/* * 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, <bir7@leland.Stanford.Edu> * 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 <linux/config.h> #include <net/dst.h> #include <net/inetpeer.h> #include <net/flow.h> #include <linux/in_route.h> #include <linux/rtnetlink.h> #include <linux/route.h> #include <linux/ip.h> #include <linux/cache.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) | sk->localroute) struct inet_peer; struct rtable { union { struct dst_entry dst; struct rtable *rt_next; } u; unsigned rt_flags; unsigned rt_type; __u32 rt_dst; /* Path destination */ __u32 rt_src; /* Path source */ int rt_iif; /* Info on neighbour */ __u32 rt_gateway; /* Cache lookup keys */ struct flowi fl; /* Miscellaneous cached information */ __u32 rt_spec_dst; /* RFC1122 specific destination */ struct inet_peer *peer; /* long-living peer info */ #ifdef CONFIG_IP_ROUTE_NAT __u32 rt_src_map; __u32 rt_dst_map; #endif }; 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; } ____cacheline_aligned_in_smp; extern struct ip_rt_acct *ip_rt_acct; struct in_device; extern void ip_rt_init(void); extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw, u32 src, u8 tos, struct net_device *dev); extern void ip_rt_advice(struct rtable **rp, int advice); extern void rt_cache_flush(int how); extern int ip_route_output_key(struct rtable **, const struct flowi *flp); extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin); extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu); extern void ip_rt_update_pmtu(struct dst_entry *dst, unsigned mtu); extern void ip_rt_send_redirect(struct sk_buff *skb); extern unsigned inet_addr_type(u32 addr); extern void ip_rt_multicast_event(struct in_device *); extern int ip_rt_ioctl(unsigned int cmd, void *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); 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 __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, u32 dst, u32 src, u32 tos, int oif, u8 protocol, u16 sport, u16 dport) { struct flowi fl = { .oif = oif, .nl_u = { .ip4_u = { .daddr = dst, .saddr = src, .tos = tos } }, .proto = protocol, .uli_u = { .ports = { .sport = sport, .dport = dport } } }; int err; err = ip_route_output_key(rp, &fl); if (err || (dst && src)) return err; fl.fl4_dst = (*rp)->rt_dst; fl.fl4_src = (*rp)->rt_src; ip_rt_put(*rp); *rp = NULL; return ip_route_output_key(rp, &fl); } static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport) { if (sport != (*rp)->fl.uli_u.ports.sport || dport != (*rp)->fl.uli_u.ports.dport) { struct flowi fl; memcpy(&fl, &(*rp)->fl, sizeof(fl)); fl.uli_u.ports.sport = sport; fl.uli_u.ports.dport = dport; *rp = NULL; return ip_route_output_key(rp, &fl); } 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; } #endif /* _ROUTE_H */