openvswitch: Fixed nd target mask field in the flow dump.

stable inclusion
from stable-v5.10.110
commit e36c45263a30b5556f80d4e085637fe5693567fe
bugzilla: https://gitee.com/openeuler/kernel/issues/I574AL

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e36c45263a30b5556f80d4e085637fe5693567fe

--------------------------------

commit f19c4445 upstream.

IPv6 nd target mask was not getting populated in flow dump.

In the function __ovs_nla_put_key the icmp code mask field was checked
instead of icmp code key field to classify the flow as neighbour discovery.

ufid:bdfbe3e5-60c2-43b0-a5ff-dfcac1c37328, recirc_id(0),dp_hash(0/0),
skb_priority(0/0),in_port(ovs-nm1),skb_mark(0/0),ct_state(0/0),
ct_zone(0/0),ct_mark(0/0),ct_label(0/0),
eth(src=00:00:00:00:00:00/00:00:00:00:00:00,
dst=00:00:00:00:00:00/00:00:00:00:00:00),
eth_type(0x86dd),
ipv6(src=::/::,dst=::/::,label=0/0,proto=58,tclass=0/0,hlimit=0/0,frag=no),
icmpv6(type=135,code=0),
nd(target=2001::2/::,
sll=00:00:00:00:00:00/00:00:00:00:00:00,
tll=00:00:00:00:00:00/00:00:00:00:00:00),
packets:10, bytes:860, used:0.504s, dp:ovs, actions:ovs-nm2

Fixes: e6445719 (openvswitch: Restructure datapath.c and flow.c)
Signed-off-by: NMartin Varghese <martin.varghese@nokia.com>
Link: https://lore.kernel.org/r/20220328054148.3057-1-martinvarghesenokia@gmail.comSigned-off-by: NPaolo Abeni <pabeni@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYu Liao <liaoyu15@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

net/openvswitch/flow_netlink.c

@@ -2201,8 +2201,8 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
 			icmpv6_key->icmpv6_type = ntohs(output->tp.src);
 			icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
 
-			if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
-			    icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
+			if (swkey->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
+			    swkey->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 				struct ovs_key_nd *nd_key;
 
 				nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));