selftests: Add IPv6 link-local address generation tests for GRE devices.

TEST_PROGS += ioam6.sh

TEST_PROGS += gro.sh

TEST_PROGS += gre_gso.sh

TEST_PROGS += gre_ipv6_lladdr.sh

TEST_PROGS += cmsg_so_mark.sh

TEST_PROGS += cmsg_so_priority.sh

TEST_PROGS += test_so_rcv.sh

#!/bin/bash

# SPDX-License-Identifier: GPL-2.0

source ./lib.sh

PAUSE_ON_FAIL="no"

# The trap function handler

#

exit_cleanup_all()

{

	cleanup_all_ns

	exit "${EXIT_STATUS}"

}

# Add fake IPv4 and IPv6 networks on the loopback device, to be used as

# underlay by future GRE devices.

#

setup_basenet()

{

	ip -netns "${NS0}" link set dev lo up

	ip -netns "${NS0}" address add dev lo 192.0.2.10/24

	ip -netns "${NS0}" address add dev lo 2001:db8::10/64 nodad

}

# Check if network device has an IPv6 link-local address assigned.

#

# Parameters:

#

#   * $1: The network device to test

#   * $2: An extra regular expression that should be matched (to verify the

#         presence of extra attributes)

#   * $3: The expected return code from grep (to allow checking the absence of

#         a link-local address)

#   * $4: The user visible name for the scenario being tested

#

check_ipv6_ll_addr()

{

	local DEV="$1"

	local EXTRA_MATCH="$2"

	local XRET="$3"

	local MSG="$4"

	RET=0

	set +e

	ip -netns "${NS0}" -6 address show dev "${DEV}" scope link | grep "fe80::" | grep -q "${EXTRA_MATCH}"

	check_err_fail "${XRET}" $? ""

	log_test "${MSG}"

	set -e

}

# Create a GRE device and verify that it gets an IPv6 link-local address as

# expected.

#

# Parameters:

#

#   * $1: The device type (gre, ip6gre, gretap or ip6gretap)

#   * $2: The local underlay IP address (can be an IPv4, an IPv6 or "any")

#   * $3: The remote underlay IP address (can be an IPv4, an IPv6 or "any")

#   * $4: The IPv6 interface identifier generation mode to use for the GRE

#         device (eui64, none, stable-privacy or random).

#

test_gre_device()

{

	local GRE_TYPE="$1"

	local LOCAL_IP="$2"

	local REMOTE_IP="$3"

	local MODE="$4"

	local ADDR_GEN_MODE

	local MATCH_REGEXP

	local MSG

	ip link add netns "${NS0}" name gretest type "${GRE_TYPE}" local "${LOCAL_IP}" remote "${REMOTE_IP}"

	case "${MODE}" in

	    "eui64")

		ADDR_GEN_MODE=0

		MATCH_REGEXP=""

		MSG="${GRE_TYPE}, mode: 0 (EUI64), ${LOCAL_IP} -> ${REMOTE_IP}"

		XRET=0

		;;

	    "none")

		ADDR_GEN_MODE=1

		MATCH_REGEXP=""

		MSG="${GRE_TYPE}, mode: 1 (none), ${LOCAL_IP} -> ${REMOTE_IP}"

		XRET=1 # No link-local address should be generated

		;;

	    "stable-privacy")

		ADDR_GEN_MODE=2

		MATCH_REGEXP="stable-privacy"

		MSG="${GRE_TYPE}, mode: 2 (stable privacy), ${LOCAL_IP} -> ${REMOTE_IP}"

		XRET=0

		# Initialise stable_secret (required for stable-privacy mode)

		ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.stable_secret="2001:db8::abcd"

		;;

	    "random")

		ADDR_GEN_MODE=3

		MATCH_REGEXP="stable-privacy"

		MSG="${GRE_TYPE}, mode: 3 (random), ${LOCAL_IP} -> ${REMOTE_IP}"

		XRET=0

		;;

	esac

	# Check that IPv6 link-local address is generated when device goes up

	ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode="${ADDR_GEN_MODE}"

	ip -netns "${NS0}" link set dev gretest up

	check_ipv6_ll_addr gretest "${MATCH_REGEXP}" "${XRET}" "config: ${MSG}"

	# Now disable link-local address generation

	ip -netns "${NS0}" link set dev gretest down

	ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode=1

	ip -netns "${NS0}" link set dev gretest up

	# Check that link-local address generation works when re-enabled while

	# the device is already up

	ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode="${ADDR_GEN_MODE}"

	check_ipv6_ll_addr gretest "${MATCH_REGEXP}" "${XRET}" "update: ${MSG}"

	ip -netns "${NS0}" link del dev gretest

}

test_gre4()

{

	local GRE_TYPE

	local MODE

	for GRE_TYPE in "gre" "gretap"; do

		printf "\n####\nTesting IPv6 link-local address generation on ${GRE_TYPE} devices\n####\n\n"

		for MODE in "eui64" "none" "stable-privacy" "random"; do

			test_gre_device "${GRE_TYPE}" 192.0.2.10 192.0.2.11 "${MODE}"

			test_gre_device "${GRE_TYPE}" any 192.0.2.11 "${MODE}"

			test_gre_device "${GRE_TYPE}" 192.0.2.10 any "${MODE}"

		done

	done

}

test_gre6()

{

	local GRE_TYPE

	local MODE

	for GRE_TYPE in "ip6gre" "ip6gretap"; do

		printf "\n####\nTesting IPv6 link-local address generation on ${GRE_TYPE} devices\n####\n\n"

		for MODE in "eui64" "none" "stable-privacy" "random"; do

			test_gre_device "${GRE_TYPE}" 2001:db8::10 2001:db8::11 "${MODE}"

			test_gre_device "${GRE_TYPE}" any 2001:db8::11 "${MODE}"

			test_gre_device "${GRE_TYPE}" 2001:db8::10 any "${MODE}"

		done

	done

}

usage()

{

	echo "Usage: $0 [-p]"

	exit 1

}

while getopts :p o

do

	case $o in

		p) PAUSE_ON_FAIL="yes";;

		*) usage;;

	esac

done

setup_ns NS0

set -e

trap exit_cleanup_all EXIT

setup_basenet

test_gre4

test_gre6