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TCP RACK: fix RSM computation for TCP fast open

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When spitting an RSM containing the SYN and data, honor the
sequence number used by the SYN flag when computing the offset
in the socket buffer.

PR:			297006
Reviewed by:		rrs, Peter Lei
MFC after:		3 days
MFC to:			stable/15
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D61149
This commit is contained in:
Michael Tuexen committed 2026-11-07 14:33:45 +01:00
1 parent 4ca9291004
commit ff066579fd
1 file changed
+13 -2
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sys/netinet/tcp_stacks/rack.c
+13 -2
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@@ -6892,7 +6892,7 @@ static void
rack_setup_offset_for_rsm(struct tcp_rack *rack, struct rack_sendmap *src_rsm, struct rack_sendmap *rsm)
{
struct mbuf *m;
uint32_t soff;
uint32_t soff, start;
if (src_rsm->m &&
((src_rsm->orig_m_len != src_rsm->m->m_len) ||
@@ -6901,7 +6901,10 @@ rack_setup_offset_for_rsm(struct tcp_rack *rack, struct rack_sendmap *src_rsm, s
rack_adjust_orig_mlen(src_rsm);
}
m = src_rsm->m;
soff = src_rsm->soff + (src_rsm->r_end - src_rsm->r_start);
start = src_rsm->r_start;
if ((src_rsm->r_flags & RACK_HAS_SYN) != 0)
start++;
soff = src_rsm->soff + (src_rsm->r_end - start);
while (soff >= m->m_len) {
/* Move out past this mbuf */
soff -= m->m_len;
@@ -6924,6 +6927,14 @@ rack_setup_offset_for_rsm(struct tcp_rack *rack, struct rack_sendmap *src_rsm, s
return;
}
}
if ((src_rsm->r_flags & RACK_HAS_SYN) != 0 &&
src_rsm->r_end == src_rsm->r_start + 1) {
/* src_rsm is a SYN segment without data */
src_rsm->m = NULL;
src_rsm->soff = 0;
src_rsm->orig_m_len = 0;
src_rsm->orig_t_space = 0;
}
rsm->m = m;
rsm->soff = soff;
rsm->orig_m_len = m->m_len;