Date: Fri, 9 Aug 2002 16:47:52 -0700 From: "Qing Li" <Qing.Li@windriver.com> To: "FreeBSD gnats submit" <freebsd-gnats-submit@FreeBSD.org> Subject: kern/41494: static routes set with interface address as gateway are non-functional Message-ID: <DMEGKJAJNLKBGDDBEAIPAECMFPAA.Qing.Li@windriver.com>
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>Number: 41494
>Category: kern
>Synopsis: static routes set with interface address as gateway are
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Aug 09 16:51:24 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Qing Li
>Release: FreeBSD 4.6-PRERELEASE i386
>Organization:
>Environment:
System: FreeBSD t38-108.wrs.com 4.6-PRERELEASE FreeBSD 4.6-PRERELEASE #2:
Mon Jun 17 11:10:00 GMT 2002
root@t38-108.wrs.com:/usr/obj/usr/src/sys/GENERIC i386
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium II/Pentium II Xeon/Celeron (265.37-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x634 Stepping = 4
Features=0x80f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,M
MX>
real memory = 167772160 (163840K bytes)
avail memory = 158187520 (154480K bytes)
pnpbios: Bad PnP BIOS data checksum
Preloaded elf kernel "kernel" at 0xc04c8000.
Pentium Pro MTRR support enabled
>Description:
My interface xl0 is assigned 147.11.38.218.
==========
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 147.11.38.1 UGSc 4 0 xl0
127.0.0.1 127.0.0.1 UH 1 22 lo0
147.11.38/24 link#5 UC 2 0 xl0
147.11.38.1 00:00:0c:07:ac:26 UHLW 5 0 xl0 783
147.11.38.15 147.11.38.218 UGHS 0 3 xl0
147.11.38.218 127.0.0.1 UGHS 1 0 lo0
147.11.38.254 00:02:7e:23:fa:80 UHLW 0 0 xl0 49
Internet6:
Destination Gateway Flags
Netif Expire
::1 ::1 UH
lo0
fe80::%xl0/64 link#5 UC
xl0
fe80::2b0:d0ff:fe84:c8bc%xl0 fe80::2c0:4fff:fe8d:63b9%xl0 UGHS
xl0
fe80::2c0:4fff:fe8d:63b9%xl0 00:c0:4f:8d:63:b9 UHL
lo0
fe80::2e0:ff:fe84:4237%xl0 00:e0:00:84:42:37 UHLW
xl0
fe80::%lo0/64 fe80::1%lo0 Uc
lo0
fe80::1%lo0 link#8 UHL
lo0
ff01::/32 ::1 U
lo0
ff02::%xl0/32 link#5 UC
xl0
ff02::%lo0/32 ::1 UC
lo0
==========
Now I add a host route:
"route add -host 147.11.38.15 147.11.38.218"
Then "ping 147.11.38.15" fails.
This is due to the "G" flag in that static route entry with the gateway
address being one of the interface addresses. During transmission the
route lookup on the gateway address will point the output interface
to the loopback interface.
This route addition should be allowed as a place holder
to be filled in later, similar to of an entry with RTF_LLINFO flag.
I put in the fixes, here is what the routing table shows after the fix
using the same route command,
===========
147.11.38.15 link#5 UHLS 0 3 xl0
===========
"ping 147.11.38.15" now succeeds, that route entry is modified to be
===========
147.11.38.15 8:0:20:d1:64:c6 UHLS 0 3 xl0
===========
Similar problem exists in IPv6.
Unlike "ping", "ping6" returns -1 with an error message
of "No route to host".
>How-To-Repeat:
Add a static route entry to a host that is directely reachable, set
the gateway value using the interface address.
For IPv4
--------
Step 1: route add -host 147.11.38.15 147.11.38.218
Step 2: ping 147.11.38.15
For IPv6
--------
Step 1: route add -host -inet6 fe80::2b0:d0ff:fe84:c8bc%xl0 -inet6 \
fe80::2c0:4fff:fe8d:63b9%xl0
Step 2: ping6 fe80::2b0:d0ff:fe84:c8bc%xl0
>Fix:
/usr/src/net/route.c
*** route.c Mon Aug 5 17:33:39 2002
--- route.c.new Fri Aug 9 15:18:04 2002
***************
*** 1006,1011 ****
--- 1006,1018 ----
rt->rt_gwroute = 0;
return EDQUOT; /* failure */
}
+ if (rt->rt_gwroute->rt_ifp &&
+ (rt->rt_gwroute->rt_ifp->if_flags & IFF_LOOPBACK))
+ {
+ rt->rt_gwroute = 0;
+ rt->rt_flags &= ~RTF_GATEWAY;
+ rt->rt_flags |= RTF_LLINFO;
+ }
}
/*
/usr/src/netinet/if_ether.c
*** if_ether.c Mon Aug 5 17:33:44 2002
--- if_ether.c.new Fri Aug 9 15:15:50 2002
***************
*** 188,194 ****
if ((rt->rt_flags & RTF_HOST) == 0 &&
SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
rt->rt_flags |= RTF_CLONING;
! if (rt->rt_flags & RTF_CLONING) {
/*
* Case 1: This route should come from a route to
iface.
*/
--- 188,194 ----
if ((rt->rt_flags & RTF_HOST) == 0 &&
SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
rt->rt_flags |= RTF_CLONING;
! if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) {
/*
* Case 1: This route should come from a route to
iface.
*/
***************
*** 198,204 ****
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
rt->rt_expire = time_second;
! break;
}
/* Announce a new entry if requested. */
if (rt->rt_flags & RTF_ANNOUNCE)
--- 198,205 ----
SDL(gate)->sdl_type = rt->rt_ifp->if_type;
SDL(gate)->sdl_index = rt->rt_ifp->if_index;
rt->rt_expire = time_second;
! if (rt->rt_flags & RTF_CLONING)
! break;
}
/* Announce a new entry if requested. */
if (rt->rt_flags & RTF_ANNOUNCE)
/usr/src/netinet6/nd6.c
*** nd6.c Tue Apr 30 14:09:54 2002
--- nd6.c.new Fri Aug 9 15:20:11 2002
***************
*** 1227,1233 ****
Bzero(ln, sizeof(*ln));
ln->ln_rt = rt;
/* this is required for "ndp" command. - shin */
! if (req == RTM_ADD) {
/*
* gate should have some valid AF_LINK entry,
* and ln->ln_expire should have some lifetime
--- 1227,1233 ----
Bzero(ln, sizeof(*ln));
ln->ln_rt = rt;
/* this is required for "ndp" command. - shin */
! if ((req == RTM_ADD) && !(rt->rt_flags & RTF_LLINFO)) {
/*
* gate should have some valid AF_LINK entry,
* and ln->ln_expire should have some lifetime
>Release-Note:
>Audit-Trail:
>Unformatted:
non-functional
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