X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fsunrpc%2Frpcb_clnt.c;h=3e3772d8eb921ce00af629ad11627ad3677ea613;hb=012da158f636347c4eb28fd1e1cca020fef5e54d;hp=7c362e5f6e1b35d63e4e745b5434c185d1f24de2;hpb=c970aa85e71bd581726c42df843f6f129db275ac;p=safe%2Fjmp%2Flinux-2.6 diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c index 7c362e5..3e3772d 100644 --- a/net/sunrpc/rpcb_clnt.c +++ b/net/sunrpc/rpcb_clnt.c @@ -20,6 +20,8 @@ #include #include #include +#include +#include #include #include @@ -32,6 +34,10 @@ #define RPCBIND_PROGRAM (100000u) #define RPCBIND_PORT (111u) +#define RPCBVERS_2 (2u) +#define RPCBVERS_3 (3u) +#define RPCBVERS_4 (4u) + enum { RPCBPROC_NULL, RPCBPROC_SET, @@ -55,56 +61,59 @@ enum { #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: + * r_owner * - * x1:x2:x3:x4:x5:x6:x7:x8.p1.p2 + * The "owner" is allowed to unset a service in the rpcbind database. * - * 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. + * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a + * UID which it maps to a local user name via a password lookup. + * In all other cases it is ignored. * - * XXX: Currently this implementation does not explicitly convert the - * stored address to US-ASCII on non-ASCII systems. + * For SET/UNSET requests, user space provides a value, even for + * network requests, and GETADDR uses an empty string. We follow + * those precedents here. */ -#define RPCB_MAXADDRLEN (128u) +#define RPCB_OWNER_STRING "0" +#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) /* - * r_owner - * - * The "owner" is allowed to unset a service in the rpcbind database. - * We always use the following (arbitrary) fixed string. + * XDR data type sizes */ -#define RPCB_OWNER_STRING "rpcb" -#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) +#define RPCB_program_sz (1) +#define RPCB_version_sz (1) +#define RPCB_protocol_sz (1) +#define RPCB_port_sz (1) +#define RPCB_boolean_sz (1) + +#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) +#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) +#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN)) + +/* + * XDR argument and result sizes + */ +#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \ + RPCB_protocol_sz + RPCB_port_sz) +#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \ + RPCB_netid_sz + RPCB_addr_sz + \ + RPCB_ownerstring_sz) + +#define RPCB_getportres_sz RPCB_port_sz +#define RPCB_setres_sz RPCB_boolean_sz + +/* + * Note that RFC 1833 does not put any size restrictions on the + * address string returned by the remote rpcbind database. + */ +#define RPCB_getaddrres_sz RPCB_addr_sz static void rpcb_getport_done(struct rpc_task *, void *); +static void rpcb_map_release(void *data); static struct rpc_program rpcb_program; +static struct rpc_clnt * rpcb_local_clnt; +static struct rpc_clnt * rpcb_local_clnt4; + struct rpcbind_args { struct rpc_xprt * r_xprt; @@ -112,68 +121,121 @@ struct rpcbind_args { u32 r_vers; u32 r_prot; unsigned short r_port; - char * r_netid; - char r_addr[RPCB_MAXADDRLEN]; - char * r_owner; + const char * r_netid; + const char * r_addr; + const char * r_owner; + + int r_status; }; static struct rpc_procinfo rpcb_procedures2[]; static struct rpc_procinfo rpcb_procedures3[]; +static struct rpc_procinfo rpcb_procedures4[]; struct rpcb_info { - int rpc_vers; + u32 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, - }; +static const struct rpc_call_ops rpcb_getport_ops = { + .rpc_call_done = rpcb_getport_done, + .rpc_release = rpcb_map_release, +}; - rpc_call_setup(task, &msg, 0); +static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) +{ + xprt_clear_binding(xprt); + rpc_wake_up_status(&xprt->binding, status); } static void rpcb_map_release(void *data) { struct rpcbind_args *map = data; + rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); xprt_put(map->r_xprt); + kfree(map->r_addr); 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 const struct sockaddr_in rpcb_inaddr_loopback = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_LOOPBACK), + .sin_port = htons(RPCBIND_PORT), }; -static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) +static DEFINE_MUTEX(rpcb_create_local_mutex); + +/* + * Returns zero on success, otherwise a negative errno value + * is returned. + */ +static int rpcb_create_local(void) { - xprt_clear_binding(xprt); - rpc_wake_up_status(&xprt->binding, status); + struct rpc_create_args args = { + .protocol = XPRT_TRANSPORT_TCP, + .address = (struct sockaddr *)&rpcb_inaddr_loopback, + .addrsize = sizeof(rpcb_inaddr_loopback), + .servername = "localhost", + .program = &rpcb_program, + .version = RPCBVERS_2, + .authflavor = RPC_AUTH_UNIX, + .flags = RPC_CLNT_CREATE_NOPING, + }; + struct rpc_clnt *clnt, *clnt4; + int result = 0; + + if (rpcb_local_clnt) + return result; + + mutex_lock(&rpcb_create_local_mutex); + if (rpcb_local_clnt) + goto out; + + clnt = rpc_create(&args); + if (IS_ERR(clnt)) { + dprintk("RPC: failed to create local rpcbind " + "client (errno %ld).\n", PTR_ERR(clnt)); + result = -PTR_ERR(clnt); + goto out; + } + + /* + * This results in an RPC ping. On systems running portmapper, + * the v4 ping will fail. Proceed anyway, but disallow rpcb + * v4 upcalls. + */ + clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4); + if (IS_ERR(clnt4)) { + dprintk("RPC: failed to create local rpcbind v4 " + "cleint (errno %ld).\n", PTR_ERR(clnt4)); + clnt4 = NULL; + } + + rpcb_local_clnt = clnt; + rpcb_local_clnt4 = clnt4; + +out: + mutex_unlock(&rpcb_create_local_mutex); + return result; } static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, - int proto, int version, int privileged) + size_t salen, int proto, u32 version) { struct rpc_create_args args = { .protocol = proto, .address = srvaddr, - .addrsize = sizeof(struct sockaddr_in), + .addrsize = salen, .servername = hostname, .program = &rpcb_program, .version = version, .authflavor = RPC_AUTH_UNIX, .flags = (RPC_CLNT_CREATE_NOPING | - RPC_CLNT_CREATE_INTR), + RPC_CLNT_CREATE_NONPRIVPORT), }; switch (srvaddr->sa_family) { @@ -187,29 +249,61 @@ static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, return NULL; } - if (!privileged) - args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; return rpc_create(&args); } +static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg) +{ + int result, error = 0; + + msg->rpc_resp = &result; + + error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN); + if (error < 0) { + dprintk("RPC: failed to contact local rpcbind " + "server (errno %d).\n", -error); + return error; + } + + if (!result) + return -EACCES; + return 0; +} + /** * 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 * - * port == 0 means unregister, port != 0 means register. + * Returns zero if the registration request was dispatched successfully + * and the rpcbind daemon returned success. Otherwise, returns an errno + * value that reflects the nature of the error (request could not be + * dispatched, timed out, or rpcbind returned an error). + * + * 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. + * + * 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) +int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) { - 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, @@ -217,32 +311,167 @@ int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) .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; + int error; + + error = rpcb_create_local(); + if (error) + return error; 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); + msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; + if (port) + msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; - error = rpc_call_sync(rpcb_clnt, &msg, 0); + return rpcb_register_call(rpcb_local_clnt, &msg); +} - 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); +/* + * Fill in AF_INET family-specific arguments to register + */ +static int rpcb_register_inet4(const struct sockaddr *sap, + struct rpc_message *msg) +{ + const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; + struct rpcbind_args *map = msg->rpc_argp; + unsigned short port = ntohs(sin->sin_port); + int result; + + map->r_addr = rpc_sockaddr2uaddr(sap); - return error; + 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]; + + result = rpcb_register_call(rpcb_local_clnt4, msg); + kfree(map->r_addr); + return result; +} + +/* + * Fill in AF_INET6 family-specific arguments to register + */ +static int rpcb_register_inet6(const struct sockaddr *sap, + struct rpc_message *msg) +{ + const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; + struct rpcbind_args *map = msg->rpc_argp; + unsigned short port = ntohs(sin6->sin6_port); + int result; + + map->r_addr = rpc_sockaddr2uaddr(sap); + + 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]; + + result = rpcb_register_call(rpcb_local_clnt4, msg); + kfree(map->r_addr); + return result; +} + +static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) +{ + struct rpcbind_args *map = msg->rpc_argp; + + dprintk("RPC: unregistering [%u, %u, '%s'] with " + "local rpcbind\n", + map->r_prog, map->r_vers, map->r_netid); + + map->r_addr = ""; + msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; + + return rpcb_register_call(rpcb_local_clnt4, msg); +} + +/** + * 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 + * + * Returns zero if the registration request was dispatched successfully + * and the rpcbind daemon returned success. Otherwise, returns an errno + * value that reflects the nature of the error (request could not be + * dispatched, timed out, or rpcbind returned an error). + * + * 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 registered at a + * specific address by setting the port number in @address to zero. + * They may unregister all registered protocol families at once for + * a service by passing a NULL @address argument. If @netid is "" + * then all netids for [program, version, address] are unregistered. + * + * 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) +{ + 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, + }; + int error; + + error = rpcb_create_local(); + if (error) + return error; + if (rpcb_local_clnt4 == NULL) + return -EPROTONOSUPPORT; + + if (address == NULL) + return rpcb_unregister_all_protofamilies(&msg); + + switch (address->sa_family) { + case AF_INET: + return rpcb_register_inet4(address, &msg); + case AF_INET6: + return rpcb_register_inet6(address, &msg); + } + + return -EAFNOSUPPORT; } /** @@ -252,13 +481,15 @@ int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) * @vers: RPC version number to bind * @prot: transport protocol to use to make this request * + * Return value is the requested advertised port number, + * or a negative errno value. + * * 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 + * XXX: Needs to support IPv6 */ -int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog, - __u32 vers, int prot) +int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) { struct rpcbind_args map = { .r_prog = prog, @@ -269,17 +500,16 @@ int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog, struct rpc_message msg = { .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], .rpc_argp = &map, - .rpc_resp = &map.r_port, + .rpc_resp = &map, }; struct rpc_clnt *rpcb_clnt; - char hostname[40]; int status; - dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n", - __FUNCTION__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); + dprintk("RPC: %s(%pI4, %u, %u, %d)\n", + __func__, &sin->sin_addr.s_addr, prog, vers, prot); - sprintf(hostname, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); - rpcb_clnt = rpcb_create(hostname, (struct sockaddr *)sin, prot, 2, 0); + rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, + sizeof(*sin), prot, RPCBVERS_2); if (IS_ERR(rpcb_clnt)) return PTR_ERR(rpcb_clnt); @@ -295,6 +525,46 @@ int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog, } EXPORT_SYMBOL_GPL(rpcb_getport_sync); +static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) +{ + struct rpc_message msg = { + .rpc_proc = proc, + .rpc_argp = map, + .rpc_resp = map, + }; + struct rpc_task_setup task_setup_data = { + .rpc_client = rpcb_clnt, + .rpc_message = &msg, + .callback_ops = &rpcb_getport_ops, + .callback_data = map, + .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN, + }; + + return rpc_run_task(&task_setup_data); +} + +/* + * In the case where rpc clients have been cloned, we want to make + * sure that we use the program number/version etc of the actual + * owner of the xprt. To do so, we walk back up the tree of parents + * to find whoever created the transport and/or whoever has the + * autobind flag set. + */ +static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) +{ + struct rpc_clnt *parent = clnt->cl_parent; + + while (parent != clnt) { + if (parent->cl_xprt != clnt->cl_xprt) + break; + if (clnt->cl_autobind) + break; + clnt = parent; + parent = parent->cl_parent; + } + return clnt; +} + /** * rpcb_getport_async - obtain the port for a given RPC service on a given host * @task: task that is waiting for portmapper request @@ -304,80 +574,79 @@ EXPORT_SYMBOL_GPL(rpcb_getport_sync); */ void rpcb_getport_async(struct rpc_task *task) { - struct rpc_clnt *clnt = task->tk_client; - int bind_version; - struct rpc_xprt *xprt = task->tk_xprt; + struct rpc_clnt *clnt; + struct rpc_procinfo *proc; + u32 bind_version; + struct rpc_xprt *xprt; struct rpc_clnt *rpcb_clnt; static struct rpcbind_args *map; struct rpc_task *child; - struct rpc_task_setup task_setup_data = { - .callback_ops = &rpcb_getport_ops, - .flags = RPC_TASK_ASYNC, - }; - struct sockaddr addr; + struct sockaddr_storage addr; + struct sockaddr *sap = (struct sockaddr *)&addr; + size_t salen; int status; - struct rpcb_info *info; + + clnt = rpcb_find_transport_owner(task->tk_client); + xprt = clnt->cl_xprt; dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", - task->tk_pid, __FUNCTION__, + task->tk_pid, __func__, clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); - /* Autobind on cloned rpc clients is discouraged */ - BUG_ON(clnt->cl_parent != clnt); + /* Put self on the wait queue to ensure we get notified if + * some other task is already attempting to bind the port */ + rpc_sleep_on(&xprt->binding, task, NULL); if (xprt_test_and_set_binding(xprt)) { - status = -EAGAIN; /* tell caller to check again */ dprintk("RPC: %5u %s: waiting for another binder\n", - task->tk_pid, __FUNCTION__); - goto bailout_nowake; + task->tk_pid, __func__); + return; } - /* Put self on queue before sending rpcbind request, in case - * rpcb_getport_done completes before we return from rpc_run_task */ - rpc_sleep_on(&xprt->binding, task, NULL, NULL); - /* Someone else may have bound if we slept */ if (xprt_bound(xprt)) { status = 0; dprintk("RPC: %5u %s: already bound\n", - task->tk_pid, __FUNCTION__); + task->tk_pid, __func__); goto bailout_nofree; } - rpc_peeraddr(clnt, (void *)&addr, sizeof(addr)); + /* Parent transport's destination address */ + salen = rpc_peeraddr(clnt, sap, sizeof(addr)); /* Don't ever use rpcbind v2 for AF_INET6 requests */ - switch (addr.sa_family) { + switch (sap->sa_family) { case AF_INET: - info = rpcb_next_version; + proc = rpcb_next_version[xprt->bind_index].rpc_proc; + bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; break; case AF_INET6: - info = rpcb_next_version6; + proc = rpcb_next_version6[xprt->bind_index].rpc_proc; + bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; break; default: status = -EAFNOSUPPORT; dprintk("RPC: %5u %s: bad address family\n", - task->tk_pid, __FUNCTION__); + task->tk_pid, __func__); goto bailout_nofree; } - if (info[xprt->bind_index].rpc_proc == NULL) { + if (proc == NULL) { xprt->bind_index = 0; status = -EPFNOSUPPORT; dprintk("RPC: %5u %s: no more getport versions available\n", - task->tk_pid, __FUNCTION__); + task->tk_pid, __func__); goto bailout_nofree; } - bind_version = info[xprt->bind_index].rpc_vers; dprintk("RPC: %5u %s: trying rpcbind version %u\n", - task->tk_pid, __FUNCTION__, bind_version); + task->tk_pid, __func__, bind_version); - rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot, - bind_version, 0); + rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, + bind_version); if (IS_ERR(rpcb_clnt)) { status = PTR_ERR(rpcb_clnt); dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", - task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt)); + task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); goto bailout_nofree; } @@ -385,41 +654,47 @@ void rpcb_getport_async(struct rpc_task *task) if (!map) { status = -ENOMEM; dprintk("RPC: %5u %s: no memory available\n", - task->tk_pid, __FUNCTION__); - goto bailout_nofree; + task->tk_pid, __func__); + goto bailout_release_client; } map->r_prog = clnt->cl_prog; map->r_vers = clnt->cl_vers; map->r_prot = xprt->prot; map->r_port = 0; map->r_xprt = xprt_get(xprt); - map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); - memcpy(map->r_addr, - rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR), - sizeof(map->r_addr)); - map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ - - task_setup_data.rpc_client = rpcb_clnt; - task_setup_data.callback_data = map; - child = rpc_run_task(&task_setup_data); + map->r_status = -EIO; + + switch (bind_version) { + case RPCBVERS_4: + case RPCBVERS_3: + map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); + map->r_addr = rpc_sockaddr2uaddr(sap); + map->r_owner = ""; + break; + case RPCBVERS_2: + map->r_addr = NULL; + break; + default: + BUG(); + } + + child = rpcb_call_async(rpcb_clnt, map, proc); rpc_release_client(rpcb_clnt); if (IS_ERR(child)) { - status = -EIO; + /* rpcb_map_release() has freed the arguments */ dprintk("RPC: %5u %s: rpc_run_task failed\n", - task->tk_pid, __FUNCTION__); - goto bailout; + task->tk_pid, __func__); + return; } - rpc_put_task(child); - task->tk_xprt->stat.bind_count++; + xprt->stat.bind_count++; + rpc_put_task(child); return; -bailout: - kfree(map); - xprt_put(xprt); +bailout_release_client: + rpc_release_client(rpcb_clnt); bailout_nofree: rpcb_wake_rpcbind_waiters(xprt, status); -bailout_nowake: task->tk_status = status; } EXPORT_SYMBOL_GPL(rpcb_getport_async); @@ -458,206 +733,325 @@ static void rpcb_getport_done(struct rpc_task *child, void *data) dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", child->tk_pid, status, map->r_port); - rpcb_wake_rpcbind_waiters(xprt, status); + map->r_status = status; } -static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, - struct rpcbind_args *rpcb) +/* + * XDR functions for rpcbind + */ + +static int rpcb_enc_mapping(struct rpc_rqst *req, __be32 *p, + const struct rpcbind_args *rpcb) { - dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n", + struct rpc_task *task = req->rq_task; + struct xdr_stream xdr; + + dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n", + task->tk_pid, task->tk_msg.rpc_proc->p_name, rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); + + xdr_init_encode(&xdr, &req->rq_snd_buf, p); + + p = xdr_reserve_space(&xdr, sizeof(__be32) * RPCB_mappingargs_sz); + if (unlikely(p == NULL)) + return -EIO; + *p++ = htonl(rpcb->r_prog); *p++ = htonl(rpcb->r_vers); *p++ = htonl(rpcb->r_prot); - *p++ = htonl(rpcb->r_port); + *p = htonl(rpcb->r_port); - req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } -static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, - unsigned short *portp) +static int rpcb_dec_getport(struct rpc_rqst *req, __be32 *p, + struct rpcbind_args *rpcb) { - *portp = (unsigned short) ntohl(*p++); - dprintk("RPC: rpcb_decode_getport result %u\n", - *portp); + struct rpc_task *task = req->rq_task; + struct xdr_stream xdr; + unsigned long port; + + xdr_init_decode(&xdr, &req->rq_rcv_buf, p); + + rpcb->r_port = 0; + + p = xdr_inline_decode(&xdr, sizeof(__be32)); + if (unlikely(p == NULL)) + return -EIO; + + port = ntohl(*p); + dprintk("RPC: %5u PMAP_%s result: %lu\n", task->tk_pid, + task->tk_msg.rpc_proc->p_name, port); + if (unlikely(port > USHORT_MAX)) + return -EIO; + + rpcb->r_port = port; return 0; } -static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, - unsigned int *boolp) +static int rpcb_dec_set(struct rpc_rqst *req, __be32 *p, + unsigned int *boolp) { - *boolp = (unsigned int) ntohl(*p++); - dprintk("RPC: rpcb_decode_set result %u\n", - *boolp); + struct rpc_task *task = req->rq_task; + struct xdr_stream xdr; + + xdr_init_decode(&xdr, &req->rq_rcv_buf, p); + + p = xdr_inline_decode(&xdr, sizeof(__be32)); + if (unlikely(p == NULL)) + return -EIO; + + *boolp = 0; + if (*p) + *boolp = 1; + + dprintk("RPC: %5u RPCB_%s call %s\n", + task->tk_pid, task->tk_msg.rpc_proc->p_name, + (*boolp ? "succeeded" : "failed")); return 0; } -static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, - struct rpcbind_args *rpcb) +static int encode_rpcb_string(struct xdr_stream *xdr, const char *string, + const u32 maxstrlen) { - dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n", - rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); - *p++ = htonl(rpcb->r_prog); - *p++ = htonl(rpcb->r_vers); + u32 len; + __be32 *p; - p = xdr_encode_string(p, rpcb->r_netid); - p = xdr_encode_string(p, rpcb->r_addr); - p = xdr_encode_string(p, rpcb->r_owner); + if (unlikely(string == NULL)) + return -EIO; + len = strlen(string); + if (unlikely(len > maxstrlen)) + return -EIO; - req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); + p = xdr_reserve_space(xdr, sizeof(__be32) + len); + if (unlikely(p == NULL)) + return -EIO; + xdr_encode_opaque(p, string, len); return 0; } -static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, - unsigned short *portp) +static int rpcb_enc_getaddr(struct rpc_rqst *req, __be32 *p, + const struct rpcbind_args *rpcb) { - char *addr; - u32 addr_len; - int c, i, f, first, val; + struct rpc_task *task = req->rq_task; + struct xdr_stream xdr; - *portp = 0; - addr_len = ntohl(*p++); + dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n", + task->tk_pid, task->tk_msg.rpc_proc->p_name, + rpcb->r_prog, rpcb->r_vers, + rpcb->r_netid, rpcb->r_addr); - /* - * Simple sanity check. The smallest possible universal - * address is an IPv4 address string containing 11 bytes. - */ - if (addr_len < 11 || addr_len > RPCB_MAXADDRLEN) - goto out_err; + xdr_init_encode(&xdr, &req->rq_snd_buf, p); - /* - * Start at the end and walk backwards until the first dot - * is encountered. When the second dot is found, we have - * both parts of the port number. - */ - addr = (char *)p; - val = 0; - first = 1; - f = 1; - for (i = addr_len - 1; i > 0; i--) { - c = addr[i]; - if (c >= '0' && c <= '9') { - val += (c - '0') * f; - f *= 10; - } else if (c == '.') { - if (first) { - *portp = val; - val = first = 0; - f = 1; - } else { - *portp |= (val << 8); - break; - } - } - } + p = xdr_reserve_space(&xdr, + sizeof(__be32) * (RPCB_program_sz + RPCB_version_sz)); + if (unlikely(p == NULL)) + return -EIO; + *p++ = htonl(rpcb->r_prog); + *p = htonl(rpcb->r_vers); - /* - * Simple sanity check. If we never saw a dot in the reply, - * then this was probably just garbage. - */ - if (first) - goto out_err; + if (encode_rpcb_string(&xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN)) + return -EIO; + if (encode_rpcb_string(&xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN)) + return -EIO; + if (encode_rpcb_string(&xdr, rpcb->r_owner, RPCB_MAXOWNERLEN)) + return -EIO; - dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); return 0; - -out_err: - dprintk("RPC: rpcbind server returned malformed reply\n"); - return -EIO; } -#define RPCB_program_sz (1u) -#define RPCB_version_sz (1u) -#define RPCB_protocol_sz (1u) -#define RPCB_port_sz (1u) -#define RPCB_boolean_sz (1u) +static int rpcb_dec_getaddr(struct rpc_rqst *req, __be32 *p, + struct rpcbind_args *rpcb) +{ + struct sockaddr_storage address; + struct sockaddr *sap = (struct sockaddr *)&address; + struct rpc_task *task = req->rq_task; + struct xdr_stream xdr; + u32 len; -#define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) -#define RPCB_addr_sz (1+XDR_QUADLEN(RPCB_MAXADDRLEN)) -#define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) + rpcb->r_port = 0; -#define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \ - RPCB_protocol_sz+RPCB_port_sz -#define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \ - RPCB_netid_sz+RPCB_addr_sz+ \ - RPCB_ownerstring_sz + xdr_init_decode(&xdr, &req->rq_rcv_buf, p); -#define RPCB_setres_sz RPCB_boolean_sz -#define RPCB_getportres_sz RPCB_port_sz + p = xdr_inline_decode(&xdr, sizeof(__be32)); + if (unlikely(p == NULL)) + goto out_fail; + len = ntohl(*p); -/* - * Note that RFC 1833 does not put any size restrictions on the - * address string returned by the remote rpcbind database. - */ -#define RPCB_getaddrres_sz RPCB_addr_sz - -#define PROC(proc, argtype, restype) \ - [RPCBPROC_##proc] = { \ - .p_proc = RPCBPROC_##proc, \ - .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ - .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ - .p_arglen = RPCB_##argtype##args_sz, \ - .p_replen = RPCB_##restype##res_sz, \ - .p_statidx = RPCBPROC_##proc, \ - .p_timer = 0, \ - .p_name = #proc, \ + /* + * If the returned universal address is a null string, + * the requested RPC service was not registered. + */ + if (len == 0) { + dprintk("RPC: %5u RPCB reply: program not registered\n", + task->tk_pid); + return 0; } + if (unlikely(len > RPCBIND_MAXUADDRLEN)) + goto out_fail; + + p = xdr_inline_decode(&xdr, len); + if (unlikely(p == NULL)) + goto out_fail; + dprintk("RPC: %5u RPCB_%s reply: %s\n", task->tk_pid, + task->tk_msg.rpc_proc->p_name, (char *)p); + + if (rpc_uaddr2sockaddr((char *)p, len, sap, sizeof(address)) == 0) + goto out_fail; + rpcb->r_port = rpc_get_port(sap); + + return 0; + +out_fail: + dprintk("RPC: %5u malformed RPCB_%s reply\n", + task->tk_pid, task->tk_msg.rpc_proc->p_name); + return -EIO; +} + /* * Not all rpcbind procedures described in RFC 1833 are implemented * since the Linux kernel RPC code requires only these. */ + static struct rpc_procinfo rpcb_procedures2[] = { - PROC(SET, mapping, set), - PROC(UNSET, mapping, set), - PROC(GETADDR, mapping, getport), + [RPCBPROC_SET] = { + .p_proc = RPCBPROC_SET, + .p_encode = (kxdrproc_t)rpcb_enc_mapping, + .p_decode = (kxdrproc_t)rpcb_dec_set, + .p_arglen = RPCB_mappingargs_sz, + .p_replen = RPCB_setres_sz, + .p_statidx = RPCBPROC_SET, + .p_timer = 0, + .p_name = "SET", + }, + [RPCBPROC_UNSET] = { + .p_proc = RPCBPROC_UNSET, + .p_encode = (kxdrproc_t)rpcb_enc_mapping, + .p_decode = (kxdrproc_t)rpcb_dec_set, + .p_arglen = RPCB_mappingargs_sz, + .p_replen = RPCB_setres_sz, + .p_statidx = RPCBPROC_UNSET, + .p_timer = 0, + .p_name = "UNSET", + }, + [RPCBPROC_GETPORT] = { + .p_proc = RPCBPROC_GETPORT, + .p_encode = (kxdrproc_t)rpcb_enc_mapping, + .p_decode = (kxdrproc_t)rpcb_dec_getport, + .p_arglen = RPCB_mappingargs_sz, + .p_replen = RPCB_getportres_sz, + .p_statidx = RPCBPROC_GETPORT, + .p_timer = 0, + .p_name = "GETPORT", + }, }; static struct rpc_procinfo rpcb_procedures3[] = { - PROC(SET, mapping, set), - PROC(UNSET, mapping, set), - PROC(GETADDR, getaddr, getaddr), + [RPCBPROC_SET] = { + .p_proc = RPCBPROC_SET, + .p_encode = (kxdrproc_t)rpcb_enc_getaddr, + .p_decode = (kxdrproc_t)rpcb_dec_set, + .p_arglen = RPCB_getaddrargs_sz, + .p_replen = RPCB_setres_sz, + .p_statidx = RPCBPROC_SET, + .p_timer = 0, + .p_name = "SET", + }, + [RPCBPROC_UNSET] = { + .p_proc = RPCBPROC_UNSET, + .p_encode = (kxdrproc_t)rpcb_enc_getaddr, + .p_decode = (kxdrproc_t)rpcb_dec_set, + .p_arglen = RPCB_getaddrargs_sz, + .p_replen = RPCB_setres_sz, + .p_statidx = RPCBPROC_UNSET, + .p_timer = 0, + .p_name = "UNSET", + }, + [RPCBPROC_GETADDR] = { + .p_proc = RPCBPROC_GETADDR, + .p_encode = (kxdrproc_t)rpcb_enc_getaddr, + .p_decode = (kxdrproc_t)rpcb_dec_getaddr, + .p_arglen = RPCB_getaddrargs_sz, + .p_replen = RPCB_getaddrres_sz, + .p_statidx = RPCBPROC_GETADDR, + .p_timer = 0, + .p_name = "GETADDR", + }, }; static struct rpc_procinfo rpcb_procedures4[] = { - PROC(SET, mapping, set), - PROC(UNSET, mapping, set), - PROC(GETVERSADDR, getaddr, getaddr), + [RPCBPROC_SET] = { + .p_proc = RPCBPROC_SET, + .p_encode = (kxdrproc_t)rpcb_enc_getaddr, + .p_decode = (kxdrproc_t)rpcb_dec_set, + .p_arglen = RPCB_getaddrargs_sz, + .p_replen = RPCB_setres_sz, + .p_statidx = RPCBPROC_SET, + .p_timer = 0, + .p_name = "SET", + }, + [RPCBPROC_UNSET] = { + .p_proc = RPCBPROC_UNSET, + .p_encode = (kxdrproc_t)rpcb_enc_getaddr, + .p_decode = (kxdrproc_t)rpcb_dec_set, + .p_arglen = RPCB_getaddrargs_sz, + .p_replen = RPCB_setres_sz, + .p_statidx = RPCBPROC_UNSET, + .p_timer = 0, + .p_name = "UNSET", + }, + [RPCBPROC_GETADDR] = { + .p_proc = RPCBPROC_GETADDR, + .p_encode = (kxdrproc_t)rpcb_enc_getaddr, + .p_decode = (kxdrproc_t)rpcb_dec_getaddr, + .p_arglen = RPCB_getaddrargs_sz, + .p_replen = RPCB_getaddrres_sz, + .p_statidx = RPCBPROC_GETADDR, + .p_timer = 0, + .p_name = "GETADDR", + }, }; static struct rpcb_info rpcb_next_version[] = { -#ifdef CONFIG_SUNRPC_BIND34 - { 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] }, - { 3, &rpcb_procedures3[RPCBPROC_GETADDR] }, -#endif - { 2, &rpcb_procedures2[RPCBPROC_GETPORT] }, - { 0, NULL }, + { + .rpc_vers = RPCBVERS_2, + .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], + }, + { + .rpc_proc = NULL, + }, }; static struct rpcb_info rpcb_next_version6[] = { -#ifdef CONFIG_SUNRPC_BIND34 - { 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] }, - { 3, &rpcb_procedures3[RPCBPROC_GETADDR] }, -#endif - { 0, NULL }, + { + .rpc_vers = RPCBVERS_4, + .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], + }, + { + .rpc_vers = RPCBVERS_3, + .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], + }, + { + .rpc_proc = NULL, + }, }; static struct rpc_version rpcb_version2 = { - .number = 2, + .number = RPCBVERS_2, .nrprocs = RPCB_HIGHPROC_2, .procs = rpcb_procedures2 }; static struct rpc_version rpcb_version3 = { - .number = 3, + .number = RPCBVERS_3, .nrprocs = RPCB_HIGHPROC_3, .procs = rpcb_procedures3 }; static struct rpc_version rpcb_version4 = { - .number = 4, + .number = RPCBVERS_4, .nrprocs = RPCB_HIGHPROC_4, .procs = rpcb_procedures4 }; @@ -679,3 +1073,15 @@ static struct rpc_program rpcb_program = { .version = rpcb_version, .stats = &rpcb_stats, }; + +/** + * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister + * + */ +void cleanup_rpcb_clnt(void) +{ + if (rpcb_local_clnt4) + rpc_shutdown_client(rpcb_local_clnt4); + if (rpcb_local_clnt) + rpc_shutdown_client(rpcb_local_clnt); +}