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 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
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.
17 *
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
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /*
32 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
33 */
34
35 #if defined(LIBC_SCCS) && !defined(lint)
36 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI"
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: releng/10.3/sys/rpc/svc_dg.c 261055 2014-01-22 23:55:25Z mav $");
40
41 /*
42 * svc_dg.c, Server side for connectionless RPC.
43 */
44
45 #include <sys/param.h>
46 #include <sys/lock.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/mbuf.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>
55 #include <sys/sx.h>
56 #include <sys/systm.h>
57 #include <sys/uio.h>
58
59 #include <net/vnet.h>
60
61 #include <rpc/rpc.h>
62
63 #include <rpc/rpc_com.h>
64
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);
73
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,
80 };
81
82 /*
83 * Usage:
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.
90 */
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";
95
96 SVCXPRT *
97 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
98 size_t recvsize)
99 {
100 SVCXPRT *xprt;
101 struct __rpc_sockinfo si;
102 struct sockaddr* sa;
103 int error;
104
105 if (!__rpc_socket2sockinfo(so, &si)) {
106 printf(svc_dg_str, svc_dg_err1);
107 return (NULL);
108 }
109 /*
110 * Find the receive and the send size
111 */
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);
116 return (NULL);
117 }
118
119 xprt = svc_xprt_alloc();
120 sx_init(&xprt->xp_lock, "xprt->xp_lock");
121 xprt->xp_pool = pool;
122 xprt->xp_socket = so;
123 xprt->xp_p1 = NULL;
124 xprt->xp_p2 = NULL;
125 xprt->xp_ops = &svc_dg_ops;
126
127 CURVNET_SET(so->so_vnet);
128 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
129 CURVNET_RESTORE();
130 if (error)
131 goto freedata;
132
133 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
134 free(sa, M_SONAME);
135
136 xprt_register(xprt);
137
138 SOCKBUF_LOCK(&so->so_rcv);
139 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
140 SOCKBUF_UNLOCK(&so->so_rcv);
141
142 return (xprt);
143 freedata:
144 (void) printf(svc_dg_str, __no_mem_str);
145 if (xprt) {
146 svc_xprt_free(xprt);
147 }
148 return (NULL);
149 }
150
151 /*ARGSUSED*/
152 static enum xprt_stat
153 svc_dg_stat(SVCXPRT *xprt)
154 {
155
156 if (soreadable(xprt->xp_socket))
157 return (XPRT_MOREREQS);
158
159 return (XPRT_IDLE);
160 }
161
162 static bool_t
163 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
164 struct sockaddr **addrp, struct mbuf **mp)
165 {
166 struct uio uio;
167 struct sockaddr *raddr;
168 struct mbuf *mreq;
169 XDR xdrs;
170 int error, rcvflag;
171
172 /*
173 * Serialise access to the socket.
174 */
175 sx_xlock(&xprt->xp_lock);
176
177 /*
178 * The socket upcall calls xprt_active() which will eventually
179 * cause the server to call us here. We attempt to read a
180 * packet from the socket and process it. If the read fails,
181 * we have drained all pending requests so we call
182 * xprt_inactive().
183 */
184 uio.uio_resid = 1000000000;
185 uio.uio_td = curthread;
186 mreq = NULL;
187 rcvflag = MSG_DONTWAIT;
188 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
189
190 if (error == EWOULDBLOCK) {
191 /*
192 * We must re-test for readability after taking the
193 * lock to protect us in the case where a new packet
194 * arrives on the socket after our call to soreceive
195 * fails with EWOULDBLOCK. The pool lock protects us
196 * from racing the upcall after our soreadable() call
197 * returns false.
198 */
199 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
200 if (!soreadable(xprt->xp_socket))
201 xprt_inactive_self(xprt);
202 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
203 sx_xunlock(&xprt->xp_lock);
204 return (FALSE);
205 }
206
207 if (error) {
208 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
209 soupcall_clear(xprt->xp_socket, SO_RCV);
210 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
211 xprt_inactive_self(xprt);
212 sx_xunlock(&xprt->xp_lock);
213 return (FALSE);
214 }
215
216 sx_xunlock(&xprt->xp_lock);
217
218 xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
219 if (! xdr_callmsg(&xdrs, msg)) {
220 XDR_DESTROY(&xdrs);
221 return (FALSE);
222 }
223
224 *addrp = raddr;
225 *mp = xdrmbuf_getall(&xdrs);
226 XDR_DESTROY(&xdrs);
227
228 return (TRUE);
229 }
230
231 static bool_t
232 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
233 struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
234 {
235 XDR xdrs;
236 struct mbuf *mrep;
237 bool_t stat = TRUE;
238 int error;
239
240 mrep = m_gethdr(M_WAITOK, MT_DATA);
241
242 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
243
244 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
245 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
246 if (!xdr_replymsg(&xdrs, msg))
247 stat = FALSE;
248 else
249 xdrmbuf_append(&xdrs, m);
250 } else {
251 stat = xdr_replymsg(&xdrs, msg);
252 }
253
254 if (stat) {
255 m_fixhdr(mrep);
256 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
257 0, curthread);
258 if (!error) {
259 stat = TRUE;
260 }
261 } else {
262 m_freem(mrep);
263 }
264
265 XDR_DESTROY(&xdrs);
266 xprt->xp_p2 = NULL;
267
268 return (stat);
269 }
270
271 static void
272 svc_dg_destroy(SVCXPRT *xprt)
273 {
274
275 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
276 soupcall_clear(xprt->xp_socket, SO_RCV);
277 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
278
279 sx_destroy(&xprt->xp_lock);
280 if (xprt->xp_socket)
281 (void)soclose(xprt->xp_socket);
282
283 if (xprt->xp_netid)
284 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
285 svc_xprt_free(xprt);
286 }
287
288 static bool_t
289 /*ARGSUSED*/
290 svc_dg_control(xprt, rq, in)
291 SVCXPRT *xprt;
292 const u_int rq;
293 void *in;
294 {
295
296 return (FALSE);
297 }
298
299 static int
300 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
301 {
302 SVCXPRT *xprt = (SVCXPRT *) arg;
303
304 xprt_active(xprt);
305 return (SU_OK);
306 }
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