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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 *
26 * Cleaned up and recommented by Alan Cox 2nd April 1994. I hope to have
27 * the rest as well commented in the end.
28 */
29
30 /*
31 * A lot of these includes will be going walkies very soon
32 */
33
34 #include <asm/segment.h>
35 #include <asm/system.h>
36 #include <asm/bitops.h>
37 #include <linux/config.h>
38 #include <linux/types.h>
39 #include <linux/kernel.h>
40 #include <linux/sched.h>
41 #include <linux/string.h>
42 #include <linux/mm.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/in.h>
46 #include <linux/errno.h>
47 #include <linux/interrupt.h>
48 #include <linux/if_ether.h>
49 #include <linux/inet.h>
50 #include <linux/netdevice.h>
51 #include <linux/etherdevice.h>
52 #include "ip.h"
53 #include "route.h"
54 #include <linux/skbuff.h>
55 #include "sock.h"
56 #include "arp.h"
57
58
59 /*
60 * The list of packet types we will receive (as opposed to discard)
61 * and the routines to invoke.
62 */
63
64 struct packet_type *ptype_base = NULL;
65
66 /*
67 * Device drivers call our routines to queue packets here. We empty the
68 * queue in the bottom half handler.
69 */
70
71 static struct sk_buff_head backlog =
72 {
73 (struct sk_buff *)&backlog, (struct sk_buff *)&backlog
74 #ifdef CONFIG_SKB_CHECK
75 ,SK_HEAD_SKB
76 #endif
77 };
78
79 /*
80 * We don't overdo the queue or we will thrash memory badly.
81 */
82
83 static int backlog_size = 0;
84
85 /*
86 * The number of sockets open for 'all' protocol use. We have to
87 * know this to copy a buffer the correct number of times.
88 */
89
90 static int dev_nit=0;
91
92 /*
93 * Return the lesser of the two values.
94 */
95
96 static __inline__ unsigned long min(unsigned long a, unsigned long b)
/* ![[next]](../icons/right.png)
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*/
97 {
98 return (a < b)? a : b;
99 }
100
101
102 /******************************************************************************************
103
104 Protocol management and registration routines
105
106 *******************************************************************************************/
107
108
109 /*
110 * Add a protocol ID to the list.
111 */
112
113 void dev_add_pack(struct packet_type *pt)
/* ![[previous]](../icons/left.png)
*/
114 {
115 struct packet_type *p1;
116 pt->next = ptype_base;
117
118 /*
119 * Don't use copy counts on ETH_P_ALL. Instead keep a global
120 * count of number of these and use it and pt->copy to decide
121 * copies
122 */
123
124 pt->copy=0; /* Assume we will not be copying the buffer before
125 * this routine gets it
126 */
127
128 if(pt->type == htons(ETH_P_ALL))
129 dev_nit++; /* I'd like a /dev/nit too one day 8) */
130 else
131 {
132 /*
133 * See if we need to copy it - that is another process also
134 * wishes to receive this type of packet.
135 */
136 for (p1 = ptype_base; p1 != NULL; p1 = p1->next)
137 {
138 if (p1->type == pt->type)
139 {
140 pt->copy = 1; /* We will need to copy */
141 break;
142 }
143 }
144 }
145
146 /*
147 * NIT taps must go at the end or net_bh will leak!
148 */
149
150 if (pt->type == htons(ETH_P_ALL))
151 {
152 pt->next=NULL;
153 if(ptype_base==NULL)
154 ptype_base=pt;
155 else
156 {
157 /*
158 * Move to the end of the list
159 */
160 for(p1=ptype_base;p1->next!=NULL;p1=p1->next);
161 /*
162 * Hook on the end
163 */
164 p1->next=pt;
165 }
166 }
167 else
168 /*
169 * It goes on the start
170 */
171 ptype_base = pt;
172 }
173
174
175 /*
176 * Remove a protocol ID from the list.
177 */
178
179 void dev_remove_pack(struct packet_type *pt)
/* */
180 {
181 struct packet_type *lpt, *pt1;
182
183 /*
184 * Keep the count of nit (Network Interface Tap) sockets correct.
185 */
186
187 if (pt->type == htons(ETH_P_ALL))
188 dev_nit--;
189
190 /*
191 * If we are first, just unhook us.
192 */
193
194 if (pt == ptype_base)
195 {
196 ptype_base = pt->next;
197 return;
198 }
199
200 lpt = NULL;
201
202 /*
203 * This is harder. What we do is to walk the list of sockets
204 * for this type. We unhook the entry, and if there is a previous
205 * entry that is copying _and_ we are not copying, (ie we are the
206 * last entry for this type) then the previous one is set to
207 * non-copying as it is now the last.
208 */
209 for (pt1 = ptype_base; pt1->next != NULL; pt1 = pt1->next)
210 {
211 if (pt1->next == pt )
212 {
213 cli();
214 if (!pt->copy && lpt)
215 lpt->copy = 0;
216 pt1->next = pt->next;
217 sti();
218 return;
219 }
220 if (pt1->next->type == pt->type && pt->type != htons(ETH_P_ALL))
221 lpt = pt1->next;
222 }
223 }
224
225 /*****************************************************************************************
226
227 Device Interface Subroutines
228
229 ******************************************************************************************/
230
231 /*
232 * Find an interface by name.
233 */
234
235 struct device *dev_get(char *name)
/* */
236 {
237 struct device *dev;
238
239 for (dev = dev_base; dev != NULL; dev = dev->next)
240 {
241 if (strcmp(dev->name, name) == 0)
242 return(dev);
243 }
244 return(NULL);
245 }
246
247
248 /*
249 * Prepare an interface for use.
250 */
251
252 int dev_open(struct device *dev)
/* */
253 {
254 int ret = 0;
255
256 /*
257 * Call device private open method
258 */
259 if (dev->open)
260 ret = dev->open(dev);
261
262 /*
263 * If it went open OK then set the flags
264 */
265
266 if (ret == 0)
267 dev->flags |= (IFF_UP | IFF_RUNNING);
268
269 return(ret);
270 }
271
272
273 /*
274 * Completely shutdown an interface.
275 *
276 * WARNING: Both because of the way the upper layers work (that can be fixed)
277 * and because of races during a close (that can't be fixed any other way)
278 * a device may be given things to transmit EVEN WHEN IT IS DOWN. The driver
279 * MUST cope with this (eg by freeing and dumping the frame).
280 */
281
282 int dev_close(struct device *dev)
/* */
283 {
284 /*
285 * Only close a device if it is up.
286 */
287
288 if (dev->flags != 0)
289 {
290 int ct=0;
291 dev->flags = 0;
292 /*
293 * Call the device specific close. This cannot fail.
294 */
295 if (dev->stop)
296 dev->stop(dev);
297 /*
298 * Delete the route to the device.
299 */
300 #ifdef CONFIG_INET
301 ip_rt_flush(dev);
302 arp_device_down(dev);
303 #endif
304 #ifdef CONFIG_IPX
305 ipxrtr_device_down(dev);
306 #endif
307 /*
308 * Blank the IP addresses
309 */
310 dev->pa_addr = 0;
311 dev->pa_dstaddr = 0;
312 dev->pa_brdaddr = 0;
313 dev->pa_mask = 0;
314 /*
315 * Purge any queued packets when we down the link
316 */
317 while(ct<DEV_NUMBUFFS)
318 {
319 struct sk_buff *skb;
320 while((skb=skb_dequeue(&dev->buffs[ct]))!=NULL)
321 if(skb->free)
322 kfree_skb(skb,FREE_WRITE);
323 ct++;
324 }
325 }
326 return(0);
327 }
328
329
330 /*
331 * Send (or queue for sending) a packet.
332 *
333 * IMPORTANT: When this is called to resend frames. The caller MUST
334 * already have locked the sk_buff. Apart from that we do the
335 * rest of the magic.
336 */
337
338 void dev_queue_xmit(struct sk_buff *skb, struct device *dev, int pri)
/* */
339 {
340 unsigned long flags;
341 int nitcount;
342 struct packet_type *ptype;
343 int where = 0; /* used to say if the packet should go */
344 /* at the front or the back of the */
345 /* queue - front is a retransmit try */
346
347 if (dev == NULL)
348 {
349 printk("dev.c: dev_queue_xmit: dev = NULL\n");
350 return;
351 }
352
353 if(pri>=0 && !skb_device_locked(skb))
354 skb_device_lock(skb); /* Shove a lock on the frame */
355 #ifdef CONFIG_SLAVE_BALANCING
356 save_flags(flags);
357 cli();
358 if(dev->slave!=NULL && dev->slave->pkt_queue < dev->pkt_queue &&
359 (dev->slave->flags & IFF_UP))
360 dev=dev->slave;
361 restore_flags(flags);
362 #endif
363
364 IS_SKB(skb);
365
366 skb->dev = dev;
367
368 /*
369 * This just eliminates some race conditions, but not all...
370 */
371
372 if (skb->next != NULL)
373 {
374 /*
375 * Make sure we haven't missed an interrupt.
376 */
377 printk("dev_queue_xmit: worked around a missed interrupt\n");
378 dev->hard_start_xmit(NULL, dev);
379 return;
380 }
381
382 /*
383 * Negative priority is used to flag a frame that is being pulled from the
384 * queue front as a retransmit attempt. It therefore goes back on the queue
385 * start on a failure.
386 */
387
388 if (pri < 0)
389 {
390 pri = -pri-1;
391 where = 1;
392 }
393
394 if (pri >= DEV_NUMBUFFS)
395 {
396 printk("bad priority in dev_queue_xmit.\n");
397 pri = 1;
398 }
399
400 /*
401 * If the address has not been resolved. Call the device header rebuilder.
402 * This can cover all protocols and technically not just ARP either.
403 */
404
405 if (!skb->arp && dev->rebuild_header(skb->data, dev, skb->raddr, skb)) {
406 return;
407 }
408
409 save_flags(flags);
410 cli();
411 if (!where) {
412 #ifdef CONFIG_SLAVE_BALANCING
413 skb->in_dev_queue=1;
414 #endif
415 skb_queue_tail(dev->buffs + pri,skb);
416 skb_device_unlock(skb); /* Buffer is on the device queue and can be freed safely */
417 skb = skb_dequeue(dev->buffs + pri);
418 skb_device_lock(skb); /* New buffer needs locking down */
419 #ifdef CONFIG_SLAVE_BALANCING
420 skb->in_dev_queue=0;
421 #endif
422 }
423 restore_flags(flags);
424
425 /* copy outgoing packets to any sniffer packet handlers */
426 if(!where)
427 {
428 for (nitcount = dev_nit, ptype = ptype_base; nitcount > 0 && ptype != NULL; ptype = ptype->next)
429 {
430 if (ptype->type == htons(ETH_P_ALL)) {
431 struct sk_buff *skb2;
432 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL)
433 break;
434 ptype->func(skb2, skb->dev, ptype);
435 nitcount--;
436 }
437 }
438 }
439 if (dev->hard_start_xmit(skb, dev) == 0) {
440 /*
441 * Packet is now solely the responsibility of the driver
442 */
443 return;
444 }
445
446 /*
447 * Transmission failed, put skb back into a list. Once on the list its safe and
448 * no longer device locked (it can be freed safely from the device queue)
449 */
450 cli();
451 #ifdef CONFIG_SLAVE_BALANCING
452 skb->in_dev_queue=1;
453 dev->pkt_queue++;
454 #endif
455 skb_device_unlock(skb);
456 skb_queue_head(dev->buffs + pri,skb);
457 restore_flags(flags);
458 }
459
460 /*
461 * Receive a packet from a device driver and queue it for the upper
462 * (protocol) levels. It always succeeds. This is the recommended
463 * interface to use.
464 */
465
466 void netif_rx(struct sk_buff *skb)
/* */
467 {
468 static int dropping = 0;
469
470 /*
471 * Any received buffers are un-owned and should be discarded
472 * when freed. These will be updated later as the frames get
473 * owners.
474 */
475 skb->sk = NULL;
476 skb->free = 1;
477 if(skb->stamp.tv_sec==0)
478 skb->stamp = xtime;
479
480 /*
481 * Check that we aren't overdoing things.
482 */
483
484 if (!backlog_size)
485 dropping = 0;
486 else if (backlog_size > 100)
487 dropping = 1;
488
489 if (dropping)
490 {
491 kfree_skb(skb, FREE_READ);
492 return;
493 }
494
495 /*
496 * Add it to the "backlog" queue.
497 */
498
499 IS_SKB(skb);
500 skb_queue_tail(&backlog,skb);
501 backlog_size++;
502
503 /*
504 * If any packet arrived, mark it for processing after the
505 * hardware interrupt returns.
506 */
507
508 mark_bh(NET_BH);
509 return;
510 }
511
512
513 /*
514 * The old interface to fetch a packet from a device driver.
515 * This function is the base level entry point for all drivers that
516 * want to send a packet to the upper (protocol) levels. It takes
517 * care of de-multiplexing the packet to the various modules based
518 * on their protocol ID.
519 *
520 * Return values: 1 <- exit I can't do any more
521 * 0 <- feed me more (i.e. "done", "OK").
522 *
523 * This function is OBSOLETE and should not be used by any new
524 * device.
525 */
526
527 int dev_rint(unsigned char *buff, long len, int flags, struct device *dev)
/* */
528 {
529 static int dropping = 0;
530 struct sk_buff *skb = NULL;
531 unsigned char *to;
532 int amount, left;
533 int len2;
534
535 if (dev == NULL || buff == NULL || len <= 0)
536 return(1);
537
538 if (flags & IN_SKBUFF)
539 {
540 skb = (struct sk_buff *) buff;
541 }
542 else
543 {
544 if (dropping)
545 {
546 if (skb_peek(&backlog) != NULL)
547 return(1);
548 printk("INET: dev_rint: no longer dropping packets.\n");
549 dropping = 0;
550 }
551
552 skb = alloc_skb(len, GFP_ATOMIC);
553 if (skb == NULL)
554 {
555 printk("dev_rint: packet dropped on %s (no memory) !\n",
556 dev->name);
557 dropping = 1;
558 return(1);
559 }
560
561 /*
562 * First we copy the packet into a buffer, and save it for later. We
563 * in effect handle the incoming data as if it were from a circular buffer
564 */
565
566 to = skb->data;
567 left = len;
568
569 len2 = len;
570 while (len2 > 0)
571 {
572 amount = min(len2, (unsigned long) dev->rmem_end -
573 (unsigned long) buff);
574 memcpy(to, buff, amount);
575 len2 -= amount;
576 left -= amount;
577 buff += amount;
578 to += amount;
579 if ((unsigned long) buff == dev->rmem_end)
580 buff = (unsigned char *) dev->rmem_start;
581 }
582 }
583
584 /*
585 * Tag the frame and kick it to the proper receive routine
586 */
587
588 skb->len = len;
589 skb->dev = dev;
590 skb->free = 1;
591
592 netif_rx(skb);
593 /*
594 * OK, all done.
595 */
596 return(0);
597 }
598
599
600 /*
601 * This routine causes all interfaces to try to send some data.
602 */
603
604 void dev_transmit(void)
/* */
605 {
606 struct device *dev;
607
608 for (dev = dev_base; dev != NULL; dev = dev->next)
609 {
610 if (dev->flags != 0 && !dev->tbusy) {
611 /*
612 * Kick the device
613 */
614 dev_tint(dev);
615 }
616 }
617 }
618
619
620 /**********************************************************************************
621
622 Receive Queue Processor
623
624 ***********************************************************************************/
625
626 /*
627 * This is a single non-reentrant routine which takes the received packet
628 * queue and throws it at the networking layers in the hope that something
629 * useful will emerge.
630 */
631
632 volatile char in_bh = 0; /* Non-reentrant remember */
633
634 int in_net_bh() /* Used by timer.c */
/* */
635 {
636 return(in_bh==0?0:1);
637 }
638
639 /*
640 * When we are called the queue is ready to grab, the interrupts are
641 * on and hardware can interrupt and queue to the receive queue a we
642 * run with no problems.
643 * This is run as a bottom half after an interrupt handler that does
644 * mark_bh(NET_BH);
645 */
646
647 void net_bh(void *tmp)
/* */
648 {
649 struct sk_buff *skb;
650 struct packet_type *ptype;
651 unsigned short type;
652 unsigned char flag = 0;
653 int nitcount;
654
655 /*
656 * Atomically check and mark our BUSY state.
657 */
658
659 if (set_bit(1, (void*)&in_bh))
660 return;
661
662 /*
663 * Can we send anything now? We want to clear the
664 * decks for any more sends that get done as we
665 * process the input.
666 */
667
668 dev_transmit();
669
670 /*
671 * Any data left to process. This may occur because a
672 * mark_bh() is done after we empty the queue including
673 * that from the device which does a mark_bh() just after
674 */
675
676 cli();
677
678 /*
679 * While the queue is not empty
680 */
681
682 while((skb=skb_dequeue(&backlog))!=NULL)
683 {
684 /*
685 * We have a packet. Therefore the queue has shrunk
686 */
687 backlog_size--;
688
689 nitcount=dev_nit;
690 flag=0;
691 sti();
692
693 /*
694 * Bump the pointer to the next structure.
695 * This assumes that the basic 'skb' pointer points to
696 * the MAC header, if any (as indicated by its "length"
697 * field). Take care now!
698 */
699
700 skb->h.raw = skb->data + skb->dev->hard_header_len;
701 skb->len -= skb->dev->hard_header_len;
702
703 /*
704 * Fetch the packet protocol ID. This is also quite ugly, as
705 * it depends on the protocol driver (the interface itself) to
706 * know what the type is, or where to get it from. The Ethernet
707 * interfaces fetch the ID from the two bytes in the Ethernet MAC
708 * header (the h_proto field in struct ethhdr), but other drivers
709 * may either use the ethernet ID's or extra ones that do not
710 * clash (eg ETH_P_AX25). We could set this before we queue the
711 * frame. In fact I may change this when I have time.
712 */
713
714 type = skb->dev->type_trans(skb, skb->dev);
715
716 /*
717 * We got a packet ID. Now loop over the "known protocols"
718 * table (which is actually a linked list, but this will
719 * change soon if I get my way- FvK), and forward the packet
720 * to anyone who wants it.
721 *
722 * [FvK didn't get his way but he is right this ought to be
723 * hashed so we typically get a single hit. The speed cost
724 * here is minimal but no doubt adds up at the 4,000+ pkts/second
725 * rate we can hit flat out]
726 */
727
728 for (ptype = ptype_base; ptype != NULL; ptype = ptype->next)
729 {
730 if (ptype->type == type || ptype->type == htons(ETH_P_ALL))
731 {
732 struct sk_buff *skb2;
733
734 if (ptype->type == htons(ETH_P_ALL))
735 nitcount--;
736 if (ptype->copy || nitcount)
737 {
738 /*
739 * copy if we need to
740 */
741 #ifdef OLD
742 skb2 = alloc_skb(skb->len, GFP_ATOMIC);
743 if (skb2 == NULL)
744 continue;
745 memcpy(skb2, skb, skb2->mem_len);
746 skb2->mem_addr = skb2;
747 skb2->h.raw = (unsigned char *)(
748 (unsigned long) skb2 +
749 (unsigned long) skb->h.raw -
750 (unsigned long) skb
751 );
752 skb2->free = 1;
753 #else
754 skb2=skb_clone(skb, GFP_ATOMIC);
755 if(skb2==NULL)
756 continue;
757 #endif
758 }
759 else
760 {
761 skb2 = skb;
762 }
763
764 /*
765 * Protocol located.
766 */
767
768 flag = 1;
769
770 /*
771 * Kick the protocol handler. This should be fast
772 * and efficient code.
773 */
774
775 ptype->func(skb2, skb->dev, ptype);
776 }
777 } /* End of protocol list loop */
778
779 /*
780 * Has an unknown packet has been received ?
781 */
782
783 if (!flag)
784 {
785 kfree_skb(skb, FREE_WRITE);
786 }
787
788 /*
789 * Again, see if we can transmit anything now.
790 */
791
792 dev_transmit();
793 cli();
794 } /* End of queue loop */
795
796 /*
797 * We have emptied the queue
798 */
799
800 in_bh = 0;
801 sti();
802
803 /*
804 * One last output flush.
805 */
806
807 dev_transmit();
808 }
809
810
811 /*
812 * This routine is called when an device driver (i.e. an
813 * interface) is ready to transmit a packet.
814 */
815
816 void dev_tint(struct device *dev)
/* */
817 {
818 int i;
819 struct sk_buff *skb;
820 unsigned long flags;
821
822 save_flags(flags);
823 /*
824 * Work the queues in priority order
825 */
826
827 for(i = 0;i < DEV_NUMBUFFS; i++)
828 {
829 /*
830 * Pull packets from the queue
831 */
832
833
834 cli();
835 while((skb=skb_dequeue(&dev->buffs[i]))!=NULL)
836 {
837 /*
838 * Stop anyone freeing the buffer while we retransmit it
839 */
840 skb_device_lock(skb);
841 restore_flags(flags);
842 /*
843 * Feed them to the output stage and if it fails
844 * indicate they re-queue at the front.
845 */
846 dev_queue_xmit(skb,dev,-i - 1);
847 /*
848 * If we can take no more then stop here.
849 */
850 if (dev->tbusy)
851 return;
852 cli();
853 }
854 }
855 restore_flags(flags);
856 }
857
858
859 /*
860 * Perform a SIOCGIFCONF call. This structure will change
861 * size shortly, and there is nothing I can do about it.
862 * Thus we will need a 'compatibility mode'.
863 */
864
865 static int dev_ifconf(char *arg)
/* */
866 {
867 struct ifconf ifc;
868 struct ifreq ifr;
869 struct device *dev;
870 char *pos;
871 int len;
872 int err;
873
874 /*
875 * Fetch the caller's info block.
876 */
877
878 err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifconf));
879 if(err)
880 return err;
881 memcpy_fromfs(&ifc, arg, sizeof(struct ifconf));
882 len = ifc.ifc_len;
883 pos = ifc.ifc_buf;
884
885 /*
886 * We now walk the device list filling each active device
887 * into the array.
888 */
889
890 err=verify_area(VERIFY_WRITE,pos,len);
891 if(err)
892 return err;
893
894 /*
895 * Loop over the interfaces, and write an info block for each.
896 */
897
898 for (dev = dev_base; dev != NULL; dev = dev->next)
899 {
900 if(!(dev->flags & IFF_UP)) /* Downed devices don't count */
901 continue;
902 memset(&ifr, 0, sizeof(struct ifreq));
903 strcpy(ifr.ifr_name, dev->name);
904 (*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = dev->family;
905 (*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
906
907 /*
908 * Write this block to the caller's space.
909 */
910
911 memcpy_tofs(pos, &ifr, sizeof(struct ifreq));
912 pos += sizeof(struct ifreq);
913 len -= sizeof(struct ifreq);
914
915 /*
916 * Have we run out of space here ?
917 */
918
919 if (len < sizeof(struct ifreq))
920 break;
921 }
922
923 /*
924 * All done. Write the updated control block back to the caller.
925 */
926
927 ifc.ifc_len = (pos - ifc.ifc_buf);
928 ifc.ifc_req = (struct ifreq *) ifc.ifc_buf;
929 memcpy_tofs(arg, &ifc, sizeof(struct ifconf));
930
931 /*
932 * Report how much was filled in
933 */
934
935 return(pos - arg);
936 }
937
938
939 /*
940 * This is invoked by the /proc filesystem handler to display a device
941 * in detail.
942 */
943
944 static int sprintf_stats(char *buffer, struct device *dev)
/* */
945 {
946 struct enet_statistics *stats = (dev->get_stats ? dev->get_stats(dev): NULL);
947 int size;
948
949 if (stats)
950 size = sprintf(buffer, "%6s:%7d %4d %4d %4d %4d %8d %4d %4d %4d %5d %4d\n",
951 dev->name,
952 stats->rx_packets, stats->rx_errors,
953 stats->rx_dropped + stats->rx_missed_errors,
954 stats->rx_fifo_errors,
955 stats->rx_length_errors + stats->rx_over_errors
956 + stats->rx_crc_errors + stats->rx_frame_errors,
957 stats->tx_packets, stats->tx_errors, stats->tx_dropped,
958 stats->tx_fifo_errors, stats->collisions,
959 stats->tx_carrier_errors + stats->tx_aborted_errors
960 + stats->tx_window_errors + stats->tx_heartbeat_errors);
961 else
962 size = sprintf(buffer, "%6s: No statistics available.\n", dev->name);
963
964 return size;
965 }
966
967 /*
968 * Called from the PROCfs module. This now uses the new arbitrary sized /proc/net interface
969 * to create /proc/net/dev
970 */
971
972 int dev_get_info(char *buffer, char **start, off_t offset, int length)
/* */
973 {
974 int len=0;
975 off_t begin=0;
976 off_t pos=0;
977 int size;
978
979 struct device *dev;
980
981
982 size = sprintf(buffer, "Inter-| Receive | Transmit\n"
983 " face |packets errs drop fifo frame|packets errs drop fifo colls carrier\n");
984
985 pos+=size;
986 len+=size;
987
988
989 for (dev = dev_base; dev != NULL; dev = dev->next)
990 {
991 size = sprintf_stats(buffer+len, dev);
992 len+=size;
993 pos=begin+len;
994
995 if(pos<offset)
996 {
997 len=0;
998 begin=pos;
999 }
1000 if(pos>offset+length)
1001 break;
1002 }
1003
1004 *start=buffer+(offset-begin); /* Start of wanted data */
1005 len-=(offset-begin); /* Start slop */
1006 if(len>length)
1007 len=length; /* Ending slop */
1008 return len;
1009 }
1010
1011
1012 /*
1013 * This checks bitmasks for the ioctl calls for devices.
1014 */
1015
1016 static inline int bad_mask(unsigned long mask, unsigned long addr)
/* */
1017 {
1018 if (addr & (mask = ~mask))
1019 return 1;
1020 mask = ntohl(mask);
1021 if (mask & (mask+1))
1022 return 1;
1023 return 0;
1024 }
1025
1026 /*
1027 * Perform the SIOCxIFxxx calls.
1028 *
1029 * The socket layer has seen an ioctl the address family thinks is
1030 * for the device. At this point we get invoked to make a decision
1031 */
1032
1033 static int dev_ifsioc(void *arg, unsigned int getset)
/* */
1034 {
1035 struct ifreq ifr;
1036 struct device *dev;
1037 int ret;
1038
1039 /*
1040 * Fetch the caller's info block into kernel space
1041 */
1042
1043 int err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifreq));
1044 if(err)
1045 return err;
1046
1047 memcpy_fromfs(&ifr, arg, sizeof(struct ifreq));
1048
1049 /*
1050 * See which interface the caller is talking about.
1051 */
1052
1053 if ((dev = dev_get(ifr.ifr_name)) == NULL)
1054 return(-ENODEV);
1055
1056 switch(getset)
1057 {
1058 case SIOCGIFFLAGS: /* Get interface flags */
1059 ifr.ifr_flags = dev->flags;
1060 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1061 ret = 0;
1062 break;
1063 case SIOCSIFFLAGS: /* Set interface flags */
1064 {
1065 int old_flags = dev->flags;
1066 #ifdef CONFIG_SLAVE_BALANCING
1067 if(dev->flags&IFF_SLAVE)
1068 return -EBUSY;
1069 #endif
1070 dev->flags = ifr.ifr_flags & (
1071 IFF_UP | IFF_BROADCAST | IFF_DEBUG | IFF_LOOPBACK |
1072 IFF_POINTOPOINT | IFF_NOTRAILERS | IFF_RUNNING |
1073 IFF_NOARP | IFF_PROMISC | IFF_ALLMULTI | IFF_SLAVE | IFF_MASTER);
1074 #ifdef CONFIG_SLAVE_BALANCING
1075 if(!(dev->flags&IFF_MASTER) && dev->slave)
1076 {
1077 dev->slave->flags&=~IFF_SLAVE;
1078 dev->slave=NULL;
1079 }
1080 #endif
1081
1082 if( dev->set_multicast_list!=NULL)
1083 {
1084
1085 /*
1086 * Has promiscuous mode been turned off
1087 */
1088
1089 if ( (old_flags & IFF_PROMISC) && ((dev->flags & IFF_PROMISC) == 0))
1090 dev->set_multicast_list(dev,0,NULL);
1091
1092 /*
1093 * Has it been turned on
1094 */
1095
1096 if ( (dev->flags & IFF_PROMISC) && ((old_flags & IFF_PROMISC) == 0))
1097 dev->set_multicast_list(dev,-1,NULL);
1098 }
1099
1100 /*
1101 * Have we downed the interface
1102 */
1103
1104 if ((old_flags & IFF_UP) && ((dev->flags & IFF_UP) == 0))
1105 {
1106 ret = dev_close(dev);
1107 }
1108 else
1109 {
1110 /*
1111 * Have we upped the interface
1112 */
1113
1114 ret = (! (old_flags & IFF_UP) && (dev->flags & IFF_UP))
1115 ? dev_open(dev) : 0;
1116 /*
1117 * Check the flags.
1118 */
1119 if(ret<0)
1120 dev->flags&=~IFF_UP; /* Didn't open so down the if */
1121 }
1122 }
1123 break;
1124
1125 case SIOCGIFADDR: /* Get interface address (and family) */
1126 (*(struct sockaddr_in *)
1127 &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
1128 (*(struct sockaddr_in *)
1129 &ifr.ifr_addr).sin_family = dev->family;
1130 (*(struct sockaddr_in *)
1131 &ifr.ifr_addr).sin_port = 0;
1132 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1133 ret = 0;
1134 break;
1135
1136 case SIOCSIFADDR: /* Set interface address (and family) */
1137 dev->pa_addr = (*(struct sockaddr_in *)
1138 &ifr.ifr_addr).sin_addr.s_addr;
1139 dev->family = ifr.ifr_addr.sa_family;
1140
1141 #ifdef CONFIG_INET
1142 /* This is naughty. When net-032e comes out It wants moving into the net032
1143 code not the kernel. Till then it can sit here (SIGH) */
1144 dev->pa_mask = ip_get_mask(dev->pa_addr);
1145 #endif
1146 dev->pa_brdaddr = dev->pa_addr | ~dev->pa_mask;
1147 ret = 0;
1148 break;
1149
1150 case SIOCGIFBRDADDR: /* Get the broadcast address */
1151 (*(struct sockaddr_in *)
1152 &ifr.ifr_broadaddr).sin_addr.s_addr = dev->pa_brdaddr;
1153 (*(struct sockaddr_in *)
1154 &ifr.ifr_broadaddr).sin_family = dev->family;
1155 (*(struct sockaddr_in *)
1156 &ifr.ifr_broadaddr).sin_port = 0;
1157 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1158 ret = 0;
1159 break;
1160
1161 case SIOCSIFBRDADDR: /* Set the broadcast address */
1162 dev->pa_brdaddr = (*(struct sockaddr_in *)
1163 &ifr.ifr_broadaddr).sin_addr.s_addr;
1164 ret = 0;
1165 break;
1166
1167 case SIOCGIFDSTADDR: /* Get the destination address (for point-to-point links) */
1168 (*(struct sockaddr_in *)
1169 &ifr.ifr_dstaddr).sin_addr.s_addr = dev->pa_dstaddr;
1170 (*(struct sockaddr_in *)
1171 &ifr.ifr_broadaddr).sin_family = dev->family;
1172 (*(struct sockaddr_in *)
1173 &ifr.ifr_broadaddr).sin_port = 0;
1174 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1175 ret = 0;
1176 break;
1177
1178 case SIOCSIFDSTADDR: /* Set the destination address (for point-to-point links) */
1179 dev->pa_dstaddr = (*(struct sockaddr_in *)
1180 &ifr.ifr_dstaddr).sin_addr.s_addr;
1181 ret = 0;
1182 break;
1183
1184 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1185 (*(struct sockaddr_in *)
1186 &ifr.ifr_netmask).sin_addr.s_addr = dev->pa_mask;
1187 (*(struct sockaddr_in *)
1188 &ifr.ifr_netmask).sin_family = dev->family;
1189 (*(struct sockaddr_in *)
1190 &ifr.ifr_netmask).sin_port = 0;
1191 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1192 ret = 0;
1193 break;
1194
1195 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1196 {
1197 unsigned long mask = (*(struct sockaddr_in *)
1198 &ifr.ifr_netmask).sin_addr.s_addr;
1199 ret = -EINVAL;
1200 /*
1201 * The mask we set must be legal.
1202 */
1203 if (bad_mask(mask,0))
1204 break;
1205 dev->pa_mask = mask;
1206 ret = 0;
1207 }
1208 break;
1209
1210 case SIOCGIFMETRIC: /* Get the metric on the interface (currently unused) */
1211
1212 ifr.ifr_metric = dev->metric;
1213 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1214 ret = 0;
1215 break;
1216
1217 case SIOCSIFMETRIC: /* Set the metric on the interface (currently unused) */
1218 dev->metric = ifr.ifr_metric;
1219 ret = 0;
1220 break;
1221
1222 case SIOCGIFMTU: /* Get the MTU of a device */
1223 ifr.ifr_mtu = dev->mtu;
1224 memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
1225 ret = 0;
1226 break;
1227
1228 case SIOCSIFMTU: /* Set the MTU of a device */
1229
1230 /*
1231 * MTU must be positive and under the page size problem
1232 */
1233
1234 if(ifr.ifr_mtu<1 || ifr.ifr_mtu>3800)
1235 return -EINVAL;
1236 dev->mtu = ifr.ifr_mtu;
1237 ret = 0;
1238 break;
1239
1240 case SIOCGIFMEM: /* Get the per device memory space. We can add this but currently
1241 do not support it */
1242 printk("NET: ioctl(SIOCGIFMEM, 0x%08X)\n", (int)arg);
1243 ret = -EINVAL;
1244 break;
1245
1246 case SIOCSIFMEM: /* Set the per device memory buffer space. Not applicable in our case */
1247 printk("NET: ioctl(SIOCSIFMEM, 0x%08X)\n", (int)arg);
1248 ret = -EINVAL;
1249 break;
1250
1251 case OLD_SIOCGIFHWADDR: /* Get the hardware address. This will change and SIFHWADDR will be added */
1252 memcpy(ifr.old_ifr_hwaddr,dev->dev_addr, MAX_ADDR_LEN);
1253 memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
1254 ret=0;
1255 break;
1256
1257 case SIOCGIFHWADDR:
1258 memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
1259 ifr.ifr_hwaddr.sa_family=dev->type;
1260 memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
1261 ret=0;
1262 break;
1263
1264 case SIOCSIFHWADDR:
1265 if(dev->set_mac_address==NULL)
1266 return -EOPNOTSUPP;
1267 if(ifr.ifr_hwaddr.sa_family!=dev->type)
1268 return -EINVAL;
1269 ret=dev->set_mac_address(dev,ifr.ifr_hwaddr.sa_data);
1270 break;
1271
1272 case SIOCDEVPRIVATE:
1273 if(dev->do_ioctl==NULL)
1274 return -EOPNOTSUPP;
1275 ret=dev->do_ioctl(dev, &ifr);
1276 memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
1277 break;
1278
1279 case SIOCGIFMAP:
1280 ifr.ifr_map.mem_start=dev->mem_start;
1281 ifr.ifr_map.mem_end=dev->mem_end;
1282 ifr.ifr_map.base_addr=dev->base_addr;
1283 ifr.ifr_map.irq=dev->irq;
1284 ifr.ifr_map.dma=dev->dma;
1285 ifr.ifr_map.port=dev->if_port;
1286 memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
1287 ret=0;
1288 break;
1289
1290 case SIOCSIFMAP:
1291 if(dev->set_config==NULL)
1292 return -EOPNOTSUPP;
1293 return dev->set_config(dev,&ifr.ifr_map);
1294
1295 case SIOCGIFSLAVE:
1296 #ifdef CONFIG_SLAVE_BALANCING
1297 if(dev->slave==NULL)
1298 return -ENOENT;
1299 strncpy(ifr.ifr_name,dev->name,sizeof(ifr.ifr_name));
1300 memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
1301 ret=0;
1302 #else
1303 return -ENOENT;
1304 #endif
1305 break;
1306 #ifdef CONFIG_SLAVE_BALANCING
1307 case SIOCSIFSLAVE:
1308 {
1309
1310 /*
1311 * Fun game. Get the device up and the flags right without
1312 * letting some scummy user confuse us.
1313 */
1314 unsigned long flags;
1315 struct device *slave=dev_get(ifr.ifr_slave);
1316 save_flags(flags);
1317 if(slave==NULL)
1318 {
1319 return -ENODEV;
1320 }
1321 cli();
1322 if((slave->flags&(IFF_UP|IFF_RUNNING))!=(IFF_UP|IFF_RUNNING))
1323 {
1324 restore_flags(flags);
1325 return -EINVAL;
1326 }
1327 if(dev->flags&IFF_SLAVE)
1328 {
1329 restore_flags(flags);
1330 return -EBUSY;
1331 }
1332 if(dev->slave!=NULL)
1333 {
1334 restore_flags(flags);
1335 return -EBUSY;
1336 }
1337 if(slave->flags&IFF_SLAVE)
1338 {
1339 restore_flags(flags);
1340 return -EBUSY;
1341 }
1342 dev->slave=slave;
1343 slave->flags|=IFF_SLAVE;
1344 dev->flags|=IFF_MASTER;
1345 restore_flags(flags);
1346 ret=0;
1347 }
1348 break;
1349 #endif
1350 /*
1351 * Unknown ioctl
1352 */
1353
1354 default:
1355 ret = -EINVAL;
1356 }
1357 return(ret);
1358 }
1359
1360
1361 /*
1362 * This function handles all "interface"-type I/O control requests. The actual
1363 * 'doing' part of this is dev_ifsioc above.
1364 */
1365
1366 int dev_ioctl(unsigned int cmd, void *arg)
/* */
1367 {
1368 switch(cmd)
1369 {
1370 case SIOCGIFCONF:
1371 (void) dev_ifconf((char *) arg);
1372 return 0;
1373
1374 /*
1375 * Ioctl calls that can be done by all.
1376 */
1377
1378 case SIOCGIFFLAGS:
1379 case SIOCGIFADDR:
1380 case SIOCGIFDSTADDR:
1381 case SIOCGIFBRDADDR:
1382 case SIOCGIFNETMASK:
1383 case SIOCGIFMETRIC:
1384 case SIOCGIFMTU:
1385 case SIOCGIFMEM:
1386 case SIOCGIFHWADDR:
1387 case SIOCSIFHWADDR:
1388 case OLD_SIOCGIFHWADDR:
1389 case SIOCGIFSLAVE:
1390 case SIOCGIFMAP:
1391 return dev_ifsioc(arg, cmd);
1392
1393 /*
1394 * Ioctl calls requiring the power of a superuser
1395 */
1396
1397 case SIOCSIFFLAGS:
1398 case SIOCSIFADDR:
1399 case SIOCSIFDSTADDR:
1400 case SIOCSIFBRDADDR:
1401 case SIOCSIFNETMASK:
1402 case SIOCSIFMETRIC:
1403 case SIOCSIFMTU:
1404 case SIOCSIFMEM:
1405 case SIOCSIFMAP:
1406 case SIOCSIFSLAVE:
1407 case SIOCDEVPRIVATE:
1408 if (!suser())
1409 return -EPERM;
1410 return dev_ifsioc(arg, cmd);
1411
1412 case SIOCSIFLINK:
1413 return -EINVAL;
1414
1415 /*
1416 * Unknown ioctl.
1417 */
1418
1419 default:
1420 return -EINVAL;
1421 }
1422 }
1423
1424
1425 /*
1426 * Initialize the DEV module. At boot time this walks the device list and
1427 * unhooks any devices that fail to initialise (normally hardware not
1428 * present) and leaves us with a valid list of present and active devices.
1429 *
1430 * The PCMCIA code may need to change this a little, and add a pair
1431 * of register_inet_device() unregister_inet_device() calls. This will be
1432 * needed for ethernet as modules support.
1433 */
1434
1435 void dev_init(void)
/* ![[last]](../icons/n_last.png)
*/
1436 {
1437 struct device *dev, *dev2;
1438
1439 /*
1440 * Add the devices.
1441 * If the call to dev->init fails, the dev is removed
1442 * from the chain disconnecting the device until the
1443 * next reboot.
1444 */
1445
1446 dev2 = NULL;
1447 for (dev = dev_base; dev != NULL; dev=dev->next)
1448 {
1449 if (dev->init && dev->init(dev))
1450 {
1451 /*
1452 * It failed to come up. Unhook it.
1453 */
1454
1455 if (dev2 == NULL)
1456 dev_base = dev->next;
1457 else
1458 dev2->next = dev->next;
1459 }
1460 else
1461 {
1462 dev2 = dev;
1463 }
1464 }
1465 }
![[bottom]](../icons/n_bottom.png){kind=icon}
*/