package/network/ipv6/ipv6-support/files/support.sh

   1 #!/bin/sh
   2 # Copyright (c) 2012 OpenWrt.org
   3 . /lib/functions.sh
   4 . /lib/functions/service.sh
   5 . /lib/functions/network.sh
   6
   7 config_load network6
   8
   9
  10 conf_get() {
  11         local __return="$1"
  12         local __device="$2"
  13         local __option="$3"
  14         local __value=$(cat "/proc/sys/net/ipv6/conf/$device/$option")
  15         eval "$__return=$__value"
  16 }
  17
  18
  19 conf_set() {
  20         local device="$1"
  21         local option="$2"
  22         local value="$3"
  23         echo "$value" > "/proc/sys/net/ipv6/conf/$device/$option"
  24 }
  25
  26
  27 stop_service() {
  28         local __exe="$1"
  29         SERVICE_PID_FILE="$2"
  30         local __return="$3"
  31
  32         service_check "$__exe" && {
  33                 service_stop "$__exe"
  34                 [ -n "$__return" ] && eval "$__return=1"
  35         }
  36         rm -f "$SERVICE_PID_FILE"
  37 }
  38
  39
  40 start_service() {
  41         local cmd="$1"
  42         local pidfile="$2"
  43
  44         SERVICE_DAEMONIZE=1
  45         SERVICE_WRITE_PID=1
  46         SERVICE_PID_FILE="$pidfile"
  47         service_start $cmd
  48 }
  49
  50
  51 resolve_network_add() {
  52         local __section="$1"
  53         local __device="$2"
  54         local __return="$3"
  55         local __cdevice
  56         network_get_device __cdevice "$__section"
  57         [ "$__cdevice" != "$__device" ] && return
  58
  59         eval "$__return"'="'"$__section"'"'
  60 }
  61
  62
  63 resolve_network() {
  64         local __return="$1"
  65         local __device="$2"
  66         config_foreach resolve_network_add interface "$__device" "$__return"
  67 }
  68
  69
  70 announce_prefix() {
  71         local prefix="$1"
  72         local network="$2"
  73         local cmd="$3"
  74
  75         local addr=$(echo "$prefix" | cut -d/ -f1)
  76         local rem=$(echo "$prefix" | cut -d/ -f2)
  77         local length=$(echo "$rem" | cut -d, -f1)
  78         local prefer=""
  79         local valid=""
  80
  81         # If preferred / valid provided
  82         [ "$rem" != "$length" ] && {
  83                 prefer=$(echo "$rem" | cut -d, -f2)
  84                 valid=$(echo "$rem" | cut -d, -f3)
  85         }
  86
  87         local msg='{"network": "'"$network"'", "prefix": "'"$addr"'", "length": '"$length"
  88         [ -n "$valid" ] && msg="$msg"', "valid": '"$valid"', "preferred": '"$prefer"
  89         [ -z "$cmd" ] && cmd=newprefix
  90
  91         ubus call 6distributed "$cmd" "$msg}"
  92 }
  93
  94
  95 disable_router() {
  96         local network="$1"
  97
  98         # Notify the address distribution daemon
  99         ubus call 6distributed deliface '{"network": "'"$network"'"}'
 100
 101         # Disable advertisement daemon
 102         stop_service /usr/sbin/6relayd "/var/run/ipv6-router-$network.pid"
 103 }
 104
 105
 106 restart_relay_slave() {
 107         local __section="$1"
 108         local __master="$2"
 109
 110         network_is_up "$__section" || return
 111
 112         local __device=""
 113         network_get_device __device "$__section"
 114
 115         local __cmaster=""
 116         config_get __cmaster "$__section" relay_master
 117
 118         [ "$__master" == "$__cmaster" ] && {
 119                 disable_interface "$__section"
 120                 enable_interface "$__section" "$__device"
 121         }
 122 }
 123
 124
 125 add_relay_slave() {
 126         local __section="$1"
 127         local __return="$2"
 128         local __master="$3"
 129         local __mode="$4"
 130
 131         network_is_up "$__section" || return
 132
 133         # Get device
 134         local __device=""
 135         network_get_device __device "$__section"
 136
 137         # Match master network
 138         local __cmaster=""
 139         config_get __cmaster "$__section" relay_master
 140         [ "$__master" == "$__cmaster" ] || return
 141
 142         # Test slave  mode
 143         local __cmode=""
 144         config_get __cmode "$__section" mode
 145         [ "$__cmode" == "downstream" ] && __cmode="router"
 146
 147         # Don't start fallback interfaces if we are in forced-relay mode
 148         [ "$__cmode" == "relay" -o "$__mode" == "fallback" ] || return
 149
 150         # Don't make non-relay or non-router interfaces slaves
 151         [ "$__cmode" == "relay" -o "$__cmode" == "router" ] || return
 152
 153         # Disable any active distribution
 154         [ "$__cmode" == "router" ] && disable_router "$__section"
 155
 156         # Configure interface to accept RA and send RS
 157         conf_set "$__device" accept_ra 2
 158         conf_set "$__device" forwarding 2
 159
 160         eval "$__return"'="$'"$__return"' '"$__device"'"'
 161 }
 162
 163
 164 stop_relay() {
 165         local network="$1"
 166         local pid_fallback="/var/run/ipv6-relay-fallback-$network.pid"
 167         local pid_forced="/var/run/ipv6-relay-forced-$network.pid"
 168         local was_fallback=""
 169
 170         stop_service /usr/sbin/6relayd "$pid_fallback" was_fallback
 171         stop_service /usr/sbin/6relayd "$pid_forced"
 172
 173         # Reenable normal distribution on slave interfaces
 174         [ -n "$was_fallback" ] && config_foreach restart_relay_slave interface "$network"
 175 }
 176
 177
 178 detect_forced_relay_mode() {
 179         local __section="$1"
 180         local __mode="$2"
 181
 182         local __cmode
 183         config_get __cmode "$__section" mode
 184         [ "$__cmode" == "relay" ] && eval "$__mode=forced"
 185 }
 186
 187
 188 restart_relay() {
 189         local network="$1"
 190         local mode="$2"
 191
 192         # Stop last active relay
 193         stop_relay "$network"
 194
 195         # Detect if we have a forced-relay
 196         [ -z "$mode" ] && config_foreach detect_forced_relay_mode interface mode
 197
 198         # Don't start without a mode
 199         [ -z "$mode" ] && return
 200
 201         # Detect master device
 202         local device=""
 203         network_get_device device "$network"
 204
 205         # Generate command string
 206         local cmd="/usr/sbin/6relayd -A $device"
 207         local ifaces=""
 208         config_foreach add_relay_slave interface ifaces "$network" "$mode"
 209
 210         # Start relay
 211         local pid="/var/run/ipv6-relay-$mode-$network.pid"
 212         [ -n "$ifaces" ] && start_service "$cmd $ifaces" "$pid"
 213
 214         # There are no slave interface, however indicate that we want to relay
 215         [ -z "$ifaces" ] && touch "$pid"
 216 }
 217
 218
 219 restart_master_relay() {
 220         local network="$1"
 221         local mode="$2"
 222         local pid_fallback="/var/run/ipv6-relay-fallback-$network.pid"
 223         local pid_forced="/var/run/ipv6-relay-forced-$network.pid"
 224
 225         # Disable active relaying to this interface
 226         config_get relay_master "$network" relay_master
 227         [ -z "$relay_master" ] && return
 228         network_is_up "$relay_master" || return
 229
 230         # Detect running mode
 231         [ -z "$mode" && -f "$pid_fallback" ] && mode="fallback"
 232         [ -z "$mode" && -f "$pid_forced" ] && mode="forced"
 233
 234         # Restart relay if running or start requested
 235         [ -n "$mode" ] && restart_relay "$relay_master" "$mode"
 236 }
 237
 238
 239 disable_interface() {
 240         local network="$1"
 241
 242         # Delete all prefixes routed to this interface
 243         ubus call 6distributed delprefix '{"network": "'"$network"'"}'
 244
 245         # Restart Relay
 246         restart_master_relay "$network"
 247
 248         # Disable distribution
 249         disable_router "$network"
 250
 251         # Disable relay
 252         stop_relay "$network"
 253
 254         # Disable DHCPv6 client if enabled, state script will take care
 255         stop_service /usr/sbin/odhcp6c "/var/run/ipv6-dhcpv6-$network.pid"
 256 }
 257
 258
 259 enable_static() {
 260         local network="$1"
 261         local device="$2"
 262
 263         # Enable global forwarding
 264         local global_forward
 265         conf_get global_forward all forwarding
 266         [ "$global_forward" != "1" ] && conf_set all forwarding 1
 267
 268         # Configure device
 269         conf_set "$device" accept_ra 1
 270         conf_set "$device" forwarding 1
 271
 272         # ULA-integration
 273         local ula_prefix=""
 274         config_get ula_prefix "$network" ula_prefix
 275
 276         # ULA auto configuration (first init)
 277         [ "$ula_prefix" == "auto" ] && {
 278                 local r1=""
 279                 local r2=""
 280                 local r3=""
 281
 282                 # Sometimes results are empty, therefore try until it works...
 283                 while [ -z "$r1" -o -z "$r2" -o -z "$r3" ]; do
 284                         r1=$(printf "%02x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 256)))
 285                         r2=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
 286                         r3=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
 287                 done
 288
 289                 ula_prefix="fd$r1:$r2:$r3::/48"
 290
 291                 # Save prefix so it will be preserved across reboots
 292                 uci_set network6 "$network" ula_prefix "$ula_prefix"
 293                 uci_commit network6
 294         }
 295
 296         # Announce ULA
 297         [ -n "$ula_prefix" ] && announce_prefix $ula_prefix $network
 298
 299         # Announce all static prefixes
 300         config_list_foreach "$network" static_prefix announce_prefix $network
 301
 302         # start relay if there are forced relay members
 303         restart_relay "$network"
 304 }
 305
 306
 307 enable_router() {
 308         local network="$1"
 309         local device="$2"
 310
 311         # Get IPv6 prefixes
 312         local length
 313         config_get length "$network" advertise_prefix
 314         [ -z "$length" ] && length=64
 315         [ "$length" -ne "0" ] && ubus call 6distributed newiface '{"network": "'"$network"'", "iface": "'"$device"'", "length": '"$length"'}'
 316
 317         # Start RD & DHCPv6 service
 318         local pid="/var/run/ipv6-router-$network.pid"
 319
 320         # Start server
 321         start_service "/usr/sbin/6relayd -S . $device" "$pid"
 322
 323         # Try relaying if necessary
 324         restart_master_relay "$network"
 325
 326         # start relay if there are forced relay members
 327         restart_relay "$network"
 328 }
 329
 330
 331 enable_dhcpv6() {
 332         local network="$1"
 333         local device="$2"
 334
 335         # Configure device
 336         conf_set "$device" accept_ra 2
 337         conf_set "$device" forwarding 2
 338
 339         # Trigger RS
 340         conf_set "$device" disable_ipv6 1
 341         conf_set "$device" disable_ipv6 0
 342
 343         # Configure DHCPv6-client
 344         local dhcp6_opts="$device"
 345
 346         # Configure DHCPv6-client (e.g. requested prefix)
 347         local request_prefix
 348         config_get request_prefix "$network" request_prefix
 349         [ -z "$request_prefix" ] && request_prefix="auto"
 350         [ "$request_prefix" != "no" ] && {
 351                 [ "$request_prefix" == "auto" ] && request_prefix=0
 352                 dhcp6_opts="-P$request_prefix $dhcp6_opts"
 353         }
 354
 355         # Start DHCPv6 client
 356         local pid="/var/run/ipv6-dhcpv6-$network.pid"
 357         start_service "/usr/sbin/odhcp6c -s/lib/ipv6/dhcpv6.sh $dhcp6_opts" "$pid"
 358
 359         # Refresh RA on all interfaces
 360         for pid in /var/run/ipv6-router-*.pid; do
 361                 kill -SIGUSR1 $(cat "$pid")
 362         done
 363 }
 364
 365
 366 enable_6to4() {
 367         local network="$1"
 368         local device="$2"
 369         local mode="$3"
 370
 371         local prefixlen="48"
 372         [ "$mode" == "6rd" ] && {
 373                 local ip4prefix=$(uci_get network "$network" ip4prefixlen 0)
 374                 local ip6prefix=$(uci_get network "$network" ip6prefixlen 32)
 375                 prefixlen=$(($ip6prefix + 32 - $ip4prefix))
 376         }
 377
 378         local prefix=""
 379         network_get_ipaddr6 prefix "$network"
 380
 381         announce_prefix "$prefix/$prefixlen" "$network"
 382 }
 383
 384
 385 enable_interface()
 386 {
 387         local network="$1"
 388         local device="$2"
 389         local mode=""
 390         config_get mode "$network" mode
 391
 392         # Compatibility with old mode names
 393         [ "$mode" == "downstream" ] && mode=router
 394         [ "$mode" == "upstream" ] && mode=dhcpv6
 395
 396         # Run mode startup code
 397         [ "$mode" == "dhcpv6" -o "$mode" == "static" ] && enable_static "$network" "$device"
 398         [ "$mode" == "dhcpv6" ] && enable_dhcpv6 "$network" "$device"
 399         [ "$mode" == "router" ] && enable_router "$network" "$device"
 400         [ "$mode" == "6to4" -o "$mode" == "6rd" ] && enable_6to4 "$network" "$device" "$mode"
 401         [ "$mode" == "relay" ] && restart_master_relay "$network" forced
 402 }