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

/*
 * Copyright (c) 2009 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */


/*	$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)(((uintptr_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 = (proc_suser(p) == 0);

	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);
#if PKT_PRIORITY
		if (soisbackground(in6p->in6p_socket))
			m_prio_background(m);
#endif /* PKT_PRIORITY */
		error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
		    flags, in6p->in6p_moptions, NULL, 0);

#if IFNET_ROUTE_REFCNT
		/*
		 * Always discard the cached route for unconnected socket
		 * or if it is a multicast route.
		 */
		if (in6p->in6p_route.ro_rt != NULL &&
		    ((in6p->in6p_route.ro_rt->rt_flags & RTF_MULTICAST) ||
		    in6p->in6p_socket == NULL ||
		    in6p->in6p_socket->so_state != SS_ISCONNECTED)) {
			rtfree(in6p->in6p_route.ro_rt);
			in6p->in6p_route.ro_rt = NULL;
		}
#endif /* IFNET_ROUTE_REFCNT */
		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
b0d623f7	1	/*
d1ecb069	2	* Copyright (c) 2009 Apple Inc. All rights reserved.
b0d623f7 A	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29
9bccf70c A	30	/* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $ */
	31	/* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */
	32
	33	/*
	34	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	35	* 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. Neither the name of the project nor the names of its contributors
	46	* may be used to endorse or promote products derived from this software
	47	* without specific prior written permission.
	48	*
	49	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	50	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	51	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	52	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	53	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	54	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	55	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	56	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	57	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	58	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	59	* SUCH DAMAGE.
	60	*/
	61
	62	/*
	63	* Copyright (c) 1982, 1986, 1989, 1993
	64	* The Regents of the University of California. All rights reserved.
	65	*
	66	* Redistribution and use in source and binary forms, with or without
	67	* modification, are permitted provided that the following conditions
	68	* are met:
	69	* 1. Redistributions of source code must retain the above copyright
	70	* notice, this list of conditions and the following disclaimer.
	71	* 2. Redistributions in binary form must reproduce the above copyright
	72	* notice, this list of conditions and the following disclaimer in the
	73	* documentation and/or other materials provided with the distribution.
	74	* 3. All advertising materials mentioning features or use of this software
	75	* must display the following acknowledgement:
	76	* This product includes software developed by the University of
	77	* California, Berkeley and its contributors.
	78	* 4. Neither the name of the University nor the names of its contributors
	79	* may be used to endorse or promote products derived from this software
	80	* without specific prior written permission.
	81	*
	82	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	83	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	84	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	85	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	86	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	87	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	88	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	89	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	90	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	91	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	92	* SUCH DAMAGE.
	93	*
94	* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
95	*/
96
97	#include <sys/param.h>
98	#include <sys/malloc.h>
99	#include <sys/mbuf.h>
100	#include <sys/protosw.h>
101	#include <sys/socket.h>
102	#include <sys/socketvar.h>
103	#include <sys/sysctl.h>
104	#include <sys/errno.h>
105	#include <sys/stat.h>
106	#include <sys/systm.h>
107	#include <sys/proc.h>
108	#include <sys/syslog.h>
109
110	#include <net/if.h>
111	#include <net/route.h>
112	#include <net/if_types.h>
113
114	#include <netinet/in.h>
115	#include <netinet/in_var.h>
116	#include <netinet/in_systm.h>
117	#include <netinet/ip.h>
118	#include <netinet/ip_var.h>
119	#include <netinet/in_pcb.h>
120	#include <netinet/udp.h>
121	#include <netinet/udp_var.h>
122	#include <netinet/ip6.h>
123	#include <netinet6/ip6_var.h>
124	#include <netinet6/in6_pcb.h>
125	#include <netinet6/udp6_var.h>
126	#include <netinet/icmp6.h>
127	#include <netinet6/ip6protosw.h>
128
129	#ifdef IPSEC
130	#include <netinet6/ipsec.h>
131	#ifdef INET6
132	#include <netinet6/ipsec6.h>
133	#endif
134	extern int ipsec_bypass;
135	#endif /IPSEC/
136
137	#include "faith.h"
138
139	#include <net/net_osdep.h>
140
141	/*
142	* UDP protocol inplementation.
143	* Per RFC 768, August, 1980.
144	*/
145
146	#define in6pcb inpcb
147	#define udp6stat udpstat
148	#define udp6s_opackets udps_opackets
149
91447636 A	150	static __inline__ u_int16_t
	151	get_socket_id(struct socket * s)
	152	{
	153	u_int16_t val;
	154
	155	if (s == NULL) {
	156	return (0);
	157	}
b0d623f7	158	val = (u_int16_t)(((uintptr_t)s) / sizeof(struct socket));
91447636 A	159	if (val == 0) {
	160	val = 0xffff;
	161	}
	162	return (val);
	163	}
	164
9bccf70c A	165	int
	166	udp6_output(in6p, m, addr6, control, p)
	167	struct in6pcb *in6p;
	168	struct mbuf *m;
	169	struct mbuf *control;
	170	struct sockaddr *addr6;
	171	struct proc *p;
	172	{
	173	u_int32_t ulen = m->m_pkthdr.len;
	174	u_int32_t plen = sizeof(struct udphdr) + ulen;
	175	struct ip6_hdr *ip6;
	176	struct udphdr *udp6;
	177	struct in6_addr laddr, faddr;
	178	u_short fport;
	179	int error = 0;
	180	struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
	181	int priv;
	182	int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
	183	int flags;
	184	struct sockaddr_in6 tmp;
91447636	185	struct in6_addr storage;
9bccf70c	186
b0d623f7 A	187	priv = (proc_suser(p) == 0);
b0d623f7 A	188
9bccf70c A	189	if (control) {
	190	if ((error = ip6_setpktoptions(control, &opt, priv, 0)) != 0)
	191	goto release;
	192	in6p->in6p_outputopts = &opt;
	193	}
	194
	195	if (addr6) {
	196	/*
	197	* IPv4 version of udp_output calls in_pcbconnect in this case,
	198	* which needs splnet and affects performance.
	199	* Since we saw no essential reason for calling in_pcbconnect,
	200	* we get rid of such kind of logic, and call in6_selectsrc
	201	* and in6_pcbsetport in order to fill in the local address
	202	* and the local port.
	203	*/
	204	struct sockaddr_in6 sin6 = (struct sockaddr_in6 )addr6;
	205	if (sin6->sin6_port == 0) {
	206	error = EADDRNOTAVAIL;
	207	goto release;
	208	}
	209
	210	if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
	211	/* how about ::ffff:0.0.0.0 case? */
	212	error = EISCONN;
	213	goto release;
	214	}
	215
	216	/* protect sin6 from overwrites /
	217	tmp = *sin6;
	218	sin6 = &tmp;
	219
	220	faddr = &sin6->sin6_addr;
	221	fport = sin6->sin6_port; /* allow 0 port */
	222
	223	if (IN6_IS_ADDR_V4MAPPED(faddr)) {
	224	if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
	225	/*
	226	* I believe we should explicitly discard the
	227	* packet when mapped addresses are disabled,
	228	* rather than send the packet as an IPv6 one.
	229	* If we chose the latter approach, the packet
	230	* might be sent out on the wire based on the
	231	* default route, the situation which we'd
	232	* probably want to avoid.
	233	* (20010421 jinmei@kame.net)
	234	*/
	235	error = EINVAL;
	236	goto release;
	237	} else
	238	af = AF_INET;
	239	}
	240
	241	/* KAME hack: embed scopeid */
	242	if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
	243	error = EINVAL;
	244	goto release;
	245	}
	246
	247	if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
	248	laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
	249	in6p->in6p_moptions,
	250	&in6p->in6p_route,
91447636	251	&in6p->in6p_laddr, &storage, &error);
9bccf70c A	252	} else
	253	laddr = &in6p->in6p_laddr; /* XXX */
	254	if (laddr == NULL) {
	255	if (error == 0)
	256	error = EADDRNOTAVAIL;
	257	goto release;
	258	}
	259	if (in6p->in6p_lport == 0 &&
91447636	260	(error = in6_pcbsetport(laddr, in6p, p, 0)) != 0)
9bccf70c A	261	goto release;
	262	} else {
	263	if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
	264	error = ENOTCONN;
	265	goto release;
	266	}
	267	if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
	268	if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
	269	/*
	270	* XXX: this case would happen when the
	271	* application sets the V6ONLY flag after
	272	* connecting the foreign address.
	273	* Such applications should be fixed,
	274	* so we bark here.
	275	*/
	276	log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
	277	"option was set for a connected socket\n");
	278	error = EINVAL;
	279	goto release;
	280	} else
	281	af = AF_INET;
	282	}
	283	laddr = &in6p->in6p_laddr;
	284	faddr = &in6p->in6p_faddr;
	285	fport = in6p->in6p_fport;
	286	}
	287
	288	if (af == AF_INET)
	289	hlen = sizeof(struct ip);
	290
	291	/*
	292	* Calculate data length and get a mbuf
	293	* for UDP and IP6 headers.
	294	*/
	295	M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
	296	if (m == 0) {
	297	error = ENOBUFS;
	298	goto release;
	299	}
	300
	301	/*
	302	* Stuff checksum and output datagram.
	303	*/
	304	udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
	305	udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
	306	udp6->uh_dport = fport;
	307	if (plen <= 0xffff)
	308	udp6->uh_ulen = htons((u_short)plen);
	309	else
	310	udp6->uh_ulen = 0;
	311	udp6->uh_sum = 0;
	312
	313	switch (af) {
	314	case AF_INET6:
	315	ip6 = mtod(m, struct ip6_hdr *);
	316	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
	317	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
	318	ip6->ip6_vfc \|= IPV6_VERSION;
	319	#if 0 /* ip6_plen will be filled in ip6_output. */
	320	ip6->ip6_plen = htons((u_short)plen);
	321	#endif
	322	ip6->ip6_nxt = IPPROTO_UDP;
	323	ip6->ip6_hlim = in6_selecthlim(in6p,
	324	in6p->in6p_route.ro_rt ?
325	in6p->in6p_route.ro_rt->rt_ifp : NULL);
326	ip6->ip6_src = *laddr;
327	ip6->ip6_dst = *faddr;
328
329	if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
330	sizeof(struct ip6_hdr), plen)) == 0) {
331	udp6->uh_sum = 0xffff;
332	}
333
334	flags = 0;
335
336	udp6stat.udp6s_opackets++;
337	#ifdef IPSEC
338	if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
339	error = ENOBUFS;
340	goto release;
341	}
342	#endif /IPSEC/
91447636	343	m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket);
d1ecb069 A	344	#if PKT_PRIORITY
	345	if (soisbackground(in6p->in6p_socket))
	346	m_prio_background(m);
	347	#endif /* PKT_PRIORITY */
9bccf70c	348	error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
91447636	349	flags, in6p->in6p_moptions, NULL, 0);
d1ecb069 A	350
	351	#if IFNET_ROUTE_REFCNT
	352	/*
	353	* Always discard the cached route for unconnected socket
	354	* or if it is a multicast route.
	355	*/
	356	if (in6p->in6p_route.ro_rt != NULL &&
	357	((in6p->in6p_route.ro_rt->rt_flags & RTF_MULTICAST) \|\|
	358	in6p->in6p_socket == NULL \|\|
	359	in6p->in6p_socket->so_state != SS_ISCONNECTED)) {
	360	rtfree(in6p->in6p_route.ro_rt);
	361	in6p->in6p_route.ro_rt = NULL;
	362	}
	363	#endif /* IFNET_ROUTE_REFCNT */
9bccf70c A	364	break;
	365	case AF_INET:
	366	error = EAFNOSUPPORT;
	367	goto release;
	368	}
	369	goto releaseopt;
	370
	371	release:
	372	m_freem(m);
	373
	374	releaseopt:
	375	if (control) {
	376	ip6_clearpktopts(in6p->in6p_outputopts, 0, -1);
	377	in6p->in6p_outputopts = stickyopt;
	378	m_freem(control);
	379	}
	380	return(error);
	381	}