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 | * Definitions for the Forwarding Information Base. |
| 7 | * |
| 8 | * Authors: A.N.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 | |
| 16 | #ifndef _NET_IP_FIB_H |
| 17 | #define _NET_IP_FIB_H |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <net/flow.h> |
| 20 | #include <linux/seq_file.h> |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 21 | #include <linux/rcupdate.h> |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 22 | #include <net/fib_rules.h> |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 23 | #include <net/inetpeer.h> |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 24 | #include <linux/percpu.h> |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 25 | #include <linux/notifier.h> |
Reshetova, Elena | 0029c0d | 2017-07-04 09:35:02 +0300 | [diff] [blame] | 26 | #include <linux/refcount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 28 | struct fib_config { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 29 | u8 fc_dst_len; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 30 | u8 fc_tos; |
| 31 | u8 fc_protocol; |
| 32 | u8 fc_scope; |
| 33 | u8 fc_type; |
Thomas Graf | b52f070 | 2006-10-18 20:26:36 -0700 | [diff] [blame] | 34 | /* 3 bytes unused */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 35 | u32 fc_table; |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 36 | __be32 fc_dst; |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 37 | __be32 fc_gw; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 38 | int fc_oif; |
| 39 | u32 fc_flags; |
| 40 | u32 fc_priority; |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 41 | __be32 fc_prefsrc; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 42 | struct nlattr *fc_mx; |
| 43 | struct rtnexthop *fc_mp; |
| 44 | int fc_mx_len; |
| 45 | int fc_mp_len; |
| 46 | u32 fc_flow; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 47 | u32 fc_nlflags; |
| 48 | struct nl_info fc_nlinfo; |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 49 | struct nlattr *fc_encap; |
| 50 | u16 fc_encap_type; |
| 51 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | struct fib_info; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 54 | struct rtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 56 | struct fib_nh_exception { |
| 57 | struct fib_nh_exception __rcu *fnhe_next; |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 58 | int fnhe_genid; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 59 | __be32 fnhe_daddr; |
| 60 | u32 fnhe_pmtu; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 61 | __be32 fnhe_gw; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 62 | unsigned long fnhe_expires; |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 63 | struct rtable __rcu *fnhe_rth_input; |
| 64 | struct rtable __rcu *fnhe_rth_output; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 65 | unsigned long fnhe_stamp; |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 66 | struct rcu_head rcu; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | struct fnhe_hash_bucket { |
| 70 | struct fib_nh_exception __rcu *chain; |
| 71 | }; |
| 72 | |
Eric Dumazet | d546c62 | 2014-09-04 08:21:31 -0700 | [diff] [blame] | 73 | #define FNHE_HASH_SHIFT 11 |
| 74 | #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 75 | #define FNHE_RECLAIM_DEPTH 5 |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | struct fib_nh { |
| 78 | struct net_device *nh_dev; |
| 79 | struct hlist_node nh_hash; |
| 80 | struct fib_info *nh_parent; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 81 | unsigned int nh_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | unsigned char nh_scope; |
| 83 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 84 | int nh_weight; |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 85 | atomic_t nh_upper_bound; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #endif |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 87 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | __u32 nh_tclassid; |
| 89 | #endif |
| 90 | int nh_oif; |
Al Viro | ed49e3c | 2006-09-26 22:13:54 -0700 | [diff] [blame] | 91 | __be32 nh_gw; |
David S. Miller | 1fc050a | 2011-03-07 20:54:48 -0800 | [diff] [blame] | 92 | __be32 nh_saddr; |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 93 | int nh_saddr_genid; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 94 | struct rtable __rcu * __percpu *nh_pcpu_rth_output; |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 95 | struct rtable __rcu *nh_rth_input; |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 96 | struct fnhe_hash_bucket __rcu *nh_exceptions; |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 97 | struct lwtunnel_state *nh_lwtstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | /* |
| 101 | * This structure contains data shared by many of routes. |
| 102 | */ |
| 103 | |
| 104 | struct fib_info { |
| 105 | struct hlist_node fib_hash; |
| 106 | struct hlist_node fib_lhash; |
Denis V. Lunev | 7462bd74 | 2008-01-31 18:49:32 -0800 | [diff] [blame] | 107 | struct net *fib_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | int fib_treeref; |
Reshetova, Elena | 0029c0d | 2017-07-04 09:35:02 +0300 | [diff] [blame] | 109 | refcount_t fib_clntref; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 110 | unsigned int fib_flags; |
David S. Miller | 37e826c | 2011-03-24 18:06:47 -0700 | [diff] [blame] | 111 | unsigned char fib_dead; |
| 112 | unsigned char fib_protocol; |
| 113 | unsigned char fib_scope; |
Eric Dumazet | f4ef85b | 2012-10-04 01:25:26 +0000 | [diff] [blame] | 114 | unsigned char fib_type; |
Al Viro | b83738a | 2006-09-26 22:14:15 -0700 | [diff] [blame] | 115 | __be32 fib_prefsrc; |
Mark Tomlinson | 5a56a0b | 2016-09-05 10:20:20 +1200 | [diff] [blame] | 116 | u32 fib_tb_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | u32 fib_priority; |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 118 | struct dst_metrics *fib_metrics; |
| 119 | #define fib_mtu fib_metrics->metrics[RTAX_MTU-1] |
| 120 | #define fib_window fib_metrics->metrics[RTAX_WINDOW-1] |
| 121 | #define fib_rtt fib_metrics->metrics[RTAX_RTT-1] |
| 122 | #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | int fib_nhs; |
| 124 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 125 | int fib_weight; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #endif |
Jiri Pirko | c985018 | 2016-09-26 12:52:30 +0200 | [diff] [blame] | 127 | unsigned int fib_offload_cnt; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 128 | struct rcu_head rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | struct fib_nh fib_nh[0]; |
| 130 | #define fib_dev fib_nh[0].nh_dev |
| 131 | }; |
| 132 | |
| 133 | |
| 134 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 135 | struct fib_rule; |
| 136 | #endif |
| 137 | |
David S. Miller | 5b47044 | 2011-01-31 16:10:03 -0800 | [diff] [blame] | 138 | struct fib_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | struct fib_result { |
David Ahern | 6ffd903 | 2017-05-25 10:42:37 -0700 | [diff] [blame] | 140 | __be32 prefix; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | unsigned char prefixlen; |
| 142 | unsigned char nh_sel; |
| 143 | unsigned char type; |
| 144 | unsigned char scope; |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 145 | u32 tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct fib_info *fi; |
David S. Miller | 5b47044 | 2011-01-31 16:10:03 -0800 | [diff] [blame] | 147 | struct fib_table *table; |
Alexander Duyck | 56315f9 | 2015-02-25 15:31:31 -0800 | [diff] [blame] | 148 | struct hlist_head *fa_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | }; |
| 150 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 151 | struct fib_result_nl { |
Al Viro | 80e856e | 2006-09-26 22:19:36 -0700 | [diff] [blame] | 152 | __be32 fl_addr; /* To be looked up*/ |
Thomas Graf | 5f300893 | 2006-11-09 15:21:41 -0800 | [diff] [blame] | 153 | u32 fl_mark; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 154 | unsigned char fl_tos; |
| 155 | unsigned char fl_scope; |
| 156 | unsigned char tb_id_in; |
| 157 | |
| 158 | unsigned char tb_id; /* Results */ |
| 159 | unsigned char prefixlen; |
| 160 | unsigned char nh_sel; |
| 161 | unsigned char type; |
| 162 | unsigned char scope; |
| 163 | int err; |
| 164 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
| 166 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 171 | |
Denis V. Lunev | 5b9e12d | 2013-03-13 00:24:15 +0000 | [diff] [blame] | 172 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 173 | #define FIB_TABLE_HASHSZ 256 |
| 174 | #else |
| 175 | #define FIB_TABLE_HASHSZ 2 |
| 176 | #endif |
| 177 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 178 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 179 | |
Jiri Pirko | c985018 | 2016-09-26 12:52:30 +0200 | [diff] [blame] | 180 | static inline void fib_info_offload_inc(struct fib_info *fi) |
| 181 | { |
| 182 | fi->fib_offload_cnt++; |
| 183 | fi->fib_flags |= RTNH_F_OFFLOAD; |
| 184 | } |
| 185 | |
| 186 | static inline void fib_info_offload_dec(struct fib_info *fi) |
| 187 | { |
| 188 | if (--fi->fib_offload_cnt == 0) |
| 189 | fi->fib_flags &= ~RTNH_F_OFFLOAD; |
| 190 | } |
| 191 | |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 192 | #define FIB_RES_SADDR(net, res) \ |
| 193 | ((FIB_RES_NH(res).nh_saddr_genid == \ |
| 194 | atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ |
| 195 | FIB_RES_NH(res).nh_saddr : \ |
| 196 | fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
| 198 | #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) |
| 199 | #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) |
| 200 | |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 201 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
| 202 | FIB_RES_SADDR(net, res)) |
David S. Miller | 1fc050a | 2011-03-07 20:54:48 -0800 | [diff] [blame] | 203 | |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 204 | struct fib_notifier_info { |
| 205 | struct net *net; |
| 206 | }; |
| 207 | |
| 208 | struct fib_entry_notifier_info { |
| 209 | struct fib_notifier_info info; /* must be first */ |
| 210 | u32 dst; |
| 211 | int dst_len; |
| 212 | struct fib_info *fi; |
| 213 | u8 tos; |
| 214 | u8 type; |
| 215 | u32 tb_id; |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 216 | }; |
| 217 | |
Ido Schimmel | 6a003a5 | 2017-03-16 09:08:13 +0100 | [diff] [blame] | 218 | struct fib_rule_notifier_info { |
| 219 | struct fib_notifier_info info; /* must be first */ |
| 220 | struct fib_rule *rule; |
| 221 | }; |
| 222 | |
Ido Schimmel | 982acb9 | 2017-02-08 11:16:39 +0100 | [diff] [blame] | 223 | struct fib_nh_notifier_info { |
| 224 | struct fib_notifier_info info; /* must be first */ |
| 225 | struct fib_nh *fib_nh; |
| 226 | }; |
| 227 | |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 228 | enum fib_event_type { |
Ido Schimmel | 2f3a527 | 2017-02-09 10:28:41 +0100 | [diff] [blame] | 229 | FIB_EVENT_ENTRY_REPLACE, |
| 230 | FIB_EVENT_ENTRY_APPEND, |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 231 | FIB_EVENT_ENTRY_ADD, |
| 232 | FIB_EVENT_ENTRY_DEL, |
| 233 | FIB_EVENT_RULE_ADD, |
| 234 | FIB_EVENT_RULE_DEL, |
Ido Schimmel | 982acb9 | 2017-02-08 11:16:39 +0100 | [diff] [blame] | 235 | FIB_EVENT_NH_ADD, |
| 236 | FIB_EVENT_NH_DEL, |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 237 | }; |
| 238 | |
Ido Schimmel | c3852ef | 2016-12-03 16:45:07 +0100 | [diff] [blame] | 239 | int register_fib_notifier(struct notifier_block *nb, |
| 240 | void (*cb)(struct notifier_block *nb)); |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 241 | int unregister_fib_notifier(struct notifier_block *nb); |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 242 | int call_fib_notifier(struct notifier_block *nb, struct net *net, |
| 243 | enum fib_event_type event_type, |
| 244 | struct fib_notifier_info *info); |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 245 | int call_fib_notifiers(struct net *net, enum fib_event_type event_type, |
| 246 | struct fib_notifier_info *info); |
| 247 | |
Ido Schimmel | d05f7a7 | 2017-03-10 08:56:19 +0100 | [diff] [blame] | 248 | void fib_notify(struct net *net, struct notifier_block *nb); |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 249 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
Ido Schimmel | d05f7a7 | 2017-03-10 08:56:19 +0100 | [diff] [blame] | 250 | void fib_rules_notify(struct net *net, struct notifier_block *nb); |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 251 | #else |
Ido Schimmel | d05f7a7 | 2017-03-10 08:56:19 +0100 | [diff] [blame] | 252 | static inline void fib_rules_notify(struct net *net, struct notifier_block *nb) |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 253 | { |
| 254 | } |
| 255 | #endif |
| 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | struct fib_table { |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 258 | struct hlist_node tb_hlist; |
| 259 | u32 tb_id; |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 260 | int tb_num_default; |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 261 | struct rcu_head rcu; |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 262 | unsigned long *tb_data; |
| 263 | unsigned long __data[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | }; |
| 265 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 266 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
| 267 | struct fib_result *res, int fib_flags); |
David Ahern | 6d8422a1 | 2017-05-21 10:12:02 -0600 | [diff] [blame] | 268 | int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, |
| 269 | struct netlink_ext_ack *extack); |
David Ahern | 7805599 | 2017-05-27 16:19:26 -0600 | [diff] [blame] | 270 | int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, |
| 271 | struct netlink_ext_ack *extack); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 272 | int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
| 273 | struct netlink_callback *cb); |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 274 | int fib_table_flush(struct net *net, struct fib_table *table); |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 275 | struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
Alexander Duyck | 3b70933 | 2016-11-15 05:46:06 -0500 | [diff] [blame] | 276 | void fib_table_flush_external(struct fib_table *table); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 277 | void fib_free_table(struct fib_table *tb); |
Pavel Emelyanov | 4aa2c46 | 2010-10-28 02:00:43 +0000 | [diff] [blame] | 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 280 | |
Alexander Duyck | a5a519b | 2014-12-02 10:58:21 -0800 | [diff] [blame] | 281 | #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
| 282 | #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 284 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | { |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 286 | struct hlist_node *tb_hlist; |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 287 | struct hlist_head *ptr; |
| 288 | |
| 289 | ptr = id == RT_TABLE_LOCAL ? |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 290 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
| 291 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 292 | |
| 293 | tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); |
| 294 | |
| 295 | return hlist_entry(tb_hlist, struct fib_table, tb_hlist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 298 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 300 | return fib_get_table(net, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
| 302 | |
David S. Miller | 22bd5b9 | 2011-03-11 19:54:08 -0500 | [diff] [blame] | 303 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 304 | struct fib_result *res, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | { |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 306 | struct fib_table *tb; |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 307 | int err = -ENETUNREACH; |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 308 | |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 309 | rcu_read_lock(); |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 310 | |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 311 | tb = fib_get_table(net, RT_TABLE_MAIN); |
Nikola Forró | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 312 | if (tb) |
| 313 | err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); |
| 314 | |
| 315 | if (err == -EAGAIN) |
| 316 | err = -ENETUNREACH; |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 317 | |
| 318 | rcu_read_unlock(); |
| 319 | |
| 320 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
Ido Schimmel | 3c71006 | 2017-03-16 09:08:12 +0100 | [diff] [blame] | 323 | static inline bool fib4_rule_default(const struct fib_rule *rule) |
| 324 | { |
| 325 | return true; |
| 326 | } |
| 327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 329 | int __net_init fib4_rules_init(struct net *net); |
| 330 | void __net_exit fib4_rules_exit(struct net *net); |
Pavel Emelyanov | c3e9a35 | 2007-11-06 23:34:04 -0800 | [diff] [blame] | 331 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 332 | struct fib_table *fib_new_table(struct net *net, u32 id); |
| 333 | struct fib_table *fib_get_table(struct net *net, u32 id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 335 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
| 336 | struct fib_result *res, unsigned int flags); |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 337 | |
| 338 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 339 | struct fib_result *res, unsigned int flags) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 340 | { |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 341 | struct fib_table *tb; |
Nikola Forró | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 342 | int err = -ENETUNREACH; |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 343 | |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 344 | flags |= FIB_LOOKUP_NOREF; |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 345 | if (net->ipv4.fib_has_custom_rules) |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 346 | return __fib_lookup(net, flp, res, flags); |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 347 | |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 348 | rcu_read_lock(); |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 349 | |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 350 | res->tclassid = 0; |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 351 | |
Nikola Forró | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 352 | tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
| 353 | if (tb) |
| 354 | err = fib_table_lookup(tb, flp, res, flags); |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 355 | |
Nikola Forró | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 356 | if (!err) |
| 357 | goto out; |
| 358 | |
| 359 | tb = rcu_dereference_rtnl(net->ipv4.fib_default); |
| 360 | if (tb) |
| 361 | err = fib_table_lookup(tb, flp, res, flags); |
| 362 | |
| 363 | out: |
| 364 | if (err == -EAGAIN) |
| 365 | err = -ENETUNREACH; |
Alexander Duyck | a7e5353 | 2015-03-04 15:02:44 -0800 | [diff] [blame] | 366 | |
| 367 | rcu_read_unlock(); |
| 368 | |
| 369 | return err; |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 370 | } |
| 371 | |
Ido Schimmel | 3c71006 | 2017-03-16 09:08:12 +0100 | [diff] [blame] | 372 | bool fib4_rule_default(const struct fib_rule *rule); |
| 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| 375 | |
| 376 | /* Exported by fib_frontend.c */ |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 377 | extern const struct nla_policy rtm_ipv4_policy[]; |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 378 | void ip_fib_init(void); |
| 379 | __be32 fib_compute_spec_dst(struct sk_buff *skb); |
| 380 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
| 381 | u8 tos, int oif, struct net_device *dev, |
| 382 | struct in_device *idev, u32 *itag); |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 383 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 384 | static inline int fib_num_tclassid_users(struct net *net) |
| 385 | { |
| 386 | return net->ipv4.fib_num_tclassid_users; |
| 387 | } |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 388 | #else |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 389 | static inline int fib_num_tclassid_users(struct net *net) |
| 390 | { |
| 391 | return 0; |
| 392 | } |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 393 | #endif |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 394 | int fib_unmerge(struct net *net); |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | /* Exported by fib_semantics.c */ |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 397 | int ip_fib_check_default(__be32 gw, struct net_device *dev); |
Julian Anastasov | 4f823de | 2015-10-30 10:23:33 +0200 | [diff] [blame] | 398 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
Mark Tomlinson | 5a56a0b | 2016-09-05 10:20:20 +1200 | [diff] [blame] | 399 | int fib_sync_down_addr(struct net_device *dev, __be32 local); |
Andy Gospodarek | 8a3d031 | 2015-06-23 13:45:36 -0400 | [diff] [blame] | 400 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags); |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 401 | |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 402 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 403 | int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, |
| 404 | const struct sk_buff *skb); |
| 405 | #endif |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 406 | void fib_select_multipath(struct fib_result *res, int hash); |
David Ahern | 3ce58d8 | 2015-10-05 08:51:25 -0700 | [diff] [blame] | 407 | void fib_select_path(struct net *net, struct fib_result *res, |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 408 | struct flowi4 *fl4, const struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
David S. Miller | 5348ba8 | 2011-02-01 15:30:56 -0800 | [diff] [blame] | 410 | /* Exported by fib_trie.c */ |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 411 | void fib_trie_init(void); |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 412 | struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
David S. Miller | b6bf3ca | 2011-02-16 22:04:57 -0800 | [diff] [blame] | 414 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | { |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 416 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 418 | u32 rtag; |
| 419 | #endif |
| 420 | *itag = FIB_RES_NH(*res).nh_tclassid<<16; |
| 421 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 422 | rtag = res->tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | if (*itag == 0) |
| 424 | *itag = (rtag<<16); |
| 425 | *itag |= (rtag>>16); |
| 426 | #endif |
| 427 | #endif |
| 428 | } |
| 429 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 430 | void free_fib_info(struct fib_info *fi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Ido Schimmel | 1c677b3 | 2016-12-03 16:44:59 +0100 | [diff] [blame] | 432 | static inline void fib_info_hold(struct fib_info *fi) |
| 433 | { |
Reshetova, Elena | 0029c0d | 2017-07-04 09:35:02 +0300 | [diff] [blame] | 434 | refcount_inc(&fi->fib_clntref); |
Ido Schimmel | 1c677b3 | 2016-12-03 16:44:59 +0100 | [diff] [blame] | 435 | } |
| 436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | static inline void fib_info_put(struct fib_info *fi) |
| 438 | { |
Reshetova, Elena | 0029c0d | 2017-07-04 09:35:02 +0300 | [diff] [blame] | 439 | if (refcount_dec_and_test(&fi->fib_clntref)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | free_fib_info(fi); |
| 441 | } |
| 442 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 443 | #ifdef CONFIG_PROC_FS |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 444 | int __net_init fib_proc_init(struct net *net); |
| 445 | void __net_exit fib_proc_exit(struct net *net); |
Li Zefan | cc8274f | 2008-02-05 02:54:16 -0800 | [diff] [blame] | 446 | #else |
| 447 | static inline int fib_proc_init(struct net *net) |
| 448 | { |
| 449 | return 0; |
| 450 | } |
| 451 | static inline void fib_proc_exit(struct net *net) |
| 452 | { |
| 453 | } |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 454 | #endif |
| 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | #endif /* _NET_FIB_H */ |