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

/*
 * Copyright (c) 2000-2011 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 <machine/endian.h>

#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>
#include <net/ntstat.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, *optp = NULL;
	struct ip6_moptions *im6o;
	int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
	int flags;
	struct sockaddr_in6 tmp;
	struct	in6_addr storage;
	mbuf_traffic_class_t mtc = MBUF_TC_UNSPEC;
	struct ip6_out_args ip6oa = { IFSCOPE_NONE, 0 };

	if (in6p->inp_flags & INP_BOUND_IF)
		ip6oa.ip6oa_boundif = in6p->inp_boundif;

	ip6oa.ip6oa_nocell = (in6p->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;

	if (control) {
		mtc = mbuf_traffic_class_from_control(control);

		if ((error = ip6_setpktopts(control, &opt, NULL, IPPROTO_UDP)) != 0)
			goto release;
		optp = &opt;
	} else
		optp = in6p->in6p_outputopts;

	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,
		    optp) != 0) {
			error = EINVAL;
			goto release;
		}

		if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
			laddr = in6_selectsrc(sin6, optp,
			    in6p, &in6p->in6p_route, NULL, &storage,
			    ip6oa.ip6oa_boundif, &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;

		udp6->uh_sum = in6_cksum_phdr(laddr, faddr,
		    htonl(plen), htonl(IPPROTO_UDP));
		m->m_pkthdr.csum_flags = CSUM_UDPIPV6;
		m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);

		flags = IPV6_OUTARGS;

		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);

		set_packet_tclass(m, in6p->in6p_socket, mtc, 1);

		im6o = in6p->in6p_moptions;
		if (im6o != NULL)
			IM6O_ADDREF(im6o);

		error = ip6_output(m, optp, &in6p->in6p_route,
		    flags, im6o, NULL, &ip6oa);

		if (im6o != NULL)
			IM6O_REMREF(im6o);
		
		if (error == 0 && nstat_collect) {
			locked_add_64(&in6p->inp_stat->txpackets, 1);
			locked_add_64(&in6p->inp_stat->txbytes, ulen);
		}

		if (in6p->in6p_route.ro_rt != NULL) {
			struct rtentry *rt = in6p->in6p_route.ro_rt;
			unsigned int outif;

			if ((rt->rt_flags & RTF_MULTICAST) ||
			    in6p->in6p_socket == NULL ||
			    !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
				rt = NULL;	/* unusable */
			}
			/*
			 * Always discard the cached route for unconnected
			 * socket or if it is a multicast route.
			 */
			if (rt == NULL) {
				rtfree(in6p->in6p_route.ro_rt);
				in6p->in6p_route.ro_rt = NULL;
			}
			/*
			 * If this is a connected socket and the destination
			 * route is not multicast, update outif with that of
			 * the route interface index used by IP.
			 */
			if (rt != NULL && (outif = rt->rt_ifp->if_index) !=
			    in6p->in6p_last_outif)
				in6p->in6p_last_outif = outif;
		}
		break;
	case AF_INET:
		error = EAFNOSUPPORT;
		goto release;
	}
	goto releaseopt;

release:
	m_freem(m);

releaseopt:
	if (control) {
		if (optp == &opt)
			ip6_clearpktopts(optp, -1);
		m_freem(control);
	}
	return(error);
}
Commit	Line	Data
b0d623f7	1	/*
6d2010ae	2	* Copyright (c) 2000-2011 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
6d2010ae A	110	#include <machine/endian.h>
6d2010ae A	111
9bccf70c A	112	#include <net/if.h>
	113	#include <net/route.h>
	114	#include <net/if_types.h>
6d2010ae	115	#include <net/ntstat.h>
9bccf70c A	116
	117	#include <netinet/in.h>
	118	#include <netinet/in_var.h>
	119	#include <netinet/in_systm.h>
	120	#include <netinet/ip.h>
	121	#include <netinet/ip_var.h>
	122	#include <netinet/in_pcb.h>
	123	#include <netinet/udp.h>
	124	#include <netinet/udp_var.h>
	125	#include <netinet/ip6.h>
	126	#include <netinet6/ip6_var.h>
	127	#include <netinet6/in6_pcb.h>
	128	#include <netinet6/udp6_var.h>
	129	#include <netinet/icmp6.h>
	130	#include <netinet6/ip6protosw.h>
	131
	132	#ifdef IPSEC
	133	#include <netinet6/ipsec.h>
	134	#ifdef INET6
	135	#include <netinet6/ipsec6.h>
	136	#endif
	137	extern int ipsec_bypass;
	138	#endif /IPSEC/
	139
	140	#include "faith.h"
	141
	142	#include <net/net_osdep.h>
	143
	144	/*
	145	* UDP protocol inplementation.
	146	* Per RFC 768, August, 1980.
	147	*/
	148
	149	#define in6pcb inpcb
	150	#define udp6stat udpstat
	151	#define udp6s_opackets udps_opackets
	152
91447636 A	153	static __inline__ u_int16_t
	154	get_socket_id(struct socket * s)
	155	{
	156	u_int16_t val;
	157
	158	if (s == NULL) {
	159	return (0);
	160	}
b0d623f7	161	val = (u_int16_t)(((uintptr_t)s) / sizeof(struct socket));
91447636 A	162	if (val == 0) {
	163	val = 0xffff;
	164	}
	165	return (val);
	166	}
	167
9bccf70c A	168	int
	169	udp6_output(in6p, m, addr6, control, p)
	170	struct in6pcb *in6p;
	171	struct mbuf *m;
	172	struct mbuf *control;
	173	struct sockaddr *addr6;
	174	struct proc *p;
	175	{
	176	u_int32_t ulen = m->m_pkthdr.len;
	177	u_int32_t plen = sizeof(struct udphdr) + ulen;
	178	struct ip6_hdr *ip6;
	179	struct udphdr *udp6;
	180	struct in6_addr laddr, faddr;
	181	u_short fport;
	182	int error = 0;
6d2010ae A	183	struct ip6_pktopts opt, *optp = NULL;
6d2010ae A	184	struct ip6_moptions *im6o;
9bccf70c A	185	int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
	186	int flags;
	187	struct sockaddr_in6 tmp;
91447636	188	struct in6_addr storage;
6d2010ae A	189	mbuf_traffic_class_t mtc = MBUF_TC_UNSPEC;
	190	struct ip6_out_args ip6oa = { IFSCOPE_NONE, 0 };
	191
	192	if (in6p->inp_flags & INP_BOUND_IF)
	193	ip6oa.ip6oa_boundif = in6p->inp_boundif;
9bccf70c	194
6d2010ae	195	ip6oa.ip6oa_nocell = (in6p->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;
b0d623f7	196
9bccf70c	197	if (control) {
d41d1dae	198	mtc = mbuf_traffic_class_from_control(control);
d41d1dae	199
6d2010ae	200	if ((error = ip6_setpktopts(control, &opt, NULL, IPPROTO_UDP)) != 0)
9bccf70c	201	goto release;
6d2010ae A	202	optp = &opt;
	203	} else
	204	optp = in6p->in6p_outputopts;
9bccf70c A	205
	206	if (addr6) {
	207	/*
	208	* IPv4 version of udp_output calls in_pcbconnect in this case,
	209	* which needs splnet and affects performance.
	210	* Since we saw no essential reason for calling in_pcbconnect,
	211	* we get rid of such kind of logic, and call in6_selectsrc
	212	* and in6_pcbsetport in order to fill in the local address
	213	* and the local port.
	214	*/
	215	struct sockaddr_in6 sin6 = (struct sockaddr_in6 )addr6;
	216	if (sin6->sin6_port == 0) {
	217	error = EADDRNOTAVAIL;
	218	goto release;
	219	}
	220
	221	if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
	222	/* how about ::ffff:0.0.0.0 case? */
	223	error = EISCONN;
	224	goto release;
	225	}
	226
	227	/* protect sin6 from overwrites /
	228	tmp = *sin6;
	229	sin6 = &tmp;
	230
	231	faddr = &sin6->sin6_addr;
	232	fport = sin6->sin6_port; /* allow 0 port */
	233
	234	if (IN6_IS_ADDR_V4MAPPED(faddr)) {
	235	if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
	236	/*
	237	* I believe we should explicitly discard the
	238	* packet when mapped addresses are disabled,
	239	* rather than send the packet as an IPv6 one.
	240	* If we chose the latter approach, the packet
	241	* might be sent out on the wire based on the
	242	* default route, the situation which we'd
	243	* probably want to avoid.
	244	* (20010421 jinmei@kame.net)
	245	*/
	246	error = EINVAL;
	247	goto release;
	248	} else
	249	af = AF_INET;
	250	}
	251
	252	/* KAME hack: embed scopeid */
6d2010ae A	253	if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL,
6d2010ae A	254	optp) != 0) {
9bccf70c A	255	error = EINVAL;
	256	goto release;
	257	}
	258
	259	if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
6d2010ae A	260	laddr = in6_selectsrc(sin6, optp,
	261	in6p, &in6p->in6p_route, NULL, &storage,
	262	ip6oa.ip6oa_boundif, &error);
9bccf70c A	263	} else
	264	laddr = &in6p->in6p_laddr; /* XXX */
	265	if (laddr == NULL) {
	266	if (error == 0)
	267	error = EADDRNOTAVAIL;
	268	goto release;
	269	}
	270	if (in6p->in6p_lport == 0 &&
91447636	271	(error = in6_pcbsetport(laddr, in6p, p, 0)) != 0)
9bccf70c A	272	goto release;
	273	} else {
	274	if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
	275	error = ENOTCONN;
	276	goto release;
	277	}
	278	if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
	279	if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
	280	/*
	281	* XXX: this case would happen when the
	282	* application sets the V6ONLY flag after
	283	* connecting the foreign address.
	284	* Such applications should be fixed,
	285	* so we bark here.
	286	*/
	287	log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
	288	"option was set for a connected socket\n");
	289	error = EINVAL;
	290	goto release;
	291	} else
	292	af = AF_INET;
	293	}
	294	laddr = &in6p->in6p_laddr;
	295	faddr = &in6p->in6p_faddr;
	296	fport = in6p->in6p_fport;
	297	}
	298
	299	if (af == AF_INET)
	300	hlen = sizeof(struct ip);
	301
	302	/*
	303	* Calculate data length and get a mbuf
	304	* for UDP and IP6 headers.
	305	*/
	306	M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
	307	if (m == 0) {
	308	error = ENOBUFS;
	309	goto release;
	310	}
	311
	312	/*
	313	* Stuff checksum and output datagram.
	314	*/
	315	udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
	316	udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
	317	udp6->uh_dport = fport;
	318	if (plen <= 0xffff)
	319	udp6->uh_ulen = htons((u_short)plen);
	320	else
	321	udp6->uh_ulen = 0;
	322	udp6->uh_sum = 0;
	323
	324	switch (af) {
	325	case AF_INET6:
	326	ip6 = mtod(m, struct ip6_hdr *);
	327	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
	328	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
	329	ip6->ip6_vfc \|= IPV6_VERSION;
	330	#if 0 /* ip6_plen will be filled in ip6_output. */
	331	ip6->ip6_plen = htons((u_short)plen);
	332	#endif
	333	ip6->ip6_nxt = IPPROTO_UDP;
	334	ip6->ip6_hlim = in6_selecthlim(in6p,
	335	in6p->in6p_route.ro_rt ?
336	in6p->in6p_route.ro_rt->rt_ifp : NULL);
337	ip6->ip6_src = *laddr;
338	ip6->ip6_dst = *faddr;
339
6d2010ae A	340	udp6->uh_sum = in6_cksum_phdr(laddr, faddr,
	341	htonl(plen), htonl(IPPROTO_UDP));
	342	m->m_pkthdr.csum_flags = CSUM_UDPIPV6;
	343	m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
9bccf70c	344
6d2010ae	345	flags = IPV6_OUTARGS;
9bccf70c A	346
	347	udp6stat.udp6s_opackets++;
	348	#ifdef IPSEC
	349	if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
	350	error = ENOBUFS;
	351	goto release;
	352	}
	353	#endif /IPSEC/
91447636	354	m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket);
6d2010ae A	355
	356	set_packet_tclass(m, in6p->in6p_socket, mtc, 1);
	357
	358	im6o = in6p->in6p_moptions;
	359	if (im6o != NULL)
	360	IM6O_ADDREF(im6o);
	361
	362	error = ip6_output(m, optp, &in6p->in6p_route,
	363	flags, im6o, NULL, &ip6oa);
	364
	365	if (im6o != NULL)
	366	IM6O_REMREF(im6o);
d41d1dae	367
6d2010ae A	368	if (error == 0 && nstat_collect) {
	369	locked_add_64(&in6p->inp_stat->txpackets, 1);
	370	locked_add_64(&in6p->inp_stat->txbytes, ulen);
	371	}
d1ecb069	372
6d2010ae A	373	if (in6p->in6p_route.ro_rt != NULL) {
	374	struct rtentry *rt = in6p->in6p_route.ro_rt;
	375	unsigned int outif;
	376
	377	if ((rt->rt_flags & RTF_MULTICAST) \|\|
	378	in6p->in6p_socket == NULL \|\|
	379	!(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
	380	rt = NULL; /* unusable */
	381	}
	382	/*
	383	* Always discard the cached route for unconnected
	384	* socket or if it is a multicast route.
	385	*/
	386	if (rt == NULL) {
	387	rtfree(in6p->in6p_route.ro_rt);
	388	in6p->in6p_route.ro_rt = NULL;
	389	}
	390	/*
	391	* If this is a connected socket and the destination
	392	* route is not multicast, update outif with that of
	393	* the route interface index used by IP.
	394	*/
	395	if (rt != NULL && (outif = rt->rt_ifp->if_index) !=
	396	in6p->in6p_last_outif)
	397	in6p->in6p_last_outif = outif;
d1ecb069	398	}
9bccf70c A	399	break;
	400	case AF_INET:
	401	error = EAFNOSUPPORT;
	402	goto release;
	403	}
	404	goto releaseopt;
	405
	406	release:
	407	m_freem(m);
	408
	409	releaseopt:
	410	if (control) {
6d2010ae A	411	if (optp == &opt)
6d2010ae A	412	ip6_clearpktopts(optp, -1);
9bccf70c A	413	m_freem(control);
	414	}
	415	return(error);
	416	}