From 80124a050c626584f19fbac917276946224bcde7 Mon Sep 17 00:00:00 2001
From: Roy Marples <roy@marples.name>
Date: Thu, 1 Nov 2007 22:25:53 +0000
Subject: Work cleanly with bridges on kernels without TCP, #197791.

---
 net.Linux/bridge.sh   | 26 +++++++++++++++-----------
 net.Linux/ifconfig.sh |  4 ++++
 net.Linux/iproute2.sh | 12 +++++++++++-
 3 files changed, 30 insertions(+), 12 deletions(-)

(limited to 'net.Linux')

diff --git a/net.Linux/bridge.sh b/net.Linux/bridge.sh
index b1d4cfc..301b1fa 100644
--- a/net.Linux/bridge.sh
+++ b/net.Linux/bridge.sh
@@ -33,7 +33,7 @@ bridge_pre_start() {
 
 	if ! _is_bridge; then
 		ebegin "Creating bridge ${IFACE}"
-		if ! brctl addbr "${IFACE}" ; then
+		if ! brctl addbr "${IFACE}"; then
 			eend 1
 			return 1
 		fi
@@ -50,15 +50,18 @@ bridge_pre_start() {
 	done
 	unset IFS
 
-	if [ -n "${ports}" ] ; then
+	if [ -n "${ports}" ]; then
 		einfo "Adding ports to ${IFACE}"
 		eindent
 
+		local OIFACE="${IFACE}"
 		for x in ${ports}; do
 			ebegin "${x}"
-			ifconfig "${x}" promisc up
-			if ! brctl addif "${IFACE}" "${x}" ; then
-				ifconfig "${x}" -promisc 2>/dev/null
+			local IFACE="${x}"
+			_set_flag promisc
+			_up
+			if ! brctl addif "${OIFACE}" "${x}"; then
+				_set_flag -promisc
 				eend 1
 				return 1
 			fi
@@ -78,7 +81,7 @@ bridge_post_stop() {
 	if _is_bridge ; then
 		ebegin "Destroying bridge ${IFACE}"
 		_down
-		ports="$( brctl show 2>/dev/null | \
+		ports="$(brctl show 2>/dev/null | \
 			sed -n -e '/^'"${IFACE}"'[[:space:]]/,/^\S/ { /^\('"${IFACE}"'[[:space:]]\|\t\)/s/^.*\t//p }')"
 		delete=true
 		iface=${IFACE}
@@ -87,9 +90,9 @@ bridge_post_stop() {
 		# Work out if we're added to a bridge for removal or not
 		eval set -- $(brctl show 2>/dev/null | sed -e "s/'/'\\\\''/g" -e "s/$/'/g" -e "s/^/'/g")
 		local line=
-		for line in "$@" ; do
+		for line in "$@"; do
 			set -- ${line}
-			if [ "$3" = "${IFACE}" ] ; then
+			if [ "$3" = "${IFACE}" ]; then
 				iface=$1
 				break
 			fi
@@ -98,14 +101,15 @@ bridge_post_stop() {
 		extra=" from ${iface}"
 	fi
 
-	for port in ${ports} ; do
+	for port in ${ports}; do
 		ebegin "Removing port ${port}${extra}"
-		ifconfig "${port}" -promisc
+		local IFACE="${port}"
+		_set_flag -promisc
 		brctl delif "${iface}" "${port}"
 		eend $?
 	done
 
-	if ${delete} ; then
+	if ${delete}; then
 		eoutdent
 		brctl delbr "${iface}"
 		eend $?
diff --git a/net.Linux/ifconfig.sh b/net.Linux/ifconfig.sh
index bc04cdb..4051ef5 100644
--- a/net.Linux/ifconfig.sh
+++ b/net.Linux/ifconfig.sh
@@ -42,6 +42,10 @@ _is_wireless() {
 	grep -Eq "^[[:space:]]*${IFACE}:" /proc/net/wireless
 }
 
+_set_flag() {
+	ifconfig "${IFACE}" "$1"
+}
+
 _get_mac_address() {
 	local mac=$(LC_ALL=C ifconfig "${IFACE}" | \
 	sed -n -e 's/.* HWaddr \(..:..:..:..:..:..\).*/\1/p')
diff --git a/net.Linux/iproute2.sh b/net.Linux/iproute2.sh
index e6652c0..8357f25 100644
--- a/net.Linux/iproute2.sh
+++ b/net.Linux/iproute2.sh
@@ -43,6 +43,15 @@ _is_wireless() {
 	grep -Eq "^[[:space:]]*${IFACE}:" /proc/net/wireless
 }
 
+_set_flag() {
+	local flag=$1 opt="on"
+	if [ "${flag#-}" != "${flag}" ]; then
+		flag=${flag#-}
+		opt="off"
+	fi
+	ip link set "${IFACE}" "${flag}" "${opt}"
+}
+
 _get_mac_address() {
 	local mac=$(LC_ALL=C ip link show "${IFACE}" | sed -n \
 		-e 'y/abcdef/ABCDEF/' \
@@ -181,7 +190,8 @@ iproute2_pre_start() {
 }
 
 iproute2_post_start() {
-	ip route flush table cache dev "${IFACE}"
+	# Kernel may not have tcp built in
+	[ -e /proc/net/route ] && ip route flush table cache dev "${IFACE}"
 }
 
 iproute2_post_stop() {
-- 
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