217 lines
5.8 KiB
C
217 lines
5.8 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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#ifndef __KERNEL__
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#warning This file is not supposed to be used outside of kernel.
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#endif
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#define RTO_ONLINK 0x01
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#define RTO_CONN 0
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/* RTO_CONN is not used (being alias for 0), but preserved not to break
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* some modules referring to it. */
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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 rtable
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{
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union
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{
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struct dst_entry dst;
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} u;
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/* Cache lookup keys */
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struct flowi fl;
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struct in_device *idev;
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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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__be32 rt_dst; /* Path destination */
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__be32 rt_src; /* Path source */
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int rt_iif;
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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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struct inet_peer *peer; /* long-living peer info */
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};
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struct ip_rt_acct
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{
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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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{
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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 *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 int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
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extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
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extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
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extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
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extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, 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 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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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->u.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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static inline int ip_route_connect(struct rtable **rp, __be32 dst,
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__be32 src, u32 tos, int oif, u8 protocol,
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__be16 sport, __be16 dport, struct sock *sk,
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int flags)
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{
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struct flowi fl = { .oif = oif,
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.mark = sk->sk_mark,
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.nl_u = { .ip4_u = { .daddr = dst,
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.saddr = src,
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.tos = tos } },
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.proto = protocol,
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.uli_u = { .ports =
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{ .sport = sport,
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.dport = dport } } };
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int err;
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struct net *net = sock_net(sk);
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if (inet_sk(sk)->transparent)
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fl.flags |= FLOWI_FLAG_ANYSRC;
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if (!dst || !src) {
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err = __ip_route_output_key(net, rp, &fl);
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if (err)
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return err;
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fl.fl4_dst = (*rp)->rt_dst;
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fl.fl4_src = (*rp)->rt_src;
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ip_rt_put(*rp);
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*rp = NULL;
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}
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security_sk_classify_flow(sk, &fl);
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return ip_route_output_flow(net, rp, &fl, sk, flags);
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}
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static inline int ip_route_newports(struct rtable **rp, u8 protocol,
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__be16 sport, __be16 dport, struct sock *sk)
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{
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if (sport != (*rp)->fl.fl_ip_sport ||
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dport != (*rp)->fl.fl_ip_dport) {
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struct flowi fl;
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memcpy(&fl, &(*rp)->fl, sizeof(fl));
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fl.fl_ip_sport = sport;
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fl.fl_ip_dport = dport;
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fl.proto = protocol;
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ip_rt_put(*rp);
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*rp = NULL;
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security_sk_classify_flow(sk, &fl);
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return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
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}
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return 0;
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}
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extern void rt_bind_peer(struct rtable *rt, int create);
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static inline struct inet_peer *rt_get_peer(struct rtable *rt)
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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, 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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#endif /* _ROUTE_H */
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