[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>

/*
#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;
static ivedonethis = 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;
    }
    
    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;
}


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;

    if (ivedonethis)
        return 0;

    ivedonethis = 1;

    ifmod_reg.add_if = ether_add_if;
    ifmod_reg.del_if = ether_del_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;

    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	*
	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.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	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.
	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 A	73	#include <netinet/if_ether.h>
	74
	75	/*
	76	#if INET
	77	#include <netinet/in.h>
	78	#include <netinet/in_var.h>
	79
	80	#include <netinet/in_systm.h>
	81	#include <netinet/ip.h>
	82	#endif
	83	*/
	84
	85	#include <sys/socketvar.h>
	86
	87	#include <net/dlil.h>
	88
	89
	90	#if LLC && CCITT
	91	extern struct ifqueue pkintrq;
	92	#endif
	93
	94	/* General stuff from if_ethersubr.c - may not need some of it */
	95
	96	#include <netat/at_pat.h>
	97	#if NETAT
	98	extern struct ifqueue atalkintrq;
	99	#endif
	100
	101
	102	#if BRIDGE
	103	#include <net/bridge.h>
	104	#endif
	105
	106	/* #include "vlan.h" */
	107	#if NVLAN > 0
	108	#include <net/if_vlan_var.h>
	109	#endif /* NVLAN > 0 */
	110
	111	static u_long lo_dlt = 0;
	112	static ivedonethis = 0;
	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;
252	ed[i].data[0] = 0;
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;
294	bcopy(&desc->native_type, pDest, 5);
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;
1c79356b	335	}
7b1edb79 A	336
	337	data = mtod(m, u_int8_t*);
	338
	339	/*
	340	* Determine the packet's protocol type and stuff the protocol into
	341	* longs for quick compares.
	342	*/
	343
	344	if (ntohs(ether_type) < 1500) {
	345	extProto1 = (u_int32_t)data;
	346
	347	// SAP or SNAP
	348	if ((extProto1 & htonl(0xFFFFFF00)) == htonl(0xAAAA0300)) {
	349	// SNAP
	350	type = DLIL_DESC_SNAP;
	351	extProto2 = (u_int32_t)(data + sizeof(u_int32_t));
	352	extProto1 &= htonl(0x000000FF);
	353	} else {
	354	type = DLIL_DESC_SAP;
	355	extProto1 &= htonl(0xFFFFFF00);
	356	}
	357	} else {
	358	type = DLIL_DESC_ETYPE2;
	359	}
	360
1c79356b A	361	/*
	362	* Search through the connected protocols for a match.
	363	*/
7b1edb79 A	364
	365	switch (type) {
	366	case DLIL_DESC_ETYPE2:
	367	for (i = 0; i < max; i++) {
	368	if ((ed[i].type == type) && (ed[i].data[0] == ether_type)) {
	369	*proto = ed[i].proto;
	370	return 0;
	371	}
	372	}
	373	break;
	374
	375	case DLIL_DESC_SAP:
	376	for (i = 0; i < max; i++) {
	377	if ((ed[i].type == type) && (ed[i].data[0] == extProto1)) {
	378	*proto = ed[i].proto;
	379	return 0;
	380	}
	381	}
	382	break;
	383
	384	case DLIL_DESC_SNAP:
	385	for (i = 0; i < max; i++) {
	386	if ((ed[i].type == type) && (ed[i].data[0] == extProto1) &&
	387	(ed[i].data[1] == extProto2)) {
	388	*proto = ed[i].proto;
	389	return 0;
	390	}
	391	}
	392	break;
1c79356b	393	}
7b1edb79	394
1c79356b A	395	return ENOENT;
	396	}
	397
	398
	399
	400	/*
	401	* Ethernet output routine.
	402	* Encapsulate a packet of type family for the local net.
	403	* Use trailer local net encapsulation if enough data in first
	404	* packet leaves a multiple of 512 bytes of data in remainder.
	405	* Assumes that ifp is actually pointer to arpcom structure.
	406	*/
	407	int
	408	ether_frameout(ifp, m, ndest, edst, ether_type)
	409	register struct ifnet *ifp;
	410	struct mbuf **m;
	411	struct sockaddr *ndest;
	412	char *edst;
	413	char *ether_type;
	414	{
	415	register struct ether_header *eh;
	416	int hlen; /* link layer header lenght */
	417	struct arpcom *ac = IFP2AC(ifp);
	418
	419
	420	hlen = ETHER_HDR_LEN;
	421
	422	/*
	423	* If a simplex interface, and the packet is being sent to our
	424	* Ethernet address or a broadcast address, loopback a copy.
	425	* XXX To make a simplex device behave exactly like a duplex
	426	* device, we should copy in the case of sending to our own
	427	* ethernet address (thus letting the original actually appear
	428	* on the wire). However, we don't do that here for security
	429	* reasons and compatibility with the original behavior.
	430	*/
	431	if ((ifp->if_flags & IFF_SIMPLEX) &&
	432	((*m)->m_flags & M_LOOP)) {
	433	if (lo_dlt == 0)
7b1edb79	434	dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dlt);
1c79356b A	435
1c79356b A	436	if (lo_dlt) {
7b1edb79 A	437	if ((*m)->m_flags & M_BCAST) {
	438	struct mbuf n = m_copy(m, 0, (int)M_COPYALL);
	439	if (n != NULL)
	440	dlil_output(lo_dlt, n, 0, ndest, 0);
	441	}
	442	else
	443	{
	444	if (bcmp(edst, ac->ac_enaddr, ETHER_ADDR_LEN) == 0) {
	445	dlil_output(lo_dlt, *m, 0, ndest, 0);
	446	return EJUSTRETURN;
	447	}
	448	}
1c79356b A	449	}
1c79356b A	450	}
7b1edb79 A	451
7b1edb79 A	452
1c79356b A	453	/*
	454	* Add local net header. If no space in first mbuf,
	455	* allocate another.
	456	*/
	457	M_PREPEND(*m, sizeof (struct ether_header), M_DONTWAIT);
	458	if (*m == 0) {
	459	return (EJUSTRETURN);
	460	}
	461
	462
	463	eh = mtod(m, struct ether_header );
	464	(void)memcpy(&eh->ether_type, ether_type,
	465	sizeof(eh->ether_type));
	466	(void)memcpy(eh->ether_dhost, edst, 6);
	467	(void)memcpy(eh->ether_shost, ac->ac_enaddr,
	468	sizeof(eh->ether_shost));
	469
	470	return 0;
	471	}
	472
	473
	474	static
	475	int ether_add_if(struct ifnet *ifp)
	476	{
	477	u_long i;
	478
	479	ifp->if_framer = ether_frameout;
	480	ifp->if_demux = ether_demux;
	481	ifp->if_event = 0;
	482
	483	for (i=0; i < MAX_INTERFACES; i++)
7b1edb79 A	484	if (ether_desc_blk[i].n_count == 0)
7b1edb79 A	485	break;
1c79356b A	486
1c79356b A	487	if (i == MAX_INTERFACES)
7b1edb79	488	return ENOMEM;
1c79356b	489
7b1edb79 A	490	ether_desc_blk[i].block_ptr = _MALLOC(ETHER_DESC_BLK_SIZE * sizeof(struct en_desc),
7b1edb79 A	491	M_IFADDR, M_WAITOK);
1c79356b	492	if (ether_desc_blk[i].block_ptr == 0)
7b1edb79	493	return ENOMEM;
1c79356b	494
7b1edb79 A	495	ether_desc_blk[i].n_count = ETHER_DESC_BLK_SIZE;
7b1edb79 A	496	bzero(ether_desc_blk[i].block_ptr, ETHER_DESC_BLK_SIZE * sizeof(struct en_desc));
1c79356b A	497
	498	ifp->family_cookie = i;
	499
	500	return 0;
	501	}
	502
	503	static
	504	int ether_del_if(struct ifnet *ifp)
	505	{
	506	if ((ifp->family_cookie < MAX_INTERFACES) &&
7b1edb79 A	507	(ether_desc_blk[ifp->family_cookie].n_count))
	508	{
	509	FREE(ether_desc_blk[ifp->family_cookie].block_ptr, M_IFADDR);
	510	ether_desc_blk[ifp->family_cookie].block_ptr = NULL;
	511	ether_desc_blk[ifp->family_cookie].n_count = 0;
	512	ether_desc_blk[ifp->family_cookie].n_max_used = 0;
	513	return 0;
1c79356b A	514	}
1c79356b A	515	else
7b1edb79	516	return ENOENT;
1c79356b A	517	}
	518
	519
	520
	521	int
	522	ether_ifmod_ioctl(ifp, command, data)
	523	struct ifnet *ifp;
	524	u_long command;
	525	caddr_t data;
	526	{
	527	struct rslvmulti_req rsreq = (struct rslvmulti_req ) data;
	528	int error = 0;
	529	struct sockaddr_dl *sdl;
	530	struct sockaddr_in *sin;
	531	u_char *e_addr;
	532
	533
7b1edb79 A	534	switch (command) {
	535	case SIOCRSLVMULTI:
	536	switch(rsreq->sa->sa_family) {
	537	case AF_UNSPEC:
	538	/* AppleTalk uses AF_UNSPEC for multicast registration.
	539	* No mapping needed. Just check that it's a valid MC address.
	540	*/
	541	e_addr = &rsreq->sa->sa_data[0];
	542	if ((e_addr[0] & 1) != 1)
	543	return EADDRNOTAVAIL;
	544	*rsreq->llsa = 0;
	545	return EJUSTRETURN;
	546
	547
	548	case AF_LINK:
	549	/*
	550	* No mapping needed. Just check that it's a valid MC address.
	551	*/
	552	sdl = (struct sockaddr_dl *)rsreq->sa;
	553	e_addr = LLADDR(sdl);
	554	if ((e_addr[0] & 1) != 1)
	555	return EADDRNOTAVAIL;
	556	*rsreq->llsa = 0;
	557	return EJUSTRETURN;
	558
	559	default:
	560	return EAFNOSUPPORT;
	561	}
	562
	563	default:
	564	return EOPNOTSUPP;
1c79356b A	565	}
	566	}
	567
	568
	569	int ether_family_init()
	570	{
	571	int i;
	572	struct dlil_ifmod_reg_str ifmod_reg;
	573
	574	if (ivedonethis)
7b1edb79	575	return 0;
1c79356b A	576
	577	ivedonethis = 1;
	578
	579	ifmod_reg.add_if = ether_add_if;
	580	ifmod_reg.del_if = ether_del_if;
	581	ifmod_reg.add_proto = ether_add_proto;
	582	ifmod_reg.del_proto = ether_del_proto;
	583	ifmod_reg.ifmod_ioctl = ether_ifmod_ioctl;
	584	ifmod_reg.shutdown = ether_shutdown;
	585
	586	if (dlil_reg_if_modules(APPLE_IF_FAM_ETHERNET, &ifmod_reg)) {
7b1edb79 A	587	printf("WARNING: ether_family_init -- Can't register if family modules\n");
7b1edb79 A	588	return EIO;
1c79356b A	589	}
1c79356b A	590
1c79356b	591	for (i=0; i < MAX_INTERFACES; i++)
7b1edb79	592	ether_desc_blk[i].n_count = 0;
1c79356b A	593
	594	return 0;
	595	}