[Bug 210747] Routing table screwed up when adding routes for IPv6

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210747

            Bug ID: 210747
           Summary: Routing table screwed up when adding routes for IPv6
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tuexen at freebsd.org

Steps to reproduce:

1. Create an interface
sudo ifconfig tun0 create inet6 fd3d:fa7b:d17d::1/48

2. Check routing table
netstat -nrfinet6
Routing tables

Internet6:
Destination                       Gateway                       Flags     Netif
Expire
::/96                             ::1                           UGRS        lo0
::1                               link#2                        UH          lo0
::ffff:0.0.0.0/96                 ::1                           UGRS        lo0
fd3d:fa7b:d17d::/48               link#3                        U          tun0
fd3d:fa7b:d17d::1                 link#3                        UHS         lo0
fe80::/10                         ::1                           UGRS        lo0
fe80::%em0/64                     link#1                        U           em0
fe80::20c:29ff:fe8a:8910%em0      link#1                        UHS         lo0
fe80::%lo0/64                     link#2                        U           lo0
fe80::1%lo0                       link#2                        UHS         lo0
fe80::%tun0/64                    link#3                        U          tun0
fe80::20c:29ff:fe8a:8910%tun0     link#3                        UHS         lo0
ff02::/16                         ::1                           UGRS        lo0

3. Add route
sudo route add -inet6 2001:DB8::1/32 -interface tun0 fd3d:fa7b:d17d::2
add net 2001:DB8::1/32: gateway tun0

4. Check routing table
[freebsd11:~] tuexen% netstat -nrfinet6
Routing tables

Internet6:
Destination                       Gateway                       Flags     Netif
Expire
::/96                             ::1                           UGRS        lo0
::1                               link#2                        UH          lo0
::ffff:0.0.0.0/96                 ::1                           UGRS        lo0
illegal prefixlen
2001:838::/0                      tun0                          US         tun0
fd3d:fa7b:d17d::/48               link#3                        U          tun0
fd3d:fa7b:d17d::1                 link#3                        UHS         lo0
fe80::/10                         ::1                           UGRS        lo0
fe80::%em0/64                     link#1                        U           em0
fe80::20c:29ff:fe8a:8910%em0      link#1                        UHS         lo0
fe80::%lo0/64                     link#2                        U           lo0
fe80::1%lo0                       link#2                        UHS         lo0
fe80::%tun0/64                    link#3                        U          tun0
fe80::20c:29ff:fe8a:8910%tun0     link#3                        UHS         lo0
ff02::/16                         ::1                           UGRS        lo0

The problem is with "illegal prefixlen" and the network being displayed
2001:838::/0.

The problem does not occur when using
sudo route add -inet6 2001:DB8::1/32 fd3d:fa7b:d17d::2
in step 3.

-- 
You are receiving this mail because:
You are the assignee for the bug.