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-rw-r--r--drivers/net/hamradio/mkiss.c1086
1 files changed, 524 insertions, 562 deletions
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 3035422f5ad8..63b1a2b86acb 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -1,30 +1,19 @@
1/* 1/*
2 * MKISS Driver 2 * This program is free software; you can distribute it and/or modify it
3 * under the terms of the GNU General Public License (Version 2) as
4 * published by the Free Software Foundation.
3 * 5 *
4 * This module: 6 * This program is distributed in the hope it will be useful, but WITHOUT
5 * This module is free software; you can redistribute it and/or 7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
6 * modify it under the terms of the GNU General Public License 8 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
7 * as published by the Free Software Foundation; either version 9 * for more details.
8 * 2 of the License, or (at your option) any later version.
9 * 10 *
10 * This module implements the AX.25 protocol for kernel-based 11 * You should have received a copy of the GNU General Public License along
11 * devices like TTYs. It interfaces between a raw TTY, and the 12 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * kernel's AX.25 protocol layers, just like slip.c. 13 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
13 * AX.25 needs to be separated from slip.c while slip.c is no
14 * longer a static kernel device since it is a module.
15 * This method clears the way to implement other kiss protocols
16 * like mkiss smack g8bpq ..... so far only mkiss is implemented.
17 * 14 *
18 * Hans Alblas <hans@esrac.ele.tue.nl> 15 * Copyright (C) Hans Alblas PE1AYX <hans@esrac.ele.tue.nl>
19 * 16 * Copyright (C) 2004, 05 Ralf Baechle DL5RB <ralf@linux-mips.org>
20 * History
21 * Jonathan (G4KLX) Fixed to match Linux networking changes - 2.1.15.
22 * Matthias (DG2FEF) Added support for FlexNet CRC (on special request)
23 * Fixed bug in ax25_close(): dev_lock_wait() was
24 * called twice, causing a deadlock.
25 * Jeroen (PE1RXQ) Removed old MKISS_MAGIC stuff and calls to
26 * MOD_*_USE_COUNT
27 * Remove cli() and fix rtnl lock usage.
28 */ 17 */
29 18
30#include <linux/config.h> 19#include <linux/config.h>
@@ -46,177 +35,300 @@
46#include <linux/etherdevice.h> 35#include <linux/etherdevice.h>
47#include <linux/skbuff.h> 36#include <linux/skbuff.h>
48#include <linux/if_arp.h> 37#include <linux/if_arp.h>
38#include <linux/jiffies.h>
49 39
50#include <net/ax25.h> 40#include <net/ax25.h>
51 41
52#include "mkiss.h"
53
54#ifdef CONFIG_INET 42#ifdef CONFIG_INET
55#include <linux/ip.h> 43#include <linux/ip.h>
56#include <linux/tcp.h> 44#include <linux/tcp.h>
57#endif 45#endif
58 46
59static char banner[] __initdata = KERN_INFO "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n"; 47#define AX_MTU 236
60 48
61typedef struct ax25_ctrl { 49/* SLIP/KISS protocol characters. */
62 struct ax_disp ctrl; /* */ 50#define END 0300 /* indicates end of frame */
63 struct net_device dev; /* the device */ 51#define ESC 0333 /* indicates byte stuffing */
64} ax25_ctrl_t; 52#define ESC_END 0334 /* ESC ESC_END means END 'data' */
65 53#define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */
66static ax25_ctrl_t **ax25_ctrls; 54
67 55struct mkiss {
68int ax25_maxdev = AX25_MAXDEV; /* Can be overridden with insmod! */ 56 struct tty_struct *tty; /* ptr to TTY structure */
69 57 struct net_device *dev; /* easy for intr handling */
70static struct tty_ldisc ax_ldisc; 58
71 59 /* These are pointers to the malloc()ed frame buffers. */
72static int ax25_init(struct net_device *); 60 spinlock_t buflock;/* lock for rbuf and xbuf */
73static int kiss_esc(unsigned char *, unsigned char *, int); 61 unsigned char *rbuff; /* receiver buffer */
74static int kiss_esc_crc(unsigned char *, unsigned char *, unsigned short, int); 62 int rcount; /* received chars counter */
75static void kiss_unesc(struct ax_disp *, unsigned char); 63 unsigned char *xbuff; /* transmitter buffer */
64 unsigned char *xhead; /* pointer to next byte to XMIT */
65 int xleft; /* bytes left in XMIT queue */
66
67 struct net_device_stats stats;
68
69 /* Detailed SLIP statistics. */
70 int mtu; /* Our mtu (to spot changes!) */
71 int buffsize; /* Max buffers sizes */
72
73 unsigned long flags; /* Flag values/ mode etc */
74 /* long req'd: used by set_bit --RR */
75#define AXF_INUSE 0 /* Channel in use */
76#define AXF_ESCAPE 1 /* ESC received */
77#define AXF_ERROR 2 /* Parity, etc. error */
78#define AXF_KEEPTEST 3 /* Keepalive test flag */
79#define AXF_OUTWAIT 4 /* is outpacket was flag */
80
81 int mode;
82 int crcmode; /* MW: for FlexNet, SMACK etc. */
83#define CRC_MODE_NONE 0
84#define CRC_MODE_FLEX 1
85#define CRC_MODE_SMACK 2
86
87 atomic_t refcnt;
88 struct semaphore dead_sem;
89};
76 90
77/*---------------------------------------------------------------------------*/ 91/*---------------------------------------------------------------------------*/
78 92
79static const unsigned short Crc_flex_table[] = { 93static const unsigned short crc_flex_table[] = {
80 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38, 94 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38,
81 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770, 95 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770,
82 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9, 96 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9,
83 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1, 97 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1,
84 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a, 98 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a,
85 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672, 99 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672,
86 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb, 100 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb,
87 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3, 101 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3,
88 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c, 102 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c,
89 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574, 103 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574,
90 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd, 104 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd,
91 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5, 105 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5,
92 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e, 106 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e,
93 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476, 107 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476,
94 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf, 108 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf,
95 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7, 109 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7,
96 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30, 110 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30,
97 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378, 111 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378,
98 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1, 112 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1,
99 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9, 113 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9,
100 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32, 114 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32,
101 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a, 115 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a,
102 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3, 116 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3,
103 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb, 117 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb,
104 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34, 118 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34,
105 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c, 119 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c,
106 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5, 120 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5,
107 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd, 121 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd,
108 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36, 122 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36,
109 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e, 123 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e,
110 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7, 124 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7,
111 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff 125 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff
112}; 126};
113 127
114/*---------------------------------------------------------------------------*/
115
116static unsigned short calc_crc_flex(unsigned char *cp, int size) 128static unsigned short calc_crc_flex(unsigned char *cp, int size)
117{ 129{
118 unsigned short crc = 0xffff; 130 unsigned short crc = 0xffff;
119
120 while (size--)
121 crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
122 131
123 return crc; 132 while (size--)
124} 133 crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
125 134
126/*---------------------------------------------------------------------------*/ 135 return crc;
136}
127 137
128static int check_crc_flex(unsigned char *cp, int size) 138static int check_crc_flex(unsigned char *cp, int size)
129{ 139{
130 unsigned short crc = 0xffff; 140 unsigned short crc = 0xffff;
131 141
132 if (size < 3) 142 if (size < 3)
133 return -1; 143 return -1;
134 144
135 while (size--) 145 while (size--)
136 crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; 146 crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
137 147
138 if ((crc & 0xffff) != 0x7070) 148 if ((crc & 0xffff) != 0x7070)
139 return -1; 149 return -1;
140 150
141 return 0; 151 return 0;
142} 152}
143 153
144/*---------------------------------------------------------------------------*/ 154/*
155 * Standard encapsulation
156 */
145 157
146/* Find a free channel, and link in this `tty' line. */ 158static int kiss_esc(unsigned char *s, unsigned char *d, int len)
147static inline struct ax_disp *ax_alloc(void)
148{ 159{
149 ax25_ctrl_t *axp=NULL; 160 unsigned char *ptr = d;
150 int i; 161 unsigned char c;
151 162
152 for (i = 0; i < ax25_maxdev; i++) { 163 /*
153 axp = ax25_ctrls[i]; 164 * Send an initial END character to flush out any data that may have
165 * accumulated in the receiver due to line noise.
166 */
154 167
155 /* Not allocated ? */ 168 *ptr++ = END;
156 if (axp == NULL)
157 break;
158 169
159 /* Not in use ? */ 170 while (len-- > 0) {
160 if (!test_and_set_bit(AXF_INUSE, &axp->ctrl.flags)) 171 switch (c = *s++) {
172 case END:
173 *ptr++ = ESC;
174 *ptr++ = ESC_END;
161 break; 175 break;
176 case ESC:
177 *ptr++ = ESC;
178 *ptr++ = ESC_ESC;
179 break;
180 default:
181 *ptr++ = c;
182 break;
183 }
162 } 184 }
163 185
164 /* Sorry, too many, all slots in use */ 186 *ptr++ = END;
165 if (i >= ax25_maxdev) 187
166 return NULL; 188 return ptr - d;
189}
190
191/*
192 * MW:
193 * OK its ugly, but tell me a better solution without copying the
194 * packet to a temporary buffer :-)
195 */
196static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc,
197 int len)
198{
199 unsigned char *ptr = d;
200 unsigned char c=0;
201
202 *ptr++ = END;
203 while (len > 0) {
204 if (len > 2)
205 c = *s++;
206 else if (len > 1)
207 c = crc >> 8;
208 else if (len > 0)
209 c = crc & 0xff;
210
211 len--;
167 212
168 /* If no channels are available, allocate one */ 213 switch (c) {
169 if (axp == NULL && (ax25_ctrls[i] = kmalloc(sizeof(ax25_ctrl_t), GFP_KERNEL)) != NULL) { 214 case END:
170 axp = ax25_ctrls[i]; 215 *ptr++ = ESC;
216 *ptr++ = ESC_END;
217 break;
218 case ESC:
219 *ptr++ = ESC;
220 *ptr++ = ESC_ESC;
221 break;
222 default:
223 *ptr++ = c;
224 break;
225 }
171 } 226 }
172 memset(axp, 0, sizeof(ax25_ctrl_t)); 227 *ptr++ = END;
173 228
174 /* Initialize channel control data */ 229 return ptr - d;
175 set_bit(AXF_INUSE, &axp->ctrl.flags); 230}
176 sprintf(axp->dev.name, "ax%d", i++); 231
177 axp->ctrl.tty = NULL; 232/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */
178 axp->dev.base_addr = i; 233static void ax_bump(struct mkiss *ax)
179 axp->dev.priv = (void *)&axp->ctrl; 234{
180 axp->dev.next = NULL; 235 struct sk_buff *skb;
181 axp->dev.init = ax25_init; 236 int count;
182 237
183 if (axp != NULL) { 238 spin_lock_bh(&ax->buflock);
184 /* 239 if (ax->rbuff[0] > 0x0f) {
185 * register device so that it can be ifconfig'ed 240 if (ax->rbuff[0] & 0x20) {
186 * ax25_init() will be called as a side-effect 241 ax->crcmode = CRC_MODE_FLEX;
187 * SIDE-EFFECT WARNING: ax25_init() CLEARS axp->ctrl ! 242 if (check_crc_flex(ax->rbuff, ax->rcount) < 0) {
188 */ 243 ax->stats.rx_errors++;
189 if (register_netdev(&axp->dev) == 0) { 244 return;
190 /* (Re-)Set the INUSE bit. Very Important! */ 245 }
191 set_bit(AXF_INUSE, &axp->ctrl.flags); 246 ax->rcount -= 2;
192 axp->ctrl.dev = &axp->dev; 247 /* dl9sau bugfix: the trailling two bytes flexnet crc
193 axp->dev.priv = (void *) &axp->ctrl; 248 * will not be passed to the kernel. thus we have
194 249 * to correct the kissparm signature, because it
195 return &axp->ctrl; 250 * indicates a crc but there's none
196 } else { 251 */
197 clear_bit(AXF_INUSE,&axp->ctrl.flags); 252 *ax->rbuff &= ~0x20;
198 printk(KERN_ERR "mkiss: ax_alloc() - register_netdev() failure.\n");
199 } 253 }
254 }
255 spin_unlock_bh(&ax->buflock);
256
257 count = ax->rcount;
258
259 if ((skb = dev_alloc_skb(count)) == NULL) {
260 printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n",
261 ax->dev->name);
262 ax->stats.rx_dropped++;
263 return;
200 } 264 }
201 265
202 return NULL; 266 spin_lock_bh(&ax->buflock);
267 memcpy(skb_put(skb,count), ax->rbuff, count);
268 spin_unlock_bh(&ax->buflock);
269 skb->protocol = ax25_type_trans(skb, ax->dev);
270 netif_rx(skb);
271 ax->dev->last_rx = jiffies;
272 ax->stats.rx_packets++;
273 ax->stats.rx_bytes += count;
203} 274}
204 275
205/* Free an AX25 channel. */ 276static void kiss_unesc(struct mkiss *ax, unsigned char s)
206static inline void ax_free(struct ax_disp *ax)
207{ 277{
208 /* Free all AX25 frame buffers. */ 278 switch (s) {
209 if (ax->rbuff) 279 case END:
210 kfree(ax->rbuff); 280 /* drop keeptest bit = VSV */
211 ax->rbuff = NULL; 281 if (test_bit(AXF_KEEPTEST, &ax->flags))
212 if (ax->xbuff) 282 clear_bit(AXF_KEEPTEST, &ax->flags);
213 kfree(ax->xbuff); 283
214 ax->xbuff = NULL; 284 if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2))
215 if (!test_and_clear_bit(AXF_INUSE, &ax->flags)) 285 ax_bump(ax);
216 printk(KERN_ERR "mkiss: %s: ax_free for already free unit.\n", ax->dev->name); 286
287 clear_bit(AXF_ESCAPE, &ax->flags);
288 ax->rcount = 0;
289 return;
290
291 case ESC:
292 set_bit(AXF_ESCAPE, &ax->flags);
293 return;
294 case ESC_ESC:
295 if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
296 s = ESC;
297 break;
298 case ESC_END:
299 if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
300 s = END;
301 break;
302 }
303
304 spin_lock_bh(&ax->buflock);
305 if (!test_bit(AXF_ERROR, &ax->flags)) {
306 if (ax->rcount < ax->buffsize) {
307 ax->rbuff[ax->rcount++] = s;
308 spin_unlock_bh(&ax->buflock);
309 return;
310 }
311
312 ax->stats.rx_over_errors++;
313 set_bit(AXF_ERROR, &ax->flags);
314 }
315 spin_unlock_bh(&ax->buflock);
316}
317
318static int ax_set_mac_address(struct net_device *dev, void *addr)
319{
320 struct sockaddr_ax25 *sa = addr;
321
322 spin_lock_irq(&dev->xmit_lock);
323 memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN);
324 spin_unlock_irq(&dev->xmit_lock);
325
326 return 0;
217} 327}
218 328
219static void ax_changedmtu(struct ax_disp *ax) 329/*---------------------------------------------------------------------------*/
330
331static void ax_changedmtu(struct mkiss *ax)
220{ 332{
221 struct net_device *dev = ax->dev; 333 struct net_device *dev = ax->dev;
222 unsigned char *xbuff, *rbuff, *oxbuff, *orbuff; 334 unsigned char *xbuff, *rbuff, *oxbuff, *orbuff;
@@ -236,7 +348,8 @@ static void ax_changedmtu(struct ax_disp *ax)
236 rbuff = kmalloc(len + 4, GFP_ATOMIC); 348 rbuff = kmalloc(len + 4, GFP_ATOMIC);
237 349
238 if (xbuff == NULL || rbuff == NULL) { 350 if (xbuff == NULL || rbuff == NULL) {
239 printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, MTU change cancelled.\n", 351 printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, "
352 "MTU change cancelled.\n",
240 ax->dev->name); 353 ax->dev->name);
241 dev->mtu = ax->mtu; 354 dev->mtu = ax->mtu;
242 if (xbuff != NULL) 355 if (xbuff != NULL)
@@ -258,7 +371,7 @@ static void ax_changedmtu(struct ax_disp *ax)
258 memcpy(ax->xbuff, ax->xhead, ax->xleft); 371 memcpy(ax->xbuff, ax->xhead, ax->xleft);
259 } else { 372 } else {
260 ax->xleft = 0; 373 ax->xleft = 0;
261 ax->tx_dropped++; 374 ax->stats.tx_dropped++;
262 } 375 }
263 } 376 }
264 377
@@ -269,7 +382,7 @@ static void ax_changedmtu(struct ax_disp *ax)
269 memcpy(ax->rbuff, orbuff, ax->rcount); 382 memcpy(ax->rbuff, orbuff, ax->rcount);
270 } else { 383 } else {
271 ax->rcount = 0; 384 ax->rcount = 0;
272 ax->rx_over_errors++; 385 ax->stats.rx_over_errors++;
273 set_bit(AXF_ERROR, &ax->flags); 386 set_bit(AXF_ERROR, &ax->flags);
274 } 387 }
275 } 388 }
@@ -279,72 +392,14 @@ static void ax_changedmtu(struct ax_disp *ax)
279 392
280 spin_unlock_bh(&ax->buflock); 393 spin_unlock_bh(&ax->buflock);
281 394
282 if (oxbuff != NULL) 395 kfree(oxbuff);
283 kfree(oxbuff); 396 kfree(orbuff);
284 if (orbuff != NULL)
285 kfree(orbuff);
286}
287
288
289/* Set the "sending" flag. This must be atomic. */
290static inline void ax_lock(struct ax_disp *ax)
291{
292 netif_stop_queue(ax->dev);
293}
294
295
296/* Clear the "sending" flag. This must be atomic. */
297static inline void ax_unlock(struct ax_disp *ax)
298{
299 netif_start_queue(ax->dev);
300}
301
302/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */
303static void ax_bump(struct ax_disp *ax)
304{
305 struct sk_buff *skb;
306 int count;
307
308 spin_lock_bh(&ax->buflock);
309 if (ax->rbuff[0] > 0x0f) {
310 if (ax->rbuff[0] & 0x20) {
311 ax->crcmode = CRC_MODE_FLEX;
312 if (check_crc_flex(ax->rbuff, ax->rcount) < 0) {
313 ax->rx_errors++;
314 return;
315 }
316 ax->rcount -= 2;
317 /* dl9sau bugfix: the trailling two bytes flexnet crc
318 * will not be passed to the kernel. thus we have
319 * to correct the kissparm signature, because it
320 * indicates a crc but there's none
321 */
322 *ax->rbuff &= ~0x20;
323 }
324 }
325 spin_unlock_bh(&ax->buflock);
326
327 count = ax->rcount;
328
329 if ((skb = dev_alloc_skb(count)) == NULL) {
330 printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", ax->dev->name);
331 ax->rx_dropped++;
332 return;
333 }
334
335 spin_lock_bh(&ax->buflock);
336 memcpy(skb_put(skb,count), ax->rbuff, count);
337 spin_unlock_bh(&ax->buflock);
338 skb->protocol = ax25_type_trans(skb, ax->dev);
339 netif_rx(skb);
340 ax->dev->last_rx = jiffies;
341 ax->rx_packets++;
342 ax->rx_bytes+=count;
343} 397}
344 398
345/* Encapsulate one AX.25 packet and stuff into a TTY queue. */ 399/* Encapsulate one AX.25 packet and stuff into a TTY queue. */
346static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len) 400static void ax_encaps(struct net_device *dev, unsigned char *icp, int len)
347{ 401{
402 struct mkiss *ax = netdev_priv(dev);
348 unsigned char *p; 403 unsigned char *p;
349 int actual, count; 404 int actual, count;
350 405
@@ -354,8 +409,8 @@ static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len)
354 if (len > ax->mtu) { /* Sigh, shouldn't occur BUT ... */ 409 if (len > ax->mtu) { /* Sigh, shouldn't occur BUT ... */
355 len = ax->mtu; 410 len = ax->mtu;
356 printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name); 411 printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name);
357 ax->tx_dropped++; 412 ax->stats.tx_dropped++;
358 ax_unlock(ax); 413 netif_start_queue(dev);
359 return; 414 return;
360 } 415 }
361 416
@@ -376,10 +431,11 @@ static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len)
376 break; 431 break;
377 } 432 }
378 433
379 ax->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); 434 set_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags);
380 actual = ax->tty->driver->write(ax->tty, ax->xbuff, count); 435 actual = ax->tty->driver->write(ax->tty, ax->xbuff, count);
381 ax->tx_packets++; 436 ax->stats.tx_packets++;
382 ax->tx_bytes+=actual; 437 ax->stats.tx_bytes += actual;
438
383 ax->dev->trans_start = jiffies; 439 ax->dev->trans_start = jiffies;
384 ax->xleft = count - actual; 440 ax->xleft = count - actual;
385 ax->xhead = ax->xbuff + actual; 441 ax->xhead = ax->xbuff + actual;
@@ -387,37 +443,10 @@ static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len)
387 spin_unlock_bh(&ax->buflock); 443 spin_unlock_bh(&ax->buflock);
388} 444}
389 445
390/*
391 * Called by the driver when there's room for more data. If we have
392 * more packets to send, we send them here.
393 */
394static void ax25_write_wakeup(struct tty_struct *tty)
395{
396 int actual;
397 struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
398
399 /* First make sure we're connected. */
400 if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev))
401 return;
402 if (ax->xleft <= 0) {
403 /* Now serial buffer is almost free & we can start
404 * transmission of another packet
405 */
406 tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
407
408 netif_wake_queue(ax->dev);
409 return;
410 }
411
412 actual = tty->driver->write(tty, ax->xhead, ax->xleft);
413 ax->xleft -= actual;
414 ax->xhead += actual;
415}
416
417/* Encapsulate an AX.25 packet and kick it into a TTY queue. */ 446/* Encapsulate an AX.25 packet and kick it into a TTY queue. */
418static int ax_xmit(struct sk_buff *skb, struct net_device *dev) 447static int ax_xmit(struct sk_buff *skb, struct net_device *dev)
419{ 448{
420 struct ax_disp *ax = netdev_priv(dev); 449 struct mkiss *ax = netdev_priv(dev);
421 450
422 if (!netif_running(dev)) { 451 if (!netif_running(dev)) {
423 printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name); 452 printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name);
@@ -429,7 +458,7 @@ static int ax_xmit(struct sk_buff *skb, struct net_device *dev)
429 * May be we must check transmitter timeout here ? 458 * May be we must check transmitter timeout here ?
430 * 14 Oct 1994 Dmitry Gorodchanin. 459 * 14 Oct 1994 Dmitry Gorodchanin.
431 */ 460 */
432 if (jiffies - dev->trans_start < 20 * HZ) { 461 if (time_before(jiffies, dev->trans_start + 20 * HZ)) {
433 /* 20 sec timeout not reached */ 462 /* 20 sec timeout not reached */
434 return 1; 463 return 1;
435 } 464 }
@@ -439,20 +468,30 @@ static int ax_xmit(struct sk_buff *skb, struct net_device *dev)
439 "bad line quality" : "driver error"); 468 "bad line quality" : "driver error");
440 469
441 ax->xleft = 0; 470 ax->xleft = 0;
442 ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); 471 clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags);
443 ax_unlock(ax); 472 netif_start_queue(dev);
444 } 473 }
445 474
446 /* We were not busy, so we are now... :-) */ 475 /* We were not busy, so we are now... :-) */
447 if (skb != NULL) { 476 if (skb != NULL) {
448 ax_lock(ax); 477 netif_stop_queue(dev);
449 ax_encaps(ax, skb->data, skb->len); 478 ax_encaps(dev, skb->data, skb->len);
450 kfree_skb(skb); 479 kfree_skb(skb);
451 } 480 }
452 481
453 return 0; 482 return 0;
454} 483}
455 484
485static int ax_open_dev(struct net_device *dev)
486{
487 struct mkiss *ax = netdev_priv(dev);
488
489 if (ax->tty == NULL)
490 return -ENODEV;
491
492 return 0;
493}
494
456#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 495#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
457 496
458/* Return the frame type ID */ 497/* Return the frame type ID */
@@ -481,7 +520,7 @@ static int ax_rebuild_header(struct sk_buff *skb)
481/* Open the low-level part of the AX25 channel. Easy! */ 520/* Open the low-level part of the AX25 channel. Easy! */
482static int ax_open(struct net_device *dev) 521static int ax_open(struct net_device *dev)
483{ 522{
484 struct ax_disp *ax = netdev_priv(dev); 523 struct mkiss *ax = netdev_priv(dev);
485 unsigned long len; 524 unsigned long len;
486 525
487 if (ax->tty == NULL) 526 if (ax->tty == NULL)
@@ -518,7 +557,6 @@ static int ax_open(struct net_device *dev)
518 557
519 spin_lock_init(&ax->buflock); 558 spin_lock_init(&ax->buflock);
520 559
521 netif_start_queue(dev);
522 return 0; 560 return 0;
523 561
524noxbuff: 562noxbuff:
@@ -532,68 +570,100 @@ norbuff:
532/* Close the low-level part of the AX25 channel. Easy! */ 570/* Close the low-level part of the AX25 channel. Easy! */
533static int ax_close(struct net_device *dev) 571static int ax_close(struct net_device *dev)
534{ 572{
535 struct ax_disp *ax = netdev_priv(dev); 573 struct mkiss *ax = netdev_priv(dev);
536 574
537 if (ax->tty == NULL) 575 if (ax->tty)
538 return -EBUSY; 576 clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags);
539
540 ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
541 577
542 netif_stop_queue(dev); 578 netif_stop_queue(dev);
543 579
544 return 0; 580 return 0;
545} 581}
546 582
547static int ax25_receive_room(struct tty_struct *tty) 583static struct net_device_stats *ax_get_stats(struct net_device *dev)
548{ 584{
549 return 65536; /* We can handle an infinite amount of data. :-) */ 585 struct mkiss *ax = netdev_priv(dev);
586
587 return &ax->stats;
588}
589
590static void ax_setup(struct net_device *dev)
591{
592 static char ax25_bcast[AX25_ADDR_LEN] =
593 {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1};
594 static char ax25_test[AX25_ADDR_LEN] =
595 {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1};
596
597 /* Finish setting up the DEVICE info. */
598 dev->mtu = AX_MTU;
599 dev->hard_start_xmit = ax_xmit;
600 dev->open = ax_open_dev;
601 dev->stop = ax_close;
602 dev->get_stats = ax_get_stats;
603 dev->set_mac_address = ax_set_mac_address;
604 dev->hard_header_len = 0;
605 dev->addr_len = 0;
606 dev->type = ARPHRD_AX25;
607 dev->tx_queue_len = 10;
608 dev->hard_header = ax_header;
609 dev->rebuild_header = ax_rebuild_header;
610
611 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
612 memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN);
613
614 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
550} 615}
551 616
552/* 617/*
553 * Handle the 'receiver data ready' interrupt. 618 * We have a potential race on dereferencing tty->disc_data, because the tty
554 * This function is called by the 'tty_io' module in the kernel when 619 * layer provides no locking at all - thus one cpu could be running
555 * a block of data has been received, which can now be decapsulated 620 * sixpack_receive_buf while another calls sixpack_close, which zeroes
556 * and sent on to the AX.25 layer for further processing. 621 * tty->disc_data and frees the memory that sixpack_receive_buf is using. The
622 * best way to fix this is to use a rwlock in the tty struct, but for now we
623 * use a single global rwlock for all ttys in ppp line discipline.
557 */ 624 */
558static void ax25_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) 625static rwlock_t disc_data_lock = RW_LOCK_UNLOCKED;
626
627static struct mkiss *mkiss_get(struct tty_struct *tty)
559{ 628{
560 struct ax_disp *ax = (struct ax_disp *) tty->disc_data; 629 struct mkiss *ax;
561 630
562 if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev)) 631 read_lock(&disc_data_lock);
563 return; 632 ax = tty->disc_data;
633 if (ax)
634 atomic_inc(&ax->refcnt);
635 read_unlock(&disc_data_lock);
564 636
565 /* 637 return ax;
566 * Argh! mtu change time! - costs us the packet part received 638}
567 * at the change
568 */
569 if (ax->mtu != ax->dev->mtu + 73)
570 ax_changedmtu(ax);
571
572 /* Read the characters out of the buffer */
573 while (count--) {
574 if (fp != NULL && *fp++) {
575 if (!test_and_set_bit(AXF_ERROR, &ax->flags))
576 ax->rx_errors++;
577 cp++;
578 continue;
579 }
580 639
581 kiss_unesc(ax, *cp++); 640static void mkiss_put(struct mkiss *ax)
582 } 641{
642 if (atomic_dec_and_test(&ax->refcnt))
643 up(&ax->dead_sem);
583} 644}
584 645
585static int ax25_open(struct tty_struct *tty) 646static int mkiss_open(struct tty_struct *tty)
586{ 647{
587 struct ax_disp *ax = (struct ax_disp *) tty->disc_data; 648 struct net_device *dev;
649 struct mkiss *ax;
588 int err; 650 int err;
589 651
590 /* First make sure we're not already connected. */ 652 if (!capable(CAP_NET_ADMIN))
591 if (ax && ax->magic == AX25_MAGIC) 653 return -EPERM;
592 return -EEXIST;
593 654
594 /* OK. Find a free AX25 channel to use. */ 655 dev = alloc_netdev(sizeof(struct mkiss), "ax%d", ax_setup);
595 if ((ax = ax_alloc()) == NULL) 656 if (!dev) {
596 return -ENFILE; 657 err = -ENOMEM;
658 goto out;
659 }
660
661 ax = netdev_priv(dev);
662 ax->dev = dev;
663
664 spin_lock_init(&ax->buflock);
665 atomic_set(&ax->refcnt, 1);
666 init_MUTEX_LOCKED(&ax->dead_sem);
597 667
598 ax->tty = tty; 668 ax->tty = tty;
599 tty->disc_data = ax; 669 tty->disc_data = ax;
@@ -602,283 +672,212 @@ static int ax25_open(struct tty_struct *tty)
602 tty->driver->flush_buffer(tty); 672 tty->driver->flush_buffer(tty);
603 673
604 /* Restore default settings */ 674 /* Restore default settings */
605 ax->dev->type = ARPHRD_AX25; 675 dev->type = ARPHRD_AX25;
606 676
607 /* Perform the low-level AX25 initialization. */ 677 /* Perform the low-level AX25 initialization. */
608 if ((err = ax_open(ax->dev))) 678 if ((err = ax_open(ax->dev))) {
609 return err; 679 goto out_free_netdev;
680 }
610 681
611 /* Done. We have linked the TTY line to a channel. */ 682 if (register_netdev(dev))
612 return ax->dev->base_addr; 683 goto out_free_buffers;
613}
614 684
615static void ax25_close(struct tty_struct *tty) 685 netif_start_queue(dev);
616{
617 struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
618 686
619 /* First make sure we're connected. */ 687 /* Done. We have linked the TTY line to a channel. */
620 if (ax == NULL || ax->magic != AX25_MAGIC) 688 return 0;
621 return;
622 689
623 unregister_netdev(ax->dev); 690out_free_buffers:
691 kfree(ax->rbuff);
692 kfree(ax->xbuff);
624 693
625 tty->disc_data = NULL; 694out_free_netdev:
626 ax->tty = NULL; 695 free_netdev(dev);
627 696
628 ax_free(ax); 697out:
698 return err;
629} 699}
630 700
631 701static void mkiss_close(struct tty_struct *tty)
632static struct net_device_stats *ax_get_stats(struct net_device *dev)
633{ 702{
634 static struct net_device_stats stats; 703 struct mkiss *ax;
635 struct ax_disp *ax = netdev_priv(dev);
636
637 memset(&stats, 0, sizeof(struct net_device_stats));
638
639 stats.rx_packets = ax->rx_packets;
640 stats.tx_packets = ax->tx_packets;
641 stats.rx_bytes = ax->rx_bytes;
642 stats.tx_bytes = ax->tx_bytes;
643 stats.rx_dropped = ax->rx_dropped;
644 stats.tx_dropped = ax->tx_dropped;
645 stats.tx_errors = ax->tx_errors;
646 stats.rx_errors = ax->rx_errors;
647 stats.rx_over_errors = ax->rx_over_errors;
648
649 return &stats;
650}
651 704
705 write_lock(&disc_data_lock);
706 ax = tty->disc_data;
707 tty->disc_data = NULL;
708 write_unlock(&disc_data_lock);
652 709
653/************************************************************************ 710 if (ax == 0)
654 * STANDARD ENCAPSULATION * 711 return;
655 ************************************************************************/
656
657static int kiss_esc(unsigned char *s, unsigned char *d, int len)
658{
659 unsigned char *ptr = d;
660 unsigned char c;
661 712
662 /* 713 /*
663 * Send an initial END character to flush out any 714 * We have now ensured that nobody can start using ap from now on, but
664 * data that may have accumulated in the receiver 715 * we have to wait for all existing users to finish.
665 * due to line noise.
666 */ 716 */
717 if (!atomic_dec_and_test(&ax->refcnt))
718 down(&ax->dead_sem);
667 719
668 *ptr++ = END; 720 unregister_netdev(ax->dev);
669
670 while (len-- > 0) {
671 switch (c = *s++) {
672 case END:
673 *ptr++ = ESC;
674 *ptr++ = ESC_END;
675 break;
676 case ESC:
677 *ptr++ = ESC;
678 *ptr++ = ESC_ESC;
679 break;
680 default:
681 *ptr++ = c;
682 break;
683 }
684 }
685 721
686 *ptr++ = END; 722 /* Free all AX25 frame buffers. */
723 kfree(ax->rbuff);
724 kfree(ax->xbuff);
687 725
688 return ptr - d; 726 ax->tty = NULL;
689} 727}
690 728
691/* 729/* Perform I/O control on an active ax25 channel. */
692 * MW: 730static int mkiss_ioctl(struct tty_struct *tty, struct file *file,
693 * OK its ugly, but tell me a better solution without copying the 731 unsigned int cmd, unsigned long arg)
694 * packet to a temporary buffer :-)
695 */
696static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc, int len)
697{ 732{
698 unsigned char *ptr = d; 733 struct mkiss *ax = mkiss_get(tty);
699 unsigned char c=0; 734 struct net_device *dev = ax->dev;
700 735 unsigned int tmp, err;
701 *ptr++ = END;
702 while (len > 0) {
703 if (len > 2)
704 c = *s++;
705 else if (len > 1)
706 c = crc >> 8;
707 else if (len > 0)
708 c = crc & 0xff;
709 736
710 len--; 737 /* First make sure we're connected. */
738 if (ax == NULL)
739 return -ENXIO;
711 740
712 switch (c) { 741 switch (cmd) {
713 case END: 742 case SIOCGIFNAME:
714 *ptr++ = ESC; 743 err = copy_to_user((void __user *) arg, ax->dev->name,
715 *ptr++ = ESC_END; 744 strlen(ax->dev->name) + 1) ? -EFAULT : 0;
716 break; 745 break;
717 case ESC: 746
718 *ptr++ = ESC; 747 case SIOCGIFENCAP:
719 *ptr++ = ESC_ESC; 748 err = put_user(4, (int __user *) arg);
720 break; 749 break;
721 default: 750
722 *ptr++ = c; 751 case SIOCSIFENCAP:
723 break; 752 if (get_user(tmp, (int __user *) arg)) {
753 err = -EFAULT;
754 break;
724 } 755 }
725 }
726 *ptr++ = END;
727 return ptr - d;
728}
729 756
730static void kiss_unesc(struct ax_disp *ax, unsigned char s) 757 ax->mode = tmp;
731{ 758 dev->addr_len = AX25_ADDR_LEN;
732 switch (s) { 759 dev->hard_header_len = AX25_KISS_HEADER_LEN +
733 case END: 760 AX25_MAX_HEADER_LEN + 3;
734 /* drop keeptest bit = VSV */ 761 dev->type = ARPHRD_AX25;
735 if (test_bit(AXF_KEEPTEST, &ax->flags))
736 clear_bit(AXF_KEEPTEST, &ax->flags);
737 762
738 if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2)) 763 err = 0;
739 ax_bump(ax); 764 break;
740 765
741 clear_bit(AXF_ESCAPE, &ax->flags); 766 case SIOCSIFHWADDR: {
742 ax->rcount = 0; 767 char addr[AX25_ADDR_LEN];
743 return; 768printk(KERN_INFO "In SIOCSIFHWADDR");
744 769
745 case ESC: 770 if (copy_from_user(&addr,
746 set_bit(AXF_ESCAPE, &ax->flags); 771 (void __user *) arg, AX25_ADDR_LEN)) {
747 return; 772 err = -EFAULT;
748 case ESC_ESC:
749 if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
750 s = ESC;
751 break; 773 break;
752 case ESC_END:
753 if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
754 s = END;
755 break;
756 }
757
758 spin_lock_bh(&ax->buflock);
759 if (!test_bit(AXF_ERROR, &ax->flags)) {
760 if (ax->rcount < ax->buffsize) {
761 ax->rbuff[ax->rcount++] = s;
762 spin_unlock_bh(&ax->buflock);
763 return;
764 } 774 }
765 775
766 ax->rx_over_errors++; 776 spin_lock_irq(&dev->xmit_lock);
767 set_bit(AXF_ERROR, &ax->flags); 777 memcpy(dev->dev_addr, addr, AX25_ADDR_LEN);
778 spin_unlock_irq(&dev->xmit_lock);
779
780 err = 0;
781 break;
782 }
783 default:
784 err = -ENOIOCTLCMD;
768 } 785 }
769 spin_unlock_bh(&ax->buflock);
770}
771 786
787 mkiss_put(ax);
772 788
773static int ax_set_mac_address(struct net_device *dev, void __user *addr) 789 return err;
774{
775 if (copy_from_user(dev->dev_addr, addr, AX25_ADDR_LEN))
776 return -EFAULT;
777 return 0;
778} 790}
779 791
780static int ax_set_dev_mac_address(struct net_device *dev, void *addr) 792/*
793 * Handle the 'receiver data ready' interrupt.
794 * This function is called by the 'tty_io' module in the kernel when
795 * a block of data has been received, which can now be decapsulated
796 * and sent on to the AX.25 layer for further processing.
797 */
798static void mkiss_receive_buf(struct tty_struct *tty, const unsigned char *cp,
799 char *fp, int count)
781{ 800{
782 struct sockaddr *sa = addr; 801 struct mkiss *ax = mkiss_get(tty);
783
784 memcpy(dev->dev_addr, sa->sa_data, AX25_ADDR_LEN);
785 802
786 return 0; 803 if (!ax)
787} 804 return;
788
789
790/* Perform I/O control on an active ax25 channel. */
791static int ax25_disp_ioctl(struct tty_struct *tty, void *file, int cmd, void __user *arg)
792{
793 struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
794 unsigned int tmp;
795 805
796 /* First make sure we're connected. */ 806 /*
797 if (ax == NULL || ax->magic != AX25_MAGIC) 807 * Argh! mtu change time! - costs us the packet part received
798 return -EINVAL; 808 * at the change
809 */
810 if (ax->mtu != ax->dev->mtu + 73)
811 ax_changedmtu(ax);
799 812
800 switch (cmd) { 813 /* Read the characters out of the buffer */
801 case SIOCGIFNAME: 814 while (count--) {
802 if (copy_to_user(arg, ax->dev->name, strlen(ax->dev->name) + 1)) 815 if (fp != NULL && *fp++) {
803 return -EFAULT; 816 if (!test_and_set_bit(AXF_ERROR, &ax->flags))
804 return 0; 817 ax->stats.rx_errors++;
805 818 cp++;
806 case SIOCGIFENCAP: 819 continue;
807 return put_user(4, (int __user *)arg); 820 }
808
809 case SIOCSIFENCAP:
810 if (get_user(tmp, (int __user *)arg))
811 return -EFAULT;
812 ax->mode = tmp;
813 ax->dev->addr_len = AX25_ADDR_LEN; /* sizeof an AX.25 addr */
814 ax->dev->hard_header_len = AX25_KISS_HEADER_LEN + AX25_MAX_HEADER_LEN + 3;
815 ax->dev->type = ARPHRD_AX25;
816 return 0;
817
818 case SIOCSIFHWADDR:
819 return ax_set_mac_address(ax->dev, arg);
820 821
821 default: 822 kiss_unesc(ax, *cp++);
822 return -ENOIOCTLCMD;
823 } 823 }
824
825 mkiss_put(ax);
826 if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
827 && tty->driver->unthrottle)
828 tty->driver->unthrottle(tty);
824} 829}
825 830
826static int ax_open_dev(struct net_device *dev) 831static int mkiss_receive_room(struct tty_struct *tty)
827{ 832{
828 struct ax_disp *ax = netdev_priv(dev); 833 return 65536; /* We can handle an infinite amount of data. :-) */
829
830 if (ax->tty == NULL)
831 return -ENODEV;
832
833 return 0;
834} 834}
835 835
836 836/*
837/* Initialize the driver. Called by network startup. */ 837 * Called by the driver when there's room for more data. If we have
838static int ax25_init(struct net_device *dev) 838 * more packets to send, we send them here.
839 */
840static void mkiss_write_wakeup(struct tty_struct *tty)
839{ 841{
840 struct ax_disp *ax = netdev_priv(dev); 842 struct mkiss *ax = mkiss_get(tty);
841 843 int actual;
842 static char ax25_bcast[AX25_ADDR_LEN] =
843 {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1};
844 static char ax25_test[AX25_ADDR_LEN] =
845 {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1};
846
847 if (ax == NULL) /* Allocation failed ?? */
848 return -ENODEV;
849 844
850 /* Set up the "AX25 Control Block". (And clear statistics) */ 845 if (!ax)
851 memset(ax, 0, sizeof (struct ax_disp)); 846 return;
852 ax->magic = AX25_MAGIC;
853 ax->dev = dev;
854 847
855 /* Finish setting up the DEVICE info. */ 848 if (ax->xleft <= 0) {
856 dev->mtu = AX_MTU; 849 /* Now serial buffer is almost free & we can start
857 dev->hard_start_xmit = ax_xmit; 850 * transmission of another packet
858 dev->open = ax_open_dev; 851 */
859 dev->stop = ax_close; 852 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
860 dev->get_stats = ax_get_stats;
861 dev->set_mac_address = ax_set_dev_mac_address;
862 dev->hard_header_len = 0;
863 dev->addr_len = 0;
864 dev->type = ARPHRD_AX25;
865 dev->tx_queue_len = 10;
866 dev->hard_header = ax_header;
867 dev->rebuild_header = ax_rebuild_header;
868 853
869 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN); 854 netif_wake_queue(ax->dev);
870 memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN); 855 goto out;
856 }
871 857
872 /* New-style flags. */ 858 actual = tty->driver->write(tty, ax->xhead, ax->xleft);
873 dev->flags = IFF_BROADCAST | IFF_MULTICAST; 859 ax->xleft -= actual;
860 ax->xhead += actual;
874 861
875 return 0; 862out:
863 mkiss_put(ax);
876} 864}
877 865
866static struct tty_ldisc ax_ldisc = {
867 .magic = TTY_LDISC_MAGIC,
868 .name = "mkiss",
869 .open = mkiss_open,
870 .close = mkiss_close,
871 .ioctl = mkiss_ioctl,
872 .receive_buf = mkiss_receive_buf,
873 .receive_room = mkiss_receive_room,
874 .write_wakeup = mkiss_write_wakeup
875};
878 876
879/* ******************************************************************** */ 877static char banner[] __initdata = KERN_INFO \
880/* * Init MKISS driver * */ 878 "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n";
881/* ******************************************************************** */ 879static char msg_regfail[] __initdata = KERN_ERR \
880 "mkiss: can't register line discipline (err = %d)\n";
882 881
883static int __init mkiss_init_driver(void) 882static int __init mkiss_init_driver(void)
884{ 883{
@@ -886,64 +885,27 @@ static int __init mkiss_init_driver(void)
886 885
887 printk(banner); 886 printk(banner);
888 887
889 if (ax25_maxdev < 4) 888 if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0)
890 ax25_maxdev = 4; /* Sanity */ 889 printk(msg_regfail);
891 890
892 if ((ax25_ctrls = kmalloc(sizeof(void *) * ax25_maxdev, GFP_KERNEL)) == NULL) {
893 printk(KERN_ERR "mkiss: Can't allocate ax25_ctrls[] array!\n");
894 return -ENOMEM;
895 }
896
897 /* Clear the pointer array, we allocate devices when we need them */
898 memset(ax25_ctrls, 0, sizeof(void*) * ax25_maxdev); /* Pointers */
899
900 /* Fill in our line protocol discipline, and register it */
901 ax_ldisc.magic = TTY_LDISC_MAGIC;
902 ax_ldisc.name = "mkiss";
903 ax_ldisc.open = ax25_open;
904 ax_ldisc.close = ax25_close;
905 ax_ldisc.ioctl = (int (*)(struct tty_struct *, struct file *,
906 unsigned int, unsigned long))ax25_disp_ioctl;
907 ax_ldisc.receive_buf = ax25_receive_buf;
908 ax_ldisc.receive_room = ax25_receive_room;
909 ax_ldisc.write_wakeup = ax25_write_wakeup;
910
911 if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0) {
912 printk(KERN_ERR "mkiss: can't register line discipline (err = %d)\n", status);
913 kfree(ax25_ctrls);
914 }
915 return status; 891 return status;
916} 892}
917 893
894static const char msg_unregfail[] __exitdata = KERN_ERR \
895 "mkiss: can't unregister line discipline (err = %d)\n";
896
918static void __exit mkiss_exit_driver(void) 897static void __exit mkiss_exit_driver(void)
919{ 898{
920 int i; 899 int ret;
921
922 for (i = 0; i < ax25_maxdev; i++) {
923 if (ax25_ctrls[i]) {
924 /*
925 * VSV = if dev->start==0, then device
926 * unregistered while close proc.
927 */
928 if (netif_running(&ax25_ctrls[i]->dev))
929 unregister_netdev(&ax25_ctrls[i]->dev);
930 kfree(ax25_ctrls[i]);
931 }
932 }
933 900
934 kfree(ax25_ctrls); 901 if ((ret = tty_unregister_ldisc(N_AX25)))
935 ax25_ctrls = NULL; 902 printk(msg_unregfail, ret);
936
937 if ((i = tty_unregister_ldisc(N_AX25)))
938 printk(KERN_ERR "mkiss: can't unregister line discipline (err = %d)\n", i);
939} 903}
940 904
941MODULE_AUTHOR("Hans Albas PE1AYX <hans@esrac.ele.tue.nl>"); 905MODULE_AUTHOR("Ralf Baechle DL5RB <ralf@linux-mips.org>");
942MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs"); 906MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs");
943MODULE_PARM(ax25_maxdev, "i");
944MODULE_PARM_DESC(ax25_maxdev, "number of MKISS devices");
945MODULE_LICENSE("GPL"); 907MODULE_LICENSE("GPL");
946MODULE_ALIAS_LDISC(N_AX25); 908MODULE_ALIAS_LDISC(N_AX25);
909
947module_init(mkiss_init_driver); 910module_init(mkiss_init_driver);
948module_exit(mkiss_exit_driver); 911module_exit(mkiss_exit_driver);
949
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 16:06:54 -0500