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 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California 94043
30 */
31
32 /*
33 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI"
38 #endif
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: src/sys/rpc/svc_dg.c,v 1.3 2008/11/03 10:38:00 dfr Exp $");
41
42 /*
43 * svc_dg.c, Server side for connectionless RPC.
44 */
45
46 #include <sys/param.h>
47 #include <sys/lock.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
50 #include <sys/mbuf.h>
51 #include <sys/mutex.h>
52 #include <sys/protosw.h>
53 #include <sys/queue.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/sx.h>
57 #include <sys/systm.h>
58 #include <sys/uio.h>
59
60 #include <rpc/rpc.h>
61
62 #include <rpc/rpc_com.h>
63
64 static enum xprt_stat svc_dg_stat(SVCXPRT *);
65 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *,
66 struct sockaddr **, struct mbuf **);
67 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *,
68 struct sockaddr *, struct mbuf *);
69 static void svc_dg_destroy(SVCXPRT *);
70 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
71 static void svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
72
73 static struct xp_ops svc_dg_ops = {
74 .xp_recv = svc_dg_recv,
75 .xp_stat = svc_dg_stat,
76 .xp_reply = svc_dg_reply,
77 .xp_destroy = svc_dg_destroy,
78 .xp_control = svc_dg_control,
79 };
80
81 /*
82 * Usage:
83 * xprt = svc_dg_create(sock, sendsize, recvsize);
84 * Does other connectionless specific initializations.
85 * Once *xprt is initialized, it is registered.
86 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
87 * system defaults are chosen.
88 * The routines returns NULL if a problem occurred.
89 */
90 static const char svc_dg_str[] = "svc_dg_create: %s";
91 static const char svc_dg_err1[] = "could not get transport information";
92 static const char svc_dg_err2[] = "transport does not support data transfer";
93 static const char __no_mem_str[] = "out of memory";
94
95 SVCXPRT *
96 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
97 size_t recvsize)
98 {
99 SVCXPRT *xprt;
100 struct __rpc_sockinfo si;
101 struct sockaddr* sa;
102 int error;
103
104 if (!__rpc_socket2sockinfo(so, &si)) {
105 printf(svc_dg_str, svc_dg_err1);
106 return (NULL);
107 }
108 /*
109 * Find the receive and the send size
110 */
111 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
112 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
113 if ((sendsize == 0) || (recvsize == 0)) {
114 printf(svc_dg_str, svc_dg_err2);
115 return (NULL);
116 }
117
118 xprt = svc_xprt_alloc();
119 sx_init(&xprt->xp_lock, "xprt->xp_lock");
120 xprt->xp_pool = pool;
121 xprt->xp_socket = so;
122 xprt->xp_p1 = NULL;
123 xprt->xp_p2 = NULL;
124 xprt->xp_ops = &svc_dg_ops;
125
126 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
127 if (error)
128 goto freedata;
129
130 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
131 free(sa, M_SONAME);
132
133 xprt_register(xprt);
134
135 SOCKBUF_LOCK(&so->so_rcv);
136 so->so_upcallarg = xprt;
137 so->so_upcall = svc_dg_soupcall;
138 so->so_rcv.sb_flags |= SB_UPCALL;
139 SOCKBUF_UNLOCK(&so->so_rcv);
140
141 return (xprt);
142 freedata:
143 (void) printf(svc_dg_str, __no_mem_str);
144 if (xprt) {
145 svc_xprt_free(xprt);
146 }
147 return (NULL);
148 }
149
150 /*ARGSUSED*/
151 static enum xprt_stat
152 svc_dg_stat(SVCXPRT *xprt)
153 {
154
155 if (soreadable(xprt->xp_socket))
156 return (XPRT_MOREREQS);
157
158 return (XPRT_IDLE);
159 }
160
161 static bool_t
162 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
163 struct sockaddr **addrp, struct mbuf **mp)
164 {
165 struct uio uio;
166 struct sockaddr *raddr;
167 struct mbuf *mreq;
168 XDR xdrs;
169 int error, rcvflag;
170
171 /*
172 * Serialise access to the socket.
173 */
174 sx_xlock(&xprt->xp_lock);
175
176 /*
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
181 * xprt_inactive().
182 */
183 uio.uio_resid = 1000000000;
184 uio.uio_td = curthread;
185 mreq = NULL;
186 rcvflag = MSG_DONTWAIT;
187 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
188
189 if (error == EWOULDBLOCK) {
190 /*
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
196 * returns false.
197 */
198 mtx_lock(&xprt->xp_pool->sp_lock);
199 if (!soreadable(xprt->xp_socket))
200 xprt_inactive_locked(xprt);
201 mtx_unlock(&xprt->xp_pool->sp_lock);
202 sx_xunlock(&xprt->xp_lock);
203 return (FALSE);
204 }
205
206 if (error) {
207 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
208 xprt->xp_socket->so_upcallarg = NULL;
209 xprt->xp_socket->so_upcall = NULL;
210 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
211 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
212 xprt_inactive(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)
235 {
236 XDR xdrs;
237 struct mbuf *mrep;
238 bool_t stat = TRUE;
239 int error;
240
241 MGETHDR(mrep, M_WAIT, MT_DATA);
242 mrep->m_len = 0;
243
244 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
245
246 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
247 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
248 if (!xdr_replymsg(&xdrs, msg))
249 stat = FALSE;
250 else
251 xdrmbuf_append(&xdrs, m);
252 } else {
253 stat = xdr_replymsg(&xdrs, msg);
254 }
255
256 if (stat) {
257 m_fixhdr(mrep);
258 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
259 0, curthread);
260 if (!error) {
261 stat = TRUE;
262 }
263 } else {
264 m_freem(mrep);
265 }
266
267 XDR_DESTROY(&xdrs);
268 xprt->xp_p2 = NULL;
269
270 return (stat);
271 }
272
273 static void
274 svc_dg_destroy(SVCXPRT *xprt)
275 {
276
277 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
278 xprt->xp_socket->so_upcallarg = NULL;
279 xprt->xp_socket->so_upcall = NULL;
280 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
281 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
282
283 sx_destroy(&xprt->xp_lock);
284 if (xprt->xp_socket)
285 (void)soclose(xprt->xp_socket);
286
287 if (xprt->xp_netid)
288 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
289 svc_xprt_free(xprt);
290 }
291
292 static bool_t
293 /*ARGSUSED*/
294 svc_dg_control(xprt, rq, in)
295 SVCXPRT *xprt;
296 const u_int rq;
297 void *in;
298 {
299
300 return (FALSE);
301 }
302
303 static void
304 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
305 {
306 SVCXPRT *xprt = (SVCXPRT *) arg;
307
308 xprt_active(xprt);
309 }
310
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