ip.h

An implementation of the TCP/IP protocol suite for the LINUX operating system. INET is implemented u

  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, <[e-mail]>
 11  *              Fred N. van Kempen, <[e-mail]>
 12  *
 13  *              This program is free software; you can redistribute it and/or
 14  *              modify it under the terms of the GNU General Public License
 15  *              as published by the Free Software Foundation; either version
 16  *              2 of the License, or (at your option) any later version.
 17  */
 18 #ifndef _IP_H
 19 #define _IP_H
 20 
 21 
 22 #include <linux/ip.h>
 23 
 24 
 25 #include "sock.h"       /* struct sock */
 26 
 27 /* IP flags. */
 28 #define IP_CE           0x8000          /* Flag: "Congestion"           */
 29 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
 30 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
 31 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
 32 
 33 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
 34 
 35 
 36 /* Describe an IP fragment. */
 37 struct ipfrag {
 38   int           offset;         /* offset of fragment in IP datagram    */
 39   int           end;            /* last byte of data in datagram        */
 40   int           len;            /* length of this fragment              */
 41   struct sk_buff *skb;                  /* complete received fragment           */
 42   unsigned char         *ptr;           /* pointer into real fragment data      */
 43   struct ipfrag         *next;          /* linked list pointers                 */
 44   struct ipfrag         *prev;
 45 };
 46 
 47 /* Describe an entry in the "incomplete datagrams" queue. */
 48 struct ipq       {
 49   unsigned char         *mac;           /* pointer to MAC header                */
 50   struct iphdr  *iph;           /* pointer to IP header                 */
 51   int           len;            /* total length of original datagram    */
 52   short                 ihlen;          /* length of the IP header              */
 53   short         maclen;         /* length of the MAC header             */
 54   struct timer_list timer;      /* when will this queue expire?         */
 55   struct ipfrag         *fragments;     /* linked list of received fragments    */
 56   struct ipq    *next;          /* linked list pointers                 */
 57   struct ipq    *prev;
 58   struct device *dev;           /* Device - for icmp replies */
 59 };
 60 
 61 
 62 extern int              backoff(int n);
 63 
 64 extern void             ip_print(struct iphdr *ip);
 65 extern int              ip_ioctl(struct sock *sk, int cmd,
 66                                  unsigned long arg);
 67 extern void             ip_route_check(unsigned long daddr);
 68 extern int              ip_build_header(struct sk_buff *skb,
 69                                         unsigned long saddr,
 70                                         unsigned long daddr,
 71                                         struct device **dev, int type,
 72                                         struct options *opt, int len,
 73                                         int tos,int ttl);
 74 extern unsigned short   ip_compute_csum(unsigned char * buff, int len);
 75 extern int              ip_rcv(struct sk_buff *skb, struct device *dev,
 76                                struct packet_type *pt);
 77 extern void             ip_queue_xmit(struct sock *sk,
 78                                       struct device *dev, struct sk_buff *skb,
 79                                       int free);
 80 extern void             ip_retransmit(struct sock *sk, int all);
 81 extern void             ip_do_retransmit(struct sock *sk, int all);
 82 extern int              ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen);
 83 extern int              ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen);
 84 
 85 #endif  /* _IP_H */
 86