sync with KAME udp6_output(). udp output logic is very different between

IPv4/v6 so the separation should make more sense.

TODO: remove IPv6 case from udp_output()
TODO: remove/comment out/#if 0 IPv4 mapped address cases

2 files changed, 297 insertions, 2 deletions

diff --git a/sys/netinet6/in6_proto.c b/sys/netinet6/in6_proto.c
index d771bd67761..65424304f3d 100644
--- a/sys/netinet6/in6_proto.c
+++ b/sys/netinet6/in6_proto.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: in6_proto.c,v 1.21 2000/05/25 01:22:00 itojun Exp $	*/
+/*	$OpenBSD: in6_proto.c,v 1.22 2000/06/18 17:32:48 itojun Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -125,7 +125,7 @@ struct ip6protosw inet6sw[] = {
 },
 { SOCK_DGRAM,	&inet6domain,	IPPROTO_UDP,	PR_ATOMIC | PR_ADDR,
   udp6_input,	0,		udp6_ctlinput,	ip6_ctloutput,
- udp6_usrreq,	0,
+  udp6_usrreq,	0,
   0,		0,		0,
   udp_sysctl,
 },
diff --git a/sys/netinet6/udp6_output.c b/sys/netinet6/udp6_output.c
new file mode 100644
index 00000000000..1a2b5e5d853
--- /dev/null
+++ b/sys/netinet6/udp6_output.c
@@ -0,0 +1,295 @@
+/*	$KAME: udp6_output.c,v 1.14 2000/06/13 10:31:23 itojun 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/errno.h>
+#include <sys/stat.h>
+#include <sys/systm.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 <netinet/icmp6.h>
+#include <netinet6/ip6protosw.h>
+
+#undef IPSEC
+
+#include "faith.h"
+
+#include <net/net_osdep.h>
+
+/*
+ * UDP protocol inplementation.
+ * Per RFC 768, August, 1980.
+ */
+
+#define in6pcb		inpcb
+#define in6p_outputopts	inp_outputopts6
+#define in6p_socket	inp_socket
+#define in6p_faddr	inp_faddr6
+#define in6p_laddr	inp_laddr6
+#define in6p_fport	inp_fport
+#define in6p_lport	inp_lport
+#define in6p_flags	inp_flags
+#define in6p_moptions	inp_moptions6
+#define in6p_route	inp_route6
+#define in6p_flowinfo	inp_fflowinfo
+#define udp6stat	udpstat
+#define udp6s_opackets	udps_opackets
+
+int
+udp6_output(in6p, m, addr6, control)
+	register struct in6pcb *in6p;
+	register struct mbuf *m;
+	struct mbuf *addr6, *control;
+{
+	register 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;
+	int priv;
+	int af, hlen;
+	int flags;
+	struct sockaddr_in6 tmp;
+
+	priv = 0;
+	if ((in6p->in6p_socket->so_state & SS_PRIV) != 0)
+		priv = 1;
+	stickyopt = in6p->in6p_outputopts;
+	if (control) {
+		if ((error = ip6_setpktoptions(control, &opt, priv)) != 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 = mtod(addr6, struct sockaddr_in6 *);
+
+		if (addr6->m_len != sizeof(*sin6)) {
+			error = EINVAL;
+			goto release;
+		}
+		if (sin6->sin6_family != AF_INET6) {
+			error = EAFNOSUPPORT;
+			goto release;
+		}
+		if (sin6->sin6_port == 0) {
+			error = EADDRNOTAVAIL;
+			goto release;
+		}
+
+		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
+			error = EISCONN;
+			goto release;
+		}
+
+		/* protect *sin6 from overwrites */
+		tmp = *sin6;
+		sin6 = &tmp;
+
+		faddr = &sin6->sin6_addr;
+		fport = sin6->sin6_port; /* allow 0 port */
+
+		/* KAME hack: embed scopeid */
+		if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
+			error = EINVAL;
+			goto release;
+		}
+
+		if (1) {	/* we don't support IPv4 mapped address */
+			laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
+					      in6p->in6p_moptions,
+					      &in6p->in6p_route,
+					      &in6p->in6p_laddr, &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)) != 0)
+			goto release;
+	} else {
+		if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
+			error = ENOTCONN;
+			goto release;
+		}
+		laddr = &in6p->in6p_laddr;
+		faddr = &in6p->in6p_faddr;
+		fport = in6p->in6p_fport;
+	}
+
+	if (1) {	/* we don't support IPv4 mapped address */
+		af = AF_INET6;
+		hlen = sizeof(struct ip6_hdr);
+	} else {
+		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;
+#ifdef IPV6_MINMTU
+		if (in6p->in6p_flags & IN6P_MINMTU)
+			flags |= IPV6_MINMTU;
+#endif
+
+		udp6stat.udp6s_opackets++;
+#ifdef IPSEC
+		ipsec_setsocket(m, in6p->in6p_socket);
+#endif /*IPSEC*/
+		error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
+			    flags, in6p->in6p_moptions, NULL);
+		break;
+	case AF_INET:
+		error = EAFNOSUPPORT;
+		goto release;
+	}
+	goto releaseopt;
+
+release:
+	m_freem(m);
+
+releaseopt:
+	if (control) {
+		in6p->in6p_outputopts = stickyopt;
+		m_freem(control);
+	}
+	return(error);
+}