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|
/*
* In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
* protocol
*
* Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
* RFC 3530: "Network File System (NFS) version 4 Protocol"
*
* Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
* Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
*
* Descended from net/sunrpc/pmap_clnt.c,
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/xprtsock.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_BIND
#endif
#define RPCBIND_PROGRAM (100000u)
#define RPCBIND_PORT (111u)
enum {
RPCBPROC_NULL,
RPCBPROC_SET,
RPCBPROC_UNSET,
RPCBPROC_GETPORT,
RPCBPROC_GETADDR = 3, /* alias for GETPORT */
RPCBPROC_DUMP,
RPCBPROC_CALLIT,
RPCBPROC_BCAST = 5, /* alias for CALLIT */
RPCBPROC_GETTIME,
RPCBPROC_UADDR2TADDR,
RPCBPROC_TADDR2UADDR,
RPCBPROC_GETVERSADDR,
RPCBPROC_INDIRECT,
RPCBPROC_GETADDRLIST,
RPCBPROC_GETSTAT,
};
#define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
#define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
#define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
/*
* r_addr
*
* Quoting RFC 3530, section 2.2:
*
* For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
* US-ASCII string:
*
* h1.h2.h3.h4.p1.p2
*
* The prefix, "h1.h2.h3.h4", is the standard textual form for
* representing an IPv4 address, which is always four octets long.
* Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
* the first through fourth octets each converted to ASCII-decimal.
* Assuming big-endian ordering, p1 and p2 are, respectively, the first
* and second octets each converted to ASCII-decimal. For example, if a
* host, in big-endian order, has an address of 0x0A010307 and there is
* a service listening on, in big endian order, port 0x020F (decimal
* 527), then the complete universal address is "10.1.3.7.2.15".
*
* ...
*
* For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
* US-ASCII string:
*
* x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
*
* The suffix "p1.p2" is the service port, and is computed the same way
* as with universal addresses for TCP and UDP over IPv4. The prefix,
* "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
* representing an IPv6 address as defined in Section 2.2 of [RFC2373].
* Additionally, the two alternative forms specified in Section 2.2 of
* [RFC2373] are also acceptable.
*
* XXX: Currently this implementation does not explicitly convert the
* stored address to US-ASCII on non-ASCII systems.
*/
#define RPCB_MAXADDRLEN (128u)
/*
* r_owner
*
* The "owner" is allowed to unset a service in the rpcbind database.
* We always use the following (arbitrary) fixed string.
*/
#define RPCB_OWNER_STRING "rpcb"
#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
static void rpcb_getport_done(struct rpc_task *, void *);
static struct rpc_program rpcb_program;
struct rpcbind_args {
struct rpc_xprt * r_xprt;
u32 r_prog;
u32 r_vers;
u32 r_prot;
unsigned short r_port;
char * r_netid;
char r_addr[RPCB_MAXADDRLEN];
char * r_owner;
};
static struct rpc_procinfo rpcb_procedures2[];
static struct rpc_procinfo rpcb_procedures3[];
struct rpcb_info {
int rpc_vers;
struct rpc_procinfo * rpc_proc;
};
static struct rpcb_info rpcb_next_version[];
static struct rpcb_info rpcb_next_version6[];
static void rpcb_getport_prepare(struct rpc_task *task, void *calldata)
{
struct rpcbind_args *map = calldata;
struct rpc_xprt *xprt = map->r_xprt;
struct rpc_message msg = {
.rpc_proc = rpcb_next_version[xprt->bind_index].rpc_proc,
.rpc_argp = map,
.rpc_resp = &map->r_port,
};
rpc_call_setup(task, &msg, 0);
}
static void rpcb_map_release(void *data)
{
struct rpcbind_args *map = data;
xprt_put(map->r_xprt);
kfree(map);
}
static const struct rpc_call_ops rpcb_getport_ops = {
.rpc_call_prepare = rpcb_getport_prepare,
.rpc_call_done = rpcb_getport_done,
.rpc_release = rpcb_map_release,
};
static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
{
xprt_clear_binding(xprt);
rpc_wake_up_status(&xprt->binding, status);
}
static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
int proto, int version, int privileged)
{
struct rpc_create_args args = {
.protocol = proto,
.address = srvaddr,
.addrsize = sizeof(struct sockaddr_in),
.servername = hostname,
.program = &rpcb_program,
.version = version,
.authflavor = RPC_AUTH_UNIX,
.flags = (RPC_CLNT_CREATE_NOPING |
RPC_CLNT_CREATE_INTR),
};
switch (srvaddr->sa_family) {
case AF_INET:
((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
break;
case AF_INET6:
((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
break;
default:
return NULL;
}
if (!privileged)
args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
return rpc_create(&args);
}
/**
* rpcb_register - set or unset a port registration with the local rpcbind svc
* @prog: RPC program number to bind
* @vers: RPC version number to bind
* @prot: transport protocol to use to make this request
* @port: port value to register
* @okay: result code
*
* port == 0 means unregister, port != 0 means register.
*
* This routine supports only rpcbind version 2.
*/
int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
};
struct rpcbind_args map = {
.r_prog = prog,
.r_vers = vers,
.r_prot = prot,
.r_port = port,
};
struct rpc_message msg = {
.rpc_proc = &rpcb_procedures2[port ?
RPCBPROC_SET : RPCBPROC_UNSET],
.rpc_argp = &map,
.rpc_resp = okay,
};
struct rpc_clnt *rpcb_clnt;
int error = 0;
dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
"rpcbind\n", (port ? "" : "un"),
prog, vers, prot, port);
rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
XPRT_TRANSPORT_UDP, 2, 1);
if (IS_ERR(rpcb_clnt))
return PTR_ERR(rpcb_clnt);
error = rpc_call_sync(rpcb_clnt, &msg, 0);
rpc_shutdown_client(rpcb_clnt);
if (error < 0)
printk(KERN_WARNING "RPC: failed to contact local rpcbind "
"server (errno %d).\n", -error);
dprintk("RPC: registration status %d/%d\n", error, *okay);
return error;
}
/**
* rpcb_getport_sync - obtain the port for an RPC service on a given host
* @sin: address of remote peer
* @prog: RPC program number to bind
* @vers: RPC version number to bind
* @prot: transport protocol to use to make this request
*
* Called from outside the RPC client in a synchronous task context.
* Uses default timeout parameters specified by underlying transport.
*
* XXX: Needs to support IPv6, and rpcbind versions 3 and 4
*/
int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog,
__u32 vers, int prot)
{
struct rpcbind_args map = {
.r_prog = prog,
.r_vers = vers,
.r_prot = prot,
.r_port = 0,
};
struct rpc_mes
|