/* * 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 IP router. * * Version: @(#)route.h 1.0.4 05/27/93 * * Authors: Ross Biro * Fred N. van Kempen, * Fixes: * Alan Cox : Reformatted. Added ip_rt_local() * Alan Cox : Support for TCP parameters. * Alexey Kuznetsov: Major changes for new routing code. * Mike McLagan : Routing by source * Robert Olsson : Added rt_cache statistics * * 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 _ROUTE_H #define _ROUTE_H #include #include #include #include #include #include #include #include #include #include #define RTO_ONLINK 0x01 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) struct fib_nh; struct inet_peer; struct fib_info; struct rtable { struct dst_entry dst; /* Lookup key. */ __be32 rt_key_dst; __be32 rt_key_src; int rt_genid; unsigned rt_flags; __u16 rt_type; __u8 rt_tos; __be32 rt_dst; /* Path destination */ __be32 rt_src; /* Path source */ int rt_route_iif; int rt_iif; int rt_oif; __u32 rt_mark; /* Info on neighbour */ __be32 rt_gateway; /* Miscellaneous cached information */ __be32 rt_spec_dst; /* RFC1122 specific destination */ u32 rt_peer_genid; struct inet_peer *peer; /* long-living peer info */ struct fib_info *fi; /* for client ref to shared metrics */ }; static inline bool rt_is_input_route(struct rtable *rt) { return rt->rt_route_iif != 0; } static inline bool rt_is_output_route(struct rtable *rt) { return rt->rt_route_iif == 0; } struct ip_rt_acct { __u32 o_bytes; __u32 o_packets; __u32 i_bytes; __u32 i_packets; }; struct rt_cache_stat { unsigned int in_hit; unsigned int in_slow_tot; unsigned int in_slow_mc; unsigned int in_no_route; unsigned int in_brd; unsigned int in_martian_dst; unsigned int in_martian_src; unsigned int out_hit; unsigned int out_slow_tot; unsigned int out_slow_mc; unsigned int gc_total; unsigned int gc_ignored; unsigned int gc_goal_miss; unsigned int gc_dst_overflow; unsigned int in_hlist_search; unsigned int out_hlist_search; }; extern struct ip_rt_acct __percpu *ip_rt_acct; struct in_device; extern int ip_rt_init(void); extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, __be32 src, struct net_device *dev); extern void rt_cache_flush(struct net *net, int how); extern void rt_cache_flush_batch(struct net *net); extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp); extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, struct sock *sk); extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig); static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp) { return ip_route_output_flow(net, flp, NULL); } static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, __be32 saddr, u8 tos, int oif) { struct flowi4 fl4 = { .flowi4_oif = oif, .daddr = daddr, .saddr = saddr, .flowi4_tos = tos, }; return ip_route_output_key(net, &fl4); } static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk, __be32 daddr, __be32 saddr, __be16 dport, __be16 sport, __u8 proto, __u8 tos, int oif) { struct flowi4 fl4; flowi4_init_output(&fl4, oif, sk ? sk->sk_mark : 0, tos, RT_SCOPE_UNIVERSE, proto, sk ? inet_sk_flowi_flags(sk) : 0, daddr, saddr, dport, sport); if (sk) security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); return ip_route_output_flow(net, &fl4, sk); } static inline struct rtable *ip_route_output_gre(struct net *net, __be32 daddr, __be32 saddr, __be32 gre_key, __u8 tos, int oif) { struct flowi4 fl4 = { .flowi4_oif = oif, .daddr = daddr, .saddr = saddr, .flowi4_tos = tos, .flowi4_proto = IPPROTO_GRE, .fl4_gre_key = gre_key, }; return ip_route_output_key(net, &fl4); } extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, u8 tos, struct net_device *devin, bool noref); static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, u8 tos, struct net_device *devin) { return ip_route_input_common(skb, dst, src, tos, devin, false); } static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, u8 tos, struct net_device *devin) { return ip_route_input_common(skb, dst, src, tos, devin, true); } extern unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); extern void ip_rt_send_redirect(struct sk_buff *skb); extern unsigned inet_addr_type(struct net *net, __be32 addr); extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); extern void ip_rt_multicast_event(struct in_device *); extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); extern void ip_rt_get_source(u8 *src, struct rtable *rt); extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); struct in_ifaddr; extern void fib_add_ifaddr(struct in_ifaddr *); extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); static inline void ip_rt_put(struct rtable * rt) { if (rt) dst_release(&rt->dst); } #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) extern const __u8 ip_tos2prio[16]; static inline char rt_tos2priority(u8 tos) { return ip_tos2prio[IPTOS_TOS(tos)>>1]; } /* ip_route_connect() and ip_route_newports() work in tandem whilst * binding a socket for a new outgoing connection. * * In order to use IPSEC properly, we must, in the end, have a * route that was looked up using all available keys including source * and destination ports. * * However, if a source port needs to be allocated (the user specified * a wildcard source port) we need to obtain addressing information * in order to perform that allocation. * * So ip_route_connect() looks up a route using wildcarded source and * destination ports in the key, simply so that we can get a pair of * addresses to use for port allocation. * * Later, once the ports are allocated, ip_route_newports() will make * another route lookup if needed to make sure we catch any IPSEC * rules keyed on the port information. * * The callers allocate the flow key on their stack, and must pass in * the same flowi4 object to both the ip_route_connect() and the * ip_route_newports() calls. */ static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, u32 tos, int oif, u8 protocol, __be16 sport, __be16 dport, struct sock *sk, bool can_sleep) { __u8 flow_flags = 0; if (inet_sk(sk)->transparent) flow_flags |= FLOWI_FLAG_ANYSRC; if (protocol == IPPROTO_TCP) flow_flags |= FLOWI_FLAG_PRECOW_METRICS; if (can_sleep) flow_flags |= FLOWI_FLAG_CAN_SLEEP; flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE, protocol, flow_flags, dst, src, dport, sport); } static inline struct rtable *ip_route_connect(struct flowi4 *fl4, __be32 dst, __be32 src, u32 tos, int oif, u8 protocol, __be16 sport, __be16 dport, struct sock *sk, bool can_sleep) { struct net *net = sock_net(sk); struct rtable *rt; ip_route_connect_init(fl4, dst, src, tos, oif, protocol, sport, dport, sk, can_sleep); if (!dst || !src) { rt = __ip_route_output_key(net, fl4); if (IS_ERR(rt)) return rt; ip_rt_put(rt); } security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); return ip_route_output_flow(net, fl4, sk); } static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, __be16 orig_sport, __be16 orig_dport, __be16 sport, __be16 dport, struct sock *sk) { if (sport != orig_sport || dport != orig_dport) { fl4->fl4_dport = dport; fl4->fl4_sport = sport; ip_rt_put(rt); security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); return ip_route_output_flow(sock_net(sk), fl4, sk); } return rt; } extern void rt_bind_peer(struct rtable *rt, int create); static inline struct inet_peer *rt_get_peer(struct rtable *rt) { if (rt->peer) return rt->peer; rt_bind_peer(rt, 0); return rt->peer; } static inline int inet_iif(const struct sk_buff *skb) { return skb_rtable(skb)->rt_iif; } extern int sysctl_ip_default_ttl; static inline int ip4_dst_hoplimit(const struct dst_entry *dst) { int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); if (hoplimit == 0) hoplimit = sysctl_ip_default_ttl; return hoplimit; } #endif /* _ROUTE_H */