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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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8
include/net/sctp/constants.h
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@@ -353,11 +353,13 @@ enum {
ipv4_is_anycast_6to4(a))
/* Flags used for the bind address copy functions. */
#define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by
#define SCTP_ADDR4_ALLOWED 0x00000001 /* IPv4 address is allowed by
local sock family */
#define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by
#define SCTP_ADDR6_ALLOWED 0x00000002 /* IPv6 address is allowed by
local sock family */
#define SCTP_ADDR4_PEERSUPP 0x00000004 /* IPv4 address is supported by
peer */
#define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by
#define SCTP_ADDR6_PEERSUPP 0x00000008 /* IPv6 address is supported by
peer */
/* Reasons to retransmit. */