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 /* 42 * svc_dg.c, Server side for connectionless RPC. 43 */ 44 45 #include <sys/param.h> 46 #include <sys/jail.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/proc.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 (jailed(curthread->td_ucred)) 108 return (NULL); 109 if (!__rpc_socket2sockinfo(so, &si)) { 110 printf(svc_dg_str, svc_dg_err1); 111 return (NULL); 112 } 113 /* 114 * Find the receive and the send size 115 */ 116 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 117 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 118 if ((sendsize == 0) || (recvsize == 0)) { 119 printf(svc_dg_str, svc_dg_err2); 120 return (NULL); 121 } 122 123 xprt = svc_xprt_alloc(); 124 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 125 xprt->xp_pool = pool; 126 xprt->xp_socket = so; 127 xprt->xp_p1 = NULL; 128 xprt->xp_p2 = NULL; 129 xprt->xp_ops = &svc_dg_ops; 130 131 CURVNET_SET(so->so_vnet); 132 error = so->so_proto->pr_sockaddr(so, &sa); 133 CURVNET_RESTORE(); 134 if (error) 135 goto freedata; 136 137 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 138 free(sa, M_SONAME); 139 140 xprt_register(xprt); 141 142 SOCKBUF_LOCK(&so->so_rcv); 143 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt); 144 SOCKBUF_UNLOCK(&so->so_rcv); 145 146 return (xprt); 147 freedata: 148 (void) printf(svc_dg_str, __no_mem_str); 149 svc_xprt_free(xprt); 150 151 return (NULL); 152 } 153 154 /*ARGSUSED*/ 155 static enum xprt_stat 156 svc_dg_stat(SVCXPRT *xprt) 157 { 158 159 if (soreadable(xprt->xp_socket)) 160 return (XPRT_MOREREQS); 161 162 return (XPRT_IDLE); 163 } 164 165 static bool_t 166 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg, 167 struct sockaddr **addrp, struct mbuf **mp) 168 { 169 struct uio uio; 170 struct sockaddr *raddr; 171 struct mbuf *mreq; 172 XDR xdrs; 173 int error, rcvflag; 174 175 /* 176 * Serialise access to the socket. 177 */ 178 sx_xlock(&xprt->xp_lock); 179 180 /* 181 * The socket upcall calls xprt_active() which will eventually 182 * cause the server to call us here. We attempt to read a 183 * packet from the socket and process it. If the read fails, 184 * we have drained all pending requests so we call 185 * xprt_inactive(). 186 */ 187 uio.uio_resid = 1000000000; 188 uio.uio_td = curthread; 189 mreq = NULL; 190 rcvflag = MSG_DONTWAIT; 191 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag); 192 193 if (error == EWOULDBLOCK) { 194 /* 195 * We must re-test for readability after taking the 196 * lock to protect us in the case where a new packet 197 * arrives on the socket after our call to soreceive 198 * fails with EWOULDBLOCK. The pool lock protects us 199 * from racing the upcall after our soreadable() call 200 * returns false. 201 */ 202 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 203 if (!soreadable(xprt->xp_socket)) 204 xprt_inactive_self(xprt); 205 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 206 sx_xunlock(&xprt->xp_lock); 207 return (FALSE); 208 } 209 210 if (error) { 211 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 212 soupcall_clear(xprt->xp_socket, SO_RCV); 213 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 214 xprt_inactive_self(xprt); 215 sx_xunlock(&xprt->xp_lock); 216 return (FALSE); 217 } 218 219 sx_xunlock(&xprt->xp_lock); 220 221 xdrmbuf_create(&xdrs, mreq, XDR_DECODE); 222 if (! xdr_callmsg(&xdrs, msg)) { 223 XDR_DESTROY(&xdrs); 224 return (FALSE); 225 } 226 227 *addrp = raddr; 228 *mp = xdrmbuf_getall(&xdrs); 229 XDR_DESTROY(&xdrs); 230 231 return (TRUE); 232 } 233 234 static bool_t 235 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg, 236 struct sockaddr *addr, struct mbuf *m, uint32_t *seq) 237 { 238 XDR xdrs; 239 struct mbuf *mrep; 240 bool_t stat = TRUE; 241 int error; 242 243 mrep = m_gethdr(M_WAITOK, MT_DATA); 244 245 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 246 247 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 248 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 249 if (!xdr_replymsg(&xdrs, msg)) 250 stat = FALSE; 251 else 252 xdrmbuf_append(&xdrs, m); 253 } else { 254 stat = xdr_replymsg(&xdrs, msg); 255 } 256 257 if (stat) { 258 m_fixhdr(mrep); 259 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL, 260 0, curthread); 261 if (!error) { 262 stat = TRUE; 263 } 264 } else { 265 m_freem(mrep); 266 } 267 268 XDR_DESTROY(&xdrs); 269 xprt->xp_p2 = NULL; 270 271 return (stat); 272 } 273 274 static void 275 svc_dg_destroy(SVCXPRT *xprt) 276 { 277 278 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 279 soupcall_clear(xprt->xp_socket, SO_RCV); 280 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 281 282 sx_destroy(&xprt->xp_lock); 283 if (xprt->xp_socket) 284 (void)soclose(xprt->xp_socket); 285 286 if (xprt->xp_netid) 287 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1); 288 svc_xprt_free(xprt); 289 } 290 291 static bool_t 292 /*ARGSUSED*/ 293 svc_dg_control(SVCXPRT *xprt, const u_int rq, 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 } 307