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Root/drivers/net/wireless/strip.c

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/kernel.h>
85	#include <linux/module.h>
86	#include <linux/init.h>
87	#include <linux/bitops.h>
88	#include <asm/system.h>
89	#include <asm/uaccess.h>
90
91	# include <linux/ctype.h>
92	#include <linux/string.h>
93	#include <linux/mm.h>
94	#include <linux/interrupt.h>
95	#include <linux/in.h>
96	#include <linux/tty.h>
97	#include <linux/errno.h>
98	#include <linux/netdevice.h>
99	#include <linux/inetdevice.h>
100	#include <linux/etherdevice.h>
101	#include <linux/skbuff.h>
102	#include <linux/if_arp.h>
103	#include <linux/if_strip.h>
104	#include <linux/proc_fs.h>
105	#include <linux/seq_file.h>
106	#include <linux/serial.h>
107	#include <linux/serialP.h>
108	#include <linux/rcupdate.h>
109	#include <net/arp.h>
110	#include <net/net_namespace.h>
111
112	#include <linux/ip.h>
113	#include <linux/tcp.h>
114	#include <linux/time.h>
115	#include <linux/jiffies.h>
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>0000-1234SIP0<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 */
212	};
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 than 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[] = "&COMMANDATS319=7"; /* Turn on checksums & info messages */
383	static const char CommandString1[] = "&COMMANDATS305?"; /* Query radio name */
384	static const char CommandString2[] = "&COMMANDATS325?"; /* Query battery voltage */
385	static const char CommandString3[] = "&COMMANDATS300?"; /* Query version information */
386	static const char CommandString4[] = "&COMMANDATS311?"; /* Query poletop list */
387	static const char CommandString5[] = "&COMMANDAT~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	int ret = 0;
472
473	neighbor_entry = neigh_lookup(&arp_tbl, &paddr, dev);
474
475	if (neighbor_entry != NULL) {
476	neighbor_entry->used = jiffies;
477	if (neighbor_entry->nud_state & NUD_VALID) {
478	memcpy(haddr, neighbor_entry->ha, dev->addr_len);
479	ret = 1;
480	}
481	neigh_release(neighbor_entry);
482	}
483	return ret;
484	}
485
486	static void DumpData(char msg, struct strip strip_info, __u8 * ptr,
487	__u8 * end)
488	{
489	static const int MAX_DumpData = 80;
490	__u8 pkt_text[MAX_DumpData], *p = pkt_text;
491
492	*p++ = '\"';
493
494	while (ptr < end && p < &pkt_text[MAX_DumpData - 4]) {
495	if (*ptr == '\\') {
496	*p++ = '\\';
497	*p++ = '\\';
498	} else {
499	if (ptr >= 32 && ptr <= 126) {
500	p++ = ptr;
501	} else {
502	sprintf(p, "\\%02X", *ptr);
503	p += 3;
504	}
505	}
506	ptr++;
507	}
508
509	if (ptr == end)
510	*p++ = '\"';
511	*p++ = 0;
512
513	printk(KERN_INFO "%s: %-13s%s\n", strip_info->dev->name, msg, pkt_text);
514	}
515
516
517	/************************************************************************/
518	/* Byte stuffing/unstuffing routines */
519
520	/* Stuffing scheme:
521	* 00 Unused (reserved character)
522	* 01-3F Run of 2-64 different characters
523	* 40-7F Run of 1-64 different characters plus a single zero at the end
524	* 80-BF Run of 1-64 of the same character
525	* C0-FF Run of 1-64 zeroes (ASCII 0)
526	*/
527
528	typedef enum {
529	Stuff_Diff = 0x00,
530	Stuff_DiffZero = 0x40,
531	Stuff_Same = 0x80,
532	Stuff_Zero = 0xC0,
533	Stuff_NoCode = 0xFF, /* Special code, meaning no code selected */
534
535	Stuff_CodeMask = 0xC0,
536	Stuff_CountMask = 0x3F,
537	Stuff_MaxCount = 0x3F,
538	Stuff_Magic = 0x0D /* The value we are eliminating */
539	} StuffingCode;
540
541	/* StuffData encodes the data starting at "src" for "length" bytes.
542	* It writes it to the buffer pointed to by "dst" (which must be at least
543	* as long as 1 + 65/64 of the input length). The output may be up to 1.6%
544	* larger than the input for pathological input, but will usually be smaller.
545	* StuffData returns the new value of the dst pointer as its result.
546	* "code_ptr_ptr" points to a "__u8 *" which is used to hold encoding state
547	* between calls, allowing an encoded packet to be incrementally built up
548	* from small parts. On the first call, the "__u8 *" pointed to should be
549	* initialized to NULL; between subsequent calls the calling routine should
550	* leave the value alone and simply pass it back unchanged so that the
551	* encoder can recover its current state.
552	*/
553
554	#define StuffData_FinishBlock(X) \
555	(*code_ptr = (X) ^ Stuff_Magic, code = Stuff_NoCode)
556
557	static __u8 StuffData(__u8 src, __u32 length, __u8 * dst,
558	__u8 ** code_ptr_ptr)
559	{
560	__u8 *end = src + length;
561	__u8 code_ptr = code_ptr_ptr;
562	__u8 code = Stuff_NoCode, count = 0;
563
564	if (!length)
565	return (dst);
566
567	if (code_ptr) {
568	/*
569	* Recover state from last call, if applicable
570	*/
571	code = (*code_ptr ^ Stuff_Magic) & Stuff_CodeMask;
572	count = (*code_ptr ^ Stuff_Magic) & Stuff_CountMask;
573	}
574
575	while (src < end) {
576	switch (code) {
577	/* Stuff_NoCode: If no current code, select one */
578	case Stuff_NoCode:
579	/* Record where we're going to put this code */
580	code_ptr = dst++;
581	count = 0; /* Reset the count (zero means one instance) */
582	/* Tentatively start a new block */
583	if (*src == 0) {
584	code = Stuff_Zero;
585	src++;
586	} else {
587	code = Stuff_Same;
588	dst++ = src++ ^ Stuff_Magic;
589	}
590	/* Note: We optimistically assume run of same -- */
591	/* which will be fixed later in Stuff_Same */
592	/* if it turns out not to be true. */
593	break;
594
595	/* Stuff_Zero: We already have at least one zero encoded */
596	case Stuff_Zero:
597	/* If another zero, count it, else finish this code block */
598	if (*src == 0) {
599	count++;
600	src++;
601	} else {
602	StuffData_FinishBlock(Stuff_Zero + count);
603	}
604	break;
605
606	/* Stuff_Same: We already have at least one byte encoded */
607	case Stuff_Same:
608	/* If another one the same, count it */
609	if ((*src ^ Stuff_Magic) == code_ptr[1]) {
610	count++;
611	src++;
612	break;
613	}
614	/* else, this byte does not match this block. */
615	/* If we already have two or more bytes encoded, finish this code block */
616	if (count) {
617	StuffData_FinishBlock(Stuff_Same + count);
618	break;
619	}
620	/* else, we only have one so far, so switch to Stuff_Diff code */
621	code = Stuff_Diff;
622	/* and fall through to Stuff_Diff case below
623	* Note cunning cleverness here: case Stuff_Diff compares
624	* the current character with the previous two to see if it
625	* has a run of three the same. Won't this be an error if
626	* there aren't two previous characters stored to compare with?
627	* No. Because we know the current character is not the same
628	* as the previous one, the first test below will necessarily
629	* fail and the send half of the "if" won't be executed.
630	*/
631
632	/* Stuff_Diff: We have at least two different bytes encoded */
633	case Stuff_Diff:
634	/* If this is a zero, must encode a Stuff_DiffZero, and begin a new block */
635	if (*src == 0) {
636	StuffData_FinishBlock(Stuff_DiffZero +
637	count);
638	}
639	/* else, if we have three in a row, it is worth starting a Stuff_Same block */
640	else if ((*src ^ Stuff_Magic) == dst[-1]
641	&& dst[-1] == dst[-2]) {
642	/* Back off the last two characters we encoded */
643	code += count - 2;
644	/* Note: "Stuff_Diff + 0" is an illegal code */
645	if (code == Stuff_Diff + 0) {
646	code = Stuff_Same + 0;
647	}
648	StuffData_FinishBlock(code);
649	code_ptr = dst - 2;
650	/* dst[-1] already holds the correct value */
651	count = 2; /* 2 means three bytes encoded */
652	code = Stuff_Same;
653	}
654	/* else, another different byte, so add it to the block */
655	else {
656	dst++ = src ^ Stuff_Magic;
657	count++;
658	}
659	src++; /* Consume the byte */
660	break;
661	}
662	if (count == Stuff_MaxCount) {
663	StuffData_FinishBlock(code + count);
664	}
665	}
666	if (code == Stuff_NoCode) {
667	*code_ptr_ptr = NULL;
668	} else {
669	*code_ptr_ptr = code_ptr;
670	StuffData_FinishBlock(code + count);
671	}
672	return (dst);
673	}
674
675	/*
676	* UnStuffData decodes the data at "src", up to (but not including) "end".
677	* It writes the decoded data into the buffer pointed to by "dst", up to a
678	* maximum of "dst_length", and returns the new value of "src" so that a
679	* follow-on call can read more data, continuing from where the first left off.
680	*
681	* There are three types of results:
682	* 1. The source data runs out before extracting "dst_length" bytes:
683	* UnStuffData returns NULL to indicate failure.
684	* 2. The source data produces exactly "dst_length" bytes:
685	* UnStuffData returns new_src = end to indicate that all bytes were consumed.
686	* 3. "dst_length" bytes are extracted, with more remaining.
687	* UnStuffData returns new_src < end to indicate that there are more bytes
688	* to be read.
689	*
690	* Note: The decoding may be destructive, in that it may alter the source
691	* data in the process of decoding it (this is necessary to allow a follow-on
692	* call to resume correctly).
693	*/
694
695	static __u8 UnStuffData(__u8 src, __u8 * end, __u8 * dst,
696	__u32 dst_length)
697	{
698	__u8 *dst_end = dst + dst_length;
699	/* Sanity check */
700	if (!src \|\| !end \|\| !dst \|\| !dst_length)
701	return (NULL);
702	while (src < end && dst < dst_end) {
703	int count = (*src ^ Stuff_Magic) & Stuff_CountMask;
704	switch ((*src ^ Stuff_Magic) & Stuff_CodeMask) {
705	case Stuff_Diff:
706	if (src + 1 + count >= end)
707	return (NULL);
708	do {
709	dst++ = ++src ^ Stuff_Magic;
710	}
711	while (--count >= 0 && dst < dst_end);
712	if (count < 0)
713	src += 1;
714	else {
715	if (count == 0)
716	*src = Stuff_Same ^ Stuff_Magic;
717	else
718	*src =
719	(Stuff_Diff +
720	count) ^ Stuff_Magic;
721	}
722	break;
723	case Stuff_DiffZero:
724	if (src + 1 + count >= end)
725	return (NULL);
726	do {
727	dst++ = ++src ^ Stuff_Magic;
728	}
729	while (--count >= 0 && dst < dst_end);
730	if (count < 0)
731	*src = Stuff_Zero ^ Stuff_Magic;
732	else
733	*src =
734	(Stuff_DiffZero + count) ^ Stuff_Magic;
735	break;
736	case Stuff_Same:
737	if (src + 1 >= end)
738	return (NULL);
739	do {
740	*dst++ = src[1] ^ Stuff_Magic;
741	}
742	while (--count >= 0 && dst < dst_end);
743	if (count < 0)
744	src += 2;
745	else
746	*src = (Stuff_Same + count) ^ Stuff_Magic;
747	break;
748	case Stuff_Zero:
749	do {
750	*dst++ = 0;
751	}
752	while (--count >= 0 && dst < dst_end);
753	if (count < 0)
754	src += 1;
755	else
756	*src = (Stuff_Zero + count) ^ Stuff_Magic;
757	break;
758	}
759	}
760	if (dst < dst_end)
761	return (NULL);
762	else
763	return (src);
764	}
765
766
767	/************************************************************************/
768	/* General routines for STRIP */
769
770	/*
771	* set_baud sets the baud rate to the rate defined by baudcode
772	*/
773	static void set_baud(struct tty_struct *tty, speed_t baudrate)
774	{
775	struct ktermios old_termios;
776
777	mutex_lock(&tty->termios_mutex);
778	old_termios =*(tty->termios);
779	tty_encode_baud_rate(tty, baudrate, baudrate);
780	tty->ops->set_termios(tty, &old_termios);
781	mutex_unlock(&tty->termios_mutex);
782	}
783
784	/*
785	* Convert a string to a Metricom Address.
786	*/
787
788	#define IS_RADIO_ADDRESS(p) ( \
789	isdigit((p)[0]) && isdigit((p)[1]) && isdigit((p)[2]) && isdigit((p)[3]) && \
790	(p)[4] == '-' && \
791	isdigit((p)[5]) && isdigit((p)[6]) && isdigit((p)[7]) && isdigit((p)[8]) )
792
793	static int string_to_radio_address(MetricomAddress * addr, __u8 * p)
794	{
795	if (!IS_RADIO_ADDRESS(p))
796	return (1);
797	addr->c[0] = 0;
798	addr->c[1] = 0;
799	addr->c[2] = READHEX(p[0]) << 4 \| READHEX(p[1]);
800	addr->c[3] = READHEX(p[2]) << 4 \| READHEX(p[3]);
801	addr->c[4] = READHEX(p[5]) << 4 \| READHEX(p[6]);
802	addr->c[5] = READHEX(p[7]) << 4 \| READHEX(p[8]);
803	return (0);
804	}
805
806	/*
807	* Convert a Metricom Address to a string.
808	*/
809
810	static __u8 radio_address_to_string(const MetricomAddress addr,
811	MetricomAddressString * p)
812	{
813	sprintf(p->c, "%02X%02X-%02X%02X", addr->c[2], addr->c[3],
814	addr->c[4], addr->c[5]);
815	return (p->c);
816	}
817
818	/*
819	* Note: Must make sure sx_size is big enough to receive a stuffed
820	* MAX_RECV_MTU packet. Additionally, we also want to ensure that it's
821	* big enough to receive a large radio neighbour list (currently 4K).
822	*/
823
824	static int allocate_buffers(struct strip *strip_info, int mtu)
825	{
826	struct net_device *dev = strip_info->dev;
827	int sx_size = max_t(int, STRIP_ENCAP_SIZE(MAX_RECV_MTU), 4096);
828	int tx_size = STRIP_ENCAP_SIZE(mtu) + MaxCommandStringLength;
829	__u8 *r = kmalloc(MAX_RECV_MTU, GFP_ATOMIC);
830	__u8 *s = kmalloc(sx_size, GFP_ATOMIC);
831	__u8 *t = kmalloc(tx_size, GFP_ATOMIC);
832	if (r && s && t) {
833	strip_info->rx_buff = r;
834	strip_info->sx_buff = s;
835	strip_info->tx_buff = t;
836	strip_info->sx_size = sx_size;
837	strip_info->tx_size = tx_size;
838	strip_info->mtu = dev->mtu = mtu;
839	return (1);
840	}
841	kfree(r);
842	kfree(s);
843	kfree(t);
844	return (0);
845	}
846
847	/*
848	* MTU has been changed by the IP layer.
849	* We could be in
850	* an upcall from the tty driver, or in an ip packet queue.
851	*/
852	static int strip_change_mtu(struct net_device *dev, int new_mtu)
853	{
854	struct strip *strip_info = netdev_priv(dev);
855	int old_mtu = strip_info->mtu;
856	unsigned char *orbuff = strip_info->rx_buff;
857	unsigned char *osbuff = strip_info->sx_buff;
858	unsigned char *otbuff = strip_info->tx_buff;
859
860	if (new_mtu > MAX_SEND_MTU) {
861	printk(KERN_ERR
862	"%s: MTU exceeds maximum allowable (%d), MTU change cancelled.\n",
863	strip_info->dev->name, MAX_SEND_MTU);
864	return -EINVAL;
865	}
866
867	spin_lock_bh(&strip_lock);
868	if (!allocate_buffers(strip_info, new_mtu)) {
869	printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n",
870	strip_info->dev->name);
871	spin_unlock_bh(&strip_lock);
872	return -ENOMEM;
873	}
874
875	if (strip_info->sx_count) {
876	if (strip_info->sx_count <= strip_info->sx_size)
877	memcpy(strip_info->sx_buff, osbuff,
878	strip_info->sx_count);
879	else {
880	strip_info->discard = strip_info->sx_count;
881	strip_info->rx_over_errors++;
882	}
883	}
884
885	if (strip_info->tx_left) {
886	if (strip_info->tx_left <= strip_info->tx_size)
887	memcpy(strip_info->tx_buff, strip_info->tx_head,
888	strip_info->tx_left);
889	else {
890	strip_info->tx_left = 0;
891	strip_info->tx_dropped++;
892	}
893	}
894	strip_info->tx_head = strip_info->tx_buff;
895	spin_unlock_bh(&strip_lock);
896
897	printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n",
898	strip_info->dev->name, old_mtu, strip_info->mtu);
899
900	kfree(orbuff);
901	kfree(osbuff);
902	kfree(otbuff);
903	return 0;
904	}
905
906	static void strip_unlock(struct strip *strip_info)
907	{
908	/*
909	* Set the timer to go off in one second.
910	*/
911	strip_info->idle_timer.expires = jiffies + 1 * HZ;
912	add_timer(&strip_info->idle_timer);
913	netif_wake_queue(strip_info->dev);
914	}
915
916
917
918	/*
919	* If the time is in the near future, time_delta prints the number of
920	* seconds to go into the buffer and returns the address of the buffer.
921	* If the time is not in the near future, it returns the address of the
922	* string "Not scheduled" The buffer must be long enough to contain the
923	* ascii representation of the number plus 9 charactes for the " seconds"
924	* and the null character.
925	*/
926	#ifdef CONFIG_PROC_FS
927	static char *time_delta(char buffer[], long time)
928	{
929	time -= jiffies;
930	if (time > LongTime / 2)
931	return ("Not scheduled");
932	if (time < 0)
933	time = 0; /* Don't print negative times */
934	sprintf(buffer, "%ld seconds", time / HZ);
935	return (buffer);
936	}
937
938	/* get Nth element of the linked list */
939	static struct strip *strip_get_idx(loff_t pos)
940	{
941	struct strip *str;
942	int i = 0;
943
944	list_for_each_entry_rcu(str, &strip_list, list) {
945	if (pos == i)
946	return str;
947	++i;
948	}
949	return NULL;
950	}
951
952	static void strip_seq_start(struct seq_file seq, loff_t *pos)
953	__acquires(RCU)
954	{
955	rcu_read_lock();
956	return pos ? strip_get_idx(pos - 1) : SEQ_START_TOKEN;
957	}
958
959	static void strip_seq_next(struct seq_file seq, void v, loff_t pos)
960	{
961	struct list_head *l;
962	struct strip *s;
963
964	++*pos;
965	if (v == SEQ_START_TOKEN)
966	return strip_get_idx(1);
967
968	s = v;
969	l = &s->list;
970	list_for_each_continue_rcu(l, &strip_list) {
971	return list_entry(l, struct strip, list);
972	}
973	return NULL;
974	}
975
976	static void strip_seq_stop(struct seq_file seq, void v)
977	__releases(RCU)
978	{
979	rcu_read_unlock();
980	}
981
982	static void strip_seq_neighbours(struct seq_file *seq,
983	const MetricomNodeTable * table,
984	const char *title)
985	{
986	/* We wrap this in a do/while loop, so if the table changes */
987	/* while we're reading it, we just go around and try again. */
988	struct timeval t;
989
990	do {
991	int i;
992	t = table->timestamp;
993	if (table->num_nodes)
994	seq_printf(seq, "\n %s\n", title);
995	for (i = 0; i < table->num_nodes; i++) {
996	MetricomNode node;
997
998	spin_lock_bh(&strip_lock);
999	node = table->node[i];
1000	spin_unlock_bh(&strip_lock);
1001	seq_printf(seq, " %s\n", node.c);
1002	}
1003	} while (table->timestamp.tv_sec != t.tv_sec
1004	\|\| table->timestamp.tv_usec != t.tv_usec);
1005	}
1006
1007	/*
1008	* This function prints radio status information via the seq_file
1009	* interface. The interface takes care of buffer size and over
1010	* run issues.
1011	*
1012	* The buffer in seq_file is PAGESIZE (4K)
1013	* so this routine should never print more or it will get truncated.
1014	* With the maximum of 32 portables and 32 poletops
1015	* reported, the routine outputs 3107 bytes into the buffer.
1016	*/
1017	static void strip_seq_status_info(struct seq_file *seq,
1018	const struct strip *strip_info)
1019	{
1020	char temp[32];
1021	MetricomAddressString addr_string;
1022
1023	/* First, we must copy all of our data to a safe place, */
1024	/* in case a serial interrupt comes in and changes it. */
1025	int tx_left = strip_info->tx_left;
1026	unsigned long rx_average_pps = strip_info->rx_average_pps;
1027	unsigned long tx_average_pps = strip_info->tx_average_pps;
1028	unsigned long sx_average_pps = strip_info->sx_average_pps;
1029	int working = strip_info->working;
1030	int firmware_level = strip_info->firmware_level;
1031	long watchdog_doprobe = strip_info->watchdog_doprobe;
1032	long watchdog_doreset = strip_info->watchdog_doreset;
1033	long gratuitous_arp = strip_info->gratuitous_arp;
1034	long arp_interval = strip_info->arp_interval;
1035	FirmwareVersion firmware_version = strip_info->firmware_version;
1036	SerialNumber serial_number = strip_info->serial_number;
1037	BatteryVoltage battery_voltage = strip_info->battery_voltage;
1038	char *if_name = strip_info->dev->name;
1039	MetricomAddress true_dev_addr = strip_info->true_dev_addr;
1040	MetricomAddress dev_dev_addr =
1041	(MetricomAddress ) strip_info->dev->dev_addr;
1042	int manual_dev_addr = strip_info->manual_dev_addr;
1043	#ifdef EXT_COUNTERS
1044	unsigned long rx_bytes = strip_info->rx_bytes;
1045	unsigned long tx_bytes = strip_info->tx_bytes;
1046	unsigned long rx_rbytes = strip_info->rx_rbytes;
1047	unsigned long tx_rbytes = strip_info->tx_rbytes;
1048	unsigned long rx_sbytes = strip_info->rx_sbytes;
1049	unsigned long tx_sbytes = strip_info->tx_sbytes;
1050	unsigned long rx_ebytes = strip_info->rx_ebytes;
1051	unsigned long tx_ebytes = strip_info->tx_ebytes;
1052	#endif
1053
1054	seq_printf(seq, "\nInterface name\t\t%s\n", if_name);
1055	seq_printf(seq, " Radio working:\t\t%s\n", working ? "Yes" : "No");
1056	radio_address_to_string(&true_dev_addr, &addr_string);
1057	seq_printf(seq, " Radio address:\t\t%s\n", addr_string.c);
1058	if (manual_dev_addr) {
1059	radio_address_to_string(&dev_dev_addr, &addr_string);
1060	seq_printf(seq, " Device address:\t%s\n", addr_string.c);
1061	}
1062	seq_printf(seq, " Firmware version:\t%s", !working ? "Unknown" :
1063	!firmware_level ? "Should be upgraded" :
1064	firmware_version.c);
1065	if (firmware_level >= ChecksummedMessages)
1066	seq_printf(seq, " (Checksums Enabled)");
1067	seq_printf(seq, "\n");
1068	seq_printf(seq, " Serial number:\t\t%s\n", serial_number.c);
1069	seq_printf(seq, " Battery voltage:\t%s\n", battery_voltage.c);
1070	seq_printf(seq, " Transmit queue (bytes):%d\n", tx_left);
1071	seq_printf(seq, " Receive packet rate: %ld packets per second\n",
1072	rx_average_pps / 8);
1073	seq_printf(seq, " Transmit packet rate: %ld packets per second\n",
1074	tx_average_pps / 8);
1075	seq_printf(seq, " Sent packet rate: %ld packets per second\n",
1076	sx_average_pps / 8);
1077	seq_printf(seq, " Next watchdog probe:\t%s\n",
1078	time_delta(temp, watchdog_doprobe));
1079	seq_printf(seq, " Next watchdog reset:\t%s\n",
1080	time_delta(temp, watchdog_doreset));
1081	seq_printf(seq, " Next gratuitous ARP:\t");
1082
1083	if (!memcmp
1084	(strip_info->dev->dev_addr, zero_address.c,
1085	sizeof(zero_address)))
1086	seq_printf(seq, "Disabled\n");
1087	else {
1088	seq_printf(seq, "%s\n", time_delta(temp, gratuitous_arp));
1089	seq_printf(seq, " Next ARP interval:\t%ld seconds\n",
1090	JIFFIE_TO_SEC(arp_interval));
1091	}
1092
1093	if (working) {
1094	#ifdef EXT_COUNTERS
1095	seq_printf(seq, "\n");
1096	seq_printf(seq,
1097	" Total bytes: \trx:\t%lu\ttx:\t%lu\n",
1098	rx_bytes, tx_bytes);
1099	seq_printf(seq,
1100	" thru radio: \trx:\t%lu\ttx:\t%lu\n",
1101	rx_rbytes, tx_rbytes);
1102	seq_printf(seq,
1103	" thru serial port: \trx:\t%lu\ttx:\t%lu\n",
1104	rx_sbytes, tx_sbytes);
1105	seq_printf(seq,
1106	" Total stat/err bytes:\trx:\t%lu\ttx:\t%lu\n",
1107	rx_ebytes, tx_ebytes);
1108	#endif
1109	strip_seq_neighbours(seq, &strip_info->poletops,
1110	"Poletops:");
1111	strip_seq_neighbours(seq, &strip_info->portables,
1112	"Portables:");
1113	}
1114	}
1115
1116	/*
1117	* This function is exports status information from the STRIP driver through
1118	* the /proc file system.
1119	*/
1120	static int strip_seq_show(struct seq_file seq, void v)
1121	{
1122	if (v == SEQ_START_TOKEN)
1123	seq_printf(seq, "strip_version: %s\n", StripVersion);
1124	else
1125	strip_seq_status_info(seq, (const struct strip *)v);
1126	return 0;
1127	}
1128
1129
1130	static const struct seq_operations strip_seq_ops = {
1131	.start = strip_seq_start,
1132	.next = strip_seq_next,
1133	.stop = strip_seq_stop,
1134	.show = strip_seq_show,
1135	};
1136
1137	static int strip_seq_open(struct inode inode, struct file file)
1138	{
1139	return seq_open(file, &strip_seq_ops);
1140	}
1141
1142	static const struct file_operations strip_seq_fops = {
1143	.owner = THIS_MODULE,
1144	.open = strip_seq_open,
1145	.read = seq_read,
1146	.llseek = seq_lseek,
1147	.release = seq_release,
1148	};
1149	#endif
1150
1151
1152
1153	/************************************************************************/
1154	/* Sending routines */
1155
1156	static void ResetRadio(struct strip *strip_info)
1157	{
1158	struct tty_struct *tty = strip_info->tty;
1159	static const char init[] = "ate0q1dtstarmode\r";
1160	StringDescriptor s = { init, sizeof(init) - 1 };
1161
1162	/*
1163	* If the radio isn't working anymore,
1164	* we should clear the old status information.
1165	*/
1166	if (strip_info->working) {
1167	printk(KERN_INFO "%s: No response: Resetting radio.\n",
1168	strip_info->dev->name);
1169	strip_info->firmware_version.c[0] = '\0';
1170	strip_info->serial_number.c[0] = '\0';
1171	strip_info->battery_voltage.c[0] = '\0';
1172	strip_info->portables.num_nodes = 0;
1173	do_gettimeofday(&strip_info->portables.timestamp);
1174	strip_info->poletops.num_nodes = 0;
1175	do_gettimeofday(&strip_info->poletops.timestamp);
1176	}
1177
1178	strip_info->pps_timer = jiffies;
1179	strip_info->rx_pps_count = 0;
1180	strip_info->tx_pps_count = 0;
1181	strip_info->sx_pps_count = 0;
1182	strip_info->rx_average_pps = 0;
1183	strip_info->tx_average_pps = 0;
1184	strip_info->sx_average_pps = 0;
1185
1186	/* Mark radio address as unknown */
1187	(MetricomAddress ) & strip_info->true_dev_addr = zero_address;
1188	if (!strip_info->manual_dev_addr)
1189	(MetricomAddress ) strip_info->dev->dev_addr =
1190	zero_address;
1191	strip_info->working = FALSE;
1192	strip_info->firmware_level = NoStructure;
1193	strip_info->next_command = CompatibilityCommand;
1194	strip_info->watchdog_doprobe = jiffies + 10 * HZ;
1195	strip_info->watchdog_doreset = jiffies + 1 * HZ;
1196
1197	/* If the user has selected a baud rate above 38.4 see what magic we have to do */
1198	if (strip_info->user_baud > 38400) {
1199	/*
1200	* Subtle stuff: Pay attention :-)
1201	* If the serial port is currently at the user's selected (>38.4) rate,
1202	* then we temporarily switch to 19.2 and issue the ATS304 command
1203	* to tell the radio to switch to the user's selected rate.
1204	* If the serial port is not currently at that rate, that means we just
1205	* issued the ATS304 command last time through, so this time we restore
1206	* the user's selected rate and issue the normal starmode reset string.
1207	*/
1208	if (strip_info->user_baud == tty_get_baud_rate(tty)) {
1209	static const char b0[] = "ate0q1s304=57600\r";
1210	static const char b1[] = "ate0q1s304=115200\r";
1211	static const StringDescriptor baudstring[2] =
1212	{ {b0, sizeof(b0) - 1}
1213	, {b1, sizeof(b1) - 1}
1214	};
1215	set_baud(tty, 19200);
1216	if (strip_info->user_baud == 57600)
1217	s = baudstring[0];
1218	else if (strip_info->user_baud == 115200)
1219	s = baudstring[1];
1220	else
1221	s = baudstring[1]; /* For now */
1222	} else
1223	set_baud(tty, strip_info->user_baud);
1224	}
1225
1226	tty->ops->write(tty, s.string, s.length);
1227	#ifdef EXT_COUNTERS
1228	strip_info->tx_ebytes += s.length;
1229	#endif
1230	}
1231
1232	/*
1233	* Called by the driver when there's room for more data. If we have
1234	* more packets to send, we send them here.
1235	*/
1236
1237	static void strip_write_some_more(struct tty_struct *tty)
1238	{
1239	struct strip *strip_info = tty->disc_data;
1240
1241	/* First make sure we're connected. */
1242	if (!strip_info \|\| strip_info->magic != STRIP_MAGIC \|\|
1243	!netif_running(strip_info->dev))
1244	return;
1245
1246	if (strip_info->tx_left > 0) {
1247	int num_written =
1248	tty->ops->write(tty, strip_info->tx_head,
1249	strip_info->tx_left);
1250	strip_info->tx_left -= num_written;
1251	strip_info->tx_head += num_written;
1252	#ifdef EXT_COUNTERS
1253	strip_info->tx_sbytes += num_written;
1254	#endif
1255	} else { /* Else start transmission of another packet */
1256
1257	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
1258	strip_unlock(strip_info);
1259	}
1260	}
1261
1262	static __u8 add_checksum(__u8 buffer, __u8 * end)
1263	{
1264	__u16 sum = 0;
1265	__u8 *p = buffer;
1266	while (p < end)
1267	sum += *p++;
1268	end[3] = hextable[sum & 0xF];
1269	sum >>= 4;
1270	end[2] = hextable[sum & 0xF];
1271	sum >>= 4;
1272	end[1] = hextable[sum & 0xF];
1273	sum >>= 4;
1274	end[0] = hextable[sum & 0xF];
1275	return (end + 4);
1276	}
1277
1278	static unsigned char strip_make_packet(unsigned char buffer,
1279	struct strip *strip_info,
1280	struct sk_buff *skb)
1281	{
1282	__u8 *ptr = buffer;
1283	__u8 *stuffstate = NULL;
1284	STRIP_Header header = (STRIP_Header ) skb->data;
1285	MetricomAddress haddr = header->dst_addr;
1286	int len = skb->len - sizeof(STRIP_Header);
1287	MetricomKey key;
1288
1289	/HexDump("strip_make_packet", strip_info, skb->data, skb->data + skb->len); /
1290
1291	if (header->protocol == htons(ETH_P_IP))
1292	key = SIP0Key;
1293	else if (header->protocol == htons(ETH_P_ARP))
1294	key = ARP0Key;
1295	else {
1296	printk(KERN_ERR
1297	"%s: strip_make_packet: Unknown packet type 0x%04X\n",
1298	strip_info->dev->name, ntohs(header->protocol));
1299	return (NULL);
1300	}
1301
1302	if (len > strip_info->mtu) {
1303	printk(KERN_ERR
1304	"%s: Dropping oversized transmit packet: %d bytes\n",
1305	strip_info->dev->name, len);
1306	return (NULL);
1307	}
1308
1309	/*
1310	* If we're sending to ourselves, discard the packet.
1311	* (Metricom radios choke if they try to send a packet to their own address.)
1312	*/
1313	if (!memcmp(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) {
1314	printk(KERN_ERR "%s: Dropping packet addressed to self\n",
1315	strip_info->dev->name);
1316	return (NULL);
1317	}
1318
1319	/*
1320	* If this is a broadcast packet, send it to our designated Metricom
1321	* 'broadcast hub' radio (First byte of address being 0xFF means broadcast)
1322	*/
1323	if (haddr.c[0] == 0xFF) {
1324	__be32 brd = 0;
1325	struct in_device *in_dev;
1326
1327	rcu_read_lock();
1328	in_dev = __in_dev_get_rcu(strip_info->dev);
1329	if (in_dev == NULL) {
1330	rcu_read_unlock();
1331	return NULL;
1332	}
1333	if (in_dev->ifa_list)
1334	brd = in_dev->ifa_list->ifa_broadcast;
1335	rcu_read_unlock();
1336
1337	/* arp_query returns 1 if it succeeds in looking up the address, 0 if it fails */
1338	if (!arp_query(haddr.c, brd, strip_info->dev)) {
1339	printk(KERN_ERR
1340	"%s: Unable to send packet (no broadcast hub configured)\n",
1341	strip_info->dev->name);
1342	return (NULL);
1343	}
1344	/*
1345	* If we are the broadcast hub, don't bother sending to ourselves.
1346	* (Metricom radios choke if they try to send a packet to their own address.)
1347	*/
1348	if (!memcmp
1349	(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr)))
1350	return (NULL);
1351	}
1352
1353	*ptr++ = 0x0D;
1354	ptr++ = '';
1355	*ptr++ = hextable[haddr.c[2] >> 4];
1356	*ptr++ = hextable[haddr.c[2] & 0xF];
1357	*ptr++ = hextable[haddr.c[3] >> 4];
1358	*ptr++ = hextable[haddr.c[3] & 0xF];
1359	*ptr++ = '-';
1360	*ptr++ = hextable[haddr.c[4] >> 4];
1361	*ptr++ = hextable[haddr.c[4] & 0xF];
1362	*ptr++ = hextable[haddr.c[5] >> 4];
1363	*ptr++ = hextable[haddr.c[5] & 0xF];
1364	ptr++ = '';
1365	*ptr++ = key.c[0];
1366	*ptr++ = key.c[1];
1367	*ptr++ = key.c[2];
1368	*ptr++ = key.c[3];
1369
1370	ptr =
1371	StuffData(skb->data + sizeof(STRIP_Header), len, ptr,
1372	&stuffstate);
1373
1374	if (strip_info->firmware_level >= ChecksummedMessages)
1375	ptr = add_checksum(buffer + 1, ptr);
1376
1377	*ptr++ = 0x0D;
1378	return (ptr);
1379	}
1380
1381	static void strip_send(struct strip strip_info, struct sk_buff skb)
1382	{
1383	MetricomAddress haddr;
1384	unsigned char *ptr = strip_info->tx_buff;
1385	int doreset = (long) jiffies - strip_info->watchdog_doreset >= 0;
1386	int doprobe = (long) jiffies - strip_info->watchdog_doprobe >= 0
1387	&& !doreset;
1388	__be32 addr, brd;
1389
1390	/*
1391	* 1. If we have a packet, encapsulate it and put it in the buffer
1392	*/
1393	if (skb) {
1394	char *newptr = strip_make_packet(ptr, strip_info, skb);
1395	strip_info->tx_pps_count++;
1396	if (!newptr)
1397	strip_info->tx_dropped++;
1398	else {
1399	ptr = newptr;
1400	strip_info->sx_pps_count++;
1401	strip_info->tx_packets++; /* Count another successful packet */
1402	#ifdef EXT_COUNTERS
1403	strip_info->tx_bytes += skb->len;
1404	strip_info->tx_rbytes += ptr - strip_info->tx_buff;
1405	#endif
1406	/DumpData("Sending:", strip_info, strip_info->tx_buff, ptr); /
1407	/HexDump("Sending", strip_info, strip_info->tx_buff, ptr); /
1408	}
1409	}
1410
1411	/*
1412	* 2. If it is time for another tickle, tack it on, after the packet
1413	*/
1414	if (doprobe) {
1415	StringDescriptor ts = CommandString[strip_info->next_command];
1416	#if TICKLE_TIMERS
1417	{
1418	struct timeval tv;
1419	do_gettimeofday(&tv);
1420	printk(KERN_INFO "**** Sending tickle string %d at %02d.%06d\n",
1421	strip_info->next_command, tv.tv_sec % 100,
1422	tv.tv_usec);
1423	}
1424	#endif
1425	if (ptr == strip_info->tx_buff)
1426	*ptr++ = 0x0D;
1427
1428	ptr++ = ''; /* First send "*" to provoke an error message /
1429	ptr++ = '';
1430
1431	/* Then add the command */
1432	memcpy(ptr, ts.string, ts.length);
1433
1434	/* Add a checksum ? */
1435	if (strip_info->firmware_level < ChecksummedMessages)
1436	ptr += ts.length;
1437	else
1438	ptr = add_checksum(ptr, ptr + ts.length);
1439
1440	ptr++ = 0x0D; / Terminate the command with a <CR> */
1441
1442	/* Cycle to next periodic command? */
1443	if (strip_info->firmware_level >= StructuredMessages)
1444	if (++strip_info->next_command >=
1445	ARRAY_SIZE(CommandString))
1446	strip_info->next_command = 0;
1447	#ifdef EXT_COUNTERS
1448	strip_info->tx_ebytes += ts.length;
1449	#endif
1450	strip_info->watchdog_doprobe = jiffies + 10 * HZ;
1451	strip_info->watchdog_doreset = jiffies + 1 * HZ;
1452	/printk(KERN_INFO "%s: Routine radio test.\n", strip_info->dev->name); /
1453	}
1454
1455	/*
1456	* 3. Set up the strip_info ready to send the data (if any).
1457	*/
1458	strip_info->tx_head = strip_info->tx_buff;
1459	strip_info->tx_left = ptr - strip_info->tx_buff;
1460	set_bit(TTY_DO_WRITE_WAKEUP, &strip_info->tty->flags);
1461	/*
1462	* 4. Debugging check to make sure we're not overflowing the buffer.
1463	*/
1464	if (strip_info->tx_size - strip_info->tx_left < 20)
1465	printk(KERN_ERR "%s: Sending%5d bytes;%5d bytes free.\n",
1466	strip_info->dev->name, strip_info->tx_left,
1467	strip_info->tx_size - strip_info->tx_left);
1468
1469	/*
1470	* 5. If watchdog has expired, reset the radio. Note: if there's data waiting in
1471	* the buffer, strip_write_some_more will send it after the reset has finished
1472	*/
1473	if (doreset) {
1474	ResetRadio(strip_info);
1475	return;
1476	}
1477
1478	if (1) {
1479	struct in_device *in_dev;
1480
1481	brd = addr = 0;
1482	rcu_read_lock();
1483	in_dev = __in_dev_get_rcu(strip_info->dev);
1484	if (in_dev) {
1485	if (in_dev->ifa_list) {
1486	brd = in_dev->ifa_list->ifa_broadcast;
1487	addr = in_dev->ifa_list->ifa_local;
1488	}
1489	}
1490	rcu_read_unlock();
1491	}
1492
1493
1494	/*
1495	* 6. If it is time for a periodic ARP, queue one up to be sent.
1496	* We only do this if:
1497	* 1. The radio is working
1498	* 2. It's time to send another periodic ARP
1499	* 3. We really know what our address is (and it is not manually set to zero)
1500	* 4. We have a designated broadcast address configured
1501	* If we queue up an ARP packet when we don't have a designated broadcast
1502	* address configured, then the packet will just have to be discarded in
1503	* strip_make_packet. This is not fatal, but it causes misleading information
1504	* to be displayed in tcpdump. tcpdump will report that periodic APRs are
1505	* being sent, when in fact they are not, because they are all being dropped
1506	* in the strip_make_packet routine.
1507	*/
1508	if (strip_info->working
1509	&& (long) jiffies - strip_info->gratuitous_arp >= 0
1510	&& memcmp(strip_info->dev->dev_addr, zero_address.c,
1511	sizeof(zero_address))
1512	&& arp_query(haddr.c, brd, strip_info->dev)) {
1513	/*printk(KERN_INFO "%s: Sending gratuitous ARP with interval %ld\n",
1514	strip_info->dev->name, strip_info->arp_interval / HZ); */
1515	strip_info->gratuitous_arp =
1516	jiffies + strip_info->arp_interval;
1517	strip_info->arp_interval *= 2;
1518	if (strip_info->arp_interval > MaxARPInterval)
1519	strip_info->arp_interval = MaxARPInterval;
1520	if (addr)
1521	arp_send(ARPOP_REPLY, ETH_P_ARP, addr, /* Target address of ARP packet is our address */
1522	strip_info->dev, /* Device to send packet on */
1523	addr, /* Source IP address this ARP packet comes from */
1524	NULL, /* Destination HW address is NULL (broadcast it) */
1525	strip_info->dev->dev_addr, /* Source HW address is our HW address */
1526	strip_info->dev->dev_addr); /* Target HW address is our HW address (redundant) */
1527	}
1528
1529	/*
1530	* 7. All ready. Start the transmission
1531	*/
1532	strip_write_some_more(strip_info->tty);
1533	}
1534
1535	/* Encapsulate a datagram and kick it into a TTY queue. */
1536	static int strip_xmit(struct sk_buff skb, struct net_device dev)
1537	{
1538	struct strip *strip_info = netdev_priv(dev);
1539
1540	if (!netif_running(dev)) {
1541	printk(KERN_ERR "%s: xmit call when iface is down\n",
1542	dev->name);
1543	return NETDEV_TX_BUSY;
1544	}
1545
1546	netif_stop_queue(dev);
1547
1548	del_timer(&strip_info->idle_timer);
1549
1550
1551	if (time_after(jiffies, strip_info->pps_timer + HZ)) {
1552	unsigned long t = jiffies - strip_info->pps_timer;
1553	unsigned long rx_pps_count = (strip_info->rx_pps_count * HZ * 8 + t / 2) / t;
1554	unsigned long tx_pps_count = (strip_info->tx_pps_count * HZ * 8 + t / 2) / t;
1555	unsigned long sx_pps_count = (strip_info->sx_pps_count * HZ * 8 + t / 2) / t;
1556
1557	strip_info->pps_timer = jiffies;
1558	strip_info->rx_pps_count = 0;
1559	strip_info->tx_pps_count = 0;
1560	strip_info->sx_pps_count = 0;
1561
1562	strip_info->rx_average_pps = (strip_info->rx_average_pps + rx_pps_count + 1) / 2;
1563	strip_info->tx_average_pps = (strip_info->tx_average_pps + tx_pps_count + 1) / 2;
1564	strip_info->sx_average_pps = (strip_info->sx_average_pps + sx_pps_count + 1) / 2;
1565
1566	if (rx_pps_count / 8 >= 10)
1567	printk(KERN_INFO "%s: WARNING: Receiving %ld packets per second.\n",
1568	strip_info->dev->name, rx_pps_count / 8);
1569	if (tx_pps_count / 8 >= 10)
1570	printk(KERN_INFO "%s: WARNING: Tx %ld packets per second.\n",
1571	strip_info->dev->name, tx_pps_count / 8);
1572	if (sx_pps_count / 8 >= 10)
1573	printk(KERN_INFO "%s: WARNING: Sending %ld packets per second.\n",
1574	strip_info->dev->name, sx_pps_count / 8);
1575	}
1576
1577	spin_lock_bh(&strip_lock);
1578
1579	strip_send(strip_info, skb);
1580
1581	spin_unlock_bh(&strip_lock);
1582
1583	if (skb)
1584	dev_kfree_skb(skb);
1585	return 0;
1586	}
1587
1588	/*
1589	* IdleTask periodically calls strip_xmit, so even when we have no IP packets
1590	* to send for an extended period of time, the watchdog processing still gets
1591	* done to ensure that the radio stays in Starmode
1592	*/
1593
1594	static void strip_IdleTask(unsigned long parameter)
1595	{
1596	strip_xmit(NULL, (struct net_device *) parameter);
1597	}
1598
1599	/*
1600	* Create the MAC header for an arbitrary protocol layer
1601	*
1602	* saddr!=NULL means use this specific address (n/a for Metricom)
1603	* saddr==NULL means use default device source address
1604	* daddr!=NULL means use this destination address
1605	* daddr==NULL means leave destination address alone
1606	* (e.g. unresolved arp -- kernel will call
1607	* rebuild_header later to fill in the address)
1608	*/
1609
1610	static int strip_header(struct sk_buff skb, struct net_device dev,
1611	unsigned short type, const void *daddr,
1612	const void *saddr, unsigned len)
1613	{
1614	struct strip *strip_info = netdev_priv(dev);
1615	STRIP_Header header = (STRIP_Header ) skb_push(skb, sizeof(STRIP_Header));
1616
1617	/*printk(KERN_INFO "%s: strip_header 0x%04X %s\n", dev->name, type,
1618	type == ETH_P_IP ? "IP" : type == ETH_P_ARP ? "ARP" : ""); */
1619
1620	header->src_addr = strip_info->true_dev_addr;
1621	header->protocol = htons(type);
1622
1623	/HexDump("strip_header", netdev_priv(dev), skb->data, skb->data + skb->len); /
1624
1625	if (!daddr)
1626	return (-dev->hard_header_len);
1627
1628	header->dst_addr = (MetricomAddress ) daddr;
1629	return (dev->hard_header_len);
1630	}
1631
1632	/*
1633	* Rebuild the MAC header. This is called after an ARP
1634	* (or in future other address resolution) has completed on this
1635	* sk_buff. We now let ARP fill in the other fields.
1636	* I think this should return zero if packet is ready to send,
1637	* or non-zero if it needs more time to do an address lookup
1638	*/
1639
1640	static int strip_rebuild_header(struct sk_buff *skb)
1641	{
1642	#ifdef CONFIG_INET
1643	STRIP_Header header = (STRIP_Header ) skb->data;
1644
1645	/* Arp find returns zero if if knows the address, */
1646	/* or if it doesn't know the address it sends an ARP packet and returns non-zero */
1647	return arp_find(header->dst_addr.c, skb) ? 1 : 0;
1648	#else
1649	return 0;
1650	#endif
1651	}
1652
1653
1654	/************************************************************************/
1655	/* Receiving routines */
1656
1657	/*
1658	* This function parses the response to the ATS300? command,
1659	* extracting the radio version and serial number.
1660	*/
1661	static void get_radio_version(struct strip strip_info, __u8 ptr, __u8 * end)
1662	{
1663	__u8 p, value_begin, *value_end;
1664	int len;
1665
1666	/* Determine the beginning of the second line of the payload */
1667	p = ptr;
1668	while (p < end && *p != 10)
1669	p++;
1670	if (p >= end)
1671	return;
1672	p++;
1673	value_begin = p;
1674
1675	/* Determine the end of line */
1676	while (p < end && *p != 10)
1677	p++;
1678	if (p >= end)
1679	return;
1680	value_end = p;
1681	p++;
1682
1683	len = value_end - value_begin;
1684	len = min_t(int, len, sizeof(FirmwareVersion) - 1);
1685	if (strip_info->firmware_version.c[0] == 0)
1686	printk(KERN_INFO "%s: Radio Firmware: %.*s\n",
1687	strip_info->dev->name, len, value_begin);
1688	sprintf(strip_info->firmware_version.c, "%.*s", len, value_begin);
1689
1690	/* Look for the first colon */
1691	while (p < end && *p != ':')
1692	p++;
1693	if (p >= end)
1694	return;
1695	/* Skip over the space */
1696	p += 2;
1697	len = sizeof(SerialNumber) - 1;
1698	if (p + len <= end) {
1699	sprintf(strip_info->serial_number.c, "%.*s", len, p);
1700	} else {
1701	printk(KERN_DEBUG
1702	"STRIP: radio serial number shorter (%zd) than expected (%d)\n",
1703	end - p, len);
1704	}
1705	}
1706
1707	/*
1708	* This function parses the response to the ATS325? command,
1709	* extracting the radio battery voltage.
1710	*/
1711	static void get_radio_voltage(struct strip strip_info, __u8 ptr, __u8 * end)
1712	{
1713	int len;
1714
1715	len = sizeof(BatteryVoltage) - 1;
1716	if (ptr + len <= end) {
1717	sprintf(strip_info->battery_voltage.c, "%.*s", len, ptr);
1718	} else {
1719	printk(KERN_DEBUG
1720	"STRIP: radio voltage string shorter (%zd) than expected (%d)\n",
1721	end - ptr, len);
1722	}
1723	}
1724
1725	/*
1726	* This function parses the responses to the AT~LA and ATS311 commands,
1727	* which list the radio's neighbours.
1728	*/
1729	static void get_radio_neighbours(MetricomNodeTable * table, __u8 * ptr, __u8 * end)
1730	{
1731	table->num_nodes = 0;
1732	while (ptr < end && table->num_nodes < NODE_TABLE_SIZE) {
1733	MetricomNode *node = &table->node[table->num_nodes++];
1734	char dst = node->c, limit = dst + sizeof(*node) - 1;
1735	while (ptr < end && *ptr <= 32)
1736	ptr++;
1737	while (ptr < end && dst < limit && *ptr != 10)
1738	dst++ = ptr++;
1739	*dst++ = 0;
1740	while (ptr < end && ptr[-1] != 10)
1741	ptr++;
1742	}
1743	do_gettimeofday(&table->timestamp);
1744	}
1745
1746	static int get_radio_address(struct strip strip_info, __u8 p)
1747	{
1748	MetricomAddress addr;
1749
1750	if (string_to_radio_address(&addr, p))
1751	return (1);
1752
1753	/* See if our radio address has changed */
1754	if (memcmp(strip_info->true_dev_addr.c, addr.c, sizeof(addr))) {
1755	MetricomAddressString addr_string;
1756	radio_address_to_string(&addr, &addr_string);
1757	printk(KERN_INFO "%s: Radio address = %s\n",
1758	strip_info->dev->name, addr_string.c);
1759	strip_info->true_dev_addr = addr;
1760	if (!strip_info->manual_dev_addr)
1761	(MetricomAddress ) strip_info->dev->dev_addr =
1762	addr;
1763	/* Give the radio a few seconds to get its head straight, then send an arp */
1764	strip_info->gratuitous_arp = jiffies + 15 * HZ;
1765	strip_info->arp_interval = 1 * HZ;
1766	}
1767	return (0);
1768	}
1769
1770	static int verify_checksum(struct strip *strip_info)
1771	{
1772	__u8 *p = strip_info->sx_buff;
1773	__u8 *end = strip_info->sx_buff + strip_info->sx_count - 4;
1774	u_short sum =
1775	(READHEX16(end[0]) << 12) \| (READHEX16(end[1]) << 8) \|
1776	(READHEX16(end[2]) << 4) \| (READHEX16(end[3]));
1777	while (p < end)
1778	sum -= *p++;
1779	if (sum == 0 && strip_info->firmware_level == StructuredMessages) {
1780	strip_info->firmware_level = ChecksummedMessages;
1781	printk(KERN_INFO "%s: Radio provides message checksums\n",
1782	strip_info->dev->name);
1783	}
1784	return (sum == 0);
1785	}
1786
1787	static void RecvErr(char msg, struct strip strip_info)
1788	{
1789	__u8 *ptr = strip_info->sx_buff;
1790	__u8 *end = strip_info->sx_buff + strip_info->sx_count;
1791	DumpData(msg, strip_info, ptr, end);
1792	strip_info->rx_errors++;
1793	}
1794
1795	static void RecvErr_Message(struct strip strip_info, __u8 sendername,
1796	const __u8 * msg, u_long len)
1797	{
1798	if (has_prefix(msg, len, "001")) { /* Not in StarMode! */
1799	RecvErr("Error Msg:", strip_info);
1800	printk(KERN_INFO "%s: Radio %s is not in StarMode\n",
1801	strip_info->dev->name, sendername);
1802	}
1803
1804	else if (has_prefix(msg, len, "002")) { /* Remap handle */
1805	/* We ignore "Remap handle" messages for now */
1806	}
1807
1808	else if (has_prefix(msg, len, "003")) { /* Can't resolve name */
1809	RecvErr("Error Msg:", strip_info);
1810	printk(KERN_INFO "%s: Destination radio name is unknown\n",
1811	strip_info->dev->name);
1812	}
1813
1814	else if (has_prefix(msg, len, "004")) { /* Name too small or missing */
1815	strip_info->watchdog_doreset = jiffies + LongTime;
1816	#if TICKLE_TIMERS
1817	{
1818	struct timeval tv;
1819	do_gettimeofday(&tv);
1820	printk(KERN_INFO
1821	"**** Got ERR_004 response at %02d.%06d\n",
1822	tv.tv_sec % 100, tv.tv_usec);
1823	}
1824	#endif
1825	if (!strip_info->working) {
1826	strip_info->working = TRUE;
1827	printk(KERN_INFO "%s: Radio now in starmode\n",
1828	strip_info->dev->name);
1829	/*
1830	* If the radio has just entered a working state, we should do our first
1831	* probe ASAP, so that we find out our radio address etc. without delay.
1832	*/
1833	strip_info->watchdog_doprobe = jiffies;
1834	}
1835	if (strip_info->firmware_level == NoStructure && sendername) {
1836	strip_info->firmware_level = StructuredMessages;
1837	strip_info->next_command = 0; /* Try to enable checksums ASAP */
1838	printk(KERN_INFO
1839	"%s: Radio provides structured messages\n",
1840	strip_info->dev->name);
1841	}
1842	if (strip_info->firmware_level >= StructuredMessages) {
1843	/*
1844	* If this message has a valid checksum on the end, then the call to verify_checksum
1845	* will elevate the firmware_level to ChecksummedMessages for us. (The actual return
1846	* code from verify_checksum is ignored here.)
1847	*/
1848	verify_checksum(strip_info);
1849	/*
1850	* If the radio has structured messages but we don't yet have all our information about it,
1851	* we should do probes without delay, until we have gathered all the information
1852	*/
1853	if (!GOT_ALL_RADIO_INFO(strip_info))
1854	strip_info->watchdog_doprobe = jiffies;
1855	}
1856	}
1857
1858	else if (has_prefix(msg, len, "005")) /* Bad count specification */
1859	RecvErr("Error Msg:", strip_info);
1860
1861	else if (has_prefix(msg, len, "006")) /* Header too big */
1862	RecvErr("Error Msg:", strip_info);
1863
1864	else if (has_prefix(msg, len, "007")) { /* Body too big */
1865	RecvErr("Error Msg:", strip_info);
1866	printk(KERN_ERR
1867	"%s: Error! Packet size too big for radio.\n",
1868	strip_info->dev->name);
1869	}
1870
1871	else if (has_prefix(msg, len, "008")) { /* Bad character in name */
1872	RecvErr("Error Msg:", strip_info);
1873	printk(KERN_ERR
1874	"%s: Radio name contains illegal character\n",
1875	strip_info->dev->name);
1876	}
1877
1878	else if (has_prefix(msg, len, "009")) /* No count or line terminator */
1879	RecvErr("Error Msg:", strip_info);
1880
1881	else if (has_prefix(msg, len, "010")) /* Invalid checksum */
1882	RecvErr("Error Msg:", strip_info);
1883
1884	else if (has_prefix(msg, len, "011")) /* Checksum didn't match */
1885	RecvErr("Error Msg:", strip_info);
1886
1887	else if (has_prefix(msg, len, "012")) /* Failed to transmit packet */
1888	RecvErr("Error Msg:", strip_info);
1889
1890	else
1891	RecvErr("Error Msg:", strip_info);
1892	}
1893
1894	static void process_AT_response(struct strip strip_info, __u8 ptr,
1895	__u8 * end)
1896	{
1897	u_long len;
1898	__u8 *p = ptr;
1899	while (p < end && p[-1] != 10)
1900	p++; /* Skip past first newline character */
1901	/* Now ptr points to the AT command, and p points to the text of the response. */
1902	len = p - ptr;
1903
1904	#if TICKLE_TIMERS
1905	{
1906	struct timeval tv;
1907	do_gettimeofday(&tv);
1908	printk(KERN_INFO "**** Got AT response %.7s at %02d.%06d\n",
1909	ptr, tv.tv_sec % 100, tv.tv_usec);
1910	}
1911	#endif
1912
1913	if (has_prefix(ptr, len, "ATS300?"))
1914	get_radio_version(strip_info, p, end);
1915	else if (has_prefix(ptr, len, "ATS305?"))
1916	get_radio_address(strip_info, p);
1917	else if (has_prefix(ptr, len, "ATS311?"))
1918	get_radio_neighbours(&strip_info->poletops, p, end);
1919	else if (has_prefix(ptr, len, "ATS319=7"))
1920	verify_checksum(strip_info);
1921	else if (has_prefix(ptr, len, "ATS325?"))
1922	get_radio_voltage(strip_info, p, end);
1923	else if (has_prefix(ptr, len, "AT~LA"))
1924	get_radio_neighbours(&strip_info->portables, p, end);
1925	else
1926	RecvErr("Unknown AT Response:", strip_info);
1927	}
1928
1929	static void process_ACK(struct strip strip_info, __u8 ptr, __u8 * end)
1930	{
1931	/* Currently we don't do anything with ACKs from the radio */
1932	}
1933
1934	static void process_Info(struct strip strip_info, __u8 ptr, __u8 * end)
1935	{
1936	if (ptr + 16 > end)
1937	RecvErr("Bad Info Msg:", strip_info);
1938	}
1939
1940	static struct net_device get_strip_dev(struct strip strip_info)
1941	{
1942	/* If our hardware address is manually set to zero, and we know our */
1943	/* real radio hardware address, try to find another strip device that has been */
1944	/* manually set to that address that we can 'transfer ownership' of this packet to */
1945	if (strip_info->manual_dev_addr &&
1946	!memcmp(strip_info->dev->dev_addr, zero_address.c,
1947	sizeof(zero_address))
1948	&& memcmp(&strip_info->true_dev_addr, zero_address.c,
1949	sizeof(zero_address))) {
1950	struct net_device *dev;
1951	read_lock_bh(&dev_base_lock);
1952	for_each_netdev(&init_net, dev) {
1953	if (dev->type == strip_info->dev->type &&
1954	!memcmp(dev->dev_addr,
1955	&strip_info->true_dev_addr,
1956	sizeof(MetricomAddress))) {
1957	printk(KERN_INFO
1958	"%s: Transferred packet ownership to %s.\n",
1959	strip_info->dev->name, dev->name);
1960	read_unlock_bh(&dev_base_lock);
1961	return (dev);
1962	}
1963	}
1964	read_unlock_bh(&dev_base_lock);
1965	}
1966	return (strip_info->dev);
1967	}
1968
1969	/*
1970	* Send one completely decapsulated datagram to the next layer.
1971	*/
1972
1973	static void deliver_packet(struct strip strip_info, STRIP_Header header,
1974	__u16 packetlen)
1975	{
1976	struct sk_buff *skb = dev_alloc_skb(sizeof(STRIP_Header) + packetlen);
1977	if (!skb) {
1978	printk(KERN_ERR "%s: memory squeeze, dropping packet.\n",
1979	strip_info->dev->name);
1980	strip_info->rx_dropped++;
1981	} else {
1982	memcpy(skb_put(skb, sizeof(STRIP_Header)), header,
1983	sizeof(STRIP_Header));
1984	memcpy(skb_put(skb, packetlen), strip_info->rx_buff,
1985	packetlen);
1986	skb->dev = get_strip_dev(strip_info);
1987	skb->protocol = header->protocol;
1988	skb_reset_mac_header(skb);
1989
1990	/* Having put a fake header on the front of the sk_buff for the */
1991	/* benefit of tools like tcpdump, skb_pull now 'consumes' that */
1992	/* fake header before we hand the packet up to the next layer. */
1993	skb_pull(skb, sizeof(STRIP_Header));
1994
1995	/* Finally, hand the packet up to the next layer (e.g. IP or ARP, etc.) */
1996	strip_info->rx_packets++;
1997	strip_info->rx_pps_count++;
1998	#ifdef EXT_COUNTERS
1999	strip_info->rx_bytes += packetlen;
2000	#endif
2001	netif_rx(skb);
2002	}
2003	}
2004
2005	static void process_IP_packet(struct strip *strip_info,
2006	STRIP_Header * header, __u8 * ptr,
2007	__u8 * end)
2008	{
2009	__u16 packetlen;
2010
2011	/* Decode start of the IP packet header */
2012	ptr = UnStuffData(ptr, end, strip_info->rx_buff, 4);
2013	if (!ptr) {
2014	RecvErr("IP Packet too short", strip_info);
2015	return;
2016	}
2017
2018	packetlen = ((__u16) strip_info->rx_buff[2] << 8) \| strip_info->rx_buff[3];
2019
2020	if (packetlen > MAX_RECV_MTU) {
2021	printk(KERN_INFO "%s: Dropping oversized received IP packet: %d bytes\n",
2022	strip_info->dev->name, packetlen);
2023	strip_info->rx_dropped++;
2024	return;
2025	}
2026
2027	/printk(KERN_INFO "%s: Got %d byte IP packet\n", strip_info->dev->name, packetlen); /
2028
2029	/* Decode remainder of the IP packet */
2030	ptr =
2031	UnStuffData(ptr, end, strip_info->rx_buff + 4, packetlen - 4);
2032	if (!ptr) {
2033	RecvErr("IP Packet too short", strip_info);
2034	return;
2035	}
2036
2037	if (ptr < end) {
2038	RecvErr("IP Packet too long", strip_info);
2039	return;
2040	}
2041
2042	header->protocol = htons(ETH_P_IP);
2043
2044	deliver_packet(strip_info, header, packetlen);
2045	}
2046
2047	static void process_ARP_packet(struct strip *strip_info,
2048	STRIP_Header * header, __u8 * ptr,
2049	__u8 * end)
2050	{
2051	__u16 packetlen;
2052	struct arphdr arphdr = (struct arphdr ) strip_info->rx_buff;
2053
2054	/* Decode start of the ARP packet */
2055	ptr = UnStuffData(ptr, end, strip_info->rx_buff, 8);
2056	if (!ptr) {
2057	RecvErr("ARP Packet too short", strip_info);
2058	return;
2059	}
2060
2061	packetlen = 8 + (arphdr->ar_hln + arphdr->ar_pln) * 2;
2062
2063	if (packetlen > MAX_RECV_MTU) {
2064	printk(KERN_INFO
2065	"%s: Dropping oversized received ARP packet: %d bytes\n",
2066	strip_info->dev->name, packetlen);
2067	strip_info->rx_dropped++;
2068	return;
2069	}
2070
2071	/*printk(KERN_INFO "%s: Got %d byte ARP %s\n",
2072	strip_info->dev->name, packetlen,
2073	ntohs(arphdr->ar_op) == ARPOP_REQUEST ? "request" : "reply"); */
2074
2075	/* Decode remainder of the ARP packet */
2076	ptr =
2077	UnStuffData(ptr, end, strip_info->rx_buff + 8, packetlen - 8);
2078	if (!ptr) {
2079	RecvErr("ARP Packet too short", strip_info);
2080	return;
2081	}
2082
2083	if (ptr < end) {
2084	RecvErr("ARP Packet too long", strip_info);
2085	return;
2086	}
2087
2088	header->protocol = htons(ETH_P_ARP);
2089
2090	deliver_packet(strip_info, header, packetlen);
2091	}
2092
2093	/*
2094	* process_text_message processes a <CR>-terminated block of data received
2095	* from the radio that doesn't begin with a '*' character. All normal
2096	* Starmode communication messages with the radio begin with a '*',
2097	* so any text that does not indicates a serial port error, a radio that
2098	* is in Hayes command mode instead of Starmode, or a radio with really
2099	* old firmware that doesn't frame its Starmode responses properly.
2100	*/
2101	static void process_text_message(struct strip *strip_info)
2102	{
2103	__u8 *msg = strip_info->sx_buff;
2104	int len = strip_info->sx_count;
2105
2106	/* Check for anything that looks like it might be our radio name */
2107	/* (This is here for backwards compatibility with old firmware) */
2108	if (len == 9 && get_radio_address(strip_info, msg) == 0)
2109	return;
2110
2111	if (text_equal(msg, len, "OK"))
2112	return; /* Ignore 'OK' responses from prior commands */
2113	if (text_equal(msg, len, "ERROR"))
2114	return; /* Ignore 'ERROR' messages */
2115	if (has_prefix(msg, len, "ate0q1"))
2116	return; /* Ignore character echo back from the radio */
2117
2118	/* Catch other error messages */
2119	/* (This is here for backwards compatibility with old firmware) */
2120	if (has_prefix(msg, len, "ERR_")) {
2121	RecvErr_Message(strip_info, NULL, &msg[4], len - 4);
2122	return;
2123	}
2124
2125	RecvErr("No initial *", strip_info);
2126	}
2127
2128	/*
2129	* process_message processes a <CR>-terminated block of data received
2130	* from the radio. If the radio is not in Starmode or has old firmware,
2131	* it may be a line of text in response to an AT command. Ideally, with
2132	* a current radio that's properly in Starmode, all data received should
2133	* be properly framed and checksummed radio message blocks, containing
2134	* either a starmode packet, or a other communication from the radio
2135	* firmware, like "INF_" Info messages and &COMMAND responses.
2136	*/
2137	static void process_message(struct strip *strip_info)
2138	{
2139	STRIP_Header header = { zero_address, zero_address, 0 };
2140	__u8 *ptr = strip_info->sx_buff;
2141	__u8 *end = strip_info->sx_buff + strip_info->sx_count;
2142	__u8 sendername[32], *sptr = sendername;
2143	MetricomKey key;
2144
2145	/HexDump("Receiving", strip_info, ptr, end); /
2146
2147	/* Check for start of address marker, and then skip over it */
2148	if (ptr == '')
2149	ptr++;
2150	else {
2151	process_text_message(strip_info);
2152	return;
2153	}
2154
2155	/* Copy out the return address */
2156	while (ptr < end && ptr != ''
2157	&& sptr < ARRAY_END(sendername) - 1)
2158	sptr++ = ptr++;
2159	sptr = 0; / Null terminate the sender name */
2160
2161	/* Check for end of address marker, and skip over it */
2162	if (ptr >= end \|\| ptr != '') {
2163	RecvErr("No second *", strip_info);
2164	return;
2165	}
2166	ptr++; /* Skip the second '' /
2167
2168	/* If the sender name is "&COMMAND", ignore this 'packet' */
2169	/* (This is here for backwards compatibility with old firmware) */
2170	if (!strcmp(sendername, "&COMMAND")) {
2171	strip_info->firmware_level = NoStructure;
2172	strip_info->next_command = CompatibilityCommand;
2173	return;
2174	}
2175
2176	if (ptr + 4 > end) {
2177	RecvErr("No proto key", strip_info);
2178	return;
2179	}
2180
2181	/* Get the protocol key out of the buffer */
2182	key.c[0] = *ptr++;
2183	key.c[1] = *ptr++;
2184	key.c[2] = *ptr++;
2185	key.c[3] = *ptr++;
2186
2187	/* If we're using checksums, verify the checksum at the end of the packet */
2188	if (strip_info->firmware_level >= ChecksummedMessages) {
2189	end -= 4; /* Chop the last four bytes off the packet (they're the checksum) */
2190	if (ptr > end) {
2191	RecvErr("Missing Checksum", strip_info);
2192	return;
2193	}
2194	if (!verify_checksum(strip_info)) {
2195	RecvErr("Bad Checksum", strip_info);
2196	return;
2197	}
2198	}
2199
2200	/printk(KERN_INFO "%s: Got packet from \"%s\".\n", strip_info->dev->name, sendername); /
2201
2202	/*
2203	* Fill in (pseudo) source and destination addresses in the packet.
2204	* We assume that the destination address was our address (the radio does not
2205	* tell us this). If the radio supplies a source address, then we use it.
2206	*/
2207	header.dst_addr = strip_info->true_dev_addr;
2208	string_to_radio_address(&header.src_addr, sendername);
2209
2210	#ifdef EXT_COUNTERS
2211	if (key.l == SIP0Key.l) {
2212	strip_info->rx_rbytes += (end - ptr);
2213	process_IP_packet(strip_info, &header, ptr, end);
2214	} else if (key.l == ARP0Key.l) {
2215	strip_info->rx_rbytes += (end - ptr);
2216	process_ARP_packet(strip_info, &header, ptr, end);
2217	} else if (key.l == ATR_Key.l) {
2218	strip_info->rx_ebytes += (end - ptr);
2219	process_AT_response(strip_info, ptr, end);
2220	} else if (key.l == ACK_Key.l) {
2221	strip_info->rx_ebytes += (end - ptr);
2222	process_ACK(strip_info, ptr, end);
2223	} else if (key.l == INF_Key.l) {
2224	strip_info->rx_ebytes += (end - ptr);
2225	process_Info(strip_info, ptr, end);
2226	} else if (key.l == ERR_Key.l) {
2227	strip_info->rx_ebytes += (end - ptr);
2228	RecvErr_Message(strip_info, sendername, ptr, end - ptr);
2229	} else
2230	RecvErr("Unrecognized protocol key", strip_info);
2231	#else
2232	if (key.l == SIP0Key.l)
2233	process_IP_packet(strip_info, &header, ptr, end);
2234	else if (key.l == ARP0Key.l)
2235	process_ARP_packet(strip_info, &header, ptr, end);
2236	else if (key.l == ATR_Key.l)
2237	process_AT_response(strip_info, ptr, end);
2238	else if (key.l == ACK_Key.l)
2239	process_ACK(strip_info, ptr, end);
2240	else if (key.l == INF_Key.l)
2241	process_Info(strip_info, ptr, end);
2242	else if (key.l == ERR_Key.l)
2243	RecvErr_Message(strip_info, sendername, ptr, end - ptr);
2244	else
2245	RecvErr("Unrecognized protocol key", strip_info);
2246	#endif
2247	}
2248
2249	#define TTYERROR(X) ((X) == TTY_BREAK ? "Break" : \
2250	(X) == TTY_FRAME ? "Framing Error" : \
2251	(X) == TTY_PARITY ? "Parity Error" : \
2252	(X) == TTY_OVERRUN ? "Hardware Overrun" : "Unknown Error")
2253
2254	/*
2255	* Handle the 'receiver data ready' interrupt.
2256	* This function is called by the 'tty_io' module in the kernel when
2257	* a block of STRIP data has been received, which can now be decapsulated
2258	* and sent on to some IP layer for further processing.
2259	*/
2260
2261	static void strip_receive_buf(struct tty_struct tty, const unsigned char cp,
2262	char *fp, int count)
2263	{
2264	struct strip *strip_info = tty->disc_data;
2265	const unsigned char *end = cp + count;
2266
2267	if (!strip_info \|\| strip_info->magic != STRIP_MAGIC
2268	\|\| !netif_running(strip_info->dev))
2269	return;
2270
2271	spin_lock_bh(&strip_lock);
2272	#if 0
2273	{
2274	struct timeval tv;
2275	do_gettimeofday(&tv);
2276	printk(KERN_INFO
2277	"**** strip_receive_buf: %3d bytes at %02d.%06d\n",
2278	count, tv.tv_sec % 100, tv.tv_usec);
2279	}
2280	#endif
2281
2282	#ifdef EXT_COUNTERS
2283	strip_info->rx_sbytes += count;
2284	#endif
2285
2286	/* Read the characters out of the buffer */
2287	while (cp < end) {
2288	if (fp && *fp)
2289	printk(KERN_INFO "%s: %s on serial port\n",
2290	strip_info->dev->name, TTYERROR(*fp));
2291	if (fp && fp++ && !strip_info->discard) { / If there's a serial error, record it */
2292	/* If we have some characters in the buffer, discard them */
2293	strip_info->discard = strip_info->sx_count;
2294	strip_info->rx_errors++;
2295	}
2296
2297	/* Leading control characters (CR, NL, Tab, etc.) are ignored */
2298	if (strip_info->sx_count > 0 \|\| *cp >= ' ') {
2299	if (cp == 0x0D) { / If end of packet, decide what to do with it */
2300	if (strip_info->sx_count > 3000)
2301	printk(KERN_INFO
2302	"%s: Cut a %d byte packet (%zd bytes remaining)%s\n",
2303	strip_info->dev->name,
2304	strip_info->sx_count,
2305	end - cp - 1,
2306	strip_info->
2307	discard ? " (discarded)" :
2308	"");
2309	if (strip_info->sx_count >
2310	strip_info->sx_size) {
2311	strip_info->rx_over_errors++;
2312	printk(KERN_INFO
2313	"%s: sx_buff overflow (%d bytes total)\n",
2314	strip_info->dev->name,
2315	strip_info->sx_count);
2316	} else if (strip_info->discard)
2317	printk(KERN_INFO
2318	"%s: Discarding bad packet (%d/%d)\n",
2319	strip_info->dev->name,
2320	strip_info->discard,
2321	strip_info->sx_count);
2322	else
2323	process_message(strip_info);
2324	strip_info->discard = 0;
2325	strip_info->sx_count = 0;
2326	} else {
2327	/* Make sure we have space in the buffer */
2328	if (strip_info->sx_count <
2329	strip_info->sx_size)
2330	strip_info->sx_buff[strip_info->
2331	sx_count] =
2332	*cp;
2333	strip_info->sx_count++;
2334	}
2335	}
2336	cp++;
2337	}
2338	spin_unlock_bh(&strip_lock);
2339	}
2340
2341
2342	/************************************************************************/
2343	/* General control routines */
2344
2345	static int set_mac_address(struct strip *strip_info,
2346	MetricomAddress * addr)
2347	{
2348	/*
2349	* We're using a manually specified address if the address is set
2350	* to anything other than all ones. Setting the address to all ones
2351	* disables manual mode and goes back to automatic address determination
2352	* (tracking the true address that the radio has).
2353	*/
2354	strip_info->manual_dev_addr =
2355	memcmp(addr->c, broadcast_address.c,
2356	sizeof(broadcast_address));
2357	if (strip_info->manual_dev_addr)
2358	(MetricomAddress ) strip_info->dev->dev_addr = *addr;
2359	else
2360	(MetricomAddress ) strip_info->dev->dev_addr =
2361	strip_info->true_dev_addr;
2362	return 0;
2363	}
2364
2365	static int strip_set_mac_address(struct net_device dev, void addr)
2366	{
2367	struct strip *strip_info = netdev_priv(dev);
2368	struct sockaddr *sa = addr;
2369	printk(KERN_INFO "%s: strip_set_dev_mac_address called\n", dev->name);
2370	set_mac_address(strip_info, (MetricomAddress *) sa->sa_data);
2371	return 0;
2372	}
2373
2374	static struct net_device_stats strip_get_stats(struct net_device dev)
2375	{
2376	struct strip *strip_info = netdev_priv(dev);
2377	static struct net_device_stats stats;
2378
2379	memset(&stats, 0, sizeof(struct net_device_stats));
2380
2381	stats.rx_packets = strip_info->rx_packets;
2382	stats.tx_packets = strip_info->tx_packets;
2383	stats.rx_dropped = strip_info->rx_dropped;
2384	stats.tx_dropped = strip_info->tx_dropped;
2385	stats.tx_errors = strip_info->tx_errors;
2386	stats.rx_errors = strip_info->rx_errors;
2387	stats.rx_over_errors = strip_info->rx_over_errors;
2388	return (&stats);
2389	}
2390
2391
2392	/************************************************************************/
2393	/* Opening and closing */
2394
2395	/*
2396	* Here's the order things happen:
2397	* When the user runs "slattach -p strip ..."
2398	* 1. The TTY module calls strip_open;;
2399	* 2. strip_open calls strip_alloc
2400	* 3. strip_alloc calls register_netdev
2401	* 4. register_netdev calls strip_dev_init
2402	* 5. then strip_open finishes setting up the strip_info
2403	*
2404	* When the user runs "ifconfig st<x> up address netmask ..."
2405	* 6. strip_open_low gets called
2406	*
2407	* When the user runs "ifconfig st<x> down"
2408	* 7. strip_close_low gets called
2409	*
2410	* When the user kills the slattach process
2411	* 8. strip_close gets called
2412	* 9. strip_close calls dev_close
2413	* 10. if the device is still up, then dev_close calls strip_close_low
2414	* 11. strip_close calls strip_free
2415	*/
2416
2417	/* Open the low-level part of the STRIP channel. Easy! */
2418
2419	static int strip_open_low(struct net_device *dev)
2420	{
2421	struct strip *strip_info = netdev_priv(dev);
2422
2423	if (strip_info->tty == NULL)
2424	return (-ENODEV);
2425
2426	if (!allocate_buffers(strip_info, dev->mtu))
2427	return (-ENOMEM);
2428
2429	strip_info->sx_count = 0;
2430	strip_info->tx_left = 0;
2431
2432	strip_info->discard = 0;
2433	strip_info->working = FALSE;
2434	strip_info->firmware_level = NoStructure;
2435	strip_info->next_command = CompatibilityCommand;
2436	strip_info->user_baud = tty_get_baud_rate(strip_info->tty);
2437
2438	printk(KERN_INFO "%s: Initializing Radio.\n",
2439	strip_info->dev->name);
2440	ResetRadio(strip_info);
2441	strip_info->idle_timer.expires = jiffies + 1 * HZ;
2442	add_timer(&strip_info->idle_timer);
2443	netif_wake_queue(dev);
2444	return (0);
2445	}
2446
2447
2448	/*
2449	* Close the low-level part of the STRIP channel. Easy!
2450	*/
2451
2452	static int strip_close_low(struct net_device *dev)
2453	{
2454	struct strip *strip_info = netdev_priv(dev);
2455
2456	if (strip_info->tty == NULL)
2457	return -EBUSY;
2458	clear_bit(TTY_DO_WRITE_WAKEUP, &strip_info->tty->flags);
2459	netif_stop_queue(dev);
2460
2461	/*
2462	* Free all STRIP frame buffers.
2463	*/
2464	kfree(strip_info->rx_buff);
2465	strip_info->rx_buff = NULL;
2466	kfree(strip_info->sx_buff);
2467	strip_info->sx_buff = NULL;
2468	kfree(strip_info->tx_buff);
2469	strip_info->tx_buff = NULL;
2470
2471	del_timer(&strip_info->idle_timer);
2472	return 0;
2473	}
2474
2475	static const struct header_ops strip_header_ops = {
2476	.create = strip_header,
2477	.rebuild = strip_rebuild_header,
2478	};
2479
2480
2481	static const struct net_device_ops strip_netdev_ops = {
2482	.ndo_open = strip_open_low,
2483	.ndo_stop = strip_close_low,
2484	.ndo_start_xmit = strip_xmit,
2485	.ndo_set_mac_address = strip_set_mac_address,
2486	.ndo_get_stats = strip_get_stats,
2487	.ndo_change_mtu = strip_change_mtu,
2488	};
2489
2490	/*
2491	* This routine is called by DDI when the
2492	* (dynamically assigned) device is registered
2493	*/
2494
2495	static void strip_dev_setup(struct net_device *dev)
2496	{
2497	/*
2498	* Finish setting up the DEVICE info.
2499	*/
2500
2501	dev->trans_start = 0;
2502	dev->tx_queue_len = 30; /* Drop after 30 frames queued */
2503
2504	dev->flags = 0;
2505	dev->mtu = DEFAULT_STRIP_MTU;
2506	dev->type = ARPHRD_METRICOM; /* dtang */
2507	dev->hard_header_len = sizeof(STRIP_Header);
2508	/*
2509	* netdev_priv(dev) Already holds a pointer to our struct strip
2510	*/
2511
2512	(MetricomAddress )dev->broadcast = broadcast_address;
2513	dev->dev_addr[0] = 0;
2514	dev->addr_len = sizeof(MetricomAddress);
2515
2516	dev->header_ops = &strip_header_ops,
2517	dev->netdev_ops = &strip_netdev_ops;
2518	}
2519
2520	/*
2521	* Free a STRIP channel.
2522	*/
2523
2524	static void strip_free(struct strip *strip_info)
2525	{
2526	spin_lock_bh(&strip_lock);
2527	list_del_rcu(&strip_info->list);
2528	spin_unlock_bh(&strip_lock);
2529
2530	strip_info->magic = 0;
2531
2532	free_netdev(strip_info->dev);
2533	}
2534
2535
2536	/*
2537	* Allocate a new free STRIP channel
2538	*/
2539	static struct strip *strip_alloc(void)
2540	{
2541	struct list_head *n;
2542	struct net_device *dev;
2543	struct strip *strip_info;
2544
2545	dev = alloc_netdev(sizeof(struct strip), "st%d",
2546	strip_dev_setup);
2547
2548	if (!dev)
2549	return NULL; /* If no more memory, return */
2550
2551
2552	strip_info = netdev_priv(dev);
2553	strip_info->dev = dev;
2554
2555	strip_info->magic = STRIP_MAGIC;
2556	strip_info->tty = NULL;
2557
2558	strip_info->gratuitous_arp = jiffies + LongTime;
2559	strip_info->arp_interval = 0;
2560	init_timer(&strip_info->idle_timer);
2561	strip_info->idle_timer.data = (long) dev;
2562	strip_info->idle_timer.function = strip_IdleTask;
2563
2564
2565	spin_lock_bh(&strip_lock);
2566	rescan:
2567	/*
2568	* Search the list to find where to put our new entry
2569	* (and in the process decide what channel number it is
2570	* going to be)
2571	*/
2572	list_for_each(n, &strip_list) {
2573	struct strip *s = hlist_entry(n, struct strip, list);
2574
2575	if (s->dev->base_addr == dev->base_addr) {
2576	++dev->base_addr;
2577	goto rescan;
2578	}
2579	}
2580
2581	sprintf(dev->name, "st%ld", dev->base_addr);
2582
2583	list_add_tail_rcu(&strip_info->list, &strip_list);
2584	spin_unlock_bh(&strip_lock);
2585
2586	return strip_info;
2587	}
2588
2589	/*
2590	* Open the high-level part of the STRIP channel.
2591	* This function is called by the TTY module when the
2592	* STRIP line discipline is called for. Because we are
2593	* sure the tty line exists, we only have to link it to
2594	* a free STRIP channel...
2595	*/
2596
2597	static int strip_open(struct tty_struct *tty)
2598	{
2599	struct strip *strip_info = tty->disc_data;
2600
2601	/*
2602	* First make sure we're not already connected.
2603	*/
2604
2605	if (strip_info && strip_info->magic == STRIP_MAGIC)
2606	return -EEXIST;
2607
2608	/*
2609	* We need a write method.
2610	*/
2611
2612	if (tty->ops->write == NULL \|\| tty->ops->set_termios == NULL)
2613	return -EOPNOTSUPP;
2614
2615	/*
2616	* OK. Find a free STRIP channel to use.
2617	*/
2618	if ((strip_info = strip_alloc()) == NULL)
2619	return -ENFILE;
2620
2621	/*
2622	* Register our newly created device so it can be ifconfig'd
2623	* strip_dev_init() will be called as a side-effect
2624	*/
2625
2626	if (register_netdev(strip_info->dev) != 0) {
2627	printk(KERN_ERR "strip: register_netdev() failed.\n");
2628	strip_free(strip_info);
2629	return -ENFILE;
2630	}
2631
2632	strip_info->tty = tty;
2633	tty->disc_data = strip_info;
2634	tty->receive_room = 65536;
2635
2636	tty_driver_flush_buffer(tty);
2637
2638	/*
2639	* Restore default settings
2640	*/
2641
2642	strip_info->dev->type = ARPHRD_METRICOM; /* dtang */
2643
2644	/*
2645	* Set tty options
2646	*/
2647
2648	tty->termios->c_iflag \|= IGNBRK \| IGNPAR; /* Ignore breaks and parity errors. */
2649	tty->termios->c_cflag \|= CLOCAL; /* Ignore modem control signals. */
2650	tty->termios->c_cflag &= ~HUPCL; /* Don't close on hup */
2651
2652	printk(KERN_INFO "STRIP: device \"%s\" activated\n",
2653	strip_info->dev->name);
2654
2655	/*
2656	* Done. We have linked the TTY line to a channel.
2657	*/
2658	return (strip_info->dev->base_addr);
2659	}
2660
2661	/*
2662	* Close down a STRIP channel.
2663	* This means flushing out any pending queues, and then restoring the
2664	* TTY line discipline to what it was before it got hooked to STRIP
2665	* (which usually is TTY again).
2666	*/
2667
2668	static void strip_close(struct tty_struct *tty)
2669	{
2670	struct strip *strip_info = tty->disc_data;
2671
2672	/*
2673	* First make sure we're connected.
2674	*/
2675
2676	if (!strip_info \|\| strip_info->magic != STRIP_MAGIC)
2677	return;
2678
2679	unregister_netdev(strip_info->dev);
2680
2681	tty->disc_data = NULL;
2682	strip_info->tty = NULL;
2683	printk(KERN_INFO "STRIP: device \"%s\" closed down\n",
2684	strip_info->dev->name);
2685	strip_free(strip_info);
2686	tty->disc_data = NULL;
2687	}
2688
2689
2690	/************************************************************************/
2691	/* Perform I/O control calls on an active STRIP channel. */
2692
2693	static int strip_ioctl(struct tty_struct tty, struct file file,
2694	unsigned int cmd, unsigned long arg)
2695	{
2696	struct strip *strip_info = tty->disc_data;
2697
2698	/*
2699	* First make sure we're connected.
2700	*/
2701
2702	if (!strip_info \|\| strip_info->magic != STRIP_MAGIC)
2703	return -EINVAL;
2704
2705	switch (cmd) {
2706	case SIOCGIFNAME:
2707	if(copy_to_user((void __user *) arg, strip_info->dev->name, strlen(strip_info->dev->name) + 1))
2708	return -EFAULT;
2709	break;
2710	case SIOCSIFHWADDR:
2711	{
2712	MetricomAddress addr;
2713	//printk(KERN_INFO "%s: SIOCSIFHWADDR\n", strip_info->dev->name);
2714	if(copy_from_user(&addr, (void __user *) arg, sizeof(MetricomAddress)))
2715	return -EFAULT;
2716	return set_mac_address(strip_info, &addr);
2717	}
2718	default:
2719	return tty_mode_ioctl(tty, file, cmd, arg);
2720	break;
2721	}
2722	return 0;
2723	}
2724
2725
2726	/************************************************************************/
2727	/* Initialization */
2728
2729	static struct tty_ldisc_ops strip_ldisc = {
2730	.magic = TTY_LDISC_MAGIC,
2731	.name = "strip",
2732	.owner = THIS_MODULE,
2733	.open = strip_open,
2734	.close = strip_close,
2735	.ioctl = strip_ioctl,
2736	.receive_buf = strip_receive_buf,
2737	.write_wakeup = strip_write_some_more,
2738	};
2739
2740	/*
2741	* Initialize the STRIP driver.
2742	* This routine is called at boot time, to bootstrap the multi-channel
2743	* STRIP driver
2744	*/
2745
2746	static char signon[] __initdata =
2747	KERN_INFO "STRIP: Version %s (unlimited channels)\n";
2748
2749	static int __init strip_init_driver(void)
2750	{
2751	int status;
2752
2753	printk(signon, StripVersion);
2754
2755
2756	/*
2757	* Fill in our line protocol discipline, and register it
2758	*/
2759	if ((status = tty_register_ldisc(N_STRIP, &strip_ldisc)))
2760	printk(KERN_ERR "STRIP: can't register line discipline (err = %d)\n",
2761	status);
2762
2763	/*
2764	* Register the status file with /proc
2765	*/
2766	proc_net_fops_create(&init_net, "strip", S_IFREG \| S_IRUGO, &strip_seq_fops);
2767
2768	return status;
2769	}
2770
2771	module_init(strip_init_driver);
2772
2773	static const char signoff[] __exitdata =
2774	KERN_INFO "STRIP: Module Unloaded\n";
2775
2776	static void __exit strip_exit_driver(void)
2777	{
2778	int i;
2779	struct list_head p,n;
2780
2781	/* module ref count rules assure that all entries are unregistered */
2782	list_for_each_safe(p, n, &strip_list) {
2783	struct strip *s = list_entry(p, struct strip, list);
2784	strip_free(s);
2785	}
2786
2787	/* Unregister with the /proc/net file here. */
2788	proc_net_remove(&init_net, "strip");
2789
2790	if ((i = tty_unregister_ldisc(N_STRIP)))
2791	printk(KERN_ERR "STRIP: can't unregister line discipline (err = %d)\n", i);
2792
2793	printk(signoff);
2794	}
2795
2796	module_exit(strip_exit_driver);
2797
2798	MODULE_AUTHOR("Stuart Cheshire <cheshire@cs.stanford.edu>");
2799	MODULE_DESCRIPTION("Starmode Radio IP (STRIP) Device Driver");
2800	MODULE_LICENSE("Dual BSD/GPL");
2801
2802	MODULE_SUPPORTED_DEVICE("Starmode Radio IP (STRIP) modem");
2803

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