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("$FreeBSD$");
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/systm.h>
57 #include <sys/uio.h>
58
59 #include <rpc/rpc.h>
60
61 #include <rpc/rpc_com.h>
62
63 static enum xprt_stat svc_dg_stat(SVCXPRT *);
64 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *);
65 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *);
66 static bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *);
67 static bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *);
68 static void svc_dg_destroy(SVCXPRT *);
69 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
70 static void svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
71
72 static struct xp_ops svc_dg_ops = {
73 .xp_recv = svc_dg_recv,
74 .xp_stat = svc_dg_stat,
75 .xp_getargs = svc_dg_getargs,
76 .xp_reply = svc_dg_reply,
77 .xp_freeargs = svc_dg_freeargs,
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 = mem_alloc(sizeof (SVCXPRT));
120 memset(xprt, 0, sizeof (SVCXPRT));
121 mtx_init(&xprt->xp_lock, "xprt->xp_lock", NULL, MTX_DEF);
122 xprt->xp_pool = pool;
123 xprt->xp_socket = so;
124 xprt->xp_p1 = NULL;
125 xprt->xp_p2 = NULL;
126 xprt->xp_ops = &svc_dg_ops;
127
128 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
129 if (error)
130 goto freedata;
131
132 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
133 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
134 xprt->xp_ltaddr.len = sa->sa_len;
135 memcpy(xprt->xp_ltaddr.buf, sa, sa->sa_len);
136 free(sa, M_SONAME);
137
138 xprt->xp_rtaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
139 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
140 xprt->xp_rtaddr.len = 0;
141
142 xprt_register(xprt);
143
144 SOCKBUF_LOCK(&so->so_rcv);
145 so->so_upcallarg = xprt;
146 so->so_upcall = svc_dg_soupcall;
147 so->so_rcv.sb_flags |= SB_UPCALL;
148 SOCKBUF_UNLOCK(&so->so_rcv);
149
150 return (xprt);
151 freedata:
152 (void) printf(svc_dg_str, __no_mem_str);
153 if (xprt) {
154 (void) mem_free(xprt, sizeof (SVCXPRT));
155 }
156 return (NULL);
157 }
158
159 /*ARGSUSED*/
160 static enum xprt_stat
161 svc_dg_stat(SVCXPRT *xprt)
162 {
163
164 return (XPRT_IDLE);
165 }
166
167 static bool_t
168 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg)
169 {
170 struct uio uio;
171 struct sockaddr *raddr;
172 struct mbuf *mreq;
173 int error, rcvflag;
174
175 /*
176 * The socket upcall calls xprt_active() which will eventually
177 * cause the server to call us here. We attempt to read a
178 * packet from the socket and process it. If the read fails,
179 * we have drained all pending requests so we call
180 * xprt_inactive().
181 *
182 * The lock protects us in the case where a new packet arrives
183 * on the socket after our call to soreceive fails with
184 * EWOULDBLOCK - the call to xprt_active() in the upcall will
185 * happen only after our call to xprt_inactive() which ensures
186 * that we will remain active. It might be possible to use
187 * SOCKBUF_LOCK for this - its not clear to me what locks are
188 * held during the upcall.
189 */
190 mtx_lock(&xprt->xp_lock);
191
192 uio.uio_resid = 1000000000;
193 uio.uio_td = curthread;
194 mreq = NULL;
195 rcvflag = MSG_DONTWAIT;
196 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
197
198 if (error == EWOULDBLOCK) {
199 xprt_inactive(xprt);
200 mtx_unlock(&xprt->xp_lock);
201 return (FALSE);
202 }
203
204 if (error) {
205 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
206 xprt->xp_socket->so_upcallarg = NULL;
207 xprt->xp_socket->so_upcall = NULL;
208 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
209 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
210 xprt_inactive(xprt);
211 mtx_unlock(&xprt->xp_lock);
212 return (FALSE);
213 }
214
215 mtx_unlock(&xprt->xp_lock);
216
217 KASSERT(raddr->sa_len < xprt->xp_rtaddr.maxlen,
218 ("Unexpected remote address length"));
219 memcpy(xprt->xp_rtaddr.buf, raddr, raddr->sa_len);
220 xprt->xp_rtaddr.len = raddr->sa_len;
221 free(raddr, M_SONAME);
222
223 xdrmbuf_create(&xprt->xp_xdrreq, mreq, XDR_DECODE);
224 if (! xdr_callmsg(&xprt->xp_xdrreq, msg)) {
225 XDR_DESTROY(&xprt->xp_xdrreq);
226 return (FALSE);
227 }
228 xprt->xp_xid = msg->rm_xid;
229
230 return (TRUE);
231 }
232
233 static bool_t
234 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg)
235 {
236 struct mbuf *mrep;
237 bool_t stat = FALSE;
238 int error;
239
240 MGETHDR(mrep, M_WAIT, MT_DATA);
241 MCLGET(mrep, M_WAIT);
242 mrep->m_len = 0;
243
244 xdrmbuf_create(&xprt->xp_xdrrep, mrep, XDR_ENCODE);
245 msg->rm_xid = xprt->xp_xid;
246 if (xdr_replymsg(&xprt->xp_xdrrep, msg)) {
247 m_fixhdr(mrep);
248 error = sosend(xprt->xp_socket,
249 (struct sockaddr *) xprt->xp_rtaddr.buf, NULL, mrep, NULL,
250 0, curthread);
251 if (!error) {
252 stat = TRUE;
253 }
254 } else {
255 m_freem(mrep);
256 }
257
258 /*
259 * This frees the request mbuf chain as well. The reply mbuf
260 * chain was consumed by sosend.
261 */
262 XDR_DESTROY(&xprt->xp_xdrreq);
263 XDR_DESTROY(&xprt->xp_xdrrep);
264 xprt->xp_p2 = NULL;
265
266 return (stat);
267 }
268
269 static bool_t
270 svc_dg_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
271 {
272
273 return (xdr_args(&xprt->xp_xdrreq, args_ptr));
274 }
275
276 static bool_t
277 svc_dg_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
278 {
279 XDR xdrs;
280
281 /*
282 * Free the request mbuf here - this allows us to handle
283 * protocols where not all requests have replies
284 * (i.e. NLM). Note that xdrmbuf_destroy handles being called
285 * twice correctly - the mbuf will only be freed once.
286 */
287 XDR_DESTROY(&xprt->xp_xdrreq);
288
289 xdrs.x_op = XDR_FREE;
290 return (xdr_args(&xdrs, args_ptr));
291 }
292
293 static void
294 svc_dg_destroy(SVCXPRT *xprt)
295 {
296 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
297 xprt->xp_socket->so_upcallarg = NULL;
298 xprt->xp_socket->so_upcall = NULL;
299 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
300 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
301
302 xprt_unregister(xprt);
303
304 mtx_destroy(&xprt->xp_lock);
305 if (xprt->xp_socket)
306 (void)soclose(xprt->xp_socket);
307
308 if (xprt->xp_rtaddr.buf)
309 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
310 if (xprt->xp_ltaddr.buf)
311 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
312 (void) mem_free(xprt, sizeof (SVCXPRT));
313 }
314
315 static bool_t
316 /*ARGSUSED*/
317 svc_dg_control(xprt, rq, in)
318 SVCXPRT *xprt;
319 const u_int rq;
320 void *in;
321 {
322
323 return (FALSE);
324 }
325
326 static void
327 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
328 {
329 SVCXPRT *xprt = (SVCXPRT *) arg;
330
331 mtx_lock(&xprt->xp_lock);
332 xprt_active(xprt);
333 mtx_unlock(&xprt->xp_lock);
334 }
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