diff options
| author | Dmitry Safonov <[email protected]> | 2023-10-23 19:22:08 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2023-10-27 09:35:45 +0000 |
| commit | 953af8e3acb68d2db11937cec3bc5da31de5c12e (patch) | |
| tree | 2c56c02d543050285dd073b65827682066114e26 /net/ipv4/proc.c | |
| parent | net/tcp: Add tcp_hash_fail() ratelimited logs (diff) | |
| download | kernel-953af8e3acb68d2db11937cec3bc5da31de5c12e.tar.gz kernel-953af8e3acb68d2db11937cec3bc5da31de5c12e.zip | |
net/tcp: Ignore specific ICMPs for TCP-AO connections
Similarly to IPsec, RFC5925 prescribes:
">> A TCP-AO implementation MUST default to ignore incoming ICMPv4
messages of Type 3 (destination unreachable), Codes 2-4 (protocol
unreachable, port unreachable, and fragmentation needed -- ’hard
errors’), and ICMPv6 Type 1 (destination unreachable), Code 1
(administratively prohibited) and Code 4 (port unreachable) intended
for connections in synchronized states (ESTABLISHED, FIN-WAIT-1, FIN-
WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT) that match MKTs."
A selftest (later in patch series) verifies that this attack is not
possible in this TCP-AO implementation.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
Acked-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'net/ipv4/proc.c')
| -rw-r--r-- | net/ipv4/proc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index f5b37ebc18c0..5f4654ebff48 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -303,6 +303,7 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD), SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND), SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD), + SNMP_MIB_ITEM("TCPAODroppedIcmps", LINUX_MIB_TCPAODROPPEDICMPS), SNMP_MIB_SENTINEL }; |