11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Definitions for the Forwarding Information Base. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru> 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 111da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 121da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 131da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #ifndef _NET_IP_FIB_H 171da177e4SLinus Torvalds #define _NET_IP_FIB_H 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <net/flow.h> 201da177e4SLinus Torvalds #include <linux/seq_file.h> 214895c771SDavid S. Miller #include <linux/rcupdate.h> 22e1ef4bf2SThomas Graf #include <net/fib_rules.h> 238e773277SDavid S. Miller #include <net/inetpeer.h> 24d26b3a7cSEric Dumazet #include <linux/percpu.h> 251da177e4SLinus Torvalds 264e902c57SThomas Graf struct fib_config { 274e902c57SThomas Graf u8 fc_dst_len; 284e902c57SThomas Graf u8 fc_tos; 294e902c57SThomas Graf u8 fc_protocol; 304e902c57SThomas Graf u8 fc_scope; 314e902c57SThomas Graf u8 fc_type; 32b52f070cSThomas Graf /* 3 bytes unused */ 334e902c57SThomas Graf u32 fc_table; 346d85c10aSAl Viro __be32 fc_dst; 356d85c10aSAl Viro __be32 fc_gw; 364e902c57SThomas Graf int fc_oif; 374e902c57SThomas Graf u32 fc_flags; 384e902c57SThomas Graf u32 fc_priority; 396d85c10aSAl Viro __be32 fc_prefsrc; 404e902c57SThomas Graf struct nlattr *fc_mx; 414e902c57SThomas Graf struct rtnexthop *fc_mp; 424e902c57SThomas Graf int fc_mx_len; 434e902c57SThomas Graf int fc_mp_len; 444e902c57SThomas Graf u32 fc_flow; 454e902c57SThomas Graf u32 fc_nlflags; 464e902c57SThomas Graf struct nl_info fc_nlinfo; 471da177e4SLinus Torvalds }; 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds struct fib_info; 50f2bb4bedSDavid S. Miller struct rtable; 511da177e4SLinus Torvalds 524895c771SDavid S. Miller struct fib_nh_exception { 534895c771SDavid S. Miller struct fib_nh_exception __rcu *fnhe_next; 545aad1de5STimo Teräs int fnhe_genid; 554895c771SDavid S. Miller __be32 fnhe_daddr; 564895c771SDavid S. Miller u32 fnhe_pmtu; 57aee06da6SJulian Anastasov __be32 fnhe_gw; 584895c771SDavid S. Miller unsigned long fnhe_expires; 592ffae99dSTimo Teräs struct rtable __rcu *fnhe_rth_input; 602ffae99dSTimo Teräs struct rtable __rcu *fnhe_rth_output; 614895c771SDavid S. Miller unsigned long fnhe_stamp; 624895c771SDavid S. Miller }; 634895c771SDavid S. Miller 644895c771SDavid S. Miller struct fnhe_hash_bucket { 654895c771SDavid S. Miller struct fib_nh_exception __rcu *chain; 664895c771SDavid S. Miller }; 674895c771SDavid S. Miller 684895c771SDavid S. Miller #define FNHE_HASH_SIZE 2048 694895c771SDavid S. Miller #define FNHE_RECLAIM_DEPTH 5 704895c771SDavid S. Miller 711da177e4SLinus Torvalds struct fib_nh { 721da177e4SLinus Torvalds struct net_device *nh_dev; 731da177e4SLinus Torvalds struct hlist_node nh_hash; 741da177e4SLinus Torvalds struct fib_info *nh_parent; 7595c96174SEric Dumazet unsigned int nh_flags; 761da177e4SLinus Torvalds unsigned char nh_scope; 771da177e4SLinus Torvalds #ifdef CONFIG_IP_ROUTE_MULTIPATH 781da177e4SLinus Torvalds int nh_weight; 791da177e4SLinus Torvalds int nh_power; 801da177e4SLinus Torvalds #endif 81c7066f70SPatrick McHardy #ifdef CONFIG_IP_ROUTE_CLASSID 821da177e4SLinus Torvalds __u32 nh_tclassid; 831da177e4SLinus Torvalds #endif 841da177e4SLinus Torvalds int nh_oif; 85ed49e3caSAl Viro __be32 nh_gw; 861fc050a1SDavid S. Miller __be32 nh_saddr; 87436c3b66SDavid S. Miller int nh_saddr_genid; 88d26b3a7cSEric Dumazet struct rtable __rcu * __percpu *nh_pcpu_rth_output; 8954764bb6SEric Dumazet struct rtable __rcu *nh_rth_input; 904895c771SDavid S. Miller struct fnhe_hash_bucket *nh_exceptions; 911da177e4SLinus Torvalds }; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* 941da177e4SLinus Torvalds * This structure contains data shared by many of routes. 951da177e4SLinus Torvalds */ 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds struct fib_info { 981da177e4SLinus Torvalds struct hlist_node fib_hash; 991da177e4SLinus Torvalds struct hlist_node fib_lhash; 1007462bd74SDenis V. Lunev struct net *fib_net; 1011da177e4SLinus Torvalds int fib_treeref; 1021da177e4SLinus Torvalds atomic_t fib_clntref; 10395c96174SEric Dumazet unsigned int fib_flags; 10437e826c5SDavid S. Miller unsigned char fib_dead; 10537e826c5SDavid S. Miller unsigned char fib_protocol; 10637e826c5SDavid S. Miller unsigned char fib_scope; 107f4ef85bbSEric Dumazet unsigned char fib_type; 108b83738aeSAl Viro __be32 fib_prefsrc; 1091da177e4SLinus Torvalds u32 fib_priority; 1109c150e82SDavid S. Miller u32 *fib_metrics; 1111da177e4SLinus Torvalds #define fib_mtu fib_metrics[RTAX_MTU-1] 1121da177e4SLinus Torvalds #define fib_window fib_metrics[RTAX_WINDOW-1] 1131da177e4SLinus Torvalds #define fib_rtt fib_metrics[RTAX_RTT-1] 1141da177e4SLinus Torvalds #define fib_advmss fib_metrics[RTAX_ADVMSS-1] 1151da177e4SLinus Torvalds int fib_nhs; 1161da177e4SLinus Torvalds #ifdef CONFIG_IP_ROUTE_MULTIPATH 1171da177e4SLinus Torvalds int fib_power; 1181da177e4SLinus Torvalds #endif 119ebc0ffaeSEric Dumazet struct rcu_head rcu; 1201da177e4SLinus Torvalds struct fib_nh fib_nh[0]; 1211da177e4SLinus Torvalds #define fib_dev fib_nh[0].nh_dev 1221da177e4SLinus Torvalds }; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 1261da177e4SLinus Torvalds struct fib_rule; 1271da177e4SLinus Torvalds #endif 1281da177e4SLinus Torvalds 1295b470441SDavid S. Miller struct fib_table; 1301da177e4SLinus Torvalds struct fib_result { 1311da177e4SLinus Torvalds unsigned char prefixlen; 1321da177e4SLinus Torvalds unsigned char nh_sel; 1331da177e4SLinus Torvalds unsigned char type; 1341da177e4SLinus Torvalds unsigned char scope; 13585b91b03SDavid S. Miller u32 tclassid; 1361da177e4SLinus Torvalds struct fib_info *fi; 1375b470441SDavid S. Miller struct fib_table *table; 1385b470441SDavid S. Miller struct list_head *fa_head; 1391da177e4SLinus Torvalds }; 1401da177e4SLinus Torvalds 141246955feSRobert Olsson struct fib_result_nl { 14280e856e1SAl Viro __be32 fl_addr; /* To be looked up*/ 1435f300893SThomas Graf u32 fl_mark; 144246955feSRobert Olsson unsigned char fl_tos; 145246955feSRobert Olsson unsigned char fl_scope; 146246955feSRobert Olsson unsigned char tb_id_in; 147246955feSRobert Olsson 148246955feSRobert Olsson unsigned char tb_id; /* Results */ 149246955feSRobert Olsson unsigned char prefixlen; 150246955feSRobert Olsson unsigned char nh_sel; 151246955feSRobert Olsson unsigned char type; 152246955feSRobert Olsson unsigned char scope; 153246955feSRobert Olsson int err; 154246955feSRobert Olsson }; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds #ifdef CONFIG_IP_ROUTE_MULTIPATH 1571da177e4SLinus Torvalds #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) 1581da177e4SLinus Torvalds #else /* CONFIG_IP_ROUTE_MULTIPATH */ 1591da177e4SLinus Torvalds #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) 1601da177e4SLinus Torvalds #endif /* CONFIG_IP_ROUTE_MULTIPATH */ 1611da177e4SLinus Torvalds 1625b9e12dbSDenis V. Lunev #ifdef CONFIG_IP_MULTIPLE_TABLES 1635b9e12dbSDenis V. Lunev #define FIB_TABLE_HASHSZ 256 1645b9e12dbSDenis V. Lunev #else 1655b9e12dbSDenis V. Lunev #define FIB_TABLE_HASHSZ 2 1665b9e12dbSDenis V. Lunev #endif 1675b9e12dbSDenis V. Lunev 1685c3a0fd7SJoe Perches __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); 169436c3b66SDavid S. Miller 170436c3b66SDavid S. Miller #define FIB_RES_SADDR(net, res) \ 171436c3b66SDavid S. Miller ((FIB_RES_NH(res).nh_saddr_genid == \ 172436c3b66SDavid S. Miller atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ 173436c3b66SDavid S. Miller FIB_RES_NH(res).nh_saddr : \ 174436c3b66SDavid S. Miller fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) 1751da177e4SLinus Torvalds #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) 1761da177e4SLinus Torvalds #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) 1771da177e4SLinus Torvalds #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) 1781da177e4SLinus Torvalds 179436c3b66SDavid S. Miller #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ 180436c3b66SDavid S. Miller FIB_RES_SADDR(net, res)) 1811fc050a1SDavid S. Miller 1821da177e4SLinus Torvalds struct fib_table { 1831af5a8c4SPatrick McHardy struct hlist_node tb_hlist; 1842dfe55b4SPatrick McHardy u32 tb_id; 185971b893eSDenis V. Lunev int tb_default; 18621d8c49eSDavid S. Miller int tb_num_default; 18721d8c49eSDavid S. Miller unsigned long tb_data[0]; 1881da177e4SLinus Torvalds }; 1891da177e4SLinus Torvalds 1905c3a0fd7SJoe Perches int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 191ebc0ffaeSEric Dumazet struct fib_result *res, int fib_flags); 1925c3a0fd7SJoe Perches int fib_table_insert(struct fib_table *, struct fib_config *); 1935c3a0fd7SJoe Perches int fib_table_delete(struct fib_table *, struct fib_config *); 1945c3a0fd7SJoe Perches int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 19516c6cf8bSStephen Hemminger struct netlink_callback *cb); 1965c3a0fd7SJoe Perches int fib_table_flush(struct fib_table *table); 1975c3a0fd7SJoe Perches void fib_free_table(struct fib_table *tb); 1984aa2c466SPavel Emelyanov 19916c6cf8bSStephen Hemminger 20016c6cf8bSStephen Hemminger 2011da177e4SLinus Torvalds #ifndef CONFIG_IP_MULTIPLE_TABLES 2021da177e4SLinus Torvalds 20393456b6dSDenis V. Lunev #define TABLE_LOCAL_INDEX 0 20493456b6dSDenis V. Lunev #define TABLE_MAIN_INDEX 1 2051da177e4SLinus Torvalds 2068ad4942cSDenis V. Lunev static inline struct fib_table *fib_get_table(struct net *net, u32 id) 2071da177e4SLinus Torvalds { 20893456b6dSDenis V. Lunev struct hlist_head *ptr; 20993456b6dSDenis V. Lunev 21093456b6dSDenis V. Lunev ptr = id == RT_TABLE_LOCAL ? 211e4aef8aeSDenis V. Lunev &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : 212e4aef8aeSDenis V. Lunev &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 21393456b6dSDenis V. Lunev return hlist_entry(ptr->first, struct fib_table, tb_hlist); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2168ad4942cSDenis V. Lunev static inline struct fib_table *fib_new_table(struct net *net, u32 id) 2171da177e4SLinus Torvalds { 2188ad4942cSDenis V. Lunev return fib_get_table(net, id); 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 22122bd5b9bSDavid S. Miller static inline int fib_lookup(struct net *net, const struct flowi4 *flp, 222da0e28cbSDenis V. Lunev struct fib_result *res) 2231da177e4SLinus Torvalds { 22493456b6dSDenis V. Lunev struct fib_table *table; 22593456b6dSDenis V. Lunev 226da0e28cbSDenis V. Lunev table = fib_get_table(net, RT_TABLE_LOCAL); 227ebc0ffaeSEric Dumazet if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF)) 2281da177e4SLinus Torvalds return 0; 22993456b6dSDenis V. Lunev 230da0e28cbSDenis V. Lunev table = fib_get_table(net, RT_TABLE_MAIN); 231ebc0ffaeSEric Dumazet if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF)) 23293456b6dSDenis V. Lunev return 0; 23393456b6dSDenis V. Lunev return -ENETUNREACH; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds #else /* CONFIG_IP_MULTIPLE_TABLES */ 2375c3a0fd7SJoe Perches int __net_init fib4_rules_init(struct net *net); 2385c3a0fd7SJoe Perches void __net_exit fib4_rules_exit(struct net *net); 239c3e9a353SPavel Emelyanov 2405c3a0fd7SJoe Perches struct fib_table *fib_new_table(struct net *net, u32 id); 2415c3a0fd7SJoe Perches struct fib_table *fib_get_table(struct net *net, u32 id); 2421da177e4SLinus Torvalds 2435c3a0fd7SJoe Perches int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res); 244f4530fa5SDavid S. Miller 245f4530fa5SDavid S. Miller static inline int fib_lookup(struct net *net, struct flowi4 *flp, 246f4530fa5SDavid S. Miller struct fib_result *res) 247f4530fa5SDavid S. Miller { 248f4530fa5SDavid S. Miller if (!net->ipv4.fib_has_custom_rules) { 24985b91b03SDavid S. Miller res->tclassid = 0; 250f4530fa5SDavid S. Miller if (net->ipv4.fib_local && 251f4530fa5SDavid S. Miller !fib_table_lookup(net->ipv4.fib_local, flp, res, 252f4530fa5SDavid S. Miller FIB_LOOKUP_NOREF)) 253f4530fa5SDavid S. Miller return 0; 254f4530fa5SDavid S. Miller if (net->ipv4.fib_main && 255f4530fa5SDavid S. Miller !fib_table_lookup(net->ipv4.fib_main, flp, res, 256f4530fa5SDavid S. Miller FIB_LOOKUP_NOREF)) 257f4530fa5SDavid S. Miller return 0; 258f4530fa5SDavid S. Miller if (net->ipv4.fib_default && 259f4530fa5SDavid S. Miller !fib_table_lookup(net->ipv4.fib_default, flp, res, 260f4530fa5SDavid S. Miller FIB_LOOKUP_NOREF)) 261f4530fa5SDavid S. Miller return 0; 262f4530fa5SDavid S. Miller return -ENETUNREACH; 263f4530fa5SDavid S. Miller } 264f4530fa5SDavid S. Miller return __fib_lookup(net, flp, res); 265f4530fa5SDavid S. Miller } 266f4530fa5SDavid S. Miller 2671da177e4SLinus Torvalds #endif /* CONFIG_IP_MULTIPLE_TABLES */ 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds /* Exported by fib_frontend.c */ 270ef7c79edSPatrick McHardy extern const struct nla_policy rtm_ipv4_policy[]; 2715c3a0fd7SJoe Perches void ip_fib_init(void); 2725c3a0fd7SJoe Perches __be32 fib_compute_spec_dst(struct sk_buff *skb); 2735c3a0fd7SJoe Perches int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 2745c04c819SMichael Smith u8 tos, int oif, struct net_device *dev, 2759e56e380SDavid S. Miller struct in_device *idev, u32 *itag); 2765c3a0fd7SJoe Perches void fib_select_default(struct fib_result *res); 2777a9bc9b8SDavid S. Miller #ifdef CONFIG_IP_ROUTE_CLASSID 278f4530fa5SDavid S. Miller static inline int fib_num_tclassid_users(struct net *net) 279f4530fa5SDavid S. Miller { 280f4530fa5SDavid S. Miller return net->ipv4.fib_num_tclassid_users; 281f4530fa5SDavid S. Miller } 2827a9bc9b8SDavid S. Miller #else 283f4530fa5SDavid S. Miller static inline int fib_num_tclassid_users(struct net *net) 284f4530fa5SDavid S. Miller { 285f4530fa5SDavid S. Miller return 0; 286f4530fa5SDavid S. Miller } 2877a9bc9b8SDavid S. Miller #endif 28814c85021SArnaldo Carvalho de Melo 2891da177e4SLinus Torvalds /* Exported by fib_semantics.c */ 2905c3a0fd7SJoe Perches int ip_fib_check_default(__be32 gw, struct net_device *dev); 2915c3a0fd7SJoe Perches int fib_sync_down_dev(struct net_device *dev, int force); 2925c3a0fd7SJoe Perches int fib_sync_down_addr(struct net *net, __be32 local); 2935c3a0fd7SJoe Perches int fib_sync_up(struct net_device *dev); 2945c3a0fd7SJoe Perches void fib_select_multipath(struct fib_result *res); 2951da177e4SLinus Torvalds 2965348ba85SDavid S. Miller /* Exported by fib_trie.c */ 2975c3a0fd7SJoe Perches void fib_trie_init(void); 2985c3a0fd7SJoe Perches struct fib_table *fib_trie_table(u32 id); 2991da177e4SLinus Torvalds 300b6bf3ca0SDavid S. Miller static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) 3011da177e4SLinus Torvalds { 302c7066f70SPatrick McHardy #ifdef CONFIG_IP_ROUTE_CLASSID 3031da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 3041da177e4SLinus Torvalds u32 rtag; 3051da177e4SLinus Torvalds #endif 3061da177e4SLinus Torvalds *itag = FIB_RES_NH(*res).nh_tclassid<<16; 3071da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 30885b91b03SDavid S. Miller rtag = res->tclassid; 3091da177e4SLinus Torvalds if (*itag == 0) 3101da177e4SLinus Torvalds *itag = (rtag<<16); 3111da177e4SLinus Torvalds *itag |= (rtag>>16); 3121da177e4SLinus Torvalds #endif 3131da177e4SLinus Torvalds #endif 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3165c3a0fd7SJoe Perches void free_fib_info(struct fib_info *fi); 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds static inline void fib_info_put(struct fib_info *fi) 3191da177e4SLinus Torvalds { 3201da177e4SLinus Torvalds if (atomic_dec_and_test(&fi->fib_clntref)) 3211da177e4SLinus Torvalds free_fib_info(fi); 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 32420380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 3255c3a0fd7SJoe Perches int __net_init fib_proc_init(struct net *net); 3265c3a0fd7SJoe Perches void __net_exit fib_proc_exit(struct net *net); 327cc8274f5SLi Zefan #else 328cc8274f5SLi Zefan static inline int fib_proc_init(struct net *net) 329cc8274f5SLi Zefan { 330cc8274f5SLi Zefan return 0; 331cc8274f5SLi Zefan } 332cc8274f5SLi Zefan static inline void fib_proc_exit(struct net *net) 333cc8274f5SLi Zefan { 334cc8274f5SLi Zefan } 33520380731SArnaldo Carvalho de Melo #endif 33620380731SArnaldo Carvalho de Melo 3371da177e4SLinus Torvalds #endif /* _NET_FIB_H */ 338