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1da177e4 LT |
1 | /* |
2 | * Copyright 1996 The Board of Trustees of The Leland Stanford | |
3 | * Junior University. All Rights Reserved. | |
4 | * | |
5 | * Permission to use, copy, modify, and distribute this | |
6 | * software and its documentation for any purpose and without | |
7 | * fee is hereby granted, provided that the above copyright | |
8 | * notice appear in all copies. Stanford University | |
9 | * makes no representations about the suitability of this | |
10 | * software for any purpose. It is provided "as is" without | |
11 | * express or implied warranty. | |
12 | * | |
13 | * strip.c This module implements Starmode Radio IP (STRIP) | |
14 | * for kernel-based devices like TTY. It interfaces between a | |
15 | * raw TTY, and the kernel's INET protocol layers (via DDI). | |
16 | * | |
17 | * Version: @(#)strip.c 1.3 July 1997 | |
18 | * | |
19 | * Author: Stuart Cheshire <cheshire@cs.stanford.edu> | |
20 | * | |
21 | * Fixes: v0.9 12th Feb 1996 (SC) | |
22 | * New byte stuffing (2+6 run-length encoding) | |
23 | * New watchdog timer task | |
24 | * New Protocol key (SIP0) | |
25 | * | |
26 | * v0.9.1 3rd March 1996 (SC) | |
27 | * Changed to dynamic device allocation -- no more compile | |
28 | * time (or boot time) limit on the number of STRIP devices. | |
29 | * | |
30 | * v0.9.2 13th March 1996 (SC) | |
31 | * Uses arp cache lookups (but doesn't send arp packets yet) | |
32 | * | |
33 | * v0.9.3 17th April 1996 (SC) | |
34 | * Fixed bug where STR_ERROR flag was getting set unneccessarily | |
35 | * (causing otherwise good packets to be unneccessarily dropped) | |
36 | * | |
37 | * v0.9.4 27th April 1996 (SC) | |
38 | * First attempt at using "&COMMAND" Starmode AT commands | |
39 | * | |
40 | * v0.9.5 29th May 1996 (SC) | |
41 | * First attempt at sending (unicast) ARP packets | |
42 | * | |
43 | * v0.9.6 5th June 1996 (Elliot) | |
44 | * Put "message level" tags in every "printk" statement | |
45 | * | |
46 | * v0.9.7 13th June 1996 (laik) | |
47 | * Added support for the /proc fs | |
48 | * | |
49 | * v0.9.8 July 1996 (Mema) | |
50 | * Added packet logging | |
51 | * | |
52 | * v1.0 November 1996 (SC) | |
53 | * Fixed (severe) memory leaks in the /proc fs code | |
54 | * Fixed race conditions in the logging code | |
55 | * | |
56 | * v1.1 January 1997 (SC) | |
57 | * Deleted packet logging (use tcpdump instead) | |
58 | * Added support for Metricom Firmware v204 features | |
59 | * (like message checksums) | |
60 | * | |
61 | * v1.2 January 1997 (SC) | |
62 | * Put portables list back in | |
63 | * | |
64 | * v1.3 July 1997 (SC) | |
65 | * Made STRIP driver set the radio's baud rate automatically. | |
66 | * It is no longer necessarily to manually set the radio's | |
67 | * rate permanently to 115200 -- the driver handles setting | |
68 | * the rate automatically. | |
69 | */ | |
70 | ||
71 | #ifdef MODULE | |
72 | static const char StripVersion[] = "1.3A-STUART.CHESHIRE-MODULAR"; | |
73 | #else | |
74 | static const char StripVersion[] = "1.3A-STUART.CHESHIRE"; | |
75 | #endif | |
76 | ||
77 | #define TICKLE_TIMERS 0 | |
78 | #define EXT_COUNTERS 1 | |
79 | ||
80 | ||
81 | /************************************************************************/ | |
82 | /* Header files */ | |
83 | ||
84 | #include <linux/config.h> | |
85 | #include <linux/kernel.h> | |
86 | #include <linux/module.h> | |
87 | #include <linux/init.h> | |
88 | #include <linux/bitops.h> | |
89 | #include <asm/system.h> | |
90 | #include <asm/uaccess.h> | |
91 | ||
92 | # include <linux/ctype.h> | |
93 | #include <linux/string.h> | |
94 | #include <linux/mm.h> | |
95 | #include <linux/interrupt.h> | |
96 | #include <linux/in.h> | |
97 | #include <linux/tty.h> | |
98 | #include <linux/errno.h> | |
99 | #include <linux/netdevice.h> | |
100 | #include <linux/inetdevice.h> | |
101 | #include <linux/etherdevice.h> | |
102 | #include <linux/skbuff.h> | |
103 | #include <linux/if_arp.h> | |
104 | #include <linux/if_strip.h> | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #include <linux/serial.h> | |
108 | #include <linux/serialP.h> | |
109 | #include <linux/rcupdate.h> | |
110 | #include <net/arp.h> | |
111 | ||
112 | #include <linux/ip.h> | |
113 | #include <linux/tcp.h> | |
114 | #include <linux/time.h> | |
115 | ||
116 | ||
117 | /************************************************************************/ | |
118 | /* Useful structures and definitions */ | |
119 | ||
120 | /* | |
121 | * A MetricomKey identifies the protocol being carried inside a Metricom | |
122 | * Starmode packet. | |
123 | */ | |
124 | ||
125 | typedef union { | |
126 | __u8 c[4]; | |
127 | __u32 l; | |
128 | } MetricomKey; | |
129 | ||
130 | /* | |
131 | * An IP address can be viewed as four bytes in memory (which is what it is) or as | |
132 | * a single 32-bit long (which is convenient for assignment, equality testing etc.) | |
133 | */ | |
134 | ||
135 | typedef union { | |
136 | __u8 b[4]; | |
137 | __u32 l; | |
138 | } IPaddr; | |
139 | ||
140 | /* | |
141 | * A MetricomAddressString is used to hold a printable representation of | |
142 | * a Metricom address. | |
143 | */ | |
144 | ||
145 | typedef struct { | |
146 | __u8 c[24]; | |
147 | } MetricomAddressString; | |
148 | ||
149 | /* Encapsulation can expand packet of size x to 65/64x + 1 | |
150 | * Sent packet looks like "<CR>*<address>*<key><encaps payload><CR>" | |
151 | * 1 1 1-18 1 4 ? 1 | |
152 | * eg. <CR>*0000-1234*SIP0<encaps payload><CR> | |
153 | * We allow 31 bytes for the stars, the key, the address and the <CR>s | |
154 | */ | |
155 | #define STRIP_ENCAP_SIZE(X) (32 + (X)*65L/64L) | |
156 | ||
157 | /* | |
158 | * A STRIP_Header is never really sent over the radio, but making a dummy | |
159 | * header for internal use within the kernel that looks like an Ethernet | |
160 | * header makes certain other software happier. For example, tcpdump | |
161 | * already understands Ethernet headers. | |
162 | */ | |
163 | ||
164 | typedef struct { | |
165 | MetricomAddress dst_addr; /* Destination address, e.g. "0000-1234" */ | |
166 | MetricomAddress src_addr; /* Source address, e.g. "0000-5678" */ | |
167 | unsigned short protocol; /* The protocol type, using Ethernet codes */ | |
168 | } STRIP_Header; | |
169 | ||
170 | typedef struct { | |
171 | char c[60]; | |
172 | } MetricomNode; | |
173 | ||
174 | #define NODE_TABLE_SIZE 32 | |
175 | typedef struct { | |
176 | struct timeval timestamp; | |
177 | int num_nodes; | |
178 | MetricomNode node[NODE_TABLE_SIZE]; | |
179 | } MetricomNodeTable; | |
180 | ||
181 | enum { FALSE = 0, TRUE = 1 }; | |
182 | ||
183 | /* | |
184 | * Holds the radio's firmware version. | |
185 | */ | |
186 | typedef struct { | |
187 | char c[50]; | |
188 | } FirmwareVersion; | |
189 | ||
190 | /* | |
191 | * Holds the radio's serial number. | |
192 | */ | |
193 | typedef struct { | |
194 | char c[18]; | |
195 | } SerialNumber; | |
196 | ||
197 | /* | |
198 | * Holds the radio's battery voltage. | |
199 | */ | |
200 | typedef struct { | |
201 | char c[11]; | |
202 | } BatteryVoltage; | |
203 | ||
204 | typedef struct { | |
205 | char c[8]; | |
206 | } char8; | |
207 | ||
208 | enum { | |
209 | NoStructure = 0, /* Really old firmware */ | |
210 | StructuredMessages = 1, /* Parsable AT response msgs */ | |
211 | ChecksummedMessages = 2 /* Parsable AT response msgs with checksums */ | |
ff1d2767 | 212 | }; |
1da177e4 LT |
213 | |
214 | struct strip { | |
215 | int magic; | |
216 | /* | |
217 | * These are pointers to the malloc()ed frame buffers. | |
218 | */ | |
219 | ||
220 | unsigned char *rx_buff; /* buffer for received IP packet */ | |
221 | unsigned char *sx_buff; /* buffer for received serial data */ | |
222 | int sx_count; /* received serial data counter */ | |
223 | int sx_size; /* Serial buffer size */ | |
224 | unsigned char *tx_buff; /* transmitter buffer */ | |
225 | unsigned char *tx_head; /* pointer to next byte to XMIT */ | |
226 | int tx_left; /* bytes left in XMIT queue */ | |
227 | int tx_size; /* Serial buffer size */ | |
228 | ||
229 | /* | |
230 | * STRIP interface statistics. | |
231 | */ | |
232 | ||
233 | unsigned long rx_packets; /* inbound frames counter */ | |
234 | unsigned long tx_packets; /* outbound frames counter */ | |
235 | unsigned long rx_errors; /* Parity, etc. errors */ | |
236 | unsigned long tx_errors; /* Planned stuff */ | |
237 | unsigned long rx_dropped; /* No memory for skb */ | |
238 | unsigned long tx_dropped; /* When MTU change */ | |
239 | unsigned long rx_over_errors; /* Frame bigger then STRIP buf. */ | |
240 | ||
241 | unsigned long pps_timer; /* Timer to determine pps */ | |
242 | unsigned long rx_pps_count; /* Counter to determine pps */ | |
243 | unsigned long tx_pps_count; /* Counter to determine pps */ | |
244 | unsigned long sx_pps_count; /* Counter to determine pps */ | |
245 | unsigned long rx_average_pps; /* rx packets per second * 8 */ | |
246 | unsigned long tx_average_pps; /* tx packets per second * 8 */ | |
247 | unsigned long sx_average_pps; /* sent packets per second * 8 */ | |
248 | ||
249 | #ifdef EXT_COUNTERS | |
250 | unsigned long rx_bytes; /* total received bytes */ | |
251 | unsigned long tx_bytes; /* total received bytes */ | |
252 | unsigned long rx_rbytes; /* bytes thru radio i/f */ | |
253 | unsigned long tx_rbytes; /* bytes thru radio i/f */ | |
254 | unsigned long rx_sbytes; /* tot bytes thru serial i/f */ | |
255 | unsigned long tx_sbytes; /* tot bytes thru serial i/f */ | |
256 | unsigned long rx_ebytes; /* tot stat/err bytes */ | |
257 | unsigned long tx_ebytes; /* tot stat/err bytes */ | |
258 | #endif | |
259 | ||
260 | /* | |
261 | * Internal variables. | |
262 | */ | |
263 | ||
264 | struct list_head list; /* Linked list of devices */ | |
265 | ||
266 | int discard; /* Set if serial error */ | |
267 | int working; /* Is radio working correctly? */ | |
268 | int firmware_level; /* Message structuring level */ | |
269 | int next_command; /* Next periodic command */ | |
270 | unsigned int user_baud; /* The user-selected baud rate */ | |
271 | int mtu; /* Our mtu (to spot changes!) */ | |
272 | long watchdog_doprobe; /* Next time to test the radio */ | |
273 | long watchdog_doreset; /* Time to do next reset */ | |
274 | long gratuitous_arp; /* Time to send next ARP refresh */ | |
275 | long arp_interval; /* Next ARP interval */ | |
276 | struct timer_list idle_timer; /* For periodic wakeup calls */ | |
277 | MetricomAddress true_dev_addr; /* True address of radio */ | |
278 | int manual_dev_addr; /* Hack: See note below */ | |
279 | ||
280 | FirmwareVersion firmware_version; /* The radio's firmware version */ | |
281 | SerialNumber serial_number; /* The radio's serial number */ | |
282 | BatteryVoltage battery_voltage; /* The radio's battery voltage */ | |
283 | ||
284 | /* | |
285 | * Other useful structures. | |
286 | */ | |
287 | ||
288 | struct tty_struct *tty; /* ptr to TTY structure */ | |
289 | struct net_device *dev; /* Our device structure */ | |
290 | ||
291 | /* | |
292 | * Neighbour radio records | |
293 | */ | |
294 | ||
295 | MetricomNodeTable portables; | |
296 | MetricomNodeTable poletops; | |
297 | }; | |
298 | ||
299 | /* | |
300 | * Note: manual_dev_addr hack | |
301 | * | |
302 | * It is not possible to change the hardware address of a Metricom radio, | |
303 | * or to send packets with a user-specified hardware source address, thus | |
304 | * trying to manually set a hardware source address is a questionable | |
305 | * thing to do. However, if the user *does* manually set the hardware | |
306 | * source address of a STRIP interface, then the kernel will believe it, | |
307 | * and use it in certain places. For example, the hardware address listed | |
308 | * by ifconfig will be the manual address, not the true one. | |
309 | * (Both addresses are listed in /proc/net/strip.) | |
310 | * Also, ARP packets will be sent out giving the user-specified address as | |
311 | * the source address, not the real address. This is dangerous, because | |
312 | * it means you won't receive any replies -- the ARP replies will go to | |
313 | * the specified address, which will be some other radio. The case where | |
314 | * this is useful is when that other radio is also connected to the same | |
315 | * machine. This allows you to connect a pair of radios to one machine, | |
316 | * and to use one exclusively for inbound traffic, and the other | |
317 | * exclusively for outbound traffic. Pretty neat, huh? | |
318 | * | |
319 | * Here's the full procedure to set this up: | |
320 | * | |
321 | * 1. "slattach" two interfaces, e.g. st0 for outgoing packets, | |
322 | * and st1 for incoming packets | |
323 | * | |
324 | * 2. "ifconfig" st0 (outbound radio) to have the hardware address | |
325 | * which is the real hardware address of st1 (inbound radio). | |
326 | * Now when it sends out packets, it will masquerade as st1, and | |
327 | * replies will be sent to that radio, which is exactly what we want. | |
328 | * | |
329 | * 3. Set the route table entry ("route add default ..." or | |
330 | * "route add -net ...", as appropriate) to send packets via the st0 | |
331 | * interface (outbound radio). Do not add any route which sends packets | |
332 | * out via the st1 interface -- that radio is for inbound traffic only. | |
333 | * | |
334 | * 4. "ifconfig" st1 (inbound radio) to have hardware address zero. | |
335 | * This tells the STRIP driver to "shut down" that interface and not | |
336 | * send any packets through it. In particular, it stops sending the | |
337 | * periodic gratuitous ARP packets that a STRIP interface normally sends. | |
338 | * Also, when packets arrive on that interface, it will search the | |
339 | * interface list to see if there is another interface who's manual | |
340 | * hardware address matches its own real address (i.e. st0 in this | |
341 | * example) and if so it will transfer ownership of the skbuff to | |
342 | * that interface, so that it looks to the kernel as if the packet | |
343 | * arrived on that interface. This is necessary because when the | |
344 | * kernel sends an ARP packet on st0, it expects to get a reply on | |
345 | * st0, and if it sees the reply come from st1 then it will ignore | |
346 | * it (to be accurate, it puts the entry in the ARP table, but | |
347 | * labelled in such a way that st0 can't use it). | |
348 | * | |
349 | * Thanks to Petros Maniatis for coming up with the idea of splitting | |
350 | * inbound and outbound traffic between two interfaces, which turned | |
351 | * out to be really easy to implement, even if it is a bit of a hack. | |
352 | * | |
353 | * Having set a manual address on an interface, you can restore it | |
354 | * to automatic operation (where the address is automatically kept | |
355 | * consistent with the real address of the radio) by setting a manual | |
356 | * address of all ones, e.g. "ifconfig st0 hw strip FFFFFFFFFFFF" | |
357 | * This 'turns off' manual override mode for the device address. | |
358 | * | |
359 | * Note: The IEEE 802 headers reported in tcpdump will show the *real* | |
360 | * radio addresses the packets were sent and received from, so that you | |
361 | * can see what is really going on with packets, and which interfaces | |
362 | * they are really going through. | |
363 | */ | |
364 | ||
365 | ||
366 | /************************************************************************/ | |
367 | /* Constants */ | |
368 | ||
369 | /* | |
370 | * CommandString1 works on all radios | |
371 | * Other CommandStrings are only used with firmware that provides structured responses. | |
372 | * | |
373 | * ats319=1 Enables Info message for node additions and deletions | |
374 | * ats319=2 Enables Info message for a new best node | |
375 | * ats319=4 Enables checksums | |
376 | * ats319=8 Enables ACK messages | |
377 | */ | |
378 | ||
379 | static const int MaxCommandStringLength = 32; | |
380 | static const int CompatibilityCommand = 1; | |
381 | ||
382 | static const char CommandString0[] = "*&COMMAND*ATS319=7"; /* Turn on checksums & info messages */ | |
383 | static const char CommandString1[] = "*&COMMAND*ATS305?"; /* Query radio name */ | |
384 | static const char CommandString2[] = "*&COMMAND*ATS325?"; /* Query battery voltage */ | |
385 | static const char CommandString3[] = "*&COMMAND*ATS300?"; /* Query version information */ | |
386 | static const char CommandString4[] = "*&COMMAND*ATS311?"; /* Query poletop list */ | |
387 | static const char CommandString5[] = "*&COMMAND*AT~LA"; /* Query portables list */ | |
388 | typedef struct { | |
389 | const char *string; | |
390 | long length; | |
391 | } StringDescriptor; | |
392 | ||
393 | static const StringDescriptor CommandString[] = { | |
394 | {CommandString0, sizeof(CommandString0) - 1}, | |
395 | {CommandString1, sizeof(CommandString1) - 1}, | |
396 | {CommandString2, sizeof(CommandString2) - 1}, | |
397 | {CommandString3, sizeof(CommandString3) - 1}, | |
398 | {CommandString4, sizeof(CommandString4) - 1}, | |
399 | {CommandString5, sizeof(CommandString5) - 1} | |
400 | }; | |
401 | ||
402 | #define GOT_ALL_RADIO_INFO(S) \ | |
403 | ((S)->firmware_version.c[0] && \ | |
404 | (S)->battery_voltage.c[0] && \ | |
405 | memcmp(&(S)->true_dev_addr, zero_address.c, sizeof(zero_address))) | |
406 | ||
407 | static const char hextable[16] = "0123456789ABCDEF"; | |
408 | ||
409 | static const MetricomAddress zero_address; | |
410 | static const MetricomAddress broadcast_address = | |
411 | { {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF} }; | |
412 | ||
413 | static const MetricomKey SIP0Key = { "SIP0" }; | |
414 | static const MetricomKey ARP0Key = { "ARP0" }; | |
415 | static const MetricomKey ATR_Key = { "ATR " }; | |
416 | static const MetricomKey ACK_Key = { "ACK_" }; | |
417 | static const MetricomKey INF_Key = { "INF_" }; | |
418 | static const MetricomKey ERR_Key = { "ERR_" }; | |
419 | ||
420 | static const long MaxARPInterval = 60 * HZ; /* One minute */ | |
421 | ||
422 | /* | |
423 | * Maximum Starmode packet length is 1183 bytes. Allowing 4 bytes for | |
424 | * protocol key, 4 bytes for checksum, one byte for CR, and 65/64 expansion | |
425 | * for STRIP encoding, that translates to a maximum payload MTU of 1155. | |
426 | * Note: A standard NFS 1K data packet is a total of 0x480 (1152) bytes | |
427 | * long, including IP header, UDP header, and NFS header. Setting the STRIP | |
428 | * MTU to 1152 allows us to send default sized NFS packets without fragmentation. | |
429 | */ | |
430 | static const unsigned short MAX_SEND_MTU = 1152; | |
431 | static const unsigned short MAX_RECV_MTU = 1500; /* Hoping for Ethernet sized packets in the future! */ | |
432 | static const unsigned short DEFAULT_STRIP_MTU = 1152; | |
433 | static const int STRIP_MAGIC = 0x5303; | |
434 | static const long LongTime = 0x7FFFFFFF; | |
435 | ||
436 | /************************************************************************/ | |
437 | /* Global variables */ | |
438 | ||
439 | static LIST_HEAD(strip_list); | |
440 | static DEFINE_SPINLOCK(strip_lock); | |
441 | ||
442 | /************************************************************************/ | |
443 | /* Macros */ | |
444 | ||
445 | /* Returns TRUE if text T begins with prefix P */ | |
446 | #define has_prefix(T,L,P) (((L) >= sizeof(P)-1) && !strncmp((T), (P), sizeof(P)-1)) | |
447 | ||
448 | /* Returns TRUE if text T of length L is equal to string S */ | |
449 | #define text_equal(T,L,S) (((L) == sizeof(S)-1) && !strncmp((T), (S), sizeof(S)-1)) | |
450 | ||
451 | #define READHEX(X) ((X)>='0' && (X)<='9' ? (X)-'0' : \ | |
452 | (X)>='a' && (X)<='f' ? (X)-'a'+10 : \ | |
453 | (X)>='A' && (X)<='F' ? (X)-'A'+10 : 0 ) | |
454 | ||
455 | #define READHEX16(X) ((__u16)(READHEX(X))) | |
456 | ||
457 | #define READDEC(X) ((X)>='0' && (X)<='9' ? (X)-'0' : 0) | |
458 | ||
459 | #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) | |
460 | ||
461 | #define JIFFIE_TO_SEC(X) ((X) / HZ) | |
462 | ||
463 | ||
464 | /************************************************************************/ | |
465 | /* Utility routines */ | |
466 | ||
467 | static int arp_query(unsigned char *haddr, u32 paddr, | |
468 | struct net_device *dev) | |
469 | { | |
470 | struct neighbour *neighbor_entry; | |
471 | ||
472 | neighbor_entry = neigh_lookup(&arp_tbl, &paddr, dev); | |
473 | ||
474 | if (neighbor_entry != NULL) { | |
475 | neighbor_entry->used = jiffies; | |
476 | if (neighbor_entry->nud_state & NUD_VALID) { | |
477 | memcpy(haddr, neighbor_entry->ha, dev->addr_len); | |
478 | return 1; | |
479 | } | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static void DumpData(char *msg, struct strip *strip_info, __u8 * ptr, | |
485 | __u8 * end) | |
486 | { | |
487 | static const int MAX_DumpData = 80; | |
488 | __u8 pkt_text[MAX_DumpData], *p = pkt_text; | |
489 | ||
490 | *p++ = '\"'; | |
491 | ||
492 | while (ptr < end && p < &pkt_text[MAX_DumpData - 4]) { | |
493 | if (*ptr == '\\') { | |
494 | *p++ = '\\'; | |
495 | *p++ = '\\'; | |
496 | } else { | |
497 | if (*ptr >= 32 && *ptr <= 126) { | |
498 | *p++ = *ptr; | |
499 | } else { | |
500 | sprintf(p, "\\%02X", *ptr); | |
501 | p += 3; | |
502 | } | |
503 | } | |
504 | ptr++; | |
505 | } | |
506 | ||
507 | if (ptr == end) | |
508 | *p++ = '\"'; | |
509 | *p++ = 0; | |
510 | ||
511 | printk(KERN_INFO "%s: %-13s%s\n", strip_info->dev->name, msg, pkt_text); | |
512 | } | |
513 | ||
514 | ||
515 | /************************************************************************/ | |
516 | /* Byte stuffing/unstuffing routines */ | |
517 | ||
518 | /* Stuffing scheme: | |
519 | * 00 Unused (reserved character) | |
520 | * 01-3F Run of 2-64 different characters | |
521 | * 40-7F Run of 1-64 different characters plus a single zero at the end | |
522 | * 80-BF Run of 1-64 of the same character | |
523 | * C0-FF Run of 1-64 zeroes (ASCII 0) | |
524 | */ | |
525 | ||
526 | typedef enum { | |
527 | Stuff_Diff = 0x00, | |
528 | Stuff_DiffZero = 0x40, | |
529 | Stuff_Same = 0x80, | |
530 | Stuff_Zero = 0xC0, | |
531 | Stuff_NoCode = 0xFF, /* Special code, meaning no code selected */ | |
532 | ||
533 | Stuff_CodeMask = 0xC0, | |
534 | Stuff_CountMask = 0x3F, | |
535 | Stuff_MaxCount = 0x3F, | |
536 | Stuff_Magic = 0x0D /* The value we are eliminating */ | |
537 | } StuffingCode; | |
538 | ||
539 | /* StuffData encodes the data starting at "src" for "length" bytes. | |
540 | * It writes it to the buffer pointed to by "dst" (which must be at least | |
541 | * as long as 1 + 65/64 of the input length). The output may be up to 1.6% | |
542 | * larger than the input for pathological input, but will usually be smaller. | |
543 | * StuffData returns the new value of the dst pointer as its result. | |
544 | * "code_ptr_ptr" points to a "__u8 *" which is used to hold encoding state | |
545 | * between calls, allowing an encoded packet to be incrementally built up | |
546 | * from small parts. On the first call, the "__u8 *" pointed to should be | |
547 | * initialized to NULL; between subsequent calls the calling routine should | |
548 | * leave the value alone and simply pass it back unchanged so that the | |
549 | * encoder can recover its current state. | |
550 | */ | |
551 | ||
552 | #define StuffData_FinishBlock(X) \ | |
553 | (*code_ptr = (X) ^ Stuff_Magic, code = Stuff_NoCode) | |
554 | ||
555 | static __u8 *StuffData(__u8 * src, __u32 length, __u8 * dst, | |
556 | __u8 ** code_ptr_ptr) | |
557 | { | |
558 | __u8 *end = src + length; | |
559 | __u8 *code_ptr = *code_ptr_ptr; | |
560 | __u8 code = Stuff_NoCode, count = 0; | |
561 | ||
562 | if (!length) | |
563 | return (dst); | |
564 | ||
565 | if (code_ptr) { | |
566 | /* | |
567 | * Recover state from last call, if applicable | |
568 | */ | |
569 | code = (*code_ptr ^ Stuff_Magic) & Stuff_CodeMask; | |
570 | count = (*code_ptr ^ Stuff_Magic) & Stuff_CountMask; | |
571 | } | |
572 | ||
573 | while (src < end) { | |
574 | switch (code) { | |
575 | /* Stuff_NoCode: If no current code, select one */ | |
576 | case Stuff_NoCode: | |
577 | /* Record where we're going to put this code */ | |
578 | code_ptr = dst++; | |
579 | count = 0; /* Reset the count (zero means one instance) */ | |
580 | /* Tentatively start a new block */ | |
581 | if (*src == 0) { | |
582 | code = Stuff_Zero; | |
583 | src++; | |
584 | } else { | |
585 | code = Stuff_Same; | |
586 | *dst++ = *src++ ^ Stuff_Magic; | |
587 | } | |
588 | /* Note: We optimistically assume run of same -- */ | |
589 | /* which will be fixed later in Stuff_Same */ | |
590 | /* if it turns out not to be true. */ | |
591 | break; | |
592 | ||
593 | /* Stuff_Zero: We already have at least one zero encoded */ | |
594 | case Stuff_Zero: | |
595 | /* If another zero, count it, else finish this code block */ | |
596 | if (*src == 0) { | |
597 | count++; | |
598 | src++; | |
599 | } else { | |
600 | StuffData_FinishBlock(Stuff_Zero + count); | |
601 | } | |
602 | break; | |
603 | ||
604 | /* Stuff_Same: We already have at least one byte encoded */ | |
605 | case Stuff_Same: | |
606 | /* If another one the same, count it */ | |
607 | if ((*src ^ Stuff_Magic) == code_ptr[1]) { | |
608 | count++; | |
609 | src++; | |
610 | break; | |
611 | } | |
612 | /* else, this byte does not match this block. */ | |
613 | /* If we already have two or more bytes encoded, finish this code block */ | |
614 | if (count) { | |
615 | StuffData_FinishBlock(Stuff_Same + count); | |
616 | break; | |
617 | } | |
618 | /* else, we only have one so far, so switch to Stuff_Diff code */ | |
619 | code = Stuff_Diff; | |
620 | /* and fall through to Stuff_Diff case below | |
621 | * Note cunning cleverness here: case Stuff_Diff compares | |
622 | * the current character with the previous two to see if it | |
623 | * has a run of three the same. Won't this be an error if | |
624 | * there aren't two previous characters stored to compare with? | |
625 | * No. Because we know the current character is *not* the same | |
626 | * as the previous one, the first test below will necessarily | |
627 | * fail and the send half of the "if" won't be executed. | |
628 | */ | |
629 | ||
630 | /* Stuff_Diff: We have at least two *different* bytes encoded */ | |
631 | case Stuff_Diff: | |
632 | /* If this is a zero, must encode a Stuff_DiffZero, and begin a new block */ | |
633 | if (*src == 0) { | |
634 | StuffData_FinishBlock(Stuff_DiffZero + | |
635 | count); | |
636 | } | |
637 | /* else, if we have three in a row, it is worth starting a Stuff_Same block */ | |
638 | else if ((*src ^ Stuff_Magic) == dst[-1] | |
639 | && dst[-1] == dst[-2]) { | |
640 | /* Back off the last two characters we encoded */ | |
641 | code += count - 2; | |
642 | /* Note: "Stuff_Diff + 0" is an illegal code */ | |
643 | if (code == Stuff_Diff + 0) { | |
644 | code = Stuff_Same + 0; | |
645 | } | |
646 | StuffData_FinishBlock(code); | |
647 | code_ptr = dst - 2; | |
648 | /* dst[-1] already holds the correct value */ | |
649 | count = 2; /* 2 means three bytes encoded */ | |
650 | code = Stuff_Same; | |
651 | } | |
652 | /* else, another different byte, so add it to the block */ | |
653 | else { | |
654 | *dst++ = *src ^ Stuff_Magic; | |
655 | count++; | |
656 | } | |
657 | src++; /* Consume the byte */ | |
658 | break; | |
659 | } | |
660 | if (count == Stuff_MaxCount) { | |
661 | StuffData_FinishBlock(code + count); | |
662 | } | |
663 | } | |
664 | if (code == Stuff_NoCode) { | |
665 | *code_ptr_ptr = NULL; | |
666 | } else { | |
667 | *code_ptr_ptr = code_ptr; | |
668 | StuffData_FinishBlock(code + count); | |
669 | } | |
670 | return (dst); | |
671 | } | |
672 | ||
673 | /* | |
674 | * UnStuffData decodes the data at "src", up to (but not including) "end". | |
675 | * It writes the decoded data into the buffer pointed to by "dst", up to a | |
676 | * maximum of "dst_length", and returns the new value of "src" so that a | |
677 | * follow-on call can read more data, continuing from where the first left off. | |
678 | * | |
679 | * There are three types of results: | |
680 | * 1. The source data runs out before extracting "dst_length" bytes: | |
681 | * UnStuffData returns NULL to indicate failure. | |
682 | * 2. The source data produces exactly "dst_length" bytes: | |
683 | * UnStuffData returns new_src = end to indicate that all bytes were consumed. | |
684 | * 3. "dst_length" bytes are extracted, with more remaining. | |
685 | * UnStuffData returns new_src < end to indicate that there are more bytes | |
686 | * to be read. | |
687 | * | |
688 | * Note: The decoding may be destructive, in that it may alter the source | |
689 | * data in the process of decoding it (this is necessary to allow a follow-on | |
690 | * call to resume correctly). | |
691 | */ | |
692 | ||
693 | static __u8 *UnStuffData(__u8 * src, __u8 * end, __u8 * dst, | |
694 | __u32 dst_length) | |
695 | { | |
696 | __u8 *dst_end = dst + dst_length; | |
697 | /* Sanity check */ | |
698 | if (!src || !end || !dst || !dst_length) | |
699 | return (NULL); | |
700 | while (src < end && dst < dst_end) { | |
701 | int count = (*src ^ Stuff_Magic) & Stuff_CountMask; | |
702 | switch ((*src ^ Stuff_Magic) & Stuff_CodeMask) { | |
703 | case Stuff_Diff: | |
704 | if (src + 1 + count >= end) | |
705 | return (NULL); | |
706 | do { | |
707 | *dst++ = *++src ^ Stuff_Magic; | |
708 | } | |
709 | while (--count >= 0 && dst < dst_end); | |
710 | if (count < 0) | |
711 | src += 1; | |
712 | else { | |
713 | if (count == 0) | |
714 | *src = Stuff_Same ^ Stuff_Magic; | |
715 | else | |
716 | *src = | |
717 | (Stuff_Diff + | |
718 | count) ^ Stuff_Magic; | |
719 | } | |
720 | break; | |
721 | case Stuff_DiffZero: | |
722 | if (src + 1 + count >= end) | |
723 | return (NULL); | |
724 | do { | |
725 | *dst++ = *++src ^ Stuff_Magic; | |
726 | } | |
727 | while (--count >= 0 && dst < dst_end); | |
728 | if (count < 0) | |
729 | *src = Stuff_Zero ^ Stuff_Magic; | |
730 | else | |
731 | *src = | |
732 | (Stuff_DiffZero + count) ^ Stuff_Magic; | |
733 | break; | |
734 | case Stuff_Same: | |
735 | if (src + 1 >= end) | |
736 | return (NULL); | |
737 | do { | |
738 | *dst++ = src[1] ^ Stuff_Magic; | |
739 | } | |
740 | while (--count >= 0 && dst < dst_end); | |
741 | if (count < 0) | |
742 | src += 2; | |
743 | else | |
744 | *src = (Stuff_Same + count) ^ Stuff_Magic; | |
745 | break; | |
746 | case Stuff_Zero: | |
747 | do { | |
748 | *dst++ = 0; | |
749 | } | |
750 | while (--count >= 0 && dst < dst_end); | |
751 | if (count < 0) | |
752 | src += 1; | |
753 | else | |
754 | *src = (Stuff_Zero + count) ^ Stuff_Magic; | |
755 | break; | |
756 | } | |
757 | } | |
758 | if (dst < dst_end) | |
759 | return (NULL); | |
760 | else | |
761 | return (src); | |
762 | } | |
763 | ||
764 | ||
765 | /************************************************************************/ | |
766 | /* General routines for STRIP */ | |
767 | ||
768 | /* | |
769 | * get_baud returns the current baud rate, as one of the constants defined in | |
770 | * termbits.h | |
771 | * If the user has issued a baud rate override using the 'setserial' command | |
772 | * and the logical current rate is set to 38.4, then the true baud rate | |
773 | * currently in effect (57.6 or 115.2) is returned. | |
774 | */ | |
775 | static unsigned int get_baud(struct tty_struct *tty) | |
776 | { | |
777 | if (!tty || !tty->termios) | |
778 | return (0); | |
779 | if ((tty->termios->c_cflag & CBAUD) == B38400 && tty->driver_data) { | |
780 | struct async_struct *info = | |
781 | (struct async_struct *) tty->driver_data; | |
782 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
783 | return (B57600); | |
784 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
785 | return (B115200); | |
786 | } | |
787 | return (tty->termios->c_cflag & CBAUD); | |
788 | } | |
789 | ||
790 | /* | |
791 | * set_baud sets the baud rate to the rate defined by baudcode | |
792 | * Note: The rate B38400 should be avoided, because the user may have | |
793 | * issued a 'setserial' speed override to map that to a different speed. | |
794 | * We could achieve a true rate of 38400 if we needed to by cancelling | |
795 | * any user speed override that is in place, but that might annoy the | |
796 | * user, so it is simplest to just avoid using 38400. | |
797 | */ | |
798 | static void set_baud(struct tty_struct *tty, unsigned int baudcode) | |
799 | { | |
800 | struct termios old_termios = *(tty->termios); | |
801 | tty->termios->c_cflag &= ~CBAUD; /* Clear the old baud setting */ | |
802 | tty->termios->c_cflag |= baudcode; /* Set the new baud setting */ | |
803 | tty->driver->set_termios(tty, &old_termios); | |
804 | } | |
805 | ||
806 | /* | |
807 | * Convert a string to a Metricom Address. | |
808 | */ | |
809 | ||
810 | #define IS_RADIO_ADDRESS(p) ( \ | |
811 | isdigit((p)[0]) && isdigit((p)[1]) && isdigit((p)[2]) && isdigit((p)[3]) && \ | |
812 | (p)[4] == '-' && \ | |
813 | isdigit((p)[5]) && isdigit((p)[6]) && isdigit((p)[7]) && isdigit((p)[8]) ) | |
814 | ||
815 | static int string_to_radio_address(MetricomAddress * addr, __u8 * p) | |
816 | { | |
817 | if (!IS_RADIO_ADDRESS(p)) | |
818 | return (1); | |
819 | addr->c[0] = 0; | |
820 | addr->c[1] = 0; | |
821 | addr->c[2] = READHEX(p[0]) << 4 | READHEX(p[1]); | |
822 | addr->c[3] = READHEX(p[2]) << 4 | READHEX(p[3]); | |
823 | addr->c[4] = READHEX(p[5]) << 4 | READHEX(p[6]); | |
824 | addr->c[5] = READHEX(p[7]) << 4 | READHEX(p[8]); | |
825 | return (0); | |
826 | } | |
827 | ||
828 | /* | |
829 | * Convert a Metricom Address to a string. | |
830 | */ | |
831 | ||
832 | static __u8 *radio_address_to_string(const MetricomAddress * addr, | |
833 | MetricomAddressString * p) | |
834 | { | |
835 | sprintf(p->c, "%02X%02X-%02X%02X", addr->c[2], addr->c[3], | |
836 | addr->c[4], addr->c[5]); | |
837 | return (p->c); | |
838 | } | |
839 | ||
840 | /* | |
841 | * Note: Must make sure sx_size is big enough to receive a stuffed | |
842 | * MAX_RECV_MTU packet. Additionally, we also want to ensure that it's | |
843 | * big enough to receive a large radio neighbour list (currently 4K). | |
844 | */ | |
845 | ||
846 | static int allocate_buffers(struct strip *strip_info, int mtu) | |
847 | { | |
848 | struct net_device *dev = strip_info->dev; | |
849 | int sx_size = max_t(int, STRIP_ENCAP_SIZE(MAX_RECV_MTU), 4096); | |
850 | int tx_size = STRIP_ENCAP_SIZE(mtu) + MaxCommandStringLength; | |
851 | __u8 *r = kmalloc(MAX_RECV_MTU, GFP_ATOMIC); | |
852 | __u8 *s = kmalloc(sx_size, GFP_ATOMIC); | |
853 | __u8 *t = kmalloc(tx_size, GFP_ATOMIC); | |
854 | if (r && s && t) { | |
855 | strip_info->rx_buff = r; | |
856 | strip_info->sx_buff = s; | |
857 | strip_info->tx_buff = t; | |
858 | strip_info->sx_size = sx_size; | |
859 | strip_info->tx_size = tx_size; | |
860 | strip_info->mtu = dev->mtu = mtu; | |
861 | return (1); | |
862 | } | |
b4558ea9 JJ |
863 | kfree(r); |
864 | kfree(s); | |
865 | kfree(t); | |
1da177e4 LT |
866 | return (0); |
867 | } | |
868 | ||
869 | /* | |
870 | * MTU has been changed by the IP layer. | |
871 | * We could be in | |
872 | * an upcall from the tty driver, or in an ip packet queue. | |
873 | */ | |
874 | static int strip_change_mtu(struct net_device *dev, int new_mtu) | |
875 | { | |
876 | struct strip *strip_info = netdev_priv(dev); | |
877 | int old_mtu = strip_info->mtu; | |
878 | unsigned char *orbuff = strip_info->rx_buff; | |
879 | unsigned char *osbuff = strip_info->sx_buff; | |
880 | unsigned char *otbuff = strip_info->tx_buff; | |
881 | ||
882 | if (new_mtu > MAX_SEND_MTU) { | |
883 | printk(KERN_ERR | |
884 | "%s: MTU exceeds maximum allowable (%d), MTU change cancelled.\n", | |
885 | strip_info->dev->name, MAX_SEND_MTU); | |
886 | return -EINVAL; | |
887 | } | |
888 | ||
889 | spin_lock_bh(&strip_lock); | |
890 | if (!allocate_buffers(strip_info, new_mtu)) { | |
891 | printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n", | |
892 | strip_info->dev->name); | |
893 | spin_unlock_bh(&strip_lock); | |
894 | return -ENOMEM; | |
895 | } | |
896 | ||
897 | if (strip_info->sx_count) { | |
898 | if (strip_info->sx_count <= strip_info->sx_size) | |
899 | memcpy(strip_info->sx_buff, osbuff, | |
900 | strip_info->sx_count); | |
901 | else { | |
902 | strip_info->discard = strip_info->sx_count; | |
903 | strip_info->rx_over_errors++; | |
904 | } | |
905 | } | |
906 | ||
907 | if (strip_info->tx_left) { | |
908 | if (strip_info->tx_left <= strip_info->tx_size) | |
909 | memcpy(strip_info->tx_buff, strip_info->tx_head, | |
910 | strip_info->tx_left); | |
911 | else { | |
912 | strip_info->tx_left = 0; | |
913 | strip_info->tx_dropped++; | |
914 | } | |
915 | } | |
916 | strip_info->tx_head = strip_info->tx_buff; | |
917 | spin_unlock_bh(&strip_lock); | |
918 | ||
919 | printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n", | |
920 | strip_info->dev->name, old_mtu, strip_info->mtu); | |
921 | ||
b4558ea9 JJ |
922 | kfree(orbuff); |
923 | kfree(osbuff); | |
924 | kfree(otbuff); | |
1da177e4 LT |
925 | return 0; |
926 | } | |
927 | ||
928 | static void strip_unlock(struct strip *strip_info) | |
929 | { | |
930 | /* | |
931 | * Set the timer to go off in one second. | |
932 | */ | |
933 | strip_info->idle_timer.expires = jiffies + 1 * HZ; | |
934 | add_timer(&strip_info->idle_timer); | |
935 | netif_wake_queue(strip_info->dev); | |
936 | } | |
937 | ||
938 | ||
939 | ||
940 | /* | |
941 | * If the time is in the near future, time_delta prints the number of | |
942 | * seconds to go into the buffer and returns the address of the buffer. | |
943 | * If the time is not in the near future, it returns the address of the | |
944 | * string "Not scheduled" The buffer must be long enough to contain the | |
945 | * ascii representation of the number plus 9 charactes for the " seconds" | |
946 | * and the null character. | |
947 | */ | |
948 | #ifdef CONFIG_PROC_FS | |
949 | static char *time_delta(char buffer[], long time) | |
950 | { | |
951 | time -= jiffies; | |
952 | if (time > LongTime / 2) | |
953 | return ("Not scheduled"); | |
954 | if (time < 0) | |
955 | time = 0; /* Don't print negative times */ | |
956 | sprintf(buffer, "%ld seconds", time / HZ); | |
957 | return (buffer); | |
958 | } | |
959 | ||
960 | /* get Nth element of the linked list */ | |
961 | static struct strip *strip_get_idx(loff_t pos) | |
962 | { | |
963 | struct list_head *l; | |
964 | int i = 0; | |
965 | ||
966 | list_for_each_rcu(l, &strip_list) { | |
967 | if (pos == i) | |
968 | return list_entry(l, struct strip, list); | |
969 | ++i; | |
970 | } | |
971 | return NULL; | |
972 | } | |
973 | ||
974 | static void *strip_seq_start(struct seq_file *seq, loff_t *pos) | |
975 | { | |
976 | rcu_read_lock(); | |
977 | return *pos ? strip_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
978 | } | |
979 | ||
980 | static void *strip_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
981 | { | |
982 | struct list_head *l; | |
983 | struct strip *s; | |
984 | ||
985 | ++*pos; | |
986 | if (v == SEQ_START_TOKEN) | |
987 | return strip_get_idx(1); | |
988 | ||
989 | s = v; | |
990 | l = &s->list; | |
991 | list_for_each_continue_rcu(l, &strip_list) { | |
992 | return list_entry(l, struct strip, list); | |
993 | } | |
994 | return NULL; | |
995 | } | |
996 | ||
997 | static void strip_seq_stop(struct seq_file *seq, void *v) | |
998 | { | |
999 | rcu_read_unlock(); | |
1000 | } | |
1001 | ||
1002 | static void strip_seq_neighbours(struct seq_file *seq, | |
1003 | const MetricomNodeTable * table, | |
1004 | const char *title) | |
1005 | { | |
1006 | /* We wrap this in a do/while loop, so if the table changes */ | |
1007 | /* while we're reading it, we just go around and try again. */ | |
1008 | struct timeval t; | |
1009 | ||
1010 | do { | |
1011 | int i; | |
1012 | t = table->timestamp; | |
1013 | if (table->num_nodes) | |
1014 | seq_printf(seq, "\n %s\n", title); | |
1015 | for (i = 0; i < table->num_nodes; i++) { | |
1016 | MetricomNode node; | |
1017 | ||
1018 | spin_lock_bh(&strip_lock); | |
1019 | node = table->node[i]; | |
1020 | spin_unlock_bh(&strip_lock); | |
1021 | seq_printf(seq, " %s\n", node.c); | |
1022 | } | |
1023 | } while (table->timestamp.tv_sec != t.tv_sec | |
1024 | || table->timestamp.tv_usec != t.tv_usec); | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * This function prints radio status information via the seq_file | |
1029 | * interface. The interface takes care of buffer size and over | |
1030 | * run issues. | |
1031 | * | |
1032 | * The buffer in seq_file is PAGESIZE (4K) | |
1033 | * so this routine should never print more or it will get truncated. | |
1034 | * With the maximum of 32 portables and 32 poletops | |
1035 | * reported, the routine outputs 3107 bytes into the buffer. | |
1036 | */ | |
1037 | static void strip_seq_status_info(struct seq_file *seq, | |
1038 | const struct strip *strip_info) | |
1039 | { | |
1040 | char temp[32]; | |
1041 | MetricomAddressString addr_string; | |
1042 | ||
1043 | /* First, we must copy all of our data to a safe place, */ | |
1044 | /* in case a serial interrupt comes in and changes it. */ | |
1045 | int tx_left = strip_info->tx_left; | |
1046 | unsigned long rx_average_pps = strip_info->rx_average_pps; | |
1047 | unsigned long tx_average_pps = strip_info->tx_average_pps; | |
1048 | unsigned long sx_average_pps = strip_info->sx_average_pps; | |
1049 | int working = strip_info->working; | |
1050 | int firmware_level = strip_info->firmware_level; | |
1051 | long watchdog_doprobe = strip_info->watchdog_doprobe; | |
1052 | long watchdog_doreset = strip_info->watchdog_doreset; | |
1053 | long gratuitous_arp = strip_info->gratuitous_arp; | |
1054 | long arp_interval = strip_info->arp_interval; | |
1055 | FirmwareVersion firmware_version = strip_info->firmware_version; | |
1056 | SerialNumber serial_number = strip_info->serial_number; | |
1057 | BatteryVoltage battery_voltage = strip_info->battery_voltage; | |
1058 | char *if_name = strip_info->dev->name; | |
1059 | MetricomAddress true_dev_addr = strip_info->true_dev_addr; | |
1060 | MetricomAddress dev_dev_addr = | |
1061 | *(MetricomAddress *) strip_info->dev->dev_addr; | |
1062 | int manual_dev_addr = strip_info->manual_dev_addr; | |
1063 | #ifdef EXT_COUNTERS | |
1064 | unsigned long rx_bytes = strip_info->rx_bytes; | |
1065 | unsigned long tx_bytes = strip_info->tx_bytes; | |
1066 | unsigned long rx_rbytes = strip_info->rx_rbytes; | |
1067 | unsigned long tx_rbytes = strip_info->tx_rbytes; | |
1068 | unsigned long rx_sbytes = strip_info->rx_sbytes; | |
1069 | unsigned long tx_sbytes = strip_info->tx_sbytes; | |
1070 | unsigned long rx_ebytes = strip_info->rx_ebytes; | |
1071 | unsigned long tx_ebytes = strip_info->tx_ebytes; | |
1072 | #endif | |
1073 | ||
1074 | seq_printf(seq, "\nInterface name\t\t%s\n", if_name); | |
1075 | seq_printf(seq, " Radio working:\t\t%s\n", working ? "Yes" : "No"); | |
1076 | radio_address_to_string(&true_dev_addr, &addr_string); | |
1077 | seq_printf(seq, " Radio address:\t\t%s\n", addr_string.c); | |
1078 | if (manual_dev_addr) { | |
1079 | radio_address_to_string(&dev_dev_addr, &addr_string); | |
1080 | seq_printf(seq, " Device address:\t%s\n", addr_string.c); | |
1081 | } | |
1082 | seq_printf(seq, " Firmware version:\t%s", !working ? "Unknown" : | |
1083 | !firmware_level ? "Should be upgraded" : | |
1084 | firmware_version.c); | |
1085 | if (firmware_level >= ChecksummedMessages) | |
1086 | seq_printf(seq, " (Checksums Enabled)"); | |
1087 | seq_printf(seq, "\n"); | |
1088 | seq_printf(seq, " Serial number:\t\t%s\n", serial_number.c); | |
1089 | seq_printf(seq, " Battery voltage:\t%s\n", battery_voltage.c); | |
1090 | seq_printf(seq, " Transmit queue (bytes):%d\n", tx_left); | |
1091 | seq_printf(seq, " Receive packet rate: %ld packets per second\n", | |
1092 | rx_average_pps / 8); | |
1093 | seq_printf(seq, " Transmit packet rate: %ld packets per second\n", | |
1094 | tx_average_pps / 8); | |
1095 | seq_printf(seq, " Sent packet rate: %ld packets per second\n", | |
1096 | sx_average_pps / 8); | |
1097 | seq_printf(seq, " Next watchdog probe:\t%s\n", | |
1098 | time_delta(temp, watchdog_doprobe)); | |
1099 | seq_printf(seq, " Next watchdog reset:\t%s\n", | |
1100 | time_delta(temp, watchdog_doreset)); | |
1101 | seq_printf(seq, " Next gratuitous ARP:\t"); | |
1102 | ||
1103 | if (!memcmp | |
1104 | (strip_info->dev->dev_addr, zero_address.c, | |
1105 | sizeof(zero_address))) | |
1106 | seq_printf(seq, "Disabled\n"); | |
1107 | else { | |
1108 | seq_printf(seq, "%s\n", time_delta(temp, gratuitous_arp)); | |
1109 | seq_printf(seq, " Next ARP interval:\t%ld seconds\n", | |
1110 | JIFFIE_TO_SEC(arp_interval)); | |
1111 | } | |
1112 | ||
1113 | if (working) { | |
1114 | #ifdef EXT_COUNTERS | |
1115 | seq_printf(seq, "\n"); | |
1116 | seq_printf(seq, | |
1117 | " Total bytes: \trx:\t%lu\ttx:\t%lu\n", | |
1118 | rx_bytes, tx_bytes); | |
1119 | seq_printf(seq, | |
1120 | " thru radio: \trx:\t%lu\ttx:\t%lu\n", | |
1121 | rx_rbytes, tx_rbytes); | |
1122 | seq_printf(seq, | |
1123 | " thru serial port: \trx:\t%lu\ttx:\t%lu\n", | |
1124 | rx_sbytes, tx_sbytes); | |
1125 | seq_printf(seq, | |
1126 | " Total stat/err bytes:\trx:\t%lu\ttx:\t%lu\n", | |
1127 | rx_ebytes, tx_ebytes); | |
1128 | #endif | |
1129 | strip_seq_neighbours(seq, &strip_info->poletops, | |
1130 | "Poletops:"); | |
1131 | strip_seq_neighbours(seq, &strip_info->portables, | |
1132 | "Portables:"); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * This function is exports status information from the STRIP driver through | |
1138 | * the /proc file system. | |
1139 | */ | |
1140 | static int strip_seq_show(struct seq_file *seq, void *v) | |
1141 | { | |
1142 | if (v == SEQ_START_TOKEN) | |
1143 | seq_printf(seq, "strip_version: %s\n", StripVersion); | |
1144 | else | |
1145 | strip_seq_status_info(seq, (const struct strip *)v); | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | ||
1150 | static struct seq_operations strip_seq_ops = { | |
1151 | .start = strip_seq_start, | |
1152 | .next = strip_seq_next, | |
1153 | .stop = strip_seq_stop, | |
1154 | .show = strip_seq_show, | |
1155 | }; | |
1156 | ||
1157 | static int strip_seq_open(struct inode *inode, struct file *file) | |
1158 | { | |
1159 | return seq_open(file, &strip_seq_ops); | |
1160 | } | |
1161 | ||
1162 | static struct file_operations strip_seq_fops = { | |
1163 | .owner = THIS_MODULE, | |
1164 | .open = strip_seq_open, | |
1165 | .read = seq_read, | |
1166 | .llseek = seq_lseek, | |
1167 | .release = seq_release, | |
1168 | }; | |
1169 | #endif | |
1170 | ||
1171 | ||
1172 | ||
1173 | /************************************************************************/ | |
1174 | /* Sending routines */ | |
1175 | ||
1176 | static void ResetRadio(struct strip *strip_info) | |
1177 | { | |
1178 | struct tty_struct *tty = strip_info->tty; | |
1179 | static const char init[] = "ate0q1dt**starmode\r**"; | |
1180 | StringDescriptor s = { init, sizeof(init) - 1 }; | |
1181 | ||
1182 | /* | |
1183 | * If the radio isn't working anymore, | |
1184 | * we should clear the old status information. | |
1185 | */ | |
1186 | if (strip_info->working) { | |
1187 | printk(KERN_INFO "%s: No response: Resetting radio.\n", | |
1188 | strip_info->dev->name); | |
1189 | strip_info->firmware_version.c[0] = '\0'; | |
1190 | strip_info->serial_number.c[0] = '\0'; | |
1191 | strip_info->battery_voltage.c[0] = '\0'; | |
1192 | strip_info->portables.num_nodes = 0; | |
1193 | do_gettimeofday(&strip_info->portables.timestamp); | |
1194 | strip_info->poletops.num_nodes = 0; | |
1195 | do_gettimeofday(&strip_info->poletops.timestamp); | |
1196 | } | |
1197 | ||
1198 | strip_info->pps_timer = jiffies; | |
1199 | strip_info->rx_pps_count = 0; | |
1200 | strip_info->tx_pps_count = 0; | |
1201 | strip_info->sx_pps_count = 0; | |
1202 | strip_info->rx_average_pps = 0; | |
1203 | strip_info->tx_average_pps = 0; | |
1204 | strip_info->sx_average_pps = 0; | |
1205 | ||
1206 | /* Mark radio address as unknown */ | |
1207 | *(MetricomAddress *) & strip_info->true_dev_addr = zero_address; | |
1208 | if (!strip_info->manual_dev_addr) | |
1209 | *(MetricomAddress *) strip_info->dev->dev_addr = | |
1210 | zero_address; | |
1211 | strip_info->working = FALSE; | |
1212 | strip_info->firmware_level = NoStructure; | |
1213 | strip_info->next_command = CompatibilityCommand; | |
1214 | strip_info->watchdog_doprobe = jiffies + 10 * HZ; | |
1215 | strip_info->watchdog_doreset = jiffies + 1 * HZ; | |
1216 | ||
1217 | /* If the user has selected a baud rate above 38.4 see what magic we have to do */ | |
1218 | if (strip_info->user_baud > B38400) { | |
1219 | /* | |
1220 | * Subtle stuff: Pay attention :-) | |
1221 | * If the serial port is currently at the user's selected (>38.4) rate, | |
1222 | * then we temporarily switch to 19.2 and issue the ATS304 command | |
1223 | * to tell the radio to switch to the user's selected rate. | |
1224 | * If the serial port is not currently at that rate, that means we just | |
1225 | * issued the ATS304 command last time through, so this time we restore | |
1226 | * the user's selected rate and issue the normal starmode reset string. | |
1227 | */ | |
1228 | if (strip_info->user_baud == get_baud(tty)) { | |
1229 | static const char b0[] = "ate0q1s304=57600\r"; | |
1230 | static const char b1[] = "ate0q1s304=115200\r"; | |
1231 | static const StringDescriptor baudstring[2] = | |
1232 | { {b0, sizeof(b0) - 1} | |
1233 | , {b1, sizeof(b1) - 1} | |
1234 | }; | |
1235 | set_baud(tty, B19200); | |
1236 | if (strip_info->user_baud == B57600) | |
1237 | s = baudstring[0]; | |
1238 | else if (strip_info->user_baud == B115200) | |
1239 | s = baudstring[1]; | |
1240 | else | |
1241 | s = baudstring[1]; /* For now */ | |
1242 | } else | |
1243 | set_baud(tty, strip_info->user_baud); | |
1244 | } | |
1245 | ||
1246 | tty->driver->write(tty, s.string, s.length); | |
1247 | #ifdef EXT_COUNTERS | |
1248 | strip_info->tx_ebytes += s.length; | |
1249 | #endif | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Called by the driver when there's room for more data. If we have | |
1254 | * more packets to send, we send them here. | |
1255 | */ | |
1256 | ||
1257 | static void strip_write_some_more(struct tty_struct *tty) | |
1258 | { | |
1259 | struct strip *strip_info = (struct strip *) tty->disc_data; | |
1260 | ||
1261 | /* First make sure we're connected. */ | |
1262 | if (!strip_info || strip_info->magic != STRIP_MAGIC || | |
1263 | !netif_running(strip_info->dev)) | |
1264 | return; | |
1265 | ||
1266 | if (strip_info->tx_left > 0) { | |
1267 | int num_written = | |
1268 | tty->driver->write(tty, strip_info->tx_head, | |
1269 | strip_info->tx_left); | |
1270 | strip_info->tx_left -= num_written; | |
1271 | strip_info->tx_head += num_written; | |
1272 | #ifdef EXT_COUNTERS | |
1273 | strip_info->tx_sbytes += num_written; | |
1274 | #endif | |
1275 | } else { /* Else start transmission of another packet */ | |
1276 | ||
1277 | tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
1278 | strip_unlock(strip_info); | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | static __u8 *add_checksum(__u8 * buffer, __u8 * end) | |
1283 | { | |
1284 | __u16 sum = 0; | |
1285 | __u8 *p = buffer; | |
1286 | while (p < end) | |
1287 | sum += *p++; | |
1288 | end[3] = hextable[sum & 0xF]; | |
1289 | sum >>= 4; | |
1290 | end[2] = hextable[sum & 0xF]; | |
1291 | sum >>= 4; | |
1292 | end[1] = hextable[sum & 0xF]; | |
1293 | sum >>= 4; | |
1294 | end[0] = hextable[sum & 0xF]; | |
1295 | return (end + 4); | |
1296 | } | |
1297 | ||
1298 | static unsigned char *strip_make_packet(unsigned char *buffer, | |
1299 | struct strip *strip_info, | |
1300 | struct sk_buff *skb) | |
1301 | { | |
1302 | __u8 *ptr = buffer; | |
1303 | __u8 *stuffstate = NULL; | |
1304 | STRIP_Header *header = (STRIP_Header *) skb->data; | |
1305 | MetricomAddress haddr = header->dst_addr; | |
1306 | int len = skb->len - sizeof(STRIP_Header); | |
1307 | MetricomKey key; | |
1308 | ||
1309 | /*HexDump("strip_make_packet", strip_info, skb->data, skb->data + skb->len); */ | |
1310 | ||
1311 | if (header->protocol == htons(ETH_P_IP)) | |
1312 | key = SIP0Key; | |
1313 | else if (header->protocol == htons(ETH_P_ARP)) | |
1314 | key = ARP0Key; | |
1315 | else { | |
1316 | printk(KERN_ERR | |
1317 | "%s: strip_make_packet: Unknown packet type 0x%04X\n", | |
1318 | strip_info->dev->name, ntohs(header->protocol)); | |
1319 | return (NULL); | |
1320 | } | |
1321 | ||
1322 | if (len > strip_info->mtu) { | |
1323 | printk(KERN_ERR | |
1324 | "%s: Dropping oversized transmit packet: %d bytes\n", | |
1325 | strip_info->dev->name, len); | |
1326 | return (NULL); | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * If we're sending to ourselves, discard the packet. | |
1331 | * (Metricom radios choke if they try to send a packet to their own address.) | |
1332 | */ | |
1333 | if (!memcmp(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) { | |
1334 | printk(KERN_ERR "%s: Dropping packet addressed to self\n", | |
1335 | strip_info->dev->name); | |
1336 | return (NULL); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * If this is a broadcast packet, send it to our designated Metricom | |
1341 | * 'broadcast hub' radio (First byte of address being 0xFF means broadcast) | |
1342 | */ | |
1343 | if (haddr.c[0] == 0xFF) { | |
1344 | u32 brd = 0; | |
1345 | struct in_device *in_dev; | |
1346 | ||
1347 | rcu_read_lock(); | |
e5ed6399 | 1348 | in_dev = __in_dev_get_rcu(strip_info->dev); |
1da177e4 LT |
1349 | if (in_dev == NULL) { |
1350 | rcu_read_unlock(); | |
1351 | return NULL; | |
1352 | } | |
1353 | if (in_dev->ifa_list) | |
1354 | brd = in_dev->ifa_list->ifa_broadcast; | |
1355 | rcu_read_unlock(); | |
1356 | ||
1357 | /* arp_query returns 1 if it succeeds in looking up the address, 0 if it fails */ | |
1358 | if (!arp_query(haddr.c, brd, strip_info->dev)) { | |
1359 | printk(KERN_ERR | |
1360 | "%s: Unable to send packet (no broadcast hub configured)\n", | |
1361 | strip_info->dev->name); | |
1362 | return (NULL); | |
1363 | } | |
1364 | /* | |
1365 | * If we are the broadcast hub, don't bother sending to ourselves. | |
1366 | * (Metricom radios choke if they try to send a packet to their own address.) | |
1367 | */ | |
1368 | if (!memcmp | |
1369 | (haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) | |
1370 | return (NULL); | |
1371 | } | |
1372 | ||
1373 | *ptr++ = 0x0D; | |
1374 | *ptr++ = '*'; | |
1375 | *ptr++ = hextable[haddr.c[2] >> 4]; | |
1376 | *ptr++ = hextable[haddr.c[2] & 0xF]; | |
1377 | *ptr++ = hextable[haddr.c[3] >> 4]; | |
1378 | *ptr++ = hextable[haddr.c[3] & 0xF]; | |
1379 | *ptr++ = '-'; | |
1380 | *ptr++ = hextable[haddr.c[4] >> 4]; | |
1381 | *ptr++ = hextable[haddr.c[4] & 0xF]; | |
1382 | *ptr++ = hextable[haddr.c[5] >> 4]; | |
1383 | *ptr++ = hextable[haddr.c[5] & 0xF]; | |
1384 | *ptr++ = '*'; | |
1385 | *ptr++ = key.c[0]; | |
1386 | *ptr++ = key.c[1]; | |
1387 | *ptr++ = key.c[2]; | |
1388 | *ptr++ = key.c[3]; | |
1389 | ||
1390 | ptr = | |
1391 | StuffData(skb->data + sizeof(STRIP_Header), len, ptr, | |
1392 | &stuffstate); | |
1393 | ||
1394 | if (strip_info->firmware_level >= ChecksummedMessages) | |
1395 | ptr = add_checksum(buffer + 1, ptr); | |
1396 | ||
1397 | *ptr++ = 0x0D; | |
1398 | return (ptr); | |
1399 | } | |
1400 | ||
1401 | static void strip_send(struct strip *strip_info, struct sk_buff *skb) | |
1402 | { | |
1403 | MetricomAddress haddr; | |
1404 | unsigned char *ptr = strip_info->tx_buff; | |
1405 | int doreset = (long) jiffies - strip_info->watchdog_doreset >= 0; | |
1406 | int doprobe = (long) jiffies - strip_info->watchdog_doprobe >= 0 | |
1407 | && !doreset; | |
1408 | u32 addr, brd; | |
1409 | ||
1410 | /* | |
1411 | * 1. If we have a packet, encapsulate it and put it in the buffer | |
1412 | */ | |
1413 | if (skb) { | |
1414 | char *newptr = strip_make_packet(ptr, strip_info, skb); | |
1415 | strip_info->tx_pps_count++; | |
1416 | if (!newptr) | |
1417 | strip_info->tx_dropped++; | |
1418 | else { | |
1419 | ptr = newptr; | |
1420 | strip_info->sx_pps_count++; | |
1421 | strip_info->tx_packets++; /* Count another successful packet */ | |
1422 | #ifdef EXT_COUNTERS | |
1423 | strip_info->tx_bytes += skb->len; | |
1424 | strip_info->tx_rbytes += ptr - strip_info->tx_buff; | |
1425 | #endif | |
1426 | /*DumpData("Sending:", strip_info, strip_info->tx_buff, ptr); */ | |
1427 | /*HexDump("Sending", strip_info, strip_info->tx_buff, ptr); */ | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * 2. If it is time for another tickle, tack it on, after the packet | |
1433 | */ | |
1434 | if (doprobe) { | |
1435 | StringDescriptor ts = CommandString[strip_info->next_command]; | |
1436 | #if TICKLE_TIMERS | |
1437 | { | |
1438 | struct timeval tv; | |
1439 | do_gettimeofday(&tv); | |
1440 | printk(KERN_INFO "**** Sending tickle string %d at %02d.%06d\n", | |
1441 | strip_info->next_command, tv.tv_sec % 100, | |
1442 | tv.tv_usec); | |
1443 | } | |
1444 | #endif | |
1445 | if (ptr == strip_info->tx_buff) | |
1446 | *ptr++ = 0x0D; | |
1447 | ||
1448 | *ptr++ = '*'; /* First send "**" to provoke an error message */ | |
1449 | *ptr++ = '*'; | |
1450 | ||
1451 | /* Then add the command */ | |
1452 | memcpy(ptr, ts.string, ts.length); | |
1453 | ||
1454 | /* Add a checksum ? */ | |
1455 | if (strip_info->firmware_level < ChecksummedMessages) | |
1456 | ptr += ts.length; | |
1457 | else | |
1458 | ptr = add_checksum(ptr, ptr + ts.length); | |
1459 | ||
1460 | *ptr++ = 0x0D; /* Terminate the command with a <CR> */ | |
1461 | ||
1462 | /* Cycle to next periodic command? */ | |
1463 | if (strip_info->firmware_level >= StructuredMessages) | |
1464 | if (++strip_info->next_command >= | |
1465 | ARRAY_SIZE(CommandString)) | |
1466 | strip_info->next_command = 0; | |
1467 | #ifdef EXT_COUNTERS | |
1468 | strip_info->tx_ebytes += ts.length; | |
1469 | #endif | |
1470 | strip_info->watchdog_doprobe = jiffies + 10 * HZ; | |
1471 | strip_info->watchdog_doreset = jiffies + 1 * HZ; | |
1472 | /*printk(KERN_INFO "%s: Routine radio test.\n", strip_info->dev->name); */ | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * 3. Set up the strip_info ready to send the data (if any). | |
1477 | */ | |
1478 | strip_info->tx_head = strip_info->tx_buff; | |
1479 | strip_info->tx_left = ptr - strip_info->tx_buff; | |
1480 | strip_info->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); | |
1481 | ||
1482 | /* | |
1483 | * 4. Debugging check to make sure we're not overflowing the buffer. | |
1484 | */ | |
1485 | if (strip_info->tx_size - strip_info->tx_left < 20) | |
1486 | printk(KERN_ERR "%s: Sending%5d bytes;%5d bytes free.\n", | |
1487 | strip_info->dev->name, strip_info->tx_left, | |
1488 | strip_info->tx_size - strip_info->tx_left); | |
1489 | ||
1490 | /* | |
1491 | * 5. If watchdog has expired, reset the radio. Note: if there's data waiting in | |
1492 | * the buffer, strip_write_some_more will send it after the reset has finished | |
1493 | */ | |
1494 | if (doreset) { | |
1495 | ResetRadio(strip_info); | |
1496 | return; | |
1497 | } | |
1498 | ||
1499 | if (1) { | |
1500 | struct in_device *in_dev; | |
1501 | ||
1502 | brd = addr = 0; | |
1503 | rcu_read_lock(); | |
e5ed6399 | 1504 | in_dev = __in_dev_get_rcu(strip_info->dev); |
1da177e4 LT |
1505 | if (in_dev) { |
1506 | if (in_dev->ifa_list) { | |
1507 | brd = in_dev->ifa_list->ifa_broadcast; | |
1508 | addr = in_dev->ifa_list->ifa_local; | |
1509 | } | |
1510 | } | |
1511 | rcu_read_unlock(); | |
1512 | } | |
1513 | ||
1514 | ||
1515 | /* | |
1516 | * 6. If it is time for a periodic ARP, queue one up to be sent. | |
1517 | * We only do this if: | |
1518 | * 1. The radio is working | |
1519 | * 2. It's time to send another periodic ARP | |
1520 | * 3. We really know what our address is (and it is not manually set to zero) | |
1521 | * 4. We have a designated broadcast address configured | |
1522 | * If we queue up an ARP packet when we don't have a designated broadcast | |
1523 | * address configured, then the packet will just have to be discarded in | |
1524 | * strip_make_packet. This is not fatal, but it causes misleading information | |
1525 | * to be displayed in tcpdump. tcpdump will report that periodic APRs are | |
1526 | * being sent, when in fact they are not, because they are all being dropped | |
1527 | * in the strip_make_packet routine. | |
1528 | */ | |
1529 | if (strip_info->working | |
1530 | && (long) jiffies - strip_info->gratuitous_arp >= 0 | |
1531 | && memcmp(strip_info->dev->dev_addr, zero_address.c, | |
1532 | sizeof(zero_address)) | |
1533 | && arp_query(haddr.c, brd, strip_info->dev)) { | |
1534 | /*printk(KERN_INFO "%s: Sending gratuitous ARP with interval %ld\n", | |
1535 | strip_info->dev->name, strip_info->arp_interval / HZ); */ | |
1536 | strip_info->gratuitous_arp = | |
1537 | jiffies + strip_info->arp_interval; | |
1538 | strip_info->arp_interval *= 2; | |
1539 | if (strip_info->arp_interval > MaxARPInterval) | |
1540 | strip_info->arp_interval = MaxARPInterval; | |
1541 | if (addr) | |
1542 | arp_send(ARPOP_REPLY, ETH_P_ARP, addr, /* Target address of ARP packet is our address */ | |
1543 | strip_info->dev, /* Device to send packet on */ | |
1544 | addr, /* Source IP address this ARP packet comes from */ | |
1545 | NULL, /* Destination HW address is NULL (broadcast it) */ | |
1546 | strip_info->dev->dev_addr, /* Source HW address is our HW address */ | |
1547 | strip_info->dev->dev_addr); /* Target HW address is our HW address (redundant) */ | |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * 7. All ready. Start the transmission | |
1552 | */ | |
1553 | strip_write_some_more(strip_info->tty); | |
1554 | } | |
1555 | ||
1556 | /* Encapsulate a datagram and kick it into a TTY queue. */ | |
1557 | static int strip_xmit(struct sk_buff *skb, struct net_device *dev) | |
1558 | { | |
1559 | struct strip *strip_info = netdev_priv(dev); | |
1560 | ||
1561 | if (!netif_running(dev)) { | |
1562 | printk(KERN_ERR "%s: xmit call when iface is down\n", | |
1563 | dev->name); | |
1564 | return (1); | |
1565 | } | |
1566 | ||
1567 | netif_stop_queue(dev); | |
1568 | ||
1569 | del_timer(&strip_info->idle_timer); | |
1570 | ||
1571 | ||
1572 | if (jiffies - strip_info->pps_timer > HZ) { | |
1573 | unsigned long t = jiffies - strip_info->pps_timer; | |
1574 | unsigned long rx_pps_count = (strip_info->rx_pps_count * HZ * 8 + t / 2) / t; | |
1575 | unsigned long tx_pps_count = (strip_info->tx_pps_count * HZ * 8 + t / 2) / t; | |
1576 | unsigned long sx_pps_count = (strip_info->sx_pps_count * HZ * 8 + t / 2) / t; | |
1577 | ||
1578 | strip_info->pps_timer = jiffies; | |
1579 | strip_info->rx_pps_count = 0; | |
1580 | strip_info->tx_pps_count = 0; | |
1581 | strip_info->sx_pps_count = 0; | |
1582 | ||
1583 | strip_info->rx_average_pps = (strip_info->rx_average_pps + rx_pps_count + 1) / 2; | |
1584 | strip_info->tx_average_pps = (strip_info->tx_average_pps + tx_pps_count + 1) / 2; | |
1585 | strip_info->sx_average_pps = (strip_info->sx_average_pps + sx_pps_count + 1) / 2; | |
1586 | ||
1587 | if (rx_pps_count / 8 >= 10) | |
1588 | printk(KERN_INFO "%s: WARNING: Receiving %ld packets per second.\n", | |
1589 | strip_info->dev->name, rx_pps_count / 8); | |
1590 | if (tx_pps_count / 8 >= 10) | |
1591 | printk(KERN_INFO "%s: WARNING: Tx %ld packets per second.\n", | |
1592 | strip_info->dev->name, tx_pps_count / 8); | |
1593 | if (sx_pps_count / 8 >= 10) | |
1594 | printk(KERN_INFO "%s: WARNING: Sending %ld packets per second.\n", | |
1595 | strip_info->dev->name, sx_pps_count / 8); | |
1596 | } | |
1597 | ||
1598 | spin_lock_bh(&strip_lock); | |
1599 | ||
1600 | strip_send(strip_info, skb); | |
1601 | ||
1602 | spin_unlock_bh(&strip_lock); | |
1603 | ||
1604 | if (skb) | |
1605 | dev_kfree_skb(skb); | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * IdleTask periodically calls strip_xmit, so even when we have no IP packets | |
1611 | * to send for an extended period of time, the watchdog processing still gets | |
1612 | * done to ensure that the radio stays in Starmode | |
1613 | */ | |
1614 | ||
1615 | static void strip_IdleTask(unsigned long parameter) | |
1616 | { | |
1617 | strip_xmit(NULL, (struct net_device *) parameter); | |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Create the MAC header for an arbitrary protocol layer | |
1622 | * | |
1623 | * saddr!=NULL means use this specific address (n/a for Metricom) | |
1624 | * saddr==NULL means use default device source address | |
1625 | * daddr!=NULL means use this destination address | |
1626 | * daddr==NULL means leave destination address alone | |
1627 | * (e.g. unresolved arp -- kernel will call | |
1628 | * rebuild_header later to fill in the address) | |
1629 | */ | |
1630 | ||
1631 | static int strip_header(struct sk_buff *skb, struct net_device *dev, | |
1632 | unsigned short type, void *daddr, void *saddr, | |
1633 | unsigned len) | |
1634 | { | |
1635 | struct strip *strip_info = netdev_priv(dev); | |
1636 | STRIP_Header *header = (STRIP_Header *) skb_push(skb, sizeof(STRIP_Header)); | |
1637 | ||
1638 | /*printk(KERN_INFO "%s: strip_header 0x%04X %s\n", dev->name, type, | |
1639 | type == ETH_P_IP ? "IP" : type == ETH_P_ARP ? "ARP" : ""); */ | |
1640 | ||
1641 | header->src_addr = strip_info->true_dev_addr; | |
1642 | header->protocol = htons(type); | |
1643 | ||
1644 | /*HexDump("strip_header", netdev_priv(dev), skb->data, skb->data + skb->len); */ | |
1645 | ||
1646 | if (!daddr) | |
1647 | return (-dev->hard_header_len); | |
1648 | ||
1649 | header->dst_addr = *(MetricomAddress *) daddr; | |
1650 | return (dev->hard_header_len); | |
1651 | } | |
1652 | ||
1653 | /* | |
1654 | * Rebuild the MAC header. This is called after an ARP | |
1655 | * (or in future other address resolution) has completed on this | |
1656 | * sk_buff. We now let ARP fill in the other fields. | |
1657 | * I think this should return zero if packet is ready to send, | |
1658 | * or non-zero if it needs more time to do an address lookup | |
1659 | */ | |
1660 | ||
1661 | static int strip_rebuild_header(struct sk_buff *skb) | |
1662 | { | |
1663 | #ifdef CONFIG_INET | |
1664 | STRIP_Header *header = (STRIP_Header *) skb->data; | |
1665 | ||
1666 | /* Arp find returns zero if if knows the address, */ | |
1667 | /* or if it doesn't know the address it sends an ARP packet and returns non-zero */ | |
1668 | return arp_find(header->dst_addr.c, skb) ? 1 : 0; | |
1669 | #else | |
1670 | return 0; | |
1671 | #endif | |
1672 | } | |
1673 | ||
1674 | ||
1675 | /************************************************************************/ | |
1676 | /* Receiving routines */ | |
1677 | ||
1678 | static int strip_receive_room(struct tty_struct *tty) | |
1679 | { | |
1680 | return 0x10000; /* We can handle an infinite amount of data. :-) */ | |
1681 | } | |
1682 | ||
1683 | /* | |
1684 | * This function parses the response to the ATS300? command, | |
1685 | * extracting the radio version and serial number. | |
1686 | */ | |
1687 | static void get_radio_version(struct strip *strip_info, __u8 * ptr, __u8 * end) | |
1688 | { | |
1689 | __u8 *p, *value_begin, *value_end; | |
1690 | int len; | |
1691 | ||
1692 | /* Determine the beginning of the second line of the payload */ | |
1693 | p = ptr; | |
1694 | while (p < end && *p != 10) | |
1695 | p++; | |
1696 | if (p >= end) | |
1697 | return; | |
1698 | p++; | |
1699 | value_begin = p; | |
1700 | ||
1701 | /* Determine the end of line */ | |
1702 | while (p < end && *p != 10) | |
1703 | p++; | |
1704 | if (p >= end) | |
1705 | return; | |
1706 | value_end = p; | |
1707 | p++; | |
1708 | ||
1709 | len = value_end - value_begin; | |
1710 | len = min_t(int, len, sizeof(FirmwareVersion) - 1); | |
1711 | if (strip_info->firmware_version.c[0] == 0) | |
1712 | printk(KERN_INFO "%s: Radio Firmware: %.*s\n", | |
1713 | strip_info->dev->name, len, value_begin); | |
1714 | sprintf(strip_info->firmware_version.c, "%.*s", len, value_begin); | |
1715 | ||
1716 | /* Look for the first colon */ | |
1717 | while (p < end && *p != ':') | |
1718 | p++; | |
1719 | if (p >= end) | |
1720 | return; | |
1721 | /* Skip over the space */ | |
1722 | p += 2; | |
1723 | len = sizeof(SerialNumber) - 1; | |
1724 | if (p + len <= end) { | |
1725 | sprintf(strip_info->serial_number.c, "%.*s", len, p); | |
1726 | } else { | |
1727 | printk(KERN_DEBUG | |
1728 | "STRIP: radio serial number shorter (%zd) than expected (%d)\n", | |
1729 | end - p, len); | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * This function parses the response to the ATS325? command, | |
1735 | * extracting the radio battery voltage. | |
1736 | */ | |
1737 | static void get_radio_voltage(struct strip *strip_info, __u8 * ptr, __u8 * end) | |
1738 | { | |
1739 | int len; | |
1740 | ||
1741 | len = sizeof(BatteryVoltage) - 1; | |
1742 | if (ptr + len <= end) { | |
1743 | sprintf(strip_info->battery_voltage.c, "%.*s", len, ptr); | |
1744 | } else { | |
1745 | printk(KERN_DEBUG | |
1746 | "STRIP: radio voltage string shorter (%zd) than expected (%d)\n", | |
1747 | end - ptr, len); | |
1748 | } | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * This function parses the responses to the AT~LA and ATS311 commands, | |
1753 | * which list the radio's neighbours. | |
1754 | */ | |
1755 | static void get_radio_neighbours(MetricomNodeTable * table, __u8 * ptr, __u8 * end) | |
1756 | { | |
1757 | table->num_nodes = 0; | |
1758 | while (ptr < end && table->num_nodes < NODE_TABLE_SIZE) { | |
1759 | MetricomNode *node = &table->node[table->num_nodes++]; | |
1760 | char *dst = node->c, *limit = dst + sizeof(*node) - 1; | |
1761 | while (ptr < end && *ptr <= 32) | |
1762 | ptr++; | |
1763 | while (ptr < end && dst < limit && *ptr != 10) | |
1764 | *dst++ = *ptr++; | |
1765 | *dst++ = 0; | |
1766 | while (ptr < end && ptr[-1] != 10) | |
1767 | ptr++; | |
1768 | } | |
1769 | do_gettimeofday(&table->timestamp); | |
1770 | } | |
1771 | ||
1772 | static int get_radio_address(struct strip *strip_info, __u8 * p) | |
1773 | { | |
1774 | MetricomAddress addr; | |
1775 | ||
1776 | if (string_to_radio_address(&addr, p)) | |
1777 | return (1); | |
1778 | ||
1779 | /* See if our radio address has changed */ | |
1780 | if (memcmp(strip_info->true_dev_addr.c, addr.c, sizeof(addr))) { | |
1781 | MetricomAddressString addr_string; | |
1782 | radio_address_to_string(&addr, &addr_string); | |
1783 | printk(KERN_INFO "%s: Radio address = %s\n", | |
1784 | strip_info->dev->name, addr_string.c); | |
1785 | strip_info->true_dev_addr = addr; | |
1786 | if (!strip_info->manual_dev_addr) | |
1787 | *(MetricomAddress *) strip_info->dev->dev_addr = | |
1788 | addr; | |
1789 | /* Give the radio a few seconds to get its head straight, then send an arp */ | |
1790 | strip_info->gratuitous_arp = jiffies + 15 * HZ; | |
1791 | strip_info->arp_interval = 1 * HZ; | |
1792 | } | |
1793 | return (0); | |
1794 | } | |
1795 | ||
1796 | static int verify_checksum(struct strip *strip_info) | |
1797 | { | |
1798 | __u8 *p = strip_info->sx_buff; | |
1799 | __u8 *end = strip_info->sx_buff + strip_info->sx_count - 4; | |
1800 | u_short sum = | |
1801 | (READHEX16(end[0]) << 12) | (READHEX16(end[1]) << 8) | | |
1802 | (READHEX16(end[2]) << 4) | (READHEX16(end[3])); | |
1803 | while (p < end) | |
1804 | sum -= *p++; | |
1805 | if (sum == 0 && strip_info->firmware_level == StructuredMessages) { | |
1806 | strip_info->firmware_level = ChecksummedMessages; | |
1807 | printk(KERN_INFO "%s: Radio provides message checksums\n", | |
1808 | strip_info->dev->name); | |
1809 | } | |
1810 | return (sum == 0); | |
1811 | } | |
1812 | ||
1813 | static void RecvErr(char *msg, struct strip *strip_info) | |
1814 | { | |
1815 | __u8 *ptr = strip_info->sx_buff; | |
1816 | __u8 *end = strip_info->sx_buff + strip_info->sx_count; | |
1817 | DumpData(msg, strip_info, ptr, end); | |
1818 | strip_info->rx_errors++; | |
1819 | } | |
1820 | ||
1821 | static void RecvErr_Message(struct strip *strip_info, __u8 * sendername, | |
1822 | const __u8 * msg, u_long len) | |
1823 | { | |
1824 | if (has_prefix(msg, len, "001")) { /* Not in StarMode! */ | |
1825 | RecvErr("Error Msg:", strip_info); | |
1826 | printk(KERN_INFO "%s: Radio %s is not in StarMode\n", | |
1827 | strip_info->dev->name, sendername); | |
1828 | } | |
1829 | ||
1830 | else if (has_prefix(msg, len, "002")) { /* Remap handle */ | |
1831 | /* We ignore "Remap handle" messages for now */ | |
1832 | } | |
1833 | ||
1834 | else if (has_prefix(msg, len, "003")) { /* Can't resolve name */ | |
1835 | RecvErr("Error Msg:", strip_info); | |
1836 | printk(KERN_INFO "%s: Destination radio name is unknown\n", | |
1837 | strip_info->dev->name); | |
1838 | } | |
1839 | ||
1840 | else if (has_prefix(msg, len, "004")) { /* Name too small or missing */ | |
1841 | strip_info->watchdog_doreset = jiffies + LongTime; | |
1842 | #if TICKLE_TIMERS | |
1843 | { | |
1844 | struct timeval tv; | |
1845 | do_gettimeofday(&tv); | |
1846 | printk(KERN_INFO | |
1847 | "**** Got ERR_004 response at %02d.%06d\n", | |
1848 | tv.tv_sec % 100, tv.tv_usec); | |
1849 | } | |
1850 | #endif | |
1851 | if (!strip_info->working) { | |
1852 | strip_info->working = TRUE; | |
1853 | printk(KERN_INFO "%s: Radio now in starmode\n", | |
1854 | strip_info->dev->name); | |
1855 | /* | |
1856 | * If the radio has just entered a working state, we should do our first | |
1857 | * probe ASAP, so that we find out our radio address etc. without delay. | |
1858 | */ | |
1859 | strip_info->watchdog_doprobe = jiffies; | |
1860 | } | |
1861 | if (strip_info->firmware_level == NoStructure && sendername) { | |
1862 | strip_info->firmware_level = StructuredMessages; | |
1863 | strip_info->next_command = 0; /* Try to enable checksums ASAP */ | |
1864 | printk(KERN_INFO | |
1865 | "%s: Radio provides structured messages\n", | |
1866 | strip_info->dev->name); | |
1867 | } | |
1868 | if (strip_info->firmware_level >= StructuredMessages) { | |
1869 | /* | |
1870 | * If this message has a valid checksum on the end, then the call to verify_checksum | |
1871 | * will elevate the firmware_level to ChecksummedMessages for us. (The actual return | |
1872 | * code from verify_checksum is ignored here.) | |
1873 | */ | |
1874 | verify_checksum(strip_info); | |
1875 | /* | |
1876 | * If the radio has structured messages but we don't yet have all our information about it, | |
1877 | * we should do probes without delay, until we have gathered all the information | |
1878 | */ | |
1879 | if (!GOT_ALL_RADIO_INFO(strip_info)) | |
1880 | strip_info->watchdog_doprobe = jiffies; | |
1881 | } | |
1882 | } | |
1883 | ||
1884 | else if (has_prefix(msg, len, "005")) /* Bad count specification */ | |
1885 | RecvErr("Error Msg:", strip_info); | |
1886 | ||
1887 | else if (has_prefix(msg, len, "006")) /* Header too big */ | |
1888 | RecvErr("Error Msg:", strip_info); | |
1889 | ||
1890 | else if (has_prefix(msg, len, "007")) { /* Body too big */ | |
1891 | RecvErr("Error Msg:", strip_info); | |
1892 | printk(KERN_ERR | |
1893 | "%s: Error! Packet size too big for radio.\n", | |
1894 | strip_info->dev->name); | |
1895 | } | |
1896 | ||
1897 | else if (has_prefix(msg, len, "008")) { /* Bad character in name */ | |
1898 | RecvErr("Error Msg:", strip_info); | |
1899 | printk(KERN_ERR | |
1900 | "%s: Radio name contains illegal character\n", | |
1901 | strip_info->dev->name); | |
1902 | } | |
1903 | ||
1904 | else if (has_prefix(msg, len, "009")) /* No count or line terminator */ | |
1905 | RecvErr("Error Msg:", strip_info); | |
1906 | ||
1907 | else if (has_prefix(msg, len, "010")) /* Invalid checksum */ | |
1908 | RecvErr("Error Msg:", strip_info); | |
1909 | ||
1910 | else if (has_prefix(msg, len, "011")) /* Checksum didn't match */ | |
1911 | RecvErr("Error Msg:", strip_info); | |
1912 | ||
1913 | else if (has_prefix(msg, len, "012")) /* Failed to transmit packet */ | |
1914 | RecvErr("Error Msg:", strip_info); | |
1915 | ||
1916 | else | |
1917 | RecvErr("Error Msg:", strip_info); | |
1918 | } | |
1919 | ||
1920 | static void process_AT_response(struct strip *strip_info, __u8 * ptr, | |
1921 | __u8 * end) | |
1922 | { | |
1923 | u_long len; | |
1924 | __u8 *p = ptr; | |
1925 | while (p < end && p[-1] != 10) | |
1926 | p++; /* Skip past first newline character */ | |
1927 | /* Now ptr points to the AT command, and p points to the text of the response. */ | |
1928 | len = p - ptr; | |
1929 | ||
1930 | #if TICKLE_TIMERS | |
1931 | { | |
1932 | struct timeval tv; | |
1933 | do_gettimeofday(&tv); | |
1934 | printk(KERN_INFO "**** Got AT response %.7s at %02d.%06d\n", | |
1935 | ptr, tv.tv_sec % 100, tv.tv_usec); | |
1936 | } | |
1937 | #endif | |
1938 | ||
1939 | if (has_prefix(ptr, len, "ATS300?")) | |
1940 | get_radio_version(strip_info, p, end); | |
1941 | else if (has_prefix(ptr, len, "ATS305?")) | |
1942 | get_radio_address(strip_info, p); | |
1943 | else if (has_prefix(ptr, len, "ATS311?")) | |
1944 | get_radio_neighbours(&strip_info->poletops, p, end); | |
1945 | else if (has_prefix(ptr, len, "ATS319=7")) | |
1946 | verify_checksum(strip_info); | |
1947 | else if (has_prefix(ptr, len, "ATS325?")) | |
1948 | get_radio_voltage(strip_info, p, end); | |
1949 | else if (has_prefix(ptr, len, "AT~LA")) | |
1950 | get_radio_neighbours(&strip_info->portables, p, end); | |
1951 | else | |
1952 | RecvErr("Unknown AT Response:", strip_info); | |
1953 | } | |
1954 | ||
1955 | static void process_ACK(struct strip *strip_info, __u8 * ptr, __u8 * end) | |
1956 | { | |
1957 | /* Currently we don't do anything with ACKs from the radio */ | |
1958 | } | |
1959 | ||
1960 | static void process_Info(struct strip *strip_info, __u8 * ptr, __u8 * end) | |
1961 | { | |
1962 | if (ptr + 16 > end) | |
1963 | RecvErr("Bad Info Msg:", strip_info); | |
1964 | } | |
1965 | ||
1966 | static struct net_device *get_strip_dev(struct strip *strip_info) | |
1967 | { | |
1968 | /* If our hardware address is *manually set* to zero, and we know our */ | |
1969 | /* real radio hardware address, try to find another strip device that has been */ | |
1970 | /* manually set to that address that we can 'transfer ownership' of this packet to */ | |
1971 | if (strip_info->manual_dev_addr && | |
1972 | !memcmp(strip_info->dev->dev_addr, zero_address.c, | |
1973 | sizeof(zero_address)) | |
1974 | && memcmp(&strip_info->true_dev_addr, zero_address.c, | |
1975 | sizeof(zero_address))) { | |
1976 | struct net_device *dev; | |
1977 | read_lock_bh(&dev_base_lock); | |
1978 | dev = dev_base; | |
1979 | while (dev) { | |
1980 | if (dev->type == strip_info->dev->type && | |
1981 | !memcmp(dev->dev_addr, | |
1982 | &strip_info->true_dev_addr, | |
1983 | sizeof(MetricomAddress))) { | |
1984 | printk(KERN_INFO | |
1985 | "%s: Transferred packet ownership to %s.\n", | |
1986 | strip_info->dev->name, dev->name); | |
1987 | read_unlock_bh(&dev_base_lock); | |
1988 | return (dev); | |
1989 | } | |
1990 | dev = dev->next; | |
1991 | } | |
1992 | read_unlock_bh(&dev_base_lock); | |
1993 | } | |
1994 | return (strip_info->dev); | |
1995 | } | |
1996 | ||
1997 | /* | |
1998 | * Send one completely decapsulated datagram to the next layer. | |
1999 | */ | |
2000 | ||
2001 | static void deliver_packet(struct strip *strip_info, STRIP_Header * header, | |
2002 | __u16 packetlen) | |
2003 | { | |
2004 | struct sk_buff *skb = dev_alloc_skb(sizeof(STRIP_Header) + packetlen); | |
2005 | if (!skb) { | |
2006 | printk(KERN_ERR "%s: memory squeeze, dropping packet.\n", | |
2007 | strip_info->dev->name); | |
2008 | strip_info->rx_dropped++; | |
2009 | } else { | |
2010 | memcpy(skb_put(skb, sizeof(STRIP_Header)), header, | |
2011 | sizeof(STRIP_Header)); | |
2012 | memcpy(skb_put(skb, packetlen), strip_info->rx_buff, | |
2013 | packetlen); | |
2014 | skb->dev = get_strip_dev(strip_info); | |
2015 | skb->protocol = header->protocol; | |
2016 | skb->mac.raw = skb->data; | |
2017 | ||
2018 | /* Having put a fake header on the front of the sk_buff for the */ | |
2019 | /* benefit of tools like tcpdump, skb_pull now 'consumes' that */ | |
2020 | /* fake header before we hand the packet up to the next layer. */ | |
2021 | skb_pull(skb, sizeof(STRIP_Header)); | |
2022 | ||
2023 | /* Finally, hand the packet up to the next layer (e.g. IP or ARP, etc.) */ | |
2024 | strip_info->rx_packets++; | |
2025 | strip_info->rx_pps_count++; | |
2026 | #ifdef EXT_COUNTERS | |
2027 | strip_info->rx_bytes += packetlen; | |
2028 | #endif | |
2029 | skb->dev->last_rx = jiffies; | |
2030 | netif_rx(skb); | |
2031 | } | |
2032 | } | |
2033 | ||
2034 | static void process_IP_packet(struct strip *strip_info, | |
2035 | STRIP_Header * header, __u8 * ptr, | |
2036 | __u8 * end) | |
2037 | { | |
2038 | __u16 packetlen; | |
2039 | ||
2040 | /* Decode start of the IP packet header */ | |
2041 | ptr = UnStuffData(ptr, end, strip_info->rx_buff, 4); | |
2042 | if (!ptr) { | |
2043 | RecvErr("IP Packet too short", strip_info); | |
2044 | return; | |
2045 | } | |
2046 | ||
2047 | packetlen = ((__u16) strip_info->rx_buff[2] << 8) | strip_info->rx_buff[3]; | |
2048 | ||
2049 | if (packetlen > MAX_RECV_MTU) { | |
2050 | printk(KERN_INFO "%s: Dropping oversized received IP packet: %d bytes\n", | |
2051 | strip_info->dev->name, packetlen); | |
2052 | strip_info->rx_dropped++; | |
2053 | return; | |
2054 | } | |
2055 | ||
2056 | /*printk(KERN_INFO "%s: Got %d byte IP packet\n", strip_info->dev->name, packetlen); */ | |
2057 | ||
2058 | /* Decode remainder of the IP packet */ | |
2059 | ptr = | |
2060 | UnStuffData(ptr, end, strip_info->rx_buff + 4, packetlen - 4); | |
2061 | if (!ptr) { | |
2062 | RecvErr("IP Packet too short", strip_info); | |
2063 | return; | |
2064 | } | |
2065 | ||
2066 | if (ptr < end) { | |
2067 | RecvErr("IP Packet too long", strip_info); | |
2068 | return; | |
2069 | } | |
2070 | ||
2071 | header->protocol = htons(ETH_P_IP); | |
2072 | ||
2073 | deliver_packet(strip_info, header, packetlen); | |
2074 | } | |
2075 | ||
2076 | static void process_ARP_packet(struct strip *strip_info, | |
2077 | STRIP_Header * header, __u8 * ptr, | |
2078 | __u8 * end) | |
2079 | { | |
2080 | __u16 packetlen; | |
2081 | struct arphdr *arphdr = (struct arphdr *) strip_info->rx_buff; | |
2082 | ||
2083 | /* Decode start of the ARP packet */ | |
2084 | ptr = UnStuffData(ptr, end, strip_info->rx_buff, 8); | |
2085 | if (!ptr) { | |
2086 | RecvErr("ARP Packet too short", strip_info); | |
2087 | return; | |
2088 | } | |
2089 | ||
2090 | packetlen = 8 + (arphdr->ar_hln + arphdr->ar_pln) * 2; | |
2091 | ||
2092 | if (packetlen > MAX_RECV_MTU) { | |
2093 | printk(KERN_INFO | |
2094 | "%s: Dropping oversized received ARP packet: %d bytes\n", | |
2095 | strip_info->dev->name, packetlen); | |
2096 | strip_info->rx_dropped++; | |
2097 | return; | |
2098 | } | |
2099 | ||
2100 | /*printk(KERN_INFO "%s: Got %d byte ARP %s\n", | |
2101 | strip_info->dev->name, packetlen, | |
2102 | ntohs(arphdr->ar_op) == ARPOP_REQUEST ? "request" : "reply"); */ | |
2103 | ||
2104 | /* Decode remainder of the ARP packet */ | |
2105 | ptr = | |
2106 | UnStuffData(ptr, end, strip_info->rx_buff + 8, packetlen - 8); | |
2107 | if (!ptr) { | |
2108 | RecvErr("ARP Packet too short", strip_info); | |
2109 | return; | |
2110 | } | |
2111 | ||
2112 | if (ptr < end) { | |
2113 | RecvErr("ARP Packet too long", strip_info); | |
2114 | return; | |
2115 | } | |
2116 | ||
2117 | header->protocol = htons(ETH_P_ARP); | |
2118 | ||
2119 | deliver_packet(strip_info, header, packetlen); | |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * process_text_message processes a <CR>-terminated block of data received | |
2124 | * from the radio that doesn't begin with a '*' character. All normal | |
2125 | * Starmode communication messages with the radio begin with a '*', | |
2126 | * so any text that does not indicates a serial port error, a radio that | |
2127 | * is in Hayes command mode instead of Starmode, or a radio with really | |
2128 | * old firmware that doesn't frame its Starmode responses properly. | |
2129 | */ | |
2130 | static void process_text_message(struct strip *strip_info) | |
2131 | { | |
2132 | __u8 *msg = strip_info->sx_buff; | |
2133 | int len = strip_info->sx_count; | |
2134 | ||
2135 | /* Check for anything that looks like it might be our radio name */ | |
2136 | /* (This is here for backwards compatibility with old firmware) */ | |
2137 | if (len == 9 && get_radio_address(strip_info, msg) == 0) | |
2138 | return; | |
2139 | ||
2140 | if (text_equal(msg, len, "OK")) | |
2141 | return; /* Ignore 'OK' responses from prior commands */ | |
2142 | if (text_equal(msg, len, "ERROR")) | |
2143 | return; /* Ignore 'ERROR' messages */ | |
2144 | if (has_prefix(msg, len, "ate0q1")) | |
2145 | return; /* Ignore character echo back from the radio */ | |
2146 | ||
2147 | /* Catch other error messages */ | |
2148 | /* (This is here for backwards compatibility with old firmware) */ | |
2149 | if (has_prefix(msg, len, "ERR_")) { | |
2150 | RecvErr_Message(strip_info, NULL, &msg[4], len - 4); | |
2151 | return; | |
2152 | } | |
2153 | ||
2154 | RecvErr("No initial *", strip_info); | |
2155 | } | |
2156 | ||
2157 | /* | |
2158 | * process_message processes a <CR>-terminated block of data received | |
2159 | * from the radio. If the radio is not in Starmode or has old firmware, | |
2160 | * it may be a line of text in response to an AT command. Ideally, with | |
2161 | * a current radio that's properly in Starmode, all data received should | |
2162 | * be properly framed and checksummed radio message blocks, containing | |
2163 | * either a starmode packet, or a other communication from the radio | |
2164 | * firmware, like "INF_" Info messages and &COMMAND responses. | |
2165 | */ | |
2166 | static void process_message(struct strip *strip_info) | |
2167 | { | |
2168 | STRIP_Header header = { zero_address, zero_address, 0 }; | |
2169 | __u8 *ptr = strip_info->sx_buff; | |
2170 | __u8 *end = strip_info->sx_buff + strip_info->sx_count; | |
2171 | __u8 sendername[32], *sptr = sendername; | |
2172 | MetricomKey key; | |
2173 | ||
2174 | /*HexDump("Receiving", strip_info, ptr, end); */ | |
2175 | ||
2176 | /* Check for start of address marker, and then skip over it */ | |
2177 | if (*ptr == '*') | |
2178 | ptr++; | |
2179 | else { | |
2180 | process_text_message(strip_info); | |
2181 | return; | |
2182 | } | |
2183 | ||
2184 | /* Copy out the return address */ | |
2185 | while (ptr < end && *ptr != '*' | |
2186 | && sptr < ARRAY_END(sendername) - 1) | |
2187 | *sptr++ = *ptr++; | |
2188 | *sptr = 0; /* Null terminate the sender name */ | |
2189 | ||
2190 | /* Check for end of address marker, and skip over it */ | |
2191 | if (ptr >= end || *ptr != '*') { | |
2192 | RecvErr("No second *", strip_info); | |
2193 | return; | |
2194 | } | |
2195 | ptr++; /* Skip the second '*' */ | |
2196 | ||
2197 | /* If the sender name is "&COMMAND", ignore this 'packet' */ | |
2198 | /* (This is here for backwards compatibility with old firmware) */ | |
2199 | if (!strcmp(sendername, "&COMMAND")) { | |
2200 | strip_info->firmware_level = NoStructure; | |
2201 | strip_info->next_command = CompatibilityCommand; | |
2202 | return; | |
2203 | } | |
2204 | ||
2205 | if (ptr + 4 > end) { | |
2206 | RecvErr("No proto key", strip_info); | |
2207 | return; | |
2208 | } | |
2209 | ||
2210 | /* Get the protocol key out of the buffer */ | |
2211 | key.c[0] = *ptr++; | |
2212 | key.c[1] = *ptr++; | |
2213 | key.c[2] = *ptr++; | |
2214 | key.c[3] = *ptr++; | |
2215 | ||
2216 | /* If we're using checksums, verify the checksum at the end of the packet */ | |
2217 | if (strip_info->firmware_level >= ChecksummedMessages) { | |
2218 | end -= 4; /* Chop the last four bytes off the packet (they're the checksum) */ | |
2219 | if (ptr > end) { | |
2220 | RecvErr("Missing Checksum", strip_info); | |
2221 | return; | |
2222 | } | |
2223 | if (!verify_checksum(strip_info)) { | |
2224 | RecvErr("Bad Checksum", strip_info); | |
2225 | return; | |
2226 | } | |
2227 | } | |
2228 | ||
2229 | /*printk(KERN_INFO "%s: Got packet from \"%s\".\n", strip_info->dev->name, sendername); */ | |
2230 | ||
2231 | /* | |
2232 | * Fill in (pseudo) source and destination addresses in the packet. | |
2233 | * We assume that the destination address was our address (the radio does not | |
2234 | * tell us this). If the radio supplies a source address, then we use it. | |
2235 | */ | |
2236 | header.dst_addr = strip_info->true_dev_addr; | |
2237 | string_to_radio_address(&header.src_addr, sendername); | |
2238 | ||
2239 | #ifdef EXT_COUNTERS | |
2240 | if (key.l == SIP0Key.l) { | |
2241 | strip_info->rx_rbytes += (end - ptr); | |
2242 | process_IP_packet(strip_info, &header, ptr, end); | |
2243 | } else if (key.l == ARP0Key.l) { | |
2244 | strip_info->rx_rbytes += (end - ptr); | |
2245 | process_ARP_packet(strip_info, &header, ptr, end); | |
2246 | } else if (key.l == ATR_Key.l) { | |
2247 | strip_info->rx_ebytes += (end - ptr); | |
2248 | process_AT_response(strip_info, ptr, end); | |
2249 | } else if (key.l == ACK_Key.l) { | |
2250 | strip_info->rx_ebytes += (end - ptr); | |
2251 | process_ACK(strip_info, ptr, end); | |
2252 | } else if (key.l == INF_Key.l) { | |
2253 | strip_info->rx_ebytes += (end - ptr); | |
2254 | process_Info(strip_info, ptr, end); | |
2255 | } else if (key.l == ERR_Key.l) { | |
2256 | strip_info->rx_ebytes += (end - ptr); | |
2257 | RecvErr_Message(strip_info, sendername, ptr, end - ptr); | |
2258 | } else | |
2259 | RecvErr("Unrecognized protocol key", strip_info); | |
2260 | #else | |
2261 | if (key.l == SIP0Key.l) | |
2262 | process_IP_packet(strip_info, &header, ptr, end); | |
2263 | else if (key.l == ARP0Key.l) | |
2264 | process_ARP_packet(strip_info, &header, ptr, end); | |
2265 | else if (key.l == ATR_Key.l) | |
2266 | process_AT_response(strip_info, ptr, end); | |
2267 | else if (key.l == ACK_Key.l) | |
2268 | process_ACK(strip_info, ptr, end); | |
2269 | else if (key.l == INF_Key.l) | |
2270 | process_Info(strip_info, ptr, end); | |
2271 | else if (key.l == ERR_Key.l) | |
2272 | RecvErr_Message(strip_info, sendername, ptr, end - ptr); | |
2273 | else | |
2274 | RecvErr("Unrecognized protocol key", strip_info); | |
2275 | #endif | |
2276 | } | |
2277 | ||
2278 | #define TTYERROR(X) ((X) == TTY_BREAK ? "Break" : \ | |
2279 | (X) == TTY_FRAME ? "Framing Error" : \ | |
2280 | (X) == TTY_PARITY ? "Parity Error" : \ | |
2281 | (X) == TTY_OVERRUN ? "Hardware Overrun" : "Unknown Error") | |
2282 | ||
2283 | /* | |
2284 | * Handle the 'receiver data ready' interrupt. | |
2285 | * This function is called by the 'tty_io' module in the kernel when | |
2286 | * a block of STRIP data has been received, which can now be decapsulated | |
2287 | * and sent on to some IP layer for further processing. | |
2288 | */ | |
2289 | ||
2290 | static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp, | |
2291 | char *fp, int count) | |
2292 | { | |
2293 | struct strip *strip_info = (struct strip *) tty->disc_data; | |
2294 | const unsigned char *end = cp + count; | |
2295 | ||
2296 | if (!strip_info || strip_info->magic != STRIP_MAGIC | |
2297 | || !netif_running(strip_info->dev)) | |
2298 | return; | |
2299 | ||
2300 | spin_lock_bh(&strip_lock); | |
2301 | #if 0 | |
2302 | { | |
2303 | struct timeval tv; | |
2304 | do_gettimeofday(&tv); | |
2305 | printk(KERN_INFO | |
2306 | "**** strip_receive_buf: %3d bytes at %02d.%06d\n", | |
2307 | count, tv.tv_sec % 100, tv.tv_usec); | |
2308 | } | |
2309 | #endif | |
2310 | ||
2311 | #ifdef EXT_COUNTERS | |
2312 | strip_info->rx_sbytes += count; | |
2313 | #endif | |
2314 | ||
2315 | /* Read the characters out of the buffer */ | |
2316 | while (cp < end) { | |
2317 | if (fp && *fp) | |
2318 | printk(KERN_INFO "%s: %s on serial port\n", | |
2319 | strip_info->dev->name, TTYERROR(*fp)); | |
2320 | if (fp && *fp++ && !strip_info->discard) { /* If there's a serial error, record it */ | |
2321 | /* If we have some characters in the buffer, discard them */ | |
2322 | strip_info->discard = strip_info->sx_count; | |
2323 | strip_info->rx_errors++; | |
2324 | } | |
2325 | ||
2326 | /* Leading control characters (CR, NL, Tab, etc.) are ignored */ | |
2327 | if (strip_info->sx_count > 0 || *cp >= ' ') { | |
2328 | if (*cp == 0x0D) { /* If end of packet, decide what to do with it */ | |
2329 | if (strip_info->sx_count > 3000) | |
2330 | printk(KERN_INFO | |
2331 | "%s: Cut a %d byte packet (%zd bytes remaining)%s\n", | |
2332 | strip_info->dev->name, | |
2333 | strip_info->sx_count, | |
2334 | end - cp - 1, | |
2335 | strip_info-> | |
2336 | discard ? " (discarded)" : | |
2337 | ""); | |
2338 | if (strip_info->sx_count > | |
2339 | strip_info->sx_size) { | |
2340 | strip_info->rx_over_errors++; | |
2341 | printk(KERN_INFO | |
2342 | "%s: sx_buff overflow (%d bytes total)\n", | |
2343 | strip_info->dev->name, | |
2344 | strip_info->sx_count); | |
2345 | } else if (strip_info->discard) | |
2346 | printk(KERN_INFO | |
2347 | "%s: Discarding bad packet (%d/%d)\n", | |
2348 | strip_info->dev->name, | |
2349 | strip_info->discard, | |
2350 | strip_info->sx_count); | |
2351 | else | |
2352 | process_message(strip_info); | |
2353 | strip_info->discard = 0; | |
2354 | strip_info->sx_count = 0; | |
2355 | } else { | |
2356 | /* Make sure we have space in the buffer */ | |
2357 | if (strip_info->sx_count < | |
2358 | strip_info->sx_size) | |
2359 | strip_info->sx_buff[strip_info-> | |
2360 | sx_count] = | |
2361 | *cp; | |
2362 | strip_info->sx_count++; | |
2363 | } | |
2364 | } | |
2365 | cp++; | |
2366 | } | |
2367 | spin_unlock_bh(&strip_lock); | |
2368 | } | |
2369 | ||
2370 | ||
2371 | /************************************************************************/ | |
2372 | /* General control routines */ | |
2373 | ||
2374 | static int set_mac_address(struct strip *strip_info, | |
2375 | MetricomAddress * addr) | |
2376 | { | |
2377 | /* | |
2378 | * We're using a manually specified address if the address is set | |
2379 | * to anything other than all ones. Setting the address to all ones | |
2380 | * disables manual mode and goes back to automatic address determination | |
2381 | * (tracking the true address that the radio has). | |
2382 | */ | |
2383 | strip_info->manual_dev_addr = | |
2384 | memcmp(addr->c, broadcast_address.c, | |
2385 | sizeof(broadcast_address)); | |
2386 | if (strip_info->manual_dev_addr) | |
2387 | *(MetricomAddress *) strip_info->dev->dev_addr = *addr; | |
2388 | else | |
2389 | *(MetricomAddress *) strip_info->dev->dev_addr = | |
2390 | strip_info->true_dev_addr; | |
2391 | return 0; | |
2392 | } | |
2393 | ||
2394 | static int strip_set_mac_address(struct net_device *dev, void *addr) | |
2395 | { | |
2396 | struct strip *strip_info = netdev_priv(dev); | |
2397 | struct sockaddr *sa = addr; | |
2398 | printk(KERN_INFO "%s: strip_set_dev_mac_address called\n", dev->name); | |
2399 | set_mac_address(strip_info, (MetricomAddress *) sa->sa_data); | |
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | static struct net_device_stats *strip_get_stats(struct net_device *dev) | |
2404 | { | |
2405 | struct strip *strip_info = netdev_priv(dev); | |
2406 | static struct net_device_stats stats; | |
2407 | ||
2408 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
2409 | ||
2410 | stats.rx_packets = strip_info->rx_packets; | |
2411 | stats.tx_packets = strip_info->tx_packets; | |
2412 | stats.rx_dropped = strip_info->rx_dropped; | |
2413 | stats.tx_dropped = strip_info->tx_dropped; | |
2414 | stats.tx_errors = strip_info->tx_errors; | |
2415 | stats.rx_errors = strip_info->rx_errors; | |
2416 | stats.rx_over_errors = strip_info->rx_over_errors; | |
2417 | return (&stats); | |
2418 | } | |
2419 | ||
2420 | ||
2421 | /************************************************************************/ | |
2422 | /* Opening and closing */ | |
2423 | ||
2424 | /* | |
2425 | * Here's the order things happen: | |
2426 | * When the user runs "slattach -p strip ..." | |
2427 | * 1. The TTY module calls strip_open | |
2428 | * 2. strip_open calls strip_alloc | |
2429 | * 3. strip_alloc calls register_netdev | |
2430 | * 4. register_netdev calls strip_dev_init | |
2431 | * 5. then strip_open finishes setting up the strip_info | |
2432 | * | |
2433 | * When the user runs "ifconfig st<x> up address netmask ..." | |
2434 | * 6. strip_open_low gets called | |
2435 | * | |
2436 | * When the user runs "ifconfig st<x> down" | |
2437 | * 7. strip_close_low gets called | |
2438 | * | |
2439 | * When the user kills the slattach process | |
2440 | * 8. strip_close gets called | |
2441 | * 9. strip_close calls dev_close | |
2442 | * 10. if the device is still up, then dev_close calls strip_close_low | |
2443 | * 11. strip_close calls strip_free | |
2444 | */ | |
2445 | ||
2446 | /* Open the low-level part of the STRIP channel. Easy! */ | |
2447 | ||
2448 | static int strip_open_low(struct net_device *dev) | |
2449 | { | |
2450 | struct strip *strip_info = netdev_priv(dev); | |
2451 | ||
2452 | if (strip_info->tty == NULL) | |
2453 | return (-ENODEV); | |
2454 | ||
2455 | if (!allocate_buffers(strip_info, dev->mtu)) | |
2456 | return (-ENOMEM); | |
2457 | ||
2458 | strip_info->sx_count = 0; | |
2459 | strip_info->tx_left = 0; | |
2460 | ||
2461 | strip_info->discard = 0; | |
2462 | strip_info->working = FALSE; | |
2463 | strip_info->firmware_level = NoStructure; | |
2464 | strip_info->next_command = CompatibilityCommand; | |
2465 | strip_info->user_baud = get_baud(strip_info->tty); | |
2466 | ||
2467 | printk(KERN_INFO "%s: Initializing Radio.\n", | |
2468 | strip_info->dev->name); | |
2469 | ResetRadio(strip_info); | |
2470 | strip_info->idle_timer.expires = jiffies + 1 * HZ; | |
2471 | add_timer(&strip_info->idle_timer); | |
2472 | netif_wake_queue(dev); | |
2473 | return (0); | |
2474 | } | |
2475 | ||
2476 | ||
2477 | /* | |
2478 | * Close the low-level part of the STRIP channel. Easy! | |
2479 | */ | |
2480 | ||
2481 | static int strip_close_low(struct net_device *dev) | |
2482 | { | |
2483 | struct strip *strip_info = netdev_priv(dev); | |
2484 | ||
2485 | if (strip_info->tty == NULL) | |
2486 | return -EBUSY; | |
2487 | strip_info->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
2488 | ||
2489 | netif_stop_queue(dev); | |
2490 | ||
2491 | /* | |
2492 | * Free all STRIP frame buffers. | |
2493 | */ | |
b4558ea9 JJ |
2494 | kfree(strip_info->rx_buff); |
2495 | strip_info->rx_buff = NULL; | |
2496 | kfree(strip_info->sx_buff); | |
2497 | strip_info->sx_buff = NULL; | |
2498 | kfree(strip_info->tx_buff); | |
2499 | strip_info->tx_buff = NULL; | |
2500 | ||
1da177e4 LT |
2501 | del_timer(&strip_info->idle_timer); |
2502 | return 0; | |
2503 | } | |
2504 | ||
2505 | /* | |
2506 | * This routine is called by DDI when the | |
2507 | * (dynamically assigned) device is registered | |
2508 | */ | |
2509 | ||
2510 | static void strip_dev_setup(struct net_device *dev) | |
2511 | { | |
2512 | /* | |
2513 | * Finish setting up the DEVICE info. | |
2514 | */ | |
2515 | ||
2516 | SET_MODULE_OWNER(dev); | |
2517 | ||
2518 | dev->trans_start = 0; | |
2519 | dev->last_rx = 0; | |
2520 | dev->tx_queue_len = 30; /* Drop after 30 frames queued */ | |
2521 | ||
2522 | dev->flags = 0; | |
2523 | dev->mtu = DEFAULT_STRIP_MTU; | |
2524 | dev->type = ARPHRD_METRICOM; /* dtang */ | |
2525 | dev->hard_header_len = sizeof(STRIP_Header); | |
2526 | /* | |
2527 | * dev->priv Already holds a pointer to our struct strip | |
2528 | */ | |
2529 | ||
2530 | *(MetricomAddress *) & dev->broadcast = broadcast_address; | |
2531 | dev->dev_addr[0] = 0; | |
2532 | dev->addr_len = sizeof(MetricomAddress); | |
2533 | ||
2534 | /* | |
2535 | * Pointers to interface service routines. | |
2536 | */ | |
2537 | ||
2538 | dev->open = strip_open_low; | |
2539 | dev->stop = strip_close_low; | |
2540 | dev->hard_start_xmit = strip_xmit; | |
2541 | dev->hard_header = strip_header; | |
2542 | dev->rebuild_header = strip_rebuild_header; | |
2543 | dev->set_mac_address = strip_set_mac_address; | |
2544 | dev->get_stats = strip_get_stats; | |
2545 | dev->change_mtu = strip_change_mtu; | |
2546 | } | |
2547 | ||
2548 | /* | |
2549 | * Free a STRIP channel. | |
2550 | */ | |
2551 | ||
2552 | static void strip_free(struct strip *strip_info) | |
2553 | { | |
2554 | spin_lock_bh(&strip_lock); | |
2555 | list_del_rcu(&strip_info->list); | |
2556 | spin_unlock_bh(&strip_lock); | |
2557 | ||
2558 | strip_info->magic = 0; | |
2559 | ||
2560 | free_netdev(strip_info->dev); | |
2561 | } | |
2562 | ||
2563 | ||
2564 | /* | |
2565 | * Allocate a new free STRIP channel | |
2566 | */ | |
2567 | static struct strip *strip_alloc(void) | |
2568 | { | |
2569 | struct list_head *n; | |
2570 | struct net_device *dev; | |
2571 | struct strip *strip_info; | |
2572 | ||
2573 | dev = alloc_netdev(sizeof(struct strip), "st%d", | |
2574 | strip_dev_setup); | |
2575 | ||
2576 | if (!dev) | |
2577 | return NULL; /* If no more memory, return */ | |
2578 | ||
2579 | ||
2580 | strip_info = dev->priv; | |
2581 | strip_info->dev = dev; | |
2582 | ||
2583 | strip_info->magic = STRIP_MAGIC; | |
2584 | strip_info->tty = NULL; | |
2585 | ||
2586 | strip_info->gratuitous_arp = jiffies + LongTime; | |
2587 | strip_info->arp_interval = 0; | |
2588 | init_timer(&strip_info->idle_timer); | |
2589 | strip_info->idle_timer.data = (long) dev; | |
2590 | strip_info->idle_timer.function = strip_IdleTask; | |
2591 | ||
2592 | ||
2593 | spin_lock_bh(&strip_lock); | |
2594 | rescan: | |
2595 | /* | |
2596 | * Search the list to find where to put our new entry | |
2597 | * (and in the process decide what channel number it is | |
2598 | * going to be) | |
2599 | */ | |
2600 | list_for_each(n, &strip_list) { | |
2601 | struct strip *s = hlist_entry(n, struct strip, list); | |
2602 | ||
2603 | if (s->dev->base_addr == dev->base_addr) { | |
2604 | ++dev->base_addr; | |
2605 | goto rescan; | |
2606 | } | |
2607 | } | |
2608 | ||
2609 | sprintf(dev->name, "st%ld", dev->base_addr); | |
2610 | ||
2611 | list_add_tail_rcu(&strip_info->list, &strip_list); | |
2612 | spin_unlock_bh(&strip_lock); | |
2613 | ||
2614 | return strip_info; | |
2615 | } | |
2616 | ||
2617 | /* | |
2618 | * Open the high-level part of the STRIP channel. | |
2619 | * This function is called by the TTY module when the | |
2620 | * STRIP line discipline is called for. Because we are | |
2621 | * sure the tty line exists, we only have to link it to | |
2622 | * a free STRIP channel... | |
2623 | */ | |
2624 | ||
2625 | static int strip_open(struct tty_struct *tty) | |
2626 | { | |
2627 | struct strip *strip_info = (struct strip *) tty->disc_data; | |
2628 | ||
2629 | /* | |
2630 | * First make sure we're not already connected. | |
2631 | */ | |
2632 | ||
2633 | if (strip_info && strip_info->magic == STRIP_MAGIC) | |
2634 | return -EEXIST; | |
2635 | ||
2636 | /* | |
2637 | * OK. Find a free STRIP channel to use. | |
2638 | */ | |
2639 | if ((strip_info = strip_alloc()) == NULL) | |
2640 | return -ENFILE; | |
2641 | ||
2642 | /* | |
2643 | * Register our newly created device so it can be ifconfig'd | |
2644 | * strip_dev_init() will be called as a side-effect | |
2645 | */ | |
2646 | ||
2647 | if (register_netdev(strip_info->dev) != 0) { | |
2648 | printk(KERN_ERR "strip: register_netdev() failed.\n"); | |
2649 | strip_free(strip_info); | |
2650 | return -ENFILE; | |
2651 | } | |
2652 | ||
2653 | strip_info->tty = tty; | |
2654 | tty->disc_data = strip_info; | |
2655 | if (tty->driver->flush_buffer) | |
2656 | tty->driver->flush_buffer(tty); | |
2657 | ||
2658 | /* | |
2659 | * Restore default settings | |
2660 | */ | |
2661 | ||
2662 | strip_info->dev->type = ARPHRD_METRICOM; /* dtang */ | |
2663 | ||
2664 | /* | |
2665 | * Set tty options | |
2666 | */ | |
2667 | ||
2668 | tty->termios->c_iflag |= IGNBRK | IGNPAR; /* Ignore breaks and parity errors. */ | |
2669 | tty->termios->c_cflag |= CLOCAL; /* Ignore modem control signals. */ | |
2670 | tty->termios->c_cflag &= ~HUPCL; /* Don't close on hup */ | |
2671 | ||
2672 | printk(KERN_INFO "STRIP: device \"%s\" activated\n", | |
2673 | strip_info->dev->name); | |
2674 | ||
2675 | /* | |
2676 | * Done. We have linked the TTY line to a channel. | |
2677 | */ | |
2678 | return (strip_info->dev->base_addr); | |
2679 | } | |
2680 | ||
2681 | /* | |
2682 | * Close down a STRIP channel. | |
2683 | * This means flushing out any pending queues, and then restoring the | |
2684 | * TTY line discipline to what it was before it got hooked to STRIP | |
2685 | * (which usually is TTY again). | |
2686 | */ | |
2687 | ||
2688 | static void strip_close(struct tty_struct *tty) | |
2689 | { | |
2690 | struct strip *strip_info = (struct strip *) tty->disc_data; | |
2691 | ||
2692 | /* | |
2693 | * First make sure we're connected. | |
2694 | */ | |
2695 | ||
2696 | if (!strip_info || strip_info->magic != STRIP_MAGIC) | |
2697 | return; | |
2698 | ||
2699 | unregister_netdev(strip_info->dev); | |
2700 | ||
2701 | tty->disc_data = NULL; | |
2702 | strip_info->tty = NULL; | |
2703 | printk(KERN_INFO "STRIP: device \"%s\" closed down\n", | |
2704 | strip_info->dev->name); | |
2705 | strip_free(strip_info); | |
2706 | tty->disc_data = NULL; | |
2707 | } | |
2708 | ||
2709 | ||
2710 | /************************************************************************/ | |
2711 | /* Perform I/O control calls on an active STRIP channel. */ | |
2712 | ||
2713 | static int strip_ioctl(struct tty_struct *tty, struct file *file, | |
2714 | unsigned int cmd, unsigned long arg) | |
2715 | { | |
2716 | struct strip *strip_info = (struct strip *) tty->disc_data; | |
2717 | ||
2718 | /* | |
2719 | * First make sure we're connected. | |
2720 | */ | |
2721 | ||
2722 | if (!strip_info || strip_info->magic != STRIP_MAGIC) | |
2723 | return -EINVAL; | |
2724 | ||
2725 | switch (cmd) { | |
2726 | case SIOCGIFNAME: | |
2727 | if(copy_to_user((void __user *) arg, strip_info->dev->name, strlen(strip_info->dev->name) + 1)) | |
2728 | return -EFAULT; | |
2729 | break; | |
2730 | case SIOCSIFHWADDR: | |
2731 | { | |
2732 | MetricomAddress addr; | |
2733 | //printk(KERN_INFO "%s: SIOCSIFHWADDR\n", strip_info->dev->name); | |
2734 | if(copy_from_user(&addr, (void __user *) arg, sizeof(MetricomAddress))) | |
2735 | return -EFAULT; | |
2736 | return set_mac_address(strip_info, &addr); | |
2737 | } | |
2738 | /* | |
2739 | * Allow stty to read, but not set, the serial port | |
2740 | */ | |
2741 | ||
2742 | case TCGETS: | |
2743 | case TCGETA: | |
2744 | return n_tty_ioctl(tty, file, cmd, arg); | |
2745 | break; | |
2746 | default: | |
2747 | return -ENOIOCTLCMD; | |
2748 | break; | |
2749 | } | |
2750 | return 0; | |
2751 | } | |
2752 | ||
2753 | ||
2754 | /************************************************************************/ | |
2755 | /* Initialization */ | |
2756 | ||
2757 | static struct tty_ldisc strip_ldisc = { | |
2758 | .magic = TTY_LDISC_MAGIC, | |
2759 | .name = "strip", | |
2760 | .owner = THIS_MODULE, | |
2761 | .open = strip_open, | |
2762 | .close = strip_close, | |
2763 | .ioctl = strip_ioctl, | |
2764 | .receive_buf = strip_receive_buf, | |
2765 | .receive_room = strip_receive_room, | |
2766 | .write_wakeup = strip_write_some_more, | |
2767 | }; | |
2768 | ||
2769 | /* | |
2770 | * Initialize the STRIP driver. | |
2771 | * This routine is called at boot time, to bootstrap the multi-channel | |
2772 | * STRIP driver | |
2773 | */ | |
2774 | ||
2775 | static char signon[] __initdata = | |
2776 | KERN_INFO "STRIP: Version %s (unlimited channels)\n"; | |
2777 | ||
2778 | static int __init strip_init_driver(void) | |
2779 | { | |
2780 | int status; | |
2781 | ||
2782 | printk(signon, StripVersion); | |
2783 | ||
2784 | ||
2785 | /* | |
2786 | * Fill in our line protocol discipline, and register it | |
2787 | */ | |
2788 | if ((status = tty_register_ldisc(N_STRIP, &strip_ldisc))) | |
2789 | printk(KERN_ERR "STRIP: can't register line discipline (err = %d)\n", | |
2790 | status); | |
2791 | ||
2792 | /* | |
2793 | * Register the status file with /proc | |
2794 | */ | |
2795 | proc_net_fops_create("strip", S_IFREG | S_IRUGO, &strip_seq_fops); | |
2796 | ||
2797 | return status; | |
2798 | } | |
2799 | ||
2800 | module_init(strip_init_driver); | |
2801 | ||
2802 | static const char signoff[] __exitdata = | |
2803 | KERN_INFO "STRIP: Module Unloaded\n"; | |
2804 | ||
2805 | static void __exit strip_exit_driver(void) | |
2806 | { | |
2807 | int i; | |
2808 | struct list_head *p,*n; | |
2809 | ||
2810 | /* module ref count rules assure that all entries are unregistered */ | |
2811 | list_for_each_safe(p, n, &strip_list) { | |
2812 | struct strip *s = list_entry(p, struct strip, list); | |
2813 | strip_free(s); | |
2814 | } | |
2815 | ||
2816 | /* Unregister with the /proc/net file here. */ | |
2817 | proc_net_remove("strip"); | |
2818 | ||
64ccd715 | 2819 | if ((i = tty_unregister_ldisc(N_STRIP))) |
1da177e4 LT |
2820 | printk(KERN_ERR "STRIP: can't unregister line discipline (err = %d)\n", i); |
2821 | ||
2822 | printk(signoff); | |
2823 | } | |
2824 | ||
2825 | module_exit(strip_exit_driver); | |
2826 | ||
2827 | MODULE_AUTHOR("Stuart Cheshire <cheshire@cs.stanford.edu>"); | |
2828 | MODULE_DESCRIPTION("Starmode Radio IP (STRIP) Device Driver"); | |
2829 | MODULE_LICENSE("Dual BSD/GPL"); | |
2830 | ||
2831 | MODULE_SUPPORTED_DEVICE("Starmode Radio IP (STRIP) modem"); |