The branch main has been updated by tuexen:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=a7ba00a438a64b34219f2990b3f7348126f7b4ab

commit a7ba00a438a64b34219f2990b3f7348126f7b4ab
Author:     Michael Tuexen <tue...@freebsd.org>
AuthorDate: 2021-12-28 09:23:31 +0000
Commit:     Michael Tuexen <tue...@freebsd.org>
CommitDate: 2021-12-28 09:23:31 +0000

    sctp: minor improvements in sctp_get_frag_point
    MFC after:      3 days
---
 sys/netinet/sctp_output.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/netinet/sctp_output.c b/sys/netinet/sctp_output.c
index e77517de2973..17a4df2243e2 100644
--- a/sys/netinet/sctp_output.c
+++ b/sys/netinet/sctp_output.c
@@ -6237,13 +6237,15 @@ sctp_get_frag_point(struct sctp_tcb *stcb)
                        overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
                }
        } else {
-               overhead += sizeof(struct sctp_idata_chunk);
+               overhead += sizeof(struct sctp_data_chunk);
                if (sctp_auth_is_required_chunk(SCTP_DATA, 
asoc->peer_auth_chunks)) {
                        overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
                }
        }
+       KASSERT(overhead % 4 == 0,
+           ("overhead (%u) not a multiple of 4", overhead));
        /* Consider padding. */
-       if (asoc->smallest_mtu % 4) {
+       if (asoc->smallest_mtu % 4 > 0) {
                overhead += (asoc->smallest_mtu % 4);
        }
        KASSERT(asoc->smallest_mtu > overhead,

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