11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Definitions for the IP router. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Version: @(#)route.h 1.0.4 05/27/93 91da177e4SLinus Torvalds * 1002c30a84SJesper Juhl * Authors: Ross Biro 111da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 121da177e4SLinus Torvalds * Fixes: 131da177e4SLinus Torvalds * Alan Cox : Reformatted. Added ip_rt_local() 141da177e4SLinus Torvalds * Alan Cox : Support for TCP parameters. 151da177e4SLinus Torvalds * Alexey Kuznetsov: Major changes for new routing code. 161da177e4SLinus Torvalds * Mike McLagan : Routing by source 171da177e4SLinus Torvalds * Robert Olsson : Added rt_cache statistics 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 201da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 211da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 221da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 231da177e4SLinus Torvalds */ 241da177e4SLinus Torvalds #ifndef _ROUTE_H 251da177e4SLinus Torvalds #define _ROUTE_H 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <net/dst.h> 281da177e4SLinus Torvalds #include <net/inetpeer.h> 291da177e4SLinus Torvalds #include <net/flow.h> 3079876874SKOVACS Krisztian #include <net/inet_sock.h> 311da177e4SLinus Torvalds #include <linux/in_route.h> 321da177e4SLinus Torvalds #include <linux/rtnetlink.h> 331da177e4SLinus Torvalds #include <linux/route.h> 341da177e4SLinus Torvalds #include <linux/ip.h> 351da177e4SLinus Torvalds #include <linux/cache.h> 36beb8d13bSVenkat Yekkirala #include <linux/security.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #ifndef __KERNEL__ 391da177e4SLinus Torvalds #warning This file is not supposed to be used outside of kernel. 401da177e4SLinus Torvalds #endif 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #define RTO_ONLINK 0x01 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #define RTO_CONN 0 451da177e4SLinus Torvalds /* RTO_CONN is not used (being alias for 0), but preserved not to break 461da177e4SLinus Torvalds * some modules referring to it. */ 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds struct fib_nh; 511da177e4SLinus Torvalds struct inet_peer; 52fd2c3ef7SEric Dumazet struct rtable { 531da177e4SLinus Torvalds struct dst_entry dst; 541da177e4SLinus Torvalds 55093c2ca4SEric Dumazet /* Cache lookup keys */ 56093c2ca4SEric Dumazet struct flowi fl; 57093c2ca4SEric Dumazet 5829e75252SEric Dumazet int rt_genid; 591da177e4SLinus Torvalds unsigned rt_flags; 601da177e4SLinus Torvalds __u16 rt_type; 611da177e4SLinus Torvalds 62f2c3fe24SAl Viro __be32 rt_dst; /* Path destination */ 63f2c3fe24SAl Viro __be32 rt_src; /* Path source */ 641da177e4SLinus Torvalds int rt_iif; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds /* Info on neighbour */ 67f2c3fe24SAl Viro __be32 rt_gateway; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds /* Miscellaneous cached information */ 70f2c3fe24SAl Viro __be32 rt_spec_dst; /* RFC1122 specific destination */ 711da177e4SLinus Torvalds struct inet_peer *peer; /* long-living peer info */ 721da177e4SLinus Torvalds }; 731da177e4SLinus Torvalds 74c7537967SDavid S. Miller static inline bool rt_is_input_route(struct rtable *rt) 75c7537967SDavid S. Miller { 76c7537967SDavid S. Miller return rt->fl.iif != 0; 77c7537967SDavid S. Miller } 78c7537967SDavid S. Miller 79c7537967SDavid S. Miller static inline bool rt_is_output_route(struct rtable *rt) 80c7537967SDavid S. Miller { 81c7537967SDavid S. Miller return rt->fl.iif == 0; 82c7537967SDavid S. Miller } 83c7537967SDavid S. Miller 84fd2c3ef7SEric Dumazet struct ip_rt_acct { 851da177e4SLinus Torvalds __u32 o_bytes; 861da177e4SLinus Torvalds __u32 o_packets; 871da177e4SLinus Torvalds __u32 i_bytes; 881da177e4SLinus Torvalds __u32 i_packets; 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 91fd2c3ef7SEric Dumazet struct rt_cache_stat { 921da177e4SLinus Torvalds unsigned int in_hit; 931da177e4SLinus Torvalds unsigned int in_slow_tot; 941da177e4SLinus Torvalds unsigned int in_slow_mc; 951da177e4SLinus Torvalds unsigned int in_no_route; 961da177e4SLinus Torvalds unsigned int in_brd; 971da177e4SLinus Torvalds unsigned int in_martian_dst; 981da177e4SLinus Torvalds unsigned int in_martian_src; 991da177e4SLinus Torvalds unsigned int out_hit; 1001da177e4SLinus Torvalds unsigned int out_slow_tot; 1011da177e4SLinus Torvalds unsigned int out_slow_mc; 1021da177e4SLinus Torvalds unsigned int gc_total; 1031da177e4SLinus Torvalds unsigned int gc_ignored; 1041da177e4SLinus Torvalds unsigned int gc_goal_miss; 1051da177e4SLinus Torvalds unsigned int gc_dst_overflow; 1061da177e4SLinus Torvalds unsigned int in_hlist_search; 1071da177e4SLinus Torvalds unsigned int out_hlist_search; 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1107d720c3eSTejun Heo extern struct ip_rt_acct __percpu *ip_rt_acct; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds struct in_device; 1131da177e4SLinus Torvalds extern int ip_rt_init(void); 114f7655229SAl Viro extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, 115f7655229SAl Viro __be32 src, struct net_device *dev); 11676e6ebfbSDenis V. Lunev extern void rt_cache_flush(struct net *net, int how); 117a5ee1551SEric W. Biederman extern void rt_cache_flush_batch(void); 118611c183eSDenis V. Lunev extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); 119f206351aSDenis V. Lunev extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); 120f1b050bfSDenis V. Lunev extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); 121407eadd9SEric Dumazet 122407eadd9SEric Dumazet extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, 123407eadd9SEric Dumazet u8 tos, struct net_device *devin, bool noref); 124407eadd9SEric Dumazet 125407eadd9SEric Dumazet static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, 126407eadd9SEric Dumazet u8 tos, struct net_device *devin) 127407eadd9SEric Dumazet { 128407eadd9SEric Dumazet return ip_route_input_common(skb, dst, src, tos, devin, false); 129407eadd9SEric Dumazet } 130407eadd9SEric Dumazet 131407eadd9SEric Dumazet static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, 132407eadd9SEric Dumazet u8 tos, struct net_device *devin) 133407eadd9SEric Dumazet { 134407eadd9SEric Dumazet return ip_route_input_common(skb, dst, src, tos, devin, true); 135407eadd9SEric Dumazet } 136407eadd9SEric Dumazet 1370010e465STimo Teras extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); 1381da177e4SLinus Torvalds extern void ip_rt_send_redirect(struct sk_buff *skb); 1391da177e4SLinus Torvalds 1406b175b26SEric W. Biederman extern unsigned inet_addr_type(struct net *net, __be32 addr); 1416b175b26SEric W. Biederman extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); 1421da177e4SLinus Torvalds extern void ip_rt_multicast_event(struct in_device *); 1431bad118aSDenis V. Lunev extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); 1441da177e4SLinus Torvalds extern void ip_rt_get_source(u8 *src, struct rtable *rt); 1451da177e4SLinus Torvalds extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); 1461da177e4SLinus Torvalds 1470ff60a45SJamal Hadi Salim struct in_ifaddr; 1480ff60a45SJamal Hadi Salim extern void fib_add_ifaddr(struct in_ifaddr *); 1490ff60a45SJamal Hadi Salim 1501da177e4SLinus Torvalds static inline void ip_rt_put(struct rtable * rt) 1511da177e4SLinus Torvalds { 1521da177e4SLinus Torvalds if (rt) 153d8d1f30bSChangli Gao dst_release(&rt->dst); 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) 1571da177e4SLinus Torvalds 1584839c52bSPhilippe De Muyter extern const __u8 ip_tos2prio[16]; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static inline char rt_tos2priority(u8 tos) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds return ip_tos2prio[IPTOS_TOS(tos)>>1]; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 165bada8adcSAl Viro static inline int ip_route_connect(struct rtable **rp, __be32 dst, 166bada8adcSAl Viro __be32 src, u32 tos, int oif, u8 protocol, 1678eb9086fSDavid S. Miller __be16 sport, __be16 dport, struct sock *sk, 1688eb9086fSDavid S. Miller int flags) 1691da177e4SLinus Torvalds { 1701da177e4SLinus Torvalds struct flowi fl = { .oif = oif, 1714a19ec58SLaszlo Attila Toth .mark = sk->sk_mark, 1725811662bSChangli Gao .fl4_dst = dst, 1735811662bSChangli Gao .fl4_src = src, 1745811662bSChangli Gao .fl4_tos = tos, 1751da177e4SLinus Torvalds .proto = protocol, 1765811662bSChangli Gao .fl_ip_sport = sport, 1775811662bSChangli Gao .fl_ip_dport = dport }; 1781da177e4SLinus Torvalds int err; 1793b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 18079876874SKOVACS Krisztian 18179876874SKOVACS Krisztian if (inet_sk(sk)->transparent) 18279876874SKOVACS Krisztian fl.flags |= FLOWI_FLAG_ANYSRC; 18379876874SKOVACS Krisztian 1841da177e4SLinus Torvalds if (!dst || !src) { 185eee80592SDenis V. Lunev err = __ip_route_output_key(net, rp, &fl); 1861da177e4SLinus Torvalds if (err) 1871da177e4SLinus Torvalds return err; 1881da177e4SLinus Torvalds fl.fl4_dst = (*rp)->rt_dst; 1891da177e4SLinus Torvalds fl.fl4_src = (*rp)->rt_src; 1901da177e4SLinus Torvalds ip_rt_put(*rp); 1911da177e4SLinus Torvalds *rp = NULL; 1921da177e4SLinus Torvalds } 193beb8d13bSVenkat Yekkirala security_sk_classify_flow(sk, &fl); 194eee80592SDenis V. Lunev return ip_route_output_flow(net, rp, &fl, sk, flags); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1975d39a795SPatrick McHardy static inline int ip_route_newports(struct rtable **rp, u8 protocol, 19839dccd9dSAl Viro __be16 sport, __be16 dport, struct sock *sk) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds if (sport != (*rp)->fl.fl_ip_sport || 2011da177e4SLinus Torvalds dport != (*rp)->fl.fl_ip_dport) { 2021da177e4SLinus Torvalds struct flowi fl; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds memcpy(&fl, &(*rp)->fl, sizeof(fl)); 2051da177e4SLinus Torvalds fl.fl_ip_sport = sport; 2061da177e4SLinus Torvalds fl.fl_ip_dport = dport; 2075d39a795SPatrick McHardy fl.proto = protocol; 208fb0c5f0bSUlrich Weber if (inet_sk(sk)->transparent) 209fb0c5f0bSUlrich Weber fl.flags |= FLOWI_FLAG_ANYSRC; 2101da177e4SLinus Torvalds ip_rt_put(*rp); 2111da177e4SLinus Torvalds *rp = NULL; 212beb8d13bSVenkat Yekkirala security_sk_classify_flow(sk, &fl); 2133b1e0a65SYOSHIFUJI Hideaki return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds return 0; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds extern void rt_bind_peer(struct rtable *rt, int create); 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static inline struct inet_peer *rt_get_peer(struct rtable *rt) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds if (rt->peer) 2231da177e4SLinus Torvalds return rt->peer; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds rt_bind_peer(rt, 0); 2261da177e4SLinus Torvalds return rt->peer; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291668e010SKOVACS Krisztian static inline int inet_iif(const struct sk_buff *skb) 2301668e010SKOVACS Krisztian { 231511c3f92SEric Dumazet return skb_rtable(skb)->rt_iif; 2321668e010SKOVACS Krisztian } 2331668e010SKOVACS Krisztian 234323e126fSDavid S. Miller extern int sysctl_ip_default_ttl; 235323e126fSDavid S. Miller 236323e126fSDavid S. Miller static inline int ip4_dst_hoplimit(const struct dst_entry *dst) 237323e126fSDavid S. Miller { 238323e126fSDavid S. Miller int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); 239323e126fSDavid S. Miller 240323e126fSDavid S. Miller if (hoplimit == 0) 241323e126fSDavid S. Miller hoplimit = sysctl_ip_default_ttl; 242323e126fSDavid S. Miller return hoplimit; 243323e126fSDavid S. Miller } 244323e126fSDavid S. Miller 2451da177e4SLinus Torvalds #endif /* _ROUTE_H */ 246