0fb4154318
from HEAD to RELENG_6: Rework IPX/SPX socket and pcb reference model: - Introduce invariant that all IPX/SPX sockets will have valid so_pcb pointers to ipxpcb structures, and that for SPX, the control block pointer will always be valid. Don't attempt to free the socket or pcb at various odd points, such as disconnect. - Add a new ipxpcb flag, IPXP_DROPPED, which will be set in place of freeing PCB's so that this invariant can be maintained. This flag is now checked instead of a NULL check in various socket protocol calls. - Introduce many assertions that this invariant holds. - Various pieces of code, such as the SPX timer code, no longer needs to jump through hoops in case it frees a PCB while running. - Break out ipx_pcbfree() from ipx_pcbdetach(). Likewise spx_pcbdetach(). - Comment on some SMP-related limitations to the SPX code. - Update copyrights.
388 lines
10 KiB
C
388 lines
10 KiB
C
/*-
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* Copyright (c) 1984, 1985, 1986, 1987, 1993
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* The Regents of the University of California.
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* Copyright (c) 1995, Mike Mitchell
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* Copyright (c) 2004-2006 Robert N. M. Watson
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* 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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KASSERT(so->so_pcb == NULL, ("ipx_pcballoc: so_pcb != NULL"));
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IPX_LIST_LOCK_ASSERT();
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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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IPX_LOCK_INIT(ipxp);
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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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IPX_LIST_LOCK_ASSERT();
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IPX_LOCK_ASSERT(ipxp);
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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) == NULL)
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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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IPX_LIST_LOCK_ASSERT();
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IPX_LOCK_ASSERT(ipxp);
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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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IPX_LIST_LOCK_ASSERT();
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IPX_LOCK_ASSERT(ipxp);
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ipxp->ipxp_faddr = zeroipx_addr;
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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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IPX_LIST_LOCK_ASSERT();
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IPX_LOCK_ASSERT(ipxp);
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so->so_pcb = NULL;
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ipxp->ipxp_socket = NULL;
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}
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void
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ipx_pcbfree(ipxp)
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struct ipxpcb *ipxp;
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{
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KASSERT(ipxp->ipxp_socket == NULL,
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("ipx_pcbfree: ipxp_socket != NULL"));
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IPX_LIST_LOCK_ASSERT();
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IPX_LOCK_ASSERT(ipxp);
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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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IPX_LOCK_DESTROY(ipxp);
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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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IPX_LOCK(ipxp);
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sipx->sipx_addr = ipxp->ipxp_laddr;
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IPX_UNLOCK(ipxp);
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*nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
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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(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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IPX_LOCK(ipxp);
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sipx->sipx_addr = ipxp->ipxp_faddr;
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IPX_UNLOCK(ipxp);
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*nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
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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 = NULL;
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int matchwild = 3, wildcard;
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u_short fport;
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IPX_LIST_LOCK_ASSERT();
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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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