laddrhash; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 52 | static unsigned int fib_info_hash_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | static unsigned int fib_info_cnt; |
| 54 | |
| 55 | #define DEVINDEX_HASHBITS 8 |
| 56 | #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) |
| 57 | static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE]; |
| 58 | |
| 59 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 60 | u32 fib_multipath_secret __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 207 | struct dst_metrics *m; |
Yan, Zheng | 19c1ea1 | 2011-09-04 20:24:20 +0000 | [diff] [blame] | 208 | |
Yanmin Zhang | e49cc0d | 2012-05-23 15:39:45 +0000 | [diff] [blame] | 209 | change_nexthops(fi) { |
| 210 | if (nexthop_nh->nh_dev) |
| 211 | dev_put(nexthop_nh->nh_dev); |
Nicolas Dichtel | 5a6228a | 2015-07-24 12:28:36 +0200 | [diff] [blame] | 212 | lwtstate_put(nexthop_nh->nh_lwtstate); |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 213 | free_nh_exceptions(nexthop_nh); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 214 | rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output); |
| 215 | rt_fibinfo_free(&nexthop_nh->nh_rth_input); |
Yanmin Zhang | e49cc0d | 2012-05-23 15:39:45 +0000 | [diff] [blame] | 216 | } endfor_nexthops(fi); |
| 217 | |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 218 | m = fi->fib_metrics; |
| 219 | if (m != &dst_default_metrics && atomic_dec_and_test(&m->refcnt)) |
| 220 | kfree(m); |
Yan, Zheng | 19c1ea1 | 2011-09-04 20:24:20 +0000 | [diff] [blame] | 221 | kfree(fi); |
| 222 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | void free_fib_info(struct fib_info *fi) |
| 225 | { |
| 226 | if (fi->fib_dead == 0) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 227 | pr_warn("Freeing alive fib_info %p\n", fi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return; |
| 229 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | fib_info_cnt--; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 231 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 232 | change_nexthops(fi) { |
| 233 | if (nexthop_nh->nh_tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 234 | fi->fib_net->ipv4.fib_num_tclassid_users--; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 235 | } endfor_nexthops(fi); |
| 236 | #endif |
Yan, Zheng | 19c1ea1 | 2011-09-04 20:24:20 +0000 | [diff] [blame] | 237 | call_rcu(&fi->rcu, free_fib_info_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | void fib_release_info(struct fib_info *fi) |
| 241 | { |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 242 | spin_lock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | if (fi && --fi->fib_treeref == 0) { |
| 244 | hlist_del(&fi->fib_hash); |
| 245 | if (fi->fib_prefsrc) |
| 246 | hlist_del(&fi->fib_lhash); |
| 247 | change_nexthops(fi) { |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 248 | if (!nexthop_nh->nh_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | continue; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 250 | hlist_del(&nexthop_nh->nh_hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } endfor_nexthops(fi) |
| 252 | fi->fib_dead = 1; |
| 253 | fib_info_put(fi); |
| 254 | } |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 255 | spin_unlock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 258 | 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] | 259 | { |
| 260 | const struct fib_nh *onh = ofi->fib_nh; |
| 261 | |
| 262 | for_nexthops(fi) { |
| 263 | if (nh->nh_oif != onh->nh_oif || |
| 264 | nh->nh_gw != onh->nh_gw || |
| 265 | nh->nh_scope != onh->nh_scope || |
| 266 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 267 | nh->nh_weight != onh->nh_weight || |
| 268 | #endif |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 269 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | nh->nh_tclassid != onh->nh_tclassid || |
| 271 | #endif |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 272 | lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) || |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 273 | ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | return -1; |
| 275 | onh++; |
| 276 | } endfor_nexthops(fi); |
| 277 | return 0; |
| 278 | } |
| 279 | |
David S. Miller | 88ebc72 | 2008-01-12 21:49:01 -0800 | [diff] [blame] | 280 | static inline unsigned int fib_devindex_hashfn(unsigned int val) |
| 281 | { |
| 282 | unsigned int mask = DEVINDEX_HASHSIZE - 1; |
| 283 | |
| 284 | return (val ^ |
| 285 | (val >> DEVINDEX_HASHBITS) ^ |
| 286 | (val >> (DEVINDEX_HASHBITS * 2))) & mask; |
| 287 | } |
| 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | static inline unsigned int fib_info_hashfn(const struct fib_info *fi) |
| 290 | { |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 291 | unsigned int mask = (fib_info_hash_size - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | unsigned int val = fi->fib_nhs; |
| 293 | |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 294 | val ^= (fi->fib_protocol << 8) | fi->fib_scope; |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 295 | val ^= (__force u32)fi->fib_prefsrc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | val ^= fi->fib_priority; |
David S. Miller | 88ebc72 | 2008-01-12 21:49:01 -0800 | [diff] [blame] | 297 | for_nexthops(fi) { |
| 298 | val ^= fib_devindex_hashfn(nh->nh_oif); |
| 299 | } endfor_nexthops(fi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | return (val ^ (val >> 7) ^ (val >> 12)) & mask; |
| 302 | } |
| 303 | |
| 304 | static struct fib_info *fib_find_info(const struct fib_info *nfi) |
| 305 | { |
| 306 | struct hlist_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | struct fib_info *fi; |
| 308 | unsigned int hash; |
| 309 | |
| 310 | hash = fib_info_hashfn(nfi); |
| 311 | head = &fib_info_hash[hash]; |
| 312 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 313 | hlist_for_each_entry(fi, head, fib_hash) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 314 | if (!net_eq(fi->fib_net, nfi->fib_net)) |
Denis V. Lunev | 4814bdb | 2008-01-31 18:50:07 -0800 | [diff] [blame] | 315 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | if (fi->fib_nhs != nfi->fib_nhs) |
| 317 | continue; |
| 318 | if (nfi->fib_protocol == fi->fib_protocol && |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 319 | nfi->fib_scope == fi->fib_scope && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | nfi->fib_prefsrc == fi->fib_prefsrc && |
| 321 | nfi->fib_priority == fi->fib_priority && |
Eric Dumazet | f4ef85b | 2012-10-04 01:25:26 +0000 | [diff] [blame] | 322 | nfi->fib_type == fi->fib_type && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | memcmp(nfi->fib_metrics, fi->fib_metrics, |
Eric Dumazet | fcd13f4 | 2011-03-24 07:01:24 +0000 | [diff] [blame] | 324 | sizeof(u32) * RTAX_MAX) == 0 && |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 325 | !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0)) |
| 327 | return fi; |
| 328 | } |
| 329 | |
| 330 | return NULL; |
| 331 | } |
| 332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* Check, that the gateway is already configured. |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 334 | * Used only by redirect accept routine. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | */ |
Al Viro | d878e72e | 2006-09-26 22:18:13 -0700 | [diff] [blame] | 336 | int ip_fib_check_default(__be32 gw, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
| 338 | struct hlist_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | struct fib_nh *nh; |
| 340 | unsigned int hash; |
| 341 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 342 | spin_lock(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | hash = fib_devindex_hashfn(dev->ifindex); |
| 345 | head = &fib_info_devhash[hash]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 346 | hlist_for_each_entry(nh, head, nh_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | if (nh->nh_dev == dev && |
| 348 | nh->nh_gw == gw && |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 349 | !(nh->nh_flags & RTNH_F_DEAD)) { |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 350 | spin_unlock(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | return 0; |
| 352 | } |
| 353 | } |
| 354 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 355 | spin_unlock(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | return -1; |
| 358 | } |
| 359 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 360 | static inline size_t fib_nlmsg_size(struct fib_info *fi) |
| 361 | { |
| 362 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
| 363 | + nla_total_size(4) /* RTA_TABLE */ |
| 364 | + nla_total_size(4) /* RTA_DST */ |
| 365 | + nla_total_size(4) /* RTA_PRIORITY */ |
Daniel Borkmann | ea69763 | 2015-01-05 23:57:47 +0100 | [diff] [blame] | 366 | + nla_total_size(4) /* RTA_PREFSRC */ |
| 367 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 368 | |
| 369 | /* space for nested metrics */ |
| 370 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); |
| 371 | |
| 372 | if (fi->fib_nhs) { |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 373 | size_t nh_encapsize = 0; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 374 | /* Also handles the special case fib_nhs == 1 */ |
| 375 | |
| 376 | /* each nexthop is packed in an attribute */ |
| 377 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); |
| 378 | |
| 379 | /* may contain flow and gateway attribute */ |
| 380 | nhsize += 2 * nla_total_size(4); |
| 381 | |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 382 | /* grab encap info */ |
| 383 | for_nexthops(fi) { |
| 384 | if (nh->nh_lwtstate) { |
| 385 | /* RTA_ENCAP_TYPE */ |
| 386 | nh_encapsize += lwtunnel_get_encap_size( |
| 387 | nh->nh_lwtstate); |
| 388 | /* RTA_ENCAP */ |
| 389 | nh_encapsize += nla_total_size(2); |
| 390 | } |
| 391 | } endfor_nexthops(fi); |
| 392 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 393 | /* all nexthops are packed in a nested attribute */ |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 394 | payload += nla_total_size((fi->fib_nhs * nhsize) + |
| 395 | nh_encapsize); |
| 396 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | return payload; |
| 400 | } |
| 401 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 402 | void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, |
Joe Perches | 9877b25 | 2013-10-17 13:34:11 -0700 | [diff] [blame] | 403 | int dst_len, u32 tb_id, const struct nl_info *info, |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 404 | unsigned int nlm_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | { |
| 406 | struct sk_buff *skb; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 407 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 408 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 410 | skb = nlmsg_new(fib_nlmsg_size(fa->fa_info), GFP_KERNEL); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 411 | if (!skb) |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 412 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 414 | err = fib_dump_info(skb, info->portid, seq, event, tb_id, |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 415 | fa->fa_type, key, dst_len, |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 416 | fa->fa_tos, fa->fa_info, nlm_flags); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 417 | if (err < 0) { |
| 418 | /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ |
| 419 | WARN_ON(err == -EMSGSIZE); |
| 420 | kfree_skb(skb); |
| 421 | goto errout; |
| 422 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 423 | rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV4_ROUTE, |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 424 | info->nlh, GFP_KERNEL); |
| 425 | return; |
Thomas Graf | f21c7bc | 2006-08-15 00:34:17 -0700 | [diff] [blame] | 426 | errout: |
| 427 | if (err < 0) |
Denis V. Lunev | 4d1169c | 2008-01-10 03:26:13 -0800 | [diff] [blame] | 428 | rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Julian Anastasov | 88f6432 | 2015-07-23 10:39:35 +0300 | [diff] [blame] | 442 | } else { |
| 443 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
Jianjun Kong | d9319100 | 2008-11-03 00:23:42 -0800 | [diff] [blame] | 445 | if (state == NUD_REACHABLE) |
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) && order != dflt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | return 0; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 449 | if ((state & NUD_VALID) || |
Julian Anastasov | 88f6432 | 2015-07-23 10:39:35 +0300 | [diff] [blame] | 450 | (*last_idx < 0 && order > dflt && state != NUD_INCOMPLETE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | *last_resort = fi; |
| 452 | *last_idx = order; |
| 453 | } |
| 454 | return 1; |
| 455 | } |
| 456 | |
| 457 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 458 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 459 | static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | { |
| 461 | int nhs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 463 | while (rtnh_ok(rtnh, remaining)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | nhs++; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 465 | rtnh = rtnh_next(rtnh, &remaining); |
| 466 | } |
| 467 | |
| 468 | /* leftover implies invalid nexthop configuration, discard it */ |
| 469 | return remaining > 0 ? 0 : nhs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 472 | static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, |
| 473 | int remaining, struct fib_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | { |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 475 | struct net *net = cfg->fc_nlinfo.nl_net; |
| 476 | int ret; |
| 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | change_nexthops(fi) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 479 | int attrlen; |
| 480 | |
| 481 | if (!rtnh_ok(rtnh, remaining)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | return -EINVAL; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 483 | |
Julian Anastasov | 8061022 | 2016-07-10 21:11:55 +0300 | [diff] [blame] | 484 | if (rtnh->rtnh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
| 485 | return -EINVAL; |
| 486 | |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 487 | nexthop_nh->nh_flags = |
| 488 | (cfg->fc_flags & ~0xFF) | rtnh->rtnh_flags; |
| 489 | nexthop_nh->nh_oif = rtnh->rtnh_ifindex; |
| 490 | nexthop_nh->nh_weight = rtnh->rtnh_hops + 1; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 491 | |
| 492 | attrlen = rtnh_attrlen(rtnh); |
| 493 | if (attrlen > 0) { |
| 494 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
| 495 | |
| 496 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 497 | nexthop_nh->nh_gw = nla ? nla_get_in_addr(nla) : 0; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 498 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 499 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 500 | nexthop_nh->nh_tclassid = nla ? nla_get_u32(nla) : 0; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 501 | if (nexthop_nh->nh_tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 502 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | #endif |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 504 | nla = nla_find(attrs, attrlen, RTA_ENCAP); |
| 505 | if (nla) { |
| 506 | struct lwtunnel_state *lwtstate; |
| 507 | struct net_device *dev = NULL; |
| 508 | struct nlattr *nla_entype; |
| 509 | |
| 510 | nla_entype = nla_find(attrs, attrlen, |
| 511 | RTA_ENCAP_TYPE); |
| 512 | if (!nla_entype) |
| 513 | goto err_inval; |
| 514 | if (cfg->fc_oif) |
| 515 | dev = __dev_get_by_index(net, cfg->fc_oif); |
| 516 | ret = lwtunnel_build_state(dev, nla_get_u16( |
| 517 | nla_entype), |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 518 | nla, AF_INET, cfg, |
| 519 | &lwtstate); |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 520 | if (ret) |
| 521 | goto errout; |
Nicolas Dichtel | 5a6228a | 2015-07-24 12:28:36 +0200 | [diff] [blame] | 522 | nexthop_nh->nh_lwtstate = |
| 523 | lwtstate_get(lwtstate); |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 526 | |
| 527 | rtnh = rtnh_next(rtnh, &remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } endfor_nexthops(fi); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | return 0; |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 531 | |
| 532 | err_inval: |
| 533 | ret = -EINVAL; |
| 534 | |
| 535 | errout: |
| 536 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | } |
| 538 | |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 539 | static void fib_rebalance(struct fib_info *fi) |
| 540 | { |
| 541 | int total; |
| 542 | int w; |
| 543 | struct in_device *in_dev; |
| 544 | |
| 545 | if (fi->fib_nhs < 2) |
| 546 | return; |
| 547 | |
| 548 | total = 0; |
| 549 | for_nexthops(fi) { |
| 550 | if (nh->nh_flags & RTNH_F_DEAD) |
| 551 | continue; |
| 552 | |
David Ahern | 51161aa | 2015-10-14 16:44:00 -0700 | [diff] [blame] | 553 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 554 | |
| 555 | if (in_dev && |
| 556 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && |
| 557 | nh->nh_flags & RTNH_F_LINKDOWN) |
| 558 | continue; |
| 559 | |
| 560 | total += nh->nh_weight; |
| 561 | } endfor_nexthops(fi); |
| 562 | |
| 563 | w = 0; |
| 564 | change_nexthops(fi) { |
| 565 | int upper_bound; |
| 566 | |
David Ahern | 51161aa | 2015-10-14 16:44:00 -0700 | [diff] [blame] | 567 | in_dev = __in_dev_get_rtnl(nexthop_nh->nh_dev); |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 568 | |
| 569 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) { |
| 570 | upper_bound = -1; |
| 571 | } else if (in_dev && |
| 572 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) && |
| 573 | nexthop_nh->nh_flags & RTNH_F_LINKDOWN) { |
| 574 | upper_bound = -1; |
| 575 | } else { |
| 576 | w += nexthop_nh->nh_weight; |
Peter Nørlund | 0a837fe | 2015-10-06 07:24:47 +0200 | [diff] [blame] | 577 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, |
| 578 | total) - 1; |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | atomic_set(&nexthop_nh->nh_upper_bound, upper_bound); |
| 582 | } endfor_nexthops(fi); |
| 583 | |
| 584 | net_get_random_once(&fib_multipath_secret, |
| 585 | sizeof(fib_multipath_secret)); |
| 586 | } |
| 587 | |
| 588 | static inline void fib_add_weight(struct fib_info *fi, |
| 589 | const struct fib_nh *nh) |
| 590 | { |
| 591 | fi->fib_weight += nh->nh_weight; |
| 592 | } |
| 593 | |
| 594 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 595 | |
| 596 | #define fib_rebalance(fi) do { } while (0) |
| 597 | #define fib_add_weight(fi, nh) do { } while (0) |
| 598 | |
| 599 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Ying Xue | e01286e | 2015-08-19 16:04:51 +0800 | [diff] [blame] | 601 | static int fib_encap_match(struct net *net, u16 encap_type, |
| 602 | struct nlattr *encap, |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 603 | int oif, const struct fib_nh *nh, |
| 604 | const struct fib_config *cfg) |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 605 | { |
| 606 | struct lwtunnel_state *lwtstate; |
| 607 | struct net_device *dev = NULL; |
Jiri Benc | df383e6 | 2015-08-18 18:41:13 +0200 | [diff] [blame] | 608 | int ret, result = 0; |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 609 | |
| 610 | if (encap_type == LWTUNNEL_ENCAP_NONE) |
| 611 | return 0; |
| 612 | |
| 613 | if (oif) |
| 614 | dev = __dev_get_by_index(net, oif); |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 615 | ret = lwtunnel_build_state(dev, encap_type, encap, |
| 616 | AF_INET, cfg, &lwtstate); |
Jiri Benc | df383e6 | 2015-08-18 18:41:13 +0200 | [diff] [blame] | 617 | if (!ret) { |
| 618 | result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate); |
| 619 | lwtstate_free(lwtstate); |
| 620 | } |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 621 | |
Jiri Benc | df383e6 | 2015-08-18 18:41:13 +0200 | [diff] [blame] | 622 | return result; |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 623 | } |
| 624 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 625 | int fib_nh_match(struct fib_config *cfg, struct fib_info *fi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | { |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 627 | struct net *net = cfg->fc_nlinfo.nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 629 | struct rtnexthop *rtnh; |
| 630 | int remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | #endif |
| 632 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 633 | if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | return 1; |
| 635 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 636 | if (cfg->fc_oif || cfg->fc_gw) { |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 637 | if (cfg->fc_encap) { |
| 638 | if (fib_encap_match(net, cfg->fc_encap_type, |
| 639 | cfg->fc_encap, cfg->fc_oif, |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 640 | fi->fib_nh, cfg)) |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 641 | return 1; |
| 642 | } |
Stefano Brivio | def37b7 | 2018-02-15 09:46:03 +0100 | [diff] [blame] | 643 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 644 | if (cfg->fc_flow && |
| 645 | cfg->fc_flow != fi->fib_nh->nh_tclassid) |
| 646 | return 1; |
| 647 | #endif |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 648 | if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) && |
| 649 | (!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | return 0; |
| 651 | return 1; |
| 652 | } |
| 653 | |
| 654 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 655 | if (!cfg->fc_mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | return 0; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 657 | |
| 658 | rtnh = cfg->fc_mp; |
| 659 | remaining = cfg->fc_mp_len; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | for_nexthops(fi) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 662 | int attrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 664 | if (!rtnh_ok(rtnh, remaining)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return -EINVAL; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 666 | |
| 667 | if (rtnh->rtnh_ifindex && rtnh->rtnh_ifindex != nh->nh_oif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | return 1; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 669 | |
| 670 | attrlen = rtnh_attrlen(rtnh); |
Jiri Pirko | f76936d | 2014-10-13 16:34:10 +0200 | [diff] [blame] | 671 | if (attrlen > 0) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 672 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
| 673 | |
| 674 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 675 | if (nla && nla_get_in_addr(nla) != nh->nh_gw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | return 1; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 677 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 678 | nla = nla_find(attrs, attrlen, RTA_FLOW); |
| 679 | if (nla && nla_get_u32(nla) != nh->nh_tclassid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | return 1; |
| 681 | #endif |
| 682 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 683 | |
| 684 | rtnh = rtnh_next(rtnh, &remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } endfor_nexthops(fi); |
| 686 | #endif |
| 687 | return 0; |
| 688 | } |
| 689 | |
| 690 | |
| 691 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 692 | * Picture |
| 693 | * ------- |
| 694 | * |
| 695 | * Semantics of nexthop is very messy by historical reasons. |
| 696 | * We have to take into account, that: |
| 697 | * a) gateway can be actually local interface address, |
| 698 | * so that gatewayed route is direct. |
| 699 | * b) gateway must be on-link address, possibly |
| 700 | * described not by an ifaddr, but also by a direct route. |
| 701 | * c) If both gateway and interface are specified, they should not |
| 702 | * contradict. |
| 703 | * d) If we use tunnel routes, gateway could be not on-link. |
| 704 | * |
| 705 | * Attempt to reconcile all of these (alas, self-contradictory) conditions |
| 706 | * results in pretty ugly and hairy code with obscure logic. |
| 707 | * |
| 708 | * I chose to generalized it instead, so that the size |
| 709 | * of code does not increase practically, but it becomes |
| 710 | * much more general. |
| 711 | * Every prefix is assigned a "scope" value: "host" is local address, |
| 712 | * "link" is direct route, |
| 713 | * [ ... "site" ... "interior" ... ] |
| 714 | * and "universe" is true gateway route with global meaning. |
| 715 | * |
| 716 | * Every prefix refers to a set of "nexthop"s (gw, oif), |
| 717 | * where gw must have narrower scope. This recursion stops |
| 718 | * when gw has LOCAL scope or if "nexthop" is declared ONLINK, |
| 719 | * which means that gw is forced to be on link. |
| 720 | * |
| 721 | * Code is still hairy, but now it is apparently logically |
| 722 | * consistent and very flexible. F.e. as by-product it allows |
| 723 | * to co-exists in peace independent exterior and interior |
| 724 | * routing processes. |
| 725 | * |
| 726 | * Normally it looks as following. |
| 727 | * |
| 728 | * {universe prefix} -> (gw, oif) [scope link] |
| 729 | * | |
| 730 | * |-> {link prefix} -> (gw, oif) [scope local] |
| 731 | * | |
| 732 | * |-> {local prefix} (terminal node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 734 | static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, |
| 735 | struct fib_nh *nh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 737 | int err = 0; |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 738 | struct net *net; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 739 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 741 | net = cfg->fc_nlinfo.nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | if (nh->nh_gw) { |
| 743 | struct fib_result res; |
| 744 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 745 | if (nh->nh_flags & RTNH_F_ONLINK) { |
David Ahern | 30bbaa1 | 2015-08-13 14:59:05 -0600 | [diff] [blame] | 746 | unsigned int addr_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 748 | if (cfg->fc_scope >= RT_SCOPE_LINK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | return -EINVAL; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 750 | dev = __dev_get_by_index(net, nh->nh_oif); |
| 751 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | return -ENODEV; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 753 | if (!(dev->flags & IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | return -ENETDOWN; |
David Ahern | 30bbaa1 | 2015-08-13 14:59:05 -0600 | [diff] [blame] | 755 | addr_type = inet_addr_type_dev_table(net, dev, nh->nh_gw); |
| 756 | if (addr_type != RTN_UNICAST) |
| 757 | return -EINVAL; |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 758 | if (!netif_carrier_ok(dev)) |
| 759 | nh->nh_flags |= RTNH_F_LINKDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | nh->nh_dev = dev; |
| 761 | dev_hold(dev); |
| 762 | nh->nh_scope = RT_SCOPE_LINK; |
| 763 | return 0; |
| 764 | } |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 765 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
David Ahern | 3bfd847 | 2015-08-13 14:59:07 -0600 | [diff] [blame] | 767 | struct fib_table *tbl = NULL; |
David S. Miller | 9ade228 | 2011-03-12 02:02:42 -0500 | [diff] [blame] | 768 | struct flowi4 fl4 = { |
| 769 | .daddr = nh->nh_gw, |
| 770 | .flowi4_scope = cfg->fc_scope + 1, |
| 771 | .flowi4_oif = nh->nh_oif, |
Cong Wang | 6a66271 | 2014-04-15 16:25:34 -0700 | [diff] [blame] | 772 | .flowi4_iif = LOOPBACK_IFINDEX, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 773 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | /* It is not necessary, but requires a bit of thinking */ |
David S. Miller | 9ade228 | 2011-03-12 02:02:42 -0500 | [diff] [blame] | 776 | if (fl4.flowi4_scope < RT_SCOPE_LINK) |
| 777 | fl4.flowi4_scope = RT_SCOPE_LINK; |
David Ahern | 3bfd847 | 2015-08-13 14:59:07 -0600 | [diff] [blame] | 778 | |
| 779 | if (cfg->fc_table) |
| 780 | tbl = fib_get_table(net, cfg->fc_table); |
| 781 | |
| 782 | if (tbl) |
| 783 | err = fib_table_lookup(tbl, &fl4, &res, |
Eric Dumazet | 1e31367 | 2015-08-15 10:54:07 -0700 | [diff] [blame] | 784 | FIB_LOOKUP_IGNORE_LINKSTATE | |
| 785 | FIB_LOOKUP_NOREF); |
David Ahern | 4c9bcd1 | 2015-08-19 11:40:31 -0700 | [diff] [blame] | 786 | |
| 787 | /* on error or if no table given do full lookup. This |
| 788 | * is needed for example when nexthops are in the local |
| 789 | * table rather than the given table |
| 790 | */ |
| 791 | if (!tbl || err) { |
David Ahern | 3bfd847 | 2015-08-13 14:59:07 -0600 | [diff] [blame] | 792 | err = fib_lookup(net, &fl4, &res, |
| 793 | FIB_LOOKUP_IGNORE_LINKSTATE); |
David Ahern | 4c9bcd1 | 2015-08-19 11:40:31 -0700 | [diff] [blame] | 794 | } |
| 795 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 796 | if (err) { |
| 797 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return err; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 799 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | } |
| 801 | err = -EINVAL; |
| 802 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) |
| 803 | goto out; |
| 804 | nh->nh_scope = res.scope; |
| 805 | nh->nh_oif = FIB_RES_OIF(res); |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 806 | nh->nh_dev = dev = FIB_RES_DEV(res); |
| 807 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | goto out; |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 809 | dev_hold(dev); |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 810 | if (!netif_carrier_ok(dev)) |
| 811 | nh->nh_flags |= RTNH_F_LINKDOWN; |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 812 | err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } else { |
| 814 | struct in_device *in_dev; |
| 815 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 816 | if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | return -EINVAL; |
| 818 | |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 819 | rcu_read_lock(); |
| 820 | err = -ENODEV; |
Denis V. Lunev | 86167a3 | 2008-01-21 17:34:00 -0800 | [diff] [blame] | 821 | in_dev = inetdev_by_index(net, nh->nh_oif); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 822 | if (!in_dev) |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 823 | goto out; |
| 824 | err = -ENETDOWN; |
| 825 | if (!(in_dev->dev->flags & IFF_UP)) |
| 826 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | nh->nh_dev = in_dev->dev; |
| 828 | dev_hold(nh->nh_dev); |
| 829 | nh->nh_scope = RT_SCOPE_HOST; |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 830 | if (!netif_carrier_ok(nh->nh_dev)) |
| 831 | nh->nh_flags |= RTNH_F_LINKDOWN; |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 832 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 834 | out: |
| 835 | rcu_read_unlock(); |
| 836 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 839 | static inline unsigned int fib_laddr_hashfn(__be32 val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | { |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 841 | unsigned int mask = (fib_info_hash_size - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 843 | return ((__force u32)val ^ |
| 844 | ((__force u32)val >> 7) ^ |
| 845 | ((__force u32)val >> 14)) & mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 848 | static struct hlist_head *fib_info_hash_alloc(int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | { |
| 850 | if (bytes <= PAGE_SIZE) |
Joonwoo Park | 88f8349 | 2007-11-26 23:29:32 +0800 | [diff] [blame] | 851 | return kzalloc(bytes, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | else |
| 853 | return (struct hlist_head *) |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 854 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
| 855 | get_order(bytes)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 858 | static void fib_info_hash_free(struct hlist_head *hash, int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
| 860 | if (!hash) |
| 861 | return; |
| 862 | |
| 863 | if (bytes <= PAGE_SIZE) |
| 864 | kfree(hash); |
| 865 | else |
| 866 | free_pages((unsigned long) hash, get_order(bytes)); |
| 867 | } |
| 868 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 869 | static void fib_info_hash_move(struct hlist_head *new_info_hash, |
| 870 | struct hlist_head *new_laddrhash, |
| 871 | unsigned int new_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | { |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 873 | struct hlist_head *old_info_hash, *old_laddrhash; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 874 | unsigned int old_size = fib_info_hash_size; |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 875 | unsigned int i, bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 877 | spin_lock_bh(&fib_info_lock); |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 878 | old_info_hash = fib_info_hash; |
| 879 | old_laddrhash = fib_info_laddrhash; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 880 | fib_info_hash_size = new_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | for (i = 0; i < old_size; i++) { |
| 883 | struct hlist_head *head = &fib_info_hash[i]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 884 | struct hlist_node *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | struct fib_info *fi; |
| 886 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 887 | hlist_for_each_entry_safe(fi, n, head, fib_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | struct hlist_head *dest; |
| 889 | unsigned int new_hash; |
| 890 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | new_hash = fib_info_hashfn(fi); |
| 892 | dest = &new_info_hash[new_hash]; |
| 893 | hlist_add_head(&fi->fib_hash, dest); |
| 894 | } |
| 895 | } |
| 896 | fib_info_hash = new_info_hash; |
| 897 | |
| 898 | for (i = 0; i < old_size; i++) { |
| 899 | struct hlist_head *lhead = &fib_info_laddrhash[i]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 900 | struct hlist_node *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | struct fib_info *fi; |
| 902 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 903 | hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | struct hlist_head *ldest; |
| 905 | unsigned int new_hash; |
| 906 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | new_hash = fib_laddr_hashfn(fi->fib_prefsrc); |
| 908 | ldest = &new_laddrhash[new_hash]; |
| 909 | hlist_add_head(&fi->fib_lhash, ldest); |
| 910 | } |
| 911 | } |
| 912 | fib_info_laddrhash = new_laddrhash; |
| 913 | |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 914 | spin_unlock_bh(&fib_info_lock); |
David S. Miller | b7656e7 | 2005-08-05 04:12:48 -0700 | [diff] [blame] | 915 | |
| 916 | bytes = old_size * sizeof(struct hlist_head *); |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 917 | fib_info_hash_free(old_info_hash, bytes); |
| 918 | fib_info_hash_free(old_laddrhash, bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | } |
| 920 | |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 921 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) |
| 922 | { |
| 923 | nh->nh_saddr = inet_select_addr(nh->nh_dev, |
| 924 | nh->nh_gw, |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 925 | nh->nh_parent->fib_scope); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 926 | nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid); |
| 927 | |
| 928 | return nh->nh_saddr; |
| 929 | } |
| 930 | |
David Ahern | 021dd3b | 2015-08-13 14:59:06 -0600 | [diff] [blame] | 931 | static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc) |
| 932 | { |
| 933 | if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst || |
| 934 | fib_prefsrc != cfg->fc_dst) { |
David Ahern | 9b8ff51 | 2015-09-01 14:26:35 -0600 | [diff] [blame] | 935 | u32 tb_id = cfg->fc_table; |
David Ahern | e1b8d90 | 2015-11-03 15:59:28 -0800 | [diff] [blame] | 936 | int rc; |
David Ahern | 021dd3b | 2015-08-13 14:59:06 -0600 | [diff] [blame] | 937 | |
| 938 | if (tb_id == RT_TABLE_MAIN) |
| 939 | tb_id = RT_TABLE_LOCAL; |
| 940 | |
David Ahern | e1b8d90 | 2015-11-03 15:59:28 -0800 | [diff] [blame] | 941 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
| 942 | fib_prefsrc, tb_id); |
| 943 | |
| 944 | if (rc != RTN_LOCAL && tb_id != RT_TABLE_LOCAL) { |
| 945 | rc = inet_addr_type_table(cfg->fc_nlinfo.nl_net, |
| 946 | fib_prefsrc, RT_TABLE_LOCAL); |
David Ahern | 021dd3b | 2015-08-13 14:59:06 -0600 | [diff] [blame] | 947 | } |
David Ahern | e1b8d90 | 2015-11-03 15:59:28 -0800 | [diff] [blame] | 948 | |
| 949 | if (rc != RTN_LOCAL) |
| 950 | return false; |
David Ahern | 021dd3b | 2015-08-13 14:59:06 -0600 | [diff] [blame] | 951 | } |
| 952 | return true; |
| 953 | } |
| 954 | |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 955 | static int |
| 956 | fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) |
| 957 | { |
Daniel Borkmann | c3a8d94 | 2015-08-31 15:58:47 +0200 | [diff] [blame] | 958 | bool ecn_ca = false; |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 959 | struct nlattr *nla; |
| 960 | int remaining; |
| 961 | |
| 962 | if (!cfg->fc_mx) |
| 963 | return 0; |
| 964 | |
| 965 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { |
| 966 | int type = nla_type(nla); |
| 967 | u32 val; |
| 968 | |
| 969 | if (!type) |
| 970 | continue; |
| 971 | if (type > RTAX_MAX) |
| 972 | return -EINVAL; |
| 973 | |
| 974 | if (type == RTAX_CC_ALGO) { |
| 975 | char tmp[TCP_CA_NAME_MAX]; |
| 976 | |
| 977 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
Daniel Borkmann | c3a8d94 | 2015-08-31 15:58:47 +0200 | [diff] [blame] | 978 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 979 | if (val == TCP_CA_UNSPEC) |
| 980 | return -EINVAL; |
| 981 | } else { |
Eric Dumazet | 5300a1c | 2018-06-05 06:06:19 -0700 | [diff] [blame^] | 982 | if (nla_len(nla) != sizeof(u32)) |
| 983 | return false; |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 984 | val = nla_get_u32(nla); |
| 985 | } |
| 986 | if (type == RTAX_ADVMSS && val > 65535 - 40) |
| 987 | val = 65535 - 40; |
| 988 | if (type == RTAX_MTU && val > 65535 - 15) |
| 989 | val = 65535 - 15; |
Paolo Abeni | 626abd5 | 2016-05-13 18:33:41 +0200 | [diff] [blame] | 990 | if (type == RTAX_HOPLIMIT && val > 255) |
| 991 | val = 255; |
Daniel Borkmann | b8d3e41 | 2015-08-31 15:58:46 +0200 | [diff] [blame] | 992 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
| 993 | return -EINVAL; |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 994 | fi->fib_metrics->metrics[type - 1] = val; |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 995 | } |
| 996 | |
Daniel Borkmann | c3a8d94 | 2015-08-31 15:58:47 +0200 | [diff] [blame] | 997 | if (ecn_ca) |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 998 | fi->fib_metrics->metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; |
Daniel Borkmann | c3a8d94 | 2015-08-31 15:58:47 +0200 | [diff] [blame] | 999 | |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 1000 | return 0; |
| 1001 | } |
| 1002 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1003 | struct fib_info *fib_create_info(struct fib_config *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | { |
| 1005 | int err; |
| 1006 | struct fib_info *fi = NULL; |
| 1007 | struct fib_info *ofi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | int nhs = 1; |
Denis V. Lunev | 7462bd74 | 2008-01-31 18:49:32 -0800 | [diff] [blame] | 1009 | struct net *net = cfg->fc_nlinfo.nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
David S. Miller | 4c8237c | 2011-03-07 14:27:38 -0800 | [diff] [blame] | 1011 | if (cfg->fc_type > RTN_MAX) |
| 1012 | goto err_inval; |
| 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | /* Fast check to catch the most weird cases */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1015 | if (fib_props[cfg->fc_type].scope > cfg->fc_scope) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | goto err_inval; |
| 1017 | |
Julian Anastasov | 8061022 | 2016-07-10 21:11:55 +0300 | [diff] [blame] | 1018 | if (cfg->fc_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
| 1019 | goto err_inval; |
| 1020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1022 | if (cfg->fc_mp) { |
| 1023 | nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | if (nhs == 0) |
| 1025 | goto err_inval; |
| 1026 | } |
| 1027 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
| 1029 | err = -ENOBUFS; |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 1030 | if (fib_info_cnt >= fib_info_hash_size) { |
| 1031 | unsigned int new_size = fib_info_hash_size << 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | struct hlist_head *new_info_hash; |
| 1033 | struct hlist_head *new_laddrhash; |
| 1034 | unsigned int bytes; |
| 1035 | |
| 1036 | if (!new_size) |
Eric Dumazet | d94ce9b | 2012-10-21 20:12:09 +0000 | [diff] [blame] | 1037 | new_size = 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | bytes = new_size * sizeof(struct hlist_head *); |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 1039 | new_info_hash = fib_info_hash_alloc(bytes); |
| 1040 | new_laddrhash = fib_info_hash_alloc(bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | if (!new_info_hash || !new_laddrhash) { |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 1042 | fib_info_hash_free(new_info_hash, bytes); |
| 1043 | fib_info_hash_free(new_laddrhash, bytes); |
Joonwoo Park | 88f8349 | 2007-11-26 23:29:32 +0800 | [diff] [blame] | 1044 | } else |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 1045 | fib_info_hash_move(new_info_hash, new_laddrhash, new_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
David S. Miller | 123b973 | 2011-02-01 15:34:21 -0800 | [diff] [blame] | 1047 | if (!fib_info_hash_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | goto failure; |
| 1049 | } |
| 1050 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 1051 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1052 | if (!fi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | goto failure; |
David S. Miller | 725d1e1 | 2011-01-28 14:05:05 -0800 | [diff] [blame] | 1054 | if (cfg->fc_mx) { |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1055 | fi->fib_metrics = kzalloc(sizeof(*fi->fib_metrics), GFP_KERNEL); |
Eric Dumazet | 71501d9 | 2017-08-15 05:26:17 -0700 | [diff] [blame] | 1056 | if (unlikely(!fi->fib_metrics)) { |
| 1057 | kfree(fi); |
| 1058 | return ERR_PTR(err); |
| 1059 | } |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1060 | atomic_set(&fi->fib_metrics->refcnt, 1); |
Eric Dumazet | 71501d9 | 2017-08-15 05:26:17 -0700 | [diff] [blame] | 1061 | } else { |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1062 | fi->fib_metrics = (struct dst_metrics *)&dst_default_metrics; |
Eric Dumazet | 71501d9 | 2017-08-15 05:26:17 -0700 | [diff] [blame] | 1063 | } |
| 1064 | fib_info_cnt++; |
Eric W. Biederman | efd7ef1 | 2015-03-11 23:04:08 -0500 | [diff] [blame] | 1065 | fi->fib_net = net; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1066 | fi->fib_protocol = cfg->fc_protocol; |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 1067 | fi->fib_scope = cfg->fc_scope; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1068 | fi->fib_flags = cfg->fc_flags; |
| 1069 | fi->fib_priority = cfg->fc_priority; |
| 1070 | fi->fib_prefsrc = cfg->fc_prefsrc; |
Eric Dumazet | f4ef85b | 2012-10-04 01:25:26 +0000 | [diff] [blame] | 1071 | fi->fib_type = cfg->fc_type; |
Mark Tomlinson | 5a56a0b | 2016-09-05 10:20:20 +1200 | [diff] [blame] | 1072 | fi->fib_tb_id = cfg->fc_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
| 1074 | fi->fib_nhs = nhs; |
| 1075 | change_nexthops(fi) { |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1076 | nexthop_nh->nh_parent = fi; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1077 | nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *); |
Julian Anastasov | f8a1717 | 2012-10-08 11:41:17 +0000 | [diff] [blame] | 1078 | if (!nexthop_nh->nh_pcpu_rth_output) |
| 1079 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } endfor_nexthops(fi) |
| 1081 | |
Florian Westphal | 6cf9dfd | 2015-08-31 15:58:44 +0200 | [diff] [blame] | 1082 | err = fib_convert_metrics(fi, cfg); |
| 1083 | if (err) |
| 1084 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1086 | if (cfg->fc_mp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1088 | err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg); |
| 1089 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | goto failure; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1091 | if (cfg->fc_oif && fi->fib_nh->nh_oif != cfg->fc_oif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | goto err_inval; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1093 | if (cfg->fc_gw && fi->fib_nh->nh_gw != cfg->fc_gw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | goto err_inval; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1095 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1096 | if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | goto err_inval; |
| 1098 | #endif |
| 1099 | #else |
| 1100 | goto err_inval; |
| 1101 | #endif |
| 1102 | } else { |
| 1103 | struct fib_nh *nh = fi->fib_nh; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1104 | |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 1105 | if (cfg->fc_encap) { |
| 1106 | struct lwtunnel_state *lwtstate; |
| 1107 | struct net_device *dev = NULL; |
| 1108 | |
| 1109 | if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE) |
| 1110 | goto err_inval; |
| 1111 | if (cfg->fc_oif) |
| 1112 | dev = __dev_get_by_index(net, cfg->fc_oif); |
| 1113 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 1114 | cfg->fc_encap, AF_INET, cfg, |
| 1115 | &lwtstate); |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 1116 | if (err) |
| 1117 | goto failure; |
| 1118 | |
Nicolas Dichtel | 5a6228a | 2015-07-24 12:28:36 +0200 | [diff] [blame] | 1119 | nh->nh_lwtstate = lwtstate_get(lwtstate); |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 1120 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1121 | nh->nh_oif = cfg->fc_oif; |
| 1122 | nh->nh_gw = cfg->fc_gw; |
| 1123 | nh->nh_flags = cfg->fc_flags; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1124 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1125 | nh->nh_tclassid = cfg->fc_flow; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 1126 | if (nh->nh_tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 1127 | fi->fib_net->ipv4.fib_num_tclassid_users++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 1130 | nh->nh_weight = 1; |
| 1131 | #endif |
| 1132 | } |
| 1133 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1134 | if (fib_props[cfg->fc_type].error) { |
| 1135 | if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | goto err_inval; |
| 1137 | goto link_it; |
David S. Miller | 4c8237c | 2011-03-07 14:27:38 -0800 | [diff] [blame] | 1138 | } else { |
| 1139 | switch (cfg->fc_type) { |
| 1140 | case RTN_UNICAST: |
| 1141 | case RTN_LOCAL: |
| 1142 | case RTN_BROADCAST: |
| 1143 | case RTN_ANYCAST: |
| 1144 | case RTN_MULTICAST: |
| 1145 | break; |
| 1146 | default: |
| 1147 | goto err_inval; |
| 1148 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | } |
| 1150 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1151 | if (cfg->fc_scope > RT_SCOPE_HOST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | goto err_inval; |
| 1153 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1154 | if (cfg->fc_scope == RT_SCOPE_HOST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | struct fib_nh *nh = fi->fib_nh; |
| 1156 | |
| 1157 | /* Local address is added. */ |
| 1158 | if (nhs != 1 || nh->nh_gw) |
| 1159 | goto err_inval; |
| 1160 | nh->nh_scope = RT_SCOPE_NOWHERE; |
Denis V. Lunev | 7462bd74 | 2008-01-31 18:49:32 -0800 | [diff] [blame] | 1161 | 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] | 1162 | err = -ENODEV; |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1163 | if (!nh->nh_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | goto failure; |
| 1165 | } else { |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1166 | int linkdown = 0; |
| 1167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1169 | err = fib_check_nh(cfg, fi, nexthop_nh); |
| 1170 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | goto failure; |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1172 | if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN) |
| 1173 | linkdown++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | } endfor_nexthops(fi) |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1175 | if (linkdown == fi->fib_nhs) |
| 1176 | fi->fib_flags |= RTNH_F_LINKDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | } |
| 1178 | |
David Ahern | 021dd3b | 2015-08-13 14:59:06 -0600 | [diff] [blame] | 1179 | if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc)) |
| 1180 | goto err_inval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
David S. Miller | 1fc050a | 2011-03-07 20:54:48 -0800 | [diff] [blame] | 1182 | change_nexthops(fi) { |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 1183 | fib_info_update_nh_saddr(net, nexthop_nh); |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1184 | fib_add_weight(fi, nexthop_nh); |
David S. Miller | 1fc050a | 2011-03-07 20:54:48 -0800 | [diff] [blame] | 1185 | } endfor_nexthops(fi) |
| 1186 | |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1187 | fib_rebalance(fi); |
| 1188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | link_it: |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1190 | ofi = fib_find_info(fi); |
| 1191 | if (ofi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | fi->fib_dead = 1; |
| 1193 | free_fib_info(fi); |
| 1194 | ofi->fib_treeref++; |
| 1195 | return ofi; |
| 1196 | } |
| 1197 | |
| 1198 | fi->fib_treeref++; |
| 1199 | atomic_inc(&fi->fib_clntref); |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 1200 | spin_lock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | hlist_add_head(&fi->fib_hash, |
| 1202 | &fib_info_hash[fib_info_hashfn(fi)]); |
| 1203 | if (fi->fib_prefsrc) { |
| 1204 | struct hlist_head *head; |
| 1205 | |
| 1206 | head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)]; |
| 1207 | hlist_add_head(&fi->fib_lhash, head); |
| 1208 | } |
| 1209 | change_nexthops(fi) { |
| 1210 | struct hlist_head *head; |
| 1211 | unsigned int hash; |
| 1212 | |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1213 | if (!nexthop_nh->nh_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | continue; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1215 | hash = fib_devindex_hashfn(nexthop_nh->nh_dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | head = &fib_info_devhash[hash]; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1217 | hlist_add_head(&nexthop_nh->nh_hash, head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | } endfor_nexthops(fi) |
Stephen Hemminger | 832b4c5 | 2006-08-29 16:48:09 -0700 | [diff] [blame] | 1219 | spin_unlock_bh(&fib_info_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | return fi; |
| 1221 | |
| 1222 | err_inval: |
| 1223 | err = -EINVAL; |
| 1224 | |
| 1225 | failure: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1226 | if (fi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | fi->fib_dead = 1; |
| 1228 | free_fib_info(fi); |
| 1229 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1230 | |
| 1231 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | } |
| 1233 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1234 | 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] | 1235 | u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos, |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1236 | struct fib_info *fi, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | { |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1238 | struct nlmsghdr *nlh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | struct rtmsg *rtm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1241 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1242 | if (!nlh) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1243 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1244 | |
| 1245 | rtm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | rtm->rtm_family = AF_INET; |
| 1247 | rtm->rtm_dst_len = dst_len; |
| 1248 | rtm->rtm_src_len = 0; |
| 1249 | rtm->rtm_tos = tos; |
Krzysztof Piotr Oledzki | 709772e | 2008-06-10 15:44:49 -0700 | [diff] [blame] | 1250 | if (tb_id < 256) |
| 1251 | rtm->rtm_table = tb_id; |
| 1252 | else |
| 1253 | rtm->rtm_table = RT_TABLE_COMPAT; |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1254 | if (nla_put_u32(skb, RTA_TABLE, tb_id)) |
| 1255 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | rtm->rtm_type = type; |
| 1257 | rtm->rtm_flags = fi->fib_flags; |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 1258 | rtm->rtm_scope = fi->fib_scope; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | rtm->rtm_protocol = fi->fib_protocol; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1260 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1261 | if (rtm->rtm_dst_len && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1262 | nla_put_in_addr(skb, RTA_DST, dst)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1263 | goto nla_put_failure; |
| 1264 | if (fi->fib_priority && |
| 1265 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority)) |
| 1266 | goto nla_put_failure; |
Eric Dumazet | 988b979 | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1267 | if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1268 | goto nla_put_failure; |
| 1269 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1270 | if (fi->fib_prefsrc && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1271 | nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1272 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | if (fi->fib_nhs == 1) { |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1274 | struct in_device *in_dev; |
| 1275 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1276 | if (fi->fib_nh->nh_gw && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1277 | nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1278 | goto nla_put_failure; |
| 1279 | if (fi->fib_nh->nh_oif && |
| 1280 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) |
| 1281 | goto nla_put_failure; |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1282 | if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { |
Andy Gospodarek | 96ac5cc | 2015-06-26 19:37:11 -0400 | [diff] [blame] | 1283 | in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev); |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1284 | if (in_dev && |
| 1285 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) |
| 1286 | rtm->rtm_flags |= RTNH_F_DEAD; |
| 1287 | } |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1288 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1289 | if (fi->fib_nh[0].nh_tclassid && |
| 1290 | nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid)) |
| 1291 | goto nla_put_failure; |
Patrick McHardy | 8265abc | 2006-07-21 15:09:55 -0700 | [diff] [blame] | 1292 | #endif |
David Ahern | 6980c52 | 2017-01-11 14:29:54 -0800 | [diff] [blame] | 1293 | if (fi->fib_nh->nh_lwtstate && |
| 1294 | lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate) < 0) |
| 1295 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | } |
| 1297 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 1298 | if (fi->fib_nhs > 1) { |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1299 | struct rtnexthop *rtnh; |
| 1300 | struct nlattr *mp; |
| 1301 | |
| 1302 | mp = nla_nest_start(skb, RTA_MULTIPATH); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1303 | if (!mp) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1304 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | |
| 1306 | for_nexthops(fi) { |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1307 | struct in_device *in_dev; |
| 1308 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1309 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1310 | if (!rtnh) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1311 | goto nla_put_failure; |
| 1312 | |
| 1313 | rtnh->rtnh_flags = nh->nh_flags & 0xFF; |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1314 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
Andy Gospodarek | 96ac5cc | 2015-06-26 19:37:11 -0400 | [diff] [blame] | 1315 | in_dev = __in_dev_get_rtnl(nh->nh_dev); |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1316 | if (in_dev && |
| 1317 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) |
| 1318 | rtnh->rtnh_flags |= RTNH_F_DEAD; |
| 1319 | } |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1320 | rtnh->rtnh_hops = nh->nh_weight - 1; |
| 1321 | rtnh->rtnh_ifindex = nh->nh_oif; |
| 1322 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1323 | if (nh->nh_gw && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1324 | nla_put_in_addr(skb, RTA_GATEWAY, nh->nh_gw)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1325 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1326 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1327 | if (nh->nh_tclassid && |
| 1328 | nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid)) |
| 1329 | goto nla_put_failure; |
Patrick McHardy | 8265abc | 2006-07-21 15:09:55 -0700 | [diff] [blame] | 1330 | #endif |
David Ahern | 6980c52 | 2017-01-11 14:29:54 -0800 | [diff] [blame] | 1331 | if (nh->nh_lwtstate && |
| 1332 | lwtunnel_fill_encap(skb, nh->nh_lwtstate) < 0) |
| 1333 | goto nla_put_failure; |
| 1334 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1335 | /* length of rtnetlink header + attributes */ |
| 1336 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | } endfor_nexthops(fi); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1338 | |
| 1339 | nla_nest_end(skb, mp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | } |
| 1341 | #endif |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 1342 | nlmsg_end(skb, nlh); |
| 1343 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1345 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1346 | nlmsg_cancel(skb, nlh); |
| 1347 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | } |
| 1349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1351 | * Update FIB if: |
| 1352 | * - local address disappeared -> we must delete all the entries |
| 1353 | * referring to it. |
| 1354 | * - device went down -> we must shutdown all nexthops going via it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | */ |
Mark Tomlinson | 5a56a0b | 2016-09-05 10:20:20 +1200 | [diff] [blame] | 1356 | int fib_sync_down_addr(struct net_device *dev, __be32 local) |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1357 | { |
| 1358 | int ret = 0; |
| 1359 | unsigned int hash = fib_laddr_hashfn(local); |
| 1360 | struct hlist_head *head = &fib_info_laddrhash[hash]; |
Mark Tomlinson | 5a56a0b | 2016-09-05 10:20:20 +1200 | [diff] [blame] | 1361 | struct net *net = dev_net(dev); |
| 1362 | int tb_id = l3mdev_fib_table(dev); |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1363 | struct fib_info *fi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1365 | if (!fib_info_laddrhash || local == 0) |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1366 | return 0; |
| 1367 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1368 | hlist_for_each_entry(fi, head, fib_lhash) { |
Mark Tomlinson | 5a56a0b | 2016-09-05 10:20:20 +1200 | [diff] [blame] | 1369 | if (!net_eq(fi->fib_net, net) || |
| 1370 | fi->fib_tb_id != tb_id) |
Denis V. Lunev | 4814bdb | 2008-01-31 18:50:07 -0800 | [diff] [blame] | 1371 | continue; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1372 | if (fi->fib_prefsrc == local) { |
| 1373 | fi->fib_flags |= RTNH_F_DEAD; |
| 1374 | ret++; |
| 1375 | } |
| 1376 | } |
| 1377 | return ret; |
| 1378 | } |
| 1379 | |
Julian Anastasov | 4f823de | 2015-10-30 10:23:33 +0200 | [diff] [blame] | 1380 | /* Event force Flags Description |
| 1381 | * NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host |
| 1382 | * NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host |
| 1383 | * NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed |
| 1384 | * NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed |
| 1385 | */ |
| 1386 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | { |
| 1388 | int ret = 0; |
| 1389 | int scope = RT_SCOPE_NOWHERE; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1390 | struct fib_info *prev_fi = NULL; |
| 1391 | unsigned int hash = fib_devindex_hashfn(dev->ifindex); |
| 1392 | struct hlist_head *head = &fib_info_devhash[hash]; |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1393 | struct fib_nh *nh; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1394 | |
Julian Anastasov | 4f823de | 2015-10-30 10:23:33 +0200 | [diff] [blame] | 1395 | if (force) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | scope = -1; |
| 1397 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1398 | hlist_for_each_entry(nh, head, nh_hash) { |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1399 | struct fib_info *fi = nh->nh_parent; |
| 1400 | int dead; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1402 | BUG_ON(!fi->fib_nhs); |
| 1403 | if (nh->nh_dev != dev || fi == prev_fi) |
| 1404 | continue; |
| 1405 | prev_fi = fi; |
| 1406 | dead = 0; |
| 1407 | change_nexthops(fi) { |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1408 | if (nexthop_nh->nh_flags & RTNH_F_DEAD) |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1409 | dead++; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1410 | else if (nexthop_nh->nh_dev == dev && |
| 1411 | nexthop_nh->nh_scope != scope) { |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1412 | switch (event) { |
| 1413 | case NETDEV_DOWN: |
| 1414 | case NETDEV_UNREGISTER: |
| 1415 | nexthop_nh->nh_flags |= RTNH_F_DEAD; |
| 1416 | /* fall through */ |
| 1417 | case NETDEV_CHANGE: |
| 1418 | nexthop_nh->nh_flags |= RTNH_F_LINKDOWN; |
| 1419 | break; |
| 1420 | } |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1421 | dead++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | } |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1423 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1424 | if (event == NETDEV_UNREGISTER && |
| 1425 | nexthop_nh->nh_dev == dev) { |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1426 | dead = fi->fib_nhs; |
| 1427 | break; |
| 1428 | } |
| 1429 | #endif |
| 1430 | } endfor_nexthops(fi) |
| 1431 | if (dead == fi->fib_nhs) { |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1432 | switch (event) { |
| 1433 | case NETDEV_DOWN: |
| 1434 | case NETDEV_UNREGISTER: |
| 1435 | fi->fib_flags |= RTNH_F_DEAD; |
| 1436 | /* fall through */ |
| 1437 | case NETDEV_CHANGE: |
| 1438 | fi->fib_flags |= RTNH_F_LINKDOWN; |
| 1439 | break; |
| 1440 | } |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 1441 | ret++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | } |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1443 | |
| 1444 | fib_rebalance(fi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | } |
| 1446 | |
| 1447 | return ret; |
| 1448 | } |
| 1449 | |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1450 | /* Must be invoked inside of an RCU protected region. */ |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1451 | void fib_select_default(const struct flowi4 *flp, struct fib_result *res) |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1452 | { |
| 1453 | struct fib_info *fi = NULL, *last_resort = NULL; |
Alexander Duyck | 56315f9 | 2015-02-25 15:31:31 -0800 | [diff] [blame] | 1454 | struct hlist_head *fa_head = res->fa_head; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1455 | struct fib_table *tb = res->table; |
Julian Anastasov | 18a912e | 2015-07-22 10:43:22 +0300 | [diff] [blame] | 1456 | u8 slen = 32 - res->prefixlen; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1457 | int order = -1, last_idx = -1; |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1458 | struct fib_alias *fa, *fa1 = NULL; |
| 1459 | u32 last_prio = res->fi->fib_priority; |
| 1460 | u8 last_tos = 0; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1461 | |
Alexander Duyck | 56315f9 | 2015-02-25 15:31:31 -0800 | [diff] [blame] | 1462 | hlist_for_each_entry_rcu(fa, fa_head, fa_list) { |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1463 | struct fib_info *next_fi = fa->fa_info; |
| 1464 | |
Julian Anastasov | 18a912e | 2015-07-22 10:43:22 +0300 | [diff] [blame] | 1465 | if (fa->fa_slen != slen) |
| 1466 | continue; |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1467 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
| 1468 | continue; |
Julian Anastasov | 18a912e | 2015-07-22 10:43:22 +0300 | [diff] [blame] | 1469 | if (fa->tb_id != tb->tb_id) |
| 1470 | continue; |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1471 | if (next_fi->fib_priority > last_prio && |
| 1472 | fa->fa_tos == last_tos) { |
| 1473 | if (last_tos) |
| 1474 | continue; |
| 1475 | break; |
| 1476 | } |
| 1477 | if (next_fi->fib_flags & RTNH_F_DEAD) |
| 1478 | continue; |
| 1479 | last_tos = fa->fa_tos; |
| 1480 | last_prio = next_fi->fib_priority; |
| 1481 | |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 1482 | if (next_fi->fib_scope != res->scope || |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1483 | fa->fa_type != RTN_UNICAST) |
| 1484 | continue; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1485 | if (!next_fi->fib_nh[0].nh_gw || |
| 1486 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) |
| 1487 | continue; |
| 1488 | |
| 1489 | fib_alias_accessed(fa); |
| 1490 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1491 | if (!fi) { |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1492 | if (next_fi != res->fi) |
| 1493 | break; |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1494 | fa1 = fa; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1495 | } else if (!fib_detect_death(fi, order, &last_resort, |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1496 | &last_idx, fa1->fa_default)) { |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1497 | fib_result_assign(res, fi); |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1498 | fa1->fa_default = order; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1499 | goto out; |
| 1500 | } |
| 1501 | fi = next_fi; |
| 1502 | order++; |
| 1503 | } |
| 1504 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1505 | if (order <= 0 || !fi) { |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1506 | if (fa1) |
| 1507 | fa1->fa_default = -1; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1508 | goto out; |
| 1509 | } |
| 1510 | |
| 1511 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1512 | fa1->fa_default)) { |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1513 | fib_result_assign(res, fi); |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1514 | fa1->fa_default = order; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1515 | goto out; |
| 1516 | } |
| 1517 | |
| 1518 | if (last_idx >= 0) |
| 1519 | fib_result_assign(res, last_resort); |
Julian Anastasov | 2392deb | 2015-07-22 10:43:23 +0300 | [diff] [blame] | 1520 | fa1->fa_default = last_idx; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1521 | out: |
Eric Dumazet | 31d4093 | 2011-02-14 11:23:04 -0800 | [diff] [blame] | 1522 | return; |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 1523 | } |
| 1524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | /* |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1526 | * Dead device goes up. We wake up dead nexthops. |
| 1527 | * It takes sense only on multipath routes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | */ |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1529 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | { |
| 1531 | struct fib_info *prev_fi; |
| 1532 | unsigned int hash; |
| 1533 | struct hlist_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | struct fib_nh *nh; |
| 1535 | int ret; |
| 1536 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1537 | if (!(dev->flags & IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | return 0; |
| 1539 | |
Julian Anastasov | c9b3292 | 2015-10-30 10:23:34 +0200 | [diff] [blame] | 1540 | if (nh_flags & RTNH_F_DEAD) { |
| 1541 | unsigned int flags = dev_get_flags(dev); |
| 1542 | |
| 1543 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) |
| 1544 | nh_flags |= RTNH_F_LINKDOWN; |
| 1545 | } |
| 1546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | prev_fi = NULL; |
| 1548 | hash = fib_devindex_hashfn(dev->ifindex); |
| 1549 | head = &fib_info_devhash[hash]; |
| 1550 | ret = 0; |
| 1551 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1552 | hlist_for_each_entry(nh, head, nh_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | struct fib_info *fi = nh->nh_parent; |
| 1554 | int alive; |
| 1555 | |
| 1556 | BUG_ON(!fi->fib_nhs); |
| 1557 | if (nh->nh_dev != dev || fi == prev_fi) |
| 1558 | continue; |
| 1559 | |
| 1560 | prev_fi = fi; |
| 1561 | alive = 0; |
| 1562 | change_nexthops(fi) { |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1563 | if (!(nexthop_nh->nh_flags & nh_flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | alive++; |
| 1565 | continue; |
| 1566 | } |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1567 | if (!nexthop_nh->nh_dev || |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 1568 | !(nexthop_nh->nh_dev->flags & IFF_UP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | continue; |
David S. Miller | 71fceff | 2010-01-15 01:16:40 -0800 | [diff] [blame] | 1570 | if (nexthop_nh->nh_dev != dev || |
| 1571 | !__in_dev_get_rtnl(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | continue; |
| 1573 | alive++; |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1574 | nexthop_nh->nh_flags &= ~nh_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | } endfor_nexthops(fi) |
| 1576 | |
| 1577 | if (alive > 0) { |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1578 | fi->fib_flags &= ~nh_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | ret++; |
| 1580 | } |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1581 | |
| 1582 | fib_rebalance(fi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | } |
| 1584 | |
| 1585 | return ret; |
| 1586 | } |
| 1587 | |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1588 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David Ahern | a6db449 | 2016-04-07 07:21:00 -0700 | [diff] [blame] | 1589 | static bool fib_good_nh(const struct fib_nh *nh) |
| 1590 | { |
| 1591 | int state = NUD_REACHABLE; |
| 1592 | |
| 1593 | if (nh->nh_scope == RT_SCOPE_LINK) { |
| 1594 | struct neighbour *n; |
| 1595 | |
| 1596 | rcu_read_lock_bh(); |
| 1597 | |
Eric Dumazet | d985d15 | 2016-08-18 10:19:34 -0700 | [diff] [blame] | 1598 | n = __ipv4_neigh_lookup_noref(nh->nh_dev, |
| 1599 | (__force u32)nh->nh_gw); |
David Ahern | a6db449 | 2016-04-07 07:21:00 -0700 | [diff] [blame] | 1600 | if (n) |
| 1601 | state = n->nud_state; |
| 1602 | |
| 1603 | rcu_read_unlock_bh(); |
| 1604 | } |
| 1605 | |
| 1606 | return !!(state & NUD_VALID); |
| 1607 | } |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 1608 | |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1609 | void fib_select_multipath(struct fib_result *res, int hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | { |
| 1611 | struct fib_info *fi = res->fi; |
David Ahern | a6db449 | 2016-04-07 07:21:00 -0700 | [diff] [blame] | 1612 | struct net *net = fi->fib_net; |
| 1613 | bool first = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1615 | for_nexthops(fi) { |
Xin Long | 8cba34a | 2018-04-01 22:40:35 +0800 | [diff] [blame] | 1616 | if (net->ipv4.sysctl_fib_multipath_use_neigh) { |
| 1617 | if (!fib_good_nh(nh)) |
| 1618 | continue; |
| 1619 | if (!first) { |
| 1620 | res->nh_sel = nhsel; |
| 1621 | first = true; |
| 1622 | } |
| 1623 | } |
| 1624 | |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1625 | if (hash > atomic_read(&nh->nh_upper_bound)) |
| 1626 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
Xin Long | 8cba34a | 2018-04-01 22:40:35 +0800 | [diff] [blame] | 1628 | res->nh_sel = nhsel; |
| 1629 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | } endfor_nexthops(fi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | } |
| 1632 | #endif |
David Ahern | 3ce58d8 | 2015-10-05 08:51:25 -0700 | [diff] [blame] | 1633 | |
| 1634 | void fib_select_path(struct net *net, struct fib_result *res, |
| 1635 | struct flowi4 *fl4, int mp_hash) |
| 1636 | { |
David Ahern | 7b7a5a8 | 2017-01-10 14:37:35 -0800 | [diff] [blame] | 1637 | bool oif_check; |
| 1638 | |
| 1639 | oif_check = (fl4->flowi4_oif == 0 || |
| 1640 | fl4->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF); |
| 1641 | |
David Ahern | 3ce58d8 | 2015-10-05 08:51:25 -0700 | [diff] [blame] | 1642 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David Ahern | 7b7a5a8 | 2017-01-10 14:37:35 -0800 | [diff] [blame] | 1643 | if (res->fi->fib_nhs > 1 && oif_check) { |
David Ahern | 3ce58d8 | 2015-10-05 08:51:25 -0700 | [diff] [blame] | 1644 | if (mp_hash < 0) |
Paolo Abeni | 9920e48 | 2015-10-29 22:20:40 +0100 | [diff] [blame] | 1645 | mp_hash = get_hash_from_flowi4(fl4) >> 1; |
| 1646 | |
David Ahern | 3ce58d8 | 2015-10-05 08:51:25 -0700 | [diff] [blame] | 1647 | fib_select_multipath(res, mp_hash); |
| 1648 | } |
| 1649 | else |
| 1650 | #endif |
| 1651 | if (!res->prefixlen && |
| 1652 | res->table->tb_num_default > 1 && |
David Ahern | 7b7a5a8 | 2017-01-10 14:37:35 -0800 | [diff] [blame] | 1653 | res->type == RTN_UNICAST && oif_check) |
David Ahern | 3ce58d8 | 2015-10-05 08:51:25 -0700 | [diff] [blame] | 1654 | fib_select_default(fl4, res); |
| 1655 | |
| 1656 | if (!fl4->saddr) |
| 1657 | fl4->saddr = FIB_RES_PREFSRC(net, *res); |
| 1658 | } |
| 1659 | EXPORT_SYMBOL_GPL(fib_select_path); |