| /* |
| * 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> |
| |
| #define RTO_ONLINK 0x01 |
| |
| #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) |
| |
| struct fib_nh; |
| struct fib_info; |
| struct rtable { |
| struct dst_entry dst; |
| |
| int rt_genid; |
| unsigned int rt_flags; |
| __u16 rt_type; |
| |
| __be32 rt_dst; /* Path destination */ |
| int rt_route_iif; |
| int rt_iif; |
| int rt_oif; |
| __u32 rt_mark; |
| |
| /* Info on neighbour */ |
| __be32 rt_gateway; |
| |
| /* Miscellaneous cached information */ |
| u32 rt_pmtu; |
| struct fib_info *fi; /* for client ref to shared metrics */ |
| }; |
| |
| static inline bool rt_is_input_route(const struct rtable *rt) |
| { |
| return rt->rt_route_iif != 0; |
| } |
| |
| static inline bool rt_is_output_route(const struct rtable *rt) |
| { |
| return rt->rt_route_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 rt_cache_flush(struct net *net, int how); |
| extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp); |
| extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *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 flowi4 *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 flowi4 fl4 = { |
| .flowi4_oif = oif, |
| .flowi4_tos = tos, |
| .daddr = daddr, |
| .saddr = saddr, |
| }; |
| return ip_route_output_key(net, &fl4); |
| } |
| |
| static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4, |
| struct sock *sk, |
| __be32 daddr, __be32 saddr, |
| __be16 dport, __be16 sport, |
| __u8 proto, __u8 tos, int oif) |
| { |
| flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos, |
| RT_SCOPE_UNIVERSE, proto, |
| sk ? inet_sk_flowi_flags(sk) : 0, |
| daddr, saddr, dport, sport); |
| if (sk) |
| security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
| return ip_route_output_flow(net, fl4, sk); |
| } |
| |
| static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4, |
| __be32 daddr, __be32 saddr, |
| __be32 gre_key, __u8 tos, int oif) |
| { |
| memset(fl4, 0, sizeof(*fl4)); |
| fl4->flowi4_oif = oif; |
| fl4->daddr = daddr; |
| fl4->saddr = saddr; |
| fl4->flowi4_tos = tos; |
| fl4->flowi4_proto = IPPROTO_GRE; |
| fl4->fl4_gre_key = gre_key; |
| return ip_route_output_key(net, fl4); |
| } |
| |
| extern int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, |
| u8 tos, struct net_device *devin); |
| |
| extern void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
| int oif, u32 mark, u8 protocol, int flow_flags); |
| extern void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu); |
| extern void ipv4_redirect(struct sk_buff *skb, struct net *net, |
| int oif, u32 mark, u8 protocol, int flow_flags); |
| extern void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk); |
| extern void ip_rt_send_redirect(struct sk_buff *skb); |
| |
| extern unsigned int inet_addr_type(struct net *net, __be32 addr); |
| extern unsigned int 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 sk_buff *skb, 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 *); |
| extern void fib_del_ifaddr(struct in_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]; |
| } |
| |
| /* ip_route_connect() and ip_route_newports() work in tandem whilst |
| * binding a socket for a new outgoing connection. |
| * |
| * In order to use IPSEC properly, we must, in the end, have a |
| * route that was looked up using all available keys including source |
| * and destination ports. |
| * |
| * However, if a source port needs to be allocated (the user specified |
| * a wildcard source port) we need to obtain addressing information |
| * in order to perform that allocation. |
| * |
| * So ip_route_connect() looks up a route using wildcarded source and |
| * destination ports in the key, simply so that we can get a pair of |
| * addresses to use for port allocation. |
| * |
| * Later, once the ports are allocated, ip_route_newports() will make |
| * another route lookup if needed to make sure we catch any IPSEC |
| * rules keyed on the port information. |
| * |
| * The callers allocate the flow key on their stack, and must pass in |
| * the same flowi4 object to both the ip_route_connect() and the |
| * ip_route_newports() calls. |
| */ |
| |
| static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, |
| u32 tos, int oif, u8 protocol, |
| __be16 sport, __be16 dport, |
| struct sock *sk, bool can_sleep) |
| { |
| __u8 flow_flags = 0; |
| |
| if (inet_sk(sk)->transparent) |
| flow_flags |= FLOWI_FLAG_ANYSRC; |
| if (can_sleep) |
| flow_flags |= FLOWI_FLAG_CAN_SLEEP; |
| |
| flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE, |
| protocol, flow_flags, dst, src, dport, sport); |
| } |
| |
| static inline struct rtable *ip_route_connect(struct flowi4 *fl4, |
| __be32 dst, __be32 src, u32 tos, |
| int oif, u8 protocol, |
| __be16 sport, __be16 dport, |
| struct sock *sk, bool can_sleep) |
| { |
| struct net *net = sock_net(sk); |
| struct rtable *rt; |
| |
| ip_route_connect_init(fl4, dst, src, tos, oif, protocol, |
| sport, dport, sk, can_sleep); |
| |
| if (!dst || !src) { |
| rt = __ip_route_output_key(net, fl4); |
| if (IS_ERR(rt)) |
| return rt; |
| ip_rt_put(rt); |
| flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr); |
| } |
| security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
| return ip_route_output_flow(net, fl4, sk); |
| } |
| |
| static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, |
| __be16 orig_sport, __be16 orig_dport, |
| __be16 sport, __be16 dport, |
| struct sock *sk) |
| { |
| if (sport != orig_sport || dport != orig_dport) { |
| fl4->fl4_dport = dport; |
| fl4->fl4_sport = sport; |
| ip_rt_put(rt); |
| flowi4_update_output(fl4, sk->sk_bound_dev_if, |
| RT_CONN_FLAGS(sk), fl4->daddr, |
| fl4->saddr); |
| security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
| return ip_route_output_flow(sock_net(sk), fl4, sk); |
| } |
| return rt; |
| } |
| |
| 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 */ |