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/jail.h> 49 #include <sys/lock.h> 50 #include <sys/kernel.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/protosw.h> 56 #include <sys/queue.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sx.h> 60 #include <sys/systm.h> 61 #include <sys/uio.h> 62 63 #include <net/vnet.h> 64 65 #include <rpc/rpc.h> 66 67 #include <rpc/rpc_com.h> 68 69 static enum xprt_stat svc_dg_stat(SVCXPRT *); 70 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *, 71 struct sockaddr **, struct mbuf **); 72 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *, 73 struct sockaddr *, struct mbuf *, uint32_t *); 74 static void svc_dg_destroy(SVCXPRT *); 75 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *); 76 static int svc_dg_soupcall(struct socket *so, void *arg, int waitflag); 77 78 static const struct xp_ops svc_dg_ops = { 79 .xp_recv = svc_dg_recv, 80 .xp_stat = svc_dg_stat, 81 .xp_reply = svc_dg_reply, 82 .xp_destroy = svc_dg_destroy, 83 .xp_control = svc_dg_control, 84 }; 85 86 /* 87 * Usage: 88 * xprt = svc_dg_create(sock, sendsize, recvsize); 89 * Does other connectionless specific initializations. 90 * Once *xprt is initialized, it is registered. 91 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable 92 * system defaults are chosen. 93 * The routines returns NULL if a problem occurred. 94 */ 95 static const char svc_dg_str[] = "svc_dg_create: %s"; 96 static const char svc_dg_err1[] = "could not get transport information"; 97 static const char svc_dg_err2[] = "transport does not support data transfer"; 98 static const char __no_mem_str[] = "out of memory"; 99 100 SVCXPRT * 101 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize, 102 size_t recvsize) 103 { 104 SVCXPRT *xprt; 105 struct __rpc_sockinfo si; 106 struct sockaddr* sa; 107 int error; 108 109 if (jailed(curthread->td_ucred)) 110 return (NULL); 111 if (!__rpc_socket2sockinfo(so, &si)) { 112 printf(svc_dg_str, svc_dg_err1); 113 return (NULL); 114 } 115 /* 116 * Find the receive and the send size 117 */ 118 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 119 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 120 if ((sendsize == 0) || (recvsize == 0)) { 121 printf(svc_dg_str, svc_dg_err2); 122 return (NULL); 123 } 124 125 xprt = svc_xprt_alloc(); 126 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 127 xprt->xp_pool = pool; 128 xprt->xp_socket = so; 129 xprt->xp_p1 = NULL; 130 xprt->xp_p2 = NULL; 131 xprt->xp_ops = &svc_dg_ops; 132 133 CURVNET_SET(so->so_vnet); 134 error = so->so_proto->pr_sockaddr(so, &sa); 135 CURVNET_RESTORE(); 136 if (error) 137 goto freedata; 138 139 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 140 free(sa, M_SONAME); 141 142 xprt_register(xprt); 143 144 SOCKBUF_LOCK(&so->so_rcv); 145 soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt); 146 SOCKBUF_UNLOCK(&so->so_rcv); 147 148 return (xprt); 149 freedata: 150 (void) printf(svc_dg_str, __no_mem_str); 151 svc_xprt_free(xprt); 152 153 return (NULL); 154 } 155 156 /*ARGSUSED*/ 157 static enum xprt_stat 158 svc_dg_stat(SVCXPRT *xprt) 159 { 160 161 if (soreadable(xprt->xp_socket)) 162 return (XPRT_MOREREQS); 163 164 return (XPRT_IDLE); 165 } 166 167 static bool_t 168 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg, 169 struct sockaddr **addrp, struct mbuf **mp) 170 { 171 struct uio uio; 172 struct sockaddr *raddr; 173 struct mbuf *mreq; 174 XDR xdrs; 175 int error, rcvflag; 176 177 /* 178 * Serialise access to the socket. 179 */ 180 sx_xlock(&xprt->xp_lock); 181 182 /* 183 * The socket upcall calls xprt_active() which will eventually 184 * cause the server to call us here. We attempt to read a 185 * packet from the socket and process it. If the read fails, 186 * we have drained all pending requests so we call 187 * xprt_inactive(). 188 */ 189 uio.uio_resid = 1000000000; 190 uio.uio_td = curthread; 191 mreq = NULL; 192 rcvflag = MSG_DONTWAIT; 193 error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag); 194 195 if (error == EWOULDBLOCK) { 196 /* 197 * We must re-test for readability after taking the 198 * lock to protect us in the case where a new packet 199 * arrives on the socket after our call to soreceive 200 * fails with EWOULDBLOCK. The pool lock protects us 201 * from racing the upcall after our soreadable() call 202 * returns false. 203 */ 204 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 205 if (!soreadable(xprt->xp_socket)) 206 xprt_inactive_self(xprt); 207 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 208 sx_xunlock(&xprt->xp_lock); 209 return (FALSE); 210 } 211 212 if (error) { 213 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 214 soupcall_clear(xprt->xp_socket, SO_RCV); 215 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 216 xprt_inactive_self(xprt); 217 sx_xunlock(&xprt->xp_lock); 218 return (FALSE); 219 } 220 221 sx_xunlock(&xprt->xp_lock); 222 223 xdrmbuf_create(&xdrs, mreq, XDR_DECODE); 224 if (! xdr_callmsg(&xdrs, msg)) { 225 XDR_DESTROY(&xdrs); 226 return (FALSE); 227 } 228 229 *addrp = raddr; 230 *mp = xdrmbuf_getall(&xdrs); 231 XDR_DESTROY(&xdrs); 232 233 return (TRUE); 234 } 235 236 static bool_t 237 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg, 238 struct sockaddr *addr, struct mbuf *m, uint32_t *seq) 239 { 240 XDR xdrs; 241 struct mbuf *mrep; 242 bool_t stat = TRUE; 243 int error; 244 245 mrep = m_gethdr(M_WAITOK, MT_DATA); 246 247 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 248 249 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 250 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 251 if (!xdr_replymsg(&xdrs, msg)) 252 stat = FALSE; 253 else 254 xdrmbuf_append(&xdrs, m); 255 } else { 256 stat = xdr_replymsg(&xdrs, msg); 257 } 258 259 if (stat) { 260 m_fixhdr(mrep); 261 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL, 262 0, curthread); 263 if (!error) { 264 stat = TRUE; 265 } 266 } else { 267 m_freem(mrep); 268 } 269 270 XDR_DESTROY(&xdrs); 271 xprt->xp_p2 = NULL; 272 273 return (stat); 274 } 275 276 static void 277 svc_dg_destroy(SVCXPRT *xprt) 278 { 279 280 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 281 soupcall_clear(xprt->xp_socket, SO_RCV); 282 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 283 284 sx_destroy(&xprt->xp_lock); 285 if (xprt->xp_socket) 286 (void)soclose(xprt->xp_socket); 287 288 if (xprt->xp_netid) 289 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1); 290 svc_xprt_free(xprt); 291 } 292 293 static bool_t 294 /*ARGSUSED*/ 295 svc_dg_control(SVCXPRT *xprt, const u_int rq, void *in) 296 { 297 298 return (FALSE); 299 } 300 301 static int 302 svc_dg_soupcall(struct socket *so, void *arg, int waitflag) 303 { 304 SVCXPRT *xprt = (SVCXPRT *) arg; 305 306 xprt_active(xprt); 307 return (SU_OK); 308 } 309