LCOV - code coverage report
Current view: top level - include/net - route.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : /*
       2             :  * INET         An implementation of the TCP/IP protocol suite for the LINUX
       3             :  *              operating system.  INET  is implemented using the  BSD Socket
       4             :  *              interface as the means of communication with the user level.
       5             :  *
       6             :  *              Definitions for the IP router.
       7             :  *
       8             :  * Version:     @(#)route.h     1.0.4   05/27/93
       9             :  *
      10             :  * Authors:     Ross Biro
      11             :  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
      12             :  * Fixes:
      13             :  *              Alan Cox        :       Reformatted. Added ip_rt_local()
      14             :  *              Alan Cox        :       Support for TCP parameters.
      15             :  *              Alexey Kuznetsov:       Major changes for new routing code.
      16             :  *              Mike McLagan    :       Routing by source
      17             :  *              Robert Olsson   :       Added rt_cache statistics
      18             :  *
      19             :  *              This program is free software; you can redistribute it and/or
      20             :  *              modify it under the terms of the GNU General Public License
      21             :  *              as published by the Free Software Foundation; either version
      22             :  *              2 of the License, or (at your option) any later version.
      23             :  */
      24             : #ifndef _ROUTE_H
      25             : #define _ROUTE_H
      26             : 
      27             : #include <net/dst.h>
      28             : #include <net/inetpeer.h>
      29             : #include <net/flow.h>
      30             : #include <net/inet_sock.h>
      31             : #include <linux/in_route.h>
      32             : #include <linux/rtnetlink.h>
      33             : #include <linux/route.h>
      34             : #include <linux/ip.h>
      35             : #include <linux/cache.h>
      36             : #include <linux/security.h>
      37             : 
      38             : #ifndef __KERNEL__
      39             : #warning This file is not supposed to be used outside of kernel.
      40             : #endif
      41             : 
      42             : #define RTO_ONLINK      0x01
      43             : 
      44             : #define RTO_CONN        0
      45             : /* RTO_CONN is not used (being alias for 0), but preserved not to break
      46             :  * some modules referring to it. */
      47             : 
      48             : #define RT_CONN_FLAGS(sk)   (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
      49             : 
      50             : struct fib_nh;
      51             : struct inet_peer;
      52             : struct rtable {
      53             :         union {
      54             :                 struct dst_entry        dst;
      55             :         } u;
      56             : 
      57             :         /* Cache lookup keys */
      58             :         struct flowi            fl;
      59             : 
      60             :         struct in_device        *idev;
      61             :         
      62             :         int                     rt_genid;
      63             :         unsigned                rt_flags;
      64             :         __u16                   rt_type;
      65             : 
      66             :         __be32                  rt_dst; /* Path destination     */
      67             :         __be32                  rt_src; /* Path source          */
      68             :         int                     rt_iif;
      69             : 
      70             :         /* Info on neighbour */
      71             :         __be32                  rt_gateway;
      72             : 
      73             :         /* Miscellaneous cached information */
      74             :         __be32                  rt_spec_dst; /* RFC1122 specific destination */
      75             :         struct inet_peer        *peer; /* long-living peer info */
      76             : };
      77             : 
      78             : struct ip_rt_acct {
      79             :         __u32   o_bytes;
      80             :         __u32   o_packets;
      81             :         __u32   i_bytes;
      82             :         __u32   i_packets;
      83             : };
      84             : 
      85             : struct rt_cache_stat {
      86             :         unsigned int in_hit;
      87             :         unsigned int in_slow_tot;
      88             :         unsigned int in_slow_mc;
      89             :         unsigned int in_no_route;
      90             :         unsigned int in_brd;
      91             :         unsigned int in_martian_dst;
      92             :         unsigned int in_martian_src;
      93             :         unsigned int out_hit;
      94             :         unsigned int out_slow_tot;
      95             :         unsigned int out_slow_mc;
      96             :         unsigned int gc_total;
      97             :         unsigned int gc_ignored;
      98             :         unsigned int gc_goal_miss;
      99             :         unsigned int gc_dst_overflow;
     100             :         unsigned int in_hlist_search;
     101             :         unsigned int out_hlist_search;
     102             : };
     103             : 
     104             : extern struct ip_rt_acct *ip_rt_acct;
     105             : 
     106             : struct in_device;
     107             : extern int              ip_rt_init(void);
     108             : extern void             ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
     109             :                                        __be32 src, struct net_device *dev);
     110             : extern void             rt_cache_flush(struct net *net, int how);
     111             : extern void             rt_cache_flush_batch(void);
     112             : extern int              __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
     113             : extern int              ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
     114             : extern int              ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
     115             : extern int              ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
     116             : extern unsigned short   ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
     117             : extern void             ip_rt_send_redirect(struct sk_buff *skb);
     118             : 
     119             : extern unsigned         inet_addr_type(struct net *net, __be32 addr);
     120             : extern unsigned         inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
     121             : extern void             ip_rt_multicast_event(struct in_device *);
     122             : extern int              ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
     123             : extern void             ip_rt_get_source(u8 *src, struct rtable *rt);
     124             : extern int              ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb);
     125             : 
     126             : struct in_ifaddr;
     127             : extern void fib_add_ifaddr(struct in_ifaddr *);
     128             : 
     129             : static inline void ip_rt_put(struct rtable * rt)
     130             : {
     131             :         if (rt)
     132             :                 dst_release(&rt->u.dst);
     133             : }
     134             : 
     135             : #define IPTOS_RT_MASK   (IPTOS_TOS_MASK & ~3)
     136             : 
     137             : extern const __u8 ip_tos2prio[16];
     138             : 
     139             : static inline char rt_tos2priority(u8 tos)
     140             : {
     141             :         return ip_tos2prio[IPTOS_TOS(tos)>>1];
     142             : }
     143             : 
     144             : static inline int ip_route_connect(struct rtable **rp, __be32 dst,
     145             :                                    __be32 src, u32 tos, int oif, u8 protocol,
     146             :                                    __be16 sport, __be16 dport, struct sock *sk,
     147             :                                    int flags)
     148             : {
     149             :         struct flowi fl = { .oif = oif,
     150             :                             .mark = sk->sk_mark,
     151             :                             .nl_u = { .ip4_u = { .daddr = dst,
     152             :                                                  .saddr = src,
     153             :                                                  .tos   = tos } },
     154             :                             .proto = protocol,
     155             :                             .uli_u = { .ports =
     156             :                                        { .sport = sport,
     157             :                                          .dport = dport } } };
     158             : 
     159             :         int err;
     160             :         struct net *net = sock_net(sk);
     161             : 
     162             :         if (inet_sk(sk)->transparent)
     163             :                 fl.flags |= FLOWI_FLAG_ANYSRC;
     164             : 
     165             :         if (!dst || !src) {
     166             :                 err = __ip_route_output_key(net, rp, &fl);
     167             :                 if (err)
     168             :                         return err;
     169             :                 fl.fl4_dst = (*rp)->rt_dst;
     170             :                 fl.fl4_src = (*rp)->rt_src;
     171             :                 ip_rt_put(*rp);
     172             :                 *rp = NULL;
     173             :         }
     174             :         security_sk_classify_flow(sk, &fl);
     175             :         return ip_route_output_flow(net, rp, &fl, sk, flags);
     176             : }
     177             : 
     178             : static inline int ip_route_newports(struct rtable **rp, u8 protocol,
     179             :                                     __be16 sport, __be16 dport, struct sock *sk)
     180             : {
     181             :         if (sport != (*rp)->fl.fl_ip_sport ||
     182             :             dport != (*rp)->fl.fl_ip_dport) {
     183             :                 struct flowi fl;
     184             : 
     185             :                 memcpy(&fl, &(*rp)->fl, sizeof(fl));
     186             :                 fl.fl_ip_sport = sport;
     187             :                 fl.fl_ip_dport = dport;
     188             :                 fl.proto = protocol;
     189             :                 ip_rt_put(*rp);
     190             :                 *rp = NULL;
     191             :                 security_sk_classify_flow(sk, &fl);
     192             :                 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
     193             :         }
     194             :         return 0;
     195             : }
     196             : 
     197             : extern void rt_bind_peer(struct rtable *rt, int create);
     198             : 
     199             : static inline struct inet_peer *rt_get_peer(struct rtable *rt)
     200             : {
     201             :         if (rt->peer)
     202             :                 return rt->peer;
     203             : 
     204             :         rt_bind_peer(rt, 0);
     205             :         return rt->peer;
     206             : }
     207             : 
     208             : static inline int inet_iif(const struct sk_buff *skb)
     209             : {
     210             :         return skb_rtable(skb)->rt_iif;
     211             : }
     212           1 : 
     213             : #endif  /* _ROUTE_H */

Generated by: LCOV version 1.10