lldpd: fix reload bug: advertisements shall default to on

Because these capability advertisements default to on in lldpd, they
became absent at reload, and not restart, due to how the reload logic
works ( keep daemon running, send unconfigured and then the new config
via socket ), and it was not evident unless you happened to be looking
for it (e.g. via pcap or tcpdump). It was also not evident from the
manpage ( have now sent patches upstream ).

At reload time, the unconfigure logic disabled them unless they were
explicitly enabled (compare with other settings where 'unconfigure' just
resets them). Now they default to on/enabled at init time, and are
explicitly 'unconfigure'd at startup if the user disables them via:

lldp_mgmt_addr_advertisements=0
lldp_capability_advertisements=0

In other words: explicit is necessary to disable the advertisements.

The same applies to 'configure system capabilities enabled'. Technically
'unconfigure'd is the default but now it is explicit at reload.

Tested on: 23.05.3

Signed-off-by: Paul Donald <newtwen+github@gmail.com>
(cherry picked from commit 708101c)
Link: openwrt#15299
Signed-off-by: Robert Marko <robimarko@gmail.com>

package/network/services/lldpd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=lldpd
 PKG_VERSION:=1.0.17
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/lldpd/lldpd/releases/download/$(PKG_VERSION)/

package/network/services/lldpd/files/lldpd.init

@@ -114,17 +114,17 @@ write_lldpd_conf()
 	local lldp_mgmt_ip
 	config_get lldp_mgmt_ip 'config' 'lldp_mgmt_ip'
 
-	# Configurable capabilities in lldpd >= v1.0.15
+	# Configurable capabilities in lldpd >= v1.0.15: defaults to 'unconfigured' i.e. kernel info
 	local lldp_syscapabilities
 	config_get lldp_syscapabilities 'config' 'lldp_syscapabilities'
 
-	# Configurable capabilities in lldpd >= v1.0.15
+	# Configurable capabilities in lldpd >= v1.0.15: defaults to on in lldpd
 	local lldp_capability_advertisements
-	config_get_bool lldp_capability_advertisements 'config' 'lldp_capability_advertisements' 0
+	config_get_bool lldp_capability_advertisements 'config' 'lldp_capability_advertisements' 1
 
-	# Broadcast management address in lldpd >= 0.7.15
+	# Broadcast management address in lldpd >= 0.7.15: defaults to on in lldpd
 	local lldp_mgmt_addr_advertisements
-	config_get_bool lldp_mgmt_addr_advertisements 'config' 'lldp_mgmt_addr_advertisements' 0
+	config_get_bool lldp_mgmt_addr_advertisements 'config' 'lldp_mgmt_addr_advertisements' 1
 
 	if [ "$CONFIG_LLDPD_WITH_LLDPMED" = "y" ]; then
 		local lldpmed_fast_start
@@ -192,8 +192,10 @@ write_lldpd_conf()
 	[ -n "$lldp_platform" ] && echo "configure system platform" "\"$lldp_platform\"" >> "$LLDPD_CONF"
 	[ -n "$lldp_tx_interval" ] && echo "configure lldp tx-interval $lldp_tx_interval" >> "$LLDPD_CONF"
 	[ "$lldp_tx_hold" -gt 0 ] && echo "configure lldp tx-hold $lldp_tx_hold" >> "$LLDPD_CONF"
-	[ "$lldp_capability_advertisements" -gt 0 ] && echo "configure lldp capabilities-advertisements" >> "$LLDPD_CONF"
-	[ "$lldp_mgmt_addr_advertisements" -gt 0 ] && echo "configure lldp management-addresses-advertisements" >> "$LLDPD_CONF"
+	[ "$lldp_capability_advertisements" -gt 0 ] && echo "configure lldp capabilities-advertisements" >> "$LLDPD_CONF" ||\
+		echo "unconfigure lldp capabilities-advertisements" >> "$LLDPD_CONF"
+	[ "$lldp_mgmt_addr_advertisements" -gt 0 ] && echo "configure lldp management-addresses-advertisements" >> "$LLDPD_CONF" ||\
+		echo "unconfigure lldp management-addresses-advertisements" >> "$LLDPD_CONF"
 
 	# Since lldpd's sysconfdir is /tmp, we'll symlink /etc/lldpd.d to /tmp/$LLDPD_CONFS_DIR
 	[ -e "$LLDPD_CONFS_DIR" ] || ln -s /etc/lldpd.d "$LLDPD_CONFS_DIR"
@@ -374,6 +376,8 @@ reload_service() {
 		unconfigure lldp custom-tlv
 		unconfigure lldp capabilities-advertisements
 		unconfigure lldp management-addresses-advertisements
+		# unconfigures user-configured system capabilities, and instead uses the kernel information:
+		unconfigure system capabilities enabled
 		unconfigure system interface pattern
 		unconfigure system description
 		unconfigure system hostname