From: Richard Gobert richardbgobert@gmail.com
[ Upstream commit 526682b458b1b56d2e0db027df535cb5cdcfde59 ]
Change the behaviour of ip6_datagram_connect to consider the interface set by the IPV6_UNICAST_IF socket option, similarly to udpv6_sendmsg.
This change is the IPv6 counterpart of the fix for IP_UNICAST_IF. The tests introduced by that patch showed that the incorrect behavior is present in IPv6 as well. This patch fixes the broken test.
Reported-by: kernel test robot oliver.sang@intel.com Link: https://lore.kernel.org/r/202210062117.c7eef1a3-oliver.sang@intel.com Fixes: 0e4d354762ce ("net-next: Fix IP_UNICAST_IF option behavior for connected sockets")
Signed-off-by: Richard Gobert richardbgobert@gmail.com Reviewed-by: David Ahern dsahern@kernel.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv6/datagram.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index 5ecb56522f9d..ba28aeb7cade 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -42,24 +42,29 @@ static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk) { struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); + int oif = sk->sk_bound_dev_if;
memset(fl6, 0, sizeof(*fl6)); fl6->flowi6_proto = sk->sk_protocol; fl6->daddr = sk->sk_v6_daddr; fl6->saddr = np->saddr; - fl6->flowi6_oif = sk->sk_bound_dev_if; fl6->flowi6_mark = sk->sk_mark; fl6->fl6_dport = inet->inet_dport; fl6->fl6_sport = inet->inet_sport; fl6->flowlabel = np->flow_label; fl6->flowi6_uid = sk->sk_uid;
- if (!fl6->flowi6_oif) - fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; + if (!oif) + oif = np->sticky_pktinfo.ipi6_ifindex;
- if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) - fl6->flowi6_oif = np->mcast_oif; + if (!oif) { + if (ipv6_addr_is_multicast(&fl6->daddr)) + oif = np->mcast_oif; + else + oif = np->ucast_oif; + }
+ fl6->flowi6_oif = oif; security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); }