in_pcb.c

VxWorks网络部分的源代码

/* in_pcb.c - internet protocol control block routines */

/* Copyright 1984-1996 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
 * Copyright (c) 1982, 1986, 1991, 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.
 * 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	8.4 (Berkeley) 5/24/95
 */

/*
modification history
--------------------
01h,11feb00,gnn  first checkin to openstack (Siemens ONLY)
01g,02nov99,pul  modifications to support enhanced routing interface
01f,05oct97,vin  changed ip_freemoptions for new multicasting changes.
01e,01jul97,vin  added rtMissMsgHook for scalability of routing sockets.
01d,31mar97,vin  integrated with FREEBSD 2.2.1 for hashlookups of pcbs
01c,05feb97,rjc  changed for tos routing.
01b,05dec96,vin  replaced malloc with MALLOC and free with FREE(),
01a,03mar96,vin  created from BSD4.4 stuff,integrated with 02k of in_pcb.c
*/

/*
DESCRIPTION
*/

#include "vxWorks.h"
#include "net/systm.h"
#include "errno.h"
#include "net/mbuf.h"
#include "sys/socket.h"
#include "net/socketvar.h"
#include "sys/ioctl.h"
#include "net/if.h"
#include "netinet/in.h"
#include "netinet/in_systm.h"
#include "net/route.h"
#include "netinet/in_pcb.h"
#include "netinet/in_var.h"
#include "netinet/ip_var.h"
#include "net/protosw.h"
#include "routeEnhLib.h"

struct	in_addr zeroin_addr;

int
in_pcballoc(so, pcbinfo)
	struct socket *so;
	struct inpcbinfo *pcbinfo;
{
	register struct inpcb *inp;
	int s;

	MALLOC(inp, struct inpcb *, sizeof(*inp), MT_PCB, M_DONTWAIT);
	if (inp == NULL)
		return (ENOBUFS);
	bzero((caddr_t)inp, sizeof(*inp));
	inp->inp_pcbinfo = pcbinfo;
	inp->inp_socket = so;
	s = splnet();
	LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
	in_pcbinshash(inp);
	splx(s);
	so->so_pcb = (caddr_t)inp;
	return (0);
}

int
in_pcbbind(inp, nam)
	register struct inpcb *inp;
	struct mbuf *nam;
{
	register struct socket *so = inp->inp_socket;
	unsigned short *lastport = &inp->inp_pcbinfo->lastport;
	struct sockaddr_in *sin;
	u_short lport = 0;
	int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);

	if (in_ifaddr == 0)
		return (EADDRNOTAVAIL);
	if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
		return (EINVAL);
	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
	    ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
	     (so->so_options & SO_ACCEPTCONN) == 0))
		wild = INPLOOKUP_WILDCARD;
	if (nam) {
		sin = mtod(nam, struct sockaddr_in *);
		if (nam->m_len != sizeof (*sin))
			return (EINVAL);
#ifdef notdef
		/*
		 * We should check the family, but old programs
		 * incorrectly fail to initialize it.
		 */
		if (sin->sin_family != AF_INET)
			return (EAFNOSUPPORT);
#endif
		lport = sin->sin_port;
		if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
			/*
			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
			 * allow complete duplication of binding if
			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
			 * and a multicast address is bound on both
			 * new and duplicated sockets.
			 */
			if (so->so_options & SO_REUSEADDR)
				reuseport = SO_REUSEADDR|SO_REUSEPORT;
		} else if (sin->sin_addr.s_addr != INADDR_ANY) {
			sin->sin_port = 0;		/* yech... */
			if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
				return (EADDRNOTAVAIL);
		}
		if (lport) {
			struct inpcb *t;

			/* GROSS */
#if 0 /* XXX took out because we are always in super user mode. */
			if (ntohs(lport) < IPPORT_RESERVED &&
			    (error = suser(p->p_ucred, &p->p_acflag)))
				return (EACCES);
#endif
			t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr, 0,
			    sin->sin_addr, lport, wild);
			if (t && (reuseport & t->inp_socket->so_options) == 0)
				return (EADDRINUSE);
		}
		inp->inp_laddr = sin->sin_addr;
	}
	if (lport == 0)
		do {
			++*lastport;
			if (*lastport < IPPORT_RESERVED ||
			    *lastport > IPPORT_USERRESERVED)
				*lastport = IPPORT_RESERVED;
			lport = htons(*lastport);
		} while (in_pcblookup(inp->inp_pcbinfo,
			    zeroin_addr, 0, inp->inp_laddr, lport, wild));
	inp->inp_lport = lport;
	in_pcbrehash(inp);
	return (0);
}

/*
 *   Transform old in_pcbconnect() into an inner subroutine for new
 *   in_pcbconnect(): Do some validity-checking on the remote
 *   address (in mbuf 'nam') and then determine local host address
 *   (i.e., which interface) to use to access that remote host.
 *
 *   This preserves definition of in_pcbconnect(), while supporting a
 *   slightly different version for T/TCP.  (This is more than
 *   a bit of a kludge, but cleaning up the internal interfaces would
 *   have forced minor changes in every protocol).
 */

int
in_pcbladdr(inp, nam, plocal_sin)
	register struct inpcb *inp;
	struct mbuf *nam;
	struct sockaddr_in **plocal_sin;
{
	struct in_ifaddr *ia;
	register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);

	if (nam->m_len != sizeof (*sin))
		return (EINVAL);
	if (sin->sin_family != AF_INET)
		return (EAFNOSUPPORT);
	if (sin->sin_port == 0)
		return (EADDRNOTAVAIL);
	if (in_ifaddr) {
		/*
		 * If the destination address is INADDR_ANY,
		 * use the primary local address.
		 * If the supplied address is INADDR_BROADCAST,
		 * and the primary interface supports broadcast,
		 * choose the broadcast address for that interface.
		 */
#define	satosin(sa)	((struct sockaddr_in *)(sa))
#define sintosa(sin)	((struct sockaddr *)(sin))
#define ifatoia(ifa)	((struct in_ifaddr *)(ifa))
		if (sin->sin_addr.s_addr == INADDR_ANY)
		    sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;
		else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
		  (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))
		    sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr;
	}
	if (inp->inp_laddr.s_addr == INADDR_ANY) {
		register struct route *ro;

		ia = (struct in_ifaddr *)0;
		/*
		 * If route is known or can be allocated now,
		 * our src addr is taken from the i/f, else punt.
		 */
		ro = &inp->inp_route;
		if (ro->ro_rt &&
		    (satosin(&ro->ro_dst)->sin_addr.s_addr !=
			sin->sin_addr.s_addr ||
		    inp->inp_socket->so_options & SO_DONTROUTE)) {
			RTFREE(ro->ro_rt);
			ro->ro_rt = (struct rtentry *)0;
		}
		if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
		    (ro->ro_rt == (struct rtentry *)0 ||
		    ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
			/* No route yet, so try to acquire one */
			ro->ro_dst.sa_family = AF_INET;
			ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
			((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
				sin->sin_addr;
                        TOS_SET ((struct sockaddr_in *) &ro->ro_dst, inp->inp_ip.ip_tos);
			rtalloc(ro);
		}
		/*
		 * If we found a route, use the address
		 * corresponding to the outgoing interface
		 * unless it is the loopback (in case a route
		 * to our address on another net goes to loopback).
		 */
		if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
			ia = ifatoia(ro->ro_rt->rt_ifa);
		if (ia == 0) {
			u_short fport = sin->sin_port;

			sin->sin_port = 0;
			ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
			if (ia == 0)
				ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
			sin->sin_port = fport;
			if (ia == 0)
				ia = in_ifaddr;
			if (ia == 0)
				return (EADDRNOTAVAIL);
		}
		/*
		 * If the destination address is multicast and an outgoing
		 * interface has been set as a multicast option, use the
		 * address of that interface as our source address.
		 */
		if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
		    inp->inp_moptions != NULL) {
			struct ip_moptions *imo;
			struct ifnet *ifp;

			imo = inp->inp_moptions;
			if (imo->imo_multicast_ifp != NULL) {
				ifp = imo->imo_multicast_ifp;
				for (ia = in_ifaddr; ia; ia = ia->ia_next)
					if (ia->ia_ifp == ifp)
						break;
				if (ia == 0)
					return (EADDRNOTAVAIL);
			}
		}
	/*
	 * Don't do pcblookup call here; return interface in plocal_sin
	 * and exit to caller, that will do the lookup.
	 */
		*plocal_sin = &ia->ia_addr;

	}
	return(0);
}

/*
 * Outer subroutine:
 * Connect from a socket to a specified address.
 * Both address and port must be specified in argument sin.
 * If don't have a local address for this socket yet,
 * then pick one.
 */
int
in_pcbconnect(inp, nam)
	register struct inpcb *inp;
	struct mbuf *nam;
{
	struct sockaddr_in *ifaddr;
	register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
	int error;

	/*
	 *   Call inner routine, to assign local interface address.
	 */
	if ((error = in_pcbladdr(inp, nam, &ifaddr)) != 0)
		return(error);

	if (in_pcblookuphash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,
	    ((inp->inp_laddr.s_addr) ? inp->inp_laddr : ifaddr->sin_addr),
	    inp->inp_lport, 0) != NULL)
		return (EADDRINUSE);
	if (inp->inp_laddr.s_addr == INADDR_ANY) {
		if (inp->inp_lport == 0)
			(void)in_pcbbind(inp, (struct mbuf *)0);
		inp->inp_laddr = ifaddr->sin_addr;
	}
	inp->inp_faddr = sin->sin_addr;
	inp->inp_fport = sin->sin_port;
	in_pcbrehash(inp);
	return (0);