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a0afe699ba
a new rwlock, ipx_ifaddr_rw, wrapped with macros. This locking is necessary but not sufficient, in isolation, to satisfy the stability requirements of a fully parallel IPX input path during interface reconfiguration. MFC after: 3 weeks
285 lines
8.2 KiB
C
285 lines
8.2 KiB
C
/*-
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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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* 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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* Copyright (c) 1995, Mike Mitchell
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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_outputfl.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/mbuf.h>
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#include <sys/socket.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_var.h>
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int
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ipx_outputfl(struct mbuf *m0, struct route *ro, int flags)
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{
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struct ipx *ipx = mtod(m0, struct ipx *);
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struct ifnet *ifp = NULL;
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int error = 0;
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struct sockaddr_ipx *dst;
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struct route ipxroute;
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/*
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* Route packet.
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*/
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if (ro == NULL) {
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ro = &ipxroute;
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bzero((caddr_t)ro, sizeof(*ro));
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}
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dst = (struct sockaddr_ipx *)&ro->ro_dst;
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if (ro->ro_rt == NULL) {
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dst->sipx_family = AF_IPX;
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dst->sipx_len = sizeof(*dst);
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dst->sipx_addr = ipx->ipx_dna;
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dst->sipx_addr.x_port = 0;
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/*
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* If routing to interface only,
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* short circuit routing lookup.
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*/
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if (flags & IPX_ROUTETOIF) {
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struct ipx_ifaddr *ia;
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IPX_IFADDR_RLOCK();
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ia = ipx_iaonnetof(&ipx->ipx_dna);
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if (ia == NULL) {
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IPX_IFADDR_RUNLOCK();
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ipxstat.ipxs_noroute++;
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error = ENETUNREACH;
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goto bad;
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}
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ifp = ia->ia_ifp;
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IPX_IFADDR_RUNLOCK();
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goto gotif;
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}
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rtalloc_ign(ro, 0);
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} else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
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/*
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* The old route has gone away; try for a new one.
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*/
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RTFREE(ro->ro_rt);
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ro->ro_rt = NULL;
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rtalloc_ign(ro, 0);
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}
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if (ro->ro_rt == NULL || (ifp = ro->ro_rt->rt_ifp) == NULL) {
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ipxstat.ipxs_noroute++;
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error = ENETUNREACH;
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goto bad;
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}
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ro->ro_rt->rt_use++;
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if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
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dst = (struct sockaddr_ipx *)ro->ro_rt->rt_gateway;
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gotif:
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/*
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* Look for multicast addresses and
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* and verify user is allowed to send
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* such a packet.
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*/
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if (dst->sipx_addr.x_host.c_host[0]&1) {
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if ((ifp->if_flags & (IFF_BROADCAST | IFF_LOOPBACK)) == 0) {
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error = EADDRNOTAVAIL;
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goto bad;
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}
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if ((flags & IPX_ALLOWBROADCAST) == 0) {
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error = EACCES;
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goto bad;
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}
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m0->m_flags |= M_BCAST;
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}
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if (htons(ipx->ipx_len) <= ifp->if_mtu) {
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ipxstat.ipxs_localout++;
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error = (*ifp->if_output)(ifp, m0,
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(struct sockaddr *)dst, ro);
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goto done;
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} else {
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ipxstat.ipxs_mtutoosmall++;
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error = EMSGSIZE;
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}
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bad:
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m_freem(m0);
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done:
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if (ro == &ipxroute && (flags & IPX_ROUTETOIF) == 0 &&
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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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return (error);
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}
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/*
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* This will broadcast the type 20 (Netbios) packet to all the interfaces
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* that have ipx configured and isn't in the list yet.
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*/
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int
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ipx_output_type20(struct mbuf *m)
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{
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struct ipx *ipx;
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union ipx_net *nbnet;
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struct ipx_ifaddr *ia, *tia = NULL;
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int error = 0;
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struct mbuf *m1;
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int i;
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struct ifnet *ifp;
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struct sockaddr_ipx dst;
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/*
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* We have to get to the 32 bytes after the ipx header also, so
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* that we can fill in the network address of the receiving
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* interface.
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*/
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if ((m->m_flags & M_EXT || m->m_len < (sizeof(struct ipx) + 32)) &&
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(m = m_pullup(m, sizeof(struct ipx) + 32)) == NULL) {
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ipxstat.ipxs_toosmall++;
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return (0);
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}
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ipx = mtod(m, struct ipx *);
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nbnet = (union ipx_net *)(ipx + 1);
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if (ipx->ipx_tc >= 8)
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goto bad;
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/*
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* Now see if we have already seen this.
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*/
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IPX_IFADDR_RLOCK();
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for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
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if(ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) {
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if(tia == NULL)
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tia = ia;
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for (i=0;i<ipx->ipx_tc;i++,nbnet++)
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if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
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*nbnet)) {
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IPX_IFADDR_RUNLOCK();
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goto bad;
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}
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}
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/*
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* Don't route the packet if the interface where it come from
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* does not have an IPX address.
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*/
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if (tia == NULL) {
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IPX_IFADDR_RUNLOCK();
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goto bad;
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}
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/*
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* Add our receiving interface to the list.
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*/
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nbnet = (union ipx_net *)(ipx + 1);
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nbnet += ipx->ipx_tc;
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*nbnet = tia->ia_addr.sipx_addr.x_net;
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/*
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* Increment the hop count.
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*/
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ipx->ipx_tc++;
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ipxstat.ipxs_forward++;
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/*
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* Send to all directly connected ifaces not in list and
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* not to the one it came from.
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*/
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m->m_flags &= ~M_BCAST;
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bzero(&dst, sizeof(dst));
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dst.sipx_family = AF_IPX;
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dst.sipx_len = 12;
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dst.sipx_addr.x_host = ipx_broadhost;
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for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
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if(ia->ia_ifa.ifa_ifp != m->m_pkthdr.rcvif) {
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nbnet = (union ipx_net *)(ipx + 1);
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for (i=0;i<ipx->ipx_tc;i++,nbnet++)
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if(ipx_neteqnn(ia->ia_addr.sipx_addr.x_net,
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*nbnet))
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goto skip_this;
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/*
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* Insert the net address of the dest net and
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* calculate the new checksum if needed.
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*/
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ifp = ia->ia_ifa.ifa_ifp;
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dst.sipx_addr.x_net = ia->ia_addr.sipx_addr.x_net;
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ipx->ipx_dna.x_net = dst.sipx_addr.x_net;
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if(ipx->ipx_sum != 0xffff)
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ipx->ipx_sum = ipx_cksum(m, ntohs(ipx->ipx_len));
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m1 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
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if(m1) {
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error = (*ifp->if_output)(ifp, m1,
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(struct sockaddr *)&dst, NULL);
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/* XXX ipxstat.ipxs_localout++; */
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}
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skip_this: ;
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}
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IPX_IFADDR_RUNLOCK();
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bad:
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m_freem(m);
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return (error);
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}
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