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vrf: packets with lladdr src needs dst at input with orig_iif when needs strict

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Depending on the order of the routes to fe80::/64 are installed on the
VRF table, the NS for the source link-local address of the originator
might be sent to the wrong interface.

This patch ensures that packets with link-local addr source is doing a
lookup with the orig_iif when the destination addr indicates that it
is strict.

Add the reproducer as a use case in self test script fcnal-test.sh.

Fixes: b4869aa2f8 ("net: vrf: ipv6 support for local traffic to local addresses")
Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20201204030604.18828-1-ssuryaextr@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stephen Suryaputra 2020-12-03 22:06:04 -05:00 committed by Jakub Kicinski
parent 4d1be581ec
commit 205704c618
2 changed files with 103 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/vrf.c
View File

@ -1315,11 +1315,17 @@ static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
int orig_iif = skb->skb_iif;
bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
bool is_ndisc = ipv6_ndisc_frame(skb);
bool is_ll_src;
/* loopback, multicast & non-ND link-local traffic; do not push through
* packet taps again. Reset pkt_type for upper layers to process skb
* packet taps again. Reset pkt_type for upper layers to process skb.
* for packets with lladdr src, however, skip so that the dst can be
* determine at input using original ifindex in the case that daddr
* needs strict
*/
if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
is_ll_src = ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL;
if (skb->pkt_type == PACKET_LOOPBACK ||
(need_strict && !is_ndisc && !is_ll_src)) {
skb->dev = vrf_dev;
skb->skb_iif = vrf_dev->ifindex;
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;

95
tools/testing/selftests/net/fcnal-test.sh
View File

@ -256,6 +256,28 @@ setup_cmd_nsb()
fi
}
setup_cmd_nsc()
{
local cmd="$*"
local rc
run_cmd_nsc ${cmd}
rc=$?
if [ $rc -ne 0 ]; then
# show user the command if not done so already
if [ "$VERBOSE" = "0" ]; then
echo "setup command: $cmd"
fi
echo "failed. stopping tests"
if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
echo
echo "hit enter to continue"
read a
fi
exit $rc
fi
}
# set sysctl values in NS-A
set_sysctl()
{
@ -471,6 +493,36 @@ setup()
sleep 1
}
setup_lla_only()
{
# make sure we are starting with a clean slate
kill_procs
cleanup 2>/dev/null
log_debug "Configuring network namespaces"
set -e
create_ns ${NSA} "-" "-"
create_ns ${NSB} "-" "-"
create_ns ${NSC} "-" "-"
connect_ns ${NSA} ${NSA_DEV} "-" "-" \
${NSB} ${NSB_DEV} "-" "-"
connect_ns ${NSA} ${NSA_DEV2} "-" "-" \
${NSC} ${NSC_DEV} "-" "-"
NSA_LINKIP6=$(get_linklocal ${NSA} ${NSA_DEV})
NSB_LINKIP6=$(get_linklocal ${NSB} ${NSB_DEV})
NSC_LINKIP6=$(get_linklocal ${NSC} ${NSC_DEV})
create_vrf ${NSA} ${VRF} ${VRF_TABLE} "-" "-"
ip -netns ${NSA} link set dev ${NSA_DEV} vrf ${VRF}
ip -netns ${NSA} link set dev ${NSA_DEV2} vrf ${VRF}
set +e
sleep 1
}
################################################################################
# IPv4
@ -3787,10 +3839,53 @@ use_case_br()
setup_cmd_nsb ip li del vlan100 2>/dev/null
}
# VRF only.
# ns-A device is connected to both ns-B and ns-C on a single VRF but only has
# LLA on the interfaces
use_case_ping_lla_multi()
{
setup_lla_only
# only want reply from ns-A
setup_cmd_nsb sysctl -qw net.ipv6.icmp.echo_ignore_multicast=1
setup_cmd_nsc sysctl -qw net.ipv6.icmp.echo_ignore_multicast=1
log_start
run_cmd_nsb ping -c1 -w1 ${MCAST}%${NSB_DEV}
log_test_addr ${MCAST}%${NSB_DEV} $? 0 "Pre cycle, ping out ns-B"
run_cmd_nsc ping -c1 -w1 ${MCAST}%${NSC_DEV}
log_test_addr ${MCAST}%${NSC_DEV} $? 0 "Pre cycle, ping out ns-C"
# cycle/flap the first ns-A interface
setup_cmd ip link set ${NSA_DEV} down
setup_cmd ip link set ${NSA_DEV} up
sleep 1
log_start
run_cmd_nsb ping -c1 -w1 ${MCAST}%${NSB_DEV}
log_test_addr ${MCAST}%${NSB_DEV} $? 0 "Post cycle ${NSA} ${NSA_DEV}, ping out ns-B"
run_cmd_nsc ping -c1 -w1 ${MCAST}%${NSC_DEV}
log_test_addr ${MCAST}%${NSC_DEV} $? 0 "Post cycle ${NSA} ${NSA_DEV}, ping out ns-C"
# cycle/flap the second ns-A interface
setup_cmd ip link set ${NSA_DEV2} down
setup_cmd ip link set ${NSA_DEV2} up
sleep 1
log_start
run_cmd_nsb ping -c1 -w1 ${MCAST}%${NSB_DEV}
log_test_addr ${MCAST}%${NSB_DEV} $? 0 "Post cycle ${NSA} ${NSA_DEV2}, ping out ns-B"
run_cmd_nsc ping -c1 -w1 ${MCAST}%${NSC_DEV}
log_test_addr ${MCAST}%${NSC_DEV} $? 0 "Post cycle ${NSA} ${NSA_DEV2}, ping out ns-C"
}
use_cases()
{
log_section "Use cases"
log_subsection "Device enslaved to bridge"
use_case_br
log_subsection "Ping LLA with multiple interfaces"
use_case_ping_lla_multi
}
################################################################################