| /* |
| * linux/net/sunrpc/clnt.c |
| * |
| * This file contains the high-level RPC interface. |
| * It is modeled as a finite state machine to support both synchronous |
| * and asynchronous requests. |
| * |
| * - RPC header generation and argument serialization. |
| * - Credential refresh. |
| * - TCP connect handling. |
| * - Retry of operation when it is suspected the operation failed because |
| * of uid squashing on the server, or when the credentials were stale |
| * and need to be refreshed, or when a packet was damaged in transit. |
| * This may be have to be moved to the VFS layer. |
| * |
| * NB: BSD uses a more intelligent approach to guessing when a request |
| * or reply has been lost by keeping the RTO estimate for each procedure. |
| * We currently make do with a constant timeout value. |
| * |
| * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
| * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> |
| */ |
| |
| #include <asm/system.h> |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <linux/utsname.h> |
| |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/workqueue.h> |
| #include <linux/sunrpc/rpc_pipe_fs.h> |
| |
| #include <linux/nfs.h> |
| |
| |
| #define RPC_SLACK_SPACE (1024) /* total overkill */ |
| |
| #ifdef RPC_DEBUG |
| # define RPCDBG_FACILITY RPCDBG_CALL |
| #endif |
| |
| static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
| |
| |
| static void call_start(struct rpc_task *task); |
| static void call_reserve(struct rpc_task *task); |
| static void call_reserveresult(struct rpc_task *task); |
| static void call_allocate(struct rpc_task *task); |
| static void call_encode(struct rpc_task *task); |
| static void call_decode(struct rpc_task *task); |
| static void call_bind(struct rpc_task *task); |
| static void call_bind_status(struct rpc_task *task); |
| static void call_transmit(struct rpc_task *task); |
| static void call_status(struct rpc_task *task); |
| static void call_transmit_status(struct rpc_task *task); |
| static void call_refresh(struct rpc_task *task); |
| static void call_refreshresult(struct rpc_task *task); |
| static void call_timeout(struct rpc_task *task); |
| static void call_connect(struct rpc_task *task); |
| static void call_connect_status(struct rpc_task *task); |
| static u32 * call_header(struct rpc_task *task); |
| static u32 * call_verify(struct rpc_task *task); |
| |
| |
| static int |
| rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) |
| { |
| static uint32_t clntid; |
| int error; |
| |
| if (dir_name == NULL) |
| return 0; |
| for (;;) { |
| snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), |
| "%s/clnt%x", dir_name, |
| (unsigned int)clntid++); |
| clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; |
| clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); |
| if (!IS_ERR(clnt->cl_dentry)) |
| return 0; |
| error = PTR_ERR(clnt->cl_dentry); |
| if (error != -EEXIST) { |
| printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", |
| clnt->cl_pathname, error); |
| return error; |
| } |
| } |
| } |
| |
| /* |
| * Create an RPC client |
| * FIXME: This should also take a flags argument (as in task->tk_flags). |
| * It's called (among others) from pmap_create_client, which may in |
| * turn be called by an async task. In this case, rpciod should not be |
| * made to sleep too long. |
| */ |
| struct rpc_clnt * |
| rpc_new_client(struct rpc_xprt *xprt, char *servname, |
| struct rpc_program *program, u32 vers, |
| rpc_authflavor_t flavor) |
| { |
| struct rpc_version *version; |
| struct rpc_clnt *clnt = NULL; |
| struct rpc_auth *auth; |
| int err; |
| int len; |
| |
| dprintk("RPC: creating %s client for %s (xprt %p)\n", |
| program->name, servname, xprt); |
| |
| err = -EINVAL; |
| if (!xprt) |
| goto out_err; |
| if (vers >= program->nrvers || !(version = program->version[vers])) |
| goto out_err; |
| |
| err = -ENOMEM; |
| clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL); |
| if (!clnt) |
| goto out_err; |
| memset(clnt, 0, sizeof(*clnt)); |
| atomic_set(&clnt->cl_users, 0); |
| atomic_set(&clnt->cl_count, 1); |
| clnt->cl_parent = clnt; |
| |
| clnt->cl_server = clnt->cl_inline_name; |
| len = strlen(servname) + 1; |
| if (len > sizeof(clnt->cl_inline_name)) { |
| char *buf = kmalloc(len, GFP_KERNEL); |
| if (buf != 0) |
| clnt->cl_server = buf; |
| else |
| len = sizeof(clnt->cl_inline_name); |
| } |
| strlcpy(clnt->cl_server, servname, len); |
| |
| clnt->cl_xprt = xprt; |
| clnt->cl_procinfo = version->procs; |
| clnt->cl_maxproc = version->nrprocs; |
| clnt->cl_protname = program->name; |
| clnt->cl_pmap = &clnt->cl_pmap_default; |
| clnt->cl_port = xprt->addr.sin_port; |
| clnt->cl_prog = program->number; |
| clnt->cl_vers = version->number; |
| clnt->cl_prot = xprt->prot; |
| clnt->cl_stats = program->stats; |
| rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait"); |
| |
| if (!clnt->cl_port) |
| clnt->cl_autobind = 1; |
| |
| clnt->cl_rtt = &clnt->cl_rtt_default; |
| rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); |
| |
| err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
| if (err < 0) |
| goto out_no_path; |
| |
| auth = rpcauth_create(flavor, clnt); |
| if (IS_ERR(auth)) { |
| printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
| flavor); |
| err = PTR_ERR(auth); |
| goto out_no_auth; |
| } |
| |
| /* save the nodename */ |
| clnt->cl_nodelen = strlen(system_utsname.nodename); |
| if (clnt->cl_nodelen > UNX_MAXNODENAME) |
| clnt->cl_nodelen = UNX_MAXNODENAME; |
| memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen); |
| return clnt; |
| |
| out_no_auth: |
| rpc_rmdir(clnt->cl_pathname); |
| out_no_path: |
| if (clnt->cl_server != clnt->cl_inline_name) |
| kfree(clnt->cl_server); |
| kfree(clnt); |
| out_err: |
| xprt_destroy(xprt); |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * Create an RPC client |
| * @xprt - pointer to xprt struct |
| * @servname - name of server |
| * @info - rpc_program |
| * @version - rpc_program version |
| * @authflavor - rpc_auth flavour to use |
| * |
| * Creates an RPC client structure, then pings the server in order to |
| * determine if it is up, and if it supports this program and version. |
| * |
| * This function should never be called by asynchronous tasks such as |
| * the portmapper. |
| */ |
| struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname, |
| struct rpc_program *info, u32 version, rpc_authflavor_t authflavor) |
| { |
| struct rpc_clnt *clnt; |
| int err; |
| |
| clnt = rpc_new_client(xprt, servname, info, version, authflavor); |
| if (IS_ERR(clnt)) |
| return clnt; |
| err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); |
| if (err == 0) |
| return clnt; |
| rpc_shutdown_client(clnt); |
| return ERR_PTR(err); |
| } |
| |
| /* |
| * This function clones the RPC client structure. It allows us to share the |
| * same transport while varying parameters such as the authentication |
| * flavour. |
| */ |
| struct rpc_clnt * |
| rpc_clone_client(struct rpc_clnt *clnt) |
| { |
| struct rpc_clnt *new; |
| |
| new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL); |
| if (!new) |
| goto out_no_clnt; |
| memcpy(new, clnt, sizeof(*new)); |
| atomic_set(&new->cl_count, 1); |
| atomic_set(&new->cl_users, 0); |
| new->cl_parent = clnt; |
| atomic_inc(&clnt->cl_count); |
| /* Duplicate portmapper */ |
| rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); |
| /* Turn off autobind on clones */ |
| new->cl_autobind = 0; |
| new->cl_oneshot = 0; |
| new->cl_dead = 0; |
| rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); |
| if (new->cl_auth) |
| atomic_inc(&new->cl_auth->au_count); |
| new->cl_pmap = &new->cl_pmap_default; |
| rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); |
| return new; |
| out_no_clnt: |
| printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| /* |
| * Properly shut down an RPC client, terminating all outstanding |
| * requests. Note that we must be certain that cl_oneshot and |
| * cl_dead are cleared, or else the client would be destroyed |
| * when the last task releases it. |
| */ |
| int |
| rpc_shutdown_client(struct rpc_clnt *clnt) |
| { |
| dprintk("RPC: shutting down %s client for %s, tasks=%d\n", |
| clnt->cl_protname, clnt->cl_server, |
| atomic_read(&clnt->cl_users)); |
| |
| while (atomic_read(&clnt->cl_users) > 0) { |
| /* Don't let rpc_release_client destroy us */ |
| clnt->cl_oneshot = 0; |
| clnt->cl_dead = 0; |
| rpc_killall_tasks(clnt); |
| sleep_on_timeout(&destroy_wait, 1*HZ); |
| } |
| |
| if (atomic_read(&clnt->cl_users) < 0) { |
| printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", |
| clnt, atomic_read(&clnt->cl_users)); |
| #ifdef RPC_DEBUG |
| rpc_show_tasks(); |
| #endif |
| BUG(); |
| } |
| |
| return rpc_destroy_client(clnt); |
| } |
| |
| /* |
| * Delete an RPC client |
| */ |
| int |
| rpc_destroy_client(struct rpc_clnt *clnt) |
| { |
| if (!atomic_dec_and_test(&clnt->cl_count)) |
| return 1; |
| BUG_ON(atomic_read(&clnt->cl_users) != 0); |
| |
| dprintk("RPC: destroying %s client for %s\n", |
| clnt->cl_protname, clnt->cl_server); |
| if (clnt->cl_auth) { |
| rpcauth_destroy(clnt->cl_auth); |
| clnt->cl_auth = NULL; |
| } |
| if (clnt->cl_parent != clnt) { |
| rpc_destroy_client(clnt->cl_parent); |
| goto out_free; |
| } |
| if (clnt->cl_pathname[0]) |
| rpc_rmdir(clnt->cl_pathname); |
| if (clnt->cl_xprt) { |
| xprt_destroy(clnt->cl_xprt); |
| clnt->cl_xprt = NULL; |
| } |
| if (clnt->cl_server != clnt->cl_inline_name) |
| kfree(clnt->cl_server); |
| out_free: |
| kfree(clnt); |
| return 0; |
| } |
| |
| /* |
| * Release an RPC client |
| */ |
| void |
| rpc_release_client(struct rpc_clnt *clnt) |
| { |
| dprintk("RPC: rpc_release_client(%p, %d)\n", |
| clnt, atomic_read(&clnt->cl_users)); |
| |
| if (!atomic_dec_and_test(&clnt->cl_users)) |
| return; |
| wake_up(&destroy_wait); |
| if (clnt->cl_oneshot || clnt->cl_dead) |
| rpc_destroy_client(clnt); |
| } |
| |
| /** |
| * rpc_bind_new_program - bind a new RPC program to an existing client |
| * @old - old rpc_client |
| * @program - rpc program to set |
| * @vers - rpc program version |
| * |
| * Clones the rpc client and sets up a new RPC program. This is mainly |
| * of use for enabling different RPC programs to share the same transport. |
| * The Sun NFSv2/v3 ACL protocol can do this. |
| */ |
| struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, |
| struct rpc_program *program, |
| int vers) |
| { |
| struct rpc_clnt *clnt; |
| struct rpc_version *version; |
| int err; |
| |
| BUG_ON(vers >= program->nrvers || !program->version[vers]); |
| version = program->version[vers]; |
| clnt = rpc_clone_client(old); |
| if (IS_ERR(clnt)) |
| goto out; |
| clnt->cl_procinfo = version->procs; |
| clnt->cl_maxproc = version->nrprocs; |
| clnt->cl_protname = program->name; |
| clnt->cl_prog = program->number; |
| clnt->cl_vers = version->number; |
| clnt->cl_stats = program->stats; |
| err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); |
| if (err != 0) { |
| rpc_shutdown_client(clnt); |
| clnt = ERR_PTR(err); |
| } |
| out: |
| return clnt; |
| } |
| |
| /* |
| * Default callback for async RPC calls |
| */ |
| static void |
| rpc_default_callback(struct rpc_task *task, void *data) |
| { |
| } |
| |
| static const struct rpc_call_ops rpc_default_ops = { |
| .rpc_call_done = rpc_default_callback, |
| }; |
| |
| /* |
| * Export the signal mask handling for synchronous code that |
| * sleeps on RPC calls |
| */ |
| #define RPC_INTR_SIGNALS (sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGKILL)) |
| |
| static void rpc_save_sigmask(sigset_t *oldset, int intr) |
| { |
| unsigned long sigallow = 0; |
| sigset_t sigmask; |
| |
| /* Block all signals except those listed in sigallow */ |
| if (intr) |
| sigallow |= RPC_INTR_SIGNALS; |
| siginitsetinv(&sigmask, sigallow); |
| sigprocmask(SIG_BLOCK, &sigmask, oldset); |
| } |
| |
| static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) |
| { |
| rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); |
| } |
| |
| static inline void rpc_restore_sigmask(sigset_t *oldset) |
| { |
| sigprocmask(SIG_SETMASK, oldset, NULL); |
| } |
| |
| void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
| { |
| rpc_save_sigmask(oldset, clnt->cl_intr); |
| } |
| |
| void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) |
| { |
| rpc_restore_sigmask(oldset); |
| } |
| |
| /* |
| * New rpc_call implementation |
| */ |
| int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) |
| { |
| struct rpc_task *task; |
| sigset_t oldset; |
| int status; |
| |
| /* If this client is slain all further I/O fails */ |
| if (clnt->cl_dead) |
| return -EIO; |
| |
| BUG_ON(flags & RPC_TASK_ASYNC); |
| |
| status = -ENOMEM; |
| task = rpc_new_task(clnt, flags, &rpc_default_ops, NULL); |
| if (task == NULL) |
| goto out; |
| |
| /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
| rpc_task_sigmask(task, &oldset); |
| |
| rpc_call_setup(task, msg, 0); |
| |
| /* Set up the call info struct and execute the task */ |
| if (task->tk_status == 0) { |
| status = rpc_execute(task); |
| } else { |
| status = task->tk_status; |
| rpc_release_task(task); |
| } |
| |
| rpc_restore_sigmask(&oldset); |
| out: |
| return status; |
| } |
| |
| /* |
| * New rpc_call implementation |
| */ |
| int |
| rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, |
| const struct rpc_call_ops *tk_ops, void *data) |
| { |
| struct rpc_task *task; |
| sigset_t oldset; |
| int status; |
| |
| /* If this client is slain all further I/O fails */ |
| if (clnt->cl_dead) |
| return -EIO; |
| |
| flags |= RPC_TASK_ASYNC; |
| |
| /* Create/initialize a new RPC task */ |
| status = -ENOMEM; |
| if (!(task = rpc_new_task(clnt, flags, tk_ops, data))) |
| goto out; |
| |
| /* Mask signals on GSS_AUTH upcalls */ |
| rpc_task_sigmask(task, &oldset); |
| |
| rpc_call_setup(task, msg, 0); |
| |
| /* Set up the call info struct and execute the task */ |
| status = task->tk_status; |
| if (status == 0) |
| rpc_execute(task); |
| else |
| rpc_release_task(task); |
| |
| rpc_restore_sigmask(&oldset); |
| out: |
| return status; |
| } |
| |
| |
| void |
| rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) |
| { |
| task->tk_msg = *msg; |
| task->tk_flags |= flags; |
| /* Bind the user cred */ |
| if (task->tk_msg.rpc_cred != NULL) |
| rpcauth_holdcred(task); |
| else |
| rpcauth_bindcred(task); |
| |
| if (task->tk_status == 0) |
| task->tk_action = call_start; |
| else |
| task->tk_action = rpc_exit_task; |
| } |
| |
| void |
| rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) |
| { |
| struct rpc_xprt *xprt = clnt->cl_xprt; |
| if (xprt->ops->set_buffer_size) |
| xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); |
| } |
| |
| /* |
| * Return size of largest payload RPC client can support, in bytes |
| * |
| * For stream transports, this is one RPC record fragment (see RFC |
| * 1831), as we don't support multi-record requests yet. For datagram |
| * transports, this is the size of an IP packet minus the IP, UDP, and |
| * RPC header sizes. |
| */ |
| size_t rpc_max_payload(struct rpc_clnt *clnt) |
| { |
| return clnt->cl_xprt->max_payload; |
| } |
| EXPORT_SYMBOL(rpc_max_payload); |
| |
| /* |
| * Restart an (async) RPC call. Usually called from within the |
| * exit handler. |
| */ |
| void |
| rpc_restart_call(struct rpc_task *task) |
| { |
| if (RPC_ASSASSINATED(task)) |
| return; |
| |
| task->tk_action = call_start; |
| } |
| |
| /* |
| * 0. Initial state |
| * |
| * Other FSM states can be visited zero or more times, but |
| * this state is visited exactly once for each RPC. |
| */ |
| static void |
| call_start(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| |
| dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, |
| clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, |
| (RPC_IS_ASYNC(task) ? "async" : "sync")); |
| |
| /* Increment call count */ |
| task->tk_msg.rpc_proc->p_count++; |
| clnt->cl_stats->rpccnt++; |
| task->tk_action = call_reserve; |
| } |
| |
| /* |
| * 1. Reserve an RPC call slot |
| */ |
| static void |
| call_reserve(struct rpc_task *task) |
| { |
| dprintk("RPC: %4d call_reserve\n", task->tk_pid); |
| |
| if (!rpcauth_uptodatecred(task)) { |
| task->tk_action = call_refresh; |
| return; |
| } |
| |
| task->tk_status = 0; |
| task->tk_action = call_reserveresult; |
| xprt_reserve(task); |
| } |
| |
| /* |
| * 1b. Grok the result of xprt_reserve() |
| */ |
| static void |
| call_reserveresult(struct rpc_task *task) |
| { |
| int status = task->tk_status; |
| |
| dprintk("RPC: %4d call_reserveresult (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| /* |
| * After a call to xprt_reserve(), we must have either |
| * a request slot or else an error status. |
| */ |
| task->tk_status = 0; |
| if (status >= 0) { |
| if (task->tk_rqstp) { |
| task->tk_action = call_allocate; |
| return; |
| } |
| |
| printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", |
| __FUNCTION__, status); |
| rpc_exit(task, -EIO); |
| return; |
| } |
| |
| /* |
| * Even though there was an error, we may have acquired |
| * a request slot somehow. Make sure not to leak it. |
| */ |
| if (task->tk_rqstp) { |
| printk(KERN_ERR "%s: status=%d, request allocated anyway\n", |
| __FUNCTION__, status); |
| xprt_release(task); |
| } |
| |
| switch (status) { |
| case -EAGAIN: /* woken up; retry */ |
| task->tk_action = call_reserve; |
| return; |
| case -EIO: /* probably a shutdown */ |
| break; |
| default: |
| printk(KERN_ERR "%s: unrecognized error %d, exiting\n", |
| __FUNCTION__, status); |
| break; |
| } |
| rpc_exit(task, status); |
| } |
| |
| /* |
| * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. |
| * (Note: buffer memory is freed in rpc_task_release). |
| */ |
| static void |
| call_allocate(struct rpc_task *task) |
| { |
| unsigned int bufsiz; |
| |
| dprintk("RPC: %4d call_allocate (status %d)\n", |
| task->tk_pid, task->tk_status); |
| task->tk_action = call_bind; |
| if (task->tk_buffer) |
| return; |
| |
| /* FIXME: compute buffer requirements more exactly using |
| * auth->au_wslack */ |
| bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; |
| |
| if (rpc_malloc(task, bufsiz << 1) != NULL) |
| return; |
| printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); |
| |
| if (RPC_IS_ASYNC(task) || !signalled()) { |
| xprt_release(task); |
| task->tk_action = call_reserve; |
| rpc_delay(task, HZ>>4); |
| return; |
| } |
| |
| rpc_exit(task, -ERESTARTSYS); |
| } |
| |
| static inline int |
| rpc_task_need_encode(struct rpc_task *task) |
| { |
| return task->tk_rqstp->rq_snd_buf.len == 0; |
| } |
| |
| static inline void |
| rpc_task_force_reencode(struct rpc_task *task) |
| { |
| task->tk_rqstp->rq_snd_buf.len = 0; |
| } |
| |
| /* |
| * 3. Encode arguments of an RPC call |
| */ |
| static void |
| call_encode(struct rpc_task *task) |
| { |
| struct rpc_rqst *req = task->tk_rqstp; |
| struct xdr_buf *sndbuf = &req->rq_snd_buf; |
| struct xdr_buf *rcvbuf = &req->rq_rcv_buf; |
| unsigned int bufsiz; |
| kxdrproc_t encode; |
| u32 *p; |
| |
| dprintk("RPC: %4d call_encode (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| /* Default buffer setup */ |
| bufsiz = task->tk_bufsize >> 1; |
| sndbuf->head[0].iov_base = (void *)task->tk_buffer; |
| sndbuf->head[0].iov_len = bufsiz; |
| sndbuf->tail[0].iov_len = 0; |
| sndbuf->page_len = 0; |
| sndbuf->len = 0; |
| sndbuf->buflen = bufsiz; |
| rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz); |
| rcvbuf->head[0].iov_len = bufsiz; |
| rcvbuf->tail[0].iov_len = 0; |
| rcvbuf->page_len = 0; |
| rcvbuf->len = 0; |
| rcvbuf->buflen = bufsiz; |
| |
| /* Encode header and provided arguments */ |
| encode = task->tk_msg.rpc_proc->p_encode; |
| if (!(p = call_header(task))) { |
| printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); |
| rpc_exit(task, -EIO); |
| return; |
| } |
| if (encode == NULL) |
| return; |
| |
| task->tk_status = rpcauth_wrap_req(task, encode, req, p, |
| task->tk_msg.rpc_argp); |
| if (task->tk_status == -ENOMEM) { |
| /* XXX: Is this sane? */ |
| rpc_delay(task, 3*HZ); |
| task->tk_status = -EAGAIN; |
| } |
| } |
| |
| /* |
| * 4. Get the server port number if not yet set |
| */ |
| static void |
| call_bind(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| |
| dprintk("RPC: %4d call_bind (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| task->tk_action = call_connect; |
| if (!clnt->cl_port) { |
| task->tk_action = call_bind_status; |
| task->tk_timeout = task->tk_xprt->bind_timeout; |
| rpc_getport(task, clnt); |
| } |
| } |
| |
| /* |
| * 4a. Sort out bind result |
| */ |
| static void |
| call_bind_status(struct rpc_task *task) |
| { |
| int status = -EACCES; |
| |
| if (task->tk_status >= 0) { |
| dprintk("RPC: %4d call_bind_status (status %d)\n", |
| task->tk_pid, task->tk_status); |
| task->tk_status = 0; |
| task->tk_action = call_connect; |
| return; |
| } |
| |
| switch (task->tk_status) { |
| case -EACCES: |
| dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", |
| task->tk_pid); |
| rpc_delay(task, 3*HZ); |
| goto retry_bind; |
| case -ETIMEDOUT: |
| dprintk("RPC: %4d rpcbind request timed out\n", |
| task->tk_pid); |
| if (RPC_IS_SOFT(task)) { |
| status = -EIO; |
| break; |
| } |
| goto retry_bind; |
| case -EPFNOSUPPORT: |
| dprintk("RPC: %4d remote rpcbind service unavailable\n", |
| task->tk_pid); |
| break; |
| case -EPROTONOSUPPORT: |
| dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", |
| task->tk_pid); |
| break; |
| default: |
| dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", |
| task->tk_pid, -task->tk_status); |
| status = -EIO; |
| break; |
| } |
| |
| rpc_exit(task, status); |
| return; |
| |
| retry_bind: |
| task->tk_status = 0; |
| task->tk_action = call_bind; |
| return; |
| } |
| |
| /* |
| * 4b. Connect to the RPC server |
| */ |
| static void |
| call_connect(struct rpc_task *task) |
| { |
| struct rpc_xprt *xprt = task->tk_xprt; |
| |
| dprintk("RPC: %4d call_connect xprt %p %s connected\n", |
| task->tk_pid, xprt, |
| (xprt_connected(xprt) ? "is" : "is not")); |
| |
| task->tk_action = call_transmit; |
| if (!xprt_connected(xprt)) { |
| task->tk_action = call_connect_status; |
| if (task->tk_status < 0) |
| return; |
| xprt_connect(task); |
| } |
| } |
| |
| /* |
| * 4c. Sort out connect result |
| */ |
| static void |
| call_connect_status(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| int status = task->tk_status; |
| |
| dprintk("RPC: %5u call_connect_status (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| task->tk_status = 0; |
| if (status >= 0) { |
| clnt->cl_stats->netreconn++; |
| task->tk_action = call_transmit; |
| return; |
| } |
| |
| /* Something failed: remote service port may have changed */ |
| if (clnt->cl_autobind) |
| clnt->cl_port = 0; |
| |
| switch (status) { |
| case -ENOTCONN: |
| case -ETIMEDOUT: |
| case -EAGAIN: |
| task->tk_action = call_bind; |
| break; |
| default: |
| rpc_exit(task, -EIO); |
| break; |
| } |
| } |
| |
| /* |
| * 5. Transmit the RPC request, and wait for reply |
| */ |
| static void |
| call_transmit(struct rpc_task *task) |
| { |
| dprintk("RPC: %4d call_transmit (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| task->tk_action = call_status; |
| if (task->tk_status < 0) |
| return; |
| task->tk_status = xprt_prepare_transmit(task); |
| if (task->tk_status != 0) |
| return; |
| /* Encode here so that rpcsec_gss can use correct sequence number. */ |
| if (rpc_task_need_encode(task)) { |
| task->tk_rqstp->rq_bytes_sent = 0; |
| call_encode(task); |
| /* Did the encode result in an error condition? */ |
| if (task->tk_status != 0) |
| goto out_nosend; |
| } |
| task->tk_action = call_transmit_status; |
| xprt_transmit(task); |
| if (task->tk_status < 0) |
| return; |
| if (!task->tk_msg.rpc_proc->p_decode) { |
| task->tk_action = rpc_exit_task; |
| rpc_wake_up_task(task); |
| } |
| return; |
| out_nosend: |
| /* release socket write lock before attempting to handle error */ |
| xprt_abort_transmit(task); |
| rpc_task_force_reencode(task); |
| } |
| |
| /* |
| * 6. Sort out the RPC call status |
| */ |
| static void |
| call_status(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| struct rpc_rqst *req = task->tk_rqstp; |
| int status; |
| |
| if (req->rq_received > 0 && !req->rq_bytes_sent) |
| task->tk_status = req->rq_received; |
| |
| dprintk("RPC: %4d call_status (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| status = task->tk_status; |
| if (status >= 0) { |
| task->tk_action = call_decode; |
| return; |
| } |
| |
| task->tk_status = 0; |
| switch(status) { |
| case -ETIMEDOUT: |
| task->tk_action = call_timeout; |
| break; |
| case -ECONNREFUSED: |
| case -ENOTCONN: |
| if (clnt->cl_autobind) |
| clnt->cl_port = 0; |
| task->tk_action = call_bind; |
| break; |
| case -EAGAIN: |
| task->tk_action = call_transmit; |
| break; |
| case -EIO: |
| /* shutdown or soft timeout */ |
| rpc_exit(task, status); |
| break; |
| default: |
| if (clnt->cl_chatty) |
| printk("%s: RPC call returned error %d\n", |
| clnt->cl_protname, -status); |
| rpc_exit(task, status); |
| break; |
| } |
| } |
| |
| /* |
| * 6a. Handle transmission errors. |
| */ |
| static void |
| call_transmit_status(struct rpc_task *task) |
| { |
| if (task->tk_status != -EAGAIN) |
| rpc_task_force_reencode(task); |
| call_status(task); |
| } |
| |
| /* |
| * 6b. Handle RPC timeout |
| * We do not release the request slot, so we keep using the |
| * same XID for all retransmits. |
| */ |
| static void |
| call_timeout(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| |
| if (xprt_adjust_timeout(task->tk_rqstp) == 0) { |
| dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); |
| goto retry; |
| } |
| |
| dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); |
| if (RPC_IS_SOFT(task)) { |
| if (clnt->cl_chatty) |
| printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
| clnt->cl_protname, clnt->cl_server); |
| rpc_exit(task, -EIO); |
| return; |
| } |
| |
| if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
| task->tk_flags |= RPC_CALL_MAJORSEEN; |
| printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
| clnt->cl_protname, clnt->cl_server); |
| } |
| if (clnt->cl_autobind) |
| clnt->cl_port = 0; |
| |
| retry: |
| clnt->cl_stats->rpcretrans++; |
| task->tk_action = call_bind; |
| task->tk_status = 0; |
| } |
| |
| /* |
| * 7. Decode the RPC reply |
| */ |
| static void |
| call_decode(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| struct rpc_rqst *req = task->tk_rqstp; |
| kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; |
| u32 *p; |
| |
| dprintk("RPC: %4d call_decode (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) { |
| printk(KERN_NOTICE "%s: server %s OK\n", |
| clnt->cl_protname, clnt->cl_server); |
| task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
| } |
| |
| if (task->tk_status < 12) { |
| if (!RPC_IS_SOFT(task)) { |
| task->tk_action = call_bind; |
| clnt->cl_stats->rpcretrans++; |
| goto out_retry; |
| } |
| printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n", |
| clnt->cl_protname, task->tk_status); |
| rpc_exit(task, -EIO); |
| return; |
| } |
| |
| req->rq_rcv_buf.len = req->rq_private_buf.len; |
| |
| /* Check that the softirq receive buffer is valid */ |
| WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, |
| sizeof(req->rq_rcv_buf)) != 0); |
| |
| /* Verify the RPC header */ |
| p = call_verify(task); |
| if (IS_ERR(p)) { |
| if (p == ERR_PTR(-EAGAIN)) |
| goto out_retry; |
| return; |
| } |
| |
| task->tk_action = rpc_exit_task; |
| |
| if (decode) |
| task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
| task->tk_msg.rpc_resp); |
| dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, |
| task->tk_status); |
| return; |
| out_retry: |
| req->rq_received = req->rq_private_buf.len = 0; |
| task->tk_status = 0; |
| } |
| |
| /* |
| * 8. Refresh the credentials if rejected by the server |
| */ |
| static void |
| call_refresh(struct rpc_task *task) |
| { |
| dprintk("RPC: %4d call_refresh\n", task->tk_pid); |
| |
| xprt_release(task); /* Must do to obtain new XID */ |
| task->tk_action = call_refreshresult; |
| task->tk_status = 0; |
| task->tk_client->cl_stats->rpcauthrefresh++; |
| rpcauth_refreshcred(task); |
| } |
| |
| /* |
| * 8a. Process the results of a credential refresh |
| */ |
| static void |
| call_refreshresult(struct rpc_task *task) |
| { |
| int status = task->tk_status; |
| dprintk("RPC: %4d call_refreshresult (status %d)\n", |
| task->tk_pid, task->tk_status); |
| |
| task->tk_status = 0; |
| task->tk_action = call_reserve; |
| if (status >= 0 && rpcauth_uptodatecred(task)) |
| return; |
| if (status == -EACCES) { |
| rpc_exit(task, -EACCES); |
| return; |
| } |
| task->tk_action = call_refresh; |
| if (status != -ETIMEDOUT) |
| rpc_delay(task, 3*HZ); |
| return; |
| } |
| |
| /* |
| * Call header serialization |
| */ |
| static u32 * |
| call_header(struct rpc_task *task) |
| { |
| struct rpc_clnt *clnt = task->tk_client; |
| struct rpc_rqst *req = task->tk_rqstp; |
| u32 *p = req->rq_svec[0].iov_base; |
| |
| /* FIXME: check buffer size? */ |
| |
| p = xprt_skip_transport_header(task->tk_xprt, p); |
| *p++ = req->rq_xid; /* XID */ |
| *p++ = htonl(RPC_CALL); /* CALL */ |
| *p++ = htonl(RPC_VERSION); /* RPC version */ |
| *p++ = htonl(clnt->cl_prog); /* program number */ |
| *p++ = htonl(clnt->cl_vers); /* program version */ |
| *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ |
| p = rpcauth_marshcred(task, p); |
| req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); |
| return p; |
| } |
| |
| /* |
| * Reply header verification |
| */ |
| static u32 * |
| call_verify(struct rpc_task *task) |
| { |
| struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
| int len = task->tk_rqstp->rq_rcv_buf.len >> 2; |
| u32 *p = iov->iov_base, n; |
| int error = -EACCES; |
| |
| if ((len -= 3) < 0) |
| goto out_overflow; |
| p += 1; /* skip XID */ |
| |
| if ((n = ntohl(*p++)) != RPC_REPLY) { |
| printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); |
| goto out_garbage; |
| } |
| if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
| if (--len < 0) |
| goto out_overflow; |
| switch ((n = ntohl(*p++))) { |
| case RPC_AUTH_ERROR: |
| break; |
| case RPC_MISMATCH: |
| dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); |
| error = -EPROTONOSUPPORT; |
| goto out_err; |
| default: |
| dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); |
| goto out_eio; |
| } |
| if (--len < 0) |
| goto out_overflow; |
| switch ((n = ntohl(*p++))) { |
| case RPC_AUTH_REJECTEDCRED: |
| case RPC_AUTH_REJECTEDVERF: |
| case RPCSEC_GSS_CREDPROBLEM: |
| case RPCSEC_GSS_CTXPROBLEM: |
| if (!task->tk_cred_retry) |
| break; |
| task->tk_cred_retry--; |
| dprintk("RPC: %4d call_verify: retry stale creds\n", |
| task->tk_pid); |
| rpcauth_invalcred(task); |
| task->tk_action = call_refresh; |
| goto out_retry; |
| case RPC_AUTH_BADCRED: |
| case RPC_AUTH_BADVERF: |
| /* possibly garbled cred/verf? */ |
| if (!task->tk_garb_retry) |
| break; |
| task->tk_garb_retry--; |
| dprintk("RPC: %4d call_verify: retry garbled creds\n", |
| task->tk_pid); |
| task->tk_action = call_bind; |
| goto out_retry; |
| case RPC_AUTH_TOOWEAK: |
| printk(KERN_NOTICE "call_verify: server requires stronger " |
| "authentication.\n"); |
| break; |
| default: |
| printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); |
| error = -EIO; |
| } |
| dprintk("RPC: %4d call_verify: call rejected %d\n", |
| task->tk_pid, n); |
| goto out_err; |
| } |
| if (!(p = rpcauth_checkverf(task, p))) { |
| printk(KERN_WARNING "call_verify: auth check failed\n"); |
| goto out_garbage; /* bad verifier, retry */ |
| } |
| len = p - (u32 *)iov->iov_base - 1; |
| if (len < 0) |
| goto out_overflow; |
| switch ((n = ntohl(*p++))) { |
| case RPC_SUCCESS: |
| return p; |
| case RPC_PROG_UNAVAIL: |
| dprintk("RPC: call_verify: program %u is unsupported by server %s\n", |
| (unsigned int)task->tk_client->cl_prog, |
| task->tk_client->cl_server); |
| error = -EPFNOSUPPORT; |
| goto out_err; |
| case RPC_PROG_MISMATCH: |
| dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", |
| (unsigned int)task->tk_client->cl_prog, |
| (unsigned int)task->tk_client->cl_vers, |
| task->tk_client->cl_server); |
| error = -EPROTONOSUPPORT; |
| goto out_err; |
| case RPC_PROC_UNAVAIL: |
| dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", |
| task->tk_msg.rpc_proc, |
| task->tk_client->cl_prog, |
| task->tk_client->cl_vers, |
| task->tk_client->cl_server); |
| error = -EOPNOTSUPP; |
| goto out_err; |
| case RPC_GARBAGE_ARGS: |
| dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); |
| break; /* retry */ |
| default: |
| printk(KERN_WARNING "call_verify: server accept status: %x\n", n); |
| /* Also retry */ |
| } |
| |
| out_garbage: |
| task->tk_client->cl_stats->rpcgarbage++; |
| if (task->tk_garb_retry) { |
| task->tk_garb_retry--; |
| dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); |
| task->tk_action = call_bind; |
| out_retry: |
| return ERR_PTR(-EAGAIN); |
| } |
| printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); |
| out_eio: |
| error = -EIO; |
| out_err: |
| rpc_exit(task, error); |
| return ERR_PTR(error); |
| out_overflow: |
| printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); |
| goto out_garbage; |
| } |
| |
| static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj) |
| { |
| return 0; |
| } |
| |
| static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj) |
| { |
| return 0; |
| } |
| |
| static struct rpc_procinfo rpcproc_null = { |
| .p_encode = rpcproc_encode_null, |
| .p_decode = rpcproc_decode_null, |
| }; |
| |
| int rpc_ping(struct rpc_clnt *clnt, int flags) |
| { |
| struct rpc_message msg = { |
| .rpc_proc = &rpcproc_null, |
| }; |
| int err; |
| msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); |
| err = rpc_call_sync(clnt, &msg, flags); |
| put_rpccred(msg.rpc_cred); |
| return err; |
| } |