Add support for route advertisments for Matter

Fixes #1919

Signed-off-by: Ethan Dye <mrtops03@gmail.com>

functions/openhabian.bash

@@ -390,7 +390,7 @@ system_check_default_password() {
   local originalPassword
   local salt
   local fields
-  
+
   if is_pi && id -u pi &> /dev/null; then
     defaultUser="pi"
     defaultPassword="raspberry"
@@ -414,10 +414,10 @@ system_check_default_password() {
       export algo defaultPassword salt fields
       generatedPassword="$(perl -le 'print crypt("$ENV{defaultPassword}","\$$ENV{algo}\$$ENV{salt}\$")')"
       ;;
-  esac  
+  esac
 
   introText="The default password was detected on your system! That is a serious security concern. Bad guys or malicious programs in your subnet are able to gain root access!\\n\\nPlease set a strong password by typing the command 'passwd ${defaultUser}'!"
-        
+
   echo -n "$(timestamp) [openHABian] Checking for default openHABian username:password combination... "
   if ! [[ $(id -u "$defaultUser") ]]; then echo "OK (unknown user)"; return 0; fi
   if [[ $generatedPassword == "$originalPassword" ]]; then
@@ -439,6 +439,19 @@ system_check_default_password() {
 config_ipv6() {
   local aptConf="/etc/apt/apt.conf.d/S90force-ipv4"
   local sysctlConf="/etc/sysctl.d/99-sysctl.conf"
+  local dhcpcdConf="/etc/dhcpcd.conf"
+
+  echo -n "$(timestamp) [openHABian] Making sure route advertisments are available... "
+  if ! grep -qs "net.ipv6.conf.all.accept_ra = 1" "$sysctlConf"; then
+    echo -e "\\n# Enable IPv6 route advertisments\\n# This is needed for proper discovery with the Matter binding\\nnet.ipv6.conf.all.accept_ra = 1\\nnet.ipv6.conf.all.accept_ra_rt_info_max_plen = 64" >> "$sysctlConf"
+  fi
+  if ! grep -qs "^[[:space:]]*# Disable IPv6" "$dhcpcdConf" && [[ "${1:-${ipv6:-enable}}" == "disable" ]]; then
+    echo -e "\\n# Disable IPv6\\nnoipv6rs\\nnoipv6" >> /etc/dhcpcd.conf
+  elif grep -qs "^[[:space:]]*# Disable IPv6" "$dhcpcdConf" && [[ "${1:-${ipv6:-enable}}" == "enable" ]]; then
+    sed -i '/# Disable IPv6/d; /noipv6rs/d; /noipv6/d' "$dhcpcdConf"
+  fi
+  if ! cond_redirect systemctl restart dhcpcd; then echo "FAILED"; return 1; fi
+  if cond_redirect sysctl --load; then echo "OK"; else echo "FAILED"; return 1; fi
 
   if [[ "${1:-${ipv6:-enable}}" == "disable" ]]; then
     echo -n "$(timestamp) [openHABian] Disabling IPv6... "