Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1996 The Board of Trustees of The Leland Stanford |
| 3 | * Junior University. All Rights Reserved. |
| 4 | * |
| 5 | * Permission to use, copy, modify, and distribute this |
| 6 | * software and its documentation for any purpose and without |
| 7 | * fee is hereby granted, provided that the above copyright |
| 8 | * notice appear in all copies. Stanford University |
| 9 | * makes no representations about the suitability of this |
| 10 | * software for any purpose. It is provided "as is" without |
| 11 | * express or implied warranty. |
| 12 | * |
| 13 | * strip.c This module implements Starmode Radio IP (STRIP) |
| 14 | * for kernel-based devices like TTY. It interfaces between a |
| 15 | * raw TTY, and the kernel's INET protocol layers (via DDI). |
| 16 | * |
| 17 | * Version: @(#)strip.c 1.3 July 1997 |
| 18 | * |
| 19 | * Author: Stuart Cheshire <cheshire@cs.stanford.edu> |
| 20 | * |
| 21 | * Fixes: v0.9 12th Feb 1996 (SC) |
| 22 | * New byte stuffing (2+6 run-length encoding) |
| 23 | * New watchdog timer task |
| 24 | * New Protocol key (SIP0) |
| 25 | * |
| 26 | * v0.9.1 3rd March 1996 (SC) |
| 27 | * Changed to dynamic device allocation -- no more compile |
| 28 | * time (or boot time) limit on the number of STRIP devices. |
| 29 | * |
| 30 | * v0.9.2 13th March 1996 (SC) |
| 31 | * Uses arp cache lookups (but doesn't send arp packets yet) |
| 32 | * |
| 33 | * v0.9.3 17th April 1996 (SC) |
| 34 | * Fixed bug where STR_ERROR flag was getting set unneccessarily |
| 35 | * (causing otherwise good packets to be unneccessarily dropped) |
| 36 | * |
| 37 | * v0.9.4 27th April 1996 (SC) |
| 38 | * First attempt at using "&COMMAND" Starmode AT commands |
| 39 | * |
| 40 | * v0.9.5 29th May 1996 (SC) |
| 41 | * First attempt at sending (unicast) ARP packets |
| 42 | * |
| 43 | * v0.9.6 5th June 1996 (Elliot) |
| 44 | * Put "message level" tags in every "printk" statement |
| 45 | * |
| 46 | * v0.9.7 13th June 1996 (laik) |
| 47 | * Added support for the /proc fs |
| 48 | * |
| 49 | * v0.9.8 July 1996 (Mema) |
| 50 | * Added packet logging |
| 51 | * |
| 52 | * v1.0 November 1996 (SC) |
| 53 | * Fixed (severe) memory leaks in the /proc fs code |
| 54 | * Fixed race conditions in the logging code |
| 55 | * |
| 56 | * v1.1 January 1997 (SC) |
| 57 | * Deleted packet logging (use tcpdump instead) |
| 58 | * Added support for Metricom Firmware v204 features |
| 59 | * (like message checksums) |
| 60 | * |
| 61 | * v1.2 January 1997 (SC) |
| 62 | * Put portables list back in |
| 63 | * |
| 64 | * v1.3 July 1997 (SC) |
| 65 | * Made STRIP driver set the radio's baud rate automatically. |
| 66 | * It is no longer necessarily to manually set the radio's |
| 67 | * rate permanently to 115200 -- the driver handles setting |
| 68 | * the rate automatically. |
| 69 | */ |
| 70 | |
| 71 | #ifdef MODULE |
| 72 | static const char StripVersion[] = "1.3A-STUART.CHESHIRE-MODULAR"; |
| 73 | #else |
| 74 | static const char StripVersion[] = "1.3A-STUART.CHESHIRE"; |
| 75 | #endif |
| 76 | |
| 77 | #define TICKLE_TIMERS 0 |
| 78 | #define EXT_COUNTERS 1 |
| 79 | |
| 80 | |
| 81 | /************************************************************************/ |
| 82 | /* Header files */ |
| 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <linux/kernel.h> |
| 85 | #include <linux/module.h> |
| 86 | #include <linux/init.h> |
| 87 | #include <linux/bitops.h> |
| 88 | #include <asm/system.h> |
| 89 | #include <asm/uaccess.h> |
| 90 | |
| 91 | # include <linux/ctype.h> |
| 92 | #include <linux/string.h> |
| 93 | #include <linux/mm.h> |
| 94 | #include <linux/interrupt.h> |
| 95 | #include <linux/in.h> |
| 96 | #include <linux/tty.h> |
| 97 | #include <linux/errno.h> |
| 98 | #include <linux/netdevice.h> |
| 99 | #include <linux/inetdevice.h> |
| 100 | #include <linux/etherdevice.h> |
| 101 | #include <linux/skbuff.h> |
| 102 | #include <linux/if_arp.h> |
| 103 | #include <linux/if_strip.h> |
| 104 | #include <linux/proc_fs.h> |
| 105 | #include <linux/seq_file.h> |
| 106 | #include <linux/serial.h> |
| 107 | #include <linux/serialP.h> |
| 108 | #include <linux/rcupdate.h> |
| 109 | #include <net/arp.h> |
| 110 | |
| 111 | #include <linux/ip.h> |
| 112 | #include <linux/tcp.h> |
| 113 | #include <linux/time.h> |
Marcelo Feitoza Parisi | ff5688a | 2006-01-09 18:37:15 -0800 | [diff] [blame] | 114 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | /************************************************************************/ |
| 117 | /* Useful structures and definitions */ |
| 118 | |
| 119 | /* |
| 120 | * A MetricomKey identifies the protocol being carried inside a Metricom |
| 121 | * Starmode packet. |
| 122 | */ |
| 123 | |
| 124 | typedef union { |
| 125 | __u8 c[4]; |
| 126 | __u32 l; |
| 127 | } MetricomKey; |
| 128 | |
| 129 | /* |
| 130 | * An IP address can be viewed as four bytes in memory (which is what it is) or as |
| 131 | * a single 32-bit long (which is convenient for assignment, equality testing etc.) |
| 132 | */ |
| 133 | |
| 134 | typedef union { |
| 135 | __u8 b[4]; |
| 136 | __u32 l; |
| 137 | } IPaddr; |
| 138 | |
| 139 | /* |
| 140 | * A MetricomAddressString is used to hold a printable representation of |
| 141 | * a Metricom address. |
| 142 | */ |
| 143 | |
| 144 | typedef struct { |
| 145 | __u8 c[24]; |
| 146 | } MetricomAddressString; |
| 147 | |
| 148 | /* Encapsulation can expand packet of size x to 65/64x + 1 |
| 149 | * Sent packet looks like "<CR>*<address>*<key><encaps payload><CR>" |
| 150 | * 1 1 1-18 1 4 ? 1 |
| 151 | * eg. <CR>*0000-1234*SIP0<encaps payload><CR> |
| 152 | * We allow 31 bytes for the stars, the key, the address and the <CR>s |
| 153 | */ |
| 154 | #define STRIP_ENCAP_SIZE(X) (32 + (X)*65L/64L) |
| 155 | |
| 156 | /* |
| 157 | * A STRIP_Header is never really sent over the radio, but making a dummy |
| 158 | * header for internal use within the kernel that looks like an Ethernet |
| 159 | * header makes certain other software happier. For example, tcpdump |
| 160 | * already understands Ethernet headers. |
| 161 | */ |
| 162 | |
| 163 | typedef struct { |
| 164 | MetricomAddress dst_addr; /* Destination address, e.g. "0000-1234" */ |
| 165 | MetricomAddress src_addr; /* Source address, e.g. "0000-5678" */ |
| 166 | unsigned short protocol; /* The protocol type, using Ethernet codes */ |
| 167 | } STRIP_Header; |
| 168 | |
| 169 | typedef struct { |
| 170 | char c[60]; |
| 171 | } MetricomNode; |
| 172 | |
| 173 | #define NODE_TABLE_SIZE 32 |
| 174 | typedef struct { |
| 175 | struct timeval timestamp; |
| 176 | int num_nodes; |
| 177 | MetricomNode node[NODE_TABLE_SIZE]; |
| 178 | } MetricomNodeTable; |
| 179 | |
| 180 | enum { FALSE = 0, TRUE = 1 }; |
| 181 | |
| 182 | /* |
| 183 | * Holds the radio's firmware version. |
| 184 | */ |
| 185 | typedef struct { |
| 186 | char c[50]; |
| 187 | } FirmwareVersion; |
| 188 | |
| 189 | /* |
| 190 | * Holds the radio's serial number. |
| 191 | */ |
| 192 | typedef struct { |
| 193 | char c[18]; |
| 194 | } SerialNumber; |
| 195 | |
| 196 | /* |
| 197 | * Holds the radio's battery voltage. |
| 198 | */ |
| 199 | typedef struct { |
| 200 | char c[11]; |
| 201 | } BatteryVoltage; |
| 202 | |
| 203 | typedef struct { |
| 204 | char c[8]; |
| 205 | } char8; |
| 206 | |
| 207 | enum { |
| 208 | NoStructure = 0, /* Really old firmware */ |
| 209 | StructuredMessages = 1, /* Parsable AT response msgs */ |
| 210 | ChecksummedMessages = 2 /* Parsable AT response msgs with checksums */ |
Jouni Malinen | ff1d276 | 2005-05-12 22:54:16 -0400 | [diff] [blame] | 211 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | struct strip { |
| 214 | int magic; |
| 215 | /* |
| 216 | * These are pointers to the malloc()ed frame buffers. |
| 217 | */ |
| 218 | |
| 219 | unsigned char *rx_buff; /* buffer for received IP packet */ |
| 220 | unsigned char *sx_buff; /* buffer for received serial data */ |
| 221 | int sx_count; /* received serial data counter */ |
| 222 | int sx_size; /* Serial buffer size */ |
| 223 | unsigned char *tx_buff; /* transmitter buffer */ |
| 224 | unsigned char *tx_head; /* pointer to next byte to XMIT */ |
| 225 | int tx_left; /* bytes left in XMIT queue */ |
| 226 | int tx_size; /* Serial buffer size */ |
| 227 | |
| 228 | /* |
| 229 | * STRIP interface statistics. |
| 230 | */ |
| 231 | |
| 232 | unsigned long rx_packets; /* inbound frames counter */ |
| 233 | unsigned long tx_packets; /* outbound frames counter */ |
| 234 | unsigned long rx_errors; /* Parity, etc. errors */ |
| 235 | unsigned long tx_errors; /* Planned stuff */ |
| 236 | unsigned long rx_dropped; /* No memory for skb */ |
| 237 | unsigned long tx_dropped; /* When MTU change */ |
| 238 | unsigned long rx_over_errors; /* Frame bigger then STRIP buf. */ |
| 239 | |
| 240 | unsigned long pps_timer; /* Timer to determine pps */ |
| 241 | unsigned long rx_pps_count; /* Counter to determine pps */ |
| 242 | unsigned long tx_pps_count; /* Counter to determine pps */ |
| 243 | unsigned long sx_pps_count; /* Counter to determine pps */ |
| 244 | unsigned long rx_average_pps; /* rx packets per second * 8 */ |
| 245 | unsigned long tx_average_pps; /* tx packets per second * 8 */ |
| 246 | unsigned long sx_average_pps; /* sent packets per second * 8 */ |
| 247 | |
| 248 | #ifdef EXT_COUNTERS |
| 249 | unsigned long rx_bytes; /* total received bytes */ |
| 250 | unsigned long tx_bytes; /* total received bytes */ |
| 251 | unsigned long rx_rbytes; /* bytes thru radio i/f */ |
| 252 | unsigned long tx_rbytes; /* bytes thru radio i/f */ |
| 253 | unsigned long rx_sbytes; /* tot bytes thru serial i/f */ |
| 254 | unsigned long tx_sbytes; /* tot bytes thru serial i/f */ |
| 255 | unsigned long rx_ebytes; /* tot stat/err bytes */ |
| 256 | unsigned long tx_ebytes; /* tot stat/err bytes */ |
| 257 | #endif |
| 258 | |
| 259 | /* |
| 260 | * Internal variables. |
| 261 | */ |
| 262 | |
| 263 | struct list_head list; /* Linked list of devices */ |
| 264 | |
| 265 | int discard; /* Set if serial error */ |
| 266 | int working; /* Is radio working correctly? */ |
| 267 | int firmware_level; /* Message structuring level */ |
| 268 | int next_command; /* Next periodic command */ |
| 269 | unsigned int user_baud; /* The user-selected baud rate */ |
| 270 | int mtu; /* Our mtu (to spot changes!) */ |
| 271 | long watchdog_doprobe; /* Next time to test the radio */ |
| 272 | long watchdog_doreset; /* Time to do next reset */ |
| 273 | long gratuitous_arp; /* Time to send next ARP refresh */ |
| 274 | long arp_interval; /* Next ARP interval */ |
| 275 | struct timer_list idle_timer; /* For periodic wakeup calls */ |
| 276 | MetricomAddress true_dev_addr; /* True address of radio */ |
| 277 | int manual_dev_addr; /* Hack: See note below */ |
| 278 | |
| 279 | FirmwareVersion firmware_version; /* The radio's firmware version */ |
| 280 | SerialNumber serial_number; /* The radio's serial number */ |
| 281 | BatteryVoltage battery_voltage; /* The radio's battery voltage */ |
| 282 | |
| 283 | /* |
| 284 | * Other useful structures. |
| 285 | */ |
| 286 | |
| 287 | struct tty_struct *tty; /* ptr to TTY structure */ |
| 288 | struct net_device *dev; /* Our device structure */ |
| 289 | |
| 290 | /* |
| 291 | * Neighbour radio records |
| 292 | */ |
| 293 | |
| 294 | MetricomNodeTable portables; |
| 295 | MetricomNodeTable poletops; |
| 296 | }; |
| 297 | |
| 298 | /* |
| 299 | * Note: manual_dev_addr hack |
| 300 | * |
| 301 | * It is not possible to change the hardware address of a Metricom radio, |
| 302 | * or to send packets with a user-specified hardware source address, thus |
| 303 | * trying to manually set a hardware source address is a questionable |
| 304 | * thing to do. However, if the user *does* manually set the hardware |
| 305 | * source address of a STRIP interface, then the kernel will believe it, |
| 306 | * and use it in certain places. For example, the hardware address listed |
| 307 | * by ifconfig will be the manual address, not the true one. |
| 308 | * (Both addresses are listed in /proc/net/strip.) |
| 309 | * Also, ARP packets will be sent out giving the user-specified address as |
| 310 | * the source address, not the real address. This is dangerous, because |
| 311 | * it means you won't receive any replies -- the ARP replies will go to |
| 312 | * the specified address, which will be some other radio. The case where |
| 313 | * this is useful is when that other radio is also connected to the same |
| 314 | * machine. This allows you to connect a pair of radios to one machine, |
| 315 | * and to use one exclusively for inbound traffic, and the other |
| 316 | * exclusively for outbound traffic. Pretty neat, huh? |
| 317 | * |
| 318 | * Here's the full procedure to set this up: |
| 319 | * |
| 320 | * 1. "slattach" two interfaces, e.g. st0 for outgoing packets, |
| 321 | * and st1 for incoming packets |
| 322 | * |
| 323 | * 2. "ifconfig" st0 (outbound radio) to have the hardware address |
| 324 | * which is the real hardware address of st1 (inbound radio). |
| 325 | * Now when it sends out packets, it will masquerade as st1, and |
| 326 | * replies will be sent to that radio, which is exactly what we want. |
| 327 | * |
| 328 | * 3. Set the route table entry ("route add default ..." or |
| 329 | * "route add -net ...", as appropriate) to send packets via the st0 |
| 330 | * interface (outbound radio). Do not add any route which sends packets |
| 331 | * out via the st1 interface -- that radio is for inbound traffic only. |
| 332 | * |
| 333 | * 4. "ifconfig" st1 (inbound radio) to have hardware address zero. |
| 334 | * This tells the STRIP driver to "shut down" that interface and not |
| 335 | * send any packets through it. In particular, it stops sending the |
| 336 | * periodic gratuitous ARP packets that a STRIP interface normally sends. |
| 337 | * Also, when packets arrive on that interface, it will search the |
| 338 | * interface list to see if there is another interface who's manual |
| 339 | * hardware address matches its own real address (i.e. st0 in this |
| 340 | * example) and if so it will transfer ownership of the skbuff to |
| 341 | * that interface, so that it looks to the kernel as if the packet |
| 342 | * arrived on that interface. This is necessary because when the |
| 343 | * kernel sends an ARP packet on st0, it expects to get a reply on |
| 344 | * st0, and if it sees the reply come from st1 then it will ignore |
| 345 | * it (to be accurate, it puts the entry in the ARP table, but |
| 346 | * labelled in such a way that st0 can't use it). |
| 347 | * |
| 348 | * Thanks to Petros Maniatis for coming up with the idea of splitting |
| 349 | * inbound and outbound traffic between two interfaces, which turned |
| 350 | * out to be really easy to implement, even if it is a bit of a hack. |
| 351 | * |
| 352 | * Having set a manual address on an interface, you can restore it |
| 353 | * to automatic operation (where the address is automatically kept |
| 354 | * consistent with the real address of the radio) by setting a manual |
| 355 | * address of all ones, e.g. "ifconfig st0 hw strip FFFFFFFFFFFF" |
| 356 | * This 'turns off' manual override mode for the device address. |
| 357 | * |
| 358 | * Note: The IEEE 802 headers reported in tcpdump will show the *real* |
| 359 | * radio addresses the packets were sent and received from, so that you |
| 360 | * can see what is really going on with packets, and which interfaces |
| 361 | * they are really going through. |
| 362 | */ |
| 363 | |
| 364 | |
| 365 | /************************************************************************/ |
| 366 | /* Constants */ |
| 367 | |
| 368 | /* |
| 369 | * CommandString1 works on all radios |
| 370 | * Other CommandStrings are only used with firmware that provides structured responses. |
| 371 | * |
| 372 | * ats319=1 Enables Info message for node additions and deletions |
| 373 | * ats319=2 Enables Info message for a new best node |
| 374 | * ats319=4 Enables checksums |
| 375 | * ats319=8 Enables ACK messages |
| 376 | */ |
| 377 | |
| 378 | static const int MaxCommandStringLength = 32; |
| 379 | static const int CompatibilityCommand = 1; |
| 380 | |
| 381 | static const char CommandString0[] = "*&COMMAND*ATS319=7"; /* Turn on checksums & info messages */ |
| 382 | static const char CommandString1[] = "*&COMMAND*ATS305?"; /* Query radio name */ |
| 383 | static const char CommandString2[] = "*&COMMAND*ATS325?"; /* Query battery voltage */ |
| 384 | static const char CommandString3[] = "*&COMMAND*ATS300?"; /* Query version information */ |
| 385 | static const char CommandString4[] = "*&COMMAND*ATS311?"; /* Query poletop list */ |
| 386 | static const char CommandString5[] = "*&COMMAND*AT~LA"; /* Query portables list */ |
| 387 | typedef struct { |
| 388 | const char *string; |
| 389 | long length; |
| 390 | } StringDescriptor; |
| 391 | |
| 392 | static const StringDescriptor CommandString[] = { |
| 393 | {CommandString0, sizeof(CommandString0) - 1}, |
| 394 | {CommandString1, sizeof(CommandString1) - 1}, |
| 395 | {CommandString2, sizeof(CommandString2) - 1}, |
| 396 | {CommandString3, sizeof(CommandString3) - 1}, |
| 397 | {CommandString4, sizeof(CommandString4) - 1}, |
| 398 | {CommandString5, sizeof(CommandString5) - 1} |
| 399 | }; |
| 400 | |
| 401 | #define GOT_ALL_RADIO_INFO(S) \ |
| 402 | ((S)->firmware_version.c[0] && \ |
| 403 | (S)->battery_voltage.c[0] && \ |
| 404 | memcmp(&(S)->true_dev_addr, zero_address.c, sizeof(zero_address))) |
| 405 | |
| 406 | static const char hextable[16] = "0123456789ABCDEF"; |
| 407 | |
| 408 | static const MetricomAddress zero_address; |
| 409 | static const MetricomAddress broadcast_address = |
| 410 | { {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF} }; |
| 411 | |
| 412 | static const MetricomKey SIP0Key = { "SIP0" }; |
| 413 | static const MetricomKey ARP0Key = { "ARP0" }; |
| 414 | static const MetricomKey ATR_Key = { "ATR " }; |
| 415 | static const MetricomKey ACK_Key = { "ACK_" }; |
| 416 | static const MetricomKey INF_Key = { "INF_" }; |
| 417 | static const MetricomKey ERR_Key = { "ERR_" }; |
| 418 | |
| 419 | static const long MaxARPInterval = 60 * HZ; /* One minute */ |
| 420 | |
| 421 | /* |
| 422 | * Maximum Starmode packet length is 1183 bytes. Allowing 4 bytes for |
| 423 | * protocol key, 4 bytes for checksum, one byte for CR, and 65/64 expansion |
| 424 | * for STRIP encoding, that translates to a maximum payload MTU of 1155. |
| 425 | * Note: A standard NFS 1K data packet is a total of 0x480 (1152) bytes |
| 426 | * long, including IP header, UDP header, and NFS header. Setting the STRIP |
| 427 | * MTU to 1152 allows us to send default sized NFS packets without fragmentation. |
| 428 | */ |
| 429 | static const unsigned short MAX_SEND_MTU = 1152; |
| 430 | static const unsigned short MAX_RECV_MTU = 1500; /* Hoping for Ethernet sized packets in the future! */ |
| 431 | static const unsigned short DEFAULT_STRIP_MTU = 1152; |
| 432 | static const int STRIP_MAGIC = 0x5303; |
| 433 | static const long LongTime = 0x7FFFFFFF; |
| 434 | |
| 435 | /************************************************************************/ |
| 436 | /* Global variables */ |
| 437 | |
| 438 | static LIST_HEAD(strip_list); |
| 439 | static DEFINE_SPINLOCK(strip_lock); |
| 440 | |
| 441 | /************************************************************************/ |
| 442 | /* Macros */ |
| 443 | |
| 444 | /* Returns TRUE if text T begins with prefix P */ |
| 445 | #define has_prefix(T,L,P) (((L) >= sizeof(P)-1) && !strncmp((T), (P), sizeof(P)-1)) |
| 446 | |
| 447 | /* Returns TRUE if text T of length L is equal to string S */ |
| 448 | #define text_equal(T,L,S) (((L) == sizeof(S)-1) && !strncmp((T), (S), sizeof(S)-1)) |
| 449 | |
| 450 | #define READHEX(X) ((X)>='0' && (X)<='9' ? (X)-'0' : \ |
| 451 | (X)>='a' && (X)<='f' ? (X)-'a'+10 : \ |
| 452 | (X)>='A' && (X)<='F' ? (X)-'A'+10 : 0 ) |
| 453 | |
| 454 | #define READHEX16(X) ((__u16)(READHEX(X))) |
| 455 | |
| 456 | #define READDEC(X) ((X)>='0' && (X)<='9' ? (X)-'0' : 0) |
| 457 | |
| 458 | #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) |
| 459 | |
| 460 | #define JIFFIE_TO_SEC(X) ((X) / HZ) |
| 461 | |
| 462 | |
| 463 | /************************************************************************/ |
| 464 | /* Utility routines */ |
| 465 | |
| 466 | static int arp_query(unsigned char *haddr, u32 paddr, |
| 467 | struct net_device *dev) |
| 468 | { |
| 469 | struct neighbour *neighbor_entry; |
| 470 | |
| 471 | neighbor_entry = neigh_lookup(&arp_tbl, &paddr, dev); |
| 472 | |
| 473 | if (neighbor_entry != NULL) { |
| 474 | neighbor_entry->used = jiffies; |
| 475 | if (neighbor_entry->nud_state & NUD_VALID) { |
| 476 | memcpy(haddr, neighbor_entry->ha, dev->addr_len); |
| 477 | return 1; |
| 478 | } |
| 479 | } |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static void DumpData(char *msg, struct strip *strip_info, __u8 * ptr, |
| 484 | __u8 * end) |
| 485 | { |
| 486 | static const int MAX_DumpData = 80; |
| 487 | __u8 pkt_text[MAX_DumpData], *p = pkt_text; |
| 488 | |
| 489 | *p++ = '\"'; |
| 490 | |
| 491 | while (ptr < end && p < &pkt_text[MAX_DumpData - 4]) { |
| 492 | if (*ptr == '\\') { |
| 493 | *p++ = '\\'; |
| 494 | *p++ = '\\'; |
| 495 | } else { |
| 496 | if (*ptr >= 32 && *ptr <= 126) { |
| 497 | *p++ = *ptr; |
| 498 | } else { |
| 499 | sprintf(p, "\\%02X", *ptr); |
| 500 | p += 3; |
| 501 | } |
| 502 | } |
| 503 | ptr++; |
| 504 | } |
| 505 | |
| 506 | if (ptr == end) |
| 507 | *p++ = '\"'; |
| 508 | *p++ = 0; |
| 509 | |
| 510 | printk(KERN_INFO "%s: %-13s%s\n", strip_info->dev->name, msg, pkt_text); |
| 511 | } |
| 512 | |
| 513 | |
| 514 | /************************************************************************/ |
| 515 | /* Byte stuffing/unstuffing routines */ |
| 516 | |
| 517 | /* Stuffing scheme: |
| 518 | * 00 Unused (reserved character) |
| 519 | * 01-3F Run of 2-64 different characters |
| 520 | * 40-7F Run of 1-64 different characters plus a single zero at the end |
| 521 | * 80-BF Run of 1-64 of the same character |
| 522 | * C0-FF Run of 1-64 zeroes (ASCII 0) |
| 523 | */ |
| 524 | |
| 525 | typedef enum { |
| 526 | Stuff_Diff = 0x00, |
| 527 | Stuff_DiffZero = 0x40, |
| 528 | Stuff_Same = 0x80, |
| 529 | Stuff_Zero = 0xC0, |
| 530 | Stuff_NoCode = 0xFF, /* Special code, meaning no code selected */ |
| 531 | |
| 532 | Stuff_CodeMask = 0xC0, |
| 533 | Stuff_CountMask = 0x3F, |
| 534 | Stuff_MaxCount = 0x3F, |
| 535 | Stuff_Magic = 0x0D /* The value we are eliminating */ |
| 536 | } StuffingCode; |
| 537 | |
| 538 | /* StuffData encodes the data starting at "src" for "length" bytes. |
| 539 | * It writes it to the buffer pointed to by "dst" (which must be at least |
| 540 | * as long as 1 + 65/64 of the input length). The output may be up to 1.6% |
| 541 | * larger than the input for pathological input, but will usually be smaller. |
| 542 | * StuffData returns the new value of the dst pointer as its result. |
| 543 | * "code_ptr_ptr" points to a "__u8 *" which is used to hold encoding state |
| 544 | * between calls, allowing an encoded packet to be incrementally built up |
| 545 | * from small parts. On the first call, the "__u8 *" pointed to should be |
| 546 | * initialized to NULL; between subsequent calls the calling routine should |
| 547 | * leave the value alone and simply pass it back unchanged so that the |
| 548 | * encoder can recover its current state. |
| 549 | */ |
| 550 | |
| 551 | #define StuffData_FinishBlock(X) \ |
| 552 | (*code_ptr = (X) ^ Stuff_Magic, code = Stuff_NoCode) |
| 553 | |
| 554 | static __u8 *StuffData(__u8 * src, __u32 length, __u8 * dst, |
| 555 | __u8 ** code_ptr_ptr) |
| 556 | { |
| 557 | __u8 *end = src + length; |
| 558 | __u8 *code_ptr = *code_ptr_ptr; |
| 559 | __u8 code = Stuff_NoCode, count = 0; |
| 560 | |
| 561 | if (!length) |
| 562 | return (dst); |
| 563 | |
| 564 | if (code_ptr) { |
| 565 | /* |
| 566 | * Recover state from last call, if applicable |
| 567 | */ |
| 568 | code = (*code_ptr ^ Stuff_Magic) & Stuff_CodeMask; |
| 569 | count = (*code_ptr ^ Stuff_Magic) & Stuff_CountMask; |
| 570 | } |
| 571 | |
| 572 | while (src < end) { |
| 573 | switch (code) { |
| 574 | /* Stuff_NoCode: If no current code, select one */ |
| 575 | case Stuff_NoCode: |
| 576 | /* Record where we're going to put this code */ |
| 577 | code_ptr = dst++; |
| 578 | count = 0; /* Reset the count (zero means one instance) */ |
| 579 | /* Tentatively start a new block */ |
| 580 | if (*src == 0) { |
| 581 | code = Stuff_Zero; |
| 582 | src++; |
| 583 | } else { |
| 584 | code = Stuff_Same; |
| 585 | *dst++ = *src++ ^ Stuff_Magic; |
| 586 | } |
| 587 | /* Note: We optimistically assume run of same -- */ |
| 588 | /* which will be fixed later in Stuff_Same */ |
| 589 | /* if it turns out not to be true. */ |
| 590 | break; |
| 591 | |
| 592 | /* Stuff_Zero: We already have at least one zero encoded */ |
| 593 | case Stuff_Zero: |
| 594 | /* If another zero, count it, else finish this code block */ |
| 595 | if (*src == 0) { |
| 596 | count++; |
| 597 | src++; |
| 598 | } else { |
| 599 | StuffData_FinishBlock(Stuff_Zero + count); |
| 600 | } |
| 601 | break; |
| 602 | |
| 603 | /* Stuff_Same: We already have at least one byte encoded */ |
| 604 | case Stuff_Same: |
| 605 | /* If another one the same, count it */ |
| 606 | if ((*src ^ Stuff_Magic) == code_ptr[1]) { |
| 607 | count++; |
| 608 | src++; |
| 609 | break; |
| 610 | } |
| 611 | /* else, this byte does not match this block. */ |
| 612 | /* If we already have two or more bytes encoded, finish this code block */ |
| 613 | if (count) { |
| 614 | StuffData_FinishBlock(Stuff_Same + count); |
| 615 | break; |
| 616 | } |
| 617 | /* else, we only have one so far, so switch to Stuff_Diff code */ |
| 618 | code = Stuff_Diff; |
| 619 | /* and fall through to Stuff_Diff case below |
| 620 | * Note cunning cleverness here: case Stuff_Diff compares |
| 621 | * the current character with the previous two to see if it |
| 622 | * has a run of three the same. Won't this be an error if |
| 623 | * there aren't two previous characters stored to compare with? |
| 624 | * No. Because we know the current character is *not* the same |
| 625 | * as the previous one, the first test below will necessarily |
| 626 | * fail and the send half of the "if" won't be executed. |
| 627 | */ |
| 628 | |
| 629 | /* Stuff_Diff: We have at least two *different* bytes encoded */ |
| 630 | case Stuff_Diff: |
| 631 | /* If this is a zero, must encode a Stuff_DiffZero, and begin a new block */ |
| 632 | if (*src == 0) { |
| 633 | StuffData_FinishBlock(Stuff_DiffZero + |
| 634 | count); |
| 635 | } |
| 636 | /* else, if we have three in a row, it is worth starting a Stuff_Same block */ |
| 637 | else if ((*src ^ Stuff_Magic) == dst[-1] |
| 638 | && dst[-1] == dst[-2]) { |
| 639 | /* Back off the last two characters we encoded */ |
| 640 | code += count - 2; |
| 641 | /* Note: "Stuff_Diff + 0" is an illegal code */ |
| 642 | if (code == Stuff_Diff + 0) { |
| 643 | code = Stuff_Same + 0; |
| 644 | } |
| 645 | StuffData_FinishBlock(code); |
| 646 | code_ptr = dst - 2; |
| 647 | /* dst[-1] already holds the correct value */ |
| 648 | count = 2; /* 2 means three bytes encoded */ |
| 649 | code = Stuff_Same; |
| 650 | } |
| 651 | /* else, another different byte, so add it to the block */ |
| 652 | else { |
| 653 | *dst++ = *src ^ Stuff_Magic; |
| 654 | count++; |
| 655 | } |
| 656 | src++; /* Consume the byte */ |
| 657 | break; |
| 658 | } |
| 659 | if (count == Stuff_MaxCount) { |
| 660 | StuffData_FinishBlock(code + count); |
| 661 | } |
| 662 | } |
| 663 | if (code == Stuff_NoCode) { |
| 664 | *code_ptr_ptr = NULL; |
| 665 | } else { |
| 666 | *code_ptr_ptr = code_ptr; |
| 667 | StuffData_FinishBlock(code + count); |
| 668 | } |
| 669 | return (dst); |
| 670 | } |
| 671 | |
| 672 | /* |
| 673 | * UnStuffData decodes the data at "src", up to (but not including) "end". |
| 674 | * It writes the decoded data into the buffer pointed to by "dst", up to a |
| 675 | * maximum of "dst_length", and returns the new value of "src" so that a |
| 676 | * follow-on call can read more data, continuing from where the first left off. |
| 677 | * |
| 678 | * There are three types of results: |
| 679 | * 1. The source data runs out before extracting "dst_length" bytes: |
| 680 | * UnStuffData returns NULL to indicate failure. |
| 681 | * 2. The source data produces exactly "dst_length" bytes: |
| 682 | * UnStuffData returns new_src = end to indicate that all bytes were consumed. |
| 683 | * 3. "dst_length" bytes are extracted, with more remaining. |
| 684 | * UnStuffData returns new_src < end to indicate that there are more bytes |
| 685 | * to be read. |
| 686 | * |
| 687 | * Note: The decoding may be destructive, in that it may alter the source |
| 688 | * data in the process of decoding it (this is necessary to allow a follow-on |
| 689 | * call to resume correctly). |
| 690 | */ |
| 691 | |
| 692 | static __u8 *UnStuffData(__u8 * src, __u8 * end, __u8 * dst, |
| 693 | __u32 dst_length) |
| 694 | { |
| 695 | __u8 *dst_end = dst + dst_length; |
| 696 | /* Sanity check */ |
| 697 | if (!src || !end || !dst || !dst_length) |
| 698 | return (NULL); |
| 699 | while (src < end && dst < dst_end) { |
| 700 | int count = (*src ^ Stuff_Magic) & Stuff_CountMask; |
| 701 | switch ((*src ^ Stuff_Magic) & Stuff_CodeMask) { |
| 702 | case Stuff_Diff: |
| 703 | if (src + 1 + count >= end) |
| 704 | return (NULL); |
| 705 | do { |
| 706 | *dst++ = *++src ^ Stuff_Magic; |
| 707 | } |
| 708 | while (--count >= 0 && dst < dst_end); |
| 709 | if (count < 0) |
| 710 | src += 1; |
| 711 | else { |
| 712 | if (count == 0) |
| 713 | *src = Stuff_Same ^ Stuff_Magic; |
| 714 | else |
| 715 | *src = |
| 716 | (Stuff_Diff + |
| 717 | count) ^ Stuff_Magic; |
| 718 | } |
| 719 | break; |
| 720 | case Stuff_DiffZero: |
| 721 | if (src + 1 + count >= end) |
| 722 | return (NULL); |
| 723 | do { |
| 724 | *dst++ = *++src ^ Stuff_Magic; |
| 725 | } |
| 726 | while (--count >= 0 && dst < dst_end); |
| 727 | if (count < 0) |
| 728 | *src = Stuff_Zero ^ Stuff_Magic; |
| 729 | else |
| 730 | *src = |
| 731 | (Stuff_DiffZero + count) ^ Stuff_Magic; |
| 732 | break; |
| 733 | case Stuff_Same: |
| 734 | if (src + 1 >= end) |
| 735 | return (NULL); |
| 736 | do { |
| 737 | *dst++ = src[1] ^ Stuff_Magic; |
| 738 | } |
| 739 | while (--count >= 0 && dst < dst_end); |
| 740 | if (count < 0) |
| 741 | src += 2; |
| 742 | else |
| 743 | *src = (Stuff_Same + count) ^ Stuff_Magic; |
| 744 | break; |
| 745 | case Stuff_Zero: |
| 746 | do { |
| 747 | *dst++ = 0; |
| 748 | } |
| 749 | while (--count >= 0 && dst < dst_end); |
| 750 | if (count < 0) |
| 751 | src += 1; |
| 752 | else |
| 753 | *src = (Stuff_Zero + count) ^ Stuff_Magic; |
| 754 | break; |
| 755 | } |
| 756 | } |
| 757 | if (dst < dst_end) |
| 758 | return (NULL); |
| 759 | else |
| 760 | return (src); |
| 761 | } |
| 762 | |
| 763 | |
| 764 | /************************************************************************/ |
| 765 | /* General routines for STRIP */ |
| 766 | |
| 767 | /* |
| 768 | * get_baud returns the current baud rate, as one of the constants defined in |
| 769 | * termbits.h |
| 770 | * If the user has issued a baud rate override using the 'setserial' command |
| 771 | * and the logical current rate is set to 38.4, then the true baud rate |
| 772 | * currently in effect (57.6 or 115.2) is returned. |
| 773 | */ |
| 774 | static unsigned int get_baud(struct tty_struct *tty) |
| 775 | { |
| 776 | if (!tty || !tty->termios) |
| 777 | return (0); |
| 778 | if ((tty->termios->c_cflag & CBAUD) == B38400 && tty->driver_data) { |
| 779 | struct async_struct *info = |
| 780 | (struct async_struct *) tty->driver_data; |
| 781 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
| 782 | return (B57600); |
| 783 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
| 784 | return (B115200); |
| 785 | } |
| 786 | return (tty->termios->c_cflag & CBAUD); |
| 787 | } |
| 788 | |
| 789 | /* |
| 790 | * set_baud sets the baud rate to the rate defined by baudcode |
| 791 | * Note: The rate B38400 should be avoided, because the user may have |
| 792 | * issued a 'setserial' speed override to map that to a different speed. |
| 793 | * We could achieve a true rate of 38400 if we needed to by cancelling |
| 794 | * any user speed override that is in place, but that might annoy the |
| 795 | * user, so it is simplest to just avoid using 38400. |
| 796 | */ |
| 797 | static void set_baud(struct tty_struct *tty, unsigned int baudcode) |
| 798 | { |
| 799 | struct termios old_termios = *(tty->termios); |
| 800 | tty->termios->c_cflag &= ~CBAUD; /* Clear the old baud setting */ |
| 801 | tty->termios->c_cflag |= baudcode; /* Set the new baud setting */ |
| 802 | tty->driver->set_termios(tty, &old_termios); |
| 803 | } |
| 804 | |
| 805 | /* |
| 806 | * Convert a string to a Metricom Address. |
| 807 | */ |
| 808 | |
| 809 | #define IS_RADIO_ADDRESS(p) ( \ |
| 810 | isdigit((p)[0]) && isdigit((p)[1]) && isdigit((p)[2]) && isdigit((p)[3]) && \ |
| 811 | (p)[4] == '-' && \ |
| 812 | isdigit((p)[5]) && isdigit((p)[6]) && isdigit((p)[7]) && isdigit((p)[8]) ) |
| 813 | |
| 814 | static int string_to_radio_address(MetricomAddress * addr, __u8 * p) |
| 815 | { |
| 816 | if (!IS_RADIO_ADDRESS(p)) |
| 817 | return (1); |
| 818 | addr->c[0] = 0; |
| 819 | addr->c[1] = 0; |
| 820 | addr->c[2] = READHEX(p[0]) << 4 | READHEX(p[1]); |
| 821 | addr->c[3] = READHEX(p[2]) << 4 | READHEX(p[3]); |
| 822 | addr->c[4] = READHEX(p[5]) << 4 | READHEX(p[6]); |
| 823 | addr->c[5] = READHEX(p[7]) << 4 | READHEX(p[8]); |
| 824 | return (0); |
| 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Convert a Metricom Address to a string. |
| 829 | */ |
| 830 | |
| 831 | static __u8 *radio_address_to_string(const MetricomAddress * addr, |
| 832 | MetricomAddressString * p) |
| 833 | { |
| 834 | sprintf(p->c, "%02X%02X-%02X%02X", addr->c[2], addr->c[3], |
| 835 | addr->c[4], addr->c[5]); |
| 836 | return (p->c); |
| 837 | } |
| 838 | |
| 839 | /* |
| 840 | * Note: Must make sure sx_size is big enough to receive a stuffed |
| 841 | * MAX_RECV_MTU packet. Additionally, we also want to ensure that it's |
| 842 | * big enough to receive a large radio neighbour list (currently 4K). |
| 843 | */ |
| 844 | |
| 845 | static int allocate_buffers(struct strip *strip_info, int mtu) |
| 846 | { |
| 847 | struct net_device *dev = strip_info->dev; |
| 848 | int sx_size = max_t(int, STRIP_ENCAP_SIZE(MAX_RECV_MTU), 4096); |
| 849 | int tx_size = STRIP_ENCAP_SIZE(mtu) + MaxCommandStringLength; |
| 850 | __u8 *r = kmalloc(MAX_RECV_MTU, GFP_ATOMIC); |
| 851 | __u8 *s = kmalloc(sx_size, GFP_ATOMIC); |
| 852 | __u8 *t = kmalloc(tx_size, GFP_ATOMIC); |
| 853 | if (r && s && t) { |
| 854 | strip_info->rx_buff = r; |
| 855 | strip_info->sx_buff = s; |
| 856 | strip_info->tx_buff = t; |
| 857 | strip_info->sx_size = sx_size; |
| 858 | strip_info->tx_size = tx_size; |
| 859 | strip_info->mtu = dev->mtu = mtu; |
| 860 | return (1); |
| 861 | } |
Jesper Juhl | b4558ea | 2005-10-28 16:53:13 -0400 | [diff] [blame] | 862 | kfree(r); |
| 863 | kfree(s); |
| 864 | kfree(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | return (0); |
| 866 | } |
| 867 | |
| 868 | /* |
| 869 | * MTU has been changed by the IP layer. |
| 870 | * We could be in |
| 871 | * an upcall from the tty driver, or in an ip packet queue. |
| 872 | */ |
| 873 | static int strip_change_mtu(struct net_device *dev, int new_mtu) |
| 874 | { |
| 875 | struct strip *strip_info = netdev_priv(dev); |
| 876 | int old_mtu = strip_info->mtu; |
| 877 | unsigned char *orbuff = strip_info->rx_buff; |
| 878 | unsigned char *osbuff = strip_info->sx_buff; |
| 879 | unsigned char *otbuff = strip_info->tx_buff; |
| 880 | |
| 881 | if (new_mtu > MAX_SEND_MTU) { |
| 882 | printk(KERN_ERR |
| 883 | "%s: MTU exceeds maximum allowable (%d), MTU change cancelled.\n", |
| 884 | strip_info->dev->name, MAX_SEND_MTU); |
| 885 | return -EINVAL; |
| 886 | } |
| 887 | |
| 888 | spin_lock_bh(&strip_lock); |
| 889 | if (!allocate_buffers(strip_info, new_mtu)) { |
| 890 | printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n", |
| 891 | strip_info->dev->name); |
| 892 | spin_unlock_bh(&strip_lock); |
| 893 | return -ENOMEM; |
| 894 | } |
| 895 | |
| 896 | if (strip_info->sx_count) { |
| 897 | if (strip_info->sx_count <= strip_info->sx_size) |
| 898 | memcpy(strip_info->sx_buff, osbuff, |
| 899 | strip_info->sx_count); |
| 900 | else { |
| 901 | strip_info->discard = strip_info->sx_count; |
| 902 | strip_info->rx_over_errors++; |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | if (strip_info->tx_left) { |
| 907 | if (strip_info->tx_left <= strip_info->tx_size) |
| 908 | memcpy(strip_info->tx_buff, strip_info->tx_head, |
| 909 | strip_info->tx_left); |
| 910 | else { |
| 911 | strip_info->tx_left = 0; |
| 912 | strip_info->tx_dropped++; |
| 913 | } |
| 914 | } |
| 915 | strip_info->tx_head = strip_info->tx_buff; |
| 916 | spin_unlock_bh(&strip_lock); |
| 917 | |
| 918 | printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n", |
| 919 | strip_info->dev->name, old_mtu, strip_info->mtu); |
| 920 | |
Jesper Juhl | b4558ea | 2005-10-28 16:53:13 -0400 | [diff] [blame] | 921 | kfree(orbuff); |
| 922 | kfree(osbuff); |
| 923 | kfree(otbuff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | return 0; |
| 925 | } |
| 926 | |
| 927 | static void strip_unlock(struct strip *strip_info) |
| 928 | { |
| 929 | /* |
| 930 | * Set the timer to go off in one second. |
| 931 | */ |
| 932 | strip_info->idle_timer.expires = jiffies + 1 * HZ; |
| 933 | add_timer(&strip_info->idle_timer); |
| 934 | netif_wake_queue(strip_info->dev); |
| 935 | } |
| 936 | |
| 937 | |
| 938 | |
| 939 | /* |
| 940 | * If the time is in the near future, time_delta prints the number of |
| 941 | * seconds to go into the buffer and returns the address of the buffer. |
| 942 | * If the time is not in the near future, it returns the address of the |
| 943 | * string "Not scheduled" The buffer must be long enough to contain the |
| 944 | * ascii representation of the number plus 9 charactes for the " seconds" |
| 945 | * and the null character. |
| 946 | */ |
| 947 | #ifdef CONFIG_PROC_FS |
| 948 | static char *time_delta(char buffer[], long time) |
| 949 | { |
| 950 | time -= jiffies; |
| 951 | if (time > LongTime / 2) |
| 952 | return ("Not scheduled"); |
| 953 | if (time < 0) |
| 954 | time = 0; /* Don't print negative times */ |
| 955 | sprintf(buffer, "%ld seconds", time / HZ); |
| 956 | return (buffer); |
| 957 | } |
| 958 | |
| 959 | /* get Nth element of the linked list */ |
| 960 | static struct strip *strip_get_idx(loff_t pos) |
| 961 | { |
| 962 | struct list_head *l; |
| 963 | int i = 0; |
| 964 | |
| 965 | list_for_each_rcu(l, &strip_list) { |
| 966 | if (pos == i) |
| 967 | return list_entry(l, struct strip, list); |
| 968 | ++i; |
| 969 | } |
| 970 | return NULL; |
| 971 | } |
| 972 | |
| 973 | static void *strip_seq_start(struct seq_file *seq, loff_t *pos) |
| 974 | { |
| 975 | rcu_read_lock(); |
| 976 | return *pos ? strip_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| 977 | } |
| 978 | |
| 979 | static void *strip_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 980 | { |
| 981 | struct list_head *l; |
| 982 | struct strip *s; |
| 983 | |
| 984 | ++*pos; |
| 985 | if (v == SEQ_START_TOKEN) |
| 986 | return strip_get_idx(1); |
| 987 | |
| 988 | s = v; |
| 989 | l = &s->list; |
| 990 | list_for_each_continue_rcu(l, &strip_list) { |
| 991 | return list_entry(l, struct strip, list); |
| 992 | } |
| 993 | return NULL; |
| 994 | } |
| 995 | |
| 996 | static void strip_seq_stop(struct seq_file *seq, void *v) |
| 997 | { |
| 998 | rcu_read_unlock(); |
| 999 | } |
| 1000 | |
| 1001 | static void strip_seq_neighbours(struct seq_file *seq, |
| 1002 | const MetricomNodeTable * table, |
| 1003 | const char *title) |
| 1004 | { |
| 1005 | /* We wrap this in a do/while loop, so if the table changes */ |
| 1006 | /* while we're reading it, we just go around and try again. */ |
| 1007 | struct timeval t; |
| 1008 | |
| 1009 | do { |
| 1010 | int i; |
| 1011 | t = table->timestamp; |
| 1012 | if (table->num_nodes) |
| 1013 | seq_printf(seq, "\n %s\n", title); |
| 1014 | for (i = 0; i < table->num_nodes; i++) { |
| 1015 | MetricomNode node; |
| 1016 | |
| 1017 | spin_lock_bh(&strip_lock); |
| 1018 | node = table->node[i]; |
| 1019 | spin_unlock_bh(&strip_lock); |
| 1020 | seq_printf(seq, " %s\n", node.c); |
| 1021 | } |
| 1022 | } while (table->timestamp.tv_sec != t.tv_sec |
| 1023 | || table->timestamp.tv_usec != t.tv_usec); |
| 1024 | } |
| 1025 | |
| 1026 | /* |
| 1027 | * This function prints radio status information via the seq_file |
| 1028 | * interface. The interface takes care of buffer size and over |
| 1029 | * run issues. |
| 1030 | * |
| 1031 | * The buffer in seq_file is PAGESIZE (4K) |
| 1032 | * so this routine should never print more or it will get truncated. |
| 1033 | * With the maximum of 32 portables and 32 poletops |
| 1034 | * reported, the routine outputs 3107 bytes into the buffer. |
| 1035 | */ |
| 1036 | static void strip_seq_status_info(struct seq_file *seq, |
| 1037 | const struct strip *strip_info) |
| 1038 | { |
| 1039 | char temp[32]; |
| 1040 | MetricomAddressString addr_string; |
| 1041 | |
| 1042 | /* First, we must copy all of our data to a safe place, */ |
| 1043 | /* in case a serial interrupt comes in and changes it. */ |
| 1044 | int tx_left = strip_info->tx_left; |
| 1045 | unsigned long rx_average_pps = strip_info->rx_average_pps; |
| 1046 | unsigned long tx_average_pps = strip_info->tx_average_pps; |
| 1047 | unsigned long sx_average_pps = strip_info->sx_average_pps; |
| 1048 | int working = strip_info->working; |
| 1049 | int firmware_level = strip_info->firmware_level; |
| 1050 | long watchdog_doprobe = strip_info->watchdog_doprobe; |
| 1051 | long watchdog_doreset = strip_info->watchdog_doreset; |
| 1052 | long gratuitous_arp = strip_info->gratuitous_arp; |
| 1053 | long arp_interval = strip_info->arp_interval; |
| 1054 | FirmwareVersion firmware_version = strip_info->firmware_version; |
| 1055 | SerialNumber serial_number = strip_info->serial_number; |
| 1056 | BatteryVoltage battery_voltage = strip_info->battery_voltage; |
| 1057 | char *if_name = strip_info->dev->name; |
| 1058 | MetricomAddress true_dev_addr = strip_info->true_dev_addr; |
| 1059 | MetricomAddress dev_dev_addr = |
| 1060 | *(MetricomAddress *) strip_info->dev->dev_addr; |
| 1061 | int manual_dev_addr = strip_info->manual_dev_addr; |
| 1062 | #ifdef EXT_COUNTERS |
| 1063 | unsigned long rx_bytes = strip_info->rx_bytes; |
| 1064 | unsigned long tx_bytes = strip_info->tx_bytes; |
| 1065 | unsigned long rx_rbytes = strip_info->rx_rbytes; |
| 1066 | unsigned long tx_rbytes = strip_info->tx_rbytes; |
| 1067 | unsigned long rx_sbytes = strip_info->rx_sbytes; |
| 1068 | unsigned long tx_sbytes = strip_info->tx_sbytes; |
| 1069 | unsigned long rx_ebytes = strip_info->rx_ebytes; |
| 1070 | unsigned long tx_ebytes = strip_info->tx_ebytes; |
| 1071 | #endif |
| 1072 | |
| 1073 | seq_printf(seq, "\nInterface name\t\t%s\n", if_name); |
| 1074 | seq_printf(seq, " Radio working:\t\t%s\n", working ? "Yes" : "No"); |
| 1075 | radio_address_to_string(&true_dev_addr, &addr_string); |
| 1076 | seq_printf(seq, " Radio address:\t\t%s\n", addr_string.c); |
| 1077 | if (manual_dev_addr) { |
| 1078 | radio_address_to_string(&dev_dev_addr, &addr_string); |
| 1079 | seq_printf(seq, " Device address:\t%s\n", addr_string.c); |
| 1080 | } |
| 1081 | seq_printf(seq, " Firmware version:\t%s", !working ? "Unknown" : |
| 1082 | !firmware_level ? "Should be upgraded" : |
| 1083 | firmware_version.c); |
| 1084 | if (firmware_level >= ChecksummedMessages) |
| 1085 | seq_printf(seq, " (Checksums Enabled)"); |
| 1086 | seq_printf(seq, "\n"); |
| 1087 | seq_printf(seq, " Serial number:\t\t%s\n", serial_number.c); |
| 1088 | seq_printf(seq, " Battery voltage:\t%s\n", battery_voltage.c); |
| 1089 | seq_printf(seq, " Transmit queue (bytes):%d\n", tx_left); |
| 1090 | seq_printf(seq, " Receive packet rate: %ld packets per second\n", |
| 1091 | rx_average_pps / 8); |
| 1092 | seq_printf(seq, " Transmit packet rate: %ld packets per second\n", |
| 1093 | tx_average_pps / 8); |
| 1094 | seq_printf(seq, " Sent packet rate: %ld packets per second\n", |
| 1095 | sx_average_pps / 8); |
| 1096 | seq_printf(seq, " Next watchdog probe:\t%s\n", |
| 1097 | time_delta(temp, watchdog_doprobe)); |
| 1098 | seq_printf(seq, " Next watchdog reset:\t%s\n", |
| 1099 | time_delta(temp, watchdog_doreset)); |
| 1100 | seq_printf(seq, " Next gratuitous ARP:\t"); |
| 1101 | |
| 1102 | if (!memcmp |
| 1103 | (strip_info->dev->dev_addr, zero_address.c, |
| 1104 | sizeof(zero_address))) |
| 1105 | seq_printf(seq, "Disabled\n"); |
| 1106 | else { |
| 1107 | seq_printf(seq, "%s\n", time_delta(temp, gratuitous_arp)); |
| 1108 | seq_printf(seq, " Next ARP interval:\t%ld seconds\n", |
| 1109 | JIFFIE_TO_SEC(arp_interval)); |
| 1110 | } |
| 1111 | |
| 1112 | if (working) { |
| 1113 | #ifdef EXT_COUNTERS |
| 1114 | seq_printf(seq, "\n"); |
| 1115 | seq_printf(seq, |
| 1116 | " Total bytes: \trx:\t%lu\ttx:\t%lu\n", |
| 1117 | rx_bytes, tx_bytes); |
| 1118 | seq_printf(seq, |
| 1119 | " thru radio: \trx:\t%lu\ttx:\t%lu\n", |
| 1120 | rx_rbytes, tx_rbytes); |
| 1121 | seq_printf(seq, |
| 1122 | " thru serial port: \trx:\t%lu\ttx:\t%lu\n", |
| 1123 | rx_sbytes, tx_sbytes); |
| 1124 | seq_printf(seq, |
| 1125 | " Total stat/err bytes:\trx:\t%lu\ttx:\t%lu\n", |
| 1126 | rx_ebytes, tx_ebytes); |
| 1127 | #endif |
| 1128 | strip_seq_neighbours(seq, &strip_info->poletops, |
| 1129 | "Poletops:"); |
| 1130 | strip_seq_neighbours(seq, &strip_info->portables, |
| 1131 | "Portables:"); |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * This function is exports status information from the STRIP driver through |
| 1137 | * the /proc file system. |
| 1138 | */ |
| 1139 | static int strip_seq_show(struct seq_file *seq, void *v) |
| 1140 | { |
| 1141 | if (v == SEQ_START_TOKEN) |
| 1142 | seq_printf(seq, "strip_version: %s\n", StripVersion); |
| 1143 | else |
| 1144 | strip_seq_status_info(seq, (const struct strip *)v); |
| 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | |
| 1149 | static struct seq_operations strip_seq_ops = { |
| 1150 | .start = strip_seq_start, |
| 1151 | .next = strip_seq_next, |
| 1152 | .stop = strip_seq_stop, |
| 1153 | .show = strip_seq_show, |
| 1154 | }; |
| 1155 | |
| 1156 | static int strip_seq_open(struct inode *inode, struct file *file) |
| 1157 | { |
| 1158 | return seq_open(file, &strip_seq_ops); |
| 1159 | } |
| 1160 | |
| 1161 | static struct file_operations strip_seq_fops = { |
| 1162 | .owner = THIS_MODULE, |
| 1163 | .open = strip_seq_open, |
| 1164 | .read = seq_read, |
| 1165 | .llseek = seq_lseek, |
| 1166 | .release = seq_release, |
| 1167 | }; |
| 1168 | #endif |
| 1169 | |
| 1170 | |
| 1171 | |
| 1172 | /************************************************************************/ |
| 1173 | /* Sending routines */ |
| 1174 | |
| 1175 | static void ResetRadio(struct strip *strip_info) |
| 1176 | { |
| 1177 | struct tty_struct *tty = strip_info->tty; |
| 1178 | static const char init[] = "ate0q1dt**starmode\r**"; |
| 1179 | StringDescriptor s = { init, sizeof(init) - 1 }; |
| 1180 | |
| 1181 | /* |
| 1182 | * If the radio isn't working anymore, |
| 1183 | * we should clear the old status information. |
| 1184 | */ |
| 1185 | if (strip_info->working) { |
| 1186 | printk(KERN_INFO "%s: No response: Resetting radio.\n", |
| 1187 | strip_info->dev->name); |
| 1188 | strip_info->firmware_version.c[0] = '\0'; |
| 1189 | strip_info->serial_number.c[0] = '\0'; |
| 1190 | strip_info->battery_voltage.c[0] = '\0'; |
| 1191 | strip_info->portables.num_nodes = 0; |
| 1192 | do_gettimeofday(&strip_info->portables.timestamp); |
| 1193 | strip_info->poletops.num_nodes = 0; |
| 1194 | do_gettimeofday(&strip_info->poletops.timestamp); |
| 1195 | } |
| 1196 | |
| 1197 | strip_info->pps_timer = jiffies; |
| 1198 | strip_info->rx_pps_count = 0; |
| 1199 | strip_info->tx_pps_count = 0; |
| 1200 | strip_info->sx_pps_count = 0; |
| 1201 | strip_info->rx_average_pps = 0; |
| 1202 | strip_info->tx_average_pps = 0; |
| 1203 | strip_info->sx_average_pps = 0; |
| 1204 | |
| 1205 | /* Mark radio address as unknown */ |
| 1206 | *(MetricomAddress *) & strip_info->true_dev_addr = zero_address; |
| 1207 | if (!strip_info->manual_dev_addr) |
| 1208 | *(MetricomAddress *) strip_info->dev->dev_addr = |
| 1209 | zero_address; |
| 1210 | strip_info->working = FALSE; |
| 1211 | strip_info->firmware_level = NoStructure; |
| 1212 | strip_info->next_command = CompatibilityCommand; |
| 1213 | strip_info->watchdog_doprobe = jiffies + 10 * HZ; |
| 1214 | strip_info->watchdog_doreset = jiffies + 1 * HZ; |
| 1215 | |
| 1216 | /* If the user has selected a baud rate above 38.4 see what magic we have to do */ |
| 1217 | if (strip_info->user_baud > B38400) { |
| 1218 | /* |
| 1219 | * Subtle stuff: Pay attention :-) |
| 1220 | * If the serial port is currently at the user's selected (>38.4) rate, |
| 1221 | * then we temporarily switch to 19.2 and issue the ATS304 command |
| 1222 | * to tell the radio to switch to the user's selected rate. |
| 1223 | * If the serial port is not currently at that rate, that means we just |
| 1224 | * issued the ATS304 command last time through, so this time we restore |
| 1225 | * the user's selected rate and issue the normal starmode reset string. |
| 1226 | */ |
| 1227 | if (strip_info->user_baud == get_baud(tty)) { |
| 1228 | static const char b0[] = "ate0q1s304=57600\r"; |
| 1229 | static const char b1[] = "ate0q1s304=115200\r"; |
| 1230 | static const StringDescriptor baudstring[2] = |
| 1231 | { {b0, sizeof(b0) - 1} |
| 1232 | , {b1, sizeof(b1) - 1} |
| 1233 | }; |
| 1234 | set_baud(tty, B19200); |
| 1235 | if (strip_info->user_baud == B57600) |
| 1236 | s = baudstring[0]; |
| 1237 | else if (strip_info->user_baud == B115200) |
| 1238 | s = baudstring[1]; |
| 1239 | else |
| 1240 | s = baudstring[1]; /* For now */ |
| 1241 | } else |
| 1242 | set_baud(tty, strip_info->user_baud); |
| 1243 | } |
| 1244 | |
| 1245 | tty->driver->write(tty, s.string, s.length); |
| 1246 | #ifdef EXT_COUNTERS |
| 1247 | strip_info->tx_ebytes += s.length; |
| 1248 | #endif |
| 1249 | } |
| 1250 | |
| 1251 | /* |
| 1252 | * Called by the driver when there's room for more data. If we have |
| 1253 | * more packets to send, we send them here. |
| 1254 | */ |
| 1255 | |
| 1256 | static void strip_write_some_more(struct tty_struct *tty) |
| 1257 | { |
| 1258 | struct strip *strip_info = (struct strip *) tty->disc_data; |
| 1259 | |
| 1260 | /* First make sure we're connected. */ |
| 1261 | if (!strip_info || strip_info->magic != STRIP_MAGIC || |
| 1262 | !netif_running(strip_info->dev)) |
| 1263 | return; |
| 1264 | |
| 1265 | if (strip_info->tx_left > 0) { |
| 1266 | int num_written = |
| 1267 | tty->driver->write(tty, strip_info->tx_head, |
| 1268 | strip_info->tx_left); |
| 1269 | strip_info->tx_left -= num_written; |
| 1270 | strip_info->tx_head += num_written; |
| 1271 | #ifdef EXT_COUNTERS |
| 1272 | strip_info->tx_sbytes += num_written; |
| 1273 | #endif |
| 1274 | } else { /* Else start transmission of another packet */ |
| 1275 | |
| 1276 | tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); |
| 1277 | strip_unlock(strip_info); |
| 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | static __u8 *add_checksum(__u8 * buffer, __u8 * end) |
| 1282 | { |
| 1283 | __u16 sum = 0; |
| 1284 | __u8 *p = buffer; |
| 1285 | while (p < end) |
| 1286 | sum += *p++; |
| 1287 | end[3] = hextable[sum & 0xF]; |
| 1288 | sum >>= 4; |
| 1289 | end[2] = hextable[sum & 0xF]; |
| 1290 | sum >>= 4; |
| 1291 | end[1] = hextable[sum & 0xF]; |
| 1292 | sum >>= 4; |
| 1293 | end[0] = hextable[sum & 0xF]; |
| 1294 | return (end + 4); |
| 1295 | } |
| 1296 | |
| 1297 | static unsigned char *strip_make_packet(unsigned char *buffer, |
| 1298 | struct strip *strip_info, |
| 1299 | struct sk_buff *skb) |
| 1300 | { |
| 1301 | __u8 *ptr = buffer; |
| 1302 | __u8 *stuffstate = NULL; |
| 1303 | STRIP_Header *header = (STRIP_Header *) skb->data; |
| 1304 | MetricomAddress haddr = header->dst_addr; |
| 1305 | int len = skb->len - sizeof(STRIP_Header); |
| 1306 | MetricomKey key; |
| 1307 | |
| 1308 | /*HexDump("strip_make_packet", strip_info, skb->data, skb->data + skb->len); */ |
| 1309 | |
| 1310 | if (header->protocol == htons(ETH_P_IP)) |
| 1311 | key = SIP0Key; |
| 1312 | else if (header->protocol == htons(ETH_P_ARP)) |
| 1313 | key = ARP0Key; |
| 1314 | else { |
| 1315 | printk(KERN_ERR |
| 1316 | "%s: strip_make_packet: Unknown packet type 0x%04X\n", |
| 1317 | strip_info->dev->name, ntohs(header->protocol)); |
| 1318 | return (NULL); |
| 1319 | } |
| 1320 | |
| 1321 | if (len > strip_info->mtu) { |
| 1322 | printk(KERN_ERR |
| 1323 | "%s: Dropping oversized transmit packet: %d bytes\n", |
| 1324 | strip_info->dev->name, len); |
| 1325 | return (NULL); |
| 1326 | } |
| 1327 | |
| 1328 | /* |
| 1329 | * If we're sending to ourselves, discard the packet. |
| 1330 | * (Metricom radios choke if they try to send a packet to their own address.) |
| 1331 | */ |
| 1332 | if (!memcmp(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) { |
| 1333 | printk(KERN_ERR "%s: Dropping packet addressed to self\n", |
| 1334 | strip_info->dev->name); |
| 1335 | return (NULL); |
| 1336 | } |
| 1337 | |
| 1338 | /* |
| 1339 | * If this is a broadcast packet, send it to our designated Metricom |
| 1340 | * 'broadcast hub' radio (First byte of address being 0xFF means broadcast) |
| 1341 | */ |
| 1342 | if (haddr.c[0] == 0xFF) { |
| 1343 | u32 brd = 0; |
| 1344 | struct in_device *in_dev; |
| 1345 | |
| 1346 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1347 | in_dev = __in_dev_get_rcu(strip_info->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | if (in_dev == NULL) { |
| 1349 | rcu_read_unlock(); |
| 1350 | return NULL; |
| 1351 | } |
| 1352 | if (in_dev->ifa_list) |
| 1353 | brd = in_dev->ifa_list->ifa_broadcast; |
| 1354 | rcu_read_unlock(); |
| 1355 | |
| 1356 | /* arp_query returns 1 if it succeeds in looking up the address, 0 if it fails */ |
| 1357 | if (!arp_query(haddr.c, brd, strip_info->dev)) { |
| 1358 | printk(KERN_ERR |
| 1359 | "%s: Unable to send packet (no broadcast hub configured)\n", |
| 1360 | strip_info->dev->name); |
| 1361 | return (NULL); |
| 1362 | } |
| 1363 | /* |
| 1364 | * If we are the broadcast hub, don't bother sending to ourselves. |
| 1365 | * (Metricom radios choke if they try to send a packet to their own address.) |
| 1366 | */ |
| 1367 | if (!memcmp |
| 1368 | (haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) |
| 1369 | return (NULL); |
| 1370 | } |
| 1371 | |
| 1372 | *ptr++ = 0x0D; |
| 1373 | *ptr++ = '*'; |
| 1374 | *ptr++ = hextable[haddr.c[2] >> 4]; |
| 1375 | *ptr++ = hextable[haddr.c[2] & 0xF]; |
| 1376 | *ptr++ = hextable[haddr.c[3] >> 4]; |
| 1377 | *ptr++ = hextable[haddr.c[3] & 0xF]; |
| 1378 | *ptr++ = '-'; |
| 1379 | *ptr++ = hextable[haddr.c[4] >> 4]; |
| 1380 | *ptr++ = hextable[haddr.c[4] & 0xF]; |
| 1381 | *ptr++ = hextable[haddr.c[5] >> 4]; |
| 1382 | *ptr++ = hextable[haddr.c[5] & 0xF]; |
| 1383 | *ptr++ = '*'; |
| 1384 | *ptr++ = key.c[0]; |
| 1385 | *ptr++ = key.c[1]; |
| 1386 | *ptr++ = key.c[2]; |
| 1387 | *ptr++ = key.c[3]; |
| 1388 | |
| 1389 | ptr = |
| 1390 | StuffData(skb->data + sizeof(STRIP_Header), len, ptr, |
| 1391 | &stuffstate); |
| 1392 | |
| 1393 | if (strip_info->firmware_level >= ChecksummedMessages) |
| 1394 | ptr = add_checksum(buffer + 1, ptr); |
| 1395 | |
| 1396 | *ptr++ = 0x0D; |
| 1397 | return (ptr); |
| 1398 | } |
| 1399 | |
| 1400 | static void strip_send(struct strip *strip_info, struct sk_buff *skb) |
| 1401 | { |
| 1402 | MetricomAddress haddr; |
| 1403 | unsigned char *ptr = strip_info->tx_buff; |
| 1404 | int doreset = (long) jiffies - strip_info->watchdog_doreset >= 0; |
| 1405 | int doprobe = (long) jiffies - strip_info->watchdog_doprobe >= 0 |
| 1406 | && !doreset; |
| 1407 | u32 addr, brd; |
| 1408 | |
| 1409 | /* |
| 1410 | * 1. If we have a packet, encapsulate it and put it in the buffer |
| 1411 | */ |
| 1412 | if (skb) { |
| 1413 | char *newptr = strip_make_packet(ptr, strip_info, skb); |
| 1414 | strip_info->tx_pps_count++; |
| 1415 | if (!newptr) |
| 1416 | strip_info->tx_dropped++; |
| 1417 | else { |
| 1418 | ptr = newptr; |
| 1419 | strip_info->sx_pps_count++; |
| 1420 | strip_info->tx_packets++; /* Count another successful packet */ |
| 1421 | #ifdef EXT_COUNTERS |
| 1422 | strip_info->tx_bytes += skb->len; |
| 1423 | strip_info->tx_rbytes += ptr - strip_info->tx_buff; |
| 1424 | #endif |
| 1425 | /*DumpData("Sending:", strip_info, strip_info->tx_buff, ptr); */ |
| 1426 | /*HexDump("Sending", strip_info, strip_info->tx_buff, ptr); */ |
| 1427 | } |
| 1428 | } |
| 1429 | |
| 1430 | /* |
| 1431 | * 2. If it is time for another tickle, tack it on, after the packet |
| 1432 | */ |
| 1433 | if (doprobe) { |
| 1434 | StringDescriptor ts = CommandString[strip_info->next_command]; |
| 1435 | #if TICKLE_TIMERS |
| 1436 | { |
| 1437 | struct timeval tv; |
| 1438 | do_gettimeofday(&tv); |
| 1439 | printk(KERN_INFO "**** Sending tickle string %d at %02d.%06d\n", |
| 1440 | strip_info->next_command, tv.tv_sec % 100, |
| 1441 | tv.tv_usec); |
| 1442 | } |
| 1443 | #endif |
| 1444 | if (ptr == strip_info->tx_buff) |
| 1445 | *ptr++ = 0x0D; |
| 1446 | |
| 1447 | *ptr++ = '*'; /* First send "**" to provoke an error message */ |
| 1448 | *ptr++ = '*'; |
| 1449 | |
| 1450 | /* Then add the command */ |
| 1451 | memcpy(ptr, ts.string, ts.length); |
| 1452 | |
| 1453 | /* Add a checksum ? */ |
| 1454 | if (strip_info->firmware_level < ChecksummedMessages) |
| 1455 | ptr += ts.length; |
| 1456 | else |
| 1457 | ptr = add_checksum(ptr, ptr + ts.length); |
| 1458 | |
| 1459 | *ptr++ = 0x0D; /* Terminate the command with a <CR> */ |
| 1460 | |
| 1461 | /* Cycle to next periodic command? */ |
| 1462 | if (strip_info->firmware_level >= StructuredMessages) |
| 1463 | if (++strip_info->next_command >= |
| 1464 | ARRAY_SIZE(CommandString)) |
| 1465 | strip_info->next_command = 0; |
| 1466 | #ifdef EXT_COUNTERS |
| 1467 | strip_info->tx_ebytes += ts.length; |
| 1468 | #endif |
| 1469 | strip_info->watchdog_doprobe = jiffies + 10 * HZ; |
| 1470 | strip_info->watchdog_doreset = jiffies + 1 * HZ; |
| 1471 | /*printk(KERN_INFO "%s: Routine radio test.\n", strip_info->dev->name); */ |
| 1472 | } |
| 1473 | |
| 1474 | /* |
| 1475 | * 3. Set up the strip_info ready to send the data (if any). |
| 1476 | */ |
| 1477 | strip_info->tx_head = strip_info->tx_buff; |
| 1478 | strip_info->tx_left = ptr - strip_info->tx_buff; |
| 1479 | strip_info->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); |
| 1480 | |
| 1481 | /* |
| 1482 | * 4. Debugging check to make sure we're not overflowing the buffer. |
| 1483 | */ |
| 1484 | if (strip_info->tx_size - strip_info->tx_left < 20) |
| 1485 | printk(KERN_ERR "%s: Sending%5d bytes;%5d bytes free.\n", |
| 1486 | strip_info->dev->name, strip_info->tx_left, |
| 1487 | strip_info->tx_size - strip_info->tx_left); |
| 1488 | |
| 1489 | /* |
| 1490 | * 5. If watchdog has expired, reset the radio. Note: if there's data waiting in |
| 1491 | * the buffer, strip_write_some_more will send it after the reset has finished |
| 1492 | */ |
| 1493 | if (doreset) { |
| 1494 | ResetRadio(strip_info); |
| 1495 | return; |
| 1496 | } |
| 1497 | |
| 1498 | if (1) { |
| 1499 | struct in_device *in_dev; |
| 1500 | |
| 1501 | brd = addr = 0; |
| 1502 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1503 | in_dev = __in_dev_get_rcu(strip_info->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | if (in_dev) { |
| 1505 | if (in_dev->ifa_list) { |
| 1506 | brd = in_dev->ifa_list->ifa_broadcast; |
| 1507 | addr = in_dev->ifa_list->ifa_local; |
| 1508 | } |
| 1509 | } |
| 1510 | rcu_read_unlock(); |
| 1511 | } |
| 1512 | |
| 1513 | |
| 1514 | /* |
| 1515 | * 6. If it is time for a periodic ARP, queue one up to be sent. |
| 1516 | * We only do this if: |
| 1517 | * 1. The radio is working |
| 1518 | * 2. It's time to send another periodic ARP |
| 1519 | * 3. We really know what our address is (and it is not manually set to zero) |
| 1520 | * 4. We have a designated broadcast address configured |
| 1521 | * If we queue up an ARP packet when we don't have a designated broadcast |
| 1522 | * address configured, then the packet will just have to be discarded in |
| 1523 | * strip_make_packet. This is not fatal, but it causes misleading information |
| 1524 | * to be displayed in tcpdump. tcpdump will report that periodic APRs are |
| 1525 | * being sent, when in fact they are not, because they are all being dropped |
| 1526 | * in the strip_make_packet routine. |
| 1527 | */ |
| 1528 | if (strip_info->working |
| 1529 | && (long) jiffies - strip_info->gratuitous_arp >= 0 |
| 1530 | && memcmp(strip_info->dev->dev_addr, zero_address.c, |
| 1531 | sizeof(zero_address)) |
| 1532 | && arp_query(haddr.c, brd, strip_info->dev)) { |
| 1533 | /*printk(KERN_INFO "%s: Sending gratuitous ARP with interval %ld\n", |
| 1534 | strip_info->dev->name, strip_info->arp_interval / HZ); */ |
| 1535 | strip_info->gratuitous_arp = |
| 1536 | jiffies + strip_info->arp_interval; |
| 1537 | strip_info->arp_interval *= 2; |
| 1538 | if (strip_info->arp_interval > MaxARPInterval) |
| 1539 | strip_info->arp_interval = MaxARPInterval; |
| 1540 | if (addr) |
| 1541 | arp_send(ARPOP_REPLY, ETH_P_ARP, addr, /* Target address of ARP packet is our address */ |
| 1542 | strip_info->dev, /* Device to send packet on */ |
| 1543 | addr, /* Source IP address this ARP packet comes from */ |
| 1544 | NULL, /* Destination HW address is NULL (broadcast it) */ |
| 1545 | strip_info->dev->dev_addr, /* Source HW address is our HW address */ |
| 1546 | strip_info->dev->dev_addr); /* Target HW address is our HW address (redundant) */ |
| 1547 | } |
| 1548 | |
| 1549 | /* |
| 1550 | * 7. All ready. Start the transmission |
| 1551 | */ |
| 1552 | strip_write_some_more(strip_info->tty); |
| 1553 | } |
| 1554 | |
| 1555 | /* Encapsulate a datagram and kick it into a TTY queue. */ |
| 1556 | static int strip_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1557 | { |
| 1558 | struct strip *strip_info = netdev_priv(dev); |
| 1559 | |
| 1560 | if (!netif_running(dev)) { |
| 1561 | printk(KERN_ERR "%s: xmit call when iface is down\n", |
| 1562 | dev->name); |
| 1563 | return (1); |
| 1564 | } |
| 1565 | |
| 1566 | netif_stop_queue(dev); |
| 1567 | |
| 1568 | del_timer(&strip_info->idle_timer); |
| 1569 | |
| 1570 | |
Marcelo Feitoza Parisi | ff5688a | 2006-01-09 18:37:15 -0800 | [diff] [blame] | 1571 | if (time_after(jiffies, strip_info->pps_timer + HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | unsigned long t = jiffies - strip_info->pps_timer; |
| 1573 | unsigned long rx_pps_count = (strip_info->rx_pps_count * HZ * 8 + t / 2) / t; |
| 1574 | unsigned long tx_pps_count = (strip_info->tx_pps_count * HZ * 8 + t / 2) / t; |
| 1575 | unsigned long sx_pps_count = (strip_info->sx_pps_count * HZ * 8 + t / 2) / t; |
| 1576 | |
| 1577 | strip_info->pps_timer = jiffies; |
| 1578 | strip_info->rx_pps_count = 0; |
| 1579 | strip_info->tx_pps_count = 0; |
| 1580 | strip_info->sx_pps_count = 0; |
| 1581 | |
| 1582 | strip_info->rx_average_pps = (strip_info->rx_average_pps + rx_pps_count + 1) / 2; |
| 1583 | strip_info->tx_average_pps = (strip_info->tx_average_pps + tx_pps_count + 1) / 2; |
| 1584 | strip_info->sx_average_pps = (strip_info->sx_average_pps + sx_pps_count + 1) / 2; |
| 1585 | |
| 1586 | if (rx_pps_count / 8 >= 10) |
| 1587 | printk(KERN_INFO "%s: WARNING: Receiving %ld packets per second.\n", |
| 1588 | strip_info->dev->name, rx_pps_count / 8); |
| 1589 | if (tx_pps_count / 8 >= 10) |
| 1590 | printk(KERN_INFO "%s: WARNING: Tx %ld packets per second.\n", |
| 1591 | strip_info->dev->name, tx_pps_count / 8); |
| 1592 | if (sx_pps_count / 8 >= 10) |
| 1593 | printk(KERN_INFO "%s: WARNING: Sending %ld packets per second.\n", |
| 1594 | strip_info->dev->name, sx_pps_count / 8); |
| 1595 | } |
| 1596 | |
| 1597 | spin_lock_bh(&strip_lock); |
| 1598 | |
| 1599 | strip_send(strip_info, skb); |
| 1600 | |
| 1601 | spin_unlock_bh(&strip_lock); |
| 1602 | |
| 1603 | if (skb) |
| 1604 | dev_kfree_skb(skb); |
| 1605 | return 0; |
| 1606 | } |
| 1607 | |
| 1608 | /* |
| 1609 | * IdleTask periodically calls strip_xmit, so even when we have no IP packets |
| 1610 | * to send for an extended period of time, the watchdog processing still gets |
| 1611 | * done to ensure that the radio stays in Starmode |
| 1612 | */ |
| 1613 | |
| 1614 | static void strip_IdleTask(unsigned long parameter) |
| 1615 | { |
| 1616 | strip_xmit(NULL, (struct net_device *) parameter); |
| 1617 | } |
| 1618 | |
| 1619 | /* |
| 1620 | * Create the MAC header for an arbitrary protocol layer |
| 1621 | * |
| 1622 | * saddr!=NULL means use this specific address (n/a for Metricom) |
| 1623 | * saddr==NULL means use default device source address |
| 1624 | * daddr!=NULL means use this destination address |
| 1625 | * daddr==NULL means leave destination address alone |
| 1626 | * (e.g. unresolved arp -- kernel will call |
| 1627 | * rebuild_header later to fill in the address) |
| 1628 | */ |
| 1629 | |
| 1630 | static int strip_header(struct sk_buff *skb, struct net_device *dev, |
| 1631 | unsigned short type, void *daddr, void *saddr, |
| 1632 | unsigned len) |
| 1633 | { |
| 1634 | struct strip *strip_info = netdev_priv(dev); |
| 1635 | STRIP_Header *header = (STRIP_Header *) skb_push(skb, sizeof(STRIP_Header)); |
| 1636 | |
| 1637 | /*printk(KERN_INFO "%s: strip_header 0x%04X %s\n", dev->name, type, |
| 1638 | type == ETH_P_IP ? "IP" : type == ETH_P_ARP ? "ARP" : ""); */ |
| 1639 | |
| 1640 | header->src_addr = strip_info->true_dev_addr; |
| 1641 | header->protocol = htons(type); |
| 1642 | |
| 1643 | /*HexDump("strip_header", netdev_priv(dev), skb->data, skb->data + skb->len); */ |
| 1644 | |
| 1645 | if (!daddr) |
| 1646 | return (-dev->hard_header_len); |
| 1647 | |
| 1648 | header->dst_addr = *(MetricomAddress *) daddr; |
| 1649 | return (dev->hard_header_len); |
| 1650 | } |
| 1651 | |
| 1652 | /* |
| 1653 | * Rebuild the MAC header. This is called after an ARP |
| 1654 | * (or in future other address resolution) has completed on this |
| 1655 | * sk_buff. We now let ARP fill in the other fields. |
| 1656 | * I think this should return zero if packet is ready to send, |
| 1657 | * or non-zero if it needs more time to do an address lookup |
| 1658 | */ |
| 1659 | |
| 1660 | static int strip_rebuild_header(struct sk_buff *skb) |
| 1661 | { |
| 1662 | #ifdef CONFIG_INET |
| 1663 | STRIP_Header *header = (STRIP_Header *) skb->data; |
| 1664 | |
| 1665 | /* Arp find returns zero if if knows the address, */ |
| 1666 | /* or if it doesn't know the address it sends an ARP packet and returns non-zero */ |
| 1667 | return arp_find(header->dst_addr.c, skb) ? 1 : 0; |
| 1668 | #else |
| 1669 | return 0; |
| 1670 | #endif |
| 1671 | } |
| 1672 | |
| 1673 | |
| 1674 | /************************************************************************/ |
| 1675 | /* Receiving routines */ |
| 1676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | /* |
| 1678 | * This function parses the response to the ATS300? command, |
| 1679 | * extracting the radio version and serial number. |
| 1680 | */ |
| 1681 | static void get_radio_version(struct strip *strip_info, __u8 * ptr, __u8 * end) |
| 1682 | { |
| 1683 | __u8 *p, *value_begin, *value_end; |
| 1684 | int len; |
| 1685 | |
| 1686 | /* Determine the beginning of the second line of the payload */ |
| 1687 | p = ptr; |
| 1688 | while (p < end && *p != 10) |
| 1689 | p++; |
| 1690 | if (p >= end) |
| 1691 | return; |
| 1692 | p++; |
| 1693 | value_begin = p; |
| 1694 | |
| 1695 | /* Determine the end of line */ |
| 1696 | while (p < end && *p != 10) |
| 1697 | p++; |
| 1698 | if (p >= end) |
| 1699 | return; |
| 1700 | value_end = p; |
| 1701 | p++; |
| 1702 | |
| 1703 | len = value_end - value_begin; |
| 1704 | len = min_t(int, len, sizeof(FirmwareVersion) - 1); |
| 1705 | if (strip_info->firmware_version.c[0] == 0) |
| 1706 | printk(KERN_INFO "%s: Radio Firmware: %.*s\n", |
| 1707 | strip_info->dev->name, len, value_begin); |
| 1708 | sprintf(strip_info->firmware_version.c, "%.*s", len, value_begin); |
| 1709 | |
| 1710 | /* Look for the first colon */ |
| 1711 | while (p < end && *p != ':') |
| 1712 | p++; |
| 1713 | if (p >= end) |
| 1714 | return; |
| 1715 | /* Skip over the space */ |
| 1716 | p += 2; |
| 1717 | len = sizeof(SerialNumber) - 1; |
| 1718 | if (p + len <= end) { |
| 1719 | sprintf(strip_info->serial_number.c, "%.*s", len, p); |
| 1720 | } else { |
| 1721 | printk(KERN_DEBUG |
| 1722 | "STRIP: radio serial number shorter (%zd) than expected (%d)\n", |
| 1723 | end - p, len); |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | /* |
| 1728 | * This function parses the response to the ATS325? command, |
| 1729 | * extracting the radio battery voltage. |
| 1730 | */ |
| 1731 | static void get_radio_voltage(struct strip *strip_info, __u8 * ptr, __u8 * end) |
| 1732 | { |
| 1733 | int len; |
| 1734 | |
| 1735 | len = sizeof(BatteryVoltage) - 1; |
| 1736 | if (ptr + len <= end) { |
| 1737 | sprintf(strip_info->battery_voltage.c, "%.*s", len, ptr); |
| 1738 | } else { |
| 1739 | printk(KERN_DEBUG |
| 1740 | "STRIP: radio voltage string shorter (%zd) than expected (%d)\n", |
| 1741 | end - ptr, len); |
| 1742 | } |
| 1743 | } |
| 1744 | |
| 1745 | /* |
| 1746 | * This function parses the responses to the AT~LA and ATS311 commands, |
| 1747 | * which list the radio's neighbours. |
| 1748 | */ |
| 1749 | static void get_radio_neighbours(MetricomNodeTable * table, __u8 * ptr, __u8 * end) |
| 1750 | { |
| 1751 | table->num_nodes = 0; |
| 1752 | while (ptr < end && table->num_nodes < NODE_TABLE_SIZE) { |
| 1753 | MetricomNode *node = &table->node[table->num_nodes++]; |
| 1754 | char *dst = node->c, *limit = dst + sizeof(*node) - 1; |
| 1755 | while (ptr < end && *ptr <= 32) |
| 1756 | ptr++; |
| 1757 | while (ptr < end && dst < limit && *ptr != 10) |
| 1758 | *dst++ = *ptr++; |
| 1759 | *dst++ = 0; |
| 1760 | while (ptr < end && ptr[-1] != 10) |
| 1761 | ptr++; |
| 1762 | } |
| 1763 | do_gettimeofday(&table->timestamp); |
| 1764 | } |
| 1765 | |
| 1766 | static int get_radio_address(struct strip *strip_info, __u8 * p) |
| 1767 | { |
| 1768 | MetricomAddress addr; |
| 1769 | |
| 1770 | if (string_to_radio_address(&addr, p)) |
| 1771 | return (1); |
| 1772 | |
| 1773 | /* See if our radio address has changed */ |
| 1774 | if (memcmp(strip_info->true_dev_addr.c, addr.c, sizeof(addr))) { |
| 1775 | MetricomAddressString addr_string; |
| 1776 | radio_address_to_string(&addr, &addr_string); |
| 1777 | printk(KERN_INFO "%s: Radio address = %s\n", |
| 1778 | strip_info->dev->name, addr_string.c); |
| 1779 | strip_info->true_dev_addr = addr; |
| 1780 | if (!strip_info->manual_dev_addr) |
| 1781 | *(MetricomAddress *) strip_info->dev->dev_addr = |
| 1782 | addr; |
| 1783 | /* Give the radio a few seconds to get its head straight, then send an arp */ |
| 1784 | strip_info->gratuitous_arp = jiffies + 15 * HZ; |
| 1785 | strip_info->arp_interval = 1 * HZ; |
| 1786 | } |
| 1787 | return (0); |
| 1788 | } |
| 1789 | |
| 1790 | static int verify_checksum(struct strip *strip_info) |
| 1791 | { |
| 1792 | __u8 *p = strip_info->sx_buff; |
| 1793 | __u8 *end = strip_info->sx_buff + strip_info->sx_count - 4; |
| 1794 | u_short sum = |
| 1795 | (READHEX16(end[0]) << 12) | (READHEX16(end[1]) << 8) | |
| 1796 | (READHEX16(end[2]) << 4) | (READHEX16(end[3])); |
| 1797 | while (p < end) |
| 1798 | sum -= *p++; |
| 1799 | if (sum == 0 && strip_info->firmware_level == StructuredMessages) { |
| 1800 | strip_info->firmware_level = ChecksummedMessages; |
| 1801 | printk(KERN_INFO "%s: Radio provides message checksums\n", |
| 1802 | strip_info->dev->name); |
| 1803 | } |
| 1804 | return (sum == 0); |
| 1805 | } |
| 1806 | |
| 1807 | static void RecvErr(char *msg, struct strip *strip_info) |
| 1808 | { |
| 1809 | __u8 *ptr = strip_info->sx_buff; |
| 1810 | __u8 *end = strip_info->sx_buff + strip_info->sx_count; |
| 1811 | DumpData(msg, strip_info, ptr, end); |
| 1812 | strip_info->rx_errors++; |
| 1813 | } |
| 1814 | |
| 1815 | static void RecvErr_Message(struct strip *strip_info, __u8 * sendername, |
| 1816 | const __u8 * msg, u_long len) |
| 1817 | { |
| 1818 | if (has_prefix(msg, len, "001")) { /* Not in StarMode! */ |
| 1819 | RecvErr("Error Msg:", strip_info); |
| 1820 | printk(KERN_INFO "%s: Radio %s is not in StarMode\n", |
| 1821 | strip_info->dev->name, sendername); |
| 1822 | } |
| 1823 | |
| 1824 | else if (has_prefix(msg, len, "002")) { /* Remap handle */ |
| 1825 | /* We ignore "Remap handle" messages for now */ |
| 1826 | } |
| 1827 | |
| 1828 | else if (has_prefix(msg, len, "003")) { /* Can't resolve name */ |
| 1829 | RecvErr("Error Msg:", strip_info); |
| 1830 | printk(KERN_INFO "%s: Destination radio name is unknown\n", |
| 1831 | strip_info->dev->name); |
| 1832 | } |
| 1833 | |
| 1834 | else if (has_prefix(msg, len, "004")) { /* Name too small or missing */ |
| 1835 | strip_info->watchdog_doreset = jiffies + LongTime; |
| 1836 | #if TICKLE_TIMERS |
| 1837 | { |
| 1838 | struct timeval tv; |
| 1839 | do_gettimeofday(&tv); |
| 1840 | printk(KERN_INFO |
| 1841 | "**** Got ERR_004 response at %02d.%06d\n", |
| 1842 | tv.tv_sec % 100, tv.tv_usec); |
| 1843 | } |
| 1844 | #endif |
| 1845 | if (!strip_info->working) { |
| 1846 | strip_info->working = TRUE; |
| 1847 | printk(KERN_INFO "%s: Radio now in starmode\n", |
| 1848 | strip_info->dev->name); |
| 1849 | /* |
| 1850 | * If the radio has just entered a working state, we should do our first |
| 1851 | * probe ASAP, so that we find out our radio address etc. without delay. |
| 1852 | */ |
| 1853 | strip_info->watchdog_doprobe = jiffies; |
| 1854 | } |
| 1855 | if (strip_info->firmware_level == NoStructure && sendername) { |
| 1856 | strip_info->firmware_level = StructuredMessages; |
| 1857 | strip_info->next_command = 0; /* Try to enable checksums ASAP */ |
| 1858 | printk(KERN_INFO |
| 1859 | "%s: Radio provides structured messages\n", |
| 1860 | strip_info->dev->name); |
| 1861 | } |
| 1862 | if (strip_info->firmware_level >= StructuredMessages) { |
| 1863 | /* |
| 1864 | * If this message has a valid checksum on the end, then the call to verify_checksum |
| 1865 | * will elevate the firmware_level to ChecksummedMessages for us. (The actual return |
| 1866 | * code from verify_checksum is ignored here.) |
| 1867 | */ |
| 1868 | verify_checksum(strip_info); |
| 1869 | /* |
| 1870 | * If the radio has structured messages but we don't yet have all our information about it, |
| 1871 | * we should do probes without delay, until we have gathered all the information |
| 1872 | */ |
| 1873 | if (!GOT_ALL_RADIO_INFO(strip_info)) |
| 1874 | strip_info->watchdog_doprobe = jiffies; |
| 1875 | } |
| 1876 | } |
| 1877 | |
| 1878 | else if (has_prefix(msg, len, "005")) /* Bad count specification */ |
| 1879 | RecvErr("Error Msg:", strip_info); |
| 1880 | |
| 1881 | else if (has_prefix(msg, len, "006")) /* Header too big */ |
| 1882 | RecvErr("Error Msg:", strip_info); |
| 1883 | |
| 1884 | else if (has_prefix(msg, len, "007")) { /* Body too big */ |
| 1885 | RecvErr("Error Msg:", strip_info); |
| 1886 | printk(KERN_ERR |
| 1887 | "%s: Error! Packet size too big for radio.\n", |
| 1888 | strip_info->dev->name); |
| 1889 | } |
| 1890 | |
| 1891 | else if (has_prefix(msg, len, "008")) { /* Bad character in name */ |
| 1892 | RecvErr("Error Msg:", strip_info); |
| 1893 | printk(KERN_ERR |
| 1894 | "%s: Radio name contains illegal character\n", |
| 1895 | strip_info->dev->name); |
| 1896 | } |
| 1897 | |
| 1898 | else if (has_prefix(msg, len, "009")) /* No count or line terminator */ |
| 1899 | RecvErr("Error Msg:", strip_info); |
| 1900 | |
| 1901 | else if (has_prefix(msg, len, "010")) /* Invalid checksum */ |
| 1902 | RecvErr("Error Msg:", strip_info); |
| 1903 | |
| 1904 | else if (has_prefix(msg, len, "011")) /* Checksum didn't match */ |
| 1905 | RecvErr("Error Msg:", strip_info); |
| 1906 | |
| 1907 | else if (has_prefix(msg, len, "012")) /* Failed to transmit packet */ |
| 1908 | RecvErr("Error Msg:", strip_info); |
| 1909 | |
| 1910 | else |
| 1911 | RecvErr("Error Msg:", strip_info); |
| 1912 | } |
| 1913 | |
| 1914 | static void process_AT_response(struct strip *strip_info, __u8 * ptr, |
| 1915 | __u8 * end) |
| 1916 | { |
| 1917 | u_long len; |
| 1918 | __u8 *p = ptr; |
| 1919 | while (p < end && p[-1] != 10) |
| 1920 | p++; /* Skip past first newline character */ |
| 1921 | /* Now ptr points to the AT command, and p points to the text of the response. */ |
| 1922 | len = p - ptr; |
| 1923 | |
| 1924 | #if TICKLE_TIMERS |
| 1925 | { |
| 1926 | struct timeval tv; |
| 1927 | do_gettimeofday(&tv); |
| 1928 | printk(KERN_INFO "**** Got AT response %.7s at %02d.%06d\n", |
| 1929 | ptr, tv.tv_sec % 100, tv.tv_usec); |
| 1930 | } |
| 1931 | #endif |
| 1932 | |
| 1933 | if (has_prefix(ptr, len, "ATS300?")) |
| 1934 | get_radio_version(strip_info, p, end); |
| 1935 | else if (has_prefix(ptr, len, "ATS305?")) |
| 1936 | get_radio_address(strip_info, p); |
| 1937 | else if (has_prefix(ptr, len, "ATS311?")) |
| 1938 | get_radio_neighbours(&strip_info->poletops, p, end); |
| 1939 | else if (has_prefix(ptr, len, "ATS319=7")) |
| 1940 | verify_checksum(strip_info); |
| 1941 | else if (has_prefix(ptr, len, "ATS325?")) |
| 1942 | get_radio_voltage(strip_info, p, end); |
| 1943 | else if (has_prefix(ptr, len, "AT~LA")) |
| 1944 | get_radio_neighbours(&strip_info->portables, p, end); |
| 1945 | else |
| 1946 | RecvErr("Unknown AT Response:", strip_info); |
| 1947 | } |
| 1948 | |
| 1949 | static void process_ACK(struct strip *strip_info, __u8 * ptr, __u8 * end) |
| 1950 | { |
| 1951 | /* Currently we don't do anything with ACKs from the radio */ |
| 1952 | } |
| 1953 | |
| 1954 | static void process_Info(struct strip *strip_info, __u8 * ptr, __u8 * end) |
| 1955 | { |
| 1956 | if (ptr + 16 > end) |
| 1957 | RecvErr("Bad Info Msg:", strip_info); |
| 1958 | } |
| 1959 | |
| 1960 | static struct net_device *get_strip_dev(struct strip *strip_info) |
| 1961 | { |
| 1962 | /* If our hardware address is *manually set* to zero, and we know our */ |
| 1963 | /* real radio hardware address, try to find another strip device that has been */ |
| 1964 | /* manually set to that address that we can 'transfer ownership' of this packet to */ |
| 1965 | if (strip_info->manual_dev_addr && |
| 1966 | !memcmp(strip_info->dev->dev_addr, zero_address.c, |
| 1967 | sizeof(zero_address)) |
| 1968 | && memcmp(&strip_info->true_dev_addr, zero_address.c, |
| 1969 | sizeof(zero_address))) { |
| 1970 | struct net_device *dev; |
| 1971 | read_lock_bh(&dev_base_lock); |
| 1972 | dev = dev_base; |
| 1973 | while (dev) { |
| 1974 | if (dev->type == strip_info->dev->type && |
| 1975 | !memcmp(dev->dev_addr, |
| 1976 | &strip_info->true_dev_addr, |
| 1977 | sizeof(MetricomAddress))) { |
| 1978 | printk(KERN_INFO |
| 1979 | "%s: Transferred packet ownership to %s.\n", |
| 1980 | strip_info->dev->name, dev->name); |
| 1981 | read_unlock_bh(&dev_base_lock); |
| 1982 | return (dev); |
| 1983 | } |
| 1984 | dev = dev->next; |
| 1985 | } |
| 1986 | read_unlock_bh(&dev_base_lock); |
| 1987 | } |
| 1988 | return (strip_info->dev); |
| 1989 | } |
| 1990 | |
| 1991 | /* |
| 1992 | * Send one completely decapsulated datagram to the next layer. |
| 1993 | */ |
| 1994 | |
| 1995 | static void deliver_packet(struct strip *strip_info, STRIP_Header * header, |
| 1996 | __u16 packetlen) |
| 1997 | { |
| 1998 | struct sk_buff *skb = dev_alloc_skb(sizeof(STRIP_Header) + packetlen); |
| 1999 | if (!skb) { |
| 2000 | printk(KERN_ERR "%s: memory squeeze, dropping packet.\n", |
| 2001 | strip_info->dev->name); |
| 2002 | strip_info->rx_dropped++; |
| 2003 | } else { |
| 2004 | memcpy(skb_put(skb, sizeof(STRIP_Header)), header, |
| 2005 | sizeof(STRIP_Header)); |
| 2006 | memcpy(skb_put(skb, packetlen), strip_info->rx_buff, |
| 2007 | packetlen); |
| 2008 | skb->dev = get_strip_dev(strip_info); |
| 2009 | skb->protocol = header->protocol; |
| 2010 | skb->mac.raw = skb->data; |
| 2011 | |
| 2012 | /* Having put a fake header on the front of the sk_buff for the */ |
| 2013 | /* benefit of tools like tcpdump, skb_pull now 'consumes' that */ |
| 2014 | /* fake header before we hand the packet up to the next layer. */ |
| 2015 | skb_pull(skb, sizeof(STRIP_Header)); |
| 2016 | |
| 2017 | /* Finally, hand the packet up to the next layer (e.g. IP or ARP, etc.) */ |
| 2018 | strip_info->rx_packets++; |
| 2019 | strip_info->rx_pps_count++; |
| 2020 | #ifdef EXT_COUNTERS |
| 2021 | strip_info->rx_bytes += packetlen; |
| 2022 | #endif |
| 2023 | skb->dev->last_rx = jiffies; |
| 2024 | netif_rx(skb); |
| 2025 | } |
| 2026 | } |
| 2027 | |
| 2028 | static void process_IP_packet(struct strip *strip_info, |
| 2029 | STRIP_Header * header, __u8 * ptr, |
| 2030 | __u8 * end) |
| 2031 | { |
| 2032 | __u16 packetlen; |
| 2033 | |
| 2034 | /* Decode start of the IP packet header */ |
| 2035 | ptr = UnStuffData(ptr, end, strip_info->rx_buff, 4); |
| 2036 | if (!ptr) { |
| 2037 | RecvErr("IP Packet too short", strip_info); |
| 2038 | return; |
| 2039 | } |
| 2040 | |
| 2041 | packetlen = ((__u16) strip_info->rx_buff[2] << 8) | strip_info->rx_buff[3]; |
| 2042 | |
| 2043 | if (packetlen > MAX_RECV_MTU) { |
| 2044 | printk(KERN_INFO "%s: Dropping oversized received IP packet: %d bytes\n", |
| 2045 | strip_info->dev->name, packetlen); |
| 2046 | strip_info->rx_dropped++; |
| 2047 | return; |
| 2048 | } |
| 2049 | |
| 2050 | /*printk(KERN_INFO "%s: Got %d byte IP packet\n", strip_info->dev->name, packetlen); */ |
| 2051 | |
| 2052 | /* Decode remainder of the IP packet */ |
| 2053 | ptr = |
| 2054 | UnStuffData(ptr, end, strip_info->rx_buff + 4, packetlen - 4); |
| 2055 | if (!ptr) { |
| 2056 | RecvErr("IP Packet too short", strip_info); |
| 2057 | return; |
| 2058 | } |
| 2059 | |
| 2060 | if (ptr < end) { |
| 2061 | RecvErr("IP Packet too long", strip_info); |
| 2062 | return; |
| 2063 | } |
| 2064 | |
| 2065 | header->protocol = htons(ETH_P_IP); |
| 2066 | |
| 2067 | deliver_packet(strip_info, header, packetlen); |
| 2068 | } |
| 2069 | |
| 2070 | static void process_ARP_packet(struct strip *strip_info, |
| 2071 | STRIP_Header * header, __u8 * ptr, |
| 2072 | __u8 * end) |
| 2073 | { |
| 2074 | __u16 packetlen; |
| 2075 | struct arphdr *arphdr = (struct arphdr *) strip_info->rx_buff; |
| 2076 | |
| 2077 | /* Decode start of the ARP packet */ |
| 2078 | ptr = UnStuffData(ptr, end, strip_info->rx_buff, 8); |
| 2079 | if (!ptr) { |
| 2080 | RecvErr("ARP Packet too short", strip_info); |
| 2081 | return; |
| 2082 | } |
| 2083 | |
| 2084 | packetlen = 8 + (arphdr->ar_hln + arphdr->ar_pln) * 2; |
| 2085 | |
| 2086 | if (packetlen > MAX_RECV_MTU) { |
| 2087 | printk(KERN_INFO |
| 2088 | "%s: Dropping oversized received ARP packet: %d bytes\n", |
| 2089 | strip_info->dev->name, packetlen); |
| 2090 | strip_info->rx_dropped++; |
| 2091 | return; |
| 2092 | } |
| 2093 | |
| 2094 | /*printk(KERN_INFO "%s: Got %d byte ARP %s\n", |
| 2095 | strip_info->dev->name, packetlen, |
| 2096 | ntohs(arphdr->ar_op) == ARPOP_REQUEST ? "request" : "reply"); */ |
| 2097 | |
| 2098 | /* Decode remainder of the ARP packet */ |
| 2099 | ptr = |
| 2100 | UnStuffData(ptr, end, strip_info->rx_buff + 8, packetlen - 8); |
| 2101 | if (!ptr) { |
| 2102 | RecvErr("ARP Packet too short", strip_info); |
| 2103 | return; |
| 2104 | } |
| 2105 | |
| 2106 | if (ptr < end) { |
| 2107 | RecvErr("ARP Packet too long", strip_info); |
| 2108 | return; |
| 2109 | } |
| 2110 | |
| 2111 | header->protocol = htons(ETH_P_ARP); |
| 2112 | |
| 2113 | deliver_packet(strip_info, header, packetlen); |
| 2114 | } |
| 2115 | |
| 2116 | /* |
| 2117 | * process_text_message processes a <CR>-terminated block of data received |
| 2118 | * from the radio that doesn't begin with a '*' character. All normal |
| 2119 | * Starmode communication messages with the radio begin with a '*', |
| 2120 | * so any text that does not indicates a serial port error, a radio that |
| 2121 | * is in Hayes command mode instead of Starmode, or a radio with really |
| 2122 | * old firmware that doesn't frame its Starmode responses properly. |
| 2123 | */ |
| 2124 | static void process_text_message(struct strip *strip_info) |
| 2125 | { |
| 2126 | __u8 *msg = strip_info->sx_buff; |
| 2127 | int len = strip_info->sx_count; |
| 2128 | |
| 2129 | /* Check for anything that looks like it might be our radio name */ |
| 2130 | /* (This is here for backwards compatibility with old firmware) */ |
| 2131 | if (len == 9 && get_radio_address(strip_info, msg) == 0) |
| 2132 | return; |
| 2133 | |
| 2134 | if (text_equal(msg, len, "OK")) |
| 2135 | return; /* Ignore 'OK' responses from prior commands */ |
| 2136 | if (text_equal(msg, len, "ERROR")) |
| 2137 | return; /* Ignore 'ERROR' messages */ |
| 2138 | if (has_prefix(msg, len, "ate0q1")) |
| 2139 | return; /* Ignore character echo back from the radio */ |
| 2140 | |
| 2141 | /* Catch other error messages */ |
| 2142 | /* (This is here for backwards compatibility with old firmware) */ |
| 2143 | if (has_prefix(msg, len, "ERR_")) { |
| 2144 | RecvErr_Message(strip_info, NULL, &msg[4], len - 4); |
| 2145 | return; |
| 2146 | } |
| 2147 | |
| 2148 | RecvErr("No initial *", strip_info); |
| 2149 | } |
| 2150 | |
| 2151 | /* |
| 2152 | * process_message processes a <CR>-terminated block of data received |
| 2153 | * from the radio. If the radio is not in Starmode or has old firmware, |
| 2154 | * it may be a line of text in response to an AT command. Ideally, with |
| 2155 | * a current radio that's properly in Starmode, all data received should |
| 2156 | * be properly framed and checksummed radio message blocks, containing |
| 2157 | * either a starmode packet, or a other communication from the radio |
| 2158 | * firmware, like "INF_" Info messages and &COMMAND responses. |
| 2159 | */ |
| 2160 | static void process_message(struct strip *strip_info) |
| 2161 | { |
| 2162 | STRIP_Header header = { zero_address, zero_address, 0 }; |
| 2163 | __u8 *ptr = strip_info->sx_buff; |
| 2164 | __u8 *end = strip_info->sx_buff + strip_info->sx_count; |
| 2165 | __u8 sendername[32], *sptr = sendername; |
| 2166 | MetricomKey key; |
| 2167 | |
| 2168 | /*HexDump("Receiving", strip_info, ptr, end); */ |
| 2169 | |
| 2170 | /* Check for start of address marker, and then skip over it */ |
| 2171 | if (*ptr == '*') |
| 2172 | ptr++; |
| 2173 | else { |
| 2174 | process_text_message(strip_info); |
| 2175 | return; |
| 2176 | } |
| 2177 | |
| 2178 | /* Copy out the return address */ |
| 2179 | while (ptr < end && *ptr != '*' |
| 2180 | && sptr < ARRAY_END(sendername) - 1) |
| 2181 | *sptr++ = *ptr++; |
| 2182 | *sptr = 0; /* Null terminate the sender name */ |
| 2183 | |
| 2184 | /* Check for end of address marker, and skip over it */ |
| 2185 | if (ptr >= end || *ptr != '*') { |
| 2186 | RecvErr("No second *", strip_info); |
| 2187 | return; |
| 2188 | } |
| 2189 | ptr++; /* Skip the second '*' */ |
| 2190 | |
| 2191 | /* If the sender name is "&COMMAND", ignore this 'packet' */ |
| 2192 | /* (This is here for backwards compatibility with old firmware) */ |
| 2193 | if (!strcmp(sendername, "&COMMAND")) { |
| 2194 | strip_info->firmware_level = NoStructure; |
| 2195 | strip_info->next_command = CompatibilityCommand; |
| 2196 | return; |
| 2197 | } |
| 2198 | |
| 2199 | if (ptr + 4 > end) { |
| 2200 | RecvErr("No proto key", strip_info); |
| 2201 | return; |
| 2202 | } |
| 2203 | |
| 2204 | /* Get the protocol key out of the buffer */ |
| 2205 | key.c[0] = *ptr++; |
| 2206 | key.c[1] = *ptr++; |
| 2207 | key.c[2] = *ptr++; |
| 2208 | key.c[3] = *ptr++; |
| 2209 | |
| 2210 | /* If we're using checksums, verify the checksum at the end of the packet */ |
| 2211 | if (strip_info->firmware_level >= ChecksummedMessages) { |
| 2212 | end -= 4; /* Chop the last four bytes off the packet (they're the checksum) */ |
| 2213 | if (ptr > end) { |
| 2214 | RecvErr("Missing Checksum", strip_info); |
| 2215 | return; |
| 2216 | } |
| 2217 | if (!verify_checksum(strip_info)) { |
| 2218 | RecvErr("Bad Checksum", strip_info); |
| 2219 | return; |
| 2220 | } |
| 2221 | } |
| 2222 | |
| 2223 | /*printk(KERN_INFO "%s: Got packet from \"%s\".\n", strip_info->dev->name, sendername); */ |
| 2224 | |
| 2225 | /* |
| 2226 | * Fill in (pseudo) source and destination addresses in the packet. |
| 2227 | * We assume that the destination address was our address (the radio does not |
| 2228 | * tell us this). If the radio supplies a source address, then we use it. |
| 2229 | */ |
| 2230 | header.dst_addr = strip_info->true_dev_addr; |
| 2231 | string_to_radio_address(&header.src_addr, sendername); |
| 2232 | |
| 2233 | #ifdef EXT_COUNTERS |
| 2234 | if (key.l == SIP0Key.l) { |
| 2235 | strip_info->rx_rbytes += (end - ptr); |
| 2236 | process_IP_packet(strip_info, &header, ptr, end); |
| 2237 | } else if (key.l == ARP0Key.l) { |
| 2238 | strip_info->rx_rbytes += (end - ptr); |
| 2239 | process_ARP_packet(strip_info, &header, ptr, end); |
| 2240 | } else if (key.l == ATR_Key.l) { |
| 2241 | strip_info->rx_ebytes += (end - ptr); |
| 2242 | process_AT_response(strip_info, ptr, end); |
| 2243 | } else if (key.l == ACK_Key.l) { |
| 2244 | strip_info->rx_ebytes += (end - ptr); |
| 2245 | process_ACK(strip_info, ptr, end); |
| 2246 | } else if (key.l == INF_Key.l) { |
| 2247 | strip_info->rx_ebytes += (end - ptr); |
| 2248 | process_Info(strip_info, ptr, end); |
| 2249 | } else if (key.l == ERR_Key.l) { |
| 2250 | strip_info->rx_ebytes += (end - ptr); |
| 2251 | RecvErr_Message(strip_info, sendername, ptr, end - ptr); |
| 2252 | } else |
| 2253 | RecvErr("Unrecognized protocol key", strip_info); |
| 2254 | #else |
| 2255 | if (key.l == SIP0Key.l) |
| 2256 | process_IP_packet(strip_info, &header, ptr, end); |
| 2257 | else if (key.l == ARP0Key.l) |
| 2258 | process_ARP_packet(strip_info, &header, ptr, end); |
| 2259 | else if (key.l == ATR_Key.l) |
| 2260 | process_AT_response(strip_info, ptr, end); |
| 2261 | else if (key.l == ACK_Key.l) |
| 2262 | process_ACK(strip_info, ptr, end); |
| 2263 | else if (key.l == INF_Key.l) |
| 2264 | process_Info(strip_info, ptr, end); |
| 2265 | else if (key.l == ERR_Key.l) |
| 2266 | RecvErr_Message(strip_info, sendername, ptr, end - ptr); |
| 2267 | else |
| 2268 | RecvErr("Unrecognized protocol key", strip_info); |
| 2269 | #endif |
| 2270 | } |
| 2271 | |
| 2272 | #define TTYERROR(X) ((X) == TTY_BREAK ? "Break" : \ |
| 2273 | (X) == TTY_FRAME ? "Framing Error" : \ |
| 2274 | (X) == TTY_PARITY ? "Parity Error" : \ |
| 2275 | (X) == TTY_OVERRUN ? "Hardware Overrun" : "Unknown Error") |
| 2276 | |
| 2277 | /* |
| 2278 | * Handle the 'receiver data ready' interrupt. |
| 2279 | * This function is called by the 'tty_io' module in the kernel when |
| 2280 | * a block of STRIP data has been received, which can now be decapsulated |
| 2281 | * and sent on to some IP layer for further processing. |
| 2282 | */ |
| 2283 | |
| 2284 | static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
| 2285 | char *fp, int count) |
| 2286 | { |
| 2287 | struct strip *strip_info = (struct strip *) tty->disc_data; |
| 2288 | const unsigned char *end = cp + count; |
| 2289 | |
| 2290 | if (!strip_info || strip_info->magic != STRIP_MAGIC |
| 2291 | || !netif_running(strip_info->dev)) |
| 2292 | return; |
| 2293 | |
| 2294 | spin_lock_bh(&strip_lock); |
| 2295 | #if 0 |
| 2296 | { |
| 2297 | struct timeval tv; |
| 2298 | do_gettimeofday(&tv); |
| 2299 | printk(KERN_INFO |
| 2300 | "**** strip_receive_buf: %3d bytes at %02d.%06d\n", |
| 2301 | count, tv.tv_sec % 100, tv.tv_usec); |
| 2302 | } |
| 2303 | #endif |
| 2304 | |
| 2305 | #ifdef EXT_COUNTERS |
| 2306 | strip_info->rx_sbytes += count; |
| 2307 | #endif |
| 2308 | |
| 2309 | /* Read the characters out of the buffer */ |
| 2310 | while (cp < end) { |
| 2311 | if (fp && *fp) |
| 2312 | printk(KERN_INFO "%s: %s on serial port\n", |
| 2313 | strip_info->dev->name, TTYERROR(*fp)); |
| 2314 | if (fp && *fp++ && !strip_info->discard) { /* If there's a serial error, record it */ |
| 2315 | /* If we have some characters in the buffer, discard them */ |
| 2316 | strip_info->discard = strip_info->sx_count; |
| 2317 | strip_info->rx_errors++; |
| 2318 | } |
| 2319 | |
| 2320 | /* Leading control characters (CR, NL, Tab, etc.) are ignored */ |
| 2321 | if (strip_info->sx_count > 0 || *cp >= ' ') { |
| 2322 | if (*cp == 0x0D) { /* If end of packet, decide what to do with it */ |
| 2323 | if (strip_info->sx_count > 3000) |
| 2324 | printk(KERN_INFO |
| 2325 | "%s: Cut a %d byte packet (%zd bytes remaining)%s\n", |
| 2326 | strip_info->dev->name, |
| 2327 | strip_info->sx_count, |
| 2328 | end - cp - 1, |
| 2329 | strip_info-> |
| 2330 | discard ? " (discarded)" : |
| 2331 | ""); |
| 2332 | if (strip_info->sx_count > |
| 2333 | strip_info->sx_size) { |
| 2334 | strip_info->rx_over_errors++; |
| 2335 | printk(KERN_INFO |
| 2336 | "%s: sx_buff overflow (%d bytes total)\n", |
| 2337 | strip_info->dev->name, |
| 2338 | strip_info->sx_count); |
| 2339 | } else if (strip_info->discard) |
| 2340 | printk(KERN_INFO |
| 2341 | "%s: Discarding bad packet (%d/%d)\n", |
| 2342 | strip_info->dev->name, |
| 2343 | strip_info->discard, |
| 2344 | strip_info->sx_count); |
| 2345 | else |
| 2346 | process_message(strip_info); |
| 2347 | strip_info->discard = 0; |
| 2348 | strip_info->sx_count = 0; |
| 2349 | } else { |
| 2350 | /* Make sure we have space in the buffer */ |
| 2351 | if (strip_info->sx_count < |
| 2352 | strip_info->sx_size) |
| 2353 | strip_info->sx_buff[strip_info-> |
| 2354 | sx_count] = |
| 2355 | *cp; |
| 2356 | strip_info->sx_count++; |
| 2357 | } |
| 2358 | } |
| 2359 | cp++; |
| 2360 | } |
| 2361 | spin_unlock_bh(&strip_lock); |
| 2362 | } |
| 2363 | |
| 2364 | |
| 2365 | /************************************************************************/ |
| 2366 | /* General control routines */ |
| 2367 | |
| 2368 | static int set_mac_address(struct strip *strip_info, |
| 2369 | MetricomAddress * addr) |
| 2370 | { |
| 2371 | /* |
| 2372 | * We're using a manually specified address if the address is set |
| 2373 | * to anything other than all ones. Setting the address to all ones |
| 2374 | * disables manual mode and goes back to automatic address determination |
| 2375 | * (tracking the true address that the radio has). |
| 2376 | */ |
| 2377 | strip_info->manual_dev_addr = |
| 2378 | memcmp(addr->c, broadcast_address.c, |
| 2379 | sizeof(broadcast_address)); |
| 2380 | if (strip_info->manual_dev_addr) |
| 2381 | *(MetricomAddress *) strip_info->dev->dev_addr = *addr; |
| 2382 | else |
| 2383 | *(MetricomAddress *) strip_info->dev->dev_addr = |
| 2384 | strip_info->true_dev_addr; |
| 2385 | return 0; |
| 2386 | } |
| 2387 | |
| 2388 | static int strip_set_mac_address(struct net_device *dev, void *addr) |
| 2389 | { |
| 2390 | struct strip *strip_info = netdev_priv(dev); |
| 2391 | struct sockaddr *sa = addr; |
| 2392 | printk(KERN_INFO "%s: strip_set_dev_mac_address called\n", dev->name); |
| 2393 | set_mac_address(strip_info, (MetricomAddress *) sa->sa_data); |
| 2394 | return 0; |
| 2395 | } |
| 2396 | |
| 2397 | static struct net_device_stats *strip_get_stats(struct net_device *dev) |
| 2398 | { |
| 2399 | struct strip *strip_info = netdev_priv(dev); |
| 2400 | static struct net_device_stats stats; |
| 2401 | |
| 2402 | memset(&stats, 0, sizeof(struct net_device_stats)); |
| 2403 | |
| 2404 | stats.rx_packets = strip_info->rx_packets; |
| 2405 | stats.tx_packets = strip_info->tx_packets; |
| 2406 | stats.rx_dropped = strip_info->rx_dropped; |
| 2407 | stats.tx_dropped = strip_info->tx_dropped; |
| 2408 | stats.tx_errors = strip_info->tx_errors; |
| 2409 | stats.rx_errors = strip_info->rx_errors; |
| 2410 | stats.rx_over_errors = strip_info->rx_over_errors; |
| 2411 | return (&stats); |
| 2412 | } |
| 2413 | |
| 2414 | |
| 2415 | /************************************************************************/ |
| 2416 | /* Opening and closing */ |
| 2417 | |
| 2418 | /* |
| 2419 | * Here's the order things happen: |
| 2420 | * When the user runs "slattach -p strip ..." |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 2421 | * 1. The TTY module calls strip_open;; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | * 2. strip_open calls strip_alloc |
| 2423 | * 3. strip_alloc calls register_netdev |
| 2424 | * 4. register_netdev calls strip_dev_init |
| 2425 | * 5. then strip_open finishes setting up the strip_info |
| 2426 | * |
| 2427 | * When the user runs "ifconfig st<x> up address netmask ..." |
| 2428 | * 6. strip_open_low gets called |
| 2429 | * |
| 2430 | * When the user runs "ifconfig st<x> down" |
| 2431 | * 7. strip_close_low gets called |
| 2432 | * |
| 2433 | * When the user kills the slattach process |
| 2434 | * 8. strip_close gets called |
| 2435 | * 9. strip_close calls dev_close |
| 2436 | * 10. if the device is still up, then dev_close calls strip_close_low |
| 2437 | * 11. strip_close calls strip_free |
| 2438 | */ |
| 2439 | |
| 2440 | /* Open the low-level part of the STRIP channel. Easy! */ |
| 2441 | |
| 2442 | static int strip_open_low(struct net_device *dev) |
| 2443 | { |
| 2444 | struct strip *strip_info = netdev_priv(dev); |
| 2445 | |
| 2446 | if (strip_info->tty == NULL) |
| 2447 | return (-ENODEV); |
| 2448 | |
| 2449 | if (!allocate_buffers(strip_info, dev->mtu)) |
| 2450 | return (-ENOMEM); |
| 2451 | |
| 2452 | strip_info->sx_count = 0; |
| 2453 | strip_info->tx_left = 0; |
| 2454 | |
| 2455 | strip_info->discard = 0; |
| 2456 | strip_info->working = FALSE; |
| 2457 | strip_info->firmware_level = NoStructure; |
| 2458 | strip_info->next_command = CompatibilityCommand; |
| 2459 | strip_info->user_baud = get_baud(strip_info->tty); |
| 2460 | |
| 2461 | printk(KERN_INFO "%s: Initializing Radio.\n", |
| 2462 | strip_info->dev->name); |
| 2463 | ResetRadio(strip_info); |
| 2464 | strip_info->idle_timer.expires = jiffies + 1 * HZ; |
| 2465 | add_timer(&strip_info->idle_timer); |
| 2466 | netif_wake_queue(dev); |
| 2467 | return (0); |
| 2468 | } |
| 2469 | |
| 2470 | |
| 2471 | /* |
| 2472 | * Close the low-level part of the STRIP channel. Easy! |
| 2473 | */ |
| 2474 | |
| 2475 | static int strip_close_low(struct net_device *dev) |
| 2476 | { |
| 2477 | struct strip *strip_info = netdev_priv(dev); |
| 2478 | |
| 2479 | if (strip_info->tty == NULL) |
| 2480 | return -EBUSY; |
| 2481 | strip_info->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); |
| 2482 | |
| 2483 | netif_stop_queue(dev); |
| 2484 | |
| 2485 | /* |
| 2486 | * Free all STRIP frame buffers. |
| 2487 | */ |
Jesper Juhl | b4558ea | 2005-10-28 16:53:13 -0400 | [diff] [blame] | 2488 | kfree(strip_info->rx_buff); |
| 2489 | strip_info->rx_buff = NULL; |
| 2490 | kfree(strip_info->sx_buff); |
| 2491 | strip_info->sx_buff = NULL; |
| 2492 | kfree(strip_info->tx_buff); |
| 2493 | strip_info->tx_buff = NULL; |
| 2494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2495 | del_timer(&strip_info->idle_timer); |
| 2496 | return 0; |
| 2497 | } |
| 2498 | |
| 2499 | /* |
| 2500 | * This routine is called by DDI when the |
| 2501 | * (dynamically assigned) device is registered |
| 2502 | */ |
| 2503 | |
| 2504 | static void strip_dev_setup(struct net_device *dev) |
| 2505 | { |
| 2506 | /* |
| 2507 | * Finish setting up the DEVICE info. |
| 2508 | */ |
| 2509 | |
| 2510 | SET_MODULE_OWNER(dev); |
| 2511 | |
| 2512 | dev->trans_start = 0; |
| 2513 | dev->last_rx = 0; |
| 2514 | dev->tx_queue_len = 30; /* Drop after 30 frames queued */ |
| 2515 | |
| 2516 | dev->flags = 0; |
| 2517 | dev->mtu = DEFAULT_STRIP_MTU; |
| 2518 | dev->type = ARPHRD_METRICOM; /* dtang */ |
| 2519 | dev->hard_header_len = sizeof(STRIP_Header); |
| 2520 | /* |
| 2521 | * dev->priv Already holds a pointer to our struct strip |
| 2522 | */ |
| 2523 | |
| 2524 | *(MetricomAddress *) & dev->broadcast = broadcast_address; |
| 2525 | dev->dev_addr[0] = 0; |
| 2526 | dev->addr_len = sizeof(MetricomAddress); |
| 2527 | |
| 2528 | /* |
| 2529 | * Pointers to interface service routines. |
| 2530 | */ |
| 2531 | |
| 2532 | dev->open = strip_open_low; |
| 2533 | dev->stop = strip_close_low; |
| 2534 | dev->hard_start_xmit = strip_xmit; |
| 2535 | dev->hard_header = strip_header; |
| 2536 | dev->rebuild_header = strip_rebuild_header; |
| 2537 | dev->set_mac_address = strip_set_mac_address; |
| 2538 | dev->get_stats = strip_get_stats; |
| 2539 | dev->change_mtu = strip_change_mtu; |
| 2540 | } |
| 2541 | |
| 2542 | /* |
| 2543 | * Free a STRIP channel. |
| 2544 | */ |
| 2545 | |
| 2546 | static void strip_free(struct strip *strip_info) |
| 2547 | { |
| 2548 | spin_lock_bh(&strip_lock); |
| 2549 | list_del_rcu(&strip_info->list); |
| 2550 | spin_unlock_bh(&strip_lock); |
| 2551 | |
| 2552 | strip_info->magic = 0; |
| 2553 | |
| 2554 | free_netdev(strip_info->dev); |
| 2555 | } |
| 2556 | |
| 2557 | |
| 2558 | /* |
| 2559 | * Allocate a new free STRIP channel |
| 2560 | */ |
| 2561 | static struct strip *strip_alloc(void) |
| 2562 | { |
| 2563 | struct list_head *n; |
| 2564 | struct net_device *dev; |
| 2565 | struct strip *strip_info; |
| 2566 | |
| 2567 | dev = alloc_netdev(sizeof(struct strip), "st%d", |
| 2568 | strip_dev_setup); |
| 2569 | |
| 2570 | if (!dev) |
| 2571 | return NULL; /* If no more memory, return */ |
| 2572 | |
| 2573 | |
| 2574 | strip_info = dev->priv; |
| 2575 | strip_info->dev = dev; |
| 2576 | |
| 2577 | strip_info->magic = STRIP_MAGIC; |
| 2578 | strip_info->tty = NULL; |
| 2579 | |
| 2580 | strip_info->gratuitous_arp = jiffies + LongTime; |
| 2581 | strip_info->arp_interval = 0; |
| 2582 | init_timer(&strip_info->idle_timer); |
| 2583 | strip_info->idle_timer.data = (long) dev; |
| 2584 | strip_info->idle_timer.function = strip_IdleTask; |
| 2585 | |
| 2586 | |
| 2587 | spin_lock_bh(&strip_lock); |
| 2588 | rescan: |
| 2589 | /* |
| 2590 | * Search the list to find where to put our new entry |
| 2591 | * (and in the process decide what channel number it is |
| 2592 | * going to be) |
| 2593 | */ |
| 2594 | list_for_each(n, &strip_list) { |
| 2595 | struct strip *s = hlist_entry(n, struct strip, list); |
| 2596 | |
| 2597 | if (s->dev->base_addr == dev->base_addr) { |
| 2598 | ++dev->base_addr; |
| 2599 | goto rescan; |
| 2600 | } |
| 2601 | } |
| 2602 | |
| 2603 | sprintf(dev->name, "st%ld", dev->base_addr); |
| 2604 | |
| 2605 | list_add_tail_rcu(&strip_info->list, &strip_list); |
| 2606 | spin_unlock_bh(&strip_lock); |
| 2607 | |
| 2608 | return strip_info; |
| 2609 | } |
| 2610 | |
| 2611 | /* |
| 2612 | * Open the high-level part of the STRIP channel. |
| 2613 | * This function is called by the TTY module when the |
| 2614 | * STRIP line discipline is called for. Because we are |
| 2615 | * sure the tty line exists, we only have to link it to |
| 2616 | * a free STRIP channel... |
| 2617 | */ |
| 2618 | |
| 2619 | static int strip_open(struct tty_struct *tty) |
| 2620 | { |
| 2621 | struct strip *strip_info = (struct strip *) tty->disc_data; |
| 2622 | |
| 2623 | /* |
| 2624 | * First make sure we're not already connected. |
| 2625 | */ |
| 2626 | |
| 2627 | if (strip_info && strip_info->magic == STRIP_MAGIC) |
| 2628 | return -EEXIST; |
| 2629 | |
| 2630 | /* |
| 2631 | * OK. Find a free STRIP channel to use. |
| 2632 | */ |
| 2633 | if ((strip_info = strip_alloc()) == NULL) |
| 2634 | return -ENFILE; |
| 2635 | |
| 2636 | /* |
| 2637 | * Register our newly created device so it can be ifconfig'd |
| 2638 | * strip_dev_init() will be called as a side-effect |
| 2639 | */ |
| 2640 | |
| 2641 | if (register_netdev(strip_info->dev) != 0) { |
| 2642 | printk(KERN_ERR "strip: register_netdev() failed.\n"); |
| 2643 | strip_free(strip_info); |
| 2644 | return -ENFILE; |
| 2645 | } |
| 2646 | |
| 2647 | strip_info->tty = tty; |
| 2648 | tty->disc_data = strip_info; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 2649 | tty->receive_room = 65536; |
| 2650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | if (tty->driver->flush_buffer) |
| 2652 | tty->driver->flush_buffer(tty); |
| 2653 | |
| 2654 | /* |
| 2655 | * Restore default settings |
| 2656 | */ |
| 2657 | |
| 2658 | strip_info->dev->type = ARPHRD_METRICOM; /* dtang */ |
| 2659 | |
| 2660 | /* |
| 2661 | * Set tty options |
| 2662 | */ |
| 2663 | |
| 2664 | tty->termios->c_iflag |= IGNBRK | IGNPAR; /* Ignore breaks and parity errors. */ |
| 2665 | tty->termios->c_cflag |= CLOCAL; /* Ignore modem control signals. */ |
| 2666 | tty->termios->c_cflag &= ~HUPCL; /* Don't close on hup */ |
| 2667 | |
| 2668 | printk(KERN_INFO "STRIP: device \"%s\" activated\n", |
| 2669 | strip_info->dev->name); |
| 2670 | |
| 2671 | /* |
| 2672 | * Done. We have linked the TTY line to a channel. |
| 2673 | */ |
| 2674 | return (strip_info->dev->base_addr); |
| 2675 | } |
| 2676 | |
| 2677 | /* |
| 2678 | * Close down a STRIP channel. |
| 2679 | * This means flushing out any pending queues, and then restoring the |
| 2680 | * TTY line discipline to what it was before it got hooked to STRIP |
| 2681 | * (which usually is TTY again). |
| 2682 | */ |
| 2683 | |
| 2684 | static void strip_close(struct tty_struct *tty) |
| 2685 | { |
| 2686 | struct strip *strip_info = (struct strip *) tty->disc_data; |
| 2687 | |
| 2688 | /* |
| 2689 | * First make sure we're connected. |
| 2690 | */ |
| 2691 | |
| 2692 | if (!strip_info || strip_info->magic != STRIP_MAGIC) |
| 2693 | return; |
| 2694 | |
| 2695 | unregister_netdev(strip_info->dev); |
| 2696 | |
| 2697 | tty->disc_data = NULL; |
| 2698 | strip_info->tty = NULL; |
| 2699 | printk(KERN_INFO "STRIP: device \"%s\" closed down\n", |
| 2700 | strip_info->dev->name); |
| 2701 | strip_free(strip_info); |
| 2702 | tty->disc_data = NULL; |
| 2703 | } |
| 2704 | |
| 2705 | |
| 2706 | /************************************************************************/ |
| 2707 | /* Perform I/O control calls on an active STRIP channel. */ |
| 2708 | |
| 2709 | static int strip_ioctl(struct tty_struct *tty, struct file *file, |
| 2710 | unsigned int cmd, unsigned long arg) |
| 2711 | { |
| 2712 | struct strip *strip_info = (struct strip *) tty->disc_data; |
| 2713 | |
| 2714 | /* |
| 2715 | * First make sure we're connected. |
| 2716 | */ |
| 2717 | |
| 2718 | if (!strip_info || strip_info->magic != STRIP_MAGIC) |
| 2719 | return -EINVAL; |
| 2720 | |
| 2721 | switch (cmd) { |
| 2722 | case SIOCGIFNAME: |
| 2723 | if(copy_to_user((void __user *) arg, strip_info->dev->name, strlen(strip_info->dev->name) + 1)) |
| 2724 | return -EFAULT; |
| 2725 | break; |
| 2726 | case SIOCSIFHWADDR: |
| 2727 | { |
| 2728 | MetricomAddress addr; |
| 2729 | //printk(KERN_INFO "%s: SIOCSIFHWADDR\n", strip_info->dev->name); |
| 2730 | if(copy_from_user(&addr, (void __user *) arg, sizeof(MetricomAddress))) |
| 2731 | return -EFAULT; |
| 2732 | return set_mac_address(strip_info, &addr); |
| 2733 | } |
| 2734 | /* |
| 2735 | * Allow stty to read, but not set, the serial port |
| 2736 | */ |
| 2737 | |
| 2738 | case TCGETS: |
| 2739 | case TCGETA: |
| 2740 | return n_tty_ioctl(tty, file, cmd, arg); |
| 2741 | break; |
| 2742 | default: |
| 2743 | return -ENOIOCTLCMD; |
| 2744 | break; |
| 2745 | } |
| 2746 | return 0; |
| 2747 | } |
| 2748 | |
| 2749 | |
| 2750 | /************************************************************************/ |
| 2751 | /* Initialization */ |
| 2752 | |
| 2753 | static struct tty_ldisc strip_ldisc = { |
| 2754 | .magic = TTY_LDISC_MAGIC, |
| 2755 | .name = "strip", |
| 2756 | .owner = THIS_MODULE, |
| 2757 | .open = strip_open, |
| 2758 | .close = strip_close, |
| 2759 | .ioctl = strip_ioctl, |
| 2760 | .receive_buf = strip_receive_buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2761 | .write_wakeup = strip_write_some_more, |
| 2762 | }; |
| 2763 | |
| 2764 | /* |
| 2765 | * Initialize the STRIP driver. |
| 2766 | * This routine is called at boot time, to bootstrap the multi-channel |
| 2767 | * STRIP driver |
| 2768 | */ |
| 2769 | |
| 2770 | static char signon[] __initdata = |
| 2771 | KERN_INFO "STRIP: Version %s (unlimited channels)\n"; |
| 2772 | |
| 2773 | static int __init strip_init_driver(void) |
| 2774 | { |
| 2775 | int status; |
| 2776 | |
| 2777 | printk(signon, StripVersion); |
| 2778 | |
| 2779 | |
| 2780 | /* |
| 2781 | * Fill in our line protocol discipline, and register it |
| 2782 | */ |
| 2783 | if ((status = tty_register_ldisc(N_STRIP, &strip_ldisc))) |
| 2784 | printk(KERN_ERR "STRIP: can't register line discipline (err = %d)\n", |
| 2785 | status); |
| 2786 | |
| 2787 | /* |
| 2788 | * Register the status file with /proc |
| 2789 | */ |
| 2790 | proc_net_fops_create("strip", S_IFREG | S_IRUGO, &strip_seq_fops); |
| 2791 | |
| 2792 | return status; |
| 2793 | } |
| 2794 | |
| 2795 | module_init(strip_init_driver); |
| 2796 | |
| 2797 | static const char signoff[] __exitdata = |
| 2798 | KERN_INFO "STRIP: Module Unloaded\n"; |
| 2799 | |
| 2800 | static void __exit strip_exit_driver(void) |
| 2801 | { |
| 2802 | int i; |
| 2803 | struct list_head *p,*n; |
| 2804 | |
| 2805 | /* module ref count rules assure that all entries are unregistered */ |
| 2806 | list_for_each_safe(p, n, &strip_list) { |
| 2807 | struct strip *s = list_entry(p, struct strip, list); |
| 2808 | strip_free(s); |
| 2809 | } |
| 2810 | |
| 2811 | /* Unregister with the /proc/net file here. */ |
| 2812 | proc_net_remove("strip"); |
| 2813 | |
Alexey Dobriyan | 64ccd71 | 2005-06-23 00:10:33 -0700 | [diff] [blame] | 2814 | if ((i = tty_unregister_ldisc(N_STRIP))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | printk(KERN_ERR "STRIP: can't unregister line discipline (err = %d)\n", i); |
| 2816 | |
| 2817 | printk(signoff); |
| 2818 | } |
| 2819 | |
| 2820 | module_exit(strip_exit_driver); |
| 2821 | |
| 2822 | MODULE_AUTHOR("Stuart Cheshire <cheshire@cs.stanford.edu>"); |
| 2823 | MODULE_DESCRIPTION("Starmode Radio IP (STRIP) Device Driver"); |
| 2824 | MODULE_LICENSE("Dual BSD/GPL"); |
| 2825 | |
| 2826 | MODULE_SUPPORTED_DEVICE("Starmode Radio IP (STRIP) modem"); |