On Mon, Jun 30, 2008 at 06:46:01PM -0400, Chuck Lever wrote:
> In order to advertise NFS-related services on IPv6 interfaces via
> rpcbind, the kernel RPC server implementation must use
> rpcb_v4_register() instead of rpcb_register().
>
> Legacy support (register using portmapper/rpcbindv2) is still available.
> The new rpcbind version is not used unless enabled via a CONFIG option.
So a kernel built with CONFIG_SUNRPC_REGISTER_V4 will no longer support
old userspace?
--b.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
>
> net/sunrpc/svc.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 73 insertions(+), 0 deletions(-)
>
>
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index c31a1e4..13cca03 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -749,6 +749,74 @@ svc_exit_thread(struct svc_rqst *rqstp)
> }
> EXPORT_SYMBOL(svc_exit_thread);
>
> +#ifdef CONFIG_SUNRPC_REGISTER_V4
> +/*
> + * Registering kernel RPC services with rpcbind version 2 will work
> + * over either IPv4 or IPv6, since the Linux kernel always registers
> + * services for the "any" address.
> + *
> + * However, the local rpcbind daemon listens on either only AF_INET
> + * or AF_INET6 (never both). When it listens on AF_INET6, an rpcbind
> + * version 2 registration will result in registering the service at
> + * IN6ADDR_ANY, even if the RPC service being registered is not
> + * IPv6-enabled.
> + *
> + * Rpcbind version 4 allows us to be a little more specific. Kernel
> + * RPC services that don't yet support AF_INET6 can register
> + * themselves as IPv4-only with the local rpcbind daemon, even if the
> + * daemon is listening only on AF_INET6.
> + *
> + * And, registering IPv6-enabled kernel RPC services via AF_INET6
> + * verifies that the local user space rpcbind daemon is properly
> + * configured to support remote AF_INET6 rpcbind requests.
> + *
> + * An AF_INET6 registration request will fail if the local rpcbind
> + * daemon is not set up to listen on AF_INET6. Likewise, we fail
> + * AF_INET6 registration requests if svc_register() is configured to
> + * support only rpcbind version 2.
> + */
> +static int __svc_register(const u32 program, const u32 version,
> + const sa_family_t family,
> + const unsigned short protocol,
> + const unsigned short port)
> +{
> + struct sockaddr_in sin = {
> + .sin_family = AF_INET,
> + .sin_addr.s_addr = htonl(INADDR_ANY),
> + .sin_port = htons(port),
> + };
> + struct sockaddr_in6 sin6 = {
> + .sin6_family = AF_INET6,
> + .sin6_addr = IN6ADDR_ANY_INIT,
> + .sin6_port = htons(port),
> + };
> + struct sockaddr *sap;
> + char *netid;
> + int error, result;
> +
> + switch (family) {
> + case AF_INET:
> + sap = (struct sockaddr *)&sin;
> + netid = RPCBIND_NETID_TCP;
> + if (protocol == IPPROTO_UDP)
> + netid = RPCBIND_NETID_UDP;
> + break;
> + case AF_INET6:
> + sap = (struct sockaddr *)&sin6;
> + netid = RPCBIND_NETID_TCP6;
> + if (protocol == IPPROTO_UDP)
> + netid = RPCBIND_NETID_UDP6;
> + break;
> + default:
> + return -EAFNOSUPPORT;
> + }
> +
> + error = rpcb_v4_register(program, version, sap, netid, &result);
> + if (!result)
> + error = -EACCES;
> + return error;
> +}
> +#else
> static int __svc_register(const u32 program, const u32 version,
> sa_family_t family,
> const unsigned short protocol,
> @@ -756,11 +824,15 @@ static int __svc_register(const u32 program, const u32 version,
> {
> int error, result;
>
> + if (family != AF_INET)
> + return -EAFNOSUPPORT;
> +
> error = rpcb_register(program, version, protocol, port, &result);
> if (!result)
> error = -EACCES;
> return error;
> }
> +#endif
>
> /**
> * svc_register - register an RPC service with the local portmapper
> @@ -768,6 +840,7 @@ static int __svc_register(const u32 program, const u32 version,
> * @protocol: transport protocol number to advertise
> * @port: port to advertise
> *
> + * Service is registered for any address in serv's address family
> */
> int svc_register(const struct svc_serv *serv, const unsigned short protocol,
> const unsigned short port)
>
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