sys/netproto/ipx/ipx_pcb.c

   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 1.18.2.1 2001/02/22 09:44:18 bp Exp $
  37  * $DragonFly: src/sys/netproto/ipx/ipx_pcb.c,v 1.13 2006/12/05 23:31:57 dillon Exp $
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/malloc.h>
  43 #include <sys/proc.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46 #include <sys/thread2.h>
  47
  48 #include <net/if.h>
  49 #include <net/route.h>
  50
  51 #include "ipx.h"
  52 #include "ipx_if.h"
  53 #include "ipx_pcb.h"
  54 #include "ipx_var.h"
  55
  56 static struct   ipx_addr zeroipx_addr;
  57
  58 int
  59 ipx_pcballoc(struct socket *so, struct ipxpcb *head)
  60 {
  61         struct ipxpcb *ipxp;
  62
  63         MALLOC(ipxp, struct ipxpcb *, sizeof *ipxp, M_PCB,
  64                 M_WAITOK | M_ZERO | M_NULLOK);
  65         if (ipxp == NULL)
  66                 return (ENOBUFS);
  67         ipxp->ipxp_socket = so;
  68         if (ipxcksum)
  69                 ipxp->ipxp_flags |= IPXP_CHECKSUM;
  70         insque(ipxp, head);
  71         so->so_pcb = (caddr_t)ipxp;
  72         return (0);
  73 }
  74
  75 int
  76 ipx_pcbbind(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
  77 {
  78         struct sockaddr_ipx *sipx;
  79         u_short lport = 0;
  80
  81         if (ipxp->ipxp_lport || !ipx_nullhost(ipxp->ipxp_laddr))
  82                 return (EINVAL);
  83         if (nam == NULL)
  84                 goto noname;
  85         sipx = (struct sockaddr_ipx *)nam;
  86         if (!ipx_nullhost(sipx->sipx_addr)) {
  87                 int tport = sipx->sipx_port;
  88
  89                 sipx->sipx_port = 0;            /* yech... */
  90                 if (ifa_ifwithaddr((struct sockaddr *)sipx) == 0)
  91                         return (EADDRNOTAVAIL);
  92                 sipx->sipx_port = tport;
  93         }
  94         lport = sipx->sipx_port;
  95         if (lport) {
  96                 u_short aport = ntohs(lport);
  97                 int error;
  98
  99                 if (aport < IPXPORT_RESERVED &&
 100                     td != NULL && (error = suser(td)) != 0)
 101                         return (error);
 102                 if (ipx_pcblookup(&zeroipx_addr, lport, 0))
 103                         return (EADDRINUSE);
 104         }
 105         ipxp->ipxp_laddr = sipx->sipx_addr;
 106 noname:
 107         if (lport == 0)
 108                 do {
 109                         ipxpcb.ipxp_lport++;
 110                         if ((ipxpcb.ipxp_lport < IPXPORT_RESERVED) ||
 111                             (ipxpcb.ipxp_lport >= IPXPORT_WELLKNOWN))
 112                                 ipxpcb.ipxp_lport = IPXPORT_RESERVED;
 113                         lport = htons(ipxpcb.ipxp_lport);
 114                 } while (ipx_pcblookup(&zeroipx_addr, lport, 0));
 115         ipxp->ipxp_lport = lport;
 116         return (0);
 117 }
 118
 119 /*
 120  * Connect from a socket to a specified address.
 121  * Both address and port must be specified in argument sipx.
 122  * If don't have a local address for this socket yet,
 123  * then pick one.
 124  */
 125 int
 126 ipx_pcbconnect(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
 127 {
 128         struct ipx_ifaddr *ia;
 129         struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)nam;
 130         struct ipx_addr *dst;
 131         struct route *ro;
 132         struct ifnet *ifp;
 133
 134         ia = NULL;
 135
 136         if (sipx->sipx_family != AF_IPX)
 137                 return (EAFNOSUPPORT);
 138         if (sipx->sipx_port == 0 || ipx_nullhost(sipx->sipx_addr))
 139                 return (EADDRNOTAVAIL);
 140         /*
 141          * If we haven't bound which network number to use as ours,
 142          * we will use the number of the outgoing interface.
 143          * This depends on having done a routing lookup, which
 144          * we will probably have to do anyway, so we might
 145          * as well do it now.  On the other hand if we are
 146          * sending to multiple destinations we may have already
 147          * done the lookup, so see if we can use the route
 148          * from before.  In any case, we only
 149          * chose a port number once, even if sending to multiple
 150          * destinations.
 151          */
 152         ro = &ipxp->ipxp_route;
 153         dst = &satoipx_addr(ro->ro_dst);
 154         if (ipxp->ipxp_socket->so_options & SO_DONTROUTE)
 155                 goto flush;
 156         if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr))
 157                 goto flush;
 158         if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) {
 159                 if (ro->ro_rt != NULL && !(ro->ro_rt->rt_flags & RTF_HOST)) {
 160                         /* can patch route to avoid rtalloc */
 161                         *dst = sipx->sipx_addr;
 162                 } else {
 163         flush:
 164                         if (ro->ro_rt != NULL)
 165                                 RTFREE(ro->ro_rt);
 166                         ro->ro_rt = NULL;
 167                 }
 168         }/* else cached route is ok; do nothing */
 169         ipxp->ipxp_lastdst = sipx->sipx_addr;
 170         if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
 171             (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) {
 172                     /* No route yet, so try to acquire one */
 173                     ro->ro_dst.sa_family = AF_IPX;
 174                     ro->ro_dst.sa_len = sizeof(ro->ro_dst);
 175                     *dst = sipx->sipx_addr;
 176                     dst->x_port = 0;
 177                     rtalloc(ro);
 178         }
 179         if (ipx_neteqnn(ipxp->ipxp_laddr.x_net, ipx_zeronet)) {
 180                 /*
 181                  * If route is known or can be allocated now,
 182                  * our src addr is taken from the i/f, else punt.
 183                  */
 184
 185                 /*
 186                  * If we found a route, use the address
 187                  * corresponding to the outgoing interface
 188                  */
 189                 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
 190                         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 191                                 if (ia->ia_ifp == ifp)
 192                                         break;
 193                 if (ia == NULL) {
 194                         u_short fport = sipx->sipx_addr.x_port;
 195                         sipx->sipx_addr.x_port = 0;
 196                         ia = (struct ipx_ifaddr *)
 197                                 ifa_ifwithdstaddr((struct sockaddr *)sipx);
 198                         sipx->sipx_addr.x_port = fport;
 199                         if (ia == NULL)
 200                                 ia = ipx_iaonnetof(&sipx->sipx_addr);
 201                         if (ia == NULL)
 202                                 ia = ipx_ifaddr;
 203                         if (ia == NULL)
 204                                 return (EADDRNOTAVAIL);
 205                 }
 206                 ipxp->ipxp_laddr.x_net = satoipx_addr(ia->ia_addr).x_net;
 207         }
 208         if (ipx_nullhost(ipxp->ipxp_laddr)) {
 209                 /*
 210                  * If route is known or can be allocated now,
 211                  * our src addr is taken from the i/f, else punt.
 212                  */
 213
 214                 /*
 215                  * If we found a route, use the address
 216                  * corresponding to the outgoing interface
 217                  */
 218                 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
 219                         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 220                                 if (ia->ia_ifp == ifp)
 221                                         break;
 222                 if (ia == NULL) {
 223                         u_short fport = sipx->sipx_addr.x_port;
 224                         sipx->sipx_addr.x_port = 0;
 225                         ia = (struct ipx_ifaddr *)
 226                                 ifa_ifwithdstaddr((struct sockaddr *)sipx);
 227                         sipx->sipx_addr.x_port = fport;
 228                         if (ia == NULL)
 229                                 ia = ipx_iaonnetof(&sipx->sipx_addr);
 230                         if (ia == NULL)
 231                                 ia = ipx_ifaddr;
 232                         if (ia == NULL)
 233                                 return (EADDRNOTAVAIL);
 234                 }
 235                 ipxp->ipxp_laddr.x_host = satoipx_addr(ia->ia_addr).x_host;
 236         }
 237         if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0))
 238                 return (EADDRINUSE);
 239         if (ipxp->ipxp_lport == 0)
 240                 ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
 241
 242         /* XXX just leave it zero if we can't find a route */
 243
 244         ipxp->ipxp_faddr = sipx->sipx_addr;
 245         /* Includes ipxp->ipxp_fport = sipx->sipx_port; */
 246         return (0);
 247 }
 248
 249 void
 250 ipx_pcbdisconnect(struct ipxpcb *ipxp)
 251 {
 252
 253         ipxp->ipxp_faddr = zeroipx_addr;
 254         if (ipxp->ipxp_socket->so_state & SS_NOFDREF)
 255                 ipx_pcbdetach(ipxp);
 256 }
 257
 258 void
 259 ipx_pcbdetach(struct ipxpcb *ipxp)
 260 {
 261         struct socket *so = ipxp->ipxp_socket;
 262
 263         so->so_pcb = 0;
 264         sofree(so);
 265         if (ipxp->ipxp_route.ro_rt != NULL)
 266                 rtfree(ipxp->ipxp_route.ro_rt);
 267         remque(ipxp);
 268         FREE(ipxp, M_PCB);
 269 }
 270
 271 void
 272 ipx_setsockaddr(struct ipxpcb *ipxp, struct sockaddr **nam)
 273 {
 274         struct sockaddr_ipx *sipx, ssipx;
 275
 276         sipx = &ssipx;
 277         bzero((caddr_t)sipx, sizeof(*sipx));
 278         sipx->sipx_len = sizeof(*sipx);
 279         sipx->sipx_family = AF_IPX;
 280         sipx->sipx_addr = ipxp->ipxp_laddr;
 281         *nam = dup_sockaddr((struct sockaddr *)sipx);
 282 }
 283
 284 void
 285 ipx_setpeeraddr(struct ipxpcb *ipxp, struct sockaddr **nam)
 286 {
 287         struct sockaddr_ipx *sipx, ssipx;
 288
 289         sipx = &ssipx;
 290         bzero((caddr_t)sipx, sizeof(*sipx));
 291         sipx->sipx_len = sizeof(*sipx);
 292         sipx->sipx_family = AF_IPX;
 293         sipx->sipx_addr = ipxp->ipxp_faddr;
 294         *nam = dup_sockaddr((struct sockaddr *)sipx);
 295 }
 296
 297 /*
 298  * Pass some notification to all connections of a protocol
 299  * associated with address dst.  Call the
 300  * protocol specific routine to handle each connection.
 301  * Also pass an extra paramter via the ipxpcb. (which may in fact
 302  * be a parameter list!)
 303  */
 304 void
 305 ipx_pcbnotify(struct ipx_addr *dst, int error,
 306               void (*notify)(struct ipxpcb *), long param)
 307 {
 308         struct ipxpcb *ipxp, *oinp;
 309
 310         crit_enter();
 311
 312         for (ipxp = (&ipxpcb)->ipxp_next; ipxp != (&ipxpcb);) {
 313                 if (!ipx_hosteq(*dst,ipxp->ipxp_faddr)) {
 314         next:
 315                         ipxp = ipxp->ipxp_next;
 316                         continue;
 317                 }
 318                 if (ipxp->ipxp_socket == 0)
 319                         goto next;
 320                 if (error)
 321                         ipxp->ipxp_socket->so_error = error;
 322                 oinp = ipxp;
 323                 ipxp = ipxp->ipxp_next;
 324                 oinp->ipxp_notify_param = param;
 325                 (*notify)(oinp);
 326         }
 327         crit_exit();
 328 }
 329
 330 #ifdef notdef
 331 /*
 332  * After a routing change, flush old routing
 333  * and allocate a (hopefully) better one.
 334  */
 335 void
 336 ipx_rtchange(struct ipxpcb *ipxp)
 337 {
 338         if (ipxp->ipxp_route.ro_rt != NULL) {
 339                 rtfree(ipxp->ipxp_route.ro_rt);
 340                 ipxp->ipxp_route.ro_rt = NULL;
 341                 /*
 342                  * A new route can be allocated the next time
 343                  * output is attempted.
 344                  */
 345         }
 346         /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
 347 }
 348 #endif
 349
 350 struct ipxpcb *
 351 ipx_pcblookup(struct ipx_addr *faddr, int lport, int wildp)
 352 {
 353         struct ipxpcb *ipxp, *match = 0;
 354         int matchwild = 3, wildcard;
 355         u_short fport;
 356
 357         fport = faddr->x_port;
 358         for (ipxp = (&ipxpcb)->ipxp_next; ipxp != (&ipxpcb); ipxp = ipxp->ipxp_next) {
 359                 if (ipxp->ipxp_lport != lport)
 360                         continue;
 361                 wildcard = 0;
 362                 if (ipx_nullhost(ipxp->ipxp_faddr)) {
 363                         if (!ipx_nullhost(*faddr))
 364                                 wildcard++;
 365                 } else {
 366                         if (ipx_nullhost(*faddr))
 367                                 wildcard++;
 368                         else {
 369                                 if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr))
 370                                         continue;
 371                                 if (ipxp->ipxp_fport != fport) {
 372                                         if (ipxp->ipxp_fport != 0)
 373                                                 continue;
 374                                         else
 375                                                 wildcard++;
 376                                 }
 377                         }
 378                 }
 379                 if (wildcard && wildp == 0)
 380                         continue;
 381                 if (wildcard < matchwild) {
 382                         match = ipxp;
 383                         matchwild = wildcard;
 384                         if (wildcard == 0)
 385                                 break;
 386                 }
 387         }
 388         return (match);
 389 }