SUNRPC: Support registering IPv6 interfaces with local rpcbind daemon

Introduce a new API to register RPC services on IPv6 interfaces to allow
the NFS server and lockd to advertise on IPv6 networks.

Unlike rpcb_register(), the new rpcb_v4_register() function uses rpcbind
protocol version 4 to contact the local rpcbind daemon.  The version 4
SET/UNSET procedures allow services to register address families besides
AF_INET, register at specific network interfaces, and register transport
protocols besides UDP and TCP.  All of this functionality is exposed via
the new rpcb_v4_register() kernel API.

A user-space rpcbind daemon implementation that supports version 4 of the
rpcbind protocol is required in order to make use of this new API.

Note that rpcbind version 3 is sufficient to support the new rpcbind
facilities listed above, but most extant implementations use version 4.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2008-07-14 16:03:30 -04:00 committed by Trond Myklebust
parent babe80eb49
commit c2e1b09ff2
2 changed files with 177 additions and 4 deletions

View File

@ -125,6 +125,9 @@ void rpc_shutdown_client(struct rpc_clnt *);
void rpc_release_client(struct rpc_clnt *);
int rpcb_register(u32, u32, int, unsigned short, int *);
int rpcb_v4_register(const u32 program, const u32 version,
const struct sockaddr *address,
const char *netid, int *result);
int rpcb_getport_sync(struct sockaddr_in *, u32, u32, int);
void rpcb_getport_async(struct rpc_task *);

View File

@ -87,6 +87,7 @@ struct rpcbind_args {
static struct rpc_procinfo rpcb_procedures2[];
static struct rpc_procinfo rpcb_procedures3[];
static struct rpc_procinfo rpcb_procedures4[];
struct rpcb_info {
u32 rpc_vers;
@ -122,6 +123,12 @@ static const struct sockaddr_in rpcb_inaddr_loopback = {
.sin_port = htons(RPCBIND_PORT),
};
static const struct sockaddr_in6 rpcb_in6addr_loopback = {
.sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_LOOPBACK_INIT,
.sin6_port = htons(RPCBIND_PORT),
};
static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr,
size_t addrlen, u32 version)
{
@ -196,13 +203,38 @@ static int rpcb_register_call(struct sockaddr *addr, size_t addrlen,
* 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
* @prot: transport protocol to register
* @port: port value to register
* @okay: result code
* @okay: OUT: result code
*
* port == 0 means unregister, port != 0 means register.
* RPC services invoke this function to advertise their contact
* information via the system's rpcbind daemon. RPC services
* invoke this function once for each [program, version, transport]
* tuple they wish to advertise.
*
* This routine supports only rpcbind version 2.
* Callers may also unregister RPC services that are no longer
* available by setting the passed-in port to zero. This removes
* all registered transports for [program, version] from the local
* rpcbind database.
*
* Returns zero if the registration request was dispatched
* successfully and a reply was received. The rpcbind daemon's
* boolean result code is stored in *okay.
*
* Returns an errno value and sets *result to zero if there was
* some problem that prevented the rpcbind request from being
* dispatched, or if the rpcbind daemon did not respond within
* the timeout.
*
* This function uses rpcbind protocol version 2 to contact the
* local rpcbind daemon.
*
* Registration works over both AF_INET and AF_INET6, and services
* registered via this function are advertised as available for any
* address. If the local rpcbind daemon is listening on AF_INET6,
* services registered via this function will be advertised on
* IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
* addresses).
*/
int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
{
@ -230,6 +262,144 @@ int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
RPCBVERS_2, &msg, okay);
}
/*
* Fill in AF_INET family-specific arguments to register
*/
static int rpcb_register_netid4(struct sockaddr_in *address_to_register,
struct rpc_message *msg)
{
struct rpcbind_args *map = msg->rpc_argp;
unsigned short port = ntohs(address_to_register->sin_port);
char buf[32];
/* Construct AF_INET universal address */
snprintf(buf, sizeof(buf),
NIPQUAD_FMT".%u.%u",
NIPQUAD(address_to_register->sin_addr.s_addr),
port >> 8, port & 0xff);
map->r_addr = buf;
dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
"local rpcbind\n", (port ? "" : "un"),
map->r_prog, map->r_vers,
map->r_addr, map->r_netid);
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
if (port)
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
sizeof(rpcb_inaddr_loopback),
RPCBVERS_4, msg, msg->rpc_resp);
}
/*
* Fill in AF_INET6 family-specific arguments to register
*/
static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register,
struct rpc_message *msg)
{
struct rpcbind_args *map = msg->rpc_argp;
unsigned short port = ntohs(address_to_register->sin6_port);
char buf[64];
/* Construct AF_INET6 universal address */
snprintf(buf, sizeof(buf),
NIP6_FMT".%u.%u",
NIP6(address_to_register->sin6_addr),
port >> 8, port & 0xff);
map->r_addr = buf;
dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
"local rpcbind\n", (port ? "" : "un"),
map->r_prog, map->r_vers,
map->r_addr, map->r_netid);
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
if (port)
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback,
sizeof(rpcb_in6addr_loopback),
RPCBVERS_4, msg, msg->rpc_resp);
}
/**
* rpcb_v4_register - set or unset a port registration with the local rpcbind
* @program: RPC program number of service to (un)register
* @version: RPC version number of service to (un)register
* @address: address family, IP address, and port to (un)register
* @netid: netid of transport protocol to (un)register
* @result: result code from rpcbind RPC call
*
* RPC services invoke this function to advertise their contact
* information via the system's rpcbind daemon. RPC services
* invoke this function once for each [program, version, address,
* netid] tuple they wish to advertise.
*
* Callers may also unregister RPC services that are no longer
* available by setting the port number in the passed-in address
* to zero. Callers pass a netid of "" to unregister all
* transport netids associated with [program, version, address].
*
* Returns zero if the registration request was dispatched
* successfully and a reply was received. The rpcbind daemon's
* result code is stored in *result.
*
* Returns an errno value and sets *result to zero if there was
* some problem that prevented the rpcbind request from being
* dispatched, or if the rpcbind daemon did not respond within
* the timeout.
*
* This function uses rpcbind protocol version 4 to contact the
* local rpcbind daemon. The local rpcbind daemon must support
* version 4 of the rpcbind protocol in order for these functions
* to register a service successfully.
*
* Supported netids include "udp" and "tcp" for UDP and TCP over
* IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
* respectively.
*
* The contents of @address determine the address family and the
* port to be registered. The usual practice is to pass INADDR_ANY
* as the raw address, but specifying a non-zero address is also
* supported by this API if the caller wishes to advertise an RPC
* service on a specific network interface.
*
* Note that passing in INADDR_ANY does not create the same service
* registration as IN6ADDR_ANY. The former advertises an RPC
* service on any IPv4 address, but not on IPv6. The latter
* advertises the service on all IPv4 and IPv6 addresses.
*/
int rpcb_v4_register(const u32 program, const u32 version,
const struct sockaddr *address, const char *netid,
int *result)
{
struct rpcbind_args map = {
.r_prog = program,
.r_vers = version,
.r_netid = netid,
.r_owner = RPCB_OWNER_STRING,
};
struct rpc_message msg = {
.rpc_argp = &map,
.rpc_resp = result,
};
*result = 0;
switch (address->sa_family) {
case AF_INET:
return rpcb_register_netid4((struct sockaddr_in *)address,
&msg);
case AF_INET6:
return rpcb_register_netid6((struct sockaddr_in6 *)address,
&msg);
}
return -EAFNOSUPPORT;
}
/**
* rpcb_getport_sync - obtain the port for an RPC service on a given host
* @sin: address of remote peer