62744efa47
The udhcpc script calls ip addr flush .. which flushes addresses of any address family, including IPv6. However, busybox udhcpc is IPv4 only and should not influence IPv6 addressing. Hence use ip addr flush with family constraint. The script particularly broke IPv6 SLAAC: Typically when udhcpc calls the script the kernel already assigned the IPv6 link-local address. The flush removes the link-local IPv6 address again and prohibits proper IPv6 operation such as SLAAC since neighbor discovery protocol relies on IPv6 link-local addressing. Signed-off-by: Stefan Agner <stefan.agner@toradex.com> [Taken from https://git.openembedded.org/openembedded-core/commit/meta/recipes-core/busybox/files/simple.script?id=b77541dbb2f442e51842f9d24c8745a6df2d1478] Signed-off-by: Quentin Schulz <quentin.schulz@streamunlimited.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
76 lines
2.0 KiB
Bash
Executable File
76 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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# udhcpc script edited by Tim Riker <Tim@Rikers.org>
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RESOLV_CONF="/etc/resolv.conf"
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[ -n "$1" ] || { echo "Error: should be called from udhcpc"; exit 1; }
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NETMASK=""
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if command -v ip >/dev/null; then
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[ -n "$subnet" ] && NETMASK="/$subnet"
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else
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[ -n "$subnet" ] && NETMASK="netmask $subnet"
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fi
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BROADCAST="broadcast +"
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[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
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case "$1" in
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deconfig)
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echo "Clearing IP addresses on $interface, upping it"
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if command -v ip >/dev/null; then
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ip -4 addr flush dev $interface
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ip link set dev $interface up
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else
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ifconfig $interface 0.0.0.0
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fi
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;;
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renew|bound)
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echo "Setting IP address $ip on $interface"
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if command -v ip >/dev/null; then
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ip addr add $ip$NETMASK $BROADCAST dev $interface
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else
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ifconfig $interface $ip $NETMASK $BROADCAST
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fi
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if [ -n "$router" ] ; then
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echo "Deleting routers"
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while route del default gw 0.0.0.0 dev $interface ; do
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:
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done
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metric=0
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for i in $router ; do
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echo "Adding router $i"
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if [ "$subnet" = "255.255.255.255" ]; then
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# special case for /32 subnets:
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# /32 instructs kernel to always use routing for all outgoing packets
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# (they can never be sent to local subnet - there is no local subnet for /32).
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# Used in datacenters, avoids the need for private ip-addresses between two hops.
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ip route add $i dev $interface
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fi
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route add default gw $i dev $interface metric $((metric++))
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done
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fi
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# If the file is a symlink somewhere (like /etc/resolv.conf
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# pointing to /run/resolv.conf), make sure things work.
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if test -L "$RESOLV_CONF"; then
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# If it's a dangling symlink, try to create the target.
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test -e "$RESOLV_CONF" || touch "$RESOLV_CONF"
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fi
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realconf=$(readlink -f "$RESOLV_CONF" 2>/dev/null || echo "$RESOLV_CONF")
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echo "Recreating $realconf"
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tmpfile="$realconf-$$"
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> "$tmpfile"
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[ -n "$domain" ] && echo "search $domain" >> "$tmpfile"
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for i in $dns ; do
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echo " Adding DNS server $i"
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echo "nameserver $i" >> "$tmpfile"
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done
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mv "$tmpfile" "$realconf"
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;;
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esac
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exit 0
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