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