route.h revision f1b050bf7a88910f9f00c9c8989c1bf5a67dd140
1/* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the IP router. 7 * 8 * Version: @(#)route.h 1.0.4 05/27/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Fixes: 13 * Alan Cox : Reformatted. Added ip_rt_local() 14 * Alan Cox : Support for TCP parameters. 15 * Alexey Kuznetsov: Major changes for new routing code. 16 * Mike McLagan : Routing by source 17 * Robert Olsson : Added rt_cache statistics 18 * 19 * This program is free software; you can redistribute it and/or 20 * modify it under the terms of the GNU General Public License 21 * as published by the Free Software Foundation; either version 22 * 2 of the License, or (at your option) any later version. 23 */ 24#ifndef _ROUTE_H 25#define _ROUTE_H 26 27#include <net/dst.h> 28#include <net/inetpeer.h> 29#include <net/flow.h> 30#include <linux/in_route.h> 31#include <linux/rtnetlink.h> 32#include <linux/route.h> 33#include <linux/ip.h> 34#include <linux/cache.h> 35#include <linux/security.h> 36 37#ifndef __KERNEL__ 38#warning This file is not supposed to be used outside of kernel. 39#endif 40 41#define RTO_ONLINK 0x01 42 43#define RTO_CONN 0 44/* RTO_CONN is not used (being alias for 0), but preserved not to break 45 * some modules referring to it. */ 46 47#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) 48 49struct fib_nh; 50struct inet_peer; 51struct rtable 52{ 53 union 54 { 55 struct dst_entry dst; 56 } u; 57 58 /* Cache lookup keys */ 59 struct flowi fl; 60 61 struct in_device *idev; 62 63 unsigned rt_flags; 64 __u16 rt_type; 65 66 __be32 rt_dst; /* Path destination */ 67 __be32 rt_src; /* Path source */ 68 int rt_iif; 69 70 /* Info on neighbour */ 71 __be32 rt_gateway; 72 73 /* Miscellaneous cached information */ 74 __be32 rt_spec_dst; /* RFC1122 specific destination */ 75 struct inet_peer *peer; /* long-living peer info */ 76}; 77 78struct ip_rt_acct 79{ 80 __u32 o_bytes; 81 __u32 o_packets; 82 __u32 i_bytes; 83 __u32 i_packets; 84}; 85 86struct rt_cache_stat 87{ 88 unsigned int in_hit; 89 unsigned int in_slow_tot; 90 unsigned int in_slow_mc; 91 unsigned int in_no_route; 92 unsigned int in_brd; 93 unsigned int in_martian_dst; 94 unsigned int in_martian_src; 95 unsigned int out_hit; 96 unsigned int out_slow_tot; 97 unsigned int out_slow_mc; 98 unsigned int gc_total; 99 unsigned int gc_ignored; 100 unsigned int gc_goal_miss; 101 unsigned int gc_dst_overflow; 102 unsigned int in_hlist_search; 103 unsigned int out_hlist_search; 104}; 105 106extern struct ip_rt_acct *ip_rt_acct; 107 108struct in_device; 109extern int ip_rt_init(void); 110extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, 111 __be32 src, struct net_device *dev); 112extern void rt_cache_flush(int how); 113extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); 114extern int ip_route_output_key(struct rtable **, struct flowi *flp); 115extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); 116extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin); 117extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu); 118extern void ip_rt_send_redirect(struct sk_buff *skb); 119 120extern unsigned inet_addr_type(struct net *net, __be32 addr); 121extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); 122extern void ip_rt_multicast_event(struct in_device *); 123extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); 124extern void ip_rt_get_source(u8 *src, struct rtable *rt); 125extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); 126 127struct in_ifaddr; 128extern void fib_add_ifaddr(struct in_ifaddr *); 129 130static inline void ip_rt_put(struct rtable * rt) 131{ 132 if (rt) 133 dst_release(&rt->u.dst); 134} 135 136#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) 137 138extern const __u8 ip_tos2prio[16]; 139 140static inline char rt_tos2priority(u8 tos) 141{ 142 return ip_tos2prio[IPTOS_TOS(tos)>>1]; 143} 144 145static inline int ip_route_connect(struct rtable **rp, __be32 dst, 146 __be32 src, u32 tos, int oif, u8 protocol, 147 __be16 sport, __be16 dport, struct sock *sk, 148 int flags) 149{ 150 struct flowi fl = { .oif = oif, 151 .nl_u = { .ip4_u = { .daddr = dst, 152 .saddr = src, 153 .tos = tos } }, 154 .proto = protocol, 155 .uli_u = { .ports = 156 { .sport = sport, 157 .dport = dport } } }; 158 159 int err; 160 if (!dst || !src) { 161 err = __ip_route_output_key(&init_net, rp, &fl); 162 if (err) 163 return err; 164 fl.fl4_dst = (*rp)->rt_dst; 165 fl.fl4_src = (*rp)->rt_src; 166 ip_rt_put(*rp); 167 *rp = NULL; 168 } 169 security_sk_classify_flow(sk, &fl); 170 return ip_route_output_flow(&init_net, rp, &fl, sk, flags); 171} 172 173static inline int ip_route_newports(struct rtable **rp, u8 protocol, 174 __be16 sport, __be16 dport, struct sock *sk) 175{ 176 if (sport != (*rp)->fl.fl_ip_sport || 177 dport != (*rp)->fl.fl_ip_dport) { 178 struct flowi fl; 179 180 memcpy(&fl, &(*rp)->fl, sizeof(fl)); 181 fl.fl_ip_sport = sport; 182 fl.fl_ip_dport = dport; 183 fl.proto = protocol; 184 ip_rt_put(*rp); 185 *rp = NULL; 186 security_sk_classify_flow(sk, &fl); 187 return ip_route_output_flow(&init_net, rp, &fl, sk, 0); 188 } 189 return 0; 190} 191 192extern void rt_bind_peer(struct rtable *rt, int create); 193 194static inline struct inet_peer *rt_get_peer(struct rtable *rt) 195{ 196 if (rt->peer) 197 return rt->peer; 198 199 rt_bind_peer(rt, 0); 200 return rt->peer; 201} 202 203extern ctl_table ipv4_route_table[]; 204 205#endif /* _ROUTE_H */ 206