Initial import

Code is based on FreeBSD 8.2 with USB support from Sebastian Huber
and Thomas Doerfler. Initial TCP/IP stack work is from Kevel Kirspel.

1 files changed, 1112 insertions, 0 deletions

diff --git a/rtems/freebsd/netinet6/udp6_usrreq.c b/rtems/freebsd/netinet6/udp6_usrreq.c
new file mode 100644
index 00000000..3ef55fd8
--- /dev/null
+++ b/rtems/freebsd/netinet6/udp6_usrreq.c
@@ -0,0 +1,1112 @@
+#include <rtems/freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * 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.
+ *
+ *	$KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
+ *	$KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
+ */
+
+/*-
+ * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
+ *	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.
+ * 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_usrreq.c	8.6 (Berkeley) 5/23/95
+ */
+
+#include <rtems/freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/freebsd/local/opt_inet.h>
+#include <rtems/freebsd/local/opt_inet6.h>
+#include <rtems/freebsd/local/opt_ipsec.h>
+
+#include <rtems/freebsd/sys/param.h>
+#include <rtems/freebsd/sys/jail.h>
+#include <rtems/freebsd/sys/kernel.h>
+#include <rtems/freebsd/sys/lock.h>
+#include <rtems/freebsd/sys/mbuf.h>
+#include <rtems/freebsd/sys/priv.h>
+#include <rtems/freebsd/sys/proc.h>
+#include <rtems/freebsd/sys/protosw.h>
+#include <rtems/freebsd/sys/signalvar.h>
+#include <rtems/freebsd/sys/socket.h>
+#include <rtems/freebsd/sys/socketvar.h>
+#include <rtems/freebsd/sys/sx.h>
+#include <rtems/freebsd/sys/sysctl.h>
+#include <rtems/freebsd/sys/syslog.h>
+#include <rtems/freebsd/sys/systm.h>
+
+#include <rtems/freebsd/net/if.h>
+#include <rtems/freebsd/net/if_types.h>
+#include <rtems/freebsd/net/route.h>
+
+#include <rtems/freebsd/netinet/in.h>
+#include <rtems/freebsd/netinet/in_pcb.h>
+#include <rtems/freebsd/netinet/in_systm.h>
+#include <rtems/freebsd/netinet/in_var.h>
+#include <rtems/freebsd/netinet/ip.h>
+#include <rtems/freebsd/netinet/ip_icmp.h>
+#include <rtems/freebsd/netinet/ip6.h>
+#include <rtems/freebsd/netinet/icmp_var.h>
+#include <rtems/freebsd/netinet/icmp6.h>
+#include <rtems/freebsd/netinet/ip_var.h>
+#include <rtems/freebsd/netinet/udp.h>
+#include <rtems/freebsd/netinet/udp_var.h>
+
+#include <rtems/freebsd/netinet6/ip6protosw.h>
+#include <rtems/freebsd/netinet6/ip6_var.h>
+#include <rtems/freebsd/netinet6/in6_pcb.h>
+#include <rtems/freebsd/netinet6/udp6_var.h>
+#include <rtems/freebsd/netinet6/scope6_var.h>
+
+#ifdef IPSEC
+#include <rtems/freebsd/netipsec/ipsec.h>
+#include <rtems/freebsd/netipsec/ipsec6.h>
+#endif /* IPSEC */
+
+#include <rtems/freebsd/security/mac/mac_framework.h>
+
+/*
+ * UDP protocol implementation.
+ * Per RFC 768, August, 1980.
+ */
+
+extern struct protosw	inetsw[];
+static void		udp6_detach(struct socket *so);
+
+static void
+udp6_append(struct inpcb *inp, struct mbuf *n, int off,
+    struct sockaddr_in6 *fromsa)
+{
+	struct socket *so;
+	struct mbuf *opts;
+
+	INP_LOCK_ASSERT(inp);
+
+#ifdef IPSEC
+	/* Check AH/ESP integrity. */
+	if (ipsec6_in_reject(n, inp)) {
+		m_freem(n);
+		V_ipsec6stat.in_polvio++;
+		return;
+	}
+#endif /* IPSEC */
+#ifdef MAC
+	if (mac_inpcb_check_deliver(inp, n) != 0) {
+		m_freem(n);
+		return;
+	}
+#endif
+	opts = NULL;
+	if (inp->inp_flags & INP_CONTROLOPTS ||
+	    inp->inp_socket->so_options & SO_TIMESTAMP)
+		ip6_savecontrol(inp, n, &opts);
+	m_adj(n, off + sizeof(struct udphdr));
+
+	so = inp->inp_socket;
+	SOCKBUF_LOCK(&so->so_rcv);
+	if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
+	    opts) == 0) {
+		SOCKBUF_UNLOCK(&so->so_rcv);
+		m_freem(n);
+		if (opts)
+			m_freem(opts);
+		UDPSTAT_INC(udps_fullsock);
+	} else
+		sorwakeup_locked(so);
+}
+
+int
+udp6_input(struct mbuf **mp, int *offp, int proto)
+{
+	struct mbuf *m = *mp;
+	struct ifnet *ifp;
+	struct ip6_hdr *ip6;
+	struct udphdr *uh;
+	struct inpcb *inp;
+	struct udpcb *up;
+	int off = *offp;
+	int plen, ulen;
+	struct sockaddr_in6 fromsa;
+
+	ifp = m->m_pkthdr.rcvif;
+	ip6 = mtod(m, struct ip6_hdr *);
+
+	if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
+		/* XXX send icmp6 host/port unreach? */
+		m_freem(m);
+		return (IPPROTO_DONE);
+	}
+
+#ifndef PULLDOWN_TEST
+	IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
+	ip6 = mtod(m, struct ip6_hdr *);
+	uh = (struct udphdr *)((caddr_t)ip6 + off);
+#else
+	IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
+	if (!uh)
+		return (IPPROTO_DONE);
+#endif
+
+	UDPSTAT_INC(udps_ipackets);
+
+	/*
+	 * Destination port of 0 is illegal, based on RFC768.
+	 */
+	if (uh->uh_dport == 0)
+		goto badunlocked;
+
+	plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
+	ulen = ntohs((u_short)uh->uh_ulen);
+
+	if (plen != ulen) {
+		UDPSTAT_INC(udps_badlen);
+		goto badunlocked;
+	}
+
+	/*
+	 * Checksum extended UDP header and data.
+	 */
+	if (uh->uh_sum == 0) {
+		UDPSTAT_INC(udps_nosum);
+		goto badunlocked;
+	}
+	if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
+		UDPSTAT_INC(udps_badsum);
+		goto badunlocked;
+	}
+
+	/*
+	 * Construct sockaddr format source address.
+	 */
+	init_sin6(&fromsa, m);
+	fromsa.sin6_port = uh->uh_sport;
+
+	INP_INFO_RLOCK(&V_udbinfo);
+	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+		struct inpcb *last;
+		struct ip6_moptions *imo;
+
+		/*
+		 * In the event that laddr should be set to the link-local
+		 * address (this happens in RIPng), the multicast address
+		 * specified in the received packet will not match laddr.  To
+		 * handle this situation, matching is relaxed if the
+		 * receiving interface is the same as one specified in the
+		 * socket and if the destination multicast address matches
+		 * one of the multicast groups specified in the socket.
+		 */
+
+		/*
+		 * KAME note: traditionally we dropped udpiphdr from mbuf
+		 * here.  We need udphdr for IPsec processing so we do that
+		 * later.
+		 */
+		last = NULL;
+		LIST_FOREACH(inp, &V_udb, inp_list) {
+			if ((inp->inp_vflag & INP_IPV6) == 0)
+				continue;
+			if (inp->inp_lport != uh->uh_dport)
+				continue;
+			if (inp->inp_fport != 0 &&
+			    inp->inp_fport != uh->uh_sport)
+				continue;
+			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
+				if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
+							&ip6->ip6_dst))
+					continue;
+			}
+			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+				if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
+							&ip6->ip6_src) ||
+				    inp->inp_fport != uh->uh_sport)
+					continue;
+			}
+
+			/*
+			 * Handle socket delivery policy for any-source
+			 * and source-specific multicast. [RFC3678]
+			 */
+			imo = inp->in6p_moptions;
+			if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+				struct sockaddr_in6	 mcaddr;
+				int			 blocked;
+
+				INP_RLOCK(inp);
+
+				bzero(&mcaddr, sizeof(struct sockaddr_in6));
+				mcaddr.sin6_len = sizeof(struct sockaddr_in6);
+				mcaddr.sin6_family = AF_INET6;
+				mcaddr.sin6_addr = ip6->ip6_dst;
+
+				blocked = im6o_mc_filter(imo, ifp,
+					(struct sockaddr *)&mcaddr,
+					(struct sockaddr *)&fromsa);
+				if (blocked != MCAST_PASS) {
+					if (blocked == MCAST_NOTGMEMBER)
+						IP6STAT_INC(ip6s_notmember);
+					if (blocked == MCAST_NOTSMEMBER ||
+					    blocked == MCAST_MUTED)
+						UDPSTAT_INC(udps_filtermcast);
+					INP_RUNLOCK(inp); /* XXX */
+					continue;
+				}
+
+				INP_RUNLOCK(inp);
+			}
+			if (last != NULL) {
+				struct mbuf *n;
+
+				if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
+					INP_RLOCK(last);
+					up = intoudpcb(last);
+					if (up->u_tun_func == NULL) {
+						udp6_append(last, n, off, &fromsa);
+					} else {
+						/*
+						 * Engage the tunneling
+						 * protocol we will have to
+						 * leave the info_lock up,
+						 * since we are hunting
+						 * through multiple UDP's.
+						 * 
+						 */
+						(*up->u_tun_func)(n, off, last);
+					}
+					INP_RUNLOCK(last);
+				}
+			}
+			last = inp;
+			/*
+			 * Don't look for additional matches if this one does
+			 * not have either the SO_REUSEPORT or SO_REUSEADDR
+			 * socket options set.  This heuristic avoids
+			 * searching through all pcbs in the common case of a
+			 * non-shared port.  It assumes that an application
+			 * will never clear these options after setting them.
+			 */
+			if ((last->inp_socket->so_options &
+			     (SO_REUSEPORT|SO_REUSEADDR)) == 0)
+				break;
+		}
+
+		if (last == NULL) {
+			/*
+			 * No matching pcb found; discard datagram.  (No need
+			 * to send an ICMP Port Unreachable for a broadcast
+			 * or multicast datgram.)
+			 */
+			UDPSTAT_INC(udps_noport);
+			UDPSTAT_INC(udps_noportmcast);
+			goto badheadlocked;
+		}
+		INP_RLOCK(last);
+		INP_INFO_RUNLOCK(&V_udbinfo);
+		up = intoudpcb(last);
+		if (up->u_tun_func == NULL) {
+			udp6_append(last, m, off, &fromsa);
+		} else {
+			/*
+			 * Engage the tunneling protocol.
+			 */
+			(*up->u_tun_func)(m, off, last);
+		}
+		INP_RUNLOCK(last);
+		return (IPPROTO_DONE);
+	}
+	/*
+	 * Locate pcb for datagram.
+	 */
+	inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport,
+	    &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
+	if (inp == NULL) {
+		if (udp_log_in_vain) {
+			char ip6bufs[INET6_ADDRSTRLEN];
+			char ip6bufd[INET6_ADDRSTRLEN];
+
+			log(LOG_INFO,
+			    "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
+			    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
+			    ntohs(uh->uh_dport),
+			    ip6_sprintf(ip6bufs, &ip6->ip6_src),
+			    ntohs(uh->uh_sport));
+		}
+		UDPSTAT_INC(udps_noport);
+		if (m->m_flags & M_MCAST) {
+			printf("UDP6: M_MCAST is set in a unicast packet.\n");
+			UDPSTAT_INC(udps_noportmcast);
+			goto badheadlocked;
+		}
+		INP_INFO_RUNLOCK(&V_udbinfo);
+		if (V_udp_blackhole)
+			goto badunlocked;
+		if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
+			goto badunlocked;
+		icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
+		return (IPPROTO_DONE);
+	}
+	INP_RLOCK(inp);
+	INP_INFO_RUNLOCK(&V_udbinfo);
+	up = intoudpcb(inp);
+	if (up->u_tun_func == NULL) {
+		udp6_append(inp, m, off, &fromsa);
+	} else {
+		/*
+		 * Engage the tunneling protocol.
+		 */
+
+		(*up->u_tun_func)(m, off, inp);
+	}
+	INP_RUNLOCK(inp);
+	return (IPPROTO_DONE);
+
+badheadlocked:
+	INP_INFO_RUNLOCK(&V_udbinfo);
+badunlocked:
+	if (m)
+		m_freem(m);
+	return (IPPROTO_DONE);
+}
+
+void
+udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
+{
+	struct udphdr uh;
+	struct ip6_hdr *ip6;
+	struct mbuf *m;
+	int off = 0;
+	struct ip6ctlparam *ip6cp = NULL;
+	const struct sockaddr_in6 *sa6_src = NULL;
+	void *cmdarg;
+	struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
+	struct udp_portonly {
+		u_int16_t uh_sport;
+		u_int16_t uh_dport;
+	} *uhp;
+
+	if (sa->sa_family != AF_INET6 ||
+	    sa->sa_len != sizeof(struct sockaddr_in6))
+		return;
+
+	if ((unsigned)cmd >= PRC_NCMDS)
+		return;
+	if (PRC_IS_REDIRECT(cmd))
+		notify = in6_rtchange, d = NULL;
+	else if (cmd == PRC_HOSTDEAD)
+		d = NULL;
+	else if (inet6ctlerrmap[cmd] == 0)
+		return;
+
+	/* if the parameter is from icmp6, decode it. */
+	if (d != NULL) {
+		ip6cp = (struct ip6ctlparam *)d;
+		m = ip6cp->ip6c_m;
+		ip6 = ip6cp->ip6c_ip6;
+		off = ip6cp->ip6c_off;
+		cmdarg = ip6cp->ip6c_cmdarg;
+		sa6_src = ip6cp->ip6c_src;
+	} else {
+		m = NULL;
+		ip6 = NULL;
+		cmdarg = NULL;
+		sa6_src = &sa6_any;
+	}
+
+	if (ip6) {
+		/*
+		 * XXX: We assume that when IPV6 is non NULL,
+		 * M and OFF are valid.
+		 */
+
+		/* Check if we can safely examine src and dst ports. */
+		if (m->m_pkthdr.len < off + sizeof(*uhp))
+			return;
+
+		bzero(&uh, sizeof(uh));
+		m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
+
+		(void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
+		    (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
+		    cmdarg, notify);
+	} else
+		(void) in6_pcbnotify(&V_udbinfo, sa, 0,
+		    (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
+}
+
+static int
+udp6_getcred(SYSCTL_HANDLER_ARGS)
+{
+	struct xucred xuc;
+	struct sockaddr_in6 addrs[2];
+	struct inpcb *inp;
+	int error;
+
+	error = priv_check(req->td, PRIV_NETINET_GETCRED);
+	if (error)
+		return (error);
+
+	if (req->newlen != sizeof(addrs))
+		return (EINVAL);
+	if (req->oldlen != sizeof(struct xucred))
+		return (EINVAL);
+	error = SYSCTL_IN(req, addrs, sizeof(addrs));
+	if (error)
+		return (error);
+	if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
+	    (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
+		return (error);
+	}
+	INP_INFO_RLOCK(&V_udbinfo);
+	inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr,
+	    addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1,
+	    NULL);
+	if (inp != NULL) {
+		INP_RLOCK(inp);
+		INP_INFO_RUNLOCK(&V_udbinfo);
+		if (inp->inp_socket == NULL)
+			error = ENOENT;
+		if (error == 0)
+			error = cr_canseesocket(req->td->td_ucred,
+			    inp->inp_socket);
+		if (error == 0)
+			cru2x(inp->inp_cred, &xuc);
+		INP_RUNLOCK(inp);
+	} else {
+		INP_INFO_RUNLOCK(&V_udbinfo);
+		error = ENOENT;
+	}
+	if (error == 0)
+		error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
+	return (error);
+}
+
+SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
+    0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
+
+static int
+udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
+    struct mbuf *control, struct thread *td)
+{
+	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, in6a;
+	struct sockaddr_in6 *sin6 = NULL;
+	struct ifnet *oifp = NULL;
+	int scope_ambiguous = 0;
+	u_short fport;
+	int error = 0;
+	struct ip6_pktopts *optp, opt;
+	int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
+	int flags;
+	struct sockaddr_in6 tmp;
+
+	INP_WLOCK_ASSERT(inp);
+
+	if (addr6) {
+		/* addr6 has been validated in udp6_send(). */
+		sin6 = (struct sockaddr_in6 *)addr6;
+
+		/* protect *sin6 from overwrites */
+		tmp = *sin6;
+		sin6 = &tmp;
+
+		/*
+		 * Application should provide a proper zone ID or the use of
+		 * default zone IDs should be enabled.  Unfortunately, some
+		 * applications do not behave as it should, so we need a
+		 * workaround.  Even if an appropriate ID is not determined,
+		 * we'll see if we can determine the outgoing interface.  If we
+		 * can, determine the zone ID based on the interface below.
+		 */
+		if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
+			scope_ambiguous = 1;
+		if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
+			return (error);
+	}
+
+	if (control) {
+		if ((error = ip6_setpktopts(control, &opt,
+		    inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
+			goto release;
+		optp = &opt;
+	} else
+		optp = inp->in6p_outputopts;
+
+	if (sin6) {
+		faddr = &sin6->sin6_addr;
+
+		/*
+		 * 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(&inp->in6p_faddr)) {
+			/* how about ::ffff:0.0.0.0 case? */
+			error = EISCONN;
+			goto release;
+		}
+
+		fport = sin6->sin6_port; /* allow 0 port */
+
+		if (IN6_IS_ADDR_V4MAPPED(faddr)) {
+			if ((inp->inp_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;
+			}
+			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
+			    !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
+				/*
+				 * when remote addr is an IPv4-mapped address,
+				 * local addr should not be an IPv6 address,
+				 * since you cannot determine how to map IPv6
+				 * source address to IPv4.
+				 */
+				error = EINVAL;
+				goto release;
+			}
+
+			af = AF_INET;
+		}
+
+		if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
+			error = in6_selectsrc(sin6, optp, inp, NULL,
+			    td->td_ucred, &oifp, &in6a);
+			if (error)
+				goto release;
+			if (oifp && scope_ambiguous &&
+			    (error = in6_setscope(&sin6->sin6_addr,
+			    oifp, NULL))) {
+				goto release;
+			}
+			laddr = &in6a;
+		} else
+			laddr = &inp->in6p_laddr;	/* XXX */
+		if (laddr == NULL) {
+			if (error == 0)
+				error = EADDRNOTAVAIL;
+			goto release;
+		}
+		if (inp->inp_lport == 0 &&
+		    (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0)
+			goto release;
+	} else {
+		if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+			error = ENOTCONN;
+			goto release;
+		}
+		if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
+			if ((inp->inp_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 = &inp->in6p_laddr;
+		faddr = &inp->in6p_faddr;
+		fport = inp->inp_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 = inp->inp_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	= inp->inp_flow & 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(inp, 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;
+
+		UDPSTAT_INC(udps_opackets);
+		error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
+		    NULL, inp);
+		break;
+	case AF_INET:
+		error = EAFNOSUPPORT;
+		goto release;
+	}
+	goto releaseopt;
+
+release:
+	m_freem(m);
+
+releaseopt:
+	if (control) {
+		ip6_clearpktopts(&opt, -1);
+		m_freem(control);
+	}
+	return (error);
+}
+
+static void
+udp6_abort(struct socket *so)
+{
+	struct inpcb *inp;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
+
+#ifdef INET
+	if (inp->inp_vflag & INP_IPV4) {
+		struct pr_usrreqs *pru;
+
+		pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
+		(*pru->pru_abort)(so);
+		return;
+	}
+#endif
+
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+		in6_pcbdisconnect(inp);
+		inp->in6p_laddr = in6addr_any;
+		soisdisconnected(so);
+	}
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+}
+
+static int
+udp6_attach(struct socket *so, int proto, struct thread *td)
+{
+	struct inpcb *inp;
+	int error;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
+
+	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+		error = soreserve(so, udp_sendspace, udp_recvspace);
+		if (error)
+			return (error);
+	}
+	INP_INFO_WLOCK(&V_udbinfo);
+	error = in_pcballoc(so, &V_udbinfo);
+	if (error) {
+		INP_INFO_WUNLOCK(&V_udbinfo);
+		return (error);
+	}
+	inp = (struct inpcb *)so->so_pcb;
+	inp->inp_vflag |= INP_IPV6;
+	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
+		inp->inp_vflag |= INP_IPV4;
+	inp->in6p_hops = -1;	/* use kernel default */
+	inp->in6p_cksum = -1;	/* just to be sure */
+	/*
+	 * XXX: ugly!!
+	 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
+	 * because the socket may be bound to an IPv6 wildcard address,
+	 * which may match an IPv4-mapped IPv6 address.
+	 */
+	inp->inp_ip_ttl = V_ip_defttl;
+
+	error = udp_newudpcb(inp);
+	if (error) {
+		in_pcbdetach(inp);
+		in_pcbfree(inp);
+		INP_INFO_WUNLOCK(&V_udbinfo);
+		return (error);
+	}
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	return (0);
+}
+
+static int
+udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	struct inpcb *inp;
+	int error;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+	inp->inp_vflag &= ~INP_IPV4;
+	inp->inp_vflag |= INP_IPV6;
+	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
+		struct sockaddr_in6 *sin6_p;
+
+		sin6_p = (struct sockaddr_in6 *)nam;
+
+		if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
+			inp->inp_vflag |= INP_IPV4;
+		else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
+			struct sockaddr_in sin;
+
+			in6_sin6_2_sin(&sin, sin6_p);
+			inp->inp_vflag |= INP_IPV4;
+			inp->inp_vflag &= ~INP_IPV6;
+			error = in_pcbbind(inp, (struct sockaddr *)&sin,
+			    td->td_ucred);
+			goto out;
+		}
+	}
+
+	error = in6_pcbbind(inp, nam, td->td_ucred);
+out:
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	return (error);
+}
+
+static void
+udp6_close(struct socket *so)
+{
+	struct inpcb *inp;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
+
+#ifdef INET
+	if (inp->inp_vflag & INP_IPV4) {
+		struct pr_usrreqs *pru;
+
+		pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
+		(*pru->pru_disconnect)(so);
+		return;
+	}
+#endif
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+		in6_pcbdisconnect(inp);
+		inp->in6p_laddr = in6addr_any;
+		soisdisconnected(so);
+	}
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+}
+
+static int
+udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	struct inpcb *inp;
+	struct sockaddr_in6 *sin6;
+	int error;
+
+	inp = sotoinpcb(so);
+	sin6 = (struct sockaddr_in6 *)nam;
+	KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
+	    IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+		struct sockaddr_in sin;
+
+		if (inp->inp_faddr.s_addr != INADDR_ANY) {
+			error = EISCONN;
+			goto out;
+		}
+		in6_sin6_2_sin(&sin, sin6);
+		error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
+		if (error != 0)
+			goto out;
+		error = in_pcbconnect(inp, (struct sockaddr *)&sin,
+		    td->td_ucred);
+		if (error == 0) {
+			inp->inp_vflag |= INP_IPV4;
+			inp->inp_vflag &= ~INP_IPV6;
+			soisconnected(so);
+		}
+		goto out;
+	}
+	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+		error = EISCONN;
+		goto out;
+	}
+	error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
+	if (error != 0)
+		goto out;
+	error = in6_pcbconnect(inp, nam, td->td_ucred);
+	if (error == 0) {
+		if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
+			/* should be non mapped addr */
+			inp->inp_vflag &= ~INP_IPV4;
+			inp->inp_vflag |= INP_IPV6;
+		}
+		soisconnected(so);
+	}
+out:
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	return (error);
+}
+
+static void
+udp6_detach(struct socket *so)
+{
+	struct inpcb *inp;
+	struct udpcb *up;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+	up = intoudpcb(inp);
+	KASSERT(up != NULL, ("%s: up == NULL", __func__));
+	in_pcbdetach(inp);
+	in_pcbfree(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	udp_discardcb(up);
+}
+
+static int
+udp6_disconnect(struct socket *so)
+{
+	struct inpcb *inp;
+	int error;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+
+#ifdef INET
+	if (inp->inp_vflag & INP_IPV4) {
+		struct pr_usrreqs *pru;
+
+		pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
+		error = (*pru->pru_disconnect)(so);
+		goto out;
+	}
+#endif
+
+	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+		error = ENOTCONN;
+		goto out;
+	}
+
+	in6_pcbdisconnect(inp);
+	inp->in6p_laddr = in6addr_any;
+	SOCK_LOCK(so);
+	so->so_state &= ~SS_ISCONNECTED;		/* XXX */
+	SOCK_UNLOCK(so);
+out:
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	return (0);
+}
+
+static int
+udp6_send(struct socket *so, int flags, struct mbuf *m,
+    struct sockaddr *addr, struct mbuf *control, struct thread *td)
+{
+	struct inpcb *inp;
+	int error = 0;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_udbinfo);
+	INP_WLOCK(inp);
+	if (addr) {
+		if (addr->sa_len != sizeof(struct sockaddr_in6)) {
+			error = EINVAL;
+			goto bad;
+		}
+		if (addr->sa_family != AF_INET6) {
+			error = EAFNOSUPPORT;
+			goto bad;
+		}
+	}
+
+#ifdef INET
+	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
+		int hasv4addr;
+		struct sockaddr_in6 *sin6 = 0;
+
+		if (addr == 0)
+			hasv4addr = (inp->inp_vflag & INP_IPV4);
+		else {
+			sin6 = (struct sockaddr_in6 *)addr;
+			hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
+			    ? 1 : 0;
+		}
+		if (hasv4addr) {
+			struct pr_usrreqs *pru;
+
+			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
+			    !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
+				/*
+				 * When remote addr is IPv4-mapped address,
+				 * local addr should not be an IPv6 address;
+				 * since you cannot determine how to map IPv6
+				 * source address to IPv4.
+				 */
+				error = EINVAL;
+				goto out;
+			}
+
+			/*
+			 * XXXRW: We release UDP-layer locks before calling
+			 * udp_send() in order to avoid recursion.  However,
+			 * this does mean there is a short window where inp's
+			 * fields are unstable.  Could this lead to a
+			 * potential race in which the factors causing us to
+			 * select the UDPv4 output routine are invalidated?
+			 */
+			INP_WUNLOCK(inp);
+			INP_INFO_WUNLOCK(&V_udbinfo);
+			if (sin6)
+				in6_sin6_2_sin_in_sock(addr);
+			pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
+			/* addr will just be freed in sendit(). */
+			return ((*pru->pru_send)(so, flags, m, addr, control,
+			    td));
+		}
+	}
+#endif
+#ifdef MAC
+	mac_inpcb_create_mbuf(inp, m);
+#endif
+	error = udp6_output(inp, m, addr, control, td);
+out:
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	return (error);
+
+bad:
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_udbinfo);
+	m_freem(m);
+	return (error);
+}
+
+struct pr_usrreqs udp6_usrreqs = {
+	.pru_abort =		udp6_abort,
+	.pru_attach =		udp6_attach,
+	.pru_bind =		udp6_bind,
+	.pru_connect =		udp6_connect,
+	.pru_control =		in6_control,
+	.pru_detach =		udp6_detach,
+	.pru_disconnect =	udp6_disconnect,
+	.pru_peeraddr =		in6_mapped_peeraddr,
+	.pru_send =		udp6_send,
+	.pru_shutdown =		udp_shutdown,
+	.pru_sockaddr =		in6_mapped_sockaddr,
+	.pru_soreceive =	soreceive_dgram,
+	.pru_sosend =		sosend_dgram,
+	.pru_sosetlabel =	in_pcbsosetlabel,
+	.pru_close =		udp6_close
+};