include/net/ip.h

/* */
   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 module.
   7  *
   8  * Version:     @(#)ip.h        1.0.2   05/07/93
   9  *
  10  * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
  13  *
  14  *              This program is free software; you can redistribute it and/or
  15  *              modify it under the terms of the GNU General Public License
  16  *              as published by the Free Software Foundation; either version
  17  *              2 of the License, or (at your option) any later version.
  18  */
  19 #ifndef _IP_H
  20 #define _IP_H
  21 
  22 
  23 #include <linux/config.h>
  24 #include <linux/types.h>
  25 #include <linux/socket.h>
  26 #include <linux/ip.h>
  27 #include <linux/netdevice.h>
  28 
  29 #ifndef _SNMP_H
  30 #include <net/snmp.h>
  31 #endif
  32 
  33 #include <net/sock.h>   /* struct sock */
  34 
  35 /* IP flags. */
  36 #define IP_CE           0x8000          /* Flag: "Congestion"           */
  37 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
  38 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
  39 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
  40 
  41 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
  42 
  43 #ifdef CONFIG_IP_MULTICAST
  44 extern void             ip_mc_dropsocket(struct sock *);
  45 extern void             ip_mc_dropdevice(struct device *dev);
  46 extern int              ip_mc_procinfo(char *, char **, off_t, int, int);
  47 #endif
  48  
  49 
  50 /* Describe an IP fragment. */
  51 struct ipfrag 
  52 {
  53         int             offset;         /* offset of fragment in IP datagram    */
  54         int             end;            /* last byte of data in datagram        */
  55         int             len;            /* length of this fragment              */
  56         struct sk_buff  *skb;           /* complete received fragment           */
  57         unsigned char   *ptr;           /* pointer into real fragment data      */
  58         struct ipfrag   *next;          /* linked list pointers                 */
  59         struct ipfrag   *prev;
  60 };
  61 
  62 /*
  63  *      Describe an entry in the "incomplete datagrams" queue. 
  64  */
  65  
  66 struct ipq       
  67 {
  68         unsigned char   *mac;           /* pointer to MAC header                */
  69         struct iphdr    *iph;           /* pointer to IP header                 */
  70         int             len;            /* total length of original datagram    */
  71         short           ihlen;          /* length of the IP header              */      
  72         short           maclen;         /* length of the MAC header             */
  73         struct timer_list timer;        /* when will this queue expire?         */
  74         struct ipfrag   *fragments;     /* linked list of received fragments    */
  75         struct ipq      *next;          /* linked list pointers                 */
  76         struct ipq      *prev;
  77         struct device   *dev;           /* Device - for icmp replies */
  78 };
  79 
  80 /*
  81  *      Functions provided by ip.c
  82  */
  83 
  84 extern void             ip_print(const struct iphdr *ip);
  85 extern int              ip_ioctl(struct sock *sk, int cmd, unsigned long arg);
  86 extern void             ip_route_check(__u32 daddr); 
  87 extern int              ip_send(struct sk_buff *skb, __u32 daddr, int len, struct device *dev, __u32 saddr);
  88 extern int              ip_build_header(struct sk_buff *skb,
  89                                         __u32 saddr,
  90                                         __u32 daddr,
  91                                         struct device **dev, int type,
  92                                         struct options *opt, int len,
  93                                         int tos,int ttl);
  94 extern int              ip_rcv(struct sk_buff *skb, struct device *dev,
  95                                struct packet_type *pt);
  96 extern int              ip_options_echo(struct options * dopt, struct options * sopt,
  97                                         __u32 daddr, __u32 saddr,
  98                                         struct sk_buff * skb);
  99 extern int              ip_options_compile(struct options * opt, struct sk_buff * skb);
 100 extern void             ip_send_check(struct iphdr *ip);
 101 extern int              ip_id_count;                      
 102 extern void             ip_queue_xmit(struct sock *sk,
 103                                       struct device *dev, struct sk_buff *skb,
 104                                       int free);
 105 extern void             ip_init(void);
 106 extern int              ip_build_xmit(struct sock *sk,
 107                                       void getfrag (const void *,
 108                                                     __u32,
 109                                                     char *,
 110                                                     unsigned int,
 111                                                     unsigned int),
 112                                       const void *frag,
 113                                       unsigned short int length,
 114                                       __u32 daddr,
 115                                       __u32 saddr,
 116                                       struct options * opt,
 117                                       int flags,
 118                                       int type,
 119                                       int noblock);
 120 
 121 extern struct ip_mib    ip_statistics;
 122 
 123 /*
 124  *      Functions provided by ip_fragment.o
 125  */
 126  
 127 struct sk_buff *ip_defrag(struct iphdr *iph, struct sk_buff *skb, struct device *dev);
 128 void ip_fragment(struct sock *sk, struct sk_buff *skb, struct device *dev, int is_frag);
 129 
 130 /*
 131  *      Functions provided by ip_forward.c
 132  */
 133  
 134 extern int ip_forward(struct sk_buff *skb, struct device *dev, int is_frag, __u32 target_addr);
 135  
 136 /*
 137  *      Functions provided by ip_options.c
 138  */
 139  
 140 extern void ip_options_build(struct sk_buff *skb, struct options *opt, __u32 daddr, __u32 saddr, int is_frag);
 141 extern int ip_options_echo(struct options *dopt, struct options *sopt, __u32 daddr, __u32 saddr, struct sk_buff *skb);
 142 extern void ip_options_fragment(struct sk_buff *skb);
 143 extern int ip_options_compile(struct options *opt, struct sk_buff *skb);
 144 
 145 /*
 146  *      Functions provided by ip_sockglue.c
 147  */
 148 
 149 extern int              ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen);
 150 extern int              ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen);
 151   
 152 #endif  /* _IP_H */
/* */
root/include/net/ip.h

INCLUDED FROM
