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source: rtems/cpukit/libnetworking/netinet/ip_output.c @ b25b88e7

4.104.115

Last change on this file since b25b88e7 was b25b88e7, checked in by Ralf Corsepius <ralf.corsepius@…>, on 03/28/10 at 05:50:29
Add HAVE_CONFIG_H support to let files receive configure defines.
Property mode set to `100644`
File size: 31.7 KB

Rev	Line
[39e6e65a]	1	/*
	2	* Copyright (c) 1982, 1986, 1988, 1990, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*
	29	* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
[0c67b436]	30	* $FreeBSD: src/sys/netinet/ip_output.c,v 1.271 2007/03/23 09:43:36 bms Exp $
	31	*/
	32
	33	/*
[39e6e65a]	34	* $Id$
	35	*/
	36
[b25b88e7]	37	#ifdef HAVE_CONFIG_H
	38	#include "config.h"
	39	#endif
	40
[39e6e65a]	41	#define _IP_VHL
	42
	43	#include <sys/param.h>
[c301570]	44	#include <rtems/bsd/sys/queue.h>
[39e6e65a]	45	#include <sys/systm.h>
	46	#include <sys/malloc.h>
	47	#include <sys/mbuf.h>
[b3f8c9e1]	48	#include <errno.h>
[39e6e65a]	49	#include <sys/protosw.h>
	50	#include <sys/socket.h>
	51	#include <sys/socketvar.h>
	52
	53	#include <net/if.h>
	54	#include <net/route.h>
	55
	56	#include <netinet/in.h>
	57	#include <netinet/in_systm.h>
	58	#include <netinet/ip.h>
	59	#include <netinet/in_pcb.h>
	60	#include <netinet/in_var.h>
	61	#include <netinet/ip_var.h>
	62
	63	#include <machine/in_cksum.h>
	64
	65	#if !defined(COMPAT_IPFW) \|\| COMPAT_IPFW == 1
	66	#undef COMPAT_IPFW
	67	#define COMPAT_IPFW 1
	68	#else
	69	#undef COMPAT_IPFW
	70	#endif
	71
	72	u_short ip_id;
	73
[e5d6315e]	74	static struct mbuf ip_insertoptions(struct mbuf , struct mbuf , int );
[39e6e65a]	75	static void ip_mloopback
[e5d6315e]	76	(struct ifnet , struct mbuf , struct sockaddr_in *, int);
[39e6e65a]	77	static int ip_getmoptions
[e5d6315e]	78	(int, struct ip_moptions , struct mbuf *);
	79	static int ip_optcopy(struct ip , struct ip );
	80	static int ip_pcbopts(struct mbuf *, struct mbuf );
[39e6e65a]	81	static int ip_setmoptions
[e5d6315e]	82	(int, struct ip_moptions *, struct mbuf );
[39e6e65a]	83
	84	extern struct protosw inetsw[];
	85
	86	/*
	87	* IP output. The packet in mbuf chain m contains a skeletal IP
	88	* header (with len, off, ttl, proto, tos, src, dst).
	89	* The mbuf chain containing the packet will be freed.
	90	* The mbuf opt, if present, will not be freed.
	91	*/
	92	int
[dd967330]	93	ip_output(struct mbuf m0, struct mbuf opt, struct route *ro, int flags,
	94	struct ip_moptions *imo)
[39e6e65a]	95	{
	96	struct ip ip, mhip;
	97	struct ifnet *ifp;
	98	struct mbuf *m = m0;
	99	int hlen = sizeof (struct ip);
[3274c876]	100	int len = 0, off, error = 0;
[39e6e65a]	101	struct sockaddr_in *dst;
	102	struct in_ifaddr *ia;
	103	int isbroadcast;
	104
	105	#ifdef DIAGNOSTIC
	106	if ((m->m_flags & M_PKTHDR) == 0)
	107	panic("ip_output no HDR");
	108	if (!ro)
	109	panic("ip_output no route, proto = %d",
	110	mtod(m, struct ip *)->ip_p);
	111	#endif
	112	if (opt) {
	113	m = ip_insertoptions(m, opt, &len);
	114	hlen = len;
	115	}
	116	ip = mtod(m, struct ip *);
	117	/*
	118	* Fill in IP header.
	119	*/
	120	if ((flags & (IP_FORWARDING\|IP_RAWOUTPUT)) == 0) {
[f94e799e]	121	#ifdef _IP_VHL
[39e6e65a]	122	ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
[f94e799e]	123	#else
	124	ip->ip_v = IPVERSION;
	125	ip->ip_hl = hlen >> 2;
	126	#endif
[39e6e65a]	127	ip->ip_off &= IP_DF;
	128	ip->ip_id = htons(ip_id++);
	129	ipstat.ips_localout++;
	130	} else {
[491f63a]	131	#ifdef _IP_VHL
[39e6e65a]	132	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
[491f63a]	133	#else
	134	hlen = ip->ip_hl << 2;
	135	#endif
[39e6e65a]	136	}
	137
	138	dst = (struct sockaddr_in *)&ro->ro_dst;
	139	/*
	140	* If there is a cached route,
	141	* check that it is to the same destination
	142	* and is still up. If not, free it and try again.
	143	*/
	144	if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 \|\|
	145	dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
	146	RTFREE(ro->ro_rt);
	147	ro->ro_rt = (struct rtentry *)0;
	148	}
[0c67b436]	149	if (ro->ro_rt == NULL) {
[39e6e65a]	150	dst->sin_family = AF_INET;
	151	dst->sin_len = sizeof(*dst);
	152	dst->sin_addr = ip->ip_dst;
	153	}
	154	/*
	155	* If routing to interface only,
	156	* short circuit routing lookup.
	157	*/
	158	#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
	159	#define sintosa(sin) ((struct sockaddr *)(sin))
	160	if (flags & IP_ROUTETOIF) {
	161	if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
	162	(ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
	163	ipstat.ips_noroute++;
	164	error = ENETUNREACH;
	165	goto bad;
	166	}
	167	ifp = ia->ia_ifp;
	168	ip->ip_ttl = 1;
	169	isbroadcast = in_broadcast(dst->sin_addr, ifp);
	170	} else {
	171	/*
	172	* If this is the case, we probably don't want to allocate
	173	* a protocol-cloned route since we didn't get one from the
	174	* ULP. This lets TCP do its thing, while not burdening
	175	* forwarding or ICMP with the overhead of cloning a route.
	176	* Of course, we still want to do any cloning requested by
	177	* the link layer, as this is probably required in all cases
	178	* for correct operation (as it is for ARP).
	179	*/
	180	if (ro->ro_rt == 0)
	181	rtalloc_ign(ro, RTF_PRCLONING);
	182	if (ro->ro_rt == 0) {
	183	ipstat.ips_noroute++;
	184	error = EHOSTUNREACH;
	185	goto bad;
	186	}
	187	ia = ifatoia(ro->ro_rt->rt_ifa);
	188	ifp = ro->ro_rt->rt_ifp;
	189	ro->ro_rt->rt_use++;
	190	if (ro->ro_rt->rt_flags & RTF_GATEWAY)
	191	dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
	192	if (ro->ro_rt->rt_flags & RTF_HOST)
	193	isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
	194	else
	195	isbroadcast = in_broadcast(dst->sin_addr, ifp);
	196	}
	197	if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
	198	struct in_multi *inm;
	199
	200	m->m_flags \|= M_MCAST;
	201	/*
	202	* IP destination address is multicast. Make sure "dst"
	203	* still points to the address in "ro". (It may have been
	204	* changed to point to a gateway address, above.)
	205	*/
	206	dst = (struct sockaddr_in *)&ro->ro_dst;
	207	/*
	208	* See if the caller provided any multicast options
	209	*/
	210	if (imo != NULL) {
	211	ip->ip_ttl = imo->imo_multicast_ttl;
	212	if (imo->imo_multicast_ifp != NULL)
	213	ifp = imo->imo_multicast_ifp;
	214	if (imo->imo_multicast_vif != -1)
	215	ip->ip_src.s_addr =
	216	ip_mcast_src(imo->imo_multicast_vif);
	217	} else
	218	ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
	219	/*
	220	* Confirm that the outgoing interface supports multicast.
	221	*/
	222	if ((imo == NULL) \|\| (imo->imo_multicast_vif == -1)) {
	223	if ((ifp->if_flags & IFF_MULTICAST) == 0) {
	224	ipstat.ips_noroute++;
	225	error = ENETUNREACH;
	226	goto bad;
	227	}
	228	}
	229	/*
	230	* If source address not specified yet, use address
	231	* of outgoing interface.
	232	*/
	233	if (ip->ip_src.s_addr == INADDR_ANY) {
	234	register struct in_ifaddr *ia;
	235
	236	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	237	if (ia->ia_ifp == ifp) {
	238	ip->ip_src = IA_SIN(ia)->sin_addr;
	239	break;
	240	}
	241	}
	242
	243	IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
	244	if (inm != NULL &&
	245	(imo == NULL \|\| imo->imo_multicast_loop)) {
	246	/*
	247	* If we belong to the destination multicast group
	248	* on the outgoing interface, and the caller did not
	249	* forbid loopback, loop back a copy.
	250	*/
	251	ip_mloopback(ifp, m, dst, hlen);
	252	}
	253	else {
	254	/*
	255	* If we are acting as a multicast router, perform
	256	* multicast forwarding as if the packet had just
	257	* arrived on the interface to which we are about
	258	* to send. The multicast forwarding function
	259	* recursively calls this function, using the
	260	* IP_FORWARDING flag to prevent infinite recursion.
	261	*
	262	* Multicasts that are looped back by ip_mloopback(),
	263	* above, will be forwarded by the ip_input() routine,
	264	* if necessary.
	265	*/
	266	if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
	267	/*
	268	* Check if rsvp daemon is running. If not, don't
	269	* set ip_moptions. This ensures that the packet
	270	* is multicast and not just sent down one link
	271	* as prescribed by rsvpd.
	272	*/
	273	if (!rsvp_on)
	274	imo = NULL;
	275	if (ip_mforward(ip, ifp, m, imo) != 0) {
	276	m_freem(m);
	277	goto done;
	278	}
	279	}
	280	}
	281
	282	/*
	283	* Multicasts with a time-to-live of zero may be looped-
	284	* back, above, but must not be transmitted on a network.
	285	* Also, multicasts addressed to the loopback interface
	286	* are not sent -- the above call to ip_mloopback() will
	287	* loop back a copy if this host actually belongs to the
	288	* destination group on the loopback interface.
	289	*/
	290	if (ip->ip_ttl == 0 \|\| ifp->if_flags & IFF_LOOPBACK) {
	291	m_freem(m);
	292	goto done;
	293	}
	294
	295	goto sendit;
	296	}
	297	#ifndef notdef
	298	/*
	299	* If source address not specified yet, use address
	300	* of outgoing interface.
	301	*/
	302	if (ip->ip_src.s_addr == INADDR_ANY)
	303	ip->ip_src = IA_SIN(ia)->sin_addr;
	304	#endif
	305	/*
	306	* Verify that we have any chance at all of being able to queue
	307	* the packet or packet fragments
	308	*/
	309	if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
	310	ifp->if_snd.ifq_maxlen) {
	311	error = ENOBUFS;
	312	goto bad;
	313	}
	314
	315	/*
	316	* Look for broadcast address and
[0c67b436]	317	* verify user is allowed to send
[39e6e65a]	318	* such a packet.
	319	*/
	320	if (isbroadcast) {
	321	if ((ifp->if_flags & IFF_BROADCAST) == 0) {
	322	error = EADDRNOTAVAIL;
	323	goto bad;
	324	}
	325	if ((flags & IP_ALLOWBROADCAST) == 0) {
	326	error = EACCES;
	327	goto bad;
	328	}
	329	/* don't allow broadcast messages to be fragmented */
[f94e799e]	330	if (ip->ip_len > ifp->if_mtu) {
[39e6e65a]	331	error = EMSGSIZE;
	332	goto bad;
	333	}
	334	m->m_flags \|= M_BCAST;
	335	} else {
	336	m->m_flags &= ~M_BCAST;
	337	}
	338
	339	sendit:
	340	/*
	341	* IpHack's section.
	342	* - Xlate: translate packet's addr/port (NAT).
	343	* - Firewall: deny/allow/etc.
	344	* - Wrap: fake packet's addr/port <unimpl.>
	345	* - Encapsulate: put it in another IP and send out. <unimp.>
	346	*/
	347
	348	#ifdef COMPAT_IPFW
	349	if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) {
	350	error = EACCES;
	351	goto done;
	352	}
	353
	354	/*
	355	* Check with the firewall...
	356	*/
	357	if (ip_fw_chk_ptr) {
	358	#ifdef IPDIVERT
	359	ip_divert_port = (*ip_fw_chk_ptr)(&ip,
	360	hlen, ifp, ip_divert_ignore, &m);
	361	ip_divert_ignore = 0;
	362	if (ip_divert_port) { /* Divert packet */
	363	(*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, 0);
	364	goto done;
	365	}
	366	#else
	367	/* If ipfw says divert, we have to just drop packet */
	368	if ((*ip_fw_chk_ptr)(&ip, hlen, ifp, 0, &m)) {
	369	m_freem(m);
	370	goto done;
	371	}
	372	#endif
	373	if (!m) {
	374	error = EACCES;
	375	goto done;
	376	}
	377	}
	378	#endif /* COMPAT_IPFW */
	379
	380	/*
[0c67b436]	381	* If small enough for interface, or the interface will take
	382	* care of the fragmentation for us, we can just send directly.
[39e6e65a]	383	*/
	384	if ((u_short)ip->ip_len <= ifp->if_mtu) {
[0c67b436]	385	ip->ip_len = htons(ip->ip_len);
	386	ip->ip_off = htons(ip->ip_off);
[39e6e65a]	387	ip->ip_sum = 0;
[491f63a]	388	#ifdef _IP_VHL
[39e6e65a]	389	if (ip->ip_vhl == IP_VHL_BORING) {
[491f63a]	390	#else
	391	if ((ip->ip_hl == 5) && (ip->ip_v = IPVERSION)) {
	392	#endif
[39e6e65a]	393	ip->ip_sum = in_cksum_hdr(ip);
	394	} else {
	395	ip->ip_sum = in_cksum(m, hlen);
	396	}
	397	error = (*ifp->if_output)(ifp, m,
	398	(struct sockaddr *)dst, ro->ro_rt);
	399	goto done;
	400	}
	401	/*
	402	* Too large for interface; fragment if possible.
	403	* Must be able to put at least 8 bytes per fragment.
	404	*/
	405	if (ip->ip_off & IP_DF) {
	406	error = EMSGSIZE;
	407	/*
	408	* This case can happen if the user changed the MTU
	409	* of an interface after enabling IP on it. Because
	410	* most netifs don't keep track of routes pointing to
	411	* them, there is no way for one to update all its
	412	* routes when the MTU is changed.
	413	*/
	414	if ((ro->ro_rt->rt_flags & (RTF_UP \| RTF_HOST))
	415	&& !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
	416	&& (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
	417	ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
	418	}
	419	ipstat.ips_cantfrag++;
	420	goto bad;
	421	}
	422	len = (ifp->if_mtu - hlen) &~ 7;
	423	if (len < 8) {
	424	error = EMSGSIZE;
	425	goto bad;
	426	}
	427
	428	{
	429	int mhlen, firstlen = len;
	430	struct mbuf **mnext = &m->m_nextpkt;
	431
	432	/*
	433	* Loop through length of segment after first fragment,
	434	* make new header and copy data of each part and link onto chain.
	435	*/
	436	m0 = m;
	437	mhlen = sizeof (struct ip);
	438	for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
	439	MGETHDR(m, M_DONTWAIT, MT_HEADER);
	440	if (m == 0) {
	441	error = ENOBUFS;
	442	ipstat.ips_odropped++;
	443	goto sendorfree;
	444	}
[793249a]	445	m->m_flags \|= (m0->m_flags & M_MCAST);
[39e6e65a]	446	m->m_data += max_linkhdr;
	447	mhip = mtod(m, struct ip *);
	448	mhip = ip;
	449	if (hlen > sizeof (struct ip)) {
	450	mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
[491f63a]	451	#ifdef _IP_VHL
[39e6e65a]	452	mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
[491f63a]	453	#else
	454	mhip->ip_v = IPVERSION;
	455	mhip->ip_hl = mhlen >> 2;
	456	#endif
[39e6e65a]	457	}
	458	m->m_len = mhlen;
	459	mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
	460	if (ip->ip_off & IP_MF)
	461	mhip->ip_off \|= IP_MF;
	462	if (off + len >= (u_short)ip->ip_len)
	463	len = (u_short)ip->ip_len - off;
	464	else
	465	mhip->ip_off \|= IP_MF;
	466	mhip->ip_len = htons((u_short)(len + mhlen));
	467	m->m_next = m_copy(m0, off, len);
	468	if (m->m_next == 0) {
	469	(void) m_free(m);
	470	error = ENOBUFS; /* ??? */
	471	ipstat.ips_odropped++;
	472	goto sendorfree;
	473	}
	474	m->m_pkthdr.len = mhlen + len;
[0c67b436]	475	m->m_pkthdr.rcvif = NULL;
	476	mhip->ip_off = htons(mhip->ip_off);
[39e6e65a]	477	mhip->ip_sum = 0;
[491f63a]	478	#ifdef _IP_VHL
[39e6e65a]	479	if (mhip->ip_vhl == IP_VHL_BORING) {
[491f63a]	480	#else
	481	if ((mhip->ip_hl == 5) && (mhip->ip_v == IPVERSION) ) {
	482	#endif
[39e6e65a]	483	mhip->ip_sum = in_cksum_hdr(mhip);
	484	} else {
	485	mhip->ip_sum = in_cksum(m, mhlen);
	486	}
	487	*mnext = m;
	488	mnext = &m->m_nextpkt;
	489	ipstat.ips_ofragments++;
	490	}
	491	/*
	492	* Update first fragment by trimming what's been copied out
	493	* and updating header, then send each fragment (in order).
	494	*/
	495	m = m0;
	496	m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
	497	m->m_pkthdr.len = hlen + firstlen;
	498	ip->ip_len = htons((u_short)m->m_pkthdr.len);
[0c67b436]	499	ip->ip_off \|= IP_MF;
	500	ip->ip_off = htons(ip->ip_off);
[39e6e65a]	501	ip->ip_sum = 0;
[491f63a]	502	#ifdef _IP_VHL
[39e6e65a]	503	if (ip->ip_vhl == IP_VHL_BORING) {
[491f63a]	504	#else
	505	if ((ip->ip_hl == 5) && (ip->ip_v == IPVERSION) ) {
	506	#endif
[39e6e65a]	507	ip->ip_sum = in_cksum_hdr(ip);
	508	} else {
	509	ip->ip_sum = in_cksum(m, hlen);
	510	}
	511	sendorfree:
	512	for (m = m0; m; m = m0) {
	513	m0 = m->m_nextpkt;
	514	m->m_nextpkt = 0;
	515	if (error == 0)
	516	error = (*ifp->if_output)(ifp, m,
	517	(struct sockaddr *)dst, ro->ro_rt);
	518	else
	519	m_freem(m);
	520	}
	521
	522	if (error == 0)
	523	ipstat.ips_fragmented++;
	524	}
	525	done:
	526	return (error);
	527	bad:
	528	m_freem(m0);
	529	goto done;
	530	}
	531
	532	/*
	533	* Insert IP options into preformed packet.
	534	* Adjust IP destination as required for IP source routing,
	535	* as indicated by a non-zero in_addr at the start of the options.
	536	*
	537	* XXX This routine assumes that the packet has no options in place.
	538	*/
	539	static struct mbuf *
[dd967330]	540	ip_insertoptions(struct mbuf m, struct mbuf opt, int *phlen)
[39e6e65a]	541	{
	542	register struct ipoption p = mtod(opt, struct ipoption );
	543	struct mbuf *n;
	544	register struct ip ip = mtod(m, struct ip );
[387cc207]	545	uint32_t optlen;
[39e6e65a]	546
	547	optlen = opt->m_len - sizeof(p->ipopt_dst);
[387cc207]	548	if (optlen + ip->ip_len > IP_MAXPACKET)
[39e6e65a]	549	return (m); /* XXX should fail */
	550	if (p->ipopt_dst.s_addr)
	551	ip->ip_dst = p->ipopt_dst;
	552	if (m->m_flags & M_EXT \|\| m->m_data - optlen < m->m_pktdat) {
	553	MGETHDR(n, M_DONTWAIT, MT_HEADER);
	554	if (n == 0)
	555	return (m);
	556	n->m_pkthdr.len = m->m_pkthdr.len + optlen;
	557	m->m_len -= sizeof(struct ip);
	558	m->m_data += sizeof(struct ip);
	559	n->m_next = m;
	560	m = n;
	561	m->m_len = optlen + sizeof(struct ip);
	562	m->m_data += max_linkhdr;
	563	(void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
	564	} else {
	565	m->m_data -= optlen;
	566	m->m_len += optlen;
	567	m->m_pkthdr.len += optlen;
	568	ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
	569	}
	570	ip = mtod(m, struct ip *);
	571	bcopy(p->ipopt_list, ip + 1, optlen);
	572	*phlen = sizeof(struct ip) + optlen;
[491f63a]	573	#ifdef _IP_VHL
[39e6e65a]	574	ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
[491f63a]	575	#else
	576	ip->ip_v = IPVERSION;
	577	ip->ip_hl = *phlen >> 2;
	578	#endif
[39e6e65a]	579	ip->ip_len += optlen;
	580	return (m);
	581	}
	582
	583	/*
	584	* Copy options from ip to jp,
	585	* omitting those not copied during fragmentation.
	586	*/
	587	static int
[dd967330]	588	ip_optcopy(struct ip ip, struct ip jp)
[39e6e65a]	589	{
	590	register u_char cp, dp;
	591	int opt, optlen, cnt;
	592
	593	cp = (u_char *)(ip + 1);
	594	dp = (u_char *)(jp + 1);
[491f63a]	595	#ifdef _IP_VHL
[39e6e65a]	596	cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
[491f63a]	597	#else
	598	cnt = (ip->ip_hl << 2) - sizeof (struct ip);
	599	#endif
[39e6e65a]	600	for (; cnt > 0; cnt -= optlen, cp += optlen) {
	601	opt = cp[0];
	602	if (opt == IPOPT_EOL)
	603	break;
	604	if (opt == IPOPT_NOP) {
	605	/* Preserve for IP mcast tunnel's LSRR alignment. */
	606	*dp++ = IPOPT_NOP;
	607	optlen = 1;
	608	continue;
	609	} else
	610	optlen = cp[IPOPT_OLEN];
	611	/* bogus lengths should have been caught by ip_dooptions */
	612	if (optlen > cnt)
	613	optlen = cnt;
	614	if (IPOPT_COPIED(opt)) {
	615	bcopy(cp, dp, optlen);
	616	dp += optlen;
	617	}
	618	}
	619	for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
	620	*dp++ = IPOPT_EOL;
	621	return (optlen);
	622	}
	623
	624	/*
	625	* IP socket option processing.
	626	*/
	627	int
[dd967330]	628	ip_ctloutput(int op, struct socket *so, int level, int optname,
	629	struct mbuf **mp)
[39e6e65a]	630	{
[0c67b436]	631	struct inpcb *inp = sotoinpcb(so);
[39e6e65a]	632	register struct mbuf m = mp;
	633	register int optval = 0;
	634	int error = 0;
	635
	636	if (level != IPPROTO_IP) {
	637	error = EINVAL;
	638	if (op == PRCO_SETOPT && *mp)
	639	(void) m_free(*mp);
	640	} else switch (op) {
	641
	642	case PRCO_SETOPT:
	643	switch (optname) {
	644	case IP_OPTIONS:
	645	#ifdef notyet
	646	case IP_RETOPTS:
	647	return (ip_pcbopts(optname, &inp->inp_options, m));
	648	#else
	649	return (ip_pcbopts(&inp->inp_options, m));
	650	#endif
	651
	652	case IP_TOS:
	653	case IP_TTL:
	654	case IP_RECVOPTS:
	655	case IP_RECVRETOPTS:
	656	case IP_RECVDSTADDR:
	657	case IP_RECVIF:
	658	if (m == 0 \|\| m->m_len != sizeof(int))
	659	error = EINVAL;
	660	else {
	661	optval = mtod(m, int );
	662	switch (optname) {
	663
	664	case IP_TOS:
	665	inp->inp_ip_tos = optval;
	666	break;
	667
	668	case IP_TTL:
	669	inp->inp_ip_ttl = optval;
	670	break;
	671	#define OPTSET(bit) \
	672	if (optval) \
	673	inp->inp_flags \|= bit; \
	674	else \
	675	inp->inp_flags &= ~bit;
	676
	677	case IP_RECVOPTS:
	678	OPTSET(INP_RECVOPTS);
	679	break;
	680
	681	case IP_RECVRETOPTS:
	682	OPTSET(INP_RECVRETOPTS);
	683	break;
	684
	685	case IP_RECVDSTADDR:
	686	OPTSET(INP_RECVDSTADDR);
	687	break;
	688
	689	case IP_RECVIF:
	690	OPTSET(INP_RECVIF);
	691	break;
	692	}
	693	}
	694	break;
	695	#undef OPTSET
	696
	697	case IP_MULTICAST_IF:
	698	case IP_MULTICAST_VIF:
	699	case IP_MULTICAST_TTL:
	700	case IP_MULTICAST_LOOP:
	701	case IP_ADD_MEMBERSHIP:
	702	case IP_DROP_MEMBERSHIP:
	703	error = ip_setmoptions(optname, &inp->inp_moptions, m);
	704	break;
	705
	706	case IP_PORTRANGE:
	707	if (m == 0 \|\| m->m_len != sizeof(int))
	708	error = EINVAL;
	709	else {
	710	optval = mtod(m, int );
	711
	712	switch (optval) {
	713
	714	case IP_PORTRANGE_DEFAULT:
	715	inp->inp_flags &= ~(INP_LOWPORT);
	716	inp->inp_flags &= ~(INP_HIGHPORT);
	717	break;
	718
	719	case IP_PORTRANGE_HIGH:
	720	inp->inp_flags &= ~(INP_LOWPORT);
	721	inp->inp_flags \|= INP_HIGHPORT;
	722	break;
	723
	724	case IP_PORTRANGE_LOW:
	725	inp->inp_flags &= ~(INP_HIGHPORT);
	726	inp->inp_flags \|= INP_LOWPORT;
	727	break;
	728
	729	default:
	730	error = EINVAL;
	731	break;
	732	}
	733	}
	734	break;
	735
	736	default:
	737	error = ENOPROTOOPT;
	738	break;
	739	}
	740	if (m)
	741	(void)m_free(m);
	742	break;
	743
	744	case PRCO_GETOPT:
	745	switch (optname) {
	746	case IP_OPTIONS:
	747	case IP_RETOPTS:
	748	*mp = m = m_get(M_WAIT, MT_SOOPTS);
	749	if (inp->inp_options) {
	750	m->m_len = inp->inp_options->m_len;
	751	bcopy(mtod(inp->inp_options, void *),
	752	mtod(m, void *), m->m_len);
	753	} else
	754	m->m_len = 0;
	755	break;
	756
	757	case IP_TOS:
	758	case IP_TTL:
	759	case IP_RECVOPTS:
	760	case IP_RECVRETOPTS:
	761	case IP_RECVDSTADDR:
	762	case IP_RECVIF:
	763	*mp = m = m_get(M_WAIT, MT_SOOPTS);
	764	m->m_len = sizeof(int);
	765	switch (optname) {
	766
	767	case IP_TOS:
	768	optval = inp->inp_ip_tos;
	769	break;
	770
	771	case IP_TTL:
	772	optval = inp->inp_ip_ttl;
	773	break;
	774
	775	#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
	776
	777	case IP_RECVOPTS:
	778	optval = OPTBIT(INP_RECVOPTS);
	779	break;
	780
	781	case IP_RECVRETOPTS:
	782	optval = OPTBIT(INP_RECVRETOPTS);
	783	break;
	784
	785	case IP_RECVDSTADDR:
	786	optval = OPTBIT(INP_RECVDSTADDR);
	787	break;
	788
	789	case IP_RECVIF:
	790	optval = OPTBIT(INP_RECVIF);
	791	break;
	792	}
	793	mtod(m, int ) = optval;
	794	break;
	795
	796	case IP_MULTICAST_IF:
	797	case IP_MULTICAST_VIF:
	798	case IP_MULTICAST_TTL:
	799	case IP_MULTICAST_LOOP:
	800	case IP_ADD_MEMBERSHIP:
	801	case IP_DROP_MEMBERSHIP:
	802	error = ip_getmoptions(optname, inp->inp_moptions, mp);
	803	break;
	804
	805	case IP_PORTRANGE:
	806	*mp = m = m_get(M_WAIT, MT_SOOPTS);
	807	m->m_len = sizeof(int);
	808
	809	if (inp->inp_flags & INP_HIGHPORT)
	810	optval = IP_PORTRANGE_HIGH;
	811	else if (inp->inp_flags & INP_LOWPORT)
	812	optval = IP_PORTRANGE_LOW;
	813	else
	814	optval = 0;
	815
	816	mtod(m, int ) = optval;
	817	break;
	818
	819	default:
	820	error = ENOPROTOOPT;
	821	break;
	822	}
	823	break;
	824	}
	825	return (error);
	826	}
	827
	828	/*
	829	* Set up IP options in pcb for insertion in output packets.
	830	* Store in mbuf with pointer in pcbopt, adding pseudo-option
	831	* with destination address if source routed.
	832	*/
	833	static int
	834	#ifdef notyet
[dd967330]	835	ip_pcbopts(int optname, struct mbuf *pcbopt, struct mbuf m)
[39e6e65a]	836	#else
[dd967330]	837	ip_pcbopts(struct mbuf *pcbopt, struct mbuf m)
[39e6e65a]	838	#endif
	839	{
	840	register int cnt, optlen;
	841	register u_char *cp;
	842	u_char opt;
	843
	844	/* turn off any old options */
	845	if (*pcbopt)
	846	(void)m_free(*pcbopt);
	847	*pcbopt = 0;
	848	if (m == (struct mbuf *)0 \|\| m->m_len == 0) {
	849	/*
	850	* Only turning off any previous options.
	851	*/
	852	if (m)
	853	(void)m_free(m);
	854	return (0);
	855	}
	856
	857	#ifndef vax
	858	if (m->m_len % sizeof(long))
	859	goto bad;
	860	#endif
	861	/*
	862	* IP first-hop destination address will be stored before
	863	* actual options; move other options back
	864	* and clear it when none present.
	865	*/
	866	if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
	867	goto bad;
	868	cnt = m->m_len;
	869	m->m_len += sizeof(struct in_addr);
	870	cp = mtod(m, u_char *) + sizeof(struct in_addr);
	871	ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
	872	bzero(mtod(m, caddr_t), sizeof(struct in_addr));
	873
	874	for (; cnt > 0; cnt -= optlen, cp += optlen) {
	875	opt = cp[IPOPT_OPTVAL];
	876	if (opt == IPOPT_EOL)
	877	break;
	878	if (opt == IPOPT_NOP)
	879	optlen = 1;
	880	else {
	881	optlen = cp[IPOPT_OLEN];
	882	if (optlen <= IPOPT_OLEN \|\| optlen > cnt)
	883	goto bad;
	884	}
	885	switch (opt) {
	886
	887	default:
	888	break;
	889
	890	case IPOPT_LSRR:
	891	case IPOPT_SSRR:
	892	/*
	893	* user process specifies route as:
	894	* ->A->B->C->D
	895	* D must be our final destination (but we can't
	896	* check that since we may not have connected yet).
	897	* A is first hop destination, which doesn't appear in
	898	* actual IP option, but is stored before the options.
	899	*/
	900	if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
	901	goto bad;
	902	m->m_len -= sizeof(struct in_addr);
	903	cnt -= sizeof(struct in_addr);
	904	optlen -= sizeof(struct in_addr);
	905	cp[IPOPT_OLEN] = optlen;
	906	/*
	907	* Move first hop before start of options.
	908	*/
	909	bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
	910	sizeof(struct in_addr));
	911	/*
	912	* Then copy rest of options back
	913	* to close up the deleted entry.
	914	*/
	915	ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
	916	sizeof(struct in_addr)),
	917	(caddr_t)&cp[IPOPT_OFFSET+1],
	918	(unsigned)cnt + sizeof(struct in_addr));
	919	break;
	920	}
	921	}
	922	if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
	923	goto bad;
	924	*pcbopt = m;
	925	return (0);
	926
	927	bad:
	928	(void)m_free(m);
	929	return (EINVAL);
	930	}
	931
	932	/*
	933	* Set the IP multicast options in response to user setsockopt().
	934	*/
	935	static int
[dd967330]	936	ip_setmoptions(int optname, struct ip_moptions *imop, struct mbuf m)
[39e6e65a]	937	{
[0c67b436]	938	int error = 0;
[39e6e65a]	939	u_char loop;
[0c67b436]	940	int i;
[39e6e65a]	941	struct in_addr addr;
[0c67b436]	942	struct ip_mreq *mreq;
	943	struct ifnet *ifp;
	944	struct ip_moptions imo = imop;
[39e6e65a]	945	struct route ro;
	946	register struct sockaddr_in *dst;
	947	int s;
	948
	949	if (imo == NULL) {
	950	/*
	951	* No multicast option buffer attached to the pcb;
	952	* allocate one and initialize to default values.
	953	*/
	954	imo = (struct ip_moptions)malloc(sizeof(imo), M_IPMOPTS,
	955	M_WAITOK);
	956
	957	if (imo == NULL)
	958	return (ENOBUFS);
	959	*imop = imo;
	960	imo->imo_multicast_ifp = NULL;
	961	imo->imo_multicast_vif = -1;
	962	imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
	963	imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
	964	imo->imo_num_memberships = 0;
	965	}
	966
	967	switch (optname) {
	968	/* store an index number for the vif you wanna use in the send */
	969	case IP_MULTICAST_VIF:
	970	if (!legal_vif_num) {
	971	error = EOPNOTSUPP;
	972	break;
	973	}
	974	if (m == NULL \|\| m->m_len != sizeof(int)) {
	975	error = EINVAL;
	976	break;
	977	}
	978	i = (mtod(m, int ));
	979	if (!legal_vif_num(i) && (i != -1)) {
	980	error = EINVAL;
	981	break;
	982	}
	983	imo->imo_multicast_vif = i;
	984	break;
	985
	986	case IP_MULTICAST_IF:
	987	/*
	988	* Select the interface for outgoing multicast packets.
	989	*/
	990	if (m == NULL \|\| m->m_len != sizeof(struct in_addr)) {
	991	error = EINVAL;
	992	break;
	993	}
	994	addr = (mtod(m, struct in_addr ));
	995	/*
	996	* INADDR_ANY is used to remove a previous selection.
	997	* When no interface is selected, a default one is
	998	* chosen every time a multicast packet is sent.
	999	*/
	1000	if (addr.s_addr == INADDR_ANY) {
	1001	imo->imo_multicast_ifp = NULL;
	1002	break;
	1003	}
	1004	/*
	1005	* The selected interface is identified by its local
	1006	* IP address. Find the interface and confirm that
	1007	* it supports multicasting.
	1008	*/
	1009	s = splimp();
	1010	INADDR_TO_IFP(addr, ifp);
	1011	if (ifp == NULL \|\| (ifp->if_flags & IFF_MULTICAST) == 0) {
	1012	splx(s);
	1013	error = EADDRNOTAVAIL;
	1014	break;
	1015	}
	1016	imo->imo_multicast_ifp = ifp;
	1017	splx(s);
	1018	break;
	1019
	1020	case IP_MULTICAST_TTL:
	1021	/*
	1022	* Set the IP time-to-live for outgoing multicast packets.
	1023	*/
	1024	if (m == NULL \|\| m->m_len != 1) {
	1025	error = EINVAL;
	1026	break;
	1027	}
	1028	imo->imo_multicast_ttl = (mtod(m, u_char ));
	1029	break;
	1030
	1031	case IP_MULTICAST_LOOP:
	1032	/*
	1033	* Set the loopback flag for outgoing multicast packets.
	1034	* Must be zero or one.
	1035	*/
	1036	if (m == NULL \|\| m->m_len != 1 \|\|
	1037	(loop = (mtod(m, u_char ))) > 1) {
	1038	error = EINVAL;
	1039	break;
	1040	}
	1041	imo->imo_multicast_loop = loop;
	1042	break;
	1043
	1044	case IP_ADD_MEMBERSHIP:
	1045	/*
	1046	* Add a multicast group membership.
	1047	* Group must be a valid IP multicast address.
	1048	*/
	1049	if (m == NULL \|\| m->m_len != sizeof(struct ip_mreq)) {
	1050	error = EINVAL;
	1051	break;
	1052	}
	1053	mreq = mtod(m, struct ip_mreq *);
	1054	if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
	1055	error = EINVAL;
	1056	break;
	1057	}
	1058	s = splimp();
	1059	/*
	1060	* If no interface address was provided, use the interface of
	1061	* the route to the given multicast address.
	1062	*/
	1063	if (mreq->imr_interface.s_addr == INADDR_ANY) {
	1064	bzero((caddr_t)&ro, sizeof(ro));
	1065	dst = (struct sockaddr_in *)&ro.ro_dst;
	1066	dst->sin_len = sizeof(*dst);
	1067	dst->sin_family = AF_INET;
	1068	dst->sin_addr = mreq->imr_multiaddr;
	1069	rtalloc(&ro);
	1070	if (ro.ro_rt == NULL) {
	1071	error = EADDRNOTAVAIL;
	1072	splx(s);
	1073	break;
	1074	}
	1075	ifp = ro.ro_rt->rt_ifp;
	1076	rtfree(ro.ro_rt);
	1077	}
	1078	else {
	1079	INADDR_TO_IFP(mreq->imr_interface, ifp);
	1080	}
	1081
	1082	/*
	1083	* See if we found an interface, and confirm that it
	1084	* supports multicast.
	1085	*/
	1086	if (ifp == NULL \|\| (ifp->if_flags & IFF_MULTICAST) == 0) {
	1087	error = EADDRNOTAVAIL;
	1088	splx(s);
	1089	break;
	1090	}
	1091	/*
	1092	* See if the membership already exists or if all the
	1093	* membership slots are full.
	1094	*/
	1095	for (i = 0; i < imo->imo_num_memberships; ++i) {
	1096	if (imo->imo_membership[i]->inm_ifp == ifp &&
	1097	imo->imo_membership[i]->inm_addr.s_addr
	1098	== mreq->imr_multiaddr.s_addr)
	1099	break;
	1100	}
	1101	if (i < imo->imo_num_memberships) {
	1102	error = EADDRINUSE;
	1103	splx(s);
	1104	break;
	1105	}
	1106	if (i == IP_MAX_MEMBERSHIPS) {
	1107	error = ETOOMANYREFS;
	1108	splx(s);
	1109	break;
	1110	}
	1111	/*
	1112	* Everything looks good; add a new record to the multicast
	1113	* address list for the given interface.
	1114	*/
	1115	if ((imo->imo_membership[i] =
	1116	in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) {
	1117	error = ENOBUFS;
	1118	splx(s);
	1119	break;
	1120	}
	1121	++imo->imo_num_memberships;
	1122	splx(s);
	1123	break;
	1124
	1125	case IP_DROP_MEMBERSHIP:
	1126	/*
	1127	* Drop a multicast group membership.
	1128	* Group must be a valid IP multicast address.
	1129	*/
	1130	if (m == NULL \|\| m->m_len != sizeof(struct ip_mreq)) {
	1131	error = EINVAL;
	1132	break;
	1133	}
	1134	mreq = mtod(m, struct ip_mreq *);
	1135	if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
	1136	error = EINVAL;
	1137	break;
	1138	}
	1139
	1140	s = splimp();
	1141	/*
	1142	* If an interface address was specified, get a pointer
	1143	* to its ifnet structure.
	1144	*/
	1145	if (mreq->imr_interface.s_addr == INADDR_ANY)
	1146	ifp = NULL;
	1147	else {
	1148	INADDR_TO_IFP(mreq->imr_interface, ifp);
	1149	if (ifp == NULL) {
	1150	error = EADDRNOTAVAIL;
	1151	splx(s);
	1152	break;
	1153	}
	1154	}
	1155	/*
	1156	* Find the membership in the membership array.
	1157	*/
	1158	for (i = 0; i < imo->imo_num_memberships; ++i) {
	1159	if ((ifp == NULL \|\|
	1160	imo->imo_membership[i]->inm_ifp == ifp) &&
	1161	imo->imo_membership[i]->inm_addr.s_addr ==
	1162	mreq->imr_multiaddr.s_addr)
	1163	break;
	1164	}
	1165	if (i == imo->imo_num_memberships) {
	1166	error = EADDRNOTAVAIL;
	1167	splx(s);
	1168	break;
	1169	}
	1170	/*
	1171	* Give up the multicast address record to which the
	1172	* membership points.
	1173	*/
	1174	in_delmulti(imo->imo_membership[i]);
	1175	/*
	1176	* Remove the gap in the membership array.
	1177	*/
	1178	for (++i; i < imo->imo_num_memberships; ++i)
	1179	imo->imo_membership[i-1] = imo->imo_membership[i];
	1180	--imo->imo_num_memberships;
	1181	splx(s);
	1182	break;
	1183
	1184	default:
	1185	error = EOPNOTSUPP;
	1186	break;
	1187	}
	1188
	1189	/*
	1190	* If all options have default values, no need to keep the mbuf.
	1191	*/
	1192	if (imo->imo_multicast_ifp == NULL &&
	1193	imo->imo_multicast_vif == -1 &&
	1194	imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
	1195	imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
	1196	imo->imo_num_memberships == 0) {
	1197	free(*imop, M_IPMOPTS);
	1198	*imop = NULL;
	1199	}
	1200
	1201	return (error);
	1202	}
	1203
	1204	/*
	1205	* Return the IP multicast options in response to user getsockopt().
	1206	*/
	1207	static int
[dd967330]	1208	ip_getmoptions(int optname, struct ip_moptions *imo,
	1209	struct mbuf **mp)
[39e6e65a]	1210	{
	1211	u_char *ttl;
	1212	u_char *loop;
	1213	struct in_addr *addr;
	1214	struct in_ifaddr *ia;
	1215
	1216	*mp = m_get(M_WAIT, MT_SOOPTS);
	1217
	1218	switch (optname) {
	1219
	1220	case IP_MULTICAST_VIF:
	1221	if (imo != NULL)
	1222	(mtod(mp, int *)) = imo->imo_multicast_vif;
	1223	else
	1224	(mtod(mp, int *)) = -1;
	1225	(*mp)->m_len = sizeof(int);
	1226	return(0);
	1227
	1228	case IP_MULTICAST_IF:
	1229	addr = mtod(mp, struct in_addr );
	1230	(*mp)->m_len = sizeof(struct in_addr);
	1231	if (imo == NULL \|\| imo->imo_multicast_ifp == NULL)
	1232	addr->s_addr = INADDR_ANY;
	1233	else {
	1234	IFP_TO_IA(imo->imo_multicast_ifp, ia);
	1235	addr->s_addr = (ia == NULL) ? INADDR_ANY
	1236	: IA_SIN(ia)->sin_addr.s_addr;
	1237	}
	1238	return (0);
	1239
	1240	case IP_MULTICAST_TTL:
	1241	ttl = mtod(mp, u_char );
	1242	(*mp)->m_len = 1;
	1243	*ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL
	1244	: imo->imo_multicast_ttl;
	1245	return (0);
	1246
	1247	case IP_MULTICAST_LOOP:
	1248	loop = mtod(mp, u_char );
	1249	(*mp)->m_len = 1;
	1250	*loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP
	1251	: imo->imo_multicast_loop;
	1252	return (0);
	1253
	1254	default:
	1255	return (EOPNOTSUPP);
	1256	}
	1257	}
	1258
	1259	/*
	1260	* Discard the IP multicast options.
	1261	*/
	1262	void
[dd967330]	1263	ip_freemoptions(struct ip_moptions *imo)
[39e6e65a]	1264	{
	1265	register int i;
	1266
	1267	if (imo != NULL) {
	1268	for (i = 0; i < imo->imo_num_memberships; ++i)
	1269	in_delmulti(imo->imo_membership[i]);
	1270	free(imo, M_IPMOPTS);
	1271	}
	1272	}
	1273
	1274	/*
	1275	* Routine called from ip_output() to loop back a copy of an IP multicast
	1276	* packet to the input queue of a specified interface. Note that this
	1277	* calls the output routine of the loopback "driver", but with an interface
	1278	* pointer that might NOT be a loopback interface -- evil, but easier than
	1279	* replicating that code here.
	1280	*/
	1281	static void
[dd967330]	1282	ip_mloopback(struct ifnet ifp, struct mbuf m, struct sockaddr_in *dst,
	1283	int hlen)
[39e6e65a]	1284	{
	1285	register struct ip *ip;
	1286	struct mbuf *copym;
	1287
	1288	copym = m_copy(m, 0, M_COPYALL);
	1289	if (copym != NULL && (copym->m_flags & M_EXT \|\| copym->m_len < hlen))
	1290	copym = m_pullup(copym, hlen);
	1291	if (copym != NULL) {
	1292	/*
	1293	* We don't bother to fragment if the IP length is greater
	1294	* than the interface's MTU. Can this possibly matter?
	1295	*/
	1296	ip = mtod(copym, struct ip *);
[0c67b436]	1297	ip->ip_len = htons(ip->ip_len);
	1298	ip->ip_off = htons(ip->ip_off);
[39e6e65a]	1299	ip->ip_sum = 0;
[f94e799e]	1300	#ifdef _IP_VHL
[39e6e65a]	1301	if (ip->ip_vhl == IP_VHL_BORING) {
	1302	ip->ip_sum = in_cksum_hdr(ip);
	1303	} else {
	1304	ip->ip_sum = in_cksum(copym, hlen);
	1305	}
[f94e799e]	1306	#else
	1307	ip->ip_sum = in_cksum(copym, hlen);
	1308	#endif
[39e6e65a]	1309	/*
	1310	* NB:
	1311	* It's not clear whether there are any lingering
	1312	* reentrancy problems in other areas which might
	1313	* be exposed by using ip_input directly (in
	1314	* particular, everything which modifies the packet
	1315	* in-place). Yet another option is using the
	1316	* protosw directly to deliver the looped back
	1317	* packet. For the moment, we'll err on the side
	1318	* of safety by continuing to abuse looutput().
	1319	*/
	1320	#ifdef notdef
	1321	copym->m_pkthdr.rcvif = ifp;
[f94e799e]	1322	ip_input(copym);
[39e6e65a]	1323	#else
	1324	(void) looutput(ifp, copym, (struct sockaddr *)dst, NULL);
	1325	#endif
	1326	}
	1327	}

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