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-rw-r--r--net/sunrpc/svc.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
new file mode 100644
index 00000000000..bb2d99f3331
--- /dev/null
+++ b/net/sunrpc/svc.c
@@ -0,0 +1,490 @@
+/*
+ * linux/net/sunrpc/svc.c
+ *
+ * High-level RPC service routines
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/mm.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
+#define RPC_PARANOIA 1
+
+/*
+ * Create an RPC service
+ */
+struct svc_serv *
+svc_create(struct svc_program *prog, unsigned int bufsize)
+{
+ struct svc_serv *serv;
+ int vers;
+ unsigned int xdrsize;
+
+ 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;
+ prog->pg_lovers = prog->pg_nvers-1;
+ xdrsize = 0;
+ for (vers=0; vers<prog->pg_nvers ; vers++)
+ if (prog->pg_vers[vers]) {
+ prog->pg_hivers = vers;
+ if (prog->pg_lovers > vers)
+ prog->pg_lovers = vers;
+ if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
+ xdrsize = prog->pg_vers[vers]->vs_xdrsize;
+ }
+ serv->sv_xdrsize = xdrsize;
+ INIT_LIST_HEAD(&serv->sv_threads);
+ INIT_LIST_HEAD(&serv->sv_sockets);
+ INIT_LIST_HEAD(&serv->sv_tempsocks);
+ INIT_LIST_HEAD(&serv->sv_permsocks);
+ spin_lock_init(&serv->sv_lock);
+
+ 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) {
+ if (--(serv->sv_nrthreads) != 0) {
+ svc_sock_update_bufs(serv);
+ return;
+ }
+ } else
+ printk("svc_destroy: no threads for serv=%p!\n", serv);
+
+ while (!list_empty(&serv->sv_tempsocks)) {
+ svsk = list_entry(serv->sv_tempsocks.next,
+ struct svc_sock,
+ sk_list);
+ svc_delete_socket(svsk);
+ }
+ while (!list_empty(&serv->sv_permsocks)) {
+ svsk = list_entry(serv->sv_permsocks.next,
+ struct svc_sock,
+ sk_list);
+ svc_delete_socket(svsk);
+ }
+
+ cache_clean_deferred(serv);
+
+ /* Unregister service with the portmapper */
+ svc_register(serv, 0, 0);
+ kfree(serv);
+}
+
+/*
+ * Allocate an RPC server's buffer space.
+ * We allocate pages and place them in rq_argpages.
+ */
+static int
+svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
+{
+ int pages;
+ int arghi;
+
+ if (size > RPCSVC_MAXPAYLOAD)
+ size = RPCSVC_MAXPAYLOAD;
+ pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
+ rqstp->rq_argused = 0;
+ rqstp->rq_resused = 0;
+ arghi = 0;
+ if (pages > RPCSVC_MAXPAGES)
+ BUG();
+ while (pages) {
+ struct page *p = alloc_page(GFP_KERNEL);
+ if (!p)
+ break;
+ rqstp->rq_argpages[arghi++] = p;
+ pages--;
+ }
+ rqstp->rq_arghi = arghi;
+ return ! pages;
+}
+
+/*
+ * Release an RPC server buffer
+ */
+static void
+svc_release_buffer(struct svc_rqst *rqstp)
+{
+ while (rqstp->rq_arghi)
+ put_page(rqstp->rq_argpages[--rqstp->rq_arghi]);
+ while (rqstp->rq_resused) {
+ if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
+ continue;
+ put_page(rqstp->rq_respages[rqstp->rq_resused]);
+ }
+ rqstp->rq_argused = 0;
+}
+
+/*
+ * Create a server thread
+ */
+int
+svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
+{
+ struct svc_rqst *rqstp;
+ int error = -ENOMEM;
+
+ rqstp = kmalloc(sizeof(*rqstp), GFP_KERNEL);
+ if (!rqstp)
+ goto out;
+
+ memset(rqstp, 0, sizeof(*rqstp));
+ init_waitqueue_head(&rqstp->rq_wait);
+
+ 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, serv->sv_bufsz))
+ goto out_thread;
+
+ serv->sv_nrthreads++;
+ rqstp->rq_server = serv;
+ error = kernel_thread((int (*)(void *)) func, rqstp, 0);
+ if (error < 0)
+ goto out_thread;
+ svc_sock_update_bufs(serv);
+ error = 0;
+out:
+ return error;
+
+out_thread:
+ svc_exit_thread(rqstp);
+ goto out;
+}
+
+/*
+ * Destroy an RPC server thread
+ */
+void
+svc_exit_thread(struct svc_rqst *rqstp)
+{
+ struct svc_serv *serv = rqstp->rq_server;
+
+ svc_release_buffer(rqstp);
+ if (rqstp->rq_resp)
+ kfree(rqstp->rq_resp);
+ if (rqstp->rq_argp)
+ kfree(rqstp->rq_argp);
+ if (rqstp->rq_auth_data)
+ kfree(rqstp->rq_auth_data);
+ kfree(rqstp);
+
+ /* Release the server */
+ if (serv)
+ 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 flags;
+ 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)
+ clear_thread_flag(TIF_SIGPENDING);
+
+ 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)
+ break;
+ if (port && !dummy) {
+ error = -EACCES;
+ break;
+ }
+ }
+
+ if (!port) {
+ spin_lock_irqsave(&current->sighand->siglock, flags);
+ recalc_sigpending();
+ spin_unlock_irqrestore(&current->sighand->siglock, flags);
+ }
+
+ 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 kvec * argv = &rqstp->rq_arg.head[0];
+ struct kvec * resv = &rqstp->rq_res.head[0];
+ kxdrproc_t xdr;
+ u32 *statp;
+ u32 dir, prog, vers, proc,
+ auth_stat, rpc_stat;
+ int auth_res;
+ u32 *accept_statp;
+
+ rpc_stat = rpc_success;
+
+ if (argv->iov_len < 6*4)
+ goto err_short_len;
+
+ /* setup response xdr_buf.
+ * Initially it has just one page
+ */
+ svc_take_page(rqstp); /* must succeed */
+ resv->iov_base = page_address(rqstp->rq_respages[0]);
+ resv->iov_len = 0;
+ rqstp->rq_res.pages = rqstp->rq_respages+1;
+ rqstp->rq_res.len = 0;
+ rqstp->rq_res.page_base = 0;
+ rqstp->rq_res.page_len = 0;
+ rqstp->rq_res.tail[0].iov_len = 0;
+ /* tcp needs a space for the record length... */
+ if (rqstp->rq_prot == IPPROTO_TCP)
+ svc_putu32(resv, 0);
+
+ rqstp->rq_xid = svc_getu32(argv);
+ svc_putu32(resv, rqstp->rq_xid);
+
+ dir = ntohl(svc_getu32(argv));
+ vers = ntohl(svc_getu32(argv));
+
+ /* First words of reply: */
+ svc_putu32(resv, xdr_one); /* REPLY */
+
+ if (dir != 0) /* direction != CALL */
+ goto err_bad_dir;
+ if (vers != 2) /* RPC version number */
+ goto err_bad_rpc;
+
+ /* Save position in case we later decide to reject: */
+ accept_statp = resv->iov_base + resv->iov_len;
+
+ svc_putu32(resv, xdr_zero); /* ACCEPT */
+
+ rqstp->rq_prog = prog = ntohl(svc_getu32(argv)); /* program number */
+ rqstp->rq_vers = vers = ntohl(svc_getu32(argv)); /* version number */
+ rqstp->rq_proc = proc = ntohl(svc_getu32(argv)); /* procedure number */
+
+ progp = serv->sv_program;
+ /*
+ * Decode auth data, and add verifier to reply buffer.
+ * We do this before anything else in order to get a decent
+ * auth verifier.
+ */
+ auth_res = svc_authenticate(rqstp, &auth_stat);
+ /* Also give the program a chance to reject this call: */
+ if (auth_res == SVC_OK) {
+ auth_stat = rpc_autherr_badcred;
+ auth_res = progp->pg_authenticate(rqstp);
+ }
+ switch (auth_res) {
+ case SVC_OK:
+ break;
+ case SVC_GARBAGE:
+ rpc_stat = rpc_garbage_args;
+ goto err_bad;
+ case SVC_SYSERR:
+ rpc_stat = rpc_system_err;
+ goto err_bad;
+ case SVC_DENIED:
+ goto err_bad_auth;
+ case SVC_DROP:
+ goto dropit;
+ case SVC_COMPLETE:
+ goto sendit;
+ }
+
+ if (prog != progp->pg_prog)
+ goto err_bad_prog;
+
+ if (vers >= progp->pg_nvers ||
+ !(versp = progp->pg_vers[vers]))
+ goto err_bad_vers;
+
+ procp = versp->vs_proc + proc;
+ if (proc >= versp->vs_nproc || !procp->pc_func)
+ goto err_bad_proc;
+ rqstp->rq_server = serv;
+ rqstp->rq_procinfo = procp;
+
+ /* Syntactic check complete */
+ serv->sv_stats->rpccnt++;
+
+ /* Build the reply header. */
+ statp = resv->iov_base +resv->iov_len;
+ svc_putu32(resv, 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);
+
+ /* un-reserve some of the out-queue now that we have a
+ * better idea of reply size
+ */
+ if (procp->pc_xdrressize)
+ svc_reserve(rqstp, procp->pc_xdrressize<<2);
+
+ /* Call the function that processes the request. */
+ if (!versp->vs_dispatch) {
+ /* Decode arguments */
+ xdr = procp->pc_decode;
+ if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
+ goto err_garbage;
+
+ *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
+
+ /* Encode reply */
+ if (*statp == rpc_success && (xdr = procp->pc_encode)
+ && !xdr(rqstp, resv->iov_base+resv->iov_len, 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)) {
+ /* Release reply info */
+ if (procp->pc_release)
+ procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+ goto dropit;
+ }
+ }
+
+ /* Check RPC status result */
+ if (*statp != rpc_success)
+ resv->iov_len = ((void*)statp) - resv->iov_base + 4;
+
+ /* Release reply info */
+ if (procp->pc_release)
+ procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+
+ if (procp->pc_encode == NULL)
+ goto dropit;
+
+ sendit:
+ if (svc_authorise(rqstp))
+ goto dropit;
+ return svc_send(rqstp);
+
+ dropit:
+ svc_authorise(rqstp); /* doesn't hurt to call this twice */
+ dprintk("svc: svc_process dropit\n");
+ svc_drop(rqstp);
+ return 0;
+
+err_short_len:
+#ifdef RPC_PARANOIA
+ printk("svc: short len %Zd, dropping request\n", argv->iov_len);
+#endif
+ goto dropit; /* drop request */
+
+err_bad_dir:
+#ifdef RPC_PARANOIA
+ printk("svc: bad direction %d, dropping request\n", dir);
+#endif
+ serv->sv_stats->rpcbadfmt++;
+ goto dropit; /* drop request */
+
+err_bad_rpc:
+ serv->sv_stats->rpcbadfmt++;
+ svc_putu32(resv, xdr_one); /* REJECT */
+ svc_putu32(resv, xdr_zero); /* RPC_MISMATCH */
+ svc_putu32(resv, xdr_two); /* Only RPCv2 supported */
+ svc_putu32(resv, xdr_two);
+ goto sendit;
+
+err_bad_auth:
+ dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
+ serv->sv_stats->rpcbadauth++;
+ /* Restore write pointer to location of accept status: */
+ xdr_ressize_check(rqstp, accept_statp);
+ svc_putu32(resv, xdr_one); /* REJECT */
+ svc_putu32(resv, xdr_one); /* AUTH_ERROR */
+ svc_putu32(resv, auth_stat); /* status */
+ goto sendit;
+
+err_bad_prog:
+#ifdef RPC_PARANOIA
+ if (prog != 100227 || progp->pg_prog != 100003)
+ printk("svc: unknown program %d (me %d)\n", prog, progp->pg_prog);
+ /* else it is just a Solaris client seeing if ACLs are supported */
+#endif
+ serv->sv_stats->rpcbadfmt++;
+ svc_putu32(resv, rpc_prog_unavail);
+ goto sendit;
+
+err_bad_vers:
+#ifdef RPC_PARANOIA
+ printk("svc: unknown version (%d)\n", vers);
+#endif
+ serv->sv_stats->rpcbadfmt++;
+ svc_putu32(resv, rpc_prog_mismatch);
+ svc_putu32(resv, htonl(progp->pg_lovers));
+ svc_putu32(resv, htonl(progp->pg_hivers));
+ goto sendit;
+
+err_bad_proc:
+#ifdef RPC_PARANOIA
+ printk("svc: unknown procedure (%d)\n", proc);
+#endif
+ serv->sv_stats->rpcbadfmt++;
+ svc_putu32(resv, rpc_proc_unavail);
+ goto sendit;
+
+err_garbage:
+#ifdef RPC_PARANOIA
+ printk("svc: failed to decode args\n");
+#endif
+ rpc_stat = rpc_garbage_args;
+err_bad:
+ serv->sv_stats->rpcbadfmt++;
+ svc_putu32(resv, rpc_stat);
+ goto sendit;
+}
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