patch-2.1.32 linux/net/sunrpc/svc.c

• Lines: 358
• Date: Thu Mar 20 07:03:20 1997
• Orig file: v2.1.31/linux/net/sunrpc/svc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/net/sunrpc/svc.c linux/net/sunrpc/svc.c
@@ -0,0 +1,357 @@
+/*
+ * linux/net/sunrpc/svc.c
+ *
+ * High-level RPC service routines
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#define __KERNEL_SYSCALLS__
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/unistd.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/clnt.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCDSP
+
+/*
+ * Create an RPC service
+ */
+struct svc_serv *
+svc_create(struct svc_program *prog, unsigned int bufsize, unsigned int xdrsize)
+{
+	struct svc_serv	*serv;
+
+	xdr_init();
+
+	if (!(serv = (struct svc_serv *) kmalloc(sizeof(*serv), GFP_KERNEL)))
+		return NULL;
+
+	memset(serv, 0, sizeof(*serv));
+	serv->sv_program   = prog;
+	serv->sv_nrthreads = 1;
+	serv->sv_stats     = prog->pg_stats;
+	serv->sv_bufsz	   = bufsize? bufsize : 4096;
+	serv->sv_xdrsize   = xdrsize;
+
+	serv->sv_name      = prog->pg_name;
+
+	/* Remove any stale portmap registrations */
+	svc_register(serv, 0, 0);
+
+	return serv;
+}
+
+/*
+ * Destroy an RPC service
+ */
+void
+svc_destroy(struct svc_serv *serv)
+{
+	struct svc_sock	*svsk;
+
+	dprintk("RPC: svc_destroy(%s, %d)\n",
+				serv->sv_program->pg_name,
+				serv->sv_nrthreads);
+
+	if (--(serv->sv_nrthreads) != 0)
+		return;
+	while ((svsk = serv->sv_allsocks) != NULL)
+		svc_delete_socket(svsk);
+
+	/* Unregister service with the portmapper */
+	svc_register(serv, 0, 0);
+	kfree(serv);
+}
+
+/*
+ * Allocate an RPC server buffer
+ * Later versions may do nifty things by allocating multiple pages
+ * of memory directly and putting them into the bufp->iov.
+ */
+int
+svc_init_buffer(struct svc_buf *bufp, unsigned int size)
+{
+	if (!(bufp->area = (u32 *) kmalloc(size, GFP_KERNEL)))
+		return 0;
+	bufp->base   = bufp->area;
+	bufp->buf    = bufp->area;
+	bufp->len    = 0;
+	bufp->buflen = size >> 2;
+
+	bufp->iov[0].iov_base = bufp->area;
+	bufp->iov[0].iov_len  = size;
+	bufp->nriov = 1;
+
+	return 1;
+}
+
+/*
+ * Release an RPC server buffer
+ */
+void
+svc_release_buffer(struct svc_buf *bufp)
+{
+	kfree(bufp->area);
+	bufp->area = 0;
+}
+
+/*
+ * Create a server thread
+ */
+int
+svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
+{
+	struct svc_rqst	*rqstp = 0;
+	int		error;
+
+	if (!(rqstp = kmalloc(sizeof(*rqstp), GFP_KERNEL)))
+		return -ENOMEM;
+
+	memset(rqstp, 0, sizeof(*rqstp));
+	if (!(rqstp->rq_argp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
+	 || !(rqstp->rq_resp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
+	 || !svc_init_buffer(&rqstp->rq_defbuf, serv->sv_bufsz)) {
+		error = -ENOMEM;
+		goto failure;
+	}
+
+	serv->sv_nrthreads++;
+	if ((error = kernel_thread((int (*)(void *)) func, rqstp, 0)) < 0)
+		goto failure;
+
+	rqstp->rq_server = serv;
+	return 0;
+
+failure:
+	svc_exit_thread(rqstp);
+	return error;
+}
+
+/*
+ * Destroy an RPC server thread
+ */
+void
+svc_exit_thread(struct svc_rqst *rqstp)
+{
+	struct svc_serv	*serv = rqstp->rq_server;
+
+	svc_release_buffer(&rqstp->rq_defbuf);
+	if (rqstp->rq_resp)
+		kfree(rqstp->rq_resp);
+	if (rqstp->rq_argp)
+		kfree(rqstp->rq_argp);
+	kfree(rqstp);
+
+	/* Release the server */
+	svc_destroy(serv);
+}
+
+/*
+ * Register an RPC service with the local portmapper. To
+ * unregister a service, call this routine with proto and port == 0.
+ */
+int
+svc_register(struct svc_serv *serv, int proto, unsigned short port)
+{
+	struct svc_program	*progp;
+	unsigned long		oldsigs = 0;
+	int			i, error = 0, dummy;
+
+	progp = serv->sv_program;
+
+	dprintk("RPC: svc_register(%s, %s, %d)\n",
+		progp->pg_name, proto == IPPROTO_UDP? "udp" : "tcp", port);
+
+	if (!port) {
+		oldsigs = current->signal;
+		current->signal = 0;
+	}
+
+	for (i = 0; i < progp->pg_nvers; i++) {
+		if (progp->pg_vers[i] == NULL)
+			continue;
+		error = rpc_register(progp->pg_prog, i, proto, port, &dummy);
+		if (error < 0)
+			return error;
+		if (port && !dummy) {
+			error = -EACCES;
+			break;
+		}
+	}
+	current->signal |= oldsigs;
+	return error;
+}
+
+/*
+ * Process the RPC request.
+ */
+int
+svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
+{
+	struct svc_program	*progp;
+	struct svc_version	*versp = NULL;	/* compiler food */
+	struct svc_procedure	*procp = NULL;
+	struct svc_buf *	argp = &rqstp->rq_argbuf;
+	struct svc_buf *	resp = &rqstp->rq_resbuf;
+	kxdrproc_t		xdr;
+	u32			*bufp, *statp;
+	u32			dir, prog, vers, proc,
+				auth_stat, rpc_stat;
+
+	rpc_stat = rpc_success;
+	bufp = argp->buf;
+
+	if (argp->len < 5)
+		goto dropit;
+
+	dir  = ntohl(*bufp++);
+	vers = ntohl(*bufp++);
+
+	/* First words of reply: */
+	svc_putlong(resp, xdr_one);		/* REPLY */
+	svc_putlong(resp, xdr_zero);		/* ACCEPT */
+
+	if (dir != 0) {		/* direction != CALL */
+		serv->sv_stats->rpcbadfmt++;
+		goto dropit;			/* drop request */
+	}
+	if (vers != 2) {		/* RPC version number */
+		serv->sv_stats->rpcbadfmt++;
+		resp->buf[-1] = xdr_one;	/* REJECT */
+		svc_putlong(resp, xdr_zero);	/* RPC_MISMATCH */
+		svc_putlong(resp, xdr_two);	/* Only RPCv2 supported */
+		svc_putlong(resp, xdr_two);
+		goto error;
+	}
+
+	rqstp->rq_prog = prog = ntohl(*bufp++);	/* program number */
+	rqstp->rq_vers = vers = ntohl(*bufp++);	/* version number */
+	rqstp->rq_proc = proc = ntohl(*bufp++);	/* procedure number */
+
+	argp->buf += 5;
+	argp->len -= 5;
+
+	/*
+	 * Decode auth data, and add verifier to reply buffer.
+	 * We do this before anything else in order to get a decent
+	 * auth verifier.
+	 */
+	svc_authenticate(rqstp, &rpc_stat, &auth_stat);
+
+	if (rpc_stat != rpc_success) {
+		serv->sv_stats->rpcbadfmt++;
+		svc_putlong(resp, rpc_garbage_args);
+		goto error;
+	}
+
+	if (auth_stat != rpc_auth_ok) {
+		dprintk("svc: authentication failed (%ld)\n", ntohl(auth_stat));
+		serv->sv_stats->rpcbadauth++;
+		resp->buf[-1] = xdr_one;	/* REJECT */
+		svc_putlong(resp, xdr_one);	/* AUTH_ERROR */
+		svc_putlong(resp, auth_stat);	/* status */
+		goto error;
+		return svc_send(rqstp);
+	}
+
+	progp = serv->sv_program;
+	if (prog != progp->pg_prog) {
+		dprintk("svc: unknown program %d (me %d)\n", prog, progp->pg_prog);
+		serv->sv_stats->rpcbadfmt++;
+		svc_putlong(resp, rpc_prog_unavail);
+		goto error;
+		return svc_send(rqstp);
+	}
+
+	versp = progp->pg_vers[vers];
+	if (!versp || vers >= progp->pg_nvers) {
+		dprintk("svc: unknown version (%d)\n", vers);
+		serv->sv_stats->rpcbadfmt++;
+		svc_putlong(resp, rpc_prog_mismatch);
+		svc_putlong(resp, htonl(progp->pg_lovers));
+		svc_putlong(resp, htonl(progp->pg_hivers));
+		goto error;
+		return svc_send(rqstp);
+	}
+
+	procp = versp->vs_proc + proc;
+	if (proc >= versp->vs_nproc || !procp->pc_func) {
+		dprintk("svc: unknown procedure (%d)\n", proc);
+		serv->sv_stats->rpcbadfmt++;
+		svc_putlong(resp, rpc_proc_unavail);
+		goto error;
+		return svc_send(rqstp);
+	}
+	rqstp->rq_server   = serv;
+	rqstp->rq_procinfo = procp;
+
+	/* Syntactic check complete */
+	serv->sv_stats->rpccnt++;
+
+	/* Build the reply header. */
+	statp = resp->buf;
+	svc_putlong(resp, rpc_success);		/* RPC_SUCCESS */
+
+	/* Bump per-procedure stats counter */
+	procp->pc_count++;
+
+	/* Initialize storage for argp and resp */
+	memset(rqstp->rq_argp, 0, procp->pc_argsize);
+	memset(rqstp->rq_resp, 0, procp->pc_ressize);
+
+	/* Call the function that processes the request. */
+	if (!versp->vs_dispatch) {
+		/* Decode arguments */
+		xdr = procp->pc_decode;
+		if (xdr && !xdr(rqstp, rqstp->rq_argbuf.buf, rqstp->rq_argp)) {
+			dprintk("svc: failed to decode args\n");
+			serv->sv_stats->rpcbadfmt++;
+			svc_putlong(resp, rpc_garbage_args);
+			goto error;
+		}
+
+		*statp = procp->pc_func(rqstp,
+					rqstp->rq_argp,
+					rqstp->rq_resp);
+
+		/* Encode reply */
+		if (*statp == rpc_success && (xdr = procp->pc_encode)
+		 && !xdr(rqstp, rqstp->rq_resbuf.buf, rqstp->rq_resp)) {
+			dprintk("svc: failed to encode reply\n");
+			/* serv->sv_stats->rpcsystemerr++; */
+			*statp = rpc_system_err;
+		}
+	} else {
+		dprintk("svc: calling dispatcher\n");
+		if (!versp->vs_dispatch(rqstp, statp))
+			goto dropit;
+	}
+
+	/* Check RPC status result */
+	if (*statp != rpc_success)
+		resp->len = statp + 1 - resp->base;
+
+	/* Release reply info */
+	if (procp->pc_release)
+		procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+
+	if (procp->pc_encode != NULL)
+		return svc_send(rqstp);
+
+dropit:
+	dprintk("svc: svc_process dropit\n");
+	svc_drop(rqstp);
+	return 0;
+
+error:
+	return svc_send(rqstp);
+}