udp6_output.c

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

//==========================================================================
//
//      src/sys/netinet6/udp6_output.c
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD, 
// FreeBSD or other sources, and are covered by the appropriate
// copyright disclaimers included herein.
//
// Portions created by Red Hat are
// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================

/*	$KAME: udp6_output.c,v 1.54 2001/12/27 05:12:38 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 <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>
#if !(defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802))
#include <netinet6/in6_pcb.h>
#include <netinet6/udp6_var.h>
#endif
#include <netinet/icmp6.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/scope6_var.h>

#ifdef __OpenBSD__
#undef IPSEC
#else
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /* IPSEC */
#endif

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

#ifdef HAVE_NRL_INPCB
#define in6pcb		inpcb

#define udp6stat	udpstat
#define udp6s_opackets	udps_opackets
#endif
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
#define in6pcb		inpcb
#define udp6stat	udpstat
#define udp6s_opackets	udps_opackets
#endif

#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
int
udp6_output(in6p, m, addr6, control, p)
	struct in6pcb *in6p;
	struct mbuf *m;
	struct mbuf *control;
	struct sockaddr *addr6;
	struct proc *p;
#elif defined(__NetBSD__)
int
udp6_output(in6p, m, addr6, control, p)
	struct in6pcb *in6p;
	struct mbuf *m;
	struct mbuf *addr6, *control;
	struct proc *p;
#else
int
udp6_output(in6p, m, addr6, control)
	struct in6pcb *in6p;
	struct mbuf *m;
	struct mbuf *addr6, *control;
#endif
{
	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);
#ifdef INET
#if defined(__NetBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
	struct ip *ip;
	struct udpiphdr *ui;
#endif
#endif
	int flags = 0;
	struct sockaddr_in6 tmp, *sin6 = NULL;

	priv = 1;

	if (addr6) {
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
		/* addr6 has been validated in udp6_send(). */
		sin6 = (struct sockaddr_in6 *)addr6;
#else
		sin6 = mtod(addr6, struct sockaddr_in6 *);

		if (addr6->m_len != sizeof(*sin6))
			return(EINVAL);

		if (sin6->sin6_family != AF_INET6)
			return(EAFNOSUPPORT);
#endif

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

		if ((error = scope6_check_id(sin6, ip6_use_defzone)) != 0)
			return(error);
	}

	if (control) {
		if ((error = ip6_setpktoptions(control, &opt, stickyopt, priv, 0)) != 0)
			goto release;
		in6p->in6p_outputopts = &opt;
	}

	if (sin6) {
		/*
		 * 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.
		 */
		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;
		}

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

		if (IN6_IS_ADDR_V4MAPPED(faddr)) {
#ifdef __OpenBSD__		/* does not support mapped addresses */
			if (1)
#else
			if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY))
#endif
			{
				/*
				 * 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 [e-mail])
				 */
				error = EINVAL;
				goto release;
			}
			if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)
			    && !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
				/*
				 * when remote addr is an IPv4-mapped address,