From patchwork Fri Nov 3 08:18:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [v2] fff-network/fff-hoods: Create functions for IPv6 rewriting From: Adrian Schmutzler X-Patchwork-Id: 652 Message-Id: <1509697081-1911-1-git-send-email-freifunk@adrianschmutzler.de> To: franken-dev@freifunk.net Date: Fri, 3 Nov 2017 09:18:01 +0100 This puts the code for creating IPv6 addresses from MAC address and EUI into functions, so it can be reused. This should be particularly helpful if code is rewritten later. Signed-off-by: Adrian Schmutzler Tested-by: Adrian Schmutzler Reviewed-by: Tim Niemeyer --- Changes in v2: - Added comments to functions .../fff/fff-hoods/files/usr/sbin/configurehood | 11 ++- .../fff-network/files/lib/functions/fff/network | 87 ++++++++++++++++++++++ .../fff-network/files/usr/sbin/configurenetwork | 11 ++- 3 files changed, 97 insertions(+), 12 deletions(-) create mode 100644 src/packages/fff/fff-network/files/lib/functions/fff/network diff --git a/src/packages/fff/fff-hoods/files/usr/sbin/configurehood b/src/packages/fff/fff-hoods/files/usr/sbin/configurehood index 3d0afc3..f785b7d 100755 --- a/src/packages/fff/fff-hoods/files/usr/sbin/configurehood +++ b/src/packages/fff/fff-hoods/files/usr/sbin/configurehood @@ -2,6 +2,7 @@ . /usr/share/libubox/jshn.sh . /lib/functions/fff/keyxchange +. /lib/functions/fff/network . /lib/functions/fff/wireless . /lib/functions/fff/timeserver @@ -242,12 +243,10 @@ if [ -s "$hoodfile" ]; then # Set $prefix::MAC as IP if [ -n "$prefix" ] ; then prefix="$(echo "$prefix" | sed -e 's,\\,,')" - suffix="$(awk -F: '{ print "0:"$1$2":"$3$4":"$5$6 }' /sys/class/net/br-mesh/address)" - suffix_eui="$(awk -F: '{ printf("%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }' /sys/class/net/br-mesh/address)" - addr="$(echo "$prefix" | sed -e 's,/,'$suffix'/,')" - echo $addr | grep -q "::" || addr="$(echo "$addr" | sed -e 's,:[0:]*:,::,')" - addr_eui="$(echo "$prefix" | sed -e 's,/,'$suffix_eui'/,')" - echo $addr_eui | grep -q "::" || addr_eui="$(echo "$addr_eui" | sed -e 's,:[0:]*:,::,')" + addr="$(ipMacAssemble "$prefix" "br-mesh")" + addr="$(ipTidyColon "$addr")" + addr_eui="$(ipEUIAssemble "$prefix" "br-mesh")" + addr_eui="$(ipTidyColon "$addr_eui")" for ip in $(ip -6 addr show dev br-mesh | grep inet6 | grep -v -e " $addr" -e " $addr_eui" -e " fe80::" -e " fdff::" | cut -f6 -d " "); do ip -6 addr del "$ip" dev br-mesh done diff --git a/src/packages/fff/fff-network/files/lib/functions/fff/network b/src/packages/fff/fff-network/files/lib/functions/fff/network new file mode 100644 index 0000000..8dd9f77 --- /dev/null +++ b/src/packages/fff/fff-network/files/lib/functions/fff/network @@ -0,0 +1,87 @@ +#!/bin/sh +# Copyright 2017 Adrian Schmutzler +# License GPLv3 + +ipMacSuffix() { + # Returns the lower 64 bits of an IPv6 address (0:aabb:ccdd:eeff) + # based on the mac address (aa:bb:cc:bb:ee:ff) of a specified interface + # + # Argument: name of interface (e.g. br-mesh) + + [ $# -ne "1" ] && return 1 + + local iface=$1 + + awk -F: '{ print "0:"$1$2":"$3$4":"$5$6 }' "/sys/class/net/${iface}/address" + return 0 +} + +ipEUISuffix() { + # Returns the EUI (interface ID, a8bb:ccff:fedd:eeff) + # based on the mac address (aa:bb:cc:bb:ee:ff) of a specified interface + # + # Argument: name of interface (e.g. br-mesh) + + [ $# -ne "1" ] && return 1 + + local iface=$1 + + awk -F: '{ printf("%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }' "/sys/class/net/${iface}/address" + return 0 +} + +ipAssemble() { + # Concatenates a prefix (1st argument) and a suffix (2nd argument) to a merged IPv6 address + # (The prefix has to bear the subnet: fdff::/64) + # (The prefix must only contain the higher 64 bits (correct: 0:0:0:0: or 0:: - wrong: 0:0:0:0::) + + [ $# -ne "2" ] && return 1 + + local prefix=$1 + local suffix=$2 + + echo "$prefix" | sed -e 's,/,'$suffix'/,' + return 0 +} + +ipMacAssemble() { + # Concatenates a prefix (1st argument) and a MAC-based suffix (interface as 2nd argument) to a merged IPv6 address + # (Details on prefix: Check ipAssemble(), details on suffix: Check ipMacSuffix()) + + [ $# -ne "2" ] && return 1 + + local prefix=$1 + local iface=$2 + + suffix="$(ipMacSuffix "$iface")" + ipAssemble "$prefix" "$suffix" + return 0 +} + +ipEUIAssemble() { + # Concatenates a prefix (1st argument) and an EUI-based suffix (interface as 2nd argument) to a merged IPv6 address + # (Details on prefix: Check ipAssemble(), details on suffix: Check ipEUISuffix()) + + [ $# -ne "2" ] && return 1 + + local prefix=$1 + local iface=$2 + + suffix="$(ipEUISuffix "$iface")" + ipAssemble "$prefix" "$suffix" + return 0 +} + +ipTidyColon() { + # Collapses zeros to :: to yield short but valid IPv6 addresses + # + # Argument: IPv6 address to be shortened + + [ $# -ne "1" ] && return 1 + + local addr=$1 + + echo "$addr" | grep -q "::" || addr="$(echo "$addr" | sed -e 's,:[0:]*:,::,')" + echo "$addr" + return 0 +} diff --git a/src/packages/fff/fff-network/files/usr/sbin/configurenetwork b/src/packages/fff/fff-network/files/usr/sbin/configurenetwork index c6b3113..d4866e4 100755 --- a/src/packages/fff/fff-network/files/usr/sbin/configurenetwork +++ b/src/packages/fff/fff-network/files/usr/sbin/configurenetwork @@ -9,6 +9,8 @@ # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. +. /lib/functions/fff/network + BOARD="$(uci get board.model.name)" . /etc/network.$BOARD @@ -218,8 +220,7 @@ else prefix="fdff:0::/64" # Set $prefix::MAC as IP - suffix=$(awk -F: '{ print $1$2":"$3$4":"$5$6 }' /sys/class/net/br-mesh/address) - addr=$(echo $prefix | sed -e 's/\//'$suffix'\//') + addr="$(ipMacAssemble "$prefix" "br-mesh")" ip -6 addr add $addr dev br-mesh uci -q del network.globals @@ -229,14 +230,12 @@ else uci -q set network.mesh.proto=static # Set $prefix::1 as IP - suffix="1" - addr=$(echo $prefix | sed -e 's/\//'$suffix'\//') + addr="$(ipAssemble "$prefix" "1")" ip -6 addr add $addr dev br-mesh uci -q add_list network.mesh.ip6addr=$addr # Set $prefix::link-local as IP - suffix=$(awk -F: '{ printf("%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }' /sys/class/net/br-mesh/address) - addr=$(echo $prefix | sed -e 's/\//'$suffix'\//') + addr="$(ipEUIAssemble "$prefix" "br-mesh")" ip -6 addr add $addr dev br-mesh uci -q add_list network.mesh.ip6addr=$addr