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> 2204b1d4e5SIdo Schimmel #include <net/fib_notifier.h> 23e1ef4bf2SThomas Graf #include <net/fib_rules.h> 248e773277SDavid S. Miller #include <net/inetpeer.h> 25d26b3a7cSEric Dumazet #include <linux/percpu.h> 26b90eb754SJiri Pirko #include <linux/notifier.h> 270029c0deSReshetova, Elena #include <linux/refcount.h> 281da177e4SLinus Torvalds 294e902c57SThomas Graf struct fib_config { 304e902c57SThomas Graf u8 fc_dst_len; 314e902c57SThomas Graf u8 fc_tos; 324e902c57SThomas Graf u8 fc_protocol; 334e902c57SThomas Graf u8 fc_scope; 344e902c57SThomas Graf u8 fc_type; 35f35b794bSDavid Ahern u8 fc_gw_family; 36f35b794bSDavid Ahern /* 2 bytes unused */ 374e902c57SThomas Graf u32 fc_table; 386d85c10aSAl Viro __be32 fc_dst; 39a4ea5d43SDavid Ahern union { 40f35b794bSDavid Ahern __be32 fc_gw4; 41a4ea5d43SDavid Ahern struct in6_addr fc_gw6; 42a4ea5d43SDavid Ahern }; 434e902c57SThomas Graf int fc_oif; 444e902c57SThomas Graf u32 fc_flags; 454e902c57SThomas Graf u32 fc_priority; 466d85c10aSAl Viro __be32 fc_prefsrc; 474e902c57SThomas Graf struct nlattr *fc_mx; 484e902c57SThomas Graf struct rtnexthop *fc_mp; 494e902c57SThomas Graf int fc_mx_len; 504e902c57SThomas Graf int fc_mp_len; 514e902c57SThomas Graf u32 fc_flow; 524e902c57SThomas Graf u32 fc_nlflags; 534e902c57SThomas Graf struct nl_info fc_nlinfo; 54571e7226SRoopa Prabhu struct nlattr *fc_encap; 55571e7226SRoopa Prabhu u16 fc_encap_type; 561da177e4SLinus Torvalds }; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds struct fib_info; 59f2bb4bedSDavid S. Miller struct rtable; 601da177e4SLinus Torvalds 614895c771SDavid S. Miller struct fib_nh_exception { 624895c771SDavid S. Miller struct fib_nh_exception __rcu *fnhe_next; 635aad1de5STimo Teräs int fnhe_genid; 644895c771SDavid S. Miller __be32 fnhe_daddr; 654895c771SDavid S. Miller u32 fnhe_pmtu; 66d52e5a7eSSabrina Dubroca bool fnhe_mtu_locked; 67aee06da6SJulian Anastasov __be32 fnhe_gw; 684895c771SDavid S. Miller unsigned long fnhe_expires; 692ffae99dSTimo Teräs struct rtable __rcu *fnhe_rth_input; 702ffae99dSTimo Teräs struct rtable __rcu *fnhe_rth_output; 714895c771SDavid S. Miller unsigned long fnhe_stamp; 72deed49dfSXin Long struct rcu_head rcu; 734895c771SDavid S. Miller }; 744895c771SDavid S. Miller 754895c771SDavid S. Miller struct fnhe_hash_bucket { 764895c771SDavid S. Miller struct fib_nh_exception __rcu *chain; 774895c771SDavid S. Miller }; 784895c771SDavid S. Miller 79d546c621SEric Dumazet #define FNHE_HASH_SHIFT 11 80d546c621SEric Dumazet #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) 814895c771SDavid S. Miller #define FNHE_RECLAIM_DEPTH 5 824895c771SDavid S. Miller 83f1741730SDavid Ahern struct fib_nh_common { 84f1741730SDavid Ahern struct net_device *nhc_dev; 85f1741730SDavid Ahern int nhc_oif; 86f1741730SDavid Ahern unsigned char nhc_scope; 87f1741730SDavid Ahern u8 nhc_family; 88bdf00467SDavid Ahern u8 nhc_gw_family; 89ecc5663cSDavid Ahern unsigned char nhc_flags; 90ecc5663cSDavid Ahern struct lwtunnel_state *nhc_lwtstate; 91bdf00467SDavid Ahern 92f1741730SDavid Ahern union { 93f1741730SDavid Ahern __be32 ipv4; 94f1741730SDavid Ahern struct in6_addr ipv6; 95f1741730SDavid Ahern } nhc_gw; 96f1741730SDavid Ahern 97f1741730SDavid Ahern int nhc_weight; 98f1741730SDavid Ahern atomic_t nhc_upper_bound; 990f457a36SDavid Ahern 1000f457a36SDavid Ahern /* v4 specific, but allows fib6_nh with v4 routes */ 1010f457a36SDavid Ahern struct rtable __rcu * __percpu *nhc_pcpu_rth_output; 1020f457a36SDavid Ahern struct rtable __rcu *nhc_rth_input; 103a5995e71SDavid Ahern struct fnhe_hash_bucket __rcu *nhc_exceptions; 104f1741730SDavid Ahern }; 105f1741730SDavid Ahern 1061da177e4SLinus Torvalds struct fib_nh { 107f1741730SDavid Ahern struct fib_nh_common nh_common; 1081da177e4SLinus Torvalds struct hlist_node nh_hash; 1091da177e4SLinus Torvalds struct fib_info *nh_parent; 110c7066f70SPatrick McHardy #ifdef CONFIG_IP_ROUTE_CLASSID 1111da177e4SLinus Torvalds __u32 nh_tclassid; 1121da177e4SLinus Torvalds #endif 1131fc050a1SDavid S. Miller __be32 nh_saddr; 114436c3b66SDavid S. Miller int nh_saddr_genid; 115f1741730SDavid Ahern #define fib_nh_family nh_common.nhc_family 116f1741730SDavid Ahern #define fib_nh_dev nh_common.nhc_dev 117f1741730SDavid Ahern #define fib_nh_oif nh_common.nhc_oif 118f1741730SDavid Ahern #define fib_nh_flags nh_common.nhc_flags 119f1741730SDavid Ahern #define fib_nh_lws nh_common.nhc_lwtstate 120f1741730SDavid Ahern #define fib_nh_scope nh_common.nhc_scope 121bdf00467SDavid Ahern #define fib_nh_gw_family nh_common.nhc_gw_family 122f1741730SDavid Ahern #define fib_nh_gw4 nh_common.nhc_gw.ipv4 123f1741730SDavid Ahern #define fib_nh_gw6 nh_common.nhc_gw.ipv6 124f1741730SDavid Ahern #define fib_nh_weight nh_common.nhc_weight 125f1741730SDavid Ahern #define fib_nh_upper_bound nh_common.nhc_upper_bound 1261da177e4SLinus Torvalds }; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* 1291da177e4SLinus Torvalds * This structure contains data shared by many of routes. 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds 1324c7e8084SDavid Ahern struct nexthop; 1334c7e8084SDavid Ahern 1341da177e4SLinus Torvalds struct fib_info { 1351da177e4SLinus Torvalds struct hlist_node fib_hash; 1361da177e4SLinus Torvalds struct hlist_node fib_lhash; 1374c7e8084SDavid Ahern struct list_head nh_list; 1387462bd74SDenis V. Lunev struct net *fib_net; 1391da177e4SLinus Torvalds int fib_treeref; 1400029c0deSReshetova, Elena refcount_t fib_clntref; 14195c96174SEric Dumazet unsigned int fib_flags; 14237e826c5SDavid S. Miller unsigned char fib_dead; 14337e826c5SDavid S. Miller unsigned char fib_protocol; 14437e826c5SDavid S. Miller unsigned char fib_scope; 145f4ef85bbSEric Dumazet unsigned char fib_type; 146b83738aeSAl Viro __be32 fib_prefsrc; 1475a56a0b3SMark Tomlinson u32 fib_tb_id; 1481da177e4SLinus Torvalds u32 fib_priority; 1493fb07dafSEric Dumazet struct dst_metrics *fib_metrics; 1503fb07dafSEric Dumazet #define fib_mtu fib_metrics->metrics[RTAX_MTU-1] 1513fb07dafSEric Dumazet #define fib_window fib_metrics->metrics[RTAX_WINDOW-1] 1523fb07dafSEric Dumazet #define fib_rtt fib_metrics->metrics[RTAX_RTT-1] 1533fb07dafSEric Dumazet #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1] 1541da177e4SLinus Torvalds int fib_nhs; 15519a9d136SDavid Ahern bool fib_nh_is_v6; 1561bff1a0cSDavid Ahern bool nh_updated; 1574c7e8084SDavid Ahern struct nexthop *nh; 158ebc0ffaeSEric Dumazet struct rcu_head rcu; 1591da177e4SLinus Torvalds struct fib_nh fib_nh[0]; 1601da177e4SLinus Torvalds }; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 1641da177e4SLinus Torvalds struct fib_rule; 1651da177e4SLinus Torvalds #endif 1661da177e4SLinus Torvalds 1675b470441SDavid S. Miller struct fib_table; 1681da177e4SLinus Torvalds struct fib_result { 1696ffd9034SDavid Ahern __be32 prefix; 1701da177e4SLinus Torvalds unsigned char prefixlen; 1711da177e4SLinus Torvalds unsigned char nh_sel; 1721da177e4SLinus Torvalds unsigned char type; 1731da177e4SLinus Torvalds unsigned char scope; 17485b91b03SDavid S. Miller u32 tclassid; 175eba618abSDavid Ahern struct fib_nh_common *nhc; 1761da177e4SLinus Torvalds struct fib_info *fi; 1775b470441SDavid S. Miller struct fib_table *table; 17856315f9eSAlexander Duyck struct hlist_head *fa_head; 1791da177e4SLinus Torvalds }; 1801da177e4SLinus Torvalds 181246955feSRobert Olsson struct fib_result_nl { 18280e856e1SAl Viro __be32 fl_addr; /* To be looked up*/ 1835f300893SThomas Graf u32 fl_mark; 184246955feSRobert Olsson unsigned char fl_tos; 185246955feSRobert Olsson unsigned char fl_scope; 186246955feSRobert Olsson unsigned char tb_id_in; 187246955feSRobert Olsson 188246955feSRobert Olsson unsigned char tb_id; /* Results */ 189246955feSRobert Olsson unsigned char prefixlen; 190246955feSRobert Olsson unsigned char nh_sel; 191246955feSRobert Olsson unsigned char type; 192246955feSRobert Olsson unsigned char scope; 193246955feSRobert Olsson int err; 194246955feSRobert Olsson }; 1951da177e4SLinus Torvalds 1965b9e12dbSDenis V. Lunev #ifdef CONFIG_IP_MULTIPLE_TABLES 1975b9e12dbSDenis V. Lunev #define FIB_TABLE_HASHSZ 256 1985b9e12dbSDenis V. Lunev #else 1995b9e12dbSDenis V. Lunev #define FIB_TABLE_HASHSZ 2 2005b9e12dbSDenis V. Lunev #endif 2015b9e12dbSDenis V. Lunev 202dcb1ecb5SDavid Ahern __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc, 203c3669486SDavid Ahern unsigned char scope); 204eba618abSDavid Ahern __be32 fib_result_prefsrc(struct net *net, struct fib_result *res); 205436c3b66SDavid S. Miller 206eba618abSDavid Ahern #define FIB_RES_NHC(res) ((res).nhc) 207eba618abSDavid Ahern #define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev) 208eba618abSDavid Ahern #define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif) 2091fc050a1SDavid S. Miller 210b90eb754SJiri Pirko struct fib_entry_notifier_info { 211b90eb754SJiri Pirko struct fib_notifier_info info; /* must be first */ 212b90eb754SJiri Pirko u32 dst; 213b90eb754SJiri Pirko int dst_len; 214b90eb754SJiri Pirko struct fib_info *fi; 215b90eb754SJiri Pirko u8 tos; 216b90eb754SJiri Pirko u8 type; 217b90eb754SJiri Pirko u32 tb_id; 218b90eb754SJiri Pirko }; 219b90eb754SJiri Pirko 220982acb97SIdo Schimmel struct fib_nh_notifier_info { 221982acb97SIdo Schimmel struct fib_notifier_info info; /* must be first */ 222982acb97SIdo Schimmel struct fib_nh *fib_nh; 223982acb97SIdo Schimmel }; 224982acb97SIdo Schimmel 22504b1d4e5SIdo Schimmel int call_fib4_notifier(struct notifier_block *nb, struct net *net, 226c0243892SIdo Schimmel enum fib_event_type event_type, 227c0243892SIdo Schimmel struct fib_notifier_info *info); 22804b1d4e5SIdo Schimmel int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, 229b90eb754SJiri Pirko struct fib_notifier_info *info); 230b90eb754SJiri Pirko 23104b1d4e5SIdo Schimmel int __net_init fib4_notifier_init(struct net *net); 23204b1d4e5SIdo Schimmel void __net_exit fib4_notifier_exit(struct net *net); 23304b1d4e5SIdo Schimmel 2341bff1a0cSDavid Ahern void fib_info_notify_update(struct net *net, struct nl_info *info); 235d05f7a7dSIdo Schimmel void fib_notify(struct net *net, struct notifier_block *nb); 236c0243892SIdo Schimmel 2371da177e4SLinus Torvalds struct fib_table { 2381af5a8c4SPatrick McHardy struct hlist_node tb_hlist; 2392dfe55b4SPatrick McHardy u32 tb_id; 24021d8c49eSDavid S. Miller int tb_num_default; 241a7e53531SAlexander Duyck struct rcu_head rcu; 2420ddcf43dSAlexander Duyck unsigned long *tb_data; 2430ddcf43dSAlexander Duyck unsigned long __data[0]; 2441da177e4SLinus Torvalds }; 2451da177e4SLinus Torvalds 2464724676dSDavid Ahern struct fib_dump_filter { 2474724676dSDavid Ahern u32 table_id; 2484724676dSDavid Ahern /* filter_set is an optimization that an entry is set */ 2494724676dSDavid Ahern bool filter_set; 250ae677bbbSDavid Ahern bool dump_all_families; 2514724676dSDavid Ahern unsigned char protocol; 2524724676dSDavid Ahern unsigned char rt_type; 2534724676dSDavid Ahern unsigned int flags; 2544724676dSDavid Ahern struct net_device *dev; 2554724676dSDavid Ahern }; 2564724676dSDavid Ahern 2575c3a0fd7SJoe Perches int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 258ebc0ffaeSEric Dumazet struct fib_result *res, int fib_flags); 2596d8422a1SDavid Ahern int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, 2606d8422a1SDavid Ahern struct netlink_ext_ack *extack); 26178055998SDavid Ahern int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, 26278055998SDavid Ahern struct netlink_ext_ack *extack); 2635c3a0fd7SJoe Perches int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 26418a8021aSDavid Ahern struct netlink_callback *cb, struct fib_dump_filter *filter); 265f97f4dd8SIdo Schimmel int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all); 2660ddcf43dSAlexander Duyck struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); 2673b709334SAlexander Duyck void fib_table_flush_external(struct fib_table *table); 2685c3a0fd7SJoe Perches void fib_free_table(struct fib_table *tb); 2694aa2c466SPavel Emelyanov 2701da177e4SLinus Torvalds #ifndef CONFIG_IP_MULTIPLE_TABLES 2711da177e4SLinus Torvalds 272a5a519b2SAlexander Duyck #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) 273a5a519b2SAlexander Duyck #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) 2741da177e4SLinus Torvalds 2758ad4942cSDenis V. Lunev static inline struct fib_table *fib_get_table(struct net *net, u32 id) 2761da177e4SLinus Torvalds { 277a7e53531SAlexander Duyck struct hlist_node *tb_hlist; 27893456b6dSDenis V. Lunev struct hlist_head *ptr; 27993456b6dSDenis V. Lunev 28093456b6dSDenis V. Lunev ptr = id == RT_TABLE_LOCAL ? 281e4aef8aeSDenis V. Lunev &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : 282e4aef8aeSDenis V. Lunev &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 283a7e53531SAlexander Duyck 284a7e53531SAlexander Duyck tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); 285a7e53531SAlexander Duyck 286a7e53531SAlexander Duyck return hlist_entry(tb_hlist, struct fib_table, tb_hlist); 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2898ad4942cSDenis V. Lunev static inline struct fib_table *fib_new_table(struct net *net, u32 id) 2901da177e4SLinus Torvalds { 2918ad4942cSDenis V. Lunev return fib_get_table(net, id); 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 29422bd5b9bSDavid S. Miller static inline int fib_lookup(struct net *net, const struct flowi4 *flp, 2950eeb075fSAndy Gospodarek struct fib_result *res, unsigned int flags) 2961da177e4SLinus Torvalds { 297a7e53531SAlexander Duyck struct fib_table *tb; 2980ddcf43dSAlexander Duyck int err = -ENETUNREACH; 29993456b6dSDenis V. Lunev 300345e9b54SAlexander Duyck rcu_read_lock(); 30193456b6dSDenis V. Lunev 302a7e53531SAlexander Duyck tb = fib_get_table(net, RT_TABLE_MAIN); 3030315e382SNikola Forró if (tb) 3040315e382SNikola Forró err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); 3050315e382SNikola Forró 3060315e382SNikola Forró if (err == -EAGAIN) 3070315e382SNikola Forró err = -ENETUNREACH; 308345e9b54SAlexander Duyck 309345e9b54SAlexander Duyck rcu_read_unlock(); 310345e9b54SAlexander Duyck 311345e9b54SAlexander Duyck return err; 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3143c71006dSIdo Schimmel static inline bool fib4_rule_default(const struct fib_rule *rule) 3153c71006dSIdo Schimmel { 3163c71006dSIdo Schimmel return true; 3173c71006dSIdo Schimmel } 3183c71006dSIdo Schimmel 3191b2a4440SIdo Schimmel static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb) 3201b2a4440SIdo Schimmel { 3211b2a4440SIdo Schimmel return 0; 3221b2a4440SIdo Schimmel } 3231b2a4440SIdo Schimmel 3241b2a4440SIdo Schimmel static inline unsigned int fib4_rules_seq_read(struct net *net) 3251b2a4440SIdo Schimmel { 3261b2a4440SIdo Schimmel return 0; 3271b2a4440SIdo Schimmel } 3281b2a4440SIdo Schimmel 329e37b1e97SRoopa Prabhu static inline bool fib4_rules_early_flow_dissect(struct net *net, 330e37b1e97SRoopa Prabhu struct sk_buff *skb, 331e37b1e97SRoopa Prabhu struct flowi4 *fl4, 332e37b1e97SRoopa Prabhu struct flow_keys *flkeys) 333e37b1e97SRoopa Prabhu { 334e37b1e97SRoopa Prabhu return false; 335e37b1e97SRoopa Prabhu } 3361da177e4SLinus Torvalds #else /* CONFIG_IP_MULTIPLE_TABLES */ 3375c3a0fd7SJoe Perches int __net_init fib4_rules_init(struct net *net); 3385c3a0fd7SJoe Perches void __net_exit fib4_rules_exit(struct net *net); 339c3e9a353SPavel Emelyanov 3405c3a0fd7SJoe Perches struct fib_table *fib_new_table(struct net *net, u32 id); 3415c3a0fd7SJoe Perches struct fib_table *fib_get_table(struct net *net, u32 id); 3421da177e4SLinus Torvalds 3430eeb075fSAndy Gospodarek int __fib_lookup(struct net *net, struct flowi4 *flp, 3440eeb075fSAndy Gospodarek struct fib_result *res, unsigned int flags); 345f4530fa5SDavid S. Miller 346f4530fa5SDavid S. Miller static inline int fib_lookup(struct net *net, struct flowi4 *flp, 3470eeb075fSAndy Gospodarek struct fib_result *res, unsigned int flags) 348f4530fa5SDavid S. Miller { 349a7e53531SAlexander Duyck struct fib_table *tb; 3500315e382SNikola Forró int err = -ENETUNREACH; 351a7e53531SAlexander Duyck 3520eeb075fSAndy Gospodarek flags |= FIB_LOOKUP_NOREF; 353a7e53531SAlexander Duyck if (net->ipv4.fib_has_custom_rules) 3540eeb075fSAndy Gospodarek return __fib_lookup(net, flp, res, flags); 355345e9b54SAlexander Duyck 356345e9b54SAlexander Duyck rcu_read_lock(); 357345e9b54SAlexander Duyck 35885b91b03SDavid S. Miller res->tclassid = 0; 359a7e53531SAlexander Duyck 360a7e53531SAlexander Duyck tb = rcu_dereference_rtnl(net->ipv4.fib_main); 3610315e382SNikola Forró if (tb) 3620315e382SNikola Forró err = fib_table_lookup(tb, flp, res, flags); 3630315e382SNikola Forró 3640315e382SNikola Forró if (!err) 3650315e382SNikola Forró goto out; 366a7e53531SAlexander Duyck 367a7e53531SAlexander Duyck tb = rcu_dereference_rtnl(net->ipv4.fib_default); 3680315e382SNikola Forró if (tb) 3690315e382SNikola Forró err = fib_table_lookup(tb, flp, res, flags); 3700315e382SNikola Forró 3710315e382SNikola Forró out: 3720315e382SNikola Forró if (err == -EAGAIN) 3730315e382SNikola Forró err = -ENETUNREACH; 374345e9b54SAlexander Duyck 375345e9b54SAlexander Duyck rcu_read_unlock(); 376345e9b54SAlexander Duyck 377345e9b54SAlexander Duyck return err; 378f4530fa5SDavid S. Miller } 379f4530fa5SDavid S. Miller 3803c71006dSIdo Schimmel bool fib4_rule_default(const struct fib_rule *rule); 3811b2a4440SIdo Schimmel int fib4_rules_dump(struct net *net, struct notifier_block *nb); 3821b2a4440SIdo Schimmel unsigned int fib4_rules_seq_read(struct net *net); 3833c71006dSIdo Schimmel 384e37b1e97SRoopa Prabhu static inline bool fib4_rules_early_flow_dissect(struct net *net, 385e37b1e97SRoopa Prabhu struct sk_buff *skb, 386e37b1e97SRoopa Prabhu struct flowi4 *fl4, 387e37b1e97SRoopa Prabhu struct flow_keys *flkeys) 388e37b1e97SRoopa Prabhu { 389e37b1e97SRoopa Prabhu unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; 390e37b1e97SRoopa Prabhu 391e37b1e97SRoopa Prabhu if (!net->ipv4.fib_rules_require_fldissect) 392e37b1e97SRoopa Prabhu return false; 393e37b1e97SRoopa Prabhu 394e37b1e97SRoopa Prabhu skb_flow_dissect_flow_keys(skb, flkeys, flag); 395e37b1e97SRoopa Prabhu fl4->fl4_sport = flkeys->ports.src; 396e37b1e97SRoopa Prabhu fl4->fl4_dport = flkeys->ports.dst; 397e37b1e97SRoopa Prabhu fl4->flowi4_proto = flkeys->basic.ip_proto; 398e37b1e97SRoopa Prabhu 399e37b1e97SRoopa Prabhu return true; 400e37b1e97SRoopa Prabhu } 401e37b1e97SRoopa Prabhu 4021da177e4SLinus Torvalds #endif /* CONFIG_IP_MULTIPLE_TABLES */ 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds /* Exported by fib_frontend.c */ 405ef7c79edSPatrick McHardy extern const struct nla_policy rtm_ipv4_policy[]; 4065c3a0fd7SJoe Perches void ip_fib_init(void); 407d1566268SDavid Ahern int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, 408d1566268SDavid Ahern struct netlink_ext_ack *extack); 4095c3a0fd7SJoe Perches __be32 fib_compute_spec_dst(struct sk_buff *skb); 41078f2756cSDavid Ahern bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev); 4115c3a0fd7SJoe Perches int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 4125c04c819SMichael Smith u8 tos, int oif, struct net_device *dev, 4139e56e380SDavid S. Miller struct in_device *idev, u32 *itag); 4147a9bc9b8SDavid S. Miller #ifdef CONFIG_IP_ROUTE_CLASSID 415f4530fa5SDavid S. Miller static inline int fib_num_tclassid_users(struct net *net) 416f4530fa5SDavid S. Miller { 417f4530fa5SDavid S. Miller return net->ipv4.fib_num_tclassid_users; 418f4530fa5SDavid S. Miller } 4197a9bc9b8SDavid S. Miller #else 420f4530fa5SDavid S. Miller static inline int fib_num_tclassid_users(struct net *net) 421f4530fa5SDavid S. Miller { 422f4530fa5SDavid S. Miller return 0; 423f4530fa5SDavid S. Miller } 4247a9bc9b8SDavid S. Miller #endif 4250ddcf43dSAlexander Duyck int fib_unmerge(struct net *net); 42614c85021SArnaldo Carvalho de Melo 4271da177e4SLinus Torvalds /* Exported by fib_semantics.c */ 4285c3a0fd7SJoe Perches int ip_fib_check_default(__be32 gw, struct net_device *dev); 4294f823defSJulian Anastasov int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); 4305a56a0b3SMark Tomlinson int fib_sync_down_addr(struct net_device *dev, __be32 local); 431ecc5663cSDavid Ahern int fib_sync_up(struct net_device *dev, unsigned char nh_flags); 432af7d6cceSSabrina Dubroca void fib_sync_mtu(struct net_device *dev, u32 orig_mtu); 43306c77c3eSDavid Ahern void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig); 4340e884c78SPeter Nørlund 435bf4e0a3dSNikolay Aleksandrov #ifdef CONFIG_IP_ROUTE_MULTIPATH 4367efc0b6bSDavid Ahern int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 437e37b1e97SRoopa Prabhu const struct sk_buff *skb, struct flow_keys *flkeys); 438bf4e0a3dSNikolay Aleksandrov #endif 439ac1fab2dSDavid Ahern int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, 440ac1fab2dSDavid Ahern struct netlink_ext_ack *extack); 4410e884c78SPeter Nørlund void fib_select_multipath(struct fib_result *res, int hash); 4423ce58d84SDavid Ahern void fib_select_path(struct net *net, struct fib_result *res, 443bf4e0a3dSNikolay Aleksandrov struct flowi4 *fl4, const struct sk_buff *skb); 4441da177e4SLinus Torvalds 445e4516ef6SDavid Ahern int fib_nh_init(struct net *net, struct fib_nh *fib_nh, 446e4516ef6SDavid Ahern struct fib_config *cfg, int nh_weight, 447e4516ef6SDavid Ahern struct netlink_ext_ack *extack); 448faa041a4SDavid Ahern void fib_nh_release(struct net *net, struct fib_nh *fib_nh); 449979e276eSDavid Ahern int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *fc_encap, 450979e276eSDavid Ahern u16 fc_encap_type, void *cfg, gfp_t gfp_flags, 451979e276eSDavid Ahern struct netlink_ext_ack *extack); 452979e276eSDavid Ahern void fib_nh_common_release(struct fib_nh_common *nhc); 453e4516ef6SDavid Ahern 4545348ba85SDavid S. Miller /* Exported by fib_trie.c */ 4555c3a0fd7SJoe Perches void fib_trie_init(void); 4560ddcf43dSAlexander Duyck struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); 4571da177e4SLinus Torvalds 458b6bf3ca0SDavid S. Miller static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) 4591da177e4SLinus Torvalds { 460c7066f70SPatrick McHardy #ifdef CONFIG_IP_ROUTE_CLASSID 461eba618abSDavid Ahern struct fib_nh_common *nhc = res->nhc; 4621da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 4631da177e4SLinus Torvalds u32 rtag; 4641da177e4SLinus Torvalds #endif 465dcb1ecb5SDavid Ahern if (nhc->nhc_family == AF_INET) { 466dcb1ecb5SDavid Ahern struct fib_nh *nh; 467dcb1ecb5SDavid Ahern 468dcb1ecb5SDavid Ahern nh = container_of(nhc, struct fib_nh, nh_common); 469eba618abSDavid Ahern *itag = nh->nh_tclassid << 16; 470dcb1ecb5SDavid Ahern } else { 471dcb1ecb5SDavid Ahern *itag = 0; 472dcb1ecb5SDavid Ahern } 473dcb1ecb5SDavid Ahern 4741da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 47585b91b03SDavid S. Miller rtag = res->tclassid; 4761da177e4SLinus Torvalds if (*itag == 0) 4771da177e4SLinus Torvalds *itag = (rtag<<16); 4781da177e4SLinus Torvalds *itag |= (rtag>>16); 4791da177e4SLinus Torvalds #endif 4801da177e4SLinus Torvalds #endif 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4839bd83667SDavid Ahern void fib_flush(struct net *net); 4845c3a0fd7SJoe Perches void free_fib_info(struct fib_info *fi); 4851da177e4SLinus Torvalds 4861c677b3dSIdo Schimmel static inline void fib_info_hold(struct fib_info *fi) 4871c677b3dSIdo Schimmel { 4880029c0deSReshetova, Elena refcount_inc(&fi->fib_clntref); 4891c677b3dSIdo Schimmel } 4901c677b3dSIdo Schimmel 4911da177e4SLinus Torvalds static inline void fib_info_put(struct fib_info *fi) 4921da177e4SLinus Torvalds { 4930029c0deSReshetova, Elena if (refcount_dec_and_test(&fi->fib_clntref)) 4941da177e4SLinus Torvalds free_fib_info(fi); 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 49720380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 4985c3a0fd7SJoe Perches int __net_init fib_proc_init(struct net *net); 4995c3a0fd7SJoe Perches void __net_exit fib_proc_exit(struct net *net); 500cc8274f5SLi Zefan #else 501cc8274f5SLi Zefan static inline int fib_proc_init(struct net *net) 502cc8274f5SLi Zefan { 503cc8274f5SLi Zefan return 0; 504cc8274f5SLi Zefan } 505cc8274f5SLi Zefan static inline void fib_proc_exit(struct net *net) 506cc8274f5SLi Zefan { 507cc8274f5SLi Zefan } 50820380731SArnaldo Carvalho de Melo #endif 50920380731SArnaldo Carvalho de Melo 51050d889b1SDavid Ahern u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); 51150d889b1SDavid Ahern 5124724676dSDavid Ahern int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 5134724676dSDavid Ahern struct fib_dump_filter *filter, 514effe6792SDavid Ahern struct netlink_callback *cb); 515c0a72077SDavid Ahern 516c0a72077SDavid Ahern int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh, 517ecc5663cSDavid Ahern unsigned char *flags, bool skip_oif); 518c0a72077SDavid Ahern int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh, 519c0a72077SDavid Ahern int nh_weight); 5201da177e4SLinus Torvalds #endif /* _NET_FIB_H */ 521