bsd/netat/drv_dep.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright 1994 Apple Computer, Inc.
  32  * All Rights Reserved.
  33  *
  34  * Tuyen A. Nguyen. (December 5, 1994)
  35  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  36  */
  37
  38 #include <sys/errno.h>
  39 #include <sys/types.h>
  40 #include <sys/param.h>
  41 #include <machine/spl.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/proc.h>
  45 #include <sys/filedesc.h>
  46 #include <sys/fcntl.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/malloc.h>
  50 #include <sys/socket.h>
  51 #include <sys/socketvar.h>
  52 #include <sys/sockio.h>
  53
  54 #include <net/if.h>
  55 #include <net/if_types.h>
  56 #include <net/if_dl.h>
  57 #include <net/ethernet.h>
  58
  59 #include <netat/sysglue.h>
  60 #include <netat/appletalk.h>
  61 #include <netat/at_pcb.h>
  62 #include <netat/at_var.h>
  63 #include <netat/ddp.h>
  64 #include <netat/at_aarp.h>
  65 #include <netat/at_pat.h>
  66 #include <netat/debug.h>
  67
  68 #define DSAP_SNAP 0xaa
  69
  70 extern void gref_init(), atp_init(), atp_link(), atp_unlink();
  71
  72 extern int adspInited;
  73
  74 static llc_header_t     snap_hdr_at = SNAP_HDR_AT;
  75 static llc_header_t     snap_hdr_aarp = SNAP_HDR_AARP;
  76 static unsigned char snap_proto_ddp[5] = SNAP_PROTO_AT;
  77 static unsigned char snap_proto_aarp[5] = SNAP_PROTO_AARP;
  78
  79 static void at_input_packet(protocol_family_t protocol, mbuf_t m);
  80
  81 int pktsIn, pktsOut;
  82
  83 struct ifqueue atalkintrq;      /* appletalk and aarp packet input queue */
  84
  85 short appletalk_inited = 0;
  86
  87
  88
  89 void atalk_load()
  90 {
  91         extern lck_mtx_t *domain_proto_mtx;
  92
  93
  94         atp_init();
  95         atp_link();
  96         adspInited = 0;
  97
  98 /*      adsp_init();
  99                 for 2225395
 100                 this happens in adsp_open and is undone on ADSP_UNLINK
 101 */
 102         lck_mtx_unlock(domain_proto_mtx);
 103         proto_register_input(PF_APPLETALK, at_input_packet, NULL);
 104         lck_mtx_lock(domain_proto_mtx);
 105 } /* atalk_load */
 106
 107 /* Undo everything atalk_load() did. */
 108 void atalk_unload()  /* not currently used */
 109 {
 110         extern gbuf_t *scb_resource_m;
 111         extern gbuf_t *atp_resource_m;
 112
 113         atp_unlink();
 114
 115 #ifdef NOT_YET
 116         if (scb_resource_m) {
 117                 gbuf_freem(scb_resource_m);
 118                 scb_resource_m = 0;
 119                 scb_free_list = 0;
 120         }
 121         /* allocated in atp_trans_alloc() */
 122         if (atp_resource_m) {
 123                 gbuf_freem(atp_resource_m);
 124                 atp_resource_m = 0;
 125                 atp_trans_free_list = 0;
 126         }
 127 #endif
 128
 129         appletalk_inited = 0;
 130 } /* atalk_unload */
 131
 132 void appletalk_hack_start()
 133 {
 134         if (!appletalk_inited) {
 135                 atalk_load();
 136                 atalkintrq.ifq_maxlen = IFQ_MAXLEN;
 137                 appletalk_inited = 1;
 138         }
 139 } /* appletalk_hack_start */
 140
 141 int pat_output(patp, mlist, dst_addr, type)
 142         at_ifaddr_t *patp;
 143         struct mbuf *mlist;                     /* packet chain */
 144         unsigned char *dst_addr;        /* for atalk addr - net # must be in network byte order */
 145         int     type;
 146 {
 147         struct mbuf *m, *m1;
 148         llc_header_t *llc_header;
 149         struct sockaddr dst;
 150
 151         if (! patp->aa_ifp) {
 152                 for (m = mlist; m; m = mlist) {
 153                         mlist = m->m_nextpkt;
 154                         m->m_nextpkt = 0;
 155                         m_freem(m);
 156                 }
 157                 return ENOTREADY;
 158         }
 159
 160         /* this is for ether_output */
 161         dst.sa_family = AF_APPLETALK;
 162         dst.sa_len = 2 + sizeof(struct etalk_addr);
 163         bcopy (dst_addr, &dst.sa_data[0], sizeof(struct etalk_addr));
 164
 165         /* packet chains are used on output and can be tested using aufs */
 166         for (m = mlist; m; m = mlist) {
 167                 mlist = m->m_nextpkt;
 168                 m->m_nextpkt = 0;
 169
 170                 M_PREPEND(m, sizeof(llc_header_t), M_DONTWAIT);
 171                 if (m == 0) {
 172                         continue;
 173                 }
 174
 175                 llc_header = mtod(m, llc_header_t *);
 176                 *llc_header =
 177                   (type == AARP_AT_TYPE) ? snap_hdr_aarp : snap_hdr_at;
 178
 179                 for (m->m_pkthdr.len = 0, m1 = m; m1; m1 = m1->m_next)
 180                         m->m_pkthdr.len += m1->m_len;
 181                 m->m_pkthdr.rcvif = 0;
 182
 183                 /* *** Note: AT is sending out mbufs of type MSG_DATA,
 184                    not MT_DATA.  *** */
 185 #ifdef APPLETALK_DEBUG
 186                 if (m->m_next &&
 187                     !((m->m_next)->m_flags & M_EXT))
 188                         kprintf("po: mlen= %d, m2len= %d\n", m->m_len,
 189                                 (m->m_next)->m_len);
 190 #endif
 191                 atalk_unlock();
 192                 dlil_output(patp->aa_ifp, PF_APPLETALK, m, NULL, &dst, 0);
 193                 atalk_lock();
 194
 195                 pktsOut++;
 196         }
 197
 198         return 0;
 199 } /* pat_output */
 200
 201 static void
 202 at_input_packet(
 203         __unused protocol_family_t      protocol,
 204         mbuf_t                                          m)
 205 {
 206         struct mbuf *m1;
 207         struct ifnet *ifp;
 208         llc_header_t *llc_header;
 209         at_ifaddr_t *ifID;
 210         char src[6];
 211         enet_header_t *enet_header;
 212
 213         if (!appletalk_inited) {
 214                 m_freem(m);
 215                 return;
 216         }
 217
 218         if ((m->m_flags & M_PKTHDR) == 0) {
 219 #ifdef APPLETALK_DEBUG
 220                 kprintf("atalkintr: no HDR on packet received");
 221 #endif
 222                 m_freem(m);
 223                 return;
 224         }
 225
 226           /* make sure the interface this packet was received on is configured
 227              for AppleTalk */
 228           ifp = m->m_pkthdr.rcvif;
 229           TAILQ_FOREACH(ifID, &at_ifQueueHd, aa_link) {
 230                 if (ifID->aa_ifp && (ifID->aa_ifp == ifp))
 231                         break;
 232           }
 233           /* if we didn't find a matching interface */
 234           if (!ifID) {
 235                 m_freem(m);
 236                 return; /* was EAFNOSUPPORT */
 237           }
 238
 239           /* make sure the entire packet header is in the current mbuf */
 240           if (m->m_len < ENET_LLC_SIZE &&
 241               (m = m_pullup(m, ENET_LLC_SIZE)) == 0) {
 242 #ifdef APPLETALK_DEBUG
 243                 kprintf("atalkintr: packet too small\n");
 244 #endif
 245                 m_freem(m);
 246                 return;
 247           }
 248           enet_header = mtod(m, enet_header_t *);
 249
 250           /* Ignore multicast packets from local station */
 251           /* *** Note: code for IFTYPE_TOKENTALK may be needed here. *** */
 252           if (ifID->aa_ifp->if_type == IFT_ETHER ||
 253                 ifID->aa_ifp->if_type == IFT_L2VLAN ||
 254                 ifID->aa_ifp->if_type == IFT_IEEE8023ADLAG) {
 255                 bcopy((char *)enet_header->src, src, sizeof(src));
 256
 257 #ifdef COMMENT  /* In order to receive packets from the Blue Box, we cannot
 258                    reject packets whose source address matches our local address.
 259                 */
 260                 if ((enet_header->dst[0] & 1) &&
 261                     (bcmp(src, ifID->xaddr, sizeof(src)) == 0)) {
 262                   /* Packet rejected: think it's a local mcast. */
 263                   m_freem(m);
 264                   return; /* was EAFNOSUPPORT */
 265                 }
 266 #endif /* COMMENT */
 267
 268                 llc_header = (llc_header_t *)(enet_header+1);
 269
 270                 /* advance the mbuf pointers past the ethernet header */
 271                 m->m_data += ENET_LLC_SIZE;
 272                 m->m_len -= ENET_LLC_SIZE;
 273
 274                 pktsIn++;
 275
 276                 if (LLC_PROTO_EQUAL(llc_header->protocol,snap_proto_aarp)) {
 277                         (void)aarp_rcv_pkt(mtod(m, aarp_pkt_t *), ifID);
 278                         m_freem(m);
 279                 }
 280                 else if (LLC_PROTO_EQUAL(llc_header->protocol, snap_proto_ddp)) {
 281                         /* if we're a router take all pkts */
 282                         if (!ROUTING_MODE) {
 283                           if (aarp_chk_addr(mtod(m, at_ddp_t  *), ifID)
 284                               == AARP_ERR_NOT_OURS) {
 285 #ifdef APPLETALK_DEBUG
 286                             kprintf("pat_input: Packet Rejected: not for us? dest=%x.%x.%x.%x.%x.%x LLC_PROTO= %02x%02x\n",
 287                                     enet_header->dst[0], enet_header->dst[1],
 288                                     enet_header->dst[2], enet_header->dst[3],
 289                                     enet_header->dst[4], enet_header->dst[5],
 290                                     llc_header->protocol[3],
 291                                     llc_header->protocol[4]);
 292 #endif
 293                             m_freem(m);
 294                             return; /* was EAFNOSUPPORT */
 295                           }
 296                         }
 297                         MCHTYPE(m, MSG_DATA); /* set the mbuf type */
 298
 299                         ifID->stats.rcv_packets++;
 300                         for (m1 = m; m1; m1 = m1->m_next)
 301                                 ifID->stats.rcv_bytes += m1->m_len;
 302
 303                         if (!MULTIPORT_MODE)
 304                                 ddp_glean(m, ifID, src);
 305
 306                         ddp_input(m, ifID);
 307                 } else {
 308 #ifdef APPLETALK_DEBUG
 309                         kprintf("pat_input: Packet Rejected: wrong LLC_PROTO = %02x%02x\n",
 310                                 llc_header->protocol[3],
 311                                 llc_header->protocol[4]);
 312 #endif
 313                         m_freem(m);
 314                 }
 315         }
 316 }