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>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
53 #include <sys/mutex.h>
55 #include <sys/protosw.h>
56 #include <sys/queue.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
60 #include <sys/systm.h>
67 #include <rpc/rpc_com.h>
69 static enum xprt_stat svc_dg_stat(SVCXPRT *);
70 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *,
71 struct sockaddr **, struct mbuf **);
72 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *,
73 struct sockaddr *, struct mbuf *, uint32_t *);
74 static void svc_dg_destroy(SVCXPRT *);
75 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
76 static int svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
78 static const struct xp_ops svc_dg_ops = {
79 .xp_recv = svc_dg_recv,
80 .xp_stat = svc_dg_stat,
81 .xp_reply = svc_dg_reply,
82 .xp_destroy = svc_dg_destroy,
83 .xp_control = svc_dg_control,
88 * xprt = svc_dg_create(sock, sendsize, recvsize);
89 * Does other connectionless specific initializations.
90 * Once *xprt is initialized, it is registered.
91 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
92 * system defaults are chosen.
93 * The routines returns NULL if a problem occurred.
95 static const char svc_dg_str[] = "svc_dg_create: %s";
96 static const char svc_dg_err1[] = "could not get transport information";
97 static const char svc_dg_err2[] = "transport does not support data transfer";
98 static const char __no_mem_str[] = "out of memory";
101 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
105 struct __rpc_sockinfo si;
109 if (jailed(curthread->td_ucred))
111 if (!__rpc_socket2sockinfo(so, &si)) {
112 printf(svc_dg_str, svc_dg_err1);
116 * Find the receive and the send size
118 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
119 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
120 if ((sendsize == 0) || (recvsize == 0)) {
121 printf(svc_dg_str, svc_dg_err2);
125 xprt = svc_xprt_alloc();
126 sx_init(&xprt->xp_lock, "xprt->xp_lock");
127 xprt->xp_pool = pool;
128 xprt->xp_socket = so;
131 xprt->xp_ops = &svc_dg_ops;
133 CURVNET_SET(so->so_vnet);
134 error = so->so_proto->pr_sockaddr(so, &sa);
139 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
144 SOCKBUF_LOCK(&so->so_rcv);
145 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
146 SOCKBUF_UNLOCK(&so->so_rcv);
150 (void) printf(svc_dg_str, __no_mem_str);
157 static enum xprt_stat
158 svc_dg_stat(SVCXPRT *xprt)
161 if (soreadable(xprt->xp_socket))
162 return (XPRT_MOREREQS);
168 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
169 struct sockaddr **addrp, struct mbuf **mp)
172 struct sockaddr *raddr;
178 * Serialise access to the socket.
180 sx_xlock(&xprt->xp_lock);
183 * The socket upcall calls xprt_active() which will eventually
184 * cause the server to call us here. We attempt to read a
185 * packet from the socket and process it. If the read fails,
186 * we have drained all pending requests so we call
189 uio.uio_resid = 1000000000;
190 uio.uio_td = curthread;
192 rcvflag = MSG_DONTWAIT;
193 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
195 if (error == EWOULDBLOCK) {
197 * We must re-test for readability after taking the
198 * lock to protect us in the case where a new packet
199 * arrives on the socket after our call to soreceive
200 * fails with EWOULDBLOCK. The pool lock protects us
201 * from racing the upcall after our soreadable() call
204 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
205 if (!soreadable(xprt->xp_socket))
206 xprt_inactive_self(xprt);
207 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
208 sx_xunlock(&xprt->xp_lock);
213 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
214 soupcall_clear(xprt->xp_socket, SO_RCV);
215 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
216 xprt_inactive_self(xprt);
217 sx_xunlock(&xprt->xp_lock);
221 sx_xunlock(&xprt->xp_lock);
223 xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
224 if (! xdr_callmsg(&xdrs, msg)) {
230 *mp = xdrmbuf_getall(&xdrs);
237 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
238 struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
245 mrep = m_gethdr(M_WAITOK, MT_DATA);
247 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
249 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
250 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
251 if (!xdr_replymsg(&xdrs, msg))
254 xdrmbuf_append(&xdrs, m);
256 stat = xdr_replymsg(&xdrs, msg);
261 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
277 svc_dg_destroy(SVCXPRT *xprt)
280 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
281 soupcall_clear(xprt->xp_socket, SO_RCV);
282 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
284 sx_destroy(&xprt->xp_lock);
286 (void)soclose(xprt->xp_socket);
289 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
295 svc_dg_control(SVCXPRT *xprt, const u_int rq, void *in)
302 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
304 SVCXPRT *xprt = (SVCXPRT *) arg;