/* * 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, <waltje@uWalt.NL.Mugnet.ORG> * 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 <net/dst.h> #include <net/inetpeer.h> #include <net/flow.h> #include <net/inet_sock.h> #include <linux/in_route.h> #include <linux/rtnetlink.h> #include <linux/route.h> #include <linux/ip.h> #include <linux/cache.h> #include <linux/security.h> #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 rtable { union { struct dst_entry dst; } u; /* Cache lookup keys */ struct flowi fl; struct in_device *idev; int rt_genid; unsigned rt_flags; __u16 rt_type; __be32 rt_dst; /* Path destination */ __be32 rt_src; /* Path source */ int rt_iif; /* Info on neighbour */ __be32 rt_gateway; /* Miscellaneous cached information */ __be32 rt_spec_dst; /* RFC1122 specific destination */ struct inet_peer *peer; /* long-living peer info */ }; 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 *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 int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin); 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->u.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 int ip_route_connect(struct rtable **rp, __be32 dst, __be32 src, u32 tos, int oif, u8 protocol, __be16 sport, __be16 dport, struct sock *sk, int flags) { struct flowi fl = { .oif = oif, .mark = sk->sk_mark, .nl_u = { .ip4_u = { .daddr = dst, .saddr = src, .tos = tos } }, .proto = protocol, .uli_u = { .ports = { .sport = sport, .dport = dport } } }; int err; struct net *net = sock_net(sk); if (inet_sk(sk)->transparent) fl.flags |= FLOWI_FLAG_ANYSRC; if (!dst || !src) { err = __ip_route_output_key(net, rp, &fl); if (err) return err; fl.fl4_dst = (*rp)->rt_dst; fl.fl4_src = (*rp)->rt_src; ip_rt_put(*rp); *rp = NULL; } security_sk_classify_flow(sk, &fl); return ip_route_output_flow(net, rp, &fl, sk, flags); } static inline int ip_route_newports(struct rtable **rp, u8 protocol, __be16 sport, __be16 dport, struct sock *sk) { if (sport != (*rp)->fl.fl_ip_sport || dport != (*rp)->fl.fl_ip_dport) { struct flowi fl; memcpy(&fl, &(*rp)->fl, sizeof(fl)); fl.fl_ip_sport = sport; fl.fl_ip_dport = dport; fl.proto = protocol; ip_rt_put(*rp); *rp = NULL; security_sk_classify_flow(sk, &fl); return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); } return 0; } 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->rt_iif; } #endif /* _ROUTE_H */