| /* |
| * 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/types.h> |
| #include <linux/socket.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/sched.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_netid |
| * |
| * Quoting RFC 3530, section 2.2: |
| * |
| * For TCP over IPv4 the value of r_netid is the string "tcp". For UDP |
| * over IPv4 the value of r_netid is the string "udp". |
| * |
| * ... |
| * |
| * For TCP over IPv6 the value of r_netid is the string "tcp6". For UDP |
| * over IPv6 the value of r_netid is the string "udp6". |
| */ |
| #define RPCB_NETID_UDP "\165\144\160" /* "udp" */ |
| #define RPCB_NETID_TCP "\164\143\160" /* "tcp" */ |
| #define RPCB_NETID_UDP6 "\165\144\160\066" /* "udp6" */ |
| #define RPCB_NETID_TCP6 "\164\143\160\066" /* "tcp6" */ |
| |
| #define RPCB_MAXNETIDLEN (4u) |
| |
| /* |
| * 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 *); |
| extern 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[]; |
| |
| static struct rpcb_info { |
| int rpc_vers; |
| struct rpc_procinfo * rpc_proc; |
| } rpcb_next_version[]; |
| |
| 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), |
| }; |
| |
| ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); |
| 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, |
| IPPROTO_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; |
| } |
| |
| #ifdef CONFIG_ROOT_NFS |
| /** |
| * rpcb_getport_external - 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. |
| * |
| * For now, this supports only version 2 queries, but is used only by |
| * mount_clnt for NFS_ROOT. |
| */ |
| int rpcb_getport_external(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_message msg = { |
| .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], |
| .rpc_argp = &map, |
| .rpc_resp = &map.r_port, |
| }; |
| struct rpc_clnt *rpcb_clnt; |
| char hostname[40]; |
| int status; |
| |
| dprintk("RPC: rpcb_getport_external(%u.%u.%u.%u, %u, %u, %d)\n", |
| NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); |
| |
| sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr)); |
| rpcb_clnt = rpcb_create(hostname, (struct sockaddr *)sin, prot, 2, 0); |
| if (IS_ERR(rpcb_clnt)) |
| return PTR_ERR(rpcb_clnt); |
| |
| status = rpc_call_sync(rpcb_clnt, &msg, 0); |
| rpc_shutdown_client(rpcb_clnt); |
| |
| if (status >= 0) { |
| if (map.r_port != 0) |
| return map.r_port; |
| status = -EACCES; |
| } |
| return status; |
| } |
| #endif |
| |
| /** |
| * rpcb_getport - obtain the port for a given RPC service on a given host |
| * @task: task that is waiting for portmapper request |
| * |
| * This one can be called for an ongoing RPC request, and can be used in |
| * an async (rpciod) context. |
| */ |
| void rpcb_getport(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| int bind_version; |
| struct rpc_xprt *xprt = task->tk_xprt; |
| struct rpc_clnt *rpcb_clnt; |
| static struct rpcbind_args *map; |
| struct rpc_task *child; |
| struct sockaddr addr; |
| int status; |
| |
| dprintk("RPC: %5u rpcb_getport(%s, %u, %u, %d)\n", |
| task->tk_pid, clnt->cl_server, |
| clnt->cl_prog, clnt->cl_vers, xprt->prot); |
| |
| /* Autobind on cloned rpc clients is discouraged */ |
| BUG_ON(clnt->cl_parent != clnt); |
| |
| if (xprt_test_and_set_binding(xprt)) { |
| status = -EACCES; /* tell caller to check again */ |
| dprintk("RPC: %5u rpcb_getport waiting for another binder\n", |
| task->tk_pid); |
| goto bailout_nowake; |
| } |
| |
| /* 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 rpcb_getport already bound\n", task->tk_pid); |
| goto bailout_nofree; |
| } |
| |
| if (rpcb_next_version[xprt->bind_index].rpc_proc == NULL) { |
| xprt->bind_index = 0; |
| status = -EACCES; /* tell caller to try again later */ |
| dprintk("RPC: %5u rpcb_getport no more getport versions " |
| "available\n", task->tk_pid); |
| goto bailout_nofree; |
| } |
| bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; |
| |
| dprintk("RPC: %5u rpcb_getport trying rpcbind version %u\n", |
| task->tk_pid, bind_version); |
| |
| map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); |
| if (!map) { |
| status = -ENOMEM; |
| dprintk("RPC: %5u rpcb_getport no memory available\n", |
| task->tk_pid); |
| goto bailout_nofree; |
| } |
| 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 = (xprt->prot == IPPROTO_TCP) ? RPCB_NETID_TCP : |
| RPCB_NETID_UDP; |
| memcpy(&map->r_addr, rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR), |
| sizeof(map->r_addr)); |
| map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ |
| |
| rpc_peeraddr(clnt, (void *)&addr, sizeof(addr)); |
| rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot, bind_version, 0); |
| if (IS_ERR(rpcb_clnt)) { |
| status = PTR_ERR(rpcb_clnt); |
| dprintk("RPC: %5u rpcb_getport rpcb_create failed, error %ld\n", |
| task->tk_pid, PTR_ERR(rpcb_clnt)); |
| goto bailout; |
| } |
| |
| child = rpc_run_task(rpcb_clnt, RPC_TASK_ASYNC, &rpcb_getport_ops, map); |
| rpc_release_client(rpcb_clnt); |
| if (IS_ERR(child)) { |
| status = -EIO; |
| dprintk("RPC: %5u rpcb_getport rpc_run_task failed\n", |
| task->tk_pid); |
| goto bailout_nofree; |
| } |
| rpc_put_task(child); |
| |
| task->tk_xprt->stat.bind_count++; |
| return; |
| |
| bailout: |
| kfree(map); |
| xprt_put(xprt); |
| bailout_nofree: |
| rpcb_wake_rpcbind_waiters(xprt, status); |
| bailout_nowake: |
| task->tk_status = status; |
| } |
| |
| /* |
| * Rpcbind child task calls this callback via tk_exit. |
| */ |
| static void rpcb_getport_done(struct rpc_task *child, void *data) |
| { |
| struct rpcbind_args *map = data; |
| struct rpc_xprt *xprt = map->r_xprt; |
| int status = child->tk_status; |
| |
| /* rpcbind server doesn't support this rpcbind protocol version */ |
| if (status == -EPROTONOSUPPORT) |
| xprt->bind_index++; |
| |
| if (status < 0) { |
| /* rpcbind server not available on remote host? */ |
| xprt->ops->set_port(xprt, 0); |
| } else if (map->r_port == 0) { |
| /* Requested RPC service wasn't registered on remote host */ |
| xprt->ops->set_port(xprt, 0); |
| status = -EACCES; |
| } else { |
| /* Succeeded */ |
| xprt->ops->set_port(xprt, map->r_port); |
| xprt_set_bound(xprt); |
| status = 0; |
| } |
| |
| dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", |
| child->tk_pid, status, map->r_port); |
| |
| rpcb_wake_rpcbind_waiters(xprt, status); |
| } |
| |
| static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, |
| struct rpcbind_args *rpcb) |
| { |
| dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n", |
| rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); |
| *p++ = htonl(rpcb->r_prog); |
| *p++ = htonl(rpcb->r_vers); |
| *p++ = htonl(rpcb->r_prot); |
| *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) |
| { |
| *portp = (unsigned short) ntohl(*p++); |
| dprintk("RPC: rpcb_decode_getport result %u\n", |
| *portp); |
| return 0; |
| } |
| |
| static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, |
| unsigned int *boolp) |
| { |
| *boolp = (unsigned int) ntohl(*p++); |
| dprintk("RPC: rpcb_decode_set result %u\n", |
| *boolp); |
| return 0; |
| } |
| |
| static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, |
| struct rpcbind_args *rpcb) |
| { |
| 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); |
| |
| p = xdr_encode_string(p, rpcb->r_netid); |
| p = xdr_encode_string(p, rpcb->r_addr); |
| p = xdr_encode_string(p, rpcb->r_owner); |
| |
| req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); |
| |
| return 0; |
| } |
| |
| static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, |
| unsigned short *portp) |
| { |
| char *addr; |
| int addr_len, c, i, f, first, val; |
| |
| *portp = 0; |
| addr_len = (unsigned int) ntohl(*p++); |
| if (addr_len > RPCB_MAXADDRLEN) /* sanity */ |
| return -EINVAL; |
| |
| dprintk("RPC: rpcb_decode_getaddr returned string: '%s'\n", |
| (char *) p); |
| |
| 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; |
| } |
| } |
| } |
| |
| dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); |
| return 0; |
| } |
| |
| #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) |
| |
| #define RPCB_netid_sz (1+XDR_QUADLEN(RPCB_MAXNETIDLEN)) |
| #define RPCB_addr_sz (1+XDR_QUADLEN(RPCB_MAXADDRLEN)) |
| #define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) |
| |
| #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_setres_sz RPCB_boolean_sz |
| #define RPCB_getportres_sz RPCB_port_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 |
| |
| #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, \ |
| } |
| |
| /* |
| * 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), |
| }; |
| |
| static struct rpc_procinfo rpcb_procedures3[] = { |
| PROC(SET, mapping, set), |
| PROC(UNSET, mapping, set), |
| PROC(GETADDR, getaddr, getaddr), |
| }; |
| |
| static struct rpc_procinfo rpcb_procedures4[] = { |
| PROC(SET, mapping, set), |
| PROC(UNSET, mapping, set), |
| PROC(GETVERSADDR, getaddr, 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 }, |
| }; |
| |
| static struct rpc_version rpcb_version2 = { |
| .number = 2, |
| .nrprocs = RPCB_HIGHPROC_2, |
| .procs = rpcb_procedures2 |
| }; |
| |
| static struct rpc_version rpcb_version3 = { |
| .number = 3, |
| .nrprocs = RPCB_HIGHPROC_3, |
| .procs = rpcb_procedures3 |
| }; |
| |
| static struct rpc_version rpcb_version4 = { |
| .number = 4, |
| .nrprocs = RPCB_HIGHPROC_4, |
| .procs = rpcb_procedures4 |
| }; |
| |
| static struct rpc_version *rpcb_version[] = { |
| NULL, |
| NULL, |
| &rpcb_version2, |
| &rpcb_version3, |
| &rpcb_version4 |
| }; |
| |
| static struct rpc_stat rpcb_stats; |
| |
| struct rpc_program rpcb_program = { |
| .name = "rpcbind", |
| .number = RPCBIND_PROGRAM, |
| .nrvers = ARRAY_SIZE(rpcb_version), |
| .version = rpcb_version, |
| .stats = &rpcb_stats, |
| }; |