https://github.com/torvalds/linux
Revision 86f1e3a8489f6a0232c1f3bc2bdb379f5ccdecec authored by Leonard Crestez on 15 October 2021, 07:26:04 UTC, committed by David S. Miller on 15 October 2021, 13:36:57 UTC
With net.ipv4.tcp_l3mdev_accept=1 it is possible for a listen socket to accept connection from the same client address in different VRFs. It is also possible to set different MD5 keys for these clients which differ only in the tcpm_l3index field. This appears to work when distinguishing between different VRFs but not between non-VRF and VRF connections. In particular: * tcp_md5_do_lookup_exact will match a non-vrf key against a vrf key. This means that adding a key with l3index != 0 after a key with l3index == 0 will cause the earlier key to be deleted. Both keys can be present if the non-vrf key is added later. * _tcp_md5_do_lookup can match a non-vrf key before a vrf key. This casues failures if the passwords differ. Fix this by making tcp_md5_do_lookup_exact perform an actual exact comparison on l3index and by making __tcp_md5_do_lookup perfer vrf-bound keys above other considerations like prefixlen. Fixes: dea53bb80e07 ("tcp: Add l3index to tcp_md5sig_key and md5 functions") Signed-off-by: Leonard Crestez <cdleonard@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 46393d6
Tip revision: 86f1e3a8489f6a0232c1f3bc2bdb379f5ccdecec authored by Leonard Crestez on 15 October 2021, 07:26:04 UTC
tcp: md5: Fix overlap between vrf and non-vrf keys
tcp: md5: Fix overlap between vrf and non-vrf keys
Tip revision: 86f1e3a
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lib | ||
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net | ||
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.gitattributes | -rw-r--r-- | 62 bytes |
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