The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=1f5b1de1fdf2924066c1851ed6c73f36fe20b438
commit 1f5b1de1fdf2924066c1851ed6c73f36fe20b438 Author: Michael Tuexen <[email protected]> AuthorDate: 2026-01-16 11:49:40 +0000 Commit: Michael Tuexen <[email protected]> CommitDate: 2026-01-16 11:49:40 +0000 ipv6: account for jumbo payload option If a jumbo payload option is added, the length of the mbuf chain is increased by 8 but the actual hop-by-hop extension header with the jumbo playload option is only inserted in the packet if there are other options. Therefore, adjust optlen to reflect the actual size of IPv6 extension headers including the hop-by-hop extension header containing the jumbo payload option. Reported by: [email protected] Reviewed by: markj, Timo Voelker MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D54394 --- sys/netinet6/ip6_output.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c index eb5a3a971ea0..d61bc983cc12 100644 --- a/sys/netinet6/ip6_output.c +++ b/sys/netinet6/ip6_output.c @@ -556,6 +556,7 @@ ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) goto freehdrs; ip6->ip6_plen = 0; + optlen += 8; /* JUMBOOPTLEN */ } else ip6->ip6_plen = htons(plen); nexthdrp = &ip6->ip6_nxt;
