root/net/core/dev.c

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DEFINITIONS

This source file includes following definitions.
  1. min
  2. dev_add_pack
  3. dev_remove_pack
  4. dev_get
  5. dev_open
  6. dev_close
  7. register_netdevice_notifier
  8. unregister_netdevice_notifier
  9. dev_queue_xmit
  10. netif_rx
  11. dev_rint
  12. dev_transmit
  13. in_net_bh
  14. net_bh
  15. dev_tint
  16. dev_ifconf
  17. sprintf_stats
  18. dev_get_info
  19. bad_mask
  20. dev_ifsioc
  21. dev_ioctl
  22. net_dev_init

   1 /*
   2  *      NET3    Protocol independent device support routines.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  *      Derived from the non IP parts of dev.c 1.0.19
  10  *              Authors:        Ross Biro, <bir7@leland.Stanford.Edu>
  11  *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
  13  *
  14  *      Additional Authors:
  15  *              Florian la Roche <rzsfl@rz.uni-sb.de>
  16  *              Alan Cox <gw4pts@gw4pts.ampr.org>
  17  *              David Hinds <dhinds@allegro.stanford.edu>
  18  *
  19  *      Changes:
  20  *              Alan Cox        :       device private ioctl copies fields back.
  21  *              Alan Cox        :       Transmit queue code does relevant stunts to
  22  *                                      keep the queue safe.
  23  *              Alan Cox        :       Fixed double lock.
  24  *              Alan Cox        :       Fixed promisc NULL pointer trap
  25  *              ????????        :       Support the full private ioctl range
  26  *              Alan Cox        :       Moved ioctl permission check into drivers
  27  *              Tim Kordas      :       SIOCADDMULTI/SIOCDELMULTI
  28  *              Alan Cox        :       100 backlog just doesn't cut it when
  29  *                                      you start doing multicast video 8)
  30  *              Alan Cox        :       Rewrote net_bh and list manager.
  31  *              Alan Cox        :       Fix ETH_P_ALL echoback lengths.
  32  *              Alan Cox        :       Took out transmit every packet pass
  33  *                                      Saved a few bytes in the ioctl handler
  34  *              Alan Cox        :       Network driver sets packet type before calling netif_rx. Saves
  35  *                                      a function call a packet.
  36  *              Alan Cox        :       Hashed net_bh()
  37  *      Richard Kooijman        :       Timestamp fixes.
  38  *              Alan Cox        :       Wrong field in SIOCGIFDSTADDR
  39  *              Alan Cox        :       Device lock protection.
  40  *              Alan Cox        :       Fixed nasty side effect of device close changes.
  41  *
  42  *      Cleaned up and recommented by Alan Cox 2nd April 1994. I hope to have
  43  *      the rest as well commented in the end.
  44  */
  45 
  46 /*
  47  *      A lot of these includes will be going walkies very soon 
  48  */
  49  
  50 #include <asm/segment.h>
  51 #include <asm/system.h>
  52 #include <asm/bitops.h>
  53 #include <linux/config.h>
  54 #include <linux/types.h>
  55 #include <linux/kernel.h>
  56 #include <linux/sched.h>
  57 #include <linux/string.h>
  58 #include <linux/mm.h>
  59 #include <linux/socket.h>
  60 #include <linux/sockios.h>
  61 #include <linux/in.h>
  62 #include <linux/errno.h>
  63 #include <linux/interrupt.h>
  64 #include <linux/if_ether.h>
  65 #include <linux/inet.h>
  66 #include <linux/netdevice.h>
  67 #include <linux/etherdevice.h>
  68 #include <linux/notifier.h>
  69 #include <net/ip.h>
  70 #include <net/route.h>
  71 #include <linux/skbuff.h>
  72 #include <net/sock.h>
  73 #include <net/arp.h>
  74 #include <linux/proc_fs.h>
  75 #include <linux/stat.h>
  76 
  77 /*
  78  *      The list of packet types we will receive (as opposed to discard)
  79  *      and the routines to invoke.
  80  */
  81 
  82 struct packet_type *ptype_base[16];
  83 struct packet_type *ptype_all = NULL;           /* Taps */
  84 
  85 /*
  86  *      Device list lock
  87  */
  88  
  89 int dev_lockct=0;
  90  
  91 /*
  92  *      Our notifier list
  93  */
  94  
  95 struct notifier_block *netdev_chain=NULL;
  96 
  97 /*
  98  *      Device drivers call our routines to queue packets here. We empty the
  99  *      queue in the bottom half handler.
 100  */
 101 
 102 static struct sk_buff_head backlog = 
 103 {
 104         (struct sk_buff *)&backlog, (struct sk_buff *)&backlog
 105 #if CONFIG_SKB_CHECK
 106         ,SK_HEAD_SKB
 107 #endif
 108 };
 109 
 110 /* 
 111  *      We don't overdo the queue or we will thrash memory badly.
 112  */
 113  
 114 static int backlog_size = 0;
 115 
 116 /*
 117  *      Return the lesser of the two values. 
 118  */
 119  
 120 static __inline__ unsigned long min(unsigned long a, unsigned long b)
     /* [previous][next][first][last][top][bottom][index][help] */
 121 {
 122         return (a < b)? a : b;
 123 }
 124 
 125 
 126 /******************************************************************************************
 127 
 128                 Protocol management and registration routines
 129 
 130 *******************************************************************************************/
 131 
 132 /*
 133  *      For efficiency
 134  */
 135 
 136 static int dev_nit=0;
 137 
 138 /*
 139  *      Add a protocol ID to the list. Now that the input handler is
 140  *      smarter we can dispense with all the messy stuff that used to be
 141  *      here.
 142  */
 143  
 144 void dev_add_pack(struct packet_type *pt)
     /* [previous][next][first][last][top][bottom][index][help] */
 145 {
 146         int hash;
 147         if(pt->type==htons(ETH_P_ALL))
 148         {
 149                 dev_nit++;
 150                 pt->next=ptype_all;
 151                 ptype_all=pt;
 152         }
 153         else
 154         {       
 155                 hash=ntohs(pt->type)&15;
 156                 pt->next = ptype_base[hash];
 157                 ptype_base[hash] = pt;
 158         }
 159 }
 160 
 161 
 162 /*
 163  *      Remove a protocol ID from the list.
 164  */
 165  
 166 void dev_remove_pack(struct packet_type *pt)
     /* [previous][next][first][last][top][bottom][index][help] */
 167 {
 168         struct packet_type **pt1;
 169         if(pt->type==htons(ETH_P_ALL))
 170         {
 171                 dev_nit--;
 172                 pt1=&ptype_all;
 173         }
 174         else
 175                 pt1=&ptype_base[ntohs(pt->type)&15];
 176         for(; (*pt1)!=NULL; pt1=&((*pt1)->next))
 177         {
 178                 if(pt==(*pt1))
 179                 {
 180                         *pt1=pt->next;
 181                         return;
 182                 }
 183         }
 184         printk("dev_remove_pack: %p not found.\n", pt);
 185 }
 186 
 187 /*****************************************************************************************
 188 
 189                             Device Interface Subroutines
 190 
 191 ******************************************************************************************/
 192 
 193 /* 
 194  *      Find an interface by name.
 195  */
 196  
 197 struct device *dev_get(const char *name)
     /* [previous][next][first][last][top][bottom][index][help] */
 198 {
 199         struct device *dev;
 200 
 201         for (dev = dev_base; dev != NULL; dev = dev->next) 
 202         {
 203                 if (strcmp(dev->name, name) == 0)
 204                         return(dev);
 205         }
 206         return(NULL);
 207 }
 208 
 209 
 210 /*
 211  *      Prepare an interface for use. 
 212  */
 213  
 214 int dev_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 215 {
 216         int ret = 0;
 217 
 218         /*
 219          *      Call device private open method
 220          */
 221         if (dev->open) 
 222                 ret = dev->open(dev);
 223 
 224         /*
 225          *      If it went open OK then set the flags
 226          */
 227          
 228         if (ret == 0) 
 229         {
 230                 dev->flags |= (IFF_UP | IFF_RUNNING);
 231                 /*
 232                  *      Initialise multicasting status 
 233                  */
 234                 dev_mc_upload(dev);
 235                 notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
 236         }
 237         return(ret);
 238 }
 239 
 240 
 241 /*
 242  *      Completely shutdown an interface.
 243  */
 244  
 245 int dev_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 246 {
 247         int ct=0;
 248 
 249         /*
 250          *      Call the device specific close. This cannot fail.
 251          *      Only if device is UP
 252          */
 253          
 254         if ((dev->flags & IFF_UP) && dev->stop)
 255                 dev->stop(dev);
 256 
 257         /*
 258          *      Device is now down.
 259          */
 260          
 261         dev->flags&=~(IFF_UP|IFF_RUNNING);
 262 
 263         /*
 264          *      Tell people we are going down
 265          */
 266         notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
 267         /*
 268          *      Flush the multicast chain
 269          */
 270         dev_mc_discard(dev);
 271         /*
 272          *      Blank the IP addresses
 273          */
 274         dev->pa_addr = 0;
 275         dev->pa_dstaddr = 0;
 276         dev->pa_brdaddr = 0;
 277         dev->pa_mask = 0;
 278         /*
 279          *      Purge any queued packets when we down the link 
 280          */
 281         while(ct<DEV_NUMBUFFS)
 282         {
 283                 struct sk_buff *skb;
 284                 while((skb=skb_dequeue(&dev->buffs[ct]))!=NULL)
 285                         if(skb->free)
 286                                 kfree_skb(skb,FREE_WRITE);
 287                 ct++;
 288         }
 289         return(0);
 290 }
 291 
 292 
 293 /*
 294  *      Device change register/unregister. These are not inline or static
 295  *      as we export them to the world.
 296  */
 297 
 298 int register_netdevice_notifier(struct notifier_block *nb)
     /* [previous][next][first][last][top][bottom][index][help] */
 299 {
 300         return notifier_chain_register(&netdev_chain, nb);
 301 }
 302 
 303 int unregister_netdevice_notifier(struct notifier_block *nb)
     /* [previous][next][first][last][top][bottom][index][help] */
 304 {
 305         return notifier_chain_unregister(&netdev_chain,nb);
 306 }
 307 
 308 
 309 
 310 /*
 311  *      Send (or queue for sending) a packet. 
 312  *
 313  *      IMPORTANT: When this is called to resend frames. The caller MUST
 314  *      already have locked the sk_buff. Apart from that we do the
 315  *      rest of the magic.
 316  */
 317 
 318 void dev_queue_xmit(struct sk_buff *skb, struct device *dev, int pri)
     /* [previous][next][first][last][top][bottom][index][help] */
 319 {
 320         unsigned long flags;
 321         struct packet_type *ptype;
 322         int where = 0;          /* used to say if the packet should go  */
 323                                 /* at the front or the back of the      */
 324                                 /* queue - front is a retransmit try    */
 325 
 326         if(pri>=0 && !skb_device_locked(skb))
 327                 skb_device_lock(skb);   /* Shove a lock on the frame */
 328 #if CONFIG_SKB_CHECK 
 329         IS_SKB(skb);
 330 #endif    
 331         skb->dev = dev;
 332 
 333         /*
 334          *      Negative priority is used to flag a frame that is being pulled from the
 335          *      queue front as a retransmit attempt. It therefore goes back on the queue
 336          *      start on a failure.
 337          */
 338          
 339         if (pri < 0) 
 340         {
 341                 pri = -pri-1;
 342                 where = 1;
 343         }
 344 
 345 #ifdef CONFIG_NET_DEBUG
 346         if (pri >= DEV_NUMBUFFS) 
 347         {
 348                 printk("bad priority in dev_queue_xmit.\n");
 349                 pri = 1;
 350         }
 351 #endif
 352 
 353         /*
 354          *      If the address has not been resolved. Call the device header rebuilder.
 355          *      This can cover all protocols and technically not just ARP either.
 356          */
 357          
 358         if (!skb->arp && dev->rebuild_header(skb->data, dev, skb->raddr, skb)) {
 359                 return;
 360         }
 361 
 362         save_flags(flags);
 363         cli();  
 364         if (!where)             /* Always keep order. It helps other hosts
 365                                            far more than it costs us */
 366         {
 367                 skb_queue_tail(dev->buffs + pri,skb);
 368                 skb_device_unlock(skb);         /* Buffer is on the device queue and can be freed safely */
 369                 skb = skb_dequeue(dev->buffs + pri);
 370                 skb_device_lock(skb);           /* New buffer needs locking down */
 371         }
 372         restore_flags(flags);
 373 
 374         /* copy outgoing packets to any sniffer packet handlers */
 375         if(!where && dev_nit)
 376         {
 377                 skb->stamp=xtime;
 378                 for (ptype = ptype_all; ptype!=NULL; ptype = ptype->next) 
 379                 {
 380                         /* Never send packets back to the socket
 381                          * they originated from - MvS (miquels@drinkel.ow.org)
 382                          */
 383                         if ((ptype->dev == dev || !ptype->dev) &&
 384                            ((struct sock *)ptype->data != skb->sk))
 385                         {
 386                                 struct sk_buff *skb2;
 387                                 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL)
 388                                         break;
 389                                 skb2->h.raw = skb2->data + dev->hard_header_len;
 390                                 skb2->mac.raw = skb2->data;
 391                                 ptype->func(skb2, skb->dev, ptype);
 392                         }
 393                 }
 394         }
 395         start_bh_atomic();
 396         if (dev->hard_start_xmit(skb, dev) == 0) {
 397                 /*
 398                  *      Packet is now solely the responsibility of the driver
 399                  */
 400                 end_bh_atomic();
 401                 return;
 402         }
 403         end_bh_atomic();
 404 
 405         /*
 406          *      Transmission failed, put skb back into a list. Once on the list it's safe and
 407          *      no longer device locked (it can be freed safely from the device queue)
 408          */
 409         cli();
 410         skb_device_unlock(skb);
 411         skb_queue_head(dev->buffs + pri,skb);
 412         restore_flags(flags);
 413 }
 414 
 415 /*
 416  *      Receive a packet from a device driver and queue it for the upper
 417  *      (protocol) levels.  It always succeeds. This is the recommended 
 418  *      interface to use.
 419  */
 420 
 421 void netif_rx(struct sk_buff *skb)
     /* [previous][next][first][last][top][bottom][index][help] */
 422 {
 423         static int dropping = 0;
 424 
 425         /*
 426          *      Any received buffers are un-owned and should be discarded
 427          *      when freed. These will be updated later as the frames get
 428          *      owners.
 429          */
 430         skb->sk = NULL;
 431         skb->free = 1;
 432         if(skb->stamp.tv_sec==0)
 433                 skb->stamp = xtime;
 434 
 435         /*
 436          *      Check that we aren't overdoing things.
 437          */
 438 
 439         if (!backlog_size)
 440                 dropping = 0;
 441         else if (backlog_size > 300)
 442                 dropping = 1;
 443 
 444         if (dropping) 
 445         {
 446                 kfree_skb(skb, FREE_READ);
 447                 return;
 448         }
 449 
 450         /*
 451          *      Add it to the "backlog" queue. 
 452          */
 453 #if CONFIG_SKB_CHECK
 454         IS_SKB(skb);
 455 #endif  
 456         skb_queue_tail(&backlog,skb);
 457         backlog_size++;
 458   
 459         /*
 460          *      If any packet arrived, mark it for processing after the
 461          *      hardware interrupt returns.
 462          */
 463 
 464 #ifdef CONFIG_NET_RUNONIRQ      /* Dont enable yet, needs some driver mods */
 465         net_bh();
 466 #else
 467         mark_bh(NET_BH);
 468 #endif
 469         return;
 470 }
 471 
 472 
 473 /*
 474  *      The old interface to fetch a packet from a device driver.
 475  *      This function is the base level entry point for all drivers that
 476  *      want to send a packet to the upper (protocol) levels.  It takes
 477  *      care of de-multiplexing the packet to the various modules based
 478  *      on their protocol ID.
 479  *
 480  *      Return values:  1 <- exit I can't do any more
 481  *                      0 <- feed me more (i.e. "done", "OK"). 
 482  *
 483  *      This function is OBSOLETE and should not be used by any new
 484  *      device.
 485  */
 486 
 487 int dev_rint(unsigned char *buff, long len, int flags, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 488 {
 489         static int dropping = 0;
 490         struct sk_buff *skb = NULL;
 491         unsigned char *to;
 492         int amount, left;
 493         int len2;
 494 
 495         if (dev == NULL || buff == NULL || len <= 0) 
 496                 return(1);
 497 
 498         if (flags & IN_SKBUFF) 
 499         {
 500                 skb = (struct sk_buff *) buff;
 501         }
 502         else
 503         {
 504                 if (dropping) 
 505                 {
 506                         if (skb_peek(&backlog) != NULL)
 507                                 return(1);
 508                         printk("INET: dev_rint: no longer dropping packets.\n");
 509                         dropping = 0;
 510                 }
 511 
 512                 skb = alloc_skb(len, GFP_ATOMIC);
 513                 if (skb == NULL) 
 514                 {
 515                         printk("dev_rint: packet dropped on %s (no memory) !\n",
 516                                dev->name);
 517                         dropping = 1;
 518                         return(1);
 519                 }
 520 
 521                 /* 
 522                  *      First we copy the packet into a buffer, and save it for later. We
 523                  *      in effect handle the incoming data as if it were from a circular buffer
 524                  */
 525 
 526                 to = skb_put(skb,len);
 527                 left = len;
 528 
 529                 len2 = len;
 530                 while (len2 > 0) 
 531                 {
 532                         amount = min(len2, (unsigned long) dev->rmem_end -
 533                                                 (unsigned long) buff);
 534                         memcpy(to, buff, amount);
 535                         len2 -= amount;
 536                         left -= amount;
 537                         buff += amount;
 538                         to += amount;
 539                         if ((unsigned long) buff == dev->rmem_end)
 540                                 buff = (unsigned char *) dev->rmem_start;
 541                 }
 542         }
 543 
 544         /*
 545          *      Tag the frame and kick it to the proper receive routine
 546          */
 547          
 548         skb->dev = dev;
 549         skb->free = 1;
 550 
 551         netif_rx(skb);
 552         /*
 553          *      OK, all done. 
 554          */
 555         return(0);
 556 }
 557 
 558 
 559 /*
 560  *      This routine causes all interfaces to try to send some data. 
 561  */
 562  
 563 void dev_transmit(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 564 {
 565         struct device *dev;
 566 
 567         for (dev = dev_base; dev != NULL; dev = dev->next) 
 568         {
 569                 if (dev->flags != 0 && !dev->tbusy) {
 570                         /*
 571                          *      Kick the device
 572                          */
 573                         dev_tint(dev);
 574                 }
 575         }
 576 }
 577 
 578 
 579 /**********************************************************************************
 580 
 581                         Receive Queue Processor
 582                         
 583 ***********************************************************************************/
 584 
 585 /*
 586  *      This is a single non-reentrant routine which takes the received packet
 587  *      queue and throws it at the networking layers in the hope that something
 588  *      useful will emerge.
 589  */
 590  
 591 volatile char in_bh = 0;        /* Non-reentrant remember */
 592 
 593 int in_net_bh() /* Used by timer.c */
     /* [previous][next][first][last][top][bottom][index][help] */
 594 {
 595         return(in_bh==0?0:1);
 596 }
 597 
 598 /*
 599  *      When we are called the queue is ready to grab, the interrupts are
 600  *      on and hardware can interrupt and queue to the receive queue a we
 601  *      run with no problems.
 602  *      This is run as a bottom half after an interrupt handler that does
 603  *      mark_bh(NET_BH);
 604  */
 605  
 606 void net_bh(void *tmp)
     /* [previous][next][first][last][top][bottom][index][help] */
 607 {
 608         struct sk_buff *skb;
 609         struct packet_type *ptype;
 610         struct packet_type *pt_prev;
 611         unsigned short type;
 612 
 613         /*
 614          *      Atomically check and mark our BUSY state. 
 615          */
 616 
 617         if (set_bit(1, (void*)&in_bh))
 618                 return;
 619 
 620         /*
 621          *      Can we send anything now? We want to clear the
 622          *      decks for any more sends that get done as we
 623          *      process the input. This also minimises the
 624          *      latency on a transmit interrupt bh.
 625          */
 626 
 627         dev_transmit();
 628   
 629         /*
 630          *      Any data left to process. This may occur because a
 631          *      mark_bh() is done after we empty the queue including
 632          *      that from the device which does a mark_bh() just after
 633          */
 634 
 635         cli();
 636         
 637         /*
 638          *      While the queue is not empty
 639          */
 640          
 641         while((skb=skb_dequeue(&backlog))!=NULL)
 642         {
 643                 /*
 644                  *      We have a packet. Therefore the queue has shrunk
 645                  */
 646                 backlog_size--;
 647 
 648                 sti();
 649                 
 650                /*
 651                 *       Bump the pointer to the next structure.
 652                 *
 653                 *       On entry to the protocol layer. skb->data and
 654                 *       skb->h.raw point to the MAC and encapsulated data
 655                 */
 656 
 657                 skb->h.raw = skb->data;
 658 
 659                /*
 660                 *       Fetch the packet protocol ID. 
 661                 */
 662                 
 663                 type = skb->protocol;
 664 
 665                 /*
 666                  *      We got a packet ID.  Now loop over the "known protocols"
 667                  *      list. There are two lists. The ptype_all list of taps (normally empty)
 668                  *      and the main protocol list which is hashed perfectly for normal protocols.
 669                  */
 670                 pt_prev = NULL;
 671                 for (ptype = ptype_all; ptype!=NULL; ptype=ptype->next)
 672                 {
 673                         if(pt_prev)
 674                         {
 675                                 struct sk_buff *skb2=skb_clone(skb, GFP_ATOMIC);
 676                                 if(skb2)
 677                                         pt_prev->func(skb2,skb->dev, pt_prev);
 678                         }
 679                         pt_prev=ptype;
 680                 }
 681                 
 682                 for (ptype = ptype_base[ntohs(type)&15]; ptype != NULL; ptype = ptype->next) 
 683                 {
 684                         if (ptype->type == type && (!ptype->dev || ptype->dev==skb->dev))
 685                         {
 686                                 /*
 687                                  *      We already have a match queued. Deliver
 688                                  *      to it and then remember the new match
 689                                  */
 690                                 if(pt_prev)
 691                                 {
 692                                         struct sk_buff *skb2;
 693 
 694                                         skb2=skb_clone(skb, GFP_ATOMIC);
 695 
 696                                         /*
 697                                          *      Kick the protocol handler. This should be fast
 698                                          *      and efficient code.
 699                                          */
 700 
 701                                         if(skb2)
 702                                                 pt_prev->func(skb2, skb->dev, pt_prev);
 703                                 }
 704                                 /* Remember the current last to do */
 705                                 pt_prev=ptype;
 706                         }
 707                 } /* End of protocol list loop */
 708                 
 709                 /*
 710                  *      Is there a last item to send to ?
 711                  */
 712 
 713                 if(pt_prev)
 714                         pt_prev->func(skb, skb->dev, pt_prev);
 715                 /*
 716                  *      Has an unknown packet has been received ?
 717                  */
 718          
 719                 else
 720                         kfree_skb(skb, FREE_WRITE);
 721 
 722                 /*
 723                  *      Again, see if we can transmit anything now. 
 724                  *      [Ought to take this out judging by tests it slows
 725                  *       us down not speeds us up]
 726                  */
 727 #ifdef CONFIG_XMIT_EVERY
 728                 dev_transmit();
 729 #endif          
 730                 cli();
 731         }       /* End of queue loop */
 732         
 733         /*
 734          *      We have emptied the queue
 735          */
 736          
 737         in_bh = 0;
 738         sti();
 739         
 740         /*
 741          *      One last output flush.
 742          */
 743          
 744         dev_transmit();
 745 }
 746 
 747 
 748 /*
 749  *      This routine is called when an device driver (i.e. an
 750  *      interface) is ready to transmit a packet.
 751  */
 752  
 753 void dev_tint(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 754 {
 755         int i;
 756         struct sk_buff *skb;
 757         unsigned long flags;
 758         
 759         save_flags(flags);      
 760         /*
 761          *      Work the queues in priority order
 762          */
 763          
 764         for(i = 0;i < DEV_NUMBUFFS; i++) 
 765         {
 766                 /*
 767                  *      Pull packets from the queue
 768                  */
 769                  
 770 
 771                 cli();
 772                 while((skb=skb_dequeue(&dev->buffs[i]))!=NULL)
 773                 {
 774                         /*
 775                          *      Stop anyone freeing the buffer while we retransmit it
 776                          */
 777                         skb_device_lock(skb);
 778                         restore_flags(flags);
 779                         /*
 780                          *      Feed them to the output stage and if it fails
 781                          *      indicate they re-queue at the front.
 782                          */
 783                         dev_queue_xmit(skb,dev,-i - 1);
 784                         /*
 785                          *      If we can take no more then stop here.
 786                          */
 787                         if (dev->tbusy)
 788                                 return;
 789                         cli();
 790                 }
 791         }
 792         restore_flags(flags);
 793 }
 794 
 795 
 796 /*
 797  *      Perform a SIOCGIFCONF call. This structure will change
 798  *      size shortly, and there is nothing I can do about it.
 799  *      Thus we will need a 'compatibility mode'.
 800  */
 801 
 802 static int dev_ifconf(char *arg)
     /* [previous][next][first][last][top][bottom][index][help] */
 803 {
 804         struct ifconf ifc;
 805         struct ifreq ifr;
 806         struct device *dev;
 807         char *pos;
 808         int len;
 809         int err;
 810 
 811         /*
 812          *      Fetch the caller's info block. 
 813          */
 814          
 815         err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifconf));
 816         if(err)
 817                 return err;
 818         memcpy_fromfs(&ifc, arg, sizeof(struct ifconf));
 819         len = ifc.ifc_len;
 820         pos = ifc.ifc_buf;
 821 
 822         /*
 823          *      We now walk the device list filling each active device
 824          *      into the array.
 825          */
 826          
 827         err=verify_area(VERIFY_WRITE,pos,len);
 828         if(err)
 829                 return err;
 830         
 831         /*
 832          *      Loop over the interfaces, and write an info block for each. 
 833          */
 834 
 835         for (dev = dev_base; dev != NULL; dev = dev->next) 
 836         {
 837                 if(!(dev->flags & IFF_UP))      /* Downed devices don't count */
 838                         continue;
 839                 memset(&ifr, 0, sizeof(struct ifreq));
 840                 strcpy(ifr.ifr_name, dev->name);
 841                 (*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = dev->family;
 842                 (*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
 843 
 844                 /*
 845                  *      Have we run out of space here ?
 846                  */
 847         
 848                 if (len < sizeof(struct ifreq)) 
 849                         break;
 850 
 851                 /*
 852                  *      Write this block to the caller's space. 
 853                  */
 854                  
 855                 memcpy_tofs(pos, &ifr, sizeof(struct ifreq));
 856                 pos += sizeof(struct ifreq);
 857                 len -= sizeof(struct ifreq);            
 858         }
 859 
 860         /*
 861          *      All done.  Write the updated control block back to the caller. 
 862          */
 863          
 864         ifc.ifc_len = (pos - ifc.ifc_buf);
 865         ifc.ifc_req = (struct ifreq *) ifc.ifc_buf;
 866         memcpy_tofs(arg, &ifc, sizeof(struct ifconf));
 867         
 868         /*
 869          *      Report how much was filled in
 870          */
 871          
 872         return(pos - arg);
 873 }
 874 
 875 
 876 /*
 877  *      This is invoked by the /proc filesystem handler to display a device
 878  *      in detail.
 879  */
 880 
 881 static int sprintf_stats(char *buffer, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 882 {
 883         struct enet_statistics *stats = (dev->get_stats ? dev->get_stats(dev): NULL);
 884         int size;
 885         
 886         if (stats)
 887                 size = sprintf(buffer, "%6s:%7d %4d %4d %4d %4d %8d %4d %4d %4d %5d %4d\n",
 888                    dev->name,
 889                    stats->rx_packets, stats->rx_errors,
 890                    stats->rx_dropped + stats->rx_missed_errors,
 891                    stats->rx_fifo_errors,
 892                    stats->rx_length_errors + stats->rx_over_errors
 893                    + stats->rx_crc_errors + stats->rx_frame_errors,
 894                    stats->tx_packets, stats->tx_errors, stats->tx_dropped,
 895                    stats->tx_fifo_errors, stats->collisions,
 896                    stats->tx_carrier_errors + stats->tx_aborted_errors
 897                    + stats->tx_window_errors + stats->tx_heartbeat_errors);
 898         else
 899                 size = sprintf(buffer, "%6s: No statistics available.\n", dev->name);
 900 
 901         return size;
 902 }
 903 
 904 /*
 905  *      Called from the PROCfs module. This now uses the new arbitrary sized /proc/net interface
 906  *      to create /proc/net/dev
 907  */
 908  
 909 int dev_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
 910 {
 911         int len=0;
 912         off_t begin=0;
 913         off_t pos=0;
 914         int size;
 915         
 916         struct device *dev;
 917 
 918 
 919         size = sprintf(buffer, "Inter-|   Receive                  |  Transmit\n"
 920                             " face |packets errs drop fifo frame|packets errs drop fifo colls carrier\n");
 921         
 922         pos+=size;
 923         len+=size;
 924         
 925 
 926         for (dev = dev_base; dev != NULL; dev = dev->next) 
 927         {
 928                 size = sprintf_stats(buffer+len, dev);
 929                 len+=size;
 930                 pos=begin+len;
 931                                 
 932                 if(pos<offset)
 933                 {
 934                         len=0;
 935                         begin=pos;
 936                 }
 937                 if(pos>offset+length)
 938                         break;
 939         }
 940         
 941         *start=buffer+(offset-begin);   /* Start of wanted data */
 942         len-=(offset-begin);            /* Start slop */
 943         if(len>length)
 944                 len=length;             /* Ending slop */
 945         return len;
 946 }
 947 
 948 
 949 /*
 950  *      This checks bitmasks for the ioctl calls for devices.
 951  */
 952  
 953 static inline int bad_mask(unsigned long mask, unsigned long addr)
     /* [previous][next][first][last][top][bottom][index][help] */
 954 {
 955         if (addr & (mask = ~mask))
 956                 return 1;
 957         mask = ntohl(mask);
 958         if (mask & (mask+1))
 959                 return 1;
 960         return 0;
 961 }
 962 
 963 /*
 964  *      Perform the SIOCxIFxxx calls. 
 965  *
 966  *      The socket layer has seen an ioctl the address family thinks is
 967  *      for the device. At this point we get invoked to make a decision
 968  */
 969  
 970 static int dev_ifsioc(void *arg, unsigned int getset)
     /* [previous][next][first][last][top][bottom][index][help] */
 971 {
 972         struct ifreq ifr;
 973         struct device *dev;
 974         int ret;
 975 
 976         /*
 977          *      Fetch the caller's info block into kernel space
 978          */
 979 
 980         int err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifreq));
 981         if(err)
 982                 return err;
 983         
 984         memcpy_fromfs(&ifr, arg, sizeof(struct ifreq));
 985 
 986         /*
 987          *      See which interface the caller is talking about. 
 988          */
 989          
 990         if ((dev = dev_get(ifr.ifr_name)) == NULL) 
 991                 return(-ENODEV);
 992 
 993         switch(getset) 
 994         {
 995                 case SIOCGIFFLAGS:      /* Get interface flags */
 996                         ifr.ifr_flags = dev->flags;
 997                         goto rarok;
 998 
 999                 case SIOCSIFFLAGS:      /* Set interface flags */
1000                         {
1001                                 int old_flags = dev->flags;
1002                                 
1003                                 /*
1004                                  *      We are not allowed to potentially close/unload
1005                                  *      a device until we get this lock.
1006                                  */
1007                                 
1008                                 dev_lock_wait();
1009                                 
1010                                 /*
1011                                  *      Set the flags on our device.
1012                                  */
1013                                  
1014                                 dev->flags = (ifr.ifr_flags & (
1015                                         IFF_BROADCAST | IFF_DEBUG | IFF_LOOPBACK |
1016                                         IFF_POINTOPOINT | IFF_NOTRAILERS | IFF_RUNNING |
1017                                         IFF_NOARP | IFF_PROMISC | IFF_ALLMULTI | IFF_SLAVE | IFF_MASTER
1018                                         | IFF_MULTICAST)) | (dev->flags & IFF_UP);
1019                                 /*
1020                                  *      Load in the correct multicast list now the flags have changed.
1021                                  */                             
1022 
1023                                 dev_mc_upload(dev);
1024 
1025                                 /*
1026                                  *      Have we downed the interface. We handle IFF_UP ourselves
1027                                  *      according to user attempts to set it, rather than blindly
1028                                  *      setting it.
1029                                  */
1030                                  
1031                                 if ((old_flags^ifr.ifr_flags)&IFF_UP)   /* Bit is different  ? */
1032                                 {
1033                                         if(old_flags&IFF_UP)            /* Gone down */
1034                                                 ret=dev_close(dev);             
1035                                         else                            /* Come up */
1036                                         {
1037                                                 ret=dev_open(dev);
1038                                                 if(ret<0)
1039                                                         dev->flags&=~IFF_UP;    /* Open failed */
1040                                         }       
1041                                 }
1042                                 else
1043                                         ret=0;
1044                                 /*
1045                                  *      Load in the correct multicast list now the flags have changed.
1046                                  */                             
1047 
1048                                 dev_mc_upload(dev);
1049                         }
1050                         break;
1051                 
1052                 case SIOCGIFADDR:       /* Get interface address (and family) */
1053                         (*(struct sockaddr_in *)
1054                                   &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
1055                         (*(struct sockaddr_in *)
1056                                   &ifr.ifr_addr).sin_family = dev->family;
1057                         (*(struct sockaddr_in *)
1058                                   &ifr.ifr_addr).sin_port = 0;
1059                         goto rarok;
1060         
1061                 case SIOCSIFADDR:       /* Set interface address (and family) */
1062                         dev->pa_addr = (*(struct sockaddr_in *)
1063                                  &ifr.ifr_addr).sin_addr.s_addr;
1064                         dev->family = ifr.ifr_addr.sa_family;
1065                         
1066 #ifdef CONFIG_INET      
1067                         /* This is naughty. When net-032e comes out It wants moving into the net032
1068                            code not the kernel. Till then it can sit here (SIGH) */             
1069                         dev->pa_mask = ip_get_mask(dev->pa_addr);
1070 #endif                  
1071                         dev->pa_brdaddr = dev->pa_addr | ~dev->pa_mask;
1072                         ret = 0;
1073                         break;
1074                         
1075                 case SIOCGIFBRDADDR:    /* Get the broadcast address */
1076                         (*(struct sockaddr_in *)
1077                                 &ifr.ifr_broadaddr).sin_addr.s_addr = dev->pa_brdaddr;
1078                         (*(struct sockaddr_in *)
1079                                 &ifr.ifr_broadaddr).sin_family = dev->family;
1080                         (*(struct sockaddr_in *)
1081                                 &ifr.ifr_broadaddr).sin_port = 0;
1082                         goto rarok;
1083 
1084                 case SIOCSIFBRDADDR:    /* Set the broadcast address */
1085                         dev->pa_brdaddr = (*(struct sockaddr_in *)
1086                                 &ifr.ifr_broadaddr).sin_addr.s_addr;
1087                         ret = 0;
1088                         break;
1089                         
1090                 case SIOCGIFDSTADDR:    /* Get the destination address (for point-to-point links) */
1091                         (*(struct sockaddr_in *)
1092                                 &ifr.ifr_dstaddr).sin_addr.s_addr = dev->pa_dstaddr;
1093                         (*(struct sockaddr_in *)
1094                                 &ifr.ifr_dstaddr).sin_family = dev->family;
1095                         (*(struct sockaddr_in *)
1096                                 &ifr.ifr_dstaddr).sin_port = 0;
1097                         goto rarok;
1098         
1099                 case SIOCSIFDSTADDR:    /* Set the destination address (for point-to-point links) */
1100                         dev->pa_dstaddr = (*(struct sockaddr_in *)
1101                                 &ifr.ifr_dstaddr).sin_addr.s_addr;
1102                         ret = 0;
1103                         break;
1104                         
1105                 case SIOCGIFNETMASK:    /* Get the netmask for the interface */
1106                         (*(struct sockaddr_in *)
1107                                 &ifr.ifr_netmask).sin_addr.s_addr = dev->pa_mask;
1108                         (*(struct sockaddr_in *)
1109                                 &ifr.ifr_netmask).sin_family = dev->family;
1110                         (*(struct sockaddr_in *)
1111                                 &ifr.ifr_netmask).sin_port = 0;
1112                         goto rarok;
1113 
1114                 case SIOCSIFNETMASK:    /* Set the netmask for the interface */
1115                         {
1116                                 unsigned long mask = (*(struct sockaddr_in *)
1117                                         &ifr.ifr_netmask).sin_addr.s_addr;
1118                                 ret = -EINVAL;
1119                                 /*
1120                                  *      The mask we set must be legal.
1121                                  */
1122                                 if (bad_mask(mask,0))
1123                                         break;
1124                                 dev->pa_mask = mask;
1125                                 ret = 0;
1126                         }
1127                         break;
1128                         
1129                 case SIOCGIFMETRIC:     /* Get the metric on the interface (currently unused) */
1130                         
1131                         ifr.ifr_metric = dev->metric;
1132                         goto  rarok;
1133                         
1134                 case SIOCSIFMETRIC:     /* Set the metric on the interface (currently unused) */
1135                         dev->metric = ifr.ifr_metric;
1136                         ret=0;
1137                         break;
1138         
1139                 case SIOCGIFMTU:        /* Get the MTU of a device */
1140                         ifr.ifr_mtu = dev->mtu;
1141                         goto rarok;
1142         
1143                 case SIOCSIFMTU:        /* Set the MTU of a device */
1144                 
1145                         /*
1146                          *      MTU must be positive.
1147                          */
1148                          
1149                         if(ifr.ifr_mtu<68)
1150                                 return -EINVAL;
1151                         dev->mtu = ifr.ifr_mtu;
1152                         ret = 0;
1153                         break;
1154         
1155                 case SIOCGIFMEM:        /* Get the per device memory space. We can add this but currently
1156                                            do not support it */
1157                         ret = -EINVAL;
1158                         break;
1159                 
1160                 case SIOCSIFMEM:        /* Set the per device memory buffer space. Not applicable in our case */
1161                         ret = -EINVAL;
1162                         break;
1163 
1164                 case OLD_SIOCGIFHWADDR: /* Get the hardware address. This will change and SIFHWADDR will be added */
1165                         memcpy(ifr.old_ifr_hwaddr,dev->dev_addr, MAX_ADDR_LEN);
1166                         goto rarok;
1167 
1168                 case SIOCGIFHWADDR:
1169                         memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
1170                         ifr.ifr_hwaddr.sa_family=dev->type;                     
1171                         goto rarok;
1172                                 
1173                 case SIOCSIFHWADDR:
1174                         if(dev->set_mac_address==NULL)
1175                                 return -EOPNOTSUPP;
1176                         if(ifr.ifr_hwaddr.sa_family!=dev->type)
1177                                 return -EINVAL;
1178                         ret=dev->set_mac_address(dev,ifr.ifr_hwaddr.sa_data);
1179                         break;
1180                         
1181                 case SIOCGIFMAP:
1182                         ifr.ifr_map.mem_start=dev->mem_start;
1183                         ifr.ifr_map.mem_end=dev->mem_end;
1184                         ifr.ifr_map.base_addr=dev->base_addr;
1185                         ifr.ifr_map.irq=dev->irq;
1186                         ifr.ifr_map.dma=dev->dma;
1187                         ifr.ifr_map.port=dev->if_port;
1188                         goto rarok;
1189                         
1190                 case SIOCSIFMAP:
1191                         if(dev->set_config==NULL)
1192                                 return -EOPNOTSUPP;
1193                         return dev->set_config(dev,&ifr.ifr_map);
1194                         
1195                 case SIOCADDMULTI:
1196                         if(dev->set_multicast_list==NULL)
1197                                 return -EINVAL;
1198                         if(ifr.ifr_hwaddr.sa_family!=AF_UNSPEC)
1199                                 return -EINVAL;
1200                         dev_mc_add(dev,ifr.ifr_hwaddr.sa_data, dev->addr_len, 1);
1201                         return 0;
1202 
1203                 case SIOCDELMULTI:
1204                         if(dev->set_multicast_list==NULL)
1205                                 return -EINVAL;
1206                         if(ifr.ifr_hwaddr.sa_family!=AF_UNSPEC)
1207                                 return -EINVAL;
1208                         dev_mc_delete(dev,ifr.ifr_hwaddr.sa_data,dev->addr_len, 1);
1209                         return 0;
1210                 /*
1211                  *      Unknown or private ioctl
1212                  */
1213 
1214                 default:
1215                         if((getset >= SIOCDEVPRIVATE) &&
1216                            (getset <= (SIOCDEVPRIVATE + 15))) {
1217                                 if(dev->do_ioctl==NULL)
1218                                         return -EOPNOTSUPP;
1219                                 ret=dev->do_ioctl(dev, &ifr, getset);
1220                                 memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
1221                                 break;
1222                         }
1223                         
1224                         ret = -EINVAL;
1225         }
1226         return(ret);
1227 /*
1228  *      The load of calls that return an ifreq and ok (saves memory).
1229  */
1230 rarok:
1231         memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1232         return 0;
1233 }
1234 
1235 
1236 /*
1237  *      This function handles all "interface"-type I/O control requests. The actual
1238  *      'doing' part of this is dev_ifsioc above.
1239  */
1240 
1241 int dev_ioctl(unsigned int cmd, void *arg)
     /* [previous][next][first][last][top][bottom][index][help] */
1242 {
1243         switch(cmd) 
1244         {
1245                 case SIOCGIFCONF:
1246                         (void) dev_ifconf((char *) arg);
1247                         return 0;
1248 
1249                 /*
1250                  *      Ioctl calls that can be done by all.
1251                  */
1252                  
1253                 case SIOCGIFFLAGS:
1254                 case SIOCGIFADDR:
1255                 case SIOCGIFDSTADDR:
1256                 case SIOCGIFBRDADDR:
1257                 case SIOCGIFNETMASK:
1258                 case SIOCGIFMETRIC:
1259                 case SIOCGIFMTU:
1260                 case SIOCGIFMEM:
1261                 case SIOCGIFHWADDR:
1262                 case SIOCSIFHWADDR:
1263                 case OLD_SIOCGIFHWADDR:
1264                 case SIOCGIFSLAVE:
1265                 case SIOCGIFMAP:
1266                         return dev_ifsioc(arg, cmd);
1267 
1268                 /*
1269                  *      Ioctl calls requiring the power of a superuser
1270                  */
1271                  
1272                 case SIOCSIFFLAGS:
1273                 case SIOCSIFADDR:
1274                 case SIOCSIFDSTADDR:
1275                 case SIOCSIFBRDADDR:
1276                 case SIOCSIFNETMASK:
1277                 case SIOCSIFMETRIC:
1278                 case SIOCSIFMTU:
1279                 case SIOCSIFMEM:
1280                 case SIOCSIFMAP:
1281                 case SIOCSIFSLAVE:
1282                 case SIOCADDMULTI:
1283                 case SIOCDELMULTI:
1284                         if (!suser())
1285                                 return -EPERM;
1286                         return dev_ifsioc(arg, cmd);
1287         
1288                 case SIOCSIFLINK:
1289                         return -EINVAL;
1290 
1291                 /*
1292                  *      Unknown or private ioctl.
1293                  */     
1294                  
1295                 default:
1296                         if((cmd >= SIOCDEVPRIVATE) &&
1297                            (cmd <= (SIOCDEVPRIVATE + 15))) {
1298                                 return dev_ifsioc(arg, cmd);
1299                         }
1300                         return -EINVAL;
1301         }
1302 }
1303 
1304 
1305 /*
1306  *      Initialize the DEV module. At boot time this walks the device list and
1307  *      unhooks any devices that fail to initialise (normally hardware not 
1308  *      present) and leaves us with a valid list of present and active devices.
1309  *
1310  */
1311 extern int lance_init(void);
1312 extern int pi_init(void);
1313 extern int dec21040_init(void);
1314 
1315 int net_dev_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1316 {
1317         struct device *dev, **dp;
1318 
1319         /*
1320          * This is VeryUgly(tm).
1321          *
1322          * Some devices want to be initialized eary..
1323          */
1324 #if defined(CONFIG_LANCE)
1325         lance_init();
1326 #endif
1327 #if defined(CONFIG_PI)
1328         pi_init();
1329 #endif  
1330 #if defined(CONFIG_DEC_ELCP)
1331         dec21040_init();
1332 #endif  
1333 
1334         /*
1335          *      Add the devices.
1336          *      If the call to dev->init fails, the dev is removed
1337          *      from the chain disconnecting the device until the
1338          *      next reboot.
1339          */
1340 
1341         dp = &dev_base;
1342         while ((dev = *dp) != NULL)
1343         {
1344                 int i;
1345                 for (i = 0; i < DEV_NUMBUFFS; i++)  {
1346                         skb_queue_head_init(dev->buffs + i);
1347                 }
1348 
1349                 if (dev->init && dev->init(dev)) 
1350                 {
1351                         /*
1352                          *      It failed to come up. Unhook it.
1353                          */
1354                         *dp = dev->next;
1355                 } 
1356                 else
1357                 {
1358                         dp = &dev->next;
1359                 }
1360         }
1361 
1362         proc_net_register(&(struct proc_dir_entry) {
1363                 PROC_NET_DEV, 3, "dev",
1364                 S_IFREG | S_IRUGO, 1, 0, 0,
1365                 0, &proc_net_inode_operations,
1366                 dev_get_info
1367         });
1368 
1369         bh_base[NET_BH].routine = net_bh;
1370         enable_bh(NET_BH);
1371         return 0;
1372 }

/* [previous][next][first][last][top][bottom][index][help] */