/* * 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 #ifndef __KERNEL__ #warning This file is not supposed to be used outside of kernel. #endif #define RTO_ONLINK 0x01 #define RTO_CONN 0 /* RTO_CONN is not used (being alias for 0), but preserved not to break * some modules referring to it. */ #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_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_iif != 0; } static inline bool rt_is_output_route(struct rtable *rt) { return rt->rt_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 *, const 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_oif = oif, .flowi4_flags = sk ? inet_sk_flowi_flags(sk) : 0, .flowi4_mark = sk ? sk->sk_mark : 0, .daddr = daddr, .saddr = saddr, .flowi4_tos = tos, .flowi4_proto = proto, .fl4_dport = dport, .fl4_sport = 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, 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 *); 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]; } static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos, int oif, u8 protocol, __be16 sport, __be16 dport, struct sock *sk, bool can_sleep) { struct flowi4 fl4 = { .flowi4_oif = oif, .flowi4_mark = sk->sk_mark, .daddr = dst, .saddr = src, .flowi4_tos = tos, .flowi4_proto = protocol, .fl4_sport = sport, .fl4_dport = dport, }; struct net *net = sock_net(sk); struct rtable *rt; if (inet_sk(sk)->transparent) fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC; if (protocol == IPPROTO_TCP) fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS; if (can_sleep) fl4.flowi4_flags |= FLOWI_FLAG_CAN_SLEEP; if (!dst || !src) { rt = __ip_route_output_key(net, &fl4); if (IS_ERR(rt)) return rt; fl4.daddr = rt->rt_dst; fl4.saddr = rt->rt_src; 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 rtable *rt, u8 protocol, __be16 orig_sport, __be16 orig_dport, __be16 sport, __be16 dport, struct sock *sk) { if (sport != orig_sport || dport != orig_dport) { struct flowi4 fl4 = { .flowi4_oif = rt->rt_oif, .flowi4_mark = rt->rt_mark, .daddr = rt->rt_key_dst, .saddr = rt->rt_key_src, .flowi4_tos = rt->rt_tos, .flowi4_proto = protocol, .fl4_sport = sport, .fl4_dport = dport }; if (inet_sk(sk)->transparent) fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC; if (protocol == IPPROTO_TCP) fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS; 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 */