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1.1 root 1: /*
2: * Linux network driver support.
3: *
4: * Copyright (C) 1996 The University of Utah and the Computer Systems
5: * Laboratory at the University of Utah (CSL)
6: *
7: * This program is free software; you can redistribute it and/or modify
8: * it under the terms of the GNU General Public License as published by
9: * the Free Software Foundation; either version 2, or (at your option)
10: * any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20: *
21: * Author: Shantanu Goel, University of Utah CSL
22: */
23:
24: /*
25: * INET An implementation of the TCP/IP protocol suite for the LINUX
26: * operating system. INET is implemented using the BSD Socket
27: * interface as the means of communication with the user level.
28: *
29: * Ethernet-type device handling.
30: *
31: * Version: @(#)eth.c 1.0.7 05/25/93
32: *
33: * Authors: Ross Biro, <[email protected]>
34: * Fred N. van Kempen, <[email protected]>
35: * Mark Evans, <[email protected]>
36: * Florian La Roche, <[email protected]>
37: * Alan Cox, <[email protected]>
38: *
39: * Fixes:
40: * Mr Linux : Arp problems
41: * Alan Cox : Generic queue tidyup (very tiny here)
42: * Alan Cox : eth_header ntohs should be htons
43: * Alan Cox : eth_rebuild_header missing an htons and
44: * minor other things.
45: * Tegge : Arp bug fixes.
46: * Florian : Removed many unnecessary functions, code cleanup
47: * and changes for new arp and skbuff.
48: * Alan Cox : Redid header building to reflect new format.
49: * Alan Cox : ARP only when compiled with CONFIG_INET
50: * Greg Page : 802.2 and SNAP stuff.
51: * Alan Cox : MAC layer pointers/new format.
52: * Paul Gortmaker : eth_copy_and_sum shouldn't csum padding.
53: * Alan Cox : Protect against forwarding explosions with
54: * older network drivers and IFF_ALLMULTI
55: *
56: * This program is free software; you can redistribute it and/or
57: * modify it under the terms of the GNU General Public License
58: * as published by the Free Software Foundation; either version
59: * 2 of the License, or (at your option) any later version.
60: */
61:
62: #include <sys/types.h>
63:
64: #include <mach/mach_types.h>
65: #include <mach/kern_return.h>
66: #include <mach/mig_errors.h>
67: #include <mach/port.h>
68: #include <mach/vm_param.h>
69: #include <mach/notify.h>
70:
71: #include <ipc/ipc_port.h>
72: #include <ipc/ipc_space.h>
73:
74: #include <vm/vm_map.h>
75: #include <vm/vm_kern.h>
76: #include <vm/vm_page.h>
77:
78: #include <device/device_types.h>
79: #include <device/device_port.h>
80: #include <device/if_hdr.h>
81: #include <device/if_ether.h>
82: #include <device/if_hdr.h>
83: #include <device/net_io.h>
84: #include "device_reply.h"
85:
86: #include <i386at/dev_hdr.h>
87: #include <i386at/device_emul.h>
88:
89: #include <i386at/gpl/linux/linux_emul.h>
90:
91: #define MACH_INCLUDE
92: #include <linux/kernel.h>
93: #include <linux/sched.h>
94: #include <linux/string.h>
95: #include <linux/errno.h>
96: #include <linux/delay.h>
97: #include <linux/interrupt.h>
98: #include <linux/malloc.h>
99: #include <linux/netdevice.h>
100: #include <linux/etherdevice.h>
101:
102: /* One of these is associated with each instance of a device. */
103: struct net_data
104: {
105: ipc_port_t port; /* device port */
106: struct ifnet ifnet; /* Mach ifnet structure (needed for filters) */
107: struct device device; /* generic device structure */
108: struct linux_device *dev; /* Linux network device structure */
109: };
110:
111: /* List of sk_buffs waiting to be freed. */
112: static struct sk_buff_head skb_done_list;
113:
114: /* Forward declarations. */
115:
116: extern struct device_emulation_ops linux_net_emulation_ops;
117:
118: static int print_packet_size = 0;
119:
120: /* Linux kernel network support routines. */
121:
122: /* Requeue packet SKB for transmission after the interface DEV
123: has timed out. The priority of the packet is PRI.
124: In Mach, we simply drop the packet like the native drivers. */
125: void
126: dev_queue_xmit (struct sk_buff *skb, struct linux_device *dev, int pri)
127: {
128: dev_kfree_skb (skb, FREE_WRITE);
129: }
130:
131: /* Close the device DEV. */
132: int
133: dev_close (struct linux_device *dev)
134: {
135: return 0;
136: }
137:
138: /* Network software interrupt handler. */
139: void
140: net_bh (void *xxx)
141: {
142: int len;
143: struct sk_buff *skb;
144: struct linux_device *dev;
145:
146: /* Start transmission on interfaces. */
147: for (dev = dev_base; dev; dev = dev->next)
148: {
149: if (dev->base_addr && dev->base_addr != 0xffe0)
150: while (1)
151: {
152: skb = skb_dequeue (&dev->buffs[0]);
153: if (skb)
154: {
155: len = skb->len;
156: if ((*dev->hard_start_xmit) (skb, dev))
157: {
158: skb_queue_head (&dev->buffs[0], skb);
159: mark_bh (NET_BH);
160: break;
161: }
162: else if (print_packet_size)
163: printf ("net_bh: length %d\n", len);
164: }
165: else
166: break;
167: }
168: }
169: }
170:
171: /* Free all sk_buffs on the done list.
172: This routine is called by the iodone thread in ds_routines.c. */
173: void
174: free_skbuffs ()
175: {
176: struct sk_buff *skb;
177:
178: while (1)
179: {
180: skb = skb_dequeue (&skb_done_list);
181: if (skb)
182: {
183: if (skb->copy)
184: {
185: vm_map_copy_discard (skb->copy);
186: skb->copy = NULL;
187: }
188: if (IP_VALID (skb->reply))
189: {
190: ds_device_write_reply (skb->reply, skb->reply_type, 0, skb->len);
191: skb->reply = IP_NULL;
192: }
193: dev_kfree_skb (skb, FREE_WRITE);
194: }
195: else
196: break;
197: }
198: }
199:
200: /* Allocate an sk_buff with SIZE bytes of data space. */
201: struct sk_buff *
202: alloc_skb (unsigned int size, int priority)
203: {
204: return dev_alloc_skb (size);
205: }
206:
207: /* Free SKB. */
208: void
209: kfree_skb (struct sk_buff *skb, int priority)
210: {
211: dev_kfree_skb (skb, priority);
212: }
213:
214: /* Allocate an sk_buff with SIZE bytes of data space. */
215: struct sk_buff *
216: dev_alloc_skb (unsigned int size)
217: {
218: struct sk_buff *skb;
219:
220: skb = linux_kmalloc (sizeof (struct sk_buff) + size, GFP_KERNEL);
221: if (skb)
222: {
223: skb->dev = NULL;
224: skb->reply = IP_NULL;
225: skb->copy = NULL;
226: skb->len = size;
227: skb->prev = skb->next = NULL;
228: skb->list = NULL;
229: if (size)
230: {
231: skb->data = (unsigned char *) (skb + 1);
232: skb->tail = skb->data + size;
233: }
234: else
235: skb->data = skb->tail = NULL;
236: skb->head = skb->data;
237: }
238: return skb;
239: }
240:
241: /* Free the sk_buff SKB. */
242: void
243: dev_kfree_skb (struct sk_buff *skb, int mode)
244: {
245: unsigned flags;
246: extern void *io_done_list;
247:
248: /* Queue sk_buff on done list if there is a
249: page list attached or we need to send a reply.
250: Wakeup the iodone thread to process the list. */
251: if (skb->copy || IP_VALID (skb->reply))
252: {
253: skb_queue_tail (&skb_done_list, skb);
254: save_flags (flags);
255: thread_wakeup ((event_t) &io_done_list);
256: restore_flags (flags);
257: return;
258: }
259: linux_kfree (skb);
260: }
261:
262: /* Accept packet SKB received on an interface. */
263: void
264: netif_rx (struct sk_buff *skb)
265: {
266: ipc_kmsg_t kmsg;
267: struct ether_header *eh;
268: struct packet_header *ph;
269: struct linux_device *dev = skb->dev;
270:
271: assert (skb != NULL);
272:
273: if (print_packet_size)
274: printf ("netif_rx: length %d\n", skb->len);
275:
276: /* Allocate a kernel message buffer. */
277: kmsg = net_kmsg_get ();
278: if (! kmsg)
279: {
280: dev_kfree_skb (skb, FREE_READ);
281: return;
282: }
283:
284: /* Copy packet into message buffer. */
285: eh = (struct ether_header *) (net_kmsg (kmsg)->header);
286: ph = (struct packet_header *) (net_kmsg (kmsg)->packet);
287: memcpy (eh, skb->data, sizeof (struct ether_header));
288: memcpy (ph + 1, skb->data + sizeof (struct ether_header),
289: skb->len - sizeof (struct ether_header));
290: ph->type = eh->ether_type;
291: ph->length = (skb->len - sizeof (struct ether_header)
292: + sizeof (struct packet_header));
293:
294: dev_kfree_skb (skb, FREE_READ);
295:
296: /* Pass packet up to the microkernel. */
297: net_packet (&dev->net_data->ifnet, kmsg,
298: ph->length, ethernet_priority (kmsg));
299: }
300:
301: /* Mach device interface routines. */
302:
303: /* Return a send right associated with network device ND. */
304: static ipc_port_t
305: dev_to_port (void *nd)
306: {
307: return (nd
308: ? ipc_port_make_send (((struct net_data *) nd)->port)
309: : IP_NULL);
310: }
311:
312: static io_return_t
313: device_open (ipc_port_t reply_port, mach_msg_type_name_t reply_port_type,
314: dev_mode_t mode, char *name, device_t *devp)
315: {
316: io_return_t err = D_SUCCESS;
317: ipc_port_t notify;
318: struct ifnet *ifp;
319: struct linux_device *dev;
320: struct net_data *nd;
321:
322: /* Search for the device. */
323: for (dev = dev_base; dev; dev = dev->next)
324: if (dev->base_addr
325: && dev->base_addr != 0xffe0
326: && ! strcmp (name, dev->name))
327: break;
328: if (! dev)
329: return D_NO_SUCH_DEVICE;
330:
331: /* Allocate and initialize device data if this is the first open. */
332: nd = dev->net_data;
333: if (! nd)
334: {
335: dev->net_data = nd = ((struct net_data *)
336: kalloc (sizeof (struct net_data)));
337: if (! nd)
338: {
339: err = D_NO_MEMORY;
340: goto out;
341: }
342: nd->dev = dev;
343: nd->device.emul_data = nd;
344: nd->device.emul_ops = &linux_net_emulation_ops;
345: nd->port = ipc_port_alloc_kernel ();
346: if (nd->port == IP_NULL)
347: {
348: err = KERN_RESOURCE_SHORTAGE;
349: goto out;
350: }
351: ipc_kobject_set (nd->port, (ipc_kobject_t) &nd->device, IKOT_DEVICE);
352: notify = ipc_port_make_sonce (nd->port);
353: ip_lock (nd->port);
354: ipc_port_nsrequest (nd->port, 1, notify, ¬ify);
355: assert (notify == IP_NULL);
356:
357: ifp = &nd->ifnet;
358: ifp->if_unit = dev->name[strlen (dev->name) - 1] - '0';
359: ifp->if_flags = IFF_UP|IFF_RUNNING;
360: ifp->if_mtu = dev->mtu;
361: ifp->if_header_size = dev->hard_header_len;
362: ifp->if_header_format = dev->type;
363: ifp->if_address_size = dev->addr_len;
364: ifp->if_address = dev->dev_addr;
365: if_init_queues (ifp);
366:
367: if (dev->open)
368: {
369: linux_intr_pri = SPL6;
370: if ((*dev->open) (dev))
371: err = D_NO_SUCH_DEVICE;
372: }
373:
374: out:
375: if (err)
376: {
377: if (nd)
378: {
379: if (nd->port != IP_NULL)
380: {
381: ipc_kobject_set (nd->port, IKO_NULL, IKOT_NONE);
382: ipc_port_dealloc_kernel (nd->port);
383: }
384: kfree ((vm_offset_t) nd, sizeof (struct net_data));
385: nd = NULL;
386: dev->net_data = NULL;
387: }
388: }
389: else
390: {
391: dev->flags |= LINUX_IFF_UP|LINUX_IFF_RUNNING;
392: skb_queue_head_init (&dev->buffs[0]);
393: }
394: if (IP_VALID (reply_port))
395: ds_device_open_reply (reply_port, reply_port_type,
396: err, dev_to_port (nd));
397: return MIG_NO_REPLY;
398: }
399:
400: *devp = &nd->device;
401: return D_SUCCESS;
402: }
403:
404: static io_return_t
405: device_write (void *d, ipc_port_t reply_port,
406: mach_msg_type_name_t reply_port_type, dev_mode_t mode,
407: recnum_t bn, io_buf_ptr_t data, unsigned int count,
408: int *bytes_written)
409: {
410: unsigned char *p;
411: int i, amt, skblen, s;
412: io_return_t err = 0;
413: vm_map_copy_t copy = (vm_map_copy_t) data;
414: struct net_data *nd = d;
415: struct linux_device *dev = nd->dev;
416: struct sk_buff *skb;
417:
418: if (count == 0 || count > dev->mtu + dev->hard_header_len)
419: return D_INVALID_SIZE;
420:
421: /* Allocate a sk_buff. */
422: amt = PAGE_SIZE - (copy->offset & PAGE_MASK);
423: skblen = (amt >= count) ? 0 : count;
424: skb = dev_alloc_skb (skblen);
425: if (! skb)
426: return D_NO_MEMORY;
427:
428: /* Copy user data. This is only required if it spans multiple pages. */
429: if (skblen == 0)
430: {
431: assert (copy->cpy_npages == 1);
432:
433: skb->copy = copy;
434: skb->data = ((void *) copy->cpy_page_list[0]->phys_addr
435: + (copy->offset & PAGE_MASK));
436: skb->len = count;
437: skb->head = skb->data;
438: skb->tail = skb->data + skb->len;
439: }
440: else
441: {
442: memcpy (skb->data,
443: ((void *) copy->cpy_page_list[0]->phys_addr
444: + (copy->offset & PAGE_MASK)),
445: amt);
446: count -= amt;
447: p = skb->data + amt;
448: for (i = 1; count > 0 && i < copy->cpy_npages; i++)
449: {
450: amt = PAGE_SIZE;
451: if (amt > count)
452: amt = count;
453: memcpy (p, (void *) copy->cpy_page_list[i]->phys_addr, amt);
454: count -= amt;
455: p += amt;
456: }
457:
458: assert (count == 0);
459:
460: vm_map_copy_discard (copy);
461: }
462:
463: skb->dev = dev;
464: skb->reply = reply_port;
465: skb->reply_type = reply_port_type;
466:
467: /* Queue packet for transmission and schedule a software interrupt. */
468: s = splimp ();
469: if (dev->buffs[0].next != (struct sk_buff *) &dev->buffs[0]
470: || (*dev->hard_start_xmit) (skb, dev))
471: {
472: __skb_queue_tail (&dev->buffs[0], skb);
473: mark_bh (NET_BH);
474: }
475: splx (s);
476:
477: return MIG_NO_REPLY;
478: }
479:
480: static io_return_t
481: device_get_status (void *d, dev_flavor_t flavor, dev_status_t status,
482: mach_msg_type_number_t *count)
483: {
484: return net_getstat (&((struct net_data *) d)->ifnet, flavor, status, count);
485: }
486:
487: static io_return_t
488: device_set_filter (void *d, ipc_port_t port, int priority,
489: filter_t *filter, unsigned filter_count)
490: {
491: return net_set_filter (&((struct net_data *) d)->ifnet,
492: port, priority, filter, filter_count);
493: }
494:
495: struct device_emulation_ops linux_net_emulation_ops =
496: {
497: NULL,
498: NULL,
499: dev_to_port,
500: device_open,
501: NULL,
502: device_write,
503: NULL,
504: NULL,
505: NULL,
506: NULL,
507: device_get_status,
508: device_set_filter,
509: NULL,
510: NULL,
511: NULL,
512: NULL
513: };
514:
515: /* Do any initialization required for network devices. */
516: void
517: linux_net_emulation_init ()
518: {
519: skb_queue_head_init (&skb_done_list);
520: }
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