![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
491 lines
11 KiB
C
491 lines
11 KiB
C
/*
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* linux/net/sunrpc/svc.c
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*
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* High-level RPC service routines
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/linkage.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/net.h>
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#include <linux/in.h>
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#include <linux/mm.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/clnt.h>
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#define RPCDBG_FACILITY RPCDBG_SVCDSP
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#define RPC_PARANOIA 1
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/*
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* Create an RPC service
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*/
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struct svc_serv *
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svc_create(struct svc_program *prog, unsigned int bufsize)
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{
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struct svc_serv *serv;
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int vers;
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unsigned int xdrsize;
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if (!(serv = (struct svc_serv *) kmalloc(sizeof(*serv), GFP_KERNEL)))
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return NULL;
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memset(serv, 0, sizeof(*serv));
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serv->sv_program = prog;
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serv->sv_nrthreads = 1;
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serv->sv_stats = prog->pg_stats;
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serv->sv_bufsz = bufsize? bufsize : 4096;
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prog->pg_lovers = prog->pg_nvers-1;
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xdrsize = 0;
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for (vers=0; vers<prog->pg_nvers ; vers++)
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if (prog->pg_vers[vers]) {
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prog->pg_hivers = vers;
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if (prog->pg_lovers > vers)
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prog->pg_lovers = vers;
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if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
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xdrsize = prog->pg_vers[vers]->vs_xdrsize;
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}
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serv->sv_xdrsize = xdrsize;
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INIT_LIST_HEAD(&serv->sv_threads);
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INIT_LIST_HEAD(&serv->sv_sockets);
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INIT_LIST_HEAD(&serv->sv_tempsocks);
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INIT_LIST_HEAD(&serv->sv_permsocks);
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spin_lock_init(&serv->sv_lock);
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serv->sv_name = prog->pg_name;
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/* Remove any stale portmap registrations */
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svc_register(serv, 0, 0);
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return serv;
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}
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/*
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* Destroy an RPC service
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*/
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void
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svc_destroy(struct svc_serv *serv)
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{
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struct svc_sock *svsk;
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dprintk("RPC: svc_destroy(%s, %d)\n",
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serv->sv_program->pg_name,
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serv->sv_nrthreads);
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if (serv->sv_nrthreads) {
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if (--(serv->sv_nrthreads) != 0) {
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svc_sock_update_bufs(serv);
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return;
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}
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} else
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printk("svc_destroy: no threads for serv=%p!\n", serv);
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while (!list_empty(&serv->sv_tempsocks)) {
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svsk = list_entry(serv->sv_tempsocks.next,
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struct svc_sock,
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sk_list);
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svc_delete_socket(svsk);
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}
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while (!list_empty(&serv->sv_permsocks)) {
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svsk = list_entry(serv->sv_permsocks.next,
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struct svc_sock,
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sk_list);
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svc_delete_socket(svsk);
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}
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cache_clean_deferred(serv);
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/* Unregister service with the portmapper */
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svc_register(serv, 0, 0);
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kfree(serv);
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}
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/*
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* Allocate an RPC server's buffer space.
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* We allocate pages and place them in rq_argpages.
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*/
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static int
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svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
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{
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int pages;
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int arghi;
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if (size > RPCSVC_MAXPAYLOAD)
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size = RPCSVC_MAXPAYLOAD;
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pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
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rqstp->rq_argused = 0;
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rqstp->rq_resused = 0;
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arghi = 0;
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if (pages > RPCSVC_MAXPAGES)
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BUG();
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while (pages) {
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struct page *p = alloc_page(GFP_KERNEL);
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if (!p)
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break;
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rqstp->rq_argpages[arghi++] = p;
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pages--;
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}
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rqstp->rq_arghi = arghi;
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return ! pages;
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}
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/*
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* Release an RPC server buffer
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*/
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static void
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svc_release_buffer(struct svc_rqst *rqstp)
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{
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while (rqstp->rq_arghi)
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put_page(rqstp->rq_argpages[--rqstp->rq_arghi]);
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while (rqstp->rq_resused) {
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if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
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continue;
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put_page(rqstp->rq_respages[rqstp->rq_resused]);
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}
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rqstp->rq_argused = 0;
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}
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/*
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* Create a server thread
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*/
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int
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svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
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{
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struct svc_rqst *rqstp;
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int error = -ENOMEM;
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rqstp = kmalloc(sizeof(*rqstp), GFP_KERNEL);
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if (!rqstp)
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goto out;
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memset(rqstp, 0, sizeof(*rqstp));
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init_waitqueue_head(&rqstp->rq_wait);
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if (!(rqstp->rq_argp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
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|| !(rqstp->rq_resp = (u32 *) kmalloc(serv->sv_xdrsize, GFP_KERNEL))
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|| !svc_init_buffer(rqstp, serv->sv_bufsz))
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goto out_thread;
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serv->sv_nrthreads++;
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rqstp->rq_server = serv;
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error = kernel_thread((int (*)(void *)) func, rqstp, 0);
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if (error < 0)
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goto out_thread;
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svc_sock_update_bufs(serv);
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error = 0;
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out:
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return error;
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out_thread:
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svc_exit_thread(rqstp);
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goto out;
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}
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/*
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* Destroy an RPC server thread
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*/
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void
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svc_exit_thread(struct svc_rqst *rqstp)
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{
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struct svc_serv *serv = rqstp->rq_server;
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svc_release_buffer(rqstp);
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if (rqstp->rq_resp)
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kfree(rqstp->rq_resp);
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if (rqstp->rq_argp)
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kfree(rqstp->rq_argp);
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if (rqstp->rq_auth_data)
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kfree(rqstp->rq_auth_data);
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kfree(rqstp);
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/* Release the server */
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if (serv)
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svc_destroy(serv);
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}
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/*
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* Register an RPC service with the local portmapper.
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* To unregister a service, call this routine with
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* proto and port == 0.
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*/
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int
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svc_register(struct svc_serv *serv, int proto, unsigned short port)
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{
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struct svc_program *progp;
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unsigned long flags;
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int i, error = 0, dummy;
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progp = serv->sv_program;
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dprintk("RPC: svc_register(%s, %s, %d)\n",
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progp->pg_name, proto == IPPROTO_UDP? "udp" : "tcp", port);
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if (!port)
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clear_thread_flag(TIF_SIGPENDING);
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for (i = 0; i < progp->pg_nvers; i++) {
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if (progp->pg_vers[i] == NULL)
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continue;
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error = rpc_register(progp->pg_prog, i, proto, port, &dummy);
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if (error < 0)
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break;
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if (port && !dummy) {
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error = -EACCES;
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break;
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}
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}
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if (!port) {
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spin_lock_irqsave(¤t->sighand->siglock, flags);
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recalc_sigpending();
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spin_unlock_irqrestore(¤t->sighand->siglock, flags);
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}
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return error;
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}
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/*
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* Process the RPC request.
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*/
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int
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svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
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{
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struct svc_program *progp;
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struct svc_version *versp = NULL; /* compiler food */
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struct svc_procedure *procp = NULL;
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struct kvec * argv = &rqstp->rq_arg.head[0];
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struct kvec * resv = &rqstp->rq_res.head[0];
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kxdrproc_t xdr;
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u32 *statp;
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u32 dir, prog, vers, proc,
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auth_stat, rpc_stat;
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int auth_res;
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u32 *accept_statp;
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rpc_stat = rpc_success;
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if (argv->iov_len < 6*4)
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goto err_short_len;
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/* setup response xdr_buf.
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* Initially it has just one page
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*/
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svc_take_page(rqstp); /* must succeed */
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resv->iov_base = page_address(rqstp->rq_respages[0]);
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resv->iov_len = 0;
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rqstp->rq_res.pages = rqstp->rq_respages+1;
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rqstp->rq_res.len = 0;
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rqstp->rq_res.page_base = 0;
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rqstp->rq_res.page_len = 0;
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rqstp->rq_res.tail[0].iov_len = 0;
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/* tcp needs a space for the record length... */
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if (rqstp->rq_prot == IPPROTO_TCP)
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svc_putu32(resv, 0);
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rqstp->rq_xid = svc_getu32(argv);
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svc_putu32(resv, rqstp->rq_xid);
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dir = ntohl(svc_getu32(argv));
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vers = ntohl(svc_getu32(argv));
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/* First words of reply: */
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svc_putu32(resv, xdr_one); /* REPLY */
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if (dir != 0) /* direction != CALL */
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goto err_bad_dir;
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if (vers != 2) /* RPC version number */
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goto err_bad_rpc;
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/* Save position in case we later decide to reject: */
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accept_statp = resv->iov_base + resv->iov_len;
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svc_putu32(resv, xdr_zero); /* ACCEPT */
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rqstp->rq_prog = prog = ntohl(svc_getu32(argv)); /* program number */
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rqstp->rq_vers = vers = ntohl(svc_getu32(argv)); /* version number */
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rqstp->rq_proc = proc = ntohl(svc_getu32(argv)); /* procedure number */
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progp = serv->sv_program;
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/*
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* Decode auth data, and add verifier to reply buffer.
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* We do this before anything else in order to get a decent
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* auth verifier.
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*/
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auth_res = svc_authenticate(rqstp, &auth_stat);
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/* Also give the program a chance to reject this call: */
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if (auth_res == SVC_OK) {
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auth_stat = rpc_autherr_badcred;
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auth_res = progp->pg_authenticate(rqstp);
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}
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switch (auth_res) {
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case SVC_OK:
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break;
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case SVC_GARBAGE:
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rpc_stat = rpc_garbage_args;
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goto err_bad;
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case SVC_SYSERR:
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rpc_stat = rpc_system_err;
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goto err_bad;
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case SVC_DENIED:
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goto err_bad_auth;
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case SVC_DROP:
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goto dropit;
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case SVC_COMPLETE:
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goto sendit;
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}
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if (prog != progp->pg_prog)
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goto err_bad_prog;
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if (vers >= progp->pg_nvers ||
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!(versp = progp->pg_vers[vers]))
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goto err_bad_vers;
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procp = versp->vs_proc + proc;
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if (proc >= versp->vs_nproc || !procp->pc_func)
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goto err_bad_proc;
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rqstp->rq_server = serv;
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rqstp->rq_procinfo = procp;
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/* Syntactic check complete */
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serv->sv_stats->rpccnt++;
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/* Build the reply header. */
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statp = resv->iov_base +resv->iov_len;
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svc_putu32(resv, rpc_success); /* RPC_SUCCESS */
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/* Bump per-procedure stats counter */
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procp->pc_count++;
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/* Initialize storage for argp and resp */
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memset(rqstp->rq_argp, 0, procp->pc_argsize);
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memset(rqstp->rq_resp, 0, procp->pc_ressize);
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/* un-reserve some of the out-queue now that we have a
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* better idea of reply size
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*/
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if (procp->pc_xdrressize)
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svc_reserve(rqstp, procp->pc_xdrressize<<2);
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/* Call the function that processes the request. */
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if (!versp->vs_dispatch) {
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/* Decode arguments */
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xdr = procp->pc_decode;
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if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
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goto err_garbage;
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*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
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/* Encode reply */
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if (*statp == rpc_success && (xdr = procp->pc_encode)
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&& !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
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dprintk("svc: failed to encode reply\n");
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/* serv->sv_stats->rpcsystemerr++; */
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*statp = rpc_system_err;
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}
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} else {
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dprintk("svc: calling dispatcher\n");
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if (!versp->vs_dispatch(rqstp, statp)) {
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/* Release reply info */
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if (procp->pc_release)
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procp->pc_release(rqstp, NULL, rqstp->rq_resp);
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goto dropit;
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}
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}
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/* Check RPC status result */
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if (*statp != rpc_success)
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resv->iov_len = ((void*)statp) - resv->iov_base + 4;
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/* Release reply info */
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if (procp->pc_release)
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procp->pc_release(rqstp, NULL, rqstp->rq_resp);
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if (procp->pc_encode == NULL)
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goto dropit;
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sendit:
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if (svc_authorise(rqstp))
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goto dropit;
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return svc_send(rqstp);
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dropit:
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svc_authorise(rqstp); /* doesn't hurt to call this twice */
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dprintk("svc: svc_process dropit\n");
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svc_drop(rqstp);
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return 0;
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err_short_len:
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#ifdef RPC_PARANOIA
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printk("svc: short len %Zd, dropping request\n", argv->iov_len);
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#endif
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goto dropit; /* drop request */
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err_bad_dir:
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#ifdef RPC_PARANOIA
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printk("svc: bad direction %d, dropping request\n", dir);
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#endif
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serv->sv_stats->rpcbadfmt++;
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goto dropit; /* drop request */
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err_bad_rpc:
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serv->sv_stats->rpcbadfmt++;
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svc_putu32(resv, xdr_one); /* REJECT */
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svc_putu32(resv, xdr_zero); /* RPC_MISMATCH */
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svc_putu32(resv, xdr_two); /* Only RPCv2 supported */
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svc_putu32(resv, xdr_two);
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goto sendit;
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err_bad_auth:
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dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
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serv->sv_stats->rpcbadauth++;
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/* Restore write pointer to location of accept status: */
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xdr_ressize_check(rqstp, accept_statp);
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svc_putu32(resv, xdr_one); /* REJECT */
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svc_putu32(resv, xdr_one); /* AUTH_ERROR */
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svc_putu32(resv, auth_stat); /* status */
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goto sendit;
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err_bad_prog:
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#ifdef RPC_PARANOIA
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if (prog != 100227 || progp->pg_prog != 100003)
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printk("svc: unknown program %d (me %d)\n", prog, progp->pg_prog);
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/* else it is just a Solaris client seeing if ACLs are supported */
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#endif
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serv->sv_stats->rpcbadfmt++;
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svc_putu32(resv, rpc_prog_unavail);
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goto sendit;
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err_bad_vers:
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#ifdef RPC_PARANOIA
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printk("svc: unknown version (%d)\n", vers);
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#endif
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serv->sv_stats->rpcbadfmt++;
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svc_putu32(resv, rpc_prog_mismatch);
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svc_putu32(resv, htonl(progp->pg_lovers));
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svc_putu32(resv, htonl(progp->pg_hivers));
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goto sendit;
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err_bad_proc:
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#ifdef RPC_PARANOIA
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printk("svc: unknown procedure (%d)\n", proc);
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#endif
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serv->sv_stats->rpcbadfmt++;
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svc_putu32(resv, rpc_proc_unavail);
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goto sendit;
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err_garbage:
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#ifdef RPC_PARANOIA
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printk("svc: failed to decode args\n");
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#endif
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rpc_stat = rpc_garbage_args;
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err_bad:
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serv->sv_stats->rpcbadfmt++;
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svc_putu32(resv, rpc_stat);
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goto sendit;
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}
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