3 * $Id: unet.c,v 1.2 2001/02/03 18:39:59 mdw Exp $
5 * User-space network device support.
7 * (c) 1998 Mark Wooding
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Usernet.
14 * Usernet is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * Usernet is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with Usernet; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.2 2001/02/03 18:39:59 mdw
33 * Setting the maximum interface count now does the right thing.
35 * Revision 1.1 2001/01/25 22:03:39 mdw
36 * Initial check-in (somewhat belated).
40 /*----- Include files -----------------------------------------------------*/
42 #include <linux/module.h>
44 #include <asm/byteorder.h>
45 #include <asm/segment.h>
47 #include <linux/types.h>
48 #include <linux/kernel.h>
49 #include <linux/wait.h>
50 #include <linux/sched.h>
52 #include <linux/poll.h>
53 #include <linux/netdevice.h>
54 #include <linux/etherdevice.h>
55 #include <linux/if_arp.h>
56 #include <linux/malloc.h>
57 #include <linux/errno.h>
58 #include <linux/init.h>
63 MODULE_AUTHOR("Mark Wooding");
64 MODULE_DESCRIPTION("Allows userland handling of a network interface");
66 /*----- Debugging macros --------------------------------------------------*/
68 #define UNET_DEBUGALWAYS 1
69 #define UNET_DEBUGRUNTIME 0
70 #define UNET_DEBUGNEVER -1
72 /* --- If the macro isn't defined then be switchable at runtime --- */
75 # define UNET_DEBUG UNET_DEBUGRUNTIME
78 /* --- Define the base macro @D@ according to the debug setting --- */
80 #if UNET_DEBUG == UNET_DEBUGALWAYS
82 # define DIF(u, x) if ((u)->f & UNIF_DEBUG) { x }
83 #elif UNET_DEBUG == UNET_DEBUGRUNTIME
84 # define D(x) if (unet_debug) { x }
85 # define DIF(u, x) if ((u)->f & UNIF_DEBUG) { x }
86 #elif UNET_DEBUG == UNET_DEBUGNEVER
90 # error UNET_DEBUG set to invalid value (bug in configure script?)
93 /*----- Type definitions --------------------------------------------------*/
95 /* --- Unet connection status --- *
97 * Records are stored in a slightly strange doubly linked list. The list
98 * exists so that I can find the next unused sequence number when creating
99 * new connections. It's odd because of the type of the @prev@ node;
100 * rather than being the address of the previous item, it's the address of
101 * the previous item's pointer to me, which among other good things means
102 * that it works on the list head too.
106 struct unet *next, **prev; /* List of unet blocks */
107 struct device nif; /* Network interface block */
108 int seq; /* Sequence number for connection */
109 char name[UNET_NAMEMAX]; /* Buffer for my interface name */
110 struct wait_queue *q; /* Wait list for device reads */
111 struct sk_buff_head skbq; /* Queue of packets waiting */
112 struct enet_statistics e; /* Pointer to statistics block */
113 unsigned short protocol; /* Protocol for outgoing packets */
114 unsigned f; /* Userful flags */
117 /*----- Static variables --------------------------------------------------*/
119 #if UNET_DEBUG == UNET_DEBUGRUNTIME
120 static int unet_debug = 0;
121 MODULE_PARM(unet_debug, "i");
124 static int unet_npersist = UNET_NPERSIST;
125 static int unet_maxif = UNET_MAXIF;
126 static struct unet *unet_persistent;
127 static struct unet *unet_list = 0;
128 static int unet_nif = 0;
130 MODULE_PARM(unet_npersist, "i");
131 MODULE_PARM(unet_maxif, "i");
133 /*----- Debugging code ----------------------------------------------------*/
135 #if UNET_DEBUG != UNET_DEBUGNEVER
137 /* --- @unet_dumpBlock@ --- *
139 * Arguments: @struct unet *u@ = pointer to block to dump
143 * Use: Dumps a unet object to syslogd.
146 static void unet_dumpBlock(struct unet *u)
148 printk(KERN_DEBUG "unet: dumping unet block at %p\n", u);
149 printk(KERN_DEBUG " sequence number = %d\n", u->seq);
150 printk(KERN_DEBUG " interface name = `%s'\n", u->name);
151 printk(KERN_DEBUG " flags =%s%s%s\n",
152 u->f & UNIF_TRANS ? " TRANS" : "",
153 u->f & UNIF_OPEN ? " OPEN" : "",
154 u->f & UNIF_DEBUG ? " DEBUG" : "");
155 printk(KERN_DEBUG " interface type = %d\n", u->nif.type);
156 printk(KERN_DEBUG " header len = %d\n", u->nif.hard_header_len);
157 printk(KERN_DEBUG " mtu = %d\n", u->nif.mtu);
158 printk(KERN_DEBUG " protocol = %d\n", ntohs(u->protocol));
159 printk(KERN_DEBUG " address len = %d\n", u->nif.addr_len);
162 /* --- @unet_dump@ --- *
168 * Use: Dumps the entire unet state to syslogd.
171 static void unet_dump(void)
176 for (i = 0; i < unet_npersist; i++)
177 unet_dumpBlock(&unet_persistent[i]);
178 for (u = unet_list; u; u = u->next)
182 /* --- @unet_hexdump@ --- *
184 * Arguments: @const char *prefix@ = prefix to print on output lines
185 * @const void *b@ = pointer to block to dump
186 * @size_t sz@ = size of block to dump
190 * Use: Dumps a hex block to the kernel log.
193 #define UNET_HEXROWSZ 16
195 static void unet_hexdump(const char *prefix, const char *b, size_t sz)
197 const unsigned char *p = b;
204 /* --- Now start work --- */
208 q += sprintf(q, "%s%08lx : ", prefix, o);
209 for (i = 0; i < UNET_HEXROWSZ; i++) {
211 q += sprintf(q, "%02x ", p[i]);
213 q += sprintf(q, "** ");
215 *q++ = ':'; *q++ = ' ';
216 for (i = 0; i < UNET_HEXROWSZ; i++) {
218 *q++ = (p[i] >= 32 && p[i] < 127) ? p[i] : '.';
225 c = (sz >= UNET_HEXROWSZ) ? UNET_HEXROWSZ : sz;
226 sz -= c, p += c, o += c;
232 /*----- The unet network interfaces ---------------------------------------*/
234 /* --- @unet_ifopen@ --- *
236 * Arguments: @struct device *nif@ = pointer to network interface
238 * Returns: Zero or error condition.
240 * Use: Turns on the network interface ready for action. Oh, yes.
243 static int unet_ifopen(struct device *nif)
245 D( struct unet *u = nif->priv;
246 if (u->f & UNIF_DEBUG)
247 printk(KERN_DEBUG "unet: opening interface %s\n", u->name); )
252 /* --- @unet_ifclose@ --- *
254 * Arguments: @struct device *nif@ = pointer to network interface
256 * Returns: Zero or error condition.
258 * Use: Turns off the network interface.
261 static int unet_ifclose(struct device *nif)
263 D( struct unet *u = nif->priv;
264 if (u->f & UNIF_DEBUG)
265 printk(KERN_DEBUG "unet: closing interface %d\n", u->seq); )
270 /* --- @unet_iftx@ --- *
272 * Arguments: @struct sk_buff *skb@ = incoming network packet
273 * @struct device *nif@ = pointer to network interface
275 * Returns: Zero or error condition.
277 * Use: Queues a network packet ready for collection by the user
278 * end of the business.
281 static int unet_iftx(struct sk_buff *skb, struct device *nif)
283 struct unet *u = nif->priv;
287 printk(KERN_DEBUG "unet: packet received on if %s\n", u->name);
288 unet_hexdump(KERN_DEBUG " ", skb->data, skb->len); )
290 /* --- Discard packets when nobody's listening --- */
292 if ((u->f & UNIF_OPEN) == 0) {
293 DIF(u, printk(KERN_DEBUG "unet: dropped packet: nobody's listening\n"); )
299 /* --- Discard packets when the queue's too long --- */
301 if (u->skbq.qlen >= UNET_QMAXLEN) {
302 DIF(u, printk(KERN_DEBUG "unet: refused packet: queue overflow\n"); )
306 /* --- Attach the buffer to the waiting list --- */
309 skb_queue_tail(&u->skbq, skb);
311 DIF(u, printk(KERN_DEBUG "unet: queued packet OK\n"); )
313 /* --- If there are waiting processes, give 'em a kick --- */
316 DIF(u, printk(KERN_DEBUG "unet: waking up sleeping listeners\n"); )
317 wake_up_interruptible(&u->q);
322 /* --- @unet_ifgetstats@ --- *
324 * Arguments: @struct device *nif@ = pointer to network interface
326 * Returns: Pointer to a statistics buffer.
328 * Use: Returns a block of interface statistics.
331 static struct enet_statistics *unet_ifgetstats(struct device *nif)
333 struct unet *u = nif->priv;
334 DIF(u, printk(KERN_DEBUG "unet: stats request for if %s\n", u->name); )
338 /* --- @unet_ifinit@ --- *
340 * Arguments: @struct device *nif@ = pointer to network interface
342 * Returns: Zero or error condition.
344 * Use: Initialises a unet network interface.
347 static int unet_ifinit(struct device *nif)
349 struct unet *u = nif->priv;
351 DIF(u, printk(KERN_DEBUG "unet: initialise interface %s\n", u->name); )
353 /* --- Initialise statistics gathering --- */
355 memset(&u->e, 0, sizeof(u->e));
356 u->nif.get_stats = unet_ifgetstats;
358 /* --- Opening and closing interfaces --- */
360 u->nif.open = unet_ifopen;
361 u->nif.stop = unet_ifclose;
363 /* --- Sending packets to the `outside world' --- */
365 u->nif.hard_start_xmit = unet_iftx;
367 /* --- Some initialisation magic --- */
370 for (i = 0; i < DEV_NUMBUFFS; i++)
371 skb_queue_head_init(&u->nif.buffs[i]);
374 /* --- Configure other grotty bits of the interface --- */
376 u->nif.hard_header = 0;
377 u->nif.rebuild_header = 0;
378 u->nif.set_mac_address = 0;
380 u->nif.type = ARPHRD_LOOPBACK; /* Got a better idea? */
381 u->nif.hard_header_len = 0;
382 u->nif.mtu = 1500 - MAX_HEADER;
384 u->nif.tx_queue_len = 16; /* I keep my own queue */
386 memset(u->nif.broadcast, 0xFFu, MAX_ADDR_LEN);
388 u->nif.flags = IFF_NOARP;
390 /* --- Finished! --- */
395 /*----- Attachment management ---------------------------------------------*/
397 /* --- @unet_setup@ --- *
399 * Arguments: @struct unet *u@ = pointer to a unet block
400 * @int seq@ = sequence number to allocate
402 * Returns: Zero or error condition.
404 * Use: Initialises a unet block ready for action.
407 static int unet_setup(struct unet *u, int seq)
409 static struct device tpl;
412 D( printk(KERN_DEBUG "unet: setting up unet block %d\n", seq); )
414 /* --- A little bit of initialisation --- */
420 /* --- Inherit device debug flag from global flag --- */
422 #if UNET_DEBUG == UNET_DEBUGRUNTIME
425 #elif UNET_DEBUG == UNET_DEBUGALWAYS
429 /* --- Set up the network device --- */
432 sprintf(u->name, "unet%d", seq);
433 u->nif.name = u->name;
435 u->nif.init = unet_ifinit;
436 u->protocol = htons(ETH_P_IP);
438 if ((e = register_netdev(&u->nif)) != 0) {
439 printk(KERN_ERR "unet: couldn't register net interface\n");
443 /* --- Empty the skbuff list --- */
445 skb_queue_head_init(&u->skbq);
447 /* --- We're only finished, that's all --- */
452 /* --- @unet_flush@ --- *
454 * Arguments: @struct unet *u@ = pointer to a unet block
458 * Use: Releases all the packets waiting for transmission.
461 static void unet_flush(struct unet *u)
465 #if UNET_DEBUG != UNET_DEBUGNEVER
469 DIF(u, printk(KERN_DEBUG "unet: flushing packets on %s\n", u->name); )
471 while ((skb = skb_dequeue(&u->skbq)) != 0) {
475 DIF(u, printk(KERN_DEBUG "unet: released %d waiting packets\n", i); )
478 /* --- @unet_kill@ --- *
480 * Arguments: @struct unet *u@ = pointer to a unet block
484 * Use: Kills and decommissions a Usernet block.
487 static void unet_kill(struct unet *u)
490 unregister_netdev(&u->nif);
493 /*----- Handling the unet device ------------------------------------------*/
495 /* --- @unet_devopen@ --- *
497 * Arguments: @struct inode *ino@ = inode block to open
498 * @struct file *f@ = file block to play with
500 * Returns: Zero or error condition.
502 * Use: Handles the opening of a unet device.
505 static int unet_devopen(struct inode *ino, struct file *f)
507 struct unet *u, **up;
511 D( printk(KERN_DEBUG "unet: device open request\n"); )
513 /* --- Decide whether this is a persistent unet --- */
515 if ((seq = MINOR(ino->i_rdev)) < unet_npersist) {
516 u = &unet_persistent[seq];
517 if (u->f & UNIF_OPEN) {
521 D( printk(KERN_DEBUG "unet: opened persistent %s\n", u->name); )
524 /* --- Otherwise we've got to create a new one --- */
526 else if (seq == UNET_TRANSMINOR) {
528 /* --- Try to find a spare sequence number --- */
530 if (unet_nif >= unet_maxif) {
531 printk(KERN_NOTICE "unet: no interfaces left\n");
535 for (seq = unet_npersist, up = &unet_list; *up != 0;
536 seq++, up = &(*up)->next) {
537 if ((*up)->seq > seq)
540 D( printk(KERN_DEBUG "unet: allocated sequence number %d\n", seq); )
542 /* --- Allocate a new block --- */
544 if ((u = kmalloc(sizeof(*u), GFP_KERNEL)) == 0) {
545 printk(KERN_ERR "unet: couldn't allocate a unet block\n");
550 /* --- Initialise the block --- */
552 if ((e = unet_setup(u, seq)) != 0)
557 /* --- Link the block into the list --- */
562 (*up)->prev = &u->next;
565 D( printk(KERN_DEBUG "unet: opened transient %d\n", seq);
577 /* --- Tidy up after little disasters --- */
585 /* --- @unet_devclose@ --- *
587 * Arguments: @struct inode *ino@ = pointer to inode block
588 * @struct file *f@ = pointer to file block
592 * Use: Frees up a unet connection.
595 static int unet_devclose(struct inode *ino, struct file *f)
597 struct unet *u = f->private_data;
599 DIF(u, printk(KERN_DEBUG "unet: closing %s\n", u->name); )
601 /* --- A transient unet needs to be destroyed --- */
603 if (u->f & UNIF_TRANS) {
607 u->next->prev = u->prev;
611 D( printk(KERN_DEBUG "unet: released transient %d\n", seq); )
614 /* --- A persistent unet needs to be shutdown --- */
619 DIF(u, printk(KERN_DEBUG "unet: unblocked persistent unet\n"); )
626 /* --- @unet_devpoll@ --- *
628 * Arguments: @struct file *f@ = pointer to my file block
629 * @struct poll_table_struct *p@ = poll table to wait on
631 * Returns: Nonzero if OK to continue, zero if waiting.
633 * Use: Plays a unet device's part in a @poll@(2) call.
636 static unsigned unet_devpoll(struct file *f, struct poll_table_struct *p)
638 struct unet *u = f->private_data;
641 DIF(u, printk(KERN_DEBUG "unet: poll request for %s\n", u->name); )
643 poll_wait(f, &u->q, p);
644 if (skb_peek(&u->skbq))
645 m |= POLLIN | POLLRDNORM;
646 m |= POLLOUT | POLLWRNORM;
650 /* --- @unet_devwrite@ --- *
652 * Arguments: @struct file *f@ = pointer to the file block
653 * @char *buf@ = pointer to caller's buffer
654 * @size_t sz@ = size of data to send
655 * @loff_t *off@ = offset to set (ignored)
657 * Returns: Number of bytes written, or error condition.
659 * Use: Sends a packet of data. No buffering is done.
662 static ssize_t unet_devwrite(struct file *f, const char *buf, size_t sz,
665 struct unet *u = f->private_data;
668 DIF(u, printk(KERN_DEBUG "unet: write request for %s\n", u->name); )
670 /* --- Dump the packet we're meant to send --- */
673 if (u->f & UNIF_DEBUG) {
674 void *b = kmalloc(sz, GFP_KERNEL);
676 copy_from_user(b, buf, sz);
677 unet_hexdump(KERN_DEBUG " ", b, sz);
680 printk(KERN_NOTICE "unet: not enough memory to dump block");
684 /* --- Allocate an skbuff for the block --- */
686 if ((skb = dev_alloc_skb(sz)) == 0) {
687 printk(KERN_ERR "unet: failed to allocate skbuff\n");
692 /* --- Copy my data into the skbuff --- */
694 copy_from_user(skb_put(skb, sz), buf, sz);
696 skb->mac.raw = skb->data;
697 skb->protocol = u->protocol;
703 /* --- @unet_devread@ --- *
705 * Arguments: @struct file *f@ = pointer to the file block
706 * @char *buf@ = pointer to caller's buffer
707 * @size_t sz@ = size of caller's buffer
708 * @loff_t *off@ = offset to set (ignored)
710 * Returns: Number of bytes read, or error condition.
712 * Use: Reads the next packet waiting for the device.
715 static ssize_t unet_devread(struct file *f, char *buf, size_t sz,
718 struct unet *u = f->private_data;
721 DIF(u, printk(KERN_DEBUG "unet: read request for %s\n", u->name); )
723 /* --- Is the user sane? --- *
725 * The UDP protocol returns immediately in response to a zero-length read,
726 * and following this behaviour seems to cause `least surprise'.
732 /* --- Make sure there's a packet waiting for me --- */
734 if ((skb = skb_dequeue(&u->skbq)) == 0) {
735 struct wait_queue wq = { current, 0 };
737 DIF(u, printk(KERN_DEBUG "unet: no packets waiting\n"); )
739 /* --- Check for nonblocking I/O --- */
741 if (f->f_flags & O_NONBLOCK) {
742 DIF(u, printk(KERN_DEBUG "unet: nonblocking read: fail\n"); )
743 return (-EWOULDBLOCK);
746 /* --- Otherwise block until there's a packet --- */
748 current->state = TASK_INTERRUPTIBLE;
749 add_wait_queue(&u->q, &wq);
753 if (signal_pending(current)) {
755 DIF(u, printk(KERN_DEBUG "unet: interrupted by signal\n"); )
757 remove_wait_queue(&u->q, &wq);
758 current->state = TASK_RUNNING;
759 return (-ERESTARTSYS);
762 DIF(u, printk(KERN_DEBUG "unet: blocking until packet arrives\n"); )
766 } while ((skb = skb_dequeue(&u->skbq)) == 0);
768 remove_wait_queue(&u->q, &wq);
769 current->state = TASK_RUNNING;
772 DIF(u, printk(KERN_DEBUG "unet: found a packet\n"); )
774 /* --- There is now a packet waiting --- */
778 copy_to_user(buf, skb->data, sz);
781 DIF(u, printk(KERN_DEBUG "unet: passed packet on to user\n"); )
786 /* --- @unet_devioctl@ --- *
788 * Arguments: @struct inode *ino@ = pointer to inode block
789 * @struct file *f@ = pointer to file block
790 * @unsigned int c@ = command code to execute
791 * @unsigned long arg@ = argument passed to me
793 * Returns: Positive return value, or negative error condition.
795 * Use: Performs miscellaneous operations on a unet device.
798 static int unet_devioctl(struct inode *ino,
803 struct unet *u = f->private_data;
806 DIF(u, printk(KERN_DEBUG "unet: ioctl request for %s\n", u->name); )
810 /* --- @FIONREAD@ --- *
812 * Caller wants to know how big the next packet will be. Don't
817 struct sk_buff *skb = skb_peek(&u->skbq);
819 DIF(u, printk(KERN_DEBUG "unet: FIONREAD found %d bytes\n",
820 skb ? skb->len : 0); )
826 /* --- @UNIOCGINFO@ --- *
828 * Caller wants information about me.
832 struct unet_info uni, *unip;
834 DIF(u, printk(KERN_DEBUG "unet: UNIOCGINFO called\n"); )
836 unip = (struct unet_info *)arg;
838 /* --- Special case --- *
840 * If the pointer is null, this call means `are you there?' and can
841 * be used to check for a Usernet attachment.
847 /* --- Ensure that the area can be written to --- */
849 if ((e = verify_area(VERIFY_WRITE, unip, sizeof(*unip))) != 0)
852 /* --- Build the information block in memory --- */
854 memset(&uni, 0, sizeof(uni)); /* Paranoia */
855 strncpy(uni.uni_ifname, u->name, UNET_NAMEMAX);
856 uni.uni_mtu = u->nif.mtu;
857 uni.uni_family = AF_INET;
858 uni.uni_proto = ntohs(u->protocol);
859 uni.uni_flags = u->f;
861 /* --- Copy it to the user and return --- */
863 copy_to_user(unip, &uni, sizeof(uni));
866 /* --- @UNIOCSDEBUG@ --- */
868 #if UNET_DEBUG != UNET_DEBUGNEVER
871 int o = !!(u->f & UNIF_DEBUG);
873 if (!capable(CAP_SYS_ADMIN))
876 printk(KERN_DEBUG "unet: UNIOCSDEBUG on %s: %s\n", u->name,
877 (o && n) ? "debugging still on" :
878 (!o && n) ? "debugging turned on" :
879 (o && !n) ? "debugging turned off" :
880 (!o && !n) ? "you can't see this message" :
881 "Logic failure: universe exploding");
890 /* --- @UNIOCGPROTO@ and @UNIOCSPROTO@ --- */
893 D( printk(KERN_DEBUG "unet: UNIOCGPROTO on %s: read protocol: %d\n",
894 u->name, ntohs(u->protocol)); )
895 e = ntohs(u->protocol);
898 D( printk(KERN_DEBUG "unet: UNIOCSPROTO on %s: set protocol: %d\n",
899 u->name, (int)arg); )
900 u->protocol = htons(arg);
903 /* --- @UNIOCGGDEBUG@ and @UNIOCSGDEBUG@ --- */
906 D( printk(KERN_DEBUG "unet: UNIOCGGDEBUG: get global debug: on\n"); )
907 #if UNET_DEBUG == UNET_DEBUGRUNTIME
909 #elif UNET_DEBUG == UNET_DEBUGALWAYS
911 #elif UNET_DEBUG == UNET_DEBUGNEVER
916 #if UNET_DEBUG == UNET_DEBUGRUNTIME
918 if (!capable(CAP_SYS_ADMIN))
920 if (arg || unet_debug) {
921 printk(KERN_DEBUG "unet: UNIOCSGDEBUG: set global debug: %s\n",
922 (arg && unet_debug) ? "debugging still on" :
923 (!arg && unet_debug) ? "debugging turned off" :
924 (arg && !unet_debug) ? "debugging turned on" :
925 (!arg && !unet_debug) ? "you can't see this message" :
926 "Logic failure: universe exploding");
932 /* --- @UNIOCDUMP@ --- */
934 #if UNET_DEBUG != UNET_DEBUGNEVER
936 D( unet_dumpBlock(u); )
940 /* --- @UNIOCGMAXIF@ --- */
943 D( printk(KERN_DEBUG "unet: UNIOCGMAXIF: unet_maxif = %d\n",
948 /* --- @UNIOCSMAXIF@ --- */
951 if (!capable(CAP_SYS_ADMIN))
953 D( printk(KERN_DEBUG "unet: UNIOCSMAXIF: "
954 "arg = %ld; npersist = %d; nif = %d\n",
955 arg, unet_npersist, unet_nif); )
956 if (arg < unet_npersist || arg > INT_MAX)
962 D( printk(KERN_DEBUG "unet: UNIOCSMAXIF: set unet_maxif = %d\n",
966 /* --- Everything else --- *
972 D( printk(KERN_DEBUG "unet: unknown ioctl %08x\n", c); )
979 /*----- The unet device ---------------------------------------------------*/
981 /* --- Device operations --- */
983 struct file_operations unet_fops = {
984 0, /* unet_devlseek */
987 0, /* unet_devreaddir */
990 0, /* unet_devmmap */
996 /*----- Initaliseation and shutdown ---------------------------------------*/
998 /* --- @unet_init@ --- *
1002 * Returns: Zero or error condition.
1004 * Use: Registers the unet device.
1007 __initfunc(int unet_init(void))
1012 /* --- Register my character device --- */
1014 if ((e = register_chrdev(UNET_MAJOR, "unet", &unet_fops)) != 0) {
1015 printk(KERN_ERR "unet: can't claim major device %d\n", UNET_MAJOR);
1019 /* --- Make the persistent unet devices --- */
1021 if ((unet_persistent = kmalloc(unet_npersist * sizeof(struct unet),
1022 GFP_KERNEL)) == 0) {
1023 printk(KERN_ERR "unet: can't allocate %i persistent unet blocks",
1029 for (i = 0; i < unet_npersist; i++) {
1030 if ((e = unet_setup(&unet_persistent[i], i)) != 0) {
1031 printk(KERN_ERR "unet: can't create persistent unet %d\n", i);
1035 unet_nif = unet_npersist;
1042 /* --- Some bad stuff happened --- */
1047 unregister_netdev(&unet_persistent[i].nif);
1049 kfree(unet_persistent);
1052 unregister_chrdev(UNET_MAJOR, "unet");
1060 /* --- @init_module@ --- *
1064 * Returns: Zero or error condition.
1066 * Use: Initialises the unet kernel module.
1069 int init_module(void)
1071 if (unet_npersist < 0 || unet_maxif < unet_npersist
1072 #if UNET_DEBUG == UNET_DEBUGRUNTIME
1073 || (unet_debug != 0 && unet_debug != 1)
1077 return (unet_init());
1080 /* --- @cleanup_module@ --- *
1086 * Use: Tidies up the unet module ready for it to be killed.
1089 void cleanup_module(void)
1093 for (i = 0; i < unet_npersist; i++) {
1094 D( printk(KERN_DEBUG "unet: releasing persistent unet %d\n", i); )
1095 unet_kill(&unet_persistent[i]);
1097 kfree(unet_persistent);
1099 unregister_chrdev(UNET_MAJOR, "unet");
1104 /*----- That's all, folks -------------------------------------------------*/