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  *              This file implements the various access functions for the
  7  *              PROC file system.  It is mainly used for debugging and
  8  *              statistics.
  9  *
 10  * Version:     @(#)proc.c      1.0.5   05/27/93
 11  *
 12  * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 13  *              Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
 14  *              Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
 15  *
 16  * Fixes:
 17  *              Alan Cox        :       UDP sockets show the rxqueue/txqueue
 18  *                                      using hint flag for the netinfo.
 19  *      Pauline Middelink       :       Pidentd support
 20  *              Alan Cox        :       Make /proc safer.
 21  *
 22  * To Do:
 23  *              Put the creating userid in the proc/net/... files. This will
 24  *              allow us to write an RFC931 daemon for Linux
 25  *
 26  *              This program is free software; you can redistribute it and/or
 27  *              modify it under the terms of the GNU General Public License
 28  *              as published by the Free Software Foundation; either version
 29  *              2 of the License, or (at your option) any later version.
 30  */
 31 #include <asm/system.h>
 32 #include <linux/autoconf.h>
 33 #include <linux/sched.h>
 34 #include <linux/socket.h>
 35 #include <linux/net.h>
 36 #include <linux/un.h>
 37 #include <linux/in.h>
 38 #include <linux/param.h>
 39 #include "inet.h"
 40 #include "dev.h"
 41 #include "ip.h"
 42 #include "protocol.h"
 43 #include "tcp.h"
 44 #include "udp.h"
 45 #include "skbuff.h"
 46 #include "sock.h"
 47 #include "raw.h"
 48 
 49 /*
 50  * Get__netinfo returns the length of that string.
 51  *
 52  * KNOWN BUGS
 53  *  As in get_unix_netinfo, the buffer might be too small. If this
 54  *  happens, get__netinfo returns only part of the available infos.
 55  */
 56 static int
 57 get__netinfo(struct proto *pro, char *buffer, int format)
 58 {
 59   struct sock **s_array;
 60   struct sock *sp;
 61   char *pos=buffer;
 62   int i;
 63   int timer_active;
 64   unsigned long  dest, src;
 65   unsigned short destp, srcp;
 66 
 67   s_array = pro->sock_array;
 68   pos+=sprintf(pos, "sl  local_address rem_address   st tx_queue rx_queue tr tm->when uid\n");
 69 /*
 70  *      This was very pretty but didn't work when a socket is destroyed at the wrong moment
 71  *      (eg a syn recv socket getting a reset), or a memory timer destroy. Instead of playing
 72  *      with timers we just concede defeat and cli().
 73  */
 74   for(i = 0; i < SOCK_ARRAY_SIZE; i++) {
 75         cli();
 76         sp = s_array[i];
 77         while(sp != NULL) {
 78                 dest  = sp->daddr;
 79                 src   = sp->saddr;
 80                 destp = sp->dummy_th.dest;
 81                 srcp  = sp->dummy_th.source;
 82 
 83                 /* Since we are Little Endian we need to swap the bytes :-( */
 84                 destp = ntohs(destp);
 85                 srcp  = ntohs(srcp);
 86                 timer_active = del_timer(&sp->timer);
 87                 if (!timer_active)
 88                         sp->timer.expires = 0;
 89                 pos+=sprintf(pos, "%2d: %08lX:%04X %08lX:%04X %02X %08lX:%08lX %02X:%08lX %08X %d\n",
 90                         i, src, srcp, dest, destp, sp->state, 
 91                         format==0?sp->write_seq-sp->rcv_ack_seq:sp->rmem_alloc, 
 92                         format==0?sp->acked_seq-sp->copied_seq:sp->wmem_alloc,
 93                         timer_active, sp->timer.expires, (unsigned) sp->retransmits,
 94                         SOCK_INODE(sp->socket)->i_uid);
 95                 if (timer_active)
 96                         add_timer(&sp->timer);
 97                 /* Is place in buffer too rare? then abort. */
 98                 if (pos > buffer+PAGE_SIZE-80) {
 99                         printk("oops, too many %s sockets for netinfo.\n",
100                                         pro->name);
101                         return(strlen(buffer));
102                 }
103 
104                 /*
105                  * All sockets with (port mod SOCK_ARRAY_SIZE) = i
106                  * are kept in sock_array[i], so we must follow the
107                  * 'next' link to get them all.
108                  */
109                 sp = sp->next;
110         }
111         sti();  /* We only turn interrupts back on for a moment, but because the interrupt queues anything built up
112                    before this will clear before we jump back and cli, so its not as bad as it looks */
113   }
114   return(strlen(buffer));
115 } 
116 
117 
118 int tcp_get_info(char *buffer)
119 {
120   return get__netinfo(&tcp_prot, buffer,0);
121 }
122 
123 
124 int udp_get_info(char *buffer)
125 {
126   return get__netinfo(&udp_prot, buffer,1);
127 }
128 
129 
130 int raw_get_info(char *buffer)
131 {
132   return get__netinfo(&raw_prot, buffer,1);
133 }
134