Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_pcb.c
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1 /* 2 * Copyright (c) 1995, Mike Mitchell 3 * Copyright (c) 1984, 1985, 1986, 1987, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)ipx_pcb.c 35 * 36 * $FreeBSD: src/sys/netipx/ipx_pcb.c,v 1.5.4.2 1999/09/05 08:19:01 peter Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/proc.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 46 #include <net/if.h> 47 #include <net/route.h> 48 49 #include <netipx/ipx.h> 50 #include <netipx/ipx_if.h> 51 #include <netipx/ipx_pcb.h> 52 #include <netipx/ipx_var.h> 53 54 struct ipx_addr zeroipx_addr; 55 56 int 57 ipx_pcballoc(so, head) 58 struct socket *so; 59 struct ipxpcb *head; 60 { 61 struct mbuf *m; 62 register struct ipxpcb *ipxp; 63 64 m = m_getclr(M_DONTWAIT, MT_PCB); 65 if (m == NULL) 66 return (ENOBUFS); 67 ipxp = mtod(m, struct ipxpcb *); 68 ipxp->ipxp_socket = so; 69 insque(ipxp, head); 70 so->so_pcb = (caddr_t)ipxp; 71 return (0); 72 } 73 74 int 75 ipx_pcbbind(ipxp, nam) 76 register struct ipxpcb *ipxp; 77 struct mbuf *nam; 78 { 79 register struct sockaddr_ipx *sipx; 80 u_short lport = 0; 81 82 if (ipxp->ipxp_lport || !ipx_nullhost(ipxp->ipxp_laddr)) 83 return (EINVAL); 84 if (nam == NULL) 85 goto noname; 86 sipx = mtod(nam, struct sockaddr_ipx *); 87 if (nam->m_len != sizeof(*sipx)) 88 return (EINVAL); 89 if (!ipx_nullhost(sipx->sipx_addr)) { 90 int tport = sipx->sipx_port; 91 92 sipx->sipx_port = 0; /* yech... */ 93 if (ifa_ifwithaddr((struct sockaddr *)sipx) == 0) 94 return (EADDRNOTAVAIL); 95 sipx->sipx_port = tport; 96 } 97 lport = sipx->sipx_port; 98 if (lport) { 99 u_short aport = ntohs(lport); 100 101 if (aport < IPXPORT_RESERVED && 102 (ipxp->ipxp_socket->so_state & SS_PRIV) == 0) 103 return (EACCES); 104 if (ipx_pcblookup(&zeroipx_addr, lport, 0)) 105 return (EADDRINUSE); 106 } 107 ipxp->ipxp_laddr = sipx->sipx_addr; 108 noname: 109 if (lport == 0) 110 do { 111 ipxpcb.ipxp_lport++; 112 if ((ipxpcb.ipxp_lport < IPXPORT_RESERVED) || 113 (ipxpcb.ipxp_lport >= IPXPORT_WELLKNOWN)) 114 ipxpcb.ipxp_lport = IPXPORT_RESERVED; 115 lport = htons(ipxpcb.ipxp_lport); 116 } while (ipx_pcblookup(&zeroipx_addr, lport, 0)); 117 ipxp->ipxp_lport = lport; 118 return (0); 119 } 120 121 /* 122 * Connect from a socket to a specified address. 123 * Both address and port must be specified in argument sipx. 124 * If don't have a local address for this socket yet, 125 * then pick one. 126 */ 127 int 128 ipx_pcbconnect(ipxp, nam) 129 struct ipxpcb *ipxp; 130 struct mbuf *nam; 131 { 132 struct ipx_ifaddr *ia; 133 register struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *); 134 register struct ipx_addr *dst; 135 register struct route *ro; 136 struct ifnet *ifp; 137 138 ia = NULL; 139 140 if (nam->m_len != sizeof(*sipx)) 141 return (EINVAL); 142 if (sipx->sipx_family != AF_IPX) 143 return (EAFNOSUPPORT); 144 if (sipx->sipx_port == 0 || ipx_nullhost(sipx->sipx_addr)) 145 return (EADDRNOTAVAIL); 146 /* 147 * If we haven't bound which network number to use as ours, 148 * we will use the number of the outgoing interface. 149 * This depends on having done a routing lookup, which 150 * we will probably have to do anyway, so we might 151 * as well do it now. On the other hand if we are 152 * sending to multiple destinations we may have already 153 * done the lookup, so see if we can use the route 154 * from before. In any case, we only 155 * chose a port number once, even if sending to multiple 156 * destinations. 157 */ 158 ro = &ipxp->ipxp_route; 159 dst = &satoipx_addr(ro->ro_dst); 160 if (ipxp->ipxp_socket->so_options & SO_DONTROUTE) 161 goto flush; 162 if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) 163 goto flush; 164 if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) { 165 if (ro->ro_rt != NULL && !(ro->ro_rt->rt_flags & RTF_HOST)) { 166 /* can patch route to avoid rtalloc */ 167 *dst = sipx->sipx_addr; 168 } else { 169 flush: 170 if (ro->ro_rt != NULL) 171 RTFREE(ro->ro_rt); 172 ro->ro_rt = NULL; 173 ipxp->ipxp_laddr.x_net = ipx_zeronet; 174 } 175 }/* else cached route is ok; do nothing */ 176 ipxp->ipxp_lastdst = sipx->sipx_addr; 177 if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 178 (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) { 179 /* No route yet, so try to acquire one */ 180 ro->ro_dst.sa_family = AF_IPX; 181 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 182 *dst = sipx->sipx_addr; 183 dst->x_port = 0; 184 rtalloc(ro); 185 } 186 if (ipx_neteqnn(ipxp->ipxp_laddr.x_net, ipx_zeronet)) { 187 /* 188 * If route is known or can be allocated now, 189 * our src addr is taken from the i/f, else punt. 190 */ 191 192 /* 193 * If we found a route, use the address 194 * corresponding to the outgoing interface 195 */ 196 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL) 197 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next) 198 if (ia->ia_ifp == ifp) 199 break; 200 if (ia == NULL) { 201 u_short fport = sipx->sipx_addr.x_port; 202 sipx->sipx_addr.x_port = 0; 203 ia = (struct ipx_ifaddr *) 204 ifa_ifwithdstaddr((struct sockaddr *)sipx); 205 sipx->sipx_addr.x_port = fport; 206 if (ia == NULL) 207 ia = ipx_iaonnetof(&sipx->sipx_addr); 208 if (ia == NULL) 209 ia = ipx_ifaddr; 210 if (ia == NULL) 211 return (EADDRNOTAVAIL); 212 } 213 ipxp->ipxp_laddr.x_net = satoipx_addr(ia->ia_addr).x_net; 214 } 215 if (ipx_nullhost(ipxp->ipxp_laddr)) { 216 /* 217 * If route is known or can be allocated now, 218 * our src addr is taken from the i/f, else punt. 219 */ 220 221 /* 222 * If we found a route, use the address 223 * corresponding to the outgoing interface 224 */ 225 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL) 226 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next) 227 if (ia->ia_ifp == ifp) 228 break; 229 if (ia == NULL) { 230 u_short fport = sipx->sipx_addr.x_port; 231 sipx->sipx_addr.x_port = 0; 232 ia = (struct ipx_ifaddr *) 233 ifa_ifwithdstaddr((struct sockaddr *)sipx); 234 sipx->sipx_addr.x_port = fport; 235 if (ia == NULL) 236 ia = ipx_iaonnetof(&sipx->sipx_addr); 237 if (ia == NULL) 238 ia = ipx_ifaddr; 239 if (ia == NULL) 240 return (EADDRNOTAVAIL); 241 } 242 ipxp->ipxp_laddr.x_host = satoipx_addr(ia->ia_addr).x_host; 243 } 244 if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0)) 245 return (EADDRINUSE); 246 if (ipxp->ipxp_lport == 0) 247 ipx_pcbbind(ipxp, (struct mbuf *)NULL); 248 249 /* XXX just leave it zero if we can't find a route */ 250 251 ipxp->ipxp_faddr = sipx->sipx_addr; 252 /* Includes ipxp->ipxp_fport = sipx->sipx_port; */ 253 return (0); 254 } 255 256 void 257 ipx_pcbdisconnect(ipxp) 258 struct ipxpcb *ipxp; 259 { 260 261 ipxp->ipxp_faddr = zeroipx_addr; 262 if (ipxp->ipxp_socket->so_state & SS_NOFDREF) 263 ipx_pcbdetach(ipxp); 264 } 265 266 void 267 ipx_pcbdetach(ipxp) 268 struct ipxpcb *ipxp; 269 { 270 struct socket *so = ipxp->ipxp_socket; 271 272 so->so_pcb = 0; 273 sofree(so); 274 if (ipxp->ipxp_route.ro_rt != NULL) 275 rtfree(ipxp->ipxp_route.ro_rt); 276 remque(ipxp); 277 m_free(dtom(ipxp)); 278 } 279 280 void 281 ipx_setsockaddr(ipxp, nam) 282 register struct ipxpcb *ipxp; 283 struct mbuf *nam; 284 { 285 register struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *); 286 287 nam->m_len = sizeof(*sipx); 288 sipx = mtod(nam, struct sockaddr_ipx *); 289 bzero((caddr_t)sipx, sizeof(*sipx)); 290 sipx->sipx_len = sizeof(*sipx); 291 sipx->sipx_family = AF_IPX; 292 sipx->sipx_addr = ipxp->ipxp_laddr; 293 } 294 295 void 296 ipx_setpeeraddr(ipxp, nam) 297 register struct ipxpcb *ipxp; 298 struct mbuf *nam; 299 { 300 register struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *); 301 302 nam->m_len = sizeof(*sipx); 303 sipx = mtod(nam, struct sockaddr_ipx *); 304 bzero((caddr_t)sipx, sizeof(*sipx)); 305 sipx->sipx_len = sizeof(*sipx); 306 sipx->sipx_family = AF_IPX; 307 sipx->sipx_addr = ipxp->ipxp_faddr; 308 } 309 310 /* 311 * Pass some notification to all connections of a protocol 312 * associated with address dst. Call the 313 * protocol specific routine to handle each connection. 314 * Also pass an extra paramter via the ipxpcb. (which may in fact 315 * be a parameter list!) 316 */ 317 void 318 ipx_pcbnotify(dst, errno, notify, param) 319 register struct ipx_addr *dst; 320 int errno; 321 void (*notify)(struct ipxpcb *); 322 long param; 323 { 324 register struct ipxpcb *ipxp, *oinp; 325 int s = splimp(); 326 327 for (ipxp = (&ipxpcb)->ipxp_next; ipxp != (&ipxpcb);) { 328 if (!ipx_hosteq(*dst,ipxp->ipxp_faddr)) { 329 next: 330 ipxp = ipxp->ipxp_next; 331 continue; 332 } 333 if (ipxp->ipxp_socket == 0) 334 goto next; 335 if (errno) 336 ipxp->ipxp_socket->so_error = errno; 337 oinp = ipxp; 338 ipxp = ipxp->ipxp_next; 339 oinp->ipxp_notify_param = param; 340 (*notify)(oinp); 341 } 342 splx(s); 343 } 344 345 #ifdef notdef 346 /* 347 * After a routing change, flush old routing 348 * and allocate a (hopefully) better one. 349 */ 350 ipx_rtchange(ipxp) 351 struct ipxpcb *ipxp; 352 { 353 if (ipxp->ipxp_route.ro_rt != NULL) { 354 rtfree(ipxp->ipxp_route.ro_rt); 355 ipxp->ipxp_route.ro_rt = NULL; 356 /* 357 * A new route can be allocated the next time 358 * output is attempted. 359 */ 360 } 361 /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 362 } 363 #endif 364 365 struct ipxpcb * 366 ipx_pcblookup(faddr, lport, wildp) 367 struct ipx_addr *faddr; 368 u_short lport; 369 int wildp; 370 { 371 register struct ipxpcb *ipxp, *match = 0; 372 int matchwild = 3, wildcard; 373 u_short fport; 374 375 fport = faddr->x_port; 376 for (ipxp = (&ipxpcb)->ipxp_next; ipxp != (&ipxpcb); ipxp = ipxp->ipxp_next) { 377 if (ipxp->ipxp_lport != lport) 378 continue; 379 wildcard = 0; 380 if (ipx_nullhost(ipxp->ipxp_faddr)) { 381 if (!ipx_nullhost(*faddr)) 382 wildcard++; 383 } else { 384 if (ipx_nullhost(*faddr)) 385 wildcard++; 386 else { 387 if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr)) 388 continue; 389 if (ipxp->ipxp_fport != fport) { 390 if (ipxp->ipxp_fport != 0) 391 continue; 392 else 393 wildcard++; 394 } 395 } 396 } 397 if (wildcard && wildp == 0) 398 continue; 399 if (wildcard < matchwild) { 400 match = ipxp; 401 matchwild = wildcard; 402 if (wildcard == 0) 403 break; 404 } 405 } 406 return (match); 407 }
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