325 lines
9.4 KiB
C
325 lines
9.4 KiB
C
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the IP router.
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*
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* Version: @(#)route.h 1.0.4 05/27/93
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Fixes:
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* Alan Cox : Reformatted. Added ip_rt_local()
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* Alan Cox : Support for TCP parameters.
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* Alexey Kuznetsov: Major changes for new routing code.
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* Mike McLagan : Routing by source
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* Robert Olsson : Added rt_cache statistics
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ROUTE_H
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#define _ROUTE_H
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#include <net/dst.h>
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#include <net/inetpeer.h>
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#include <net/flow.h>
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#include <net/inet_sock.h>
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#include <linux/in_route.h>
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#include <linux/rtnetlink.h>
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#include <linux/route.h>
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#include <linux/ip.h>
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#include <linux/cache.h>
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#include <linux/security.h>
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#define RTO_ONLINK 0x01
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#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
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struct fib_nh;
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struct inet_peer;
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struct fib_info;
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struct rtable {
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struct dst_entry dst;
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/* Lookup key. */
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__be32 rt_key_dst;
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__be32 rt_key_src;
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int rt_genid;
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unsigned rt_flags;
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__u16 rt_type;
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__u8 rt_key_tos;
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__be32 rt_dst; /* Path destination */
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__be32 rt_src; /* Path source */
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int rt_route_iif;
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int rt_iif;
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int rt_oif;
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__u32 rt_mark;
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/* Info on neighbour */
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__be32 rt_gateway;
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/* Miscellaneous cached information */
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__be32 rt_spec_dst; /* RFC1122 specific destination */
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u32 rt_peer_genid;
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struct inet_peer *peer; /* long-living peer info */
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struct fib_info *fi; /* for client ref to shared metrics */
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};
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static inline bool rt_is_input_route(const struct rtable *rt)
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{
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return rt->rt_route_iif != 0;
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}
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static inline bool rt_is_output_route(const struct rtable *rt)
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{
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return rt->rt_route_iif == 0;
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}
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struct ip_rt_acct {
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__u32 o_bytes;
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__u32 o_packets;
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__u32 i_bytes;
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__u32 i_packets;
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};
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struct rt_cache_stat {
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unsigned int in_hit;
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unsigned int in_slow_tot;
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unsigned int in_slow_mc;
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unsigned int in_no_route;
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unsigned int in_brd;
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unsigned int in_martian_dst;
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unsigned int in_martian_src;
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unsigned int out_hit;
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unsigned int out_slow_tot;
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unsigned int out_slow_mc;
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unsigned int gc_total;
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unsigned int gc_ignored;
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unsigned int gc_goal_miss;
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unsigned int gc_dst_overflow;
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unsigned int in_hlist_search;
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unsigned int out_hlist_search;
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};
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extern struct ip_rt_acct __percpu *ip_rt_acct;
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struct in_device;
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extern int ip_rt_init(void);
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extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
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__be32 src, struct net_device *dev);
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extern void rt_cache_flush(struct net *net, int how);
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extern void rt_cache_flush_batch(struct net *net);
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extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp);
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extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
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struct sock *sk);
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extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig);
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static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
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{
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return ip_route_output_flow(net, flp, NULL);
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}
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static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
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__be32 saddr, u8 tos, int oif)
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{
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struct flowi4 fl4 = {
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.flowi4_oif = oif,
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.daddr = daddr,
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.saddr = saddr,
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.flowi4_tos = tos,
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};
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return ip_route_output_key(net, &fl4);
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}
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static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
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struct sock *sk,
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__be32 daddr, __be32 saddr,
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__be16 dport, __be16 sport,
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__u8 proto, __u8 tos, int oif)
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{
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flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
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RT_SCOPE_UNIVERSE, proto,
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sk ? inet_sk_flowi_flags(sk) : 0,
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daddr, saddr, dport, sport);
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if (sk)
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security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
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return ip_route_output_flow(net, fl4, sk);
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}
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static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
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__be32 daddr, __be32 saddr,
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__be32 gre_key, __u8 tos, int oif)
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{
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memset(fl4, 0, sizeof(*fl4));
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fl4->flowi4_oif = oif;
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fl4->daddr = daddr;
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fl4->saddr = saddr;
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fl4->flowi4_tos = tos;
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fl4->flowi4_proto = IPPROTO_GRE;
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fl4->fl4_gre_key = gre_key;
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return ip_route_output_key(net, fl4);
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}
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extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
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u8 tos, struct net_device *devin, bool noref);
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static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
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u8 tos, struct net_device *devin)
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{
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return ip_route_input_common(skb, dst, src, tos, devin, false);
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}
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static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
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u8 tos, struct net_device *devin)
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{
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return ip_route_input_common(skb, dst, src, tos, devin, true);
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}
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extern unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
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unsigned short new_mtu, struct net_device *dev);
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extern void ip_rt_send_redirect(struct sk_buff *skb);
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extern unsigned inet_addr_type(struct net *net, __be32 addr);
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extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
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extern void ip_rt_multicast_event(struct in_device *);
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extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
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extern void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
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extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
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struct in_ifaddr;
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extern void fib_add_ifaddr(struct in_ifaddr *);
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extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
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static inline void ip_rt_put(struct rtable * rt)
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{
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if (rt)
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dst_release(&rt->dst);
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}
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#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
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extern const __u8 ip_tos2prio[16];
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static inline char rt_tos2priority(u8 tos)
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{
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return ip_tos2prio[IPTOS_TOS(tos)>>1];
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}
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/* ip_route_connect() and ip_route_newports() work in tandem whilst
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* binding a socket for a new outgoing connection.
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*
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* In order to use IPSEC properly, we must, in the end, have a
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* route that was looked up using all available keys including source
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* and destination ports.
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*
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* However, if a source port needs to be allocated (the user specified
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* a wildcard source port) we need to obtain addressing information
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* in order to perform that allocation.
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*
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* So ip_route_connect() looks up a route using wildcarded source and
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* destination ports in the key, simply so that we can get a pair of
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* addresses to use for port allocation.
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*
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* Later, once the ports are allocated, ip_route_newports() will make
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* another route lookup if needed to make sure we catch any IPSEC
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* rules keyed on the port information.
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*
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* The callers allocate the flow key on their stack, and must pass in
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* the same flowi4 object to both the ip_route_connect() and the
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* ip_route_newports() calls.
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*/
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static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
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u32 tos, int oif, u8 protocol,
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__be16 sport, __be16 dport,
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struct sock *sk, bool can_sleep)
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{
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__u8 flow_flags = 0;
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if (inet_sk(sk)->transparent)
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flow_flags |= FLOWI_FLAG_ANYSRC;
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if (protocol == IPPROTO_TCP)
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flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
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if (can_sleep)
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flow_flags |= FLOWI_FLAG_CAN_SLEEP;
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flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
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protocol, flow_flags, dst, src, dport, sport);
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}
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static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
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__be32 dst, __be32 src, u32 tos,
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int oif, u8 protocol,
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__be16 sport, __be16 dport,
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struct sock *sk, bool can_sleep)
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{
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struct net *net = sock_net(sk);
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struct rtable *rt;
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ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
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sport, dport, sk, can_sleep);
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if (!dst || !src) {
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rt = __ip_route_output_key(net, fl4);
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if (IS_ERR(rt))
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return rt;
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ip_rt_put(rt);
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flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
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}
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security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
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return ip_route_output_flow(net, fl4, sk);
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}
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static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
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__be16 orig_sport, __be16 orig_dport,
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__be16 sport, __be16 dport,
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struct sock *sk)
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{
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if (sport != orig_sport || dport != orig_dport) {
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fl4->fl4_dport = dport;
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fl4->fl4_sport = sport;
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ip_rt_put(rt);
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flowi4_update_output(fl4, sk->sk_bound_dev_if,
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RT_CONN_FLAGS(sk), fl4->daddr,
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fl4->saddr);
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security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
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return ip_route_output_flow(sock_net(sk), fl4, sk);
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}
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return rt;
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}
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extern void rt_bind_peer(struct rtable *rt, __be32 daddr, int create);
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static inline struct inet_peer *rt_get_peer(struct rtable *rt, __be32 daddr)
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{
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if (rt->peer)
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return rt->peer;
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rt_bind_peer(rt, daddr, 0);
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return rt->peer;
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}
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static inline int inet_iif(const struct sk_buff *skb)
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{
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return skb_rtable(skb)->rt_iif;
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}
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extern int sysctl_ip_default_ttl;
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static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
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{
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int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
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if (hoplimit == 0)
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hoplimit = sysctl_ip_default_ttl;
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return hoplimit;
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}
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#endif /* _ROUTE_H */
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