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_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 } 308