1 /* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */
4 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
32 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
35 #if defined(LIBC_SCCS) && !defined(lint)
36 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI"
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 * svc_dg.c, Server side for connectionless RPC.
45 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
50 #include <sys/mutex.h>
51 #include <sys/protosw.h>
52 #include <sys/queue.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
56 #include <sys/systm.h>
63 #include <rpc/rpc_com.h>
65 static enum xprt_stat svc_dg_stat(SVCXPRT *);
66 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *,
67 struct sockaddr **, struct mbuf **);
68 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *,
69 struct sockaddr *, struct mbuf *, uint32_t *);
70 static void svc_dg_destroy(SVCXPRT *);
71 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
72 static int svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
74 static struct xp_ops svc_dg_ops = {
75 .xp_recv = svc_dg_recv,
76 .xp_stat = svc_dg_stat,
77 .xp_reply = svc_dg_reply,
78 .xp_destroy = svc_dg_destroy,
79 .xp_control = svc_dg_control,
84 * xprt = svc_dg_create(sock, sendsize, recvsize);
85 * Does other connectionless specific initializations.
86 * Once *xprt is initialized, it is registered.
87 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
88 * system defaults are chosen.
89 * The routines returns NULL if a problem occurred.
91 static const char svc_dg_str[] = "svc_dg_create: %s";
92 static const char svc_dg_err1[] = "could not get transport information";
93 static const char svc_dg_err2[] = "transport does not support data transfer";
94 static const char __no_mem_str[] = "out of memory";
97 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
101 struct __rpc_sockinfo si;
105 if (!__rpc_socket2sockinfo(so, &si)) {
106 printf(svc_dg_str, svc_dg_err1);
110 * Find the receive and the send size
112 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
113 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
114 if ((sendsize == 0) || (recvsize == 0)) {
115 printf(svc_dg_str, svc_dg_err2);
119 xprt = svc_xprt_alloc();
120 sx_init(&xprt->xp_lock, "xprt->xp_lock");
121 xprt->xp_pool = pool;
122 xprt->xp_socket = so;
125 xprt->xp_ops = &svc_dg_ops;
127 CURVNET_SET(so->so_vnet);
128 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
133 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
138 SOCKBUF_LOCK(&so->so_rcv);
139 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
140 SOCKBUF_UNLOCK(&so->so_rcv);
144 (void) printf(svc_dg_str, __no_mem_str);
151 static enum xprt_stat
152 svc_dg_stat(SVCXPRT *xprt)
155 if (soreadable(xprt->xp_socket))
156 return (XPRT_MOREREQS);
162 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
163 struct sockaddr **addrp, struct mbuf **mp)
166 struct sockaddr *raddr;
172 * Serialise access to the socket.
174 sx_xlock(&xprt->xp_lock);
177 * The socket upcall calls xprt_active() which will eventually
178 * cause the server to call us here. We attempt to read a
179 * packet from the socket and process it. If the read fails,
180 * we have drained all pending requests so we call
183 uio.uio_resid = 1000000000;
184 uio.uio_td = curthread;
186 rcvflag = MSG_DONTWAIT;
187 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
189 if (error == EWOULDBLOCK) {
191 * We must re-test for readability after taking the
192 * lock to protect us in the case where a new packet
193 * arrives on the socket after our call to soreceive
194 * fails with EWOULDBLOCK. The pool lock protects us
195 * from racing the upcall after our soreadable() call
198 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
199 if (!soreadable(xprt->xp_socket))
200 xprt_inactive_self(xprt);
201 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
202 sx_xunlock(&xprt->xp_lock);
207 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
208 soupcall_clear(xprt->xp_socket, SO_RCV);
209 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
210 xprt_inactive_self(xprt);
211 sx_xunlock(&xprt->xp_lock);
215 sx_xunlock(&xprt->xp_lock);
217 xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
218 if (! xdr_callmsg(&xdrs, msg)) {
224 *mp = xdrmbuf_getall(&xdrs);
231 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
232 struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
239 mrep = m_gethdr(M_WAITOK, MT_DATA);
241 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
243 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
244 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
245 if (!xdr_replymsg(&xdrs, msg))
248 xdrmbuf_append(&xdrs, m);
250 stat = xdr_replymsg(&xdrs, msg);
255 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
271 svc_dg_destroy(SVCXPRT *xprt)
274 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
275 soupcall_clear(xprt->xp_socket, SO_RCV);
276 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
278 sx_destroy(&xprt->xp_lock);
280 (void)soclose(xprt->xp_socket);
283 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
289 svc_dg_control(xprt, rq, in)
299 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
301 SVCXPRT *xprt = (SVCXPRT *) arg;