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