netifd: support DHCP options 138 and 224

Fixes: WIFI-14694
Signed-off-by: Tanya Singh <tanya_singh@accton.com>

feeds/tip/cloud_discovery/files/usr/share/ucentral/cloud_discovery.uc

@@ -5,8 +5,8 @@ import * as fs from 'fs';
 
 let cmd = ARGV[0];
 let ifname = getenv("interface");
-let opt138 = getenv("opt138");
+let opt138 = fs.readfile('/tmp/dhcp-option-138');
-let opt224 = getenv("opt224");
+let opt224 = fs.readfile('/tmp/dhcp-option-224');
 
 if (cmd != 'bound' && cmd != 'renew')
 	exit(0);
@@ -23,14 +23,14 @@ let cloud = {
 	lease: true,
 };
 if (opt138) {
-	let dhcp = hexdec(opt138);
+	let dhcp = opt138;
 	dhcp = split(dhcp, ':');
 	cloud.dhcp_server = dhcp[0];
 	cloud.dhcp_port = dhcp[1] ?? 15002;
 	cloud.no_validation = true;
 }
 if (opt224) {
-	let dhcp = hexdec(opt224);
+	let dhcp = opt224;
 	dhcp = split(dhcp, ':');
 	cloud.dhcp_server = dhcp[0];
 	cloud.dhcp_port = dhcp[1] ?? 15002;

patches/0101-support-dhcp-opt138-opt224.patch

@@ -0,0 +1,68 @@
+From ba5c63cc0cbbacd952a5c2cfd873439bf5adc86a Mon Sep 17 00:00:00 2001
+From: Tanya Singh <tanya_singh@accton.com>
+Date: Thu, 18 Sep 2025 13:21:38 +0800
+Subject: [PATCH] netifd: Support DHCP option 138 and DHCP option 224
+
+---
+ .../netifd/files/lib/netifd/dhcp.script       | 10 ++++++++++
+ .../patches/601-dhcp_opt138_opt224.patch      | 20 +++++++++++++++++++
+ 2 files changed, 30 insertions(+)
+ create mode 100644 package/utils/busybox/patches/601-dhcp_opt138_opt224.patch
+
+diff --git a/package/network/config/netifd/files/lib/netifd/dhcp.script b/package/network/config/netifd/files/lib/netifd/dhcp.script
+index 6fcf139beb..9c4366f48b 100755
+--- a/package/network/config/netifd/files/lib/netifd/dhcp.script
++++ b/package/network/config/netifd/files/lib/netifd/dhcp.script
+@@ -4,6 +4,8 @@
+ . /lib/functions.sh
+ . /lib/netifd/netifd-proto.sh
+ 
++rm -rf /tmp/dhcp-option-*
++
+ set_classless_routes() {
+ 	local max=128
+ 	while [ -n "$1" -a -n "$2" -a $max -gt 0 ]; do
+@@ -111,6 +113,14 @@ case "$1" in
+ 	;;
+ esac
+ 
++if [ -n "${opt138}" ]; then
++	echo -n "${opt138}" > /tmp/dhcp-option-138
++fi
++
++if [ -n "${opt224}" ]; then
++	echo -n "${opt224}" > /tmp/dhcp-option-224
++fi
++
+ # user rules
+ [ -f /etc/udhcpc.user ] && . /etc/udhcpc.user "$@"
+ for f in /etc/udhcpc.user.d/*; do
+diff --git a/package/utils/busybox/patches/601-dhcp_opt138_opt224.patch b/package/utils/busybox/patches/601-dhcp_opt138_opt224.patch
+new file mode 100644
+index 0000000000..38e53be78c
+--- /dev/null
++++ b/package/utils/busybox/patches/601-dhcp_opt138_opt224.patch
+@@ -0,0 +1,20 @@
++--- a/networking/udhcp/common.c	2025-09-18 13:15:38.313248300 +0800
+++++ b/networking/udhcp/common.c	2025-09-18 13:17:50.078418978 +0800
++@@ -55,6 +55,8 @@ const struct dhcp_optflag dhcp_optflags[
++ 	{ OPTION_STRING                           , 0x43 }, /* DHCP_BOOT_FILE     */
++ //TODO: not a string, but a set of LASCII strings:
++ //	{ OPTION_STRING                           , 0x4D }, /* DHCP_USER_CLASS    */
+++	{ OPTION_IP								  , 0x8A }, /* DHCP_OPT138        */
+++	{ OPTION_STRING		          			  , 0xE0 }, /* DHCP_OPT224        */
++ 	{ OPTION_STRING                           , 0x64 }, /* DHCP_PCODE         */
++ 	{ OPTION_STRING                           , 0x65 }, /* DHCP_TCODE         */
++ #if ENABLE_FEATURE_UDHCP_RFC3397
++@@ -124,6 +126,8 @@ const char dhcp_option_strings[] ALIGN1
++ 	"tftp" "\0"             /* DHCP_TFTP_SERVER_NAME*/
++ 	"bootfile" "\0"         /* DHCP_BOOT_FILE       */
++ //	"userclass" "\0"        /* DHCP_USER_CLASS      */
+++	"opt138" "\0"           /* DHCP_OPT138          */
+++	"opt224" "\0"           /* DHCP_OPT224          */
++ 	"tzstr" "\0"            /* DHCP_PCODE           */
++ 	"tzdbstr" "\0"          /* DHCP_TCODE           */
++ #if ENABLE_FEATURE_UDHCP_RFC3397
+-- 
+2.34.1
+