2 * linux/net/sunrpc/svc.c
4 * High-level RPC service routines
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 #define __KERNEL_SYSCALLS__
10 #include <linux/linkage.h>
11 #include <linux/sched.h>
12 #include <linux/errno.h>
13 #include <linux/net.h>
15 #include <linux/unistd.h>
17 #include <linux/sunrpc/types.h>
18 #include <linux/sunrpc/xdr.h>
19 #include <linux/sunrpc/stats.h>
20 #include <linux/sunrpc/svcsock.h>
21 #include <linux/sunrpc/clnt.h>
23 #define RPCDBG_FACILITY RPCDBG_SVCDSP
24 #define RPC_PARANOIA 1
27 * Create an RPC service
30 svc_create(struct svc_program *prog, unsigned int bufsize, unsigned int xdrsize)
32 struct svc_serv *serv;
34 if (!(serv = (struct svc_serv *) kmalloc(sizeof(*serv), GFP_KERNEL)))
37 memset(serv, 0, sizeof(*serv));
38 serv->sv_program = prog;
39 serv->sv_nrthreads = 1;
40 serv->sv_stats = prog->pg_stats;
41 serv->sv_bufsz = bufsize? bufsize : 4096;
42 serv->sv_xdrsize = xdrsize;
43 INIT_LIST_HEAD(&serv->sv_threads);
44 INIT_LIST_HEAD(&serv->sv_sockets);
45 INIT_LIST_HEAD(&serv->sv_tempsocks);
46 INIT_LIST_HEAD(&serv->sv_permsocks);
47 spin_lock_init(&serv->sv_lock);
49 serv->sv_name = prog->pg_name;
51 /* Remove any stale portmap registrations */
52 svc_register(serv, 0, 0);
58 * Destroy an RPC service
61 svc_destroy(struct svc_serv *serv)
63 struct svc_sock *svsk;
65 dprintk("RPC: svc_destroy(%s, %d)\n",
66 serv->sv_program->pg_name,
69 if (serv->sv_nrthreads) {
70 if (--(serv->sv_nrthreads) != 0) {
71 svc_sock_update_bufs(serv);
75 printk("svc_destroy: no threads for serv=%p!\n", serv);
77 while (!list_empty(&serv->sv_tempsocks)) {
78 svsk = list_entry(serv->sv_tempsocks.next,
81 svc_delete_socket(svsk);
83 while (!list_empty(&serv->sv_permsocks)) {
84 svsk = list_entry(serv->sv_permsocks.next,
87 svc_delete_socket(svsk);
90 /* Unregister service with the portmapper */
91 svc_register(serv, 0, 0);
96 * Allocate an RPC server buffer
97 * Later versions may do nifty things by allocating multiple pages
98 * of memory directly and putting them into the bufp->iov.
101 svc_init_buffer(struct svc_buf *bufp, unsigned int size)
103 if (!(bufp->area = (u32 *) kmalloc(size, GFP_KERNEL)))
105 bufp->base = bufp->area;
106 bufp->buf = bufp->area;
108 bufp->buflen = size >> 2;
110 bufp->iov[0].iov_base = bufp->area;
111 bufp->iov[0].iov_len = size;
118 * Release an RPC server buffer
121 svc_release_buffer(struct svc_buf *bufp)
128 * Create a server thread
131 svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
133 struct svc_rqst *rqstp;
136 rqstp = kmalloc(sizeof(*rqstp), GFP_KERNEL);
140 memset(rqstp, 0, sizeof(*rqstp));
141 init_waitqueue_head(&rqstp->rq_wait);
143 if (!(rqstp->rq_argp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
144 || !(rqstp->rq_resp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
145 || !svc_init_buffer(&rqstp->rq_defbuf, serv->sv_bufsz))
148 serv->sv_nrthreads++;
149 rqstp->rq_server = serv;
150 error = kernel_thread((int (*)(void *)) func, rqstp, 0);
153 svc_sock_update_bufs(serv);
159 svc_exit_thread(rqstp);
164 * Destroy an RPC server thread
167 svc_exit_thread(struct svc_rqst *rqstp)
169 struct svc_serv *serv = rqstp->rq_server;
171 svc_release_buffer(&rqstp->rq_defbuf);
173 kfree(rqstp->rq_resp);
175 kfree(rqstp->rq_argp);
178 /* Release the server */
184 * Register an RPC service with the local portmapper.
185 * To unregister a service, call this routine with
186 * proto and port == 0.
189 svc_register(struct svc_serv *serv, int proto, unsigned short port)
191 struct svc_program *progp;
193 int i, error = 0, dummy;
195 progp = serv->sv_program;
197 dprintk("RPC: svc_register(%s, %s, %d)\n",
198 progp->pg_name, proto == IPPROTO_UDP? "udp" : "tcp", port);
201 current->sigpending = 0;
203 for (i = 0; i < progp->pg_nvers; i++) {
204 if (progp->pg_vers[i] == NULL)
206 error = rpc_register(progp->pg_prog, i, proto, port, &dummy);
209 if (port && !dummy) {
216 spin_lock_irqsave(¤t->sigmask_lock, flags);
217 recalc_sigpending(current);
218 spin_unlock_irqrestore(¤t->sigmask_lock, flags);
225 * Process the RPC request.
228 svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
230 struct svc_program *progp;
231 struct svc_version *versp = NULL; /* compiler food */
232 struct svc_procedure *procp = NULL;
233 struct svc_buf * argp = &rqstp->rq_argbuf;
234 struct svc_buf * resp = &rqstp->rq_resbuf;
237 u32 dir, prog, vers, proc,
240 rpc_stat = rpc_success;
246 dir = ntohl(*bufp++);
247 vers = ntohl(*bufp++);
249 /* First words of reply: */
250 svc_putlong(resp, xdr_one); /* REPLY */
251 svc_putlong(resp, xdr_zero); /* ACCEPT */
253 if (dir != 0) /* direction != CALL */
255 if (vers != 2) /* RPC version number */
258 rqstp->rq_prog = prog = ntohl(*bufp++); /* program number */
259 rqstp->rq_vers = vers = ntohl(*bufp++); /* version number */
260 rqstp->rq_proc = proc = ntohl(*bufp++); /* procedure number */
265 /* Used by nfsd to only allow the NULL procedure for amd. */
266 if (rqstp->rq_auth && !rqstp->rq_client && proc) {
267 auth_stat = rpc_autherr_badcred;
272 * Decode auth data, and add verifier to reply buffer.
273 * We do this before anything else in order to get a decent
276 svc_authenticate(rqstp, &rpc_stat, &auth_stat);
278 if (rpc_stat != rpc_success)
281 if (auth_stat != rpc_auth_ok)
284 progp = serv->sv_program;
285 if (prog != progp->pg_prog)
288 if (vers >= progp->pg_nvers ||
289 !(versp = progp->pg_vers[vers]))
292 procp = versp->vs_proc + proc;
293 if (proc >= versp->vs_nproc || !procp->pc_func)
295 rqstp->rq_server = serv;
296 rqstp->rq_procinfo = procp;
298 /* Syntactic check complete */
299 serv->sv_stats->rpccnt++;
301 /* Build the reply header. */
303 svc_putlong(resp, rpc_success); /* RPC_SUCCESS */
305 /* Bump per-procedure stats counter */
308 /* Initialize storage for argp and resp */
309 memset(rqstp->rq_argp, 0, procp->pc_argsize);
310 memset(rqstp->rq_resp, 0, procp->pc_ressize);
312 /* un-reserve some of the out-queue now that we have a
313 * better idea of reply size
315 if (procp->pc_xdrressize)
316 svc_reserve(rqstp, procp->pc_xdrressize<<2);
318 /* Call the function that processes the request. */
319 if (!versp->vs_dispatch) {
320 /* Decode arguments */
321 xdr = procp->pc_decode;
322 if (xdr && !xdr(rqstp, rqstp->rq_argbuf.buf, rqstp->rq_argp))
325 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
328 if (*statp == rpc_success && (xdr = procp->pc_encode)
329 && !xdr(rqstp, rqstp->rq_resbuf.buf, rqstp->rq_resp)) {
330 dprintk("svc: failed to encode reply\n");
331 /* serv->sv_stats->rpcsystemerr++; */
332 *statp = rpc_system_err;
335 dprintk("svc: calling dispatcher\n");
336 if (!versp->vs_dispatch(rqstp, statp)) {
337 /* Release reply info */
338 if (procp->pc_release)
339 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
344 /* Check RPC status result */
345 if (*statp != rpc_success)
346 resp->len = statp + 1 - resp->base;
348 /* Release reply info */
349 if (procp->pc_release)
350 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
352 if (procp->pc_encode == NULL)
355 return svc_send(rqstp);
358 dprintk("svc: svc_process dropit\n");
364 printk("svc: short len %d, dropping request\n", argp->len);
366 goto dropit; /* drop request */
370 printk("svc: bad direction %d, dropping request\n", dir);
372 serv->sv_stats->rpcbadfmt++;
373 goto dropit; /* drop request */
376 serv->sv_stats->rpcbadfmt++;
377 resp->buf[-1] = xdr_one; /* REJECT */
378 svc_putlong(resp, xdr_zero); /* RPC_MISMATCH */
379 svc_putlong(resp, xdr_two); /* Only RPCv2 supported */
380 svc_putlong(resp, xdr_two);
384 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
385 serv->sv_stats->rpcbadauth++;
386 resp->buf[-1] = xdr_one; /* REJECT */
387 svc_putlong(resp, xdr_one); /* AUTH_ERROR */
388 svc_putlong(resp, auth_stat); /* status */
393 if (prog != 100227 || progp->pg_prog != 100003)
394 printk("svc: unknown program %d (me %d)\n", prog, progp->pg_prog);
395 /* else it is just a Solaris client seeing if ACLs are supported */
397 serv->sv_stats->rpcbadfmt++;
398 svc_putlong(resp, rpc_prog_unavail);
404 printk("svc: unknown version (%d)\n", vers);
406 serv->sv_stats->rpcbadfmt++;
407 svc_putlong(resp, rpc_prog_mismatch);
408 svc_putlong(resp, htonl(progp->pg_lovers));
409 svc_putlong(resp, htonl(progp->pg_hivers));
414 printk("svc: unknown procedure (%d)\n", proc);
416 serv->sv_stats->rpcbadfmt++;
417 svc_putlong(resp, rpc_proc_unavail);
422 printk("svc: failed to decode args\n");
424 serv->sv_stats->rpcbadfmt++;
425 svc_putlong(resp, rpc_garbage_args);