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| author | Dmitry Safonov <dima@arista.com> | 2023-10-23 20:21:58 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-27 10:35:44 +0100 |
| commit | 1e03d32bea8e782b7d31769c25a5fae8a5044488 (patch) | |
| tree | 1ee72a2671735816f359d15cc51c56362732abd7 /net/ipv6/tcp_ipv6.c | |
| parent | 7c2ffaf21bd67f73d21560995ce17eaf5fc1d37f (diff) | |
| download | linux-stable-1e03d32bea8e782b7d31769c25a5fae8a5044488.tar.gz linux-stable-1e03d32bea8e782b7d31769c25a5fae8a5044488.tar.bz2 linux-stable-1e03d32bea8e782b7d31769c25a5fae8a5044488.zip | |
net/tcp: Add TCP-AO sign to outgoing packets
Using precalculated traffic keys, sign TCP segments as prescribed by
RFC5925. Per RFC, TCP header options are included in sign calculation:
"The TCP header, by default including options, and where the TCP
checksum and TCP-AO MAC fields are set to zero, all in network-
byte order." (5.1.3)
tcp_ao_hash_header() has exclude_options parameter to optionally exclude
TCP header from hash calculation, as described in RFC5925 (9.1), this is
needed for interaction with middleboxes that may change "some TCP
options". This is wired up to AO key flags and setsockopt() later.
Similarly to TCP-MD5 hash TCP segment fragments.
From this moment a user can start sending TCP-AO signed segments with
one of crypto ahash algorithms from supported by Linux kernel. It can
have a user-specified MAC length, to either save TCP option header space
or provide higher protection using a longer signature.
The inbound segments are not yet verified, TCP-AO option is ignored and
they are accepted.
Co-developed-by: Francesco Ruggeri <fruggeri@arista.com>
Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Co-developed-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Acked-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 074e16fe00e0..301b2498d793 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1920,6 +1920,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { #endif #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v6_ao_lookup, + .calc_ao_hash = tcp_v6_ao_hash_skb, .ao_parse = tcp_v6_parse_ao, .ao_calc_key_sk = tcp_v6_ao_calc_key_sk, #endif @@ -1953,6 +1954,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { #endif #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v6_ao_lookup, + .calc_ao_hash = tcp_v4_ao_hash_skb, .ao_parse = tcp_v6_parse_ao, #endif }; |