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