6c56a18747
expects a locked route reference. This removes a panic that occurs when connected ipxpcb is closed and its route free'd, and may have been present since the route locking took place. MFC after: 2 weeks
356 lines
9.7 KiB
C
356 lines
9.7 KiB
C
/*
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* Copyright (c) 2004 Robert N. M. Watson
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* Copyright (c) 1995, Mike Mitchell
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* Copyright (c) 1984, 1985, 1986, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ipx_pcb.c
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#include <netipx/ipx_pcb.h>
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#include <netipx/ipx_var.h>
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static struct ipx_addr zeroipx_addr;
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static u_short ipxpcb_lport_cache;
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int
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ipx_pcballoc(so, head, td)
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struct socket *so;
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struct ipxpcbhead *head;
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struct thread *td;
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{
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register struct ipxpcb *ipxp;
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MALLOC(ipxp, struct ipxpcb *, sizeof *ipxp, M_PCB, M_NOWAIT | M_ZERO);
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if (ipxp == NULL)
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return (ENOBUFS);
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ipxp->ipxp_socket = so;
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if (ipxcksum)
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ipxp->ipxp_flags |= IPXP_CHECKSUM;
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LIST_INSERT_HEAD(head, ipxp, ipxp_list);
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so->so_pcb = (caddr_t)ipxp;
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return (0);
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}
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int
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ipx_pcbbind(ipxp, nam, td)
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register struct ipxpcb *ipxp;
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struct sockaddr *nam;
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struct thread *td;
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{
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register struct sockaddr_ipx *sipx;
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u_short lport = 0;
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if (ipxp->ipxp_lport || !ipx_nullhost(ipxp->ipxp_laddr))
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return (EINVAL);
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if (nam == NULL)
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goto noname;
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sipx = (struct sockaddr_ipx *)nam;
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if (!ipx_nullhost(sipx->sipx_addr)) {
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int tport = sipx->sipx_port;
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sipx->sipx_port = 0; /* yech... */
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if (ifa_ifwithaddr((struct sockaddr *)sipx) == 0)
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return (EADDRNOTAVAIL);
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sipx->sipx_port = tport;
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}
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lport = sipx->sipx_port;
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if (lport) {
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u_short aport = ntohs(lport);
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int error;
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if (aport < IPXPORT_RESERVED &&
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td != NULL && (error = suser(td)) != 0)
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return (error);
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if (ipx_pcblookup(&zeroipx_addr, lport, 0))
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return (EADDRINUSE);
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}
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ipxp->ipxp_laddr = sipx->sipx_addr;
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noname:
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if (lport == 0)
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do {
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ipxpcb_lport_cache++;
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if ((ipxpcb_lport_cache < IPXPORT_RESERVED) ||
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(ipxpcb_lport_cache >= IPXPORT_WELLKNOWN))
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ipxpcb_lport_cache = IPXPORT_RESERVED;
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lport = htons(ipxpcb_lport_cache);
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} while (ipx_pcblookup(&zeroipx_addr, lport, 0));
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ipxp->ipxp_lport = lport;
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return (0);
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}
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/*
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* Connect from a socket to a specified address.
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* Both address and port must be specified in argument sipx.
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* If don't have a local address for this socket yet,
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* then pick one.
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*/
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int
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ipx_pcbconnect(ipxp, nam, td)
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struct ipxpcb *ipxp;
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struct sockaddr *nam;
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struct thread *td;
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{
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struct ipx_ifaddr *ia;
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register struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)nam;
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register struct ipx_addr *dst;
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register struct route *ro;
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struct ifnet *ifp;
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ia = NULL;
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if (sipx->sipx_family != AF_IPX)
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return (EAFNOSUPPORT);
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if (sipx->sipx_port == 0 || ipx_nullhost(sipx->sipx_addr))
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return (EADDRNOTAVAIL);
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/*
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* If we haven't bound which network number to use as ours,
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* we will use the number of the outgoing interface.
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* This depends on having done a routing lookup, which
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* we will probably have to do anyway, so we might
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* as well do it now. On the other hand if we are
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* sending to multiple destinations we may have already
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* done the lookup, so see if we can use the route
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* from before. In any case, we only
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* chose a port number once, even if sending to multiple
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* destinations.
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*/
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ro = &ipxp->ipxp_route;
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dst = &satoipx_addr(ro->ro_dst);
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if (ipxp->ipxp_socket->so_options & SO_DONTROUTE)
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goto flush;
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if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr))
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goto flush;
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if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) {
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if (ro->ro_rt != NULL && !(ro->ro_rt->rt_flags & RTF_HOST)) {
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/* can patch route to avoid rtalloc */
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*dst = sipx->sipx_addr;
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} else {
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flush:
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if (ro->ro_rt != NULL)
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RTFREE(ro->ro_rt);
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ro->ro_rt = NULL;
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}
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}/* else cached route is ok; do nothing */
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ipxp->ipxp_lastdst = sipx->sipx_addr;
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if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
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(ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) {
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/* No route yet, so try to acquire one */
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ro->ro_dst.sa_family = AF_IPX;
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ro->ro_dst.sa_len = sizeof(ro->ro_dst);
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*dst = sipx->sipx_addr;
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dst->x_port = 0;
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rtalloc_ign(ro, 0);
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}
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if (ipx_neteqnn(ipxp->ipxp_laddr.x_net, ipx_zeronet)) {
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/*
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* If route is known or can be allocated now,
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* our src addr is taken from the i/f, else punt.
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*/
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/*
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* If we found a route, use the address
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* corresponding to the outgoing interface
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*/
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if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
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for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
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if (ia->ia_ifp == ifp)
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break;
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if (ia == NULL) {
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u_short fport = sipx->sipx_addr.x_port;
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sipx->sipx_addr.x_port = 0;
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ia = (struct ipx_ifaddr *)
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ifa_ifwithdstaddr((struct sockaddr *)sipx);
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sipx->sipx_addr.x_port = fport;
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if (ia == NULL)
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ia = ipx_iaonnetof(&sipx->sipx_addr);
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if (ia == NULL)
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ia = ipx_ifaddr;
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if (ia == NULL)
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return (EADDRNOTAVAIL);
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}
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ipxp->ipxp_laddr.x_net = satoipx_addr(ia->ia_addr).x_net;
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}
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if (ipx_nullhost(ipxp->ipxp_laddr)) {
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/*
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* If route is known or can be allocated now,
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* our src addr is taken from the i/f, else punt.
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*/
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/*
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* If we found a route, use the address
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* corresponding to the outgoing interface
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*/
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if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
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for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
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if (ia->ia_ifp == ifp)
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break;
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if (ia == NULL) {
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u_short fport = sipx->sipx_addr.x_port;
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sipx->sipx_addr.x_port = 0;
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ia = (struct ipx_ifaddr *)
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ifa_ifwithdstaddr((struct sockaddr *)sipx);
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sipx->sipx_addr.x_port = fport;
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if (ia == NULL)
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ia = ipx_iaonnetof(&sipx->sipx_addr);
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if (ia == NULL)
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ia = ipx_ifaddr;
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if (ia == NULL)
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return (EADDRNOTAVAIL);
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}
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ipxp->ipxp_laddr.x_host = satoipx_addr(ia->ia_addr).x_host;
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}
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if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0))
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return (EADDRINUSE);
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if (ipxp->ipxp_lport == 0)
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ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
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/* XXX just leave it zero if we can't find a route */
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ipxp->ipxp_faddr = sipx->sipx_addr;
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/* Includes ipxp->ipxp_fport = sipx->sipx_port; */
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return (0);
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}
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void
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ipx_pcbdisconnect(ipxp)
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struct ipxpcb *ipxp;
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{
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ipxp->ipxp_faddr = zeroipx_addr;
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if (ipxp->ipxp_socket->so_state & SS_NOFDREF)
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ipx_pcbdetach(ipxp);
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}
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void
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ipx_pcbdetach(ipxp)
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struct ipxpcb *ipxp;
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{
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struct socket *so = ipxp->ipxp_socket;
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ACCEPT_LOCK();
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SOCK_LOCK(so);
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so->so_pcb = 0;
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sotryfree(so);
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if (ipxp->ipxp_route.ro_rt != NULL)
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RTFREE(ipxp->ipxp_route.ro_rt);
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LIST_REMOVE(ipxp, ipxp_list);
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FREE(ipxp, M_PCB);
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}
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void
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ipx_setsockaddr(ipxp, nam)
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register struct ipxpcb *ipxp;
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struct sockaddr **nam;
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{
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struct sockaddr_ipx *sipx, ssipx;
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sipx = &ssipx;
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bzero((caddr_t)sipx, sizeof(*sipx));
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sipx->sipx_len = sizeof(*sipx);
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sipx->sipx_family = AF_IPX;
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sipx->sipx_addr = ipxp->ipxp_laddr;
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*nam = sodupsockaddr((struct sockaddr *)sipx, M_NOWAIT);
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}
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void
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ipx_setpeeraddr(ipxp, nam)
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register struct ipxpcb *ipxp;
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struct sockaddr **nam;
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{
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struct sockaddr_ipx *sipx, ssipx;
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sipx = &ssipx;
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bzero((caddr_t)sipx, sizeof(*sipx));
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sipx->sipx_len = sizeof(*sipx);
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sipx->sipx_family = AF_IPX;
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sipx->sipx_addr = ipxp->ipxp_faddr;
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*nam = sodupsockaddr((struct sockaddr *)sipx, M_NOWAIT);
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}
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struct ipxpcb *
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ipx_pcblookup(faddr, lport, wildp)
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struct ipx_addr *faddr;
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u_short lport;
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int wildp;
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{
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register struct ipxpcb *ipxp, *match = 0;
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int matchwild = 3, wildcard;
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u_short fport;
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fport = faddr->x_port;
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LIST_FOREACH(ipxp, &ipxpcb_list, ipxp_list) {
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if (ipxp->ipxp_lport != lport)
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continue;
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wildcard = 0;
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if (ipx_nullhost(ipxp->ipxp_faddr)) {
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if (!ipx_nullhost(*faddr))
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wildcard++;
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} else {
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if (ipx_nullhost(*faddr))
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wildcard++;
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else {
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if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr))
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continue;
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if (ipxp->ipxp_fport != fport) {
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if (ipxp->ipxp_fport != 0)
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continue;
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else
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wildcard++;
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}
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}
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}
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if (wildcard && wildp == 0)
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continue;
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if (wildcard < matchwild) {
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match = ipxp;
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matchwild = wildcard;
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if (wildcard == 0)
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break;
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}
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}
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return (match);
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}
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