1 /* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 2009, Sun Microsystems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
34 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
37 #if defined(LIBC_SCCS) && !defined(lint)
38 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI"
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
44 * svc_dg.c, Server side for connectionless RPC.
47 #include <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
52 #include <sys/mutex.h>
53 #include <sys/protosw.h>
54 #include <sys/queue.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
58 #include <sys/systm.h>
65 #include <rpc/rpc_com.h>
67 static enum xprt_stat svc_dg_stat(SVCXPRT *);
68 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *,
69 struct sockaddr **, struct mbuf **);
70 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *,
71 struct sockaddr *, struct mbuf *, uint32_t *);
72 static void svc_dg_destroy(SVCXPRT *);
73 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
74 static int svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
76 static struct xp_ops svc_dg_ops = {
77 .xp_recv = svc_dg_recv,
78 .xp_stat = svc_dg_stat,
79 .xp_reply = svc_dg_reply,
80 .xp_destroy = svc_dg_destroy,
81 .xp_control = svc_dg_control,
86 * xprt = svc_dg_create(sock, sendsize, recvsize);
87 * Does other connectionless specific initializations.
88 * Once *xprt is initialized, it is registered.
89 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
90 * system defaults are chosen.
91 * The routines returns NULL if a problem occurred.
93 static const char svc_dg_str[] = "svc_dg_create: %s";
94 static const char svc_dg_err1[] = "could not get transport information";
95 static const char svc_dg_err2[] = "transport does not support data transfer";
96 static const char __no_mem_str[] = "out of memory";
99 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
103 struct __rpc_sockinfo si;
107 if (!__rpc_socket2sockinfo(so, &si)) {
108 printf(svc_dg_str, svc_dg_err1);
112 * Find the receive and the send size
114 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
115 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
116 if ((sendsize == 0) || (recvsize == 0)) {
117 printf(svc_dg_str, svc_dg_err2);
121 xprt = svc_xprt_alloc();
122 sx_init(&xprt->xp_lock, "xprt->xp_lock");
123 xprt->xp_pool = pool;
124 xprt->xp_socket = so;
127 xprt->xp_ops = &svc_dg_ops;
129 CURVNET_SET(so->so_vnet);
130 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
135 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
140 SOCKBUF_LOCK(&so->so_rcv);
141 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
142 SOCKBUF_UNLOCK(&so->so_rcv);
146 (void) printf(svc_dg_str, __no_mem_str);
153 static enum xprt_stat
154 svc_dg_stat(SVCXPRT *xprt)
157 if (soreadable(xprt->xp_socket))
158 return (XPRT_MOREREQS);
164 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
165 struct sockaddr **addrp, struct mbuf **mp)
168 struct sockaddr *raddr;
174 * Serialise access to the socket.
176 sx_xlock(&xprt->xp_lock);
179 * The socket upcall calls xprt_active() which will eventually
180 * cause the server to call us here. We attempt to read a
181 * packet from the socket and process it. If the read fails,
182 * we have drained all pending requests so we call
185 uio.uio_resid = 1000000000;
186 uio.uio_td = curthread;
188 rcvflag = MSG_DONTWAIT;
189 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
191 if (error == EWOULDBLOCK) {
193 * We must re-test for readability after taking the
194 * lock to protect us in the case where a new packet
195 * arrives on the socket after our call to soreceive
196 * fails with EWOULDBLOCK. The pool lock protects us
197 * from racing the upcall after our soreadable() call
200 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
201 if (!soreadable(xprt->xp_socket))
202 xprt_inactive_self(xprt);
203 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
204 sx_xunlock(&xprt->xp_lock);
209 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
210 soupcall_clear(xprt->xp_socket, SO_RCV);
211 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
212 xprt_inactive_self(xprt);
213 sx_xunlock(&xprt->xp_lock);
217 sx_xunlock(&xprt->xp_lock);
219 xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
220 if (! xdr_callmsg(&xdrs, msg)) {
226 *mp = xdrmbuf_getall(&xdrs);
233 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
234 struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
241 mrep = m_gethdr(M_WAITOK, MT_DATA);
243 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
245 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
246 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
247 if (!xdr_replymsg(&xdrs, msg))
250 xdrmbuf_append(&xdrs, m);
252 stat = xdr_replymsg(&xdrs, msg);
257 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
273 svc_dg_destroy(SVCXPRT *xprt)
276 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
277 soupcall_clear(xprt->xp_socket, SO_RCV);
278 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
280 sx_destroy(&xprt->xp_lock);
282 (void)soclose(xprt->xp_socket);
285 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
291 svc_dg_control(xprt, rq, in)
301 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
303 SVCXPRT *xprt = (SVCXPRT *) arg;