net/ax25/af

/* */
This source file includes following definitions.
ax2asc
ax25cmp
ax25_remove_socket
ax25_kill_by_device
ax25_device_event
ax25_insert_socket
ax25_find_listener
ax25_find_socket
ax25_find_cb
ax25_addr_match
ax25_send_to_raw
ax25_destroy_timer
ax25_destroy_socket
ax25_findbyuid
ax25_uid_ioctl
ax25_create_cb
ax25_fillin_cb
ax25_send_frame
ax25rtr_get_dev
ax25_fcntl
ax25_setsockopt
ax25_getsockopt
ax25_listen
def_callback1
def_callback2
ax25_create
ax25_make_new
ax25_dup
ax25_release
ax25_bind
ax25_connect
ax25_socketpair
ax25_accept
ax25_getname
ax25_rcv
kiss_rcv
bpq_rcv
ax25_sendmsg
ax25_sendto
ax25_send
ax25_write
ax25_recvmsg
ax25_recvfrom
ax25_recv
ax25_read
ax25_shutdown
ax25_select
ax25_ioctl
ax25_get_info
ax25_proto_init
ax25_queue_xmit
ax25_encapsulate
ax25_rebuild_header
   1 /*
   2  *      AX.25 release 030
   3  *
   4  *      This is ALPHA test software. This code may break your machine, randomly fail to work with new 
   5  *      releases, misbehave and/or generally screw up. It might even work. 
   6  *
   7  *      This code REQUIRES 1.2.1 or higher/ NET3.029
   8  *
   9  *      This module:
  10  *              This module is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      History
  16  *      AX.25 006       Alan(GW4PTS)            Nearly died of shock - its working 8-)
  17  *      AX.25 007       Alan(GW4PTS)            Removed the silliest bugs
  18  *      AX.25 008       Alan(GW4PTS)            Cleaned up, fixed a few state machine problems, added callbacks
  19  *      AX.25 009       Alan(GW4PTS)            Emergency patch kit to fix memory corruption
  20  *      AX.25 010       Alan(GW4PTS)            Added RAW sockets/Digipeat.
  21  *      AX.25 011       Alan(GW4PTS)            RAW socket and datagram fixes (thanks) - Raw sendto now gets PID right
  22  *                                              datagram sendto uses correct target address.
  23  *      AX.25 012       Alan(GW4PTS)            Correct incoming connection handling, send DM to failed connects.
  24  *                                              Use skb->data not skb+1. Support sk->priority correctly.
  25  *                                              Correct receive on SOCK_DGRAM.
  26  *      AX.25 013       Alan(GW4PTS)            Send DM to all unknown frames, missing initialiser fixed
  27  *                                              Leave spare SSID bits set (DAMA etc) - thanks for bug report,
  28  *                                              removed device registration (its not used or needed). Clean up for
  29  *                                              gcc 2.5.8. PID to AX25_P_
  30  *      AX.25 014       Alan(GW4PTS)            Cleanup and NET3 merge
  31  *      AX.25 015       Alan(GW4PTS)            Internal test version.
  32  *      AX.25 016       Alan(GW4PTS)            Semi Internal version for PI card
  33  *                                              work.
  34  *      AX.25 017       Alan(GW4PTS)            Fixed some small bugs reported by
  35  *                                              G4KLX
  36  *      AX.25 018       Alan(GW4PTS)            Fixed a small error in SOCK_DGRAM
  37  *      AX.25 019       Alan(GW4PTS)            Clean ups for the non INET kernel and device ioctls in AX.25
  38  *      AX.25 020       Jonathan(G4KLX)         /proc support and other changes.
  39  *      AX.25 021       Alan(GW4PTS)            Added AX25_T1, AX25_N2, AX25_T3 as requested.
  40  *      AX.25 022       Jonathan(G4KLX)         More work on the ax25 auto router and /proc improved (again)!
  41  *                      Alan(GW4PTS)            Added TIOCINQ/OUTQ
  42  *      AX.25 023       Alan(GW4PTS)            Fixed shutdown bug
  43  *      AX.25 023       Alan(GW4PTS)            Linus changed timers
  44  *      AX.25 024       Alan(GW4PTS)            Small bug fixes
  45  *      AX.25 025       Alan(GW4PTS)            More fixes, Linux 1.1.51 compatibility stuff, timers again!
  46  *      AX.25 026       Alan(GW4PTS)            Small state fix.
  47  *      AX.25 027       Alan(GW4PTS)            Socket close crash fixes.
  48  *      AX.25 028       Alan(GW4PTS)            Callsign control including settings per uid.
  49  *                                              Small bug fixes.
  50  *                                              Protocol set by sockets only.
  51  *                                              Small changes to allow for start of NET/ROM layer.
  52  *      AX.25 028a      Jonathan(G4KLX)         Changes to state machine.
  53  *      AX.25 028b      Jonathan(G4KLX)         Extracted ax25 control block
  54  *                                              from sock structure.
  55  *      AX.25 029       Alan(GW4PTS)            Combined 028b and some KA9Q code
  56  *                      Jonathan(G4KLX)         and removed all the old Berkeley, added IP mode registration.
  57  *                      Darryl(G7LED)           stuff. Cross-port digipeating. Minor fixes and enhancements.
  58  *                      Alan(GW4PTS)            Missed suser() on axassociate checks
  59  *      AX.25 030       Alan(GW4PTS)            Added variable length headers.
  60  *                      Jonathan(G4KLX)         Added BPQ Ethernet interface.
  61  *                      Steven(GW7RRM)          Added digi-peating control ioctl.
  62  *                                              Added extended AX.25 support.
  63  *                                              Added AX.25 frame segmentation.
  64  *
  65  *      To do:
  66  *              Restructure the ax25_rcv code to be cleaner/faster and
  67  *              copy only when needed.
  68  *              Consider better arbitary protocol support.
  69  *              Fix non-blocking connect failure.
  70  *              Settable protocol id for SEQPACKET sockets
  71  */
  72  
  73 #include <linux/config.h>
  74 #ifdef CONFIG_AX25
  75 #include <linux/errno.h>
  76 #include <linux/types.h>
  77 #include <linux/socket.h>
  78 #include <linux/in.h>
  79 #include <linux/kernel.h>
  80 #include <linux/sched.h>
  81 #include <linux/timer.h>
  82 #include <linux/string.h>
  83 #include <linux/sockios.h>
  84 #include <linux/net.h>
  85 #include <net/ax25.h>
  86 #include <linux/inet.h>
  87 #include <linux/netdevice.h>
  88 #include <linux/if_arp.h>
  89 #include <linux/skbuff.h>
  90 #include <net/sock.h>
  91 #include <asm/segment.h>
  92 #include <asm/system.h>
  93 #include <linux/fcntl.h>
  94 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  95 #include <linux/mm.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/notifier.h>
  98 #include <linux/proc_fs.h>
  99 #include <linux/stat.h>
 100 
 101 #include <net/ip.h>
 102 #include <net/arp.h>
 103 
 104 static int ax25_digi_on = 1;
 105 
 106 #define CONFIG_AX25_XDIGI       /* Cross port (band) digi stuff */
 107 
 108 /**********************************************************************************************************************\
 109 *                                                                                                                      *
 110 *                                               Handlers for the socket list.                                          *
 111 *                                                                                                                      *
 112 \**********************************************************************************************************************/
 113 
 114 static ax25_cb *volatile ax25_list = NULL;
 115 
 116 /*
 117  *      ax25 -> ascii conversion
 118  */
 119 char *ax2asc(ax25_address *a)
     /*  */
 120 {
 121         static char buf[11];
 122         char c, *s;
 123         int n;
 124 
 125         for (n = 0, s = buf; n < 6; n++)
 126         {
 127                 c = (a->ax25_call[n] >> 1) & 0x7F;
 128 
 129                 if (c != ' ') *s++ = c;
 130         }
 131         
 132         *s++ = '-';
 133 
 134         if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9)
 135         {
 136                 *s++ = '1';
 137                 n -= 10;
 138         }
 139         
 140         *s++ = n + '0';
 141         *s++ = '\0';
 142 
 143         return(buf);
 144 
 145 }
 146 
 147 /*
 148  *      Compare two ax.25 addresses
 149  */
 150 int ax25cmp(ax25_address *a, ax25_address *b)
     /*  */
 151 {
 152         int ct = 0;
 153 
 154         while (ct < 6) {
 155                 if ((a->ax25_call[ct] & 0xFE) != (b->ax25_call[ct] & 0xFE))     /* Clean off repeater bits */
 156                         return 1;
 157                 ct++;
 158         }
 159 
 160         if ((a->ax25_call[ct] & 0x1E) == (b->ax25_call[ct] & 0x1E))     /* SSID without control bit */
 161                 return 0;
 162 
 163         return 2;                       /* Partial match */
 164 }
 165 
 166 /*
 167  *      Socket removal during an interrupt is now safe.
 168  */
 169 static void ax25_remove_socket(ax25_cb *ax25)
     /*  */
 170 {
 171         ax25_cb *s;
 172         unsigned long flags;
 173         
 174         save_flags(flags);
 175         cli();
 176 
 177         if ((s = ax25_list) == ax25) {
 178                 ax25_list = s->next;
 179                 restore_flags(flags);
 180                 return;
 181         }
 182 
 183         while (s != NULL && s->next != NULL) {
 184                 if (s->next == ax25) {
 185                         s->next = ax25->next;
 186                         restore_flags(flags);
 187                         return;
 188                 }
 189 
 190                 s = s->next;
 191         }
 192 
 193         restore_flags(flags);
 194 }
 195 
 196 /*
 197  *      Kill all bound sockets on a dropped device.
 198  */
 199 static void ax25_kill_by_device(struct device *dev)
     /*  */
 200 {
 201         ax25_cb *s;
 202         
 203         for (s = ax25_list; s != NULL; s = s->next) {
 204                 if (s->device == dev) {
 205                         s->state  = AX25_STATE_0;
 206                         s->device = NULL;
 207                         if (s->sk != NULL) {
 208                                 s->sk->state = TCP_CLOSE;
 209                                 s->sk->err   = ENETUNREACH;
 210                                 if (!s->sk->dead)
 211                                         s->sk->state_change(s->sk);
 212                                 s->sk->dead  = 1;
 213                         }
 214                 }
 215         }
 216 }
 217 
 218 /*
 219  *      Handle device status changes.
 220  */
 221 static int ax25_device_event(unsigned long event, void *ptr)
     /*  */
 222 {
 223         struct device *dev = (struct device *)ptr;
 224 
 225         switch (event) {
 226                 case NETDEV_UP:
 227                         ax25_dev_device_up(dev);
 228                         break;
 229                 case NETDEV_DOWN:
 230                         ax25_kill_by_device(dev);
 231                         ax25_rt_device_down(dev);
 232                         ax25_dev_device_down(dev);
 233                         break;
 234                 default:
 235                         break;
 236         }
 237 
 238         return NOTIFY_DONE;
 239 }
 240 
 241 /*
 242  *      Add a socket to the bound sockets list.
 243  */
 244 static void ax25_insert_socket(ax25_cb *ax25)
     /*  */
 245 {
 246         unsigned long flags;
 247 
 248         save_flags(flags);
 249         cli();
 250 
 251         ax25->next = ax25_list;
 252         ax25_list  = ax25;
 253 
 254         restore_flags(flags);
 255 }
 256 
 257 /*
 258  *      Find a socket that wants to accept the SABM we just
 259  *      received.
 260  */
 261 static struct sock *ax25_find_listener(ax25_address *addr, struct device *dev, int type)
     /*  */
 262 {
 263         unsigned long flags;
 264         ax25_cb *s;
 265 
 266         save_flags(flags);
 267         cli();
 268 
 269         for (s = ax25_list; s != NULL; s = s->next) {
 270                 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && s->sk->type == type && s->sk->state == TCP_LISTEN) {
 271                         /* If device is null we match any device */
 272                         if (s->device == NULL || s->device == dev) {
 273                                 restore_flags(flags);
 274                                 return s->sk;
 275                         }
 276                 }
 277         }
 278 
 279         restore_flags(flags);
 280         return NULL;
 281 }
 282 
 283 /*
 284  *      Find an AX.25 socket given both ends.
 285  */
 286 static struct sock *ax25_find_socket(ax25_address *my_addr, ax25_address *dest_addr, int type)
     /*  */
 287 {
 288         ax25_cb *s;
 289         unsigned long flags;
 290 
 291         save_flags(flags);
 292         cli();
 293 
 294         for (s = ax25_list; s != NULL; s = s->next) {
 295                 if (s->sk != NULL && ax25cmp(&s->source_addr, my_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->sk->type == type) {
 296                         restore_flags(flags);
 297                         return s->sk;
 298                 }
 299         }
 300 
 301         restore_flags(flags);
 302 
 303         return NULL;
 304 }
 305 
 306 /*
 307  *      Find an AX.25 control block given both ends. It will only pick up
 308  *      floating AX.25 control blocks or non Raw socket bound control blocks.
 309  */
 310 static ax25_cb *ax25_find_cb(ax25_address *my_addr, ax25_address *dest_addr, struct device *dev)
     /*  */
 311 {
 312         ax25_cb *s;
 313         unsigned long flags;
 314 
 315         save_flags(flags);
 316         cli();
 317 
 318         for (s = ax25_list; s != NULL; s = s->next) {
 319                 if (s->sk != NULL && s->sk->type != SOCK_SEQPACKET)
 320                         continue;
 321                 if (ax25cmp(&s->source_addr, my_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->device == dev) {
 322                         restore_flags(flags);
 323                         return s;
 324                 }
 325         }
 326 
 327         restore_flags(flags);
 328 
 329         return NULL;
 330 }
 331 
 332 /*
 333  *      Look for any matching address - RAW sockets can bind to arbitary names
 334  */
 335 static struct sock *ax25_addr_match(ax25_address *addr)
     /*  */
 336 {
 337         unsigned long flags;
 338         ax25_cb *s;
 339 
 340         save_flags(flags);
 341         cli();
 342 
 343         for (s = ax25_list; s != NULL; s = s->next) {
 344                 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && s->sk->type == SOCK_RAW) {
 345                         restore_flags(flags);
 346                         return s->sk;
 347                 }
 348         }
 349 
 350         restore_flags(flags);
 351 
 352         return NULL;
 353 }
 354 
 355 static void ax25_send_to_raw(struct sock *sk, struct sk_buff *skb, int proto)
     /*  */
 356 {
 357         struct sk_buff *copy;
 358         
 359         while (sk != NULL) {
 360                 if (sk->type == SOCK_RAW && sk->protocol == proto && sk->rmem_alloc <= sk->rcvbuf) {
 361                         if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
 362                                 return;
 363 
 364                         copy->sk = sk;
 365                         sk->rmem_alloc += copy->truesize;
 366                         skb_queue_tail(&sk->receive_queue, copy);
 367                         if (!sk->dead)
 368                                 sk->data_ready(sk, skb->len);
 369                 }
 370 
 371                 sk = sk->next;
 372         }
 373 }       
 374 
 375 /*
 376  *      Deferred destroy.
 377  */
 378 void ax25_destory_socket(ax25_cb *);
 379 
 380 /*
 381  *      Handler for deferred kills.
 382  */
 383 static void ax25_destroy_timer(unsigned long data)
     /*  */
 384 {
 385         ax25_destroy_socket((ax25_cb *)data);
 386 }
 387 
 388 /*
 389  *      This is called from user mode and the timers. Thus it protects itself against
 390  *      interrupt users but doesn't worry about being called during work.
 391  *      Once it is removed from the queue no interrupt or bottom half will
 392  *      touch it and we are (fairly 8-) ) safe.
 393  */
 394 void ax25_destroy_socket(ax25_cb *ax25) /* Not static as its used by the timer */
     /*  */
 395 {
 396         struct sk_buff *skb;
 397         unsigned long flags;
 398         
 399         save_flags(flags);
 400         cli();
 401         
 402         del_timer(&ax25->timer);
 403         
 404         ax25_remove_socket(ax25);
 405         ax25_clear_queues(ax25);        /* Flush the queues */
 406         
 407         if (ax25->sk != NULL) {
 408                 while ((skb = skb_dequeue(&ax25->sk->receive_queue)) != NULL) {
 409                         if (skb->sk != ax25->sk) {                      /* A pending connection */
 410                                 skb->sk->dead = 1;      /* Queue the unaccepted socket for death */
 411                                 ax25_set_timer(skb->sk->ax25);
 412                                 skb->sk->ax25->state = AX25_STATE_0;
 413                         }
 414 
 415                         kfree_skb(skb, FREE_READ);
 416                 }
 417         }
 418         
 419         if (ax25->digipeat != NULL) {
 420                 kfree_s(ax25->digipeat, sizeof(ax25_digi));
 421                 ax25->digipeat = NULL;
 422         }
 423 
 424         if (ax25->sk != NULL) {
 425                 if (ax25->sk->wmem_alloc || ax25->sk->rmem_alloc) { /* Defer: outstanding buffers */
 426                         init_timer(&ax25->timer);
 427                         ax25->timer.expires  = jiffies + 10 * HZ;
 428                         ax25->timer.function = ax25_destroy_timer;
 429                         ax25->timer.data     = (unsigned long)ax25;
 430                         add_timer(&ax25->timer);
 431                 } else {
 432                         kfree_s(ax25->sk, sizeof(*ax25->sk));
 433                         kfree_s(ax25, sizeof(*ax25));
 434                 }
 435         } else {
 436                 kfree_s(ax25, sizeof(*ax25));
 437         }
 438 
 439         restore_flags(flags);
 440 }
 441 
 442 /*
 443  *      Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
 444  */
 445 
 446 ax25_uid_assoc *ax25_uid_list;
 447 
 448 int ax25_uid_policy = 0;
 449 
 450 ax25_address *ax25_findbyuid(uid_t uid)
     /*  */
 451 {
 452         ax25_uid_assoc *a;
 453         
 454         for (a = ax25_uid_list; a != NULL; a = a->next) {
 455                 if (a->uid == uid)
 456                         return &a->call;
 457         }
 458 
 459         return NULL;
 460 }
 461 
 462 static int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
     /*  */
 463 {
 464         ax25_uid_assoc *a;
 465         
 466         switch (cmd) {
 467                 case SIOCAX25GETUID:
 468                         for (a = ax25_uid_list; a != NULL; a = a->next) {
 469                                 if (ax25cmp(&sax->sax25_call, &a->call) == 0)
 470                                         return a->uid;
 471                         }
 472                         return -ENOENT;
 473                 case SIOCAX25ADDUID:
 474                         if(!suser())
 475                                 return -EPERM;
 476                         if (ax25_findbyuid(sax->sax25_uid))
 477                                 return -EEXIST;
 478                         a = (ax25_uid_assoc *)kmalloc(sizeof(*a), GFP_KERNEL);
 479                         if (a == NULL)
 480                                 return -ENOMEM;
 481                         a->uid  = sax->sax25_uid;
 482                         a->call = sax->sax25_call;
 483                         a->next = ax25_uid_list;
 484                         ax25_uid_list = a;
 485                         return 0;
 486                 case SIOCAX25DELUID:
 487                 {
 488                         ax25_uid_assoc **l;
 489                         
 490                         if(!suser())
 491                                 return -EPERM;
 492                         l = &ax25_uid_list;
 493                         while ((*l) != NULL) {
 494                                 if (ax25cmp(&((*l)->call), &(sax->sax25_call)) == 0) {
 495                                         a = *l;
 496                                         *l = (*l)->next;
 497                                         kfree_s(a, sizeof(*a));
 498                                         return 0;
 499                                 }
 500                                 
 501                                 l = &((*l)->next);
 502                         }
 503                         return -ENOENT;
 504                 }
 505         }
 506 
 507         return -EINVAL; /*NOTREACHED */
 508 }       
 509 
 510 /*
 511  * Create an empty AX.25 control block.
 512  */
 513 static ax25_cb *ax25_create_cb(void)
     /*  */
 514 {
 515         ax25_cb *ax25;
 516 
 517         if ((ax25 = (ax25_cb *)kmalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
 518                 return NULL;
 519 
 520         skb_queue_head_init(&ax25->write_queue);
 521         skb_queue_head_init(&ax25->frag_queue);
 522         skb_queue_head_init(&ax25->ack_queue);
 523         skb_queue_head_init(&ax25->reseq_queue);
 524 
 525         init_timer(&ax25->timer);
 526 
 527         ax25->rtt     = (AX25_DEF_T1 * PR_SLOWHZ) / 2;
 528         ax25->t1      = AX25_DEF_T1 * PR_SLOWHZ;
 529         ax25->t2      = AX25_DEF_T2 * PR_SLOWHZ;
 530         ax25->t3      = AX25_DEF_T3 * PR_SLOWHZ;
 531         ax25->n2      = AX25_DEF_N2;
 532 
 533         ax25->modulus   = AX25_DEF_AXDEFMODE;
 534         ax25->fragno    = 0;
 535         ax25->fraglen   = 0;
 536         ax25->hdrincl   = 0;
 537         ax25->backoff   = AX25_DEF_BACKOFF == 'E';
 538         ax25->condition = 0x00;
 539         ax25->t1timer   = 0;
 540         ax25->t2timer   = 0;
 541         ax25->t3timer   = 0;
 542         ax25->n2count   = 0;
 543 
 544         ax25->va      = 0;
 545         ax25->vr      = 0;
 546         ax25->vs      = 0;
 547 
 548         if (AX25_DEF_AXDEFMODE == EMODULUS) {
 549                 ax25->window = AX25_DEF_EWINDOW;
 550         } else {
 551                 ax25->window = AX25_DEF_WINDOW;
 552         }
 553         ax25->device   = NULL;
 554         ax25->digipeat = NULL;
 555         ax25->sk       = NULL;
 556 
 557         ax25->state    = AX25_STATE_0;
 558 
 559         memset(&ax25->dest_addr,   '\0', sizeof(ax25_address));
 560         memset(&ax25->source_addr, '\0', sizeof(ax25_address));
 561 
 562         return ax25;
 563 }
 564 
 565 /*
 566  *      Fill in a created AX.25 created control block with the default
 567  *      values for a particular device.
 568  */
 569 static void ax25_fillin_cb(ax25_cb *ax25, struct device *dev)
     /*  */
 570 {
 571         ax25->device = dev;
 572 
 573         ax25->rtt = ax25_dev_get_value(dev, AX25_VALUES_T1);
 574         ax25->t1  = ax25_dev_get_value(dev, AX25_VALUES_T1);
 575         ax25->t2  = ax25_dev_get_value(dev, AX25_VALUES_T2);
 576         ax25->t3  = ax25_dev_get_value(dev, AX25_VALUES_T3);
 577         ax25->n2  = ax25_dev_get_value(dev, AX25_VALUES_N2);
 578 
 579         ax25->modulus = ax25_dev_get_value(dev, AX25_VALUES_AXDEFMODE);
 580 
 581         if (ax25->modulus == MODULUS) {
 582                 ax25->window = ax25_dev_get_value(dev, AX25_VALUES_WINDOW);
 583         } else {
 584                 ax25->window = ax25_dev_get_value(dev, AX25_VALUES_EWINDOW);
 585         }
 586 
 587         ax25->backoff = ax25_dev_get_value(dev, AX25_VALUES_BACKOFF) == 'E';
 588 }
 589 
 590 int ax25_send_frame(struct sk_buff *skb, ax25_address *src, ax25_address *dest,
     /*  */
 591         ax25_digi *digi, struct device *dev)
 592 {
 593         ax25_cb *ax25;
 594 
 595         if (skb == NULL)
 596                 return 0;
 597 
 598         /*
 599          * Look for an existing connection.
 600          */
 601         for (ax25 = ax25_list; ax25 != NULL; ax25 = ax25->next) {
 602                 if (ax25->sk != NULL && ax25->sk->type != SOCK_SEQPACKET)
 603                         continue;
 604 
 605                 if (ax25cmp(&ax25->source_addr, src) == 0 && ax25cmp(&ax25->dest_addr, dest) == 0 && ax25->device == dev) {
 606                         ax25_output(ax25, skb);
 607                         return 1;               /* It already existed */
 608                 }
 609         }
 610 
 611         if ((ax25 = ax25_create_cb()) == NULL)
 612                 return 0;
 613 
 614         ax25_fillin_cb(ax25, dev);
 615 
 616         memcpy(&ax25->source_addr, src,  sizeof(ax25_address));
 617         memcpy(&ax25->dest_addr,   dest, sizeof(ax25_address));
 618 
 619         if (digi != NULL) {
 620                 if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
 621                         kfree_s(ax25, sizeof(ax25));
 622                         return 0;
 623                 }
 624                 memcpy(ax25->digipeat, digi, sizeof(ax25_digi));
 625         }
 626 
 627         ax25_establish_data_link(ax25);
 628         ax25_insert_socket(ax25);
 629 
 630         ax25->state = AX25_STATE_1;
 631 
 632         ax25_set_timer(ax25);
 633 
 634         ax25_output(ax25, skb);
 635                         
 636         return 1;                       /* We had to create it */       
 637 }
 638 
 639 /*******************************************************************************************************************\
 640 *                                                                                                                   *
 641 *               Routing rules for AX.25: Basically iterate over the active interfaces                               *
 642 *                                                                                                                   *
 643 \*******************************************************************************************************************/
 644 
 645 struct device *ax25rtr_get_dev(ax25_address *addr)
     /*  */
 646 {
 647         struct device *dev;
 648         ax25_address dev_addr;
 649         
 650         for (dev = dev_base; dev != NULL; dev = dev->next) {
 651                 if (dev->flags & IFF_UP) {
 652                         switch (dev->type) {
 653                                 case ARPHRD_AX25: /* Active kiss ax25 mode */ 
 654                                         if (ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0)
 655                                                 return dev;
 656                                         break;
 657                                 case ARPHRD_ETHER:
 658                                         if (arp_query((unsigned char *)&dev_addr, dev->pa_addr, ARPHRD_AX25))
 659                                                 if (ax25cmp(addr, &dev_addr) == 0)
 660                                                         return dev;
 661                                         break;
 662                                 default:
 663                                         break;
 664                         }
 665                 }
 666         }
 667 
 668         return NULL;
 669 }
 670 
 671 /*******************************************************************************************************************\
 672 *                                                                                                                   *
 673 *             Handling for system calls applied via the various interfaces to an AX25 socket object                 *
 674 *                                                                                                                   *
 675 \*******************************************************************************************************************/
 676  
 677 static int ax25_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg)
     /*  */
 678 {
 679         switch(cmd)
 680         {
 681                 default:
 682                         return(-EINVAL);
 683         }
 684 }
 685 
 686 static int ax25_setsockopt(struct socket *sock, int level, int optname,
     /*  */
 687         char *optval, int optlen)
 688 {
 689         struct sock *sk;
 690         int err, opt;
 691 
 692         sk = (struct sock *)sock->data;
 693         
 694         if (level == SOL_SOCKET)
 695                 return sock_setsockopt(sk, level, optname, optval, optlen);
 696 
 697         if (level != SOL_AX25)
 698                 return -EOPNOTSUPP;
 699 
 700         if (optval == NULL)
 701                 return -EINVAL;
 702 
 703         if ((err = verify_area(VERIFY_READ, optval, sizeof(int))) != 0)
 704                 return err;
 705 
 706         opt = get_fs_long((unsigned long *)optval);
 707 
 708         switch (optname) {
 709                 case AX25_WINDOW:
 710                         if (sk->ax25->modulus == MODULUS) {
 711                                 if (opt < 1 || opt > 7)
 712                                         return -EINVAL;
 713                         } else {
 714                                 if (opt < 1 || opt > 63)
 715                                         return -EINVAL;
 716                         }
 717                         sk->ax25->window = opt;
 718                         return 0;
 719 
 720                 case AX25_T1:
 721                         if (opt < 1)
 722                                 return -EINVAL;
 723                         sk->ax25->rtt = (opt * PR_SLOWHZ) / 2;
 724                         return 0;
 725 
 726                 case AX25_T2:
 727                         if (opt < 1)
 728                                 return -EINVAL;
 729                         sk->ax25->t2 = opt * PR_SLOWHZ;
 730                         return 0;
 731 
 732                 case AX25_N2:
 733                         if (opt < 1 || opt > 31)
 734                                 return -EINVAL;
 735                         sk->ax25->n2 = opt;
 736                         return 0;
 737 
 738                 case AX25_T3:
 739                         if (opt < 1)
 740                                 return -EINVAL;
 741                         sk->ax25->t3 = opt * PR_SLOWHZ;
 742                         return 0;
 743 
 744                 case AX25_BACKOFF:
 745                         sk->ax25->backoff = opt ? 1 : 0;
 746                         return 0;
 747 
 748                 case AX25_EXTSEQ:
 749                         sk->ax25->modulus = opt ? EMODULUS : MODULUS;
 750                         return 0;
 751 
 752                 case AX25_HDRINCL:
 753                         sk->ax25->hdrincl = opt ? 1 : 0;
 754                         return 0;
 755 
 756                 default:
 757                         return -ENOPROTOOPT;
 758         }
 759 }
 760 
 761 static int ax25_getsockopt(struct socket *sock, int level, int optname,
     /*  */
 762         char *optval, int *optlen)
 763 {
 764         struct sock *sk;
 765         int val = 0;
 766         int err; 
 767 
 768         sk = (struct sock *)sock->data;
 769         
 770         if (level == SOL_SOCKET)
 771                 return sock_getsockopt(sk, level, optname, optval, optlen);
 772         
 773         if (level != SOL_AX25)
 774                 return -EOPNOTSUPP;
 775 
 776         switch (optname) {
 777                 case AX25_WINDOW:
 778                         val = sk->ax25->window;
 779                         break;
 780 
 781                 case AX25_T1:
 782                         val = (sk->ax25->t1 * 2) / PR_SLOWHZ;
 783                         break;
 784 
 785                 case AX25_T2:
 786                         val = sk->ax25->t2 / PR_SLOWHZ;
 787                         break;
 788 
 789                 case AX25_N2:
 790                         val = sk->ax25->n2;
 791                         break;
 792 
 793                 case AX25_T3:
 794                         val = sk->ax25->t3 / PR_SLOWHZ;
 795                         break;
 796 
 797                 case AX25_BACKOFF:
 798                         val = sk->ax25->backoff;
 799                         break;
 800 
 801                 case AX25_EXTSEQ:
 802                         val = (sk->ax25->modulus == EMODULUS);
 803                         break;
 804 
 805                 case AX25_HDRINCL:
 806                         val = sk->ax25->hdrincl;
 807                         break;
 808 
 809                 default:
 810                         return -ENOPROTOOPT;
 811         }
 812 
 813         if ((err = verify_area(VERIFY_WRITE, optlen, sizeof(int))) != 0)
 814                 return err;
 815 
 816         put_user(sizeof(int), optlen);
 817 
 818         if ((err = verify_area(VERIFY_WRITE, optval, sizeof(int))) != 0)
 819                 return err;
 820 
 821         put_user(val, optval);
 822 
 823         return 0;
 824 }
 825 
 826 static int ax25_listen(struct socket *sock, int backlog)
     /*  */
 827 {
 828         struct sock *sk = (struct sock *)sock->data;
 829 
 830         if (sk->type == SOCK_SEQPACKET && sk->state != TCP_LISTEN) {
 831                 sk->max_ack_backlog = backlog;
 832                 sk->state           = TCP_LISTEN;
 833                 return 0;
 834         }
 835 
 836         return -EOPNOTSUPP;
 837 }
 838 
 839 static void def_callback1(struct sock *sk)
     /*  */
 840 {
 841         if (!sk->dead)
 842                 wake_up_interruptible(sk->sleep);
 843 }
 844 
 845 static void def_callback2(struct sock *sk, int len)
     /*  */
 846 {
 847         if (!sk->dead)
 848                 wake_up_interruptible(sk->sleep);
 849 }
 850 
 851 static int ax25_create(struct socket *sock, int protocol)
     /*  */
 852 {
 853         struct sock *sk;
 854         ax25_cb *ax25;
 855 
 856         if ((sk = (struct sock *)kmalloc(sizeof(*sk), GFP_ATOMIC)) == NULL)
 857                 return -ENOMEM;
 858 
 859         if ((ax25 = ax25_create_cb()) == NULL) {
 860                 kfree_s(sk, sizeof(*sk));
 861                 return -ENOMEM;
 862         }
 863 
 864         sk->type = sock->type;
 865 
 866         switch (sock->type) {
 867                 case SOCK_DGRAM:
 868                 case SOCK_SEQPACKET:
 869                         if (protocol == 0)
 870                                 protocol = AX25_P_TEXT;
 871                         break;
 872                 case SOCK_RAW:
 873                         break;
 874                 default:
 875                         kfree_s((void *)sk, sizeof(*sk));
 876                         kfree_s((void *)ax25, sizeof(*ax25));
 877                         return -ESOCKTNOSUPPORT;
 878         }
 879 
 880         skb_queue_head_init(&sk->receive_queue);
 881         skb_queue_head_init(&sk->write_queue);
 882         skb_queue_head_init(&sk->back_log);
 883 
 884         sk->socket        = sock;
 885         sk->protocol      = protocol;
 886         sk->dead          = 0;
 887         sk->next          = NULL;
 888         sk->broadcast     = 0;
 889         sk->rcvbuf        = SK_RMEM_MAX;
 890         sk->sndbuf        = SK_WMEM_MAX;
 891         sk->wmem_alloc    = 0;
 892         sk->rmem_alloc    = 0;
 893         sk->inuse         = 0;
 894         sk->debug         = 0;
 895         sk->prot          = NULL;       /* So we use default free mechanisms */
 896         sk->err           = 0;
 897         sk->localroute    = 0;
 898         sk->send_head     = NULL;
 899         sk->state         = TCP_CLOSE;
 900         sk->shutdown      = 0;
 901         sk->priority      = SOPRI_NORMAL;
 902         sk->ack_backlog   = 0;
 903         sk->mtu           = AX25_MTU;   /* 256 */
 904         sk->zapped        = 1;
 905 
 906         sk->state_change = def_callback1;
 907         sk->data_ready   = def_callback2;
 908         sk->write_space  = def_callback1;
 909         sk->error_report = def_callback1;
 910 
 911         if (sock != NULL) {
 912                 sock->data = (void *)sk;
 913                 sk->sleep  = sock->wait;
 914         }
 915 
 916         ax25->sk = sk;
 917         sk->ax25 = ax25;
 918         
 919         return 0;
 920 }
 921 
 922 static struct sock *ax25_make_new(struct sock *osk, struct device *dev)
     /*  */
 923 {
 924         struct sock *sk;
 925         ax25_cb *ax25;
 926 
 927         if ((sk = (struct sock *)kmalloc(sizeof(*sk), GFP_ATOMIC)) == NULL)
 928                 return NULL;
 929 
 930         if ((ax25 = ax25_create_cb()) == NULL) {
 931                 kfree_s(sk, sizeof(*sk));
 932                 return NULL;
 933         }
 934 
 935         ax25_fillin_cb(ax25, dev);
 936 
 937         sk->type   = osk->type;
 938         sk->socket = osk->socket;
 939 
 940         switch(osk->type)
 941         {
 942                 case SOCK_DGRAM:
 943                         break;
 944                 case SOCK_SEQPACKET:
 945                         break;
 946                 default:
 947                         kfree_s((void *)sk, sizeof(*sk));
 948                         kfree_s((void *)ax25, sizeof(*ax25));
 949                         return NULL;
 950         }
 951 
 952         skb_queue_head_init(&sk->receive_queue);
 953         skb_queue_head_init(&sk->write_queue);
 954         skb_queue_head_init(&sk->back_log);
 955 
 956         sk->dead        = 0;
 957         sk->next        = NULL;
 958         sk->priority    = osk->priority;
 959         sk->broadcast   = 0;
 960         sk->protocol    = osk->protocol;
 961         sk->rcvbuf      = osk->rcvbuf;
 962         sk->sndbuf      = osk->sndbuf;
 963         sk->wmem_alloc  = 0;
 964         sk->rmem_alloc  = 0;
 965         sk->inuse       = 0;
 966         sk->ack_backlog = 0;
 967         sk->prot        = NULL; /* So we use default free mechanisms */
 968         sk->err         = 0;
 969         sk->localroute  = 0;
 970         sk->send_head   = NULL;
 971         sk->debug       = osk->debug;
 972         sk->state       = TCP_ESTABLISHED;
 973         sk->window      = osk->window;
 974         sk->shutdown    = 0;
 975         sk->mtu         = osk->mtu;
 976         sk->sleep       = osk->sleep;
 977         sk->zapped      = osk->zapped;
 978 
 979         sk->state_change = def_callback1;
 980         sk->data_ready   = def_callback2;
 981         sk->write_space  = def_callback1;
 982         sk->error_report = def_callback1;
 983 
 984         ax25->modulus = osk->ax25->modulus;
 985         ax25->backoff = osk->ax25->backoff;
 986         ax25->hdrincl = osk->ax25->hdrincl;
 987         ax25->rtt     = osk->ax25->rtt;
 988         ax25->t1      = osk->ax25->t1;
 989         ax25->t2      = osk->ax25->t2;
 990         ax25->t3      = osk->ax25->t3;
 991         ax25->n2      = osk->ax25->n2;
 992 
 993         ax25->window  = osk->ax25->window;
 994 
 995         memcpy(&ax25->source_addr, &osk->ax25->source_addr, sizeof(ax25_address));
 996         
 997         if (osk->ax25->digipeat != NULL) {
 998                 if ((ax25->digipeat = (ax25_digi *)kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
 999                         kfree_s(sk, sizeof(*sk));
1000                         kfree_s(ax25, sizeof(*ax25));
1001                         return NULL;
1002                 }
1003         }
1004 
1005         sk->ax25 = ax25;
1006         ax25->sk = sk;
1007 
1008         return sk;
1009 }
1010 
1011 static int ax25_dup(struct socket *newsock, struct socket *oldsock)
     /*  */
1012 {
1013         struct sock *sk = (struct sock *)oldsock->data;
1014 
1015         return ax25_create(newsock, sk->protocol);
1016 }
1017 
1018 static int ax25_release(struct socket *sock, struct socket *peer)
     /*  */
1019 {
1020         struct sock *sk = (struct sock *)sock->data;
1021 
1022         if (sk == NULL) return 0;
1023 
1024         if (sk->type == SOCK_SEQPACKET) {
1025                 switch (sk->ax25->state) {
1026                         case AX25_STATE_0:
1027                                 sk->dead        = 1;
1028                                 sk->state_change(sk);
1029                                 ax25_destroy_socket(sk->ax25);
1030                                 break;
1031 
1032                         case AX25_STATE_1:
1033                                 ax25_send_control(sk->ax25, DISC, POLLON, C_COMMAND);
1034                                 sk->ax25->state = AX25_STATE_0;
1035                                 sk->dead        = 1;
1036                                 sk->state_change(sk);
1037                                 ax25_destroy_socket(sk->ax25);
1038                                 break;
1039 
1040                         case AX25_STATE_2:
1041                                 ax25_send_control(sk->ax25, DM, POLLON, C_RESPONSE);
1042                                 sk->ax25->state = AX25_STATE_0;
1043                                 sk->dead        = 1;
1044                                 sk->state_change(sk);
1045                                 ax25_destroy_socket(sk->ax25);
1046                                 break;                  
1047 
1048                         case AX25_STATE_3:
1049                         case AX25_STATE_4:
1050                                 ax25_clear_queues(sk->ax25);
1051                                 sk->ax25->n2count = 0;
1052                                 ax25_send_control(sk->ax25, DISC, POLLON, C_COMMAND);
1053                                 sk->ax25->t3timer = 0;
1054                                 sk->ax25->t1timer = sk->ax25->t1 = ax25_calculate_t1(sk->ax25);
1055                                 sk->ax25->state   = AX25_STATE_2;
1056                                 sk->state_change(sk);
1057                                 sk->dead         = 1;
1058                                 break;
1059 
1060                         default:
1061                                 break;
1062                 }
1063         } else {
1064                 sk->dead = 1;
1065                 sk->state_change(sk);
1066                 ax25_destroy_socket(sk->ax25);
1067         }
1068 
1069         sock->data = NULL;      
1070 
1071         return 0;
1072 }
1073 
1074 /*
1075  *      We support a funny extension here so you can (as root) give any callsign
1076  *      digipeated via a local address as source. This is a hack until we add
1077  *      BSD 4.4 ADDIFADDR type support. It is however small and trivially backward
1078  *      compatible 8)
1079  */
1080 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr,int addr_len)
     /*  */
1081 {
1082         struct sock *sk;
1083         struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1084         struct device *dev;
1085         ax25_address *call;
1086         
1087         sk = (struct sock *)sock->data;
1088         
1089         if (sk->zapped == 0)
1090                 return -EIO;
1091                 
1092         if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25))
1093                 return -EINVAL;
1094 
1095 #ifdef DONTDO
1096         if (ax25_find_socket(&addr->fsa_ax25.sax25_call, sk->type) != NULL) {
1097                 if (sk->debug)
1098                         printk("AX25: bind failed: in use\n");
1099                 return -EADDRINUSE;
1100         }
1101 #endif
1102 
1103         call = ax25_findbyuid(current->euid);
1104         if (call == NULL && ax25_uid_policy && !suser())
1105                 return -EPERM;
1106                 
1107         if (call == NULL)
1108                 memcpy(&sk->ax25->source_addr, &addr->fsa_ax25.sax25_call, sizeof(ax25_address));
1109         else
1110                 memcpy(&sk->ax25->source_addr, call, sizeof(ax25_address));
1111 
1112         if (addr_len == sizeof(struct full_sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1113                 if (!suser())
1114                         return -EPERM;
1115                 call = &addr->fsa_digipeater[0];
1116         } else {
1117                 call = &addr->fsa_ax25.sax25_call;
1118         }
1119 
1120         if ((dev = ax25rtr_get_dev(call)) == NULL) {
1121                 if (sk->debug)
1122                         printk("AX25 bind failed: no device\n");
1123                 return -EADDRNOTAVAIL;
1124         }
1125 
1126         ax25_fillin_cb(sk->ax25, dev);
1127         ax25_insert_socket(sk->ax25);
1128 
1129         sk->zapped = 0;
1130 
1131         if (sk->debug)
1132                 printk("AX25: socket is bound\n");
1133 
1134         return 0;
1135 }
1136 
1137 static int ax25_connect(struct socket *sock, struct sockaddr *uaddr,
     /*  */
1138         int addr_len, int flags)
1139 {
1140         struct sock *sk = (struct sock *)sock->data;
1141         struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
1142         int err;
1143         
1144         if (sk->state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
1145                 sock->state = SS_CONNECTED;
1146                 return 0;       /* Connect completed during a ERESTARTSYS event */
1147         }
1148         
1149         if (sk->state == TCP_CLOSE && sock->state == SS_CONNECTING) {
1150                 sock->state = SS_UNCONNECTED;
1151                 return -ECONNREFUSED;
1152         }
1153         
1154         if (sk->state == TCP_ESTABLISHED && sk->type == SOCK_SEQPACKET)
1155                 return -EISCONN;        /* No reconnect on a seqpacket socket */
1156                 
1157         sk->state   = TCP_CLOSE;        
1158         sock->state = SS_UNCONNECTED;
1159 
1160         if (addr_len > sizeof(*addr)) {
1161                 int ct           = 0;
1162                 int ndigi        = addr_len - sizeof(*addr);
1163                 ax25_address *ap = (ax25_address *)(((char *)addr) + sizeof(*addr));
1164 
1165                 /* Size is an exact number of digipeaters ? */
1166                 if (ndigi % sizeof(ax25_address))
1167                         return -EINVAL;
1168 
1169                 ndigi /= sizeof(ax25_address);
1170 
1171                 /* Valid number of digipeaters ? */
1172                 if (ndigi < 1 || ndigi > 6)
1173                         return -EINVAL;
1174 
1175                 if (sk->ax25->digipeat == NULL) {
1176                         if ((sk->ax25->digipeat = (ax25_digi *)kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL)
1177                                 return -ENOMEM;
1178                 }
1179 
1180                 sk->ax25->digipeat->ndigi = ndigi;
1181 
1182                 while (ct < ndigi) {
1183                         sk->ax25->digipeat->repeated[ct] = 0;
1184                         memcpy(&sk->ax25->digipeat->calls[ct], &ap[ct], sizeof(ax25_address));
1185                         ct++;
1186                 }
1187 
1188                 sk->ax25->digipeat->lastrepeat = 0;
1189                 addr_len -= ndigi * sizeof(ax25_address);       
1190         }
1191 
1192         if (addr_len != sizeof(struct sockaddr_ax25))
1193                 return -EINVAL;
1194 
1195         if (sk->zapped) {       /* Must bind first - autobinding in this may or may not work */
1196                 if ((err = ax25_rt_autobind(sk->ax25, &addr->sax25_call)) < 0)
1197                         return err;
1198                 ax25_insert_socket(sk->ax25);           /* Finish the bind */
1199         }
1200                 
1201         if (sk->type == SOCK_SEQPACKET && ax25_find_cb(&sk->ax25->source_addr, &addr->sax25_call, sk->ax25->device) != NULL)
1202                 return -EBUSY;                          /* Already such a connection */
1203                 
1204         memcpy(&sk->ax25->dest_addr, &addr->sax25_call, sizeof(ax25_address));
1205         
1206         /* First the easy one */
1207         if (sk->type != SOCK_SEQPACKET) {
1208                 sock->state = SS_CONNECTED;
1209                 sk->state   = TCP_ESTABLISHED;
1210                 return 0;
1211         }
1212         
1213         /* Move to connecting socket, ax.25 lapb WAIT_UA.. */   
1214         sock->state        = SS_CONNECTING;
1215         sk->state          = TCP_SYN_SENT;
1216         ax25_establish_data_link(sk->ax25);
1217         sk->ax25->state     = AX25_STATE_1;
1218         ax25_set_timer(sk->ax25);               /* Start going SABM SABM until a UA or a give up and DM */
1219         
1220         /* Now the loop */
1221         if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
1222                 return -EINPROGRESS;
1223                 
1224         cli();  /* To avoid races on the sleep */
1225 
1226         /* A DM or timeout will go to closed, a UA will go to ABM */
1227         while (sk->state == TCP_SYN_SENT) {
1228                 interruptible_sleep_on(sk->sleep);
1229                 if (current->signal & ~current->blocked) {
1230                         sti();
1231                         return -ERESTARTSYS;
1232                 }
1233         }
1234 
1235         if (sk->state != TCP_ESTABLISHED) {     /* Not in ABM, not in WAIT_UA -> failed */
1236                 sti();
1237                 sock->state = SS_UNCONNECTED;
1238                 return -sk->err;        /* Always set at this point */
1239         }
1240         
1241         sock->state = SS_CONNECTED;
1242 
1243         sti();
1244         
1245         return 0;
1246 }
1247         
1248 static int ax25_socketpair(struct socket *sock1, struct socket *sock2)
     /*  */
1249 {
1250         return -EOPNOTSUPP;
1251 }
1252 
1253 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
     /*  */
1254 {
1255         struct sock *sk;
1256         struct sock *newsk;
1257         struct sk_buff *skb;
1258 
1259         if (newsock->data)
1260                 kfree_s(newsock->data, sizeof(struct sock));
1261 
1262         newsock->data = NULL;
1263         
1264         sk = (struct sock *)sock->data;
1265 
1266         if (sk->type != SOCK_SEQPACKET)
1267                 return -EOPNOTSUPP;
1268         
1269         if (sk->state != TCP_LISTEN)
1270                 return -EINVAL;
1271                 
1272         /* The write queue this time is holding sockets ready to use
1273            hooked into the SABM we saved */
1274         do {
1275                 cli();
1276                 if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
1277                         if (flags & O_NONBLOCK) {
1278                                 sti();
1279                                 return 0;
1280                         }
1281                         interruptible_sleep_on(sk->sleep);
1282                         if (current->signal & ~current->blocked) {
1283                                 sti();
1284                                 return -ERESTARTSYS;
1285                         }
1286                 }
1287         } while (skb == NULL);
1288 
1289         newsk = skb->sk;
1290         newsk->pair = NULL;
1291         sti();
1292 
1293         /* Now attach up the new socket */
1294         skb->sk = NULL;
1295         kfree_skb(skb, FREE_READ);
1296         sk->ack_backlog--;
1297         newsock->data = newsk;
1298 
1299         return 0;
1300 }
1301 
1302 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
     /*  */
1303         int *uaddr_len, int peer)
1304 {
1305         ax25_address *addr;
1306         struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
1307         struct sock *sk;
1308         unsigned char ndigi, i;
1309         
1310         sk = (struct sock *)sock->data;
1311         
1312         if (peer != 0) {
1313                 if (sk->state != TCP_ESTABLISHED)
1314                         return -ENOTCONN;
1315                 addr = &sk->ax25->dest_addr;
1316         } else {
1317                 addr = &sk->ax25->source_addr;
1318         }
1319                 
1320         sax->fsa_ax25.sax25_family = AF_AX25;
1321         memcpy(&sax->fsa_ax25.sax25_call, addr, sizeof(ax25_address));
1322         sax->fsa_ax25.sax25_ndigis = 0;
1323         *uaddr_len = sizeof(struct sockaddr_ax25);
1324 
1325         /* This will supply digipeat path on both getpeername() and getsockname() */
1326         if (sk->ax25->digipeat != NULL) {
1327                 ndigi = sk->ax25->digipeat->ndigi;
1328                 sax->fsa_ax25.sax25_ndigis = ndigi;
1329                 *uaddr_len += sizeof(ax25_address) * ndigi;
1330                 for (i = 0; i < ndigi; i++)
1331                         memcpy(&sax->fsa_digipeater[i], &sk->ax25->digipeat->calls[i], sizeof(ax25_address));
1332         }
1333 
1334         return 0;
1335 }
1336  
1337 static int ax25_rcv(struct sk_buff *skb, struct device *dev, ax25_address *dev_addr, struct packet_type *ptype)
     /*  */
1338 {
1339         struct sock *make;
1340         struct sock *sk;
1341         int type = 0;
1342         ax25_digi dp;
1343         ax25_cb *ax25;
1344         ax25_address src, dest;
1345         struct sock *raw;
1346         int mine = 0;
1347 
1348         /*
1349          *      Process the AX.25/LAPB frame.
1350          */
1351         skb->h.raw = skb->data;
1352 
1353         /*
1354          *      Parse the address header.
1355          */
1356         if (ax25_parse_addr(skb->data, skb->len, &src, &dest, &dp, &type) == NULL) {
1357                 kfree_skb(skb, FREE_READ);
1358                 return 0;
1359         }
1360 
1361         /*
1362          *      Send the frame to the AX.25 auto-router
1363          */
1364         ax25_rt_rx_frame(&src, dev, &dp);
1365         
1366         /*
1367          *      Ours perhaps ?
1368          */
1369         if (dp.lastrepeat + 1 < dp.ndigi) {             /* Not yet digipeated completely */
1370                 if (ax25cmp(&dp.calls[dp.lastrepeat + 1], dev_addr) == 0) {
1371                         /* We are the digipeater. Mark ourselves as repeated
1372                            and throw the packet back out of the same device */
1373                         dp.lastrepeat++;
1374                         dp.repeated[(int)dp.lastrepeat] = 1;
1375 #ifdef CONFIG_AX25_XDIGI
1376                         while (dp.lastrepeat + 1 < dp.ndigi) {
1377                                 struct device *dev_scan;
1378                                 if ((dev_scan = ax25rtr_get_dev(&dp.calls[dp.lastrepeat + 1])) == NULL)
1379                                         break;
1380                                 dp.lastrepeat++;
1381                                 dp.repeated[(int)dp.lastrepeat] = 1;
1382                                 dev = dev_scan;
1383                         }
1384 #endif
1385                         build_ax25_addr(skb->data, &src, &dest, &dp, type, MODULUS);
1386                         skb->arp = 1;
1387                         if (ax25_digi_on) {
1388                                 ax25_queue_xmit(skb, dev, SOPRI_NORMAL);
1389                         } else {
1390                                 kfree_skb(skb, FREE_READ);
1391                         }
1392                 } else {
1393                         kfree_skb(skb, FREE_READ);
1394                 }
1395 
1396                 return 0;
1397         }
1398 
1399         /*
1400          *      Pull of the AX.25 headers leaving the CTRL/PID bytes
1401          */
1402         skb_pull(skb, size_ax25_addr(&dp));
1403 
1404         /* For our port addreses ? */
1405         if (ax25cmp(&dest, dev_addr) == 0)
1406                 mine = 1;
1407 
1408 #ifdef CONFIG_NETROM
1409         /* Also match on any NET/ROM callsign */
1410         if (!mine && nr_dev_get(&dest) != NULL)
1411                 mine = 1;
1412 #endif  
1413         
1414         if ((*skb->data & ~0x10) == LAPB_UI) {  /* UI frame - bypass LAPB processing */
1415                 skb->h.raw = skb->data + 2;             /* skip control and pid */
1416 
1417                 if ((raw = ax25_addr_match(&dest)) != NULL)
1418                         ax25_send_to_raw(raw, skb, skb->data[1]);
1419 
1420                 if (!mine && ax25cmp(&dest, (ax25_address *)dev->broadcast) != 0) {
1421                         kfree_skb(skb, FREE_READ);
1422                         return 0;
1423                 }
1424 
1425                 /* Now we are pointing at the pid byte */
1426                 switch (skb->data[1]) {
1427 #ifdef CONFIG_INET              
1428                         case AX25_P_IP:
1429                                 skb_pull(skb,2);                /* drop PID/CTRL */
1430                                 ax25_ip_mode_set(&src, dev, 'D');
1431                                 ip_rcv(skb, dev, ptype);        /* Note ptype here is the wrong one, fix me later */
1432                                 break;
1433 
1434                         case AX25_P_ARP:
1435                                 skb_pull(skb,2);
1436                                 arp_rcv(skb, dev, ptype);       /* Note ptype here is wrong... */
1437                                 break;
1438 #endif                          
1439                         case AX25_P_TEXT:
1440                                 /* Now find a suitable dgram socket */
1441                                 if ((sk = ax25_find_socket(&dest, &src, SOCK_DGRAM)) != NULL) {
1442                                         if (sk->rmem_alloc >= sk->rcvbuf) {
1443                                                 kfree_skb(skb, FREE_READ);
1444                                         } else {
1445                                                 /*
1446                                                  *      Remove the control and PID.
1447                                                  */
1448                                                 skb_pull(skb, 2);
1449                                                 skb_queue_tail(&sk->receive_queue, skb);
1450                                                 skb->sk = sk;
1451                                                 sk->rmem_alloc += skb->truesize;
1452                                                 if (!sk->dead)
1453                                                         sk->data_ready(sk, skb->len);
1454                                         }
1455                                 } else {
1456                                         kfree_skb(skb, FREE_READ);
1457                                 }
1458                                 break;  
1459 
1460                         default:
1461                                 kfree_skb(skb, FREE_READ);      /* Will scan SOCK_AX25 RAW sockets */
1462                                 break;
1463                 }
1464 
1465                 return 0;
1466         }
1467 
1468         /*
1469          *      Is connected mode supported on this device ?
1470          *      If not, should we DM the incoming frame (except DMs) or
1471          *      silently ignore them. For now we stay quiet.
1472          */
1473         if (!ax25_dev_get_value(dev, AX25_VALUES_CONMODE)) {
1474                 kfree_skb(skb, FREE_READ);
1475                 return 0;
1476         }
1477         
1478         /* LAPB */
1479         if ((ax25 = ax25_find_cb(&dest, &src, dev)) != NULL) {
1480                 /*
1481                  *      Process the frame. If it is queued up internally it returns one otherwise we 
1482                  *      free it immediately. This routine itself wakes the user context layers so we
1483                  *      do no further work
1484                  */
1485                 if (ax25_process_rx_frame(ax25, skb, type) == 0)
1486                         kfree_skb(skb, FREE_READ);
1487 
1488                 return 0;
1489         }
1490 
1491         if ((*skb->data & ~PF) != SABM && (*skb->data & ~PF) != SABME) {
1492                 /*
1493                  *      Never reply to a DM. Also ignore any connects for
1494                  *      addresses that are not our interfaces and not a socket.
1495                  */
1496                 if ((*skb->data & ~PF) != DM && mine)
1497                         ax25_return_dm(dev, &src, &dest, &dp);
1498 
1499                 kfree_skb(skb, FREE_READ);
1500                 return 0;
1501         }
1502 
1503         if ((sk = ax25_find_listener(&dest, dev, SOCK_SEQPACKET)) != NULL) {
1504                 if (sk->ack_backlog == sk->max_ack_backlog || (make = ax25_make_new(sk, dev)) == NULL) {
1505                         if (mine)
1506                                 ax25_return_dm(dev, &src, &dest, &dp);
1507 
1508                         kfree_skb(skb, FREE_READ);
1509                         return 0;
1510                 }
1511                 
1512                 ax25 = make->ax25;
1513 
1514                 skb_queue_head(&sk->receive_queue, skb);
1515 
1516                 skb->sk     = make;
1517                 make->state = TCP_ESTABLISHED;
1518                 make->pair  = sk;
1519 
1520                 sk->ack_backlog++;
1521         } else {
1522 #ifdef CONFIG_NETROM
1523                 if (!mine) {
1524                         kfree_skb(skb, FREE_READ);
1525                         return 0;
1526                 }
1527 
1528                 if ((ax25 = ax25_create_cb()) == NULL) {
1529                         ax25_return_dm(dev, &src, &dest, &dp);
1530                         kfree_skb(skb, FREE_READ);
1531                         return 0;
1532                 }
1533 
1534                 ax25_fillin_cb(ax25, dev);
1535 #else
1536                 if (mine)
1537                         ax25_return_dm(dev, &src, &dest, &dp);
1538 
1539                 kfree_skb(skb, FREE_READ);
1540                 return 0;
1541 #endif
1542         }
1543 
1544         memcpy(&ax25->source_addr, &dest, sizeof(ax25_address));
1545         memcpy(&ax25->dest_addr,   &src,  sizeof(ax25_address));
1546 
1547         /*
1548          *      Sort out any digipeated paths.
1549          */
1550         if (dp.ndigi != 0 && ax25->digipeat == NULL && (ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
1551                 kfree_skb(skb, FREE_READ);
1552                 ax25_destroy_socket(ax25);
1553                 return 0;
1554         }
1555 
1556         if (dp.ndigi == 0) {
1557                 if (ax25->digipeat != NULL) {
1558                         kfree_s(ax25->digipeat, sizeof(ax25_digi));
1559                         ax25->digipeat = NULL;
1560                 }
1561         } else {
1562                 /* Reverse the source SABM's path */
1563                 ax25_digi_invert(&dp, ax25->digipeat);
1564         }
1565 
1566         if ((*skb->data & ~PF) == SABME) {
1567                 ax25->modulus = EMODULUS;
1568                 ax25->window  = ax25_dev_get_value(dev, AX25_VALUES_EWINDOW);
1569         } else {
1570                 ax25->modulus = MODULUS;
1571                 ax25->window  = ax25_dev_get_value(dev, AX25_VALUES_WINDOW);
1572         }
1573 
1574         ax25->device = dev;
1575         
1576         ax25_send_control(ax25, UA, POLLON, C_RESPONSE);
1577 
1578         ax25->t3timer = ax25->t3;
1579         ax25->state   = AX25_STATE_3;
1580 
1581         ax25_insert_socket(ax25);
1582 
1583         ax25_set_timer(ax25);
1584 
1585         if (sk != NULL) {
1586                 if (!sk->dead)
1587                         sk->data_ready(sk, skb->len );
1588         } else {
1589                 kfree_skb(skb, FREE_READ);
1590         }
1591 
1592         return 0;
1593 }
1594 
1595 /*
1596  *      Receive an AX.25 frame via a SLIP interface.
1597  */
1598 static int kiss_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *ptype)
     /*  */
1599 {
1600         skb->sk = NULL;         /* Initially we don't know who its for */
1601 
1602         if ((*skb->data & 0x0F) != 0) {
1603                 kfree_skb(skb, FREE_READ);      /* Not a KISS data frame */
1604                 return 0;
1605         }
1606 
1607         skb_pull(skb, AX25_KISS_HEADER_LEN);    /* Remove the KISS byte */
1608 
1609         return ax25_rcv(skb, dev, (ax25_address *)dev->dev_addr, ptype);
1610 }
1611 
1612 /*
1613  *      Receive an AX.25 frame via an Ethernet interface.
1614  */
1615 static int bpq_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *ptype)
     /*  */
1616 {
1617         ax25_address port_call;
1618         int len;
1619 
1620         skb->sk = NULL;         /* Initially we don't know who its for */
1621 
1622         if (!arp_query((unsigned char *)&port_call, dev->pa_addr, ARPHRD_AX25)) {
1623                 kfree_skb(skb, FREE_READ);      /* We have no port callsign */
1624                 return 0;
1625         }
1626 
1627         len = skb->data[0] + skb->data[1] * 256 - 5;
1628 
1629         skb_pull(skb, 2);       /* Remove the length bytes */
1630         skb_trim(skb, len);     /* Set the length of the data */
1631 
1632         return ax25_rcv(skb, dev, &port_call, ptype);
1633 }
1634 
1635 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, int len, int noblock, int flags)
     /*  */
1636 {
1637         struct sock *sk = (struct sock *)sock->data;
1638         struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1639         unsigned char *uaddr = (unsigned char *)msg->msg_name;
1640         int err;
1641         struct sockaddr_ax25 sax;
1642         struct sk_buff *skb;
1643         unsigned char *asmptr;
1644         int size;
1645         ax25_digi *dp;
1646         ax25_digi dtmp;
1647         int lv;
1648         int addr_len=msg->msg_namelen;
1649         
1650         if (sk->err) {
1651                 cli();
1652                 err     = sk->err;
1653                 sk->err = 0;
1654                 sti();
1655                 return -err;
1656         }
1657 
1658         if (flags|| msg->msg_accrights)
1659                 return -EINVAL;
1660 
1661         if (sk->zapped)
1662                 return -EADDRNOTAVAIL;
1663                 
1664         if (sk->ax25->device == NULL)
1665                 return -ENETUNREACH;
1666                 
1667         if (usax) {
1668                 int ndigi = addr_len - sizeof(sax);
1669                 if (addr_len < sizeof(sax))
1670                         return -EINVAL;
1671 
1672                 /* Trailing digipeaters on address ?? */
1673                 if (addr_len > sizeof(sax)) {
1674                         int ct = 0;
1675 
1676                         ax25_address *ap = (ax25_address *)(((char *)uaddr) + sizeof(sax));
1677                         /* Size is an exact number of digipeaters ? */
1678                         if (ndigi % sizeof(ax25_address))
1679                                 return -EINVAL;
1680                         ndigi /= sizeof(ax25_address);
1681 
1682                         /* Valid number of digipeaters ? */
1683                         if (ndigi < 1 || ndigi > 6)
1684                                 return -EINVAL;
1685 
1686                         /* Copy data into digipeat structure */
1687                         while (ct < ndigi) {
1688                                 dtmp.repeated[ct] = 0;
1689                                 memcpy(&dtmp.calls[ct], &ap[ct], sizeof(ax25_address));
1690                                 ct++;
1691                         }
1692 
1693                         dtmp.lastrepeat = 0;
1694                         dtmp.ndigi      = ndigi;
1695                         addr_len -= ndigi * sizeof(ax25_address);       
1696                 }
1697 
1698                 memcpy(&sax, usax, sizeof(sax));
1699                 if (sk->type == SOCK_SEQPACKET && memcmp(&sk->ax25->dest_addr, &sax.sax25_call, sizeof(ax25_address)) != 0)
1700                         return -EISCONN;
1701                 if (sax.sax25_family != AF_AX25)
1702                         return -EINVAL;
1703                 if (ndigi != 0)
1704                         dp = &dtmp;
1705                 else
1706                         dp = NULL;
1707         } else {
1708                 if (sk->state != TCP_ESTABLISHED)
1709                         return -ENOTCONN;
1710                 sax.sax25_family = AF_AX25;
1711                 memcpy(&sax.sax25_call, &sk->ax25->dest_addr, sizeof(ax25_address));
1712                 dp = sk->ax25->digipeat;
1713         }
1714         
1715         if (sk->debug)
1716                 printk("AX.25: sendto: Addresses built.\n");
1717 
1718         /* Build a packet */
1719         if (sk->debug)
1720                 printk("AX.25: sendto: building packet.\n");
1721 
1722         /* Assume the worst case */
1723         size = len + 3 + size_ax25_addr(dp) + AX25_BPQ_HEADER_LEN;
1724 
1725         if ((skb = sock_alloc_send_skb(sk, size, 0, 0, &err)) == NULL)
1726                 return err;
1727 
1728         skb->sk   = sk;
1729         skb->free = 1;
1730         skb->arp  = 1;
1731 
1732         skb_reserve(skb, size - len);
1733 
1734         if (sk->debug)
1735                 printk("AX.25: Appending user data\n");
1736 
1737         /* User data follows immediately after the AX.25 data */
1738         memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1739 
1740         /* Add the PID, usually AX25_TEXT */
1741         asmptr  = skb_push(skb, 1);
1742         *asmptr = sk->protocol;
1743 
1744         if (sk->debug)
1745                 printk("AX.25: Transmitting buffer\n");
1746 
1747         if (sk->type == SOCK_SEQPACKET) {
1748                 /* Connected mode sockets go via the LAPB machine */
1749                 if (sk->state != TCP_ESTABLISHED) {
1750                         kfree_skb(skb, FREE_WRITE);
1751                         return -ENOTCONN;
1752                 }
1753 
1754                 ax25_output(sk->ax25, skb);     /* Shove it onto the queue and kick */
1755 
1756                 return len;
1757         } else {
1758                 asmptr = skb_push(skb, 1 + size_ax25_addr(dp));
1759 
1760                 if (sk->debug) {
1761                         printk("Building AX.25 Header (dp=%p).\n", dp);
1762                         if (dp != 0)
1763                                 printk("Num digipeaters=%d\n", dp->ndigi);
1764                 }
1765 
1766                 /* Build an AX.25 header */
1767                 asmptr += (lv = build_ax25_addr(asmptr, &sk->ax25->source_addr, &sax.sax25_call, dp, C_COMMAND, MODULUS));
1768 
1769                 if (sk->debug)
1770                         printk("Built header (%d bytes)\n",lv);
1771 
1772                 skb->h.raw = asmptr;
1773         
1774                 if (sk->debug)
1775                         printk("base=%p pos=%p\n", skb->data, asmptr);
1776 
1777                 *asmptr = LAPB_UI;
1778 
1779                 /* Datagram frames go straight out of the door as UI */
1780                 ax25_queue_xmit(skb, sk->ax25->device, SOPRI_NORMAL);
1781 
1782                 return len;
1783         }
1784                 
1785 }
1786 
1787 static int ax25_sendto(struct socket *sock, const void *ubuf, int size, int noblock, unsigned flags,
     /*  */
1788                 struct sockaddr *sa, int addr_len)
1789 {
1790         struct iovec iov;
1791         struct msghdr msg;
1792         iov.iov_base=(void *)ubuf;
1793         iov.iov_len=size;
1794         msg.msg_name=(void *)sa;
1795         msg.msg_namelen=addr_len;
1796         msg.msg_accrights=NULL;
1797         msg.msg_iov=&iov;
1798         msg.msg_iovlen=1;
1799         return ax25_sendmsg(sock,&msg,size,noblock,flags);      
1800 }
1801 
1802 
1803 static int ax25_send(struct socket *sock, const void *ubuf, int size, int noblock, unsigned flags)
     /*  */
1804 {
1805         return ax25_sendto(sock, ubuf, size, noblock, flags, NULL, 0);
1806 }
1807 
1808 static int ax25_write(struct socket *sock, const char *ubuf, int size, int noblock)
     /*  */
1809 {
1810         return ax25_sendto(sock, ubuf, size, noblock, 0, NULL, 0);
1811 }
1812 
1813 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, int size, int noblock, int flags, int *addr_len)
     /*  */
1814 {
1815         struct sock *sk = (struct sock *)sock->data;
1816         struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1817         char *addrptr = (char *)msg->msg_name;
1818         int copied, length;
1819         struct sk_buff *skb;
1820         int er;
1821 
1822         if (sk->err) {
1823                 cli();
1824                 er      = -sk->err;
1825                 sk->err = 0;
1826                 sti();
1827                 return er;
1828         }
1829         
1830         if (addr_len != NULL)
1831                 *addr_len = sizeof(*sax);
1832 
1833         /*
1834          *      This works for seqpacket too. The receiver has ordered the
1835          *      queue for us! We do one quick check first though
1836          */
1837         if (sk->type == SOCK_SEQPACKET && sk->state != TCP_ESTABLISHED)
1838                 return -ENOTCONN;
1839 
1840         /* Now we can treat all alike */
1841         if ((skb = skb_recv_datagram(sk, flags, noblock, &er)) == NULL)
1842                 return er;
1843 
1844         if (sk->ax25->hdrincl) {
1845                 length = skb->len + (skb->data - skb->h.raw);
1846         } else {
1847                 if (sk->type == SOCK_SEQPACKET)
1848                         skb_pull(skb, 1);               /* Remove PID */
1849                 length     = skb->len;
1850                 skb->h.raw = skb->data;
1851         }
1852 
1853         copied = (size < length) ? size : length;
1854         skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1855         
1856         if (sax) {
1857                 struct sockaddr_ax25 addr;
1858                 ax25_digi digi;
1859                 ax25_address dest;
1860                 unsigned char *dp = skb->data;
1861                 int ct = 0;
1862                 
1863                 ax25_parse_addr(dp, skb->len, NULL, &dest, &digi, NULL);
1864                 addr.sax25_family = AF_AX25;
1865                 memcpy(&addr.sax25_call, &dest, sizeof(ax25_address));
1866                 memcpy(sax,&addr, sizeof(*sax));
1867                 addrptr += sizeof(*sax);
1868 
1869                 while (ct < digi.ndigi) {
1870                         memcpy(addrptr, &digi. calls[ct], AX25_ADDR_LEN);
1871                         addrptr += AX25_ADDR_LEN;
1872                         ct++;
1873                 }
1874                 if (addr_len)
1875                         *addr_len = sizeof(*sax) + AX25_ADDR_LEN * digi.ndigi;
1876         }
1877 
1878         skb_free_datagram(skb);
1879 
1880         return copied;
1881 }               
1882 
1883 static int ax25_recvfrom(struct socket *sock, void *ubuf, int size, int noblock, unsigned flags,
     /*  */
1884                 struct sockaddr *sa, int *addr_len)
1885 {
1886         struct iovec iov;
1887         struct msghdr msg;
1888         iov.iov_base=ubuf;
1889         iov.iov_len=size;
1890         msg.msg_name=(void *)sa;
1891         msg.msg_namelen=0;
1892         if (addr_len)
1893                 msg.msg_namelen = *addr_len;
1894         msg.msg_accrights=NULL;
1895         msg.msg_iov=&iov;
1896         msg.msg_iovlen=1;
1897         return ax25_recvmsg(sock,&msg,size,noblock,flags,addr_len);     
1898 }
1899 
1900 static int ax25_recv(struct socket *sock, void *ubuf, int size , int noblock,
     /*  */
1901         unsigned flags)
1902 {
1903         struct sock *sk = (struct sock *)sock->data;
1904 
1905         if (sk->zapped)
1906                 return -ENOTCONN;
1907 
1908         return ax25_recvfrom(sock, ubuf, size, noblock, flags, NULL, NULL);
1909 }
1910 
1911 static int ax25_read(struct socket *sock, char *ubuf, int size, int noblock)
     /*  */
1912 {
1913         return ax25_recv(sock, ubuf, size, noblock, 0);
1914 }
1915 
1916 static int ax25_shutdown(struct socket *sk, int how)
     /*  */
1917 {
1918         /* FIXME - generate DM and RNR states */
1919         return -EOPNOTSUPP;
1920 }
1921 
1922 static int ax25_select(struct socket *sock , int sel_type, select_table *wait)
     /*  */
1923 {
1924         struct sock *sk = (struct sock *)sock->data;
1925 
1926         return datagram_select(sk, sel_type, wait);
1927 }
1928 
1929 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
     /*  */
1930 {
1931         struct sock *sk = (struct sock *)sock->data;
1932         int err;
1933         long amount = 0;
1934 
1935         switch (cmd) {
1936                 case TIOCOUTQ:
1937                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(unsigned long))) != 0)
1938                                 return err;
1939                         amount = sk->sndbuf - sk->wmem_alloc;
1940                         if (amount < 0)
1941                                 amount = 0;
1942                         put_fs_long(amount, (unsigned long *)arg);
1943                         return 0;
1944 
1945                 case TIOCINQ:
1946                 {
1947                         struct sk_buff *skb;
1948                         /* These two are safe on a single CPU system as only user tasks fiddle here */
1949                         if ((skb = skb_peek(&sk->receive_queue)) != NULL)
1950                                 amount = skb->len;
1951                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(unsigned long))) != 0)
1952                                 return err;
1953                         put_fs_long(amount, (unsigned long *)arg);
1954                         return 0;
1955                 }
1956 
1957                 case SIOCGSTAMP:
1958                         if (sk != NULL) {
1959                                 if (sk->stamp.tv_sec==0)
1960                                         return -ENOENT;
1961                                 if ((err = verify_area(VERIFY_WRITE,(void *)arg,sizeof(struct timeval))) != 0)
1962                                         return err;
1963                                 memcpy_tofs((void *)arg, &sk->stamp, sizeof(struct timeval));
1964                                 return 0;
1965                         }
1966                         return -EINVAL;
1967 
1968                 case SIOCAX25ADDUID:    /* Add a uid to the uid/call map table */
1969                 case SIOCAX25DELUID:    /* Delete a uid from the uid/call map table */
1970                 case SIOCAX25GETUID:
1971                 {
1972                         struct sockaddr_ax25 sax25;
1973                         if ((err = verify_area(VERIFY_READ, (void *)arg, sizeof(struct sockaddr_ax25))) != 0)
1974                                 return err;
1975                         memcpy_fromfs(&sax25, (void *)arg, sizeof(sax25));
1976                         return ax25_uid_ioctl(cmd, &sax25);
1977                 }
1978 
1979                 case SIOCAX25NOUID:     /* Set the default policy (default/bar) */
1980                         if ((err = verify_area(VERIFY_READ, (void *)arg, sizeof(unsigned long))) != 0)
1981                                 return err;
1982                         if(!suser())
1983                                 return -EPERM;
1984                         amount = get_fs_long((void *)arg);
1985                         if (amount > AX25_NOUID_BLOCK)
1986                                 return -EINVAL;
1987                         ax25_uid_policy = amount;
1988                         return 0;
1989 
1990                 case SIOCAX25DIGCTL:
1991                         if ((err = verify_area(VERIFY_READ, (void *)arg, sizeof(int))) != 0)
1992                                 return err;
1993                         if (!suser())
1994                                 return -EPERM;
1995                         amount = get_fs_long((void *)arg);
1996                         ax25_digi_on = amount ? 1 : 0;
1997                         return 0;
1998 
1999                 case SIOCAX25GETPARMS:
2000                 case SIOCAX25SETPARMS:
2001                         return ax25_dev_ioctl(cmd, (void *)arg);
2002 
2003                 case SIOCADDRT:
2004                 case SIOCDELRT:
2005                         if (!suser())
2006                                 return -EPERM;
2007                         return ax25_rt_ioctl(cmd, (void *)arg);
2008 
2009                 case SIOCGIFADDR:
2010                 case SIOCSIFADDR:
2011                 case SIOCGIFDSTADDR:
2012                 case SIOCSIFDSTADDR:
2013                 case SIOCGIFBRDADDR:
2014                 case SIOCSIFBRDADDR:
2015                 case SIOCGIFNETMASK:
2016                 case SIOCSIFNETMASK:
2017                 case SIOCGIFMETRIC:
2018                 case SIOCSIFMETRIC:
2019                         return -EINVAL;
2020 
2021                 default:
2022                         return(dev_ioctl(cmd, (void *)arg));
2023         }
2024 
2025         /*NOTREACHED*/
2026         return(0);
2027 }
2028 
2029 static int ax25_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
     /*  */
2030 {
2031         ax25_cb *ax25;
2032         struct device *dev;
2033         const char *devname;
2034         int len = 0;
2035         off_t pos = 0;
2036         off_t begin = 0;
2037   
2038         cli();
2039 
2040         len += sprintf(buffer, "dest_addr src_addr  dev  st  vs  vr  va    t1     t2     t3     n2  rtt wnd Snd-Q Rcv-Q\n");
2041 
2042         for (ax25 = ax25_list; ax25 != NULL; ax25 = ax25->next) {
2043                 if ((dev = ax25->device) == NULL)
2044                         devname = "???";
2045                 else
2046                         devname = dev->name;
2047 
2048                 len += sprintf(buffer + len, "%-9s ",
2049                         ax2asc(&ax25->dest_addr));
2050                 len += sprintf(buffer + len, "%-9s %-4s %2d %3d %3d %3d %3d/%03d %2d/%02d %3d/%03d %2d/%02d %3d %3d",
2051                         ax2asc(&ax25->source_addr), devname,
2052                         ax25->state,
2053                         ax25->vs, ax25->vr, ax25->va,
2054                         ax25->t1timer / PR_SLOWHZ,
2055                         ax25->t1      / PR_SLOWHZ,
2056                         ax25->t2timer / PR_SLOWHZ,
2057                         ax25->t2      / PR_SLOWHZ,
2058                         ax25->t3timer / PR_SLOWHZ,
2059                         ax25->t3      / PR_SLOWHZ,
2060                         ax25->n2count, ax25->n2,
2061                         ax25->rtt     / PR_SLOWHZ,
2062                         ax25->window);
2063 
2064                 if (ax25->sk != NULL) {
2065                         len += sprintf(buffer + len, " %5ld %5ld\n",
2066                                 ax25->sk->wmem_alloc,
2067                                 ax25->sk->rmem_alloc);
2068                 } else {
2069                         len += sprintf(buffer + len, "\n");
2070                 }
2071                 
2072                 pos = begin + len;
2073 
2074                 if (pos < offset) {
2075                         len   = 0;
2076                         begin = pos;
2077                 }
2078                 
2079                 if (pos > offset + length)
2080                         break;
2081         }
2082 
2083         sti();
2084 
2085         *start = buffer + (offset - begin);
2086         len   -= (offset - begin);
2087 
2088         if (len > length) len = length;
2089 
2090         return(len);
2091 } 
2092 
2093 static struct proto_ops ax25_proto_ops = {
2094         AF_AX25,
2095         
2096         ax25_create,
2097         ax25_dup,
2098         ax25_release,
2099         ax25_bind,
2100         ax25_connect,
2101         ax25_socketpair,
2102         ax25_accept,
2103         ax25_getname,
2104         ax25_read,
2105         ax25_write,
2106         ax25_select,
2107         ax25_ioctl,
2108         ax25_listen,
2109         ax25_send,
2110         ax25_recv,
2111         ax25_sendto,
2112         ax25_recvfrom,
2113         ax25_shutdown,
2114         ax25_setsockopt,
2115         ax25_getsockopt,
2116         ax25_fcntl,
2117         ax25_sendmsg,
2118         ax25_recvmsg
2119 };
2120 
2121 /* Called by socket.c on kernel start up */
2122 
2123 static struct packet_type ax25_packet_type = 
2124 {
2125         0,      /* MUTTER ntohs(ETH_P_AX25),*/
2126         0,              /* copy */
2127         kiss_rcv,
2128         NULL,
2129         NULL,
2130 };
2131 
2132 static struct packet_type bpq_packet_type = 
2133 {
2134         0,      /* MUTTER ntohs(ETH_P_BPQ),*/
2135         0,              /* copy */
2136         bpq_rcv,
2137         NULL,
2138         NULL,
2139 };
2140 
2141 static struct notifier_block ax25_dev_notifier = {
2142         ax25_device_event,
2143         0
2144 };
2145 
2146 void ax25_proto_init(struct net_proto *pro)
     /*  */
2147 {
2148         sock_register(ax25_proto_ops.family, &ax25_proto_ops);
2149         ax25_packet_type.type = htons(ETH_P_AX25);
2150         dev_add_pack(&ax25_packet_type);        
2151         bpq_packet_type.type  = htons(ETH_P_BPQ);
2152         dev_add_pack(&bpq_packet_type);
2153         register_netdevice_notifier(&ax25_dev_notifier);
2154                           
2155         proc_net_register(&(struct proc_dir_entry) {
2156                 PROC_NET_AX25_ROUTE, 10, "ax25_route",
2157                 S_IFREG | S_IRUGO, 1, 0, 0,
2158                 0, &proc_net_inode_operations,
2159                 ax25_rt_get_info
2160         });
2161         proc_net_register(&(struct proc_dir_entry) {
2162                 PROC_NET_AX25, 4, "ax25",
2163                 S_IFREG | S_IRUGO, 1, 0, 0,
2164                 0, &proc_net_inode_operations,
2165                 ax25_get_info
2166         });
2167         proc_net_register(&(struct proc_dir_entry) {
2168                 PROC_NET_AX25_CALLS, 10, "ax25_calls",
2169                 S_IFREG | S_IRUGO, 1, 0, 0,
2170                 0, &proc_net_inode_operations,
2171                 ax25_cs_get_info
2172         });
2173 
2174         printk("G4KLX/GW4PTS AX.25 for Linux. Version 0.30 ALPHA for Linux NET3.030 (Linux 1.3.20)\n");
2175 }
2176 
2177 /*
2178  *      A small shim to dev_queue_xmit to handle the difference between
2179  *      KISS AX.25 and BPQ AX.25.
2180  */
2181 void ax25_queue_xmit(struct sk_buff *skb, struct device *dev, int pri)
     /*  */
2182 {
2183         static char bcast_addr[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
2184         unsigned char *ptr;
2185         int size;
2186 
2187         if (dev->type == ARPHRD_ETHER) {
2188                 if (skb_headroom(skb) < AX25_BPQ_HEADER_LEN) {
2189                         printk("ax25_queue_xmit: not enough space to add BPQ Ether header\n");
2190                         skb->free = 1;
2191                         kfree_skb(skb, FREE_WRITE);
2192                         return;
2193                 }
2194 
2195                 size = skb->len;
2196         
2197                 ptr = skb_push(skb, 2);
2198 
2199                 *ptr++ = (size + 5) % 256;
2200                 *ptr++ = (size + 5) / 256;
2201 
2202                 dev->hard_header(skb, dev, ETH_P_BPQ, bcast_addr, NULL, 0);
2203         } else {
2204                 ptr = skb_push(skb, 1);
2205                 
2206                 *ptr++ = 0;                     /* KISS */
2207         }
2208 
2209         dev_queue_xmit(skb, dev, pri);
2210 }
2211 
2212 /*******************************************************************************************************************\
2213 *                                                                                                                   *
2214 *               Driver encapsulation support: Moved out of SLIP because a) it should be here                        *
2215 *                                                                       b) for HDLC cards                           *
2216 *                                                                                                                   *
2217 \*******************************************************************************************************************/
2218 
2219 /*
2220  *      Shove an AX.25 UI header on an IP packet and handle ARP
2221  */
2222 
2223 #ifdef CONFIG_INET
2224  
2225 int ax25_encapsulate(struct sk_buff *skb, struct device *dev, unsigned short type, void *daddr,
     /*  */
2226                 void *saddr, unsigned len)
2227 {
2228         /* header is an AX.25 UI frame from us to them */
2229         unsigned char *buff = skb_push(skb, AX25_HEADER_LEN);
2230 
2231         *buff++ = 0;    /* KISS DATA */
2232         
2233         if (daddr != NULL)
2234                 memcpy(buff, daddr, dev->addr_len);     /* Address specified */
2235 
2236         buff[6] &= ~LAPB_C;
2237         buff[6] &= ~LAPB_E;
2238         buff[6] |= SSSID_SPARE;
2239         buff += AX25_ADDR_LEN;
2240 
2241         if (saddr != NULL)
2242                 memcpy(buff, saddr, dev->addr_len);
2243         else
2244                 memcpy(buff, dev->dev_addr, dev->addr_len);
2245 
2246         buff[6] &= ~LAPB_C;
2247         buff[6] |= LAPB_E;
2248         buff[6] |= SSSID_SPARE;
2249         buff   += AX25_ADDR_LEN;
2250 
2251         *buff++ = LAPB_UI;      /* UI */
2252 
2253         /* Append a suitable AX.25 PID */
2254         switch (type) {
2255                 case ETH_P_IP:
2256                         *buff++ = AX25_P_IP;
2257                         break;
2258 
2259                 case ETH_P_ARP:
2260                         *buff++ = AX25_P_ARP;
2261                         break;
2262                 default:
2263                         *buff++ = 0;
2264                         break;
2265         }
2266         
2267         if (daddr != NULL)
2268                 return AX25_HEADER_LEN;
2269 
2270         return -AX25_HEADER_LEN;        /* Unfinished header */
2271 }
2272 
2273 int ax25_rebuild_header(unsigned char *bp, struct device *dev, unsigned long dest, struct sk_buff *skb)
     /*  */
2274 {
2275         int mode;
2276 
2277         if (arp_find(bp + 1, dest, dev, dev->pa_addr, skb))
2278                 return 1;
2279 
2280         if (bp[16] == AX25_P_IP) {
2281                 mode = ax25_ip_mode_get((ax25_address *)(bp + 1), dev);
2282                 if (mode == 'V' || mode == 'v' || (mode == ' ' && ax25_dev_get_value(dev, AX25_VALUES_IPDEFMODE) == 'V')) {
2283                         skb_device_unlock(skb);
2284                         skb_pull(skb, AX25_HEADER_LEN - 1);     /* Keep PID */
2285                         ax25_send_frame(skb, (ax25_address *)(bp + 8), (ax25_address *)(bp + 1), NULL, dev);
2286                         return 1;
2287                 }
2288         }
2289 
2290         bp[7]  &= ~LAPB_C;
2291         bp[7]  &= ~LAPB_E;
2292         bp[7]  |= SSSID_SPARE;
2293 
2294         bp[14] &= ~LAPB_C;
2295         bp[14] |= LAPB_E;
2296         bp[14] |= SSSID_SPARE;
2297 
2298         return 0;
2299 }       
2300 
2301 #endif
2302 
2303 #endif
/* */
root/net/ax25/af_ax25.c

DEFINITIONS
