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; 35b52f070cSThomas Graf /* 3 bytes unused */ 364e902c57SThomas Graf u32 fc_table; 376d85c10aSAl Viro __be32 fc_dst; 386d85c10aSAl Viro __be32 fc_gw; 394e902c57SThomas Graf int fc_oif; 404e902c57SThomas Graf u32 fc_flags; 414e902c57SThomas Graf u32 fc_priority; 426d85c10aSAl Viro __be32 fc_prefsrc; 434e902c57SThomas Graf struct nlattr *fc_mx; 444e902c57SThomas Graf struct rtnexthop *fc_mp; 454e902c57SThomas Graf int fc_mx_len; 464e902c57SThomas Graf int fc_mp_len; 474e902c57SThomas Graf u32 fc_flow; 484e902c57SThomas Graf u32 fc_nlflags; 494e902c57SThomas Graf struct nl_info fc_nlinfo; 50571e7226SRoopa Prabhu struct nlattr *fc_encap; 51571e7226SRoopa Prabhu u16 fc_encap_type; 521da177e4SLinus Torvalds }; 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds struct fib_info; 55f2bb4bedSDavid S. Miller struct rtable; 561da177e4SLinus Torvalds 574895c771SDavid S. Miller struct fib_nh_exception { 584895c771SDavid S. Miller struct fib_nh_exception __rcu *fnhe_next; 595aad1de5STimo Teräs int fnhe_genid; 604895c771SDavid S. Miller __be32 fnhe_daddr; 614895c771SDavid S. Miller u32 fnhe_pmtu; 62d52e5a7eSSabrina Dubroca bool fnhe_mtu_locked; 63aee06da6SJulian Anastasov __be32 fnhe_gw; 644895c771SDavid S. Miller unsigned long fnhe_expires; 652ffae99dSTimo Teräs struct rtable __rcu *fnhe_rth_input; 662ffae99dSTimo Teräs struct rtable __rcu *fnhe_rth_output; 674895c771SDavid S. Miller unsigned long fnhe_stamp; 68deed49dfSXin Long struct rcu_head rcu; 694895c771SDavid S. Miller }; 704895c771SDavid S. Miller 714895c771SDavid S. Miller struct fnhe_hash_bucket { 724895c771SDavid S. Miller struct fib_nh_exception __rcu *chain; 734895c771SDavid S. Miller }; 744895c771SDavid S. Miller 75d546c621SEric Dumazet #define FNHE_HASH_SHIFT 11 76d546c621SEric Dumazet #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) 774895c771SDavid S. Miller #define FNHE_RECLAIM_DEPTH 5 784895c771SDavid S. Miller 791da177e4SLinus Torvalds struct fib_nh { 801da177e4SLinus Torvalds struct net_device *nh_dev; 811da177e4SLinus Torvalds struct hlist_node nh_hash; 821da177e4SLinus Torvalds struct fib_info *nh_parent; 8395c96174SEric Dumazet unsigned int nh_flags; 841da177e4SLinus Torvalds unsigned char nh_scope; 851da177e4SLinus Torvalds #ifdef CONFIG_IP_ROUTE_MULTIPATH 861da177e4SLinus Torvalds int nh_weight; 870e884c78SPeter Nørlund atomic_t nh_upper_bound; 881da177e4SLinus Torvalds #endif 89c7066f70SPatrick McHardy #ifdef CONFIG_IP_ROUTE_CLASSID 901da177e4SLinus Torvalds __u32 nh_tclassid; 911da177e4SLinus Torvalds #endif 921da177e4SLinus Torvalds int nh_oif; 93ed49e3caSAl Viro __be32 nh_gw; 941fc050a1SDavid S. Miller __be32 nh_saddr; 95436c3b66SDavid S. Miller int nh_saddr_genid; 96d26b3a7cSEric Dumazet struct rtable __rcu * __percpu *nh_pcpu_rth_output; 9754764bb6SEric Dumazet struct rtable __rcu *nh_rth_input; 98caa41527SEric Dumazet struct fnhe_hash_bucket __rcu *nh_exceptions; 99571e7226SRoopa Prabhu struct lwtunnel_state *nh_lwtstate; 1001da177e4SLinus Torvalds }; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* 1031da177e4SLinus Torvalds * This structure contains data shared by many of routes. 1041da177e4SLinus Torvalds */ 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds struct fib_info { 1071da177e4SLinus Torvalds struct hlist_node fib_hash; 1081da177e4SLinus Torvalds struct hlist_node fib_lhash; 1097462bd74SDenis V. Lunev struct net *fib_net; 1101da177e4SLinus Torvalds int fib_treeref; 1110029c0deSReshetova, Elena refcount_t fib_clntref; 11295c96174SEric Dumazet unsigned int fib_flags; 11337e826c5SDavid S. Miller unsigned char fib_dead; 11437e826c5SDavid S. Miller unsigned char fib_protocol; 11537e826c5SDavid S. Miller unsigned char fib_scope; 116f4ef85bbSEric Dumazet unsigned char fib_type; 117b83738aeSAl Viro __be32 fib_prefsrc; 1185a56a0b3SMark Tomlinson u32 fib_tb_id; 1191da177e4SLinus Torvalds u32 fib_priority; 1203fb07dafSEric Dumazet struct dst_metrics *fib_metrics; 1213fb07dafSEric Dumazet #define fib_mtu fib_metrics->metrics[RTAX_MTU-1] 1223fb07dafSEric Dumazet #define fib_window fib_metrics->metrics[RTAX_WINDOW-1] 1233fb07dafSEric Dumazet #define fib_rtt fib_metrics->metrics[RTAX_RTT-1] 1243fb07dafSEric Dumazet #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1] 1251da177e4SLinus Torvalds int fib_nhs; 126ebc0ffaeSEric Dumazet struct rcu_head rcu; 1271da177e4SLinus Torvalds struct fib_nh fib_nh[0]; 1281da177e4SLinus Torvalds #define fib_dev fib_nh[0].nh_dev 1291da177e4SLinus Torvalds }; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 1331da177e4SLinus Torvalds struct fib_rule; 1341da177e4SLinus Torvalds #endif 1351da177e4SLinus Torvalds 1365b470441SDavid S. Miller struct fib_table; 1371da177e4SLinus Torvalds struct fib_result { 1386ffd9034SDavid Ahern __be32 prefix; 1391da177e4SLinus Torvalds unsigned char prefixlen; 1401da177e4SLinus Torvalds unsigned char nh_sel; 1411da177e4SLinus Torvalds unsigned char type; 1421da177e4SLinus Torvalds unsigned char scope; 14385b91b03SDavid S. Miller u32 tclassid; 1441da177e4SLinus Torvalds struct fib_info *fi; 1455b470441SDavid S. Miller struct fib_table *table; 14656315f9eSAlexander Duyck struct hlist_head *fa_head; 1471da177e4SLinus Torvalds }; 1481da177e4SLinus Torvalds 149246955feSRobert Olsson struct fib_result_nl { 15080e856e1SAl Viro __be32 fl_addr; /* To be looked up*/ 1515f300893SThomas Graf u32 fl_mark; 152246955feSRobert Olsson unsigned char fl_tos; 153246955feSRobert Olsson unsigned char fl_scope; 154246955feSRobert Olsson unsigned char tb_id_in; 155246955feSRobert Olsson 156246955feSRobert Olsson unsigned char tb_id; /* Results */ 157246955feSRobert Olsson unsigned char prefixlen; 158246955feSRobert Olsson unsigned char nh_sel; 159246955feSRobert Olsson unsigned char type; 160246955feSRobert Olsson unsigned char scope; 161246955feSRobert Olsson int err; 162246955feSRobert Olsson }; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds #ifdef CONFIG_IP_ROUTE_MULTIPATH 1651da177e4SLinus Torvalds #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) 1661da177e4SLinus Torvalds #else /* CONFIG_IP_ROUTE_MULTIPATH */ 1671da177e4SLinus Torvalds #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) 1681da177e4SLinus Torvalds #endif /* CONFIG_IP_ROUTE_MULTIPATH */ 1691da177e4SLinus Torvalds 1705b9e12dbSDenis V. Lunev #ifdef CONFIG_IP_MULTIPLE_TABLES 1715b9e12dbSDenis V. Lunev #define FIB_TABLE_HASHSZ 256 1725b9e12dbSDenis V. Lunev #else 1735b9e12dbSDenis V. Lunev #define FIB_TABLE_HASHSZ 2 1745b9e12dbSDenis V. Lunev #endif 1755b9e12dbSDenis V. Lunev 1765c3a0fd7SJoe Perches __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); 177436c3b66SDavid S. Miller 178436c3b66SDavid S. Miller #define FIB_RES_SADDR(net, res) \ 179436c3b66SDavid S. Miller ((FIB_RES_NH(res).nh_saddr_genid == \ 180436c3b66SDavid S. Miller atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ 181436c3b66SDavid S. Miller FIB_RES_NH(res).nh_saddr : \ 182436c3b66SDavid S. Miller fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) 1831da177e4SLinus Torvalds #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) 1841da177e4SLinus Torvalds #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) 1851da177e4SLinus Torvalds #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) 1861da177e4SLinus Torvalds 187436c3b66SDavid S. Miller #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ 188436c3b66SDavid S. Miller FIB_RES_SADDR(net, res)) 1891fc050a1SDavid S. Miller 190b90eb754SJiri Pirko struct fib_entry_notifier_info { 191b90eb754SJiri Pirko struct fib_notifier_info info; /* must be first */ 192b90eb754SJiri Pirko u32 dst; 193b90eb754SJiri Pirko int dst_len; 194b90eb754SJiri Pirko struct fib_info *fi; 195b90eb754SJiri Pirko u8 tos; 196b90eb754SJiri Pirko u8 type; 197b90eb754SJiri Pirko u32 tb_id; 198b90eb754SJiri Pirko }; 199b90eb754SJiri Pirko 200982acb97SIdo Schimmel struct fib_nh_notifier_info { 201982acb97SIdo Schimmel struct fib_notifier_info info; /* must be first */ 202982acb97SIdo Schimmel struct fib_nh *fib_nh; 203982acb97SIdo Schimmel }; 204982acb97SIdo Schimmel 20504b1d4e5SIdo Schimmel int call_fib4_notifier(struct notifier_block *nb, struct net *net, 206c0243892SIdo Schimmel enum fib_event_type event_type, 207c0243892SIdo Schimmel struct fib_notifier_info *info); 20804b1d4e5SIdo Schimmel int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, 209b90eb754SJiri Pirko struct fib_notifier_info *info); 210b90eb754SJiri Pirko 21104b1d4e5SIdo Schimmel int __net_init fib4_notifier_init(struct net *net); 21204b1d4e5SIdo Schimmel void __net_exit fib4_notifier_exit(struct net *net); 21304b1d4e5SIdo Schimmel 214d05f7a7dSIdo Schimmel void fib_notify(struct net *net, struct notifier_block *nb); 215c0243892SIdo Schimmel 2161da177e4SLinus Torvalds struct fib_table { 2171af5a8c4SPatrick McHardy struct hlist_node tb_hlist; 2182dfe55b4SPatrick McHardy u32 tb_id; 21921d8c49eSDavid S. Miller int tb_num_default; 220a7e53531SAlexander Duyck struct rcu_head rcu; 2210ddcf43dSAlexander Duyck unsigned long *tb_data; 2220ddcf43dSAlexander Duyck unsigned long __data[0]; 2231da177e4SLinus Torvalds }; 2241da177e4SLinus Torvalds 2255c3a0fd7SJoe Perches int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 226ebc0ffaeSEric Dumazet struct fib_result *res, int fib_flags); 2276d8422a1SDavid Ahern int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, 2286d8422a1SDavid Ahern struct netlink_ext_ack *extack); 22978055998SDavid Ahern int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, 23078055998SDavid Ahern struct netlink_ext_ack *extack); 2315c3a0fd7SJoe Perches int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 23216c6cf8bSStephen Hemminger struct netlink_callback *cb); 233b90eb754SJiri Pirko int fib_table_flush(struct net *net, struct fib_table *table); 2340ddcf43dSAlexander Duyck struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); 2353b709334SAlexander Duyck void fib_table_flush_external(struct fib_table *table); 2365c3a0fd7SJoe Perches void fib_free_table(struct fib_table *tb); 2374aa2c466SPavel Emelyanov 2381da177e4SLinus Torvalds #ifndef CONFIG_IP_MULTIPLE_TABLES 2391da177e4SLinus Torvalds 240a5a519b2SAlexander Duyck #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) 241a5a519b2SAlexander Duyck #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) 2421da177e4SLinus Torvalds 2438ad4942cSDenis V. Lunev static inline struct fib_table *fib_get_table(struct net *net, u32 id) 2441da177e4SLinus Torvalds { 245a7e53531SAlexander Duyck struct hlist_node *tb_hlist; 24693456b6dSDenis V. Lunev struct hlist_head *ptr; 24793456b6dSDenis V. Lunev 24893456b6dSDenis V. Lunev ptr = id == RT_TABLE_LOCAL ? 249e4aef8aeSDenis V. Lunev &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : 250e4aef8aeSDenis V. Lunev &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 251a7e53531SAlexander Duyck 252a7e53531SAlexander Duyck tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); 253a7e53531SAlexander Duyck 254a7e53531SAlexander Duyck return hlist_entry(tb_hlist, struct fib_table, tb_hlist); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2578ad4942cSDenis V. Lunev static inline struct fib_table *fib_new_table(struct net *net, u32 id) 2581da177e4SLinus Torvalds { 2598ad4942cSDenis V. Lunev return fib_get_table(net, id); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 26222bd5b9bSDavid S. Miller static inline int fib_lookup(struct net *net, const struct flowi4 *flp, 2630eeb075fSAndy Gospodarek struct fib_result *res, unsigned int flags) 2641da177e4SLinus Torvalds { 265a7e53531SAlexander Duyck struct fib_table *tb; 2660ddcf43dSAlexander Duyck int err = -ENETUNREACH; 26793456b6dSDenis V. Lunev 268345e9b54SAlexander Duyck rcu_read_lock(); 26993456b6dSDenis V. Lunev 270a7e53531SAlexander Duyck tb = fib_get_table(net, RT_TABLE_MAIN); 2710315e382SNikola Forró if (tb) 2720315e382SNikola Forró err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); 2730315e382SNikola Forró 2740315e382SNikola Forró if (err == -EAGAIN) 2750315e382SNikola Forró err = -ENETUNREACH; 276345e9b54SAlexander Duyck 277345e9b54SAlexander Duyck rcu_read_unlock(); 278345e9b54SAlexander Duyck 279345e9b54SAlexander Duyck return err; 2801da177e4SLinus Torvalds } 2811da177e4SLinus Torvalds 2823c71006dSIdo Schimmel static inline bool fib4_rule_default(const struct fib_rule *rule) 2833c71006dSIdo Schimmel { 2843c71006dSIdo Schimmel return true; 2853c71006dSIdo Schimmel } 2863c71006dSIdo Schimmel 2871b2a4440SIdo Schimmel static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb) 2881b2a4440SIdo Schimmel { 2891b2a4440SIdo Schimmel return 0; 2901b2a4440SIdo Schimmel } 2911b2a4440SIdo Schimmel 2921b2a4440SIdo Schimmel static inline unsigned int fib4_rules_seq_read(struct net *net) 2931b2a4440SIdo Schimmel { 2941b2a4440SIdo Schimmel return 0; 2951b2a4440SIdo Schimmel } 2961b2a4440SIdo Schimmel 297e37b1e97SRoopa Prabhu static inline bool fib4_rules_early_flow_dissect(struct net *net, 298e37b1e97SRoopa Prabhu struct sk_buff *skb, 299e37b1e97SRoopa Prabhu struct flowi4 *fl4, 300e37b1e97SRoopa Prabhu struct flow_keys *flkeys) 301e37b1e97SRoopa Prabhu { 302e37b1e97SRoopa Prabhu return false; 303e37b1e97SRoopa Prabhu } 3041da177e4SLinus Torvalds #else /* CONFIG_IP_MULTIPLE_TABLES */ 3055c3a0fd7SJoe Perches int __net_init fib4_rules_init(struct net *net); 3065c3a0fd7SJoe Perches void __net_exit fib4_rules_exit(struct net *net); 307c3e9a353SPavel Emelyanov 3085c3a0fd7SJoe Perches struct fib_table *fib_new_table(struct net *net, u32 id); 3095c3a0fd7SJoe Perches struct fib_table *fib_get_table(struct net *net, u32 id); 3101da177e4SLinus Torvalds 3110eeb075fSAndy Gospodarek int __fib_lookup(struct net *net, struct flowi4 *flp, 3120eeb075fSAndy Gospodarek struct fib_result *res, unsigned int flags); 313f4530fa5SDavid S. Miller 314f4530fa5SDavid S. Miller static inline int fib_lookup(struct net *net, struct flowi4 *flp, 3150eeb075fSAndy Gospodarek struct fib_result *res, unsigned int flags) 316f4530fa5SDavid S. Miller { 317a7e53531SAlexander Duyck struct fib_table *tb; 3180315e382SNikola Forró int err = -ENETUNREACH; 319a7e53531SAlexander Duyck 3200eeb075fSAndy Gospodarek flags |= FIB_LOOKUP_NOREF; 321a7e53531SAlexander Duyck if (net->ipv4.fib_has_custom_rules) 3220eeb075fSAndy Gospodarek return __fib_lookup(net, flp, res, flags); 323345e9b54SAlexander Duyck 324345e9b54SAlexander Duyck rcu_read_lock(); 325345e9b54SAlexander Duyck 32685b91b03SDavid S. Miller res->tclassid = 0; 327a7e53531SAlexander Duyck 328a7e53531SAlexander Duyck tb = rcu_dereference_rtnl(net->ipv4.fib_main); 3290315e382SNikola Forró if (tb) 3300315e382SNikola Forró err = fib_table_lookup(tb, flp, res, flags); 3310315e382SNikola Forró 3320315e382SNikola Forró if (!err) 3330315e382SNikola Forró goto out; 334a7e53531SAlexander Duyck 335a7e53531SAlexander Duyck tb = rcu_dereference_rtnl(net->ipv4.fib_default); 3360315e382SNikola Forró if (tb) 3370315e382SNikola Forró err = fib_table_lookup(tb, flp, res, flags); 3380315e382SNikola Forró 3390315e382SNikola Forró out: 3400315e382SNikola Forró if (err == -EAGAIN) 3410315e382SNikola Forró err = -ENETUNREACH; 342345e9b54SAlexander Duyck 343345e9b54SAlexander Duyck rcu_read_unlock(); 344345e9b54SAlexander Duyck 345345e9b54SAlexander Duyck return err; 346f4530fa5SDavid S. Miller } 347f4530fa5SDavid S. Miller 3483c71006dSIdo Schimmel bool fib4_rule_default(const struct fib_rule *rule); 3491b2a4440SIdo Schimmel int fib4_rules_dump(struct net *net, struct notifier_block *nb); 3501b2a4440SIdo Schimmel unsigned int fib4_rules_seq_read(struct net *net); 3513c71006dSIdo Schimmel 352e37b1e97SRoopa Prabhu static inline bool fib4_rules_early_flow_dissect(struct net *net, 353e37b1e97SRoopa Prabhu struct sk_buff *skb, 354e37b1e97SRoopa Prabhu struct flowi4 *fl4, 355e37b1e97SRoopa Prabhu struct flow_keys *flkeys) 356e37b1e97SRoopa Prabhu { 357e37b1e97SRoopa Prabhu unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; 358e37b1e97SRoopa Prabhu 359e37b1e97SRoopa Prabhu if (!net->ipv4.fib_rules_require_fldissect) 360e37b1e97SRoopa Prabhu return false; 361e37b1e97SRoopa Prabhu 362e37b1e97SRoopa Prabhu skb_flow_dissect_flow_keys(skb, flkeys, flag); 363e37b1e97SRoopa Prabhu fl4->fl4_sport = flkeys->ports.src; 364e37b1e97SRoopa Prabhu fl4->fl4_dport = flkeys->ports.dst; 365e37b1e97SRoopa Prabhu fl4->flowi4_proto = flkeys->basic.ip_proto; 366e37b1e97SRoopa Prabhu 367e37b1e97SRoopa Prabhu return true; 368e37b1e97SRoopa Prabhu } 369e37b1e97SRoopa Prabhu 3701da177e4SLinus Torvalds #endif /* CONFIG_IP_MULTIPLE_TABLES */ 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* Exported by fib_frontend.c */ 373ef7c79edSPatrick McHardy extern const struct nla_policy rtm_ipv4_policy[]; 3745c3a0fd7SJoe Perches void ip_fib_init(void); 3755c3a0fd7SJoe Perches __be32 fib_compute_spec_dst(struct sk_buff *skb); 3765c3a0fd7SJoe Perches int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 3775c04c819SMichael Smith u8 tos, int oif, struct net_device *dev, 3789e56e380SDavid S. Miller struct in_device *idev, u32 *itag); 3797a9bc9b8SDavid S. Miller #ifdef CONFIG_IP_ROUTE_CLASSID 380f4530fa5SDavid S. Miller static inline int fib_num_tclassid_users(struct net *net) 381f4530fa5SDavid S. Miller { 382f4530fa5SDavid S. Miller return net->ipv4.fib_num_tclassid_users; 383f4530fa5SDavid S. Miller } 3847a9bc9b8SDavid S. Miller #else 385f4530fa5SDavid S. Miller static inline int fib_num_tclassid_users(struct net *net) 386f4530fa5SDavid S. Miller { 387f4530fa5SDavid S. Miller return 0; 388f4530fa5SDavid S. Miller } 3897a9bc9b8SDavid S. Miller #endif 3900ddcf43dSAlexander Duyck int fib_unmerge(struct net *net); 39114c85021SArnaldo Carvalho de Melo 3921da177e4SLinus Torvalds /* Exported by fib_semantics.c */ 3935c3a0fd7SJoe Perches int ip_fib_check_default(__be32 gw, struct net_device *dev); 3944f823defSJulian Anastasov int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); 3955a56a0b3SMark Tomlinson int fib_sync_down_addr(struct net_device *dev, __be32 local); 3968a3d0316SAndy Gospodarek int fib_sync_up(struct net_device *dev, unsigned int nh_flags); 3970e884c78SPeter Nørlund 398bf4e0a3dSNikolay Aleksandrov #ifdef CONFIG_IP_ROUTE_MULTIPATH 3997efc0b6bSDavid Ahern int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 400e37b1e97SRoopa Prabhu const struct sk_buff *skb, struct flow_keys *flkeys); 401bf4e0a3dSNikolay Aleksandrov #endif 4020e884c78SPeter Nørlund void fib_select_multipath(struct fib_result *res, int hash); 4033ce58d84SDavid Ahern void fib_select_path(struct net *net, struct fib_result *res, 404bf4e0a3dSNikolay Aleksandrov struct flowi4 *fl4, const struct sk_buff *skb); 4051da177e4SLinus Torvalds 4065348ba85SDavid S. Miller /* Exported by fib_trie.c */ 4075c3a0fd7SJoe Perches void fib_trie_init(void); 4080ddcf43dSAlexander Duyck struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); 4091da177e4SLinus Torvalds 410b6bf3ca0SDavid S. Miller static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) 4111da177e4SLinus Torvalds { 412c7066f70SPatrick McHardy #ifdef CONFIG_IP_ROUTE_CLASSID 4131da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 4141da177e4SLinus Torvalds u32 rtag; 4151da177e4SLinus Torvalds #endif 4161da177e4SLinus Torvalds *itag = FIB_RES_NH(*res).nh_tclassid<<16; 4171da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 41885b91b03SDavid S. Miller rtag = res->tclassid; 4191da177e4SLinus Torvalds if (*itag == 0) 4201da177e4SLinus Torvalds *itag = (rtag<<16); 4211da177e4SLinus Torvalds *itag |= (rtag>>16); 4221da177e4SLinus Torvalds #endif 4231da177e4SLinus Torvalds #endif 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4265c3a0fd7SJoe Perches void free_fib_info(struct fib_info *fi); 4271da177e4SLinus Torvalds 4281c677b3dSIdo Schimmel static inline void fib_info_hold(struct fib_info *fi) 4291c677b3dSIdo Schimmel { 4300029c0deSReshetova, Elena refcount_inc(&fi->fib_clntref); 4311c677b3dSIdo Schimmel } 4321c677b3dSIdo Schimmel 4331da177e4SLinus Torvalds static inline void fib_info_put(struct fib_info *fi) 4341da177e4SLinus Torvalds { 4350029c0deSReshetova, Elena if (refcount_dec_and_test(&fi->fib_clntref)) 4361da177e4SLinus Torvalds free_fib_info(fi); 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 43920380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 4405c3a0fd7SJoe Perches int __net_init fib_proc_init(struct net *net); 4415c3a0fd7SJoe Perches void __net_exit fib_proc_exit(struct net *net); 442cc8274f5SLi Zefan #else 443cc8274f5SLi Zefan static inline int fib_proc_init(struct net *net) 444cc8274f5SLi Zefan { 445cc8274f5SLi Zefan return 0; 446cc8274f5SLi Zefan } 447cc8274f5SLi Zefan static inline void fib_proc_exit(struct net *net) 448cc8274f5SLi Zefan { 449cc8274f5SLi Zefan } 45020380731SArnaldo Carvalho de Melo #endif 45120380731SArnaldo Carvalho de Melo 45250d889b1SDavid Ahern u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); 45350d889b1SDavid Ahern 4541da177e4SLinus Torvalds #endif /* _NET_FIB_H */ 455