1 files changed, 284 insertions, 0 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
new file mode 100644
index 000000000000..e5a5f6b62f88
--- /dev/null
+++ b/include/net/ip_fib.h
@@ -0,0 +1,284 @@
+/*
+ * 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 <linux/config.h>
+#include <net/flow.h>
+#include <linux/seq_file.h>
+
+/* WARNING: The ordering of these elements must match ordering
+ *          of RTA_* rtnetlink attribute numbers.
+ */
+struct kern_rta {
+	void		*rta_dst;
+	void		*rta_src;
+	int		*rta_iif;
+	int		*rta_oif;
+	void		*rta_gw;
+	u32		*rta_priority;
+	void		*rta_prefsrc;
+	struct rtattr	*rta_mx;
+	struct rtattr	*rta_mp;
+	unsigned char	*rta_protoinfo;
+	u32		*rta_flow;
+	struct rta_cacheinfo *rta_ci;
+	struct rta_session *rta_sess;
+	u32		*rta_mp_alg;
+};
+
+struct fib_info;
+
+struct fib_nh {
+	struct net_device	*nh_dev;
+	struct hlist_node	nh_hash;
+	struct fib_info		*nh_parent;
+	unsigned		nh_flags;
+	unsigned char		nh_scope;
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+	int			nh_weight;
+	int			nh_power;
+#endif
+#ifdef CONFIG_NET_CLS_ROUTE
+	__u32			nh_tclassid;
+#endif
+	int			nh_oif;
+	u32			nh_gw;
+};
+
+/*
+ * This structure contains data shared by many of routes.
+ */
+
+struct fib_info {
+	struct hlist_node	fib_hash;
+	struct hlist_node	fib_lhash;
+	int			fib_treeref;
+	atomic_t		fib_clntref;
+	int			fib_dead;
+	unsigned		fib_flags;
+	int			fib_protocol;
+	u32			fib_prefsrc;
+	u32			fib_priority;
+	u32			fib_metrics[RTAX_MAX];
+#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
+#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
+	u32			fib_mp_alg;
+#endif
+	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_result {
+	unsigned char	prefixlen;
+	unsigned char	nh_sel;
+	unsigned char	type;
+	unsigned char	scope;
+#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
+	__u32           network;
+	__u32           netmask;
+#endif
+	struct fib_info *fi;
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+	struct fib_rule	*r;
+#endif
+};
+
+
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+
+#define FIB_RES_NH(res)		((res).fi->fib_nh[(res).nh_sel])
+#define FIB_RES_RESET(res)	((res).nh_sel = 0)
+
+#else /* CONFIG_IP_ROUTE_MULTIPATH */
+
+#define FIB_RES_NH(res)		((res).fi->fib_nh[0])
+#define FIB_RES_RESET(res)
+
+#endif /* CONFIG_IP_ROUTE_MULTIPATH */
+
+#define FIB_RES_PREFSRC(res)		((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&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)
+
+#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
+#define FIB_RES_NETWORK(res)		((res).network)
+#define FIB_RES_NETMASK(res)	        ((res).netmask)
+#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
+#define FIB_RES_NETWORK(res)		(0)
+#define FIB_RES_NETMASK(res)	        (0)
+#endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
+
+struct fib_table {
+	unsigned char	tb_id;
+	unsigned	tb_stamp;
+	int		(*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
+	int		(*tb_insert)(struct fib_table *table, struct rtmsg *r,
+				     struct kern_rta *rta, struct nlmsghdr *n,
+				     struct netlink_skb_parms *req);
+	int		(*tb_delete)(struct fib_table *table, struct rtmsg *r,
+				     struct kern_rta *rta, struct nlmsghdr *n,
+				     struct netlink_skb_parms *req);
+	int		(*tb_dump)(struct fib_table *table, struct sk_buff *skb,
+				     struct netlink_callback *cb);
+	int		(*tb_flush)(struct fib_table *table);
+	void		(*tb_select_default)(struct fib_table *table,
+					     const struct flowi *flp, struct fib_result *res);
+
+	unsigned char	tb_data[0];
+};
+
+#ifndef CONFIG_IP_MULTIPLE_TABLES
+
+extern struct fib_table *ip_fib_local_table;
+extern struct fib_table *ip_fib_main_table;
+
+static inline struct fib_table *fib_get_table(int id)
+{
+	if (id != RT_TABLE_LOCAL)
+		return ip_fib_main_table;
+	return ip_fib_local_table;
+}
+
+static inline struct fib_table *fib_new_table(int id)
+{
+	return fib_get_table(id);
+}
+
+static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
+{
+	if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
+	    ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
+		return -ENETUNREACH;
+	return 0;
+}
+
+static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
+{
+	if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
+		ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
+}
+
+#else /* CONFIG_IP_MULTIPLE_TABLES */
+#define ip_fib_local_table (fib_tables[RT_TABLE_LOCAL])
+#define ip_fib_main_table (fib_tables[RT_TABLE_MAIN])
+
+extern struct fib_table * fib_tables[RT_TABLE_MAX+1];
+extern int fib_lookup(const struct flowi *flp, struct fib_result *res);
+extern struct fib_table *__fib_new_table(int id);
+extern void fib_rule_put(struct fib_rule *r);
+
+static inline struct fib_table *fib_get_table(int id)
+{
+	if (id == 0)
+		id = RT_TABLE_MAIN;
+
+	return fib_tables[id];
+}
+
+static inline struct fib_table *fib_new_table(int id)
+{
+	if (id == 0)
+		id = RT_TABLE_MAIN;
+
+	return fib_tables[id] ? : __fib_new_table(id);
+}
+
+extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
+
+#endif /* CONFIG_IP_MULTIPLE_TABLES */
+
+/* Exported by fib_frontend.c */
+extern void		ip_fib_init(void);
+extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
+extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
+extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
+extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
+extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
+			       struct net_device *dev, u32 *spec_dst, u32 *itag);
+extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
+
+/* Exported by fib_semantics.c */
+extern int ip_fib_check_default(u32 gw, struct net_device *dev);
+extern int fib_sync_down(u32 local, struct net_device *dev, int force);
+extern int fib_sync_up(struct net_device *dev);
+extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
+			       struct kern_rta *rta, struct rtentry *r);
+extern u32  __fib_res_prefsrc(struct fib_result *res);
+
+/* Exported by fib_hash.c */
+extern struct fib_table *fib_hash_init(int id);
+
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+/* Exported by fib_rules.c */
+
+extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
+extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
+extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);
+#ifdef CONFIG_NET_CLS_ROUTE
+extern u32 fib_rules_tclass(struct fib_result *res);
+#endif
+extern void fib_rules_init(void);
+#endif
+
+static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
+{
+#ifdef CONFIG_NET_CLS_ROUTE
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+	u32 rtag;
+#endif
+	*itag = FIB_RES_NH(*res).nh_tclassid<<16;
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+	rtag = fib_rules_tclass(res);
+	if (*itag == 0)
+		*itag = (rtag<<16);
+	*itag |= (rtag>>16);
+#endif
+#endif
+}
+
+extern 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);
+}
+
+static inline void fib_res_put(struct fib_result *res)
+{
+	if (res->fi)
+		fib_info_put(res->fi);
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+	if (res->r)
+		fib_rule_put(res->r);
+#endif
+}
+
+#endif  /* _NET_FIB_H */