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Allow route change requests to not specify the gateway.

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Only require a gateway to be specified on a route add request.  On
a route change request that does not specify the gateway, the
gateway will remain the same.  This allows changing other route
parameters without having to re-specifying the gateway, like in
"route change 10.0.0.0/8 -mtu 9000".

Update the route(8) manpage to explicitly call out this usage
as being supported.

MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
Reviewed By: eugen (rtsock.c change), rgrimes
Differential Revision: https://reviews.freebsd.org/D14291
This commit is contained in:
Ryan Stone 2018-02-21 19:13:23 +00:00
parent 81ad57b1b8
commit b3b6ff23e7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329743
2 changed files with 22 additions and 7 deletions
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20
sbin/route/route.8
View file

@ -28,7 +28,7 @@
.\" @(#)route.8 8.3 (Berkeley) 3/19/94
.\" $FreeBSD$
.\"
.Dd November 11, 2014
.Dd February 16, 2018
.Dt ROUTE 8
.Os
.Sh NAME
@ -164,15 +164,27 @@ option is specified, the operation will be applied to
the specified FIB
.Pq routing table .
.Pp
The other commands have the following syntax:
The add command has the following syntax:
.Pp
.Bd -ragged -offset indent -compact
.Nm
.Op Fl n
.Cm add
.Op Fl net No \&| Fl host
.Ar destination gateway
.Op Ar netmask
.Op Fl fib Ar number
.Ed
.Pp
and the other commands have the following syntax:
.Pp
.Bd -ragged -offset indent -compact
.Nm
.Op Fl n
.Ar command
.Op Fl net No \&| Fl host
.Ar destination gateway
.Op Ar netmask
.Ar destination
.Op Ar gateway Op Ar netmask
.Op Fl fib Ar number
.Ed
.Pp

9
sys/net/rtsock.c
View file

@ -674,12 +674,15 @@ route_output(struct mbuf *m, struct socket *so, ...)
case RTM_ADD:
case RTM_CHANGE:
if (info.rti_info[RTAX_GATEWAY] == NULL)
senderr(EINVAL);
if (rtm->rtm_type == RTM_ADD) {
if (info.rti_info[RTAX_GATEWAY] == NULL)
senderr(EINVAL);
}
saved_nrt = NULL;
/* support for new ARP code */
if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
if (info.rti_info[RTAX_GATEWAY] != NULL &&
info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
(rtm->rtm_flags & RTF_LLDATA) != 0) {
error = lla_rt_output(rtm, &info);
#ifdef INET6