| /* |
| * 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 fib_info; |
| struct rtable { |
| struct dst_entry dst; |
| |
| /* Lookup key. */ |
| __be32 rt_key_dst; |
| __be32 rt_key_src; |
| |
| int rt_genid; |
| unsigned rt_flags; |
| __u16 rt_type; |
| __u8 rt_tos; |
| |
| __be32 rt_dst; /* Path destination */ |
| __be32 rt_src; /* Path source */ |
| int rt_iif; |
| int rt_oif; |
| __u32 rt_mark; |
| |
| /* Info on neighbour */ |
| __be32 rt_gateway; |
| |
| /* Miscellaneous cached information */ |
| __be32 rt_spec_dst; /* RFC1122 specific destination */ |
| u32 rt_peer_genid; |
| struct inet_peer *peer; /* long-living peer info */ |
| struct fib_info *fi; /* for client ref to shared metrics */ |
| }; |
| |
| static inline bool rt_is_input_route(struct rtable *rt) |
| { |
| return rt->rt_iif != 0; |
| } |
| |
| static inline bool rt_is_output_route(struct rtable *rt) |
| { |
| return rt->rt_iif == 0; |
| } |
| |
| 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 __percpu *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(struct net *net); |
| extern struct rtable *__ip_route_output_key(struct net *, const struct flowi *flp); |
| extern struct rtable *ip_route_output_flow(struct net *, struct flowi *flp, |
| struct sock *sk); |
| extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig); |
| |
| static inline struct rtable *ip_route_output_key(struct net *net, struct flowi *flp) |
| { |
| return ip_route_output_flow(net, flp, NULL); |
| } |
| |
| static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, |
| __be32 saddr, u8 tos, int oif) |
| { |
| struct flowi fl = { |
| .flowi_oif = oif, |
| .fl4_dst = daddr, |
| .fl4_src = saddr, |
| .fl4_tos = tos, |
| }; |
| return ip_route_output_key(net, &fl); |
| } |
| |
| static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk, |
| __be32 daddr, __be32 saddr, |
| __be16 dport, __be16 sport, |
| __u8 proto, __u8 tos, int oif) |
| { |
| struct flowi fl = { |
| .flowi_oif = oif, |
| .flowi_flags = sk ? inet_sk_flowi_flags(sk) : 0, |
| .flowi_mark = sk ? sk->sk_mark : 0, |
| .fl4_dst = daddr, |
| .fl4_src = saddr, |
| .fl4_tos = tos, |
| .flowi_proto = proto, |
| .fl_ip_dport = dport, |
| .fl_ip_sport = sport, |
| }; |
| if (sk) |
| security_sk_classify_flow(sk, &fl); |
| return ip_route_output_flow(net, &fl, sk); |
| } |
| |
| static inline struct rtable *ip_route_output_gre(struct net *net, |
| __be32 daddr, __be32 saddr, |
| __be32 gre_key, __u8 tos, int oif) |
| { |
| struct flowi fl = { |
| .flowi_oif = oif, |
| .fl4_dst = daddr, |
| .fl4_src = saddr, |
| .fl4_tos = tos, |
| .flowi_proto = IPPROTO_GRE, |
| .fl_gre_key = gre_key, |
| }; |
| return ip_route_output_key(net, &fl); |
| } |
| |
| extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, |
| u8 tos, struct net_device *devin, bool noref); |
| |
| static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, |
| u8 tos, struct net_device *devin) |
| { |
| return ip_route_input_common(skb, dst, src, tos, devin, false); |
| } |
| |
| static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, |
| u8 tos, struct net_device *devin) |
| { |
| return ip_route_input_common(skb, dst, src, tos, devin, true); |
| } |
| |
| 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->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 struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos, |
| int oif, u8 protocol, |
| __be16 sport, __be16 dport, |
| struct sock *sk, bool can_sleep) |
| { |
| struct flowi fl = { .flowi_oif = oif, |
| .flowi_mark = sk->sk_mark, |
| .fl4_dst = dst, |
| .fl4_src = src, |
| .fl4_tos = tos, |
| .flowi_proto = protocol, |
| .fl_ip_sport = sport, |
| .fl_ip_dport = dport }; |
| struct net *net = sock_net(sk); |
| struct rtable *rt; |
| |
| if (inet_sk(sk)->transparent) |
| fl.flowi_flags |= FLOWI_FLAG_ANYSRC; |
| if (protocol == IPPROTO_TCP) |
| fl.flowi_flags |= FLOWI_FLAG_PRECOW_METRICS; |
| if (can_sleep) |
| fl.flowi_flags |= FLOWI_FLAG_CAN_SLEEP; |
| |
| if (!dst || !src) { |
| rt = __ip_route_output_key(net, &fl); |
| if (IS_ERR(rt)) |
| return rt; |
| fl.fl4_dst = rt->rt_dst; |
| fl.fl4_src = rt->rt_src; |
| ip_rt_put(rt); |
| } |
| security_sk_classify_flow(sk, &fl); |
| return ip_route_output_flow(net, &fl, sk); |
| } |
| |
| static inline struct rtable *ip_route_newports(struct rtable *rt, |
| u8 protocol, __be16 orig_sport, |
| __be16 orig_dport, __be16 sport, |
| __be16 dport, struct sock *sk) |
| { |
| if (sport != orig_sport || dport != orig_dport) { |
| struct flowi fl = { .flowi_oif = rt->rt_oif, |
| .flowi_mark = rt->rt_mark, |
| .fl4_dst = rt->rt_key_dst, |
| .fl4_src = rt->rt_key_src, |
| .fl4_tos = rt->rt_tos, |
| .flowi_proto = protocol, |
| .fl_ip_sport = sport, |
| .fl_ip_dport = dport }; |
| |
| if (inet_sk(sk)->transparent) |
| fl.flowi_flags |= FLOWI_FLAG_ANYSRC; |
| if (protocol == IPPROTO_TCP) |
| fl.flowi_flags |= FLOWI_FLAG_PRECOW_METRICS; |
| ip_rt_put(rt); |
| security_sk_classify_flow(sk, &fl); |
| return ip_route_output_flow(sock_net(sk), &fl, sk); |
| } |
| return rt; |
| } |
| |
| 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; |
| } |
| |
| extern int sysctl_ip_default_ttl; |
| |
| static inline int ip4_dst_hoplimit(const struct dst_entry *dst) |
| { |
| int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
| |
| if (hoplimit == 0) |
| hoplimit = sysctl_ip_default_ttl; |
| return hoplimit; |
| } |
| |
| #endif /* _ROUTE_H */ |