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dhcpcd: rework mtu handling on buggy nic's

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some nic's loose the carrier after setting new mtu.

Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
This commit is contained in:
Arne Fitzenreiter
2016-02-01 07:28:03 +01:00
parent 57d98918a1
commit 552fb4b8b5
4 changed files with 35 additions and 9 deletions
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31
config/dhcpc/dhcpcd-hooks/10-mtu Normal file
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@@ -0,0 +1,31 @@
# Configure the MTU for the interface
eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
set_mtu()
{
local mtu=$1
ip link set "$interface" mtu "$mtu"
# test for buggy nic that lose link at mtu set...
carrier=`cat /sys/class/net/$interface/carrier`
if [ "$carrier" == "0" ]; then
syslog info "Warning! Carrier loss after MTU set. Reinit ..."
ip link set "$interface" down
ip link set "$interface" up
fi
}
if [ -n "$new_interface_mtu" ] && $if_up; then
if [ $RED_DHCP_FORCE_MTU -ge 576 ]; then
new_interface_mtu=$RED_DHCP_FORCE_MTU
fi
if [ ! "$new_interface_mtu" == "$ifmtu" ]; then
# The smalled MTU dhcpcd can work with is 576
if [ "$new_interface_mtu" -gt 576 ]; then
if set_mtu "$new_interface_mtu"; then
syslog info "MTU set to $new_interface_mtu"
fi
fi
fi
fi

2
config/rootfiles/core/98/filelists/files
View File

@@ -1,6 +1,7 @@
etc/system-release
etc/issue
etc/rc.d/init.d/firewall
etc/rc.d/init.d/networking/dhcpcd.exe
etc/modprobe.d/nf_conntrack.conf
srv/web/ipfire/cgi-bin/logs.cgi/firewalllog.dat
srv/web/ipfire/cgi-bin/logs.cgi/firewalllogcountry.dat
@@ -16,3 +17,4 @@ srv/web/ipfire/cgi-bin/webaccess.cgi
usr/bin/pgrep
usr/local/bin/qosctrl
usr/local/bin/timectrl
var/ipfire/dhcpc/dhcpcd-hooks/10-mtu

4
lfs/dhcpcd
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@@ -85,9 +85,9 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
rm -f $(CONFIG_ROOT)/dhcpc/dhcpcd-hooks/50-yp.conf
rm -f $(CONFIG_ROOT)/dhcpc/dhcpcd-hooks/50-ypbind
sed -i -e "s|-ge 576|-gt 576|g" $(CONFIG_ROOT)/dhcpc/dhcpcd-hooks/10-mtu
install -m 644 $(DIR_SRC)/config/dhcpc/dhcpcd.conf $(CONFIG_ROOT)/dhcpc/
install -m 444 $(DIR_SRC)/config/dhcpc/dhcpcd-hooks/10-mtu $(CONFIG_ROOT)/dhcpc/dhcpcd-hooks
chown root:root $(CONFIG_ROOT)/dhcpc/dhcpcd.conf
@rm -rf $(DIR_APP)

7
src/initscripts/init.d/networking/dhcpcd.exe
View File

@@ -31,13 +31,6 @@ dhcpcd_up()
# Only if RED_TYPE=DHCP update /var/ipfire/red
if [ "$RED_TYPE" == "DHCP" ]; then
#Force MTU option for KabelDeutschland because this ISP
#set the MTU to 576 instead of the supportet 1500
if [ $RED_DHCP_FORCE_MTU -ge 576 ]; then
logger -p local0.info -t dhcpcd.exe[$$] "Force mtu to $RED_DHCP_FORCE_MTU"
ip link set $interface mtu $RED_DHCP_FORCE_MTU
fi
#Check if we have to restart the services at update
[ ! -e "/var/ipfire/red/active" ] && update=1;
if [ "$old_domain_name_service" != "$new_domain_name_service" ]; then