diff options
Diffstat (limited to 'sys/netinet/ip_output.c')
| -rw-r--r-- | sys/netinet/ip_output.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c index be360787aa3..93a75eabf13 100644 --- a/sys/netinet/ip_output.c +++ b/sys/netinet/ip_output.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ip_output.c,v 1.79 2000/07/29 22:51:22 angelos Exp $ */ +/* $OpenBSD: ip_output.c,v 1.80 2000/09/18 22:06:37 provos Exp $ */ /* $NetBSD: ip_output.c,v 1.28 1996/02/13 23:43:07 christos Exp $ */ /* @@ -545,6 +545,14 @@ ip_output(m0, va_alist) m->m_flags &= ~M_BCAST; sendit: + /* + * If we're doing Path MTU discovery, we need to set DF unless + * the route's MTU is locked. + */ + if ((flags & IP_MTUDISC) && ro->ro_rt && + (ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) + ip->ip_off |= IP_DF; + #ifdef IPSEC /* * Check if the packet needs encapsulation. |