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tcp: Use structures to construct initial TCP options

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As a rule, we prefer constructing packets with matching C structures,
rather than building them byte by byte.  However, one case we still build
byte by byte is the TCP options we include in SYN packets (in fact the only
time we generate TCP options on the tap interface).

Rework this to use a structure and initialisers which make it a bit
clearer what's going on.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by; Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-10-21 18:40:29 +11:00 • committed by Stefano Brivio
parent b4dace8f46
commit 9e5df350d6
3 changed files with 67 additions and 20 deletions

2
tcp_buf.c
View file

@ -282,7 +282,7 @@ int tcp_buf_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags)
seq = conn->seq_to_tap;
ret = tcp_prepare_flags(c, conn, flags, &payload->th,
payload->opts, &optlen);
&payload->opts, &optlen);
if (ret <= 0) {
if (CONN_V4(conn))
tcp4_flags_used--;