[apple/xnu.git] / bsd / net / ether_if_module.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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.
 *
 */


#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.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>
#include <netinet/if_ether.h>
#include <netinet/in.h>	/* For M_LOOP */

/*
#if INET
#include <netinet/in.h>
#include <netinet/in_var.h>

#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
*/

#include <sys/socketvar.h>

#include <net/dlil.h>


#if LLC && CCITT
extern struct ifqueue pkintrq;
#endif

/* General stuff from if_ethersubr.c - may not need some of it */

#include <netat/at_pat.h>
#if NETAT
extern struct ifqueue atalkintrq;
#endif


#if BRIDGE
#include <net/bridge.h>
#endif

/* #include "vlan.h" */
#if NVLAN > 0
#include <net/if_vlan_var.h>
#endif /* NVLAN > 0 */

static u_long lo_dlt = 0;

#define IFP2AC(IFP) ((struct arpcom *)IFP)

struct en_desc {
    u_int16_t		type;		/* Type of protocol stored in data */
    struct if_proto *proto;		/* Protocol structure */
    u_long			data[2];	/* Protocol data */
};

#define ETHER_DESC_BLK_SIZE (10)
#define MAX_INTERFACES 50

/*
 * Statics for demux module
 */

struct ether_desc_blk_str {
    u_long  n_max_used;
    u_long	n_count;
    struct en_desc  *block_ptr;
};


static struct ether_desc_blk_str ether_desc_blk[MAX_INTERFACES];


/*
 * Release all descriptor entries owned by this dl_tag (there may be several).
 * Setting the type to 0 releases the entry. Eventually we should compact-out
 * the unused entries.
 */
static
int  ether_del_proto(struct if_proto *proto, u_long dl_tag)
{
    struct en_desc*	ed = ether_desc_blk[proto->ifp->family_cookie].block_ptr;
    u_long	current = 0;
    int found = 0;
    
    for (current = ether_desc_blk[proto->ifp->family_cookie].n_max_used;
            current > 0; current--) {
        if (ed[current - 1].proto == proto) {
            found = 1;
            ed[current - 1].type = 0;
            
            if (current == ether_desc_blk[proto->ifp->family_cookie].n_max_used) {
                ether_desc_blk[proto->ifp->family_cookie].n_max_used--;
            }
        }
    }
    
    return found;
 }


static int
ether_add_proto(struct ddesc_head_str *desc_head, struct if_proto *proto, u_long dl_tag)
{
   char *current_ptr;
   struct dlil_demux_desc  *desc;
   struct en_desc	   *ed;
   struct en_desc *last;
   u_long		   *bitmask;
   u_long		   *proto_id;
   u_long		   i;
   short		   total_length;
   u_long		   block_count;
   u_long                  *tmp;


    TAILQ_FOREACH(desc, desc_head, next) {
        switch (desc->type) {
            /* These types are supported */
            /* Top three are preferred */
            case DLIL_DESC_ETYPE2:
                if (desc->variants.native_type_length != 2)
                    return EINVAL;
                break;
                
            case DLIL_DESC_SAP:
                if (desc->variants.native_type_length != 3)
                    return EINVAL;
                break;
                
            case DLIL_DESC_SNAP:
                if (desc->variants.native_type_length != 5)
                    return EINVAL;
                break;
                
            case DLIL_DESC_802_2:
            case DLIL_DESC_802_2_SNAP:
                break;
            
            case DLIL_DESC_RAW:
                if (desc->variants.bitmask.proto_id_length == 0)
                    break;
                /* else fall through, bitmask variant not supported */
            
            default:
                ether_del_proto(proto, dl_tag);
                return EINVAL;
        }
    
    restart:
        ed = ether_desc_blk[proto->ifp->family_cookie].block_ptr;
        
        /* Find a free entry */
        for (i = 0; i < ether_desc_blk[proto->ifp->family_cookie].n_count; i++) {
            if (ed[i].type == 0) {
                break;
            }
        }
        
        if (i >= ether_desc_blk[proto->ifp->family_cookie].n_count) {
            u_long	new_count = ETHER_DESC_BLK_SIZE +
                        ether_desc_blk[proto->ifp->family_cookie].n_count;
            tmp = _MALLOC((new_count * (sizeof(*ed))), M_IFADDR, M_WAITOK);
            if (tmp  == 0) {
                /*
                * Remove any previous descriptors set in the call.
                */
                ether_del_proto(proto, dl_tag);
                return ENOMEM;
            }
            
            bzero(tmp, new_count * sizeof(*ed));
            bcopy(ether_desc_blk[proto->ifp->family_cookie].block_ptr, 
                tmp, ether_desc_blk[proto->ifp->family_cookie].n_count * sizeof(*ed));
            FREE(ether_desc_blk[proto->ifp->family_cookie].block_ptr, M_IFADDR);
            ether_desc_blk[proto->ifp->family_cookie].n_count = new_count;
            ether_desc_blk[proto->ifp->family_cookie].block_ptr = (struct en_desc*)tmp;
        }
        
        /* Bump n_max_used if appropriate */
        if (i + 1 > ether_desc_blk[proto->ifp->family_cookie].n_max_used) {
            ether_desc_blk[proto->ifp->family_cookie].n_max_used = i + 1;
        }
        
        ed[i].proto	= proto;
        ed[i].data[0] = 0;
        ed[i].data[1] = 0;
        
        switch (desc->type) {
            case DLIL_DESC_RAW:
                /* 2 byte ethernet raw protocol type is at native_type */
                /* protocol is not in network byte order */
                ed[i].type = DLIL_DESC_ETYPE2;
                ed[i].data[0] = htons(*(u_int16_t*)desc->native_type);
                break;
                
            case DLIL_DESC_ETYPE2:
                /* 2 byte ethernet raw protocol type is at native_type */
                /* prtocol must be in network byte order */
                ed[i].type = DLIL_DESC_ETYPE2;
                ed[i].data[0] = *(u_int16_t*)desc->native_type;
                break;
            
            case DLIL_DESC_802_2:
                ed[i].type = DLIL_DESC_SAP;
                ed[i].data[0] = *(u_int32_t*)&desc->variants.desc_802_2;
                ed[i].data[0] &= htonl(0xFFFFFF00);
                break;
            
            case DLIL_DESC_SAP:
                ed[i].type = DLIL_DESC_SAP;
                bcopy(desc->native_type, &ed[i].data[0], 3);
                break;
    
            case DLIL_DESC_802_2_SNAP:
                ed[i].type = DLIL_DESC_SNAP;
                desc->variants.desc_802_2_SNAP.protocol_type =
                    htons(desc->variants.desc_802_2_SNAP.protocol_type);
                bcopy(&desc->variants.desc_802_2_SNAP, &ed[i].data[0], 8);
                ed[i].data[0] &= htonl(0x000000FF);
                desc->variants.desc_802_2_SNAP.protocol_type =
                    ntohs(desc->variants.desc_802_2_SNAP.protocol_type);
                break;
            
            case DLIL_DESC_SNAP: {
                u_int8_t*	pDest = ((u_int8_t*)&ed[i].data[0]) + 3;
                ed[i].type = DLIL_DESC_SNAP;
                bcopy(desc->native_type, pDest, 5);
            }
            break;
        }
    }
    
    return 0;
} 


static
int  ether_shutdown()
{
    return 0;
}


int ether_demux(ifp, m, frame_header, proto)
    struct ifnet *ifp;
    struct mbuf  *m;
    char         *frame_header;
    struct if_proto **proto;

{
    register struct ether_header *eh = (struct ether_header *)frame_header;
    u_short			ether_type = eh->ether_type;
    u_int16_t		type;
    u_int8_t		*data;
    u_long			i = 0;
    u_long			max = ether_desc_blk[ifp->family_cookie].n_max_used;
    struct en_desc	*ed = ether_desc_blk[ifp->family_cookie].block_ptr;
    u_int32_t		extProto1 = 0;
    u_int32_t		extProto2 = 0;
    
    if (eh->ether_dhost[0] & 1) {
        /* Check for broadcast */
        if (*(u_int32_t*)eh->ether_dhost == 0xFFFFFFFF &&
            *(u_int16_t*)(eh->ether_dhost + sizeof(u_int32_t)) == 0xFFFF)
            m->m_flags |= M_BCAST;
        else
            m->m_flags |= M_MCAST;
    } else {
        /*
         * When the driver is put into promiscuous mode we may receive unicast
         * frames that are not intended for our interfaces.  They are filtered
         * here to keep them from traveling further up the stack to code that
         * is not expecting them or prepared to deal with them.  In the near
         * future, the filtering done here will be moved even further down the
         * stack into the IONetworkingFamily, preventing even interface
         * filter NKE's from receiving promiscuous packets.  Please use BPF.
         */
        #define ETHER_CMP(x, y) ( ((u_int16_t *) x)[0] != ((u_int16_t *) y)[0] || \
                                  ((u_int16_t *) x)[1] != ((u_int16_t *) y)[1] || \
                                  ((u_int16_t *) x)[2] != ((u_int16_t *) y)[2] )
    
        if (ETHER_CMP(eh->ether_dhost, ((struct arpcom *) ifp)->ac_enaddr)) {
            m_freem(m);
            return EJUSTRETURN;
        }
    }
    
    data = mtod(m, u_int8_t*);
    
    /*
     * Determine the packet's protocol type and stuff the protocol into
     * longs for quick compares.
     */
    
    if (ntohs(ether_type) <= 1500) {
        extProto1 = *(u_int32_t*)data;
        
        // SAP or SNAP
        if ((extProto1 & htonl(0xFFFFFF00)) == htonl(0xAAAA0300)) {
            // SNAP
            type = DLIL_DESC_SNAP;
            extProto2 = *(u_int32_t*)(data + sizeof(u_int32_t));
            extProto1 &= htonl(0x000000FF);
        } else {
            type = DLIL_DESC_SAP;
            extProto1 &= htonl(0xFFFFFF00);
        }
    } else {
        type = DLIL_DESC_ETYPE2;
    }
    
    /* 
     * Search through the connected protocols for a match. 
     */
    
    switch (type) {
        case DLIL_DESC_ETYPE2:
            for (i = 0; i < max; i++) {
                if ((ed[i].type == type) && (ed[i].data[0] == ether_type)) {
                    *proto = ed[i].proto;
                    return 0;
                }
            }
            break;
        
        case DLIL_DESC_SAP:
            for (i = 0; i < max; i++) {
                if ((ed[i].type == type) && (ed[i].data[0] == extProto1)) {
                    *proto = ed[i].proto;
                    return 0;
                }
            }
            break;
        
        case DLIL_DESC_SNAP:
            for (i = 0; i < max; i++) {
                if ((ed[i].type == type) && (ed[i].data[0] == extProto1) &&
                    (ed[i].data[1] == extProto2)) {
                    *proto = ed[i].proto;
                    return 0;
                }
            }
            break;
    }
    
    return ENOENT;
}			


/*
 * Ethernet 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
ether_frameout(ifp, m, ndest, edst, ether_type)
	register struct ifnet	*ifp;
	struct mbuf		**m;
	struct sockaddr		*ndest;
	char			*edst;
	char			*ether_type;
{
	register struct ether_header *eh;
	int hlen;	/* link layer header lenght */
	struct arpcom *ac = IFP2AC(ifp);


	hlen = ETHER_HDR_LEN;

	/*
	 * If a simplex interface, and the packet is being sent to our
	 * Ethernet address or a broadcast address, loopback a copy.
	 * XXX To make a simplex device behave exactly like a duplex
	 * device, we should copy in the case of sending to our own
	 * ethernet address (thus letting the original actually appear
	 * on the wire). However, we don't do that here for security
	 * reasons and compatibility with the original behavior.
	 */
	if ((ifp->if_flags & IFF_SIMPLEX) &&
	    ((*m)->m_flags & M_LOOP)) {
	    if (lo_dlt == 0) 
            dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dlt);

	    if (lo_dlt) {
            if ((*m)->m_flags & M_BCAST) {
                struct mbuf *n = m_copy(*m, 0, (int)M_COPYALL);
                if (n != NULL)
                    dlil_output(lo_dlt, n, 0, ndest, 0);
            } 
            else 
            {
                if (bcmp(edst,  ac->ac_enaddr, ETHER_ADDR_LEN) == 0) {
                    dlil_output(lo_dlt, *m, 0, ndest, 0);
                    return EJUSTRETURN;
                }
            }
	    }
	}
    
    
	/*
	 * Add local net header.  If no space in first mbuf,
	 * allocate another.
	 */
	M_PREPEND(*m, sizeof (struct ether_header), M_DONTWAIT);
	if (*m == 0) {
	    return (EJUSTRETURN);
	}


	eh = mtod(*m, struct ether_header *);
	(void)memcpy(&eh->ether_type, ether_type,
		sizeof(eh->ether_type));
 	(void)memcpy(eh->ether_dhost, edst, 6);
 	(void)memcpy(eh->ether_shost, ac->ac_enaddr,
	    sizeof(eh->ether_shost));

	return 0;
}


static
int  ether_add_if(struct ifnet *ifp)
{
    u_long  i;

    ifp->if_framer = ether_frameout;
    ifp->if_demux  = ether_demux;
    ifp->if_event  = 0;

    for (i=0; i < MAX_INTERFACES; i++)
        if (ether_desc_blk[i].n_count == 0)
            break;

    if (i == MAX_INTERFACES)
        return ENOMEM;

    ether_desc_blk[i].block_ptr = _MALLOC(ETHER_DESC_BLK_SIZE * sizeof(struct en_desc),
                                            M_IFADDR, M_WAITOK);
    if (ether_desc_blk[i].block_ptr == 0)
        return ENOMEM;

    ether_desc_blk[i].n_count = ETHER_DESC_BLK_SIZE;
    bzero(ether_desc_blk[i].block_ptr, ETHER_DESC_BLK_SIZE * sizeof(struct en_desc));

    ifp->family_cookie = i;
    
    return 0;
}

static
int  ether_del_if(struct ifnet *ifp)
{
    if ((ifp->family_cookie < MAX_INTERFACES) &&
        (ether_desc_blk[ifp->family_cookie].n_count))
    {
        FREE(ether_desc_blk[ifp->family_cookie].block_ptr, M_IFADDR);
        ether_desc_blk[ifp->family_cookie].block_ptr = NULL;
        ether_desc_blk[ifp->family_cookie].n_count = 0;
        ether_desc_blk[ifp->family_cookie].n_max_used = 0;
        return 0;
    }
    else
        return ENOENT;
}

static
int  ether_init_if(struct ifnet *ifp)
{
    register struct ifaddr *ifa;
    register struct sockaddr_dl *sdl;

    ifa = ifnet_addrs[ifp->if_index - 1];
    if (ifa == 0) {
            printf("ether_ifattach: no lladdr!\n");
            return;
    }
    sdl = (struct sockaddr_dl *)ifa->ifa_addr;
    sdl->sdl_type = IFT_ETHER;
    sdl->sdl_alen = ifp->if_addrlen;
    bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);

    return 0;
}


int
ether_ifmod_ioctl(ifp, command, data)
    struct ifnet *ifp;
    u_long       command;
    caddr_t      data;
{
    struct rslvmulti_req *rsreq = (struct rslvmulti_req *) data;
    int error = 0;
    struct sockaddr_dl *sdl;
    struct sockaddr_in *sin;
    u_char *e_addr;


    switch (command) {
        case SIOCRSLVMULTI: 
        switch(rsreq->sa->sa_family) {
            case AF_UNSPEC:
                /* AppleTalk uses AF_UNSPEC for multicast registration.
                 * No mapping needed. Just check that it's a valid MC address.
                 */
                e_addr = &rsreq->sa->sa_data[0];
                if ((e_addr[0] & 1) != 1)
                    return EADDRNOTAVAIL;
                *rsreq->llsa = 0;
                return EJUSTRETURN;
            
            
            case AF_LINK:
                /* 
                 * No mapping needed. Just check that it's a valid MC address.
                 */
                sdl = (struct sockaddr_dl *)rsreq->sa;
                e_addr = LLADDR(sdl);
                if ((e_addr[0] & 1) != 1)
                    return EADDRNOTAVAIL;
                *rsreq->llsa = 0;
                return EJUSTRETURN;
                
            default:
                return EAFNOSUPPORT;
        }
        
        default:
            return EOPNOTSUPP;
    }
}


int ether_family_init()
{
    int  i;
    struct dlil_ifmod_reg_str  ifmod_reg;

    /* ethernet family is built-in, called from bsd_init */
    thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);

    bzero(&ifmod_reg, sizeof(ifmod_reg));
    ifmod_reg.add_if = ether_add_if;
    ifmod_reg.del_if = ether_del_if;
    ifmod_reg.init_if = ether_init_if;
    ifmod_reg.add_proto = ether_add_proto;
    ifmod_reg.del_proto = ether_del_proto;
    ifmod_reg.ifmod_ioctl = ether_ifmod_ioctl;
    ifmod_reg.shutdown    = ether_shutdown;

    if (dlil_reg_if_modules(APPLE_IF_FAM_ETHERNET, &ifmod_reg)) {
        printf("WARNING: ether_family_init -- Can't register if family modules\n");
        return EIO;
    }

    for (i=0; i < MAX_INTERFACES; i++)
        ether_desc_blk[i].n_count = 0;

    thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);

    return 0;
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1982, 1989, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	*/
	55
	56
	57
	58	#include <sys/param.h>
	59	#include <sys/systm.h>
	60	#include <sys/kernel.h>
	61	#include <sys/malloc.h>
	62	#include <sys/mbuf.h>
	63	#include <sys/socket.h>
	64	#include <sys/sockio.h>
	65	#include <sys/sysctl.h>
	66
	67	#include <net/if.h>
	68	#include <net/netisr.h>
	69	#include <net/route.h>
	70	#include <net/if_llc.h>
	71	#include <net/if_dl.h>
	72	#include <net/if_types.h>
1c79356b	73	#include <netinet/if_ether.h>
9bccf70c	74	#include <netinet/in.h> /* For M_LOOP */
1c79356b A	75
	76	/*
	77	#if INET
	78	#include <netinet/in.h>
	79	#include <netinet/in_var.h>
	80
	81	#include <netinet/in_systm.h>
	82	#include <netinet/ip.h>
	83	#endif
	84	*/
	85
	86	#include <sys/socketvar.h>
	87
	88	#include <net/dlil.h>
	89
	90
	91	#if LLC && CCITT
	92	extern struct ifqueue pkintrq;
	93	#endif
	94
	95	/* General stuff from if_ethersubr.c - may not need some of it */
	96
	97	#include <netat/at_pat.h>
	98	#if NETAT
	99	extern struct ifqueue atalkintrq;
	100	#endif
	101
	102
	103	#if BRIDGE
	104	#include <net/bridge.h>
	105	#endif
	106
	107	/* #include "vlan.h" */
	108	#if NVLAN > 0
	109	#include <net/if_vlan_var.h>
	110	#endif /* NVLAN > 0 */
	111
	112	static u_long lo_dlt = 0;
1c79356b A	113
	114	#define IFP2AC(IFP) ((struct arpcom *)IFP)
	115
1c79356b	116	struct en_desc {
7b1edb79 A	117	u_int16_t type; /* Type of protocol stored in data */
	118	struct if_proto proto; / Protocol structure */
	119	u_long data[2]; /* Protocol data */
1c79356b	120	};
7b1edb79 A	121
7b1edb79 A	122	#define ETHER_DESC_BLK_SIZE (10)
1c79356b A	123	#define MAX_INTERFACES 50
	124
	125	/*
	126	* Statics for demux module
	127	*/
	128
	129	struct ether_desc_blk_str {
7b1edb79 A	130	u_long n_max_used;
	131	u_long n_count;
	132	struct en_desc *block_ptr;
1c79356b A	133	};
	134
	135
	136	static struct ether_desc_blk_str ether_desc_blk[MAX_INTERFACES];
1c79356b A	137
	138
	139	/*
	140	* Release all descriptor entries owned by this dl_tag (there may be several).
7b1edb79	141	* Setting the type to 0 releases the entry. Eventually we should compact-out
1c79356b A	142	* the unused entries.
	143	*/
	144	static
	145	int ether_del_proto(struct if_proto *proto, u_long dl_tag)
	146	{
7b1edb79 A	147	struct en_desc* ed = ether_desc_blk[proto->ifp->family_cookie].block_ptr;
7b1edb79 A	148	u_long current = 0;
1c79356b	149	int found = 0;
7b1edb79 A	150
	151	for (current = ether_desc_blk[proto->ifp->family_cookie].n_max_used;
	152	current > 0; current--) {
	153	if (ed[current - 1].proto == proto) {
	154	found = 1;
	155	ed[current - 1].type = 0;
	156
	157	if (current == ether_desc_blk[proto->ifp->family_cookie].n_max_used) {
	158	ether_desc_blk[proto->ifp->family_cookie].n_max_used--;
	159	}
	160	}
1c79356b	161	}
7b1edb79 A	162
7b1edb79 A	163	return found;
1c79356b A	164	}
	165
	166
	167
7b1edb79 A	168	static int
7b1edb79 A	169	ether_add_proto(struct ddesc_head_str desc_head, struct if_proto proto, u_long dl_tag)
1c79356b A	170	{
	171	char *current_ptr;
	172	struct dlil_demux_desc *desc;
1c79356b	173	struct en_desc *ed;
7b1edb79	174	struct en_desc *last;
1c79356b A	175	u_long *bitmask;
1c79356b A	176	u_long *proto_id;
7b1edb79	177	u_long i;
1c79356b A	178	short total_length;
	179	u_long block_count;
	180	u_long *tmp;
	181
	182
7b1edb79 A	183	TAILQ_FOREACH(desc, desc_head, next) {
	184	switch (desc->type) {
	185	/* These types are supported */
	186	/* Top three are preferred */
	187	case DLIL_DESC_ETYPE2:
	188	if (desc->variants.native_type_length != 2)
	189	return EINVAL;
	190	break;
	191
	192	case DLIL_DESC_SAP:
	193	if (desc->variants.native_type_length != 3)
	194	return EINVAL;
	195	break;
	196
	197	case DLIL_DESC_SNAP:
	198	if (desc->variants.native_type_length != 5)
	199	return EINVAL;
	200	break;
	201
	202	case DLIL_DESC_802_2:
	203	case DLIL_DESC_802_2_SNAP:
	204	break;
	205
	206	case DLIL_DESC_RAW:
	207	if (desc->variants.bitmask.proto_id_length == 0)
	208	break;
	209	/* else fall through, bitmask variant not supported */
	210
	211	default:
	212	ether_del_proto(proto, dl_tag);
	213	return EINVAL;
	214	}
	215
	216	restart:
	217	ed = ether_desc_blk[proto->ifp->family_cookie].block_ptr;
	218
	219	/* Find a free entry */
	220	for (i = 0; i < ether_desc_blk[proto->ifp->family_cookie].n_count; i++) {
	221	if (ed[i].type == 0) {
	222	break;
	223	}
	224	}
	225
	226	if (i >= ether_desc_blk[proto->ifp->family_cookie].n_count) {
	227	u_long new_count = ETHER_DESC_BLK_SIZE +
	228	ether_desc_blk[proto->ifp->family_cookie].n_count;
	229	tmp = _MALLOC((new_count * (sizeof(*ed))), M_IFADDR, M_WAITOK);
	230	if (tmp == 0) {
	231	/*
	232	* Remove any previous descriptors set in the call.
	233	*/
	234	ether_del_proto(proto, dl_tag);
	235	return ENOMEM;
	236	}
	237
	238	bzero(tmp, new_count * sizeof(*ed));
	239	bcopy(ether_desc_blk[proto->ifp->family_cookie].block_ptr,
	240	tmp, ether_desc_blk[proto->ifp->family_cookie].n_count * sizeof(*ed));
	241	FREE(ether_desc_blk[proto->ifp->family_cookie].block_ptr, M_IFADDR);
	242	ether_desc_blk[proto->ifp->family_cookie].n_count = new_count;
	243	ether_desc_blk[proto->ifp->family_cookie].block_ptr = (struct en_desc*)tmp;
	244	}
	245
	246	/* Bump n_max_used if appropriate */
247	if (i + 1 > ether_desc_blk[proto->ifp->family_cookie].n_max_used) {
248	ether_desc_blk[proto->ifp->family_cookie].n_max_used = i + 1;
249	}
250
251	ed[i].proto = proto;
9bccf70c	252	ed[i].data[0] = 0;
7b1edb79 A	253	ed[i].data[1] = 0;
	254
	255	switch (desc->type) {
	256	case DLIL_DESC_RAW:
	257	/* 2 byte ethernet raw protocol type is at native_type */
	258	/* protocol is not in network byte order */
	259	ed[i].type = DLIL_DESC_ETYPE2;
	260	ed[i].data[0] = htons((u_int16_t)desc->native_type);
	261	break;
	262
	263	case DLIL_DESC_ETYPE2:
	264	/* 2 byte ethernet raw protocol type is at native_type */
	265	/* prtocol must be in network byte order */
	266	ed[i].type = DLIL_DESC_ETYPE2;
	267	ed[i].data[0] = (u_int16_t)desc->native_type;
	268	break;
	269
	270	case DLIL_DESC_802_2:
	271	ed[i].type = DLIL_DESC_SAP;
	272	ed[i].data[0] = (u_int32_t)&desc->variants.desc_802_2;
	273	ed[i].data[0] &= htonl(0xFFFFFF00);
	274	break;
	275
	276	case DLIL_DESC_SAP:
	277	ed[i].type = DLIL_DESC_SAP;
	278	bcopy(desc->native_type, &ed[i].data[0], 3);
	279	break;
	280
	281	case DLIL_DESC_802_2_SNAP:
	282	ed[i].type = DLIL_DESC_SNAP;
	283	desc->variants.desc_802_2_SNAP.protocol_type =
	284	htons(desc->variants.desc_802_2_SNAP.protocol_type);
	285	bcopy(&desc->variants.desc_802_2_SNAP, &ed[i].data[0], 8);
	286	ed[i].data[0] &= htonl(0x000000FF);
	287	desc->variants.desc_802_2_SNAP.protocol_type =
	288	ntohs(desc->variants.desc_802_2_SNAP.protocol_type);
	289	break;
	290
	291	case DLIL_DESC_SNAP: {
	292	u_int8_t* pDest = ((u_int8_t*)&ed[i].data[0]) + 3;
	293	ed[i].type = DLIL_DESC_SNAP;
9bccf70c	294	bcopy(desc->native_type, pDest, 5);
7b1edb79 A	295	}
	296	break;
	297	}
	298	}
	299
	300	return 0;
1c79356b A	301	}
	302
	303
	304	static
	305	int ether_shutdown()
	306	{
	307	return 0;
	308	}
	309
	310
1c79356b A	311	int ether_demux(ifp, m, frame_header, proto)
	312	struct ifnet *ifp;
	313	struct mbuf *m;
	314	char *frame_header;
	315	struct if_proto **proto;
	316
	317	{
	318	register struct ether_header eh = (struct ether_header )frame_header;
7b1edb79 A	319	u_short ether_type = eh->ether_type;
	320	u_int16_t type;
	321	u_int8_t *data;
	322	u_long i = 0;
	323	u_long max = ether_desc_blk[ifp->family_cookie].n_max_used;
	324	struct en_desc *ed = ether_desc_blk[ifp->family_cookie].block_ptr;
	325	u_int32_t extProto1 = 0;
	326	u_int32_t extProto2 = 0;
	327
1c79356b	328	if (eh->ether_dhost[0] & 1) {
7b1edb79 A	329	/* Check for broadcast */
	330	if ((u_int32_t)eh->ether_dhost == 0xFFFFFFFF &&
	331	(u_int16_t)(eh->ether_dhost + sizeof(u_int32_t)) == 0xFFFF)
	332	m->m_flags \|= M_BCAST;
	333	else
	334	m->m_flags \|= M_MCAST;
90556fb8 A	335	} else {
	336	/*
	337	* When the driver is put into promiscuous mode we may receive unicast
	338	* frames that are not intended for our interfaces. They are filtered
	339	* here to keep them from traveling further up the stack to code that
	340	* is not expecting them or prepared to deal with them. In the near
	341	* future, the filtering done here will be moved even further down the
	342	* stack into the IONetworkingFamily, preventing even interface
	343	* filter NKE's from receiving promiscuous packets. Please use BPF.
	344	*/
	345	#define ETHER_CMP(x, y) ( ((u_int16_t ) x)[0] != ((u_int16_t ) y)[0] \|\| \
	346	((u_int16_t ) x)[1] != ((u_int16_t ) y)[1] \|\| \
	347	((u_int16_t ) x)[2] != ((u_int16_t ) y)[2] )
	348
	349	if (ETHER_CMP(eh->ether_dhost, ((struct arpcom *) ifp)->ac_enaddr)) {
	350	m_freem(m);
	351	return EJUSTRETURN;
	352	}
1c79356b	353	}
7b1edb79 A	354
	355	data = mtod(m, u_int8_t*);
	356
	357	/*
	358	* Determine the packet's protocol type and stuff the protocol into
	359	* longs for quick compares.
	360	*/
	361
9bccf70c	362	if (ntohs(ether_type) <= 1500) {
7b1edb79 A	363	extProto1 = (u_int32_t)data;
	364
	365	// SAP or SNAP
	366	if ((extProto1 & htonl(0xFFFFFF00)) == htonl(0xAAAA0300)) {
	367	// SNAP
	368	type = DLIL_DESC_SNAP;
	369	extProto2 = (u_int32_t)(data + sizeof(u_int32_t));
	370	extProto1 &= htonl(0x000000FF);
	371	} else {
	372	type = DLIL_DESC_SAP;
	373	extProto1 &= htonl(0xFFFFFF00);
	374	}
	375	} else {
	376	type = DLIL_DESC_ETYPE2;
	377	}
	378
1c79356b A	379	/*
	380	* Search through the connected protocols for a match.
	381	*/
7b1edb79 A	382
	383	switch (type) {
	384	case DLIL_DESC_ETYPE2:
	385	for (i = 0; i < max; i++) {
	386	if ((ed[i].type == type) && (ed[i].data[0] == ether_type)) {
	387	*proto = ed[i].proto;
	388	return 0;
	389	}
	390	}
	391	break;
	392
	393	case DLIL_DESC_SAP:
	394	for (i = 0; i < max; i++) {
	395	if ((ed[i].type == type) && (ed[i].data[0] == extProto1)) {
	396	*proto = ed[i].proto;
	397	return 0;
	398	}
	399	}
	400	break;
	401
	402	case DLIL_DESC_SNAP:
	403	for (i = 0; i < max; i++) {
	404	if ((ed[i].type == type) && (ed[i].data[0] == extProto1) &&
	405	(ed[i].data[1] == extProto2)) {
	406	*proto = ed[i].proto;
	407	return 0;
	408	}
	409	}
	410	break;
1c79356b	411	}
7b1edb79	412
1c79356b A	413	return ENOENT;
	414	}
	415
	416
	417
	418	/*
	419	* Ethernet output routine.
	420	* Encapsulate a packet of type family for the local net.
	421	* Use trailer local net encapsulation if enough data in first
	422	* packet leaves a multiple of 512 bytes of data in remainder.
	423	* Assumes that ifp is actually pointer to arpcom structure.
	424	*/
	425	int
	426	ether_frameout(ifp, m, ndest, edst, ether_type)
	427	register struct ifnet *ifp;
	428	struct mbuf **m;
	429	struct sockaddr *ndest;
	430	char *edst;
	431	char *ether_type;
	432	{
	433	register struct ether_header *eh;
	434	int hlen; /* link layer header lenght */
	435	struct arpcom *ac = IFP2AC(ifp);
	436
	437
	438	hlen = ETHER_HDR_LEN;
	439
	440	/*
	441	* If a simplex interface, and the packet is being sent to our
	442	* Ethernet address or a broadcast address, loopback a copy.
	443	* XXX To make a simplex device behave exactly like a duplex
	444	* device, we should copy in the case of sending to our own
	445	* ethernet address (thus letting the original actually appear
	446	* on the wire). However, we don't do that here for security
	447	* reasons and compatibility with the original behavior.
	448	*/
	449	if ((ifp->if_flags & IFF_SIMPLEX) &&
	450	((*m)->m_flags & M_LOOP)) {
	451	if (lo_dlt == 0)
7b1edb79	452	dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dlt);
1c79356b A	453
1c79356b A	454	if (lo_dlt) {
7b1edb79 A	455	if ((*m)->m_flags & M_BCAST) {
	456	struct mbuf n = m_copy(m, 0, (int)M_COPYALL);
	457	if (n != NULL)
	458	dlil_output(lo_dlt, n, 0, ndest, 0);
	459	}
	460	else
	461	{
	462	if (bcmp(edst, ac->ac_enaddr, ETHER_ADDR_LEN) == 0) {
	463	dlil_output(lo_dlt, *m, 0, ndest, 0);
	464	return EJUSTRETURN;
	465	}
	466	}
1c79356b A	467	}
1c79356b A	468	}
7b1edb79 A	469
7b1edb79 A	470
1c79356b A	471	/*
	472	* Add local net header. If no space in first mbuf,
	473	* allocate another.
	474	*/
	475	M_PREPEND(*m, sizeof (struct ether_header), M_DONTWAIT);
	476	if (*m == 0) {
	477	return (EJUSTRETURN);
	478	}
	479
	480
	481	eh = mtod(m, struct ether_header );
	482	(void)memcpy(&eh->ether_type, ether_type,
	483	sizeof(eh->ether_type));
	484	(void)memcpy(eh->ether_dhost, edst, 6);
	485	(void)memcpy(eh->ether_shost, ac->ac_enaddr,
	486	sizeof(eh->ether_shost));
	487
	488	return 0;
	489	}
	490
	491
	492	static
	493	int ether_add_if(struct ifnet *ifp)
	494	{
	495	u_long i;
	496
	497	ifp->if_framer = ether_frameout;
	498	ifp->if_demux = ether_demux;
	499	ifp->if_event = 0;
	500
	501	for (i=0; i < MAX_INTERFACES; i++)
7b1edb79 A	502	if (ether_desc_blk[i].n_count == 0)
7b1edb79 A	503	break;
1c79356b A	504
1c79356b A	505	if (i == MAX_INTERFACES)
7b1edb79	506	return ENOMEM;
1c79356b	507
7b1edb79 A	508	ether_desc_blk[i].block_ptr = _MALLOC(ETHER_DESC_BLK_SIZE * sizeof(struct en_desc),
7b1edb79 A	509	M_IFADDR, M_WAITOK);
1c79356b	510	if (ether_desc_blk[i].block_ptr == 0)
7b1edb79	511	return ENOMEM;
1c79356b	512
7b1edb79 A	513	ether_desc_blk[i].n_count = ETHER_DESC_BLK_SIZE;
7b1edb79 A	514	bzero(ether_desc_blk[i].block_ptr, ETHER_DESC_BLK_SIZE * sizeof(struct en_desc));
1c79356b A	515
	516	ifp->family_cookie = i;
	517
	518	return 0;
	519	}
	520
	521	static
	522	int ether_del_if(struct ifnet *ifp)
	523	{
	524	if ((ifp->family_cookie < MAX_INTERFACES) &&
7b1edb79 A	525	(ether_desc_blk[ifp->family_cookie].n_count))
	526	{
	527	FREE(ether_desc_blk[ifp->family_cookie].block_ptr, M_IFADDR);
	528	ether_desc_blk[ifp->family_cookie].block_ptr = NULL;
	529	ether_desc_blk[ifp->family_cookie].n_count = 0;
	530	ether_desc_blk[ifp->family_cookie].n_max_used = 0;
	531	return 0;
1c79356b A	532	}
1c79356b A	533	else
7b1edb79	534	return ENOENT;
1c79356b A	535	}
1c79356b A	536
9bccf70c A	537	static
	538	int ether_init_if(struct ifnet *ifp)
	539	{
	540	register struct ifaddr *ifa;
	541	register struct sockaddr_dl *sdl;
	542
	543	ifa = ifnet_addrs[ifp->if_index - 1];
	544	if (ifa == 0) {
	545	printf("ether_ifattach: no lladdr!\n");
	546	return;
	547	}
	548	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
	549	sdl->sdl_type = IFT_ETHER;
	550	sdl->sdl_alen = ifp->if_addrlen;
	551	bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
	552
	553	return 0;
	554	}
1c79356b A	555
	556
	557	int
	558	ether_ifmod_ioctl(ifp, command, data)
	559	struct ifnet *ifp;
	560	u_long command;
	561	caddr_t data;
	562	{
	563	struct rslvmulti_req rsreq = (struct rslvmulti_req ) data;
	564	int error = 0;
	565	struct sockaddr_dl *sdl;
	566	struct sockaddr_in *sin;
	567	u_char *e_addr;
	568
	569
7b1edb79 A	570	switch (command) {
	571	case SIOCRSLVMULTI:
	572	switch(rsreq->sa->sa_family) {
	573	case AF_UNSPEC:
	574	/* AppleTalk uses AF_UNSPEC for multicast registration.
	575	* No mapping needed. Just check that it's a valid MC address.
	576	*/
	577	e_addr = &rsreq->sa->sa_data[0];
	578	if ((e_addr[0] & 1) != 1)
	579	return EADDRNOTAVAIL;
	580	*rsreq->llsa = 0;
	581	return EJUSTRETURN;
	582
	583
	584	case AF_LINK:
	585	/*
	586	* No mapping needed. Just check that it's a valid MC address.
	587	*/
	588	sdl = (struct sockaddr_dl *)rsreq->sa;
	589	e_addr = LLADDR(sdl);
	590	if ((e_addr[0] & 1) != 1)
	591	return EADDRNOTAVAIL;
	592	*rsreq->llsa = 0;
	593	return EJUSTRETURN;
	594
	595	default:
	596	return EAFNOSUPPORT;
	597	}
	598
	599	default:
	600	return EOPNOTSUPP;
1c79356b A	601	}
	602	}
	603
	604
	605	int ether_family_init()
	606	{
	607	int i;
	608	struct dlil_ifmod_reg_str ifmod_reg;
	609
9bccf70c A	610	/* ethernet family is built-in, called from bsd_init */
9bccf70c A	611	thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
1c79356b	612
9bccf70c	613	bzero(&ifmod_reg, sizeof(ifmod_reg));
1c79356b A	614	ifmod_reg.add_if = ether_add_if;
1c79356b A	615	ifmod_reg.del_if = ether_del_if;
9bccf70c	616	ifmod_reg.init_if = ether_init_if;
1c79356b A	617	ifmod_reg.add_proto = ether_add_proto;
	618	ifmod_reg.del_proto = ether_del_proto;
	619	ifmod_reg.ifmod_ioctl = ether_ifmod_ioctl;
	620	ifmod_reg.shutdown = ether_shutdown;
	621
	622	if (dlil_reg_if_modules(APPLE_IF_FAM_ETHERNET, &ifmod_reg)) {
7b1edb79 A	623	printf("WARNING: ether_family_init -- Can't register if family modules\n");
7b1edb79 A	624	return EIO;
1c79356b A	625	}
1c79356b A	626
1c79356b	627	for (i=0; i < MAX_INTERFACES; i++)
7b1edb79	628	ether_desc_blk[i].n_count = 0;
1c79356b	629
9bccf70c A	630	thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
9bccf70c A	631
1c79356b A	632	return 0;
1c79356b A	633	}