diff options
| author | David Gwynne <dlg@cvs.openbsd.org> | 2018-02-11 00:24:14 +0000 |
|---|---|---|
| committer | David Gwynne <dlg@cvs.openbsd.org> | 2018-02-11 00:24:14 +0000 |
| commit | b5cad63e758681a258401baff81bc4f76111ff0c (patch) | |
| tree | 6f09acb990dac65cd3097f9e58d1f2f4350d0b6e /sys/netinet6/ip6_output.c | |
| parent | ea2c12868ddfa27c668a12315b402d171c8fcca2 (diff) | |
add an ipv6 "don't fragment" flag to mbufs for ip6_output to use.
if you need to send an ipv6 packet with ip6_send(), there's no DF
bit in an ipv6 packet and no way to pass the ip6 options to ip6_output
to tell it to not allow fragmentation. this adds an M_IPV6_DF_OUT
"checksum" flag so something creating ipv6 packets a long way from
ip6_output can easily tell it to not allow fragmentation.
grumbling and ok claudio@
Diffstat (limited to 'sys/netinet6/ip6_output.c')
| -rw-r--r-- | sys/netinet6/ip6_output.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c index 03fc4fae449..4818d7cb441 100644 --- a/sys/netinet6/ip6_output.c +++ b/sys/netinet6/ip6_output.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ip6_output.c,v 1.232 2017/09/01 15:05:31 mpi Exp $ */ +/* $OpenBSD: ip6_output.c,v 1.233 2018/02/11 00:24:13 dlg Exp $ */ /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ /* @@ -656,7 +656,10 @@ reroute: */ tlen = m->m_pkthdr.len; - if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) + if (ISSET(m->m_pkthdr.csum_flags, M_IPV6_DF_OUT)) { + CLR(m->m_pkthdr.csum_flags, M_IPV6_DF_OUT); + dontfrag = 1; + } else if (opt && ISSET(opt->ip6po_flags, IP6PO_DONTFRAG)) dontfrag = 1; else dontfrag = 0; |