/* * 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 }; struct fib_result_nl { u32 fl_addr; /* To be looked up*/ u32 fl_fwmark; 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]) #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); struct rtentry; /* 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 } #ifdef CONFIG_PROC_FS extern int fib_proc_init(void); extern void fib_proc_exit(void); #endif #endif /* _NET_FIB_H */