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 <net/sock.h> 31 #include <linux/in_route.h> 32 #include <linux/rtnetlink.h> 33 #include <linux/route.h> 34 #include <linux/ip.h> 35 #include <linux/cache.h> 36 #include <linux/security.h> 37 #include <net/sock.h> 38 39 #ifndef __KERNEL__ 40 #warning This file is not supposed to be used outside of kernel. 41 #endif 42 43 #define RTO_ONLINK 0x01 44 45 #define RTO_CONN 0 46 /* RTO_CONN is not used (being alias for 0), but preserved not to break 47 * some modules referring to it. */ 48 49 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) 50 51 struct fib_nh; 52 struct inet_peer; 53 struct rtable 54 { 55 union 56 { 57 struct dst_entry dst; 58 } u; 59 60 /* Cache lookup keys */ 61 struct flowi fl; 62 63 struct in_device *idev; 64 65 unsigned rt_flags; 66 __u16 rt_type; 67 68 __be32 rt_dst; /* Path destination */ 69 __be32 rt_src; /* Path source */ 70 int rt_iif; 71 72 /* Info on neighbour */ 73 __be32 rt_gateway; 74 75 /* Miscellaneous cached information */ 76 __be32 rt_spec_dst; /* RFC1122 specific destination */ 77 struct inet_peer *peer; /* long-living peer info */ 78 }; 79 80 struct ip_rt_acct 81 { 82 __u32 o_bytes; 83 __u32 o_packets; 84 __u32 i_bytes; 85 __u32 i_packets; 86 }; 87 88 struct rt_cache_stat 89 { 90 unsigned int in_hit; 91 unsigned int in_slow_tot; 92 unsigned int in_slow_mc; 93 unsigned int in_no_route; 94 unsigned int in_brd; 95 unsigned int in_martian_dst; 96 unsigned int in_martian_src; 97 unsigned int out_hit; 98 unsigned int out_slow_tot; 99 unsigned int out_slow_mc; 100 unsigned int gc_total; 101 unsigned int gc_ignored; 102 unsigned int gc_goal_miss; 103 unsigned int gc_dst_overflow; 104 unsigned int in_hlist_search; 105 unsigned int out_hlist_search; 106 }; 107 108 extern struct ip_rt_acct *ip_rt_acct; 109 110 struct in_device; 111 extern int ip_rt_init(void); 112 extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, 113 __be32 src, struct net_device *dev); 114 extern void rt_cache_flush(int how); 115 extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); 116 extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); 117 extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); 118 extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin); 119 extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu); 120 extern void ip_rt_send_redirect(struct sk_buff *skb); 121 122 extern unsigned inet_addr_type(struct net *net, __be32 addr); 123 extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); 124 extern void ip_rt_multicast_event(struct in_device *); 125 extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); 126 extern void ip_rt_get_source(u8 *src, struct rtable *rt); 127 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); 128 129 struct in_ifaddr; 130 extern void fib_add_ifaddr(struct in_ifaddr *); 131 132 static inline void ip_rt_put(struct rtable * rt) 133 { 134 if (rt) 135 dst_release(&rt->u.dst); 136 } 137 138 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) 139 140 extern const __u8 ip_tos2prio[16]; 141 142 static inline char rt_tos2priority(u8 tos) 143 { 144 return ip_tos2prio[IPTOS_TOS(tos)>>1]; 145 } 146 147 static inline int ip_route_connect(struct rtable **rp, __be32 dst, 148 __be32 src, u32 tos, int oif, u8 protocol, 149 __be16 sport, __be16 dport, struct sock *sk, 150 int flags) 151 { 152 struct flowi fl = { .oif = oif, 153 .mark = sk->sk_mark, 154 .nl_u = { .ip4_u = { .daddr = dst, 155 .saddr = src, 156 .tos = tos } }, 157 .proto = protocol, 158 .uli_u = { .ports = 159 { .sport = sport, 160 .dport = dport } } }; 161 162 int err; 163 struct net *net = sk->sk_net; 164 if (!dst || !src) { 165 err = __ip_route_output_key(net, rp, &fl); 166 if (err) 167 return err; 168 fl.fl4_dst = (*rp)->rt_dst; 169 fl.fl4_src = (*rp)->rt_src; 170 ip_rt_put(*rp); 171 *rp = NULL; 172 } 173 security_sk_classify_flow(sk, &fl); 174 return ip_route_output_flow(net, rp, &fl, sk, flags); 175 } 176 177 static inline int ip_route_newports(struct rtable **rp, u8 protocol, 178 __be16 sport, __be16 dport, struct sock *sk) 179 { 180 if (sport != (*rp)->fl.fl_ip_sport || 181 dport != (*rp)->fl.fl_ip_dport) { 182 struct flowi fl; 183 184 memcpy(&fl, &(*rp)->fl, sizeof(fl)); 185 fl.fl_ip_sport = sport; 186 fl.fl_ip_dport = dport; 187 fl.proto = protocol; 188 ip_rt_put(*rp); 189 *rp = NULL; 190 security_sk_classify_flow(sk, &fl); 191 return ip_route_output_flow(sk->sk_net, rp, &fl, sk, 0); 192 } 193 return 0; 194 } 195 196 extern void rt_bind_peer(struct rtable *rt, int create); 197 198 static inline struct inet_peer *rt_get_peer(struct rtable *rt) 199 { 200 if (rt->peer) 201 return rt->peer; 202 203 rt_bind_peer(rt, 0); 204 return rt->peer; 205 } 206 207 extern ctl_table ipv4_route_table[]; 208 209 #endif /* _ROUTE_H */ 210