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/priv.h>
  45 #include <sys/socket.h>
  46 #include <sys/socketvar.h>
  47 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50 #include <net/route.h>
  51
  52 #include "ipx.h"
  53 #include "ipx_if.h"
  54 #include "ipx_pcb.h"
  55 #include "ipx_var.h"
  56
  57 static struct   ipx_addr zeroipx_addr;
  58
  59 int
  60 ipx_pcballoc(struct socket *so, struct ipxpcb *head)
  61 {
  62         struct ipxpcb *ipxp;
  63
  64         MALLOC(ipxp, struct ipxpcb *, sizeof *ipxp, M_PCB,
  65                 M_WAITOK | M_ZERO | M_NULLOK);
  66         if (ipxp == NULL)
  67                 return (ENOBUFS);
  68         ipxp->ipxp_socket = so;
  69         if (ipxcksum)
  70                 ipxp->ipxp_flags |= IPXP_CHECKSUM;
  71         insque(ipxp, head);
  72         so->so_pcb = (caddr_t)ipxp;
  73         return (0);
  74 }
  75
  76 int
  77 ipx_pcbbind(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
  78 {
  79         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 = (struct sockaddr_ipx *)nam;
  87         if (!ipx_nullhost(sipx->sipx_addr)) {
  88                 int tport = sipx->sipx_port;
  89
  90                 sipx->sipx_port = 0;            /* yech... */
  91                 if (ifa_ifwithaddr((struct sockaddr *)sipx) == 0)
  92                         return (EADDRNOTAVAIL);
  93                 sipx->sipx_port = tport;
  94         }
  95         lport = sipx->sipx_port;
  96         if (lport) {
  97                 u_short aport = ntohs(lport);
  98                 int error;
  99
 100                 if (aport < IPXPORT_RESERVED &&
 101                     td != NULL && (error = priv_check(td, PRIV_ROOT)) != 0)
 102                         return (error);
 103                 if (ipx_pcblookup(&zeroipx_addr, lport, 0))
 104                         return (EADDRINUSE);
 105         }
 106         ipxp->ipxp_laddr = sipx->sipx_addr;
 107 noname:
 108         if (lport == 0)
 109                 do {
 110                         ipxpcb.ipxp_lport++;
 111                         if ((ipxpcb.ipxp_lport < IPXPORT_RESERVED) ||
 112                             (ipxpcb.ipxp_lport >= IPXPORT_WELLKNOWN))
 113                                 ipxpcb.ipxp_lport = IPXPORT_RESERVED;
 114                         lport = htons(ipxpcb.ipxp_lport);
 115                 } while (ipx_pcblookup(&zeroipx_addr, lport, 0));
 116         ipxp->ipxp_lport = lport;
 117         return (0);
 118 }
 119
 120 /*
 121  * Connect from a socket to a specified address.
 122  * Both address and port must be specified in argument sipx.
 123  * If don't have a local address for this socket yet,
 124  * then pick one.
 125  */
 126 int
 127 ipx_pcbconnect(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
 128 {
 129         struct ipx_ifaddr *ia;
 130         struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)nam;
 131         struct ipx_addr *dst;
 132         struct route *ro;
 133         struct ifnet *ifp;
 134
 135         ia = NULL;
 136
 137         if (sipx->sipx_family != AF_IPX)
 138                 return (EAFNOSUPPORT);
 139         if (sipx->sipx_port == 0 || ipx_nullhost(sipx->sipx_addr))
 140                 return (EADDRNOTAVAIL);
 141         /*
 142          * If we haven't bound which network number to use as ours,
 143          * we will use the number of the outgoing interface.
 144          * This depends on having done a routing lookup, which
 145          * we will probably have to do anyway, so we might
 146          * as well do it now.  On the other hand if we are
 147          * sending to multiple destinations we may have already
 148          * done the lookup, so see if we can use the route
 149          * from before.  In any case, we only
 150          * chose a port number once, even if sending to multiple
 151          * destinations.
 152          */
 153         ro = &ipxp->ipxp_route;
 154         dst = &satoipx_addr(ro->ro_dst);
 155         if (ipxp->ipxp_socket->so_options & SO_DONTROUTE)
 156                 goto flush;
 157         if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr))
 158                 goto flush;
 159         if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) {
 160                 if (ro->ro_rt != NULL && !(ro->ro_rt->rt_flags & RTF_HOST)) {
 161                         /* can patch route to avoid rtalloc */
 162                         *dst = sipx->sipx_addr;
 163                 } else {
 164         flush:
 165                         if (ro->ro_rt != NULL)
 166                                 RTFREE(ro->ro_rt);
 167                         ro->ro_rt = NULL;
 168                 }
 169         }/* else cached route is ok; do nothing */
 170         ipxp->ipxp_lastdst = sipx->sipx_addr;
 171         if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
 172             (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) {
 173                     /* No route yet, so try to acquire one */
 174                     ro->ro_dst.sa_family = AF_IPX;
 175                     ro->ro_dst.sa_len = sizeof(ro->ro_dst);
 176                     *dst = sipx->sipx_addr;
 177                     dst->x_port = 0;
 178                     rtalloc(ro);
 179         }
 180         if (ipx_neteqnn(ipxp->ipxp_laddr.x_net, ipx_zeronet)) {
 181                 /*
 182                  * If route is known or can be allocated now,
 183                  * our src addr is taken from the i/f, else punt.
 184                  */
 185
 186                 /*
 187                  * If we found a route, use the address
 188                  * corresponding to the outgoing interface
 189                  */
 190                 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
 191                         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 192                                 if (ia->ia_ifp == ifp)
 193                                         break;
 194                 if (ia == NULL) {
 195                         u_short fport = sipx->sipx_addr.x_port;
 196                         sipx->sipx_addr.x_port = 0;
 197                         ia = (struct ipx_ifaddr *)
 198                                 ifa_ifwithdstaddr((struct sockaddr *)sipx);
 199                         sipx->sipx_addr.x_port = fport;
 200                         if (ia == NULL)
 201                                 ia = ipx_iaonnetof(&sipx->sipx_addr);
 202                         if (ia == NULL)
 203                                 ia = ipx_ifaddr;
 204                         if (ia == NULL)
 205                                 return (EADDRNOTAVAIL);
 206                 }
 207                 ipxp->ipxp_laddr.x_net = satoipx_addr(ia->ia_addr).x_net;
 208         }
 209         if (ipx_nullhost(ipxp->ipxp_laddr)) {
 210                 /*
 211                  * If route is known or can be allocated now,
 212                  * our src addr is taken from the i/f, else punt.
 213                  */
 214
 215                 /*
 216                  * If we found a route, use the address
 217                  * corresponding to the outgoing interface
 218                  */
 219                 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
 220                         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
 221                                 if (ia->ia_ifp == ifp)
 222                                         break;
 223                 if (ia == NULL) {
 224                         u_short fport = sipx->sipx_addr.x_port;
 225                         sipx->sipx_addr.x_port = 0;
 226                         ia = (struct ipx_ifaddr *)
 227                                 ifa_ifwithdstaddr((struct sockaddr *)sipx);
 228                         sipx->sipx_addr.x_port = fport;
 229                         if (ia == NULL)
 230                                 ia = ipx_iaonnetof(&sipx->sipx_addr);
 231                         if (ia == NULL)
 232                                 ia = ipx_ifaddr;
 233                         if (ia == NULL)
 234                                 return (EADDRNOTAVAIL);
 235                 }
 236                 ipxp->ipxp_laddr.x_host = satoipx_addr(ia->ia_addr).x_host;
 237         }
 238         if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0))
 239                 return (EADDRINUSE);
 240         if (ipxp->ipxp_lport == 0)
 241                 ipx_pcbbind(ipxp, NULL, td);
 242
 243         /* XXX just leave it zero if we can't find a route */
 244
 245         ipxp->ipxp_faddr = sipx->sipx_addr;
 246         /* Includes ipxp->ipxp_fport = sipx->sipx_port; */
 247         return (0);
 248 }
 249
 250 void
 251 ipx_pcbdisconnect(struct ipxpcb *ipxp)
 252 {
 253
 254         ipxp->ipxp_faddr = zeroipx_addr;
 255         if (ipxp->ipxp_socket->so_state & SS_NOFDREF)
 256                 ipx_pcbdetach(ipxp);
 257 }
 258
 259 void
 260 ipx_pcbdetach(struct ipxpcb *ipxp)
 261 {
 262         struct socket *so = ipxp->ipxp_socket;
 263
 264         so->so_pcb = 0;
 265         sofree(so);
 266         if (ipxp->ipxp_route.ro_rt != NULL)
 267                 rtfree(ipxp->ipxp_route.ro_rt);
 268         remque(ipxp);
 269         FREE(ipxp, M_PCB);
 270 }
 271
 272 void
 273 ipx_setsockaddr(struct ipxpcb *ipxp, struct sockaddr **nam)
 274 {
 275         struct sockaddr_ipx *sipx, ssipx;
 276
 277         sipx = &ssipx;
 278         bzero((caddr_t)sipx, sizeof(*sipx));
 279         sipx->sipx_len = sizeof(*sipx);
 280         sipx->sipx_family = AF_IPX;
 281         sipx->sipx_addr = ipxp->ipxp_laddr;
 282         *nam = dup_sockaddr((struct sockaddr *)sipx);
 283 }
 284
 285 void
 286 ipx_setpeeraddr(struct ipxpcb *ipxp, struct sockaddr **nam)
 287 {
 288         struct sockaddr_ipx *sipx, ssipx;
 289
 290         sipx = &ssipx;
 291         bzero((caddr_t)sipx, sizeof(*sipx));
 292         sipx->sipx_len = sizeof(*sipx);
 293         sipx->sipx_family = AF_IPX;
 294         sipx->sipx_addr = ipxp->ipxp_faddr;
 295         *nam = dup_sockaddr((struct sockaddr *)sipx);
 296 }
 297
 298 /*
 299  * Pass some notification to all connections of a protocol
 300  * associated with address dst.  Call the
 301  * protocol specific routine to handle each connection.
 302  * Also pass an extra paramter via the ipxpcb. (which may in fact
 303  * be a parameter list!)
 304  */
 305 void
 306 ipx_pcbnotify(struct ipx_addr *dst, int error,
 307               void (*notify)(struct ipxpcb *), long param)
 308 {
 309         struct ipxpcb *ipxp, *oinp;
 310
 311         crit_enter();
 312
 313         for (ipxp = (&ipxpcb)->ipxp_next; ipxp != (&ipxpcb);) {
 314                 if (!ipx_hosteq(*dst,ipxp->ipxp_faddr)) {
 315         next:
 316                         ipxp = ipxp->ipxp_next;
 317                         continue;
 318                 }
 319                 if (ipxp->ipxp_socket == 0)
 320                         goto next;
 321                 if (error)
 322                         ipxp->ipxp_socket->so_error = error;
 323                 oinp = ipxp;
 324                 ipxp = ipxp->ipxp_next;
 325                 oinp->ipxp_notify_param = param;
 326                 (*notify)(oinp);
 327         }
 328         crit_exit();
 329 }
 330
 331 #ifdef notdef
 332 /*
 333  * After a routing change, flush old routing
 334  * and allocate a (hopefully) better one.
 335  */
 336 void
 337 ipx_rtchange(struct ipxpcb *ipxp)
 338 {
 339         if (ipxp->ipxp_route.ro_rt != NULL) {
 340                 rtfree(ipxp->ipxp_route.ro_rt);
 341                 ipxp->ipxp_route.ro_rt = NULL;
 342                 /*
 343                  * A new route can be allocated the next time
 344                  * output is attempted.
 345                  */
 346         }
 347         /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
 348 }
 349 #endif
 350
 351 struct ipxpcb *
 352 ipx_pcblookup(struct ipx_addr *faddr, int lport, int wildp)
 353 {
 354         struct ipxpcb *ipxp, *match = 0;
 355         int matchwild = 3, wildcard;
 356         u_short fport;
 357
 358         fport = faddr->x_port;
 359         for (ipxp = (&ipxpcb)->ipxp_next; ipxp != (&ipxpcb); ipxp = ipxp->ipxp_next) {
 360                 if (ipxp->ipxp_lport != lport)
 361                         continue;
 362                 wildcard = 0;
 363                 if (ipx_nullhost(ipxp->ipxp_faddr)) {
 364                         if (!ipx_nullhost(*faddr))
 365                                 wildcard++;
 366                 } else {
 367                         if (ipx_nullhost(*faddr))
 368                                 wildcard++;
 369                         else {
 370                                 if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr))
 371                                         continue;
 372                                 if (ipxp->ipxp_fport != fport) {
 373                                         if (ipxp->ipxp_fport != 0)
 374                                                 continue;
 375                                         else
 376                                                 wildcard++;
 377                                 }
 378                         }
 379                 }
 380                 if (wildcard && wildp == 0)
 381                         continue;
 382                 if (wildcard < matchwild) {
 383                         match = ipxp;
 384                         matchwild = wildcard;
 385                         if (wildcard == 0)
 386                                 break;
 387                 }
 388         }
 389         return (match);
 390 }