NFSv3 with IPv6 on SLES11 SP2

SLES11 SP2 comes with 3.0.0 and nfs-utils 1.2.3

sles11sp2:~ # uname -a
Linux sles11sp2 3.0.13-0.19-default #1 SMP Fri Feb 3 15:38:23 UTC 2012 (7f256ae) x86_64 x86_64 x86_64 GNU/Linux
sles11sp2:~ #
sles11sp2:~ # rpm -qa | grep nfs-
limal-nfs-server-1.5.3-0.2.11
yast2-nfs-server-2.17.7-1.1.2
nfs-kernel-server-1.2.3-18.17.2
nfs-doc-1.2.3-18.17.2
yast2-nfs-common-2.17.7-1.1.2
nfs-client-1.2.3-18.17.2
limal-nfs-server-perl-1.5.3-0.2.11
yast2-nfs-client-2.17.13-0.5.189
sles11sp2:~ #

Even though the kernel 3.0.0 with nfs-utils-1.2.3 has support for NFSv3 with IPv6 thich seems to be not working with SLES11 SP2

sles11sp2:~ # rpcinfo | grep -w nfs
    100003    2    tcp       0.0.0.0.8.1            nfs        superuser
    100003    3    tcp       0.0.0.0.8.1            nfs        superuser
    100003    2    udp       0.0.0.0.8.1            nfs        superuser
    100003    3    udp       0.0.0.0.8.1            nfs        superuser

This seems to be due to Novell change in the kernel which disabled NFSv3 with IPv6. This was probably part of SLES11-SP1 which was just blindly applied over SLES11SP2

Once you install the kernel sources 'kernel-source-3.0.13-0.19.1', then in /usr/src/linux-3.0.13-0.19/net/sunrpc/svc.c

                        if (strcmp(progp->pg_name, "nfsd") == 0 &&
                            i < 4 &&
                            family == PF_INET6) {
                                /* Don't register NFSv2 or NFSv3 for IPv6
                                 * protocols as we don't support statd
                                 * on IPv6 yet
                                 */
                                dprintk("svc: ... not telling portmap\n");
                                continue;
                        }

This additional check is there on even SLES11-SP1. The nfs-utils (nfs-client and nfs-kernel packages) that are available with SLES11SP1 did not have support for IPv6 in user level daemons like mountd/statd. But with SLES11SP2 and nfs-utils-1.2.3. the support for IPv6 is available in user level daemons so it does not make sense to forcibly disable this. This seems to have been just carried over from SP1 without SP2.

Once you disable this part of code as

#if 0
                        if (strcmp(progp->pg_name, "nfsd") == 0 &&
                            i < 4 &&
                            family == PF_INET6) {
                                /* Don't register NFSv2 or NFSv3 for IPv6
                                 * protocols as we don't support statd
                                 * on IPv6 yet
                                 */
                                dprintk("svc: ... not telling portmap\n");
                                continue;
                        }
#endif

and recompile the module as (you would linux-header, kernel-default-devel and gcc packages installed)

make -C /lib/modules/3.0.13-0.19-default/build M=`pwd` modules

The new module that gets created works well with IPv6 over NFSv3. Once the module has been build by the above make command, place the new module in /lib/modules/2.6.32.43-0.4-default/kernel/net/sunrpc/sunrpc.ko. and reboot the machine to use the new sunrpc module

After reboot if you run 'rpcinfo' you should be able to see that for NFS version 3 IPv6 socket is registered with rpcbind

sles11sp2:~ # rpcinfo | grep -w nfs
    100003    2    tcp       0.0.0.0.8.1            nfs        superuser
    100003    3    tcp       0.0.0.0.8.1            nfs        superuser
    100003    2    udp       0.0.0.0.8.1            nfs        superuser
    100003    3    udp       0.0.0.0.8.1            nfs        superuser
    100003    2    tcp6      ::.8.1                 nfs        superuser
    100003    3    tcp6      ::.8.1                 nfs        superuser
    100003    2    udp6      ::.8.1                 nfs        superuser
    100003    3    udp6      ::.8.1                 nfs        superuser