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Documentation: networking/tcp_ao: typo and grammar fixes

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Fix multiple grammatical issues and add a missing period to improve
readability.

Signed-off-by: Leo Stone <leocstone@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240929005001.370991-1-leocstone@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Leo Stone 2024-09-28 17:49:34 -07:00 committed by Jakub Kicinski
parent 35f1210879
commit 2d7a098b9d
1 changed files with 10 additions and 10 deletions
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20
Documentation/networking/tcp_ao.rst
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@ -9,7 +9,7 @@ segments between trusted peers. It adds a new TCP header option with
a Message Authentication Code (MAC). MACs are produced from the content
of a TCP segment using a hashing function with a password known to both peers.
The intent of TCP-AO is to deprecate TCP-MD5 providing better security,
key rotation and support for variety of hashing algorithms.
key rotation and support for a variety of hashing algorithms.
1. Introduction
===============
@ -164,9 +164,9 @@ A: It should not, no action needs to be performed [7.5.2.e]::
is not available, no action is required (RNextKeyID of a received
segment needs to match the MKT’s SendID).
Q: How current_key is set and when does it change? It is a user-triggered
change, or is it by a request from the remote peer? Is it set by the user
explicitly, or by a matching rule?
Q: How is current_key set, and when does it change? Is it a user-triggered
change, or is it triggered by a request from the remote peer? Is it set by the
user explicitly, or by a matching rule?
A: current_key is set by RNextKeyID [6.1]::
@ -233,8 +233,8 @@ always have one current_key [3.3]::
Q: Can a non-TCP-AO connection become a TCP-AO-enabled one?
A: No: for already established non-TCP-AO connection it would be impossible
to switch using TCP-AO as the traffic key generation requires the initial
A: No: for an already established non-TCP-AO connection it would be impossible
to switch to using TCP-AO, as the traffic key generation requires the initial
sequence numbers. Paraphrasing, starting using TCP-AO would require
re-establishing the TCP connection.
@ -292,7 +292,7 @@ no transparency is really needed and modern BGP daemons already have
Linux provides a set of ``setsockopt()s`` and ``getsockopt()s`` that let
userspace manage TCP-AO on a per-socket basis. In order to add/delete MKTs
``TCP_AO_ADD_KEY`` and ``TCP_AO_DEL_KEY`` TCP socket options must be used
``TCP_AO_ADD_KEY`` and ``TCP_AO_DEL_KEY`` TCP socket options must be used.
It is not allowed to add a key on an established non-TCP-AO connection
as well as to remove the last key from TCP-AO connection.
@ -361,7 +361,7 @@ not implemented.
4. ``setsockopt()`` vs ``accept()`` race
========================================
In contrast with TCP-MD5 established connection which has just one key,
In contrast with an established TCP-MD5 connection which has just one key,
TCP-AO connections may have many keys, which means that accepted connections
on a listen socket may have any amount of keys as well. As copying all those
keys on a first properly signed SYN would make the request socket bigger, that
@ -374,7 +374,7 @@ keys from sockets that were already established, but not yet ``accept()``'ed,
hanging in the accept queue.
The reverse is valid as well: if userspace adds a new key for a peer on
a listener socket, the established sockets in accept queue won't
a listener socket, the established sockets in the accept queue won't
have the new keys.
At this moment, the resolution for the two races:
@ -382,7 +382,7 @@ At this moment, the resolution for the two races:
and ``setsockopt(TCP_AO_DEL_KEY)`` vs ``accept()`` is delegated to userspace.
This means that it's expected that userspace would check the MKTs on the socket
that was returned by ``accept()`` to verify that any key rotation that
happened on listen socket is reflected on the newly established connection.
happened on the listen socket is reflected on the newly established connection.
This is a similar "do-nothing" approach to TCP-MD5 from the kernel side and
may be changed later by introducing new flags to ``tcp_ao_add``