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unneback |
/*
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* Copyright (c) 1982, 1986, 1988, 1990, 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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* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
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* $Id: ip_output.c,v 1.2 2001-09-27 12:01:56 chris Exp $
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*/
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#define _IP_VHL
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/protosw.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 <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#ifdef vax
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#include <machine/mtpr.h>
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#endif
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#include <machine/in_cksum.h>
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#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1
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#undef COMPAT_IPFW
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#define COMPAT_IPFW 1
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#else
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#undef COMPAT_IPFW
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#endif
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u_short ip_id;
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static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, int *));
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static void ip_mloopback
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__P((struct ifnet *, struct mbuf *, struct sockaddr_in *, int));
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static int ip_getmoptions
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__P((int, struct ip_moptions *, struct mbuf **));
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static int ip_optcopy __P((struct ip *, struct ip *));
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static int ip_pcbopts __P((struct mbuf **, struct mbuf *));
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static int ip_setmoptions
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__P((int, struct ip_moptions **, struct mbuf *));
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| 83 |
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extern struct protosw inetsw[];
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/*
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* IP output. The packet in mbuf chain m contains a skeletal IP
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* header (with len, off, ttl, proto, tos, src, dst).
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* The mbuf chain containing the packet will be freed.
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* The mbuf opt, if present, will not be freed.
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*/
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int
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ip_output(m0, opt, ro, flags, imo)
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struct mbuf *m0;
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struct mbuf *opt;
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struct route *ro;
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int flags;
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struct ip_moptions *imo;
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{
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struct ip *ip, *mhip;
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struct ifnet *ifp;
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struct mbuf *m = m0;
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int hlen = sizeof (struct ip);
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int len, off, error = 0;
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struct sockaddr_in *dst;
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struct in_ifaddr *ia;
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int isbroadcast;
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#ifdef DIAGNOSTIC
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("ip_output no HDR");
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if (!ro)
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panic("ip_output no route, proto = %d",
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mtod(m, struct ip *)->ip_p);
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#endif
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if (opt) {
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m = ip_insertoptions(m, opt, &len);
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hlen = len;
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}
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ip = mtod(m, struct ip *);
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/*
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* Fill in IP header.
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*/
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if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
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ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
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ip->ip_off &= IP_DF;
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ip->ip_id = htons(ip_id++);
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ipstat.ips_localout++;
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} else {
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hlen = IP_VHL_HL(ip->ip_vhl) << 2;
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}
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dst = (struct sockaddr_in *)&ro->ro_dst;
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/*
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* If there is a cached route,
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* check that it is to the same destination
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* and is still up. If not, free it and try again.
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*/
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if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
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dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
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RTFREE(ro->ro_rt);
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ro->ro_rt = (struct rtentry *)0;
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}
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if (ro->ro_rt == 0) {
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dst->sin_family = AF_INET;
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dst->sin_len = sizeof(*dst);
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dst->sin_addr = ip->ip_dst;
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}
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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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#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
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#define sintosa(sin) ((struct sockaddr *)(sin))
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if (flags & IP_ROUTETOIF) {
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if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
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(ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
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ipstat.ips_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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ip->ip_ttl = 1;
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isbroadcast = in_broadcast(dst->sin_addr, ifp);
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} else {
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/*
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* If this is the case, we probably don't want to allocate
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* a protocol-cloned route since we didn't get one from the
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* ULP. This lets TCP do its thing, while not burdening
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* forwarding or ICMP with the overhead of cloning a route.
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* Of course, we still want to do any cloning requested by
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* the link layer, as this is probably required in all cases
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* for correct operation (as it is for ARP).
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*/
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if (ro->ro_rt == 0)
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rtalloc_ign(ro, RTF_PRCLONING);
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if (ro->ro_rt == 0) {
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ipstat.ips_noroute++;
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error = EHOSTUNREACH;
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goto bad;
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}
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ia = ifatoia(ro->ro_rt->rt_ifa);
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ifp = ro->ro_rt->rt_ifp;
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ro->ro_rt->rt_use++;
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if (ro->ro_rt->rt_flags & RTF_GATEWAY)
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dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
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if (ro->ro_rt->rt_flags & RTF_HOST)
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isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
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else
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isbroadcast = in_broadcast(dst->sin_addr, ifp);
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| 190 |
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}
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| 191 |
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if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
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| 192 |
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struct in_multi *inm;
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| 194 |
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m->m_flags |= M_MCAST;
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| 195 |
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/*
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| 196 |
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* IP destination address is multicast. Make sure "dst"
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| 197 |
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* still points to the address in "ro". (It may have been
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| 198 |
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* changed to point to a gateway address, above.)
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| 199 |
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*/
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| 200 |
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dst = (struct sockaddr_in *)&ro->ro_dst;
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| 201 |
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/*
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| 202 |
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* See if the caller provided any multicast options
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| 203 |
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*/
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| 204 |
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if (imo != NULL) {
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| 205 |
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ip->ip_ttl = imo->imo_multicast_ttl;
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if (imo->imo_multicast_ifp != NULL)
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| 207 |
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ifp = imo->imo_multicast_ifp;
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if (imo->imo_multicast_vif != -1)
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| 209 |
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ip->ip_src.s_addr =
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| 210 |
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ip_mcast_src(imo->imo_multicast_vif);
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| 211 |
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} else
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| 212 |
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ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
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| 213 |
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/*
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| 214 |
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* Confirm that the outgoing interface supports multicast.
|
| 215 |
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*/
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| 216 |
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if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
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| 217 |
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if ((ifp->if_flags & IFF_MULTICAST) == 0) {
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| 218 |
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ipstat.ips_noroute++;
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| 219 |
|
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error = ENETUNREACH;
|
| 220 |
|
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goto bad;
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| 221 |
|
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}
|
| 222 |
|
|
}
|
| 223 |
|
|
/*
|
| 224 |
|
|
* If source address not specified yet, use address
|
| 225 |
|
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* of outgoing interface.
|
| 226 |
|
|
*/
|
| 227 |
|
|
if (ip->ip_src.s_addr == INADDR_ANY) {
|
| 228 |
|
|
register struct in_ifaddr *ia;
|
| 229 |
|
|
|
| 230 |
|
|
for (ia = in_ifaddr; ia; ia = ia->ia_next)
|
| 231 |
|
|
if (ia->ia_ifp == ifp) {
|
| 232 |
|
|
ip->ip_src = IA_SIN(ia)->sin_addr;
|
| 233 |
|
|
break;
|
| 234 |
|
|
}
|
| 235 |
|
|
}
|
| 236 |
|
|
|
| 237 |
|
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IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
|
| 238 |
|
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if (inm != NULL &&
|
| 239 |
|
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(imo == NULL || imo->imo_multicast_loop)) {
|
| 240 |
|
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/*
|
| 241 |
|
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* If we belong to the destination multicast group
|
| 242 |
|
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* on the outgoing interface, and the caller did not
|
| 243 |
|
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* forbid loopback, loop back a copy.
|
| 244 |
|
|
*/
|
| 245 |
|
|
ip_mloopback(ifp, m, dst, hlen);
|
| 246 |
|
|
}
|
| 247 |
|
|
else {
|
| 248 |
|
|
/*
|
| 249 |
|
|
* If we are acting as a multicast router, perform
|
| 250 |
|
|
* multicast forwarding as if the packet had just
|
| 251 |
|
|
* arrived on the interface to which we are about
|
| 252 |
|
|
* to send. The multicast forwarding function
|
| 253 |
|
|
* recursively calls this function, using the
|
| 254 |
|
|
* IP_FORWARDING flag to prevent infinite recursion.
|
| 255 |
|
|
*
|
| 256 |
|
|
* Multicasts that are looped back by ip_mloopback(),
|
| 257 |
|
|
* above, will be forwarded by the ip_input() routine,
|
| 258 |
|
|
* if necessary.
|
| 259 |
|
|
*/
|
| 260 |
|
|
if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
|
| 261 |
|
|
/*
|
| 262 |
|
|
* Check if rsvp daemon is running. If not, don't
|
| 263 |
|
|
* set ip_moptions. This ensures that the packet
|
| 264 |
|
|
* is multicast and not just sent down one link
|
| 265 |
|
|
* as prescribed by rsvpd.
|
| 266 |
|
|
*/
|
| 267 |
|
|
if (!rsvp_on)
|
| 268 |
|
|
imo = NULL;
|
| 269 |
|
|
if (ip_mforward(ip, ifp, m, imo) != 0) {
|
| 270 |
|
|
m_freem(m);
|
| 271 |
|
|
goto done;
|
| 272 |
|
|
}
|
| 273 |
|
|
}
|
| 274 |
|
|
}
|
| 275 |
|
|
|
| 276 |
|
|
/*
|
| 277 |
|
|
* Multicasts with a time-to-live of zero may be looped-
|
| 278 |
|
|
* back, above, but must not be transmitted on a network.
|
| 279 |
|
|
* Also, multicasts addressed to the loopback interface
|
| 280 |
|
|
* are not sent -- the above call to ip_mloopback() will
|
| 281 |
|
|
* loop back a copy if this host actually belongs to the
|
| 282 |
|
|
* destination group on the loopback interface.
|
| 283 |
|
|
*/
|
| 284 |
|
|
if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
|
| 285 |
|
|
m_freem(m);
|
| 286 |
|
|
goto done;
|
| 287 |
|
|
}
|
| 288 |
|
|
|
| 289 |
|
|
goto sendit;
|
| 290 |
|
|
}
|
| 291 |
|
|
#ifndef notdef
|
| 292 |
|
|
/*
|
| 293 |
|
|
* If source address not specified yet, use address
|
| 294 |
|
|
* of outgoing interface.
|
| 295 |
|
|
*/
|
| 296 |
|
|
if (ip->ip_src.s_addr == INADDR_ANY)
|
| 297 |
|
|
ip->ip_src = IA_SIN(ia)->sin_addr;
|
| 298 |
|
|
#endif
|
| 299 |
|
|
/*
|
| 300 |
|
|
* Verify that we have any chance at all of being able to queue
|
| 301 |
|
|
* the packet or packet fragments
|
| 302 |
|
|
*/
|
| 303 |
|
|
if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
|
| 304 |
|
|
ifp->if_snd.ifq_maxlen) {
|
| 305 |
|
|
error = ENOBUFS;
|
| 306 |
|
|
goto bad;
|
| 307 |
|
|
}
|
| 308 |
|
|
|
| 309 |
|
|
/*
|
| 310 |
|
|
* Look for broadcast address and
|
| 311 |
|
|
* and verify user is allowed to send
|
| 312 |
|
|
* such a packet.
|
| 313 |
|
|
*/
|
| 314 |
|
|
if (isbroadcast) {
|
| 315 |
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
|
| 316 |
|
|
error = EADDRNOTAVAIL;
|
| 317 |
|
|
goto bad;
|
| 318 |
|
|
}
|
| 319 |
|
|
if ((flags & IP_ALLOWBROADCAST) == 0) {
|
| 320 |
|
|
error = EACCES;
|
| 321 |
|
|
goto bad;
|
| 322 |
|
|
}
|
| 323 |
|
|
/* don't allow broadcast messages to be fragmented */
|
| 324 |
|
|
if ((u_short)ip->ip_len > ifp->if_mtu) {
|
| 325 |
|
|
error = EMSGSIZE;
|
| 326 |
|
|
goto bad;
|
| 327 |
|
|
}
|
| 328 |
|
|
m->m_flags |= M_BCAST;
|
| 329 |
|
|
} else {
|
| 330 |
|
|
m->m_flags &= ~M_BCAST;
|
| 331 |
|
|
}
|
| 332 |
|
|
|
| 333 |
|
|
sendit:
|
| 334 |
|
|
/*
|
| 335 |
|
|
* IpHack's section.
|
| 336 |
|
|
* - Xlate: translate packet's addr/port (NAT).
|
| 337 |
|
|
* - Firewall: deny/allow/etc.
|
| 338 |
|
|
* - Wrap: fake packet's addr/port <unimpl.>
|
| 339 |
|
|
* - Encapsulate: put it in another IP and send out. <unimp.>
|
| 340 |
|
|
*/
|
| 341 |
|
|
|
| 342 |
|
|
#ifdef COMPAT_IPFW
|
| 343 |
|
|
if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) {
|
| 344 |
|
|
error = EACCES;
|
| 345 |
|
|
goto done;
|
| 346 |
|
|
}
|
| 347 |
|
|
|
| 348 |
|
|
/*
|
| 349 |
|
|
* Check with the firewall...
|
| 350 |
|
|
*/
|
| 351 |
|
|
if (ip_fw_chk_ptr) {
|
| 352 |
|
|
#ifdef IPDIVERT
|
| 353 |
|
|
ip_divert_port = (*ip_fw_chk_ptr)(&ip,
|
| 354 |
|
|
hlen, ifp, ip_divert_ignore, &m);
|
| 355 |
|
|
ip_divert_ignore = 0;
|
| 356 |
|
|
if (ip_divert_port) { /* Divert packet */
|
| 357 |
|
|
(*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, 0);
|
| 358 |
|
|
goto done;
|
| 359 |
|
|
}
|
| 360 |
|
|
#else
|
| 361 |
|
|
/* If ipfw says divert, we have to just drop packet */
|
| 362 |
|
|
if ((*ip_fw_chk_ptr)(&ip, hlen, ifp, 0, &m)) {
|
| 363 |
|
|
m_freem(m);
|
| 364 |
|
|
goto done;
|
| 365 |
|
|
}
|
| 366 |
|
|
#endif
|
| 367 |
|
|
if (!m) {
|
| 368 |
|
|
error = EACCES;
|
| 369 |
|
|
goto done;
|
| 370 |
|
|
}
|
| 371 |
|
|
}
|
| 372 |
|
|
#endif /* COMPAT_IPFW */
|
| 373 |
|
|
|
| 374 |
|
|
/*
|
| 375 |
|
|
* If small enough for interface, can just send directly.
|
| 376 |
|
|
*/
|
| 377 |
|
|
if ((u_short)ip->ip_len <= ifp->if_mtu) {
|
| 378 |
|
|
ip->ip_len = htons((u_short)ip->ip_len);
|
| 379 |
|
|
ip->ip_off = htons((u_short)ip->ip_off);
|
| 380 |
|
|
ip->ip_sum = 0;
|
| 381 |
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
| 382 |
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
| 383 |
|
|
} else {
|
| 384 |
|
|
ip->ip_sum = in_cksum(m, hlen);
|
| 385 |
|
|
}
|
| 386 |
|
|
error = (*ifp->if_output)(ifp, m,
|
| 387 |
|
|
(struct sockaddr *)dst, ro->ro_rt);
|
| 388 |
|
|
goto done;
|
| 389 |
|
|
}
|
| 390 |
|
|
/*
|
| 391 |
|
|
* Too large for interface; fragment if possible.
|
| 392 |
|
|
* Must be able to put at least 8 bytes per fragment.
|
| 393 |
|
|
*/
|
| 394 |
|
|
if (ip->ip_off & IP_DF) {
|
| 395 |
|
|
error = EMSGSIZE;
|
| 396 |
|
|
/*
|
| 397 |
|
|
* This case can happen if the user changed the MTU
|
| 398 |
|
|
* of an interface after enabling IP on it. Because
|
| 399 |
|
|
* most netifs don't keep track of routes pointing to
|
| 400 |
|
|
* them, there is no way for one to update all its
|
| 401 |
|
|
* routes when the MTU is changed.
|
| 402 |
|
|
*/
|
| 403 |
|
|
if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
|
| 404 |
|
|
&& !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
|
| 405 |
|
|
&& (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
|
| 406 |
|
|
ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
|
| 407 |
|
|
}
|
| 408 |
|
|
ipstat.ips_cantfrag++;
|
| 409 |
|
|
goto bad;
|
| 410 |
|
|
}
|
| 411 |
|
|
len = (ifp->if_mtu - hlen) &~ 7;
|
| 412 |
|
|
if (len < 8) {
|
| 413 |
|
|
error = EMSGSIZE;
|
| 414 |
|
|
goto bad;
|
| 415 |
|
|
}
|
| 416 |
|
|
|
| 417 |
|
|
{
|
| 418 |
|
|
int mhlen, firstlen = len;
|
| 419 |
|
|
struct mbuf **mnext = &m->m_nextpkt;
|
| 420 |
|
|
|
| 421 |
|
|
/*
|
| 422 |
|
|
* Loop through length of segment after first fragment,
|
| 423 |
|
|
* make new header and copy data of each part and link onto chain.
|
| 424 |
|
|
*/
|
| 425 |
|
|
m0 = m;
|
| 426 |
|
|
mhlen = sizeof (struct ip);
|
| 427 |
|
|
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
|
| 428 |
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
| 429 |
|
|
if (m == 0) {
|
| 430 |
|
|
error = ENOBUFS;
|
| 431 |
|
|
ipstat.ips_odropped++;
|
| 432 |
|
|
goto sendorfree;
|
| 433 |
|
|
}
|
| 434 |
|
|
m->m_data += max_linkhdr;
|
| 435 |
|
|
mhip = mtod(m, struct ip *);
|
| 436 |
|
|
*mhip = *ip;
|
| 437 |
|
|
if (hlen > sizeof (struct ip)) {
|
| 438 |
|
|
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
| 439 |
|
|
mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
|
| 440 |
|
|
}
|
| 441 |
|
|
m->m_len = mhlen;
|
| 442 |
|
|
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
|
| 443 |
|
|
if (ip->ip_off & IP_MF)
|
| 444 |
|
|
mhip->ip_off |= IP_MF;
|
| 445 |
|
|
if (off + len >= (u_short)ip->ip_len)
|
| 446 |
|
|
len = (u_short)ip->ip_len - off;
|
| 447 |
|
|
else
|
| 448 |
|
|
mhip->ip_off |= IP_MF;
|
| 449 |
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
| 450 |
|
|
m->m_next = m_copy(m0, off, len);
|
| 451 |
|
|
if (m->m_next == 0) {
|
| 452 |
|
|
(void) m_free(m);
|
| 453 |
|
|
error = ENOBUFS; /* ??? */
|
| 454 |
|
|
ipstat.ips_odropped++;
|
| 455 |
|
|
goto sendorfree;
|
| 456 |
|
|
}
|
| 457 |
|
|
m->m_pkthdr.len = mhlen + len;
|
| 458 |
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
| 459 |
|
|
mhip->ip_off = htons((u_short)mhip->ip_off);
|
| 460 |
|
|
mhip->ip_sum = 0;
|
| 461 |
|
|
if (mhip->ip_vhl == IP_VHL_BORING) {
|
| 462 |
|
|
mhip->ip_sum = in_cksum_hdr(mhip);
|
| 463 |
|
|
} else {
|
| 464 |
|
|
mhip->ip_sum = in_cksum(m, mhlen);
|
| 465 |
|
|
}
|
| 466 |
|
|
*mnext = m;
|
| 467 |
|
|
mnext = &m->m_nextpkt;
|
| 468 |
|
|
ipstat.ips_ofragments++;
|
| 469 |
|
|
}
|
| 470 |
|
|
/*
|
| 471 |
|
|
* Update first fragment by trimming what's been copied out
|
| 472 |
|
|
* and updating header, then send each fragment (in order).
|
| 473 |
|
|
*/
|
| 474 |
|
|
m = m0;
|
| 475 |
|
|
m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
|
| 476 |
|
|
m->m_pkthdr.len = hlen + firstlen;
|
| 477 |
|
|
ip->ip_len = htons((u_short)m->m_pkthdr.len);
|
| 478 |
|
|
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
|
| 479 |
|
|
ip->ip_sum = 0;
|
| 480 |
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
| 481 |
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
| 482 |
|
|
} else {
|
| 483 |
|
|
ip->ip_sum = in_cksum(m, hlen);
|
| 484 |
|
|
}
|
| 485 |
|
|
sendorfree:
|
| 486 |
|
|
for (m = m0; m; m = m0) {
|
| 487 |
|
|
m0 = m->m_nextpkt;
|
| 488 |
|
|
m->m_nextpkt = 0;
|
| 489 |
|
|
if (error == 0)
|
| 490 |
|
|
error = (*ifp->if_output)(ifp, m,
|
| 491 |
|
|
(struct sockaddr *)dst, ro->ro_rt);
|
| 492 |
|
|
else
|
| 493 |
|
|
m_freem(m);
|
| 494 |
|
|
}
|
| 495 |
|
|
|
| 496 |
|
|
if (error == 0)
|
| 497 |
|
|
ipstat.ips_fragmented++;
|
| 498 |
|
|
}
|
| 499 |
|
|
done:
|
| 500 |
|
|
return (error);
|
| 501 |
|
|
bad:
|
| 502 |
|
|
m_freem(m0);
|
| 503 |
|
|
goto done;
|
| 504 |
|
|
}
|
| 505 |
|
|
|
| 506 |
|
|
/*
|
| 507 |
|
|
* Insert IP options into preformed packet.
|
| 508 |
|
|
* Adjust IP destination as required for IP source routing,
|
| 509 |
|
|
* as indicated by a non-zero in_addr at the start of the options.
|
| 510 |
|
|
*
|
| 511 |
|
|
* XXX This routine assumes that the packet has no options in place.
|
| 512 |
|
|
*/
|
| 513 |
|
|
static struct mbuf *
|
| 514 |
|
|
ip_insertoptions(m, opt, phlen)
|
| 515 |
|
|
register struct mbuf *m;
|
| 516 |
|
|
struct mbuf *opt;
|
| 517 |
|
|
int *phlen;
|
| 518 |
|
|
{
|
| 519 |
|
|
register struct ipoption *p = mtod(opt, struct ipoption *);
|
| 520 |
|
|
struct mbuf *n;
|
| 521 |
|
|
register struct ip *ip = mtod(m, struct ip *);
|
| 522 |
|
|
unsigned optlen;
|
| 523 |
|
|
|
| 524 |
|
|
optlen = opt->m_len - sizeof(p->ipopt_dst);
|
| 525 |
|
|
if (optlen + (u_short)ip->ip_len > IP_MAXPACKET)
|
| 526 |
|
|
return (m); /* XXX should fail */
|
| 527 |
|
|
if (p->ipopt_dst.s_addr)
|
| 528 |
|
|
ip->ip_dst = p->ipopt_dst;
|
| 529 |
|
|
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
|
| 530 |
|
|
MGETHDR(n, M_DONTWAIT, MT_HEADER);
|
| 531 |
|
|
if (n == 0)
|
| 532 |
|
|
return (m);
|
| 533 |
|
|
n->m_pkthdr.len = m->m_pkthdr.len + optlen;
|
| 534 |
|
|
m->m_len -= sizeof(struct ip);
|
| 535 |
|
|
m->m_data += sizeof(struct ip);
|
| 536 |
|
|
n->m_next = m;
|
| 537 |
|
|
m = n;
|
| 538 |
|
|
m->m_len = optlen + sizeof(struct ip);
|
| 539 |
|
|
m->m_data += max_linkhdr;
|
| 540 |
|
|
(void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
|
| 541 |
|
|
} else {
|
| 542 |
|
|
m->m_data -= optlen;
|
| 543 |
|
|
m->m_len += optlen;
|
| 544 |
|
|
m->m_pkthdr.len += optlen;
|
| 545 |
|
|
ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
|
| 546 |
|
|
}
|
| 547 |
|
|
ip = mtod(m, struct ip *);
|
| 548 |
|
|
bcopy(p->ipopt_list, ip + 1, optlen);
|
| 549 |
|
|
*phlen = sizeof(struct ip) + optlen;
|
| 550 |
|
|
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
|
| 551 |
|
|
ip->ip_len += optlen;
|
| 552 |
|
|
return (m);
|
| 553 |
|
|
}
|
| 554 |
|
|
|
| 555 |
|
|
/*
|
| 556 |
|
|
* Copy options from ip to jp,
|
| 557 |
|
|
* omitting those not copied during fragmentation.
|
| 558 |
|
|
*/
|
| 559 |
|
|
static int
|
| 560 |
|
|
ip_optcopy(ip, jp)
|
| 561 |
|
|
struct ip *ip, *jp;
|
| 562 |
|
|
{
|
| 563 |
|
|
register u_char *cp, *dp;
|
| 564 |
|
|
int opt, optlen, cnt;
|
| 565 |
|
|
|
| 566 |
|
|
cp = (u_char *)(ip + 1);
|
| 567 |
|
|
dp = (u_char *)(jp + 1);
|
| 568 |
|
|
cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
|
| 569 |
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
| 570 |
|
|
opt = cp[0];
|
| 571 |
|
|
if (opt == IPOPT_EOL)
|
| 572 |
|
|
break;
|
| 573 |
|
|
if (opt == IPOPT_NOP) {
|
| 574 |
|
|
/* Preserve for IP mcast tunnel's LSRR alignment. */
|
| 575 |
|
|
*dp++ = IPOPT_NOP;
|
| 576 |
|
|
optlen = 1;
|
| 577 |
|
|
continue;
|
| 578 |
|
|
} else
|
| 579 |
|
|
optlen = cp[IPOPT_OLEN];
|
| 580 |
|
|
/* bogus lengths should have been caught by ip_dooptions */
|
| 581 |
|
|
if (optlen > cnt)
|
| 582 |
|
|
optlen = cnt;
|
| 583 |
|
|
if (IPOPT_COPIED(opt)) {
|
| 584 |
|
|
bcopy(cp, dp, optlen);
|
| 585 |
|
|
dp += optlen;
|
| 586 |
|
|
}
|
| 587 |
|
|
}
|
| 588 |
|
|
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
|
| 589 |
|
|
*dp++ = IPOPT_EOL;
|
| 590 |
|
|
return (optlen);
|
| 591 |
|
|
}
|
| 592 |
|
|
|
| 593 |
|
|
/*
|
| 594 |
|
|
* IP socket option processing.
|
| 595 |
|
|
*/
|
| 596 |
|
|
int
|
| 597 |
|
|
ip_ctloutput(op, so, level, optname, mp)
|
| 598 |
|
|
int op;
|
| 599 |
|
|
struct socket *so;
|
| 600 |
|
|
int level, optname;
|
| 601 |
|
|
struct mbuf **mp;
|
| 602 |
|
|
{
|
| 603 |
|
|
register struct inpcb *inp = sotoinpcb(so);
|
| 604 |
|
|
register struct mbuf *m = *mp;
|
| 605 |
|
|
register int optval = 0;
|
| 606 |
|
|
int error = 0;
|
| 607 |
|
|
|
| 608 |
|
|
if (level != IPPROTO_IP) {
|
| 609 |
|
|
error = EINVAL;
|
| 610 |
|
|
if (op == PRCO_SETOPT && *mp)
|
| 611 |
|
|
(void) m_free(*mp);
|
| 612 |
|
|
} else switch (op) {
|
| 613 |
|
|
|
| 614 |
|
|
case PRCO_SETOPT:
|
| 615 |
|
|
switch (optname) {
|
| 616 |
|
|
case IP_OPTIONS:
|
| 617 |
|
|
#ifdef notyet
|
| 618 |
|
|
case IP_RETOPTS:
|
| 619 |
|
|
return (ip_pcbopts(optname, &inp->inp_options, m));
|
| 620 |
|
|
#else
|
| 621 |
|
|
return (ip_pcbopts(&inp->inp_options, m));
|
| 622 |
|
|
#endif
|
| 623 |
|
|
|
| 624 |
|
|
case IP_TOS:
|
| 625 |
|
|
case IP_TTL:
|
| 626 |
|
|
case IP_RECVOPTS:
|
| 627 |
|
|
case IP_RECVRETOPTS:
|
| 628 |
|
|
case IP_RECVDSTADDR:
|
| 629 |
|
|
case IP_RECVIF:
|
| 630 |
|
|
if (m == 0 || m->m_len != sizeof(int))
|
| 631 |
|
|
error = EINVAL;
|
| 632 |
|
|
else {
|
| 633 |
|
|
optval = *mtod(m, int *);
|
| 634 |
|
|
switch (optname) {
|
| 635 |
|
|
|
| 636 |
|
|
case IP_TOS:
|
| 637 |
|
|
inp->inp_ip_tos = optval;
|
| 638 |
|
|
break;
|
| 639 |
|
|
|
| 640 |
|
|
case IP_TTL:
|
| 641 |
|
|
inp->inp_ip_ttl = optval;
|
| 642 |
|
|
break;
|
| 643 |
|
|
#define OPTSET(bit) \
|
| 644 |
|
|
if (optval) \
|
| 645 |
|
|
inp->inp_flags |= bit; \
|
| 646 |
|
|
else \
|
| 647 |
|
|
inp->inp_flags &= ~bit;
|
| 648 |
|
|
|
| 649 |
|
|
case IP_RECVOPTS:
|
| 650 |
|
|
OPTSET(INP_RECVOPTS);
|
| 651 |
|
|
break;
|
| 652 |
|
|
|
| 653 |
|
|
case IP_RECVRETOPTS:
|
| 654 |
|
|
OPTSET(INP_RECVRETOPTS);
|
| 655 |
|
|
break;
|
| 656 |
|
|
|
| 657 |
|
|
case IP_RECVDSTADDR:
|
| 658 |
|
|
OPTSET(INP_RECVDSTADDR);
|
| 659 |
|
|
break;
|
| 660 |
|
|
|
| 661 |
|
|
case IP_RECVIF:
|
| 662 |
|
|
OPTSET(INP_RECVIF);
|
| 663 |
|
|
break;
|
| 664 |
|
|
}
|
| 665 |
|
|
}
|
| 666 |
|
|
break;
|
| 667 |
|
|
#undef OPTSET
|
| 668 |
|
|
|
| 669 |
|
|
case IP_MULTICAST_IF:
|
| 670 |
|
|
case IP_MULTICAST_VIF:
|
| 671 |
|
|
case IP_MULTICAST_TTL:
|
| 672 |
|
|
case IP_MULTICAST_LOOP:
|
| 673 |
|
|
case IP_ADD_MEMBERSHIP:
|
| 674 |
|
|
case IP_DROP_MEMBERSHIP:
|
| 675 |
|
|
error = ip_setmoptions(optname, &inp->inp_moptions, m);
|
| 676 |
|
|
break;
|
| 677 |
|
|
|
| 678 |
|
|
case IP_PORTRANGE:
|
| 679 |
|
|
if (m == 0 || m->m_len != sizeof(int))
|
| 680 |
|
|
error = EINVAL;
|
| 681 |
|
|
else {
|
| 682 |
|
|
optval = *mtod(m, int *);
|
| 683 |
|
|
|
| 684 |
|
|
switch (optval) {
|
| 685 |
|
|
|
| 686 |
|
|
case IP_PORTRANGE_DEFAULT:
|
| 687 |
|
|
inp->inp_flags &= ~(INP_LOWPORT);
|
| 688 |
|
|
inp->inp_flags &= ~(INP_HIGHPORT);
|
| 689 |
|
|
break;
|
| 690 |
|
|
|
| 691 |
|
|
case IP_PORTRANGE_HIGH:
|
| 692 |
|
|
inp->inp_flags &= ~(INP_LOWPORT);
|
| 693 |
|
|
inp->inp_flags |= INP_HIGHPORT;
|
| 694 |
|
|
break;
|
| 695 |
|
|
|
| 696 |
|
|
case IP_PORTRANGE_LOW:
|
| 697 |
|
|
inp->inp_flags &= ~(INP_HIGHPORT);
|
| 698 |
|
|
inp->inp_flags |= INP_LOWPORT;
|
| 699 |
|
|
break;
|
| 700 |
|
|
|
| 701 |
|
|
default:
|
| 702 |
|
|
error = EINVAL;
|
| 703 |
|
|
break;
|
| 704 |
|
|
}
|
| 705 |
|
|
}
|
| 706 |
|
|
break;
|
| 707 |
|
|
|
| 708 |
|
|
default:
|
| 709 |
|
|
error = ENOPROTOOPT;
|
| 710 |
|
|
break;
|
| 711 |
|
|
}
|
| 712 |
|
|
if (m)
|
| 713 |
|
|
(void)m_free(m);
|
| 714 |
|
|
break;
|
| 715 |
|
|
|
| 716 |
|
|
case PRCO_GETOPT:
|
| 717 |
|
|
switch (optname) {
|
| 718 |
|
|
case IP_OPTIONS:
|
| 719 |
|
|
case IP_RETOPTS:
|
| 720 |
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
| 721 |
|
|
if (inp->inp_options) {
|
| 722 |
|
|
m->m_len = inp->inp_options->m_len;
|
| 723 |
|
|
bcopy(mtod(inp->inp_options, void *),
|
| 724 |
|
|
mtod(m, void *), m->m_len);
|
| 725 |
|
|
} else
|
| 726 |
|
|
m->m_len = 0;
|
| 727 |
|
|
break;
|
| 728 |
|
|
|
| 729 |
|
|
case IP_TOS:
|
| 730 |
|
|
case IP_TTL:
|
| 731 |
|
|
case IP_RECVOPTS:
|
| 732 |
|
|
case IP_RECVRETOPTS:
|
| 733 |
|
|
case IP_RECVDSTADDR:
|
| 734 |
|
|
case IP_RECVIF:
|
| 735 |
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
| 736 |
|
|
m->m_len = sizeof(int);
|
| 737 |
|
|
switch (optname) {
|
| 738 |
|
|
|
| 739 |
|
|
case IP_TOS:
|
| 740 |
|
|
optval = inp->inp_ip_tos;
|
| 741 |
|
|
break;
|
| 742 |
|
|
|
| 743 |
|
|
case IP_TTL:
|
| 744 |
|
|
optval = inp->inp_ip_ttl;
|
| 745 |
|
|
break;
|
| 746 |
|
|
|
| 747 |
|
|
#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
|
| 748 |
|
|
|
| 749 |
|
|
case IP_RECVOPTS:
|
| 750 |
|
|
optval = OPTBIT(INP_RECVOPTS);
|
| 751 |
|
|
break;
|
| 752 |
|
|
|
| 753 |
|
|
case IP_RECVRETOPTS:
|
| 754 |
|
|
optval = OPTBIT(INP_RECVRETOPTS);
|
| 755 |
|
|
break;
|
| 756 |
|
|
|
| 757 |
|
|
case IP_RECVDSTADDR:
|
| 758 |
|
|
optval = OPTBIT(INP_RECVDSTADDR);
|
| 759 |
|
|
break;
|
| 760 |
|
|
|
| 761 |
|
|
case IP_RECVIF:
|
| 762 |
|
|
optval = OPTBIT(INP_RECVIF);
|
| 763 |
|
|
break;
|
| 764 |
|
|
}
|
| 765 |
|
|
*mtod(m, int *) = optval;
|
| 766 |
|
|
break;
|
| 767 |
|
|
|
| 768 |
|
|
case IP_MULTICAST_IF:
|
| 769 |
|
|
case IP_MULTICAST_VIF:
|
| 770 |
|
|
case IP_MULTICAST_TTL:
|
| 771 |
|
|
case IP_MULTICAST_LOOP:
|
| 772 |
|
|
case IP_ADD_MEMBERSHIP:
|
| 773 |
|
|
case IP_DROP_MEMBERSHIP:
|
| 774 |
|
|
error = ip_getmoptions(optname, inp->inp_moptions, mp);
|
| 775 |
|
|
break;
|
| 776 |
|
|
|
| 777 |
|
|
case IP_PORTRANGE:
|
| 778 |
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
| 779 |
|
|
m->m_len = sizeof(int);
|
| 780 |
|
|
|
| 781 |
|
|
if (inp->inp_flags & INP_HIGHPORT)
|
| 782 |
|
|
optval = IP_PORTRANGE_HIGH;
|
| 783 |
|
|
else if (inp->inp_flags & INP_LOWPORT)
|
| 784 |
|
|
optval = IP_PORTRANGE_LOW;
|
| 785 |
|
|
else
|
| 786 |
|
|
optval = 0;
|
| 787 |
|
|
|
| 788 |
|
|
*mtod(m, int *) = optval;
|
| 789 |
|
|
break;
|
| 790 |
|
|
|
| 791 |
|
|
default:
|
| 792 |
|
|
error = ENOPROTOOPT;
|
| 793 |
|
|
break;
|
| 794 |
|
|
}
|
| 795 |
|
|
break;
|
| 796 |
|
|
}
|
| 797 |
|
|
return (error);
|
| 798 |
|
|
}
|
| 799 |
|
|
|
| 800 |
|
|
/*
|
| 801 |
|
|
* Set up IP options in pcb for insertion in output packets.
|
| 802 |
|
|
* Store in mbuf with pointer in pcbopt, adding pseudo-option
|
| 803 |
|
|
* with destination address if source routed.
|
| 804 |
|
|
*/
|
| 805 |
|
|
static int
|
| 806 |
|
|
#ifdef notyet
|
| 807 |
|
|
ip_pcbopts(optname, pcbopt, m)
|
| 808 |
|
|
int optname;
|
| 809 |
|
|
#else
|
| 810 |
|
|
ip_pcbopts(pcbopt, m)
|
| 811 |
|
|
#endif
|
| 812 |
|
|
struct mbuf **pcbopt;
|
| 813 |
|
|
register struct mbuf *m;
|
| 814 |
|
|
{
|
| 815 |
|
|
register int cnt, optlen;
|
| 816 |
|
|
register u_char *cp;
|
| 817 |
|
|
u_char opt;
|
| 818 |
|
|
|
| 819 |
|
|
/* turn off any old options */
|
| 820 |
|
|
if (*pcbopt)
|
| 821 |
|
|
(void)m_free(*pcbopt);
|
| 822 |
|
|
*pcbopt = 0;
|
| 823 |
|
|
if (m == (struct mbuf *)0 || m->m_len == 0) {
|
| 824 |
|
|
/*
|
| 825 |
|
|
* Only turning off any previous options.
|
| 826 |
|
|
*/
|
| 827 |
|
|
if (m)
|
| 828 |
|
|
(void)m_free(m);
|
| 829 |
|
|
return (0);
|
| 830 |
|
|
}
|
| 831 |
|
|
|
| 832 |
|
|
#ifndef vax
|
| 833 |
|
|
if (m->m_len % sizeof(long))
|
| 834 |
|
|
goto bad;
|
| 835 |
|
|
#endif
|
| 836 |
|
|
/*
|
| 837 |
|
|
* IP first-hop destination address will be stored before
|
| 838 |
|
|
* actual options; move other options back
|
| 839 |
|
|
* and clear it when none present.
|
| 840 |
|
|
*/
|
| 841 |
|
|
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
|
| 842 |
|
|
goto bad;
|
| 843 |
|
|
cnt = m->m_len;
|
| 844 |
|
|
m->m_len += sizeof(struct in_addr);
|
| 845 |
|
|
cp = mtod(m, u_char *) + sizeof(struct in_addr);
|
| 846 |
|
|
ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
|
| 847 |
|
|
bzero(mtod(m, caddr_t), sizeof(struct in_addr));
|
| 848 |
|
|
|
| 849 |
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
| 850 |
|
|
opt = cp[IPOPT_OPTVAL];
|
| 851 |
|
|
if (opt == IPOPT_EOL)
|
| 852 |
|
|
break;
|
| 853 |
|
|
if (opt == IPOPT_NOP)
|
| 854 |
|
|
optlen = 1;
|
| 855 |
|
|
else {
|
| 856 |
|
|
optlen = cp[IPOPT_OLEN];
|
| 857 |
|
|
if (optlen <= IPOPT_OLEN || optlen > cnt)
|
| 858 |
|
|
goto bad;
|
| 859 |
|
|
}
|
| 860 |
|
|
switch (opt) {
|
| 861 |
|
|
|
| 862 |
|
|
default:
|
| 863 |
|
|
break;
|
| 864 |
|
|
|
| 865 |
|
|
case IPOPT_LSRR:
|
| 866 |
|
|
case IPOPT_SSRR:
|
| 867 |
|
|
/*
|
| 868 |
|
|
* user process specifies route as:
|
| 869 |
|
|
* ->A->B->C->D
|
| 870 |
|
|
* D must be our final destination (but we can't
|
| 871 |
|
|
* check that since we may not have connected yet).
|
| 872 |
|
|
* A is first hop destination, which doesn't appear in
|
| 873 |
|
|
* actual IP option, but is stored before the options.
|
| 874 |
|
|
*/
|
| 875 |
|
|
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
|
| 876 |
|
|
goto bad;
|
| 877 |
|
|
m->m_len -= sizeof(struct in_addr);
|
| 878 |
|
|
cnt -= sizeof(struct in_addr);
|
| 879 |
|
|
optlen -= sizeof(struct in_addr);
|
| 880 |
|
|
cp[IPOPT_OLEN] = optlen;
|
| 881 |
|
|
/*
|
| 882 |
|
|
* Move first hop before start of options.
|
| 883 |
|
|
*/
|
| 884 |
|
|
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
|
| 885 |
|
|
sizeof(struct in_addr));
|
| 886 |
|
|
/*
|
| 887 |
|
|
* Then copy rest of options back
|
| 888 |
|
|
* to close up the deleted entry.
|
| 889 |
|
|
*/
|
| 890 |
|
|
ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
|
| 891 |
|
|
sizeof(struct in_addr)),
|
| 892 |
|
|
(caddr_t)&cp[IPOPT_OFFSET+1],
|
| 893 |
|
|
(unsigned)cnt + sizeof(struct in_addr));
|
| 894 |
|
|
break;
|
| 895 |
|
|
}
|
| 896 |
|
|
}
|
| 897 |
|
|
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
|
| 898 |
|
|
goto bad;
|
| 899 |
|
|
*pcbopt = m;
|
| 900 |
|
|
return (0);
|
| 901 |
|
|
|
| 902 |
|
|
bad:
|
| 903 |
|
|
(void)m_free(m);
|
| 904 |
|
|
return (EINVAL);
|
| 905 |
|
|
}
|
| 906 |
|
|
|
| 907 |
|
|
/*
|
| 908 |
|
|
* Set the IP multicast options in response to user setsockopt().
|
| 909 |
|
|
*/
|
| 910 |
|
|
static int
|
| 911 |
|
|
ip_setmoptions(optname, imop, m)
|
| 912 |
|
|
int optname;
|
| 913 |
|
|
struct ip_moptions **imop;
|
| 914 |
|
|
struct mbuf *m;
|
| 915 |
|
|
{
|
| 916 |
|
|
register int error = 0;
|
| 917 |
|
|
u_char loop;
|
| 918 |
|
|
register int i;
|
| 919 |
|
|
struct in_addr addr;
|
| 920 |
|
|
register struct ip_mreq *mreq;
|
| 921 |
|
|
register struct ifnet *ifp;
|
| 922 |
|
|
register struct ip_moptions *imo = *imop;
|
| 923 |
|
|
struct route ro;
|
| 924 |
|
|
register struct sockaddr_in *dst;
|
| 925 |
|
|
int s;
|
| 926 |
|
|
|
| 927 |
|
|
if (imo == NULL) {
|
| 928 |
|
|
/*
|
| 929 |
|
|
* No multicast option buffer attached to the pcb;
|
| 930 |
|
|
* allocate one and initialize to default values.
|
| 931 |
|
|
*/
|
| 932 |
|
|
imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS,
|
| 933 |
|
|
M_WAITOK);
|
| 934 |
|
|
|
| 935 |
|
|
if (imo == NULL)
|
| 936 |
|
|
return (ENOBUFS);
|
| 937 |
|
|
*imop = imo;
|
| 938 |
|
|
imo->imo_multicast_ifp = NULL;
|
| 939 |
|
|
imo->imo_multicast_vif = -1;
|
| 940 |
|
|
imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
|
| 941 |
|
|
imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
|
| 942 |
|
|
imo->imo_num_memberships = 0;
|
| 943 |
|
|
}
|
| 944 |
|
|
|
| 945 |
|
|
switch (optname) {
|
| 946 |
|
|
/* store an index number for the vif you wanna use in the send */
|
| 947 |
|
|
case IP_MULTICAST_VIF:
|
| 948 |
|
|
if (!legal_vif_num) {
|
| 949 |
|
|
error = EOPNOTSUPP;
|
| 950 |
|
|
break;
|
| 951 |
|
|
}
|
| 952 |
|
|
if (m == NULL || m->m_len != sizeof(int)) {
|
| 953 |
|
|
error = EINVAL;
|
| 954 |
|
|
break;
|
| 955 |
|
|
}
|
| 956 |
|
|
i = *(mtod(m, int *));
|
| 957 |
|
|
if (!legal_vif_num(i) && (i != -1)) {
|
| 958 |
|
|
error = EINVAL;
|
| 959 |
|
|
break;
|
| 960 |
|
|
}
|
| 961 |
|
|
imo->imo_multicast_vif = i;
|
| 962 |
|
|
break;
|
| 963 |
|
|
|
| 964 |
|
|
case IP_MULTICAST_IF:
|
| 965 |
|
|
/*
|
| 966 |
|
|
* Select the interface for outgoing multicast packets.
|
| 967 |
|
|
*/
|
| 968 |
|
|
if (m == NULL || m->m_len != sizeof(struct in_addr)) {
|
| 969 |
|
|
error = EINVAL;
|
| 970 |
|
|
break;
|
| 971 |
|
|
}
|
| 972 |
|
|
addr = *(mtod(m, struct in_addr *));
|
| 973 |
|
|
/*
|
| 974 |
|
|
* INADDR_ANY is used to remove a previous selection.
|
| 975 |
|
|
* When no interface is selected, a default one is
|
| 976 |
|
|
* chosen every time a multicast packet is sent.
|
| 977 |
|
|
*/
|
| 978 |
|
|
if (addr.s_addr == INADDR_ANY) {
|
| 979 |
|
|
imo->imo_multicast_ifp = NULL;
|
| 980 |
|
|
break;
|
| 981 |
|
|
}
|
| 982 |
|
|
/*
|
| 983 |
|
|
* The selected interface is identified by its local
|
| 984 |
|
|
* IP address. Find the interface and confirm that
|
| 985 |
|
|
* it supports multicasting.
|
| 986 |
|
|
*/
|
| 987 |
|
|
s = splimp();
|
| 988 |
|
|
INADDR_TO_IFP(addr, ifp);
|
| 989 |
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
| 990 |
|
|
splx(s);
|
| 991 |
|
|
error = EADDRNOTAVAIL;
|
| 992 |
|
|
break;
|
| 993 |
|
|
}
|
| 994 |
|
|
imo->imo_multicast_ifp = ifp;
|
| 995 |
|
|
splx(s);
|
| 996 |
|
|
break;
|
| 997 |
|
|
|
| 998 |
|
|
case IP_MULTICAST_TTL:
|
| 999 |
|
|
/*
|
| 1000 |
|
|
* Set the IP time-to-live for outgoing multicast packets.
|
| 1001 |
|
|
*/
|
| 1002 |
|
|
if (m == NULL || m->m_len != 1) {
|
| 1003 |
|
|
error = EINVAL;
|
| 1004 |
|
|
break;
|
| 1005 |
|
|
}
|
| 1006 |
|
|
imo->imo_multicast_ttl = *(mtod(m, u_char *));
|
| 1007 |
|
|
break;
|
| 1008 |
|
|
|
| 1009 |
|
|
case IP_MULTICAST_LOOP:
|
| 1010 |
|
|
/*
|
| 1011 |
|
|
* Set the loopback flag for outgoing multicast packets.
|
| 1012 |
|
|
* Must be zero or one.
|
| 1013 |
|
|
*/
|
| 1014 |
|
|
if (m == NULL || m->m_len != 1 ||
|
| 1015 |
|
|
(loop = *(mtod(m, u_char *))) > 1) {
|
| 1016 |
|
|
error = EINVAL;
|
| 1017 |
|
|
break;
|
| 1018 |
|
|
}
|
| 1019 |
|
|
imo->imo_multicast_loop = loop;
|
| 1020 |
|
|
break;
|
| 1021 |
|
|
|
| 1022 |
|
|
case IP_ADD_MEMBERSHIP:
|
| 1023 |
|
|
/*
|
| 1024 |
|
|
* Add a multicast group membership.
|
| 1025 |
|
|
* Group must be a valid IP multicast address.
|
| 1026 |
|
|
*/
|
| 1027 |
|
|
if (m == NULL || m->m_len != sizeof(struct ip_mreq)) {
|
| 1028 |
|
|
error = EINVAL;
|
| 1029 |
|
|
break;
|
| 1030 |
|
|
}
|
| 1031 |
|
|
mreq = mtod(m, struct ip_mreq *);
|
| 1032 |
|
|
if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
|
| 1033 |
|
|
error = EINVAL;
|
| 1034 |
|
|
break;
|
| 1035 |
|
|
}
|
| 1036 |
|
|
s = splimp();
|
| 1037 |
|
|
/*
|
| 1038 |
|
|
* If no interface address was provided, use the interface of
|
| 1039 |
|
|
* the route to the given multicast address.
|
| 1040 |
|
|
*/
|
| 1041 |
|
|
if (mreq->imr_interface.s_addr == INADDR_ANY) {
|
| 1042 |
|
|
bzero((caddr_t)&ro, sizeof(ro));
|
| 1043 |
|
|
dst = (struct sockaddr_in *)&ro.ro_dst;
|
| 1044 |
|
|
dst->sin_len = sizeof(*dst);
|
| 1045 |
|
|
dst->sin_family = AF_INET;
|
| 1046 |
|
|
dst->sin_addr = mreq->imr_multiaddr;
|
| 1047 |
|
|
rtalloc(&ro);
|
| 1048 |
|
|
if (ro.ro_rt == NULL) {
|
| 1049 |
|
|
error = EADDRNOTAVAIL;
|
| 1050 |
|
|
splx(s);
|
| 1051 |
|
|
break;
|
| 1052 |
|
|
}
|
| 1053 |
|
|
ifp = ro.ro_rt->rt_ifp;
|
| 1054 |
|
|
rtfree(ro.ro_rt);
|
| 1055 |
|
|
}
|
| 1056 |
|
|
else {
|
| 1057 |
|
|
INADDR_TO_IFP(mreq->imr_interface, ifp);
|
| 1058 |
|
|
}
|
| 1059 |
|
|
|
| 1060 |
|
|
/*
|
| 1061 |
|
|
* See if we found an interface, and confirm that it
|
| 1062 |
|
|
* supports multicast.
|
| 1063 |
|
|
*/
|
| 1064 |
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
| 1065 |
|
|
error = EADDRNOTAVAIL;
|
| 1066 |
|
|
splx(s);
|
| 1067 |
|
|
break;
|
| 1068 |
|
|
}
|
| 1069 |
|
|
/*
|
| 1070 |
|
|
* See if the membership already exists or if all the
|
| 1071 |
|
|
* membership slots are full.
|
| 1072 |
|
|
*/
|
| 1073 |
|
|
for (i = 0; i < imo->imo_num_memberships; ++i) {
|
| 1074 |
|
|
if (imo->imo_membership[i]->inm_ifp == ifp &&
|
| 1075 |
|
|
imo->imo_membership[i]->inm_addr.s_addr
|
| 1076 |
|
|
== mreq->imr_multiaddr.s_addr)
|
| 1077 |
|
|
break;
|
| 1078 |
|
|
}
|
| 1079 |
|
|
if (i < imo->imo_num_memberships) {
|
| 1080 |
|
|
error = EADDRINUSE;
|
| 1081 |
|
|
splx(s);
|
| 1082 |
|
|
break;
|
| 1083 |
|
|
}
|
| 1084 |
|
|
if (i == IP_MAX_MEMBERSHIPS) {
|
| 1085 |
|
|
error = ETOOMANYREFS;
|
| 1086 |
|
|
splx(s);
|
| 1087 |
|
|
break;
|
| 1088 |
|
|
}
|
| 1089 |
|
|
/*
|
| 1090 |
|
|
* Everything looks good; add a new record to the multicast
|
| 1091 |
|
|
* address list for the given interface.
|
| 1092 |
|
|
*/
|
| 1093 |
|
|
if ((imo->imo_membership[i] =
|
| 1094 |
|
|
in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) {
|
| 1095 |
|
|
error = ENOBUFS;
|
| 1096 |
|
|
splx(s);
|
| 1097 |
|
|
break;
|
| 1098 |
|
|
}
|
| 1099 |
|
|
++imo->imo_num_memberships;
|
| 1100 |
|
|
splx(s);
|
| 1101 |
|
|
break;
|
| 1102 |
|
|
|
| 1103 |
|
|
case IP_DROP_MEMBERSHIP:
|
| 1104 |
|
|
/*
|
| 1105 |
|
|
* Drop a multicast group membership.
|
| 1106 |
|
|
* Group must be a valid IP multicast address.
|
| 1107 |
|
|
*/
|
| 1108 |
|
|
if (m == NULL || m->m_len != sizeof(struct ip_mreq)) {
|
| 1109 |
|
|
error = EINVAL;
|
| 1110 |
|
|
break;
|
| 1111 |
|
|
}
|
| 1112 |
|
|
mreq = mtod(m, struct ip_mreq *);
|
| 1113 |
|
|
if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
|
| 1114 |
|
|
error = EINVAL;
|
| 1115 |
|
|
break;
|
| 1116 |
|
|
}
|
| 1117 |
|
|
|
| 1118 |
|
|
s = splimp();
|
| 1119 |
|
|
/*
|
| 1120 |
|
|
* If an interface address was specified, get a pointer
|
| 1121 |
|
|
* to its ifnet structure.
|
| 1122 |
|
|
*/
|
| 1123 |
|
|
if (mreq->imr_interface.s_addr == INADDR_ANY)
|
| 1124 |
|
|
ifp = NULL;
|
| 1125 |
|
|
else {
|
| 1126 |
|
|
INADDR_TO_IFP(mreq->imr_interface, ifp);
|
| 1127 |
|
|
if (ifp == NULL) {
|
| 1128 |
|
|
error = EADDRNOTAVAIL;
|
| 1129 |
|
|
splx(s);
|
| 1130 |
|
|
break;
|
| 1131 |
|
|
}
|
| 1132 |
|
|
}
|
| 1133 |
|
|
/*
|
| 1134 |
|
|
* Find the membership in the membership array.
|
| 1135 |
|
|
*/
|
| 1136 |
|
|
for (i = 0; i < imo->imo_num_memberships; ++i) {
|
| 1137 |
|
|
if ((ifp == NULL ||
|
| 1138 |
|
|
imo->imo_membership[i]->inm_ifp == ifp) &&
|
| 1139 |
|
|
imo->imo_membership[i]->inm_addr.s_addr ==
|
| 1140 |
|
|
mreq->imr_multiaddr.s_addr)
|
| 1141 |
|
|
break;
|
| 1142 |
|
|
}
|
| 1143 |
|
|
if (i == imo->imo_num_memberships) {
|
| 1144 |
|
|
error = EADDRNOTAVAIL;
|
| 1145 |
|
|
splx(s);
|
| 1146 |
|
|
break;
|
| 1147 |
|
|
}
|
| 1148 |
|
|
/*
|
| 1149 |
|
|
* Give up the multicast address record to which the
|
| 1150 |
|
|
* membership points.
|
| 1151 |
|
|
*/
|
| 1152 |
|
|
in_delmulti(imo->imo_membership[i]);
|
| 1153 |
|
|
/*
|
| 1154 |
|
|
* Remove the gap in the membership array.
|
| 1155 |
|
|
*/
|
| 1156 |
|
|
for (++i; i < imo->imo_num_memberships; ++i)
|
| 1157 |
|
|
imo->imo_membership[i-1] = imo->imo_membership[i];
|
| 1158 |
|
|
--imo->imo_num_memberships;
|
| 1159 |
|
|
splx(s);
|
| 1160 |
|
|
break;
|
| 1161 |
|
|
|
| 1162 |
|
|
default:
|
| 1163 |
|
|
error = EOPNOTSUPP;
|
| 1164 |
|
|
break;
|
| 1165 |
|
|
}
|
| 1166 |
|
|
|
| 1167 |
|
|
/*
|
| 1168 |
|
|
* If all options have default values, no need to keep the mbuf.
|
| 1169 |
|
|
*/
|
| 1170 |
|
|
if (imo->imo_multicast_ifp == NULL &&
|
| 1171 |
|
|
imo->imo_multicast_vif == -1 &&
|
| 1172 |
|
|
imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
|
| 1173 |
|
|
imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
|
| 1174 |
|
|
imo->imo_num_memberships == 0) {
|
| 1175 |
|
|
free(*imop, M_IPMOPTS);
|
| 1176 |
|
|
*imop = NULL;
|
| 1177 |
|
|
}
|
| 1178 |
|
|
|
| 1179 |
|
|
return (error);
|
| 1180 |
|
|
}
|
| 1181 |
|
|
|
| 1182 |
|
|
/*
|
| 1183 |
|
|
* Return the IP multicast options in response to user getsockopt().
|
| 1184 |
|
|
*/
|
| 1185 |
|
|
static int
|
| 1186 |
|
|
ip_getmoptions(optname, imo, mp)
|
| 1187 |
|
|
int optname;
|
| 1188 |
|
|
register struct ip_moptions *imo;
|
| 1189 |
|
|
register struct mbuf **mp;
|
| 1190 |
|
|
{
|
| 1191 |
|
|
u_char *ttl;
|
| 1192 |
|
|
u_char *loop;
|
| 1193 |
|
|
struct in_addr *addr;
|
| 1194 |
|
|
struct in_ifaddr *ia;
|
| 1195 |
|
|
|
| 1196 |
|
|
*mp = m_get(M_WAIT, MT_SOOPTS);
|
| 1197 |
|
|
|
| 1198 |
|
|
switch (optname) {
|
| 1199 |
|
|
|
| 1200 |
|
|
case IP_MULTICAST_VIF:
|
| 1201 |
|
|
if (imo != NULL)
|
| 1202 |
|
|
*(mtod(*mp, int *)) = imo->imo_multicast_vif;
|
| 1203 |
|
|
else
|
| 1204 |
|
|
*(mtod(*mp, int *)) = -1;
|
| 1205 |
|
|
(*mp)->m_len = sizeof(int);
|
| 1206 |
|
|
return(0);
|
| 1207 |
|
|
|
| 1208 |
|
|
case IP_MULTICAST_IF:
|
| 1209 |
|
|
addr = mtod(*mp, struct in_addr *);
|
| 1210 |
|
|
(*mp)->m_len = sizeof(struct in_addr);
|
| 1211 |
|
|
if (imo == NULL || imo->imo_multicast_ifp == NULL)
|
| 1212 |
|
|
addr->s_addr = INADDR_ANY;
|
| 1213 |
|
|
else {
|
| 1214 |
|
|
IFP_TO_IA(imo->imo_multicast_ifp, ia);
|
| 1215 |
|
|
addr->s_addr = (ia == NULL) ? INADDR_ANY
|
| 1216 |
|
|
: IA_SIN(ia)->sin_addr.s_addr;
|
| 1217 |
|
|
}
|
| 1218 |
|
|
return (0);
|
| 1219 |
|
|
|
| 1220 |
|
|
case IP_MULTICAST_TTL:
|
| 1221 |
|
|
ttl = mtod(*mp, u_char *);
|
| 1222 |
|
|
(*mp)->m_len = 1;
|
| 1223 |
|
|
*ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL
|
| 1224 |
|
|
: imo->imo_multicast_ttl;
|
| 1225 |
|
|
return (0);
|
| 1226 |
|
|
|
| 1227 |
|
|
case IP_MULTICAST_LOOP:
|
| 1228 |
|
|
loop = mtod(*mp, u_char *);
|
| 1229 |
|
|
(*mp)->m_len = 1;
|
| 1230 |
|
|
*loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP
|
| 1231 |
|
|
: imo->imo_multicast_loop;
|
| 1232 |
|
|
return (0);
|
| 1233 |
|
|
|
| 1234 |
|
|
default:
|
| 1235 |
|
|
return (EOPNOTSUPP);
|
| 1236 |
|
|
}
|
| 1237 |
|
|
}
|
| 1238 |
|
|
|
| 1239 |
|
|
/*
|
| 1240 |
|
|
* Discard the IP multicast options.
|
| 1241 |
|
|
*/
|
| 1242 |
|
|
void
|
| 1243 |
|
|
ip_freemoptions(imo)
|
| 1244 |
|
|
register struct ip_moptions *imo;
|
| 1245 |
|
|
{
|
| 1246 |
|
|
register int i;
|
| 1247 |
|
|
|
| 1248 |
|
|
if (imo != NULL) {
|
| 1249 |
|
|
for (i = 0; i < imo->imo_num_memberships; ++i)
|
| 1250 |
|
|
in_delmulti(imo->imo_membership[i]);
|
| 1251 |
|
|
free(imo, M_IPMOPTS);
|
| 1252 |
|
|
}
|
| 1253 |
|
|
}
|
| 1254 |
|
|
|
| 1255 |
|
|
/*
|
| 1256 |
|
|
* Routine called from ip_output() to loop back a copy of an IP multicast
|
| 1257 |
|
|
* packet to the input queue of a specified interface. Note that this
|
| 1258 |
|
|
* calls the output routine of the loopback "driver", but with an interface
|
| 1259 |
|
|
* pointer that might NOT be a loopback interface -- evil, but easier than
|
| 1260 |
|
|
* replicating that code here.
|
| 1261 |
|
|
*/
|
| 1262 |
|
|
static void
|
| 1263 |
|
|
ip_mloopback(ifp, m, dst, hlen)
|
| 1264 |
|
|
struct ifnet *ifp;
|
| 1265 |
|
|
register struct mbuf *m;
|
| 1266 |
|
|
register struct sockaddr_in *dst;
|
| 1267 |
|
|
int hlen;
|
| 1268 |
|
|
{
|
| 1269 |
|
|
register struct ip *ip;
|
| 1270 |
|
|
struct mbuf *copym;
|
| 1271 |
|
|
|
| 1272 |
|
|
copym = m_copy(m, 0, M_COPYALL);
|
| 1273 |
|
|
if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
|
| 1274 |
|
|
copym = m_pullup(copym, hlen);
|
| 1275 |
|
|
if (copym != NULL) {
|
| 1276 |
|
|
/*
|
| 1277 |
|
|
* We don't bother to fragment if the IP length is greater
|
| 1278 |
|
|
* than the interface's MTU. Can this possibly matter?
|
| 1279 |
|
|
*/
|
| 1280 |
|
|
ip = mtod(copym, struct ip *);
|
| 1281 |
|
|
ip->ip_len = htons((u_short)ip->ip_len);
|
| 1282 |
|
|
ip->ip_off = htons((u_short)ip->ip_off);
|
| 1283 |
|
|
ip->ip_sum = 0;
|
| 1284 |
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
| 1285 |
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
| 1286 |
|
|
} else {
|
| 1287 |
|
|
ip->ip_sum = in_cksum(copym, hlen);
|
| 1288 |
|
|
}
|
| 1289 |
|
|
/*
|
| 1290 |
|
|
* NB:
|
| 1291 |
|
|
* It's not clear whether there are any lingering
|
| 1292 |
|
|
* reentrancy problems in other areas which might
|
| 1293 |
|
|
* be exposed by using ip_input directly (in
|
| 1294 |
|
|
* particular, everything which modifies the packet
|
| 1295 |
|
|
* in-place). Yet another option is using the
|
| 1296 |
|
|
* protosw directly to deliver the looped back
|
| 1297 |
|
|
* packet. For the moment, we'll err on the side
|
| 1298 |
|
|
* of safety by continuing to abuse looutput().
|
| 1299 |
|
|
*/
|
| 1300 |
|
|
#ifdef notdef
|
| 1301 |
|
|
copym->m_pkthdr.rcvif = ifp;
|
| 1302 |
|
|
ip_input(copym)
|
| 1303 |
|
|
#else
|
| 1304 |
|
|
(void) looutput(ifp, copym, (struct sockaddr *)dst, NULL);
|
| 1305 |
|
|
#endif
|
| 1306 |
|
|
}
|
| 1307 |
|
|
}
|
