In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 3:

. /lib/functions.sh

  ^---------------^ SC1091 (info): Not following: /lib/functions.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 4:

. ../netifd-proto.sh

  ^----------------^ SC1091 (info): Not following: ../netifd-proto.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 8:

	renew_handler=1

        ^-----------^ SC2034 (warning): renew_handler appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 53:

	local config="$1"

        ^----------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 54:

	local iface="$2"

        ^---------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 56:

	local reqaddress reqprefix clientid reqopts defaultreqopts noslaaconly forceprefix extendprefix norelease noserverunicast noclientfqdn noacceptreconfig ip6prefix ip6prefixes iface_dslite iface_map iface_464xlat ifaceid userclass vendorclass sendopts delegate zone_dslite zone_map zone_464xlat zone encaplimit_dslite encaplimit_map soltimeout fakeroutes sourcefilter keep_ra_dnslifetime ra_holdoff

        ^-- SC3043 (warning): In POSIX sh, 'local' is undefined.

                                                                                                                                                                ^-------^ SC2034 (warning): ip6prefix appears unused. Verify use (or export if used externally).

                                                                                                                                                                                                                                                         ^------^ SC2034 (warning): sendopts appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 61:

	local opts=""

        ^--------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 64:

	[ -z "$reqprefix" -o "$reqprefix" = "auto" ] && reqprefix=0

                          ^-- SC2166 (warning): Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 93:

	local opt

        ^-------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 121:

		$opts $iface

                ^---^ SC2086 (info): Double quote to prevent globbing and word splitting.

                      ^----^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

		"$opts" "$iface"

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 125:

	local interface="$1"

        ^-------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 127:

	local sigusr1="$(kill -l SIGUSR1)"

        ^-----------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

              ^-----^ SC2155 (warning): Declare and assign separately to avoid masking return values.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 128:

	[ -n "$sigusr1" ] && proto_kill_command "$interface" $sigusr1

                                                             ^------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

	[ -n "$sigusr1" ] && proto_kill_command "$interface" "$sigusr1"

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/netifd/proto/dhcpv6.sh line 132:

	local interface="$1"

        ^-------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

For more information:

  https://www.shellcheck.net/wiki/SC2034 -- ip6prefix appears unused. Verify ...

  https://www.shellcheck.net/wiki/SC2155 -- Declare and assign separately to ...

  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] || [ q ] as [ p -o q...