In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 3:
. /lib/rcscripts/sh/error.sh
  ^------------------------^ SC1091 (info): Not following: /lib/rcscripts/sh/error.sh was not specified as input (see shellcheck -x).


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 4:
. /lib/rcscripts/sh/rc-std2parse.sh
  ^-- SC1091 (info): Not following: /lib/rcscripts/sh/rc-std2parse.sh was not specified as input (see shellcheck -x).


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 5:
. /etc/conf.d/mcast-redir
  ^---------------------^ SC1091 (info): Not following: /etc/conf.d/mcast-redir was not specified as input (see shellcheck -x).


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 8:
self=${0##*/}
^--^ SC2034 (warning): self appears unused. Verify use (or export if used externally).


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 13:
	local output_if vlan_id
        ^---------------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 41:
	ip -o link show $output_if 2>/dev/null |
                        ^--------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
	ip -o link show "$output_if" 2>/dev/null |


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 50:
		ip link show dev $REDIR_IF >/dev/null 2>&1 ||
                                 ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
		ip link show dev "$REDIR_IF" >/dev/null 2>&1 ||


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 51:
			vconfig add $output_if $vlan_id || {
                                    ^--------^ SC2086 (info): Double quote to prevent globbing and word splitting.
                                               ^------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
			vconfig add "$output_if" "$vlan_id" || {


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 57:
		ip -o link show dev $REDIR_IF 2>/dev/null |
                                    ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
		ip -o link show dev "$REDIR_IF" 2>/dev/null |


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 58:
			grep -q '^[0-9]\+:[[:blank:]]\+$REDIR_IF:.*,UP.*' ||
                                ^-- SC2016 (info): Expressions don't expand in single quotes, use double quotes for that.


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 59:
			ip link set up dev $REDIR_IF || {
                                           ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
			ip link set up dev "$REDIR_IF" || {


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 65:
	ip route add default dev $REDIR_IF table 220
                                 ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
	ip route add default dev "$REDIR_IF" table 220


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 66:
	ip rule add fwmark $REDIR_MARKER table 220
                           ^-----------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
	ip rule add fwmark "$REDIR_MARKER" table 220


In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-redir-setup line 74:
	vconfig rem $REDIR_IF 2>/dev/null || :
                    ^-------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
	vconfig rem "$REDIR_IF" 2>/dev/null || :

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- self appears unused. Verify use (...
  https://www.shellcheck.net/wiki/SC3043 -- In POSIX sh, 'local' is undefined.
  https://www.shellcheck.net/wiki/SC1091 -- Not following: /etc/conf.d/mcast-...