| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for the Forwarding Information Base. |
| * |
| * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #ifndef _NET_IP_FIB_H |
| #define _NET_IP_FIB_H |
| |
| #include <net/flow.h> |
| #include <linux/seq_file.h> |
| #include <linux/rcupdate.h> |
| #include <net/fib_rules.h> |
| #include <net/inetpeer.h> |
| #include <linux/percpu.h> |
| #include <linux/notifier.h> |
| |
| struct fib_config { |
| u8 fc_dst_len; |
| u8 fc_tos; |
| u8 fc_protocol; |
| u8 fc_scope; |
| u8 fc_type; |
| /* 3 bytes unused */ |
| u32 fc_table; |
| __be32 fc_dst; |
| __be32 fc_gw; |
| int fc_oif; |
| u32 fc_flags; |
| u32 fc_priority; |
| __be32 fc_prefsrc; |
| struct nlattr *fc_mx; |
| struct rtnexthop *fc_mp; |
| int fc_mx_len; |
| int fc_mp_len; |
| u32 fc_flow; |
| u32 fc_nlflags; |
| struct nl_info fc_nlinfo; |
| struct nlattr *fc_encap; |
| u16 fc_encap_type; |
| }; |
| |
| struct fib_info; |
| struct rtable; |
| |
| struct fib_nh_exception { |
| struct fib_nh_exception __rcu *fnhe_next; |
| int fnhe_genid; |
| __be32 fnhe_daddr; |
| u32 fnhe_pmtu; |
| __be32 fnhe_gw; |
| unsigned long fnhe_expires; |
| struct rtable __rcu *fnhe_rth_input; |
| struct rtable __rcu *fnhe_rth_output; |
| unsigned long fnhe_stamp; |
| struct rcu_head rcu; |
| }; |
| |
| struct fnhe_hash_bucket { |
| struct fib_nh_exception __rcu *chain; |
| }; |
| |
| #define FNHE_HASH_SHIFT 11 |
| #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) |
| #define FNHE_RECLAIM_DEPTH 5 |
| |
| struct fib_nh { |
| struct net_device *nh_dev; |
| struct hlist_node nh_hash; |
| struct fib_info *nh_parent; |
| unsigned int nh_flags; |
| unsigned char nh_scope; |
| #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| int nh_weight; |
| atomic_t nh_upper_bound; |
| #endif |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| __u32 nh_tclassid; |
| #endif |
| int nh_oif; |
| __be32 nh_gw; |
| __be32 nh_saddr; |
| int nh_saddr_genid; |
| struct rtable __rcu * __percpu *nh_pcpu_rth_output; |
| struct rtable __rcu *nh_rth_input; |
| struct fnhe_hash_bucket __rcu *nh_exceptions; |
| struct lwtunnel_state *nh_lwtstate; |
| }; |
| |
| /* |
| * This structure contains data shared by many of routes. |
| */ |
| |
| struct fib_info { |
| struct hlist_node fib_hash; |
| struct hlist_node fib_lhash; |
| struct net *fib_net; |
| int fib_treeref; |
| atomic_t fib_clntref; |
| unsigned int fib_flags; |
| unsigned char fib_dead; |
| unsigned char fib_protocol; |
| unsigned char fib_scope; |
| unsigned char fib_type; |
| __be32 fib_prefsrc; |
| u32 fib_tb_id; |
| u32 fib_priority; |
| u32 *fib_metrics; |
| #define fib_mtu fib_metrics[RTAX_MTU-1] |
| #define fib_window fib_metrics[RTAX_WINDOW-1] |
| #define fib_rtt fib_metrics[RTAX_RTT-1] |
| #define fib_advmss fib_metrics[RTAX_ADVMSS-1] |
| int fib_nhs; |
| #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| int fib_weight; |
| #endif |
| unsigned int fib_offload_cnt; |
| struct rcu_head rcu; |
| struct fib_nh fib_nh[0]; |
| #define fib_dev fib_nh[0].nh_dev |
| }; |
| |
| |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| struct fib_rule; |
| #endif |
| |
| struct fib_table; |
| struct fib_result { |
| unsigned char prefixlen; |
| unsigned char nh_sel; |
| unsigned char type; |
| unsigned char scope; |
| u32 tclassid; |
| struct fib_info *fi; |
| struct fib_table *table; |
| struct hlist_head *fa_head; |
| }; |
| |
| struct fib_result_nl { |
| __be32 fl_addr; /* To be looked up*/ |
| u32 fl_mark; |
| unsigned char fl_tos; |
| unsigned char fl_scope; |
| unsigned char tb_id_in; |
| |
| unsigned char tb_id; /* Results */ |
| unsigned char prefixlen; |
| unsigned char nh_sel; |
| unsigned char type; |
| unsigned char scope; |
| int err; |
| }; |
| |
| #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
| #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
| #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
| #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
| |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| #define FIB_TABLE_HASHSZ 256 |
| #else |
| #define FIB_TABLE_HASHSZ 2 |
| #endif |
| |
| __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
| |
| static inline void fib_info_offload_inc(struct fib_info *fi) |
| { |
| fi->fib_offload_cnt++; |
| fi->fib_flags |= RTNH_F_OFFLOAD; |
| } |
| |
| static inline void fib_info_offload_dec(struct fib_info *fi) |
| { |
| if (--fi->fib_offload_cnt == 0) |
| fi->fib_flags &= ~RTNH_F_OFFLOAD; |
| } |
| |
| #define FIB_RES_SADDR(net, res) \ |
| ((FIB_RES_NH(res).nh_saddr_genid == \ |
| atomic_read(&(net)->ipv4.dev_addr_genid)) ? \ |
| FIB_RES_NH(res).nh_saddr : \ |
| fib_info_update_nh_saddr((net), &FIB_RES_NH(res))) |
| #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw) |
| #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev) |
| #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif) |
| |
| #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
| FIB_RES_SADDR(net, res)) |
| |
| struct fib_notifier_info { |
| struct net *net; |
| }; |
| |
| struct fib_entry_notifier_info { |
| struct fib_notifier_info info; /* must be first */ |
| u32 dst; |
| int dst_len; |
| struct fib_info *fi; |
| u8 tos; |
| u8 type; |
| u32 tb_id; |
| u32 nlflags; |
| }; |
| |
| struct fib_nh_notifier_info { |
| struct fib_notifier_info info; /* must be first */ |
| struct fib_nh *fib_nh; |
| }; |
| |
| enum fib_event_type { |
| FIB_EVENT_ENTRY_ADD, |
| FIB_EVENT_ENTRY_DEL, |
| FIB_EVENT_RULE_ADD, |
| FIB_EVENT_RULE_DEL, |
| FIB_EVENT_NH_ADD, |
| FIB_EVENT_NH_DEL, |
| }; |
| |
| int register_fib_notifier(struct notifier_block *nb, |
| void (*cb)(struct notifier_block *nb)); |
| int unregister_fib_notifier(struct notifier_block *nb); |
| int call_fib_notifiers(struct net *net, enum fib_event_type event_type, |
| struct fib_notifier_info *info); |
| |
| struct fib_table { |
| struct hlist_node tb_hlist; |
| u32 tb_id; |
| int tb_num_default; |
| struct rcu_head rcu; |
| unsigned long *tb_data; |
| unsigned long __data[0]; |
| }; |
| |
| int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
| struct fib_result *res, int fib_flags); |
| int fib_table_insert(struct net *, struct fib_table *, struct fib_config *); |
| int fib_table_delete(struct net *, struct fib_table *, struct fib_config *); |
| int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
| struct netlink_callback *cb); |
| int fib_table_flush(struct net *net, struct fib_table *table); |
| struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
| void fib_table_flush_external(struct fib_table *table); |
| void fib_free_table(struct fib_table *tb); |
| |
| #ifndef CONFIG_IP_MULTIPLE_TABLES |
| |
| #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
| #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) |
| |
| static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
| { |
| struct hlist_node *tb_hlist; |
| struct hlist_head *ptr; |
| |
| ptr = id == RT_TABLE_LOCAL ? |
| &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
| &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; |
| |
| tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); |
| |
| return hlist_entry(tb_hlist, struct fib_table, tb_hlist); |
| } |
| |
| static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
| { |
| return fib_get_table(net, id); |
| } |
| |
| static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
| struct fib_result *res, unsigned int flags) |
| { |
| struct fib_table *tb; |
| int err = -ENETUNREACH; |
| |
| rcu_read_lock(); |
| |
| tb = fib_get_table(net, RT_TABLE_MAIN); |
| if (tb) |
| err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); |
| |
| if (err == -EAGAIN) |
| err = -ENETUNREACH; |
| |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| #else /* CONFIG_IP_MULTIPLE_TABLES */ |
| int __net_init fib4_rules_init(struct net *net); |
| void __net_exit fib4_rules_exit(struct net *net); |
| |
| struct fib_table *fib_new_table(struct net *net, u32 id); |
| struct fib_table *fib_get_table(struct net *net, u32 id); |
| |
| int __fib_lookup(struct net *net, struct flowi4 *flp, |
| struct fib_result *res, unsigned int flags); |
| |
| static inline int fib_lookup(struct net *net, struct flowi4 *flp, |
| struct fib_result *res, unsigned int flags) |
| { |
| struct fib_table *tb; |
| int err = -ENETUNREACH; |
| |
| flags |= FIB_LOOKUP_NOREF; |
| if (net->ipv4.fib_has_custom_rules) |
| return __fib_lookup(net, flp, res, flags); |
| |
| rcu_read_lock(); |
| |
| res->tclassid = 0; |
| |
| tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
| if (tb) |
| err = fib_table_lookup(tb, flp, res, flags); |
| |
| if (!err) |
| goto out; |
| |
| tb = rcu_dereference_rtnl(net->ipv4.fib_default); |
| if (tb) |
| err = fib_table_lookup(tb, flp, res, flags); |
| |
| out: |
| if (err == -EAGAIN) |
| err = -ENETUNREACH; |
| |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| |
| /* Exported by fib_frontend.c */ |
| extern const struct nla_policy rtm_ipv4_policy[]; |
| void ip_fib_init(void); |
| __be32 fib_compute_spec_dst(struct sk_buff *skb); |
| int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
| u8 tos, int oif, struct net_device *dev, |
| struct in_device *idev, u32 *itag); |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| static inline int fib_num_tclassid_users(struct net *net) |
| { |
| return net->ipv4.fib_num_tclassid_users; |
| } |
| #else |
| static inline int fib_num_tclassid_users(struct net *net) |
| { |
| return 0; |
| } |
| #endif |
| int fib_unmerge(struct net *net); |
| |
| /* Exported by fib_semantics.c */ |
| int ip_fib_check_default(__be32 gw, struct net_device *dev); |
| int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
| int fib_sync_down_addr(struct net_device *dev, __be32 local); |
| int fib_sync_up(struct net_device *dev, unsigned int nh_flags); |
| |
| extern u32 fib_multipath_secret __read_mostly; |
| |
| static inline int fib_multipath_hash(__be32 saddr, __be32 daddr) |
| { |
| return jhash_2words((__force u32)saddr, (__force u32)daddr, |
| fib_multipath_secret) >> 1; |
| } |
| |
| void fib_select_multipath(struct fib_result *res, int hash); |
| void fib_select_path(struct net *net, struct fib_result *res, |
| struct flowi4 *fl4, int mp_hash); |
| |
| /* Exported by fib_trie.c */ |
| void fib_trie_init(void); |
| struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
| |
| static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
| { |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| u32 rtag; |
| #endif |
| *itag = FIB_RES_NH(*res).nh_tclassid<<16; |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| rtag = res->tclassid; |
| if (*itag == 0) |
| *itag = (rtag<<16); |
| *itag |= (rtag>>16); |
| #endif |
| #endif |
| } |
| |
| void free_fib_info(struct fib_info *fi); |
| |
| static inline void fib_info_hold(struct fib_info *fi) |
| { |
| atomic_inc(&fi->fib_clntref); |
| } |
| |
| static inline void fib_info_put(struct fib_info *fi) |
| { |
| if (atomic_dec_and_test(&fi->fib_clntref)) |
| free_fib_info(fi); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| int __net_init fib_proc_init(struct net *net); |
| void __net_exit fib_proc_exit(struct net *net); |
| #else |
| static inline int fib_proc_init(struct net *net) |
| { |
| return 0; |
| } |
| static inline void fib_proc_exit(struct net *net) |
| { |
| } |
| #endif |
| |
| #endif /* _NET_FIB_H */ |