net/irda/irlan/irlan_filter.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irlan_filter.c
   4  * Version:
   5  * Description:
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Fri Jan 29 11:16:38 1999
   9  * Modified at:   Sat Oct 30 12:58:45 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
  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 as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  20  *     provide warranty for any of this software. This material is
  21  *     provided "AS-IS" and at no charge.
  22  *
  23  ********************************************************************/
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/random.h>
  27 #include <linux/seq_file.h>
  28
  29 #include <net/irda/irlan_common.h>
  30
  31 /*
  32  * Function irlan_filter_request (self, skb)
  33  *
  34  *    Handle filter request from client peer device
  35  *
  36  */
  37 void irlan_filter_request(struct irlan_cb *self, struct sk_buff *skb)
  38 {
  39         IRDA_ASSERT(self != NULL, return;);
  40         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
  41
  42         if ((self->provider.filter_type == IRLAN_DIRECTED) &&
  43             (self->provider.filter_operation == DYNAMIC))
  44         {
  45                 IRDA_DEBUG(0, "Giving peer a dynamic Ethernet address\n");
  46                 self->provider.mac_address[0] = 0x40;
  47                 self->provider.mac_address[1] = 0x00;
  48                 self->provider.mac_address[2] = 0x00;
  49                 self->provider.mac_address[3] = 0x00;
  50
  51                 /* Use arbitration value to generate MAC address */
  52                 if (self->provider.access_type == ACCESS_PEER) {
  53                         self->provider.mac_address[4] =
  54                                 self->provider.send_arb_val & 0xff;
  55                         self->provider.mac_address[5] =
  56                                 (self->provider.send_arb_val >> 8) & 0xff;
  57                 } else {
  58                         /* Just generate something for now */
  59                         get_random_bytes(self->provider.mac_address+4, 1);
  60                         get_random_bytes(self->provider.mac_address+5, 1);
  61                 }
  62
  63                 skb->data[0] = 0x00; /* Success */
  64                 skb->data[1] = 0x03;
  65                 irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
  66                 irlan_insert_short_param(skb, "MAX_ENTRY", 0x0001);
  67                 irlan_insert_array_param(skb, "FILTER_ENTRY",
  68                                          self->provider.mac_address, 6);
  69                 return;
  70         }
  71
  72         if ((self->provider.filter_type == IRLAN_DIRECTED) &&
  73             (self->provider.filter_mode == FILTER))
  74         {
  75                 IRDA_DEBUG(0, "Directed filter on\n");
  76                 skb->data[0] = 0x00; /* Success */
  77                 skb->data[1] = 0x00;
  78                 return;
  79         }
  80         if ((self->provider.filter_type == IRLAN_DIRECTED) &&
  81             (self->provider.filter_mode == NONE))
  82         {
  83                 IRDA_DEBUG(0, "Directed filter off\n");
  84                 skb->data[0] = 0x00; /* Success */
  85                 skb->data[1] = 0x00;
  86                 return;
  87         }
  88
  89         if ((self->provider.filter_type == IRLAN_BROADCAST) &&
  90             (self->provider.filter_mode == FILTER))
  91         {
  92                 IRDA_DEBUG(0, "Broadcast filter on\n");
  93                 skb->data[0] = 0x00; /* Success */
  94                 skb->data[1] = 0x00;
  95                 return;
  96         }
  97         if ((self->provider.filter_type == IRLAN_BROADCAST) &&
  98             (self->provider.filter_mode == NONE))
  99         {
 100                 IRDA_DEBUG(0, "Broadcast filter off\n");
 101                 skb->data[0] = 0x00; /* Success */
 102                 skb->data[1] = 0x00;
 103                 return;
 104         }
 105         if ((self->provider.filter_type == IRLAN_MULTICAST) &&
 106             (self->provider.filter_mode == FILTER))
 107         {
 108                 IRDA_DEBUG(0, "Multicast filter on\n");
 109                 skb->data[0] = 0x00; /* Success */
 110                 skb->data[1] = 0x00;
 111                 return;
 112         }
 113         if ((self->provider.filter_type == IRLAN_MULTICAST) &&
 114             (self->provider.filter_mode == NONE))
 115         {
 116                 IRDA_DEBUG(0, "Multicast filter off\n");
 117                 skb->data[0] = 0x00; /* Success */
 118                 skb->data[1] = 0x00;
 119                 return;
 120         }
 121         if ((self->provider.filter_type == IRLAN_MULTICAST) &&
 122             (self->provider.filter_operation == GET))
 123         {
 124                 IRDA_DEBUG(0, "Multicast filter get\n");
 125                 skb->data[0] = 0x00; /* Success? */
 126                 skb->data[1] = 0x02;
 127                 irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
 128                 irlan_insert_short_param(skb, "MAX_ENTRY", 16);
 129                 return;
 130         }
 131         skb->data[0] = 0x00; /* Command not supported */
 132         skb->data[1] = 0x00;
 133
 134         IRDA_DEBUG(0, "Not implemented!\n");
 135 }
 136
 137 /*
 138  * Function check_request_param (self, param, value)
 139  *
 140  *    Check parameters in request from peer device
 141  *
 142  */
 143 void irlan_check_command_param(struct irlan_cb *self, char *param, char *value)
 144 {
 145         __u8 *bytes;
 146
 147         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 148
 149         bytes = value;
 150
 151         IRDA_ASSERT(self != NULL, return;);
 152         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 153
 154         IRDA_DEBUG(4, "%s, %s\n", param, value);
 155
 156         /*
 157          *  This is experimental!! DB.
 158          */
 159          if (strcmp(param, "MODE") == 0) {
 160                 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 161                 self->use_udata = TRUE;
 162                 return;
 163         }
 164
 165         /*
 166          *  FILTER_TYPE
 167          */
 168         if (strcmp(param, "FILTER_TYPE") == 0) {
 169                 if (strcmp(value, "DIRECTED") == 0) {
 170                         self->provider.filter_type = IRLAN_DIRECTED;
 171                         return;
 172                 }
 173                 if (strcmp(value, "MULTICAST") == 0) {
 174                         self->provider.filter_type = IRLAN_MULTICAST;
 175                         return;
 176                 }
 177                 if (strcmp(value, "BROADCAST") == 0) {
 178                         self->provider.filter_type = IRLAN_BROADCAST;
 179                         return;
 180                 }
 181         }
 182         /*
 183          *  FILTER_MODE
 184          */
 185         if (strcmp(param, "FILTER_MODE") == 0) {
 186                 if (strcmp(value, "ALL") == 0) {
 187                         self->provider.filter_mode = ALL;
 188                         return;
 189                 }
 190                 if (strcmp(value, "FILTER") == 0) {
 191                         self->provider.filter_mode = FILTER;
 192                         return;
 193                 }
 194                 if (strcmp(value, "NONE") == 0) {
 195                         self->provider.filter_mode = FILTER;
 196                         return;
 197                 }
 198         }
 199         /*
 200          *  FILTER_OPERATION
 201          */
 202         if (strcmp(param, "FILTER_OPERATION") == 0) {
 203                 if (strcmp(value, "DYNAMIC") == 0) {
 204                         self->provider.filter_operation = DYNAMIC;
 205                         return;
 206                 }
 207                 if (strcmp(value, "GET") == 0) {
 208                         self->provider.filter_operation = GET;
 209                         return;
 210                 }
 211         }
 212 }
 213
 214 /*
 215  * Function irlan_print_filter (filter_type, buf)
 216  *
 217  *    Print status of filter. Used by /proc file system
 218  *
 219  */
 220 #ifdef CONFIG_PROC_FS
 221 #define MASK2STR(m,s)   { .mask = m, .str = s }
 222
 223 void irlan_print_filter(struct seq_file *seq, int filter_type)
 224 {
 225         static struct {
 226                 int mask;
 227                 const char *str;
 228         } filter_mask2str[] = {
 229                 MASK2STR(IRLAN_DIRECTED,        "DIRECTED"),
 230                 MASK2STR(IRLAN_FUNCTIONAL,      "FUNCTIONAL"),
 231                 MASK2STR(IRLAN_GROUP,           "GROUP"),
 232                 MASK2STR(IRLAN_MAC_FRAME,       "MAC_FRAME"),
 233                 MASK2STR(IRLAN_MULTICAST,       "MULTICAST"),
 234                 MASK2STR(IRLAN_BROADCAST,       "BROADCAST"),
 235                 MASK2STR(IRLAN_IPX_SOCKET,      "IPX_SOCKET"),
 236                 MASK2STR(0,                     NULL)
 237         }, *p;
 238
 239         for (p = filter_mask2str; p->str; p++) {
 240                 if (filter_type & p->mask)
 241                         seq_printf(seq, "%s ", p->str);
 242         }
 243         seq_putc(seq, '\n');
 244 }
 245 #undef MASK2STR
 246 #endif