bsd/netat/drv_dep.c

   1 /*
   2  * Copyright (c) 2000-2012 Apple, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_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 License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright 1994 Apple Computer, Inc.
  30  * All Rights Reserved.
  31  *
  32  * Tuyen A. Nguyen. (December 5, 1994)
  33  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  34  */
  35
  36 #include <sys/errno.h>
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <machine/spl.h>
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/proc.h>
  43 #include <sys/filedesc.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/malloc.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <sys/sockio.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_types.h>
  54 #include <net/if_dl.h>
  55 #include <net/dlil.h>
  56 #include <net/ethernet.h>
  57 #include <net/kpi_protocol.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/atp.h>
  67 #include <netat/debug.h>
  68
  69 #define DSAP_SNAP 0xaa
  70
  71 extern int adspInited;
  72
  73 static llc_header_t     snap_hdr_at = SNAP_HDR_AT;
  74 static llc_header_t     snap_hdr_aarp = SNAP_HDR_AARP;
  75 static unsigned char snap_proto_ddp[5] = SNAP_PROTO_AT;
  76 static unsigned char snap_proto_aarp[5] = SNAP_PROTO_AARP;
  77
  78 static void at_input_packet(protocol_family_t protocol, mbuf_t m);
  79
  80 struct ifqueue atalkintrq;      /* appletalk and aarp packet input queue */
  81
  82 short appletalk_inited = 0;
  83
  84 void atalk_load(void);
  85 void atalk_unload(void);
  86
  87 extern int pktsIn, pktsOut;
  88
  89
  90 void atalk_load()
  91 {
  92         atp_init();
  93         atp_link();
  94         adspInited = 0;
  95
  96 /*      adsp_init();
  97                 for 2225395
  98                 this happens in adsp_open and is undone on ADSP_UNLINK
  99 */
 100         domain_proto_mtx_unlock(TRUE);
 101         proto_register_input(PF_APPLETALK, at_input_packet, NULL, 0);
 102         domain_proto_mtx_lock();
 103 } /* atalk_load */
 104
 105 /* Undo everything atalk_load() did. */
 106 void atalk_unload()  /* not currently used */
 107 {
 108         atp_unlink();
 109
 110 #ifdef NOT_YET
 111         {
 112                 extern gbuf_t *scb_resource_m;
 113                 extern gbuf_t *atp_resource_m;
 114                 if (scb_resource_m) {
 115                         gbuf_freem(scb_resource_m);
 116                         scb_resource_m = 0;
 117                         scb_free_list = 0;
 118                 }
 119                 /* allocated in atp_trans_alloc() */
 120                 if (atp_resource_m) {
 121                         gbuf_freem(atp_resource_m);
 122                         atp_resource_m = 0;
 123                         atp_trans_free_list = 0;
 124                 }
 125         }
 126 #endif
 127
 128         appletalk_inited = 0;
 129 } /* atalk_unload */
 130
 131 void appletalk_hack_start(void)
 132 {
 133         if (!appletalk_inited) {
 134                 atalk_load();
 135                 atalkintrq.ifq_maxlen = IFQ_MAXLEN;
 136                 appletalk_inited = 1;
 137         }
 138 } /* appletalk_hack_start */
 139
 140 int pat_output(patp, mlist, dst_addr, type)
 141         at_ifaddr_t *patp;
 142         struct mbuf *mlist;                     /* packet chain */
 143         unsigned char *dst_addr;        /* for atalk addr - net # must be in network byte order */
 144         int     type;
 145 {
 146         struct mbuf *m, *m1;
 147         llc_header_t *llc_header;
 148         struct sockaddr dst;
 149
 150         if (! patp->aa_ifp) {
 151                 for (m = mlist; m; m = mlist) {
 152                         mlist = m->m_nextpkt;
 153                         m->m_nextpkt = 0;
 154                         m_freem(m);
 155                 }
 156                 return ENOTREADY;
 157         }
 158
 159         /* this is for ether_output */
 160         dst.sa_family = AF_APPLETALK;
 161         dst.sa_len = 2 + sizeof(struct etalk_addr);
 162         bcopy (dst_addr, &dst.sa_data[0], sizeof(struct etalk_addr));
 163
 164         /* packet chains are used on output and can be tested using aufs */
 165         for (m = mlist; m; m = mlist) {
 166                 mlist = m->m_nextpkt;
 167                 m->m_nextpkt = 0;
 168
 169                 M_PREPEND(m, sizeof(llc_header_t), M_DONTWAIT);
 170                 if (m == 0) {
 171                         continue;
 172                 }
 173
 174                 llc_header = mtod(m, llc_header_t *);
 175                 *llc_header =
 176                   (type == AARP_AT_TYPE) ? snap_hdr_aarp : snap_hdr_at;
 177
 178                 for (m->m_pkthdr.len = 0, m1 = m; m1; m1 = m1->m_next)
 179                         m->m_pkthdr.len += m1->m_len;
 180                 m->m_pkthdr.rcvif = 0;
 181
 182                 /* *** Note: AT is sending out mbufs of type MSG_DATA,
 183                    not MT_DATA.  *** */
 184 #ifdef APPLETALK_DEBUG
 185                 if (m->m_next &&
 186                     !((m->m_next)->m_flags & M_EXT))
 187                         kprintf("po: mlen= %d, m2len= %d\n", m->m_len,
 188                                 (m->m_next)->m_len);
 189 #endif
 190                 atalk_unlock();
 191                 dlil_output(patp->aa_ifp, PF_APPLETALK, m, NULL, &dst, 0, NULL);
 192                 atalk_lock();
 193
 194                 pktsOut++;
 195         }
 196
 197         return 0;
 198 } /* pat_output */
 199
 200 static void
 201 at_input_packet(
 202         __unused protocol_family_t      protocol,
 203         mbuf_t                                          m)
 204 {
 205         struct mbuf *m1;
 206         struct ifnet *ifp;
 207         llc_header_t *llc_header;
 208         at_ifaddr_t *ifID;
 209         char src[6];
 210         enet_header_t *enet_header;
 211
 212         if (!appletalk_inited) {
 213                 m_freem(m);
 214                 return;
 215         }
 216
 217         if ((m->m_flags & M_PKTHDR) == 0) {
 218 #ifdef APPLETALK_DEBUG
 219                 kprintf("atalkintr: no HDR on packet received");
 220 #endif
 221                 m_freem(m);
 222                 return;
 223         }
 224
 225           /* make sure the interface this packet was received on is configured
 226              for AppleTalk */
 227           ifp = m->m_pkthdr.rcvif;
 228           TAILQ_FOREACH(ifID, &at_ifQueueHd, aa_link) {
 229                 if (ifID->aa_ifp && (ifID->aa_ifp == ifp))
 230                         break;
 231           }
 232           /* if we didn't find a matching interface */
 233           if (!ifID) {
 234                 m_freem(m);
 235                 return; /* was EAFNOSUPPORT */
 236           }
 237
 238           /* make sure the entire packet header is in the current mbuf */
 239           if (m->m_len < ENET_LLC_SIZE &&
 240               (m = m_pullup(m, ENET_LLC_SIZE)) == 0) {
 241 #ifdef APPLETALK_DEBUG
 242                 kprintf("atalkintr: packet too small\n");
 243 #endif
 244                 m_freem(m);
 245                 return;
 246           }
 247           enet_header = mtod(m, enet_header_t *);
 248
 249           /* Ignore multicast packets from local station */
 250           /* *** Note: code for IFTYPE_TOKENTALK may be needed here. *** */
 251           if (ifID->aa_ifp->if_type == IFT_ETHER ||
 252                 ifID->aa_ifp->if_type == IFT_L2VLAN ||
 253                 ifID->aa_ifp->if_type == IFT_IEEE8023ADLAG) {
 254                 bcopy((char *)enet_header->src, src, sizeof(src));
 255
 256 #ifdef COMMENT  /* In order to receive packets from the Blue Box, we cannot
 257                    reject packets whose source address matches our local address.
 258                 */
 259                 if ((enet_header->dst[0] & 1) &&
 260                     (bcmp(src, ifID->xaddr, sizeof(src)) == 0)) {
 261                   /* Packet rejected: think it's a local mcast. */
 262                   m_freem(m);
 263                   return; /* was EAFNOSUPPORT */
 264                 }
 265 #endif /* COMMENT */
 266
 267                 llc_header = (llc_header_t *)(enet_header+1);
 268
 269                 /* advance the mbuf pointers past the ethernet header */
 270                 m->m_data += ENET_LLC_SIZE;
 271                 m->m_len -= ENET_LLC_SIZE;
 272
 273                 pktsIn++;
 274
 275                 if (LLC_PROTO_EQUAL(llc_header->protocol,snap_proto_aarp)) {
 276                         (void)aarp_rcv_pkt(mtod(m, aarp_pkt_t *), ifID);
 277                         m_freem(m);
 278                 }
 279                 else if (LLC_PROTO_EQUAL(llc_header->protocol, snap_proto_ddp)) {
 280                         /* if we're a router take all pkts */
 281                         if (!ROUTING_MODE) {
 282                           if (aarp_chk_addr(mtod(m, at_ddp_t  *), ifID)
 283                               == AARP_ERR_NOT_OURS) {
 284 #ifdef APPLETALK_DEBUG
 285                             kprintf("pat_input: Packet Rejected: not for us? dest=%x.%x.%x.%x.%x.%x LLC_PROTO= %02x%02x\n",
 286                                     enet_header->dst[0], enet_header->dst[1],
 287                                     enet_header->dst[2], enet_header->dst[3],
 288                                     enet_header->dst[4], enet_header->dst[5],
 289                                     llc_header->protocol[3],
 290                                     llc_header->protocol[4]);
 291 #endif
 292                             m_freem(m);
 293                             return; /* was EAFNOSUPPORT */
 294                           }
 295                         }
 296                         MCHTYPE(m, MSG_DATA); /* set the mbuf type */
 297
 298                         ifID->stats.rcv_packets++;
 299                         for (m1 = m; m1; m1 = m1->m_next)
 300                                 ifID->stats.rcv_bytes += m1->m_len;
 301
 302                         if (!MULTIPORT_MODE)
 303                                 ddp_glean(m, ifID, (struct etalk_addr *)src);
 304
 305                         ddp_input(m, ifID);
 306                 } else {
 307 #ifdef APPLETALK_DEBUG
 308                         kprintf("pat_input: Packet Rejected: wrong LLC_PROTO = %02x%02x\n",
 309                                 llc_header->protocol[3],
 310                                 llc_header->protocol[4]);
 311 #endif
 312                         m_freem(m);
 313                 }
 314         }
 315 }