d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

When changing an indirect route, kernel routing code allocates

Browse Source 
a route to the gateway and caches it in the route structure.
It may happen (if the routing table is screwed) that the gateway
route is the same route as the one being modified, in which case
a kernel reports EDQUOT.  Be more verbose about this:

# route add -net 10 192.168.4.65
add net 10: gateway 192.168.4.65
# netstat -rn -finet
Routing tables

Internet:
Destination        Gateway            Flags     Refs     Use     Netif Expire
default            192.168.4.65       UGSc        1        7      rl0
10                 192.168.4.65       UGSc        0        0      rl0
127.0.0.1          127.0.0.1          UH          0      178      lo0
192.168.4          link#1             UC          2        0      rl0 =>
192.168.4.65       0:d0:b7:16:9c:c6   UHLW        2        0      rl0   1123

Before:

# route change -net 10 10.0.0.1
route: writing to routing socket: Disc quota exceeded
change net 10: gateway 10.0.0.1: Disc quota exceeded

After:

# ./route change -net 10 10.0.0.1
route: writing to routing socket: Disc quota exceeded
change net 10: gateway 10.0.0.1: gateway uses the same route

PR:		bin/1093, misc/26833
This commit is contained in:
Ruslan Ermilov 2001-06-08 12:44:25 +00:00
parent e6577f69a4
commit 1d36c8992d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77908
2 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sbin/route/route.8
View File

@ -32,9 +32,9 @@
.\" @(#)route.8 8.3 (Berkeley) 3/19/94
.\" $FreeBSD$
.\"
.Dd March 19, 1994
.Dd June 8, 2001
.Dt ROUTE 8
.Os BSD 4.4
.Os
.Sh NAME
.Nm route
.Nd manually manipulate the routing tables
@ -362,6 +362,12 @@ wasn't present in the tables.
An add operation was attempted, but the system was
low on resources and was unable to allocate memory
to create the new entry.
.It "gateway uses the same route"
A
.Cm change
operation resulted in a route whose gateway uses the
same route as the one being changed.
The next-hop gateway should be reachable through a different route.
.El
.Pp
The

3
sbin/route/route.c
View File

@ -741,6 +741,9 @@ newroute(argc, argv)
case ENOBUFS:
err = "routing table overflow";
break;
case EDQUOT: /* handle recursion avoidance in rt_setgate() */
err = "gateway uses the same route";
break;
default:
err = strerror(oerrno);
break;