strip.c 84 KB

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