Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 016/342] ipv6/udp: use sticky pktinfo egress ifindex on connect() | Date | Tue, 01 Mar 2016 23:53:48 +0000 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Paolo Abeni <pabeni@redhat.com>
[ Upstream commit 1cdda91871470f15e79375991bd2eddc6e86ddb1 ]
Currently, the egress interface index specified via IPV6_PKTINFO is ignored by __ip6_datagram_connect(), so that RFC 3542 section 6.7 can be subverted when the user space application calls connect() before sendmsg(). Fix it by initializing properly flowi6_oif in connect() before performing the route lookup.
Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ipv6/datagram.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -162,6 +162,9 @@ ipv4_connected: fl6.fl6_dport = inet->inet_dport; fl6.fl6_sport = inet->inet_sport; + if (!fl6.flowi6_oif) + fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; + if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) fl6.flowi6_oif = np->mcast_oif;
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