FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_dg.c
1 /* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * All rights reserved.
8 *
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.
19 *
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.
31 */
32
33 /*
34 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
35 */
36
37 #if defined(LIBC_SCCS) && !defined(lint)
38 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI"
39 #endif
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 /*
44 * svc_dg.c, Server side for connectionless RPC.
45 */
46
47 #include <sys/param.h>
48 #include <sys/lock.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.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>
57 #include <sys/sx.h>
58 #include <sys/systm.h>
59 #include <sys/uio.h>
60
61 #include <net/vnet.h>
62
63 #include <rpc/rpc.h>
64
65 #include <rpc/rpc_com.h>
66
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);
75
76 static const 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,
82 };
83
84 /*
85 * Usage:
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.
92 */
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";
97
98 SVCXPRT *
99 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
100 size_t recvsize)
101 {
102 SVCXPRT *xprt;
103 struct __rpc_sockinfo si;
104 struct sockaddr* sa;
105 int error;
106
107 if (!__rpc_socket2sockinfo(so, &si)) {
108 printf(svc_dg_str, svc_dg_err1);
109 return (NULL);
110 }
111 /*
112 * Find the receive and the send size
113 */
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);
118 return (NULL);
119 }
120
121 xprt = svc_xprt_alloc();
122 sx_init(&xprt->xp_lock, "xprt->xp_lock");
123 xprt->xp_pool = pool;
124 xprt->xp_socket = so;
125 xprt->xp_p1 = NULL;
126 xprt->xp_p2 = NULL;
127 xprt->xp_ops = &svc_dg_ops;
128
129 CURVNET_SET(so->so_vnet);
130 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
131 CURVNET_RESTORE();
132 if (error)
133 goto freedata;
134
135 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
136 free(sa, M_SONAME);
137
138 xprt_register(xprt);
139
140 SOCKBUF_LOCK(&so->so_rcv);
141 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
142 SOCKBUF_UNLOCK(&so->so_rcv);
143
144 return (xprt);
145 freedata:
146 (void) printf(svc_dg_str, __no_mem_str);
147 svc_xprt_free(xprt);
148
149 return (NULL);
150 }
151
152 /*ARGSUSED*/
153 static enum xprt_stat
154 svc_dg_stat(SVCXPRT *xprt)
155 {
156
157 if (soreadable(xprt->xp_socket))
158 return (XPRT_MOREREQS);
159
160 return (XPRT_IDLE);
161 }
162
163 static bool_t
164 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
165 struct sockaddr **addrp, struct mbuf **mp)
166 {
167 struct uio uio;
168 struct sockaddr *raddr;
169 struct mbuf *mreq;
170 XDR xdrs;
171 int error, rcvflag;
172
173 /*
174 * Serialise access to the socket.
175 */
176 sx_xlock(&xprt->xp_lock);
177
178 /*
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
183 * xprt_inactive().
184 */
185 uio.uio_resid = 1000000000;
186 uio.uio_td = curthread;
187 mreq = NULL;
188 rcvflag = MSG_DONTWAIT;
189 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
190
191 if (error == EWOULDBLOCK) {
192 /*
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
198 * returns false.
199 */
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);
205 return (FALSE);
206 }
207
208 if (error) {
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);
214 return (FALSE);
215 }
216
217 sx_xunlock(&xprt->xp_lock);
218
219 xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
220 if (! xdr_callmsg(&xdrs, msg)) {
221 XDR_DESTROY(&xdrs);
222 return (FALSE);
223 }
224
225 *addrp = raddr;
226 *mp = xdrmbuf_getall(&xdrs);
227 XDR_DESTROY(&xdrs);
228
229 return (TRUE);
230 }
231
232 static bool_t
233 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
234 struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
235 {
236 XDR xdrs;
237 struct mbuf *mrep;
238 bool_t stat = TRUE;
239 int error;
240
241 mrep = m_gethdr(M_WAITOK, MT_DATA);
242
243 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
244
245 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
246 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
247 if (!xdr_replymsg(&xdrs, msg))
248 stat = FALSE;
249 else
250 xdrmbuf_append(&xdrs, m);
251 } else {
252 stat = xdr_replymsg(&xdrs, msg);
253 }
254
255 if (stat) {
256 m_fixhdr(mrep);
257 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
258 0, curthread);
259 if (!error) {
260 stat = TRUE;
261 }
262 } else {
263 m_freem(mrep);
264 }
265
266 XDR_DESTROY(&xdrs);
267 xprt->xp_p2 = NULL;
268
269 return (stat);
270 }
271
272 static void
273 svc_dg_destroy(SVCXPRT *xprt)
274 {
275
276 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
277 soupcall_clear(xprt->xp_socket, SO_RCV);
278 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
279
280 sx_destroy(&xprt->xp_lock);
281 if (xprt->xp_socket)
282 (void)soclose(xprt->xp_socket);
283
284 if (xprt->xp_netid)
285 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
286 svc_xprt_free(xprt);
287 }
288
289 static bool_t
290 /*ARGSUSED*/
291 svc_dg_control(xprt, rq, in)
292 SVCXPRT *xprt;
293 const u_int rq;
294 void *in;
295 {
296
297 return (FALSE);
298 }
299
300 static int
301 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
302 {
303 SVCXPRT *xprt = (SVCXPRT *) arg;
304
305 xprt_active(xprt);
306 return (SU_OK);
307 }
Cache object: 2ee357bacc84b83da9f6a20ccdb3593e
|