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Diffstat (limited to 'include/net/route.h')
| -rw-r--r-- | include/net/route.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/include/net/route.h b/include/net/route.h new file mode 100644 index 00000000000..bce6dd68d27 --- /dev/null +++ b/include/net/route.h @@ -0,0 +1,213 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Definitions for the IP router. + * + * Version: @(#)route.h 1.0.4 05/27/93 + * + * Authors: Ross Biro + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Fixes: + * Alan Cox : Reformatted. Added ip_rt_local() + * Alan Cox : Support for TCP parameters. + * Alexey Kuznetsov: Major changes for new routing code. + * Mike McLagan : Routing by source + * Robert Olsson : Added rt_cache statistics + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _ROUTE_H +#define _ROUTE_H + +#include <net/dst.h> +#include <net/inetpeer.h> +#include <net/flow.h> +#include <net/inet_sock.h> +#include <linux/in_route.h> +#include <linux/rtnetlink.h> +#include <linux/route.h> +#include <linux/ip.h> +#include <linux/cache.h> +#include <linux/security.h> + +#ifndef __KERNEL__ +#warning This file is not supposed to be used outside of kernel. +#endif + +#define RTO_ONLINK 0x01 + +#define RTO_CONN 0 +/* RTO_CONN is not used (being alias for 0), but preserved not to break + * some modules referring to it. */ + +#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) + +struct fib_nh; +struct inet_peer; +struct rtable { + union { + struct dst_entry dst; + } u; + + /* Cache lookup keys */ + struct flowi fl; + + struct in_device *idev; + + int rt_genid; + unsigned rt_flags; + __u16 rt_type; + + __be32 rt_dst; /* Path destination */ + __be32 rt_src; /* Path source */ + int rt_iif; + + /* Info on neighbour */ + __be32 rt_gateway; + + /* Miscellaneous cached information */ + __be32 rt_spec_dst; /* RFC1122 specific destination */ + struct inet_peer *peer; /* long-living peer info */ +}; + +struct ip_rt_acct { + __u32 o_bytes; + __u32 o_packets; + __u32 i_bytes; + __u32 i_packets; +}; + +struct rt_cache_stat { + unsigned int in_hit; + unsigned int in_slow_tot; + unsigned int in_slow_mc; + unsigned int in_no_route; + unsigned int in_brd; + unsigned int in_martian_dst; + unsigned int in_martian_src; + unsigned int out_hit; + unsigned int out_slow_tot; + unsigned int out_slow_mc; + unsigned int gc_total; + unsigned int gc_ignored; + unsigned int gc_goal_miss; + unsigned int gc_dst_overflow; + unsigned int in_hlist_search; + unsigned int out_hlist_search; +}; + +extern struct ip_rt_acct *ip_rt_acct; + +struct in_device; +extern int ip_rt_init(void); +extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, + __be32 src, struct net_device *dev); +extern void rt_cache_flush(struct net *net, int how); +extern void rt_cache_flush_batch(void); +extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); +extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); +extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); +extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin); +extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); +extern void ip_rt_send_redirect(struct sk_buff *skb); + +extern unsigned inet_addr_type(struct net *net, __be32 addr); +extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); +extern void ip_rt_multicast_event(struct in_device *); +extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); +extern void ip_rt_get_source(u8 *src, struct rtable *rt); +extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); + +struct in_ifaddr; +extern void fib_add_ifaddr(struct in_ifaddr *); + +static inline void ip_rt_put(struct rtable * rt) +{ + if (rt) + dst_release(&rt->u.dst); +} + +#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) + +extern const __u8 ip_tos2prio[16]; + +static inline char rt_tos2priority(u8 tos) +{ + return ip_tos2prio[IPTOS_TOS(tos)>>1]; +} + +static inline int ip_route_connect(struct rtable **rp, __be32 dst, + __be32 src, u32 tos, int oif, u8 protocol, + __be16 sport, __be16 dport, struct sock *sk, + int flags) +{ + struct flowi fl = { .oif = oif, + .mark = sk->sk_mark, + .nl_u = { .ip4_u = { .daddr = dst, + .saddr = src, + .tos = tos } }, + .proto = protocol, + .uli_u = { .ports = + { .sport = sport, + .dport = dport } } }; + + int err; + struct net *net = sock_net(sk); + + if (inet_sk(sk)->transparent) + fl.flags |= FLOWI_FLAG_ANYSRC; + + if (!dst || !src) { + err = __ip_route_output_key(net, rp, &fl); + if (err) + return err; + fl.fl4_dst = (*rp)->rt_dst; + fl.fl4_src = (*rp)->rt_src; + ip_rt_put(*rp); + *rp = NULL; + } + security_sk_classify_flow(sk, &fl); + return ip_route_output_flow(net, rp, &fl, sk, flags); +} + +static inline int ip_route_newports(struct rtable **rp, u8 protocol, + __be16 sport, __be16 dport, struct sock *sk) +{ + if (sport != (*rp)->fl.fl_ip_sport || + dport != (*rp)->fl.fl_ip_dport) { + struct flowi fl; + + memcpy(&fl, &(*rp)->fl, sizeof(fl)); + fl.fl_ip_sport = sport; + fl.fl_ip_dport = dport; + fl.proto = protocol; + ip_rt_put(*rp); + *rp = NULL; + security_sk_classify_flow(sk, &fl); + return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); + } + return 0; +} + +extern void rt_bind_peer(struct rtable *rt, int create); + +static inline struct inet_peer *rt_get_peer(struct rtable *rt) +{ + if (rt->peer) + return rt->peer; + + rt_bind_peer(rt, 0); + return rt->peer; +} + +static inline int inet_iif(const struct sk_buff *skb) +{ + return skb_rtable(skb)->rt_iif; +} + +#endif /* _ROUTE_H */ |