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[PATCH] uml: networking - clear transport-specific structure
[linux-2.6-block.git] / arch / um / drivers / net_kern.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
3 * James Leu (jleu@mindspring.net).
4 * Copyright (C) 2001 by various other people who didn't put their name here.
5 * Licensed under the GPL.
6 */
7
8#include "linux/config.h"
9#include "linux/kernel.h"
10#include "linux/netdevice.h"
11#include "linux/rtnetlink.h"
12#include "linux/skbuff.h"
13#include "linux/socket.h"
14#include "linux/spinlock.h"
15#include "linux/module.h"
16#include "linux/init.h"
17#include "linux/etherdevice.h"
18#include "linux/list.h"
19#include "linux/inetdevice.h"
20#include "linux/ctype.h"
21#include "linux/bootmem.h"
22#include "linux/ethtool.h"
d052d1be 23#include "linux/platform_device.h"
1da177e4
LT		 24#include "asm/uaccess.h"
25#include "user_util.h"
26#include "kern_util.h"
27#include "net_kern.h"
28#include "net_user.h"
29#include "mconsole_kern.h"
30#include "init.h"
31#include "irq_user.h"
32#include "irq_kern.h"
33
34#define DRIVER_NAME "uml-netdev"
35
36static DEFINE_SPINLOCK(opened_lock);
9010772c 37static LIST_HEAD(opened);
1da177e4
LT		 38
39static int uml_net_rx(struct net_device *dev)
40{
41 struct uml_net_private *lp = dev->priv;
42 int pkt_len;
43 struct sk_buff *skb;
44
45 /* If we can't allocate memory, try again next round. */
46 skb = dev_alloc_skb(dev->mtu);
47 if (skb == NULL) {
48 lp->stats.rx_dropped++;
49 return 0;
50 }
51
52 skb->dev = dev;
53 skb_put(skb, dev->mtu);
54 skb->mac.raw = skb->data;
55 pkt_len = (*lp->read)(lp->fd, &skb, lp);
56
57 if (pkt_len > 0) {
58 skb_trim(skb, pkt_len);
59 skb->protocol = (*lp->protocol)(skb);
60 netif_rx(skb);
61
62 lp->stats.rx_bytes += skb->len;
63 lp->stats.rx_packets++;
64 return pkt_len;
65 }
66
67 kfree_skb(skb);
68 return pkt_len;
69}
70
71irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
72{
73 struct net_device *dev = dev_id;
74 struct uml_net_private *lp = dev->priv;
75 int err;
76
77 if(!netif_running(dev))
78 return(IRQ_NONE);
79
80 spin_lock(&lp->lock);
81 while((err = uml_net_rx(dev)) > 0) ;
82 if(err < 0) {
83 printk(KERN_ERR
84 "Device '%s' read returned %d, shutting it down\n",
85 dev->name, err);
86 dev_close(dev);
87 goto out;
88 }
89 reactivate_fd(lp->fd, UM_ETH_IRQ);
90
91 out:
92 spin_unlock(&lp->lock);
93 return(IRQ_HANDLED);
94}
95
96static int uml_net_open(struct net_device *dev)
97{
98 struct uml_net_private *lp = dev->priv;
1da177e4
LT		 99 int err;
100
101 spin_lock(&lp->lock);
102
103 if(lp->fd >= 0){
104 err = -ENXIO;
105 goto out;
106 }
107
108 if(!lp->have_mac){
0e76422c 109 dev_ip_addr(dev, &lp->mac[2]);
1da177e4
LT		 110 set_ether_mac(dev, lp->mac);
111 }
112
113 lp->fd = (*lp->open)(&lp->user);
114 if(lp->fd < 0){
115 err = lp->fd;
116 goto out;
117 }
118
119 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
120 SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
121 if(err != 0){
122 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
123 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
124 lp->fd = -1;
125 err = -ENETUNREACH;
126 }
127
128 lp->tl.data = (unsigned long) &lp->user;
129 netif_start_queue(dev);
130
131 /* clear buffer - it can happen that the host side of the interface
132 * is full when we get here. In this case, new data is never queued,
133 * SIGIOs never arrive, and the net never works.
134 */
135 while((err = uml_net_rx(dev)) > 0) ;
136
137 out:
138 spin_unlock(&lp->lock);
139 return(err);
140}
141
142static int uml_net_close(struct net_device *dev)
143{
144 struct uml_net_private *lp = dev->priv;
145
146 netif_stop_queue(dev);
147 spin_lock(&lp->lock);
148
1da177e4
LT		 149 free_irq(dev->irq, dev);
150 if(lp->close != NULL)
151 (*lp->close)(lp->fd, &lp->user);
152 lp->fd = -1;
8d93c700 153 list_del(&lp->list);
1da177e4
LT		 154
155 spin_unlock(&lp->lock);
156 return 0;
157}
158
159static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
160{
161 struct uml_net_private *lp = dev->priv;
162 unsigned long flags;
163 int len;
164
165 netif_stop_queue(dev);
166
167 spin_lock_irqsave(&lp->lock, flags);
168
169 len = (*lp->write)(lp->fd, &skb, lp);
170
171 if(len == skb->len) {
172 lp->stats.tx_packets++;
173 lp->stats.tx_bytes += skb->len;
174 dev->trans_start = jiffies;
175 netif_start_queue(dev);
176
177 /* this is normally done in the interrupt when tx finishes */
178 netif_wake_queue(dev);
179 }
180 else if(len == 0){
181 netif_start_queue(dev);
182 lp->stats.tx_dropped++;
183 }
184 else {
185 netif_start_queue(dev);
186 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
187 }
188
189 spin_unlock_irqrestore(&lp->lock, flags);
190
191 dev_kfree_skb(skb);
192
193 return 0;
194}
195
196static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
197{
198 struct uml_net_private *lp = dev->priv;
199 return &lp->stats;
200}
201
202static void uml_net_set_multicast_list(struct net_device *dev)
203{
204 if (dev->flags & IFF_PROMISC) return;
205 else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
206 else dev->flags &= ~IFF_ALLMULTI;
207}
208
209static void uml_net_tx_timeout(struct net_device *dev)
210{
211 dev->trans_start = jiffies;
212 netif_wake_queue(dev);
213}
214
215static int uml_net_set_mac(struct net_device *dev, void *addr)
216{
217 struct uml_net_private *lp = dev->priv;
218 struct sockaddr *hwaddr = addr;
219
220 spin_lock(&lp->lock);
221 memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
222 spin_unlock(&lp->lock);
223
224 return(0);
225}
226
227static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
228{
229 struct uml_net_private *lp = dev->priv;
230 int err = 0;
231
232 spin_lock(&lp->lock);
233
234 new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
235 if(new_mtu < 0){
236 err = new_mtu;
237 goto out;
238 }
239
240 dev->mtu = new_mtu;
241
242 out:
243 spin_unlock(&lp->lock);
244 return err;
245}
246
6d387484
CH		 247static void uml_net_get_drvinfo(struct net_device *dev,
248 struct ethtool_drvinfo *info)
1da177e4 249{
6d387484
CH		 250 strcpy(info->driver, DRIVER_NAME);
251 strcpy(info->version, "42");
1da177e4
LT		 252}
253
6d387484
CH		 254static struct ethtool_ops uml_net_ethtool_ops = {
255 .get_drvinfo = uml_net_get_drvinfo,
256 .get_link = ethtool_op_get_link,
257};
258
1da177e4
LT		 259void uml_net_user_timer_expire(unsigned long _conn)
260{
261#ifdef undef
262 struct connection *conn = (struct connection *)_conn;
263
264 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
265 do_connect(conn);
266#endif
267}
268
269static DEFINE_SPINLOCK(devices_lock);
9010772c 270static LIST_HEAD(devices);
1da177e4 271
3ae5eaec
RK		 272static struct platform_driver uml_net_driver = {
273 .driver = {
274 .name = DRIVER_NAME,
275 },
1da177e4
LT		 276};
277static int driver_registered;
278
279static int eth_configure(int n, void *init, char *mac,
280 struct transport *transport)
281{
282 struct uml_net *device;
283 struct net_device *dev;
284 struct uml_net_private *lp;
285 int save, err, size;
286
287 size = transport->private_size + sizeof(struct uml_net_private) +
288 sizeof(((struct uml_net_private *) 0)->user);
289
290 device = kmalloc(sizeof(*device), GFP_KERNEL);
291 if (device == NULL) {
292 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
293 return(1);
294 }
295
296 memset(device, 0, sizeof(*device));
297 INIT_LIST_HEAD(&device->list);
298 device->index = n;
299
300 spin_lock(&devices_lock);
301 list_add(&device->list, &devices);
302 spin_unlock(&devices_lock);
303
304 if (setup_etheraddr(mac, device->mac))
305 device->have_mac = 1;
306
307 printk(KERN_INFO "Netdevice %d ", n);
308 if (device->have_mac)
309 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
310 device->mac[0], device->mac[1],
311 device->mac[2], device->mac[3],
312 device->mac[4], device->mac[5]);
313 printk(": ");
314 dev = alloc_etherdev(size);
315 if (dev == NULL) {
316 printk(KERN_ERR "eth_configure: failed to allocate device\n");
317 return 1;
318 }
319
e56a7885
PBG		 320 lp = dev->priv;
321 /* This points to the transport private data. It's still clear, but we
322 * must memset it to 0 *now*. Let's help the drivers. */
323 memset(lp, 0, size);
324
1da177e4
LT		 325 /* sysfs register */
326 if (!driver_registered) {
3ae5eaec 327 platform_driver_register(&uml_net_driver);
1da177e4
LT		 328 driver_registered = 1;
329 }
330 device->pdev.id = n;
331 device->pdev.name = DRIVER_NAME;
332 platform_device_register(&device->pdev);
333 SET_NETDEV_DEV(dev,&device->pdev.dev);
334
335 /* If this name ends up conflicting with an existing registered
336 * netdevice, that is OK, register_netdev{,ice}() will notice this
337 * and fail.
338 */
339 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
340 device->dev = dev;
341
342 (*transport->kern->init)(dev, init);
343
344 dev->mtu = transport->user->max_packet;
345 dev->open = uml_net_open;
346 dev->hard_start_xmit = uml_net_start_xmit;
347 dev->stop = uml_net_close;
348 dev->get_stats = uml_net_get_stats;
349 dev->set_multicast_list = uml_net_set_multicast_list;
350 dev->tx_timeout = uml_net_tx_timeout;
351 dev->set_mac_address = uml_net_set_mac;
352 dev->change_mtu = uml_net_change_mtu;
6d387484 353 dev->ethtool_ops = &uml_net_ethtool_ops;
1da177e4
LT		 354 dev->watchdog_timeo = (HZ >> 1);
355 dev->irq = UM_ETH_IRQ;
356
357 rtnl_lock();
358 err = register_netdevice(dev);
359 rtnl_unlock();
360 if (err) {
361 device->dev = NULL;
362 /* XXX: should we call ->remove() here? */
363 free_netdev(dev);
364 return 1;
365 }
1da177e4
LT		 366
367 /* lp.user is the first four bytes of the transport data, which
368 * has already been initialized. This structure assignment will
369 * overwrite that, so we make sure that .user gets overwritten with
370 * what it already has.
371 */
372 save = lp->user[0];
373 *lp = ((struct uml_net_private)
374 { .list = LIST_HEAD_INIT(lp->list),
375 .dev = dev,
376 .fd = -1,
377 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
378 .have_mac = device->have_mac,
379 .protocol = transport->kern->protocol,
380 .open = transport->user->open,
381 .close = transport->user->close,
382 .remove = transport->user->remove,
383 .read = transport->kern->read,
384 .write = transport->kern->write,
385 .add_address = transport->user->add_address,
386 .delete_address = transport->user->delete_address,
387 .set_mtu = transport->user->set_mtu,
388 .user = { save } });
389
390 init_timer(&lp->tl);
391 spin_lock_init(&lp->lock);
392 lp->tl.function = uml_net_user_timer_expire;
393 if (lp->have_mac)
394 memcpy(lp->mac, device->mac, sizeof(lp->mac));
395
396 if (transport->user->init)
397 (*transport->user->init)(&lp->user, dev);
398
399 if (device->have_mac)
400 set_ether_mac(dev, device->mac);
401
402 spin_lock(&opened_lock);
403 list_add(&lp->list, &opened);
404 spin_unlock(&opened_lock);
405
406 return(0);
407}
408
409static struct uml_net *find_device(int n)
410{
411 struct uml_net *device;
412 struct list_head *ele;
413
414 spin_lock(&devices_lock);
415 list_for_each(ele, &devices){
416 device = list_entry(ele, struct uml_net, list);
417 if(device->index == n)
418 goto out;
419 }
420 device = NULL;
421 out:
422 spin_unlock(&devices_lock);
423 return(device);
424}
425
426static int eth_parse(char *str, int *index_out, char **str_out)
427{
428 char *end;
429 int n;
430
431 n = simple_strtoul(str, &end, 0);
432 if(end == str){
433 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
434 return(1);
435 }
436 if(n < 0){
437 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
438 return(1);
439 }
440 str = end;
441 if(*str != '='){
442 printk(KERN_ERR
443 "eth_setup: expected '=' after device number\n");
444 return(1);
445 }
446 str++;
447 if(find_device(n)){
448 printk(KERN_ERR "eth_setup: Device %d already configured\n",
449 n);
450 return(1);
451 }
452 if(index_out) *index_out = n;
453 *str_out = str;
454 return(0);
455}
456
457struct eth_init {
458 struct list_head list;
459 char *init;
460 int index;
461};
462
463/* Filled in at boot time. Will need locking if the transports become
464 * modular.
465 */
466struct list_head transports = LIST_HEAD_INIT(transports);
467
468/* Filled in during early boot */
469struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
470
471static int check_transport(struct transport *transport, char *eth, int n,
472 void **init_out, char **mac_out)
473{
474 int len;
475
476 len = strlen(transport->name);
477 if(strncmp(eth, transport->name, len))
478 return(0);
479
480 eth += len;
481 if(*eth == ',')
482 eth++;
483 else if(*eth != '\0')
484 return(0);
485
486 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
487 if(*init_out == NULL)
488 return(1);
489
490 if(!transport->setup(eth, mac_out, *init_out)){
491 kfree(*init_out);
492 *init_out = NULL;
493 }
494 return(1);
495}
496
497void register_transport(struct transport *new)
498{
499 struct list_head *ele, *next;
500 struct eth_init *eth;
501 void *init;
502 char *mac = NULL;
503 int match;
504
505 list_add(&new->list, &transports);
506
507 list_for_each_safe(ele, next, &eth_cmd_line){
508 eth = list_entry(ele, struct eth_init, list);
509 match = check_transport(new, eth->init, eth->index, &init,
510 &mac);
511 if(!match)
512 continue;
513 else if(init != NULL){
514 eth_configure(eth->index, init, mac, new);
515 kfree(init);
516 }
517 list_del(&eth->list);
518 }
519}
520
521static int eth_setup_common(char *str, int index)
522{
523 struct list_head *ele;
524 struct transport *transport;
525 void *init;
526 char *mac = NULL;
527
528 list_for_each(ele, &transports){
529 transport = list_entry(ele, struct transport, list);
530 if(!check_transport(transport, str, index, &init, &mac))
531 continue;
532 if(init != NULL){
533 eth_configure(index, init, mac, transport);
534 kfree(init);
535 }
536 return(1);
537 }
538 return(0);
539}
540
541static int eth_setup(char *str)
542{
543 struct eth_init *new;
544 int n, err;
545
546 err = eth_parse(str, &n, &str);
547 if(err) return(1);
548
549 new = alloc_bootmem(sizeof(new));
550 if (new == NULL){
551 printk("eth_init : alloc_bootmem failed\n");
552 return(1);
553 }
554
555 INIT_LIST_HEAD(&new->list);
556 new->index = n;
557 new->init = str;
558
559 list_add_tail(&new->list, &eth_cmd_line);
560 return(1);
561}
562
563__setup("eth", eth_setup);
564__uml_help(eth_setup,
565"eth[0-9]+=<transport>,<options>\n"
566" Configure a network device.\n\n"
567);
568
569#if 0
570static int eth_init(void)
571{
572 struct list_head *ele, *next;
573 struct eth_init *eth;
574
575 list_for_each_safe(ele, next, &eth_cmd_line){
576 eth = list_entry(ele, struct eth_init, list);
577
578 if(eth_setup_common(eth->init, eth->index))
579 list_del(&eth->list);
580 }
581
582 return(1);
583}
584__initcall(eth_init);
585#endif
586
587static int net_config(char *str)
588{
589 int n, err;
590
591 err = eth_parse(str, &n, &str);
592 if(err) return(err);
593
970d6e3a 594 str = kstrdup(str, GFP_KERNEL);
1da177e4
LT		 595 if(str == NULL){
596 printk(KERN_ERR "net_config failed to strdup string\n");
597 return(-1);
598 }
599 err = !eth_setup_common(str, n);
600 if(err)
601 kfree(str);
602 return(err);
603}
604
29d56cfe
JD		 605static int net_id(char **str, int *start_out, int *end_out)
606{
607 char *end;
608 int n;
609
610 n = simple_strtoul(*str, &end, 0);
611 if((*end != '\0') || (end == *str))
612 return -1;
613
614 *start_out = n;
615 *end_out = n;
616 *str = end;
617 return n;
618}
619
620static int net_remove(int n)
1da177e4
LT		 621{
622 struct uml_net *device;
623 struct net_device *dev;
624 struct uml_net_private *lp;
1da177e4
LT		 625
626 device = find_device(n);
627 if(device == NULL)
29d56cfe 628 return -ENODEV;
1da177e4
LT		 629
630 dev = device->dev;
631 lp = dev->priv;
29d56cfe
JD		 632 if(lp->fd > 0)
633 return -EBUSY;
1da177e4
LT		 634 if(lp->remove != NULL) (*lp->remove)(&lp->user);
635 unregister_netdev(dev);
636 platform_device_unregister(&device->pdev);
637
638 list_del(&device->list);
639 kfree(device);
640 free_netdev(dev);
29d56cfe 641 return 0;
1da177e4
LT		 642}
643
644static struct mc_device net_mc = {
645 .name = "eth",
646 .config = net_config,
647 .get_config = NULL,
29d56cfe 648 .id = net_id,
1da177e4
LT		 649 .remove = net_remove,
650};
651
652static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
653 void *ptr)
654{
655 struct in_ifaddr *ifa = ptr;
1da177e4
LT		 656 struct net_device *dev = ifa->ifa_dev->dev;
657 struct uml_net_private *lp;
658 void (*proc)(unsigned char *, unsigned char *, void *);
659 unsigned char addr_buf[4], netmask_buf[4];
660
661 if(dev->open != uml_net_open) return(NOTIFY_DONE);
662
663 lp = dev->priv;
664
665 proc = NULL;
666 switch (event){
667 case NETDEV_UP:
668 proc = lp->add_address;
669 break;
670 case NETDEV_DOWN:
671 proc = lp->delete_address;
672 break;
673 }
674 if(proc != NULL){
0e76422c
BS		 675 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
676 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
1da177e4
LT		 677 (*proc)(addr_buf, netmask_buf, &lp->user);
678 }
679 return(NOTIFY_DONE);
680}
681
682struct notifier_block uml_inetaddr_notifier = {
683 .notifier_call = uml_inetaddr_event,
684};
685
686static int uml_net_init(void)
687{
688 struct list_head *ele;
689 struct uml_net_private *lp;
690 struct in_device *ip;
691 struct in_ifaddr *in;
692
693 mconsole_register_dev(&net_mc);
694 register_inetaddr_notifier(&uml_inetaddr_notifier);
695
696 /* Devices may have been opened already, so the uml_inetaddr_notifier
697 * didn't get a chance to run for them. This fakes it so that
698 * addresses which have already been set up get handled properly.
699 */
700 list_for_each(ele, &opened){
701 lp = list_entry(ele, struct uml_net_private, list);
702 ip = lp->dev->ip_ptr;
703 if(ip == NULL) continue;
704 in = ip->ifa_list;
705 while(in != NULL){
706 uml_inetaddr_event(NULL, NETDEV_UP, in);
707 in = in->ifa_next;
708 }
709 }
710
711 return(0);
712}
713
714__initcall(uml_net_init);
715
716static void close_devices(void)
717{
718 struct list_head *ele;
719 struct uml_net_private *lp;
720
721 list_for_each(ele, &opened){
722 lp = list_entry(ele, struct uml_net_private, list);
8d93c700 723 free_irq(lp->dev->irq, lp->dev);
1da177e4
LT		 724 if((lp->close != NULL) && (lp->fd >= 0))
725 (*lp->close)(lp->fd, &lp->user);
726 if(lp->remove != NULL) (*lp->remove)(&lp->user);
727 }
728}
729
730__uml_exitcall(close_devices);
731
732int setup_etheraddr(char *str, unsigned char *addr)
733{
734 char *end;
735 int i;
736
737 if(str == NULL)
738 return(0);
739 for(i=0;i<6;i++){
740 addr[i] = simple_strtoul(str, &end, 16);
741 if((end == str) ||
742 ((*end != ':') && (*end != ',') && (*end != '\0'))){
743 printk(KERN_ERR
744 "setup_etheraddr: failed to parse '%s' "
745 "as an ethernet address\n", str);
746 return(0);
747 }
748 str = end + 1;
749 }
750 if(addr[0] & 1){
751 printk(KERN_ERR
752 "Attempt to assign a broadcast ethernet address to a "
753 "device disallowed\n");
754 return(0);
755 }
756 return(1);
757}
758
0e76422c 759void dev_ip_addr(void *d, unsigned char *bin_buf)
1da177e4
LT		 760{
761 struct net_device *dev = d;
762 struct in_device *ip = dev->ip_ptr;
763 struct in_ifaddr *in;
1da177e4
LT		 764
765 if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
766 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
767 "IP address\n");
768 return;
769 }
0e76422c 770 memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
1da177e4
LT		 771}
772
773void set_ether_mac(void *d, unsigned char *addr)
774{
775 struct net_device *dev = d;
776
777 memcpy(dev->dev_addr, addr, ETH_ALEN);
778}
779
780struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
781{
782 if((skb != NULL) && (skb_tailroom(skb) < extra)){
783 struct sk_buff *skb2;
784
785 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
786 dev_kfree_skb(skb);
787 skb = skb2;
788 }
789 if(skb != NULL) skb_put(skb, extra);
790 return(skb);
791}
792
793void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
794 void *),
795 void *arg)
796{
797 struct net_device *dev = d;
798 struct in_device *ip = dev->ip_ptr;
799 struct in_ifaddr *in;
800 unsigned char address[4], netmask[4];
801
802 if(ip == NULL) return;
803 in = ip->ifa_list;
804 while(in != NULL){
0e76422c
BS		 805 memcpy(address, &in->ifa_address, sizeof(address));
806 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
1da177e4
LT		 807 (*cb)(address, netmask, arg);
808 in = in->ifa_next;
809 }
810}
811
812int dev_netmask(void *d, void *m)
813{
814 struct net_device *dev = d;
815 struct in_device *ip = dev->ip_ptr;
816 struct in_ifaddr *in;
817 __u32 *mask_out = m;
818
819 if(ip == NULL)
820 return(1);
821
822 in = ip->ifa_list;
823 if(in == NULL)
824 return(1);
825
826 *mask_out = in->ifa_mask;
827 return(0);
828}
829
830void *get_output_buffer(int *len_out)
831{
832 void *ret;
833
834 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
835 if(ret) *len_out = PAGE_SIZE;
836 else *len_out = 0;
837 return(ret);
838}
839
840void free_output_buffer(void *buffer)
841{
842 free_pages((unsigned long) buffer, 0);
843}
844
845int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
846 char **gate_addr)
847{
848 char *remain;
849
850 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
851 if(remain != NULL){
852 printk("tap_setup_common - Extra garbage on specification : "
853 "'%s'\n", remain);
854 return(1);
855 }
856
857 return(0);
858}
859
860unsigned short eth_protocol(struct sk_buff *skb)
861{
862 return(eth_type_trans(skb, skb->dev));
863}
864
865/*
866 * Overrides for Emacs so that we follow Linus's tabbing style.
867 * Emacs will notice this stuff at the end of the file and automatically
868 * adjust the settings for this buffer only. This must remain at the end
869 * of the file.
870 * ---------------------------------------------------------------------------
871 * Local variables:
872 * c-file-style: "linux"
873 * End:
874 */
Linux 6.x block layer and io_uring tree(s)