cfe8b629f1
another specialized mbuf type in the process. Also clean up some of the cruft surrounding IPFW, multicast routing, RSVP, and other ill-explored corners.
1494 lines
37 KiB
C
1494 lines
37 KiB
C
/*
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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 1.80 1998/08/01 08:44:33 peter Exp $
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*/
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#define _IP_VHL
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#include "opt_ipfw.h"
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#include "opt_ipdivert.h"
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#include "opt_ipfilter.h"
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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/mbuf.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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static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
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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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#ifdef COMPAT_IPFW
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#include <netinet/ip_fw.h>
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#endif
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#ifdef IPFIREWALL_FORWARD_DEBUG
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#define print_ip(a) printf("%ld.%ld.%ld.%ld",(ntohl(a.s_addr)>>24)&0xFF,\
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(ntohl(a.s_addr)>>16)&0xFF,\
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(ntohl(a.s_addr)>>8)&0xFF,\
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(ntohl(a.s_addr))&0xFF);
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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((struct sockopt *, struct ip_moptions *));
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static int ip_pcbopts __P((int, struct mbuf **, struct mbuf *));
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static int ip_setmoptions
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__P((struct sockopt *, struct ip_moptions **));
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#if defined(IPFILTER_LKM) || defined(IPFILTER)
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int ip_optcopy __P((struct ip *, struct ip *));
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extern int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **));
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#else
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static int ip_optcopy __P((struct ip *, struct ip *));
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#endif
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|
|
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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 IPFIREWALL_FORWARD
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int fwd_rewrite_src = 0;
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#endif
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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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}
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if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
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struct in_multi *inm;
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m->m_flags |= M_MCAST;
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/*
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* IP destination address is multicast. Make sure "dst"
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* still points to the address in "ro". (It may have been
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* changed to point to a gateway address, above.)
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*/
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dst = (struct sockaddr_in *)&ro->ro_dst;
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/*
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* See if the caller provided any multicast options
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*/
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if (imo != NULL) {
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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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ifp = imo->imo_multicast_ifp;
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if (imo->imo_multicast_vif != -1)
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ip->ip_src.s_addr =
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ip_mcast_src(imo->imo_multicast_vif);
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} else
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ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
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/*
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* Confirm that the outgoing interface supports multicast.
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*/
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if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
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if ((ifp->if_flags & IFF_MULTICAST) == 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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}
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/*
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* If source address not specified yet, use address
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* of outgoing interface.
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*/
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if (ip->ip_src.s_addr == INADDR_ANY) {
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register struct in_ifaddr *ia1;
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for (ia1 = in_ifaddrhead.tqh_first; ia1;
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ia1 = ia1->ia_link.tqe_next)
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if (ia1->ia_ifp == ifp) {
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ip->ip_src = IA_SIN(ia1)->sin_addr;
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break;
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}
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}
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IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
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if (inm != NULL &&
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(imo == NULL || imo->imo_multicast_loop)) {
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/*
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* If we belong to the destination multicast group
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* on the outgoing interface, and the caller did not
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* forbid loopback, loop back a copy.
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*/
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ip_mloopback(ifp, m, dst, hlen);
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}
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else {
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/*
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* If we are acting as a multicast router, perform
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* multicast forwarding as if the packet had just
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* arrived on the interface to which we are about
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* to send. The multicast forwarding function
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* recursively calls this function, using the
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* IP_FORWARDING flag to prevent infinite recursion.
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*
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* Multicasts that are looped back by ip_mloopback(),
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* above, will be forwarded by the ip_input() routine,
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* if necessary.
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*/
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if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
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/*
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* Check if rsvp daemon is running. If not, don't
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* set ip_moptions. This ensures that the packet
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* is multicast and not just sent down one link
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* as prescribed by rsvpd.
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|
*/
|
|
if (!rsvp_on)
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imo = NULL;
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if (ip_mforward(ip, ifp, m, imo) != 0) {
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|
m_freem(m);
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|
goto done;
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|
}
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|
}
|
|
}
|
|
|
|
/*
|
|
* Multicasts with a time-to-live of zero may be looped-
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* back, above, but must not be transmitted on a network.
|
|
* Also, multicasts addressed to the loopback interface
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* are not sent -- the above call to ip_mloopback() will
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* loop back a copy if this host actually belongs to the
|
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* destination group on the loopback interface.
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*/
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if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
|
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m_freem(m);
|
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goto done;
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|
}
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|
|
|
goto sendit;
|
|
}
|
|
#ifndef notdef
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|
/*
|
|
* If source address not specified yet, use address
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* of outgoing interface.
|
|
*/
|
|
if (ip->ip_src.s_addr == INADDR_ANY) {
|
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ip->ip_src = IA_SIN(ia)->sin_addr;
|
|
#ifdef IPFIREWALL_FORWARD
|
|
/* Keep note that we did this - if the firewall changes
|
|
* the next-hop, our interface may change, changing the
|
|
* default source IP. It's a shame so much effort happens
|
|
* twice. Oh well.
|
|
*/
|
|
fwd_rewrite_src++;
|
|
#endif /* IPFIREWALL_FORWARD */
|
|
}
|
|
#endif /* notdef */
|
|
/*
|
|
* Verify that we have any chance at all of being able to queue
|
|
* the packet or packet fragments
|
|
*/
|
|
if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
|
|
ifp->if_snd.ifq_maxlen) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Look for broadcast address and
|
|
* and verify user is allowed to send
|
|
* such a packet.
|
|
*/
|
|
if (isbroadcast) {
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
if ((flags & IP_ALLOWBROADCAST) == 0) {
|
|
error = EACCES;
|
|
goto bad;
|
|
}
|
|
/* don't allow broadcast messages to be fragmented */
|
|
if ((u_short)ip->ip_len > ifp->if_mtu) {
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
m->m_flags |= M_BCAST;
|
|
} else {
|
|
m->m_flags &= ~M_BCAST;
|
|
}
|
|
|
|
sendit:
|
|
/*
|
|
* IpHack's section.
|
|
* - Xlate: translate packet's addr/port (NAT).
|
|
* - Firewall: deny/allow/etc.
|
|
* - Wrap: fake packet's addr/port <unimpl.>
|
|
* - Encapsulate: put it in another IP and send out. <unimp.>
|
|
*/
|
|
#if defined(IPFILTER) || defined(IPFILTER_LKM)
|
|
if (fr_checkp) {
|
|
struct mbuf *m1 = m;
|
|
|
|
if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1)
|
|
goto done;
|
|
ip = mtod(m = m1, struct ip *);
|
|
}
|
|
#endif
|
|
|
|
#ifdef COMPAT_IPFW
|
|
if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) {
|
|
error = EACCES;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Check with the firewall...
|
|
*/
|
|
if (ip_fw_chk_ptr) {
|
|
#ifdef IPFIREWALL_FORWARD
|
|
struct sockaddr_in *old = dst;
|
|
#endif
|
|
#ifdef IPDIVERT
|
|
ip_divert_port = (*ip_fw_chk_ptr)(&ip,
|
|
hlen, ifp, &ip_divert_cookie, &m, &dst);
|
|
if (ip_divert_port) { /* Divert packet */
|
|
(*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, 0);
|
|
goto done;
|
|
}
|
|
#else /* !IPDIVERT */
|
|
u_int16_t dummy = 0;
|
|
/* If ipfw says divert, we have to just drop packet */
|
|
if ((*ip_fw_chk_ptr)(&ip, hlen, ifp, &dummy, &m, &dst)) {
|
|
m_freem(m);
|
|
goto done;
|
|
}
|
|
#endif /* !IPDIVERT */
|
|
if (!m) {
|
|
error = EACCES;
|
|
goto done;
|
|
}
|
|
#ifdef IPFIREWALL_FORWARD
|
|
/* Here we check dst to make sure it's directly reachable on the
|
|
* interface we previously thought it was.
|
|
* If it isn't (which may be likely in some situations) we have
|
|
* to re-route it (ie, find a route for the next-hop and the
|
|
* associated interface) and set them here. This is nested
|
|
* forwarding which in most cases is undesirable, except where
|
|
* such control is nigh impossible. So we do it here.
|
|
* And I'm babbling.
|
|
*/
|
|
if (old != dst) {
|
|
struct in_ifaddr *ia;
|
|
|
|
/* It's changed... */
|
|
/* There must be a better way to do this next line... */
|
|
static struct route sro_fwd, *ro_fwd = &sro_fwd;
|
|
#ifdef IPFIREWALL_FORWARD_DEBUG
|
|
printf("IPFIREWALL_FORWARD: New dst ip: ");
|
|
print_ip(dst->sin_addr);
|
|
printf("\n");
|
|
#endif
|
|
/*
|
|
* We need to figure out if we have been forwarded
|
|
* to a local socket. If so then we should somehow
|
|
* "loop back" to ip_input, and get directed to the
|
|
* PCB as if we had received this packet. This is
|
|
* because it may be dificult to identify the packets
|
|
* you want to forward until they are being output
|
|
* and have selected an interface. (e.g. locally
|
|
* initiated packets) If we used the loopback inteface,
|
|
* we would not be able to control what happens
|
|
* as the packet runs through ip_input() as
|
|
* it is done through a ISR.
|
|
*/
|
|
for (ia = TAILQ_FIRST(&in_ifaddrhead); ia;
|
|
ia = TAILQ_NEXT(ia, ia_link)) {
|
|
/*
|
|
* If the addr to forward to is one
|
|
* of ours, we pretend to
|
|
* be the destination for this packet.
|
|
*/
|
|
if (IA_SIN(ia)->sin_addr.s_addr ==
|
|
dst->sin_addr.s_addr)
|
|
break;
|
|
}
|
|
if (ia) {
|
|
/* tell ip_input "dont filter" */
|
|
ip_fw_fwd_addr = dst;
|
|
if (m->m_pkthdr.rcvif == NULL)
|
|
m->m_pkthdr.rcvif = ifunit("lo0");
|
|
ip->ip_len = htons((u_short)ip->ip_len);
|
|
ip->ip_off = htons((u_short)ip->ip_off);
|
|
ip->ip_sum = 0;
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
|
} else {
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
}
|
|
ip_input(m);
|
|
goto done;
|
|
}
|
|
/* Some of the logic for this was
|
|
* nicked from above.
|
|
*
|
|
* This rewrites the cached route in a local PCB.
|
|
* Is this what we want to do?
|
|
*/
|
|
bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
|
|
|
|
ro_fwd->ro_rt = 0;
|
|
rtalloc_ign(ro_fwd, RTF_PRCLONING);
|
|
|
|
if (ro_fwd->ro_rt == 0) {
|
|
ipstat.ips_noroute++;
|
|
error = EHOSTUNREACH;
|
|
goto bad;
|
|
}
|
|
|
|
ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
|
|
ifp = ro_fwd->ro_rt->rt_ifp;
|
|
ro_fwd->ro_rt->rt_use++;
|
|
if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
|
|
dst = (struct sockaddr_in *)ro_fwd->ro_rt->rt_gateway;
|
|
if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
|
|
isbroadcast =
|
|
(ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
|
|
else
|
|
isbroadcast = in_broadcast(dst->sin_addr, ifp);
|
|
RTFREE(ro->ro_rt);
|
|
ro->ro_rt = ro_fwd->ro_rt;
|
|
dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
|
|
|
|
/*
|
|
* If we added a default src ip earlier,
|
|
* which would have been gotten from the-then
|
|
* interface, do it again, from the new one.
|
|
*/
|
|
if (fwd_rewrite_src)
|
|
ip->ip_src = IA_SIN(ia)->sin_addr;
|
|
}
|
|
#endif /* IPFIREWALL_FORWARD */
|
|
}
|
|
#endif /* COMPAT_IPFW */
|
|
|
|
|
|
/*
|
|
* If small enough for interface, can just send directly.
|
|
*/
|
|
if ((u_short)ip->ip_len <= ifp->if_mtu) {
|
|
ip->ip_len = htons((u_short)ip->ip_len);
|
|
ip->ip_off = htons((u_short)ip->ip_off);
|
|
ip->ip_sum = 0;
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
|
} else {
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
}
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst, ro->ro_rt);
|
|
goto done;
|
|
}
|
|
/*
|
|
* Too large for interface; fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
if (ip->ip_off & IP_DF) {
|
|
error = EMSGSIZE;
|
|
/*
|
|
* This case can happen if the user changed the MTU
|
|
* of an interface after enabling IP on it. Because
|
|
* most netifs don't keep track of routes pointing to
|
|
* them, there is no way for one to update all its
|
|
* routes when the MTU is changed.
|
|
*/
|
|
if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
|
|
&& !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
|
|
&& (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
|
|
ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
|
|
}
|
|
ipstat.ips_cantfrag++;
|
|
goto bad;
|
|
}
|
|
len = (ifp->if_mtu - hlen) &~ 7;
|
|
if (len < 8) {
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
|
|
{
|
|
int mhlen, firstlen = len;
|
|
struct mbuf **mnext = &m->m_nextpkt;
|
|
|
|
/*
|
|
* Loop through length of segment after first fragment,
|
|
* make new header and copy data of each part and link onto chain.
|
|
*/
|
|
m0 = m;
|
|
mhlen = sizeof (struct ip);
|
|
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
ipstat.ips_odropped++;
|
|
goto sendorfree;
|
|
}
|
|
m->m_data += max_linkhdr;
|
|
mhip = mtod(m, struct ip *);
|
|
*mhip = *ip;
|
|
if (hlen > sizeof (struct ip)) {
|
|
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
|
mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
|
|
}
|
|
m->m_len = mhlen;
|
|
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
|
|
if (ip->ip_off & IP_MF)
|
|
mhip->ip_off |= IP_MF;
|
|
if (off + len >= (u_short)ip->ip_len)
|
|
len = (u_short)ip->ip_len - off;
|
|
else
|
|
mhip->ip_off |= IP_MF;
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
|
m->m_next = m_copy(m0, off, len);
|
|
if (m->m_next == 0) {
|
|
(void) m_free(m);
|
|
error = ENOBUFS; /* ??? */
|
|
ipstat.ips_odropped++;
|
|
goto sendorfree;
|
|
}
|
|
m->m_pkthdr.len = mhlen + len;
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
mhip->ip_off = htons((u_short)mhip->ip_off);
|
|
mhip->ip_sum = 0;
|
|
if (mhip->ip_vhl == IP_VHL_BORING) {
|
|
mhip->ip_sum = in_cksum_hdr(mhip);
|
|
} else {
|
|
mhip->ip_sum = in_cksum(m, mhlen);
|
|
}
|
|
*mnext = m;
|
|
mnext = &m->m_nextpkt;
|
|
ipstat.ips_ofragments++;
|
|
}
|
|
/*
|
|
* Update first fragment by trimming what's been copied out
|
|
* and updating header, then send each fragment (in order).
|
|
*/
|
|
m = m0;
|
|
m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
|
|
m->m_pkthdr.len = hlen + firstlen;
|
|
ip->ip_len = htons((u_short)m->m_pkthdr.len);
|
|
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
|
|
ip->ip_sum = 0;
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
|
} else {
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
}
|
|
sendorfree:
|
|
for (m = m0; m; m = m0) {
|
|
m0 = m->m_nextpkt;
|
|
m->m_nextpkt = 0;
|
|
if (error == 0)
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst, ro->ro_rt);
|
|
else
|
|
m_freem(m);
|
|
}
|
|
|
|
if (error == 0)
|
|
ipstat.ips_fragmented++;
|
|
}
|
|
done:
|
|
return (error);
|
|
bad:
|
|
m_freem(m0);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Insert IP options into preformed packet.
|
|
* Adjust IP destination as required for IP source routing,
|
|
* as indicated by a non-zero in_addr at the start of the options.
|
|
*
|
|
* XXX This routine assumes that the packet has no options in place.
|
|
*/
|
|
static struct mbuf *
|
|
ip_insertoptions(m, opt, phlen)
|
|
register struct mbuf *m;
|
|
struct mbuf *opt;
|
|
int *phlen;
|
|
{
|
|
register struct ipoption *p = mtod(opt, struct ipoption *);
|
|
struct mbuf *n;
|
|
register struct ip *ip = mtod(m, struct ip *);
|
|
unsigned optlen;
|
|
|
|
optlen = opt->m_len - sizeof(p->ipopt_dst);
|
|
if (optlen + (u_short)ip->ip_len > IP_MAXPACKET)
|
|
return (m); /* XXX should fail */
|
|
if (p->ipopt_dst.s_addr)
|
|
ip->ip_dst = p->ipopt_dst;
|
|
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
|
|
MGETHDR(n, M_DONTWAIT, MT_HEADER);
|
|
if (n == 0)
|
|
return (m);
|
|
n->m_pkthdr.len = m->m_pkthdr.len + optlen;
|
|
m->m_len -= sizeof(struct ip);
|
|
m->m_data += sizeof(struct ip);
|
|
n->m_next = m;
|
|
m = n;
|
|
m->m_len = optlen + sizeof(struct ip);
|
|
m->m_data += max_linkhdr;
|
|
(void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
|
|
} else {
|
|
m->m_data -= optlen;
|
|
m->m_len += optlen;
|
|
m->m_pkthdr.len += optlen;
|
|
ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
bcopy(p->ipopt_list, ip + 1, optlen);
|
|
*phlen = sizeof(struct ip) + optlen;
|
|
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
|
|
ip->ip_len += optlen;
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Copy options from ip to jp,
|
|
* omitting those not copied during fragmentation.
|
|
*/
|
|
#if !defined(IPFILTER) && !defined(IPFILTER_LKM)
|
|
static
|
|
#endif
|
|
int
|
|
ip_optcopy(ip, jp)
|
|
struct ip *ip, *jp;
|
|
{
|
|
register u_char *cp, *dp;
|
|
int opt, optlen, cnt;
|
|
|
|
cp = (u_char *)(ip + 1);
|
|
dp = (u_char *)(jp + 1);
|
|
cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
|
opt = cp[0];
|
|
if (opt == IPOPT_EOL)
|
|
break;
|
|
if (opt == IPOPT_NOP) {
|
|
/* Preserve for IP mcast tunnel's LSRR alignment. */
|
|
*dp++ = IPOPT_NOP;
|
|
optlen = 1;
|
|
continue;
|
|
} else
|
|
optlen = cp[IPOPT_OLEN];
|
|
/* bogus lengths should have been caught by ip_dooptions */
|
|
if (optlen > cnt)
|
|
optlen = cnt;
|
|
if (IPOPT_COPIED(opt)) {
|
|
bcopy(cp, dp, optlen);
|
|
dp += optlen;
|
|
}
|
|
}
|
|
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
|
|
*dp++ = IPOPT_EOL;
|
|
return (optlen);
|
|
}
|
|
|
|
/*
|
|
* IP socket option processing.
|
|
*/
|
|
int
|
|
ip_ctloutput(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
int error, optval;
|
|
|
|
error = optval = 0;
|
|
if (sopt->sopt_level != IPPROTO_IP) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
case IP_OPTIONS:
|
|
#ifdef notyet
|
|
case IP_RETOPTS:
|
|
#endif
|
|
{
|
|
struct mbuf *m;
|
|
if (sopt->sopt_valsize > MLEN) {
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
m->m_len = sopt->sopt_valsize;
|
|
error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
|
|
m->m_len);
|
|
|
|
return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
|
|
m));
|
|
}
|
|
|
|
case IP_TOS:
|
|
case IP_TTL:
|
|
case IP_RECVOPTS:
|
|
case IP_RECVRETOPTS:
|
|
case IP_RECVDSTADDR:
|
|
case IP_RECVIF:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
switch (sopt->sopt_name) {
|
|
case IP_TOS:
|
|
inp->inp_ip_tos = optval;
|
|
break;
|
|
|
|
case IP_TTL:
|
|
inp->inp_ip_ttl = optval;
|
|
break;
|
|
#define OPTSET(bit) \
|
|
if (optval) \
|
|
inp->inp_flags |= bit; \
|
|
else \
|
|
inp->inp_flags &= ~bit;
|
|
|
|
case IP_RECVOPTS:
|
|
OPTSET(INP_RECVOPTS);
|
|
break;
|
|
|
|
case IP_RECVRETOPTS:
|
|
OPTSET(INP_RECVRETOPTS);
|
|
break;
|
|
|
|
case IP_RECVDSTADDR:
|
|
OPTSET(INP_RECVDSTADDR);
|
|
break;
|
|
|
|
case IP_RECVIF:
|
|
OPTSET(INP_RECVIF);
|
|
break;
|
|
}
|
|
break;
|
|
#undef OPTSET
|
|
|
|
case IP_MULTICAST_IF:
|
|
case IP_MULTICAST_VIF:
|
|
case IP_MULTICAST_TTL:
|
|
case IP_MULTICAST_LOOP:
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_DROP_MEMBERSHIP:
|
|
error = ip_setmoptions(sopt, &inp->inp_moptions);
|
|
break;
|
|
|
|
case IP_PORTRANGE:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
switch (optval) {
|
|
case IP_PORTRANGE_DEFAULT:
|
|
inp->inp_flags &= ~(INP_LOWPORT);
|
|
inp->inp_flags &= ~(INP_HIGHPORT);
|
|
break;
|
|
|
|
case IP_PORTRANGE_HIGH:
|
|
inp->inp_flags &= ~(INP_LOWPORT);
|
|
inp->inp_flags |= INP_HIGHPORT;
|
|
break;
|
|
|
|
case IP_PORTRANGE_LOW:
|
|
inp->inp_flags &= ~(INP_HIGHPORT);
|
|
inp->inp_flags |= INP_LOWPORT;
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case IP_OPTIONS:
|
|
case IP_RETOPTS:
|
|
if (inp->inp_options)
|
|
error = sooptcopyout(sopt,
|
|
mtod(inp->inp_options,
|
|
char *),
|
|
inp->inp_options->m_len);
|
|
else
|
|
sopt->sopt_valsize = 0;
|
|
break;
|
|
|
|
case IP_TOS:
|
|
case IP_TTL:
|
|
case IP_RECVOPTS:
|
|
case IP_RECVRETOPTS:
|
|
case IP_RECVDSTADDR:
|
|
case IP_RECVIF:
|
|
case IP_PORTRANGE:
|
|
switch (sopt->sopt_name) {
|
|
|
|
case IP_TOS:
|
|
optval = inp->inp_ip_tos;
|
|
break;
|
|
|
|
case IP_TTL:
|
|
optval = inp->inp_ip_ttl;
|
|
break;
|
|
|
|
#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
|
|
|
|
case IP_RECVOPTS:
|
|
optval = OPTBIT(INP_RECVOPTS);
|
|
break;
|
|
|
|
case IP_RECVRETOPTS:
|
|
optval = OPTBIT(INP_RECVRETOPTS);
|
|
break;
|
|
|
|
case IP_RECVDSTADDR:
|
|
optval = OPTBIT(INP_RECVDSTADDR);
|
|
break;
|
|
|
|
case IP_RECVIF:
|
|
optval = OPTBIT(INP_RECVIF);
|
|
break;
|
|
|
|
case IP_PORTRANGE:
|
|
if (inp->inp_flags & INP_HIGHPORT)
|
|
optval = IP_PORTRANGE_HIGH;
|
|
else if (inp->inp_flags & INP_LOWPORT)
|
|
optval = IP_PORTRANGE_LOW;
|
|
else
|
|
optval = 0;
|
|
break;
|
|
}
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
|
|
case IP_MULTICAST_IF:
|
|
case IP_MULTICAST_VIF:
|
|
case IP_MULTICAST_TTL:
|
|
case IP_MULTICAST_LOOP:
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_DROP_MEMBERSHIP:
|
|
error = ip_getmoptions(sopt, inp->inp_moptions);
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Set up IP options in pcb for insertion in output packets.
|
|
* Store in mbuf with pointer in pcbopt, adding pseudo-option
|
|
* with destination address if source routed.
|
|
*/
|
|
static int
|
|
ip_pcbopts(optname, pcbopt, m)
|
|
int optname;
|
|
struct mbuf **pcbopt;
|
|
register struct mbuf *m;
|
|
{
|
|
register int cnt, optlen;
|
|
register u_char *cp;
|
|
u_char opt;
|
|
|
|
/* turn off any old options */
|
|
if (*pcbopt)
|
|
(void)m_free(*pcbopt);
|
|
*pcbopt = 0;
|
|
if (m == (struct mbuf *)0 || m->m_len == 0) {
|
|
/*
|
|
* Only turning off any previous options.
|
|
*/
|
|
if (m)
|
|
(void)m_free(m);
|
|
return (0);
|
|
}
|
|
|
|
#ifndef vax
|
|
if (m->m_len % sizeof(int32_t))
|
|
goto bad;
|
|
#endif
|
|
/*
|
|
* IP first-hop destination address will be stored before
|
|
* actual options; move other options back
|
|
* and clear it when none present.
|
|
*/
|
|
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
|
|
goto bad;
|
|
cnt = m->m_len;
|
|
m->m_len += sizeof(struct in_addr);
|
|
cp = mtod(m, u_char *) + sizeof(struct in_addr);
|
|
ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
|
|
bzero(mtod(m, caddr_t), sizeof(struct in_addr));
|
|
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
|
opt = cp[IPOPT_OPTVAL];
|
|
if (opt == IPOPT_EOL)
|
|
break;
|
|
if (opt == IPOPT_NOP)
|
|
optlen = 1;
|
|
else {
|
|
optlen = cp[IPOPT_OLEN];
|
|
if (optlen <= IPOPT_OLEN || optlen > cnt)
|
|
goto bad;
|
|
}
|
|
switch (opt) {
|
|
|
|
default:
|
|
break;
|
|
|
|
case IPOPT_LSRR:
|
|
case IPOPT_SSRR:
|
|
/*
|
|
* user process specifies route as:
|
|
* ->A->B->C->D
|
|
* D must be our final destination (but we can't
|
|
* check that since we may not have connected yet).
|
|
* A is first hop destination, which doesn't appear in
|
|
* actual IP option, but is stored before the options.
|
|
*/
|
|
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
|
|
goto bad;
|
|
m->m_len -= sizeof(struct in_addr);
|
|
cnt -= sizeof(struct in_addr);
|
|
optlen -= sizeof(struct in_addr);
|
|
cp[IPOPT_OLEN] = optlen;
|
|
/*
|
|
* Move first hop before start of options.
|
|
*/
|
|
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
|
|
sizeof(struct in_addr));
|
|
/*
|
|
* Then copy rest of options back
|
|
* to close up the deleted entry.
|
|
*/
|
|
ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
|
|
sizeof(struct in_addr)),
|
|
(caddr_t)&cp[IPOPT_OFFSET+1],
|
|
(unsigned)cnt + sizeof(struct in_addr));
|
|
break;
|
|
}
|
|
}
|
|
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
|
|
goto bad;
|
|
*pcbopt = m;
|
|
return (0);
|
|
|
|
bad:
|
|
(void)m_free(m);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* XXX
|
|
* The whole multicast option thing needs to be re-thought.
|
|
* Several of these options are equally applicable to non-multicast
|
|
* transmission, and one (IP_MULTICAST_TTL) totally duplicates a
|
|
* standard option (IP_TTL).
|
|
*/
|
|
/*
|
|
* Set the IP multicast options in response to user setsockopt().
|
|
*/
|
|
static int
|
|
ip_setmoptions(sopt, imop)
|
|
struct sockopt *sopt;
|
|
struct ip_moptions **imop;
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
struct in_addr addr;
|
|
struct ip_mreq mreq;
|
|
struct ifnet *ifp;
|
|
struct ip_moptions *imo = *imop;
|
|
struct route ro;
|
|
struct sockaddr_in *dst;
|
|
int s;
|
|
|
|
if (imo == NULL) {
|
|
/*
|
|
* No multicast option buffer attached to the pcb;
|
|
* allocate one and initialize to default values.
|
|
*/
|
|
imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS,
|
|
M_WAITOK);
|
|
|
|
if (imo == NULL)
|
|
return (ENOBUFS);
|
|
*imop = imo;
|
|
imo->imo_multicast_ifp = NULL;
|
|
imo->imo_multicast_vif = -1;
|
|
imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
|
|
imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
|
|
imo->imo_num_memberships = 0;
|
|
}
|
|
|
|
switch (sopt->sopt_name) {
|
|
/* store an index number for the vif you wanna use in the send */
|
|
case IP_MULTICAST_VIF:
|
|
if (legal_vif_num == 0) {
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
|
|
if (error)
|
|
break;
|
|
if (!legal_vif_num(i) && (i != -1)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
imo->imo_multicast_vif = i;
|
|
break;
|
|
|
|
case IP_MULTICAST_IF:
|
|
/*
|
|
* Select the interface for outgoing multicast packets.
|
|
*/
|
|
error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
|
|
if (error)
|
|
break;
|
|
/*
|
|
* INADDR_ANY is used to remove a previous selection.
|
|
* When no interface is selected, a default one is
|
|
* chosen every time a multicast packet is sent.
|
|
*/
|
|
if (addr.s_addr == INADDR_ANY) {
|
|
imo->imo_multicast_ifp = NULL;
|
|
break;
|
|
}
|
|
/*
|
|
* The selected interface is identified by its local
|
|
* IP address. Find the interface and confirm that
|
|
* it supports multicasting.
|
|
*/
|
|
s = splimp();
|
|
INADDR_TO_IFP(addr, ifp);
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
splx(s);
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
imo->imo_multicast_ifp = ifp;
|
|
splx(s);
|
|
break;
|
|
|
|
case IP_MULTICAST_TTL:
|
|
/*
|
|
* Set the IP time-to-live for outgoing multicast packets.
|
|
* The original multicast API required a char argument,
|
|
* which is inconsistent with the rest of the socket API.
|
|
* We allow either a char or an int.
|
|
*/
|
|
if (sopt->sopt_valsize == 1) {
|
|
u_char ttl;
|
|
error = sooptcopyin(sopt, &ttl, 1, 1);
|
|
if (error)
|
|
break;
|
|
imo->imo_multicast_ttl = ttl;
|
|
} else {
|
|
u_int ttl;
|
|
error = sooptcopyin(sopt, &ttl, sizeof ttl,
|
|
sizeof ttl);
|
|
if (error)
|
|
break;
|
|
if (ttl > 255)
|
|
error = EINVAL;
|
|
else
|
|
imo->imo_multicast_ttl = ttl;
|
|
}
|
|
break;
|
|
|
|
case IP_MULTICAST_LOOP:
|
|
/*
|
|
* Set the loopback flag for outgoing multicast packets.
|
|
* Must be zero or one. The original multicast API required a
|
|
* char argument, which is inconsistent with the rest
|
|
* of the socket API. We allow either a char or an int.
|
|
*/
|
|
if (sopt->sopt_valsize == 1) {
|
|
u_char loop;
|
|
error = sooptcopyin(sopt, &loop, 1, 1);
|
|
if (error)
|
|
break;
|
|
imo->imo_multicast_loop = !!loop;
|
|
} else {
|
|
u_int loop;
|
|
error = sooptcopyin(sopt, &loop, sizeof loop,
|
|
sizeof loop);
|
|
if (error)
|
|
break;
|
|
imo->imo_multicast_loop = !!loop;
|
|
}
|
|
break;
|
|
|
|
case IP_ADD_MEMBERSHIP:
|
|
/*
|
|
* Add a multicast group membership.
|
|
* Group must be a valid IP multicast address.
|
|
*/
|
|
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
|
|
if (error)
|
|
break;
|
|
|
|
if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
s = splimp();
|
|
/*
|
|
* If no interface address was provided, use the interface of
|
|
* the route to the given multicast address.
|
|
*/
|
|
if (mreq.imr_interface.s_addr == INADDR_ANY) {
|
|
bzero((caddr_t)&ro, sizeof(ro));
|
|
dst = (struct sockaddr_in *)&ro.ro_dst;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_addr = mreq.imr_multiaddr;
|
|
rtalloc(&ro);
|
|
if (ro.ro_rt == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
splx(s);
|
|
break;
|
|
}
|
|
ifp = ro.ro_rt->rt_ifp;
|
|
rtfree(ro.ro_rt);
|
|
}
|
|
else {
|
|
INADDR_TO_IFP(mreq.imr_interface, ifp);
|
|
}
|
|
|
|
/*
|
|
* See if we found an interface, and confirm that it
|
|
* supports multicast.
|
|
*/
|
|
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
splx(s);
|
|
break;
|
|
}
|
|
/*
|
|
* See if the membership already exists or if all the
|
|
* membership slots are full.
|
|
*/
|
|
for (i = 0; i < imo->imo_num_memberships; ++i) {
|
|
if (imo->imo_membership[i]->inm_ifp == ifp &&
|
|
imo->imo_membership[i]->inm_addr.s_addr
|
|
== mreq.imr_multiaddr.s_addr)
|
|
break;
|
|
}
|
|
if (i < imo->imo_num_memberships) {
|
|
error = EADDRINUSE;
|
|
splx(s);
|
|
break;
|
|
}
|
|
if (i == IP_MAX_MEMBERSHIPS) {
|
|
error = ETOOMANYREFS;
|
|
splx(s);
|
|
break;
|
|
}
|
|
/*
|
|
* Everything looks good; add a new record to the multicast
|
|
* address list for the given interface.
|
|
*/
|
|
if ((imo->imo_membership[i] =
|
|
in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
|
|
error = ENOBUFS;
|
|
splx(s);
|
|
break;
|
|
}
|
|
++imo->imo_num_memberships;
|
|
splx(s);
|
|
break;
|
|
|
|
case IP_DROP_MEMBERSHIP:
|
|
/*
|
|
* Drop a multicast group membership.
|
|
* Group must be a valid IP multicast address.
|
|
*/
|
|
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
|
|
if (error)
|
|
break;
|
|
|
|
if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
s = splimp();
|
|
/*
|
|
* If an interface address was specified, get a pointer
|
|
* to its ifnet structure.
|
|
*/
|
|
if (mreq.imr_interface.s_addr == INADDR_ANY)
|
|
ifp = NULL;
|
|
else {
|
|
INADDR_TO_IFP(mreq.imr_interface, ifp);
|
|
if (ifp == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
splx(s);
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* Find the membership in the membership array.
|
|
*/
|
|
for (i = 0; i < imo->imo_num_memberships; ++i) {
|
|
if ((ifp == NULL ||
|
|
imo->imo_membership[i]->inm_ifp == ifp) &&
|
|
imo->imo_membership[i]->inm_addr.s_addr ==
|
|
mreq.imr_multiaddr.s_addr)
|
|
break;
|
|
}
|
|
if (i == imo->imo_num_memberships) {
|
|
error = EADDRNOTAVAIL;
|
|
splx(s);
|
|
break;
|
|
}
|
|
/*
|
|
* Give up the multicast address record to which the
|
|
* membership points.
|
|
*/
|
|
in_delmulti(imo->imo_membership[i]);
|
|
/*
|
|
* Remove the gap in the membership array.
|
|
*/
|
|
for (++i; i < imo->imo_num_memberships; ++i)
|
|
imo->imo_membership[i-1] = imo->imo_membership[i];
|
|
--imo->imo_num_memberships;
|
|
splx(s);
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If all options have default values, no need to keep the mbuf.
|
|
*/
|
|
if (imo->imo_multicast_ifp == NULL &&
|
|
imo->imo_multicast_vif == -1 &&
|
|
imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
|
|
imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
|
|
imo->imo_num_memberships == 0) {
|
|
free(*imop, M_IPMOPTS);
|
|
*imop = NULL;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return the IP multicast options in response to user getsockopt().
|
|
*/
|
|
static int
|
|
ip_getmoptions(sopt, imo)
|
|
struct sockopt *sopt;
|
|
register struct ip_moptions *imo;
|
|
{
|
|
struct in_addr addr;
|
|
struct in_ifaddr *ia;
|
|
int error, optval;
|
|
u_char coptval;
|
|
|
|
error = 0;
|
|
switch (sopt->sopt_name) {
|
|
case IP_MULTICAST_VIF:
|
|
if (imo != NULL)
|
|
optval = imo->imo_multicast_vif;
|
|
else
|
|
optval = -1;
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
|
|
case IP_MULTICAST_IF:
|
|
if (imo == NULL || imo->imo_multicast_ifp == NULL)
|
|
addr.s_addr = INADDR_ANY;
|
|
else {
|
|
IFP_TO_IA(imo->imo_multicast_ifp, ia);
|
|
addr.s_addr = (ia == NULL) ? INADDR_ANY
|
|
: IA_SIN(ia)->sin_addr.s_addr;
|
|
}
|
|
error = sooptcopyout(sopt, &addr, sizeof addr);
|
|
break;
|
|
|
|
case IP_MULTICAST_TTL:
|
|
if (imo == 0)
|
|
optval = coptval = IP_DEFAULT_MULTICAST_TTL;
|
|
else
|
|
optval = coptval = imo->imo_multicast_ttl;
|
|
if (sopt->sopt_valsize == 1)
|
|
error = sooptcopyout(sopt, &coptval, 1);
|
|
else
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
|
|
case IP_MULTICAST_LOOP:
|
|
if (imo == 0)
|
|
optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
|
|
else
|
|
optval = coptval = imo->imo_multicast_loop;
|
|
if (sopt->sopt_valsize == 1)
|
|
error = sooptcopyout(sopt, &coptval, 1);
|
|
else
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Discard the IP multicast options.
|
|
*/
|
|
void
|
|
ip_freemoptions(imo)
|
|
register struct ip_moptions *imo;
|
|
{
|
|
register int i;
|
|
|
|
if (imo != NULL) {
|
|
for (i = 0; i < imo->imo_num_memberships; ++i)
|
|
in_delmulti(imo->imo_membership[i]);
|
|
free(imo, M_IPMOPTS);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Routine called from ip_output() to loop back a copy of an IP multicast
|
|
* packet to the input queue of a specified interface. Note that this
|
|
* calls the output routine of the loopback "driver", but with an interface
|
|
* pointer that might NOT be a loopback interface -- evil, but easier than
|
|
* replicating that code here.
|
|
*/
|
|
static void
|
|
ip_mloopback(ifp, m, dst, hlen)
|
|
struct ifnet *ifp;
|
|
register struct mbuf *m;
|
|
register struct sockaddr_in *dst;
|
|
int hlen;
|
|
{
|
|
register struct ip *ip;
|
|
struct mbuf *copym;
|
|
|
|
copym = m_copy(m, 0, M_COPYALL);
|
|
if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
|
|
copym = m_pullup(copym, hlen);
|
|
if (copym != NULL) {
|
|
/*
|
|
* We don't bother to fragment if the IP length is greater
|
|
* than the interface's MTU. Can this possibly matter?
|
|
*/
|
|
ip = mtod(copym, struct ip *);
|
|
ip->ip_len = htons((u_short)ip->ip_len);
|
|
ip->ip_off = htons((u_short)ip->ip_off);
|
|
ip->ip_sum = 0;
|
|
if (ip->ip_vhl == IP_VHL_BORING) {
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
|
} else {
|
|
ip->ip_sum = in_cksum(copym, hlen);
|
|
}
|
|
/*
|
|
* NB:
|
|
* It's not clear whether there are any lingering
|
|
* reentrancy problems in other areas which might
|
|
* be exposed by using ip_input directly (in
|
|
* particular, everything which modifies the packet
|
|
* in-place). Yet another option is using the
|
|
* protosw directly to deliver the looped back
|
|
* packet. For the moment, we'll err on the side
|
|
* of safety by using if_simloop().
|
|
*/
|
|
#if 1 /* XXX */
|
|
if (dst->sin_family != AF_INET) {
|
|
printf("ip_mloopback: bad address family %d\n",
|
|
dst->sin_family);
|
|
dst->sin_family = AF_INET;
|
|
}
|
|
#endif
|
|
|
|
#ifdef notdef
|
|
copym->m_pkthdr.rcvif = ifp;
|
|
ip_input(copym);
|
|
#else
|
|
if_simloop(ifp, copym, (struct sockaddr *)dst, 0);
|
|
#endif
|
|
}
|
|
}
|