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*/
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)
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*/
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]](../icons/left.png)
*/
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)
/* */
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)
/* */
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)
/* */
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 #ifdef CONFIG_IP_MULTICAST
235 /*
236 * Join the all host group
237 */
238 ip_mc_allhost(dev);
239 #endif
240 dev_mc_upload(dev);
241 notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
242 }
243 return(ret);
244 }
245
246
247 /*
248 * Completely shutdown an interface.
249 */
250
251 int dev_close(struct device *dev)
/* */
252 {
253 int ct=0;
254
255 /*
256 * Call the device specific close. This cannot fail.
257 * Only if device is UP
258 */
259 if ((dev->flags & IFF_UP) && dev->stop)
260 dev->stop(dev);
261
262 dev->flags = 0;
263
264 /*
265 * Tell people we are going down
266 */
267 notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
268 /*
269 * Flush the multicast chain
270 */
271 dev_mc_discard(dev);
272 /*
273 * Blank the IP addresses
274 */
275 dev->pa_addr = 0;
276 dev->pa_dstaddr = 0;
277 dev->pa_brdaddr = 0;
278 dev->pa_mask = 0;
279 /*
280 * Purge any queued packets when we down the link
281 */
282 while(ct<DEV_NUMBUFFS)
283 {
284 struct sk_buff *skb;
285 while((skb=skb_dequeue(&dev->buffs[ct]))!=NULL)
286 if(skb->free)
287 kfree_skb(skb,FREE_WRITE);
288 ct++;
289 }
290 return(0);
291 }
292
293
294 /*
295 * Device change register/unregister. These are not inline or static
296 * as we export them to the world.
297 */
298
299 int register_netdevice_notifier(struct notifier_block *nb)
/* */
300 {
301 return notifier_chain_register(&netdev_chain, nb);
302 }
303
304 int unregister_netdevice_notifier(struct notifier_block *nb)
/* */
305 {
306 return notifier_chain_unregister(&netdev_chain,nb);
307 }
308
309
310
311 /*
312 * Send (or queue for sending) a packet.
313 *
314 * IMPORTANT: When this is called to resend frames. The caller MUST
315 * already have locked the sk_buff. Apart from that we do the
316 * rest of the magic.
317 */
318
319 void dev_queue_xmit(struct sk_buff *skb, struct device *dev, int pri)
/* */
320 {
321 unsigned long flags;
322 struct packet_type *ptype;
323 int where = 0; /* used to say if the packet should go */
324 /* at the front or the back of the */
325 /* queue - front is a retransmit try */
326
327 if(pri>=0 && !skb_device_locked(skb))
328 skb_device_lock(skb); /* Shove a lock on the frame */
329 #if CONFIG_SKB_CHECK
330 IS_SKB(skb);
331 #endif
332 skb->dev = dev;
333
334 /*
335 * Negative priority is used to flag a frame that is being pulled from the
336 * queue front as a retransmit attempt. It therefore goes back on the queue
337 * start on a failure.
338 */
339
340 if (pri < 0)
341 {
342 pri = -pri-1;
343 where = 1;
344 }
345
346 #ifdef CONFIG_NET_DEBUG
347 if (pri >= DEV_NUMBUFFS)
348 {
349 printk("bad priority in dev_queue_xmit.\n");
350 pri = 1;
351 }
352 #endif
353
354 /*
355 * If the address has not been resolved. Call the device header rebuilder.
356 * This can cover all protocols and technically not just ARP either.
357 */
358
359 if (!skb->arp && dev->rebuild_header(skb->data, dev, skb->raddr, skb)) {
360 return;
361 }
362
363 save_flags(flags);
364 cli();
365 if (/*dev_nit && */!where) /* Always keep order. It helps other hosts
366 far more than it costs us */
367 {
368 skb_queue_tail(dev->buffs + pri,skb);
369 skb_device_unlock(skb); /* Buffer is on the device queue and can be freed safely */
370 skb = skb_dequeue(dev->buffs + pri);
371 skb_device_lock(skb); /* New buffer needs locking down */
372 }
373 restore_flags(flags);
374
375 /* copy outgoing packets to any sniffer packet handlers */
376 if(!where && dev_nit)
377 {
378 skb->stamp=xtime;
379 for (ptype = ptype_all; ptype!=NULL; ptype = ptype->next)
380 {
381 /* Never send packets back to the socket
382 * they originated from - MvS (miquels@drinkel.ow.org)
383 */
384 if ((ptype->dev == dev || !ptype->dev) &&
385 ((struct sock *)ptype->data != skb->sk))
386 {
387 struct sk_buff *skb2;
388 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL)
389 break;
390 skb2->h.raw = skb2->data + dev->hard_header_len;
391 skb2->mac.raw = skb2->data;
392 ptype->func(skb2, skb->dev, ptype);
393 }
394 }
395 }
396 start_bh_atomic();
397 if (dev->hard_start_xmit(skb, dev) == 0) {
398 /*
399 * Packet is now solely the responsibility of the driver
400 */
401 end_bh_atomic();
402 return;
403 }
404 end_bh_atomic();
405
406 /*
407 * Transmission failed, put skb back into a list. Once on the list it's safe and
408 * no longer device locked (it can be freed safely from the device queue)
409 */
410 cli();
411 skb_device_unlock(skb);
412 skb_queue_head(dev->buffs + pri,skb);
413 restore_flags(flags);
414 }
415
416 /*
417 * Receive a packet from a device driver and queue it for the upper
418 * (protocol) levels. It always succeeds. This is the recommended
419 * interface to use.
420 */
421
422 void netif_rx(struct sk_buff *skb)
/* */
423 {
424 static int dropping = 0;
425
426 /*
427 * Any received buffers are un-owned and should be discarded
428 * when freed. These will be updated later as the frames get
429 * owners.
430 */
431 skb->sk = NULL;
432 skb->free = 1;
433 if(skb->stamp.tv_sec==0)
434 skb->stamp = xtime;
435
436 /*
437 * Check that we aren't overdoing things.
438 */
439
440 if (!backlog_size)
441 dropping = 0;
442 else if (backlog_size > 300)
443 dropping = 1;
444
445 if (dropping)
446 {
447 kfree_skb(skb, FREE_READ);
448 return;
449 }
450
451 /*
452 * Add it to the "backlog" queue.
453 */
454 #if CONFIG_SKB_CHECK
455 IS_SKB(skb);
456 #endif
457 skb_queue_tail(&backlog,skb);
458 backlog_size++;
459
460 /*
461 * If any packet arrived, mark it for processing after the
462 * hardware interrupt returns.
463 */
464
465 #ifdef CONFIG_NET_RUNONIRQ /* Dont enable yet, needs some driver mods */
466 net_bh();
467 #else
468 mark_bh(NET_BH);
469 #endif
470 return;
471 }
472
473
474 /*
475 * The old interface to fetch a packet from a device driver.
476 * This function is the base level entry point for all drivers that
477 * want to send a packet to the upper (protocol) levels. It takes
478 * care of de-multiplexing the packet to the various modules based
479 * on their protocol ID.
480 *
481 * Return values: 1 <- exit I can't do any more
482 * 0 <- feed me more (i.e. "done", "OK").
483 *
484 * This function is OBSOLETE and should not be used by any new
485 * device.
486 */
487
488 int dev_rint(unsigned char *buff, long len, int flags, struct device *dev)
/* */
489 {
490 static int dropping = 0;
491 struct sk_buff *skb = NULL;
492 unsigned char *to;
493 int amount, left;
494 int len2;
495
496 if (dev == NULL || buff == NULL || len <= 0)
497 return(1);
498
499 if (flags & IN_SKBUFF)
500 {
501 skb = (struct sk_buff *) buff;
502 }
503 else
504 {
505 if (dropping)
506 {
507 if (skb_peek(&backlog) != NULL)
508 return(1);
509 printk("INET: dev_rint: no longer dropping packets.\n");
510 dropping = 0;
511 }
512
513 skb = alloc_skb(len, GFP_ATOMIC);
514 if (skb == NULL)
515 {
516 printk("dev_rint: packet dropped on %s (no memory) !\n",
517 dev->name);
518 dropping = 1;
519 return(1);
520 }
521
522 /*
523 * First we copy the packet into a buffer, and save it for later. We
524 * in effect handle the incoming data as if it were from a circular buffer
525 */
526
527 to = skb_put(skb,len);
528 left = len;
529
530 len2 = len;
531 while (len2 > 0)
532 {
533 amount = min(len2, (unsigned long) dev->rmem_end -
534 (unsigned long) buff);
535 memcpy(to, buff, amount);
536 len2 -= amount;
537 left -= amount;
538 buff += amount;
539 to += amount;
540 if ((unsigned long) buff == dev->rmem_end)
541 buff = (unsigned char *) dev->rmem_start;
542 }
543 }
544
545 /*
546 * Tag the frame and kick it to the proper receive routine
547 */
548
549 skb->dev = dev;
550 skb->free = 1;
551
552 netif_rx(skb);
553 /*
554 * OK, all done.
555 */
556 return(0);
557 }
558
559
560 /*
561 * This routine causes all interfaces to try to send some data.
562 */
563
564 void dev_transmit(void)
/* */
565 {
566 struct device *dev;
567
568 for (dev = dev_base; dev != NULL; dev = dev->next)
569 {
570 if (dev->flags != 0 && !dev->tbusy) {
571 /*
572 * Kick the device
573 */
574 dev_tint(dev);
575 }
576 }
577 }
578
579
580 /**********************************************************************************
581
582 Receive Queue Processor
583
584 ***********************************************************************************/
585
586 /*
587 * This is a single non-reentrant routine which takes the received packet
588 * queue and throws it at the networking layers in the hope that something
589 * useful will emerge.
590 */
591
592 volatile char in_bh = 0; /* Non-reentrant remember */
593
594 int in_net_bh() /* Used by timer.c */
/* */
595 {
596 return(in_bh==0?0:1);
597 }
598
599 /*
600 * When we are called the queue is ready to grab, the interrupts are
601 * on and hardware can interrupt and queue to the receive queue a we
602 * run with no problems.
603 * This is run as a bottom half after an interrupt handler that does
604 * mark_bh(NET_BH);
605 */
606
607 void net_bh(void *tmp)
/* */
608 {
609 struct sk_buff *skb;
610 struct packet_type *ptype;
611 struct packet_type *pt_prev;
612 unsigned short type;
613
614 /*
615 * Atomically check and mark our BUSY state.
616 */
617
618 if (set_bit(1, (void*)&in_bh))
619 return;
620
621 /*
622 * Can we send anything now? We want to clear the
623 * decks for any more sends that get done as we
624 * process the input. This also minimises the
625 * latency on a transmit interrupt bh.
626 */
627
628 dev_transmit();
629
630 /*
631 * Any data left to process. This may occur because a
632 * mark_bh() is done after we empty the queue including
633 * that from the device which does a mark_bh() just after
634 */
635
636 cli();
637
638 /*
639 * While the queue is not empty
640 */
641
642 while((skb=skb_dequeue(&backlog))!=NULL)
643 {
644 /*
645 * We have a packet. Therefore the queue has shrunk
646 */
647 backlog_size--;
648
649 sti();
650
651 /*
652 * Bump the pointer to the next structure.
653 *
654 * On entry to the protocol layer. skb->data and
655 * skb->h.raw point to the MAC and encapsulated data
656 */
657
658 skb->h.raw = skb->data;
659
660 /*
661 * Fetch the packet protocol ID.
662 */
663
664 type = skb->protocol;
665
666 /*
667 * We got a packet ID. Now loop over the "known protocols"
668 * list. There are two lists. The ptype_all list of taps (normally empty)
669 * and the main protocol list which is hashed perfectly for normal protocols.
670 */
671 pt_prev = NULL;
672 for (ptype = ptype_all; ptype!=NULL; ptype=ptype->next)
673 {
674 if(pt_prev)
675 {
676 struct sk_buff *skb2=skb_clone(skb, GFP_ATOMIC);
677 if(skb2)
678 pt_prev->func(skb2,skb->dev, pt_prev);
679 }
680 pt_prev=ptype;
681 }
682
683 for (ptype = ptype_base[ntohs(type)&15]; ptype != NULL; ptype = ptype->next)
684 {
685 if (ptype->type == type && (!ptype->dev || ptype->dev==skb->dev))
686 {
687 /*
688 * We already have a match queued. Deliver
689 * to it and then remember the new match
690 */
691 if(pt_prev)
692 {
693 struct sk_buff *skb2;
694
695 skb2=skb_clone(skb, GFP_ATOMIC);
696
697 /*
698 * Kick the protocol handler. This should be fast
699 * and efficient code.
700 */
701
702 if(skb2)
703 pt_prev->func(skb2, skb->dev, pt_prev);
704 }
705 /* Remember the current last to do */
706 pt_prev=ptype;
707 }
708 } /* End of protocol list loop */
709
710 /*
711 * Is there a last item to send to ?
712 */
713
714 if(pt_prev)
715 pt_prev->func(skb, skb->dev, pt_prev);
716 /*
717 * Has an unknown packet has been received ?
718 */
719
720 else
721 kfree_skb(skb, FREE_WRITE);
722
723 /*
724 * Again, see if we can transmit anything now.
725 * [Ought to take this out judging by tests it slows
726 * us down not speeds us up]
727 */
728 #ifdef CONFIG_XMIT_EVERY
729 dev_transmit();
730 #endif
731 cli();
732 } /* End of queue loop */
733
734 /*
735 * We have emptied the queue
736 */
737
738 in_bh = 0;
739 sti();
740
741 /*
742 * One last output flush.
743 */
744
745 dev_transmit();
746 }
747
748
749 /*
750 * This routine is called when an device driver (i.e. an
751 * interface) is ready to transmit a packet.
752 */
753
754 void dev_tint(struct device *dev)
/* */
755 {
756 int i;
757 struct sk_buff *skb;
758 unsigned long flags;
759
760 save_flags(flags);
761 /*
762 * Work the queues in priority order
763 */
764
765 for(i = 0;i < DEV_NUMBUFFS; i++)
766 {
767 /*
768 * Pull packets from the queue
769 */
770
771
772 cli();
773 while((skb=skb_dequeue(&dev->buffs[i]))!=NULL)
774 {
775 /*
776 * Stop anyone freeing the buffer while we retransmit it
777 */
778 skb_device_lock(skb);
779 restore_flags(flags);
780 /*
781 * Feed them to the output stage and if it fails
782 * indicate they re-queue at the front.
783 */
784 dev_queue_xmit(skb,dev,-i - 1);
785 /*
786 * If we can take no more then stop here.
787 */
788 if (dev->tbusy)
789 return;
790 cli();
791 }
792 }
793 restore_flags(flags);
794 }
795
796
797 /*
798 * Perform a SIOCGIFCONF call. This structure will change
799 * size shortly, and there is nothing I can do about it.
800 * Thus we will need a 'compatibility mode'.
801 */
802
803 static int dev_ifconf(char *arg)
/* */
804 {
805 struct ifconf ifc;
806 struct ifreq ifr;
807 struct device *dev;
808 char *pos;
809 int len;
810 int err;
811
812 /*
813 * Fetch the caller's info block.
814 */
815
816 err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifconf));
817 if(err)
818 return err;
819 memcpy_fromfs(&ifc, arg, sizeof(struct ifconf));
820 len = ifc.ifc_len;
821 pos = ifc.ifc_buf;
822
823 /*
824 * We now walk the device list filling each active device
825 * into the array.
826 */
827
828 err=verify_area(VERIFY_WRITE,pos,len);
829 if(err)
830 return err;
831
832 /*
833 * Loop over the interfaces, and write an info block for each.
834 */
835
836 for (dev = dev_base; dev != NULL; dev = dev->next)
837 {
838 if(!(dev->flags & IFF_UP)) /* Downed devices don't count */
839 continue;
840 memset(&ifr, 0, sizeof(struct ifreq));
841 strcpy(ifr.ifr_name, dev->name);
842 (*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = dev->family;
843 (*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
844
845 /*
846 * Have we run out of space here ?
847 */
848
849 if (len < sizeof(struct ifreq))
850 break;
851
852 /*
853 * Write this block to the caller's space.
854 */
855
856 memcpy_tofs(pos, &ifr, sizeof(struct ifreq));
857 pos += sizeof(struct ifreq);
858 len -= sizeof(struct ifreq);
859 }
860
861 /*
862 * All done. Write the updated control block back to the caller.
863 */
864
865 ifc.ifc_len = (pos - ifc.ifc_buf);
866 ifc.ifc_req = (struct ifreq *) ifc.ifc_buf;
867 memcpy_tofs(arg, &ifc, sizeof(struct ifconf));
868
869 /*
870 * Report how much was filled in
871 */
872
873 return(pos - arg);
874 }
875
876
877 /*
878 * This is invoked by the /proc filesystem handler to display a device
879 * in detail.
880 */
881
882 static int sprintf_stats(char *buffer, struct device *dev)
/* */
883 {
884 struct enet_statistics *stats = (dev->get_stats ? dev->get_stats(dev): NULL);
885 int size;
886
887 if (stats)
888 size = sprintf(buffer, "%6s:%7d %4d %4d %4d %4d %8d %4d %4d %4d %5d %4d\n",
889 dev->name,
890 stats->rx_packets, stats->rx_errors,
891 stats->rx_dropped + stats->rx_missed_errors,
892 stats->rx_fifo_errors,
893 stats->rx_length_errors + stats->rx_over_errors
894 + stats->rx_crc_errors + stats->rx_frame_errors,
895 stats->tx_packets, stats->tx_errors, stats->tx_dropped,
896 stats->tx_fifo_errors, stats->collisions,
897 stats->tx_carrier_errors + stats->tx_aborted_errors
898 + stats->tx_window_errors + stats->tx_heartbeat_errors);
899 else
900 size = sprintf(buffer, "%6s: No statistics available.\n", dev->name);
901
902 return size;
903 }
904
905 /*
906 * Called from the PROCfs module. This now uses the new arbitrary sized /proc/net interface
907 * to create /proc/net/dev
908 */
909
910 int dev_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
/* */
911 {
912 int len=0;
913 off_t begin=0;
914 off_t pos=0;
915 int size;
916
917 struct device *dev;
918
919
920 size = sprintf(buffer, "Inter-| Receive | Transmit\n"
921 " face |packets errs drop fifo frame|packets errs drop fifo colls carrier\n");
922
923 pos+=size;
924 len+=size;
925
926
927 for (dev = dev_base; dev != NULL; dev = dev->next)
928 {
929 size = sprintf_stats(buffer+len, dev);
930 len+=size;
931 pos=begin+len;
932
933 if(pos<offset)
934 {
935 len=0;
936 begin=pos;
937 }
938 if(pos>offset+length)
939 break;
940 }
941
942 *start=buffer+(offset-begin); /* Start of wanted data */
943 len-=(offset-begin); /* Start slop */
944 if(len>length)
945 len=length; /* Ending slop */
946 return len;
947 }
948
949
950 /*
951 * This checks bitmasks for the ioctl calls for devices.
952 */
953
954 static inline int bad_mask(unsigned long mask, unsigned long addr)
/* */
955 {
956 if (addr & (mask = ~mask))
957 return 1;
958 mask = ntohl(mask);
959 if (mask & (mask+1))
960 return 1;
961 return 0;
962 }
963
964 /*
965 * Perform the SIOCxIFxxx calls.
966 *
967 * The socket layer has seen an ioctl the address family thinks is
968 * for the device. At this point we get invoked to make a decision
969 */
970
971 static int dev_ifsioc(void *arg, unsigned int getset)
/* */
972 {
973 struct ifreq ifr;
974 struct device *dev;
975 int ret;
976
977 /*
978 * Fetch the caller's info block into kernel space
979 */
980
981 int err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifreq));
982 if(err)
983 return err;
984
985 memcpy_fromfs(&ifr, arg, sizeof(struct ifreq));
986
987 /*
988 * See which interface the caller is talking about.
989 */
990
991 if ((dev = dev_get(ifr.ifr_name)) == NULL)
992 return(-ENODEV);
993
994 switch(getset)
995 {
996 case SIOCGIFFLAGS: /* Get interface flags */
997 ifr.ifr_flags = dev->flags;
998 goto rarok;
999
1000 case SIOCSIFFLAGS: /* Set interface flags */
1001 {
1002 int old_flags = dev->flags;
1003
1004 /*
1005 * We are not allowed to potentially close/unload
1006 * a device until we get this lock.
1007 */
1008
1009 dev_lock_wait();
1010
1011 dev->flags = ifr.ifr_flags & (
1012 IFF_UP | IFF_BROADCAST | IFF_DEBUG | IFF_LOOPBACK |
1013 IFF_POINTOPOINT | IFF_NOTRAILERS | IFF_RUNNING |
1014 IFF_NOARP | IFF_PROMISC | IFF_ALLMULTI | IFF_SLAVE | IFF_MASTER
1015 | IFF_MULTICAST);
1016 /*
1017 * Load in the correct multicast list now the flags have changed.
1018 */
1019
1020 dev_mc_upload(dev);
1021
1022 /*
1023 * Have we downed the interface
1024 */
1025
1026 if ((old_flags & IFF_UP) && ((dev->flags & IFF_UP) == 0))
1027 {
1028 /*
1029 * Restore IFF_UP so dev_close knows to shut
1030 * it down. FIXME: Tidy me up sometime.
1031 */
1032 dev->flags|=IFF_UP;
1033 ret = dev_close(dev);
1034 }
1035 else
1036 {
1037 /*
1038 * Have we upped the interface
1039 */
1040
1041 ret = (! (old_flags & IFF_UP) && (dev->flags & IFF_UP))
1042 ? dev_open(dev) : 0;
1043 /*
1044 * Check the flags.
1045 */
1046 if(ret<0)
1047 dev->flags&=~IFF_UP; /* Didn't open so down the if */
1048 }
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)
/* */
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
1312 void dev_init(void)
/* ![[last]](../icons/n_last.png)
*/
1313 {
1314 struct device *dev, **dp;
1315
1316 /*
1317 * Add the devices.
1318 * If the call to dev->init fails, the dev is removed
1319 * from the chain disconnecting the device until the
1320 * next reboot.
1321 */
1322
1323 dp = &dev_base;
1324 while ((dev = *dp) != NULL)
1325 {
1326 int i;
1327 for (i = 0; i < DEV_NUMBUFFS; i++) {
1328 skb_queue_head_init(dev->buffs + i);
1329 }
1330
1331 if (dev->init && dev->init(dev))
1332 {
1333 /*
1334 * It failed to come up. Unhook it.
1335 */
1336 *dp = dev->next;
1337 }
1338 else
1339 {
1340 dp = &dev->next;
1341 }
1342 }
1343 proc_net_register(&(struct proc_dir_entry) {
1344 PROC_NET_DEV, 3, "dev",
1345 S_IFREG | S_IRUGO, 1, 0, 0,
1346 0, &proc_net_inode_operations,
1347 dev_get_info
1348 });
1349 }
1350
![[bottom]](../icons/n_bottom.png){kind=icon}
*/