[apple/xnu.git] / bsd / netinet6 / in6_src.c

/*	$KAME: in6_src.c,v 1.10 2000/03/28 09:02:23 k-sugyou 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
 */

/* for MIP6 */
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#endif

#ifdef __NetBSD__
#include "opt_ipsec.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 4)
#include <sys/ioctl.h>
#endif
#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>
#if !(defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802))
#include <netinet6/in6_pcb.h>
#endif
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>

#include <net/net_osdep.h>

#ifndef __bsdi__
#include "loop.h"
#endif
#if defined(__NetBSD__) || defined(__OpenBSD__)
extern struct ifnet loif[NLOOP];
#endif

#if MIP6
#include <netinet6/mip6.h>
#include <netinet6/mip6_common.h>

extern struct nd_prefix *(*mip6_get_home_prefix_hook) __P((void));
#endif

/*
 * 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;
#ifdef __bsdi__
#if _BSDI_VERSION >= 199802
		extern struct ifnet *loifp;
#else
		extern struct ifnet loif;
		struct ifnet *loifp = &loif;
#endif
#endif

		if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
#ifdef __bsdi__
			ifp = loifp;
#else
			ifp = &loif[0];
#endif
		}

		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 MIP6
	/*
	 * This is needed to assure that the Home Address is used for
	 * outgoing packets when not at home. We can't choose any other
	 * address if we want to keep connections up during movement.
	 */
	if (mip6_get_home_prefix_hook) {	/* Only Mobile Node */
		struct nd_prefix *pr;
		if ((pr = (*mip6_get_home_prefix_hook)()) &&
		    !IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) {
			if (in6_addrscope(dst) ==
			    in6_addrscope(&pr->ndpr_addr)) {
#if MIP6_DEBUG
				/* Noisy but useful */
				mip6_debug("%s: Local address %s is chosen "
					   "for pcb to dest %s.\n",
					   __FUNCTION__,
					   ip6_sprintf(&pr->ndpr_addr),
					   ip6_sprintf(dst));
#endif
				return(&pr->ndpr_addr);
			}
		}
	}
#endif /* MIP6 */

	/*
	 * 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;
			if (IN6_IS_ADDR_MULTICAST(dst)) {
#if defined( __FreeBSD__) || defined (__APPLE__)
				ro->ro_rt = rtalloc1(&((struct route *)ro)
						     ->ro_dst, 0, 0UL);
#else
				ro->ro_rt = rtalloc1(&((struct route *)ro)
						     ->ro_dst, 0);
#endif /*__FreeBSD__*/
			} else {
#ifdef __bsdi__  /* bsdi needs rtcalloc to make a host route */
				rtcalloc((struct route *)ro);
#else
				rtalloc((struct route *)ro);
#endif
			}
		}

		/*
		 * 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.
*/
#if HAVE_NRL_INPCB
#define in6pcb		inpcb
#define in6p_hops	inp_hops	
#endif
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);
}
#if HAVE_NRL_INPCB
#undef in6pcb
#undef in6p_hops
#endif

#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__OpenBSD__) && !defined(__APPLE__)
/*
 * Find an empty port and set it to the specified PCB.
 */
#if HAVE_NRL_INPCB	/* XXX: I really hate such ugly macros...(jinmei) */
#define in6pcb		inpcb
#define in6p_socket	inp_socket
#define in6p_lport	inp_lport
#define in6p_head	inp_head
#define in6p_flags	inp_flags
#define IN6PLOOKUP_WILDCARD INPLOOKUP_WILDCARD
#endif
int
in6_pcbsetport(laddr, in6p)
	struct in6_addr *laddr;
	struct in6pcb *in6p;
{
	struct socket *so = in6p->in6p_socket;
	struct in6pcb *head = in6p->in6p_head;
	u_int16_t last_port, lport = 0;
	int wild = 0;
	void *t;
	u_int16_t min, max;
#ifdef __NetBSD__
	struct proc *p = curproc;		/* XXX */
#endif

	/* XXX: this is redundant when called from in6_pcbbind */
	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
	   ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
	    (so->so_options & SO_ACCEPTCONN) == 0))
		wild = IN6PLOOKUP_WILDCARD;

	if (in6p->in6p_flags & IN6P_LOWPORT) {
#ifdef __NetBSD__
		if (p == 0 || (suser(p->p_ucred, &p->p_acflag) != 0))
			return (EACCES);
#else
		if ((so->so_state & SS_PRIV) == 0)
			return (EACCES);
#endif
		min = IPV6PORT_RESERVEDMIN;
		max = IPV6PORT_RESERVEDMAX;
	} else {
		min = IPV6PORT_ANONMIN;
		max = IPV6PORT_ANONMAX;
	}

	/* value out of range */
	if (head->in6p_lport < min)
		head->in6p_lport = min;
	else if (head->in6p_lport > max)
		head->in6p_lport = min;
	last_port = head->in6p_lport;
	goto startover;	/*to randomize*/
	for (;;) {
		lport = htons(head->in6p_lport);
		if (IN6_IS_ADDR_V4MAPPED(laddr)) {
#if 0
			t = in_pcblookup_bind(&tcbtable,
					      (struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
					      lport);
#else
			t = NULL;
#endif
		} else {
#if HAVE_NRL_INPCB
			/* XXX: ugly cast... */
			t = in_pcblookup(head, (struct in_addr *)&zeroin6_addr,
					 0, (struct in_addr *)laddr,
					 lport, wild | INPLOOKUP_IPV6);
#else
			t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
					  lport, wild);
#endif
		}
		if (t == 0)
			break;
	  startover:
		if (head->in6p_lport >= max)
			head->in6p_lport = min;
		else
			head->in6p_lport++;
		if (head->in6p_lport == last_port)
			return (EADDRINUSE);
	}

	in6p->in6p_lport = lport;
	return(0);		/* success */
}
#if HAVE_NRL_INPCB
#undef in6pcb
#undef in6p_socket
#undef in6p_lport
#undef in6p_head
#undef in6p_flags
#undef IN6PLOOKUP_WILDCARD
#endif
#endif /* !FreeBSD3 && !OpenBSD*/
Commit	Line	Data
1c79356b A	1	/* $KAME: in6_src.c,v 1.10 2000/03/28 09:02:23 k-sugyou Exp $ */
	2
	3	/*
	4	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of the project nor the names of its contributors
	16	* may be used to endorse or promote products derived from this software
	17	* without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	* SUCH DAMAGE.
	30	*/
	31
	32	/*
	33	* Copyright (c) 1982, 1986, 1991, 1993
	34	* The Regents of the University of California. All rights reserved.
	35	*
	36	* Redistribution and use in source and binary forms, with or without
	37	* modification, are permitted provided that the following conditions
	38	* are met:
	39	* 1. Redistributions of source code must retain the above copyright
	40	* notice, this list of conditions and the following disclaimer.
	41	* 2. Redistributions in binary form must reproduce the above copyright
	42	* notice, this list of conditions and the following disclaimer in the
	43	* documentation and/or other materials provided with the distribution.
	44	* 3. All advertising materials mentioning features or use of this software
	45	* must display the following acknowledgement:
	46	* This product includes software developed by the University of
	47	* California, Berkeley and its contributors.
	48	* 4. Neither the name of the University nor the names of its contributors
	49	* may be used to endorse or promote products derived from this software
	50	* without specific prior written permission.
	51	*
	52	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	53	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	54	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	55	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	56	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	57	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	58	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	59	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	60	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	61	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	62	* SUCH DAMAGE.
	63	*
	64	* @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
65	*/
66
67	/* for MIP6 */
68	#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) \|\| defined(__NetBSD__)
69	#include "opt_inet.h"
70	#endif
71
72	#ifdef __NetBSD__
73	#include "opt_ipsec.h"
74	#endif
75
76	#include <sys/param.h>
77	#include <sys/systm.h>
78	#include <sys/malloc.h>
79	#include <sys/mbuf.h>
80	#include <sys/protosw.h>
81	#include <sys/socket.h>
82	#include <sys/socketvar.h>
83	#if !(defined(__FreeBSD__) && __FreeBSD__ >= 4)
84	#include <sys/ioctl.h>
85	#endif
86	#include <sys/errno.h>
87	#include <sys/time.h>
88	#include <sys/proc.h>
89
90	#include <net/if.h>
91	#include <net/route.h>
92
93	#include <netinet/in.h>
94	#include <netinet/in_var.h>
95	#include <netinet/in_systm.h>
96	#include <netinet/ip.h>
97	#include <netinet/in_pcb.h>
98	#include <netinet6/in6_var.h>
99	#include <netinet/ip6.h>
100	#if !(defined(__OpenBSD__) \|\| (defined(__bsdi__) && _BSDI_VERSION >= 199802))
101	#include <netinet6/in6_pcb.h>
102	#endif
103	#include <netinet6/ip6_var.h>
104	#include <netinet6/nd6.h>
105
106	#include <net/net_osdep.h>
107
108	#ifndef __bsdi__
109	#include "loop.h"
110	#endif
111	#if defined(__NetBSD__) \|\| defined(__OpenBSD__)
112	extern struct ifnet loif[NLOOP];
113	#endif
114
115	#if MIP6
116	#include <netinet6/mip6.h>
117	#include <netinet6/mip6_common.h>
118
119	extern struct nd_prefix (mip6_get_home_prefix_hook) __P((void));
120	#endif
121
122	/*
123	* Return an IPv6 address, which is the most appropriate for given
124	* destination and user specified options.
125	* If necessary, this function lookups the routing table and return
126	* an entry to the caller for later use.
127	*/
128	struct in6_addr *
129	in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
130	struct sockaddr_in6 *dstsock;
131	struct ip6_pktopts *opts;
132	struct ip6_moptions *mopts;
133	struct route_in6 *ro;
134	struct in6_addr *laddr;
135	int *errorp;
136	{
137	struct in6_addr *dst;
138	struct in6_ifaddr *ia6 = 0;
139	struct in6_pktinfo *pi = NULL;
140
141	dst = &dstsock->sin6_addr;
142	*errorp = 0;
143
144	/*
145	* If the source address is explicitly specified by the caller,
146	* use it.
147	*/
148	if (opts && (pi = opts->ip6po_pktinfo) &&
149	!IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
150	return(&pi->ipi6_addr);
151
152	/*
153	* If the source address is not specified but the socket(if any)
154	* is already bound, use the bound address.
155	*/
156	if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
157	return(laddr);
158
159	/*
160	* If the caller doesn't specify the source address but
161	* the outgoing interface, use an address associated with
162	* the interface.
163	*/
164	if (pi && pi->ipi6_ifindex) {
165	/* XXX boundary check is assumed to be already done. */
166	ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
167	dst);
168	if (ia6 == 0) {
169	*errorp = EADDRNOTAVAIL;
170	return(0);
171	}
172	return(&satosin6(&ia6->ia_addr)->sin6_addr);
173	}
174
175	/*
176	* If the destination address is a link-local unicast address or
177	* a multicast address, and if the outgoing interface is specified
178	* by the sin6_scope_id filed, use an address associated with the
179	* interface.
180	* XXX: We're now trying to define more specific semantics of
181	* sin6_scope_id field, so this part will be rewritten in
182	* the near future.
183	*/
184	if ((IN6_IS_ADDR_LINKLOCAL(dst) \|\| IN6_IS_ADDR_MULTICAST(dst)) &&
185	dstsock->sin6_scope_id) {
186	/*
187	* I'm not sure if boundary check for scope_id is done
188	* somewhere...
189	*/
190	if (dstsock->sin6_scope_id < 0 \|\|
191	if_index < dstsock->sin6_scope_id) {
192	errorp = ENXIO; / XXX: better error? */
193	return(0);
194	}
195	ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
196	dst);
197	if (ia6 == 0) {
198	*errorp = EADDRNOTAVAIL;
199	return(0);
200	}
201	return(&satosin6(&ia6->ia_addr)->sin6_addr);
202	}
203
204	/*
205	* If the destination address is a multicast address and
206	* the outgoing interface for the address is specified
207	* by the caller, use an address associated with the interface.
208	* There is a sanity check here; if the destination has node-local
209	* scope, the outgoing interfacde should be a loopback address.
210	* Even if the outgoing interface is not specified, we also
211	* choose a loopback interface as the outgoing interface.
212	*/
213	if (IN6_IS_ADDR_MULTICAST(dst)) {
214	struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
215	#ifdef __bsdi__
216	#if _BSDI_VERSION >= 199802
217	extern struct ifnet *loifp;
218	#else
219	extern struct ifnet loif;
220	struct ifnet *loifp = &loif;
221	#endif
222	#endif
223
224	if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
225	#ifdef __bsdi__
226	ifp = loifp;
227	#else
228	ifp = &loif[0];
229	#endif
230	}
231
232	if (ifp) {
233	ia6 = in6_ifawithscope(ifp, dst);
234	if (ia6 == 0) {
235	*errorp = EADDRNOTAVAIL;
236	return(0);
237	}
238	return(&satosin6(&ia6->ia_addr)->sin6_addr);
239	}
240	}
241
242	/*
243	* If the next hop address for the packet is specified
244	* by caller, use an address associated with the route
245	* to the next hop.
246	*/
247	{
248	struct sockaddr_in6 *sin6_next;
249	struct rtentry *rt;
250
251	if (opts && opts->ip6po_nexthop) {
252	sin6_next = satosin6(opts->ip6po_nexthop);
253	rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
254	if (rt) {
255	ia6 = in6_ifawithscope(rt->rt_ifp, dst);
256	if (ia6 == 0)
257	ia6 = ifatoia6(rt->rt_ifa);
258	}
259	if (ia6 == 0) {
260	*errorp = EADDRNOTAVAIL;
261	return(0);
262	}
263	return(&satosin6(&ia6->ia_addr)->sin6_addr);
264	}
265	}
266
267	#if MIP6
268	/*
269	* This is needed to assure that the Home Address is used for
270	* outgoing packets when not at home. We can't choose any other
271	* address if we want to keep connections up during movement.
272	*/
273	if (mip6_get_home_prefix_hook) { /* Only Mobile Node */
274	struct nd_prefix *pr;
275	if ((pr = (*mip6_get_home_prefix_hook)()) &&
276	!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) {
277	if (in6_addrscope(dst) ==
278	in6_addrscope(&pr->ndpr_addr)) {
279	#if MIP6_DEBUG
280	/* Noisy but useful */
281	mip6_debug("%s: Local address %s is chosen "
282	"for pcb to dest %s.\n",
283	__FUNCTION__,
284	ip6_sprintf(&pr->ndpr_addr),
285	ip6_sprintf(dst));
286	#endif
287	return(&pr->ndpr_addr);
288	}
289	}
290	}
291	#endif /* MIP6 */
292
293	/*
294	* If route is known or can be allocated now,
295	* our src addr is taken from the i/f, else punt.
296	*/
297	if (ro) {
298	if (ro->ro_rt &&
299	!IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
300	RTFREE(ro->ro_rt);
301	ro->ro_rt = (struct rtentry *)0;
302	}
303	if (ro->ro_rt == (struct rtentry *)0 \|\|
304	ro->ro_rt->rt_ifp == (struct ifnet *)0) {
305	/* No route yet, so try to acquire one */
306	bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
307	ro->ro_dst.sin6_family = AF_INET6;
308	ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6);
309	ro->ro_dst.sin6_addr = *dst;
310	if (IN6_IS_ADDR_MULTICAST(dst)) {
311	#if defined( __FreeBSD__) \|\| defined (__APPLE__)
312	ro->ro_rt = rtalloc1(&((struct route *)ro)
313	->ro_dst, 0, 0UL);
314	#else
315	ro->ro_rt = rtalloc1(&((struct route *)ro)
316	->ro_dst, 0);
317	#endif /__FreeBSD__/
318	} else {
319	#ifdef __bsdi__ /* bsdi needs rtcalloc to make a host route */
320	rtcalloc((struct route *)ro);
321	#else
322	rtalloc((struct route *)ro);
323	#endif
324	}
325	}
326
327	/*
328	* in_pcbconnect() checks out IFF_LOOPBACK to skip using
329	* the address. But we don't know why it does so.
330	* It is necessary to ensure the scope even for lo0
331	* so doesn't check out IFF_LOOPBACK.
332	*/
333
334	if (ro->ro_rt) {
335	ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
336	if (ia6 == 0) /* xxx scope error ?*/
337	ia6 = ifatoia6(ro->ro_rt->rt_ifa);
338	}
339	#if 0
340	/*
341	* xxx The followings are necessary? (kazu)
342	* I don't think so.
343	* It's for SO_DONTROUTE option in IPv4.(jinmei)
344	*/
345	if (ia6 == 0) {
346	struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0};
347
348	sin6->sin6_addr = *dst;
349
350	ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6)));
351	if (ia6 == 0)
352	ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6)));
353	if (ia6 == 0)
354	return(0);
355	return(&satosin6(&ia6->ia_addr)->sin6_addr);
356	}
357	#endif /* 0 */
358	if (ia6 == 0) {
359	errorp = EHOSTUNREACH; / no route */
360	return(0);
361	}
362	return(&satosin6(&ia6->ia_addr)->sin6_addr);
363	}
364
365	*errorp = EADDRNOTAVAIL;
366	return(0);
367	}
368
369	/*
370	* Default hop limit selection. The precedence is as follows:
371	* 1. Hoplimit value specified via ioctl.
372	* 2. (If the outgoing interface is detected) the current
373	* hop limit of the interface specified by router advertisement.
374	* 3. The system default hoplimit.
375	*/
376	#if HAVE_NRL_INPCB
377	#define in6pcb inpcb
378	#define in6p_hops inp_hops
379	#endif
380	int
381	in6_selecthlim(in6p, ifp)
382	struct in6pcb *in6p;
383	struct ifnet *ifp;
384	{
385	if (in6p && in6p->in6p_hops >= 0)
386	return(in6p->in6p_hops);
387	else if (ifp)
388	return(nd_ifinfo[ifp->if_index].chlim);
389	else
390	return(ip6_defhlim);
391	}
392	#if HAVE_NRL_INPCB
393	#undef in6pcb
394	#undef in6p_hops
395	#endif
396
397	#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__OpenBSD__) && !defined(__APPLE__)
398	/*
399	* Find an empty port and set it to the specified PCB.
400	*/
401	#if HAVE_NRL_INPCB /* XXX: I really hate such ugly macros...(jinmei) */
402	#define in6pcb inpcb
403	#define in6p_socket inp_socket
404	#define in6p_lport inp_lport
405	#define in6p_head inp_head
406	#define in6p_flags inp_flags
407	#define IN6PLOOKUP_WILDCARD INPLOOKUP_WILDCARD
408	#endif
409	int
410	in6_pcbsetport(laddr, in6p)
411	struct in6_addr *laddr;
412	struct in6pcb *in6p;
413	{
414	struct socket *so = in6p->in6p_socket;
415	struct in6pcb *head = in6p->in6p_head;
416	u_int16_t last_port, lport = 0;
417	int wild = 0;
418	void *t;
419	u_int16_t min, max;
420	#ifdef __NetBSD__
421	struct proc p = curproc; / XXX */
422	#endif
423
424	/* XXX: this is redundant when called from in6_pcbbind */
425	if ((so->so_options & (SO_REUSEADDR\|SO_REUSEPORT)) == 0 &&
426	((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 \|\|
427	(so->so_options & SO_ACCEPTCONN) == 0))
428	wild = IN6PLOOKUP_WILDCARD;
429
430	if (in6p->in6p_flags & IN6P_LOWPORT) {
431	#ifdef __NetBSD__
432	if (p == 0 \|\| (suser(p->p_ucred, &p->p_acflag) != 0))
433	return (EACCES);
434	#else
435	if ((so->so_state & SS_PRIV) == 0)
436	return (EACCES);
437	#endif
438	min = IPV6PORT_RESERVEDMIN;
439	max = IPV6PORT_RESERVEDMAX;
440	} else {
441	min = IPV6PORT_ANONMIN;
442	max = IPV6PORT_ANONMAX;
443	}
444
445	/* value out of range */
446	if (head->in6p_lport < min)
447	head->in6p_lport = min;
448	else if (head->in6p_lport > max)
449	head->in6p_lport = min;
450	last_port = head->in6p_lport;
451	goto startover; /to randomize/
452	for (;;) {
453	lport = htons(head->in6p_lport);
454	if (IN6_IS_ADDR_V4MAPPED(laddr)) {
455	#if 0
456	t = in_pcblookup_bind(&tcbtable,
457	(struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
458	lport);
459	#else
460	t = NULL;
461	#endif
462	} else {
463	#if HAVE_NRL_INPCB
464	/* XXX: ugly cast... */
465	t = in_pcblookup(head, (struct in_addr *)&zeroin6_addr,
466	0, (struct in_addr *)laddr,
467	lport, wild \| INPLOOKUP_IPV6);
468	#else
469	t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
470	lport, wild);
471	#endif
472	}
473	if (t == 0)
474	break;
475	startover:
476	if (head->in6p_lport >= max)
477	head->in6p_lport = min;
478	else
479	head->in6p_lport++;
480	if (head->in6p_lport == last_port)
481	return (EADDRINUSE);
482	}
483
484	in6p->in6p_lport = lport;
485	return(0); /* success */
486	}
487	#if HAVE_NRL_INPCB
488	#undef in6pcb
489	#undef in6p_socket
490	#undef in6p_lport
491	#undef in6p_head
492	#undef in6p_flags
493	#undef IN6PLOOKUP_WILDCARD
494	#endif
495	#endif /* !FreeBSD3 && !OpenBSD*/