e1c5111997
Make the IPv4 "do not fragment" bit a configurable variable for the 6rd tunnel interface as the bit should not be set in the encapsulating IPv4 header according to RFC3056. On top the config variable allows to enable/disable path mtu discovery for tunnel interfaces. Config variable can be passed to netifd as tunnel config support is already present for the "do not fragment" bit. Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> SVN-Revision: 39370
96 lines
2.5 KiB
Bash
96 lines
2.5 KiB
Bash
#!/bin/sh
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# 6rd.sh - IPv6-in-IPv4 tunnel backend
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# Copyright (c) 2010-2012 OpenWrt.org
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[ -n "$INCLUDE_ONLY" ] || {
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. /lib/functions.sh
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. /lib/functions/network.sh
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. ../netifd-proto.sh
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init_proto "$@"
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}
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proto_6rd_setup() {
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local cfg="$1"
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local iface="$2"
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local link="6rd-$cfg"
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local mtu df ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen tunlink sourcerouting
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json_get_vars mtu df ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen tunlink sourcerouting
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[ -z "$ip6prefix" -o -z "$peeraddr" ] && {
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proto_notify_error "$cfg" "MISSING_ADDRESS"
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proto_block_restart "$cfg"
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return
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}
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( proto_add_host_dependency "$cfg" 0.0.0.0 )
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[ -z "$ipaddr" ] && {
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local wanif
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if ! network_find_wan wanif || ! network_get_ipaddr ipaddr "$wanif"; then
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proto_notify_error "$cfg" "NO_WAN_LINK"
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return
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fi
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}
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# Determine the relay prefix.
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local ip4prefixlen="${ip4prefixlen:-0}"
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local ip4prefix=$(ipcalc.sh "$ipaddr/$ip4prefixlen" | grep NETWORK)
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ip4prefix="${ip4prefix#NETWORK=}"
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# Determine our IPv6 address.
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local ip6subnet=$(6rdcalc "$ip6prefix/$ip6prefixlen" "$ipaddr/$ip4prefixlen")
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local ip6addr="${ip6subnet%%::*}::1"
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# Determine the IPv6 prefix
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local ip6lanprefix="$ip6subnet/$(($ip6prefixlen + 32 - $ip4prefixlen))"
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proto_init_update "$link" 1
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proto_add_ipv6_address "$ip6addr" "$ip6prefixlen"
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proto_add_ipv6_prefix "$ip6lanprefix"
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if [ "$sourcerouting" != "0" ]; then
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proto_add_ipv6_route "::" 0 "::$peeraddr" 4096 "" "::/128"
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proto_add_ipv6_route "::" 0 "::$peeraddr" 4096 "" "$ip6addr/$ip6prefixlen"
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proto_add_ipv6_route "::" 0 "::$peeraddr" 4096 "" "$ip6lanprefix"
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else
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proto_add_ipv6_route "::" 0 "::$peeraddr" 4096
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fi
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proto_add_tunnel
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json_add_string mode sit
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json_add_int mtu "${mtu:-1280}"
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json_add_boolean df "${df:-1}"
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json_add_int ttl "${ttl:-64}"
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json_add_string local "$ipaddr"
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json_add_string 6rd-prefix "$ip6prefix/$ip6prefixlen"
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json_add_string 6rd-relay-prefix "$ip4prefix/$ip4prefixlen"
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[ -n "$tunlink" ] && json_add_string link "$tunlink"
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proto_close_tunnel
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proto_send_update "$cfg"
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}
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proto_6rd_teardown() {
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local cfg="$1"
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}
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proto_6rd_init_config() {
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no_device=1
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available=1
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proto_config_add_int "mtu"
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proto_config_add_boolean "df"
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proto_config_add_int "ttl"
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proto_config_add_string "ipaddr"
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proto_config_add_string "peeraddr"
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proto_config_add_string "ip6prefix"
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proto_config_add_string "ip6prefixlen"
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proto_config_add_string "ip4prefixlen"
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proto_config_add_string "tunlink"
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proto_config_add_boolean "sourcerouting"
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}
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[ -n "$INCLUDE_ONLY" ] || {
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add_protocol 6rd
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}
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