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netifd: use the global DHCP DUID for DHCPv4

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This makes the DHCPv4 client use the global DHCP DUID to generate a
RFC4361-style client identifier.

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/openwrt/pull/20359
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
David Härdeman 2025-10-10 11:38:36 +02:00 • committed by Robert Marko
parent a660a076db
commit 9151c7015e
1 changed files with 14 additions and 0 deletions
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14
package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
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@ -4,6 +4,7 @@
. /lib/functions.sh
. ../netifd-proto.sh
. /lib/config/uci.sh
init_proto "$@"
proto_dhcp_init_config() {
@ -31,6 +32,18 @@ proto_dhcp_add_sendopts() {
[ -n "$1" ] && append "$3" "-x $1"
}
proto_dhcp_get_default_clientid() {
[ -z "$1" ] && return
local iface="$1"
local duid
local iaid="0"
[ -e "/sys/class/net/$iface/ifindex" ] && iaid="$(cat "/sys/class/net/$iface/ifindex")"
duid="$(uci_get network @globals[0] dhcp_default_duid)"
[ -n "$duid" ] && printf "ff%08x%s" "$iaid" "$duid"
}
proto_dhcp_setup() {
local config="$1"
local iface="$2"
@ -51,6 +64,7 @@ proto_dhcp_setup() {
[ "$defaultreqopts" = 0 ] && defaultreqopts="-o" || defaultreqopts=
[ "$broadcast" = 1 ] && broadcast="-B" || broadcast=
[ "$norelease" = 1 ] && norelease="" || norelease="-R"
[ -z "$clientid" ] && clientid="$(proto_dhcp_get_default_clientid "$iface")"
[ -n "$clientid" ] && clientid="-x 0x3d:${clientid//:/}"
[ -n "$iface6rd" ] && proto_export "IFACE6RD=$iface6rd"
[ "$iface6rd" != 0 -a -f /lib/netifd/proto/6rd.sh ] && append dhcpopts "-O 212"