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05 April 2024, 19:05:47 UTC
Revision e62d2e110356093c034998e093675df83057e511 authored by Eric Dumazet on 26 July 2022, 11:57:43 UTC, committed by Jakub Kicinski on 27 July 2022, 17:18:21 UTC 
tcp: md5: fix IPv4-mapped support
 
After the blamed commit, IPv4 SYN packets handled
by a dual stack IPv6 socket are dropped, even if
perfectly valid.

$ nstat | grep MD5
TcpExtTCPMD5Failure             5                  0.0

For a dual stack listener, an incoming IPv4 SYN packet
would call tcp_inbound_md5_hash() with @family == AF_INET,
while tp->af_specific is pointing to tcp_sock_ipv6_specific.

Only later when an IPv4-mapped child is created, tp->af_specific
is changed to tcp_sock_ipv6_mapped_specific.

Fixes: 7bbb765b7349 ("net/tcp: Merge TCP-MD5 inbound callbacks")
Reported-by: Brian Vazquez <brianvv@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Dmitry Safonov <dima@arista.com>
Tested-by: Leonard Crestez <cdleonard@gmail.com>
Link: https://lore.kernel.org/r/20220726115743.2759832-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent 5a15912
History
Tip revision: e62d2e110356093c034998e093675df83057e511 authored by Eric Dumazet on 26 July 2022, 11:57:43 UTC
tcp: md5: fix IPv4-mapped support
Tip revision: e62d2e1
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