if_fddisubr.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 704 行 · 第 1/2 页

/*
 * Copyright (c) 1995, 1996
 *	Matt Thomas <[e-mail]>.  All rights reserved.
 * Copyright (c) 1982, 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.
 *
 *	from: if_ethersubr.c,v 1.5 1994/12/13 22:31:45 wollman Exp
 * $Id: if_fddisubr.c,v 1.33 1998/06/21 14:53:23 bde Exp $
 */

#include "opt_atalk.h"
#include "opt_inet.h"
#include "opt_ipx.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_llc.h>
#include <net/if_dl.h>
#include <net/if_types.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#if defined(__FreeBSD__)
#include <netinet/if_fddi.h>
#else
#include <net/if_fddi.h>
#endif

#ifdef IPX
#include <netipx/ipx.h> 
#include <netipx/ipx_if.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#ifdef DECNET
#include <netdnet/dn.h>
#endif

#ifdef ISO
#include <netiso/argo_debug.h>
#include <netiso/iso.h>
#include <netiso/iso_var.h>
#include <netiso/iso_snpac.h>
#endif

#ifdef LLC
#include <netccitt/dll.h>
#include <netccitt/llc_var.h>
#endif

#ifdef NETATALK
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/at_extern.h>

#define llc_snap_org_code llc_un.type_snap.org_code
#define llc_snap_ether_type llc_un.type_snap.ether_type

extern u_char	at_org_code[ 3 ];
extern u_char	aarp_org_code[ 3 ];
#endif /* NETATALK */

#if defined(LLC) && defined(CCITT)
extern struct ifqueue pkintrq;
#endif

#include "bpfilter.h"

#define senderr(e) { error = (e); goto bad;}

/*
 * This really should be defined in if_llc.h but in case it isn't.
 */
#ifndef llc_snap
#define	llc_snap	llc_un.type_snap
#endif

#if defined(__bsdi__) || defined(__NetBSD__)
#define	RTALLOC1(a, b)			rtalloc1(a, b)
#define	ARPRESOLVE(a, b, c, d, e, f)	arpresolve(a, b, c, d, e)
#elif defined(__FreeBSD__)
#define	RTALLOC1(a, b)			rtalloc1(a, b, 0UL)
#define	ARPRESOLVE(a, b, c, d, e, f)	arpresolve(a, b, c, d, e, f)
#endif
/*
 * FDDI output routine.
 * Encapsulate a packet of type family for the local net.
 * Use trailer local net encapsulation if enough data in first
 * packet leaves a multiple of 512 bytes of data in remainder.
 * Assumes that ifp is actually pointer to arpcom structure.
 */
int
fddi_output(ifp, m0, dst, rt0)
	register struct ifnet *ifp;
	struct mbuf *m0;
	struct sockaddr *dst;
	struct rtentry *rt0;
{
	u_int16_t type;
	int s, loop_copy = 0, error = 0;
 	u_char edst[6];
	register struct mbuf *m = m0;
	register struct rtentry *rt;
	register struct fddi_header *fh;
	struct arpcom *ac = (struct arpcom *)ifp;

	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
		senderr(ENETDOWN);
	getmicrotime(&ifp->if_lastchange);
#if !defined(__bsdi__) || _BSDI_VERSION >= 199401
	if (rt = rt0) {
		if ((rt->rt_flags & RTF_UP) == 0) {
			if (rt0 = rt = RTALLOC1(dst, 1))
				rt->rt_refcnt--;
			else 
				senderr(EHOSTUNREACH);
		}
		if (rt->rt_flags & RTF_GATEWAY) {
			if (rt->rt_gwroute == 0)
				goto lookup;
			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
				rtfree(rt); rt = rt0;
			lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 1);
				if ((rt = rt->rt_gwroute) == 0)
					senderr(EHOSTUNREACH);
			}
		}
		if (rt->rt_flags & RTF_REJECT)
			if (rt->rt_rmx.rmx_expire == 0 ||
			    time_second < rt->rt_rmx.rmx_expire)
				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
	}
#endif
	switch (dst->sa_family) {

#ifdef INET
	case AF_INET: {
#if !defined(__bsdi__) || _BSDI_VERSION >= 199401
		if (!ARPRESOLVE(ac, rt, m, dst, edst, rt0))
			return (0);	/* if not yet resolved */
#else
		int usetrailers;
		if (!arpresolve(ac, m, &((struct sockaddr_in *)dst)->sin_addr, edst, &usetrailers))
			return (0);	/* if not yet resolved */
#endif
		type = htons(ETHERTYPE_IP);
		break;
	}
#endif
#ifdef IPX
	case AF_IPX:
		type = htons(ETHERTYPE_IPX);
 		bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
		    (caddr_t)edst, sizeof (edst));
		break;
#endif
#ifdef NETATALK
	case AF_APPLETALK: {
	    struct at_ifaddr *aa;
            if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
                return (0);
	    /*
	     * ifaddr is the first thing in at_ifaddr
	     */
	    if ((aa = at_ifawithnet( (struct sockaddr_at *)dst)) == 0)
		goto bad;
	    
	    /*
	     * In the phase 2 case, we need to prepend an mbuf for the llc header.
	     * Since we must preserve the value of m, which is passed to us by
	     * value, we m_copy() the first mbuf, and use it for our llc header.
	     */
	    if (aa->aa_flags & AFA_PHASE2) {
		struct llc llc;

		M_PREPEND(m, sizeof(struct llc), M_WAIT);
		if (m == 0)
			senderr(ENOBUFS);
		llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
		llc.llc_control = LLC_UI;
		bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
		llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
		bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
		type = 0;
	    } else {
		type = htons(ETHERTYPE_AT);
	    }
	    break;
	}
#endif /* NETATALK */
#ifdef NS
	case AF_NS:
		type = htons(ETHERTYPE_NS);
 		bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
		    (caddr_t)edst, sizeof (edst));
		break;
#endif
#ifdef	ISO
	case AF_ISO: {
		int	snpalen;
		struct	llc *l;
		register struct sockaddr_dl *sdl;

		if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&
		    sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
			bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));
		} else if (error =
			    iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
					    (char *)edst, &snpalen))
			goto bad; /* Not Resolved */
		/* If broadcasting on a simplex interface, loopback a copy */
		if (*edst & 1)
			m->m_flags |= (M_BCAST|M_MCAST);
		M_PREPEND(m, 3, M_DONTWAIT);
		if (m == NULL)
			return (0);
		type = 0;
		l = mtod(m, struct llc *);
		l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
		l->llc_control = LLC_UI;
		IFDEBUG(D_ETHER)
			int i;
			printf("unoutput: sending pkt to: ");
			for (i=0; i<6; i++)
				printf("%x ", edst[i] & 0xff);
			printf("\n");
		ENDDEBUG
		} break;
#endif /* ISO */
#ifdef	LLC
/*	case AF_NSAP: */
	case AF_CCITT: {
		register struct sockaddr_dl *sdl = 
			(struct sockaddr_dl *) rt -> rt_gateway;

		if (sdl && sdl->sdl_family != AF_LINK && sdl->sdl_alen <= 0)
			goto bad; /* Not a link interface ? Funny ... */
		bcopy(LLADDR(sdl), (char *)edst, sizeof(edst));
		if (*edst & 1)
			loop_copy = 1;
		type = 0;
#ifdef LLC_DEBUG
		{
			int i;
			register struct llc *l = mtod(m, struct llc *);

			printf("fddi_output: sending LLC2 pkt to: ");
			for (i=0; i<6; i++)
				printf("%x ", edst[i] & 0xff);
			printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 
			       type & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff,
			       l->llc_control & 0xff);

		}
#endif /* LLC_DEBUG */
		} break;
#endif /* LLC */	

	case AF_UNSPEC:
	{
		struct ether_header *eh;
		loop_copy = -1;
		eh = (struct ether_header *)dst->sa_data;
 		(void)memcpy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));
		if (*edst & 1)
			m->m_flags |= (M_BCAST|M_MCAST);
		type = eh->ether_type;
		break;
	}

#if NBPFILTER > 0
	case AF_IMPLINK:
	{
		fh = mtod(m, struct fddi_header *);
		error = EPROTONOSUPPORT;
		switch (fh->fddi_fc & (FDDIFC_C|FDDIFC_L|FDDIFC_F)) {
			case FDDIFC_LLC_ASYNC: {
				/* legal priorities are 0 through 7 */
				if ((fh->fddi_fc & FDDIFC_Z) > 7)
			        	goto bad;
				break;
			}
			case FDDIFC_LLC_SYNC: {
				/* FDDIFC_Z bits reserved, must be zero */
				if (fh->fddi_fc & FDDIFC_Z)
					goto bad;
				break;
			}
			case FDDIFC_SMT: {
				/* FDDIFC_Z bits must be non zero */
				if ((fh->fddi_fc & FDDIFC_Z) == 0)
					goto bad;
				break;
			}
			default: {
				/* anything else is too dangerous */
               	 		goto bad;
			}
		}
		error = 0;
		if (fh->fddi_dhost[0] & 1)
			m->m_flags |= (M_BCAST|M_MCAST);
		goto queue_it;
	}
#endif
	default:
		printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
			dst->sa_family);
		senderr(EAFNOSUPPORT);
	}