--- /dev/null
+/*
+ * 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>
+
+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 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 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;
+ int nh_power;
+#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;
+};
+
+/*
+ * 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_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_power;
+#endif
+ 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);
+
+#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_table {
+ struct hlist_node tb_hlist;
+ u32 tb_id;
+ int tb_default;
+ 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 fib_table *, struct fib_config *);
+int fib_table_delete(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 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)
+{
+ struct fib_table *tb;
+ int err = -ENETUNREACH;
+
+ rcu_read_lock();
+
+ tb = fib_get_table(net, RT_TABLE_MAIN);
+ if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
+ err = 0;
+
+ 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);
+
+static inline int fib_lookup(struct net *net, struct flowi4 *flp,
+ struct fib_result *res)
+{
+ struct fib_table *tb;
+ int err;
+
+ if (net->ipv4.fib_has_custom_rules)
+ return __fib_lookup(net, flp, res);
+
+ rcu_read_lock();
+
+ res->tclassid = 0;
+
+ for (err = 0; !err; err = -ENETUNREACH) {
+ tb = rcu_dereference_rtnl(net->ipv4.fib_main);
+ if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
+ break;
+
+ tb = rcu_dereference_rtnl(net->ipv4.fib_default);
+ if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
+ break;
+ }
+
+ 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);
+void fib_select_default(struct fib_result *res);
+#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);
+void fib_flush_external(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, int force);
+int fib_sync_down_addr(struct net *net, __be32 local);
+int fib_sync_up(struct net_device *dev);
+void fib_select_multipath(struct fib_result *res);
+
+/* 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_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 */
Code Review / kvmfornfv.git / blobdiff