tests/free.c

   1 static int del_from_chain(struct ip_fw *volatile*chainptr, struct ip_fw *frwl)
   2 {
   3         struct ip_fw    *ftmp,*ltmp;
   4         unsigned short  tport1,tport2,tmpnum;
   5         char            matches,was_found;
   6         unsigned long   flags;
   7
   8         save_flags(flags);
   9         cli();
  10
  11         ftmp=*chainptr;
  12
  13         if ( ftmp == NULL )
  14         {
  15 #ifdef DEBUG_IP_FIREWALL
  16                 printk("ip_fw_ctl:  chain is empty\n");
  17 #endif
  18                 restore_flags(flags);
  19                 return( EINVAL );
  20         }
  21
  22         ltmp=NULL;
  23         was_found=0;
  24
  25         while( !was_found && ftmp != NULL )
  26         {
  27                 matches=1;
  28                 if (ftmp->fw_src.s_addr!=frwl->fw_src.s_addr
  29                      ||  ftmp->fw_dst.s_addr!=frwl->fw_dst.s_addr
  30                      ||  ftmp->fw_smsk.s_addr!=frwl->fw_smsk.s_addr
  31                      ||  ftmp->fw_dmsk.s_addr!=frwl->fw_dmsk.s_addr
  32                      ||  ftmp->fw_via.s_addr!=frwl->fw_via.s_addr
  33                      ||  ftmp->fw_flg!=frwl->fw_flg)
  34                         matches=0;
  35
  36                 tport1=ftmp->fw_nsp+ftmp->fw_ndp;
  37                 tport2=frwl->fw_nsp+frwl->fw_ndp;
  38                 if (tport1!=tport2)
  39                         matches=0;
  40                 else if (tport1!=0)
  41                 {
  42                         for (tmpnum=0;tmpnum < tport1 && tmpnum < IP_FW_MAX_PORTS;tmpnum++)
  43                         if (ftmp->fw_pts[tmpnum]!=frwl->fw_pts[tmpnum])
  44                                 matches=0;
  45                 }
  46                 if (strncmp(ftmp->fw_vianame, frwl->fw_vianame, IFNAMSIZ))
  47                         matches=0;
  48                 if(matches)
  49                 {
  50                         was_found=1;
  51                         if (ltmp)
  52                         {
  53                                 ltmp->fw_next=ftmp->fw_next;
  54                                 kfree(ftmp);
  55                                 ftmp=ltmp->fw_next;
  56                         }
  57                         else
  58                         {
  59                                 *chainptr=ftmp->fw_next;
  60                                 kfree(ftmp);
  61                                 ftmp=*chainptr;
  62                         }
  63                 }
  64                 else
  65                 {
  66                         ltmp = ftmp;
  67                         ftmp = ftmp->fw_next;
  68                  }
  69         }
  70         restore_flags(flags);
  71         if (was_found)
  72                 return 0;
  73         else
  74                 return(EINVAL);
  75 }