sync with kame tree as of july00. tons of bug fixes/improvements.

API changes:
- additional IPv6 ioctls
- IPsec PF_KEY API was changed, it is mandatory to upgrade setkey(8).
  (also syntax change)

1 files changed, 550 insertions, 0 deletions

diff --git a/sys/netinet6/in6_src.c b/sys/netinet6/in6_src.c
new file mode 100644
index 0000000..40b0df4
--- /dev/null
+++ b/sys/netinet6/in6_src.c
@@ -0,0 +1,550 @@
+/*	$FreeBSD$	*/
+/*	$KAME: in6_src.c,v 1.27 2000/06/21 08:07:13 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, 1991, 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.
+ *
+ *	@(#)in_pcb.c	8.2 (Berkeley) 1/4/94
+ */
+
+#include "opt_inet.h"
+#include "opt_inet6.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/in_pcb.h>
+#include <netinet6/in6_var.h>
+#include <netinet/ip6.h>
+#include <netinet6/in6_pcb.h>
+#include <netinet6/ip6_var.h>
+#include <netinet6/nd6.h>
+#ifdef ENABLE_DEFAULT_SCOPE
+#include <netinet6/scope6_var.h> 
+#endif
+
+#include <net/net_osdep.h>
+
+#include "loop.h"
+
+/*
+ * Return an IPv6 address, which is the most appropriate for given
+ * destination and user specified options.
+ * If necessary, this function lookups the routing table and return
+ * an entry to the caller for later use.
+ */
+struct in6_addr *
+in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
+	struct sockaddr_in6 *dstsock;
+	struct ip6_pktopts *opts;
+	struct ip6_moptions *mopts;
+	struct route_in6 *ro;
+	struct in6_addr *laddr;
+	int *errorp;
+{
+	struct in6_addr *dst;
+	struct in6_ifaddr *ia6 = 0;
+	struct in6_pktinfo *pi = NULL;
+
+	dst = &dstsock->sin6_addr;
+	*errorp = 0;
+
+	/*
+	 * If the source address is explicitly specified by the caller,
+	 * use it.
+	 */
+	if (opts && (pi = opts->ip6po_pktinfo) &&
+	    !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
+		return(&pi->ipi6_addr);
+
+	/*
+	 * If the source address is not specified but the socket(if any)
+	 * is already bound, use the bound address.
+	 */
+	if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
+		return(laddr);
+
+	/*
+	 * If the caller doesn't specify the source address but
+	 * the outgoing interface, use an address associated with
+	 * the interface.
+	 */
+	if (pi && pi->ipi6_ifindex) {
+		/* XXX boundary check is assumed to be already done. */
+		ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
+				       dst);
+		if (ia6 == 0) {
+			*errorp = EADDRNOTAVAIL;
+			return(0);
+		}
+		return(&satosin6(&ia6->ia_addr)->sin6_addr);
+	}
+
+	/*
+	 * If the destination address is a link-local unicast address or
+	 * a multicast address, and if the outgoing interface is specified
+	 * by the sin6_scope_id filed, use an address associated with the
+	 * interface.
+	 * XXX: We're now trying to define more specific semantics of
+	 *      sin6_scope_id field, so this part will be rewritten in
+	 *      the near future.
+	 */
+	if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
+	    dstsock->sin6_scope_id) {
+		/*
+		 * I'm not sure if boundary check for scope_id is done
+		 * somewhere...
+		 */
+		if (dstsock->sin6_scope_id < 0 ||
+		    if_index < dstsock->sin6_scope_id) {
+			*errorp = ENXIO; /* XXX: better error? */
+			return(0);
+		}
+		ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
+				       dst);
+		if (ia6 == 0) {
+			*errorp = EADDRNOTAVAIL;
+			return(0);
+		}
+		return(&satosin6(&ia6->ia_addr)->sin6_addr);
+	}
+
+	/*
+	 * If the destination address is a multicast address and
+	 * the outgoing interface for the address is specified
+	 * by the caller, use an address associated with the interface.
+	 * There is a sanity check here; if the destination has node-local
+	 * scope, the outgoing interfacde should be a loopback address.
+	 * Even if the outgoing interface is not specified, we also
+	 * choose a loopback interface as the outgoing interface.
+	 */
+	if (IN6_IS_ADDR_MULTICAST(dst)) {
+		struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
+
+		if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
+			ifp = &loif[0];
+		}
+
+		if (ifp) {
+			ia6 = in6_ifawithscope(ifp, dst);
+			if (ia6 == 0) {
+				*errorp = EADDRNOTAVAIL;
+				return(0);
+			}
+			return(&satosin6(&ia6->ia_addr)->sin6_addr);
+		}
+	}
+
+	/*
+	 * If the next hop address for the packet is specified
+	 * by caller, use an address associated with the route
+	 * to the next hop.
+	 */
+	{
+		struct sockaddr_in6 *sin6_next;
+		struct rtentry *rt;
+
+		if (opts && opts->ip6po_nexthop) {
+			sin6_next = satosin6(opts->ip6po_nexthop);
+			rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
+			if (rt) {
+				ia6 = in6_ifawithscope(rt->rt_ifp, dst);
+				if (ia6 == 0)
+					ia6 = ifatoia6(rt->rt_ifa);
+			}
+			if (ia6 == 0) {
+				*errorp = EADDRNOTAVAIL;
+				return(0);
+			}
+			return(&satosin6(&ia6->ia_addr)->sin6_addr);
+		}
+	}
+
+	/*
+	 * If route is known or can be allocated now,
+	 * our src addr is taken from the i/f, else punt.
+	 */
+	if (ro) {
+		if (ro->ro_rt &&
+		    !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
+			RTFREE(ro->ro_rt);
+			ro->ro_rt = (struct rtentry *)0;
+		}
+		if (ro->ro_rt == (struct rtentry *)0 ||
+		    ro->ro_rt->rt_ifp == (struct ifnet *)0) {
+			/* No route yet, so try to acquire one */
+			bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
+			ro->ro_dst.sin6_family = AF_INET6;
+			ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6);
+			ro->ro_dst.sin6_addr = *dst;
+			ro->ro_dst.sin6_scope_id = dstsock->sin6_scope_id;
+			if (IN6_IS_ADDR_MULTICAST(dst)) {
+				ro->ro_rt = rtalloc1(&((struct route *)ro)
+						     ->ro_dst, 0, 0UL);
+			} else {
+				rtalloc((struct route *)ro);
+			}
+		}
+
+		/*
+		 * in_pcbconnect() checks out IFF_LOOPBACK to skip using
+		 * the address. But we don't know why it does so.
+		 * It is necessary to ensure the scope even for lo0
+		 * so doesn't check out IFF_LOOPBACK.
+		 */
+
+		if (ro->ro_rt) {
+			ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
+			if (ia6 == 0) /* xxx scope error ?*/
+				ia6 = ifatoia6(ro->ro_rt->rt_ifa);
+		}
+#if 0
+		/*
+		 * xxx The followings are necessary? (kazu)
+		 * I don't think so.
+		 * It's for SO_DONTROUTE option in IPv4.(jinmei)
+		 */
+		if (ia6 == 0) {
+			struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0};
+
+			sin6->sin6_addr = *dst;
+
+			ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6)));
+			if (ia6 == 0)
+				ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6)));
+			if (ia6 == 0)
+				return(0);
+			return(&satosin6(&ia6->ia_addr)->sin6_addr);
+		}
+#endif /* 0 */
+		if (ia6 == 0) {
+			*errorp = EHOSTUNREACH;	/* no route */
+			return(0);
+		}
+		return(&satosin6(&ia6->ia_addr)->sin6_addr);
+	}
+
+	*errorp = EADDRNOTAVAIL;
+	return(0);
+}
+
+/*
+ * Default hop limit selection. The precedence is as follows:
+ * 1. Hoplimit value specified via ioctl.
+ * 2. (If the outgoing interface is detected) the current
+ *     hop limit of the interface specified by router advertisement.
+ * 3. The system default hoplimit.
+*/
+int
+in6_selecthlim(in6p, ifp)
+	struct in6pcb *in6p;
+	struct ifnet *ifp;
+{
+	if (in6p && in6p->in6p_hops >= 0)
+		return(in6p->in6p_hops);
+	else if (ifp)
+		return(nd_ifinfo[ifp->if_index].chlim);
+	else
+		return(ip6_defhlim);
+}
+
+/*
+ * XXX: this is borrowed from in6_pcbbind(). If possible, we should
+ * share this function by all *bsd*...
+ */
+int
+in6_pcbsetport(laddr, inp, p)
+	struct in6_addr *laddr;
+	struct inpcb *inp;
+	struct proc *p;
+{
+	struct socket *so = inp->inp_socket;
+	u_int16_t lport = 0, first, last, *lastport;
+	int count, error = 0, wild = 0;
+	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
+
+	/* XXX: this is redundant when called from in6_pcbbind */
+	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
+		wild = INPLOOKUP_WILDCARD;
+
+	inp->inp_flags |= INP_ANONPORT;
+
+	if (inp->inp_flags & INP_HIGHPORT) {
+		first = ipport_hifirstauto;	/* sysctl */
+		last  = ipport_hilastauto;
+		lastport = &pcbinfo->lasthi;
+	} else if (inp->inp_flags & INP_LOWPORT) {
+		if (p && (error = suser(p)))
+			return error;
+		first = ipport_lowfirstauto;	/* 1023 */
+		last  = ipport_lowlastauto;	/* 600 */
+		lastport = &pcbinfo->lastlow;
+	} else {
+		first = ipport_firstauto;	/* sysctl */
+		last  = ipport_lastauto;
+		lastport = &pcbinfo->lastport;
+	}
+	/*
+	 * Simple check to ensure all ports are not used up causing
+	 * a deadlock here.
+	 *
+	 * We split the two cases (up and down) so that the direction
+	 * is not being tested on each round of the loop.
+	 */
+	if (first > last) {
+		/*
+		 * counting down
+		 */
+		count = first - last;
+
+		do {
+			if (count-- < 0) {	/* completely used? */
+				/*
+				 * Undo any address bind that may have
+				 * occurred above.
+				 */
+				inp->in6p_laddr = in6addr_any;
+				return (EAGAIN);
+			}
+			--*lastport;
+			if (*lastport > first || *lastport < last)
+				*lastport = first;
+			lport = htons(*lastport);
+		} while (in6_pcblookup_local(pcbinfo,
+					     &inp->in6p_laddr, lport, wild));
+	} else {
+		/*
+			 * counting up
+			 */
+		count = last - first;
+
+		do {
+			if (count-- < 0) {	/* completely used? */
+				/*
+				 * Undo any address bind that may have
+				 * occurred above.
+				 */
+				inp->in6p_laddr = in6addr_any;
+				return (EAGAIN);
+			}
+			++*lastport;
+			if (*lastport < first || *lastport > last)
+				*lastport = first;
+			lport = htons(*lastport);
+		} while (in6_pcblookup_local(pcbinfo,
+					     &inp->in6p_laddr, lport, wild));
+	}
+
+	inp->inp_lport = lport;
+	if (in_pcbinshash(inp) != 0) {
+		inp->in6p_laddr = in6addr_any;
+		inp->inp_lport = 0;
+		return (EAGAIN);
+	}
+
+	return(0);
+}
+
+/*
+ * generate kernel-internal form (scopeid embedded into s6_addr16[1]).
+ * If the address scope of is link-local, embed the interface index in the
+ * address.  The routine determines our precedence
+ * between advanced API scope/interface specification and basic API
+ * specification.
+ *
+ * this function should be nuked in the future, when we get rid of
+ * embedded scopeid thing.
+ *
+ * XXX actually, it is over-specification to return ifp against sin6_scope_id.
+ * there can be multiple interfaces that belong to a particular scope zone
+ * (in specification, we have 1:N mapping between a scope zone and interfaces).
+ * we may want to change the function to return something other than ifp.
+ */
+int
+in6_embedscope(in6, sin6, in6p, ifpp)
+	struct in6_addr *in6;
+	const struct sockaddr_in6 *sin6;
+#ifdef HAVE_NRL_INPCB
+	struct inpcb *in6p;
+#define in6p_outputopts	inp_outputopts6
+#define in6p_moptions	inp_moptions6
+#else
+	struct in6pcb *in6p;
+#endif
+	struct ifnet **ifpp;
+{
+	struct ifnet *ifp = NULL;
+	u_int32_t scopeid;
+
+	*in6 = sin6->sin6_addr;
+	scopeid = sin6->sin6_scope_id;
+	if (ifpp)
+		*ifpp = NULL;
+
+	/*
+	 * don't try to read sin6->sin6_addr beyond here, since the caller may
+	 * ask us to overwrite existing sockaddr_in6
+	 */
+
+#ifdef ENABLE_DEFAULT_SCOPE
+	if (scopeid == 0)
+		scopeid = scope6_addr2default(in6);
+#endif
+
+	if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
+		struct in6_pktinfo *pi;
+
+		/*
+		 * KAME assumption: link id == interface id
+		 */
+
+		if (in6p && in6p->in6p_outputopts &&
+		    (pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
+		    pi->ipi6_ifindex) {
+			ifp = ifindex2ifnet[pi->ipi6_ifindex];
+			in6->s6_addr16[1] = htons(pi->ipi6_ifindex);
+		} else if (in6p && IN6_IS_ADDR_MULTICAST(in6) &&
+			   in6p->in6p_moptions &&
+			   in6p->in6p_moptions->im6o_multicast_ifp) {
+			ifp = in6p->in6p_moptions->im6o_multicast_ifp;
+			in6->s6_addr16[1] = htons(ifp->if_index);
+		} else if (scopeid) {
+			/* boundary check */
+			if (scopeid < 0 || if_index < scopeid)
+				return ENXIO;  /* XXX EINVAL? */
+			ifp = ifindex2ifnet[scopeid];
+			/*XXX assignment to 16bit from 32bit variable */
+			in6->s6_addr16[1] = htons(scopeid & 0xffff);
+		}
+
+		if (ifpp)
+			*ifpp = ifp;
+	}
+
+	return 0;
+}
+#ifdef HAVE_NRL_INPCB
+#undef in6p_outputopts
+#undef in6p_moptions
+#endif
+
+/*
+ * generate standard sockaddr_in6 from embedded form.
+ * touches sin6_addr and sin6_scope_id only.
+ *
+ * this function should be nuked in the future, when we get rid of
+ * embedded scopeid thing.
+ */
+int
+in6_recoverscope(sin6, in6, ifp)
+	struct sockaddr_in6 *sin6;
+	const struct in6_addr *in6;
+	struct ifnet *ifp;
+{
+	u_int32_t scopeid;
+
+	sin6->sin6_addr = *in6;
+
+	/*
+	 * don't try to read *in6 beyond here, since the caller may
+	 * ask us to overwrite existing sockaddr_in6
+	 */
+
+	sin6->sin6_scope_id = 0;
+	if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
+		/*
+		 * KAME assumption: link id == interface id
+		 */
+		scopeid = ntohs(sin6->sin6_addr.s6_addr16[1]);
+		if (scopeid) {
+			/* sanity check */
+			if (scopeid < 0 || if_index < scopeid)
+				return ENXIO;
+#ifndef FAKE_LOOPBACK_IF
+			if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
+			    ifp->if_index != scopeid) {
+				return ENXIO;
+			}
+#else
+			if (ifp && ifp->if_index != scopeid)
+				return ENXIO;
+#endif
+			sin6->sin6_addr.s6_addr16[1] = 0;
+			sin6->sin6_scope_id = scopeid;
+		}
+	}
+
+	return 0;
+}