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sctp: Don't advertise IPv4 addresses if ipv6only is set on the socket

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If a socket is set ipv6only, it will still send IPv4 addresses in the
INIT and INIT_ACK packets. This potentially misleads the peer into using
them, which then would cause association termination.

The fix is to not add IPv4 addresses to ipv6only sockets.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Tested-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2020-06-24 17:34:18 -03:00 • committed by David S. Miller
parent b6186d413b
commit 471e39df96
4 changed files with 12 additions and 5 deletions
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3
net/sctp/protocol.c
View file

@ -148,7 +148,8 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
* sock as well as the remote peer.
*/
if (addr->a.sa.sa_family == AF_INET &&
!(copy_flags & SCTP_ADDR4_PEERSUPP))
(!(copy_flags & SCTP_ADDR4_ALLOWED) ||
!(copy_flags & SCTP_ADDR4_PEERSUPP)))
continue;
if (addr->a.sa.sa_family == AF_INET6 &&
(!(copy_flags & SCTP_ADDR6_ALLOWED) ||