[apple/xnu.git] / bsd / netinet6 / udp6_output.c

/*	$FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $	*/
/*	$KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)udp_var.h	8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_pcb.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/udp6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/ip6protosw.h>

#ifdef IPSEC
#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
extern int ipsec_bypass;
#endif /*IPSEC*/

#include "faith.h"

#include <net/net_osdep.h>

/*
 * UDP protocol inplementation.
 * Per RFC 768, August, 1980.
 */

#define in6pcb		inpcb
#define udp6stat	udpstat
#define udp6s_opackets	udps_opackets

static __inline__ u_int16_t
get_socket_id(struct socket * s)
{
	u_int16_t 		val;

	if (s == NULL) {
	    return (0);
	}
	val = (u_int16_t)(((u_int32_t)s) / sizeof(struct socket));
	if (val == 0) {
		val = 0xffff;
	}
	return (val);
}

int
udp6_output(in6p, m, addr6, control, p)
	struct in6pcb *in6p;
	struct mbuf *m;
	struct mbuf *control;
	struct sockaddr *addr6;
	struct proc *p;
{
	u_int32_t ulen = m->m_pkthdr.len;
	u_int32_t plen = sizeof(struct udphdr) + ulen;
	struct ip6_hdr *ip6;
	struct udphdr *udp6;
	struct in6_addr *laddr, *faddr;
	u_short fport;
	int error = 0;
	struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
	int priv;
	int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
	int flags;
	struct sockaddr_in6 tmp;
	struct	in6_addr storage;

	priv = 0;
#ifdef __APPLE__
	if (p && !proc_suser(p))
#else
	if (p && !suser(p))
#endif
		priv = 1;
	if (control) {
		if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
			goto release;
		in6p->in6p_outputopts = &opt;
	}

	if (addr6) {
		/*
		 * IPv4 version of udp_output calls in_pcbconnect in this case,
		 * which needs splnet and affects performance.
		 * Since we saw no essential reason for calling in_pcbconnect,
		 * we get rid of such kind of logic, and call in6_selectsrc
		 * and in6_pcbsetport in order to fill in the local address
		 * and the local port.
		 */
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
		if (sin6->sin6_port == 0) {
			error = EADDRNOTAVAIL;
			goto release;
		}

		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
			/* how about ::ffff:0.0.0.0 case? */
			error = EISCONN;
			goto release;
		}

		/* protect *sin6 from overwrites */
		tmp = *sin6;
		sin6 = &tmp;

		faddr = &sin6->sin6_addr;
		fport = sin6->sin6_port; /* allow 0 port */

		if (IN6_IS_ADDR_V4MAPPED(faddr)) {
			if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
				/*
				 * I believe we should explicitly discard the
				 * packet when mapped addresses are disabled,
				 * rather than send the packet as an IPv6 one.
				 * If we chose the latter approach, the packet
				 * might be sent out on the wire based on the
				 * default route, the situation which we'd
				 * probably want to avoid.
				 * (20010421 jinmei@kame.net)
				 */
				error = EINVAL;
				goto release;
			} else
				af = AF_INET;
		}

		/* KAME hack: embed scopeid */
		if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
			error = EINVAL;
			goto release;
		}

		if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
			laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
					      in6p->in6p_moptions,
					      &in6p->in6p_route,
					      &in6p->in6p_laddr, &storage, &error);
		} else
			laddr = &in6p->in6p_laddr;	/* XXX */
		if (laddr == NULL) {
			if (error == 0)
				error = EADDRNOTAVAIL;
			goto release;
		}
		if (in6p->in6p_lport == 0 &&
		    (error = in6_pcbsetport(laddr, in6p, p, 0)) != 0)
			goto release;
	} else {
		if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
			error = ENOTCONN;
			goto release;
		}
		if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
			if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
				/*
				 * XXX: this case would happen when the
				 * application sets the V6ONLY flag after
				 * connecting the foreign address.
				 * Such applications should be fixed,
				 * so we bark here.
				 */
				log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
				    "option was set for a connected socket\n");
				error = EINVAL;
				goto release;
			} else
				af = AF_INET;
		}
		laddr = &in6p->in6p_laddr;
		faddr = &in6p->in6p_faddr;
		fport = in6p->in6p_fport;
	}

	if (af == AF_INET)
		hlen = sizeof(struct ip);

	/*
	 * Calculate data length and get a mbuf
	 * for UDP and IP6 headers.
	 */
	M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
	if (m == 0) {
		error = ENOBUFS;
		goto release;
	}

	/*
	 * Stuff checksum and output datagram.
	 */
	udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
	udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
	udp6->uh_dport = fport;
	if (plen <= 0xffff)
		udp6->uh_ulen = htons((u_short)plen);
	else
		udp6->uh_ulen = 0;
	udp6->uh_sum = 0;

	switch (af) {
	case AF_INET6:
		ip6 = mtod(m, struct ip6_hdr *);
		ip6->ip6_flow	= in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
		ip6->ip6_vfc 	&= ~IPV6_VERSION_MASK;
		ip6->ip6_vfc 	|= IPV6_VERSION;
#if 0				/* ip6_plen will be filled in ip6_output. */
		ip6->ip6_plen	= htons((u_short)plen);
#endif
		ip6->ip6_nxt	= IPPROTO_UDP;
		ip6->ip6_hlim	= in6_selecthlim(in6p,
						 in6p->in6p_route.ro_rt ?
						 in6p->in6p_route.ro_rt->rt_ifp : NULL);
		ip6->ip6_src	= *laddr;
		ip6->ip6_dst	= *faddr;

		if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
				sizeof(struct ip6_hdr), plen)) == 0) {
			udp6->uh_sum = 0xffff;
		}

		flags = 0;

		udp6stat.udp6s_opackets++;
#ifdef IPSEC
		if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
			error = ENOBUFS;
			goto release;
		}
#endif /*IPSEC*/
		m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket);
		error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
		    flags, in6p->in6p_moptions, NULL, 0);
		break;
	case AF_INET:
		error = EAFNOSUPPORT;
		goto release;
	}
	goto releaseopt;

release:
	m_freem(m);

releaseopt:
	if (control) {
		ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
		in6p->in6p_outputopts = stickyopt;
		m_freem(control);
	}
	return(error);
}
Commit	Line	Data
9bccf70c A	1	/* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $ */
	2	/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */
	3
	4	/*
	5	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the name of the project nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
	33	/*
	34	* Copyright (c) 1982, 1986, 1989, 1993
	35	* The Regents of the University of California. All rights reserved.
	36	*
	37	* Redistribution and use in source and binary forms, with or without
	38	* modification, are permitted provided that the following conditions
	39	* are met:
	40	* 1. Redistributions of source code must retain the above copyright
	41	* notice, this list of conditions and the following disclaimer.
	42	* 2. Redistributions in binary form must reproduce the above copyright
	43	* notice, this list of conditions and the following disclaimer in the
	44	* documentation and/or other materials provided with the distribution.
	45	* 3. All advertising materials mentioning features or use of this software
	46	* must display the following acknowledgement:
	47	* This product includes software developed by the University of
	48	* California, Berkeley and its contributors.
	49	* 4. Neither the name of the University nor the names of its contributors
	50	* may be used to endorse or promote products derived from this software
	51	* without specific prior written permission.
	52	*
	53	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	54	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	55	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	56	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	57	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	58	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	59	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	60	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	61	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	62	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	63	* SUCH DAMAGE.
	64	*
65	* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
66	*/
67
68	#include <sys/param.h>
69	#include <sys/malloc.h>
70	#include <sys/mbuf.h>
71	#include <sys/protosw.h>
72	#include <sys/socket.h>
73	#include <sys/socketvar.h>
74	#include <sys/sysctl.h>
75	#include <sys/errno.h>
76	#include <sys/stat.h>
77	#include <sys/systm.h>
78	#include <sys/proc.h>
79	#include <sys/syslog.h>
80
81	#include <net/if.h>
82	#include <net/route.h>
83	#include <net/if_types.h>
84
85	#include <netinet/in.h>
86	#include <netinet/in_var.h>
87	#include <netinet/in_systm.h>
88	#include <netinet/ip.h>
89	#include <netinet/ip_var.h>
90	#include <netinet/in_pcb.h>
91	#include <netinet/udp.h>
92	#include <netinet/udp_var.h>
93	#include <netinet/ip6.h>
94	#include <netinet6/ip6_var.h>
95	#include <netinet6/in6_pcb.h>
96	#include <netinet6/udp6_var.h>
97	#include <netinet/icmp6.h>
98	#include <netinet6/ip6protosw.h>
99
100	#ifdef IPSEC
101	#include <netinet6/ipsec.h>
102	#ifdef INET6
103	#include <netinet6/ipsec6.h>
104	#endif
105	extern int ipsec_bypass;
106	#endif /IPSEC/
107
108	#include "faith.h"
109
110	#include <net/net_osdep.h>
111
112	/*
113	* UDP protocol inplementation.
114	* Per RFC 768, August, 1980.
115	*/
116
117	#define in6pcb inpcb
118	#define udp6stat udpstat
119	#define udp6s_opackets udps_opackets
120
91447636 A	121	static __inline__ u_int16_t
	122	get_socket_id(struct socket * s)
	123	{
	124	u_int16_t val;
	125
	126	if (s == NULL) {
	127	return (0);
	128	}
	129	val = (u_int16_t)(((u_int32_t)s) / sizeof(struct socket));
	130	if (val == 0) {
	131	val = 0xffff;
	132	}
	133	return (val);
	134	}
	135
9bccf70c A	136	int
	137	udp6_output(in6p, m, addr6, control, p)
	138	struct in6pcb *in6p;
	139	struct mbuf *m;
	140	struct mbuf *control;
	141	struct sockaddr *addr6;
	142	struct proc *p;
	143	{
	144	u_int32_t ulen = m->m_pkthdr.len;
	145	u_int32_t plen = sizeof(struct udphdr) + ulen;
	146	struct ip6_hdr *ip6;
	147	struct udphdr *udp6;
	148	struct in6_addr laddr, faddr;
	149	u_short fport;
	150	int error = 0;
	151	struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
	152	int priv;
	153	int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
	154	int flags;
	155	struct sockaddr_in6 tmp;
91447636	156	struct in6_addr storage;
9bccf70c A	157
	158	priv = 0;
	159	#ifdef __APPLE__
91447636	160	if (p && !proc_suser(p))
9bccf70c A	161	#else
	162	if (p && !suser(p))
	163	#endif
	164	priv = 1;
	165	if (control) {
	166	if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
	167	goto release;
	168	in6p->in6p_outputopts = &opt;
	169	}
	170
	171	if (addr6) {
	172	/*
	173	* IPv4 version of udp_output calls in_pcbconnect in this case,
	174	* which needs splnet and affects performance.
	175	* Since we saw no essential reason for calling in_pcbconnect,
	176	* we get rid of such kind of logic, and call in6_selectsrc
	177	* and in6_pcbsetport in order to fill in the local address
	178	* and the local port.
	179	*/
	180	struct sockaddr_in6 sin6 = (struct sockaddr_in6 )addr6;
	181	if (sin6->sin6_port == 0) {
	182	error = EADDRNOTAVAIL;
	183	goto release;
	184	}
	185
	186	if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
	187	/* how about ::ffff:0.0.0.0 case? */
	188	error = EISCONN;
	189	goto release;
	190	}
	191
	192	/* protect sin6 from overwrites /
	193	tmp = *sin6;
	194	sin6 = &tmp;
	195
	196	faddr = &sin6->sin6_addr;
	197	fport = sin6->sin6_port; /* allow 0 port */
	198
	199	if (IN6_IS_ADDR_V4MAPPED(faddr)) {
	200	if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
	201	/*
	202	* I believe we should explicitly discard the
	203	* packet when mapped addresses are disabled,
	204	* rather than send the packet as an IPv6 one.
	205	* If we chose the latter approach, the packet
	206	* might be sent out on the wire based on the
	207	* default route, the situation which we'd
	208	* probably want to avoid.
	209	* (20010421 jinmei@kame.net)
	210	*/
	211	error = EINVAL;
	212	goto release;
	213	} else
	214	af = AF_INET;
	215	}
	216
	217	/* KAME hack: embed scopeid */
	218	if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
	219	error = EINVAL;
	220	goto release;
	221	}
	222
	223	if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
	224	laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
225	in6p->in6p_moptions,
226	&in6p->in6p_route,
91447636	227	&in6p->in6p_laddr, &storage, &error);
9bccf70c A	228	} else
	229	laddr = &in6p->in6p_laddr; /* XXX */
	230	if (laddr == NULL) {
	231	if (error == 0)
	232	error = EADDRNOTAVAIL;
	233	goto release;
	234	}
	235	if (in6p->in6p_lport == 0 &&
91447636	236	(error = in6_pcbsetport(laddr, in6p, p, 0)) != 0)
9bccf70c A	237	goto release;
	238	} else {
	239	if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
	240	error = ENOTCONN;
	241	goto release;
	242	}
	243	if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
	244	if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
	245	/*
	246	* XXX: this case would happen when the
	247	* application sets the V6ONLY flag after
	248	* connecting the foreign address.
	249	* Such applications should be fixed,
	250	* so we bark here.
	251	*/
	252	log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
	253	"option was set for a connected socket\n");
	254	error = EINVAL;
	255	goto release;
	256	} else
	257	af = AF_INET;
	258	}
	259	laddr = &in6p->in6p_laddr;
	260	faddr = &in6p->in6p_faddr;
	261	fport = in6p->in6p_fport;
	262	}
	263
	264	if (af == AF_INET)
	265	hlen = sizeof(struct ip);
	266
	267	/*
	268	* Calculate data length and get a mbuf
	269	* for UDP and IP6 headers.
	270	*/
	271	M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
	272	if (m == 0) {
	273	error = ENOBUFS;
	274	goto release;
	275	}
	276
	277	/*
	278	* Stuff checksum and output datagram.
	279	*/
	280	udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
	281	udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
	282	udp6->uh_dport = fport;
	283	if (plen <= 0xffff)
	284	udp6->uh_ulen = htons((u_short)plen);
	285	else
	286	udp6->uh_ulen = 0;
	287	udp6->uh_sum = 0;
	288
	289	switch (af) {
	290	case AF_INET6:
	291	ip6 = mtod(m, struct ip6_hdr *);
	292	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
	293	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
	294	ip6->ip6_vfc \|= IPV6_VERSION;
	295	#if 0 /* ip6_plen will be filled in ip6_output. */
	296	ip6->ip6_plen = htons((u_short)plen);
	297	#endif
	298	ip6->ip6_nxt = IPPROTO_UDP;
	299	ip6->ip6_hlim = in6_selecthlim(in6p,
	300	in6p->in6p_route.ro_rt ?
301	in6p->in6p_route.ro_rt->rt_ifp : NULL);
302	ip6->ip6_src = *laddr;
303	ip6->ip6_dst = *faddr;
304
305	if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
306	sizeof(struct ip6_hdr), plen)) == 0) {
307	udp6->uh_sum = 0xffff;
308	}
309
310	flags = 0;
311
312	udp6stat.udp6s_opackets++;
313	#ifdef IPSEC
314	if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
315	error = ENOBUFS;
316	goto release;
317	}
318	#endif /IPSEC/
91447636	319	m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket);
9bccf70c	320	error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
91447636	321	flags, in6p->in6p_moptions, NULL, 0);
9bccf70c A	322	break;
	323	case AF_INET:
	324	error = EAFNOSUPPORT;
	325	goto release;
	326	}
	327	goto releaseopt;
	328
	329	release:
	330	m_freem(m);
	331
	332	releaseopt:
	333	if (control) {
	334	ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
	335	in6p->in6p_outputopts = stickyopt;
	336	m_freem(control);
	337	}
	338	return(error);
	339	}