![Trond Myklebust](/assets/img/avatar_default.png)
If the call to xprt_transmit() fails due to socket buffer space exhaustion, we do not need to re-encode the RPC message when we loop back through call_transmit. Re-encoding can actually end up triggering the WARN_ON() in call_decode() if we re-encode something like a read() request and auth->au_rslack has changed. It can also cause us to increment the RPCSEC_GSS sequence number beyond the limits of the allowed window. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1278 lines
30 KiB
C
1278 lines
30 KiB
C
/*
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* linux/net/sunrpc/clnt.c
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*
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* This file contains the high-level RPC interface.
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* It is modeled as a finite state machine to support both synchronous
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* and asynchronous requests.
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*
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* - RPC header generation and argument serialization.
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* - Credential refresh.
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* - TCP connect handling.
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* - Retry of operation when it is suspected the operation failed because
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* of uid squashing on the server, or when the credentials were stale
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* and need to be refreshed, or when a packet was damaged in transit.
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* This may be have to be moved to the VFS layer.
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*
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* NB: BSD uses a more intelligent approach to guessing when a request
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* or reply has been lost by keeping the RTO estimate for each procedure.
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* We currently make do with a constant timeout value.
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*
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* Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
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* Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <asm/system.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/utsname.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/workqueue.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/nfs.h>
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#define RPC_SLACK_SPACE (1024) /* total overkill */
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_CALL
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#endif
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static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
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static void call_start(struct rpc_task *task);
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static void call_reserve(struct rpc_task *task);
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static void call_reserveresult(struct rpc_task *task);
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static void call_allocate(struct rpc_task *task);
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static void call_encode(struct rpc_task *task);
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static void call_decode(struct rpc_task *task);
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static void call_bind(struct rpc_task *task);
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static void call_bind_status(struct rpc_task *task);
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static void call_transmit(struct rpc_task *task);
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static void call_status(struct rpc_task *task);
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static void call_transmit_status(struct rpc_task *task);
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static void call_refresh(struct rpc_task *task);
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static void call_refreshresult(struct rpc_task *task);
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static void call_timeout(struct rpc_task *task);
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static void call_connect(struct rpc_task *task);
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static void call_connect_status(struct rpc_task *task);
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static u32 * call_header(struct rpc_task *task);
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static u32 * call_verify(struct rpc_task *task);
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static int
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rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
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{
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static uint32_t clntid;
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int error;
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if (dir_name == NULL)
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return 0;
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for (;;) {
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snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
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"%s/clnt%x", dir_name,
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(unsigned int)clntid++);
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clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
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clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
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if (!IS_ERR(clnt->cl_dentry))
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return 0;
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error = PTR_ERR(clnt->cl_dentry);
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if (error != -EEXIST) {
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printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
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clnt->cl_pathname, error);
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return error;
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}
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}
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}
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/*
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* Create an RPC client
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* FIXME: This should also take a flags argument (as in task->tk_flags).
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* It's called (among others) from pmap_create_client, which may in
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* turn be called by an async task. In this case, rpciod should not be
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* made to sleep too long.
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*/
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struct rpc_clnt *
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rpc_new_client(struct rpc_xprt *xprt, char *servname,
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struct rpc_program *program, u32 vers,
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rpc_authflavor_t flavor)
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{
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struct rpc_version *version;
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struct rpc_clnt *clnt = NULL;
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struct rpc_auth *auth;
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int err;
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int len;
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dprintk("RPC: creating %s client for %s (xprt %p)\n",
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program->name, servname, xprt);
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err = -EINVAL;
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if (!xprt)
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goto out_err;
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if (vers >= program->nrvers || !(version = program->version[vers]))
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goto out_err;
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err = -ENOMEM;
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clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
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if (!clnt)
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goto out_err;
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memset(clnt, 0, sizeof(*clnt));
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atomic_set(&clnt->cl_users, 0);
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atomic_set(&clnt->cl_count, 1);
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clnt->cl_parent = clnt;
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clnt->cl_server = clnt->cl_inline_name;
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len = strlen(servname) + 1;
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if (len > sizeof(clnt->cl_inline_name)) {
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char *buf = kmalloc(len, GFP_KERNEL);
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if (buf != 0)
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clnt->cl_server = buf;
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else
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len = sizeof(clnt->cl_inline_name);
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}
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strlcpy(clnt->cl_server, servname, len);
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clnt->cl_xprt = xprt;
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clnt->cl_procinfo = version->procs;
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clnt->cl_maxproc = version->nrprocs;
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clnt->cl_protname = program->name;
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clnt->cl_pmap = &clnt->cl_pmap_default;
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clnt->cl_port = xprt->addr.sin_port;
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clnt->cl_prog = program->number;
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clnt->cl_vers = version->number;
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clnt->cl_prot = xprt->prot;
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clnt->cl_stats = program->stats;
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rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
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if (!clnt->cl_port)
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clnt->cl_autobind = 1;
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clnt->cl_rtt = &clnt->cl_rtt_default;
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rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
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err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
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if (err < 0)
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goto out_no_path;
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auth = rpcauth_create(flavor, clnt);
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if (IS_ERR(auth)) {
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printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
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flavor);
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err = PTR_ERR(auth);
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goto out_no_auth;
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}
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/* save the nodename */
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clnt->cl_nodelen = strlen(system_utsname.nodename);
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if (clnt->cl_nodelen > UNX_MAXNODENAME)
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clnt->cl_nodelen = UNX_MAXNODENAME;
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memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
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return clnt;
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out_no_auth:
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rpc_rmdir(clnt->cl_pathname);
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out_no_path:
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if (clnt->cl_server != clnt->cl_inline_name)
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kfree(clnt->cl_server);
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kfree(clnt);
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out_err:
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xprt_destroy(xprt);
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return ERR_PTR(err);
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}
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/**
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* Create an RPC client
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* @xprt - pointer to xprt struct
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* @servname - name of server
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* @info - rpc_program
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* @version - rpc_program version
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* @authflavor - rpc_auth flavour to use
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*
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* Creates an RPC client structure, then pings the server in order to
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* determine if it is up, and if it supports this program and version.
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*
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* This function should never be called by asynchronous tasks such as
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* the portmapper.
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*/
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struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname,
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struct rpc_program *info, u32 version, rpc_authflavor_t authflavor)
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{
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struct rpc_clnt *clnt;
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int err;
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clnt = rpc_new_client(xprt, servname, info, version, authflavor);
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if (IS_ERR(clnt))
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return clnt;
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err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR);
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if (err == 0)
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return clnt;
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rpc_shutdown_client(clnt);
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return ERR_PTR(err);
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}
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/*
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* This function clones the RPC client structure. It allows us to share the
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* same transport while varying parameters such as the authentication
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* flavour.
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*/
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struct rpc_clnt *
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rpc_clone_client(struct rpc_clnt *clnt)
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{
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struct rpc_clnt *new;
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new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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goto out_no_clnt;
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memcpy(new, clnt, sizeof(*new));
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atomic_set(&new->cl_count, 1);
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atomic_set(&new->cl_users, 0);
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new->cl_parent = clnt;
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atomic_inc(&clnt->cl_count);
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/* Duplicate portmapper */
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rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
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/* Turn off autobind on clones */
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new->cl_autobind = 0;
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new->cl_oneshot = 0;
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new->cl_dead = 0;
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rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
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if (new->cl_auth)
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atomic_inc(&new->cl_auth->au_count);
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new->cl_pmap = &new->cl_pmap_default;
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rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
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return new;
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out_no_clnt:
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printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
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return ERR_PTR(-ENOMEM);
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}
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/*
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* Properly shut down an RPC client, terminating all outstanding
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* requests. Note that we must be certain that cl_oneshot and
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* cl_dead are cleared, or else the client would be destroyed
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* when the last task releases it.
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*/
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int
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rpc_shutdown_client(struct rpc_clnt *clnt)
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{
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dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
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clnt->cl_protname, clnt->cl_server,
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atomic_read(&clnt->cl_users));
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while (atomic_read(&clnt->cl_users) > 0) {
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/* Don't let rpc_release_client destroy us */
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clnt->cl_oneshot = 0;
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clnt->cl_dead = 0;
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rpc_killall_tasks(clnt);
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sleep_on_timeout(&destroy_wait, 1*HZ);
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}
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if (atomic_read(&clnt->cl_users) < 0) {
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printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
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clnt, atomic_read(&clnt->cl_users));
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#ifdef RPC_DEBUG
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rpc_show_tasks();
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#endif
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BUG();
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}
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return rpc_destroy_client(clnt);
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}
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/*
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* Delete an RPC client
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*/
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int
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rpc_destroy_client(struct rpc_clnt *clnt)
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{
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if (!atomic_dec_and_test(&clnt->cl_count))
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return 1;
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BUG_ON(atomic_read(&clnt->cl_users) != 0);
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dprintk("RPC: destroying %s client for %s\n",
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clnt->cl_protname, clnt->cl_server);
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if (clnt->cl_auth) {
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rpcauth_destroy(clnt->cl_auth);
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clnt->cl_auth = NULL;
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}
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if (clnt->cl_parent != clnt) {
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rpc_destroy_client(clnt->cl_parent);
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goto out_free;
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}
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if (clnt->cl_pathname[0])
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rpc_rmdir(clnt->cl_pathname);
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if (clnt->cl_xprt) {
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xprt_destroy(clnt->cl_xprt);
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clnt->cl_xprt = NULL;
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}
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if (clnt->cl_server != clnt->cl_inline_name)
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kfree(clnt->cl_server);
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out_free:
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kfree(clnt);
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return 0;
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}
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/*
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* Release an RPC client
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*/
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void
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rpc_release_client(struct rpc_clnt *clnt)
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{
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dprintk("RPC: rpc_release_client(%p, %d)\n",
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clnt, atomic_read(&clnt->cl_users));
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if (!atomic_dec_and_test(&clnt->cl_users))
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return;
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wake_up(&destroy_wait);
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if (clnt->cl_oneshot || clnt->cl_dead)
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rpc_destroy_client(clnt);
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}
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/**
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* rpc_bind_new_program - bind a new RPC program to an existing client
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* @old - old rpc_client
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* @program - rpc program to set
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* @vers - rpc program version
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*
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* Clones the rpc client and sets up a new RPC program. This is mainly
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* of use for enabling different RPC programs to share the same transport.
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* The Sun NFSv2/v3 ACL protocol can do this.
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*/
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struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
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struct rpc_program *program,
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int vers)
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{
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struct rpc_clnt *clnt;
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struct rpc_version *version;
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int err;
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BUG_ON(vers >= program->nrvers || !program->version[vers]);
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version = program->version[vers];
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clnt = rpc_clone_client(old);
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if (IS_ERR(clnt))
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goto out;
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clnt->cl_procinfo = version->procs;
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clnt->cl_maxproc = version->nrprocs;
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clnt->cl_protname = program->name;
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clnt->cl_prog = program->number;
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clnt->cl_vers = version->number;
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clnt->cl_stats = program->stats;
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err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR);
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if (err != 0) {
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rpc_shutdown_client(clnt);
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clnt = ERR_PTR(err);
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}
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out:
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return clnt;
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}
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|
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/*
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* Default callback for async RPC calls
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*/
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static void
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rpc_default_callback(struct rpc_task *task)
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{
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}
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|
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/*
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* Export the signal mask handling for synchronous code that
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* sleeps on RPC calls
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*/
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#define RPC_INTR_SIGNALS (sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGKILL))
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static void rpc_save_sigmask(sigset_t *oldset, int intr)
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{
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unsigned long sigallow = 0;
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sigset_t sigmask;
|
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|
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/* Block all signals except those listed in sigallow */
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if (intr)
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sigallow |= RPC_INTR_SIGNALS;
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siginitsetinv(&sigmask, sigallow);
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sigprocmask(SIG_BLOCK, &sigmask, oldset);
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}
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|
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static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset)
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{
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rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task));
|
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}
|
|
|
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static inline void rpc_restore_sigmask(sigset_t *oldset)
|
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{
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sigprocmask(SIG_SETMASK, oldset, NULL);
|
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}
|
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|
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void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
|
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{
|
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rpc_save_sigmask(oldset, clnt->cl_intr);
|
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}
|
|
|
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void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
|
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{
|
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rpc_restore_sigmask(oldset);
|
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}
|
|
|
|
/*
|
|
* New rpc_call implementation
|
|
*/
|
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int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
|
|
{
|
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struct rpc_task *task;
|
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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, NULL, flags);
|
|
if (task == NULL)
|
|
goto out;
|
|
|
|
/* Mask signals on RPC calls _and_ GSS_AUTH upcalls */
|
|
rpc_task_sigmask(task, &oldset);
|
|
|
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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,
|
|
rpc_action callback, 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)
|
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return -EIO;
|
|
|
|
flags |= RPC_TASK_ASYNC;
|
|
|
|
/* Create/initialize a new RPC task */
|
|
if (!callback)
|
|
callback = rpc_default_callback;
|
|
status = -ENOMEM;
|
|
if (!(task = rpc_new_task(clnt, callback, flags)))
|
|
goto out;
|
|
task->tk_calldata = data;
|
|
|
|
/* 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 = NULL;
|
|
}
|
|
|
|
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 = NULL;
|
|
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 */
|
|
if (!(p = call_verify(task))) {
|
|
if (task->tk_action == NULL)
|
|
return;
|
|
goto out_retry;
|
|
}
|
|
|
|
task->tk_action = NULL;
|
|
|
|
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_retry;
|
|
}
|
|
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;
|
|
return NULL;
|
|
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;
|
|
return NULL;
|
|
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_retry; /* 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_retry:
|
|
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;
|
|
return NULL;
|
|
}
|
|
printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
|
|
out_eio:
|
|
error = -EIO;
|
|
out_err:
|
|
rpc_exit(task, error);
|
|
return NULL;
|
|
out_overflow:
|
|
printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);
|
|
goto out_retry;
|
|
}
|
|
|
|
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;
|
|
}
|