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 local NAT="ip6tables -t nat"
   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 setup_masquerading() {
  71         local cmd="$1"
  72         local chain="network6_masquerade_$2"
  73         local device="$3"
  74
  75         $NAT -D POSTROUTING -j "$chain" 2>/dev/null && {
  76                 $NAT -F "$chain" 2>/dev/null
  77                 $NAT -X "$chain" 2>/dev/null
  78         }
  79
  80         [ "$cmd" != "stop" ] && {
  81                 $NAT -N "$chain"
  82                 $NAT -A "$chain" -o "$device" -j MASQUERADE
  83                 $NAT -A POSTROUTING -j "$chain"
  84         }
  85 }
  86
  87
  88 setup_npt_chain() {
  89         local cmd="$1"
  90         local network="$2"
  91         local chain="network6_npt_$network"
  92
  93         [ "$cmd" != "start" ] && {
  94                 $NAT -D POSTROUTING -j "$chain" 2>/dev/null && {
  95                         $NAT -D PREROUTING -j "$chain" 2>/dev/null
  96                         $NAT -F "$chain" 2>/dev/null
  97                         $NAT -X "$chain" 2>/dev/null
  98                 }
  99         }
 100
 101         [ "$cmd" != "stop" ] && {
 102                 $NAT -N "$chain" 2>/dev/null && {
 103                         $NAT -A PREROUTING -j "$chain"
 104                         $NAT -A POSTROUTING -j "$chain"
 105                 }
 106         }
 107 }
 108
 109
 110 announce_prefix() {
 111         local prefix="$1"
 112         local network="$2"
 113         local cmd="$3"
 114
 115         local addr=$(echo "$prefix" | cut -d/ -f1)
 116         local rem=$(echo "$prefix" | cut -d/ -f2)
 117         local length=$(echo "$rem" | cut -d, -f1)
 118         local prefer=""
 119         local valid=""
 120
 121         # If preferred / valid provided
 122         [ "$rem" != "$length" ] && {
 123                 prefer=$(echo "$rem" | cut -d, -f2)
 124                 valid=$(echo "$rem" | cut -d, -f3)
 125         }
 126
 127         # Get prefix configuration
 128         local ula=""
 129         local prefix_action=""
 130         config_get ula global ula_prefix
 131         config_get prefix_action "$network" prefix_action
 132         [ -z "$prefix_action" ] && prefix_action="distribute"
 133
 134         # Always announce the ULA when doing NPT
 135         [ "$prefix" == "$ula" -a "$prefix_action" == "npt" ] && prefix_action="distribute"
 136
 137         [ "$prefix_action" == "distribute" ] && {
 138                 local msg='{"network": "'"$network"'", "prefix": "'"$addr"'", "length": '"$length"
 139                 [ -n "$valid" ] && msg="$msg"', "valid": '"$valid"', "preferred": '"$prefer"
 140                 [ -z "$cmd" ] && cmd=newprefix
 141
 142                 ubus call 6distributed "$cmd" "$msg}"
 143         }
 144
 145         [ "$prefix_action" == "npt" ] && {
 146                 local chain="network6_npt_$network"
 147                 local ula_addr=$(echo "$ula" | cut -d/ -f1)
 148                 local ula_rem=$(echo "$ula" | cut -d/ -f2)
 149                 local ula_length=$(echo "$ula_rem" | cut -d, -f1)
 150                 local device=""
 151
 152                 network_get_device device "$network"
 153                 [ "$length" -lt "$ula_length" ] && length="$ula_length"
 154                 [ "$cmd" == "delprefix" ] && cmd="-D $chain" || cmd="-A $chain"
 155
 156                 local in="-i $device -d $addr/$length -j NETMAP --to $ula_addr/$ula_length"
 157                 local out="-o $device -s $ula_addr/$ula_length -j NETMAP --to $addr/$length"
 158
 159                 setup_npt_chain start "$network"
 160                 $NAT $cmd $in
 161                 $NAT $cmd $out
 162         }
 163 }
 164
 165
 166 disable_router() {
 167         local network="$1"
 168
 169         # Notify the address distribution daemon
 170         ubus call 6distributed deliface '{"network": "'"$network"'"}'
 171
 172         # Disable advertisement daemon
 173         stop_service /usr/sbin/6relayd "/var/run/ipv6-router-$network.pid"
 174 }
 175
 176
 177 restart_relay_slave() {
 178         local __section="$1"
 179         local __master="$2"
 180
 181         network_is_up "$__section" || return
 182
 183         local __device=""
 184         network_get_device __device "$__section"
 185
 186         local __cmaster=""
 187         config_get __cmaster "$__section" relay_master
 188
 189         [ "$__master" == "$__cmaster" ] && {
 190                 disable_interface "$__section"
 191                 enable_interface "$__section" "$__device"
 192         }
 193 }
 194
 195
 196 add_relay_slave() {
 197         local __section="$1"
 198         local __return="$2"
 199         local __master="$3"
 200         local __mode="$4"
 201
 202         network_is_up "$__section" || return
 203
 204         # Get device
 205         local __device=""
 206         network_get_device __device "$__section"
 207
 208         # Match master network
 209         local __cmaster=""
 210         config_get __cmaster "$__section" relay_master
 211         [ "$__master" == "$__cmaster" ] || return
 212
 213         # Test slave  mode
 214         local __cmode=""
 215         config_get __cmode "$__section" mode
 216         [ "$__cmode" == "downstream" ] && __cmode="router"
 217
 218         # Don't start fallback interfaces if we are in forced-relay mode
 219         [ "$__cmode" == "relay" -o "$__mode" == "fallback" ] || return
 220
 221         # Don't make non-relay or non-router interfaces slaves
 222         [ "$__cmode" == "relay" -o "$__cmode" == "router" ] || return
 223
 224         # Disable any active distribution
 225         [ "$__cmode" == "router" ] && disable_router "$__section"
 226
 227         # Configure interface to accept RA and send RS
 228         conf_set "$__device" accept_ra 2
 229         conf_set "$__device" forwarding 2
 230
 231         eval "$__return"'="$'"$__return"' '"$__device"'"'
 232 }
 233
 234
 235 stop_relay() {
 236         local network="$1"
 237         local pid_fallback="/var/run/ipv6-relay-fallback-$network.pid"
 238         local pid_forced="/var/run/ipv6-relay-forced-$network.pid"
 239         local was_fallback=""
 240
 241         stop_service /usr/sbin/6relayd "$pid_fallback" was_fallback
 242         stop_service /usr/sbin/6relayd "$pid_forced"
 243
 244         # Reenable normal distribution on slave interfaces
 245         [ -n "$was_fallback" ] && config_foreach restart_relay_slave interface "$network"
 246 }
 247
 248
 249 detect_forced_relay_mode() {
 250         local __section="$1"
 251         local __mode="$2"
 252
 253         local __cmode
 254         config_get __cmode "$__section" mode
 255         [ "$__cmode" == "relay" ] && eval "$__mode=forced"
 256 }
 257
 258
 259 restart_relay() {
 260         local network="$1"
 261         local mode="$2"
 262
 263         # Stop last active relay
 264         stop_relay "$network"
 265
 266         # Detect if we have a forced-relay
 267         [ -z "$mode" ] && config_foreach detect_forced_relay_mode interface mode
 268
 269         # Don't start without a mode
 270         [ -z "$mode" ] && return
 271
 272         # Detect master device
 273         local device=""
 274         network_get_device device "$network"
 275
 276         # Generate command string
 277         local cmd="/usr/sbin/6relayd -A $device"
 278         local ifaces=""
 279         config_foreach add_relay_slave interface ifaces "$network" "$mode"
 280
 281         # Start relay
 282         local pid="/var/run/ipv6-relay-$mode-$network.pid"
 283         [ -n "$ifaces" ] && start_service "$cmd $ifaces" "$pid"
 284
 285         # There are no slave interface, however indicate that we want to relay
 286         [ -z "$ifaces" ] && touch "$pid"
 287 }
 288
 289
 290 setup_prefix_fallback() {
 291         local cmd="$1"
 292         local network="$2"
 293         local device="$3"
 294
 295         stop_relay "$network"
 296         restart_relay "$network"
 297
 298         setup_masquerading stop "$network"
 299
 300         [ "$cmd" != "stop" ] && {
 301                 local fallback=""
 302                 config_get fallback "$network" prefix_fallback
 303
 304                 [ "$fallback" == "relay" ] && restart_relay "$network" fallback
 305                 [ "$fallback" == "masquerade" ] && setup_masquerading start "$network" "$device"
 306         }
 307 }
 308
 309
 310 restart_master_relay() {
 311         local network="$1"
 312         local mode="$2"
 313         local pid_fallback="/var/run/ipv6-relay-fallback-$network.pid"
 314         local pid_forced="/var/run/ipv6-relay-forced-$network.pid"
 315
 316         # Disable active relaying to this interface
 317         config_get relay_master "$network" relay_master
 318         [ -z "$relay_master" ] && return
 319         network_is_up "$relay_master" || return
 320
 321         # Detect running mode
 322         [ -z "$mode" && -f "$pid_fallback" ] && mode="fallback"
 323         [ -z "$mode" && -f "$pid_forced" ] && mode="forced"
 324
 325         # Restart relay if running or start requested
 326         [ -n "$mode" ] && restart_relay "$relay_master" "$mode"
 327 }
 328
 329
 330 disable_interface() {
 331         local network="$1"
 332
 333         # Delete all prefixes routed to this interface
 334         ubus call 6distributed delprefix '{"network": "'"$network"'"}'
 335
 336         # Restart Relay
 337         restart_master_relay "$network"
 338
 339         # Disable distribution
 340         disable_router "$network"
 341
 342         # Disable any active relays, masquerading rules and NPT rules
 343         stop_relay "$network"
 344         setup_masquerading stop "$network"
 345         setup_npt_chain stop "$network"
 346
 347         # Disable DHCPv6 client if enabled, state script will take care
 348         stop_service /usr/sbin/odhcp6c "/var/run/ipv6-dhcpv6-$network.pid"
 349 }
 350
 351
 352 enable_ula_prefix() {
 353         local network="$1"
 354         local ula="$2"
 355         [ -z "$ula" ] && ula="global"
 356
 357         # ULA-integration
 358         local ula_prefix=""
 359         config_get ula_prefix "$ula" ula_prefix
 360
 361         # ULA auto configuration (first init)
 362         [ "$ula_prefix" == "auto" ] && {
 363                 local r1=""
 364                 local r2=""
 365                 local r3=""
 366
 367                 # Sometimes results are empty, therefore try until it works...
 368                 while [ -z "$r1" -o -z "$r2" -o -z "$r3" ]; do
 369                         r1=$(printf "%02x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 256)))
 370                         r2=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
 371                         r3=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
 372                 done
 373
 374                 ula_prefix="fd$r1:$r2:$r3::/48"
 375
 376                 # Save prefix so it will be preserved across reboots
 377                 config_set "$ula" ula_prefix "$ula_prefix"
 378                 uci_set network6 "$ula" ula_prefix "$ula_prefix"
 379                 uci_commit network6
 380         }
 381
 382         # Announce ULA
 383         [ -n "$ula_prefix" ] && announce_prefix "$ula_prefix" "$network"
 384 }
 385
 386
 387 enable_static() {
 388         local network="$1"
 389         local device="$2"
 390
 391         # Enable global forwarding
 392         local global_forward
 393         conf_get global_forward all forwarding
 394         [ "$global_forward" != "1" ] && conf_set all forwarding 1
 395
 396         # Configure device
 397         conf_set "$device" accept_ra 1
 398         conf_set "$device" forwarding 1
 399
 400         # Enable ULA
 401         enable_ula_prefix "$network"
 402         # Compatibility (deprecated)
 403         enable_ula_prefix "$network" "$network"
 404
 405         # Announce all static prefixes
 406         config_list_foreach "$network" static_prefix announce_prefix $network
 407
 408         # start relay if there are forced relay members
 409         restart_relay "$network"
 410 }
 411
 412
 413 enable_router() {
 414         local network="$1"
 415         local device="$2"
 416
 417         # Get IPv6 prefixes
 418         local length
 419         config_get length "$network" advertise_prefix
 420         [ -z "$length" ] && length=64
 421         [ "$length" -ne "0" ] && ubus call 6distributed newiface '{"network": "'"$network"'", "iface": "'"$device"'", "length": '"$length"'}'
 422
 423         # Start RD & DHCPv6 service
 424         local pid="/var/run/ipv6-router-$network.pid"
 425         start_service "/usr/sbin/6relayd -S . $device" "$pid"
 426
 427         # Try relaying if necessary
 428         restart_master_relay "$network"
 429 }
 430
 431
 432 enable_dhcpv6() {
 433         local network="$1"
 434         local device="$2"
 435
 436         # Configure device
 437         conf_set "$device" accept_ra 2
 438         conf_set "$device" forwarding 2
 439
 440         # Trigger RS
 441         conf_set "$device" disable_ipv6 1
 442         conf_set "$device" disable_ipv6 0
 443
 444         # Configure DHCPv6-client
 445         local dhcp6_opts="$device"
 446
 447         # Configure DHCPv6-client (e.g. requested prefix)
 448         local request_prefix
 449         config_get request_prefix "$network" request_prefix
 450         [ -z "$request_prefix" ] && request_prefix="auto"
 451         [ "$request_prefix" != "no" ] && {
 452                 [ "$request_prefix" == "auto" ] && request_prefix=0
 453                 dhcp6_opts="-P$request_prefix $dhcp6_opts"
 454         }
 455
 456         # Start DHCPv6 client
 457         local pid="/var/run/ipv6-dhcpv6-$network.pid"
 458         start_service "/usr/sbin/odhcp6c -s/lib/ipv6/dhcpv6.sh $dhcp6_opts" "$pid"
 459
 460         # Refresh RA on all interfaces
 461         for pid in /var/run/ipv6-router-*.pid; do
 462                 kill -SIGUSR1 $(cat "$pid")
 463         done
 464 }
 465
 466
 467 enable_6to4() {
 468         local network="$1"
 469         local device="$2"
 470         local mode="$3"
 471
 472         local prefixlen="48"
 473         [ "$mode" == "6rd" ] && {
 474                 local ip4prefix=$(uci_get network "$network" ip4prefixlen 0)
 475                 local ip6prefix=$(uci_get network "$network" ip6prefixlen 32)
 476                 prefixlen=$(($ip6prefix + 32 - $ip4prefix))
 477         }
 478
 479         local prefix=""
 480         network_get_ipaddr6 prefix "$network"
 481
 482         announce_prefix "$prefix/$prefixlen" "$network"
 483 }
 484
 485
 486 enable_interface()
 487 {
 488         local network="$1"
 489         local device="$2"
 490         local mode=""
 491
 492         config_get mode "$network" mode
 493         [ -n "$mode" -a "$mode" != "none" ] || return
 494
 495         # Compatibility with old mode names
 496         [ "$mode" == "downstream" ] && mode=router
 497         [ "$mode" == "upstream" ] && mode=dhcpv6
 498
 499         # Run mode startup code
 500         enable_static "$network" "$device"
 501         [ "$mode" == "dhcpv6" ] && enable_dhcpv6 "$network" "$device"
 502         [ "$mode" == "router" ] && enable_router "$network" "$device"
 503         [ "$mode" == "6to4" -o "$mode" == "6rd" ] && enable_6to4 "$network" "$device" "$mode"
 504         [ "$mode" == "relay" ] && restart_master_relay "$network" forced
 505 }