[openwrt/openwrt] umdns: add firewall rule for configured interfaces

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/122b637889c4bd3463e2ca4f07008b067ac19591

commit 122b637889c4bd3463e2ca4f07008b067ac19591
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sat Feb 8 22:27:27 2025 +0100

    umdns: add firewall rule for configured interfaces
    
    Makes it easier to enable MDNS on wan without having to edit the firewall
    configuration for it
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
    (cherry picked from commit 05138fe898ce2d102795bdc979a6d874a3d24424)
---
 package/network/services/umdns/files/umdns.init | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/package/network/services/umdns/files/umdns.init b/package/network/services/umdns/files/umdns.init
index e9a2c05e09..61b2a338d6 100644
--- a/package/network/services/umdns/files/umdns.init
+++ b/package/network/services/umdns/files/umdns.init
@@ -35,6 +35,23 @@ start_service() {
 	procd_set_param command "$PROG"
 	[ -f /etc/seccomp/umdns.json ] && procd_set_param seccomp /etc/seccomp/umdns.json
 	procd_set_param respawn
+
+	procd_open_data
+	json_add_array firewall
+
+	for n in $network; do
+		json_add_object ""
+		json_add_string type rule
+		json_add_string proto udp
+		json_add_string src "$n"
+		json_add_int dest_port 5353
+		json_add_string target ACCEPT
+		json_close_object
+	done
+
+	json_close_array
+	procd_close_data
+
 	procd_open_trigger
 	procd_add_config_trigger "config.change" "umdns" /etc/init.d/umdns reload
 	for n in $network; do