functions.ipv6

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 IP_SUPPORTED_PROTOCOLS="${IP_SUPPORTED_PROTOCOLS} ipv6"
  23
  24 function ipv6_init() {
  25         log INFO "Initializing IPv6 networking."
  26
  27         # Enable forwarding on all devices
  28         ipv6_device_forwarding_disable all
  29         ipv6_device_forwarding_disable default
  30
  31         # Disable autoconfiguration on all devices per default
  32         ipv6_device_autoconf_disable all
  33         ipv6_device_autoconf_disable default
  34
  35         # XXX do we need this?
  36         #local device
  37         #for device in $(devices_get_all); do
  38         #       ipv6_device_forwarding_disable ${device}
  39         #       ipv6_device_autoconf_disable ${device}
  40         #done
  41 }
  42
  43 init_register ipv6_init
  44
  45 function ipv6_device_autoconf_enable() {
  46         local device=${1}
  47
  48         assert isset device
  49
  50         # Allow setting default and all settings
  51         if ! isoneof device all default; then
  52                 assert device_exists ${device}
  53         fi
  54
  55         local val
  56         for val in accept_ra accept_redirects; do
  57                 echo 1 > /proc/sys/net/ipv6/conf/${device}/${val}
  58         done
  59 }
  60
  61 function ipv6_device_autoconf_disable() {
  62         local device=${1}
  63
  64         assert isset device
  65
  66         # Allow setting default and all settings
  67         if ! isoneof device all default; then
  68                 assert device_exists ${device}
  69         fi
  70
  71         local val
  72         for val in accept_ra accept_redirects; do
  73                 echo 0 > /proc/sys/net/ipv6/conf/${device}/${val}
  74         done
  75 }
  76
  77 function ipv6_device_forwarding_enable() {
  78         local device=${1}
  79
  80         assert isset device
  81
  82         # Allow setting default and all settings
  83         if ! isoneof device all default; then
  84                 assert device_exists ${device}
  85         fi
  86
  87         echo 1 > /proc/sys/net/ipv6/conf/${device}/forwarding
  88 }
  89
  90 function ipv6_device_forwarding_disable() {
  91         local device=${1}
  92
  93         assert isset device
  94
  95         # Allow setting default and all settings
  96         if ! isoneof device all default; then
  97                 assert device_exists ${device}
  98         fi
  99
 100         echo 0 > /proc/sys/net/ipv6/conf/${device}/forwarding
 101 }
 102
 103 # Enable IPv6 RFC3041 privacy extensions if desired
 104 function ipv6_device_privacy_extensions_enable() {
 105         local device=${1}
 106         local type=${2}
 107
 108         assert isset device
 109         assert device_exists ${device}
 110
 111         # Default value is rfc3041
 112         if [ -z "${type}" ]; then
 113                 type="rfc3041"
 114         fi
 115
 116         assert isset type
 117
 118         case "${type}" in
 119                 rfc3041)
 120                         echo 2 > /proc/sys/net/ipv6/conf/${device}/use_tempaddr
 121                         ;;
 122                 *)
 123                         error_log "Given type '${type}' is not supported."
 124                         return ${EXIT_ERROR}
 125                         ;;
 126         esac
 127
 128         return ${EXIT_OK}
 129 }
 130
 131 function ipv6_device_privacy_extensions_disable() {
 132         local device=${1}
 133
 134         assert isset device
 135         assert device_exists ${device}
 136
 137         echo 0 > /proc/sys/net/ipv6/conf/${device}/use_tempaddr
 138 }
 139
 140 function ipv6_is_valid() {
 141         local address=${1}
 142
 143         assert isset address
 144
 145         # Check length
 146         [ ${#address} -gt 39 ] && return ${EXIT_ERROR}
 147
 148         # XXX find :: twice?
 149         # XXX check for documentation prefix?
 150
 151         # Check for bad characters
 152         local char
 153         for char in 0 1 2 3 4 5 6 7 8 9 a b c d e f :; do
 154                 address=${address//${char}/}
 155         done
 156         [ -n "${address}" ] && return ${EXIT_ERROR}
 157
 158         return ${EXIT_OK}
 159 }
 160
 161 function ipv6_implode() {
 162         local address=${1}
 163
 164         assert isset address
 165
 166         if ! ipv6_is_valid ${address}; then
 167                 error "IPv6 address is invalid: ${address}"
 168                 return ${EXIT_ERROR}
 169         fi
 170
 171         # Make proper address in exploded format
 172         address=$(ipv6_explode ${address})
 173
 174         local block
 175         local char
 176         local i
 177
 178         local address_new
 179         local block_new
 180
 181         for block in ${address//:/\ }; do
 182                 block_new=
 183                 for i in $(seq 0 ${#block}); do
 184                         char="${block:${i}:1}"
 185
 186                         [ -z "${char}" ] && continue
 187
 188                         if [ -z "${block_new}" ] && [ "${char}" = "0" ]; then
 189                                 continue
 190                         fi
 191
 192                         block_new="${block_new}${char}"
 193                 done
 194
 195                 [ -z "${block_new}" ] && block_new="0"
 196
 197                 address_new="${address_new}:${block_new}"
 198         done
 199
 200         # Cut first colon (:)
 201         address="${address_new:1:${#address_new}}"
 202
 203         local match
 204         local matches=()
 205         local pattern
 206         local pos_start
 207         local pos_next
 208         for pos_start in $(seq 0 ${#address}); do
 209                 matches["${pos_start}"]=0
 210
 211                 for pos_next in $(seq ${pos_start} 2 ${#address}); do
 212                         case "${pos_start}" in
 213                                 0)
 214                                         match="${address:${pos_next}:2}"
 215                                         pattern="0:"
 216                                         ;;
 217                                 *)
 218                                         match="${address:${pos_next}:2}"
 219                                         pattern=":0"
 220                                         ;;
 221                         esac
 222
 223                         [ -z "${match}" ] && continue
 224
 225                         if [ "${match}" = "${pattern}" ]; then
 226                                 matches[${pos_start}]=$(( matches[${pos_start}] + 1))
 227                         else
 228                                 break
 229                         fi
 230                 done
 231         done
 232
 233         local pos_best
 234         local pos_best_val=0
 235         for i in $(seq 0 ${#matches[@]}); do
 236                 [ -z "${matches[${i}]}" ] && continue
 237
 238                 if [ ${matches[${i}]} -gt ${pos_best_val} ]; then
 239                         pos_best=${i}
 240                         pos_best_val=${matches[${i}]}
 241                 fi
 242         done
 243
 244         if [ -n "${pos_best}" ]; then
 245                 address_new="${address:0:${pos_best}}::"
 246
 247                 local pos_end=$(( ${pos_best_val} * 2 + ${pos_best} + 1))
 248
 249                 if [ "${pos_best}" = "0" ]; then
 250                         pos_end=$(( ${pos_end} - 1 ))
 251                 fi
 252
 253                 address="${address_new}${address:${pos_end}:${#address}}"
 254         fi
 255
 256         assert ipv6_is_valid ${address}
 257
 258         echo "${address}"
 259 }
 260
 261 function ipv6_explode() {
 262         local address=${1}
 263
 264         assert isset address
 265
 266         if [ ${#address} -eq 39 ]; then
 267                 echo "${address}"
 268                 return ${EXIT_OK}
 269         fi
 270
 271         address=${address//::/:X:}
 272
 273         local block
 274         local block_count=0
 275         local block_id
 276         local block_max=8
 277         local blocks=()
 278
 279         for block in ${address//:/\ }; do
 280                 blocks[${block_count}]=${block}
 281
 282                 block_count=$(( ${block_count} + 1 ))
 283         done
 284
 285         if [ ${#blocks[@]} -lt ${block_max} ]; then
 286                 for block_id in $(seq ${#blocks[@]} -1 0); do
 287                         block=${blocks[${block_id}]}
 288
 289                         [ -z "${block}" ] && continue
 290
 291                         if [ "${block}" = "X" ]; then
 292                                 blocks[${block_id}]="0000"
 293                                 break
 294                         fi
 295
 296                         blocks[$(( ${block_max} - ${block_count} + ${block_id} ))]=${block}
 297                         blocks[${block_id}]="0000"
 298                 done
 299         fi
 300
 301         for block_id in $(seq 0 ${#blocks[@]}); do
 302                 block=${blocks[${block_id}]}
 303
 304                 [ -z "${block}" ] && block="0000"
 305
 306                 while [ "${#block}" -lt 4 ]; do
 307                         block="0${block}"
 308                 done
 309
 310                 blocks[${block_id}]=${block}
 311         done
 312
 313         address=
 314         for block in ${blocks[@]}; do
 315                 address="${address}:${block}"
 316         done
 317         address=${address:1:39}
 318
 319         assert ipv6_is_valid ${address}
 320
 321         echo "${address}"
 322 }
 323
 324 function ipv6_hash() {
 325         local address=${1}
 326
 327         assert isset address
 328
 329         # Explode address
 330         address=$(ipv6_explode ${address})
 331
 332         echo "${address//:/}"
 333 }