Initial import

1 files changed, 354 insertions, 0 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
new file mode 100644
index 000000000..54271ed0e
--- /dev/null
+++ b/include/net/ip_fib.h
@@ -0,0 +1,354 @@
+/*
+ * 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 */