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         local type="$4"
 115
 116         local addr=$(echo "$prefix" | cut -d/ -f1)
 117         local rem=$(echo "$prefix" | cut -d/ -f2)
 118         local length=$(echo "$rem" | cut -d, -f1)
 119         local prefer=""
 120         local valid=""
 121
 122         # If preferred / valid provided
 123         [ "$rem" != "$length" ] && {
 124                 prefer=$(echo "$rem" | cut -d, -f2)
 125                 valid=$(echo "$rem" | cut -d, -f3)
 126         }
 127
 128         # Get prefix configuration
 129         local ula=""
 130         local prefix_action=""
 131         config_get ula global ula_prefix
 132         config_get prefix_action "$network" prefix_action
 133         [ -z "$prefix_action" ] && prefix_action="distribute"
 134
 135         # Always announce the ULA when doing NPT
 136         [ "$prefix" == "$ula" -a "$prefix_action" == "npt" ] && prefix_action="distribute"
 137
 138         [ "$prefix_action" == "distribute" -o "$prefix_action" == "npt" ] && {
 139                 local msg='{"network": "'"$network"'", "prefix": "'"$addr"'", "length": '"$length"
 140                 [ -n "$valid" ] && msg="$msg"', "valid": '"$valid"', "preferred": '"$prefer"
 141                 [ -z "$cmd" ] && cmd=newprefix
 142
 143                 [ "$prefix_action" == "npt" ] && msg="$msg"', "npt": 1'
 144                 [ "$type" == "secondary" ] && msg="$msg"', "secondary": 1'
 145                 ubus call 6distributed "$cmd" "$msg}"
 146         }
 147
 148         [ "$prefix_action" == "npt" ] && {
 149                 local chain="network6_npt_$network"
 150                 local ula_addr=$(echo "$ula" | cut -d/ -f1)
 151                 local ula_rem=$(echo "$ula" | cut -d/ -f2)
 152                 local ula_length=$(echo "$ula_rem" | cut -d, -f1)
 153                 local device=""
 154
 155                 network_get_device device "$network"
 156                 [ "$length" -lt "$ula_length" ] && length="$ula_length"
 157                 [ "$cmd" == "delprefix" ] && cmd="-D $chain" || cmd="-A $chain"
 158
 159                 local in="-i $device -d $addr/$length -j NETMAP --to $ula_addr/$ula_length"
 160                 local out="-o $device -s $ula_addr/$ula_length -j NETMAP --to $addr/$length"
 161
 162                 setup_npt_chain start "$network"
 163                 $NAT $cmd $in
 164                 $NAT $cmd $out
 165         }
 166 }
 167
 168
 169 disable_router() {
 170         local network="$1"
 171
 172         # Notify the address distribution daemon
 173         ubus call 6distributed deliface '{"network": "'"$network"'"}'
 174
 175
 176         # Start RD & DHCPv6 service
 177         local router_service
 178         config_get router_service global router_service
 179
 180         if [ "$router_service" == "dnsmasq" ]; then
 181                 rm -f "/var/etc/dnsmasq.d/ipv6-router-$network.conf"
 182                 /etc/init.d/dnsmasq restart
 183         else
 184                 stop_service /usr/sbin/6relayd "/var/run/ipv6-router-$network.pid"
 185         fi
 186 }
 187
 188
 189 restart_relay_slave() {
 190         local __section="$1"
 191         local __master="$2"
 192
 193         network_is_up "$__section" || return
 194
 195         local __device=""
 196         network_get_device __device "$__section"
 197
 198         local __cmaster=""
 199         config_get __cmaster "$__section" relay_master
 200
 201         [ "$__master" == "$__cmaster" ] && {
 202                 disable_interface "$__section"
 203                 enable_interface "$__section" "$__device"
 204         }
 205 }
 206
 207
 208 add_relay_slave() {
 209         local __section="$1"
 210         local __return="$2"
 211         local __master="$3"
 212         local __mode="$4"
 213
 214         network_is_up "$__section" || return
 215
 216         # Get device
 217         local __device=""
 218         network_get_device __device "$__section"
 219
 220         # Match master network
 221         local __cmaster=""
 222         config_get __cmaster "$__section" relay_master
 223         [ "$__master" == "$__cmaster" ] || return
 224
 225         # Test slave  mode
 226         local __cmode=""
 227         config_get __cmode "$__section" mode
 228         [ "$__cmode" == "downstream" ] && __cmode="router"
 229
 230         # Don't start fallback interfaces if we are in forced-relay mode
 231         [ "$__cmode" == "relay" -o "$__mode" == "fallback" ] || return
 232
 233         # Don't make non-relay or non-router interfaces slaves
 234         [ "$__cmode" == "relay" -o "$__cmode" == "router" ] || return
 235
 236         # Disable any active distribution
 237         [ "$__cmode" == "router" ] && disable_router "$__section"
 238
 239         # Configure interface to accept RA and send RS
 240         conf_set "$__device" accept_ra 2
 241         conf_set "$__device" forwarding 2
 242
 243         eval "$__return"'="$'"$__return"' '"$__device"'"'
 244 }
 245
 246
 247 stop_relay() {
 248         local network="$1"
 249         local pid_fallback="/var/run/ipv6-relay-fallback-$network.pid"
 250         local pid_forced="/var/run/ipv6-relay-forced-$network.pid"
 251         local was_fallback=""
 252
 253         stop_service /usr/sbin/6relayd "$pid_fallback" was_fallback
 254         stop_service /usr/sbin/6relayd "$pid_forced"
 255
 256         # Reenable normal distribution on slave interfaces
 257         [ -n "$was_fallback" ] && config_foreach restart_relay_slave interface "$network"
 258 }
 259
 260
 261 detect_forced_relay_mode() {
 262         local __section="$1"
 263         local __mode="$2"
 264
 265         local __cmode
 266         config_get __cmode "$__section" mode
 267         [ "$__cmode" == "relay" ] && eval "$__mode=forced"
 268 }
 269
 270
 271 restart_relay() {
 272         local network="$1"
 273         local mode="$2"
 274
 275         # Stop last active relay
 276         stop_relay "$network"
 277
 278         # Detect if we have a forced-relay
 279         [ -z "$mode" ] && config_foreach detect_forced_relay_mode interface mode
 280
 281         # Don't start without a mode
 282         [ -z "$mode" ] && return
 283
 284         # Detect master device
 285         local device=""
 286         network_get_device device "$network"
 287
 288         # Generate command string
 289         local cmd="/usr/sbin/6relayd -A $device"
 290         local ifaces=""
 291         config_foreach add_relay_slave interface ifaces "$network" "$mode"
 292
 293         # Start relay
 294         local pid="/var/run/ipv6-relay-$mode-$network.pid"
 295         [ -n "$ifaces" ] && start_service "$cmd $ifaces" "$pid"
 296
 297         # There are no slave interface, however indicate that we want to relay
 298         [ -z "$ifaces" ] && touch "$pid"
 299 }
 300
 301
 302 setup_prefix_fallback() {
 303         local cmd="$1"
 304         local network="$2"
 305         local device="$3"
 306
 307         stop_relay "$network"
 308         restart_relay "$network"
 309
 310         setup_masquerading stop "$network"
 311
 312         [ "$cmd" != "stop" ] && {
 313                 local fallback=""
 314                 config_get fallback "$network" prefix_fallback
 315
 316                 [ "$fallback" == "relay" ] && restart_relay "$network" fallback
 317                 [ "$fallback" == "masquerade" ] && setup_masquerading start "$network" "$device"
 318         }
 319 }
 320
 321
 322 restart_master_relay() {
 323         local network="$1"
 324         local mode="$2"
 325         local pid_fallback="/var/run/ipv6-relay-fallback-$network.pid"
 326         local pid_forced="/var/run/ipv6-relay-forced-$network.pid"
 327
 328         # Disable active relaying to this interface
 329         config_get relay_master "$network" relay_master
 330         [ -z "$relay_master" ] && return
 331         network_is_up "$relay_master" || return
 332
 333         # Detect running mode
 334         [ -z "$mode" && -f "$pid_fallback" ] && mode="fallback"
 335         [ -z "$mode" && -f "$pid_forced" ] && mode="forced"
 336
 337         # Restart relay if running or start requested
 338         [ -n "$mode" ] && restart_relay "$relay_master" "$mode"
 339 }
 340
 341
 342 disable_interface() {
 343         local network="$1"
 344
 345         # Delete all prefixes routed to this interface
 346         ubus call 6distributed delprefix '{"network": "'"$network"'"}'
 347
 348         # Restart Relay
 349         restart_master_relay "$network"
 350
 351         # Disable distribution
 352         disable_router "$network"
 353
 354         # Disable any active relays, masquerading rules and NPT rules
 355         stop_relay "$network"
 356         setup_masquerading stop "$network"
 357         setup_npt_chain stop "$network"
 358
 359         # Disable DHCPv6 client if enabled, state script will take care
 360         stop_service /usr/sbin/odhcp6c "/var/run/ipv6-dhcpv6-$network.pid"
 361 }
 362
 363
 364 enable_ula_prefix() {
 365         local network="$1"
 366         local ula="$2"
 367         [ -z "$ula" ] && ula="global"
 368
 369         # ULA-integration
 370         local ula_prefix=""
 371         config_get ula_prefix "$ula" ula_prefix
 372
 373         # ULA auto configuration (first init)
 374         [ "$ula_prefix" == "auto" ] && {
 375                 local r1=""
 376                 local r2=""
 377                 local r3=""
 378
 379                 # Sometimes results are empty, therefore try until it works...
 380                 while [ -z "$r1" -o -z "$r2" -o -z "$r3" ]; do
 381                         r1=$(printf "%02x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 256)))
 382                         r2=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
 383                         r3=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
 384                 done
 385
 386                 ula_prefix="fd$r1:$r2:$r3::/48"
 387
 388                 # Save prefix so it will be preserved across reboots
 389                 config_set "$ula" ula_prefix "$ula_prefix"
 390                 uci_set network6 "$ula" ula_prefix "$ula_prefix"
 391                 uci_commit network6
 392         }
 393
 394         # Announce ULA
 395         [ -n "$ula_prefix" ] && announce_prefix "$ula_prefix" "$network" newprefix secondary
 396 }
 397
 398
 399 enable_static() {
 400         local network="$1"
 401         local device="$2"
 402
 403         # Enable global forwarding
 404         local global_forward
 405         conf_get global_forward all forwarding
 406         [ "$global_forward" != "1" ] && conf_set all forwarding 1
 407
 408         # Configure device
 409         conf_set "$device" accept_ra 1
 410         conf_set "$device" forwarding 1
 411
 412         # Enable ULA
 413         enable_ula_prefix "$network"
 414         # Compatibility (deprecated)
 415         enable_ula_prefix "$network" "$network"
 416
 417         # Announce all static prefixes
 418         config_list_foreach "$network" static_prefix announce_prefix $network
 419
 420         # start relay if there are forced relay members
 421         restart_relay "$network"
 422 }
 423
 424
 425 enable_router() {
 426         local network="$1"
 427         local device="$2"
 428
 429         # Get IPv6 prefixes
 430         local length
 431         config_get length "$network" advertise_prefix
 432         [ -z "$length" ] && length=64
 433         [ "$length" -ne "0" ] && ubus call 6distributed newiface '{"network": "'"$network"'", "iface": "'"$device"'", "length": '"$length"'}'
 434
 435         # Start RD & DHCPv6 service
 436         local router_service
 437         config_get router_service global router_service
 438
 439         if [ "$router_service" == "dnsmasq" ]; then
 440                 local dnsmasq_opts
 441                 config_get dnsmasq_opts "$network" dnsmasq_opts
 442                 [ -z "$dnsmasq_opts" ] && dnsmasq_opts="ra-names,24h"
 443
 444                 local conf="/var/etc/dnsmasq.d/ipv6-router-$network.conf"
 445                 mkdir -p $(dirname $conf)
 446                 echo "dhcp-range=::00ff,::ffff,constructor:$device,$dnsmasq_opts" > $conf
 447                 echo "enable-ra" >> $conf
 448                 /etc/init.d/dnsmasq restart
 449         else
 450                 local pid="/var/run/ipv6-router-$network.pid"
 451                 start_service "/usr/sbin/6relayd -S . $device" "$pid"
 452         fi
 453
 454         # Try relaying if necessary
 455         restart_master_relay "$network"
 456 }
 457
 458
 459 enable_dhcpv6() {
 460         local network="$1"
 461         local device="$2"
 462
 463         # Configure device
 464         conf_set "$device" accept_ra 2
 465         conf_set "$device" forwarding 2
 466
 467         # Trigger RS
 468         conf_set "$device" disable_ipv6 1
 469         conf_set "$device" disable_ipv6 0
 470
 471         # Configure DHCPv6-client
 472         local dhcp6_opts="$device"
 473
 474         # Configure DHCPv6-client (e.g. requested prefix)
 475         local request_prefix
 476         config_get request_prefix "$network" request_prefix
 477         [ -z "$request_prefix" ] && request_prefix="auto"
 478         [ "$request_prefix" != "no" ] && {
 479                 [ "$request_prefix" == "auto" ] && request_prefix=0
 480                 dhcp6_opts="-P$request_prefix $dhcp6_opts"
 481         }
 482
 483         # Start DHCPv6 client
 484         local pid="/var/run/ipv6-dhcpv6-$network.pid"
 485         start_service "/usr/sbin/odhcp6c -s/lib/ipv6/dhcpv6.sh $dhcp6_opts" "$pid"
 486
 487         # Refresh RA on all interfaces
 488         for pid in /var/run/ipv6-router-*.pid; do
 489                 kill -SIGUSR1 $(cat "$pid")
 490         done
 491 }
 492
 493
 494 enable_6to4() {
 495         local network="$1"
 496         local device="$2"
 497         local mode="$3"
 498
 499         local prefixlen="48"
 500         [ "$mode" == "6rd" ] && {
 501                 local ip4prefix=$(uci_get network "$network" ip4prefixlen 0)
 502                 local ip6prefix=$(uci_get network "$network" ip6prefixlen 32)
 503                 prefixlen=$(($ip6prefix + 32 - $ip4prefix))
 504         }
 505
 506         local prefix=""
 507         network_get_ipaddr6 prefix "$network"
 508
 509         announce_prefix "$prefix/$prefixlen" "$network"
 510 }
 511
 512
 513 enable_interface()
 514 {
 515         local network="$1"
 516         local device="$2"
 517         local mode=""
 518
 519         config_get mode "$network" mode
 520         [ -n "$mode" -a "$mode" != "none" ] || return
 521
 522         # Compatibility with old mode names
 523         [ "$mode" == "downstream" ] && mode=router
 524         [ "$mode" == "upstream" ] && mode=dhcpv6
 525
 526         # Run mode startup code
 527         enable_static "$network" "$device"
 528         [ "$mode" == "dhcpv6" ] && enable_dhcpv6 "$network" "$device"
 529         [ "$mode" == "router" ] && enable_router "$network" "$device"
 530         [ "$mode" == "6to4" -o "$mode" == "6rd" ] && enable_6to4 "$network" "$device" "$mode"
 531         [ "$mode" == "relay" ] && restart_master_relay "$network" forced
 532 }